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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 family uint16
path [108]byte 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
}

7
src/runtime/os_linux_386.go
View file

@ -1,7 +0,0 @@
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime
func osArchInit() {}

3
src/runtime/os_linux_amd64.go → src/runtime/os_linux_x86.go
View file

@ -2,6 +2,9 @@
// Use of this source code is governed by a BSD-style // Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file. // license that can be found in the LICENSE file.
// +build linux
// +build 386 amd64
package runtime package runtime
//go:noescape //go:noescape

19
src/runtime/sys_linux_386.s
View file

@ -39,6 +39,8 @@
#define SYS_socketcall 102 #define SYS_socketcall 102
#define SYS_setittimer 104 #define SYS_setittimer 104
#define SYS_clone 120 #define SYS_clone 120
#define SYS_uname 122
#define SYS_mlock 150
#define SYS_sched_yield 158 #define SYS_sched_yield 158
#define SYS_nanosleep 162 #define SYS_nanosleep 162
#define SYS_rt_sigreturn 173 #define SYS_rt_sigreturn 173
@ -776,3 +778,20 @@ TEXT runtime·sbrk0(SB),NOSPLIT,$0-4
INVOKE_SYSCALL INVOKE_SYSCALL
MOVL AX, ret+0(FP) MOVL AX, ret+0(FP)
RET RET
// func uname(utsname *new_utsname) int
TEXT ·uname(SB),NOSPLIT,$0-8
MOVL $SYS_uname, AX
MOVL utsname+0(FP), BX
INVOKE_SYSCALL
MOVL AX, ret+4(FP)
RET
// func mlock(addr, len uintptr) int
TEXT ·mlock(SB),NOSPLIT,$0-12
MOVL $SYS_mlock, AX
MOVL addr+0(FP), BX
MOVL len+4(FP), CX
INVOKE_SYSCALL
MOVL AX, ret+8(FP)
RET