1 //===-- sanitizer_linux.cpp -----------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is shared between AddressSanitizer and ThreadSanitizer 10 // run-time libraries and implements linux-specific functions from 11 // sanitizer_libc.h. 12 //===----------------------------------------------------------------------===// 13 14 #include "sanitizer_platform.h" 15 16 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \ 17 SANITIZER_SOLARIS 18 19 #include "sanitizer_common.h" 20 #include "sanitizer_flags.h" 21 #include "sanitizer_getauxval.h" 22 #include "sanitizer_internal_defs.h" 23 #include "sanitizer_libc.h" 24 #include "sanitizer_linux.h" 25 #include "sanitizer_mutex.h" 26 #include "sanitizer_placement_new.h" 27 #include "sanitizer_procmaps.h" 28 29 #if SANITIZER_LINUX && !SANITIZER_GO 30 #include <asm/param.h> 31 #endif 32 33 // For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat' 34 // format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To 35 // access stat from asm/stat.h, without conflicting with definition in 36 // sys/stat.h, we use this trick. 37 #if defined(__mips64) 38 #include <asm/unistd.h> 39 #include <sys/types.h> 40 #define stat kernel_stat 41 #if SANITIZER_GO 42 #undef st_atime 43 #undef st_mtime 44 #undef st_ctime 45 #define st_atime st_atim 46 #define st_mtime st_mtim 47 #define st_ctime st_ctim 48 #endif 49 #include <asm/stat.h> 50 #undef stat 51 #endif 52 53 #include <dlfcn.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <link.h> 57 #include <pthread.h> 58 #include <sched.h> 59 #include <signal.h> 60 #include <sys/mman.h> 61 #include <sys/param.h> 62 #if !SANITIZER_SOLARIS 63 #include <sys/ptrace.h> 64 #endif 65 #include <sys/resource.h> 66 #include <sys/stat.h> 67 #include <sys/syscall.h> 68 #include <sys/time.h> 69 #include <sys/types.h> 70 #include <ucontext.h> 71 #include <unistd.h> 72 73 #if SANITIZER_LINUX 74 #include <sys/utsname.h> 75 #endif 76 77 #if SANITIZER_LINUX && !SANITIZER_ANDROID 78 #include <sys/personality.h> 79 #endif 80 81 #if SANITIZER_FREEBSD 82 #include <sys/exec.h> 83 #include <sys/sysctl.h> 84 #include <machine/atomic.h> 85 extern "C" { 86 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on 87 // FreeBSD 9.2 and 10.0. 88 #include <sys/umtx.h> 89 } 90 #include <sys/thr.h> 91 #endif // SANITIZER_FREEBSD 92 93 #if SANITIZER_NETBSD 94 #include <limits.h> // For NAME_MAX 95 #include <sys/sysctl.h> 96 #include <sys/exec.h> 97 extern struct ps_strings *__ps_strings; 98 #endif // SANITIZER_NETBSD 99 100 #if SANITIZER_SOLARIS 101 #include <stdlib.h> 102 #include <thread.h> 103 #define environ _environ 104 #endif 105 106 extern char **environ; 107 108 #if SANITIZER_LINUX 109 // <linux/time.h> 110 struct kernel_timeval { 111 long tv_sec; 112 long tv_usec; 113 }; 114 115 // <linux/futex.h> is broken on some linux distributions. 116 const int FUTEX_WAIT = 0; 117 const int FUTEX_WAKE = 1; 118 const int FUTEX_PRIVATE_FLAG = 128; 119 const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; 120 const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; 121 #endif // SANITIZER_LINUX 122 123 // Are we using 32-bit or 64-bit Linux syscalls? 124 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 125 // but it still needs to use 64-bit syscalls. 126 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \ 127 SANITIZER_WORDSIZE == 64) 128 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 129 #else 130 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 131 #endif 132 133 // Note : FreeBSD had implemented both 134 // Linux apis, available from 135 // future 12.x version most likely 136 #if SANITIZER_LINUX && defined(__NR_getrandom) 137 # if !defined(GRND_NONBLOCK) 138 # define GRND_NONBLOCK 1 139 # endif 140 # define SANITIZER_USE_GETRANDOM 1 141 #else 142 # define SANITIZER_USE_GETRANDOM 0 143 #endif // SANITIZER_LINUX && defined(__NR_getrandom) 144 145 #if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000 146 # define SANITIZER_USE_GETENTROPY 1 147 #else 148 # define SANITIZER_USE_GETENTROPY 0 149 #endif 150 151 namespace __sanitizer { 152 153 #if SANITIZER_LINUX && defined(__x86_64__) 154 #include "sanitizer_syscall_linux_x86_64.inc" 155 #elif SANITIZER_LINUX && SANITIZER_RISCV64 156 #include "sanitizer_syscall_linux_riscv64.inc" 157 #elif SANITIZER_LINUX && defined(__aarch64__) 158 #include "sanitizer_syscall_linux_aarch64.inc" 159 #elif SANITIZER_LINUX && defined(__arm__) 160 #include "sanitizer_syscall_linux_arm.inc" 161 #else 162 #include "sanitizer_syscall_generic.inc" 163 #endif 164 165 // --------------- sanitizer_libc.h 166 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 167 #if !SANITIZER_S390 168 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd, 169 u64 offset) { 170 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 171 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd, 172 offset); 173 #else 174 // mmap2 specifies file offset in 4096-byte units. 175 CHECK(IsAligned(offset, 4096)); 176 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd, 177 offset / 4096); 178 #endif 179 } 180 #endif // !SANITIZER_S390 181 182 uptr internal_munmap(void *addr, uptr length) { 183 return internal_syscall(SYSCALL(munmap), (uptr)addr, length); 184 } 185 186 #if SANITIZER_LINUX 187 uptr internal_mremap(void *old_address, uptr old_size, uptr new_size, int flags, 188 void *new_address) { 189 return internal_syscall(SYSCALL(mremap), (uptr)old_address, old_size, 190 new_size, flags, (uptr)new_address); 191 } 192 #endif 193 194 int internal_mprotect(void *addr, uptr length, int prot) { 195 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot); 196 } 197 198 int internal_madvise(uptr addr, uptr length, int advice) { 199 return internal_syscall(SYSCALL(madvise), addr, length, advice); 200 } 201 202 uptr internal_close(fd_t fd) { 203 return internal_syscall(SYSCALL(close), fd); 204 } 205 206 uptr internal_open(const char *filename, int flags) { 207 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 208 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags); 209 #else 210 return internal_syscall(SYSCALL(open), (uptr)filename, flags); 211 #endif 212 } 213 214 uptr internal_open(const char *filename, int flags, u32 mode) { 215 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 216 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags, 217 mode); 218 #else 219 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode); 220 #endif 221 } 222 223 uptr internal_read(fd_t fd, void *buf, uptr count) { 224 sptr res; 225 HANDLE_EINTR(res, 226 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)); 227 return res; 228 } 229 230 uptr internal_write(fd_t fd, const void *buf, uptr count) { 231 sptr res; 232 HANDLE_EINTR(res, 233 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)); 234 return res; 235 } 236 237 uptr internal_ftruncate(fd_t fd, uptr size) { 238 sptr res; 239 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd, 240 (OFF_T)size)); 241 return res; 242 } 243 244 #if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && SANITIZER_LINUX 245 static void stat64_to_stat(struct stat64 *in, struct stat *out) { 246 internal_memset(out, 0, sizeof(*out)); 247 out->st_dev = in->st_dev; 248 out->st_ino = in->st_ino; 249 out->st_mode = in->st_mode; 250 out->st_nlink = in->st_nlink; 251 out->st_uid = in->st_uid; 252 out->st_gid = in->st_gid; 253 out->st_rdev = in->st_rdev; 254 out->st_size = in->st_size; 255 out->st_blksize = in->st_blksize; 256 out->st_blocks = in->st_blocks; 257 out->st_atime = in->st_atime; 258 out->st_mtime = in->st_mtime; 259 out->st_ctime = in->st_ctime; 260 } 261 #endif 262 263 #if defined(__mips64) 264 // Undefine compatibility macros from <sys/stat.h> 265 // so that they would not clash with the kernel_stat 266 // st_[a|m|c]time fields 267 #if !SANITIZER_GO 268 #undef st_atime 269 #undef st_mtime 270 #undef st_ctime 271 #endif 272 #if defined(SANITIZER_ANDROID) 273 // Bionic sys/stat.h defines additional macros 274 // for compatibility with the old NDKs and 275 // they clash with the kernel_stat structure 276 // st_[a|m|c]time_nsec fields. 277 #undef st_atime_nsec 278 #undef st_mtime_nsec 279 #undef st_ctime_nsec 280 #endif 281 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) { 282 internal_memset(out, 0, sizeof(*out)); 283 out->st_dev = in->st_dev; 284 out->st_ino = in->st_ino; 285 out->st_mode = in->st_mode; 286 out->st_nlink = in->st_nlink; 287 out->st_uid = in->st_uid; 288 out->st_gid = in->st_gid; 289 out->st_rdev = in->st_rdev; 290 out->st_size = in->st_size; 291 out->st_blksize = in->st_blksize; 292 out->st_blocks = in->st_blocks; 293 #if defined(__USE_MISC) || \ 294 defined(__USE_XOPEN2K8) || \ 295 defined(SANITIZER_ANDROID) 296 out->st_atim.tv_sec = in->st_atime; 297 out->st_atim.tv_nsec = in->st_atime_nsec; 298 out->st_mtim.tv_sec = in->st_mtime; 299 out->st_mtim.tv_nsec = in->st_mtime_nsec; 300 out->st_ctim.tv_sec = in->st_ctime; 301 out->st_ctim.tv_nsec = in->st_ctime_nsec; 302 #else 303 out->st_atime = in->st_atime; 304 out->st_atimensec = in->st_atime_nsec; 305 out->st_mtime = in->st_mtime; 306 out->st_mtimensec = in->st_mtime_nsec; 307 out->st_ctime = in->st_ctime; 308 out->st_atimensec = in->st_ctime_nsec; 309 #endif 310 } 311 #endif 312 313 uptr internal_stat(const char *path, void *buf) { 314 #if SANITIZER_FREEBSD 315 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0); 316 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 317 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 318 0); 319 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 320 # if defined(__mips64) 321 // For mips64, stat syscall fills buffer in the format of kernel_stat 322 struct kernel_stat kbuf; 323 int res = internal_syscall(SYSCALL(stat), path, &kbuf); 324 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 325 return res; 326 # else 327 return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf); 328 # endif 329 #else 330 struct stat64 buf64; 331 int res = internal_syscall(SYSCALL(stat64), path, &buf64); 332 stat64_to_stat(&buf64, (struct stat *)buf); 333 return res; 334 #endif 335 } 336 337 uptr internal_lstat(const char *path, void *buf) { 338 #if SANITIZER_FREEBSD 339 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 340 AT_SYMLINK_NOFOLLOW); 341 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 342 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 343 AT_SYMLINK_NOFOLLOW); 344 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 345 # if SANITIZER_MIPS64 346 // For mips64, lstat syscall fills buffer in the format of kernel_stat 347 struct kernel_stat kbuf; 348 int res = internal_syscall(SYSCALL(lstat), path, &kbuf); 349 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 350 return res; 351 # else 352 return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf); 353 # endif 354 #else 355 struct stat64 buf64; 356 int res = internal_syscall(SYSCALL(lstat64), path, &buf64); 357 stat64_to_stat(&buf64, (struct stat *)buf); 358 return res; 359 #endif 360 } 361 362 uptr internal_fstat(fd_t fd, void *buf) { 363 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 364 #if SANITIZER_MIPS64 365 // For mips64, fstat syscall fills buffer in the format of kernel_stat 366 struct kernel_stat kbuf; 367 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf); 368 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 369 return res; 370 # else 371 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf); 372 # endif 373 #else 374 struct stat64 buf64; 375 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64); 376 stat64_to_stat(&buf64, (struct stat *)buf); 377 return res; 378 #endif 379 } 380 381 uptr internal_filesize(fd_t fd) { 382 struct stat st; 383 if (internal_fstat(fd, &st)) 384 return -1; 385 return (uptr)st.st_size; 386 } 387 388 uptr internal_dup(int oldfd) { 389 return internal_syscall(SYSCALL(dup), oldfd); 390 } 391 392 uptr internal_dup2(int oldfd, int newfd) { 393 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 394 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0); 395 #else 396 return internal_syscall(SYSCALL(dup2), oldfd, newfd); 397 #endif 398 } 399 400 uptr internal_readlink(const char *path, char *buf, uptr bufsize) { 401 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 402 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 403 bufsize); 404 #else 405 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize); 406 #endif 407 } 408 409 uptr internal_unlink(const char *path) { 410 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 411 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0); 412 #else 413 return internal_syscall(SYSCALL(unlink), (uptr)path); 414 #endif 415 } 416 417 uptr internal_rename(const char *oldpath, const char *newpath) { 418 #if defined(__riscv) 419 return internal_syscall(SYSCALL(renameat2), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 420 (uptr)newpath, 0); 421 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 422 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 423 (uptr)newpath); 424 #else 425 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath); 426 #endif 427 } 428 429 uptr internal_sched_yield() { 430 return internal_syscall(SYSCALL(sched_yield)); 431 } 432 433 unsigned int internal_sleep(unsigned int seconds) { 434 struct timespec ts; 435 ts.tv_sec = seconds; 436 ts.tv_nsec = 0; 437 int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts); 438 if (res) return ts.tv_sec; 439 return 0; 440 } 441 442 uptr internal_execve(const char *filename, char *const argv[], 443 char *const envp[]) { 444 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, 445 (uptr)envp); 446 } 447 #endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 448 449 #if !SANITIZER_NETBSD 450 void internal__exit(int exitcode) { 451 #if SANITIZER_FREEBSD || SANITIZER_SOLARIS 452 internal_syscall(SYSCALL(exit), exitcode); 453 #else 454 internal_syscall(SYSCALL(exit_group), exitcode); 455 #endif 456 Die(); // Unreachable. 457 } 458 #endif // !SANITIZER_NETBSD 459 460 // ----------------- sanitizer_common.h 461 bool FileExists(const char *filename) { 462 if (ShouldMockFailureToOpen(filename)) 463 return false; 464 struct stat st; 465 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 466 if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0)) 467 #else 468 if (internal_stat(filename, &st)) 469 #endif 470 return false; 471 // Sanity check: filename is a regular file. 472 return S_ISREG(st.st_mode); 473 } 474 475 #if !SANITIZER_NETBSD 476 tid_t GetTid() { 477 #if SANITIZER_FREEBSD 478 long Tid; 479 thr_self(&Tid); 480 return Tid; 481 #elif SANITIZER_SOLARIS 482 return thr_self(); 483 #else 484 return internal_syscall(SYSCALL(gettid)); 485 #endif 486 } 487 488 int TgKill(pid_t pid, tid_t tid, int sig) { 489 #if SANITIZER_LINUX 490 return internal_syscall(SYSCALL(tgkill), pid, tid, sig); 491 #elif SANITIZER_FREEBSD 492 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig); 493 #elif SANITIZER_SOLARIS 494 (void)pid; 495 return thr_kill(tid, sig); 496 #endif 497 } 498 #endif 499 500 #if SANITIZER_GLIBC 501 u64 NanoTime() { 502 kernel_timeval tv; 503 internal_memset(&tv, 0, sizeof(tv)); 504 internal_syscall(SYSCALL(gettimeofday), &tv, 0); 505 return (u64)tv.tv_sec * 1000 * 1000 * 1000 + tv.tv_usec * 1000; 506 } 507 // Used by real_clock_gettime. 508 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) { 509 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp); 510 } 511 #elif !SANITIZER_SOLARIS && !SANITIZER_NETBSD 512 u64 NanoTime() { 513 struct timespec ts; 514 clock_gettime(CLOCK_REALTIME, &ts); 515 return (u64)ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec; 516 } 517 #endif 518 519 // Like getenv, but reads env directly from /proc (on Linux) or parses the 520 // 'environ' array (on some others) and does not use libc. This function 521 // should be called first inside __asan_init. 522 const char *GetEnv(const char *name) { 523 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_SOLARIS 524 if (::environ != 0) { 525 uptr NameLen = internal_strlen(name); 526 for (char **Env = ::environ; *Env != 0; Env++) { 527 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=') 528 return (*Env) + NameLen + 1; 529 } 530 } 531 return 0; // Not found. 532 #elif SANITIZER_LINUX 533 static char *environ; 534 static uptr len; 535 static bool inited; 536 if (!inited) { 537 inited = true; 538 uptr environ_size; 539 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len)) 540 environ = nullptr; 541 } 542 if (!environ || len == 0) return nullptr; 543 uptr namelen = internal_strlen(name); 544 const char *p = environ; 545 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 546 // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 547 const char* endp = 548 (char*)internal_memchr(p, '\0', len - (p - environ)); 549 if (!endp) // this entry isn't NUL terminated 550 return nullptr; 551 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 552 return p + namelen + 1; // point after = 553 p = endp + 1; 554 } 555 return nullptr; // Not found. 556 #else 557 #error "Unsupported platform" 558 #endif 559 } 560 561 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_GO 562 extern "C" { 563 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 564 } 565 #endif 566 567 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 568 static void ReadNullSepFileToArray(const char *path, char ***arr, 569 int arr_size) { 570 char *buff; 571 uptr buff_size; 572 uptr buff_len; 573 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 574 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 575 (*arr)[0] = nullptr; 576 return; 577 } 578 (*arr)[0] = buff; 579 int count, i; 580 for (count = 1, i = 1; ; i++) { 581 if (buff[i] == 0) { 582 if (buff[i+1] == 0) break; 583 (*arr)[count] = &buff[i+1]; 584 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 585 count++; 586 } 587 } 588 (*arr)[count] = nullptr; 589 } 590 #endif 591 592 static void GetArgsAndEnv(char ***argv, char ***envp) { 593 #if SANITIZER_FREEBSD 594 // On FreeBSD, retrieving the argument and environment arrays is done via the 595 // kern.ps_strings sysctl, which returns a pointer to a structure containing 596 // this information. See also <sys/exec.h>. 597 ps_strings *pss; 598 uptr sz = sizeof(pss); 599 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 600 Printf("sysctl kern.ps_strings failed\n"); 601 Die(); 602 } 603 *argv = pss->ps_argvstr; 604 *envp = pss->ps_envstr; 605 #elif SANITIZER_NETBSD 606 *argv = __ps_strings->ps_argvstr; 607 *envp = __ps_strings->ps_envstr; 608 #else // SANITIZER_FREEBSD 609 #if !SANITIZER_GO 610 if (&__libc_stack_end) { 611 uptr* stack_end = (uptr*)__libc_stack_end; 612 // Normally argc can be obtained from *stack_end, however, on ARM glibc's 613 // _start clobbers it: 614 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/start.S;hb=refs/heads/release/2.31/master#l75 615 // Do not special-case ARM and infer argc from argv everywhere. 616 int argc = 0; 617 while (stack_end[argc + 1]) argc++; 618 *argv = (char**)(stack_end + 1); 619 *envp = (char**)(stack_end + argc + 2); 620 } else { 621 #endif // !SANITIZER_GO 622 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 623 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 624 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 625 #if !SANITIZER_GO 626 } 627 #endif // !SANITIZER_GO 628 #endif // SANITIZER_FREEBSD 629 } 630 631 char **GetArgv() { 632 char **argv, **envp; 633 GetArgsAndEnv(&argv, &envp); 634 return argv; 635 } 636 637 char **GetEnviron() { 638 char **argv, **envp; 639 GetArgsAndEnv(&argv, &envp); 640 return envp; 641 } 642 643 #if !SANITIZER_SOLARIS 644 enum MutexState { 645 MtxUnlocked = 0, 646 MtxLocked = 1, 647 MtxSleeping = 2 648 }; 649 650 BlockingMutex::BlockingMutex() { 651 internal_memset(this, 0, sizeof(*this)); 652 } 653 654 void BlockingMutex::Lock() { 655 CHECK_EQ(owner_, 0); 656 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 657 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked) 658 return; 659 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) { 660 #if SANITIZER_FREEBSD 661 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0); 662 #elif SANITIZER_NETBSD 663 sched_yield(); /* No userspace futex-like synchronization */ 664 #else 665 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT_PRIVATE, MtxSleeping, 666 0, 0, 0); 667 #endif 668 } 669 } 670 671 void BlockingMutex::Unlock() { 672 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 673 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release); 674 CHECK_NE(v, MtxUnlocked); 675 if (v == MtxSleeping) { 676 #if SANITIZER_FREEBSD 677 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0); 678 #elif SANITIZER_NETBSD 679 /* No userspace futex-like synchronization */ 680 #else 681 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0); 682 #endif 683 } 684 } 685 686 void BlockingMutex::CheckLocked() { 687 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 688 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed)); 689 } 690 #endif // !SANITIZER_SOLARIS 691 692 // ----------------- sanitizer_linux.h 693 // The actual size of this structure is specified by d_reclen. 694 // Note that getdents64 uses a different structure format. We only provide the 695 // 32-bit syscall here. 696 #if SANITIZER_NETBSD 697 // Not used 698 #else 699 struct linux_dirent { 700 #if SANITIZER_X32 || defined(__aarch64__) || SANITIZER_RISCV64 701 u64 d_ino; 702 u64 d_off; 703 #else 704 unsigned long d_ino; 705 unsigned long d_off; 706 #endif 707 unsigned short d_reclen; 708 #if defined(__aarch64__) || SANITIZER_RISCV64 709 unsigned char d_type; 710 #endif 711 char d_name[256]; 712 }; 713 #endif 714 715 #if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 716 // Syscall wrappers. 717 uptr internal_ptrace(int request, int pid, void *addr, void *data) { 718 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 719 (uptr)data); 720 } 721 722 uptr internal_waitpid(int pid, int *status, int options) { 723 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 724 0 /* rusage */); 725 } 726 727 uptr internal_getpid() { 728 return internal_syscall(SYSCALL(getpid)); 729 } 730 731 uptr internal_getppid() { 732 return internal_syscall(SYSCALL(getppid)); 733 } 734 735 int internal_dlinfo(void *handle, int request, void *p) { 736 #if SANITIZER_FREEBSD 737 return dlinfo(handle, request, p); 738 #else 739 UNIMPLEMENTED(); 740 #endif 741 } 742 743 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 744 #if SANITIZER_FREEBSD 745 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 746 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 747 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 748 #else 749 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 750 #endif 751 } 752 753 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 754 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 755 } 756 757 #if SANITIZER_LINUX 758 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 759 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 760 } 761 #endif 762 763 uptr internal_sigaltstack(const void *ss, void *oss) { 764 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 765 } 766 767 int internal_fork() { 768 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 769 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 770 #else 771 return internal_syscall(SYSCALL(fork)); 772 #endif 773 } 774 775 #if SANITIZER_FREEBSD 776 int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 777 uptr *oldlenp, const void *newp, uptr newlen) { 778 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 779 (size_t *)oldlenp, newp, (size_t)newlen); 780 } 781 782 int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 783 const void *newp, uptr newlen) { 784 // Note: this function can be called during startup, so we need to avoid 785 // calling any interceptable functions. On FreeBSD >= 1300045 sysctlbyname() 786 // is a real syscall, but for older versions it calls sysctlnametomib() 787 // followed by sysctl(). To avoid calling the intercepted version and 788 // asserting if this happens during startup, call the real sysctlnametomib() 789 // followed by internal_sysctl() if the syscall is not available. 790 #ifdef SYS___sysctlbyname 791 return internal_syscall(SYSCALL(__sysctlbyname), sname, 792 internal_strlen(sname), oldp, (size_t *)oldlenp, newp, 793 (size_t)newlen); 794 #else 795 static decltype(sysctlnametomib) *real_sysctlnametomib = nullptr; 796 if (!real_sysctlnametomib) 797 real_sysctlnametomib = 798 (decltype(sysctlnametomib) *)dlsym(RTLD_NEXT, "sysctlnametomib"); 799 CHECK(real_sysctlnametomib); 800 801 int oid[CTL_MAXNAME]; 802 size_t len = CTL_MAXNAME; 803 if (real_sysctlnametomib(sname, oid, &len) == -1) 804 return (-1); 805 return internal_sysctl(oid, len, oldp, oldlenp, newp, newlen); 806 #endif 807 } 808 #endif 809 810 #if SANITIZER_LINUX 811 #define SA_RESTORER 0x04000000 812 // Doesn't set sa_restorer if the caller did not set it, so use with caution 813 //(see below). 814 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 815 __sanitizer_kernel_sigaction_t k_act, k_oldact; 816 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 817 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 818 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 819 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 820 if (u_act) { 821 k_act.handler = u_act->handler; 822 k_act.sigaction = u_act->sigaction; 823 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 824 sizeof(__sanitizer_kernel_sigset_t)); 825 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 826 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 827 // FIXME: most often sa_restorer is unset, however the kernel requires it 828 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 829 // If sa_restorer passed to the kernel is NULL, the program may crash upon 830 // signal delivery or fail to unwind the stack in the signal handler. 831 // libc implementation of sigaction() passes its own restorer to 832 // rt_sigaction, so we need to do the same (we'll need to reimplement the 833 // restorers; for x86_64 the restorer address can be obtained from 834 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 835 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 836 k_act.sa_restorer = u_act->sa_restorer; 837 #endif 838 } 839 840 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 841 (uptr)(u_act ? &k_act : nullptr), 842 (uptr)(u_oldact ? &k_oldact : nullptr), 843 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 844 845 if ((result == 0) && u_oldact) { 846 u_oldact->handler = k_oldact.handler; 847 u_oldact->sigaction = k_oldact.sigaction; 848 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 849 sizeof(__sanitizer_kernel_sigset_t)); 850 u_oldact->sa_flags = k_oldact.sa_flags; 851 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32 852 u_oldact->sa_restorer = k_oldact.sa_restorer; 853 #endif 854 } 855 return result; 856 } 857 #endif // SANITIZER_LINUX 858 859 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 860 __sanitizer_sigset_t *oldset) { 861 #if SANITIZER_FREEBSD 862 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 863 #else 864 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 865 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 866 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, (uptr)k_set, 867 (uptr)k_oldset, sizeof(__sanitizer_kernel_sigset_t)); 868 #endif 869 } 870 871 void internal_sigfillset(__sanitizer_sigset_t *set) { 872 internal_memset(set, 0xff, sizeof(*set)); 873 } 874 875 void internal_sigemptyset(__sanitizer_sigset_t *set) { 876 internal_memset(set, 0, sizeof(*set)); 877 } 878 879 #if SANITIZER_LINUX 880 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 881 signum -= 1; 882 CHECK_GE(signum, 0); 883 CHECK_LT(signum, sizeof(*set) * 8); 884 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 885 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 886 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 887 k_set->sig[idx] &= ~(1 << bit); 888 } 889 890 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 891 signum -= 1; 892 CHECK_GE(signum, 0); 893 CHECK_LT(signum, sizeof(*set) * 8); 894 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 895 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 896 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 897 return k_set->sig[idx] & (1 << bit); 898 } 899 #elif SANITIZER_FREEBSD 900 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 901 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 902 sigdelset(rset, signum); 903 } 904 905 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 906 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 907 return sigismember(rset, signum); 908 } 909 #endif 910 #endif // !SANITIZER_SOLARIS 911 912 #if !SANITIZER_NETBSD 913 // ThreadLister implementation. 914 ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) { 915 char task_directory_path[80]; 916 internal_snprintf(task_directory_path, sizeof(task_directory_path), 917 "/proc/%d/task/", pid); 918 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 919 if (internal_iserror(descriptor_)) { 920 Report("Can't open /proc/%d/task for reading.\n", pid); 921 } 922 } 923 924 ThreadLister::Result ThreadLister::ListThreads( 925 InternalMmapVector<tid_t> *threads) { 926 if (internal_iserror(descriptor_)) 927 return Error; 928 internal_lseek(descriptor_, 0, SEEK_SET); 929 threads->clear(); 930 931 Result result = Ok; 932 for (bool first_read = true;; first_read = false) { 933 // Resize to max capacity if it was downsized by IsAlive. 934 buffer_.resize(buffer_.capacity()); 935 CHECK_GE(buffer_.size(), 4096); 936 uptr read = internal_getdents( 937 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size()); 938 if (!read) 939 return result; 940 if (internal_iserror(read)) { 941 Report("Can't read directory entries from /proc/%d/task.\n", pid_); 942 return Error; 943 } 944 945 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 946 struct linux_dirent *entry = (struct linux_dirent *)begin; 947 begin += entry->d_reclen; 948 if (entry->d_ino == 1) { 949 // Inode 1 is for bad blocks and also can be a reason for early return. 950 // Should be emitted if kernel tried to output terminating thread. 951 // See proc_task_readdir implementation in Linux. 952 result = Incomplete; 953 } 954 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 955 threads->push_back(internal_atoll(entry->d_name)); 956 } 957 958 // Now we are going to detect short-read or early EOF. In such cases Linux 959 // can return inconsistent list with missing alive threads. 960 // Code will just remember that the list can be incomplete but it will 961 // continue reads to return as much as possible. 962 if (!first_read) { 963 // The first one was a short-read by definition. 964 result = Incomplete; 965 } else if (read > buffer_.size() - 1024) { 966 // Read was close to the buffer size. So double the size and assume the 967 // worst. 968 buffer_.resize(buffer_.size() * 2); 969 result = Incomplete; 970 } else if (!threads->empty() && !IsAlive(threads->back())) { 971 // Maybe Linux early returned from read on terminated thread (!pid_alive) 972 // and failed to restore read position. 973 // See next_tid and proc_task_instantiate in Linux. 974 result = Incomplete; 975 } 976 } 977 } 978 979 bool ThreadLister::IsAlive(int tid) { 980 // /proc/%d/task/%d/status uses same call to detect alive threads as 981 // proc_task_readdir. See task_state implementation in Linux. 982 char path[80]; 983 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid); 984 if (!ReadFileToVector(path, &buffer_) || buffer_.empty()) 985 return false; 986 buffer_.push_back(0); 987 static const char kPrefix[] = "\nPPid:"; 988 const char *field = internal_strstr(buffer_.data(), kPrefix); 989 if (!field) 990 return false; 991 field += internal_strlen(kPrefix); 992 return (int)internal_atoll(field) != 0; 993 } 994 995 ThreadLister::~ThreadLister() { 996 if (!internal_iserror(descriptor_)) 997 internal_close(descriptor_); 998 } 999 #endif 1000 1001 #if SANITIZER_WORDSIZE == 32 1002 // Take care of unusable kernel area in top gigabyte. 1003 static uptr GetKernelAreaSize() { 1004 #if SANITIZER_LINUX && !SANITIZER_X32 1005 const uptr gbyte = 1UL << 30; 1006 1007 // Firstly check if there are writable segments 1008 // mapped to top gigabyte (e.g. stack). 1009 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 1010 if (proc_maps.Error()) 1011 return 0; 1012 MemoryMappedSegment segment; 1013 while (proc_maps.Next(&segment)) { 1014 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0; 1015 } 1016 1017 #if !SANITIZER_ANDROID 1018 // Even if nothing is mapped, top Gb may still be accessible 1019 // if we are running on 64-bit kernel. 1020 // Uname may report misleading results if personality type 1021 // is modified (e.g. under schroot) so check this as well. 1022 struct utsname uname_info; 1023 int pers = personality(0xffffffffUL); 1024 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 && 1025 internal_strstr(uname_info.machine, "64")) 1026 return 0; 1027 #endif // SANITIZER_ANDROID 1028 1029 // Top gigabyte is reserved for kernel. 1030 return gbyte; 1031 #else 1032 return 0; 1033 #endif // SANITIZER_LINUX && !SANITIZER_X32 1034 } 1035 #endif // SANITIZER_WORDSIZE == 32 1036 1037 uptr GetMaxVirtualAddress() { 1038 #if SANITIZER_NETBSD && defined(__x86_64__) 1039 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE) 1040 #elif SANITIZER_WORDSIZE == 64 1041 # if defined(__powerpc64__) || defined(__aarch64__) 1042 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 1043 // We somehow need to figure out which one we are using now and choose 1044 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 1045 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 1046 // of the address space, so simply checking the stack address is not enough. 1047 // This should (does) work for both PowerPC64 Endian modes. 1048 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit. 1049 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1; 1050 #elif SANITIZER_RISCV64 1051 return (1ULL << 38) - 1; 1052 # elif defined(__mips64) 1053 return (1ULL << 40) - 1; // 0x000000ffffffffffUL; 1054 # elif defined(__s390x__) 1055 return (1ULL << 53) - 1; // 0x001fffffffffffffUL; 1056 #elif defined(__sparc__) 1057 return ~(uptr)0; 1058 # else 1059 return (1ULL << 47) - 1; // 0x00007fffffffffffUL; 1060 # endif 1061 #else // SANITIZER_WORDSIZE == 32 1062 # if defined(__s390__) 1063 return (1ULL << 31) - 1; // 0x7fffffff; 1064 # else 1065 return (1ULL << 32) - 1; // 0xffffffff; 1066 # endif 1067 #endif // SANITIZER_WORDSIZE 1068 } 1069 1070 uptr GetMaxUserVirtualAddress() { 1071 uptr addr = GetMaxVirtualAddress(); 1072 #if SANITIZER_WORDSIZE == 32 && !defined(__s390__) 1073 if (!common_flags()->full_address_space) 1074 addr -= GetKernelAreaSize(); 1075 CHECK_LT(reinterpret_cast<uptr>(&addr), addr); 1076 #endif 1077 return addr; 1078 } 1079 1080 #if !SANITIZER_ANDROID 1081 uptr GetPageSize() { 1082 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) && \ 1083 defined(EXEC_PAGESIZE) 1084 return EXEC_PAGESIZE; 1085 #elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1086 // Use sysctl as sysconf can trigger interceptors internally. 1087 int pz = 0; 1088 uptr pzl = sizeof(pz); 1089 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1090 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1091 CHECK_EQ(rv, 0); 1092 return (uptr)pz; 1093 #elif SANITIZER_USE_GETAUXVAL 1094 return getauxval(AT_PAGESZ); 1095 #else 1096 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1097 #endif 1098 } 1099 #endif // !SANITIZER_ANDROID 1100 1101 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { 1102 #if SANITIZER_SOLARIS 1103 const char *default_module_name = getexecname(); 1104 CHECK_NE(default_module_name, NULL); 1105 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1106 #else 1107 #if SANITIZER_FREEBSD || SANITIZER_NETBSD 1108 #if SANITIZER_FREEBSD 1109 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1110 #else 1111 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1112 #endif 1113 const char *default_module_name = "kern.proc.pathname"; 1114 uptr Size = buf_len; 1115 bool IsErr = 1116 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1117 int readlink_error = IsErr ? errno : 0; 1118 uptr module_name_len = Size; 1119 #else 1120 const char *default_module_name = "/proc/self/exe"; 1121 uptr module_name_len = internal_readlink( 1122 default_module_name, buf, buf_len); 1123 int readlink_error; 1124 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1125 #endif // SANITIZER_SOLARIS 1126 if (IsErr) { 1127 // We can't read binary name for some reason, assume it's unknown. 1128 Report("WARNING: reading executable name failed with errno %d, " 1129 "some stack frames may not be symbolized\n", readlink_error); 1130 module_name_len = internal_snprintf(buf, buf_len, "%s", 1131 default_module_name); 1132 CHECK_LT(module_name_len, buf_len); 1133 } 1134 return module_name_len; 1135 #endif 1136 } 1137 1138 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1139 #if SANITIZER_LINUX 1140 char *tmpbuf; 1141 uptr tmpsize; 1142 uptr tmplen; 1143 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1144 1024 * 1024)) { 1145 internal_strncpy(buf, tmpbuf, buf_len); 1146 UnmapOrDie(tmpbuf, tmpsize); 1147 return internal_strlen(buf); 1148 } 1149 #endif 1150 return ReadBinaryName(buf, buf_len); 1151 } 1152 1153 // Match full names of the form /path/to/base_name{-,.}* 1154 bool LibraryNameIs(const char *full_name, const char *base_name) { 1155 const char *name = full_name; 1156 // Strip path. 1157 while (*name != '\0') name++; 1158 while (name > full_name && *name != '/') name--; 1159 if (*name == '/') name++; 1160 uptr base_name_length = internal_strlen(base_name); 1161 if (internal_strncmp(name, base_name, base_name_length)) return false; 1162 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1163 } 1164 1165 #if !SANITIZER_ANDROID 1166 // Call cb for each region mapped by map. 1167 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1168 CHECK_NE(map, nullptr); 1169 #if !SANITIZER_FREEBSD 1170 typedef ElfW(Phdr) Elf_Phdr; 1171 typedef ElfW(Ehdr) Elf_Ehdr; 1172 #endif // !SANITIZER_FREEBSD 1173 char *base = (char *)map->l_addr; 1174 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1175 char *phdrs = base + ehdr->e_phoff; 1176 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1177 1178 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1179 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1180 // objects have a non-zero base. 1181 uptr preferred_base = (uptr)-1; 1182 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1183 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1184 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1185 preferred_base = (uptr)phdr->p_vaddr; 1186 } 1187 1188 // Compute the delta from the real base to get a relocation delta. 1189 sptr delta = (uptr)base - preferred_base; 1190 // Now we can figure out what the loader really mapped. 1191 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1192 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1193 if (phdr->p_type == PT_LOAD) { 1194 uptr seg_start = phdr->p_vaddr + delta; 1195 uptr seg_end = seg_start + phdr->p_memsz; 1196 // None of these values are aligned. We consider the ragged edges of the 1197 // load command as defined, since they are mapped from the file. 1198 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1199 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1200 cb((void *)seg_start, seg_end - seg_start); 1201 } 1202 } 1203 } 1204 #endif 1205 1206 #if defined(__x86_64__) && SANITIZER_LINUX 1207 // We cannot use glibc's clone wrapper, because it messes with the child 1208 // task's TLS. It writes the PID and TID of the child task to its thread 1209 // descriptor, but in our case the child task shares the thread descriptor with 1210 // the parent (because we don't know how to allocate a new thread 1211 // descriptor to keep glibc happy). So the stock version of clone(), when 1212 // used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1213 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1214 int *parent_tidptr, void *newtls, int *child_tidptr) { 1215 long long res; 1216 if (!fn || !child_stack) 1217 return -EINVAL; 1218 CHECK_EQ(0, (uptr)child_stack % 16); 1219 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1220 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1221 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1222 register void *r8 __asm__("r8") = newtls; 1223 register int *r10 __asm__("r10") = child_tidptr; 1224 __asm__ __volatile__( 1225 /* %rax = syscall(%rax = SYSCALL(clone), 1226 * %rdi = flags, 1227 * %rsi = child_stack, 1228 * %rdx = parent_tidptr, 1229 * %r8 = new_tls, 1230 * %r10 = child_tidptr) 1231 */ 1232 "syscall\n" 1233 1234 /* if (%rax != 0) 1235 * return; 1236 */ 1237 "testq %%rax,%%rax\n" 1238 "jnz 1f\n" 1239 1240 /* In the child. Terminate unwind chain. */ 1241 // XXX: We should also terminate the CFI unwind chain 1242 // here. Unfortunately clang 3.2 doesn't support the 1243 // necessary CFI directives, so we skip that part. 1244 "xorq %%rbp,%%rbp\n" 1245 1246 /* Call "fn(arg)". */ 1247 "popq %%rax\n" 1248 "popq %%rdi\n" 1249 "call *%%rax\n" 1250 1251 /* Call _exit(%rax). */ 1252 "movq %%rax,%%rdi\n" 1253 "movq %2,%%rax\n" 1254 "syscall\n" 1255 1256 /* Return to parent. */ 1257 "1:\n" 1258 : "=a" (res) 1259 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1260 "S"(child_stack), 1261 "D"(flags), 1262 "d"(parent_tidptr), 1263 "r"(r8), 1264 "r"(r10) 1265 : "memory", "r11", "rcx"); 1266 return res; 1267 } 1268 #elif defined(__mips__) 1269 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1270 int *parent_tidptr, void *newtls, int *child_tidptr) { 1271 long long res; 1272 if (!fn || !child_stack) 1273 return -EINVAL; 1274 CHECK_EQ(0, (uptr)child_stack % 16); 1275 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1276 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1277 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1278 register void *a3 __asm__("$7") = newtls; 1279 register int *a4 __asm__("$8") = child_tidptr; 1280 // We don't have proper CFI directives here because it requires alot of code 1281 // for very marginal benefits. 1282 __asm__ __volatile__( 1283 /* $v0 = syscall($v0 = __NR_clone, 1284 * $a0 = flags, 1285 * $a1 = child_stack, 1286 * $a2 = parent_tidptr, 1287 * $a3 = new_tls, 1288 * $a4 = child_tidptr) 1289 */ 1290 ".cprestore 16;\n" 1291 "move $4,%1;\n" 1292 "move $5,%2;\n" 1293 "move $6,%3;\n" 1294 "move $7,%4;\n" 1295 /* Store the fifth argument on stack 1296 * if we are using 32-bit abi. 1297 */ 1298 #if SANITIZER_WORDSIZE == 32 1299 "lw %5,16($29);\n" 1300 #else 1301 "move $8,%5;\n" 1302 #endif 1303 "li $2,%6;\n" 1304 "syscall;\n" 1305 1306 /* if ($v0 != 0) 1307 * return; 1308 */ 1309 "bnez $2,1f;\n" 1310 1311 /* Call "fn(arg)". */ 1312 #if SANITIZER_WORDSIZE == 32 1313 #ifdef __BIG_ENDIAN__ 1314 "lw $25,4($29);\n" 1315 "lw $4,12($29);\n" 1316 #else 1317 "lw $25,0($29);\n" 1318 "lw $4,8($29);\n" 1319 #endif 1320 #else 1321 "ld $25,0($29);\n" 1322 "ld $4,8($29);\n" 1323 #endif 1324 "jal $25;\n" 1325 1326 /* Call _exit($v0). */ 1327 "move $4,$2;\n" 1328 "li $2,%7;\n" 1329 "syscall;\n" 1330 1331 /* Return to parent. */ 1332 "1:\n" 1333 : "=r" (res) 1334 : "r"(flags), 1335 "r"(child_stack), 1336 "r"(parent_tidptr), 1337 "r"(a3), 1338 "r"(a4), 1339 "i"(__NR_clone), 1340 "i"(__NR_exit) 1341 : "memory", "$29" ); 1342 return res; 1343 } 1344 #elif SANITIZER_RISCV64 1345 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1346 int *parent_tidptr, void *newtls, int *child_tidptr) { 1347 if (!fn || !child_stack) 1348 return -EINVAL; 1349 1350 CHECK_EQ(0, (uptr)child_stack % 16); 1351 1352 register int res __asm__("a0"); 1353 register int __flags __asm__("a0") = flags; 1354 register void *__stack __asm__("a1") = child_stack; 1355 register int *__ptid __asm__("a2") = parent_tidptr; 1356 register void *__tls __asm__("a3") = newtls; 1357 register int *__ctid __asm__("a4") = child_tidptr; 1358 register int (*__fn)(void *) __asm__("a5") = fn; 1359 register void *__arg __asm__("a6") = arg; 1360 register int nr_clone __asm__("a7") = __NR_clone; 1361 1362 __asm__ __volatile__( 1363 "ecall\n" 1364 1365 /* if (a0 != 0) 1366 * return a0; 1367 */ 1368 "bnez a0, 1f\n" 1369 1370 // In the child, now. Call "fn(arg)". 1371 "mv a0, a6\n" 1372 "jalr a5\n" 1373 1374 // Call _exit(a0). 1375 "addi a7, zero, %9\n" 1376 "ecall\n" 1377 "1:\n" 1378 1379 : "=r"(res) 1380 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__tls), "r"(__ctid), 1381 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit) 1382 : "memory"); 1383 return res; 1384 } 1385 #elif defined(__aarch64__) 1386 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1387 int *parent_tidptr, void *newtls, int *child_tidptr) { 1388 long long res; 1389 if (!fn || !child_stack) 1390 return -EINVAL; 1391 CHECK_EQ(0, (uptr)child_stack % 16); 1392 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1393 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1394 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1395 1396 register int (*__fn)(void *) __asm__("x0") = fn; 1397 register void *__stack __asm__("x1") = child_stack; 1398 register int __flags __asm__("x2") = flags; 1399 register void *__arg __asm__("x3") = arg; 1400 register int *__ptid __asm__("x4") = parent_tidptr; 1401 register void *__tls __asm__("x5") = newtls; 1402 register int *__ctid __asm__("x6") = child_tidptr; 1403 1404 __asm__ __volatile__( 1405 "mov x0,x2\n" /* flags */ 1406 "mov x2,x4\n" /* ptid */ 1407 "mov x3,x5\n" /* tls */ 1408 "mov x4,x6\n" /* ctid */ 1409 "mov x8,%9\n" /* clone */ 1410 1411 "svc 0x0\n" 1412 1413 /* if (%r0 != 0) 1414 * return %r0; 1415 */ 1416 "cmp x0, #0\n" 1417 "bne 1f\n" 1418 1419 /* In the child, now. Call "fn(arg)". */ 1420 "ldp x1, x0, [sp], #16\n" 1421 "blr x1\n" 1422 1423 /* Call _exit(%r0). */ 1424 "mov x8, %10\n" 1425 "svc 0x0\n" 1426 "1:\n" 1427 1428 : "=r" (res) 1429 : "i"(-EINVAL), 1430 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1431 "r"(__ptid), "r"(__tls), "r"(__ctid), 1432 "i"(__NR_clone), "i"(__NR_exit) 1433 : "x30", "memory"); 1434 return res; 1435 } 1436 #elif defined(__powerpc64__) 1437 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1438 int *parent_tidptr, void *newtls, int *child_tidptr) { 1439 long long res; 1440 // Stack frame structure. 1441 #if SANITIZER_PPC64V1 1442 // Back chain == 0 (SP + 112) 1443 // Frame (112 bytes): 1444 // Parameter save area (SP + 48), 8 doublewords 1445 // TOC save area (SP + 40) 1446 // Link editor doubleword (SP + 32) 1447 // Compiler doubleword (SP + 24) 1448 // LR save area (SP + 16) 1449 // CR save area (SP + 8) 1450 // Back chain (SP + 0) 1451 # define FRAME_SIZE 112 1452 # define FRAME_TOC_SAVE_OFFSET 40 1453 #elif SANITIZER_PPC64V2 1454 // Back chain == 0 (SP + 32) 1455 // Frame (32 bytes): 1456 // TOC save area (SP + 24) 1457 // LR save area (SP + 16) 1458 // CR save area (SP + 8) 1459 // Back chain (SP + 0) 1460 # define FRAME_SIZE 32 1461 # define FRAME_TOC_SAVE_OFFSET 24 1462 #else 1463 # error "Unsupported PPC64 ABI" 1464 #endif 1465 if (!fn || !child_stack) 1466 return -EINVAL; 1467 CHECK_EQ(0, (uptr)child_stack % 16); 1468 1469 register int (*__fn)(void *) __asm__("r3") = fn; 1470 register void *__cstack __asm__("r4") = child_stack; 1471 register int __flags __asm__("r5") = flags; 1472 register void *__arg __asm__("r6") = arg; 1473 register int *__ptidptr __asm__("r7") = parent_tidptr; 1474 register void *__newtls __asm__("r8") = newtls; 1475 register int *__ctidptr __asm__("r9") = child_tidptr; 1476 1477 __asm__ __volatile__( 1478 /* fn and arg are saved across the syscall */ 1479 "mr 28, %5\n\t" 1480 "mr 27, %8\n\t" 1481 1482 /* syscall 1483 r0 == __NR_clone 1484 r3 == flags 1485 r4 == child_stack 1486 r5 == parent_tidptr 1487 r6 == newtls 1488 r7 == child_tidptr */ 1489 "mr 3, %7\n\t" 1490 "mr 5, %9\n\t" 1491 "mr 6, %10\n\t" 1492 "mr 7, %11\n\t" 1493 "li 0, %3\n\t" 1494 "sc\n\t" 1495 1496 /* Test if syscall was successful */ 1497 "cmpdi cr1, 3, 0\n\t" 1498 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1499 "bne- cr1, 1f\n\t" 1500 1501 /* Set up stack frame */ 1502 "li 29, 0\n\t" 1503 "stdu 29, -8(1)\n\t" 1504 "stdu 1, -%12(1)\n\t" 1505 /* Do the function call */ 1506 "std 2, %13(1)\n\t" 1507 #if SANITIZER_PPC64V1 1508 "ld 0, 0(28)\n\t" 1509 "ld 2, 8(28)\n\t" 1510 "mtctr 0\n\t" 1511 #elif SANITIZER_PPC64V2 1512 "mr 12, 28\n\t" 1513 "mtctr 12\n\t" 1514 #else 1515 # error "Unsupported PPC64 ABI" 1516 #endif 1517 "mr 3, 27\n\t" 1518 "bctrl\n\t" 1519 "ld 2, %13(1)\n\t" 1520 1521 /* Call _exit(r3) */ 1522 "li 0, %4\n\t" 1523 "sc\n\t" 1524 1525 /* Return to parent */ 1526 "1:\n\t" 1527 "mr %0, 3\n\t" 1528 : "=r" (res) 1529 : "0" (-1), 1530 "i" (EINVAL), 1531 "i" (__NR_clone), 1532 "i" (__NR_exit), 1533 "r" (__fn), 1534 "r" (__cstack), 1535 "r" (__flags), 1536 "r" (__arg), 1537 "r" (__ptidptr), 1538 "r" (__newtls), 1539 "r" (__ctidptr), 1540 "i" (FRAME_SIZE), 1541 "i" (FRAME_TOC_SAVE_OFFSET) 1542 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1543 return res; 1544 } 1545 #elif defined(__i386__) && SANITIZER_LINUX 1546 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1547 int *parent_tidptr, void *newtls, int *child_tidptr) { 1548 int res; 1549 if (!fn || !child_stack) 1550 return -EINVAL; 1551 CHECK_EQ(0, (uptr)child_stack % 16); 1552 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1553 ((unsigned int *)child_stack)[0] = (uptr)flags; 1554 ((unsigned int *)child_stack)[1] = (uptr)0; 1555 ((unsigned int *)child_stack)[2] = (uptr)fn; 1556 ((unsigned int *)child_stack)[3] = (uptr)arg; 1557 __asm__ __volatile__( 1558 /* %eax = syscall(%eax = SYSCALL(clone), 1559 * %ebx = flags, 1560 * %ecx = child_stack, 1561 * %edx = parent_tidptr, 1562 * %esi = new_tls, 1563 * %edi = child_tidptr) 1564 */ 1565 1566 /* Obtain flags */ 1567 "movl (%%ecx), %%ebx\n" 1568 /* Do the system call */ 1569 "pushl %%ebx\n" 1570 "pushl %%esi\n" 1571 "pushl %%edi\n" 1572 /* Remember the flag value. */ 1573 "movl %%ebx, (%%ecx)\n" 1574 "int $0x80\n" 1575 "popl %%edi\n" 1576 "popl %%esi\n" 1577 "popl %%ebx\n" 1578 1579 /* if (%eax != 0) 1580 * return; 1581 */ 1582 1583 "test %%eax,%%eax\n" 1584 "jnz 1f\n" 1585 1586 /* terminate the stack frame */ 1587 "xorl %%ebp,%%ebp\n" 1588 /* Call FN. */ 1589 "call *%%ebx\n" 1590 #ifdef PIC 1591 "call here\n" 1592 "here:\n" 1593 "popl %%ebx\n" 1594 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1595 #endif 1596 /* Call exit */ 1597 "movl %%eax, %%ebx\n" 1598 "movl %2, %%eax\n" 1599 "int $0x80\n" 1600 "1:\n" 1601 : "=a" (res) 1602 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1603 "c"(child_stack), 1604 "d"(parent_tidptr), 1605 "S"(newtls), 1606 "D"(child_tidptr) 1607 : "memory"); 1608 return res; 1609 } 1610 #elif defined(__arm__) && SANITIZER_LINUX 1611 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1612 int *parent_tidptr, void *newtls, int *child_tidptr) { 1613 unsigned int res; 1614 if (!fn || !child_stack) 1615 return -EINVAL; 1616 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1617 ((unsigned int *)child_stack)[0] = (uptr)fn; 1618 ((unsigned int *)child_stack)[1] = (uptr)arg; 1619 register int r0 __asm__("r0") = flags; 1620 register void *r1 __asm__("r1") = child_stack; 1621 register int *r2 __asm__("r2") = parent_tidptr; 1622 register void *r3 __asm__("r3") = newtls; 1623 register int *r4 __asm__("r4") = child_tidptr; 1624 register int r7 __asm__("r7") = __NR_clone; 1625 1626 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) 1627 # define ARCH_HAS_BX 1628 #endif 1629 #if __ARM_ARCH > 4 1630 # define ARCH_HAS_BLX 1631 #endif 1632 1633 #ifdef ARCH_HAS_BX 1634 # ifdef ARCH_HAS_BLX 1635 # define BLX(R) "blx " #R "\n" 1636 # else 1637 # define BLX(R) "mov lr, pc; bx " #R "\n" 1638 # endif 1639 #else 1640 # define BLX(R) "mov lr, pc; mov pc," #R "\n" 1641 #endif 1642 1643 __asm__ __volatile__( 1644 /* %r0 = syscall(%r7 = SYSCALL(clone), 1645 * %r0 = flags, 1646 * %r1 = child_stack, 1647 * %r2 = parent_tidptr, 1648 * %r3 = new_tls, 1649 * %r4 = child_tidptr) 1650 */ 1651 1652 /* Do the system call */ 1653 "swi 0x0\n" 1654 1655 /* if (%r0 != 0) 1656 * return %r0; 1657 */ 1658 "cmp r0, #0\n" 1659 "bne 1f\n" 1660 1661 /* In the child, now. Call "fn(arg)". */ 1662 "ldr r0, [sp, #4]\n" 1663 "ldr ip, [sp], #8\n" 1664 BLX(ip) 1665 /* Call _exit(%r0). */ 1666 "mov r7, %7\n" 1667 "swi 0x0\n" 1668 "1:\n" 1669 "mov %0, r0\n" 1670 : "=r"(res) 1671 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), 1672 "i"(__NR_exit) 1673 : "memory"); 1674 return res; 1675 } 1676 #endif // defined(__x86_64__) && SANITIZER_LINUX 1677 1678 #if SANITIZER_LINUX 1679 int internal_uname(struct utsname *buf) { 1680 return internal_syscall(SYSCALL(uname), buf); 1681 } 1682 #endif 1683 1684 #if SANITIZER_ANDROID 1685 #if __ANDROID_API__ < 21 1686 extern "C" __attribute__((weak)) int dl_iterate_phdr( 1687 int (*)(struct dl_phdr_info *, size_t, void *), void *); 1688 #endif 1689 1690 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, 1691 void *data) { 1692 // Any name starting with "lib" indicates a bug in L where library base names 1693 // are returned instead of paths. 1694 if (info->dlpi_name && info->dlpi_name[0] == 'l' && 1695 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { 1696 *(bool *)data = true; 1697 return 1; 1698 } 1699 return 0; 1700 } 1701 1702 static atomic_uint32_t android_api_level; 1703 1704 static AndroidApiLevel AndroidDetectApiLevelStatic() { 1705 #if __ANDROID_API__ <= 19 1706 return ANDROID_KITKAT; 1707 #elif __ANDROID_API__ <= 22 1708 return ANDROID_LOLLIPOP_MR1; 1709 #else 1710 return ANDROID_POST_LOLLIPOP; 1711 #endif 1712 } 1713 1714 static AndroidApiLevel AndroidDetectApiLevel() { 1715 if (!&dl_iterate_phdr) 1716 return ANDROID_KITKAT; // K or lower 1717 bool base_name_seen = false; 1718 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); 1719 if (base_name_seen) 1720 return ANDROID_LOLLIPOP_MR1; // L MR1 1721 return ANDROID_POST_LOLLIPOP; // post-L 1722 // Plain L (API level 21) is completely broken wrt ASan and not very 1723 // interesting to detect. 1724 } 1725 1726 extern "C" __attribute__((weak)) void* _DYNAMIC; 1727 1728 AndroidApiLevel AndroidGetApiLevel() { 1729 AndroidApiLevel level = 1730 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); 1731 if (level) return level; 1732 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic() 1733 : AndroidDetectApiLevel(); 1734 atomic_store(&android_api_level, level, memory_order_relaxed); 1735 return level; 1736 } 1737 1738 #endif 1739 1740 static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1741 switch (signum) { 1742 case SIGABRT: 1743 return common_flags()->handle_abort; 1744 case SIGILL: 1745 return common_flags()->handle_sigill; 1746 case SIGTRAP: 1747 return common_flags()->handle_sigtrap; 1748 case SIGFPE: 1749 return common_flags()->handle_sigfpe; 1750 case SIGSEGV: 1751 return common_flags()->handle_segv; 1752 case SIGBUS: 1753 return common_flags()->handle_sigbus; 1754 } 1755 return kHandleSignalNo; 1756 } 1757 1758 HandleSignalMode GetHandleSignalMode(int signum) { 1759 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1760 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1761 return kHandleSignalExclusive; 1762 return result; 1763 } 1764 1765 #if !SANITIZER_GO 1766 void *internal_start_thread(void *(*func)(void *arg), void *arg) { 1767 // Start the thread with signals blocked, otherwise it can steal user signals. 1768 __sanitizer_sigset_t set, old; 1769 internal_sigfillset(&set); 1770 #if SANITIZER_LINUX && !SANITIZER_ANDROID 1771 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 1772 // on any thread, setuid call hangs (see test/tsan/setuid.c). 1773 internal_sigdelset(&set, 33); 1774 #endif 1775 internal_sigprocmask(SIG_SETMASK, &set, &old); 1776 void *th; 1777 real_pthread_create(&th, nullptr, func, arg); 1778 internal_sigprocmask(SIG_SETMASK, &old, nullptr); 1779 return th; 1780 } 1781 1782 void internal_join_thread(void *th) { 1783 real_pthread_join(th, nullptr); 1784 } 1785 #else 1786 void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; } 1787 1788 void internal_join_thread(void *th) {} 1789 #endif 1790 1791 #if defined(__aarch64__) 1792 // Android headers in the older NDK releases miss this definition. 1793 struct __sanitizer_esr_context { 1794 struct _aarch64_ctx head; 1795 uint64_t esr; 1796 }; 1797 1798 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1799 static const u32 kEsrMagic = 0x45535201; 1800 u8 *aux = ucontext->uc_mcontext.__reserved; 1801 while (true) { 1802 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1803 if (ctx->size == 0) break; 1804 if (ctx->magic == kEsrMagic) { 1805 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1806 return true; 1807 } 1808 aux += ctx->size; 1809 } 1810 return false; 1811 } 1812 #endif 1813 1814 using Context = ucontext_t; 1815 1816 SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1817 Context *ucontext = (Context *)context; 1818 #if defined(__x86_64__) || defined(__i386__) 1819 static const uptr PF_WRITE = 1U << 1; 1820 #if SANITIZER_FREEBSD 1821 uptr err = ucontext->uc_mcontext.mc_err; 1822 #elif SANITIZER_NETBSD 1823 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1824 #elif SANITIZER_SOLARIS && defined(__i386__) 1825 const int Err = 13; 1826 uptr err = ucontext->uc_mcontext.gregs[Err]; 1827 #else 1828 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1829 #endif // SANITIZER_FREEBSD 1830 return err & PF_WRITE ? WRITE : READ; 1831 #elif defined(__mips__) 1832 uint32_t *exception_source; 1833 uint32_t faulty_instruction; 1834 uint32_t op_code; 1835 1836 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 1837 faulty_instruction = (uint32_t)(*exception_source); 1838 1839 op_code = (faulty_instruction >> 26) & 0x3f; 1840 1841 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 1842 switch (op_code) { 1843 case 0x28: // sb 1844 case 0x29: // sh 1845 case 0x2b: // sw 1846 case 0x3f: // sd 1847 #if __mips_isa_rev < 6 1848 case 0x2c: // sdl 1849 case 0x2d: // sdr 1850 case 0x2a: // swl 1851 case 0x2e: // swr 1852 #endif 1853 return SignalContext::WRITE; 1854 1855 case 0x20: // lb 1856 case 0x24: // lbu 1857 case 0x21: // lh 1858 case 0x25: // lhu 1859 case 0x23: // lw 1860 case 0x27: // lwu 1861 case 0x37: // ld 1862 #if __mips_isa_rev < 6 1863 case 0x1a: // ldl 1864 case 0x1b: // ldr 1865 case 0x22: // lwl 1866 case 0x26: // lwr 1867 #endif 1868 return SignalContext::READ; 1869 #if __mips_isa_rev == 6 1870 case 0x3b: // pcrel 1871 op_code = (faulty_instruction >> 19) & 0x3; 1872 switch (op_code) { 1873 case 0x1: // lwpc 1874 case 0x2: // lwupc 1875 return SignalContext::READ; 1876 } 1877 #endif 1878 } 1879 return SignalContext::UNKNOWN; 1880 #elif defined(__arm__) 1881 static const uptr FSR_WRITE = 1U << 11; 1882 uptr fsr = ucontext->uc_mcontext.error_code; 1883 return fsr & FSR_WRITE ? WRITE : READ; 1884 #elif defined(__aarch64__) 1885 static const u64 ESR_ELx_WNR = 1U << 6; 1886 u64 esr; 1887 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN; 1888 return esr & ESR_ELx_WNR ? WRITE : READ; 1889 #elif defined(__sparc__) 1890 // Decode the instruction to determine the access type. 1891 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 1892 #if SANITIZER_SOLARIS 1893 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 1894 #else 1895 // Historical BSDism here. 1896 struct sigcontext *scontext = (struct sigcontext *)context; 1897 #if defined(__arch64__) 1898 uptr pc = scontext->sigc_regs.tpc; 1899 #else 1900 uptr pc = scontext->si_regs.pc; 1901 #endif 1902 #endif 1903 u32 instr = *(u32 *)pc; 1904 return (instr >> 21) & 1 ? WRITE: READ; 1905 #elif defined(__riscv) 1906 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC]; 1907 unsigned faulty_instruction = *(uint16_t *)pc; 1908 1909 #if defined(__riscv_compressed) 1910 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction 1911 // set op_bits to the instruction bits [1, 0, 15, 14, 13] 1912 unsigned op_bits = 1913 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13); 1914 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive 1915 switch (op_bits) { 1916 case 0b10'010: // c.lwsp (rd != x0) 1917 #if __riscv_xlen == 64 1918 case 0b10'011: // c.ldsp (rd != x0) 1919 #endif 1920 return rd ? SignalContext::READ : SignalContext::UNKNOWN; 1921 case 0b00'010: // c.lw 1922 #if __riscv_flen >= 32 && __riscv_xlen == 32 1923 case 0b10'011: // c.flwsp 1924 #endif 1925 #if __riscv_flen >= 32 || __riscv_xlen == 64 1926 case 0b00'011: // c.flw / c.ld 1927 #endif 1928 #if __riscv_flen == 64 1929 case 0b00'001: // c.fld 1930 case 0b10'001: // c.fldsp 1931 #endif 1932 return SignalContext::READ; 1933 case 0b00'110: // c.sw 1934 case 0b10'110: // c.swsp 1935 #if __riscv_flen >= 32 || __riscv_xlen == 64 1936 case 0b00'111: // c.fsw / c.sd 1937 case 0b10'111: // c.fswsp / c.sdsp 1938 #endif 1939 #if __riscv_flen == 64 1940 case 0b00'101: // c.fsd 1941 case 0b10'101: // c.fsdsp 1942 #endif 1943 return SignalContext::WRITE; 1944 default: 1945 return SignalContext::UNKNOWN; 1946 } 1947 } 1948 #endif 1949 1950 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits 1951 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive 1952 switch (opcode) { 1953 case 0b0000011: // loads 1954 switch (funct3) { 1955 case 0b000: // lb 1956 case 0b001: // lh 1957 case 0b010: // lw 1958 #if __riscv_xlen == 64 1959 case 0b011: // ld 1960 #endif 1961 case 0b100: // lbu 1962 case 0b101: // lhu 1963 return SignalContext::READ; 1964 default: 1965 return SignalContext::UNKNOWN; 1966 } 1967 case 0b0100011: // stores 1968 switch (funct3) { 1969 case 0b000: // sb 1970 case 0b001: // sh 1971 case 0b010: // sw 1972 #if __riscv_xlen == 64 1973 case 0b011: // sd 1974 #endif 1975 return SignalContext::WRITE; 1976 default: 1977 return SignalContext::UNKNOWN; 1978 } 1979 #if __riscv_flen >= 32 1980 case 0b0000111: // floating-point loads 1981 switch (funct3) { 1982 case 0b010: // flw 1983 #if __riscv_flen == 64 1984 case 0b011: // fld 1985 #endif 1986 return SignalContext::READ; 1987 default: 1988 return SignalContext::UNKNOWN; 1989 } 1990 case 0b0100111: // floating-point stores 1991 switch (funct3) { 1992 case 0b010: // fsw 1993 #if __riscv_flen == 64 1994 case 0b011: // fsd 1995 #endif 1996 return SignalContext::WRITE; 1997 default: 1998 return SignalContext::UNKNOWN; 1999 } 2000 #endif 2001 default: 2002 return SignalContext::UNKNOWN; 2003 } 2004 #else 2005 (void)ucontext; 2006 return UNKNOWN; // FIXME: Implement. 2007 #endif 2008 } 2009 2010 bool SignalContext::IsTrueFaultingAddress() const { 2011 auto si = static_cast<const siginfo_t *>(siginfo); 2012 // SIGSEGV signals without a true fault address have si_code set to 128. 2013 return si->si_signo == SIGSEGV && si->si_code != 128; 2014 } 2015 2016 void SignalContext::DumpAllRegisters(void *context) { 2017 // FIXME: Implement this. 2018 } 2019 2020 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 2021 #if SANITIZER_NETBSD 2022 // This covers all NetBSD architectures 2023 ucontext_t *ucontext = (ucontext_t *)context; 2024 *pc = _UC_MACHINE_PC(ucontext); 2025 *bp = _UC_MACHINE_FP(ucontext); 2026 *sp = _UC_MACHINE_SP(ucontext); 2027 #elif defined(__arm__) 2028 ucontext_t *ucontext = (ucontext_t*)context; 2029 *pc = ucontext->uc_mcontext.arm_pc; 2030 *bp = ucontext->uc_mcontext.arm_fp; 2031 *sp = ucontext->uc_mcontext.arm_sp; 2032 #elif defined(__aarch64__) 2033 ucontext_t *ucontext = (ucontext_t*)context; 2034 *pc = ucontext->uc_mcontext.pc; 2035 *bp = ucontext->uc_mcontext.regs[29]; 2036 *sp = ucontext->uc_mcontext.sp; 2037 #elif defined(__hppa__) 2038 ucontext_t *ucontext = (ucontext_t*)context; 2039 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 2040 /* GCC uses %r3 whenever a frame pointer is needed. */ 2041 *bp = ucontext->uc_mcontext.sc_gr[3]; 2042 *sp = ucontext->uc_mcontext.sc_gr[30]; 2043 #elif defined(__x86_64__) 2044 # if SANITIZER_FREEBSD 2045 ucontext_t *ucontext = (ucontext_t*)context; 2046 *pc = ucontext->uc_mcontext.mc_rip; 2047 *bp = ucontext->uc_mcontext.mc_rbp; 2048 *sp = ucontext->uc_mcontext.mc_rsp; 2049 # else 2050 ucontext_t *ucontext = (ucontext_t*)context; 2051 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 2052 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 2053 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 2054 # endif 2055 #elif defined(__i386__) 2056 # if SANITIZER_FREEBSD 2057 ucontext_t *ucontext = (ucontext_t*)context; 2058 *pc = ucontext->uc_mcontext.mc_eip; 2059 *bp = ucontext->uc_mcontext.mc_ebp; 2060 *sp = ucontext->uc_mcontext.mc_esp; 2061 # else 2062 ucontext_t *ucontext = (ucontext_t*)context; 2063 # if SANITIZER_SOLARIS 2064 /* Use the numeric values: the symbolic ones are undefined by llvm 2065 include/llvm/Support/Solaris.h. */ 2066 # ifndef REG_EIP 2067 # define REG_EIP 14 // REG_PC 2068 # endif 2069 # ifndef REG_EBP 2070 # define REG_EBP 6 // REG_FP 2071 # endif 2072 # ifndef REG_UESP 2073 # define REG_UESP 17 // REG_SP 2074 # endif 2075 # endif 2076 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 2077 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 2078 *sp = ucontext->uc_mcontext.gregs[REG_UESP]; 2079 # endif 2080 #elif defined(__powerpc__) || defined(__powerpc64__) 2081 ucontext_t *ucontext = (ucontext_t*)context; 2082 *pc = ucontext->uc_mcontext.regs->nip; 2083 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 2084 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 2085 // pointer, but GCC always uses r31 when we need a frame pointer. 2086 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 2087 #elif defined(__sparc__) 2088 #if defined(__arch64__) || defined(__sparcv9) 2089 #define STACK_BIAS 2047 2090 #else 2091 #define STACK_BIAS 0 2092 # endif 2093 # if SANITIZER_SOLARIS 2094 ucontext_t *ucontext = (ucontext_t *)context; 2095 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 2096 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS; 2097 #else 2098 // Historical BSDism here. 2099 struct sigcontext *scontext = (struct sigcontext *)context; 2100 #if defined(__arch64__) 2101 *pc = scontext->sigc_regs.tpc; 2102 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS; 2103 #else 2104 *pc = scontext->si_regs.pc; 2105 *sp = scontext->si_regs.u_regs[14]; 2106 #endif 2107 # endif 2108 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS; 2109 #elif defined(__mips__) 2110 ucontext_t *ucontext = (ucontext_t*)context; 2111 *pc = ucontext->uc_mcontext.pc; 2112 *bp = ucontext->uc_mcontext.gregs[30]; 2113 *sp = ucontext->uc_mcontext.gregs[29]; 2114 #elif defined(__s390__) 2115 ucontext_t *ucontext = (ucontext_t*)context; 2116 # if defined(__s390x__) 2117 *pc = ucontext->uc_mcontext.psw.addr; 2118 # else 2119 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 2120 # endif 2121 *bp = ucontext->uc_mcontext.gregs[11]; 2122 *sp = ucontext->uc_mcontext.gregs[15]; 2123 #elif defined(__riscv) 2124 ucontext_t *ucontext = (ucontext_t*)context; 2125 *pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2126 *bp = ucontext->uc_mcontext.__gregs[REG_S0]; 2127 *sp = ucontext->uc_mcontext.__gregs[REG_SP]; 2128 #else 2129 # error "Unsupported arch" 2130 #endif 2131 } 2132 2133 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 2134 2135 void InitializePlatformEarly() { 2136 // Do nothing. 2137 } 2138 2139 void MaybeReexec() { 2140 // No need to re-exec on Linux. 2141 } 2142 2143 void CheckASLR() { 2144 #if SANITIZER_NETBSD 2145 int mib[3]; 2146 int paxflags; 2147 uptr len = sizeof(paxflags); 2148 2149 mib[0] = CTL_PROC; 2150 mib[1] = internal_getpid(); 2151 mib[2] = PROC_PID_PAXFLAGS; 2152 2153 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2154 Printf("sysctl failed\n"); 2155 Die(); 2156 } 2157 2158 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2159 Printf("This sanitizer is not compatible with enabled ASLR.\n" 2160 "To disable ASLR, please run \"paxctl +a %s\" and try again.\n", 2161 GetArgv()[0]); 2162 Die(); 2163 } 2164 #elif SANITIZER_PPC64V2 2165 // Disable ASLR for Linux PPC64LE. 2166 int old_personality = personality(0xffffffff); 2167 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2168 VReport(1, "WARNING: Program is being run with address space layout " 2169 "randomization (ASLR) enabled which prevents the thread and " 2170 "memory sanitizers from working on powerpc64le.\n" 2171 "ASLR will be disabled and the program re-executed.\n"); 2172 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2173 ReExec(); 2174 } 2175 #elif SANITIZER_FREEBSD 2176 int aslr_pie; 2177 uptr len = sizeof(aslr_pie); 2178 #if SANITIZER_WORDSIZE == 64 2179 if (UNLIKELY(internal_sysctlbyname("kern.elf64.aslr.pie_enable", 2180 &aslr_pie, &len, NULL, 0) == -1)) { 2181 // We're making things less 'dramatic' here since 2182 // the OID is not necessarily guaranteed to be here 2183 // just yet regarding FreeBSD release 2184 return; 2185 } 2186 2187 if (aslr_pie > 0) { 2188 Printf("This sanitizer is not compatible with enabled ASLR " 2189 "and binaries compiled with PIE\n"); 2190 Die(); 2191 } 2192 #endif 2193 // there might be 32 bits compat for 64 bits 2194 if (UNLIKELY(internal_sysctlbyname("kern.elf32.aslr.pie_enable", 2195 &aslr_pie, &len, NULL, 0) == -1)) { 2196 return; 2197 } 2198 2199 if (aslr_pie > 0) { 2200 Printf("This sanitizer is not compatible with enabled ASLR " 2201 "and binaries compiled with PIE\n"); 2202 Die(); 2203 } 2204 #else 2205 // Do nothing 2206 #endif 2207 } 2208 2209 void CheckMPROTECT() { 2210 #if SANITIZER_NETBSD 2211 int mib[3]; 2212 int paxflags; 2213 uptr len = sizeof(paxflags); 2214 2215 mib[0] = CTL_PROC; 2216 mib[1] = internal_getpid(); 2217 mib[2] = PROC_PID_PAXFLAGS; 2218 2219 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2220 Printf("sysctl failed\n"); 2221 Die(); 2222 } 2223 2224 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2225 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2226 Die(); 2227 } 2228 #else 2229 // Do nothing 2230 #endif 2231 } 2232 2233 void CheckNoDeepBind(const char *filename, int flag) { 2234 #ifdef RTLD_DEEPBIND 2235 if (flag & RTLD_DEEPBIND) { 2236 Report( 2237 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2238 " which is incompatible with sanitizer runtime " 2239 "(see https://github.com/google/sanitizers/issues/611 for details" 2240 "). If you want to run %s library under sanitizers please remove " 2241 "RTLD_DEEPBIND from dlopen flags.\n", 2242 filename, filename); 2243 Die(); 2244 } 2245 #endif 2246 } 2247 2248 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2249 uptr *largest_gap_found, 2250 uptr *max_occupied_addr) { 2251 UNREACHABLE("FindAvailableMemoryRange is not available"); 2252 return 0; 2253 } 2254 2255 bool GetRandom(void *buffer, uptr length, bool blocking) { 2256 if (!buffer || !length || length > 256) 2257 return false; 2258 #if SANITIZER_USE_GETENTROPY 2259 uptr rnd = getentropy(buffer, length); 2260 int rverrno = 0; 2261 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2262 return false; 2263 else if (rnd == 0) 2264 return true; 2265 #endif // SANITIZER_USE_GETENTROPY 2266 2267 #if SANITIZER_USE_GETRANDOM 2268 static atomic_uint8_t skip_getrandom_syscall; 2269 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2270 // Up to 256 bytes, getrandom will not be interrupted. 2271 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2272 blocking ? 0 : GRND_NONBLOCK); 2273 int rverrno = 0; 2274 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2275 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2276 else if (res == length) 2277 return true; 2278 } 2279 #endif // SANITIZER_USE_GETRANDOM 2280 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2281 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2282 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2283 if (internal_iserror(fd)) 2284 return false; 2285 uptr res = internal_read(fd, buffer, length); 2286 if (internal_iserror(res)) 2287 return false; 2288 internal_close(fd); 2289 return true; 2290 } 2291 2292 } // namespace __sanitizer 2293 2294 #endif 2295