1//===-- sanitizer_linux.cpp -----------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file is shared between AddressSanitizer and ThreadSanitizer 10// run-time libraries and implements linux-specific functions from 11// sanitizer_libc.h. 12//===----------------------------------------------------------------------===// 13 14#include "sanitizer_platform.h" 15 16#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \ 17 SANITIZER_OPENBSD || SANITIZER_SOLARIS 18 19#include "sanitizer_common.h" 20#include "sanitizer_flags.h" 21#include "sanitizer_getauxval.h" 22#include "sanitizer_internal_defs.h" 23#include "sanitizer_libc.h" 24#include "sanitizer_linux.h" 25#include "sanitizer_mutex.h" 26#include "sanitizer_placement_new.h" 27#include "sanitizer_procmaps.h" 28 29#if SANITIZER_LINUX && !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#include <asm/stat.h> 42#undef stat 43#endif 44 45#include <dlfcn.h> 46#include <errno.h> 47#include <fcntl.h> 48#include <link.h> 49#include <pthread.h> 50#include <sched.h> 51#include <signal.h> 52#include <sys/mman.h> 53#include <sys/param.h> 54#if !SANITIZER_SOLARIS 55#include <sys/ptrace.h> 56#endif 57#include <sys/resource.h> 58#include <sys/stat.h> 59#include <sys/syscall.h> 60#include <sys/time.h> 61#include <sys/types.h> 62#if !SANITIZER_OPENBSD 63#include <ucontext.h> 64#endif 65#if SANITIZER_OPENBSD 66#include <sys/futex.h> 67#include <sys/sysctl.h> 68#endif 69#include <unistd.h> 70 71#if SANITIZER_LINUX 72#include <sys/utsname.h> 73#endif 74 75#if SANITIZER_LINUX && !SANITIZER_ANDROID 76#include <sys/personality.h> 77#endif 78 79#if SANITIZER_FREEBSD 80#include <sys/exec.h> 81#include <sys/sysctl.h> 82#include <machine/atomic.h> 83extern "C" { 84// <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on 85// FreeBSD 9.2 and 10.0. 86#include <sys/umtx.h> 87} 88#include <sys/thr.h> 89#endif // SANITIZER_FREEBSD 90 91#if SANITIZER_NETBSD 92#include <limits.h> // For NAME_MAX 93#include <sys/sysctl.h> 94#include <sys/exec.h> 95extern struct ps_strings *__ps_strings; 96#endif // SANITIZER_NETBSD 97 98#if SANITIZER_SOLARIS 99#include <stdlib.h> 100#include <thread.h> 101#define environ _environ 102#endif 103 104extern char **environ; 105 106#if SANITIZER_LINUX 107// <linux/time.h> 108struct kernel_timeval { 109 long tv_sec; 110 long tv_usec; 111}; 112 113// <linux/futex.h> is broken on some linux distributions. 114const int FUTEX_WAIT = 0; 115const int FUTEX_WAKE = 1; 116const int FUTEX_PRIVATE_FLAG = 128; 117const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; 118const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; 119#endif // SANITIZER_LINUX 120 121// Are we using 32-bit or 64-bit Linux syscalls? 122// x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 123// but it still needs to use 64-bit syscalls. 124#if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \ 125 SANITIZER_WORDSIZE == 64) 126# define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 127#else 128# define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 129#endif 130 131// Note : FreeBSD had implemented both 132// Linux and OpenBSD apis, available from 133// future 12.x version most likely 134#if SANITIZER_LINUX && defined(__NR_getrandom) 135# if !defined(GRND_NONBLOCK) 136# define GRND_NONBLOCK 1 137# endif 138# define SANITIZER_USE_GETRANDOM 1 139#else 140# define SANITIZER_USE_GETRANDOM 0 141#endif // SANITIZER_LINUX && defined(__NR_getrandom) 142 143#if SANITIZER_OPENBSD 144# define SANITIZER_USE_GETENTROPY 1 145#else 146# if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000 147# define SANITIZER_USE_GETENTROPY 1 148# else 149# define SANITIZER_USE_GETENTROPY 0 150# endif 151#endif // SANITIZER_USE_GETENTROPY 152 153namespace __sanitizer { 154 155#if SANITIZER_LINUX && defined(__x86_64__) 156#include "sanitizer_syscall_linux_x86_64.inc" 157#elif SANITIZER_LINUX && defined(__aarch64__) 158#include "sanitizer_syscall_linux_aarch64.inc" 159#elif SANITIZER_LINUX && defined(__arm__) 160#include "sanitizer_syscall_linux_arm.inc" 161#else 162#include "sanitizer_syscall_generic.inc" 163#endif 164 165// --------------- sanitizer_libc.h 166#if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 167#if !SANITIZER_S390 && !SANITIZER_OPENBSD 168uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd, 169 u64 offset) { 170#if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 171 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd, 172 offset); 173#else 174 // mmap2 specifies file offset in 4096-byte units. 175 CHECK(IsAligned(offset, 4096)); 176 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd, 177 offset / 4096); 178#endif 179} 180#endif // !SANITIZER_S390 && !SANITIZER_OPENBSD 181 182#if !SANITIZER_OPENBSD 183uptr internal_munmap(void *addr, uptr length) { 184 return internal_syscall(SYSCALL(munmap), (uptr)addr, length); 185} 186 187int internal_mprotect(void *addr, uptr length, int prot) { 188 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot); 189} 190#endif 191 192uptr internal_close(fd_t fd) { 193 return internal_syscall(SYSCALL(close), fd); 194} 195 196uptr internal_open(const char *filename, int flags) { 197#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 198 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags); 199#else 200 return internal_syscall(SYSCALL(open), (uptr)filename, flags); 201#endif 202} 203 204uptr internal_open(const char *filename, int flags, u32 mode) { 205#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 206 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags, 207 mode); 208#else 209 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode); 210#endif 211} 212 213uptr internal_read(fd_t fd, void *buf, uptr count) { 214 sptr res; 215 HANDLE_EINTR(res, 216 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)); 217 return res; 218} 219 220uptr internal_write(fd_t fd, const void *buf, uptr count) { 221 sptr res; 222 HANDLE_EINTR(res, 223 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)); 224 return res; 225} 226 227uptr internal_ftruncate(fd_t fd, uptr size) { 228 sptr res; 229 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd, 230 (OFF_T)size)); 231 return res; 232} 233 234#if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && SANITIZER_LINUX 235static void stat64_to_stat(struct stat64 *in, struct stat *out) { 236 internal_memset(out, 0, sizeof(*out)); 237 out->st_dev = in->st_dev; 238 out->st_ino = in->st_ino; 239 out->st_mode = in->st_mode; 240 out->st_nlink = in->st_nlink; 241 out->st_uid = in->st_uid; 242 out->st_gid = in->st_gid; 243 out->st_rdev = in->st_rdev; 244 out->st_size = in->st_size; 245 out->st_blksize = in->st_blksize; 246 out->st_blocks = in->st_blocks; 247 out->st_atime = in->st_atime; 248 out->st_mtime = in->st_mtime; 249 out->st_ctime = in->st_ctime; 250} 251#endif 252 253#if defined(__mips64) 254// Undefine compatibility macros from <sys/stat.h> 255// so that they would not clash with the kernel_stat 256// st_[a|m|c]time fields 257#undef st_atime 258#undef st_mtime 259#undef st_ctime 260#if defined(SANITIZER_ANDROID) 261// Bionic sys/stat.h defines additional macros 262// for compatibility with the old NDKs and 263// they clash with the kernel_stat structure 264// st_[a|m|c]time_nsec fields. 265#undef st_atime_nsec 266#undef st_mtime_nsec 267#undef st_ctime_nsec 268#endif 269static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) { 270 internal_memset(out, 0, sizeof(*out)); 271 out->st_dev = in->st_dev; 272 out->st_ino = in->st_ino; 273 out->st_mode = in->st_mode; 274 out->st_nlink = in->st_nlink; 275 out->st_uid = in->st_uid; 276 out->st_gid = in->st_gid; 277 out->st_rdev = in->st_rdev; 278 out->st_size = in->st_size; 279 out->st_blksize = in->st_blksize; 280 out->st_blocks = in->st_blocks; 281#if defined(__USE_MISC) || \ 282 defined(__USE_XOPEN2K8) || \ 283 defined(SANITIZER_ANDROID) 284 out->st_atim.tv_sec = in->st_atime; 285 out->st_atim.tv_nsec = in->st_atime_nsec; 286 out->st_mtim.tv_sec = in->st_mtime; 287 out->st_mtim.tv_nsec = in->st_mtime_nsec; 288 out->st_ctim.tv_sec = in->st_ctime; 289 out->st_ctim.tv_nsec = in->st_ctime_nsec; 290#else 291 out->st_atime = in->st_atime; 292 out->st_atimensec = in->st_atime_nsec; 293 out->st_mtime = in->st_mtime; 294 out->st_mtimensec = in->st_mtime_nsec; 295 out->st_ctime = in->st_ctime; 296 out->st_atimensec = in->st_ctime_nsec; 297#endif 298} 299#endif 300 301uptr internal_stat(const char *path, void *buf) { 302#if SANITIZER_FREEBSD || SANITIZER_OPENBSD 303 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0); 304#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 305 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 306 0); 307#elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 308# if defined(__mips64) 309 // For mips64, stat syscall fills buffer in the format of kernel_stat 310 struct kernel_stat kbuf; 311 int res = internal_syscall(SYSCALL(stat), path, &kbuf); 312 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 313 return res; 314# else 315 return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf); 316# endif 317#else 318 struct stat64 buf64; 319 int res = internal_syscall(SYSCALL(stat64), path, &buf64); 320 stat64_to_stat(&buf64, (struct stat *)buf); 321 return res; 322#endif 323} 324 325uptr internal_lstat(const char *path, void *buf) { 326#if SANITIZER_FREEBSD || SANITIZER_OPENBSD 327 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 328 AT_SYMLINK_NOFOLLOW); 329#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 330 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 331 AT_SYMLINK_NOFOLLOW); 332#elif SANITIZER_LINUX_USES_64BIT_SYSCALLS 333# if SANITIZER_MIPS64 334 // For mips64, lstat syscall fills buffer in the format of kernel_stat 335 struct kernel_stat kbuf; 336 int res = internal_syscall(SYSCALL(lstat), path, &kbuf); 337 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 338 return res; 339# else 340 return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf); 341# endif 342#else 343 struct stat64 buf64; 344 int res = internal_syscall(SYSCALL(lstat64), path, &buf64); 345 stat64_to_stat(&buf64, (struct stat *)buf); 346 return res; 347#endif 348} 349 350uptr internal_fstat(fd_t fd, void *buf) { 351#if SANITIZER_FREEBSD || SANITIZER_OPENBSD || \ 352 SANITIZER_LINUX_USES_64BIT_SYSCALLS 353#if SANITIZER_MIPS64 && !SANITIZER_OPENBSD 354 // For mips64, fstat syscall fills buffer in the format of kernel_stat 355 struct kernel_stat kbuf; 356 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf); 357 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 358 return res; 359# else 360 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf); 361# endif 362#else 363 struct stat64 buf64; 364 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64); 365 stat64_to_stat(&buf64, (struct stat *)buf); 366 return res; 367#endif 368} 369 370uptr internal_filesize(fd_t fd) { 371 struct stat st; 372 if (internal_fstat(fd, &st)) 373 return -1; 374 return (uptr)st.st_size; 375} 376 377uptr internal_dup(int oldfd) { 378 return internal_syscall(SYSCALL(dup), oldfd); 379} 380 381uptr internal_dup2(int oldfd, int newfd) { 382#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 383 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0); 384#else 385 return internal_syscall(SYSCALL(dup2), oldfd, newfd); 386#endif 387} 388 389uptr internal_readlink(const char *path, char *buf, uptr bufsize) { 390#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 391 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 392 bufsize); 393#elif SANITIZER_OPENBSD 394 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 395 bufsize); 396#else 397 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize); 398#endif 399} 400 401uptr internal_unlink(const char *path) { 402#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD 403 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0); 404#else 405 return internal_syscall(SYSCALL(unlink), (uptr)path); 406#endif 407} 408 409uptr internal_rename(const char *oldpath, const char *newpath) { 410#if defined(__riscv) 411 return internal_syscall(SYSCALL(renameat2), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 412 (uptr)newpath, 0); 413#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD 414 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 415 (uptr)newpath); 416#else 417 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath); 418#endif 419} 420 421uptr internal_sched_yield() { 422 return internal_syscall(SYSCALL(sched_yield)); 423} 424 425void internal__exit(int exitcode) { 426#if SANITIZER_FREEBSD || SANITIZER_OPENBSD 427 internal_syscall(SYSCALL(exit), exitcode); 428#else 429 internal_syscall(SYSCALL(exit_group), exitcode); 430#endif 431 Die(); // Unreachable. 432} 433 434unsigned int internal_sleep(unsigned int seconds) { 435 struct timespec ts; 436 ts.tv_sec = seconds; 437 ts.tv_nsec = 0; 438 int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts); 439 if (res) return ts.tv_sec; 440 return 0; 441} 442 443uptr internal_execve(const char *filename, char *const argv[], 444 char *const envp[]) { 445 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, 446 (uptr)envp); 447} 448#endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 449 450// ----------------- sanitizer_common.h 451bool FileExists(const char *filename) { 452 if (ShouldMockFailureToOpen(filename)) 453 return false; 454 struct stat st; 455#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 456 if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0)) 457#else 458 if (internal_stat(filename, &st)) 459#endif 460 return false; 461 // Sanity check: filename is a regular file. 462 return S_ISREG(st.st_mode); 463} 464 465#if !SANITIZER_NETBSD 466tid_t GetTid() { 467#if SANITIZER_FREEBSD 468 long Tid; 469 thr_self(&Tid); 470 return Tid; 471#elif SANITIZER_OPENBSD 472 return internal_syscall(SYSCALL(getthrid)); 473#elif SANITIZER_SOLARIS 474 return thr_self(); 475#else 476 return internal_syscall(SYSCALL(gettid)); 477#endif 478} 479 480int TgKill(pid_t pid, tid_t tid, int sig) { 481#if SANITIZER_LINUX 482 return internal_syscall(SYSCALL(tgkill), pid, tid, sig); 483#elif SANITIZER_FREEBSD 484 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig); 485#elif SANITIZER_OPENBSD 486 (void)pid; 487 return internal_syscall(SYSCALL(thrkill), tid, sig, nullptr); 488#elif SANITIZER_SOLARIS 489 (void)pid; 490 return thr_kill(tid, sig); 491#endif 492} 493#endif 494 495#if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 496u64 NanoTime() { 497#if SANITIZER_FREEBSD || SANITIZER_OPENBSD 498 timeval tv; 499#else 500 kernel_timeval tv; 501#endif 502 internal_memset(&tv, 0, sizeof(tv)); 503 internal_syscall(SYSCALL(gettimeofday), &tv, 0); 504 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000; 505} 506 507uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) { 508 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp); 509} 510#endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 511 512// Like getenv, but reads env directly from /proc (on Linux) or parses the 513// 'environ' array (on some others) and does not use libc. This function 514// should be called first inside __asan_init. 515const char *GetEnv(const char *name) { 516#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD || \ 517 SANITIZER_SOLARIS 518 if (::environ != 0) { 519 uptr NameLen = internal_strlen(name); 520 for (char **Env = ::environ; *Env != 0; Env++) { 521 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=') 522 return (*Env) + NameLen + 1; 523 } 524 } 525 return 0; // Not found. 526#elif SANITIZER_LINUX 527 static char *environ; 528 static uptr len; 529 static bool inited; 530 if (!inited) { 531 inited = true; 532 uptr environ_size; 533 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len)) 534 environ = nullptr; 535 } 536 if (!environ || len == 0) return nullptr; 537 uptr namelen = internal_strlen(name); 538 const char *p = environ; 539 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 540 // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 541 const char* endp = 542 (char*)internal_memchr(p, '\0', len - (p - environ)); 543 if (!endp) // this entry isn't NUL terminated 544 return nullptr; 545 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 546 return p + namelen + 1; // point after = 547 p = endp + 1; 548 } 549 return nullptr; // Not found. 550#else 551#error "Unsupported platform" 552#endif 553} 554 555#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_OPENBSD && \ 556 !SANITIZER_GO 557extern "C" { 558SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 559} 560#endif 561 562#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && \ 563 !SANITIZER_OPENBSD 564static void ReadNullSepFileToArray(const char *path, char ***arr, 565 int arr_size) { 566 char *buff; 567 uptr buff_size; 568 uptr buff_len; 569 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 570 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 571 (*arr)[0] = nullptr; 572 return; 573 } 574 (*arr)[0] = buff; 575 int count, i; 576 for (count = 1, i = 1; ; i++) { 577 if (buff[i] == 0) { 578 if (buff[i+1] == 0) break; 579 (*arr)[count] = &buff[i+1]; 580 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 581 count++; 582 } 583 } 584 (*arr)[count] = nullptr; 585} 586#endif 587 588#if !SANITIZER_OPENBSD 589static void GetArgsAndEnv(char ***argv, char ***envp) { 590#if SANITIZER_FREEBSD 591 // On FreeBSD, retrieving the argument and environment arrays is done via the 592 // kern.ps_strings sysctl, which returns a pointer to a structure containing 593 // this information. See also <sys/exec.h>. 594 ps_strings *pss; 595 uptr sz = sizeof(pss); 596 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 597 Printf("sysctl kern.ps_strings failed\n"); 598 Die(); 599 } 600 *argv = pss->ps_argvstr; 601 *envp = pss->ps_envstr; 602#elif SANITIZER_NETBSD 603 *argv = __ps_strings->ps_argvstr; 604 *envp = __ps_strings->ps_envstr; 605#else // SANITIZER_FREEBSD 606#if !SANITIZER_GO 607 if (&__libc_stack_end) { 608 uptr* stack_end = (uptr*)__libc_stack_end; 609 // Normally argc can be obtained from *stack_end, however, on ARM glibc's 610 // _start clobbers it: 611 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/start.S;hb=refs/heads/release/2.31/master#l75 612 // Do not special-case ARM and infer argc from argv everywhere. 613 int argc = 0; 614 while (stack_end[argc + 1]) argc++; 615 *argv = (char**)(stack_end + 1); 616 *envp = (char**)(stack_end + argc + 2); 617 } else { 618#endif // !SANITIZER_GO 619 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 620 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 621 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 622#if !SANITIZER_GO 623 } 624#endif // !SANITIZER_GO 625#endif // SANITIZER_FREEBSD 626} 627 628char **GetArgv() { 629 char **argv, **envp; 630 GetArgsAndEnv(&argv, &envp); 631 return argv; 632} 633 634char **GetEnviron() { 635 char **argv, **envp; 636 GetArgsAndEnv(&argv, &envp); 637 return envp; 638} 639 640#endif // !SANITIZER_OPENBSD 641 642#if !SANITIZER_SOLARIS 643enum MutexState { 644 MtxUnlocked = 0, 645 MtxLocked = 1, 646 MtxSleeping = 2 647}; 648 649BlockingMutex::BlockingMutex() { 650 internal_memset(this, 0, sizeof(*this)); 651} 652 653void BlockingMutex::Lock() { 654 CHECK_EQ(owner_, 0); 655 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 656 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked) 657 return; 658 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) { 659#if SANITIZER_FREEBSD 660 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0); 661#elif SANITIZER_NETBSD 662 sched_yield(); /* No userspace futex-like synchronization */ 663#else 664 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT_PRIVATE, MtxSleeping, 665 0, 0, 0); 666#endif 667 } 668} 669 670void BlockingMutex::Unlock() { 671 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 672 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release); 673 CHECK_NE(v, MtxUnlocked); 674 if (v == MtxSleeping) { 675#if SANITIZER_FREEBSD 676 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0); 677#elif SANITIZER_NETBSD 678 /* No userspace futex-like synchronization */ 679#else 680 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0); 681#endif 682 } 683} 684 685void BlockingMutex::CheckLocked() { 686 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 687 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed)); 688} 689#endif // !SANITIZER_SOLARIS 690 691// ----------------- sanitizer_linux.h 692// The actual size of this structure is specified by d_reclen. 693// Note that getdents64 uses a different structure format. We only provide the 694// 32-bit syscall here. 695#if SANITIZER_NETBSD 696// Not used 697#elif SANITIZER_OPENBSD 698// struct dirent is different for Linux and us. At this moment, we use only 699// d_fileno (Linux call this d_ino), d_reclen, and d_name. 700struct linux_dirent { 701 u64 d_ino; // d_fileno 702 u16 d_reclen; 703 u16 d_namlen; // not used 704 u8 d_type; // not used 705 char d_name[NAME_MAX + 1]; 706}; 707#else 708struct linux_dirent { 709#if SANITIZER_X32 || defined(__aarch64__) 710 u64 d_ino; 711 u64 d_off; 712#else 713 unsigned long d_ino; 714 unsigned long d_off; 715#endif 716 unsigned short d_reclen; 717#ifdef __aarch64__ 718 unsigned char d_type; 719#endif 720 char d_name[256]; 721}; 722#endif 723 724#if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 725// Syscall wrappers. 726uptr internal_ptrace(int request, int pid, void *addr, void *data) { 727 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 728 (uptr)data); 729} 730 731uptr internal_waitpid(int pid, int *status, int options) { 732 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 733 0 /* rusage */); 734} 735 736uptr internal_getpid() { 737 return internal_syscall(SYSCALL(getpid)); 738} 739 740uptr internal_getppid() { 741 return internal_syscall(SYSCALL(getppid)); 742} 743 744int internal_dlinfo(void *handle, int request, void *p) { 745#if SANITIZER_FREEBSD 746 return dlinfo(handle, request, p); 747#else 748 UNIMPLEMENTED(); 749#endif 750} 751 752uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 753#if SANITIZER_FREEBSD 754 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 755#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 756 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 757#else 758 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 759#endif 760} 761 762uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 763 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 764} 765 766#if SANITIZER_LINUX 767uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 768 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 769} 770#endif 771 772uptr internal_sigaltstack(const void *ss, void *oss) { 773 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 774} 775 776int internal_fork() { 777#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 778 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 779#else 780 return internal_syscall(SYSCALL(fork)); 781#endif 782} 783 784#if SANITIZER_FREEBSD || SANITIZER_OPENBSD 785int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 786 uptr *oldlenp, const void *newp, uptr newlen) { 787#if SANITIZER_OPENBSD 788 return sysctl(name, namelen, oldp, (size_t *)oldlenp, (void *)newp, 789 (size_t)newlen); 790#else 791 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 792 (size_t *)oldlenp, newp, (size_t)newlen); 793#endif 794} 795 796#if SANITIZER_FREEBSD 797int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 798 const void *newp, uptr newlen) { 799 static decltype(sysctlbyname) *real = nullptr; 800 if (!real) 801 real = (decltype(sysctlbyname) *)dlsym(RTLD_NEXT, "sysctlbyname"); 802 CHECK(real); 803 return real(sname, oldp, (size_t *)oldlenp, newp, (size_t)newlen); 804} 805#endif 806#endif 807 808#if SANITIZER_LINUX 809#define SA_RESTORER 0x04000000 810// Doesn't set sa_restorer if the caller did not set it, so use with caution 811//(see below). 812int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 813 __sanitizer_kernel_sigaction_t k_act, k_oldact; 814 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 815 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 816 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 817 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 818 if (u_act) { 819 k_act.handler = u_act->handler; 820 k_act.sigaction = u_act->sigaction; 821 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 822 sizeof(__sanitizer_kernel_sigset_t)); 823 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 824 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 825 // FIXME: most often sa_restorer is unset, however the kernel requires it 826 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 827 // If sa_restorer passed to the kernel is NULL, the program may crash upon 828 // signal delivery or fail to unwind the stack in the signal handler. 829 // libc implementation of sigaction() passes its own restorer to 830 // rt_sigaction, so we need to do the same (we'll need to reimplement the 831 // restorers; for x86_64 the restorer address can be obtained from 832 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 833#if !SANITIZER_ANDROID || !SANITIZER_MIPS32 834 k_act.sa_restorer = u_act->sa_restorer; 835#endif 836 } 837 838 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 839 (uptr)(u_act ? &k_act : nullptr), 840 (uptr)(u_oldact ? &k_oldact : nullptr), 841 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 842 843 if ((result == 0) && u_oldact) { 844 u_oldact->handler = k_oldact.handler; 845 u_oldact->sigaction = k_oldact.sigaction; 846 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 847 sizeof(__sanitizer_kernel_sigset_t)); 848 u_oldact->sa_flags = k_oldact.sa_flags; 849#if !SANITIZER_ANDROID || !SANITIZER_MIPS32 850 u_oldact->sa_restorer = k_oldact.sa_restorer; 851#endif 852 } 853 return result; 854} 855#endif // SANITIZER_LINUX 856 857uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 858 __sanitizer_sigset_t *oldset) { 859#if SANITIZER_FREEBSD || SANITIZER_OPENBSD 860 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 861#else 862 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 863 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 864 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, (uptr)k_set, 865 (uptr)k_oldset, sizeof(__sanitizer_kernel_sigset_t)); 866#endif 867} 868 869void internal_sigfillset(__sanitizer_sigset_t *set) { 870 internal_memset(set, 0xff, sizeof(*set)); 871} 872 873void internal_sigemptyset(__sanitizer_sigset_t *set) { 874 internal_memset(set, 0, sizeof(*set)); 875} 876 877#if SANITIZER_LINUX 878void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 879 signum -= 1; 880 CHECK_GE(signum, 0); 881 CHECK_LT(signum, sizeof(*set) * 8); 882 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 883 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 884 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 885 k_set->sig[idx] &= ~(1 << bit); 886} 887 888bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 889 signum -= 1; 890 CHECK_GE(signum, 0); 891 CHECK_LT(signum, sizeof(*set) * 8); 892 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 893 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 894 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 895 return k_set->sig[idx] & (1 << bit); 896} 897#elif SANITIZER_FREEBSD 898void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 899 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 900 sigdelset(rset, signum); 901} 902 903bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 904 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 905 return sigismember(rset, signum); 906} 907#endif 908#endif // !SANITIZER_SOLARIS 909 910#if !SANITIZER_NETBSD 911// ThreadLister implementation. 912ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) { 913 char task_directory_path[80]; 914 internal_snprintf(task_directory_path, sizeof(task_directory_path), 915 "/proc/%d/task/", pid); 916 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 917 if (internal_iserror(descriptor_)) { 918 Report("Can't open /proc/%d/task for reading.\n", pid); 919 } 920} 921 922ThreadLister::Result ThreadLister::ListThreads( 923 InternalMmapVector<tid_t> *threads) { 924 if (internal_iserror(descriptor_)) 925 return Error; 926 internal_lseek(descriptor_, 0, SEEK_SET); 927 threads->clear(); 928 929 Result result = Ok; 930 for (bool first_read = true;; first_read = false) { 931 // Resize to max capacity if it was downsized by IsAlive. 932 buffer_.resize(buffer_.capacity()); 933 CHECK_GE(buffer_.size(), 4096); 934 uptr read = internal_getdents( 935 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size()); 936 if (!read) 937 return result; 938 if (internal_iserror(read)) { 939 Report("Can't read directory entries from /proc/%d/task.\n", pid_); 940 return Error; 941 } 942 943 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 944 struct linux_dirent *entry = (struct linux_dirent *)begin; 945 begin += entry->d_reclen; 946 if (entry->d_ino == 1) { 947 // Inode 1 is for bad blocks and also can be a reason for early return. 948 // Should be emitted if kernel tried to output terminating thread. 949 // See proc_task_readdir implementation in Linux. 950 result = Incomplete; 951 } 952 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 953 threads->push_back(internal_atoll(entry->d_name)); 954 } 955 956 // Now we are going to detect short-read or early EOF. In such cases Linux 957 // can return inconsistent list with missing alive threads. 958 // Code will just remember that the list can be incomplete but it will 959 // continue reads to return as much as possible. 960 if (!first_read) { 961 // The first one was a short-read by definition. 962 result = Incomplete; 963 } else if (read > buffer_.size() - 1024) { 964 // Read was close to the buffer size. So double the size and assume the 965 // worst. 966 buffer_.resize(buffer_.size() * 2); 967 result = Incomplete; 968 } else if (!threads->empty() && !IsAlive(threads->back())) { 969 // Maybe Linux early returned from read on terminated thread (!pid_alive) 970 // and failed to restore read position. 971 // See next_tid and proc_task_instantiate in Linux. 972 result = Incomplete; 973 } 974 } 975} 976 977bool ThreadLister::IsAlive(int tid) { 978 // /proc/%d/task/%d/status uses same call to detect alive threads as 979 // proc_task_readdir. See task_state implementation in Linux. 980 char path[80]; 981 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid); 982 if (!ReadFileToVector(path, &buffer_) || buffer_.empty()) 983 return false; 984 buffer_.push_back(0); 985 static const char kPrefix[] = "\nPPid:"; 986 const char *field = internal_strstr(buffer_.data(), kPrefix); 987 if (!field) 988 return false; 989 field += internal_strlen(kPrefix); 990 return (int)internal_atoll(field) != 0; 991} 992 993ThreadLister::~ThreadLister() { 994 if (!internal_iserror(descriptor_)) 995 internal_close(descriptor_); 996} 997#endif 998 999#if SANITIZER_WORDSIZE == 32 1000// Take care of unusable kernel area in top gigabyte. 1001static uptr GetKernelAreaSize() { 1002#if SANITIZER_LINUX && !SANITIZER_X32 1003 const uptr gbyte = 1UL << 30; 1004 1005 // Firstly check if there are writable segments 1006 // mapped to top gigabyte (e.g. stack). 1007 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 1008 if (proc_maps.Error()) 1009 return 0; 1010 MemoryMappedSegment segment; 1011 while (proc_maps.Next(&segment)) { 1012 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0; 1013 } 1014 1015#if !SANITIZER_ANDROID 1016 // Even if nothing is mapped, top Gb may still be accessible 1017 // if we are running on 64-bit kernel. 1018 // Uname may report misleading results if personality type 1019 // is modified (e.g. under schroot) so check this as well. 1020 struct utsname uname_info; 1021 int pers = personality(0xffffffffUL); 1022 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 && 1023 internal_strstr(uname_info.machine, "64")) 1024 return 0; 1025#endif // SANITIZER_ANDROID 1026 1027 // Top gigabyte is reserved for kernel. 1028 return gbyte; 1029#else 1030 return 0; 1031#endif // SANITIZER_LINUX && !SANITIZER_X32 1032} 1033#endif // SANITIZER_WORDSIZE == 32 1034 1035uptr GetMaxVirtualAddress() { 1036#if (SANITIZER_NETBSD || SANITIZER_OPENBSD) && defined(__x86_64__) 1037 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE) 1038#elif SANITIZER_WORDSIZE == 64 1039# if defined(__powerpc64__) || defined(__aarch64__) 1040 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 1041 // We somehow need to figure out which one we are using now and choose 1042 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 1043 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 1044 // of the address space, so simply checking the stack address is not enough. 1045 // This should (does) work for both PowerPC64 Endian modes. 1046 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit. 1047 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1; 1048# elif defined(__mips64) 1049 return (1ULL << 40) - 1; // 0x000000ffffffffffUL; 1050# elif defined(__s390x__) 1051 return (1ULL << 53) - 1; // 0x001fffffffffffffUL; 1052#elif defined(__sparc__) 1053 return ~(uptr)0; 1054# else 1055 return (1ULL << 47) - 1; // 0x00007fffffffffffUL; 1056# endif 1057#else // SANITIZER_WORDSIZE == 32 1058# if defined(__s390__) 1059 return (1ULL << 31) - 1; // 0x7fffffff; 1060# else 1061 return (1ULL << 32) - 1; // 0xffffffff; 1062# endif 1063#endif // SANITIZER_WORDSIZE 1064} 1065 1066uptr GetMaxUserVirtualAddress() { 1067 uptr addr = GetMaxVirtualAddress(); 1068#if SANITIZER_WORDSIZE == 32 && !defined(__s390__) 1069 if (!common_flags()->full_address_space) 1070 addr -= GetKernelAreaSize(); 1071 CHECK_LT(reinterpret_cast<uptr>(&addr), addr); 1072#endif 1073 return addr; 1074} 1075 1076#if !SANITIZER_ANDROID 1077uptr GetPageSize() { 1078#if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) && \ 1079 defined(EXEC_PAGESIZE) 1080 return EXEC_PAGESIZE; 1081#elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1082// Use sysctl as sysconf can trigger interceptors internally. 1083 int pz = 0; 1084 uptr pzl = sizeof(pz); 1085 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1086 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1087 CHECK_EQ(rv, 0); 1088 return (uptr)pz; 1089#elif SANITIZER_USE_GETAUXVAL 1090 return getauxval(AT_PAGESZ); 1091#else 1092 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1093#endif 1094} 1095#endif // !SANITIZER_ANDROID 1096 1097#if !SANITIZER_OPENBSD 1098uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { 1099#if SANITIZER_SOLARIS 1100 const char *default_module_name = getexecname(); 1101 CHECK_NE(default_module_name, NULL); 1102 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1103#else 1104#if SANITIZER_FREEBSD || SANITIZER_NETBSD 1105#if SANITIZER_FREEBSD 1106 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1107#else 1108 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1109#endif 1110 const char *default_module_name = "kern.proc.pathname"; 1111 uptr Size = buf_len; 1112 bool IsErr = 1113 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1114 int readlink_error = IsErr ? errno : 0; 1115 uptr module_name_len = Size; 1116#else 1117 const char *default_module_name = "/proc/self/exe"; 1118 uptr module_name_len = internal_readlink( 1119 default_module_name, buf, buf_len); 1120 int readlink_error; 1121 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1122#endif // SANITIZER_SOLARIS 1123 if (IsErr) { 1124 // We can't read binary name for some reason, assume it's unknown. 1125 Report("WARNING: reading executable name failed with errno %d, " 1126 "some stack frames may not be symbolized\n", readlink_error); 1127 module_name_len = internal_snprintf(buf, buf_len, "%s", 1128 default_module_name); 1129 CHECK_LT(module_name_len, buf_len); 1130 } 1131 return module_name_len; 1132#endif 1133} 1134#endif // !SANITIZER_OPENBSD 1135 1136uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1137#if SANITIZER_LINUX 1138 char *tmpbuf; 1139 uptr tmpsize; 1140 uptr tmplen; 1141 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1142 1024 * 1024)) { 1143 internal_strncpy(buf, tmpbuf, buf_len); 1144 UnmapOrDie(tmpbuf, tmpsize); 1145 return internal_strlen(buf); 1146 } 1147#endif 1148 return ReadBinaryName(buf, buf_len); 1149} 1150 1151// Match full names of the form /path/to/base_name{-,.}* 1152bool LibraryNameIs(const char *full_name, const char *base_name) { 1153 const char *name = full_name; 1154 // Strip path. 1155 while (*name != '\0') name++; 1156 while (name > full_name && *name != '/') name--; 1157 if (*name == '/') name++; 1158 uptr base_name_length = internal_strlen(base_name); 1159 if (internal_strncmp(name, base_name, base_name_length)) return false; 1160 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1161} 1162 1163#if !SANITIZER_ANDROID 1164// Call cb for each region mapped by map. 1165void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1166 CHECK_NE(map, nullptr); 1167#if !SANITIZER_FREEBSD && !SANITIZER_OPENBSD 1168 typedef ElfW(Phdr) Elf_Phdr; 1169 typedef ElfW(Ehdr) Elf_Ehdr; 1170#endif // !SANITIZER_FREEBSD && !SANITIZER_OPENBSD 1171 char *base = (char *)map->l_addr; 1172 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1173 char *phdrs = base + ehdr->e_phoff; 1174 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1175 1176 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1177 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1178 // objects have a non-zero base. 1179 uptr preferred_base = (uptr)-1; 1180 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1181 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1182 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1183 preferred_base = (uptr)phdr->p_vaddr; 1184 } 1185 1186 // Compute the delta from the real base to get a relocation delta. 1187 sptr delta = (uptr)base - preferred_base; 1188 // Now we can figure out what the loader really mapped. 1189 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1190 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1191 if (phdr->p_type == PT_LOAD) { 1192 uptr seg_start = phdr->p_vaddr + delta; 1193 uptr seg_end = seg_start + phdr->p_memsz; 1194 // None of these values are aligned. We consider the ragged edges of the 1195 // load command as defined, since they are mapped from the file. 1196 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1197 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1198 cb((void *)seg_start, seg_end - seg_start); 1199 } 1200 } 1201} 1202#endif 1203 1204#if defined(__x86_64__) && SANITIZER_LINUX 1205// We cannot use glibc's clone wrapper, because it messes with the child 1206// task's TLS. It writes the PID and TID of the child task to its thread 1207// descriptor, but in our case the child task shares the thread descriptor with 1208// the parent (because we don't know how to allocate a new thread 1209// descriptor to keep glibc happy). So the stock version of clone(), when 1210// used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1211uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1212 int *parent_tidptr, void *newtls, int *child_tidptr) { 1213 long long res; 1214 if (!fn || !child_stack) 1215 return -EINVAL; 1216 CHECK_EQ(0, (uptr)child_stack % 16); 1217 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1218 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1219 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1220 register void *r8 __asm__("r8") = newtls; 1221 register int *r10 __asm__("r10") = child_tidptr; 1222 __asm__ __volatile__( 1223 /* %rax = syscall(%rax = SYSCALL(clone), 1224 * %rdi = flags, 1225 * %rsi = child_stack, 1226 * %rdx = parent_tidptr, 1227 * %r8 = new_tls, 1228 * %r10 = child_tidptr) 1229 */ 1230 "syscall\n" 1231 1232 /* if (%rax != 0) 1233 * return; 1234 */ 1235 "testq %%rax,%%rax\n" 1236 "jnz 1f\n" 1237 1238 /* In the child. Terminate unwind chain. */ 1239 // XXX: We should also terminate the CFI unwind chain 1240 // here. Unfortunately clang 3.2 doesn't support the 1241 // necessary CFI directives, so we skip that part. 1242 "xorq %%rbp,%%rbp\n" 1243 1244 /* Call "fn(arg)". */ 1245 "popq %%rax\n" 1246 "popq %%rdi\n" 1247 "call *%%rax\n" 1248 1249 /* Call _exit(%rax). */ 1250 "movq %%rax,%%rdi\n" 1251 "movq %2,%%rax\n" 1252 "syscall\n" 1253 1254 /* Return to parent. */ 1255 "1:\n" 1256 : "=a" (res) 1257 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1258 "S"(child_stack), 1259 "D"(flags), 1260 "d"(parent_tidptr), 1261 "r"(r8), 1262 "r"(r10) 1263 : "memory", "r11", "rcx"); 1264 return res; 1265} 1266#elif defined(__mips__) 1267uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1268 int *parent_tidptr, void *newtls, int *child_tidptr) { 1269 long long res; 1270 if (!fn || !child_stack) 1271 return -EINVAL; 1272 CHECK_EQ(0, (uptr)child_stack % 16); 1273 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1274 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1275 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1276 register void *a3 __asm__("$7") = newtls; 1277 register int *a4 __asm__("$8") = child_tidptr; 1278 // We don't have proper CFI directives here because it requires alot of code 1279 // for very marginal benefits. 1280 __asm__ __volatile__( 1281 /* $v0 = syscall($v0 = __NR_clone, 1282 * $a0 = flags, 1283 * $a1 = child_stack, 1284 * $a2 = parent_tidptr, 1285 * $a3 = new_tls, 1286 * $a4 = child_tidptr) 1287 */ 1288 ".cprestore 16;\n" 1289 "move $4,%1;\n" 1290 "move $5,%2;\n" 1291 "move $6,%3;\n" 1292 "move $7,%4;\n" 1293 /* Store the fifth argument on stack 1294 * if we are using 32-bit abi. 1295 */ 1296#if SANITIZER_WORDSIZE == 32 1297 "lw %5,16($29);\n" 1298#else 1299 "move $8,%5;\n" 1300#endif 1301 "li $2,%6;\n" 1302 "syscall;\n" 1303 1304 /* if ($v0 != 0) 1305 * return; 1306 */ 1307 "bnez $2,1f;\n" 1308 1309 /* Call "fn(arg)". */ 1310#if SANITIZER_WORDSIZE == 32 1311#ifdef __BIG_ENDIAN__ 1312 "lw $25,4($29);\n" 1313 "lw $4,12($29);\n" 1314#else 1315 "lw $25,0($29);\n" 1316 "lw $4,8($29);\n" 1317#endif 1318#else 1319 "ld $25,0($29);\n" 1320 "ld $4,8($29);\n" 1321#endif 1322 "jal $25;\n" 1323 1324 /* Call _exit($v0). */ 1325 "move $4,$2;\n" 1326 "li $2,%7;\n" 1327 "syscall;\n" 1328 1329 /* Return to parent. */ 1330 "1:\n" 1331 : "=r" (res) 1332 : "r"(flags), 1333 "r"(child_stack), 1334 "r"(parent_tidptr), 1335 "r"(a3), 1336 "r"(a4), 1337 "i"(__NR_clone), 1338 "i"(__NR_exit) 1339 : "memory", "$29" ); 1340 return res; 1341} 1342#elif defined(__aarch64__) 1343uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1344 int *parent_tidptr, void *newtls, int *child_tidptr) { 1345 long long res; 1346 if (!fn || !child_stack) 1347 return -EINVAL; 1348 CHECK_EQ(0, (uptr)child_stack % 16); 1349 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1350 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1351 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1352 1353 register int (*__fn)(void *) __asm__("x0") = fn; 1354 register void *__stack __asm__("x1") = child_stack; 1355 register int __flags __asm__("x2") = flags; 1356 register void *__arg __asm__("x3") = arg; 1357 register int *__ptid __asm__("x4") = parent_tidptr; 1358 register void *__tls __asm__("x5") = newtls; 1359 register int *__ctid __asm__("x6") = child_tidptr; 1360 1361 __asm__ __volatile__( 1362 "mov x0,x2\n" /* flags */ 1363 "mov x2,x4\n" /* ptid */ 1364 "mov x3,x5\n" /* tls */ 1365 "mov x4,x6\n" /* ctid */ 1366 "mov x8,%9\n" /* clone */ 1367 1368 "svc 0x0\n" 1369 1370 /* if (%r0 != 0) 1371 * return %r0; 1372 */ 1373 "cmp x0, #0\n" 1374 "bne 1f\n" 1375 1376 /* In the child, now. Call "fn(arg)". */ 1377 "ldp x1, x0, [sp], #16\n" 1378 "blr x1\n" 1379 1380 /* Call _exit(%r0). */ 1381 "mov x8, %10\n" 1382 "svc 0x0\n" 1383 "1:\n" 1384 1385 : "=r" (res) 1386 : "i"(-EINVAL), 1387 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1388 "r"(__ptid), "r"(__tls), "r"(__ctid), 1389 "i"(__NR_clone), "i"(__NR_exit) 1390 : "x30", "memory"); 1391 return res; 1392} 1393#elif defined(__powerpc64__) 1394uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1395 int *parent_tidptr, void *newtls, int *child_tidptr) { 1396 long long res; 1397// Stack frame structure. 1398#if SANITIZER_PPC64V1 1399// Back chain == 0 (SP + 112) 1400// Frame (112 bytes): 1401// Parameter save area (SP + 48), 8 doublewords 1402// TOC save area (SP + 40) 1403// Link editor doubleword (SP + 32) 1404// Compiler doubleword (SP + 24) 1405// LR save area (SP + 16) 1406// CR save area (SP + 8) 1407// Back chain (SP + 0) 1408# define FRAME_SIZE 112 1409# define FRAME_TOC_SAVE_OFFSET 40 1410#elif SANITIZER_PPC64V2 1411// Back chain == 0 (SP + 32) 1412// Frame (32 bytes): 1413// TOC save area (SP + 24) 1414// LR save area (SP + 16) 1415// CR save area (SP + 8) 1416// Back chain (SP + 0) 1417# define FRAME_SIZE 32 1418# define FRAME_TOC_SAVE_OFFSET 24 1419#else 1420# error "Unsupported PPC64 ABI" 1421#endif 1422 if (!fn || !child_stack) 1423 return -EINVAL; 1424 CHECK_EQ(0, (uptr)child_stack % 16); 1425 1426 register int (*__fn)(void *) __asm__("r3") = fn; 1427 register void *__cstack __asm__("r4") = child_stack; 1428 register int __flags __asm__("r5") = flags; 1429 register void *__arg __asm__("r6") = arg; 1430 register int *__ptidptr __asm__("r7") = parent_tidptr; 1431 register void *__newtls __asm__("r8") = newtls; 1432 register int *__ctidptr __asm__("r9") = child_tidptr; 1433 1434 __asm__ __volatile__( 1435 /* fn and arg are saved across the syscall */ 1436 "mr 28, %5\n\t" 1437 "mr 27, %8\n\t" 1438 1439 /* syscall 1440 r0 == __NR_clone 1441 r3 == flags 1442 r4 == child_stack 1443 r5 == parent_tidptr 1444 r6 == newtls 1445 r7 == child_tidptr */ 1446 "mr 3, %7\n\t" 1447 "mr 5, %9\n\t" 1448 "mr 6, %10\n\t" 1449 "mr 7, %11\n\t" 1450 "li 0, %3\n\t" 1451 "sc\n\t" 1452 1453 /* Test if syscall was successful */ 1454 "cmpdi cr1, 3, 0\n\t" 1455 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1456 "bne- cr1, 1f\n\t" 1457 1458 /* Set up stack frame */ 1459 "li 29, 0\n\t" 1460 "stdu 29, -8(1)\n\t" 1461 "stdu 1, -%12(1)\n\t" 1462 /* Do the function call */ 1463 "std 2, %13(1)\n\t" 1464#if SANITIZER_PPC64V1 1465 "ld 0, 0(28)\n\t" 1466 "ld 2, 8(28)\n\t" 1467 "mtctr 0\n\t" 1468#elif SANITIZER_PPC64V2 1469 "mr 12, 28\n\t" 1470 "mtctr 12\n\t" 1471#else 1472# error "Unsupported PPC64 ABI" 1473#endif 1474 "mr 3, 27\n\t" 1475 "bctrl\n\t" 1476 "ld 2, %13(1)\n\t" 1477 1478 /* Call _exit(r3) */ 1479 "li 0, %4\n\t" 1480 "sc\n\t" 1481 1482 /* Return to parent */ 1483 "1:\n\t" 1484 "mr %0, 3\n\t" 1485 : "=r" (res) 1486 : "0" (-1), 1487 "i" (EINVAL), 1488 "i" (__NR_clone), 1489 "i" (__NR_exit), 1490 "r" (__fn), 1491 "r" (__cstack), 1492 "r" (__flags), 1493 "r" (__arg), 1494 "r" (__ptidptr), 1495 "r" (__newtls), 1496 "r" (__ctidptr), 1497 "i" (FRAME_SIZE), 1498 "i" (FRAME_TOC_SAVE_OFFSET) 1499 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1500 return res; 1501} 1502#elif defined(__i386__) && SANITIZER_LINUX 1503uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1504 int *parent_tidptr, void *newtls, int *child_tidptr) { 1505 int res; 1506 if (!fn || !child_stack) 1507 return -EINVAL; 1508 CHECK_EQ(0, (uptr)child_stack % 16); 1509 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1510 ((unsigned int *)child_stack)[0] = (uptr)flags; 1511 ((unsigned int *)child_stack)[1] = (uptr)0; 1512 ((unsigned int *)child_stack)[2] = (uptr)fn; 1513 ((unsigned int *)child_stack)[3] = (uptr)arg; 1514 __asm__ __volatile__( 1515 /* %eax = syscall(%eax = SYSCALL(clone), 1516 * %ebx = flags, 1517 * %ecx = child_stack, 1518 * %edx = parent_tidptr, 1519 * %esi = new_tls, 1520 * %edi = child_tidptr) 1521 */ 1522 1523 /* Obtain flags */ 1524 "movl (%%ecx), %%ebx\n" 1525 /* Do the system call */ 1526 "pushl %%ebx\n" 1527 "pushl %%esi\n" 1528 "pushl %%edi\n" 1529 /* Remember the flag value. */ 1530 "movl %%ebx, (%%ecx)\n" 1531 "int $0x80\n" 1532 "popl %%edi\n" 1533 "popl %%esi\n" 1534 "popl %%ebx\n" 1535 1536 /* if (%eax != 0) 1537 * return; 1538 */ 1539 1540 "test %%eax,%%eax\n" 1541 "jnz 1f\n" 1542 1543 /* terminate the stack frame */ 1544 "xorl %%ebp,%%ebp\n" 1545 /* Call FN. */ 1546 "call *%%ebx\n" 1547#ifdef PIC 1548 "call here\n" 1549 "here:\n" 1550 "popl %%ebx\n" 1551 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1552#endif 1553 /* Call exit */ 1554 "movl %%eax, %%ebx\n" 1555 "movl %2, %%eax\n" 1556 "int $0x80\n" 1557 "1:\n" 1558 : "=a" (res) 1559 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1560 "c"(child_stack), 1561 "d"(parent_tidptr), 1562 "S"(newtls), 1563 "D"(child_tidptr) 1564 : "memory"); 1565 return res; 1566} 1567#elif defined(__arm__) && SANITIZER_LINUX 1568uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1569 int *parent_tidptr, void *newtls, int *child_tidptr) { 1570 unsigned int res; 1571 if (!fn || !child_stack) 1572 return -EINVAL; 1573 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1574 ((unsigned int *)child_stack)[0] = (uptr)fn; 1575 ((unsigned int *)child_stack)[1] = (uptr)arg; 1576 register int r0 __asm__("r0") = flags; 1577 register void *r1 __asm__("r1") = child_stack; 1578 register int *r2 __asm__("r2") = parent_tidptr; 1579 register void *r3 __asm__("r3") = newtls; 1580 register int *r4 __asm__("r4") = child_tidptr; 1581 register int r7 __asm__("r7") = __NR_clone; 1582 1583#if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) 1584# define ARCH_HAS_BX 1585#endif 1586#if __ARM_ARCH > 4 1587# define ARCH_HAS_BLX 1588#endif 1589 1590#ifdef ARCH_HAS_BX 1591# ifdef ARCH_HAS_BLX 1592# define BLX(R) "blx " #R "\n" 1593# else 1594# define BLX(R) "mov lr, pc; bx " #R "\n" 1595# endif 1596#else 1597# define BLX(R) "mov lr, pc; mov pc," #R "\n" 1598#endif 1599 1600 __asm__ __volatile__( 1601 /* %r0 = syscall(%r7 = SYSCALL(clone), 1602 * %r0 = flags, 1603 * %r1 = child_stack, 1604 * %r2 = parent_tidptr, 1605 * %r3 = new_tls, 1606 * %r4 = child_tidptr) 1607 */ 1608 1609 /* Do the system call */ 1610 "swi 0x0\n" 1611 1612 /* if (%r0 != 0) 1613 * return %r0; 1614 */ 1615 "cmp r0, #0\n" 1616 "bne 1f\n" 1617 1618 /* In the child, now. Call "fn(arg)". */ 1619 "ldr r0, [sp, #4]\n" 1620 "ldr ip, [sp], #8\n" 1621 BLX(ip) 1622 /* Call _exit(%r0). */ 1623 "mov r7, %7\n" 1624 "swi 0x0\n" 1625 "1:\n" 1626 "mov %0, r0\n" 1627 : "=r"(res) 1628 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), 1629 "i"(__NR_exit) 1630 : "memory"); 1631 return res; 1632} 1633#endif // defined(__x86_64__) && SANITIZER_LINUX 1634 1635#if SANITIZER_LINUX 1636int internal_uname(struct utsname *buf) { 1637 return internal_syscall(SYSCALL(uname), buf); 1638} 1639#endif 1640 1641#if SANITIZER_ANDROID 1642#if __ANDROID_API__ < 21 1643extern "C" __attribute__((weak)) int dl_iterate_phdr( 1644 int (*)(struct dl_phdr_info *, size_t, void *), void *); 1645#endif 1646 1647static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, 1648 void *data) { 1649 // Any name starting with "lib" indicates a bug in L where library base names 1650 // are returned instead of paths. 1651 if (info->dlpi_name && info->dlpi_name[0] == 'l' && 1652 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { 1653 *(bool *)data = true; 1654 return 1; 1655 } 1656 return 0; 1657} 1658 1659static atomic_uint32_t android_api_level; 1660 1661static AndroidApiLevel AndroidDetectApiLevelStatic() { 1662#if __ANDROID_API__ <= 19 1663 return ANDROID_KITKAT; 1664#elif __ANDROID_API__ <= 22 1665 return ANDROID_LOLLIPOP_MR1; 1666#else 1667 return ANDROID_POST_LOLLIPOP; 1668#endif 1669} 1670 1671static AndroidApiLevel AndroidDetectApiLevel() { 1672 if (!&dl_iterate_phdr) 1673 return ANDROID_KITKAT; // K or lower 1674 bool base_name_seen = false; 1675 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); 1676 if (base_name_seen) 1677 return ANDROID_LOLLIPOP_MR1; // L MR1 1678 return ANDROID_POST_LOLLIPOP; // post-L 1679 // Plain L (API level 21) is completely broken wrt ASan and not very 1680 // interesting to detect. 1681} 1682 1683extern "C" __attribute__((weak)) void* _DYNAMIC; 1684 1685AndroidApiLevel AndroidGetApiLevel() { 1686 AndroidApiLevel level = 1687 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); 1688 if (level) return level; 1689 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic() 1690 : AndroidDetectApiLevel(); 1691 atomic_store(&android_api_level, level, memory_order_relaxed); 1692 return level; 1693} 1694 1695#endif 1696 1697static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1698 switch (signum) { 1699 case SIGABRT: 1700 return common_flags()->handle_abort; 1701 case SIGILL: 1702 return common_flags()->handle_sigill; 1703 case SIGTRAP: 1704 return common_flags()->handle_sigtrap; 1705 case SIGFPE: 1706 return common_flags()->handle_sigfpe; 1707 case SIGSEGV: 1708 return common_flags()->handle_segv; 1709 case SIGBUS: 1710 return common_flags()->handle_sigbus; 1711 } 1712 return kHandleSignalNo; 1713} 1714 1715HandleSignalMode GetHandleSignalMode(int signum) { 1716 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1717 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1718 return kHandleSignalExclusive; 1719 return result; 1720} 1721 1722#if !SANITIZER_GO 1723void *internal_start_thread(void *(*func)(void *arg), void *arg) { 1724 // Start the thread with signals blocked, otherwise it can steal user signals. 1725 __sanitizer_sigset_t set, old; 1726 internal_sigfillset(&set); 1727#if SANITIZER_LINUX && !SANITIZER_ANDROID 1728 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 1729 // on any thread, setuid call hangs (see test/tsan/setuid.c). 1730 internal_sigdelset(&set, 33); 1731#endif 1732 internal_sigprocmask(SIG_SETMASK, &set, &old); 1733 void *th; 1734 real_pthread_create(&th, nullptr, func, arg); 1735 internal_sigprocmask(SIG_SETMASK, &old, nullptr); 1736 return th; 1737} 1738 1739void internal_join_thread(void *th) { 1740 real_pthread_join(th, nullptr); 1741} 1742#else 1743void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; } 1744 1745void internal_join_thread(void *th) {} 1746#endif 1747 1748#if defined(__aarch64__) 1749// Android headers in the older NDK releases miss this definition. 1750struct __sanitizer_esr_context { 1751 struct _aarch64_ctx head; 1752 uint64_t esr; 1753}; 1754 1755static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1756 static const u32 kEsrMagic = 0x45535201; 1757 u8 *aux = ucontext->uc_mcontext.__reserved; 1758 while (true) { 1759 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1760 if (ctx->size == 0) break; 1761 if (ctx->magic == kEsrMagic) { 1762 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1763 return true; 1764 } 1765 aux += ctx->size; 1766 } 1767 return false; 1768} 1769#endif 1770 1771#if SANITIZER_OPENBSD 1772using Context = sigcontext; 1773#else 1774using Context = ucontext_t; 1775#endif 1776 1777SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1778 Context *ucontext = (Context *)context; 1779#if defined(__x86_64__) || defined(__i386__) 1780 static const uptr PF_WRITE = 1U << 1; 1781#if SANITIZER_FREEBSD 1782 uptr err = ucontext->uc_mcontext.mc_err; 1783#elif SANITIZER_NETBSD 1784 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1785#elif SANITIZER_OPENBSD 1786 uptr err = ucontext->sc_err; 1787#elif SANITIZER_SOLARIS && defined(__i386__) 1788 const int Err = 13; 1789 uptr err = ucontext->uc_mcontext.gregs[Err]; 1790#else 1791 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1792#endif // SANITIZER_FREEBSD 1793 return err & PF_WRITE ? WRITE : READ; 1794#elif defined(__mips__) 1795 uint32_t *exception_source; 1796 uint32_t faulty_instruction; 1797 uint32_t op_code; 1798 1799 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 1800 faulty_instruction = (uint32_t)(*exception_source); 1801 1802 op_code = (faulty_instruction >> 26) & 0x3f; 1803 1804 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 1805 switch (op_code) { 1806 case 0x28: // sb 1807 case 0x29: // sh 1808 case 0x2b: // sw 1809 case 0x3f: // sd 1810#if __mips_isa_rev < 6 1811 case 0x2c: // sdl 1812 case 0x2d: // sdr 1813 case 0x2a: // swl 1814 case 0x2e: // swr 1815#endif 1816 return SignalContext::WRITE; 1817 1818 case 0x20: // lb 1819 case 0x24: // lbu 1820 case 0x21: // lh 1821 case 0x25: // lhu 1822 case 0x23: // lw 1823 case 0x27: // lwu 1824 case 0x37: // ld 1825#if __mips_isa_rev < 6 1826 case 0x1a: // ldl 1827 case 0x1b: // ldr 1828 case 0x22: // lwl 1829 case 0x26: // lwr 1830#endif 1831 return SignalContext::READ; 1832#if __mips_isa_rev == 6 1833 case 0x3b: // pcrel 1834 op_code = (faulty_instruction >> 19) & 0x3; 1835 switch (op_code) { 1836 case 0x1: // lwpc 1837 case 0x2: // lwupc 1838 return SignalContext::READ; 1839 } 1840#endif 1841 } 1842 return SignalContext::UNKNOWN; 1843#elif defined(__arm__) 1844 static const uptr FSR_WRITE = 1U << 11; 1845 uptr fsr = ucontext->uc_mcontext.error_code; 1846 return fsr & FSR_WRITE ? WRITE : READ; 1847#elif defined(__aarch64__) 1848 static const u64 ESR_ELx_WNR = 1U << 6; 1849 u64 esr; 1850 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN; 1851 return esr & ESR_ELx_WNR ? WRITE : READ; 1852#elif defined(__sparc__) 1853 // Decode the instruction to determine the access type. 1854 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 1855#if SANITIZER_SOLARIS 1856 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 1857#else 1858 // Historical BSDism here. 1859 struct sigcontext *scontext = (struct sigcontext *)context; 1860#if defined(__arch64__) 1861 uptr pc = scontext->sigc_regs.tpc; 1862#else 1863 uptr pc = scontext->si_regs.pc; 1864#endif 1865#endif 1866 u32 instr = *(u32 *)pc; 1867 return (instr >> 21) & 1 ? WRITE: READ; 1868#elif defined(__riscv) 1869 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC]; 1870 unsigned faulty_instruction = *(uint16_t *)pc; 1871 1872#if defined(__riscv_compressed) 1873 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction 1874 // set op_bits to the instruction bits [1, 0, 15, 14, 13] 1875 unsigned op_bits = 1876 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13); 1877 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive 1878 switch (op_bits) { 1879 case 0b10'010: // c.lwsp (rd != x0) 1880#if __riscv_xlen == 64 1881 case 0b10'011: // c.ldsp (rd != x0) 1882#endif 1883 return rd ? SignalContext::READ : SignalContext::UNKNOWN; 1884 case 0b00'010: // c.lw 1885#if __riscv_flen >= 32 && __riscv_xlen == 32 1886 case 0b10'011: // c.flwsp 1887#endif 1888#if __riscv_flen >= 32 || __riscv_xlen == 64 1889 case 0b00'011: // c.flw / c.ld 1890#endif 1891#if __riscv_flen == 64 1892 case 0b00'001: // c.fld 1893 case 0b10'001: // c.fldsp 1894#endif 1895 return SignalContext::READ; 1896 case 0b00'110: // c.sw 1897 case 0b10'110: // c.swsp 1898#if __riscv_flen >= 32 || __riscv_xlen == 64 1899 case 0b00'111: // c.fsw / c.sd 1900 case 0b10'111: // c.fswsp / c.sdsp 1901#endif 1902#if __riscv_flen == 64 1903 case 0b00'101: // c.fsd 1904 case 0b10'101: // c.fsdsp 1905#endif 1906 return SignalContext::WRITE; 1907 default: 1908 return SignalContext::UNKNOWN; 1909 } 1910 } 1911#endif 1912 1913 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits 1914 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive 1915 switch (opcode) { 1916 case 0b0000011: // loads 1917 switch (funct3) { 1918 case 0b000: // lb 1919 case 0b001: // lh 1920 case 0b010: // lw 1921#if __riscv_xlen == 64 1922 case 0b011: // ld 1923#endif 1924 case 0b100: // lbu 1925 case 0b101: // lhu 1926 return SignalContext::READ; 1927 default: 1928 return SignalContext::UNKNOWN; 1929 } 1930 case 0b0100011: // stores 1931 switch (funct3) { 1932 case 0b000: // sb 1933 case 0b001: // sh 1934 case 0b010: // sw 1935#if __riscv_xlen == 64 1936 case 0b011: // sd 1937#endif 1938 return SignalContext::WRITE; 1939 default: 1940 return SignalContext::UNKNOWN; 1941 } 1942#if __riscv_flen >= 32 1943 case 0b0000111: // floating-point loads 1944 switch (funct3) { 1945 case 0b010: // flw 1946#if __riscv_flen == 64 1947 case 0b011: // fld 1948#endif 1949 return SignalContext::READ; 1950 default: 1951 return SignalContext::UNKNOWN; 1952 } 1953 case 0b0100111: // floating-point stores 1954 switch (funct3) { 1955 case 0b010: // fsw 1956#if __riscv_flen == 64 1957 case 0b011: // fsd 1958#endif 1959 return SignalContext::WRITE; 1960 default: 1961 return SignalContext::UNKNOWN; 1962 } 1963#endif 1964 default: 1965 return SignalContext::UNKNOWN; 1966 } 1967#else 1968 (void)ucontext; 1969 return UNKNOWN; // FIXME: Implement. 1970#endif 1971} 1972 1973bool SignalContext::IsTrueFaultingAddress() const { 1974 auto si = static_cast<const siginfo_t *>(siginfo); 1975 // SIGSEGV signals without a true fault address have si_code set to 128. 1976 return si->si_signo == SIGSEGV && si->si_code != 128; 1977} 1978 1979void SignalContext::DumpAllRegisters(void *context) { 1980 // FIXME: Implement this. 1981} 1982 1983static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 1984#if SANITIZER_NETBSD 1985 // This covers all NetBSD architectures 1986 ucontext_t *ucontext = (ucontext_t *)context; 1987 *pc = _UC_MACHINE_PC(ucontext); 1988 *bp = _UC_MACHINE_FP(ucontext); 1989 *sp = _UC_MACHINE_SP(ucontext); 1990#elif defined(__arm__) 1991 ucontext_t *ucontext = (ucontext_t*)context; 1992 *pc = ucontext->uc_mcontext.arm_pc; 1993 *bp = ucontext->uc_mcontext.arm_fp; 1994 *sp = ucontext->uc_mcontext.arm_sp; 1995#elif defined(__aarch64__) 1996 ucontext_t *ucontext = (ucontext_t*)context; 1997 *pc = ucontext->uc_mcontext.pc; 1998 *bp = ucontext->uc_mcontext.regs[29]; 1999 *sp = ucontext->uc_mcontext.sp; 2000#elif defined(__hppa__) 2001 ucontext_t *ucontext = (ucontext_t*)context; 2002 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 2003 /* GCC uses %r3 whenever a frame pointer is needed. */ 2004 *bp = ucontext->uc_mcontext.sc_gr[3]; 2005 *sp = ucontext->uc_mcontext.sc_gr[30]; 2006#elif defined(__x86_64__) 2007# if SANITIZER_FREEBSD 2008 ucontext_t *ucontext = (ucontext_t*)context; 2009 *pc = ucontext->uc_mcontext.mc_rip; 2010 *bp = ucontext->uc_mcontext.mc_rbp; 2011 *sp = ucontext->uc_mcontext.mc_rsp; 2012#elif SANITIZER_OPENBSD 2013 sigcontext *ucontext = (sigcontext *)context; 2014 *pc = ucontext->sc_rip; 2015 *bp = ucontext->sc_rbp; 2016 *sp = ucontext->sc_rsp; 2017# else 2018 ucontext_t *ucontext = (ucontext_t*)context; 2019 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 2020 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 2021 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 2022# endif 2023#elif defined(__i386__) 2024# if SANITIZER_FREEBSD 2025 ucontext_t *ucontext = (ucontext_t*)context; 2026 *pc = ucontext->uc_mcontext.mc_eip; 2027 *bp = ucontext->uc_mcontext.mc_ebp; 2028 *sp = ucontext->uc_mcontext.mc_esp; 2029#elif SANITIZER_OPENBSD 2030 sigcontext *ucontext = (sigcontext *)context; 2031 *pc = ucontext->sc_eip; 2032 *bp = ucontext->sc_ebp; 2033 *sp = ucontext->sc_esp; 2034# else 2035 ucontext_t *ucontext = (ucontext_t*)context; 2036# if SANITIZER_SOLARIS 2037 /* Use the numeric values: the symbolic ones are undefined by llvm 2038 include/llvm/Support/Solaris.h. */ 2039# ifndef REG_EIP 2040# define REG_EIP 14 // REG_PC 2041# endif 2042# ifndef REG_EBP 2043# define REG_EBP 6 // REG_FP 2044# endif 2045# ifndef REG_UESP 2046# define REG_UESP 17 // REG_SP 2047# endif 2048# endif 2049 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 2050 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 2051 *sp = ucontext->uc_mcontext.gregs[REG_UESP]; 2052# endif 2053#elif defined(__powerpc__) || defined(__powerpc64__) 2054 ucontext_t *ucontext = (ucontext_t*)context; 2055 *pc = ucontext->uc_mcontext.regs->nip; 2056 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 2057 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 2058 // pointer, but GCC always uses r31 when we need a frame pointer. 2059 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 2060#elif defined(__sparc__) 2061#if defined(__arch64__) || defined(__sparcv9) 2062#define STACK_BIAS 2047 2063#else 2064#define STACK_BIAS 0 2065# endif 2066# if SANITIZER_SOLARIS 2067 ucontext_t *ucontext = (ucontext_t *)context; 2068 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 2069 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS; 2070#else 2071 // Historical BSDism here. 2072 struct sigcontext *scontext = (struct sigcontext *)context; 2073#if defined(__arch64__) 2074 *pc = scontext->sigc_regs.tpc; 2075 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS; 2076#else 2077 *pc = scontext->si_regs.pc; 2078 *sp = scontext->si_regs.u_regs[14]; 2079#endif 2080# endif 2081 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS; 2082#elif defined(__mips__) 2083 ucontext_t *ucontext = (ucontext_t*)context; 2084 *pc = ucontext->uc_mcontext.pc; 2085 *bp = ucontext->uc_mcontext.gregs[30]; 2086 *sp = ucontext->uc_mcontext.gregs[29]; 2087#elif defined(__s390__) 2088 ucontext_t *ucontext = (ucontext_t*)context; 2089# if defined(__s390x__) 2090 *pc = ucontext->uc_mcontext.psw.addr; 2091# else 2092 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 2093# endif 2094 *bp = ucontext->uc_mcontext.gregs[11]; 2095 *sp = ucontext->uc_mcontext.gregs[15]; 2096#elif defined(__riscv) 2097 ucontext_t *ucontext = (ucontext_t*)context; 2098 *pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2099 *bp = ucontext->uc_mcontext.__gregs[REG_S0]; 2100 *sp = ucontext->uc_mcontext.__gregs[REG_SP]; 2101#else 2102# error "Unsupported arch" 2103#endif 2104} 2105 2106void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 2107 2108void InitializePlatformEarly() { 2109 // Do nothing. 2110} 2111 2112void MaybeReexec() { 2113 // No need to re-exec on Linux. 2114} 2115 2116void CheckASLR() { 2117#if SANITIZER_NETBSD 2118 int mib[3]; 2119 int paxflags; 2120 uptr len = sizeof(paxflags); 2121 2122 mib[0] = CTL_PROC; 2123 mib[1] = internal_getpid(); 2124 mib[2] = PROC_PID_PAXFLAGS; 2125 2126 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2127 Printf("sysctl failed\n"); 2128 Die(); 2129 } 2130 2131 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2132 Printf("This sanitizer is not compatible with enabled ASLR.\n" 2133 "To disable ASLR, please run \"paxctl +a %s\" and try again.\n", 2134 GetArgv()[0]); 2135 Die(); 2136 } 2137#elif SANITIZER_PPC64V2 2138 // Disable ASLR for Linux PPC64LE. 2139 int old_personality = personality(0xffffffff); 2140 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2141 VReport(1, "WARNING: Program is being run with address space layout " 2142 "randomization (ASLR) enabled which prevents the thread and " 2143 "memory sanitizers from working on powerpc64le.\n" 2144 "ASLR will be disabled and the program re-executed.\n"); 2145 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2146 ReExec(); 2147 } 2148#elif SANITIZER_FREEBSD 2149 int aslr_pie; 2150 uptr len = sizeof(aslr_pie); 2151#if SANITIZER_WORDSIZE == 64 2152 if (UNLIKELY(internal_sysctlbyname("kern.elf64.aslr.pie_enable", 2153 &aslr_pie, &len, NULL, 0) == -1)) { 2154 // We're making things less 'dramatic' here since 2155 // the OID is not necessarily guaranteed to be here 2156 // just yet regarding FreeBSD release 2157 return; 2158 } 2159 2160 if (aslr_pie > 0) { 2161 Printf("This sanitizer is not compatible with enabled ASLR " 2162 "and binaries compiled with PIE\n"); 2163 Die(); 2164 } 2165#endif 2166 // there might be 32 bits compat for 64 bits 2167 if (UNLIKELY(internal_sysctlbyname("kern.elf32.aslr.pie_enable", 2168 &aslr_pie, &len, NULL, 0) == -1)) { 2169 return; 2170 } 2171 2172 if (aslr_pie > 0) { 2173 Printf("This sanitizer is not compatible with enabled ASLR " 2174 "and binaries compiled with PIE\n"); 2175 Die(); 2176 } 2177#else 2178 // Do nothing 2179#endif 2180} 2181 2182void CheckMPROTECT() { 2183#if SANITIZER_NETBSD 2184 int mib[3]; 2185 int paxflags; 2186 uptr len = sizeof(paxflags); 2187 2188 mib[0] = CTL_PROC; 2189 mib[1] = internal_getpid(); 2190 mib[2] = PROC_PID_PAXFLAGS; 2191 2192 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2193 Printf("sysctl failed\n"); 2194 Die(); 2195 } 2196 2197 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2198 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2199 Die(); 2200 } 2201#else 2202 // Do nothing 2203#endif 2204} 2205 2206void PrintModuleMap() { } 2207 2208void CheckNoDeepBind(const char *filename, int flag) { 2209#ifdef RTLD_DEEPBIND 2210 if (flag & RTLD_DEEPBIND) { 2211 Report( 2212 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2213 " which is incompatible with sanitizer runtime " 2214 "(see https://github.com/google/sanitizers/issues/611 for details" 2215 "). If you want to run %s library under sanitizers please remove " 2216 "RTLD_DEEPBIND from dlopen flags.\n", 2217 filename, filename); 2218 Die(); 2219 } 2220#endif 2221} 2222 2223uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2224 uptr *largest_gap_found, 2225 uptr *max_occupied_addr) { 2226 UNREACHABLE("FindAvailableMemoryRange is not available"); 2227 return 0; 2228} 2229 2230bool GetRandom(void *buffer, uptr length, bool blocking) { 2231 if (!buffer || !length || length > 256) 2232 return false; 2233#if SANITIZER_USE_GETENTROPY 2234 uptr rnd = getentropy(buffer, length); 2235 int rverrno = 0; 2236 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2237 return false; 2238 else if (rnd == 0) 2239 return true; 2240#endif // SANITIZER_USE_GETENTROPY 2241 2242#if SANITIZER_USE_GETRANDOM 2243 static atomic_uint8_t skip_getrandom_syscall; 2244 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2245 // Up to 256 bytes, getrandom will not be interrupted. 2246 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2247 blocking ? 0 : GRND_NONBLOCK); 2248 int rverrno = 0; 2249 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2250 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2251 else if (res == length) 2252 return true; 2253 } 2254#endif // SANITIZER_USE_GETRANDOM 2255 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2256 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2257 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2258 if (internal_iserror(fd)) 2259 return false; 2260 uptr res = internal_read(fd, buffer, length); 2261 if (internal_iserror(res)) 2262 return false; 2263 internal_close(fd); 2264 return true; 2265} 2266 2267} // namespace __sanitizer 2268 2269#endif 2270