linux-kernel - Re: [PATCH -tip v8 03/26] kprobes: Prohibit probing on .entry.text code

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Message-ID: <20140324145351.2c65e41f@gandalf.local.home>
Date:	Mon, 24 Mar 2014 14:53:51 -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>,
	Andi Kleen <andi@...stfloor.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>, fche@...hat.com,
	mingo@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
	systemtap@...rceware.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Seiji Aguchi <seiji.aguchi@....com>
Subject: Re: [PATCH -tip v8 03/26] kprobes: Prohibit probing on .entry.text
 code

On Mon, 24 Mar 2014 10:48:02 +0900
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> (2014/03/22 7:04), Steven Rostedt wrote:
> > On Wed, 05 Mar 2014 20:59:04 +0900
> > Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
> > 
> > 
> >>  struct kprobe_insn_cache {
> >>  	struct mutex mutex;
> >> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> >> index ceeadfc..5b5ac76 100644
> >> --- a/kernel/kprobes.c
> >> +++ b/kernel/kprobes.c
> >> @@ -96,9 +96,6 @@ static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
> >>  static struct kprobe_blackpoint kprobe_blacklist[] = {
> >>  	{"preempt_schedule",},
> >>  	{"native_get_debugreg",},
> >> -	{"irq_entries_start",},
> >> -	{"common_interrupt",},
> >> -	{"mcount",},	/* mcount can be called from everywhere */
> > 
> > Is mcount in the entry.text section? Also, what about ftrace_caller and
> > friends.
> 
> I saw mcount(and ftrace_caller) in arch/x86/kernel/entry_*.S, and
> almost all code in it are in ".entry.text" section as far as I can see,
> or do I miss something?
> 

Ah, checking the System.map I guess we are OK.

-- Steve
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