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kasan: allow enabling stack tagging for tag-based mode 

Use CONFIG_KASAN_STACK to enable stack tagging.

Note, that HWASAN short granules [1] are disabled. Supporting those will
require more kernel changes.

[1] https://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Elena Petrova <lenaptr@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Link: http://lkml.kernel.org/r/e7febb907b539c3730780df587ce0b38dc558c3d.1596199677.git.andreyknvl@google.com
Link: http://lkml.kernel.org/r/99f7d90a4237431bf5988599fb41358e92876eb0.1596544734.git.andreyknvl@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2020-08-06 23:25:08 -07:00 committed by Linus Torvalds
parent f9409d58e9
commit cae9dc35ed
1 changed files with 2 additions and 1 deletions
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3
scripts/Makefile.kasan
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@ -44,7 +44,8 @@ else
endif
CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
-mllvm -hwasan-instrument-stack=0 \
-mllvm -hwasan-instrument-stack=$(CONFIG_KASAN_STACK) \
-mllvm -hwasan-use-short-granules=0 \
$(instrumentation_flags)
endif # CONFIG_KASAN_SW_TAGS