github.com/comwrg/go/src@v0.0.0-20220319063731-c238d0440370/crypto/sha1/issue15617_test.go (about)

     1  //go:build amd64 && (linux || darwin)
     2  // +build amd64
     3  // +build linux darwin
     4  
     5  // Copyright 2016 The Go Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  package sha1_test
    10  
    11  import (
    12  	"crypto/sha1"
    13  	"syscall"
    14  	"testing"
    15  )
    16  
    17  func TestOutOfBoundsRead(t *testing.T) {
    18  	const pageSize = 4 << 10
    19  	data, err := syscall.Mmap(0, 0, 2*pageSize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
    20  	if err != nil {
    21  		panic(err)
    22  	}
    23  	if err := syscall.Mprotect(data[pageSize:], syscall.PROT_NONE); err != nil {
    24  		panic(err)
    25  	}
    26  	for i := 0; i < pageSize; i++ {
    27  		sha1.Sum(data[pageSize-i : pageSize])
    28  	}
    29  }