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 || SANITIZER_HAIKU 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. sparc64 is similar, using 37 // syscall(__NR_stat64) and struct kernel_stat64. 38 # if SANITIZER_LINUX && (SANITIZER_MIPS64 || SANITIZER_SPARC64) 39 # include <asm/unistd.h> 40 # include <sys/types.h> 41 # define stat kernel_stat 42 # if SANITIZER_SPARC64 43 # define stat64 kernel_stat64 44 # endif 45 # if SANITIZER_GO 46 # undef st_atime 47 # undef st_mtime 48 # undef st_ctime 49 # define st_atime st_atim 50 # define st_mtime st_mtim 51 # define st_ctime st_ctim 52 # endif 53 # include <asm/stat.h> 54 # undef stat 55 # undef stat64 56 # endif 57 58 # include <dlfcn.h> 59 # include <errno.h> 60 # include <fcntl.h> 61 # include <link.h> 62 # include <pthread.h> 63 # include <sched.h> 64 # include <signal.h> 65 # include <sys/mman.h> 66 # if !SANITIZER_SOLARIS && !SANITIZER_HAIKU 67 # include <sys/ptrace.h> 68 # endif 69 # include <sys/resource.h> 70 # include <sys/stat.h> 71 # if !SANITIZER_HAIKU 72 # include <sys/syscall.h> 73 # include <ucontext.h> 74 # endif 75 # include <sys/time.h> 76 # include <sys/types.h> 77 # include <unistd.h> 78 79 # if SANITIZER_LINUX 80 # include <sys/utsname.h> 81 # endif 82 83 # if SANITIZER_LINUX && !SANITIZER_ANDROID 84 # include <sys/personality.h> 85 # endif 86 87 # if SANITIZER_ANDROID && __ANDROID_API__ < 35 88 // The weak `strerrorname_np` (introduced in API level 35) definition, 89 // allows for checking the API level at runtime. 90 extern "C" SANITIZER_WEAK_ATTRIBUTE const char *strerrorname_np(int); 91 # endif 92 93 # if SANITIZER_LINUX && defined(__loongarch__) 94 # include <sys/sysmacros.h> 95 # endif 96 97 # if SANITIZER_LINUX && defined(__powerpc64__) 98 # include <asm/ptrace.h> 99 # endif 100 101 # if SANITIZER_FREEBSD 102 # include <machine/atomic.h> 103 # include <sys/exec.h> 104 # include <sys/procctl.h> 105 # include <sys/sysctl.h> 106 extern "C" { 107 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on 108 // FreeBSD 9.2 and 10.0. 109 # include <sys/umtx.h> 110 } 111 # include <sys/thr.h> 112 # endif // SANITIZER_FREEBSD 113 114 # if SANITIZER_NETBSD 115 # include <limits.h> // For NAME_MAX 116 # include <sys/exec.h> 117 # include <sys/sysctl.h> 118 extern struct ps_strings *__ps_strings; 119 # endif // SANITIZER_NETBSD 120 121 # if SANITIZER_SOLARIS 122 # include <stddef.h> 123 # include <stdlib.h> 124 # include <sys/frame.h> 125 # include <thread.h> 126 # define environ _environ 127 # endif 128 129 # if SANITIZER_HAIKU 130 # include <OS.h> 131 # include <elf.h> 132 # include <image.h> 133 extern "C" char **__libc_argv; 134 # endif 135 136 extern char **environ; 137 138 # if SANITIZER_LINUX 139 // <linux/time.h> 140 struct kernel_timeval { 141 long tv_sec; 142 long tv_usec; 143 }; 144 145 // <linux/futex.h> is broken on some linux distributions. 146 const int FUTEX_WAIT = 0; 147 const int FUTEX_WAKE = 1; 148 const int FUTEX_PRIVATE_FLAG = 128; 149 const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; 150 const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; 151 # endif // SANITIZER_LINUX 152 153 // Are we using 32-bit or 64-bit Linux syscalls? 154 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 155 // but it still needs to use 64-bit syscalls. 156 # if SANITIZER_LINUX && \ 157 (defined(__x86_64__) || defined(__powerpc64__) || \ 158 SANITIZER_WORDSIZE == 64 || \ 159 (defined(__mips__) && defined(_ABIN32) && _MIPS_SIM == _ABIN32)) 160 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 161 # else 162 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 163 # endif 164 165 // Note : FreeBSD implemented both Linux and OpenBSD apis. 166 # if SANITIZER_LINUX && defined(__NR_getrandom) 167 # if !defined(GRND_NONBLOCK) 168 # define GRND_NONBLOCK 1 169 # endif 170 # define SANITIZER_USE_GETRANDOM 1 171 # else 172 # define SANITIZER_USE_GETRANDOM 0 173 # endif // SANITIZER_LINUX && defined(__NR_getrandom) 174 175 # if SANITIZER_FREEBSD 176 # define SANITIZER_USE_GETENTROPY 1 177 extern "C" void *__sys_mmap(void *addr, size_t len, int prot, int flags, int fd, 178 off_t offset); 179 # endif 180 181 namespace __sanitizer { 182 183 void SetSigProcMask(__sanitizer_sigset_t *set, __sanitizer_sigset_t *oldset) { 184 CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, set, oldset)); 185 } 186 187 # if SANITIZER_LINUX 188 // Deletes the specified signal from newset, if it is not present in oldset 189 // Equivalently: newset[signum] = newset[signum] & oldset[signum] 190 static void KeepUnblocked(__sanitizer_sigset_t &newset, 191 __sanitizer_sigset_t &oldset, int signum) { 192 // FIXME: https://github.com/google/sanitizers/issues/1816 193 if (SANITIZER_ANDROID || !internal_sigismember(&oldset, signum)) 194 internal_sigdelset(&newset, signum); 195 } 196 # endif 197 198 // Block asynchronous signals 199 void BlockSignals(__sanitizer_sigset_t *oldset) { 200 __sanitizer_sigset_t newset; 201 internal_sigfillset(&newset); 202 203 # if SANITIZER_LINUX 204 __sanitizer_sigset_t currentset; 205 206 # if !SANITIZER_ANDROID 207 // FIXME: https://github.com/google/sanitizers/issues/1816 208 SetSigProcMask(NULL, ¤tset); 209 210 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 211 // on any thread, setuid call hangs. 212 // See test/sanitizer_common/TestCases/Linux/setuid.c. 213 KeepUnblocked(newset, currentset, 33); 214 # endif // !SANITIZER_ANDROID 215 216 // Seccomp-BPF-sandboxed processes rely on SIGSYS to handle trapped syscalls. 217 // If this signal is blocked, such calls cannot be handled and the process may 218 // hang. 219 KeepUnblocked(newset, currentset, 31); 220 221 # if !SANITIZER_ANDROID 222 // Don't block synchronous signals 223 // but also don't unblock signals that the user had deliberately blocked. 224 // FIXME: https://github.com/google/sanitizers/issues/1816 225 KeepUnblocked(newset, currentset, SIGSEGV); 226 KeepUnblocked(newset, currentset, SIGBUS); 227 KeepUnblocked(newset, currentset, SIGILL); 228 KeepUnblocked(newset, currentset, SIGTRAP); 229 KeepUnblocked(newset, currentset, SIGABRT); 230 KeepUnblocked(newset, currentset, SIGFPE); 231 KeepUnblocked(newset, currentset, SIGPIPE); 232 # endif //! SANITIZER_ANDROID 233 234 # endif // SANITIZER_LINUX 235 236 SetSigProcMask(&newset, oldset); 237 } 238 239 ScopedBlockSignals::ScopedBlockSignals(__sanitizer_sigset_t *copy) { 240 BlockSignals(&saved_); 241 if (copy) 242 internal_memcpy(copy, &saved_, sizeof(saved_)); 243 } 244 245 ScopedBlockSignals::~ScopedBlockSignals() { SetSigProcMask(&saved_, nullptr); } 246 247 # if SANITIZER_LINUX && defined(__x86_64__) 248 # include "sanitizer_syscall_linux_x86_64.inc" 249 # elif SANITIZER_LINUX && SANITIZER_RISCV64 250 # include "sanitizer_syscall_linux_riscv64.inc" 251 # elif SANITIZER_LINUX && defined(__aarch64__) 252 # include "sanitizer_syscall_linux_aarch64.inc" 253 # elif SANITIZER_LINUX && defined(__arm__) 254 # include "sanitizer_syscall_linux_arm.inc" 255 # elif SANITIZER_LINUX && defined(__hexagon__) 256 # include "sanitizer_syscall_linux_hexagon.inc" 257 # elif SANITIZER_LINUX && SANITIZER_LOONGARCH64 258 # include "sanitizer_syscall_linux_loongarch64.inc" 259 # else 260 # include "sanitizer_syscall_generic.inc" 261 # endif 262 263 // --------------- sanitizer_libc.h 264 # if !SANITIZER_SOLARIS && !SANITIZER_NETBSD && !SANITIZER_HAIKU 265 # if !SANITIZER_S390 266 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd, 267 u64 offset) { 268 # if SANITIZER_FREEBSD 269 return (uptr)__sys_mmap(addr, length, prot, flags, fd, offset); 270 # elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 271 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd, 272 offset); 273 # else 274 // mmap2 specifies file offset in 4096-byte units. 275 CHECK(IsAligned(offset, 4096)); 276 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd, 277 (OFF_T)(offset / 4096)); 278 # endif 279 } 280 # endif // !SANITIZER_S390 281 282 uptr internal_munmap(void *addr, uptr length) { 283 return internal_syscall(SYSCALL(munmap), (uptr)addr, length); 284 } 285 286 # if SANITIZER_LINUX 287 uptr internal_mremap(void *old_address, uptr old_size, uptr new_size, int flags, 288 void *new_address) { 289 return internal_syscall(SYSCALL(mremap), (uptr)old_address, old_size, 290 new_size, flags, (uptr)new_address); 291 } 292 # endif 293 294 int internal_mprotect(void *addr, uptr length, int prot) { 295 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot); 296 } 297 298 int internal_madvise(uptr addr, uptr length, int advice) { 299 return internal_syscall(SYSCALL(madvise), addr, length, advice); 300 } 301 302 # if SANITIZER_FREEBSD 303 uptr internal_close_range(fd_t lowfd, fd_t highfd, int flags) { 304 return internal_syscall(SYSCALL(close_range), lowfd, highfd, flags); 305 } 306 # endif 307 uptr internal_close(fd_t fd) { return internal_syscall(SYSCALL(close), fd); } 308 309 uptr internal_open(const char *filename, int flags) { 310 # if SANITIZER_LINUX 311 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags); 312 # else 313 return internal_syscall(SYSCALL(open), (uptr)filename, flags); 314 # endif 315 } 316 317 uptr internal_open(const char *filename, int flags, u32 mode) { 318 # if SANITIZER_LINUX 319 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags, 320 mode); 321 # else 322 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode); 323 # endif 324 } 325 326 uptr internal_read(fd_t fd, void *buf, uptr count) { 327 sptr res; 328 HANDLE_EINTR(res, 329 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)); 330 return res; 331 } 332 333 uptr internal_write(fd_t fd, const void *buf, uptr count) { 334 sptr res; 335 HANDLE_EINTR(res, 336 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)); 337 return res; 338 } 339 340 uptr internal_ftruncate(fd_t fd, uptr size) { 341 sptr res; 342 HANDLE_EINTR(res, 343 (sptr)internal_syscall(SYSCALL(ftruncate), fd, (OFF_T)size)); 344 return res; 345 } 346 347 # if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && SANITIZER_LINUX 348 static void stat64_to_stat(struct stat64 *in, struct stat *out) { 349 internal_memset(out, 0, sizeof(*out)); 350 out->st_dev = in->st_dev; 351 out->st_ino = in->st_ino; 352 out->st_mode = in->st_mode; 353 out->st_nlink = in->st_nlink; 354 out->st_uid = in->st_uid; 355 out->st_gid = in->st_gid; 356 out->st_rdev = in->st_rdev; 357 out->st_size = in->st_size; 358 out->st_blksize = in->st_blksize; 359 out->st_blocks = in->st_blocks; 360 out->st_atime = in->st_atime; 361 out->st_mtime = in->st_mtime; 362 out->st_ctime = in->st_ctime; 363 } 364 # endif 365 366 # if SANITIZER_LINUX && defined(__loongarch__) 367 static void statx_to_stat(struct statx *in, struct stat *out) { 368 internal_memset(out, 0, sizeof(*out)); 369 out->st_dev = makedev(in->stx_dev_major, in->stx_dev_minor); 370 out->st_ino = in->stx_ino; 371 out->st_mode = in->stx_mode; 372 out->st_nlink = in->stx_nlink; 373 out->st_uid = in->stx_uid; 374 out->st_gid = in->stx_gid; 375 out->st_rdev = makedev(in->stx_rdev_major, in->stx_rdev_minor); 376 out->st_size = in->stx_size; 377 out->st_blksize = in->stx_blksize; 378 out->st_blocks = in->stx_blocks; 379 out->st_atime = in->stx_atime.tv_sec; 380 out->st_atim.tv_nsec = in->stx_atime.tv_nsec; 381 out->st_mtime = in->stx_mtime.tv_sec; 382 out->st_mtim.tv_nsec = in->stx_mtime.tv_nsec; 383 out->st_ctime = in->stx_ctime.tv_sec; 384 out->st_ctim.tv_nsec = in->stx_ctime.tv_nsec; 385 } 386 # endif 387 388 # if SANITIZER_MIPS64 || SANITIZER_SPARC64 389 # if SANITIZER_MIPS64 390 typedef struct kernel_stat kstat_t; 391 # else 392 typedef struct kernel_stat64 kstat_t; 393 # endif 394 // Undefine compatibility macros from <sys/stat.h> 395 // so that they would not clash with the kernel_stat 396 // st_[a|m|c]time fields 397 # if !SANITIZER_GO 398 # undef st_atime 399 # undef st_mtime 400 # undef st_ctime 401 # endif 402 # if defined(SANITIZER_ANDROID) 403 // Bionic sys/stat.h defines additional macros 404 // for compatibility with the old NDKs and 405 // they clash with the kernel_stat structure 406 // st_[a|m|c]time_nsec fields. 407 # undef st_atime_nsec 408 # undef st_mtime_nsec 409 # undef st_ctime_nsec 410 # endif 411 static void kernel_stat_to_stat(kstat_t *in, struct stat *out) { 412 internal_memset(out, 0, sizeof(*out)); 413 out->st_dev = in->st_dev; 414 out->st_ino = in->st_ino; 415 out->st_mode = in->st_mode; 416 out->st_nlink = in->st_nlink; 417 out->st_uid = in->st_uid; 418 out->st_gid = in->st_gid; 419 out->st_rdev = in->st_rdev; 420 out->st_size = in->st_size; 421 out->st_blksize = in->st_blksize; 422 out->st_blocks = in->st_blocks; 423 # if defined(__USE_MISC) || defined(__USE_XOPEN2K8) || \ 424 defined(SANITIZER_ANDROID) 425 out->st_atim.tv_sec = in->st_atime; 426 out->st_atim.tv_nsec = in->st_atime_nsec; 427 out->st_mtim.tv_sec = in->st_mtime; 428 out->st_mtim.tv_nsec = in->st_mtime_nsec; 429 out->st_ctim.tv_sec = in->st_ctime; 430 out->st_ctim.tv_nsec = in->st_ctime_nsec; 431 # else 432 out->st_atime = in->st_atime; 433 out->st_atimensec = in->st_atime_nsec; 434 out->st_mtime = in->st_mtime; 435 out->st_mtimensec = in->st_mtime_nsec; 436 out->st_ctime = in->st_ctime; 437 out->st_atimensec = in->st_ctime_nsec; 438 # endif 439 } 440 # endif 441 442 uptr internal_stat(const char *path, void *buf) { 443 # if SANITIZER_FREEBSD 444 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0); 445 # elif SANITIZER_LINUX 446 # if defined(__loongarch__) 447 struct statx bufx; 448 int res = internal_syscall(SYSCALL(statx), AT_FDCWD, (uptr)path, 449 AT_NO_AUTOMOUNT, STATX_BASIC_STATS, (uptr)&bufx); 450 statx_to_stat(&bufx, (struct stat *)buf); 451 return res; 452 # elif ( \ 453 SANITIZER_WORDSIZE == 64 || SANITIZER_X32 || \ 454 (defined(__mips__) && defined(_ABIN32) && _MIPS_SIM == _ABIN32)) && \ 455 !SANITIZER_SPARC 456 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 457 0); 458 # elif SANITIZER_SPARC64 459 kstat_t buf64; 460 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 461 (uptr)&buf64, 0); 462 kernel_stat_to_stat(&buf64, (struct stat *)buf); 463 return res; 464 # else 465 struct stat64 buf64; 466 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 467 (uptr)&buf64, 0); 468 stat64_to_stat(&buf64, (struct stat *)buf); 469 return res; 470 # endif 471 # else 472 struct stat64 buf64; 473 int res = internal_syscall(SYSCALL(stat64), path, &buf64); 474 stat64_to_stat(&buf64, (struct stat *)buf); 475 return res; 476 # endif 477 } 478 479 uptr internal_lstat(const char *path, void *buf) { 480 # if SANITIZER_FREEBSD 481 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 482 AT_SYMLINK_NOFOLLOW); 483 # elif SANITIZER_LINUX 484 # if defined(__loongarch__) 485 struct statx bufx; 486 int res = internal_syscall(SYSCALL(statx), AT_FDCWD, (uptr)path, 487 AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT, 488 STATX_BASIC_STATS, (uptr)&bufx); 489 statx_to_stat(&bufx, (struct stat *)buf); 490 return res; 491 # elif ( \ 492 defined(_LP64) || SANITIZER_X32 || \ 493 (defined(__mips__) && defined(_ABIN32) && _MIPS_SIM == _ABIN32)) && \ 494 !SANITIZER_SPARC 495 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 496 AT_SYMLINK_NOFOLLOW); 497 # elif SANITIZER_SPARC64 498 kstat_t buf64; 499 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 500 (uptr)&buf64, AT_SYMLINK_NOFOLLOW); 501 kernel_stat_to_stat(&buf64, (struct stat *)buf); 502 return res; 503 # else 504 struct stat64 buf64; 505 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 506 (uptr)&buf64, AT_SYMLINK_NOFOLLOW); 507 stat64_to_stat(&buf64, (struct stat *)buf); 508 return res; 509 # endif 510 # else 511 struct stat64 buf64; 512 int res = internal_syscall(SYSCALL(lstat64), path, &buf64); 513 stat64_to_stat(&buf64, (struct stat *)buf); 514 return res; 515 # endif 516 } 517 518 uptr internal_fstat(fd_t fd, void *buf) { 519 # if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 520 # if SANITIZER_MIPS64 521 // For mips64, fstat syscall fills buffer in the format of kernel_stat 522 kstat_t kbuf; 523 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf); 524 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 525 return res; 526 # elif SANITIZER_LINUX && SANITIZER_SPARC64 527 // For sparc64, fstat64 syscall fills buffer in the format of kernel_stat64 528 kstat_t kbuf; 529 int res = internal_syscall(SYSCALL(fstat64), fd, &kbuf); 530 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 531 return res; 532 # elif SANITIZER_LINUX && defined(__loongarch__) 533 struct statx bufx; 534 int res = internal_syscall(SYSCALL(statx), fd, "", AT_EMPTY_PATH, 535 STATX_BASIC_STATS, (uptr)&bufx); 536 statx_to_stat(&bufx, (struct stat *)buf); 537 return res; 538 # else 539 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf); 540 # endif 541 # else 542 struct stat64 buf64; 543 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64); 544 stat64_to_stat(&buf64, (struct stat *)buf); 545 return res; 546 # endif 547 } 548 549 uptr internal_filesize(fd_t fd) { 550 struct stat st; 551 if (internal_fstat(fd, &st)) 552 return -1; 553 return (uptr)st.st_size; 554 } 555 556 uptr internal_dup(int oldfd) { return internal_syscall(SYSCALL(dup), oldfd); } 557 558 uptr internal_dup2(int oldfd, int newfd) { 559 # if SANITIZER_LINUX 560 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0); 561 # else 562 return internal_syscall(SYSCALL(dup2), oldfd, newfd); 563 # endif 564 } 565 566 uptr internal_readlink(const char *path, char *buf, uptr bufsize) { 567 # if SANITIZER_LINUX 568 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 569 bufsize); 570 # else 571 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize); 572 # endif 573 } 574 575 uptr internal_unlink(const char *path) { 576 # if SANITIZER_LINUX 577 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0); 578 # else 579 return internal_syscall(SYSCALL(unlink), (uptr)path); 580 # endif 581 } 582 583 uptr internal_rename(const char *oldpath, const char *newpath) { 584 # if (defined(__riscv) || defined(__loongarch__)) && defined(__linux__) 585 return internal_syscall(SYSCALL(renameat2), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 586 (uptr)newpath, 0); 587 # elif SANITIZER_LINUX 588 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 589 (uptr)newpath); 590 # else 591 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath); 592 # endif 593 } 594 595 uptr internal_sched_yield() { return internal_syscall(SYSCALL(sched_yield)); } 596 597 void internal_usleep(u64 useconds) { 598 struct timespec ts; 599 ts.tv_sec = useconds / 1000000; 600 ts.tv_nsec = (useconds % 1000000) * 1000; 601 internal_syscall(SYSCALL(nanosleep), &ts, &ts); 602 } 603 604 uptr internal_execve(const char *filename, char *const argv[], 605 char *const envp[]) { 606 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, 607 (uptr)envp); 608 } 609 # endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD && !SANITIZER_HAIKU 610 611 # if !SANITIZER_NETBSD && !SANITIZER_HAIKU 612 void internal__exit(int exitcode) { 613 # if SANITIZER_FREEBSD || SANITIZER_SOLARIS 614 internal_syscall(SYSCALL(exit), exitcode); 615 # else 616 internal_syscall(SYSCALL(exit_group), exitcode); 617 # endif 618 Die(); // Unreachable. 619 } 620 # endif // !SANITIZER_NETBSD && !SANITIZER_HAIKU 621 622 // ----------------- sanitizer_common.h 623 bool FileExists(const char *filename) { 624 if (ShouldMockFailureToOpen(filename)) 625 return false; 626 struct stat st; 627 if (internal_stat(filename, &st)) 628 return false; 629 // Sanity check: filename is a regular file. 630 return S_ISREG(st.st_mode); 631 } 632 633 bool DirExists(const char *path) { 634 struct stat st; 635 if (internal_stat(path, &st)) 636 return false; 637 return S_ISDIR(st.st_mode); 638 } 639 640 # if !SANITIZER_NETBSD 641 tid_t GetTid() { 642 # if SANITIZER_FREEBSD 643 long Tid; 644 thr_self(&Tid); 645 return Tid; 646 # elif SANITIZER_SOLARIS 647 return thr_self(); 648 # elif SANITIZER_HAIKU 649 return find_thread(NULL); 650 # else 651 return internal_syscall(SYSCALL(gettid)); 652 # endif 653 } 654 655 int TgKill(pid_t pid, tid_t tid, int sig) { 656 # if SANITIZER_LINUX 657 return internal_syscall(SYSCALL(tgkill), pid, tid, sig); 658 # elif SANITIZER_FREEBSD 659 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig); 660 # elif SANITIZER_SOLARIS 661 (void)pid; 662 errno = thr_kill(tid, sig); 663 // TgKill is expected to return -1 on error, not an errno. 664 return errno != 0 ? -1 : 0; 665 # elif SANITIZER_HAIKU 666 return kill_thread(tid); 667 # endif 668 } 669 # endif 670 671 # if SANITIZER_GLIBC 672 u64 NanoTime() { 673 kernel_timeval tv; 674 internal_memset(&tv, 0, sizeof(tv)); 675 internal_syscall(SYSCALL(gettimeofday), &tv, 0); 676 return (u64)tv.tv_sec * 1000 * 1000 * 1000 + tv.tv_usec * 1000; 677 } 678 // Used by real_clock_gettime. 679 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) { 680 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp); 681 } 682 # elif !SANITIZER_SOLARIS && !SANITIZER_NETBSD 683 u64 NanoTime() { 684 struct timespec ts; 685 clock_gettime(CLOCK_REALTIME, &ts); 686 return (u64)ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec; 687 } 688 # endif 689 690 // Like getenv, but reads env directly from /proc (on Linux) or parses the 691 // 'environ' array (on some others) and does not use libc. This function 692 // should be called first inside __asan_init. 693 const char *GetEnv(const char *name) { 694 # if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_SOLARIS || \ 695 SANITIZER_HAIKU 696 if (::environ != 0) { 697 uptr NameLen = internal_strlen(name); 698 for (char **Env = ::environ; *Env != 0; Env++) { 699 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=') 700 return (*Env) + NameLen + 1; 701 } 702 } 703 return 0; // Not found. 704 # elif SANITIZER_LINUX 705 static char *environ; 706 static uptr len; 707 static bool inited; 708 if (!inited) { 709 inited = true; 710 uptr environ_size; 711 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len)) 712 environ = nullptr; 713 } 714 if (!environ || len == 0) 715 return nullptr; 716 uptr namelen = internal_strlen(name); 717 const char *p = environ; 718 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 719 // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 720 const char *endp = (char *)internal_memchr(p, '\0', len - (p - environ)); 721 if (!endp) // this entry isn't NUL terminated 722 return nullptr; 723 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 724 return p + namelen + 1; // point after = 725 p = endp + 1; 726 } 727 return nullptr; // Not found. 728 # else 729 # error "Unsupported platform" 730 # endif 731 } 732 733 # if !SANITIZER_HAIKU && !SANITIZER_FREEBSD && !SANITIZER_NETBSD && \ 734 !SANITIZER_GO 735 extern "C" { 736 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 737 } 738 # endif 739 740 # if !SANITIZER_HAIKU && !SANITIZER_FREEBSD && !SANITIZER_NETBSD 741 static void ReadNullSepFileToArray(const char *path, char ***arr, 742 int arr_size) { 743 char *buff; 744 uptr buff_size; 745 uptr buff_len; 746 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 747 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 748 (*arr)[0] = nullptr; 749 return; 750 } 751 (*arr)[0] = buff; 752 int count, i; 753 for (count = 1, i = 1;; i++) { 754 if (buff[i] == 0) { 755 if (buff[i + 1] == 0) 756 break; 757 (*arr)[count] = &buff[i + 1]; 758 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 759 count++; 760 } 761 } 762 (*arr)[count] = nullptr; 763 } 764 # endif 765 766 static void GetArgsAndEnv(char ***argv, char ***envp) { 767 # if SANITIZER_HAIKU 768 *argv = __libc_argv; 769 *envp = environ; 770 # elif SANITIZER_FREEBSD 771 // On FreeBSD, retrieving the argument and environment arrays is done via the 772 // kern.ps_strings sysctl, which returns a pointer to a structure containing 773 // this information. See also <sys/exec.h>. 774 ps_strings *pss; 775 uptr sz = sizeof(pss); 776 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 777 Printf("sysctl kern.ps_strings failed\n"); 778 Die(); 779 } 780 *argv = pss->ps_argvstr; 781 *envp = pss->ps_envstr; 782 # elif SANITIZER_NETBSD 783 *argv = __ps_strings->ps_argvstr; 784 *envp = __ps_strings->ps_envstr; 785 # else // SANITIZER_FREEBSD 786 # if !SANITIZER_GO 787 if (&__libc_stack_end) { 788 uptr *stack_end = (uptr *)__libc_stack_end; 789 // Linux/sparc64 needs an adjustment, cf. glibc 790 // sysdeps/sparc/sparc{32,64}/dl-machine.h (DL_STACK_END). 791 # if SANITIZER_LINUX && defined(__sparc__) 792 stack_end = &stack_end[16]; 793 # endif 794 // Normally argc can be obtained from *stack_end, however, on ARM glibc's 795 // _start clobbers it: 796 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/start.S;hb=refs/heads/release/2.31/master#l75 797 // Do not special-case ARM and infer argc from argv everywhere. 798 int argc = 0; 799 while (stack_end[argc + 1]) argc++; 800 *argv = (char **)(stack_end + 1); 801 *envp = (char **)(stack_end + argc + 2); 802 } else { 803 # endif // !SANITIZER_GO 804 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 805 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 806 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 807 # if !SANITIZER_GO 808 } 809 # endif // !SANITIZER_GO 810 # endif // SANITIZER_HAIKU 811 } 812 813 char **GetArgv() { 814 char **argv, **envp; 815 GetArgsAndEnv(&argv, &envp); 816 return argv; 817 } 818 819 char **GetEnviron() { 820 char **argv, **envp; 821 GetArgsAndEnv(&argv, &envp); 822 return envp; 823 } 824 825 # if !SANITIZER_SOLARIS 826 void FutexWait(atomic_uint32_t *p, u32 cmp) { 827 # if SANITIZER_FREEBSD 828 _umtx_op(p, UMTX_OP_WAIT_UINT, cmp, 0, 0); 829 # elif SANITIZER_NETBSD || SANITIZER_HAIKU 830 sched_yield(); /* No userspace futex-like synchronization */ 831 # else 832 internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAIT_PRIVATE, cmp, 0, 0, 0); 833 # endif 834 } 835 836 void FutexWake(atomic_uint32_t *p, u32 count) { 837 # if SANITIZER_FREEBSD 838 _umtx_op(p, UMTX_OP_WAKE, count, 0, 0); 839 # elif SANITIZER_NETBSD || SANITIZER_HAIKU 840 /* No userspace futex-like synchronization */ 841 # else 842 internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAKE_PRIVATE, count, 0, 0, 0); 843 # endif 844 } 845 846 # endif // !SANITIZER_SOLARIS 847 848 // ----------------- sanitizer_linux.h 849 // The actual size of this structure is specified by d_reclen. 850 // Note that getdents64 uses a different structure format. We only provide the 851 // 32-bit syscall here. 852 # if SANITIZER_NETBSD 853 // Not used 854 # else 855 struct linux_dirent { 856 # if SANITIZER_X32 || SANITIZER_LINUX 857 u64 d_ino; 858 u64 d_off; 859 # else 860 unsigned long d_ino; 861 unsigned long d_off; 862 # endif 863 unsigned short d_reclen; 864 # if SANITIZER_LINUX 865 unsigned char d_type; 866 # endif 867 char d_name[256]; 868 }; 869 # endif 870 871 # if !SANITIZER_SOLARIS && !SANITIZER_NETBSD && !SANITIZER_HAIKU 872 // Syscall wrappers. 873 uptr internal_ptrace(int request, int pid, void *addr, void *data) { 874 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 875 (uptr)data); 876 } 877 878 uptr internal_waitpid(int pid, int *status, int options) { 879 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 880 0 /* rusage */); 881 } 882 883 uptr internal_getpid() { return internal_syscall(SYSCALL(getpid)); } 884 885 uptr internal_getppid() { return internal_syscall(SYSCALL(getppid)); } 886 887 int internal_dlinfo(void *handle, int request, void *p) { 888 # if SANITIZER_FREEBSD 889 return dlinfo(handle, request, p); 890 # else 891 UNIMPLEMENTED(); 892 # endif 893 } 894 895 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 896 # if SANITIZER_FREEBSD 897 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 898 # elif SANITIZER_LINUX 899 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 900 # else 901 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 902 # endif 903 } 904 905 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 906 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 907 } 908 909 # if SANITIZER_LINUX 910 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 911 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 912 } 913 # if defined(__x86_64__) 914 # include <asm/unistd_64.h> 915 // Currently internal_arch_prctl() is only needed on x86_64. 916 uptr internal_arch_prctl(int option, uptr arg2) { 917 return internal_syscall(__NR_arch_prctl, option, arg2); 918 } 919 # endif 920 # endif 921 922 uptr internal_sigaltstack(const void *ss, void *oss) { 923 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 924 } 925 926 extern "C" pid_t __fork(void); 927 928 int internal_fork() { 929 # if SANITIZER_LINUX 930 # if SANITIZER_S390 931 return internal_syscall(SYSCALL(clone), 0, SIGCHLD); 932 # elif SANITIZER_SPARC 933 // The clone syscall interface on SPARC differs massively from the rest, 934 // so fall back to __fork. 935 return __fork(); 936 # else 937 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 938 # endif 939 # else 940 return internal_syscall(SYSCALL(fork)); 941 # endif 942 } 943 944 # if SANITIZER_FREEBSD 945 int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 946 uptr *oldlenp, const void *newp, uptr newlen) { 947 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 948 (size_t *)oldlenp, newp, (size_t)newlen); 949 } 950 951 int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 952 const void *newp, uptr newlen) { 953 // Note: this function can be called during startup, so we need to avoid 954 // calling any interceptable functions. On FreeBSD >= 1300045 sysctlbyname() 955 // is a real syscall, but for older versions it calls sysctlnametomib() 956 // followed by sysctl(). To avoid calling the intercepted version and 957 // asserting if this happens during startup, call the real sysctlnametomib() 958 // followed by internal_sysctl() if the syscall is not available. 959 # ifdef SYS___sysctlbyname 960 return internal_syscall(SYSCALL(__sysctlbyname), sname, 961 internal_strlen(sname), oldp, (size_t *)oldlenp, newp, 962 (size_t)newlen); 963 # else 964 static decltype(sysctlnametomib) *real_sysctlnametomib = nullptr; 965 if (!real_sysctlnametomib) 966 real_sysctlnametomib = 967 (decltype(sysctlnametomib) *)dlsym(RTLD_NEXT, "sysctlnametomib"); 968 CHECK(real_sysctlnametomib); 969 970 int oid[CTL_MAXNAME]; 971 size_t len = CTL_MAXNAME; 972 if (real_sysctlnametomib(sname, oid, &len) == -1) 973 return (-1); 974 return internal_sysctl(oid, len, oldp, oldlenp, newp, newlen); 975 # endif 976 } 977 # endif 978 979 # if SANITIZER_LINUX 980 # define SA_RESTORER 0x04000000 981 // Doesn't set sa_restorer if the caller did not set it, so use with caution 982 //(see below). 983 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 984 __sanitizer_kernel_sigaction_t k_act, k_oldact; 985 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 986 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 987 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 988 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 989 if (u_act) { 990 k_act.handler = u_act->handler; 991 k_act.sigaction = u_act->sigaction; 992 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 993 sizeof(__sanitizer_kernel_sigset_t)); 994 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 995 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 996 // FIXME: most often sa_restorer is unset, however the kernel requires it 997 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 998 // If sa_restorer passed to the kernel is NULL, the program may crash upon 999 // signal delivery or fail to unwind the stack in the signal handler. 1000 // libc implementation of sigaction() passes its own restorer to 1001 // rt_sigaction, so we need to do the same (we'll need to reimplement the 1002 // restorers; for x86_64 the restorer address can be obtained from 1003 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 1004 # if !SANITIZER_ANDROID || !SANITIZER_MIPS32 1005 k_act.sa_restorer = u_act->sa_restorer; 1006 # endif 1007 } 1008 1009 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 1010 (uptr)(u_act ? &k_act : nullptr), 1011 (uptr)(u_oldact ? &k_oldact : nullptr), 1012 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 1013 1014 if ((result == 0) && u_oldact) { 1015 u_oldact->handler = k_oldact.handler; 1016 u_oldact->sigaction = k_oldact.sigaction; 1017 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 1018 sizeof(__sanitizer_kernel_sigset_t)); 1019 u_oldact->sa_flags = k_oldact.sa_flags; 1020 # if !SANITIZER_ANDROID || !SANITIZER_MIPS32 1021 u_oldact->sa_restorer = k_oldact.sa_restorer; 1022 # endif 1023 } 1024 return result; 1025 } 1026 # endif // SANITIZER_LINUX 1027 1028 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 1029 __sanitizer_sigset_t *oldset) { 1030 # if SANITIZER_FREEBSD 1031 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 1032 # else 1033 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 1034 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 1035 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, (uptr)k_set, 1036 (uptr)k_oldset, sizeof(__sanitizer_kernel_sigset_t)); 1037 # endif 1038 } 1039 1040 void internal_sigfillset(__sanitizer_sigset_t *set) { 1041 internal_memset(set, 0xff, sizeof(*set)); 1042 } 1043 1044 void internal_sigemptyset(__sanitizer_sigset_t *set) { 1045 internal_memset(set, 0, sizeof(*set)); 1046 } 1047 1048 # if SANITIZER_LINUX 1049 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 1050 signum -= 1; 1051 CHECK_GE(signum, 0); 1052 CHECK_LT(signum, sizeof(*set) * 8); 1053 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 1054 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 1055 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 1056 k_set->sig[idx] &= ~((uptr)1 << bit); 1057 } 1058 1059 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 1060 signum -= 1; 1061 CHECK_GE(signum, 0); 1062 CHECK_LT(signum, sizeof(*set) * 8); 1063 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 1064 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 1065 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 1066 return k_set->sig[idx] & ((uptr)1 << bit); 1067 } 1068 # elif SANITIZER_FREEBSD 1069 uptr internal_procctl(int type, int id, int cmd, void *data) { 1070 return internal_syscall(SYSCALL(procctl), type, id, cmd, data); 1071 } 1072 1073 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 1074 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 1075 sigdelset(rset, signum); 1076 } 1077 1078 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 1079 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 1080 return sigismember(rset, signum); 1081 } 1082 # endif 1083 # endif // !SANITIZER_SOLARIS 1084 1085 # if !SANITIZER_NETBSD && !SANITIZER_HAIKU 1086 // ThreadLister implementation. 1087 ThreadLister::ThreadLister(pid_t pid) : buffer_(4096) { 1088 task_path_.AppendF("/proc/%d/task", pid); 1089 } 1090 1091 ThreadLister::Result ThreadLister::ListThreads( 1092 InternalMmapVector<tid_t> *threads) { 1093 int descriptor = internal_open(task_path_.data(), O_RDONLY | O_DIRECTORY); 1094 if (internal_iserror(descriptor)) { 1095 Report("Can't open %s for reading.\n", task_path_.data()); 1096 return Error; 1097 } 1098 auto cleanup = at_scope_exit([&] { internal_close(descriptor); }); 1099 threads->clear(); 1100 1101 Result result = Ok; 1102 for (bool first_read = true;; first_read = false) { 1103 CHECK_GE(buffer_.size(), 4096); 1104 uptr read = internal_getdents( 1105 descriptor, (struct linux_dirent *)buffer_.data(), buffer_.size()); 1106 if (!read) 1107 return result; 1108 if (internal_iserror(read)) { 1109 Report("Can't read directory entries from %s.\n", task_path_.data()); 1110 return Error; 1111 } 1112 1113 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 1114 struct linux_dirent *entry = (struct linux_dirent *)begin; 1115 begin += entry->d_reclen; 1116 if (entry->d_ino == 1) { 1117 // Inode 1 is for bad blocks and also can be a reason for early return. 1118 // Should be emitted if kernel tried to output terminating thread. 1119 // See proc_task_readdir implementation in Linux. 1120 result = Incomplete; 1121 } 1122 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 1123 threads->push_back(internal_atoll(entry->d_name)); 1124 } 1125 1126 // Now we are going to detect short-read or early EOF. In such cases Linux 1127 // can return inconsistent list with missing alive threads. 1128 // Code will just remember that the list can be incomplete but it will 1129 // continue reads to return as much as possible. 1130 if (!first_read) { 1131 // The first one was a short-read by definition. 1132 result = Incomplete; 1133 } else if (read > buffer_.size() - 1024) { 1134 // Read was close to the buffer size. So double the size and assume the 1135 // worst. 1136 buffer_.resize(buffer_.size() * 2); 1137 result = Incomplete; 1138 } else if (!threads->empty() && !IsAlive(threads->back())) { 1139 // Maybe Linux early returned from read on terminated thread (!pid_alive) 1140 // and failed to restore read position. 1141 // See next_tid and proc_task_instantiate in Linux. 1142 result = Incomplete; 1143 } 1144 } 1145 } 1146 1147 const char *ThreadLister::LoadStatus(tid_t tid) { 1148 status_path_.clear(); 1149 status_path_.AppendF("%s/%llu/status", task_path_.data(), tid); 1150 auto cleanup = at_scope_exit([&] { 1151 // Resize back to capacity if it is downsized by `ReadFileToVector`. 1152 buffer_.resize(buffer_.capacity()); 1153 }); 1154 if (!ReadFileToVector(status_path_.data(), &buffer_) || buffer_.empty()) 1155 return nullptr; 1156 buffer_.push_back('\0'); 1157 return buffer_.data(); 1158 } 1159 1160 bool ThreadLister::IsAlive(tid_t tid) { 1161 // /proc/%d/task/%d/status uses same call to detect alive threads as 1162 // proc_task_readdir. See task_state implementation in Linux. 1163 static const char kPrefix[] = "\nPPid:"; 1164 const char *status = LoadStatus(tid); 1165 if (!status) 1166 return false; 1167 const char *field = internal_strstr(status, kPrefix); 1168 if (!field) 1169 return false; 1170 field += internal_strlen(kPrefix); 1171 return (int)internal_atoll(field) != 0; 1172 } 1173 1174 # endif 1175 1176 # if SANITIZER_WORDSIZE == 32 1177 // Take care of unusable kernel area in top gigabyte. 1178 static uptr GetKernelAreaSize() { 1179 # if SANITIZER_LINUX && !SANITIZER_X32 1180 const uptr gbyte = 1UL << 30; 1181 1182 // Firstly check if there are writable segments 1183 // mapped to top gigabyte (e.g. stack). 1184 MemoryMappingLayout proc_maps(/*cache_enabled*/ true); 1185 if (proc_maps.Error()) 1186 return 0; 1187 MemoryMappedSegment segment; 1188 while (proc_maps.Next(&segment)) { 1189 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) 1190 return 0; 1191 } 1192 1193 # if !SANITIZER_ANDROID 1194 // Even if nothing is mapped, top Gb may still be accessible 1195 // if we are running on 64-bit kernel. 1196 // Uname may report misleading results if personality type 1197 // is modified (e.g. under schroot) so check this as well. 1198 struct utsname uname_info; 1199 int pers = personality(0xffffffffUL); 1200 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 && 1201 internal_strstr(uname_info.machine, "64")) 1202 return 0; 1203 # endif // SANITIZER_ANDROID 1204 1205 // Top gigabyte is reserved for kernel. 1206 return gbyte; 1207 # else 1208 return 0; 1209 # endif // SANITIZER_LINUX && !SANITIZER_X32 1210 } 1211 # endif // SANITIZER_WORDSIZE == 32 1212 1213 uptr GetMaxVirtualAddress() { 1214 # if SANITIZER_NETBSD && defined(__x86_64__) 1215 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE) 1216 # elif SANITIZER_WORDSIZE == 64 1217 # if defined(__powerpc64__) || defined(__aarch64__) || \ 1218 defined(__loongarch__) || SANITIZER_RISCV64 1219 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 1220 // We somehow need to figure out which one we are using now and choose 1221 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 1222 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 1223 // of the address space, so simply checking the stack address is not enough. 1224 // This should (does) work for both PowerPC64 Endian modes. 1225 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit. 1226 // loongarch64 also has multiple address space layouts: default is 47-bit. 1227 // RISC-V 64 also has multiple address space layouts: 39, 48 and 57-bit. 1228 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1; 1229 # elif SANITIZER_MIPS64 1230 return (1ULL << 40) - 1; // 0x000000ffffffffffUL; 1231 # elif defined(__s390x__) 1232 return (1ULL << 53) - 1; // 0x001fffffffffffffUL; 1233 # elif defined(__sparc__) 1234 return ~(uptr)0; 1235 # else 1236 return (1ULL << 47) - 1; // 0x00007fffffffffffUL; 1237 # endif 1238 # else // SANITIZER_WORDSIZE == 32 1239 # if defined(__s390__) 1240 return (1ULL << 31) - 1; // 0x7fffffff; 1241 # else 1242 return (1ULL << 32) - 1; // 0xffffffff; 1243 # endif 1244 # endif // SANITIZER_WORDSIZE 1245 } 1246 1247 uptr GetMaxUserVirtualAddress() { 1248 uptr addr = GetMaxVirtualAddress(); 1249 # if SANITIZER_WORDSIZE == 32 && !defined(__s390__) 1250 if (!common_flags()->full_address_space) 1251 addr -= GetKernelAreaSize(); 1252 CHECK_LT(reinterpret_cast<uptr>(&addr), addr); 1253 # endif 1254 return addr; 1255 } 1256 1257 # if !SANITIZER_ANDROID || defined(__aarch64__) 1258 uptr GetPageSize() { 1259 # if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) && \ 1260 defined(EXEC_PAGESIZE) 1261 return EXEC_PAGESIZE; 1262 # elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1263 // Use sysctl as sysconf can trigger interceptors internally. 1264 int pz = 0; 1265 uptr pzl = sizeof(pz); 1266 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1267 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1268 CHECK_EQ(rv, 0); 1269 return (uptr)pz; 1270 # elif SANITIZER_USE_GETAUXVAL 1271 # if SANITIZER_ANDROID && __ANDROID_API__ < 35 1272 // The 16 KB page size was introduced in Android 15 (API level 35), while 1273 // earlier versions of Android always used a 4 KB page size. 1274 // We are checking the weak definition of `strerrorname_np` (introduced in API 1275 // level 35) because some earlier API levels crashed when 1276 // `getauxval(AT_PAGESZ)` was called from the `.preinit_array`. 1277 if (!strerrorname_np) 1278 return 4096; 1279 # endif 1280 1281 return getauxval(AT_PAGESZ); 1282 # else 1283 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1284 # endif 1285 } 1286 # endif 1287 1288 uptr ReadBinaryName(/*out*/ char *buf, uptr buf_len) { 1289 # if SANITIZER_HAIKU 1290 int32_t cookie = 0; 1291 image_info info; 1292 const char *argv0 = "<UNKNOWN>"; 1293 while (get_next_image_info(B_CURRENT_TEAM, &cookie, &info) == B_OK) { 1294 if (info.type != B_APP_IMAGE) 1295 continue; 1296 argv0 = info.name; 1297 break; 1298 } 1299 internal_strncpy(buf, argv0, buf_len); 1300 return internal_strlen(buf); 1301 # elif SANITIZER_SOLARIS 1302 const char *default_module_name = getexecname(); 1303 CHECK_NE(default_module_name, NULL); 1304 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1305 # else 1306 # if SANITIZER_FREEBSD || SANITIZER_NETBSD 1307 # if SANITIZER_FREEBSD 1308 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1309 # else 1310 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1311 # endif 1312 const char *default_module_name = "kern.proc.pathname"; 1313 uptr Size = buf_len; 1314 bool IsErr = 1315 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1316 int readlink_error = IsErr ? errno : 0; 1317 uptr module_name_len = Size; 1318 # else 1319 const char *default_module_name = "/proc/self/exe"; 1320 uptr module_name_len = internal_readlink(default_module_name, buf, buf_len); 1321 int readlink_error; 1322 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1323 # endif 1324 if (IsErr) { 1325 // We can't read binary name for some reason, assume it's unknown. 1326 Report( 1327 "WARNING: reading executable name failed with errno %d, " 1328 "some stack frames may not be symbolized\n", 1329 readlink_error); 1330 module_name_len = 1331 internal_snprintf(buf, buf_len, "%s", default_module_name); 1332 CHECK_LT(module_name_len, buf_len); 1333 } 1334 return module_name_len; 1335 # endif 1336 } 1337 1338 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1339 # if SANITIZER_LINUX 1340 char *tmpbuf; 1341 uptr tmpsize; 1342 uptr tmplen; 1343 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1344 1024 * 1024)) { 1345 internal_strncpy(buf, tmpbuf, buf_len); 1346 UnmapOrDie(tmpbuf, tmpsize); 1347 return internal_strlen(buf); 1348 } 1349 # endif 1350 return ReadBinaryName(buf, buf_len); 1351 } 1352 1353 // Match full names of the form /path/to/base_name{-,.}* 1354 bool LibraryNameIs(const char *full_name, const char *base_name) { 1355 const char *name = full_name; 1356 // Strip path. 1357 while (*name != '\0') name++; 1358 while (name > full_name && *name != '/') name--; 1359 if (*name == '/') 1360 name++; 1361 uptr base_name_length = internal_strlen(base_name); 1362 if (internal_strncmp(name, base_name, base_name_length)) 1363 return false; 1364 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1365 } 1366 1367 # if !SANITIZER_ANDROID && !SANITIZER_HAIKU 1368 // Call cb for each region mapped by map. 1369 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1370 CHECK_NE(map, nullptr); 1371 # if !SANITIZER_FREEBSD && !SANITIZER_HAIKU 1372 typedef ElfW(Phdr) Elf_Phdr; 1373 typedef ElfW(Ehdr) Elf_Ehdr; 1374 # endif // !SANITIZER_FREEBSD 1375 char *base = (char *)map->l_addr; 1376 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1377 char *phdrs = base + ehdr->e_phoff; 1378 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1379 1380 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1381 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1382 // objects have a non-zero base. 1383 uptr preferred_base = (uptr)-1; 1384 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1385 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1386 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1387 preferred_base = (uptr)phdr->p_vaddr; 1388 } 1389 1390 // Compute the delta from the real base to get a relocation delta. 1391 sptr delta = (uptr)base - preferred_base; 1392 // Now we can figure out what the loader really mapped. 1393 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1394 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1395 if (phdr->p_type == PT_LOAD) { 1396 uptr seg_start = phdr->p_vaddr + delta; 1397 uptr seg_end = seg_start + phdr->p_memsz; 1398 // None of these values are aligned. We consider the ragged edges of the 1399 // load command as defined, since they are mapped from the file. 1400 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1401 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1402 cb((void *)seg_start, seg_end - seg_start); 1403 } 1404 } 1405 } 1406 # endif 1407 1408 # if SANITIZER_LINUX 1409 # if defined(__x86_64__) 1410 // We cannot use glibc's clone wrapper, because it messes with the child 1411 // task's TLS. It writes the PID and TID of the child task to its thread 1412 // descriptor, but in our case the child task shares the thread descriptor with 1413 // the parent (because we don't know how to allocate a new thread 1414 // descriptor to keep glibc happy). So the stock version of clone(), when 1415 // used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1416 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1417 int *parent_tidptr, void *newtls, int *child_tidptr) { 1418 long long res; 1419 if (!fn || !child_stack) 1420 return -EINVAL; 1421 CHECK_EQ(0, (uptr)child_stack % 16); 1422 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1423 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1424 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1425 register void *r8 __asm__("r8") = newtls; 1426 register int *r10 __asm__("r10") = child_tidptr; 1427 __asm__ __volatile__( 1428 /* %rax = syscall(%rax = SYSCALL(clone), 1429 * %rdi = flags, 1430 * %rsi = child_stack, 1431 * %rdx = parent_tidptr, 1432 * %r8 = new_tls, 1433 * %r10 = child_tidptr) 1434 */ 1435 "syscall\n" 1436 1437 /* if (%rax != 0) 1438 * return; 1439 */ 1440 "testq %%rax,%%rax\n" 1441 "jnz 1f\n" 1442 1443 /* In the child. Terminate unwind chain. */ 1444 // XXX: We should also terminate the CFI unwind chain 1445 // here. Unfortunately clang 3.2 doesn't support the 1446 // necessary CFI directives, so we skip that part. 1447 "xorq %%rbp,%%rbp\n" 1448 1449 /* Call "fn(arg)". */ 1450 "popq %%rax\n" 1451 "popq %%rdi\n" 1452 "call *%%rax\n" 1453 1454 /* Call _exit(%rax). */ 1455 "movq %%rax,%%rdi\n" 1456 "movq %2,%%rax\n" 1457 "syscall\n" 1458 1459 /* Return to parent. */ 1460 "1:\n" 1461 : "=a"(res) 1462 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), "S"(child_stack), "D"(flags), 1463 "d"(parent_tidptr), "r"(r8), "r"(r10) 1464 : "memory", "r11", "rcx"); 1465 return res; 1466 } 1467 # elif defined(__mips__) 1468 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1469 int *parent_tidptr, void *newtls, int *child_tidptr) { 1470 long long res; 1471 if (!fn || !child_stack) 1472 return -EINVAL; 1473 CHECK_EQ(0, (uptr)child_stack % 16); 1474 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1475 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1476 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1477 register void *a3 __asm__("$7") = newtls; 1478 register int *a4 __asm__("$8") = child_tidptr; 1479 // We don't have proper CFI directives here because it requires alot of code 1480 // for very marginal benefits. 1481 __asm__ __volatile__( 1482 /* $v0 = syscall($v0 = __NR_clone, 1483 * $a0 = flags, 1484 * $a1 = child_stack, 1485 * $a2 = parent_tidptr, 1486 * $a3 = new_tls, 1487 * $a4 = child_tidptr) 1488 */ 1489 ".cprestore 16;\n" 1490 "move $4,%1;\n" 1491 "move $5,%2;\n" 1492 "move $6,%3;\n" 1493 "move $7,%4;\n" 1494 /* Store the fifth argument on stack 1495 * if we are using 32-bit abi. 1496 */ 1497 # if SANITIZER_WORDSIZE == 32 1498 "lw %5,16($29);\n" 1499 # else 1500 "move $8,%5;\n" 1501 # endif 1502 "li $2,%6;\n" 1503 "syscall;\n" 1504 1505 /* if ($v0 != 0) 1506 * return; 1507 */ 1508 "bnez $2,1f;\n" 1509 1510 /* Call "fn(arg)". */ 1511 # if SANITIZER_WORDSIZE == 32 1512 # ifdef __BIG_ENDIAN__ 1513 "lw $25,4($29);\n" 1514 "lw $4,12($29);\n" 1515 # else 1516 "lw $25,0($29);\n" 1517 "lw $4,8($29);\n" 1518 # endif 1519 # else 1520 "ld $25,0($29);\n" 1521 "ld $4,8($29);\n" 1522 # endif 1523 "jal $25;\n" 1524 1525 /* Call _exit($v0). */ 1526 "move $4,$2;\n" 1527 "li $2,%7;\n" 1528 "syscall;\n" 1529 1530 /* Return to parent. */ 1531 "1:\n" 1532 : "=r"(res) 1533 : "r"(flags), "r"(child_stack), "r"(parent_tidptr), "r"(a3), "r"(a4), 1534 "i"(__NR_clone), "i"(__NR_exit) 1535 : "memory", "$29"); 1536 return res; 1537 } 1538 # elif SANITIZER_RISCV64 1539 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1540 int *parent_tidptr, void *newtls, int *child_tidptr) { 1541 if (!fn || !child_stack) 1542 return -EINVAL; 1543 1544 CHECK_EQ(0, (uptr)child_stack % 16); 1545 1546 register int res __asm__("a0"); 1547 register int __flags __asm__("a0") = flags; 1548 register void *__stack __asm__("a1") = child_stack; 1549 register int *__ptid __asm__("a2") = parent_tidptr; 1550 register void *__tls __asm__("a3") = newtls; 1551 register int *__ctid __asm__("a4") = child_tidptr; 1552 register int (*__fn)(void *) __asm__("a5") = fn; 1553 register void *__arg __asm__("a6") = arg; 1554 register int nr_clone __asm__("a7") = __NR_clone; 1555 1556 __asm__ __volatile__( 1557 "ecall\n" 1558 1559 /* if (a0 != 0) 1560 * return a0; 1561 */ 1562 "bnez a0, 1f\n" 1563 1564 // In the child, now. Call "fn(arg)". 1565 "mv a0, a6\n" 1566 "jalr a5\n" 1567 1568 // Call _exit(a0). 1569 "addi a7, zero, %9\n" 1570 "ecall\n" 1571 "1:\n" 1572 1573 : "=r"(res) 1574 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__tls), "r"(__ctid), 1575 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit) 1576 : "memory"); 1577 return res; 1578 } 1579 # elif defined(__aarch64__) 1580 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1581 int *parent_tidptr, void *newtls, int *child_tidptr) { 1582 register long long res __asm__("x0"); 1583 if (!fn || !child_stack) 1584 return -EINVAL; 1585 CHECK_EQ(0, (uptr)child_stack % 16); 1586 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1587 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1588 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1589 1590 register int (*__fn)(void *) __asm__("x0") = fn; 1591 register void *__stack __asm__("x1") = child_stack; 1592 register int __flags __asm__("x2") = flags; 1593 register void *__arg __asm__("x3") = arg; 1594 register int *__ptid __asm__("x4") = parent_tidptr; 1595 register void *__tls __asm__("x5") = newtls; 1596 register int *__ctid __asm__("x6") = child_tidptr; 1597 1598 __asm__ __volatile__( 1599 "mov x0,x2\n" /* flags */ 1600 "mov x2,x4\n" /* ptid */ 1601 "mov x3,x5\n" /* tls */ 1602 "mov x4,x6\n" /* ctid */ 1603 "mov x8,%9\n" /* clone */ 1604 1605 "svc 0x0\n" 1606 1607 /* if (%r0 != 0) 1608 * return %r0; 1609 */ 1610 "cmp x0, #0\n" 1611 "bne 1f\n" 1612 1613 /* In the child, now. Call "fn(arg)". */ 1614 "ldp x1, x0, [sp], #16\n" 1615 "blr x1\n" 1616 1617 /* Call _exit(%r0). */ 1618 "mov x8, %10\n" 1619 "svc 0x0\n" 1620 "1:\n" 1621 1622 : "=r"(res) 1623 : "i"(-EINVAL), "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1624 "r"(__ptid), "r"(__tls), "r"(__ctid), "i"(__NR_clone), "i"(__NR_exit) 1625 : "x30", "memory"); 1626 return res; 1627 } 1628 # elif SANITIZER_LOONGARCH64 1629 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1630 int *parent_tidptr, void *newtls, int *child_tidptr) { 1631 if (!fn || !child_stack) 1632 return -EINVAL; 1633 1634 CHECK_EQ(0, (uptr)child_stack % 16); 1635 1636 register int res __asm__("$a0"); 1637 register int __flags __asm__("$a0") = flags; 1638 register void *__stack __asm__("$a1") = child_stack; 1639 register int *__ptid __asm__("$a2") = parent_tidptr; 1640 register int *__ctid __asm__("$a3") = child_tidptr; 1641 register void *__tls __asm__("$a4") = newtls; 1642 register int (*__fn)(void *) __asm__("$a5") = fn; 1643 register void *__arg __asm__("$a6") = arg; 1644 register int nr_clone __asm__("$a7") = __NR_clone; 1645 1646 __asm__ __volatile__( 1647 "syscall 0\n" 1648 1649 // if ($a0 != 0) 1650 // return $a0; 1651 "bnez $a0, 1f\n" 1652 1653 // In the child, now. Call "fn(arg)". 1654 "move $a0, $a6\n" 1655 "jirl $ra, $a5, 0\n" 1656 1657 // Call _exit($a0). 1658 "addi.d $a7, $zero, %9\n" 1659 "syscall 0\n" 1660 1661 "1:\n" 1662 1663 : "=r"(res) 1664 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__ctid), "r"(__tls), 1665 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit) 1666 : "memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", 1667 "$t8"); 1668 return res; 1669 } 1670 # elif defined(__powerpc64__) 1671 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1672 int *parent_tidptr, void *newtls, int *child_tidptr) { 1673 long long res; 1674 // Stack frame structure. 1675 # if SANITIZER_PPC64V1 1676 // Back chain == 0 (SP + 112) 1677 // Frame (112 bytes): 1678 // Parameter save area (SP + 48), 8 doublewords 1679 // TOC save area (SP + 40) 1680 // Link editor doubleword (SP + 32) 1681 // Compiler doubleword (SP + 24) 1682 // LR save area (SP + 16) 1683 // CR save area (SP + 8) 1684 // Back chain (SP + 0) 1685 # define FRAME_SIZE 112 1686 # define FRAME_TOC_SAVE_OFFSET 40 1687 # elif SANITIZER_PPC64V2 1688 // Back chain == 0 (SP + 32) 1689 // Frame (32 bytes): 1690 // TOC save area (SP + 24) 1691 // LR save area (SP + 16) 1692 // CR save area (SP + 8) 1693 // Back chain (SP + 0) 1694 # define FRAME_SIZE 32 1695 # define FRAME_TOC_SAVE_OFFSET 24 1696 # else 1697 # error "Unsupported PPC64 ABI" 1698 # endif 1699 if (!fn || !child_stack) 1700 return -EINVAL; 1701 CHECK_EQ(0, (uptr)child_stack % 16); 1702 1703 register int (*__fn)(void *) __asm__("r3") = fn; 1704 register void *__cstack __asm__("r4") = child_stack; 1705 register int __flags __asm__("r5") = flags; 1706 register void *__arg __asm__("r6") = arg; 1707 register int *__ptidptr __asm__("r7") = parent_tidptr; 1708 register void *__newtls __asm__("r8") = newtls; 1709 register int *__ctidptr __asm__("r9") = child_tidptr; 1710 1711 __asm__ __volatile__( 1712 /* fn and arg are saved across the syscall */ 1713 "mr 28, %5\n\t" 1714 "mr 27, %8\n\t" 1715 1716 /* syscall 1717 r0 == __NR_clone 1718 r3 == flags 1719 r4 == child_stack 1720 r5 == parent_tidptr 1721 r6 == newtls 1722 r7 == child_tidptr */ 1723 "mr 3, %7\n\t" 1724 "mr 5, %9\n\t" 1725 "mr 6, %10\n\t" 1726 "mr 7, %11\n\t" 1727 "li 0, %3\n\t" 1728 "sc\n\t" 1729 1730 /* Test if syscall was successful */ 1731 "cmpdi cr1, 3, 0\n\t" 1732 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1733 "bne- cr1, 1f\n\t" 1734 1735 /* Set up stack frame */ 1736 "li 29, 0\n\t" 1737 "stdu 29, -8(1)\n\t" 1738 "stdu 1, -%12(1)\n\t" 1739 /* Do the function call */ 1740 "std 2, %13(1)\n\t" 1741 # if SANITIZER_PPC64V1 1742 "ld 0, 0(28)\n\t" 1743 "ld 2, 8(28)\n\t" 1744 "mtctr 0\n\t" 1745 # elif SANITIZER_PPC64V2 1746 "mr 12, 28\n\t" 1747 "mtctr 12\n\t" 1748 # else 1749 # error "Unsupported PPC64 ABI" 1750 # endif 1751 "mr 3, 27\n\t" 1752 "bctrl\n\t" 1753 "ld 2, %13(1)\n\t" 1754 1755 /* Call _exit(r3) */ 1756 "li 0, %4\n\t" 1757 "sc\n\t" 1758 1759 /* Return to parent */ 1760 "1:\n\t" 1761 "mr %0, 3\n\t" 1762 : "=r"(res) 1763 : "0"(-1), "i"(EINVAL), "i"(__NR_clone), "i"(__NR_exit), "r"(__fn), 1764 "r"(__cstack), "r"(__flags), "r"(__arg), "r"(__ptidptr), "r"(__newtls), 1765 "r"(__ctidptr), "i"(FRAME_SIZE), "i"(FRAME_TOC_SAVE_OFFSET) 1766 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1767 return res; 1768 } 1769 # elif defined(__i386__) 1770 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1771 int *parent_tidptr, void *newtls, int *child_tidptr) { 1772 int res; 1773 if (!fn || !child_stack) 1774 return -EINVAL; 1775 CHECK_EQ(0, (uptr)child_stack % 16); 1776 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1777 ((unsigned int *)child_stack)[0] = (uptr)flags; 1778 ((unsigned int *)child_stack)[1] = (uptr)0; 1779 ((unsigned int *)child_stack)[2] = (uptr)fn; 1780 ((unsigned int *)child_stack)[3] = (uptr)arg; 1781 __asm__ __volatile__( 1782 /* %eax = syscall(%eax = SYSCALL(clone), 1783 * %ebx = flags, 1784 * %ecx = child_stack, 1785 * %edx = parent_tidptr, 1786 * %esi = new_tls, 1787 * %edi = child_tidptr) 1788 */ 1789 1790 /* Obtain flags */ 1791 "movl (%%ecx), %%ebx\n" 1792 /* Do the system call */ 1793 "pushl %%ebx\n" 1794 "pushl %%esi\n" 1795 "pushl %%edi\n" 1796 /* Remember the flag value. */ 1797 "movl %%ebx, (%%ecx)\n" 1798 "int $0x80\n" 1799 "popl %%edi\n" 1800 "popl %%esi\n" 1801 "popl %%ebx\n" 1802 1803 /* if (%eax != 0) 1804 * return; 1805 */ 1806 1807 "test %%eax,%%eax\n" 1808 "jnz 1f\n" 1809 1810 /* terminate the stack frame */ 1811 "xorl %%ebp,%%ebp\n" 1812 /* Call FN. */ 1813 "call *%%ebx\n" 1814 # ifdef PIC 1815 "call here\n" 1816 "here:\n" 1817 "popl %%ebx\n" 1818 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1819 # endif 1820 /* Call exit */ 1821 "movl %%eax, %%ebx\n" 1822 "movl %2, %%eax\n" 1823 "int $0x80\n" 1824 "1:\n" 1825 : "=a"(res) 1826 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), "c"(child_stack), 1827 "d"(parent_tidptr), "S"(newtls), "D"(child_tidptr) 1828 : "memory"); 1829 return res; 1830 } 1831 # elif defined(__arm__) 1832 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1833 int *parent_tidptr, void *newtls, int *child_tidptr) { 1834 unsigned int res; 1835 if (!fn || !child_stack) 1836 return -EINVAL; 1837 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1838 ((unsigned int *)child_stack)[0] = (uptr)fn; 1839 ((unsigned int *)child_stack)[1] = (uptr)arg; 1840 register int r0 __asm__("r0") = flags; 1841 register void *r1 __asm__("r1") = child_stack; 1842 register int *r2 __asm__("r2") = parent_tidptr; 1843 register void *r3 __asm__("r3") = newtls; 1844 register int *r4 __asm__("r4") = child_tidptr; 1845 register int r7 __asm__("r7") = __NR_clone; 1846 1847 # if __ARM_ARCH > 4 || defined(__ARM_ARCH_4T__) 1848 # define ARCH_HAS_BX 1849 # endif 1850 # if __ARM_ARCH > 4 1851 # define ARCH_HAS_BLX 1852 # endif 1853 1854 # ifdef ARCH_HAS_BX 1855 # ifdef ARCH_HAS_BLX 1856 # define BLX(R) "blx " #R "\n" 1857 # else 1858 # define BLX(R) "mov lr, pc; bx " #R "\n" 1859 # endif 1860 # else 1861 # define BLX(R) "mov lr, pc; mov pc," #R "\n" 1862 # endif 1863 1864 __asm__ __volatile__( 1865 /* %r0 = syscall(%r7 = SYSCALL(clone), 1866 * %r0 = flags, 1867 * %r1 = child_stack, 1868 * %r2 = parent_tidptr, 1869 * %r3 = new_tls, 1870 * %r4 = child_tidptr) 1871 */ 1872 1873 /* Do the system call */ 1874 "swi 0x0\n" 1875 1876 /* if (%r0 != 0) 1877 * return %r0; 1878 */ 1879 "cmp r0, #0\n" 1880 "bne 1f\n" 1881 1882 /* In the child, now. Call "fn(arg)". */ 1883 "ldr r0, [sp, #4]\n" 1884 "ldr ip, [sp], #8\n" BLX(ip) 1885 /* Call _exit(%r0). */ 1886 "mov r7, %7\n" 1887 "swi 0x0\n" 1888 "1:\n" 1889 "mov %0, r0\n" 1890 : "=r"(res) 1891 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), "i"(__NR_exit) 1892 : "memory"); 1893 return res; 1894 } 1895 # endif 1896 # endif // SANITIZER_LINUX 1897 1898 # if SANITIZER_LINUX 1899 int internal_uname(struct utsname *buf) { 1900 return internal_syscall(SYSCALL(uname), buf); 1901 } 1902 # endif 1903 1904 static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1905 switch (signum) { 1906 case SIGABRT: 1907 return common_flags()->handle_abort; 1908 case SIGILL: 1909 return common_flags()->handle_sigill; 1910 case SIGTRAP: 1911 return common_flags()->handle_sigtrap; 1912 case SIGFPE: 1913 return common_flags()->handle_sigfpe; 1914 case SIGSEGV: 1915 return common_flags()->handle_segv; 1916 case SIGBUS: 1917 return common_flags()->handle_sigbus; 1918 } 1919 return kHandleSignalNo; 1920 } 1921 1922 HandleSignalMode GetHandleSignalMode(int signum) { 1923 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1924 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1925 return kHandleSignalExclusive; 1926 return result; 1927 } 1928 1929 # if !SANITIZER_GO 1930 void *internal_start_thread(void *(*func)(void *arg), void *arg) { 1931 if (&internal_pthread_create == 0) 1932 return nullptr; 1933 // Start the thread with signals blocked, otherwise it can steal user signals. 1934 ScopedBlockSignals block(nullptr); 1935 void *th; 1936 internal_pthread_create(&th, nullptr, func, arg); 1937 return th; 1938 } 1939 1940 void internal_join_thread(void *th) { 1941 if (&internal_pthread_join) 1942 internal_pthread_join(th, nullptr); 1943 } 1944 # else 1945 void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; } 1946 1947 void internal_join_thread(void *th) {} 1948 # endif 1949 1950 # if SANITIZER_LINUX && defined(__aarch64__) 1951 // Android headers in the older NDK releases miss this definition. 1952 struct __sanitizer_esr_context { 1953 struct _aarch64_ctx head; 1954 uint64_t esr; 1955 }; 1956 1957 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1958 static const u32 kEsrMagic = 0x45535201; 1959 u8 *aux = reinterpret_cast<u8 *>(ucontext->uc_mcontext.__reserved); 1960 while (true) { 1961 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1962 if (ctx->size == 0) 1963 break; 1964 if (ctx->magic == kEsrMagic) { 1965 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1966 return true; 1967 } 1968 aux += ctx->size; 1969 } 1970 return false; 1971 } 1972 # elif SANITIZER_FREEBSD && defined(__aarch64__) 1973 // FreeBSD doesn't provide ESR in the ucontext. 1974 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { return false; } 1975 # endif 1976 1977 using Context = ucontext_t; 1978 1979 SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1980 Context *ucontext = (Context *)context; 1981 # if defined(__x86_64__) || defined(__i386__) 1982 # if !SANITIZER_HAIKU 1983 static const uptr PF_WRITE = 1U << 1; 1984 # endif 1985 # if SANITIZER_FREEBSD 1986 uptr err = ucontext->uc_mcontext.mc_err; 1987 # elif SANITIZER_NETBSD 1988 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1989 # elif SANITIZER_HAIKU 1990 uptr err = 0; // FIXME: ucontext->uc_mcontext.r13; 1991 // The err register was added on the main branch and not 1992 // available with the current release. To be reverted later. 1993 // https://github.com/haiku/haiku/commit/11adda21aa4e6b24f71a496868a44d7607bc3764 1994 # elif SANITIZER_SOLARIS && defined(__i386__) 1995 const int Err = 13; 1996 uptr err = ucontext->uc_mcontext.gregs[Err]; 1997 # else 1998 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1999 # endif // SANITIZER_FREEBSD 2000 return err & PF_WRITE ? Write : Read; 2001 # elif defined(__mips__) 2002 uint32_t *exception_source; 2003 uint32_t faulty_instruction; 2004 uint32_t op_code; 2005 2006 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 2007 faulty_instruction = (uint32_t)(*exception_source); 2008 2009 op_code = (faulty_instruction >> 26) & 0x3f; 2010 2011 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 2012 switch (op_code) { 2013 case 0x28: // sb 2014 case 0x29: // sh 2015 case 0x2b: // sw 2016 case 0x3f: // sd 2017 # if __mips_isa_rev < 6 2018 case 0x2c: // sdl 2019 case 0x2d: // sdr 2020 case 0x2a: // swl 2021 case 0x2e: // swr 2022 # endif 2023 return SignalContext::Write; 2024 2025 case 0x20: // lb 2026 case 0x24: // lbu 2027 case 0x21: // lh 2028 case 0x25: // lhu 2029 case 0x23: // lw 2030 case 0x27: // lwu 2031 case 0x37: // ld 2032 # if __mips_isa_rev < 6 2033 case 0x1a: // ldl 2034 case 0x1b: // ldr 2035 case 0x22: // lwl 2036 case 0x26: // lwr 2037 # endif 2038 return SignalContext::Read; 2039 # if __mips_isa_rev == 6 2040 case 0x3b: // pcrel 2041 op_code = (faulty_instruction >> 19) & 0x3; 2042 switch (op_code) { 2043 case 0x1: // lwpc 2044 case 0x2: // lwupc 2045 return SignalContext::Read; 2046 } 2047 # endif 2048 } 2049 return SignalContext::Unknown; 2050 # elif defined(__arm__) 2051 static const uptr FSR_WRITE = 1U << 11; 2052 uptr fsr = ucontext->uc_mcontext.error_code; 2053 return fsr & FSR_WRITE ? Write : Read; 2054 # elif defined(__aarch64__) 2055 static const u64 ESR_ELx_WNR = 1U << 6; 2056 u64 esr; 2057 if (!Aarch64GetESR(ucontext, &esr)) 2058 return Unknown; 2059 return esr & ESR_ELx_WNR ? Write : Read; 2060 # elif defined(__loongarch__) 2061 // In the musl environment, the Linux kernel uapi sigcontext.h is not 2062 // included in signal.h. To avoid missing the SC_ADDRERR_{RD,WR} macros, 2063 // copy them here. The LoongArch Linux kernel uapi is already stable, 2064 // so there's no need to worry about the value changing. 2065 # ifndef SC_ADDRERR_RD 2066 // Address error was due to memory load 2067 # define SC_ADDRERR_RD (1 << 30) 2068 # endif 2069 # ifndef SC_ADDRERR_WR 2070 // Address error was due to memory store 2071 # define SC_ADDRERR_WR (1 << 31) 2072 # endif 2073 u32 flags = ucontext->uc_mcontext.__flags; 2074 if (flags & SC_ADDRERR_RD) 2075 return SignalContext::Read; 2076 if (flags & SC_ADDRERR_WR) 2077 return SignalContext::Write; 2078 return SignalContext::Unknown; 2079 # elif defined(__sparc__) 2080 // Decode the instruction to determine the access type. 2081 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 2082 # if SANITIZER_SOLARIS 2083 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 2084 # else 2085 // Historical BSDism here. 2086 struct sigcontext *scontext = (struct sigcontext *)context; 2087 # if defined(__arch64__) 2088 uptr pc = scontext->sigc_regs.tpc; 2089 # else 2090 uptr pc = scontext->si_regs.pc; 2091 # endif 2092 # endif 2093 u32 instr = *(u32 *)pc; 2094 return (instr >> 21) & 1 ? Write : Read; 2095 # elif defined(__riscv) 2096 # if SANITIZER_FREEBSD 2097 unsigned long pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc; 2098 # else 2099 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2100 # endif 2101 unsigned faulty_instruction = *(uint16_t *)pc; 2102 2103 # if defined(__riscv_compressed) 2104 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction 2105 // set op_bits to the instruction bits [1, 0, 15, 14, 13] 2106 unsigned op_bits = 2107 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13); 2108 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive 2109 switch (op_bits) { 2110 case 0b10'010: // c.lwsp (rd != x0) 2111 # if __riscv_xlen == 64 2112 case 0b10'011: // c.ldsp (rd != x0) 2113 # endif 2114 return rd ? SignalContext::Read : SignalContext::Unknown; 2115 case 0b00'010: // c.lw 2116 # if __riscv_flen >= 32 && __riscv_xlen == 32 2117 case 0b10'011: // c.flwsp 2118 # endif 2119 # if __riscv_flen >= 32 || __riscv_xlen == 64 2120 case 0b00'011: // c.flw / c.ld 2121 # endif 2122 # if __riscv_flen == 64 2123 case 0b00'001: // c.fld 2124 case 0b10'001: // c.fldsp 2125 # endif 2126 return SignalContext::Read; 2127 case 0b00'110: // c.sw 2128 case 0b10'110: // c.swsp 2129 # if __riscv_flen >= 32 || __riscv_xlen == 64 2130 case 0b00'111: // c.fsw / c.sd 2131 case 0b10'111: // c.fswsp / c.sdsp 2132 # endif 2133 # if __riscv_flen == 64 2134 case 0b00'101: // c.fsd 2135 case 0b10'101: // c.fsdsp 2136 # endif 2137 return SignalContext::Write; 2138 default: 2139 return SignalContext::Unknown; 2140 } 2141 } 2142 # endif 2143 2144 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits 2145 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive 2146 switch (opcode) { 2147 case 0b0000011: // loads 2148 switch (funct3) { 2149 case 0b000: // lb 2150 case 0b001: // lh 2151 case 0b010: // lw 2152 # if __riscv_xlen == 64 2153 case 0b011: // ld 2154 # endif 2155 case 0b100: // lbu 2156 case 0b101: // lhu 2157 return SignalContext::Read; 2158 default: 2159 return SignalContext::Unknown; 2160 } 2161 case 0b0100011: // stores 2162 switch (funct3) { 2163 case 0b000: // sb 2164 case 0b001: // sh 2165 case 0b010: // sw 2166 # if __riscv_xlen == 64 2167 case 0b011: // sd 2168 # endif 2169 return SignalContext::Write; 2170 default: 2171 return SignalContext::Unknown; 2172 } 2173 # if __riscv_flen >= 32 2174 case 0b0000111: // floating-point loads 2175 switch (funct3) { 2176 case 0b010: // flw 2177 # if __riscv_flen == 64 2178 case 0b011: // fld 2179 # endif 2180 return SignalContext::Read; 2181 default: 2182 return SignalContext::Unknown; 2183 } 2184 case 0b0100111: // floating-point stores 2185 switch (funct3) { 2186 case 0b010: // fsw 2187 # if __riscv_flen == 64 2188 case 0b011: // fsd 2189 # endif 2190 return SignalContext::Write; 2191 default: 2192 return SignalContext::Unknown; 2193 } 2194 # endif 2195 default: 2196 return SignalContext::Unknown; 2197 } 2198 # else 2199 (void)ucontext; 2200 return Unknown; // FIXME: Implement. 2201 # endif 2202 } 2203 2204 bool SignalContext::IsTrueFaultingAddress() const { 2205 auto si = static_cast<const siginfo_t *>(siginfo); 2206 // SIGSEGV signals without a true fault address have si_code set to 128. 2207 return si->si_signo == SIGSEGV && si->si_code != 128; 2208 } 2209 2210 UNUSED 2211 static const char *RegNumToRegName(int reg) { 2212 switch (reg) { 2213 # if SANITIZER_LINUX && SANITIZER_GLIBC || SANITIZER_NETBSD 2214 # if defined(__x86_64__) 2215 # if SANITIZER_NETBSD 2216 # define REG_RAX _REG_RAX 2217 # define REG_RBX _REG_RBX 2218 # define REG_RCX _REG_RCX 2219 # define REG_RDX _REG_RDX 2220 # define REG_RDI _REG_RDI 2221 # define REG_RSI _REG_RSI 2222 # define REG_RBP _REG_RBP 2223 # define REG_RSP _REG_RSP 2224 # define REG_R8 _REG_R8 2225 # define REG_R9 _REG_R9 2226 # define REG_R10 _REG_R10 2227 # define REG_R11 _REG_R11 2228 # define REG_R12 _REG_R12 2229 # define REG_R13 _REG_R13 2230 # define REG_R14 _REG_R14 2231 # define REG_R15 _REG_R15 2232 # endif 2233 case REG_RAX: 2234 return "rax"; 2235 case REG_RBX: 2236 return "rbx"; 2237 case REG_RCX: 2238 return "rcx"; 2239 case REG_RDX: 2240 return "rdx"; 2241 case REG_RDI: 2242 return "rdi"; 2243 case REG_RSI: 2244 return "rsi"; 2245 case REG_RBP: 2246 return "rbp"; 2247 case REG_RSP: 2248 return "rsp"; 2249 case REG_R8: 2250 return "r8"; 2251 case REG_R9: 2252 return "r9"; 2253 case REG_R10: 2254 return "r10"; 2255 case REG_R11: 2256 return "r11"; 2257 case REG_R12: 2258 return "r12"; 2259 case REG_R13: 2260 return "r13"; 2261 case REG_R14: 2262 return "r14"; 2263 case REG_R15: 2264 return "r15"; 2265 # elif defined(__i386__) 2266 # if SANITIZER_NETBSD 2267 # define REG_EAX _REG_EAX 2268 # define REG_EBX _REG_EBX 2269 # define REG_ECX _REG_ECX 2270 # define REG_EDX _REG_EDX 2271 # define REG_EDI _REG_EDI 2272 # define REG_ESI _REG_ESI 2273 # define REG_EBP _REG_EBP 2274 # define REG_ESP _REG_ESP 2275 # endif 2276 case REG_EAX: 2277 return "eax"; 2278 case REG_EBX: 2279 return "ebx"; 2280 case REG_ECX: 2281 return "ecx"; 2282 case REG_EDX: 2283 return "edx"; 2284 case REG_EDI: 2285 return "edi"; 2286 case REG_ESI: 2287 return "esi"; 2288 case REG_EBP: 2289 return "ebp"; 2290 case REG_ESP: 2291 return "esp"; 2292 # elif defined(__arm__) 2293 # ifdef MAKE_CASE 2294 # undef MAKE_CASE 2295 # endif 2296 # define REG_STR(reg) #reg 2297 # define MAKE_CASE(N) \ 2298 case REG_R##N: \ 2299 return REG_STR(r##N) 2300 MAKE_CASE(0); 2301 MAKE_CASE(1); 2302 MAKE_CASE(2); 2303 MAKE_CASE(3); 2304 MAKE_CASE(4); 2305 MAKE_CASE(5); 2306 MAKE_CASE(6); 2307 MAKE_CASE(7); 2308 MAKE_CASE(8); 2309 MAKE_CASE(9); 2310 MAKE_CASE(10); 2311 MAKE_CASE(11); 2312 MAKE_CASE(12); 2313 case REG_R13: 2314 return "sp"; 2315 case REG_R14: 2316 return "lr"; 2317 case REG_R15: 2318 return "pc"; 2319 # elif defined(__aarch64__) 2320 # define REG_STR(reg) #reg 2321 # define MAKE_CASE(N) \ 2322 case N: \ 2323 return REG_STR(x##N) 2324 MAKE_CASE(0); 2325 MAKE_CASE(1); 2326 MAKE_CASE(2); 2327 MAKE_CASE(3); 2328 MAKE_CASE(4); 2329 MAKE_CASE(5); 2330 MAKE_CASE(6); 2331 MAKE_CASE(7); 2332 MAKE_CASE(8); 2333 MAKE_CASE(9); 2334 MAKE_CASE(10); 2335 MAKE_CASE(11); 2336 MAKE_CASE(12); 2337 MAKE_CASE(13); 2338 MAKE_CASE(14); 2339 MAKE_CASE(15); 2340 MAKE_CASE(16); 2341 MAKE_CASE(17); 2342 MAKE_CASE(18); 2343 MAKE_CASE(19); 2344 MAKE_CASE(20); 2345 MAKE_CASE(21); 2346 MAKE_CASE(22); 2347 MAKE_CASE(23); 2348 MAKE_CASE(24); 2349 MAKE_CASE(25); 2350 MAKE_CASE(26); 2351 MAKE_CASE(27); 2352 MAKE_CASE(28); 2353 case 29: 2354 return "fp"; 2355 case 30: 2356 return "lr"; 2357 case 31: 2358 return "sp"; 2359 # endif 2360 # endif // SANITIZER_LINUX && SANITIZER_GLIBC 2361 default: 2362 return NULL; 2363 } 2364 return NULL; 2365 } 2366 2367 # if ((SANITIZER_LINUX && SANITIZER_GLIBC) || SANITIZER_NETBSD) && \ 2368 (defined(__arm__) || defined(__aarch64__)) 2369 static uptr GetArmRegister(ucontext_t *ctx, int RegNum) { 2370 switch (RegNum) { 2371 # if defined(__arm__) && !SANITIZER_NETBSD 2372 # ifdef MAKE_CASE 2373 # undef MAKE_CASE 2374 # endif 2375 # define MAKE_CASE(N) \ 2376 case REG_R##N: \ 2377 return ctx->uc_mcontext.arm_r##N 2378 MAKE_CASE(0); 2379 MAKE_CASE(1); 2380 MAKE_CASE(2); 2381 MAKE_CASE(3); 2382 MAKE_CASE(4); 2383 MAKE_CASE(5); 2384 MAKE_CASE(6); 2385 MAKE_CASE(7); 2386 MAKE_CASE(8); 2387 MAKE_CASE(9); 2388 MAKE_CASE(10); 2389 case REG_R11: 2390 return ctx->uc_mcontext.arm_fp; 2391 case REG_R12: 2392 return ctx->uc_mcontext.arm_ip; 2393 case REG_R13: 2394 return ctx->uc_mcontext.arm_sp; 2395 case REG_R14: 2396 return ctx->uc_mcontext.arm_lr; 2397 case REG_R15: 2398 return ctx->uc_mcontext.arm_pc; 2399 # elif defined(__aarch64__) 2400 # if SANITIZER_LINUX 2401 case 0 ... 30: 2402 return ctx->uc_mcontext.regs[RegNum]; 2403 case 31: 2404 return ctx->uc_mcontext.sp; 2405 # elif SANITIZER_NETBSD 2406 case 0 ... 31: 2407 return ctx->uc_mcontext.__gregs[RegNum]; 2408 # endif 2409 # endif 2410 default: 2411 return 0; 2412 } 2413 return 0; 2414 } 2415 # endif // SANITIZER_LINUX && SANITIZER_GLIBC && (defined(__arm__) || 2416 // defined(__aarch64__)) 2417 2418 UNUSED 2419 static void DumpSingleReg(ucontext_t *ctx, int RegNum) { 2420 const char *RegName = RegNumToRegName(RegNum); 2421 # if SANITIZER_LINUX && SANITIZER_GLIBC || SANITIZER_NETBSD 2422 # if defined(__x86_64__) 2423 Printf("%s%s = 0x%016llx ", internal_strlen(RegName) == 2 ? " " : "", 2424 RegName, 2425 # if SANITIZER_LINUX 2426 ctx->uc_mcontext.gregs[RegNum] 2427 # elif SANITIZER_NETBSD 2428 ctx->uc_mcontext.__gregs[RegNum] 2429 # endif 2430 ); 2431 # elif defined(__i386__) 2432 Printf("%s = 0x%08x ", RegName, 2433 # if SANITIZER_LINUX 2434 ctx->uc_mcontext.gregs[RegNum] 2435 # elif SANITIZER_NETBSD 2436 ctx->uc_mcontext.__gregs[RegNum] 2437 # endif 2438 ); 2439 # elif defined(__arm__) 2440 Printf("%s%s = 0x%08zx ", internal_strlen(RegName) == 2 ? " " : "", RegName, 2441 GetArmRegister(ctx, RegNum)); 2442 # elif defined(__aarch64__) 2443 Printf("%s%s = 0x%016zx ", internal_strlen(RegName) == 2 ? " " : "", RegName, 2444 GetArmRegister(ctx, RegNum)); 2445 # else 2446 (void)RegName; 2447 # endif 2448 # else 2449 (void)RegName; 2450 # endif 2451 } 2452 2453 void SignalContext::DumpAllRegisters(void *context) { 2454 ucontext_t *ucontext = (ucontext_t *)context; 2455 # if SANITIZER_LINUX && SANITIZER_GLIBC || SANITIZER_NETBSD 2456 # if defined(__x86_64__) 2457 Report("Register values:\n"); 2458 DumpSingleReg(ucontext, REG_RAX); 2459 DumpSingleReg(ucontext, REG_RBX); 2460 DumpSingleReg(ucontext, REG_RCX); 2461 DumpSingleReg(ucontext, REG_RDX); 2462 Printf("\n"); 2463 DumpSingleReg(ucontext, REG_RDI); 2464 DumpSingleReg(ucontext, REG_RSI); 2465 DumpSingleReg(ucontext, REG_RBP); 2466 DumpSingleReg(ucontext, REG_RSP); 2467 Printf("\n"); 2468 DumpSingleReg(ucontext, REG_R8); 2469 DumpSingleReg(ucontext, REG_R9); 2470 DumpSingleReg(ucontext, REG_R10); 2471 DumpSingleReg(ucontext, REG_R11); 2472 Printf("\n"); 2473 DumpSingleReg(ucontext, REG_R12); 2474 DumpSingleReg(ucontext, REG_R13); 2475 DumpSingleReg(ucontext, REG_R14); 2476 DumpSingleReg(ucontext, REG_R15); 2477 Printf("\n"); 2478 # elif defined(__i386__) 2479 // Duplication of this report print is caused by partial support 2480 // of register values dumping. In case of unsupported yet architecture let's 2481 // avoid printing 'Register values:' without actual values in the following 2482 // output. 2483 Report("Register values:\n"); 2484 DumpSingleReg(ucontext, REG_EAX); 2485 DumpSingleReg(ucontext, REG_EBX); 2486 DumpSingleReg(ucontext, REG_ECX); 2487 DumpSingleReg(ucontext, REG_EDX); 2488 Printf("\n"); 2489 DumpSingleReg(ucontext, REG_EDI); 2490 DumpSingleReg(ucontext, REG_ESI); 2491 DumpSingleReg(ucontext, REG_EBP); 2492 DumpSingleReg(ucontext, REG_ESP); 2493 Printf("\n"); 2494 # elif defined(__arm__) && !SANITIZER_NETBSD 2495 Report("Register values:\n"); 2496 DumpSingleReg(ucontext, REG_R0); 2497 DumpSingleReg(ucontext, REG_R1); 2498 DumpSingleReg(ucontext, REG_R2); 2499 DumpSingleReg(ucontext, REG_R3); 2500 Printf("\n"); 2501 DumpSingleReg(ucontext, REG_R4); 2502 DumpSingleReg(ucontext, REG_R5); 2503 DumpSingleReg(ucontext, REG_R6); 2504 DumpSingleReg(ucontext, REG_R7); 2505 Printf("\n"); 2506 DumpSingleReg(ucontext, REG_R8); 2507 DumpSingleReg(ucontext, REG_R9); 2508 DumpSingleReg(ucontext, REG_R10); 2509 DumpSingleReg(ucontext, REG_R11); 2510 Printf("\n"); 2511 DumpSingleReg(ucontext, REG_R12); 2512 DumpSingleReg(ucontext, REG_R13); 2513 DumpSingleReg(ucontext, REG_R14); 2514 DumpSingleReg(ucontext, REG_R15); 2515 Printf("\n"); 2516 # elif defined(__aarch64__) 2517 Report("Register values:\n"); 2518 for (int i = 0; i <= 31; ++i) { 2519 DumpSingleReg(ucontext, i); 2520 if (i % 4 == 3) 2521 Printf("\n"); 2522 } 2523 # else 2524 (void)ucontext; 2525 # endif 2526 # elif SANITIZER_FREEBSD 2527 # if defined(__x86_64__) 2528 Report("Register values:\n"); 2529 Printf("rax = 0x%016lx ", ucontext->uc_mcontext.mc_rax); 2530 Printf("rbx = 0x%016lx ", ucontext->uc_mcontext.mc_rbx); 2531 Printf("rcx = 0x%016lx ", ucontext->uc_mcontext.mc_rcx); 2532 Printf("rdx = 0x%016lx ", ucontext->uc_mcontext.mc_rdx); 2533 Printf("\n"); 2534 Printf("rdi = 0x%016lx ", ucontext->uc_mcontext.mc_rdi); 2535 Printf("rsi = 0x%016lx ", ucontext->uc_mcontext.mc_rsi); 2536 Printf("rbp = 0x%016lx ", ucontext->uc_mcontext.mc_rbp); 2537 Printf("rsp = 0x%016lx ", ucontext->uc_mcontext.mc_rsp); 2538 Printf("\n"); 2539 Printf(" r8 = 0x%016lx ", ucontext->uc_mcontext.mc_r8); 2540 Printf(" r9 = 0x%016lx ", ucontext->uc_mcontext.mc_r9); 2541 Printf("r10 = 0x%016lx ", ucontext->uc_mcontext.mc_r10); 2542 Printf("r11 = 0x%016lx ", ucontext->uc_mcontext.mc_r11); 2543 Printf("\n"); 2544 Printf("r12 = 0x%016lx ", ucontext->uc_mcontext.mc_r12); 2545 Printf("r13 = 0x%016lx ", ucontext->uc_mcontext.mc_r13); 2546 Printf("r14 = 0x%016lx ", ucontext->uc_mcontext.mc_r14); 2547 Printf("r15 = 0x%016lx ", ucontext->uc_mcontext.mc_r15); 2548 Printf("\n"); 2549 # elif defined(__i386__) 2550 Report("Register values:\n"); 2551 Printf("eax = 0x%08x ", ucontext->uc_mcontext.mc_eax); 2552 Printf("ebx = 0x%08x ", ucontext->uc_mcontext.mc_ebx); 2553 Printf("ecx = 0x%08x ", ucontext->uc_mcontext.mc_ecx); 2554 Printf("edx = 0x%08x ", ucontext->uc_mcontext.mc_edx); 2555 Printf("\n"); 2556 Printf("edi = 0x%08x ", ucontext->uc_mcontext.mc_edi); 2557 Printf("esi = 0x%08x ", ucontext->uc_mcontext.mc_esi); 2558 Printf("ebp = 0x%08x ", ucontext->uc_mcontext.mc_ebp); 2559 Printf("esp = 0x%08x ", ucontext->uc_mcontext.mc_esp); 2560 Printf("\n"); 2561 # else 2562 (void)ucontext; 2563 # endif 2564 # else 2565 (void)ucontext; 2566 # endif 2567 // FIXME: Implement this for other OSes and architectures. 2568 } 2569 2570 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 2571 # if SANITIZER_NETBSD 2572 // This covers all NetBSD architectures 2573 ucontext_t *ucontext = (ucontext_t *)context; 2574 *pc = _UC_MACHINE_PC(ucontext); 2575 *bp = _UC_MACHINE_FP(ucontext); 2576 *sp = _UC_MACHINE_SP(ucontext); 2577 # elif defined(__arm__) 2578 ucontext_t *ucontext = (ucontext_t *)context; 2579 *pc = ucontext->uc_mcontext.arm_pc; 2580 *bp = ucontext->uc_mcontext.arm_fp; 2581 *sp = ucontext->uc_mcontext.arm_sp; 2582 # elif defined(__aarch64__) 2583 # if SANITIZER_FREEBSD 2584 ucontext_t *ucontext = (ucontext_t *)context; 2585 *pc = ucontext->uc_mcontext.mc_gpregs.gp_elr; 2586 *bp = ucontext->uc_mcontext.mc_gpregs.gp_x[29]; 2587 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp; 2588 # else 2589 ucontext_t *ucontext = (ucontext_t *)context; 2590 *pc = ucontext->uc_mcontext.pc; 2591 *bp = ucontext->uc_mcontext.regs[29]; 2592 *sp = ucontext->uc_mcontext.sp; 2593 # endif 2594 # elif defined(__hppa__) 2595 ucontext_t *ucontext = (ucontext_t *)context; 2596 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 2597 /* GCC uses %r3 whenever a frame pointer is needed. */ 2598 *bp = ucontext->uc_mcontext.sc_gr[3]; 2599 *sp = ucontext->uc_mcontext.sc_gr[30]; 2600 # elif defined(__x86_64__) 2601 # if SANITIZER_FREEBSD 2602 ucontext_t *ucontext = (ucontext_t *)context; 2603 *pc = ucontext->uc_mcontext.mc_rip; 2604 *bp = ucontext->uc_mcontext.mc_rbp; 2605 *sp = ucontext->uc_mcontext.mc_rsp; 2606 # elif SANITIZER_HAIKU 2607 ucontext_t *ucontext = (ucontext_t *)context; 2608 *pc = ucontext->uc_mcontext.rip; 2609 *bp = ucontext->uc_mcontext.rbp; 2610 *sp = ucontext->uc_mcontext.rsp; 2611 # else 2612 ucontext_t *ucontext = (ucontext_t *)context; 2613 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 2614 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 2615 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 2616 # endif 2617 # elif defined(__i386__) 2618 # if SANITIZER_FREEBSD 2619 ucontext_t *ucontext = (ucontext_t *)context; 2620 *pc = ucontext->uc_mcontext.mc_eip; 2621 *bp = ucontext->uc_mcontext.mc_ebp; 2622 *sp = ucontext->uc_mcontext.mc_esp; 2623 # elif SANITIZER_HAIKU 2624 ucontext_t *ucontext = (ucontext_t *)context; 2625 *pc = ucontext->uc_mcontext.eip; 2626 *bp = ucontext->uc_mcontext.ebp; 2627 *sp = ucontext->uc_mcontext.esp; 2628 # else 2629 ucontext_t *ucontext = (ucontext_t *)context; 2630 # if SANITIZER_SOLARIS 2631 /* Use the numeric values: the symbolic ones are undefined by llvm 2632 include/llvm/Support/Solaris.h. */ 2633 # ifndef REG_EIP 2634 # define REG_EIP 14 // REG_PC 2635 # endif 2636 # ifndef REG_EBP 2637 # define REG_EBP 6 // REG_FP 2638 # endif 2639 # ifndef REG_UESP 2640 # define REG_UESP 17 // REG_SP 2641 # endif 2642 # endif 2643 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 2644 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 2645 *sp = ucontext->uc_mcontext.gregs[REG_UESP]; 2646 # endif 2647 # elif defined(__powerpc__) || defined(__powerpc64__) 2648 # if SANITIZER_FREEBSD 2649 ucontext_t *ucontext = (ucontext_t *)context; 2650 *pc = ucontext->uc_mcontext.mc_srr0; 2651 *sp = ucontext->uc_mcontext.mc_frame[1]; 2652 *bp = ucontext->uc_mcontext.mc_frame[31]; 2653 # else 2654 ucontext_t *ucontext = (ucontext_t *)context; 2655 *pc = ucontext->uc_mcontext.regs->nip; 2656 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 2657 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 2658 // pointer, but GCC always uses r31 when we need a frame pointer. 2659 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 2660 # endif 2661 # elif defined(__sparc__) 2662 # if defined(__arch64__) || defined(__sparcv9) 2663 # define STACK_BIAS 2047 2664 # else 2665 # define STACK_BIAS 0 2666 # endif 2667 # if SANITIZER_SOLARIS 2668 ucontext_t *ucontext = (ucontext_t *)context; 2669 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 2670 *sp = ucontext->uc_mcontext.gregs[REG_SP] + STACK_BIAS; 2671 // Avoid SEGV when dereferencing sp on stack overflow with non-faulting load. 2672 // This requires a SPARC V9 CPU. Cannot use #ASI_PNF here: only supported 2673 // since clang-19. 2674 # if defined(__sparcv9) 2675 asm("ldxa [%[fp]] 0x82, %[bp]" 2676 # else 2677 asm("lduwa [%[fp]] 0x82, %[bp]" 2678 # endif 2679 : [bp] "=r"(*bp) 2680 : [fp] "r"(&((struct frame *)*sp)->fr_savfp)); 2681 if (*bp) 2682 *bp += STACK_BIAS; 2683 # else 2684 // Historical BSDism here. 2685 struct sigcontext *scontext = (struct sigcontext *)context; 2686 # if defined(__arch64__) 2687 *pc = scontext->sigc_regs.tpc; 2688 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS; 2689 # else 2690 *pc = scontext->si_regs.pc; 2691 *sp = scontext->si_regs.u_regs[14]; 2692 # endif 2693 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS; 2694 # endif 2695 # elif defined(__mips__) 2696 ucontext_t *ucontext = (ucontext_t *)context; 2697 *pc = ucontext->uc_mcontext.pc; 2698 *bp = ucontext->uc_mcontext.gregs[30]; 2699 *sp = ucontext->uc_mcontext.gregs[29]; 2700 # elif defined(__s390__) 2701 ucontext_t *ucontext = (ucontext_t *)context; 2702 # if defined(__s390x__) 2703 *pc = ucontext->uc_mcontext.psw.addr; 2704 # else 2705 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 2706 # endif 2707 *bp = ucontext->uc_mcontext.gregs[11]; 2708 *sp = ucontext->uc_mcontext.gregs[15]; 2709 # elif defined(__riscv) 2710 ucontext_t *ucontext = (ucontext_t *)context; 2711 # if SANITIZER_FREEBSD 2712 *pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc; 2713 *bp = ucontext->uc_mcontext.mc_gpregs.gp_s[0]; 2714 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp; 2715 # else 2716 *pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2717 *bp = ucontext->uc_mcontext.__gregs[REG_S0]; 2718 *sp = ucontext->uc_mcontext.__gregs[REG_SP]; 2719 # endif 2720 # elif defined(__hexagon__) 2721 ucontext_t *ucontext = (ucontext_t *)context; 2722 *pc = ucontext->uc_mcontext.pc; 2723 *bp = ucontext->uc_mcontext.r30; 2724 *sp = ucontext->uc_mcontext.r29; 2725 # elif defined(__loongarch__) 2726 ucontext_t *ucontext = (ucontext_t *)context; 2727 *pc = ucontext->uc_mcontext.__pc; 2728 *bp = ucontext->uc_mcontext.__gregs[22]; 2729 *sp = ucontext->uc_mcontext.__gregs[3]; 2730 # else 2731 # error "Unsupported arch" 2732 # endif 2733 } 2734 2735 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 2736 2737 void InitializePlatformEarly() { InitTlsSize(); } 2738 2739 void CheckASLR() { 2740 # if SANITIZER_NETBSD 2741 int mib[3]; 2742 int paxflags; 2743 uptr len = sizeof(paxflags); 2744 2745 mib[0] = CTL_PROC; 2746 mib[1] = internal_getpid(); 2747 mib[2] = PROC_PID_PAXFLAGS; 2748 2749 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2750 Printf("sysctl failed\n"); 2751 Die(); 2752 } 2753 2754 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2755 Printf( 2756 "This sanitizer is not compatible with enabled ASLR.\n" 2757 "To disable ASLR, please run \"paxctl +a %s\" and try again.\n", 2758 GetArgv()[0]); 2759 Die(); 2760 } 2761 # elif SANITIZER_FREEBSD 2762 int aslr_status; 2763 int r = internal_procctl(P_PID, 0, PROC_ASLR_STATUS, &aslr_status); 2764 if (UNLIKELY(r == -1)) { 2765 // We're making things less 'dramatic' here since 2766 // the cmd is not necessarily guaranteed to be here 2767 // just yet regarding FreeBSD release 2768 return; 2769 } 2770 if ((aslr_status & PROC_ASLR_ACTIVE) != 0) { 2771 VReport(1, 2772 "This sanitizer is not compatible with enabled ASLR " 2773 "and binaries compiled with PIE\n" 2774 "ASLR will be disabled and the program re-executed.\n"); 2775 int aslr_ctl = PROC_ASLR_FORCE_DISABLE; 2776 CHECK_NE(internal_procctl(P_PID, 0, PROC_ASLR_CTL, &aslr_ctl), -1); 2777 ReExec(); 2778 } 2779 # elif SANITIZER_PPC64V2 2780 // Disable ASLR for Linux PPC64LE. 2781 int old_personality = personality(0xffffffff); 2782 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2783 VReport(1, 2784 "WARNING: Program is being run with address space layout " 2785 "randomization (ASLR) enabled which prevents the thread and " 2786 "memory sanitizers from working on powerpc64le.\n" 2787 "ASLR will be disabled and the program re-executed.\n"); 2788 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2789 ReExec(); 2790 } 2791 # else 2792 // Do nothing 2793 # endif 2794 } 2795 2796 void CheckMPROTECT() { 2797 # if SANITIZER_NETBSD 2798 int mib[3]; 2799 int paxflags; 2800 uptr len = sizeof(paxflags); 2801 2802 mib[0] = CTL_PROC; 2803 mib[1] = internal_getpid(); 2804 mib[2] = PROC_PID_PAXFLAGS; 2805 2806 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2807 Printf("sysctl failed\n"); 2808 Die(); 2809 } 2810 2811 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2812 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2813 Die(); 2814 } 2815 # else 2816 // Do nothing 2817 # endif 2818 } 2819 2820 void CheckNoDeepBind(const char *filename, int flag) { 2821 # ifdef RTLD_DEEPBIND 2822 if (flag & RTLD_DEEPBIND) { 2823 Report( 2824 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2825 " which is incompatible with sanitizer runtime " 2826 "(see https://github.com/google/sanitizers/issues/611 for details" 2827 "). If you want to run %s library under sanitizers please remove " 2828 "RTLD_DEEPBIND from dlopen flags.\n", 2829 filename, filename); 2830 Die(); 2831 } 2832 # endif 2833 } 2834 2835 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2836 uptr *largest_gap_found, 2837 uptr *max_occupied_addr) { 2838 UNREACHABLE("FindAvailableMemoryRange is not available"); 2839 return 0; 2840 } 2841 2842 bool GetRandom(void *buffer, uptr length, bool blocking) { 2843 if (!buffer || !length || length > 256) 2844 return false; 2845 # if SANITIZER_USE_GETENTROPY 2846 uptr rnd = getentropy(buffer, length); 2847 int rverrno = 0; 2848 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2849 return false; 2850 else if (rnd == 0) 2851 return true; 2852 # endif // SANITIZER_USE_GETENTROPY 2853 2854 # if SANITIZER_USE_GETRANDOM 2855 static atomic_uint8_t skip_getrandom_syscall; 2856 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2857 // Up to 256 bytes, getrandom will not be interrupted. 2858 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2859 blocking ? 0 : GRND_NONBLOCK); 2860 int rverrno = 0; 2861 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2862 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2863 else if (res == length) 2864 return true; 2865 } 2866 # endif // SANITIZER_USE_GETRANDOM 2867 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2868 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2869 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2870 if (internal_iserror(fd)) 2871 return false; 2872 uptr res = internal_read(fd, buffer, length); 2873 if (internal_iserror(res)) 2874 return false; 2875 internal_close(fd); 2876 return true; 2877 } 2878 2879 } // namespace __sanitizer 2880 2881 #endif 2882