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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
