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 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 43 static void* ProcSelfReadlink(void*) { 44 ProcSelfReadlinkBody(); 45 return NULL; 46 } 47 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 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 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 87 static void* ProcTaskFdReadlink(void*) { 88 ProcTaskFdReadlinkBody(); 89 return NULL; 90 } 91 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 } 99 100 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
