Source file src/crypto/sha1/issue15617_test.go

     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/internal/cryptotest"
    11  	"crypto/sha1"
    12  	"syscall"
    13  	"testing"
    14  )
    15  
    16  func TestOutOfBoundsRead(t *testing.T) {
    17  	cryptotest.TestAllImplementations(t, "sha1", func(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  	})
    30  }
    31  

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