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llvm-project/compiler-rt/lib/asan/asan_interceptors.cpp

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//===-- asan_interceptors.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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.cpp 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;
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)
#if CAN_SANITIZE_LEAKS
#define COMMON_INTERCEPTOR_STRERROR() \
__lsan::ScopedInterceptorDisabler disabler
#endif
#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) {
void *ctx;
ASAN_INTERCEPTOR_ENTER(ctx, strcat);
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);
}
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) {
void *ctx;
ASAN_INTERCEPTOR_ENTER(ctx, strcpy);
#if SANITIZER_MAC
if (UNLIKELY(!asan_inited))
return REAL(strcpy)(to, from);
#endif
// strcpy is called from malloc_default_purgeable_zone()
// in __asan::ReplaceSystemAlloc() on Mac.
if (asan_init_is_running) {
return REAL(strcpy)(to, from);
}
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);
}
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, 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);
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) {
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);
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, 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);
StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
return result;
}
INTERCEPTOR(long long, atoll, const char *nptr) {
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);
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 || ASAN_INTERCEPT_ATEXIT
static void AtCxaAtexit(void *unused) {
(void)unused;
StopInitOrderChecking();
}
#endif
#if ASAN_INTERCEPT___CXA_ATEXIT
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();
#if CAN_SANITIZE_LEAKS
__lsan::ScopedInterceptorDisabler disabler;
#endif
int res = REAL(__cxa_atexit)(func, arg, dso_handle);
REAL(__cxa_atexit)(AtCxaAtexit, nullptr, nullptr);
return res;
}
#endif // ASAN_INTERCEPT___CXA_ATEXIT
#if ASAN_INTERCEPT_ATEXIT
INTERCEPTOR(int, atexit, void (*func)()) {
ENSURE_ASAN_INITED();
#if CAN_SANITIZE_LEAKS
__lsan::ScopedInterceptorDisabler disabler;
#endif
// Avoid calling real atexit as it is unrechable on at least on Linux.
int res = REAL(__cxa_atexit)((void (*)(void *a))func, nullptr, nullptr);
REAL(__cxa_atexit)(AtCxaAtexit, nullptr, nullptr);
return res;
}
#endif
#if ASAN_INTERCEPT_PTHREAD_ATFORK
extern "C" {
extern int _pthread_atfork(void (*prepare)(), void (*parent)(),
void (*child)());
};
INTERCEPTOR(int, pthread_atfork, void (*prepare)(), void (*parent)(),
void (*child)()) {
#if CAN_SANITIZE_LEAKS
__lsan::ScopedInterceptorDisabler disabler;
#endif
// REAL(pthread_atfork) cannot be called due to symbol indirections at least
// on NetBSD
return _pthread_atfork(prepare, parent, child);
}
#endif
#if ASAN_INTERCEPT_VFORK
DEFINE_REAL(int, vfork)
DECLARE_EXTERN_INTERCEPTOR_AND_WRAPPER(int, vfork)
#endif
// ---------------------- 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);
ASAN_INTERCEPT_FUNC(strcpy);
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
#if ASAN_INTERCEPT_ATEXIT
ASAN_INTERCEPT_FUNC(atexit);
#endif
#if ASAN_INTERCEPT_PTHREAD_ATFORK
ASAN_INTERCEPT_FUNC(pthread_atfork);
#endif
#if ASAN_INTERCEPT_VFORK
ASAN_INTERCEPT_FUNC(vfork);
#endif
InitializePlatformInterceptors();
VReport(1, "AddressSanitizer: libc interceptors initialized\n");
}
} // namespace __asan
#endif // !SANITIZER_FUCHSIA
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