mirror of
https://github.com/golang/go
synced 2024-11-23 23:00:03 -07:00
0c54225b51
The recent linker changes broke NaCl support a month ago, and there are no known users of it. The NaCl code can always be recovered from the repository history. R=adg, r CC=golang-dev https://golang.org/cl/3671042
35 lines
1.1 KiB
Go
35 lines
1.1 KiB
Go
// $G $D/$F.go && $L $F.$A &&
|
|
// ((! sh -c ./$A.out) >/dev/null 2>&1 || echo BUG: should fail)
|
|
|
|
// Copyright 2009 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 "unsafe"
|
|
|
|
var dummy [512<<20]byte // give us a big address space
|
|
var q *[1<<30]byte
|
|
func main() {
|
|
// the test only tests what we intend to test
|
|
// if dummy starts in the first 256 MB of memory.
|
|
// otherwise there might not be anything mapped
|
|
// at the address that might be accidentally
|
|
// dereferenced below.
|
|
if uintptr(unsafe.Pointer(&dummy)) > 256<<20 {
|
|
panic("dummy too far out")
|
|
}
|
|
|
|
// The problem here is that indexing into p[] with a large
|
|
// enough index can jump out of the unmapped section
|
|
// at the beginning of memory and into valid memory.
|
|
//
|
|
// To avoid needing a check on every slice beyond the
|
|
// usual len and cap, we require the *array -> slice
|
|
// conversion to do the check.
|
|
var x []byte
|
|
var y = &x
|
|
*y = q[0:] // should crash (uses arraytoslice runtime routine)
|
|
}
|