This is a note to let you know that I've just added the patch titled
parisc: Hide virtual kernel memory layout
to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: parisc-hide-virtual-kernel-memory-layout.patch and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
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"
Patches currently in stable-queue which might be from deller@gmx.de are
queue-4.15/parisc-hide-virtual-kernel-memory-layout.patch queue-4.15/parisc-use-cr16-interval-timers-unconditionally-on-qemu.patch queue-4.15/parisc-fix-ordering-of-cache-and-tlb-flushes.patch queue-4.15/parisc-reduce-irq-overhead-when-run-in-qemu.patch