| /* |
| * 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" |
| |
| //For FF_SANE_NB_CHANNELS, so we dont waste energy testing things that will get instantly rejected |
| #include "libavcodec/internal.h" |
| |
| int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size); |
| |
| extern AVCodec * codec_list[]; |
| |
| 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; |
| } |
| |
| // Ensure we don't loop forever |
| const uint32_t maxiteration = 8096; |
| const uint64_t maxpixels_per_frame = 4096 * 4096; |
| uint64_t maxpixels; |
| |
| uint64_t maxsamples_per_frame = 256*1024*32; |
| uint64_t maxsamples; |
| |
| static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL; |
| |
| int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { |
| const uint64_t fuzz_tag = FUZZ_TAG; |
| const uint8_t *last = data; |
| const uint8_t *end = data + size; |
| uint32_t it = 0; |
| uint64_t ec_pixels = 0; |
| uint64_t nb_samples = 0; |
| int (*decode_handler)(AVCodecContext *avctx, AVFrame *picture, |
| int *got_picture_ptr, |
| const AVPacket *avpkt) = NULL; |
| AVCodecParserContext *parser = NULL; |
| uint64_t keyframes = 0; |
| AVDictionary *opts = 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); |
| codec_list[0] = &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); |
| } |
| |
| 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; |
| } |
| switch (c->id) { |
| case AV_CODEC_ID_APE: maxsamples_per_frame /= 256; break; |
| } |
| maxpixels = maxpixels_per_frame * maxiteration; |
| maxsamples = maxsamples_per_frame * maxiteration; |
| switch (c->id) { |
| case AV_CODEC_ID_BINKVIDEO: maxpixels /= 32; break; |
| case AV_CODEC_ID_CFHD: maxpixels /= 128; break; |
| case AV_CODEC_ID_DIRAC: maxpixels /= 8192; break; |
| case AV_CODEC_ID_DST: maxsamples /= 8192; break; |
| case AV_CODEC_ID_DXV: maxpixels /= 32; break; |
| case AV_CODEC_ID_FFWAVESYNTH: maxsamples /= 16384; break; |
| case AV_CODEC_ID_G2M: maxpixels /= 64; break; |
| case AV_CODEC_ID_GDV: maxpixels /= 512; break; |
| case AV_CODEC_ID_GIF: maxpixels /= 16; break; |
| case AV_CODEC_ID_HNM4_VIDEO: maxpixels /= 128; break; |
| case AV_CODEC_ID_IFF_ILBM: maxpixels /= 128; break; |
| case AV_CODEC_ID_INDEO4: maxpixels /= 128; break; |
| case AV_CODEC_ID_LSCR: maxpixels /= 16; break; |
| case AV_CODEC_ID_MOTIONPIXELS:maxpixels /= 256; break; |
| case AV_CODEC_ID_MP4ALS: maxsamples /= 65536; break; |
| case AV_CODEC_ID_MSRLE: maxpixels /= 16; break; |
| case AV_CODEC_ID_MSS2: maxpixels /= 16384; break; |
| case AV_CODEC_ID_MSZH: maxpixels /= 128; break; |
| case AV_CODEC_ID_QTRLE: maxpixels /= 16; break; |
| case AV_CODEC_ID_RASC: maxpixels /= 16; break; |
| case AV_CODEC_ID_SANM: maxpixels /= 16; break; |
| case AV_CODEC_ID_SCPR: maxpixels /= 32; break; |
| case AV_CODEC_ID_SCREENPRESSO:maxpixels /= 64; break; |
| case AV_CODEC_ID_SMACKVIDEO: maxpixels /= 64; break; |
| case AV_CODEC_ID_SNOW: maxpixels /= 128; break; |
| case AV_CODEC_ID_TGV: maxpixels /= 32; break; |
| case AV_CODEC_ID_TRUEMOTION2: maxpixels /= 1024; break; |
| case AV_CODEC_ID_VP7: maxpixels /= 256; break; |
| case AV_CODEC_ID_VP9: maxpixels /= 4096; break; |
| case AV_CODEC_ID_ZEROCODEC: maxpixels /= 128; break; |
| } |
| |
| |
| AVCodecContext* ctx = avcodec_alloc_context3(c); |
| AVCodecContext* parser_avctx = avcodec_alloc_context3(NULL); |
| if (!ctx || !parser_avctx) |
| error("Failed memory allocation"); |
| |
| if (ctx->max_pixels == 0 || ctx->max_pixels > maxpixels_per_frame) |
| ctx->max_pixels = maxpixels_per_frame; //To reduce false positive OOM and hangs |
| ctx->refcounted_frames = 1; //To reduce false positive timeouts and focus testing on the refcounted API |
| |
| ctx->max_samples = maxsamples_per_frame; |
| |
| if (size > 1024) { |
| GetByteContext gbc; |
| int extradata_size; |
| int flags; |
| size -= 1024; |
| bytestream2_init(&gbc, data + size, 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); |
| // Try to initialize a parser for this codec, note, this may fail which just means we test without one |
| flags = bytestream2_get_byte(&gbc); |
| if (flags & 1) |
| parser = av_parser_init(c->id); |
| if (flags & 2) |
| ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL; |
| if (flags & 4) { |
| ctx->err_recognition = AV_EF_AGGRESSIVE | AV_EF_COMPLIANT | AV_EF_CAREFUL; |
| if (flags & 8) |
| ctx->err_recognition |= AV_EF_EXPLODE; |
| } |
| if (flags & 0x10) |
| ctx->flags2 |= AV_CODEC_FLAG2_FAST; |
| |
| if (flags & 0x40) |
| av_force_cpu_flags(0); |
| |
| extradata_size = bytestream2_get_le32(&gbc); |
| |
| ctx->sample_rate = bytestream2_get_le32(&gbc) & 0x7FFFFFFF; |
| ctx->channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS; |
| ctx->block_align = bytestream2_get_le32(&gbc) & 0x7FFFFFFF; |
| ctx->codec_tag = bytestream2_get_le32(&gbc); |
| if (c->codec_tags) { |
| int n; |
| for (n = 0; c->codec_tags[n] != FF_CODEC_TAGS_END; n++); |
| ctx->codec_tag = c->codec_tags[ctx->codec_tag % n]; |
| } |
| keyframes = bytestream2_get_le64(&gbc); |
| ctx->request_channel_layout = bytestream2_get_le64(&gbc); |
| |
| ctx->idct_algo = bytestream2_get_byte(&gbc) % 25; |
| |
| if (flags & 0x20) { |
| switch (ctx->codec_id) { |
| case AV_CODEC_ID_AC3: |
| case AV_CODEC_ID_EAC3: |
| av_dict_set_int(&opts, "cons_noisegen", bytestream2_get_byte(&gbc) & 1, 0); |
| av_dict_set_int(&opts, "heavy_compr", bytestream2_get_byte(&gbc) & 1, 0); |
| av_dict_set_int(&opts, "target_level", (int)(bytestream2_get_byte(&gbc) % 32) - 31, 0); |
| av_dict_set_int(&opts, "dmix_mode", (int)(bytestream2_get_byte(&gbc) % 4) - 1, 0); |
| break; |
| } |
| } |
| |
| |
| if (extradata_size < size) { |
| ctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); |
| if (ctx->extradata) { |
| ctx->extradata_size = extradata_size; |
| size -= ctx->extradata_size; |
| memcpy(ctx->extradata, data + size, ctx->extradata_size); |
| } |
| } |
| if (av_image_check_size(ctx->width, ctx->height, 0, ctx)) |
| ctx->width = ctx->height = 0; |
| } |
| |
| int res = avcodec_open2(ctx, c, &opts); |
| if (res < 0) { |
| avcodec_free_context(&ctx); |
| av_free(parser_avctx); |
| av_parser_close(parser); |
| av_dict_free(&opts); |
| return 0; // Failure of avcodec_open2() does not imply that a issue was found |
| } |
| parser_avctx->codec_id = ctx->codec_id; |
| |
| int got_frame; |
| AVFrame *frame = av_frame_alloc(); |
| if (!frame) |
| error("Failed memory allocation"); |
| |
| // Read very simple container |
| AVPacket avpkt, parsepkt; |
| av_init_packet(&avpkt); |
| av_init_packet(&parsepkt); |
| 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; |
| |
| res = av_new_packet(&parsepkt, data - last); |
| if (res < 0) |
| error("Failed memory allocation"); |
| memcpy(parsepkt.data, last, data - last); |
| parsepkt.flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY; |
| keyframes = (keyframes >> 2) + (keyframes<<62); |
| data += sizeof(fuzz_tag); |
| last = data; |
| |
| while (parsepkt.size > 0) { |
| |
| if (parser) { |
| av_init_packet(&avpkt); |
| int ret = av_parser_parse2(parser, parser_avctx, &avpkt.data, &avpkt.size, |
| parsepkt.data, parsepkt.size, |
| parsepkt.pts, parsepkt.dts, parsepkt.pos); |
| if (avpkt.data == parsepkt.data) { |
| avpkt.buf = av_buffer_ref(parsepkt.buf); |
| if (!avpkt.buf) |
| error("Failed memory allocation"); |
| } else { |
| if (av_packet_make_refcounted(&avpkt) < 0) |
| error("Failed memory allocation"); |
| } |
| parsepkt.data += ret; |
| parsepkt.size -= ret; |
| parsepkt.pos += ret; |
| avpkt.pts = parser->pts; |
| avpkt.dts = parser->dts; |
| avpkt.pos = parser->pos; |
| if ( parser->key_frame == 1 || |
| (parser->key_frame == -1 && parser->pict_type == AV_PICTURE_TYPE_I)) |
| avpkt.flags |= AV_PKT_FLAG_KEY; |
| avpkt.flags |= parsepkt.flags & AV_PKT_FLAG_DISCARD; |
| } else { |
| av_packet_move_ref(&avpkt, &parsepkt); |
| } |
| |
| // Iterate through all data |
| while (avpkt.size > 0 && it++ < maxiteration) { |
| av_frame_unref(frame); |
| int ret = decode_handler(ctx, frame, &got_frame, &avpkt); |
| |
| ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL); |
| if (it > 20 || ec_pixels > 4 * ctx->max_pixels) |
| ctx->error_concealment = 0; |
| if (ec_pixels > maxpixels) |
| goto maximums_reached; |
| |
| nb_samples += frame->nb_samples; |
| if (nb_samples > maxsamples) |
| goto maximums_reached; |
| |
| if (ret <= 0 || ret > avpkt.size) |
| break; |
| if (ctx->codec_type != AVMEDIA_TYPE_AUDIO) |
| ret = avpkt.size; |
| avpkt.data += ret; |
| avpkt.size -= ret; |
| } |
| av_packet_unref(&avpkt); |
| } |
| av_packet_unref(&parsepkt); |
| } |
| maximums_reached: |
| |
| av_packet_unref(&avpkt); |
| |
| do { |
| got_frame = 0; |
| av_frame_unref(frame); |
| decode_handler(ctx, frame, &got_frame, &avpkt); |
| } while (got_frame == 1 && it++ < maxiteration); |
| |
| fprintf(stderr, "pixels decoded: %"PRId64", samples decoded: %"PRId64", iterations: %d\n", ec_pixels, nb_samples, it); |
| |
| av_frame_free(&frame); |
| avcodec_free_context(&ctx); |
| avcodec_free_context(&parser_avctx); |
| av_parser_close(parser); |
| av_packet_unref(&parsepkt); |
| av_dict_free(&opts); |
| return 0; |
| } |
