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_OPENBSD || 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 defined(__mips64) 38 #include <asm/unistd.h> 39 #include <sys/types.h> 40 #define stat kernel_stat 41 #include <asm/stat.h> 42 #undef stat 43 #endif 44 45 #include <dlfcn.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <link.h> 49 #include <pthread.h> 50 #include <sched.h> 51 #include <signal.h> 52 #include <sys/mman.h> 53 #include <sys/param.h> 54 #if !SANITIZER_SOLARIS 55 #include <sys/ptrace.h> 56 #endif 57 #include <sys/resource.h> 58 #include <sys/stat.h> 59 #include <sys/syscall.h> 60 #include <sys/time.h> 61 #include <sys/types.h> 62 #if !SANITIZER_OPENBSD 63 #include <ucontext.h> 64 #endif 65 #if SANITIZER_OPENBSD 66 #include <sys/futex.h> 67 #include <sys/sysctl.h> 68 #endif 69 #include <unistd.h> 70 71 #if SANITIZER_LINUX 72 #include <sys/utsname.h> 73 #endif 74 75 #if SANITIZER_LINUX && !SANITIZER_ANDROID 76 #include <sys/personality.h> 77 #endif 78 79 #if SANITIZER_FREEBSD 80 #include <sys/exec.h> 81 #include <sys/sysctl.h> 82 #include <machine/atomic.h> 83 extern "C" { 84 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on 85 // FreeBSD 9.2 and 10.0. 86 #include <sys/umtx.h> 87 } 88 #include <sys/thr.h> 89 #endif // SANITIZER_FREEBSD 90 91 #if SANITIZER_NETBSD 92 #include <limits.h> // For NAME_MAX 93 #include <sys/sysctl.h> 94 #include <sys/exec.h> 95 extern struct ps_strings *__ps_strings; 96 #endif // SANITIZER_NETBSD 97 98 #if SANITIZER_SOLARIS 99 #include <stdlib.h> 100 #include <thread.h> 101 #define environ _environ 102 #endif 103 104 extern char **environ; 105 106 #if SANITIZER_LINUX 107 // <linux/time.h> 108 struct kernel_timeval { 109 long tv_sec; 110 long tv_usec; 111 }; 112 113 // <linux/futex.h> is broken on some linux distributions. 114 const int FUTEX_WAIT = 0; 115 const int FUTEX_WAKE = 1; 116 const int FUTEX_PRIVATE_FLAG = 128; 117 const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; 118 const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; 119 #endif // SANITIZER_LINUX 120 121 // Are we using 32-bit or 64-bit Linux syscalls? 122 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 123 // but it still needs to use 64-bit syscalls. 124 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \ 125 SANITIZER_WORDSIZE == 64) 126 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 127 #else 128 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 129 #endif 130 131 // Note : FreeBSD had implemented both 132 // Linux and OpenBSD apis, available from 133 // future 12.x version most likely 134 #if SANITIZER_LINUX && defined(__NR_getrandom) 135 # if !defined(GRND_NONBLOCK) 136 # define GRND_NONBLOCK 1 137 # endif 138 # define SANITIZER_USE_GETRANDOM 1 139 #else 140 # define SANITIZER_USE_GETRANDOM 0 141 #endif // SANITIZER_LINUX && defined(__NR_getrandom) 142 143 #if SANITIZER_OPENBSD 144 # define SANITIZER_USE_GETENTROPY 1 145 #else 146 # if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000 147 # define SANITIZER_USE_GETENTROPY 1 148 # else 149 # define SANITIZER_USE_GETENTROPY 0 150 # endif 151 #endif // SANITIZER_USE_GETENTROPY 152 153 namespace __sanitizer { 154 155 #if SANITIZER_LINUX && defined(__x86_64__) 156 #include "sanitizer_syscall_linux_x86_64.inc" 157 #elif SANITIZER_LINUX && defined(__aarch64__) 158 #include "sanitizer_syscall_linux_aarch64.inc" 159 #elif SANITIZER_LINUX && defined(__arm__) 160 #include "sanitizer_syscall_linux_arm.inc" 161 #else 162 #include "sanitizer_syscall_generic.inc" 163 #endif 164 165 // --------------- sanitizer_libc.h 166 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 167 #if !SANITIZER_S390 && !SANITIZER_OPENBSD 168 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd, 169 u64 offset) { 170 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 171 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd, 172 offset); 173 #else 174 // mmap2 specifies file offset in 4096-byte units. 175 CHECK(IsAligned(offset, 4096)); 176 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd, 177 offset / 4096); 178 #endif 179 } 180 #endif // !SANITIZER_S390 && !SANITIZER_OPENBSD 181 182 #if !SANITIZER_OPENBSD 183 uptr internal_munmap(void *addr, uptr length) { 184 return internal_syscall(SYSCALL(munmap), (uptr)addr, length); 185 } 186 187 int internal_mprotect(void *addr, uptr length, int prot) { 188 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot); 189 } 190 #endif 191 192 uptr internal_close(fd_t fd) { 193 return internal_syscall(SYSCALL(close), fd); 194 } 195 196 uptr internal_open(const char *filename, int flags) { 197 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 198 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags); 199 #else 200 return internal_syscall(SYSCALL(open), (uptr)filename, flags); 201 #endif 202 } 203 204 uptr internal_open(const char *filename, int flags, u32 mode) { 205 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 206 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags, 207 mode); 208 #else 209 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode); 210 #endif 211 } 212 213 uptr internal_read(fd_t fd, void *buf, uptr count) { 214 sptr res; 215 HANDLE_EINTR(res, 216 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)); 217 return res; 218 } 219 220 uptr internal_write(fd_t fd, const void *buf, uptr count) { 221 sptr res; 222 HANDLE_EINTR(res, 223 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)); 224 return res; 225 } 226 227 uptr internal_ftruncate(fd_t fd, uptr size) { 228 sptr res; 229 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd, 230 (OFF_T)size)); 231 return res; 232 } 233 234 #if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && SANITIZER_LINUX 235 static void stat64_to_stat(struct stat64 *in, struct stat *out) { 236 internal_memset(out, 0, sizeof(*out)); 237 out->st_dev = in->st_dev; 238 out->st_ino = in->st_ino; 239 out->st_mode = in->st_mode; 240 out->st_nlink = in->st_nlink; 241 out->st_uid = in->st_uid; 242 out->st_gid = in->st_gid; 243 out->st_rdev = in->st_rdev; 244 out->st_size = in->st_size; 245 out->st_blksize = in->st_blksize; 246 out->st_blocks = in->st_blocks; 247 out->st_atime = in->st_atime; 248 out->st_mtime = in->st_mtime; 249 out->st_ctime = in->st_ctime; 250 } 251 #endif 252 253 #if defined(__mips64) 254 // Undefine compatibility macros from <sys/stat.h> 255 // so that they would not clash with the kernel_stat 256 // st_[a|m|c]time fields 257 #undef st_atime 258 #undef st_mtime 259 #undef st_ctime 260 #if defined(SANITIZER_ANDROID) 261 // Bionic sys/stat.h defines additional macros 262 // for compatibility with the old NDKs and 263 // they clash with the kernel_stat structure 264 // st_[a|m|c]time_nsec fields. 265 #undef st_atime_nsec 266 #undef st_mtime_nsec 267 #undef st_ctime_nsec 268 #endif 269 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) { 270 internal_memset(out, 0, sizeof(*out)); 271 out->st_dev = in->st_dev; 272 out->st_ino = in->st_ino; 273 out->st_mode = in->st_mode; 274 out->st_nlink = in->st_nlink; 275 out->st_uid = in->st_uid; 276 out->st_gid = in->st_gid; 277 out->st_rdev = in->st_rdev; 278 out->st_size = in->st_size; 279 out->st_blksize = in->st_blksize; 280 out->st_blocks = in->st_blocks; 281 #if defined(__USE_MISC) || \ 282 defined(__USE_XOPEN2K8) || \ 283 defined(SANITIZER_ANDROID) 284 out->st_atim.tv_sec = in->st_atime; 285 out->st_atim.tv_nsec = in->st_atime_nsec; 286 out->st_mtim.tv_sec = in->st_mtime; 287 out->st_mtim.tv_nsec = in->st_mtime_nsec; 288 out->st_ctim.tv_sec = in->st_ctime; 289 out->st_ctim.tv_nsec = in->st_ctime_nsec; 290 #else 291 out->st_atime = in->st_atime; 292 out->st_atimensec = in->st_atime_nsec; 293 out->st_mtime = in->st_mtime; 294 out->st_mtimensec = in->st_mtime_nsec; 295 out->st_ctime = in->st_ctime; 296 out->st_atimensec = in->st_ctime_nsec; 297 #endif 298 } 299 #endif 300 301 uptr internal_stat(const char *path, void *buf) { 302 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 303 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0); 304 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 305 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 306 0); 307 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 308 # if defined(__mips64) 309 // For mips64, stat syscall fills buffer in the format of kernel_stat 310 struct kernel_stat kbuf; 311 int res = internal_syscall(SYSCALL(stat), path, &kbuf); 312 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 313 return res; 314 # else 315 return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf); 316 # endif 317 #else 318 struct stat64 buf64; 319 int res = internal_syscall(SYSCALL(stat64), path, &buf64); 320 stat64_to_stat(&buf64, (struct stat *)buf); 321 return res; 322 #endif 323 } 324 325 uptr internal_lstat(const char *path, void *buf) { 326 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 327 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 328 AT_SYMLINK_NOFOLLOW); 329 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 330 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 331 AT_SYMLINK_NOFOLLOW); 332 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 333 # if SANITIZER_MIPS64 334 // For mips64, lstat syscall fills buffer in the format of kernel_stat 335 struct kernel_stat kbuf; 336 int res = internal_syscall(SYSCALL(lstat), path, &kbuf); 337 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 338 return res; 339 # else 340 return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf); 341 # endif 342 #else 343 struct stat64 buf64; 344 int res = internal_syscall(SYSCALL(lstat64), path, &buf64); 345 stat64_to_stat(&buf64, (struct stat *)buf); 346 return res; 347 #endif 348 } 349 350 uptr internal_fstat(fd_t fd, void *buf) { 351 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD || \ 352 SANITIZER_LINUX_USES_64BIT_SYSCALLS 353 #if SANITIZER_MIPS64 && !SANITIZER_OPENBSD 354 // For mips64, fstat syscall fills buffer in the format of kernel_stat 355 struct kernel_stat kbuf; 356 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf); 357 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 358 return res; 359 # else 360 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf); 361 # endif 362 #else 363 struct stat64 buf64; 364 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64); 365 stat64_to_stat(&buf64, (struct stat *)buf); 366 return res; 367 #endif 368 } 369 370 uptr internal_filesize(fd_t fd) { 371 struct stat st; 372 if (internal_fstat(fd, &st)) 373 return -1; 374 return (uptr)st.st_size; 375 } 376 377 uptr internal_dup(int oldfd) { 378 return internal_syscall(SYSCALL(dup), oldfd); 379 } 380 381 uptr internal_dup2(int oldfd, int newfd) { 382 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 383 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0); 384 #else 385 return internal_syscall(SYSCALL(dup2), oldfd, newfd); 386 #endif 387 } 388 389 uptr internal_readlink(const char *path, char *buf, uptr bufsize) { 390 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 391 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 392 bufsize); 393 #elif SANITIZER_OPENBSD 394 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 395 bufsize); 396 #else 397 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize); 398 #endif 399 } 400 401 uptr internal_unlink(const char *path) { 402 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD 403 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0); 404 #else 405 return internal_syscall(SYSCALL(unlink), (uptr)path); 406 #endif 407 } 408 409 uptr internal_rename(const char *oldpath, const char *newpath) { 410 #if defined(__riscv) 411 return internal_syscall(SYSCALL(renameat2), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 412 (uptr)newpath, 0); 413 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD 414 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 415 (uptr)newpath); 416 #else 417 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath); 418 #endif 419 } 420 421 uptr internal_sched_yield() { 422 return internal_syscall(SYSCALL(sched_yield)); 423 } 424 425 void internal__exit(int exitcode) { 426 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 427 internal_syscall(SYSCALL(exit), exitcode); 428 #else 429 internal_syscall(SYSCALL(exit_group), exitcode); 430 #endif 431 Die(); // Unreachable. 432 } 433 434 unsigned int internal_sleep(unsigned int seconds) { 435 struct timespec ts; 436 ts.tv_sec = seconds; 437 ts.tv_nsec = 0; 438 int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts); 439 if (res) return ts.tv_sec; 440 return 0; 441 } 442 443 uptr internal_execve(const char *filename, char *const argv[], 444 char *const envp[]) { 445 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, 446 (uptr)envp); 447 } 448 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 449 450 // ----------------- sanitizer_common.h 451 bool FileExists(const char *filename) { 452 if (ShouldMockFailureToOpen(filename)) 453 return false; 454 struct stat st; 455 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 456 if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0)) 457 #else 458 if (internal_stat(filename, &st)) 459 #endif 460 return false; 461 // Sanity check: filename is a regular file. 462 return S_ISREG(st.st_mode); 463 } 464 465 #if !SANITIZER_NETBSD 466 tid_t GetTid() { 467 #if SANITIZER_FREEBSD 468 long Tid; 469 thr_self(&Tid); 470 return Tid; 471 #elif SANITIZER_OPENBSD 472 return internal_syscall(SYSCALL(getthrid)); 473 #elif SANITIZER_SOLARIS 474 return thr_self(); 475 #else 476 return internal_syscall(SYSCALL(gettid)); 477 #endif 478 } 479 480 int TgKill(pid_t pid, tid_t tid, int sig) { 481 #if SANITIZER_LINUX 482 return internal_syscall(SYSCALL(tgkill), pid, tid, sig); 483 #elif SANITIZER_FREEBSD 484 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig); 485 #elif SANITIZER_OPENBSD 486 (void)pid; 487 return internal_syscall(SYSCALL(thrkill), tid, sig, nullptr); 488 #elif SANITIZER_SOLARIS 489 (void)pid; 490 return thr_kill(tid, sig); 491 #endif 492 } 493 #endif 494 495 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 496 u64 NanoTime() { 497 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 498 timeval tv; 499 #else 500 kernel_timeval tv; 501 #endif 502 internal_memset(&tv, 0, sizeof(tv)); 503 internal_syscall(SYSCALL(gettimeofday), &tv, 0); 504 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000; 505 } 506 507 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) { 508 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp); 509 } 510 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 511 512 // Like getenv, but reads env directly from /proc (on Linux) or parses the 513 // 'environ' array (on some others) and does not use libc. This function 514 // should be called first inside __asan_init. 515 const char *GetEnv(const char *name) { 516 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD || \ 517 SANITIZER_SOLARIS 518 if (::environ != 0) { 519 uptr NameLen = internal_strlen(name); 520 for (char **Env = ::environ; *Env != 0; Env++) { 521 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=') 522 return (*Env) + NameLen + 1; 523 } 524 } 525 return 0; // Not found. 526 #elif SANITIZER_LINUX 527 static char *environ; 528 static uptr len; 529 static bool inited; 530 if (!inited) { 531 inited = true; 532 uptr environ_size; 533 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len)) 534 environ = nullptr; 535 } 536 if (!environ || len == 0) return nullptr; 537 uptr namelen = internal_strlen(name); 538 const char *p = environ; 539 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 540 // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 541 const char* endp = 542 (char*)internal_memchr(p, '\0', len - (p - environ)); 543 if (!endp) // this entry isn't NUL terminated 544 return nullptr; 545 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 546 return p + namelen + 1; // point after = 547 p = endp + 1; 548 } 549 return nullptr; // Not found. 550 #else 551 #error "Unsupported platform" 552 #endif 553 } 554 555 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_OPENBSD && \ 556 !SANITIZER_GO 557 extern "C" { 558 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 559 } 560 #endif 561 562 #if !SANITIZER_GO && !SANITIZER_FREEBSD && !SANITIZER_NETBSD && \ 563 !SANITIZER_OPENBSD 564 static void ReadNullSepFileToArray(const char *path, char ***arr, 565 int arr_size) { 566 char *buff; 567 uptr buff_size; 568 uptr buff_len; 569 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 570 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 571 (*arr)[0] = nullptr; 572 return; 573 } 574 (*arr)[0] = buff; 575 int count, i; 576 for (count = 1, i = 1; ; i++) { 577 if (buff[i] == 0) { 578 if (buff[i+1] == 0) break; 579 (*arr)[count] = &buff[i+1]; 580 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 581 count++; 582 } 583 } 584 (*arr)[count] = nullptr; 585 } 586 #endif 587 588 #if !SANITIZER_OPENBSD && !SANITIZER_GO 589 static void GetArgsAndEnv(char ***argv, char ***envp) { 590 #if SANITIZER_FREEBSD 591 // On FreeBSD, retrieving the argument and environment arrays is done via the 592 // kern.ps_strings sysctl, which returns a pointer to a structure containing 593 // this information. See also <sys/exec.h>. 594 ps_strings *pss; 595 uptr sz = sizeof(pss); 596 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 597 Printf("sysctl kern.ps_strings failed\n"); 598 Die(); 599 } 600 *argv = pss->ps_argvstr; 601 *envp = pss->ps_envstr; 602 #elif SANITIZER_NETBSD 603 *argv = __ps_strings->ps_argvstr; 604 *envp = __ps_strings->ps_envstr; 605 #else // SANITIZER_FREEBSD 606 #if !SANITIZER_GO 607 if (&__libc_stack_end) { 608 #endif // !SANITIZER_GO 609 uptr* stack_end = (uptr*)__libc_stack_end; 610 int argc = *stack_end; 611 *argv = (char**)(stack_end + 1); 612 *envp = (char**)(stack_end + argc + 2); 613 #if !SANITIZER_GO 614 } else { 615 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 616 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 617 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 618 } 619 #endif // !SANITIZER_GO 620 #endif // SANITIZER_FREEBSD 621 } 622 623 char **GetArgv() { 624 char **argv, **envp; 625 GetArgsAndEnv(&argv, &envp); 626 return argv; 627 } 628 629 char **GetEnviron() { 630 char **argv, **envp; 631 GetArgsAndEnv(&argv, &envp); 632 return envp; 633 } 634 635 #endif // !SANITIZER_OPENBSD 636 637 #if !SANITIZER_SOLARIS 638 enum MutexState { 639 MtxUnlocked = 0, 640 MtxLocked = 1, 641 MtxSleeping = 2 642 }; 643 644 BlockingMutex::BlockingMutex() { 645 internal_memset(this, 0, sizeof(*this)); 646 } 647 648 void BlockingMutex::Lock() { 649 CHECK_EQ(owner_, 0); 650 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 651 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked) 652 return; 653 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) { 654 #if SANITIZER_FREEBSD 655 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0); 656 #elif SANITIZER_NETBSD 657 sched_yield(); /* No userspace futex-like synchronization */ 658 #else 659 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT_PRIVATE, MtxSleeping, 660 0, 0, 0); 661 #endif 662 } 663 } 664 665 void BlockingMutex::Unlock() { 666 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 667 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release); 668 CHECK_NE(v, MtxUnlocked); 669 if (v == MtxSleeping) { 670 #if SANITIZER_FREEBSD 671 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0); 672 #elif SANITIZER_NETBSD 673 /* No userspace futex-like synchronization */ 674 #else 675 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0); 676 #endif 677 } 678 } 679 680 void BlockingMutex::CheckLocked() { 681 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 682 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed)); 683 } 684 #endif // !SANITIZER_SOLARIS 685 686 // ----------------- sanitizer_linux.h 687 // The actual size of this structure is specified by d_reclen. 688 // Note that getdents64 uses a different structure format. We only provide the 689 // 32-bit syscall here. 690 #if SANITIZER_NETBSD 691 // Not used 692 #elif SANITIZER_OPENBSD 693 // struct dirent is different for Linux and us. At this moment, we use only 694 // d_fileno (Linux call this d_ino), d_reclen, and d_name. 695 struct linux_dirent { 696 u64 d_ino; // d_fileno 697 u16 d_reclen; 698 u16 d_namlen; // not used 699 u8 d_type; // not used 700 char d_name[NAME_MAX + 1]; 701 }; 702 #else 703 struct linux_dirent { 704 #if SANITIZER_X32 || defined(__aarch64__) 705 u64 d_ino; 706 u64 d_off; 707 #else 708 unsigned long d_ino; 709 unsigned long d_off; 710 #endif 711 unsigned short d_reclen; 712 #ifdef __aarch64__ 713 unsigned char d_type; 714 #endif 715 char d_name[256]; 716 }; 717 #endif 718 719 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 720 // Syscall wrappers. 721 uptr internal_ptrace(int request, int pid, void *addr, void *data) { 722 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 723 (uptr)data); 724 } 725 726 uptr internal_waitpid(int pid, int *status, int options) { 727 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 728 0 /* rusage */); 729 } 730 731 uptr internal_getpid() { 732 return internal_syscall(SYSCALL(getpid)); 733 } 734 735 uptr internal_getppid() { 736 return internal_syscall(SYSCALL(getppid)); 737 } 738 739 int internal_dlinfo(void *handle, int request, void *p) { 740 #if SANITIZER_FREEBSD 741 return dlinfo(handle, request, p); 742 #else 743 UNIMPLEMENTED(); 744 #endif 745 } 746 747 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 748 #if SANITIZER_FREEBSD 749 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 750 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 751 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 752 #else 753 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 754 #endif 755 } 756 757 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 758 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 759 } 760 761 #if SANITIZER_LINUX 762 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 763 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 764 } 765 #endif 766 767 uptr internal_sigaltstack(const void *ss, void *oss) { 768 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 769 } 770 771 int internal_fork() { 772 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 773 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 774 #else 775 return internal_syscall(SYSCALL(fork)); 776 #endif 777 } 778 779 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 780 int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 781 uptr *oldlenp, const void *newp, uptr newlen) { 782 #if SANITIZER_OPENBSD 783 return sysctl(name, namelen, oldp, (size_t *)oldlenp, (void *)newp, 784 (size_t)newlen); 785 #else 786 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 787 (size_t *)oldlenp, newp, (size_t)newlen); 788 #endif 789 } 790 791 #if SANITIZER_FREEBSD 792 int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 793 const void *newp, uptr newlen) { 794 static decltype(sysctlbyname) *real = nullptr; 795 if (!real) 796 real = (decltype(sysctlbyname) *)dlsym(RTLD_NEXT, "sysctlbyname"); 797 CHECK(real); 798 return real(sname, oldp, (size_t *)oldlenp, newp, (size_t)newlen); 799 } 800 #endif 801 #endif 802 803 #if SANITIZER_LINUX 804 #define SA_RESTORER 0x04000000 805 // Doesn't set sa_restorer if the caller did not set it, so use with caution 806 //(see below). 807 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 808 __sanitizer_kernel_sigaction_t k_act, k_oldact; 809 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 810 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 811 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 812 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 813 if (u_act) { 814 k_act.handler = u_act->handler; 815 k_act.sigaction = u_act->sigaction; 816 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 817 sizeof(__sanitizer_kernel_sigset_t)); 818 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 819 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 820 // FIXME: most often sa_restorer is unset, however the kernel requires it 821 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 822 // If sa_restorer passed to the kernel is NULL, the program may crash upon 823 // signal delivery or fail to unwind the stack in the signal handler. 824 // libc implementation of sigaction() passes its own restorer to 825 // rt_sigaction, so we need to do the same (we'll need to reimplement the 826 // restorers; for x86_64 the restorer address can be obtained from 827 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 828 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 829 k_act.sa_restorer = u_act->sa_restorer; 830 #endif 831 } 832 833 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 834 (uptr)(u_act ? &k_act : nullptr), 835 (uptr)(u_oldact ? &k_oldact : nullptr), 836 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 837 838 if ((result == 0) && u_oldact) { 839 u_oldact->handler = k_oldact.handler; 840 u_oldact->sigaction = k_oldact.sigaction; 841 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 842 sizeof(__sanitizer_kernel_sigset_t)); 843 u_oldact->sa_flags = k_oldact.sa_flags; 844 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 845 u_oldact->sa_restorer = k_oldact.sa_restorer; 846 #endif 847 } 848 return result; 849 } 850 #endif // SANITIZER_LINUX 851 852 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 853 __sanitizer_sigset_t *oldset) { 854 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 855 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 856 #else 857 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 858 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 859 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, 860 (uptr)&k_set->sig[0], (uptr)&k_oldset->sig[0], 861 sizeof(__sanitizer_kernel_sigset_t)); 862 #endif 863 } 864 865 void internal_sigfillset(__sanitizer_sigset_t *set) { 866 internal_memset(set, 0xff, sizeof(*set)); 867 } 868 869 void internal_sigemptyset(__sanitizer_sigset_t *set) { 870 internal_memset(set, 0, sizeof(*set)); 871 } 872 873 #if SANITIZER_LINUX 874 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 875 signum -= 1; 876 CHECK_GE(signum, 0); 877 CHECK_LT(signum, sizeof(*set) * 8); 878 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 879 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 880 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 881 k_set->sig[idx] &= ~(1 << bit); 882 } 883 884 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 885 signum -= 1; 886 CHECK_GE(signum, 0); 887 CHECK_LT(signum, sizeof(*set) * 8); 888 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 889 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 890 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 891 return k_set->sig[idx] & (1 << bit); 892 } 893 #elif SANITIZER_FREEBSD 894 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 895 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 896 sigdelset(rset, signum); 897 } 898 899 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 900 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 901 return sigismember(rset, signum); 902 } 903 #endif 904 #endif // !SANITIZER_SOLARIS 905 906 #if !SANITIZER_NETBSD 907 // ThreadLister implementation. 908 ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) { 909 char task_directory_path[80]; 910 internal_snprintf(task_directory_path, sizeof(task_directory_path), 911 "/proc/%d/task/", pid); 912 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 913 if (internal_iserror(descriptor_)) { 914 Report("Can't open /proc/%d/task for reading.\n", pid); 915 } 916 } 917 918 ThreadLister::Result ThreadLister::ListThreads( 919 InternalMmapVector<tid_t> *threads) { 920 if (internal_iserror(descriptor_)) 921 return Error; 922 internal_lseek(descriptor_, 0, SEEK_SET); 923 threads->clear(); 924 925 Result result = Ok; 926 for (bool first_read = true;; first_read = false) { 927 // Resize to max capacity if it was downsized by IsAlive. 928 buffer_.resize(buffer_.capacity()); 929 CHECK_GE(buffer_.size(), 4096); 930 uptr read = internal_getdents( 931 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size()); 932 if (!read) 933 return result; 934 if (internal_iserror(read)) { 935 Report("Can't read directory entries from /proc/%d/task.\n", pid_); 936 return Error; 937 } 938 939 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 940 struct linux_dirent *entry = (struct linux_dirent *)begin; 941 begin += entry->d_reclen; 942 if (entry->d_ino == 1) { 943 // Inode 1 is for bad blocks and also can be a reason for early return. 944 // Should be emitted if kernel tried to output terminating thread. 945 // See proc_task_readdir implementation in Linux. 946 result = Incomplete; 947 } 948 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 949 threads->push_back(internal_atoll(entry->d_name)); 950 } 951 952 // Now we are going to detect short-read or early EOF. In such cases Linux 953 // can return inconsistent list with missing alive threads. 954 // Code will just remember that the list can be incomplete but it will 955 // continue reads to return as much as possible. 956 if (!first_read) { 957 // The first one was a short-read by definition. 958 result = Incomplete; 959 } else if (read > buffer_.size() - 1024) { 960 // Read was close to the buffer size. So double the size and assume the 961 // worst. 962 buffer_.resize(buffer_.size() * 2); 963 result = Incomplete; 964 } else if (!threads->empty() && !IsAlive(threads->back())) { 965 // Maybe Linux early returned from read on terminated thread (!pid_alive) 966 // and failed to restore read position. 967 // See next_tid and proc_task_instantiate in Linux. 968 result = Incomplete; 969 } 970 } 971 } 972 973 bool ThreadLister::IsAlive(int tid) { 974 // /proc/%d/task/%d/status uses same call to detect alive threads as 975 // proc_task_readdir. See task_state implementation in Linux. 976 char path[80]; 977 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid); 978 if (!ReadFileToVector(path, &buffer_) || buffer_.empty()) 979 return false; 980 buffer_.push_back(0); 981 static const char kPrefix[] = "\nPPid:"; 982 const char *field = internal_strstr(buffer_.data(), kPrefix); 983 if (!field) 984 return false; 985 field += internal_strlen(kPrefix); 986 return (int)internal_atoll(field) != 0; 987 } 988 989 ThreadLister::~ThreadLister() { 990 if (!internal_iserror(descriptor_)) 991 internal_close(descriptor_); 992 } 993 #endif 994 995 #if SANITIZER_WORDSIZE == 32 996 // Take care of unusable kernel area in top gigabyte. 997 static uptr GetKernelAreaSize() { 998 #if SANITIZER_LINUX && !SANITIZER_X32 999 const uptr gbyte = 1UL << 30; 1000 1001 // Firstly check if there are writable segments 1002 // mapped to top gigabyte (e.g. stack). 1003 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 1004 if (proc_maps.Error()) 1005 return 0; 1006 MemoryMappedSegment segment; 1007 while (proc_maps.Next(&segment)) { 1008 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0; 1009 } 1010 1011 #if !SANITIZER_ANDROID 1012 // Even if nothing is mapped, top Gb may still be accessible 1013 // if we are running on 64-bit kernel. 1014 // Uname may report misleading results if personality type 1015 // is modified (e.g. under schroot) so check this as well. 1016 struct utsname uname_info; 1017 int pers = personality(0xffffffffUL); 1018 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 && 1019 internal_strstr(uname_info.machine, "64")) 1020 return 0; 1021 #endif // SANITIZER_ANDROID 1022 1023 // Top gigabyte is reserved for kernel. 1024 return gbyte; 1025 #else 1026 return 0; 1027 #endif // SANITIZER_LINUX && !SANITIZER_X32 1028 } 1029 #endif // SANITIZER_WORDSIZE == 32 1030 1031 uptr GetMaxVirtualAddress() { 1032 #if (SANITIZER_NETBSD || SANITIZER_OPENBSD) && defined(__x86_64__) 1033 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE) 1034 #elif SANITIZER_WORDSIZE == 64 1035 # if defined(__powerpc64__) || defined(__aarch64__) 1036 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 1037 // We somehow need to figure out which one we are using now and choose 1038 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 1039 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 1040 // of the address space, so simply checking the stack address is not enough. 1041 // This should (does) work for both PowerPC64 Endian modes. 1042 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit. 1043 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1; 1044 # elif defined(__mips64) 1045 return (1ULL << 40) - 1; // 0x000000ffffffffffUL; 1046 # elif defined(__s390x__) 1047 return (1ULL << 53) - 1; // 0x001fffffffffffffUL; 1048 #elif defined(__sparc__) 1049 return ~(uptr)0; 1050 # else 1051 return (1ULL << 47) - 1; // 0x00007fffffffffffUL; 1052 # endif 1053 #else // SANITIZER_WORDSIZE == 32 1054 # if defined(__s390__) 1055 return (1ULL << 31) - 1; // 0x7fffffff; 1056 # else 1057 return (1ULL << 32) - 1; // 0xffffffff; 1058 # endif 1059 #endif // SANITIZER_WORDSIZE 1060 } 1061 1062 uptr GetMaxUserVirtualAddress() { 1063 uptr addr = GetMaxVirtualAddress(); 1064 #if SANITIZER_WORDSIZE == 32 && !defined(__s390__) 1065 if (!common_flags()->full_address_space) 1066 addr -= GetKernelAreaSize(); 1067 CHECK_LT(reinterpret_cast<uptr>(&addr), addr); 1068 #endif 1069 return addr; 1070 } 1071 1072 #if !SANITIZER_ANDROID 1073 uptr GetPageSize() { 1074 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) && \ 1075 defined(EXEC_PAGESIZE) 1076 return EXEC_PAGESIZE; 1077 #elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1078 // Use sysctl as sysconf can trigger interceptors internally. 1079 int pz = 0; 1080 uptr pzl = sizeof(pz); 1081 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1082 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1083 CHECK_EQ(rv, 0); 1084 return (uptr)pz; 1085 #elif SANITIZER_USE_GETAUXVAL 1086 return getauxval(AT_PAGESZ); 1087 #else 1088 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1089 #endif 1090 } 1091 #endif // !SANITIZER_ANDROID 1092 1093 #if !SANITIZER_OPENBSD 1094 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { 1095 #if SANITIZER_SOLARIS 1096 const char *default_module_name = getexecname(); 1097 CHECK_NE(default_module_name, NULL); 1098 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1099 #else 1100 #if SANITIZER_FREEBSD || SANITIZER_NETBSD 1101 #if SANITIZER_FREEBSD 1102 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1103 #else 1104 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1105 #endif 1106 const char *default_module_name = "kern.proc.pathname"; 1107 uptr Size = buf_len; 1108 bool IsErr = 1109 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1110 int readlink_error = IsErr ? errno : 0; 1111 uptr module_name_len = Size; 1112 #else 1113 const char *default_module_name = "/proc/self/exe"; 1114 uptr module_name_len = internal_readlink( 1115 default_module_name, buf, buf_len); 1116 int readlink_error; 1117 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1118 #endif // SANITIZER_SOLARIS 1119 if (IsErr) { 1120 // We can't read binary name for some reason, assume it's unknown. 1121 Report("WARNING: reading executable name failed with errno %d, " 1122 "some stack frames may not be symbolized\n", readlink_error); 1123 module_name_len = internal_snprintf(buf, buf_len, "%s", 1124 default_module_name); 1125 CHECK_LT(module_name_len, buf_len); 1126 } 1127 return module_name_len; 1128 #endif 1129 } 1130 #endif // !SANITIZER_OPENBSD 1131 1132 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1133 #if SANITIZER_LINUX 1134 char *tmpbuf; 1135 uptr tmpsize; 1136 uptr tmplen; 1137 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1138 1024 * 1024)) { 1139 internal_strncpy(buf, tmpbuf, buf_len); 1140 UnmapOrDie(tmpbuf, tmpsize); 1141 return internal_strlen(buf); 1142 } 1143 #endif 1144 return ReadBinaryName(buf, buf_len); 1145 } 1146 1147 // Match full names of the form /path/to/base_name{-,.}* 1148 bool LibraryNameIs(const char *full_name, const char *base_name) { 1149 const char *name = full_name; 1150 // Strip path. 1151 while (*name != '\0') name++; 1152 while (name > full_name && *name != '/') name--; 1153 if (*name == '/') name++; 1154 uptr base_name_length = internal_strlen(base_name); 1155 if (internal_strncmp(name, base_name, base_name_length)) return false; 1156 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1157 } 1158 1159 #if !SANITIZER_ANDROID 1160 // Call cb for each region mapped by map. 1161 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1162 CHECK_NE(map, nullptr); 1163 #if !SANITIZER_FREEBSD && !SANITIZER_OPENBSD 1164 typedef ElfW(Phdr) Elf_Phdr; 1165 typedef ElfW(Ehdr) Elf_Ehdr; 1166 #endif // !SANITIZER_FREEBSD && !SANITIZER_OPENBSD 1167 char *base = (char *)map->l_addr; 1168 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1169 char *phdrs = base + ehdr->e_phoff; 1170 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1171 1172 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1173 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1174 // objects have a non-zero base. 1175 uptr preferred_base = (uptr)-1; 1176 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1177 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1178 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1179 preferred_base = (uptr)phdr->p_vaddr; 1180 } 1181 1182 // Compute the delta from the real base to get a relocation delta. 1183 sptr delta = (uptr)base - preferred_base; 1184 // Now we can figure out what the loader really mapped. 1185 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1186 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1187 if (phdr->p_type == PT_LOAD) { 1188 uptr seg_start = phdr->p_vaddr + delta; 1189 uptr seg_end = seg_start + phdr->p_memsz; 1190 // None of these values are aligned. We consider the ragged edges of the 1191 // load command as defined, since they are mapped from the file. 1192 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1193 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1194 cb((void *)seg_start, seg_end - seg_start); 1195 } 1196 } 1197 } 1198 #endif 1199 1200 #if defined(__x86_64__) && SANITIZER_LINUX 1201 // We cannot use glibc's clone wrapper, because it messes with the child 1202 // task's TLS. It writes the PID and TID of the child task to its thread 1203 // descriptor, but in our case the child task shares the thread descriptor with 1204 // the parent (because we don't know how to allocate a new thread 1205 // descriptor to keep glibc happy). So the stock version of clone(), when 1206 // used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1207 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1208 int *parent_tidptr, void *newtls, int *child_tidptr) { 1209 long long res; 1210 if (!fn || !child_stack) 1211 return -EINVAL; 1212 CHECK_EQ(0, (uptr)child_stack % 16); 1213 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1214 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1215 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1216 register void *r8 __asm__("r8") = newtls; 1217 register int *r10 __asm__("r10") = child_tidptr; 1218 __asm__ __volatile__( 1219 /* %rax = syscall(%rax = SYSCALL(clone), 1220 * %rdi = flags, 1221 * %rsi = child_stack, 1222 * %rdx = parent_tidptr, 1223 * %r8 = new_tls, 1224 * %r10 = child_tidptr) 1225 */ 1226 "syscall\n" 1227 1228 /* if (%rax != 0) 1229 * return; 1230 */ 1231 "testq %%rax,%%rax\n" 1232 "jnz 1f\n" 1233 1234 /* In the child. Terminate unwind chain. */ 1235 // XXX: We should also terminate the CFI unwind chain 1236 // here. Unfortunately clang 3.2 doesn't support the 1237 // necessary CFI directives, so we skip that part. 1238 "xorq %%rbp,%%rbp\n" 1239 1240 /* Call "fn(arg)". */ 1241 "popq %%rax\n" 1242 "popq %%rdi\n" 1243 "call *%%rax\n" 1244 1245 /* Call _exit(%rax). */ 1246 "movq %%rax,%%rdi\n" 1247 "movq %2,%%rax\n" 1248 "syscall\n" 1249 1250 /* Return to parent. */ 1251 "1:\n" 1252 : "=a" (res) 1253 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1254 "S"(child_stack), 1255 "D"(flags), 1256 "d"(parent_tidptr), 1257 "r"(r8), 1258 "r"(r10) 1259 : "memory", "r11", "rcx"); 1260 return res; 1261 } 1262 #elif defined(__mips__) 1263 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1264 int *parent_tidptr, void *newtls, int *child_tidptr) { 1265 long long res; 1266 if (!fn || !child_stack) 1267 return -EINVAL; 1268 CHECK_EQ(0, (uptr)child_stack % 16); 1269 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1270 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1271 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1272 register void *a3 __asm__("$7") = newtls; 1273 register int *a4 __asm__("$8") = child_tidptr; 1274 // We don't have proper CFI directives here because it requires alot of code 1275 // for very marginal benefits. 1276 __asm__ __volatile__( 1277 /* $v0 = syscall($v0 = __NR_clone, 1278 * $a0 = flags, 1279 * $a1 = child_stack, 1280 * $a2 = parent_tidptr, 1281 * $a3 = new_tls, 1282 * $a4 = child_tidptr) 1283 */ 1284 ".cprestore 16;\n" 1285 "move $4,%1;\n" 1286 "move $5,%2;\n" 1287 "move $6,%3;\n" 1288 "move $7,%4;\n" 1289 /* Store the fifth argument on stack 1290 * if we are using 32-bit abi. 1291 */ 1292 #if SANITIZER_WORDSIZE == 32 1293 "lw %5,16($29);\n" 1294 #else 1295 "move $8,%5;\n" 1296 #endif 1297 "li $2,%6;\n" 1298 "syscall;\n" 1299 1300 /* if ($v0 != 0) 1301 * return; 1302 */ 1303 "bnez $2,1f;\n" 1304 1305 /* Call "fn(arg)". */ 1306 #if SANITIZER_WORDSIZE == 32 1307 #ifdef __BIG_ENDIAN__ 1308 "lw $25,4($29);\n" 1309 "lw $4,12($29);\n" 1310 #else 1311 "lw $25,0($29);\n" 1312 "lw $4,8($29);\n" 1313 #endif 1314 #else 1315 "ld $25,0($29);\n" 1316 "ld $4,8($29);\n" 1317 #endif 1318 "jal $25;\n" 1319 1320 /* Call _exit($v0). */ 1321 "move $4,$2;\n" 1322 "li $2,%7;\n" 1323 "syscall;\n" 1324 1325 /* Return to parent. */ 1326 "1:\n" 1327 : "=r" (res) 1328 : "r"(flags), 1329 "r"(child_stack), 1330 "r"(parent_tidptr), 1331 "r"(a3), 1332 "r"(a4), 1333 "i"(__NR_clone), 1334 "i"(__NR_exit) 1335 : "memory", "$29" ); 1336 return res; 1337 } 1338 #elif defined(__aarch64__) 1339 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1340 int *parent_tidptr, void *newtls, int *child_tidptr) { 1341 long long res; 1342 if (!fn || !child_stack) 1343 return -EINVAL; 1344 CHECK_EQ(0, (uptr)child_stack % 16); 1345 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1346 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1347 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1348 1349 register int (*__fn)(void *) __asm__("x0") = fn; 1350 register void *__stack __asm__("x1") = child_stack; 1351 register int __flags __asm__("x2") = flags; 1352 register void *__arg __asm__("x3") = arg; 1353 register int *__ptid __asm__("x4") = parent_tidptr; 1354 register void *__tls __asm__("x5") = newtls; 1355 register int *__ctid __asm__("x6") = child_tidptr; 1356 1357 __asm__ __volatile__( 1358 "mov x0,x2\n" /* flags */ 1359 "mov x2,x4\n" /* ptid */ 1360 "mov x3,x5\n" /* tls */ 1361 "mov x4,x6\n" /* ctid */ 1362 "mov x8,%9\n" /* clone */ 1363 1364 "svc 0x0\n" 1365 1366 /* if (%r0 != 0) 1367 * return %r0; 1368 */ 1369 "cmp x0, #0\n" 1370 "bne 1f\n" 1371 1372 /* In the child, now. Call "fn(arg)". */ 1373 "ldp x1, x0, [sp], #16\n" 1374 "blr x1\n" 1375 1376 /* Call _exit(%r0). */ 1377 "mov x8, %10\n" 1378 "svc 0x0\n" 1379 "1:\n" 1380 1381 : "=r" (res) 1382 : "i"(-EINVAL), 1383 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1384 "r"(__ptid), "r"(__tls), "r"(__ctid), 1385 "i"(__NR_clone), "i"(__NR_exit) 1386 : "x30", "memory"); 1387 return res; 1388 } 1389 #elif defined(__powerpc64__) 1390 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1391 int *parent_tidptr, void *newtls, int *child_tidptr) { 1392 long long res; 1393 // Stack frame structure. 1394 #if SANITIZER_PPC64V1 1395 // Back chain == 0 (SP + 112) 1396 // Frame (112 bytes): 1397 // Parameter save area (SP + 48), 8 doublewords 1398 // TOC save area (SP + 40) 1399 // Link editor doubleword (SP + 32) 1400 // Compiler doubleword (SP + 24) 1401 // LR save area (SP + 16) 1402 // CR save area (SP + 8) 1403 // Back chain (SP + 0) 1404 # define FRAME_SIZE 112 1405 # define FRAME_TOC_SAVE_OFFSET 40 1406 #elif SANITIZER_PPC64V2 1407 // Back chain == 0 (SP + 32) 1408 // Frame (32 bytes): 1409 // TOC save area (SP + 24) 1410 // LR save area (SP + 16) 1411 // CR save area (SP + 8) 1412 // Back chain (SP + 0) 1413 # define FRAME_SIZE 32 1414 # define FRAME_TOC_SAVE_OFFSET 24 1415 #else 1416 # error "Unsupported PPC64 ABI" 1417 #endif 1418 if (!fn || !child_stack) 1419 return -EINVAL; 1420 CHECK_EQ(0, (uptr)child_stack % 16); 1421 1422 register int (*__fn)(void *) __asm__("r3") = fn; 1423 register void *__cstack __asm__("r4") = child_stack; 1424 register int __flags __asm__("r5") = flags; 1425 register void *__arg __asm__("r6") = arg; 1426 register int *__ptidptr __asm__("r7") = parent_tidptr; 1427 register void *__newtls __asm__("r8") = newtls; 1428 register int *__ctidptr __asm__("r9") = child_tidptr; 1429 1430 __asm__ __volatile__( 1431 /* fn and arg are saved across the syscall */ 1432 "mr 28, %5\n\t" 1433 "mr 27, %8\n\t" 1434 1435 /* syscall 1436 r0 == __NR_clone 1437 r3 == flags 1438 r4 == child_stack 1439 r5 == parent_tidptr 1440 r6 == newtls 1441 r7 == child_tidptr */ 1442 "mr 3, %7\n\t" 1443 "mr 5, %9\n\t" 1444 "mr 6, %10\n\t" 1445 "mr 7, %11\n\t" 1446 "li 0, %3\n\t" 1447 "sc\n\t" 1448 1449 /* Test if syscall was successful */ 1450 "cmpdi cr1, 3, 0\n\t" 1451 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1452 "bne- cr1, 1f\n\t" 1453 1454 /* Set up stack frame */ 1455 "li 29, 0\n\t" 1456 "stdu 29, -8(1)\n\t" 1457 "stdu 1, -%12(1)\n\t" 1458 /* Do the function call */ 1459 "std 2, %13(1)\n\t" 1460 #if SANITIZER_PPC64V1 1461 "ld 0, 0(28)\n\t" 1462 "ld 2, 8(28)\n\t" 1463 "mtctr 0\n\t" 1464 #elif SANITIZER_PPC64V2 1465 "mr 12, 28\n\t" 1466 "mtctr 12\n\t" 1467 #else 1468 # error "Unsupported PPC64 ABI" 1469 #endif 1470 "mr 3, 27\n\t" 1471 "bctrl\n\t" 1472 "ld 2, %13(1)\n\t" 1473 1474 /* Call _exit(r3) */ 1475 "li 0, %4\n\t" 1476 "sc\n\t" 1477 1478 /* Return to parent */ 1479 "1:\n\t" 1480 "mr %0, 3\n\t" 1481 : "=r" (res) 1482 : "0" (-1), 1483 "i" (EINVAL), 1484 "i" (__NR_clone), 1485 "i" (__NR_exit), 1486 "r" (__fn), 1487 "r" (__cstack), 1488 "r" (__flags), 1489 "r" (__arg), 1490 "r" (__ptidptr), 1491 "r" (__newtls), 1492 "r" (__ctidptr), 1493 "i" (FRAME_SIZE), 1494 "i" (FRAME_TOC_SAVE_OFFSET) 1495 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1496 return res; 1497 } 1498 #elif defined(__i386__) && SANITIZER_LINUX 1499 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1500 int *parent_tidptr, void *newtls, int *child_tidptr) { 1501 int res; 1502 if (!fn || !child_stack) 1503 return -EINVAL; 1504 CHECK_EQ(0, (uptr)child_stack % 16); 1505 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1506 ((unsigned int *)child_stack)[0] = (uptr)flags; 1507 ((unsigned int *)child_stack)[1] = (uptr)0; 1508 ((unsigned int *)child_stack)[2] = (uptr)fn; 1509 ((unsigned int *)child_stack)[3] = (uptr)arg; 1510 __asm__ __volatile__( 1511 /* %eax = syscall(%eax = SYSCALL(clone), 1512 * %ebx = flags, 1513 * %ecx = child_stack, 1514 * %edx = parent_tidptr, 1515 * %esi = new_tls, 1516 * %edi = child_tidptr) 1517 */ 1518 1519 /* Obtain flags */ 1520 "movl (%%ecx), %%ebx\n" 1521 /* Do the system call */ 1522 "pushl %%ebx\n" 1523 "pushl %%esi\n" 1524 "pushl %%edi\n" 1525 /* Remember the flag value. */ 1526 "movl %%ebx, (%%ecx)\n" 1527 "int $0x80\n" 1528 "popl %%edi\n" 1529 "popl %%esi\n" 1530 "popl %%ebx\n" 1531 1532 /* if (%eax != 0) 1533 * return; 1534 */ 1535 1536 "test %%eax,%%eax\n" 1537 "jnz 1f\n" 1538 1539 /* terminate the stack frame */ 1540 "xorl %%ebp,%%ebp\n" 1541 /* Call FN. */ 1542 "call *%%ebx\n" 1543 #ifdef PIC 1544 "call here\n" 1545 "here:\n" 1546 "popl %%ebx\n" 1547 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1548 #endif 1549 /* Call exit */ 1550 "movl %%eax, %%ebx\n" 1551 "movl %2, %%eax\n" 1552 "int $0x80\n" 1553 "1:\n" 1554 : "=a" (res) 1555 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1556 "c"(child_stack), 1557 "d"(parent_tidptr), 1558 "S"(newtls), 1559 "D"(child_tidptr) 1560 : "memory"); 1561 return res; 1562 } 1563 #elif defined(__arm__) && SANITIZER_LINUX 1564 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1565 int *parent_tidptr, void *newtls, int *child_tidptr) { 1566 unsigned int res; 1567 if (!fn || !child_stack) 1568 return -EINVAL; 1569 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1570 ((unsigned int *)child_stack)[0] = (uptr)fn; 1571 ((unsigned int *)child_stack)[1] = (uptr)arg; 1572 register int r0 __asm__("r0") = flags; 1573 register void *r1 __asm__("r1") = child_stack; 1574 register int *r2 __asm__("r2") = parent_tidptr; 1575 register void *r3 __asm__("r3") = newtls; 1576 register int *r4 __asm__("r4") = child_tidptr; 1577 register int r7 __asm__("r7") = __NR_clone; 1578 1579 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) 1580 # define ARCH_HAS_BX 1581 #endif 1582 #if __ARM_ARCH > 4 1583 # define ARCH_HAS_BLX 1584 #endif 1585 1586 #ifdef ARCH_HAS_BX 1587 # ifdef ARCH_HAS_BLX 1588 # define BLX(R) "blx " #R "\n" 1589 # else 1590 # define BLX(R) "mov lr, pc; bx " #R "\n" 1591 # endif 1592 #else 1593 # define BLX(R) "mov lr, pc; mov pc," #R "\n" 1594 #endif 1595 1596 __asm__ __volatile__( 1597 /* %r0 = syscall(%r7 = SYSCALL(clone), 1598 * %r0 = flags, 1599 * %r1 = child_stack, 1600 * %r2 = parent_tidptr, 1601 * %r3 = new_tls, 1602 * %r4 = child_tidptr) 1603 */ 1604 1605 /* Do the system call */ 1606 "swi 0x0\n" 1607 1608 /* if (%r0 != 0) 1609 * return %r0; 1610 */ 1611 "cmp r0, #0\n" 1612 "bne 1f\n" 1613 1614 /* In the child, now. Call "fn(arg)". */ 1615 "ldr r0, [sp, #4]\n" 1616 "ldr ip, [sp], #8\n" 1617 BLX(ip) 1618 /* Call _exit(%r0). */ 1619 "mov r7, %7\n" 1620 "swi 0x0\n" 1621 "1:\n" 1622 "mov %0, r0\n" 1623 : "=r"(res) 1624 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), 1625 "i"(__NR_exit) 1626 : "memory"); 1627 return res; 1628 } 1629 #endif // defined(__x86_64__) && SANITIZER_LINUX 1630 1631 #if SANITIZER_LINUX 1632 int internal_uname(struct utsname *buf) { 1633 return internal_syscall(SYSCALL(uname), buf); 1634 } 1635 #endif 1636 1637 #if SANITIZER_ANDROID 1638 #if __ANDROID_API__ < 21 1639 extern "C" __attribute__((weak)) int dl_iterate_phdr( 1640 int (*)(struct dl_phdr_info *, size_t, void *), void *); 1641 #endif 1642 1643 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, 1644 void *data) { 1645 // Any name starting with "lib" indicates a bug in L where library base names 1646 // are returned instead of paths. 1647 if (info->dlpi_name && info->dlpi_name[0] == 'l' && 1648 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { 1649 *(bool *)data = true; 1650 return 1; 1651 } 1652 return 0; 1653 } 1654 1655 static atomic_uint32_t android_api_level; 1656 1657 static AndroidApiLevel AndroidDetectApiLevelStatic() { 1658 #if __ANDROID_API__ <= 19 1659 return ANDROID_KITKAT; 1660 #elif __ANDROID_API__ <= 22 1661 return ANDROID_LOLLIPOP_MR1; 1662 #else 1663 return ANDROID_POST_LOLLIPOP; 1664 #endif 1665 } 1666 1667 static AndroidApiLevel AndroidDetectApiLevel() { 1668 if (!&dl_iterate_phdr) 1669 return ANDROID_KITKAT; // K or lower 1670 bool base_name_seen = false; 1671 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); 1672 if (base_name_seen) 1673 return ANDROID_LOLLIPOP_MR1; // L MR1 1674 return ANDROID_POST_LOLLIPOP; // post-L 1675 // Plain L (API level 21) is completely broken wrt ASan and not very 1676 // interesting to detect. 1677 } 1678 1679 extern "C" __attribute__((weak)) void* _DYNAMIC; 1680 1681 AndroidApiLevel AndroidGetApiLevel() { 1682 AndroidApiLevel level = 1683 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); 1684 if (level) return level; 1685 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic() 1686 : AndroidDetectApiLevel(); 1687 atomic_store(&android_api_level, level, memory_order_relaxed); 1688 return level; 1689 } 1690 1691 #endif 1692 1693 static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1694 switch (signum) { 1695 case SIGABRT: 1696 return common_flags()->handle_abort; 1697 case SIGILL: 1698 return common_flags()->handle_sigill; 1699 case SIGTRAP: 1700 return common_flags()->handle_sigtrap; 1701 case SIGFPE: 1702 return common_flags()->handle_sigfpe; 1703 case SIGSEGV: 1704 return common_flags()->handle_segv; 1705 case SIGBUS: 1706 return common_flags()->handle_sigbus; 1707 } 1708 return kHandleSignalNo; 1709 } 1710 1711 HandleSignalMode GetHandleSignalMode(int signum) { 1712 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1713 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1714 return kHandleSignalExclusive; 1715 return result; 1716 } 1717 1718 #if !SANITIZER_GO 1719 void *internal_start_thread(void *(*func)(void *arg), void *arg) { 1720 // Start the thread with signals blocked, otherwise it can steal user signals. 1721 __sanitizer_sigset_t set, old; 1722 internal_sigfillset(&set); 1723 #if SANITIZER_LINUX && !SANITIZER_ANDROID 1724 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 1725 // on any thread, setuid call hangs (see test/tsan/setuid.c). 1726 internal_sigdelset(&set, 33); 1727 #endif 1728 internal_sigprocmask(SIG_SETMASK, &set, &old); 1729 void *th; 1730 real_pthread_create(&th, nullptr, func, arg); 1731 internal_sigprocmask(SIG_SETMASK, &old, nullptr); 1732 return th; 1733 } 1734 1735 void internal_join_thread(void *th) { 1736 real_pthread_join(th, nullptr); 1737 } 1738 #else 1739 void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; } 1740 1741 void internal_join_thread(void *th) {} 1742 #endif 1743 1744 #if defined(__aarch64__) 1745 // Android headers in the older NDK releases miss this definition. 1746 struct __sanitizer_esr_context { 1747 struct _aarch64_ctx head; 1748 uint64_t esr; 1749 }; 1750 1751 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1752 static const u32 kEsrMagic = 0x45535201; 1753 u8 *aux = ucontext->uc_mcontext.__reserved; 1754 while (true) { 1755 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1756 if (ctx->size == 0) break; 1757 if (ctx->magic == kEsrMagic) { 1758 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1759 return true; 1760 } 1761 aux += ctx->size; 1762 } 1763 return false; 1764 } 1765 #endif 1766 1767 #if SANITIZER_OPENBSD 1768 using Context = sigcontext; 1769 #else 1770 using Context = ucontext_t; 1771 #endif 1772 1773 SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1774 Context *ucontext = (Context *)context; 1775 #if defined(__x86_64__) || defined(__i386__) 1776 static const uptr PF_WRITE = 1U << 1; 1777 #if SANITIZER_FREEBSD 1778 uptr err = ucontext->uc_mcontext.mc_err; 1779 #elif SANITIZER_NETBSD 1780 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1781 #elif SANITIZER_OPENBSD 1782 uptr err = ucontext->sc_err; 1783 #elif SANITIZER_SOLARIS && defined(__i386__) 1784 const int Err = 13; 1785 uptr err = ucontext->uc_mcontext.gregs[Err]; 1786 #else 1787 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1788 #endif // SANITIZER_FREEBSD 1789 return err & PF_WRITE ? WRITE : READ; 1790 #elif defined(__mips__) 1791 uint32_t *exception_source; 1792 uint32_t faulty_instruction; 1793 uint32_t op_code; 1794 1795 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 1796 faulty_instruction = (uint32_t)(*exception_source); 1797 1798 op_code = (faulty_instruction >> 26) & 0x3f; 1799 1800 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 1801 switch (op_code) { 1802 case 0x28: // sb 1803 case 0x29: // sh 1804 case 0x2b: // sw 1805 case 0x3f: // sd 1806 #if __mips_isa_rev < 6 1807 case 0x2c: // sdl 1808 case 0x2d: // sdr 1809 case 0x2a: // swl 1810 case 0x2e: // swr 1811 #endif 1812 return SignalContext::WRITE; 1813 1814 case 0x20: // lb 1815 case 0x24: // lbu 1816 case 0x21: // lh 1817 case 0x25: // lhu 1818 case 0x23: // lw 1819 case 0x27: // lwu 1820 case 0x37: // ld 1821 #if __mips_isa_rev < 6 1822 case 0x1a: // ldl 1823 case 0x1b: // ldr 1824 case 0x22: // lwl 1825 case 0x26: // lwr 1826 #endif 1827 return SignalContext::READ; 1828 #if __mips_isa_rev == 6 1829 case 0x3b: // pcrel 1830 op_code = (faulty_instruction >> 19) & 0x3; 1831 switch (op_code) { 1832 case 0x1: // lwpc 1833 case 0x2: // lwupc 1834 return SignalContext::READ; 1835 } 1836 #endif 1837 } 1838 return SignalContext::UNKNOWN; 1839 #elif defined(__arm__) 1840 static const uptr FSR_WRITE = 1U << 11; 1841 uptr fsr = ucontext->uc_mcontext.error_code; 1842 return fsr & FSR_WRITE ? WRITE : READ; 1843 #elif defined(__aarch64__) 1844 static const u64 ESR_ELx_WNR = 1U << 6; 1845 u64 esr; 1846 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN; 1847 return esr & ESR_ELx_WNR ? WRITE : READ; 1848 #elif defined(__sparc__) 1849 // Decode the instruction to determine the access type. 1850 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 1851 #if SANITIZER_SOLARIS 1852 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 1853 #else 1854 // Historical BSDism here. 1855 struct sigcontext *scontext = (struct sigcontext *)context; 1856 #if defined(__arch64__) 1857 uptr pc = scontext->sigc_regs.tpc; 1858 #else 1859 uptr pc = scontext->si_regs.pc; 1860 #endif 1861 #endif 1862 u32 instr = *(u32 *)pc; 1863 return (instr >> 21) & 1 ? WRITE: READ; 1864 #elif defined(__riscv) 1865 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC]; 1866 unsigned faulty_instruction = *(uint16_t *)pc; 1867 1868 #if defined(__riscv_compressed) 1869 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction 1870 // set op_bits to the instruction bits [1, 0, 15, 14, 13] 1871 unsigned op_bits = 1872 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13); 1873 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive 1874 switch (op_bits) { 1875 case 0b10'010: // c.lwsp (rd != x0) 1876 #if __riscv_xlen == 64 1877 case 0b10'011: // c.ldsp (rd != x0) 1878 #endif 1879 return rd ? SignalContext::READ : SignalContext::UNKNOWN; 1880 case 0b00'010: // c.lw 1881 #if __riscv_flen >= 32 && __riscv_xlen == 32 1882 case 0b10'011: // c.flwsp 1883 #endif 1884 #if __riscv_flen >= 32 || __riscv_xlen == 64 1885 case 0b00'011: // c.flw / c.ld 1886 #endif 1887 #if __riscv_flen == 64 1888 case 0b00'001: // c.fld 1889 case 0b10'001: // c.fldsp 1890 #endif 1891 return SignalContext::READ; 1892 case 0b00'110: // c.sw 1893 case 0b10'110: // c.swsp 1894 #if __riscv_flen >= 32 || __riscv_xlen == 64 1895 case 0b00'111: // c.fsw / c.sd 1896 case 0b10'111: // c.fswsp / c.sdsp 1897 #endif 1898 #if __riscv_flen == 64 1899 case 0b00'101: // c.fsd 1900 case 0b10'101: // c.fsdsp 1901 #endif 1902 return SignalContext::WRITE; 1903 default: 1904 return SignalContext::UNKNOWN; 1905 } 1906 } 1907 #endif 1908 1909 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits 1910 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive 1911 switch (opcode) { 1912 case 0b0000011: // loads 1913 switch (funct3) { 1914 case 0b000: // lb 1915 case 0b001: // lh 1916 case 0b010: // lw 1917 #if __riscv_xlen == 64 1918 case 0b011: // ld 1919 #endif 1920 case 0b100: // lbu 1921 case 0b101: // lhu 1922 return SignalContext::READ; 1923 default: 1924 return SignalContext::UNKNOWN; 1925 } 1926 case 0b0100011: // stores 1927 switch (funct3) { 1928 case 0b000: // sb 1929 case 0b001: // sh 1930 case 0b010: // sw 1931 #if __riscv_xlen == 64 1932 case 0b011: // sd 1933 #endif 1934 return SignalContext::WRITE; 1935 default: 1936 return SignalContext::UNKNOWN; 1937 } 1938 #if __riscv_flen >= 32 1939 case 0b0000111: // floating-point loads 1940 switch (funct3) { 1941 case 0b010: // flw 1942 #if __riscv_flen == 64 1943 case 0b011: // fld 1944 #endif 1945 return SignalContext::READ; 1946 default: 1947 return SignalContext::UNKNOWN; 1948 } 1949 case 0b0100111: // floating-point stores 1950 switch (funct3) { 1951 case 0b010: // fsw 1952 #if __riscv_flen == 64 1953 case 0b011: // fsd 1954 #endif 1955 return SignalContext::WRITE; 1956 default: 1957 return SignalContext::UNKNOWN; 1958 } 1959 #endif 1960 default: 1961 return SignalContext::UNKNOWN; 1962 } 1963 #else 1964 (void)ucontext; 1965 return UNKNOWN; // FIXME: Implement. 1966 #endif 1967 } 1968 1969 bool SignalContext::IsTrueFaultingAddress() const { 1970 auto si = static_cast<const siginfo_t *>(siginfo); 1971 // SIGSEGV signals without a true fault address have si_code set to 128. 1972 return si->si_signo == SIGSEGV && si->si_code != 128; 1973 } 1974 1975 void SignalContext::DumpAllRegisters(void *context) { 1976 // FIXME: Implement this. 1977 } 1978 1979 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 1980 #if SANITIZER_NETBSD 1981 // This covers all NetBSD architectures 1982 ucontext_t *ucontext = (ucontext_t *)context; 1983 *pc = _UC_MACHINE_PC(ucontext); 1984 *bp = _UC_MACHINE_FP(ucontext); 1985 *sp = _UC_MACHINE_SP(ucontext); 1986 #elif defined(__arm__) 1987 ucontext_t *ucontext = (ucontext_t*)context; 1988 *pc = ucontext->uc_mcontext.arm_pc; 1989 *bp = ucontext->uc_mcontext.arm_fp; 1990 *sp = ucontext->uc_mcontext.arm_sp; 1991 #elif defined(__aarch64__) 1992 ucontext_t *ucontext = (ucontext_t*)context; 1993 *pc = ucontext->uc_mcontext.pc; 1994 *bp = ucontext->uc_mcontext.regs[29]; 1995 *sp = ucontext->uc_mcontext.sp; 1996 #elif defined(__hppa__) 1997 ucontext_t *ucontext = (ucontext_t*)context; 1998 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 1999 /* GCC uses %r3 whenever a frame pointer is needed. */ 2000 *bp = ucontext->uc_mcontext.sc_gr[3]; 2001 *sp = ucontext->uc_mcontext.sc_gr[30]; 2002 #elif defined(__x86_64__) 2003 # if SANITIZER_FREEBSD 2004 ucontext_t *ucontext = (ucontext_t*)context; 2005 *pc = ucontext->uc_mcontext.mc_rip; 2006 *bp = ucontext->uc_mcontext.mc_rbp; 2007 *sp = ucontext->uc_mcontext.mc_rsp; 2008 #elif SANITIZER_OPENBSD 2009 sigcontext *ucontext = (sigcontext *)context; 2010 *pc = ucontext->sc_rip; 2011 *bp = ucontext->sc_rbp; 2012 *sp = ucontext->sc_rsp; 2013 # else 2014 ucontext_t *ucontext = (ucontext_t*)context; 2015 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 2016 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 2017 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 2018 # endif 2019 #elif defined(__i386__) 2020 # if SANITIZER_FREEBSD 2021 ucontext_t *ucontext = (ucontext_t*)context; 2022 *pc = ucontext->uc_mcontext.mc_eip; 2023 *bp = ucontext->uc_mcontext.mc_ebp; 2024 *sp = ucontext->uc_mcontext.mc_esp; 2025 #elif SANITIZER_OPENBSD 2026 sigcontext *ucontext = (sigcontext *)context; 2027 *pc = ucontext->sc_eip; 2028 *bp = ucontext->sc_ebp; 2029 *sp = ucontext->sc_esp; 2030 # else 2031 ucontext_t *ucontext = (ucontext_t*)context; 2032 # if SANITIZER_SOLARIS 2033 /* Use the numeric values: the symbolic ones are undefined by llvm 2034 include/llvm/Support/Solaris.h. */ 2035 # ifndef REG_EIP 2036 # define REG_EIP 14 // REG_PC 2037 # endif 2038 # ifndef REG_EBP 2039 # define REG_EBP 6 // REG_FP 2040 # endif 2041 # ifndef REG_ESP 2042 # define REG_ESP 17 // REG_SP 2043 # endif 2044 # endif 2045 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 2046 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 2047 *sp = ucontext->uc_mcontext.gregs[REG_ESP]; 2048 # endif 2049 #elif defined(__powerpc__) || defined(__powerpc64__) 2050 ucontext_t *ucontext = (ucontext_t*)context; 2051 *pc = ucontext->uc_mcontext.regs->nip; 2052 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 2053 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 2054 // pointer, but GCC always uses r31 when we need a frame pointer. 2055 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 2056 #elif defined(__sparc__) 2057 #if defined(__arch64__) || defined(__sparcv9) 2058 #define STACK_BIAS 2047 2059 #else 2060 #define STACK_BIAS 0 2061 # endif 2062 # if SANITIZER_SOLARIS 2063 ucontext_t *ucontext = (ucontext_t *)context; 2064 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 2065 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS; 2066 #else 2067 // Historical BSDism here. 2068 struct sigcontext *scontext = (struct sigcontext *)context; 2069 #if defined(__arch64__) 2070 *pc = scontext->sigc_regs.tpc; 2071 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS; 2072 #else 2073 *pc = scontext->si_regs.pc; 2074 *sp = scontext->si_regs.u_regs[14]; 2075 #endif 2076 # endif 2077 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS; 2078 #elif defined(__mips__) 2079 ucontext_t *ucontext = (ucontext_t*)context; 2080 *pc = ucontext->uc_mcontext.pc; 2081 *bp = ucontext->uc_mcontext.gregs[30]; 2082 *sp = ucontext->uc_mcontext.gregs[29]; 2083 #elif defined(__s390__) 2084 ucontext_t *ucontext = (ucontext_t*)context; 2085 # if defined(__s390x__) 2086 *pc = ucontext->uc_mcontext.psw.addr; 2087 # else 2088 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 2089 # endif 2090 *bp = ucontext->uc_mcontext.gregs[11]; 2091 *sp = ucontext->uc_mcontext.gregs[15]; 2092 #elif defined(__riscv) 2093 ucontext_t *ucontext = (ucontext_t*)context; 2094 *pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2095 *bp = ucontext->uc_mcontext.__gregs[REG_S0]; 2096 *sp = ucontext->uc_mcontext.__gregs[REG_SP]; 2097 #else 2098 # error "Unsupported arch" 2099 #endif 2100 } 2101 2102 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 2103 2104 void InitializePlatformEarly() { 2105 // Do nothing. 2106 } 2107 2108 void MaybeReexec() { 2109 // No need to re-exec on Linux. 2110 } 2111 2112 void CheckASLR() { 2113 #if SANITIZER_NETBSD 2114 int mib[3]; 2115 int paxflags; 2116 uptr len = sizeof(paxflags); 2117 2118 mib[0] = CTL_PROC; 2119 mib[1] = internal_getpid(); 2120 mib[2] = PROC_PID_PAXFLAGS; 2121 2122 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2123 Printf("sysctl failed\n"); 2124 Die(); 2125 } 2126 2127 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2128 Printf("This sanitizer is not compatible with enabled ASLR\n"); 2129 Die(); 2130 } 2131 #elif SANITIZER_PPC64V2 2132 // Disable ASLR for Linux PPC64LE. 2133 int old_personality = personality(0xffffffff); 2134 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2135 VReport(1, "WARNING: Program is being run with address space layout " 2136 "randomization (ASLR) enabled which prevents the thread and " 2137 "memory sanitizers from working on powerpc64le.\n" 2138 "ASLR will be disabled and the program re-executed.\n"); 2139 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2140 ReExec(); 2141 } 2142 #elif SANITIZER_FREEBSD 2143 int aslr_pie; 2144 uptr len = sizeof(aslr_pie); 2145 #if SANITIZER_WORDSIZE == 64 2146 if (UNLIKELY(internal_sysctlbyname("kern.elf64.aslr.pie_enable", 2147 &aslr_pie, &len, NULL, 0) == -1)) { 2148 // We're making things less 'dramatic' here since 2149 // the OID is not necessarily guaranteed to be here 2150 // just yet regarding FreeBSD release 2151 return; 2152 } 2153 2154 if (aslr_pie > 0) { 2155 Printf("This sanitizer is not compatible with enabled ASLR " 2156 "and binaries compiled with PIE\n"); 2157 Die(); 2158 } 2159 #endif 2160 // there might be 32 bits compat for 64 bits 2161 if (UNLIKELY(internal_sysctlbyname("kern.elf32.aslr.pie_enable", 2162 &aslr_pie, &len, NULL, 0) == -1)) { 2163 return; 2164 } 2165 2166 if (aslr_pie > 0) { 2167 Printf("This sanitizer is not compatible with enabled ASLR " 2168 "and binaries compiled with PIE\n"); 2169 Die(); 2170 } 2171 #else 2172 // Do nothing 2173 #endif 2174 } 2175 2176 void CheckMPROTECT() { 2177 #if SANITIZER_NETBSD 2178 int mib[3]; 2179 int paxflags; 2180 uptr len = sizeof(paxflags); 2181 2182 mib[0] = CTL_PROC; 2183 mib[1] = internal_getpid(); 2184 mib[2] = PROC_PID_PAXFLAGS; 2185 2186 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2187 Printf("sysctl failed\n"); 2188 Die(); 2189 } 2190 2191 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2192 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2193 Die(); 2194 } 2195 #else 2196 // Do nothing 2197 #endif 2198 } 2199 2200 void PrintModuleMap() { } 2201 2202 void CheckNoDeepBind(const char *filename, int flag) { 2203 #ifdef RTLD_DEEPBIND 2204 if (flag & RTLD_DEEPBIND) { 2205 Report( 2206 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2207 " which is incompatibe with sanitizer runtime " 2208 "(see https://github.com/google/sanitizers/issues/611 for details" 2209 "). If you want to run %s library under sanitizers please remove " 2210 "RTLD_DEEPBIND from dlopen flags.\n", 2211 filename, filename); 2212 Die(); 2213 } 2214 #endif 2215 } 2216 2217 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2218 uptr *largest_gap_found, 2219 uptr *max_occupied_addr) { 2220 UNREACHABLE("FindAvailableMemoryRange is not available"); 2221 return 0; 2222 } 2223 2224 bool GetRandom(void *buffer, uptr length, bool blocking) { 2225 if (!buffer || !length || length > 256) 2226 return false; 2227 #if SANITIZER_USE_GETENTROPY 2228 uptr rnd = getentropy(buffer, length); 2229 int rverrno = 0; 2230 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2231 return false; 2232 else if (rnd == 0) 2233 return true; 2234 #endif // SANITIZER_USE_GETENTROPY 2235 2236 #if SANITIZER_USE_GETRANDOM 2237 static atomic_uint8_t skip_getrandom_syscall; 2238 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2239 // Up to 256 bytes, getrandom will not be interrupted. 2240 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2241 blocking ? 0 : GRND_NONBLOCK); 2242 int rverrno = 0; 2243 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2244 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2245 else if (res == length) 2246 return true; 2247 } 2248 #endif // SANITIZER_USE_GETRANDOM 2249 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2250 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2251 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2252 if (internal_iserror(fd)) 2253 return false; 2254 uptr res = internal_read(fd, buffer, length); 2255 if (internal_iserror(res)) 2256 return false; 2257 internal_close(fd); 2258 return true; 2259 } 2260 2261 } // namespace __sanitizer 2262 2263 #endif 2264