On Fri, Nov 21, 2014 at 01:26:09PM -0800, Andy Lutomirski wrote: > This causes all non-NMI, non-double-fault kernel entries from > userspace to run on the normal kernel stack. Double-fault is > exempt to minimize confusion if we double-fault directly from > userspace due to a bad kernel stack. > > This is, suprisingly, simpler and shorter than the current code. It > removes the IMO rather frightening paranoid_userspace path, and it > make sync_regs much simpler. > > There is no risk of stack overflow due to this change -- the kernel > stack that we switch to is empty. > > This will also enable us to create non-atomic sections within > machine checks from userspace, which will simplify memory failure > handling. It will also allow the upcoming fsgsbase code to be > simplified, because it doesn't need to worry about usergs when > scheduling in paranoid_exit, as that code no longer exists. > > Cc: Oleg Nesterov <[email protected]> > Cc: Andi Kleen <[email protected]> > Cc: Tony Luck <[email protected]> > Cc: Borislav Petkov <[email protected]> > Signed-off-by: Andy Lutomirski <[email protected]>
Acked-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. -- -- 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/
