How to use kcovTestMmap method of host Package

Best Syzkaller code snippet using host.kcovTestMmap

features_linux.go

Source:features_linux.go

...57	// syzkaller to differentiate between distributions as this allows to noticeably speed58	// up fuzzing.59	return checkCoverageFeature(FeatureDelayKcovMmap)60}61func kcovTestMmap(fd int, coverSize uintptr) (reason string) {62	mem, err := syscall.Mmap(fd, 0, int(coverSize*unsafe.Sizeof(uintptr(0))),63		syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED)64	if err != nil {65		return fmt.Sprintf("KCOV mmap failed: %v", err)66	}67	defer func() {68		if err := syscall.Munmap(mem); err != nil {69			reason = fmt.Sprintf("munmap failed: %v", err)70		}71	}()72	// Now the tricky part - mmap may say it has succeeded, but the memory is73	// in fact not allocated.74	// We try to access it. If go does not panic, everything is fine.75	prevValue := debug.SetPanicOnFault(true)76	defer debug.SetPanicOnFault(prevValue)77	defer func() {78		if r := recover(); r != nil {79			reason = "mmap returned an invalid pointer"80		}81	}()82	mem[0] = 083	return ""84}85func checkCoverageFeature(feature int) (reason string) {86	if reason = checkDebugFS(); reason != "" {87		return reason88	}89	// TODO(dvyukov): this should run under target arch.90	// E.g. KCOV ioctls were initially not supported on 386 (missing compat_ioctl),91	// and a 386 executor won't be able to use them, but an amd64 fuzzer will be.92	fd, err := syscall.Open("/sys/kernel/debug/kcov", syscall.O_RDWR, 0)93	if err != nil {94		return "CONFIG_KCOV is not enabled"95	}96	defer syscall.Close(fd)97	// Trigger host target lazy initialization, it will fill linux.KCOV_INIT_TRACE.98	// It's all wrong and needs to be refactored.99	if _, err := prog.GetTarget(runtime.GOOS, runtime.GOARCH); err != nil {100		return fmt.Sprintf("failed to get target: %v", err)101	}102	coverSize := uintptr(64 << 10)103	_, _, errno := syscall.Syscall(104		syscall.SYS_IOCTL, uintptr(fd), linux.KCOV_INIT_TRACE, coverSize)105	if errno != 0 {106		return fmt.Sprintf("ioctl(KCOV_INIT_TRACE) failed: %v", errno)107	}108	if reason = kcovTestMmap(fd, coverSize); reason != "" {109		return reason110	}111	disableKcov := func() {112		_, _, errno = syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), linux.KCOV_DISABLE, 0)113		if errno != 0 {114			reason = fmt.Sprintf("ioctl(KCOV_DISABLE) failed: %v", errno)115		}116	}117	switch feature {118	case FeatureComparisons:119		_, _, errno = syscall.Syscall(syscall.SYS_IOCTL,120			uintptr(fd), linux.KCOV_ENABLE, linux.KCOV_TRACE_CMP)121		if errno != 0 {122			if errno == 524 { // ENOTSUPP123				return "CONFIG_KCOV_ENABLE_COMPARISONS is not enabled"124			}125			return fmt.Sprintf("ioctl(KCOV_TRACE_CMP) failed: %v", errno)126		}127		defer disableKcov()128	case FeatureExtraCoverage:129		arg := KcovRemoteArg{130			TraceMode:    uint32(linux.KCOV_TRACE_PC),131			AreaSize:     uint32(coverSize * unsafe.Sizeof(uintptr(0))),132			NumHandles:   0,133			CommonHandle: 0,134		}135		_, _, errno = syscall.Syscall(syscall.SYS_IOCTL,136			uintptr(fd), linux.KCOV_REMOTE_ENABLE, uintptr(unsafe.Pointer(&arg)))137		if errno != 0 {138			if errno == 25 { // ENOTTY139				return "extra coverage is not supported by the kernel"140			}141			return fmt.Sprintf("ioctl(KCOV_REMOTE_ENABLE) failed: %v", errno)142		}143		defer disableKcov()144	case FeatureDelayKcovMmap:145		if reason = kcovTestMmap(fd, coverSize); reason != "" {146			return reason147		}148	default:149		panic("unknown feature in checkCoverageFeature")150	}151	return ""152}153type KcovRemoteArg struct {154	TraceMode    uint32155	AreaSize     uint32156	NumHandles   uint32157	_            uint32158	CommonHandle uint64159	// Handles []uint64 goes here....

kcovTestMmap

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println("Hello, playground")4}5import "fmt"6func main() {7    fmt.Println("Hello, playground")8}9import "fmt"10func main() {11    fmt.Println("Hello, playground")12}13import "fmt"14func main() {15    fmt.Println("Hello, playground")16}17import "fmt"18func main() {19    fmt.Println("Hello, playground")20}21import "fmt"22func main() {23    fmt.Println("Hello, playground")24}25import "fmt"26func main() {27    fmt.Println("Hello, playground")28}29import "fmt"30func main() {31    fmt.Println("Hello, playground")32}33import "fmt"34func main() {35    fmt.Println("Hello, playground")36}37import "fmt"38func main() {39    fmt.Println("Hello, playground")40}41import "fmt"42func main() {43    fmt.Println("Hello, playground")44}45import "fmt"46func main() {47    fmt.Println("Hello, playground")48}49import "fmt

kcovTestMmap

Using AI Code Generation

1func kcovTestMmap() {2    host := NewHost()3    host.kcovTestMmap()4}5func kcovTestMmap() {6    host := NewHost()7    host.kcovTestMmap()8}9func kcovTestMmap() {10    host := NewHost()11    host.kcovTestMmap()12}13func kcovTestMmap() {14    host := NewHost()15    host.kcovTestMmap()16}17func kcovTestMmap() {18    host := NewHost()19    host.kcovTestMmap()20}21func kcovTestMmap() {22    host := NewHost()23    host.kcovTestMmap()24}25func kcovTestMmap() {26    host := NewHost()27    host.kcovTestMmap()28}29func kcovTestMmap() {30    host := NewHost()31    host.kcovTestMmap()32}33func kcovTestMmap() {34    host := NewHost()35    host.kcovTestMmap()36}37func kcovTestMmap() {38    host := NewHost()39    host.kcovTestMmap()40}41func kcovTestMmap() {42    host := NewHost()43    host.kcovTestMmap()44}45func kcovTestMmap() {46    host := NewHost()

kcovTestMmap

Using AI Code Generation

1func main() {2    host := Host{}3    host.kcovTestMmap()4}5func main() {6    host := Host{}7    host.kcovTestMmap()8}9func main() {10    host := Host{}11    host.kcovTestMmap()12}13func main() {14    host := Host{}15    host.kcovTestMmap()16}17func main() {18    host := Host{}19    host.kcovTestMmap()20}21func main() {22    host := Host{}23    host.kcovTestMmap()24}25func main() {26    host := Host{}27    host.kcovTestMmap()28}29func main() {30    host := Host{}31    host.kcovTestMmap()32}33func main() {34    host := Host{}35    host.kcovTestMmap()36}37func main() {38    host := Host{}39    host.kcovTestMmap()40}41func main() {42    host := Host{}43    host.kcovTestMmap()44}45func main() {46    host := Host{}47    host.kcovTestMmap()48}49func main() {50    host := Host{}51    host.kcovTestMmap()52}

kcovTestMmap

Using AI Code Generation

1import "fmt"2import "syscall"3func main() {4    fmt.Println("Hello, world.")5    syscall.KcovTestMmap()6}7import "fmt"8import "syscall"9func main() {10    fmt.Println("Hello, world.")11    syscall.KcovTestMmap()12}13import "fmt"14import "syscall"15func main() {16    fmt.Println("Hello, world.")17    syscall.KcovTestMmap()18}19import "fmt"20import "syscall"21func main() {22    fmt.Println("Hello, world.")23    syscall.KcovTestMmap()24}25import "fmt"26import "syscall"27func main() {28    fmt.Println("Hello, world.")29    syscall.KcovTestMmap()30}31import "fmt"32import "syscall"33func main() {34    fmt.Println("Hello, world.")35    syscall.KcovTestMmap()36}37import "fmt"38import "syscall"39func main() {40    fmt.Println("Hello, world.")41    syscall.KcovTestMmap()42}43import "fmt"44import "syscall"45func main() {46    fmt.Println("Hello, world.")47    syscall.KcovTestMmap()48}49import "fmt"50import "syscall"51func main() {52    fmt.Println("Hello, world.")53    syscall.KcovTestMmap()54}55import "fmt"56import "syscall"57func main() {58    fmt.Println("Hello,

kcovTestMmap

Using AI Code Generation

1import (2func main() {3    pid := os.Getpid()4    fmt.Println("pid of the process is:", pid)5    process, _ := os.FindProcess(pid)6    processName, _ := process.Name()7    fmt.Println("process name is:", processName)8    processStatus, _ := process.Status()9    fmt.Println("process status is:", processStatus)10    processState, _ := process.Wait()11    fmt.Println("process state is:", processState)12    processUser, _ := process.User()13    fmt.Println("process user is:", processUser)14    processPpid, _ := process.Ppid()15    fmt.Println("process ppid is:", processPpid)16    processMemoryInfo, _ := process.MemoryInfo()17    fmt.Println("process memory info is:", processMemoryInfo)18    processCpuTimes, _ := process.Times()19    fmt.Println("process cpu times is:", processCpuTimes)20    processOpenFiles, _ := process.OpenFiles()21    fmt.Println("process open files is:", processOpenFiles)22    processConnections, _ := process.Connections()23    fmt.Println("process connections are:", processConnections)24    processThreads, _ := process.Threads()25    fmt.Println("process threads are:", processThreads)26    processChildren, _ := process.Children()27    fmt.Println("process children are:", processChildren)28    processEnviron, _ := process.Environ()29    fmt.Println("process environment is:", processEnviron)30    processIoCounters, _ := process.IOCounters()31    fmt.Println("process io counters are:", processIoCounters)32    processMemoryInfoEx, _ := process.MemoryInfoEx()33    fmt.Println("process memory info is

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