4.15-stable review patch. If anyone has any objections, please let me know.
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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"