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