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// Copyright 2025 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 kernel
import (
"path/filepath"
"sync"
"time"
"github.com/google/syzkaller/pkg/aflow"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/pkg/vcs"
"github.com/google/syzkaller/sys/targets"
)
// Checkout action checks out the Linux kernel on the given commit,
// outputs the source directory with the checkout.
var Checkout = aflow.NewFuncAction("kernel-checkouter", checkout)
type checkoutArgs struct {
KernelRepo string
KernelCommit string
}
type checkoutResult struct {
// Directory with the checked out sources.
KernelSrc string
}
func checkout(ctx *aflow.Context, args checkoutArgs) (checkoutResult, error) {
var res checkoutResult
err := UseLinuxRepo(ctx, func(kernelRepoDir string, repo vcs.Repo) error {
dir, err := ctx.Cache("src", args.KernelCommit, func(dir string) error {
if _, err := repo.SwitchCommit(args.KernelCommit); err != nil {
if _, err := repo.CheckoutCommit(args.KernelRepo, args.KernelCommit); err != nil {
return err
}
}
// The following commit breaks compile_commands.json by adding bogus commands that fail.
// There is no easy way to filter out these bogus commands, so we revert the commit.
const (
// scripts/clang-tools: Handle included .c files in gen_compile_commands
badCommit = "9362d34acf91a706c543d919ade3e651b9bd2d6f"
// Revert "scripts/clang-tools: Handle included .c files in gen_compile_commands"
revertCommit = "07fe35b766a6fcd4ec8214e5066b7b0056b6ec6a"
)
if ok, err := repo.Contains(revertCommit); err != nil {
return err
} else if !ok {
if ok, err := repo.Contains(badCommit); err != nil {
return err
} else if ok {
if _, err = osutil.RunCmd(time.Hour, kernelRepoDir,
"git", "revert", "--no-edit", badCommit); err != nil {
return err
}
}
}
if _, err := osutil.RunCmd(time.Hour, dir, "git", "init"); err != nil {
return err
}
if _, err := osutil.RunCmd(time.Hour, dir, "git", "remote", "add", "origin", kernelRepoDir); err != nil {
return err
}
if _, err := osutil.RunCmd(time.Hour, dir, "git", "pull", "origin", "HEAD", "--depth=1",
"--allow-unrelated-histories"); err != nil {
return err
}
return nil
})
res.KernelSrc = dir
return err
})
return res, err
}
var repoMu sync.Mutex
func UseLinuxRepo(ctx *aflow.Context, fn func(string, vcs.Repo) error) error {
repoMu.Lock()
defer repoMu.Unlock()
kernelRepoDir := filepath.Join(ctx.Workdir, "repo", targets.Linux)
repo, err := vcs.NewRepo(targets.Linux, "", kernelRepoDir)
if err != nil {
return err
}
return fn(kernelRepoDir, repo)
}
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