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// Copyright 2009 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 unix // Fork, exec, wait, etc. package syscall import ( errorspkg "errors" "internal/bytealg" "runtime" "sync" "unsafe" ) // ForkLock is used to synchronize creation of new file descriptors // with fork. // // We want the child in a fork/exec sequence to inherit only the // file descriptors we intend. To do that, we mark all file // descriptors close-on-exec and then, in the child, explicitly // unmark the ones we want the exec'ed program to keep. // Unix doesn't make this easy: there is, in general, no way to // allocate a new file descriptor close-on-exec. Instead you // have to allocate the descriptor and then mark it close-on-exec. // If a fork happens between those two events, the child's exec // will inherit an unwanted file descriptor. // // This lock solves that race: the create new fd/mark close-on-exec // operation is done holding ForkLock for reading, and the fork itself // is done holding ForkLock for writing. At least, that's the idea. // There are some complications. // // Some system calls that create new file descriptors can block // for arbitrarily long times: open on a hung NFS server or named // pipe, accept on a socket, and so on. We can't reasonably grab // the lock across those operations. // // It is worse to inherit some file descriptors than others. // If a non-malicious child accidentally inherits an open ordinary file, // that's not a big deal. On the other hand, if a long-lived child // accidentally inherits the write end of a pipe, then the reader // of that pipe will not see EOF until that child exits, potentially // causing the parent program to hang. This is a common problem // in threaded C programs that use popen. // // Luckily, the file descriptors that are most important not to // inherit are not the ones that can take an arbitrarily long time // to create: pipe returns instantly, and the net package uses // non-blocking I/O to accept on a listening socket. // The rules for which file descriptor-creating operations use the // ForkLock are as follows: // // - Pipe. Use pipe2 if available. Otherwise, does not block, // so use ForkLock. // - Socket. Use SOCK_CLOEXEC if available. Otherwise, does not // block, so use ForkLock. // - Open. Use O_CLOEXEC if available. Otherwise, may block, // so live with the race. // - Dup. Use F_DUPFD_CLOEXEC or dup3 if available. Otherwise, // does not block, so use ForkLock. var ForkLock sync.RWMutex // StringSlicePtr converts a slice of strings to a slice of pointers // to NUL-terminated byte arrays. If any string contains a NUL byte // this function panics instead of returning an error. // // Deprecated: Use SlicePtrFromStrings instead. func StringSlicePtr(ss []string) []*byte { bb := make([]*byte, len(ss)+1) for i := 0; i < len(ss); i++ { bb[i] = StringBytePtr(ss[i]) } bb[len(ss)] = nil return bb } // SlicePtrFromStrings converts a slice of strings to a slice of // pointers to NUL-terminated byte arrays. If any string contains // a NUL byte, it returns (nil, EINVAL). func SlicePtrFromStrings(ss []string) ([]*byte, error) { n := 0 for _, s := range ss { if bytealg.IndexByteString(s, 0) != -1 { return nil, EINVAL } n += len(s) + 1 // +1 for NUL } bb := make([]*byte, len(ss)+1) b := make([]byte, n) n = 0 for i, s := range ss { bb[i] = &b[n] copy(b[n:], s) n += len(s) + 1 } return bb, nil } func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) } func SetNonblock(fd int, nonblocking bool) (err error) { flag, err := fcntl(fd, F_GETFL, 0) if err != nil { return err } if (flag&O_NONBLOCK != 0) == nonblocking { return nil } if nonblocking { flag |= O_NONBLOCK } else { flag &^= O_NONBLOCK } _, err = fcntl(fd, F_SETFL, flag) return err } // Credential holds user and group identities to be assumed // by a child process started by StartProcess. type Credential struct { Uid uint32 // User ID. Gid uint32 // Group ID. Groups []uint32 // Supplementary group IDs. NoSetGroups bool // If true, don't set supplementary groups } // ProcAttr holds attributes that will be applied to a new process started // by StartProcess. type ProcAttr struct { Dir string // Current working directory. Env []string // Environment. Files []uintptr // File descriptors. Sys *SysProcAttr } var zeroProcAttr ProcAttr var zeroSysProcAttr SysProcAttr func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) { var p [2]int var n int var err1 Errno var wstatus WaitStatus if attr == nil { attr = &zeroProcAttr } sys := attr.Sys if sys == nil { sys = &zeroSysProcAttr } // Convert args to C form. argv0p, err := BytePtrFromString(argv0) if err != nil { return 0, err } argvp, err := SlicePtrFromStrings(argv) if err != nil { return 0, err } envvp, err := SlicePtrFromStrings(attr.Env) if err != nil { return 0, err } if (runtime.GOOS == "freebsd" || runtime.GOOS == "dragonfly") && len(argv) > 0 && len(argv[0]) > len(argv0) { argvp[0] = argv0p } var chroot *byte if sys.Chroot != "" { chroot, err = BytePtrFromString(sys.Chroot) if err != nil { return 0, err } } var dir *byte if attr.Dir != "" { dir, err = BytePtrFromString(attr.Dir) if err != nil { return 0, err } } // Both Setctty and Foreground use the Ctty field, // but they give it slightly different meanings. if sys.Setctty && sys.Foreground { return 0, errorspkg.New("both Setctty and Foreground set in SysProcAttr") } if sys.Setctty && sys.Ctty >= len(attr.Files) { return 0, errorspkg.New("Setctty set but Ctty not valid in child") } acquireForkLock() // Allocate child status pipe close on exec. if err = forkExecPipe(p[:]); err != nil { releaseForkLock() return 0, err } // Kick off child. pid, err1 = forkAndExecInChild(argv0p, argvp, envvp, chroot, dir, attr, sys, p[1]) if err1 != 0 { Close(p[0]) Close(p[1]) releaseForkLock() return 0, Errno(err1) } releaseForkLock() // Read child error status from pipe. Close(p[1]) for { n, err = readlen(p[0], (*byte)(unsafe.Pointer(&err1)), int(unsafe.Sizeof(err1))) if err != EINTR { break } } Close(p[0]) if err != nil || n != 0 { if n == int(unsafe.Sizeof(err1)) { err = Errno(err1) } if err == nil { err = EPIPE } // Child failed; wait for it to exit, to make sure // the zombies don't accumulate. _, err1 := Wait4(pid, &wstatus, 0, nil) for err1 == EINTR { _, err1 = Wait4(pid, &wstatus, 0, nil) } return 0, err } // Read got EOF, so pipe closed on exec, so exec succeeded. return pid, nil } // Combination of fork and exec, careful to be thread safe. func ForkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err error) { return forkExec(argv0, argv, attr) } // StartProcess wraps ForkExec for package os. func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) { pid, err = forkExec(argv0, argv, attr) return pid, 0, err } // Implemented in runtime package. func runtime_BeforeExec() func runtime_AfterExec() // execveLibc is non-nil on OS using libc syscall, set to execve in exec_libc.go; this // avoids a build dependency for other platforms. var execveLibc func(path uintptr, argv uintptr, envp uintptr) Errno var execveDarwin func(path *byte, argv **byte, envp **byte) error var execveOpenBSD func(path *byte, argv **byte, envp **byte) error // Exec invokes the execve(2) system call. func Exec(argv0 string, argv []string, envv []string) (err error) { argv0p, err := BytePtrFromString(argv0) if err != nil { return err } argvp, err := SlicePtrFromStrings(argv) if err != nil { return err } envvp, err := SlicePtrFromStrings(envv) if err != nil { return err } runtime_BeforeExec() rlim := origRlimitNofile.Load() if rlim != nil { Setrlimit(RLIMIT_NOFILE, rlim) } var err1 error if runtime.GOOS == "solaris" || runtime.GOOS == "illumos" || runtime.GOOS == "aix" { // RawSyscall should never be used on Solaris, illumos, or AIX. err1 = execveLibc( uintptr(unsafe.Pointer(argv0p)), uintptr(unsafe.Pointer(&argvp[0])), uintptr(unsafe.Pointer(&envvp[0]))) } else if runtime.GOOS == "darwin" || runtime.GOOS == "ios" { // Similarly on Darwin. err1 = execveDarwin(argv0p, &argvp[0], &envvp[0]) } else if runtime.GOOS == "openbsd" && runtime.GOARCH != "mips64" { // Similarly on OpenBSD. err1 = execveOpenBSD(argv0p, &argvp[0], &envvp[0]) } else { _, _, err1 = RawSyscall(SYS_EXECVE, uintptr(unsafe.Pointer(argv0p)), uintptr(unsafe.Pointer(&argvp[0])), uintptr(unsafe.Pointer(&envvp[0]))) } runtime_AfterExec() return err1 }