linux-kernel - Re: [PATCH -tip v8 06/26] [BUGFIX] x86: Prohibit probing on native_set_debugreg/load

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Message-ID: <20140321205319.02dc33f4@gandalf.local.home>
Date:	Fri, 21 Mar 2014 20:53:19 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>, x86@...nel.org,
	Andi Kleen <andi@...stfloor.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Chris Wright <chrisw@...s-sol.org>, fche@...hat.com,
	mingo@...hat.com, systemtap@...rceware.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alok Kataria <akataria@...are.com>
Subject: Re: [PATCH -tip v8 06/26] [BUGFIX] x86: Prohibit probing on
 native_set_debugreg/load_idt

On Wed, 05 Mar 2014 20:59:25 +0900
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> Prohibit probing on native_set_debugreg and native_load_idt.
> Since the kprobes uses do_debug for single stepping,
> functions called from do_debug before notify_die must not
> be probed.
> And also native_load_idt is called from paranoid_exit when
> returning int3, this also must not be probed.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Jeremy Fitzhardinge <jeremy@...p.org>

Reviewed-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve
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