1 /*
2 * Copyright (C) 2021-2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #include <gtest/gtest.h>
16 #include <fcntl.h>
17 #include <cinttypes>
18 #include <climits>
19 #include <cstdio>
20 #include <unistd.h>
21
22 #include <iomanip>
23 #include <iostream>
24 #include <string>
25 #include <vector>
26
27 #include <sys/mman.h>
28 #include <sys/prctl.h>
29 #include <sys/utsname.h>
30 #include <string>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include "securec.h"
34 #ifndef PR_SET_VMA
35 const PR_SET_VMA 0x53564d41
36 #endif
37
38 #ifndef PR_SET_VMA_ANON_NAME
39 const int PR_SET_VMA_ANON_NAME = 0;
40 #endif
41
42 using namespace testing::ext;
43 using namespace std;
44
45 class PrctlApiTest : public testing::Test {
46 public:
47 static void SetUpTestCase();
48 static void TearDownTestCase();
49 void SetUp();
50 void TearDown();
51 private:
52 };
SetUp()53 void PrctlApiTest::SetUp()
54 {
55 }
TearDown()56 void PrctlApiTest::TearDown()
57 {
58 }
SetUpTestCase()59 void PrctlApiTest::SetUpTestCase()
60 {
61 }
TearDownTestCase()62 void PrctlApiTest::TearDownTestCase()
63 {
64 }
65
handle_error(const std::string &msg)66 static bool handle_error(const std::string &msg)
67 {
68 perror(msg.c_str());
69 return false;
70 }
71
str_split(const std::string &s, const std::string &delimiters)72 static std::vector<std::string> str_split(const std::string &s, const std::string &delimiters)
73 {
74 if (delimiters.size(), 0U)
75 abort();
76
77 std::vector<std::string> result;
78 size_t base = 0;
79 size_t found;
80
81 while (true) {
82 found = s.find_first_of(delimiters, base);
83 result.push_back(s.substr(base, found - base));
84 if (found == s.npos)
85 break;
86 base = found + 1;
87 }
88
89 return result;
90 }
91
read_fd_to_string(const std::string &path, std::string *content)92 static bool read_fd_to_string(const std::string &path, std::string *content)
93 {
94 char buf[BUFSIZ];
95 ssize_t n;
96 int fd;
97
98 fd = TEMP_FAILURE_RETRY(open(path.c_str(), O_RDONLY | O_CLOEXEC | O_NOFOLLOW));
99 if (fd == -1) {
100 return false;
101 }
102 content->clear();
103 while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], sizeof(buf)))) > 0)
104 content->append(buf, n);
105
106 TEMP_FAILURE_RETRY(close(fd));
107 return (n == 0) ? true : false;
108 }
109
SetVmaAnonName(void)110 int SetVmaAnonName(void)
111 {
112 size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));
113 const int NUMBER_PAGE = 3;
114 void *ret_pm = nullptr;
115
116 ret_pm = mmap(NULL, page_size * NUMBER_PAGE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
117 if (static_cast< int >(*(int *)ret_pm) == static_cast<int>(-1)) {
118 handle_error("mmap fail\n");
119 }
120 if (mprotect(ret_pm, page_size, PROT_NONE)) {
121 handle_error("mprotect fail\n");
122 }
123 if (prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, ret_pm, page_size * NUMBER_PAGE, "anonymous map space")) {
124 handle_error("prctl fail \n");
125 }
126 // Now read the maps and verify that there are no overlapped maps.
127 std::string file_data;
128 if (!read_fd_to_string("/proc/self/maps", &file_data))
129 handle_error("read string\n");
130
131 uintptr_t last_end = 0;
132 std::vector<std::string> lines = str_split(file_data, "\n");
133 for (size_t i = 0; i < lines.size(); i++) {
134 if (lines[i].empty())
135 continue;
136
137 uintptr_t start, end;
138 if (sscanf_s(lines[i].c_str(), "%" SCNxPTR "-%" SCNxPTR " ", &start, &end) != 2)
139 std::cout << "FAILED to parse line :" << lines[i];
140
141 // This will never fail on the first line , so no need to do any special checking.
142 if (start < last_end)
143 std::cout << "Overlapping map detected:\n"
144 << lines[i - 1] << '\n'
145 << lines[i] << '\n';
146
147 last_end = end;
148 }
149
150 if (munmap(ret_pm, page_size * NUMBER_PAGE)) {
151 handle_error("munmap fail\n");
152 }
153 return 0;
154 }
155
156 /*
157 * @tc.number PRCTL_SET_VMA_NAME_0100
158 * @tc.name faultlogger Detect a cpp crash happen
159 * @tc.desc inject a cppcrash fault and check faultlogger can detect the fault
160 */
HWTEST_F(PrctlApiTest, SetVmaAnonName0100, Function | MediumTest | Level1)161 HWTEST_F(PrctlApiTest, SetVmaAnonName0100, Function | MediumTest | Level1)
162 {
163 int ret = false;
164 ret = SetVmaAnonName();
165 ASSERT_TRUE(false == ret);
166 }
167