fuzz: add env-file fuzzer

2 files changed, 35 insertions, 0 deletions

diff --git a/src/fuzz/fuzz-env-file.c b/src/fuzz/fuzz-env-file.c
new file mode 100644
index 0000000000..51df1aab55
--- /dev/null
+++ b/src/fuzz/fuzz-env-file.c
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+
+#include "alloc-util.h"
+#include "env-file.h"
+#include "fd-util.h"
+#include "fuzz.h"
+#include "strv.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_strv_free_ char **rl = NULL, **rlp =  NULL;
+
+        if (size == 0)
+                return 0;
+
+        f = fmemopen((char*) data, size, "re");
+        assert_se(f);
+
+        /* We don't want to fill the logs with messages about parse errors.
+         * Disable most logging if not running standalone */
+        if (!getenv("SYSTEMD_LOG_LEVEL"))
+                log_set_max_level(LOG_CRIT);
+
+        (void) load_env_file(f, NULL, &rl);
+        assert_se(fseek(f, 0, SEEK_SET) == 0);
+        (void) load_env_file_pairs(f, NULL, &rlp);
+
+        return 0;
+}
diff --git a/src/fuzz/meson.build b/src/fuzz/meson.build
index ba893cff94..d09006f640 100644
--- a/src/fuzz/meson.build
+++ b/src/fuzz/meson.build
@@ -116,4 +116,8 @@ fuzzers += [
         [['src/fuzz/fuzz-bus-label.c'],
          [libshared],
          []],
+
+        [['src/fuzz/fuzz-env-file.c'],
+         [libshared],
+         []],
 ]