linux-kernel - Re: [PATCH -tip ] [Bugfix] x86/kprobes: Fix build errors and blacklist context_track

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Message-ID: <20140616155213.GG32264@localhost.localdomain>
Date:	Mon, 16 Jun 2014 17:52:15 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
	Kees Cook <keescook@...omium.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Rusty Russell <rusty@...tcorp.com.au>, x86@...nel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH -tip ] [Bugfix] x86/kprobes: Fix build errors and
 blacklist context_track_user

On Sat, Jun 14, 2014 at 06:47:12AM +0000, Masami Hiramatsu wrote:
> This reverts commit ecd50f714c421c759354632dd00f70c718c95b10
> since it causes build errors with CONFIG_CONTEXT_TRACKING and
> that has been made from misunderstandings; context_track_user_*()
> don't involve much in interrupt context, it just returns
> if in_interrupt() is true.
> 
> Instead of changing the do_debug/int3(), this just adds
> context_track_user_*() to kprobes blacklist, since those are
> still can be called right before kprobes handles int3 and debug
> exceptions, and probing those will cause infinit loop.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Reported-by: Frederic Weisbecker <fweisbec@...il.com>

Thanks a lot!

Acked-by: Frederic Weisbecker <fweisbec@...il.com>
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