// 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]) } }