1 /* 2 * Copyright (C) 2013 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 #include <stdlib.h> 18 #include <string.h> 19 #include <sys/mman.h> 20 21 #include <gtest/gtest.h> 22 23 #include "../linker_allocator.h" 24 25 #include <unistd.h> 26 27 namespace { 28 29 struct test_struct_nominal { 30 void* pointer; 31 ssize_t value; 32 }; 33 34 /* 35 * this one has size below allocator cap which is 2*sizeof(void*) 36 */ 37 struct test_struct_small { 38 char dummy_str[5]; 39 }; 40 41 /* 42 * 1009 byte struct (1009 is prime) 43 */ 44 struct test_struct_larger { 45 char dummy_str[1009]; 46 }; 47 48 static size_t kPageSize = sysconf(_SC_PAGE_SIZE); 49 }; 50 51 TEST(linker_allocator, test_nominal) { 52 LinkerAllocator<test_struct_nominal> allocator; 53 54 test_struct_nominal* ptr1 = allocator.alloc(); 55 ASSERT_TRUE(ptr1 != nullptr); 56 test_struct_nominal* ptr2 = allocator.alloc(); 57 ASSERT_TRUE(ptr2 != nullptr); 58 // they should be next to each other. 59 ASSERT_EQ(ptr1+1, ptr2); 60 61 ptr1->value = 42; 62 63 allocator.free(ptr1); 64 allocator.free(ptr2); 65 } 66 67 TEST(linker_allocator, test_small) { 68 LinkerAllocator<test_struct_small> allocator; 69 70 char* ptr1 = reinterpret_cast<char*>(allocator.alloc()); 71 char* ptr2 = reinterpret_cast<char*>(allocator.alloc()); 72 73 ASSERT_TRUE(ptr1 != nullptr); 74 ASSERT_TRUE(ptr2 != nullptr); 75 ASSERT_EQ(ptr1+2*sizeof(void*), ptr2); 76 } 77 78 TEST(linker_allocator, test_larger) { 79 LinkerAllocator<test_struct_larger> allocator; 80 81 test_struct_larger* ptr1 = allocator.alloc(); 82 test_struct_larger* ptr2 = allocator.alloc(); 83 84 ASSERT_TRUE(ptr1 != nullptr); 85 ASSERT_TRUE(ptr2 != nullptr); 86 87 ASSERT_EQ(ptr1+1, ptr2); 88 89 // lets allocate until we reach next page. 90 size_t n = kPageSize/sizeof(test_struct_larger) + 1 - 2; 91 92 for (size_t i=0; i<n; ++i) { 93 ASSERT_TRUE(allocator.alloc() != nullptr); 94 } 95 96 test_struct_larger* ptr_to_free = allocator.alloc(); 97 ASSERT_TRUE(ptr_to_free != nullptr); 98 allocator.free(ptr1); 99 } 100 101 static void protect_all() { 102 LinkerAllocator<test_struct_larger> allocator; 103 104 // number of allocs to reach the end of first page 105 size_t n = kPageSize/sizeof(test_struct_larger) - 1; 106 test_struct_larger* page1_ptr = allocator.alloc(); 107 108 for (size_t i=0; i<n; ++i) { 109 allocator.alloc(); 110 } 111 112 test_struct_larger* page2_ptr = allocator.alloc(); 113 allocator.protect_all(PROT_READ); 114 allocator.protect_all(PROT_READ | PROT_WRITE); 115 // check access 116 page2_ptr->dummy_str[23] = 27; 117 page1_ptr->dummy_str[13] = 11; 118 119 allocator.protect_all(PROT_READ); 120 fprintf(stderr, "trying to access protected page"); 121 122 // this should result in segmentation fault 123 page1_ptr->dummy_str[11] = 7; 124 } 125 126 TEST(linker_allocator, test_protect) { 127 testing::FLAGS_gtest_death_test_style = "threadsafe"; 128 ASSERT_EXIT(protect_all(), testing::KilledBySignal(SIGSEGV), "trying to access protected page"); 129 } 130 131
