On Tue, Jul 25, 2017 at 01:11:48PM +0100, Dave Martin wrote: > On Mon, Apr 03, 2017 at 04:19:23PM +0100, Mark Rutland wrote: > > +/* > > + * The pointer bits used by a pointer authentication code. > > + * If we were to use tagged pointers, bits 63:56 would also apply. > > + */ > > +#define ptrauth_pac_mask() GENMASK(54, VA_BITS) > > Tagged pointers _are_ enabled for userspace by default, no? Yes; I'd meant s/tagged/untagged/. I've corrected this to: /* * The EL0 pointer bits used by a pointer authentication code. * This is dependent on TBI0 being enabled, or bits 63:56 would also apply. */ > > diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h > > index b59ee07..cae3d1e 100644 > > --- a/include/uapi/linux/elf.h > > +++ b/include/uapi/linux/elf.h > > @@ -414,6 +414,7 @@ > > #define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */ > > #define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */ > > #define NT_ARM_SYSTEM_CALL 0x404 /* ARM system call number */ > > +#define NT_ARM_PAC_MASK 0x405 /* ARM pointer authentication code masks */ > > The is the value tentatively assigned to NT_ARM_SVE. I must've generated this patch before I corrected this; my local branch (and kernel.org) have 0x406 here. Sorry about that. Mark.
