fuzz-main: allow the number of runs to be overridden

This is useful when debugging.

1 files changed, 14 insertions, 3 deletions

diff --git a/src/fuzz/fuzz-main.c b/src/fuzz/fuzz-main.c
index c39db5d59d..cf70424c16 100644
--- a/src/fuzz/fuzz-main.c
+++ b/src/fuzz/fuzz-main.c
@@ -1,9 +1,11 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include "alloc-util.h"
-#include "log.h"
 #include "fileio.h"
 #include "fuzz.h"
+#include "log.h"
+#include "parse-util.h"
+#include "string-util.h"
 #include "tests.h"
 
 /* This is a test driver for the systemd fuzzers that provides main function
@@ -15,13 +17,22 @@
 /* This one was borrowed from
  * https://github.com/google/oss-fuzz/blob/646fca1b506b056db3a60d32c4a1a7398f171c94/infra/base-images/base-runner/bad_build_check#L19
  */
-#define MIN_NUMBER_OF_RUNS 4
+#define NUMBER_OF_RUNS 4
 
 int main(int argc, char **argv) {
         int r;
 
         test_setup_logging(LOG_DEBUG);
 
+        unsigned number_of_runs = NUMBER_OF_RUNS;
+
+        const char *v = getenv("SYSTEMD_FUZZ_RUNS");
+        if (!isempty(v)) {
+                r = safe_atou(v, &number_of_runs);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to parse SYSTEMD_FUZZ_RUNS=%s: %m", v);
+        }
+
         for (int i = 1; i < argc; i++) {
                 _cleanup_free_ char *buf = NULL;
                 size_t size;
@@ -35,7 +46,7 @@ int main(int argc, char **argv) {
                 }
                 printf("%s... ", name);
                 fflush(stdout);
-                for (int j = 0; j < MIN_NUMBER_OF_RUNS; j++)
+                for (unsigned j = 0; j < number_of_runs; j++)
                         if (LLVMFuzzerTestOneInput((uint8_t*)buf, size) == EXIT_TEST_SKIP)
                                 return EXIT_TEST_SKIP;
                 printf("ok\n");