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, 21 Nov 2014 11:47:06 -0500
From:	Chris Mason <clm@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<netdev@...r.kernel.org>
Subject: Re: crash in __kfree_skb on v3.18-rc5 with CONFIG_DEBUG_PAGEALLOC



On Fri, Nov 21, 2014 at 11:37 AM, Eric Dumazet <eric.dumazet@...il.com> 
wrote:
> On Fri, 2014-11-21 at 08:31 -0800, Eric Dumazet wrote:
> 
>>  Can you double check, or send whole __kfree_skb() disassembly ?
>> 
>>  I do not understand how skb->fclone could possibly trap _at_ this 
>> point.
> 
> Oh well, I think commit ce1a4ea3f1258 ("net: avoid one atomic 
> operation
> in skb_clone()") is the problem, I'll send a revert.

Once my current run is done, I can revert this and try a loop.  But I 
don't see how this commit causes a use-after-free on the skb itself?

-chris



--
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

Powered by blists - more mailing lists