On Thu, Dec 10, 2015 at 11:47:18AM -0800, Kees Cook wrote: > In open, sure, but what about under mm/memory.c where we're trying to > twiddle it from vma->file->f_flags as in my patch? That seemed like it > would want atomic safety.
Sigh... Again, I'm not at all convinced that this is the right approach, but generally you need ->f_lock. And in situations where the bit can go only off->on, check it lockless, skip the whole thing entirely if it's already set and grab the spinlock otherwise. -- 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/
