linux-kernel - Re: [RFC] [PATCH 4/7] Uprobes Implementation

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Message-Id: <1263599085.5007.88.camel@localhost.localdomain>
Date:	Fri, 15 Jan 2010 15:44:45 -0800
From:	Jim Keniston <jkenisto@...ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	maneesh@...ibm.com, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	utrace-devel <utrace-devel@...hat.com>,
	Mark Wielaard <mjw@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 4/7] Uprobes Implementation

On Fri, 2010-01-15 at 12:12 +0100, Peter Zijlstra wrote:
...
> 
> Adding the probe uses the fact that (most) executable mappings are
> MAP_PRIVATE and CoWs a private copy of the page with the modified ins,
> right?
> 
> What does it do for MAP_SHARED|MAP_EXECUTABLE sections -- simply fail to
> add the probe?

If the vma containing the instruction to be probed has the VM_EXEC flag
set (and it's not in the XOL area) we go ahead and try to probe it.  I'm
not familar with the implications of MAP_SHARED|MAP_EXECUTABLE -- how
you would get such a combo, or what access_process_vm() would do with
it.

Jim 

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