1 // SPDX-License-Identifier: GPL-2.0 2 #define _GNU_SOURCE 3 #define __SANE_USERSPACE_TYPES__ // Use ll64 4 5 #include <fcntl.h> 6 #include <sched.h> 7 #include <stdio.h> 8 #include <string.h> 9 #include <sys/stat.h> 10 #include <sys/mount.h> 11 #include <unistd.h> 12 13 #include "../../kselftest_harness.h" 14 #include "log.h" 15 #include "wrappers.h" 16 17 FIXTURE(set_layers_via_fds) { 18 }; 19 20 FIXTURE_SETUP(set_layers_via_fds) 21 { 22 ASSERT_EQ(mkdir("/set_layers_via_fds", 0755), 0); 23 ASSERT_EQ(mkdir("/set_layers_via_fds_tmpfs", 0755), 0); 24 } 25 26 FIXTURE_TEARDOWN(set_layers_via_fds) 27 { 28 umount2("/set_layers_via_fds", 0); 29 ASSERT_EQ(rmdir("/set_layers_via_fds"), 0); 30 31 umount2("/set_layers_via_fds_tmpfs", 0); 32 ASSERT_EQ(rmdir("/set_layers_via_fds_tmpfs"), 0); 33 } 34 35 TEST_F(set_layers_via_fds, set_layers_via_fds) 36 { 37 int fd_context, fd_tmpfs, fd_overlay; 38 int layer_fds[] = { [0 ... 8] = -EBADF }; 39 bool layers_found[] = { [0 ... 8] = false }; 40 size_t len = 0; 41 char *line = NULL; 42 FILE *f_mountinfo; 43 44 ASSERT_EQ(unshare(CLONE_NEWNS), 0); 45 ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); 46 47 fd_context = sys_fsopen("tmpfs", 0); 48 ASSERT_GE(fd_context, 0); 49 50 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 51 fd_tmpfs = sys_fsmount(fd_context, 0, 0); 52 ASSERT_GE(fd_tmpfs, 0); 53 ASSERT_EQ(close(fd_context), 0); 54 55 ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0); 56 ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); 57 ASSERT_EQ(mkdirat(fd_tmpfs, "l1", 0755), 0); 58 ASSERT_EQ(mkdirat(fd_tmpfs, "l2", 0755), 0); 59 ASSERT_EQ(mkdirat(fd_tmpfs, "l3", 0755), 0); 60 ASSERT_EQ(mkdirat(fd_tmpfs, "l4", 0755), 0); 61 ASSERT_EQ(mkdirat(fd_tmpfs, "d1", 0755), 0); 62 ASSERT_EQ(mkdirat(fd_tmpfs, "d2", 0755), 0); 63 ASSERT_EQ(mkdirat(fd_tmpfs, "d3", 0755), 0); 64 65 layer_fds[0] = openat(fd_tmpfs, "w", O_DIRECTORY); 66 ASSERT_GE(layer_fds[0], 0); 67 68 layer_fds[1] = openat(fd_tmpfs, "u", O_DIRECTORY); 69 ASSERT_GE(layer_fds[1], 0); 70 71 layer_fds[2] = openat(fd_tmpfs, "l1", O_DIRECTORY); 72 ASSERT_GE(layer_fds[2], 0); 73 74 layer_fds[3] = openat(fd_tmpfs, "l2", O_DIRECTORY); 75 ASSERT_GE(layer_fds[3], 0); 76 77 layer_fds[4] = openat(fd_tmpfs, "l3", O_DIRECTORY); 78 ASSERT_GE(layer_fds[4], 0); 79 80 layer_fds[5] = openat(fd_tmpfs, "l4", O_DIRECTORY); 81 ASSERT_GE(layer_fds[5], 0); 82 83 layer_fds[6] = openat(fd_tmpfs, "d1", O_DIRECTORY); 84 ASSERT_GE(layer_fds[6], 0); 85 86 layer_fds[7] = openat(fd_tmpfs, "d2", O_DIRECTORY); 87 ASSERT_GE(layer_fds[7], 0); 88 89 layer_fds[8] = openat(fd_tmpfs, "d3", O_DIRECTORY); 90 ASSERT_GE(layer_fds[8], 0); 91 92 ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0); 93 ASSERT_EQ(close(fd_tmpfs), 0); 94 95 fd_context = sys_fsopen("overlay", 0); 96 ASSERT_GE(fd_context, 0); 97 98 ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir", NULL, layer_fds[2]), 0); 99 100 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, layer_fds[0]), 0); 101 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, layer_fds[1]), 0); 102 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[2]), 0); 103 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[3]), 0); 104 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[4]), 0); 105 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[5]), 0); 106 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[6]), 0); 107 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[7]), 0); 108 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[8]), 0); 109 110 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_STRING, "metacopy", "on", 0), 0); 111 112 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 113 114 fd_overlay = sys_fsmount(fd_context, 0, 0); 115 ASSERT_GE(fd_overlay, 0); 116 117 ASSERT_EQ(sys_move_mount(fd_overlay, "", -EBADF, "/set_layers_via_fds", MOVE_MOUNT_F_EMPTY_PATH), 0); 118 119 f_mountinfo = fopen("/proc/self/mountinfo", "r"); 120 ASSERT_NE(f_mountinfo, NULL); 121 122 while (getline(&line, &len, f_mountinfo) != -1) { 123 char *haystack = line; 124 125 if (strstr(haystack, "workdir=/tmp/w")) 126 layers_found[0] = true; 127 if (strstr(haystack, "upperdir=/tmp/u")) 128 layers_found[1] = true; 129 if (strstr(haystack, "lowerdir+=/tmp/l1")) 130 layers_found[2] = true; 131 if (strstr(haystack, "lowerdir+=/tmp/l2")) 132 layers_found[3] = true; 133 if (strstr(haystack, "lowerdir+=/tmp/l3")) 134 layers_found[4] = true; 135 if (strstr(haystack, "lowerdir+=/tmp/l4")) 136 layers_found[5] = true; 137 if (strstr(haystack, "datadir+=/tmp/d1")) 138 layers_found[6] = true; 139 if (strstr(haystack, "datadir+=/tmp/d2")) 140 layers_found[7] = true; 141 if (strstr(haystack, "datadir+=/tmp/d3")) 142 layers_found[8] = true; 143 } 144 free(line); 145 146 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 147 ASSERT_EQ(layers_found[i], true); 148 ASSERT_EQ(close(layer_fds[i]), 0); 149 } 150 151 ASSERT_EQ(close(fd_context), 0); 152 ASSERT_EQ(close(fd_overlay), 0); 153 ASSERT_EQ(fclose(f_mountinfo), 0); 154 } 155 156 TEST_F(set_layers_via_fds, set_500_layers_via_fds) 157 { 158 int fd_context, fd_tmpfs, fd_overlay, fd_work, fd_upper, fd_lower; 159 int layer_fds[500] = { [0 ... 499] = -EBADF }; 160 161 ASSERT_EQ(unshare(CLONE_NEWNS), 0); 162 ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); 163 164 fd_context = sys_fsopen("tmpfs", 0); 165 ASSERT_GE(fd_context, 0); 166 167 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 168 fd_tmpfs = sys_fsmount(fd_context, 0, 0); 169 ASSERT_GE(fd_tmpfs, 0); 170 ASSERT_EQ(close(fd_context), 0); 171 172 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 173 char path[100]; 174 175 sprintf(path, "l%d", i); 176 ASSERT_EQ(mkdirat(fd_tmpfs, path, 0755), 0); 177 layer_fds[i] = openat(fd_tmpfs, path, O_DIRECTORY); 178 ASSERT_GE(layer_fds[i], 0); 179 } 180 181 ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0); 182 fd_work = openat(fd_tmpfs, "w", O_DIRECTORY); 183 ASSERT_GE(fd_work, 0); 184 185 ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); 186 fd_upper = openat(fd_tmpfs, "u", O_DIRECTORY); 187 ASSERT_GE(fd_upper, 0); 188 189 ASSERT_EQ(mkdirat(fd_tmpfs, "l501", 0755), 0); 190 fd_lower = openat(fd_tmpfs, "l501", O_DIRECTORY); 191 ASSERT_GE(fd_lower, 0); 192 193 ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0); 194 ASSERT_EQ(close(fd_tmpfs), 0); 195 196 fd_context = sys_fsopen("overlay", 0); 197 ASSERT_GE(fd_context, 0); 198 199 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, fd_work), 0); 200 ASSERT_EQ(close(fd_work), 0); 201 202 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, fd_upper), 0); 203 ASSERT_EQ(close(fd_upper), 0); 204 205 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 206 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[i]), 0); 207 ASSERT_EQ(close(layer_fds[i]), 0); 208 } 209 210 ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower), 0); 211 ASSERT_EQ(close(fd_lower), 0); 212 213 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 214 215 fd_overlay = sys_fsmount(fd_context, 0, 0); 216 ASSERT_GE(fd_overlay, 0); 217 ASSERT_EQ(close(fd_context), 0); 218 ASSERT_EQ(close(fd_overlay), 0); 219 } 220 221 TEST_F(set_layers_via_fds, set_500_layers_via_opath_fds) 222 { 223 int fd_context, fd_tmpfs, fd_overlay, fd_work, fd_upper, fd_lower; 224 int layer_fds[500] = { [0 ... 499] = -EBADF }; 225 226 ASSERT_EQ(unshare(CLONE_NEWNS), 0); 227 ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); 228 229 fd_context = sys_fsopen("tmpfs", 0); 230 ASSERT_GE(fd_context, 0); 231 232 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 233 fd_tmpfs = sys_fsmount(fd_context, 0, 0); 234 ASSERT_GE(fd_tmpfs, 0); 235 ASSERT_EQ(close(fd_context), 0); 236 237 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 238 char path[100]; 239 240 sprintf(path, "l%d", i); 241 ASSERT_EQ(mkdirat(fd_tmpfs, path, 0755), 0); 242 layer_fds[i] = openat(fd_tmpfs, path, O_DIRECTORY | O_PATH); 243 ASSERT_GE(layer_fds[i], 0); 244 } 245 246 ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0); 247 fd_work = openat(fd_tmpfs, "w", O_DIRECTORY | O_PATH); 248 ASSERT_GE(fd_work, 0); 249 250 ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); 251 fd_upper = openat(fd_tmpfs, "u", O_DIRECTORY | O_PATH); 252 ASSERT_GE(fd_upper, 0); 253 254 ASSERT_EQ(mkdirat(fd_tmpfs, "l501", 0755), 0); 255 fd_lower = openat(fd_tmpfs, "l501", O_DIRECTORY | O_PATH); 256 ASSERT_GE(fd_lower, 0); 257 258 ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0); 259 ASSERT_EQ(close(fd_tmpfs), 0); 260 261 fd_context = sys_fsopen("overlay", 0); 262 ASSERT_GE(fd_context, 0); 263 264 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, fd_work), 0); 265 ASSERT_EQ(close(fd_work), 0); 266 267 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, fd_upper), 0); 268 ASSERT_EQ(close(fd_upper), 0); 269 270 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 271 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[i]), 0); 272 ASSERT_EQ(close(layer_fds[i]), 0); 273 } 274 275 ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, fd_lower), 0); 276 ASSERT_EQ(close(fd_lower), 0); 277 278 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 279 280 fd_overlay = sys_fsmount(fd_context, 0, 0); 281 ASSERT_GE(fd_overlay, 0); 282 ASSERT_EQ(close(fd_context), 0); 283 ASSERT_EQ(close(fd_overlay), 0); 284 } 285 286 TEST_F(set_layers_via_fds, set_layers_via_detached_mount_fds) 287 { 288 int fd_context, fd_tmpfs, fd_overlay, fd_tmp; 289 int layer_fds[] = { [0 ... 8] = -EBADF }; 290 bool layers_found[] = { [0 ... 8] = false }; 291 size_t len = 0; 292 char *line = NULL; 293 FILE *f_mountinfo; 294 295 ASSERT_EQ(unshare(CLONE_NEWNS), 0); 296 ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); 297 298 fd_context = sys_fsopen("tmpfs", 0); 299 ASSERT_GE(fd_context, 0); 300 301 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 302 fd_tmpfs = sys_fsmount(fd_context, 0, 0); 303 ASSERT_GE(fd_tmpfs, 0); 304 ASSERT_EQ(close(fd_context), 0); 305 306 ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); 307 ASSERT_EQ(mkdirat(fd_tmpfs, "u/upper", 0755), 0); 308 ASSERT_EQ(mkdirat(fd_tmpfs, "u/work", 0755), 0); 309 ASSERT_EQ(mkdirat(fd_tmpfs, "l1", 0755), 0); 310 ASSERT_EQ(mkdirat(fd_tmpfs, "l2", 0755), 0); 311 ASSERT_EQ(mkdirat(fd_tmpfs, "l3", 0755), 0); 312 ASSERT_EQ(mkdirat(fd_tmpfs, "l4", 0755), 0); 313 ASSERT_EQ(mkdirat(fd_tmpfs, "d1", 0755), 0); 314 ASSERT_EQ(mkdirat(fd_tmpfs, "d2", 0755), 0); 315 ASSERT_EQ(mkdirat(fd_tmpfs, "d3", 0755), 0); 316 317 ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/set_layers_via_fds_tmpfs", MOVE_MOUNT_F_EMPTY_PATH), 0); 318 319 fd_tmp = open_tree(fd_tmpfs, "u", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC); 320 ASSERT_GE(fd_tmp, 0); 321 322 layer_fds[0] = openat(fd_tmp, "upper", O_CLOEXEC | O_DIRECTORY | O_PATH); 323 ASSERT_GE(layer_fds[0], 0); 324 325 layer_fds[1] = openat(fd_tmp, "work", O_CLOEXEC | O_DIRECTORY | O_PATH); 326 ASSERT_GE(layer_fds[1], 0); 327 328 layer_fds[2] = open_tree(fd_tmpfs, "l1", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC); 329 ASSERT_GE(layer_fds[2], 0); 330 331 layer_fds[3] = open_tree(fd_tmpfs, "l2", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC); 332 ASSERT_GE(layer_fds[3], 0); 333 334 layer_fds[4] = open_tree(fd_tmpfs, "l3", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC); 335 ASSERT_GE(layer_fds[4], 0); 336 337 layer_fds[5] = open_tree(fd_tmpfs, "l4", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC); 338 ASSERT_GE(layer_fds[5], 0); 339 340 layer_fds[6] = open_tree(fd_tmpfs, "d1", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC); 341 ASSERT_GE(layer_fds[6], 0); 342 343 layer_fds[7] = open_tree(fd_tmpfs, "d2", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC); 344 ASSERT_GE(layer_fds[7], 0); 345 346 layer_fds[8] = open_tree(fd_tmpfs, "d3", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC); 347 ASSERT_GE(layer_fds[8], 0); 348 349 ASSERT_EQ(close(fd_tmpfs), 0); 350 351 fd_context = sys_fsopen("overlay", 0); 352 ASSERT_GE(fd_context, 0); 353 354 ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir", NULL, layer_fds[2]), 0); 355 356 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, layer_fds[0]), 0); 357 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, layer_fds[1]), 0); 358 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[2]), 0); 359 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[3]), 0); 360 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[4]), 0); 361 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[5]), 0); 362 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[6]), 0); 363 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[7]), 0); 364 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[8]), 0); 365 366 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_STRING, "metacopy", "on", 0), 0); 367 368 ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); 369 370 fd_overlay = sys_fsmount(fd_context, 0, 0); 371 ASSERT_GE(fd_overlay, 0); 372 373 ASSERT_EQ(sys_move_mount(fd_overlay, "", -EBADF, "/set_layers_via_fds", MOVE_MOUNT_F_EMPTY_PATH), 0); 374 375 f_mountinfo = fopen("/proc/self/mountinfo", "r"); 376 ASSERT_NE(f_mountinfo, NULL); 377 378 while (getline(&line, &len, f_mountinfo) != -1) { 379 char *haystack = line; 380 381 if (strstr(haystack, "workdir=/tmp/w")) 382 layers_found[0] = true; 383 if (strstr(haystack, "upperdir=/tmp/u")) 384 layers_found[1] = true; 385 if (strstr(haystack, "lowerdir+=/tmp/l1")) 386 layers_found[2] = true; 387 if (strstr(haystack, "lowerdir+=/tmp/l2")) 388 layers_found[3] = true; 389 if (strstr(haystack, "lowerdir+=/tmp/l3")) 390 layers_found[4] = true; 391 if (strstr(haystack, "lowerdir+=/tmp/l4")) 392 layers_found[5] = true; 393 if (strstr(haystack, "datadir+=/tmp/d1")) 394 layers_found[6] = true; 395 if (strstr(haystack, "datadir+=/tmp/d2")) 396 layers_found[7] = true; 397 if (strstr(haystack, "datadir+=/tmp/d3")) 398 layers_found[8] = true; 399 } 400 free(line); 401 402 for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) { 403 ASSERT_EQ(layers_found[i], true); 404 ASSERT_EQ(close(layer_fds[i]), 0); 405 } 406 407 ASSERT_EQ(close(fd_context), 0); 408 ASSERT_EQ(close(fd_overlay), 0); 409 ASSERT_EQ(fclose(f_mountinfo), 0); 410 } 411 412 TEST_HARNESS_MAIN 413