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-rw-r--r--src/fuzz/fuzz-compress.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/src/fuzz/fuzz-compress.c b/src/fuzz/fuzz-compress.c
new file mode 100644
index 0000000..10956cc
--- /dev/null
+++ b/src/fuzz/fuzz-compress.c
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+
+#include "alloc-util.h"
+#include "compress.h"
+#include "fuzz.h"
+
+typedef struct header {
+ uint32_t alg:2; /* We have only three compression algorithms so far, but we might add more in the
+ * future. Let's make this a bit wider so our fuzzer cases remain stable in the
+ * future. */
+ uint32_t sw_len;
+ uint32_t sw_alloc;
+ uint32_t reserved[3]; /* Extra space to keep fuzz cases stable in case we need to
+ * add stuff in the future. */
+ uint8_t data[];
+} header;
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+ _cleanup_free_ void *buf = NULL, *buf2 = NULL;
+ int r;
+
+ if (size < offsetof(header, data) + 1)
+ return 0;
+
+ const header *h = (struct header*) data;
+ const size_t data_len = size - offsetof(header, data);
+
+ int alg = h->alg;
+
+ /* 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);
+
+ log_info("Using compression %s, data size=%zu",
+ compression_to_string(alg),
+ data_len);
+
+ buf = malloc(MAX(size, 128u)); /* Make the buffer a bit larger for very small data */
+ if (!buf) {
+ log_oom();
+ return 0;
+ }
+
+ size_t csize;
+ r = compress_blob_explicit(alg, h->data, data_len, buf, size, &csize);
+ if (r < 0) {
+ log_error_errno(r, "Compression failed: %m");
+ return 0;
+ }
+
+ log_debug("Compressed %zu bytes to → %zu bytes", data_len, csize);
+
+ size_t sw_alloc = MAX(h->sw_alloc, 1u);
+ buf2 = malloc(sw_alloc);
+ if (!buf2) {
+ log_oom();
+ return 0;
+ }
+
+ size_t sw_len = MIN(data_len - 1, h->sw_len);
+
+ r = decompress_startswith(alg, buf, csize, &buf2, h->data, sw_len, h->data[sw_len]);
+ assert_se(r > 0);
+
+ return 0;
+}