GNU bug report logs - #7213
[PATCH] sort: fix buffer overrun on 32-bit hosts when warning re obsolete keys

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From: Pádraig Brady <P <at> draigBrady.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 7213 <at> debbugs.gnu.org
Subject: bug#7213: [PATCH] sort: fix buffer overrun on 32-bit hosts when warning re obsolete keys
Date: Thu, 14 Oct 2010 11:27:24 +0100

Ah I wasn't aware anytostr put the numbers at the end of the buffer.
That's confirmed by replacing the tmp buffer with one on the heap
and running:

$ valgrind ./src/sort --debug  +0 -1 /dev/null
==25943== Memcheck, a memory error detector.
==25943== Invalid write of size 1
==25943==    at 0x8051F25: umaxtostr (anytostr.c:34)
==25943==    by 0x8050D95: main (sort.c:2336)
==25943==  Address 0x4026f64 is 9 bytes after a block of size 11 alloc'd

On 14/10/10 08:12, Paul Eggert wrote:
> * src/sort.c (key_warnings): Local buffer should be of size
> INT_BUFSIZE_BOUND (uintmax_t), not INT_BUFSIZE_BOUND (sword).
> This bug was discovered by running 'make check' on a 32-bit
> Solaris 8 sparc host, using Sun cc.

So the test failed due to buffer overrun side effects?

thanks!
Pádraig.

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