linux-kernel - Re: [PATCH] Freeing dst when the reference count <0 causes general protection fault, it could be a major security flaw as rogue app can modify dst to crash kernel.

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Message-Id: <20140913.153214.322363335285385219.davem@davemloft.net>
Date:	Sat, 13 Sep 2014 15:32:14 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	shakilk1729@...il.com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, edumazet@...gle.com
Subject: Re: [PATCH] Freeing dst when the reference count <0 causes general
 protection fault, it could be a major security flaw as rogue app can
 modify dst to crash kernel.

From: Shakil k <shakilk1729@...il.com>
Date: Sat, 13 Sep 2014 10:46:39 -0700

> On Sat, Sep 13, 2014 at 4:50 AM, Eric Dumazet <eric.dumazet@...il.com>
> wrote:
> 
>> Can you describe how this could trigger with a pristine kernel ?
>> This can be reproduced with our custom network traffic to simulate malware.
>>
> Point is the user can modify certain packets and can cause a kernel crash
> causing blackout to all the linux boxes hosting services :(

Eric is kindly asking you exactly how to reproduce the crash, so he
can 1) fix it and 2) generate a test case that gets run all the time
in the future.

Please answer his question directly instead of steering the conversation
endless towards other aspects.
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