예제 #1
0
파일: fileops.c 프로젝트: Kampi/Zybo-Linux
_IO_FILE *
_IO_file_open (_IO_FILE *fp, const char *filename, int posix_mode, int prot,
	       int read_write, int is32not64)
{
  int fdesc;
#ifdef _LIBC
  if (__glibc_unlikely (fp->_flags2 & _IO_FLAGS2_NOTCANCEL))
    fdesc = open_not_cancel (filename,
			     posix_mode | (is32not64 ? 0 : O_LARGEFILE), prot);
  else
    fdesc = open (filename, posix_mode | (is32not64 ? 0 : O_LARGEFILE), prot);
#else
  fdesc = open (filename, posix_mode, prot);
#endif
  if (fdesc < 0)
    return NULL;
  fp->_fileno = fdesc;
  _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
  /* For append mode, send the file offset to the end of the file.  Don't
     update the offset cache though, since the file handle is not active.  */
  if ((read_write & (_IO_IS_APPENDING | _IO_NO_READS))
      == (_IO_IS_APPENDING | _IO_NO_READS))
    {
      _IO_off64_t new_pos = _IO_SYSSEEK (fp, 0, _IO_seek_end);
      if (new_pos == _IO_pos_BAD && errno != ESPIPE)
	{
	  close_not_cancel (fdesc);
	  return NULL;
	}
    }
  _IO_link_in ((struct _IO_FILE_plus *) fp);
  return fp;
}
예제 #2
0
/* Should other OSes (e.g., Hurd) have different versions which can
   be written in a better way?  */
static void
check_one_fd (int fd, int mode)
{
  /* Note that fcntl() with this parameter is not a cancellation point.  */
  if (__builtin_expect (__libc_fcntl (fd, F_GETFD), 0) == -1
      && errno == EBADF)
    {
      const char *name;
      dev_t dev;

      /* For writable descriptors we use /dev/full.  */
      if ((mode & O_ACCMODE) == O_WRONLY)
	{
	  name = _PATH_DEV "full";
	  dev = makedev (DEV_FULL_MAJOR, DEV_FULL_MINOR);
	}
      else
	{
	  name = _PATH_DEVNULL;
	  dev = makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR);
	}

      /* Something is wrong with this descriptor, it's probably not
	 opened.  Open /dev/null so that the SUID program we are
	 about to start does not accidently use this descriptor.  */
      int nullfd = open_not_cancel (name, mode, 0);

      /* We are very paranoid here.  With all means we try to ensure
	 that we are actually opening the /dev/null device and nothing
	 else.

	 Note that the following code assumes that STDIN_FILENO,
	 STDOUT_FILENO, STDERR_FILENO are the three lowest file
	 decsriptor numbers, in this order.  */
      struct stat64 st;
      if (__builtin_expect (nullfd != fd, 0)
	  || __builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) != 0
	  || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
	  || st.st_rdev != dev)
	/* We cannot even give an error message here since it would
	   run into the same problems.  */
	while (1)
	  /* Try for ever and ever.  */
	  ABORT_INSTRUCTION;
    }
}
예제 #3
0
int daemon(int nochdir, int noclose)
{
	int fd;

	if (fork_parent() == -1)
		return -1;

	if (setsid() == -1)
		return -1;

	if (!nochdir)
		chdir("/");

	if (!noclose)
	{
		struct STAT st;

		if ((fd = open_not_cancel(_PATH_DEVNULL, O_RDWR, 0)) != -1
			&& (__builtin_expect (FSTAT (fd, &st), 0) == 0))
		{
			if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0) {
				dup2(fd, STDIN_FILENO);
				dup2(fd, STDOUT_FILENO);
				dup2(fd, STDERR_FILENO);
				if (fd > 2)
					close(fd);
			} else {
				/* We must set an errno value since no
				   function call actually failed.  */
				close_not_cancel_no_status (fd);
				__set_errno (ENODEV);
				return -1;
			}
		} else {
			close_not_cancel_no_status (fd);
			return -1;
		}
	}
	return 0;
}
예제 #4
0
/* Spawn a new process executing PATH with the attributes describes in *ATTRP.
   Before running the process perform the actions described in FILE-ACTIONS. */
int
__spawni (pid_t *pid, const char *file,
	  const posix_spawn_file_actions_t *file_actions,
	  const posix_spawnattr_t *attrp, char *const argv[],
	  char *const envp[], int xflags)
{
  pid_t new_pid;
  char *path, *p, *name;
  size_t len;
  size_t pathlen;

  /* Do this once.  */
  short int flags = attrp == NULL ? 0 : attrp->__flags;

  /* Generate the new process.  */
  if ((flags & POSIX_SPAWN_USEVFORK) != 0
      /* If no major work is done, allow using vfork.  Note that we
	 might perform the path searching.  But this would be done by
	 a call to execvp(), too, and such a call must be OK according
	 to POSIX.  */
      || ((flags & (POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSIGDEF
		    | POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER
		    | POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_RESETIDS)) == 0
	  && file_actions == NULL))
    new_pid = __vfork ();
  else
    new_pid = __fork ();

  if (new_pid != 0)
    {
      if (new_pid < 0)
	return errno;

      /* The call was successful.  Store the PID if necessary.  */
      if (pid != NULL)
	*pid = new_pid;

      return 0;
    }

  /* Set signal mask.  */
  if ((flags & POSIX_SPAWN_SETSIGMASK) != 0
      && __sigprocmask (SIG_SETMASK, &attrp->__ss, NULL) != 0)
    _exit (SPAWN_ERROR);

  /* Set signal default action.  */
  if ((flags & POSIX_SPAWN_SETSIGDEF) != 0)
    {
      /* We have to iterate over all signals.  This could possibly be
	 done better but it requires system specific solutions since
	 the sigset_t data type can be very different on different
	 architectures.  */
      int sig;
      struct sigaction sa;

      memset (&sa, '\0', sizeof (sa));
      sa.sa_handler = SIG_DFL;

      for (sig = 1; sig <= _NSIG; ++sig)
	if (__sigismember (&attrp->__sd, sig) != 0
	    && __sigaction (sig, &sa, NULL) != 0)
	  _exit (SPAWN_ERROR);

    }

#ifdef _POSIX_PRIORITY_SCHEDULING
  /* Set the scheduling algorithm and parameters.  */
  if ((flags & (POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER))
      == POSIX_SPAWN_SETSCHEDPARAM)
    {
      if (__sched_setparam (0, &attrp->__sp) == -1)
	_exit (SPAWN_ERROR);
    }
  else if ((flags & POSIX_SPAWN_SETSCHEDULER) != 0)
    {
      if (__sched_setscheduler (0, attrp->__policy, &attrp->__sp) == -1)
	_exit (SPAWN_ERROR);
    }
#endif

  /* Set the process group ID.  */
  if ((flags & POSIX_SPAWN_SETPGROUP) != 0
      && __setpgid (0, attrp->__pgrp) != 0)
    _exit (SPAWN_ERROR);

  /* Set the effective user and group IDs.  */
  if ((flags & POSIX_SPAWN_RESETIDS) != 0
      && (local_seteuid (__getuid ()) != 0
	  || local_setegid (__getgid ()) != 0))
    _exit (SPAWN_ERROR);

  /* Execute the file actions.  */
  if (file_actions != NULL)
    {
      int cnt;
      struct rlimit64 fdlimit;
      bool have_fdlimit = false;

      for (cnt = 0; cnt < file_actions->__used; ++cnt)
	{
	  struct __spawn_action *action = &file_actions->__actions[cnt];

	  switch (action->tag)
	    {
	    case spawn_do_close:
	      if (close_not_cancel (action->action.close_action.fd) != 0)
		{
		  if (! have_fdlimit)
		    {
		      getrlimit64 (RLIMIT_NOFILE, &fdlimit);
		      have_fdlimit = true;
		    }

		  /* Only signal errors for file descriptors out of range.  */
		  if (action->action.close_action.fd < 0
		      || action->action.close_action.fd >= fdlimit.rlim_cur)
		    /* Signal the error.  */
		    _exit (SPAWN_ERROR);
		}
	      break;

	    case spawn_do_open:
	      {
		int new_fd = open_not_cancel (action->action.open_action.path,
					      action->action.open_action.oflag
					      | O_LARGEFILE,
					      action->action.open_action.mode);

		if (new_fd == -1)
		  /* The `open' call failed.  */
		  _exit (SPAWN_ERROR);

		/* Make sure the desired file descriptor is used.  */
		if (new_fd != action->action.open_action.fd)
		  {
		    if (__dup2 (new_fd, action->action.open_action.fd)
			!= action->action.open_action.fd)
		      /* The `dup2' call failed.  */
		      _exit (SPAWN_ERROR);

		    if (close_not_cancel (new_fd) != 0)
		      /* The `close' call failed.  */
		      _exit (SPAWN_ERROR);
		  }
	      }
	      break;

	    case spawn_do_dup2:
	      if (__dup2 (action->action.dup2_action.fd,
			  action->action.dup2_action.newfd)
		  != action->action.dup2_action.newfd)
		/* The `dup2' call failed.  */
		_exit (SPAWN_ERROR);
	      break;
	    }
	}
    }

  if ((xflags & SPAWN_XFLAGS_USE_PATH) == 0 || strchr (file, '/') != NULL)
    {
      /* The FILE parameter is actually a path.  */
      __execve (file, argv, envp);

      maybe_script_execute (file, argv, envp, xflags);

      /* Oh, oh.  `execve' returns.  This is bad.  */
      _exit (SPAWN_ERROR);
    }

  /* We have to search for FILE on the path.  */
  path = getenv ("PATH");
  if (path == NULL)
    {
      /* There is no `PATH' in the environment.
	 The default search path is the current directory
	 followed by the path `confstr' returns for `_CS_PATH'.  */
      len = confstr (_CS_PATH, (char *) NULL, 0);
      path = (char *) __alloca (1 + len);
      path[0] = ':';
      (void) confstr (_CS_PATH, path + 1, len);
    }

  len = strlen (file) + 1;
  pathlen = strlen (path);
  name = __alloca (pathlen + len + 1);
  /* Copy the file name at the top.  */
  name = (char *) memcpy (name + pathlen + 1, file, len);
  /* And add the slash.  */
  *--name = '/';

  p = path;
  do
    {
      char *startp;

      path = p;
      p = __strchrnul (path, ':');

      if (p == path)
	/* Two adjacent colons, or a colon at the beginning or the end
	   of `PATH' means to search the current directory.  */
	startp = name + 1;
      else
	startp = (char *) memcpy (name - (p - path), path, p - path);

      /* Try to execute this name.  If it works, execv will not return.  */
      __execve (startp, argv, envp);

      maybe_script_execute (startp, argv, envp, xflags);

      switch (errno)
	{
	case EACCES:
	case ENOENT:
	case ESTALE:
	case ENOTDIR:
	  /* Those errors indicate the file is missing or not executable
	     by us, in which case we want to just try the next path
	     directory.  */
	  break;

	default:
	  /* Some other error means we found an executable file, but
	     something went wrong executing it; return the error to our
	     caller.  */
	  _exit (SPAWN_ERROR);
	    }
    }
  while (*p++ != '\0');

  /* Return with an error.  */
  _exit (SPAWN_ERROR);
}
예제 #5
0
파일: spawni.c 프로젝트: doniexun/glibc
/* Function used in the clone call to setup the signals mask, posix_spawn
   attributes, and file actions.  It run on its own stack (provided by the
   posix_spawn call).  */
static int
__spawni_child (void *arguments)
{
  struct posix_spawn_args *args = arguments;
  const posix_spawnattr_t *restrict attr = args->attr;
  const posix_spawn_file_actions_t *file_actions = args->fa;
  int p = args->pipe[1];
  int ret;

  close_not_cancel (args->pipe[0]);

  /* The child must ensure that no signal handler are enabled because it shared
     memory with parent, so the signal disposition must be either SIG_DFL or
     SIG_IGN.  It does by iterating over all signals and although it could
     possibly be more optimized (by tracking which signal potentially have a
     signal handler), it might requires system specific solutions (since the
     sigset_t data type can be very different on different architectures).  */
  struct sigaction sa;
  memset (&sa, '\0', sizeof (sa));

  sigset_t hset;
  __sigprocmask (SIG_BLOCK, 0, &hset);
  for (int sig = 1; sig < _NSIG; ++sig)
    {
      if ((attr->__flags & POSIX_SPAWN_SETSIGDEF)
	  && sigismember (&attr->__sd, sig))
	{
	  sa.sa_handler = SIG_DFL;
	}
      else if (sigismember (&hset, sig))
	{
	  if (__nptl_is_internal_signal (sig))
	    sa.sa_handler = SIG_IGN;
	  else
	    {
	      __libc_sigaction (sig, 0, &sa);
	      if (sa.sa_handler == SIG_IGN)
		continue;
	      sa.sa_handler = SIG_DFL;
	    }
	}
      else
	continue;

      __libc_sigaction (sig, &sa, 0);
    }

#ifdef _POSIX_PRIORITY_SCHEDULING
  /* Set the scheduling algorithm and parameters.  */
  if ((attr->__flags & (POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER))
      == POSIX_SPAWN_SETSCHEDPARAM)
    {
      if ((ret = __sched_setparam (0, &attr->__sp)) == -1)
	goto fail;
    }
  else if ((attr->__flags & POSIX_SPAWN_SETSCHEDULER) != 0)
    {
      if ((ret = __sched_setscheduler (0, attr->__policy, &attr->__sp)) == -1)
	goto fail;
    }
#endif

  /* Set the process group ID.  */
  if ((attr->__flags & POSIX_SPAWN_SETPGROUP) != 0
      && (ret = __setpgid (0, attr->__pgrp)) != 0)
    goto fail;

  /* Set the effective user and group IDs.  */
  if ((attr->__flags & POSIX_SPAWN_RESETIDS) != 0
      && ((ret = local_seteuid (__getuid ())) != 0
	  || (ret = local_setegid (__getgid ())) != 0))
    goto fail;

  /* Execute the file actions.  */
  if (file_actions != 0)
    {
      int cnt;
      struct rlimit64 fdlimit;
      bool have_fdlimit = false;

      for (cnt = 0; cnt < file_actions->__used; ++cnt)
	{
	  struct __spawn_action *action = &file_actions->__actions[cnt];

	  /* Dup the pipe fd onto an unoccupied one to avoid any file
	     operation to clobber it.  */
	  if ((action->action.close_action.fd == p)
	      || (action->action.open_action.fd == p)
	      || (action->action.dup2_action.fd == p))
	    {
	      if ((ret = __dup (p)) < 0)
		goto fail;
	      p = ret;
	    }

	  switch (action->tag)
	    {
	    case spawn_do_close:
	      if ((ret =
		   close_not_cancel (action->action.close_action.fd)) != 0)
		{
		  if (!have_fdlimit)
		    {
		      __getrlimit64 (RLIMIT_NOFILE, &fdlimit);
		      have_fdlimit = true;
		    }

		  /* Signal errors only for file descriptors out of range.  */
		  if (action->action.close_action.fd < 0
		      || action->action.close_action.fd >= fdlimit.rlim_cur)
		    goto fail;
		}
	      break;

	    case spawn_do_open:
	      {
		ret = open_not_cancel (action->action.open_action.path,
				       action->action.
				       open_action.oflag | O_LARGEFILE,
				       action->action.open_action.mode);

		if (ret == -1)
		  goto fail;

		int new_fd = ret;

		/* Make sure the desired file descriptor is used.  */
		if (ret != action->action.open_action.fd)
		  {
		    if ((ret = __dup2 (new_fd, action->action.open_action.fd))
			!= action->action.open_action.fd)
		      goto fail;

		    if ((ret = close_not_cancel (new_fd)) != 0)
		      goto fail;
		  }
	      }
	      break;

	    case spawn_do_dup2:
	      if ((ret = __dup2 (action->action.dup2_action.fd,
				 action->action.dup2_action.newfd))
		  != action->action.dup2_action.newfd)
		goto fail;
	      break;
	    }
	}
    }

  /* Set the initial signal mask of the child if POSIX_SPAWN_SETSIGMASK
     is set, otherwise restore the previous one.  */
  __sigprocmask (SIG_SETMASK, (attr->__flags & POSIX_SPAWN_SETSIGMASK)
		 ? &attr->__ss : &args->oldmask, 0);

  args->exec (args->file, args->argv, args->envp);

  /* This is compatibility function required to enable posix_spawn run
     script without shebang definition for older posix_spawn versions
     (2.15).  */
  maybe_script_execute (args);

  ret = -errno;

fail:
  /* Since sizeof errno < PIPE_BUF, the write is atomic. */
  ret = -ret;
  if (ret)
    while (write_not_cancel (p, &ret, sizeof ret) < 0)
      continue;
  exit (SPAWN_ERROR);
}
예제 #6
0
int
internal_function
__gconv_load_cache (void)
{
  int fd;
  struct stat64 st;
  struct gconvcache_header *header;

  /* We cannot use the cache if the GCONV_PATH environment variable is
     set.  */
  __gconv_path_envvar = getenv ("GCONV_PATH");
  if (__gconv_path_envvar != NULL)
    return -1;

  /* See whether the cache file exists.  */
  fd = open_not_cancel (GCONV_MODULES_CACHE, O_RDONLY, 0);
  if (__builtin_expect (fd, 0) == -1)
    /* Not available.  */
    return -1;

  /* Get information about the file.  */
  if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0
      /* We do not have to start looking at the file if it cannot contain
	 at least the cache header.  */
      || (size_t) st.st_size < sizeof (struct gconvcache_header))
    {
    close_and_exit:
      close_not_cancel_no_status (fd);
      return -1;
    }

  /* Make the file content available.  */
  cache_size = st.st_size;
#ifdef _POSIX_MAPPED_FILES
  gconv_cache = __mmap (NULL, cache_size, PROT_READ, MAP_SHARED, fd, 0);
  if (__builtin_expect (gconv_cache == MAP_FAILED, 0))
#endif
    {
      size_t already_read;

      gconv_cache = malloc (cache_size);
      if (gconv_cache == NULL)
	goto close_and_exit;

      already_read = 0;
      do
	{
	  ssize_t n = __read (fd, (char *) gconv_cache + already_read,
			      cache_size - already_read);
	  if (__builtin_expect (n, 0) == -1)
	    {
	      free (gconv_cache);
	      gconv_cache = NULL;
	      goto close_and_exit;
	    }

	  already_read += n;
	}
      while (already_read < cache_size);

      cache_malloced = 1;
    }

  /* We don't need the file descriptor anymore.  */
  close_not_cancel_no_status (fd);

  /* Check the consistency.  */
  header = (struct gconvcache_header *) gconv_cache;
  if (__builtin_expect (header->magic, GCONVCACHE_MAGIC) != GCONVCACHE_MAGIC
      || __builtin_expect (header->string_offset >= cache_size, 0)
      || __builtin_expect (header->hash_offset >= cache_size, 0)
      || __builtin_expect (header->hash_size == 0, 0)
      || __builtin_expect ((header->hash_offset
			    + header->hash_size * sizeof (struct hash_entry))
			   > cache_size, 0)
      || __builtin_expect (header->module_offset >= cache_size, 0)
      || __builtin_expect (header->otherconv_offset > cache_size, 0))
    {
      if (cache_malloced)
	{
	  free (gconv_cache);
	  cache_malloced = 0;
	}
#ifdef _POSIX_MAPPED_FILES
      else
	__munmap (gconv_cache, cache_size);
#endif
      gconv_cache = NULL;

      return -1;
    }

  /* That worked.  */
  return 0;
}