msan_interceptors.cc revision 3f4beff5efdd0d30844ca8b270876f7d59a608e7
1//===-- msan_interceptors.cc ----------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file is a part of MemorySanitizer. 11// 12// Interceptors for standard library functions. 13// 14// FIXME: move as many interceptors as possible into 15// sanitizer_common/sanitizer_common_interceptors.h 16//===----------------------------------------------------------------------===// 17 18#include "interception/interception.h" 19#include "msan.h" 20#include "sanitizer_common/sanitizer_platform_limits_posix.h" 21#include "sanitizer_common/sanitizer_allocator.h" 22#include "sanitizer_common/sanitizer_allocator_internal.h" 23#include "sanitizer_common/sanitizer_atomic.h" 24#include "sanitizer_common/sanitizer_common.h" 25#include "sanitizer_common/sanitizer_stackdepot.h" 26#include "sanitizer_common/sanitizer_libc.h" 27#include "sanitizer_common/sanitizer_linux.h" 28 29#include <stdarg.h> 30// ACHTUNG! No other system header includes in this file. 31// Ideally, we should get rid of stdarg.h as well. 32 33using namespace __msan; 34 35using __sanitizer::memory_order; 36using __sanitizer::atomic_load; 37using __sanitizer::atomic_store; 38using __sanitizer::atomic_uintptr_t; 39 40// True if this is a nested interceptor. 41static THREADLOCAL int in_interceptor_scope; 42 43struct InterceptorScope { 44 InterceptorScope() { ++in_interceptor_scope; } 45 ~InterceptorScope() { --in_interceptor_scope; } 46}; 47 48bool IsInInterceptorScope() { 49 return in_interceptor_scope; 50} 51 52#define ENSURE_MSAN_INITED() do { \ 53 CHECK(!msan_init_is_running); \ 54 if (!msan_inited) { \ 55 __msan_init(); \ 56 } \ 57} while (0) 58 59// Check that [x, x+n) range is unpoisoned. 60#define CHECK_UNPOISONED_0(x, n) \ 61 do { \ 62 sptr offset = __msan_test_shadow(x, n); \ 63 if (__msan::IsInSymbolizer()) break; \ 64 if (offset >= 0 && __msan::flags()->report_umrs) { \ 65 GET_CALLER_PC_BP_SP; \ 66 (void) sp; \ 67 Printf("UMR in %s at offset %d inside [%p, +%d) \n", __FUNCTION__, \ 68 offset, x, n); \ 69 __msan::PrintWarningWithOrigin(pc, bp, \ 70 __msan_get_origin((char *)x + offset)); \ 71 if (__msan::flags()->halt_on_error) { \ 72 Printf("Exiting\n"); \ 73 Die(); \ 74 } \ 75 } \ 76 } while (0) 77 78// Check that [x, x+n) range is unpoisoned unless we are in a nested 79// interceptor. 80#define CHECK_UNPOISONED(x, n) \ 81 do { \ 82 if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \ 83 } while (0); 84 85static void *fast_memset(void *ptr, int c, SIZE_T n); 86static void *fast_memcpy(void *dst, const void *src, SIZE_T n); 87 88INTERCEPTOR(SIZE_T, fread, void *ptr, SIZE_T size, SIZE_T nmemb, void *file) { 89 ENSURE_MSAN_INITED(); 90 SIZE_T res = REAL(fread)(ptr, size, nmemb, file); 91 if (res > 0) 92 __msan_unpoison(ptr, res *size); 93 return res; 94} 95 96INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb, 97 void *file) { 98 ENSURE_MSAN_INITED(); 99 SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file); 100 if (res > 0) 101 __msan_unpoison(ptr, res *size); 102 return res; 103} 104 105INTERCEPTOR(SSIZE_T, readlink, const char *path, char *buf, SIZE_T bufsiz) { 106 ENSURE_MSAN_INITED(); 107 SSIZE_T res = REAL(readlink)(path, buf, bufsiz); 108 if (res > 0) 109 __msan_unpoison(buf, res); 110 return res; 111} 112 113INTERCEPTOR(void *, memcpy, void *dest, const void *src, SIZE_T n) { 114 return __msan_memcpy(dest, src, n); 115} 116 117INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) { 118 return (char *)__msan_memcpy(dest, src, n) + n; 119} 120 121INTERCEPTOR(void *, memmove, void *dest, const void *src, SIZE_T n) { 122 return __msan_memmove(dest, src, n); 123} 124 125INTERCEPTOR(void *, memset, void *s, int c, SIZE_T n) { 126 return __msan_memset(s, c, n); 127} 128 129INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) { 130 return __msan_memmove(dest, src, n); 131} 132 133INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) { 134 GET_MALLOC_STACK_TRACE; 135 CHECK_EQ(alignment & (alignment - 1), 0); 136 CHECK_NE(memptr, 0); 137 *memptr = MsanReallocate(&stack, 0, size, alignment, false); 138 CHECK_NE(*memptr, 0); 139 __msan_unpoison(memptr, sizeof(*memptr)); 140 return 0; 141} 142 143INTERCEPTOR(void *, memalign, SIZE_T boundary, SIZE_T size) { 144 GET_MALLOC_STACK_TRACE; 145 CHECK_EQ(boundary & (boundary - 1), 0); 146 void *ptr = MsanReallocate(&stack, 0, size, boundary, false); 147 return ptr; 148} 149 150INTERCEPTOR(void *, valloc, SIZE_T size) { 151 GET_MALLOC_STACK_TRACE; 152 void *ptr = MsanReallocate(&stack, 0, size, GetPageSizeCached(), false); 153 return ptr; 154} 155 156INTERCEPTOR(void *, pvalloc, SIZE_T size) { 157 GET_MALLOC_STACK_TRACE; 158 uptr PageSize = GetPageSizeCached(); 159 size = RoundUpTo(size, PageSize); 160 if (size == 0) { 161 // pvalloc(0) should allocate one page. 162 size = PageSize; 163 } 164 void *ptr = MsanReallocate(&stack, 0, size, PageSize, false); 165 return ptr; 166} 167 168INTERCEPTOR(void, free, void *ptr) { 169 GET_MALLOC_STACK_TRACE; 170 if (ptr == 0) return; 171 MsanDeallocate(&stack, ptr); 172} 173 174INTERCEPTOR(SIZE_T, strlen, const char *s) { 175 ENSURE_MSAN_INITED(); 176 SIZE_T res = REAL(strlen)(s); 177 CHECK_UNPOISONED(s, res + 1); 178 return res; 179} 180 181INTERCEPTOR(SIZE_T, strnlen, const char *s, SIZE_T n) { 182 ENSURE_MSAN_INITED(); 183 SIZE_T res = REAL(strnlen)(s, n); 184 SIZE_T scan_size = (res == n) ? res : res + 1; 185 CHECK_UNPOISONED(s, scan_size); 186 return res; 187} 188 189// FIXME: Add stricter shadow checks in str* interceptors (ex.: strcpy should 190// check the shadow of the terminating \0 byte). 191 192INTERCEPTOR(char *, strcpy, char *dest, const char *src) { // NOLINT 193 ENSURE_MSAN_INITED(); 194 SIZE_T n = REAL(strlen)(src); 195 char *res = REAL(strcpy)(dest, src); // NOLINT 196 __msan_copy_poison(dest, src, n + 1); 197 return res; 198} 199 200INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { // NOLINT 201 ENSURE_MSAN_INITED(); 202 SIZE_T copy_size = REAL(strnlen)(src, n); 203 if (copy_size < n) 204 copy_size++; // trailing \0 205 char *res = REAL(strncpy)(dest, src, n); // NOLINT 206 __msan_copy_poison(dest, src, copy_size); 207 return res; 208} 209 210INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { // NOLINT 211 ENSURE_MSAN_INITED(); 212 SIZE_T n = REAL(strlen)(src); 213 char *res = REAL(stpcpy)(dest, src); // NOLINT 214 __msan_copy_poison(dest, src, n + 1); 215 return res; 216} 217 218INTERCEPTOR(char *, strdup, char *src) { 219 ENSURE_MSAN_INITED(); 220 SIZE_T n = REAL(strlen)(src); 221 char *res = REAL(strdup)(src); 222 __msan_copy_poison(res, src, n + 1); 223 return res; 224} 225 226INTERCEPTOR(char *, __strdup, char *src) { 227 ENSURE_MSAN_INITED(); 228 SIZE_T n = REAL(strlen)(src); 229 char *res = REAL(__strdup)(src); 230 __msan_copy_poison(res, src, n + 1); 231 return res; 232} 233 234INTERCEPTOR(char *, strndup, char *src, SIZE_T n) { 235 ENSURE_MSAN_INITED(); 236 SIZE_T copy_size = REAL(strnlen)(src, n); 237 char *res = REAL(strndup)(src, n); 238 __msan_copy_poison(res, src, copy_size); 239 __msan_unpoison(res + copy_size, 1); // \0 240 return res; 241} 242 243INTERCEPTOR(char *, __strndup, char *src, SIZE_T n) { 244 ENSURE_MSAN_INITED(); 245 SIZE_T copy_size = REAL(strnlen)(src, n); 246 char *res = REAL(__strndup)(src, n); 247 __msan_copy_poison(res, src, copy_size); 248 __msan_unpoison(res + copy_size, 1); // \0 249 return res; 250} 251 252INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) { 253 ENSURE_MSAN_INITED(); 254 char *res = REAL(gcvt)(number, ndigit, buf); 255 // DynamoRio tool will take care of unpoisoning gcvt result for us. 256 if (!__msan_has_dynamic_component()) { 257 SIZE_T n = REAL(strlen)(buf); 258 __msan_unpoison(buf, n + 1); 259 } 260 return res; 261} 262 263INTERCEPTOR(char *, strcat, char *dest, const char *src) { // NOLINT 264 ENSURE_MSAN_INITED(); 265 SIZE_T src_size = REAL(strlen)(src); 266 SIZE_T dest_size = REAL(strlen)(dest); 267 char *res = REAL(strcat)(dest, src); // NOLINT 268 __msan_copy_poison(dest + dest_size, src, src_size + 1); 269 return res; 270} 271 272INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { // NOLINT 273 ENSURE_MSAN_INITED(); 274 SIZE_T dest_size = REAL(strlen)(dest); 275 SIZE_T copy_size = REAL(strlen)(src); 276 if (copy_size < n) 277 copy_size++; // trailing \0 278 char *res = REAL(strncat)(dest, src, n); // NOLINT 279 __msan_copy_poison(dest + dest_size, src, copy_size); 280 return res; 281} 282 283INTERCEPTOR(long, strtol, const char *nptr, char **endptr, // NOLINT 284 int base) { 285 ENSURE_MSAN_INITED(); 286 long res = REAL(strtol)(nptr, endptr, base); // NOLINT 287 if (!__msan_has_dynamic_component()) { 288 __msan_unpoison(endptr, sizeof(*endptr)); 289 } 290 return res; 291} 292 293INTERCEPTOR(long long, strtoll, const char *nptr, char **endptr, // NOLINT 294 int base) { 295 ENSURE_MSAN_INITED(); 296 long res = REAL(strtoll)(nptr, endptr, base); //NOLINT 297 if (!__msan_has_dynamic_component()) { 298 __msan_unpoison(endptr, sizeof(*endptr)); 299 } 300 return res; 301} 302 303INTERCEPTOR(unsigned long, strtoul, const char *nptr, char **endptr, // NOLINT 304 int base) { 305 ENSURE_MSAN_INITED(); 306 unsigned long res = REAL(strtoul)(nptr, endptr, base); // NOLINT 307 if (!__msan_has_dynamic_component()) { 308 __msan_unpoison(endptr, sizeof(*endptr)); 309 } 310 return res; 311} 312 313INTERCEPTOR(unsigned long long, strtoull, const char *nptr, // NOLINT 314 char **endptr, int base) { 315 ENSURE_MSAN_INITED(); 316 unsigned long res = REAL(strtoull)(nptr, endptr, base); // NOLINT 317 if (!__msan_has_dynamic_component()) { 318 __msan_unpoison(endptr, sizeof(*endptr)); 319 } 320 return res; 321} 322 323INTERCEPTOR(double, strtod, const char *nptr, char **endptr) { // NOLINT 324 ENSURE_MSAN_INITED(); 325 double res = REAL(strtod)(nptr, endptr); // NOLINT 326 if (!__msan_has_dynamic_component()) { 327 __msan_unpoison(endptr, sizeof(*endptr)); 328 } 329 return res; 330} 331 332INTERCEPTOR(double, strtod_l, const char *nptr, char **endptr, 333 void *loc) { // NOLINT 334 ENSURE_MSAN_INITED(); 335 double res = REAL(strtod_l)(nptr, endptr, loc); // NOLINT 336 if (!__msan_has_dynamic_component()) { 337 __msan_unpoison(endptr, sizeof(*endptr)); 338 } 339 return res; 340} 341 342INTERCEPTOR(double, __strtod_l, const char *nptr, char **endptr, 343 void *loc) { // NOLINT 344 ENSURE_MSAN_INITED(); 345 double res = REAL(__strtod_l)(nptr, endptr, loc); // NOLINT 346 if (!__msan_has_dynamic_component()) { 347 __msan_unpoison(endptr, sizeof(*endptr)); 348 } 349 return res; 350} 351 352INTERCEPTOR(float, strtof, const char *nptr, char **endptr) { // NOLINT 353 ENSURE_MSAN_INITED(); 354 float res = REAL(strtof)(nptr, endptr); // NOLINT 355 if (!__msan_has_dynamic_component()) { 356 __msan_unpoison(endptr, sizeof(*endptr)); 357 } 358 return res; 359} 360 361INTERCEPTOR(float, strtof_l, const char *nptr, char **endptr, 362 void *loc) { // NOLINT 363 ENSURE_MSAN_INITED(); 364 float res = REAL(strtof_l)(nptr, endptr, loc); // NOLINT 365 if (!__msan_has_dynamic_component()) { 366 __msan_unpoison(endptr, sizeof(*endptr)); 367 } 368 return res; 369} 370 371INTERCEPTOR(float, __strtof_l, const char *nptr, char **endptr, 372 void *loc) { // NOLINT 373 ENSURE_MSAN_INITED(); 374 float res = REAL(__strtof_l)(nptr, endptr, loc); // NOLINT 375 if (!__msan_has_dynamic_component()) { 376 __msan_unpoison(endptr, sizeof(*endptr)); 377 } 378 return res; 379} 380 381INTERCEPTOR(long double, strtold, const char *nptr, char **endptr) { // NOLINT 382 ENSURE_MSAN_INITED(); 383 long double res = REAL(strtold)(nptr, endptr); // NOLINT 384 if (!__msan_has_dynamic_component()) { 385 __msan_unpoison(endptr, sizeof(*endptr)); 386 } 387 return res; 388} 389 390INTERCEPTOR(long double, strtold_l, const char *nptr, char **endptr, 391 void *loc) { // NOLINT 392 ENSURE_MSAN_INITED(); 393 long double res = REAL(strtold_l)(nptr, endptr, loc); // NOLINT 394 if (!__msan_has_dynamic_component()) { 395 __msan_unpoison(endptr, sizeof(*endptr)); 396 } 397 return res; 398} 399 400INTERCEPTOR(long double, __strtold_l, const char *nptr, char **endptr, 401 void *loc) { // NOLINT 402 ENSURE_MSAN_INITED(); 403 long double res = REAL(__strtold_l)(nptr, endptr, loc); // NOLINT 404 if (!__msan_has_dynamic_component()) { 405 __msan_unpoison(endptr, sizeof(*endptr)); 406 } 407 return res; 408} 409 410INTERCEPTOR(int, vasprintf, char **strp, const char *format, va_list ap) { 411 ENSURE_MSAN_INITED(); 412 int res = REAL(vasprintf)(strp, format, ap); 413 if (res >= 0 && !__msan_has_dynamic_component()) { 414 __msan_unpoison(strp, sizeof(*strp)); 415 __msan_unpoison(*strp, res + 1); 416 } 417 return res; 418} 419 420INTERCEPTOR(int, asprintf, char **strp, const char *format, ...) { // NOLINT 421 ENSURE_MSAN_INITED(); 422 va_list ap; 423 va_start(ap, format); 424 int res = vasprintf(strp, format, ap); // NOLINT 425 va_end(ap); 426 return res; 427} 428 429INTERCEPTOR(int, vsnprintf, char *str, uptr size, 430 const char *format, va_list ap) { 431 ENSURE_MSAN_INITED(); 432 int res = REAL(vsnprintf)(str, size, format, ap); 433 if (res >= 0 && !__msan_has_dynamic_component()) { 434 __msan_unpoison(str, res + 1); 435 } 436 return res; 437} 438 439INTERCEPTOR(int, vsprintf, char *str, const char *format, va_list ap) { 440 ENSURE_MSAN_INITED(); 441 int res = REAL(vsprintf)(str, format, ap); 442 if (res >= 0 && !__msan_has_dynamic_component()) { 443 __msan_unpoison(str, res + 1); 444 } 445 return res; 446} 447 448INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) { 449 ENSURE_MSAN_INITED(); 450 int res = REAL(vswprintf)(str, size, format, ap); 451 if (res >= 0 && !__msan_has_dynamic_component()) { 452 __msan_unpoison(str, 4 * (res + 1)); 453 } 454 return res; 455} 456 457INTERCEPTOR(int, sprintf, char *str, const char *format, ...) { // NOLINT 458 ENSURE_MSAN_INITED(); 459 va_list ap; 460 va_start(ap, format); 461 int res = vsprintf(str, format, ap); // NOLINT 462 va_end(ap); 463 return res; 464} 465 466INTERCEPTOR(int, snprintf, char *str, uptr size, const char *format, ...) { 467 ENSURE_MSAN_INITED(); 468 va_list ap; 469 va_start(ap, format); 470 int res = vsnprintf(str, size, format, ap); 471 va_end(ap); 472 return res; 473} 474 475INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) { 476 ENSURE_MSAN_INITED(); 477 va_list ap; 478 va_start(ap, format); 479 int res = vswprintf(str, size, format, ap); 480 va_end(ap); 481 return res; 482} 483 484// SIZE_T strftime(char *s, SIZE_T max, const char *format,const struct tm *tm); 485INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format, 486 void *tm) { 487 ENSURE_MSAN_INITED(); 488 SIZE_T res = REAL(strftime)(s, max, format, tm); 489 if (res) __msan_unpoison(s, res + 1); 490 return res; 491} 492 493INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) { 494 ENSURE_MSAN_INITED(); 495 int res = REAL(mbtowc)(dest, src, n); 496 if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t)); 497 return res; 498} 499 500INTERCEPTOR(int, mbrtowc, wchar_t *dest, const char *src, SIZE_T n, void *ps) { 501 ENSURE_MSAN_INITED(); 502 SIZE_T res = REAL(mbrtowc)(dest, src, n, ps); 503 if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t)); 504 return res; 505} 506 507INTERCEPTOR(SIZE_T, wcslen, const wchar_t *s) { 508 ENSURE_MSAN_INITED(); 509 SIZE_T res = REAL(wcslen)(s); 510 CHECK_UNPOISONED(s, sizeof(wchar_t) * (res + 1)); 511 return res; 512} 513 514// wchar_t *wcschr(const wchar_t *wcs, wchar_t wc); 515INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) { 516 ENSURE_MSAN_INITED(); 517 wchar_t *res = REAL(wcschr)(s, wc, ps); 518 return res; 519} 520 521// wchar_t *wcscpy(wchar_t *dest, const wchar_t *src); 522INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) { 523 ENSURE_MSAN_INITED(); 524 wchar_t *res = REAL(wcscpy)(dest, src); 525 __msan_copy_poison(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1)); 526 return res; 527} 528 529// wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n); 530INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) { 531 ENSURE_MSAN_INITED(); 532 wchar_t *res = REAL(wmemcpy)(dest, src, n); 533 __msan_copy_poison(dest, src, n * sizeof(wchar_t)); 534 return res; 535} 536 537INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) { 538 ENSURE_MSAN_INITED(); 539 wchar_t *res = REAL(wmempcpy)(dest, src, n); 540 __msan_copy_poison(dest, src, n * sizeof(wchar_t)); 541 return res; 542} 543 544INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) { 545 CHECK(MEM_IS_APP(s)); 546 ENSURE_MSAN_INITED(); 547 wchar_t *res = (wchar_t *)fast_memset(s, c, n * sizeof(wchar_t)); 548 __msan_unpoison(s, n * sizeof(wchar_t)); 549 return res; 550} 551 552INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) { 553 ENSURE_MSAN_INITED(); 554 wchar_t *res = REAL(wmemmove)(dest, src, n); 555 __msan_move_poison(dest, src, n * sizeof(wchar_t)); 556 return res; 557} 558 559INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) { 560 ENSURE_MSAN_INITED(); 561 int res = REAL(wcscmp)(s1, s2); 562 return res; 563} 564 565INTERCEPTOR(double, wcstod, const wchar_t *nptr, wchar_t **endptr) { 566 ENSURE_MSAN_INITED(); 567 double res = REAL(wcstod)(nptr, endptr); 568 __msan_unpoison(endptr, sizeof(*endptr)); 569 return res; 570} 571 572// #define UNSUPPORTED(name) \ 573// INTERCEPTOR(void, name, void) { \ 574// Printf("MSAN: Unsupported %s\n", __FUNCTION__); \ 575// Die(); \ 576// } 577 578// FIXME: intercept the following functions: 579// Note, they only matter when running without a dynamic tool. 580// UNSUPPORTED(wcscoll_l) 581// UNSUPPORTED(wcsnrtombs) 582// UNSUPPORTED(wcstol) 583// UNSUPPORTED(wcstoll) 584// UNSUPPORTED(wcstold) 585// UNSUPPORTED(wcstoul) 586// UNSUPPORTED(wcstoull) 587// UNSUPPORTED(wcsxfrm_l) 588// UNSUPPORTED(wcsdup) 589// UNSUPPORTED(wcsftime) 590// UNSUPPORTED(wcsstr) 591// UNSUPPORTED(wcsrchr) 592// UNSUPPORTED(wctob) 593 594INTERCEPTOR(int, gettimeofday, void *tv, void *tz) { 595 ENSURE_MSAN_INITED(); 596 int res = REAL(gettimeofday)(tv, tz); 597 if (tv) 598 __msan_unpoison(tv, 16); 599 if (tz) 600 __msan_unpoison(tz, 8); 601 return res; 602} 603 604INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) { 605 ENSURE_MSAN_INITED(); 606 char *res = REAL(fcvt)(x, a, b, c); 607 if (!__msan_has_dynamic_component()) { 608 __msan_unpoison(b, sizeof(*b)); 609 __msan_unpoison(c, sizeof(*c)); 610 } 611 return res; 612} 613 614INTERCEPTOR(char *, getenv, char *name) { 615 ENSURE_MSAN_INITED(); 616 char *res = REAL(getenv)(name); 617 if (!__msan_has_dynamic_component()) { 618 if (res) 619 __msan_unpoison(res, REAL(strlen)(res) + 1); 620 } 621 return res; 622} 623 624extern char **environ; 625 626static void UnpoisonEnviron() { 627 char **envp = environ; 628 for (; *envp; ++envp) { 629 __msan_unpoison(envp, sizeof(*envp)); 630 __msan_unpoison(*envp, REAL(strlen)(*envp) + 1); 631 } 632 // Trailing NULL pointer. 633 __msan_unpoison(envp, sizeof(*envp)); 634} 635 636INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) { 637 ENSURE_MSAN_INITED(); 638 int res = REAL(setenv)(name, value, overwrite); 639 if (!res) UnpoisonEnviron(); 640 return res; 641} 642 643INTERCEPTOR(int, putenv, char *string) { 644 ENSURE_MSAN_INITED(); 645 int res = REAL(putenv)(string); 646 if (!res) UnpoisonEnviron(); 647 return res; 648} 649 650INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) { 651 ENSURE_MSAN_INITED(); 652 int res = REAL(__fxstat)(magic, fd, buf); 653 if (!res) 654 __msan_unpoison(buf, __sanitizer::struct_stat_sz); 655 return res; 656} 657 658INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) { 659 ENSURE_MSAN_INITED(); 660 int res = REAL(__fxstat64)(magic, fd, buf); 661 if (!res) 662 __msan_unpoison(buf, __sanitizer::struct_stat64_sz); 663 return res; 664} 665 666INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf, 667 int flags) { 668 ENSURE_MSAN_INITED(); 669 int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags); 670 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz); 671 return res; 672} 673 674INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf, 675 int flags) { 676 ENSURE_MSAN_INITED(); 677 int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags); 678 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz); 679 return res; 680} 681 682INTERCEPTOR(int, __xstat, int magic, char *path, void *buf) { 683 ENSURE_MSAN_INITED(); 684 int res = REAL(__xstat)(magic, path, buf); 685 if (!res) 686 __msan_unpoison(buf, __sanitizer::struct_stat_sz); 687 return res; 688} 689 690INTERCEPTOR(int, __xstat64, int magic, char *path, void *buf) { 691 ENSURE_MSAN_INITED(); 692 int res = REAL(__xstat64)(magic, path, buf); 693 if (!res) 694 __msan_unpoison(buf, __sanitizer::struct_stat64_sz); 695 return res; 696} 697 698INTERCEPTOR(int, __lxstat, int magic, char *path, void *buf) { 699 ENSURE_MSAN_INITED(); 700 int res = REAL(__lxstat)(magic, path, buf); 701 if (!res) 702 __msan_unpoison(buf, __sanitizer::struct_stat_sz); 703 return res; 704} 705 706INTERCEPTOR(int, __lxstat64, int magic, char *path, void *buf) { 707 ENSURE_MSAN_INITED(); 708 int res = REAL(__lxstat64)(magic, path, buf); 709 if (!res) 710 __msan_unpoison(buf, __sanitizer::struct_stat64_sz); 711 return res; 712} 713 714INTERCEPTOR(int, pipe, int pipefd[2]) { 715 if (msan_init_is_running) 716 return REAL(pipe)(pipefd); 717 ENSURE_MSAN_INITED(); 718 int res = REAL(pipe)(pipefd); 719 if (!res) 720 __msan_unpoison(pipefd, sizeof(int[2])); 721 return res; 722} 723 724INTERCEPTOR(int, pipe2, int pipefd[2], int flags) { 725 ENSURE_MSAN_INITED(); 726 int res = REAL(pipe2)(pipefd, flags); 727 if (!res) 728 __msan_unpoison(pipefd, sizeof(int[2])); 729 return res; 730} 731 732INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) { 733 ENSURE_MSAN_INITED(); 734 int res = REAL(socketpair)(domain, type, protocol, sv); 735 if (!res) 736 __msan_unpoison(sv, sizeof(int[2])); 737 return res; 738} 739 740INTERCEPTOR(char *, fgets, char *s, int size, void *stream) { 741 ENSURE_MSAN_INITED(); 742 char *res = REAL(fgets)(s, size, stream); 743 if (res) 744 __msan_unpoison(s, REAL(strlen)(s) + 1); 745 return res; 746} 747 748INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) { 749 ENSURE_MSAN_INITED(); 750 char *res = REAL(fgets_unlocked)(s, size, stream); 751 if (res) 752 __msan_unpoison(s, REAL(strlen)(s) + 1); 753 return res; 754} 755 756INTERCEPTOR(int, getrlimit, int resource, void *rlim) { 757 if (msan_init_is_running) 758 return REAL(getrlimit)(resource, rlim); 759 ENSURE_MSAN_INITED(); 760 int res = REAL(getrlimit)(resource, rlim); 761 if (!res) 762 __msan_unpoison(rlim, __sanitizer::struct_rlimit_sz); 763 return res; 764} 765 766INTERCEPTOR(int, getrlimit64, int resource, void *rlim) { 767 if (msan_init_is_running) 768 return REAL(getrlimit64)(resource, rlim); 769 ENSURE_MSAN_INITED(); 770 int res = REAL(getrlimit64)(resource, rlim); 771 if (!res) 772 __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz); 773 return res; 774} 775 776INTERCEPTOR(int, statfs, const char *s, void *buf) { 777 ENSURE_MSAN_INITED(); 778 int res = REAL(statfs)(s, buf); 779 if (!res) 780 __msan_unpoison(buf, __sanitizer::struct_statfs_sz); 781 return res; 782} 783 784INTERCEPTOR(int, fstatfs, int fd, void *buf) { 785 ENSURE_MSAN_INITED(); 786 int res = REAL(fstatfs)(fd, buf); 787 if (!res) 788 __msan_unpoison(buf, __sanitizer::struct_statfs_sz); 789 return res; 790} 791 792INTERCEPTOR(int, statfs64, const char *s, void *buf) { 793 ENSURE_MSAN_INITED(); 794 int res = REAL(statfs64)(s, buf); 795 if (!res) 796 __msan_unpoison(buf, __sanitizer::struct_statfs64_sz); 797 return res; 798} 799 800INTERCEPTOR(int, fstatfs64, int fd, void *buf) { 801 ENSURE_MSAN_INITED(); 802 int res = REAL(fstatfs64)(fd, buf); 803 if (!res) 804 __msan_unpoison(buf, __sanitizer::struct_statfs64_sz); 805 return res; 806} 807 808INTERCEPTOR(int, uname, void *utsname) { 809 ENSURE_MSAN_INITED(); 810 int res = REAL(uname)(utsname); 811 if (!res) { 812 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz); 813 } 814 return res; 815} 816 817INTERCEPTOR(int, gethostname, char *name, SIZE_T len) { 818 ENSURE_MSAN_INITED(); 819 int res = REAL(gethostname)(name, len); 820 if (!res) { 821 SIZE_T real_len = REAL(strnlen)(name, len); 822 if (real_len < len) 823 ++real_len; 824 __msan_unpoison(name, real_len); 825 } 826 return res; 827} 828 829INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents, 830 int timeout) { 831 ENSURE_MSAN_INITED(); 832 int res = REAL(epoll_wait)(epfd, events, maxevents, timeout); 833 if (res > 0) { 834 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res); 835 } 836 return res; 837} 838 839INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents, 840 int timeout, void *sigmask) { 841 ENSURE_MSAN_INITED(); 842 int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask); 843 if (res > 0) { 844 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res); 845 } 846 return res; 847} 848 849INTERCEPTOR(SSIZE_T, recv, int fd, void *buf, SIZE_T len, int flags) { 850 ENSURE_MSAN_INITED(); 851 SSIZE_T res = REAL(recv)(fd, buf, len, flags); 852 if (res > 0) 853 __msan_unpoison(buf, res); 854 return res; 855} 856 857INTERCEPTOR(SSIZE_T, recvfrom, int fd, void *buf, SIZE_T len, int flags, 858 void *srcaddr, int *addrlen) { 859 ENSURE_MSAN_INITED(); 860 SIZE_T srcaddr_sz; 861 if (srcaddr) srcaddr_sz = *addrlen; 862 SSIZE_T res = REAL(recvfrom)(fd, buf, len, flags, srcaddr, addrlen); 863 if (res > 0) { 864 __msan_unpoison(buf, res); 865 if (srcaddr) { 866 SIZE_T sz = *addrlen; 867 __msan_unpoison(srcaddr, (sz < srcaddr_sz) ? sz : srcaddr_sz); 868 } 869 } 870 return res; 871} 872 873INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) { 874 if (CallocShouldReturnNullDueToOverflow(size, nmemb)) 875 return AllocatorReturnNull(); 876 GET_MALLOC_STACK_TRACE; 877 if (!msan_inited) { 878 // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym. 879 const SIZE_T kCallocPoolSize = 1024; 880 static uptr calloc_memory_for_dlsym[kCallocPoolSize]; 881 static SIZE_T allocated; 882 SIZE_T size_in_words = ((nmemb * size) + kWordSize - 1) / kWordSize; 883 void *mem = (void*)&calloc_memory_for_dlsym[allocated]; 884 allocated += size_in_words; 885 CHECK(allocated < kCallocPoolSize); 886 return mem; 887 } 888 return MsanReallocate(&stack, 0, nmemb * size, sizeof(u64), true); 889} 890 891INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) { 892 GET_MALLOC_STACK_TRACE; 893 return MsanReallocate(&stack, ptr, size, sizeof(u64), false); 894} 895 896INTERCEPTOR(void *, malloc, SIZE_T size) { 897 GET_MALLOC_STACK_TRACE; 898 return MsanReallocate(&stack, 0, size, sizeof(u64), false); 899} 900 901void __msan_allocated_memory(const void* data, uptr size) { 902 GET_MALLOC_STACK_TRACE; 903 if (flags()->poison_in_malloc) 904 __msan_poison(data, size); 905 if (__msan_get_track_origins()) { 906 u32 stack_id = StackDepotPut(stack.trace, stack.size); 907 CHECK(stack_id); 908 CHECK_EQ((stack_id >> 31), 0); // Higher bit is occupied by stack origins. 909 __msan_set_origin(data, size, stack_id); 910 } 911} 912 913INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags, 914 int fd, OFF_T offset) { 915 ENSURE_MSAN_INITED(); 916 void *res = REAL(mmap)(addr, length, prot, flags, fd, offset); 917 if (res != (void*)-1) 918 __msan_unpoison(res, RoundUpTo(length, GetPageSize())); 919 return res; 920} 921 922INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags, 923 int fd, OFF64_T offset) { 924 ENSURE_MSAN_INITED(); 925 void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset); 926 if (res != (void*)-1) 927 __msan_unpoison(res, RoundUpTo(length, GetPageSize())); 928 return res; 929} 930 931struct dlinfo { 932 char *dli_fname; 933 void *dli_fbase; 934 char *dli_sname; 935 void *dli_saddr; 936}; 937 938INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) { 939 ENSURE_MSAN_INITED(); 940 int res = REAL(dladdr)(addr, info); 941 if (res != 0) { 942 __msan_unpoison(info, sizeof(*info)); 943 if (info->dli_fname) 944 __msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1); 945 if (info->dli_sname) 946 __msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1); 947 } 948 return res; 949} 950 951// dlopen() ultimately calls mmap() down inside the loader, which generally 952// doesn't participate in dynamic symbol resolution. Therefore we won't 953// intercept its calls to mmap, and we have to hook it here. The loader 954// initializes the module before returning, so without the dynamic component, we 955// won't be able to clear the shadow before the initializers. Fixing this would 956// require putting our own initializer first to clear the shadow. 957INTERCEPTOR(void *, dlopen, const char *filename, int flag) { 958 ENSURE_MSAN_INITED(); 959 EnterLoader(); 960 link_map *map = (link_map *)REAL(dlopen)(filename, flag); 961 ExitLoader(); 962 if (!__msan_has_dynamic_component() && map) { 963 // If msandr didn't clear the shadow before the initializers ran, we do it 964 // ourselves afterwards. 965 ForEachMappedRegion(map, __msan_unpoison); 966 } 967 return (void *)map; 968} 969 970typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size, 971 void *data); 972struct dl_iterate_phdr_data { 973 dl_iterate_phdr_cb callback; 974 void *data; 975}; 976 977static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size, 978 void *data) { 979 if (info) { 980 __msan_unpoison(info, size); 981 if (info->dlpi_name) 982 __msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1); 983 } 984 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data; 985 UnpoisonParam(3); 986 return cbdata->callback(info, size, cbdata->data); 987} 988 989INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) { 990 ENSURE_MSAN_INITED(); 991 EnterLoader(); 992 dl_iterate_phdr_data cbdata; 993 cbdata.callback = callback; 994 cbdata.data = data; 995 int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata); 996 ExitLoader(); 997 return res; 998} 999 1000INTERCEPTOR(int, getrusage, int who, void *usage) { 1001 ENSURE_MSAN_INITED(); 1002 int res = REAL(getrusage)(who, usage); 1003 if (res == 0) { 1004 __msan_unpoison(usage, __sanitizer::struct_rusage_sz); 1005 } 1006 return res; 1007} 1008 1009// sigactions_mu guarantees atomicity of sigaction() and signal() calls. 1010// Access to sigactions[] is gone with relaxed atomics to avoid data race with 1011// the signal handler. 1012const int kMaxSignals = 1024; 1013static atomic_uintptr_t sigactions[kMaxSignals]; 1014static StaticSpinMutex sigactions_mu; 1015 1016static void SignalHandler(int signo) { 1017 ScopedThreadLocalStateBackup stlsb; 1018 UnpoisonParam(1); 1019 1020 typedef void (*signal_cb)(int x); 1021 signal_cb cb = 1022 (signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed); 1023 cb(signo); 1024} 1025 1026static void SignalAction(int signo, void *si, void *uc) { 1027 ScopedThreadLocalStateBackup stlsb; 1028 UnpoisonParam(3); 1029 __msan_unpoison(si, sizeof(__sanitizer_sigaction)); 1030 __msan_unpoison(uc, __sanitizer::ucontext_t_sz); 1031 1032 typedef void (*sigaction_cb)(int, void *, void *); 1033 sigaction_cb cb = 1034 (sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed); 1035 cb(signo, si, uc); 1036} 1037 1038INTERCEPTOR(int, sigaction, int signo, const __sanitizer_sigaction *act, 1039 __sanitizer_sigaction *oldact) { 1040 ENSURE_MSAN_INITED(); 1041 // FIXME: check that *act is unpoisoned. 1042 // That requires intercepting all of sigemptyset, sigfillset, etc. 1043 int res; 1044 if (flags()->wrap_signals) { 1045 SpinMutexLock lock(&sigactions_mu); 1046 CHECK_LT(signo, kMaxSignals); 1047 uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed); 1048 __sanitizer_sigaction new_act; 1049 __sanitizer_sigaction *pnew_act = act ? &new_act : 0; 1050 if (act) { 1051 internal_memcpy(pnew_act, act, sizeof(__sanitizer_sigaction)); 1052 uptr cb = (uptr)pnew_act->sa_sigaction; 1053 uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo) 1054 ? (uptr)SignalAction 1055 : (uptr)SignalHandler; 1056 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) { 1057 atomic_store(&sigactions[signo], cb, memory_order_relaxed); 1058 pnew_act->sa_sigaction = (void (*)(int, void *, void *))new_cb; 1059 } 1060 } 1061 res = REAL(sigaction)(signo, pnew_act, oldact); 1062 if (res == 0 && oldact) { 1063 uptr cb = (uptr)oldact->sa_sigaction; 1064 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) { 1065 oldact->sa_sigaction = (void (*)(int, void *, void *))old_cb; 1066 } 1067 } 1068 } else { 1069 res = REAL(sigaction)(signo, act, oldact); 1070 } 1071 1072 if (res == 0 && oldact) { 1073 __msan_unpoison(oldact, sizeof(__sanitizer_sigaction)); 1074 } 1075 return res; 1076} 1077 1078INTERCEPTOR(int, signal, int signo, uptr cb) { 1079 ENSURE_MSAN_INITED(); 1080 if (flags()->wrap_signals) { 1081 CHECK_LT(signo, kMaxSignals); 1082 SpinMutexLock lock(&sigactions_mu); 1083 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) { 1084 atomic_store(&sigactions[signo], cb, memory_order_relaxed); 1085 cb = (uptr) SignalHandler; 1086 } 1087 return REAL(signal)(signo, cb); 1088 } else { 1089 return REAL(signal)(signo, cb); 1090 } 1091} 1092 1093extern "C" int pthread_attr_init(void *attr); 1094extern "C" int pthread_attr_destroy(void *attr); 1095extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize); 1096extern "C" int pthread_attr_getstack(void *attr, uptr *stack, uptr *stacksize); 1097 1098INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*), 1099 void * param) { 1100 ENSURE_MSAN_INITED(); // for GetTlsSize() 1101 __sanitizer_pthread_attr_t myattr; 1102 if (attr == 0) { 1103 pthread_attr_init(&myattr); 1104 attr = &myattr; 1105 } 1106 1107 AdjustStackSizeLinux(attr, flags()->verbosity); 1108 1109 int res = REAL(pthread_create)(th, attr, callback, param); 1110 if (attr == &myattr) 1111 pthread_attr_destroy(&myattr); 1112 if (!res) { 1113 __msan_unpoison(th, __sanitizer::pthread_t_sz); 1114 } 1115 return res; 1116} 1117 1118INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key, 1119 void (*dtor)(void *value)) { 1120 ENSURE_MSAN_INITED(); 1121 int res = REAL(pthread_key_create)(key, dtor); 1122 if (!res && key) 1123 __msan_unpoison(key, sizeof(*key)); 1124 return res; 1125} 1126 1127INTERCEPTOR(int, pthread_join, void *th, void **retval) { 1128 ENSURE_MSAN_INITED(); 1129 int res = REAL(pthread_join)(th, retval); 1130 if (!res && retval) 1131 __msan_unpoison(retval, sizeof(*retval)); 1132 return res; 1133} 1134 1135extern char *tzname[2]; 1136 1137INTERCEPTOR(void, tzset) { 1138 ENSURE_MSAN_INITED(); 1139 REAL(tzset)(); 1140 if (tzname[0]) 1141 __msan_unpoison(tzname[0], REAL(strlen)(tzname[0]) + 1); 1142 if (tzname[1]) 1143 __msan_unpoison(tzname[1], REAL(strlen)(tzname[1]) + 1); 1144 return; 1145} 1146 1147struct MSanAtExitRecord { 1148 void (*func)(void *arg); 1149 void *arg; 1150}; 1151 1152void MSanAtExitWrapper(void *arg) { 1153 UnpoisonParam(1); 1154 MSanAtExitRecord *r = (MSanAtExitRecord *)arg; 1155 r->func(r->arg); 1156 InternalFree(r); 1157} 1158 1159// Unpoison argument shadow for C++ module destructors. 1160INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg, 1161 void *dso_handle) { 1162 if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle); 1163 ENSURE_MSAN_INITED(); 1164 MSanAtExitRecord *r = 1165 (MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord)); 1166 r->func = func; 1167 r->arg = arg; 1168 return REAL(__cxa_atexit)(MSanAtExitWrapper, r, dso_handle); 1169} 1170 1171struct MSanInterceptorContext { 1172 bool in_interceptor_scope; 1173}; 1174 1175namespace __msan { 1176 1177int OnExit() { 1178 // FIXME: ask frontend whether we need to return failure. 1179 return 0; 1180} 1181 1182} // namespace __msan 1183 1184// A version of CHECK_UNPOISED using a saved scope value. Used in common 1185// interceptors. 1186#define CHECK_UNPOISONED_CTX(ctx, x, n) \ 1187 do { \ 1188 if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \ 1189 CHECK_UNPOISONED_0(x, n); \ 1190 } while (0) 1191 1192#define COMMON_INTERCEPTOR_UNPOISON_PARAM(ctx, count) \ 1193 UnpoisonParam(count) 1194#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \ 1195 __msan_unpoison(ptr, size) 1196#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \ 1197 CHECK_UNPOISONED_CTX(ctx, ptr, size) 1198#define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ctx, ptr, size) \ 1199 __msan_unpoison(ptr, size) 1200#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \ 1201 if (msan_init_is_running) return REAL(func)(__VA_ARGS__); \ 1202 MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \ 1203 ctx = (void *)&msan_ctx; \ 1204 (void)ctx; \ 1205 InterceptorScope interceptor_scope; \ 1206 ENSURE_MSAN_INITED(); 1207#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \ 1208 do { \ 1209 } while (false) 1210#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \ 1211 do { \ 1212 } while (false) 1213#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \ 1214 do { \ 1215 } while (false) 1216#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \ 1217 do { \ 1218 } while (false) // FIXME 1219#define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name) 1220#define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit() 1221#include "sanitizer_common/sanitizer_common_interceptors.inc" 1222 1223#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s) 1224#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \ 1225 do { \ 1226 } while (false) 1227#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \ 1228 do { \ 1229 } while (false) 1230#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s) 1231#include "sanitizer_common/sanitizer_common_syscalls.inc" 1232 1233// static 1234void *fast_memset(void *ptr, int c, SIZE_T n) { 1235 // hack until we have a really fast internal_memset 1236 if (sizeof(uptr) == 8 && 1237 (n % 8) == 0 && 1238 ((uptr)ptr % 8) == 0 && 1239 (c == 0 || c == -1)) { 1240 // Printf("memset %p %zd %x\n", ptr, n, c); 1241 uptr to_store = c ? -1L : 0L; 1242 uptr *p = (uptr*)ptr; 1243 for (SIZE_T i = 0; i < n / 8; i++) 1244 p[i] = to_store; 1245 return ptr; 1246 } 1247 return internal_memset(ptr, c, n); 1248} 1249 1250// static 1251void *fast_memcpy(void *dst, const void *src, SIZE_T n) { 1252 // Same hack as in fast_memset above. 1253 if (sizeof(uptr) == 8 && 1254 (n % 8) == 0 && 1255 ((uptr)dst % 8) == 0 && 1256 ((uptr)src % 8) == 0) { 1257 uptr *d = (uptr*)dst; 1258 uptr *s = (uptr*)src; 1259 for (SIZE_T i = 0; i < n / 8; i++) 1260 d[i] = s[i]; 1261 return dst; 1262 } 1263 return internal_memcpy(dst, src, n); 1264} 1265 1266// These interface functions reside here so that they can use 1267// fast_memset, etc. 1268void __msan_unpoison(const void *a, uptr size) { 1269 if (!MEM_IS_APP(a)) return; 1270 fast_memset((void*)MEM_TO_SHADOW((uptr)a), 0, size); 1271} 1272 1273void __msan_poison(const void *a, uptr size) { 1274 if (!MEM_IS_APP(a)) return; 1275 fast_memset((void*)MEM_TO_SHADOW((uptr)a), 1276 __msan::flags()->poison_heap_with_zeroes ? 0 : -1, size); 1277} 1278 1279void __msan_poison_stack(void *a, uptr size) { 1280 if (!MEM_IS_APP(a)) return; 1281 fast_memset((void*)MEM_TO_SHADOW((uptr)a), 1282 __msan::flags()->poison_stack_with_zeroes ? 0 : -1, size); 1283} 1284 1285void __msan_clear_and_unpoison(void *a, uptr size) { 1286 fast_memset(a, 0, size); 1287 fast_memset((void*)MEM_TO_SHADOW((uptr)a), 0, size); 1288} 1289 1290void __msan_copy_origin(void *dst, const void *src, uptr size) { 1291 if (!__msan_get_track_origins()) return; 1292 if (!MEM_IS_APP(dst) || !MEM_IS_APP(src)) return; 1293 uptr d = MEM_TO_ORIGIN(dst); 1294 uptr s = MEM_TO_ORIGIN(src); 1295 uptr beg = d & ~3UL; // align down. 1296 uptr end = (d + size + 3) & ~3UL; // align up. 1297 s = s & ~3UL; // align down. 1298 fast_memcpy((void*)beg, (void*)s, end - beg); 1299} 1300 1301void __msan_copy_poison(void *dst, const void *src, uptr size) { 1302 if (!MEM_IS_APP(dst)) return; 1303 if (!MEM_IS_APP(src)) return; 1304 fast_memcpy((void*)MEM_TO_SHADOW((uptr)dst), 1305 (void*)MEM_TO_SHADOW((uptr)src), size); 1306 __msan_copy_origin(dst, src, size); 1307} 1308 1309void __msan_move_poison(void *dst, const void *src, uptr size) { 1310 if (!MEM_IS_APP(dst)) return; 1311 if (!MEM_IS_APP(src)) return; 1312 internal_memmove((void*)MEM_TO_SHADOW((uptr)dst), 1313 (void*)MEM_TO_SHADOW((uptr)src), size); 1314 __msan_copy_origin(dst, src, size); 1315} 1316 1317void *__msan_memcpy(void *dest, const void *src, SIZE_T n) { 1318 ENSURE_MSAN_INITED(); 1319 void *res = fast_memcpy(dest, src, n); 1320 __msan_copy_poison(dest, src, n); 1321 return res; 1322} 1323 1324void *__msan_memset(void *s, int c, SIZE_T n) { 1325 ENSURE_MSAN_INITED(); 1326 void *res = fast_memset(s, c, n); 1327 __msan_unpoison(s, n); 1328 return res; 1329} 1330 1331void *__msan_memmove(void *dest, const void *src, SIZE_T n) { 1332 ENSURE_MSAN_INITED(); 1333 void *res = REAL(memmove)(dest, src, n); 1334 __msan_move_poison(dest, src, n); 1335 return res; 1336} 1337 1338namespace __msan { 1339void InitializeInterceptors() { 1340 static int inited = 0; 1341 CHECK_EQ(inited, 0); 1342 SANITIZER_COMMON_INTERCEPTORS_INIT; 1343 1344 INTERCEPT_FUNCTION(mmap); 1345 INTERCEPT_FUNCTION(mmap64); 1346 INTERCEPT_FUNCTION(posix_memalign); 1347 INTERCEPT_FUNCTION(memalign); 1348 INTERCEPT_FUNCTION(valloc); 1349 INTERCEPT_FUNCTION(pvalloc); 1350 INTERCEPT_FUNCTION(malloc); 1351 INTERCEPT_FUNCTION(calloc); 1352 INTERCEPT_FUNCTION(realloc); 1353 INTERCEPT_FUNCTION(free); 1354 INTERCEPT_FUNCTION(fread); 1355 INTERCEPT_FUNCTION(fread_unlocked); 1356 INTERCEPT_FUNCTION(readlink); 1357 INTERCEPT_FUNCTION(memcpy); 1358 INTERCEPT_FUNCTION(mempcpy); 1359 INTERCEPT_FUNCTION(memset); 1360 INTERCEPT_FUNCTION(memmove); 1361 INTERCEPT_FUNCTION(bcopy); 1362 INTERCEPT_FUNCTION(wmemset); 1363 INTERCEPT_FUNCTION(wmemcpy); 1364 INTERCEPT_FUNCTION(wmempcpy); 1365 INTERCEPT_FUNCTION(wmemmove); 1366 INTERCEPT_FUNCTION(strcpy); // NOLINT 1367 INTERCEPT_FUNCTION(stpcpy); // NOLINT 1368 INTERCEPT_FUNCTION(strdup); 1369 INTERCEPT_FUNCTION(__strdup); 1370 INTERCEPT_FUNCTION(strndup); 1371 INTERCEPT_FUNCTION(__strndup); 1372 INTERCEPT_FUNCTION(strncpy); // NOLINT 1373 INTERCEPT_FUNCTION(strlen); 1374 INTERCEPT_FUNCTION(strnlen); 1375 INTERCEPT_FUNCTION(gcvt); 1376 INTERCEPT_FUNCTION(strcat); // NOLINT 1377 INTERCEPT_FUNCTION(strncat); // NOLINT 1378 INTERCEPT_FUNCTION(strtol); 1379 INTERCEPT_FUNCTION(strtoll); 1380 INTERCEPT_FUNCTION(strtoul); 1381 INTERCEPT_FUNCTION(strtoull); 1382 INTERCEPT_FUNCTION(strtod); 1383 INTERCEPT_FUNCTION(strtod_l); 1384 INTERCEPT_FUNCTION(__strtod_l); 1385 INTERCEPT_FUNCTION(strtof); 1386 INTERCEPT_FUNCTION(strtof_l); 1387 INTERCEPT_FUNCTION(__strtof_l); 1388 INTERCEPT_FUNCTION(strtold); 1389 INTERCEPT_FUNCTION(strtold_l); 1390 INTERCEPT_FUNCTION(__strtold_l); 1391 INTERCEPT_FUNCTION(vasprintf); 1392 INTERCEPT_FUNCTION(asprintf); 1393 INTERCEPT_FUNCTION(vsprintf); 1394 INTERCEPT_FUNCTION(vsnprintf); 1395 INTERCEPT_FUNCTION(vswprintf); 1396 INTERCEPT_FUNCTION(sprintf); // NOLINT 1397 INTERCEPT_FUNCTION(snprintf); 1398 INTERCEPT_FUNCTION(swprintf); 1399 INTERCEPT_FUNCTION(strftime); 1400 INTERCEPT_FUNCTION(mbtowc); 1401 INTERCEPT_FUNCTION(mbrtowc); 1402 INTERCEPT_FUNCTION(wcslen); 1403 INTERCEPT_FUNCTION(wcschr); 1404 INTERCEPT_FUNCTION(wcscpy); 1405 INTERCEPT_FUNCTION(wcscmp); 1406 INTERCEPT_FUNCTION(wcstod); 1407 INTERCEPT_FUNCTION(getenv); 1408 INTERCEPT_FUNCTION(setenv); 1409 INTERCEPT_FUNCTION(putenv); 1410 INTERCEPT_FUNCTION(gettimeofday); 1411 INTERCEPT_FUNCTION(fcvt); 1412 INTERCEPT_FUNCTION(__fxstat); 1413 INTERCEPT_FUNCTION(__fxstatat); 1414 INTERCEPT_FUNCTION(__xstat); 1415 INTERCEPT_FUNCTION(__lxstat); 1416 INTERCEPT_FUNCTION(__fxstat64); 1417 INTERCEPT_FUNCTION(__fxstatat64); 1418 INTERCEPT_FUNCTION(__xstat64); 1419 INTERCEPT_FUNCTION(__lxstat64); 1420 INTERCEPT_FUNCTION(pipe); 1421 INTERCEPT_FUNCTION(pipe2); 1422 INTERCEPT_FUNCTION(socketpair); 1423 INTERCEPT_FUNCTION(fgets); 1424 INTERCEPT_FUNCTION(fgets_unlocked); 1425 INTERCEPT_FUNCTION(getrlimit); 1426 INTERCEPT_FUNCTION(getrlimit64); 1427 INTERCEPT_FUNCTION(statfs); 1428 INTERCEPT_FUNCTION(fstatfs); 1429 INTERCEPT_FUNCTION(statfs64); 1430 INTERCEPT_FUNCTION(fstatfs64); 1431 INTERCEPT_FUNCTION(uname); 1432 INTERCEPT_FUNCTION(gethostname); 1433 INTERCEPT_FUNCTION(epoll_wait); 1434 INTERCEPT_FUNCTION(epoll_pwait); 1435 INTERCEPT_FUNCTION(recv); 1436 INTERCEPT_FUNCTION(recvfrom); 1437 INTERCEPT_FUNCTION(dladdr); 1438 INTERCEPT_FUNCTION(dlopen); 1439 INTERCEPT_FUNCTION(dl_iterate_phdr); 1440 INTERCEPT_FUNCTION(getrusage); 1441 INTERCEPT_FUNCTION(sigaction); 1442 INTERCEPT_FUNCTION(signal); 1443 INTERCEPT_FUNCTION(pthread_create); 1444 INTERCEPT_FUNCTION(pthread_key_create); 1445 INTERCEPT_FUNCTION(pthread_join); 1446 INTERCEPT_FUNCTION(tzset); 1447 INTERCEPT_FUNCTION(__cxa_atexit); 1448 inited = 1; 1449} 1450} // namespace __msan 1451