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 61B973858C52; Wed, 15 Nov 2023 09:32:24 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 61B973858C52
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org;
	s=default; t=1700040744;
	bh=PBALNEyYhzpVA4C5cHwwxo6em37ac6ezNoeQKNB6YG4=;
	h=From:To:Subject:Date:From;
	b=RiLtxdvtZayrYMpp87viyFT/P0DZJJ31B2Oi+R49wFOYrGbpOCFYfbjP9FNpaH6qo
	 7MTFOAh7dukd/QkEmNUqwqRwH11gqqXhQoF28yg3lRlCBLPj8rXkdUrQB/8w3JcjWF
	 K0jaCD6QZOE/VHH2TdAFX+E8VY62IEkOp9zJPaT8=
From: "ludwig.rydberg at gaisler dot com"
 <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/31068] New: sysdeps: sparc: invalid data access in memset
 due to regression
Date: Wed, 15 Nov 2023 09:32:23 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.36
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ludwig.rydberg at gaisler dot com
X-Bugzilla-Status: UNCONFIRMED
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_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter cc target_milestone
Message-ID: <bug-31068-131@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
List-Id: <glibc-bugs.sourceware.org>

https://sourceware.org/bugzilla/show_bug.cgi?id=3D31068

            Bug ID: 31068
           Summary: sysdeps: sparc: invalid data access in memset due to
                    regression
           Product: glibc
           Version: 2.36
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: ludwig.rydberg at gaisler dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Description:
When testing the glibc-master (2023-11-13) on sparc32 (leon) a memset
regression was observed.

The issue was introduced by commit a61933fe27df ("sparc: Remove bzero
optimization").=20

How to reproduce:
It can be reproduced running the "string/test-memset" test on sparc32.
Fail rate: 100%

Test output:
string/test-memset.test-result:
FAIL: string/test-memset
original exit status 1

string/test-memset.out:
Didn't expect signal from child: got `Segmentation fault'

Root cause:
The reason for the issue was that when moving the bzero routine to the end =
of
the memset, the branch jump in the end made a jump back to wrong label caus=
ing
the invalid data access.

A fix has been implemented and will be submitted.

--
glibc version: master d1dcb565a1fb (2023-11-13)
  - The issue was first observed in glibc-2.36.
gcc version 10.2.0 (LEON Linux 5.10 Toolchain 1.4-87-gcd8128e)
  - sparc-gaisler-linux5.10
GNU ld (GNU Binutils) 2.34

glibc configure options:
--prefix=3D/usr --enable-bind-now --host=3Dsparc-gaisler-linux5.10
--with-headers=3D$USER/git/linux-toolchain/build-gcc-linux64//opt/sparc-gai=
sler-linux5.10/sysroot/usr/include
--with-binutils=3D$USER/git/linux-toolchain/build-gcc-linux64/binutils/binu=
tils
--disable-default-pie libc_cv_forced_unwind=3Dyes libc_cv_ssp=3Dno

Target: Linux buildroot 5.10.175-leon1.4
Host: Ubuntu 22.04 6.2.0-36-generic

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