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 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 extern "C" { 557 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 558 } 559 #endif 560 561 #if !SANITIZER_GO && !SANITIZER_FREEBSD && !SANITIZER_NETBSD && \ 562 !SANITIZER_OPENBSD 563 static void ReadNullSepFileToArray(const char *path, char ***arr, 564 int arr_size) { 565 char *buff; 566 uptr buff_size; 567 uptr buff_len; 568 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 569 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 570 (*arr)[0] = nullptr; 571 return; 572 } 573 (*arr)[0] = buff; 574 int count, i; 575 for (count = 1, i = 1; ; i++) { 576 if (buff[i] == 0) { 577 if (buff[i+1] == 0) break; 578 (*arr)[count] = &buff[i+1]; 579 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 580 count++; 581 } 582 } 583 (*arr)[count] = nullptr; 584 } 585 #endif 586 587 #if !SANITIZER_OPENBSD 588 static void GetArgsAndEnv(char ***argv, char ***envp) { 589 #if SANITIZER_FREEBSD 590 // On FreeBSD, retrieving the argument and environment arrays is done via the 591 // kern.ps_strings sysctl, which returns a pointer to a structure containing 592 // this information. See also <sys/exec.h>. 593 ps_strings *pss; 594 uptr sz = sizeof(pss); 595 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 596 Printf("sysctl kern.ps_strings failed\n"); 597 Die(); 598 } 599 *argv = pss->ps_argvstr; 600 *envp = pss->ps_envstr; 601 #elif SANITIZER_NETBSD 602 *argv = __ps_strings->ps_argvstr; 603 *envp = __ps_strings->ps_envstr; 604 #else // SANITIZER_FREEBSD 605 #if !SANITIZER_GO 606 if (&__libc_stack_end) { 607 #endif // !SANITIZER_GO 608 uptr* stack_end = (uptr*)__libc_stack_end; 609 int argc = *stack_end; 610 *argv = (char**)(stack_end + 1); 611 *envp = (char**)(stack_end + argc + 2); 612 #if !SANITIZER_GO 613 } else { 614 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 615 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 616 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 617 } 618 #endif // !SANITIZER_GO 619 #endif // SANITIZER_FREEBSD 620 } 621 622 char **GetArgv() { 623 char **argv, **envp; 624 GetArgsAndEnv(&argv, &envp); 625 return argv; 626 } 627 628 char **GetEnviron() { 629 char **argv, **envp; 630 GetArgsAndEnv(&argv, &envp); 631 return envp; 632 } 633 634 #endif // !SANITIZER_OPENBSD 635 636 #if !SANITIZER_SOLARIS 637 enum MutexState { 638 MtxUnlocked = 0, 639 MtxLocked = 1, 640 MtxSleeping = 2 641 }; 642 643 BlockingMutex::BlockingMutex() { 644 internal_memset(this, 0, sizeof(*this)); 645 } 646 647 void BlockingMutex::Lock() { 648 CHECK_EQ(owner_, 0); 649 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 650 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked) 651 return; 652 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) { 653 #if SANITIZER_FREEBSD 654 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0); 655 #elif SANITIZER_NETBSD 656 sched_yield(); /* No userspace futex-like synchronization */ 657 #else 658 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT_PRIVATE, MtxSleeping, 659 0, 0, 0); 660 #endif 661 } 662 } 663 664 void BlockingMutex::Unlock() { 665 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 666 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release); 667 CHECK_NE(v, MtxUnlocked); 668 if (v == MtxSleeping) { 669 #if SANITIZER_FREEBSD 670 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0); 671 #elif SANITIZER_NETBSD 672 /* No userspace futex-like synchronization */ 673 #else 674 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0); 675 #endif 676 } 677 } 678 679 void BlockingMutex::CheckLocked() { 680 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 681 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed)); 682 } 683 #endif // !SANITIZER_SOLARIS 684 685 // ----------------- sanitizer_linux.h 686 // The actual size of this structure is specified by d_reclen. 687 // Note that getdents64 uses a different structure format. We only provide the 688 // 32-bit syscall here. 689 #if SANITIZER_NETBSD 690 // Not used 691 #elif SANITIZER_OPENBSD 692 // struct dirent is different for Linux and us. At this moment, we use only 693 // d_fileno (Linux call this d_ino), d_reclen, and d_name. 694 struct linux_dirent { 695 u64 d_ino; // d_fileno 696 u16 d_reclen; 697 u16 d_namlen; // not used 698 u8 d_type; // not used 699 char d_name[NAME_MAX + 1]; 700 }; 701 #else 702 struct linux_dirent { 703 #if SANITIZER_X32 || defined(__aarch64__) 704 u64 d_ino; 705 u64 d_off; 706 #else 707 unsigned long d_ino; 708 unsigned long d_off; 709 #endif 710 unsigned short d_reclen; 711 #ifdef __aarch64__ 712 unsigned char d_type; 713 #endif 714 char d_name[256]; 715 }; 716 #endif 717 718 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 719 // Syscall wrappers. 720 uptr internal_ptrace(int request, int pid, void *addr, void *data) { 721 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 722 (uptr)data); 723 } 724 725 uptr internal_waitpid(int pid, int *status, int options) { 726 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 727 0 /* rusage */); 728 } 729 730 uptr internal_getpid() { 731 return internal_syscall(SYSCALL(getpid)); 732 } 733 734 uptr internal_getppid() { 735 return internal_syscall(SYSCALL(getppid)); 736 } 737 738 int internal_dlinfo(void *handle, int request, void *p) { 739 #if SANITIZER_FREEBSD 740 return dlinfo(handle, request, p); 741 #else 742 UNIMPLEMENTED(); 743 #endif 744 } 745 746 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 747 #if SANITIZER_FREEBSD 748 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 749 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 750 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 751 #else 752 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 753 #endif 754 } 755 756 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 757 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 758 } 759 760 #if SANITIZER_LINUX 761 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 762 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 763 } 764 #endif 765 766 uptr internal_sigaltstack(const void *ss, void *oss) { 767 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 768 } 769 770 int internal_fork() { 771 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 772 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 773 #else 774 return internal_syscall(SYSCALL(fork)); 775 #endif 776 } 777 778 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 779 int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 780 uptr *oldlenp, const void *newp, uptr newlen) { 781 #if SANITIZER_OPENBSD 782 return sysctl(name, namelen, oldp, (size_t *)oldlenp, (void *)newp, 783 (size_t)newlen); 784 #else 785 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 786 (size_t *)oldlenp, newp, (size_t)newlen); 787 #endif 788 } 789 790 #if SANITIZER_FREEBSD 791 int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 792 const void *newp, uptr newlen) { 793 static decltype(sysctlbyname) *real = nullptr; 794 if (!real) 795 real = (decltype(sysctlbyname) *)dlsym(RTLD_NEXT, "sysctlbyname"); 796 CHECK(real); 797 return real(sname, oldp, (size_t *)oldlenp, newp, (size_t)newlen); 798 } 799 #endif 800 #endif 801 802 #if SANITIZER_LINUX 803 #define SA_RESTORER 0x04000000 804 // Doesn't set sa_restorer if the caller did not set it, so use with caution 805 //(see below). 806 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 807 __sanitizer_kernel_sigaction_t k_act, k_oldact; 808 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 809 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 810 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 811 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 812 if (u_act) { 813 k_act.handler = u_act->handler; 814 k_act.sigaction = u_act->sigaction; 815 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 816 sizeof(__sanitizer_kernel_sigset_t)); 817 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 818 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 819 // FIXME: most often sa_restorer is unset, however the kernel requires it 820 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 821 // If sa_restorer passed to the kernel is NULL, the program may crash upon 822 // signal delivery or fail to unwind the stack in the signal handler. 823 // libc implementation of sigaction() passes its own restorer to 824 // rt_sigaction, so we need to do the same (we'll need to reimplement the 825 // restorers; for x86_64 the restorer address can be obtained from 826 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 827 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 828 k_act.sa_restorer = u_act->sa_restorer; 829 #endif 830 } 831 832 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 833 (uptr)(u_act ? &k_act : nullptr), 834 (uptr)(u_oldact ? &k_oldact : nullptr), 835 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 836 837 if ((result == 0) && u_oldact) { 838 u_oldact->handler = k_oldact.handler; 839 u_oldact->sigaction = k_oldact.sigaction; 840 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 841 sizeof(__sanitizer_kernel_sigset_t)); 842 u_oldact->sa_flags = k_oldact.sa_flags; 843 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 844 u_oldact->sa_restorer = k_oldact.sa_restorer; 845 #endif 846 } 847 return result; 848 } 849 #endif // SANITIZER_LINUX 850 851 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 852 __sanitizer_sigset_t *oldset) { 853 #if SANITIZER_FREEBSD || SANITIZER_OPENBSD 854 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 855 #else 856 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 857 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 858 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, 859 (uptr)&k_set->sig[0], (uptr)&k_oldset->sig[0], 860 sizeof(__sanitizer_kernel_sigset_t)); 861 #endif 862 } 863 864 void internal_sigfillset(__sanitizer_sigset_t *set) { 865 internal_memset(set, 0xff, sizeof(*set)); 866 } 867 868 void internal_sigemptyset(__sanitizer_sigset_t *set) { 869 internal_memset(set, 0, sizeof(*set)); 870 } 871 872 #if SANITIZER_LINUX 873 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 874 signum -= 1; 875 CHECK_GE(signum, 0); 876 CHECK_LT(signum, sizeof(*set) * 8); 877 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 878 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 879 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 880 k_set->sig[idx] &= ~(1 << bit); 881 } 882 883 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 884 signum -= 1; 885 CHECK_GE(signum, 0); 886 CHECK_LT(signum, sizeof(*set) * 8); 887 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 888 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 889 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 890 return k_set->sig[idx] & (1 << bit); 891 } 892 #elif SANITIZER_FREEBSD 893 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 894 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 895 sigdelset(rset, signum); 896 } 897 898 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 899 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 900 return sigismember(rset, signum); 901 } 902 #endif 903 #endif // !SANITIZER_SOLARIS 904 905 #if !SANITIZER_NETBSD 906 // ThreadLister implementation. 907 ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) { 908 char task_directory_path[80]; 909 internal_snprintf(task_directory_path, sizeof(task_directory_path), 910 "/proc/%d/task/", pid); 911 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 912 if (internal_iserror(descriptor_)) { 913 Report("Can't open /proc/%d/task for reading.\n", pid); 914 } 915 } 916 917 ThreadLister::Result ThreadLister::ListThreads( 918 InternalMmapVector<tid_t> *threads) { 919 if (internal_iserror(descriptor_)) 920 return Error; 921 internal_lseek(descriptor_, 0, SEEK_SET); 922 threads->clear(); 923 924 Result result = Ok; 925 for (bool first_read = true;; first_read = false) { 926 // Resize to max capacity if it was downsized by IsAlive. 927 buffer_.resize(buffer_.capacity()); 928 CHECK_GE(buffer_.size(), 4096); 929 uptr read = internal_getdents( 930 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size()); 931 if (!read) 932 return result; 933 if (internal_iserror(read)) { 934 Report("Can't read directory entries from /proc/%d/task.\n", pid_); 935 return Error; 936 } 937 938 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 939 struct linux_dirent *entry = (struct linux_dirent *)begin; 940 begin += entry->d_reclen; 941 if (entry->d_ino == 1) { 942 // Inode 1 is for bad blocks and also can be a reason for early return. 943 // Should be emitted if kernel tried to output terminating thread. 944 // See proc_task_readdir implementation in Linux. 945 result = Incomplete; 946 } 947 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 948 threads->push_back(internal_atoll(entry->d_name)); 949 } 950 951 // Now we are going to detect short-read or early EOF. In such cases Linux 952 // can return inconsistent list with missing alive threads. 953 // Code will just remember that the list can be incomplete but it will 954 // continue reads to return as much as possible. 955 if (!first_read) { 956 // The first one was a short-read by definition. 957 result = Incomplete; 958 } else if (read > buffer_.size() - 1024) { 959 // Read was close to the buffer size. So double the size and assume the 960 // worst. 961 buffer_.resize(buffer_.size() * 2); 962 result = Incomplete; 963 } else if (!threads->empty() && !IsAlive(threads->back())) { 964 // Maybe Linux early returned from read on terminated thread (!pid_alive) 965 // and failed to restore read position. 966 // See next_tid and proc_task_instantiate in Linux. 967 result = Incomplete; 968 } 969 } 970 } 971 972 bool ThreadLister::IsAlive(int tid) { 973 // /proc/%d/task/%d/status uses same call to detect alive threads as 974 // proc_task_readdir. See task_state implementation in Linux. 975 char path[80]; 976 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid); 977 if (!ReadFileToVector(path, &buffer_) || buffer_.empty()) 978 return false; 979 buffer_.push_back(0); 980 static const char kPrefix[] = "\nPPid:"; 981 const char *field = internal_strstr(buffer_.data(), kPrefix); 982 if (!field) 983 return false; 984 field += internal_strlen(kPrefix); 985 return (int)internal_atoll(field) != 0; 986 } 987 988 ThreadLister::~ThreadLister() { 989 if (!internal_iserror(descriptor_)) 990 internal_close(descriptor_); 991 } 992 #endif 993 994 #if SANITIZER_WORDSIZE == 32 995 // Take care of unusable kernel area in top gigabyte. 996 static uptr GetKernelAreaSize() { 997 #if SANITIZER_LINUX && !SANITIZER_X32 998 const uptr gbyte = 1UL << 30; 999 1000 // Firstly check if there are writable segments 1001 // mapped to top gigabyte (e.g. stack). 1002 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 1003 if (proc_maps.Error()) 1004 return 0; 1005 MemoryMappedSegment segment; 1006 while (proc_maps.Next(&segment)) { 1007 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0; 1008 } 1009 1010 #if !SANITIZER_ANDROID 1011 // Even if nothing is mapped, top Gb may still be accessible 1012 // if we are running on 64-bit kernel. 1013 // Uname may report misleading results if personality type 1014 // is modified (e.g. under schroot) so check this as well. 1015 struct utsname uname_info; 1016 int pers = personality(0xffffffffUL); 1017 if (!(pers & PER_MASK) 1018 && 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 return EXEC_PAGESIZE; 1076 #elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1077 // Use sysctl as sysconf can trigger interceptors internally. 1078 int pz = 0; 1079 uptr pzl = sizeof(pz); 1080 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1081 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1082 CHECK_EQ(rv, 0); 1083 return (uptr)pz; 1084 #elif SANITIZER_USE_GETAUXVAL 1085 return getauxval(AT_PAGESZ); 1086 #else 1087 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1088 #endif 1089 } 1090 #endif // !SANITIZER_ANDROID 1091 1092 #if !SANITIZER_OPENBSD 1093 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { 1094 #if SANITIZER_SOLARIS 1095 const char *default_module_name = getexecname(); 1096 CHECK_NE(default_module_name, NULL); 1097 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1098 #else 1099 #if SANITIZER_FREEBSD || SANITIZER_NETBSD 1100 #if SANITIZER_FREEBSD 1101 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1102 #else 1103 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1104 #endif 1105 const char *default_module_name = "kern.proc.pathname"; 1106 uptr Size = buf_len; 1107 bool IsErr = 1108 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1109 int readlink_error = IsErr ? errno : 0; 1110 uptr module_name_len = Size; 1111 #else 1112 const char *default_module_name = "/proc/self/exe"; 1113 uptr module_name_len = internal_readlink( 1114 default_module_name, buf, buf_len); 1115 int readlink_error; 1116 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1117 #endif // SANITIZER_SOLARIS 1118 if (IsErr) { 1119 // We can't read binary name for some reason, assume it's unknown. 1120 Report("WARNING: reading executable name failed with errno %d, " 1121 "some stack frames may not be symbolized\n", readlink_error); 1122 module_name_len = internal_snprintf(buf, buf_len, "%s", 1123 default_module_name); 1124 CHECK_LT(module_name_len, buf_len); 1125 } 1126 return module_name_len; 1127 #endif 1128 } 1129 #endif // !SANITIZER_OPENBSD 1130 1131 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1132 #if SANITIZER_LINUX 1133 char *tmpbuf; 1134 uptr tmpsize; 1135 uptr tmplen; 1136 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1137 1024 * 1024)) { 1138 internal_strncpy(buf, tmpbuf, buf_len); 1139 UnmapOrDie(tmpbuf, tmpsize); 1140 return internal_strlen(buf); 1141 } 1142 #endif 1143 return ReadBinaryName(buf, buf_len); 1144 } 1145 1146 // Match full names of the form /path/to/base_name{-,.}* 1147 bool LibraryNameIs(const char *full_name, const char *base_name) { 1148 const char *name = full_name; 1149 // Strip path. 1150 while (*name != '\0') name++; 1151 while (name > full_name && *name != '/') name--; 1152 if (*name == '/') name++; 1153 uptr base_name_length = internal_strlen(base_name); 1154 if (internal_strncmp(name, base_name, base_name_length)) return false; 1155 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1156 } 1157 1158 #if !SANITIZER_ANDROID 1159 // Call cb for each region mapped by map. 1160 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1161 CHECK_NE(map, nullptr); 1162 #if !SANITIZER_FREEBSD && !SANITIZER_OPENBSD 1163 typedef ElfW(Phdr) Elf_Phdr; 1164 typedef ElfW(Ehdr) Elf_Ehdr; 1165 #endif // !SANITIZER_FREEBSD && !SANITIZER_OPENBSD 1166 char *base = (char *)map->l_addr; 1167 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1168 char *phdrs = base + ehdr->e_phoff; 1169 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1170 1171 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1172 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1173 // objects have a non-zero base. 1174 uptr preferred_base = (uptr)-1; 1175 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1176 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1177 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1178 preferred_base = (uptr)phdr->p_vaddr; 1179 } 1180 1181 // Compute the delta from the real base to get a relocation delta. 1182 sptr delta = (uptr)base - preferred_base; 1183 // Now we can figure out what the loader really mapped. 1184 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1185 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1186 if (phdr->p_type == PT_LOAD) { 1187 uptr seg_start = phdr->p_vaddr + delta; 1188 uptr seg_end = seg_start + phdr->p_memsz; 1189 // None of these values are aligned. We consider the ragged edges of the 1190 // load command as defined, since they are mapped from the file. 1191 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1192 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1193 cb((void *)seg_start, seg_end - seg_start); 1194 } 1195 } 1196 } 1197 #endif 1198 1199 #if defined(__x86_64__) && SANITIZER_LINUX 1200 // We cannot use glibc's clone wrapper, because it messes with the child 1201 // task's TLS. It writes the PID and TID of the child task to its thread 1202 // descriptor, but in our case the child task shares the thread descriptor with 1203 // the parent (because we don't know how to allocate a new thread 1204 // descriptor to keep glibc happy). So the stock version of clone(), when 1205 // used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1206 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1207 int *parent_tidptr, void *newtls, int *child_tidptr) { 1208 long long res; 1209 if (!fn || !child_stack) 1210 return -EINVAL; 1211 CHECK_EQ(0, (uptr)child_stack % 16); 1212 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1213 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1214 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1215 register void *r8 __asm__("r8") = newtls; 1216 register int *r10 __asm__("r10") = child_tidptr; 1217 __asm__ __volatile__( 1218 /* %rax = syscall(%rax = SYSCALL(clone), 1219 * %rdi = flags, 1220 * %rsi = child_stack, 1221 * %rdx = parent_tidptr, 1222 * %r8 = new_tls, 1223 * %r10 = child_tidptr) 1224 */ 1225 "syscall\n" 1226 1227 /* if (%rax != 0) 1228 * return; 1229 */ 1230 "testq %%rax,%%rax\n" 1231 "jnz 1f\n" 1232 1233 /* In the child. Terminate unwind chain. */ 1234 // XXX: We should also terminate the CFI unwind chain 1235 // here. Unfortunately clang 3.2 doesn't support the 1236 // necessary CFI directives, so we skip that part. 1237 "xorq %%rbp,%%rbp\n" 1238 1239 /* Call "fn(arg)". */ 1240 "popq %%rax\n" 1241 "popq %%rdi\n" 1242 "call *%%rax\n" 1243 1244 /* Call _exit(%rax). */ 1245 "movq %%rax,%%rdi\n" 1246 "movq %2,%%rax\n" 1247 "syscall\n" 1248 1249 /* Return to parent. */ 1250 "1:\n" 1251 : "=a" (res) 1252 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1253 "S"(child_stack), 1254 "D"(flags), 1255 "d"(parent_tidptr), 1256 "r"(r8), 1257 "r"(r10) 1258 : "memory", "r11", "rcx"); 1259 return res; 1260 } 1261 #elif defined(__mips__) 1262 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1263 int *parent_tidptr, void *newtls, int *child_tidptr) { 1264 long long res; 1265 if (!fn || !child_stack) 1266 return -EINVAL; 1267 CHECK_EQ(0, (uptr)child_stack % 16); 1268 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1269 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1270 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1271 register void *a3 __asm__("$7") = newtls; 1272 register int *a4 __asm__("$8") = child_tidptr; 1273 // We don't have proper CFI directives here because it requires alot of code 1274 // for very marginal benefits. 1275 __asm__ __volatile__( 1276 /* $v0 = syscall($v0 = __NR_clone, 1277 * $a0 = flags, 1278 * $a1 = child_stack, 1279 * $a2 = parent_tidptr, 1280 * $a3 = new_tls, 1281 * $a4 = child_tidptr) 1282 */ 1283 ".cprestore 16;\n" 1284 "move $4,%1;\n" 1285 "move $5,%2;\n" 1286 "move $6,%3;\n" 1287 "move $7,%4;\n" 1288 /* Store the fifth argument on stack 1289 * if we are using 32-bit abi. 1290 */ 1291 #if SANITIZER_WORDSIZE == 32 1292 "lw %5,16($29);\n" 1293 #else 1294 "move $8,%5;\n" 1295 #endif 1296 "li $2,%6;\n" 1297 "syscall;\n" 1298 1299 /* if ($v0 != 0) 1300 * return; 1301 */ 1302 "bnez $2,1f;\n" 1303 1304 /* Call "fn(arg)". */ 1305 #if SANITIZER_WORDSIZE == 32 1306 #ifdef __BIG_ENDIAN__ 1307 "lw $25,4($29);\n" 1308 "lw $4,12($29);\n" 1309 #else 1310 "lw $25,0($29);\n" 1311 "lw $4,8($29);\n" 1312 #endif 1313 #else 1314 "ld $25,0($29);\n" 1315 "ld $4,8($29);\n" 1316 #endif 1317 "jal $25;\n" 1318 1319 /* Call _exit($v0). */ 1320 "move $4,$2;\n" 1321 "li $2,%7;\n" 1322 "syscall;\n" 1323 1324 /* Return to parent. */ 1325 "1:\n" 1326 : "=r" (res) 1327 : "r"(flags), 1328 "r"(child_stack), 1329 "r"(parent_tidptr), 1330 "r"(a3), 1331 "r"(a4), 1332 "i"(__NR_clone), 1333 "i"(__NR_exit) 1334 : "memory", "$29" ); 1335 return res; 1336 } 1337 #elif defined(__aarch64__) 1338 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1339 int *parent_tidptr, void *newtls, int *child_tidptr) { 1340 long long res; 1341 if (!fn || !child_stack) 1342 return -EINVAL; 1343 CHECK_EQ(0, (uptr)child_stack % 16); 1344 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1345 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1346 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1347 1348 register int (*__fn)(void *) __asm__("x0") = fn; 1349 register void *__stack __asm__("x1") = child_stack; 1350 register int __flags __asm__("x2") = flags; 1351 register void *__arg __asm__("x3") = arg; 1352 register int *__ptid __asm__("x4") = parent_tidptr; 1353 register void *__tls __asm__("x5") = newtls; 1354 register int *__ctid __asm__("x6") = child_tidptr; 1355 1356 __asm__ __volatile__( 1357 "mov x0,x2\n" /* flags */ 1358 "mov x2,x4\n" /* ptid */ 1359 "mov x3,x5\n" /* tls */ 1360 "mov x4,x6\n" /* ctid */ 1361 "mov x8,%9\n" /* clone */ 1362 1363 "svc 0x0\n" 1364 1365 /* if (%r0 != 0) 1366 * return %r0; 1367 */ 1368 "cmp x0, #0\n" 1369 "bne 1f\n" 1370 1371 /* In the child, now. Call "fn(arg)". */ 1372 "ldp x1, x0, [sp], #16\n" 1373 "blr x1\n" 1374 1375 /* Call _exit(%r0). */ 1376 "mov x8, %10\n" 1377 "svc 0x0\n" 1378 "1:\n" 1379 1380 : "=r" (res) 1381 : "i"(-EINVAL), 1382 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1383 "r"(__ptid), "r"(__tls), "r"(__ctid), 1384 "i"(__NR_clone), "i"(__NR_exit) 1385 : "x30", "memory"); 1386 return res; 1387 } 1388 #elif defined(__powerpc64__) 1389 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1390 int *parent_tidptr, void *newtls, int *child_tidptr) { 1391 long long res; 1392 // Stack frame structure. 1393 #if SANITIZER_PPC64V1 1394 // Back chain == 0 (SP + 112) 1395 // Frame (112 bytes): 1396 // Parameter save area (SP + 48), 8 doublewords 1397 // TOC save area (SP + 40) 1398 // Link editor doubleword (SP + 32) 1399 // Compiler doubleword (SP + 24) 1400 // LR save area (SP + 16) 1401 // CR save area (SP + 8) 1402 // Back chain (SP + 0) 1403 # define FRAME_SIZE 112 1404 # define FRAME_TOC_SAVE_OFFSET 40 1405 #elif SANITIZER_PPC64V2 1406 // Back chain == 0 (SP + 32) 1407 // Frame (32 bytes): 1408 // TOC save area (SP + 24) 1409 // LR save area (SP + 16) 1410 // CR save area (SP + 8) 1411 // Back chain (SP + 0) 1412 # define FRAME_SIZE 32 1413 # define FRAME_TOC_SAVE_OFFSET 24 1414 #else 1415 # error "Unsupported PPC64 ABI" 1416 #endif 1417 if (!fn || !child_stack) 1418 return -EINVAL; 1419 CHECK_EQ(0, (uptr)child_stack % 16); 1420 1421 register int (*__fn)(void *) __asm__("r3") = fn; 1422 register void *__cstack __asm__("r4") = child_stack; 1423 register int __flags __asm__("r5") = flags; 1424 register void *__arg __asm__("r6") = arg; 1425 register int *__ptidptr __asm__("r7") = parent_tidptr; 1426 register void *__newtls __asm__("r8") = newtls; 1427 register int *__ctidptr __asm__("r9") = child_tidptr; 1428 1429 __asm__ __volatile__( 1430 /* fn and arg are saved across the syscall */ 1431 "mr 28, %5\n\t" 1432 "mr 27, %8\n\t" 1433 1434 /* syscall 1435 r0 == __NR_clone 1436 r3 == flags 1437 r4 == child_stack 1438 r5 == parent_tidptr 1439 r6 == newtls 1440 r7 == child_tidptr */ 1441 "mr 3, %7\n\t" 1442 "mr 5, %9\n\t" 1443 "mr 6, %10\n\t" 1444 "mr 7, %11\n\t" 1445 "li 0, %3\n\t" 1446 "sc\n\t" 1447 1448 /* Test if syscall was successful */ 1449 "cmpdi cr1, 3, 0\n\t" 1450 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1451 "bne- cr1, 1f\n\t" 1452 1453 /* Set up stack frame */ 1454 "li 29, 0\n\t" 1455 "stdu 29, -8(1)\n\t" 1456 "stdu 1, -%12(1)\n\t" 1457 /* Do the function call */ 1458 "std 2, %13(1)\n\t" 1459 #if SANITIZER_PPC64V1 1460 "ld 0, 0(28)\n\t" 1461 "ld 2, 8(28)\n\t" 1462 "mtctr 0\n\t" 1463 #elif SANITIZER_PPC64V2 1464 "mr 12, 28\n\t" 1465 "mtctr 12\n\t" 1466 #else 1467 # error "Unsupported PPC64 ABI" 1468 #endif 1469 "mr 3, 27\n\t" 1470 "bctrl\n\t" 1471 "ld 2, %13(1)\n\t" 1472 1473 /* Call _exit(r3) */ 1474 "li 0, %4\n\t" 1475 "sc\n\t" 1476 1477 /* Return to parent */ 1478 "1:\n\t" 1479 "mr %0, 3\n\t" 1480 : "=r" (res) 1481 : "0" (-1), 1482 "i" (EINVAL), 1483 "i" (__NR_clone), 1484 "i" (__NR_exit), 1485 "r" (__fn), 1486 "r" (__cstack), 1487 "r" (__flags), 1488 "r" (__arg), 1489 "r" (__ptidptr), 1490 "r" (__newtls), 1491 "r" (__ctidptr), 1492 "i" (FRAME_SIZE), 1493 "i" (FRAME_TOC_SAVE_OFFSET) 1494 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1495 return res; 1496 } 1497 #elif defined(__i386__) && SANITIZER_LINUX 1498 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1499 int *parent_tidptr, void *newtls, int *child_tidptr) { 1500 int res; 1501 if (!fn || !child_stack) 1502 return -EINVAL; 1503 CHECK_EQ(0, (uptr)child_stack % 16); 1504 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1505 ((unsigned int *)child_stack)[0] = (uptr)flags; 1506 ((unsigned int *)child_stack)[1] = (uptr)0; 1507 ((unsigned int *)child_stack)[2] = (uptr)fn; 1508 ((unsigned int *)child_stack)[3] = (uptr)arg; 1509 __asm__ __volatile__( 1510 /* %eax = syscall(%eax = SYSCALL(clone), 1511 * %ebx = flags, 1512 * %ecx = child_stack, 1513 * %edx = parent_tidptr, 1514 * %esi = new_tls, 1515 * %edi = child_tidptr) 1516 */ 1517 1518 /* Obtain flags */ 1519 "movl (%%ecx), %%ebx\n" 1520 /* Do the system call */ 1521 "pushl %%ebx\n" 1522 "pushl %%esi\n" 1523 "pushl %%edi\n" 1524 /* Remember the flag value. */ 1525 "movl %%ebx, (%%ecx)\n" 1526 "int $0x80\n" 1527 "popl %%edi\n" 1528 "popl %%esi\n" 1529 "popl %%ebx\n" 1530 1531 /* if (%eax != 0) 1532 * return; 1533 */ 1534 1535 "test %%eax,%%eax\n" 1536 "jnz 1f\n" 1537 1538 /* terminate the stack frame */ 1539 "xorl %%ebp,%%ebp\n" 1540 /* Call FN. */ 1541 "call *%%ebx\n" 1542 #ifdef PIC 1543 "call here\n" 1544 "here:\n" 1545 "popl %%ebx\n" 1546 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1547 #endif 1548 /* Call exit */ 1549 "movl %%eax, %%ebx\n" 1550 "movl %2, %%eax\n" 1551 "int $0x80\n" 1552 "1:\n" 1553 : "=a" (res) 1554 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1555 "c"(child_stack), 1556 "d"(parent_tidptr), 1557 "S"(newtls), 1558 "D"(child_tidptr) 1559 : "memory"); 1560 return res; 1561 } 1562 #elif defined(__arm__) && SANITIZER_LINUX 1563 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1564 int *parent_tidptr, void *newtls, int *child_tidptr) { 1565 unsigned int res; 1566 if (!fn || !child_stack) 1567 return -EINVAL; 1568 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1569 ((unsigned int *)child_stack)[0] = (uptr)fn; 1570 ((unsigned int *)child_stack)[1] = (uptr)arg; 1571 register int r0 __asm__("r0") = flags; 1572 register void *r1 __asm__("r1") = child_stack; 1573 register int *r2 __asm__("r2") = parent_tidptr; 1574 register void *r3 __asm__("r3") = newtls; 1575 register int *r4 __asm__("r4") = child_tidptr; 1576 register int r7 __asm__("r7") = __NR_clone; 1577 1578 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) 1579 # define ARCH_HAS_BX 1580 #endif 1581 #if __ARM_ARCH > 4 1582 # define ARCH_HAS_BLX 1583 #endif 1584 1585 #ifdef ARCH_HAS_BX 1586 # ifdef ARCH_HAS_BLX 1587 # define BLX(R) "blx " #R "\n" 1588 # else 1589 # define BLX(R) "mov lr, pc; bx " #R "\n" 1590 # endif 1591 #else 1592 # define BLX(R) "mov lr, pc; mov pc," #R "\n" 1593 #endif 1594 1595 __asm__ __volatile__( 1596 /* %r0 = syscall(%r7 = SYSCALL(clone), 1597 * %r0 = flags, 1598 * %r1 = child_stack, 1599 * %r2 = parent_tidptr, 1600 * %r3 = new_tls, 1601 * %r4 = child_tidptr) 1602 */ 1603 1604 /* Do the system call */ 1605 "swi 0x0\n" 1606 1607 /* if (%r0 != 0) 1608 * return %r0; 1609 */ 1610 "cmp r0, #0\n" 1611 "bne 1f\n" 1612 1613 /* In the child, now. Call "fn(arg)". */ 1614 "ldr r0, [sp, #4]\n" 1615 "ldr ip, [sp], #8\n" 1616 BLX(ip) 1617 /* Call _exit(%r0). */ 1618 "mov r7, %7\n" 1619 "swi 0x0\n" 1620 "1:\n" 1621 "mov %0, r0\n" 1622 : "=r"(res) 1623 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), 1624 "i"(__NR_exit) 1625 : "memory"); 1626 return res; 1627 } 1628 #endif // defined(__x86_64__) && SANITIZER_LINUX 1629 1630 #if SANITIZER_ANDROID 1631 #if __ANDROID_API__ < 21 1632 extern "C" __attribute__((weak)) int dl_iterate_phdr( 1633 int (*)(struct dl_phdr_info *, size_t, void *), void *); 1634 #endif 1635 1636 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, 1637 void *data) { 1638 // Any name starting with "lib" indicates a bug in L where library base names 1639 // are returned instead of paths. 1640 if (info->dlpi_name && info->dlpi_name[0] == 'l' && 1641 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { 1642 *(bool *)data = true; 1643 return 1; 1644 } 1645 return 0; 1646 } 1647 1648 static atomic_uint32_t android_api_level; 1649 1650 static AndroidApiLevel AndroidDetectApiLevelStatic() { 1651 #if __ANDROID_API__ <= 19 1652 return ANDROID_KITKAT; 1653 #elif __ANDROID_API__ <= 22 1654 return ANDROID_LOLLIPOP_MR1; 1655 #else 1656 return ANDROID_POST_LOLLIPOP; 1657 #endif 1658 } 1659 1660 static AndroidApiLevel AndroidDetectApiLevel() { 1661 if (!&dl_iterate_phdr) 1662 return ANDROID_KITKAT; // K or lower 1663 bool base_name_seen = false; 1664 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); 1665 if (base_name_seen) 1666 return ANDROID_LOLLIPOP_MR1; // L MR1 1667 return ANDROID_POST_LOLLIPOP; // post-L 1668 // Plain L (API level 21) is completely broken wrt ASan and not very 1669 // interesting to detect. 1670 } 1671 1672 extern "C" __attribute__((weak)) void* _DYNAMIC; 1673 1674 AndroidApiLevel AndroidGetApiLevel() { 1675 AndroidApiLevel level = 1676 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); 1677 if (level) return level; 1678 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic() 1679 : AndroidDetectApiLevel(); 1680 atomic_store(&android_api_level, level, memory_order_relaxed); 1681 return level; 1682 } 1683 1684 #endif 1685 1686 static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1687 switch (signum) { 1688 case SIGABRT: 1689 return common_flags()->handle_abort; 1690 case SIGILL: 1691 return common_flags()->handle_sigill; 1692 case SIGTRAP: 1693 return common_flags()->handle_sigtrap; 1694 case SIGFPE: 1695 return common_flags()->handle_sigfpe; 1696 case SIGSEGV: 1697 return common_flags()->handle_segv; 1698 case SIGBUS: 1699 return common_flags()->handle_sigbus; 1700 } 1701 return kHandleSignalNo; 1702 } 1703 1704 HandleSignalMode GetHandleSignalMode(int signum) { 1705 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1706 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1707 return kHandleSignalExclusive; 1708 return result; 1709 } 1710 1711 #if !SANITIZER_GO 1712 void *internal_start_thread(void *(*func)(void *arg), void *arg) { 1713 // Start the thread with signals blocked, otherwise it can steal user signals. 1714 __sanitizer_sigset_t set, old; 1715 internal_sigfillset(&set); 1716 #if SANITIZER_LINUX && !SANITIZER_ANDROID 1717 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 1718 // on any thread, setuid call hangs (see test/tsan/setuid.c). 1719 internal_sigdelset(&set, 33); 1720 #endif 1721 internal_sigprocmask(SIG_SETMASK, &set, &old); 1722 void *th; 1723 real_pthread_create(&th, nullptr, func, arg); 1724 internal_sigprocmask(SIG_SETMASK, &old, nullptr); 1725 return th; 1726 } 1727 1728 void internal_join_thread(void *th) { 1729 real_pthread_join(th, nullptr); 1730 } 1731 #else 1732 void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; } 1733 1734 void internal_join_thread(void *th) {} 1735 #endif 1736 1737 #if defined(__aarch64__) 1738 // Android headers in the older NDK releases miss this definition. 1739 struct __sanitizer_esr_context { 1740 struct _aarch64_ctx head; 1741 uint64_t esr; 1742 }; 1743 1744 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1745 static const u32 kEsrMagic = 0x45535201; 1746 u8 *aux = ucontext->uc_mcontext.__reserved; 1747 while (true) { 1748 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1749 if (ctx->size == 0) break; 1750 if (ctx->magic == kEsrMagic) { 1751 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1752 return true; 1753 } 1754 aux += ctx->size; 1755 } 1756 return false; 1757 } 1758 #endif 1759 1760 #if SANITIZER_OPENBSD 1761 using Context = sigcontext; 1762 #else 1763 using Context = ucontext_t; 1764 #endif 1765 1766 SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1767 Context *ucontext = (Context *)context; 1768 #if defined(__x86_64__) || defined(__i386__) 1769 static const uptr PF_WRITE = 1U << 1; 1770 #if SANITIZER_FREEBSD 1771 uptr err = ucontext->uc_mcontext.mc_err; 1772 #elif SANITIZER_NETBSD 1773 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1774 #elif SANITIZER_OPENBSD 1775 uptr err = ucontext->sc_err; 1776 #elif SANITIZER_SOLARIS && defined(__i386__) 1777 const int Err = 13; 1778 uptr err = ucontext->uc_mcontext.gregs[Err]; 1779 #else 1780 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1781 #endif // SANITIZER_FREEBSD 1782 return err & PF_WRITE ? WRITE : READ; 1783 #elif defined(__mips__) 1784 uint32_t *exception_source; 1785 uint32_t faulty_instruction; 1786 uint32_t op_code; 1787 1788 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 1789 faulty_instruction = (uint32_t)(*exception_source); 1790 1791 op_code = (faulty_instruction >> 26) & 0x3f; 1792 1793 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 1794 switch (op_code) { 1795 case 0x28: // sb 1796 case 0x29: // sh 1797 case 0x2b: // sw 1798 case 0x3f: // sd 1799 #if __mips_isa_rev < 6 1800 case 0x2c: // sdl 1801 case 0x2d: // sdr 1802 case 0x2a: // swl 1803 case 0x2e: // swr 1804 #endif 1805 return SignalContext::WRITE; 1806 1807 case 0x20: // lb 1808 case 0x24: // lbu 1809 case 0x21: // lh 1810 case 0x25: // lhu 1811 case 0x23: // lw 1812 case 0x27: // lwu 1813 case 0x37: // ld 1814 #if __mips_isa_rev < 6 1815 case 0x1a: // ldl 1816 case 0x1b: // ldr 1817 case 0x22: // lwl 1818 case 0x26: // lwr 1819 #endif 1820 return SignalContext::READ; 1821 #if __mips_isa_rev == 6 1822 case 0x3b: // pcrel 1823 op_code = (faulty_instruction >> 19) & 0x3; 1824 switch (op_code) { 1825 case 0x1: // lwpc 1826 case 0x2: // lwupc 1827 return SignalContext::READ; 1828 } 1829 #endif 1830 } 1831 return SignalContext::UNKNOWN; 1832 #elif defined(__arm__) 1833 static const uptr FSR_WRITE = 1U << 11; 1834 uptr fsr = ucontext->uc_mcontext.error_code; 1835 return fsr & FSR_WRITE ? WRITE : READ; 1836 #elif defined(__aarch64__) 1837 static const u64 ESR_ELx_WNR = 1U << 6; 1838 u64 esr; 1839 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN; 1840 return esr & ESR_ELx_WNR ? WRITE : READ; 1841 #elif defined(__sparc__) 1842 // Decode the instruction to determine the access type. 1843 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 1844 #if SANITIZER_SOLARIS 1845 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 1846 #else 1847 // Historical BSDism here. 1848 struct sigcontext *scontext = (struct sigcontext *)context; 1849 #if defined(__arch64__) 1850 uptr pc = scontext->sigc_regs.tpc; 1851 #else 1852 uptr pc = scontext->si_regs.pc; 1853 #endif 1854 #endif 1855 u32 instr = *(u32 *)pc; 1856 return (instr >> 21) & 1 ? WRITE: READ; 1857 #else 1858 (void)ucontext; 1859 return UNKNOWN; // FIXME: Implement. 1860 #endif 1861 } 1862 1863 bool SignalContext::IsTrueFaultingAddress() const { 1864 auto si = static_cast<const siginfo_t *>(siginfo); 1865 // SIGSEGV signals without a true fault address have si_code set to 128. 1866 return si->si_signo == SIGSEGV && si->si_code != 128; 1867 } 1868 1869 void SignalContext::DumpAllRegisters(void *context) { 1870 // FIXME: Implement this. 1871 } 1872 1873 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 1874 #if SANITIZER_NETBSD 1875 // This covers all NetBSD architectures 1876 ucontext_t *ucontext = (ucontext_t *)context; 1877 *pc = _UC_MACHINE_PC(ucontext); 1878 *bp = _UC_MACHINE_FP(ucontext); 1879 *sp = _UC_MACHINE_SP(ucontext); 1880 #elif defined(__arm__) 1881 ucontext_t *ucontext = (ucontext_t*)context; 1882 *pc = ucontext->uc_mcontext.arm_pc; 1883 *bp = ucontext->uc_mcontext.arm_fp; 1884 *sp = ucontext->uc_mcontext.arm_sp; 1885 #elif defined(__aarch64__) 1886 ucontext_t *ucontext = (ucontext_t*)context; 1887 *pc = ucontext->uc_mcontext.pc; 1888 *bp = ucontext->uc_mcontext.regs[29]; 1889 *sp = ucontext->uc_mcontext.sp; 1890 #elif defined(__hppa__) 1891 ucontext_t *ucontext = (ucontext_t*)context; 1892 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 1893 /* GCC uses %r3 whenever a frame pointer is needed. */ 1894 *bp = ucontext->uc_mcontext.sc_gr[3]; 1895 *sp = ucontext->uc_mcontext.sc_gr[30]; 1896 #elif defined(__x86_64__) 1897 # if SANITIZER_FREEBSD 1898 ucontext_t *ucontext = (ucontext_t*)context; 1899 *pc = ucontext->uc_mcontext.mc_rip; 1900 *bp = ucontext->uc_mcontext.mc_rbp; 1901 *sp = ucontext->uc_mcontext.mc_rsp; 1902 #elif SANITIZER_OPENBSD 1903 sigcontext *ucontext = (sigcontext *)context; 1904 *pc = ucontext->sc_rip; 1905 *bp = ucontext->sc_rbp; 1906 *sp = ucontext->sc_rsp; 1907 # else 1908 ucontext_t *ucontext = (ucontext_t*)context; 1909 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 1910 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 1911 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 1912 # endif 1913 #elif defined(__i386__) 1914 # if SANITIZER_FREEBSD 1915 ucontext_t *ucontext = (ucontext_t*)context; 1916 *pc = ucontext->uc_mcontext.mc_eip; 1917 *bp = ucontext->uc_mcontext.mc_ebp; 1918 *sp = ucontext->uc_mcontext.mc_esp; 1919 #elif SANITIZER_OPENBSD 1920 sigcontext *ucontext = (sigcontext *)context; 1921 *pc = ucontext->sc_eip; 1922 *bp = ucontext->sc_ebp; 1923 *sp = ucontext->sc_esp; 1924 # else 1925 ucontext_t *ucontext = (ucontext_t*)context; 1926 # if SANITIZER_SOLARIS 1927 /* Use the numeric values: the symbolic ones are undefined by llvm 1928 include/llvm/Support/Solaris.h. */ 1929 # ifndef REG_EIP 1930 # define REG_EIP 14 // REG_PC 1931 # endif 1932 # ifndef REG_EBP 1933 # define REG_EBP 6 // REG_FP 1934 # endif 1935 # ifndef REG_ESP 1936 # define REG_ESP 17 // REG_SP 1937 # endif 1938 # endif 1939 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 1940 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 1941 *sp = ucontext->uc_mcontext.gregs[REG_ESP]; 1942 # endif 1943 #elif defined(__powerpc__) || defined(__powerpc64__) 1944 ucontext_t *ucontext = (ucontext_t*)context; 1945 *pc = ucontext->uc_mcontext.regs->nip; 1946 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 1947 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 1948 // pointer, but GCC always uses r31 when we need a frame pointer. 1949 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 1950 #elif defined(__sparc__) 1951 #if defined(__arch64__) || defined(__sparcv9) 1952 #define STACK_BIAS 2047 1953 #else 1954 #define STACK_BIAS 0 1955 # endif 1956 # if SANITIZER_SOLARIS 1957 ucontext_t *ucontext = (ucontext_t *)context; 1958 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 1959 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS; 1960 #else 1961 // Historical BSDism here. 1962 struct sigcontext *scontext = (struct sigcontext *)context; 1963 #if defined(__arch64__) 1964 *pc = scontext->sigc_regs.tpc; 1965 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS; 1966 #else 1967 *pc = scontext->si_regs.pc; 1968 *sp = scontext->si_regs.u_regs[14]; 1969 #endif 1970 # endif 1971 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS; 1972 #elif defined(__mips__) 1973 ucontext_t *ucontext = (ucontext_t*)context; 1974 *pc = ucontext->uc_mcontext.pc; 1975 *bp = ucontext->uc_mcontext.gregs[30]; 1976 *sp = ucontext->uc_mcontext.gregs[29]; 1977 #elif defined(__s390__) 1978 ucontext_t *ucontext = (ucontext_t*)context; 1979 # if defined(__s390x__) 1980 *pc = ucontext->uc_mcontext.psw.addr; 1981 # else 1982 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 1983 # endif 1984 *bp = ucontext->uc_mcontext.gregs[11]; 1985 *sp = ucontext->uc_mcontext.gregs[15]; 1986 #elif defined(__riscv) 1987 ucontext_t *ucontext = (ucontext_t*)context; 1988 *pc = ucontext->uc_mcontext.__gregs[REG_PC]; 1989 *bp = ucontext->uc_mcontext.__gregs[REG_S0]; 1990 *sp = ucontext->uc_mcontext.__gregs[REG_SP]; 1991 #else 1992 # error "Unsupported arch" 1993 #endif 1994 } 1995 1996 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 1997 1998 void InitializePlatformEarly() { 1999 // Do nothing. 2000 } 2001 2002 void MaybeReexec() { 2003 // No need to re-exec on Linux. 2004 } 2005 2006 void CheckASLR() { 2007 #if SANITIZER_NETBSD 2008 int mib[3]; 2009 int paxflags; 2010 uptr len = sizeof(paxflags); 2011 2012 mib[0] = CTL_PROC; 2013 mib[1] = internal_getpid(); 2014 mib[2] = PROC_PID_PAXFLAGS; 2015 2016 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2017 Printf("sysctl failed\n"); 2018 Die(); 2019 } 2020 2021 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2022 Printf("This sanitizer is not compatible with enabled ASLR\n"); 2023 Die(); 2024 } 2025 #elif SANITIZER_PPC64V2 2026 // Disable ASLR for Linux PPC64LE. 2027 int old_personality = personality(0xffffffff); 2028 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2029 VReport(1, "WARNING: Program is being run with address space layout " 2030 "randomization (ASLR) enabled which prevents the thread and " 2031 "memory sanitizers from working on powerpc64le.\n" 2032 "ASLR will be disabled and the program re-executed.\n"); 2033 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2034 ReExec(); 2035 } 2036 #elif SANITIZER_FREEBSD 2037 int aslr_pie; 2038 uptr len = sizeof(aslr_pie); 2039 #if SANITIZER_WORDSIZE == 64 2040 if (UNLIKELY(internal_sysctlbyname("kern.elf64.aslr.pie_enable", 2041 &aslr_pie, &len, NULL, 0) == -1)) { 2042 // We're making things less 'dramatic' here since 2043 // the OID is not necessarily guaranteed to be here 2044 // just yet regarding FreeBSD release 2045 return; 2046 } 2047 2048 if (aslr_pie > 0) { 2049 Printf("This sanitizer is not compatible with enabled ASLR " 2050 "and binaries compiled with PIE\n"); 2051 Die(); 2052 } 2053 #endif 2054 // there might be 32 bits compat for 64 bits 2055 if (UNLIKELY(internal_sysctlbyname("kern.elf32.aslr.pie_enable", 2056 &aslr_pie, &len, NULL, 0) == -1)) { 2057 return; 2058 } 2059 2060 if (aslr_pie > 0) { 2061 Printf("This sanitizer is not compatible with enabled ASLR " 2062 "and binaries compiled with PIE\n"); 2063 Die(); 2064 } 2065 #else 2066 // Do nothing 2067 #endif 2068 } 2069 2070 void CheckMPROTECT() { 2071 #if SANITIZER_NETBSD 2072 int mib[3]; 2073 int paxflags; 2074 uptr len = sizeof(paxflags); 2075 2076 mib[0] = CTL_PROC; 2077 mib[1] = internal_getpid(); 2078 mib[2] = PROC_PID_PAXFLAGS; 2079 2080 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2081 Printf("sysctl failed\n"); 2082 Die(); 2083 } 2084 2085 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2086 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2087 Die(); 2088 } 2089 #else 2090 // Do nothing 2091 #endif 2092 } 2093 2094 void PrintModuleMap() { } 2095 2096 void CheckNoDeepBind(const char *filename, int flag) { 2097 #ifdef RTLD_DEEPBIND 2098 if (flag & RTLD_DEEPBIND) { 2099 Report( 2100 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2101 " which is incompatibe with sanitizer runtime " 2102 "(see https://github.com/google/sanitizers/issues/611 for details" 2103 "). If you want to run %s library under sanitizers please remove " 2104 "RTLD_DEEPBIND from dlopen flags.\n", 2105 filename, filename); 2106 Die(); 2107 } 2108 #endif 2109 } 2110 2111 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2112 uptr *largest_gap_found, 2113 uptr *max_occupied_addr) { 2114 UNREACHABLE("FindAvailableMemoryRange is not available"); 2115 return 0; 2116 } 2117 2118 bool GetRandom(void *buffer, uptr length, bool blocking) { 2119 if (!buffer || !length || length > 256) 2120 return false; 2121 #if SANITIZER_USE_GETENTROPY 2122 uptr rnd = getentropy(buffer, length); 2123 int rverrno = 0; 2124 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2125 return false; 2126 else if (rnd == 0) 2127 return true; 2128 #endif // SANITIZER_USE_GETENTROPY 2129 2130 #if SANITIZER_USE_GETRANDOM 2131 static atomic_uint8_t skip_getrandom_syscall; 2132 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2133 // Up to 256 bytes, getrandom will not be interrupted. 2134 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2135 blocking ? 0 : GRND_NONBLOCK); 2136 int rverrno = 0; 2137 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2138 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2139 else if (res == length) 2140 return true; 2141 } 2142 #endif // SANITIZER_USE_GETRANDOM 2143 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2144 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2145 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2146 if (internal_iserror(fd)) 2147 return false; 2148 uptr res = internal_read(fd, buffer, length); 2149 if (internal_iserror(res)) 2150 return false; 2151 internal_close(fd); 2152 return true; 2153 } 2154 2155 } // namespace __sanitizer 2156 2157 #endif 2158