[FFmpeg-cvslog] tools: add target_enc_fuzzer.c
Michael Niedermayer
git at videolan.org
Wed Apr 24 03:55:27 EEST 2024
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Apr 20 02:51:53 2024 +0200| [fb4a1eaadfbf1c212716d4608d5ef2a1833b6c12] | committer: Michael Niedermayer
tools: add target_enc_fuzzer.c
Sponsored-by: Sovereign Tech Fund
Reviewed-by: James Almer <jamrial at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fb4a1eaadfbf1c212716d4608d5ef2a1833b6c12
---
Makefile | 3 +
tools/Makefile | 3 +
tools/target_enc_fuzzer.c | 203 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 209 insertions(+)
diff --git a/Makefile b/Makefile
index b309dbc4db..de727cbe00 100644
--- a/Makefile
+++ b/Makefile
@@ -52,6 +52,9 @@ $(TOOLS): %$(EXESUF): %.o
target_dec_%_fuzzer$(EXESUF): target_dec_%_fuzzer.o $(FF_DEP_LIBS)
$(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $^ $(ELIBS) $(FF_EXTRALIBS) $(LIBFUZZER_PATH)
+target_enc_%_fuzzer$(EXESUF): target_enc_%_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) $(LIBFUZZER_PATH)
diff --git a/tools/Makefile b/tools/Makefile
index 72e8e709a8..2a11fa0ae6 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -5,6 +5,9 @@ TOOLS-$(CONFIG_ZLIB) += cws2fws
tools/target_dec_%_fuzzer.o: tools/target_dec_fuzzer.c
$(COMPILE_C) -DFFMPEG_DECODER=$*
+tools/target_enc_%_fuzzer.o: tools/target_enc_fuzzer.c
+ $(COMPILE_C) -DFFMPEG_ENCODER=$*
+
tools/target_bsf_%_fuzzer.o: tools/target_bsf_fuzzer.c
$(COMPILE_C) -DFFMPEG_BSF=$*
diff --git a/tools/target_enc_fuzzer.c b/tools/target_enc_fuzzer.c
new file mode 100644
index 0000000000..4357d37636
--- /dev/null
+++ b/tools/target_enc_fuzzer.c
@@ -0,0 +1,203 @@
+/*
+ * Copyright (c) 2024 Michael Niedermayer <michael-ffmpeg at niedermayer.cc>
+ *
+ * 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
+ *
+ * Based on target_dec_fuzzer
+ */
+
+#include "config.h"
+#include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/cpu.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
+
+#include "libavcodec/avcodec.h"
+#include "libavcodec/bytestream.h"
+#include "libavcodec/codec_internal.h"
+#include "libavformat/avformat.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
+
+extern const FFCodec * codec_list[];
+
+static void error(const char *err)
+{
+ fprintf(stderr, "%s", err);
+ exit(1);
+}
+
+static const FFCodec *c = NULL;
+
+// Ensure we don't loop forever
+const uint32_t maxiteration = 8096;
+
+
+static int encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt)
+{
+ int ret;
+
+ ret = avcodec_send_frame(enc_ctx, frame);
+ if (ret < 0)
+ return ret;
+
+ while (ret >= 0) {
+ ret = avcodec_receive_packet(enc_ctx, pkt);
+ if (ret == AVERROR(EAGAIN)) {
+ return 0;
+ } else if (ret < 0) {
+ return ret;
+ }
+
+ av_packet_unref(pkt);
+ }
+ av_assert0(0);
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+ uint64_t maxpixels_per_frame = 512 * 512;
+ uint64_t maxpixels;
+
+ const uint8_t *end = data + size;
+ uint32_t it = 0;
+ uint64_t nb_samples = 0;
+ AVDictionary *opts = NULL;
+
+ if (!c) {
+#define ENCODER_SYMBOL0(CODEC) ff_##CODEC##_encoder
+#define ENCODER_SYMBOL(CODEC) ENCODER_SYMBOL0(CODEC)
+ extern FFCodec ENCODER_SYMBOL(FFMPEG_ENCODER);
+ codec_list[0] = &ENCODER_SYMBOL(FFMPEG_ENCODER);
+
+ c = &ENCODER_SYMBOL(FFMPEG_ENCODER);
+ av_log_set_level(AV_LOG_PANIC);
+ }
+
+ av_assert0(c->p.type == AVMEDIA_TYPE_VIDEO);
+
+ maxpixels = maxpixels_per_frame * maxiteration;
+
+ maxpixels_per_frame = FFMIN(maxpixels_per_frame , maxpixels);
+
+ AVCodecContext* ctx = avcodec_alloc_context3(&c->p);
+ if (!ctx)
+ 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->pix_fmt = AV_PIX_FMT_YUV420P;
+ if (size > 1024) {
+ GetByteContext gbc;
+ int flags;
+ int64_t flags64;
+
+ size -= 1024;
+ bytestream2_init(&gbc, data + size, 1024);
+ ctx->width = bytestream2_get_le32(&gbc) & 0xFFFF;
+ ctx->height = bytestream2_get_le32(&gbc) & 0xFFFF;
+ ctx->bit_rate = bytestream2_get_le64(&gbc);
+ ctx->gop_size = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
+ ctx->max_b_frames = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
+ ctx->time_base.num = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
+ ctx->time_base.den = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
+ ctx->framerate.num = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
+ ctx->framerate.den = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
+
+ flags = bytestream2_get_byte(&gbc);
+ if (flags & 2)
+ ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
+
+ if (flags & 0x40)
+ av_force_cpu_flags(0);
+
+ flags64 = bytestream2_get_le64(&gbc);
+
+ int npixfmts = 0;
+ while (c->p.pix_fmts[npixfmts++] != AV_PIX_FMT_NONE)
+ ;
+ ctx->pix_fmt = c->p.pix_fmts[bytestream2_get_byte(&gbc) % npixfmts];
+
+ switch (c->p.id) {
+ case AV_CODEC_ID_FFV1:{
+ int coder = bytestream2_get_byte(&gbc)&3;
+ if (coder == 3) coder = -2;
+ av_dict_set_int(&opts, "coder", coder, 0);
+ av_dict_set_int(&opts, "context", bytestream2_get_byte(&gbc)&1, 0);
+ av_dict_set_int(&opts, "slicecrc", bytestream2_get_byte(&gbc)&1, 0);
+ break;}
+ }
+ }
+ if (ctx->width == 0 || av_image_check_size(ctx->width, ctx->height, 0, ctx))
+ ctx->width = ctx->height = 64;
+
+ int res = avcodec_open2(ctx, &c->p, &opts);
+ if (res < 0) {
+ avcodec_free_context(&ctx);
+ av_dict_free(&opts);
+ return 0; // Failure of avcodec_open2() does not imply that a issue was found
+ }
+
+
+ AVFrame *frame = av_frame_alloc();
+ AVPacket *avpkt = av_packet_alloc();
+ if (!frame || !avpkt)
+ error("Failed memory allocation");
+
+ frame->format = ctx->pix_fmt;
+ frame->width = ctx->width;
+ frame->height = ctx->height;
+
+ while (data < end && it < maxiteration) {
+ res = av_frame_get_buffer(frame, 0);
+ if (res < 0)
+ error("Failed av_frame_get_buffer");
+
+ for (int i=0; i<FF_ARRAY_ELEMS(frame->buf); i++) {
+ if (frame->buf[i]) {
+ int buf_size = FFMIN(end-data, frame->buf[i]->size);
+ memcpy(frame->buf[i]->data, data, buf_size);
+ memset(frame->buf[i]->data + buf_size, 0, frame->buf[i]->size - buf_size);
+ data += buf_size;
+ }
+ }
+
+ frame->pts = nb_samples;
+
+ res = encode(ctx, frame, avpkt);
+ if (res < 0)
+ break;
+ it++;
+ for (int i=0; i<FF_ARRAY_ELEMS(frame->buf); i++)
+ av_buffer_unref(&frame->buf[i]);
+
+ av_packet_unref(avpkt);
+ }
+
+ encode(ctx, NULL, avpkt);
+ av_packet_unref(avpkt);
+
+// fprintf(stderr, "frames encoded: %"PRId64", iterations: %d\n", nb_samples , it);
+
+ av_frame_free(&frame);
+ avcodec_free_context(&ctx);
+ av_packet_free(&avpkt);
+ av_dict_free(&opts);
+ return 0;
+}
More information about the ffmpeg-cvslog
mailing list