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Source file src/crypto/sha1/issue15617_test.go

Documentation: crypto/sha1

  // +build amd64
  // +build linux darwin
  
  // 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.
  
  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])
  	}
  }
  

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