From 7313047fd119156888aa02a996027e884231d763 Mon Sep 17 00:00:00 2001
From: Toby Jaffey <toby@ringtailsoftware.co.uk>
Date: Sun, 14 Dec 2025 12:34:53 +0000
Subject: [PATCH] Simple fuzzer

---
 hosts/fuzz/Makefile |  9 +++++++++
 hosts/fuzz/fuzz.c   | 23 +++++++++++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 hosts/fuzz/Makefile
 create mode 100644 hosts/fuzz/fuzz.c

diff --git a/hosts/fuzz/Makefile b/hosts/fuzz/Makefile
new file mode 100644
index 0000000..92e0b93
--- /dev/null
+++ b/hosts/fuzz/Makefile
@@ -0,0 +1,9 @@
+TOPDIR=../..
+all:
+	afl-clang-fast -g3 -fsanitize=address,undefined -Wall -DUVM32_MEMORY_SIZE=8388608 -I${TOPDIR}/uvm32 -I${TOPDIR}/common -o host-fuzz ${TOPDIR}/uvm32/uvm32.c fuzz.c
+	afl-fuzz -i${TOPDIR}/precompiled -oo ./host-fuzz
+
+clean:
+	rm -rf host-fuzz o host-fuzz.dSYM
+
+
diff --git a/hosts/fuzz/fuzz.c b/hosts/fuzz/fuzz.c
new file mode 100644
index 0000000..9d2cb94
--- /dev/null
+++ b/hosts/fuzz/fuzz.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "uvm32.h"
+#include "../common/uvm32_common_custom.h"
+
+__AFL_FUZZ_INIT();
+
+int main(int argc, char *argv[]) {
+    __AFL_INIT();
+    uvm32_state_t vmst;
+    uvm32_evt_t evt;
+
+    uvm32_init(&vmst);
+    unsigned char *rom = __AFL_FUZZ_TESTCASE_BUF;
+    while (__AFL_LOOP(10000)) {
+        uvm32_load(&vmst, rom, __AFL_FUZZ_TESTCASE_LEN);
+        uvm32_run(&vmst, &evt, 1000);
+    }
+
+    return 0;
+}