linux-kernel - Re: [PATCH -tip 2/2] [BUGFIX] kprobes/x86: Fix removed int3 checking order

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Date:	Thu, 29 Apr 2010 09:57:07 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Dave Anderson <anderson@...hat.com>
Subject: Re: [PATCH -tip 2/2] [BUGFIX] kprobes/x86: Fix removed int3
	checking order

On Wed, Apr 28, 2010 at 11:39:40AM -0400, Masami Hiramatsu wrote:
> Ananth N Mavinakayanahalli wrote:
> > On Tue, Apr 27, 2010 at 06:33:49PM -0400, Masami Hiramatsu wrote:

...

> > You may also want to fix up the comment on top of kprobe_handler() about
> > the interrupt gate as its only true for x86_32 and not x86_64, right?
> 
> Hmm, I couldn't find it, could you tell me more details?
> (and maybe, it's another issue)
> 
> what I could find is int3 handler is registered as interrupt gate
> on both of x86-32/64.
> 
> void __init trap_init(void)
> {
> ...
>         /* int3 can be called from all */
>         set_system_intr_gate_ist(3, &int3, DEBUG_STACK);

Ah, never mind. I was wrong. IIRC, before the 32-64 bit merger, 64bit
still used a trap gate.

Ananth
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