How to use simplifyC method of repro Package

Best Syzkaller code snippet using repro.simplifyC

repro.go

Source:repro.go

...202		}203	}204	// Simplify C related options.205	if res.CRepro {206		res, err = ctx.simplifyC(res)207		if err != nil {208			return nil, err209		}210	}211	return res, nil212}213func (ctx *context) extractProg(entries []*prog.LogEntry) (*Result, error) {214	ctx.reproLog(2, "extracting reproducer from %v programs", len(entries))215	start := time.Now()216	defer func() {217		ctx.stats.ExtractProgTime = time.Since(start)218	}()219	// Extract last program on every proc.220	procs := make(map[int]int)221	for i, ent := range entries {222		procs[ent.Proc] = i223	}224	var indices []int225	for _, idx := range procs {226		indices = append(indices, idx)227	}228	sort.Ints(indices)229	var lastEntries []*prog.LogEntry230	for i := len(indices) - 1; i >= 0; i-- {231		lastEntries = append(lastEntries, entries[indices[i]])232	}233	// The shortest duration is 10 seconds to detect simple crashes (i.e. no races and no hangs).234	// The longest duration is 5 minutes to catch races and hangs. Note that this value must be larger235	// than hang/no output detection duration in vm.MonitorExecution, which is currently set to 3 mins.236	timeouts := []time.Duration{10 * time.Second, 1 * time.Minute, 5 * time.Minute}237	for _, timeout := range timeouts {238		// Execute each program separately to detect simple crashes caused by a single program.239		// Programs are executed in reverse order, usually the last program is the guilty one.240		res, err := ctx.extractProgSingle(reverseEntries(lastEntries), timeout)241		if err != nil {242			return nil, err243		}244		if res != nil {245			ctx.reproLog(3, "found reproducer with %d syscalls", len(res.Prog.Calls))246			return res, nil247		}248		// Don't try bisecting if there's only one entry.249		if len(entries) == 1 {250			continue251		}252		// Execute all programs and bisect the log to find multiple guilty programs.253		res, err = ctx.extractProgBisect(reverseEntries(entries), timeout)254		if err != nil {255			return nil, err256		}257		if res != nil {258			ctx.reproLog(3, "found reproducer with %d syscalls", len(res.Prog.Calls))259			return res, nil260		}261	}262	ctx.reproLog(0, "failed to extract reproducer")263	return nil, nil264}265func (ctx *context) createDefaultOps() csource.Options {266	opts := csource.Options{267		Threaded:      true,268		Collide:       true,269		Repeat:        true,270		Procs:         ctx.cfg.Procs,271		Sandbox:       ctx.cfg.Sandbox,272		EnableTun:     true,273		EnableCgroups: true,274		EnableNetdev:  true,275		ResetNet:      true,276		UseTmpDir:     true,277		HandleSegv:    true,278		WaitRepeat:    true,279		Repro:         true,280	}281	return opts282}283func (ctx *context) extractProgSingle(entries []*prog.LogEntry, duration time.Duration) (*Result, error) {284	ctx.reproLog(3, "single: executing %d programs separately with timeout %s", len(entries), duration)285	opts := ctx.createDefaultOps()286	for _, ent := range entries {287		opts.Fault = ent.Fault288		opts.FaultCall = ent.FaultCall289		opts.FaultNth = ent.FaultNth290		if opts.FaultCall < 0 || opts.FaultCall >= len(ent.P.Calls) {291			opts.FaultCall = len(ent.P.Calls) - 1292		}293		crashed, err := ctx.testProg(ent.P, duration, opts)294		if err != nil {295			return nil, err296		}297		if crashed {298			res := &Result{299				Prog:     ent.P,300				Duration: duration * 3 / 2,301				Opts:     opts,302			}303			ctx.reproLog(3, "single: successfully extracted reproducer")304			return res, nil305		}306	}307	ctx.reproLog(3, "single: failed to extract reproducer")308	return nil, nil309}310func (ctx *context) extractProgBisect(entries []*prog.LogEntry, baseDuration time.Duration) (*Result, error) {311	ctx.reproLog(3, "bisect: bisecting %d programs with base timeout %s", len(entries), baseDuration)312	opts := ctx.createDefaultOps()313	duration := func(entries int) time.Duration {314		return baseDuration + time.Duration((entries/4))*time.Second315	}316	// Bisect the log to find multiple guilty programs.317	entries, err := ctx.bisectProgs(entries, func(progs []*prog.LogEntry) (bool, error) {318		return ctx.testProgs(progs, duration(len(progs)), opts)319	})320	if err != nil {321		return nil, err322	}323	if len(entries) == 0 {324		return nil, nil325	}326	// TODO: Minimize each program before concatenation.327	// TODO: Return multiple programs if concatenation fails.328	ctx.reproLog(3, "bisect: %d programs left: \n\n%s\n", len(entries), encodeEntries(entries))329	ctx.reproLog(3, "bisect: trying to concatenate")330	// Concatenate all programs into one.331	prog := &prog.Prog{332		Target: entries[0].P.Target,333	}334	for _, entry := range entries {335		prog.Calls = append(prog.Calls, entry.P.Calls...)336	}337	dur := duration(len(entries)) * 3 / 2338	// Execute the program without fault injection.339	crashed, err := ctx.testProg(prog, dur, opts)340	if err != nil {341		return nil, err342	}343	if crashed {344		res := &Result{345			Prog:     prog,346			Duration: dur,347			Opts:     opts,348		}349		ctx.reproLog(3, "bisect: concatenation succeeded")350		return res, nil351	}352	// Try with fault injection.353	calls := 0354	for _, entry := range entries {355		if entry.Fault {356			opts.FaultCall = calls + entry.FaultCall357			opts.FaultNth = entry.FaultNth358			if entry.FaultCall < 0 || entry.FaultCall >= len(entry.P.Calls) {359				opts.FaultCall = calls + len(entry.P.Calls) - 1360			}361			crashed, err := ctx.testProg(prog, dur, opts)362			if err != nil {363				return nil, err364			}365			if crashed {366				res := &Result{367					Prog:     prog,368					Duration: dur,369					Opts:     opts,370				}371				ctx.reproLog(3, "bisect: concatenation succeeded with fault injection")372				return res, nil373			}374		}375		calls += len(entry.P.Calls)376	}377	ctx.reproLog(3, "bisect: concatenation failed")378	return nil, nil379}380// Minimize calls and arguments.381func (ctx *context) minimizeProg(res *Result) (*Result, error) {382	ctx.reproLog(2, "minimizing guilty program")383	start := time.Now()384	defer func() {385		ctx.stats.MinimizeProgTime = time.Since(start)386	}()387	call := -1388	if res.Opts.Fault {389		call = res.Opts.FaultCall390	}391	res.Prog, res.Opts.FaultCall = prog.Minimize(res.Prog, call, true,392		func(p1 *prog.Prog, callIndex int) bool {393			crashed, err := ctx.testProg(p1, res.Duration, res.Opts)394			if err != nil {395				ctx.reproLog(0, "minimization failed with %v", err)396				return false397			}398			return crashed399		})400	return res, nil401}402// Simplify repro options (threaded, collide, sandbox, etc).403func (ctx *context) simplifyProg(res *Result) (*Result, error) {404	ctx.reproLog(2, "simplifying guilty program")405	start := time.Now()406	defer func() {407		ctx.stats.SimplifyProgTime = time.Since(start)408	}()409	for _, simplify := range progSimplifies {410		opts := res.Opts411		if simplify(&opts) {412			crashed, err := ctx.testProg(res.Prog, res.Duration, opts)413			if err != nil {414				return nil, err415			}416			if crashed {417				res.Opts = opts418				// Simplification successful, try extracting C repro.419				res, err := ctx.extractC(res)420				if err != nil {421					return nil, err422				}423				if res.CRepro {424					return res, nil425				}426			}427		}428	}429	return res, nil430}431// Try triggering crash with a C reproducer.432func (ctx *context) extractC(res *Result) (*Result, error) {433	ctx.reproLog(2, "extracting C reproducer")434	start := time.Now()435	defer func() {436		ctx.stats.ExtractCTime = time.Since(start)437	}()438	crashed, err := ctx.testCProg(res.Prog, res.Duration, res.Opts)439	if err != nil {440		return nil, err441	}442	res.CRepro = crashed443	return res, nil444}445// Try to simplify the C reproducer.446func (ctx *context) simplifyC(res *Result) (*Result, error) {447	ctx.reproLog(2, "simplifying C reproducer")448	start := time.Now()449	defer func() {450		ctx.stats.SimplifyCTime = time.Since(start)451	}()452	for _, simplify := range cSimplifies {453		opts := res.Opts454		if simplify(&opts) {455			crashed, err := ctx.testCProg(res.Prog, res.Duration, opts)456			if err != nil {457				return nil, err458			}459			if crashed {460				res.Opts = opts...

simplifyC

Using AI Code Generation

1import (2type repro struct {3}4func (r *repro) simplifyC() {5    if r.c != 0 {6    }7}8func main() {9    r := repro{1, 2, 3}10    r.simplifyC()11    fmt.Println(r)12}13import (14type repro struct {15}16func (r *repro) simplifyC() {17    if r.c != 0 {18    }19}20func main() {21    r := repro{a: 1, b: 2, c: 3}22    r.simplifyC()23    fmt.Println(r)24}

simplifyC

Using AI Code Generation

1import "fmt"2type repro struct {3}4func (r repro) simplifyC() repro {5}6func main() {7    r := repro{a: 1}8    fmt.Println(r.simplifyC())9}10import "fmt"11type repro struct {12}13func (r *repro) simplifyC() *repro {14}15func main() {16    r := repro{a: 1}17    fmt.Println(r.simplifyC())18}19import "fmt"20type repro struct {21}22func (r repro) simplifyC() repro {23}24func main() {25    r := repro{a: 1}26    fmt.Println(&r.simplifyC())27}28import "fmt"29type repro struct {30}31func (r *repro) simplifyC() *repro {32}33func main() {34    r := repro{a: 1}35    fmt.Println(&r.simplifyC())36}37import "fmt"38type repro struct {39}40func (r repro) simplifyC() repro {41}42func main() {43    r := repro{a: 1}44    fmt.Println(r.simplifyC().a)45}46import "fmt"47type repro struct {48}49func (r *repro) simplifyC() *repro {50}51func main() {52    r := repro{a: 1}53    fmt.Println(r.simplifyC().a)54}55import "fmt"56type repro struct {57}58func (r repro) simplifyC() repro {59}60func main() {61    r := repro{a: 1}

simplifyC

Using AI Code Generation

1import (2func main() {3    fmt.Scan(&n, &m)4    for i := 0; i < n; i++ {5        for j := 0; j < m; j++ {6            fmt.Scan(&a[i][j])7        }8    }9    r.simplifyC(a, n, m)10}11type repro struct {12}13func (r *repro) simplifyC(a [100][100]int, n, m int) {14    r.simplify()15}16func (r *repro) simplify() {17    for i := 0; i < r.n; i++ {18        for j := 0; j < r.m; j++ {19            if r.a[i][j] == 0 {20            } else {21            }22        }23    }24    for i := 0; i < r.n; i++ {25        for j := 0; j < r.m; j++ {26            fmt.Print(r.a[i][j], " ")27        }28        fmt.Println()29    }30}

simplifyC

Using AI Code Generation

1import (2func main() {3    fmt.Println(repro.SimplifyC("test"))4}5import (6func main() {7    fmt.Println(repro.SimplifyC("test"))8}9import (10func main() {11    fmt.Println(repro.SimplifyC("test"))12}13import (14func main() {15    fmt.Println(repro.SimplifyC("test"))16}17import (18func main() {19    fmt.Println(repro.SimplifyC("test"))20}21import (22func main() {23    fmt.Println(repro.SimplifyC("test"))24}25import (26func main() {27    fmt.Println(repro.SimplifyC("test"))28}29import (30func main() {31    fmt.Println(repro.SimplifyC("test"))32}33import (34func main() {35    fmt.Println(repro.SimplifyC("test"))36}37import (

simplifyC

Using AI Code Generation

1import (2func main() {3	fmt.Println("Hello, playground")4	a.SimplifyC()5}6type A struct {7}8func (a *A) SimplifyC() {9}10import "testing"11func TestSimplifyC(t *testing.T) {12	a.SimplifyC()13}

simplifyC

Using AI Code Generation

1import (2func main() {3	fmt.Println("Hello, playground")4	s := repro.NewSimplifier()5	s.SimplifyC()6}7import "fmt"8type Simplifier struct {9}10func NewSimplifier() *Simplifier {11	return &Simplifier{}12}13func (s *Simplifier) SimplifyC() {14	fmt.Println("simplifyC")15}16import "testing"17func TestSimplifier_SimplifyC(t *testing.T) {18	s := NewSimplifier()19	s.SimplifyC()20}

simplifyC

Using AI Code Generation

1import (2type Repro struct {3}4func (r *Repro) simplifyC(input string) string {5	input = strings.Replace(input, " ", "", -1)6	input = strings.Replace(input, "\t", "", -1)7	input = strings.Replace(input, "8	input = strings.Replace(input, "\r", "", -1)9	for {10		start := strings.Index(input, "/*")11		if start == -1 {12		}13		end := strings.Index(input, "*/")14		if end == -1 {15		}16	}17	for {18		if start == -1 {19		}20		end := strings.Index(input[start:], "21		if end == -1 {22		}23	}24	for {25		start := strings.Index(input, "#")26		if start == -1 {27		}28		end := strings.Index(input[start:], "29		if end == -1 {30		}31	}32}33func main() {34	repro := Repro{}

simplifyC

Using AI Code Generation

1import (2func main() {3    fmt.Println(repro.SimplifyC("Hello, World!"))4}5    /usr/local/go/src/github.com/yourname/repro (from $GOROOT)6    /home/yourname/go/src/github.com/yourname/repro (from $GOPATH)

simplifyC

Using AI Code Generation

1import (2func main() {3 fmt.Println("Hello, playground")4 r := repro.NewRepro()5 fmt.Println(r.SimplifyC("a+b*c"))6}

simplifyC

Using AI Code Generation

1import (2func main() {3	s := repro.SimplifyC("a+b+c+d")4	fmt.Printf("s=%s5}6import (7func main() {8	s := repro.Simplify("a+b+c+d")9	fmt.Printf("s=%s10}11import (12func Simplify(s string) string {13	return simplify(s)14}15func SimplifyC(s string) string {16	return simplify(s)17}18func simplify(s string) string {19	return strings.Replace(s, "+", "", -1)20}21import (22func TestSimplify(t *testing.T) {23	s := Simplify("a+b+c+d")24	if s != "abcd" {25		t.Errorf("Simplify failed")26	}27}28func TestSimplifyC(t *testing.T) {29	s := SimplifyC("a+b+c+d")30	if s != "abcd" {31		t.Errorf("SimplifyC failed")32	}33}34    /usr/local/go/src/github.com/pschlump/repro (from $GOROOT)35    /home/pschlump/go/src/github.com/pschlump/repro (from $GOPATH)36    /usr/local/go/src/github.com/pschlump/repro (from $GOROOT)

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