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From: "mark at klomp dot org" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug libdw/28720] UBSan: member access within misaligned address
 0x7f6e8d80f142 for type 'struct Elf32_Phdr', which requires 4 byte alignment
Date: Fri, 24 Dec 2021 01:10:13 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28720

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at sourceware dot org   |mark at klomp dot o=
rg
   Last reconfirmed|                            |2021-12-24
                 CC|                            |mark at klomp dot org

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Evgeny Vereshchagin from comment #1)
> FWIW There are at least 4 uniq crashes honggfuzz has found related to eit=
her
> "member access within misaligned address" or "load of misaligned address":
>=20
> gelf_xlate.h:42:1: runtime error: member access within misaligned address
>=20
> link_map.c:292:15: runtime error: load of misaligned address 0x7fffe5c60b=
de
> for type 'Elf64_Addr'
>=20
> link_map.c:283:15: runtime error: load of misaligned address
>=20
> gelf_xlate.h:48:1: runtime error: member access within misaligned address

Interesting. I did run afl for some time (more than a day) and it found some
more issues, but none of these (yet?). I'll try honggfuzz in the future to =
see
if it can find some more.

Without reproducers for all of the above I don't know if I caught them all,=
 but
I think the following two proposed patches (also on my fuzz branch) should =
fix
them:

https://sourceware.org/pipermail/elfutils-devel/2021q4/004598.html
https://sourceware.org/pipermail/elfutils-devel/2021q4/004599.html

--=20
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