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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
@ 2019-05-01 20:33 ` chewi at gentoo dot org
2020-09-17 21:42 ` tg at mirbsd dot de
` (20 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: chewi at gentoo dot org @ 2019-05-01 20:33 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
James Le Cuirot <chewi at gentoo dot org> changed:
What |Removed |Added
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CC| |chewi at gentoo dot org
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>From glibc-bugs-return-45374-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 11:45:56 2019
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug dynamic-link/24506] FAIL: elf/tst-pldd with --enable-hardcoded-path-in-tests
Date: Thu, 02 May 2019 11:45:00 -0000
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Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
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--- Comment #12 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed by b2af6fb2ed23930c148bae382ca85fad4d1cf32e.
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>From glibc-bugs-return-45375-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 11:52:15 2019
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Subject: [Bug malloc/24216] Check for large bin list corruption when inserting unsorted chunk
Date: Thu, 02 May 2019 11:52:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24216
--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.29/master branch has been updated by Arjun Shankar
<arjun@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=52b7cd6e9a701bb203023d56e84551943dc6a4c0
commit 52b7cd6e9a701bb203023d56e84551943dc6a4c0
Author: Adam Maris <amaris@redhat.com>
Date: Thu Mar 14 16:51:16 2019 -0400
malloc: Check for large bin list corruption when inserting unsorted chunk
Fixes bug 24216. This patch adds security checks for bk and bk_nextsize
pointers
of chunks in large bin when inserting chunk from unsorted bin. It was
possible
to write the pointer to victim (newly inserted chunk) to arbitrary memory
locations if bk or bk_nextsize pointers of the next large bin chunk
got corrupted.
(cherry picked from commit 5b06f538c5aee0389ed034f60d90a8884d6d54de)
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>From glibc-bugs-return-45376-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 12:25:20 2019
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From: "schwab@linux-m68k.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Thu, 02 May 2019 12:25:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24484
Andreas Schwab <schwab@linux-m68k.org> changed:
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--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
I think this needs to be reverted, and this bug should be closed as WONTFIX.
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>From glibc-bugs-return-45377-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 12:29:59 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Thu, 02 May 2019 12:29:00 -0000
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--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Andreas Schwab from comment #2)
> Isn't that an ABI break?
Would you please explain the nature of the ABI break? Thanks.
Do you expect tools to get confused because the dynamic section is now
relocated at run time?
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>From glibc-bugs-return-45378-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 12:37:42 2019
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Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Thu, 02 May 2019 12:37:00 -0000
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--- Comment #5 from Andreas Schwab <schwab@linux-m68k.org> ---
It breaks libphobos in gcc 9.
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>From glibc-bugs-return-45379-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 12:40:32 2019
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Subject: [Bug malloc/24216] Check for large bin list corruption when inserting unsorted chunk
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https://sourceware.org/bugzilla/show_bug.cgi?id=24216
--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.28/master branch has been updated by Arjun Shankar
<arjun@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4a5e58827f2b6efa94ea50a9db5f3c861173837f
commit 4a5e58827f2b6efa94ea50a9db5f3c861173837f
Author: Adam Maris <amaris@redhat.com>
Date: Thu Mar 14 16:51:16 2019 -0400
malloc: Check for large bin list corruption when inserting unsorted chunk
Fixes bug 24216. This patch adds security checks for bk and bk_nextsize
pointers
of chunks in large bin when inserting chunk from unsorted bin. It was
possible
to write the pointer to victim (newly inserted chunk) to arbitrary memory
locations if bk or bk_nextsize pointers of the next large bin chunk
got corrupted.
(cherry picked from commit 5b06f538c5aee0389ed034f60d90a8884d6d54de)
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>From glibc-bugs-return-45380-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 12:48:49 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Thu, 02 May 2019 12:48:00 -0000
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--- Comment #6 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Andreas Schwab from comment #5)
> It breaks libphobos in gcc 9.
In which way? Does it try to parse the dynamic section?
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>From glibc-bugs-return-45381-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 12:54:11 2019
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To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Thu, 02 May 2019 12:54:00 -0000
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--- Comment #7 from Florian Weimer <fweimer at redhat dot com> ---
Looks like this is expected to change, from
libphobos/libdruntime/gcc/sections/elf_shared.d:
version (CRuntime_Musl)
strtab = cast(const(char)*)(info.dlpi_addr + dyn.d_un.d_ptr); // relocate
else version (linux)
{
// This might change in future glibc releases (after 2.29) as dynamic
sections
// are not required to be read-only on RISC-V. This was copy & pasted
from MIPS
// while upstreaming RISC-V support. Otherwise MIPS is the only arch
which sets
// in glibc: #define DL_RO_DYN_SECTION 1
version (RISCV_Any)
strtab = cast(const(char)*)(info.dlpi_addr + dyn.d_un.d_ptr); //
relocate
else
strtab = cast(const(char)*)dyn.d_un.d_ptr;
}
Looks like this code needs fixing on MIPS, too.
Is there an easy way to detect whether the dynamic segment has been relocated?
Then we should just at the check to libphobos.
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>From glibc-bugs-return-45382-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 13:11:30 2019
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Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Thu, 02 May 2019 13:11:00 -0000
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--- Comment #8 from Andreas Schwab <schwab@linux-m68k.org> ---
You cannot change it, the ship has sailed.
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>From glibc-bugs-return-45383-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 13:55:35 2019
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From: "glaubitz at physik dot fu-berlin.de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
Date: Thu, 02 May 2019 13:55:00 -0000
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--- Comment #45 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to John Paul Adrian Glaubitz from comment #44)
> I have already tried building qtchooser with -D_LARGEFILE64_SOURCE
> -D_LARGEFILE_SOURCE, but that didn't help so far.
>
> Source of qtchoser is here: https://code.qt.io/cgit/qtsdk/qtchooser.git/
Okay, if anyone is reading this. Building qtchooser with -D_FILE_OFFSET_BITS=64
fixes the problem for me.
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>From glibc-bugs-return-45384-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 13:58:27 2019
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
Date: Thu, 02 May 2019 13:58:00 -0000
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--- Comment #46 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
I think maybe an option would to just avoid to return EOVERFLOW, as Joseph has
a suggestion in comment #22, and make it clear in documentation the pitfalls
about using getdents in non-LFS mode for scenarios (as Florian described).
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>From glibc-bugs-return-45385-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 02 21:32:36 2019
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Subject: [Bug locale/2872] Transliteration Cyrillic -> ASCII fails
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Egor Kobylkin <egor at kobylkin dot com> changed:
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--- Comment #59 from Egor Kobylkin <egor at kobylkin dot com> ---
Added as release blocker for 2.30 on suggestion of Siddhesh Poyarekar
https://sourceware.org/ml/libc-alpha/2019-04/msg00566.html
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>From glibc-bugs-return-45386-listarch-glibc-bugs=sources.redhat.com@sourceware.org Fri May 03 07:41:23 2019
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Subject: [Bug libc/14176] mblen is erroneously marked warn_unused_result
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>From glibc-bugs-return-45388-listarch-glibc-bugs=sources.redhat.com@sourceware.org Fri May 03 07:47:06 2019
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Subject: [Bug libc/14176] mblen is erroneously marked warn_unused_result
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| |illa/show_bug.cgi?id=24512
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>From glibc-bugs-return-45387-listarch-glibc-bugs=sources.redhat.com@sourceware.org Fri May 03 07:47:06 2019
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Subject: [Bug string/24512] New: Implement current ISO C mblen
Date: Fri, 03 May 2019 07:47:00 -0000
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Bug ID: 24512
Summary: Implement current ISO C mblen
Product: glibc
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ISO C changed the behavior of mblen. It is not required to reset the
conversion state at the beginning of each call, like this:
mbtowc((wchar_t *)0, (const char *)0, 0);
mbtowc((wchar_t *)0, s, n);
Older C standards left out the first call to mbtowc, not resetting the state.
POSIX still appears to require the old behavior, but it is expected that it
eventually adopts the current ISO C behavior due to future synchronization.
The new ISO C version will be thread safe, so it is a net improvement. It
should also be marked warn_unused_result again (bug 14176).
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>From glibc-bugs-return-45389-listarch-glibc-bugs=sources.redhat.com@sourceware.org Fri May 03 16:07:43 2019
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Subject: [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
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--- Comment #47 from dflogeras2 at gmail dot com ---
I'd gladly help testing this patch. Those of us Gentoo ARM enthusiasts that
use qemu to build packages have hit this issue as well. I agree, it would be
better if Qemu/kernel properly handled these cases, but until they do it might
be easier to revert back to previous incorrect behaviour.
I've noticed more than just Dash, but also shared-mime-info, as well as
Gentoo's libsandbox affected by this. The latter wasn't as simple as enabling
LFS since it is a syscall wrapper itself. It actually had to be patched where
it uses readdir() internally with _FILE_OFFSET_BITS=64.
It's not the packages I now know about that scare me, it's the potentially
dozens of unknowns that will mysteriously not work as intended because (again,
not glibc fault) no one bothered to check the return errno and catch the error
at the very least.
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>From glibc-bugs-return-45390-listarch-glibc-bugs=sources.redhat.com@sourceware.org Sun May 05 07:10:10 2019
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Subject: [Bug dynamic-link/24525] New: asan report memleak in add_dependency called by _dl_lookup_symbol_x
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https://sourceware.org/bugzilla/show_bug.cgi?id=24525
Bug ID: 24525
Summary: asan report memleak in add_dependency called by
_dl_lookup_symbol_x
Product: glibc
Version: 2.27
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: dynamic-link
Assignee: unassigned at sourceware dot org
Reporter: wangbing6 at huawei dot com
Target Milestone: ---
asan report memleak in add_dependency called by __dl_lookup_symbol_x:
==== callStack : Direct leak of 88 byte(s) in 1 object(s) allocated (1 objects)
from:
#0 0x7f77ba52ef in __interceptor_malloc
/usr1/code/gcc_asan_build/gcc-5.3.0/libsanitizer/asan/asan_malloc_linux.cc:62
#1 0x5574e380a7 in malloc (+0x1f0a7)
#2 0x7f7905129b in _dl_lookup_symbol_x (/lib64/ld-linux-aarch64.so.1+0xa29b)
#3 0x7f779b3cdb in do_sym (/lib64/libc.so.6+0x112cdb)
#4 0x7f77acd1ab in dlsym_doit (/lib64/libdl.so.2+0x11ab)
#5 0x7f779b4273 in _dl_catch_exception (/lib64/libc.so.6+0x113273)
#6 0x7f779b431f in __GI__dl_catch_error (/lib64/libc.so.6+0x11331f)
#7 0x7f77acd80f in _dlerror_run (/lib64/libdl.so.2+0x180f)
#8 0x7f77acd233 in dlsym (/lib64/libdl.so.2+0x1233)
and check the glibc source: _dl_lookup_symbol_x called add_dependency:
elf/dl-lookup.c Line:900
/* We have to check whether this would bind UNDEF_MAP to an object
in the global scope which was dynamically loaded. In this case
we have to prevent the latter from being unloaded unless the
UNDEF_MAP object is also unloaded. */
if (__glibc_unlikely (current_value.m->l_type == lt_loaded)
/* Don't do this for explicit lookups as opposed to implicit
runtime lookups. */
&& (flags & DL_LOOKUP_ADD_DEPENDENCY) != 0
/* Add UNDEF_MAP to the dependencies. */
&& add_dependency (undef_map, current_value.m, flags) < 0)
/* Something went wrong. Perhaps the object we tried to reference
was just removed. Try finding another definition. */
return _dl_lookup_symbol_x (undef_name, undef_map, ref,
(flags & DL_LOOKUP_GSCOPE_LOCK)
? undef_map->l_scope : symbol_scope,
version, type_class, flags, skip_map);
/* The object is used. */
if (__glibc_unlikely (current_value.m->l_used == 0))
current_value.m->l_used = 1;
if (__glibc_unlikely (GLRO(dl_debug_mask)
& (DL_DEBUG_BINDINGS|DL_DEBUG_PRELINK)))
_dl_debug_bindings (undef_name, undef_map, ref,
¤t_value, version, type_class, protected);
and add_dependency called malloc in elf/dl-lookup.c Line：711， without freeing
newp：
/* Add the reference now. */
if (__glibc_unlikely (l_reldepsact >= undef_map->l_reldepsmax))
{
/* Allocate more memory for the dependency list. Since this
can never happen during the startup phase we can use
`realloc'. */
struct link_map_reldeps *newp;
unsigned int max
= undef_map->l_reldepsmax ? undef_map->l_reldepsmax * 2 : 10;
#ifdef RTLD_PREPARE_FOREIGN_CALL
RTLD_PREPARE_FOREIGN_CALL;
#endif
newp = malloc (sizeof (*newp) + max * sizeof (struct link_map *));
if (newp == NULL)
{
/* If we didn't manage to allocate memory for the list this is
no fatal problem. We simply make sure the referenced object
cannot be unloaded. This is semantically the correct
behavior. */
map->l_flags_1 |= DF_1_NODELETE;
goto out;
}
else
{
if (l_reldepsact)
memcpy (&newp->list[0], &undef_map->l_reldeps->list[0],
l_reldepsact * sizeof (struct link_map *));
newp->list[l_reldepsact] = map;
newp->act = l_reldepsact + 1;
atomic_write_barrier ();
void *old = undef_map->l_reldeps;
undef_map->l_reldeps = newp;
undef_map->l_reldepsmax = max;
if (old)
_dl_scope_free (old);
}
}
else
{
undef_map->l_reldeps->list[l_reldepsact] = map;
atomic_write_barrier ();
undef_map->l_reldeps->act = l_reldepsact + 1;
}
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>From glibc-bugs-return-45391-listarch-glibc-bugs=sources.redhat.com@sourceware.org Sun May 05 07:30:34 2019
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To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24525] asan report memleak in add_dependency called by _dl_lookup_symbol_x
Date: Sun, 05 May 2019 07:30:00 -0000
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wangbing <wangbing6 at huawei dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wangbing6 at huawei dot com
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>From glibc-bugs-return-45392-listarch-glibc-bugs=sources.redhat.com@sourceware.org Sun May 05 22:33:58 2019
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To: glibc-bugs@sourceware.org
Subject: [Bug math/24207] [powerpc] Enable sincos/sincosf in libmvec vector math library on POWER VSX
Date: Sun, 05 May 2019 22:33:00 -0000
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Shawn Landden <slandden at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Shawn Landden <slandden at gmail dot com> ---
I found this branch and will modify my patch to conform.
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>From glibc-bugs-return-45393-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 06 10:15:39 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/16181] Threade-safe implementation of innetgr and definition of struct __netgrent
Date: Mon, 06 May 2019 10:15:00 -0000
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Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|innetgr is likely to miss |Threade-safe implementation
|entries in nscd and other |of innetgr and definition
|multi-thread contexts |of struct __netgrent
--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
The glibc NSS modules avoid this issue by using the struct __netgrent *
argument to store state. The interface requires that the struct is zeroed by
the NSS framework, and initialization only happens in the NSS module if certain
values are not zero.
The main issue here is that the type struct __netgrent is private. If this was
a public interface, an application could use that to store state information
across setnetgrent/getnetgrent_r/endnetgrent, just like the internal NSS
modules do.
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>From glibc-bugs-return-45394-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 06 17:10:53 2019
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From: "hd@os-cillation.de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/24529] New: Static linking issue with getcontext/setcontext and PIC on ARM
Date: Mon, 06 May 2019 17:10:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24529
Bug ID: 24529
Summary: Static linking issue with getcontext/setcontext and
PIC on ARM
Product: glibc
Version: 2.29
Status: UNCONFIRMED
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Priority: P2
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Reporter: hd@os-cillation.de
CC: carlos at redhat dot com
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Hello,
we observe the following issue statically linking in libc.a:
/usr/sbin/ld:
/usr/lib/gcc/armv7l-unknown-linux-gnueabihf/8.3.0/../../../libc.a(getcontext.o):
in function `getcontext':
(.text+0x88): undefined reference to `_rtld_global_ro'
/usr/sbin/ld:
/usr/lib/gcc/armv7l-unknown-linux-gnueabihf/8.3.0/../../../libc.a(setcontext.o):
in function `__startcontext':
(.text+0x80): undefined reference to `_rtld_global_ro'
This seems to be due our static pie enabled toolchain and ifdef PIC vs SHARED
confusion in
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/arm/getcontext.S;h=e072c30fc7a64ffe723bbae52f6eb2736d999bd5;hb=HEAD#l53
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/arm/getcontext.S;h=e072c30fc7a64ffe723bbae52f6eb2736d999bd5;hb=HEAD#l105
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/arm/setcontext.S;h=3381b9486126d5492ddbddf79b599b35aab16eb3;hb=HEAD#l35
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/arm/setcontext.S;h=3381b9486126d5492ddbddf79b599b35aab16eb3;hb=HEAD#l104
I guess that needs to be fixed like in
https://sourceware.org/git/?p=glibc.git;a=commit;h=3ee578690f35942f41926cc2d98e25b3d0d08c71
?
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>From glibc-bugs-return-45395-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 06 18:21:10 2019
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From: "palmer at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Mon, 06 May 2019 18:21:00 -0000
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--- Comment #9 from Palmer Dabbelt <palmer at gcc dot gnu.org> ---
Sorry, I'm still a bit confused about this being an ABI break. If the ABI
doesn't require these sections to be read-only then isn't this an
implementation bug in glibc as opposed to an ABI break? If I understand
correctly we were already producing these read-write sections in binutils, so
it's really a difference between binutils and glibc -- either we change
binutils and the ABI document to match what glibc is doing, or we change glibc
to match what binutils and the ABI document say. In this case I'd prefer to
have the glibc change, as it seems like the more normal direction.
Am I misunderstanding something?
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>From glibc-bugs-return-45396-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 06 18:37:55 2019
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From: "carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug locale/24442] FAIL: iconv/test-iconvconfig
Date: Mon, 06 May 2019 18:37:00 -0000
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--- Comment #7 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Andreas Schwab from comment #6)
> I think the point of the test is to check that gconv-modules.cache stays
> binary compatible.
I take back what I said earlier, this test is always going to fail here, I
agree with Florian.
The intent of the test is to check for binary compatibility, but that's not
what is actually being tested for here. Instead we are checking to see if the
result is binary identical, and that's not the same. This test is therefore
susceptable to spurious failures (like this one) *but* it will catch issues
where we make mistakes, and so should stay, but for now the result of the test
is basically wrong until your system is rebuilt with the latest change.
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>From glibc-bugs-return-45397-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 06 18:39:11 2019
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From: "carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug locale/24442] RFE: Make iconv/test-iconvconfig test gconv module ABI.
Date: Mon, 06 May 2019 18:39:00 -0000
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Carlos O'Donell <carlos at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|FAIL: |RFE: Make
|iconv/test-iconvconfig |iconv/test-iconvconfig test
| |gconv module ABI.
--- Comment #8 from Carlos O'Donell <carlos at redhat dot com> ---
Retitling this as an RFE.
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>From glibc-bugs-return-45398-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 06 18:43:39 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Mon, 06 May 2019 18:43:00 -0000
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--- Comment #10 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Palmer Dabbelt from comment #9)
> Sorry, I'm still a bit confused about this being an ABI break. If the ABI
> doesn't require these sections to be read-only then isn't this an
> implementation bug in glibc as opposed to an ABI break?
If the dynamic segment isn't read-only, glibc relocates it, so the address
values contained in it change. I think this is the nature of the ABI break,
not the read-write vs read-only status as such.
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>From glibc-bugs-return-45399-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 07 09:41:26 2019
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From: "superherowolverine-sourcewareorg at yahoo dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug localedata/14085] en_NL: new locale (English language for the Netherlands)
Date: Tue, 07 May 2019 09:41:00 -0000
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--- Comment #15 from Robertino <superherowolverine-sourcewareorg at yahoo dot com> ---
https://sourceware.org/bugzilla/show_bug.cgi?id=12624#c3 :
QUOTE
Accepting any such special-interest locale would open a flood. There is no
reason to have such a locale in glibc. The localedef utility is standardized
for a reason: locales can be compiled by anyone.
Just create a RPM or whatever which upon installation installs the files and
compiles the locale with localedef.
UNQUOTE
Adding "en_non-en" locales is not flooding.
Let's see what flooding is.
Somehow some people seem to forget that the EU (as we know it now) is a reality
since 1993. There are 24 official languages of the European Union. And 19 EU
member states. There is an internal single market in the EU where by law all
member states have agreed to act as one. Also, EU policies further the free
movement of **people**, goods, services and capital within this internal
market. Yes also people.
Has/Is anyone In The Netherlands working for a company that has Linux desktop
computers in their network and employs English speaking permies or English
speaking freelancers using those Linux computers?
And where more often than not one of the job requirements for native Dutch
speakers is : good (or better) written and spoken English. Because of the mix
of nationalities within the company. We are the USE (United States of Europe)
after all.
Has/Is anyone working for one of the many Japanese companies in The
Netherlands, where speaking and writing English is mandatory?
Has/Is anyone working for a company where Windows sysadmins keep Linux desktops
and laptops off their network and out the door because of locale issues?
Although staff would prefer to use Linux on the dersktop.
Some of the companies in The Netherlands that I worked as a freelance
contractor that had and still have many English speaking freelancers/permies :
ING Bank, ABN AMRO Bank, RABO Bank, MUFG Bank (nee Bank of Tokyo Mitsubishi
UFJ), Canon Europe BV, Kyocera Mita Europe, Cygnific BV (Air France-KLM's
worldwide support), XS4ALL BV (best ISP ever). They all refuse Linux desktops
for this locale issue.
ING Bank encountered major issues after they decided to build their new call
center software on Linux (server and desktop). As you guess the issues were
about locales on the desktop. Yes, they had to roll their own locales. I'm
still grateful that I did not work on that mope and grope project. That was in
late 2008.
You expect us to keep rinsing and repeating the ING effort almost 11 years
later? Almost 26 years after the beginning of the EU ?
Thanks for adding the Euro-sign though. It shaved 2 seconds off the work to
create a new locale. Hail Windows and Hail MacOS for putting in a genuinine
effort to conquer the desktop. Doh! Oops!
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>From glibc-bugs-return-45400-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 07 09:46:49 2019
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Subject: [Bug string/24512] Implement current ISO C mblen
Date: Tue, 07 May 2019 09:46:00 -0000
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>From glibc-bugs-return-45401-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 07 13:36:18 2019
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Subject: [Bug malloc/24531] New: Malloc tunables give tcache assertion failures
Date: Tue, 07 May 2019 13:36:00 -0000
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Bug ID: 24531
Summary: Malloc tunables give tcache assertion failures
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There is no range check when setting
GLIBC_TUNABLES=glibc.malloc.tcache_count=N. Given the tcache->counts[] array
uses a char and there are no overflow checks on this array, the count can wrap
around and cause assertion failures. Eg.
export GLIBC_TUNABLES=glibc.malloc.tcache_count=4096
make bench
...
Running /build/glibc/benchtests/bench-strcoll
bench-strcoll: malloc.c:2949: tcache_get: Assertion `tcache->counts[tc_idx] >
0' failed.
Aborted
So the range of the tunable must be limited to the maximum range of the tcache
counts array, which would be 127 for a char.
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>From glibc-bugs-return-45402-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 07 17:30:30 2019
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Subject: [Bug malloc/14581] memalign allocations are often not reused after free
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--- Comment #15 from Mika Fischer <mika.fischer at zoopnet dot de> ---
Created attachment 11763
--> https://sourceware.org/bugzilla/attachment.cgi?id=11763&action=edit
Example case for image processing use-case
We hit this issue (or at least I assume it is this issue) in production.
Our use-case is that we have a loop with:
- two large aligned allocations (large temporary images)
- followed by a small unaligned allocation (the result)
- the large allocations are freed, the small result is kept
For some sizes (see attached program) this leads to glibc never freeing any
memory! The attached program demonstrates the issue. It runs out of memory in
seconds...
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>From glibc-bugs-return-45403-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 07 21:43:27 2019
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Subject: [Bug libc/24532] New: conform/arpa/inet.h failures due to linux kernel 64-bit time_t changes
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Bug ID: 24532
Summary: conform/arpa/inet.h failures due to linux kernel
64-bit time_t changes
Product: glibc
Version: 2.30
Status: NEW
Severity: normal
Priority: P2
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As part of the 64-bit time_t y2038 changes, the linux kernel modified
asm-generic/socket.h to include linux/posix_types.h.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/include/uapi/asm-generic/socket.h?h=v5.1&id=a623a7a1a5670c25a16881f5078072d272d96b71
Unfortunately, linux/posix_types.h defines a structure with a field called
fds_bits. It also includes asm-generic/posix_types.h which defines a structure
with a field called val. The existence of these two structure fields is
causing me to see conform failures.
In the make check output I see
FAIL: conform/POSIX2008/arpa/inet.h/conform
FAIL: conform/POSIX2008/netdb.h/conform
FAIL: conform/POSIX2008/netinet/in.h/conform
FAIL: conform/POSIX2008/sys/socket.h/conform
which then repeats for four other standard versions for a total of 20 failures.
In conform/POSIX2008/arpa/inet.h/conform.out I see
Namespace violation: "fds_bits"
Namespace violation: "val"
FAIL: Namespace of <arpa/inet.h>
and similarly for the other header files.
I'm seeing these failures on a RISC-V Fedora Core 30 system, with 5.1.0 linux
kernel headers, building top of tree glibc sources, and running make check.
Maybe this is actually a linux kernel bug, but it is glibc make check that is
broken, so I thought I would start here. I don't know how these linux/glibc
interaction problems are dealt with normally.
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Subject: [Bug libc/24532] conform/arpa/inet.h failures due to linux kernel 64-bit time_t changes
Date: Tue, 07 May 2019 22:55:00 -0000
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--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I just chased this up on linux-api as a patch was posted there on 19 March
but somehow failed to get into the 5.1 release.
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>From glibc-bugs-return-45405-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 08 04:38:31 2019
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From: "carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug malloc/14581] memalign allocations are often not reused after free
Date: Wed, 08 May 2019 04:38:00 -0000
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--- Comment #16 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Mika Fischer from comment #15)
> Created attachment 11763 [details]
> Example case for image processing use-case
>
> We hit this issue (or at least I assume it is this issue) in production.
>
> Our use-case is that we have a loop with:
> - two large aligned allocations (large temporary images)
> - followed by a small unaligned allocation (the result)
> - the large allocations are freed, the small result is kept
>
> For some sizes (see attached program) this leads to glibc never freeing any
> memory! The attached program demonstrates the issue. It runs out of memory
> in seconds...
Yes, it's the same case.
In your example the 16MiB aligned block needs worst case 16MiB + alignment +
MIN_SIZE, but memalign, after getting back that block, will split the leader
and header from the block and reuse them. If a long-lived allocation takes one
of leader/remainder blocks then we can no longer find enough space on a
subsequent memalign to reallocate the 16MiB + alignment + MIN_SIZE block, and
we end up having to extend the heap again by 16MiB + alignment + MIN_SIZE. This
continues every iteration, growing the heap by sizes which are just shy of the
needed space.
Your only workaround is the usual trick:
GLIBC_TUNABLES=glibc.malloc.mmap_threshold=10485760 strace -ff -ttt -o
loop2.log ./memalign-loop
Which avoids the dynamic thresholding which is moving the allocation from mmap
to the brk heap.
Looking over the code again, I think the problem is really this:
4698 /* Call malloc with worst case padding to hit alignment. */
4699
4700 m = (char *) (_int_malloc (av, nb + alignment + MINSIZE));
4701
We need to avoid this pessimistic allocation and scan the bins ourselves
looking for a suitably aligned allocation. It's there, and ready to be used,
but not if we lazily use _int_malloc instead of scanning the bins ourself
first. I think such a scan will yield the best results overall and be straight
forward to implement.
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>From glibc-bugs-return-45406-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 08 05:40:49 2019
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Subject: [Bug localedata/24535] New: Update locale data to Unicode 12.1.0
Date: Wed, 08 May 2019 05:40:00 -0000
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Bug ID: 24535
Summary: Update locale data to Unicode 12.1.0
Product: glibc
Version: 2.31
Status: NEW
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Priority: P2
Component: localedata
Assignee: unassigned at sourceware dot org
Reporter: maiku.fabian at gmail dot com
CC: libc-locales at sourceware dot org
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Now that Unicode 12.1.0 is released, the locale data that was updated for
Unicode 12.0.0 (bug 24307) should be updated to 12.1.0
http://blog.unicode.org/2019/05/unicode-12-1-en.html
https://www.unicode.org/Public/12.1.0/ucd/
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Subject: [Bug localedata/24535] Update locale data to Unicode 12.1.0
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Subject: [Bug localedata/24535] Update locale data to Unicode 12.1.0
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>From glibc-bugs-return-45409-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 08 09:57:46 2019
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Subject: [Bug localedata/24535] Update locale data to Unicode 12.1.0
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--- Comment #1 from Mike FABIAN <maiku.fabian at gmail dot com> ---
Created attachment 11766
--> https://sourceware.org/bugzilla/attachment.cgi?id=11766&action=edit
0001-Bug-24535-Update-to-Unicode-12.1.0.patch
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>From glibc-bugs-return-45410-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 08 12:41:15 2019
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Subject: [Bug manual/24512] Document mblen divergence from C11/C17
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Florian Weimer <fweimer at redhat dot com> changed:
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CC| |mtk.manpages at gmail dot com
Component|string |manual
Summary|Implement current ISO C |Document mblen divergence
|mblen |from C11/C17
--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
This is a bug in the C11 and C17 standards. If implemented as indicated, mblen
will be useless with state-dependent encodings.
If we want a thread-safe version of mblen, we should consider another approach.
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https://sourceware.org/bugzilla/show_bug.cgi?id=24537
Bug ID: 24537
Summary: nptl/tst-eintr1 test case can hit task limits on some
kernels and break testing
Product: glibc
Version: 2.28
Status: NEW
Severity: normal
Priority: P2
Component: build
Assignee: unassigned at sourceware dot org
Reporter: nsz at gcc dot gnu.org
CC: carlos at redhat dot com
Target Milestone: ---
linux does not account the number of running tasks reliably
https://bugzilla.kernel.org/show_bug.cgi?id=154011
this can cause the nptl/tst-eintr1 test to hit task limits
set for the session or process, symptoms in the build logs:
/bin/sh: 2: Cannot fork
or
make[2]: fork: Resource temporarily unavailable
or in kernel logs:
cgroup: fork rejected by pids controller in /user.slice/user-1002.slice
and /sys/fs/cgroup/pids/user.slice/user-1002.slice/pids.events != 0
increasing the cgroup task limit sometimes helps
systemctl set-property user-1002.slice TasksMax=20000
or
echo 20000 >/sys/fs/cgroup/pids/user.slice/user-1002.slice/pids.max
but does not fix the problem: the futex wait in
pthread_join returns before the kernel decrements
the task counter so a pthread_create/join loop
can keep increasing the task counter and hit the
task limit eventually.
this has been seen at least on a linux 4.6 fedora
system and linux 4.15 aarch64 ubuntu system.
on a correct kernel the test should succeed with
task limit set to 25.
this can cause "make check" to fail early since
make cannot fork.
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>From glibc-bugs-return-45413-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 08 17:47:51 2019
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From: "wilson at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/24532] conform/arpa/inet.h failures due to linux kernel 64-bit time_t changes
Date: Wed, 08 May 2019 17:47:00 -0000
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--- Comment #2 from Jim Wilson <wilson at gcc dot gnu.org> ---
Thanks for the pointer to the linux-api mailing list. I found the patch
discussion there. That patch should fix my problem. I also downloaded a
linux-5.1 tarball and double checked, I don't see the patch there.
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>From glibc-bugs-return-45414-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 08 18:10:16 2019
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From: "wilson at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24484] RISC-V libraries can have read-write .dynamic sections, but ld.so loads them as read-only
Date: Wed, 08 May 2019 18:10:00 -0000
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Jim Wilson <wilson at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wilson at gcc dot gnu.org
--- Comment #11 from Jim Wilson <wilson at gcc dot gnu.org> ---
The problem here is that the D language runtime library libphobos has some code
identical to the D_PTR macro in sysdeps/generic/ldsodefs.h which depends on the
value of DL_RO_DYN_SECTION. This is a static compile time check in the
libphobos code. So changing the value of DL_RO_DYN_SECTION breaks the D
language support. We can make the same change to libphobos, but that leaves us
in the situation where a new libphobos won't work with an old glibc, and an old
libphobos won't work with a new glibc. That is the ABI break.
There is no RISC-V D language support before the gcc-9.1.0 release, which
happened about a week ago, so we have some time to fix this if we are quick.
We can just say that RISC-V D isn't supported in 9.1 and requires 9.2 for
instance. This can be fixed if libphobos is changed to use a dynamic run-time
check for the DL_RO_DYN_SECTION value. But this looks complicated. We can't
use DL_RO_DYN_SECTION or D_PTR because those are glibc internal macros, and you
can't include a C language header file in a D language source file anyways.
The code in elf_get_dynamic_info() in elf/get-dynamic-info.h that uses
DL_RO_DYN_SECTION doesn't set any flags to indicate whether it did anything or
not. So there doesn't seem to be anything we can easily check there. We have
the phdrs, but the dynamic section was already read/write from the beginning,
so that doesn't help. It seems that we need to add a new feature to glibc so
that the application can query whether the target has DL_RO_DYN_SECTION set or
not, which is returned via a function not a macro because we can't use C header
files, and then modify libphobos to use the new feature, in a failsafe way,
e.g. if the feature doesn't exist then we use the old scheme where MIPS and
RISC-V have DL_RO_DYN_SECTION set, and if the feature exists, then we use the
new scheme of checking the feature value to see if the target has
DL_RO_DYN_SECTION set. And we need to do all of this before the gcc-9.2
release.
This seems like a awful lot of trouble for what appears to be an minor feature.
There is also the possibility that there may be other programs or libraries
that have the same problem, and we just haven't noticed yet. The simpler
solution is to just accept that we can't change the value of DL_RO_DYN_SECTION
unless we are doing a major ABI break for some other reason.
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To: glibc-bugs@sourceware.org
Subject: [Bug math/24208] [powerpc] Enable log/logf in libmvec vector math library on POWER VSX
Date: Thu, 09 May 2019 00:18:00 -0000
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Shawn Landden <slandden at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |slandden at gmail dot com
--- Comment #1 from Shawn Landden <slandden at gmail dot com> ---
As I discussed here: https://sourceware.org/ml/libc-alpha/2019-05/msg00192.html
Two attempts were not able to increase performance with a vector log or logf,
(I suspect) for lack of a vector gather instruction in ppc64el ISA 3.0.
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Subject: [Bug dynamic-link/24476] __libc_freeres triggers bad free in libdl if dlerror was not used
Date: Thu, 09 May 2019 14:37:00 -0000
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Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-05-09
CC| |mark at klomp dot org
Ever confirmed|0 |1
--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
Proposed fix. Only free the memory if __libc_once (once, init) has been called.
diff --git a/dlfcn/dlerror.c b/dlfcn/dlerror.c
index 2737658..41a41ee 100644
--- a/dlfcn/dlerror.c
+++ b/dlfcn/dlerror.c
@@ -230,13 +230,16 @@ free_key_mem (void *mem)
void
__dlerror_main_freeres (void)
{
- void *mem;
- /* Free the global memory if used. */
- check_free (&last_result);
- /* Free the TSD memory if used. */
- mem = __libc_getspecific (key);
- if (mem != NULL)
- free_key_mem (mem);
+ if (__libc_once_get (once))
+ {
+ void *mem;
+ /* Free the global memory if used. */
+ check_free (&last_result);
+ /* Free the TSD memory if used. */
+ mem = __libc_getspecific (key);
+ if (mem != NULL)
+ free_key_mem (mem);
+ }
}
struct dlfcn_hook *_dlfcn_hook __attribute__((nocommon));
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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/24537] nptl/tst-eintr1 test case can hit task limits on some kernels and break testing
Date: Thu, 09 May 2019 15:56:00 -0000
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--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Szabolcs Nagy <nsz@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=18aa51ee0d1a9c555d9fee93441cd075cd9b5975
commit 18aa51ee0d1a9c555d9fee93441cd075cd9b5975
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Wed May 8 14:50:47 2019 +0100
Move nptl/tst-eintr1 to xtests
Don't run nptl/tst-eintr1 by normal make check because it can spuriously
break testing on various linux kernels. (Currently this affects the
aarch64 glibc buildbot machine which regularly fails and loses test
results.)
[BZ #24537]
* nptl/Makefile: Move tst-eintr1 to xtests.
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Subject: [Bug build/24537] nptl/tst-eintr1 test case can hit task limits on some kernels and break testing
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Szabolcs Nagy <nsz at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |2.30
--- Comment #2 from Szabolcs Nagy <nsz at gcc dot gnu.org> ---
the test got moved to xtests so it no longer affect normal make check runs.
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Subject: [Bug dynamic-link/24476] __libc_freeres triggers bad free in libdl if dlerror was not used
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--- Comment #3 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Mark Wielaard from comment #2)
> Proposed fix. Only free the memory if __libc_once (once, init) has been
> called.
>
> diff --git a/dlfcn/dlerror.c b/dlfcn/dlerror.c
> index 2737658..41a41ee 100644
> --- a/dlfcn/dlerror.c
> +++ b/dlfcn/dlerror.c
> @@ -230,13 +230,16 @@ free_key_mem (void *mem)
> void
> __dlerror_main_freeres (void)
> {
> - void *mem;
> - /* Free the global memory if used. */
> - check_free (&last_result);
> - /* Free the TSD memory if used. */
> - mem = __libc_getspecific (key);
> - if (mem != NULL)
> - free_key_mem (mem);
> + if (__libc_once_get (once))
> + {
> + void *mem;
> + /* Free the global memory if used. */
> + check_free (&last_result);
> + /* Free the TSD memory if used. */
> + mem = __libc_getspecific (key);
> + if (mem != NULL)
> + free_key_mem (mem);
> + }
> }
>
> struct dlfcn_hook *_dlfcn_hook __attribute__((nocommon));
I reviewed this on libc-alpha.
It isn't quite right, and I noticed a similar failure if the key fails to be
created.
I have suggested some changes for Mark to look at.
I think we're almost done though.
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From: "vectoroc at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug locale/18441] Performance regression due to strcoll_l changes
Date: Thu, 09 May 2019 19:45:00 -0000
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vectoroc at gmail dot com changed:
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CC| |vectoroc at gmail dot com
--- Comment #13 from vectoroc at gmail dot com ---
Hello. Is there any chance that the issues will be fixed? Unfortunately
PostgreSQL Is unable to use ICU some base features (e.g in analyze operation).
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From: "romain.geissler at amadeus dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/24544] New: elf/tst-pldd doesn't work if you install with a --prefix
Date: Thu, 09 May 2019 20:20:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24544
Bug ID: 24544
Summary: elf/tst-pldd doesn't work if you install with a
--prefix
Product: glibc
Version: 2.29
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: build
Assignee: unassigned at sourceware dot org
Reporter: romain.geissler at amadeus dot com
CC: carlos at redhat dot com
Target Milestone: ---
Hi,
If you install glibc in a non-standard folder with --prefix, obviously the
binary pldd is not found in "/usr/bin/pldd". Would it be possible to either:
- patch the test to take into account the prefix
- or consider this test as unsupported if a prefix was used
?
Cheers,
Romain
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Subject: [Bug math/24208] [powerpc] Enable log/logf in libmvec vector math library on POWER VSX
Date: Thu, 09 May 2019 20:25:00 -0000
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Tulio Magno Quites Machado Filho <tuliom at ascii dot art.br> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
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--- Comment #2 from Tulio Magno Quites Machado Filho <tuliom at ascii dot art.br> ---
Patches merged into branch tuliom/libmvec.
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Subject: [Bug math/20123] [powerpc] Enable libmvec vector math library on POWER VSX
Date: Thu, 09 May 2019 20:25:00 -0000
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Bug 20123 depends on bug 24208, which changed state.
Bug 24208 Summary: [powerpc] Enable log/logf in libmvec vector math library on POWER VSX
https://sourceware.org/bugzilla/show_bug.cgi?id=24208
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
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From: "carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug locale/18441] Performance regression due to strcoll_l changes
Date: Thu, 09 May 2019 20:44:00 -0000
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--- Comment #14 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to vectoroc from comment #13)
> Hello. Is there any chance that the issues will be fixed? Unfortunately
> PostgreSQL Is unable to use ICU some base features (e.g in analyze
> operation).
We haven't had anyone working on strcoll_l performance improvements. So it's
unlikely that this will get merged or reviewed any time soon.
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From: "carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug build/24544] elf/tst-pldd doesn't work if you install with a --prefix
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Carlos O'Donell <carlos at redhat dot com> changed:
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--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Romain Geissler from comment #0)
> Hi,
>
> If you install glibc in a non-standard folder with --prefix, obviously the
> binary pldd is not found in "/usr/bin/pldd". Would it be possible to either:
> - patch the test to take into account the prefix
> - or consider this test as unsupported if a prefix was used
> ?
We need to patch the test to take into account the prefix.
The test should have used 'support_install_prefix' as the prefix for the
install.
Thank you for reporting this, and please feel free to work up a patch to
correct this. Instead of /usr/bin/pldd we should use support_install_prefix +
bin/pldd and construct the path that way to run it.
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From: "bluebat at member dot fsf.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug localedata/24409] Updates for TW locales
Date: Fri, 10 May 2019 05:23:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24409
--- Comment #2 from Wei-Lun Chao <bluebat at member dot fsf.org> ---
[Ping]
Two presentations from me: (sorry in chinese only)
https://speakerdeck.com/bluebat/locales-for-chinese-dialects
https://speakerdeck.com/bluebat/look-at-yue-desktop
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Subject: [Bug localedata/23831] nl_NL missing LC_NUMERIC thousands_sep
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| |t
--- Comment #1 from Pander <pander at users dot sourceforge.net> ---
I can confirm that this needs to be fixed. Is a patch file needed for this or
can this be fixed directly by a maintainer?
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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug malloc/24531] Malloc tunables give tcache assertion failures
Date: Fri, 10 May 2019 15:40:00 -0000
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--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Wilco Dijkstra <wilco@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5ad533e8e65092be962e414e0417112c65d154fb
commit 5ad533e8e65092be962e414e0417112c65d154fb
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date: Fri May 10 16:38:21 2019 +0100
Fix tcache count maximum (BZ #24531)
The tcache counts[] array is a char, which has a very small range and thus
may overflow. When setting tcache_count tunable, there is no overflow
check.
However the tunable must not be larger than the maximum value of the tcache
counts[] array, otherwise it can overflow when filling the tcache.
[BZ #24531]
* malloc/malloc.c (MAX_TCACHE_COUNT): New define.
(do_set_tcache_count): Only update if count is small enough.
* manual/tunables.texi (glibc.malloc.tcache_count): Document max value.
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>From glibc-bugs-return-45429-listarch-glibc-bugs=sources.redhat.com@sourceware.org Fri May 10 15:41:55 2019
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Subject: [Bug malloc/24531] Malloc tunables give tcache assertion failures
Date: Fri, 10 May 2019 15:41:00 -0000
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Wilco <wdijkstr at arm dot com> changed:
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--- Comment #2 from Wilco <wdijkstr at arm dot com> ---
Fixed for GLIBC 2.30.
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>From glibc-bugs-return-45430-listarch-glibc-bugs=sources.redhat.com@sourceware.org Sat May 11 13:32:42 2019
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From: "bruno at clisp dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/23076] Iconv translitterate with profile
Date: Sat, 11 May 2019 13:32:00 -0000
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--- Comment #15 from Bruno Haible <bruno at clisp dot org> ---
A note about transliteration in general:
glibc implements transliteration regarding a character set, and thus responds
to the frequent case (in the years 2000-2005) that an application needs to
process a file in UTF-8, while the locale is an 8-bit locale.
Nowadays, the more frequent use of transliteration is a culture-aware
transliteration from one script to another script. The charset is not the
important factor here. For example, when doing transliteration from Punjabi in
Gurmukhi script to Punjabi in Shahmukhi (Arabic) script, the input and output
are both UTF-8, therefore the glibc's transliteration system does not help. And
such use-cases are outside glibc anyway, since 99.9% of the applications don't
need culture-aware transliteration.
Therefore I think there is no need to extend glibc's transliteration facilities
any more. Separate packages are the way to go (and also easier to implement if
you can assume Unicode input and Unicode output, without the charset-related
baggage that glibc's transliteration carries).
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Subject: [Bug math/24209] [powerpc] Enable exp/expf in libmvec vector math library on POWER VSX
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To: glibc-bugs@sourceware.org
Subject: [Bug localedata/24535] Update locale data to Unicode 12.1.0
Date: Mon, 13 May 2019 16:10:00 -0000
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--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Mike Fabian <mfabian@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f6efec90c86a6576fe02f4bf220ed4f7bc0b5e14
commit f6efec90c86a6576fe02f4bf220ed4f7bc0b5e14
Author: Mike FABIAN <mfabian@redhat.com>
Date: Wed May 8 07:54:15 2019 +0200
Bug 24535: Update to Unicode 12.1.0
Unicode 12.1.0 Support: Character encoding, character type info, and
transliteration tables are all updated to Unicode 12.1.0, using
the generator scripts contributed by Mike FABIAN (Red Hat).
Some info about the number of characters added or changed:
Total added characters in newly generated CHARMAP: 1
added: <U32FF> /xe3/x8b/xbf SQUARE ERA NAME REIWA
Total added characters in newly generated WIDTH: 1
added: <U32FF> 2 : eaw=W category=So bidi=L name=SQUARE ERA NAME REIWA
graph: Added 1 characters in new ctype which were not in old ctype
graph: Added: ㋿ U+32FF SQUARE ERA NAME REIWA
print: Added 1 characters in new ctype which were not in old ctype
print: Added: ㋿ U+32FF SQUARE ERA NAME REIWA
punct: Added 1 characters in new ctype which were not in old ctype
punct: Added: ㋿ U+32FF SQUARE ERA NAME REIWA
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Subject: [Bug localedata/24535] Update locale data to Unicode 12.1.0
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Mike FABIAN <maiku.fabian at gmail dot com> changed:
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----------------------------------------------------------------------------
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>From glibc-bugs-return-45435-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 13 16:13:38 2019
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Subject: [Bug localedata/24535] Update locale data to Unicode 12.1.0
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Mike FABIAN <maiku.fabian at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Mike FABIAN <maiku.fabian at gmail dot com> ---
Patch is pushed to glibc master.
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Subject: [Bug localedata/24307] Update locale data to Unicode 12.0.0
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Mike FABIAN <maiku.fabian at gmail dot com> changed:
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--- Comment #3 from Mike FABIAN <maiku.fabian at gmail dot com> ---
This patch is included in glibc master.
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Subject: [Bug libc/20338] Parsing of /etc/gshadow can return bad pointers causing segfaults in applications
Date: Tue, 14 May 2019 00:08:00 -0000
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>From glibc-bugs-return-45437-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 14 00:36:46 2019
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From: "howaboutsynergy at pm dot me" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug malloc/24551] New: mmap: accessing memory beyond mmap-ed region doesn't segfault
Date: Tue, 14 May 2019 00:36:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24551
Bug ID: 24551
Summary: mmap: accessing memory beyond mmap-ed region doesn't
segfault
Product: glibc
Version: 2.29
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Severity: minor
Priority: P2
Component: malloc
Assignee: unassigned at sourceware dot org
Reporter: howaboutsynergy at pm dot me
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Is this even a bug?
with glibc 2.28 mmap-ing 1 byte (in a kernel with page_size 4096 bytes) like:
`addr = mmap (NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);`
... allows accesses until addr[16384-1] and only segfaults at accessing
addr[16384] (page 4 instead of 2)
but with glibc 2.29, segfault happens only at addr[188416] (page 46 instead of
2)
for details see comment 14 & 15 in:
https://bugzilla.kernel.org/show_bug.cgi?id=203537#c14
Note that I tried this with MAP_FILE (and an actual file) not just with
MAP_ANONYMOUS but I found that the effects/results are the same.
I would expect segfault(or SIGBUSS? according to the man page) would happen
when hitting page 2 (ie. addr[0x1000]) but this would seem to require something
like what valdis mentioned: " * valdis wonders how hard it would be to add an
"allocate non-accessible guard page at both ends" flag to mmap()."
So, is the manual in need of updating? since SIGBUS isn't generated as stated
in these circumstances:
man 2 mmap:
SIGBUS Attempted access to a portion of the buffer that does not correspond
to the file (for example, beyond the end of the file, including the case where
another process has truncated the file).
man mmap (ie. map 3p mmap):
The system shall always zero-fill any partial page at the end of an object.
Further, the system shall never write out any modified portions of the last
page of an object which are beyond its end. References within the address range
starting at pa and continuing for len bytes to whole pages following the end of
an object shall result in delivery of a SIGBUS signal.
An implementation may generate SIGBUS signals when a reference would cause
an error in the mapped object, such as out-of-space condition.
(pa=addr and len=size in my case)
At the very least, SIGBUS isn't generated beyond the end of the file until the
end of the page.
Note: SIGBUS is generated when file is a 0 byte file (from what I've tested)
and this is to be expected and working normally (now that I know enough to
understand it).
For a 200MiB mmap, both glibc versions allow accesses until page 442 beyond
mmap-ed region is reached (page 443 for v2.29) and only then segfault.
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>From glibc-bugs-return-45438-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 14 00:39:53 2019
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Subject: [Bug malloc/24551] mmap: accessing memory beyond mmap-ed region doesn't segfault
Date: Tue, 14 May 2019 00:39:00 -0000
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howaboutsynergy at pm dot me changed:
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--- Comment #1 from howaboutsynergy at pm dot me ---
oops
What not to put in a new report:
Questions about the correctness or the expected behaviour of standardised
system calls. These might be more appropriately asked in other forums.
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>From glibc-bugs-return-45439-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 14 06:58:39 2019
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Subject: [Bug malloc/24551] mmap: accessing memory beyond mmap-ed region doesn't segfault
Date: Tue, 14 May 2019 06:58:00 -0000
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Florian Weimer <fweimer at redhat dot com> changed:
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| |/show_bug.cgi?id=203537
Resolution|--- |INVALID
Flags| |security-
--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
If you need guard pages, you need to map extra pages and leave them with
PROT_NONE protection flags.
Changes in mapping behavior are expected for different kernel versions.
Different glibc versions have different library sizes and perhaps even load
segments, so they trigger different kernel behavior, too.
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>From glibc-bugs-return-45440-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 14 13:51:08 2019
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Subject: [Bug libc/24492] utmp/wtmp locking allows non-privileged user to deny service
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Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
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| |rg
--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
This issue seems to exist on Solaris and AIX as well, although they uses a
different path (/var/run/utmpx for Solaris and /etc/utmp). As with glibc-based
system, its permission is similar that it allows users to read-lock it:
Solaris:
$ ls -l /var/run/utmpx
-rw-r--r-- 1 root bin 7440 May 14 14:56 /var/run/utmpx
AIX:
$ ls -l /etc/utmp
-rw-r--r-- 1 root system 38232 May 14 08:39 /etc/utmp
The same issue also prevents further login on the system, as sshd for instance.
I think a better alternative would just to make the utmp file no accessible to
user as default with the side effect of making utmp{x} interfaces return EPERM
as default. I am not sure how it would play on its usage in login process, but
I also don't think using a different lock file while still using default
permission for /var/run/utmp would be an improvement here. The privileged
process still need to have non-blocked access to utmp regardless and I think
adding a timeout to abort in such cases is also not an option (besides it is
not defined in the standard, it also not expected such functions fail in this
scenario). Another possibility is to route utmp{x} interfaces to a privileged
process.
Not sure which would be the best option, thoughts?
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>From glibc-bugs-return-45441-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 14 14:17:09 2019
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Subject: [Bug libc/24492] utmp/wtmp locking allows non-privileged user to deny service
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>From glibc-bugs-return-45443-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 14 14:26:47 2019
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Subject: [Bug libc/24492] utmp/wtmp locking allows non-privileged user to deny service
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--- Comment #2 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Adhemerval Zanella from comment #1)
> I think a better alternative would just to make the utmp file no accessible
> to user as default with the side effect of making utmp{x} interfaces return
> EPERM as default. I am not sure how it would play on its usage in login
> process, but I also don't think using a different lock file while still
> using default permission for /var/run/utmp would be an improvement here.
> The privileged process still need to have non-blocked access to utmp
> regardless and I think adding a timeout to abort in such cases is also not
> an option (besides it is not defined in the standard, it also not expected
> such functions fail in this scenario). Another possibility is to route
> utmp{x} interfaces to a privileged process.
>
> Not sure which would be the best option, thoughts?
Privileged processes can be expected to coordinate access and complete writes
and release locks in a timely fashion. So the writers can block other writers
or readers.
Unprivileged readers cannot be trusted to complete reads or release locks in a
timely fashion, and should have no impact on the privileged writers. The
readers cannot block other writers, but could block other readers (if
required).
It seems like we should be able to implement this with the Linux filesystem
primivites, but I haven't done a deep analysis of this issue.
This is a security issue, and Florian has added security+ flag, but it's one
that has existed for a long time.
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From: "OxFF-Alex at yandex dot ru" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8
Date: Tue, 14 May 2019 14:31:00 -0000
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----------------------------------------------------------------------------
CC| |OxFF-Alex at yandex dot ru
--- Comment #6 from OxFF-Alex <OxFF-Alex at yandex dot ru> ---
I also have this bug.
$ uname -a
Linux serbinov 4.18.0-17-generic #18~18.04.1-Ubuntu SMP Fri Mar 15 15:27:12 UTC
2019 x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -d
Description: Ubuntu 18.04.2 LTS
But a have three different crashes depending on number of input symbols:
Code:
int main()
{
setlocale(LC_ALL, "ru_RU.UTF-8");
getwc(stdin);
return 0;
}
Results:
$
$ ./a.out
111111111111111111111111
*** stack smashing detected ***: <unknown> terminated
Aborted (core dumped)
$
$ ./a.out
111111111111111111111111111111111111111111111111111111111111111111111111111111
free(): invalid pointer
Aborted (core dumped)
$
$ ./a.out
1111111111111111111111111111111111111
Segmentation fault (core dumped)
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To: glibc-bugs@sourceware.org
Subject: [Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8
Date: Tue, 14 May 2019 14:36:00 -0000
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--- Comment #7 from OxFF-Alex <OxFF-Alex at yandex dot ru> ---
In additional:
$ locale
LANG=en_US.UTF-8
LANGUAGE=
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=ru_RU.UTF-8
LC_TIME=ru_RU.UTF-8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=ru_RU.UTF-8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=ru_RU.UTF-8
LC_NAME=ru_RU.UTF-8
LC_ADDRESS=ru_RU.UTF-8
LC_TELEPHONE=ru_RU.UTF-8
LC_MEASUREMENT=ru_RU.UTF-8
LC_IDENTIFICATION=ru_RU.UTF-8
LC_ALL=
$
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Subject: [Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8
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--- Comment #8 from Andreas Schwab <schwab@linux-m68k.org> ---
At this point in _IO_wfile_sync, delta is always negative:
nread = (*cv->__codecvt_do_length) (cv, &fp->_wide_data->_IO_state,
fp->_IO_read_base,
fp->_IO_read_end, delta);
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>From glibc-bugs-return-45447-listarch-glibc-bugs=sources.redhat.com@sourceware.org Tue May 14 15:32:03 2019
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Subject: [Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8
Date: Tue, 14 May 2019 15:32:00 -0000
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--- Comment #9 from Andreas Schwab <schwab@linux-m68k.org> ---
That should fix it:
diff --git a/libio/wfileops.c b/libio/wfileops.c
index 5bc785b2b6..b30ef81813 100644
--- a/libio/wfileops.c
+++ b/libio/wfileops.c
@@ -508,11 +508,11 @@ _IO_wfile_sync (FILE *fp)
generate the wide characters up to the current reading
position. */
int nread;
-
+ size_t wnread = fp->_wide_data->_IO_read_ptr -
fp->_wide_data->_IO_read_base;
fp->_wide_data->_IO_state = fp->_wide_data->_IO_last_state;
nread = (*cv->__codecvt_do_length) (cv, &fp->_wide_data->_IO_state,
fp->_IO_read_base,
- fp->_IO_read_end, delta);
+ fp->_IO_read_end, wnread);
fp->_IO_read_ptr = fp->_IO_read_base + nread;
delta = -(fp->_IO_read_end - fp->_IO_read_base - nread);
}
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Subject: [Bug build/24544] elf/tst-pldd doesn't work if you install with a --prefix
Date: Tue, 14 May 2019 17:38:00 -0000
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--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Adhemerval Zanella
<azanella@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=da2b83ef6ba6f4c974664f69e715cc85b9173938
commit da2b83ef6ba6f4c974664f69e715cc85b9173938
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon May 13 13:13:46 2019 -0300
elf: Fix tst-pldd for non-default --prefix and/or --bindir (BZ#24544)
Use a new libsupport support_bindir_prefix instead of a hardcoded
/usr/bin to create the pldd path on container directory.
Checked on x86_64-linux-gnu with default and non-default --prefix and
--bindir paths, as well with --enable-hardcoded-path-in-tests.
[BZ #24544]
* elf/tst-pldd.c (do_test): Use support_bindir_prefix instead of
pre-defined value.
Reviewed-by: DJ Delorie <dj@redhat.com>
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Subject: [Bug build/24544] elf/tst-pldd doesn't work if you install with a --prefix
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Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |adhemerval.zanella at linaro dot o
| |rg
Version|2.29 |2.30
Resolution|--- |FIXED
Assignee|unassigned at sourceware dot org |adhemerval.zanella at linaro dot o
| |rg
Target Milestone|--- |2.30
--- Comment #3 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed by da2b83ef6ba6f4c974664f69e715cc85b9173938.
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Subject: =?UTF-8?B?W0J1ZyBidWlsZC8yNDU1Nl0gTmV3OiBbR0NDIDldIGVycm9yOiDigJglcw==?= =?UTF-8?B?4oCZIGRpcmVjdGl2ZSBhcmd1bWVudCBpcyBudWxsIFstV2Vycm9yPWZvcm1h?= =?UTF-8?B?dC1vdmVyZmxvdz1d?Date: Tue, 14 May 2019 22:38:00 -0000
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Bug ID: 24556
Summary: [GCC 9] error: ‘%s’ directive argument is null
[-Werror=format-overflow=]
Product: glibc
Version: 2.30
Status: NEW
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CC: carlos at redhat dot com
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With GCC 9 and -O3, I got
In file included from ../include/bits/error.h:1,
from ../misc/error.h:57,
from ../include/error.h:2,
from bench-string.h:60,
from bench-strstr.c:22:
In function ‘error’,
inlined from ‘do_one_test’ at bench-strstr.c:149:7,
inlined from ‘do_test’ at bench-strstr.c:201:5,
inlined from ‘test_main’ at bench-strstr.c:220:2:
../include/bits/../../misc/bits/error.h:42:5: error: ‘%s’ directive argument is
null [-Werror=format-overflow=]
42 | __error_alias (__status, __errnum, __format, __va_arg_pack ());
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘error’,
inlined from ‘do_one_test’ at bench-strstr.c:149:7,
inlined from ‘do_test’ at bench-strstr.c:201:5,
inlined from ‘test_main’ at bench-strstr.c:227:2:
../include/bits/../../misc/bits/error.h:42:5: error: ‘%s’ directive argument is
null [-Werror=format-overflow=]
42 | __error_alias (__status, __errnum, __format, __va_arg_pack ());
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [../o-iterator.mk:9:
/export/build/gnu/tools-build/glibc-march-9/build-x86_64-linux/benchtests/bench-strstr.o]
Error 1
There is
do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
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>From glibc-bugs-return-45451-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 10:37:38 2019
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From: "flo at geekplace dot eu" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug manual/24558] New: Broken sentence in manual/tunables.texi
Date: Wed, 15 May 2019 10:37:00 -0000
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Bug ID: 24558
Summary: Broken sentence in manual/tunables.texi
Product: glibc
Version: 2.31
Status: UNCONFIRMED
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Assignee: unassigned at sourceware dot org
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CC: mtk.manpages at gmail dot com
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The sentence in tunables.texi
> Lock elision will use memory transactions to under certain conditions, to elide locks and improve performance.
is missing a comma and has to many 'to's, it should probably read
> Lock elision will use memory transactions to, under certain conditions, elide locks and improve performance.
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>From glibc-bugs-return-45452-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 10:39:00 2019
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Subject: [Bug manual/24558] Broken sentence in manual/tunables.texi
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--- Comment #1 from Florian Schmaus <flo at geekplace dot eu> ---
Created attachment 11776
--> https://sourceware.org/bugzilla/attachment.cgi?id=11776&action=edit
Patch to fix a sentence in manual/tunables.texi
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>From glibc-bugs-return-45453-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 11:25:32 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug libc/10353] Methods for deleting all file descriptors greater than given integer (closefrom)
Date: Wed, 15 May 2019 11:25:00 -0000
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Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|WONTFIX |---
Assignee|drepper.fsp at gmail dot com |unassigned at sourceware dot org
Summary|Methods for deleting all |Methods for deleting all
|file descriptors greater |file descriptors greater
|than given integer |than given integer
| |(closefrom)
--- Comment #14 from Florian Weimer <fweimer at redhat dot com> ---
We should implement closefrom and related functions from Solaris. A
high-quality implementation (that cannot fail) will require kernel support.
I do not think there is a way to obtain the number of the highest file
descriptor currently in use because RLIMIT_NOFILE is not enforced for existing
descriptors. Opening /proc/self/fd may fail.
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>From glibc-bugs-return-45454-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 12:10:47 2019
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/10353] Methods for deleting all file descriptors greater than given integer (closefrom)
Date: Wed, 15 May 2019 12:10:00 -0000
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--- Comment #15 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Florian Weimer from comment #14)
> We should implement closefrom and related functions from Solaris. A
> high-quality implementation (that cannot fail) will require kernel support.
Agreed. I have a wip patch that I might send. Solaris11 also defines as
non-portable interfaces:
posix_spawn_file_actions_addchdir_np
posix_spawn_file_actions_addclosefrom_np
posix_spawnattr_setsigignore_np
posix_spawnattr_getsigignore_np
posix_spawnattr_setvamask_np
posix_spawnattr_getvamask_np
We already implements posix_spawn_file_actions_addchdir_np. The
posix_spawnattr_setsigignore_np/posix_spawnattr_getsigignore_np seems
completary addition to
posix_spawnattr_setsigdefault/posix_spawnattr_getsigdefault.
I am trying to figure out what
posix_spawnattr_setvamask_np/posix_spawnattr_getvamask_np do, I couldn't find
any information online.
>
> I do not think there is a way to obtain the number of the highest file
> descriptor currently in use because RLIMIT_NOFILE is not enforced for
> existing descriptors. Opening /proc/self/fd may fail.
I think an initial userland implementation need just to try opening
/proc/self/fd and if it fails bail out with an error. Relying on RLIMIT_NOFILE,
even as a fallback, might still leak file descriptors.
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>From glibc-bugs-return-45455-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 12:17:19 2019
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Subject: [Bug libc/10353] Methods for deleting all file descriptors greater than given integer (closefrom)
Date: Wed, 15 May 2019 12:17:00 -0000
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--- Comment #16 from Florian Weimer <fweimer at redhat dot com> ---
closefrom cannot fail. I'm happy to implement /proc/self/fd fallback, but only
if we also have a proper system call that can be used to implement this
correctly (without possible failure).
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>From glibc-bugs-return-45456-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 12:35:44 2019
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/10353] Methods for deleting all file descriptors greater than given integer (closefrom)
Date: Wed, 15 May 2019 12:35:00 -0000
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--- Comment #17 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Florian Weimer from comment #16)
> closefrom cannot fail. I'm happy to implement /proc/self/fd fallback, but
> only if we also have a proper system call that can be used to implement this
> correctly (without possible failure).
It would fail as other file actions, by not spawning the process and returning
a generic error (we might also extend the posix_spawn to add a way to actually
provide more information of what has failed exactly). I think it would be
feasible to implement closefrom initially with/proc/self/fd and later if/when
we get an actual syscall to move it as a fallback.
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>From glibc-bugs-return-45457-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 13:12:37 2019
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Subject: [Bug dynamic-link/24561] New: _dl_addr: linear lookup inefficient, making mtrace() feature very slow
Date: Wed, 15 May 2019 13:12:00 -0000
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Bug ID: 24561
Summary: _dl_addr: linear lookup inefficient, making mtrace()
feature very slow
Product: glibc
Version: 2.31
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: dynamic-link
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Created attachment 11778
--> https://sourceware.org/bugzilla/attachment.cgi?id=11778&action=edit
perf top screenshot
I'm "profiling" memory usage during Glibc build using mtrace(), mtrace() being
enabled through a preloaded shared object injected through LD_PRELOAD into
every programs run by ./configure and make.
Unfortunately mtrace() hooks are inducing very expensive calls to _dl_addr().
It's so expansive that _dl_addr() is responsible for ~80% of the CPU cycles
according to linux's perf top, while I'm using make -j2, thus having only 2
jobs in parallel.
Samples: 5M of event 'cycles:ppp', 4000 Hz, Event count (approx.): 109055426197
lost: 0/0 drop: 0/0
Overhead Shared Object Symbol
84,91% libc-2.29.so [.] _dl_addr
0,61% perf [.] hpp__sort_overhead
0,36% perf [.] rb_next
0,24% libpixman-1.so.0.38.0 [.] sse2_fill
0,22% perf [.] hist_entry__sort
0,19% libpthread-2.29.so [.] __pthread_mutex_lock
0,18% [kernel] [k] update_blocked_averages
0,18% perf [.] perf_hpp__is_dynamic_entry
0,17% [kernel] [k] copy_user_enhanced_fast_string
0,16% perf [.] sort__dso_cmp
0,15% libc-2.29.so [.] __vfprintf_internal
0,15% libc-2.29.so [.] __strcmp_avx2
0,15% libc-2.29.so [.] __memmove_avx_unaligned_erms
0,13% libglib-2.0.so.0.6000.2 [.] g_hash_table_lookup
0,13% perf [.] output_resort
0,12% [snd_hda_intel] [k] pci_azx_readl
0,12% libc-2.29.so [.] _int_malloc
0,10% perf [.] __hists__add_entry
It's not visible here, but they're two cc1 processes running (on my desktop).
_dl_addr() is way too slow. It's so slow I think it's using a very ineffective
way of looking things up.
Perhaps mtrace() hooks can be improved to put address resolutions results in a
cache (but it would require to be invalidated on dlopen(), dlclose()), but I
believe _dl_addr() could be improved, so that users of dladdr(), or dladdr1()
could benefit from a speed up.
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--- Comment #1 from Yann Droneaud <yann at droneaud dot fr> ---
Created attachment 11779
--> https://sourceware.org/bugzilla/attachment.cgi?id=11779&action=edit
top and perf top screens
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>From glibc-bugs-return-45459-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 13:18:20 2019
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Subject: [Bug dynamic-link/24561] _dl_addr: linear lookup inefficient, making mtrace() feature very slow
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Yann Droneaud <yann at droneaud dot fr> changed:
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>From glibc-bugs-return-45460-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 14:49:15 2019
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--- Comment #10 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andreas Schwab <schwab@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=32ff397533715988c19cbf3675dcbd727ec13e18
commit 32ff397533715988c19cbf3675dcbd727ec13e18
Author: Andreas Schwab <schwab@suse.de>
Date: Tue May 14 17:14:59 2019 +0200
Fix crash in _IO_wfile_sync (bug 20568)
When computing the length of the converted part of the stdio buffer, use
the number of consumed wide characters, not the (negative) distance to the
end of the wide buffer.
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>From glibc-bugs-return-45461-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 14:51:00 2019
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--- Comment #11 from Andreas Schwab <schwab@linux-m68k.org> ---
Fixed in 2.30.
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Florian Weimer <fweimer at redhat dot com> changed:
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See Also| |https://bugzilla.redhat.com
| |/show_bug.cgi?id=1710460
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>From glibc-bugs-return-45464-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 15:24:58 2019
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Subject: [Bug libc/10353] Methods for deleting all file descriptors greater than given integer (closefrom)
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Florian Weimer <fweimer at redhat dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #18 from Florian Weimer <fweimer at redhat dot com> ---
Right, for the posix_spawn extension, we do not need a fail-safe function.
(FWOW, I have just posted a patch for a public getdents64 system call wrapper,
and I'm working on async-signal-safe directory stream parsing.)
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>From glibc-bugs-return-45463-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 15:24:01 2019
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Subject: [Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8
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--- Comment #12 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.29/master branch has been updated by Florian Weimer
<fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c6177be4b92d5d7df50a785652d1912db511423e
commit c6177be4b92d5d7df50a785652d1912db511423e
Author: Andreas Schwab <schwab@suse.de>
Date: Wed May 15 17:09:05 2019 +0200
Fix crash in _IO_wfile_sync (bug 20568)
When computing the length of the converted part of the stdio buffer, use
the number of consumed wide characters, not the (negative) distance to the
end of the wide buffer.
(cherry picked from commit 32ff397533715988c19cbf3675dcbd727ec13e18)
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>From glibc-bugs-return-45465-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 15:35:14 2019
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Subject: [Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8
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--- Comment #13 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.28/master branch has been updated by Florian Weimer
<fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d948478bc586dec2fe3edd49e8e55f3893b3f854
commit d948478bc586dec2fe3edd49e8e55f3893b3f854
Author: Andreas Schwab <schwab@suse.de>
Date: Tue May 14 17:14:59 2019 +0200
Fix crash in _IO_wfile_sync (bug 20568)
When computing the length of the converted part of the stdio buffer, use
the number of consumed wide characters, not the (negative) distance to the
end of the wide buffer.
(cherry picked from commit 32ff397533715988c19cbf3675dcbd727ec13e18)
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--- Comment #14 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.27/master branch has been updated by Florian Weimer
<fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f9c3c12f3365c3e26aa11a31c6effea7d959f0ba
commit f9c3c12f3365c3e26aa11a31c6effea7d959f0ba
Author: Andreas Schwab <schwab@suse.de>
Date: Tue May 14 17:14:59 2019 +0200
Fix crash in _IO_wfile_sync (bug 20568)
When computing the length of the converted part of the stdio buffer, use
the number of consumed wide characters, not the (negative) distance to the
end of the wide buffer.
(cherry picked from commit 32ff397533715988c19cbf3675dcbd727ec13e18)
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From: "yann at droneaud dot fr" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24561] _dl_addr: linear lookup inefficient, making mtrace() feature very slow
Date: Wed, 15 May 2019 16:18:00 -0000
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Yann Droneaud <yann at droneaud dot fr> changed:
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--- Comment #2 from Yann Droneaud <yann at droneaud dot fr> ---
Created attachment 11780
--> https://sourceware.org/bugzilla/attachment.cgi?id=11780&action=edit
mtrace() LD_PRELOAD injector
From https://github.com/opteya/libmtraceall
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>From glibc-bugs-return-45468-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 16:48:30 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/24561] _dl_addr: linear lookup inefficient, making mtrace() feature very slow
Date: Wed, 15 May 2019 16:48:00 -0000
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Florian Weimer <fweimer at redhat dot com> changed:
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--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
Torvald and I discussed this a while back in the context of the GCC exception
handling issue: https://gcc.gnu.org/ml/gcc/2013-05/msg00287.html
I think I have a prototype patch somewhere for implementing a binary search in
_dl_find_dso_for_object (without locking). I just need to polish it, and we
need a review of the (non-trivial) concurrency bits in it.
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From: "mark at klomp dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug dynamic-link/24476] __libc_freeres triggers bad free in libdl if dlerror was not used
Date: Wed, 15 May 2019 19:51:00 -0000
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Mark Wielaard <mark at klomp dot org> changed:
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Assignee|carlos at redhat dot com |mark at klomp dot org
--- Comment #4 from Mark Wielaard <mark at klomp dot org> ---
Updated patch: https://sourceware.org/ml/libc-alpha/2019-05/msg00320.html
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>From glibc-bugs-return-45470-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 15 21:50:55 2019
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Subject: [Bug dynamic-link/24476] __libc_freeres triggers bad free in libdl if dlerror was not used
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Mark Wielaard <mark at klomp dot org> changed:
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--- Comment #5 from Mark Wielaard <mark at klomp dot org> ---
commit 11b451c8868d8a2b0edc5dfd44fc58d9ee538be0
Author: Mark Wielaard <mark@klomp.org>
Date: Wed May 15 17:14:01 2019 +0200
dlfcn: Guard __dlerror_main_freeres with __libc_once_get (once) [BZ# 24476]
dlerror.c (__dlerror_main_freeres) will try to free resources which only
have been initialized when init () has been called. That function is
called when resources are needed using __libc_once (once, init) where
once is a __libc_once_define (static, once) in the dlerror.c file.
Trying to free those resources if init () hasn't been called will
produce errors under valgrind memcheck. So guard the freeing of those
resources using __libc_once_get (once) and make sure we have a valid
key. Also add a similar guard to __dlerror ().
* dlfcn/dlerror.c (__dlerror_main_freeres): Guard using
__libc_once_get (once) and static_bug == NULL.
(__dlerror): Check we have a valid key, set result to static_buf
otherwise.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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>From glibc-bugs-return-45471-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 16 08:21:46 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug stdio/23525] Uninitialized multi-byte conversion state in fxprintf
Date: Thu, 16 May 2019 08:21:00 -0000
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Florian Weimer <fweimer at redhat dot com> changed:
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--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
The code clearly calls memset before mbsrtowcs:
memset (&mbstate, 0, sizeof mbstate);
res = __mbsrtowcs (wfmt, &fmt, len, &mbstate);
I don't know why I filed this bug.
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>From glibc-bugs-return-45472-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 16 08:26:00 2019
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Subject: [Bug stdio/24562] New: __fxprintf makes incorrect assumption about multibyte string conversion
Date: Thu, 16 May 2019 08:26:00 -0000
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Bug ID: 24562
Summary: __fxprintf makes incorrect assumption about multibyte
string conversion
Product: glibc
Version: 2.30
Status: NEW
Severity: normal
Priority: P2
Component: stdio
Assignee: unassigned at sourceware dot org
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Target Milestone: ---
locked_vfxprintf has this comment:
/* We must convert the narrow format string to a wide one.
Each byte can produce at most one wide character. */
This is not actually true for the TSCII single-byte character set.
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>From glibc-bugs-return-45473-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 16 08:47:10 2019
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Subject: [Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8
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--- Comment #15 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.26/master branch has been updated by Florian Weimer
<fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4385ec1d8af4203b23dce8c9dc2f1aff5acaf094
commit 4385ec1d8af4203b23dce8c9dc2f1aff5acaf094
Author: Andreas Schwab <schwab@suse.de>
Date: Tue May 14 17:14:59 2019 +0200
Fix crash in _IO_wfile_sync (bug 20568)
When computing the length of the converted part of the stdio buffer, use
the number of consumed wide characters, not the (negative) distance to the
end of the wide buffer.
(cherry picked from commit 32ff397533715988c19cbf3675dcbd727ec13e18)
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>From glibc-bugs-return-45474-listarch-glibc-bugs=sources.redhat.com@sourceware.org Thu May 16 08:48:37 2019
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Subject: [Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8
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--- Comment #16 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.26/master branch has been updated by Florian Weimer
<fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4385ec1d8af4203b23dce8c9dc2f1aff5acaf094
commit 4385ec1d8af4203b23dce8c9dc2f1aff5acaf094
Author: Andreas Schwab <schwab@suse.de>
Date: Tue May 14 17:14:59 2019 +0200
Fix crash in _IO_wfile_sync (bug 20568)
When computing the length of the converted part of the stdio buffer, use
the number of consumed wide characters, not the (negative) distance to the
end of the wide buffer.
(cherry picked from commit 32ff397533715988c19cbf3675dcbd727ec13e18)
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https://sourceware.org/bugzilla/show_bug.cgi?id=20568
--- Comment #17 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.25/master branch has been updated by Florian Weimer
<fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=60bc81ba47915817fb89bc2b80b0176ac1eeba07
commit 60bc81ba47915817fb89bc2b80b0176ac1eeba07
Author: Andreas Schwab <schwab@suse.de>
Date: Tue May 14 17:14:59 2019 +0200
Fix crash in _IO_wfile_sync (bug 20568)
When computing the length of the converted part of the stdio buffer, use
the number of consumed wide characters, not the (negative) distance to the
end of the wide buffer.
(cherry picked from commit 32ff397533715988c19cbf3675dcbd727ec13e18)
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Mark Wielaard <mark at klomp dot org> changed:
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----------------------------------------------------------------------------
Keywords| |glibc_2.28, glibc_2.29
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Subject: [Bug stdio/24562] __fxprintf makes incorrect assumption about multibyte string conversion
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Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |24563
Referenced Bugs:
https://sourceware.org/bugzilla/show_bug.cgi?id=24563
[Bug 24563] vfprintf makes incorrect assumption about wchar_t character count
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Subject: [Bug stdio/24563] New: vfprintf makes incorrect assumption about wchar_t character count
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https://sourceware.org/bugzilla/show_bug.cgi?id=24563
Bug ID: 24563
Summary: vfprintf makes incorrect assumption about wchar_t
character count
Product: glibc
Version: 2.30
Status: NEW
Severity: normal
Priority: P2
Component: stdio
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
Blocks: 24562
Target Milestone: ---
Flags: security-
This assumption is not true for exotic character sets as TSCII:
/* Allocate dynamically an array which definitely is long \
enough for the wide character version. Each byte in the \
multi-byte string can produce at most one wide character. */ \
if (__glibc_unlikely (len > SIZE_MAX / sizeof (wchar_t))) \
{ \
__set_errno (EOVERFLOW); \
done = -1; \
goto all_done; \
} \
See Unicode Technical Note 15 <https://www.unicode.org/notes/tn15/> for the
background.
Referenced Bugs:
https://sourceware.org/bugzilla/show_bug.cgi?id=24562
[Bug 24562] __fxprintf makes incorrect assumption about multibyte string
conversion
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--- Comment #6 from Mark Wielaard <mark at klomp dot org> ---
Also backported/cherry-picked to release/2.28/master and release/2.29/master.
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Subject: [Bug dynamic-link/24561] _dl_addr: linear lookup inefficient, making mtrace() feature very slow
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--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
Sorry, this came across wrong. If someone else has a patch for this, I'll
gladly review it.
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Subject: [Bug nptl/24568] New: gdb colored output makes nptl/test-*-printers fail
Date: Thu, 16 May 2019 17:55:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24568
Bug ID: 24568
Summary: gdb colored output makes nptl/test-*-printers fail
Product: glibc
Version: 2.29
Status: UNCONFIRMED
Severity: minor
Priority: P2
Component: nptl
Assignee: unassigned at sourceware dot org
Reporter: ats-sourceware at offog dot org
CC: drepper.fsp at gmail dot com
Target Milestone: ---
With current glibc 2.29 (git 980cb43f15c4320afc6272e7a508f1415413b945) and gdb
8.3, several tests fail:
FAIL: nptl/test-cond-printers
FAIL: nptl/test-condattr-printers
FAIL: nptl/test-mutex-printers
FAIL: nptl/test-mutexattr-printers
FAIL: nptl/test-rwlock-printers
FAIL: nptl/test-rwlockattr-printers
Examining the .out files, this is because gdb is producing messages with color
escapes in them that don't match the patterns the tests expect.
Hacking init_test in test_printers_common.py to do "set style enabled off"
fixes this, but maybe gdb should be in batch mode, or the terminal type set to
something that wouldn't use highlighting instead?
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/24570] New: alpha: compat msgctl uses __IPC_64
Date: Thu, 16 May 2019 19:04:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24570
Bug ID: 24570
Summary: alpha: compat msgctl uses __IPC_64
Product: glibc
Version: 2.25
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: adhemerval.zanella at linaro dot org
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Since glibc 2.25 (356c0aabd0191cdd7287ccf1ec8bbaa4862a0823) alpha passed
__IPC_64 on its compat msgctl:
---
int
attribute_compat_text_section
__old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf)
{
#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
return INLINE_SYSCALL_CALL (msgctl, msqid, cmd | __IPC_64, buf);
#else
return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd, 0, buf);
#endif
}
---
Fortunately alpha is currently the only ABI that has wire-up msgctl which also
requires the compat symbol handling.
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Subject: [Bug libc/24570] alpha: compat msgctl uses __IPC_64
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| |rg
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>From glibc-bugs-return-45485-listarch-glibc-bugs=sources.redhat.com@sourceware.org Sat May 18 19:22:36 2019
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To: glibc-bugs@sourceware.org
Subject: [Bug build/24577] New: 'make install-headers' fails for riscv64-unknown-linux-gnu: sysdeps/riscv/bits/wordsize.h:28:3: error: #error "rv32i-based targets are not supported"
Date: Sat, 18 May 2019 19:22:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24577
Bug ID: 24577
Summary: 'make install-headers' fails for
riscv64-unknown-linux-gnu:
sysdeps/riscv/bits/wordsize.h:28:3: error: #error
"rv32i-based targets are not supported"
Product: glibc
Version: 2.28
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: build
Assignee: unassigned at sourceware dot org
Reporter: slyfox at inbox dot ru
CC: carlos at redhat dot com
Target Milestone: ---
Gentoo bootstraps gcc cross-compilers in the following way:
1. build cross-binutils:
2. Install system headers (kernel headers and libc headers):
3. build minimal GCC without libc support (not able to link final
4. build complete libc (gcc will need crt.o files)
5. build full GCC (able to link final binaries for C and C++)
This bug is about build failure on [2.] step. Note: we don't have a
cross-compiler there.
More build failure details are at: https://bugs.gentoo.org/686248
The summary of it is failure to preprocess target files with host compiler:
x86_64-pc-linux-gnu-gcc -E -dM -MD -MP -MF
/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/bits/stdio_lim.dT
-MT
'/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/bits/stdio_lim.h
/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/bits/stdio_lim.d'
\
-I../include
-I/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/stdio-common
-I/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers
-I../sysdeps/unix/sysv/linux/riscv/rv64 -I../sysdeps/unix/sysv/linux/riscv
-I../sysdeps/riscv/nptl -I../sysdeps/unix/sysv/linux/generic
-I../sysdeps/unix/sysv/linux/wordsize-64 -I../sysdeps/unix/sysv/linux/include
-I../sysdeps/unix/sysv/linux -I../sysdeps/nptl -I../sysdeps/pthread
-I../sysdeps/gnu -I../sysdeps/unix/inet -I../sysdeps/unix/sysv
-I../sysdeps/unix -I../sysdeps/posix -I../sysdeps/riscv/rv64/rvd
-I../sysdeps/riscv/rv64/rvf -I../sysdeps/riscv/rvf -I../sysdeps/riscv/rvd
-I../sysdeps/riscv/rv64 -I../sysdeps/riscv -I../sysdeps/init_array
-I../sysdeps/ieee754/ldbl-128 -I../sysdeps/ieee754/dbl-64
-I../sysdeps/ieee754/flt-32 -I../sysdeps/wordsize-64 -I../sysdeps/ieee754
-I../sysdeps/generic -I.. -I../libio -I. -nostdinc -isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/9.1.0/include -isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/9.1.0/include-fixed -isystem
/usr/riscv64-unknown-linux-gnu/usr/include -xc - -o
/tmp/portage/cross-riscv64-unknown-linux-gnu/glibc-2.28-r6/work/build-default-riscv64-unknown-linux-gnu-headers/bits/stdio_lim.hT
In file included from ../posix/bits/posix1_lim.h:27,
from <stdin>:1:
../sysdeps/riscv/bits/wordsize.h:22:3: error: #error unsupported ABI
22 | # error unsupported ABI
| ^~~~~
../sysdeps/riscv/bits/wordsize.h:28:3: error: #error "rv32i-based targets are
not supported"
28 | # error "rv32i-based targets are not supported"
| ^~~~~
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To: glibc-bugs@sourceware.org
Subject: [Bug build/24577] 'make install-headers' fails for riscv64-unknown-linux-gnu: sysdeps/riscv/bits/wordsize.h:28:3: error: #error "rv32i-based targets are not supported"
Date: Sat, 18 May 2019 19:26:00 -0000
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--- Comment #1 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Created attachment 11784
--> https://sourceware.org/bugzilla/attachment.cgi?id=11784&action=edit
glibc-2.28-cppflags.patch
glibc-2.28-cppflags.patch allows passing CPPFLAGS to depend generation to
workaround the failure.
This way Gentoo work failure around by calling ./configure as:
CC=x86_64-pc-linux-gnu-gcc CPPFLAGS='-U_FORTIFY_SOURCE -D__riscv_xlen=64
-D__riscv_flen=64 -D__riscv_float_abi_double=1 -D__riscv_atomic=1' ./configure
--build=x86_64-pc-linux-gnu --host=risc v64-unknown-linux-gnu
--with-headers=/usr/riscv64-unknown-linux-gnu/usr/include --prefix=/usr ...
Looks like riscv is the only target that requires CPPFLAGS workaround. Should
glibc headers (or sysdeps/riscv/preconfigure) be restructures to inject these
automatically?
Thank you!
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From: "liucheng32 at huawei dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/24579] New: uninitialized return value of pmap_set & pmap_unset
Date: Sun, 19 May 2019 12:34:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24579
Bug ID: 24579
Summary: uninitialized return value of pmap_set & pmap_unset
Product: glibc
Version: 2.29
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: network
Assignee: unassigned at sourceware dot org
Reporter: liucheng32 at huawei dot com
Target Milestone: ---
The return value "rslt" in pmap_set/pmap_unset is not initialized, and is not
assigned in most cases, which may result in returning any random value.
In the case of pmap_set, rslt is assigned when CLNT_CALL(client, ...) !=
RPC_SUCCESS, and is used as a parameter in the CLNT_CALL macro; In the case of
pmap_unset, rslt is only used as a parameter in the CLNT_CALL macro.
Further analysis of the CLNT_CALL macro definition shows that there are several
implementations: UDP in clnt_udp.c, TCP in clnt_tcp.c, RAW in clnt_raw.c and
UNIX in clnt_unix.c. Analyzing the implementations of UDP, RAW and most cases
of TCP, UNIX, I find that second parameter(rlst) is not assigned.
So I think the following patch should be needed:
----------------------------------------------------------
From 3b25218da4d5de36954a21c28a88379a2b1f6e5e Mon Sep 17 00:00:00 2001
From: l00383200 <liucheng32@huawei.com>
Date: Sun, 19 May 2019 19:26:09 +0800
Subject: [PATCH] uninitialized return value of pmap_set and pmap_unset
The return value "rslt" in pmap_set/pmap_unset is not initialized, and is not
assigned in most cases, which may result in returning any random value.
---
sunrpc/pmap_clnt.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sunrpc/pmap_clnt.c b/sunrpc/pmap_clnt.c
index 69b4907..9cc9729 100644
--- a/sunrpc/pmap_clnt.c
+++ b/sunrpc/pmap_clnt.c
@@ -109,7 +109,7 @@ pmap_set (u_long program, u_long version, int protocol,
u_short port)
int socket = -1;
CLIENT *client;
struct pmap parms;
- bool_t rslt;
+ bool_t rslt = TRUE;
if (!__get_myaddress (&myaddress))
return FALSE;
@@ -145,7 +145,7 @@ pmap_unset (u_long program, u_long version)
int socket = -1;
CLIENT *client;
struct pmap parms;
- bool_t rslt;
+ bool_t rslt = TRUE;
if (!__get_myaddress (&myaddress))
return FALSE;
--
1.8.5.6
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Subject: [Bug network/24579] uninitialized return value of pmap_set & pmap_unset
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What |Removed |Added
----------------------------------------------------------------------------
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>From glibc-bugs-return-45490-listarch-glibc-bugs=sources.redhat.com@sourceware.org Sun May 19 20:11:38 2019
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Subject: [Bug localedata/24580] New: Appropriate AM/PM time representation for en_NG
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https://sourceware.org/bugzilla/show_bug.cgi?id=24580
Bug ID: 24580
Summary: Appropriate AM/PM time representation for en_NG
Product: glibc
Version: unspecified
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Created attachment 11785
--> https://sourceware.org/bugzilla/attachment.cgi?id=11785&action=edit
Patch for en_NG
Include AM/PM 12hr time representation for en_NG locale
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>From glibc-bugs-return-45491-listarch-glibc-bugs=sources.redhat.com@sourceware.org Sun May 19 20:14:24 2019
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>From glibc-bugs-return-45492-listarch-glibc-bugs=sources.redhat.com@sourceware.org Sun May 19 21:29:55 2019
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From: "scott.franco42 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/24581] New: Unable to build tip or 2.29 glibc with default options
Date: Sun, 19 May 2019 21:29:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24581
Bug ID: 24581
Summary: Unable to build tip or 2.29 glibc with default options
Product: glibc
Version: 2.29
Status: UNCONFIRMED
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Priority: P2
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Assignee: unassigned at sourceware dot org
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Hi, I have been unable to build from either the tip version or the 2.29 version
obtained by the page:
https://www.gnu.org/software/libc/sources.html
It builds for quite a while but fails:
gcc -static -static-libgcc -static-libstdc++ -shared -static-libgcc
-Wl,-dynamic-linker=/home/samiam/projects/petit_ami/glibc_local/lib/ld-linux-x86-64.so.2
-Wl,-z,defs -B/home/samiam/projects/petit_ami/glibc_build/csu/
-Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both
-L/home/samiam/projects/petit_ami/glibc_build
-L/home/samiam/projects/petit_ami/glibc_build/math
-L/home/samiam/projects/petit_ami/glibc_build/elf
-L/home/samiam/projects/petit_ami/glibc_build/dlfcn
-L/home/samiam/projects/petit_ami/glibc_build/nss
-L/home/samiam/projects/petit_ami/glibc_build/nis
-L/home/samiam/projects/petit_ami/glibc_build/rt
-L/home/samiam/projects/petit_ami/glibc_build/resolv
-L/home/samiam/projects/petit_ami/glibc_build/mathvec
-L/home/samiam/projects/petit_ami/glibc_build/support
-L/home/samiam/projects/petit_ami/glibc_build/crypt
-L/home/samiam/projects/petit_ami/glibc_build/nptl
-Wl,-rpath-link=/home/samiam/projects/petit_ami/glibc_build:/home/samiam/projects/petit_ami/glibc_build/math:/home/samiam/projects/petit_ami/glibc_build/elf:/home/samiam/projects/petit_ami/glibc_build/dlfcn:/home/samiam/projects/petit_ami/glibc_build/nss:/home/samiam/projects/petit_ami/glibc_build/nis:/home/samiam/projects/petit_ami/glibc_build/rt:/home/samiam/projects/petit_ami/glibc_build/resolv:/home/samiam/projects/petit_ami/glibc_build/mathvec:/home/samiam/projects/petit_ami/glibc_build/support:/home/samiam/projects/petit_ami/glibc_build/crypt:/home/samiam/projects/petit_ami/glibc_build/nptl
-o /home/samiam/projects/petit_ami/glibc_build/elf/sotruss-lib.so -T
/home/samiam/projects/petit_ami/glibc_build/shlib.lds
/home/samiam/projects/petit_ami/glibc_build/csu/abi-note.o -Wl,--as-needed
/home/samiam/projects/petit_ami/glibc_build/elf/sotruss-lib.os
-Wl,--no-as-needed -Wl,--start-group
/home/samiam/projects/petit_ami/glibc_build/libc.so
/home/samiam/projects/petit_ami/glibc_build/libc_nonshared.a -Wl,--as-needed
/home/samiam/projects/petit_ami/glibc_build/elf/ld.so -Wl,--no-as-needed
-Wl,--end-group
9112 /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/7/crtbeginT.o: relocation
R_X86_64_32 against hidden symbol `__TMC_END__' can not be used when making a
shared object
9113 /usr/bin/ld: final link failed: Nonrepresentable section on output
9114 collect2: error: ld returned 1 exit status
9115 Makefile:129: recipe for target
'/home/samiam/projects/petit_ami/glibc_build/elf/sotruss-lib.so' failed
9116 make[2]: ***
[/home/samiam/projects/petit_ami/glibc_build/elf/sotruss-lib.so] Error 1
9117 make[2]: Leaving directory '/home/samiam/projects/petit_ami/glibc/elf'
9118 Makefile:258: recipe for target 'elf/subdir_lib' failed
9119 make[1]: *** [elf/subdir_lib] Error 2
9120 make[1]: Leaving directory '/home/samiam/projects/petit_ami/glibc'
9121 Makefile:9: recipe for target 'all' failed
9122 make: *** [all] Error 2
My configure line is:
../glibc/configure --prefix=/home/samiam/projects/petit_ami/glibc_local
CC="gcc" CFLAGS="-O2"
I note that in the error, there are both "-static" and "-shared" options in the
same compiler line. If I take the above and use it as a compile line alone from
the make, and then remove the first "-static" option, it compiles without
error. I have also tried configuring with:
../glibc/configure --prefix=/home/samiam/projects/petit_ami/glibc_local
IE, default options, same error. I have also tried both the tip and the 2.29
version as the page says.
My gcc is:
samiam@samiam-linux-pc:~/projects/petit_ami/glibc_build$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.4.0-1ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04)
I believe it is getting conflicting options. I don't know the glibc make system
sufficiently to fix this, but am working on it.
Thank you,
Scott Franco
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>From glibc-bugs-return-45493-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 06:39:48 2019
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To: glibc-bugs@sourceware.org
Subject: [Bug network/24579] uninitialized return value of pmap_set & pmap_unset
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>From glibc-bugs-return-45494-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 10:19:11 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug stdio/24583] New: Memory leak in fopen with ccs argument
Date: Mon, 20 May 2019 10:19:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24583
Bug ID: 24583
Summary: Memory leak in fopen with ccs argument
Product: glibc
Version: 2.30
Status: NEW
Severity: minor
Priority: P2
Component: stdio
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
Target Milestone: ---
Flags: security-
Reproducer:
#include <err.h>
#include <locale.h>
#include <stdio.h>
int
main (void)
{
if (setlocale (LC_ALL, "fr_FR.iso885915@euro") == NULL)
err (1, "setlocale");
FILE *fp = fopen ("/etc/passwd", "r,ccs=UTF-8");
if (fp == NULL)
err (1, "fopen");
if (fclose (fp) != 0)
err (1, "fclose");
return 0;
}
The problem seems to be that the libio code never calls __gconv_close_transform
for the gconv functions returned by __wcsmbs_named_conv. Calling
__gconv_release_step in _IO_new_fclose is not sufficient.
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To: glibc-bugs@sourceware.org
Subject: [Bug stdio/24583] Memory leak in fopen with ccs argument
Date: Mon, 20 May 2019 10:47:00 -0000
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--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
In the LeakSanitizer sources, this is identified as:
// Leak in glibc's gconv caused by fopen(..., "r,ccs=UNICODE")
"leak:__gconv_lookup_cache\n"
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug locale/24584] New: Data race in __wcsmbs_clone_conv
Date: Mon, 20 May 2019 10:55:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24584
Bug ID: 24584
Summary: Data race in __wcsmbs_clone_conv
Product: glibc
Version: 2.30
Status: NEW
Severity: normal
Priority: P2
Component: locale
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
Target Milestone: ---
Flags: security-
__wcsmbs_clone_conv contains no locking and does this:
/* Now increment the usage counters.
Note: This assumes copy->*_nsteps == 1. */
if (copy->towc->__shlib_handle != NULL)
++copy->towc->__counter;
if (copy->tomb->__shlib_handle != NULL)
++copy->tomb->__counter;
In other places, the counter is only modified under __gconv_lock.
(Adding an overflow check would not hurt, either.)
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>From glibc-bugs-return-45497-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 11:05:59 2019
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Subject: [Bug locale/24584] Data race in __wcsmbs_clone_conv
Date: Mon, 20 May 2019 11:05:00 -0000
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>From glibc-bugs-return-45498-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 11:06:23 2019
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Subject: [Bug locale/24584] Data race in __wcsmbs_clone_conv
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>From glibc-bugs-return-45499-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 11:41:29 2019
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Subject: [Bug stdio/24583] Memory leak in fopen with ccs argument
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>From glibc-bugs-return-45500-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 12:05:58 2019
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug build/24581] Unable to build tip or 2.29 glibc with default options
Date: Mon, 20 May 2019 12:05:00 -0000
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Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
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| |rg
--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Are you sure the extra '-static' is not coming from a local configuration?
Using the released 2.29 source with the same configuration you used (including
the same gcc from ubuntu 18.04), I see:
gcc -shared -static-libgcc
-Wl,-dynamic-linker=/home/samiam/projects/petit_ami/glibc_local/lib/ld-linux-x86-64.so.2
-Wl,-z,defs -B/tmp/glibc-2.29/build/csu/ -Wl,-z,combreloc -Wl,-z,relro
-Wl,--hash-style=both -L/tmp/glibc-2.29/build -L/tmp/glibc-2.29/build/math
-L/tmp/glibc-2.29/build/elf -L/tmp/glibc-2.29/build/dlfcn
-L/tmp/glibc-2.29/build/nss -L/tmp/glibc-2.29/build/nis
-L/tmp/glibc-2.29/build/rt -L/tmp/glibc-2.29/build/resolv
-L/tmp/glibc-2.29/build/mathvec -L/tmp/glibc-2.29/build/support
-L/tmp/glibc-2.29/build/crypt -L/tmp/glibc-2.29/build/nptl
-Wl,-rpath-link=/tmp/glibc-2.29/build:/tmp/glibc-2.29/build/math:/tmp/glibc-2.29/build/elf:/tmp/glibc-2.29/build/dlfcn:/tmp/glibc-2.29/build/nss:/tmp/glibc-2.29/build/nis:/tmp/glibc-2.29/build/rt:/tmp/glibc-2.29/build/resolv:/tmp/glibc-2.29/build/mathvec:/tmp/glibc-2.29/build/support:/tmp/glibc-2.29/build/crypt:/tmp/glibc-2.29/build/nptl
-o /tmp/glibc-2.29/build/elf/sotruss-lib.so
/tmp/glibc-2.29/build/csu/abi-note.o -Wl,--as-needed
/tmp/glibc-2.29/build/elf/sotruss-lib.os -Wl,--no-as-needed -Wl,--start-group
/tmp/glibc-2.29/build/libc.so /tmp/glibc-2.29/build/libc_nonshared.a
-Wl,--as-needed /tmp/glibc-2.29/build/elf/ld.so -Wl,--no-as-needed
-Wl,--end-group
Also, '-static' is just used on some specific rules within glibc make
configuration (static tests, some distributes binaries like sln). It really
does not make sense to add such configuration to a *shared library* and I
almost sure this is not coming from glibc build environment. Could you
double-check if is not something your environment?
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>From glibc-bugs-return-45501-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 12:18:50 2019
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Subject: [Bug stdio/24563] vfprintf makes incorrect assumption about wchar_t character count
Date: Mon, 20 May 2019 12:18:00 -0000
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Florian Weimer <fweimer at redhat dot com> changed:
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--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
I have a patch (based on an earlier patch which introduces piece-by-piece
conversion for %sl), but it does not completely fix my test case yet.
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>From glibc-bugs-return-45502-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 12:34:08 2019
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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug stdio/24588] New: Remove codecvt vtables from libio
Date: Mon, 20 May 2019 12:34:00 -0000
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Bug ID: 24588
Summary: Remove codecvt vtables from libio
Product: glibc
Version: 2.30
Status: NEW
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Priority: P2
Component: stdio
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
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codecvt support was added to the internal copy of libio in GCC 3.0, but the C++
compiler in that GCC version uses a different ABI for placing vtable pointers,
so libio in glibc is already ABI-incompatible with C++, and cannot be used with
libstdc++.
I believe that we can remove the codecvt vtable without affecting old binaries
(even though the struct definition was exposed in <libio.h>).
Also see <https://sourceware.org/glibc/wiki/LibioVtables>.
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>From glibc-bugs-return-45503-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 13:46:23 2019
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From: "scott.franco42 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/24581] Unable to build tip or 2.29 glibc with default options
Date: Mon, 20 May 2019 13:46:00 -0000
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--- Comment #2 from Scott Franco <scott.franco42 at gmail dot com> ---
So you are saying it pulls in an environment variable? I'll check. I'd assumed
it didn't take anything from the environment.
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>From glibc-bugs-return-45504-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 13:49:42 2019
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/24581] Unable to build tip or 2.29 glibc with default options
Date: Mon, 20 May 2019 13:49:00 -0000
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--- Comment #3 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Scott Franco from comment #2)
> So you are saying it pulls in an environment variable? I'll check. I'd
> assumed it didn't take anything from the environment.
It is most likely, I am not seeing how glibc build environment is adding this
'-static' cflag with the build description you provided.
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>From glibc-bugs-return-45505-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 14:17:37 2019
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From: "scott.franco42 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug build/24581] Unable to build tip or 2.29 glibc with default options
Date: Mon, 20 May 2019 14:17:00 -0000
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Scott Franco <scott.franco42 at gmail dot com> changed:
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--- Comment #4 from Scott Franco <scott.franco42 at gmail dot com> ---
Verified, it was the LDFLAGS. I guess the loader reads that regardless.
Thanks much, lesson learned.
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>From glibc-bugs-return-45506-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 14:33:14 2019
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From: "schwab@linux-m68k.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug build/24581] Unable to build tip or 2.29 glibc with default options
Date: Mon, 20 May 2019 14:33:00 -0000
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Andreas Schwab <schwab@linux-m68k.org> changed:
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Resolution|FIXED |INVALID
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>From glibc-bugs-return-45507-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 15:57:58 2019
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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug libc/24570] alpha: compat msgctl uses __IPC_64
Date: Mon, 20 May 2019 15:57:00 -0000
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--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Adhemerval Zanella
<azanella@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dfba907fedcb0e95af735a2d064761559f703ab6
commit dfba907fedcb0e95af735a2d064761559f703ab6
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Tue May 14 15:01:32 2019 -0300
sysvipc: Fix compat msgctl (BZ#24570)
The __IPC64 flags is meant to be used to enable the new sysv struct
format when the architectures supports it (ARCH_WANT_IPC_PARSE_VERSION
config flag on Linux kernel).
This currently issue only affects alpha.
[BZ #24570]
* sysdeps/unix/sysv/linux/msgctl.c (__old_msgctl): Remove __IPC_64
usage.
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>From glibc-bugs-return-45508-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 15:59:58 2019
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Subject: [Bug libc/24570] alpha: compat msgctl uses __IPC_64
Date: Mon, 20 May 2019 15:59:00 -0000
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Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
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--- Comment #2 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed on 2.30 (dfba907fedcb0e95af735a2d064761559f703ab6).
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>From glibc-bugs-return-45509-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 17:05:45 2019
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From: "joseph at codesourcery dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug build/24577] 'make install-headers' fails for riscv64-unknown-linux-gnu: sysdeps/riscv/bits/wordsize.h:28:3: error: #error "rv32i-based targets are not supported"
Date: Mon, 20 May 2019 17:05:00 -0000
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--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Minimal GCC (C only, static libgcc only, built --with-newlib
--without-headers where --with-newlib is how you tell GCC to define
inhibit_libc for the libgcc build) does not need libc headers. I
recommend removing libc header installation from step 2. Since around
glibc 2.16, glibc should fully support being built with such a minimal
GCC, with the stripped glibc binaries being identical to those you get if
you build it using the full GCC. (Running the glibc testsuite requires
building glibc using the full GCC, however. And there are other bugs
noting that when building glibc with the minimal GCC, you still need to
set CXX to point to the (nonexistent) C++ compiler for the configuration
for which you're building glibc, as otherwise configure may pick up a
native C++ compiler and cause trouble later in the build process.)
See build-many-glibcs.py for more details of a modern bootstrap process
known to work for all glibc configurations.
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>From glibc-bugs-return-45510-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 18:07:53 2019
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Subject: [Bug build/24577] 'make install-headers' fails for riscv64-unknown-linux-gnu: sysdeps/riscv/bits/wordsize.h:28:3: error: #error "rv32i-based targets are not supported"
Date: Mon, 20 May 2019 18:07:00 -0000
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--- Comment #3 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Thank you! We'll migrate to installation without headers.
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>From glibc-bugs-return-45511-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 20:13:42 2019
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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug stdio/24588] Remove codecvt vtables from libio
Date: Mon, 20 May 2019 20:13:00 -0000
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--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Florian Weimer <fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=09e1b0e3f6facc1af2dbcfef204f0aaa8718772b
commit 09e1b0e3f6facc1af2dbcfef204f0aaa8718772b
Author: Florian Weimer <fweimer@redhat.com>
Date: Mon May 20 21:54:57 2019 +0200
libio: Remove codecvt vtable [BZ #24588]
The codecvt vtable is not a real vtable because it also contains the
conversion state data. Furthermore, wide stream support was added to
GCC 3.0, after a C++ ABI bump, so there is no compatibility
requirement with libstdc++.
This change removes several unmangled function pointers which could
be used with a corrupted FILE object to redirect execution. (libio
vtable verification did not cover the codecvt vtable.)
Reviewed-by: Yann Droneaud <ydroneaud@opteya.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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>From glibc-bugs-return-45512-listarch-glibc-bugs=sources.redhat.com@sourceware.org Mon May 20 20:14:25 2019
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Subject: [Bug stdio/24588] Remove codecvt vtables from libio
Date: Mon, 20 May 2019 20:14:00 -0000
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Florian Weimer <fweimer at redhat dot com> changed:
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--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for glibc 2.30.
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Subject: [Bug stdio/24583] Memory leak in fopen with ccs argument
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--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Florian Weimer <fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7e740ab2e7be7d83b75513aa406e0b10875f7f9c
commit 7e740ab2e7be7d83b75513aa406e0b10875f7f9c
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue May 21 10:34:21 2019 +0200
libio: Fix gconv-related memory leak [BZ #24583]
struct gconv_fcts for the C locale is statically allocated,
and __gconv_close_transform deallocates the steps object.
Therefore this commit introduces __wcsmbs_close_conv to avoid
freeing the statically allocated steps objects.
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Subject: [Bug locale/24584] Data race in __wcsmbs_clone_conv
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--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Florian Weimer <fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c9c15ac3162d10a999bf71418fd710bf5676175e
commit c9c15ac3162d10a999bf71418fd710bf5676175e
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue May 21 10:19:46 2019 +0200
wcsmbs: Fix data race in __wcsmbs_clone_conv [BZ #24584]
This also adds an overflow check and documents the synchronization
requirement in <gconv.h>.
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--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for 2.30.
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Subject: [Bug locale/24584] Data race in __wcsmbs_clone_conv
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--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for 2.30.
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Subject: [Bug locale/19519] iconv(1) with -c option hangs on illegal multi-byte sequences (CVE-2016-10228)
Date: Tue, 21 May 2019 11:06:00 -0000
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--- Comment #13 from Arjun Shankar <arjun.is at lostca dot se> ---
Created attachment 11786
--> https://sourceware.org/bugzilla/attachment.cgi?id=11786&action=edit
Test to perform every possible 2-byte conversion from all charsets to UTF-8
I wrote a bash script that tests every possible 2-byte conversion from every
supported charset to UTF-8. It tests with all possible combinations of "-c"
"//TRANSLIT" and "//IGNORE" and takes tens of hours to run.
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Subject: [Bug locale/19519] iconv(1) with -c option hangs on illegal multi-byte sequences (CVE-2016-10228)
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--- Comment #14 from Arjun Shankar <arjun.is at lostca dot se> ---
Created attachment 11787
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Result of test run on Fedora 29 (release/2.28/master commit: 4a5e5882)
I ran the test on Fedora 29 (release/2.28/master commit: 4a5e5882) and found
hangs in more than half the supported character sets when converting to UTF-8.
Character sets listed as "OK" exhibited no hangs across the entire input
domain. Character sets that hung weren't tested past the first hang.
I expect that a lot (but not all) of these hangs are just duplicates; i.e. they
will vanish together with the same fix.
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To: glibc-bugs@sourceware.org
Subject: [Bug nptl/24595] New: [2.28 Regression]: Deadlock in atfork handler which calls dlclose
Date: Tue, 21 May 2019 22:26:00 -0000
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Bug ID: 24595
Summary: [2.28 Regression]: Deadlock in atfork handler which
calls dlclose
Product: glibc
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The specific use case is kind of complicated. I am using OpenVPN with a pkcs11
"smartcard" (actually GnuK). The software stack involved at the time consists
of
sys-libs/glibc-2.28-r6
sys-apps/pcsc-lite-1.8.24
dev-libs/opensc-0.18.0
dev-libs/pkcs11-helper-1.25.1
net-vpn/openvpn-2.4.6
Note that both glibc and opensc have newer versions now, but I have not gotten
the chance to test with those.
The situation is that pkcs11-helper installs an atfork handler, whose purpose
is to deinitialize the smartcard in the child process, to avoid inadvertantly
allowing it to inherit an open connection to the smartcard. As part of
opensc's "Finalize", it dlclose()s its backend module, which in this case is
pcsc-lite. It appears that pcsc-lite also has an atfork handler installed (I
did not investigate that one, but presumably it is also for the purpose of
closing any open smartcard in the child). Glibc registers a mechansim,
apparently the same way that C++ destructors are registered, to remove any
atfork handlers that are registered in a module when it is being unloaded. Now
that there is a (non-recursive) lock around the list of atfork handlers, and
the handlers are called while that lock is held, attempting to unregister an
atfork handler from within an atfork handler callback results in a deadlock.
There is no need for you to bisect - I already tracked down the commit in
question - 27761a1042daf01987e7d79636d0c41511c6df3c - and confirmed that
reverting this solves my deadlock. If you want a simple test case to reproduce
this, I think the most simple incarnation would be to have an executable and a
shared library. The executable would register with pthread_atfork(), dlopen()
the shared library, and call something in it which also registers an atfork
handler with pthread_atfork(). The executable would then fork(), and in its
atfork child handler dlclose() the shared library. This should deadlock with
glibc 2.28 (and 2.29, though I have not yet confirmed this), but work fine with
2.27 and older.
Backtrace:
#0 0x4ec8eb4c in __lll_lock_wait_private () from /lib/libc.so.6
#1 0x4ec8efc6 in __unregister_atfork () from /lib/libc.so.6
#2 0x4ebbd5a9 in __cxa_finalize () from /lib/libc.so.6
#3 0x4dc1a3b1 in __do_global_dtors_aux () from /usr/lib/libpcsclite.so.1
#4 0x4f05ddca in _dl_close_worker () from /lib/ld-linux.so.2
#5 0x4f05e9e2 in _dl_close () from /lib/ld-linux.so.2
#6 0x4ecbdda9 in _dl_catch_exception () from /lib/libc.so.6
#7 0x4ecbde50 in _dl_catch_error () from /lib/libc.so.6
#8 0x4ed3d5e4 in _dlerror_run () from /lib/libdl.so.2
#9 0x4ed3ce9f in dlclose () from /lib/libdl.so.2
#10 0x4ea70664 in sc_dlclose () from /usr/lib/libopensc.so.6
#11 0x4e98d3fb in pcsc_finish () from /usr/lib/libopensc.so.6
#12 0x4e95b259 in sc_release_context () from /usr/lib/libopensc.so.6
#13 0x4eb3ebf2 in C_Finalize () from /usr/lib/opensc-pkcs11.so
#14 0x4eb3ec72 in C_Initialize () from /usr/lib/opensc-pkcs11.so
#15 0x4efe6a1b in __pkcs11h_threading_atfork_child ()
from /usr/lib/libpkcs11-helper.so.1
#16 0x4ec8f1ed in __run_fork_handlers () from /lib/libc.so.6
#17 0x4ec43aa8 in fork () from /lib/libc.so.6
#18 0x4f00c540 in fork_compat () from /lib/libpthread.so.0
#19 0x125511d5 in openvpn_execve ()
#20 0x12551355 in openvpn_execve_check ()
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To: glibc-bugs@sourceware.org
Subject: [Bug nptl/24595] [2.28 Regression]: Deadlock in atfork handler which calls dlclose
Date: Wed, 22 May 2019 11:41:00 -0000
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Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |adhemerval.zanella at linaro dot o
| |rg
--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Created attachment 11790
--> https://sourceware.org/bugzilla/attachment.cgi?id=11790&action=edit
Fix proposal
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/24595] [2.28 Regression]: Deadlock in atfork handler which calls dlclose
Date: Wed, 22 May 2019 11:46:00 -0000
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--- Comment #2 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Jeremy Drake from comment #0)
> https://bugs.gentoo.org/685024
>
> The specific use case is kind of complicated. I am using OpenVPN with a
> pkcs11 "smartcard" (actually GnuK). The software stack involved at the time
> consists of
>
> sys-libs/glibc-2.28-r6
> sys-apps/pcsc-lite-1.8.24
> dev-libs/opensc-0.18.0
> dev-libs/pkcs11-helper-1.25.1
> net-vpn/openvpn-2.4.6
>
> Note that both glibc and opensc have newer versions now, but I have not
> gotten the chance to test with those.
>
> The situation is that pkcs11-helper installs an atfork handler, whose
> purpose is to deinitialize the smartcard in the child process, to avoid
> inadvertantly allowing it to inherit an open connection to the smartcard.
> As part of opensc's "Finalize", it dlclose()s its backend module, which in
> this case is pcsc-lite. It appears that pcsc-lite also has an atfork
> handler installed (I did not investigate that one, but presumably it is also
> for the purpose of closing any open smartcard in the child). Glibc
> registers a mechansim, apparently the same way that C++ destructors are
> registered, to remove any atfork handlers that are registered in a module
> when it is being unloaded. Now that there is a (non-recursive) lock around
> the list of atfork handlers, and the handlers are called while that lock is
> held, attempting to unregister an atfork handler from within an atfork
> handler callback results in a deadlock.
The glibc-2.27 and used to support it by copying the atfork handlers on
multithread fork in lock-free way using dynamic stack allocation. A lock was
taken only when a symbol was actually removed, insertions (pthread_atfork) and
walking (running the handlers) only used atomics.
It has its drawbacks in some rough points, such some code complexity and
dynamic stack allocation., so the refactor done on
27761a1042daf01987e7d79636d0c41511c6df3c was aimed mostly to simplify the code
and remove the alloca usage.
>
> There is no need for you to bisect - I already tracked down the commit in
> question - 27761a1042daf01987e7d79636d0c41511c6df3c - and confirmed that
> reverting this solves my deadlock. If you want a simple test case to
> reproduce this, I think the most simple incarnation would be to have an
> executable and a shared library. The executable would register with
> pthread_atfork(), dlopen() the shared library, and call something in it
> which also registers an atfork handler with pthread_atfork(). The
> executable would then fork(), and in its atfork child handler dlclose() the
> shared library. This should deadlock with glibc 2.28 (and 2.29, though I
> have not yet confirmed this), but work fine with 2.27 and older.
The atfork handlers are not really well defined by POSIX standard, so it an
implementation detail what functions and environments it aims to implements.
It looks like the described scenario is indeed used by some programs so I think
it would be feasible to keep glibc support.
We need to make the atfork handling to use a recursive mutex and make the data
structure to handle reentracy. Unfortunately, I think the current one
(dynarray) is not the best suitable one due on reentracy the iterator is
usually an index (which might render invalid in an atfork handler removal). A
simple double-linked list should handle it.
Could you try the attached patch to see if it fixes the issue you are seeing? I
would like just to confirm before sending upstream to review.
Also keep in mind that the described use case is *far* from portable and most
likely will fail on different environments. The reduced test case based on
your description:
--
$ cat tst-atfork3.c
#include <stdio.h>
#include <dlfcn.h>
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
static void *handler;
static void
prepare_dlclose (void)
{
assert (dlclose (handler) == 0);
}
static void
parent_null (void)
{
}
static void
child_null (void)
{
}
static void *
thread_func (void *arg)
{
return 0;
}
int
main (void)
{
{
/* Make the process acts as multithread. */
pthread_attr_t attr;
assert (pthread_attr_init (&attr) == 0);
assert (pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED) == 0);
pthread_t thr;
assert (pthread_create (&thr, &attr, thread_func, NULL) == 0);
}
{
assert (pthread_atfork (prepare_dlclose, parent_null, child_null) == 0);
handler = dlopen ("tst-atfork3mod.so", RTLD_NOW);
assert (handler != NULL);
int (*atfork3mod_func) (void);
atfork3mod_func = dlsym (handler, "atfork3mod_func");
assert (atfork3mod_func != NULL);
atfork3mod_func ();
pid_t pid = fork ();
if (pid == 0)
exit (0);
}
return 0;
}
$ cat tst-atfork3mod.c
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <assert.h>
static void
mod_prepare (void)
{
}
static void
mod_parent (void)
{
}
static void
mod_child (void)
{
}
int atfork3mod_func (void)
{
assert (pthread_atfork (mod_prepare, mod_parent, mod_child) == 0);
return 0;
}
--
It fails on FreeBSD11 and AIX72 (former with a hang, latter with a invalid jump
at fork handler). It works on Solaris11 and Android (by reading bionic atfork
implementation).
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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug malloc/24531] Malloc tunables give tcache assertion failures
Date: Wed, 22 May 2019 13:29:00 -0000
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--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.29/master branch has been updated by Wilco Dijkstra
<wilco@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=95d66fecaabbc92ab53027e808f0fc1929c9f21a
commit 95d66fecaabbc92ab53027e808f0fc1929c9f21a
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date: Fri May 10 16:38:21 2019 +0100
Fix tcache count maximum (BZ #24531)
The tcache counts[] array is a char, which has a very small range and thus
may overflow. When setting tcache_count tunable, there is no overflow
check.
However the tunable must not be larger than the maximum value of the tcache
counts[] array, otherwise it can overflow when filling the tcache.
[BZ #24531]
* malloc/malloc.c (MAX_TCACHE_COUNT): New define.
(do_set_tcache_count): Only update if count is small enough.
* manual/tunables.texi (glibc.malloc.tcache_count): Document max value.
(cherry picked from commit 5ad533e8e65092be962e414e0417112c65d154fb)
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Subject: [Bug malloc/24531] Malloc tunables give tcache assertion failures
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--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.28/master branch has been updated by Wilco Dijkstra
<wilco@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=58d2672f64176fcb323859d3bd5240fb1cf8f25c
commit 58d2672f64176fcb323859d3bd5240fb1cf8f25c
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date: Fri May 10 16:38:21 2019 +0100
Fix tcache count maximum (BZ #24531)
The tcache counts[] array is a char, which has a very small range and thus
may overflow. When setting tcache_count tunable, there is no overflow
check.
However the tunable must not be larger than the maximum value of the tcache
counts[] array, otherwise it can overflow when filling the tcache.
[BZ #24531]
* malloc/malloc.c (MAX_TCACHE_COUNT): New define.
(do_set_tcache_count): Only update if count is small enough.
* manual/tunables.texi (glibc.malloc.tcache_count): Document max value.
(cherry picked from commit 5ad533e8e65092be962e414e0417112c65d154fb)
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Subject: [Bug malloc/24531] Malloc tunables give tcache assertion failures
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--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.27/master branch has been updated by Wilco Dijkstra
<wilco@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=54ba8bcd42355ad0c0ca763b6bba40a2b2829f38
commit 54ba8bcd42355ad0c0ca763b6bba40a2b2829f38
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date: Fri May 10 16:38:21 2019 +0100
Fix tcache count maximum (BZ #24531)
The tcache counts[] array is a char, which has a very small range and thus
may overflow. When setting tcache_count tunable, there is no overflow
check.
However the tunable must not be larger than the maximum value of the tcache
counts[] array, otherwise it can overflow when filling the tcache.
[BZ #24531]
* malloc/malloc.c (MAX_TCACHE_COUNT): New define.
(do_set_tcache_count): Only update if count is small enough.
* manual/tunables.texi (glibc.malloc.tcache_count): Document max value.
(cherry picked from commit 5ad533e8e65092be962e414e0417112c65d154fb)
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To: glibc-bugs@sourceware.org
Subject: [Bug malloc/24531] Malloc tunables give tcache assertion failures
Date: Wed, 22 May 2019 14:43:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=24531
--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.26/master branch has been updated by Wilco Dijkstra
<wilco@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ac92c66821fae2ae6587114acc454f97a6bc7859
commit ac92c66821fae2ae6587114acc454f97a6bc7859
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date: Fri May 10 16:38:21 2019 +0100
Fix tcache count maximum (BZ #24531)
The tcache counts[] array is a char, which has a very small range and thus
may overflow. When setting tcache_count tunable, there is no overflow
check.
However the tunable must not be larger than the maximum value of the tcache
counts[] array, otherwise it can overflow when filling the tcache.
[BZ #24531]
* malloc/malloc.c (MAX_TCACHE_COUNT): New define.
(do_set_tcache_count): Only update if count is small enough.
* manual/tunables.texi (glibc.malloc.tcache_count): Document max value.
(cherry picked from commit 5ad533e8e65092be962e414e0417112c65d154fb)
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From: "gentoo-bugzilla at jdrake dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/24595] [2.28 Regression]: Deadlock in atfork handler which calls dlclose
Date: Wed, 22 May 2019 17:34:00 -0000
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--- Comment #3 from Jeremy Drake <gentoo-bugzilla at jdrake dot com> ---
(In reply to Adhemerval Zanella from comment #2)
> Could you try the attached patch to see if it fixes the issue you are
> seeing? I would like just to confirm before sending upstream to review.
I will try to get to that this weekend. I just had a quick read-through, and I
was curious about the __libc_lock_unlock_recursive. I had read that recursive
locks generally need to be unlocked on the same thread they were locked on, but
in the case of the child handler, it is not only a different thread, but a
different process entirely. Is this a supported case for this lock type? It
seems it may be backed by a recursive pthread mutex, whose manpage says "If a
thread attempts to unlock a mutex that it has not locked or a mutex which is
unlocked, an error shall be returned."
>
> Also keep in mind that the described use case is *far* from portable and
> most likely will fail on different environments. The reduced test case
> based on your description:
The exact case is that the dlclose happens in the child handler, not the
prepare handler, but other than that this is what I was describing.
> It fails on FreeBSD11 and AIX72 (former with a hang, latter with a invalid
> jump at fork handler). It works on Solaris11 and Android (by reading bionic
> atfork implementation).
It might be nice if someone who understood such things told the
OpenSC/pkcs11-helper people that.
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>From glibc-bugs-return-45527-listarch-glibc-bugs=sources.redhat.com@sourceware.org Wed May 22 18:26:47 2019
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From: "adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/24595] [2.28 Regression]: Deadlock in atfork handler which calls dlclose
Date: Wed, 22 May 2019 18:26:00 -0000
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--- Comment #4 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Jeremy Drake from comment #3)
> (In reply to Adhemerval Zanella from comment #2)
> > Could you try the attached patch to see if it fixes the issue you are
> > seeing? I would like just to confirm before sending upstream to review.
>
> I will try to get to that this weekend. I just had a quick read-through,
> and I was curious about the __libc_lock_unlock_recursive. I had read that
> recursive locks generally need to be unlocked on the same thread they were
> locked on, but in the case of the child handler, it is not only a different
> thread, but a different process entirely. Is this a supported case for this
> lock type? It seems it may be backed by a recursive pthread mutex, whose
> manpage says "If a thread attempts to unlock a mutex that it has not locked
> or a mutex which is unlocked, an error shall be returned."
The internal glibc locks (__libc_lock_*) are private to process, so the child
will unlock its copy after fork (remind that although not all thread are
replicated in Linux fork, the memory is).
>
> >
> > Also keep in mind that the described use case is *far* from portable and
> > most likely will fail on different environments. The reduced test case
> > based on your description:
>
> The exact case is that the dlclose happens in the child handler, not the
> prepare handler, but other than that this is what I was describing.
In fact is you dlclose on prepare the parent will hang, while if you do in the
child it will hang in child.
>
> > It fails on FreeBSD11 and AIX72 (former with a hang, latter with a invalid
> > jump at fork handler). It works on Solaris11 and Android (by reading bionic
> > atfork implementation).
>
> It might be nice if someone who understood such things told the
> OpenSC/pkcs11-helper people that.
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Subject: [Bug math/24603] New: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with -O3 -march=skylake
Date: Wed, 22 May 2019 19:07:00 -0000
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Bug ID: 24603
Summary: sysdeps/ieee754/dbl-64/branred.c is slow when compiled
with -O3 -march=skylake
Product: glibc
Version: 2.31
Status: NEW
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Target: x86-64
sysdeps/ieee754/dbl-64/branred.c is very slow when compiled with -O3
-march=skylake due to huge store forward stall:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90579
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Subject: [Bug math/24603] sysdeps/ieee754/dbl-64/branred.c is slow when compiled with -O3 -march=skylake
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^ permalink raw reply [flat|nested] 22+ messages in thread
* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
2019-05-01 20:33 ` [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user chewi at gentoo dot org
@ 2020-09-17 21:42 ` tg at mirbsd dot de
2020-10-02 8:54 ` danny.milo at gmail dot com
` (19 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: tg at mirbsd dot de @ 2020-09-17 21:42 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
Thorsten Glaser <tg at mirbsd dot de> changed:
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----------------------------------------------------------------------------
CC| |tg at mirbsd dot de
--- Comment #57 from Thorsten Glaser <tg at mirbsd dot de> ---
Jessica,
>Easiest thing would be to patch gcc/config/whatever.h to include:
>
> builtin_define ("_LARGEFILE_SOURCE=1"); \
> builtin_define ("_LARGEFILE64_SOURCE=1"); \
> builtin_define ("_FILE_OFFSET_BITS=64"); \
this will not work, unfortunately: glibc’s <fts.h> refuses to work with LFS.
But why are *new* ports supporting nōn-LFS at all anyway? Just define off_t as
long long int on *all* new architectures, similar how it’s done with 64-bit
time_t for new ILP32 arches… and similar to how the BSDs all operate as well
(off_t is a quad there, period; this with my MirBSD developer hat).
Sorry for being late to this discussion, just found this from
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916276 via
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970460 and having seen this
impact Debian. (Current hat: Debian Developer)
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
2019-05-01 20:33 ` [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user chewi at gentoo dot org
2020-09-17 21:42 ` tg at mirbsd dot de
@ 2020-10-02 8:54 ` danny.milo at gmail dot com
2020-10-02 9:36 ` danny.milo at gmail dot com
` (18 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: danny.milo at gmail dot com @ 2020-10-02 8:54 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
Danny Milosavljevic <danny.milo at gmail dot com> changed:
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--- Comment #58 from Danny Milosavljevic <danny.milo at gmail dot com> ---
The title should be changed to be more general because this does not only break
qemu-user. In fact, mentioning qemu would make it seem that it can be fixed in
qemu-user--which it can't.
The same happens on aarch64 if running armhf executables (no qemu anywhere).
More details on
https://lists.gnu.org/archive/html/guix-patches/2020-10/msg00059.html .
In order to test, patch fuse-2.9.9 like this:
diff -ru orig/fuse-2.9.9/lib/fuse_lowlevel.c fuse-2.9.9/lib/fuse_lowlevel.c
--- orig/fuse-2.9.9/lib/fuse_lowlevel.c 1970-01-01 01:00:01.000000000 +0100
+++ fuse-2.9.9/lib/fuse_lowlevel.c 2020-09-25 17:09:26.744879224 +0200
@@ -257,7 +257,7 @@
struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
dirent->ino = stbuf->st_ino;
- dirent->off = off;
+ dirent->off = off | 0x1234567890123;
dirent->namelen = namelen;
dirent->type = (stbuf->st_mode & 0170000) >> 12;
strncpy(dirent->name, name, namelen);
Then run make.
mkdir -p /tmp/foo
Then invoke:
examples/hello_ll /tmp/foo
Then run this test program:
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <dirent.h>
#if defined( __ILP32__)
#warning ILP32
#endif
int main() {
DIR* d;
struct dirent* ent;
d = opendir("/tmp/foo");
if (d == NULL) {
perror("opendir");
return 1;
}
errno = 0;
assert(sizeof(ent->d_off) == sizeof(off_t));
while ((ent = readdir(d)) != NULL) {
printf("%llX %s\n", (unsigned long long) ent->d_off,
ent->d_name);
if (ent->d_off > 0xffffffff)
printf("BIG\n");
}
if (errno)
perror("readdir");
return sizeof(off_t);
}
Compile once with -D_FILE_OFFSET_BITS=64, once with -D_FILE_OFFSET_BITS=32 and
once with no -D_FILE_OFFSET_BITS.
You get this result:
system _FILE_OFFSET_BITS off_t d_off-sizeof d_off-values
---------------------------------------------------------------
x86_64 - 8 Byte 8 Byte 8 Byte
i686 - 4 Byte 4 Byte 4 Byte
i686 64 8 Byte 8 Byte FAIL*
i686 32 4 Byte 4 Byte FAIL*
armhf - 4 Byte 4 Byte FAIL*
armhf 64 8 Byte 8 Byte 8 Byte
armhf 32 4 Byte 4 Byte FAIL*
a64armhf - 4 Byte 4 Byte FAIL*
a64armhf 64 8 Byte 8 Byte 8 Byte
a64armhf 32 4 Byte 4 Byte FAIL*
aarch64 - 8 Byte 8 Byte 8 Byte
*: Using FUSE filesystem with big d_off value.
None of those tests were done with qemu. They were all native.
"i686" means "i686 on x86_64".
I argue that the only safe way to fix that once and for all is to use
_FILE_OFFSET_BITS=64 on 32 bits.
I would implore glibc maintainers to mandate choosing a _FILE_OFFSET_BITS and
fail compilation otherwise. 15 years of migration to LFS is more than enough.
Patch to do that: At the end of dirent.h, add:
#ifndef _LIBC
#if __SIZEOF_LONG__ < 8
#ifndef __USE_FILE_OFFSET64
#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 32
#warning \"Using -D_FILE_OFFSET_BITS=32 and using readdir is a bad idea, see
<https://bugzilla.kernel.org/show_bug.cgi?id=205957>\"
#else
#undef readdir
#define readdir @READDIR_WITHOUT_FILE_OFFSET64_IS_A_REALLY_BAD_IDEA@
#endif
#endif
#endif
#endif
And then in posix/glob.c at the beginning:
#undef readdir
This makes it much easier for distributions to find the problem.
Otherwise the problem would be hidden in the sense that a lot of programs
COMPILE just fine without _FILE_OFFSET_BITS--but they fail at runtime in
unexpected ways.
Unexpected because they usually don't fail right away at runtime but only on
the first strange readdir result. A strange readdir result is one where d_off
> 2**32 but it doesn't fit into the d_off slot.
Worse, a lot of clients do not check errno and just leave all the other files
of that directory out once that happens. When the strange readdir result
appears depends on filesystem internals.
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (2 preceding siblings ...)
2020-10-02 8:54 ` danny.milo at gmail dot com
@ 2020-10-02 9:36 ` danny.milo at gmail dot com
2020-10-02 9:46 ` fweimer at redhat dot com
` (17 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: danny.milo at gmail dot com @ 2020-10-02 9:36 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #59 from Danny Milosavljevic <danny.milo at gmail dot com> ---
(In reply to Adhemerval Zanella from comment #32)
> I am not against in reverting back to use SYS_getdents for getdents64
SYS_getdents has 32 bit slots, including d_off, in the result and thus the
kernel cannot tell you the truth in the result. Having the kernel paper over
this seems unwise--this would be/is basically the kernel lying to you. As with
all lies, the kernel then has to keep some kind of table which lies it told to
whom and be consistent with them. Why do that?
> although it is a subpar resolution for a kernel issue. Newer architectures
> with mixed 32 and 64 bits support will continue to be broken without a
> proper kernel fix since they use SYS_getdents64 for getdents.
The kernel is the wrong place to work around this. glibc should be using 64
bit struct dirent so it can actually handle the truth.
> What I think we should do is:
>
> 1. *Deprecate* non-LFS usage in a multi-step way as discussed in
> libc-alpha [1]. We will need to take care of the issue brought by Joseph,
> but it will mean eventually the non-LFS interfaces will be just provided as
> compatibility symbols.
I agree.
> 2. Push to distro on 32-bits to *stop* building packages in non-LFS mode
> as default. Some distro already gets this right, but it seems some still
> lacking support.
For that to happen, please make glibc at least emit a warning--although with a
problem this bad, I'd prefer an error--if _FILE_OFFSET_BITS != 64 and
SIZEOF_LONG < 8 and readdir is used.
I use this in dirent.h:
#ifndef _LIBC
#if __SIZEOF_LONG__ < 8
#ifndef __USE_FILE_OFFSET64
#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 32
#warning \"Using -D_FILE_OFFSET_BITS=32 and using readdir is a bad idea, see
<https://bugzilla.kernel.org/show_bug.cgi?id=205957>\"
#else
#undef readdir
#define readdir @READDIR_WITHOUT_FILE_OFFSET64_IS_A_REALLY_BAD_IDEA@
#endif
#endif
#endif
#endif
It's much better to find problems this way than to have programs fail at random
times at runtime depending on file system internals.
Or use gcc's "deprecated" attribute on readdir, with a message, in order to at
least warn. But, really, does this sound like something harmless enough to
only warn? It does not to me.
> 3. Continue to push kernel developers to provide a correct fix for this
> issue.
We shouldn't do that in the kernel (see beginning of this text).
It's impossible to store a 64 bit result into a 32 bit slot.
Also, if you call SYS_getdents64, you should expect a 64 bit result. It's in
the name.
Please don't use SYS_getdents. Just please mandate LFS instead. This should
have been done long (decades) ago.
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (3 preceding siblings ...)
2020-10-02 9:36 ` danny.milo at gmail dot com
@ 2020-10-02 9:46 ` fweimer at redhat dot com
2020-10-02 10:41 ` danny.milo at gmail dot com
` (16 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: fweimer at redhat dot com @ 2020-10-02 9:46 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #60 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Danny Milosavljevic from comment #59)
> It's impossible to store a 64 bit result into a 32 bit slot.
You can do something like that if you can maintain a translation table. The
kernel cannot do it due to the way the getdents64 system call works. glibc can
do it for telldir/seekdir (allocating table slots on demand), which are the
interfaces that are actually problematic.
> Please don't use SYS_getdents. Just please mandate LFS instead. This should have been done long (decades) ago.
LFS does not change the return type of telldir. So it does not fix the issue.
We need to maintain a translation table for telldir and seekdir in DIR. It can
be filled on demand, so that applications that do not call telldir are pretty
much unaffected. The only thing that is a bit tricky is that we have to
pre-allocate the slot during readdir because telldir must not fail.
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[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (4 preceding siblings ...)
2020-10-02 9:46 ` fweimer at redhat dot com
@ 2020-10-02 10:41 ` danny.milo at gmail dot com
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21 siblings, 0 replies; 22+ messages in thread
From: danny.milo at gmail dot com @ 2020-10-02 10:41 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #61 from Danny Milosavljevic <danny.milo at gmail dot com> ---
(In reply to Florian Weimer from comment #60)
> (In reply to Danny Milosavljevic from comment #59)
> > It's impossible to store a 64 bit result into a 32 bit slot.
>
> You can do something like that if you can maintain a translation table. The
> kernel cannot do it due to the way the getdents64 system call works. glibc
> can do it for telldir/seekdir (allocating table slots on demand), which are
> the interfaces that are actually problematic.
> LFS does not change the return type of telldir.
>So it does not fix the issue.
I know what you mean. Given the seekdir and telldir interface as it is now,
mandating LFS does not fix telldir and seekdir, because they use "long", not
"off_t".
The correct solution is to change the POSIX standard, too. Short term, that
won't be done. But it still SHOULD be done.
In the mean time, I agree, you could make a mapping table for the rare cases
where telldir and seekdir are actually used. The question is where to store
the latest (64 bit) d_off in the mean time (until telldir is called and you
need it)...
However, the current practical problem is much worse:
32 bit apps on 64 bits cannot reliably call *readdir* without using LFS. So
far, Guix distribution has had to patch: gcc's libstdc++-v3, libidn2,
fontconfig, libtasn1, openssl, libtool/libltdl, rhash, cmake-bootstrap, cmake,
cyrus-sasl in order to even be able to *compile any end user program* as a
distribution using cmake. That had broken the entire distribution on 32 bit,
to the point I'm now asking to remove 32 bit support entirely from our
homepage.
Just to be clear, that is *without* using qemu.
This problem affects even 32 bit distributions without LFS on 32 bit kernels
(that is not a typo)!
And if you enable LFS, it totally works fine in practice.
I estimate that compared to that, seekdir users are few. And I agree that
those users still have a problem even after enabling LFS.
> We need to maintain a translation table for telldir and seekdir in
> DIR. It can be filled on demand, so that applications that do not call
> telldir are pretty much unaffected. The only thing that is a bit tricky is
> that we have to pre-allocate the slot during readdir because telldir must
> not fail.
I argue the easiest fixing step to do is still to mandate LFS.
Then glibc works in practice. Without, it *really* does not work--even in
theory.
But sure, also put workarounds into telldir and seekdir. If possible. Is it
possible?
(readdir has been broken the last few glibc releases--I had thought it was my
imagination that the compilation of gcc would always be stuck in an endless
loop on armhf--but now it all makes sense).
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (5 preceding siblings ...)
2020-10-02 10:41 ` danny.milo at gmail dot com
@ 2020-10-02 11:03 ` danny.milo at gmail dot com
2020-10-02 13:17 ` jrtc27 at jrtc27 dot com
` (14 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: danny.milo at gmail dot com @ 2020-10-02 11:03 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #62 from Danny Milosavljevic <danny.milo at gmail dot com> ---
(In reply to Florian Weimer from comment #60)
> (In reply to Danny Milosavljevic from comment #59)
> > It's impossible to store a 64 bit result into a 32 bit slot.
>
> You can do something like that if you can maintain a translation table.
Mathematically speaking, no, you can't. There cannot be a 1:1 mapping between
all 64 bit values and all 32 bit values.
I know what you mean--in practice it could be good enough, if the directory
doesn't have too many entries (or, depending on implementation, telldir isn't
called too often--though first that implementation with only telldir doing the
counting has to be possible. Is it?).
But that's just kicking the can down the road--eventually, someone somewhere
will have that many entries. And then, the mapping will fail.
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` (6 preceding siblings ...)
2020-10-02 11:03 ` danny.milo at gmail dot com
@ 2020-10-02 13:17 ` jrtc27 at jrtc27 dot com
2020-10-02 14:22 ` adhemerval.zanella at linaro dot org
` (13 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: jrtc27 at jrtc27 dot com @ 2020-10-02 13:17 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #63 from Jessica Clarke <jrtc27 at jrtc27 dot com> ---
(In reply to Danny Milosavljevic from comment #62)
> (In reply to Florian Weimer from comment #60)
> > (In reply to Danny Milosavljevic from comment #59)
> > > It's impossible to store a 64 bit result into a 32 bit slot.
> >
> > You can do something like that if you can maintain a translation table.
>
> Mathematically speaking, no, you can't. There cannot be a 1:1 mapping
> between all 64 bit values and all 32 bit values.
>
> I know what you mean--in practice it could be good enough, if the directory
> doesn't have too many entries (or, depending on implementation, telldir
> isn't called too often--though first that implementation with only telldir
> doing the counting has to be possible. Is it?).
>
> But that's just kicking the can down the road--eventually, someone somewhere
> will have that many entries. And then, the mapping will fail.
If you have more than 4 billion files then you really should not be using a
32-bit system. That is a very different (if related) problem from a single >4
GiB file. Even https://lwn.net/Articles/400629/ split the 1 billion files up
into 1 thousand directories each with 1 million files.
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (7 preceding siblings ...)
2020-10-02 13:17 ` jrtc27 at jrtc27 dot com
@ 2020-10-02 14:22 ` adhemerval.zanella at linaro dot org
2020-10-02 23:06 ` tg at mirbsd dot de
` (12 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2020-10-02 14:22 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #64 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
> (In reply to Adhemerval Zanella from comment #32)
> > although it is a subpar resolution for a kernel issue. Newer architectures
> > with mixed 32 and 64 bits support will continue to be broken without a
> > proper kernel fix since they use SYS_getdents64 for getdents.
>
> The kernel is the wrong place to work around this. glibc should be using 64
> bit struct dirent so it can actually handle the truth.
I agree and this an overlook from we glibc maintainers to allow newer 32-bit
ABIs to support non-LFS interface. Current pratice now is to enforce 64-bit
off_t for all newer ABIs (for instance as done for arc and riscv32).
However, there are still legacy ABIs which supports non-LFS and even one that
support without having the legacy kernel interface (nios2 and csky for
instance).
>
> > What I think we should do is:
> >
> > 1. *Deprecate* non-LFS usage in a multi-step way as discussed in
> > libc-alpha [1]. We will need to take care of the issue brought by Joseph,
> > but it will mean eventually the non-LFS interfaces will be just provided as
> > compatibility symbols.
>
> I agree.
>
> > 2. Push to distro on 32-bits to *stop* building packages in non-LFS mode
> > as default. Some distro already gets this right, but it seems some still
> > lacking support.
>
> For that to happen, please make glibc at least emit a warning--although with
> a problem this bad, I'd prefer an error--if _FILE_OFFSET_BITS != 64 and
> SIZEOF_LONG < 8 and readdir is used.
>
> I use this in dirent.h:
>
> #ifndef _LIBC
> #if __SIZEOF_LONG__ < 8
> #ifndef __USE_FILE_OFFSET64
> #if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 32
> #warning \"Using -D_FILE_OFFSET_BITS=32 and using readdir is a bad idea, see
> <https://bugzilla.kernel.org/show_bug.cgi?id=205957>\"
> #else
> #undef readdir
> #define readdir @READDIR_WITHOUT_FILE_OFFSET64_IS_A_REALLY_BAD_IDEA@
> #endif
> #endif
> #endif
> #endif
>
> It's much better to find problems this way than to have programs fail at
> random times at runtime depending on file system internals.
>
> Or use gcc's "deprecated" attribute on readdir, with a message, in order to
> at least warn. But, really, does this sound like something harmless enough
> to only warn? It does not to me.
This is quite disruptive and with potentialy breakage in a lot of scenarios. As
suggested by Joseph [1], we need to make it more seamlessly over multiple
releases. We already have the bug tracer to make 64-bit LFS default (BZ#13047),
but we also need to take care of BZ#14106, BZ#15766, and glibc build/tests
itself.
What I would like to get on 2.33 is to move ld.so and libc.so to use non-LFS
internally first by using explicit *64 interface. It will make build glibc
itself with default LFS easier.
The point that will require a *lot* of work is to check and adapt the testcases
to systematically check for all LFS interfaces in the various modes.
>
> > 3. Continue to push kernel developers to provide a correct fix for this
> > issue.
>
> We shouldn't do that in the kernel (see beginning of this text).
>
> It's impossible to store a 64 bit result into a 32 bit slot.
>
> Also, if you call SYS_getdents64, you should expect a 64 bit result. It's
> in the name.
>
> Please don't use SYS_getdents. Just please mandate LFS instead. This
> should have been done long (decades) ago.
I am not inclined to keep using non-LFS internally, ideally I would like to
remove *all* non-LFS usage even on non-LFS symbols. It would be similar to
work done on y2038 support, with the advantage that it won't need to handle
ENOSYS and add non-LFS fallback (we will just need to handel overflow as some
ABIs do with 'generic' internal interfaces).
And I have a working solution for this issue [1]. I did not get much review on
my last try [3], but debian and gentoo developers told me that it has fixed
their issues on both qemu and bootstrap.
The bulk of the change is:
--
It allows to obtain the expected entry offset on telldir and set
it correctly on seekdir on platforms where long int is smaller
than off64_t.
On such cases telldir will mantain an internal list that maps the
DIR object off64_t offsets to the returned long int (the function
return value). The seekdir will then set the correct offset from
the internal list using the telldir as the list key.
It also removes the overflow check on readdir and the returned value
will be truncated by the non-LFS off_t size. As Joseph has noted
in BZ #23960 comment #22, d_off is an opaque value and since
telldir/seekdir works regardless of the returned dirent d_off value.
Finally it removed the requirement to check for overflow values on
telldir (BZ #24050).
--
And Florian has raised some question about making 'telldir' fails. The standard
does not really allow it, but I think it is feasible concession to deprecated
interface.
I will commit the first two patches, they have been acked on previous
iterations (they are mainly refactoring and some interfaces fixes) and send
remmaining ones to review. Maybe we get them on 2.33 and we can backport if
required.
[1] https://sourceware.org/legacy-ml/libc-alpha/2019-01/msg00124.html
[2]
https://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/azanella/bz23960
[3] https://sourceware.org/pipermail/libc-alpha/2020-April/112866.html
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` (8 preceding siblings ...)
2020-10-02 14:22 ` adhemerval.zanella at linaro dot org
@ 2020-10-02 23:06 ` tg at mirbsd dot de
2020-10-03 13:54 ` fweimer at redhat dot com
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21 siblings, 0 replies; 22+ messages in thread
From: tg at mirbsd dot de @ 2020-10-02 23:06 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #65 from Thorsten Glaser <tg at mirbsd dot de> ---
>I agree and this an overlook from we glibc maintainers to allow newer
>32-bit ABIs to support non-LFS interface.
Indeed. (Again, from a BSD PoV, wondering why this is so at all.)
>Current pratice now is to enforce 64-bit
>off_t for all newer ABIs (for instance as done for arc and riscv32).
Good.
>However, there are still legacy ABIs which supports non-LFS and even
>one that support without having the legacy kernel interface (nios2 and
>csky for instance).
Ouch. That’s going to be tricky to fix.
But enabling LFS on architectures that support nōn-LFS
breaks <fts.h> so it’s not a generally usable fix either.
----
>In the mean time, I agree, you could make a mapping table for the rare
>cases where telldir and seekdir are actually used.
Can you make the linker choose a readdir implementation
based on the presence of any of telldir and seekdir?
Perhaps something with putting a readdir that just does
its job, declared weak, into one archive, and a single .o
containing telldir, seekdir, and a readdir that also
maps 64-bit to 32-bit values into another, so that the
latter is only chosen if telldir/seekdir are actually
called? (AIUI it’s even only needed if *seek*dir is
actually called, right?)
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` (9 preceding siblings ...)
2020-10-02 23:06 ` tg at mirbsd dot de
@ 2020-10-03 13:54 ` fweimer at redhat dot com
2020-10-03 13:55 ` fweimer at redhat dot com
` (10 subsequent siblings)
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From: fweimer at redhat dot com @ 2020-10-03 13:54 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #66 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Danny Milosavljevic from comment #62)
> (In reply to Florian Weimer from comment #60)
> > (In reply to Danny Milosavljevic from comment #59)
> > > It's impossible to store a 64 bit result into a 32 bit slot.
> >
> > You can do something like that if you can maintain a translation table.
>
> Mathematically speaking, no, you can't. There cannot be a 1:1 mapping
> between all 64 bit values and all 32 bit values.
>
> I know what you mean--in practice it could be good enough, if the directory
> doesn't have too many entries (or, depending on implementation, telldir
> isn't called too often--though first that implementation with only telldir
> doing the counting has to be possible. Is it?).
>
> But that's just kicking the can down the road--eventually, someone somewhere
> will have that many entries. And then, the mapping will fail.
Most Linux file systems use some hash-based approach, so that they do not have
to maintain a separate lookup table for seeking in directories. A simple offset
does not work because there are POSIX (and quality-of-implementation)
requirements that after seekdir, the same sequence of entries is produced even
if unrelated directory entries are created and removed. Because of the hashing
involved, directories with tens of millions of entries may run into problems
even with a 64-bit hash.
If a file system uses a separate data structure for directory seeking, it won't
have a problem to generate 30-bit offsets, in which case glibc could avoid
translation completely (if it reserves the offsets in the range INT_MAX/2 + 1 …
INT_MAX for translation, which should be large enough).
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` (10 preceding siblings ...)
2020-10-03 13:54 ` fweimer at redhat dot com
@ 2020-10-03 13:55 ` fweimer at redhat dot com
2021-08-24 11:48 ` glaubitz at physik dot fu-berlin.de
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From: fweimer at redhat dot com @ 2020-10-03 13:55 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #67 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Thorsten Glaser from comment #65)
> Can you make the linker choose a readdir implementation
> based on the presence of any of telldir and seekdir?
I don't think glibc should add complexity to optimize static linking on 32-bit
platforms. There are other libcs that have that as their area of expertise.
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` (11 preceding siblings ...)
2020-10-03 13:55 ` fweimer at redhat dot com
@ 2021-08-24 11:48 ` glaubitz at physik dot fu-berlin.de
2022-05-15 20:53 ` glaubitz at physik dot fu-berlin.de
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From: glaubitz at physik dot fu-berlin.de @ 2021-08-24 11:48 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #68 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
Just as a heads-up to anyone stumbling over this bug report, the latest set of
patches addressing the issue can be found here:
> https://sourceware.org/pipermail/libc-alpha/2020-October/118883.html
I have been using these patches without any issues on Debian for m68k and sh4.
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (12 preceding siblings ...)
2021-08-24 11:48 ` glaubitz at physik dot fu-berlin.de
@ 2022-05-15 20:53 ` glaubitz at physik dot fu-berlin.de
2022-05-16 12:06 ` adhemerval.zanella at linaro dot org
` (7 subsequent siblings)
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From: glaubitz at physik dot fu-berlin.de @ 2022-05-15 20:53 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #69 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
For anyone else running into this problem:
The issue can be worked around by putting the target chroot onto a btrfs
filesystem.
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
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` (13 preceding siblings ...)
2022-05-15 20:53 ` glaubitz at physik dot fu-berlin.de
@ 2022-05-16 12:06 ` adhemerval.zanella at linaro dot org
2022-05-16 20:11 ` glaubitz at physik dot fu-berlin.de
` (6 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2022-05-16 12:06 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #70 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to John Paul Adrian Glaubitz from comment #69)
> For anyone else running into this problem:
>
> The issue can be worked around by putting the target chroot onto a btrfs
> filesystem.
Does it still fail with my patches applied?
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (14 preceding siblings ...)
2022-05-16 12:06 ` adhemerval.zanella at linaro dot org
@ 2022-05-16 20:11 ` glaubitz at physik dot fu-berlin.de
2022-05-16 20:15 ` adhemerval.zanella at linaro dot org
` (5 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: glaubitz at physik dot fu-berlin.de @ 2022-05-16 20:11 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #71 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Adhemerval Zanella from comment #70)
> (In reply to John Paul Adrian Glaubitz from comment #69)
> > For anyone else running into this problem:
> >
> > The issue can be worked around by putting the target chroot onto a btrfs
> > filesystem.
>
> Does it still fail with my patches applied?
It used to work with your patches, but that no longer seems to be the case
which I find strange.
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
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` (15 preceding siblings ...)
2022-05-16 20:11 ` glaubitz at physik dot fu-berlin.de
@ 2022-05-16 20:15 ` adhemerval.zanella at linaro dot org
2022-05-17 4:39 ` sam at gentoo dot org
` (4 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2022-05-16 20:15 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #72 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to John Paul Adrian Glaubitz from comment #71)
> (In reply to Adhemerval Zanella from comment #70)
> > (In reply to John Paul Adrian Glaubitz from comment #69)
> > > For anyone else running into this problem:
> > >
> > > The issue can be worked around by putting the target chroot onto a btrfs
> > > filesystem.
> >
> > Does it still fail with my patches applied?
>
> It used to work with your patches, but that no longer seems to be the case
> which I find strange.
Do you have any information of what might be failing? It would be good to know
if this is another non-LFS interface pitfall.
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (16 preceding siblings ...)
2022-05-16 20:15 ` adhemerval.zanella at linaro dot org
@ 2022-05-17 4:39 ` sam at gentoo dot org
2022-12-06 15:50 ` glaubitz at physik dot fu-berlin.de
` (3 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: sam at gentoo dot org @ 2022-05-17 4:39 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
Sam James <sam at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sam at gentoo dot org,
| |toolchain at gentoo dot org
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (17 preceding siblings ...)
2022-05-17 4:39 ` sam at gentoo dot org
@ 2022-12-06 15:50 ` glaubitz at physik dot fu-berlin.de
2023-01-13 4:52 ` deller at gmx dot de
` (2 subsequent siblings)
21 siblings, 0 replies; 22+ messages in thread
From: glaubitz at physik dot fu-berlin.de @ 2022-12-06 15:50 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
--- Comment #73 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Adhemerval Zanella from comment #72)
> (In reply to John Paul Adrian Glaubitz from comment #71)
> > (In reply to Adhemerval Zanella from comment #70)
> > > (In reply to John Paul Adrian Glaubitz from comment #69)
> > > > For anyone else running into this problem:
> > > >
> > > > The issue can be worked around by putting the target chroot onto a btrfs
> > > > filesystem.
> > >
> > > Does it still fail with my patches applied?
> >
> > It used to work with your patches, but that no longer seems to be the case
> > which I find strange.
>
> Do you have any information of what might be failing? It would be good to
> know if this is another non-LFS interface pitfall.
I can only say at the moment that it occurs with Java applications even with
your patches applied.
For example, when running the "ant" command inside an emulated m68k chroot, I
am getting the following error:
root@nofan:/# ant -version
Failed to locateorg.apache.tools.ant.Main
ant.home: /usr/share/ant
Classpath: /usr/share/ant/lib/ant-launcher.jar
Launcher JAR: /usr/share/java/ant-launcher-1.10.12.jar
Launcher Directory: /usr/share/java
root@nofan:/#
When working correctly - which is the case on btrfs and xfs, for example - the
output looks like this:
(sid-m68k-sbuild)root@z6:/# ant -version
Apache Ant(TM) version 1.10.12 compiled on July 11 2022
(sid-m68k-sbuild)root@z6:/#
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (18 preceding siblings ...)
2022-12-06 15:50 ` glaubitz at physik dot fu-berlin.de
@ 2023-01-13 4:52 ` deller at gmx dot de
2023-12-29 23:52 ` sam at gentoo dot org
2024-01-05 8:33 ` sam at gentoo dot org
21 siblings, 0 replies; 22+ messages in thread
From: deller at gmx dot de @ 2023-01-13 4:52 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
Helge Deller <deller at gmx dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |deller at gmx dot de
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
[not found] <bug-23960-131@http.sourceware.org/bugzilla/>
` (19 preceding siblings ...)
2023-01-13 4:52 ` deller at gmx dot de
@ 2023-12-29 23:52 ` sam at gentoo dot org
2024-01-05 8:33 ` sam at gentoo dot org
21 siblings, 0 replies; 22+ messages in thread
From: sam at gentoo dot org @ 2023-12-29 23:52 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
Sam James <sam at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=31186
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* [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user
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` (20 preceding siblings ...)
2023-12-29 23:52 ` sam at gentoo dot org
@ 2024-01-05 8:33 ` sam at gentoo dot org
21 siblings, 0 replies; 22+ messages in thread
From: sam at gentoo dot org @ 2024-01-05 8:33 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=23960
Sam James <sam at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=31212
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end of thread, other threads:[~2024-01-05 8:33 UTC | newest]
Thread overview: 22+ messages (download: mbox.gz / follow: Atom feed)
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2019-05-01 20:33 ` [Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user chewi at gentoo dot org
2020-09-17 21:42 ` tg at mirbsd dot de
2020-10-02 8:54 ` danny.milo at gmail dot com
2020-10-02 9:36 ` danny.milo at gmail dot com
2020-10-02 9:46 ` fweimer at redhat dot com
2020-10-02 10:41 ` danny.milo at gmail dot com
2020-10-02 11:03 ` danny.milo at gmail dot com
2020-10-02 13:17 ` jrtc27 at jrtc27 dot com
2020-10-02 14:22 ` adhemerval.zanella at linaro dot org
2020-10-02 23:06 ` tg at mirbsd dot de
2020-10-03 13:54 ` fweimer at redhat dot com
2020-10-03 13:55 ` fweimer at redhat dot com
2021-08-24 11:48 ` glaubitz at physik dot fu-berlin.de
2022-05-15 20:53 ` glaubitz at physik dot fu-berlin.de
2022-05-16 12:06 ` adhemerval.zanella at linaro dot org
2022-05-16 20:11 ` glaubitz at physik dot fu-berlin.de
2022-05-16 20:15 ` adhemerval.zanella at linaro dot org
2022-05-17 4:39 ` sam at gentoo dot org
2022-12-06 15:50 ` glaubitz at physik dot fu-berlin.de
2023-01-13 4:52 ` deller at gmx dot de
2023-12-29 23:52 ` sam at gentoo dot org
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