| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include "linker_namespaces.h" |
| #include "linker_globals.h" |
| #include "linker_soinfo.h" |
| #include "linker_utils.h" |
| |
| #include <dlfcn.h> |
| |
| bool android_namespace_t::is_accessible(const std::string& file) { |
| if (!is_isolated_) { |
| return true; |
| } |
| |
| for (const auto& dir : ld_library_paths_) { |
| if (file_is_in_dir(file, dir)) { |
| return true; |
| } |
| } |
| |
| for (const auto& dir : default_library_paths_) { |
| if (file_is_in_dir(file, dir)) { |
| return true; |
| } |
| } |
| |
| for (const auto& dir : permitted_paths_) { |
| if (file_is_under_dir(file, dir)) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| bool android_namespace_t::is_accessible(soinfo* s) { |
| auto is_accessible_ftor = [this] (soinfo* si) { |
| // This is workaround for apps hacking into soinfo list. |
| // and inserting their own entries into it. (http://b/37191433) |
| if (!si->has_min_version(3)) { |
| DL_WARN("Warning: invalid soinfo version for \"%s\" (assuming inaccessible)", |
| si->get_soname()); |
| return false; |
| } |
| |
| if (si->get_primary_namespace() == this) { |
| return true; |
| } |
| |
| const android_namespace_list_t& secondary_namespaces = si->get_secondary_namespaces(); |
| if (secondary_namespaces.find(this) != secondary_namespaces.end()) { |
| return true; |
| } |
| |
| return false; |
| }; |
| |
| if (is_accessible_ftor(s)) { |
| return true; |
| } |
| |
| return !s->get_parents().visit([&](soinfo* si) { |
| return !is_accessible_ftor(si); |
| }); |
| } |
| |
| // TODO: this is slightly unusual way to construct |
| // the global group for relocation. Not every RTLD_GLOBAL |
| // library is included in this group for backwards-compatibility |
| // reasons. |
| // |
| // This group consists of the main executable, LD_PRELOADs |
| // and libraries with the DF_1_GLOBAL flag set. |
| soinfo_list_t android_namespace_t::get_global_group() { |
| soinfo_list_t global_group; |
| soinfo_list().for_each([&](soinfo* si) { |
| if ((si->get_dt_flags_1() & DF_1_GLOBAL) != 0) { |
| global_group.push_back(si); |
| } |
| }); |
| |
| return global_group; |
| } |
| |
| // This function provides a list of libraries to be shared |
| // by the namespace. For the default namespace this is the global |
| // group (see get_global_group). For all others this is a group |
| // of RTLD_GLOBAL libraries (which includes the global group from |
| // the default namespace). |
| soinfo_list_t android_namespace_t::get_shared_group() { |
| if (this == &g_default_namespace) { |
| return get_global_group(); |
| } |
| |
| soinfo_list_t shared_group; |
| soinfo_list().for_each([&](soinfo* si) { |
| if ((si->get_rtld_flags() & RTLD_GLOBAL) != 0) { |
| shared_group.push_back(si); |
| } |
| }); |
| |
| return shared_group; |
| } |