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tools: add a fuzzer tool for bitstream filters

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Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2019-11-30 15:57:44 -03:00
parent 37f31f4e50
commit 964eb754b4
4 changed files with 161 additions and 0 deletions
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3
Makefile
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@ -50,6 +50,9 @@ $(TOOLS): %$(EXESUF): %.o
target_dec_%_fuzzer$(EXESUF): target_dec_%_fuzzer.o $(FF_DEP_LIBS)
$(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $^ $(ELIBS) $(FF_EXTRALIBS) $(LIBFUZZER_PATH)
tools/target_bsf_%_fuzzer$(EXESUF): tools/target_bsf_%_fuzzer.o $(FF_DEP_LIBS)
$(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $^ $(ELIBS) $(FF_EXTRALIBS) $(LIBFUZZER_PATH)
tools/target_dem_fuzzer$(EXESUF): tools/target_dem_fuzzer.o $(FF_DEP_LIBS)
$(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $^ $(ELIBS) $(FF_EXTRALIBS) $(LIBFUZZER_PATH)

2
doc/build_system.txt
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@ -48,6 +48,8 @@ config
tools/target_dec_<decoder>_fuzzer
Build fuzzer to fuzz the specified decoder.
tools/target_bsf_<filter>_fuzzer
Build fuzzer to fuzz the specified bitstream filter.
Useful standard make commands:
make -t <target>

3
tools/Makefile
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@ -5,6 +5,9 @@ TOOLS-$(CONFIG_ZLIB) += cws2fws
tools/target_dec_%_fuzzer.o: tools/target_dec_fuzzer.c
$(COMPILE_C) -DFFMPEG_DECODER=$*
tools/target_bsf_%_fuzzer.o: tools/target_bsf_fuzzer.c
$(COMPILE_C) -DFFMPEG_BSF=$*
tools/target_dem_fuzzer.o: tools/target_dem_fuzzer.c
$(COMPILE_C)

153
tools/target_bsf_fuzzer.c Normal file
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@ -0,0 +1,153 @@
/*
* 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
*/
#include "config.h"
#include "libavutil/imgutils.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/bsf.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/internal.h"
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
static void error(const char *err)
{
fprintf(stderr, "%s", err);
exit(1);
}
static AVBitStreamFilter *f = NULL;
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;
AVBSFContext *bsf = NULL;
AVPacket in, out;
uint64_t keyframes = 0;
int res;
if (!f) {
#ifdef FFMPEG_BSF
#define BSF_SYMBOL0(BSF) ff_##BSF##_bsf
#define BSF_SYMBOL(BSF) BSF_SYMBOL0(BSF)
extern AVBitStreamFilter BSF_SYMBOL(FFMPEG_BSF);
f = &BSF_SYMBOL(FFMPEG_BSF);
#else
extern AVBitStreamFilter ff_null_bsf;
f = &ff_null_bsf;
#endif
av_log_set_level(AV_LOG_PANIC);
}
res = av_bsf_alloc(f, &bsf);
if (res < 0)
error("Failed memory allocation");
if (size > 1024) {
GetByteContext gbc;
int extradata_size;
size -= 1024;
bytestream2_init(&gbc, data + size, 1024);
bsf->par_in->width = bytestream2_get_le32(&gbc);
bsf->par_in->height = bytestream2_get_le32(&gbc);
bsf->par_in->bit_rate = bytestream2_get_le64(&gbc);
bsf->par_in->bits_per_coded_sample = bytestream2_get_le32(&gbc);
if (f->codec_ids) {
int i, id;
for (i = 0; f->codec_ids[i] != AV_CODEC_ID_NONE; i++);
id = f->codec_ids[bytestream2_get_byte(&gbc) % i];
bsf->par_in->codec_id = id;
bsf->par_in->codec_tag = bytestream2_get_le32(&gbc);
}
extradata_size = bytestream2_get_le32(&gbc);
bsf->par_in->sample_rate = bytestream2_get_le32(&gbc);
bsf->par_in->channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS;
bsf->par_in->block_align = bytestream2_get_le32(&gbc);
keyframes = bytestream2_get_le64(&gbc);
if (extradata_size < size) {
bsf->par_in->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (bsf->par_in->extradata) {
bsf->par_in->extradata_size = extradata_size;
size -= bsf->par_in->extradata_size;
memcpy(bsf->par_in->extradata, data + size, bsf->par_in->extradata_size);
}
}
if (av_image_check_size(bsf->par_in->width, bsf->par_in->height, 0, bsf))
bsf->par_in->width = bsf->par_in->height = 0;
}
res = av_bsf_init(bsf);
if (res < 0) {
av_bsf_free(&bsf);
return 0; // Failure of av_bsf_init() does not imply that a issue was found
}
av_init_packet(&in);
av_init_packet(&out);
out.data = NULL;
out.size = 0;
while (data < end) {
// 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(&in, data - last);
if (res < 0)
error("Failed memory allocation");
memcpy(in.data, last, data - last);
in.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 (in.size) {
res = av_bsf_send_packet(bsf, &in);
if (res < 0 && res != AVERROR(EAGAIN))
break;
res = av_bsf_receive_packet(bsf, &out);
if (res < 0)
break;
av_packet_unref(&out);
}
av_packet_unref(&in);
}
res = av_bsf_send_packet(bsf, NULL);
while (!res) {
res = av_bsf_receive_packet(bsf, &out);
if (res < 0)
break;
av_packet_unref(&out);
}
av_bsf_free(&bsf);
return 0;
}