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

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Message-ID: <20111124182015.4ef4b86a.srikar@linux.vnet.ibm.com>
Date:	Thu, 24 Nov 2011 18:20:15 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	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>,
	Steven Rostedt <rostedt@...dmis.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, 23 Nov 2011 19:40:16 +0100
Peter Zijlstra <peterz@...radead.org> 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?
> 

I think we should and we do care. 
That's already implemented in the subsequent patches too.
For example: we don't a trace breakpoint instruction.

-- 
Thanks and Regards
Srikar

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