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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"
"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"
"golang.org/x/sync/errgroup"
)
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
MaxSignal []uint64
CoverFilter []uint64
// RunLocal exits when the context is cancelled.
Context context.Context
MachineChecked func(features flatrpc.Feature, syscalls map[*prog.Syscall]bool) queue.Source
}
func RunLocal(cfg *LocalConfig) error {
if cfg.VMArch == "" {
cfg.VMArch = cfg.Target.Arch
}
if cfg.Context == nil {
cfg.Context = context.Background()
}
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 err
}
defer serv.Close()
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)
cancelCtx, cancel := context.WithCancel(cfg.Context)
eg, ctx := errgroup.WithContext(cancelCtx)
const id = 0
connErr := serv.CreateInstance(id, nil, nil)
defer serv.ShutdownInstance(id, true)
bin := cfg.Executor
args := []string{"runner", fmt.Sprint(id), "localhost", fmt.Sprint(serv.Port())}
if cfg.GDB {
bin = "gdb"
args = append([]string{
"--return-child-result",
"--ex=handle SIGPIPE nostop",
"--args",
cfg.Executor,
}, args...)
}
cmd := exec.CommandContext(ctx, bin, args...)
cmd.Dir = cfg.Dir
if cfg.Debug || cfg.GDB {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
}
if cfg.GDB {
cmd.Stdin = os.Stdin
}
eg.Go(func() error {
return serv.Serve(ctx)
})
eg.Go(func() error {
if err := cmd.Start(); err != nil {
return fmt.Errorf("failed to start executor: %w", err)
}
err := cmd.Wait()
// Note that we ignore the error if we killed the process by closing the context.
if err == nil || ctx.Err() != nil {
return nil
}
return fmt.Errorf("executor process exited: %w", err)
})
shutdown := make(chan struct{})
if cfg.HandleInterrupts {
osutil.HandleInterrupts(shutdown)
}
select {
case <-ctx.Done():
case <-shutdown:
case <-connErr:
}
cancel()
return eg.Wait()
}
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
}
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