| 1 | /*++ |
| 2 | |
| 3 | Copyright (c) Microsoft. All rights reserved. |
| 4 | |
| 5 | Module Name: |
| 6 | |
| 7 | Namespace.c |
| 8 | |
| 9 | Abstract: |
| 10 | |
| 11 | This file is a Namespace test. |
| 12 | |
| 13 | --*/ |
| 14 | |
| 15 | #include "lxtcommon.h" |
| 16 | #include "unittests.h" |
| 17 | #include <fcntl.h> |
| 18 | #include <unistd.h> |
| 19 | #include <sys/mount.h> |
| 20 | #include <sys/sysmacros.h> |
| 21 | #include <sys/types.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <stddef.h> |
| 28 | #include <dirent.h> |
| 29 | #include <ctype.h> |
| 30 | #include <sys/mman.h> |
| 31 | #include <sys/utsname.h> |
| 32 | #include <sys/ipc.h> |
| 33 | #include <sys/shm.h> |
| 34 | #include <sys/ioctl.h> |
| 35 | #include <sys/wait.h> |
| 36 | #include <net/if.h> |
| 37 | #include <bits/local_lim.h> |
| 38 | #include <linux/capability.h> |
| 39 | #include <linux/futex.h> |
| 40 | #include <linux/net_namespace.h> |
| 41 | #include <linux/netlink.h> |
| 42 | #include <linux/rtnetlink.h> |
| 43 | #include <linux/reboot.h> |
| 44 | |
| 45 | #define LXT_NAME "Namespace" |
| 46 | #define SOCKET_LOOPBACK_IF_NAME "lo" |
| 47 | |
| 48 | #define LxtReboot(_magic1, _magic2, _cmd, _arg) (syscall(SYS_reboot, (_magic1), (_magic2), (_cmd), (_arg))) |
| 49 | |
| 50 | int NamespaceNetwork(PLXT_ARGS Args); |
| 51 | |
| 52 | int NamespaceNetworkProcfs(PLXT_ARGS Args); |
| 53 | |
| 54 | int NamespaceNetworkProcfsCheckFile(char* File, int ExpectedLineCount); |
| 55 | |
| 56 | int NamespaceSetNs(PLXT_ARGS Args); |
| 57 | |
| 58 | int NamespaceStat(PLXT_ARGS Args); |
| 59 | |
| 60 | int NamespacePid(PLXT_ARGS Args); |
| 61 | |
| 62 | int NamespacePidCheckProcPidStatStatusFiles(char* Dir); |
| 63 | |
| 64 | void* NamespacePidChildPThread(void* Args); |
| 65 | |
| 66 | int NamespacePidGetProcPidFolderCount(char* Dir, int* Count); |
| 67 | |
| 68 | int NamespacePidBasic(int Level); |
| 69 | |
| 70 | int NamespacePidBasicChild(void* Param); |
| 71 | |
| 72 | int NamespacePidParentPThread(void); |
| 73 | |
| 74 | int NamespaceUts(PLXT_ARGS Args); |
| 75 | |
| 76 | int NamespaceIpc(PLXT_ARGS Args); |
| 77 | |
| 78 | int NamespaceCloneInvalid(PLXT_ARGS Args); |
| 79 | |
| 80 | // |
| 81 | // Global constants |
| 82 | // |
| 83 | |
| 84 | static const LXT_VARIATION g_LxtVariations[] = { |
| 85 | {"NamespaceSetNs", NamespaceSetNs}, |
| 86 | {"NamespaceStat", NamespaceStat}, |
| 87 | {"Namespace UTS", NamespaceUts}, |
| 88 | {"Namespace PID", NamespacePid}, |
| 89 | {"Namespace Network", NamespaceNetwork}, |
| 90 | {"Namespace Network - reading /proc/<pid>/net", NamespaceNetworkProcfs}, |
| 91 | {"Namespace IPC", NamespaceIpc}, |
| 92 | {"Namespace Clone - invalid namespace flags", NamespaceCloneInvalid}}; |
| 93 | |
| 94 | typedef struct _LXT_NAMESPACE_DATA |
| 95 | { |
| 96 | const char* Name; |
| 97 | int NsType; |
| 98 | } LXT_NAMESPACE_DATA, *PLXT_NAMESPACE_DATA; |
| 99 | |
| 100 | static const LXT_NAMESPACE_DATA g_LxtNamespaces[] = { |
| 101 | {"ipc", CLONE_NEWIPC}, {"mnt", CLONE_NEWNS}, {"net", CLONE_NEWNET}, {"pid", CLONE_NEWPID}, {"user", CLONE_NEWUSER}, {"uts", CLONE_NEWUTS}}; |
| 102 | |
| 103 | int NamespaceTestEntry(int Argc, char* Argv[]) |
| 104 | |
| 105 | /*++ |
| 106 | --*/ |
| 107 | |
| 108 | { |
| 109 | |
| 110 | LXT_ARGS Args; |
| 111 | int Result; |
| 112 | |
| 113 | LxtCheckResult(LxtInitialize(Argc, Argv, &Args, LXT_NAME)); |
| 114 | LxtCheckResult(LxtRunVariations(&Args, g_LxtVariations, LXT_COUNT_OF(g_LxtVariations))); |
| 115 | |
| 116 | ErrorExit: |
| 117 | LxtUninitialize(); |
| 118 | return !LXT_SUCCESS(Result); |
| 119 | } |
| 120 | |
| 121 | void NamespaceSetNsChild(int NsFd) |
| 122 | |
| 123 | /*++ |
| 124 | --*/ |
| 125 | |
| 126 | { |
| 127 | |
| 128 | struct __user_cap_data_struct CapData[2]; |
| 129 | struct __user_cap_header_struct CapHeader; |
| 130 | int Result; |
| 131 | |
| 132 | // |
| 133 | // Drop the CAP_SYS_ADMIN capability. |
| 134 | // |
| 135 | |
| 136 | memset(&CapData, 0, sizeof(CapData)); |
| 137 | memset(&CapHeader, 0, sizeof(CapHeader)); |
| 138 | CapHeader.version = _LINUX_CAPABILITY_VERSION_3; |
| 139 | LxtCheckErrno(LxtCapGet(&CapHeader, CapData)) CapData[CAP_TO_INDEX(CAP_SYS_ADMIN)].effective &= ~CAP_TO_MASK(CAP_SYS_ADMIN); |
| 140 | LxtCheckErrno(LxtCapSet(&CapHeader, CapData)); |
| 141 | |
| 142 | // |
| 143 | // Try to setns without CAP_SYS_ADMIN. |
| 144 | // |
| 145 | |
| 146 | LxtCheckErrnoFailure(setns(NsFd, 0), EPERM); |
| 147 | |
| 148 | ErrorExit: |
| 149 | _exit(Result); |
| 150 | } |
| 151 | |
| 152 | int NamespaceSetNs(PLXT_ARGS Args) |
| 153 | |
| 154 | /*++ |
| 155 | --*/ |
| 156 | |
| 157 | { |
| 158 | |
| 159 | char Buffer[32]; |
| 160 | pid_t ChildPid; |
| 161 | int Index; |
| 162 | int NsFd; |
| 163 | int Result; |
| 164 | |
| 165 | NsFd = -1; |
| 166 | |
| 167 | // |
| 168 | // Pass invalid parameters to setns |
| 169 | // |
| 170 | |
| 171 | LxtCheckErrnoFailure(setns(0, CLONE_NEWPID), EINVAL); |
| 172 | LxtCheckErrnoFailure(setns(0, -1), EINVAL); |
| 173 | LxtCheckErrnoFailure(setns(-1, 0), EBADF); |
| 174 | |
| 175 | // |
| 176 | // Pass the self fds to sets. |
| 177 | // |
| 178 | |
| 179 | for (Index = 0; Index < LXT_COUNT_OF(g_LxtNamespaces); ++Index) |
| 180 | { |
| 181 | snprintf(Buffer, sizeof(Buffer), "/proc/self/ns/%s", g_LxtNamespaces[Index].Name); |
| 182 | printf("%s\n", Buffer); |
| 183 | LxtCheckErrno(NsFd = open(Buffer, O_RDONLY)); |
| 184 | if (g_LxtNamespaces[Index].NsType != CLONE_NEWUSER) |
| 185 | { |
| 186 | LxtCheckErrno(setns(NsFd, 0)); |
| 187 | LxtCheckErrno(setns(NsFd, g_LxtNamespaces[Index].NsType)); |
| 188 | LxtCheckErrno(ChildPid = fork()); |
| 189 | if (ChildPid == 0) |
| 190 | { |
| 191 | NamespaceSetNsChild(NsFd); |
| 192 | } |
| 193 | |
| 194 | LxtWaitPidPoll(ChildPid, 0); |
| 195 | } |
| 196 | else |
| 197 | { |
| 198 | LxtCheckErrnoFailure(setns(NsFd, 0), EINVAL); |
| 199 | LxtCheckErrnoFailure(setns(NsFd, g_LxtNamespaces[Index].NsType), EINVAL); |
| 200 | } |
| 201 | |
| 202 | LxtCheckErrnoFailure(setns(NsFd, g_LxtNamespaces[(Index + 1) % LXT_COUNT_OF(g_LxtNamespaces)].NsType), EINVAL); |
| 203 | LxtCheckErrnoFailure(setns(NsFd, -1), EINVAL); |
| 204 | LxtClose(NsFd); |
| 205 | NsFd = -1; |
| 206 | } |
| 207 | |
| 208 | ErrorExit: |
| 209 | if (NsFd != -1) |
| 210 | { |
| 211 | LxtClose(NsFd); |
| 212 | } |
| 213 | |
| 214 | return Result; |
| 215 | } |
| 216 | |
| 217 | int NamespaceStat(PLXT_ARGS Args) |
| 218 | |
| 219 | { |
| 220 | |
| 221 | char Buffer[32]; |
| 222 | int Index; |
| 223 | int NsFd; |
| 224 | int Result; |
| 225 | struct stat StatData; |
| 226 | |
| 227 | NsFd = -1; |
| 228 | |
| 229 | // |
| 230 | // stat each namespace file and check the result. |
| 231 | // |
| 232 | |
| 233 | for (Index = 0; Index < LXT_COUNT_OF(g_LxtNamespaces); ++Index) |
| 234 | { |
| 235 | snprintf(Buffer, sizeof(Buffer), "/proc/self/ns/%s", g_LxtNamespaces[Index].Name); |
| 236 | printf("%s\n", Buffer); |
| 237 | LxtCheckErrno(NsFd = open(Buffer, O_RDONLY)); |
| 238 | LxtCheckErrno(fstat(NsFd, &StatData)); |
| 239 | |
| 240 | // |
| 241 | // TODO: st_dev is reported as 0 for files. |
| 242 | // |
| 243 | |
| 244 | LxtCheckEqual(major(StatData.st_dev), 0, "%d"); |
| 245 | LxtCheckNotEqual(StatData.st_ino, 0, "%d"); |
| 246 | LxtCheckNotEqual(StatData.st_mode, 0, "%d"); |
| 247 | LxtCheckEqual(StatData.st_nlink, 1, "%d"); |
| 248 | LxtCheckEqual(StatData.st_uid, 0, "%d"); |
| 249 | LxtCheckEqual(StatData.st_gid, 0, "%d"); |
| 250 | LxtCheckEqual(StatData.st_rdev, 0, "%d"); |
| 251 | LxtCheckEqual(StatData.st_size, 0, "%d"); |
| 252 | LxtCheckEqual(StatData.st_blksize, 4096, "%d"); |
| 253 | LxtCheckEqual(StatData.st_blocks, 0, "%d"); |
| 254 | LxtClose(NsFd); |
| 255 | NsFd = -1; |
| 256 | } |
| 257 | |
| 258 | Result = 0; |
| 259 | |
| 260 | ErrorExit: |
| 261 | if (NsFd != -1) |
| 262 | { |
| 263 | LxtClose(NsFd); |
| 264 | } |
| 265 | |
| 266 | return Result; |
| 267 | } |
| 268 | |
| 269 | int VerifyUtsData(struct utsname* ExpectedValues) |
| 270 | |
| 271 | { |
| 272 | |
| 273 | struct utsname ActualValues; |
| 274 | int Fd; |
| 275 | int Length; |
| 276 | char ProcfsDomain[HOST_NAME_MAX]; |
| 277 | char ProcfsHost[HOST_NAME_MAX]; |
| 278 | int Result; |
| 279 | |
| 280 | memset(&ActualValues, 0, sizeof(ActualValues)); |
| 281 | LxtCheckErrno(uname(&ActualValues)); |
| 282 | LxtCheckMemoryEqual(ExpectedValues, &ActualValues, sizeof(ActualValues)); |
| 283 | LxtCheckErrno(Fd = open("/proc/sys/kernel/hostname", O_RDONLY)); |
| 284 | LxtCheckErrno(Length = read(Fd, ProcfsHost, sizeof(ProcfsHost))); |
| 285 | ProcfsHost[Length - 1] = 0; |
| 286 | LxtClose(Fd); |
| 287 | Fd = -1; |
| 288 | LxtCheckStringEqual(ExpectedValues->nodename, ProcfsHost); |
| 289 | LxtCheckErrno(Fd = open("/proc/sys/kernel/domainname", O_RDONLY)); |
| 290 | LxtCheckErrno(Length = read(Fd, ProcfsDomain, sizeof(ProcfsDomain))); |
| 291 | ProcfsDomain[Length - 1] = 0; |
| 292 | LxtClose(Fd); |
| 293 | Fd = -1; |
| 294 | LxtCheckStringEqual(ExpectedValues->domainname, ProcfsDomain); |
| 295 | Result = 0; |
| 296 | |
| 297 | ErrorExit: |
| 298 | if (Fd != -1) |
| 299 | { |
| 300 | LxtClose(Fd); |
| 301 | } |
| 302 | |
| 303 | return Result; |
| 304 | } |
| 305 | |
| 306 | #define CHILD_HOST "childmachine" |
| 307 | #define CHILD_DOMAIN "childdomain" |
| 308 | |
| 309 | int NamespaceUtsChild(struct utsname* ParentValues) |
| 310 | |
| 311 | { |
| 312 | |
| 313 | int Fd; |
| 314 | char Path[64]; |
| 315 | pid_t Ppid; |
| 316 | int Result; |
| 317 | struct utsname UtsBuffer; |
| 318 | |
| 319 | Fd = -1; |
| 320 | |
| 321 | // |
| 322 | // Check the uts namespace behavior for before\after unshare. |
| 323 | // |
| 324 | |
| 325 | memcpy(&UtsBuffer, ParentValues, sizeof(UtsBuffer)); |
| 326 | LxtCheckResult(VerifyUtsData(&UtsBuffer)); |
| 327 | LxtCheckErrno(unshare(CLONE_NEWUTS)); |
| 328 | LxtCheckResult(VerifyUtsData(&UtsBuffer)); |
| 329 | LxtCheckErrno(sethostname(CHILD_HOST, sizeof(CHILD_HOST))); |
| 330 | LxtCheckErrno(setdomainname(CHILD_DOMAIN, sizeof(CHILD_DOMAIN))); |
| 331 | memset(UtsBuffer.nodename, 0, sizeof(UtsBuffer.nodename)); |
| 332 | memcpy(UtsBuffer.nodename, CHILD_HOST, sizeof(CHILD_HOST)); |
| 333 | memset(UtsBuffer.domainname, 0, sizeof(UtsBuffer.domainname)); |
| 334 | memcpy(UtsBuffer.domainname, CHILD_DOMAIN, sizeof(CHILD_DOMAIN)); |
| 335 | LxtCheckResult(VerifyUtsData(&UtsBuffer)); |
| 336 | |
| 337 | // |
| 338 | // Check the uts namespace behavior after switching back to the parent |
| 339 | // uts namespace. |
| 340 | // |
| 341 | |
| 342 | Ppid = getppid(); |
| 343 | sprintf(Path, "/proc/%d/ns/uts", Ppid); |
| 344 | LxtCheckErrno(Fd = open(Path, O_RDONLY)); |
| 345 | LxtCheckErrno(setns(Fd, CLONE_NEWUTS)); |
| 346 | memcpy(&UtsBuffer, ParentValues, sizeof(UtsBuffer)); |
| 347 | LxtCheckResult(VerifyUtsData(&UtsBuffer)); |
| 348 | |
| 349 | Result = 0; |
| 350 | |
| 351 | ErrorExit: |
| 352 | if (Fd != -1) |
| 353 | { |
| 354 | LxtClose(Fd); |
| 355 | } |
| 356 | |
| 357 | return Result; |
| 358 | } |
| 359 | |
| 360 | void NamespaceUtsFork(struct utsname* ParentValues) |
| 361 | |
| 362 | { |
| 363 | |
| 364 | int Result; |
| 365 | |
| 366 | Result = NamespaceUtsChild(ParentValues); |
| 367 | _exit(Result); |
| 368 | } |
| 369 | |
| 370 | void* NamespaceUtsThread(void* Args) |
| 371 | |
| 372 | { |
| 373 | |
| 374 | struct utsname* ParentValues; |
| 375 | int Result; |
| 376 | |
| 377 | ParentValues = Args; |
| 378 | Result = NamespaceUtsChild(Args); |
| 379 | pthread_exit(&Result); |
| 380 | } |
| 381 | |
| 382 | int NamespaceUts(PLXT_ARGS Args) |
| 383 | |
| 384 | { |
| 385 | |
| 386 | pid_t ChildPid; |
| 387 | char* Name; |
| 388 | char NameBuffer[HOST_NAME_MAX]; |
| 389 | int Result; |
| 390 | pthread_t ThreadId = {0}; |
| 391 | struct utsname UtsBuffer; |
| 392 | |
| 393 | // |
| 394 | // Check the UTS behavior for fork() |
| 395 | // |
| 396 | |
| 397 | memset(&UtsBuffer, 0, sizeof(UtsBuffer)); |
| 398 | LxtCheckErrno(uname(&UtsBuffer)); |
| 399 | LxtCheckResult(VerifyUtsData(&UtsBuffer)); |
| 400 | LxtCheckErrno(ChildPid = fork()); |
| 401 | if (ChildPid == 0) |
| 402 | { |
| 403 | NamespaceUtsFork(&UtsBuffer); |
| 404 | } |
| 405 | |
| 406 | LxtWaitPidPoll(ChildPid, 0); |
| 407 | LxtCheckResult(VerifyUtsData(&UtsBuffer)); |
| 408 | |
| 409 | // |
| 410 | // Check the UTS behavior for a pthread. |
| 411 | // |
| 412 | |
| 413 | LxtCheckErrnoZeroSuccess(pthread_create(&ThreadId, NULL, NamespaceUtsThread, &UtsBuffer)); |
| 414 | |
| 415 | pthread_join(ThreadId, NULL); |
| 416 | LxtCheckResult(VerifyUtsData(&UtsBuffer)); |
| 417 | |
| 418 | // |
| 419 | // Test behavior for NULL names. |
| 420 | // |
| 421 | |
| 422 | Name = NULL; |
| 423 | LxtCheckErrno(sethostname(Name, 0)); |
| 424 | LxtCheckErrno(setdomainname(Name, 0)); |
| 425 | memset(NameBuffer, 1, sizeof(NameBuffer)); |
| 426 | LxtCheckErrno(gethostname(NameBuffer, sizeof(NameBuffer))); |
| 427 | LxtCheckEqual(NameBuffer[0], 0, "%c"); |
| 428 | memset(NameBuffer, 1, sizeof(NameBuffer)); |
| 429 | LxtCheckErrno(getdomainname(NameBuffer, sizeof(NameBuffer))); |
| 430 | LxtCheckEqual(NameBuffer[0], 0, "%c"); |
| 431 | |
| 432 | Result = 0; |
| 433 | |
| 434 | ErrorExit: |
| 435 | return Result; |
| 436 | } |
| 437 | |
| 438 | int NamespacePidCheckProcPidStatStatusFiles(char* Dir) |
| 439 | |
| 440 | { |
| 441 | |
| 442 | char Command[80]; |
| 443 | int Gid; |
| 444 | int IntValue; |
| 445 | char Line[40]; |
| 446 | char Name[20]; |
| 447 | int Pid; |
| 448 | int Ppid; |
| 449 | int Result; |
| 450 | char State[10]; |
| 451 | FILE* StatFile; |
| 452 | char StatFileName[30]; |
| 453 | FILE* StatusFile; |
| 454 | char StatusFileName[30]; |
| 455 | int Tid; |
| 456 | int Tgid; |
| 457 | |
| 458 | // |
| 459 | // Check the stat file in ProcFs. |
| 460 | // |
| 461 | |
| 462 | sprintf(StatFileName, "%s/%s", Dir, "/stat"); |
| 463 | StatFile = fopen(StatFileName, "r"); |
| 464 | LxtCheckNotEqual(StatFile, NULL, "%p"); |
| 465 | LxtCheckEqual(fscanf(StatFile, "%d %s %s %d %d", &Tid, Command, State, &Ppid, &Gid), 5, "%d"); |
| 466 | LxtLogInfo("%d %s %s %d %d", Tid, Command, State, Ppid, Gid); |
| 467 | LxtCheckEqual(Tid, 1, "%d"); |
| 468 | LxtCheckEqual(Ppid, 0, "%d"); |
| 469 | LxtCheckEqual(Gid, 0, "%d"); |
| 470 | |
| 471 | // |
| 472 | // Check the status file in ProcFs. |
| 473 | // |
| 474 | |
| 475 | sprintf(StatusFileName, "%s/%s", Dir, "/status"); |
| 476 | StatusFile = fopen(StatusFileName, "r"); |
| 477 | LxtCheckNotEqual(StatusFile, NULL, "%p"); |
| 478 | Tgid = -1; |
| 479 | Pid = -1; |
| 480 | Ppid = -1; |
| 481 | while (fgets(Line, LXT_COUNT_OF(Line), StatusFile) != NULL) |
| 482 | { |
| 483 | if (sscanf(Line, "%s %d", Name, &IntValue) == 2) |
| 484 | { |
| 485 | if (strcmp(Name, "Tgid:") == 0) |
| 486 | { |
| 487 | Tgid = IntValue; |
| 488 | } |
| 489 | else if (strcmp(Name, "Pid:") == 0) |
| 490 | { |
| 491 | Pid = IntValue; |
| 492 | } |
| 493 | else if (strcmp(Name, "PPid:") == 0) |
| 494 | { |
| 495 | Ppid = IntValue; |
| 496 | } |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | LxtCheckEqual(Tgid, 1, "%d"); |
| 501 | LxtCheckEqual(Pid, 1, "%d"); |
| 502 | LxtCheckEqual(Ppid, 0, "%d"); |
| 503 | Result = LXT_RESULT_SUCCESS; |
| 504 | |
| 505 | ErrorExit: |
| 506 | |
| 507 | // |
| 508 | // Intentionally do not close the files. These files are leaked to ensure |
| 509 | // the private procfs instance is cleaned up correctly when there are |
| 510 | // file descriptors that need to be closed during thread group end. |
| 511 | // |
| 512 | |
| 513 | return Result; |
| 514 | } |
| 515 | |
| 516 | void* NamespacePidChildPThread(void* Args) |
| 517 | |
| 518 | { |
| 519 | |
| 520 | int Result; |
| 521 | |
| 522 | LxtLogError("Child pthread ran unexpectedly in new namespace"); |
| 523 | Result = -1; |
| 524 | pthread_exit(&Result); |
| 525 | } |
| 526 | |
| 527 | int NamespacePidGetProcPidFolderCount(char* Dir, int* Count) |
| 528 | |
| 529 | { |
| 530 | |
| 531 | int CountLocal; |
| 532 | struct dirent* DirEnt; |
| 533 | DIR* Fd; |
| 534 | char FullPath[257]; |
| 535 | int Result; |
| 536 | struct stat StatBuffer; |
| 537 | |
| 538 | // |
| 539 | // Get the number of /proc/<pid> folders. |
| 540 | // |
| 541 | |
| 542 | Fd = opendir(Dir); |
| 543 | if (Fd == NULL) |
| 544 | { |
| 545 | LxtLogError("opendir failed, errno: %d (%s)", errno, strerror(errno)); |
| 546 | Result = LXT_RESULT_FAILURE; |
| 547 | goto ErrorExit; |
| 548 | } |
| 549 | |
| 550 | CountLocal = 0; |
| 551 | while ((DirEnt = readdir(Fd)) != NULL) |
| 552 | { |
| 553 | sprintf(FullPath, "%s/%s", Dir, DirEnt->d_name); |
| 554 | LxtLogInfo("Calling stat() on proc folder %s", FullPath); |
| 555 | LxtCheckErrnoZeroSuccess(stat(FullPath, &StatBuffer)); |
| 556 | |
| 557 | // |
| 558 | // Must be a directory, and its name must start with a digit. |
| 559 | // |
| 560 | |
| 561 | if ((StatBuffer.st_mode & S_IFDIR) != S_IFDIR) |
| 562 | { |
| 563 | continue; |
| 564 | } |
| 565 | |
| 566 | if (isdigit(DirEnt->d_name[0]) == FALSE) |
| 567 | { |
| 568 | continue; |
| 569 | } |
| 570 | |
| 571 | CountLocal += 1; |
| 572 | } |
| 573 | |
| 574 | Result = LXT_RESULT_SUCCESS; |
| 575 | |
| 576 | ErrorExit: |
| 577 | if (Fd != NULL) |
| 578 | { |
| 579 | closedir(Fd); |
| 580 | } |
| 581 | |
| 582 | *Count = CountLocal; |
| 583 | return Result; |
| 584 | } |
| 585 | |
| 586 | int PidBasicPipesA[2]; |
| 587 | int PidBasicPipesB[2]; |
| 588 | |
| 589 | #define NAMESPACE_PID_BASIC_TOKEN (0x12345678) |
| 590 | |
| 591 | #define PID_BASIC_PARENT_PIPE_READ (PidBasicPipesA[0]) |
| 592 | #define PID_BASIC_PARENT_PIPE_WRITE (PidBasicPipesB[1]) |
| 593 | #define PID_BASIC_CHILD_PIPE_READ (PidBasicPipesB[0]) |
| 594 | #define PID_BASIC_CHILD_PIPE_WRITE (PidBasicPipesA[1]) |
| 595 | |
| 596 | int NamespacePidBasic(int Level) |
| 597 | |
| 598 | { |
| 599 | |
| 600 | pid_t ChildId; |
| 601 | LXT_CLONE_ARGS CloneArgs; |
| 602 | pid_t CurrentId; |
| 603 | int Result; |
| 604 | int Size; |
| 605 | int Token; |
| 606 | |
| 607 | // |
| 608 | // Create a set of pipes to synchronize with the child PID namespaces. |
| 609 | // |
| 610 | |
| 611 | LxtCheckErrnoZeroSuccess(pipe(PidBasicPipesA)); |
| 612 | LxtCheckErrnoZeroSuccess(pipe(PidBasicPipesB)); |
| 613 | |
| 614 | // |
| 615 | // Clone a child into a new PID namespace. |
| 616 | // |
| 617 | |
| 618 | LxtCheckResult(LxtClone(NamespacePidBasicChild, &Level, CLONE_NEWPID | SIGCHLD, &CloneArgs)); |
| 619 | |
| 620 | // |
| 621 | // Close the child pipes. |
| 622 | // |
| 623 | |
| 624 | LxtCheckErrnoZeroSuccess(close(PID_BASIC_CHILD_PIPE_READ)); |
| 625 | PID_BASIC_CHILD_PIPE_READ = -1; |
| 626 | LxtCheckErrnoZeroSuccess(close(PID_BASIC_CHILD_PIPE_WRITE)); |
| 627 | PID_BASIC_CHILD_PIPE_WRITE = -1; |
| 628 | |
| 629 | // |
| 630 | // Wait for the entire hierarchy to be created. |
| 631 | // |
| 632 | |
| 633 | LxtCheckErrno(Size = read(PID_BASIC_PARENT_PIPE_READ, &Token, sizeof(Token))); |
| 634 | |
| 635 | LxtCheckEqual(Size, sizeof(Token), "%d"); |
| 636 | LxtCheckEqual(Token, NAMESPACE_PID_BASIC_TOKEN, "%x"); |
| 637 | |
| 638 | // |
| 639 | // Validate the PGID of the child. |
| 640 | // |
| 641 | |
| 642 | LxtCheckErrno(CurrentId = getpgid(0)); |
| 643 | LxtCheckErrno(ChildId = getpgid(CloneArgs.CloneId)); |
| 644 | LxtCheckEqual(CurrentId, ChildId, "%d"); |
| 645 | |
| 646 | // |
| 647 | // Validate the SID of the child. |
| 648 | // |
| 649 | |
| 650 | LxtCheckErrno(CurrentId = getsid(0)); |
| 651 | LxtCheckErrno(ChildId = getsid(CloneArgs.CloneId)); |
| 652 | LxtCheckEqual(CurrentId, ChildId, "%d"); |
| 653 | |
| 654 | // |
| 655 | // Notify the hierarchy to exit and wait. |
| 656 | // |
| 657 | |
| 658 | LxtCheckErrno(Size = write(PID_BASIC_PARENT_PIPE_WRITE, &Token, sizeof(Token))); |
| 659 | |
| 660 | LxtCheckEqual(Size, sizeof(Token), "%d"); |
| 661 | LxtCheckResult(LxtWaitPidPoll(CloneArgs.CloneId, 0)); |
| 662 | Result = 0; |
| 663 | |
| 664 | ErrorExit: |
| 665 | return Result; |
| 666 | } |
| 667 | |
| 668 | int NamespacePidBasicChild(void* Param) |
| 669 | |
| 670 | { |
| 671 | |
| 672 | pid_t ChildPid; |
| 673 | LXT_CLONE_ARGS CloneArgs; |
| 674 | int Level; |
| 675 | pid_t Pgid; |
| 676 | pid_t Pid; |
| 677 | int PidFolderCount; |
| 678 | pid_t Ppid; |
| 679 | int Result; |
| 680 | pid_t Sid; |
| 681 | int Size; |
| 682 | pid_t Tid; |
| 683 | int Token; |
| 684 | |
| 685 | Level = *((int*)Param); |
| 686 | |
| 687 | // |
| 688 | // Close the parent pipes. |
| 689 | // |
| 690 | |
| 691 | if (Level == 0) |
| 692 | { |
| 693 | LxtCheckErrnoZeroSuccess(close(PID_BASIC_PARENT_PIPE_READ)); |
| 694 | PID_BASIC_PARENT_PIPE_READ = -1; |
| 695 | LxtCheckErrnoZeroSuccess(close(PID_BASIC_PARENT_PIPE_WRITE)); |
| 696 | PID_BASIC_PARENT_PIPE_WRITE = -1; |
| 697 | } |
| 698 | |
| 699 | usleep(1000 * 80); |
| 700 | |
| 701 | // |
| 702 | // Validate that the first thread/threadgroup in a PID namespace has PID 1. |
| 703 | // |
| 704 | |
| 705 | LxtCheckErrno(Tid = gettid()); |
| 706 | LxtCheckEqual(Tid, 1, "%d"); |
| 707 | LxtCheckErrno(Pid = getpid()); |
| 708 | LxtCheckEqual(Pid, 1, "%d"); |
| 709 | |
| 710 | // |
| 711 | // Validate that the first thread in a PID namespace cannot see its current |
| 712 | // process group, session or parent. |
| 713 | // |
| 714 | |
| 715 | LxtCheckErrno(Pgid = getpgid(0)); |
| 716 | LxtCheckEqual(Pgid, 0, "%d"); |
| 717 | LxtCheckErrno(Sid = getsid(0)); |
| 718 | LxtCheckEqual(Sid, 0, "%d"); |
| 719 | LxtCheckErrno(Ppid = getppid()); |
| 720 | LxtCheckEqual(Ppid, 0, "%d"); |
| 721 | |
| 722 | // |
| 723 | // Run the following in its own mount namespace and mark all mounts in the |
| 724 | // new namespace private so changes cannot propagate to the rest of the |
| 725 | // system. |
| 726 | // |
| 727 | |
| 728 | LxtCheckErrno(unshare(CLONE_NEWNS)); |
| 729 | LxtCheckErrnoZeroSuccess(mount(NULL, "/", NULL, MS_PRIVATE | MS_REC, NULL)); |
| 730 | |
| 731 | // |
| 732 | // Re-mount /proc. This version of /proc should not contain any PIDs from |
| 733 | // the parent PID namespace. |
| 734 | // |
| 735 | |
| 736 | LxtCheckErrnoZeroSuccess(mount(NULL, "/proc", "proc", 0, NULL)); |
| 737 | |
| 738 | // |
| 739 | // Do some basic validation. |
| 740 | // |
| 741 | |
| 742 | LxtCheckErrnoZeroSuccess(access("/proc", R_OK)); |
| 743 | LxtCheckErrnoZeroSuccess(access("/proc/1", R_OK)); |
| 744 | LxtCheckErrnoZeroSuccess(access("/proc/1/cmdline", R_OK)); |
| 745 | LxtCheckErrnoZeroSuccess(access("/proc/self", R_OK)); |
| 746 | LxtCheckErrnoZeroSuccess(access("/proc/self/cmdline", R_OK)); |
| 747 | LxtCheckErrnoFailure(access("/proc/0", R_OK), ENOENT); |
| 748 | LxtCheckErrnoFailure(access("/proc/1234567890", R_OK), ENOENT); |
| 749 | |
| 750 | // |
| 751 | // Check that there is only 1 /proc/<pid> folder. |
| 752 | // |
| 753 | |
| 754 | LxtLogInfo("Checking /proc/<pid> folders, before clone, nested level %d", Level); |
| 755 | LxtCheckResult(NamespacePidGetProcPidFolderCount("/proc", &PidFolderCount)); |
| 756 | LxtCheckEqual(PidFolderCount, 1, "%d"); |
| 757 | |
| 758 | // |
| 759 | // Check the /proc/1/stat, /proc/1/status, /proc/1/task/1/stat |
| 760 | // and /proc/1/task/1/status files. |
| 761 | // |
| 762 | |
| 763 | NamespacePidCheckProcPidStatStatusFiles("/proc/1/"); |
| 764 | NamespacePidCheckProcPidStatStatusFiles("/proc/1/task/1"); |
| 765 | |
| 766 | // |
| 767 | // Test nested PID namespaces. |
| 768 | // |
| 769 | |
| 770 | if (Level < 3) |
| 771 | { |
| 772 | Level += 1; |
| 773 | LxtCheckResult(LxtClone(NamespacePidBasicChild, &Level, CLONE_NEWPID | SIGCHLD, &CloneArgs)); |
| 774 | |
| 775 | // |
| 776 | // After the clone, check that there are now at least 2 /proc/<pid> |
| 777 | // folders. |
| 778 | // |
| 779 | // N.B. The cloned process will recursively create more cloned PID |
| 780 | // namespaces, causing more PIDs to appear under this /proc mount. |
| 781 | // |
| 782 | |
| 783 | LxtLogInfo("Checking /proc/<pid> folders, after clone, nested level %d", Level); |
| 784 | LxtCheckResult(NamespacePidGetProcPidFolderCount("/proc", &PidFolderCount)); |
| 785 | LxtCheckGreaterOrEqual(PidFolderCount, 2, "%d"); |
| 786 | |
| 787 | // |
| 788 | // Check the /proc/1/stat, /proc/1/status, /proc/1/task/1/stat |
| 789 | // and /proc/1/task/1/status files. |
| 790 | // |
| 791 | |
| 792 | NamespacePidCheckProcPidStatStatusFiles("/proc/1/"); |
| 793 | NamespacePidCheckProcPidStatStatusFiles("/proc/1/task/1"); |
| 794 | |
| 795 | // |
| 796 | // Wait for the child to exit. |
| 797 | // |
| 798 | |
| 799 | LxtCheckResult(LxtWaitPidPoll(CloneArgs.CloneId, 0)); |
| 800 | } |
| 801 | else |
| 802 | { |
| 803 | |
| 804 | // |
| 805 | // Signal to the test that the hierarchy is created. |
| 806 | // |
| 807 | |
| 808 | Token = NAMESPACE_PID_BASIC_TOKEN; |
| 809 | LxtCheckErrno(Size = write(PID_BASIC_CHILD_PIPE_WRITE, &Token, sizeof(Token))); |
| 810 | |
| 811 | LxtCheckEqual(Size, sizeof(Token), "%d"); |
| 812 | |
| 813 | // |
| 814 | // Wait for the notification to exit. |
| 815 | // |
| 816 | |
| 817 | LxtCheckErrno(Size = read(PID_BASIC_CHILD_PIPE_READ, &Token, sizeof(Token))); |
| 818 | |
| 819 | LxtCheckEqual(Size, sizeof(Token), "%d"); |
| 820 | LxtCheckEqual(Token, NAMESPACE_PID_BASIC_TOKEN, "%x"); |
| 821 | } |
| 822 | |
| 823 | Result = 0; |
| 824 | |
| 825 | ErrorExit: |
| 826 | return Result; |
| 827 | } |
| 828 | |
| 829 | int NamespacePidParentPThread(void) |
| 830 | |
| 831 | { |
| 832 | |
| 833 | pthread_t ThreadId = {0}; |
| 834 | int Result; |
| 835 | |
| 836 | // |
| 837 | // Create a new child PID namespace and check that pthread creation fails. |
| 838 | // |
| 839 | |
| 840 | LxtCheckErrno(unshare(CLONE_NEWPID)); |
| 841 | LxtCheckEqual(pthread_create(&ThreadId, NULL, NamespacePidChildPThread, NULL), EINVAL, "%d"); |
| 842 | |
| 843 | Result = 0; |
| 844 | |
| 845 | ErrorExit: |
| 846 | return Result; |
| 847 | } |
| 848 | |
| 849 | int NamespacePidTerminate(int Level, int* Ready) |
| 850 | |
| 851 | { |
| 852 | |
| 853 | pid_t ChildPid; |
| 854 | int Index; |
| 855 | int Result; |
| 856 | |
| 857 | LxtLogInfo("[%d/%d] PID namespace leader", Level, getpid()); |
| 858 | |
| 859 | // |
| 860 | // Create 10 child threadgroups that loop sleeping. |
| 861 | // |
| 862 | |
| 863 | for (Index = 0; Index < 10; Index += 1) |
| 864 | { |
| 865 | LxtCheckErrno(ChildPid = fork()); |
| 866 | if (ChildPid == 0) |
| 867 | { |
| 868 | for (;;) |
| 869 | { |
| 870 | sleep(-1); |
| 871 | } |
| 872 | } |
| 873 | |
| 874 | LxtLogInfo("[%d/%d] PID namespace sleeper %d", Level, getpid(), ChildPid); |
| 875 | } |
| 876 | |
| 877 | // |
| 878 | // Create 3 levels of nested PID namespaces and then signal the ready futex. |
| 879 | // |
| 880 | |
| 881 | if (Level < 3) |
| 882 | { |
| 883 | LxtCheckErrno(ChildPid = fork()); |
| 884 | if (ChildPid == 0) |
| 885 | { |
| 886 | LxtLogInfo("[%d/%d] PID namespace trampoline", Level, getpid()); |
| 887 | LxtCheckErrno(unshare(CLONE_NEWPID)); |
| 888 | LxtCheckErrno(ChildPid = fork()); |
| 889 | if (ChildPid == 0) |
| 890 | { |
| 891 | _exit(NamespacePidTerminate(Level + 1, Ready)); |
| 892 | } |
| 893 | |
| 894 | _exit(0); |
| 895 | } |
| 896 | } |
| 897 | else |
| 898 | { |
| 899 | LxtLogInfo("[%d/%d] Signaling ready futex...", Level, getpid()); |
| 900 | *Ready = 1; |
| 901 | LxtCheckErrno(LxtFutex(Ready, FUTEX_WAKE, 1, NULL, NULL, 0)); |
| 902 | } |
| 903 | |
| 904 | // |
| 905 | // Sleep. |
| 906 | // |
| 907 | |
| 908 | for (;;) |
| 909 | { |
| 910 | sleep(-1); |
| 911 | } |
| 912 | |
| 913 | Result = 0; |
| 914 | |
| 915 | ErrorExit: |
| 916 | return Result; |
| 917 | } |
| 918 | |
| 919 | int NamespacePidTestTerminate() |
| 920 | |
| 921 | { |
| 922 | |
| 923 | pid_t ChildPid; |
| 924 | void* MapResult; |
| 925 | int* Ready; |
| 926 | int Result; |
| 927 | struct timespec Time; |
| 928 | int WaitStatus; |
| 929 | |
| 930 | // |
| 931 | // Create the ready futex. |
| 932 | // |
| 933 | |
| 934 | LxtCheckMapErrno(Ready = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0)); |
| 935 | *Ready = 0; |
| 936 | |
| 937 | // |
| 938 | // Create the top-level PID namespace. |
| 939 | // |
| 940 | |
| 941 | LxtCheckErrno(unshare(CLONE_NEWPID)); |
| 942 | LxtCheckErrno(ChildPid = fork()); |
| 943 | if (ChildPid == 0) |
| 944 | { |
| 945 | _exit(NamespacePidTerminate(0, Ready)); |
| 946 | } |
| 947 | |
| 948 | // |
| 949 | // Wait for the ready futex. |
| 950 | // |
| 951 | |
| 952 | Time.tv_sec = 10; |
| 953 | Time.tv_nsec = 0; |
| 954 | LxtLogInfo("[%d] Waiting for all child threadgroups and namespaces to be created...", getpid()); |
| 955 | while (*Ready == 0) |
| 956 | { |
| 957 | Result = LxtFutex(Ready, FUTEX_WAIT, 0, &Time, NULL, 0); |
| 958 | if ((Result == -1) && (errno != EAGAIN) && (errno != EINTR)) |
| 959 | { |
| 960 | LxtCheckErrno(Result); |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | // |
| 965 | // Terminate the top-level PID namespace and wait on the leader. |
| 966 | // |
| 967 | |
| 968 | LxtCheckErrnoZeroSuccess(kill(ChildPid, SIGKILL)); |
| 969 | LxtWaitPidPoll(ChildPid, SIGKILL); |
| 970 | |
| 971 | // |
| 972 | // Sleep and make sure that there are no other waits pending. |
| 973 | // |
| 974 | |
| 975 | sleep(1); |
| 976 | LxtCheckErrnoFailure(waitpid(-1, &WaitStatus, WNOHANG), ECHILD); |
| 977 | Result = 0; |
| 978 | |
| 979 | ErrorExit: |
| 980 | return Result; |
| 981 | } |
| 982 | |
| 983 | int NamespacePidTestReboot() |
| 984 | |
| 985 | { |
| 986 | |
| 987 | pid_t ChildPid; |
| 988 | pid_t Pid; |
| 989 | int* Ready; |
| 990 | int Result; |
| 991 | int WaitStatus; |
| 992 | |
| 993 | Pid = getpid(); |
| 994 | |
| 995 | // |
| 996 | // Create a child process of init that calls reboot. |
| 997 | // |
| 998 | // N.B. Init is terminated with SIGINT and the signal handler is not |
| 999 | // invoked. |
| 1000 | // |
| 1001 | |
| 1002 | LxtCheckErrno(unshare(CLONE_NEWPID)); |
| 1003 | LxtCheckErrno(ChildPid = fork()); |
| 1004 | if (ChildPid == 0) |
| 1005 | { |
| 1006 | LxtCheckErrnoFailure(LxtReboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_CAD_ON, NULL), EINVAL); |
| 1007 | LxtCheckErrnoFailure(LxtReboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_CAD_OFF, NULL), EINVAL); |
| 1008 | LxtCheckResult(LxtSignalInitialize()); |
| 1009 | LxtCheckResult(LxtSignalSetupHandler(SIGINT, SA_SIGINFO)); |
| 1010 | LxtLogInfo("Forking..."); |
| 1011 | LxtCheckErrno(ChildPid = fork()); |
| 1012 | if (ChildPid == 0) |
| 1013 | { |
| 1014 | LxtCheckResult(LxtReboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_POWER_OFF, NULL)); |
| 1015 | _exit(0); |
| 1016 | } |
| 1017 | |
| 1018 | LxtLogInfo("Waiting..."); |
| 1019 | LxtSignalWait(); |
| 1020 | LxtCheckResult(LxtWaitPidPoll(ChildPid, 0)); |
| 1021 | _exit(0); |
| 1022 | } |
| 1023 | |
| 1024 | // |
| 1025 | // Wait for the reboot signal. |
| 1026 | // |
| 1027 | |
| 1028 | LxtCheckResult(LxtWaitPidPoll(ChildPid, SIGINT)); |
| 1029 | |
| 1030 | // |
| 1031 | // Sleep and make sure that there are no other waits pending. |
| 1032 | // |
| 1033 | |
| 1034 | sleep(1); |
| 1035 | LxtCheckErrnoFailure(waitpid(-1, &WaitStatus, WNOHANG), ECHILD); |
| 1036 | Result = 0; |
| 1037 | |
| 1038 | ErrorExit: |
| 1039 | if (Pid != getpid()) |
| 1040 | { |
| 1041 | _exit(Result); |
| 1042 | } |
| 1043 | |
| 1044 | return Result; |
| 1045 | } |
| 1046 | |
| 1047 | int NamespacePid(PLXT_ARGS Args) |
| 1048 | |
| 1049 | { |
| 1050 | |
| 1051 | pid_t ChildPid; |
| 1052 | int Result; |
| 1053 | |
| 1054 | // |
| 1055 | // Check basic PID namespace behavior. |
| 1056 | // |
| 1057 | |
| 1058 | LxtCheckErrno(ChildPid = fork()); |
| 1059 | if (ChildPid == 0) |
| 1060 | { |
| 1061 | _exit(NamespacePidBasic(0)); |
| 1062 | } |
| 1063 | |
| 1064 | LxtWaitPidPoll(ChildPid, 0); |
| 1065 | |
| 1066 | // |
| 1067 | // Check the pid namespace behavior for a pthread. |
| 1068 | // |
| 1069 | |
| 1070 | LxtCheckErrno(ChildPid = fork()); |
| 1071 | if (ChildPid == 0) |
| 1072 | { |
| 1073 | _exit(NamespacePidParentPThread()); |
| 1074 | } |
| 1075 | |
| 1076 | LxtWaitPidPoll(ChildPid, 0); |
| 1077 | |
| 1078 | // |
| 1079 | // Check the pid namespace behavior for signals, termination and waits. |
| 1080 | // |
| 1081 | |
| 1082 | LxtCheckErrno(ChildPid = fork()); |
| 1083 | if (ChildPid == 0) |
| 1084 | { |
| 1085 | _exit(NamespacePidTestTerminate()); |
| 1086 | } |
| 1087 | |
| 1088 | LxtWaitPidPoll(ChildPid, 0); |
| 1089 | |
| 1090 | // |
| 1091 | // Check the pid namespace behavior for reboot. |
| 1092 | // |
| 1093 | |
| 1094 | LxtCheckErrno(ChildPid = fork()); |
| 1095 | if (ChildPid == 0) |
| 1096 | { |
| 1097 | _exit(NamespacePidTestReboot()); |
| 1098 | } |
| 1099 | |
| 1100 | LxtWaitPidPoll(ChildPid, 0); |
| 1101 | |
| 1102 | Result = 0; |
| 1103 | |
| 1104 | ErrorExit: |
| 1105 | return Result; |
| 1106 | } |
| 1107 | |
| 1108 | int NamespaceNetworkGetNSID(int* NetworkNamespaceId) |
| 1109 | { |
| 1110 | |
| 1111 | socklen_t AddressLength; |
| 1112 | struct rtattr* Attribute; |
| 1113 | struct sockaddr_nl BindAddress; |
| 1114 | struct nlmsgerr* Error; |
| 1115 | struct nlmsghdr* Header; |
| 1116 | int Index; |
| 1117 | int NetworkNamespaceFd; |
| 1118 | int ReceiveResult; |
| 1119 | int RemainingLength; |
| 1120 | struct |
| 1121 | { |
| 1122 | struct nlmsghdr nlh; |
| 1123 | struct rtgenmsg msg __attribute__((aligned(NLMSG_ALIGNTO))); |
| 1124 | struct |
| 1125 | { |
| 1126 | struct rtattr rta __attribute__((aligned(RTA_ALIGNTO))); |
| 1127 | int val __attribute__((aligned(RTA_ALIGNTO))); |
| 1128 | } data[5]; |
| 1129 | } Request, Response; |
| 1130 | int Result; |
| 1131 | struct rtgenmsg* RtGenMsg; |
| 1132 | int Socket; |
| 1133 | |
| 1134 | // |
| 1135 | // Open network namespace file descriptor. |
| 1136 | // |
| 1137 | |
| 1138 | LxtCheckErrno(NetworkNamespaceFd = open("/proc/self/ns/net", O_RDONLY)); |
| 1139 | |
| 1140 | // |
| 1141 | // Create and bind socket. Create a RTM_GETNSID request. |
| 1142 | // |
| 1143 | |
| 1144 | LxtCheckErrno(Socket = socket(AF_NETLINK, SOCK_RAW, 0)); |
| 1145 | memset(&BindAddress, 0, sizeof(BindAddress)); |
| 1146 | BindAddress.nl_family = AF_NETLINK; |
| 1147 | AddressLength = sizeof(BindAddress); |
| 1148 | LxtCheckErrno(bind(Socket, (struct sockaddr*)&BindAddress, AddressLength)); |
| 1149 | |
| 1150 | memset(&Request, 0, sizeof(Request)); |
| 1151 | Request.nlh.nlmsg_len = NLMSG_SPACE(sizeof(Request.msg)) + RTA_SPACE(sizeof(int)); |
| 1152 | |
| 1153 | Request.nlh.nlmsg_type = RTM_GETNSID; |
| 1154 | Request.nlh.nlmsg_seq = 0x4567; |
| 1155 | Request.msg.rtgen_family = AF_UNSPEC; |
| 1156 | Request.nlh.nlmsg_flags = NLM_F_REQUEST; |
| 1157 | Request.data[0].rta.rta_len = RTA_LENGTH(sizeof(int)); |
| 1158 | Request.data[0].rta.rta_type = NETNSA_FD; |
| 1159 | Request.data[0].val = NetworkNamespaceFd; |
| 1160 | LxtCheckErrno(sendto(Socket, &Request, sizeof(Request), 0, NULL, 0)); |
| 1161 | memset(&Response, 0, sizeof(Response)); |
| 1162 | LxtCheckErrno(ReceiveResult = recvfrom(Socket, &Response, sizeof(Response), 0, NULL, 0)); |
| 1163 | |
| 1164 | LxtCheckTrue(NLMSG_OK(&Response.nlh, ReceiveResult)); |
| 1165 | LxtCheckEqual(Response.nlh.nlmsg_type, RTM_NEWNSID, "%hd"); |
| 1166 | LxtCheckTrue(Response.nlh.nlmsg_len >= NLMSG_LENGTH(sizeof(Response.msg))); |
| 1167 | |
| 1168 | Attribute = &Response.data[0].rta; |
| 1169 | RemainingLength = Response.nlh.nlmsg_len - NLMSG_LENGTH(sizeof(Response.msg)); |
| 1170 | |
| 1171 | LxtCheckTrue(RTA_OK(Attribute, RemainingLength)); |
| 1172 | *NetworkNamespaceId = *(int*)RTA_DATA(Attribute); |
| 1173 | Attribute = RTA_NEXT(Attribute, RemainingLength); |
| 1174 | LxtCheckTrue(RTA_OK(Attribute, RemainingLength) == FALSE); |
| 1175 | LxtCheckTrue(NLMSG_OK(NLMSG_NEXT(&Response.nlh, ReceiveResult), ReceiveResult) == FALSE); |
| 1176 | |
| 1177 | Result = 0; |
| 1178 | |
| 1179 | ErrorExit: |
| 1180 | if (Socket > 0) |
| 1181 | { |
| 1182 | close(Socket); |
| 1183 | } |
| 1184 | |
| 1185 | if (NetworkNamespaceFd > 0) |
| 1186 | { |
| 1187 | close(NetworkNamespaceFd); |
| 1188 | } |
| 1189 | |
| 1190 | return Result; |
| 1191 | } |
| 1192 | |
| 1193 | int NamespaceNetwork(PLXT_ARGS Args) |
| 1194 | |
| 1195 | { |
| 1196 | |
| 1197 | int NetworkNamespaceId; |
| 1198 | int OriginalNetworkNamespaceFd; |
| 1199 | int Result; |
| 1200 | DIR* SysClassNetDirectory; |
| 1201 | |
| 1202 | // |
| 1203 | // Open file descriptor of default network namespace. |
| 1204 | // |
| 1205 | |
| 1206 | LxtCheckErrno(OriginalNetworkNamespaceFd = open("/proc/self/ns/net", 0)); |
| 1207 | |
| 1208 | // |
| 1209 | // Verify default namespace ID is set. |
| 1210 | // |
| 1211 | |
| 1212 | LxtCheckErrno(NamespaceNetworkGetNSID(&NetworkNamespaceId)); |
| 1213 | LxtCheckEqual(NetworkNamespaceId, -1, "%d"); |
| 1214 | |
| 1215 | // |
| 1216 | // Switch to a new network namespace. |
| 1217 | // |
| 1218 | |
| 1219 | LxtCheckErrno(unshare(CLONE_NEWNET)); |
| 1220 | |
| 1221 | // |
| 1222 | // Verify default namespace ID is set. |
| 1223 | // |
| 1224 | |
| 1225 | LxtCheckErrno(NamespaceNetworkGetNSID(&NetworkNamespaceId)); |
| 1226 | LxtCheckEqual(NetworkNamespaceId, -1, "%d"); |
| 1227 | |
| 1228 | // |
| 1229 | // Switch back to original network namespace. |
| 1230 | // |
| 1231 | |
| 1232 | LxtCheckErrno(setns(OriginalNetworkNamespaceFd, CLONE_NEWNET)); |
| 1233 | Result = 0; |
| 1234 | |
| 1235 | ErrorExit: |
| 1236 | if (OriginalNetworkNamespaceFd >= 0) |
| 1237 | { |
| 1238 | LxtClose(OriginalNetworkNamespaceFd); |
| 1239 | } |
| 1240 | |
| 1241 | return Result; |
| 1242 | } |
| 1243 | |
| 1244 | int NamespaceNetworkProcfs(PLXT_ARGS Args) |
| 1245 | |
| 1246 | { |
| 1247 | |
| 1248 | pid_t ChildPid; |
| 1249 | char FileName[50]; |
| 1250 | struct ifreq InterfaceUpRequest; |
| 1251 | int Result; |
| 1252 | int Socket; |
| 1253 | |
| 1254 | // |
| 1255 | // Create a child process and switch it to a new network namespace. |
| 1256 | // From the parent, read the child's /proc/<pid>/net entries and verify |
| 1257 | // that those entries reflect the network state of the child. |
| 1258 | // |
| 1259 | |
| 1260 | LxtCheckErrno(ChildPid = fork()); |
| 1261 | if (ChildPid == 0) |
| 1262 | { |
| 1263 | LxtCheckErrnoZeroSuccess(unshare(CLONE_NEWNET)); |
| 1264 | |
| 1265 | // |
| 1266 | // Bring the loopback up so that it shows up in procfs. (Needed for native |
| 1267 | // Ubuntu only - on WSL the loopback is automatically UP on namespace creation.) |
| 1268 | // |
| 1269 | |
| 1270 | LxtCheckErrno(Socket = socket(AF_UNIX, SOCK_DGRAM, 0)); |
| 1271 | memset(&InterfaceUpRequest, 0, sizeof(InterfaceUpRequest)); |
| 1272 | strncpy(InterfaceUpRequest.ifr_name, SOCKET_LOOPBACK_IF_NAME, sizeof(InterfaceUpRequest.ifr_name) - 1); |
| 1273 | |
| 1274 | usleep(1000 * 100); |
| 1275 | LxtCheckErrnoZeroSuccess(ioctl(Socket, SIOCGIFFLAGS, &InterfaceUpRequest)); |
| 1276 | LxtCheckEqual(InterfaceUpRequest.ifr_flags & IFF_LOOPBACK, IFF_LOOPBACK, "%d"); |
| 1277 | InterfaceUpRequest.ifr_flags |= IFF_UP; |
| 1278 | LxtCheckErrnoZeroSuccess(ioctl(Socket, SIOCSIFFLAGS, &InterfaceUpRequest)); |
| 1279 | close(Socket); |
| 1280 | |
| 1281 | // |
| 1282 | // Keep the child alive so that the parent can examine its /proc/<pid>/net entries. |
| 1283 | // |
| 1284 | |
| 1285 | while (1) |
| 1286 | ; |
| 1287 | exit(0); |
| 1288 | } |
| 1289 | |
| 1290 | // |
| 1291 | // N.B. The sleep is because it can take some time for the lxcore cache to get |
| 1292 | // the new network interface notification. |
| 1293 | // |
| 1294 | |
| 1295 | usleep(1000 * 200); |
| 1296 | |
| 1297 | // |
| 1298 | // Check the /proc/<pid>/net/dev file. This file should have 3 lines |
| 1299 | // (2 lines header and one line for lo). |
| 1300 | // |
| 1301 | |
| 1302 | sprintf(FileName, "/proc/%d/net/dev", ChildPid); |
| 1303 | LxtCheckResult(NamespaceNetworkProcfsCheckFile(FileName, 3)); |
| 1304 | |
| 1305 | // |
| 1306 | // Check the /proc/<pid>/net/if_inet6 file. This file should have 1 line, |
| 1307 | // for lo. |
| 1308 | // |
| 1309 | |
| 1310 | sprintf(FileName, "/proc/%d/net/if_inet6", ChildPid); |
| 1311 | LxtCheckResult(NamespaceNetworkProcfsCheckFile(FileName, 1)); |
| 1312 | |
| 1313 | // |
| 1314 | // Check the /proc/<pid>/net/route file. This file has one line on Ubuntu |
| 1315 | // (1 line header and no routing entries) and multiple lines on WSL. Therefore, |
| 1316 | // don't check the line count for this file. |
| 1317 | // |
| 1318 | |
| 1319 | sprintf(FileName, "/proc/%d/net/route", ChildPid); |
| 1320 | LxtCheckResult(NamespaceNetworkProcfsCheckFile(FileName, -1)); |
| 1321 | |
| 1322 | // |
| 1323 | // All done, the child should die now. |
| 1324 | // |
| 1325 | |
| 1326 | kill(ChildPid, SIGKILL); |
| 1327 | LxtCheckResult(LxtWaitPidPoll(ChildPid, SIGKILL)); |
| 1328 | Result = LXT_RESULT_SUCCESS; |
| 1329 | |
| 1330 | ErrorExit: |
| 1331 | return Result; |
| 1332 | } |
| 1333 | |
| 1334 | int NamespaceNetworkProcfsCheckFile(char* FileName, int ExpectedLineCount) |
| 1335 | |
| 1336 | { |
| 1337 | |
| 1338 | char Buffer[200]; |
| 1339 | FILE* File; |
| 1340 | int LineCount; |
| 1341 | int Result; |
| 1342 | |
| 1343 | // |
| 1344 | // Open the file up and check how many lines it has. |
| 1345 | // |
| 1346 | |
| 1347 | LineCount = 0; |
| 1348 | File = fopen(FileName, "r"); |
| 1349 | LxtCheckTrue(File != NULL); |
| 1350 | while (fgets(Buffer, LXT_COUNT_OF(Buffer), File) != NULL) |
| 1351 | { |
| 1352 | LineCount += 1; |
| 1353 | |
| 1354 | // |
| 1355 | // The following strings should not be seen, since the only network |
| 1356 | // interface in the file should be lo. |
| 1357 | // |
| 1358 | |
| 1359 | LxtCheckTrue(strstr(Buffer, "eth") == NULL); |
| 1360 | LxtCheckTrue(strstr(Buffer, "wlan") == NULL); |
| 1361 | LxtCheckTrue(strstr(Buffer, "wifi") == NULL); |
| 1362 | LxtCheckTrue(strstr(Buffer, "und") == NULL); |
| 1363 | } |
| 1364 | |
| 1365 | if (ExpectedLineCount != -1) |
| 1366 | { |
| 1367 | LxtCheckEqual(LineCount, ExpectedLineCount, "%d"); |
| 1368 | } |
| 1369 | |
| 1370 | Result = LXT_RESULT_SUCCESS; |
| 1371 | |
| 1372 | ErrorExit: |
| 1373 | if (File != NULL) |
| 1374 | { |
| 1375 | fclose(File); |
| 1376 | } |
| 1377 | |
| 1378 | return Result; |
| 1379 | } |
| 1380 | |
| 1381 | typedef struct _LXT_NAMESPACE_IPC_DATA |
| 1382 | { |
| 1383 | int Id; |
| 1384 | void* Address; |
| 1385 | } LXT_NAMESPACE_IPC_DATA, *PLXT_NAMESPACE_IPC_DATA; |
| 1386 | |
| 1387 | int NamespaceIpcChild(PLXT_NAMESPACE_IPC_DATA Data) |
| 1388 | |
| 1389 | { |
| 1390 | |
| 1391 | int Fd; |
| 1392 | char Path[64]; |
| 1393 | pid_t Ppid; |
| 1394 | int Result; |
| 1395 | struct shmid_ds Stat; |
| 1396 | |
| 1397 | Fd = -1; |
| 1398 | |
| 1399 | // |
| 1400 | // Check the ipc namespace behavior for before\after unshare. |
| 1401 | // |
| 1402 | |
| 1403 | LxtCheckErrno(LxtShmCtl(Data->Id, IPC_STAT, &Stat)); |
| 1404 | LxtCheckErrno(unshare(CLONE_NEWIPC)); |
| 1405 | LxtCheckErrnoFailure(LxtShmCtl(Data->Id, IPC_STAT, &Stat), EINVAL); |
| 1406 | |
| 1407 | // |
| 1408 | // shmdt should still succeed in the new namespace. |
| 1409 | // |
| 1410 | |
| 1411 | LxtCheckErrno(LxtShmDt(Data->Address)); |
| 1412 | // |
| 1413 | // Check the ipc namespace behavior after switching back to the parent |
| 1414 | // ipc namespace. |
| 1415 | // |
| 1416 | |
| 1417 | Ppid = getppid(); |
| 1418 | sprintf(Path, "/proc/%d/ns/ipc", Ppid); |
| 1419 | LxtCheckErrno(Fd = open(Path, O_RDONLY)); |
| 1420 | LxtCheckErrno(setns(Fd, CLONE_NEWIPC)); |
| 1421 | LxtCheckErrno(LxtShmCtl(Data->Id, IPC_STAT, &Stat)); |
| 1422 | |
| 1423 | Result = 0; |
| 1424 | |
| 1425 | ErrorExit: |
| 1426 | if (Fd != -1) |
| 1427 | { |
| 1428 | LxtClose(Fd); |
| 1429 | } |
| 1430 | |
| 1431 | return Result; |
| 1432 | } |
| 1433 | |
| 1434 | void NamespaceIpcFork(PLXT_NAMESPACE_IPC_DATA Data) |
| 1435 | |
| 1436 | { |
| 1437 | |
| 1438 | int Result; |
| 1439 | |
| 1440 | Result = NamespaceIpcChild(Data); |
| 1441 | _exit(Result); |
| 1442 | } |
| 1443 | |
| 1444 | void* NamespaceIpcThread(void* Args) |
| 1445 | |
| 1446 | { |
| 1447 | |
| 1448 | PLXT_NAMESPACE_IPC_DATA Data; |
| 1449 | int Result; |
| 1450 | |
| 1451 | Data = Args; |
| 1452 | Result = NamespaceIpcChild(Data); |
| 1453 | pthread_exit(&Result); |
| 1454 | } |
| 1455 | |
| 1456 | int NamespaceIpc(PLXT_ARGS Args) |
| 1457 | |
| 1458 | { |
| 1459 | |
| 1460 | int ChildPid; |
| 1461 | LXT_NAMESPACE_IPC_DATA Data; |
| 1462 | void* MapResult; |
| 1463 | int Result; |
| 1464 | struct shmid_ds Stat; |
| 1465 | pthread_t ThreadId = {0}; |
| 1466 | |
| 1467 | Data.Id = -1; |
| 1468 | Data.Address = NULL; |
| 1469 | |
| 1470 | // |
| 1471 | // Check the IPC behavior for fork() |
| 1472 | // |
| 1473 | |
| 1474 | LxtCheckErrno(Data.Id = LxtShmGet(IPC_PRIVATE, PAGE_SIZE, 0)); |
| 1475 | LxtCheckMapErrno(Data.Address = LxtShmAt(Data.Id, NULL, 0)); |
| 1476 | LxtCheckErrno(ChildPid = fork()); |
| 1477 | if (ChildPid == 0) |
| 1478 | { |
| 1479 | NamespaceIpcFork(&Data); |
| 1480 | } |
| 1481 | |
| 1482 | LxtWaitPidPoll(ChildPid, 0); |
| 1483 | LxtCheckErrno(LxtShmCtl(Data.Id, IPC_STAT, &Stat)); |
| 1484 | |
| 1485 | // |
| 1486 | // Verify shmdt succeeds and create a new mapping. |
| 1487 | // |
| 1488 | |
| 1489 | LxtCheckErrno(LxtShmDt(Data.Address)); |
| 1490 | LxtCheckMapErrno(Data.Address = LxtShmAt(Data.Id, NULL, 0)); |
| 1491 | |
| 1492 | // |
| 1493 | // Check the IPC behavior for a pthread. |
| 1494 | // |
| 1495 | |
| 1496 | LxtCheckErrnoZeroSuccess(pthread_create(&ThreadId, NULL, NamespaceIpcThread, &Data)); |
| 1497 | |
| 1498 | pthread_join(ThreadId, NULL); |
| 1499 | LxtCheckErrno(LxtShmCtl(Data.Id, IPC_STAT, &Stat)); |
| 1500 | |
| 1501 | // |
| 1502 | // Verify shmdt fails (was unmapped by the pthread). |
| 1503 | // |
| 1504 | |
| 1505 | LxtCheckErrnoFailure(LxtShmDt(Data.Address), EINVAL); |
| 1506 | Data.Address = NULL; |
| 1507 | |
| 1508 | Result = 0; |
| 1509 | |
| 1510 | ErrorExit: |
| 1511 | if (Data.Id != -1) |
| 1512 | { |
| 1513 | LxtShmCtl(Data.Id, IPC_RMID, NULL); |
| 1514 | } |
| 1515 | |
| 1516 | if (Data.Address != NULL) |
| 1517 | { |
| 1518 | LxtShmDt(Data.Address); |
| 1519 | } |
| 1520 | |
| 1521 | return Result; |
| 1522 | } |
| 1523 | |
| 1524 | int NamespaceCloneInvalidChild(unsigned long Flags, PLXT_PIPE Pipe) |
| 1525 | |
| 1526 | /*++ |
| 1527 | |
| 1528 | Description: |
| 1529 | |
| 1530 | This routine is the child process for WaitPidVariationCloneParent. |
| 1531 | |
| 1532 | Arguments: |
| 1533 | |
| 1534 | None.. |
| 1535 | |
| 1536 | Return Value: |
| 1537 | |
| 1538 | Returns 0 on success, -1 on failure. |
| 1539 | |
| 1540 | --*/ |
| 1541 | |
| 1542 | { |
| 1543 | |
| 1544 | pid_t ChildPid; |
| 1545 | pid_t GrandChildParent; |
| 1546 | pid_t ChildParent; |
| 1547 | int Result; |
| 1548 | int WaitPidStatus; |
| 1549 | |
| 1550 | Result = 0; |
| 1551 | |
| 1552 | // |
| 1553 | // Create a child process with the requested CLONE_PARENT and other flag. |
| 1554 | // |
| 1555 | // The new process should not be reported as a child. |
| 1556 | // |
| 1557 | |
| 1558 | ChildParent = getppid(); |
| 1559 | LxtLogInfo("ChildParent %d", ChildParent); |
| 1560 | LxtCheckResult(ChildPid = LxtCloneSyscall(Flags | SIGCHLD, NULL, NULL, NULL, NULL)); |
| 1561 | if (ChildPid == 0) |
| 1562 | { |
| 1563 | GrandChildParent = getppid(); |
| 1564 | if ((Flags & CLONE_NEWPID) != 0) |
| 1565 | { |
| 1566 | LxtCheckEqual(0, GrandChildParent, "%d"); |
| 1567 | } |
| 1568 | else |
| 1569 | { |
| 1570 | LxtCheckEqual(ChildParent, GrandChildParent, "%d"); |
| 1571 | } |
| 1572 | |
| 1573 | LxtLogInfo("Grand child %d exiting", LxtGetTid()); |
| 1574 | } |
| 1575 | else |
| 1576 | { |
| 1577 | LxtCheckErrnoFailure(waitpid(ChildPid, &WaitPidStatus, 0), ECHILD); |
| 1578 | LxtCheckResult(write(Pipe->Write, &ChildPid, sizeof(ChildPid))); |
| 1579 | LxtLogInfo("Child %d exiting", LxtGetTid()); |
| 1580 | } |
| 1581 | |
| 1582 | Result = 0; |
| 1583 | |
| 1584 | ErrorExit: |
| 1585 | _exit(Result); |
| 1586 | } |
| 1587 | |
| 1588 | int NamespaceCloneInvalid(PLXT_ARGS Args) |
| 1589 | |
| 1590 | /*++ |
| 1591 | --*/ |
| 1592 | |
| 1593 | { |
| 1594 | |
| 1595 | int ChildPid; |
| 1596 | LXT_PIPE Pipe = {-1, -1}; |
| 1597 | int PipeData; |
| 1598 | int Result; |
| 1599 | |
| 1600 | ChildPid = -1; |
| 1601 | LxtCheckResult(LxtCreatePipe(&Pipe)); |
| 1602 | |
| 1603 | // |
| 1604 | // CLONE_NEWPID and CLONE_NEWUSER can't be specified with CLONE_THREAD. |
| 1605 | // |
| 1606 | |
| 1607 | LxtCheckErrnoFailure(ChildPid = LxtCloneSyscall(CLONE_NEWPID | CLONE_THREAD, NULL, NULL, NULL, NULL), EINVAL); |
| 1608 | LxtCheckErrnoFailure(ChildPid = LxtCloneSyscall(CLONE_NEWUSER | CLONE_THREAD, NULL, NULL, NULL, NULL), EINVAL); |
| 1609 | |
| 1610 | // |
| 1611 | // CLONE_NEWPID and CLONE_NEWUSER can be specified with CLONE_PARENT |
| 1612 | // (incorrect man pages). |
| 1613 | // |
| 1614 | |
| 1615 | LxtCheckErrno(ChildPid = fork()); |
| 1616 | if (ChildPid == 0) |
| 1617 | { |
| 1618 | NamespaceCloneInvalidChild(CLONE_NEWPID | CLONE_PARENT, &Pipe); |
| 1619 | } |
| 1620 | |
| 1621 | LxtCheckResult(read(Pipe.Read, &PipeData, sizeof(PipeData))); |
| 1622 | LxtCheckResult(LxtWaitPidPoll(PipeData, 0)); |
| 1623 | LxtCheckResult(LxtWaitPidPoll(ChildPid, 0)); |
| 1624 | |
| 1625 | // |
| 1626 | // CLONE_NEWIPC and CLONE_SYSVSEM are not allowed together. |
| 1627 | // |
| 1628 | |
| 1629 | LxtCheckErrnoFailure(ChildPid = LxtCloneSyscall(CLONE_NEWIPC | CLONE_SYSVSEM, NULL, NULL, NULL, NULL), EINVAL); |
| 1630 | |
| 1631 | // |
| 1632 | // TODO_LX: Enable the variation below when CLONE_NEWUSER is supported on |
| 1633 | // WSL. |
| 1634 | // |
| 1635 | |
| 1636 | /* |
| 1637 | LxtCheckErrno(ChildPid = fork()); |
| 1638 | if (ChildPid == 0) { |
| 1639 | NamespaceCloneInvalidChild(CLONE_NEWUSER | CLONE_PARENT, &Pipe); |
| 1640 | } |
| 1641 | |
| 1642 | LxtCheckResult(read(Pipe.Read, &PipeData, sizeof(PipeData))); |
| 1643 | LxtCheckResult(LxtWaitPidPoll(PipeData, 0)); |
| 1644 | LxtCheckResult(LxtWaitPidPoll(ChildPid, 0)); |
| 1645 | */ |
| 1646 | |
| 1647 | Result = 0; |
| 1648 | |
| 1649 | ErrorExit: |
| 1650 | if (ChildPid == 0) |
| 1651 | { |
| 1652 | _exit(Result); |
| 1653 | } |
| 1654 | |
| 1655 | LxtClosePipe(&Pipe); |
| 1656 | return Result; |
| 1657 | } |