[PATCH v5 12/37] kmsan: Introduce memset_no_sanitize_memory()

Ilya Leoshkevich
2024-06-19T15:46:08Z

Add a wrapper for memset() that prevents unpoisoning. This is useful
for filling memory allocator redzones.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
include/linux/kmsan.h | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/include/linux/kmsan.h b/include/linux/kmsan.h
index 23de1b3d6aee..5f50885f2023 100644
--- a/include/linux/kmsan.h
+++ b/include/linux/kmsan.h
@@ -255,6 +255,14 @@ void kmsan_enable_current(void);
*/
void kmsan_disable_current(void);

+/*
+ * memset_no_sanitize_memory(): memset() without KMSAN instrumentation.
+ */
+static inline void *memset_no_sanitize_memory(void *s, int c, size_t n)
+{
+ return __memset(s, c, n);
+}
+
#else

static inline void kmsan_init_shadow(void)
@@ -362,6 +370,11 @@ static inline void kmsan_disable_current(void)
{
}

+static inline void *memset_no_sanitize_memory(void *s, int c, size_t n)
+{
+ return memset(s, c, n);
+}
+
#endif

#endif /* _LINUX_KMSAN_H */
--
2.45.1