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

[Ilya Leoshkevich]

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

Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
---
 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