posix/tst-spawn5.c

   1 /* Tests for posix_spawn signal handling.
   2    Copyright (C) 2021-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <getopt.h>
  22 #include <spawn.h>
  23 #include <fcntl.h>
  24 #include <sys/wait.h>
  25 #include <dirent.h>
  26 #include <stdbool.h>
  27 #include <errno.h>
  28 #include <limits.h>
  29
  30 #include <support/check.h>
  31 #include <support/xunistd.h>
  32 #include <support/support.h>
  33
  34 #include <arch-fd_to_filename.h>
  35 #include <array_length.h>
  36
  37 /* Nonzero if the program gets called via `exec'.  */
  38 static int restart;
  39
  40 /* Hold the four initial argument used to respawn the process, plus
  41    the extra '--direct' and '--restart', and a final NULL.  */
  42 static char *initial_argv[7];
  43 static int initial_argv_count;
  44
  45 #define CMDLINE_OPTIONS \
  46   { "restart", no_argument, &restart, 1 },
  47
  48 #define NFDS 100
  49
  50 static int
  51 parse_fd (const char *str)
  52 {
  53   char *endptr;
  54   long unsigned int fd = strtoul (str, &endptr, 10);
  55   if (*endptr != '\0' || fd > INT_MAX)
  56     FAIL_EXIT1 ("invalid file descriptor value: %s", str);
  57   return fd;
  58 }
  59
  60 /* Called on process re-execution.  The arguments are the expected opened
  61    file descriptors.  */
  62 _Noreturn static void
  63 handle_restart (int argc, char *argv[])
  64 {
  65   TEST_VERIFY (argc > 0);
  66   int lowfd = parse_fd (argv[0]);
  67
  68   size_t nfds = argc > 1 ? argc - 1 : 0;
  69   struct fd_t
  70   {
  71     int fd;
  72     _Bool found;
  73   } *fds = xmalloc (sizeof (struct fd_t) * nfds);
  74   for (int i = 0; i < nfds; i++)
  75     {
  76       fds[i].fd = parse_fd (argv[i + 1]);
  77       fds[i].found = false;
  78     }
  79
  80   DIR *dirp = opendir (FD_TO_FILENAME_PREFIX);
  81   if (dirp == NULL)
  82     FAIL_EXIT1 ("opendir (\"" FD_TO_FILENAME_PREFIX "\"): %m");
  83
  84   while (true)
  85     {
  86       errno = 0;
  87       struct dirent64 *e = readdir64 (dirp);
  88       if (e == NULL)
  89         {
  90           if (errno != 0)
  91             FAIL_EXIT1 ("readdir: %m");
  92           break;
  93         }
  94
  95       if (e->d_name[0] == '.')
  96         continue;
  97
  98       char *endptr;
  99       long int fd = strtol (e->d_name, &endptr, 10);
 100       if (*endptr != '\0' || fd < 0 || fd > INT_MAX)
 101         FAIL_EXIT1 ("readdir: invalid file descriptor name: /proc/self/fd/%s",
 102                     e->d_name);
 103
 104       /* Ignore the descriptors not in the range of the opened files.  */
 105       if (fd < lowfd || fd == dirfd (dirp))
 106         continue;
 107
 108       bool found = false;
 109       for (int i = 0; i < nfds; i++)
 110         if (fds[i].fd == fd)
 111           fds[i].found = found = true;
 112
 113       if (!found)
 114         {
 115           char *path = xasprintf ("/proc/self/fd/%s", e->d_name);
 116           char *resolved = xreadlink (path);
 117           FAIL_EXIT1 ("unexpected open file descriptor %ld: %s", fd, resolved);
 118         }
 119     }
 120   closedir (dirp);
 121
 122   for (int i = 0; i < nfds; i++)
 123     if (!fds[i].found)
 124       FAIL_EXIT1 ("file descriptor %d not opened", fds[i].fd);
 125
 126   free (fds);
 127
 128   exit (EXIT_SUCCESS);
 129 }
 130
 131 static void
 132 spawn_closefrom_test (posix_spawn_file_actions_t *fa, int lowfd, int highfd,
 133                       int *extrafds, size_t nextrafds)
 134 {
 135   /* 3 or 7 elements from initial_argv:
 136        + path to ld.so          optional
 137        + --library-path         optional
 138        + the library path       optional
 139        + application name
 140        + --direct
 141        + --restart
 142        + lowest opened file descriptor
 143        + up to 2 * maximum_fd arguments (the expected open file descriptors),
 144          plus NULL.  */
 145
 146   int argv_size = initial_argv_count + 2 * NFDS + 1;
 147   char *args[argv_size];
 148   int argc = 0;
 149
 150   for (char **arg = initial_argv; *arg != NULL; arg++)
 151     args[argc++] = *arg;
 152
 153   args[argc++] = xasprintf ("%d", lowfd);
 154
 155   for (int i = lowfd; i < highfd; i++)
 156     args[argc++] = xasprintf ("%d", i);
 157
 158   for (int i = 0; i < nextrafds; i++)
 159     args[argc++] = xasprintf ("%d", extrafds[i]);
 160
 161   args[argc] = NULL;
 162   TEST_VERIFY (argc < argv_size);
 163
 164   pid_t pid;
 165   int status;
 166
 167   TEST_COMPARE (posix_spawn (&pid, args[0], fa, NULL, args, environ), 0);
 168   TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
 169   TEST_VERIFY (WIFEXITED (status));
 170   TEST_VERIFY (!WIFSIGNALED (status));
 171   TEST_COMPARE (WEXITSTATUS (status), 0);
 172 }
 173
 174 static void
 175 do_test_closefrom (void)
 176 {
 177   int lowfd = support_open_dev_null_range (NFDS, O_RDONLY, 0600);
 178   const int half_fd = lowfd + NFDS / 2;
 179
 180   /* Close half of the descriptors and check result.  */
 181   {
 182     posix_spawn_file_actions_t fa;
 183     TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
 184
 185     int ret = posix_spawn_file_actions_addclosefrom_np (&fa, half_fd);
 186     if (ret == EINVAL)
 187       /* Hurd currently does not support closefrom fileaction.  */
 188       FAIL_UNSUPPORTED ("posix_spawn_file_actions_addclosefrom_np unsupported");
 189     TEST_COMPARE (ret, 0);
 190
 191     spawn_closefrom_test (&fa, lowfd, half_fd, NULL, 0);
 192
 193     TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
 194   }
 195
 196   /* Create some gaps, close up to a threshold, and check result.  */
 197   xclose (lowfd + 57);
 198   xclose (lowfd + 78);
 199   xclose (lowfd + 81);
 200   xclose (lowfd + 82);
 201   xclose (lowfd + 84);
 202   xclose (lowfd + 90);
 203
 204   {
 205     posix_spawn_file_actions_t fa;
 206     TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
 207
 208     TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, half_fd), 0);
 209
 210     spawn_closefrom_test (&fa, lowfd, half_fd, NULL, 0);
 211
 212     TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
 213   }
 214
 215   /* Close the remaining but the last one.  */
 216   {
 217     posix_spawn_file_actions_t fa;
 218     TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
 219
 220     TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, lowfd + 1), 0);
 221
 222     spawn_closefrom_test (&fa, lowfd, lowfd + 1, NULL, 0);
 223
 224     TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
 225   }
 226
 227   /* Close everything.  */
 228   {
 229     posix_spawn_file_actions_t fa;
 230     TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
 231
 232     TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, lowfd), 0);
 233
 234     spawn_closefrom_test (&fa, lowfd, lowfd, NULL, 0);
 235
 236     TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
 237   }
 238
 239   /* Close a range and add some file actions.  */
 240   {
 241     posix_spawn_file_actions_t fa;
 242     TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0);
 243
 244     TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, lowfd + 1), 0);
 245     TEST_COMPARE (posix_spawn_file_actions_addopen (&fa, lowfd, "/dev/null",
 246                                                     0666, O_RDONLY), 0);
 247     TEST_COMPARE (posix_spawn_file_actions_adddup2 (&fa, lowfd, lowfd + 1), 0);
 248     TEST_COMPARE (posix_spawn_file_actions_addopen (&fa, lowfd, "/dev/null",
 249                                                     0666, O_RDONLY), 0);
 250
 251     spawn_closefrom_test (&fa, lowfd, lowfd, (int[]){lowfd, lowfd + 1}, 2);
 252
 253     TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0);
 254   }
 255 }
 256
 257 static int
 258 do_test (int argc, char *argv[])
 259 {
 260   /* We must have either:
 261
 262      - one or four parameters if called initially:
 263        + argv[1]: path for ld.so        optional
 264        + argv[2]: "--library-path"      optional
 265        + argv[3]: the library path      optional
 266        + argv[4]: the application name
 267
 268      - six parameters left if called through re-execution:
 269        + argv[1]: the application name
 270        + argv[2]: the lowest file descriptor expected
 271        + argv[3]: first expected open file descriptor   optional
 272        + argv[n]: last expected open file descritptor   optional
 273
 274      * When built with --enable-hardcoded-path-in-tests or issued without
 275        using the loader directly.  */
 276
 277   if (restart)
 278     /* Ignore the application name. */
 279     handle_restart (argc - 1, &argv[1]);
 280
 281   TEST_VERIFY_EXIT (argc == 2 || argc == 5);
 282
 283   int i;
 284
 285   for (i = 0; i < argc - 1; i++)
 286     initial_argv[i] = argv[i + 1];
 287   initial_argv[i++] = (char *) "--direct";
 288   initial_argv[i++] = (char *) "--restart";
 289
 290   initial_argv_count = i;
 291
 292   do_test_closefrom ();
 293
 294   return 0;
 295 }
 296
 297 #define TEST_FUNCTION_ARGV do_test
 298 #include <support/test-driver.c>