This is a note to let you know that I've just added the patch titled

arm64: fix CONFIG_DEBUG_WX address reporting

to the 4.14-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: arm64-fix-config_debug_wx-address-reporting.patch and it can be found in the queue-4.14 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 1d08a044cf12aee37dfd54837558e3295287b343 Mon Sep 17 00:00:00 2001

From: Mark Rutland mark.rutland@arm.com Date: Wed, 13 Dec 2017 11:45:42 +0000 Subject: arm64: fix CONFIG_DEBUG_WX address reporting

From: Mark Rutland mark.rutland@arm.com

commit 1d08a044cf12aee37dfd54837558e3295287b343 upstream.

In ptdump_check_wx(), we pass walk_pgd() a start address of 0 (rather than VA_START) for the init_mm. This means that any reported W&X addresses are offset by VA_START, which is clearly wrong and can make them appear like userspace addresses.

Fix this by telling the ptdump code that we're walking init_mm starting at VA_START. We don't need to update the addr_markers, since these are still valid bounds regardless.

Fixes: 1404d6f13e47 ("arm64: dump: Add checking for writable and exectuable pages") Signed-off-by: Mark Rutland mark.rutland@arm.com Cc: Kees Cook keescook@chromium.org Cc: Laura Abbott labbott@redhat.com Reported-by: Timur Tabi timur@codeaurora.org Signed-off-by: Will Deacon will.deacon@arm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- arch/arm64/mm/dump.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/mm/dump.c +++ b/arch/arm64/mm/dump.c @@ -389,7 +389,7 @@ void ptdump_check_wx(void) .check_wx = true, };

- walk_pgd(&st, &init_mm, 0); + walk_pgd(&st, &init_mm, VA_START); note_page(&st, 0, 0, 0); if (st.wx_pages || st.uxn_pages) pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found, %lu non-UXN pages found\n",

Patches currently in stable-queue which might be from mark.rutland@arm.com are

queue-4.14/arm64-fix-config_debug_wx-address-reporting.patch