Fuzzing getdiskcookedname in libutil

tests/fuzz/libutil/getdiskcookedname/Makefile

@@ -0,0 +1,17 @@
+#       $NetBSD: Makefile,v 1.15 2007/05/28 12:06:25 tls Exp $
+#       @(#)Makefile    8.2 (Berkeley) 4/2/94
+
+.include <bsd.own.mk>
+
+PROG=   fuzz_getdiskcookedname
+SRCS=   fuzz_getdiskcookedname.c
+.PATH:  ${NETBSDSRCDIR}/lib/libutil
+SRCS+=	getdiskrawname.c
+
+CFLAGS= -fsanitize=fuzzer-no-link,address,undefined -Wall -Werror
+LDFLAGS= -fsanitize=fuzzer,address,undefined -Wall -Werror
+
+fuzz: fuzz_getdiskcookedname
+	export UBSAN_OPTIONS=halt_on_error=1 && ./fuzz_getdiskcookedname -only_ascii ./input > /dev/null
+
+.include <bsd.prog.mk>

tests/fuzz/libutil/getdiskcookedname/fuzz_getdiskcookedname.c

@@ -0,0 +1,21 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern const char *
+getdiskcookedname(char *buf, size_t bufsiz, const char *name);
+
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+#define N 4096
+    char buf[N];
+
+    char *name = (char *)malloc(size + 1);
+    memcpy(name, data, size);
+    name[size] = '\0';
+    getdiskcookedname(buf, N, name);
+    free(name);
+
+    return 0;
+}