Bug#1028504: libc6: valgrind reports "Invalid read of size 8" deep in decompose_rpath in dl-load.c

[Aurelien Jarno <aurelien@aurel32.net>]

control: reassign -1 valgrind
control: affects -1 libc6

Hi,

On 2023-01-12 10:15, Mike Hommey wrote:
> Package: libc6
> Version: 2.36-8
> Severity: important
> 
> STR:
> - apt install firefox valgrind
> - valgrind --show-mismatched-frees=no firefox
> 
> valgrind will quickly show errors like:
> ==6383== Invalid read of size 8
> ==6383==    at 0x4023A34: strncmp (strcmp-sse2.S:162)

Looking at the source code the code in the glibc is correct. It reads
the data in chunk of 16-bytes, which indeed can go slightly over the
allocated memory, but extra care is taken to not cross a cache line.

The solution there is to add a suppression file to valgrind to ignore
that. I am therefore reassigning the bug to the valgrind package.

Regards
Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net