fix: plugin verification panics due to missing SA_ONSTACK signal

[YOU54F]

fixes #269

yak shave and a half, bit of a write up and repro in the pact reference repo

pact-foundation/pact-reference@master...YOU54F:pact-reference:issue/go_signals

tried building the ffi and csv plugin with musl 1.25, as 1.24 has a fix in it, similar to that referenced by Jason in the original issue for glibc.

that didnt seem to solve the issue for me

we cant move to that new a version of glibc as we need to be compatible with older distroes, and i haven’t tested that out to see if it works.

some links from the yak shave

cgo onstack failures

• https://github.com/wailsapp/wails/pull/2152/files#diff-d4a0fa73df7b0ab971e550f95249e358b634836e925ace96f7400480916ac09e
• cmd/go: Segfault on ppc64le during Go 1.18 build on Alpine Linux golang/go#51787
• https://www.openwall.com/lists/musl/2020/08/09/1
• https://www.openwall.com/lists/musl/2019/03/05/2
• https://github.com/cross-rs/cross/tree/v0.2.5
• runtime: musl libc setxid/setgroups signals clobber stacks / do not use SA_ONSTACK golang/go#39857
• cmd/link: regression for supporting PIE on Alpine X86_64 platform golang/go#18243
• x/build: get Alpine builders passing golang/go#19938
• https://groups.google.com/g/golang-nuts/c/lkpXBefIF1U

FYI https://git.musl-libc.org/cgit/musl/commit/?id=2e5fff43dd7fc808197744c67cca7908ac19bb4f switched musl to using the alt stack for internal signals and will be present in future releases starting with 1.2.4.

• https://github.com/rust-lang/rust/blob/cb93f92b84d34f4e84748848690359a54ed14df7/src/ci/docker/scripts/musl-toolchain.sh
• Upgrade *-linux-musl targets to musl 1.2 rust-lang/compiler-team#572
• bump musl to 1.2.3, like done in rust 1.71 cross-rs/cross#1346

note to self - if we can get this fix applied to purego project as well that would be ace, if not maybe adding the function into the pact_ffi lib so it could be called whether we are using cgo or not 🤔

[coveralls]

coverage: 29.134% (+0.08%) from 29.056%
when pulling e41f22b on YOU54F:fix/issue_269_sa_onstack_flag
into 061aaf9 on pact-foundation:master.

[mefellows]

Wow! Fantastic work Yousaf 👏

I'll do a bit more reading on what you've shared, but for now I'll merge and assume your fix is good (as the build passed)!

[YOU54F]

Cheers dude!

I'm fairly confident, I've managed to get CI working cross platform with cgo and purego.

cgo - https://github.com/YOU54F/pact-go/actions/runs/9727163895

purego - https://github.com/YOU54F/pact-go/actions/runs/9735707695/job/26865256432

Getting a clean sheet in windows with cgo has two more yak shaves, being able to shutdown plugins properly, and a failing message test but going to be in a far better place :)