diff --git a/sys/libkern/strcmp.c b/sys/libkern/strcmp.c
--- a/sys/libkern/strcmp.c
+++ b/sys/libkern/strcmp.c
@@ -41,8 +41,12 @@
 int
 (strcmp)(const char *s1, const char *s2)
 {
+#if defined(KASAN) || defined(KCSAN)
+	return (SAN_INTERCEPTOR(strcmp)(s1, s2));
+#else
 	while (*s1 == *s2++)
 		if (*s1++ == '\0')
 			return (0);
 	return (*(const unsigned char *)s1 - *(const unsigned char *)(s2 - 1));
+#endif
 }
diff --git a/sys/libkern/strcpy.c b/sys/libkern/strcpy.c
--- a/sys/libkern/strcpy.c
+++ b/sys/libkern/strcpy.c
@@ -35,8 +35,12 @@
 char *
 (strcpy)(char * __restrict to, const char * __restrict from)
 {
+#if defined(KASAN) || defined(KCSAN)
+	return (SAN_INTERCEPTOR(strcpy)(to, from));
+#else
 	char *save = to;
 
 	for (; (*to = *from) != 0; ++from, ++to);
 	return(save);
+#endif
 }
diff --git a/sys/libkern/strlen.c b/sys/libkern/strlen.c
--- a/sys/libkern/strlen.c
+++ b/sys/libkern/strlen.c
@@ -29,6 +29,13 @@
 #include <sys/libkern.h>
 #include <sys/limits.h>
 
+#if defined(KASAN) || defined(KCSAN)
+size_t
+(strlen)(const char *str)
+{
+	return (SAN_INTERCEPTOR(strlen)(str));
+}
+#else /* !KASAN && !KCSAN */
 /*
  * Portable strlen() for 32-bit and 64-bit systems.
  *
@@ -119,3 +126,4 @@
 	/* NOTREACHED */
 	return (0);
 }
+#endif /* KASAN || KCSAN */