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