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_block_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
TEST(linker_allocator,test_nominal)51 TEST(linker_allocator, test_nominal) {
52 LinkerTypeAllocator<test_struct_nominal> allocator;
53
54 test_struct_nominal* ptr1 = allocator.alloc();
55 ASSERT_TRUE(ptr1 != nullptr);
56 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(ptr1) % 16);
57 test_struct_nominal* ptr2 = allocator.alloc();
58 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(ptr2) % 16);
59 ASSERT_TRUE(ptr2 != nullptr);
60 // they should be next to each other.
61 ASSERT_EQ(reinterpret_cast<uint8_t*>(ptr1)+16, reinterpret_cast<uint8_t*>(ptr2));
62
63 ptr1->value = 42;
64
65 allocator.free(ptr1);
66 allocator.free(ptr2);
67 }
68
TEST(linker_allocator,test_small)69 TEST(linker_allocator, test_small) {
70 LinkerTypeAllocator<test_struct_small> allocator;
71
72 char* ptr1 = reinterpret_cast<char*>(allocator.alloc());
73 char* ptr2 = reinterpret_cast<char*>(allocator.alloc());
74
75 ASSERT_TRUE(ptr1 != nullptr);
76 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(ptr1) % 16);
77 ASSERT_TRUE(ptr2 != nullptr);
78 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(ptr2) % 16);
79 ASSERT_EQ(ptr1+16, ptr2); // aligned to 16
80 }
81
TEST(linker_allocator,test_larger)82 TEST(linker_allocator, test_larger) {
83 LinkerTypeAllocator<test_struct_larger> allocator;
84
85 test_struct_larger* ptr1 = allocator.alloc();
86 test_struct_larger* ptr2 = allocator.alloc();
87
88 ASSERT_TRUE(ptr1 != nullptr);
89 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(ptr1) % 16);
90 ASSERT_TRUE(ptr2 != nullptr);
91 ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(ptr2) % 16);
92
93 ASSERT_EQ(reinterpret_cast<uint8_t*>(ptr1) + 1024, reinterpret_cast<uint8_t*>(ptr2));
94
95 // lets allocate until we reach next page.
96 size_t n = kPageSize/sizeof(test_struct_larger) + 1 - 2;
97
98 for (size_t i=0; i<n; ++i) {
99 ASSERT_TRUE(allocator.alloc() != nullptr);
100 }
101
102 test_struct_larger* ptr_to_free = allocator.alloc();
103 ASSERT_TRUE(ptr_to_free != nullptr);
104 allocator.free(ptr1);
105 }
106
protect_all()107 static void protect_all() {
108 LinkerTypeAllocator<test_struct_larger> allocator;
109
110 // number of allocs to reach the end of first page
111 size_t n = kPageSize/sizeof(test_struct_larger) - 1;
112 test_struct_larger* page1_ptr = allocator.alloc();
113
114 for (size_t i=0; i<n; ++i) {
115 allocator.alloc();
116 }
117
118 test_struct_larger* page2_ptr = allocator.alloc();
119 allocator.protect_all(PROT_READ);
120 allocator.protect_all(PROT_READ | PROT_WRITE);
121 // check access
122 page2_ptr->dummy_str[23] = 27;
123 page1_ptr->dummy_str[13] = 11;
124
125 allocator.protect_all(PROT_READ);
126 fprintf(stderr, "trying to access protected page");
127
128 // this should result in segmentation fault
129 page1_ptr->dummy_str[11] = 7;
130 }
131
TEST(linker_allocator,test_protect)132 TEST(linker_allocator, test_protect) {
133 testing::FLAGS_gtest_death_test_style = "threadsafe";
134 ASSERT_EXIT(protect_all(), testing::KilledBySignal(SIGSEGV), "trying to access protected page");
135 }
136
137