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// 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.
//go:build amd64 && (linux || darwin)
package sha1_test
import (
"crypto/sha1"
"syscall"
"testing"
)
func TestOutOfBoundsRead(t *testing.T) {
const pageSize = 4 << 10
data, err := syscall.Mmap(0, 0, 2*pageSize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
if err != nil {
panic(err)
}
if err := syscall.Mprotect(data[pageSize:], syscall.PROT_NONE); err != nil {
panic(err)
}
for i := 0; i < pageSize; i++ {
sha1.Sum(data[pageSize-i : pageSize])
}
}