kasan, arm64: enable top byte ignore for the kernel
authorAndrey Konovalov <andreyknvl@google.com>
Fri, 28 Dec 2018 08:30:31 +0000 (00:30 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 28 Dec 2018 20:11:43 +0000 (12:11 -0800)
commit21696c1613244f2ad4e9216c4f6e7804831a992c
treee6c87ca92199cdff892ee99afe2a3c7f3d960380
parent356607f21e603523d4b0a4f918722845214fc6a8
kasan, arm64: enable top byte ignore for the kernel

Tag-based KASAN uses the Top Byte Ignore feature of arm64 CPUs to store a
pointer tag in the top byte of each pointer.  This commit enables the
TCR_TBI1 bit, which enables Top Byte Ignore for the kernel, when tag-based
KASAN is used.

Link: http://lkml.kernel.org/r/f51eca084c8cdb2f3a55195fe342dc8953b7aead.1544099024.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/arm64/include/asm/pgtable-hwdef.h
arch/arm64/mm/proc.S