[PATCH v6 12/39] kmsan: Introduce memset_no_sanitize_memory()
From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: 2024-06-21 00:27:00
Also in:
linux-mm, linux-s390, lkml
Subsystem:
kmsan, the rest · Maintainers:
Alexander Potapenko, Linus Torvalds
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 --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 */
--
2.45.1