Re: clamd memory corruption (may be jemalloc related)

From: Kris Kennaway <kris_at_obsecurity.org>
Date: Thu, 19 Apr 2007 16:22:52 -0400
On Thu, Apr 19, 2007 at 11:22:38PM +0400, Anton Yuzhaninov wrote:
> Hello.
> 
> I try to test clamav 0.90.2 on current and got strange errors:
> 
> LibClamAV Warning: Multipart/alternative MIME message contains no boundary header
> LibClamAV Warning: Multipart/ZZZZZZZZZZZZ?????? MIME message contains no boundary header
> LibClamAV Warning: Multipart/related MIME message contains no boundary header
> 
> And sometimes clamd segfaults.
> 
> $ uname -a
> FreeBSD clam-test2 7.0-CURRENT FreeBSD 7.0-CURRENT #1: Thu Apr 19 13:37:17 MSD 2007     citrin_at_clam-test2:/usr/obj/usr/src/sys/TEST  amd64
> $ fgrep Multiprocessor /var/run/dmesg.boot
> FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
> $ ls -l /etc/malloc.conf
> lrwxr-xr-x  1 root  wheel  2 19 ??? 15:12 /etc/malloc.conf -> AJ
> 
> This Warnings issued randomly and it looks like race condition.
> 
> This problem occurred only when running two or more clamdscan
> processes in parallel. With one process no warnings on same test
> messages.
> 
> Also on same hardware, same test messages, same clamav version, but on
> 6.2-STABLE (where old malloc) no errors even when running 30 clamdscan
> processes in parallel.
> 
> Any suggestions to debug this problem?

You'll have to look at the source and figure out where it's using
uninitialized or freed memory.

Kris

Received on Thu Apr 19 2007 - 18:22:55 UTC

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