commit | 20160b37c6b7d12e25987baf2d95ba861b327a3b | [log] [tgz] |
---|---|---|
author | Joel Sing <joel@sing.id.au> | Wed May 20 02:13:57 2020 +1000 |
committer | Joel Sing <joel@sing.id.au> | Tue May 26 17:02:46 2020 +0000 |
tree | 0aa3c324148f930bca7e41ec1d55d06b5bd84cea | |
parent | bcda68447b31b86bc3829fca80454ca1a2a572e0 [diff] |
runtime, syscall: correct openbsd/arm and openbsd/arm64 syscalls for OpenBSD 6.7 Add two no op instructions following svc on openbsd/arm64 and swi on openbsd/arm. All except some of the most recent arm64 processors have a speculative execution flaw that occurs across a syscall boundary, which cannot be mitigated in the kernel. In order to protect against this leak a speculation barrier needs to be placed after an svc or swi instruction. In order to avoid the performance impact of these instructions, the OpenBSD 6.7 kernel returns execution two instructions past the svc or swi call. For now two hardware no ops are added, which allows syscalls to work with both 6.6 and 6.7. These should be replaced with real speculation barriers once OpenBSD 6.8 is released. Updates #36435 Change-Id: I06153cb0998199242cca8761450e53599c3e7de4 Reviewed-on: https://go-review.googlesource.com/c/go/+/234381 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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