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// Copyright 2024 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package vminfo
import (
"fmt"
"strings"
"github.com/google/syzkaller/pkg/flatrpc"
"github.com/google/syzkaller/pkg/fuzzer/queue"
"github.com/google/syzkaller/prog"
)
type Feature struct {
Enabled bool
NeedSetup bool
Reason string
}
type Features map[flatrpc.Feature]Feature
func (features Features) Enabled() flatrpc.Feature {
var mask flatrpc.Feature
for feat, info := range features {
if info.Enabled {
mask |= feat
}
}
return mask
}
func (features Features) NeedSetup() flatrpc.Feature {
var mask flatrpc.Feature
for feat, info := range features {
if info.Enabled && info.NeedSetup {
mask |= feat
}
}
return mask
}
type featureResult struct {
id flatrpc.Feature
reason string
}
func (ctx *checkContext) startFeaturesCheck() {
testProg := ctx.target.DataMmapProg()
for feat := range flatrpc.EnumNamesFeature {
if ctx.cfg.Features&feat == 0 {
ctx.features <- featureResult{feat, "disabled by user"}
continue
}
go func() {
envFlags, execFlags := ctx.featureToFlags(feat)
req := &queue.Request{
Prog: testProg,
ReturnOutput: true,
ReturnError: true,
ExecOpts: flatrpc.ExecOpts{
EnvFlags: envFlags,
ExecFlags: execFlags,
SandboxArg: ctx.cfg.SandboxArg,
},
}
ctx.executor.Submit(req)
res := req.Wait(ctx.ctx)
reason := ctx.featureSucceeded(feat, testProg, res)
ctx.features <- featureResult{feat, reason}
}()
}
}
func (ctx *checkContext) finishFeatures(featureInfos []*flatrpc.FeatureInfo) (Features, error) {
// Feature checking consists of 2 parts:
// - we ask executor to try to setup each feature (results are returned in featureInfos)
// - we also try to run a simple program with feature-specific flags
// Here we combine both results.
features := make(Features)
for _, info := range featureInfos {
features[info.Id] = Feature{
Reason: info.Reason,
NeedSetup: info.NeedSetup,
}
}
outputReplacer := strings.NewReplacer(
"SYZFAIL:", "",
"\n", ". ",
)
for range flatrpc.EnumNamesFeature {
res := <-ctx.features
feat := features[res.id]
if feat.Reason == "" {
feat.Reason = res.reason
}
if feat.Reason == "" {
feat.Reason = "enabled"
feat.Enabled = true
}
if pos := strings.Index(feat.Reason, "loop exited with status"); pos != -1 {
feat.Reason = feat.Reason[:pos]
}
// If executor exited the output is prefixed with "executor 4: EOF".
const executorPrefix = ": EOF\n"
if pos := strings.Index(feat.Reason, executorPrefix); pos != -1 {
feat.Reason = feat.Reason[pos+len(executorPrefix):]
}
feat.Reason = strings.TrimSpace(outputReplacer.Replace(feat.Reason))
features[res.id] = feat
}
if feat := features[flatrpc.FeatureSandboxNone]; !feat.Enabled {
return features, fmt.Errorf("execution of simple program fails: %v", feat.Reason)
}
if feat := features[flatrpc.FeatureCoverage]; ctx.cfg.Cover && !feat.Enabled {
return features, fmt.Errorf("coverage is not supported: %v", feat.Reason)
}
return features, nil
}
// featureToFlags creates ipc flags required to test the feature on a simple program.
// For features that has setup procedure in the executor, we just execute with the default flags.
func (ctx *checkContext) featureToFlags(feat flatrpc.Feature) (flatrpc.ExecEnv, flatrpc.ExecFlag) {
envFlags := ctx.cfg.Sandbox
// These don't have a corresponding feature and are always enabled.
envFlags |= flatrpc.ExecEnvEnableCloseFds | flatrpc.ExecEnvEnableCgroups | flatrpc.ExecEnvEnableNetReset
execFlags := flatrpc.ExecFlagThreaded
switch feat {
case flatrpc.FeatureCoverage:
envFlags |= flatrpc.ExecEnvSignal
execFlags |= flatrpc.ExecFlagCollectSignal | flatrpc.ExecFlagCollectCover
case flatrpc.FeatureComparisons:
envFlags |= flatrpc.ExecEnvSignal
execFlags |= flatrpc.ExecFlagCollectComps
case flatrpc.FeatureExtraCoverage:
envFlags |= flatrpc.ExecEnvSignal | flatrpc.ExecEnvExtraCover
execFlags |= flatrpc.ExecFlagCollectSignal | flatrpc.ExecFlagCollectCover
case flatrpc.FeatureDelayKcovMmap:
envFlags |= flatrpc.ExecEnvSignal | flatrpc.ExecEnvDelayKcovMmap
execFlags |= flatrpc.ExecFlagCollectSignal | flatrpc.ExecFlagCollectCover
case flatrpc.FeatureKcovResetIoctl:
envFlags |= flatrpc.ExecEnvReadOnlyCoverage
case flatrpc.FeatureSandboxNone:
envFlags &= ^ctx.cfg.Sandbox
envFlags |= flatrpc.ExecEnvSandboxNone
case flatrpc.FeatureSandboxSetuid:
envFlags &= ^ctx.cfg.Sandbox
envFlags |= flatrpc.ExecEnvSandboxSetuid
case flatrpc.FeatureSandboxNamespace:
envFlags &= ^ctx.cfg.Sandbox
envFlags |= flatrpc.ExecEnvSandboxNamespace
case flatrpc.FeatureSandboxAndroid:
envFlags &= ^ctx.cfg.Sandbox
envFlags |= flatrpc.ExecEnvSandboxAndroid
case flatrpc.FeatureFault:
case flatrpc.FeatureLeak:
case flatrpc.FeatureNetInjection:
envFlags |= flatrpc.ExecEnvEnableTun
case flatrpc.FeatureNetDevices:
envFlags |= flatrpc.ExecEnvEnableNetDev
case flatrpc.FeatureKCSAN:
case flatrpc.FeatureDevlinkPCI:
envFlags |= flatrpc.ExecEnvEnableDevlinkPCI
case flatrpc.FeatureNicVF:
envFlags |= flatrpc.ExecEnvEnableNicVF
case flatrpc.FeatureUSBEmulation:
case flatrpc.FeatureVhciInjection:
envFlags |= flatrpc.ExecEnvEnableVhciInjection
case flatrpc.FeatureWifiEmulation:
envFlags |= flatrpc.ExecEnvEnableWifi
case flatrpc.FeatureLRWPANEmulation:
case flatrpc.FeatureBinFmtMisc:
case flatrpc.FeatureSwap:
default:
panic(fmt.Sprintf("unknown feature %v", flatrpc.EnumNamesFeature[feat]))
}
return envFlags, execFlags
}
// featureSucceeded checks if execution of a simple program with feature-specific flags succeed.
// This generally checks that just all syscalls were executed and succeed,
// for coverage features we also check that we got actual coverage.
func (ctx *checkContext) featureSucceeded(feat flatrpc.Feature, testProg *prog.Prog,
res *queue.Result) string {
if res.Status != queue.Success {
if len(res.Output) != 0 {
return string(res.Output)
}
if res.Err != nil {
return res.Err.Error()
}
return fmt.Sprintf("test program execution failed: status=%v", res.Status)
}
if len(res.Info.Calls) != len(testProg.Calls) {
return fmt.Sprintf("only %v calls are executed out of %v",
len(res.Info.Calls), len(testProg.Calls))
}
for i, call := range res.Info.Calls {
if call.Error != 0 {
return fmt.Sprintf("call %v failed with errno %v", i, call.Error)
}
}
call := res.Info.Calls[0]
switch feat {
case flatrpc.FeatureCoverage:
if len(call.Cover) == 0 || len(call.Signal) == 0 {
return "got no coverage"
}
case flatrpc.FeatureComparisons:
if len(call.Comps) == 0 {
return "got no coverage"
}
}
return ""
}
|
