* [Bug dynamic-link/20019] NULL pointer dereference in libc.so.6 IFUNC due to uninitialized GOT
[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
@ 2020-12-28 13:11 ` hjl.tools at gmail dot com
2020-12-28 13:16 ` hjl.tools at gmail dot com
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From: hjl.tools at gmail dot com @ 2020-12-28 13:11 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
--- Comment #22 from H.J. Lu <hjl.tools at gmail dot com> ---
Here is another testcase:
https://sourceware.org/pipermail/libc-alpha/2020-December/121118.html
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^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug dynamic-link/20019] NULL pointer dereference in libc.so.6 IFUNC due to uninitialized GOT
[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
2020-12-28 13:11 ` [Bug dynamic-link/20019] NULL pointer dereference in libc.so.6 IFUNC due to uninitialized GOT hjl.tools at gmail dot com
@ 2020-12-28 13:16 ` hjl.tools at gmail dot com
2021-01-13 20:17 ` hjl.tools at gmail dot com
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From: hjl.tools at gmail dot com @ 2020-12-28 13:16 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |---
Status|RESOLVED |REOPENED
--- Comment #23 from H.J. Lu <hjl.tools at gmail dot com> ---
It can also happen when IFUNC resolver is defined in executable.
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^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug dynamic-link/20019] NULL pointer dereference in libc.so.6 IFUNC due to uninitialized GOT
[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
2020-12-28 13:11 ` [Bug dynamic-link/20019] NULL pointer dereference in libc.so.6 IFUNC due to uninitialized GOT hjl.tools at gmail dot com
2020-12-28 13:16 ` hjl.tools at gmail dot com
@ 2021-01-13 20:17 ` hjl.tools at gmail dot com
2021-01-13 23:28 ` hjl.tools at gmail dot com
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From: hjl.tools at gmail dot com @ 2021-01-13 20:17 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |NEW
--- Comment #24 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for 2.33 by
commit 6ea5b57afa5cdc9ce367d2b69a2cebfb273e4617
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Dec 28 05:28:49 2020 -0800
x86: Check IFUNC definition in unrelocated executable [BZ #20019]
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[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
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2021-01-13 20:17 ` hjl.tools at gmail dot com
@ 2021-01-13 23:28 ` hjl.tools at gmail dot com
2021-03-11 2:34 ` yangyanchao6 at huawei dot com
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From: hjl.tools at gmail dot com @ 2021-01-13 23:28 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #25 from H.J. Lu <hjl.tools at gmail dot com> ---
Also fixed on 2.32/2.31/2.30/2.29/2.28 branches.
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[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
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2021-01-13 23:28 ` hjl.tools at gmail dot com
@ 2021-03-11 2:34 ` yangyanchao6 at huawei dot com
2021-03-11 3:07 ` hjl.tools at gmail dot com
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From: yangyanchao6 at huawei dot com @ 2021-03-11 2:34 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
yangyanchao6 at huawei dot com <yangyanchao6 at huawei dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |yangyanchao6 at huawei dot com
--- Comment #26 from yangyanchao6 at huawei dot com <yangyanchao6 at huawei dot com> ---
(In reply to H.J. Lu from comment #24)
> Fixed for 2.33 by
>
> commit 6ea5b57afa5cdc9ce367d2b69a2cebfb273e4617
> Author: H.J. Lu <hjl.tools@gmail.com>
> Date: Mon Dec 28 05:28:49 2020 -0800
>
> x86: Check IFUNC definition in unrelocated executable [BZ #20019]
I tried this patch but the problem didn't get fixed.
Is there anything else I need to do?
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[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
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2021-03-11 2:34 ` yangyanchao6 at huawei dot com
@ 2021-03-11 3:07 ` hjl.tools at gmail dot com
2021-03-11 6:24 ` yangyanchao6 at huawei dot com
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From: hjl.tools at gmail dot com @ 2021-03-11 3:07 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
--- Comment #27 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to yangyanchao6@huawei.com from comment #26)
> (In reply to H.J. Lu from comment #24)
> > Fixed for 2.33 by
> >
> > commit 6ea5b57afa5cdc9ce367d2b69a2cebfb273e4617
> > Author: H.J. Lu <hjl.tools@gmail.com>
> > Date: Mon Dec 28 05:28:49 2020 -0800
> >
> > x86: Check IFUNC definition in unrelocated executable [BZ #20019]
>
> I tried this patch but the problem didn't get fixed.
> Is there anything else I need to do?
What problem did you run into?
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^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug dynamic-link/20019] NULL pointer dereference in libc.so.6 IFUNC due to uninitialized GOT
[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
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2021-03-11 3:07 ` hjl.tools at gmail dot com
@ 2021-03-11 6:24 ` yangyanchao6 at huawei dot com
2021-03-11 12:58 ` hjl.tools at gmail dot com
2023-11-24 7:24 ` fweimer at redhat dot com
8 siblings, 0 replies; 9+ messages in thread
From: yangyanchao6 at huawei dot com @ 2021-03-11 6:24 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
--- Comment #28 from yangyanchao6 at huawei dot com <yangyanchao6 at huawei dot com> ---
(In reply to H.J. Lu from comment #27)
> (In reply to yangyanchao6@huawei.com from comment #26)
> > (In reply to H.J. Lu from comment #24)
> > > Fixed for 2.33 by
> > >
> > > commit 6ea5b57afa5cdc9ce367d2b69a2cebfb273e4617
> > > Author: H.J. Lu <hjl.tools@gmail.com>
> > > Date: Mon Dec 28 05:28:49 2020 -0800
> > >
> > > x86: Check IFUNC definition in unrelocated executable [BZ #20019]
> >
> > I tried this patch but the problem didn't get fixed.
> > Is there anything else I need to do?
>
> What problem did you run into?
[root@localhost DTS2021030805K7VLP1D00]# cat bar.c
void
bar (void *dst, void *src)
{
__builtin_memmove (dst, src, 40);
}
[root@localhost DTS2021030805K7VLP1D00]# cat foo.c
void bar (void *dst, void *src);
void
foo (void)
{
char dst[50];
char src[50];
bar (dst, src);
}
[root@localhost DTS2021030805K7VLP1D00]# cat main.c
void foo (void);
int
main ()
{
foo ();
return 0;
}
[root@localhost DTS2021030805K7VLP1D00]# gcc -O2 -c -o main.o main.c
[root@localhost DTS2021030805K7VLP1D00]# gcc -O2 -fPIC -c -o foo.o foo.c
[root@localhost DTS2021030805K7VLP1D00]# gcc -O2 -fPIC -c -o bar.o bar.c
[root@localhost DTS2021030805K7VLP1D00]# ld.gold -shared -z now -o libbar.so
bar.o
[root@localhost DTS2021030805K7VLP1D00]# ld.gold -shared -z now -o libfoo.so
foo.o libbar.so
[root@localhost DTS2021030805K7VLP1D00]# gcc -o foo main.o libfoo.so
-Wl,-rpath,.
[root@localhost DTS2021030805K7VLP1D00]# ./foo
./foo: Relink `./libbar.so' with `/usr/lib64/libc.so.6' for IFUNC symbol
`memmove'
Segmentation fault (core dumped)
[root@localhost DTS2021030805K7VLP1D00]# readelf -r libbar.so
Relocation section '.rela.plt' at offset 0x2b0 contains 1 entry:
Offset Info Type Sym. Value Sym. Name +
Addend
000000001ff8 000100000007 R_X86_64_JUMP_SLO 0000000000000000 memmove + 0
It looks the same as it did before the patch was incorporated.
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[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
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2021-03-11 6:24 ` yangyanchao6 at huawei dot com
@ 2021-03-11 12:58 ` hjl.tools at gmail dot com
2023-11-24 7:24 ` fweimer at redhat dot com
8 siblings, 0 replies; 9+ messages in thread
From: hjl.tools at gmail dot com @ 2021-03-11 12:58 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
--- Comment #29 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to yangyanchao6@huawei.com from comment #28)
> [root@localhost DTS2021030805K7VLP1D00]# gcc -O2 -c -o main.o main.c
> [root@localhost DTS2021030805K7VLP1D00]# gcc -O2 -fPIC -c -o foo.o foo.c
> [root@localhost DTS2021030805K7VLP1D00]# gcc -O2 -fPIC -c -o bar.o bar.c
> [root@localhost DTS2021030805K7VLP1D00]# ld.gold -shared -z now -o
> libbar.so bar.o
> [root@localhost DTS2021030805K7VLP1D00]# ld.gold -shared -z now -o
> libfoo.so foo.o libbar.so
Never use ld directly unless you know what you are getting.
> [root@localhost DTS2021030805K7VLP1D00]# gcc -o foo main.o libfoo.so
> -Wl,-rpath,.
> [root@localhost DTS2021030805K7VLP1D00]# ./foo
> ./foo: Relink `./libbar.so' with `/usr/lib64/libc.so.6' for IFUNC symbol
> `memmove'
> Segmentation fault (core dumped)
> [root@localhost DTS2021030805K7VLP1D00]# readelf -r libbar.so
>
>
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[not found] <bug-20019-131@http.sourceware.org/bugzilla/>
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2021-03-11 12:58 ` hjl.tools at gmail dot com
@ 2023-11-24 7:24 ` fweimer at redhat dot com
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From: fweimer at redhat dot com @ 2023-11-24 7:24 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20019
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=31083
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