9076b0c4e7
Explicitly say "warning" for warnings, explicitly say what action we're going to take (such as "(ignoring)"), always provide a link to our documentation when there is one, explicitly say what API level the behavior changes at, and explicitly say why we're allowing the misbehavior for now. Bug: http://b/71852862 Test: ran tests, looked at logcat Change-Id: I1795a5af45deb904332b866d7d666690dae4340b
129 lines
3.9 KiB
C++
129 lines
3.9 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_namespaces.h"
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#include "linker_globals.h"
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#include "linker_soinfo.h"
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#include "linker_utils.h"
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#include <dlfcn.h>
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bool android_namespace_t::is_accessible(const std::string& file) {
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if (!is_isolated_) {
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return true;
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}
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for (const auto& dir : ld_library_paths_) {
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if (file_is_in_dir(file, dir)) {
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return true;
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}
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}
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for (const auto& dir : default_library_paths_) {
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if (file_is_in_dir(file, dir)) {
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return true;
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}
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}
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for (const auto& dir : permitted_paths_) {
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if (file_is_under_dir(file, dir)) {
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return true;
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}
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}
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return false;
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}
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bool android_namespace_t::is_accessible(soinfo* s) {
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auto is_accessible_ftor = [this] (soinfo* si) {
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// This is workaround for apps hacking into soinfo list.
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// and inserting their own entries into it. (http://b/37191433)
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if (!si->has_min_version(3)) {
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DL_WARN("Warning: invalid soinfo version for \"%s\" (assuming inaccessible)",
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si->get_soname());
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return false;
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}
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if (si->get_primary_namespace() == this) {
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return true;
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}
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const android_namespace_list_t& secondary_namespaces = si->get_secondary_namespaces();
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if (secondary_namespaces.find(this) != secondary_namespaces.end()) {
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return true;
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}
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return false;
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};
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if (is_accessible_ftor(s)) {
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return true;
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}
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return !s->get_parents().visit([&](soinfo* si) {
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return !is_accessible_ftor(si);
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});
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}
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// TODO: this is slightly unusual way to construct
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// the global group for relocation. Not every RTLD_GLOBAL
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// library is included in this group for backwards-compatibility
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// reasons.
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//
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// This group consists of the main executable, LD_PRELOADs
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// and libraries with the DF_1_GLOBAL flag set.
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soinfo_list_t android_namespace_t::get_global_group() {
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soinfo_list_t global_group;
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soinfo_list().for_each([&](soinfo* si) {
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if ((si->get_dt_flags_1() & DF_1_GLOBAL) != 0) {
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global_group.push_back(si);
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}
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});
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return global_group;
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}
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// This function provides a list of libraries to be shared
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// by the namespace. For the default namespace this is the global
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// group (see get_global_group). For all others this is a group
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// of RTLD_GLOBAL libraries (which includes the global group from
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// the default namespace).
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soinfo_list_t android_namespace_t::get_shared_group() {
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if (this == &g_default_namespace) {
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return get_global_group();
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}
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soinfo_list_t shared_group;
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soinfo_list().for_each([&](soinfo* si) {
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if ((si->get_rtld_flags() & RTLD_GLOBAL) != 0) {
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shared_group.push_back(si);
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}
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});
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return shared_group;
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}
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