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// Copyright 2015 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build freebsd || linux package syscall_test import ( "bufio" "fmt" "internal/testenv" "io" "os" "os/exec" "os/signal" "os/user" "path/filepath" "strconv" "strings" "syscall" "testing" ) // TestDeathSignalSetuid verifies that a command run with a different UID still // receives PDeathsig; it is a regression test for https://go.dev/issue/9686. func TestDeathSignalSetuid(t *testing.T) { if testing.Short() { t.Skipf("skipping test that copies its binary into temp dir") } // Copy the test binary to a location that another user can read/execute // after we drop privileges. // // TODO(bcmills): Why do we believe that another users will be able to // execute a binary in this directory? (It could be mounted noexec.) tempDir, err := os.MkdirTemp("", "TestDeathSignal") if err != nil { t.Fatalf("cannot create temporary directory: %v", err) } defer os.RemoveAll(tempDir) os.Chmod(tempDir, 0755) tmpBinary := filepath.Join(tempDir, filepath.Base(os.Args[0])) src, err := os.Open(os.Args[0]) if err != nil { t.Fatalf("cannot open binary %q, %v", os.Args[0], err) } defer src.Close() dst, err := os.OpenFile(tmpBinary, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755) if err != nil { t.Fatalf("cannot create temporary binary %q, %v", tmpBinary, err) } if _, err := io.Copy(dst, src); err != nil { t.Fatalf("failed to copy test binary to %q, %v", tmpBinary, err) } err = dst.Close() if err != nil { t.Fatalf("failed to close test binary %q, %v", tmpBinary, err) } cmd := testenv.Command(t, tmpBinary) cmd.Env = append(cmd.Environ(), "GO_DEATHSIG_PARENT=1") chldStdin, err := cmd.StdinPipe() if err != nil { t.Fatalf("failed to create new stdin pipe: %v", err) } chldStdout, err := cmd.StdoutPipe() if err != nil { t.Fatalf("failed to create new stdout pipe: %v", err) } stderr := new(strings.Builder) cmd.Stderr = stderr err = cmd.Start() defer func() { chldStdin.Close() cmd.Wait() if stderr.Len() > 0 { t.Logf("stderr:\n%s", stderr) } }() if err != nil { t.Fatalf("failed to start first child process: %v", err) } chldPipe := bufio.NewReader(chldStdout) if got, err := chldPipe.ReadString('\n'); got == "start\n" { syscall.Kill(cmd.Process.Pid, syscall.SIGTERM) want := "ok\n" if got, err = chldPipe.ReadString('\n'); got != want { t.Fatalf("expected %q, received %q, %v", want, got, err) } } else if got == "skip\n" { t.Skipf("skipping: parent could not run child program as selected user") } else { t.Fatalf("did not receive start from child, received %q, %v", got, err) } } func deathSignalParent() { var ( u *user.User err error ) if os.Getuid() == 0 { tryUsers := []string{"nobody"} if testenv.Builder() != "" { tryUsers = append(tryUsers, "gopher") } for _, name := range tryUsers { u, err = user.Lookup(name) if err == nil { break } fmt.Fprintf(os.Stderr, "Lookup(%q): %v\n", name, err) } } if u == nil { // If we couldn't find an unprivileged user to run as, try running as // the current user. (Empirically this still causes the call to Start to // fail with a permission error if running as a non-root user on Linux.) u, err = user.Current() if err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(1) } } uid, err := strconv.ParseUint(u.Uid, 10, 32) if err != nil { fmt.Fprintf(os.Stderr, "invalid UID: %v\n", err) os.Exit(1) } gid, err := strconv.ParseUint(u.Gid, 10, 32) if err != nil { fmt.Fprintf(os.Stderr, "invalid GID: %v\n", err) os.Exit(1) } cmd := exec.Command(os.Args[0]) cmd.Env = append(os.Environ(), "GO_DEATHSIG_PARENT=", "GO_DEATHSIG_CHILD=1", ) cmd.Stdin = os.Stdin cmd.Stdout = os.Stdout attrs := syscall.SysProcAttr{ Pdeathsig: syscall.SIGUSR1, Credential: &syscall.Credential{Uid: uint32(uid), Gid: uint32(gid)}, } cmd.SysProcAttr = &attrs fmt.Fprintf(os.Stderr, "starting process as user %q\n", u.Username) if err := cmd.Start(); err != nil { fmt.Fprintln(os.Stderr, err) if testenv.SyscallIsNotSupported(err) { fmt.Println("skip") os.Exit(0) } os.Exit(1) } cmd.Wait() os.Exit(0) } func deathSignalChild() { c := make(chan os.Signal, 1) signal.Notify(c, syscall.SIGUSR1) go func() { <-c fmt.Println("ok") os.Exit(0) }() fmt.Println("start") buf := make([]byte, 32) os.Stdin.Read(buf) // We expected to be signaled before stdin closed fmt.Println("not ok") os.Exit(1) }