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* [Bug nptl/26248] New: Incorrect argument types for INLINE_SETXID_SYSCALL
@ 2020-07-16 2:53 hjl.tools at gmail dot com
2020-07-16 8:24 ` [Bug nptl/26248] " fweimer at redhat dot com
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: hjl.tools at gmail dot com @ 2020-07-16 2:53 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26248
Bug ID: 26248
Summary: Incorrect argument types for INLINE_SETXID_SYSCALL
Product: glibc
Version: 2.32
Status: NEW
Severity: normal
Priority: P2
Component: nptl
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
nptl has
/* Opcodes and data types for communication with the signal handler to
change user/group IDs. */
struct xid_command
{
int syscall_no;
long int id[3];
volatile int cntr;
volatile int error; /* -1: no call yet, 0: success seen, >0: error seen. */
};
/* This must be last, otherwise the current thread might not have
permissions to send SIGSETXID syscall to the other threads. */
result = INTERNAL_SYSCALL_NCS (cmdp->syscall_no, 3,
cmdp->id[0], cmdp->id[1], cmdp->id[2]);
But arguments of some SETXID syscals are pointers:
int setgroups(size_t size, const gid_t *list);
which aren't handled properly.
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* [Bug nptl/26248] Incorrect argument types for INLINE_SETXID_SYSCALL
2020-07-16 2:53 [Bug nptl/26248] New: Incorrect argument types for INLINE_SETXID_SYSCALL hjl.tools at gmail dot com
@ 2020-07-16 8:24 ` fweimer at redhat dot com
2020-07-16 8:36 ` aurelien at aurel32 dot net
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: fweimer at redhat dot com @ 2020-07-16 8:24 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26248
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fweimer at redhat dot com
--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
Is the issue that pointers-as-long are incorrectly sign-extended on x32?
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* [Bug nptl/26248] Incorrect argument types for INLINE_SETXID_SYSCALL
2020-07-16 2:53 [Bug nptl/26248] New: Incorrect argument types for INLINE_SETXID_SYSCALL hjl.tools at gmail dot com
2020-07-16 8:24 ` [Bug nptl/26248] " fweimer at redhat dot com
@ 2020-07-16 8:36 ` aurelien at aurel32 dot net
2020-07-16 8:37 ` aurelien at aurel32 dot net
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: aurelien at aurel32 dot net @ 2020-07-16 8:36 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26248
Aurelien Jarno <aurelien at aurel32 dot net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aurelien at aurel32 dot net
--- Comment #2 from Aurelien Jarno <aurelien at aurel32 dot net> ---
Created attachment 12703
--> https://sourceware.org/bugzilla/attachment.cgi?id=12703&action=edit
Reproducer for the issue
Please find attached a small reproducer for the issue. Compile it with "gcc
-mx32 -o setgroups-x32 setgroups-x32.c -lpthread". Running it as root returns:
# ./setgroups-x32
setgroups failed: Bad address
It runs successfully with commit df76ff3a446a787a95cf74cb15c285464d73a93d
reverted.
(Note that this commit has been backported in 2.30 and 2.31).
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* [Bug nptl/26248] Incorrect argument types for INLINE_SETXID_SYSCALL
2020-07-16 2:53 [Bug nptl/26248] New: Incorrect argument types for INLINE_SETXID_SYSCALL hjl.tools at gmail dot com
2020-07-16 8:24 ` [Bug nptl/26248] " fweimer at redhat dot com
2020-07-16 8:36 ` aurelien at aurel32 dot net
@ 2020-07-16 8:37 ` aurelien at aurel32 dot net
2020-07-16 11:29 ` hjl.tools at gmail dot com
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: aurelien at aurel32 dot net @ 2020-07-16 8:37 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26248
Aurelien Jarno <aurelien at aurel32 dot net> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |https://bugs.debian.org/cgi
| |-bin/bugreport.cgi?bug=9650
| |91
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* [Bug nptl/26248] Incorrect argument types for INLINE_SETXID_SYSCALL
2020-07-16 2:53 [Bug nptl/26248] New: Incorrect argument types for INLINE_SETXID_SYSCALL hjl.tools at gmail dot com
` (2 preceding siblings ...)
2020-07-16 8:37 ` aurelien at aurel32 dot net
@ 2020-07-16 11:29 ` hjl.tools at gmail dot com
2020-08-18 10:04 ` schwab@linux-m68k.org
2020-08-18 13:04 ` carlos at redhat dot com
5 siblings, 0 replies; 7+ messages in thread
From: hjl.tools at gmail dot com @ 2020-07-16 11:29 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26248
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |2.32
Assignee|unassigned at sourceware dot org |hjl.tools at gmail dot com
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
A patch is posted at
https://sourceware.org/pipermail/libc-alpha/2020-July/116388.html
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* [Bug nptl/26248] Incorrect argument types for INLINE_SETXID_SYSCALL
2020-07-16 2:53 [Bug nptl/26248] New: Incorrect argument types for INLINE_SETXID_SYSCALL hjl.tools at gmail dot com
` (3 preceding siblings ...)
2020-07-16 11:29 ` hjl.tools at gmail dot com
@ 2020-08-18 10:04 ` schwab@linux-m68k.org
2020-08-18 13:04 ` carlos at redhat dot com
5 siblings, 0 replies; 7+ messages in thread
From: schwab@linux-m68k.org @ 2020-08-18 10:04 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26248
--- Comment #4 from Andreas Schwab <schwab@linux-m68k.org> ---
Is this fixed already?
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* [Bug nptl/26248] Incorrect argument types for INLINE_SETXID_SYSCALL
2020-07-16 2:53 [Bug nptl/26248] New: Incorrect argument types for INLINE_SETXID_SYSCALL hjl.tools at gmail dot com
` (4 preceding siblings ...)
2020-08-18 10:04 ` schwab@linux-m68k.org
@ 2020-08-18 13:04 ` carlos at redhat dot com
5 siblings, 0 replies; 7+ messages in thread
From: carlos at redhat dot com @ 2020-08-18 13:04 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26248
Carlos O'Donell <carlos at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
CC| |carlos at redhat dot com
Status|NEW |RESOLVED
--- Comment #5 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Andreas Schwab from comment #4)
> Is this fixed already?
Yes, fixed with this:
commit 0ad926f34937f7b4843a8b49e5d93199601fe324
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Jul 16 03:37:10 2020 -0700
nptl: Zero-extend arguments to SETXID syscalls [BZ #26248]
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2020-07-16 2:53 [Bug nptl/26248] New: Incorrect argument types for INLINE_SETXID_SYSCALL hjl.tools at gmail dot com
2020-07-16 8:24 ` [Bug nptl/26248] " fweimer at redhat dot com
2020-07-16 8:36 ` aurelien at aurel32 dot net
2020-07-16 8:37 ` aurelien at aurel32 dot net
2020-07-16 11:29 ` hjl.tools at gmail dot com
2020-08-18 10:04 ` schwab@linux-m68k.org
2020-08-18 13:04 ` carlos at redhat dot com
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