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Date:	Mon, 20 May 2013 16:19:41 +0200
From:	Florian Westphal <>
To:	Eric Dumazet <>
Cc:	David Miller <>,
	netdev <>,
	"H. Peter Anvin" <>,
	"" <>
Subject: Re: [PATCH net-next] x86: bpf_jit_comp: secure bpf jit against
 spraying attacks

Eric Dumazet <> wrote:
> From: Eric Dumazet <>
> 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:

What about emitting additional instructions at random locations in the
generated code itself?

Eg., after every instruction, have random chance to insert
'xor $0xcc,%al; xor $0xcc,%al', etc?
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