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From: "mark at klomp dot org" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug libelf/29000] Conditional jump or move depends on uninitialised
 value in elf_compress_gnu
Date: Tue, 29 Mar 2022 22:35:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29000

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at sourceware dot org   |mark at klomp dot o=
rg

--- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
> It can also be triggered on the second example with valgrind eu-readelf -w

Thanks, that was very useful. I don't think it really is a bug. But it is u=
se
of undefined data. The issue is that if the ELF data structures need to be
converted then it only makes sense to convert full datastructures. But just
dropping the bad/partial data is not a great idea either. So this proposed
patch just copies over the bad/partial data that couldn't be converted. That
way it is at least deterministically defined.

https://code.wildebeest.org/git/user/mjw/elfutils/commit/?h=3Dfuzz
https://sourceware.org/pipermail/elfutils-devel/2022q1/004825.html

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