Your message dated Tue, 15 May 2012 22:00:29 +0200
with message-id <20120515200029.GA15175@PC-Ale>
and subject line Re: Bug#626389: libc6: uninitialised value via gconv_open.c:70
has caused the Debian Bug report #626389,
regarding libc6: uninitialised value via gconv_open.c:70
to be marked as done.
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--
626389: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=626389
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: libc6, valgrind
Version: libc6/2.13-2
Severity: normal
It seems that with the new libc6 package, we get some more uninitialized
values. There seems to be a value uninitialized somewhere (something
pointed to by _nl_C_locobj_ptr?), causing dgettext() to produce warnings
in valgrind, as seen in the example.
$ LC_ALL=de_DE.UTF-8 valgrind gettext -d "libapt-pkg4.10" "Recommends"
==21918== Memcheck, a memory error detector
==21918== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==21918== Using Valgrind-3.6.1 and LibVEX; rerun with -h for copyright info
==21918== Command: gettext -d libapt-pkg4.10 Recommends
==21918==
==21918== Conditional jump or move depends on uninitialised value(s)
==21918== at 0x4EAD23B: __GI___strcasecmp_l (strcmp.S:243)
==21918== by 0x4E4CE6C: __gconv_open (gconv_open.c:70)
==21918== by 0x4E59EC6: _nl_find_msg (dcigettext.c:990)
==21918== by 0x4E5A683: __dcigettext (dcigettext.c:654)
==21918== by 0x401D05: ??? (in /usr/bin/gettext)
==21918== by 0x4E4BEEC: (below main) (libc-start.c:228)
==21918==
==21918== Use of uninitialised value of size 8
==21918== at 0x4EAF374: __GI___strcasecmp_l (strcmp.S:2257)
==21918== by 0x4E4CE6C: __gconv_open (gconv_open.c:70)
==21918== by 0x4E59EC6: _nl_find_msg (dcigettext.c:990)
==21918== by 0x4E5A683: __dcigettext (dcigettext.c:654)
==21918== by 0x401D05: ??? (in /usr/bin/gettext)
==21918== by 0x4E4BEEC: (below main) (libc-start.c:228)
==21918==
==21918== Use of uninitialised value of size 8
==21918== at 0x4EAF378: __GI___strcasecmp_l (strcmp.S:2258)
==21918== by 0x4E4CE6C: __gconv_open (gconv_open.c:70)
==21918== by 0x4E59EC6: _nl_find_msg (dcigettext.c:990)
==21918== by 0x4E5A683: __dcigettext (dcigettext.c:654)
==21918== by 0x401D05: ??? (in /usr/bin/gettext)
==21918== by 0x4E4BEEC: (below main) (libc-start.c:228)
==21918==
Empfiehlt==21918==
==21918== HEAP SUMMARY:
==21918== in use at exit: 0 bytes in 0 blocks
==21918== total heap usage: 72 allocs, 72 frees, 11,090 bytes allocated
==21918==
==21918== All heap blocks were freed -- no leaks are possible
==21918==
==21918== For counts of detected and suppressed errors, rerun with: -v
==21918== Use --track-origins=yes to see where uninitialised values come from
==21918== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 4 from 4)
-- System Information:
Debian Release: wheezy/sid
APT prefers unstable
APT policy: (500, 'unstable'), (250, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.38-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libc6 depends on:
ii libc-bin 2.13-2 Embedded GNU C Library: Binaries
ii libgcc1 1:4.6.0-7 GCC support library
libc6 recommends no packages.
Versions of packages libc6 suggests:
ii debconf [debconf-2.0] 1.5.39 Debian configuration management sy
pn glibc-doc <none> (no description available)
ii locales 2.13-2 Embedded GNU C Library: National L
-- debconf information excluded
--
Julian Andres Klode - Debian Developer, Ubuntu Member
See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.
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--- End Message ---
--- Begin Message ---
Version: 1:3.7.0-1
On Wed, May 11, 2011 at 07:48:32PM +0200, Aurelien Jarno wrote:
> On Wed, May 11, 2011 at 03:51:10PM +0200, Julian Andres Klode wrote:
> > Package: libc6, valgrind
> > Version: libc6/2.13-2
> > Severity: normal
> >
> > It seems that with the new libc6 package, we get some more uninitialized
> > values. There seems to be a value uninitialized somewhere (something
> > pointed to by _nl_C_locobj_ptr?), causing dgettext() to produce warnings
> > in valgrind, as seen in the example.
>
> The problem is on the valgrind side. The new version of strcasecmp uses
> sse to compare strings, and compare them 16 bytes by 16 bytes:
>
> pxor %xmm0, %xmm0 /* clear %xmm0 for null char checks */
> pcmpeqb %xmm1, %xmm0 /* Any null chars? */
> pcmpeqb %xmm2, %xmm1 /* compare first 16 bytes for
> equality */
> psubb %xmm0, %xmm1 /* packed sub of comparison results*/
> pmovmskb %xmm1, %edx
> sub $0xffff, %edx /* if first 16 bytes are same, edx ==
> 0xffff */
> jnz LABEL(less16bytes) /* If not, find different value or
> null char */
This should have been fixed in the latest upstream release (3.7.0).
Cheers
--
perl -E '$_=q;$/= @{[@_]};and s;\S+;<inidehG ordnasselA>;eg;say~~reverse'
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