| From fd8d0ca2563151204f3fe555dc8ca4bcfe8677a3 Mon Sep 17 00:00:00 2001 |
| From: Helge Deller <deller@gmx.de> |
| Date: Fri, 12 Jan 2018 22:57:15 +0100 |
| Subject: parisc: Hide virtual kernel memory layout |
| |
| From: Helge Deller <deller@gmx.de> |
| |
| commit fd8d0ca2563151204f3fe555dc8ca4bcfe8677a3 upstream. |
| |
| For security reasons do not expose the virtual kernel memory layout to |
| userspace. |
| |
| Signed-off-by: Helge Deller <deller@gmx.de> |
| Suggested-by: Kees Cook <keescook@chromium.org> |
| Cc: stable@vger.kernel.org # 4.15 |
| Reviewed-by: Kees Cook <keescook@chromium.org> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| arch/parisc/mm/init.c | 7 ++++++- |
| 1 file changed, 6 insertions(+), 1 deletion(-) |
| |
| --- a/arch/parisc/mm/init.c |
| +++ b/arch/parisc/mm/init.c |
| @@ -629,7 +629,12 @@ void __init mem_init(void) |
| #endif |
| |
| mem_init_print_info(NULL); |
| -#ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */ |
| + |
| +#if 0 |
| + /* |
| + * Do not expose the virtual kernel memory layout to userspace. |
| + * But keep code for debugging purposes. |
| + */ |
| printk("virtual kernel memory layout:\n" |
| " vmalloc : 0x%px - 0x%px (%4ld MB)\n" |
| " memory : 0x%px - 0x%px (%4ld MB)\n" |
