diff options
Diffstat (limited to 'libpng/contrib/oss-fuzz/newcc')
| -rw-r--r-- | libpng/contrib/oss-fuzz/newcc | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/libpng/contrib/oss-fuzz/newcc b/libpng/contrib/oss-fuzz/newcc new file mode 100644 index 000000000..0fc9e206c --- /dev/null +++ b/libpng/contrib/oss-fuzz/newcc @@ -0,0 +1,190 @@ + +// libpng_read_fuzzer.cc +// Copyright 2017 Glenn Randers-Pehrson +// Copyright 2015 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that may +// be found in the LICENSE file https://cs.chromium.org/chromium/src/LICENSE + +// Last changed in libpng 1.6.33beta03 [September 27, 2017] + +// The modifications in 2017 by Glenn Randers-Pehrson include +// 1. addition of a PNG_CLEANUP macro, +// 2. setting the option to ignore ADLER32 checksums, +// 3. adding "#include <string.h>" which is needed on some platforms +// to provide memcpy(). +// 4. adding read_end_info() and creating an end_info structure. + +#include <stddef.h> +#include <stdint.h> +#include <string.h> + +#include <vector> + +#define PNG_INTERNAL +#include "png.h" + +struct BufState { + const uint8_t* data; + size_t bytes_left; +}; + +struct PngObjectHandler { + png_infop info_ptr = nullptr; + png_structp png_ptr = nullptr; + png_infop end_info_ptr = nullptr; + png_voidp row_ptr = nullptr; + BufState* buf_state = nullptr; + + ~PngObjectHandler() { + if (row_ptr) + png_free(png_ptr, row_ptr); + if (end_info_ptr) + png_destroy_read_struct(&png_ptr, &info_ptr, &end_info_ptr); + else if (info_ptr) + png_destroy_read_struct(&png_ptr, &info_ptr, nullptr); + else + png_destroy_read_struct(&png_ptr, nullptr, nullptr); + delete buf_state; + } +}; + +void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { + BufState* buf_state = static_cast<BufState*>(png_get_io_ptr(png_ptr)); + if (length > buf_state->bytes_left) { + png_error(png_ptr, "read error"); + } + memcpy(data, buf_state->data, length); + buf_state->bytes_left -= length; + buf_state->data += length; +} + +static const int kPngHeaderSize = 8; + +// Entry point for LibFuzzer. +// Roughly follows the libpng book example: +// http://www.libpng.org/pub/png/book/chapter13.html + +extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { + if (size < kPngHeaderSize) { + return 0; + } + + std::vector<unsigned char> v(data, data + size); + if (png_sig_cmp(v.data(), 0, kPngHeaderSize)) { + // not a PNG. + return 0; + } + + PngObjectHandler png_handler; + png_handler.png_ptr = nullptr; + png_handler.row_ptr = nullptr; + png_handler.info_ptr = nullptr; + png_handler.end_info_ptr = nullptr; + + png_handler.png_ptr = png_create_read_struct + (PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr); + if (!png_handler.png_ptr) { + return 0; + } + +#define PNG_CLEANUP \ + if(png_handler.png_ptr) \ + { \ + if (png_handler.row_ptr) \ + png_free(png_handler.png_ptr, png_handler.row_ptr); \ + if (png_handler.end_info_ptr) \ + png_destroy_read_struct(&png_handler.png_ptr, &png_handler.info_ptr,\ + &png_handler.end_info_ptr); \ + else if (png_handler.info_ptr) \ + png_destroy_read_struct(&png_handler.png_ptr, &png_handler.info_ptr,\ + nullptr); \ + else \ + png_destroy_read_struct(&png_handler.png_ptr, nullptr, nullptr); \ + png_handler.png_ptr = nullptr; \ + png_handler.row_ptr = nullptr; \ + png_handler.info_ptr = nullptr; \ + png_handler.end_info_ptr = nullptr; \ + } + + png_handler.info_ptr = png_create_info_struct(png_handler.png_ptr); + if (!png_handler.info_ptr) { + PNG_CLEANUP + return 0; + } + + png_handler.end_info_ptr = png_create_info_struct(png_handler.png_ptr); + if (!png_handler.end_info_ptr) { + PNG_CLEANUP + return 0; + } + + /* Treat benign errors as warnings */ + png_set_benign_errors(png_handler.png_ptr, 1); + + png_set_crc_action(png_handler.png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE); + +#ifdef PNG_IGNORE_ADLER32 + png_set_option(png_handler.png_ptr, PNG_IGNORE_ADLER32, PNG_OPTION_ON); +#endif + + // Setting up reading from buffer. + png_handler.buf_state = new BufState(); + png_handler.buf_state->data = data + kPngHeaderSize; + png_handler.buf_state->bytes_left = size - kPngHeaderSize; + png_set_read_fn(png_handler.png_ptr, png_handler.buf_state, user_read_data); + png_set_sig_bytes(png_handler.png_ptr, kPngHeaderSize); + + if (setjmp(png_jmpbuf(png_handler.png_ptr))) { + PNG_CLEANUP + return 0; + } + + // Reading. + png_read_info(png_handler.png_ptr, png_handler.info_ptr); + png_read_update_info(png_handler.png_ptr, png_handler.info_ptr); + png_handler.row_ptr = png_malloc( + png_handler.png_ptr, png_get_rowbytes(png_handler.png_ptr, + png_handler.info_ptr)); + + // reset error handler to put png_deleter into scope. + if (setjmp(png_jmpbuf(png_handler.png_ptr))) { + PNG_CLEANUP + return 0; + } + + png_uint_32 width, height; + int bit_depth, color_type, interlace_type, compression_type; + int filter_type; + + if (!png_get_IHDR(png_handler.png_ptr, png_handler.info_ptr, &width, + &height, &bit_depth, &color_type, &interlace_type, + &compression_type, &filter_type)) { + PNG_CLEANUP + return 0; + } + + // This is going to be too slow. + if (width && height > 100000000 / width) { + PNG_CLEANUP + return 0; + } + + int passes = png_set_interlace_handling(png_handler.png_ptr); + png_start_read_image(png_handler.png_ptr); + + /* To do: prevent the optimizer from removing this code entirely */ + for (int pass = 0; pass < passes; ++pass) { + for (png_uint_32 y = 0; y < height; ++y) { + png_read_row(png_handler.png_ptr, + static_cast<png_bytep>(png_handler.row_ptr), nullptr); + } + } + + png_read_end(png_handler.png_ptr, png_handler.end_info_ptr); + + PNG_CLEANUP + + /* TO do: exercise the progressive reader here */ + + return 0; +} |