diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/kup.h | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/fault.c | 9 | ||||
| -rw-r--r-- | arch/powerpc/mm/init-common.c | 11 | ||||
| -rw-r--r-- | arch/powerpc/platforms/Kconfig.cputype | 12 |
4 files changed, 33 insertions, 5 deletions
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h index 7a88b8b9b54d..a2a959cb4e36 100644 --- a/arch/powerpc/include/asm/kup.h +++ b/arch/powerpc/include/asm/kup.h @@ -6,6 +6,12 @@ void setup_kup(void); +#ifdef CONFIG_PPC_KUEP +void setup_kuep(bool disabled); +#else +static inline void setup_kuep(bool disabled) { } +#endif /* CONFIG_PPC_KUEP */ + #endif /* !__ASSEMBLY__ */ #endif /* _ASM_POWERPC_KUP_H_ */ diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index 887f11bcf330..3384354abc1d 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -229,11 +229,10 @@ static bool bad_kernel_fault(bool is_exec, unsigned long error_code, /* NX faults set DSISR_PROTFAULT on the 8xx, DSISR_NOEXEC_OR_G on others */ if (is_exec && (error_code & (DSISR_NOEXEC_OR_G | DSISR_KEYFAULT | DSISR_PROTFAULT))) { - printk_ratelimited(KERN_CRIT "kernel tried to execute" - " exec-protected page (%lx) -" - "exploit attempt? (uid: %d)\n", - address, from_kuid(&init_user_ns, - current_uid())); + pr_crit_ratelimited("kernel tried to execute %s page (%lx) - exploit attempt? (uid: %d)\n", + address >= TASK_SIZE ? "exec-protected" : "user", + address, + from_kuid(&init_user_ns, current_uid())); } return is_exec || (address >= TASK_SIZE); } diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c index 36d28e872289..83f95a5565d6 100644 --- a/arch/powerpc/mm/init-common.c +++ b/arch/powerpc/mm/init-common.c @@ -26,8 +26,19 @@ #include <asm/pgtable.h> #include <asm/kup.h> +static bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); + +static int __init parse_nosmep(char *p) +{ + disable_kuep = true; + pr_warn("Disabling Kernel Userspace Execution Prevention\n"); + return 0; +} +early_param("nosmep", parse_nosmep); + void __init setup_kup(void) { + setup_kuep(disable_kuep); } #define CTOR(shift) static void ctor_##shift(void *addr) \ diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 842b2c7e156a..7d30bbbaa3c1 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -345,6 +345,18 @@ config PPC_RADIX_MMU_DEFAULT If you're unsure, say Y. +config PPC_HAVE_KUEP + bool + +config PPC_KUEP + bool "Kernel Userspace Execution Prevention" + depends on PPC_HAVE_KUEP + default y + help + Enable support for Kernel Userspace Execution Prevention (KUEP) + + If you're unsure, say Y. + config ARCH_ENABLE_HUGEPAGE_MIGRATION def_bool y depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION |