linux-kernel - Re: [RFC PATCH v2 tip 0/7] 64-bit BPF insn set and tracing filters

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Message-ID: <52FD4D78.4050709@redhat.com>
Date:	Thu, 13 Feb 2014 23:55:52 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Alexei Starovoitov <ast@...mgrid.com>,
	Ingo Molnar <mingo@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Jovi Zhangwei <jovi.zhangwei@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Pekka Enberg <penberg@....fi>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH v2 tip 0/7] 64-bit BPF insn set and tracing filters

On 02/13/2014 11:47 PM, H. Peter Anvin wrote:
> On 02/13/2014 02:44 PM, Daniel Borkmann wrote:
>>
>> Well, if that would be the case, then seccomp would have had JIT support
>> long ago. ;-) Right now BPF filters with seccomp are not JIT compiled
>> for _any_ architecture.
>
> Really, I was under the impression there were.  They *should be*, that
> was an important concept in the development of the seccomp filters.

$ git grep -n BPF_S_ANC_SECCOMP_LD_W
include/linux/filter.h:153:     BPF_S_ANC_SECCOMP_LD_W,
kernel/seccomp.c:136:                   ftest->code = BPF_S_ANC_SECCOMP_LD_W;
net/core/filter.c:389:          case BPF_S_ANC_SECCOMP_LD_W:
net/core/filter.c:812:          [BPF_S_ANC_SECCOMP_LD_W] = BPF_LD|BPF_B|BPF_ABS,

Afaik, there had been attempts to support it, but had flaws in it.

> 	-hpa
>
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