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// Copyright 2018 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 host
import (
"time"
"github.com/google/syzkaller/pkg/csource"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/prog"
"github.com/google/syzkaller/sys/targets"
)
const (
FeatureCoverage = iota
FeatureComparisons
FeatureExtraCoverage
FeatureSandboxSetuid
FeatureSandboxNamespace
FeatureSandboxAndroid
FeatureFault
FeatureLeak
FeatureNetInjection
FeatureNetDevices
FeatureKCSAN
FeatureDevlinkPCI
numFeatures
)
type Feature struct {
Name string
Enabled bool
Reason string
}
type Features [numFeatures]Feature
func (features *Features) Supported() *Features {
return features
}
var checkFeature [numFeatures]func() string
func unconditionallyEnabled() string { return "" }
// Check detects features supported on the host.
// Empty string for a feature means the feature is supported,
// otherwise the string contains the reason why the feature is not supported.
func Check(target *prog.Target) (*Features, error) {
const unsupported = "support is not implemented in syzkaller"
res := &Features{
FeatureCoverage: {Name: "code coverage", Reason: unsupported},
FeatureComparisons: {Name: "comparison tracing", Reason: unsupported},
FeatureExtraCoverage: {Name: "extra coverage", Reason: unsupported},
FeatureSandboxSetuid: {Name: "setuid sandbox", Reason: unsupported},
FeatureSandboxNamespace: {Name: "namespace sandbox", Reason: unsupported},
FeatureSandboxAndroid: {Name: "Android sandbox", Reason: unsupported},
FeatureFault: {Name: "fault injection", Reason: unsupported},
FeatureLeak: {Name: "leak checking", Reason: unsupported},
FeatureNetInjection: {Name: "net packet injection", Reason: unsupported},
FeatureNetDevices: {Name: "net device setup", Reason: unsupported},
FeatureKCSAN: {Name: "concurrency sanitizer", Reason: unsupported},
FeatureDevlinkPCI: {Name: "devlink PCI setup", Reason: unsupported},
}
if targets.Get(target.OS, target.Arch).HostFuzzer {
return res, nil
}
for n, check := range checkFeature {
if check == nil {
continue
}
if reason := check(); reason == "" {
res[n].Enabled = true
res[n].Reason = "enabled"
} else {
res[n].Reason = reason
}
}
return res, nil
}
// Setup enables and does any one-time setup for the requested features on the host.
// Note: this can be called multiple times and must be idempotent.
func Setup(target *prog.Target, features *Features, featureFlags csource.Features, executor string) error {
if targets.Get(target.OS, target.Arch).HostFuzzer {
return nil
}
args := []string{"setup"}
if features[FeatureLeak].Enabled {
args = append(args, "leak")
}
if features[FeatureFault].Enabled {
args = append(args, "fault")
}
if target.OS == "linux" && featureFlags["binfmt_misc"].Enabled {
args = append(args, "binfmt_misc")
}
if features[FeatureKCSAN].Enabled {
args = append(args, "kcsan")
}
_, err := osutil.RunCmd(time.Minute, "", executor, args...)
return err
}
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