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Bug#550625: [Stable] Bug#550625: libc6: Realloc sometimes fails to copy all memory correctly

Hi stable release managers,

Would it be possible to do a stable upload to fix this problem (see


On Sun, Oct 11, 2009 at 04:42:35PM +0200, Sebastian Hahn wrote:
> Package: libc6
> Version: 2.7-18
> Severity: normal
> I've been trying to track down a bug that became apparent when using Tor. Sometimes,
> realloc apparently failed to copy the last few bytes of a buffer over when it enlarged
> said buffer.
> I've done some digging, and came across a bugreport about the issue:
> http://sources.redhat.com/bugzilla/show_bug.cgi?id=10018 
> Also, I found a glibc bugreport with an attached patch to
> fix the problem, but the patch was rejected by the glibc maintainer:
> http://sources.redhat.com/bugzilla/show_bug.cgi?id=5743
> a few months later though, the fix was applied:
> http://repo.or.cz/w/glibc.git?a=commitdiff;h=486bdb886330a250af76cbb12af55d2c67ec0981
> I checked Lenny's sources, and the offending line in malloc.c is the same as in
> the bugreports above, Squeeze, due to updating to a newer version of libc,
> doesn't have it.
> I'm not sure why the test programs referenced don't trigger the bug on Lenny
> for me, but when patching the Tor source to manually compare the last few bytes
> of a buffer before it is realloc'ed to afterwards exhibits the issue.
> -- System Information:
> Debian Release: 5.0.3
>   APT prefers stable
>   APT policy: (500, 'stable')
> Architecture: i386 (i686)
> Kernel: Linux 2.6.26-1-686-bigmem (SMP w/2 CPU cores)
> Locale: LANG=en_US.ISO-8859-15, LC_CTYPE=en_US.ISO-8859-15 (charmap=ISO-8859-15)
> Shell: /bin/sh linked to /bin/bash
> Versions of packages libc6 depends on:
> ii  libgcc1                      1:4.3.2-1.1 GCC support library
> libc6 recommends no packages.
> Versions of packages libc6 suggests:
> pn  glibc-doc                     <none>     (no description available)
> ii  libc6-i686                    2.7-18     GNU C Library: Shared libraries [i
> ii  locales                       2.7-18     GNU C Library: National Language (
> -- debconf information excluded
> -- 
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Aurelien Jarno	                        GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net

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