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Merge bitcoin/bitcoin#28340: security: restrict abis in bitcoind.service

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0244416aac security: restrict abis in bitcoind.service (Charlie)

Pull request description:

  [As noted here](https://www.freedesktop.org/software/systemd/man/systemd.exec.html#MemoryDenyWriteExecute=), it's a good idea to pair `MemoryDenyWriteExecute=true` with `SystemCallArchitectures=native` because `MemoryDenyWriteExecute` can be circumvented in some operating systems which support multiple ABIs like x86/x86-64.
  This helps restrict the possible application binary interfaces (ABIs) that can be used when running bitcoind through systemd, reducing the attack surface area.

ACKs for top commit:
  laanwj:
    ACK 0244416aac . This is a sensible security feature.
  0xB10C:
    ACK 0244416aac

Tree-SHA512: 77a35b0674d8d67d857cd20ae1b8cd011f82d6f5ed21bc106cbe45bfa937e786ddc1bf7261e3bdb8c289df1224e91658760905d2c8f37cc4c6506ef8037ad158
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Ryan Ofsky 2024-04-17 12:59:37 -04:00
commit dbd2000b34
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contrib/init/bitcoind.service
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@ -81,5 +81,8 @@ PrivateDevices=true
# Deny the creation of writable and executable memory mappings.
MemoryDenyWriteExecute=true
# Restrict ABIs to help ensure MemoryDenyWriteExecute is enforced
SystemCallArchitectures=native
[Install]
WantedBy=multi-user.target