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 81F6E3853C08; Sun, 22 Aug 2021 13:08:30 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 81F6E3853C08
From: "rjones at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug malloc/28256] Conditional jump or move depends on uninitialised
 value(s) in __GI___tunables_init
Date: Sun, 22 Aug 2021 13:08:30 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: malloc
X-Bugzilla-Version: 2.34
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rjones at redhat dot com
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: 
Message-ID: <bug-28256-131-8U4qrAomuO@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-28256-131@http.sourceware.org/bugzilla/>
References: <bug-28256-131@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: glibc-bugs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-bugs mailing list <glibc-bugs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-bugs/>
List-Help: <mailto:glibc-bugs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Sun, 22 Aug 2021 13:08:30 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D28256

--- Comment #1 from Richard Jones <rjones at redhat dot com> ---
https://sourceware.org/git/?p=3Dglibc.git;a=3Dblob;f=3Delf/dl-tunables.c;h=
=3D8009e54ee5db32beb228e69b05352e80c809c42c;hb=3DHEAD#l205

Looking at the code it seems like you're adding the length
to the p pointer (line 205) and then referencing p[len] (line 211)
which is obviously going to reference far beyond the end
of the string in memory.

I don't think this is exploitable though - GLIBC_TUNABLES
is removed in setuid processes.

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