abf736a780
Previously, the address of the global variable was communicated from the dynamic linker to libc.so using a field of KernelArgumentBlock, which is communicated using the TLS_SLOT_BIONIC_PREINIT slot. As long as this function isn't called during relocations (i.e. while executing an ifunc), it always return a non-NULL value. If it's called before its PLT entry is relocated, I expect a crash. I removed the __libc_init_shared_globals function. It's currently empty, and I don't think there's one point in libc's initialization where shared globals should be initialized. Bug: http://b/25751302 Test: bionic unit tests Change-Id: I614d25e7ef5e0d2ccc40d5c821dee10f1ec61c2e
72 lines
3.6 KiB
C++
72 lines
3.6 KiB
C++
/*
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* Copyright (C) 2018 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 <sys/cdefs.h>
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extern "C" void __internal_linker_error() {
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__builtin_trap();
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}
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__strong_alias(__loader_android_create_namespace, __internal_linker_error);
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__strong_alias(__loader_android_dlopen_ext, __internal_linker_error);
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__strong_alias(__loader_android_dlwarning, __internal_linker_error);
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__strong_alias(__loader_android_get_application_target_sdk_version, __internal_linker_error);
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__strong_alias(__loader_android_get_LD_LIBRARY_PATH, __internal_linker_error);
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__strong_alias(__loader_android_get_exported_namespace, __internal_linker_error);
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__strong_alias(__loader_android_init_anonymous_namespace, __internal_linker_error);
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__strong_alias(__loader_android_link_namespaces, __internal_linker_error);
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__strong_alias(__loader_android_link_namespaces_all_libs, __internal_linker_error);
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__strong_alias(__loader_android_set_application_target_sdk_version, __internal_linker_error);
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__strong_alias(__loader_android_update_LD_LIBRARY_PATH, __internal_linker_error);
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__strong_alias(__loader_cfi_fail, __internal_linker_error);
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__strong_alias(__loader_dl_iterate_phdr, __internal_linker_error);
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__strong_alias(__loader_dladdr, __internal_linker_error);
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__strong_alias(__loader_dlclose, __internal_linker_error);
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__strong_alias(__loader_dlerror, __internal_linker_error);
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__strong_alias(__loader_dlopen, __internal_linker_error);
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__strong_alias(__loader_dlsym, __internal_linker_error);
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__strong_alias(__loader_dlvsym, __internal_linker_error);
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__strong_alias(__loader_add_thread_local_dtor, __internal_linker_error);
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__strong_alias(__loader_remove_thread_local_dtor, __internal_linker_error);
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__strong_alias(__loader_shared_globals, __internal_linker_error);
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#if defined(__arm__)
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__strong_alias(__loader_dl_unwind_find_exidx, __internal_linker_error);
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#endif
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__strong_alias(rtld_db_dlactivity, __internal_linker_error);
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#if defined(__arm__)
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// An arm32 unwinding table has an R_ARM_NONE relocation to
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// __aeabi_unwind_cpp_pr0. This shared library will never invoke the unwinder,
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// so it doesn't actually need the routine. Define a dummy version here,
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// because the real version calls libc functions (e.g. memcpy, abort), which
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// would create a dependency cycle with libc.so.
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__attribute__((visibility("hidden")))
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extern "C" void __aeabi_unwind_cpp_pr0() {
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__builtin_trap();
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}
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#endif
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