Comparing pointers with TASK_SIZE does not make sense when kernel and
userspace overlap. Assume that we are handling user memory access in
this case.
Reported-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
---
mm/kmsan/hooks.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/kmsan/hooks.c b/mm/kmsan/hooks.c
index 22e8657800ef..b408714f9ba3 100644
--- a/mm/kmsan/hooks.c
+++ b/mm/kmsan/hooks.c
@@ -267,7 +267,8 @@ void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy,
return;
ua_flags = user_access_save();
- if ((u64)to < TASK_SIZE) {
+ if (!IS_ENABLED(CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE) ||
+ (u64)to < TASK_SIZE) {
/* This is a user memory access, check it. */
kmsan_internal_check_memory((void *)from, to_copy - left, to,
REASON_COPY_TO_USER);
--
2.45.1
