linux-kernel - Re: [PATCH] net: filter: fix upper BPF instruction limit

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Message-ID: <53A21610.1040104@redhat.com>
Date:	Thu, 19 Jun 2014 00:43:28 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Kees Cook <keescook@...omium.org>
CC:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Chema Gonzalez <chema@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: filter: fix upper BPF instruction limit

On 06/19/2014 12:34 AM, Kees Cook wrote:
> The original checks (via sk_chk_filter) for instruction count uses ">",
> not ">=", so changing this in sk_convert_filter has the potential to break
> existing seccomp filters that used exactly BPF_MAXINSNS many instructions.
>
> Fixes: bd4cf0ed331a ("net: filter: rework/optimize internal BPF interpreter's instruction set")
> Signed-off-by: Kees Cook <keescook@...omium.org>

Acked-by: Daniel Borkmann <dborkman@...hat.com>
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