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]
Message-ID: <4E687511.3040107@gmail.com>
Date:	Thu, 08 Sep 2011 09:56:01 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"Yan, Zheng" <zheng.z.yan@...el.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	"sedat.dilek@...il.com" <sedat.dilek@...il.com>,
	"Yan, Zheng" <yanzheng@...n.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
	"Shi, Alex" <alex.shi@...el.com>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Subject: Re: [PATCH -next v2] unix stream: Fix use-after-free crashes

On 09/08/2011 09:11 AM, Eric Dumazet wrote:
> Le jeudi 08 septembre 2011 à 14:22 +0800, Yan, Zheng a écrit :
> 
>> I don't think so. unix_scm_to_skb() calls unix_attach_fds(), it
>> always duplicates scm->fp. 
> 
> What a mess. This code is a nightmare.
> 
> Part of the mess comes from scm_destroy() and scm_release() duplication.
> 
> We should have scm_destroy() only, as before, and NULLify scm->pid/cred
> in unix_scm_to_skb() when we steal references.

This patch works for me. I haven't tried the out_err fixup from the
followup, but I assume I won't spot a difference as those are fail paths
anyway...

thanks,
-- 
js
--
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

Powered by Openwall GNU/*/Linux Powered by OpenVZ