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 #ifndef __LINKER_NAMESPACES_H 30 #define __LINKER_NAMESPACES_H 31 32 #include "linker_common_types.h" 33 34 #include <string> 35 #include <vector> 36 #include <unordered_set> 37 38 struct android_namespace_t; 39 40 struct android_namespace_link_t { 41 public: 42 android_namespace_link_t(android_namespace_t* linked_namespace, 43 const std::unordered_set<std::string>& shared_lib_sonames) 44 : linked_namespace_(linked_namespace), shared_lib_sonames_(shared_lib_sonames) 45 {} 46 47 android_namespace_t* linked_namespace() const { 48 return linked_namespace_; 49 } 50 51 const std::unordered_set<std::string>& shared_lib_sonames() const { 52 return shared_lib_sonames_; 53 } 54 55 bool is_accessible(const char* soname) const { 56 return shared_lib_sonames_.find(soname) != shared_lib_sonames_.end(); 57 } 58 59 private: 60 android_namespace_t* const linked_namespace_; 61 const std::unordered_set<std::string> shared_lib_sonames_; 62 }; 63 64 struct android_namespace_t { 65 public: 66 android_namespace_t() : name_(nullptr), is_isolated_(false), is_greylist_enabled_(false) {} 67 68 const char* get_name() const { return name_; } 69 void set_name(const char* name) { name_ = name; } 70 71 bool is_isolated() const { return is_isolated_; } 72 void set_isolated(bool isolated) { is_isolated_ = isolated; } 73 74 bool is_greylist_enabled() const { return is_greylist_enabled_; } 75 void set_greylist_enabled(bool enabled) { is_greylist_enabled_ = enabled; } 76 77 const std::vector<std::string>& get_ld_library_paths() const { 78 return ld_library_paths_; 79 } 80 void set_ld_library_paths(std::vector<std::string>&& library_paths) { 81 ld_library_paths_ = library_paths; 82 } 83 84 const std::vector<std::string>& get_default_library_paths() const { 85 return default_library_paths_; 86 } 87 void set_default_library_paths(std::vector<std::string>&& library_paths) { 88 default_library_paths_ = library_paths; 89 } 90 void set_default_library_paths(const std::vector<std::string>& library_paths) { 91 default_library_paths_ = library_paths; 92 } 93 94 const std::vector<std::string>& get_permitted_paths() const { 95 return permitted_paths_; 96 } 97 void set_permitted_paths(std::vector<std::string>&& permitted_paths) { 98 permitted_paths_ = permitted_paths; 99 } 100 void set_permitted_paths(const std::vector<std::string>& permitted_paths) { 101 permitted_paths_ = permitted_paths; 102 } 103 104 const std::vector<android_namespace_link_t>& linked_namespaces() const { 105 return linked_namespaces_; 106 } 107 void add_linked_namespace(android_namespace_t* linked_namespace, 108 const std::unordered_set<std::string>& shared_lib_sonames) { 109 linked_namespaces_.push_back(android_namespace_link_t(linked_namespace, shared_lib_sonames)); 110 } 111 112 void add_soinfo(soinfo* si) { 113 soinfo_list_.push_back(si); 114 } 115 116 void add_soinfos(const soinfo_list_t& soinfos) { 117 for (auto si : soinfos) { 118 add_soinfo(si); 119 } 120 } 121 122 void remove_soinfo(soinfo* si) { 123 soinfo_list_.remove_if([&](soinfo* candidate) { 124 return si == candidate; 125 }); 126 } 127 128 const soinfo_list_t& soinfo_list() const { return soinfo_list_; } 129 130 // For isolated namespaces - checks if the file is on the search path; 131 // always returns true for not isolated namespace. 132 bool is_accessible(const std::string& path); 133 134 // Returns true if si is accessible from this namespace. A soinfo 135 // is considered accessible when it belongs to this namespace 136 // or one of it's parent soinfos belongs to this namespace. 137 bool is_accessible(soinfo* si); 138 139 private: 140 const char* name_; 141 bool is_isolated_; 142 bool is_greylist_enabled_; 143 std::vector<std::string> ld_library_paths_; 144 std::vector<std::string> default_library_paths_; 145 std::vector<std::string> permitted_paths_; 146 // Loader looks into linked namespace if it was not able 147 // to find a library in this namespace. Note that library 148 // lookup in linked namespaces are limited by the list of 149 // shared sonames. 150 std::vector<android_namespace_link_t> linked_namespaces_; 151 soinfo_list_t soinfo_list_; 152 153 DISALLOW_COPY_AND_ASSIGN(android_namespace_t); 154 }; 155 156 #endif /* __LINKER_NAMESPACES_H */ 157
