c78d8ff4cb
When compiling with GCC 12.2, both `-Warray-bounds` and `-Wstringop-overflow` warnings were triggered in the `prevector::insert` method during CScript prevector operations. GCC incorrectly assumed that operator new could modify the state of class members, leading to false positives during the memmove operation. Following the approach in https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=cca06f0d6d76b0, we introduced local copies for the destination pointer in memmove operations. This prevents GCC from misinterpreting memory manipulation as unsafe. A minimal reproducer triggering this issue in GCC 12.2 and passing in GCC 12.3 can be found at https://godbolt.org/z/8r9TKKoxv. ------- Full error (with changes from the next commit as well): ``` In file included from /ci_container_base/src/script/script.h:11, from /ci_container_base/src/primitives/transaction.h:11, from /ci_container_base/src/primitives/block.h:9, from /ci_container_base/src/kernel/chainparams.h:11, from /ci_container_base/src/kernel/chainparams.cpp:6: In member function ‘void prevector<N, T, Size, Diff>::fill(T*, InputIterator, InputIterator) [with InputIterator = const unsigned char*; unsigned int N = 28; T = unsigned char; Size = unsigned int; Diff = int]’, inlined from ‘void prevector<N, T, Size, Diff>::insert(iterator, InputIterator, InputIterator) [with InputIterator = const unsigned char*; unsigned int N = 28; T = unsigned char; Size = unsigned int; Diff = int]’ at /ci_container_base/src/prevector.h:395:13, inlined from ‘void CScript::AppendData(const prevector<28, unsigned char>::value_type*, size_t)’ at /ci_container_base/src/script/script.h:439:15, inlined from ‘CScript& CScript::operator<<(std::span<const std::byte>)’ at /ci_container_base/src/script/script.h:496:17, inlined from ‘CBlock CreateGenesisBlock(uint32_t, uint32_t, uint32_t, int32_t, const CAmount&)’ at /ci_container_base/src/kernel/chainparams.cpp:76:54: /ci_container_base/src/prevector.h:216:13: error: writing 65 bytes into a region of size 32 [-Werror=stringop-overflow=] 216 | new(static_cast<void*>(dst)) T(*first); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /ci_container_base/src/kernel/chainparams.cpp: In function ‘CBlock CreateGenesisBlock(uint32_t, uint32_t, uint32_t, int32_t, const CAmount&)’: /ci_container_base/src/kernel/chainparams.cpp:76:49: note: destination object ‘<anonymous>’ of size 32 76 | const CScript genesisOutputScript = CScript() << "04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f"_hex << OP_CHECKSIG; | ^ In file included from /usr/lib/gcc/x86_64-w64-mingw32/12-posix/include/c++/cstring:42, from /ci_container_base/src/crypto/common.h:11, from /ci_container_base/src/uint256.h:9, from /ci_container_base/src/consensus/params.h:9, from /ci_container_base/src/kernel/chainparams.h:9: In function ‘void* memmove(void*, const void*, size_t)’, inlined from ‘void prevector<N, T, Size, Diff>::insert(iterator, InputIterator, InputIterator) [with InputIterator = const unsigned char*; unsigned int N = 28; T = unsigned char; Size = unsigned int; Diff = int]’ at /ci_container_base/src/prevector.h:393:16, inlined from ‘void CScript::AppendData(const prevector<28, unsigned char>::value_type*, size_t)’ at /ci_container_base/src/script/script.h:439:15, inlined from ‘CScript& CScript::operator<<(std::span<const std::byte>)’ at /ci_container_base/src/script/script.h:496:17, inlined from ‘CBlock CreateGenesisBlock(uint32_t, uint32_t, uint32_t, int32_t, const CAmount&)’ at /ci_container_base/src/kernel/chainparams.cpp:76:54: /usr/share/mingw-w64/include/string.h:214:33: warning: ‘void* __builtin_memmove(void*, const void*, long long unsigned int)’ offset [65, 35] is out of the bounds [0, 32] of object ‘<anonymous>’ with type ‘CScript’ [-Warray-bounds] 214 | return __builtin___memmove_chk(__dst, __src, __n, __mingw_bos(__dst, 0)); | ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /ci_container_base/src/kernel/chainparams.cpp: In function ‘CBlock CreateGenesisBlock(uint32_t, uint32_t, uint32_t, int32_t, const CAmount&)’: /ci_container_base/src/kernel/chainparams.cpp:76:49: note: ‘<anonymous>’ declared here 76 | const CScript genesisOutputScript = CScript() << "04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f"_hex << OP_CHECKSIG; | ^ ``` Co-authored-by: Hodlinator <172445034+hodlinator@users.noreply.github.com> Co-authored-by: Ryan Ofsky <ryan@ofsky.org>
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 during the generation of the build system) with: ctest. 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.