mirror of
https://github.com/reactos/syzkaller.git
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105 lines
3.5 KiB
Go
105 lines
3.5 KiB
Go
// Copyright 2017 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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//go:generate bash -c "echo -en '// AUTOGENERATED FILE\n\n' > generated.go"
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//go:generate bash -c "echo -en 'package kernel\n\n' >> generated.go"
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//go:generate bash -c "echo -en 'const createImageScript = `#!/bin/bash\n' >> generated.go"
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//go:generate bash -c "cat ../../tools/create-gce-image.sh | grep -v '#' >> generated.go"
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//go:generate bash -c "echo -en '`\n\n' >> generated.go"
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// Package kernel contains helper functions for working with Linux kernel
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// (building kernel/image).
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package kernel
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import (
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"fmt"
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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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"strconv"
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"strings"
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"time"
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"github.com/google/syzkaller/pkg/osutil"
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)
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func Build(dir, compiler, config string) error {
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configFile := filepath.Join(dir, ".config")
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if err := osutil.CopyFile(config, configFile); err != nil {
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return fmt.Errorf("failed to write config file: %v", err)
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}
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if err := osutil.SandboxChown(configFile); err != nil {
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return err
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}
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cmd := osutil.Command("make", "olddefconfig")
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if err := osutil.Sandbox(cmd, true, true); err != nil {
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return err
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}
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cmd.Dir = dir
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if _, err := osutil.Run(10*time.Minute, cmd); err != nil {
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return err
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}
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// We build only bzImage as we currently don't use modules.
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cpu := strconv.Itoa(runtime.NumCPU())
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cmd = osutil.Command("make", "bzImage", "-j", cpu, "CC="+compiler)
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if err := osutil.Sandbox(cmd, true, true); err != nil {
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return err
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}
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cmd.Dir = dir
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// Build of a large kernel can take a while on a 1 CPU VM.
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if _, err := osutil.Run(3*time.Hour, cmd); err != nil {
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return err
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}
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return nil
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}
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// CreateImage creates a disk image that is suitable for syzkaller.
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// Kernel is taken from kernelDir, userspace system is taken from userspaceDir.
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// If cmdlineFile is not empty, contents of the file are appended to the kernel command line.
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// If sysctlFile is not empty, contents of the file are appended to the image /etc/sysctl.conf.
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// Produces image and root ssh key in the specified files.
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func CreateImage(kernelDir, userspaceDir, cmdlineFile, sysctlFile, image, sshkey string) error {
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tempDir, err := ioutil.TempDir("", "syz-build")
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if err != nil {
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return err
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}
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defer os.RemoveAll(tempDir)
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scriptFile := filepath.Join(tempDir, "create.sh")
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if err := osutil.WriteExecFile(scriptFile, []byte(createImageScript)); err != nil {
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return fmt.Errorf("failed to write script file: %v", err)
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}
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bzImage := filepath.Join(kernelDir, filepath.FromSlash("arch/x86/boot/bzImage"))
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cmd := osutil.Command(scriptFile, userspaceDir, bzImage)
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cmd.Dir = tempDir
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cmd.Env = append([]string{}, os.Environ()...)
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cmd.Env = append(cmd.Env,
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"SYZ_CMDLINE_FILE="+osutil.Abs(cmdlineFile),
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"SYZ_SYSCTL_FILE="+osutil.Abs(sysctlFile),
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)
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if _, err = osutil.Run(time.Hour, cmd); err != nil {
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return fmt.Errorf("image build failed: %v", err)
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}
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if err := osutil.CopyFile(filepath.Join(tempDir, "disk.raw"), image); err != nil {
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return err
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}
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if err := osutil.CopyFile(filepath.Join(tempDir, "key"), sshkey); err != nil {
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return err
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}
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if err := os.Chmod(sshkey, 0600); err != nil {
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return err
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}
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return nil
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}
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func CompilerIdentity(compiler string) (string, error) {
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output, err := osutil.RunCmd(time.Minute, "", compiler, "--version")
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if err != nil {
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return "", err
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}
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if len(output) == 0 {
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return "", fmt.Errorf("no output from compiler --version")
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}
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return strings.Split(string(output), "\n")[0], nil
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}
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