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https://github.com/hanzoai/visor.git
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Andrei VaginandgVisor bot
395654587c
SError-s are blocked in the kernel context (A-bit in PSTATE). Fixes #6629 PiperOrigin-RevId: 754196342
100 lines
2.6 KiB
Go
100 lines
2.6 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 kvm
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import (
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"fmt"
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"os"
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"testing"
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"unsafe"
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"golang.org/x/sys/unix"
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"gvisor.dev/gvisor/pkg/hostarch"
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"gvisor.dev/gvisor/pkg/memutil"
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"gvisor.dev/gvisor/pkg/safecopy"
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)
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func testSafecopy(t *testing.T, mapSize uintptr, fileSize uintptr, testFunc func(t *testing.T, c *vCPU, addr uintptr)) {
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memfd, err := memutil.CreateMemFD(fmt.Sprintf("kvm_test_%d", os.Getpid()), 0)
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if err != nil {
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t.Errorf("error creating memfd: %v", err)
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}
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memfile := os.NewFile(uintptr(memfd), "kvm_test")
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memfile.Truncate(int64(fileSize))
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kvmTest(t, nil, func(c *vCPU) bool {
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const n = 10
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mappings := make([]uintptr, n)
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defer func() {
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for i := 0; i < n && mappings[i] != 0; i++ {
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unix.RawSyscall(
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unix.SYS_MUNMAP,
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mappings[i], mapSize, 0)
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}
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}()
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for i := 0; i < n; i++ {
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addr, _, errno := unix.RawSyscall6(
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unix.SYS_MMAP,
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0,
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mapSize,
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unix.PROT_READ|unix.PROT_WRITE,
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unix.MAP_SHARED|unix.MAP_FILE,
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uintptr(memfile.Fd()),
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0)
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if errno != 0 {
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t.Fatalf("error mapping file: %v", errno)
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}
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mappings[i] = addr
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testFunc(t, c, addr)
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}
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return false
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})
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}
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var mapSize = faultBlockSize
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func TestSafecopySigbus(t *testing.T) {
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fileSize := mapSize - hostarch.PageSize
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buf := make([]byte, hostarch.PageSize)
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testSafecopy(t, mapSize, fileSize, func(t *testing.T, c *vCPU, addr uintptr) {
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want := safecopy.BusError{addr + fileSize}
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bluepill(c)
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_, err := safecopy.CopyIn(buf, unsafe.Pointer(addr+fileSize))
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if err != want {
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t.Errorf("expected error: got %v, want %v", err, want)
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}
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})
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}
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func TestSafecopy(t *testing.T) {
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fileSize := mapSize
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testSafecopy(t, mapSize, fileSize, func(t *testing.T, c *vCPU, addr uintptr) {
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want := uint32(0x12345678)
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bluepill(c)
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_, err := safecopy.SwapUint32(unsafe.Pointer(addr+fileSize-8), want)
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if err != nil {
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t.Errorf("unexpected error: %v", err)
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}
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bluepill(c)
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val, err := safecopy.LoadUint32(unsafe.Pointer(addr + fileSize - 8))
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if err != nil {
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t.Errorf("unexpected error: %v", err)
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}
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if val != want {
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t.Errorf("incorrect value: got %x, want %x", val, want)
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}
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})
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}
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