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e6d1a816d8
Running bisection using an older repro failed with:
<stdin>: In function ‘syz_mount_image.constprop’:
<stdin>:298:3: error: argument 1 null where non-null expected [-Werror=nonnull]
In file included from <stdin>:26:0:
/usr/include/x86_64-linux-gnu/sys/stat.h:320:12: note: in a call to function ‘mkdir’ declared here
extern int mkdir (const char *__path, __mode_t __mode)
Let's be safe and ignore warnings during repro/bisect.
Everything that runs during tests still has all warnings.
Update #501
115 lines
3.5 KiB
Go
115 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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package csource
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"runtime"
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"github.com/google/syzkaller/pkg/osutil"
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"github.com/google/syzkaller/prog"
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"github.com/google/syzkaller/sys/targets"
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)
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// Build builds a C program from source src and returns name of the resulting binary.
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func Build(target *prog.Target, src []byte) (string, error) {
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return build(target, src, "", true)
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}
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// BuildNoWarn is the same as Build, but ignores all compilation warnings.
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// Should not be used in tests, but may be used e.g. when we are bisecting and potentially
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// using an old repro with newer compiler, or a compiler that we never seen before.
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// In these cases it's more important to build successfully.
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func BuildNoWarn(target *prog.Target, src []byte) (string, error) {
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return build(target, src, "", false)
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}
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// BuildFile builds a C/C++ program from file src and returns name of the resulting binary.
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func BuildFile(target *prog.Target, src string) (string, error) {
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return build(target, nil, src, true)
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}
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func build(target *prog.Target, src []byte, file string, warn bool) (string, error) {
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sysTarget := targets.Get(target.OS, target.Arch)
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compiler := sysTarget.CCompiler
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if _, err := exec.LookPath(compiler); err != nil {
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return "", fmt.Errorf("no target compiler %v", compiler)
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}
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// We call the binary syz-executor because it sometimes shows in bug titles,
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// and we don't want 2 different bugs for when a crash is triggered during fuzzing and during repro.
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bin, err := osutil.TempFile("syz-executor")
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if err != nil {
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return "", err
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}
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flags := []string{
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"-o", bin,
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"-DGOOS_" + target.OS + "=1",
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"-DGOARCH_" + target.Arch + "=1",
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"-DHOSTGOOS_" + runtime.GOOS + "=1",
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}
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if file == "" {
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flags = append(flags, "-x", "c", "-")
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} else {
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flags = append(flags, file)
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}
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flags = append(flags, sysTarget.CrossCFlags...)
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if sysTarget.PtrSize == 4 {
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// We do generate uint64's for syscall arguments that overflow longs on 32-bit archs.
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flags = append(flags, "-Wno-overflow")
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}
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if !warn {
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flags = append(flags, "-fpermissive", "-w")
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}
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cmd := osutil.Command(compiler, flags...)
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if file == "" {
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cmd.Stdin = bytes.NewReader(src)
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}
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out, err := cmd.CombinedOutput()
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if err != nil {
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os.Remove(bin)
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if file != "" {
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src, _ = ioutil.ReadFile(file)
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}
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return "", fmt.Errorf("failed to build program:\n%s\n%s\ncompiler invocation: %v %v",
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src, out, compiler, flags)
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}
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return bin, nil
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}
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// Format reformats C source using clang-format.
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func Format(src []byte) ([]byte, error) {
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stdout, stderr := new(bytes.Buffer), new(bytes.Buffer)
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cmd := osutil.Command("clang-format", "-assume-filename=/src.c", "-style", style)
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cmd.Stdin = bytes.NewReader(src)
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cmd.Stdout = stdout
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cmd.Stderr = stderr
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if err := cmd.Run(); err != nil {
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return src, fmt.Errorf("failed to format source: %v\n%v", err, stderr.String())
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}
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return stdout.Bytes(), nil
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}
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// Something acceptable for kernel developers and email-friendly.
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var style = `{
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BasedOnStyle: LLVM,
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IndentWidth: 2,
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UseTab: Never,
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BreakBeforeBraces: Linux,
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IndentCaseLabels: false,
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DerivePointerAlignment: false,
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PointerAlignment: Left,
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AlignTrailingComments: true,
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AllowShortBlocksOnASingleLine: false,
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AllowShortCaseLabelsOnASingleLine: false,
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AllowShortFunctionsOnASingleLine: false,
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AllowShortIfStatementsOnASingleLine: false,
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AllowShortLoopsOnASingleLine: false,
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ColumnLimit: 80,
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}`
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