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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 rpcserver
import (
"context"
"fmt"
"io"
"os"
"os/exec"
"github.com/google/syzkaller/pkg/flatrpc"
"github.com/google/syzkaller/pkg/fuzzer/queue"
"github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/pkg/signal"
"github.com/google/syzkaller/pkg/vminfo"
"github.com/google/syzkaller/prog"
)
type LocalConfig struct {
Config
// syz-executor binary.
Executor string
// Temp dir where to run executor process, it's up to the caller to clean it up if necessary.
Dir string
// Handle ctrl+C and exit.
HandleInterrupts bool
// Run executor under gdb.
GDB bool
// Can be used to intercept stdout/stderr output.
OutputWriter io.Writer
MaxSignal []uint64
CoverFilter []uint64
MachineChecked func(features flatrpc.Feature, syscalls map[*prog.Syscall]bool) queue.Source
}
func RunLocal(ctx context.Context, cfg *LocalConfig) error {
localCtx, ctx, err := setupLocal(ctx, cfg)
if err != nil {
return err
}
defer localCtx.serv.Close()
// Note: we must not stop the RPC server before we finish RunInstance.
// Otherwise, RPC server will close the connection, and executor may SYZFAIL
// on the closed network connection.
// We first need to wait for the executor binary to finish, and only then stop the RPC server.
// However, we want to stop both if the other one errors out.
instCtx, instCancel := context.WithCancel(ctx)
defer instCancel()
servCtx, servCancel := context.WithCancel(context.Background())
defer servCancel()
servErr := make(chan error, 1)
go func() {
servErr <- localCtx.serv.Serve(servCtx)
instCancel()
}()
instErr := localCtx.RunInstance(instCtx, 0)
servCancel()
if err := <-servErr; err != nil {
return err
}
return instErr
}
func setupLocal(ctx context.Context, cfg *LocalConfig) (*local, context.Context, error) {
if cfg.VMArch == "" {
cfg.VMArch = cfg.Target.Arch
}
cfg.UseCoverEdges = true
cfg.FilterSignal = true
cfg.RPC = ":0"
cfg.PrintMachineCheck = log.V(1)
cfg.Stats = NewStats()
localCtx := &local{
cfg: cfg,
setupDone: make(chan bool),
}
serv := newImpl(&cfg.Config, localCtx)
if err := serv.Listen(); err != nil {
return nil, nil, err
}
localCtx.serv = serv
// setupDone synchronizes assignment to ctx.serv and read of ctx.serv in MachineChecked
// for the race detector b/c it does not understand the synchronization via TCP socket connect/accept.
close(localCtx.setupDone)
if cfg.HandleInterrupts {
ctx = cancelOnInterrupts(ctx)
}
return localCtx, ctx, nil
}
func cancelOnInterrupts(ctx context.Context) context.Context {
ret, cancel := context.WithCancel(ctx)
shutdown := make(chan struct{})
osutil.HandleInterrupts(shutdown)
go func() {
select {
case <-ctx.Done():
// Prevent goroutine leakage.
case <-shutdown:
cancel()
}
}()
return ret
}
type local struct {
cfg *LocalConfig
serv Server
setupDone chan bool
}
func (ctx *local) MachineChecked(features flatrpc.Feature, syscalls map[*prog.Syscall]bool) (queue.Source, error) {
<-ctx.setupDone
ctx.serv.TriagedCorpus()
return ctx.cfg.MachineChecked(features, syscalls), nil
}
func (ctx *local) BugFrames() ([]string, []string) {
return nil, nil
}
func (ctx *local) MaxSignal() signal.Signal {
return signal.FromRaw(ctx.cfg.MaxSignal, 0)
}
func (ctx *local) CoverageFilter(modules []*vminfo.KernelModule) ([]uint64, error) {
return ctx.cfg.CoverFilter, nil
}
func (ctx *local) Serve(context context.Context) error {
return ctx.serv.Serve(context)
}
func (ctx *local) RunInstance(baseCtx context.Context, id int) error {
connErr := ctx.serv.CreateInstance(id, nil, nil)
defer ctx.serv.ShutdownInstance(id, true)
cfg := ctx.cfg
bin := cfg.Executor
args := []string{"runner", fmt.Sprint(id), "localhost", fmt.Sprint(ctx.serv.Port())}
if cfg.GDB {
bin = "gdb"
args = append([]string{
"--return-child-result",
"--ex=handle SIGPIPE nostop",
"--args",
cfg.Executor,
}, args...)
}
cmd := exec.CommandContext(baseCtx, bin, args...)
cmd.Dir = cfg.Dir
if cfg.OutputWriter != nil {
cmd.Stdout = cfg.OutputWriter
cmd.Stderr = cfg.OutputWriter
} else if cfg.Debug || cfg.GDB {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
}
if cfg.GDB {
cmd.Stdin = os.Stdin
}
if err := cmd.Start(); err != nil {
return fmt.Errorf("failed to start executor: %w", err)
}
var retErr error
select {
case <-baseCtx.Done():
case err := <-connErr:
if err != nil {
retErr = fmt.Errorf("connection error: %w", err)
}
cmd.Process.Kill()
}
err := cmd.Wait()
if retErr == nil {
retErr = fmt.Errorf("executor process exited: %w", err)
}
// Note that we ignore the error if we killed the process because of the context.
if baseCtx.Err() == nil {
return retErr
}
return nil
}
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