netdev - Re: [PATCH -next v2] unix stream: Fix use-after-free crashes

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Message-ID: <CA+icZUVKr7YaqPhoHeaDJwfqJEE_bhwum7vti2Qk3wxtQ1JXUQ@mail.gmail.com>
Date:	Thu, 8 Sep 2011 10:43:53 +0200
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	Tim Chen <tim.c.chen@...ux.intel.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 Thu, Sep 8, 2011 at 9:56 AM, Jiri Slaby <jirislaby@...il.com> wrote:
> 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
>

I have tested the same patch here (before shopping, but can test the
"final" patch, too.).

- Sedat -
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