Commit ae80e162 authored by Mark Brown's avatar Mark Brown Committed by Catalin Marinas
Browse files

mm: Define VM_SHADOW_STACK for arm64 when we support GCS 



Use VM_HIGH_ARCH_5 for guarded control stack pages.

Reviewed-by: default avatarThiago Jung Bauermann <thiago.bauermann@linaro.org>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241001-arm64-gcs-v13-14-222b78d87eee@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 092055f1

Documentation/filesystems/proc.rst

+1 −1
Original line number Diff line number Diff line
@@ -579,7 +579,7 @@ encoded manner. The codes are the following: 
    mt    arm64 MTE allocation tags are enabled

    um    userfaultfd missing tracking

    uw    userfaultfd wr-protect tracking

    ss    shadow stack page

    ss    shadow/guarded control stack page

    sl    sealed

    ==    =======================================

include/linux/mm.h

+11 −1
Original line number Diff line number Diff line
@@ -367,7 +367,17 @@ extern unsigned int kobjsize(const void *objp); 
 * for more details on the guard size.

 */

# define VM_SHADOW_STACK	VM_HIGH_ARCH_5

#else

#endif



#if defined(CONFIG_ARM64_GCS)

/*

 * arm64's Guarded Control Stack implements similar functionality and

 * has similar constraints to shadow stacks.

 */

# define VM_SHADOW_STACK	VM_HIGH_ARCH_6

#endif



#ifndef VM_SHADOW_STACK

# define VM_SHADOW_STACK	VM_NONE

#endif