/usr/share/go-1.8/test/fixedbugs/issue15002.go is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | // run
// +build amd64
// +build linux darwin
// Copyright 2016 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 main
import (
"fmt"
"syscall"
)
// Use global variables so the compiler
// doesn't know that they are constants.
var p = syscall.Getpagesize()
var zero = 0
var one = 1
func main() {
// Allocate 2 pages of memory.
b, err := syscall.Mmap(-1, 0, 2*p, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
if err != nil {
panic(err)
}
// Mark the second page as faulting.
err = syscall.Mprotect(b[p:], syscall.PROT_NONE)
if err != nil {
panic(err)
}
// Get a slice pointing to the last byte of the good page.
x := b[p-one : p]
test16(x)
test16i(x, 0)
test32(x)
test32i(x, 0)
test64(x)
test64i(x, 0)
}
func test16(x []byte) uint16 {
defer func() {
r := recover()
if r == nil {
panic("no fault or bounds check failure happened")
}
s := fmt.Sprintf("%s", r)
if s != "runtime error: index out of range" {
panic("bad panic: " + s)
}
}()
// Try to read 2 bytes from x.
return uint16(x[0]) | uint16(x[1])<<8
// We expect to get an "index out of range" error from x[1].
// If we promote the first load to a 2-byte load, it will segfault, which we don't want.
}
func test16i(x []byte, i int) uint16 {
defer func() {
r := recover()
if r == nil {
panic("no fault or bounds check failure happened")
}
s := fmt.Sprintf("%s", r)
if s != "runtime error: index out of range" {
panic("bad panic: " + s)
}
}()
return uint16(x[i]) | uint16(x[i+1])<<8
}
func test32(x []byte) uint32 {
defer func() {
r := recover()
if r == nil {
panic("no fault or bounds check failure happened")
}
s := fmt.Sprintf("%s", r)
if s != "runtime error: index out of range" {
panic("bad panic: " + s)
}
}()
return uint32(x[0]) | uint32(x[1])<<8 | uint32(x[2])<<16 | uint32(x[3])<<24
}
func test32i(x []byte, i int) uint32 {
defer func() {
r := recover()
if r == nil {
panic("no fault or bounds check failure happened")
}
s := fmt.Sprintf("%s", r)
if s != "runtime error: index out of range" {
panic("bad panic: " + s)
}
}()
return uint32(x[i]) | uint32(x[i+1])<<8 | uint32(x[i+2])<<16 | uint32(x[i+3])<<24
}
func test64(x []byte) uint64 {
defer func() {
r := recover()
if r == nil {
panic("no fault or bounds check failure happened")
}
s := fmt.Sprintf("%s", r)
if s != "runtime error: index out of range" {
panic("bad panic: " + s)
}
}()
return uint64(x[0]) | uint64(x[1])<<8 | uint64(x[2])<<16 | uint64(x[3])<<24 |
uint64(x[4])<<32 | uint64(x[5])<<40 | uint64(x[6])<<48 | uint64(x[7])<<56
}
func test64i(x []byte, i int) uint64 {
defer func() {
r := recover()
if r == nil {
panic("no fault or bounds check failure happened")
}
s := fmt.Sprintf("%s", r)
if s != "runtime error: index out of range" {
panic("bad panic: " + s)
}
}()
return uint64(x[i+0]) | uint64(x[i+1])<<8 | uint64(x[i+2])<<16 | uint64(x[i+3])<<24 |
uint64(x[i+4])<<32 | uint64(x[i+5])<<40 | uint64(x[i+6])<<48 | uint64(x[i+7])<<56
}
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