mirror of
https://github.com/reactos/syzkaller.git
synced 2024-11-24 11:59:58 +00:00
102 lines
3.0 KiB
Go
102 lines
3.0 KiB
Go
// 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.
|
|
|
|
package csource
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"os/exec"
|
|
|
|
"github.com/google/syzkaller/pkg/osutil"
|
|
"github.com/google/syzkaller/prog"
|
|
"github.com/google/syzkaller/sys/targets"
|
|
)
|
|
|
|
// Build builds a C program from source src and returns name of the resulting binary.
|
|
func Build(target *prog.Target, src []byte) (string, error) {
|
|
return build(target, src, "")
|
|
}
|
|
|
|
// BuildFile builds a C/C++ program from file src and returns name of the resulting binary.
|
|
func BuildFile(target *prog.Target, src string) (string, error) {
|
|
return build(target, nil, src)
|
|
}
|
|
|
|
func build(target *prog.Target, src []byte, file string) (string, error) {
|
|
sysTarget := targets.Get(target.OS, target.Arch)
|
|
compiler := sysTarget.CCompiler
|
|
if _, err := exec.LookPath(compiler); err != nil {
|
|
return "", fmt.Errorf("no target compiler %v", compiler)
|
|
}
|
|
// We call the binary syz-executor because it sometimes shows in bug titles,
|
|
// and we don't want 2 different bugs for when a crash is triggered during fuzzing and during repro.
|
|
bin, err := osutil.TempFile("syz-executor")
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
flags := []string{
|
|
"-Wall", "-Werror", "-O1", "-g", "-o", bin, "-pthread",
|
|
"-DGOOS_" + target.OS + "=1",
|
|
"-DGOARCH_" + target.Arch + "=1",
|
|
}
|
|
if file == "" {
|
|
flags = append(flags, "-x", "c", "-")
|
|
} else {
|
|
flags = append(flags, file)
|
|
}
|
|
flags = append(flags, sysTarget.CrossCFlags...)
|
|
if sysTarget.PtrSize == 4 {
|
|
// We do generate uint64's for syscall arguments that overflow longs on 32-bit archs.
|
|
flags = append(flags, "-Wno-overflow")
|
|
}
|
|
cmd := osutil.Command(compiler, flags...)
|
|
if file == "" {
|
|
cmd.Stdin = bytes.NewReader(src)
|
|
}
|
|
out, err := cmd.CombinedOutput()
|
|
if err != nil {
|
|
os.Remove(bin)
|
|
if file != "" {
|
|
src, _ = ioutil.ReadFile(file)
|
|
}
|
|
return "", fmt.Errorf("failed to build program:\n%s\n%s\ncompiler invocation: %v %v",
|
|
src, out, compiler, flags)
|
|
}
|
|
return bin, nil
|
|
}
|
|
|
|
// Format reformats C source using clang-format.
|
|
func Format(src []byte) ([]byte, error) {
|
|
stdout, stderr := new(bytes.Buffer), new(bytes.Buffer)
|
|
cmd := osutil.Command("clang-format", "-assume-filename=/src.c", "-style", style)
|
|
cmd.Stdin = bytes.NewReader(src)
|
|
cmd.Stdout = stdout
|
|
cmd.Stderr = stderr
|
|
if err := cmd.Run(); err != nil {
|
|
return src, fmt.Errorf("failed to format source: %v\n%v", err, stderr.String())
|
|
}
|
|
return stdout.Bytes(), nil
|
|
}
|
|
|
|
// Something acceptable for kernel developers and email-friendly.
|
|
var style = `{
|
|
BasedOnStyle: LLVM,
|
|
IndentWidth: 2,
|
|
UseTab: Never,
|
|
BreakBeforeBraces: Linux,
|
|
IndentCaseLabels: false,
|
|
DerivePointerAlignment: false,
|
|
PointerAlignment: Left,
|
|
AlignTrailingComments: true,
|
|
AllowShortBlocksOnASingleLine: false,
|
|
AllowShortCaseLabelsOnASingleLine: false,
|
|
AllowShortFunctionsOnASingleLine: false,
|
|
AllowShortIfStatementsOnASingleLine: false,
|
|
AllowShortLoopsOnASingleLine: false,
|
|
ColumnLimit: 80,
|
|
}`
|