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