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Preserve Unix signal dispositions when probing handlers - #8961
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughOn Unix, ChangesSignal Handler Probe
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to This change makes Unix signal probing read-only, which removes a window in which signals could be discarded. No merge-blocking risk was identified. Security Architecture ReviewSecurity architecture risk: ⚪ Minimal · up to Unix signal inspection no longer temporarily changes handlers or risks discarding signals. The caller’s ownership restrictions and error handling remain intact, and Windows behavior is unchanged. No material security risk introduced or worsened by this change was identified. Retained concerns Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Merging this PR will not alter performance
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@youknowone can we merge since it has already been approved? |
fanninpm
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fanninpm
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I've got a few questions.
| #[cfg(test)] | ||
| #[cfg(unix)] | ||
| mod tests { | ||
| #[test] | ||
| fn probing_preserves_signal_flags_and_mask() { |
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Is this the best way to order these attributes?
| unsafe { | ||
| let mut action: libc::sigaction = core::mem::zeroed(); | ||
| action.sa_sigaction = handler as *const () as libc::sighandler_t; | ||
| action.sa_flags = libc::SA_NODEFER; | ||
| assert_eq!(libc::sigemptyset(&mut action.sa_mask), 0); | ||
| assert_eq!(libc::sigaddset(&mut action.sa_mask, libc::SIGUSR1), 0); | ||
| let mut original = core::mem::MaybeUninit::uninit(); | ||
| assert_eq!( | ||
| libc::sigaction(libc::SIGUSR2, &action, original.as_mut_ptr()), | ||
| 0 | ||
| ); | ||
| let _restore = Restore(original.assume_init()); | ||
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| assert_eq!( | ||
| super::probe_handler(libc::SIGUSR2), | ||
| Some(action.sa_sigaction) | ||
| ); | ||
| let mut observed = core::mem::MaybeUninit::<libc::sigaction>::uninit(); | ||
| assert_eq!( | ||
| libc::sigaction(libc::SIGUSR2, core::ptr::null(), observed.as_mut_ptr()), | ||
| 0 | ||
| ); | ||
| let observed = observed.assume_init(); | ||
| assert_eq!(observed.sa_sigaction, action.sa_sigaction); | ||
| assert_ne!(observed.sa_flags & libc::SA_NODEFER, 0); | ||
| assert_eq!(libc::sigismember(&observed.sa_mask, libc::SIGUSR1), 1); | ||
| } |
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Does this unsafe block need to be this long?
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this is test. simple test is better than perfect test
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3 participants
Summary
Read Unix signal dispositions with
sigactionwithout temporarily installingSIG_IGN. This preserves handler flags and masks and avoids a window in which signals can be discarded.Extracted from #8944 as an independent fix.
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Written with Codex (GPT-6), reviewed by a human before submission.
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