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Re: [PATCH 3.12 32/64] unix: properly account for FDs passed over unix sockets

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On 02/11/2016, 06:32 PM, Willy Tarreau wrote:
> Hi Jiri,
> 
> On Thu, Feb 11, 2016 at 02:59:08PM +0100, Jiri Slaby wrote:
>> From: willy tarreau <w@1wt.eu>
>>
>> 3.12-stable review patch.  If anyone has any objections, please let me know.
>>
>> ===============
>>
>> [ Upstream commit 712f4aad406bb1ed67f3f98d04c044191f0ff593 ]
>>
>> It is possible for a process to allocate and accumulate far more FDs than
>> the process' limit by sending them over a unix socket then closing them
>> to keep the process' fd count low.
>>
>> This change addresses this problem by keeping track of the number of FDs
>> in flight per user and preventing non-privileged processes from having
>> more FDs in flight than their configured FD limit.
>>
>> Reported-by: socketpair@gmail.com
>> Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
>> Mitigates: CVE-2013-4312 (Linux 2.0+)
>> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
>> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
>> Signed-off-by: Willy Tarreau <w@1wt.eu>
>> Signed-off-by: David S. Miller <davem@davemloft.net>
>> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
> 
> A possible issue was reported regarding this patch, and Hannes
> implemented a fix that's not yet in mainline. I guess it's
> preferable to postpone this patch for now.

Hi,

yes definitely. Thanks for noting.

For reference:
http://article.gmane.org/gmane.linux.kernel/2142236

thanks,
-- 
js
suse labs

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[PATCH 3.12 32/64] unix: properly account for FDs passed over unix sockets Jiri Slaby <jslaby@suse.cz> - 2016-02-11 15:20 +0100
  Re: [PATCH 3.12 32/64] unix: properly account for FDs passed over unix sockets Willy Tarreau <w@1wt.eu> - 2016-02-11 18:40 +0100
    Re: [PATCH 3.12 32/64] unix: properly account for FDs passed over  unix sockets Jiri Slaby <jslaby@suse.cz> - 2016-02-12 09:00 +0100
      Re: [PATCH 3.12 32/64] unix: properly account for FDs passed over  unix sockets Philipp Hahn <pmhahn@pmhahn.de> - 2016-02-12 09:50 +0100
        Re: [PATCH 3.12 32/64] unix: properly account for FDs passed over unix sockets Willy Tarreau <w@1wt.eu> - 2016-02-12 10:10 +0100

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