linux-kernel - Re: [PATCH -tip tracing/kprobes 3/6] kprobes/x86: Fix to add __kprobes to in-kernel fault handing functions

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Date:	Sat, 29 Aug 2009 22:49:47 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [PATCH -tip tracing/kprobes 3/6] kprobes/x86: Fix to add	__kprobes
 to in-kernel fault handing functions

Frederic Weisbecker wrote:
> On Thu, Aug 27, 2009 at 01:23:11PM -0400, Masami Hiramatsu wrote:
>> Add __kprobes to the functions which handles in-kernel fixable page faults.
>> Since kprobes can cause those in-kernel page faults by accessing kprobe data
>> structures, probing those fault functions will cause fault-int3-loop
>> (do_page_fault has already been marked as __kprobes).
> 
> 
> BTW, is it possible to assert a struct kprobe (and its pointer members)
> haven't been allocated through vmalloc() ?
> 

How about calling vmalloc_sync() always before registering kprobes? :-)

Thank you,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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