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// Copyright 2021 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 main
import (
"fmt"
"io"
"os"
"os/signal"
"sort"
"time"
"github.com/google/syzkaller/prog"
)
// Stats encapsulates data for creating statistics related to the results
// of the verification process.
type Stats struct {
// Calls stores statistics for all supported system calls.
Calls map[string]*CallStats
TotalMismatches int
Progs int
StartTime time.Time
}
// CallStats stores information used to generate statistics for the
// system call.
type CallStats struct {
// Name is the system call name.
Name string
// Mismatches stores the number of errno mismatches identifed in the
// verified programs for this system call.
Mismatches int
// Occurrences is the number of times the system call appeared in a
// verified program.
Occurrences int
// States stores the kernel return state that caused mismatches.
States map[ReturnState]bool
}
// InitStats creates a stats object that will report verification
// statistics when an os.Interrupt occurs.
func InitStats(calls map[*prog.Syscall]bool, w io.Writer) *Stats {
s := &Stats{
Calls: make(map[string]*CallStats),
StartTime: time.Now(),
}
for c := range calls {
s.Calls[c.Name] = &CallStats{
Name: c.Name,
States: make(map[ReturnState]bool)}
}
c := make(chan os.Signal)
signal.Notify(c, os.Interrupt)
go func() {
<-c
dt := time.Since(s.StartTime).Minutes()
if s.TotalMismatches < 0 {
fmt.Fprint(w, "No mismatches occurred until syz-verifier was stopped.")
os.Exit(0)
}
s.ReportGlobalStats(w, dt)
os.Exit(0)
}()
return s
}
// ReportCallStats creates a report with the current statistics for call.
func (s *Stats) ReportCallStats(call string) string {
cs, ok := s.Calls[call]
if !ok {
return ""
}
name, m, o := cs.Name, cs.Mismatches, cs.Occurrences
data := fmt.Sprintf("statistics for %s:\n"+
"\t↳ mismatches of %s / occurrences of %s: %d / %d (%0.2f %%)\n"+
"\t↳ mismatches of %s / total number of mismatches: "+
"%d / %d (%0.2f %%)\n"+
"\t↳ %d distinct states identified: %v\n", name, name, name, m, o,
getPercentage(m, o), name, m, s.TotalMismatches,
getPercentage(m, s.TotalMismatches), len(cs.States), s.getOrderedStates(name))
return data
}
func getPercentage(value, total int) float64 {
return float64(value) / float64(total) * 100
}
// ReportGlobalStats creates a report with statistics about all the
// supported system calls for which errno mismatches were identified in
// the verified programs, shown in decreasing order.
func (s *Stats) ReportGlobalStats(w io.Writer, deltaTime float64) {
tc := s.totalCallsExecuted()
fmt.Fprintf(w, "total number of mismatches / total number of calls "+
"executed: %d / %d (%0.2f %%)\n\n", s.TotalMismatches, tc, getPercentage(s.TotalMismatches, tc))
fmt.Fprintf(w, "programs / minute: %0.2f\n\n", float64(s.Progs)/deltaTime)
cs := s.getOrderedStats()
for _, c := range cs {
fmt.Fprintf(w, "%s\n", s.ReportCallStats(c.Name))
}
}
func (s *Stats) totalCallsExecuted() int {
t := 0
for _, cs := range s.Calls {
t += cs.Occurrences
}
return t
}
func (s *Stats) getOrderedStats() []*CallStats {
css := make([]*CallStats, 0)
for _, cs := range s.Calls {
if cs.Mismatches > 0 {
css = append(css, cs)
}
}
sort.Slice(css, func(i, j int) bool {
return getPercentage(css[i].Mismatches, css[i].Occurrences) > getPercentage(css[j].Mismatches, css[j].Occurrences)
})
return css
}
func (s *Stats) getOrderedStates(call string) []string {
states := s.Calls[call].States
ss := make([]string, 0, len(states))
for s := range states {
ss = append(ss, fmt.Sprintf("%q", s))
}
sort.Strings(ss)
return ss
}
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