compiler-rt/lib/asan/asan_interceptors.cc - rust-lang/llvm-project - Git at Google

 //===-- asan_interceptors.cc ----------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file is a part of AddressSanitizer, an address sanity checker.
 //
 // Intercept various libc functions.
 //===----------------------------------------------------------------------===//

 #include "asan_interceptors.h"
 #include "asan_allocator.h"
 #include "asan_internal.h"
 #include "asan_mapping.h"
 #include "asan_poisoning.h"
 #include "asan_report.h"
 #include "asan_stack.h"
 #include "asan_stats.h"
 #include "asan_suppressions.h"
 #include "lsan/lsan_common.h"
 #include "sanitizer_common/sanitizer_libc.h"

 // There is no general interception at all on Fuchsia and RTEMS.
 // Only the functions in asan_interceptors_memintrinsics.cc are
 // really defined to replace libc functions.
 #if !SANITIZER_FUCHSIA && !SANITIZER_RTEMS

 #if SANITIZER_POSIX
 #include "sanitizer_common/sanitizer_posix.h"
 #endif

 #if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION || \
     ASAN_INTERCEPT__SJLJ_UNWIND_RAISEEXCEPTION
 #include <unwind.h>
 #endif

 #if defined(__i386) && SANITIZER_LINUX
 #define ASAN_PTHREAD_CREATE_VERSION "GLIBC_2.1"
 #elif defined(__mips__) && SANITIZER_LINUX
 #define ASAN_PTHREAD_CREATE_VERSION "GLIBC_2.2"
 #endif

 namespace __asan {

 #define ASAN_READ_STRING_OF_LEN(ctx, s, len, n)                 \
   ASAN_READ_RANGE((ctx), (s),                                   \
     common_flags()->strict_string_checks ? (len) + 1 : (n))

 #define ASAN_READ_STRING(ctx, s, n)                             \
   ASAN_READ_STRING_OF_LEN((ctx), (s), REAL(strlen)(s), (n))

 static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) {
 #if SANITIZER_INTERCEPT_STRNLEN
   if (REAL(strnlen)) {
     return REAL(strnlen)(s, maxlen);
   }
 #endif
   return internal_strnlen(s, maxlen);
 }

 void SetThreadName(const char *name) {
   AsanThread *t = GetCurrentThread();
   if (t)
     asanThreadRegistry().SetThreadName(t->tid(), name);
 }

 int OnExit() {
   if (CAN_SANITIZE_LEAKS && common_flags()->detect_leaks &&
       __lsan::HasReportedLeaks()) {
     return common_flags()->exitcode;
   }
   // FIXME: ask frontend whether we need to return failure.
   return 0;
 }

 } // namespace __asan

 // ---------------------- Wrappers ---------------- {{{1
 using namespace __asan;  // NOLINT

 DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr)
 DECLARE_REAL_AND_INTERCEPTOR(void, free, void *)

 #define ASAN_INTERCEPTOR_ENTER(ctx, func)                                      \
   AsanInterceptorContext _ctx = {#func};                                       \
   ctx = (void *)&_ctx;                                                         \
   (void) ctx;                                                                  \

 #define COMMON_INTERCEPT_FUNCTION(name) ASAN_INTERCEPT_FUNC(name)
 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver)                          \
   ASAN_INTERCEPT_FUNC_VER(name, ver)
 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
   ASAN_WRITE_RANGE(ctx, ptr, size)
 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
   ASAN_READ_RANGE(ctx, ptr, size)
 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)                               \
   ASAN_INTERCEPTOR_ENTER(ctx, func);                                           \
   do {                                                                         \
     if (asan_init_is_running)                                                  \
       return REAL(func)(__VA_ARGS__);                                          \
     if (SANITIZER_MAC && UNLIKELY(!asan_inited))                               \
       return REAL(func)(__VA_ARGS__);                                          \
     ENSURE_ASAN_INITED();                                                      \
   } while (false)
 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
   do {                                            \
   } while (false)
 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
   do {                                         \
   } while (false)
 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
   do {                                         \
   } while (false)
 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
   do {                                                      \
   } while (false)
 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) SetThreadName(name)
 // Should be asanThreadRegistry().SetThreadNameByUserId(thread, name)
 // But asan does not remember UserId's for threads (pthread_t);
 // and remembers all ever existed threads, so the linear search by UserId
 // can be slow.
 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
   do {                                                         \
   } while (false)
 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
 // Strict init-order checking is dlopen-hostile:
 // https://github.com/google/sanitizers/issues/178
 #define COMMON_INTERCEPTOR_ON_DLOPEN(filename, flag)                           \
   do {                                                                         \
     if (flags()->strict_init_order)                                            \
       StopInitOrderChecking();                                                 \
     CheckNoDeepBind(filename, flag);                                           \
   } while (false)
 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle)
 #define COMMON_INTERCEPTOR_LIBRARY_UNLOADED()
 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!asan_inited)
 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end)                           \
   if (AsanThread *t = GetCurrentThread()) {                                    \
     *begin = t->tls_begin();                                                   \
     *end = t->tls_end();                                                       \
   } else {                                                                     \
     *begin = *end = 0;                                                         \
   }

 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
   do {                                                       \
     ASAN_INTERCEPTOR_ENTER(ctx, memmove);                    \
     ASAN_MEMMOVE_IMPL(ctx, to, from, size);                  \
   } while (false)

 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
   do {                                                      \
     ASAN_INTERCEPTOR_ENTER(ctx, memcpy);                    \
     ASAN_MEMCPY_IMPL(ctx, to, from, size);                  \
   } while (false)

 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
   do {                                                      \
     ASAN_INTERCEPTOR_ENTER(ctx, memset);                    \
     ASAN_MEMSET_IMPL(ctx, block, c, size);                  \
   } while (false)

 #include "sanitizer_common/sanitizer_common_interceptors.inc"
 #include "sanitizer_common/sanitizer_signal_interceptors.inc"

 // Syscall interceptors don't have contexts, we don't support suppressions
 // for them.
 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) ASAN_READ_RANGE(nullptr, p, s)
 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) ASAN_WRITE_RANGE(nullptr, p, s)
 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
   do {                                       \
     (void)(p);                               \
     (void)(s);                               \
   } while (false)
 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
   do {                                        \
     (void)(p);                                \
     (void)(s);                                \
   } while (false)
 #include "sanitizer_common/sanitizer_common_syscalls.inc"
 #include "sanitizer_common/sanitizer_syscalls_netbsd.inc"

 struct ThreadStartParam {
   atomic_uintptr_t t;
   atomic_uintptr_t is_registered;
 };

 #if ASAN_INTERCEPT_PTHREAD_CREATE
 static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
   ThreadStartParam *param = reinterpret_cast<ThreadStartParam *>(arg);
   AsanThread *t = nullptr;
   while ((t = reinterpret_cast<AsanThread *>(
               atomic_load(&param->t, memory_order_acquire))) == nullptr)
     internal_sched_yield();
   SetCurrentThread(t);
   return t->ThreadStart(GetTid(), &param->is_registered);
 }

 INTERCEPTOR(int, pthread_create, void *thread,
     void *attr, void *(*start_routine)(void*), void *arg) {
   EnsureMainThreadIDIsCorrect();
   // Strict init-order checking is thread-hostile.
   if (flags()->strict_init_order)
     StopInitOrderChecking();
   GET_STACK_TRACE_THREAD;
   int detached = 0;
   if (attr)
     REAL(pthread_attr_getdetachstate)(attr, &detached);
   ThreadStartParam param;
   atomic_store(&param.t, 0, memory_order_relaxed);
   atomic_store(&param.is_registered, 0, memory_order_relaxed);
   int result;
   {
     // Ignore all allocations made by pthread_create: thread stack/TLS may be
     // stored by pthread for future reuse even after thread destruction, and
     // the linked list it's stored in doesn't even hold valid pointers to the
     // objects, the latter are calculated by obscure pointer arithmetic.
 #if CAN_SANITIZE_LEAKS
     __lsan::ScopedInterceptorDisabler disabler;
 #endif
     result = REAL(pthread_create)(thread, attr, asan_thread_start, &param);
   }
   if (result == 0) {
     u32 current_tid = GetCurrentTidOrInvalid();
     AsanThread *t =
         AsanThread::Create(start_routine, arg, current_tid, &stack, detached);
     atomic_store(&param.t, reinterpret_cast<uptr>(t), memory_order_release);
     // Wait until the AsanThread object is initialized and the ThreadRegistry
     // entry is in "started" state. One reason for this is that after this
     // interceptor exits, the child thread's stack may be the only thing holding
     // the |arg| pointer. This may cause LSan to report a leak if leak checking
     // happens at a point when the interceptor has already exited, but the stack
     // range for the child thread is not yet known.
     while (atomic_load(&param.is_registered, memory_order_acquire) == 0)
       internal_sched_yield();
   }
   return result;
 }

 INTERCEPTOR(int, pthread_join, void *t, void **arg) {
   return real_pthread_join(t, arg);
 }

 DEFINE_REAL_PTHREAD_FUNCTIONS
 #endif  // ASAN_INTERCEPT_PTHREAD_CREATE

 #if ASAN_INTERCEPT_SWAPCONTEXT
 static void ClearShadowMemoryForContextStack(uptr stack, uptr ssize) {
   // Align to page size.
   uptr PageSize = GetPageSizeCached();
   uptr bottom = stack & ~(PageSize - 1);
   ssize += stack - bottom;
   ssize = RoundUpTo(ssize, PageSize);
   static const uptr kMaxSaneContextStackSize = 1 << 22;  // 4 Mb
   if (AddrIsInMem(bottom) && ssize && ssize <= kMaxSaneContextStackSize) {
     PoisonShadow(bottom, ssize, 0);
   }
 }

 INTERCEPTOR(int, swapcontext, struct ucontext_t *oucp,
             struct ucontext_t *ucp) {
   static bool reported_warning = false;
   if (!reported_warning) {
     Report("WARNING: ASan doesn't fully support makecontext/swapcontext "
            "functions and may produce false positives in some cases!\n");
     reported_warning = true;
   }
   // Clear shadow memory for new context (it may share stack
   // with current context).
   uptr stack, ssize;
   ReadContextStack(ucp, &stack, &ssize);
   ClearShadowMemoryForContextStack(stack, ssize);
 #if __has_attribute(__indirect_return__) && \
     (defined(__x86_64__) || defined(__i386__))
   int (*real_swapcontext)(struct ucontext_t *, struct ucontext_t *)
     __attribute__((__indirect_return__))
     = REAL(swapcontext);
   int res = real_swapcontext(oucp, ucp);
 #else
   int res = REAL(swapcontext)(oucp, ucp);
 #endif
   // swapcontext technically does not return, but program may swap context to
   // "oucp" later, that would look as if swapcontext() returned 0.
   // We need to clear shadow for ucp once again, as it may be in arbitrary
   // state.
   ClearShadowMemoryForContextStack(stack, ssize);
   return res;
 }
 #endif  // ASAN_INTERCEPT_SWAPCONTEXT

 #if SANITIZER_NETBSD
 #define longjmp __longjmp14
 #define siglongjmp __siglongjmp14
 #endif

 INTERCEPTOR(void, longjmp, void *env, int val) {
   __asan_handle_no_return();
   REAL(longjmp)(env, val);
 }

 #if ASAN_INTERCEPT__LONGJMP
 INTERCEPTOR(void, _longjmp, void *env, int val) {
   __asan_handle_no_return();
   REAL(_longjmp)(env, val);
 }
 #endif

 #if ASAN_INTERCEPT___LONGJMP_CHK
 INTERCEPTOR(void, __longjmp_chk, void *env, int val) {
   __asan_handle_no_return();
   REAL(__longjmp_chk)(env, val);
 }
 #endif

 #if ASAN_INTERCEPT_SIGLONGJMP
 INTERCEPTOR(void, siglongjmp, void *env, int val) {
   __asan_handle_no_return();
   REAL(siglongjmp)(env, val);
 }
 #endif

 #if ASAN_INTERCEPT___CXA_THROW
 INTERCEPTOR(void, __cxa_throw, void *a, void *b, void *c) {
   CHECK(REAL(__cxa_throw));
   __asan_handle_no_return();
   REAL(__cxa_throw)(a, b, c);
 }
 #endif

 #if ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION
 INTERCEPTOR(void, __cxa_rethrow_primary_exception, void *a) {
   CHECK(REAL(__cxa_rethrow_primary_exception));
   __asan_handle_no_return();
   REAL(__cxa_rethrow_primary_exception)(a);
 }
 #endif

 #if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION
 INTERCEPTOR(_Unwind_Reason_Code, _Unwind_RaiseException,
             _Unwind_Exception *object) {
   CHECK(REAL(_Unwind_RaiseException));
   __asan_handle_no_return();
   return REAL(_Unwind_RaiseException)(object);
 }
 #endif

 #if ASAN_INTERCEPT__SJLJ_UNWIND_RAISEEXCEPTION
 INTERCEPTOR(_Unwind_Reason_Code, _Unwind_SjLj_RaiseException,
             _Unwind_Exception *object) {
   CHECK(REAL(_Unwind_SjLj_RaiseException));
   __asan_handle_no_return();
   return REAL(_Unwind_SjLj_RaiseException)(object);
 }
 #endif

 #if ASAN_INTERCEPT_INDEX
 # if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX
 INTERCEPTOR(char*, index, const char *string, int c)
   ALIAS(WRAPPER_NAME(strchr));
 # else
 #  if SANITIZER_MAC
 DECLARE_REAL(char*, index, const char *string, int c)
 OVERRIDE_FUNCTION(index, strchr);
 #  else
 DEFINE_REAL(char*, index, const char *string, int c)
 #  endif
 # endif
 #endif  // ASAN_INTERCEPT_INDEX

 // For both strcat() and strncat() we need to check the validity of |to|
 // argument irrespective of the |from| length.
 INTERCEPTOR(char*, strcat, char *to, const char *from) {  // NOLINT
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strcat);  // NOLINT
   ENSURE_ASAN_INITED();
   if (flags()->replace_str) {
     uptr from_length = REAL(strlen)(from);
     ASAN_READ_RANGE(ctx, from, from_length + 1);
     uptr to_length = REAL(strlen)(to);
     ASAN_READ_STRING_OF_LEN(ctx, to, to_length, to_length);
     ASAN_WRITE_RANGE(ctx, to + to_length, from_length + 1);
     // If the copying actually happens, the |from| string should not overlap
     // with the resulting string starting at |to|, which has a length of
     // to_length + from_length + 1.
     if (from_length > 0) {
       CHECK_RANGES_OVERLAP("strcat", to, from_length + to_length + 1,
                            from, from_length + 1);
     }
   }
   return REAL(strcat)(to, from);  // NOLINT
 }

 INTERCEPTOR(char*, strncat, char *to, const char *from, uptr size) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strncat);
   ENSURE_ASAN_INITED();
   if (flags()->replace_str) {
     uptr from_length = MaybeRealStrnlen(from, size);
     uptr copy_length = Min(size, from_length + 1);
     ASAN_READ_RANGE(ctx, from, copy_length);
     uptr to_length = REAL(strlen)(to);
     ASAN_READ_STRING_OF_LEN(ctx, to, to_length, to_length);
     ASAN_WRITE_RANGE(ctx, to + to_length, from_length + 1);
     if (from_length > 0) {
       CHECK_RANGES_OVERLAP("strncat", to, to_length + copy_length + 1,
                            from, copy_length);
     }
   }
   return REAL(strncat)(to, from, size);
 }

 INTERCEPTOR(char*, strcpy, char *to, const char *from) {  // NOLINT
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strcpy);  // NOLINT
 #if SANITIZER_MAC
   if (UNLIKELY(!asan_inited)) return REAL(strcpy)(to, from);  // NOLINT
 #endif
   // strcpy is called from malloc_default_purgeable_zone()
   // in __asan::ReplaceSystemAlloc() on Mac.
   if (asan_init_is_running) {
     return REAL(strcpy)(to, from);  // NOLINT
   }
   ENSURE_ASAN_INITED();
   if (flags()->replace_str) {
     uptr from_size = REAL(strlen)(from) + 1;
     CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size);
     ASAN_READ_RANGE(ctx, from, from_size);
     ASAN_WRITE_RANGE(ctx, to, from_size);
   }
   return REAL(strcpy)(to, from);  // NOLINT
 }

 INTERCEPTOR(char*, strdup, const char *s) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strdup);
   if (UNLIKELY(!asan_inited)) return internal_strdup(s);
   ENSURE_ASAN_INITED();
   uptr length = REAL(strlen)(s);
   if (flags()->replace_str) {
     ASAN_READ_RANGE(ctx, s, length + 1);
   }
   GET_STACK_TRACE_MALLOC;
   void *new_mem = asan_malloc(length + 1, &stack);
   REAL(memcpy)(new_mem, s, length + 1);
   return reinterpret_cast<char*>(new_mem);
 }

 #if ASAN_INTERCEPT___STRDUP
 INTERCEPTOR(char*, __strdup, const char *s) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strdup);
   if (UNLIKELY(!asan_inited)) return internal_strdup(s);
   ENSURE_ASAN_INITED();
   uptr length = REAL(strlen)(s);
   if (flags()->replace_str) {
     ASAN_READ_RANGE(ctx, s, length + 1);
   }
   GET_STACK_TRACE_MALLOC;
   void *new_mem = asan_malloc(length + 1, &stack);
   REAL(memcpy)(new_mem, s, length + 1);
   return reinterpret_cast<char*>(new_mem);
 }
 #endif // ASAN_INTERCEPT___STRDUP

 INTERCEPTOR(char*, strncpy, char *to, const char *from, uptr size) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strncpy);
   ENSURE_ASAN_INITED();
   if (flags()->replace_str) {
     uptr from_size = Min(size, MaybeRealStrnlen(from, size) + 1);
     CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size);
     ASAN_READ_RANGE(ctx, from, from_size);
     ASAN_WRITE_RANGE(ctx, to, size);
   }
   return REAL(strncpy)(to, from, size);
 }

 INTERCEPTOR(long, strtol, const char *nptr,  // NOLINT
             char **endptr, int base) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strtol);
   ENSURE_ASAN_INITED();
   if (!flags()->replace_str) {
     return REAL(strtol)(nptr, endptr, base);
   }
   char *real_endptr;
   long result = REAL(strtol)(nptr, &real_endptr, base);  // NOLINT
   StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
   return result;
 }

 INTERCEPTOR(int, atoi, const char *nptr) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, atoi);
 #if SANITIZER_MAC
   if (UNLIKELY(!asan_inited)) return REAL(atoi)(nptr);
 #endif
   ENSURE_ASAN_INITED();
   if (!flags()->replace_str) {
     return REAL(atoi)(nptr);
   }
   char *real_endptr;
   // "man atoi" tells that behavior of atoi(nptr) is the same as
   // strtol(nptr, 0, 10), i.e. it sets errno to ERANGE if the
   // parsed integer can't be stored in *long* type (even if it's
   // different from int). So, we just imitate this behavior.
   int result = REAL(strtol)(nptr, &real_endptr, 10);
   FixRealStrtolEndptr(nptr, &real_endptr);
   ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1);
   return result;
 }

 INTERCEPTOR(long, atol, const char *nptr) {  // NOLINT
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, atol);
 #if SANITIZER_MAC
   if (UNLIKELY(!asan_inited)) return REAL(atol)(nptr);
 #endif
   ENSURE_ASAN_INITED();
   if (!flags()->replace_str) {
     return REAL(atol)(nptr);
   }
   char *real_endptr;
   long result = REAL(strtol)(nptr, &real_endptr, 10);  // NOLINT
   FixRealStrtolEndptr(nptr, &real_endptr);
   ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1);
   return result;
 }

 #if ASAN_INTERCEPT_ATOLL_AND_STRTOLL
 INTERCEPTOR(long long, strtoll, const char *nptr,  // NOLINT
             char **endptr, int base) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strtoll);
   ENSURE_ASAN_INITED();
   if (!flags()->replace_str) {
     return REAL(strtoll)(nptr, endptr, base);
   }
   char *real_endptr;
   long long result = REAL(strtoll)(nptr, &real_endptr, base);  // NOLINT
   StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
   return result;
 }

 INTERCEPTOR(long long, atoll, const char *nptr) {  // NOLINT
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, atoll);
   ENSURE_ASAN_INITED();
   if (!flags()->replace_str) {
     return REAL(atoll)(nptr);
   }
   char *real_endptr;
   long long result = REAL(strtoll)(nptr, &real_endptr, 10);  // NOLINT
   FixRealStrtolEndptr(nptr, &real_endptr);
   ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1);
   return result;
 }
 #endif  // ASAN_INTERCEPT_ATOLL_AND_STRTOLL

 #if ASAN_INTERCEPT___CXA_ATEXIT
 static void AtCxaAtexit(void *unused) {
   (void)unused;
   StopInitOrderChecking();
 }

 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
             void *dso_handle) {
 #if SANITIZER_MAC
   if (UNLIKELY(!asan_inited)) return REAL(__cxa_atexit)(func, arg, dso_handle);
 #endif
   ENSURE_ASAN_INITED();
   int res = REAL(__cxa_atexit)(func, arg, dso_handle);
   REAL(__cxa_atexit)(AtCxaAtexit, nullptr, nullptr);
   return res;
 }
 #endif  // ASAN_INTERCEPT___CXA_ATEXIT

 // ---------------------- InitializeAsanInterceptors ---------------- {{{1
 namespace __asan {
 void InitializeAsanInterceptors() {
   static bool was_called_once;
   CHECK(!was_called_once);
   was_called_once = true;
   InitializeCommonInterceptors();
   InitializeSignalInterceptors();

   // Intercept str* functions.
   ASAN_INTERCEPT_FUNC(strcat);  // NOLINT
   ASAN_INTERCEPT_FUNC(strcpy);  // NOLINT
   ASAN_INTERCEPT_FUNC(strncat);
   ASAN_INTERCEPT_FUNC(strncpy);
   ASAN_INTERCEPT_FUNC(strdup);
 #if ASAN_INTERCEPT___STRDUP
   ASAN_INTERCEPT_FUNC(__strdup);
 #endif
 #if ASAN_INTERCEPT_INDEX && ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX
   ASAN_INTERCEPT_FUNC(index);
 #endif

   ASAN_INTERCEPT_FUNC(atoi);
   ASAN_INTERCEPT_FUNC(atol);
   ASAN_INTERCEPT_FUNC(strtol);
 #if ASAN_INTERCEPT_ATOLL_AND_STRTOLL
   ASAN_INTERCEPT_FUNC(atoll);
   ASAN_INTERCEPT_FUNC(strtoll);
 #endif

   // Intecept jump-related functions.
   ASAN_INTERCEPT_FUNC(longjmp);

 #if ASAN_INTERCEPT_SWAPCONTEXT
   ASAN_INTERCEPT_FUNC(swapcontext);
 #endif
 #if ASAN_INTERCEPT__LONGJMP
   ASAN_INTERCEPT_FUNC(_longjmp);
 #endif
 #if ASAN_INTERCEPT___LONGJMP_CHK
   ASAN_INTERCEPT_FUNC(__longjmp_chk);
 #endif
 #if ASAN_INTERCEPT_SIGLONGJMP
   ASAN_INTERCEPT_FUNC(siglongjmp);
 #endif

   // Intercept exception handling functions.
 #if ASAN_INTERCEPT___CXA_THROW
   ASAN_INTERCEPT_FUNC(__cxa_throw);
 #endif
 #if ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION
   ASAN_INTERCEPT_FUNC(__cxa_rethrow_primary_exception);
 #endif
   // Indirectly intercept std::rethrow_exception.
 #if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION
   INTERCEPT_FUNCTION(_Unwind_RaiseException);
 #endif
   // Indirectly intercept std::rethrow_exception.
 #if ASAN_INTERCEPT__UNWIND_SJLJ_RAISEEXCEPTION
   INTERCEPT_FUNCTION(_Unwind_SjLj_RaiseException);
 #endif

   // Intercept threading-related functions
 #if ASAN_INTERCEPT_PTHREAD_CREATE
 #if defined(ASAN_PTHREAD_CREATE_VERSION)
   ASAN_INTERCEPT_FUNC_VER(pthread_create, ASAN_PTHREAD_CREATE_VERSION);
 #else
   ASAN_INTERCEPT_FUNC(pthread_create);
 #endif
   ASAN_INTERCEPT_FUNC(pthread_join);
 #endif

   // Intercept atexit function.
 #if ASAN_INTERCEPT___CXA_ATEXIT
   ASAN_INTERCEPT_FUNC(__cxa_atexit);
 #endif

   InitializePlatformInterceptors();

   VReport(1, "AddressSanitizer: libc interceptors initialized\n");
 }

 } // namespace __asan

 #endif  // !SANITIZER_FUCHSIA
	//===-- asan_interceptors.cc ----------------------------------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file is a part of AddressSanitizer, an address sanity checker.
	//
	// Intercept various libc functions.
	//===----------------------------------------------------------------------===//

	#include "asan_interceptors.h"
	#include "asan_allocator.h"
	#include "asan_internal.h"
	#include "asan_mapping.h"
	#include "asan_poisoning.h"
	#include "asan_report.h"
	#include "asan_stack.h"
	#include "asan_stats.h"
	#include "asan_suppressions.h"
	#include "lsan/lsan_common.h"
	#include "sanitizer_common/sanitizer_libc.h"

	// There is no general interception at all on Fuchsia and RTEMS.
	// Only the functions in asan_interceptors_memintrinsics.cc are
	// really defined to replace libc functions.
	#if !SANITIZER_FUCHSIA && !SANITIZER_RTEMS

	#if SANITIZER_POSIX
	#include "sanitizer_common/sanitizer_posix.h"
	#endif

	#if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION \|\| \
	ASAN_INTERCEPT__SJLJ_UNWIND_RAISEEXCEPTION
	#include <unwind.h>
	#endif

	#if defined(__i386) && SANITIZER_LINUX
	#define ASAN_PTHREAD_CREATE_VERSION "GLIBC_2.1"
	#elif defined(__mips__) && SANITIZER_LINUX
	#define ASAN_PTHREAD_CREATE_VERSION "GLIBC_2.2"
	#endif

	namespace __asan {

	#define ASAN_READ_STRING_OF_LEN(ctx, s, len, n) \
	ASAN_READ_RANGE((ctx), (s), \
	common_flags()->strict_string_checks ? (len) + 1 : (n))

	#define ASAN_READ_STRING(ctx, s, n) \
	ASAN_READ_STRING_OF_LEN((ctx), (s), REAL(strlen)(s), (n))

	static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) {
	#if SANITIZER_INTERCEPT_STRNLEN
	if (REAL(strnlen)) {
	return REAL(strnlen)(s, maxlen);
	}
	#endif
	return internal_strnlen(s, maxlen);
	}

	void SetThreadName(const char *name) {
	AsanThread *t = GetCurrentThread();
	if (t)
	asanThreadRegistry().SetThreadName(t->tid(), name);
	}

	int OnExit() {
	if (CAN_SANITIZE_LEAKS && common_flags()->detect_leaks &&
	__lsan::HasReportedLeaks()) {
	return common_flags()->exitcode;
	}
	// FIXME: ask frontend whether we need to return failure.
	return 0;
	}

	} // namespace __asan

	// ---------------------- Wrappers ---------------- {{{1
	using namespace __asan; // NOLINT

	DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr)
	DECLARE_REAL_AND_INTERCEPTOR(void, free, void *)

	#define ASAN_INTERCEPTOR_ENTER(ctx, func) \
	AsanInterceptorContext _ctx = {#func}; \
	ctx = (void *)&_ctx; \
	(void) ctx; \

	#define COMMON_INTERCEPT_FUNCTION(name) ASAN_INTERCEPT_FUNC(name)
	#define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
	ASAN_INTERCEPT_FUNC_VER(name, ver)
	#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
	ASAN_WRITE_RANGE(ctx, ptr, size)
	#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
	ASAN_READ_RANGE(ctx, ptr, size)
	#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
	ASAN_INTERCEPTOR_ENTER(ctx, func); \
	do { \
	if (asan_init_is_running) \
	return REAL(func)(__VA_ARGS__); \
	if (SANITIZER_MAC && UNLIKELY(!asan_inited)) \
	return REAL(func)(__VA_ARGS__); \
	ENSURE_ASAN_INITED(); \
	} while (false)
	#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
	do { \
	} while (false)
	#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
	do { \
	} while (false)
	#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
	do { \
	} while (false)
	#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
	do { \
	} while (false)
	#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) SetThreadName(name)
	// Should be asanThreadRegistry().SetThreadNameByUserId(thread, name)
	// But asan does not remember UserId's for threads (pthread_t);
	// and remembers all ever existed threads, so the linear search by UserId
	// can be slow.
	#define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
	do { \
	} while (false)
	#define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
	// Strict init-order checking is dlopen-hostile:
	// https://github.com/google/sanitizers/issues/178
	#define COMMON_INTERCEPTOR_ON_DLOPEN(filename, flag) \
	do { \
	if (flags()->strict_init_order) \
	StopInitOrderChecking(); \
	CheckNoDeepBind(filename, flag); \
	} while (false)
	#define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
	#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle)
	#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED()
	#define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!asan_inited)
	#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
	if (AsanThread *t = GetCurrentThread()) { \
	*begin = t->tls_begin(); \
	*end = t->tls_end(); \
	} else { \
	begin = end = 0; \
	}

	#define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
	do { \
	ASAN_INTERCEPTOR_ENTER(ctx, memmove); \
	ASAN_MEMMOVE_IMPL(ctx, to, from, size); \
	} while (false)

	#define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
	do { \
	ASAN_INTERCEPTOR_ENTER(ctx, memcpy); \
	ASAN_MEMCPY_IMPL(ctx, to, from, size); \
	} while (false)

	#define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
	do { \
	ASAN_INTERCEPTOR_ENTER(ctx, memset); \
	ASAN_MEMSET_IMPL(ctx, block, c, size); \
	} while (false)

	#include "sanitizer_common/sanitizer_common_interceptors.inc"
	#include "sanitizer_common/sanitizer_signal_interceptors.inc"

	// Syscall interceptors don't have contexts, we don't support suppressions
	// for them.
	#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) ASAN_READ_RANGE(nullptr, p, s)
	#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) ASAN_WRITE_RANGE(nullptr, p, s)
	#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
	do { \
	(void)(p); \
	(void)(s); \
	} while (false)
	#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
	do { \
	(void)(p); \
	(void)(s); \
	} while (false)
	#include "sanitizer_common/sanitizer_common_syscalls.inc"
	#include "sanitizer_common/sanitizer_syscalls_netbsd.inc"

	struct ThreadStartParam {
	atomic_uintptr_t t;
	atomic_uintptr_t is_registered;
	};

	#if ASAN_INTERCEPT_PTHREAD_CREATE
	static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
	ThreadStartParam param = reinterpret_cast<ThreadStartParam >(arg);
	AsanThread *t = nullptr;
	while ((t = reinterpret_cast<AsanThread *>(
	atomic_load(&param->t, memory_order_acquire))) == nullptr)
	internal_sched_yield();
	SetCurrentThread(t);
	return t->ThreadStart(GetTid(), &param->is_registered);
	}

	INTERCEPTOR(int, pthread_create, void *thread,
	void attr, void (start_routine)(void), void *arg) {
	EnsureMainThreadIDIsCorrect();
	// Strict init-order checking is thread-hostile.
	if (flags()->strict_init_order)
	StopInitOrderChecking();
	GET_STACK_TRACE_THREAD;
	int detached = 0;
	if (attr)
	REAL(pthread_attr_getdetachstate)(attr, &detached);
	ThreadStartParam param;
	atomic_store(&param.t, 0, memory_order_relaxed);
	atomic_store(&param.is_registered, 0, memory_order_relaxed);
	int result;
	{
	// Ignore all allocations made by pthread_create: thread stack/TLS may be
	// stored by pthread for future reuse even after thread destruction, and
	// the linked list it's stored in doesn't even hold valid pointers to the
	// objects, the latter are calculated by obscure pointer arithmetic.
	#if CAN_SANITIZE_LEAKS
	__lsan::ScopedInterceptorDisabler disabler;
	#endif
	result = REAL(pthread_create)(thread, attr, asan_thread_start, &param);
	}
	if (result == 0) {
	u32 current_tid = GetCurrentTidOrInvalid();
	AsanThread *t =
	AsanThread::Create(start_routine, arg, current_tid, &stack, detached);
	atomic_store(&param.t, reinterpret_cast<uptr>(t), memory_order_release);
	// Wait until the AsanThread object is initialized and the ThreadRegistry
	// entry is in "started" state. One reason for this is that after this
	// interceptor exits, the child thread's stack may be the only thing holding
	// the \|arg\| pointer. This may cause LSan to report a leak if leak checking
	// happens at a point when the interceptor has already exited, but the stack
	// range for the child thread is not yet known.
	while (atomic_load(&param.is_registered, memory_order_acquire) == 0)
	internal_sched_yield();
	}
	return result;
	}

	INTERCEPTOR(int, pthread_join, void t, void *arg) {
	return real_pthread_join(t, arg);
	}

	DEFINE_REAL_PTHREAD_FUNCTIONS
	#endif // ASAN_INTERCEPT_PTHREAD_CREATE

	#if ASAN_INTERCEPT_SWAPCONTEXT
	static void ClearShadowMemoryForContextStack(uptr stack, uptr ssize) {
	// Align to page size.
	uptr PageSize = GetPageSizeCached();
	uptr bottom = stack & ~(PageSize - 1);
	ssize += stack - bottom;
	ssize = RoundUpTo(ssize, PageSize);
	static const uptr kMaxSaneContextStackSize = 1 << 22; // 4 Mb
	if (AddrIsInMem(bottom) && ssize && ssize <= kMaxSaneContextStackSize) {
	PoisonShadow(bottom, ssize, 0);
	}
	}

	INTERCEPTOR(int, swapcontext, struct ucontext_t *oucp,
	struct ucontext_t *ucp) {
	static bool reported_warning = false;
	if (!reported_warning) {
	Report("WARNING: ASan doesn't fully support makecontext/swapcontext "
	"functions and may produce false positives in some cases!\n");
	reported_warning = true;
	}
	// Clear shadow memory for new context (it may share stack
	// with current context).
	uptr stack, ssize;
	ReadContextStack(ucp, &stack, &ssize);
	ClearShadowMemoryForContextStack(stack, ssize);
	#if __has_attribute(__indirect_return__) && \
	(defined(__x86_64__) \|\| defined(__i386__))
	int (real_swapcontext)(struct ucontext_t , struct ucontext_t *)
	__attribute__((__indirect_return__))
	= REAL(swapcontext);
	int res = real_swapcontext(oucp, ucp);
	#else
	int res = REAL(swapcontext)(oucp, ucp);
	#endif
	// swapcontext technically does not return, but program may swap context to
	// "oucp" later, that would look as if swapcontext() returned 0.
	// We need to clear shadow for ucp once again, as it may be in arbitrary
	// state.
	ClearShadowMemoryForContextStack(stack, ssize);
	return res;
	}
	#endif // ASAN_INTERCEPT_SWAPCONTEXT

	#if SANITIZER_NETBSD
	#define longjmp __longjmp14
	#define siglongjmp __siglongjmp14
	#endif

	INTERCEPTOR(void, longjmp, void *env, int val) {
	__asan_handle_no_return();
	REAL(longjmp)(env, val);
	}

	#if ASAN_INTERCEPT__LONGJMP
	INTERCEPTOR(void, _longjmp, void *env, int val) {
	__asan_handle_no_return();
	REAL(_longjmp)(env, val);
	}
	#endif

	#if ASAN_INTERCEPT___LONGJMP_CHK
	INTERCEPTOR(void, __longjmp_chk, void *env, int val) {
	__asan_handle_no_return();
	REAL(__longjmp_chk)(env, val);
	}
	#endif

	#if ASAN_INTERCEPT_SIGLONGJMP
	INTERCEPTOR(void, siglongjmp, void *env, int val) {
	__asan_handle_no_return();
	REAL(siglongjmp)(env, val);
	}
	#endif

	#if ASAN_INTERCEPT___CXA_THROW
	INTERCEPTOR(void, __cxa_throw, void a, void b, void *c) {
	CHECK(REAL(__cxa_throw));
	__asan_handle_no_return();
	REAL(__cxa_throw)(a, b, c);
	}
	#endif

	#if ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION
	INTERCEPTOR(void, __cxa_rethrow_primary_exception, void *a) {
	CHECK(REAL(__cxa_rethrow_primary_exception));
	__asan_handle_no_return();
	REAL(__cxa_rethrow_primary_exception)(a);
	}
	#endif

	#if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION
	INTERCEPTOR(_Unwind_Reason_Code, _Unwind_RaiseException,
	_Unwind_Exception *object) {
	CHECK(REAL(_Unwind_RaiseException));
	__asan_handle_no_return();
	return REAL(_Unwind_RaiseException)(object);
	}
	#endif

	#if ASAN_INTERCEPT__SJLJ_UNWIND_RAISEEXCEPTION
	INTERCEPTOR(_Unwind_Reason_Code, _Unwind_SjLj_RaiseException,
	_Unwind_Exception *object) {
	CHECK(REAL(_Unwind_SjLj_RaiseException));
	__asan_handle_no_return();
	return REAL(_Unwind_SjLj_RaiseException)(object);
	}
	#endif

	#if ASAN_INTERCEPT_INDEX
	# if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX
	INTERCEPTOR(char, index, const char string, int c)
	ALIAS(WRAPPER_NAME(strchr));
	# else
	# if SANITIZER_MAC
	DECLARE_REAL(char, index, const char string, int c)
	OVERRIDE_FUNCTION(index, strchr);
	# else
	DEFINE_REAL(char, index, const char string, int c)
	# endif
	# endif
	#endif // ASAN_INTERCEPT_INDEX

	// For both strcat() and strncat() we need to check the validity of \|to\|
	// argument irrespective of the \|from\| length.
	INTERCEPTOR(char, strcat, char to, const char *from) { // NOLINT
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, strcat); // NOLINT
	ENSURE_ASAN_INITED();
	if (flags()->replace_str) {
	uptr from_length = REAL(strlen)(from);
	ASAN_READ_RANGE(ctx, from, from_length + 1);
	uptr to_length = REAL(strlen)(to);
	ASAN_READ_STRING_OF_LEN(ctx, to, to_length, to_length);
	ASAN_WRITE_RANGE(ctx, to + to_length, from_length + 1);
	// If the copying actually happens, the \|from\| string should not overlap
	// with the resulting string starting at \|to\|, which has a length of
	// to_length + from_length + 1.
	if (from_length > 0) {
	CHECK_RANGES_OVERLAP("strcat", to, from_length + to_length + 1,
	from, from_length + 1);
	}
	}
	return REAL(strcat)(to, from); // NOLINT
	}

	INTERCEPTOR(char, strncat, char to, const char *from, uptr size) {
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, strncat);
	ENSURE_ASAN_INITED();
	if (flags()->replace_str) {
	uptr from_length = MaybeRealStrnlen(from, size);
	uptr copy_length = Min(size, from_length + 1);
	ASAN_READ_RANGE(ctx, from, copy_length);
	uptr to_length = REAL(strlen)(to);
	ASAN_READ_STRING_OF_LEN(ctx, to, to_length, to_length);
	ASAN_WRITE_RANGE(ctx, to + to_length, from_length + 1);
	if (from_length > 0) {
	CHECK_RANGES_OVERLAP("strncat", to, to_length + copy_length + 1,
	from, copy_length);
	}
	}
	return REAL(strncat)(to, from, size);
	}

	INTERCEPTOR(char, strcpy, char to, const char *from) { // NOLINT
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, strcpy); // NOLINT
	#if SANITIZER_MAC
	if (UNLIKELY(!asan_inited)) return REAL(strcpy)(to, from); // NOLINT
	#endif
	// strcpy is called from malloc_default_purgeable_zone()
	// in __asan::ReplaceSystemAlloc() on Mac.
	if (asan_init_is_running) {
	return REAL(strcpy)(to, from); // NOLINT
	}
	ENSURE_ASAN_INITED();
	if (flags()->replace_str) {
	uptr from_size = REAL(strlen)(from) + 1;
	CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size);
	ASAN_READ_RANGE(ctx, from, from_size);
	ASAN_WRITE_RANGE(ctx, to, from_size);
	}
	return REAL(strcpy)(to, from); // NOLINT
	}

	INTERCEPTOR(char, strdup, const char s) {
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, strdup);
	if (UNLIKELY(!asan_inited)) return internal_strdup(s);
	ENSURE_ASAN_INITED();
	uptr length = REAL(strlen)(s);
	if (flags()->replace_str) {
	ASAN_READ_RANGE(ctx, s, length + 1);
	}
	GET_STACK_TRACE_MALLOC;
	void *new_mem = asan_malloc(length + 1, &stack);
	REAL(memcpy)(new_mem, s, length + 1);
	return reinterpret_cast<char*>(new_mem);
	}

	#if ASAN_INTERCEPT___STRDUP
	INTERCEPTOR(char, __strdup, const char s) {
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, strdup);
	if (UNLIKELY(!asan_inited)) return internal_strdup(s);
	ENSURE_ASAN_INITED();
	uptr length = REAL(strlen)(s);
	if (flags()->replace_str) {
	ASAN_READ_RANGE(ctx, s, length + 1);
	}
	GET_STACK_TRACE_MALLOC;
	void *new_mem = asan_malloc(length + 1, &stack);
	REAL(memcpy)(new_mem, s, length + 1);
	return reinterpret_cast<char*>(new_mem);
	}
	#endif // ASAN_INTERCEPT___STRDUP

	INTERCEPTOR(char, strncpy, char to, const char *from, uptr size) {
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, strncpy);
	ENSURE_ASAN_INITED();
	if (flags()->replace_str) {
	uptr from_size = Min(size, MaybeRealStrnlen(from, size) + 1);
	CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size);
	ASAN_READ_RANGE(ctx, from, from_size);
	ASAN_WRITE_RANGE(ctx, to, size);
	}
	return REAL(strncpy)(to, from, size);
	}

	INTERCEPTOR(long, strtol, const char *nptr, // NOLINT
	char **endptr, int base) {
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, strtol);
	ENSURE_ASAN_INITED();
	if (!flags()->replace_str) {
	return REAL(strtol)(nptr, endptr, base);
	}
	char *real_endptr;
	long result = REAL(strtol)(nptr, &real_endptr, base); // NOLINT
	StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
	return result;
	}

	INTERCEPTOR(int, atoi, const char *nptr) {
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, atoi);
	#if SANITIZER_MAC
	if (UNLIKELY(!asan_inited)) return REAL(atoi)(nptr);
	#endif
	ENSURE_ASAN_INITED();
	if (!flags()->replace_str) {
	return REAL(atoi)(nptr);
	}
	char *real_endptr;
	// "man atoi" tells that behavior of atoi(nptr) is the same as
	// strtol(nptr, 0, 10), i.e. it sets errno to ERANGE if the
	// parsed integer can't be stored in long type (even if it's
	// different from int). So, we just imitate this behavior.
	int result = REAL(strtol)(nptr, &real_endptr, 10);
	FixRealStrtolEndptr(nptr, &real_endptr);
	ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1);
	return result;
	}

	INTERCEPTOR(long, atol, const char *nptr) { // NOLINT
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, atol);
	#if SANITIZER_MAC
	if (UNLIKELY(!asan_inited)) return REAL(atol)(nptr);
	#endif
	ENSURE_ASAN_INITED();
	if (!flags()->replace_str) {
	return REAL(atol)(nptr);
	}
	char *real_endptr;
	long result = REAL(strtol)(nptr, &real_endptr, 10); // NOLINT
	FixRealStrtolEndptr(nptr, &real_endptr);
	ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1);
	return result;
	}

	#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL
	INTERCEPTOR(long long, strtoll, const char *nptr, // NOLINT
	char **endptr, int base) {
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, strtoll);
	ENSURE_ASAN_INITED();
	if (!flags()->replace_str) {
	return REAL(strtoll)(nptr, endptr, base);
	}
	char *real_endptr;
	long long result = REAL(strtoll)(nptr, &real_endptr, base); // NOLINT
	StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
	return result;
	}

	INTERCEPTOR(long long, atoll, const char *nptr) { // NOLINT
	void *ctx;
	ASAN_INTERCEPTOR_ENTER(ctx, atoll);
	ENSURE_ASAN_INITED();
	if (!flags()->replace_str) {
	return REAL(atoll)(nptr);
	}
	char *real_endptr;
	long long result = REAL(strtoll)(nptr, &real_endptr, 10); // NOLINT
	FixRealStrtolEndptr(nptr, &real_endptr);
	ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1);
	return result;
	}
	#endif // ASAN_INTERCEPT_ATOLL_AND_STRTOLL

	#if ASAN_INTERCEPT___CXA_ATEXIT
	static void AtCxaAtexit(void *unused) {
	(void)unused;
	StopInitOrderChecking();
	}

	INTERCEPTOR(int, __cxa_atexit, void (func)(void ), void *arg,
	void *dso_handle) {
	#if SANITIZER_MAC
	if (UNLIKELY(!asan_inited)) return REAL(__cxa_atexit)(func, arg, dso_handle);
	#endif
	ENSURE_ASAN_INITED();
	int res = REAL(__cxa_atexit)(func, arg, dso_handle);
	REAL(__cxa_atexit)(AtCxaAtexit, nullptr, nullptr);
	return res;
	}
	#endif // ASAN_INTERCEPT___CXA_ATEXIT

	// ---------------------- InitializeAsanInterceptors ---------------- {{{1
	namespace __asan {
	void InitializeAsanInterceptors() {
	static bool was_called_once;
	CHECK(!was_called_once);
	was_called_once = true;
	InitializeCommonInterceptors();
	InitializeSignalInterceptors();

	// Intercept str* functions.
	ASAN_INTERCEPT_FUNC(strcat); // NOLINT
	ASAN_INTERCEPT_FUNC(strcpy); // NOLINT
	ASAN_INTERCEPT_FUNC(strncat);
	ASAN_INTERCEPT_FUNC(strncpy);
	ASAN_INTERCEPT_FUNC(strdup);
	#if ASAN_INTERCEPT___STRDUP
	ASAN_INTERCEPT_FUNC(__strdup);
	#endif
	#if ASAN_INTERCEPT_INDEX && ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX
	ASAN_INTERCEPT_FUNC(index);
	#endif

	ASAN_INTERCEPT_FUNC(atoi);
	ASAN_INTERCEPT_FUNC(atol);
	ASAN_INTERCEPT_FUNC(strtol);
	#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL
	ASAN_INTERCEPT_FUNC(atoll);
	ASAN_INTERCEPT_FUNC(strtoll);
	#endif

	// Intecept jump-related functions.
	ASAN_INTERCEPT_FUNC(longjmp);

	#if ASAN_INTERCEPT_SWAPCONTEXT
	ASAN_INTERCEPT_FUNC(swapcontext);
	#endif
	#if ASAN_INTERCEPT__LONGJMP
	ASAN_INTERCEPT_FUNC(_longjmp);
	#endif
	#if ASAN_INTERCEPT___LONGJMP_CHK
	ASAN_INTERCEPT_FUNC(__longjmp_chk);
	#endif
	#if ASAN_INTERCEPT_SIGLONGJMP
	ASAN_INTERCEPT_FUNC(siglongjmp);
	#endif

	// Intercept exception handling functions.
	#if ASAN_INTERCEPT___CXA_THROW
	ASAN_INTERCEPT_FUNC(__cxa_throw);
	#endif
	#if ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION
	ASAN_INTERCEPT_FUNC(__cxa_rethrow_primary_exception);
	#endif
	// Indirectly intercept std::rethrow_exception.
	#if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION
	INTERCEPT_FUNCTION(_Unwind_RaiseException);
	#endif
	// Indirectly intercept std::rethrow_exception.
	#if ASAN_INTERCEPT__UNWIND_SJLJ_RAISEEXCEPTION
	INTERCEPT_FUNCTION(_Unwind_SjLj_RaiseException);
	#endif

	// Intercept threading-related functions
	#if ASAN_INTERCEPT_PTHREAD_CREATE
	#if defined(ASAN_PTHREAD_CREATE_VERSION)
	ASAN_INTERCEPT_FUNC_VER(pthread_create, ASAN_PTHREAD_CREATE_VERSION);
	#else
	ASAN_INTERCEPT_FUNC(pthread_create);
	#endif
	ASAN_INTERCEPT_FUNC(pthread_join);
	#endif

	// Intercept atexit function.
	#if ASAN_INTERCEPT___CXA_ATEXIT
	ASAN_INTERCEPT_FUNC(__cxa_atexit);
	#endif

	InitializePlatformInterceptors();

	VReport(1, "AddressSanitizer: libc interceptors initialized\n");
	}

	} // namespace __asan

	#endif // !SANITIZER_FUCHSIA