fuzz: add lzxpress compress/decompress round-trip

We say it is an error to end up at a different result.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

2 files changed, 58 insertions, 0 deletions

diff --git a/lib/fuzzing/fuzz_lzxpress_round_trip.c b/lib/fuzzing/fuzz_lzxpress_round_trip.c
new file mode 100644
index 00000000000..a6173bb68c9
--- /dev/null
+++ b/lib/fuzzing/fuzz_lzxpress_round_trip.c
@@ -0,0 +1,53 @@
+/*
+   Fuzzing for lzxpress_decompress
+   Copyright (C) Michael Hanselmann 2019
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "fuzzing/fuzzing.h"
+#include "lzxpress.h"
+
+int LLVMFuzzerInitialize(int *argc, char ***argv)
+{
+	return 0;
+}
+
+int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len)
+{
+	static uint8_t compressed[1024 * 1024] = {0};
+	static uint8_t decompressed[1024 * 1024] = {0};
+	ssize_t compressed_size;
+	ssize_t decompressed_size;
+
+	if (len > sizeof(decompressed)) {
+		return 0;
+	}
+
+	compressed_size = lzxpress_compress(buf, len,
+					    compressed, sizeof(compressed));
+
+	decompressed_size = lzxpress_decompress(compressed, compressed_size,
+						decompressed, sizeof(decompressed));
+
+	if (decompressed_size != len) {
+		abort();
+	}
+	if (memcmp(buf, decompressed, len) != 0) {
+		abort();
+	}
+
+	return 0;
+}
diff --git a/lib/fuzzing/wscript_build b/lib/fuzzing/wscript_build
index f9e2a9ab8b3..9c559b3bcc8 100644
--- a/lib/fuzzing/wscript_build
+++ b/lib/fuzzing/wscript_build
@@ -52,6 +52,11 @@ bld.SAMBA_BINARY('fuzz_lzxpress_compress',
                  deps='fuzzing LZXPRESS afl-fuzz-main',
                  fuzzer=True)
 
+bld.SAMBA_BINARY('fuzz_lzxpress_round_trip',
+                 source='fuzz_lzxpress_round_trip.c',
+                 deps='fuzzing LZXPRESS afl-fuzz-main',
+                 fuzzer=True)
+
 bld.SAMBA_BINARY('fuzz_ldap_decode',
                  source='fuzz_ldap_decode.c',
                  deps='fuzzing cli-ldap afl-fuzz-main',