[PATCH v5 07/17] arm64: add basic pointer authentication support
From: catalin.marinas@arm.com (Catalin Marinas)
Date: 2018-10-19 11:15:51
Also in:
kvmarm, linux-arch, lkml
On Fri, Oct 05, 2018 at 09:47:44AM +0100, Kristina Martsenko wrote:
quoted hunk ↗ jump to hunk
diff --git a/arch/arm64/include/asm/pointer_auth.h b/arch/arm64/include/asm/pointer_auth.h new file mode 100644 index 000000000000..2aefedc31d9e --- /dev/null +++ b/arch/arm64/include/asm/pointer_auth.h@@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef __ASM_POINTER_AUTH_H +#define __ASM_POINTER_AUTH_H + +#include <linux/random.h> + +#include <asm/cpufeature.h> +#include <asm/sysreg.h> + +#ifdef CONFIG_ARM64_PTR_AUTH +/* + * Each key is a 128-bit quantity which is split across a pair of 64-bit + * registers (Lo and Hi). + */ +struct ptrauth_key { + unsigned long lo, hi; +}; + +/* + * We give each process its own instruction A key (APIAKey), which is shared by + * all threads. This is inherited upon fork(), and reinitialised upon exec*(). + * All other keys are currently unused, with APIBKey, APDAKey, and APBAKey + * instructions behaving as NOPs. + */
I don't remember the past discussions but I assume the tools guys are ok with a single key shared by multiple threads. Ramana, could you ack this part, FTR? (and it would help if someone from the Android and Chrome camps can confirm) Thanks. -- Catalin