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kmsan: introduce memset_no_sanitize_memory()

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

Link: https://lkml.kernel.org/r/20240621113706.315500-13-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: <kasan-dev@googlegroups.com>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ilya Leoshkevich 2024-06-21 13:34:56 +02:00 committed by Andrew Morton
parent ec3e837d8f
commit 1fdb3c7006
1 changed files with 18 additions and 0 deletions
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18
include/linux/kmsan.h
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@ -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 */