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      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 
     19 #include <memory>
     20 
     21 #include <android-base/file.h>
     22 #include <android-base/logging.h>
     23 #include <android-base/test_utils.h>
     24 #include <ziparchive/zip_archive.h>
     25 
     26 #if defined(__ANDROID__)
     27 #include <sys/system_properties.h>
     28 #endif
     29 
     30 #include "get_test_data.h"
     31 #include "read_elf.h"
     32 #include "utils.h"
     33 
     34 static std::string testdata_dir;
     35 
     36 #if defined(IN_CTS_TEST)
     37 static const std::string testdata_section = ".testzipdata";
     38 
     39 static bool ExtractTestDataFromElfSection() {
     40   if (!MkdirWithParents(testdata_dir)) {
     41     PLOG(ERROR) << "failed to create testdata_dir " << testdata_dir;
     42     return false;
     43   }
     44   std::string content;
     45   if (!ReadSectionFromElfFile("/proc/self/exe", testdata_section, &content)) {
     46     LOG(ERROR) << "failed to read section " << testdata_section;
     47     return false;
     48   }
     49   TemporaryFile tmp_file;
     50   if (!android::base::WriteStringToFile(content, tmp_file.path)) {
     51     PLOG(ERROR) << "failed to write file " << tmp_file.path;
     52     return false;
     53   }
     54   ArchiveHelper ahelper(tmp_file.fd, tmp_file.path);
     55   if (!ahelper) {
     56     LOG(ERROR) << "failed to open archive " << tmp_file.path;
     57     return false;
     58   }
     59   ZipArchiveHandle& handle = ahelper.archive_handle();
     60   void* cookie;
     61   int ret = StartIteration(handle, &cookie, nullptr, nullptr);
     62   if (ret != 0) {
     63     LOG(ERROR) << "failed to start iterating zip entries";
     64     return false;
     65   }
     66   std::unique_ptr<void, decltype(&EndIteration)> guard(cookie, EndIteration);
     67   ZipEntry entry;
     68   ZipString name;
     69   while (Next(cookie, &entry, &name) == 0) {
     70     std::string entry_name(name.name, name.name + name.name_length);
     71     std::string path = testdata_dir + entry_name;
     72     // Skip dir.
     73     if (path.back() == '/') {
     74       continue;
     75     }
     76     if (!MkdirWithParents(path)) {
     77       LOG(ERROR) << "failed to create dir for " << path;
     78       return false;
     79     }
     80     FileHelper fhelper = FileHelper::OpenWriteOnly(path);
     81     if (!fhelper) {
     82       PLOG(ERROR) << "failed to create file " << path;
     83       return false;
     84     }
     85     std::vector<uint8_t> data(entry.uncompressed_length);
     86     if (ExtractToMemory(handle, &entry, data.data(), data.size()) != 0) {
     87       LOG(ERROR) << "failed to extract entry " << entry_name;
     88       return false;
     89     }
     90     if (!android::base::WriteFully(fhelper.fd(), data.data(), data.size())) {
     91       LOG(ERROR) << "failed to write file " << path;
     92       return false;
     93     }
     94   }
     95   return true;
     96 }
     97 
     98 #if defined(__ANDROID__)
     99 class SavedPerfHardenProperty {
    100  public:
    101   SavedPerfHardenProperty() {
    102     __system_property_get("security.perf_harden", prop_value_);
    103     if (!android::base::ReadFileToString("/proc/sys/kernel/perf_event_paranoid",
    104                                     &paranoid_value_)) {
    105       PLOG(ERROR) << "failed to read /proc/sys/kernel/perf_event_paranoid";
    106     }
    107   }
    108 
    109   ~SavedPerfHardenProperty() {
    110     if (strlen(prop_value_) != 0) {
    111       if (__system_property_set("security.perf_harden", prop_value_) != 0) {
    112         PLOG(ERROR) << "failed to set security.perf_harden";
    113         return;
    114       }
    115       // Sleep one second to wait for security.perf_harden changing
    116       // /proc/sys/kernel/perf_event_paranoid.
    117       sleep(1);
    118       std::string paranoid_value;
    119       if (!android::base::ReadFileToString("/proc/sys/kernel/perf_event_paranoid",
    120                                            &paranoid_value)) {
    121         PLOG(ERROR) << "failed to read /proc/sys/kernel/perf_event_paranoid";
    122         return;
    123       }
    124       if (paranoid_value_ != paranoid_value) {
    125         LOG(ERROR) << "failed to restore /proc/sys/kernel/perf_event_paranoid";
    126       }
    127     }
    128   }
    129 
    130  private:
    131   char prop_value_[PROP_VALUE_MAX];
    132   std::string paranoid_value_;
    133 };
    134 #endif  // defined(__ANDROID__)
    135 #endif  // defined(IN_CTS_TEST)
    136 
    137 int main(int argc, char** argv) {
    138   InitLogging(argv, android::base::StderrLogger);
    139   testing::InitGoogleTest(&argc, argv);
    140   android::base::LogSeverity log_severity = android::base::WARNING;
    141 
    142   for (int i = 1; i < argc; ++i) {
    143     if (strcmp(argv[i], "-t") == 0 && i + 1 < argc) {
    144       testdata_dir = argv[i + 1];
    145       i++;
    146     } else if (strcmp(argv[i], "--log") == 0) {
    147       if (i + 1 < argc) {
    148         ++i;
    149         if (!GetLogSeverity(argv[i], &log_severity)) {
    150           LOG(ERROR) << "Unknown log severity: " << argv[i];
    151           return 1;
    152         }
    153       } else {
    154         LOG(ERROR) << "Missing argument for --log option.\n";
    155         return 1;
    156       }
    157     }
    158   }
    159   android::base::ScopedLogSeverity severity(log_severity);
    160 
    161 #if defined(IN_CTS_TEST)
    162   std::unique_ptr<TemporaryDir> tmp_dir;
    163   if (!::testing::GTEST_FLAG(list_tests) && testdata_dir.empty()) {
    164     tmp_dir.reset(new TemporaryDir);
    165     testdata_dir = std::string(tmp_dir->path) + "/";
    166     if (!ExtractTestDataFromElfSection()) {
    167       LOG(ERROR) << "failed to extract test data from elf section";
    168       return 1;
    169     }
    170   }
    171 
    172 #if defined(__ANDROID__)
    173   // A cts test PerfEventParanoidTest.java is testing if
    174   // /proc/sys/kernel/perf_event_paranoid is 3, so restore perf_harden
    175   // value after current test to not break that test.
    176   SavedPerfHardenProperty saved_perf_harden;
    177 #endif
    178 #endif
    179   if (!::testing::GTEST_FLAG(list_tests) && testdata_dir.empty()) {
    180     printf("Usage: %s -t <testdata_dir>\n", argv[0]);
    181     return 1;
    182   }
    183   if (testdata_dir.back() != '/') {
    184     testdata_dir.push_back('/');
    185   }
    186   LOG(INFO) << "testdata is in " << testdata_dir;
    187   return RUN_ALL_TESTS();
    188 }
    189 
    190 std::string GetTestData(const std::string& filename) {
    191   return testdata_dir + filename;
    192 }
    193 
    194 const std::string& GetTestDataDir() {
    195   return testdata_dir;
    196 }
    197