| //===-- 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(¶m->t, memory_order_acquire))) == nullptr) |
| internal_sched_yield(); |
| SetCurrentThread(t); |
| return t->ThreadStart(GetTid(), ¶m->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(¶m.t, 0, memory_order_relaxed); |
| atomic_store(¶m.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, ¶m); |
| } |
| if (result == 0) { |
| u32 current_tid = GetCurrentTidOrInvalid(); |
| AsanThread *t = |
| AsanThread::Create(start_routine, arg, current_tid, &stack, detached); |
| atomic_store(¶m.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(¶m.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 |