linux-kernel - Re: [PATCH net-next] x86: bpf_jit_comp: secure bpf jit against spraying attacks

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Date:	Sun, 19 May 2013 23:56:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] x86: bpf_jit_comp: secure bpf jit against
 spraying attacks

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 17 May 2013 19:37:03 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> hpa bringed into my attention some security related issues
> with BPF JIT on x86.
> 
> This patch makes sure the bpf generated code is marked read only,
> as other kernel text sections.
> 
> It also splits the unused space (we vmalloc() and only use a fraction of
> the page) in two parts, so that the generated bpf code not starts at a
> known offset in the page, but a pseudo random one.
> 
> Refs:
> http://mainisusuallyafunction.blogspot.com/2012/11/attacking-hardened-linux-systems-with.html
> 
> Reported-by: H. Peter Anvin <hpa@...or.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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