netdev - Fwd: Simple kernel attack using socketpair. easy, 100% reproductiblle, works under guest. no way to protect :(

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Date:	Thu, 25 Nov 2010 12:52:13 +0500
From:	Марк Коренберг 
	<socketpair@...il.com>
To:	netdev@...r.kernel.org
Subject: Fwd: Simple kernel attack using socketpair. easy, 100%
 reproductiblle, works under guest. no way to protect :(

---------- Forwarded message ----------
From: Марк Коренберг <socketpair@...il.com>
Date: 2010/11/25
Subject: Re: Simple kernel attack using socketpair. easy, 100%
reproductiblle, works under guest. no way to protect :(
To: Eric Dumazet <eric.dumazet@...il.com>


2010/11/25 Eric Dumazet <eric.dumazet@...il.com>:
> Le jeudi 25 novembre 2010 à 11:52 +0500, Марк Коренберг a écrit :
>> Well, It seems, that patch likely will fix 100% CPU usage.
>>
>> But what about eating all available descriptors in kernel ? vulnerability ?
>>
>
> It doesnt fix cpu usage actually, your program eats 100% of one cpu,
> like the following one :
>
> for (;;) ;
>
> If you want not eat 100% cpu, I suggest you add some blocking calls,
> like usleep(10000)
>
> for (;;) usleep(10000);
>
> Patch only makes sure kernel wont eat too much memory to store inflight
> unix sockets.

I have attached source which proove, that loop not inside this
program, but inside kernel.

--
Segmentation fault



-- 
Segmentation fault

View attachment "sp.c" of type "text/x-csrc" (979 bytes)