2017-08-21 20:14:39 -04:00
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// libpng_read_fuzzer.cc
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// Copyright 2017 Glenn Randers-Pehrson
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// Copyright 2015 The Chromium Authors. All rights reserved.
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2017-08-21 21:34:26 -04:00
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// Use of this source code is governed by a BSD-style license that may
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// be found in the LICENSE file https://cs.chromium.org/chromium/src/LICENSE
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2017-08-21 20:14:39 -04:00
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2017-08-25 19:52:39 -04:00
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// Last changed in libpng 1.6.32 [(PENDING RELEASE)]
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2017-08-21 20:14:39 -04:00
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2017-08-22 14:58:59 -04:00
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// The modifications in 2017 by Glenn Randers-Pehrson include
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// 1. addition of a PNG_CLEANUP macro,
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// 2. setting the option to ignore ADLER32 checksums,
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2017-08-22 21:04:35 -04:00
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// 3. adding "#include <string.h>" which is needed on some platforms
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// to provide memcpy().
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2017-08-21 20:14:39 -04:00
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <vector>
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#define PNG_INTERNAL
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#include "png.h"
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#define PNG_CLEANUP \
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if(png_handler.png_ptr) \
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{ \
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if (png_handler.info_ptr) \
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png_destroy_read_struct(&png_handler.png_ptr, &png_handler.info_ptr,\
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nullptr); \
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else \
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png_destroy_read_struct(&png_handler.png_ptr, nullptr, nullptr); \
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}
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struct BufState {
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const uint8_t* data;
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size_t bytes_left;
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};
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struct PngObjectHandler {
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png_infop info_ptr = nullptr;
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png_structp png_ptr = nullptr;
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png_voidp row_ptr = nullptr;
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BufState* buf_state = nullptr;
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~PngObjectHandler() {
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if (row_ptr && png_ptr) {
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png_free(png_ptr, row_ptr);
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}
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if (png_ptr && info_ptr) {
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png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
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}
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delete buf_state;
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}
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};
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void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length) {
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BufState* buf_state = static_cast<BufState*>(png_get_io_ptr(png_ptr));
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if (length > buf_state->bytes_left) {
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png_error(png_ptr, "read error");
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}
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memcpy(data, buf_state->data, length);
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buf_state->bytes_left -= length;
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buf_state->data += length;
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}
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static const int kPngHeaderSize = 8;
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// Entry point for LibFuzzer.
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// Roughly follows the libpng book example:
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// http://www.libpng.org/pub/png/book/chapter13.html
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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if (size < kPngHeaderSize) {
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return 0;
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}
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std::vector<unsigned char> v(data, data + size);
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if (png_sig_cmp(v.data(), 0, kPngHeaderSize)) {
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// not a PNG.
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return 0;
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}
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PngObjectHandler png_handler;
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png_handler.png_ptr = png_create_read_struct
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(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
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if (!png_handler.png_ptr) {
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return 0;
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}
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png_handler.info_ptr = png_create_info_struct(png_handler.png_ptr);
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if (!png_handler.info_ptr) {
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PNG_CLEANUP
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return 0;
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}
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png_set_crc_action(png_handler.png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
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#ifdef PNG_IGNORE_ADLER32
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2017-08-21 21:19:43 -04:00
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png_set_option(png_handler.png_ptr, PNG_IGNORE_ADLER32, PNG_OPTION_ON);
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2017-08-21 20:14:39 -04:00
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#endif
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// Setting up reading from buffer.
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png_handler.buf_state = new BufState();
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png_handler.buf_state->data = data + kPngHeaderSize;
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png_handler.buf_state->bytes_left = size - kPngHeaderSize;
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png_set_read_fn(png_handler.png_ptr, png_handler.buf_state, user_read_data);
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png_set_sig_bytes(png_handler.png_ptr, kPngHeaderSize);
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if (setjmp(png_jmpbuf(png_handler.png_ptr))) {
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PNG_CLEANUP
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return 0;
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}
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// Reading.
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png_read_info(png_handler.png_ptr, png_handler.info_ptr);
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png_handler.row_ptr = png_malloc(
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png_handler.png_ptr, png_get_rowbytes(png_handler.png_ptr,
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png_handler.info_ptr));
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// reset error handler to put png_deleter into scope.
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if (setjmp(png_jmpbuf(png_handler.png_ptr))) {
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PNG_CLEANUP
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return 0;
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}
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png_uint_32 width, height;
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int bit_depth, color_type, interlace_type, compression_type;
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int filter_type;
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if (!png_get_IHDR(png_handler.png_ptr, png_handler.info_ptr, &width,
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&height, &bit_depth, &color_type, &interlace_type,
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&compression_type, &filter_type)) {
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PNG_CLEANUP
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return 0;
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}
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// This is going to be too slow.
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if (width && height > 100000000 / width) {
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PNG_CLEANUP
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return 0;
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}
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int passes = png_set_interlace_handling(png_handler.png_ptr);
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png_start_read_image(png_handler.png_ptr);
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for (int pass = 0; pass < passes; ++pass) {
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for (png_uint_32 y = 0; y < height; ++y) {
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png_read_row(png_handler.png_ptr,
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static_cast<png_bytep>(png_handler.row_ptr), nullptr);
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}
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}
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PNG_CLEANUP
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return 0;
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}
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