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OpenBSD 6.4 is going to start requiring that the SP points to memory that was mapped with MAP_STACK on system call entry, traps, and when switching to the alternate signal stack [1]. Currently, Go doesn't map any memory MAP_STACK, so the kernel quickly kills Go processes. Fix this by remapping the memory that backs stack spans with MAP_STACK, and re-remapping it without MAP_STACK when it's returned to the heap. [1] http://openbsd-archive.7691.n7.nabble.com/stack-register-checking-td338238.html Fixes #26142. Change-Id: I656eb84385a22833445d49328bb304f8cdd0e225 Reviewed-on: https://go-review.googlesource.com/121657 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> |
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The Go Programming Language
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