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342 lines
14 KiB
342 lines
14 KiB
/*
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* Copyright (C) 2007 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "linker.h"
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#include "linker_cfi.h"
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#include "linker_globals.h"
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#include "linker_dlwarning.h"
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#include <link.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <android/api-level.h>
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#include <bionic/pthread_internal.h>
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#include "private/bionic_globals.h"
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#include "private/bionic_tls.h"
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#include "private/ScopedPthreadMutexLocker.h"
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#define __LINKER_PUBLIC__ __attribute__((visibility("default")))
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extern "C" {
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android_namespace_t* __loader_android_create_namespace(const char* name,
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const char* ld_library_path,
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const char* default_library_path,
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uint64_t type,
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const char* permitted_when_isolated_path,
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android_namespace_t* parent_namespace,
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const void* caller_addr) __LINKER_PUBLIC__;
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void* __loader_android_dlopen_ext(const char* filename,
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int flags,
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const android_dlextinfo* extinfo,
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const void* caller_addr) __LINKER_PUBLIC__;
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void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*)) __LINKER_PUBLIC__;
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int __loader_android_get_application_target_sdk_version() __LINKER_PUBLIC__;
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void __loader_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) __LINKER_PUBLIC__;
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android_namespace_t* __loader_android_get_exported_namespace(const char* name) __LINKER_PUBLIC__;
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bool __loader_android_init_anonymous_namespace(const char* shared_libs_sonames,
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const char* library_search_path) __LINKER_PUBLIC__;
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bool __loader_android_link_namespaces(android_namespace_t* namespace_from,
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android_namespace_t* namespace_to,
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const char* shared_libs_sonames) __LINKER_PUBLIC__;
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bool __loader_android_link_namespaces_all_libs(android_namespace_t* namespace_from,
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android_namespace_t* namespace_to) __LINKER_PUBLIC__;
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void __loader_android_set_application_target_sdk_version(int target) __LINKER_PUBLIC__;
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void __loader_android_update_LD_LIBRARY_PATH(const char* ld_library_path) __LINKER_PUBLIC__;
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void __loader_cfi_fail(uint64_t CallSiteTypeId,
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void* Ptr,
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void *DiagData,
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void *CallerPc) __LINKER_PUBLIC__;
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int __loader_dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data),
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void* data) __LINKER_PUBLIC__;
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int __loader_dladdr(const void* addr, Dl_info* info) __LINKER_PUBLIC__;
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int __loader_dlclose(void* handle) __LINKER_PUBLIC__;
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char* __loader_dlerror() __LINKER_PUBLIC__;
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void* __loader_dlopen(const char* filename, int flags, const void* caller_addr) __LINKER_PUBLIC__;
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void* __loader_dlsym(void* handle, const char* symbol, const void* caller_addr) __LINKER_PUBLIC__;
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void* __loader_dlvsym(void* handle,
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const char* symbol,
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const char* version,
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const void* caller_addr) __LINKER_PUBLIC__;
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void __loader_add_thread_local_dtor(void* dso_handle) __LINKER_PUBLIC__;
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void __loader_remove_thread_local_dtor(void* dso_handle) __LINKER_PUBLIC__;
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libc_shared_globals* __loader_shared_globals() __LINKER_PUBLIC__;
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#if defined(__arm__)
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_Unwind_Ptr __loader_dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) __LINKER_PUBLIC__;
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#endif
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}
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static pthread_mutex_t g_dl_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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static char* __bionic_set_dlerror(char* new_value) {
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char* old_value = __get_thread()->current_dlerror;
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__get_thread()->current_dlerror = new_value;
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if (new_value != nullptr) LD_LOG(kLogErrors, "dlerror set to \"%s\"", new_value);
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return old_value;
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}
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static void __bionic_format_dlerror(const char* msg, const char* detail) {
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char* buffer = __get_thread()->dlerror_buffer;
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strlcpy(buffer, msg, __BIONIC_DLERROR_BUFFER_SIZE);
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if (detail != nullptr) {
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strlcat(buffer, ": ", __BIONIC_DLERROR_BUFFER_SIZE);
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strlcat(buffer, detail, __BIONIC_DLERROR_BUFFER_SIZE);
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}
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__bionic_set_dlerror(buffer);
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}
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char* __loader_dlerror() {
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char* old_value = __bionic_set_dlerror(nullptr);
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return old_value;
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}
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void __loader_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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do_android_get_LD_LIBRARY_PATH(buffer, buffer_size);
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}
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void __loader_android_update_LD_LIBRARY_PATH(const char* ld_library_path) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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do_android_update_LD_LIBRARY_PATH(ld_library_path);
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}
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static void* dlopen_ext(const char* filename,
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int flags,
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const android_dlextinfo* extinfo,
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const void* caller_addr) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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g_linker_logger.ResetState();
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void* result = do_dlopen(filename, flags, extinfo, caller_addr);
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if (result == nullptr) {
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__bionic_format_dlerror("dlopen failed", linker_get_error_buffer());
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return nullptr;
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}
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return result;
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}
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void* __loader_android_dlopen_ext(const char* filename,
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int flags,
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const android_dlextinfo* extinfo,
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const void* caller_addr) {
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return dlopen_ext(filename, flags, extinfo, caller_addr);
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}
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void* __loader_dlopen(const char* filename, int flags, const void* caller_addr) {
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return dlopen_ext(filename, flags, nullptr, caller_addr);
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}
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void* dlsym_impl(void* handle, const char* symbol, const char* version, const void* caller_addr) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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g_linker_logger.ResetState();
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void* result;
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if (!do_dlsym(handle, symbol, version, caller_addr, &result)) {
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__bionic_format_dlerror(linker_get_error_buffer(), nullptr);
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return nullptr;
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}
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return result;
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}
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void* __loader_dlsym(void* handle, const char* symbol, const void* caller_addr) {
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return dlsym_impl(handle, symbol, nullptr, caller_addr);
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}
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void* __loader_dlvsym(void* handle, const char* symbol, const char* version, const void* caller_addr) {
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return dlsym_impl(handle, symbol, version, caller_addr);
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}
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int __loader_dladdr(const void* addr, Dl_info* info) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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return do_dladdr(addr, info);
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}
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int __loader_dlclose(void* handle) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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int result = do_dlclose(handle);
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if (result != 0) {
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__bionic_format_dlerror("dlclose failed", linker_get_error_buffer());
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}
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return result;
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}
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int __loader_dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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return do_dl_iterate_phdr(cb, data);
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}
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#if defined(__arm__)
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_Unwind_Ptr __loader_dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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return do_dl_unwind_find_exidx(pc, pcount);
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}
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#endif
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void __loader_android_set_application_target_sdk_version(int target) {
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// lock to avoid modification in the middle of dlopen.
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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set_application_target_sdk_version(target);
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}
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int __loader_android_get_application_target_sdk_version() {
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return get_application_target_sdk_version();
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}
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void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*)) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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get_dlwarning(obj, f);
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}
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bool __loader_android_init_anonymous_namespace(const char* shared_libs_sonames,
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const char* library_search_path) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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bool success = init_anonymous_namespace(shared_libs_sonames, library_search_path);
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if (!success) {
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__bionic_format_dlerror("android_init_anonymous_namespace failed", linker_get_error_buffer());
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}
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return success;
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}
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android_namespace_t* __loader_android_create_namespace(const char* name,
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const char* ld_library_path,
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const char* default_library_path,
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uint64_t type,
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const char* permitted_when_isolated_path,
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android_namespace_t* parent_namespace,
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const void* caller_addr) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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android_namespace_t* result = create_namespace(caller_addr,
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name,
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ld_library_path,
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default_library_path,
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type,
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permitted_when_isolated_path,
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parent_namespace);
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if (result == nullptr) {
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__bionic_format_dlerror("android_create_namespace failed", linker_get_error_buffer());
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}
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return result;
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}
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bool __loader_android_link_namespaces(android_namespace_t* namespace_from,
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android_namespace_t* namespace_to,
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const char* shared_libs_sonames) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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bool success = link_namespaces(namespace_from, namespace_to, shared_libs_sonames);
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if (!success) {
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__bionic_format_dlerror("android_link_namespaces failed", linker_get_error_buffer());
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}
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return success;
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}
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bool __loader_android_link_namespaces_all_libs(android_namespace_t* namespace_from,
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android_namespace_t* namespace_to) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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bool success = link_namespaces_all_libs(namespace_from, namespace_to);
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if (!success) {
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__bionic_format_dlerror("android_link_namespaces_all_libs failed", linker_get_error_buffer());
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}
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return success;
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}
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android_namespace_t* __loader_android_get_exported_namespace(const char* name) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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return get_exported_namespace(name);
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}
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void __loader_cfi_fail(uint64_t CallSiteTypeId, void* Ptr, void *DiagData, void *CallerPc) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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CFIShadowWriter::CfiFail(CallSiteTypeId, Ptr, DiagData, CallerPc);
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}
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void __loader_add_thread_local_dtor(void* dso_handle) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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increment_dso_handle_reference_counter(dso_handle);
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}
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void __loader_remove_thread_local_dtor(void* dso_handle) {
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ScopedPthreadMutexLocker locker(&g_dl_mutex);
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decrement_dso_handle_reference_counter(dso_handle);
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}
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libc_shared_globals* __loader_shared_globals() {
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return __libc_shared_globals();
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}
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static uint8_t __libdl_info_buf[sizeof(soinfo)] __attribute__((aligned(8)));
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static soinfo* __libdl_info = nullptr;
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// This is used by the dynamic linker. Every process gets these symbols for free.
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soinfo* get_libdl_info(const soinfo& linker_si) {
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CHECK((linker_si.flags_ & FLAG_GNU_HASH) != 0);
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if (__libdl_info == nullptr) {
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__libdl_info = new (__libdl_info_buf) soinfo(&g_default_namespace, nullptr, nullptr, 0, 0);
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__libdl_info->flags_ |= (FLAG_LINKED | FLAG_GNU_HASH);
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__libdl_info->strtab_ = linker_si.strtab_;
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__libdl_info->symtab_ = linker_si.symtab_;
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__libdl_info->load_bias = linker_si.load_bias;
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__libdl_info->phdr = linker_si.phdr;
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__libdl_info->phnum = linker_si.phnum;
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__libdl_info->gnu_nbucket_ = linker_si.gnu_nbucket_;
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__libdl_info->gnu_maskwords_ = linker_si.gnu_maskwords_;
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__libdl_info->gnu_shift2_ = linker_si.gnu_shift2_;
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__libdl_info->gnu_bloom_filter_ = linker_si.gnu_bloom_filter_;
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__libdl_info->gnu_bucket_ = linker_si.gnu_bucket_;
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__libdl_info->gnu_chain_ = linker_si.gnu_chain_;
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__libdl_info->ref_count_ = 1;
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__libdl_info->strtab_size_ = linker_si.strtab_size_;
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__libdl_info->local_group_root_ = __libdl_info;
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__libdl_info->soname_ = linker_si.soname_;
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__libdl_info->target_sdk_version_ = __ANDROID_API__;
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__libdl_info->generate_handle();
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#if defined(__work_around_b_24465209__)
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strlcpy(__libdl_info->old_name_, __libdl_info->soname_.c_str(),
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sizeof(__libdl_info->old_name_));
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#endif
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}
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return __libdl_info;
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}
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