1 //===-- sanitizer_linux.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 shared between AddressSanitizer and ThreadSanitizer 11 // run-time libraries and implements linux-specific functions from 12 // sanitizer_libc.h. 13 //===----------------------------------------------------------------------===// 14 15 #include "sanitizer_platform.h" 16 17 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \ 18 SANITIZER_OPENBSD || SANITIZER_SOLARIS 19 20 #include "sanitizer_common.h" 21 #include "sanitizer_flags.h" 22 #include "sanitizer_getauxval.h" 23 #include "sanitizer_internal_defs.h" 24 #include "sanitizer_libc.h" 25 #include "sanitizer_linux.h" 26 #include "sanitizer_mutex.h" 27 #include "sanitizer_placement_new.h" 28 #include "sanitizer_procmaps.h" 29 30 #if SANITIZER_LINUX 31 #include <asm/param.h> 32 #endif 33 34 // For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat' 35 // format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To 36 // access stat from asm/stat.h, without conflicting with definition in 37 // sys/stat.h, we use this trick. 38 #if defined(__mips64) 39 #include <asm/unistd.h> 40 #include <sys/types.h> 41 #define stat kernel_stat 42 #include <asm/stat.h> 43 #undef stat 44 #endif 45 46 #include <dlfcn.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <link.h> 50 #include <pthread.h> 51 #include <sched.h> 52 #include <signal.h> 53 #include <sys/mman.h> 54 #include <sys/param.h> 55 #if !SANITIZER_SOLARIS 56 #include <sys/ptrace.h> 57 #endif 58 #include <sys/resource.h> 59 #include <sys/stat.h> 60 #include <sys/syscall.h> 61 #include <sys/time.h> 62 #include <sys/types.h> 63 #if !SANITIZER_OPENBSD 64 #include <ucontext.h> 65 #endif 66 #if SANITIZER_OPENBSD 67 #include <sys/futex.h> 68 #include <sys/sysctl.h> 69 #endif 70 #include <unistd.h> 71 72 #if SANITIZER_LINUX 73 #include <sys/utsname.h> 74 #endif 75 76 #if SANITIZER_LINUX && !SANITIZER_ANDROID 77 #include <sys/personality.h> 78 #endif 79 80 #if SANITIZER_FREEBSD 81 #include <sys/exec.h> 82 #include <sys/sysctl.h> 83 #include <machine/atomic.h> 84 extern "C" { 85 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on 86 // FreeBSD 9.2 and 10.0. 87 #include <sys/umtx.h> 88 } 89 #include <sys/thr.h> 90 #endif // SANITIZER_FREEBSD 91 92 #if SANITIZER_NETBSD 93 #include <limits.h> // For NAME_MAX 94 #include <sys/sysctl.h> 95 #include <sys/exec.h> 96 extern struct ps_strings *__ps_strings; 97 #endif // SANITIZER_NETBSD 98 99 #if SANITIZER_SOLARIS 100 #include <stdlib.h> 101 #include <thread.h> 102 #define environ _environ 103 #endif 104 105 extern char **environ; 106 107 #if SANITIZER_LINUX 108 // <linux/time.h> 109 struct kernel_timeval { 110 long tv_sec; 111 long tv_usec; 112 }; 113 114 // <linux/futex.h> is broken on some linux distributions. 115 const int FUTEX_WAIT = 0; 116 const int FUTEX_WAKE = 1; 117 const int FUTEX_PRIVATE_FLAG = 128; 118 const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; 119 const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; 120 #endif // SANITIZER_LINUX 121 122 // Are we using 32-bit or 64-bit Linux syscalls? 123 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 124 // but it still needs to use 64-bit syscalls. 125 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \ 126 SANITIZER_WORDSIZE == 64) 127 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 128 #else 129 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 130 #endif 131 132 #if defined(__x86_64__) || SANITIZER_MIPS64 133 extern "C" { 134 extern void internal_sigreturn(); 135 } 136 #endif 137 138 // Note : FreeBSD had implemented both 139 // Linux and OpenBSD apis, available from 140 // future 12.x version most likely 141 #if SANITIZER_LINUX && defined(__NR_getrandom) 142 # if !defined(GRND_NONBLOCK) 143 # define GRND_NONBLOCK 1 144 # endif 145 # define SANITIZER_USE_GETRANDOM 1 146 #else 147 # define SANITIZER_USE_GETRANDOM 0 148 #endif // SANITIZER_LINUX && defined(__NR_getrandom) 149 150 #if SANITIZER_OPENBSD 151 # define SANITIZER_USE_GETENTROPY 1 152 #else 153 # if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000 154 # define SANITIZER_USE_GETENTROPY 1 155 # else 156 # define SANITIZER_USE_GETENTROPY 0 157 # endif 158 #endif // SANITIZER_USE_GETENTROPY 159 160 namespace __sanitizer { 161 162 #if SANITIZER_LINUX && defined(__x86_64__) 163 #include "sanitizer_syscall_linux_x86_64.inc" 164 #elif SANITIZER_LINUX && defined(__aarch64__) 165 #include "sanitizer_syscall_linux_aarch64.inc" 166 #elif SANITIZER_LINUX && defined(__arm__) 167 #include "sanitizer_syscall_linux_arm.inc" 168 #else 169 #include "sanitizer_syscall_generic.inc" 170 #endif 171 172 // --------------- sanitizer_libc.h 173 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 174 #if !SANITIZER_S390 && !SANITIZER_OPENBSD 175 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd, 176 OFF_T offset) { 177 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 178 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd, 179 offset); 180 #else 181 // mmap2 specifies file offset in 4096-byte units. 182 CHECK(IsAligned(offset, 4096)); 183 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd, 184 offset / 4096); 185 #endif 186 } 187 #endif // !SANITIZER_S390 && !SANITIZER_OPENBSD 188 189 #if !SANITIZER_OPENBSD 190 uptr internal_munmap(void *addr, uptr length) { 191 return internal_syscall(SYSCALL(munmap), (uptr)addr, length); 192 } 193 194 int internal_mprotect(void *addr, uptr length, int prot) { 195 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot); 196 } 197 #endif 198 199 uptr internal_close(fd_t fd) { 200 return internal_syscall(SYSCALL(close), fd); 201 } 202 203 uptr internal_open(const char *filename, int flags) { 204 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 205 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags); 206 #else 207 return internal_syscall(SYSCALL(open), (uptr)filename, flags); 208 #endif 209 } 210 211 uptr internal_open(const char *filename, int flags, u32 mode) { 212 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 213 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags, 214 mode); 215 #else 216 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode); 217 #endif 218 } 219 220 uptr internal_read(fd_t fd, void *buf, uptr count) { 221 sptr res; 222 HANDLE_EINTR(res, 223 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)); 224 return res; 225 } 226 227 uptr internal_write(fd_t fd, const void *buf, uptr count) { 228 sptr res; 229 HANDLE_EINTR(res, 230 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)); 231 return res; 232 } 233 234 uptr internal_ftruncate(fd_t fd, uptr size) { 235 sptr res; 236 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd, 237 (OFF_T)size)); 238 return res; 239 } 240 241 #if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && SANITIZER_LINUX 242 static void stat64_to_stat(struct stat64 *in, struct stat *out) { 243 internal_memset(out, 0, sizeof(*out)); 244 out->st_dev = in->st_dev; 245 out->st_ino = in->st_ino; 246 out->st_mode = in->st_mode; 247 out->st_nlink = in->st_nlink; 248 out->st_uid = in->st_uid; 249 out->st_gid = in->st_gid; 250 out->st_rdev = in->st_rdev; 251 out->st_size = in->st_size; 252 out->st_blksize = in->st_blksize; 253 out->st_blocks = in->st_blocks; 254 out->st_atime = in->st_atime; 255 out->st_mtime = in->st_mtime; 256 out->st_ctime = in->st_ctime; 257 } 258 #endif 259 260 #if defined(__mips64) 261 // Undefine compatibility macros from <sys/stat.h> 262 // so that they would not clash with the kernel_stat 263 // st_[a|m|c]time fields 264 #undef st_atime 265 #undef st_mtime 266 #undef st_ctime 267 #if defined(SANITIZER_ANDROID) 268 // Bionic sys/stat.h defines additional macros 269 // for compatibility with the old NDKs and 270 // they clash with the kernel_stat structure 271 // st_[a|m|c]time_nsec fields. 272 #undef st_atime_nsec 273 #undef st_mtime_nsec 274 #undef st_ctime_nsec 275 #endif 276 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) { 277 internal_memset(out, 0, sizeof(*out)); 278 out->st_dev = in->st_dev; 279 out->st_ino = in->st_ino; 280 out->st_mode = in->st_mode; 281 out->st_nlink = in->st_nlink; 282 out->st_uid = in->st_uid; 283 out->st_gid = in->st_gid; 284 out->st_rdev = in->st_rdev; 285 out->st_size = in->st_size; 286 out->st_blksize = in->st_blksize; 287 out->st_blocks = in->st_blocks; 288 #if defined(__USE_MISC) || \ 289 defined(__USE_XOPEN2K8) || \ 290 defined(SANITIZER_ANDROID) 291 out->st_atim.tv_sec = in->st_atime; 292 out->st_atim.tv_nsec = in->st_atime_nsec; 293 out->st_mtim.tv_sec = in->st_mtime; 294 out->st_mtim.tv_nsec = in->st_mtime_nsec; 295 out->st_ctim.tv_sec = in->st_ctime; 296 out->st_ctim.tv_nsec = in->st_ctime_nsec; 297 #else 298 out->st_atime = in->st_atime; 299 out->st_atimensec = in->st_atime_nsec; 300 out->st_mtime = in->st_mtime; 301 out->st_mtimensec = in->st_mtime_nsec; 302 out->st_ctime = in->st_ctime; 303 out->st_atimensec = in->st_ctime_nsec; 304 #endif 305 } 306 #endif 307 308 uptr internal_stat(const char *path, void *buf) { 309 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 310 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0); 311 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 312 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 313 0); 314 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 315 # if defined(__mips64) 316 // For mips64, stat syscall fills buffer in the format of kernel_stat 317 struct kernel_stat kbuf; 318 int res = internal_syscall(SYSCALL(stat), path, &kbuf); 319 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 320 return res; 321 # else 322 return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf); 323 # endif 324 #else 325 struct stat64 buf64; 326 int res = internal_syscall(SYSCALL(stat64), path, &buf64); 327 stat64_to_stat(&buf64, (struct stat *)buf); 328 return res; 329 #endif 330 } 331 332 uptr internal_lstat(const char *path, void *buf) { 333 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 334 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 335 AT_SYMLINK_NOFOLLOW); 336 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 337 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 338 AT_SYMLINK_NOFOLLOW); 339 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 340 # if SANITIZER_MIPS64 341 // For mips64, lstat syscall fills buffer in the format of kernel_stat 342 struct kernel_stat kbuf; 343 int res = internal_syscall(SYSCALL(lstat), path, &kbuf); 344 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 345 return res; 346 # else 347 return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf); 348 # endif 349 #else 350 struct stat64 buf64; 351 int res = internal_syscall(SYSCALL(lstat64), path, &buf64); 352 stat64_to_stat(&buf64, (struct stat *)buf); 353 return res; 354 #endif 355 } 356 357 uptr internal_fstat(fd_t fd, void *buf) { 358 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD || \ 359 SANITIZER_LINUX_USES_64BIT_SYSCALLS 360 #if SANITIZER_MIPS64 && !SANITIZER_OPENBSD 361 // For mips64, fstat syscall fills buffer in the format of kernel_stat 362 struct kernel_stat kbuf; 363 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf); 364 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 365 return res; 366 # else 367 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf); 368 # endif 369 #else 370 struct stat64 buf64; 371 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64); 372 stat64_to_stat(&buf64, (struct stat *)buf); 373 return res; 374 #endif 375 } 376 377 uptr internal_filesize(fd_t fd) { 378 struct stat st; 379 if (internal_fstat(fd, &st)) 380 return -1; 381 return (uptr)st.st_size; 382 } 383 384 uptr internal_dup(int oldfd) { 385 return internal_syscall(SYSCALL(dup), oldfd); 386 } 387 388 uptr internal_dup2(int oldfd, int newfd) { 389 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 390 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0); 391 #else 392 return internal_syscall(SYSCALL(dup2), oldfd, newfd); 393 #endif 394 } 395 396 uptr internal_readlink(const char *path, char *buf, uptr bufsize) { 397 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 398 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 399 bufsize); 400 #elif SANITIZER_OPENBSD 401 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 402 bufsize); 403 #else 404 return internal_syscall(SYSCALL(readlink), path, buf, bufsize); 405 #endif 406 } 407 408 uptr internal_unlink(const char *path) { 409 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD 410 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0); 411 #else 412 return internal_syscall(SYSCALL(unlink), (uptr)path); 413 #endif 414 } 415 416 uptr internal_rename(const char *oldpath, const char *newpath) { 417 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD 418 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 419 (uptr)newpath); 420 #else 421 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath); 422 #endif 423 } 424 425 uptr internal_sched_yield() { 426 return internal_syscall(SYSCALL(sched_yield)); 427 } 428 429 void internal__exit(int exitcode) { 430 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 431 internal_syscall(SYSCALL(exit), exitcode); 432 #else 433 internal_syscall(SYSCALL(exit_group), exitcode); 434 #endif 435 Die(); // Unreachable. 436 } 437 438 unsigned int internal_sleep(unsigned int seconds) { 439 struct timespec ts; 440 ts.tv_sec = seconds; 441 ts.tv_nsec = 0; 442 int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts); 443 if (res) return ts.tv_sec; 444 return 0; 445 } 446 447 uptr internal_execve(const char *filename, char *const argv[], 448 char *const envp[]) { 449 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, 450 (uptr)envp); 451 } 452 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 453 454 // ----------------- sanitizer_common.h 455 bool FileExists(const char *filename) { 456 if (ShouldMockFailureToOpen(filename)) 457 return false; 458 struct stat st; 459 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 460 if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0)) 461 #else 462 if (internal_stat(filename, &st)) 463 #endif 464 return false; 465 // Sanity check: filename is a regular file. 466 return S_ISREG(st.st_mode); 467 } 468 469 #if !SANITIZER_NETBSD 470 tid_t GetTid() { 471 #if SANITIZER_FREEBSD 472 long Tid; 473 thr_self(&Tid); 474 return Tid; 475 #elif SANITIZER_OPENBSD 476 return internal_syscall(SYSCALL(getthrid)); 477 #elif SANITIZER_SOLARIS 478 return thr_self(); 479 #else 480 return internal_syscall(SYSCALL(gettid)); 481 #endif 482 } 483 484 int TgKill(pid_t pid, tid_t tid, int sig) { 485 #if SANITIZER_LINUX 486 return internal_syscall(SYSCALL(tgkill), pid, tid, sig); 487 #elif SANITIZER_FREEBSD 488 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig); 489 #elif SANITIZER_OPENBSD 490 (void)pid; 491 return internal_syscall(SYSCALL(thrkill), tid, sig, nullptr); 492 #elif SANITIZER_SOLARIS 493 (void)pid; 494 return thr_kill(tid, sig); 495 #endif 496 } 497 #endif 498 499 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 500 u64 NanoTime() { 501 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 502 timeval tv; 503 #else 504 kernel_timeval tv; 505 #endif 506 internal_memset(&tv, 0, sizeof(tv)); 507 internal_syscall(SYSCALL(gettimeofday), &tv, 0); 508 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000; 509 } 510 511 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) { 512 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp); 513 } 514 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 515 516 // Like getenv, but reads env directly from /proc (on Linux) or parses the 517 // 'environ' array (on some others) and does not use libc. This function 518 // should be called first inside __asan_init. 519 const char *GetEnv(const char *name) { 520 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD || \ 521 SANITIZER_SOLARIS 522 if (::environ != 0) { 523 uptr NameLen = internal_strlen(name); 524 for (char **Env = ::environ; *Env != 0; Env++) { 525 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=') 526 return (*Env) + NameLen + 1; 527 } 528 } 529 return 0; // Not found. 530 #elif SANITIZER_LINUX 531 static char *environ; 532 static uptr len; 533 static bool inited; 534 if (!inited) { 535 inited = true; 536 uptr environ_size; 537 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len)) 538 environ = nullptr; 539 } 540 if (!environ || len == 0) return nullptr; 541 uptr namelen = internal_strlen(name); 542 const char *p = environ; 543 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 544 // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 545 const char* endp = 546 (char*)internal_memchr(p, '\0', len - (p - environ)); 547 if (!endp) // this entry isn't NUL terminated 548 return nullptr; 549 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 550 return p + namelen + 1; // point after = 551 p = endp + 1; 552 } 553 return nullptr; // Not found. 554 #else 555 #error "Unsupported platform" 556 #endif 557 } 558 559 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_OPENBSD 560 extern "C" { 561 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 562 } 563 #endif 564 565 #if !SANITIZER_GO && !SANITIZER_FREEBSD && !SANITIZER_NETBSD && \ 566 !SANITIZER_OPENBSD 567 static void ReadNullSepFileToArray(const char *path, char ***arr, 568 int arr_size) { 569 char *buff; 570 uptr buff_size; 571 uptr buff_len; 572 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 573 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 574 (*arr)[0] = nullptr; 575 return; 576 } 577 (*arr)[0] = buff; 578 int count, i; 579 for (count = 1, i = 1; ; i++) { 580 if (buff[i] == 0) { 581 if (buff[i+1] == 0) break; 582 (*arr)[count] = &buff[i+1]; 583 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 584 count++; 585 } 586 } 587 (*arr)[count] = nullptr; 588 } 589 #endif 590 591 #if !SANITIZER_OPENBSD 592 static void GetArgsAndEnv(char ***argv, char ***envp) { 593 #if SANITIZER_FREEBSD 594 // On FreeBSD, retrieving the argument and environment arrays is done via the 595 // kern.ps_strings sysctl, which returns a pointer to a structure containing 596 // this information. See also <sys/exec.h>. 597 ps_strings *pss; 598 uptr sz = sizeof(pss); 599 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 600 Printf("sysctl kern.ps_strings failed\n"); 601 Die(); 602 } 603 *argv = pss->ps_argvstr; 604 *envp = pss->ps_envstr; 605 #elif SANITIZER_NETBSD 606 *argv = __ps_strings->ps_argvstr; 607 *envp = __ps_strings->ps_envstr; 608 #else // SANITIZER_FREEBSD 609 #if !SANITIZER_GO 610 if (&__libc_stack_end) { 611 #endif // !SANITIZER_GO 612 uptr* stack_end = (uptr*)__libc_stack_end; 613 int argc = *stack_end; 614 *argv = (char**)(stack_end + 1); 615 *envp = (char**)(stack_end + argc + 2); 616 #if !SANITIZER_GO 617 } else { 618 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 619 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 620 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 621 } 622 #endif // !SANITIZER_GO 623 #endif // SANITIZER_FREEBSD 624 } 625 626 char **GetArgv() { 627 char **argv, **envp; 628 GetArgsAndEnv(&argv, &envp); 629 return argv; 630 } 631 632 char **GetEnviron() { 633 char **argv, **envp; 634 GetArgsAndEnv(&argv, &envp); 635 return envp; 636 } 637 638 #endif // !SANITIZER_OPENBSD 639 640 #if !SANITIZER_SOLARIS 641 enum MutexState { 642 MtxUnlocked = 0, 643 MtxLocked = 1, 644 MtxSleeping = 2 645 }; 646 647 BlockingMutex::BlockingMutex() { 648 internal_memset(this, 0, sizeof(*this)); 649 } 650 651 void BlockingMutex::Lock() { 652 CHECK_EQ(owner_, 0); 653 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 654 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked) 655 return; 656 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) { 657 #if SANITIZER_FREEBSD 658 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0); 659 #elif SANITIZER_NETBSD 660 sched_yield(); /* No userspace futex-like synchronization */ 661 #else 662 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT_PRIVATE, MtxSleeping, 663 0, 0, 0); 664 #endif 665 } 666 } 667 668 void BlockingMutex::Unlock() { 669 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 670 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release); 671 CHECK_NE(v, MtxUnlocked); 672 if (v == MtxSleeping) { 673 #if SANITIZER_FREEBSD 674 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0); 675 #elif SANITIZER_NETBSD 676 /* No userspace futex-like synchronization */ 677 #else 678 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0); 679 #endif 680 } 681 } 682 683 void BlockingMutex::CheckLocked() { 684 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 685 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed)); 686 } 687 #endif // !SANITIZER_SOLARIS 688 689 // ----------------- sanitizer_linux.h 690 // The actual size of this structure is specified by d_reclen. 691 // Note that getdents64 uses a different structure format. We only provide the 692 // 32-bit syscall here. 693 #if SANITIZER_NETBSD 694 // Not used 695 #elif SANITIZER_OPENBSD 696 // struct dirent is different for Linux and us. At this moment, we use only 697 // d_fileno (Linux call this d_ino), d_reclen, and d_name. 698 struct linux_dirent { 699 u64 d_ino; // d_fileno 700 u16 d_reclen; 701 u16 d_namlen; // not used 702 u8 d_type; // not used 703 char d_name[NAME_MAX + 1]; 704 }; 705 #else 706 struct linux_dirent { 707 #if SANITIZER_X32 || defined(__aarch64__) 708 u64 d_ino; 709 u64 d_off; 710 #else 711 unsigned long d_ino; 712 unsigned long d_off; 713 #endif 714 unsigned short d_reclen; 715 #ifdef __aarch64__ 716 unsigned char d_type; 717 #endif 718 char d_name[256]; 719 }; 720 #endif 721 722 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 723 // Syscall wrappers. 724 uptr internal_ptrace(int request, int pid, void *addr, void *data) { 725 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 726 (uptr)data); 727 } 728 729 uptr internal_waitpid(int pid, int *status, int options) { 730 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 731 0 /* rusage */); 732 } 733 734 uptr internal_getpid() { 735 return internal_syscall(SYSCALL(getpid)); 736 } 737 738 uptr internal_getppid() { 739 return internal_syscall(SYSCALL(getppid)); 740 } 741 742 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 743 #if SANITIZER_FREEBSD 744 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 745 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 746 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 747 #else 748 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 749 #endif 750 } 751 752 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 753 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 754 } 755 756 #if SANITIZER_LINUX 757 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 758 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 759 } 760 #endif 761 762 uptr internal_sigaltstack(const void *ss, void *oss) { 763 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 764 } 765 766 int internal_fork() { 767 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 768 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 769 #else 770 return internal_syscall(SYSCALL(fork)); 771 #endif 772 } 773 774 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 775 int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 776 uptr *oldlenp, const void *newp, uptr newlen) { 777 #if SANITIZER_OPENBSD 778 return sysctl(name, namelen, oldp, (size_t *)oldlenp, (void *)newp, 779 (size_t)newlen); 780 #else 781 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 782 (size_t *)oldlenp, newp, (size_t)newlen); 783 #endif 784 } 785 786 #if SANITIZER_FREEBSD 787 int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 788 const void *newp, uptr newlen) { 789 return sysctlbyname(sname, oldp, (size_t *)oldlenp, newp, (size_t)newlen); 790 } 791 #endif 792 #endif 793 794 #if SANITIZER_LINUX 795 #define SA_RESTORER 0x04000000 796 // Doesn't set sa_restorer if the caller did not set it, so use with caution 797 //(see below). 798 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 799 __sanitizer_kernel_sigaction_t k_act, k_oldact; 800 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 801 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 802 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 803 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 804 if (u_act) { 805 k_act.handler = u_act->handler; 806 k_act.sigaction = u_act->sigaction; 807 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 808 sizeof(__sanitizer_kernel_sigset_t)); 809 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 810 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 811 // FIXME: most often sa_restorer is unset, however the kernel requires it 812 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 813 // If sa_restorer passed to the kernel is NULL, the program may crash upon 814 // signal delivery or fail to unwind the stack in the signal handler. 815 // libc implementation of sigaction() passes its own restorer to 816 // rt_sigaction, so we need to do the same (we'll need to reimplement the 817 // restorers; for x86_64 the restorer address can be obtained from 818 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 819 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 820 k_act.sa_restorer = u_act->sa_restorer; 821 #endif 822 } 823 824 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 825 (uptr)(u_act ? &k_act : nullptr), 826 (uptr)(u_oldact ? &k_oldact : nullptr), 827 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 828 829 if ((result == 0) && u_oldact) { 830 u_oldact->handler = k_oldact.handler; 831 u_oldact->sigaction = k_oldact.sigaction; 832 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 833 sizeof(__sanitizer_kernel_sigset_t)); 834 u_oldact->sa_flags = k_oldact.sa_flags; 835 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 836 u_oldact->sa_restorer = k_oldact.sa_restorer; 837 #endif 838 } 839 return result; 840 } 841 842 // Invokes sigaction via a raw syscall with a restorer, but does not support 843 // all platforms yet. 844 // We disable for Go simply because we have not yet added to buildgo.sh. 845 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO 846 int internal_sigaction_syscall(int signum, const void *act, void *oldact) { 847 if (act == nullptr) 848 return internal_sigaction_norestorer(signum, act, oldact); 849 __sanitizer_sigaction u_adjust; 850 internal_memcpy(&u_adjust, act, sizeof(u_adjust)); 851 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 852 if (u_adjust.sa_restorer == nullptr) { 853 u_adjust.sa_restorer = internal_sigreturn; 854 } 855 #endif 856 return internal_sigaction_norestorer(signum, (const void *)&u_adjust, oldact); 857 } 858 #endif // defined(__x86_64__) && !SANITIZER_GO 859 #endif // SANITIZER_LINUX 860 861 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 862 __sanitizer_sigset_t *oldset) { 863 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 864 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 865 #else 866 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 867 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 868 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, 869 (uptr)&k_set->sig[0], (uptr)&k_oldset->sig[0], 870 sizeof(__sanitizer_kernel_sigset_t)); 871 #endif 872 } 873 874 void internal_sigfillset(__sanitizer_sigset_t *set) { 875 internal_memset(set, 0xff, sizeof(*set)); 876 } 877 878 void internal_sigemptyset(__sanitizer_sigset_t *set) { 879 internal_memset(set, 0, sizeof(*set)); 880 } 881 882 #if SANITIZER_LINUX 883 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 884 signum -= 1; 885 CHECK_GE(signum, 0); 886 CHECK_LT(signum, sizeof(*set) * 8); 887 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 888 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 889 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 890 k_set->sig[idx] &= ~(1 << bit); 891 } 892 893 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 894 signum -= 1; 895 CHECK_GE(signum, 0); 896 CHECK_LT(signum, sizeof(*set) * 8); 897 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 898 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 899 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 900 return k_set->sig[idx] & (1 << bit); 901 } 902 #elif SANITIZER_FREEBSD 903 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 904 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 905 sigdelset(rset, signum); 906 } 907 908 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 909 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 910 return sigismember(rset, signum); 911 } 912 #endif 913 #endif // !SANITIZER_SOLARIS 914 915 #if !SANITIZER_NETBSD 916 // ThreadLister implementation. 917 ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) { 918 char task_directory_path[80]; 919 internal_snprintf(task_directory_path, sizeof(task_directory_path), 920 "/proc/%d/task/", pid); 921 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 922 if (internal_iserror(descriptor_)) { 923 Report("Can't open /proc/%d/task for reading.\n", pid); 924 } 925 } 926 927 ThreadLister::Result ThreadLister::ListThreads( 928 InternalMmapVector<tid_t> *threads) { 929 if (internal_iserror(descriptor_)) 930 return Error; 931 internal_lseek(descriptor_, 0, SEEK_SET); 932 threads->clear(); 933 934 Result result = Ok; 935 for (bool first_read = true;; first_read = false) { 936 // Resize to max capacity if it was downsized by IsAlive. 937 buffer_.resize(buffer_.capacity()); 938 CHECK_GE(buffer_.size(), 4096); 939 uptr read = internal_getdents( 940 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size()); 941 if (!read) 942 return result; 943 if (internal_iserror(read)) { 944 Report("Can't read directory entries from /proc/%d/task.\n", pid_); 945 return Error; 946 } 947 948 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 949 struct linux_dirent *entry = (struct linux_dirent *)begin; 950 begin += entry->d_reclen; 951 if (entry->d_ino == 1) { 952 // Inode 1 is for bad blocks and also can be a reason for early return. 953 // Should be emitted if kernel tried to output terminating thread. 954 // See proc_task_readdir implementation in Linux. 955 result = Incomplete; 956 } 957 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 958 threads->push_back(internal_atoll(entry->d_name)); 959 } 960 961 // Now we are going to detect short-read or early EOF. In such cases Linux 962 // can return inconsistent list with missing alive threads. 963 // Code will just remember that the list can be incomplete but it will 964 // continue reads to return as much as possible. 965 if (!first_read) { 966 // The first one was a short-read by definition. 967 result = Incomplete; 968 } else if (read > buffer_.size() - 1024) { 969 // Read was close to the buffer size. So double the size and assume the 970 // worst. 971 buffer_.resize(buffer_.size() * 2); 972 result = Incomplete; 973 } else if (!threads->empty() && !IsAlive(threads->back())) { 974 // Maybe Linux early returned from read on terminated thread (!pid_alive) 975 // and failed to restore read position. 976 // See next_tid and proc_task_instantiate in Linux. 977 result = Incomplete; 978 } 979 } 980 } 981 982 bool ThreadLister::IsAlive(int tid) { 983 // /proc/%d/task/%d/status uses same call to detect alive threads as 984 // proc_task_readdir. See task_state implementation in Linux. 985 char path[80]; 986 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid); 987 if (!ReadFileToVector(path, &buffer_) || buffer_.empty()) 988 return false; 989 buffer_.push_back(0); 990 static const char kPrefix[] = "\nPPid:"; 991 const char *field = internal_strstr(buffer_.data(), kPrefix); 992 if (!field) 993 return false; 994 field += internal_strlen(kPrefix); 995 return (int)internal_atoll(field) != 0; 996 } 997 998 ThreadLister::~ThreadLister() { 999 if (!internal_iserror(descriptor_)) 1000 internal_close(descriptor_); 1001 } 1002 #endif 1003 1004 #if SANITIZER_WORDSIZE == 32 1005 // Take care of unusable kernel area in top gigabyte. 1006 static uptr GetKernelAreaSize() { 1007 #if SANITIZER_LINUX && !SANITIZER_X32 1008 const uptr gbyte = 1UL << 30; 1009 1010 // Firstly check if there are writable segments 1011 // mapped to top gigabyte (e.g. stack). 1012 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 1013 if (proc_maps.Error()) 1014 return 0; 1015 MemoryMappedSegment segment; 1016 while (proc_maps.Next(&segment)) { 1017 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0; 1018 } 1019 1020 #if !SANITIZER_ANDROID 1021 // Even if nothing is mapped, top Gb may still be accessible 1022 // if we are running on 64-bit kernel. 1023 // Uname may report misleading results if personality type 1024 // is modified (e.g. under schroot) so check this as well. 1025 struct utsname uname_info; 1026 int pers = personality(0xffffffffUL); 1027 if (!(pers & PER_MASK) 1028 && uname(&uname_info) == 0 1029 && internal_strstr(uname_info.machine, "64")) 1030 return 0; 1031 #endif // SANITIZER_ANDROID 1032 1033 // Top gigabyte is reserved for kernel. 1034 return gbyte; 1035 #else 1036 return 0; 1037 #endif // SANITIZER_LINUX && !SANITIZER_X32 1038 } 1039 #endif // SANITIZER_WORDSIZE == 32 1040 1041 uptr GetMaxVirtualAddress() { 1042 #if (SANITIZER_NETBSD || SANITIZER_OPENBSD) && defined(__x86_64__) 1043 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE) 1044 #elif SANITIZER_WORDSIZE == 64 1045 # if defined(__powerpc64__) || defined(__aarch64__) 1046 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 1047 // We somehow need to figure out which one we are using now and choose 1048 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 1049 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 1050 // of the address space, so simply checking the stack address is not enough. 1051 // This should (does) work for both PowerPC64 Endian modes. 1052 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit. 1053 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1; 1054 # elif defined(__mips64) 1055 return (1ULL << 40) - 1; // 0x000000ffffffffffUL; 1056 # elif defined(__s390x__) 1057 return (1ULL << 53) - 1; // 0x001fffffffffffffUL; 1058 # else 1059 return (1ULL << 47) - 1; // 0x00007fffffffffffUL; 1060 # endif 1061 #else // SANITIZER_WORDSIZE == 32 1062 # if defined(__s390__) 1063 return (1ULL << 31) - 1; // 0x7fffffff; 1064 # else 1065 return (1ULL << 32) - 1; // 0xffffffff; 1066 # endif 1067 #endif // SANITIZER_WORDSIZE 1068 } 1069 1070 uptr GetMaxUserVirtualAddress() { 1071 uptr addr = GetMaxVirtualAddress(); 1072 #if SANITIZER_WORDSIZE == 32 && !defined(__s390__) 1073 if (!common_flags()->full_address_space) 1074 addr -= GetKernelAreaSize(); 1075 CHECK_LT(reinterpret_cast<uptr>(&addr), addr); 1076 #endif 1077 return addr; 1078 } 1079 1080 uptr GetPageSize() { 1081 // Android post-M sysconf(_SC_PAGESIZE) crashes if called from .preinit_array. 1082 #if SANITIZER_ANDROID 1083 return 4096; 1084 #elif SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) 1085 return EXEC_PAGESIZE; 1086 #elif SANITIZER_USE_GETAUXVAL 1087 return getauxval(AT_PAGESZ); 1088 #elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1089 // Use sysctl as sysconf can trigger interceptors internally. 1090 int pz = 0; 1091 uptr pzl = sizeof(pz); 1092 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1093 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1094 CHECK_EQ(rv, 0); 1095 return (uptr)pz; 1096 #else 1097 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1098 #endif 1099 } 1100 1101 #if !SANITIZER_OPENBSD 1102 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { 1103 #if SANITIZER_SOLARIS 1104 const char *default_module_name = getexecname(); 1105 CHECK_NE(default_module_name, NULL); 1106 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1107 #else 1108 #if SANITIZER_FREEBSD || SANITIZER_NETBSD 1109 #if SANITIZER_FREEBSD 1110 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1111 #else 1112 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1113 #endif 1114 const char *default_module_name = "kern.proc.pathname"; 1115 uptr Size = buf_len; 1116 bool IsErr = 1117 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1118 int readlink_error = IsErr ? errno : 0; 1119 uptr module_name_len = Size; 1120 #else 1121 const char *default_module_name = "/proc/self/exe"; 1122 uptr module_name_len = internal_readlink( 1123 default_module_name, buf, buf_len); 1124 int readlink_error; 1125 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1126 #endif // SANITIZER_SOLARIS 1127 if (IsErr) { 1128 // We can't read binary name for some reason, assume it's unknown. 1129 Report("WARNING: reading executable name failed with errno %d, " 1130 "some stack frames may not be symbolized\n", readlink_error); 1131 module_name_len = internal_snprintf(buf, buf_len, "%s", 1132 default_module_name); 1133 CHECK_LT(module_name_len, buf_len); 1134 } 1135 return module_name_len; 1136 #endif 1137 } 1138 #endif // !SANITIZER_OPENBSD 1139 1140 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1141 #if SANITIZER_LINUX 1142 char *tmpbuf; 1143 uptr tmpsize; 1144 uptr tmplen; 1145 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1146 1024 * 1024)) { 1147 internal_strncpy(buf, tmpbuf, buf_len); 1148 UnmapOrDie(tmpbuf, tmpsize); 1149 return internal_strlen(buf); 1150 } 1151 #endif 1152 return ReadBinaryName(buf, buf_len); 1153 } 1154 1155 // Match full names of the form /path/to/base_name{-,.}* 1156 bool LibraryNameIs(const char *full_name, const char *base_name) { 1157 const char *name = full_name; 1158 // Strip path. 1159 while (*name != '\0') name++; 1160 while (name > full_name && *name != '/') name--; 1161 if (*name == '/') name++; 1162 uptr base_name_length = internal_strlen(base_name); 1163 if (internal_strncmp(name, base_name, base_name_length)) return false; 1164 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1165 } 1166 1167 #if !SANITIZER_ANDROID 1168 // Call cb for each region mapped by map. 1169 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1170 CHECK_NE(map, nullptr); 1171 #if !SANITIZER_FREEBSD && !SANITIZER_OPENBSD 1172 typedef ElfW(Phdr) Elf_Phdr; 1173 typedef ElfW(Ehdr) Elf_Ehdr; 1174 #endif // !SANITIZER_FREEBSD && !SANITIZER_OPENBSD 1175 char *base = (char *)map->l_addr; 1176 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1177 char *phdrs = base + ehdr->e_phoff; 1178 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1179 1180 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1181 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1182 // objects have a non-zero base. 1183 uptr preferred_base = (uptr)-1; 1184 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1185 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1186 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1187 preferred_base = (uptr)phdr->p_vaddr; 1188 } 1189 1190 // Compute the delta from the real base to get a relocation delta. 1191 sptr delta = (uptr)base - preferred_base; 1192 // Now we can figure out what the loader really mapped. 1193 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1194 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1195 if (phdr->p_type == PT_LOAD) { 1196 uptr seg_start = phdr->p_vaddr + delta; 1197 uptr seg_end = seg_start + phdr->p_memsz; 1198 // None of these values are aligned. We consider the ragged edges of the 1199 // load command as defined, since they are mapped from the file. 1200 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1201 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1202 cb((void *)seg_start, seg_end - seg_start); 1203 } 1204 } 1205 } 1206 #endif 1207 1208 #if defined(__x86_64__) && SANITIZER_LINUX 1209 // We cannot use glibc's clone wrapper, because it messes with the child 1210 // task's TLS. It writes the PID and TID of the child task to its thread 1211 // descriptor, but in our case the child task shares the thread descriptor with 1212 // the parent (because we don't know how to allocate a new thread 1213 // descriptor to keep glibc happy). So the stock version of clone(), when 1214 // used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1215 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1216 int *parent_tidptr, void *newtls, int *child_tidptr) { 1217 long long res; 1218 if (!fn || !child_stack) 1219 return -EINVAL; 1220 CHECK_EQ(0, (uptr)child_stack % 16); 1221 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1222 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1223 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1224 register void *r8 __asm__("r8") = newtls; 1225 register int *r10 __asm__("r10") = child_tidptr; 1226 __asm__ __volatile__( 1227 /* %rax = syscall(%rax = SYSCALL(clone), 1228 * %rdi = flags, 1229 * %rsi = child_stack, 1230 * %rdx = parent_tidptr, 1231 * %r8 = new_tls, 1232 * %r10 = child_tidptr) 1233 */ 1234 "syscall\n" 1235 1236 /* if (%rax != 0) 1237 * return; 1238 */ 1239 "testq %%rax,%%rax\n" 1240 "jnz 1f\n" 1241 1242 /* In the child. Terminate unwind chain. */ 1243 // XXX: We should also terminate the CFI unwind chain 1244 // here. Unfortunately clang 3.2 doesn't support the 1245 // necessary CFI directives, so we skip that part. 1246 "xorq %%rbp,%%rbp\n" 1247 1248 /* Call "fn(arg)". */ 1249 "popq %%rax\n" 1250 "popq %%rdi\n" 1251 "call *%%rax\n" 1252 1253 /* Call _exit(%rax). */ 1254 "movq %%rax,%%rdi\n" 1255 "movq %2,%%rax\n" 1256 "syscall\n" 1257 1258 /* Return to parent. */ 1259 "1:\n" 1260 : "=a" (res) 1261 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1262 "S"(child_stack), 1263 "D"(flags), 1264 "d"(parent_tidptr), 1265 "r"(r8), 1266 "r"(r10) 1267 : "memory", "r11", "rcx"); 1268 return res; 1269 } 1270 #elif defined(__mips__) 1271 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1272 int *parent_tidptr, void *newtls, int *child_tidptr) { 1273 long long res; 1274 if (!fn || !child_stack) 1275 return -EINVAL; 1276 CHECK_EQ(0, (uptr)child_stack % 16); 1277 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1278 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1279 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1280 register void *a3 __asm__("$7") = newtls; 1281 register int *a4 __asm__("$8") = child_tidptr; 1282 // We don't have proper CFI directives here because it requires alot of code 1283 // for very marginal benefits. 1284 __asm__ __volatile__( 1285 /* $v0 = syscall($v0 = __NR_clone, 1286 * $a0 = flags, 1287 * $a1 = child_stack, 1288 * $a2 = parent_tidptr, 1289 * $a3 = new_tls, 1290 * $a4 = child_tidptr) 1291 */ 1292 ".cprestore 16;\n" 1293 "move $4,%1;\n" 1294 "move $5,%2;\n" 1295 "move $6,%3;\n" 1296 "move $7,%4;\n" 1297 /* Store the fifth argument on stack 1298 * if we are using 32-bit abi. 1299 */ 1300 #if SANITIZER_WORDSIZE == 32 1301 "lw %5,16($29);\n" 1302 #else 1303 "move $8,%5;\n" 1304 #endif 1305 "li $2,%6;\n" 1306 "syscall;\n" 1307 1308 /* if ($v0 != 0) 1309 * return; 1310 */ 1311 "bnez $2,1f;\n" 1312 1313 /* Call "fn(arg)". */ 1314 #if SANITIZER_WORDSIZE == 32 1315 #ifdef __BIG_ENDIAN__ 1316 "lw $25,4($29);\n" 1317 "lw $4,12($29);\n" 1318 #else 1319 "lw $25,0($29);\n" 1320 "lw $4,8($29);\n" 1321 #endif 1322 #else 1323 "ld $25,0($29);\n" 1324 "ld $4,8($29);\n" 1325 #endif 1326 "jal $25;\n" 1327 1328 /* Call _exit($v0). */ 1329 "move $4,$2;\n" 1330 "li $2,%7;\n" 1331 "syscall;\n" 1332 1333 /* Return to parent. */ 1334 "1:\n" 1335 : "=r" (res) 1336 : "r"(flags), 1337 "r"(child_stack), 1338 "r"(parent_tidptr), 1339 "r"(a3), 1340 "r"(a4), 1341 "i"(__NR_clone), 1342 "i"(__NR_exit) 1343 : "memory", "$29" ); 1344 return res; 1345 } 1346 #elif defined(__aarch64__) 1347 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1348 int *parent_tidptr, void *newtls, int *child_tidptr) { 1349 long long res; 1350 if (!fn || !child_stack) 1351 return -EINVAL; 1352 CHECK_EQ(0, (uptr)child_stack % 16); 1353 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1354 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1355 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1356 1357 register int (*__fn)(void *) __asm__("x0") = fn; 1358 register void *__stack __asm__("x1") = child_stack; 1359 register int __flags __asm__("x2") = flags; 1360 register void *__arg __asm__("x3") = arg; 1361 register int *__ptid __asm__("x4") = parent_tidptr; 1362 register void *__tls __asm__("x5") = newtls; 1363 register int *__ctid __asm__("x6") = child_tidptr; 1364 1365 __asm__ __volatile__( 1366 "mov x0,x2\n" /* flags */ 1367 "mov x2,x4\n" /* ptid */ 1368 "mov x3,x5\n" /* tls */ 1369 "mov x4,x6\n" /* ctid */ 1370 "mov x8,%9\n" /* clone */ 1371 1372 "svc 0x0\n" 1373 1374 /* if (%r0 != 0) 1375 * return %r0; 1376 */ 1377 "cmp x0, #0\n" 1378 "bne 1f\n" 1379 1380 /* In the child, now. Call "fn(arg)". */ 1381 "ldp x1, x0, [sp], #16\n" 1382 "blr x1\n" 1383 1384 /* Call _exit(%r0). */ 1385 "mov x8, %10\n" 1386 "svc 0x0\n" 1387 "1:\n" 1388 1389 : "=r" (res) 1390 : "i"(-EINVAL), 1391 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1392 "r"(__ptid), "r"(__tls), "r"(__ctid), 1393 "i"(__NR_clone), "i"(__NR_exit) 1394 : "x30", "memory"); 1395 return res; 1396 } 1397 #elif defined(__powerpc64__) 1398 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1399 int *parent_tidptr, void *newtls, int *child_tidptr) { 1400 long long res; 1401 // Stack frame structure. 1402 #if SANITIZER_PPC64V1 1403 // Back chain == 0 (SP + 112) 1404 // Frame (112 bytes): 1405 // Parameter save area (SP + 48), 8 doublewords 1406 // TOC save area (SP + 40) 1407 // Link editor doubleword (SP + 32) 1408 // Compiler doubleword (SP + 24) 1409 // LR save area (SP + 16) 1410 // CR save area (SP + 8) 1411 // Back chain (SP + 0) 1412 # define FRAME_SIZE 112 1413 # define FRAME_TOC_SAVE_OFFSET 40 1414 #elif SANITIZER_PPC64V2 1415 // Back chain == 0 (SP + 32) 1416 // Frame (32 bytes): 1417 // TOC save area (SP + 24) 1418 // LR save area (SP + 16) 1419 // CR save area (SP + 8) 1420 // Back chain (SP + 0) 1421 # define FRAME_SIZE 32 1422 # define FRAME_TOC_SAVE_OFFSET 24 1423 #else 1424 # error "Unsupported PPC64 ABI" 1425 #endif 1426 if (!fn || !child_stack) 1427 return -EINVAL; 1428 CHECK_EQ(0, (uptr)child_stack % 16); 1429 1430 register int (*__fn)(void *) __asm__("r3") = fn; 1431 register void *__cstack __asm__("r4") = child_stack; 1432 register int __flags __asm__("r5") = flags; 1433 register void *__arg __asm__("r6") = arg; 1434 register int *__ptidptr __asm__("r7") = parent_tidptr; 1435 register void *__newtls __asm__("r8") = newtls; 1436 register int *__ctidptr __asm__("r9") = child_tidptr; 1437 1438 __asm__ __volatile__( 1439 /* fn and arg are saved across the syscall */ 1440 "mr 28, %5\n\t" 1441 "mr 27, %8\n\t" 1442 1443 /* syscall 1444 r0 == __NR_clone 1445 r3 == flags 1446 r4 == child_stack 1447 r5 == parent_tidptr 1448 r6 == newtls 1449 r7 == child_tidptr */ 1450 "mr 3, %7\n\t" 1451 "mr 5, %9\n\t" 1452 "mr 6, %10\n\t" 1453 "mr 7, %11\n\t" 1454 "li 0, %3\n\t" 1455 "sc\n\t" 1456 1457 /* Test if syscall was successful */ 1458 "cmpdi cr1, 3, 0\n\t" 1459 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1460 "bne- cr1, 1f\n\t" 1461 1462 /* Set up stack frame */ 1463 "li 29, 0\n\t" 1464 "stdu 29, -8(1)\n\t" 1465 "stdu 1, -%12(1)\n\t" 1466 /* Do the function call */ 1467 "std 2, %13(1)\n\t" 1468 #if SANITIZER_PPC64V1 1469 "ld 0, 0(28)\n\t" 1470 "ld 2, 8(28)\n\t" 1471 "mtctr 0\n\t" 1472 #elif SANITIZER_PPC64V2 1473 "mr 12, 28\n\t" 1474 "mtctr 12\n\t" 1475 #else 1476 # error "Unsupported PPC64 ABI" 1477 #endif 1478 "mr 3, 27\n\t" 1479 "bctrl\n\t" 1480 "ld 2, %13(1)\n\t" 1481 1482 /* Call _exit(r3) */ 1483 "li 0, %4\n\t" 1484 "sc\n\t" 1485 1486 /* Return to parent */ 1487 "1:\n\t" 1488 "mr %0, 3\n\t" 1489 : "=r" (res) 1490 : "0" (-1), 1491 "i" (EINVAL), 1492 "i" (__NR_clone), 1493 "i" (__NR_exit), 1494 "r" (__fn), 1495 "r" (__cstack), 1496 "r" (__flags), 1497 "r" (__arg), 1498 "r" (__ptidptr), 1499 "r" (__newtls), 1500 "r" (__ctidptr), 1501 "i" (FRAME_SIZE), 1502 "i" (FRAME_TOC_SAVE_OFFSET) 1503 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1504 return res; 1505 } 1506 #elif defined(__i386__) && SANITIZER_LINUX 1507 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1508 int *parent_tidptr, void *newtls, int *child_tidptr) { 1509 int res; 1510 if (!fn || !child_stack) 1511 return -EINVAL; 1512 CHECK_EQ(0, (uptr)child_stack % 16); 1513 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1514 ((unsigned int *)child_stack)[0] = (uptr)flags; 1515 ((unsigned int *)child_stack)[1] = (uptr)0; 1516 ((unsigned int *)child_stack)[2] = (uptr)fn; 1517 ((unsigned int *)child_stack)[3] = (uptr)arg; 1518 __asm__ __volatile__( 1519 /* %eax = syscall(%eax = SYSCALL(clone), 1520 * %ebx = flags, 1521 * %ecx = child_stack, 1522 * %edx = parent_tidptr, 1523 * %esi = new_tls, 1524 * %edi = child_tidptr) 1525 */ 1526 1527 /* Obtain flags */ 1528 "movl (%%ecx), %%ebx\n" 1529 /* Do the system call */ 1530 "pushl %%ebx\n" 1531 "pushl %%esi\n" 1532 "pushl %%edi\n" 1533 /* Remember the flag value. */ 1534 "movl %%ebx, (%%ecx)\n" 1535 "int $0x80\n" 1536 "popl %%edi\n" 1537 "popl %%esi\n" 1538 "popl %%ebx\n" 1539 1540 /* if (%eax != 0) 1541 * return; 1542 */ 1543 1544 "test %%eax,%%eax\n" 1545 "jnz 1f\n" 1546 1547 /* terminate the stack frame */ 1548 "xorl %%ebp,%%ebp\n" 1549 /* Call FN. */ 1550 "call *%%ebx\n" 1551 #ifdef PIC 1552 "call here\n" 1553 "here:\n" 1554 "popl %%ebx\n" 1555 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1556 #endif 1557 /* Call exit */ 1558 "movl %%eax, %%ebx\n" 1559 "movl %2, %%eax\n" 1560 "int $0x80\n" 1561 "1:\n" 1562 : "=a" (res) 1563 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1564 "c"(child_stack), 1565 "d"(parent_tidptr), 1566 "S"(newtls), 1567 "D"(child_tidptr) 1568 : "memory"); 1569 return res; 1570 } 1571 #elif defined(__arm__) && SANITIZER_LINUX 1572 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1573 int *parent_tidptr, void *newtls, int *child_tidptr) { 1574 unsigned int res; 1575 if (!fn || !child_stack) 1576 return -EINVAL; 1577 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1578 ((unsigned int *)child_stack)[0] = (uptr)fn; 1579 ((unsigned int *)child_stack)[1] = (uptr)arg; 1580 register int r0 __asm__("r0") = flags; 1581 register void *r1 __asm__("r1") = child_stack; 1582 register int *r2 __asm__("r2") = parent_tidptr; 1583 register void *r3 __asm__("r3") = newtls; 1584 register int *r4 __asm__("r4") = child_tidptr; 1585 register int r7 __asm__("r7") = __NR_clone; 1586 1587 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) 1588 # define ARCH_HAS_BX 1589 #endif 1590 #if __ARM_ARCH > 4 1591 # define ARCH_HAS_BLX 1592 #endif 1593 1594 #ifdef ARCH_HAS_BX 1595 # ifdef ARCH_HAS_BLX 1596 # define BLX(R) "blx " #R "\n" 1597 # else 1598 # define BLX(R) "mov lr, pc; bx " #R "\n" 1599 # endif 1600 #else 1601 # define BLX(R) "mov lr, pc; mov pc," #R "\n" 1602 #endif 1603 1604 __asm__ __volatile__( 1605 /* %r0 = syscall(%r7 = SYSCALL(clone), 1606 * %r0 = flags, 1607 * %r1 = child_stack, 1608 * %r2 = parent_tidptr, 1609 * %r3 = new_tls, 1610 * %r4 = child_tidptr) 1611 */ 1612 1613 /* Do the system call */ 1614 "swi 0x0\n" 1615 1616 /* if (%r0 != 0) 1617 * return %r0; 1618 */ 1619 "cmp r0, #0\n" 1620 "bne 1f\n" 1621 1622 /* In the child, now. Call "fn(arg)". */ 1623 "ldr r0, [sp, #4]\n" 1624 "ldr ip, [sp], #8\n" 1625 BLX(ip) 1626 /* Call _exit(%r0). */ 1627 "mov r7, %7\n" 1628 "swi 0x0\n" 1629 "1:\n" 1630 "mov %0, r0\n" 1631 : "=r"(res) 1632 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), 1633 "i"(__NR_exit) 1634 : "memory"); 1635 return res; 1636 } 1637 #endif // defined(__x86_64__) && SANITIZER_LINUX 1638 1639 #if SANITIZER_ANDROID 1640 #if __ANDROID_API__ < 21 1641 extern "C" __attribute__((weak)) int dl_iterate_phdr( 1642 int (*)(struct dl_phdr_info *, size_t, void *), void *); 1643 #endif 1644 1645 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, 1646 void *data) { 1647 // Any name starting with "lib" indicates a bug in L where library base names 1648 // are returned instead of paths. 1649 if (info->dlpi_name && info->dlpi_name[0] == 'l' && 1650 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { 1651 *(bool *)data = true; 1652 return 1; 1653 } 1654 return 0; 1655 } 1656 1657 static atomic_uint32_t android_api_level; 1658 1659 static AndroidApiLevel AndroidDetectApiLevelStatic() { 1660 #if __ANDROID_API__ <= 19 1661 return ANDROID_KITKAT; 1662 #elif __ANDROID_API__ <= 22 1663 return ANDROID_LOLLIPOP_MR1; 1664 #else 1665 return ANDROID_POST_LOLLIPOP; 1666 #endif 1667 } 1668 1669 static AndroidApiLevel AndroidDetectApiLevel() { 1670 if (!&dl_iterate_phdr) 1671 return ANDROID_KITKAT; // K or lower 1672 bool base_name_seen = false; 1673 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); 1674 if (base_name_seen) 1675 return ANDROID_LOLLIPOP_MR1; // L MR1 1676 return ANDROID_POST_LOLLIPOP; // post-L 1677 // Plain L (API level 21) is completely broken wrt ASan and not very 1678 // interesting to detect. 1679 } 1680 1681 extern "C" __attribute__((weak)) void* _DYNAMIC; 1682 1683 AndroidApiLevel AndroidGetApiLevel() { 1684 AndroidApiLevel level = 1685 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); 1686 if (level) return level; 1687 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic() 1688 : AndroidDetectApiLevel(); 1689 atomic_store(&android_api_level, level, memory_order_relaxed); 1690 return level; 1691 } 1692 1693 #endif 1694 1695 static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1696 switch (signum) { 1697 case SIGABRT: 1698 return common_flags()->handle_abort; 1699 case SIGILL: 1700 return common_flags()->handle_sigill; 1701 case SIGTRAP: 1702 return common_flags()->handle_sigtrap; 1703 case SIGFPE: 1704 return common_flags()->handle_sigfpe; 1705 case SIGSEGV: 1706 return common_flags()->handle_segv; 1707 case SIGBUS: 1708 return common_flags()->handle_sigbus; 1709 } 1710 return kHandleSignalNo; 1711 } 1712 1713 HandleSignalMode GetHandleSignalMode(int signum) { 1714 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1715 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1716 return kHandleSignalExclusive; 1717 return result; 1718 } 1719 1720 #if !SANITIZER_GO 1721 void *internal_start_thread(void(*func)(void *arg), void *arg) { 1722 // Start the thread with signals blocked, otherwise it can steal user signals. 1723 __sanitizer_sigset_t set, old; 1724 internal_sigfillset(&set); 1725 #if SANITIZER_LINUX && !SANITIZER_ANDROID 1726 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 1727 // on any thread, setuid call hangs (see test/tsan/setuid.c). 1728 internal_sigdelset(&set, 33); 1729 #endif 1730 internal_sigprocmask(SIG_SETMASK, &set, &old); 1731 void *th; 1732 real_pthread_create(&th, nullptr, (void*(*)(void *arg))func, arg); 1733 internal_sigprocmask(SIG_SETMASK, &old, nullptr); 1734 return th; 1735 } 1736 1737 void internal_join_thread(void *th) { 1738 real_pthread_join(th, nullptr); 1739 } 1740 #else 1741 void *internal_start_thread(void (*func)(void *), void *arg) { return 0; } 1742 1743 void internal_join_thread(void *th) {} 1744 #endif 1745 1746 #if defined(__aarch64__) 1747 // Android headers in the older NDK releases miss this definition. 1748 struct __sanitizer_esr_context { 1749 struct _aarch64_ctx head; 1750 uint64_t esr; 1751 }; 1752 1753 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1754 static const u32 kEsrMagic = 0x45535201; 1755 u8 *aux = ucontext->uc_mcontext.__reserved; 1756 while (true) { 1757 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1758 if (ctx->size == 0) break; 1759 if (ctx->magic == kEsrMagic) { 1760 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1761 return true; 1762 } 1763 aux += ctx->size; 1764 } 1765 return false; 1766 } 1767 #endif 1768 1769 #if SANITIZER_OPENBSD 1770 using Context = sigcontext; 1771 #else 1772 using Context = ucontext_t; 1773 #endif 1774 1775 SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1776 Context *ucontext = (Context *)context; 1777 #if defined(__x86_64__) || defined(__i386__) 1778 static const uptr PF_WRITE = 1U << 1; 1779 #if SANITIZER_FREEBSD 1780 uptr err = ucontext->uc_mcontext.mc_err; 1781 #elif SANITIZER_NETBSD 1782 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1783 #elif SANITIZER_OPENBSD 1784 uptr err = ucontext->sc_err; 1785 #elif SANITIZER_SOLARIS && defined(__i386__) 1786 const int Err = 13; 1787 uptr err = ucontext->uc_mcontext.gregs[Err]; 1788 #else 1789 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1790 #endif // SANITIZER_FREEBSD 1791 return err & PF_WRITE ? WRITE : READ; 1792 #elif defined(__mips__) 1793 uint32_t *exception_source; 1794 uint32_t faulty_instruction; 1795 uint32_t op_code; 1796 1797 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 1798 faulty_instruction = (uint32_t)(*exception_source); 1799 1800 op_code = (faulty_instruction >> 26) & 0x3f; 1801 1802 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 1803 switch (op_code) { 1804 case 0x28: // sb 1805 case 0x29: // sh 1806 case 0x2b: // sw 1807 case 0x3f: // sd 1808 #if __mips_isa_rev < 6 1809 case 0x2c: // sdl 1810 case 0x2d: // sdr 1811 case 0x2a: // swl 1812 case 0x2e: // swr 1813 #endif 1814 return SignalContext::WRITE; 1815 1816 case 0x20: // lb 1817 case 0x24: // lbu 1818 case 0x21: // lh 1819 case 0x25: // lhu 1820 case 0x23: // lw 1821 case 0x27: // lwu 1822 case 0x37: // ld 1823 #if __mips_isa_rev < 6 1824 case 0x1a: // ldl 1825 case 0x1b: // ldr 1826 case 0x22: // lwl 1827 case 0x26: // lwr 1828 #endif 1829 return SignalContext::READ; 1830 #if __mips_isa_rev == 6 1831 case 0x3b: // pcrel 1832 op_code = (faulty_instruction >> 19) & 0x3; 1833 switch (op_code) { 1834 case 0x1: // lwpc 1835 case 0x2: // lwupc 1836 return SignalContext::READ; 1837 } 1838 #endif 1839 } 1840 return SignalContext::UNKNOWN; 1841 #elif defined(__arm__) 1842 static const uptr FSR_WRITE = 1U << 11; 1843 uptr fsr = ucontext->uc_mcontext.error_code; 1844 return fsr & FSR_WRITE ? WRITE : READ; 1845 #elif defined(__aarch64__) 1846 static const u64 ESR_ELx_WNR = 1U << 6; 1847 u64 esr; 1848 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN; 1849 return esr & ESR_ELx_WNR ? WRITE : READ; 1850 #elif SANITIZER_SOLARIS && defined(__sparc__) 1851 // Decode the instruction to determine the access type. 1852 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 1853 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 1854 u32 instr = *(u32 *)pc; 1855 return (instr >> 21) & 1 ? WRITE: READ; 1856 #else 1857 (void)ucontext; 1858 return UNKNOWN; // FIXME: Implement. 1859 #endif 1860 } 1861 1862 void SignalContext::DumpAllRegisters(void *context) { 1863 // FIXME: Implement this. 1864 } 1865 1866 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 1867 #if SANITIZER_NETBSD 1868 // This covers all NetBSD architectures 1869 ucontext_t *ucontext = (ucontext_t *)context; 1870 *pc = _UC_MACHINE_PC(ucontext); 1871 *bp = _UC_MACHINE_FP(ucontext); 1872 *sp = _UC_MACHINE_SP(ucontext); 1873 #elif defined(__arm__) 1874 ucontext_t *ucontext = (ucontext_t*)context; 1875 *pc = ucontext->uc_mcontext.arm_pc; 1876 *bp = ucontext->uc_mcontext.arm_fp; 1877 *sp = ucontext->uc_mcontext.arm_sp; 1878 #elif defined(__aarch64__) 1879 ucontext_t *ucontext = (ucontext_t*)context; 1880 *pc = ucontext->uc_mcontext.pc; 1881 *bp = ucontext->uc_mcontext.regs[29]; 1882 *sp = ucontext->uc_mcontext.sp; 1883 #elif defined(__hppa__) 1884 ucontext_t *ucontext = (ucontext_t*)context; 1885 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 1886 /* GCC uses %r3 whenever a frame pointer is needed. */ 1887 *bp = ucontext->uc_mcontext.sc_gr[3]; 1888 *sp = ucontext->uc_mcontext.sc_gr[30]; 1889 #elif defined(__x86_64__) 1890 # if SANITIZER_FREEBSD 1891 ucontext_t *ucontext = (ucontext_t*)context; 1892 *pc = ucontext->uc_mcontext.mc_rip; 1893 *bp = ucontext->uc_mcontext.mc_rbp; 1894 *sp = ucontext->uc_mcontext.mc_rsp; 1895 #elif SANITIZER_OPENBSD 1896 sigcontext *ucontext = (sigcontext *)context; 1897 *pc = ucontext->sc_rip; 1898 *bp = ucontext->sc_rbp; 1899 *sp = ucontext->sc_rsp; 1900 # else 1901 ucontext_t *ucontext = (ucontext_t*)context; 1902 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 1903 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 1904 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 1905 # endif 1906 #elif defined(__i386__) 1907 # if SANITIZER_FREEBSD 1908 ucontext_t *ucontext = (ucontext_t*)context; 1909 *pc = ucontext->uc_mcontext.mc_eip; 1910 *bp = ucontext->uc_mcontext.mc_ebp; 1911 *sp = ucontext->uc_mcontext.mc_esp; 1912 #elif SANITIZER_OPENBSD 1913 sigcontext *ucontext = (sigcontext *)context; 1914 *pc = ucontext->sc_eip; 1915 *bp = ucontext->sc_ebp; 1916 *sp = ucontext->sc_esp; 1917 # else 1918 ucontext_t *ucontext = (ucontext_t*)context; 1919 # if SANITIZER_SOLARIS 1920 /* Use the numeric values: the symbolic ones are undefined by llvm 1921 include/llvm/Support/Solaris.h. */ 1922 # ifndef REG_EIP 1923 # define REG_EIP 14 // REG_PC 1924 # endif 1925 # ifndef REG_EBP 1926 # define REG_EBP 6 // REG_FP 1927 # endif 1928 # ifndef REG_ESP 1929 # define REG_ESP 17 // REG_SP 1930 # endif 1931 # endif 1932 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 1933 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 1934 *sp = ucontext->uc_mcontext.gregs[REG_ESP]; 1935 # endif 1936 #elif defined(__powerpc__) || defined(__powerpc64__) 1937 ucontext_t *ucontext = (ucontext_t*)context; 1938 *pc = ucontext->uc_mcontext.regs->nip; 1939 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 1940 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 1941 // pointer, but GCC always uses r31 when we need a frame pointer. 1942 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 1943 #elif defined(__sparc__) 1944 ucontext_t *ucontext = (ucontext_t*)context; 1945 uptr *stk_ptr; 1946 # if defined(__sparcv9) || defined (__arch64__) 1947 # ifndef MC_PC 1948 # define MC_PC REG_PC 1949 # endif 1950 # ifndef MC_O6 1951 # define MC_O6 REG_O6 1952 # endif 1953 # if SANITIZER_SOLARIS 1954 # define mc_gregs gregs 1955 # endif 1956 *pc = ucontext->uc_mcontext.mc_gregs[MC_PC]; 1957 *sp = ucontext->uc_mcontext.mc_gregs[MC_O6]; 1958 stk_ptr = (uptr *) (*sp + 2047); 1959 *bp = stk_ptr[15]; 1960 # else 1961 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 1962 *sp = ucontext->uc_mcontext.gregs[REG_O6]; 1963 stk_ptr = (uptr *) *sp; 1964 *bp = stk_ptr[15]; 1965 # endif 1966 #elif defined(__mips__) 1967 ucontext_t *ucontext = (ucontext_t*)context; 1968 *pc = ucontext->uc_mcontext.pc; 1969 *bp = ucontext->uc_mcontext.gregs[30]; 1970 *sp = ucontext->uc_mcontext.gregs[29]; 1971 #elif defined(__s390__) 1972 ucontext_t *ucontext = (ucontext_t*)context; 1973 # if defined(__s390x__) 1974 *pc = ucontext->uc_mcontext.psw.addr; 1975 # else 1976 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 1977 # endif 1978 *bp = ucontext->uc_mcontext.gregs[11]; 1979 *sp = ucontext->uc_mcontext.gregs[15]; 1980 #else 1981 # error "Unsupported arch" 1982 #endif 1983 } 1984 1985 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 1986 1987 void InitializePlatformEarly() { 1988 // Do nothing. 1989 } 1990 1991 void MaybeReexec() { 1992 // No need to re-exec on Linux. 1993 } 1994 1995 void CheckASLR() { 1996 #if SANITIZER_NETBSD 1997 int mib[3]; 1998 int paxflags; 1999 uptr len = sizeof(paxflags); 2000 2001 mib[0] = CTL_PROC; 2002 mib[1] = internal_getpid(); 2003 mib[2] = PROC_PID_PAXFLAGS; 2004 2005 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2006 Printf("sysctl failed\n"); 2007 Die(); 2008 } 2009 2010 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2011 Printf("This sanitizer is not compatible with enabled ASLR\n"); 2012 Die(); 2013 } 2014 #elif SANITIZER_PPC64V2 2015 // Disable ASLR for Linux PPC64LE. 2016 int old_personality = personality(0xffffffff); 2017 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2018 VReport(1, "WARNING: Program is being run with address space layout " 2019 "randomization (ASLR) enabled which prevents the thread and " 2020 "memory sanitizers from working on powerpc64le.\n" 2021 "ASLR will be disabled and the program re-executed.\n"); 2022 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2023 ReExec(); 2024 } 2025 #else 2026 // Do nothing 2027 #endif 2028 } 2029 2030 void CheckMPROTECT() { 2031 #if SANITIZER_NETBSD 2032 int mib[3]; 2033 int paxflags; 2034 uptr len = sizeof(paxflags); 2035 2036 mib[0] = CTL_PROC; 2037 mib[1] = internal_getpid(); 2038 mib[2] = PROC_PID_PAXFLAGS; 2039 2040 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2041 Printf("sysctl failed\n"); 2042 Die(); 2043 } 2044 2045 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2046 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2047 Die(); 2048 } 2049 #else 2050 // Do nothing 2051 #endif 2052 } 2053 2054 void PrintModuleMap() { } 2055 2056 void CheckNoDeepBind(const char *filename, int flag) { 2057 #ifdef RTLD_DEEPBIND 2058 if (flag & RTLD_DEEPBIND) { 2059 Report( 2060 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2061 " which is incompatibe with sanitizer runtime " 2062 "(see https://github.com/google/sanitizers/issues/611 for details" 2063 "). If you want to run %s library under sanitizers please remove " 2064 "RTLD_DEEPBIND from dlopen flags.\n", 2065 filename, filename); 2066 Die(); 2067 } 2068 #endif 2069 } 2070 2071 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2072 uptr *largest_gap_found, 2073 uptr *max_occupied_addr) { 2074 UNREACHABLE("FindAvailableMemoryRange is not available"); 2075 return 0; 2076 } 2077 2078 bool GetRandom(void *buffer, uptr length, bool blocking) { 2079 if (!buffer || !length || length > 256) 2080 return false; 2081 #if SANITIZER_USE_GETENTROPY 2082 uptr rnd = getentropy(buffer, length); 2083 int rverrno = 0; 2084 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2085 return false; 2086 else if (rnd == 0) 2087 return true; 2088 #endif // SANITIZER_USE_GETENTROPY 2089 2090 #if SANITIZER_USE_GETRANDOM 2091 static atomic_uint8_t skip_getrandom_syscall; 2092 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2093 // Up to 256 bytes, getrandom will not be interrupted. 2094 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2095 blocking ? 0 : GRND_NONBLOCK); 2096 int rverrno = 0; 2097 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2098 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2099 else if (res == length) 2100 return true; 2101 } 2102 #endif // SANITIZER_USE_GETRANDOM 2103 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2104 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2105 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2106 if (internal_iserror(fd)) 2107 return false; 2108 uptr res = internal_read(fd, buffer, length); 2109 if (internal_iserror(res)) 2110 return false; 2111 internal_close(fd); 2112 return true; 2113 } 2114 2115 } // namespace __sanitizer 2116 2117 #endif 2118
Indexes created Sat Sep 20 22:09:52 GMT 2025