2 * Copyright (C) 2015 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
20 #include <sys/capability.h>
22 #include <sys/prctl.h>
28 #include <gtest/gtest.h>
30 #include "android-base/file.h"
31 #include "android-base/strings.h"
32 #include "private/bionic_prctl.h"
35 TEST(sys_prctl, bug_20017123) {
36 #if defined(__ANDROID__) // PR_SET_VMA is only available in Android kernels.
37 size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));
38 void* p = mmap(NULL, page_size * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
39 ASSERT_NE(MAP_FAILED, p);
40 ASSERT_EQ(0, mprotect(p, page_size, PROT_NONE));
41 ASSERT_NE(-1, prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, p, page_size * 3, "anonymous map space"));
42 // Now read the maps and verify that there are no overlapped maps.
43 std::string file_data;
44 ASSERT_TRUE(android::base::ReadFileToString("/proc/self/maps", &file_data));
46 uintptr_t last_end = 0;
47 std::vector<std::string> lines = android::base::Split(file_data, "\n");
48 for (size_t i = 0; i < lines.size(); i++) {
49 if (lines[i].empty()) {
54 ASSERT_EQ(2, sscanf(lines[i].c_str(), "%" SCNxPTR "-%" SCNxPTR " ", &start, &end))
55 << "Failed to parse line: " << lines[i];
56 // This will never fail on the first line, so no need to do any special checking.
57 ASSERT_GE(start, last_end)
58 << "Overlapping map detected:\n" << lines[i -1] << '\n' << lines[i] << '\n';
62 ASSERT_EQ(0, munmap(p, page_size * 3));
64 GTEST_LOG_(INFO) << "This test does nothing as it tests an Android specific kernel feature.";
68 TEST(sys_prctl, pr_cap_ambient) {
69 // PR_CAP_AMBIENT was introduced in v4.3. Android devices should always
70 // have a backport, but we can't guarantee it's available on the host.
71 #if defined(__ANDROID__) || defined(PR_CAP_AMBIENT)
72 const std::string caps_sha =
73 "https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/"
74 "?id=58319057b7847667f0c9585b9de0e8932b0fdb08";
75 const std::string caps_typo_sha =
76 "https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/"
77 "?id=b7f76ea2ef6739ee484a165ffbac98deb855d3d3";
79 auto err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0);
81 // EINVAL -> unrecognized prctl option
82 ASSERT_NE(EINVAL, errno) << "kernel missing required commits:\n"
84 << caps_typo_sha << "\n";
86 // Unprivileged processes shouldn't be able to raise CAP_SYS_ADMIN,
87 // but they can check or lower it
88 err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_SYS_ADMIN, 0, 0);
90 EXPECT_EQ(EPERM, errno);
92 err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_SYS_ADMIN, 0, 0);
95 err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_LOWER, CAP_SYS_ADMIN, 0, 0);
98 // ULONG_MAX isn't a legal cap
99 err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, ULONG_MAX, 0, 0);
101 EXPECT_EQ(EINVAL, errno);
103 err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, ULONG_MAX, 0, 0);
105 EXPECT_EQ(EINVAL, errno);
107 err = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_LOWER, ULONG_MAX, 0, 0);
109 EXPECT_EQ(EINVAL, errno);
112 << "Skipping test that requires host support for PR_CAP_AMBIENT.";