Viewing file:  lsan_interceptors.cpp (16.68 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
//=-- lsan_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 LeakSanitizer.
// Interceptors for standalone LSan.
//
//===----------------------------------------------------------------------===//
#include "interception/interception.h"
#include "sanitizer_common/sanitizer_allocator.h"
#include "sanitizer_common/sanitizer_allocator_dlsym.h"
#include "sanitizer_common/sanitizer_allocator_report.h"
#include "sanitizer_common/sanitizer_atomic.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_flags.h"
#include "sanitizer_common/sanitizer_internal_defs.h"
#include "sanitizer_common/sanitizer_linux.h"
#include "sanitizer_common/sanitizer_platform_interceptors.h"
#include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
#include "sanitizer_common/sanitizer_platform_limits_posix.h"
#if SANITIZER_POSIX
#include "sanitizer_common/sanitizer_posix.h"
#endif
#include "sanitizer_common/sanitizer_tls_get_addr.h"
#include "lsan.h"
#include "lsan_allocator.h"
#include "lsan_common.h"
#include "lsan_thread.h"
#include <stddef.h>
using namespace __lsan;
extern "C" {
int pthread_attr_init(void *attr);
int pthread_attr_destroy(void *attr);
int pthread_attr_getdetachstate(void *attr, int *v);
int pthread_key_create(unsigned *key, void (*destructor)(void* v));
int pthread_setspecific(unsigned key, const void *v);
}
struct DlsymAlloc : DlSymAllocator<DlsymAlloc> {
static bool UseImpl() { return lsan_init_is_running; }
static void OnAllocate(const void *ptr, uptr size) {
#if CAN_SANITIZE_LEAKS
// Suppress leaks from dlerror(). Previously dlsym hack on global array was
// used by leak sanitizer as a root region.
__lsan_register_root_region(ptr, size);
#endif
}
static void OnFree(const void *ptr, uptr size) {
#if CAN_SANITIZE_LEAKS
__lsan_unregister_root_region(ptr, size);
#endif
}
};
///// Malloc/free interceptors. /////
namespace std {
struct nothrow_t;
enum class align_val_t: size_t;
}
#if !SANITIZER_MAC
INTERCEPTOR(void*, malloc, uptr size) {
if (DlsymAlloc::Use())
return DlsymAlloc::Allocate(size);
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_malloc(size, stack);
}
INTERCEPTOR(void, free, void *p) {
if (DlsymAlloc::PointerIsMine(p))
return DlsymAlloc::Free(p);
ENSURE_LSAN_INITED;
lsan_free(p);
}
INTERCEPTOR(void*, calloc, uptr nmemb, uptr size) {
if (DlsymAlloc::Use())
return DlsymAlloc::Callocate(nmemb, size);
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_calloc(nmemb, size, stack);
}
INTERCEPTOR(void *, realloc, void *ptr, uptr size) {
if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr))
return DlsymAlloc::Realloc(ptr, size);
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_realloc(ptr, size, stack);
}
INTERCEPTOR(void*, reallocarray, void *q, uptr nmemb, uptr size) {
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_reallocarray(q, nmemb, size, stack);
}
INTERCEPTOR(int, posix_memalign, void **memptr, uptr alignment, uptr size) {
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_posix_memalign(memptr, alignment, size, stack);
}
INTERCEPTOR(void*, valloc, uptr size) {
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_valloc(size, stack);
}
#endif // !SANITIZER_MAC
#if SANITIZER_INTERCEPT_MEMALIGN
INTERCEPTOR(void*, memalign, uptr alignment, uptr size) {
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_memalign(alignment, size, stack);
}
#define LSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
#else
#define LSAN_MAYBE_INTERCEPT_MEMALIGN
#endif // SANITIZER_INTERCEPT_MEMALIGN
#if SANITIZER_INTERCEPT___LIBC_MEMALIGN
INTERCEPTOR(void *, __libc_memalign, uptr alignment, uptr size) {
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
void *res = lsan_memalign(alignment, size, stack);
DTLS_on_libc_memalign(res, size);
return res;
}
#define LSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN INTERCEPT_FUNCTION(__libc_memalign)
#else
#define LSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN
#endif // SANITIZER_INTERCEPT___LIBC_MEMALIGN
#if SANITIZER_INTERCEPT_ALIGNED_ALLOC
INTERCEPTOR(void*, aligned_alloc, uptr alignment, uptr size) {
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_aligned_alloc(alignment, size, stack);
}
#define LSAN_MAYBE_INTERCEPT_ALIGNED_ALLOC INTERCEPT_FUNCTION(aligned_alloc)
#else
#define LSAN_MAYBE_INTERCEPT_ALIGNED_ALLOC
#endif
#if SANITIZER_INTERCEPT_MALLOC_USABLE_SIZE
INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
ENSURE_LSAN_INITED;
return GetMallocUsableSize(ptr);
}
#define LSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE \
INTERCEPT_FUNCTION(malloc_usable_size)
#else
#define LSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE
#endif
#if SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
struct fake_mallinfo {
int x[10];
};
INTERCEPTOR(struct fake_mallinfo, mallinfo, void) {
struct fake_mallinfo res;
internal_memset(&res, 0, sizeof(res));
return res;
}
#define LSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
INTERCEPTOR(int, mallopt, int cmd, int value) {
return 0;
}
#define LSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
#else
#define LSAN_MAYBE_INTERCEPT_MALLINFO
#define LSAN_MAYBE_INTERCEPT_MALLOPT
#endif // SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
#if SANITIZER_INTERCEPT_PVALLOC
INTERCEPTOR(void*, pvalloc, uptr size) {
ENSURE_LSAN_INITED;
GET_STACK_TRACE_MALLOC;
return lsan_pvalloc(size, stack);
}
#define LSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
#else
#define LSAN_MAYBE_INTERCEPT_PVALLOC
#endif // SANITIZER_INTERCEPT_PVALLOC
#if SANITIZER_INTERCEPT_CFREE
INTERCEPTOR(void, cfree, void *p) ALIAS(WRAPPER_NAME(free));
#define LSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
#else
#define LSAN_MAYBE_INTERCEPT_CFREE
#endif // SANITIZER_INTERCEPT_CFREE
#if SANITIZER_INTERCEPT_MCHECK_MPROBE
INTERCEPTOR(int, mcheck, void (*abortfunc)(int mstatus)) {
return 0;
}
INTERCEPTOR(int, mcheck_pedantic, void (*abortfunc)(int mstatus)) {
return 0;
}
INTERCEPTOR(int, mprobe, void *ptr) {
return 0;
}
#endif // SANITIZER_INTERCEPT_MCHECK_MPROBE
// TODO(alekseys): throw std::bad_alloc instead of dying on OOM.
#define OPERATOR_NEW_BODY(nothrow)\
ENSURE_LSAN_INITED;\
GET_STACK_TRACE_MALLOC;\
void *res = lsan_malloc(size, stack);\
if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
return res;
#define OPERATOR_NEW_BODY_ALIGN(nothrow)\
ENSURE_LSAN_INITED;\
GET_STACK_TRACE_MALLOC;\
void *res = lsan_memalign((uptr)align, size, stack);\
if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
return res;
#define OPERATOR_DELETE_BODY\
ENSURE_LSAN_INITED;\
lsan_free(ptr);
// On OS X it's not enough to just provide our own 'operator new' and
// 'operator delete' implementations, because they're going to be in the runtime
// dylib, and the main executable will depend on both the runtime dylib and
// libstdc++, each of has its implementation of new and delete.
// To make sure that C++ allocation/deallocation operators are overridden on
// OS X we need to intercept them using their mangled names.
#if !SANITIZER_MAC
INTERCEPTOR_ATTRIBUTE
void *operator new(size_t size) { OPERATOR_NEW_BODY(false /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE
void *operator new[](size_t size) { OPERATOR_NEW_BODY(false /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE
void *operator new(size_t size, std::nothrow_t const&)
{ OPERATOR_NEW_BODY(true /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE
void *operator new[](size_t size, std::nothrow_t const&)
{ OPERATOR_NEW_BODY(true /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE
void *operator new(size_t size, std::align_val_t align)
{ OPERATOR_NEW_BODY_ALIGN(false /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE
void *operator new[](size_t size, std::align_val_t align)
{ OPERATOR_NEW_BODY_ALIGN(false /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE
void *operator new(size_t size, std::align_val_t align, std::nothrow_t const&)
{ OPERATOR_NEW_BODY_ALIGN(true /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE
void *operator new[](size_t size, std::align_val_t align, std::nothrow_t const&)
{ OPERATOR_NEW_BODY_ALIGN(true /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE
void operator delete(void *ptr) NOEXCEPT { OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete[](void *ptr) NOEXCEPT { OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete(void *ptr, std::nothrow_t const&) { OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete[](void *ptr, std::nothrow_t const &)
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete(void *ptr, size_t size) NOEXCEPT
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete[](void *ptr, size_t size) NOEXCEPT
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete(void *ptr, std::align_val_t) NOEXCEPT
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete[](void *ptr, std::align_val_t) NOEXCEPT
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete(void *ptr, std::align_val_t, std::nothrow_t const&)
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete[](void *ptr, std::align_val_t, std::nothrow_t const&)
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete(void *ptr, size_t size, std::align_val_t) NOEXCEPT
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR_ATTRIBUTE
void operator delete[](void *ptr, size_t size, std::align_val_t) NOEXCEPT
{ OPERATOR_DELETE_BODY; }
#else // SANITIZER_MAC
INTERCEPTOR(void *, _Znwm, size_t size)
{ OPERATOR_NEW_BODY(false /*nothrow*/); }
INTERCEPTOR(void *, _Znam, size_t size)
{ OPERATOR_NEW_BODY(false /*nothrow*/); }
INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t, size_t size, std::nothrow_t const&)
{ OPERATOR_NEW_BODY(true /*nothrow*/); }
INTERCEPTOR(void *, _ZnamRKSt9nothrow_t, size_t size, std::nothrow_t const&)
{ OPERATOR_NEW_BODY(true /*nothrow*/); }
INTERCEPTOR(void, _ZdlPv, void *ptr)
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR(void, _ZdaPv, void *ptr)
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&)
{ OPERATOR_DELETE_BODY; }
INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t, void *ptr, std::nothrow_t const&)
{ OPERATOR_DELETE_BODY; }
#endif // !SANITIZER_MAC
///// Thread initialization and finalization. /////
#if !SANITIZER_NETBSD && !SANITIZER_FREEBSD && !SANITIZER_FUCHSIA
static unsigned g_thread_finalize_key;
static void thread_finalize(void *v) {
uptr iter = (uptr)v;
if (iter > 1) {
if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
Report("LeakSanitizer: failed to set thread key.\n");
Die();
}
return;
}
ThreadFinish();
}
#endif
#if SANITIZER_NETBSD
INTERCEPTOR(void, _lwp_exit) {
ENSURE_LSAN_INITED;
ThreadFinish();
REAL(_lwp_exit)();
}
#define LSAN_MAYBE_INTERCEPT__LWP_EXIT INTERCEPT_FUNCTION(_lwp_exit)
#else
#define LSAN_MAYBE_INTERCEPT__LWP_EXIT
#endif
#if SANITIZER_INTERCEPT_THR_EXIT
INTERCEPTOR(void, thr_exit, tid_t *state) {
ENSURE_LSAN_INITED;
ThreadFinish();
REAL(thr_exit)(state);
}
#define LSAN_MAYBE_INTERCEPT_THR_EXIT INTERCEPT_FUNCTION(thr_exit)
#else
#define LSAN_MAYBE_INTERCEPT_THR_EXIT
#endif
#if SANITIZER_INTERCEPT___CXA_ATEXIT
INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
void *dso_handle) {
__lsan::ScopedInterceptorDisabler disabler;
return REAL(__cxa_atexit)(func, arg, dso_handle);
}
#define LSAN_MAYBE_INTERCEPT___CXA_ATEXIT INTERCEPT_FUNCTION(__cxa_atexit)
#else
#define LSAN_MAYBE_INTERCEPT___CXA_ATEXIT
#endif
#if SANITIZER_INTERCEPT_ATEXIT
INTERCEPTOR(int, atexit, void (*f)()) {
__lsan::ScopedInterceptorDisabler disabler;
return REAL(__cxa_atexit)((void (*)(void *a))f, 0, 0);
}
#define LSAN_MAYBE_INTERCEPT_ATEXIT INTERCEPT_FUNCTION(atexit)
#else
#define LSAN_MAYBE_INTERCEPT_ATEXIT
#endif
#if SANITIZER_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)()) {
__lsan::ScopedInterceptorDisabler disabler;
// REAL(pthread_atfork) cannot be called due to symbol indirections at least
// on NetBSD
return _pthread_atfork(prepare, parent, child);
}
#define LSAN_MAYBE_INTERCEPT_PTHREAD_ATFORK INTERCEPT_FUNCTION(pthread_atfork)
#else
#define LSAN_MAYBE_INTERCEPT_PTHREAD_ATFORK
#endif
#if SANITIZER_INTERCEPT_STRERROR
INTERCEPTOR(char *, strerror, int errnum) {
__lsan::ScopedInterceptorDisabler disabler;
return REAL(strerror)(errnum);
}
#define LSAN_MAYBE_INTERCEPT_STRERROR INTERCEPT_FUNCTION(strerror)
#else
#define LSAN_MAYBE_INTERCEPT_STRERROR
#endif
#if SANITIZER_POSIX
struct ThreadParam {
void *(*callback)(void *arg);
void *param;
atomic_uintptr_t tid;
};
extern "C" void *__lsan_thread_start_func(void *arg) {
ThreadParam *p = (ThreadParam*)arg;
void* (*callback)(void *arg) = p->callback;
void *param = p->param;
// Wait until the last iteration to maximize the chance that we are the last
// destructor to run.
#if !SANITIZER_NETBSD && !SANITIZER_FREEBSD
if (pthread_setspecific(g_thread_finalize_key,
(void*)GetPthreadDestructorIterations())) {
Report("LeakSanitizer: failed to set thread key.\n");
Die();
}
#endif
int tid = 0;
while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
internal_sched_yield();
ThreadStart(tid, GetTid());
atomic_store(&p->tid, 0, memory_order_release);
return callback(param);
}
INTERCEPTOR(int, pthread_create, void *th, void *attr,
void *(*callback)(void *), void *param) {
ENSURE_LSAN_INITED;
EnsureMainThreadIDIsCorrect();
__sanitizer_pthread_attr_t myattr;
if (!attr) {
pthread_attr_init(&myattr);
attr = &myattr;
}
AdjustStackSize(attr);
int detached = 0;
pthread_attr_getdetachstate(attr, &detached);
ThreadParam p;
p.callback = callback;
p.param = param;
atomic_store(&p.tid, 0, memory_order_relaxed);
int res;
{
// 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.
ScopedInterceptorDisabler disabler;
res = REAL(pthread_create)(th, attr, __lsan_thread_start_func, &p);
}
if (res == 0) {
int tid = ThreadCreate(GetCurrentThread(), *(uptr *)th,
IsStateDetached(detached));
CHECK_NE(tid, kMainTid);
atomic_store(&p.tid, tid, memory_order_release);
while (atomic_load(&p.tid, memory_order_acquire) != 0)
internal_sched_yield();
}
if (attr == &myattr)
pthread_attr_destroy(&myattr);
return res;
}
INTERCEPTOR(int, pthread_join, void *th, void **ret) {
ENSURE_LSAN_INITED;
int tid = ThreadTid((uptr)th);
int res = REAL(pthread_join)(th, ret);
if (res == 0)
ThreadJoin(tid);
return res;
}
INTERCEPTOR(int, pthread_detach, void *th) {
ENSURE_LSAN_INITED;
int tid = ThreadTid((uptr)th);
int res = REAL(pthread_detach)(th);
if (res == 0)
ThreadDetach(tid);
return res;
}
INTERCEPTOR(void, _exit, int status) {
if (status == 0 && HasReportedLeaks()) status = common_flags()->exitcode;
REAL(_exit)(status);
}
#define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
#include "sanitizer_common/sanitizer_signal_interceptors.inc"
#endif // SANITIZER_POSIX
namespace __lsan {
void InitializeInterceptors() {
// Fuchsia doesn't use interceptors that require any setup.
#if !SANITIZER_FUCHSIA
InitializeSignalInterceptors();
INTERCEPT_FUNCTION(malloc);
INTERCEPT_FUNCTION(free);
LSAN_MAYBE_INTERCEPT_CFREE;
INTERCEPT_FUNCTION(calloc);
INTERCEPT_FUNCTION(realloc);
LSAN_MAYBE_INTERCEPT_MEMALIGN;
LSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN;
LSAN_MAYBE_INTERCEPT_ALIGNED_ALLOC;
INTERCEPT_FUNCTION(posix_memalign);
INTERCEPT_FUNCTION(valloc);
LSAN_MAYBE_INTERCEPT_PVALLOC;
LSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE;
LSAN_MAYBE_INTERCEPT_MALLINFO;
LSAN_MAYBE_INTERCEPT_MALLOPT;
INTERCEPT_FUNCTION(pthread_create);
INTERCEPT_FUNCTION(pthread_detach);
INTERCEPT_FUNCTION(pthread_join);
INTERCEPT_FUNCTION(_exit);
LSAN_MAYBE_INTERCEPT__LWP_EXIT;
LSAN_MAYBE_INTERCEPT_THR_EXIT;
LSAN_MAYBE_INTERCEPT___CXA_ATEXIT;
LSAN_MAYBE_INTERCEPT_ATEXIT;
LSAN_MAYBE_INTERCEPT_PTHREAD_ATFORK;
LSAN_MAYBE_INTERCEPT_STRERROR;
#if !SANITIZER_NETBSD && !SANITIZER_FREEBSD
if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
Report("LeakSanitizer: failed to create thread key.\n");
Die();
}
#endif
#endif // !SANITIZER_FUCHSIA
}
} // namespace __lsan
|
