From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id B06A93858C2D; Fri, 25 Mar 2022 13:01:38 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B06A93858C2D
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: Fri, 25 Mar 2022 13:01:38 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: elfutils
X-Bugzilla-Component: libelf
X-Bugzilla-Version: unspecified
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: mark at klomp dot org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_status cc everconfirmed cf_reconfirmed_on
Message-ID: <bug-29000-10460-Ok518GtweT@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-29000-10460@http.sourceware.org/bugzilla/>
References: <bug-29000-10460@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: elfutils-devel@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Elfutils-devel mailing list <elfutils-devel.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/elfutils-devel>,
 <mailto:elfutils-devel-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/elfutils-devel/>
List-Help: <mailto:elfutils-devel-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/elfutils-devel>,
 <mailto:elfutils-devel-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Fri, 25 Mar 2022 13:01:38 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D29000

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
                 CC|                            |mark at klomp dot org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-03-25

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
That is interesting, it seems to occur because the section is decompressed
twice (and fails). Apparently elf_getdata leaves some uninitialized data ar=
ound
the first time, which gets picked up (and checked) the second time.

This can only happen when using elf_compress_gnu because we cannot tell whe=
ther
or not the data is already (de)compressed (it is a convention based on the
section name, instead of using a proper section flag).

It can also be triggered on the second example with valgrind eu-readelf -w

--=20
You are receiving this mail because:
You are on the CC list for the bug.=