linux-kernel - Re: [PATCH v8 1/8] sk_run_filter: add support for custom load

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Message-ID: <CABqD9harZap1LUmcYH8w5gpFktVunYjV9UbKNTbBjqsUf+ThgQ@mail.gmail.com>
Date:	Thu, 16 Feb 2012 20:22:28 -0600
From:	Will Drewry <wad@...omium.org>
To:	Joe Perches <joe@...ches.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.org,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, 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, indan@....nu, pmoore@...hat.com,
	akpm@...ux-foundation.org, corbet@....net, eric.dumazet@...il.com,
	markus@...omium.org, keescook@...omium.org
Subject: Re: [PATCH v8 1/8] sk_run_filter: add support for custom load_pointer

On Thu, Feb 16, 2012 at 7:54 PM, Joe Perches <joe@...ches.com> wrote:
> On Thu, 2012-02-16 at 14:02 -0600, Will Drewry wrote:
>> This change allows CONFIG_SECCOMP to make use of BPF programs for
>> user-controlled system call filtering (as shown in this patch series).
> []
>> diff --git a/net/core/filter.c b/net/core/filter.c
> []
>> @@ -542,9 +602,35 @@ int sk_chk_filter(struct sock_filter *filter, unsigned int flen)
> []
>>               case BPF_S_LD_W_ABS:
>> +                     MAYBE_USE_LOAD_FN(LD_W_ABS);
>>               case BPF_S_LD_H_ABS:
>> +                     MAYBE_USE_LOAD_FN(LD_H_ABS);
>>               case BPF_S_LD_B_ABS:
>> +                     MAYBE_USE_LOAD_FN(LD_B_ABS);
>
> Would be nice to note fallthrough or add break if necessary.

Cool - I'll note it.  They are meant to fall through, but I can just
go back to using goto handle_skb_load or some such so it is more
readable.

Thanks!
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