94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
// Copyright 2018 Google Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package kvm
|
|
|
|
import (
|
|
"syscall"
|
|
"testing"
|
|
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
|
|
)
|
|
|
|
type checker struct {
|
|
ok bool
|
|
accessType usermem.AccessType
|
|
}
|
|
|
|
func (c *checker) Containing(addr uintptr) func(virtualRegion) {
|
|
c.ok = false // Reset for below calls.
|
|
return func(vr virtualRegion) {
|
|
if vr.virtual <= addr && addr < vr.virtual+vr.length {
|
|
c.ok = true
|
|
c.accessType = vr.accessType
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestParseMaps(t *testing.T) {
|
|
c := new(checker)
|
|
|
|
// Simple test.
|
|
if err := applyVirtualRegions(c.Containing(0)); err != nil {
|
|
t.Fatalf("unexpected error: %v", err)
|
|
}
|
|
|
|
// MMap a new page.
|
|
addr, _, errno := syscall.RawSyscall6(
|
|
syscall.SYS_MMAP, 0, usermem.PageSize,
|
|
syscall.PROT_READ|syscall.PROT_WRITE,
|
|
syscall.MAP_ANONYMOUS|syscall.MAP_PRIVATE, 0, 0)
|
|
if errno != 0 {
|
|
t.Fatalf("unexpected map error: %v", errno)
|
|
}
|
|
|
|
// Re-parse maps.
|
|
if err := applyVirtualRegions(c.Containing(addr)); err != nil {
|
|
syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0)
|
|
t.Fatalf("unexpected error: %v", err)
|
|
}
|
|
|
|
// Assert that it now does contain the region.
|
|
if !c.ok {
|
|
syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0)
|
|
t.Fatalf("updated map does not contain 0x%08x, expected true", addr)
|
|
}
|
|
|
|
// Map the region as PROT_NONE.
|
|
newAddr, _, errno := syscall.RawSyscall6(
|
|
syscall.SYS_MMAP, addr, usermem.PageSize,
|
|
syscall.PROT_NONE,
|
|
syscall.MAP_ANONYMOUS|syscall.MAP_FIXED|syscall.MAP_PRIVATE, 0, 0)
|
|
if errno != 0 {
|
|
t.Fatalf("unexpected map error: %v", errno)
|
|
}
|
|
if newAddr != addr {
|
|
t.Fatalf("unable to remap address: got 0x%08x, wanted 0x%08x", newAddr, addr)
|
|
}
|
|
|
|
// Re-parse maps.
|
|
if err := applyVirtualRegions(c.Containing(addr)); err != nil {
|
|
t.Fatalf("unexpected error: %v", err)
|
|
}
|
|
if !c.ok {
|
|
t.Fatalf("final map does not contain 0x%08x, expected true", addr)
|
|
}
|
|
if c.accessType.Read || c.accessType.Write || c.accessType.Execute {
|
|
t.Fatalf("final map has incorrect permissions for 0x%08x", addr)
|
|
}
|
|
|
|
// Unmap the region.
|
|
syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0)
|
|
}
|