mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
245 lines
8.2 KiB
C
245 lines
8.2 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/* Targeted fuzzer that targets specific codecs depending on two
|
|
compile-time flags.
|
|
INSTRUCTIONS:
|
|
|
|
* Get the very fresh clang, e.g. see http://libfuzzer.info#versions
|
|
* Get and build libFuzzer:
|
|
svn co http://llvm.org/svn/llvm-project/llvm/trunk/lib/Fuzzer
|
|
./Fuzzer/build.sh
|
|
* build ffmpeg for fuzzing:
|
|
FLAGS="-fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp -g" CC="clang $FLAGS" CXX="clang++ $FLAGS" ./configure --disable-x86asm
|
|
make clean && make -j
|
|
* build the fuzz target.
|
|
Choose the value of FFMPEG_CODEC (e.g. AV_CODEC_ID_DVD_SUBTITLE) and
|
|
choose one of FUZZ_FFMPEG_VIDEO, FUZZ_FFMPEG_AUDIO, FUZZ_FFMPEG_SUBTITLE.
|
|
clang -fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp tools/target_dec_fuzzer.c -o target_dec_fuzzer -I. -DFFMPEG_CODEC=AV_CODEC_ID_MPEG1VIDEO -DFUZZ_FFMPEG_VIDEO ../../libfuzzer/libFuzzer.a -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,--as-needed -Wl,-z,noexecstack -Wl,--warn-common -Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -ldl -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb -lxcb-shape -lxcb -lX11 -lasound -lm -lbz2 -lz -pthread
|
|
* create a corpus directory and put some samples there (empty dir is ok too):
|
|
mkdir CORPUS && cp some-files CORPUS
|
|
|
|
* Run fuzzing:
|
|
./target_dec_fuzzer -max_len=100000 CORPUS
|
|
|
|
More info:
|
|
http://libfuzzer.info
|
|
http://tutorial.libfuzzer.info
|
|
https://github.com/google/oss-fuzz
|
|
http://lcamtuf.coredump.cx/afl/
|
|
https://security.googleblog.com/2016/08/guided-in-process-fuzzing-of-chrome.html
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
#include "libavcodec/avcodec.h"
|
|
#include "libavcodec/bytestream.h"
|
|
#include "libavformat/avformat.h"
|
|
|
|
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
|
|
|
|
static void error(const char *err)
|
|
{
|
|
fprintf(stderr, "%s", err);
|
|
exit(1);
|
|
}
|
|
|
|
static AVCodec *c = NULL;
|
|
static AVCodec *AVCodecInitialize(enum AVCodecID codec_id)
|
|
{
|
|
AVCodec *res;
|
|
|
|
res = avcodec_find_decoder(codec_id);
|
|
if (!res)
|
|
error("Failed to find decoder");
|
|
return res;
|
|
}
|
|
|
|
static int subtitle_handler(AVCodecContext *avctx, void *frame,
|
|
int *got_sub_ptr, AVPacket *avpkt)
|
|
{
|
|
AVSubtitle sub;
|
|
int ret = avcodec_decode_subtitle2(avctx, &sub, got_sub_ptr, avpkt);
|
|
if (ret >= 0 && *got_sub_ptr)
|
|
avsubtitle_free(&sub);
|
|
return ret;
|
|
}
|
|
|
|
// Class to handle buffer allocation and resize for each frame
|
|
typedef struct FuzzDataBuffer {
|
|
size_t size_;
|
|
uint8_t *data_;
|
|
} FuzzDataBuffer;
|
|
|
|
static void FDBCreate(FuzzDataBuffer *FDB) {
|
|
FDB->size_ = 0x1000;
|
|
FDB->data_ = av_malloc(FDB->size_);
|
|
if (!FDB->data_)
|
|
error("Failed memory allocation");
|
|
}
|
|
|
|
static void FDBDesroy(FuzzDataBuffer *FDB) { av_free(FDB->data_); }
|
|
|
|
static void FDBRealloc(FuzzDataBuffer *FDB, size_t size) {
|
|
size_t needed = size + AV_INPUT_BUFFER_PADDING_SIZE;
|
|
av_assert0(needed > size);
|
|
if (needed > FDB->size_) {
|
|
av_free(FDB->data_);
|
|
FDB->size_ = needed;
|
|
FDB->data_ = av_malloc(FDB->size_);
|
|
if (!FDB->data_)
|
|
error("Failed memory allocation");
|
|
}
|
|
}
|
|
|
|
static void FDBPrepare(FuzzDataBuffer *FDB, AVPacket *dst, const uint8_t *data,
|
|
size_t size)
|
|
{
|
|
FDBRealloc(FDB, size);
|
|
memcpy(FDB->data_, data, size);
|
|
size_t padd = FDB->size_ - size;
|
|
if (padd > AV_INPUT_BUFFER_PADDING_SIZE)
|
|
padd = AV_INPUT_BUFFER_PADDING_SIZE;
|
|
memset(FDB->data_ + size, 0, padd);
|
|
av_init_packet(dst);
|
|
dst->data = FDB->data_;
|
|
dst->size = size;
|
|
}
|
|
|
|
// Ensure we don't loop forever
|
|
const uint32_t maxiteration = 8096;
|
|
|
|
static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
|
|
|
|
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
|
|
const uint64_t fuzz_tag = FUZZ_TAG;
|
|
FuzzDataBuffer buffer;
|
|
const uint8_t *last = data;
|
|
const uint8_t *end = data + size;
|
|
uint32_t it = 0;
|
|
int (*decode_handler)(AVCodecContext *avctx, AVFrame *picture,
|
|
int *got_picture_ptr,
|
|
const AVPacket *avpkt) = NULL;
|
|
|
|
if (!c) {
|
|
#ifdef FFMPEG_DECODER
|
|
#define DECODER_SYMBOL0(CODEC) ff_##CODEC##_decoder
|
|
#define DECODER_SYMBOL(CODEC) DECODER_SYMBOL0(CODEC)
|
|
extern AVCodec DECODER_SYMBOL(FFMPEG_DECODER);
|
|
avcodec_register(&DECODER_SYMBOL(FFMPEG_DECODER));
|
|
|
|
c = &DECODER_SYMBOL(FFMPEG_DECODER);
|
|
#else
|
|
avcodec_register_all();
|
|
c = AVCodecInitialize(FFMPEG_CODEC); // Done once.
|
|
#endif
|
|
av_log_set_level(AV_LOG_PANIC);
|
|
}
|
|
|
|
// Unsupported
|
|
if (c->capabilities & AV_CODEC_CAP_HWACCEL_VDPAU)
|
|
return 0;
|
|
|
|
switch (c->type) {
|
|
case AVMEDIA_TYPE_AUDIO : decode_handler = avcodec_decode_audio4; break;
|
|
case AVMEDIA_TYPE_VIDEO : decode_handler = avcodec_decode_video2; break;
|
|
case AVMEDIA_TYPE_SUBTITLE: decode_handler = subtitle_handler ; break;
|
|
}
|
|
|
|
AVCodecContext* ctx = avcodec_alloc_context3(NULL);
|
|
if (!ctx)
|
|
error("Failed memory allocation");
|
|
|
|
ctx->max_pixels = 4096 * 4096; //To reduce false positive OOM and hangs
|
|
|
|
if (size > 1024) {
|
|
GetByteContext gbc;
|
|
bytestream2_init(&gbc, data + size - 1024, 1024);
|
|
ctx->width = bytestream2_get_le32(&gbc);
|
|
ctx->height = bytestream2_get_le32(&gbc);
|
|
ctx->bit_rate = bytestream2_get_le64(&gbc);
|
|
ctx->bits_per_coded_sample = bytestream2_get_le32(&gbc);
|
|
if (av_image_check_size(ctx->width, ctx->height, 0, ctx))
|
|
ctx->width = ctx->height = 0;
|
|
size -= 1024;
|
|
}
|
|
|
|
int res = avcodec_open2(ctx, c, NULL);
|
|
if (res < 0) {
|
|
av_free(ctx);
|
|
return 0; // Failure of avcodec_open2() does not imply that a issue was found
|
|
}
|
|
|
|
FDBCreate(&buffer);
|
|
int got_frame;
|
|
AVFrame *frame = av_frame_alloc();
|
|
if (!frame)
|
|
error("Failed memory allocation");
|
|
|
|
// Read very simple container
|
|
AVPacket avpkt;
|
|
while (data < end && it < maxiteration) {
|
|
// Search for the TAG
|
|
while (data + sizeof(fuzz_tag) < end) {
|
|
if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag)
|
|
break;
|
|
data++;
|
|
}
|
|
if (data + sizeof(fuzz_tag) > end)
|
|
data = end;
|
|
|
|
FDBPrepare(&buffer, &avpkt, last, data - last);
|
|
data += sizeof(fuzz_tag);
|
|
last = data;
|
|
|
|
// Iterate through all data
|
|
while (avpkt.size > 0 && it++ < maxiteration) {
|
|
av_frame_unref(frame);
|
|
int ret = decode_handler(ctx, frame, &got_frame, &avpkt);
|
|
|
|
if (it > 20)
|
|
ctx->error_concealment = 0;
|
|
|
|
if (ret <= 0 || ret > avpkt.size)
|
|
break;
|
|
if (ctx->codec_type != AVMEDIA_TYPE_AUDIO)
|
|
ret = avpkt.size;
|
|
avpkt.data += ret;
|
|
avpkt.size -= ret;
|
|
}
|
|
}
|
|
|
|
av_init_packet(&avpkt);
|
|
avpkt.data = NULL;
|
|
avpkt.size = 0;
|
|
|
|
do {
|
|
got_frame = 0;
|
|
decode_handler(ctx, frame, &got_frame, &avpkt);
|
|
} while (got_frame == 1 && it++ < maxiteration);
|
|
|
|
av_frame_free(&frame);
|
|
avcodec_free_context(&ctx);
|
|
av_freep(&ctx);
|
|
FDBDesroy(&buffer);
|
|
return 0;
|
|
}
|