mirror of
https://github.com/golang/go
synced 2024-11-23 16:50:06 -07:00
59 lines
964 B
Go
59 lines
964 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2018 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.
|
||
|
|
|
||
|
|
// Issue 26407: ensure that stack variables which have
|
||
|
|
// had their address taken and then used in a comparison,
|
||
|
|
// but are otherwise unused, are cleared.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
poison()
|
||
|
|
test()
|
||
|
|
}
|
||
|
|
|
||
|
|
//go:noinline
|
||
|
|
func poison() {
|
||
|
|
// initialise the stack with invalid pointers
|
||
|
|
var large [256]uintptr
|
||
|
|
for i := range large {
|
||
|
|
large[i] = 1
|
||
|
|
}
|
||
|
|
use(large[:])
|
||
|
|
}
|
||
|
|
|
||
|
|
//go:noinline
|
||
|
|
func test() {
|
||
|
|
a := 2
|
||
|
|
x := &a
|
||
|
|
if x != compare(&x) {
|
||
|
|
panic("not possible")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//go:noinline
|
||
|
|
func compare(x **int) *int {
|
||
|
|
var y *int
|
||
|
|
if x == &y {
|
||
|
|
panic("not possible")
|
||
|
|
}
|
||
|
|
// grow the stack to trigger a check for invalid pointers
|
||
|
|
grow()
|
||
|
|
if x == &y {
|
||
|
|
panic("not possible")
|
||
|
|
}
|
||
|
|
return *x
|
||
|
|
}
|
||
|
|
|
||
|
|
//go:noinline
|
||
|
|
func grow() {
|
||
|
|
var large [1 << 16]uintptr
|
||
|
|
use(large[:])
|
||
|
|
}
|
||
|
|
|
||
|
|
//go:noinline
|
||
|
|
func use(_ []uintptr) { }
|