kasan: Extend KASAN mode kernel parameter

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Architectures supported by KASAN_HW_TAGS can provide an asymmetric mode
of execution. On an MTE enabled arm64 hw for example this can be
identified with the asymmetric tagging mode of execution. In particular,
when such a mode is present, the CPU triggers a fault on a tag mismatch
during a load operation and asynchronously updates a register when a tag
mismatch is detected during a store operation.

Extend the KASAN HW execution mode kernel command line parameter to
support asymmetric mode.

Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Link: https://lore.kernel.org/r/20211006154751.4463-6-vincenzo.frascino@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

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This commit is contained in:

Vincenzo Frascino 2021-10-06 16:47:51 +01:00 • committed by Will Deacon

parent ec0288369f

commit 2d27e58514

5 changed files with 52 additions and 18 deletions

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7

Documentation/dev-tools/kasan.rst

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2

lib/test_kasan.c

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29

mm/kasan/hw_tags.c

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30

mm/kasan/kasan.h

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2

mm/kasan/report.c

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