diff mbox series

[v7,12/38] kmsan: Introduce memset_no_sanitize_memory()

Message ID 20240621113706.315500-13-iii@linux.ibm.com (mailing list archive)
State Handled Elsewhere
Headers show
Series kmsan: Enable on s390 | expand

Commit Message

Ilya Leoshkevich June 21, 2024, 11:34 a.m. UTC 
Add a wrapper for memset() that prevents unpoisoning. This is useful
for filling memory allocator redzones.

Reviewed-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 include/linux/kmsan.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/kmsan.h b/include/linux/kmsan.h
index 14b5ea6d3a43..7109644f4c19 100644
--- a/include/linux/kmsan.h
+++ b/include/linux/kmsan.h
@@ -255,6 +255,19 @@  void kmsan_enable_current(void);
  */
 void kmsan_disable_current(void);
 
+/**
+ * memset_no_sanitize_memory(): Fill memory without KMSAN instrumentation.
+ * @s: address of kernel memory to fill.
+ * @c: constant byte to fill the memory with.
+ * @n: number of bytes to fill.
+ *
+ * This is like memset(), but 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 +375,11 @@  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 */