898282d620
32a9f13cb805ecf6aebb5cf4e5d92b8a47c4548b wallet: avoid returning a reference to vMasterKey after releasing the mutex that guards it (Vasil Dimov)
Pull request description:
`CWallet::GetEncryptionKey()` would return a reference to the internal
`CWallet::vMasterKey`, guarded by `CWallet::cs_wallet`, which is unsafe.
Returning a copy would be a shorter solution, but could have security
implications of the master key remaining somewhere in the memory even
after `CWallet::Lock()` (the current calls to
`CWallet::GetEncryptionKey()` are safe, but that is not future proof).
So, instead of `EncryptSecret(m_storage.GetEncryptionKey(), ...)`
change the `GetEncryptionKey()` method to provide the encryption
key to a given callback:
`m_storage.WithEncryptionKey([](const CKeyingMaterial& k) { EncryptSecret(k, ...); })`
This silences the following (clang 18):
```
wallet/wallet.cpp:3520:12: error: returning variable 'vMasterKey' by reference requires holding mutex 'cs_wallet' [-Werror,-Wthread-safety-reference-return]
3520 | return vMasterKey;
| ^
```
---
_Previously this PR modified both ArgsManager and wallet code. But the ArgsManager commit
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| depends | ||
| doc | ||
| share | ||
| src | ||
| test | ||
| .cirrus.yml | ||
| .dockerignore | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .python-version | ||
| .style.yapf | ||
| autogen.sh | ||
| CMakeLists.txt | ||
| configure.ac | ||
| CONTRIBUTING.md | ||
| COPYING | ||
| INSTALL.md | ||
| libdashconsensus.pc.in | ||
| Makefile.am | ||
| README.md | ||
| SECURITY.md | ||
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