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Mention the systemd issue with old-style callbacks #74

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Apr 24, 2024
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Mention the systemd issue with old-style callbacks #74

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Mention the systemd issue with old-style callbacks
arigo Apr 24, 2024
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arigo Apr 24, 2024
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4 changes: 4 additions & 0 deletions doc/source/using.rst
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Expand Up @@ -891,6 +891,10 @@ ffi.callback() and the result is the same.
- `On Mac OS X,`__ you need to give your application the entitlement
``com.apple.security.cs.allow-unsigned-executable-memory``.

- On Linux, ``systemd`` installs syscall filtering rules on services
it supervises. The `MemoryDenyWriteExecute=` setting in
`systemd.exec(5)` defaults to on, and can quietly block this.

Note also that a cffi fix for this issue was attempted---see
the ``ffi_closure_alloc`` branch---but was not merged because it
creates potential `memory corruption`__ with ``fork()``.
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