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-rw-r--r--src/libsystemd/sd-bus/fuzz-bus-match.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/fuzz-bus-match.c b/src/libsystemd/sd-bus/fuzz-bus-match.c
new file mode 100644
index 0000000..f74394b
--- /dev/null
+++ b/src/libsystemd/sd-bus/fuzz-bus-match.c
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "bus-internal.h"
+#include "bus-match.h"
+#include "env-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fuzz.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+ _cleanup_free_ char *out = NULL; /* out should be freed after g */
+ size_t out_size;
+ _cleanup_fclose_ FILE *g = NULL;
+ _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
+ int r;
+
+ if (outside_size_range(size, 0, 65536))
+ return 0;
+
+ /* 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);
+
+ r = sd_bus_new(&bus);
+ assert_se(r >= 0);
+
+ struct bus_match_node root = {
+ .type = BUS_MATCH_ROOT,
+ };
+
+ /* Note that we use the pointer to match_callback substructure, but the code
+ * uses container_of() to access outside of the passed-in type. */
+ sd_bus_slot slot = {
+ .type = BUS_MATCH_CALLBACK,
+ .match_callback = {},
+ };
+
+ if (getenv_bool("SYSTEMD_FUZZ_OUTPUT") <= 0)
+ assert_se(g = open_memstream_unlocked(&out, &out_size));
+
+ for (size_t offset = 0; offset < size; ) {
+ _cleanup_free_ char *line = NULL;
+ char *end;
+
+ end = memchr((char*) data + offset, '\n', size - offset);
+
+ line = memdup_suffix0((char*) data + offset,
+ end ? end - (char*) data - offset : size - offset);
+ if (!line)
+ return log_oom_debug();
+
+ offset = end ? (size_t) (end - (char*) data + 1) : size;
+
+ struct bus_match_component *components;
+ unsigned n_components;
+ r = bus_match_parse(line, &components, &n_components);
+ if (IN_SET(r, -EINVAL, -ENOMEM)) {
+ log_debug_errno(r, "Failed to parse line: %m");
+ continue;
+ }
+ assert_se(r >= 0); /* We only expect EINVAL and ENOMEM errors, or success. */
+
+ log_debug("Parsed %u components.", n_components);
+
+ _cleanup_free_ char *again = bus_match_to_string(components, n_components);
+ if (!again) {
+ bus_match_parse_free(components, n_components);
+ log_oom();
+ break;
+ }
+
+ if (g)
+ fprintf(g, "%s\n", again);
+
+ r = bus_match_add(&root, components, n_components, &slot.match_callback);
+ bus_match_parse_free(components, n_components);
+ if (r < 0) {
+ log_error_errno(r, "Failed to add match: %m");
+ break;
+ }
+ }
+
+ bus_match_dump(g ?: stdout, &root, 0); /* We do this even on failure, to check consistency after error. */
+ bus_match_free(&root);
+
+ return 0;
+}