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MarcoFalke b763ae02a6
Merge #16878: Fix non-deterministic coverage of test DoS_mapOrphans 
4455949d6f Make test DoS_mapOrphans deterministic (David Reikher)

Pull request description:

  This pull request proposes a solution to make the test `DoS_mapOrphans` in denialofservice_tests.cpp have deterministic coverage.

  The `RandomOrphan` function in denialofservice_tests.cpp and the implicitly called function `ecdsa_signature_parse_der_lax` in pubkey.cpp were causing the non-deterministic test coverage.

  In the former, if a random orphan was selected the index of which is bigger than the max. orphan index in `mapOrphanTransactions`, the last orphan was returned from `RandomOrphan`. If the random number generated was never large enough, this condition would not be fulfilled and the corresponding branch wouldn't run. The proposed solution is to force one of the 50 dependant orphans to depend on the last orphan in `mapOrphanTransactions` using the newly introduced function `OrphanByIndex` (and passing it a large uint256), forcing this branch to run at least once.

  In the latter, if values for ECDSA `R` or `S` (or both) had no leading zeros, some code would not be executed. The solution was to find a constant signature that would be comprised of `R` and `S` values with leading zeros and calling `CPubKey::Verify` at the end of the test with this signature forcing this code to always run at least once at the end even if it hadn't throughout the test.

  To test that the coverage is (at least highly likely) deterministic, I ran

  `contrib/devtools/test_deterministic_coverage.sh denialofservice_tests/DoS_mapOrphans 1000`

  and the result was deterministic coverage across 1000 runs.

  Also - removed denialofservice_tests test entry from the list of non-deterministic tests in the coverage script.

ACKs for top commit:
  MarcoFalke:
    ACK 4455949d6f

Tree-SHA512: 987eb1f94b80d5bec4d4944e91ef43b9b8603055750362d4b4665b7f011be27045808aa9f4c6ccf8ae009b61405f9a1b8671d65a843c3328e5b8acce1f1c00a6
2020-07-21 09:38:39 +02:00
.github doc: Add redirect for GUI issues and pull requests 2020-06-08 10:06:02 -04:00
.tx tx: Bump transifex slug to 020x 2020-03-16 10:52:55 +01:00
build_msvc Updates msvc build to use ISO standard C++17. 2020-07-04 16:03:18 +01:00
build-aux/m4 Merge #18297: build: Use pkg-config in BITCOIN_QT_CONFIGURE for all hosts including Windows 2020-06-13 15:41:39 +08:00
ci ci: add tsan debug symbols option 2020-07-17 12:14:41 +03:00
contrib Make test DoS_mapOrphans deterministic 2020-07-21 09:18:57 +03:00
depends doc: Update macOS cross compilation dependencies for Focal 2020-07-18 18:05:40 +03:00
doc Merge #16525: Dump transaction version as an unsigned integer in RPC/TxToUniv 2020-07-16 21:38:09 +02:00
share doc: Use precise permission flags where possible 2020-07-10 15:37:42 +02:00
src Merge #16878: Fix non-deterministic coverage of test DoS_mapOrphans 2020-07-21 09:38:39 +02:00
test Merge #19538: ci: Add tsan suppression for race in DatabaseBatch 2020-07-17 17:02:41 +02:00
.appveyor.yml Remove cached directories and associated script blocks from appveyor CI configuration. 2020-07-04 13:43:18 +01:00
.cirrus.yml ci: Run tsan ci config on cirrus 2020-07-02 12:22:39 -04:00
.fuzzbuzz.yml ci: Add fuzzbuzz integration 2020-04-14 16:38:26 +00:00
.gitattributes Separate protocol versioning from clientversion 2014-10-29 00:24:40 -04:00
.gitignore This PR adds initial support for type hints checking in python scripts. 2020-06-02 08:03:02 +02:00
.python-version .python-version: Specify full version 3.5.6 2019-03-02 12:06:26 -05:00
.style.yapf test: .style.yapf: Set column_limit=160 2019-03-04 18:28:13 -05:00
.travis.yml ci: Drop Homebrew caching while using Homebrew addon on Travis 2020-07-14 02:35:02 +03:00
autogen.sh scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
configure.ac build: fix -Wformat-security check when compiling with GCC 2020-07-15 17:50:01 +08:00
CONTRIBUTING.md doc: CONTRIBUTING.md improvements 2020-07-12 07:52:28 +02:00
COPYING doc: Update license year range to 2020 2019-12-26 23:11:21 +01:00
INSTALL.md Update INSTALL landing redirection notice for build instructions. 2016-10-06 12:27:23 +13:00
libbitcoinconsensus.pc.in build: remove libcrypto as internal dependency in libbitcoinconsensus.pc 2019-11-19 15:03:44 +01:00
Makefile.am tests: run test-security-check.py in CI 2020-06-16 19:52:30 +08:00
README.md doc: Mention repo split in the READMEs 2020-06-08 10:06:14 -04:00
SECURITY.md doc: Remove explicit mention of version from SECURITY.md 2019-06-14 06:39:17 -04:00

README.md

Bitcoin Core integration/staging tree

https://bitcoincore.org

What is Bitcoin?

Bitcoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.

For more information, as well as an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/, or read the original whitepaper.

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, that are run automatically on the build server. These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py

The Travis CI system makes 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.

Translators should also subscribe to the mailing list.