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Missing SA_ONSTACK Flag Fix - #23
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September 30, 2026 12:11
alistairking
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Sep 30, 2026
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Description
Ksqueegee agent processes regularly panic with an unrecoverable whole-process memory-corruption fault.
Solution
libscrapli initialises Zig's
std.Io.Threaded, which installs process-wide no-op handlers for SIGPIPE and SIGIO withoutSA_ONSTACK. Go requires every non-Go signal handler to useSA_ONSTACK. When a Go goroutine'swritehits a closed peer (EPIPE — routine for gRPC/HTTP2), the kernel raises SIGPIPE and, lackingSA_ONSTACK, pushes the ~3.4 KB signal frame onto the goroutine's own small stack instead of Go's signal stack. That overflows the stack and overwrites the neighbouring goroutine's memory.The fix is relatively simple, set
SA_ONSTACKon those handlers.