powerpc/book3s64/kuep: Add MMU_FTR_KUEP (e10cc871) · Commits · 戴 / test

This will be used to enable/disable Kernel Userspace Execution Prevention (KUEP). Signed-off-by:

arch/powerpc/include/asm/mmu.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,11 @@
		* Individual features below.
		*/

		/*
		* Support for KUEP feature.
		*/
		#define MMU_FTR_KUEP ASM_CONST(0x00000400)

		/*
		* Support for memory protection keys.
		*/
		@@ -189,6 +194,10 @@ enum {
		#ifdef CONFIG_PPC_MEM_KEYS
		MMU_FTR_PKEY \|
		#endif
		#ifdef CONFIG_PPC_KUEP
		MMU_FTR_KUEP \|
		#endif /* CONFIG_PPC_KUAP */

		0,
		};

+3 −1

Original line number	Diff line number	Diff line
		@@ -593,8 +593,10 @@ void setup_kuep(bool disabled)
		if (disabled \|\| !early_radix_enabled())
		return;

		if (smp_processor_id() == boot_cpuid)
		if (smp_processor_id() == boot_cpuid) {
		pr_info("Activating Kernel Userspace Execution Prevention\n");
		cur_cpu_spec->mmu_features \|= MMU_FTR_KUEP;
		}

		/*
		* Radix always uses key0 of the IAMR to determine if an access is