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// Copyright 2024 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 manager
import (
"fmt"
"path/filepath"
"sync"
"time"
"github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/pkg/osutil"
)
type DiffBug struct {
Title string
Base DiffBugInfo
Patched DiffBugInfo
}
func (bug DiffBug) PatchedOnly() bool {
return bug.Base.NotCrashed && bug.Patched.Crashes > 0
}
func (bug DiffBug) AffectsBoth() bool {
return bug.Base.Crashes > 0 && bug.Patched.Crashes > 0
}
type DiffBugInfo struct {
Crashes int // Count of detected crashes.
NotCrashed bool // If were proven not to crash by running a repro.
// File paths.
Report string
Repro string
ReproLog string
CrashLog string
}
// DiffFuzzerStore provides the functionality of a database of the patch fuzzing.
type DiffFuzzerStore struct {
BasePath string
mu sync.Mutex
bugs map[string]*DiffBug
}
func (s *DiffFuzzerStore) BaseCrashed(title string, report []byte) {
s.patch(title, func(obj *DiffBug) {
obj.Base.Crashes++
if len(report) > 0 {
obj.Base.Report = s.saveFile(title, "base_report", report)
}
})
}
func (s *DiffFuzzerStore) EverCrashedBase(title string) bool {
s.mu.Lock()
defer s.mu.Unlock()
obj := s.bugs[title]
return obj != nil && obj.Base.Crashes > 0
}
func (s *DiffFuzzerStore) BaseNotCrashed(title string) {
s.patch(title, func(obj *DiffBug) {
if obj.Base.Crashes == 0 {
obj.Base.NotCrashed = true
}
})
}
func (s *DiffFuzzerStore) PatchedCrashed(title string, report, log []byte) {
s.patch(title, func(obj *DiffBug) {
obj.Patched.Crashes++
if len(report) > 0 {
obj.Patched.Report = s.saveFile(title, "patched_report", report)
}
if len(log) > 0 && obj.Patched.CrashLog == "" {
obj.Patched.CrashLog = s.saveFile(title, "patched_crash_log", log)
}
})
}
func (s *DiffFuzzerStore) SaveRepro(result *ReproResult) {
title := result.Crash.Report.Title
if result.Repro != nil {
// If there's a repro, save under the new title.
title = result.Repro.Report.Title
}
now := time.Now().Unix()
crashLog := fmt.Sprintf("%v.crash.log", now)
s.saveFile(title, crashLog, result.Crash.Output)
log.Logf(0, "%q: saved crash log into %s", title, crashLog)
s.patch(title, func(obj *DiffBug) {
if result.Repro != nil {
obj.Patched.Repro = s.saveFile(title, reproFileName, result.Repro.Prog.Serialize())
}
if result.Stats != nil {
reproLog := fmt.Sprintf("%v.repro.log", now)
obj.Patched.ReproLog = s.saveFile(title, reproLog, result.Stats.FullLog())
log.Logf(0, "%q: saved repro log into %s", title, reproLog)
}
})
}
func (s *DiffFuzzerStore) List() []DiffBug {
s.mu.Lock()
defer s.mu.Unlock()
var list []DiffBug
for _, obj := range s.bugs {
list = append(list, *obj)
}
return list
}
func (s *DiffFuzzerStore) saveFile(title, name string, data []byte) string {
hash := crashHash(title)
path := filepath.Join(s.BasePath, "crashes", hash)
osutil.MkdirAll(path)
osutil.WriteFile(filepath.Join(path, name), data)
return filepath.Join("crashes", hash, name)
}
func (s *DiffFuzzerStore) patch(title string, cb func(*DiffBug)) {
s.mu.Lock()
defer s.mu.Unlock()
if s.bugs == nil {
s.bugs = map[string]*DiffBug{}
}
obj, ok := s.bugs[title]
if !ok {
obj = &DiffBug{Title: title}
s.bugs[title] = obj
}
cb(obj)
}
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