* [Bug dynamic-link/20972] Running libc.so.6 as an executable triggers IFUNC relocation ordering issues
[not found] <bug-20972-131@http.sourceware.org/bugzilla/>
@ 2020-10-15 13:38 ` siddhesh at sourceware dot org
2020-11-02 10:08 ` fweimer at redhat dot com
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From: siddhesh at sourceware dot org @ 2020-10-15 13:38 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
Siddhesh Poyarekar <siddhesh at sourceware dot org> changed:
What |Removed |Added
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CC| |siddhesh at sourceware dot org
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^ permalink raw reply [flat|nested] 12+ messages in thread* [Bug dynamic-link/20972] Running libc.so.6 as an executable triggers IFUNC relocation ordering issues
[not found] <bug-20972-131@http.sourceware.org/bugzilla/>
2020-10-15 13:38 ` [Bug dynamic-link/20972] Running libc.so.6 as an executable triggers IFUNC relocation ordering issues siddhesh at sourceware dot org
@ 2020-11-02 10:08 ` fweimer at redhat dot com
2020-11-03 15:16 ` tuliom at ascii dot art.br
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From: fweimer at redhat dot com @ 2020-11-02 10:08 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=26615
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[not found] <bug-20972-131@http.sourceware.org/bugzilla/>
2020-10-15 13:38 ` [Bug dynamic-link/20972] Running libc.so.6 as an executable triggers IFUNC relocation ordering issues siddhesh at sourceware dot org
2020-11-02 10:08 ` fweimer at redhat dot com
@ 2020-11-03 15:16 ` tuliom at ascii dot art.br
2020-12-11 16:31 ` fweimer at redhat dot com
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From: tuliom at ascii dot art.br @ 2020-11-03 15:16 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
Tulio Magno Quites Machado Filho <tuliom at ascii dot art.br> changed:
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2020-11-03 15:16 ` tuliom at ascii dot art.br
@ 2020-12-11 16:31 ` fweimer at redhat dot com
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From: fweimer at redhat dot com @ 2020-12-11 16:31 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-12-11
Status|UNCONFIRMED |ASSIGNED
Assignee|unassigned at sourceware dot org |fweimer at redhat dot com
Ever confirmed|0 |1
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2020-12-11 16:31 ` fweimer at redhat dot com
@ 2020-12-11 16:55 ` fweimer at redhat dot com
2020-12-11 17:31 ` cvs-commit at gcc dot gnu.org
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From: fweimer at redhat dot com @ 2020-12-11 16:55 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
--- Comment #7 from Florian Weimer <fweimer at redhat dot com> ---
Patches posted:
https://sourceware.org/pipermail/libc-alpha/2020-December/120635.html
https://sourceware.org/pipermail/libc-alpha/2020-December/120636.html
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From: cvs-commit at gcc dot gnu.org @ 2020-12-11 17:31 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #8 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=9ffa50b26b0cb5d3043adf6d3d0b1ea735acc147
commit 9ffa50b26b0cb5d3043adf6d3d0b1ea735acc147
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Dec 11 17:30:03 2020 +0100
elf: Include libc.so.6 as main program in dependency sort (bug 20972)
_dl_map_object_deps always sorts the initially loaded object first
during dependency sorting. This means it is relocated last in
dl_open_worker. This results in crashes in IFUNC resolvers without
lazy bindings if libraries are preloaded that refer to IFUNCs in
libc.so.6: the resolvers are called when libc.so.6 has not been
relocated yet, so references to _rtld_global_ro etc. crash.
The fix is to check against the libc.so.6 link map recorded by the
__libc_early_init framework, and let it participate in the dependency
sort.
This fixes bug 20972.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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2020-12-11 17:31 ` cvs-commit at gcc dot gnu.org
@ 2020-12-11 17:33 ` fweimer at redhat dot com
2020-12-14 6:47 ` krizan at eset dot sk
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From: fweimer at redhat dot com @ 2020-12-11 17:33 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Target Milestone|--- |2.33
Status|ASSIGNED |RESOLVED
--- Comment #9 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for glibc 2.33.
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2020-12-11 17:33 ` fweimer at redhat dot com
@ 2020-12-14 6:47 ` krizan at eset dot sk
2020-12-15 11:03 ` fweimer at redhat dot com
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From: krizan at eset dot sk @ 2020-12-14 6:47 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
--- Comment #10 from Matej Krizan <krizan at eset dot sk> ---
Thanks, Florian.
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[not found] <bug-20972-131@http.sourceware.org/bugzilla/>
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2020-12-14 6:47 ` krizan at eset dot sk
@ 2020-12-15 11:03 ` fweimer at redhat dot com
2021-03-04 14:40 ` shanzhikun at gmail dot com
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From: fweimer at redhat dot com @ 2020-12-15 11:03 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #11 from Florian Weimer <fweimer at redhat dot com> ---
A follow-up fix is needed:
https://sourceware.org/pipermail/libc-alpha/2020-December/120720.html
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2020-12-15 11:03 ` fweimer at redhat dot com
@ 2021-03-04 14:40 ` shanzhikun at gmail dot com
2021-03-05 18:31 ` fweimer at redhat dot com
2021-03-05 18:32 ` fweimer at redhat dot com
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From: shanzhikun at gmail dot com @ 2021-03-04 14:40 UTC (permalink / raw)
To: glibc-bugs
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Sdrkun <shanzhikun at gmail dot com> changed:
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CC| |shanzhikun at gmail dot com
--- Comment #12 from Sdrkun <shanzhikun at gmail dot com> ---
Hi, Florian, Will this fix be synchronized to glibc 2.28? I think version 2.28
also has this problem.
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2021-03-04 14:40 ` shanzhikun at gmail dot com
@ 2021-03-05 18:31 ` fweimer at redhat dot com
2021-03-05 18:32 ` fweimer at redhat dot com
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From: fweimer at redhat dot com @ 2021-03-05 18:31 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
--- Comment #13 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Sdrkun from comment #12)
> Hi, Florian, Will this fix be synchronized to glibc 2.28? I think version
> 2.28 also has this problem.
I have backported this into 2.28, but changes are rather invasive.
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2021-03-05 18:31 ` fweimer at redhat dot com
@ 2021-03-05 18:32 ` fweimer at redhat dot com
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From: fweimer at redhat dot com @ 2021-03-05 18:32 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=20972
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|REOPENED |RESOLVED
--- Comment #14 from Florian Weimer <fweimer at redhat dot com> ---
The second fix (also in 2.33):
commit 4d0985543f479a6f421d4d8a9e0d1dc71c9c2c53
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Dec 15 20:56:04 2020 +0100
elf: Record libc.so link map when it is the main program (bug 20972)
Otherwise, it will not participate in the dependency sorting.
Fixes commit 9ffa50b26b0cb5d3043adf6d3d0b1ea735acc147
("elf: Include libc.so.6 as main program in dependency sort
(bug 20972)").
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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