mirror of
https://github.com/golang/go
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62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime_test
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import (
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"io/ioutil"
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"os"
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"reflect"
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"syscall"
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"testing"
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"unsafe"
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)
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// TestMemmoveOverflow maps 3GB of memory and calls memmove on
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// the corresponding slice.
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func TestMemmoveOverflow(t *testing.T) {
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// Create a temporary file.
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tmp, err := ioutil.TempFile("", "go-memmovetest")
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if err != nil {
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t.Fatal(err)
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}
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_, err = tmp.Write(make([]byte, 65536))
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(tmp.Name())
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defer tmp.Close()
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// Set up mappings.
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base, _, errno := syscall.Syscall6(syscall.SYS_MMAP,
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0xa0<<32, 3<<30, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_PRIVATE|syscall.MAP_ANONYMOUS, ^uintptr(0), 0)
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if errno != 0 {
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t.Skipf("could not create memory mapping: %s", errno)
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}
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syscall.Syscall(syscall.SYS_MUNMAP, base, 3<<30, 0)
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for off := uintptr(0); off < 3<<30; off += 65536 {
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_, _, errno := syscall.Syscall6(syscall.SYS_MMAP,
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base+off, 65536, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_FIXED, tmp.Fd(), 0)
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if errno != 0 {
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t.Fatalf("could not map a page at requested 0x%x: %s", base+off, errno)
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}
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defer syscall.Syscall(syscall.SYS_MUNMAP, base+off, 65536, 0)
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}
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var s []byte
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sp := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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sp.Data = base
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sp.Len, sp.Cap = 3<<30, 3<<30
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n := copy(s[1:], s)
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if n != 3<<30-1 {
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t.Fatalf("copied %d bytes, expected %d", n, 3<<30-1)
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}
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n = copy(s, s[1:])
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if n != 3<<30-1 {
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t.Fatalf("copied %d bytes, expected %d", n, 3<<30-1)
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}
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}
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