forked from OSchip/llvm-project
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
//===-- sanitizer_win_weak_interception.cpp -------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// This module should be included in the sanitizer when it is implemented as a
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// shared library on Windows (dll), in order to delegate the calls of weak
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// functions to the implementation in the main executable when a strong
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// definition is provided.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_WINDOWS && SANITIZER_DYNAMIC
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#include "sanitizer_win_weak_interception.h"
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#include "sanitizer_allocator_interface.h"
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#include "sanitizer_interface_internal.h"
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#include "sanitizer_win_defs.h"
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#include "interception/interception.h"
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extern "C" {
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void *WINAPI GetModuleHandleA(const char *module_name);
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void abort();
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}
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namespace __sanitizer {
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// Try to get a pointer to real_function in the main module and override
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// dll_function with that pointer. If the function isn't found, nothing changes.
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int interceptWhenPossible(uptr dll_function, const char *real_function) {
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uptr real = __interception::InternalGetProcAddress(
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(void *)GetModuleHandleA(0), real_function);
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if (real && !__interception::OverrideFunction((uptr)dll_function, real, 0))
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abort();
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return 0;
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}
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} // namespace __sanitizer
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// Declare weak hooks.
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extern "C" {
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void __sanitizer_on_print(const char *str);
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void __sanitizer_weak_hook_memcmp(uptr called_pc, const void *s1,
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const void *s2, uptr n, int result);
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void __sanitizer_weak_hook_strcmp(uptr called_pc, const char *s1,
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const char *s2, int result);
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void __sanitizer_weak_hook_strncmp(uptr called_pc, const char *s1,
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const char *s2, uptr n, int result);
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void __sanitizer_weak_hook_strstr(uptr called_pc, const char *s1,
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const char *s2, char *result);
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}
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// Include Sanitizer Common interface.
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#define INTERFACE_FUNCTION(Name)
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#define INTERFACE_WEAK_FUNCTION(Name) INTERCEPT_SANITIZER_WEAK_FUNCTION(Name)
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#include "sanitizer_common_interface.inc"
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#pragma section(".WEAK$A", read)
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#pragma section(".WEAK$Z", read)
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typedef void (*InterceptCB)();
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extern "C" {
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__declspec(allocate(".WEAK$A")) InterceptCB __start_weak_list;
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__declspec(allocate(".WEAK$Z")) InterceptCB __stop_weak_list;
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}
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static int weak_intercept_init() {
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static bool flag = false;
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// weak_interception_init is expected to be called by only one thread.
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if (flag) return 0;
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flag = true;
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for (InterceptCB *it = &__start_weak_list; it < &__stop_weak_list; ++it)
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if (*it)
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(*it)();
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// In DLLs, the callbacks are expected to return 0,
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// otherwise CRT initialization fails.
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return 0;
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}
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#pragma section(".CRT$XIB", long, read)
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__declspec(allocate(".CRT$XIB")) int (*__weak_intercept_preinit)() =
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weak_intercept_init;
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static void WINAPI weak_intercept_thread_init(void *mod, unsigned long reason,
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void *reserved) {
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if (reason == /*DLL_PROCESS_ATTACH=*/1) weak_intercept_init();
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}
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#pragma section(".CRT$XLAB", long, read)
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__declspec(allocate(".CRT$XLAB")) void(WINAPI *__weak_intercept_tls_init)(
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void *, unsigned long, void *) = weak_intercept_thread_init;
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#endif // SANITIZER_WINDOWS && SANITIZER_DYNAMIC
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