netdev - Re: [PATCH net-next v3] af_unix: Fix use-after-free crashes

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Date:	Thu, 08 Sep 2011 01:37:45 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	sedat.dilek@...il.com, "Yan, Zheng" <zheng.z.yan@...el.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>,
	"jirislaby@...il.com" <jirislaby@...il.com>,
	"Shi, Alex" <alex.shi@...el.com>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Subject: Re: [PATCH net-next v3] af_unix: Fix use-after-free crashes

On Thu, 2011-09-08 at 15:21 +0200, Eric Dumazet wrote:
> Le jeudi 08 septembre 2011 à 11:59 +0200, Sedat Dilek a écrit :
> 
> > I have tested this fixup patch on i386.
> > Can we have a separate patch with corrected descriptive text?
> > 
> > Thanks to all involved people.
> 
> Here it is :
> 
> [PATCH net-next v3] af_unix: Fix use-after-free crashes
> 
> Commit 0856a30409 (Scm: Remove unnecessary pid & credential references
> in Unix socket's send and receive path) introduced an use-after-free
> bug.
> 
> We are allowed to steal the references to pid/cred only in the last skb
> sent from unix_stream_sendmsg(), because first skbs might be consumed by
> the receiver before we finish our sendmsg() call.
> 
> Remove scm_release() helper, since its cleaner to clear pid/cred fields
> in unix_scm_to_skb() when we steal them.
> 
> Based on prior patches from Yan Zheng and Tim Chen
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Reported-by: Jiri Slaby <jirislaby@...il.com>
> Tested-by: Sedat Dilek <sedat.dilek@...glemail.com>
> Tested-by: Valdis Kletnieks <Valdis.Kletnieks@...edu>
> ---

Thanks.

Acked-by: Tim Chen <tim.c.chen@...ux.intel.com>

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