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From: Masami Hiramatsu <mhiramat@redhat.com>
To: Abhishek Sagar <sagar.abhishek@gmail.com>
Cc: ananth@in.ibm.com, LKML <linux-kernel@vger.kernel.org>,
	jkenisto@us.ibm.com, Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 0/3][RFC] x86: Catch stray non-kprobe breakpoints
Date: Tue, 29 Jan 2008 10:13:21 -0500	[thread overview]
Message-ID: <479F4291.1060106@redhat.com> (raw)
In-Reply-To: <863e9df20801290240t6c724cb9x145fd6b1ca4f3c78@mail.gmail.com>

Abhishek Sagar wrote:
> Placing a breakpoint on kprobe_handler (say) can loop into a recursive
> trap without allowing the debugger's notifier chain to be invoked. I'm
> assuming that non-kprobe exception notifiers may (or even should) run
> after kprobe's notifier callback (kprobe_exceptions_notify).

In that case, why don't you just reduce the priority of kprobe_exceptions_nb?
Then, the execution path becomes very simple.

int3 (non-kprobe) -> do_int3 -> non-krpobe/debugger

I also like to use a debugger for debugging kprobes. that will help us.

Best Regards,

-- 
Masami Hiramatsu

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

e-mail: mhiramat@redhat.com


  parent reply	other threads:[~2008-01-29 15:13 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-27  9:08 Abhishek Sagar
2008-01-29  6:02 ` Ananth N Mavinakayanahalli
2008-01-29 10:40   ` Abhishek Sagar
2008-01-29 13:18     ` Ananth N Mavinakayanahalli
2008-01-29 17:24       ` Abhishek Sagar
2008-01-29 15:13     ` Masami Hiramatsu [this message]
2008-01-29 18:08       ` Abhishek Sagar
2008-01-29 19:29         ` Masami Hiramatsu
2008-01-30  4:07           ` Ananth N Mavinakayanahalli

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