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

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Message-ID: <1369059993.3301.174.camel@edumazet-glaptop>
Date:	Mon, 20 May 2013 07:26:33 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Florian Westphal <fw@...len.de>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] x86: bpf_jit_comp: secure bpf jit against
 spraying attacks

On Mon, 2013-05-20 at 16:19 +0200, Florian Westphal wrote:

> 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?

This will be the latest thing I'll do.

Frankly, whole point of BPF JIT is speed.

If we have slow code, just use the interpretor instead.



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