linux-kernel - Re: [RFC] [PATCH 2.6.37-rc5-tip 11/20] 11: uprobes: slot allocation for uprobes

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Message-ID: <1295963776.28776.1057.camel@laptop>
Date:	Tue, 25 Jan 2011 14:56:16 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	SystemTap <systemtap@...rces.redhat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC] [PATCH 2.6.37-rc5-tip 11/20] 11: uprobes: slot
 allocation for uprobes

On Thu, 2010-12-16 at 15:29 +0530, Srikar Dronamraju wrote:
> +       /*
> +        * We keep the vma's vm_start rather than a pointer to the vma
> +        * itself.  The probed process or a naughty kernel module could make
> +        * the vma go away, and we must handle that reasonably gracefully.
> +        */
> +       unsigned long vaddr;            /* Page(s) of instruction slots */ 

You could simply refuse to let the user unmap that area and rogue kernel
modules aren't something you can do anything about anyway.

But yeah..
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