1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include "linker_namespaces.h" 30 #include "linker_globals.h" 31 #include "linker_soinfo.h" 32 #include "linker_utils.h" 33 34 bool android_namespace_t::is_accessible(const std::string& file) { 35 if (!is_isolated_) { 36 return true; 37 } 38 39 for (const auto& dir : ld_library_paths_) { 40 if (file_is_in_dir(file, dir)) { 41 return true; 42 } 43 } 44 45 for (const auto& dir : default_library_paths_) { 46 if (file_is_in_dir(file, dir)) { 47 return true; 48 } 49 } 50 51 for (const auto& dir : permitted_paths_) { 52 if (file_is_under_dir(file, dir)) { 53 return true; 54 } 55 } 56 57 return false; 58 } 59 60 bool android_namespace_t::is_accessible(soinfo* s) { 61 auto is_accessible_ftor = [this] (soinfo* si) { 62 // This is workaround for apps hacking into soinfo list. 63 // and inserting their own entries into it. (http://b/37191433) 64 if (!si->has_min_version(3)) { 65 DL_WARN("invalid soinfo version for \"%s\"", si->get_soname()); 66 return false; 67 } 68 69 if (si->get_primary_namespace() == this) { 70 return true; 71 } 72 73 const android_namespace_list_t& secondary_namespaces = si->get_secondary_namespaces(); 74 if (secondary_namespaces.find(this) != secondary_namespaces.end()) { 75 return true; 76 } 77 78 return false; 79 }; 80 81 if (is_accessible_ftor(s)) { 82 return true; 83 } 84 85 return !s->get_parents().visit([&](soinfo* si) { 86 return !is_accessible_ftor(si); 87 }); 88 } 89
