1284345Ssjg//===-- sanitizer_linux.cpp -----------------------------------------------===// 2284345Ssjg// 3284345Ssjg// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4284345Ssjg// See https://llvm.org/LICENSE.txt for license information. 5284345Ssjg// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6284345Ssjg// 7284345Ssjg//===----------------------------------------------------------------------===// 8284345Ssjg// 9284345Ssjg// This file is shared between AddressSanitizer and ThreadSanitizer 10284345Ssjg// run-time libraries and implements linux-specific functions from 11284345Ssjg// 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 SANITIZER_MIPS64 38#include <asm/unistd.h> 39#include <sys/types.h> 40#define stat kernel_stat 41#if SANITIZER_GO 42#undef st_atime 43#undef st_mtime 44#undef st_ctime 45#define st_atime st_atim 46#define st_mtime st_mtim 47#define st_ctime st_ctim 48#endif 49#include <asm/stat.h> 50#undef stat 51#endif 52 53#include <dlfcn.h> 54#include <errno.h> 55#include <fcntl.h> 56#include <link.h> 57#include <pthread.h> 58#include <sched.h> 59#include <signal.h> 60#include <sys/mman.h> 61#include <sys/param.h> 62#if !SANITIZER_SOLARIS 63#include <sys/ptrace.h> 64#endif 65#include <sys/resource.h> 66#include <sys/stat.h> 67#include <sys/syscall.h> 68#include <sys/time.h> 69#include <sys/types.h> 70#include <ucontext.h> 71#include <unistd.h> 72 73#if SANITIZER_LINUX 74#include <sys/utsname.h> 75#endif 76 77#if SANITIZER_LINUX && !SANITIZER_ANDROID 78#include <sys/personality.h> 79#endif 80 81#if SANITIZER_LINUX && defined(__loongarch__) 82# include <sys/sysmacros.h> 83#endif 84 85#if SANITIZER_FREEBSD 86#include <sys/exec.h> 87#include <sys/procctl.h> 88#include <sys/sysctl.h> 89#include <machine/atomic.h> 90extern "C" { 91// <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on 92// FreeBSD 9.2 and 10.0. 93#include <sys/umtx.h> 94} 95#include <sys/thr.h> 96#endif // SANITIZER_FREEBSD 97 98#if SANITIZER_NETBSD 99#include <limits.h> // For NAME_MAX 100#include <sys/sysctl.h> 101#include <sys/exec.h> 102extern struct ps_strings *__ps_strings; 103#endif // SANITIZER_NETBSD 104 105#if SANITIZER_SOLARIS 106#include <stdlib.h> 107#include <thread.h> 108#define environ _environ 109#endif 110 111extern char **environ; 112 113#if SANITIZER_LINUX 114// <linux/time.h> 115struct kernel_timeval { 116 long tv_sec; 117 long tv_usec; 118}; 119 120// <linux/futex.h> is broken on some linux distributions. 121const int FUTEX_WAIT = 0; 122const int FUTEX_WAKE = 1; 123const int FUTEX_PRIVATE_FLAG = 128; 124const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG; 125const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG; 126#endif // SANITIZER_LINUX 127 128// Are we using 32-bit or 64-bit Linux syscalls? 129// x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 130// but it still needs to use 64-bit syscalls. 131#if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \ 132 SANITIZER_WORDSIZE == 64 || \ 133 (defined(__mips__) && _MIPS_SIM == _ABIN32)) 134# define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 135#else 136# define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 137#endif 138 139// Note : FreeBSD had implemented both 140// Linux apis, available from 141// future 12.x version most likely 142#if SANITIZER_LINUX && defined(__NR_getrandom) 143# if !defined(GRND_NONBLOCK) 144# define GRND_NONBLOCK 1 145# endif 146# define SANITIZER_USE_GETRANDOM 1 147#else 148# define SANITIZER_USE_GETRANDOM 0 149#endif // SANITIZER_LINUX && defined(__NR_getrandom) 150 151#if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000 152# define SANITIZER_USE_GETENTROPY 1 153#else 154# define SANITIZER_USE_GETENTROPY 0 155#endif 156 157namespace __sanitizer { 158 159void SetSigProcMask(__sanitizer_sigset_t *set, __sanitizer_sigset_t *old) { 160 CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, set, old)); 161} 162 163ScopedBlockSignals::ScopedBlockSignals(__sanitizer_sigset_t *copy) { 164 __sanitizer_sigset_t set; 165 internal_sigfillset(&set); 166# if SANITIZER_LINUX && !SANITIZER_ANDROID 167 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked 168 // on any thread, setuid call hangs. 169 // See test/sanitizer_common/TestCases/Linux/setuid.c. 170 internal_sigdelset(&set, 33); 171# endif 172# if SANITIZER_LINUX 173 // Seccomp-BPF-sandboxed processes rely on SIGSYS to handle trapped syscalls. 174 // If this signal is blocked, such calls cannot be handled and the process may 175 // hang. 176 internal_sigdelset(&set, 31); 177# endif 178 SetSigProcMask(&set, &saved_); 179 if (copy) 180 internal_memcpy(copy, &saved_, sizeof(saved_)); 181} 182 183ScopedBlockSignals::~ScopedBlockSignals() { SetSigProcMask(&saved_, nullptr); } 184 185# if SANITIZER_LINUX && defined(__x86_64__) 186# include "sanitizer_syscall_linux_x86_64.inc" 187# elif SANITIZER_LINUX && SANITIZER_RISCV64 188# include "sanitizer_syscall_linux_riscv64.inc" 189# elif SANITIZER_LINUX && defined(__aarch64__) 190# include "sanitizer_syscall_linux_aarch64.inc" 191# elif SANITIZER_LINUX && defined(__arm__) 192# include "sanitizer_syscall_linux_arm.inc" 193# elif SANITIZER_LINUX && defined(__hexagon__) 194# include "sanitizer_syscall_linux_hexagon.inc" 195# elif SANITIZER_LINUX && SANITIZER_LOONGARCH64 196# include "sanitizer_syscall_linux_loongarch64.inc" 197# else 198# include "sanitizer_syscall_generic.inc" 199# endif 200 201// --------------- sanitizer_libc.h 202#if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 203#if !SANITIZER_S390 204uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd, 205 u64 offset) { 206#if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 207 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd, 208 offset); 209#else 210 // mmap2 specifies file offset in 4096-byte units. 211 CHECK(IsAligned(offset, 4096)); 212 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd, 213 offset / 4096); 214#endif 215} 216#endif // !SANITIZER_S390 217 218uptr internal_munmap(void *addr, uptr length) { 219 return internal_syscall(SYSCALL(munmap), (uptr)addr, length); 220} 221 222#if SANITIZER_LINUX 223uptr internal_mremap(void *old_address, uptr old_size, uptr new_size, int flags, 224 void *new_address) { 225 return internal_syscall(SYSCALL(mremap), (uptr)old_address, old_size, 226 new_size, flags, (uptr)new_address); 227} 228#endif 229 230int internal_mprotect(void *addr, uptr length, int prot) { 231 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot); 232} 233 234int internal_madvise(uptr addr, uptr length, int advice) { 235 return internal_syscall(SYSCALL(madvise), addr, length, advice); 236} 237 238uptr internal_close(fd_t fd) { 239 return internal_syscall(SYSCALL(close), fd); 240} 241 242uptr internal_open(const char *filename, int flags) { 243# if SANITIZER_LINUX 244 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags); 245#else 246 return internal_syscall(SYSCALL(open), (uptr)filename, flags); 247#endif 248} 249 250uptr internal_open(const char *filename, int flags, u32 mode) { 251# if SANITIZER_LINUX 252 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags, 253 mode); 254#else 255 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode); 256#endif 257} 258 259uptr internal_read(fd_t fd, void *buf, uptr count) { 260 sptr res; 261 HANDLE_EINTR(res, 262 (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count)); 263 return res; 264} 265 266uptr internal_write(fd_t fd, const void *buf, uptr count) { 267 sptr res; 268 HANDLE_EINTR(res, 269 (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count)); 270 return res; 271} 272 273uptr internal_ftruncate(fd_t fd, uptr size) { 274 sptr res; 275 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd, 276 (OFF_T)size)); 277 return res; 278} 279 280#if (!SANITIZER_LINUX_USES_64BIT_SYSCALLS || SANITIZER_SPARC) && SANITIZER_LINUX 281static void stat64_to_stat(struct stat64 *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 out->st_atime = in->st_atime; 294 out->st_mtime = in->st_mtime; 295 out->st_ctime = in->st_ctime; 296} 297#endif 298 299#if SANITIZER_LINUX && defined(__loongarch__) 300static void statx_to_stat(struct statx *in, struct stat *out) { 301 internal_memset(out, 0, sizeof(*out)); 302 out->st_dev = makedev(in->stx_dev_major, in->stx_dev_minor); 303 out->st_ino = in->stx_ino; 304 out->st_mode = in->stx_mode; 305 out->st_nlink = in->stx_nlink; 306 out->st_uid = in->stx_uid; 307 out->st_gid = in->stx_gid; 308 out->st_rdev = makedev(in->stx_rdev_major, in->stx_rdev_minor); 309 out->st_size = in->stx_size; 310 out->st_blksize = in->stx_blksize; 311 out->st_blocks = in->stx_blocks; 312 out->st_atime = in->stx_atime.tv_sec; 313 out->st_atim.tv_nsec = in->stx_atime.tv_nsec; 314 out->st_mtime = in->stx_mtime.tv_sec; 315 out->st_mtim.tv_nsec = in->stx_mtime.tv_nsec; 316 out->st_ctime = in->stx_ctime.tv_sec; 317 out->st_ctim.tv_nsec = in->stx_ctime.tv_nsec; 318} 319#endif 320 321#if SANITIZER_MIPS64 322// Undefine compatibility macros from <sys/stat.h> 323// so that they would not clash with the kernel_stat 324// st_[a|m|c]time fields 325#if !SANITIZER_GO 326#undef st_atime 327#undef st_mtime 328#undef st_ctime 329#endif 330#if defined(SANITIZER_ANDROID) 331// Bionic sys/stat.h defines additional macros 332// for compatibility with the old NDKs and 333// they clash with the kernel_stat structure 334// st_[a|m|c]time_nsec fields. 335#undef st_atime_nsec 336#undef st_mtime_nsec 337#undef st_ctime_nsec 338#endif 339static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) { 340 internal_memset(out, 0, sizeof(*out)); 341 out->st_dev = in->st_dev; 342 out->st_ino = in->st_ino; 343 out->st_mode = in->st_mode; 344 out->st_nlink = in->st_nlink; 345 out->st_uid = in->st_uid; 346 out->st_gid = in->st_gid; 347 out->st_rdev = in->st_rdev; 348 out->st_size = in->st_size; 349 out->st_blksize = in->st_blksize; 350 out->st_blocks = in->st_blocks; 351#if defined(__USE_MISC) || \ 352 defined(__USE_XOPEN2K8) || \ 353 defined(SANITIZER_ANDROID) 354 out->st_atim.tv_sec = in->st_atime; 355 out->st_atim.tv_nsec = in->st_atime_nsec; 356 out->st_mtim.tv_sec = in->st_mtime; 357 out->st_mtim.tv_nsec = in->st_mtime_nsec; 358 out->st_ctim.tv_sec = in->st_ctime; 359 out->st_ctim.tv_nsec = in->st_ctime_nsec; 360#else 361 out->st_atime = in->st_atime; 362 out->st_atimensec = in->st_atime_nsec; 363 out->st_mtime = in->st_mtime; 364 out->st_mtimensec = in->st_mtime_nsec; 365 out->st_ctime = in->st_ctime; 366 out->st_atimensec = in->st_ctime_nsec; 367#endif 368} 369#endif 370 371uptr internal_stat(const char *path, void *buf) { 372# if SANITIZER_FREEBSD 373 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0); 374# elif SANITIZER_LINUX 375# if defined(__loongarch__) 376 struct statx bufx; 377 int res = internal_syscall(SYSCALL(statx), AT_FDCWD, (uptr)path, 378 AT_NO_AUTOMOUNT, STATX_BASIC_STATS, (uptr)&bufx); 379 statx_to_stat(&bufx, (struct stat *)buf); 380 return res; 381# elif (SANITIZER_WORDSIZE == 64 || SANITIZER_X32 || \ 382 (defined(__mips__) && _MIPS_SIM == _ABIN32)) && \ 383 !SANITIZER_SPARC 384 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 385 0); 386# else 387 struct stat64 buf64; 388 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 389 (uptr)&buf64, 0); 390 stat64_to_stat(&buf64, (struct stat *)buf); 391 return res; 392# endif 393# else 394 struct stat64 buf64; 395 int res = internal_syscall(SYSCALL(stat64), path, &buf64); 396 stat64_to_stat(&buf64, (struct stat *)buf); 397 return res; 398# endif 399} 400 401uptr internal_lstat(const char *path, void *buf) { 402# if SANITIZER_FREEBSD 403 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 404 AT_SYMLINK_NOFOLLOW); 405# elif SANITIZER_LINUX 406# if defined(__loongarch__) 407 struct statx bufx; 408 int res = internal_syscall(SYSCALL(statx), AT_FDCWD, (uptr)path, 409 AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT, 410 STATX_BASIC_STATS, (uptr)&bufx); 411 statx_to_stat(&bufx, (struct stat *)buf); 412 return res; 413# elif (defined(_LP64) || SANITIZER_X32 || \ 414 (defined(__mips__) && _MIPS_SIM == _ABIN32)) && \ 415 !SANITIZER_SPARC 416 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf, 417 AT_SYMLINK_NOFOLLOW); 418# else 419 struct stat64 buf64; 420 int res = internal_syscall(SYSCALL(fstatat64), AT_FDCWD, (uptr)path, 421 (uptr)&buf64, AT_SYMLINK_NOFOLLOW); 422 stat64_to_stat(&buf64, (struct stat *)buf); 423 return res; 424# endif 425# else 426 struct stat64 buf64; 427 int res = internal_syscall(SYSCALL(lstat64), path, &buf64); 428 stat64_to_stat(&buf64, (struct stat *)buf); 429 return res; 430# endif 431} 432 433uptr internal_fstat(fd_t fd, void *buf) { 434#if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS 435#if SANITIZER_MIPS64 436 // For mips64, fstat syscall fills buffer in the format of kernel_stat 437 struct kernel_stat kbuf; 438 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf); 439 kernel_stat_to_stat(&kbuf, (struct stat *)buf); 440 return res; 441# elif SANITIZER_LINUX && defined(__loongarch__) 442 struct statx bufx; 443 int res = internal_syscall(SYSCALL(statx), fd, "", AT_EMPTY_PATH, 444 STATX_BASIC_STATS, (uptr)&bufx); 445 statx_to_stat(&bufx, (struct stat *)buf); 446 return res; 447# else 448 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf); 449# endif 450#else 451 struct stat64 buf64; 452 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64); 453 stat64_to_stat(&buf64, (struct stat *)buf); 454 return res; 455#endif 456} 457 458uptr internal_filesize(fd_t fd) { 459 struct stat st; 460 if (internal_fstat(fd, &st)) 461 return -1; 462 return (uptr)st.st_size; 463} 464 465uptr internal_dup(int oldfd) { 466 return internal_syscall(SYSCALL(dup), oldfd); 467} 468 469uptr internal_dup2(int oldfd, int newfd) { 470# if SANITIZER_LINUX 471 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0); 472#else 473 return internal_syscall(SYSCALL(dup2), oldfd, newfd); 474#endif 475} 476 477uptr internal_readlink(const char *path, char *buf, uptr bufsize) { 478# if SANITIZER_LINUX 479 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf, 480 bufsize); 481#else 482 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize); 483#endif 484} 485 486uptr internal_unlink(const char *path) { 487# if SANITIZER_LINUX 488 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0); 489#else 490 return internal_syscall(SYSCALL(unlink), (uptr)path); 491#endif 492} 493 494uptr internal_rename(const char *oldpath, const char *newpath) { 495# if (defined(__riscv) || defined(__loongarch__)) && defined(__linux__) 496 return internal_syscall(SYSCALL(renameat2), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 497 (uptr)newpath, 0); 498# elif SANITIZER_LINUX 499 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD, 500 (uptr)newpath); 501# else 502 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath); 503# endif 504} 505 506uptr internal_sched_yield() { 507 return internal_syscall(SYSCALL(sched_yield)); 508} 509 510void internal_usleep(u64 useconds) { 511 struct timespec ts; 512 ts.tv_sec = useconds / 1000000; 513 ts.tv_nsec = (useconds % 1000000) * 1000; 514 internal_syscall(SYSCALL(nanosleep), &ts, &ts); 515} 516 517uptr internal_execve(const char *filename, char *const argv[], 518 char *const envp[]) { 519 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, 520 (uptr)envp); 521} 522#endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD 523 524#if !SANITIZER_NETBSD 525void internal__exit(int exitcode) { 526#if SANITIZER_FREEBSD || SANITIZER_SOLARIS 527 internal_syscall(SYSCALL(exit), exitcode); 528#else 529 internal_syscall(SYSCALL(exit_group), exitcode); 530#endif 531 Die(); // Unreachable. 532} 533#endif // !SANITIZER_NETBSD 534 535// ----------------- sanitizer_common.h 536bool FileExists(const char *filename) { 537 if (ShouldMockFailureToOpen(filename)) 538 return false; 539 struct stat st; 540 if (internal_stat(filename, &st)) 541 return false; 542 // Sanity check: filename is a regular file. 543 return S_ISREG(st.st_mode); 544} 545 546bool DirExists(const char *path) { 547 struct stat st; 548 if (internal_stat(path, &st)) 549 return false; 550 return S_ISDIR(st.st_mode); 551} 552 553# if !SANITIZER_NETBSD 554tid_t GetTid() { 555#if SANITIZER_FREEBSD 556 long Tid; 557 thr_self(&Tid); 558 return Tid; 559#elif SANITIZER_SOLARIS 560 return thr_self(); 561#else 562 return internal_syscall(SYSCALL(gettid)); 563#endif 564} 565 566int TgKill(pid_t pid, tid_t tid, int sig) { 567#if SANITIZER_LINUX 568 return internal_syscall(SYSCALL(tgkill), pid, tid, sig); 569#elif SANITIZER_FREEBSD 570 return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig); 571#elif SANITIZER_SOLARIS 572 (void)pid; 573 return thr_kill(tid, sig); 574#endif 575} 576#endif 577 578#if SANITIZER_GLIBC 579u64 NanoTime() { 580 kernel_timeval tv; 581 internal_memset(&tv, 0, sizeof(tv)); 582 internal_syscall(SYSCALL(gettimeofday), &tv, 0); 583 return (u64)tv.tv_sec * 1000 * 1000 * 1000 + tv.tv_usec * 1000; 584} 585// Used by real_clock_gettime. 586uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) { 587 return internal_syscall(SYSCALL(clock_gettime), clk_id, tp); 588} 589#elif !SANITIZER_SOLARIS && !SANITIZER_NETBSD 590u64 NanoTime() { 591 struct timespec ts; 592 clock_gettime(CLOCK_REALTIME, &ts); 593 return (u64)ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec; 594} 595#endif 596 597// Like getenv, but reads env directly from /proc (on Linux) or parses the 598// 'environ' array (on some others) and does not use libc. This function 599// should be called first inside __asan_init. 600const char *GetEnv(const char *name) { 601#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_SOLARIS 602 if (::environ != 0) { 603 uptr NameLen = internal_strlen(name); 604 for (char **Env = ::environ; *Env != 0; Env++) { 605 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=') 606 return (*Env) + NameLen + 1; 607 } 608 } 609 return 0; // Not found. 610#elif SANITIZER_LINUX 611 static char *environ; 612 static uptr len; 613 static bool inited; 614 if (!inited) { 615 inited = true; 616 uptr environ_size; 617 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len)) 618 environ = nullptr; 619 } 620 if (!environ || len == 0) return nullptr; 621 uptr namelen = internal_strlen(name); 622 const char *p = environ; 623 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 624 // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 625 const char* endp = 626 (char*)internal_memchr(p, '\0', len - (p - environ)); 627 if (!endp) // this entry isn't NUL terminated 628 return nullptr; 629 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 630 return p + namelen + 1; // point after = 631 p = endp + 1; 632 } 633 return nullptr; // Not found. 634#else 635#error "Unsupported platform" 636#endif 637} 638 639#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_GO 640extern "C" { 641SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; 642} 643#endif 644 645#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 646static void ReadNullSepFileToArray(const char *path, char ***arr, 647 int arr_size) { 648 char *buff; 649 uptr buff_size; 650 uptr buff_len; 651 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 652 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) { 653 (*arr)[0] = nullptr; 654 return; 655 } 656 (*arr)[0] = buff; 657 int count, i; 658 for (count = 1, i = 1; ; i++) { 659 if (buff[i] == 0) { 660 if (buff[i+1] == 0) break; 661 (*arr)[count] = &buff[i+1]; 662 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 663 count++; 664 } 665 } 666 (*arr)[count] = nullptr; 667} 668#endif 669 670static void GetArgsAndEnv(char ***argv, char ***envp) { 671#if SANITIZER_FREEBSD 672 // On FreeBSD, retrieving the argument and environment arrays is done via the 673 // kern.ps_strings sysctl, which returns a pointer to a structure containing 674 // this information. See also <sys/exec.h>. 675 ps_strings *pss; 676 uptr sz = sizeof(pss); 677 if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) { 678 Printf("sysctl kern.ps_strings failed\n"); 679 Die(); 680 } 681 *argv = pss->ps_argvstr; 682 *envp = pss->ps_envstr; 683#elif SANITIZER_NETBSD 684 *argv = __ps_strings->ps_argvstr; 685 *envp = __ps_strings->ps_envstr; 686#else // SANITIZER_FREEBSD 687#if !SANITIZER_GO 688 if (&__libc_stack_end) { 689 uptr* stack_end = (uptr*)__libc_stack_end; 690 // Normally argc can be obtained from *stack_end, however, on ARM glibc's 691 // _start clobbers it: 692 // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/start.S;hb=refs/heads/release/2.31/master#l75 693 // Do not special-case ARM and infer argc from argv everywhere. 694 int argc = 0; 695 while (stack_end[argc + 1]) argc++; 696 *argv = (char**)(stack_end + 1); 697 *envp = (char**)(stack_end + argc + 2); 698 } else { 699#endif // !SANITIZER_GO 700 static const int kMaxArgv = 2000, kMaxEnvp = 2000; 701 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 702 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 703#if !SANITIZER_GO 704 } 705#endif // !SANITIZER_GO 706#endif // SANITIZER_FREEBSD 707} 708 709char **GetArgv() { 710 char **argv, **envp; 711 GetArgsAndEnv(&argv, &envp); 712 return argv; 713} 714 715char **GetEnviron() { 716 char **argv, **envp; 717 GetArgsAndEnv(&argv, &envp); 718 return envp; 719} 720 721#if !SANITIZER_SOLARIS 722void FutexWait(atomic_uint32_t *p, u32 cmp) { 723# if SANITIZER_FREEBSD 724 _umtx_op(p, UMTX_OP_WAIT_UINT, cmp, 0, 0); 725# elif SANITIZER_NETBSD 726 sched_yield(); /* No userspace futex-like synchronization */ 727# else 728 internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAIT_PRIVATE, cmp, 0, 0, 0); 729# endif 730} 731 732void FutexWake(atomic_uint32_t *p, u32 count) { 733# if SANITIZER_FREEBSD 734 _umtx_op(p, UMTX_OP_WAKE, count, 0, 0); 735# elif SANITIZER_NETBSD 736 /* No userspace futex-like synchronization */ 737# else 738 internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAKE_PRIVATE, count, 0, 0, 0); 739# endif 740} 741 742# endif // !SANITIZER_SOLARIS 743 744// ----------------- sanitizer_linux.h 745// The actual size of this structure is specified by d_reclen. 746// Note that getdents64 uses a different structure format. We only provide the 747// 32-bit syscall here. 748#if SANITIZER_NETBSD 749// Not used 750#else 751struct linux_dirent { 752# if SANITIZER_X32 || SANITIZER_LINUX 753 u64 d_ino; 754 u64 d_off; 755# else 756 unsigned long d_ino; 757 unsigned long d_off; 758# endif 759 unsigned short d_reclen; 760# if SANITIZER_LINUX 761 unsigned char d_type; 762# endif 763 char d_name[256]; 764}; 765#endif 766 767#if !SANITIZER_SOLARIS && !SANITIZER_NETBSD 768// Syscall wrappers. 769uptr internal_ptrace(int request, int pid, void *addr, void *data) { 770 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr, 771 (uptr)data); 772} 773 774uptr internal_waitpid(int pid, int *status, int options) { 775 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options, 776 0 /* rusage */); 777} 778 779uptr internal_getpid() { 780 return internal_syscall(SYSCALL(getpid)); 781} 782 783uptr internal_getppid() { 784 return internal_syscall(SYSCALL(getppid)); 785} 786 787int internal_dlinfo(void *handle, int request, void *p) { 788#if SANITIZER_FREEBSD 789 return dlinfo(handle, request, p); 790#else 791 UNIMPLEMENTED(); 792#endif 793} 794 795uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 796#if SANITIZER_FREEBSD 797 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL); 798# elif SANITIZER_LINUX 799 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count); 800# else 801 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count); 802# endif 803} 804 805uptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 806 return internal_syscall(SYSCALL(lseek), fd, offset, whence); 807} 808 809#if SANITIZER_LINUX 810uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 811 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5); 812} 813# if defined(__x86_64__) 814# include <asm/unistd_64.h> 815// Currently internal_arch_prctl() is only needed on x86_64. 816uptr internal_arch_prctl(int option, uptr arg2) { 817 return internal_syscall(__NR_arch_prctl, option, arg2); 818} 819# endif 820# endif 821 822uptr internal_sigaltstack(const void *ss, void *oss) { 823 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss); 824} 825 826int internal_fork() { 827# if SANITIZER_LINUX 828# if SANITIZER_S390 829 return internal_syscall(SYSCALL(clone), 0, SIGCHLD); 830# else 831 return internal_syscall(SYSCALL(clone), SIGCHLD, 0); 832# endif 833# else 834 return internal_syscall(SYSCALL(fork)); 835# endif 836} 837 838#if SANITIZER_FREEBSD 839int internal_sysctl(const int *name, unsigned int namelen, void *oldp, 840 uptr *oldlenp, const void *newp, uptr newlen) { 841 return internal_syscall(SYSCALL(__sysctl), name, namelen, oldp, 842 (size_t *)oldlenp, newp, (size_t)newlen); 843} 844 845int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp, 846 const void *newp, uptr newlen) { 847 // Note: this function can be called during startup, so we need to avoid 848 // calling any interceptable functions. On FreeBSD >= 1300045 sysctlbyname() 849 // is a real syscall, but for older versions it calls sysctlnametomib() 850 // followed by sysctl(). To avoid calling the intercepted version and 851 // asserting if this happens during startup, call the real sysctlnametomib() 852 // followed by internal_sysctl() if the syscall is not available. 853#ifdef SYS___sysctlbyname 854 return internal_syscall(SYSCALL(__sysctlbyname), sname, 855 internal_strlen(sname), oldp, (size_t *)oldlenp, newp, 856 (size_t)newlen); 857#else 858 static decltype(sysctlnametomib) *real_sysctlnametomib = nullptr; 859 if (!real_sysctlnametomib) 860 real_sysctlnametomib = 861 (decltype(sysctlnametomib) *)dlsym(RTLD_NEXT, "sysctlnametomib"); 862 CHECK(real_sysctlnametomib); 863 864 int oid[CTL_MAXNAME]; 865 size_t len = CTL_MAXNAME; 866 if (real_sysctlnametomib(sname, oid, &len) == -1) 867 return (-1); 868 return internal_sysctl(oid, len, oldp, oldlenp, newp, newlen); 869#endif 870} 871#endif 872 873#if SANITIZER_LINUX 874#define SA_RESTORER 0x04000000 875// Doesn't set sa_restorer if the caller did not set it, so use with caution 876//(see below). 877int internal_sigaction_norestorer(int signum, const void *act, void *oldact) { 878 __sanitizer_kernel_sigaction_t k_act, k_oldact; 879 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t)); 880 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t)); 881 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act; 882 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact; 883 if (u_act) { 884 k_act.handler = u_act->handler; 885 k_act.sigaction = u_act->sigaction; 886 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask, 887 sizeof(__sanitizer_kernel_sigset_t)); 888 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL). 889 k_act.sa_flags = u_act->sa_flags | SA_RESTORER; 890 // FIXME: most often sa_restorer is unset, however the kernel requires it 891 // to point to a valid signal restorer that calls the rt_sigreturn syscall. 892 // If sa_restorer passed to the kernel is NULL, the program may crash upon 893 // signal delivery or fail to unwind the stack in the signal handler. 894 // libc implementation of sigaction() passes its own restorer to 895 // rt_sigaction, so we need to do the same (we'll need to reimplement the 896 // restorers; for x86_64 the restorer address can be obtained from 897 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact). 898#if !SANITIZER_ANDROID || !SANITIZER_MIPS32 899 k_act.sa_restorer = u_act->sa_restorer; 900#endif 901 } 902 903 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum, 904 (uptr)(u_act ? &k_act : nullptr), 905 (uptr)(u_oldact ? &k_oldact : nullptr), 906 (uptr)sizeof(__sanitizer_kernel_sigset_t)); 907 908 if ((result == 0) && u_oldact) { 909 u_oldact->handler = k_oldact.handler; 910 u_oldact->sigaction = k_oldact.sigaction; 911 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask, 912 sizeof(__sanitizer_kernel_sigset_t)); 913 u_oldact->sa_flags = k_oldact.sa_flags; 914#if !SANITIZER_ANDROID || !SANITIZER_MIPS32 915 u_oldact->sa_restorer = k_oldact.sa_restorer; 916#endif 917 } 918 return result; 919} 920#endif // SANITIZER_LINUX 921 922uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 923 __sanitizer_sigset_t *oldset) { 924#if SANITIZER_FREEBSD 925 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset); 926#else 927 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 928 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset; 929 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how, (uptr)k_set, 930 (uptr)k_oldset, sizeof(__sanitizer_kernel_sigset_t)); 931#endif 932} 933 934void internal_sigfillset(__sanitizer_sigset_t *set) { 935 internal_memset(set, 0xff, sizeof(*set)); 936} 937 938void internal_sigemptyset(__sanitizer_sigset_t *set) { 939 internal_memset(set, 0, sizeof(*set)); 940} 941 942#if SANITIZER_LINUX 943void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 944 signum -= 1; 945 CHECK_GE(signum, 0); 946 CHECK_LT(signum, sizeof(*set) * 8); 947 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 948 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 949 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 950 k_set->sig[idx] &= ~((uptr)1 << bit); 951} 952 953bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 954 signum -= 1; 955 CHECK_GE(signum, 0); 956 CHECK_LT(signum, sizeof(*set) * 8); 957 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set; 958 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8); 959 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8); 960 return k_set->sig[idx] & ((uptr)1 << bit); 961} 962#elif SANITIZER_FREEBSD 963uptr internal_procctl(int type, int id, int cmd, void *data) { 964 return internal_syscall(SYSCALL(procctl), type, id, cmd, data); 965} 966 967void internal_sigdelset(__sanitizer_sigset_t *set, int signum) { 968 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 969 sigdelset(rset, signum); 970} 971 972bool internal_sigismember(__sanitizer_sigset_t *set, int signum) { 973 sigset_t *rset = reinterpret_cast<sigset_t *>(set); 974 return sigismember(rset, signum); 975} 976#endif 977#endif // !SANITIZER_SOLARIS 978 979#if !SANITIZER_NETBSD 980// ThreadLister implementation. 981ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) { 982 char task_directory_path[80]; 983 internal_snprintf(task_directory_path, sizeof(task_directory_path), 984 "/proc/%d/task/", pid); 985 descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 986 if (internal_iserror(descriptor_)) { 987 Report("Can't open /proc/%d/task for reading.\n", pid); 988 } 989} 990 991ThreadLister::Result ThreadLister::ListThreads( 992 InternalMmapVector<tid_t> *threads) { 993 if (internal_iserror(descriptor_)) 994 return Error; 995 internal_lseek(descriptor_, 0, SEEK_SET); 996 threads->clear(); 997 998 Result result = Ok; 999 for (bool first_read = true;; first_read = false) { 1000 // Resize to max capacity if it was downsized by IsAlive. 1001 buffer_.resize(buffer_.capacity()); 1002 CHECK_GE(buffer_.size(), 4096); 1003 uptr read = internal_getdents( 1004 descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size()); 1005 if (!read) 1006 return result; 1007 if (internal_iserror(read)) { 1008 Report("Can't read directory entries from /proc/%d/task.\n", pid_); 1009 return Error; 1010 } 1011 1012 for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) { 1013 struct linux_dirent *entry = (struct linux_dirent *)begin; 1014 begin += entry->d_reclen; 1015 if (entry->d_ino == 1) { 1016 // Inode 1 is for bad blocks and also can be a reason for early return. 1017 // Should be emitted if kernel tried to output terminating thread. 1018 // See proc_task_readdir implementation in Linux. 1019 result = Incomplete; 1020 } 1021 if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9') 1022 threads->push_back(internal_atoll(entry->d_name)); 1023 } 1024 1025 // Now we are going to detect short-read or early EOF. In such cases Linux 1026 // can return inconsistent list with missing alive threads. 1027 // Code will just remember that the list can be incomplete but it will 1028 // continue reads to return as much as possible. 1029 if (!first_read) { 1030 // The first one was a short-read by definition. 1031 result = Incomplete; 1032 } else if (read > buffer_.size() - 1024) { 1033 // Read was close to the buffer size. So double the size and assume the 1034 // worst. 1035 buffer_.resize(buffer_.size() * 2); 1036 result = Incomplete; 1037 } else if (!threads->empty() && !IsAlive(threads->back())) { 1038 // Maybe Linux early returned from read on terminated thread (!pid_alive) 1039 // and failed to restore read position. 1040 // See next_tid and proc_task_instantiate in Linux. 1041 result = Incomplete; 1042 } 1043 } 1044} 1045 1046bool ThreadLister::IsAlive(int tid) { 1047 // /proc/%d/task/%d/status uses same call to detect alive threads as 1048 // proc_task_readdir. See task_state implementation in Linux. 1049 char path[80]; 1050 internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid); 1051 if (!ReadFileToVector(path, &buffer_) || buffer_.empty()) 1052 return false; 1053 buffer_.push_back(0); 1054 static const char kPrefix[] = "\nPPid:"; 1055 const char *field = internal_strstr(buffer_.data(), kPrefix); 1056 if (!field) 1057 return false; 1058 field += internal_strlen(kPrefix); 1059 return (int)internal_atoll(field) != 0; 1060} 1061 1062ThreadLister::~ThreadLister() { 1063 if (!internal_iserror(descriptor_)) 1064 internal_close(descriptor_); 1065} 1066#endif 1067 1068#if SANITIZER_WORDSIZE == 32 1069// Take care of unusable kernel area in top gigabyte. 1070static uptr GetKernelAreaSize() { 1071#if SANITIZER_LINUX && !SANITIZER_X32 1072 const uptr gbyte = 1UL << 30; 1073 1074 // Firstly check if there are writable segments 1075 // mapped to top gigabyte (e.g. stack). 1076 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 1077 if (proc_maps.Error()) 1078 return 0; 1079 MemoryMappedSegment segment; 1080 while (proc_maps.Next(&segment)) { 1081 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0; 1082 } 1083 1084#if !SANITIZER_ANDROID 1085 // Even if nothing is mapped, top Gb may still be accessible 1086 // if we are running on 64-bit kernel. 1087 // Uname may report misleading results if personality type 1088 // is modified (e.g. under schroot) so check this as well. 1089 struct utsname uname_info; 1090 int pers = personality(0xffffffffUL); 1091 if (!(pers & PER_MASK) && internal_uname(&uname_info) == 0 && 1092 internal_strstr(uname_info.machine, "64")) 1093 return 0; 1094#endif // SANITIZER_ANDROID 1095 1096 // Top gigabyte is reserved for kernel. 1097 return gbyte; 1098#else 1099 return 0; 1100#endif // SANITIZER_LINUX && !SANITIZER_X32 1101} 1102#endif // SANITIZER_WORDSIZE == 32 1103 1104uptr GetMaxVirtualAddress() { 1105#if SANITIZER_NETBSD && defined(__x86_64__) 1106 return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE) 1107#elif SANITIZER_WORDSIZE == 64 1108# if defined(__powerpc64__) || defined(__aarch64__) || defined(__loongarch__) 1109 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 1110 // We somehow need to figure out which one we are using now and choose 1111 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 1112 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 1113 // of the address space, so simply checking the stack address is not enough. 1114 // This should (does) work for both PowerPC64 Endian modes. 1115 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit. 1116 // loongarch64 also has multiple address space layouts: default is 47-bit. 1117 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1; 1118#elif SANITIZER_RISCV64 1119 return (1ULL << 38) - 1; 1120# elif SANITIZER_MIPS64 1121 return (1ULL << 40) - 1; // 0x000000ffffffffffUL; 1122# elif defined(__s390x__) 1123 return (1ULL << 53) - 1; // 0x001fffffffffffffUL; 1124#elif defined(__sparc__) 1125 return ~(uptr)0; 1126# else 1127 return (1ULL << 47) - 1; // 0x00007fffffffffffUL; 1128# endif 1129#else // SANITIZER_WORDSIZE == 32 1130# if defined(__s390__) 1131 return (1ULL << 31) - 1; // 0x7fffffff; 1132# else 1133 return (1ULL << 32) - 1; // 0xffffffff; 1134# endif 1135#endif // SANITIZER_WORDSIZE 1136} 1137 1138uptr GetMaxUserVirtualAddress() { 1139 uptr addr = GetMaxVirtualAddress(); 1140#if SANITIZER_WORDSIZE == 32 && !defined(__s390__) 1141 if (!common_flags()->full_address_space) 1142 addr -= GetKernelAreaSize(); 1143 CHECK_LT(reinterpret_cast<uptr>(&addr), addr); 1144#endif 1145 return addr; 1146} 1147 1148#if !SANITIZER_ANDROID 1149uptr GetPageSize() { 1150#if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) && \ 1151 defined(EXEC_PAGESIZE) 1152 return EXEC_PAGESIZE; 1153#elif SANITIZER_FREEBSD || SANITIZER_NETBSD 1154// Use sysctl as sysconf can trigger interceptors internally. 1155 int pz = 0; 1156 uptr pzl = sizeof(pz); 1157 int mib[2] = {CTL_HW, HW_PAGESIZE}; 1158 int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0); 1159 CHECK_EQ(rv, 0); 1160 return (uptr)pz; 1161#elif SANITIZER_USE_GETAUXVAL 1162 return getauxval(AT_PAGESZ); 1163#else 1164 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 1165#endif 1166} 1167#endif // !SANITIZER_ANDROID 1168 1169uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { 1170#if SANITIZER_SOLARIS 1171 const char *default_module_name = getexecname(); 1172 CHECK_NE(default_module_name, NULL); 1173 return internal_snprintf(buf, buf_len, "%s", default_module_name); 1174#else 1175#if SANITIZER_FREEBSD || SANITIZER_NETBSD 1176#if SANITIZER_FREEBSD 1177 const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; 1178#else 1179 const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; 1180#endif 1181 const char *default_module_name = "kern.proc.pathname"; 1182 uptr Size = buf_len; 1183 bool IsErr = 1184 (internal_sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); 1185 int readlink_error = IsErr ? errno : 0; 1186 uptr module_name_len = Size; 1187#else 1188 const char *default_module_name = "/proc/self/exe"; 1189 uptr module_name_len = internal_readlink( 1190 default_module_name, buf, buf_len); 1191 int readlink_error; 1192 bool IsErr = internal_iserror(module_name_len, &readlink_error); 1193#endif // SANITIZER_SOLARIS 1194 if (IsErr) { 1195 // We can't read binary name for some reason, assume it's unknown. 1196 Report("WARNING: reading executable name failed with errno %d, " 1197 "some stack frames may not be symbolized\n", readlink_error); 1198 module_name_len = internal_snprintf(buf, buf_len, "%s", 1199 default_module_name); 1200 CHECK_LT(module_name_len, buf_len); 1201 } 1202 return module_name_len; 1203#endif 1204} 1205 1206uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { 1207#if SANITIZER_LINUX 1208 char *tmpbuf; 1209 uptr tmpsize; 1210 uptr tmplen; 1211 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, 1212 1024 * 1024)) { 1213 internal_strncpy(buf, tmpbuf, buf_len); 1214 UnmapOrDie(tmpbuf, tmpsize); 1215 return internal_strlen(buf); 1216 } 1217#endif 1218 return ReadBinaryName(buf, buf_len); 1219} 1220 1221// Match full names of the form /path/to/base_name{-,.}* 1222bool LibraryNameIs(const char *full_name, const char *base_name) { 1223 const char *name = full_name; 1224 // Strip path. 1225 while (*name != '\0') name++; 1226 while (name > full_name && *name != '/') name--; 1227 if (*name == '/') name++; 1228 uptr base_name_length = internal_strlen(base_name); 1229 if (internal_strncmp(name, base_name, base_name_length)) return false; 1230 return (name[base_name_length] == '-' || name[base_name_length] == '.'); 1231} 1232 1233#if !SANITIZER_ANDROID 1234// Call cb for each region mapped by map. 1235void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 1236 CHECK_NE(map, nullptr); 1237#if !SANITIZER_FREEBSD 1238 typedef ElfW(Phdr) Elf_Phdr; 1239 typedef ElfW(Ehdr) Elf_Ehdr; 1240#endif // !SANITIZER_FREEBSD 1241 char *base = (char *)map->l_addr; 1242 Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 1243 char *phdrs = base + ehdr->e_phoff; 1244 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 1245 1246 // Find the segment with the minimum base so we can "relocate" the p_vaddr 1247 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 1248 // objects have a non-zero base. 1249 uptr preferred_base = (uptr)-1; 1250 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1251 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1252 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 1253 preferred_base = (uptr)phdr->p_vaddr; 1254 } 1255 1256 // Compute the delta from the real base to get a relocation delta. 1257 sptr delta = (uptr)base - preferred_base; 1258 // Now we can figure out what the loader really mapped. 1259 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 1260 Elf_Phdr *phdr = (Elf_Phdr *)iter; 1261 if (phdr->p_type == PT_LOAD) { 1262 uptr seg_start = phdr->p_vaddr + delta; 1263 uptr seg_end = seg_start + phdr->p_memsz; 1264 // None of these values are aligned. We consider the ragged edges of the 1265 // load command as defined, since they are mapped from the file. 1266 seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 1267 seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 1268 cb((void *)seg_start, seg_end - seg_start); 1269 } 1270 } 1271} 1272#endif 1273 1274#if SANITIZER_LINUX 1275#if defined(__x86_64__) 1276// We cannot use glibc's clone wrapper, because it messes with the child 1277// task's TLS. It writes the PID and TID of the child task to its thread 1278// descriptor, but in our case the child task shares the thread descriptor with 1279// the parent (because we don't know how to allocate a new thread 1280// descriptor to keep glibc happy). So the stock version of clone(), when 1281// used with CLONE_VM, would end up corrupting the parent's thread descriptor. 1282uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1283 int *parent_tidptr, void *newtls, int *child_tidptr) { 1284 long long res; 1285 if (!fn || !child_stack) 1286 return -EINVAL; 1287 CHECK_EQ(0, (uptr)child_stack % 16); 1288 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1289 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1290 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1291 register void *r8 __asm__("r8") = newtls; 1292 register int *r10 __asm__("r10") = child_tidptr; 1293 __asm__ __volatile__( 1294 /* %rax = syscall(%rax = SYSCALL(clone), 1295 * %rdi = flags, 1296 * %rsi = child_stack, 1297 * %rdx = parent_tidptr, 1298 * %r8 = new_tls, 1299 * %r10 = child_tidptr) 1300 */ 1301 "syscall\n" 1302 1303 /* if (%rax != 0) 1304 * return; 1305 */ 1306 "testq %%rax,%%rax\n" 1307 "jnz 1f\n" 1308 1309 /* In the child. Terminate unwind chain. */ 1310 // XXX: We should also terminate the CFI unwind chain 1311 // here. Unfortunately clang 3.2 doesn't support the 1312 // necessary CFI directives, so we skip that part. 1313 "xorq %%rbp,%%rbp\n" 1314 1315 /* Call "fn(arg)". */ 1316 "popq %%rax\n" 1317 "popq %%rdi\n" 1318 "call *%%rax\n" 1319 1320 /* Call _exit(%rax). */ 1321 "movq %%rax,%%rdi\n" 1322 "movq %2,%%rax\n" 1323 "syscall\n" 1324 1325 /* Return to parent. */ 1326 "1:\n" 1327 : "=a" (res) 1328 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1329 "S"(child_stack), 1330 "D"(flags), 1331 "d"(parent_tidptr), 1332 "r"(r8), 1333 "r"(r10) 1334 : "memory", "r11", "rcx"); 1335 return res; 1336} 1337#elif defined(__mips__) 1338uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1339 int *parent_tidptr, void *newtls, int *child_tidptr) { 1340 long long res; 1341 if (!fn || !child_stack) 1342 return -EINVAL; 1343 CHECK_EQ(0, (uptr)child_stack % 16); 1344 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1345 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1346 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1347 register void *a3 __asm__("$7") = newtls; 1348 register int *a4 __asm__("$8") = child_tidptr; 1349 // We don't have proper CFI directives here because it requires alot of code 1350 // for very marginal benefits. 1351 __asm__ __volatile__( 1352 /* $v0 = syscall($v0 = __NR_clone, 1353 * $a0 = flags, 1354 * $a1 = child_stack, 1355 * $a2 = parent_tidptr, 1356 * $a3 = new_tls, 1357 * $a4 = child_tidptr) 1358 */ 1359 ".cprestore 16;\n" 1360 "move $4,%1;\n" 1361 "move $5,%2;\n" 1362 "move $6,%3;\n" 1363 "move $7,%4;\n" 1364 /* Store the fifth argument on stack 1365 * if we are using 32-bit abi. 1366 */ 1367#if SANITIZER_WORDSIZE == 32 1368 "lw %5,16($29);\n" 1369#else 1370 "move $8,%5;\n" 1371#endif 1372 "li $2,%6;\n" 1373 "syscall;\n" 1374 1375 /* if ($v0 != 0) 1376 * return; 1377 */ 1378 "bnez $2,1f;\n" 1379 1380 /* Call "fn(arg)". */ 1381#if SANITIZER_WORDSIZE == 32 1382#ifdef __BIG_ENDIAN__ 1383 "lw $25,4($29);\n" 1384 "lw $4,12($29);\n" 1385#else 1386 "lw $25,0($29);\n" 1387 "lw $4,8($29);\n" 1388#endif 1389#else 1390 "ld $25,0($29);\n" 1391 "ld $4,8($29);\n" 1392#endif 1393 "jal $25;\n" 1394 1395 /* Call _exit($v0). */ 1396 "move $4,$2;\n" 1397 "li $2,%7;\n" 1398 "syscall;\n" 1399 1400 /* Return to parent. */ 1401 "1:\n" 1402 : "=r" (res) 1403 : "r"(flags), 1404 "r"(child_stack), 1405 "r"(parent_tidptr), 1406 "r"(a3), 1407 "r"(a4), 1408 "i"(__NR_clone), 1409 "i"(__NR_exit) 1410 : "memory", "$29" ); 1411 return res; 1412} 1413#elif SANITIZER_RISCV64 1414uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1415 int *parent_tidptr, void *newtls, int *child_tidptr) { 1416 if (!fn || !child_stack) 1417 return -EINVAL; 1418 1419 CHECK_EQ(0, (uptr)child_stack % 16); 1420 1421 register int res __asm__("a0"); 1422 register int __flags __asm__("a0") = flags; 1423 register void *__stack __asm__("a1") = child_stack; 1424 register int *__ptid __asm__("a2") = parent_tidptr; 1425 register void *__tls __asm__("a3") = newtls; 1426 register int *__ctid __asm__("a4") = child_tidptr; 1427 register int (*__fn)(void *) __asm__("a5") = fn; 1428 register void *__arg __asm__("a6") = arg; 1429 register int nr_clone __asm__("a7") = __NR_clone; 1430 1431 __asm__ __volatile__( 1432 "ecall\n" 1433 1434 /* if (a0 != 0) 1435 * return a0; 1436 */ 1437 "bnez a0, 1f\n" 1438 1439 // In the child, now. Call "fn(arg)". 1440 "mv a0, a6\n" 1441 "jalr a5\n" 1442 1443 // Call _exit(a0). 1444 "addi a7, zero, %9\n" 1445 "ecall\n" 1446 "1:\n" 1447 1448 : "=r"(res) 1449 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__tls), "r"(__ctid), 1450 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit) 1451 : "memory"); 1452 return res; 1453} 1454#elif defined(__aarch64__) 1455uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1456 int *parent_tidptr, void *newtls, int *child_tidptr) { 1457 register long long res __asm__("x0"); 1458 if (!fn || !child_stack) 1459 return -EINVAL; 1460 CHECK_EQ(0, (uptr)child_stack % 16); 1461 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); 1462 ((unsigned long long *)child_stack)[0] = (uptr)fn; 1463 ((unsigned long long *)child_stack)[1] = (uptr)arg; 1464 1465 register int (*__fn)(void *) __asm__("x0") = fn; 1466 register void *__stack __asm__("x1") = child_stack; 1467 register int __flags __asm__("x2") = flags; 1468 register void *__arg __asm__("x3") = arg; 1469 register int *__ptid __asm__("x4") = parent_tidptr; 1470 register void *__tls __asm__("x5") = newtls; 1471 register int *__ctid __asm__("x6") = child_tidptr; 1472 1473 __asm__ __volatile__( 1474 "mov x0,x2\n" /* flags */ 1475 "mov x2,x4\n" /* ptid */ 1476 "mov x3,x5\n" /* tls */ 1477 "mov x4,x6\n" /* ctid */ 1478 "mov x8,%9\n" /* clone */ 1479 1480 "svc 0x0\n" 1481 1482 /* if (%r0 != 0) 1483 * return %r0; 1484 */ 1485 "cmp x0, #0\n" 1486 "bne 1f\n" 1487 1488 /* In the child, now. Call "fn(arg)". */ 1489 "ldp x1, x0, [sp], #16\n" 1490 "blr x1\n" 1491 1492 /* Call _exit(%r0). */ 1493 "mov x8, %10\n" 1494 "svc 0x0\n" 1495 "1:\n" 1496 1497 : "=r" (res) 1498 : "i"(-EINVAL), 1499 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), 1500 "r"(__ptid), "r"(__tls), "r"(__ctid), 1501 "i"(__NR_clone), "i"(__NR_exit) 1502 : "x30", "memory"); 1503 return res; 1504} 1505#elif SANITIZER_LOONGARCH64 1506uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1507 int *parent_tidptr, void *newtls, int *child_tidptr) { 1508 if (!fn || !child_stack) 1509 return -EINVAL; 1510 1511 CHECK_EQ(0, (uptr)child_stack % 16); 1512 1513 register int res __asm__("$a0"); 1514 register int __flags __asm__("$a0") = flags; 1515 register void *__stack __asm__("$a1") = child_stack; 1516 register int *__ptid __asm__("$a2") = parent_tidptr; 1517 register int *__ctid __asm__("$a3") = child_tidptr; 1518 register void *__tls __asm__("$a4") = newtls; 1519 register int (*__fn)(void *) __asm__("$a5") = fn; 1520 register void *__arg __asm__("$a6") = arg; 1521 register int nr_clone __asm__("$a7") = __NR_clone; 1522 1523 __asm__ __volatile__( 1524 "syscall 0\n" 1525 1526 // if ($a0 != 0) 1527 // return $a0; 1528 "bnez $a0, 1f\n" 1529 1530 // In the child, now. Call "fn(arg)". 1531 "move $a0, $a6\n" 1532 "jirl $ra, $a5, 0\n" 1533 1534 // Call _exit($a0). 1535 "addi.d $a7, $zero, %9\n" 1536 "syscall 0\n" 1537 1538 "1:\n" 1539 1540 : "=r"(res) 1541 : "0"(__flags), "r"(__stack), "r"(__ptid), "r"(__ctid), "r"(__tls), 1542 "r"(__fn), "r"(__arg), "r"(nr_clone), "i"(__NR_exit) 1543 : "memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8"); 1544 return res; 1545} 1546#elif defined(__powerpc64__) 1547uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1548 int *parent_tidptr, void *newtls, int *child_tidptr) { 1549 long long res; 1550// Stack frame structure. 1551#if SANITIZER_PPC64V1 1552// Back chain == 0 (SP + 112) 1553// Frame (112 bytes): 1554// Parameter save area (SP + 48), 8 doublewords 1555// TOC save area (SP + 40) 1556// Link editor doubleword (SP + 32) 1557// Compiler doubleword (SP + 24) 1558// LR save area (SP + 16) 1559// CR save area (SP + 8) 1560// Back chain (SP + 0) 1561# define FRAME_SIZE 112 1562# define FRAME_TOC_SAVE_OFFSET 40 1563#elif SANITIZER_PPC64V2 1564// Back chain == 0 (SP + 32) 1565// Frame (32 bytes): 1566// TOC save area (SP + 24) 1567// LR save area (SP + 16) 1568// CR save area (SP + 8) 1569// Back chain (SP + 0) 1570# define FRAME_SIZE 32 1571# define FRAME_TOC_SAVE_OFFSET 24 1572#else 1573# error "Unsupported PPC64 ABI" 1574#endif 1575 if (!fn || !child_stack) 1576 return -EINVAL; 1577 CHECK_EQ(0, (uptr)child_stack % 16); 1578 1579 register int (*__fn)(void *) __asm__("r3") = fn; 1580 register void *__cstack __asm__("r4") = child_stack; 1581 register int __flags __asm__("r5") = flags; 1582 register void *__arg __asm__("r6") = arg; 1583 register int *__ptidptr __asm__("r7") = parent_tidptr; 1584 register void *__newtls __asm__("r8") = newtls; 1585 register int *__ctidptr __asm__("r9") = child_tidptr; 1586 1587 __asm__ __volatile__( 1588 /* fn and arg are saved across the syscall */ 1589 "mr 28, %5\n\t" 1590 "mr 27, %8\n\t" 1591 1592 /* syscall 1593 r0 == __NR_clone 1594 r3 == flags 1595 r4 == child_stack 1596 r5 == parent_tidptr 1597 r6 == newtls 1598 r7 == child_tidptr */ 1599 "mr 3, %7\n\t" 1600 "mr 5, %9\n\t" 1601 "mr 6, %10\n\t" 1602 "mr 7, %11\n\t" 1603 "li 0, %3\n\t" 1604 "sc\n\t" 1605 1606 /* Test if syscall was successful */ 1607 "cmpdi cr1, 3, 0\n\t" 1608 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1609 "bne- cr1, 1f\n\t" 1610 1611 /* Set up stack frame */ 1612 "li 29, 0\n\t" 1613 "stdu 29, -8(1)\n\t" 1614 "stdu 1, -%12(1)\n\t" 1615 /* Do the function call */ 1616 "std 2, %13(1)\n\t" 1617#if SANITIZER_PPC64V1 1618 "ld 0, 0(28)\n\t" 1619 "ld 2, 8(28)\n\t" 1620 "mtctr 0\n\t" 1621#elif SANITIZER_PPC64V2 1622 "mr 12, 28\n\t" 1623 "mtctr 12\n\t" 1624#else 1625# error "Unsupported PPC64 ABI" 1626#endif 1627 "mr 3, 27\n\t" 1628 "bctrl\n\t" 1629 "ld 2, %13(1)\n\t" 1630 1631 /* Call _exit(r3) */ 1632 "li 0, %4\n\t" 1633 "sc\n\t" 1634 1635 /* Return to parent */ 1636 "1:\n\t" 1637 "mr %0, 3\n\t" 1638 : "=r" (res) 1639 : "0" (-1), 1640 "i" (EINVAL), 1641 "i" (__NR_clone), 1642 "i" (__NR_exit), 1643 "r" (__fn), 1644 "r" (__cstack), 1645 "r" (__flags), 1646 "r" (__arg), 1647 "r" (__ptidptr), 1648 "r" (__newtls), 1649 "r" (__ctidptr), 1650 "i" (FRAME_SIZE), 1651 "i" (FRAME_TOC_SAVE_OFFSET) 1652 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29"); 1653 return res; 1654} 1655#elif defined(__i386__) 1656uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1657 int *parent_tidptr, void *newtls, int *child_tidptr) { 1658 int res; 1659 if (!fn || !child_stack) 1660 return -EINVAL; 1661 CHECK_EQ(0, (uptr)child_stack % 16); 1662 child_stack = (char *)child_stack - 7 * sizeof(unsigned int); 1663 ((unsigned int *)child_stack)[0] = (uptr)flags; 1664 ((unsigned int *)child_stack)[1] = (uptr)0; 1665 ((unsigned int *)child_stack)[2] = (uptr)fn; 1666 ((unsigned int *)child_stack)[3] = (uptr)arg; 1667 __asm__ __volatile__( 1668 /* %eax = syscall(%eax = SYSCALL(clone), 1669 * %ebx = flags, 1670 * %ecx = child_stack, 1671 * %edx = parent_tidptr, 1672 * %esi = new_tls, 1673 * %edi = child_tidptr) 1674 */ 1675 1676 /* Obtain flags */ 1677 "movl (%%ecx), %%ebx\n" 1678 /* Do the system call */ 1679 "pushl %%ebx\n" 1680 "pushl %%esi\n" 1681 "pushl %%edi\n" 1682 /* Remember the flag value. */ 1683 "movl %%ebx, (%%ecx)\n" 1684 "int $0x80\n" 1685 "popl %%edi\n" 1686 "popl %%esi\n" 1687 "popl %%ebx\n" 1688 1689 /* if (%eax != 0) 1690 * return; 1691 */ 1692 1693 "test %%eax,%%eax\n" 1694 "jnz 1f\n" 1695 1696 /* terminate the stack frame */ 1697 "xorl %%ebp,%%ebp\n" 1698 /* Call FN. */ 1699 "call *%%ebx\n" 1700#ifdef PIC 1701 "call here\n" 1702 "here:\n" 1703 "popl %%ebx\n" 1704 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n" 1705#endif 1706 /* Call exit */ 1707 "movl %%eax, %%ebx\n" 1708 "movl %2, %%eax\n" 1709 "int $0x80\n" 1710 "1:\n" 1711 : "=a" (res) 1712 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), 1713 "c"(child_stack), 1714 "d"(parent_tidptr), 1715 "S"(newtls), 1716 "D"(child_tidptr) 1717 : "memory"); 1718 return res; 1719} 1720#elif defined(__arm__) 1721uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 1722 int *parent_tidptr, void *newtls, int *child_tidptr) { 1723 unsigned int res; 1724 if (!fn || !child_stack) 1725 return -EINVAL; 1726 child_stack = (char *)child_stack - 2 * sizeof(unsigned int); 1727 ((unsigned int *)child_stack)[0] = (uptr)fn; 1728 ((unsigned int *)child_stack)[1] = (uptr)arg; 1729 register int r0 __asm__("r0") = flags; 1730 register void *r1 __asm__("r1") = child_stack; 1731 register int *r2 __asm__("r2") = parent_tidptr; 1732 register void *r3 __asm__("r3") = newtls; 1733 register int *r4 __asm__("r4") = child_tidptr; 1734 register int r7 __asm__("r7") = __NR_clone; 1735 1736#if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) 1737# define ARCH_HAS_BX 1738#endif 1739#if __ARM_ARCH > 4 1740# define ARCH_HAS_BLX 1741#endif 1742 1743#ifdef ARCH_HAS_BX 1744# ifdef ARCH_HAS_BLX 1745# define BLX(R) "blx " #R "\n" 1746# else 1747# define BLX(R) "mov lr, pc; bx " #R "\n" 1748# endif 1749#else 1750# define BLX(R) "mov lr, pc; mov pc," #R "\n" 1751#endif 1752 1753 __asm__ __volatile__( 1754 /* %r0 = syscall(%r7 = SYSCALL(clone), 1755 * %r0 = flags, 1756 * %r1 = child_stack, 1757 * %r2 = parent_tidptr, 1758 * %r3 = new_tls, 1759 * %r4 = child_tidptr) 1760 */ 1761 1762 /* Do the system call */ 1763 "swi 0x0\n" 1764 1765 /* if (%r0 != 0) 1766 * return %r0; 1767 */ 1768 "cmp r0, #0\n" 1769 "bne 1f\n" 1770 1771 /* In the child, now. Call "fn(arg)". */ 1772 "ldr r0, [sp, #4]\n" 1773 "ldr ip, [sp], #8\n" 1774 BLX(ip) 1775 /* Call _exit(%r0). */ 1776 "mov r7, %7\n" 1777 "swi 0x0\n" 1778 "1:\n" 1779 "mov %0, r0\n" 1780 : "=r"(res) 1781 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7), 1782 "i"(__NR_exit) 1783 : "memory"); 1784 return res; 1785} 1786#endif 1787#endif // SANITIZER_LINUX 1788 1789#if SANITIZER_LINUX 1790int internal_uname(struct utsname *buf) { 1791 return internal_syscall(SYSCALL(uname), buf); 1792} 1793#endif 1794 1795#if SANITIZER_ANDROID 1796#if __ANDROID_API__ < 21 1797extern "C" __attribute__((weak)) int dl_iterate_phdr( 1798 int (*)(struct dl_phdr_info *, size_t, void *), void *); 1799#endif 1800 1801static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, 1802 void *data) { 1803 // Any name starting with "lib" indicates a bug in L where library base names 1804 // are returned instead of paths. 1805 if (info->dlpi_name && info->dlpi_name[0] == 'l' && 1806 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { 1807 *(bool *)data = true; 1808 return 1; 1809 } 1810 return 0; 1811} 1812 1813static atomic_uint32_t android_api_level; 1814 1815static AndroidApiLevel AndroidDetectApiLevelStatic() { 1816#if __ANDROID_API__ <= 19 1817 return ANDROID_KITKAT; 1818#elif __ANDROID_API__ <= 22 1819 return ANDROID_LOLLIPOP_MR1; 1820#else 1821 return ANDROID_POST_LOLLIPOP; 1822#endif 1823} 1824 1825static AndroidApiLevel AndroidDetectApiLevel() { 1826 if (!&dl_iterate_phdr) 1827 return ANDROID_KITKAT; // K or lower 1828 bool base_name_seen = false; 1829 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); 1830 if (base_name_seen) 1831 return ANDROID_LOLLIPOP_MR1; // L MR1 1832 return ANDROID_POST_LOLLIPOP; // post-L 1833 // Plain L (API level 21) is completely broken wrt ASan and not very 1834 // interesting to detect. 1835} 1836 1837extern "C" __attribute__((weak)) void* _DYNAMIC; 1838 1839AndroidApiLevel AndroidGetApiLevel() { 1840 AndroidApiLevel level = 1841 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); 1842 if (level) return level; 1843 level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic() 1844 : AndroidDetectApiLevel(); 1845 atomic_store(&android_api_level, level, memory_order_relaxed); 1846 return level; 1847} 1848 1849#endif 1850 1851static HandleSignalMode GetHandleSignalModeImpl(int signum) { 1852 switch (signum) { 1853 case SIGABRT: 1854 return common_flags()->handle_abort; 1855 case SIGILL: 1856 return common_flags()->handle_sigill; 1857 case SIGTRAP: 1858 return common_flags()->handle_sigtrap; 1859 case SIGFPE: 1860 return common_flags()->handle_sigfpe; 1861 case SIGSEGV: 1862 return common_flags()->handle_segv; 1863 case SIGBUS: 1864 return common_flags()->handle_sigbus; 1865 } 1866 return kHandleSignalNo; 1867} 1868 1869HandleSignalMode GetHandleSignalMode(int signum) { 1870 HandleSignalMode result = GetHandleSignalModeImpl(signum); 1871 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler) 1872 return kHandleSignalExclusive; 1873 return result; 1874} 1875 1876#if !SANITIZER_GO 1877void *internal_start_thread(void *(*func)(void *arg), void *arg) { 1878 if (&real_pthread_create == 0) 1879 return nullptr; 1880 // Start the thread with signals blocked, otherwise it can steal user signals. 1881 ScopedBlockSignals block(nullptr); 1882 void *th; 1883 real_pthread_create(&th, nullptr, func, arg); 1884 return th; 1885} 1886 1887void internal_join_thread(void *th) { 1888 if (&real_pthread_join) 1889 real_pthread_join(th, nullptr); 1890} 1891#else 1892void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; } 1893 1894void internal_join_thread(void *th) {} 1895#endif 1896 1897#if SANITIZER_LINUX && defined(__aarch64__) 1898// Android headers in the older NDK releases miss this definition. 1899struct __sanitizer_esr_context { 1900 struct _aarch64_ctx head; 1901 uint64_t esr; 1902}; 1903 1904static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1905 static const u32 kEsrMagic = 0x45535201; 1906 u8 *aux = reinterpret_cast<u8 *>(ucontext->uc_mcontext.__reserved); 1907 while (true) { 1908 _aarch64_ctx *ctx = (_aarch64_ctx *)aux; 1909 if (ctx->size == 0) break; 1910 if (ctx->magic == kEsrMagic) { 1911 *esr = ((__sanitizer_esr_context *)ctx)->esr; 1912 return true; 1913 } 1914 aux += ctx->size; 1915 } 1916 return false; 1917} 1918#elif SANITIZER_FREEBSD && defined(__aarch64__) 1919// FreeBSD doesn't provide ESR in the ucontext. 1920static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) { 1921 return false; 1922} 1923#endif 1924 1925using Context = ucontext_t; 1926 1927SignalContext::WriteFlag SignalContext::GetWriteFlag() const { 1928 Context *ucontext = (Context *)context; 1929#if defined(__x86_64__) || defined(__i386__) 1930 static const uptr PF_WRITE = 1U << 1; 1931#if SANITIZER_FREEBSD 1932 uptr err = ucontext->uc_mcontext.mc_err; 1933#elif SANITIZER_NETBSD 1934 uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR]; 1935#elif SANITIZER_SOLARIS && defined(__i386__) 1936 const int Err = 13; 1937 uptr err = ucontext->uc_mcontext.gregs[Err]; 1938#else 1939 uptr err = ucontext->uc_mcontext.gregs[REG_ERR]; 1940#endif // SANITIZER_FREEBSD 1941 return err & PF_WRITE ? Write : Read; 1942#elif defined(__mips__) 1943 uint32_t *exception_source; 1944 uint32_t faulty_instruction; 1945 uint32_t op_code; 1946 1947 exception_source = (uint32_t *)ucontext->uc_mcontext.pc; 1948 faulty_instruction = (uint32_t)(*exception_source); 1949 1950 op_code = (faulty_instruction >> 26) & 0x3f; 1951 1952 // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions. 1953 switch (op_code) { 1954 case 0x28: // sb 1955 case 0x29: // sh 1956 case 0x2b: // sw 1957 case 0x3f: // sd 1958#if __mips_isa_rev < 6 1959 case 0x2c: // sdl 1960 case 0x2d: // sdr 1961 case 0x2a: // swl 1962 case 0x2e: // swr 1963#endif 1964 return SignalContext::Write; 1965 1966 case 0x20: // lb 1967 case 0x24: // lbu 1968 case 0x21: // lh 1969 case 0x25: // lhu 1970 case 0x23: // lw 1971 case 0x27: // lwu 1972 case 0x37: // ld 1973#if __mips_isa_rev < 6 1974 case 0x1a: // ldl 1975 case 0x1b: // ldr 1976 case 0x22: // lwl 1977 case 0x26: // lwr 1978#endif 1979 return SignalContext::Read; 1980#if __mips_isa_rev == 6 1981 case 0x3b: // pcrel 1982 op_code = (faulty_instruction >> 19) & 0x3; 1983 switch (op_code) { 1984 case 0x1: // lwpc 1985 case 0x2: // lwupc 1986 return SignalContext::Read; 1987 } 1988#endif 1989 } 1990 return SignalContext::Unknown; 1991#elif defined(__arm__) 1992 static const uptr FSR_WRITE = 1U << 11; 1993 uptr fsr = ucontext->uc_mcontext.error_code; 1994 return fsr & FSR_WRITE ? Write : Read; 1995#elif defined(__aarch64__) 1996 static const u64 ESR_ELx_WNR = 1U << 6; 1997 u64 esr; 1998 if (!Aarch64GetESR(ucontext, &esr)) return Unknown; 1999 return esr & ESR_ELx_WNR ? Write : Read; 2000#elif defined(__loongarch__) 2001 u32 flags = ucontext->uc_mcontext.__flags; 2002 if (flags & SC_ADDRERR_RD) 2003 return SignalContext::Read; 2004 if (flags & SC_ADDRERR_WR) 2005 return SignalContext::Write; 2006 return SignalContext::Unknown; 2007#elif defined(__sparc__) 2008 // Decode the instruction to determine the access type. 2009 // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype). 2010#if SANITIZER_SOLARIS 2011 uptr pc = ucontext->uc_mcontext.gregs[REG_PC]; 2012#else 2013 // Historical BSDism here. 2014 struct sigcontext *scontext = (struct sigcontext *)context; 2015#if defined(__arch64__) 2016 uptr pc = scontext->sigc_regs.tpc; 2017#else 2018 uptr pc = scontext->si_regs.pc; 2019#endif 2020#endif 2021 u32 instr = *(u32 *)pc; 2022 return (instr >> 21) & 1 ? Write: Read; 2023#elif defined(__riscv) 2024#if SANITIZER_FREEBSD 2025 unsigned long pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc; 2026#else 2027 unsigned long pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2028#endif 2029 unsigned faulty_instruction = *(uint16_t *)pc; 2030 2031#if defined(__riscv_compressed) 2032 if ((faulty_instruction & 0x3) != 0x3) { // it's a compressed instruction 2033 // set op_bits to the instruction bits [1, 0, 15, 14, 13] 2034 unsigned op_bits = 2035 ((faulty_instruction & 0x3) << 3) | (faulty_instruction >> 13); 2036 unsigned rd = faulty_instruction & 0xF80; // bits 7-11, inclusive 2037 switch (op_bits) { 2038 case 0b10'010: // c.lwsp (rd != x0) 2039#if __riscv_xlen == 64 2040 case 0b10'011: // c.ldsp (rd != x0) 2041#endif 2042 return rd ? SignalContext::Read : SignalContext::Unknown; 2043 case 0b00'010: // c.lw 2044#if __riscv_flen >= 32 && __riscv_xlen == 32 2045 case 0b10'011: // c.flwsp 2046#endif 2047#if __riscv_flen >= 32 || __riscv_xlen == 64 2048 case 0b00'011: // c.flw / c.ld 2049#endif 2050#if __riscv_flen == 64 2051 case 0b00'001: // c.fld 2052 case 0b10'001: // c.fldsp 2053#endif 2054 return SignalContext::Read; 2055 case 0b00'110: // c.sw 2056 case 0b10'110: // c.swsp 2057#if __riscv_flen >= 32 || __riscv_xlen == 64 2058 case 0b00'111: // c.fsw / c.sd 2059 case 0b10'111: // c.fswsp / c.sdsp 2060#endif 2061#if __riscv_flen == 64 2062 case 0b00'101: // c.fsd 2063 case 0b10'101: // c.fsdsp 2064#endif 2065 return SignalContext::Write; 2066 default: 2067 return SignalContext::Unknown; 2068 } 2069 } 2070#endif 2071 2072 unsigned opcode = faulty_instruction & 0x7f; // lower 7 bits 2073 unsigned funct3 = (faulty_instruction >> 12) & 0x7; // bits 12-14, inclusive 2074 switch (opcode) { 2075 case 0b0000011: // loads 2076 switch (funct3) { 2077 case 0b000: // lb 2078 case 0b001: // lh 2079 case 0b010: // lw 2080#if __riscv_xlen == 64 2081 case 0b011: // ld 2082#endif 2083 case 0b100: // lbu 2084 case 0b101: // lhu 2085 return SignalContext::Read; 2086 default: 2087 return SignalContext::Unknown; 2088 } 2089 case 0b0100011: // stores 2090 switch (funct3) { 2091 case 0b000: // sb 2092 case 0b001: // sh 2093 case 0b010: // sw 2094#if __riscv_xlen == 64 2095 case 0b011: // sd 2096#endif 2097 return SignalContext::Write; 2098 default: 2099 return SignalContext::Unknown; 2100 } 2101#if __riscv_flen >= 32 2102 case 0b0000111: // floating-point loads 2103 switch (funct3) { 2104 case 0b010: // flw 2105#if __riscv_flen == 64 2106 case 0b011: // fld 2107#endif 2108 return SignalContext::Read; 2109 default: 2110 return SignalContext::Unknown; 2111 } 2112 case 0b0100111: // floating-point stores 2113 switch (funct3) { 2114 case 0b010: // fsw 2115#if __riscv_flen == 64 2116 case 0b011: // fsd 2117#endif 2118 return SignalContext::Write; 2119 default: 2120 return SignalContext::Unknown; 2121 } 2122#endif 2123 default: 2124 return SignalContext::Unknown; 2125 } 2126#else 2127 (void)ucontext; 2128 return Unknown; // FIXME: Implement. 2129#endif 2130} 2131 2132bool SignalContext::IsTrueFaultingAddress() const { 2133 auto si = static_cast<const siginfo_t *>(siginfo); 2134 // SIGSEGV signals without a true fault address have si_code set to 128. 2135 return si->si_signo == SIGSEGV && si->si_code != 128; 2136} 2137 2138void SignalContext::DumpAllRegisters(void *context) { 2139 // FIXME: Implement this. 2140} 2141 2142static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 2143#if SANITIZER_NETBSD 2144 // This covers all NetBSD architectures 2145 ucontext_t *ucontext = (ucontext_t *)context; 2146 *pc = _UC_MACHINE_PC(ucontext); 2147 *bp = _UC_MACHINE_FP(ucontext); 2148 *sp = _UC_MACHINE_SP(ucontext); 2149#elif defined(__arm__) 2150 ucontext_t *ucontext = (ucontext_t*)context; 2151 *pc = ucontext->uc_mcontext.arm_pc; 2152 *bp = ucontext->uc_mcontext.arm_fp; 2153 *sp = ucontext->uc_mcontext.arm_sp; 2154#elif defined(__aarch64__) 2155# if SANITIZER_FREEBSD 2156 ucontext_t *ucontext = (ucontext_t*)context; 2157 *pc = ucontext->uc_mcontext.mc_gpregs.gp_elr; 2158 *bp = ucontext->uc_mcontext.mc_gpregs.gp_x[29]; 2159 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp; 2160# else 2161 ucontext_t *ucontext = (ucontext_t*)context; 2162 *pc = ucontext->uc_mcontext.pc; 2163 *bp = ucontext->uc_mcontext.regs[29]; 2164 *sp = ucontext->uc_mcontext.sp; 2165# endif 2166#elif defined(__hppa__) 2167 ucontext_t *ucontext = (ucontext_t*)context; 2168 *pc = ucontext->uc_mcontext.sc_iaoq[0]; 2169 /* GCC uses %r3 whenever a frame pointer is needed. */ 2170 *bp = ucontext->uc_mcontext.sc_gr[3]; 2171 *sp = ucontext->uc_mcontext.sc_gr[30]; 2172#elif defined(__x86_64__) 2173# if SANITIZER_FREEBSD 2174 ucontext_t *ucontext = (ucontext_t*)context; 2175 *pc = ucontext->uc_mcontext.mc_rip; 2176 *bp = ucontext->uc_mcontext.mc_rbp; 2177 *sp = ucontext->uc_mcontext.mc_rsp; 2178# else 2179 ucontext_t *ucontext = (ucontext_t*)context; 2180 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 2181 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 2182 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 2183# endif 2184#elif defined(__i386__) 2185# if SANITIZER_FREEBSD 2186 ucontext_t *ucontext = (ucontext_t*)context; 2187 *pc = ucontext->uc_mcontext.mc_eip; 2188 *bp = ucontext->uc_mcontext.mc_ebp; 2189 *sp = ucontext->uc_mcontext.mc_esp; 2190# else 2191 ucontext_t *ucontext = (ucontext_t*)context; 2192# if SANITIZER_SOLARIS 2193 /* Use the numeric values: the symbolic ones are undefined by llvm 2194 include/llvm/Support/Solaris.h. */ 2195# ifndef REG_EIP 2196# define REG_EIP 14 // REG_PC 2197# endif 2198# ifndef REG_EBP 2199# define REG_EBP 6 // REG_FP 2200# endif 2201# ifndef REG_UESP 2202# define REG_UESP 17 // REG_SP 2203# endif 2204# endif 2205 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 2206 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 2207 *sp = ucontext->uc_mcontext.gregs[REG_UESP]; 2208# endif 2209#elif defined(__powerpc__) || defined(__powerpc64__) 2210# if SANITIZER_FREEBSD 2211 ucontext_t *ucontext = (ucontext_t *)context; 2212 *pc = ucontext->uc_mcontext.mc_srr0; 2213 *sp = ucontext->uc_mcontext.mc_frame[1]; 2214 *bp = ucontext->uc_mcontext.mc_frame[31]; 2215# else 2216 ucontext_t *ucontext = (ucontext_t*)context; 2217 *pc = ucontext->uc_mcontext.regs->nip; 2218 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 2219 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 2220 // pointer, but GCC always uses r31 when we need a frame pointer. 2221 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 2222# endif 2223#elif defined(__sparc__) 2224#if defined(__arch64__) || defined(__sparcv9) 2225#define STACK_BIAS 2047 2226#else 2227#define STACK_BIAS 0 2228# endif 2229# if SANITIZER_SOLARIS 2230 ucontext_t *ucontext = (ucontext_t *)context; 2231 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 2232 *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS; 2233#else 2234 // Historical BSDism here. 2235 struct sigcontext *scontext = (struct sigcontext *)context; 2236#if defined(__arch64__) 2237 *pc = scontext->sigc_regs.tpc; 2238 *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS; 2239#else 2240 *pc = scontext->si_regs.pc; 2241 *sp = scontext->si_regs.u_regs[14]; 2242#endif 2243# endif 2244 *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS; 2245#elif defined(__mips__) 2246 ucontext_t *ucontext = (ucontext_t*)context; 2247 *pc = ucontext->uc_mcontext.pc; 2248 *bp = ucontext->uc_mcontext.gregs[30]; 2249 *sp = ucontext->uc_mcontext.gregs[29]; 2250#elif defined(__s390__) 2251 ucontext_t *ucontext = (ucontext_t*)context; 2252# if defined(__s390x__) 2253 *pc = ucontext->uc_mcontext.psw.addr; 2254# else 2255 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff; 2256# endif 2257 *bp = ucontext->uc_mcontext.gregs[11]; 2258 *sp = ucontext->uc_mcontext.gregs[15]; 2259#elif defined(__riscv) 2260 ucontext_t *ucontext = (ucontext_t*)context; 2261# if SANITIZER_FREEBSD 2262 *pc = ucontext->uc_mcontext.mc_gpregs.gp_sepc; 2263 *bp = ucontext->uc_mcontext.mc_gpregs.gp_s[0]; 2264 *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp; 2265# else 2266 *pc = ucontext->uc_mcontext.__gregs[REG_PC]; 2267 *bp = ucontext->uc_mcontext.__gregs[REG_S0]; 2268 *sp = ucontext->uc_mcontext.__gregs[REG_SP]; 2269# endif 2270# elif defined(__hexagon__) 2271 ucontext_t *ucontext = (ucontext_t *)context; 2272 *pc = ucontext->uc_mcontext.pc; 2273 *bp = ucontext->uc_mcontext.r30; 2274 *sp = ucontext->uc_mcontext.r29; 2275# elif defined(__loongarch__) 2276 ucontext_t *ucontext = (ucontext_t *)context; 2277 *pc = ucontext->uc_mcontext.__pc; 2278 *bp = ucontext->uc_mcontext.__gregs[22]; 2279 *sp = ucontext->uc_mcontext.__gregs[3]; 2280# else 2281# error "Unsupported arch" 2282# endif 2283} 2284 2285void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); } 2286 2287void InitializePlatformEarly() { 2288 // Do nothing. 2289} 2290 2291void CheckASLR() { 2292#if SANITIZER_NETBSD 2293 int mib[3]; 2294 int paxflags; 2295 uptr len = sizeof(paxflags); 2296 2297 mib[0] = CTL_PROC; 2298 mib[1] = internal_getpid(); 2299 mib[2] = PROC_PID_PAXFLAGS; 2300 2301 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2302 Printf("sysctl failed\n"); 2303 Die(); 2304 } 2305 2306 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) { 2307 Printf("This sanitizer is not compatible with enabled ASLR.\n" 2308 "To disable ASLR, please run \"paxctl +a %s\" and try again.\n", 2309 GetArgv()[0]); 2310 Die(); 2311 } 2312#elif SANITIZER_FREEBSD 2313 int aslr_status; 2314 int r = internal_procctl(P_PID, 0, PROC_ASLR_STATUS, &aslr_status); 2315 if (UNLIKELY(r == -1)) { 2316 // We're making things less 'dramatic' here since 2317 // the cmd is not necessarily guaranteed to be here 2318 // just yet regarding FreeBSD release 2319 return; 2320 } 2321 if ((aslr_status & PROC_ASLR_ACTIVE) != 0) { 2322 Printf("This sanitizer is not compatible with enabled ASLR " 2323 "and binaries compiled with PIE\n"); 2324 Die(); 2325 } 2326# elif SANITIZER_PPC64V2 2327 // Disable ASLR for Linux PPC64LE. 2328 int old_personality = personality(0xffffffff); 2329 if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) { 2330 VReport(1, 2331 "WARNING: Program is being run with address space layout " 2332 "randomization (ASLR) enabled which prevents the thread and " 2333 "memory sanitizers from working on powerpc64le.\n" 2334 "ASLR will be disabled and the program re-executed.\n"); 2335 CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1); 2336 ReExec(); 2337 } 2338# else 2339 // Do nothing 2340# endif 2341} 2342 2343void CheckMPROTECT() { 2344#if SANITIZER_NETBSD 2345 int mib[3]; 2346 int paxflags; 2347 uptr len = sizeof(paxflags); 2348 2349 mib[0] = CTL_PROC; 2350 mib[1] = internal_getpid(); 2351 mib[2] = PROC_PID_PAXFLAGS; 2352 2353 if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) { 2354 Printf("sysctl failed\n"); 2355 Die(); 2356 } 2357 2358 if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) { 2359 Printf("This sanitizer is not compatible with enabled MPROTECT\n"); 2360 Die(); 2361 } 2362#else 2363 // Do nothing 2364#endif 2365} 2366 2367void CheckNoDeepBind(const char *filename, int flag) { 2368#ifdef RTLD_DEEPBIND 2369 if (flag & RTLD_DEEPBIND) { 2370 Report( 2371 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag" 2372 " which is incompatible with sanitizer runtime " 2373 "(see https://github.com/google/sanitizers/issues/611 for details" 2374 "). If you want to run %s library under sanitizers please remove " 2375 "RTLD_DEEPBIND from dlopen flags.\n", 2376 filename, filename); 2377 Die(); 2378 } 2379#endif 2380} 2381 2382uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding, 2383 uptr *largest_gap_found, 2384 uptr *max_occupied_addr) { 2385 UNREACHABLE("FindAvailableMemoryRange is not available"); 2386 return 0; 2387} 2388 2389bool GetRandom(void *buffer, uptr length, bool blocking) { 2390 if (!buffer || !length || length > 256) 2391 return false; 2392#if SANITIZER_USE_GETENTROPY 2393 uptr rnd = getentropy(buffer, length); 2394 int rverrno = 0; 2395 if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT) 2396 return false; 2397 else if (rnd == 0) 2398 return true; 2399#endif // SANITIZER_USE_GETENTROPY 2400 2401#if SANITIZER_USE_GETRANDOM 2402 static atomic_uint8_t skip_getrandom_syscall; 2403 if (!atomic_load_relaxed(&skip_getrandom_syscall)) { 2404 // Up to 256 bytes, getrandom will not be interrupted. 2405 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 2406 blocking ? 0 : GRND_NONBLOCK); 2407 int rverrno = 0; 2408 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS) 2409 atomic_store_relaxed(&skip_getrandom_syscall, 1); 2410 else if (res == length) 2411 return true; 2412 } 2413#endif // SANITIZER_USE_GETRANDOM 2414 // Up to 256 bytes, a read off /dev/urandom will not be interrupted. 2415 // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom. 2416 uptr fd = internal_open("/dev/urandom", O_RDONLY); 2417 if (internal_iserror(fd)) 2418 return false; 2419 uptr res = internal_read(fd, buffer, length); 2420 if (internal_iserror(res)) 2421 return false; 2422 internal_close(fd); 2423 return true; 2424} 2425 2426} // namespace __sanitizer 2427 2428#endif 2429