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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.
package cmd
import (
"fmt"
"io/ioutil"
"os"
"strings"
"testing"
"gvisor.dev/gvisor/runsc/mitigate"
"gvisor.dev/gvisor/runsc/mitigate/mock"
)
type executeTestCase struct {
name string
mitigateData string
mitigateError error
mitigateCPU int
reverseData string
reverseError error
reverseCPU int
}
func TestExecute(t *testing.T) {
partial := `processor : 1
vendor_id : AuthenticAMD
cpu family : 23
model : 49
model name : AMD EPYC 7B12
physical id : 0
bugs : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
power management:
`
for _, tc := range []executeTestCase{
{
name: "CascadeLake4",
mitigateData: mock.CascadeLake4.MakeCPUString(),
mitigateCPU: 2,
reverseData: mock.CascadeLake4.MakeSysPossibleString(),
reverseCPU: 4,
},
{
name: "Empty",
mitigateData: "",
mitigateError: fmt.Errorf(`mitigate operation failed: no cpus found for: ""`),
reverseData: "",
reverseError: fmt.Errorf(`reverse operation failed: mismatch regex from possible: ""`),
},
{
name: "Partial",
mitigateData: `processor : 0
vendor_id : AuthenticAMD
cpu family : 23
model : 49
model name : AMD EPYC 7B12
physical id : 0
core id : 0
cpu cores : 1
bugs : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
power management::84
` + partial,
mitigateError: fmt.Errorf(`mitigate operation failed: failed to match key "core id": %q`, partial),
reverseData: "1-",
reverseError: fmt.Errorf(`reverse operation failed: mismatch regex from possible: %q`, "1-"),
},
} {
t.Run(tc.name, func(t *testing.T) {
m := &Mitigate{
dryRun: true,
vulnerable: func(other mitigate.Thread) bool {
return other.IsVulnerable()
},
}
m.doExecuteTest(t, "Mitigate", tc.mitigateData, tc.mitigateCPU, tc.mitigateError)
m.reverse = true
m.doExecuteTest(t, "Reverse", tc.reverseData, tc.reverseCPU, tc.reverseError)
})
}
}
func TestExecuteSmoke(t *testing.T) {
smokeMitigate, err := ioutil.ReadFile(cpuInfo)
if err != nil {
t.Fatalf("Failed to read %s: %v", cpuInfo, err)
}
m := &Mitigate{
dryRun: true,
vulnerable: func(other mitigate.Thread) bool {
return other.IsVulnerable()
},
}
m.doExecuteTest(t, "Mitigate", string(smokeMitigate), 0, nil)
smokeReverse, err := ioutil.ReadFile(allPossibleCPUs)
if err != nil {
t.Fatalf("Failed to read %s: %v", allPossibleCPUs, err)
}
m.reverse = true
m.doExecuteTest(t, "Reverse", string(smokeReverse), 0, nil)
}
// doExecuteTest runs Execute with the mitigate operation and reverse operation.
func (m *Mitigate) doExecuteTest(t *testing.T, name, data string, want int, wantErr error) {
t.Run(name, func(t *testing.T) {
file, err := ioutil.TempFile("", "outfile.txt")
if err != nil {
t.Fatalf("Failed to create tmpfile: %v", err)
}
defer os.Remove(file.Name())
if _, err := file.WriteString(data); err != nil {
t.Fatalf("Failed to write to file: %v", err)
}
// Set fields for mitigate and dryrun to keep test hermetic.
m.path = file.Name()
set, err := m.doExecute()
if err = checkErr(wantErr, err); err != nil {
t.Fatalf("Mitigate error mismatch: %v", err)
}
// case where test should end in error or we don't care
// about how many cpus are returned.
if wantErr != nil || want < 1 {
return
}
got := len(set.GetRemainingList())
if want != got {
t.Fatalf("Failed wrong number of remaining CPUs: want %d, got %d", want, got)
}
})
}
// checkErr checks error for equality.
func checkErr(want, got error) error {
switch {
case want == nil && got == nil:
case want != nil && got == nil:
fallthrough
case want == nil && got != nil:
fallthrough
case want.Error() != strings.Trim(got.Error(), " "):
return fmt.Errorf("got: %v want: %v", got, want)
}
return nil
}
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