1 //===-- sanitizer_linux.cpp -----------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is shared between AddressSanitizer and ThreadSanitizer 10 // run-time libraries and implements linux-specific functions from 11 // sanitizer_libc.h. 12 //===----------------------------------------------------------------------===// 13 14 #include "sanitizer_platform.h" 15 16 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \ 17 SANITIZER_SOLARIS 18 19 #include "sanitizer_common.h" 20 #include "sanitizer_flags.h" 21 #include "sanitizer_getauxval.h" 22 #include "sanitizer_internal_defs.h" 23 #include "sanitizer_libc.h" 24 #include "sanitizer_linux.h" 25 #include "sanitizer_mutex.h" 26 #include "sanitizer_placement_new.h" 27 #include "sanitizer_procmaps.h" 28 29 #if SANITIZER_LINUX && !SANITIZER_GO 30 #include <asm/param.h> 31 #endif 32 33 // For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat' 34 // format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To 35 // access stat from asm/stat.h, without conflicting with definition in 36 // sys/stat.h, we use this trick. 37 #if SANITIZER_MIPS64 38 #include <asm/unistd.h> 39 #include <sys/types.h> 40 #define stat kernel_stat 41 #if SANITIZER_GO 42 #undef st_atime 43 #undef st_mtime 44 #undef st_ctime 45 #define st_atime st_atim 46 #define st_mtime st_mtim 47 #define st_ctime st_ctim 48 #endif 49 #include <asm/stat.h> 50 #undef stat 51 #endif 52 53 #include <dlfcn.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <link.h> 57 #include <pthread.h> 58 #include <sched.h> 59 #include <signal.h> 60 #include <sys/mman.h> 61 #include <sys/param.h> 62 #if !SANITIZER_SOLARIS 63 #include <sys/ptrace.h> 64 #endif 65 #include <sys/resource.h> 66 #include <sys/stat.h> 67 #include <sys/syscall.h> 68 #include <sys/time.h> 69 #include <sys/types.h> 70 #include <ucontext.h> 71 #include <unistd.h> 72 73 #if SANITIZER_LINUX 74 #include <sys/utsname.h> 75 #endif 76 77 #if SANITIZER_LINUX && !SANITIZER_ANDROID 78 #include <sys/personality.h> 79 #endif 80 81 #if SANITIZER_LINUX && defined(__loongarch__) 82 # include <sys/sysmacros.h> 83 #endif 84 85 #if SANITIZER_FREEBSD 86 #include <sys/exec.h> 87 #include <sys/procctl.h> 88 #include <sys/sysctl.h> 89 #include <machine/atomic.h> 90 extern "C" { 91 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on 92 // FreeBSD 9.2 and 10.0. 93 #include <sys/umtx.h> 94 } 95 #include <sys/thr.h> 96 #endif // SANITIZER_FREEBSD 97 98 #if SANITIZER_NETBSD 99 #include <limits.h> // For NAME_MAX 100 #include <sys/sysctl.h> 101 #include <sys/exec.h> 102 extern struct ps_strings *__ps_strings; 103 #endif // SANITIZER_NETBSD 104 105 #if SANITIZER_SOLARIS 106 #include <stdlib.h> 107 #include <thread.h> 108 #define environ _environ 109 #endif 110 111 extern char **environ; 112 113 #if SANITIZER_LINUX 114 // <linux/time.h> 115 struct kernel_timeval { 116 long tv_sec; 117 long tv_usec; 118 }; 119 120 // <linux/futex.h> is broken on some linux distributions. 121 const int FUTEX_WAIT = 0; 122 const int FUTEX_WAKE = 1; 123 const int FUTEX_PRIVATE_FLAG = 128; 124 const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; 125 const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; 126 #endif // SANITIZER_LINUX 127 128 // Are we using 32-bit or 64-bit Linux syscalls? 129 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 130 // but it still needs to use 64-bit syscalls. 131 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \ 132 SANITIZER_WORDSIZE == 64 || \ 133 (defined(__mips__) && _MIPS_SIM == _ABIN32)) 134 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 135 #else 136 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 137 #endif 138 139 // Note : FreeBSD had implemented both 140 // Linux apis, available from 141 // future 12.x version most likely 142 #if SANITIZER_LINUX && defined(__NR_getrandom) 143 # if !defined(GRND_NONBLOCK) 144 # define GRND_NONBLOCK 1 145 # endif 146 # define SANITIZER_USE_GETRANDOM 1 147 #else 148 # define SANITIZER_USE_GETRANDOM 0 149 #endif // SANITIZER_LINUX && defined(__NR_getrandom) 150 151 #if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000 152 # define SANITIZER_USE_GETENTROPY 1 153 #else 154 # define SANITIZER_USE_GETENTROPY 0 155 #endif 156 157 namespace __sanitizer { 158 159 void SetSigProcMask(__sanitizer_sigset_t *set, __sanitizer_sigset_t *oldset) { 160 CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, set, oldset)); 161 } 162 163 void BlockSignals(__sanitizer_sigset_t *oldset) { 164 __sanitizer_sigset_t set; 165 internal_sigfillset(&set); 166 # if SANITIZER_LINUX && !SANITIZER_ANDROID 167 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 168 // on any thread, setuid call hangs. 169 // See test/sanitizer_common/TestCases/Linux/setuid.c. 170 internal_sigdelset(&set, 33); 171 # endif 172 # if SANITIZER_LINUX 173 // Seccomp-BPF-sandboxed processes rely on SIGSYS to handle trapped syscalls. 174 // If this signal is blocked, such calls cannot be handled and the process may 175 // hang. 176 internal_sigdelset(&set, 31); 177 # endif 178 SetSigProcMask(&set, oldset); 179 } 180 181 ScopedBlockSignals::ScopedBlockSignals(__sanitizer_sigset_t *copy) { 182 BlockSignals(&saved_); 183 if (copy) 184 internal_memcpy(copy, &saved_, sizeof(saved_)); 185 } 186 187 ScopedBlockSignals::~ScopedBlockSignals() { SetSigProcMask(&saved_, nullptr); } 188 189 # if SANITIZER_LINUX && defined(__x86_64__) 190 # include "sanitizer_syscall_linux_x86_64.inc" 191 # elif SANITIZER_LINUX && SANITIZER_RISCV64 192 # include "sanitizer_syscall_linux_riscv64.inc" 193 # elif SANITIZER_LINUX && defined(__aarch64__) 194 # include "sanitizer_syscall_linux_aarch64.inc" 195 # elif SANITIZER_LINUX && defined(__arm__) 196 # include "sanitizer_syscall_linux_arm.inc" 197 # elif SANITIZER_LINUX && defined(__hexagon__) 198 # include "sanitizer_syscall_linux_hexagon.inc" 199 # elif SANITIZER_LINUX && SANITIZER_LOONGARCH64 200 # include "sanitizer_syscall_linux_loongarch64.inc" 201 # else 202 # include "sanitizer_syscall_generic.inc" 203 # endif 204 205 // --------------- sanitizer_libc.h 206 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 207 #if !SANITIZER_S390 208 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd, 209 u64 offset) { 210 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 211 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd, 212 offset); 213 #else 214 // mmap2 specifies file offset in 4096-byte units. 215 CHECK(IsAligned(offset, 4096)); 216 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd, 217 offset / 4096); 218 #endif 219 } 220 #endif // !SANITIZER_S390 221 222 uptr internal_munmap(void *addr, uptr length) { 223 return internal_syscall(SYSCALL(munmap), (uptr)addr, length); 224 } 225 226 #if SANITIZER_LINUX 227 uptr internal_mremap(void *old_address, uptr old_size, uptr new_size, int flags, 228 void *new_address) { 229 return internal_syscall(SYSCALL(mremap), (uptr)old_address, old_size, 230 new_size, flags, (uptr)new_address); 231 } 232 #endif 233 234 int internal_mprotect(void *addr, uptr length, int prot) { 235 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot); 236 } 237 238 int internal_madvise(uptr addr, uptr length, int advice) { 239 return internal_syscall(SYSCALL(madvise), addr, length, advice); 240 } 241 242 uptr internal_close(fd_t fd) { 243 return internal_syscall(SYSCALL(close), fd); 244 } 245 246 uptr internal_open(const char *filename, int flags) { 247 # if SANITIZER_LINUX 248 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags); 249 #else 250 return internal_syscall(SYSCALL(open), (uptr)filename, flags); 251 #endif 252 } 253 254 uptr internal_open(const char *filename, int flags, u32 mode) { 255 # if SANITIZER_LINUX 256 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags, 257 mode); 258 #else 259 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode); 260 #endif 261 } 262 263 uptr internal_read(fd_t fd, void *buf, uptr count) { 264 sptr res; 265 HANDLE_EINTR(res, 266 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)); 267 return res; 268 } 269 270 uptr internal_write(fd_t fd, const void *buf, uptr count) { 271 sptr res; 272 HANDLE_EINTR(res, 273 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)); 274 return res; 275 } 276 277 uptr internal_ftruncate(fd_t fd, uptr size) { 278 sptr res; 279 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd, 280 (OFF_T)size)); 281 return res; 282 } 283 284 #if (!SANITIZER_LINUX_USES_64BIT_SYSCALLS || SANITIZER_SPARC) && SANITIZER_LINUX 285 static void stat64_to_stat(struct stat64 *in, struct stat *out) { 286 internal_memset(out, 0, sizeof(*out)); 287 out->st_dev = in->st_dev; 288 out->st_ino = in->st_ino; 289 out->st_mode = in->st_mode; 290 out->st_nlink = in->st_nlink; 291 out->st_uid = in->st_uid; 292 out->st_gid = in->st_gid; 293 out->st_rdev = in->st_rdev; 294 out->st_size = in->st_size; 295 out->st_blksize = in->st_blksize; 296 out->st_blocks = in->st_blocks; 297 out->st_atime = in->st_atime; 298 out->st_mtime = in->st_mtime; 299 out->st_ctime = in->st_ctime; 300 } 301 #endif 302 303 #if SANITIZER_LINUX && defined(__loongarch__) 304 static void statx_to_stat(struct statx *in, struct stat *out) { 305 internal_memset(out, 0, sizeof(*out)); 306 out->st_dev = makedev(in->stx_dev_major, in->stx_dev_minor); 307 out->st_ino = in->stx_ino; 308 out->st_mode = in->stx_mode; 309 out->st_nlink = in->stx_nlink; 310 out->st_uid = in->stx_uid; 311 out->st_gid = in->stx_gid; 312 out->st_rdev = makedev(in->stx_rdev_major, in->stx_rdev_minor); 313 out->st_size = in->stx_size; 314 out->st_blksize = in->stx_blksize; 315 out->st_blocks = in->stx_blocks; 316 out->st_atime = in->stx_atime.tv_sec; 317 out->st_atim.tv_nsec = in->stx_atime.tv_nsec; 318 out->st_mtime = in->stx_mtime.tv_sec; 319 out->st_mtim.tv_nsec = in->stx_mtime.tv_nsec; 320 out->st_ctime = in->stx_ctime.tv_sec; 321 out->st_ctim.tv_nsec = in->stx_ctime.tv_nsec; 322 } 323 #endif 324 325 #if SANITIZER_MIPS64 326 // Undefine compatibility macros from <sys/stat.h> 327 // so that they would not clash with the kernel_stat 328 // st_[a|m|c]time fields 329 #if !SANITIZER_GO 330 #undef st_atime 331 #undef st_mtime 332 #undef st_ctime 333 #endif 334 #if defined(SANITIZER_ANDROID) 335 // Bionic sys/stat.h defines additional macros 336 // for compatibility with the old NDKs and 337 // they clash with the kernel_stat structure 338 // st_[a|m|c]time_nsec fields. 339 #undef st_atime_nsec 340 #undef st_mtime_nsec 341 #undef st_ctime_nsec 342 #endif 343 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) { 344 internal_memset(out, 0, sizeof(*out)); 345 out->st_dev = in->st_dev; 346 out->st_ino = in->st_ino; 347 out->st_mode = in->st_mode; 348 out->st_nlink = in->st_nlink; 349 out->st_uid = in->st_uid; 350 out->st_gid = in->st_gid; 351 out->st_rdev = in->st_rdev; 352 out->st_size = in->st_size; 353 out->st_blksize = in->st_blksize; 354 out->st_blocks = in->st_blocks; 355 #if defined(__USE_MISC) || \ 356 defined(__USE_XOPEN2K8) || \ 357 defined(SANITIZER_ANDROID) 358 out->st_atim.tv_sec = in->st_atime; 359 out->st_atim.tv_nsec = in->st_atime_nsec; 360 out->st_mtim.tv_sec = in->st_mtime; 361 out->st_mtim.tv_nsec = in->st_mtime_nsec; 362 out->st_ctim.tv_sec = in->st_ctime; 363 out->st_ctim.tv_nsec = in->st_ctime_nsec; 364 #else 365 out->st_atime = in->st_atime; 366 out->st_atimensec = in->st_atime_nsec; 367 out->st_mtime = in->st_mtime; 368 out->st_mtimensec = in->st_mtime_nsec; 369 out->st_ctime = in->st_ctime; 370 out->st_atimensec = in->st_ctime_nsec; 371 #endif 372 } 373 #endif 374 375 uptr internal_stat(const char *path, void *buf) { 376 # if SANITIZER_FREEBSD 377 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0); 378 # elif SANITIZER_LINUX 379 # if defined(__loongarch__) 380 struct statx bufx; 381 int res = internal_syscall(SYSCALL(statx), AT_FDCWD, (uptr)path, 382 AT_NO_AUTOMOUNT, STATX_BASIC_STATS, (uptr)&bufx); 383 statx_to_stat(&bufx, (struct stat *)buf); 384 return res; 385 # elif (SANITIZER_WORDSIZE == 64 || SANITIZER_X32 || \ 386 (defined(__mips__) && _MIPS_SIM == _ABIN32)) && \ 387 !SANITIZER_SPARC 388 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 389 0); 390 # else 391 struct stat64 buf64; 392 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 393 (uptr)&buf64, 0); 394 stat64_to_stat(&buf64, (struct stat *)buf); 395 return res; 396 # endif 397 # else 398 struct stat64 buf64; 399 int res = internal_syscall(SYSCALL(stat64), path, &buf64); 400 stat64_to_stat(&buf64, (struct stat *)buf); 401 return res; 402 # endif 403 } 404 405 uptr internal_lstat(const char *path, void *buf) { 406 # if SANITIZER_FREEBSD 407 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 408 AT_SYMLINK_NOFOLLOW); 409 # elif SANITIZER_LINUX 410 # if defined(__loongarch__) 411 struct statx bufx; 412 int res = internal_syscall(SYSCALL(statx), AT_FDCWD, (uptr)path, 413 AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT, 414 STATX_BASIC_STATS, (uptr)&bufx); 415 statx_to_stat(&bufx, (struct stat *)buf); 416 return res; 417 # elif (defined(_LP64) || SANITIZER_X32 || \ 418 (defined(__mips__) && _MIPS_SIM == _ABIN32)) && \ 419 !SANITIZER_SPARC 420 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 421 AT_SYMLINK_NOFOLLOW); 422 # else 423 struct stat64 buf64; 424 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 425 (uptr)&buf64, AT_SYMLINK_NOFOLLOW); 426 stat64_to_stat(&buf64, (struct stat *)buf); 427 return res; 428 # endif 429 # else 430 struct stat64 buf64; 431 int res = internal_syscall(SYSCALL(lstat64), path, &buf64); 432 stat64_to_stat(&buf64, (struct stat *)buf); 433 return res; 434 # endif 435 } 436 437 uptr internal_fstat(fd_t fd, void *buf) { 438 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 439 #if SANITIZER_MIPS64 440 // For mips64, fstat syscall fills buffer in the format of kernel_stat 441 struct kernel_stat kbuf; 442 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf); 443 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 444 return res; 445 # elif SANITIZER_LINUX && defined(__loongarch__) 446 struct statx bufx; 447 int res = internal_syscall(SYSCALL(statx), fd, "", AT_EMPTY_PATH, 448 STATX_BASIC_STATS, (uptr)&bufx); 449 statx_to_stat(&bufx, (struct stat *)buf); 450 return res; 451 # else 452 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf); 453 # endif 454 #else 455 struct stat64 buf64; 456 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64); 457 stat64_to_stat(&buf64, (struct stat *)buf); 458 return res; 459 #endif 460 } 461 462 uptr internal_filesize(fd_t fd) { 463 struct stat st; 464 if (internal_fstat(fd, &st)) 465 return -1; 466 return (uptr)st.st_size; 467 } 468 469 uptr internal_dup(int oldfd) { 470 return internal_syscall(SYSCALL(dup), oldfd); 471 } 472 473 uptr internal_dup2(int oldfd, int newfd) { 474 # if SANITIZER_LINUX 475 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0); 476 #else 477 return internal_syscall(SYSCALL(dup2), oldfd, newfd); 478 #endif 479 } 480 481 uptr internal_readlink(const char *path, char *buf, uptr bufsize) { 482 # if SANITIZER_LINUX 483 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 484 bufsize); 485 #else 486 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize); 487 #endif 488 } 489 490 uptr internal_unlink(const char *path) { 491 # if SANITIZER_LINUX 492 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0); 493 #else 494 return internal_syscall(SYSCALL(unlink), (uptr)path); 495 #endif 496 } 497 498 uptr internal_rename(const char *oldpath, const char *newpath) { 499 # if (defined(__riscv) || defined(__loongarch__)) && defined(__linux__) 500 return internal_syscall(SYSCALL(renameat2), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 501 (uptr)newpath, 0); 502 # elif SANITIZER_LINUX 503 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 504 (uptr)newpath); 505 # else 506 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath); 507 # endif 508 } 509 510 uptr internal_sched_yield() { 511 return internal_syscall(SYSCALL(sched_yield)); 512 } 513 514 void internal_usleep(u64 useconds) { 515 struct timespec ts; 516 ts.tv_sec = useconds / 1000000; 517 ts.tv_nsec = (useconds % 1000000) * 1000; 518 internal_syscall(SYSCALL(nanosleep), &ts, &ts); 519 } 520 521 uptr internal_execve(const char *filename, char *const argv[], 522 char *const envp[]) { 523 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, 524 (uptr)envp); 525 } 526 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 527 528 #if !SANITIZER_NETBSD 529 void internal__exit(int exitcode) { 530 #if SANITIZER_FREEBSD || SANITIZER_SOLARIS 531 internal_syscall(SYSCALL(exit), exitcode); 532 #else 533 internal_syscall(SYSCALL(exit_group), exitcode); 534 #endif 535 Die(); // Unreachable. 536 } 537 #endif // !SANITIZER_NETBSD 538 539 // ----------------- sanitizer_common.h 540 bool FileExists(const char *filename) { 541 if (ShouldMockFailureToOpen(filename)) 542 return false; 543 struct stat st; 544 if (internal_stat(filename, &st)) 545 return false; 546 // Sanity check: filename is a regular file. 547 return S_ISREG(st.st_mode); 548 } 549 550 bool DirExists(const char *path) { 551 struct stat st; 552 if (internal_stat(path, &st)) 553 return false; 554 return S_ISDIR(st.st_mode); 555 } 556 557 # if !SANITIZER_NETBSD 558 tid_t GetTid() { 559 #if SANITIZER_FREEBSD 560 long Tid; 561 thr_self(&Tid); 562 return Tid; 563 #elif SANITIZER_SOLARIS 564 return thr_self(); 565 #else 566 return internal_syscall(SYSCALL(gettid)); 567 #endif 568 } 569 570 int TgKill(pid_t pid, tid_t tid, int sig) { 571 #if SANITIZER_LINUX 572 return internal_syscall(SYSCALL(tgkill), pid, tid, sig); 573 #elif SANITIZER_FREEBSD 574 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig); 575 #elif SANITIZER_SOLARIS 576 (void)pid; 577 return thr_kill(tid, sig); 578 #endif 579 } 580 #endif 581 582 #if SANITIZER_GLIBC 583 u64 NanoTime() { 584 kernel_timeval tv; 585 internal_memset(&tv, 0, sizeof(tv)); 586 internal_syscall(SYSCALL(gettimeofday), &tv, 0); 587 return (u64)tv.tv_sec * 1000 * 1000 * 1000 + tv.tv_usec * 1000; 588 } 589 // Used by real_clock_gettime. 590 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) { 591 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp); 592 } 593 #elif !SANITIZER_SOLARIS && !SANITIZER_NETBSD 594 u64 NanoTime() { 595 struct timespec ts; 596 clock_gettime(CLOCK_REALTIME, &ts); 597 return (u64)ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec; 598 } 599 #endif 600 601 // Like getenv, but reads env directly from /proc (on Linux) or parses the 602 // 'environ' array (on some others) and does not use libc. This function 603 // should be called first inside __asan_init. 604 const char *GetEnv(const char *name) { 605 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_SOLARIS 606 if (::environ != 0) { 607 uptr NameLen = internal_strlen(name); 608 for (char **Env = ::environ; *Env != 0; Env++) { 609 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=') 610 return (*Env) + NameLen + 1; 611 } 612 } 613 return 0; // Not found. 614 #elif SANITIZER_LINUX 615 static char *environ; 616 static uptr len; 617 static bool inited; 618 if (!inited) { 619 inited = true; 620 uptr environ_size; 621 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len)) 622 environ = nullptr; 623 } 624 if (!environ || len == 0) return nullptr; 625 uptr namelen = internal_strlen(name); 626 const char *p = environ; 627 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 628 // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 629 const char* endp = 630 (char*)internal_memchr(p, '\0', len - (p - environ)); 631 if (!endp) // this entry isn't NUL terminated 632 return nullptr; 633 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 634 return p + namelen + 1; // point after = 635 p = endp + 1; 636 } 637 return nullptr; // Not found. 638 #else 639 #error "Unsupported platform" 640 #endif 641 } 642 643 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_GO 644 extern "C" { 645 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 646 } 647 #endif 648 649 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 650 static void ReadNullSepFileToArray(const char *path, char ***arr, 651 int arr_size) { 652 char *buff; 653 uptr buff_size; 654 uptr buff_len; 655 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 656 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 657 (*arr)[0] = nullptr; 658 return; 659 } 660 (*arr)[0] = buff; 661 int count, i; 662 for (count = 1, i = 1; ; i++) { 663 if (buff[i] == 0) { 664 if (buff[i+1] == 0) break; 665 (*arr)[count] = &buff[i+1]; 666 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 667 count++; 668 } 669 } 670 (*arr)[count] = nullptr; 671 } 672 #endif 673 674 static void GetArgsAndEnv(char ***argv, char ***envp) { 675 #if SANITIZER_FREEBSD 676 // On FreeBSD, retrieving the argument and environment arrays is done via the 677 // kern.ps_strings sysctl, which returns a pointer to a structure containing 678 // this information. See also <sys/exec.h>. 679 ps_strings *pss; 680 uptr sz = sizeof(pss); 681 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 682 Printf("sysctl kern.ps_strings failed\n"); 683 Die(); 684 } 685 *argv = pss->ps_argvstr; 686 *envp = pss->ps_envstr; 687 #elif SANITIZER_NETBSD 688 *argv = __ps_strings->ps_argvstr; 689 *envp = __ps_strings->ps_envstr; 690 #else // SANITIZER_FREEBSD 691 #if !SANITIZER_GO 692 if (&__libc_stack_end) { 693 uptr* stack_end = (uptr*)__libc_stack_end; 694 // Normally argc can be obtained from *stack_end, however, on ARM glibc's 695 // _start clobbers it: 696 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/start.S;hb=refs/heads/release/2.31/master#l75 697 // Do not special-case ARM and infer argc from argv everywhere. 698 int argc = 0; 699 while (stack_end[argc + 1]) argc++; 700 *argv = (char**)(stack_end + 1); 701 *envp = (char**)(stack_end + argc + 2); 702 } else { 703 #endif // !SANITIZER_GO 704 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 705 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 706 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 707 #if !SANITIZER_GO 708 } 709 #endif // !SANITIZER_GO 710 #endif // SANITIZER_FREEBSD 711 } 712 713 char **GetArgv() { 714 char **argv, **envp; 715 GetArgsAndEnv(&argv, &envp); 716 return argv; 717 } 718 719 char **GetEnviron() { 720 char **argv, **envp; 721 GetArgsAndEnv(&argv, &envp); 722 return envp; 723 } 724 725 #if !SANITIZER_SOLARIS 726 void FutexWait(atomic_uint32_t *p, u32 cmp) { 727 # if SANITIZER_FREEBSD 728 _umtx_op(p, UMTX_OP_WAIT_UINT, cmp, 0, 0); 729 # elif SANITIZER_NETBSD 730 sched_yield(); /* No userspace futex-like synchronization */ 731 # else 732 internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAIT_PRIVATE, cmp, 0, 0, 0); 733 # endif 734 } 735 736 void FutexWake(atomic_uint32_t *p, u32 count) { 737 # if SANITIZER_FREEBSD 738 _umtx_op(p, UMTX_OP_WAKE, count, 0, 0); 739 # elif SANITIZER_NETBSD 740 /* No userspace futex-like synchronization */ 741 # else 742 internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAKE_PRIVATE, count, 0, 0, 0); 743 # endif 744 } 745 746 # endif // !SANITIZER_SOLARIS 747 748 // ----------------- sanitizer_linux.h 749 // The actual size of this structure is specified by d_reclen. 750 // Note that getdents64 uses a different structure format. We only provide the 751 // 32-bit syscall here. 752 #if SANITIZER_NETBSD 753 // Not used 754 #else 755 struct linux_dirent { 756 # if SANITIZER_X32 || SANITIZER_LINUX 757 u64 d_ino; 758 u64 d_off; 759 # else 760 unsigned long d_ino; 761 unsigned long d_off; 762 # endif 763 unsigned short d_reclen; 764 # if SANITIZER_LINUX 765 unsigned char d_type; 766 # endif 767 char d_name[256]; 768 }; 769 #endif 770 771 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 772 // Syscall wrappers. 773 uptr internal_ptrace(int request, int pid, void *addr, void *data) { 774 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 775 (uptr)data); 776 } 777 778 uptr internal_waitpid(int pid, int *status, int options) { 779 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 780 0 /* rusage */); 781 } 782 783 uptr internal_getpid() { 784 return internal_syscall(SYSCALL(getpid)); 785 } 786 787 uptr internal_getppid() { 788 return internal_syscall(SYSCALL(getppid)); 789 } 790 791 int internal_dlinfo(void *handle, int request, void *p) { 792 #if SANITIZER_FREEBSD 793 return dlinfo(handle, request, p); 794 #else 795 UNIMPLEMENTED(); 796 #endif 797 } 798 799 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 800 #if SANITIZER_FREEBSD 801 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 802 # elif SANITIZER_LINUX 803 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 804 # else 805 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 806 # endif 807 } 808 809 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 810 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 811 } 812 813 #if SANITIZER_LINUX 814 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 815 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 816 } 817 # if defined(__x86_64__) 818 # include <asm/unistd_64.h> 819 // Currently internal_arch_prctl() is only needed on x86_64. 820 uptr internal_arch_prctl(int option, uptr arg2) { 821 return internal_syscall(__NR_arch_prctl, option, arg2); 822 } 823 # endif 824 # endif 825 826 uptr internal_sigaltstack(const void *ss, void *oss) { 827 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 828 } 829 830 int internal_fork() { 831 # if SANITIZER_LINUX 832 # if SANITIZER_S390 833 return internal_syscall(SYSCALL(clone), 0, SIGCHLD); 834 # else 835 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 836 # endif 837 # else 838 return internal_syscall(SYSCALL(fork)); 839 # endif 840 } 841 842 #if SANITIZER_FREEBSD 843 int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 844 uptr *oldlenp, const void *newp, uptr newlen) { 845 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 846 (size_t *)oldlenp, newp, (size_t)newlen); 847 } 848 849 int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 850 const void *newp, uptr newlen) { 851 // Note: this function can be called during startup, so we need to avoid 852 // calling any interceptable functions. On FreeBSD >= 1300045 sysctlbyname() 853 // is a real syscall, but for older versions it calls sysctlnametomib() 854 // followed by sysctl(). To avoid calling the intercepted version and 855 // asserting if this happens during startup, call the real sysctlnametomib() 856 // followed by internal_sysctl() if the syscall is not available. 857 #ifdef SYS___sysctlbyname 858 return internal_syscall(SYSCALL(__sysctlbyname), sname, 859 internal_strlen(sname), oldp, (size_t *)oldlenp, newp, 860 (size_t)newlen); 861 #else 862 static decltype(sysctlnametomib) *real_sysctlnametomib = nullptr; 863 if (!real_sysctlnametomib) 864 real_sysctlnametomib = 865 (decltype(sysctlnametomib) *)dlsym(RTLD_NEXT, "sysctlnametomib"); 866 CHECK(real_sysctlnametomib); 867 868 int oid[CTL_MAXNAME]; 869 size_t len = CTL_MAXNAME; 870 if (real_sysctlnametomib(sname, oid, &len) == -1) 871 return (-1); 872 return internal_sysctl(oid, len, oldp, oldlenp, newp, newlen); 873 #endif 874 } 875 #endif 876 877 #if SANITIZER_LINUX 878 #define SA_RESTORER 0x04000000 879 // Doesn't set sa_restorer if the caller did not set it, so use with caution 880 //(see below). 881 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 882 __sanitizer_kernel_sigaction_t k_act, k_oldact; 883 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 884 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 885 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 886 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 887 if (u_act) { 888 k_act.handler = u_act->handler; 889 k_act.sigaction = u_act->sigaction; 890 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 891 sizeof(__sanitizer_kernel_sigset_t)); 892 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 893 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 894 // FIXME: most often sa_restorer is unset, however the kernel requires it 895 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 896 // If sa_restorer passed to the kernel is NULL, the program may crash upon 897 // signal delivery or fail to unwind the stack in the signal handler. 898 // libc implementation of sigaction() passes its own restorer to 899 // rt_sigaction, so we need to do the same (we'll need to reimplement the 900 // restorers; for x86_64 the restorer address can be obtained from 901 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 902 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 903 k_act.sa_restorer = u_act->sa_restorer; 904 #endif 905 } 906 907 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 908 (uptr)(u_act ? &k_act : nullptr), 909 (uptr)(u_oldact ? &k_oldact : nullptr), 910 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 911 912 if ((result == 0) && u_oldact) { 913 u_oldact->handler = k_oldact.handler; 914 u_oldact->sigaction = k_oldact.sigaction; 915 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 916 sizeof(__sanitizer_kernel_sigset_t)); 917 u_oldact->sa_flags = k_oldact.sa_flags; 918 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 919 u_oldact->sa_restorer = k_oldact.sa_restorer; 920 #endif 921 } 922 return result; 923 } 924 #endif // SANITIZER_LINUX 925 926 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 927 __sanitizer_sigset_t *oldset) { 928 #if SANITIZER_FREEBSD 929 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 930 #else 931 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 932 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 933 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, (uptr)k_set, 934 (uptr)k_oldset, sizeof(__sanitizer_kernel_sigset_t)); 935 #endif 936 } 937 938 void internal_sigfillset(__sanitizer_sigset_t *set) { 939 internal_memset(set, 0xff, sizeof(*set)); 940 } 941 942 void internal_sigemptyset(__sanitizer_sigset_t *set) { 943 internal_memset(set, 0, sizeof(*set)); 944 } 945 946 #if SANITIZER_LINUX 947 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 948 signum -= 1; 949 CHECK_GE(signum, 0); 950 CHECK_LT(signum, sizeof(*set) * 8); 951 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 952 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 953 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 954 k_set->sig[idx] &= ~((uptr)1 << bit); 955 } 956 957 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 958 signum -= 1; 959 CHECK_GE(signum, 0); 960 CHECK_LT(signum, sizeof(*set) * 8); 961 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 962 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 963 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 964 return k_set->sig[idx] & ((uptr)1 << bit); 965 } 966 #elif SANITIZER_FREEBSD 967 uptr internal_procctl(int type, int id, int cmd, void *data) { 968 return internal_syscall(SYSCALL(procctl), type, id, cmd, data); 969 } 970 971 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 972 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 973 sigdelset(rset, signum); 974 } 975 976 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 977 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 978 return sigismember(rset, signum); 979 } 980 #endif 981 #endif // !SANITIZER_SOLARIS 982 983 #if !SANITIZER_NETBSD 984 // ThreadLister implementation. 985 ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) { 986 char task_directory_path[80]; 987 internal_snprintf(task_directory_path, sizeof(task_directory_path), 988 "/proc/%d/task/", pid); 989 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 990 if (internal_iserror(descriptor_)) { 991 Report("Can't open /proc/%d/task for reading.\n", pid); 992 } 993 } 994 995 ThreadLister::Result ThreadLister::ListThreads( 996 InternalMmapVector<tid_t> *threads) { 997 if (internal_iserror(descriptor_)) 998 return Error; 999 internal_lseek(descriptor_, 0, SEEK_SET); 1000 threads->clear(); 1001 1002 Result result = Ok; 1003 for (bool first_read = true;; first_read = false) { 1004 // Resize to max capacity if it was downsized by IsAlive. 1005 buffer_.resize(buffer_.capacity()); 1006 CHECK_GE(buffer_.size(), 4096); 1007 uptr read = internal_getdents( 1008 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size()); 1009 if (!read) 1010 return result; 1011 if (internal_iserror(read)) { 1012 Report("Can't read directory entries from /proc/%d/task.\n", pid_); 1013 return Error; 1014 } 1015 1016 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 1017 struct linux_dirent *entry = (struct linux_dirent *)begin; 1018 begin += entry->d_reclen; 1019 if (entry->d_ino == 1) { 1020 // Inode 1 is for bad blocks and also can be a reason for early return. 1021 // Should be emitted if kernel tried to output terminating thread. 1022 // See proc_task_readdir implementation in Linux. 1023 result = Incomplete; 1024 } 1025 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 1026 threads->push_back(internal_atoll(entry->d_name)); 1027 } 1028 1029 // Now we are going to detect short-read or early EOF. In such cases Linux 1030 // can return inconsistent list with missing alive threads. 1031 // Code will just remember that the list can be incomplete but it will 1032 // continue reads to return as much as possible. 1033 if (!first_read) { 1034 // The first one was a short-read by definition. 1035 result = Incomplete; 1036 } else if (read > buffer_.size() - 1024) { 1037 // Read was close to the buffer size. So double the size and assume the 1038 // worst. 1039 buffer_.resize(buffer_.size() * 2); 1040 result = Incomplete; 1041 } else if (!threads->empty() && !IsAlive(threads->back())) { 1042 // Maybe Linux early returned from read on terminated thread (!pid_alive) 1043 // and failed to restore read position. 1044 // See next_tid and proc_task_instantiate in Linux. 1045 result = Incomplete; 1046 } 1047 } 1048 } 1049 1050 bool ThreadLister::IsAlive(int tid) { 1051 // /proc/%d/task/%d/status uses same call to detect alive threads as 1052 // proc_task_readdir. See task_state implementation in Linux. 1053 char path[80]; 1054 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid); 1055 if (!ReadFileToVector(path, &buffer_) || buffer_.empty()) 1056 return false; 1057 buffer_.push_back(0); 1058 static const char kPrefix[] = "\nPPid:"; 1059 const char *field = internal_strstr(buffer_.data(), kPrefix); 1060 if (!field) 1061 return false; 1062 field += internal_strlen(kPrefix); 1063 return (int)internal_atoll(field) != 0; 1064 } 1065 1066 ThreadLister::~ThreadLister() { 1067 if (!internal_iserror(descriptor_)) 1068 internal_close(descriptor_); 1069 } 1070 #endif 1071 1072 #if SANITIZER_WORDSIZE == 32 1073 // Take care of unusable kernel area in top gigabyte. 1074 static uptr GetKernelAreaSize() { 1075 #if SANITIZER_LINUX && !SANITIZER_X32 1076 const uptr gbyte = 1UL << 30; 1077 1078 // Firstly check if there are writable segments 1079 // mapped to top gigabyte (e.g. stack). 1080 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 1081 if (proc_maps.Error()) 1082 return 0; 1083 MemoryMappedSegment segment; 1084 while (proc_maps.Next(&segment)) { 1085 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0; 1086 } 1087 1088 #if !SANITIZER_ANDROID 1089 // Even if nothing is mapped, top Gb may still be accessible 1090 // if we are running on 64-bit kernel. 1091 // Uname may report misleading results if personality type 1092 // is modified (e.g. under schroot) so check this as well. 1093 struct utsname uname_info; 1094 int pers = personality(0xffffffffUL); 1095 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 && 1096 internal_strstr(uname_info.machine, "64")) 1097 return 0; 1098 #endif // SANITIZER_ANDROID 1099 1100 // Top gigabyte is reserved for kernel. 1101 return gbyte; 1102 #else 1103 return 0; 1104 #endif // SANITIZER_LINUX && !SANITIZER_X32 1105 } 1106 #endif // SANITIZER_WORDSIZE == 32 1107 1108 uptr GetMaxVirtualAddress() { 1109 #if SANITIZER_NETBSD && defined(__x86_64__) 1110 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE) 1111 #elif SANITIZER_WORDSIZE == 64 1112 # if defined(__powerpc64__) || defined(__aarch64__) || defined(__loongarch__) 1113 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 1114 // We somehow need to figure out which one we are using now and choose 1115 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 1116 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 1117 // of the address space, so simply checking the stack address is not enough. 1118 // This should (does) work for both PowerPC64 Endian modes. 1119 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit. 1120 // loongarch64 also has multiple address space layouts: default is 47-bit. 1121 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1; 1122 #elif SANITIZER_RISCV64 1123 return (1ULL << 38) - 1; 1124 # elif SANITIZER_MIPS64 1125 return (1ULL << 40) - 1; // 0x000000ffffffffffUL; 1126 # elif defined(__s390x__) 1127 return (1ULL << 53) - 1; // 0x001fffffffffffffUL; 1128 #elif defined(__sparc__) 1129 return ~(uptr)0; 1130 # else 1131 return (1ULL << 47) - 1; // 0x00007fffffffffffUL; 1132 # endif 1133 #else // SANITIZER_WORDSIZE == 32 1134 # if defined(__s390__) 1135 return (1ULL << 31) - 1; // 0x7fffffff; 1136 # else 1137 return (1ULL << 32) - 1; // 0xffffffff; 1138 # endif 1139 #endif // SANITIZER_WORDSIZE 1140 } 1141 1142 uptr GetMaxUserVirtualAddress() { 1143 uptr addr = GetMaxVirtualAddress(); 1144 #if SANITIZER_WORDSIZE == 32 && !defined(__s390__) 1145 if (!common_flags()->full_address_space) 1146 addr -= GetKernelAreaSize(); 1147 CHECK_LT(reinterpret_cast<uptr>(&addr), addr); 1148 #endif 1149 return addr; 1150 } 1151 1152 #if !SANITIZER_ANDROID 1153 uptr GetPageSize() { 1154 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) && \ 1155 defined(EXEC_PAGESIZE) 1156 return EXEC_PAGESIZE; 1157 #elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1158 // Use sysctl as sysconf can trigger interceptors internally. 1159 int pz = 0; 1160 uptr pzl = sizeof(pz); 1161 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1162 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1163 CHECK_EQ(rv, 0); 1164 return (uptr)pz; 1165 #elif SANITIZER_USE_GETAUXVAL 1166 return getauxval(AT_PAGESZ); 1167 #else 1168 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1169 #endif 1170 } 1171 #endif // !SANITIZER_ANDROID 1172 1173 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { 1174 #if SANITIZER_SOLARIS 1175 const char *default_module_name = getexecname(); 1176 CHECK_NE(default_module_name, NULL); 1177 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1178 #else 1179 #if SANITIZER_FREEBSD || SANITIZER_NETBSD 1180 #if SANITIZER_FREEBSD 1181 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1182 #else 1183 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1184 #endif 1185 const char *default_module_name = "kern.proc.pathname"; 1186 uptr Size = buf_len; 1187 bool IsErr = 1188 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1189 int readlink_error = IsErr ? errno : 0; 1190 uptr module_name_len = Size; 1191 #else 1192 const char *default_module_name = "/proc/self/exe"; 1193 uptr module_name_len = internal_readlink( 1194 default_module_name, buf, buf_len); 1195 int readlink_error; 1196 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1197 #endif // SANITIZER_SOLARIS 1198 if (IsErr) { 1199 // We can't read binary name for some reason, assume it's unknown. 1200 Report("WARNING: reading executable name failed with errno %d, " 1201 "some stack frames may not be symbolized\n", readlink_error); 1202 module_name_len = internal_snprintf(buf, buf_len, "%s", 1203 default_module_name); 1204 CHECK_LT(module_name_len, buf_len); 1205 } 1206 return module_name_len; 1207 #endif 1208 } 1209 1210 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1211 #if SANITIZER_LINUX 1212 char *tmpbuf; 1213 uptr tmpsize; 1214 uptr tmplen; 1215 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1216 1024 * 1024)) { 1217 internal_strncpy(buf, tmpbuf, buf_len); 1218 UnmapOrDie(tmpbuf, tmpsize); 1219 return internal_strlen(buf); 1220 } 1221 #endif 1222 return ReadBinaryName(buf, buf_len); 1223 } 1224 1225 // Match full names of the form /path/to/base_name{-,.}* 1226 bool LibraryNameIs(const char *full_name, const char *base_name) { 1227 const char *name = full_name; 1228 // Strip path. 1229 while (*name != '\0') name++; 1230 while (name > full_name && *name != '/') name--; 1231 if (*name == '/') name++; 1232 uptr base_name_length = internal_strlen(base_name); 1233 if (internal_strncmp(name, base_name, base_name_length)) return false; 1234 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1235 } 1236 1237 #if !SANITIZER_ANDROID 1238 // Call cb for each region mapped by map. 1239 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1240 CHECK_NE(map, nullptr); 1241 #if !SANITIZER_FREEBSD 1242 typedef ElfW(Phdr) Elf_Phdr; 1243 typedef ElfW(Ehdr) Elf_Ehdr; 1244 #endif // !SANITIZER_FREEBSD 1245 char *base = (char *)map->l_addr; 1246 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1247 char *phdrs = base + ehdr->e_phoff; 1248 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1249 1250 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1251 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1252 // objects have a non-zero base. 1253 uptr preferred_base = (uptr)-1; 1254 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1255 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1256 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1257 preferred_base = (uptr)phdr->p_vaddr; 1258 } 1259 1260 // Compute the delta from the real base to get a relocation delta. 1261 sptr delta = (uptr)base - preferred_base; 1262 // Now we can figure out what the loader really mapped. 1263 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1264 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1265 if (phdr->p_type == PT_LOAD) { 1266 uptr seg_start = phdr->p_vaddr + delta; 1267 uptr seg_end = seg_start + phdr->p_memsz; 1268 // None of these values are aligned. We consider the ragged edges of the 1269 // load command as defined, since they are mapped from the file. 1270 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1271 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1272 cb((void *)seg_start, seg_end - seg_start); 1273 } 1274 } 1275 } 1276 #endif 1277 1278 #if SANITIZER_LINUX 1279 #if defined(__x86_64__) 1280 // We cannot use glibc's clone wrapper, because it messes with the child 1281 // task's TLS. It writes the PID and TID of the child task to its thread 1282 // descriptor, but in our case the child task shares the thread descriptor with 1283 // the parent (because we don't know how to allocate a new thread 1284 // descriptor to keep glibc happy). So the stock version of clone(), when 1285 // used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1286 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1287 int *parent_tidptr, void *newtls, int *child_tidptr) { 1288 long long res; 1289 if (!fn || !child_stack) 1290 return -EINVAL; 1291 CHECK_EQ(0, (uptr)child_stack % 16); 1292 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1293 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1294 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1295 register void *r8 __asm__("r8") = newtls; 1296 register int *r10 __asm__("r10") = child_tidptr; 1297 __asm__ __volatile__( 1298 /* %rax = syscall(%rax = SYSCALL(clone), 1299 * %rdi = flags, 1300 * %rsi = child_stack, 1301 * %rdx = parent_tidptr, 1302 * %r8 = new_tls, 1303 * %r10 = child_tidptr) 1304 */ 1305 "syscall\n" 1306 1307 /* if (%rax != 0) 1308 * return; 1309 */ 1310 "testq %%rax,%%rax\n" 1311 "jnz 1f\n" 1312 1313 /* In the child. Terminate unwind chain. */ 1314 // XXX: We should also terminate the CFI unwind chain 1315 // here. Unfortunately clang 3.2 doesn't support the 1316 // necessary CFI directives, so we skip that part. 1317 "xorq %%rbp,%%rbp\n" 1318 1319 /* Call "fn(arg)". */ 1320 "popq %%rax\n" 1321 "popq %%rdi\n" 1322 "call *%%rax\n" 1323 1324 /* Call _exit(%rax). */ 1325 "movq %%rax,%%rdi\n" 1326 "movq %2,%%rax\n" 1327 "syscall\n" 1328 1329 /* Return to parent. */ 1330 "1:\n" 1331 : "=a" (res) 1332 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1333 "S"(child_stack), 1334 "D"(flags), 1335 "d"(parent_tidptr), 1336 "r"(r8), 1337 "r"(r10) 1338 : "memory", "r11", "rcx"); 1339 return res; 1340 } 1341 #elif defined(__mips__) 1342 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1343 int *parent_tidptr, void *newtls, int *child_tidptr) { 1344 long long res; 1345 if (!fn || !child_stack) 1346 return -EINVAL; 1347 CHECK_EQ(0, (uptr)child_stack % 16); 1348 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1349 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1350 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1351 register void *a3 __asm__("$7") = newtls; 1352 register int *a4 __asm__("$8") = child_tidptr; 1353 // We don't have proper CFI directives here because it requires alot of code 1354 // for very marginal benefits. 1355 __asm__ __volatile__( 1356 /* $v0 = syscall($v0 = __NR_clone, 1357 * $a0 = flags, 1358 * $a1 = child_stack, 1359 * $a2 = parent_tidptr, 1360 * $a3 = new_tls, 1361 * $a4 = child_tidptr) 1362 */ 1363 ".cprestore 16;\n" 1364 "move $4,%1;\n" 1365 "move $5,%2;\n" 1366 "move $6,%3;\n" 1367 "move $7,%4;\n" 1368 /* Store the fifth argument on stack 1369 * if we are using 32-bit abi. 1370 */ 1371 #if SANITIZER_WORDSIZE == 32 1372 "lw %5,16($29);\n" 1373 #else 1374 "move $8,%5;\n" 1375 #endif 1376 "li $2,%6;\n" 1377 "syscall;\n" 1378 1379 /* if ($v0 != 0) 1380 * return; 1381 */ 1382 "bnez $2,1f;\n" 1383 1384 /* Call "fn(arg)". */ 1385 #if SANITIZER_WORDSIZE == 32 1386 #ifdef __BIG_ENDIAN__ 1387 "lw $25,4($29);\n" 1388 "lw $4,12($29);\n" 1389 #else 1390 "lw $25,0($29);\n" 1391 "lw $4,8($29);\n" 1392 #endif 1393 #else 1394 "ld $25,0($29);\n" 1395 "ld $4,8($29);\n" 1396 #endif 1397 "jal $25;\n" 1398 1399 /* Call _exit($v0). */ 1400 "move $4,$2;\n" 1401 "li $2,%7;\n" 1402 "syscall;\n" 1403 1404 /* Return to parent. */ 1405 "1:\n" 1406 : "=r" (res) 1407 : "r"(flags), 1408 "r"(child_stack), 1409 "r"(parent_tidptr), 1410 "r"(a3), 1411 "r"(a4), 1412 "i"(__NR_clone), 1413 "i"(__NR_exit) 1414 : "memory", "$29" ); 1415 return res; 1416 } 1417 #elif SANITIZER_RISCV64 1418 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1419 int *parent_tidptr, void *newtls, int *child_tidptr) { 1420 if (!fn || !child_stack) 1421 return -EINVAL; 1422 1423 CHECK_EQ(0, (uptr)child_stack % 16); 1424 1425 register int res __asm__("a0"); 1426 register int __flags __asm__("a0") = flags; 1427 register void *__stack __asm__("a1") = child_stack; 1428 register int *__ptid __asm__("a2") = parent_tidptr; 1429 register void *__tls __asm__("a3") = newtls; 1430 register int *__ctid __asm__("a4") = child_tidptr; 1431 register int (*__fn)(void *) __asm__("a5") = fn; 1432 register void *__arg __asm__("a6") = arg; 1433 register int nr_clone __asm__("a7") = __NR_clone; 1434 1435 __asm__ __volatile__( 1436 "ecall\n" 1437 1438 /* if (a0 != 0) 1439 * return a0; 1440 */ 1441 "bnez a0, 1f\n" 1442 1443 // In the child, now. Call "fn(arg)". 1444 "mv a0, a6\n" 1445 "jalr a5\n" 1446 1447 // Call _exit(a0). 1448 "addi a7, zero, %9\n" 1449 "ecall\n" 1450 "1:\n" 1451 1452 : "=r"(res) 1453 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__tls), "r"(__ctid), 1454 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit) 1455 : "memory"); 1456 return res; 1457 } 1458 #elif defined(__aarch64__) 1459 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1460 int *parent_tidptr, void *newtls, int *child_tidptr) { 1461 register long long res __asm__("x0"); 1462 if (!fn || !child_stack) 1463 return -EINVAL; 1464 CHECK_EQ(0, (uptr)child_stack % 16); 1465 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1466 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1467 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1468 1469 register int (*__fn)(void *) __asm__("x0") = fn; 1470 register void *__stack __asm__("x1") = child_stack; 1471 register int __flags __asm__("x2") = flags; 1472 register void *__arg __asm__("x3") = arg; 1473 register int *__ptid __asm__("x4") = parent_tidptr; 1474 register void *__tls __asm__("x5") = newtls; 1475 register int *__ctid __asm__("x6") = child_tidptr; 1476 1477 __asm__ __volatile__( 1478 "mov x0,x2\n" /* flags */ 1479 "mov x2,x4\n" /* ptid */ 1480 "mov x3,x5\n" /* tls */ 1481 "mov x4,x6\n" /* ctid */ 1482 "mov x8,%9\n" /* clone */ 1483 1484 "svc 0x0\n" 1485 1486 /* if (%r0 != 0) 1487 * return %r0; 1488 */ 1489 "cmp x0, #0\n" 1490 "bne 1f\n" 1491 1492 /* In the child, now. Call "fn(arg)". */ 1493 "ldp x1, x0, [sp], #16\n" 1494 "blr x1\n" 1495 1496 /* Call _exit(%r0). */ 1497 "mov x8, %10\n" 1498 "svc 0x0\n" 1499 "1:\n" 1500 1501 : "=r" (res) 1502 : "i"(-EINVAL), 1503 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1504 "r"(__ptid), "r"(__tls), "r"(__ctid), 1505 "i"(__NR_clone), "i"(__NR_exit) 1506 : "x30", "memory"); 1507 return res; 1508 } 1509 #elif SANITIZER_LOONGARCH64 1510 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1511 int *parent_tidptr, void *newtls, int *child_tidptr) { 1512 if (!fn || !child_stack) 1513 return -EINVAL; 1514 1515 CHECK_EQ(0, (uptr)child_stack % 16); 1516 1517 register int res __asm__("$a0"); 1518 register int __flags __asm__("$a0") = flags; 1519 register void *__stack __asm__("$a1") = child_stack; 1520 register int *__ptid __asm__("$a2") = parent_tidptr; 1521 register int *__ctid __asm__("$a3") = child_tidptr; 1522 register void *__tls __asm__("$a4") = newtls; 1523 register int (*__fn)(void *) __asm__("$a5") = fn; 1524 register void *__arg __asm__("$a6") = arg; 1525 register int nr_clone __asm__("$a7") = __NR_clone; 1526 1527 __asm__ __volatile__( 1528 "syscall 0\n" 1529 1530 // if ($a0 != 0) 1531 // return $a0; 1532 "bnez $a0, 1f\n" 1533 1534 // In the child, now. Call "fn(arg)". 1535 "move $a0, $a6\n" 1536 "jirl $ra, $a5, 0\n" 1537 1538 // Call _exit($a0). 1539 "addi.d $a7, $zero, %9\n" 1540 "syscall 0\n" 1541 1542 "1:\n" 1543 1544 : "=r"(res) 1545 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__ctid), "r"(__tls), 1546 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit) 1547 : "memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8"); 1548 return res; 1549 } 1550 #elif defined(__powerpc64__) 1551 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1552 int *parent_tidptr, void *newtls, int *child_tidptr) { 1553 long long res; 1554 // Stack frame structure. 1555 #if SANITIZER_PPC64V1 1556 // Back chain == 0 (SP + 112) 1557 // Frame (112 bytes): 1558 // Parameter save area (SP + 48), 8 doublewords 1559 // TOC save area (SP + 40) 1560 // Link editor doubleword (SP + 32) 1561 // Compiler doubleword (SP + 24) 1562 // LR save area (SP + 16) 1563 // CR save area (SP + 8) 1564 // Back chain (SP + 0) 1565 # define FRAME_SIZE 112 1566 # define FRAME_TOC_SAVE_OFFSET 40 1567 #elif SANITIZER_PPC64V2 1568 // Back chain == 0 (SP + 32) 1569 // Frame (32 bytes): 1570 // TOC save area (SP + 24) 1571 // LR save area (SP + 16) 1572 // CR save area (SP + 8) 1573 // Back chain (SP + 0) 1574 # define FRAME_SIZE 32 1575 # define FRAME_TOC_SAVE_OFFSET 24 1576 #else 1577 # error "Unsupported PPC64 ABI" 1578 #endif 1579 if (!fn || !child_stack) 1580 return -EINVAL; 1581 CHECK_EQ(0, (uptr)child_stack % 16); 1582 1583 register int (*__fn)(void *) __asm__("r3") = fn; 1584 register void *__cstack __asm__("r4") = child_stack; 1585 register int __flags __asm__("r5") = flags; 1586 register void *__arg __asm__("r6") = arg; 1587 register int *__ptidptr __asm__("r7") = parent_tidptr; 1588 register void *__newtls __asm__("r8") = newtls; 1589 register int *__ctidptr __asm__("r9") = child_tidptr; 1590 1591 __asm__ __volatile__( 1592 /* fn and arg are saved across the syscall */ 1593 "mr 28, %5\n\t" 1594 "mr 27, %8\n\t" 1595 1596 /* syscall 1597 r0 == __NR_clone 1598 r3 == flags 1599 r4 == child_stack 1600 r5 == parent_tidptr 1601 r6 == newtls 1602 r7 == child_tidptr */ 1603 "mr 3, %7\n\t" 1604 "mr 5, %9\n\t" 1605 "mr 6, %10\n\t" 1606 "mr 7, %11\n\t" 1607 "li 0, %3\n\t" 1608 "sc\n\t" 1609 1610 /* Test if syscall was successful */ 1611 "cmpdi cr1, 3, 0\n\t" 1612 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1613 "bne- cr1, 1f\n\t" 1614 1615 /* Set up stack frame */ 1616 "li 29, 0\n\t" 1617 "stdu 29, -8(1)\n\t" 1618 "stdu 1, -%12(1)\n\t" 1619 /* Do the function call */ 1620 "std 2, %13(1)\n\t" 1621 #if SANITIZER_PPC64V1 1622 "ld 0, 0(28)\n\t" 1623 "ld 2, 8(28)\n\t" 1624 "mtctr 0\n\t" 1625 #elif SANITIZER_PPC64V2 1626 "mr 12, 28\n\t" 1627 "mtctr 12\n\t" 1628 #else 1629 # error "Unsupported PPC64 ABI" 1630 #endif 1631 "mr 3, 27\n\t" 1632 "bctrl\n\t" 1633 "ld 2, %13(1)\n\t" 1634 1635 /* Call _exit(r3) */ 1636 "li 0, %4\n\t" 1637 "sc\n\t" 1638 1639 /* Return to parent */ 1640 "1:\n\t" 1641 "mr %0, 3\n\t" 1642 : "=r" (res) 1643 : "0" (-1), 1644 "i" (EINVAL), 1645 "i" (__NR_clone), 1646 "i" (__NR_exit), 1647 "r" (__fn), 1648 "r" (__cstack), 1649 "r" (__flags), 1650 "r" (__arg), 1651 "r" (__ptidptr), 1652 "r" (__newtls), 1653 "r" (__ctidptr), 1654 "i" (FRAME_SIZE), 1655 "i" (FRAME_TOC_SAVE_OFFSET) 1656 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1657 return res; 1658 } 1659 #elif defined(__i386__) 1660 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1661 int *parent_tidptr, void *newtls, int *child_tidptr) { 1662 int res; 1663 if (!fn || !child_stack) 1664 return -EINVAL; 1665 CHECK_EQ(0, (uptr)child_stack % 16); 1666 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1667 ((unsigned int *)child_stack)[0] = (uptr)flags; 1668 ((unsigned int *)child_stack)[1] = (uptr)0; 1669 ((unsigned int *)child_stack)[2] = (uptr)fn; 1670 ((unsigned int *)child_stack)[3] = (uptr)arg; 1671 __asm__ __volatile__( 1672 /* %eax = syscall(%eax = SYSCALL(clone), 1673 * %ebx = flags, 1674 * %ecx = child_stack, 1675 * %edx = parent_tidptr, 1676 * %esi = new_tls, 1677 * %edi = child_tidptr) 1678 */ 1679 1680 /* Obtain flags */ 1681 "movl (%%ecx), %%ebx\n" 1682 /* Do the system call */ 1683 "pushl %%ebx\n" 1684 "pushl %%esi\n" 1685 "pushl %%edi\n" 1686 /* Remember the flag value. */ 1687 "movl %%ebx, (%%ecx)\n" 1688 "int $0x80\n" 1689 "popl %%edi\n" 1690 "popl %%esi\n" 1691 "popl %%ebx\n" 1692 1693 /* if (%eax != 0) 1694 * return; 1695 */ 1696 1697 "test %%eax,%%eax\n" 1698 "jnz 1f\n" 1699 1700 /* terminate the stack frame */ 1701 "xorl %%ebp,%%ebp\n" 1702 /* Call FN. */ 1703 "call *%%ebx\n" 1704 #ifdef PIC 1705 "call here\n" 1706 "here:\n" 1707 "popl %%ebx\n" 1708 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1709 #endif 1710 /* Call exit */ 1711 "movl %%eax, %%ebx\n" 1712 "movl %2, %%eax\n" 1713 "int $0x80\n" 1714 "1:\n" 1715 : "=a" (res) 1716 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1717 "c"(child_stack), 1718 "d"(parent_tidptr), 1719 "S"(newtls), 1720 "D"(child_tidptr) 1721 : "memory"); 1722 return res; 1723 } 1724 #elif defined(__arm__) 1725 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1726 int *parent_tidptr, void *newtls, int *child_tidptr) { 1727 unsigned int res; 1728 if (!fn || !child_stack) 1729 return -EINVAL; 1730 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1731 ((unsigned int *)child_stack)[0] = (uptr)fn; 1732 ((unsigned int *)child_stack)[1] = (uptr)arg; 1733 register int r0 __asm__("r0") = flags; 1734 register void *r1 __asm__("r1") = child_stack; 1735 register int *r2 __asm__("r2") = parent_tidptr; 1736 register void *r3 __asm__("r3") = newtls; 1737 register int *r4 __asm__("r4") = child_tidptr; 1738 register int r7 __asm__("r7") = __NR_clone; 1739 1740 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) 1741 # define ARCH_HAS_BX 1742 #endif 1743 #if __ARM_ARCH > 4 1744 # define ARCH_HAS_BLX 1745 #endif 1746 1747 #ifdef ARCH_HAS_BX 1748 # ifdef ARCH_HAS_BLX 1749 # define BLX(R) "blx " #R "\n" 1750 # else 1751 # define BLX(R) "mov lr, pc; bx " #R "\n" 1752 # endif 1753 #else 1754 # define BLX(R) "mov lr, pc; mov pc," #R "\n" 1755 #endif 1756 1757 __asm__ __volatile__( 1758 /* %r0 = syscall(%r7 = SYSCALL(clone), 1759 * %r0 = flags, 1760 * %r1 = child_stack, 1761 * %r2 = parent_tidptr, 1762 * %r3 = new_tls, 1763 * %r4 = child_tidptr) 1764 */ 1765 1766 /* Do the system call */ 1767 "swi 0x0\n" 1768 1769 /* if (%r0 != 0) 1770 * return %r0; 1771 */ 1772 "cmp r0, #0\n" 1773 "bne 1f\n" 1774 1775 /* In the child, now. Call "fn(arg)". */ 1776 "ldr r0, [sp, #4]\n" 1777 "ldr ip, [sp], #8\n" 1778 BLX(ip) 1779 /* Call _exit(%r0). */ 1780 "mov r7, %7\n" 1781 "swi 0x0\n" 1782 "1:\n" 1783 "mov %0, r0\n" 1784 : "=r"(res) 1785 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), 1786 "i"(__NR_exit) 1787 : "memory"); 1788 return res; 1789 } 1790 #endif 1791 #endif // SANITIZER_LINUX 1792 1793 #if SANITIZER_LINUX 1794 int internal_uname(struct utsname *buf) { 1795 return internal_syscall(SYSCALL(uname), buf); 1796 } 1797 #endif 1798 1799 #if SANITIZER_ANDROID 1800 #if __ANDROID_API__ < 21 1801 extern "C" __attribute__((weak)) int dl_iterate_phdr( 1802 int (*)(struct dl_phdr_info *, size_t, void *), void *); 1803 #endif 1804 1805 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, 1806 void *data) { 1807 // Any name starting with "lib" indicates a bug in L where library base names 1808 // are returned instead of paths. 1809 if (info->dlpi_name && info->dlpi_name[0] == 'l' && 1810 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { 1811 *(bool *)data = true; 1812 return 1; 1813 } 1814 return 0; 1815 } 1816 1817 static atomic_uint32_t android_api_level; 1818 1819 static AndroidApiLevel AndroidDetectApiLevelStatic() { 1820 #if __ANDROID_API__ <= 19 1821 return ANDROID_KITKAT; 1822 #elif __ANDROID_API__ <= 22 1823 return ANDROID_LOLLIPOP_MR1; 1824 #else 1825 return ANDROID_POST_LOLLIPOP; 1826 #endif 1827 } 1828 1829 static AndroidApiLevel AndroidDetectApiLevel() { 1830 if (!&dl_iterate_phdr) 1831 return ANDROID_KITKAT; // K or lower 1832 bool base_name_seen = false; 1833 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); 1834 if (base_name_seen) 1835 return ANDROID_LOLLIPOP_MR1; // L MR1 1836 return ANDROID_POST_LOLLIPOP; // post-L 1837 // Plain L (API level 21) is completely broken wrt ASan and not very 1838 // interesting to detect. 1839 } 1840 1841 extern "C" __attribute__((weak)) void* _DYNAMIC; 1842 1843 AndroidApiLevel AndroidGetApiLevel() { 1844 AndroidApiLevel level = 1845 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); 1846 if (level) return level; 1847 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic() 1848 : AndroidDetectApiLevel(); 1849 atomic_store(&android_api_level, level, memory_order_relaxed); 1850 return level; 1851 } 1852 1853 #endif 1854 1855 static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1856 switch (signum) { 1857 case SIGABRT: 1858 return common_flags()->handle_abort; 1859 case SIGILL: 1860 return common_flags()->handle_sigill; 1861 case SIGTRAP: 1862 return common_flags()->handle_sigtrap; 1863 case SIGFPE: 1864 return common_flags()->handle_sigfpe; 1865 case SIGSEGV: 1866 return common_flags()->handle_segv; 1867 case SIGBUS: 1868 return common_flags()->handle_sigbus; 1869 } 1870 return kHandleSignalNo; 1871 } 1872 1873 HandleSignalMode GetHandleSignalMode(int signum) { 1874 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1875 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1876 return kHandleSignalExclusive; 1877 return result; 1878 } 1879 1880 #if !SANITIZER_GO 1881 void *internal_start_thread(void *(*func)(void *arg), void *arg) { 1882 if (&real_pthread_create == 0) 1883 return nullptr; 1884 // Start the thread with signals blocked, otherwise it can steal user signals. 1885 ScopedBlockSignals block(nullptr); 1886 void *th; 1887 real_pthread_create(&th, nullptr, func, arg); 1888 return th; 1889 } 1890 1891 void internal_join_thread(void *th) { 1892 if (&real_pthread_join) 1893 real_pthread_join(th, nullptr); 1894 } 1895 #else 1896 void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; } 1897 1898 void internal_join_thread(void *th) {} 1899 #endif 1900 1901 #if SANITIZER_LINUX && defined(__aarch64__) 1902 // Android headers in the older NDK releases miss this definition. 1903 struct __sanitizer_esr_context { 1904 struct _aarch64_ctx head; 1905 uint64_t esr; 1906 }; 1907 1908 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1909 static const u32 kEsrMagic = 0x45535201; 1910 u8 *aux = reinterpret_cast<u8 *>(ucontext->uc_mcontext.__reserved); 1911 while (true) { 1912 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1913 if (ctx->size == 0) break; 1914 if (ctx->magic == kEsrMagic) { 1915 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1916 return true; 1917 } 1918 aux += ctx->size; 1919 } 1920 return false; 1921 } 1922 #elif SANITIZER_FREEBSD && defined(__aarch64__) 1923 // FreeBSD doesn't provide ESR in the ucontext. 1924 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1925 return false; 1926 } 1927 #endif 1928 1929 using Context = ucontext_t; 1930 1931 SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1932 Context *ucontext = (Context *)context; 1933 #if defined(__x86_64__) || defined(__i386__) 1934 static const uptr PF_WRITE = 1U << 1; 1935 #if SANITIZER_FREEBSD 1936 uptr err = ucontext->uc_mcontext.mc_err; 1937 #elif SANITIZER_NETBSD 1938 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1939 #elif SANITIZER_SOLARIS && defined(__i386__) 1940 const int Err = 13; 1941 uptr err = ucontext->uc_mcontext.gregs[Err]; 1942 #else 1943 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1944 #endif // SANITIZER_FREEBSD 1945 return err & PF_WRITE ? Write : Read; 1946 #elif defined(__mips__) 1947 uint32_t *exception_source; 1948 uint32_t faulty_instruction; 1949 uint32_t op_code; 1950 1951 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 1952 faulty_instruction = (uint32_t)(*exception_source); 1953 1954 op_code = (faulty_instruction >> 26) & 0x3f; 1955 1956 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 1957 switch (op_code) { 1958 case 0x28: // sb 1959 case 0x29: // sh 1960 case 0x2b: // sw 1961 case 0x3f: // sd 1962 #if __mips_isa_rev < 6 1963 case 0x2c: // sdl 1964 case 0x2d: // sdr 1965 case 0x2a: // swl 1966 case 0x2e: // swr 1967 #endif 1968 return SignalContext::Write; 1969 1970 case 0x20: // lb 1971 case 0x24: // lbu 1972 case 0x21: // lh 1973 case 0x25: // lhu 1974 case 0x23: // lw 1975 case 0x27: // lwu 1976 case 0x37: // ld 1977 #if __mips_isa_rev < 6 1978 case 0x1a: // ldl 1979 case 0x1b: // ldr 1980 case 0x22: // lwl 1981 case 0x26: // lwr 1982 #endif 1983 return SignalContext::Read; 1984 #if __mips_isa_rev == 6 1985 case 0x3b: // pcrel 1986 op_code = (faulty_instruction >> 19) & 0x3; 1987 switch (op_code) { 1988 case 0x1: // lwpc 1989 case 0x2: // lwupc 1990 return SignalContext::Read; 1991 } 1992 #endif 1993 } 1994 return SignalContext::Unknown; 1995 #elif defined(__arm__) 1996 static const uptr FSR_WRITE = 1U << 11; 1997 uptr fsr = ucontext->uc_mcontext.error_code; 1998 return fsr & FSR_WRITE ? Write : Read; 1999 #elif defined(__aarch64__) 2000 static const u64 ESR_ELx_WNR = 1U << 6; 2001 u64 esr; 2002 if (!Aarch64GetESR(ucontext, &esr)) return Unknown; 2003 return esr & ESR_ELx_WNR ? Write : Read; 2004 #elif defined(__loongarch__) 2005 u32 flags = ucontext->uc_mcontext.__flags; 2006 if (flags & SC_ADDRERR_RD) 2007 return SignalContext::Read; 2008 if (flags & SC_ADDRERR_WR) 2009 return SignalContext::Write; 2010 return SignalContext::Unknown; 2011 #elif defined(__sparc__) 2012 // Decode the instruction to determine the access type. 2013 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 2014 #if SANITIZER_SOLARIS 2015 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 2016 #else 2017 // Historical BSDism here. 2018 struct sigcontext *scontext = (struct sigcontext *)context; 2019 #if defined(__arch64__) 2020 uptr pc = scontext->sigc_regs.tpc; 2021 #else 2022 uptr pc = scontext->si_regs.pc; 2023 #endif 2024 #endif 2025 u32 instr = *(u32 *)pc; 2026 return (instr >> 21) & 1 ? Write: Read; 2027 #elif defined(__riscv) 2028 #if SANITIZER_FREEBSD 2029 unsigned long pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc; 2030 #else 2031 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2032 #endif 2033 unsigned faulty_instruction = *(uint16_t *)pc; 2034 2035 #if defined(__riscv_compressed) 2036 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction 2037 // set op_bits to the instruction bits [1, 0, 15, 14, 13] 2038 unsigned op_bits = 2039 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13); 2040 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive 2041 switch (op_bits) { 2042 case 0b10'010: // c.lwsp (rd != x0) 2043 #if __riscv_xlen == 64 2044 case 0b10'011: // c.ldsp (rd != x0) 2045 #endif 2046 return rd ? SignalContext::Read : SignalContext::Unknown; 2047 case 0b00'010: // c.lw 2048 #if __riscv_flen >= 32 && __riscv_xlen == 32 2049 case 0b10'011: // c.flwsp 2050 #endif 2051 #if __riscv_flen >= 32 || __riscv_xlen == 64 2052 case 0b00'011: // c.flw / c.ld 2053 #endif 2054 #if __riscv_flen == 64 2055 case 0b00'001: // c.fld 2056 case 0b10'001: // c.fldsp 2057 #endif 2058 return SignalContext::Read; 2059 case 0b00'110: // c.sw 2060 case 0b10'110: // c.swsp 2061 #if __riscv_flen >= 32 || __riscv_xlen == 64 2062 case 0b00'111: // c.fsw / c.sd 2063 case 0b10'111: // c.fswsp / c.sdsp 2064 #endif 2065 #if __riscv_flen == 64 2066 case 0b00'101: // c.fsd 2067 case 0b10'101: // c.fsdsp 2068 #endif 2069 return SignalContext::Write; 2070 default: 2071 return SignalContext::Unknown; 2072 } 2073 } 2074 #endif 2075 2076 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits 2077 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive 2078 switch (opcode) { 2079 case 0b0000011: // loads 2080 switch (funct3) { 2081 case 0b000: // lb 2082 case 0b001: // lh 2083 case 0b010: // lw 2084 #if __riscv_xlen == 64 2085 case 0b011: // ld 2086 #endif 2087 case 0b100: // lbu 2088 case 0b101: // lhu 2089 return SignalContext::Read; 2090 default: 2091 return SignalContext::Unknown; 2092 } 2093 case 0b0100011: // stores 2094 switch (funct3) { 2095 case 0b000: // sb 2096 case 0b001: // sh 2097 case 0b010: // sw 2098 #if __riscv_xlen == 64 2099 case 0b011: // sd 2100 #endif 2101 return SignalContext::Write; 2102 default: 2103 return SignalContext::Unknown; 2104 } 2105 #if __riscv_flen >= 32 2106 case 0b0000111: // floating-point loads 2107 switch (funct3) { 2108 case 0b010: // flw 2109 #if __riscv_flen == 64 2110 case 0b011: // fld 2111 #endif 2112 return SignalContext::Read; 2113 default: 2114 return SignalContext::Unknown; 2115 } 2116 case 0b0100111: // floating-point stores 2117 switch (funct3) { 2118 case 0b010: // fsw 2119 #if __riscv_flen == 64 2120 case 0b011: // fsd 2121 #endif 2122 return SignalContext::Write; 2123 default: 2124 return SignalContext::Unknown; 2125 } 2126 #endif 2127 default: 2128 return SignalContext::Unknown; 2129 } 2130 #else 2131 (void)ucontext; 2132 return Unknown; // FIXME: Implement. 2133 #endif 2134 } 2135 2136 bool SignalContext::IsTrueFaultingAddress() const { 2137 auto si = static_cast<const siginfo_t *>(siginfo); 2138 // SIGSEGV signals without a true fault address have si_code set to 128. 2139 return si->si_signo == SIGSEGV && si->si_code != 128; 2140 } 2141 2142 void SignalContext::DumpAllRegisters(void *context) { 2143 // FIXME: Implement this. 2144 } 2145 2146 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 2147 #if SANITIZER_NETBSD 2148 // This covers all NetBSD architectures 2149 ucontext_t *ucontext = (ucontext_t *)context; 2150 *pc = _UC_MACHINE_PC(ucontext); 2151 *bp = _UC_MACHINE_FP(ucontext); 2152 *sp = _UC_MACHINE_SP(ucontext); 2153 #elif defined(__arm__) 2154 ucontext_t *ucontext = (ucontext_t*)context; 2155 *pc = ucontext->uc_mcontext.arm_pc; 2156 *bp = ucontext->uc_mcontext.arm_fp; 2157 *sp = ucontext->uc_mcontext.arm_sp; 2158 #elif defined(__aarch64__) 2159 # if SANITIZER_FREEBSD 2160 ucontext_t *ucontext = (ucontext_t*)context; 2161 *pc = ucontext->uc_mcontext.mc_gpregs.gp_elr; 2162 *bp = ucontext->uc_mcontext.mc_gpregs.gp_x[29]; 2163 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp; 2164 # else 2165 ucontext_t *ucontext = (ucontext_t*)context; 2166 *pc = ucontext->uc_mcontext.pc; 2167 *bp = ucontext->uc_mcontext.regs[29]; 2168 *sp = ucontext->uc_mcontext.sp; 2169 # endif 2170 #elif defined(__hppa__) 2171 ucontext_t *ucontext = (ucontext_t*)context; 2172 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 2173 /* GCC uses %r3 whenever a frame pointer is needed. */ 2174 *bp = ucontext->uc_mcontext.sc_gr[3]; 2175 *sp = ucontext->uc_mcontext.sc_gr[30]; 2176 #elif defined(__x86_64__) 2177 # if SANITIZER_FREEBSD 2178 ucontext_t *ucontext = (ucontext_t*)context; 2179 *pc = ucontext->uc_mcontext.mc_rip; 2180 *bp = ucontext->uc_mcontext.mc_rbp; 2181 *sp = ucontext->uc_mcontext.mc_rsp; 2182 # else 2183 ucontext_t *ucontext = (ucontext_t*)context; 2184 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 2185 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 2186 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 2187 # endif 2188 #elif defined(__i386__) 2189 # if SANITIZER_FREEBSD 2190 ucontext_t *ucontext = (ucontext_t*)context; 2191 *pc = ucontext->uc_mcontext.mc_eip; 2192 *bp = ucontext->uc_mcontext.mc_ebp; 2193 *sp = ucontext->uc_mcontext.mc_esp; 2194 # else 2195 ucontext_t *ucontext = (ucontext_t*)context; 2196 # if SANITIZER_SOLARIS 2197 /* Use the numeric values: the symbolic ones are undefined by llvm 2198 include/llvm/Support/Solaris.h. */ 2199 # ifndef REG_EIP 2200 # define REG_EIP 14 // REG_PC 2201 # endif 2202 # ifndef REG_EBP 2203 # define REG_EBP 6 // REG_FP 2204 # endif 2205 # ifndef REG_UESP 2206 # define REG_UESP 17 // REG_SP 2207 # endif 2208 # endif 2209 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 2210 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 2211 *sp = ucontext->uc_mcontext.gregs[REG_UESP]; 2212 # endif 2213 #elif defined(__powerpc__) || defined(__powerpc64__) 2214 # if SANITIZER_FREEBSD 2215 ucontext_t *ucontext = (ucontext_t *)context; 2216 *pc = ucontext->uc_mcontext.mc_srr0; 2217 *sp = ucontext->uc_mcontext.mc_frame[1]; 2218 *bp = ucontext->uc_mcontext.mc_frame[31]; 2219 # else 2220 ucontext_t *ucontext = (ucontext_t*)context; 2221 *pc = ucontext->uc_mcontext.regs->nip; 2222 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 2223 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 2224 // pointer, but GCC always uses r31 when we need a frame pointer. 2225 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 2226 # endif 2227 #elif defined(__sparc__) 2228 #if defined(__arch64__) || defined(__sparcv9) 2229 #define STACK_BIAS 2047 2230 #else 2231 #define STACK_BIAS 0 2232 # endif 2233 # if SANITIZER_SOLARIS 2234 ucontext_t *ucontext = (ucontext_t *)context; 2235 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 2236 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS; 2237 #else 2238 // Historical BSDism here. 2239 struct sigcontext *scontext = (struct sigcontext *)context; 2240 #if defined(__arch64__) 2241 *pc = scontext->sigc_regs.tpc; 2242 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS; 2243 #else 2244 *pc = scontext->si_regs.pc; 2245 *sp = scontext->si_regs.u_regs[14]; 2246 #endif 2247 # endif 2248 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS; 2249 #elif defined(__mips__) 2250 ucontext_t *ucontext = (ucontext_t*)context; 2251 *pc = ucontext->uc_mcontext.pc; 2252 *bp = ucontext->uc_mcontext.gregs[30]; 2253 *sp = ucontext->uc_mcontext.gregs[29]; 2254 #elif defined(__s390__) 2255 ucontext_t *ucontext = (ucontext_t*)context; 2256 # if defined(__s390x__) 2257 *pc = ucontext->uc_mcontext.psw.addr; 2258 # else 2259 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 2260 # endif 2261 *bp = ucontext->uc_mcontext.gregs[11]; 2262 *sp = ucontext->uc_mcontext.gregs[15]; 2263 #elif defined(__riscv) 2264 ucontext_t *ucontext = (ucontext_t*)context; 2265 # if SANITIZER_FREEBSD 2266 *pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc; 2267 *bp = ucontext->uc_mcontext.mc_gpregs.gp_s[0]; 2268 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp; 2269 # else 2270 *pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2271 *bp = ucontext->uc_mcontext.__gregs[REG_S0]; 2272 *sp = ucontext->uc_mcontext.__gregs[REG_SP]; 2273 # endif 2274 # elif defined(__hexagon__) 2275 ucontext_t *ucontext = (ucontext_t *)context; 2276 *pc = ucontext->uc_mcontext.pc; 2277 *bp = ucontext->uc_mcontext.r30; 2278 *sp = ucontext->uc_mcontext.r29; 2279 # elif defined(__loongarch__) 2280 ucontext_t *ucontext = (ucontext_t *)context; 2281 *pc = ucontext->uc_mcontext.__pc; 2282 *bp = ucontext->uc_mcontext.__gregs[22]; 2283 *sp = ucontext->uc_mcontext.__gregs[3]; 2284 # else 2285 # error "Unsupported arch" 2286 # endif 2287 } 2288 2289 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 2290 2291 void InitializePlatformEarly() { 2292 // Do nothing. 2293 } 2294 2295 void CheckASLR() { 2296 #if SANITIZER_NETBSD 2297 int mib[3]; 2298 int paxflags; 2299 uptr len = sizeof(paxflags); 2300 2301 mib[0] = CTL_PROC; 2302 mib[1] = internal_getpid(); 2303 mib[2] = PROC_PID_PAXFLAGS; 2304 2305 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2306 Printf("sysctl failed\n"); 2307 Die(); 2308 } 2309 2310 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2311 Printf("This sanitizer is not compatible with enabled ASLR.\n" 2312 "To disable ASLR, please run \"paxctl +a %s\" and try again.\n", 2313 GetArgv()[0]); 2314 Die(); 2315 } 2316 #elif SANITIZER_FREEBSD 2317 int aslr_status; 2318 int r = internal_procctl(P_PID, 0, PROC_ASLR_STATUS, &aslr_status); 2319 if (UNLIKELY(r == -1)) { 2320 // We're making things less 'dramatic' here since 2321 // the cmd is not necessarily guaranteed to be here 2322 // just yet regarding FreeBSD release 2323 return; 2324 } 2325 if ((aslr_status & PROC_ASLR_ACTIVE) != 0) { 2326 VReport(1, "This sanitizer is not compatible with enabled ASLR " 2327 "and binaries compiled with PIE\n" 2328 "ASLR will be disabled and the program re-executed.\n"); 2329 int aslr_ctl = PROC_ASLR_FORCE_DISABLE; 2330 CHECK_NE(internal_procctl(P_PID, 0, PROC_ASLR_CTL, &aslr_ctl), -1); 2331 ReExec(); 2332 } 2333 # elif SANITIZER_PPC64V2 2334 // Disable ASLR for Linux PPC64LE. 2335 int old_personality = personality(0xffffffff); 2336 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2337 VReport(1, 2338 "WARNING: Program is being run with address space layout " 2339 "randomization (ASLR) enabled which prevents the thread and " 2340 "memory sanitizers from working on powerpc64le.\n" 2341 "ASLR will be disabled and the program re-executed.\n"); 2342 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2343 ReExec(); 2344 } 2345 # else 2346 // Do nothing 2347 # endif 2348 } 2349 2350 void CheckMPROTECT() { 2351 #if SANITIZER_NETBSD 2352 int mib[3]; 2353 int paxflags; 2354 uptr len = sizeof(paxflags); 2355 2356 mib[0] = CTL_PROC; 2357 mib[1] = internal_getpid(); 2358 mib[2] = PROC_PID_PAXFLAGS; 2359 2360 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2361 Printf("sysctl failed\n"); 2362 Die(); 2363 } 2364 2365 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2366 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2367 Die(); 2368 } 2369 #else 2370 // Do nothing 2371 #endif 2372 } 2373 2374 void CheckNoDeepBind(const char *filename, int flag) { 2375 #ifdef RTLD_DEEPBIND 2376 if (flag & RTLD_DEEPBIND) { 2377 Report( 2378 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2379 " which is incompatible with sanitizer runtime " 2380 "(see https://github.com/google/sanitizers/issues/611 for details" 2381 "). If you want to run %s library under sanitizers please remove " 2382 "RTLD_DEEPBIND from dlopen flags.\n", 2383 filename, filename); 2384 Die(); 2385 } 2386 #endif 2387 } 2388 2389 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2390 uptr *largest_gap_found, 2391 uptr *max_occupied_addr) { 2392 UNREACHABLE("FindAvailableMemoryRange is not available"); 2393 return 0; 2394 } 2395 2396 bool GetRandom(void *buffer, uptr length, bool blocking) { 2397 if (!buffer || !length || length > 256) 2398 return false; 2399 #if SANITIZER_USE_GETENTROPY 2400 uptr rnd = getentropy(buffer, length); 2401 int rverrno = 0; 2402 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2403 return false; 2404 else if (rnd == 0) 2405 return true; 2406 #endif // SANITIZER_USE_GETENTROPY 2407 2408 #if SANITIZER_USE_GETRANDOM 2409 static atomic_uint8_t skip_getrandom_syscall; 2410 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2411 // Up to 256 bytes, getrandom will not be interrupted. 2412 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2413 blocking ? 0 : GRND_NONBLOCK); 2414 int rverrno = 0; 2415 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2416 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2417 else if (res == length) 2418 return true; 2419 } 2420 #endif // SANITIZER_USE_GETRANDOM 2421 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2422 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2423 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2424 if (internal_iserror(fd)) 2425 return false; 2426 uptr res = internal_read(fd, buffer, length); 2427 if (internal_iserror(res)) 2428 return false; 2429 internal_close(fd); 2430 return true; 2431 } 2432 2433 } // namespace __sanitizer 2434 2435 #endif 2436