[PATCH v6 05/39] kmsan: Fix is_bad_asm_addr() on arches with overlapping address spaces
From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: 2024-06-21 00:26:56
Also in:
linux-s390, lkml
Subsystem:
kmsan, memory management, the rest · Maintainers:
Alexander Potapenko, Andrew Morton, Linus Torvalds
Comparing pointers with TASK_SIZE does not make sense when kernel and userspace overlap. Skip the comparison when this is the case. Reviewed-by: Alexander Potapenko <glider@google.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> --- mm/kmsan/instrumentation.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/kmsan/instrumentation.c b/mm/kmsan/instrumentation.c
index 470b0b4afcc4..8a1bbbc723ab 100644
--- a/mm/kmsan/instrumentation.c
+++ b/mm/kmsan/instrumentation.c@@ -20,7 +20,8 @@ static inline bool is_bad_asm_addr(void *addr, uintptr_t size, bool is_store) { - if ((u64)addr < TASK_SIZE) + if (IS_ENABLED(CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE) && + (u64)addr < TASK_SIZE) return true; if (!kmsan_get_metadata(addr, KMSAN_META_SHADOW)) return true;
--
2.45.1