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Subject[PATCH 4.15 027/122] parisc: Hide virtual kernel memory layout
Date
4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

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"

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