tests: add a fuzzer for catalog_import_file

src/fuzz/fuzz-catalog.c

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "catalog.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "fuzz.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+        _cleanup_(unlink_tempfilep) char name[] = "/tmp/fuzz-catalog.XXXXXX";
+        _cleanup_close_ int fd = -1;
+        _cleanup_hashmap_free_free_free_ Hashmap *h = NULL;
+
+        if (!getenv("SYSTEMD_LOG_LEVEL"))
+                log_set_max_level(LOG_CRIT);
+
+        assert_se(h = hashmap_new(&catalog_hash_ops));
+
+        fd = mkostemp_safe(name);
+        assert_se(fd >= 0);
+        assert_se(write(fd, data, size) == (ssize_t) size);
+
+        (void) catalog_import_file(h, name);
+
+        return 0;
+}

src/fuzz/meson.build

@@ -5,6 +5,11 @@ fuzzers += [
          [libshared],
          []],
 
+        [['src/fuzz/fuzz-catalog.c'],
+         [libjournal_core,
+          libshared],
+         []],
+
         [['src/fuzz/fuzz-dns-packet.c',
           dns_type_headers],
          [libsystemd_resolve_core,