mirror of
https://github.com/reactos/syzkaller.git
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01d1494471
Using a build tag to exclude files for golangci-lint reduces memory consumption (it does not parse them). The naive attempt with skip-dirs did not work. So add codeanalysis build tag and use it in auto-generated files. Update #977
320 lines
8.1 KiB
Go
320 lines
8.1 KiB
Go
// Copyright 2015/2016 syzkaller project authors. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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package main
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import (
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"bytes"
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"flag"
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"fmt"
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"go/format"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"runtime"
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"runtime/pprof"
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"sort"
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"strings"
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"sync"
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"text/template"
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"github.com/google/syzkaller/pkg/ast"
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"github.com/google/syzkaller/pkg/compiler"
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"github.com/google/syzkaller/pkg/hash"
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"github.com/google/syzkaller/pkg/osutil"
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"github.com/google/syzkaller/pkg/serializer"
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"github.com/google/syzkaller/prog"
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"github.com/google/syzkaller/sys/targets"
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)
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var (
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flagMemProfile = flag.String("memprofile", "", "write a memory profile to the file")
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)
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type SyscallData struct {
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Name string
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CallName string
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NR int32
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NeedCall bool
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}
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type ArchData struct {
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Revision string
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ForkServer int
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Shmem int
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GOARCH string
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PageSize uint64
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NumPages uint64
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DataOffset uint64
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Calls []SyscallData
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}
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type OSData struct {
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GOOS string
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Archs []ArchData
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}
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func main() {
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flag.Parse()
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var oses []OSData
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for OS, archs := range targets.List {
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top := ast.ParseGlob(filepath.Join("sys", OS, "*.txt"), nil)
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if top == nil {
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os.Exit(1)
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}
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osutil.MkdirAll(filepath.Join("sys", OS, "gen"))
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type Job struct {
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Target *targets.Target
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OK bool
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Errors []string
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Unsupported map[string]bool
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ArchData ArchData
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}
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var jobs []*Job
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for _, target := range archs {
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jobs = append(jobs, &Job{
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Target: target,
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})
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}
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sort.Slice(jobs, func(i, j int) bool {
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return jobs[i].Target.Arch < jobs[j].Target.Arch
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})
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var wg sync.WaitGroup
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wg.Add(len(jobs))
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for _, job := range jobs {
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job := job
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go func() {
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defer wg.Done()
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eh := func(pos ast.Pos, msg string) {
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job.Errors = append(job.Errors, fmt.Sprintf("%v: %v\n", pos, msg))
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}
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consts := compiler.DeserializeConstsGlob(filepath.Join("sys", OS, "*_"+job.Target.Arch+".const"), eh)
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if consts == nil {
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return
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}
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prog := compiler.Compile(top, consts, job.Target, eh)
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if prog == nil {
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return
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}
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job.Unsupported = prog.Unsupported
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sysFile := filepath.Join("sys", OS, "gen", job.Target.Arch+".go")
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out := new(bytes.Buffer)
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generate(job.Target, prog, consts, out)
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rev := hash.String(out.Bytes())
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fmt.Fprintf(out, "const revision_%v = %q\n", job.Target.Arch, rev)
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writeSource(sysFile, out.Bytes())
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job.ArchData = generateExecutorSyscalls(job.Target, prog.Syscalls, rev)
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job.OK = true
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}()
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}
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writeEmpty(OS)
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wg.Wait()
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var syscallArchs []ArchData
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unsupported := make(map[string]int)
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for _, job := range jobs {
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fmt.Printf("generating %v/%v...\n", job.Target.OS, job.Target.Arch)
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for _, msg := range job.Errors {
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fmt.Print(msg)
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}
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if !job.OK {
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os.Exit(1)
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}
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syscallArchs = append(syscallArchs, job.ArchData)
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for u := range job.Unsupported {
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unsupported[u]++
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}
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fmt.Printf("\n")
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}
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oses = append(oses, OSData{
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GOOS: OS,
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Archs: syscallArchs,
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})
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for what, count := range unsupported {
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if count == len(jobs) {
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failf("%v is unsupported on all arches (typo?)", what)
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}
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}
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}
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writeExecutorSyscalls(oses)
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if *flagMemProfile != "" {
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f, err := os.Create(*flagMemProfile)
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if err != nil {
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failf("could not create memory profile: ", err)
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}
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runtime.GC() // get up-to-date statistics
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if err := pprof.WriteHeapProfile(f); err != nil {
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failf("could not write memory profile: ", err)
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}
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f.Close()
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}
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}
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func generate(target *targets.Target, prg *compiler.Prog, consts map[string]uint64, out io.Writer) {
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tag := fmt.Sprintf("syz_target,syz_os_%v,syz_arch_%v", target.OS, target.Arch)
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if target.VMArch != "" {
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tag += fmt.Sprintf(" syz_target,syz_os_%v,syz_arch_%v", target.OS, target.VMArch)
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}
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fmt.Fprintf(out, "// AUTOGENERATED FILE\n")
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fmt.Fprintf(out, "// +build !codeanalysis\n")
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fmt.Fprintf(out, "// +build !syz_target %v\n\n", tag)
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fmt.Fprintf(out, "package gen\n\n")
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fmt.Fprintf(out, "import . \"github.com/google/syzkaller/prog\"\n")
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fmt.Fprintf(out, "import . \"github.com/google/syzkaller/sys/%v\"\n\n", target.OS)
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fmt.Fprintf(out, "func init() {\n")
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fmt.Fprintf(out, "\tRegisterTarget(&Target{"+
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"OS: %q, Arch: %q, Revision: revision_%v, PtrSize: %v, "+
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"PageSize: %v, NumPages: %v, DataOffset: %v, Syscalls: syscalls_%v, "+
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"Resources: resources_%v, Structs: structDescs_%v, Consts: consts_%v}, "+
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"InitTarget)\n}\n\n",
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target.OS, target.Arch, target.Arch, target.PtrSize,
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target.PageSize, target.NumPages, target.DataOffset,
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target.Arch, target.Arch, target.Arch, target.Arch)
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fmt.Fprintf(out, "var resources_%v = ", target.Arch)
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serializer.Write(out, prg.Resources)
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fmt.Fprintf(out, "\n\n")
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fmt.Fprintf(out, "var structDescs_%v = ", target.Arch)
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serializer.Write(out, prg.StructDescs)
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fmt.Fprintf(out, "\n\n")
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fmt.Fprintf(out, "var syscalls_%v = ", target.Arch)
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serializer.Write(out, prg.Syscalls)
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fmt.Fprintf(out, "\n\n")
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constArr := make([]prog.ConstValue, 0, len(consts))
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for name, val := range consts {
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constArr = append(constArr, prog.ConstValue{Name: name, Value: val})
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}
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sort.Slice(constArr, func(i, j int) bool {
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return constArr[i].Name < constArr[j].Name
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})
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fmt.Fprintf(out, "var consts_%v = ", target.Arch)
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serializer.Write(out, constArr)
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fmt.Fprintf(out, "\n\n")
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}
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func writeEmpty(OS string) {
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const data = `// AUTOGENERATED FILE
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// This file is needed if OS is completely excluded by build tags.
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package gen
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`
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writeSource(filepath.Join("sys", OS, "gen", "empty.go"), []byte(data))
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}
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func generateExecutorSyscalls(target *targets.Target, syscalls []*prog.Syscall, rev string) ArchData {
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data := ArchData{
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Revision: rev,
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GOARCH: target.Arch,
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PageSize: target.PageSize,
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NumPages: target.NumPages,
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DataOffset: target.DataOffset,
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}
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if target.ExecutorUsesForkServer {
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data.ForkServer = 1
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}
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if target.ExecutorUsesShmem {
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data.Shmem = 1
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}
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for _, c := range syscalls {
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data.Calls = append(data.Calls, SyscallData{
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Name: c.Name,
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CallName: c.CallName,
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NR: int32(c.NR),
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NeedCall: !target.SyscallNumbers || strings.HasPrefix(c.CallName, "syz_"),
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})
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}
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sort.Slice(data.Calls, func(i, j int) bool {
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return data.Calls[i].Name < data.Calls[j].Name
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})
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return data
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}
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func writeExecutorSyscalls(oses []OSData) {
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sort.Slice(oses, func(i, j int) bool {
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return oses[i].GOOS < oses[j].GOOS
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})
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buf := new(bytes.Buffer)
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if err := defsTempl.Execute(buf, oses); err != nil {
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failf("failed to execute defs template: %v", err)
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}
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writeFile(filepath.FromSlash("executor/defs.h"), buf.Bytes())
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buf.Reset()
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if err := syscallsTempl.Execute(buf, oses); err != nil {
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failf("failed to execute syscalls template: %v", err)
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}
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writeFile(filepath.FromSlash("executor/syscalls.h"), buf.Bytes())
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}
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func writeSource(file string, data []byte) {
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src, err := format.Source(data)
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if err != nil {
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fmt.Printf("%s\n", data)
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failf("failed to format output: %v", err)
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}
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if oldSrc, err := ioutil.ReadFile(file); err == nil && bytes.Equal(src, oldSrc) {
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return
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}
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writeFile(file, src)
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}
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func writeFile(file string, data []byte) {
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outf, err := os.Create(file)
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if err != nil {
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failf("failed to create output file: %v", err)
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}
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defer outf.Close()
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outf.Write(data)
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}
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func failf(msg string, args ...interface{}) {
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fmt.Fprintf(os.Stderr, msg+"\n", args...)
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os.Exit(1)
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}
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var defsTempl = template.Must(template.New("").Parse(`// AUTOGENERATED FILE
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{{range $os := $}}
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#if GOOS_{{$os.GOOS}}
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#define GOOS "{{$os.GOOS}}"
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{{range $arch := $os.Archs}}
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#if GOARCH_{{$arch.GOARCH}}
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#define GOARCH "{{.GOARCH}}"
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#define SYZ_REVISION "{{.Revision}}"
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#define SYZ_EXECUTOR_USES_FORK_SERVER {{.ForkServer}}
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#define SYZ_EXECUTOR_USES_SHMEM {{.Shmem}}
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#define SYZ_PAGE_SIZE {{.PageSize}}
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#define SYZ_NUM_PAGES {{.NumPages}}
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#define SYZ_DATA_OFFSET {{.DataOffset}}
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#endif
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{{end}}
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#endif
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{{end}}
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`))
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var syscallsTempl = template.Must(template.New("").Parse(`// AUTOGENERATED FILE
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{{range $os := $}}
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#if GOOS_{{$os.GOOS}}
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{{range $arch := $os.Archs}}
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#if GOARCH_{{$arch.GOARCH}}
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const call_t syscalls[] = {
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{{range $c := $arch.Calls}} {"{{$c.Name}}", {{$c.NR}}{{if $c.NeedCall}}, (syscall_t){{$c.CallName}}{{end}}},
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{{end}}
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};
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#endif
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{{end}}
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#endif
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{{end}}
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`))
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