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
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