linux-kernel - Re: [RFC PATCH tip 0/5] tracing filters with BPF

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Message-ID: <877gbemqhf.fsf@sejong.aot.lge.com>
Date:	Mon, 09 Dec 2013 16:29:48 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Alexei Starovoitov <ast@...mgrid.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Jovi Zhangwei <jovi.zhangwei@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Pekka Enberg <penberg@....fi>,
	"David S. Miller" <davem@...emloft.net>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [RFC PATCH tip 0/5] tracing filters with BPF

Hi Masami,

On Wed, 04 Dec 2013 10:13:37 +0900, Masami Hiramatsu wrote:
> (2013/12/04 3:26), Alexei Starovoitov wrote:
>> the only inconvenience so far is to know how parameters are getting
>> into registers.
>> on x86-64, arg1 is in rdi, arg2 is in rsi,... I want to improve that
>> after first step is done.
>
> Actually, that part is done by the perf-probe and ftrace dynamic events
> (kernel/trace/trace_probe.c). I think this generic BPF is good for
> re-implementing fetch methods. :)

For implementing patch method, it seems that it needs to access to user
memory, stack and/or current (task_struct - for utask or vma later) from
the BPF VM as well.  Isn't it OK from the security perspective?

Anyway, I'll take a look at it later if I have time, but I want to get
the existing/pending implementation merged first. :)

Thanks,
Namhyung
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