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262047055d
The docs have been updated. max_len is libfuzzer specific, new way is fuzzer agnostic. Docs: https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/getting_started.md#improving-your-fuzz-target Bug: chromium:895082 Test: flexfec_sender_fuzzer input size still converges at <=200 after running locally for 5-10 minutes. Change-Id: I7a5ce95cb4d8b8ca461f6e502b81b599daa855f9 Reviewed-on: https://webrtc-review.googlesource.com/c/107883 Commit-Queue: Sam Zackrisson <saza@webrtc.org> Reviewed-by: Alex Loiko <aleloi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25361}
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <algorithm>
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#include "modules/rtp_rtcp/include/flexfec_receiver.h"
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#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
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#include "modules/rtp_rtcp/source/byte_io.h"
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#include "modules/rtp_rtcp/source/rtp_packet_received.h"
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namespace webrtc {
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namespace {
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class DummyCallback : public RecoveredPacketReceiver {
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void OnRecoveredPacket(const uint8_t* packet, size_t length) override {}
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};
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} // namespace
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void FuzzOneInput(const uint8_t* data, size_t size) {
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constexpr size_t kMinDataNeeded = 12;
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if (size < kMinDataNeeded || size > 2000) {
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return;
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}
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uint32_t flexfec_ssrc;
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memcpy(&flexfec_ssrc, data + 0, 4);
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uint16_t flexfec_seq_num;
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memcpy(&flexfec_seq_num, data + 4, 2);
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uint32_t media_ssrc;
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memcpy(&media_ssrc, data + 6, 4);
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uint16_t media_seq_num;
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memcpy(&media_seq_num, data + 10, 2);
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DummyCallback callback;
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FlexfecReceiver receiver(flexfec_ssrc, media_ssrc, &callback);
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std::unique_ptr<uint8_t[]> packet;
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size_t packet_length;
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size_t i = kMinDataNeeded;
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while (i < size) {
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packet_length = kRtpHeaderSize + data[i++];
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packet = std::unique_ptr<uint8_t[]>(new uint8_t[packet_length]);
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if (i + packet_length >= size) {
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break;
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}
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memcpy(packet.get(), data + i, packet_length);
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i += packet_length;
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if (i < size && data[i++] % 2 == 0) {
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// Simulate FlexFEC packet.
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ByteWriter<uint16_t>::WriteBigEndian(packet.get() + 2, flexfec_seq_num++);
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ByteWriter<uint32_t>::WriteBigEndian(packet.get() + 8, flexfec_ssrc);
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} else {
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// Simulate media packet.
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ByteWriter<uint16_t>::WriteBigEndian(packet.get() + 2, media_seq_num++);
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ByteWriter<uint32_t>::WriteBigEndian(packet.get() + 8, media_ssrc);
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}
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RtpPacketReceived parsed_packet;
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if (parsed_packet.Parse(packet.get(), packet_length)) {
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receiver.OnRtpPacket(parsed_packet);
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}
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}
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}
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} // namespace webrtc
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