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authorVincenzo Frascino <vincenzo.frascino@arm.com>2021-03-15 13:20:12 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2021-04-11 10:56:39 +0100
commit2603f8a78dfb1d54f62dbacc490ea44aa6d80e04 (patch)
treed8251bbee5ff9c3e60ae9bb32f10601ff4775387 /lib
parentf3b7deef8dcaf84fd659108ae300626ea5420f87 (diff)
downloadlinux-2603f8a78dfb1d54f62dbacc490ea44aa6d80e04.tar.gz
kasan: Add KASAN mode kernel parameter
Architectures supported by KASAN_HW_TAGS can provide a sync or async mode of execution. On an MTE enabled arm64 hw for example this can be identified with the synchronous or asynchronous tagging mode of execution. In synchronous mode, an exception is triggered if a tag check fault occurs. In asynchronous mode, if a tag check fault occurs, the TFSR_EL1 register is updated asynchronously. The kernel checks the corresponding bits periodically. KASAN requires a specific kernel command line parameter to make use of this hw features. Add KASAN HW execution mode kernel command line parameter. Note: This patch adds the kasan.mode kernel parameter and the sync/async kernel command line options to enable the described features. [ Add a new var instead of exposing kasan_arg_mode to be consistent with flags for other command line arguments. ] Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Andrey Konovalov <andreyknvl@google.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Andrey Konovalov <andreyknvl@google.com> Tested-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Link: https://lore.kernel.org/r/20210315132019.33202-3-vincenzo.frascino@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/test_kasan.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index e5647d147b35..479c31a5dc21 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -97,7 +97,7 @@ static void kasan_test_exit(struct kunit *test)
READ_ONCE(fail_data.report_found)); \
if (IS_ENABLED(CONFIG_KASAN_HW_TAGS)) { \
if (READ_ONCE(fail_data.report_found)) \
- kasan_enable_tagging(); \
+ kasan_enable_tagging_sync(); \
migrate_enable(); \
} \
} while (0)