8d55d1872a
This patch adds support to load BTI-enabled objects.
According to the ABI, BTI is recorded in the .note.gnu.property section.
The new parser evaluates the property section, if exists.
It searches for .note section with NT_GNU_PROPERTY_TYPE_0.
Once found it tries to find GNU_PROPERTY_AARCH64_FEATURE_1_AND.
The results are cached.
The main change in linker is when protection of loaded ranges gets
applied. When BTI is requested and the platform also supports it
the prot flags have to be amended with PROT_BTI for executable ranges.
Failing to add PROT_BTI flag would disable BTI protection.
Moreover, adding the new PROT flag for shared objects without BTI
compatibility would break applications.
Kernel does not add PROT_BTI to a loaded ELF which has interpreter.
Linker handles this case too.
Test: 1. Flame boots
2. Tested on FVP with BTI enabled
Change-Id: Iafdf223b74c6e75d9f17ca90500e6fe42c4c1218
70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
/*
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* Copyright (C) 2016 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_globals.h"
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#include "linker_namespaces.h"
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#include "android-base/stringprintf.h"
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int g_argc = 0;
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char** g_argv = nullptr;
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char** g_envp = nullptr;
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android_namespace_t g_default_namespace;
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std::unordered_map<uintptr_t, soinfo*> g_soinfo_handles_map;
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platform_properties g_platform_properties;
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static char __linker_dl_err_buf[768];
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char* linker_get_error_buffer() {
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return &__linker_dl_err_buf[0];
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}
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size_t linker_get_error_buffer_size() {
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return sizeof(__linker_dl_err_buf);
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}
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void DL_WARN_documented_change(int api_level, const char* doc_fragment, const char* fmt, ...) {
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std::string result{"Warning: "};
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va_list ap;
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va_start(ap, fmt);
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android::base::StringAppendV(&result, fmt, ap);
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va_end(ap);
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android::base::StringAppendF(&result,
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" and will not work when the app moves to API level %d or later "
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"(%s#%s) (allowing for now because this app's target API level is "
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"still %d)",
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api_level, kBionicChangesUrl, doc_fragment,
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get_application_target_sdk_version());
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DL_WARN("%s", result.c_str());
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}
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