linux-kernel - Re: [PATCH] net: bpf_jit: fix BPF_S_LDX_B

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Date:	Mon, 19 Mar 2012 17:42:41 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	indan@....nu, wad@...omium.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
	kernel-hardening@...ts.openwall.com, netdev@...r.kernel.org,
	x86@...nel.org, arnd@...db.de, hpa@...or.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, luto@....edu,
	eparis@...hat.com, serge.hallyn@...onical.com, djm@...drot.org,
	scarybeasts@...il.com, pmoore@...hat.com,
	akpm@...ux-foundation.org, corbet@....net, markus@...omium.org,
	coreyb@...ux.vnet.ibm.com, keescook@...omium.org, matt@...abs.org
Subject: Re: [PATCH] net: bpf_jit: fix BPF_S_LDX_B_MSH compilation

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sun, 18 Mar 2012 05:40:48 -0700

> [PATCH] net: bpf_jit: fix BPF_S_LDX_B_MSH compilation
> 
> Matt Evans spotted that x86 bpf_jit was incorrectly handling negative
> constant offsets in BPF_S_LDX_B_MSH instruction.
> 
> We need to abort JIT compilation like we do in common_load so that
> filter uses the interpreter code and can call __load_pointer()
> 
> Reference: http://lists.openwall.net/netdev/2011/07/19/11
> 
> Thanks to Indan Zupancic to bring back this issue.
> 
> Reported-by: Matt Evans <matt@...abs.org>
> Reported-by: Indan Zupancic <indan@....nu>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied and even though libpcap won't generate this I'll queue it up
to -stable anyways.
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