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clang-p2996/compiler-rt/lib/asan/asan_interceptors.cpp
Dmitry Vyukov 97b4e63117 tsan: fix false positives in dynamic libs with static tls 
The added test demonstrates  loading a dynamic library with static TLS.
Such static TLS is a hack that allows a dynamic library to have faster TLS,
but it can be loaded only iff all threads happened to allocate some excess
of static TLS space for whatever reason. If it's not the case loading fails with:

dlopen: cannot load any more object with static TLS

We used to produce a false positive because dlopen will write into TLS
of all existing threads to initialize/zero TLS region for the loaded library.
And this appears to be racing with initialization of TLS in the thread
since we model a write into the whole static TLS region (we don't what part
of it is currently unused):

WARNING: ThreadSanitizer: data race (pid=2317365)
  Write of size 1 at 0x7f1fa9bfcdd7 by main thread:
    0 memset
    1 init_one_static_tls
    2 __pthread_init_static_tls
    [[ this is where main calls dlopen ]]
    3 main
  Previous write of size 8 at 0x7f1fa9bfcdd0 by thread T1:
    0 __tsan_tls_initialization

Fix this by ignoring accesses during dlopen.

Reviewed By: melver

Differential Revision: https://reviews.llvm.org/D114953
2021-12-02 17:47:05 +01:00

712 lines
23 KiB
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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.
// Only the functions in asan_interceptors_memintrinsics.cpp are
// really defined to replace libc functions.
#if !SANITIZER_FUCHSIA
# 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), internal_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_INTERCEPT_FUNCTION_VER_UNVERSIONED_FALLBACK(name, ver) \
ASAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(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_DLOPEN(filename, flag) \
({ \
if (flags()->strict_init_order) \
StopInitOrderChecking(); \
CheckNoDeepBind(filename, flag); \
REAL(dlopen)(filename, flag); \
})
# 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"
#if ASAN_INTERCEPT_PTHREAD_CREATE
static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
AsanThread *t = (AsanThread *)arg;
SetCurrentThread(t);
return t->ThreadStart(GetTid());
}
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);
u32 current_tid = GetCurrentTidOrInvalid();
AsanThread *t =
AsanThread::Create(start_routine, arg, current_tid, &stack, detached);
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, t);
}
if (result != 0) {
// If the thread didn't start delete the AsanThread to avoid leaking it.
// Note AsanThreadContexts never get destroyed so the AsanThreadContext
// that was just created for the AsanThread is wasted.
t->Destroy();
}
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 = internal_strlen(from);
ASAN_READ_RANGE(ctx, from, from_length + 1);
uptr to_length = internal_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 = internal_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 = internal_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 = internal_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 = internal_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 unreachable 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
// TODO: this should probably have an unversioned fallback for newer arches?
#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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