diff options
Diffstat (limited to 'arch/powerpc/mm/pgtable-radix.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable-radix.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index 8616b291bcec..45869fd698a0 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -29,6 +29,7 @@ #include <asm/powernv.h> #include <asm/sections.h> #include <asm/trace.h> +#include <asm/uaccess.h> #include <trace/events/thp.h> @@ -549,6 +550,24 @@ void setup_kuep(bool disabled) } #endif +#ifdef CONFIG_PPC_KUAP +void setup_kuap(bool disabled) +{ + if (disabled || !early_radix_enabled()) + return; + + if (smp_processor_id() == boot_cpuid) { + pr_info("Activating Kernel Userspace Access Prevention\n"); + cur_cpu_spec->mmu_features |= MMU_FTR_RADIX_KUAP; + } + + /* Make sure userspace can't change the AMR */ + mtspr(SPRN_UAMOR, 0); + mtspr(SPRN_AMR, AMR_KUAP_BLOCKED); + isync(); +} +#endif + void __init radix__early_init_mmu(void) { unsigned long lpcr; |