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// 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 pagetables
import (
"reflect"
"testing"
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
)
type reflectTranslater struct{}
func (r reflectTranslater) TranslateToPhysical(ptes *PTEs) uintptr {
return reflect.ValueOf(ptes).Pointer()
}
type mapping struct {
start uintptr
length uintptr
addr uintptr
writeable bool
}
func checkMappings(t *testing.T, pt *PageTables, m []mapping) {
var (
current int
found []mapping
failed string
)
// Iterate over all the mappings.
pt.iterateRange(0, ^uintptr(0), false, func(s, e uintptr, pte *PTE, align uintptr) {
found = append(found, mapping{
start: s,
length: e - s,
addr: pte.Address(),
writeable: pte.Writeable(),
})
if failed != "" {
// Don't keep looking for errors.
return
}
if current >= len(m) {
failed = "more mappings than expected"
} else if m[current].start != s {
failed = "start didn't match expected"
} else if m[current].length != (e - s) {
failed = "end didn't match expected"
} else if m[current].addr != pte.Address() {
failed = "address didn't match expected"
} else if m[current].writeable != pte.Writeable() {
failed = "writeable didn't match"
}
current++
})
// Were we expected additional mappings?
if failed == "" && current != len(m) {
failed = "insufficient mappings found"
}
// Emit a meaningful error message on failure.
if failed != "" {
t.Errorf("%s; got %#v, wanted %#v", failed, found, m)
}
}
func TestAllocFree(t *testing.T) {
pt := New(reflectTranslater{}, Opts{})
pt.Release()
}
func TestUnmap(t *testing.T) {
pt := New(reflectTranslater{}, Opts{})
// Map and unmap one entry.
pt.Map(0x400000, pteSize, true, usermem.ReadWrite, pteSize*42)
pt.Unmap(0x400000, pteSize)
checkMappings(t, pt, nil)
pt.Release()
}
func TestReadOnly(t *testing.T) {
pt := New(reflectTranslater{}, Opts{})
// Map one entry.
pt.Map(0x400000, pteSize, true, usermem.Read, pteSize*42)
checkMappings(t, pt, []mapping{
{0x400000, pteSize, pteSize * 42, false},
})
pt.Release()
}
func TestReadWrite(t *testing.T) {
pt := New(reflectTranslater{}, Opts{})
// Map one entry.
pt.Map(0x400000, pteSize, true, usermem.ReadWrite, pteSize*42)
checkMappings(t, pt, []mapping{
{0x400000, pteSize, pteSize * 42, true},
})
pt.Release()
}
func TestSerialEntries(t *testing.T) {
pt := New(reflectTranslater{}, Opts{})
// Map two sequential entries.
pt.Map(0x400000, pteSize, true, usermem.ReadWrite, pteSize*42)
pt.Map(0x401000, pteSize, true, usermem.ReadWrite, pteSize*47)
checkMappings(t, pt, []mapping{
{0x400000, pteSize, pteSize * 42, true},
{0x401000, pteSize, pteSize * 47, true},
})
pt.Release()
}
func TestSpanningEntries(t *testing.T) {
pt := New(reflectTranslater{}, Opts{})
// Span a pgd with two pages.
pt.Map(0x00007efffffff000, 2*pteSize, true, usermem.Read, pteSize*42)
checkMappings(t, pt, []mapping{
{0x00007efffffff000, pteSize, pteSize * 42, false},
{0x00007f0000000000, pteSize, pteSize * 43, false},
})
pt.Release()
}
func TestSparseEntries(t *testing.T) {
pt := New(reflectTranslater{}, Opts{})
// Map two entries in different pgds.
pt.Map(0x400000, pteSize, true, usermem.ReadWrite, pteSize*42)
pt.Map(0x00007f0000000000, pteSize, true, usermem.Read, pteSize*47)
checkMappings(t, pt, []mapping{
{0x400000, pteSize, pteSize * 42, true},
{0x00007f0000000000, pteSize, pteSize * 47, false},
})
pt.Release()
}
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