1 //===-- sanitizer_linux.cpp -----------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is shared between AddressSanitizer and ThreadSanitizer 10 // run-time libraries and implements linux-specific functions from 11 // sanitizer_libc.h. 12 //===----------------------------------------------------------------------===// 13 14 #include "sanitizer_platform.h" 15 16 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \ 17 SANITIZER_SOLARIS 18 19 #include "sanitizer_common.h" 20 #include "sanitizer_flags.h" 21 #include "sanitizer_getauxval.h" 22 #include "sanitizer_internal_defs.h" 23 #include "sanitizer_libc.h" 24 #include "sanitizer_linux.h" 25 #include "sanitizer_mutex.h" 26 #include "sanitizer_placement_new.h" 27 #include "sanitizer_procmaps.h" 28 29 #if SANITIZER_LINUX && !SANITIZER_GO 30 #include <asm/param.h> 31 #endif 32 33 // For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat' 34 // format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To 35 // access stat from asm/stat.h, without conflicting with definition in 36 // sys/stat.h, we use this trick. 37 #if SANITIZER_MIPS64 38 #include <asm/unistd.h> 39 #include <sys/types.h> 40 #define stat kernel_stat 41 #if SANITIZER_GO 42 #undef st_atime 43 #undef st_mtime 44 #undef st_ctime 45 #define st_atime st_atim 46 #define st_mtime st_mtim 47 #define st_ctime st_ctim 48 #endif 49 #include <asm/stat.h> 50 #undef stat 51 #endif 52 53 #include <dlfcn.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <link.h> 57 #include <pthread.h> 58 #include <sched.h> 59 #include <signal.h> 60 #include <sys/mman.h> 61 #include <sys/param.h> 62 #if !SANITIZER_SOLARIS 63 #include <sys/ptrace.h> 64 #endif 65 #include <sys/resource.h> 66 #include <sys/stat.h> 67 #include <sys/syscall.h> 68 #include <sys/time.h> 69 #include <sys/types.h> 70 #include <ucontext.h> 71 #include <unistd.h> 72 73 #if SANITIZER_LINUX 74 #include <sys/utsname.h> 75 #endif 76 77 #if SANITIZER_LINUX && !SANITIZER_ANDROID 78 #include <sys/personality.h> 79 #endif 80 81 #if SANITIZER_FREEBSD 82 #include <sys/exec.h> 83 #include <sys/procctl.h> 84 #include <sys/sysctl.h> 85 #include <machine/atomic.h> 86 extern "C" { 87 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on 88 // FreeBSD 9.2 and 10.0. 89 #include <sys/umtx.h> 90 } 91 #include <sys/thr.h> 92 #endif // SANITIZER_FREEBSD 93 94 #if SANITIZER_NETBSD 95 #include <limits.h> // For NAME_MAX 96 #include <sys/sysctl.h> 97 #include <sys/exec.h> 98 extern struct ps_strings *__ps_strings; 99 #endif // SANITIZER_NETBSD 100 101 #if SANITIZER_SOLARIS 102 #include <stdlib.h> 103 #include <thread.h> 104 #define environ _environ 105 #endif 106 107 extern char **environ; 108 109 #if SANITIZER_LINUX 110 // <linux/time.h> 111 struct kernel_timeval { 112 long tv_sec; 113 long tv_usec; 114 }; 115 116 // <linux/futex.h> is broken on some linux distributions. 117 const int FUTEX_WAIT = 0; 118 const int FUTEX_WAKE = 1; 119 const int FUTEX_PRIVATE_FLAG = 128; 120 const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; 121 const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; 122 #endif // SANITIZER_LINUX 123 124 // Are we using 32-bit or 64-bit Linux syscalls? 125 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 126 // but it still needs to use 64-bit syscalls. 127 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \ 128 SANITIZER_WORDSIZE == 64 || \ 129 (defined(__mips__) && _MIPS_SIM == _ABIN32)) 130 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 131 #else 132 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 133 #endif 134 135 // Note : FreeBSD had implemented both 136 // Linux apis, available from 137 // future 12.x version most likely 138 #if SANITIZER_LINUX && defined(__NR_getrandom) 139 # if !defined(GRND_NONBLOCK) 140 # define GRND_NONBLOCK 1 141 # endif 142 # define SANITIZER_USE_GETRANDOM 1 143 #else 144 # define SANITIZER_USE_GETRANDOM 0 145 #endif // SANITIZER_LINUX && defined(__NR_getrandom) 146 147 #if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000 148 # define SANITIZER_USE_GETENTROPY 1 149 #else 150 # define SANITIZER_USE_GETENTROPY 0 151 #endif 152 153 namespace __sanitizer { 154 155 void SetSigProcMask(__sanitizer_sigset_t *set, __sanitizer_sigset_t *old) { 156 CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, set, old)); 157 } 158 159 ScopedBlockSignals::ScopedBlockSignals(__sanitizer_sigset_t *copy) { 160 __sanitizer_sigset_t set; 161 internal_sigfillset(&set); 162 # if SANITIZER_LINUX && !SANITIZER_ANDROID 163 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 164 // on any thread, setuid call hangs. 165 // See test/sanitizer_common/TestCases/Linux/setuid.c. 166 internal_sigdelset(&set, 33); 167 # endif 168 # if SANITIZER_LINUX 169 // Seccomp-BPF-sandboxed processes rely on SIGSYS to handle trapped syscalls. 170 // If this signal is blocked, such calls cannot be handled and the process may 171 // hang. 172 internal_sigdelset(&set, 31); 173 # endif 174 SetSigProcMask(&set, &saved_); 175 if (copy) 176 internal_memcpy(copy, &saved_, sizeof(saved_)); 177 } 178 179 ScopedBlockSignals::~ScopedBlockSignals() { SetSigProcMask(&saved_, nullptr); } 180 181 # if SANITIZER_LINUX && defined(__x86_64__) 182 # include "sanitizer_syscall_linux_x86_64.inc" 183 # elif SANITIZER_LINUX && SANITIZER_RISCV64 184 # include "sanitizer_syscall_linux_riscv64.inc" 185 # elif SANITIZER_LINUX && defined(__aarch64__) 186 # include "sanitizer_syscall_linux_aarch64.inc" 187 # elif SANITIZER_LINUX && defined(__arm__) 188 # include "sanitizer_syscall_linux_arm.inc" 189 # elif SANITIZER_LINUX && defined(__hexagon__) 190 # include "sanitizer_syscall_linux_hexagon.inc" 191 # else 192 # include "sanitizer_syscall_generic.inc" 193 # endif 194 195 // --------------- sanitizer_libc.h 196 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 197 #if !SANITIZER_S390 198 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd, 199 u64 offset) { 200 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 201 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd, 202 offset); 203 #else 204 // mmap2 specifies file offset in 4096-byte units. 205 CHECK(IsAligned(offset, 4096)); 206 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd, 207 offset / 4096); 208 #endif 209 } 210 #endif // !SANITIZER_S390 211 212 uptr internal_munmap(void *addr, uptr length) { 213 return internal_syscall(SYSCALL(munmap), (uptr)addr, length); 214 } 215 216 #if SANITIZER_LINUX 217 uptr internal_mremap(void *old_address, uptr old_size, uptr new_size, int flags, 218 void *new_address) { 219 return internal_syscall(SYSCALL(mremap), (uptr)old_address, old_size, 220 new_size, flags, (uptr)new_address); 221 } 222 #endif 223 224 int internal_mprotect(void *addr, uptr length, int prot) { 225 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot); 226 } 227 228 int internal_madvise(uptr addr, uptr length, int advice) { 229 return internal_syscall(SYSCALL(madvise), addr, length, advice); 230 } 231 232 uptr internal_close(fd_t fd) { 233 return internal_syscall(SYSCALL(close), fd); 234 } 235 236 uptr internal_open(const char *filename, int flags) { 237 # if SANITIZER_LINUX 238 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags); 239 #else 240 return internal_syscall(SYSCALL(open), (uptr)filename, flags); 241 #endif 242 } 243 244 uptr internal_open(const char *filename, int flags, u32 mode) { 245 # if SANITIZER_LINUX 246 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags, 247 mode); 248 #else 249 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode); 250 #endif 251 } 252 253 uptr internal_read(fd_t fd, void *buf, uptr count) { 254 sptr res; 255 HANDLE_EINTR(res, 256 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)); 257 return res; 258 } 259 260 uptr internal_write(fd_t fd, const void *buf, uptr count) { 261 sptr res; 262 HANDLE_EINTR(res, 263 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)); 264 return res; 265 } 266 267 uptr internal_ftruncate(fd_t fd, uptr size) { 268 sptr res; 269 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd, 270 (OFF_T)size)); 271 return res; 272 } 273 274 #if (!SANITIZER_LINUX_USES_64BIT_SYSCALLS || SANITIZER_SPARC) && SANITIZER_LINUX 275 static void stat64_to_stat(struct stat64 *in, struct stat *out) { 276 internal_memset(out, 0, sizeof(*out)); 277 out->st_dev = in->st_dev; 278 out->st_ino = in->st_ino; 279 out->st_mode = in->st_mode; 280 out->st_nlink = in->st_nlink; 281 out->st_uid = in->st_uid; 282 out->st_gid = in->st_gid; 283 out->st_rdev = in->st_rdev; 284 out->st_size = in->st_size; 285 out->st_blksize = in->st_blksize; 286 out->st_blocks = in->st_blocks; 287 out->st_atime = in->st_atime; 288 out->st_mtime = in->st_mtime; 289 out->st_ctime = in->st_ctime; 290 } 291 #endif 292 293 #if SANITIZER_MIPS64 294 // Undefine compatibility macros from <sys/stat.h> 295 // so that they would not clash with the kernel_stat 296 // st_[a|m|c]time fields 297 #if !SANITIZER_GO 298 #undef st_atime 299 #undef st_mtime 300 #undef st_ctime 301 #endif 302 #if defined(SANITIZER_ANDROID) 303 // Bionic sys/stat.h defines additional macros 304 // for compatibility with the old NDKs and 305 // they clash with the kernel_stat structure 306 // st_[a|m|c]time_nsec fields. 307 #undef st_atime_nsec 308 #undef st_mtime_nsec 309 #undef st_ctime_nsec 310 #endif 311 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) { 312 internal_memset(out, 0, sizeof(*out)); 313 out->st_dev = in->st_dev; 314 out->st_ino = in->st_ino; 315 out->st_mode = in->st_mode; 316 out->st_nlink = in->st_nlink; 317 out->st_uid = in->st_uid; 318 out->st_gid = in->st_gid; 319 out->st_rdev = in->st_rdev; 320 out->st_size = in->st_size; 321 out->st_blksize = in->st_blksize; 322 out->st_blocks = in->st_blocks; 323 #if defined(__USE_MISC) || \ 324 defined(__USE_XOPEN2K8) || \ 325 defined(SANITIZER_ANDROID) 326 out->st_atim.tv_sec = in->st_atime; 327 out->st_atim.tv_nsec = in->st_atime_nsec; 328 out->st_mtim.tv_sec = in->st_mtime; 329 out->st_mtim.tv_nsec = in->st_mtime_nsec; 330 out->st_ctim.tv_sec = in->st_ctime; 331 out->st_ctim.tv_nsec = in->st_ctime_nsec; 332 #else 333 out->st_atime = in->st_atime; 334 out->st_atimensec = in->st_atime_nsec; 335 out->st_mtime = in->st_mtime; 336 out->st_mtimensec = in->st_mtime_nsec; 337 out->st_ctime = in->st_ctime; 338 out->st_atimensec = in->st_ctime_nsec; 339 #endif 340 } 341 #endif 342 343 uptr internal_stat(const char *path, void *buf) { 344 #if SANITIZER_FREEBSD 345 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0); 346 # elif SANITIZER_LINUX 347 # if (SANITIZER_WORDSIZE == 64 || SANITIZER_X32 || \ 348 (defined(__mips__) && _MIPS_SIM == _ABIN32)) && \ 349 !SANITIZER_SPARC 350 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 351 0); 352 # else 353 struct stat64 buf64; 354 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 355 (uptr)&buf64, 0); 356 stat64_to_stat(&buf64, (struct stat *)buf); 357 return res; 358 # endif 359 # else 360 struct stat64 buf64; 361 int res = internal_syscall(SYSCALL(stat64), path, &buf64); 362 stat64_to_stat(&buf64, (struct stat *)buf); 363 return res; 364 # endif 365 } 366 367 uptr internal_lstat(const char *path, void *buf) { 368 #if SANITIZER_FREEBSD 369 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 370 AT_SYMLINK_NOFOLLOW); 371 # elif SANITIZER_LINUX 372 # if (defined(_LP64) || SANITIZER_X32 || \ 373 (defined(__mips__) && _MIPS_SIM == _ABIN32)) && \ 374 !SANITIZER_SPARC 375 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 376 AT_SYMLINK_NOFOLLOW); 377 # else 378 struct stat64 buf64; 379 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 380 (uptr)&buf64, AT_SYMLINK_NOFOLLOW); 381 stat64_to_stat(&buf64, (struct stat *)buf); 382 return res; 383 # endif 384 # else 385 struct stat64 buf64; 386 int res = internal_syscall(SYSCALL(lstat64), path, &buf64); 387 stat64_to_stat(&buf64, (struct stat *)buf); 388 return res; 389 # endif 390 } 391 392 uptr internal_fstat(fd_t fd, void *buf) { 393 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 394 #if SANITIZER_MIPS64 395 // For mips64, fstat syscall fills buffer in the format of kernel_stat 396 struct kernel_stat kbuf; 397 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf); 398 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 399 return res; 400 # else 401 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf); 402 # endif 403 #else 404 struct stat64 buf64; 405 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64); 406 stat64_to_stat(&buf64, (struct stat *)buf); 407 return res; 408 #endif 409 } 410 411 uptr internal_filesize(fd_t fd) { 412 struct stat st; 413 if (internal_fstat(fd, &st)) 414 return -1; 415 return (uptr)st.st_size; 416 } 417 418 uptr internal_dup(int oldfd) { 419 return internal_syscall(SYSCALL(dup), oldfd); 420 } 421 422 uptr internal_dup2(int oldfd, int newfd) { 423 # if SANITIZER_LINUX 424 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0); 425 #else 426 return internal_syscall(SYSCALL(dup2), oldfd, newfd); 427 #endif 428 } 429 430 uptr internal_readlink(const char *path, char *buf, uptr bufsize) { 431 # if SANITIZER_LINUX 432 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 433 bufsize); 434 #else 435 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize); 436 #endif 437 } 438 439 uptr internal_unlink(const char *path) { 440 # if SANITIZER_LINUX 441 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0); 442 #else 443 return internal_syscall(SYSCALL(unlink), (uptr)path); 444 #endif 445 } 446 447 uptr internal_rename(const char *oldpath, const char *newpath) { 448 #if defined(__riscv) && defined(__linux__) 449 return internal_syscall(SYSCALL(renameat2), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 450 (uptr)newpath, 0); 451 # elif SANITIZER_LINUX 452 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 453 (uptr)newpath); 454 # else 455 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath); 456 # endif 457 } 458 459 uptr internal_sched_yield() { 460 return internal_syscall(SYSCALL(sched_yield)); 461 } 462 463 void internal_usleep(u64 useconds) { 464 struct timespec ts; 465 ts.tv_sec = useconds / 1000000; 466 ts.tv_nsec = (useconds % 1000000) * 1000; 467 internal_syscall(SYSCALL(nanosleep), &ts, &ts); 468 } 469 470 uptr internal_execve(const char *filename, char *const argv[], 471 char *const envp[]) { 472 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, 473 (uptr)envp); 474 } 475 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 476 477 #if !SANITIZER_NETBSD 478 void internal__exit(int exitcode) { 479 #if SANITIZER_FREEBSD || SANITIZER_SOLARIS 480 internal_syscall(SYSCALL(exit), exitcode); 481 #else 482 internal_syscall(SYSCALL(exit_group), exitcode); 483 #endif 484 Die(); // Unreachable. 485 } 486 #endif // !SANITIZER_NETBSD 487 488 // ----------------- sanitizer_common.h 489 bool FileExists(const char *filename) { 490 if (ShouldMockFailureToOpen(filename)) 491 return false; 492 struct stat st; 493 if (internal_stat(filename, &st)) 494 return false; 495 // Sanity check: filename is a regular file. 496 return S_ISREG(st.st_mode); 497 } 498 499 bool DirExists(const char *path) { 500 struct stat st; 501 if (internal_stat(path, &st)) 502 return false; 503 return S_ISDIR(st.st_mode); 504 } 505 506 # if !SANITIZER_NETBSD 507 tid_t GetTid() { 508 #if SANITIZER_FREEBSD 509 long Tid; 510 thr_self(&Tid); 511 return Tid; 512 #elif SANITIZER_SOLARIS 513 return thr_self(); 514 #else 515 return internal_syscall(SYSCALL(gettid)); 516 #endif 517 } 518 519 int TgKill(pid_t pid, tid_t tid, int sig) { 520 #if SANITIZER_LINUX 521 return internal_syscall(SYSCALL(tgkill), pid, tid, sig); 522 #elif SANITIZER_FREEBSD 523 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig); 524 #elif SANITIZER_SOLARIS 525 (void)pid; 526 return thr_kill(tid, sig); 527 #endif 528 } 529 #endif 530 531 #if SANITIZER_GLIBC 532 u64 NanoTime() { 533 kernel_timeval tv; 534 internal_memset(&tv, 0, sizeof(tv)); 535 internal_syscall(SYSCALL(gettimeofday), &tv, 0); 536 return (u64)tv.tv_sec * 1000 * 1000 * 1000 + tv.tv_usec * 1000; 537 } 538 // Used by real_clock_gettime. 539 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) { 540 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp); 541 } 542 #elif !SANITIZER_SOLARIS && !SANITIZER_NETBSD 543 u64 NanoTime() { 544 struct timespec ts; 545 clock_gettime(CLOCK_REALTIME, &ts); 546 return (u64)ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec; 547 } 548 #endif 549 550 // Like getenv, but reads env directly from /proc (on Linux) or parses the 551 // 'environ' array (on some others) and does not use libc. This function 552 // should be called first inside __asan_init. 553 const char *GetEnv(const char *name) { 554 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_SOLARIS 555 if (::environ != 0) { 556 uptr NameLen = internal_strlen(name); 557 for (char **Env = ::environ; *Env != 0; Env++) { 558 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=') 559 return (*Env) + NameLen + 1; 560 } 561 } 562 return 0; // Not found. 563 #elif SANITIZER_LINUX 564 static char *environ; 565 static uptr len; 566 static bool inited; 567 if (!inited) { 568 inited = true; 569 uptr environ_size; 570 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len)) 571 environ = nullptr; 572 } 573 if (!environ || len == 0) return nullptr; 574 uptr namelen = internal_strlen(name); 575 const char *p = environ; 576 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 577 // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 578 const char* endp = 579 (char*)internal_memchr(p, '\0', len - (p - environ)); 580 if (!endp) // this entry isn't NUL terminated 581 return nullptr; 582 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 583 return p + namelen + 1; // point after = 584 p = endp + 1; 585 } 586 return nullptr; // Not found. 587 #else 588 #error "Unsupported platform" 589 #endif 590 } 591 592 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_GO 593 extern "C" { 594 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 595 } 596 #endif 597 598 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 599 static void ReadNullSepFileToArray(const char *path, char ***arr, 600 int arr_size) { 601 char *buff; 602 uptr buff_size; 603 uptr buff_len; 604 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 605 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 606 (*arr)[0] = nullptr; 607 return; 608 } 609 (*arr)[0] = buff; 610 int count, i; 611 for (count = 1, i = 1; ; i++) { 612 if (buff[i] == 0) { 613 if (buff[i+1] == 0) break; 614 (*arr)[count] = &buff[i+1]; 615 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 616 count++; 617 } 618 } 619 (*arr)[count] = nullptr; 620 } 621 #endif 622 623 static void GetArgsAndEnv(char ***argv, char ***envp) { 624 #if SANITIZER_FREEBSD 625 // On FreeBSD, retrieving the argument and environment arrays is done via the 626 // kern.ps_strings sysctl, which returns a pointer to a structure containing 627 // this information. See also <sys/exec.h>. 628 ps_strings *pss; 629 uptr sz = sizeof(pss); 630 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 631 Printf("sysctl kern.ps_strings failed\n"); 632 Die(); 633 } 634 *argv = pss->ps_argvstr; 635 *envp = pss->ps_envstr; 636 #elif SANITIZER_NETBSD 637 *argv = __ps_strings->ps_argvstr; 638 *envp = __ps_strings->ps_envstr; 639 #else // SANITIZER_FREEBSD 640 #if !SANITIZER_GO 641 if (&__libc_stack_end) { 642 uptr* stack_end = (uptr*)__libc_stack_end; 643 // Normally argc can be obtained from *stack_end, however, on ARM glibc's 644 // _start clobbers it: 645 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/start.S;hb=refs/heads/release/2.31/master#l75 646 // Do not special-case ARM and infer argc from argv everywhere. 647 int argc = 0; 648 while (stack_end[argc + 1]) argc++; 649 *argv = (char**)(stack_end + 1); 650 *envp = (char**)(stack_end + argc + 2); 651 } else { 652 #endif // !SANITIZER_GO 653 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 654 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 655 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 656 #if !SANITIZER_GO 657 } 658 #endif // !SANITIZER_GO 659 #endif // SANITIZER_FREEBSD 660 } 661 662 char **GetArgv() { 663 char **argv, **envp; 664 GetArgsAndEnv(&argv, &envp); 665 return argv; 666 } 667 668 char **GetEnviron() { 669 char **argv, **envp; 670 GetArgsAndEnv(&argv, &envp); 671 return envp; 672 } 673 674 #if !SANITIZER_SOLARIS 675 void FutexWait(atomic_uint32_t *p, u32 cmp) { 676 # if SANITIZER_FREEBSD 677 _umtx_op(p, UMTX_OP_WAIT_UINT, cmp, 0, 0); 678 # elif SANITIZER_NETBSD 679 sched_yield(); /* No userspace futex-like synchronization */ 680 # else 681 internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAIT_PRIVATE, cmp, 0, 0, 0); 682 # endif 683 } 684 685 void FutexWake(atomic_uint32_t *p, u32 count) { 686 # if SANITIZER_FREEBSD 687 _umtx_op(p, UMTX_OP_WAKE, count, 0, 0); 688 # elif SANITIZER_NETBSD 689 /* No userspace futex-like synchronization */ 690 # else 691 internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAKE_PRIVATE, count, 0, 0, 0); 692 # endif 693 } 694 695 # endif // !SANITIZER_SOLARIS 696 697 // ----------------- sanitizer_linux.h 698 // The actual size of this structure is specified by d_reclen. 699 // Note that getdents64 uses a different structure format. We only provide the 700 // 32-bit syscall here. 701 #if SANITIZER_NETBSD 702 // Not used 703 #else 704 struct linux_dirent { 705 # if SANITIZER_X32 || SANITIZER_LINUX 706 u64 d_ino; 707 u64 d_off; 708 # else 709 unsigned long d_ino; 710 unsigned long d_off; 711 # endif 712 unsigned short d_reclen; 713 # if SANITIZER_LINUX 714 unsigned char d_type; 715 # endif 716 char d_name[256]; 717 }; 718 #endif 719 720 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 721 // Syscall wrappers. 722 uptr internal_ptrace(int request, int pid, void *addr, void *data) { 723 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 724 (uptr)data); 725 } 726 727 uptr internal_waitpid(int pid, int *status, int options) { 728 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 729 0 /* rusage */); 730 } 731 732 uptr internal_getpid() { 733 return internal_syscall(SYSCALL(getpid)); 734 } 735 736 uptr internal_getppid() { 737 return internal_syscall(SYSCALL(getppid)); 738 } 739 740 int internal_dlinfo(void *handle, int request, void *p) { 741 #if SANITIZER_FREEBSD 742 return dlinfo(handle, request, p); 743 #else 744 UNIMPLEMENTED(); 745 #endif 746 } 747 748 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 749 #if SANITIZER_FREEBSD 750 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 751 # elif SANITIZER_LINUX 752 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 753 # else 754 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 755 # endif 756 } 757 758 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 759 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 760 } 761 762 #if SANITIZER_LINUX 763 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 764 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 765 } 766 # if defined(__x86_64__) 767 #include <asm/unistd_64.h> 768 // Currently internal_arch_prctl() is only needed on x86_64. 769 uptr internal_arch_prctl(int option, uptr arg2) { 770 return internal_syscall(__NR_arch_prctl, option, arg2); 771 } 772 # endif 773 #endif 774 775 uptr internal_sigaltstack(const void *ss, void *oss) { 776 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 777 } 778 779 int internal_fork() { 780 # if SANITIZER_LINUX 781 # if SANITIZER_S390 782 return internal_syscall(SYSCALL(clone), 0, SIGCHLD); 783 # else 784 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 785 # endif 786 # else 787 return internal_syscall(SYSCALL(fork)); 788 # endif 789 } 790 791 #if SANITIZER_FREEBSD 792 int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 793 uptr *oldlenp, const void *newp, uptr newlen) { 794 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 795 (size_t *)oldlenp, newp, (size_t)newlen); 796 } 797 798 int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 799 const void *newp, uptr newlen) { 800 // Note: this function can be called during startup, so we need to avoid 801 // calling any interceptable functions. On FreeBSD >= 1300045 sysctlbyname() 802 // is a real syscall, but for older versions it calls sysctlnametomib() 803 // followed by sysctl(). To avoid calling the intercepted version and 804 // asserting if this happens during startup, call the real sysctlnametomib() 805 // followed by internal_sysctl() if the syscall is not available. 806 #ifdef SYS___sysctlbyname 807 return internal_syscall(SYSCALL(__sysctlbyname), sname, 808 internal_strlen(sname), oldp, (size_t *)oldlenp, newp, 809 (size_t)newlen); 810 #else 811 static decltype(sysctlnametomib) *real_sysctlnametomib = nullptr; 812 if (!real_sysctlnametomib) 813 real_sysctlnametomib = 814 (decltype(sysctlnametomib) *)dlsym(RTLD_NEXT, "sysctlnametomib"); 815 CHECK(real_sysctlnametomib); 816 817 int oid[CTL_MAXNAME]; 818 size_t len = CTL_MAXNAME; 819 if (real_sysctlnametomib(sname, oid, &len) == -1) 820 return (-1); 821 return internal_sysctl(oid, len, oldp, oldlenp, newp, newlen); 822 #endif 823 } 824 #endif 825 826 #if SANITIZER_LINUX 827 #define SA_RESTORER 0x04000000 828 // Doesn't set sa_restorer if the caller did not set it, so use with caution 829 //(see below). 830 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 831 __sanitizer_kernel_sigaction_t k_act, k_oldact; 832 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 833 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 834 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 835 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 836 if (u_act) { 837 k_act.handler = u_act->handler; 838 k_act.sigaction = u_act->sigaction; 839 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 840 sizeof(__sanitizer_kernel_sigset_t)); 841 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 842 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 843 // FIXME: most often sa_restorer is unset, however the kernel requires it 844 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 845 // If sa_restorer passed to the kernel is NULL, the program may crash upon 846 // signal delivery or fail to unwind the stack in the signal handler. 847 // libc implementation of sigaction() passes its own restorer to 848 // rt_sigaction, so we need to do the same (we'll need to reimplement the 849 // restorers; for x86_64 the restorer address can be obtained from 850 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 851 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 852 k_act.sa_restorer = u_act->sa_restorer; 853 #endif 854 } 855 856 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 857 (uptr)(u_act ? &k_act : nullptr), 858 (uptr)(u_oldact ? &k_oldact : nullptr), 859 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 860 861 if ((result == 0) && u_oldact) { 862 u_oldact->handler = k_oldact.handler; 863 u_oldact->sigaction = k_oldact.sigaction; 864 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 865 sizeof(__sanitizer_kernel_sigset_t)); 866 u_oldact->sa_flags = k_oldact.sa_flags; 867 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 868 u_oldact->sa_restorer = k_oldact.sa_restorer; 869 #endif 870 } 871 return result; 872 } 873 #endif // SANITIZER_LINUX 874 875 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 876 __sanitizer_sigset_t *oldset) { 877 #if SANITIZER_FREEBSD 878 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 879 #else 880 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 881 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 882 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, (uptr)k_set, 883 (uptr)k_oldset, sizeof(__sanitizer_kernel_sigset_t)); 884 #endif 885 } 886 887 void internal_sigfillset(__sanitizer_sigset_t *set) { 888 internal_memset(set, 0xff, sizeof(*set)); 889 } 890 891 void internal_sigemptyset(__sanitizer_sigset_t *set) { 892 internal_memset(set, 0, sizeof(*set)); 893 } 894 895 #if SANITIZER_LINUX 896 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 897 signum -= 1; 898 CHECK_GE(signum, 0); 899 CHECK_LT(signum, sizeof(*set) * 8); 900 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 901 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 902 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 903 k_set->sig[idx] &= ~((uptr)1 << bit); 904 } 905 906 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 907 signum -= 1; 908 CHECK_GE(signum, 0); 909 CHECK_LT(signum, sizeof(*set) * 8); 910 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 911 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 912 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 913 return k_set->sig[idx] & ((uptr)1 << bit); 914 } 915 #elif SANITIZER_FREEBSD 916 uptr internal_procctl(int type, int id, int cmd, void *data) { 917 return internal_syscall(SYSCALL(procctl), type, id, cmd, data); 918 } 919 920 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 921 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 922 sigdelset(rset, signum); 923 } 924 925 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 926 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 927 return sigismember(rset, signum); 928 } 929 #endif 930 #endif // !SANITIZER_SOLARIS 931 932 #if !SANITIZER_NETBSD 933 // ThreadLister implementation. 934 ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) { 935 char task_directory_path[80]; 936 internal_snprintf(task_directory_path, sizeof(task_directory_path), 937 "/proc/%d/task/", pid); 938 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 939 if (internal_iserror(descriptor_)) { 940 Report("Can't open /proc/%d/task for reading.\n", pid); 941 } 942 } 943 944 ThreadLister::Result ThreadLister::ListThreads( 945 InternalMmapVector<tid_t> *threads) { 946 if (internal_iserror(descriptor_)) 947 return Error; 948 internal_lseek(descriptor_, 0, SEEK_SET); 949 threads->clear(); 950 951 Result result = Ok; 952 for (bool first_read = true;; first_read = false) { 953 // Resize to max capacity if it was downsized by IsAlive. 954 buffer_.resize(buffer_.capacity()); 955 CHECK_GE(buffer_.size(), 4096); 956 uptr read = internal_getdents( 957 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size()); 958 if (!read) 959 return result; 960 if (internal_iserror(read)) { 961 Report("Can't read directory entries from /proc/%d/task.\n", pid_); 962 return Error; 963 } 964 965 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 966 struct linux_dirent *entry = (struct linux_dirent *)begin; 967 begin += entry->d_reclen; 968 if (entry->d_ino == 1) { 969 // Inode 1 is for bad blocks and also can be a reason for early return. 970 // Should be emitted if kernel tried to output terminating thread. 971 // See proc_task_readdir implementation in Linux. 972 result = Incomplete; 973 } 974 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 975 threads->push_back(internal_atoll(entry->d_name)); 976 } 977 978 // Now we are going to detect short-read or early EOF. In such cases Linux 979 // can return inconsistent list with missing alive threads. 980 // Code will just remember that the list can be incomplete but it will 981 // continue reads to return as much as possible. 982 if (!first_read) { 983 // The first one was a short-read by definition. 984 result = Incomplete; 985 } else if (read > buffer_.size() - 1024) { 986 // Read was close to the buffer size. So double the size and assume the 987 // worst. 988 buffer_.resize(buffer_.size() * 2); 989 result = Incomplete; 990 } else if (!threads->empty() && !IsAlive(threads->back())) { 991 // Maybe Linux early returned from read on terminated thread (!pid_alive) 992 // and failed to restore read position. 993 // See next_tid and proc_task_instantiate in Linux. 994 result = Incomplete; 995 } 996 } 997 } 998 999 bool ThreadLister::IsAlive(int tid) { 1000 // /proc/%d/task/%d/status uses same call to detect alive threads as 1001 // proc_task_readdir. See task_state implementation in Linux. 1002 char path[80]; 1003 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid); 1004 if (!ReadFileToVector(path, &buffer_) || buffer_.empty()) 1005 return false; 1006 buffer_.push_back(0); 1007 static const char kPrefix[] = "\nPPid:"; 1008 const char *field = internal_strstr(buffer_.data(), kPrefix); 1009 if (!field) 1010 return false; 1011 field += internal_strlen(kPrefix); 1012 return (int)internal_atoll(field) != 0; 1013 } 1014 1015 ThreadLister::~ThreadLister() { 1016 if (!internal_iserror(descriptor_)) 1017 internal_close(descriptor_); 1018 } 1019 #endif 1020 1021 #if SANITIZER_WORDSIZE == 32 1022 // Take care of unusable kernel area in top gigabyte. 1023 static uptr GetKernelAreaSize() { 1024 #if SANITIZER_LINUX && !SANITIZER_X32 1025 const uptr gbyte = 1UL << 30; 1026 1027 // Firstly check if there are writable segments 1028 // mapped to top gigabyte (e.g. stack). 1029 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 1030 if (proc_maps.Error()) 1031 return 0; 1032 MemoryMappedSegment segment; 1033 while (proc_maps.Next(&segment)) { 1034 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0; 1035 } 1036 1037 #if !SANITIZER_ANDROID 1038 // Even if nothing is mapped, top Gb may still be accessible 1039 // if we are running on 64-bit kernel. 1040 // Uname may report misleading results if personality type 1041 // is modified (e.g. under schroot) so check this as well. 1042 struct utsname uname_info; 1043 int pers = personality(0xffffffffUL); 1044 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 && 1045 internal_strstr(uname_info.machine, "64")) 1046 return 0; 1047 #endif // SANITIZER_ANDROID 1048 1049 // Top gigabyte is reserved for kernel. 1050 return gbyte; 1051 #else 1052 return 0; 1053 #endif // SANITIZER_LINUX && !SANITIZER_X32 1054 } 1055 #endif // SANITIZER_WORDSIZE == 32 1056 1057 uptr GetMaxVirtualAddress() { 1058 #if SANITIZER_NETBSD && defined(__x86_64__) 1059 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE) 1060 #elif SANITIZER_WORDSIZE == 64 1061 # if defined(__powerpc64__) || defined(__aarch64__) 1062 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 1063 // We somehow need to figure out which one we are using now and choose 1064 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 1065 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 1066 // of the address space, so simply checking the stack address is not enough. 1067 // This should (does) work for both PowerPC64 Endian modes. 1068 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit. 1069 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1; 1070 #elif SANITIZER_RISCV64 1071 return (1ULL << 38) - 1; 1072 # elif SANITIZER_MIPS64 1073 return (1ULL << 40) - 1; // 0x000000ffffffffffUL; 1074 # elif defined(__s390x__) 1075 return (1ULL << 53) - 1; // 0x001fffffffffffffUL; 1076 #elif defined(__sparc__) 1077 return ~(uptr)0; 1078 # else 1079 return (1ULL << 47) - 1; // 0x00007fffffffffffUL; 1080 # endif 1081 #else // SANITIZER_WORDSIZE == 32 1082 # if defined(__s390__) 1083 return (1ULL << 31) - 1; // 0x7fffffff; 1084 # else 1085 return (1ULL << 32) - 1; // 0xffffffff; 1086 # endif 1087 #endif // SANITIZER_WORDSIZE 1088 } 1089 1090 uptr GetMaxUserVirtualAddress() { 1091 uptr addr = GetMaxVirtualAddress(); 1092 #if SANITIZER_WORDSIZE == 32 && !defined(__s390__) 1093 if (!common_flags()->full_address_space) 1094 addr -= GetKernelAreaSize(); 1095 CHECK_LT(reinterpret_cast<uptr>(&addr), addr); 1096 #endif 1097 return addr; 1098 } 1099 1100 #if !SANITIZER_ANDROID 1101 uptr GetPageSize() { 1102 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) && \ 1103 defined(EXEC_PAGESIZE) 1104 return EXEC_PAGESIZE; 1105 #elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1106 // Use sysctl as sysconf can trigger interceptors internally. 1107 int pz = 0; 1108 uptr pzl = sizeof(pz); 1109 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1110 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1111 CHECK_EQ(rv, 0); 1112 return (uptr)pz; 1113 #elif SANITIZER_USE_GETAUXVAL 1114 return getauxval(AT_PAGESZ); 1115 #else 1116 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1117 #endif 1118 } 1119 #endif // !SANITIZER_ANDROID 1120 1121 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { 1122 #if SANITIZER_SOLARIS 1123 const char *default_module_name = getexecname(); 1124 CHECK_NE(default_module_name, NULL); 1125 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1126 #else 1127 #if SANITIZER_FREEBSD || SANITIZER_NETBSD 1128 #if SANITIZER_FREEBSD 1129 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1130 #else 1131 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1132 #endif 1133 const char *default_module_name = "kern.proc.pathname"; 1134 uptr Size = buf_len; 1135 bool IsErr = 1136 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1137 int readlink_error = IsErr ? errno : 0; 1138 uptr module_name_len = Size; 1139 #else 1140 const char *default_module_name = "/proc/self/exe"; 1141 uptr module_name_len = internal_readlink( 1142 default_module_name, buf, buf_len); 1143 int readlink_error; 1144 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1145 #endif // SANITIZER_SOLARIS 1146 if (IsErr) { 1147 // We can't read binary name for some reason, assume it's unknown. 1148 Report("WARNING: reading executable name failed with errno %d, " 1149 "some stack frames may not be symbolized\n", readlink_error); 1150 module_name_len = internal_snprintf(buf, buf_len, "%s", 1151 default_module_name); 1152 CHECK_LT(module_name_len, buf_len); 1153 } 1154 return module_name_len; 1155 #endif 1156 } 1157 1158 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1159 #if SANITIZER_LINUX 1160 char *tmpbuf; 1161 uptr tmpsize; 1162 uptr tmplen; 1163 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1164 1024 * 1024)) { 1165 internal_strncpy(buf, tmpbuf, buf_len); 1166 UnmapOrDie(tmpbuf, tmpsize); 1167 return internal_strlen(buf); 1168 } 1169 #endif 1170 return ReadBinaryName(buf, buf_len); 1171 } 1172 1173 // Match full names of the form /path/to/base_name{-,.}* 1174 bool LibraryNameIs(const char *full_name, const char *base_name) { 1175 const char *name = full_name; 1176 // Strip path. 1177 while (*name != '\0') name++; 1178 while (name > full_name && *name != '/') name--; 1179 if (*name == '/') name++; 1180 uptr base_name_length = internal_strlen(base_name); 1181 if (internal_strncmp(name, base_name, base_name_length)) return false; 1182 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1183 } 1184 1185 #if !SANITIZER_ANDROID 1186 // Call cb for each region mapped by map. 1187 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1188 CHECK_NE(map, nullptr); 1189 #if !SANITIZER_FREEBSD 1190 typedef ElfW(Phdr) Elf_Phdr; 1191 typedef ElfW(Ehdr) Elf_Ehdr; 1192 #endif // !SANITIZER_FREEBSD 1193 char *base = (char *)map->l_addr; 1194 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1195 char *phdrs = base + ehdr->e_phoff; 1196 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1197 1198 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1199 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1200 // objects have a non-zero base. 1201 uptr preferred_base = (uptr)-1; 1202 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1203 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1204 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1205 preferred_base = (uptr)phdr->p_vaddr; 1206 } 1207 1208 // Compute the delta from the real base to get a relocation delta. 1209 sptr delta = (uptr)base - preferred_base; 1210 // Now we can figure out what the loader really mapped. 1211 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1212 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1213 if (phdr->p_type == PT_LOAD) { 1214 uptr seg_start = phdr->p_vaddr + delta; 1215 uptr seg_end = seg_start + phdr->p_memsz; 1216 // None of these values are aligned. We consider the ragged edges of the 1217 // load command as defined, since they are mapped from the file. 1218 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1219 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1220 cb((void *)seg_start, seg_end - seg_start); 1221 } 1222 } 1223 } 1224 #endif 1225 1226 #if SANITIZER_LINUX 1227 #if defined(__x86_64__) 1228 // We cannot use glibc's clone wrapper, because it messes with the child 1229 // task's TLS. It writes the PID and TID of the child task to its thread 1230 // descriptor, but in our case the child task shares the thread descriptor with 1231 // the parent (because we don't know how to allocate a new thread 1232 // descriptor to keep glibc happy). So the stock version of clone(), when 1233 // used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1234 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1235 int *parent_tidptr, void *newtls, int *child_tidptr) { 1236 long long res; 1237 if (!fn || !child_stack) 1238 return -EINVAL; 1239 CHECK_EQ(0, (uptr)child_stack % 16); 1240 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1241 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1242 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1243 register void *r8 __asm__("r8") = newtls; 1244 register int *r10 __asm__("r10") = child_tidptr; 1245 __asm__ __volatile__( 1246 /* %rax = syscall(%rax = SYSCALL(clone), 1247 * %rdi = flags, 1248 * %rsi = child_stack, 1249 * %rdx = parent_tidptr, 1250 * %r8 = new_tls, 1251 * %r10 = child_tidptr) 1252 */ 1253 "syscall\n" 1254 1255 /* if (%rax != 0) 1256 * return; 1257 */ 1258 "testq %%rax,%%rax\n" 1259 "jnz 1f\n" 1260 1261 /* In the child. Terminate unwind chain. */ 1262 // XXX: We should also terminate the CFI unwind chain 1263 // here. Unfortunately clang 3.2 doesn't support the 1264 // necessary CFI directives, so we skip that part. 1265 "xorq %%rbp,%%rbp\n" 1266 1267 /* Call "fn(arg)". */ 1268 "popq %%rax\n" 1269 "popq %%rdi\n" 1270 "call *%%rax\n" 1271 1272 /* Call _exit(%rax). */ 1273 "movq %%rax,%%rdi\n" 1274 "movq %2,%%rax\n" 1275 "syscall\n" 1276 1277 /* Return to parent. */ 1278 "1:\n" 1279 : "=a" (res) 1280 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1281 "S"(child_stack), 1282 "D"(flags), 1283 "d"(parent_tidptr), 1284 "r"(r8), 1285 "r"(r10) 1286 : "memory", "r11", "rcx"); 1287 return res; 1288 } 1289 #elif defined(__mips__) 1290 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1291 int *parent_tidptr, void *newtls, int *child_tidptr) { 1292 long long res; 1293 if (!fn || !child_stack) 1294 return -EINVAL; 1295 CHECK_EQ(0, (uptr)child_stack % 16); 1296 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1297 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1298 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1299 register void *a3 __asm__("$7") = newtls; 1300 register int *a4 __asm__("$8") = child_tidptr; 1301 // We don't have proper CFI directives here because it requires alot of code 1302 // for very marginal benefits. 1303 __asm__ __volatile__( 1304 /* $v0 = syscall($v0 = __NR_clone, 1305 * $a0 = flags, 1306 * $a1 = child_stack, 1307 * $a2 = parent_tidptr, 1308 * $a3 = new_tls, 1309 * $a4 = child_tidptr) 1310 */ 1311 ".cprestore 16;\n" 1312 "move $4,%1;\n" 1313 "move $5,%2;\n" 1314 "move $6,%3;\n" 1315 "move $7,%4;\n" 1316 /* Store the fifth argument on stack 1317 * if we are using 32-bit abi. 1318 */ 1319 #if SANITIZER_WORDSIZE == 32 1320 "lw %5,16($29);\n" 1321 #else 1322 "move $8,%5;\n" 1323 #endif 1324 "li $2,%6;\n" 1325 "syscall;\n" 1326 1327 /* if ($v0 != 0) 1328 * return; 1329 */ 1330 "bnez $2,1f;\n" 1331 1332 /* Call "fn(arg)". */ 1333 #if SANITIZER_WORDSIZE == 32 1334 #ifdef __BIG_ENDIAN__ 1335 "lw $25,4($29);\n" 1336 "lw $4,12($29);\n" 1337 #else 1338 "lw $25,0($29);\n" 1339 "lw $4,8($29);\n" 1340 #endif 1341 #else 1342 "ld $25,0($29);\n" 1343 "ld $4,8($29);\n" 1344 #endif 1345 "jal $25;\n" 1346 1347 /* Call _exit($v0). */ 1348 "move $4,$2;\n" 1349 "li $2,%7;\n" 1350 "syscall;\n" 1351 1352 /* Return to parent. */ 1353 "1:\n" 1354 : "=r" (res) 1355 : "r"(flags), 1356 "r"(child_stack), 1357 "r"(parent_tidptr), 1358 "r"(a3), 1359 "r"(a4), 1360 "i"(__NR_clone), 1361 "i"(__NR_exit) 1362 : "memory", "$29" ); 1363 return res; 1364 } 1365 #elif SANITIZER_RISCV64 1366 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1367 int *parent_tidptr, void *newtls, int *child_tidptr) { 1368 if (!fn || !child_stack) 1369 return -EINVAL; 1370 1371 CHECK_EQ(0, (uptr)child_stack % 16); 1372 1373 register int res __asm__("a0"); 1374 register int __flags __asm__("a0") = flags; 1375 register void *__stack __asm__("a1") = child_stack; 1376 register int *__ptid __asm__("a2") = parent_tidptr; 1377 register void *__tls __asm__("a3") = newtls; 1378 register int *__ctid __asm__("a4") = child_tidptr; 1379 register int (*__fn)(void *) __asm__("a5") = fn; 1380 register void *__arg __asm__("a6") = arg; 1381 register int nr_clone __asm__("a7") = __NR_clone; 1382 1383 __asm__ __volatile__( 1384 "ecall\n" 1385 1386 /* if (a0 != 0) 1387 * return a0; 1388 */ 1389 "bnez a0, 1f\n" 1390 1391 // In the child, now. Call "fn(arg)". 1392 "mv a0, a6\n" 1393 "jalr a5\n" 1394 1395 // Call _exit(a0). 1396 "addi a7, zero, %9\n" 1397 "ecall\n" 1398 "1:\n" 1399 1400 : "=r"(res) 1401 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__tls), "r"(__ctid), 1402 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit) 1403 : "memory"); 1404 return res; 1405 } 1406 #elif defined(__aarch64__) 1407 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1408 int *parent_tidptr, void *newtls, int *child_tidptr) { 1409 register long long res __asm__("x0"); 1410 if (!fn || !child_stack) 1411 return -EINVAL; 1412 CHECK_EQ(0, (uptr)child_stack % 16); 1413 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1414 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1415 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1416 1417 register int (*__fn)(void *) __asm__("x0") = fn; 1418 register void *__stack __asm__("x1") = child_stack; 1419 register int __flags __asm__("x2") = flags; 1420 register void *__arg __asm__("x3") = arg; 1421 register int *__ptid __asm__("x4") = parent_tidptr; 1422 register void *__tls __asm__("x5") = newtls; 1423 register int *__ctid __asm__("x6") = child_tidptr; 1424 1425 __asm__ __volatile__( 1426 "mov x0,x2\n" /* flags */ 1427 "mov x2,x4\n" /* ptid */ 1428 "mov x3,x5\n" /* tls */ 1429 "mov x4,x6\n" /* ctid */ 1430 "mov x8,%9\n" /* clone */ 1431 1432 "svc 0x0\n" 1433 1434 /* if (%r0 != 0) 1435 * return %r0; 1436 */ 1437 "cmp x0, #0\n" 1438 "bne 1f\n" 1439 1440 /* In the child, now. Call "fn(arg)". */ 1441 "ldp x1, x0, [sp], #16\n" 1442 "blr x1\n" 1443 1444 /* Call _exit(%r0). */ 1445 "mov x8, %10\n" 1446 "svc 0x0\n" 1447 "1:\n" 1448 1449 : "=r" (res) 1450 : "i"(-EINVAL), 1451 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1452 "r"(__ptid), "r"(__tls), "r"(__ctid), 1453 "i"(__NR_clone), "i"(__NR_exit) 1454 : "x30", "memory"); 1455 return res; 1456 } 1457 #elif defined(__powerpc64__) 1458 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1459 int *parent_tidptr, void *newtls, int *child_tidptr) { 1460 long long res; 1461 // Stack frame structure. 1462 #if SANITIZER_PPC64V1 1463 // Back chain == 0 (SP + 112) 1464 // Frame (112 bytes): 1465 // Parameter save area (SP + 48), 8 doublewords 1466 // TOC save area (SP + 40) 1467 // Link editor doubleword (SP + 32) 1468 // Compiler doubleword (SP + 24) 1469 // LR save area (SP + 16) 1470 // CR save area (SP + 8) 1471 // Back chain (SP + 0) 1472 # define FRAME_SIZE 112 1473 # define FRAME_TOC_SAVE_OFFSET 40 1474 #elif SANITIZER_PPC64V2 1475 // Back chain == 0 (SP + 32) 1476 // Frame (32 bytes): 1477 // TOC save area (SP + 24) 1478 // LR save area (SP + 16) 1479 // CR save area (SP + 8) 1480 // Back chain (SP + 0) 1481 # define FRAME_SIZE 32 1482 # define FRAME_TOC_SAVE_OFFSET 24 1483 #else 1484 # error "Unsupported PPC64 ABI" 1485 #endif 1486 if (!fn || !child_stack) 1487 return -EINVAL; 1488 CHECK_EQ(0, (uptr)child_stack % 16); 1489 1490 register int (*__fn)(void *) __asm__("r3") = fn; 1491 register void *__cstack __asm__("r4") = child_stack; 1492 register int __flags __asm__("r5") = flags; 1493 register void *__arg __asm__("r6") = arg; 1494 register int *__ptidptr __asm__("r7") = parent_tidptr; 1495 register void *__newtls __asm__("r8") = newtls; 1496 register int *__ctidptr __asm__("r9") = child_tidptr; 1497 1498 __asm__ __volatile__( 1499 /* fn and arg are saved across the syscall */ 1500 "mr 28, %5\n\t" 1501 "mr 27, %8\n\t" 1502 1503 /* syscall 1504 r0 == __NR_clone 1505 r3 == flags 1506 r4 == child_stack 1507 r5 == parent_tidptr 1508 r6 == newtls 1509 r7 == child_tidptr */ 1510 "mr 3, %7\n\t" 1511 "mr 5, %9\n\t" 1512 "mr 6, %10\n\t" 1513 "mr 7, %11\n\t" 1514 "li 0, %3\n\t" 1515 "sc\n\t" 1516 1517 /* Test if syscall was successful */ 1518 "cmpdi cr1, 3, 0\n\t" 1519 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1520 "bne- cr1, 1f\n\t" 1521 1522 /* Set up stack frame */ 1523 "li 29, 0\n\t" 1524 "stdu 29, -8(1)\n\t" 1525 "stdu 1, -%12(1)\n\t" 1526 /* Do the function call */ 1527 "std 2, %13(1)\n\t" 1528 #if SANITIZER_PPC64V1 1529 "ld 0, 0(28)\n\t" 1530 "ld 2, 8(28)\n\t" 1531 "mtctr 0\n\t" 1532 #elif SANITIZER_PPC64V2 1533 "mr 12, 28\n\t" 1534 "mtctr 12\n\t" 1535 #else 1536 # error "Unsupported PPC64 ABI" 1537 #endif 1538 "mr 3, 27\n\t" 1539 "bctrl\n\t" 1540 "ld 2, %13(1)\n\t" 1541 1542 /* Call _exit(r3) */ 1543 "li 0, %4\n\t" 1544 "sc\n\t" 1545 1546 /* Return to parent */ 1547 "1:\n\t" 1548 "mr %0, 3\n\t" 1549 : "=r" (res) 1550 : "0" (-1), 1551 "i" (EINVAL), 1552 "i" (__NR_clone), 1553 "i" (__NR_exit), 1554 "r" (__fn), 1555 "r" (__cstack), 1556 "r" (__flags), 1557 "r" (__arg), 1558 "r" (__ptidptr), 1559 "r" (__newtls), 1560 "r" (__ctidptr), 1561 "i" (FRAME_SIZE), 1562 "i" (FRAME_TOC_SAVE_OFFSET) 1563 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1564 return res; 1565 } 1566 #elif defined(__i386__) 1567 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1568 int *parent_tidptr, void *newtls, int *child_tidptr) { 1569 int res; 1570 if (!fn || !child_stack) 1571 return -EINVAL; 1572 CHECK_EQ(0, (uptr)child_stack % 16); 1573 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1574 ((unsigned int *)child_stack)[0] = (uptr)flags; 1575 ((unsigned int *)child_stack)[1] = (uptr)0; 1576 ((unsigned int *)child_stack)[2] = (uptr)fn; 1577 ((unsigned int *)child_stack)[3] = (uptr)arg; 1578 __asm__ __volatile__( 1579 /* %eax = syscall(%eax = SYSCALL(clone), 1580 * %ebx = flags, 1581 * %ecx = child_stack, 1582 * %edx = parent_tidptr, 1583 * %esi = new_tls, 1584 * %edi = child_tidptr) 1585 */ 1586 1587 /* Obtain flags */ 1588 "movl (%%ecx), %%ebx\n" 1589 /* Do the system call */ 1590 "pushl %%ebx\n" 1591 "pushl %%esi\n" 1592 "pushl %%edi\n" 1593 /* Remember the flag value. */ 1594 "movl %%ebx, (%%ecx)\n" 1595 "int $0x80\n" 1596 "popl %%edi\n" 1597 "popl %%esi\n" 1598 "popl %%ebx\n" 1599 1600 /* if (%eax != 0) 1601 * return; 1602 */ 1603 1604 "test %%eax,%%eax\n" 1605 "jnz 1f\n" 1606 1607 /* terminate the stack frame */ 1608 "xorl %%ebp,%%ebp\n" 1609 /* Call FN. */ 1610 "call *%%ebx\n" 1611 #ifdef PIC 1612 "call here\n" 1613 "here:\n" 1614 "popl %%ebx\n" 1615 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1616 #endif 1617 /* Call exit */ 1618 "movl %%eax, %%ebx\n" 1619 "movl %2, %%eax\n" 1620 "int $0x80\n" 1621 "1:\n" 1622 : "=a" (res) 1623 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1624 "c"(child_stack), 1625 "d"(parent_tidptr), 1626 "S"(newtls), 1627 "D"(child_tidptr) 1628 : "memory"); 1629 return res; 1630 } 1631 #elif defined(__arm__) 1632 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1633 int *parent_tidptr, void *newtls, int *child_tidptr) { 1634 unsigned int res; 1635 if (!fn || !child_stack) 1636 return -EINVAL; 1637 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1638 ((unsigned int *)child_stack)[0] = (uptr)fn; 1639 ((unsigned int *)child_stack)[1] = (uptr)arg; 1640 register int r0 __asm__("r0") = flags; 1641 register void *r1 __asm__("r1") = child_stack; 1642 register int *r2 __asm__("r2") = parent_tidptr; 1643 register void *r3 __asm__("r3") = newtls; 1644 register int *r4 __asm__("r4") = child_tidptr; 1645 register int r7 __asm__("r7") = __NR_clone; 1646 1647 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) 1648 # define ARCH_HAS_BX 1649 #endif 1650 #if __ARM_ARCH > 4 1651 # define ARCH_HAS_BLX 1652 #endif 1653 1654 #ifdef ARCH_HAS_BX 1655 # ifdef ARCH_HAS_BLX 1656 # define BLX(R) "blx " #R "\n" 1657 # else 1658 # define BLX(R) "mov lr, pc; bx " #R "\n" 1659 # endif 1660 #else 1661 # define BLX(R) "mov lr, pc; mov pc," #R "\n" 1662 #endif 1663 1664 __asm__ __volatile__( 1665 /* %r0 = syscall(%r7 = SYSCALL(clone), 1666 * %r0 = flags, 1667 * %r1 = child_stack, 1668 * %r2 = parent_tidptr, 1669 * %r3 = new_tls, 1670 * %r4 = child_tidptr) 1671 */ 1672 1673 /* Do the system call */ 1674 "swi 0x0\n" 1675 1676 /* if (%r0 != 0) 1677 * return %r0; 1678 */ 1679 "cmp r0, #0\n" 1680 "bne 1f\n" 1681 1682 /* In the child, now. Call "fn(arg)". */ 1683 "ldr r0, [sp, #4]\n" 1684 "ldr ip, [sp], #8\n" 1685 BLX(ip) 1686 /* Call _exit(%r0). */ 1687 "mov r7, %7\n" 1688 "swi 0x0\n" 1689 "1:\n" 1690 "mov %0, r0\n" 1691 : "=r"(res) 1692 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), 1693 "i"(__NR_exit) 1694 : "memory"); 1695 return res; 1696 } 1697 #endif 1698 #endif // SANITIZER_LINUX 1699 1700 #if SANITIZER_LINUX 1701 int internal_uname(struct utsname *buf) { 1702 return internal_syscall(SYSCALL(uname), buf); 1703 } 1704 #endif 1705 1706 #if SANITIZER_ANDROID 1707 #if __ANDROID_API__ < 21 1708 extern "C" __attribute__((weak)) int dl_iterate_phdr( 1709 int (*)(struct dl_phdr_info *, size_t, void *), void *); 1710 #endif 1711 1712 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, 1713 void *data) { 1714 // Any name starting with "lib" indicates a bug in L where library base names 1715 // are returned instead of paths. 1716 if (info->dlpi_name && info->dlpi_name[0] == 'l' && 1717 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { 1718 *(bool *)data = true; 1719 return 1; 1720 } 1721 return 0; 1722 } 1723 1724 static atomic_uint32_t android_api_level; 1725 1726 static AndroidApiLevel AndroidDetectApiLevelStatic() { 1727 #if __ANDROID_API__ <= 19 1728 return ANDROID_KITKAT; 1729 #elif __ANDROID_API__ <= 22 1730 return ANDROID_LOLLIPOP_MR1; 1731 #else 1732 return ANDROID_POST_LOLLIPOP; 1733 #endif 1734 } 1735 1736 static AndroidApiLevel AndroidDetectApiLevel() { 1737 if (!&dl_iterate_phdr) 1738 return ANDROID_KITKAT; // K or lower 1739 bool base_name_seen = false; 1740 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); 1741 if (base_name_seen) 1742 return ANDROID_LOLLIPOP_MR1; // L MR1 1743 return ANDROID_POST_LOLLIPOP; // post-L 1744 // Plain L (API level 21) is completely broken wrt ASan and not very 1745 // interesting to detect. 1746 } 1747 1748 extern "C" __attribute__((weak)) void* _DYNAMIC; 1749 1750 AndroidApiLevel AndroidGetApiLevel() { 1751 AndroidApiLevel level = 1752 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); 1753 if (level) return level; 1754 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic() 1755 : AndroidDetectApiLevel(); 1756 atomic_store(&android_api_level, level, memory_order_relaxed); 1757 return level; 1758 } 1759 1760 #endif 1761 1762 static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1763 switch (signum) { 1764 case SIGABRT: 1765 return common_flags()->handle_abort; 1766 case SIGILL: 1767 return common_flags()->handle_sigill; 1768 case SIGTRAP: 1769 return common_flags()->handle_sigtrap; 1770 case SIGFPE: 1771 return common_flags()->handle_sigfpe; 1772 case SIGSEGV: 1773 return common_flags()->handle_segv; 1774 case SIGBUS: 1775 return common_flags()->handle_sigbus; 1776 } 1777 return kHandleSignalNo; 1778 } 1779 1780 HandleSignalMode GetHandleSignalMode(int signum) { 1781 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1782 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1783 return kHandleSignalExclusive; 1784 return result; 1785 } 1786 1787 #if !SANITIZER_GO 1788 void *internal_start_thread(void *(*func)(void *arg), void *arg) { 1789 if (&real_pthread_create == 0) 1790 return nullptr; 1791 // Start the thread with signals blocked, otherwise it can steal user signals. 1792 ScopedBlockSignals block(nullptr); 1793 void *th; 1794 real_pthread_create(&th, nullptr, func, arg); 1795 return th; 1796 } 1797 1798 void internal_join_thread(void *th) { 1799 if (&real_pthread_join) 1800 real_pthread_join(th, nullptr); 1801 } 1802 #else 1803 void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; } 1804 1805 void internal_join_thread(void *th) {} 1806 #endif 1807 1808 #if SANITIZER_LINUX && defined(__aarch64__) 1809 // Android headers in the older NDK releases miss this definition. 1810 struct __sanitizer_esr_context { 1811 struct _aarch64_ctx head; 1812 uint64_t esr; 1813 }; 1814 1815 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1816 static const u32 kEsrMagic = 0x45535201; 1817 u8 *aux = reinterpret_cast<u8 *>(ucontext->uc_mcontext.__reserved); 1818 while (true) { 1819 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1820 if (ctx->size == 0) break; 1821 if (ctx->magic == kEsrMagic) { 1822 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1823 return true; 1824 } 1825 aux += ctx->size; 1826 } 1827 return false; 1828 } 1829 #elif SANITIZER_FREEBSD && defined(__aarch64__) 1830 // FreeBSD doesn't provide ESR in the ucontext. 1831 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1832 return false; 1833 } 1834 #endif 1835 1836 using Context = ucontext_t; 1837 1838 SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1839 Context *ucontext = (Context *)context; 1840 #if defined(__x86_64__) || defined(__i386__) 1841 static const uptr PF_WRITE = 1U << 1; 1842 #if SANITIZER_FREEBSD 1843 uptr err = ucontext->uc_mcontext.mc_err; 1844 #elif SANITIZER_NETBSD 1845 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1846 #elif SANITIZER_SOLARIS && defined(__i386__) 1847 const int Err = 13; 1848 uptr err = ucontext->uc_mcontext.gregs[Err]; 1849 #else 1850 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1851 #endif // SANITIZER_FREEBSD 1852 return err & PF_WRITE ? Write : Read; 1853 #elif defined(__mips__) 1854 uint32_t *exception_source; 1855 uint32_t faulty_instruction; 1856 uint32_t op_code; 1857 1858 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 1859 faulty_instruction = (uint32_t)(*exception_source); 1860 1861 op_code = (faulty_instruction >> 26) & 0x3f; 1862 1863 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 1864 switch (op_code) { 1865 case 0x28: // sb 1866 case 0x29: // sh 1867 case 0x2b: // sw 1868 case 0x3f: // sd 1869 #if __mips_isa_rev < 6 1870 case 0x2c: // sdl 1871 case 0x2d: // sdr 1872 case 0x2a: // swl 1873 case 0x2e: // swr 1874 #endif 1875 return SignalContext::Write; 1876 1877 case 0x20: // lb 1878 case 0x24: // lbu 1879 case 0x21: // lh 1880 case 0x25: // lhu 1881 case 0x23: // lw 1882 case 0x27: // lwu 1883 case 0x37: // ld 1884 #if __mips_isa_rev < 6 1885 case 0x1a: // ldl 1886 case 0x1b: // ldr 1887 case 0x22: // lwl 1888 case 0x26: // lwr 1889 #endif 1890 return SignalContext::Read; 1891 #if __mips_isa_rev == 6 1892 case 0x3b: // pcrel 1893 op_code = (faulty_instruction >> 19) & 0x3; 1894 switch (op_code) { 1895 case 0x1: // lwpc 1896 case 0x2: // lwupc 1897 return SignalContext::Read; 1898 } 1899 #endif 1900 } 1901 return SignalContext::Unknown; 1902 #elif defined(__arm__) 1903 static const uptr FSR_WRITE = 1U << 11; 1904 uptr fsr = ucontext->uc_mcontext.error_code; 1905 return fsr & FSR_WRITE ? Write : Read; 1906 #elif defined(__aarch64__) 1907 static const u64 ESR_ELx_WNR = 1U << 6; 1908 u64 esr; 1909 if (!Aarch64GetESR(ucontext, &esr)) return Unknown; 1910 return esr & ESR_ELx_WNR ? Write : Read; 1911 #elif defined(__sparc__) 1912 // Decode the instruction to determine the access type. 1913 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 1914 #if SANITIZER_SOLARIS 1915 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 1916 #else 1917 // Historical BSDism here. 1918 struct sigcontext *scontext = (struct sigcontext *)context; 1919 #if defined(__arch64__) 1920 uptr pc = scontext->sigc_regs.tpc; 1921 #else 1922 uptr pc = scontext->si_regs.pc; 1923 #endif 1924 #endif 1925 u32 instr = *(u32 *)pc; 1926 return (instr >> 21) & 1 ? Write: Read; 1927 #elif defined(__riscv) 1928 #if SANITIZER_FREEBSD 1929 unsigned long pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc; 1930 #else 1931 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC]; 1932 #endif 1933 unsigned faulty_instruction = *(uint16_t *)pc; 1934 1935 #if defined(__riscv_compressed) 1936 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction 1937 // set op_bits to the instruction bits [1, 0, 15, 14, 13] 1938 unsigned op_bits = 1939 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13); 1940 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive 1941 switch (op_bits) { 1942 case 0b10'010: // c.lwsp (rd != x0) 1943 #if __riscv_xlen == 64 1944 case 0b10'011: // c.ldsp (rd != x0) 1945 #endif 1946 return rd ? SignalContext::Read : SignalContext::Unknown; 1947 case 0b00'010: // c.lw 1948 #if __riscv_flen >= 32 && __riscv_xlen == 32 1949 case 0b10'011: // c.flwsp 1950 #endif 1951 #if __riscv_flen >= 32 || __riscv_xlen == 64 1952 case 0b00'011: // c.flw / c.ld 1953 #endif 1954 #if __riscv_flen == 64 1955 case 0b00'001: // c.fld 1956 case 0b10'001: // c.fldsp 1957 #endif 1958 return SignalContext::Read; 1959 case 0b00'110: // c.sw 1960 case 0b10'110: // c.swsp 1961 #if __riscv_flen >= 32 || __riscv_xlen == 64 1962 case 0b00'111: // c.fsw / c.sd 1963 case 0b10'111: // c.fswsp / c.sdsp 1964 #endif 1965 #if __riscv_flen == 64 1966 case 0b00'101: // c.fsd 1967 case 0b10'101: // c.fsdsp 1968 #endif 1969 return SignalContext::Write; 1970 default: 1971 return SignalContext::Unknown; 1972 } 1973 } 1974 #endif 1975 1976 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits 1977 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive 1978 switch (opcode) { 1979 case 0b0000011: // loads 1980 switch (funct3) { 1981 case 0b000: // lb 1982 case 0b001: // lh 1983 case 0b010: // lw 1984 #if __riscv_xlen == 64 1985 case 0b011: // ld 1986 #endif 1987 case 0b100: // lbu 1988 case 0b101: // lhu 1989 return SignalContext::Read; 1990 default: 1991 return SignalContext::Unknown; 1992 } 1993 case 0b0100011: // stores 1994 switch (funct3) { 1995 case 0b000: // sb 1996 case 0b001: // sh 1997 case 0b010: // sw 1998 #if __riscv_xlen == 64 1999 case 0b011: // sd 2000 #endif 2001 return SignalContext::Write; 2002 default: 2003 return SignalContext::Unknown; 2004 } 2005 #if __riscv_flen >= 32 2006 case 0b0000111: // floating-point loads 2007 switch (funct3) { 2008 case 0b010: // flw 2009 #if __riscv_flen == 64 2010 case 0b011: // fld 2011 #endif 2012 return SignalContext::Read; 2013 default: 2014 return SignalContext::Unknown; 2015 } 2016 case 0b0100111: // floating-point stores 2017 switch (funct3) { 2018 case 0b010: // fsw 2019 #if __riscv_flen == 64 2020 case 0b011: // fsd 2021 #endif 2022 return SignalContext::Write; 2023 default: 2024 return SignalContext::Unknown; 2025 } 2026 #endif 2027 default: 2028 return SignalContext::Unknown; 2029 } 2030 #else 2031 (void)ucontext; 2032 return Unknown; // FIXME: Implement. 2033 #endif 2034 } 2035 2036 bool SignalContext::IsTrueFaultingAddress() const { 2037 auto si = static_cast<const siginfo_t *>(siginfo); 2038 // SIGSEGV signals without a true fault address have si_code set to 128. 2039 return si->si_signo == SIGSEGV && si->si_code != 128; 2040 } 2041 2042 void SignalContext::DumpAllRegisters(void *context) { 2043 // FIXME: Implement this. 2044 } 2045 2046 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 2047 #if SANITIZER_NETBSD 2048 // This covers all NetBSD architectures 2049 ucontext_t *ucontext = (ucontext_t *)context; 2050 *pc = _UC_MACHINE_PC(ucontext); 2051 *bp = _UC_MACHINE_FP(ucontext); 2052 *sp = _UC_MACHINE_SP(ucontext); 2053 #elif defined(__arm__) 2054 ucontext_t *ucontext = (ucontext_t*)context; 2055 *pc = ucontext->uc_mcontext.arm_pc; 2056 *bp = ucontext->uc_mcontext.arm_fp; 2057 *sp = ucontext->uc_mcontext.arm_sp; 2058 #elif defined(__aarch64__) 2059 # if SANITIZER_FREEBSD 2060 ucontext_t *ucontext = (ucontext_t*)context; 2061 *pc = ucontext->uc_mcontext.mc_gpregs.gp_elr; 2062 *bp = ucontext->uc_mcontext.mc_gpregs.gp_x[29]; 2063 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp; 2064 # else 2065 ucontext_t *ucontext = (ucontext_t*)context; 2066 *pc = ucontext->uc_mcontext.pc; 2067 *bp = ucontext->uc_mcontext.regs[29]; 2068 *sp = ucontext->uc_mcontext.sp; 2069 # endif 2070 #elif defined(__hppa__) 2071 ucontext_t *ucontext = (ucontext_t*)context; 2072 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 2073 /* GCC uses %r3 whenever a frame pointer is needed. */ 2074 *bp = ucontext->uc_mcontext.sc_gr[3]; 2075 *sp = ucontext->uc_mcontext.sc_gr[30]; 2076 #elif defined(__x86_64__) 2077 # if SANITIZER_FREEBSD 2078 ucontext_t *ucontext = (ucontext_t*)context; 2079 *pc = ucontext->uc_mcontext.mc_rip; 2080 *bp = ucontext->uc_mcontext.mc_rbp; 2081 *sp = ucontext->uc_mcontext.mc_rsp; 2082 # else 2083 ucontext_t *ucontext = (ucontext_t*)context; 2084 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 2085 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 2086 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 2087 # endif 2088 #elif defined(__i386__) 2089 # if SANITIZER_FREEBSD 2090 ucontext_t *ucontext = (ucontext_t*)context; 2091 *pc = ucontext->uc_mcontext.mc_eip; 2092 *bp = ucontext->uc_mcontext.mc_ebp; 2093 *sp = ucontext->uc_mcontext.mc_esp; 2094 # else 2095 ucontext_t *ucontext = (ucontext_t*)context; 2096 # if SANITIZER_SOLARIS 2097 /* Use the numeric values: the symbolic ones are undefined by llvm 2098 include/llvm/Support/Solaris.h. */ 2099 # ifndef REG_EIP 2100 # define REG_EIP 14 // REG_PC 2101 # endif 2102 # ifndef REG_EBP 2103 # define REG_EBP 6 // REG_FP 2104 # endif 2105 # ifndef REG_UESP 2106 # define REG_UESP 17 // REG_SP 2107 # endif 2108 # endif 2109 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 2110 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 2111 *sp = ucontext->uc_mcontext.gregs[REG_UESP]; 2112 # endif 2113 #elif defined(__powerpc__) || defined(__powerpc64__) 2114 # if SANITIZER_FREEBSD 2115 ucontext_t *ucontext = (ucontext_t *)context; 2116 *pc = ucontext->uc_mcontext.mc_srr0; 2117 *sp = ucontext->uc_mcontext.mc_frame[1]; 2118 *bp = ucontext->uc_mcontext.mc_frame[31]; 2119 # else 2120 ucontext_t *ucontext = (ucontext_t*)context; 2121 *pc = ucontext->uc_mcontext.regs->nip; 2122 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 2123 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 2124 // pointer, but GCC always uses r31 when we need a frame pointer. 2125 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 2126 # endif 2127 #elif defined(__sparc__) 2128 #if defined(__arch64__) || defined(__sparcv9) 2129 #define STACK_BIAS 2047 2130 #else 2131 #define STACK_BIAS 0 2132 # endif 2133 # if SANITIZER_SOLARIS 2134 ucontext_t *ucontext = (ucontext_t *)context; 2135 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 2136 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS; 2137 #else 2138 // Historical BSDism here. 2139 struct sigcontext *scontext = (struct sigcontext *)context; 2140 #if defined(__arch64__) 2141 *pc = scontext->sigc_regs.tpc; 2142 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS; 2143 #else 2144 *pc = scontext->si_regs.pc; 2145 *sp = scontext->si_regs.u_regs[14]; 2146 #endif 2147 # endif 2148 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS; 2149 #elif defined(__mips__) 2150 ucontext_t *ucontext = (ucontext_t*)context; 2151 *pc = ucontext->uc_mcontext.pc; 2152 *bp = ucontext->uc_mcontext.gregs[30]; 2153 *sp = ucontext->uc_mcontext.gregs[29]; 2154 #elif defined(__s390__) 2155 ucontext_t *ucontext = (ucontext_t*)context; 2156 # if defined(__s390x__) 2157 *pc = ucontext->uc_mcontext.psw.addr; 2158 # else 2159 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 2160 # endif 2161 *bp = ucontext->uc_mcontext.gregs[11]; 2162 *sp = ucontext->uc_mcontext.gregs[15]; 2163 #elif defined(__riscv) 2164 ucontext_t *ucontext = (ucontext_t*)context; 2165 # if SANITIZER_FREEBSD 2166 *pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc; 2167 *bp = ucontext->uc_mcontext.mc_gpregs.gp_s[0]; 2168 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp; 2169 # else 2170 *pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2171 *bp = ucontext->uc_mcontext.__gregs[REG_S0]; 2172 *sp = ucontext->uc_mcontext.__gregs[REG_SP]; 2173 # endif 2174 # elif defined(__hexagon__) 2175 ucontext_t *ucontext = (ucontext_t *)context; 2176 *pc = ucontext->uc_mcontext.pc; 2177 *bp = ucontext->uc_mcontext.r30; 2178 *sp = ucontext->uc_mcontext.r29; 2179 # else 2180 # error "Unsupported arch" 2181 # endif 2182 } 2183 2184 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 2185 2186 void InitializePlatformEarly() { 2187 // Do nothing. 2188 } 2189 2190 void CheckASLR() { 2191 #if SANITIZER_NETBSD 2192 int mib[3]; 2193 int paxflags; 2194 uptr len = sizeof(paxflags); 2195 2196 mib[0] = CTL_PROC; 2197 mib[1] = internal_getpid(); 2198 mib[2] = PROC_PID_PAXFLAGS; 2199 2200 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2201 Printf("sysctl failed\n"); 2202 Die(); 2203 } 2204 2205 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2206 Printf("This sanitizer is not compatible with enabled ASLR.\n" 2207 "To disable ASLR, please run \"paxctl +a %s\" and try again.\n", 2208 GetArgv()[0]); 2209 Die(); 2210 } 2211 #elif SANITIZER_FREEBSD 2212 int aslr_status; 2213 int r = internal_procctl(P_PID, 0, PROC_ASLR_STATUS, &aslr_status); 2214 if (UNLIKELY(r == -1)) { 2215 // We're making things less 'dramatic' here since 2216 // the cmd is not necessarily guaranteed to be here 2217 // just yet regarding FreeBSD release 2218 return; 2219 } 2220 if ((aslr_status & PROC_ASLR_ACTIVE) != 0) { 2221 VReport(1, "This sanitizer is not compatible with enabled ASLR " 2222 "and binaries compiled with PIE\n" 2223 "ASLR will be disabled and the program re-executed.\n"); 2224 int aslr_ctl = PROC_ASLR_FORCE_DISABLE; 2225 CHECK_NE(procctl(P_PID, 0, PROC_ASLR_CTL, &aslr_ctl), -1); 2226 ReExec(); 2227 } 2228 # elif SANITIZER_PPC64V2 2229 // Disable ASLR for Linux PPC64LE. 2230 int old_personality = personality(0xffffffff); 2231 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2232 VReport(1, 2233 "WARNING: Program is being run with address space layout " 2234 "randomization (ASLR) enabled which prevents the thread and " 2235 "memory sanitizers from working on powerpc64le.\n" 2236 "ASLR will be disabled and the program re-executed.\n"); 2237 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2238 ReExec(); 2239 } 2240 # else 2241 // Do nothing 2242 # endif 2243 } 2244 2245 void CheckMPROTECT() { 2246 #if SANITIZER_NETBSD 2247 int mib[3]; 2248 int paxflags; 2249 uptr len = sizeof(paxflags); 2250 2251 mib[0] = CTL_PROC; 2252 mib[1] = internal_getpid(); 2253 mib[2] = PROC_PID_PAXFLAGS; 2254 2255 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2256 Printf("sysctl failed\n"); 2257 Die(); 2258 } 2259 2260 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2261 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2262 Die(); 2263 } 2264 #else 2265 // Do nothing 2266 #endif 2267 } 2268 2269 void CheckNoDeepBind(const char *filename, int flag) { 2270 #ifdef RTLD_DEEPBIND 2271 if (flag & RTLD_DEEPBIND) { 2272 Report( 2273 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2274 " which is incompatible with sanitizer runtime " 2275 "(see https://github.com/google/sanitizers/issues/611 for details" 2276 "). If you want to run %s library under sanitizers please remove " 2277 "RTLD_DEEPBIND from dlopen flags.\n", 2278 filename, filename); 2279 Die(); 2280 } 2281 #endif 2282 } 2283 2284 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2285 uptr *largest_gap_found, 2286 uptr *max_occupied_addr) { 2287 UNREACHABLE("FindAvailableMemoryRange is not available"); 2288 return 0; 2289 } 2290 2291 bool GetRandom(void *buffer, uptr length, bool blocking) { 2292 if (!buffer || !length || length > 256) 2293 return false; 2294 #if SANITIZER_USE_GETENTROPY 2295 uptr rnd = getentropy(buffer, length); 2296 int rverrno = 0; 2297 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2298 return false; 2299 else if (rnd == 0) 2300 return true; 2301 #endif // SANITIZER_USE_GETENTROPY 2302 2303 #if SANITIZER_USE_GETRANDOM 2304 static atomic_uint8_t skip_getrandom_syscall; 2305 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2306 // Up to 256 bytes, getrandom will not be interrupted. 2307 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2308 blocking ? 0 : GRND_NONBLOCK); 2309 int rverrno = 0; 2310 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2311 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2312 else if (res == length) 2313 return true; 2314 } 2315 #endif // SANITIZER_USE_GETRANDOM 2316 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2317 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2318 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2319 if (internal_iserror(fd)) 2320 return false; 2321 uptr res = internal_read(fd, buffer, length); 2322 if (internal_iserror(res)) 2323 return false; 2324 internal_close(fd); 2325 return true; 2326 } 2327 2328 } // namespace __sanitizer 2329 2330 #endif 2331