1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /* 18 * Tests accessibility of platform native libraries 19 */ 20 21 #include <dlfcn.h> 22 #include <errno.h> 23 #include <jni.h> 24 #include <libgen.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <sys/mman.h> 28 #include <sys/types.h> 29 #include <sys/stat.h> 30 #include <unistd.h> 31 32 #include <string> 33 34 #include "nativehelper/scoped_local_ref.h" 35 #include "nativehelper/scoped_utf_chars.h" 36 37 static constexpr const char* kTestLibName = "libjni_test_dlclose.so"; 38 run_test(std::string * error_msg)39static bool run_test(std::string* error_msg) { 40 void* handle = dlopen(kTestLibName, RTLD_NOW); 41 if (handle == nullptr) { 42 *error_msg = dlerror(); 43 return false; 44 } 45 46 void* taxicab_number = dlsym(handle, "dlopen_testlib_taxicab_number"); 47 if (taxicab_number == nullptr) { 48 *error_msg = dlerror(); 49 dlclose(handle); 50 return false; 51 } 52 53 dlclose(handle); 54 55 uintptr_t page_start = reinterpret_cast<uintptr_t>(taxicab_number) & ~(PAGE_SIZE - 1); 56 if (mprotect(reinterpret_cast<void*>(page_start), PAGE_SIZE, PROT_NONE) == 0) { 57 *error_msg = std::string("The library \"") + 58 kTestLibName + 59 "\" has not been unloaded on dlclose()"; 60 return false; 61 } 62 63 if (errno != ENOMEM) { 64 *error_msg = std::string("Unexpected error on mprotect: ") + strerror(errno); 65 return false; 66 } 67 68 return true; 69 } 70 Java_android_jni_cts_BasicLoaderTestHelper_nativeRunTests(JNIEnv * env)71extern "C" JNIEXPORT jstring JNICALL Java_android_jni_cts_BasicLoaderTestHelper_nativeRunTests( 72 JNIEnv* env) { 73 std::string error_str; 74 75 if (!run_test(&error_str)) { 76 return env->NewStringUTF(error_str.c_str()); 77 } 78 79 return nullptr; 80 } 81 82