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kmsan: expose KMSAN_WARN_ON()

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KMSAN_WARN_ON() is required for implementing s390-specific KMSAN
functions, but right now it's available only to the KMSAN internal
functions.  Expose it to subsystems through <linux/kmsan.h>.

Link: https://lkml.kernel.org/r/20240621113706.315500-17-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 13:35:00 +02:00
committed by Andrew Morton
parent d1dac751f4
commit e6553e2f79
2 changed files with 26 additions and 23 deletions
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25
include/linux/kmsan.h
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@@ -268,6 +268,29 @@ static inline void *memset_no_sanitize_memory(void *s, int c, size_t n)
return __memset(s, c, n);
}
extern bool kmsan_enabled;
extern int panic_on_kmsan;
/*
* KMSAN performs a lot of consistency checks that are currently enabled by
* default. BUG_ON is normally discouraged in the kernel, unless used for
* debugging, but KMSAN itself is a debugging tool, so it makes little sense to
* recover if something goes wrong.
*/
#define KMSAN_WARN_ON(cond) \
({ \
const bool __cond = WARN_ON(cond); \
if (unlikely(__cond)) { \
WRITE_ONCE(kmsan_enabled, false); \
if (panic_on_kmsan) { \
/* Can't call panic() here because */ \
/* of uaccess checks. */ \
BUG(); \
} \
} \
__cond; \
})
#else
static inline void kmsan_init_shadow(void)
@@ -380,6 +403,8 @@ static inline void *memset_no_sanitize_memory(void *s, int c, size_t n)
return memset(s, c, n);
}
#define KMSAN_WARN_ON WARN_ON
#endif
#endif /* _LINUX_KMSAN_H */