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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 build
import (
"fmt"
"os"
"path/filepath"
"strings"
"time"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/sys/targets"
starnixVM "github.com/google/syzkaller/vm/starnix"
)
type starnix struct{}
// The location of the default ffx build config (a Fuchsia implementation detail),
// relative to the kernel build dir. Contains default relative paths of build
// artifacts.
const ffxBuildConfig = "ffx-config.json"
// The name of the Fuchsia assembly override defined in `overrideRule`.
const overrideName = "syzkaller_starnix"
// A Fuchsia assembly override definition adding a package containing fuzzing dependencies.
var overrideRule = fmt.Sprintf(`import("//build/assembly/developer_overrides.gni")
assembly_developer_overrides("%s") {
testonly = true
base_packages = [
"//src/testing/fuzzing/syzkaller/starnix:syzkaller_starnix",
]
}
`, overrideName)
func (st starnix) build(params Params) (ImageDetails, error) {
sysTarget := targets.Get(targets.Linux, params.TargetArch)
arch := sysTarget.KernelArch
if arch != "x86_64" {
return ImageDetails{}, fmt.Errorf("unsupported starnix arch %v", arch)
}
arch = "x64"
product := fmt.Sprintf("%s.%s", "workbench_eng", arch)
localDir := filepath.Join(params.KernelDir, "local")
if err := os.MkdirAll(filepath.Join(params.KernelDir, "local"), 0755); err != nil {
return ImageDetails{}, err
}
overridePath := filepath.Join(localDir, "BUILD.gn")
if err := os.WriteFile(overridePath, []byte(overrideRule), 0660); err != nil {
return ImageDetails{}, err
}
if err := osutil.SandboxChown(overridePath); err != nil {
return ImageDetails{}, err
}
if err := osutil.SandboxChown(localDir); err != nil {
return ImageDetails{}, err
}
if _, err := runSandboxed(
30*time.Second,
params.KernelDir,
"scripts/fx", "build-profile", "disable",
); err != nil {
return ImageDetails{}, err
}
buildSubdir := "out/" + arch
if _, err := runSandboxed(
time.Hour,
params.KernelDir,
"scripts/fx", "--dir", buildSubdir,
"set", product,
"--debug",
"--assembly-override", fmt.Sprintf("//products/workbench/*=//local:%s", overrideName),
); err != nil {
return ImageDetails{}, err
}
if _, err := runSandboxed(time.Hour*2, params.KernelDir, "scripts/fx", "build"); err != nil {
return ImageDetails{}, err
}
ffxBinary, err := starnixVM.GetToolPath(params.KernelDir, "ffx")
if err != nil {
return ImageDetails{}, err
}
productBundlePathRaw, err := runSandboxed(
30*time.Second,
params.KernelDir,
ffxBinary,
"--no-environment",
"-c", filepath.Join(params.KernelDir, buildSubdir, ffxBuildConfig),
"-c", "log.enabled=false,ffx.analytics.disabled=true,daemon.autostart=false",
"config", "get", "product.path",
)
if err != nil {
return ImageDetails{}, err
}
productBundlePath := strings.Trim(string(productBundlePathRaw), "\"\n")
fxfsPathRaw, err := runSandboxed(
30*time.Second,
params.KernelDir,
ffxBinary,
"--no-environment",
"-c", "log.enabled=false,ffx.analytics.disabled=true,daemon.autostart=false",
"product", "get-image-path", productBundlePath,
"--slot", "a",
"--image-type", "fxfs.fastboot",
)
if err != nil {
return ImageDetails{}, err
}
fxfsPath := strings.Trim(string(fxfsPathRaw), "\"\n")
if err := osutil.CopyFile(fxfsPath, filepath.Join(params.OutputDir, "image")); err != nil {
return ImageDetails{}, err
}
kernelObjPath := filepath.Join(params.KernelDir, "out", arch, "exe.unstripped", "starnix_kernel")
if err := osutil.CopyFile(kernelObjPath, filepath.Join(params.OutputDir, "obj", "vmlinux")); err != nil {
return ImageDetails{}, err
}
return ImageDetails{}, nil
}
func (st starnix) clean(params Params) error {
_, err := runSandboxed(
time.Hour,
params.KernelDir,
"scripts/fx", "--dir", "out/"+params.TargetArch,
"clean",
)
return err
}
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