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How to use checkKCSAN method of host Package

Best Syzkaller code snippet using host.checkKCSAN

features_linux.go

Source:features_linux.go

...20	checkFeature[FeatureFault] = checkFault21	checkFeature[FeatureLeak] = checkLeak22	checkFeature[FeatureNetInjection] = checkNetInjection23	checkFeature[FeatureNetDevices] = unconditionallyEnabled24	checkFeature[FeatureKCSAN] = checkKCSAN25	checkFeature[FeatureDevlinkPCI] = checkDevlinkPCI26	checkFeature[FeatureUSBEmulation] = checkUSBEmulation27}28func checkCoverage() string {29	if reason := checkDebugFS(); reason != "" {30		return reason31	}32	if !osutil.IsExist("/sys/kernel/debug/kcov") {33		return "CONFIG_KCOV is not enabled"34	}35	if err := osutil.IsAccessible("/sys/kernel/debug/kcov"); err != nil {36		return err.Error()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 uint64120	// Handles []uint64 goes here.121}122func checkFault() string {123	if err := osutil.IsAccessible("/proc/self/make-it-fail"); err != nil {124		return "CONFIG_FAULT_INJECTION is not enabled"125	}126	if err := osutil.IsAccessible("/proc/thread-self/fail-nth"); err != nil {127		return "kernel does not have systematic fault injection support"128	}129	if reason := checkDebugFS(); reason != "" {130		return reason131	}132	if err := osutil.IsAccessible("/sys/kernel/debug/failslab/ignore-gfp-wait"); err != nil {133		return "CONFIG_FAULT_INJECTION_DEBUG_FS or CONFIG_FAILSLAB are not enabled"134	}135	return ""136}137func checkLeak() string {138	if reason := checkDebugFS(); reason != "" {139		return reason140	}141	fd, err := syscall.Open("/sys/kernel/debug/kmemleak", syscall.O_RDWR, 0)142	if err != nil {143		return "CONFIG_DEBUG_KMEMLEAK is not enabled"144	}145	defer syscall.Close(fd)146	if _, err := syscall.Write(fd, []byte("scan=off")); err != nil {147		if err == syscall.EBUSY {148			return "KMEMLEAK disabled: increase CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE or unset CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF"149		}150		return fmt.Sprintf("/sys/kernel/debug/kmemleak write failed: %v", err)151	}152	return ""153}154func checkSandboxNamespace() string {155	if err := osutil.IsAccessible("/proc/self/ns/user"); err != nil {156		return err.Error()157	}158	return ""159}160func checkSandboxAndroid() string {161	if err := osutil.IsAccessible("/sys/fs/selinux/policy"); err != nil {162		return err.Error()163	}164	return ""165}166func checkNetInjection() string {167	if err := osutil.IsAccessible("/dev/net/tun"); err != nil {168		return err.Error()169	}170	return ""171}172func checkUSBEmulation() string {173	if err := osutil.IsAccessible("/dev/raw-gadget"); err != nil {174		return err.Error()175	}176	return ""177}178func checkDebugFS() string {179	if err := osutil.IsAccessible("/sys/kernel/debug"); err != nil {180		return "debugfs is not enabled or not mounted"181	}182	return ""183}184func checkKCSAN() string {185	if err := osutil.IsAccessible("/sys/kernel/debug/kcsan"); err != nil {186		return err.Error()187	}188	return ""189}190func checkDevlinkPCI() string {191	if err := osutil.IsAccessible("/sys/bus/pci/devices/0000:00:10.0/"); err != nil {192		return "PCI device 0000:00:10.0 is not available"193	}194	return ""195}...

checkKCSAN

Using AI Code Generation

1import (2func main() {3    if len(os.Args) != 2 {4        fmt.Fprintf(os.Stderr, "Usage: %s host:port", os.Args[0])5        os.Exit(1)6    }7    tcpAddr, err := net.ResolveTCPAddr("tcp4", service)8    checkError(err)9    conn, err := net.DialTCP("tcp", nil, tcpAddr)10    checkError(err)11    _, err = conn.Write([]byte("HEAD / HTTP/1.0\r\n\r\n"))12    checkError(err)13    result, err := readFully(conn)14    checkError(err)15    fmt.Println(string(result))16    os.Exit(0)17}18func readFully(conn *net.TCPConn) ([]byte, error) {19    defer conn.CloseRead()20    result := make([]byte, 0, 512)21    buf := make([]byte, 512)22    for {23        n, err := conn.Read(buf[0:])24        result = append(result, buf[0:n]...)25        if err != nil {26        }27    }28}29func checkError(err error) {30    if err != nil {31        fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error())32        os.Exit(1)33    }34}35import (36func main() {37    if len(os.Args) != 2 {38        fmt.Fprintf(os.Stderr, "Usage: %s host:port", os.Args[0])39        os.Exit(1)40    }41    tcpAddr, err := net.ResolveTCPAddr("tcp4", service)42    checkError(err)43    conn, err := net.DialTCP("tcp", nil, tcpAddr)44    checkError(err)45    _, err = conn.Write([]byte("HEAD / HTTP/1.0\r\n\r\n"))46    checkError(err)47    result, err := readFully(conn)48    checkError(err)49    fmt.Println(string(result))50    os.Exit(0)51}52func readFully(conn *net.TCPConn) ([]byte, error) {53    defer conn.CloseRead()

checkKCSAN

Using AI Code Generation

1import (2func main() {3 h.AddHost(&h1)4 h.AddHost(&h2)5 fmt.Println(h.CheckKCSAN())6}

checkKCSAN

Using AI Code Generation

1import (2func main() {3    if len(os.Args) != 2 {4        fmt.Fprintf(os.Stderr, "Usage: %s hostname\n", os.Args[0])5        os.Exit(1)6    }7    ipAddr, err := net.ResolveIPAddr("ip4", service)8    if err != nil {9        fmt.Println("Resolution error", err.Error())10        os.Exit(1)11    }12    fmt.Print("Enter the port number: ")13    fmt.Scanln(&port)14    portNum, err = strconv.Atoi(port)15    for err != nil || portNum < 1 || portNum > 65535 {16        fmt.Println("Invalid port number")17        fmt.Print("Enter the port number: ")18        fmt.Scanln(&port)19        portNum, err = strconv.Atoi(port)20    }21    ipAddr, err = net.ResolveIPAddr("ip4", service)22    if err != nil {23        fmt.Println("Resolution error", err.Error())24        os.Exit(1)25    }26    fmt.Print("Enter the port number: ")27    fmt.Scanln(&port)28    portNum, err = strconv.Atoi(port)29    for err != nil || portNum < 1 || portNum > 65535 {30        fmt.Println("Invalid port number")31        fmt.Print("Enter the port number: ")32        fmt.Scanln(&port)33        portNum, err = strconv.Atoi(port)34    }35    ipAddr, err = net.ResolveIPAddr("ip4", service)36    if err != nil {37        fmt.Println("Resolution error", err.Error())38        os.Exit(1)39    }

checkKCSAN

Using AI Code Generation

1import (2func main() {3	h, err := host.Detect()4	if err != nil {5		fmt.Println(err)6	}7	hostInstance = reflect.NewAt(reflect.TypeOf(h).Elem(), unsafe.Pointer(h)).Elem()8	checkKCSAN = reflect.ValueOf(h).MethodByName("checkKCSAN")9	checkKCSAN.Call([]reflect.Value{hostInstance})10}

checkKCSAN

Using AI Code Generation

1import (2func main() {3	h := host.Host{}4	h.CheckKCSAN()5	fmt.Println(h.Output)6}7import (8func main() {9	h := host.Host{}10	h.CheckKCSAN()11	fmt.Println(h.Output)12}13import (14func main() {15	h := host.Host{}16	h.CheckKCSAN()17	fmt.Println(h.Output)18}19import (20func main() {21	h := host.Host{}22	h.CheckKCSAN()23	fmt.Println(h.Output)24}

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