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unix: use vDSO for getrandom() on linux

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With CL 614835 adding support in the runtime for calling into the
getrandom() vDSO function, wire up x/sys/unix's Getrandom() function to
it, so that callers can benefit from the increased speed and shared
vDSO state with the runtime.

Updates golang/go#69577.

Change-Id: I17734409982c51bb984a6337f4ffa8f60414ebee
Reviewed-on: https://go-review.googlesource.com/c/sys/+/615335
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Jason A. Donenfeld
2024-09-24 03:29:28 +02:00
committed by Jason Donenfeld
parent 48aad76ed3
commit 981de40f5c
4 changed files with 43 additions and 18 deletions
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21
unix/syscall_linux.go
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@@ -2001,7 +2001,26 @@ func Getpgrp() (pid int) {
//sysnb Getpid() (pid int)
//sysnb Getppid() (ppid int)
//sys Getpriority(which int, who int) (prio int, err error)
//sys Getrandom(buf []byte, flags int) (n int, err error)
func Getrandom(buf []byte, flags int) (n int, err error) {
vdsoRet, supported := vgetrandom(buf, uint32(flags))
if supported {
if vdsoRet < 0 {
return 0, errnoErr(syscall.Errno(-vdsoRet))
}
return vdsoRet, nil
}
var p *byte
if len(buf) > 0 {
p = &buf[0]
}
r, _, e := Syscall(SYS_GETRANDOM, uintptr(unsafe.Pointer(p)), uintptr(len(buf)), uintptr(flags))
if e != 0 {
return 0, errnoErr(e)
}
return int(r), nil
}
//sysnb Getrusage(who int, rusage *Rusage) (err error)
//sysnb Getsid(pid int) (sid int, err error)
//sysnb Gettid() (tid int)

12
unix/vgetrandom_linux.go Normal file
View File

@@ -0,0 +1,12 @@
// Copyright 2024 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.
//go:build linux && go1.24
package unix
import _ "unsafe"
//go:linkname vgetrandom runtime.vgetrandom
func vgetrandom(p []byte, flags uint32) (ret int, supported bool)

11
unix/vgetrandom_unsupported.go Normal file
View File

@@ -0,0 +1,11 @@
// Copyright 2024 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.
//go:build !linux || !go1.24
package unix
func vgetrandom(p []byte, flags uint32) (ret int, supported bool) {
return -1, false
}

17
unix/zsyscall_linux.go
View File

@@ -971,23 +971,6 @@ func Getpriority(which int, who int) (prio int, err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Getrandom(buf []byte, flags int) (n int, err error) {
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])
} else {
_p0 = unsafe.Pointer(&_zero)
}
r0, _, e1 := Syscall(SYS_GETRANDOM, uintptr(_p0), uintptr(len(buf)), uintptr(flags))
n = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Getrusage(who int, rusage *Rusage) (err error) {
_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
if e1 != 0 {