How to use checkCoverageFeature method of host Package

Best Syzkaller code snippet using host.checkCoverageFeature

features_linux.go

Source:features_linux.go

...37	}38	return ""39}40func checkComparisons() (reason string) {41	return checkCoverageFeature(FeatureComparisons)42}43func checkExtraCoverage() (reason string) {44	return checkCoverageFeature(FeatureExtraCoverage)45}46func checkCoverageFeature(feature int) (reason string) {47	if reason = checkDebugFS(); reason != "" {48		return reason49	}50	// TODO(dvyukov): this should run under target arch.51	// E.g. KCOV ioctls were initially not supported on 386 (missing compat_ioctl),52	// and a 386 executor won't be able to use them, but an amd64 fuzzer will be.53	fd, err := syscall.Open("/sys/kernel/debug/kcov", syscall.O_RDWR, 0)54	if err != nil {55		return "CONFIG_KCOV is not enabled"56	}57	defer syscall.Close(fd)58	// Trigger host target lazy initialization, it will fill linux.KCOV_INIT_TRACE.59	// It's all wrong and needs to be refactored.60	if _, err := prog.GetTarget(runtime.GOOS, runtime.GOARCH); err != nil {61		return fmt.Sprintf("failed to get target: %v", err)62	}63	coverSize := uintptr(64 << 10)64	_, _, errno := syscall.Syscall(65		syscall.SYS_IOCTL, uintptr(fd), linux.KCOV_INIT_TRACE, coverSize)66	if errno != 0 {67		return fmt.Sprintf("ioctl(KCOV_INIT_TRACE) failed: %v", errno)68	}69	mem, err := syscall.Mmap(fd, 0, int(coverSize*unsafe.Sizeof(uintptr(0))),70		syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED)71	if err != nil {72		return fmt.Sprintf("KCOV mmap failed: %v", err)73	}74	defer func() {75		if err := syscall.Munmap(mem); err != nil {76			reason = fmt.Sprintf("munmap failed: %v", err)77		}78	}()79	switch feature {80	case FeatureComparisons:81		_, _, errno = syscall.Syscall(syscall.SYS_IOCTL,82			uintptr(fd), linux.KCOV_ENABLE, linux.KCOV_TRACE_CMP)83		if errno != 0 {84			if errno == 524 { // ENOTSUPP85				return "CONFIG_KCOV_ENABLE_COMPARISONS is not enabled"86			}87			return fmt.Sprintf("ioctl(KCOV_TRACE_CMP) failed: %v", errno)88		}89	case FeatureExtraCoverage:90		arg := KcovRemoteArg{91			TraceMode:    uint32(linux.KCOV_TRACE_PC),92			AreaSize:     uint32(coverSize * unsafe.Sizeof(uintptr(0))),93			NumHandles:   0,94			CommonHandle: 0,95		}96		_, _, errno = syscall.Syscall(syscall.SYS_IOCTL,97			uintptr(fd), linux.KCOV_REMOTE_ENABLE, uintptr(unsafe.Pointer(&arg)))98		if errno != 0 {99			if errno == 25 { // ENOTTY100				return "extra coverage is not supported by the kernel"101			}102			return fmt.Sprintf("ioctl(KCOV_REMOTE_ENABLE) failed: %v", errno)103		}104	default:105		panic("unknown feature in checkCoverageFeature")106	}107	defer func() {108		_, _, errno = syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), linux.KCOV_DISABLE, 0)109		if errno != 0 {110			reason = fmt.Sprintf("ioctl(KCOV_DISABLE) failed: %v", errno)111		}112	}()113	return ""114}115type KcovRemoteArg struct {116	TraceMode    uint32117	AreaSize     uint32118	NumHandles   uint32119	CommonHandle uint64...

checkCoverageFeature

Using AI Code Generation

1import (2func main() {3	reader := bufio.NewReader(os.Stdin)4	fmt.Print("Enter text: ")5	text, _ := reader.ReadString('6	text = strings.ToUpper(text)7	fmt.Println(text)8}9import (10func main() {11	reader := bufio.NewReader(os.Stdin)12	fmt.Print("Enter text: ")13	text, _ := reader.ReadString('14	text = strings.ToUpper(text)15	fmt.Println(text)16}17import (18func main() {19	reader := bufio.NewReader(os.Stdin)20	fmt.Print("Enter text: ")21	text, _ := reader.ReadString('22	text = strings.ToUpper(text)23	fmt.Println(text)24}25import (26func main() {27	reader := bufio.NewReader(os.Stdin)28	fmt.Print("Enter text: ")29	text, _ := reader.ReadString('30	text = strings.ToUpper(text)31	fmt.Println(text)32}33import (34func main() {35	reader := bufio.NewReader(os.Stdin)36	fmt.Print("Enter text: ")37	text, _ := reader.ReadString('38	text = strings.ToUpper(text)39	fmt.Println(text)40}

checkCoverageFeature

Using AI Code Generation

1import (2func main() {3    if len(os.Args) != 2 {4        fmt.Fprintf(os.Stderr, "Usage: %s ip-addr", os.Args[0])5        os.Exit(1)6    }7    addr := net.ParseIP(name)8    if addr == nil {9        fmt.Println("Invalid address")10    } else {11        fmt.Println("The address is ", addr.String())12    }13    os.Exit(0)14}

checkCoverageFeature

Using AI Code Generation

1import (2type Host struct {3}4func (h *Host) checkCoverageFeature() {5	fmt.Println("Checking Coverage Feature")6}7func main() {8	host := Host{"Host1"}9	p := (*[2]uintptr)(unsafe.Pointer(&host))10	fn := unsafe.Pointer(p[1])11	f := *(*func())(unsafe.Pointer(&fn))12	f()13}

checkCoverageFeature

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println("Hello, playground")4    host.checkCoverageFeature()5}6type Host struct {7}8func (h *Host) checkCoverageFeature() {9}10type Coverage struct {11}12func (c *Coverage) checkCoverageFeature() {13}14./2.go:9: cannot use host (type Host) as type Coverage in argument to checkCoverageFeature:15        Host does not implement Coverage (missing checkCoverageFeature method)16× Email codedump link for Go: cannot use host (type Host) as type Coverage in argument to checkCoverageFeature

checkCoverageFeature

Using AI Code Generation

1import (2func main() {3	h := new(Host)4	t := reflect.TypeOf(*h)5	m, _ := t.MethodByName("checkCoverageFeature")6	args := make([]reflect.Value, 0)7	res := m.Func.Call(args)8	fmt.Println(res[0].Bool())9}

checkCoverageFeature

Using AI Code Generation

1import (2func main() {3	host := &Host{}4	feature := &Feature{}5	newFeature := &Feature{}6	newFeature1 := &Feature{}7	newFeature2 := &Feature{}8	newFeature3 := &Feature{}9	newFeature4 := &Feature{}10	newFeature5 := &Feature{}11	newFeature6 := &Feature{}12	newFeature7 := &Feature{}13	newFeature8 := &Feature{}14	newFeature9 := &Feature{}15	newFeature10 := &Feature{}16	newFeature11 := &Feature{}17	newFeature12 := &Feature{}18	newFeature13 := &Feature{}19	newFeature14 := &Feature{}20	newFeature15 := &Feature{}

checkCoverageFeature

Using AI Code Generation

1import (2func main() {3	if h.CheckCoverageFeature() {4		data = h.GetCoverageData()5		fmt.Println("Coverage data:", data)6	} else {7		fmt.Println("Coverage feature is disabled")8	}9}10import (11type Host struct {12}13func (h *Host) CheckCoverageFeature() bool {14	if runtime.CoverageEnabled() {15	}16}17func (h *Host) GetCoverageData() []byte {18	data := runtime.Coverage()19}20Related posts: Go runtime.CoverageEnabled() Method Go runtime.Coverage() Method Go runtime.CoverProfile() Method Go runtime.CoverBlock() Method Go runtime.SetMutexProfileFraction() Method Go runtime.SetCPUProfileRate() Method Go runtime.SetBlockP

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