linux-kernel - Re: Re: Re: Re: Re: [PATCH -tip v3 00/23] kprobes: introduce NOKPROBE_SYMBOL() and general cleaning of kprobe blacklist

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Date:	Sun, 01 Dec 2013 11:16:34 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>, linux-arch@...r.kernel.org,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>, x86@...nel.org,
	lkml <linux-kernel@...r.kernel.org>,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	virtualization@...ts.linux-foundation.org,
	systemtap@...rceware.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: Re: Re: Re: Re: [PATCH -tip v3 00/23] kprobes: introduce NOKPROBE_SYMBOL()
 and general cleaning of kprobe blacklist

(2013/11/30 22:46), Ingo Molnar wrote:
>>>> Anyway, to fix all of them, I think we need file-based blacklist
>>>> especially for assembler symbols.
>>>
>>> assembler symbols shouldn't be particular hard either, just put them 
>>> into the noprobes section.
>>
>> Would you mean .kprobes.text? Hmm, I hope not to use it anymore, but 
>> yeah, bugfix is more important. Agreed.
> 
> No, why not put the symbol address into the 'blacklist' section, 
> within the asm file? We fill out exception table entries in .S files 
> as well, see the _ASM_EXTABLE() macro, it's possible to do all that. 

Oh! I got it. Thank you for the pointer! :)

> 
> It needs not a CPP macro but an assembly macro.

OK, I'll try that.

Thanks again,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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