Your message dated Sun, 13 Jun 2010 04:48:39 -0500
with message-id <20100613094839.ga21...@burratino>
and subject line Re: Bug#583856: valgrind: suppressions need to be updated for
glibc 2.11
has caused the Debian Bug report #583856,
regarding valgrind: false positives in x86-32 strlen() from libc6/experimental
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
583856: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=583856
Debian Bug Tracking System
Contact ow...@bugs.debian.org with problems
--- Begin Message ---
Package: valgrind
Version: 1:3.5.0-3
A simple use of strlen() leaves valgrind unhappy:
$ cat valg-test.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
char* s = malloc(5);
memcpy(s, "aagh", 5);
printf("%d\n", (int) strlen(s));
return 0;
}
$ gcc -Wall -W -o valg-test valg-test.c
$ valgrind ./valg-test
==22406== Memcheck, a memory error detector
==22406== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==22406== Using Valgrind-3.5.0-Debian and LibVEX; rerun with -h for copyright
info
==22406== Command: ./valg-test
==22406==
==22406== Conditional jump or move depends on uninitialised value(s)
==22406== at 0x400C561: _dl_relocate_object (do-rel.h:104)
[... a few Memcheck:Cond from dl.so ...]
==22406==
==22406== Invalid read of size 4
==22406== at 0x40A938B: __GI_strlen (strlen.S:115)
==22406== by 0x404BC84: (below main) (libc-start.c:228)
==22406== Address 0x418002c is 4 bytes inside a block of size 5 alloc'd
==22406== at 0x4024C4C: malloc (vg_replace_malloc.c:195)
==22406== by 0x8048478: main (in /home/jrn/valg-test)
==22406==
4
==22406==
[... summary correctly noting the 5 bytes leaked ...]
$
IIRC valgrind should be redirecting strlen() calls to its own, simpler
implementation. Maybe that is failing for some reason...
$ COLUMNS=72 dpkg -l libc6 libc6-dbg | tail -2
ii libc6 2.11-0exp4 Embedded GNU C Library: Shared libraries
ii libc6-dbg 2.11-0exp4 Embedded GNU C Library: detached debugging s
$ uname -r
2.6.33-2-686
--- End Message ---
--- Begin Message ---
Version: 1:3.5.0+3.6.0svn20100609-1
Török Edwin wrote:
> Upgrading to the valgrind version in experimental
> (1:3.5.0+3.6.0svn20100609-1) makes all these warnings go away, if used
> with eglibc 2.11.
*checks*
Thanks!
--- End Message ---
