bfe69aea09
* format all (clang format 13) * added clang-format check * re-add missing newline * cargo doc was missing * more brackets * fixed fmt workflow * clang format * shellcheck * install clang-format-13 * update ubuntu for maximum clang-formattability * yml whitespaces * fmt * shellcheck only for .sh * oops path * ignored shellcheck warning
236 lines
7.2 KiB
C++
236 lines
7.2 KiB
C++
// libpng_read_fuzzer.cc
|
|
// Copyright 2017-2018 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 1.6.35 [July 15, 2018]
|
|
|
|
// 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.
|
|
// 5. adding calls to png_set_*() transforms commonly used by browsers.
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
#include <vector>
|
|
|
|
#define PNG_INTERNAL
|
|
#include "png.h"
|
|
|
|
#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; \
|
|
}
|
|
|
|
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, 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;
|
|
|
|
extern "C" int afl_libfuzzer_init() {
|
|
return 0;
|
|
}
|
|
|
|
static char *allocation = NULL;
|
|
|
|
__attribute__((noinline)) void func3(char *alloc) {
|
|
// printf("func3\n");
|
|
#ifdef _WIN32
|
|
if (rand() == 0) {
|
|
alloc[0x1ff] = 0xde;
|
|
printf("alloc[0x200]: %d\n", alloc[0x200]);
|
|
}
|
|
#else
|
|
if (random() == 0) {
|
|
alloc[0x1ff] = 0xde;
|
|
printf("alloc[0x200]: %d\n", alloc[0x200]);
|
|
}
|
|
#endif
|
|
}
|
|
__attribute__((noinline)) void func2() {
|
|
allocation = (char *)malloc(0xff);
|
|
// printf("func2\n");
|
|
func3(allocation);
|
|
}
|
|
__attribute__((noinline)) void func1() {
|
|
// printf("func1\n");
|
|
func2();
|
|
}
|
|
|
|
// Export this symbol
|
|
#ifdef _WIN32
|
|
#define HARNESS_EXPORTS __declspec(dllexport)
|
|
#else
|
|
#define HARNESS_EXPORTS
|
|
#endif
|
|
|
|
// Entry point for LibFuzzer.
|
|
// Roughly follows the libpng book example:
|
|
// http://www.libpng.org/pub/png/book/chapter13.html
|
|
HARNESS_EXPORTS extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data,
|
|
size_t size) {
|
|
if (size >= 8 && *(uint64_t *)data == 0xABCDEFAA8F1324AA) { abort(); }
|
|
if (size < kPngHeaderSize) { return 0; }
|
|
|
|
#ifdef TEST_ASAN
|
|
func1();
|
|
#endif
|
|
|
|
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; }
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
|
|
// 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
|
|
#ifdef HAS_DUMMY_CRASH
|
|
#ifdef __aarch64__
|
|
asm volatile(".word 0xf7f0a000\n");
|
|
#else
|
|
asm("ud2");
|
|
#endif
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
// Set several transforms that browsers typically use:
|
|
png_set_gray_to_rgb(png_handler.png_ptr);
|
|
png_set_expand(png_handler.png_ptr);
|
|
png_set_packing(png_handler.png_ptr);
|
|
png_set_scale_16(png_handler.png_ptr);
|
|
png_set_tRNS_to_alpha(png_handler.png_ptr);
|
|
|
|
int passes = png_set_interlace_handling(png_handler.png_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));
|
|
|
|
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
|
|
return 0;
|
|
}
|