| 1 | /*++ |
| 2 | |
| 3 | Copyright (c) Microsoft. All rights reserved. |
| 4 | |
| 5 | Module Name: |
| 6 | |
| 7 | mprotect.c |
| 8 | |
| 9 | Abstract: |
| 10 | |
| 11 | This file contains test cases for mprotect(). |
| 12 | |
| 13 | --*/ |
| 14 | |
| 15 | #include "lxtcommon.h" |
| 16 | #include "unittests.h" |
| 17 | #include <stdlib.h> |
| 18 | #include <stdio.h> |
| 19 | #include <string.h> |
| 20 | #include <sys/mman.h> |
| 21 | #include <sched.h> |
| 22 | #include <signal.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <sys/ioctl.h> |
| 26 | #include <sys/syscall.h> |
| 27 | #include <fcntl.h> |
| 28 | #include <errno.h> |
| 29 | #include <time.h> |
| 30 | |
| 31 | #define LXT_NAME "mprotect" |
| 32 | #define MAPPING_PAGE_SIZE 4096 |
| 33 | #define MAX_BUF_SIZE 256 |
| 34 | #define PROCFS_MNT "/proc" |
| 35 | |
| 36 | int MprotectMainVariation(PLXT_ARGS Args); |
| 37 | |
| 38 | int MunmapMainVariation(PLXT_ARGS Args); |
| 39 | |
| 40 | int MsyncMainVariation(PLXT_ARGS Args); |
| 41 | |
| 42 | int MadviseMainVariation(PLXT_ARGS Args); |
| 43 | |
| 44 | int MremapMainVariation(PLXT_ARGS Args); |
| 45 | |
| 46 | int MprotectStackVariation(PLXT_ARGS Args); |
| 47 | |
| 48 | static const LXT_VARIATION g_LxtVariations[] = { |
| 49 | {"mprotect main variation", MprotectMainVariation}, |
| 50 | {"munmap main variation", MunmapMainVariation}, |
| 51 | {"msync main variation", MsyncMainVariation}, |
| 52 | {"madvise main variation", MadviseMainVariation}, |
| 53 | {"mremap main variation", MremapMainVariation}, |
| 54 | {"mprotect stack variation", MprotectStackVariation}, |
| 55 | }; |
| 56 | |
| 57 | int MprotectMainVariation(PLXT_ARGS Args) |
| 58 | { |
| 59 | int Result; |
| 60 | int ROFileDescriptor; |
| 61 | int RWFileDescriptor; |
| 62 | char FileBuffer[3 * MAPPING_PAGE_SIZE]; |
| 63 | char* ROMapping; |
| 64 | char* RWMapping; |
| 65 | int MapSize; |
| 66 | char* RemappedMemory; |
| 67 | |
| 68 | MapSize = sizeof(FileBuffer); |
| 69 | |
| 70 | ROFileDescriptor = open("/data/mprotect_test.bin", O_RDONLY | O_CREAT | O_TRUNC, S_IRWXU); |
| 71 | |
| 72 | if (ROFileDescriptor == -1) |
| 73 | { |
| 74 | Result = errno; |
| 75 | LxtLogError("Could not create test file! %d", Result); |
| 76 | goto ErrorExit; |
| 77 | } |
| 78 | |
| 79 | RWFileDescriptor = open("/data/mprotect_test.bin", O_RDWR); |
| 80 | |
| 81 | if (RWFileDescriptor == -1) |
| 82 | { |
| 83 | Result = errno; |
| 84 | LxtLogError("Could not create test file! %d", Result); |
| 85 | goto ErrorExit; |
| 86 | } |
| 87 | |
| 88 | write(RWFileDescriptor, FileBuffer, MapSize); |
| 89 | |
| 90 | ROMapping = mmap(NULL, MapSize, PROT_READ, MAP_SHARED, ROFileDescriptor, 0); |
| 91 | |
| 92 | if (ROMapping == MAP_FAILED) |
| 93 | { |
| 94 | Result = errno; |
| 95 | LxtLogError("ROMapping allocation failed! %d", Result); |
| 96 | goto ErrorExit; |
| 97 | } |
| 98 | |
| 99 | LxtLogInfo("ROMapping: %p", ROMapping); |
| 100 | |
| 101 | RWMapping = mmap(NULL, MapSize, PROT_READ, MAP_SHARED, RWFileDescriptor, 0); |
| 102 | |
| 103 | if (RWMapping == MAP_FAILED) |
| 104 | { |
| 105 | Result = errno; |
| 106 | LxtLogError("ROMapping allocation failed! %d", Result); |
| 107 | goto ErrorExit; |
| 108 | } |
| 109 | |
| 110 | LxtLogInfo("RWMapping: %p", RWMapping); |
| 111 | |
| 112 | // |
| 113 | // Checking behavior of mprotect with zero size mappings. |
| 114 | // |
| 115 | |
| 116 | LxtLogInfo("Checking mprotect behavior with zero size mappings") LxtCheckErrno(mprotect(NULL, 0, PROT_WRITE)); |
| 117 | LxtCheckErrno(mprotect(NULL, 0, 0xDEADBEEF)); |
| 118 | LxtCheckErrno(mprotect(RWMapping, 0, 0xDEADBEEF)); |
| 119 | LxtCheckErrno(mprotect(ROMapping, 0, PROT_WRITE)); |
| 120 | LxtCheckErrno(mprotect(ROMapping, 0, PROT_READ)); |
| 121 | LxtCheckErrno(mprotect(RWMapping, 0, PROT_WRITE)); |
| 122 | LxtCheckErrno(mprotect(RWMapping, 0, PROT_READ)); |
| 123 | |
| 124 | // |
| 125 | // Check behavior of mprotect with a bad address. |
| 126 | // |
| 127 | |
| 128 | LxtLogInfo("Checking mprotect behavior with a bad address") LxtCheckErrnoFailure(mprotect(NULL, MAPPING_PAGE_SIZE, PROT_WRITE), ENOMEM); |
| 129 | LxtCheckErrnoFailure(mprotect(RWMapping + 300, MAPPING_PAGE_SIZE, PROT_WRITE), EINVAL); |
| 130 | |
| 131 | // |
| 132 | // Check behavior with bad protection flags. |
| 133 | // |
| 134 | |
| 135 | LxtLogInfo("Checking mprotect behavior with bad protection flags") |
| 136 | LxtCheckErrnoFailure(mprotect(RWMapping, MAPPING_PAGE_SIZE, 0xDEADBEEF), EINVAL); |
| 137 | |
| 138 | // |
| 139 | // Checking mprotect on non-zero size mappings. |
| 140 | // |
| 141 | |
| 142 | Result = mprotect(RWMapping, MAPPING_PAGE_SIZE, PROT_WRITE); |
| 143 | |
| 144 | if (Result == -1) |
| 145 | { |
| 146 | Result = errno; |
| 147 | LxtLogError("Protection change failed unexpectedly! %d", Result); |
| 148 | goto ErrorExit; |
| 149 | } |
| 150 | |
| 151 | LxtLogInfo("RWMapping protection succeeded"); |
| 152 | |
| 153 | Result = mprotect(ROMapping, MAPPING_PAGE_SIZE, PROT_WRITE); |
| 154 | |
| 155 | if (Result != -1) |
| 156 | { |
| 157 | LxtLogError("Protection change on RO file succeeded unexpectedly!"); |
| 158 | goto ErrorExit; |
| 159 | } |
| 160 | |
| 161 | Result = errno; |
| 162 | if (Result != EACCES) |
| 163 | { |
| 164 | LxtLogError("RO protection change failed but not with EACCES! %d", Result); |
| 165 | goto ErrorExit; |
| 166 | } |
| 167 | |
| 168 | LxtLogInfo("ROMapping protection failed as expected"); |
| 169 | |
| 170 | RemappedMemory = mremap(ROMapping, MAPPING_PAGE_SIZE, 2 * MAPPING_PAGE_SIZE, MREMAP_MAYMOVE); |
| 171 | |
| 172 | if (RemappedMemory == MAP_FAILED) |
| 173 | { |
| 174 | Result = errno; |
| 175 | LxtLogError("Remap on RO file failed unexpectedly! %d!", Result); |
| 176 | goto ErrorExit; |
| 177 | } |
| 178 | |
| 179 | LxtLogInfo("Remapping succeeded"); |
| 180 | |
| 181 | RemappedMemory = mremap(RWMapping, MAPPING_PAGE_SIZE, 2 * MAPPING_PAGE_SIZE, MREMAP_MAYMOVE); |
| 182 | |
| 183 | if (RemappedMemory == MAP_FAILED) |
| 184 | { |
| 185 | Result = errno; |
| 186 | LxtLogError("Remap on RO file failed unexpectedly! %d!", Result); |
| 187 | goto ErrorExit; |
| 188 | } |
| 189 | |
| 190 | LxtLogInfo("Remapping succeeded"); |
| 191 | LxtLogPassed("Success!"); |
| 192 | Result = 0; |
| 193 | |
| 194 | ErrorExit: |
| 195 | |
| 196 | return Result; |
| 197 | } |
| 198 | |
| 199 | int MunmapMainVariation(PLXT_ARGS Args) |
| 200 | { |
| 201 | char FileBuffer[3 * MAPPING_PAGE_SIZE]; |
| 202 | int MapSize; |
| 203 | int Result; |
| 204 | int RWFileDescriptor; |
| 205 | char* RWMapping; |
| 206 | |
| 207 | // |
| 208 | // Create a file and write garbage data to it. |
| 209 | // |
| 210 | |
| 211 | MapSize = sizeof(FileBuffer); |
| 212 | RWFileDescriptor = open("/data/mprotect_test.bin", O_CREAT | O_TRUNC | O_RDWR, S_IRWXU); |
| 213 | |
| 214 | if (RWFileDescriptor == -1) |
| 215 | { |
| 216 | Result = errno; |
| 217 | LxtLogError("Could not create test file! %d", Result); |
| 218 | goto ErrorExit; |
| 219 | } |
| 220 | |
| 221 | write(RWFileDescriptor, FileBuffer, MapSize); |
| 222 | |
| 223 | // |
| 224 | // Map a memory segment that will be backed by the file. |
| 225 | // |
| 226 | |
| 227 | RWMapping = mmap(NULL, MapSize, PROT_READ, MAP_SHARED, RWFileDescriptor, 0); |
| 228 | |
| 229 | if (RWMapping == MAP_FAILED) |
| 230 | { |
| 231 | Result = errno; |
| 232 | LxtLogError("ROMapping allocation failed! %d", Result); |
| 233 | goto ErrorExit; |
| 234 | } |
| 235 | |
| 236 | LxtLogInfo("RWMapping: %p", RWMapping); |
| 237 | |
| 238 | // |
| 239 | // Check different variations of bad arguments with munmap. |
| 240 | // |
| 241 | |
| 242 | LxtLogInfo("Checking munmap with bad arguments"); |
| 243 | LxtCheckErrnoFailure(munmap(NULL, 0), EINVAL); |
| 244 | LxtCheckErrnoFailure(munmap(RWMapping, 0), EINVAL); |
| 245 | LxtCheckErrnoFailure(munmap(RWMapping + 300, MapSize), EINVAL); |
| 246 | LxtCheckErrno(munmap(NULL, MapSize)); |
| 247 | |
| 248 | // |
| 249 | // Unmap the memory mapping. |
| 250 | // |
| 251 | |
| 252 | LxtLogInfo("Unmapping the mapping"); |
| 253 | LxtCheckErrno(munmap(RWMapping, MapSize)); |
| 254 | |
| 255 | // |
| 256 | // All tests passed at this point. |
| 257 | // |
| 258 | |
| 259 | LxtLogPassed("Success!") Result = 0; |
| 260 | |
| 261 | ErrorExit: |
| 262 | if (RWFileDescriptor >= 0) |
| 263 | { |
| 264 | if (LxtClose(RWFileDescriptor) < 0) |
| 265 | { |
| 266 | LxtLogInfo("Failed to close test file at the end of the test"); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | return Result; |
| 271 | } |
| 272 | |
| 273 | int MsyncMainVariation(PLXT_ARGS Args) |
| 274 | { |
| 275 | char FileBuffer[3 * MAPPING_PAGE_SIZE]; |
| 276 | int MapSize; |
| 277 | int Result; |
| 278 | int RWFileDescriptor; |
| 279 | char* RWMapping; |
| 280 | |
| 281 | // |
| 282 | // Create a file and write garbage data to it. |
| 283 | // |
| 284 | |
| 285 | MapSize = sizeof(FileBuffer); |
| 286 | RWFileDescriptor = open("/data/mprotect_test.bin", O_CREAT | O_TRUNC | O_RDWR, S_IRWXU); |
| 287 | |
| 288 | if (RWFileDescriptor == -1) |
| 289 | { |
| 290 | Result = errno; |
| 291 | LxtLogError("Could not create test file! %d", Result); |
| 292 | goto ErrorExit; |
| 293 | } |
| 294 | |
| 295 | write(RWFileDescriptor, FileBuffer, MapSize); |
| 296 | |
| 297 | // |
| 298 | // Map a memory segment that will be backed by the file. |
| 299 | // |
| 300 | |
| 301 | RWMapping = mmap(NULL, MapSize, PROT_READ | PROT_WRITE, MAP_SHARED, RWFileDescriptor, 0); |
| 302 | |
| 303 | if (RWMapping == MAP_FAILED) |
| 304 | { |
| 305 | Result = errno; |
| 306 | LxtLogError("ROMapping allocation failed! %d", Result); |
| 307 | goto ErrorExit; |
| 308 | } |
| 309 | |
| 310 | LxtLogInfo("RWMapping: %p", RWMapping); |
| 311 | |
| 312 | // |
| 313 | // Read the first byte from the file, increment it and write it back. |
| 314 | // |
| 315 | |
| 316 | *RWMapping = *RWMapping + 1; |
| 317 | |
| 318 | // |
| 319 | // Checking behavior of msync with zero length. |
| 320 | // |
| 321 | |
| 322 | LxtLogInfo("Checking msync behavior with zero length") LxtCheckErrno(msync(NULL, 0, MS_SYNC)); |
| 323 | LxtCheckErrno(msync(RWMapping, 0, MS_SYNC)); |
| 324 | LxtCheckErrnoFailure(msync(NULL, 0, 0xDEADBEEF), EINVAL); |
| 325 | LxtCheckErrnoFailure(msync(RWMapping, 0, 0xDEADBEEF), EINVAL); |
| 326 | |
| 327 | // |
| 328 | // Check behavior of mprotect with a bad address. |
| 329 | // |
| 330 | |
| 331 | LxtLogInfo("Checking msync behavior with a bad address") LxtCheckErrnoFailure(msync(NULL, MAPPING_PAGE_SIZE, MS_SYNC), ENOMEM); |
| 332 | LxtCheckErrnoFailure(msync(RWMapping + 300, MAPPING_PAGE_SIZE, MS_SYNC), EINVAL); |
| 333 | |
| 334 | // |
| 335 | // Check behavior of msync with bad flags. |
| 336 | // |
| 337 | |
| 338 | LxtLogInfo("Checking msync behavior with bad protection flags") |
| 339 | LxtCheckErrnoFailure(msync(RWMapping, MAPPING_PAGE_SIZE, 0xDEADBEEF), EINVAL); |
| 340 | |
| 341 | // |
| 342 | // Sync the changes. |
| 343 | // |
| 344 | |
| 345 | LxtLogInfo("Sync the changes to the file"); |
| 346 | LxtCheckErrno(msync(RWMapping, MAPPING_PAGE_SIZE, MS_SYNC)); |
| 347 | |
| 348 | // |
| 349 | // All tests passed at this point. |
| 350 | // |
| 351 | |
| 352 | LxtLogPassed("Success!") Result = 0; |
| 353 | |
| 354 | ErrorExit: |
| 355 | if (RWFileDescriptor >= 0) |
| 356 | { |
| 357 | if (LxtClose(RWFileDescriptor) < 0) |
| 358 | { |
| 359 | LxtLogInfo("Failed to close test file at the end of the test"); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | return Result; |
| 364 | } |
| 365 | |
| 366 | int MadviseMainVariation(PLXT_ARGS Args) |
| 367 | { |
| 368 | char FileBuffer[3 * MAPPING_PAGE_SIZE]; |
| 369 | int MapSize; |
| 370 | int Result; |
| 371 | int RWFileDescriptor; |
| 372 | char* RWMapping; |
| 373 | char DummyByte; |
| 374 | |
| 375 | // |
| 376 | // Create a file and write garbage data to it. |
| 377 | // |
| 378 | |
| 379 | MapSize = sizeof(FileBuffer); |
| 380 | RWFileDescriptor = open("/data/mprotect_test.bin", O_CREAT | O_TRUNC | O_RDWR, S_IRWXU); |
| 381 | |
| 382 | if (RWFileDescriptor == -1) |
| 383 | { |
| 384 | Result = errno; |
| 385 | LxtLogError("Could not create test file! %d", Result); |
| 386 | goto ErrorExit; |
| 387 | } |
| 388 | |
| 389 | write(RWFileDescriptor, FileBuffer, MapSize); |
| 390 | |
| 391 | // |
| 392 | // Map a memory segment that will be backed by the file. |
| 393 | // |
| 394 | |
| 395 | RWMapping = mmap(NULL, MapSize, PROT_READ | PROT_WRITE, MAP_SHARED, RWFileDescriptor, 0); |
| 396 | |
| 397 | if (RWMapping == MAP_FAILED) |
| 398 | { |
| 399 | Result = errno; |
| 400 | LxtLogError("ROMapping allocation failed! %d", Result); |
| 401 | goto ErrorExit; |
| 402 | } |
| 403 | |
| 404 | LxtLogInfo("RWMapping: %p", RWMapping); |
| 405 | |
| 406 | // |
| 407 | // Checking behavior of mremap with zero length. |
| 408 | // |
| 409 | |
| 410 | LxtLogInfo("Checking madvise behavior with zero length") LxtCheckErrno(madvise(NULL, 0, MADV_RANDOM)); |
| 411 | LxtCheckErrno(madvise(RWMapping, 0, MADV_RANDOM)); |
| 412 | LxtCheckErrnoFailure(madvise(NULL, 0, 0xDEADBEEF), EINVAL); |
| 413 | LxtCheckErrnoFailure(madvise(RWMapping, 0, 0xDEADBEEF), EINVAL); |
| 414 | |
| 415 | // |
| 416 | // Check behavior of madvise with a bad address. |
| 417 | // |
| 418 | |
| 419 | LxtLogInfo("Checking madvise behavior with a bad address") LxtCheckErrnoFailure(madvise(NULL, MAPPING_PAGE_SIZE, MADV_RANDOM), ENOMEM); |
| 420 | LxtCheckErrnoFailure(madvise(RWMapping + 300, MAPPING_PAGE_SIZE, MADV_RANDOM), EINVAL); |
| 421 | |
| 422 | // |
| 423 | // Check behavior of madvise with bad flags. |
| 424 | // |
| 425 | |
| 426 | LxtLogInfo("Checking madvise behavior with bad protection flags") |
| 427 | LxtCheckErrnoFailure(madvise(RWMapping, MAPPING_PAGE_SIZE, 0xDEADBEEF), EINVAL); |
| 428 | |
| 429 | // |
| 430 | // Advise the kernel on access partners. |
| 431 | // |
| 432 | |
| 433 | LxtLogInfo("Advise the kernel on access patterns."); |
| 434 | LxtCheckErrno(madvise(RWMapping, MAPPING_PAGE_SIZE, MADV_RANDOM)); |
| 435 | |
| 436 | // |
| 437 | // All tests passed at this point. |
| 438 | // |
| 439 | |
| 440 | LxtLogPassed("Success!") Result = 0; |
| 441 | |
| 442 | ErrorExit: |
| 443 | if (RWFileDescriptor >= 0) |
| 444 | { |
| 445 | if (LxtClose(RWFileDescriptor) < 0) |
| 446 | { |
| 447 | LxtLogInfo("Failed to close test file at the end of the test"); |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | return Result; |
| 452 | } |
| 453 | |
| 454 | int MremapMainVariation(PLXT_ARGS Args) |
| 455 | { |
| 456 | char FileBuffer[3 * MAPPING_PAGE_SIZE]; |
| 457 | int MapSize; |
| 458 | char* RemappedMemory; |
| 459 | int Result; |
| 460 | int RWFileDescriptor; |
| 461 | char* RWMapping; |
| 462 | char DummyByte; |
| 463 | |
| 464 | // |
| 465 | // Create a file and write garbage data to it. |
| 466 | // |
| 467 | |
| 468 | MapSize = sizeof(FileBuffer); |
| 469 | RWFileDescriptor = open("/data/mprotect_test.bin", O_CREAT | O_TRUNC | O_RDWR, S_IRWXU); |
| 470 | |
| 471 | if (RWFileDescriptor == -1) |
| 472 | { |
| 473 | Result = errno; |
| 474 | LxtLogError("Could not create test file! %d", Result); |
| 475 | goto ErrorExit; |
| 476 | } |
| 477 | |
| 478 | write(RWFileDescriptor, FileBuffer, MapSize); |
| 479 | |
| 480 | // |
| 481 | // Map a memory segment that will be backed by the file. |
| 482 | // |
| 483 | |
| 484 | RWMapping = mmap(NULL, MapSize, PROT_READ | PROT_WRITE, MAP_SHARED, RWFileDescriptor, 0); |
| 485 | |
| 486 | if (RWMapping == MAP_FAILED) |
| 487 | { |
| 488 | Result = errno; |
| 489 | LxtLogError("ROMapping allocation failed! %d", Result); |
| 490 | goto ErrorExit; |
| 491 | } |
| 492 | |
| 493 | LxtLogInfo("RWMapping: %p", RWMapping); |
| 494 | |
| 495 | // |
| 496 | // Checking behavior of mremap with bad arguments. |
| 497 | // |
| 498 | |
| 499 | LxtLogInfo("Checking mremap behavior with bad arguments"); |
| 500 | |
| 501 | #pragma GCC diagnostic push |
| 502 | #pragma GCC diagnostic ignored "-Wpointer-to-int-cast" |
| 503 | |
| 504 | LxtCheckErrnoFailure((int)mremap(NULL, MAPPING_PAGE_SIZE, 2 * MAPPING_PAGE_SIZE, MREMAP_MAYMOVE), EFAULT); |
| 505 | |
| 506 | LxtCheckErrnoFailure((int)mremap(RWMapping, MAPPING_PAGE_SIZE, 2 * MAPPING_PAGE_SIZE, 0xDEADBEEF), EINVAL); |
| 507 | |
| 508 | LxtCheckErrnoFailure((int)mremap(RWMapping, MAPPING_PAGE_SIZE, 0, 0xDEADBEEF), EINVAL); |
| 509 | |
| 510 | LxtCheckErrnoFailure((int)mremap(NULL, 0, 2 * MAPPING_PAGE_SIZE, MREMAP_MAYMOVE), EFAULT); |
| 511 | |
| 512 | LxtCheckErrnoFailure((int)mremap(NULL, 0, 0, 0xDEADBEEF), EINVAL); |
| 513 | |
| 514 | LxtCheckErrnoFailure((int)mremap(NULL, 0, 2 * MAPPING_PAGE_SIZE, 0xDEADBEEF), EINVAL); |
| 515 | |
| 516 | LxtCheckErrnoFailure((int)mremap(RWMapping, 0, 0, MREMAP_MAYMOVE), EINVAL); |
| 517 | |
| 518 | LxtCheckErrnoFailure((int)mremap(NULL, 0, 0, MREMAP_MAYMOVE), EINVAL); |
| 519 | |
| 520 | LxtCheckErrnoFailure((int)mremap(NULL, MAPPING_PAGE_SIZE, 2 * MAPPING_PAGE_SIZE, 0xDEADBEEF), EINVAL); |
| 521 | |
| 522 | LxtCheckErrnoFailure((int)mremap(RWMapping + 300, MAPPING_PAGE_SIZE, 2 * MAPPING_PAGE_SIZE, MREMAP_MAYMOVE), EINVAL); |
| 523 | |
| 524 | LxtCheckErrnoFailure((int)mremap(RWMapping, MAPPING_PAGE_SIZE, 0, MREMAP_MAYMOVE), EINVAL); |
| 525 | |
| 526 | #pragma GCC diagnostic pop |
| 527 | |
| 528 | // |
| 529 | // Success cases. |
| 530 | // |
| 531 | |
| 532 | // |
| 533 | // Shrink the mapped memory. |
| 534 | // |
| 535 | |
| 536 | RemappedMemory = (char*)mremap(RWMapping, 3 * MAPPING_PAGE_SIZE, 2 * MAPPING_PAGE_SIZE, MREMAP_MAYMOVE); |
| 537 | |
| 538 | if (RemappedMemory == MAP_FAILED) |
| 539 | { |
| 540 | LxtLogInfo("Mapping Failed"); |
| 541 | Result = errno; |
| 542 | goto ErrorExit; |
| 543 | } |
| 544 | |
| 545 | LxtLogInfo("RemappedMemory = %p", RemappedMemory); |
| 546 | |
| 547 | // |
| 548 | // All tests passed at this point. |
| 549 | // |
| 550 | |
| 551 | LxtLogPassed("Success!") Result = 0; |
| 552 | |
| 553 | ErrorExit: |
| 554 | if (RWFileDescriptor >= 0) |
| 555 | { |
| 556 | if (LxtClose(RWFileDescriptor) < 0) |
| 557 | { |
| 558 | LxtLogInfo("Failed to close test file at the end of the test"); |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | return Result; |
| 563 | } |
| 564 | |
| 565 | int MprotectStackVariation(PLXT_ARGS Args) |
| 566 | |
| 567 | { |
| 568 | |
| 569 | void* Address; |
| 570 | int Result; |
| 571 | char StackBuffer[20000]; |
| 572 | |
| 573 | // |
| 574 | // Ensure PROT_GROWSDOWN doesn't work on normal allocations. |
| 575 | // |
| 576 | |
| 577 | Address = mmap(NULL, 4096, PROT_NONE, MAP_ANONYMOUS, -1, 0); |
| 578 | LxtCheckErrnoFailure(mprotect(Address, 4096, PROT_READ | PROT_WRITE | PROT_GROWSDOWN), EINVAL); |
| 579 | munmap(Address, 4096); |
| 580 | |
| 581 | // |
| 582 | // Make sure PROT_GROWSDOWN works on the stack. There's not an easy |
| 583 | // way to validate that it actually worked without parsing /proc/self/maps... |
| 584 | // |
| 585 | |
| 586 | StackBuffer[0] = 'x'; |
| 587 | Address = (void*)(((long)StackBuffer + sizeof(StackBuffer)) & ~4095); |
| 588 | LxtCheckErrno(mprotect(Address, 4096, PROT_READ | PROT_WRITE | PROT_GROWSDOWN)); |
| 589 | |
| 590 | Result = 0; |
| 591 | |
| 592 | ErrorExit: |
| 593 | return Result; |
| 594 | } |
| 595 | |
| 596 | int MprotectTestEntry(int Argc, char* Argv[]) |
| 597 | { |
| 598 | |
| 599 | LXT_ARGS Args; |
| 600 | int Result; |
| 601 | |
| 602 | LxtCheckResult(LxtInitialize(Argc, Argv, &Args, LXT_NAME)); |
| 603 | LxtCheckResult(LxtRunVariations(&Args, g_LxtVariations, LXT_COUNT_OF(g_LxtVariations))); |
| 604 | |
| 605 | ErrorExit: |
| 606 | LxtUninitialize(); |
| 607 | return LXT_RESULT_SUCCESS; |
| 608 | } |