netdev - Re: [bug, netconsole, SLUB] BUG skbuff_head

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 18 Jul 2008 09:46:26 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten

Hi Ingo.

On Thu, Jul 17, 2008 at 11:42:22PM +0200, Ingo Molnar (mingo@...e.hu) wrote:
> Pid: 5098, comm: gdm-binary Not tainted 2.6.26-tip #3094
>  [<c0186f99>] print_trailer+0xa9/0xf0
>  [<c018707b>] check_bytes_and_report+0x9b/0xc0
>  [<c01874ae>] check_object+0x19e/0x1e0
>  [<c0187ef1>] __slab_alloc+0x371/0x4e0
>  [<c0188552>] kmem_cache_alloc+0xb2/0xc0
>  [<c06732dc>] ? __alloc_skb+0x2c/0x110

Out of curiosity, why does it scream at allocation time?
Does SLUB have a debug check at freeing time? If so, how does it work
and why didn't it caught use after free there?

-- 
	Evgeniy Polyakov
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html