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test: make issue8606b test more robust
Use actual unmapped memory instead of small integers to make pointers that will fault when accessed. Fixes #49562 Change-Id: I2c60c97cf80494dd962a07d10cfeaff6a00f4f8e Reviewed-on: https://go-review.googlesource.com/c/go/+/364914 Trust: Keith Randall <khr@golang.org> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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@ -1,4 +1,5 @@
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// run
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// +build linux darwin
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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@ -20,20 +21,10 @@ package main
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import (
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"fmt"
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"reflect"
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"syscall"
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"unsafe"
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)
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func bad1() string {
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s := "foo"
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(*reflect.StringHeader)(unsafe.Pointer(&s)).Data = 1 // write bad value to data ptr
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return s
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}
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func bad2() string {
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s := "foo"
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(*reflect.StringHeader)(unsafe.Pointer(&s)).Data = 2 // write bad value to data ptr
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return s
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}
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type SI struct {
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s string
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i int
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@ -45,15 +36,31 @@ type SS struct {
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}
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func main() {
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bad1 := "foo"
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bad2 := "foo"
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p := syscall.Getpagesize()
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b, err := syscall.Mmap(-1, 0, p, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
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if err != nil {
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panic(err)
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}
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err = syscall.Mprotect(b, syscall.PROT_NONE)
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if err != nil {
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panic(err)
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}
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// write inaccessible pointers as the data fields of bad1 and bad2.
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(*reflect.StringHeader)(unsafe.Pointer(&bad1)).Data = uintptr(unsafe.Pointer(&b[0]))
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(*reflect.StringHeader)(unsafe.Pointer(&bad2)).Data = uintptr(unsafe.Pointer(&b[1]))
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for _, test := range []struct {
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a, b interface{}
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}{
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{SI{s: bad1(), i: 1}, SI{s: bad2(), i: 2}},
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{SS{s: bad1(), t: "a"}, SS{s: bad2(), t: "aa"}},
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{SS{s: "a", t: bad1()}, SS{s: "b", t: bad2()}},
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{SI{s: bad1, i: 1}, SI{s: bad2, i: 2}},
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{SS{s: bad1, t: "a"}, SS{s: bad2, t: "aa"}},
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{SS{s: "a", t: bad1}, SS{s: "b", t: bad2}},
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// This one would panic because the length of both strings match, and we check
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// the body of the bad strings before the body of the good strings.
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//{SS{s: bad1(), t: "a"}, SS{s: bad2(), t: "b"}},
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//{SS{s: bad1, t: "a"}, SS{s: bad2, t: "b"}},
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} {
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if test.a == test.b {
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panic(fmt.Sprintf("values %#v and %#v should not be equal", test.a, test.b))
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