That patch is entirely insane. No way in hell will that ever get merged. copy_to/from_user() is some of the most performance-critical code, and runs a *lot*, often for fairly small structures (ie 'fstat()' etc). Adding random ad-hoc tests to it is entirely inappropriate. Doing so unconditionally is insane. So NAK, NAK, NAK. If you seriously clean it up (that at a minimum includes things like making it configurable using some pretty helper function that just compiles away for all the normal cases, and not writing out if (!slab_access_ok(to, n) || !stack_access_ok(to, n)) multiple times, for chrissake) it _might_ be acceptable. But in its current form it's just total crap. It's exactly the kind of "crazy security people who don't care about anything BUT security" crap that I refuse to see. Some balance and sanity. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html