2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 /* Targeted fuzzer that targets specific codecs depending on two
23 * Get the very fresh clang, e.g. see http://libfuzzer.info#versions
24 * Get and build libFuzzer:
25 svn co http://llvm.org/svn/llvm-project/llvm/trunk/lib/Fuzzer
27 * build ffmpeg for fuzzing:
28 FLAGS="-fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp -g" CC="clang $FLAGS" CXX="clang++ $FLAGS" ./configure --disable-x86asm
30 * build the fuzz target.
31 Choose the value of FFMPEG_CODEC (e.g. AV_CODEC_ID_DVD_SUBTITLE) and
32 choose one of FUZZ_FFMPEG_VIDEO, FUZZ_FFMPEG_AUDIO, FUZZ_FFMPEG_SUBTITLE.
33 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
34 * create a corpus directory and put some samples there (empty dir is ok too):
35 mkdir CORPUS && cp some-files CORPUS
38 ./target_dec_fuzzer -max_len=100000 CORPUS
42 http://tutorial.libfuzzer.info
43 https://github.com/google/oss-fuzz
44 http://lcamtuf.coredump.cx/afl/
45 https://security.googleblog.com/2016/08/guided-in-process-fuzzing-of-chrome.html
49 #include "libavutil/avassert.h"
50 #include "libavutil/imgutils.h"
51 #include "libavutil/intreadwrite.h"
53 #include "libavcodec/avcodec.h"
54 #include "libavcodec/bytestream.h"
55 #include "libavformat/avformat.h"
57 //For FF_SANE_NB_CHANNELS, so we dont waste energy testing things that will get instantly rejected
58 #include "libavcodec/internal.h"
60 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
62 extern AVCodec * codec_list[];
64 static void error(const char *err)
66 fprintf(stderr, "%s", err);
70 static AVCodec *c = NULL;
71 static AVCodec *AVCodecInitialize(enum AVCodecID codec_id)
75 res = avcodec_find_decoder(codec_id);
77 error("Failed to find decoder");
81 static int subtitle_handler(AVCodecContext *avctx, void *frame,
82 int *got_sub_ptr, AVPacket *avpkt)
85 int ret = avcodec_decode_subtitle2(avctx, &sub, got_sub_ptr, avpkt);
86 if (ret >= 0 && *got_sub_ptr)
87 avsubtitle_free(&sub);
91 static int audio_video_handler(AVCodecContext *avctx, AVFrame *frame,
92 int *got_frame, const AVPacket *dummy)
94 int ret = avcodec_receive_frame(avctx, frame);
95 *got_frame = ret >= 0;
99 // Ensure we don't loop forever
100 const uint32_t maxiteration = 8096;
101 uint64_t maxpixels_per_frame = 4096 * 4096;
104 uint64_t maxsamples_per_frame = 256*1024*32;
107 static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
109 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
110 const uint64_t fuzz_tag = FUZZ_TAG;
111 const uint8_t *last = data;
112 const uint8_t *end = data + size;
114 uint64_t ec_pixels = 0;
115 uint64_t nb_samples = 0;
116 int (*decode_handler)(AVCodecContext *avctx, AVFrame *picture,
117 int *got_picture_ptr,
118 const AVPacket *avpkt) = NULL;
119 AVCodecParserContext *parser = NULL;
120 uint64_t keyframes = 0;
121 uint64_t flushpattern = -1;
122 AVDictionary *opts = NULL;
125 #ifdef FFMPEG_DECODER
126 #define DECODER_SYMBOL0(CODEC) ff_##CODEC##_decoder
127 #define DECODER_SYMBOL(CODEC) DECODER_SYMBOL0(CODEC)
128 extern AVCodec DECODER_SYMBOL(FFMPEG_DECODER);
129 codec_list[0] = &DECODER_SYMBOL(FFMPEG_DECODER);
131 #if FFMPEG_DECODER == tiff || FFMPEG_DECODER == tdsc
132 extern AVCodec DECODER_SYMBOL(mjpeg);
133 codec_list[1] = &DECODER_SYMBOL(mjpeg);
136 c = &DECODER_SYMBOL(FFMPEG_DECODER);
138 c = AVCodecInitialize(FFMPEG_CODEC); // Done once.
140 av_log_set_level(AV_LOG_PANIC);
144 case AVMEDIA_TYPE_AUDIO :
145 case AVMEDIA_TYPE_VIDEO : decode_handler = audio_video_handler ; break;
146 case AVMEDIA_TYPE_SUBTITLE: decode_handler = subtitle_handler ; break;
149 case AV_CODEC_ID_APE: maxsamples_per_frame /= 256; break;
151 maxpixels = maxpixels_per_frame * maxiteration;
152 maxsamples = maxsamples_per_frame * maxiteration;
154 case AV_CODEC_ID_AGM: maxpixels /= 1024; break;
155 case AV_CODEC_ID_BINKVIDEO: maxpixels /= 32; break;
156 case AV_CODEC_ID_CFHD: maxpixels /= 128; break;
157 case AV_CODEC_ID_DIRAC: maxpixels /= 8192; break;
158 case AV_CODEC_ID_DST: maxsamples /= 1<<20; break;
159 case AV_CODEC_ID_DXV: maxpixels /= 32; break;
160 case AV_CODEC_ID_FFWAVESYNTH: maxsamples /= 16384; break;
161 case AV_CODEC_ID_G2M: maxpixels /= 1024; break;
162 case AV_CODEC_ID_GDV: maxpixels /= 512; break;
163 case AV_CODEC_ID_GIF: maxpixels /= 16; break;
164 case AV_CODEC_ID_HAP: maxpixels /= 128; break;
165 case AV_CODEC_ID_HEVC: maxpixels /= 16384; break;
166 case AV_CODEC_ID_HNM4_VIDEO: maxpixels /= 128; break;
167 case AV_CODEC_ID_IFF_ILBM: maxpixels /= 128; break;
168 case AV_CODEC_ID_INDEO4: maxpixels /= 128; break;
169 case AV_CODEC_ID_INTERPLAY_ACM: maxsamples /= 16384; break;
170 case AV_CODEC_ID_LAGARITH: maxpixels /= 1024; break;
171 case AV_CODEC_ID_LSCR: maxpixels /= 16; break;
172 case AV_CODEC_ID_MOTIONPIXELS:maxpixels /= 256; break;
173 case AV_CODEC_ID_MP4ALS: maxsamples /= 65536; break;
174 case AV_CODEC_ID_MSRLE: maxpixels /= 16; break;
175 case AV_CODEC_ID_MSS2: maxpixels /= 16384; break;
176 case AV_CODEC_ID_MSZH: maxpixels /= 128; break;
177 case AV_CODEC_ID_OPUS: maxsamples /= 16384; break;
178 case AV_CODEC_ID_PNG: maxpixels /= 128; break;
179 case AV_CODEC_ID_APNG: maxpixels /= 128; break;
180 case AV_CODEC_ID_QTRLE: maxpixels /= 16; break;
181 case AV_CODEC_ID_RASC: maxpixels /= 16; break;
182 case AV_CODEC_ID_SANM: maxpixels /= 16; break;
183 case AV_CODEC_ID_SCPR: maxpixels /= 32; break;
184 case AV_CODEC_ID_SCREENPRESSO:maxpixels /= 64; break;
185 case AV_CODEC_ID_SMACKVIDEO: maxpixels /= 64; break;
186 case AV_CODEC_ID_SNOW: maxpixels /= 128; break;
187 case AV_CODEC_ID_TGV: maxpixels /= 32; break;
188 case AV_CODEC_ID_TRUEMOTION2: maxpixels /= 1024; break;
189 case AV_CODEC_ID_VC1IMAGE: maxpixels /= 8192; break;
190 case AV_CODEC_ID_VMNC: maxpixels /= 8192; break;
191 case AV_CODEC_ID_VP7: maxpixels /= 256; break;
192 case AV_CODEC_ID_VP9: maxpixels /= 4096; break;
193 case AV_CODEC_ID_WMV3IMAGE: maxpixels /= 8192; break;
194 case AV_CODEC_ID_WS_VQA: maxpixels /= 16384; break;
195 case AV_CODEC_ID_WMALOSSLESS: maxsamples /= 1024; break;
196 case AV_CODEC_ID_ZEROCODEC: maxpixels /= 128; break;
199 maxsamples_per_frame = FFMIN(maxsamples_per_frame, maxsamples);
200 maxpixels_per_frame = FFMIN(maxpixels_per_frame , maxpixels);
202 AVCodecContext* ctx = avcodec_alloc_context3(c);
203 AVCodecContext* parser_avctx = avcodec_alloc_context3(NULL);
204 if (!ctx || !parser_avctx)
205 error("Failed memory allocation");
207 if (ctx->max_pixels == 0 || ctx->max_pixels > maxpixels_per_frame)
208 ctx->max_pixels = maxpixels_per_frame; //To reduce false positive OOM and hangs
210 ctx->max_samples = maxsamples_per_frame;
217 bytestream2_init(&gbc, data + size, 1024);
218 ctx->width = bytestream2_get_le32(&gbc);
219 ctx->height = bytestream2_get_le32(&gbc);
220 ctx->bit_rate = bytestream2_get_le64(&gbc);
221 ctx->bits_per_coded_sample = bytestream2_get_le32(&gbc);
222 // Try to initialize a parser for this codec, note, this may fail which just means we test without one
223 flags = bytestream2_get_byte(&gbc);
225 parser = av_parser_init(c->id);
227 ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
229 ctx->err_recognition = AV_EF_AGGRESSIVE | AV_EF_COMPLIANT | AV_EF_CAREFUL;
231 ctx->err_recognition |= AV_EF_EXPLODE;
233 if ((flags & 0x10) && c->id != AV_CODEC_ID_H264)
234 ctx->flags2 |= AV_CODEC_FLAG2_FAST;
237 av_force_cpu_flags(0);
239 extradata_size = bytestream2_get_le32(&gbc);
241 ctx->sample_rate = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
242 ctx->channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS;
243 ctx->block_align = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
244 ctx->codec_tag = bytestream2_get_le32(&gbc);
247 for (n = 0; c->codec_tags[n] != FF_CODEC_TAGS_END; n++);
248 ctx->codec_tag = c->codec_tags[ctx->codec_tag % n];
250 keyframes = bytestream2_get_le64(&gbc);
251 ctx->request_channel_layout = bytestream2_get_le64(&gbc);
253 ctx->idct_algo = bytestream2_get_byte(&gbc) % 25;
254 flushpattern = bytestream2_get_le64(&gbc);
257 switch (ctx->codec_id) {
258 case AV_CODEC_ID_AC3:
259 case AV_CODEC_ID_EAC3:
260 av_dict_set_int(&opts, "cons_noisegen", bytestream2_get_byte(&gbc) & 1, 0);
261 av_dict_set_int(&opts, "heavy_compr", bytestream2_get_byte(&gbc) & 1, 0);
262 av_dict_set_int(&opts, "target_level", (int)(bytestream2_get_byte(&gbc) % 32) - 31, 0);
263 av_dict_set_int(&opts, "dmix_mode", (int)(bytestream2_get_byte(&gbc) % 4) - 1, 0);
269 if (extradata_size < size) {
270 ctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
271 if (ctx->extradata) {
272 ctx->extradata_size = extradata_size;
273 size -= ctx->extradata_size;
274 memcpy(ctx->extradata, data + size, ctx->extradata_size);
277 if (av_image_check_size(ctx->width, ctx->height, 0, ctx))
278 ctx->width = ctx->height = 0;
281 int res = avcodec_open2(ctx, c, &opts);
283 avcodec_free_context(&ctx);
284 av_free(parser_avctx);
285 av_parser_close(parser);
287 return 0; // Failure of avcodec_open2() does not imply that a issue was found
289 parser_avctx->codec_id = ctx->codec_id;
292 AVFrame *frame = av_frame_alloc();
294 error("Failed memory allocation");
296 // Read very simple container
297 AVPacket avpkt, parsepkt;
298 av_init_packet(&avpkt);
299 av_init_packet(&parsepkt);
300 while (data < end && it < maxiteration) {
301 // Search for the TAG
302 while (data + sizeof(fuzz_tag) < end) {
303 if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag)
307 if (data + sizeof(fuzz_tag) > end)
310 res = av_new_packet(&parsepkt, data - last);
312 error("Failed memory allocation");
313 memcpy(parsepkt.data, last, data - last);
314 parsepkt.flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY;
315 keyframes = (keyframes >> 2) + (keyframes<<62);
316 data += sizeof(fuzz_tag);
319 while (parsepkt.size > 0) {
323 av_init_packet(&avpkt);
324 int ret = av_parser_parse2(parser, parser_avctx, &avpkt.data, &avpkt.size,
325 parsepkt.data, parsepkt.size,
326 parsepkt.pts, parsepkt.dts, parsepkt.pos);
327 if (avpkt.data == parsepkt.data) {
328 avpkt.buf = av_buffer_ref(parsepkt.buf);
330 error("Failed memory allocation");
332 if (av_packet_make_refcounted(&avpkt) < 0)
333 error("Failed memory allocation");
335 parsepkt.data += ret;
336 parsepkt.size -= ret;
338 avpkt.pts = parser->pts;
339 avpkt.dts = parser->dts;
340 avpkt.pos = parser->pos;
341 if ( parser->key_frame == 1 ||
342 (parser->key_frame == -1 && parser->pict_type == AV_PICTURE_TYPE_I))
343 avpkt.flags |= AV_PKT_FLAG_KEY;
344 avpkt.flags |= parsepkt.flags & AV_PKT_FLAG_DISCARD;
346 av_packet_move_ref(&avpkt, &parsepkt);
349 if (!(flushpattern & 7))
350 avcodec_flush_buffers(ctx);
351 flushpattern = (flushpattern >> 3) + (flushpattern << 61);
353 if (ctx->codec_type != AVMEDIA_TYPE_SUBTITLE) {
354 int ret = avcodec_send_packet(ctx, &avpkt);
355 decode_more = ret >= 0;
357 ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL);
358 if (it > 20 || ec_pixels > 4 * ctx->max_pixels)
359 ctx->error_concealment = 0;
360 if (ec_pixels > maxpixels)
361 goto maximums_reached;
366 // Iterate through all data
367 while (decode_more && it++ < maxiteration) {
368 av_frame_unref(frame);
369 int ret = decode_handler(ctx, frame, &got_frame, &avpkt);
371 ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL);
372 if (it > 20 || ec_pixels > 4 * ctx->max_pixels)
373 ctx->error_concealment = 0;
374 if (ec_pixels > maxpixels)
375 goto maximums_reached;
377 if (ctx->codec_type == AVMEDIA_TYPE_AUDIO &&
378 frame->nb_samples == 0 && !got_frame &&
379 (avpkt.flags & AV_PKT_FLAG_DISCARD))
380 nb_samples += ctx->max_samples;
382 nb_samples += frame->nb_samples;
383 if (nb_samples > maxsamples)
384 goto maximums_reached;
386 if (ret <= 0 || ret > avpkt.size)
389 if (ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
392 decode_more = avpkt.size > 0;
394 decode_more = ret >= 0;
396 av_packet_unref(&avpkt);
398 av_packet_unref(&parsepkt);
402 av_packet_unref(&avpkt);
404 if (ctx->codec_type != AVMEDIA_TYPE_SUBTITLE)
405 avcodec_send_packet(ctx, NULL);
409 av_frame_unref(frame);
410 decode_handler(ctx, frame, &got_frame, &avpkt);
411 } while (got_frame == 1 && it++ < maxiteration);
413 fprintf(stderr, "pixels decoded: %"PRId64", samples decoded: %"PRId64", iterations: %d\n", ec_pixels, nb_samples, it);
415 av_frame_free(&frame);
416 avcodec_free_context(&ctx);
417 avcodec_free_context(&parser_avctx);
418 av_parser_close(parser);
419 av_packet_unref(&parsepkt);