4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kees Cook <keescook@xxxxxxxxxxxx> Make sure dmesg reports when KPTI is enabled. Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/mm/kaiser.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/arch/x86/mm/kaiser.c +++ b/arch/x86/mm/kaiser.c @@ -10,6 +10,9 @@ #include <linux/mm.h> #include <linux/uaccess.h> +#undef pr_fmt +#define pr_fmt(fmt) "Kernel/User page tables isolation: " fmt + #include <asm/kaiser.h> #include <asm/tlbflush.h> /* to verify its kaiser declarations */ #include <asm/pgtable.h> @@ -292,7 +295,7 @@ enable: return; disable: - pr_info("Kernel/User page tables isolation: disabled\n"); + pr_info("disabled\n"); silent_disable: kaiser_enabled = 0; @@ -352,6 +355,8 @@ void __init kaiser_init(void) kaiser_add_user_map_early(&debug_idt_table, sizeof(gate_desc) * NR_VECTORS, __PAGE_KERNEL); + + pr_info("enabled\n"); } /* Add a mapping to the shadow mapping, and synchronize the mappings */