linux-kernel - Re: [PATCH] Kprobes blacklist: Conditionally add x86-specific symbols

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Message-ID: <20130308131534.GI26148@caracas.corpusers.net>
Date:	Fri, 8 Mar 2013 14:15:35 +0100
From:	<oskar.andero@...ymobile.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"anil.s.keshavamurthy@...el.com" <anil.s.keshavamurthy@...el.com>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	"Lekanovic, Radovan" <Radovan.Lekanovic@...ymobile.com>,
	Davidsson, Björn 
	<Bjorn.Davidsson@...ymobile.com>
Subject: Re: [PATCH] Kprobes blacklist: Conditionally add x86-specific symbols

On 05:23 Fri 08 Mar     , Masami Hiramatsu wrote:
> (2013/03/07 19:44), oskar.andero@...ymobile.com wrote:
> > From: Bjorn Davidsson <bjorn.davidsson@...ymobile.com>
> > 
> > The kprobes blacklist contains x86-specific symbols.
> > Looking for these in kallsyms takes unnecessary time
> > during startup on non-X86 platform.
> > Added #ifdef CONFIG_X86 around them.
> 
> Right. however, it might be better break that into
> common and arch-specific lists, because there may be
> other arch-specific non-probe-able functions on each
> architecture...

Ok. You mean adding, for instance, a kprobe_blacklist_arch[] in arch/x86
somewhere or did you have something else in mind? I guess we preferably want
to get rid of the #ifdef.

> Would you know some other black points on your platform?

Not that we are aware of.

> Thank you,
> 
> > 
> > Reviewed-by: Radovan Lekanovic <radovan.lekanovic@...ymobile.com>
> > Signed-off-by: Björn Davidsson <bjorn.davidsson@...ymobile.com>
> > Signed-off-by: Oskar Andero <oskar.andero@...ymobile.com>
> > ---
> >  kernel/kprobes.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> > 
> > diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> > index e35be53..8c3796f 100644
> > --- a/kernel/kprobes.c
> > +++ b/kernel/kprobes.c
> > @@ -95,9 +95,11 @@ static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
> >   */
> >  static struct kprobe_blackpoint kprobe_blacklist[] = {
> >  	{"preempt_schedule",},
> > +#ifdef CONFIG_X86
> >  	{"native_get_debugreg",},
> >  	{"irq_entries_start",},
> >  	{"common_interrupt",},
> > +#endif
> >  	{"mcount",},	/* mcount can be called from everywhere */
> >  	{NULL}    /* Terminator */
> >  };
> > 
> 
> 
> -- 
> Masami HIRAMATSU
> IT Management Research Dept. Linux Technology Center
> Hitachi, Ltd., Yokohama Research Laboratory
> E-mail: masami.hiramatsu.pt@...achi.com
> 
> 

-Oskar
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