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 // Ensure we don't loop forever
92 const uint32_t maxiteration = 8096;
93 const uint64_t maxpixels_per_frame = 4096 * 4096;
96 uint64_t maxsamples_per_frame = 256*1024*32;
99 static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
101 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
102 const uint64_t fuzz_tag = FUZZ_TAG;
103 const uint8_t *last = data;
104 const uint8_t *end = data + size;
106 uint64_t ec_pixels = 0;
107 uint64_t nb_samples = 0;
108 int (*decode_handler)(AVCodecContext *avctx, AVFrame *picture,
109 int *got_picture_ptr,
110 const AVPacket *avpkt) = NULL;
111 AVCodecParserContext *parser = NULL;
112 uint64_t keyframes = 0;
113 uint64_t flushpattern = -1;
114 AVDictionary *opts = NULL;
117 #ifdef FFMPEG_DECODER
118 #define DECODER_SYMBOL0(CODEC) ff_##CODEC##_decoder
119 #define DECODER_SYMBOL(CODEC) DECODER_SYMBOL0(CODEC)
120 extern AVCodec DECODER_SYMBOL(FFMPEG_DECODER);
121 codec_list[0] = &DECODER_SYMBOL(FFMPEG_DECODER);
123 #if FFMPEG_DECODER == tiff || FFMPEG_DECODER == tdsc
124 extern AVCodec DECODER_SYMBOL(mjpeg);
125 codec_list[1] = &DECODER_SYMBOL(mjpeg);
128 c = &DECODER_SYMBOL(FFMPEG_DECODER);
130 c = AVCodecInitialize(FFMPEG_CODEC); // Done once.
132 av_log_set_level(AV_LOG_PANIC);
136 case AVMEDIA_TYPE_AUDIO : decode_handler = avcodec_decode_audio4; break;
137 case AVMEDIA_TYPE_VIDEO : decode_handler = avcodec_decode_video2; break;
138 case AVMEDIA_TYPE_SUBTITLE: decode_handler = subtitle_handler ; break;
141 case AV_CODEC_ID_APE: maxsamples_per_frame /= 256; break;
143 maxpixels = maxpixels_per_frame * maxiteration;
144 maxsamples = maxsamples_per_frame * maxiteration;
146 case AV_CODEC_ID_AGM: maxpixels /= 1024; break;
147 case AV_CODEC_ID_BINKVIDEO: maxpixels /= 32; break;
148 case AV_CODEC_ID_CFHD: maxpixels /= 128; break;
149 case AV_CODEC_ID_DIRAC: maxpixels /= 8192; break;
150 case AV_CODEC_ID_DST: maxsamples /= 1<<20; break;
151 case AV_CODEC_ID_DXV: maxpixels /= 32; break;
152 case AV_CODEC_ID_FFWAVESYNTH: maxsamples /= 16384; break;
153 case AV_CODEC_ID_G2M: maxpixels /= 64; break;
154 case AV_CODEC_ID_GDV: maxpixels /= 512; break;
155 case AV_CODEC_ID_GIF: maxpixels /= 16; break;
156 case AV_CODEC_ID_HAP: maxpixels /= 128; break;
157 case AV_CODEC_ID_HEVC: maxpixels /= 16384; break;
158 case AV_CODEC_ID_HNM4_VIDEO: maxpixels /= 128; break;
159 case AV_CODEC_ID_IFF_ILBM: maxpixels /= 128; break;
160 case AV_CODEC_ID_INDEO4: maxpixels /= 128; break;
161 case AV_CODEC_ID_LAGARITH: maxpixels /= 1024; break;
162 case AV_CODEC_ID_LSCR: maxpixels /= 16; break;
163 case AV_CODEC_ID_MOTIONPIXELS:maxpixels /= 256; break;
164 case AV_CODEC_ID_MP4ALS: maxsamples /= 65536; break;
165 case AV_CODEC_ID_MSRLE: maxpixels /= 16; break;
166 case AV_CODEC_ID_MSS2: maxpixels /= 16384; break;
167 case AV_CODEC_ID_MSZH: maxpixels /= 128; break;
168 case AV_CODEC_ID_OPUS: maxsamples /= 16384; break;
169 case AV_CODEC_ID_PNG: maxpixels /= 128; break;
170 case AV_CODEC_ID_APNG: maxpixels /= 128; break;
171 case AV_CODEC_ID_QTRLE: maxpixels /= 16; break;
172 case AV_CODEC_ID_RASC: maxpixels /= 16; break;
173 case AV_CODEC_ID_SANM: maxpixels /= 16; break;
174 case AV_CODEC_ID_SCPR: maxpixels /= 32; break;
175 case AV_CODEC_ID_SCREENPRESSO:maxpixels /= 64; break;
176 case AV_CODEC_ID_SMACKVIDEO: maxpixels /= 64; break;
177 case AV_CODEC_ID_SNOW: maxpixels /= 128; break;
178 case AV_CODEC_ID_TGV: maxpixels /= 32; break;
179 case AV_CODEC_ID_TRUEMOTION2: maxpixels /= 1024; break;
180 case AV_CODEC_ID_VP7: maxpixels /= 256; break;
181 case AV_CODEC_ID_VP9: maxpixels /= 4096; break;
182 case AV_CODEC_ID_WMV3IMAGE: maxpixels /= 8192; break;
183 case AV_CODEC_ID_WS_VQA: maxpixels /= 16384; break;
184 case AV_CODEC_ID_WMALOSSLESS: maxsamples /= 1024; break;
185 case AV_CODEC_ID_ZEROCODEC: maxpixels /= 128; break;
188 maxsamples_per_frame = FFMIN(maxsamples_per_frame, maxsamples);
190 AVCodecContext* ctx = avcodec_alloc_context3(c);
191 AVCodecContext* parser_avctx = avcodec_alloc_context3(NULL);
192 if (!ctx || !parser_avctx)
193 error("Failed memory allocation");
195 if (ctx->max_pixels == 0 || ctx->max_pixels > maxpixels_per_frame)
196 ctx->max_pixels = maxpixels_per_frame; //To reduce false positive OOM and hangs
197 ctx->refcounted_frames = 1; //To reduce false positive timeouts and focus testing on the refcounted API
199 ctx->max_samples = maxsamples_per_frame;
206 bytestream2_init(&gbc, data + size, 1024);
207 ctx->width = bytestream2_get_le32(&gbc);
208 ctx->height = bytestream2_get_le32(&gbc);
209 ctx->bit_rate = bytestream2_get_le64(&gbc);
210 ctx->bits_per_coded_sample = bytestream2_get_le32(&gbc);
211 // Try to initialize a parser for this codec, note, this may fail which just means we test without one
212 flags = bytestream2_get_byte(&gbc);
214 parser = av_parser_init(c->id);
216 ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
218 ctx->err_recognition = AV_EF_AGGRESSIVE | AV_EF_COMPLIANT | AV_EF_CAREFUL;
220 ctx->err_recognition |= AV_EF_EXPLODE;
222 if ((flags & 0x10) && c->id != AV_CODEC_ID_H264)
223 ctx->flags2 |= AV_CODEC_FLAG2_FAST;
226 av_force_cpu_flags(0);
228 extradata_size = bytestream2_get_le32(&gbc);
230 ctx->sample_rate = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
231 ctx->channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS;
232 ctx->block_align = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
233 ctx->codec_tag = bytestream2_get_le32(&gbc);
236 for (n = 0; c->codec_tags[n] != FF_CODEC_TAGS_END; n++);
237 ctx->codec_tag = c->codec_tags[ctx->codec_tag % n];
239 keyframes = bytestream2_get_le64(&gbc);
240 ctx->request_channel_layout = bytestream2_get_le64(&gbc);
242 ctx->idct_algo = bytestream2_get_byte(&gbc) % 25;
243 flushpattern = bytestream2_get_le64(&gbc);
246 switch (ctx->codec_id) {
247 case AV_CODEC_ID_AC3:
248 case AV_CODEC_ID_EAC3:
249 av_dict_set_int(&opts, "cons_noisegen", bytestream2_get_byte(&gbc) & 1, 0);
250 av_dict_set_int(&opts, "heavy_compr", bytestream2_get_byte(&gbc) & 1, 0);
251 av_dict_set_int(&opts, "target_level", (int)(bytestream2_get_byte(&gbc) % 32) - 31, 0);
252 av_dict_set_int(&opts, "dmix_mode", (int)(bytestream2_get_byte(&gbc) % 4) - 1, 0);
258 if (extradata_size < size) {
259 ctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
260 if (ctx->extradata) {
261 ctx->extradata_size = extradata_size;
262 size -= ctx->extradata_size;
263 memcpy(ctx->extradata, data + size, ctx->extradata_size);
266 if (av_image_check_size(ctx->width, ctx->height, 0, ctx))
267 ctx->width = ctx->height = 0;
270 int res = avcodec_open2(ctx, c, &opts);
272 avcodec_free_context(&ctx);
273 av_free(parser_avctx);
274 av_parser_close(parser);
276 return 0; // Failure of avcodec_open2() does not imply that a issue was found
278 parser_avctx->codec_id = ctx->codec_id;
281 AVFrame *frame = av_frame_alloc();
283 error("Failed memory allocation");
285 // Read very simple container
286 AVPacket avpkt, parsepkt;
287 av_init_packet(&avpkt);
288 av_init_packet(&parsepkt);
289 while (data < end && it < maxiteration) {
290 // Search for the TAG
291 while (data + sizeof(fuzz_tag) < end) {
292 if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag)
296 if (data + sizeof(fuzz_tag) > end)
299 res = av_new_packet(&parsepkt, data - last);
301 error("Failed memory allocation");
302 memcpy(parsepkt.data, last, data - last);
303 parsepkt.flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY;
304 keyframes = (keyframes >> 2) + (keyframes<<62);
305 data += sizeof(fuzz_tag);
308 while (parsepkt.size > 0) {
311 av_init_packet(&avpkt);
312 int ret = av_parser_parse2(parser, parser_avctx, &avpkt.data, &avpkt.size,
313 parsepkt.data, parsepkt.size,
314 parsepkt.pts, parsepkt.dts, parsepkt.pos);
315 if (avpkt.data == parsepkt.data) {
316 avpkt.buf = av_buffer_ref(parsepkt.buf);
318 error("Failed memory allocation");
320 if (av_packet_make_refcounted(&avpkt) < 0)
321 error("Failed memory allocation");
323 parsepkt.data += ret;
324 parsepkt.size -= ret;
326 avpkt.pts = parser->pts;
327 avpkt.dts = parser->dts;
328 avpkt.pos = parser->pos;
329 if ( parser->key_frame == 1 ||
330 (parser->key_frame == -1 && parser->pict_type == AV_PICTURE_TYPE_I))
331 avpkt.flags |= AV_PKT_FLAG_KEY;
332 avpkt.flags |= parsepkt.flags & AV_PKT_FLAG_DISCARD;
334 av_packet_move_ref(&avpkt, &parsepkt);
337 if (!(flushpattern & 7))
338 avcodec_flush_buffers(ctx);
339 flushpattern = (flushpattern >> 3) + (flushpattern << 61);
341 // Iterate through all data
342 while (avpkt.size > 0 && it++ < maxiteration) {
343 av_frame_unref(frame);
344 int ret = decode_handler(ctx, frame, &got_frame, &avpkt);
346 ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL);
347 if (it > 20 || ec_pixels > 4 * ctx->max_pixels)
348 ctx->error_concealment = 0;
349 if (ec_pixels > maxpixels)
350 goto maximums_reached;
352 if (ctx->codec_type == AVMEDIA_TYPE_AUDIO &&
353 frame->nb_samples == 0 && !got_frame &&
354 (avpkt.flags & AV_PKT_FLAG_DISCARD))
355 nb_samples += ctx->max_samples;
357 nb_samples += frame->nb_samples;
358 if (nb_samples > maxsamples)
359 goto maximums_reached;
361 if (ret <= 0 || ret > avpkt.size)
363 if (ctx->codec_type != AVMEDIA_TYPE_AUDIO)
368 av_packet_unref(&avpkt);
370 av_packet_unref(&parsepkt);
374 av_packet_unref(&avpkt);
378 av_frame_unref(frame);
379 decode_handler(ctx, frame, &got_frame, &avpkt);
380 } while (got_frame == 1 && it++ < maxiteration);
382 fprintf(stderr, "pixels decoded: %"PRId64", samples decoded: %"PRId64", iterations: %d\n", ec_pixels, nb_samples, it);
384 av_frame_free(&frame);
385 avcodec_free_context(&ctx);
386 avcodec_free_context(&parser_avctx);
387 av_parser_close(parser);
388 av_packet_unref(&parsepkt);