Merging upstream version 6.9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 11 insertions, 4 deletions

diff --git a/mm/kmsan/core.c b/mm/kmsan/core.c
index cf2d70e9c9..95f859e38c 100644
--- a/mm/kmsan/core.c
+++ b/mm/kmsan/core.c
@@ -196,8 +196,7 @@ void kmsan_internal_set_shadow_origin(void *addr, size_t size, int b,
 				      u32 origin, bool checked)
 {
 	u64 address = (u64)addr;
-	void *shadow_start;
-	u32 *origin_start;
+	u32 *shadow_start, *origin_start;
 	size_t pad = 0;
 
 	KMSAN_WARN_ON(!kmsan_metadata_is_contiguous(addr, size));
@@ -225,8 +224,16 @@ void kmsan_internal_set_shadow_origin(void *addr, size_t size, int b,
 	origin_start =
 		(u32 *)kmsan_get_metadata((void *)address, KMSAN_META_ORIGIN);
 
-	for (int i = 0; i < size / KMSAN_ORIGIN_SIZE; i++)
-		origin_start[i] = origin;
+	/*
+	 * If the new origin is non-zero, assume that the shadow byte is also non-zero,
+	 * and unconditionally overwrite the old origin slot.
+	 * If the new origin is zero, overwrite the old origin slot iff the
+	 * corresponding shadow slot is zero.
+	 */
+	for (int i = 0; i < size / KMSAN_ORIGIN_SIZE; i++) {
+		if (origin || !shadow_start[i])
+			origin_start[i] = origin;
+	}
 }
 
 struct page *kmsan_vmalloc_to_page_or_null(void *vaddr)