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1 /*
2  * Copyright (C) 2020 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.h"
30 #include "linker_translate_path.h"
31 #include "linker_utils.h"
32 
33 #if defined(__LP64__)
34 #define APEX_LIB(apex, name) \
35   { "/system/lib64/" name, "/apex/" apex "/lib64/" name }
36 #else
37 #define APEX_LIB(apex, name) \
38   { "/system/lib/" name, "/apex/" apex "/lib/" name }
39 #endif
40 
41 
42 // Workaround for dlopen(/system/lib(64)/<soname>) when .so is in /apex. http://b/121248172
43 /**
44  * Translate /system path to /apex path if needed
45  * The workaround should work only when targetSdkVersion < Q.
46  *
47  * param out_name_to_apex pointing to /apex path
48  * return true if translation is needed
49  */
translateSystemPathToApexPath(const char * name,std::string * out_name_to_apex)50 bool translateSystemPathToApexPath(const char* name, std::string* out_name_to_apex) {
51   static constexpr const char* kPathTranslationQ[][2] = {
52       APEX_LIB("com.android.i18n", "libicui18n.so"),
53       APEX_LIB("com.android.i18n", "libicuuc.so")
54   };
55 
56   if (name == nullptr) {
57     return false;
58   }
59 
60   auto comparator = [name](auto p) { return strcmp(name, p[0]) == 0; };
61 
62   if (get_application_target_sdk_version() < __ANDROID_API_Q__) {
63     if (auto it =
64             std::find_if(std::begin(kPathTranslationQ), std::end(kPathTranslationQ), comparator);
65         it != std::end(kPathTranslationQ)) {
66       *out_name_to_apex = (*it)[1];
67       return true;
68     }
69   }
70 
71   return false;
72 }
73 // End Workaround for dlopen(/system/lib/<soname>) when .so is in /apex.
74