1  /* Copyright (C) 2017-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <unistd.h>
      19  #include <errno.h>
      20  #include <fcntl.h>
      21  #include <sys/wait.h>
      22  
      23  #include <support/check.h>
      24  
      25  /* Try executing "/bin/sh -c true", using FD opened on /bin/sh.  */
      26  static int
      27  try_fexecve (int fd)
      28  {
      29    pid_t pid = fork ();
      30  
      31    if (pid == 0)
      32      {
      33        static const char *const argv[] = {
      34  	"/bin/sh", "-c", "true", NULL
      35        };
      36        fexecve (fd, (char *const *) argv, environ);
      37        _exit (errno);
      38      }
      39    if (pid < 0)
      40      FAIL_RET ("fork failed: %m");
      41  
      42    pid_t termpid;
      43    int status;
      44    termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
      45    if (termpid == -1)
      46      FAIL_RET ("waitpid failed: %m");
      47    if (termpid != pid)
      48      FAIL_RET ("waitpid returned %ld != %ld",
      49  	      (long int) termpid, (long int) pid);
      50    if (!WIFEXITED (status))
      51      FAIL_RET ("child hasn't exited normally");
      52  
      53    /* If fexecve is unimplemented mark this test as UNSUPPORTED.  */
      54    if (WEXITSTATUS (status) == ENOSYS)
      55      FAIL_UNSUPPORTED ("fexecve is unimplemented");
      56  
      57    if (WEXITSTATUS (status) != 0)
      58      {
      59        errno = WEXITSTATUS (status);
      60        FAIL_RET ("fexecve failed: %m");
      61      }
      62    return 0;
      63  }
      64  
      65  static int
      66  do_test (void)
      67  {
      68    int fd;
      69    int ret;
      70  
      71    fd = open ("/bin/sh", O_RDONLY);
      72    if (fd < 0)
      73      FAIL_UNSUPPORTED ("/bin/sh cannot be opened: %m");
      74    ret = try_fexecve (fd);
      75    close (fd);
      76  
      77  #ifdef O_PATH
      78    fd = open ("/bin/sh", O_RDONLY | O_PATH);
      79    if (fd < 0)
      80      FAIL_UNSUPPORTED ("/bin/sh cannot be opened (O_PATH): %m");
      81    ret |= try_fexecve (fd);
      82    close (fd);
      83  #endif
      84  
      85    return ret;
      86  }
      87  
      88  #include <support/test-driver.c>