linux-kernel - Re: [PATCH] Switch proc interfaces in kernel/ to %pK

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Message-ID: <4D378D71.3050204@hitachi.com>
Date:	Thu, 20 Jan 2011 10:18:41 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Dan Rosenberg <drosenberg@...curity.com>
Cc:	Paul Menage <menage@...gle.com>, Li Zefan <lizf@...fujitsu.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Switch proc interfaces in kernel/ to %pK

(2011/01/20 0:04), Dan Rosenberg wrote:
> On Wed, 2011-01-19 at 10:29 +0900, Masami Hiramatsu wrote:
>> (2011/01/19 7:51), Dan Rosenberg wrote:
>>> Switch users of %p in /proc interfaces in kernel/ to %pK, to allow
>>> configuring the level of exposure of kernel pointers via the
>>> kptr_restrict sysctl.
>>
>> This report_probe interface is at /sys/kernel/debug/kprobes/list.
>> Is that policy applied to debugfs interface (for debug) too?
>> # in that case, you might update ftrace and perf tracing interfaces...
>>
> 
> There's no reason to not update ftrace and perf too, since I'd assume no
> one is using debugging interfaces without root privileges anyway.  I'll
> add them to my list.

OK, I see.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>


>>> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
>>> index 7798181..2437ca4 100644
>>> --- a/kernel/kprobes.c
>>> +++ b/kernel/kprobes.c
>>> @@ -2021,11 +2021,11 @@ static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
>>>  		kprobe_type = "k";
>>>  
>>>  	if (sym)
>>> -		seq_printf(pi, "%p  %s  %s+0x%x  %s ",
>>> +		seq_printf(pi, "%pK  %s  %s+0x%x  %s ",
>>>  			p->addr, kprobe_type, sym, offset,
>>>  			(modname ? modname : " "));
>>>  	else
>>> -		seq_printf(pi, "%p  %s  %p ",
>>> +		seq_printf(pi, "%pK  %s  %pK ",
>>>  			p->addr, kprobe_type, p->addr);
>>>  
>>>  	if (!pp)
>>
>>
>> -- 
>> Masami HIRAMATSU
>> 2nd Dept. Linux Technology Center
>> Hitachi, Ltd., Systems Development Laboratory
>> E-mail: masami.hiramatsu.pt@...achi.com
> 
> 


-- 
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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