Re: [PATCH] mm: rcu-protected get_mm_exe_file()

[Konstantin Khlebnikov]

On 16.03.2015 17:50, Davidlohr Bueso wrote:
> On Mon, 2015-03-16 at 15:07 +0100, Oleg Nesterov wrote:
> > 	3. and we can remove down_write(mmap_sem) from prctl paths.
> >
> > 	   Actually we can do this even without xchg() above, but we might
> > 	   want to kill MMF_EXE_FILE_CHANGED and test_and_set_bit() check.
>
> Yeah I was waiting for security folks input about this, otherwise this
> still doesn't do it for me as we still have to deal with mmap_sem.

Why? mm->flags are updated atomically. mmap_sem isn't required here.

--
Konstantin
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