4.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Helge Deller <deller@xxxxxx>
commit fd8d0ca2563151204f3fe555dc8ca4bcfe8677a3 upstream.
For security reasons do not expose the virtual kernel memory layout to
userspace.
Signed-off-by: Helge Deller <deller@xxxxxx>
Suggested-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 4.15
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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"