Messages in this thread Patch in this message | | | Date | Tue, 25 Jul 2017 15:59:04 +0100 | From | Mark Rutland <> | Subject | Re: [RFC 7/9] arm64: expose PAC bit positions via ptrace |
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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.
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