1 //===-- sanitizer_mac.cc --------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is shared between various sanitizers' runtime libraries and
11 // implements OSX-specific functions.
12 //===----------------------------------------------------------------------===//
14 #include "sanitizer_platform.h"
16 #include "sanitizer_mac.h"
18 // Use 64-bit inodes in file operations. ASan does not support OS X 10.5, so
19 // the clients will most certainly use 64-bit ones as well.
20 #ifndef _DARWIN_USE_64_BIT_INODE
21 #define _DARWIN_USE_64_BIT_INODE 1
25 #include "sanitizer_common.h"
26 #include "sanitizer_file.h"
27 #include "sanitizer_flags.h"
28 #include "sanitizer_internal_defs.h"
29 #include "sanitizer_libc.h"
30 #include "sanitizer_placement_new.h"
31 #include "sanitizer_platform_limits_posix.h"
32 #include "sanitizer_procmaps.h"
35 #include <crt_externs.h> // for _NSGetEnviron
37 extern char **environ;
40 #if defined(__has_include) && __has_include(<os/trace.h>)
41 #define SANITIZER_OS_TRACE 1
44 #define SANITIZER_OS_TRACE 0
48 #include <crt_externs.h> // for _NSGetArgv and _NSGetEnviron
51 extern char ***_NSGetArgv(void);
56 #include <dlfcn.h> // for dladdr()
59 #include <libkern/OSAtomic.h>
60 #include <mach-o/dyld.h>
61 #include <mach/mach.h>
62 #include <mach/mach_time.h>
63 #include <mach/vm_statistics.h>
64 #include <malloc/malloc.h>
70 #include <sys/resource.h>
72 #include <sys/sysctl.h>
73 #include <sys/types.h>
78 // From <crt_externs.h>, but we don't have that file on iOS.
80 extern char ***_NSGetArgv(void);
81 extern char ***_NSGetEnviron(void);
84 // From <mach/mach_vm.h>, but we don't have that file on iOS.
86 extern kern_return_t mach_vm_region_recurse(
88 mach_vm_address_t *address,
90 natural_t *nesting_depth,
91 vm_region_recurse_info_t info,
92 mach_msg_type_number_t *infoCnt);
95 namespace __sanitizer {
97 #include "sanitizer_syscall_generic.inc"
99 // Direct syscalls, don't call libmalloc hooks (but not available on 10.6).
100 extern "C" void *__mmap(void *addr, size_t len, int prot, int flags, int fildes,
101 off_t off) SANITIZER_WEAK_ATTRIBUTE;
102 extern "C" int __munmap(void *, size_t) SANITIZER_WEAK_ATTRIBUTE;
104 // ---------------------- sanitizer_libc.h
106 // From <mach/vm_statistics.h>, but not on older OSs.
107 #ifndef VM_MEMORY_SANITIZER
108 #define VM_MEMORY_SANITIZER 99
111 uptr internal_mmap(void *addr, size_t length, int prot, int flags,
112 int fd, u64 offset) {
113 if (fd == -1) fd = VM_MAKE_TAG(VM_MEMORY_SANITIZER);
114 if (&__mmap) return (uptr)__mmap(addr, length, prot, flags, fd, offset);
115 return (uptr)mmap(addr, length, prot, flags, fd, offset);
118 uptr internal_munmap(void *addr, uptr length) {
119 if (&__munmap) return __munmap(addr, length);
120 return munmap(addr, length);
123 int internal_mprotect(void *addr, uptr length, int prot) {
124 return mprotect(addr, length, prot);
127 uptr internal_close(fd_t fd) {
131 uptr internal_open(const char *filename, int flags) {
132 return open(filename, flags);
135 uptr internal_open(const char *filename, int flags, u32 mode) {
136 return open(filename, flags, mode);
139 uptr internal_read(fd_t fd, void *buf, uptr count) {
140 return read(fd, buf, count);
143 uptr internal_write(fd_t fd, const void *buf, uptr count) {
144 return write(fd, buf, count);
147 uptr internal_stat(const char *path, void *buf) {
148 return stat(path, (struct stat *)buf);
151 uptr internal_lstat(const char *path, void *buf) {
152 return lstat(path, (struct stat *)buf);
155 uptr internal_fstat(fd_t fd, void *buf) {
156 return fstat(fd, (struct stat *)buf);
159 uptr internal_filesize(fd_t fd) {
161 if (internal_fstat(fd, &st))
163 return (uptr)st.st_size;
166 uptr internal_dup2(int oldfd, int newfd) {
167 return dup2(oldfd, newfd);
170 uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
171 return readlink(path, buf, bufsize);
174 uptr internal_unlink(const char *path) {
178 uptr internal_sched_yield() {
179 return sched_yield();
182 void internal__exit(int exitcode) {
186 unsigned int internal_sleep(unsigned int seconds) {
187 return sleep(seconds);
190 uptr internal_getpid() {
194 int internal_sigaction(int signum, const void *act, void *oldact) {
195 return sigaction(signum,
196 (const struct sigaction *)act, (struct sigaction *)oldact);
199 void internal_sigfillset(__sanitizer_sigset_t *set) { sigfillset(set); }
201 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
202 __sanitizer_sigset_t *oldset) {
203 // Don't use sigprocmask here, because it affects all threads.
204 return pthread_sigmask(how, set, oldset);
207 // Doesn't call pthread_atfork() handlers (but not available on 10.6).
208 extern "C" pid_t __fork(void) SANITIZER_WEAK_ATTRIBUTE;
210 int internal_fork() {
216 int internal_forkpty(int *amaster) {
218 if (openpty(&master, &slave, nullptr, nullptr, nullptr) == -1) return -1;
219 int pid = internal_fork();
227 if (login_tty(slave) != 0) {
228 // We already forked, there's not much we can do. Let's quit.
229 Report("login_tty failed (errno %d)\n", errno);
239 uptr internal_rename(const char *oldpath, const char *newpath) {
240 return rename(oldpath, newpath);
243 uptr internal_ftruncate(fd_t fd, uptr size) {
244 return ftruncate(fd, size);
247 uptr internal_execve(const char *filename, char *const argv[],
248 char *const envp[]) {
249 return execve(filename, argv, envp);
252 uptr internal_waitpid(int pid, int *status, int options) {
253 return waitpid(pid, status, options);
256 // ----------------- sanitizer_common.h
257 bool FileExists(const char *filename) {
259 if (stat(filename, &st))
261 // Sanity check: filename is a regular file.
262 return S_ISREG(st.st_mode);
267 pthread_threadid_np(nullptr, &tid);
271 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
272 uptr *stack_bottom) {
275 uptr stacksize = pthread_get_stacksize_np(pthread_self());
276 // pthread_get_stacksize_np() returns an incorrect stack size for the main
277 // thread on Mavericks. See
278 // https://github.com/google/sanitizers/issues/261
279 if ((GetMacosVersion() >= MACOS_VERSION_MAVERICKS) && at_initialization &&
280 stacksize == (1 << 19)) {
282 CHECK_EQ(getrlimit(RLIMIT_STACK, &rl), 0);
283 // Most often rl.rlim_cur will be the desired 8M.
284 if (rl.rlim_cur < kMaxThreadStackSize) {
285 stacksize = rl.rlim_cur;
287 stacksize = kMaxThreadStackSize;
290 void *stackaddr = pthread_get_stackaddr_np(pthread_self());
291 *stack_top = (uptr)stackaddr;
292 *stack_bottom = *stack_top - stacksize;
295 char **GetEnviron() {
297 char ***env_ptr = _NSGetEnviron();
299 Report("_NSGetEnviron() returned NULL. Please make sure __asan_init() is "
300 "called after libSystem_initializer().\n");
303 char **environ = *env_ptr;
309 const char *GetEnv(const char *name) {
310 char **env = GetEnviron();
311 uptr name_len = internal_strlen(name);
313 uptr len = internal_strlen(*env);
314 if (len > name_len) {
315 const char *p = *env;
316 if (!internal_memcmp(p, name, name_len) &&
317 p[name_len] == '=') { // Match.
318 return *env + name_len + 1; // String starting after =.
326 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
327 CHECK_LE(kMaxPathLength, buf_len);
329 // On OS X the executable path is saved to the stack by dyld. Reading it
330 // from there is much faster than calling dladdr, especially for large
331 // binaries with symbols.
332 InternalScopedString exe_path(kMaxPathLength);
333 uint32_t size = exe_path.size();
334 if (_NSGetExecutablePath(exe_path.data(), &size) == 0 &&
335 realpath(exe_path.data(), buf) != 0) {
336 return internal_strlen(buf);
341 uptr ReadLongProcessName(/*out*/char *buf, uptr buf_len) {
342 return ReadBinaryName(buf, buf_len);
354 return sysconf(_SC_PAGESIZE);
357 extern "C" unsigned malloc_num_zones;
358 extern "C" malloc_zone_t **malloc_zones;
359 malloc_zone_t sanitizer_zone;
361 // We need to make sure that sanitizer_zone is registered as malloc_zones[0]. If
362 // libmalloc tries to set up a different zone as malloc_zones[0], it will call
363 // mprotect(malloc_zones, ..., PROT_READ). This interceptor will catch that and
364 // make sure we are still the first (default) zone.
365 void MprotectMallocZones(void *addr, int prot) {
366 if (addr == malloc_zones && prot == PROT_READ) {
367 if (malloc_num_zones > 1 && malloc_zones[0] != &sanitizer_zone) {
368 for (unsigned i = 1; i < malloc_num_zones; i++) {
369 if (malloc_zones[i] == &sanitizer_zone) {
370 // Swap malloc_zones[0] and malloc_zones[i].
371 malloc_zones[i] = malloc_zones[0];
372 malloc_zones[0] = &sanitizer_zone;
380 BlockingMutex::BlockingMutex() {
381 internal_memset(this, 0, sizeof(*this));
384 void BlockingMutex::Lock() {
385 CHECK(sizeof(OSSpinLock) <= sizeof(opaque_storage_));
386 CHECK_EQ(OS_SPINLOCK_INIT, 0);
388 OSSpinLockLock((OSSpinLock*)&opaque_storage_);
391 void BlockingMutex::Unlock() {
392 OSSpinLockUnlock((OSSpinLock*)&opaque_storage_);
395 void BlockingMutex::CheckLocked() {
396 CHECK_NE(*(OSSpinLock*)&opaque_storage_, 0);
401 internal_memset(&tv, 0, sizeof(tv));
402 gettimeofday(&tv, 0);
403 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
406 // This needs to be called during initialization to avoid being racy.
407 u64 MonotonicNanoTime() {
408 static mach_timebase_info_data_t timebase_info;
409 if (timebase_info.denom == 0) mach_timebase_info(&timebase_info);
410 return (mach_absolute_time() * timebase_info.numer) / timebase_info.denom;
422 #if defined(__x86_64__)
423 asm("movq %%gs:0,%0" : "=r"(segbase));
424 #elif defined(__i386__)
425 asm("movl %%gs:0,%0" : "=r"(segbase));
430 // The size of the tls on darwin does not appear to be well documented,
431 // however the vm memory map suggests that it is 1024 uptrs in size,
432 // with a size of 0x2000 bytes on x86_64 and 0x1000 bytes on i386.
434 #if defined(__x86_64__) || defined(__i386__)
435 return 1024 * sizeof(uptr);
441 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
442 uptr *tls_addr, uptr *tls_size) {
444 uptr stack_top, stack_bottom;
445 GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
446 *stk_addr = stack_bottom;
447 *stk_size = stack_top - stack_bottom;
448 *tls_addr = TlsBaseAddr();
449 *tls_size = TlsSize();
458 void ListOfModules::init() {
460 MemoryMappingLayout memory_mapping(false);
461 memory_mapping.DumpListOfModules(&modules_);
464 void ListOfModules::fallbackInit() { clear(); }
466 static HandleSignalMode GetHandleSignalModeImpl(int signum) {
469 return common_flags()->handle_abort;
471 return common_flags()->handle_sigill;
473 return common_flags()->handle_sigtrap;
475 return common_flags()->handle_sigfpe;
477 return common_flags()->handle_segv;
479 return common_flags()->handle_sigbus;
481 return kHandleSignalNo;
484 HandleSignalMode GetHandleSignalMode(int signum) {
485 // Handling fatal signals on watchOS and tvOS devices is disallowed.
486 if ((SANITIZER_WATCHOS || SANITIZER_TVOS) && !(SANITIZER_IOSSIM))
487 return kHandleSignalNo;
488 HandleSignalMode result = GetHandleSignalModeImpl(signum);
489 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler)
490 return kHandleSignalExclusive;
494 MacosVersion cached_macos_version = MACOS_VERSION_UNINITIALIZED;
496 MacosVersion GetMacosVersionInternal() {
497 int mib[2] = { CTL_KERN, KERN_OSRELEASE };
499 uptr len = 0, maxlen = sizeof(version) / sizeof(version[0]);
500 for (uptr i = 0; i < maxlen; i++) version[i] = '\0';
501 // Get the version length.
502 CHECK_NE(sysctl(mib, 2, 0, &len, 0, 0), -1);
503 CHECK_LT(len, maxlen);
504 CHECK_NE(sysctl(mib, 2, version, &len, 0, 0), -1);
505 switch (version[0]) {
506 case '9': return MACOS_VERSION_LEOPARD;
508 switch (version[1]) {
509 case '0': return MACOS_VERSION_SNOW_LEOPARD;
510 case '1': return MACOS_VERSION_LION;
511 case '2': return MACOS_VERSION_MOUNTAIN_LION;
512 case '3': return MACOS_VERSION_MAVERICKS;
513 case '4': return MACOS_VERSION_YOSEMITE;
515 if (IsDigit(version[1]))
516 return MACOS_VERSION_UNKNOWN_NEWER;
518 return MACOS_VERSION_UNKNOWN;
521 default: return MACOS_VERSION_UNKNOWN;
525 MacosVersion GetMacosVersion() {
526 atomic_uint32_t *cache =
527 reinterpret_cast<atomic_uint32_t*>(&cached_macos_version);
528 MacosVersion result =
529 static_cast<MacosVersion>(atomic_load(cache, memory_order_acquire));
530 if (result == MACOS_VERSION_UNINITIALIZED) {
531 result = GetMacosVersionInternal();
532 atomic_store(cache, result, memory_order_release);
537 bool PlatformHasDifferentMemcpyAndMemmove() {
538 // On OS X 10.7 memcpy() and memmove() are both resolved
539 // into memmove$VARIANT$sse42.
540 // See also https://github.com/google/sanitizers/issues/34.
541 // TODO(glider): need to check dynamically that memcpy() and memmove() are
542 // actually the same function.
543 return GetMacosVersion() == MACOS_VERSION_SNOW_LEOPARD;
547 struct task_basic_info info;
548 unsigned count = TASK_BASIC_INFO_COUNT;
549 kern_return_t result =
550 task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)&info, &count);
551 if (UNLIKELY(result != KERN_SUCCESS)) {
552 Report("Cannot get task info. Error: %d\n", result);
555 return info.resident_size;
558 void *internal_start_thread(void(*func)(void *arg), void *arg) {
559 // Start the thread with signals blocked, otherwise it can steal user signals.
560 __sanitizer_sigset_t set, old;
561 internal_sigfillset(&set);
562 internal_sigprocmask(SIG_SETMASK, &set, &old);
564 pthread_create(&th, 0, (void*(*)(void *arg))func, arg);
565 internal_sigprocmask(SIG_SETMASK, &old, 0);
569 void internal_join_thread(void *th) { pthread_join((pthread_t)th, 0); }
572 static BlockingMutex syslog_lock(LINKER_INITIALIZED);
575 void WriteOneLineToSyslog(const char *s) {
577 syslog_lock.CheckLocked();
578 asl_log(nullptr, nullptr, ASL_LEVEL_ERR, "%s", s);
582 void LogMessageOnPrintf(const char *str) {
583 // Log all printf output to CrashLog.
584 if (common_flags()->abort_on_error)
585 CRAppendCrashLogMessage(str);
588 void LogFullErrorReport(const char *buffer) {
590 // Log with os_trace. This will make it into the crash log.
591 #if SANITIZER_OS_TRACE
592 if (GetMacosVersion() >= MACOS_VERSION_YOSEMITE) {
593 // os_trace requires the message (format parameter) to be a string literal.
594 if (internal_strncmp(SanitizerToolName, "AddressSanitizer",
595 sizeof("AddressSanitizer") - 1) == 0)
596 os_trace("Address Sanitizer reported a failure.");
597 else if (internal_strncmp(SanitizerToolName, "UndefinedBehaviorSanitizer",
598 sizeof("UndefinedBehaviorSanitizer") - 1) == 0)
599 os_trace("Undefined Behavior Sanitizer reported a failure.");
600 else if (internal_strncmp(SanitizerToolName, "ThreadSanitizer",
601 sizeof("ThreadSanitizer") - 1) == 0)
602 os_trace("Thread Sanitizer reported a failure.");
604 os_trace("Sanitizer tool reported a failure.");
606 if (common_flags()->log_to_syslog)
607 os_trace("Consult syslog for more information.");
612 // The logging on OS X may call pthread_create so we need the threading
613 // environment to be fully initialized. Also, this should never be called when
614 // holding the thread registry lock since that may result in a deadlock. If
615 // the reporting thread holds the thread registry mutex, and asl_log waits
616 // for GCD to dispatch a new thread, the process will deadlock, because the
617 // pthread_create wrapper needs to acquire the lock as well.
618 BlockingMutexLock l(&syslog_lock);
619 if (common_flags()->log_to_syslog)
620 WriteToSyslog(buffer);
622 // The report is added to CrashLog as part of logging all of Printf output.
626 SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
627 #if defined(__x86_64__) || defined(__i386__)
628 ucontext_t *ucontext = static_cast<ucontext_t*>(context);
629 return ucontext->uc_mcontext->__es.__err & 2 /*T_PF_WRITE*/ ? WRITE : READ;
635 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
636 ucontext_t *ucontext = (ucontext_t*)context;
637 # if defined(__aarch64__)
638 *pc = ucontext->uc_mcontext->__ss.__pc;
639 # if defined(__IPHONE_8_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_8_0
640 *bp = ucontext->uc_mcontext->__ss.__fp;
642 *bp = ucontext->uc_mcontext->__ss.__lr;
644 *sp = ucontext->uc_mcontext->__ss.__sp;
645 # elif defined(__x86_64__)
646 *pc = ucontext->uc_mcontext->__ss.__rip;
647 *bp = ucontext->uc_mcontext->__ss.__rbp;
648 *sp = ucontext->uc_mcontext->__ss.__rsp;
649 # elif defined(__arm__)
650 *pc = ucontext->uc_mcontext->__ss.__pc;
651 *bp = ucontext->uc_mcontext->__ss.__r[7];
652 *sp = ucontext->uc_mcontext->__ss.__sp;
653 # elif defined(__i386__)
654 *pc = ucontext->uc_mcontext->__ss.__eip;
655 *bp = ucontext->uc_mcontext->__ss.__ebp;
656 *sp = ucontext->uc_mcontext->__ss.__esp;
658 # error "Unknown architecture"
662 void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); }
665 static const char kDyldInsertLibraries[] = "DYLD_INSERT_LIBRARIES";
666 LowLevelAllocator allocator_for_env;
668 // Change the value of the env var |name|, leaking the original value.
669 // If |name_value| is NULL, the variable is deleted from the environment,
670 // otherwise the corresponding "NAME=value" string is replaced with
672 void LeakyResetEnv(const char *name, const char *name_value) {
673 char **env = GetEnviron();
674 uptr name_len = internal_strlen(name);
676 uptr len = internal_strlen(*env);
677 if (len > name_len) {
678 const char *p = *env;
679 if (!internal_memcmp(p, name, name_len) && p[name_len] == '=') {
682 // Replace the old value with the new one.
683 *env = const_cast<char*>(name_value);
685 // Shift the subsequent pointers back.
697 SANITIZER_WEAK_CXX_DEFAULT_IMPL
698 bool ReexecDisabled() {
702 extern "C" SANITIZER_WEAK_ATTRIBUTE double dyldVersionNumber;
703 static const double kMinDyldVersionWithAutoInterposition = 360.0;
705 bool DyldNeedsEnvVariable() {
706 // Although sanitizer support was added to LLVM on OS X 10.7+, GCC users
707 // still may want use them on older systems. On older Darwin platforms, dyld
708 // doesn't export dyldVersionNumber symbol and we simply return true.
709 if (!&dyldVersionNumber) return true;
710 // If running on OS X 10.11+ or iOS 9.0+, dyld will interpose even if
711 // DYLD_INSERT_LIBRARIES is not set. However, checking OS version via
712 // GetMacosVersion() doesn't work for the simulator. Let's instead check
713 // `dyldVersionNumber`, which is exported by dyld, against a known version
714 // number from the first OS release where this appeared.
715 return dyldVersionNumber < kMinDyldVersionWithAutoInterposition;
719 // FIXME: This should really live in some "InitializePlatform" method.
722 if (ReexecDisabled()) return;
724 // Make sure the dynamic runtime library is preloaded so that the
725 // wrappers work. If it is not, set DYLD_INSERT_LIBRARIES and re-exec
728 RAW_CHECK(dladdr((void*)((uptr)&__sanitizer_report_error_summary), &info));
729 char *dyld_insert_libraries =
730 const_cast<char*>(GetEnv(kDyldInsertLibraries));
731 uptr old_env_len = dyld_insert_libraries ?
732 internal_strlen(dyld_insert_libraries) : 0;
733 uptr fname_len = internal_strlen(info.dli_fname);
734 const char *dylib_name = StripModuleName(info.dli_fname);
735 uptr dylib_name_len = internal_strlen(dylib_name);
737 bool lib_is_in_env = dyld_insert_libraries &&
738 internal_strstr(dyld_insert_libraries, dylib_name);
739 if (DyldNeedsEnvVariable() && !lib_is_in_env) {
740 // DYLD_INSERT_LIBRARIES is not set or does not contain the runtime
742 InternalScopedString program_name(1024);
743 uint32_t buf_size = program_name.size();
744 _NSGetExecutablePath(program_name.data(), &buf_size);
745 char *new_env = const_cast<char*>(info.dli_fname);
746 if (dyld_insert_libraries) {
747 // Append the runtime dylib name to the existing value of
748 // DYLD_INSERT_LIBRARIES.
749 new_env = (char*)allocator_for_env.Allocate(old_env_len + fname_len + 2);
750 internal_strncpy(new_env, dyld_insert_libraries, old_env_len);
751 new_env[old_env_len] = ':';
752 // Copy fname_len and add a trailing zero.
753 internal_strncpy(new_env + old_env_len + 1, info.dli_fname,
755 // Ok to use setenv() since the wrappers don't depend on the value of
757 setenv(kDyldInsertLibraries, new_env, /*overwrite*/1);
759 // Set DYLD_INSERT_LIBRARIES equal to the runtime dylib name.
760 setenv(kDyldInsertLibraries, info.dli_fname, /*overwrite*/0);
762 VReport(1, "exec()-ing the program with\n");
763 VReport(1, "%s=%s\n", kDyldInsertLibraries, new_env);
764 VReport(1, "to enable wrappers.\n");
765 execv(program_name.data(), *_NSGetArgv());
767 // We get here only if execv() failed.
768 Report("ERROR: The process is launched without DYLD_INSERT_LIBRARIES, "
769 "which is required for the sanitizer to work. We tried to set the "
770 "environment variable and re-execute itself, but execv() failed, "
771 "possibly because of sandbox restrictions. Make sure to launch the "
772 "executable with:\n%s=%s\n", kDyldInsertLibraries, new_env);
773 RAW_CHECK("execv failed" && 0);
776 // Verify that interceptors really work. We'll use dlsym to locate
777 // "pthread_create", if interceptors are working, it should really point to
778 // "wrap_pthread_create" within our own dylib.
779 Dl_info info_pthread_create;
780 void *dlopen_addr = dlsym(RTLD_DEFAULT, "pthread_create");
781 RAW_CHECK(dladdr(dlopen_addr, &info_pthread_create));
782 if (internal_strcmp(info.dli_fname, info_pthread_create.dli_fname) != 0) {
784 "ERROR: Interceptors are not working. This may be because %s is "
785 "loaded too late (e.g. via dlopen). Please launch the executable "
787 SanitizerToolName, kDyldInsertLibraries, info.dli_fname);
788 RAW_CHECK("interceptors not installed" && 0);
794 if (!common_flags()->strip_env)
797 // DYLD_INSERT_LIBRARIES is set and contains the runtime library. Let's remove
798 // the dylib from the environment variable, because interceptors are installed
799 // and we don't want our children to inherit the variable.
801 uptr env_name_len = internal_strlen(kDyldInsertLibraries);
802 // Allocate memory to hold the previous env var name, its value, the '='
803 // sign and the '\0' char.
804 char *new_env = (char*)allocator_for_env.Allocate(
805 old_env_len + 2 + env_name_len);
807 internal_memset(new_env, '\0', old_env_len + 2 + env_name_len);
808 internal_strncpy(new_env, kDyldInsertLibraries, env_name_len);
809 new_env[env_name_len] = '=';
810 char *new_env_pos = new_env + env_name_len + 1;
812 // Iterate over colon-separated pieces of |dyld_insert_libraries|.
813 char *piece_start = dyld_insert_libraries;
814 char *piece_end = NULL;
815 char *old_env_end = dyld_insert_libraries + old_env_len;
817 if (piece_start[0] == ':') piece_start++;
818 piece_end = internal_strchr(piece_start, ':');
819 if (!piece_end) piece_end = dyld_insert_libraries + old_env_len;
820 if ((uptr)(piece_start - dyld_insert_libraries) > old_env_len) break;
821 uptr piece_len = piece_end - piece_start;
823 char *filename_start =
824 (char *)internal_memrchr(piece_start, '/', piece_len);
825 uptr filename_len = piece_len;
826 if (filename_start) {
828 filename_len = piece_len - (filename_start - piece_start);
830 filename_start = piece_start;
833 // If the current piece isn't the runtime library name,
834 // append it to new_env.
835 if ((dylib_name_len != filename_len) ||
836 (internal_memcmp(filename_start, dylib_name, dylib_name_len) != 0)) {
837 if (new_env_pos != new_env + env_name_len + 1) {
838 new_env_pos[0] = ':';
841 internal_strncpy(new_env_pos, piece_start, piece_len);
842 new_env_pos += piece_len;
844 // Move on to the next piece.
845 piece_start = piece_end;
846 } while (piece_start < old_env_end);
848 // Can't use setenv() here, because it requires the allocator to be
850 // FIXME: instead of filtering DYLD_INSERT_LIBRARIES here, do it in
851 // a separate function called after InitializeAllocator().
852 if (new_env_pos == new_env + env_name_len + 1) new_env = NULL;
853 LeakyResetEnv(kDyldInsertLibraries, new_env);
855 #endif // SANITIZER_GO
858 return *_NSGetArgv();
861 #if defined(__aarch64__) && SANITIZER_IOS && !SANITIZER_IOSSIM
862 // The task_vm_info struct is normally provided by the macOS SDK, but we need
863 // fields only available in 10.12+. Declare the struct manually to be able to
864 // build against older SDKs.
865 struct __sanitizer_task_vm_info {
866 mach_vm_size_t virtual_size;
867 integer_t region_count;
869 mach_vm_size_t resident_size;
870 mach_vm_size_t resident_size_peak;
871 mach_vm_size_t device;
872 mach_vm_size_t device_peak;
873 mach_vm_size_t internal;
874 mach_vm_size_t internal_peak;
875 mach_vm_size_t external;
876 mach_vm_size_t external_peak;
877 mach_vm_size_t reusable;
878 mach_vm_size_t reusable_peak;
879 mach_vm_size_t purgeable_volatile_pmap;
880 mach_vm_size_t purgeable_volatile_resident;
881 mach_vm_size_t purgeable_volatile_virtual;
882 mach_vm_size_t compressed;
883 mach_vm_size_t compressed_peak;
884 mach_vm_size_t compressed_lifetime;
885 mach_vm_size_t phys_footprint;
886 mach_vm_address_t min_address;
887 mach_vm_address_t max_address;
889 #define __SANITIZER_TASK_VM_INFO_COUNT ((mach_msg_type_number_t) \
890 (sizeof(__sanitizer_task_vm_info) / sizeof(natural_t)))
892 uptr GetTaskInfoMaxAddress() {
893 __sanitizer_task_vm_info vm_info = {};
894 mach_msg_type_number_t count = __SANITIZER_TASK_VM_INFO_COUNT;
895 int err = task_info(mach_task_self(), TASK_VM_INFO, (int *)&vm_info, &count);
897 return vm_info.max_address - 1;
899 // xnu cannot provide vm address limit
900 return 0x200000000 - 1;
905 uptr GetMaxUserVirtualAddress() {
906 #if SANITIZER_WORDSIZE == 64
907 # if defined(__aarch64__) && SANITIZER_IOS && !SANITIZER_IOSSIM
908 // Get the maximum VM address
909 static uptr max_vm = GetTaskInfoMaxAddress();
913 return (1ULL << 47) - 1; // 0x00007fffffffffffUL;
915 #else // SANITIZER_WORDSIZE == 32
916 return (1ULL << 32) - 1; // 0xffffffff;
917 #endif // SANITIZER_WORDSIZE
920 uptr GetMaxVirtualAddress() {
921 return GetMaxUserVirtualAddress();
924 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
925 uptr *largest_gap_found,
926 uptr *max_occupied_addr) {
927 typedef vm_region_submap_short_info_data_64_t RegionInfo;
928 enum { kRegionInfoSize = VM_REGION_SUBMAP_SHORT_INFO_COUNT_64 };
929 // Start searching for available memory region past PAGEZERO, which is
930 // 4KB on 32-bit and 4GB on 64-bit.
931 mach_vm_address_t start_address =
932 (SANITIZER_WORDSIZE == 32) ? 0x000000001000 : 0x000100000000;
934 mach_vm_address_t address = start_address;
935 mach_vm_address_t free_begin = start_address;
936 kern_return_t kr = KERN_SUCCESS;
937 if (largest_gap_found) *largest_gap_found = 0;
938 if (max_occupied_addr) *max_occupied_addr = 0;
939 while (kr == KERN_SUCCESS) {
940 mach_vm_size_t vmsize = 0;
943 mach_msg_type_number_t count = kRegionInfoSize;
944 kr = mach_vm_region_recurse(mach_task_self(), &address, &vmsize, &depth,
945 (vm_region_info_t)&vminfo, &count);
946 if (kr == KERN_INVALID_ADDRESS) {
947 // No more regions beyond "address", consider the gap at the end of VM.
948 address = GetMaxVirtualAddress() + 1;
951 if (max_occupied_addr) *max_occupied_addr = address + vmsize;
953 if (free_begin != address) {
954 // We found a free region [free_begin..address-1].
955 uptr gap_start = RoundUpTo((uptr)free_begin + left_padding, alignment);
956 uptr gap_end = RoundDownTo((uptr)address, alignment);
957 uptr gap_size = gap_end > gap_start ? gap_end - gap_start : 0;
958 if (size < gap_size) {
962 if (largest_gap_found && *largest_gap_found < gap_size) {
963 *largest_gap_found = gap_size;
966 // Move to the next region.
968 free_begin = address;
971 // We looked at all free regions and could not find one large enough.
975 // FIXME implement on this platform.
976 void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size) { }
978 void SignalContext::DumpAllRegisters(void *context) {
979 Report("Register values:\n");
981 ucontext_t *ucontext = (ucontext_t*)context;
982 # define DUMPREG64(r) \
983 Printf("%s = 0x%016llx ", #r, ucontext->uc_mcontext->__ss.__ ## r);
984 # define DUMPREG32(r) \
985 Printf("%s = 0x%08x ", #r, ucontext->uc_mcontext->__ss.__ ## r);
986 # define DUMPREG_(r) Printf(" "); DUMPREG(r);
987 # define DUMPREG__(r) Printf(" "); DUMPREG(r);
988 # define DUMPREG___(r) Printf(" "); DUMPREG(r);
990 # if defined(__x86_64__)
991 # define DUMPREG(r) DUMPREG64(r)
992 DUMPREG(rax); DUMPREG(rbx); DUMPREG(rcx); DUMPREG(rdx); Printf("\n");
993 DUMPREG(rdi); DUMPREG(rsi); DUMPREG(rbp); DUMPREG(rsp); Printf("\n");
994 DUMPREG_(r8); DUMPREG_(r9); DUMPREG(r10); DUMPREG(r11); Printf("\n");
995 DUMPREG(r12); DUMPREG(r13); DUMPREG(r14); DUMPREG(r15); Printf("\n");
996 # elif defined(__i386__)
997 # define DUMPREG(r) DUMPREG32(r)
998 DUMPREG(eax); DUMPREG(ebx); DUMPREG(ecx); DUMPREG(edx); Printf("\n");
999 DUMPREG(edi); DUMPREG(esi); DUMPREG(ebp); DUMPREG(esp); Printf("\n");
1000 # elif defined(__aarch64__)
1001 # define DUMPREG(r) DUMPREG64(r)
1002 DUMPREG_(x[0]); DUMPREG_(x[1]); DUMPREG_(x[2]); DUMPREG_(x[3]); Printf("\n");
1003 DUMPREG_(x[4]); DUMPREG_(x[5]); DUMPREG_(x[6]); DUMPREG_(x[7]); Printf("\n");
1004 DUMPREG_(x[8]); DUMPREG_(x[9]); DUMPREG(x[10]); DUMPREG(x[11]); Printf("\n");
1005 DUMPREG(x[12]); DUMPREG(x[13]); DUMPREG(x[14]); DUMPREG(x[15]); Printf("\n");
1006 DUMPREG(x[16]); DUMPREG(x[17]); DUMPREG(x[18]); DUMPREG(x[19]); Printf("\n");
1007 DUMPREG(x[20]); DUMPREG(x[21]); DUMPREG(x[22]); DUMPREG(x[23]); Printf("\n");
1008 DUMPREG(x[24]); DUMPREG(x[25]); DUMPREG(x[26]); DUMPREG(x[27]); Printf("\n");
1009 DUMPREG(x[28]); DUMPREG___(fp); DUMPREG___(lr); DUMPREG___(sp); Printf("\n");
1010 # elif defined(__arm__)
1011 # define DUMPREG(r) DUMPREG32(r)
1012 DUMPREG_(r[0]); DUMPREG_(r[1]); DUMPREG_(r[2]); DUMPREG_(r[3]); Printf("\n");
1013 DUMPREG_(r[4]); DUMPREG_(r[5]); DUMPREG_(r[6]); DUMPREG_(r[7]); Printf("\n");
1014 DUMPREG_(r[8]); DUMPREG_(r[9]); DUMPREG(r[10]); DUMPREG(r[11]); Printf("\n");
1015 DUMPREG(r[12]); DUMPREG___(sp); DUMPREG___(lr); DUMPREG___(pc); Printf("\n");
1017 # error "Unknown architecture"
1028 static inline bool CompareBaseAddress(const LoadedModule &a,
1029 const LoadedModule &b) {
1030 return a.base_address() < b.base_address();
1033 void FormatUUID(char *out, uptr size, const u8 *uuid) {
1034 internal_snprintf(out, size,
1035 "<%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-"
1036 "%02X%02X%02X%02X%02X%02X>",
1037 uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5],
1038 uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11],
1039 uuid[12], uuid[13], uuid[14], uuid[15]);
1042 void PrintModuleMap() {
1043 Printf("Process module map:\n");
1044 MemoryMappingLayout memory_mapping(false);
1045 InternalMmapVector<LoadedModule> modules;
1046 modules.reserve(128);
1047 memory_mapping.DumpListOfModules(&modules);
1048 Sort(modules.data(), modules.size(), CompareBaseAddress);
1049 for (uptr i = 0; i < modules.size(); ++i) {
1051 FormatUUID(uuid_str, sizeof(uuid_str), modules[i].uuid());
1052 Printf("0x%zx-0x%zx %s (%s) %s\n", modules[i].base_address(),
1053 modules[i].max_executable_address(), modules[i].full_name(),
1054 ModuleArchToString(modules[i].arch()), uuid_str);
1056 Printf("End of module map.\n");
1059 void CheckNoDeepBind(const char *filename, int flag) {
1063 // FIXME: implement on this platform.
1064 bool GetRandom(void *buffer, uptr length, bool blocking) {
1068 // FIXME: implement on this platform.
1069 u32 GetNumberOfCPUs() {
1073 } // namespace __sanitizer
1075 #endif // SANITIZER_MAC