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// Copyright 2017 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.
//go:generate go run gen.go
package csource
import (
"bytes"
"fmt"
"strings"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/prog"
"github.com/google/syzkaller/sys/targets"
)
const (
linux = "linux"
akaros = "akaros"
fuchsia = "fuchsia"
sandboxNone = "none"
sandboxSetuid = "setuid"
sandboxNamespace = "namespace"
)
func createCommonHeader(p, mmapProg *prog.Prog, replacements map[string]string, opts Options) ([]byte, error) {
defines, err := defineList(p, mmapProg, opts)
if err != nil {
return nil, err
}
cmd := osutil.Command("cpp", "-nostdinc", "-undef", "-fdirectives-only", "-dDI", "-E", "-P", "-")
for _, def := range defines {
cmd.Args = append(cmd.Args, "-D"+def)
}
cmd.Stdin = strings.NewReader(commonHeader)
stderr := new(bytes.Buffer)
stdout := new(bytes.Buffer)
cmd.Stderr = stderr
cmd.Stdout = stdout
if err := cmd.Run(); len(stdout.Bytes()) == 0 {
return nil, fmt.Errorf("cpp failed: %v\n%v\n%v", err, stdout.String(), stderr.String())
}
src, err := removeSystemDefines(stdout.Bytes(), defines)
if err != nil {
return nil, err
}
for from, to := range replacements {
src = bytes.Replace(src, []byte("[["+from+"]]"), []byte(to), -1)
}
for from, to := range map[string]string{
"uint64": "uint64_t",
"uint32": "uint32_t",
"uint16": "uint16_t",
"uint8": "uint8_t",
} {
src = bytes.Replace(src, []byte(from), []byte(to), -1)
}
return src, nil
}
func defineList(p, mmapProg *prog.Prog, opts Options) ([]string, error) {
var defines []string
bitmasks, csums := prog.RequiredFeatures(p)
if bitmasks {
defines = append(defines, "SYZ_USE_BITMASKS")
}
if csums {
defines = append(defines, "SYZ_USE_CHECKSUMS")
}
switch opts.Sandbox {
case "":
// No sandbox, do nothing.
case sandboxNone:
defines = append(defines, "SYZ_SANDBOX_NONE")
case sandboxSetuid:
defines = append(defines, "SYZ_SANDBOX_SETUID")
case sandboxNamespace:
defines = append(defines, "SYZ_SANDBOX_NAMESPACE")
default:
return nil, fmt.Errorf("unknown sandbox mode: %v", opts.Sandbox)
}
if opts.Threaded {
defines = append(defines, "SYZ_THREADED")
}
if opts.Collide {
defines = append(defines, "SYZ_COLLIDE")
}
if opts.Repeat {
defines = append(defines, "SYZ_REPEAT")
}
if opts.RepeatTimes > 1 {
defines = append(defines, "SYZ_REPEAT_TIMES")
}
if opts.Procs > 1 {
defines = append(defines, "SYZ_PROCS")
}
if opts.Fault {
defines = append(defines, "SYZ_FAULT_INJECTION")
}
if opts.EnableTun {
defines = append(defines, "SYZ_TUN_ENABLE")
}
if opts.EnableCgroups {
defines = append(defines, "SYZ_ENABLE_CGROUPS")
}
if opts.EnableNetdev {
defines = append(defines, "SYZ_ENABLE_NETDEV")
}
if opts.ResetNet {
defines = append(defines, "SYZ_RESET_NET_NAMESPACE")
}
if opts.UseTmpDir {
defines = append(defines, "SYZ_USE_TMP_DIR")
}
if opts.HandleSegv {
defines = append(defines, "SYZ_HANDLE_SEGV")
}
if opts.Repro {
defines = append(defines, "SYZ_REPRO")
}
if opts.Trace {
defines = append(defines, "SYZ_TRACE")
}
for _, c := range p.Calls {
defines = append(defines, "__NR_"+c.Meta.CallName)
}
for _, c := range mmapProg.Calls {
defines = append(defines, "__NR_"+c.Meta.CallName)
}
defines = append(defines, "GOOS_"+p.Target.OS)
defines = append(defines, "GOARCH_"+p.Target.Arch)
sysTarget := targets.Get(p.Target.OS, p.Target.Arch)
if sysTarget.ExecutorUsesShmem {
defines = append(defines, "SYZ_EXECUTOR_USES_SHMEM")
}
if sysTarget.ExecutorUsesForkServer {
defines = append(defines, "SYZ_EXECUTOR_USES_FORK_SERVER")
}
return defines, nil
}
func removeSystemDefines(src []byte, defines []string) ([]byte, error) {
remove := map[string]string{
"__STDC__": "1",
"__STDC_HOSTED__": "1",
"__STDC_UTF_16__": "1",
"__STDC_UTF_32__": "1",
}
for _, def := range defines {
eq := strings.IndexByte(def, '=')
if eq == -1 {
remove[def] = "1"
} else {
remove[def[:eq]] = def[eq+1:]
}
}
for def, val := range remove {
src = bytes.Replace(src, []byte("#define "+def+" "+val+"\n"), nil, -1)
}
// strip: #define __STDC_VERSION__ 201112L
for _, def := range []string{"__STDC_VERSION__"} {
pos := bytes.Index(src, []byte("#define "+def))
if pos == -1 {
continue
}
end := bytes.IndexByte(src[pos:], '\n')
if end == -1 {
continue
}
src = bytes.Replace(src, src[pos:end+1], nil, -1)
}
return src, nil
}
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