255004fc5e
9f265d88253ed464413dea5614fa13dea0d8cfd5 fuzz: Detect deadlocks in process_message (dergoegge) fae1e7e012571201fd51c547ba4fb6044be9aeb5 fuzz: p2p: Detect peer deadlocks (MarcoFalke) Pull request description: It may be possible that a peer connection will deadlock, due to software bugs such as https://github.com/bitcoin/bitcoin/pull/18808. Fix this by detecting them in the fuzz target. Can be tested by introducing a bug such as: ```diff diff --git a/src/net_processing.cpp b/src/net_processing.cpp index 1067341495..97495a13df 100644 --- a/src/net_processing.cpp +++ b/src/net_processing.cpp @@ -2436,3 +2436,3 @@ void PeerManagerImpl::ProcessGetData(CNode& pfrom, Peer& peer, const std::atomic if (it != peer.m_getdata_requests.end() && !pfrom.fPauseSend) { - const CInv &inv = *it++; + const CInv& inv = *it; if (inv.IsGenBlkMsg()) { ``` Using a fuzz input such as: ``` $ base64 ./timeout-ada0fecaba2b8c46c6e970cf637d9625b01bf7e5 kNptdNbW1tbWYghvXIpwb25vPQAA////////cwAjLv8AXAB2ZXJhY2sAQW5v/62tra3Pz/////// //////////////////////9c8GZpbHRlcmxvYWQAAAEAAwAAAABVYwC2XABmaWx0ZXJhZGQAAAAX Fxdn/////2V0F861tcqvEmAAACEAAABjYXB0dXJldmUAAH4AgAA1PNfX11x0Z2V0ZGF0YQBDACOw AQMAAAAGIm5GERoLWcqvEmBD61u/KMNPOl4zKh/HKLK3PPGIkQ9eE/////////8AAAAAAAAAAFtb WyjDTzpeMSofx7K3PNfX11x0Z2V0ZGF0YQBDACMwAQMAAAAGIm5GERoLWcqvEmBD61u/KMNPOl4z Kh/Hsrc88YiRD2/Nzc3Nzc3Nzc3NTc3Nzc3Nzc3Nzc3Nzc3Nzc3Nzc3Nzc3Nzc3Nzc3Nzc3Nzc3N zWWj1NTUudTU1NTU1P///0j+P/9cdHR4AAAAAAAAy/4AAHR4AAAAAAAAP8v+AAD/+P////////// AX55bJl8HWnz/////wAgXGF0YVPxY2RkAAAA ``` And running the fuzz target: ``` $ FUZZ=process_messages ./src/test/fuzz/fuzz -runs=1 -timeout=18 ./timeout-ada0fecaba2b8c46c6e970cf637d9625b01bf7e5 INFO: Running with entropic power schedule (0xFF, 100). INFO: Seed: 3436516708 INFO: Loaded 1 modules (390807 inline 8-bit counters): 390807 [0x55d0d6221e80, 0x55d0d6281517), INFO: Loaded 1 PC tables (390807 PCs): 390807 [0x55d0d6281518,0x55d0d6877e88), ./src/test/fuzz/fuzz: Running 1 inputs 1 time(s) each. Running: ./timeout-ada0fecaba2b8c46c6e970cf637d9625b01bf7e5 ALARM: working on the last Unit for 19 seconds and the timeout value is 18 (use -timeout=N to change) ==375014== ERROR: libFuzzer: timeout after 19 seconds ``` ACKs for top commit: naumenkogs: ACK 9f265d88253ed464413dea5614fa13dea0d8cfd5 dergoegge: ACK 9f265d88253ed464413dea5614fa13dea0d8cfd5 brunoerg: ACK 9f265d88253ed464413dea5614fa13dea0d8cfd5 Tree-SHA512: da83ff90962bb679aae00e8e9dba639c180b7aaba544e0c4d0978d36e28a9ff1cd7a2e13009d8ab407ef57767656aca1ebc767a7d2f1bc880284f8f57c197a50
Bitcoin Core integration/staging tree
For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.
What is Bitcoin Core?
Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.
Further information about Bitcoin Core is available in the doc folder.
License
Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.
Development Process
The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be
completely stable. Tags are created
regularly from release branches to indicate new official, stable release versions of Bitcoin Core.
The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.
The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.
Testing
Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.
Automated Testing
Developers are strongly encouraged to write unit tests for new code, and to
submit new unit tests for old code. Unit tests can be compiled and run
(assuming they weren't disabled in configure) with: make check. Further details on running
and extending unit tests can be found in /src/test/README.md.
There are also regression and integration tests, written
in Python.
These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py
The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.
Manual Quality Assurance (QA) Testing
Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.
Translations
Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.
Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.
Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.