linux-kernel - Re: [PATCH 08/12] add trace events for each syscall entry/exit

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Message-ID: <20090826171018.GD21456@Krystal>
Date:	Wed, 26 Aug 2009 13:10:18 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, laijs@...fujitsu.com, rostedt@...dmis.org,
	jiayingz@...gle.com, mbligh@...gle.com, lizf@...fujitsu.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>
Subject: Re: [PATCH 08/12] add trace events for each syscall entry/exit

* Peter Zijlstra (peterz@...radead.org) wrote:
> On Tue, 2009-08-25 at 14:31 -0400, Mathieu Desnoyers wrote:
> > For instance, some
> > proprietary Linux driver does very odd things with system calls within
> > kernel threads, like invoking them with int 0x80.
> 
> So who is going to send the x86 patch to make int 0x80 from kernel space
> panic the machine? :-)

I'm pretty sure ATI or Nvidia already cooked something like this in the
past. Let's not bother too much with the proprietary aspect. Tracing
internal kernel invocations of sys_*() is actually the main point I was
trying to come to.

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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