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
is_accessible(const std::string & file)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
is_accessible(soinfo * s)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