Re: [RFC] [PATCH 4/7] Uprobes Implementation

[Jim Keniston]

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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