98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gohacks
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import (
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"io/ioutil"
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"math/rand"
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"os"
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"runtime/debug"
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"testing"
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"golang.org/x/sys/unix"
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)
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func randBuf(size int) []byte {
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b := make([]byte, size)
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for i := range b {
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b[i] = byte(rand.Intn(256))
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}
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return b
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}
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// Size of a page in bytes. Cloned from hostarch.PageSize to avoid a circular
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// dependency.
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const pageSize = 4096
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func testCopy(dst, src []byte) (panicked bool) {
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defer func() {
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if r := recover(); r != nil {
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panicked = true
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}
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}()
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debug.SetPanicOnFault(true)
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copy(dst, src)
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return panicked
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}
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func TestSegVOnMemmove(t *testing.T) {
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// Test that SIGSEGVs received by runtime.memmove when *not* doing
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// CopyIn or CopyOut work gets propagated to the runtime.
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const bufLen = pageSize
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a, err := unix.Mmap(-1, 0, bufLen, unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE)
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if err != nil {
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t.Fatalf("Mmap failed: %v", err)
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}
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defer unix.Munmap(a)
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b := randBuf(bufLen)
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if !testCopy(b, a) {
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t.Fatalf("testCopy didn't panic when it should have")
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}
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if !testCopy(a, b) {
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t.Fatalf("testCopy didn't panic when it should have")
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}
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}
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func TestSigbusOnMemmove(t *testing.T) {
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// Test that SIGBUS received by runtime.memmove when *not* doing
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// CopyIn or CopyOut work gets propagated to the runtime.
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const bufLen = pageSize
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f, err := ioutil.TempFile("", "sigbus_test")
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if err != nil {
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t.Fatalf("TempFile failed: %v", err)
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}
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os.Remove(f.Name())
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defer f.Close()
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a, err := unix.Mmap(int(f.Fd()), 0, bufLen, unix.PROT_READ|unix.PROT_WRITE, unix.MAP_SHARED)
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if err != nil {
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t.Fatalf("Mmap failed: %v", err)
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}
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defer unix.Munmap(a)
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b := randBuf(bufLen)
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if !testCopy(b, a) {
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t.Fatalf("testCopy didn't panic when it should have")
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}
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if !testCopy(a, b) {
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t.Fatalf("testCopy didn't panic when it should have")
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}
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}
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