fuzz: add fuzz_lzxpress_huffman_round_trip

This compresses some data, decompresses it, and asserts that the
result is identical to the original string.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>

diff --git a/lib/fuzzing/fuzz_lzxpress_huffman_round_trip.c b/lib/fuzzing/fuzz_lzxpress_huffman_round_trip.c
new file mode 100644 (file)
index 0000000..b59be43
--- /dev/null
+++ b/lib/fuzzing/fuzz_lzxpress_huffman_round_trip.c
@@ -0,0 +1,68 @@
+/*
+   Fuzzing for lzxpress_huffman{_decompress,_compress} round trip
+   Copyright (C) Michael Hanselmann 2019
+   Copyright (C) Douglas Bagnall 2022 <dbagnall@samba.org>
+
+   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 "compression/lzxpress_huffman.h"
+
+
+int LLVMFuzzerInitialize(int *argc, char ***argv)
+{
+       return 0;
+}
+
+
+int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len)
+{
+        /*
+        * we allow compressed to be 25% bigger than decompressed.
+        */
+       static uint8_t compressed[1024 * (1024 + 256)];
+       static uint8_t decompressed[1024 * 1024];
+       ssize_t compressed_size;
+       ssize_t decompressed_size;
+       struct lzxhuff_compressor_mem cmp;
+
+       if (len > sizeof(decompressed) || len == 0) {
+               return 0;
+       }
+
+       compressed_size = lzxpress_huffman_compress(&cmp,
+                                                   buf,
+                                                   len,
+                                                   compressed,
+                                                   sizeof(compressed));
+       if (compressed_size < 0) {
+               abort();
+       }
+
+       decompressed_size = lzxpress_huffman_decompress(compressed,
+                                                       compressed_size,
+                                                       decompressed,
+                                                       len);
+
+       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 fe64cec6c4ebbf2396e7f942350a43ba7886d371..ee3cfc1431736c02938facac1426e0279cba084b 100644 (file)
--- a/lib/fuzzing/wscript_build
+++ b/lib/fuzzing/wscript_build
@@ -67,6 +67,11 @@ bld.SAMBA_BINARY('fuzz_lzxpress_huffman_compress',
                  deps='fuzzing LZXPRESS afl-fuzz-main',
                  fuzzer=True)
 
+bld.SAMBA_BINARY('fuzz_lzxpress_huffman_round_trip',
+                 source='fuzz_lzxpress_huffman_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',