UPSTREAM: x86/kasan: Write protect kasan zero shadow
After kasan_init() executed, no one is allowed to write to kasan_zero_page,
so write protect it.
BUG=b:69536083
TEST=Build and run image with KASAN enabled in KVM
Change-Id: I714f32cc1e5968d0b796ac2d7eb554d9645b8a24
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1452516679-32040-3-git-send-email-aryabinin@virtuozzo.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Guenter Roeck <groeck@chromium.org>
(cherry picked from commit 063fb3e56f6dd29b2633b678b837e1d904200e6f)
Reviewed-on: https://chromium-review.googlesource.com/782260
Reviewed-by: Aditya Kali <adityakali@google.com>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
1 file changed
