feat: add no_eventfd cfg switch #1683
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This disables the use of `eventfd` on linux for the `Waker` implementation. Instead `pipe` is used as a fallback. Because some SGX runtimes like gramine do not have a secure emulation of the `eventfd` syscall, compiling with `RUSTFLAGS='--cfg no_eventfd'` will produce a more secure SGX application. See also: https://gramine.readthedocs.io/en/stable/manifest-syntax.html#allowing-eventfd Signed-off-by: Harald Hoyer <[email protected]>
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I'm going to do this myself as we likely want a similar flag for #1602, so I'll need to think a bit more about documentation and naming. Thanks for putting in the effort. |
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This disables the use of
eventfdon linux for theWakerimplementation. Insteadpipeis used as a fallback.Because some SGX runtimes like gramine do not have a secure emulation of the
eventfdsyscall, compiling withRUSTFLAGS='--cfg no_eventfd'will produce a more secure SGX application.See also:
https://gramine.readthedocs.io/en/stable/manifest-syntax.html#allowing-eventfd
Resolves: #1682