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unix: add Getrandom syscall bindings and flags

Browse Source 
This CL introduces the Getrandom syscall. Allowing users of
sufficiently new kernels (3.17) to detect when the operating system
lacks enough entropy to generate cryptographic random data. See:
http://man7.org/linux/man-pages/man2/getrandom.2.html

As we have updated the syscall numbers, the Getrandom function can
just be generated normally. The only other change is to mkerrors.sh
to include the GRND_* flags for getrandom from <linux/random.h>.

It is important to note that currently the mkerrors.sh script cannot
actually be run as it has fallen behind the 4.10 kernel. The GRND_*
flags were added manually.

This was originally part of a larger commit that was split up.
See CL: https://go-review.googlesource.com/37570

Change-Id: I464088a9c9f7224abdcdae476b30a4f2f412d9f5
Reviewed-on: https://go-review.googlesource.com/37589
Reviewed-by: Matt Layher <mdlayher@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Matt Layher <mdlayher@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Joe Richey
2017-02-28 22:35:16 +00:00
committed by Ian Lance Taylor
parent 21f2569f6f
commit 76cc09b634
26 changed files with 233 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
unix/mkerrors.sh
View File

@@ -123,6 +123,7 @@ includes_Linux='
#include <linux/falloc.h>
#include <linux/filter.h>
#include <linux/netlink.h>
#include <linux/random.h>
#include <linux/reboot.h>
#include <linux/rtnetlink.h>
#include <linux/ptrace.h>
@@ -349,6 +350,7 @@ ccflags="$@"
$2 ~ /^CLOCK_/ ||
$2 ~ /^CAN_/ ||
$2 ~ /^ALG_/ ||
$2 ~ /^GRND_/ ||
$2 ~ /^SPLICE_/ ||
$2 !~ "WMESGLEN" &&
$2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}

1
unix/syscall_linux.go
View File

@@ -1038,6 +1038,7 @@ 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)
//sysnb Getrusage(who int, rusage *Rusage) (err error)
//sysnb Getsid(pid int) (sid int, err error)
//sysnb Gettid() (tid int)

2
unix/zerrors_linux_386.go
View File

@@ -437,6 +437,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2

2
unix/zerrors_linux_amd64.go
View File

@@ -437,6 +437,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2

2
unix/zerrors_linux_arm.go
View File

@@ -422,6 +422,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2

2
unix/zerrors_linux_arm64.go
View File

@@ -451,6 +451,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2

2
unix/zerrors_linux_mips.go
View File

@@ -427,6 +427,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2

2
unix/zerrors_linux_mips64.go
View File

@@ -426,6 +426,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
ICANON = 0x2
ICMPV6_FILTER = 0x1

2
unix/zerrors_linux_mips64le.go
View File

@@ -426,6 +426,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
ICANON = 0x2
ICMPV6_FILTER = 0x1

2
unix/zerrors_linux_mipsle.go
View File

@@ -466,6 +466,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2

2
unix/zerrors_linux_ppc64.go
View File

@@ -456,6 +456,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x4000
IBSHIFT = 0x10
ICANON = 0x100

2
unix/zerrors_linux_ppc64le.go
View File

@@ -449,6 +449,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x4000
IBSHIFT = 0x10
ICANON = 0x100

2
unix/zerrors_linux_s390x.go
View File

@@ -462,6 +462,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x2
F_WRLCK = 0x1
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2

2
unix/zerrors_linux_sparc64.go
View File

@@ -470,6 +470,8 @@ const (
F_ULOCK = 0x0
F_UNLCK = 0x3
F_WRLCK = 0x2
GRND_NONBLOCK = 0x1
GRND_RANDOM = 0x2
HUPCL = 0x400
IBSHIFT = 0x10
ICANON = 0x2

17
unix/zsyscall_linux_386.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_amd64.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_arm.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_arm64.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_mips.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_mips64.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_mips64le.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_mipsle.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_ppc64.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_ppc64le.go
View File

@@ -543,6 +543,23 @@ 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 {

17
unix/zsyscall_linux_s390x.go
View File

@@ -543,6 +543,23 @@ 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 {

21
unix/zsyscall_linux_sparc64.go
View File

@@ -1,7 +1,7 @@
// mksyscall.pl syscall_linux.go syscall_linux_sparc64.go
// mksyscall.pl -tags linux,sparc64 syscall_linux.go syscall_linux_sparc64.go
// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
// +build
// +build linux,sparc64
package unix
@@ -543,6 +543,23 @@ 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 {