github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/crypto/sha1/issue15617_test.go (about)

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