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// Copyright 2021 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.
//go:build amd64
// +build amd64
package cmd
import (
"testing"
"github.com/google/subcommands"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/runsc/mitigate"
)
type mockMachineControl struct {
enabled bool
cpus mitigate.CPUSet
}
func (m *mockMachineControl) enable() error {
m.enabled = true
return nil
}
func (m *mockMachineControl) disable() error {
if m.cpus.IsVulnerable() {
m.enabled = false
}
return nil
}
func (m *mockMachineControl) isEnabled() (bool, error) {
return m.enabled, nil
}
func (m *mockMachineControl) getCPUs() (mitigate.CPUSet, error) {
set := m.cpus
if !m.enabled {
set = m.cpus[:len(m.cpus)/2]
}
// Instead of just returning the created CPU set stored in this struct, call
// NewCPUSet to exercise that code path as the machineControlImpl would.
return mitigate.NewCPUSet(set.String())
}
type executeTestCase struct {
name string
cpu mitigate.MockCPU
mitigateWantCPUs int
mitigateError subcommands.ExitStatus
mitigateWantEnabled bool
reverseWantCPUs int
reverseError subcommands.ExitStatus
reverseWantEnabled bool
dryrun bool
}
func TestExecute(t *testing.T) {
for _, tc := range []executeTestCase{
{
name: "CascadeLake4",
cpu: mitigate.CascadeLake4,
mitigateWantCPUs: 2,
mitigateWantEnabled: false,
reverseWantCPUs: 4,
reverseWantEnabled: true,
},
{
name: "CascadeLake4DryRun",
cpu: mitigate.CascadeLake4,
mitigateWantCPUs: 4,
mitigateWantEnabled: true,
reverseWantCPUs: 4,
reverseWantEnabled: true,
dryrun: true,
},
{
name: "AMD8",
cpu: mitigate.AMD8,
mitigateWantCPUs: 8,
mitigateWantEnabled: true,
reverseWantCPUs: 8,
reverseWantEnabled: true,
},
{
name: "Empty",
cpu: mitigate.Empty,
mitigateError: Errorf(`mitigate operation failed: no cpus found for: ""`),
reverseError: Errorf(`mitigate operation failed: no cpus found for: ""`),
},
} {
t.Run(tc.name, func(t *testing.T) {
set := tc.cpu.MakeCPUSet()
m := &Mitigate{
control: &mockMachineControl{
enabled: true,
cpus: set,
},
dryRun: tc.dryrun,
}
t.Run("Mitigate", func(t *testing.T) {
m.doExecuteTest(t, tc.mitigateWantEnabled, tc.mitigateWantCPUs, tc.mitigateError)
})
m.reverse = true
t.Run("Reverse", func(t *testing.T) {
m.doExecuteTest(t, tc.reverseWantEnabled, tc.reverseWantCPUs, tc.reverseError)
})
})
}
}
// doExecuteTest runs Execute with the mitigate operation and reverse operation.
func (m *Mitigate) doExecuteTest(t *testing.T, wantEnabled bool, wantCPUs int, wantErr subcommands.ExitStatus) {
subError := m.execute()
if subError != wantErr {
t.Fatalf("Mitigate error mismatch: want: %v got: %v", wantErr, subError)
}
// case where test should end in error or we don't care
// about how many cpus are returned.
if wantErr != subcommands.ExitSuccess {
log.Infof("return")
return
}
gotEnabled, _ := m.control.isEnabled()
if wantEnabled != gotEnabled {
t.Fatalf("Incorrect enabled state: want: %t got: %t", wantEnabled, gotEnabled)
}
gotCPUs, _ := m.control.getCPUs()
if len(gotCPUs) != wantCPUs {
t.Fatalf("Incorrect number of CPUs: want: %d got: %d", wantCPUs, len(gotCPUs))
}
}
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