Re: [PATCH 6/7] mm: kill vma flag VM_EXECUTABLE

[Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>]

Cyrill Gorcunov wrote:
> On Sat, Mar 31, 2012 at 10:13:24PM +0200, Oleg Nesterov wrote:
> > Add Cyrill. This conflicts with
> > c-r-prctl-add-ability-to-set-new-mm_struct-exe_file.patch in -mm.
>
> Thanks for CC'ing, Oleg. I think if thise series go in it won't
> be a problem to update my patch accordingly.

In this patch I leave mm->exe_file lockless.
After exec/fork we can change it only for current task and only if mm->mm_users == 1.

something like this:

task_lock(current);
if (atomic_read(&current->mm->mm_users) == 1)
	set_mm_exe_file(current->mm, new_file);
else
	ret = -EBUSY;
task_unlock(current);

task_lock() protect this code against get_task_mm()

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