linux-kernel - Re: [PATCH] net/packet: check length in getsockopt() called with PACKET

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Date:   Tue, 25 Apr 2017 14:06:04 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     glider@...gle.com
Cc:     dvyukov@...gle.com, kcc@...gle.com, edumazet@...gle.com,
        kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] net/packet: check length in getsockopt() called with
 PACKET_HDRLEN

From: Alexander Potapenko <glider@...gle.com>
Date: Tue, 25 Apr 2017 18:51:46 +0200

> In the case getsockopt() is called with PACKET_HDRLEN and optlen < 4
> |val| remains uninitialized and the syscall may behave differently
> depending on its value, and even copy garbage to userspace on certain
> architectures. To fix this we now return -EINVAL if optlen is too small.
> 
> This bug has been detected with KMSAN.
> 
> Signed-off-by: Alexander Potapenko <glider@...gle.com>

Applied, thanks.