linux-kernel - Re: [RFC PATCH net-next 0/6] seccomp filter JIT

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Message-ID: <CAKU6vybdnpoM-szTrJRDVM2sqNPvAe3Tszg+tCuziKSOEXjJ1w@mail.gmail.com>
Date:	Fri, 26 Apr 2013 08:31:39 -0400
From:	Xi Wang <xi.wang@...il.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <linux@....linux.org.uk>,
	Eric Dumazet <edumazet@...gle.com>,
	Will Drewry <wad@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nicolas Schichan <nschichan@...ebox.fr>,
	Mircea Gherzan <mgherzan@...il.com>
Subject: Re: [RFC PATCH net-next 0/6] seccomp filter JIT

On Fri, Apr 26, 2013 at 7:46 AM, Daniel Borkmann <dborkman@...hat.com> wrote:
> I think BPF JIT for seccomp on ARM recently got applied to -mm tree
> if I'm not mistaken. It was from Nicolas Schichan (cc):
>
> http://thread.gmane.org/gmane.linux.ports.arm.kernel/233416/

Thanks for the pointer.

For the ARM part, looks like Nicolas's patch requires to implement two
wrappers for each arch:

  void seccomp_jit_compile(struct seccomp_filter *fp);
  void seccomp_jit_free(struct seccomp_filter *fp);

The implementation of these wrappers is almost identical to:

  void bpf_jit_compile(struct sk_filter *fp);
  void bpf_jit_free(struct sk_filter *fp);

While this patch uses a unified interface for both packet & seccomp filters.

  bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen);
  void bpf_jit_free(bpf_func_t bpf_func);

Shouldn't be hard to merge though.

- xi
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