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From: Namhyung Kim <namhyung@kernel.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: "Alexei Starovoitov" <ast@plumgrid.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"Ingo Molnar" <mingo@kernel.org>,
	"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Tom Zanussi" <tom.zanussi@linux.intel.com>,
	"Jovi Zhangwei" <jovi.zhangwei@gmail.com>,
	"Eric Dumazet" <edumazet@google.com>,
	linux-kernel@vger.kernel.org,
	"Linus Torvalds" <torvalds@linux-foundation.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Arnaldo Carvalho de Melo" <acme@infradead.org>,
	"Tom Zanussi" <tzanussi@gmail.com>,
	"Pekka Enberg" <penberg@iki.fi>,
	"David S. Miller" <davem@davemloft.net>,
	"Arjan van de Ven" <arjan@infradead.org>,
	"Christoph Hellwig" <hch@infradead.org>,
	"Oleg Nesterov" <oleg@redhat.com>
Subject: Re: [RFC PATCH tip 0/5] tracing filters with BPF
Date: Mon, 09 Dec 2013 16:29:48 +0900	[thread overview]
Message-ID: <877gbemqhf.fsf@sejong.aot.lge.com> (raw)
In-Reply-To: <529E81C1.2070208@hitachi.com> (Masami Hiramatsu's message of "Wed, 04 Dec 2013 10:13:37 +0900")

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

  reply	other threads:[~2013-12-09  7:29 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-12-03  4:28 Alexei Starovoitov
2013-12-03  4:28 ` [RFC PATCH tip 1/5] Extended BPF core framework Alexei Starovoitov
2013-12-03  4:28 ` [RFC PATCH tip 2/5] Extended BPF JIT for x86-64 Alexei Starovoitov
2013-12-03  4:28 ` [RFC PATCH tip 3/5] Extended BPF (64-bit BPF) design document Alexei Starovoitov
2013-12-03 17:01   ` H. Peter Anvin
2013-12-03 19:59     ` Alexei Starovoitov
2013-12-03 20:41       ` Frank Ch. Eigler
2013-12-03 21:31         ` Alexei Starovoitov
2013-12-04  9:24           ` Ingo Molnar
2013-12-03  4:28 ` [RFC PATCH tip 4/5] use BPF in tracing filters Alexei Starovoitov
2013-12-04  0:48   ` Masami Hiramatsu
2013-12-04  1:11     ` Steven Rostedt
2013-12-05  0:05       ` Masami Hiramatsu
2013-12-05  5:11         ` Alexei Starovoitov
2013-12-06  8:43           ` Masami Hiramatsu
2013-12-06 10:05             ` Jovi Zhangwei
2013-12-06 23:48               ` Masami Hiramatsu
2013-12-08 18:22                 ` Frank Ch. Eigler
2013-12-09 10:12                   ` Masami Hiramatsu
2013-12-03  4:28 ` [RFC PATCH tip 5/5] tracing filter examples in BPF Alexei Starovoitov
2013-12-04  0:35   ` Jonathan Corbet
2013-12-04  1:21     ` Alexei Starovoitov
2013-12-03  9:16 ` [RFC PATCH tip 0/5] tracing filters with BPF Ingo Molnar
2013-12-03 15:33   ` Steven Rostedt
2013-12-03 18:26     ` Alexei Starovoitov
2013-12-04  1:13       ` Masami Hiramatsu
2013-12-09  7:29         ` Namhyung Kim [this message]
2013-12-09  9:51           ` Masami Hiramatsu
2013-12-03 18:06   ` Alexei Starovoitov
2013-12-04  9:34     ` Ingo Molnar
2013-12-04 17:36       ` Alexei Starovoitov
2013-12-05 10:38         ` Ingo Molnar
2013-12-06  5:43           ` Alexei Starovoitov
2013-12-03 10:34 ` Masami Hiramatsu
2013-12-04  0:01 ` Andi Kleen
2013-12-04  3:09   ` Alexei Starovoitov
2013-12-05  4:40     ` Alexei Starovoitov
2013-12-05 10:41       ` Ingo Molnar
2013-12-05 13:46         ` Steven Rostedt
2013-12-05 22:36           ` Alexei Starovoitov
2013-12-05 23:37             ` Steven Rostedt
2013-12-06  4:49               ` Alexei Starovoitov
2013-12-10 15:47                 ` Ingo Molnar
2013-12-11  2:32                   ` Alexei Starovoitov
2013-12-11  3:35                     ` Masami Hiramatsu
2013-12-12  2:48                       ` Alexei Starovoitov
2013-12-05 16:11       ` Frank Ch. Eigler
2013-12-05 19:43         ` Alexei Starovoitov
2013-12-06  0:14       ` Andi Kleen
2013-12-06  1:10         ` H. Peter Anvin
2013-12-06  1:20           ` Andi Kleen
2013-12-06  1:28             ` H. Peter Anvin
2013-12-06 21:43               ` Frank Ch. Eigler
2013-12-06  5:16             ` Alexei Starovoitov
2013-12-06 23:54               ` Masami Hiramatsu
2013-12-07  1:01                 ` Alexei Starovoitov
2013-12-06  5:46             ` Jovi Zhangwei
2013-12-07  1:12             ` Alexei Starovoitov
2013-12-07 16:53               ` Jovi Zhangwei
2013-12-06  5:19       ` Jovi Zhangwei
2013-12-06 23:58         ` Masami Hiramatsu
2013-12-07 16:21           ` Jovi Zhangwei
2013-12-09  4:59             ` Masami Hiramatsu
2013-12-06  6:17       ` Jovi Zhangwei
2013-12-05 16:31   ` Frank Ch. Eigler

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