With Clang version 16+, -fsanitize=thread will turn memcpy/memset/memmove calls in instrumented functions into __tsan_memcpy/__tsan_memset/__tsan_memmove calls respectively. Add these functions to the core KCSAN runtime, so that we (a) catch data races with mem* functions, and (b) won't run into linker errors with such newer compilers. Cc: stable@xxxxxxxxxxxxxxx # v5.10+ Signed-off-by: Marco Elver <elver@xxxxxxxxxx> --- kernel/kcsan/core.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index fe12dfe254ec..66ef48aa86e0 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -18,6 +18,7 @@ #include <linux/percpu.h> #include <linux/preempt.h> #include <linux/sched.h> +#include <linux/string.h> #include <linux/uaccess.h> #include "encoding.h" @@ -1308,3 +1309,29 @@ noinline void __tsan_atomic_signal_fence(int memorder) } } EXPORT_SYMBOL(__tsan_atomic_signal_fence); + +void *__tsan_memset(void *s, int c, size_t count); +noinline void *__tsan_memset(void *s, int c, size_t count) +{ + check_access(s, count, KCSAN_ACCESS_WRITE, _RET_IP_); + return __memset(s, c, count); +} +EXPORT_SYMBOL(__tsan_memset); + +void *__tsan_memmove(void *dst, const void *src, size_t len); +noinline void *__tsan_memmove(void *dst, const void *src, size_t len) +{ + check_access(dst, len, KCSAN_ACCESS_WRITE, _RET_IP_); + check_access(src, len, 0, _RET_IP_); + return __memmove(dst, src, len); +} +EXPORT_SYMBOL(__tsan_memmove); + +void *__tsan_memcpy(void *dst, const void *src, size_t len); +noinline void *__tsan_memcpy(void *dst, const void *src, size_t len) +{ + check_access(dst, len, KCSAN_ACCESS_WRITE, _RET_IP_); + check_access(src, len, 0, _RET_IP_); + return __memcpy(dst, src, len); +} +EXPORT_SYMBOL(__tsan_memcpy); -- 2.37.2.789.g6183377224-goog