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runtime: mlock top of signal stack on both amd64 and 386

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CL 209899 worked around an issue that corrupts vector registers in
recent versions of the Linux kernel by mlocking the top page of every
signal stack on amd64. However, the underlying issue also affects the
XMM registers on 386. This CL applies the mlock fix to both amd64 and
386.

Fixes #35777 (again).

Change-Id: I9886f2dc4c23625421296bd5518d5fd3288bfe48
Reviewed-on: https://go-review.googlesource.com/c/go/+/210345
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Austin Clements 2019-12-08 22:24:10 -05:00
parent daaab44f31
commit 1c8d1f45ba
4 changed files with 33 additions and 7 deletions
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11
src/runtime/defs_linux_386.go
View file

@ -227,3 +227,14 @@ type sockaddr_un struct {
family uint16
path [108]byte
}
const __NEW_UTS_LEN = 64
type new_utsname struct {
sysname [__NEW_UTS_LEN + 1]byte
nodename [__NEW_UTS_LEN + 1]byte
release [__NEW_UTS_LEN + 1]byte
version [__NEW_UTS_LEN + 1]byte
machine [__NEW_UTS_LEN + 1]byte
domainname [__NEW_UTS_LEN + 1]byte
}