This will be used to enable/disable Kernel Userspace Execution Prevention (KUEP).
Signed-off-by: Aneesh Kumar K.V <[email protected]> --- arch/powerpc/include/asm/mmu.h | 5 +++++ arch/powerpc/mm/book3s64/radix_pgtable.c | 4 +++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h index 72966d3d8f64..94435f85e3bc 100644 --- a/arch/powerpc/include/asm/mmu.h +++ b/arch/powerpc/include/asm/mmu.h @@ -24,6 +24,7 @@ /* Radix page table supported and enabled */ #define MMU_FTR_TYPE_RADIX ASM_CONST(0x00000040) #define MMU_FTR_PKEY ASM_CONST(0x00000080) +#define MMU_FTR_KUEP ASM_CONST(0x00000100) /* * Individual features below. @@ -181,6 +182,10 @@ enum { #ifdef CONFIG_PPC_MEM_KEYS MMU_FTR_PKEY | #endif +#ifdef CONFIG_PPC_KUEP + MMU_FTR_KUEP | +#endif /* CONFIG_PPC_KUAP */ + 0, }; diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c index 8acb96de0e48..04fd749c6339 100644 --- a/arch/powerpc/mm/book3s64/radix_pgtable.c +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c @@ -520,8 +520,10 @@ 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 -- 2.26.2
