linux-kernel - Re: [PATCH v7 3.2-rc2 5/30] uprobes: copy of the original instruction.

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Date:	Wed, 23 Nov 2011 21:52:10 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Stephen Wilson <wilsons@...rt.ca>
Subject: Re: [PATCH v7 3.2-rc2 5/30] uprobes: copy of the original
 instruction.

On Wed, 2011-11-23 at 14:49 -0500, Steven Rostedt wrote:
> On Wed, 2011-11-23 at 19:40 +0100, Peter Zijlstra wrote:
> > On Fri, 2011-11-18 at 16:37 +0530, Srikar Dronamraju wrote:
> > > +               /* TODO : Analysis and verification of instruction */
> > 
> > As in refuse to set a breakpoint on an instruction we can't deal with?
> > 
> > Do we care? The worst case we'll crash the program, but if we're allowed
> > setting uprobes we already have enough privileges to do that anyway,
> > right?
> 
> Well, I wouldn't be happy if I was running a server, and needed to
> analyze something it was doing, and because I screwed up the location of
> my probe, I crash the server, made lots of people unhappy and lose my
> job over it.
> 
> I think we do care, but it can be a TODO item.

But but but, why not let userspace sort it? And if you're going to
provide the kernel with inode:offset data yourself, you're already well
aware of wtf you're doing.


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