2019-04-29 21:25:05 +00:00
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// Copyright 2018 The gVisor Authors.
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2018-04-27 17:37:02 +00:00
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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 kernel
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import (
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"testing"
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"gvisor.googlesource.com/gvisor/pkg/sentry/context/contexttest"
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2019-03-14 15:11:36 +00:00
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"gvisor.googlesource.com/gvisor/pkg/sentry/pgalloc"
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2018-04-27 17:37:02 +00:00
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sentrytime "gvisor.googlesource.com/gvisor/pkg/sentry/time"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usage"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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"gvisor.googlesource.com/gvisor/pkg/syserror"
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)
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// mockClocks is a sentrytime.Clocks that simply returns the times in the
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// struct.
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type mockClocks struct {
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monotonic int64
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realtime int64
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}
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// Update implements sentrytime.Clocks.Update. It does nothing.
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func (*mockClocks) Update() (monotonicParams sentrytime.Parameters, monotonicOk bool, realtimeParam sentrytime.Parameters, realtimeOk bool) {
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return
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}
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// Update implements sentrytime.Clocks.GetTime.
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func (c *mockClocks) GetTime(id sentrytime.ClockID) (int64, error) {
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switch id {
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case sentrytime.Monotonic:
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return c.monotonic, nil
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case sentrytime.Realtime:
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return c.realtime, nil
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default:
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return 0, syserror.EINVAL
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}
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}
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// stateTestClocklessTimekeeper returns a test Timekeeper which has not had
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// SetClocks called.
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func stateTestClocklessTimekeeper(tb testing.TB) *Timekeeper {
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ctx := contexttest.Context(tb)
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2019-03-14 15:11:36 +00:00
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mfp := pgalloc.MemoryFileProviderFromContext(ctx)
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fr, err := mfp.MemoryFile().Allocate(usermem.PageSize, usage.Anonymous)
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2018-04-27 17:37:02 +00:00
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if err != nil {
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tb.Fatalf("failed to allocate memory: %v", err)
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}
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return &Timekeeper{
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2019-03-14 15:11:36 +00:00
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params: NewVDSOParamPage(mfp, fr),
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2018-04-27 17:37:02 +00:00
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}
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}
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func stateTestTimekeeper(tb testing.TB) *Timekeeper {
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t := stateTestClocklessTimekeeper(tb)
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t.SetClocks(sentrytime.NewCalibratedClocks())
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return t
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}
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// TestTimekeeperMonotonicZero tests that monotonic time starts at zero.
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func TestTimekeeperMonotonicZero(t *testing.T) {
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c := &mockClocks{
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monotonic: 100000,
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}
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tk := stateTestClocklessTimekeeper(t)
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tk.SetClocks(c)
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defer tk.Destroy()
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now, err := tk.GetTime(sentrytime.Monotonic)
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if err != nil {
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t.Errorf("GetTime err got %v want nil", err)
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}
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if now != 0 {
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t.Errorf("GetTime got %d want 0", now)
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}
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c.monotonic += 10
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now, err = tk.GetTime(sentrytime.Monotonic)
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if err != nil {
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t.Errorf("GetTime err got %v want nil", err)
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}
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if now != 10 {
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t.Errorf("GetTime got %d want 10", now)
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}
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}
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// TestTimekeeperMonotonicJumpForward tests that monotonic time jumps forward
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// after restore.
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func TestTimekeeperMonotonicForward(t *testing.T) {
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c := &mockClocks{
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monotonic: 900000,
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realtime: 600000,
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}
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tk := stateTestClocklessTimekeeper(t)
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2018-07-12 22:07:59 +00:00
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tk.restored = make(chan struct{})
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2018-04-27 17:37:02 +00:00
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tk.saveMonotonic = 100000
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tk.saveRealtime = 400000
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tk.SetClocks(c)
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defer tk.Destroy()
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// The monotonic clock should jump ahead by 200000 to 300000.
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//
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// The new system monotonic time (900000) is irrelevant to what the app
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// sees.
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now, err := tk.GetTime(sentrytime.Monotonic)
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if err != nil {
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t.Errorf("GetTime err got %v want nil", err)
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}
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if now != 300000 {
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t.Errorf("GetTime got %d want 300000", now)
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}
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}
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// TestTimekeeperMonotonicJumpBackwards tests that monotonic time does not jump
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// backwards when realtime goes backwards.
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func TestTimekeeperMonotonicJumpBackwards(t *testing.T) {
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c := &mockClocks{
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monotonic: 900000,
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realtime: 400000,
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}
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tk := stateTestClocklessTimekeeper(t)
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2018-07-12 22:07:59 +00:00
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tk.restored = make(chan struct{})
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2018-04-27 17:37:02 +00:00
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tk.saveMonotonic = 100000
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tk.saveRealtime = 600000
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tk.SetClocks(c)
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defer tk.Destroy()
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// The monotonic clock should remain at 100000.
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//
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// The new system monotonic time (900000) is irrelevant to what the app
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// sees and we don't want to jump the monotonic clock backwards like
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// realtime did.
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now, err := tk.GetTime(sentrytime.Monotonic)
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if err != nil {
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t.Errorf("GetTime err got %v want nil", err)
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}
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if now != 100000 {
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t.Errorf("GetTime got %d want 100000", now)
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}
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}
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