linux-kernel - Re: [PATCH v3 linux-trace 1/8] tracing: attach eBPF programs to tracepoints and syscalls

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Message-ID: <CAMEtUuyLU5i4LW=ugTkOc4b2KLfo3cQhZe1pp+fLmq3qNfGQfg@mail.gmail.com>
Date:	Sat, 14 Feb 2015 17:48:58 -0500
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v3 linux-trace 1/8] tracing: attach eBPF programs to
 tracepoints and syscalls

On Wed, Feb 11, 2015 at 5:28 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> We're compiling the BPF stuff against the 'current' kernel headers
> right?

the tracex1 example is pulling kernel headers to demonstrate
how bpf_fetch*() helpers can be used to walk kernel structures
without debug info.
The other examples don't need any internal headers.

> So would enforcing module versioning not be sufficient?

I'm going to redo the ex1 to use kprobe and some form of
version check. Indeed module-like versioning should
be enough.
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