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akaros.go
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akaros.go
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// Copyright 2018 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 report
import (
"bufio"
"bytes"
"fmt"
"path/filepath"
"regexp"
"strconv"
"strings"
"github.com/google/syzkaller/pkg/symbolizer"
)
type akaros struct {
ignores []*regexp.Regexp
objfile string
}
func ctorAkaros(kernelSrc, kernelObj string, ignores []*regexp.Regexp) (Reporter, []string, error) {
ctx := &akaros{
ignores: ignores,
objfile: filepath.Join(kernelObj, "akaros-kernel-64b"),
}
return ctx, nil, nil
}
func (ctx *akaros) ContainsCrash(output []byte) bool {
return containsCrash(output, akarosOopses, ctx.ignores)
}
func (ctx *akaros) Parse(output []byte) *Report {
rep := simpleLineParser(output, akarosOopses, akarosStackParams, ctx.ignores)
if rep == nil {
return nil
}
rep.Report = ctx.minimizeReport(rep.Report)
return rep
}
func (ctx *akaros) Symbolize(rep *Report) error {
symb := symbolizer.NewSymbolizer()
defer symb.Close()
var symbolized []byte
s := bufio.NewScanner(bytes.NewReader(rep.Report))
for s.Scan() {
line := bytes.Trim(s.Bytes(), "\r")
line = ctx.symbolizeLine(symb.Symbolize, ctx.objfile, line)
symbolized = append(symbolized, line...)
symbolized = append(symbolized, '\n')
}
rep.Report = symbolized
return nil
}
func (ctx *akaros) symbolizeLine(symbFunc func(bin string, pc uint64) ([]symbolizer.Frame, error),
objfile string, line []byte) []byte {
match := akarosSymbolizeRe.FindSubmatchIndex(line)
if match == nil {
return line
}
addr, err := strconv.ParseUint(string(line[match[2]:match[3]]), 0, 64)
if err != nil {
return line
}
frames, err := symbFunc(objfile, addr-1)
if err != nil || len(frames) == 0 {
return line
}
var symbolized []byte
for i, frame := range frames {
if i != 0 {
symbolized = append(symbolized, '\n')
}
file := frame.File
if pos := strings.LastIndex(file, "/kern/"); pos != -1 {
file = file[pos+6:]
}
modified := append([]byte{}, line...)
modified = append(modified, fmt.Sprintf(" at %v:%v", file, frame.Line)...)
if frame.Inline {
modified = replace(modified, match[4], match[5], []byte(frame.Func))
modified = replace(modified, match[2], match[3], []byte(" [inline] "))
}
symbolized = append(symbolized, modified...)
}
return symbolized
}
func (ctx *akaros) minimizeReport(report []byte) []byte {
out := new(bytes.Buffer)
for s := bufio.NewScanner(bytes.NewReader(report)); s.Scan(); {
line := bytes.Trim(s.Bytes(), "\r")
if len(line) == 0 ||
bytes.Contains(line, []byte("Entering Nanwan's Dungeon")) ||
bytes.Contains(line, []byte("Type 'help' for a list of commands")) {
continue
}
out.Write(line)
out.WriteByte('\n')
}
return out.Bytes()
}
var (
akarosSymbolizeRe = compile(`^#[0-9]+ \[\<(0x[0-9a-f]+)\>\] in ([a-zA-Z0-9_]+)`)
akarosBacktraceRe = compile(`(?:Stack Backtrace|Backtrace of kernel context) on Core [0-9]+:`)
)
var akarosStackParams = &stackParams{
stackStartRes: []*regexp.Regexp{
akarosBacktraceRe,
},
frameRes: []*regexp.Regexp{
compile(`^#[0-9]+ {{PC}} in ([a-zA-Z0-9_]+)`),
},
skipPatterns: []string{
"backtrace",
"mon_backtrace",
"monitor",
"_panic",
"_warn",
},
}
var akarosOopses = []*oops{
{
[]byte("kernel panic"),
[]oopsFormat{
{
title: compile("kernel panic at {{SRC}}, from core [0-9]+: assertion failed: (.*)"),
fmt: "assertion failed: %[2]v",
stack: &stackFmt{
parts: []*regexp.Regexp{
akarosBacktraceRe,
parseStackTrace,
},
},
},
{
title: compile("kernel panic at {{SRC}}, from core [0-9]+: (.*)"),
fmt: "kernel panic: %[2]v",
stack: &stackFmt{
parts: []*regexp.Regexp{
akarosBacktraceRe,
parseStackTrace,
},
},
},
{
title: compile("kernel panic"),
fmt: "kernel panic",
noStackTrace: true,
corrupted: true,
},
},
[]*regexp.Regexp{},
},
{
[]byte("kernel warning"),
[]oopsFormat{
{
title: compile("kernel warning at {{SRC}}, from core [0-9]+"),
fmt: "kernel warning in %[2]v",
stack: &stackFmt{
parts: []*regexp.Regexp{
akarosBacktraceRe,
parseStackTrace,
},
},
},
{
title: compile("kernel warning"),
fmt: "kernel warning",
noStackTrace: true,
corrupted: true,
},
},
[]*regexp.Regexp{},
},
}