1 /*
2 * Copyright (C) 2015 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 <gtest/gtest.h>
18 #include <pthread.h>
19 #include <fcntl.h>
20 #include <unistd.h>
21 #include <sys/types.h>
22 #include <sys/stat.h>
23 #include <sys/prctl.h>
24
25 #include "private/ScopeGuard.h"
26
27 extern "C" pid_t gettid();
28
ProcSelfReadlinkBody()29 static void ProcSelfReadlinkBody() {
30 char buf[100];
31 char buf2[1024];
32 int fd = open("/dev/null", O_RDWR | O_CLOEXEC);
33 ASSERT_NE(-1, fd);
34 snprintf(buf, sizeof(buf), "/proc/self/fd/%d", fd);
35 const char* ERRORMSG = "Please apply the following two kernel patches:\n"
36 "* https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=73af963f9f3036dffed55c3a2898598186db1045\n"
37 "* https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=96d0df79f2644fc823f26c06491e182d87a90c2a\n";
38 ASSERT_NE(-1, readlink(buf, buf2, sizeof(buf2))) << ERRORMSG;
39 ASSERT_STREQ("/dev/null", buf2);
40 close(fd);
41 }
42
ProcSelfReadlink(void *)43 static void* ProcSelfReadlink(void*) {
44 ProcSelfReadlinkBody();
45 return NULL;
46 }
47
TEST(bug_26110743,ProcSelfReadlink)48 TEST(bug_26110743, ProcSelfReadlink) {
49 pthread_t t;
50 ASSERT_EQ(0, pthread_create(&t, NULL, ProcSelfReadlink, NULL));
51 void* result;
52 ASSERT_EQ(0, pthread_join(t, &result));
53 ASSERT_EQ(NULL, result);
54 }
55
TEST(bug_26110743,ProcSelfReadlink_NotDumpable)56 TEST(bug_26110743, ProcSelfReadlink_NotDumpable) {
57 int dumpable = prctl(PR_GET_DUMPABLE, 0, 0, 0, 0);
58 prctl(PR_SET_DUMPABLE, 0, 0, 0, 0);
59 auto guard = make_scope_guard([&]() {
60 // restore dumpable
61 prctl(PR_SET_DUMPABLE, dumpable, 0, 0, 0);
62 });
63
64 pthread_t t;
65 ASSERT_EQ(0, pthread_create(&t, NULL, ProcSelfReadlink, NULL));
66 void* result;
67 ASSERT_EQ(0, pthread_join(t, &result));
68 ASSERT_EQ(NULL, result);
69 }
70
ProcTaskFdReadlinkBody()71 static void ProcTaskFdReadlinkBody() {
72 char buf[200];
73 char buf2[1024];
74 int fd = open("/dev/null", O_RDWR | O_CLOEXEC);
75 ASSERT_NE(-1, fd);
76 pid_t mypid = getpid();
77 pid_t mytid = gettid();
78 ASSERT_NE(mypid, mytid);
79 snprintf(buf, sizeof(buf), "/proc/%d/task/%d/fd/%d", mypid, mytid, fd);
80 const char* ERRORMSG = "Please apply the following kernel patch:\n"
81 "* https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54708d2858e79a2bdda10bf8a20c80eb96c20613\n";
82 ASSERT_NE(-1, readlink(buf, buf2, sizeof(buf2))) << ERRORMSG;
83 ASSERT_STREQ("/dev/null", buf2);
84 close(fd);
85 }
86
ProcTaskFdReadlink(void *)87 static void* ProcTaskFdReadlink(void*) {
88 ProcTaskFdReadlinkBody();
89 return NULL;
90 }
91
TEST(bug_26110743,ProcTaskFdReadlink)92 TEST(bug_26110743, ProcTaskFdReadlink) {
93 pthread_t t;
94 ASSERT_EQ(0, pthread_create(&t, NULL, ProcTaskFdReadlink, NULL));
95 void* result;
96 ASSERT_EQ(0, pthread_join(t, &result));
97 ASSERT_EQ(NULL, result);
98 }
99
TEST(bug_26110743,ProcTaskFdReadlink_NotDumpable)100 TEST(bug_26110743, ProcTaskFdReadlink_NotDumpable) {
101 int dumpable = prctl(PR_GET_DUMPABLE, 0, 0, 0, 0);
102 prctl(PR_SET_DUMPABLE, 0, 0, 0, 0);
103 auto guard = make_scope_guard([&]() {
104 // restore dumpable
105 prctl(PR_SET_DUMPABLE, dumpable, 0, 0, 0);
106 });
107
108 pthread_t t;
109 ASSERT_EQ(0, pthread_create(&t, NULL, ProcTaskFdReadlink, NULL));
110 void* result;
111 ASSERT_EQ(0, pthread_join(t, &result));
112 ASSERT_EQ(NULL, result);
113 }
114