diff options
Diffstat (limited to 'tests/ossfuzz/fuzz_encode_stream.c')
| -rw-r--r-- | tests/ossfuzz/fuzz_encode_stream.c | 38 |
1 files changed, 23 insertions, 15 deletions
diff --git a/tests/ossfuzz/fuzz_encode_stream.c b/tests/ossfuzz/fuzz_encode_stream.c index 8ae8780e..f5770baa 100644 --- a/tests/ossfuzz/fuzz_encode_stream.c +++ b/tests/ossfuzz/fuzz_encode_stream.c @@ -1,11 +1,10 @@ /////////////////////////////////////////////////////////////////////////////// // /// \file fuzz_encode_stream.c -/// \brief Fuzz test program for liblzma lzma_stream_encoder() w/ LZMA2 +/// \brief Fuzz test program for .xz encoding // -// Author: Maksym Vatsyk -// -// Based on Lasse Collin's original fuzzer for liblzma +// Authors: Maksym Vatsyk +// Lasse Collin // // This file has been put into the public domain. // You can do whatever you want with this file. @@ -27,9 +26,15 @@ LLVMFuzzerTestOneInput(const uint8_t *inbuf, size_t inbuf_size) return 0; } - // set LZMA preset level based on the first input byte + // Set the LZMA options based on the first input byte. The fuzzer + // will learn through its mutational genetic algorithm with the + // code coverage feedback that the first byte must be one of the + // values with a switch case label. This allows us to have one fuzz + // target cover many critical code paths so the fuzz resources can + // be used efficiently. uint32_t preset_level; - uint8_t decider = inbuf[0]; + const uint8_t decider = inbuf[0]; + switch (decider) { case 0: case 1: @@ -53,21 +58,24 @@ LLVMFuzzerTestOneInput(const uint8_t *inbuf, size_t inbuf_size) abort(); } - // Initialize filter chain for lzma_stream_decoder() call - // Use single LZMA2 filter for encoding - lzma_filter filters[2]; - filters[0].id = LZMA_FILTER_LZMA2; - filters[0].options = &opt_lzma; - filters[1].id = LZMA_VLI_UNKNOWN; + // Set the filter chain as only LZMA2. + lzma_filter filters[2] = { + { + .id = LZMA_FILTER_LZMA2, + .options = &opt_lzma, + }, { + .id = LZMA_VLI_UNKNOWN, + } + }; // initialize empty LZMA stream lzma_stream strm = LZMA_STREAM_INIT; // Initialize the stream encoder using the above // stream, filter chain and CRC64. - if (lzma_stream_encoder(&strm, - filters, LZMA_CHECK_CRC64) != LZMA_OK) { - fprintf(stderr, "lzma_stream_encoder() failed\n"); + lzma_ret ret = lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC64); + if (ret != LZMA_OK) { + fprintf(stderr, "lzma_stream_encoder() failed (%d)\n", ret); abort(); } |