[PATCH v2 17/33] mm: kfence: Disable KMSAN when checking the canary

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KMSAN warns about check_canary() accessing the canary.

The reason is that, even though set_canary() is properly instrumented
and sets shadow, slub explicitly poisons the canary's address range

Unpoisoning the canary is not the right thing to do: only
check_canary() is supposed to ever touch it. Instead, disable KMSAN
checks around canary read accesses.

Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
 mm/kfence/core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 3872528d0963..a2ea8e5a1ad9 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -306,7 +306,7 @@ metadata_update_state(struct kfence_metadata *meta, enum kfence_object_state nex
 /* Check canary byte at @addr. */
-static inline bool check_canary_byte(u8 *addr)
+__no_kmsan_checks static inline bool check_canary_byte(u8 *addr)
 	struct kfence_metadata *meta;
 	unsigned long flags;
@@ -341,7 +341,8 @@ static inline void set_canary(const struct kfence_metadata *meta)
 		*((u64 *)addr) = KFENCE_CANARY_PATTERN_U64;
-static inline void check_canary(const struct kfence_metadata *meta)
+__no_kmsan_checks static inline void
+check_canary(const struct kfence_metadata *meta)
 	const unsigned long pageaddr = ALIGN_DOWN(meta->addr, PAGE_SIZE);
 	unsigned long addr = pageaddr;

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