| From keescook@chromium.org Wed Jan 3 20:48:07 2018 |
| From: Kees Cook <keescook@chromium.org> |
| Date: Wed, 3 Jan 2018 10:18:01 -0800 |
| Subject: KPTI: Report when enabled |
| To: Greg KH <gregkh@linuxfoundation.org> |
| Message-ID: <20180103181801.GA33383@beast> |
| Content-Disposition: inline |
| |
| From: Kees Cook <keescook@chromium.org> |
| |
| Make sure dmesg reports when KPTI is enabled. |
| |
| Signed-off-by: Kees Cook <keescook@chromium.org> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| 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 */ |
