dlext_test.cpp revision 2ba1cf39ae6087249a839ec7b3793d4d4fa75438 
1/*
2 * Copyright (C) 2014 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 <dlfcn.h>
20#include <elf.h>
21#include <errno.h>
22#include <fcntl.h>
23#include <inttypes.h>
24#include <stdio.h>
25#include <string.h>
26#include <unistd.h>
27#include <android/dlext.h>
28#include <sys/mman.h>
29#include <sys/types.h>
30#include <sys/wait.h>
31
32#include <pagemap/pagemap.h>
33#include <ziparchive/zip_archive.h>
34
35#include "TemporaryFile.h"
36#include "utils.h"
37#include "dlext_private.h"
38
39#define ASSERT_DL_NOTNULL(ptr) \
40    ASSERT_TRUE(ptr != nullptr) << "dlerror: " << dlerror()
41
42#define ASSERT_DL_ZERO(i) \
43    ASSERT_EQ(0, i) << "dlerror: " << dlerror()
44
45#define ASSERT_NOERROR(i) \
46    ASSERT_NE(-1, i) << "errno: " << strerror(errno)
47
48#define ASSERT_SUBSTR(needle, haystack) \
49    ASSERT_PRED_FORMAT2(::testing::IsSubstring, needle, haystack)
50
51
52typedef int (*fn)(void);
53#define LIBNAME "libdlext_test.so"
54#define LIBNAME_NORELRO "libdlext_test_norelro.so"
55#define LIBSIZE 1024*1024 // how much address space to reserve for it
56
57#if defined(__LP64__)
58#define NATIVE_TESTS_PATH "/nativetest64"
59#else
60#define NATIVE_TESTS_PATH "/nativetest"
61#endif
62
63#define LIBPATH NATIVE_TESTS_PATH "/libdlext_test_fd/libdlext_test_fd.so"
64#define LIBZIPPATH NATIVE_TESTS_PATH "/libdlext_test_zip/libdlext_test_zip_zipaligned.zip"
65#define LIBZIPPATH_WITH_RUNPATH NATIVE_TESTS_PATH "/libdlext_test_runpath_zip/libdlext_test_runpath_zip_zipaligned.zip"
66#define LIBZIP_SIMPLE_ZIP "libdir/libatest_simple_zip.so"
67
68class DlExtTest : public ::testing::Test {
69protected:
70  virtual void SetUp() {
71    handle_ = nullptr;
72    // verify that we don't have the library loaded already
73    void* h = dlopen(LIBNAME, RTLD_NOW | RTLD_NOLOAD);
74    ASSERT_TRUE(h == nullptr);
75    h = dlopen(LIBNAME_NORELRO, RTLD_NOW | RTLD_NOLOAD);
76    ASSERT_TRUE(h == nullptr);
77    // call dlerror() to swallow the error, and check it was the one we wanted
78    ASSERT_STREQ("dlopen failed: library \"" LIBNAME_NORELRO "\" wasn't loaded and RTLD_NOLOAD prevented it", dlerror());
79  }
80
81  virtual void TearDown() {
82    if (handle_ != nullptr) {
83      ASSERT_DL_ZERO(dlclose(handle_));
84    }
85  }
86
87  void* handle_;
88};
89
90TEST_F(DlExtTest, ExtInfoNull) {
91  handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, nullptr);
92  ASSERT_DL_NOTNULL(handle_);
93  fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
94  ASSERT_DL_NOTNULL(f);
95  EXPECT_EQ(4, f());
96}
97
98TEST_F(DlExtTest, ExtInfoNoFlags) {
99  android_dlextinfo extinfo;
100  extinfo.flags = 0;
101  handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
102  ASSERT_DL_NOTNULL(handle_);
103  fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
104  ASSERT_DL_NOTNULL(f);
105  EXPECT_EQ(4, f());
106}
107
108TEST_F(DlExtTest, ExtInfoUseFd) {
109  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBPATH;
110
111  android_dlextinfo extinfo;
112  extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD;
113  extinfo.library_fd = TEMP_FAILURE_RETRY(open(lib_path.c_str(), O_RDONLY | O_CLOEXEC));
114  ASSERT_TRUE(extinfo.library_fd != -1);
115  handle_ = android_dlopen_ext(lib_path.c_str(), RTLD_NOW, &extinfo);
116  ASSERT_DL_NOTNULL(handle_);
117  fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
118  ASSERT_DL_NOTNULL(f);
119  EXPECT_EQ(4, f());
120
121  uint32_t* taxicab_number = reinterpret_cast<uint32_t*>(dlsym(handle_, "dlopen_testlib_taxicab_number"));
122  ASSERT_DL_NOTNULL(taxicab_number);
123  EXPECT_EQ(1729U, *taxicab_number);
124}
125
126TEST_F(DlExtTest, ExtInfoUseFdWithOffset) {
127  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBZIPPATH;
128
129  android_dlextinfo extinfo;
130  extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD | ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET;
131  extinfo.library_fd = TEMP_FAILURE_RETRY(open(lib_path.c_str(), O_RDONLY | O_CLOEXEC));
132
133  // Find the offset of the shared library in the zip.
134  ZipArchiveHandle handle;
135  ASSERT_EQ(0, OpenArchive(lib_path.c_str(), &handle));
136  ZipEntry zip_entry;
137  ZipString zip_name;
138  zip_name.name = reinterpret_cast<const uint8_t*>(LIBZIP_SIMPLE_ZIP);
139  zip_name.name_length = sizeof(LIBZIP_SIMPLE_ZIP) - 1;
140  ASSERT_EQ(0, FindEntry(handle, zip_name, &zip_entry));
141  extinfo.library_fd_offset = zip_entry.offset;
142  CloseArchive(handle);
143
144  handle_ = android_dlopen_ext(lib_path.c_str(), RTLD_NOW, &extinfo);
145  ASSERT_DL_NOTNULL(handle_);
146
147  uint32_t* taxicab_number = reinterpret_cast<uint32_t*>(dlsym(handle_, "dlopen_testlib_taxicab_number"));
148  ASSERT_DL_NOTNULL(taxicab_number);
149  EXPECT_EQ(1729U, *taxicab_number);
150}
151
152TEST_F(DlExtTest, ExtInfoUseFdWithInvalidOffset) {
153  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBZIPPATH;
154  // lib_path is relative when $ANDROID_DATA is relative
155  char lib_realpath_buf[PATH_MAX];
156  ASSERT_TRUE(realpath(lib_path.c_str(), lib_realpath_buf) == lib_realpath_buf);
157  const std::string lib_realpath = std::string(lib_realpath_buf);
158
159  android_dlextinfo extinfo;
160  extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD | ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET;
161  extinfo.library_fd = TEMP_FAILURE_RETRY(open(lib_path.c_str(), O_RDONLY | O_CLOEXEC));
162  extinfo.library_fd_offset = 17;
163
164  handle_ = android_dlopen_ext("libname_placeholder", RTLD_NOW, &extinfo);
165  ASSERT_TRUE(handle_ == nullptr);
166  ASSERT_STREQ("dlopen failed: file offset for the library \"libname_placeholder\" is not page-aligned: 17", dlerror());
167
168  // Test an address above 2^44, for http://b/18178121 .
169  extinfo.library_fd_offset = (5LL<<48) + PAGE_SIZE;
170  handle_ = android_dlopen_ext("libname_placeholder", RTLD_NOW, &extinfo);
171  ASSERT_TRUE(handle_ == nullptr);
172  ASSERT_SUBSTR("dlopen failed: file offset for the library \"libname_placeholder\" >= file size", dlerror());
173
174  extinfo.library_fd_offset = 0LL - PAGE_SIZE;
175  handle_ = android_dlopen_ext("libname_placeholder", RTLD_NOW, &extinfo);
176  ASSERT_TRUE(handle_ == nullptr);
177  ASSERT_SUBSTR("dlopen failed: file offset for the library \"libname_placeholder\" is negative", dlerror());
178
179  extinfo.library_fd_offset = 0;
180  handle_ = android_dlopen_ext("libname_ignored", RTLD_NOW, &extinfo);
181  ASSERT_TRUE(handle_ == nullptr);
182  ASSERT_EQ("dlopen failed: \"" + lib_realpath + "\" has bad ELF magic", dlerror());
183
184  // Check if dlsym works after unsuccessful dlopen().
185  // Supply non-exiting one to make linker visit every soinfo.
186  void* sym = dlsym(RTLD_DEFAULT, "this_symbol_does_not_exist___");
187  ASSERT_TRUE(sym == nullptr);
188
189  close(extinfo.library_fd);
190}
191
192TEST_F(DlExtTest, ExtInfoUseOffsetWithoutFd) {
193  android_dlextinfo extinfo;
194  extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET;
195  // This offset will not be used, so it doesn't matter.
196  extinfo.library_fd_offset = 0;
197
198  handle_ = android_dlopen_ext("/some/lib/that/does_not_exist", RTLD_NOW, &extinfo);
199  ASSERT_TRUE(handle_ == nullptr);
200  ASSERT_STREQ("dlopen failed: invalid extended flag combination (ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET without ANDROID_DLEXT_USE_LIBRARY_FD): 0x20", dlerror());
201}
202
203TEST(dlext, android_dlopen_ext_force_load_smoke) {
204  // 1. Open actual file
205  void* handle = dlopen("libdlext_test.so", RTLD_NOW);
206  ASSERT_DL_NOTNULL(handle);
207  // 2. Open link with force_load flag set
208  android_dlextinfo extinfo;
209  extinfo.flags = ANDROID_DLEXT_FORCE_LOAD;
210  void* handle2 = android_dlopen_ext("libdlext_test_v2.so", RTLD_NOW, &extinfo);
211  ASSERT_DL_NOTNULL(handle2);
212  ASSERT_TRUE(handle != handle2);
213
214  dlclose(handle2);
215  dlclose(handle);
216}
217
218TEST(dlext, android_dlopen_ext_force_load_soname_exception) {
219  // Check if soname lookup still returns already loaded library
220  // when ANDROID_DLEXT_FORCE_LOAD flag is specified.
221  void* handle = dlopen("libdlext_test_v2.so", RTLD_NOW);
222  ASSERT_DL_NOTNULL(handle);
223
224  android_dlextinfo extinfo;
225  extinfo.flags = ANDROID_DLEXT_FORCE_LOAD;
226
227  // Note that 'libdlext_test.so' is dt_soname for libdlext_test_v2.so
228  void* handle2 = android_dlopen_ext("libdlext_test.so", RTLD_NOW, &extinfo);
229
230  ASSERT_DL_NOTNULL(handle2);
231  ASSERT_TRUE(handle == handle2);
232
233  dlclose(handle2);
234  dlclose(handle);
235}
236
237TEST(dlfcn, dlopen_from_zip_absolute_path) {
238  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBZIPPATH;
239
240  void* handle = dlopen((lib_path + "!/libdir/libatest_simple_zip.so").c_str(), RTLD_NOW);
241  ASSERT_TRUE(handle != nullptr) << dlerror();
242
243  uint32_t* taxicab_number = reinterpret_cast<uint32_t*>(dlsym(handle, "dlopen_testlib_taxicab_number"));
244  ASSERT_DL_NOTNULL(taxicab_number);
245  EXPECT_EQ(1729U, *taxicab_number);
246
247  dlclose(handle);
248}
249
250TEST(dlfcn, dlopen_from_zip_with_dt_runpath) {
251  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBZIPPATH_WITH_RUNPATH;
252
253  void* handle = dlopen((lib_path + "!/libdir/libtest_dt_runpath_d_zip.so").c_str(), RTLD_NOW);
254
255  ASSERT_TRUE(handle != nullptr) << dlerror();
256
257  typedef void *(* dlopen_b_fn)();
258  dlopen_b_fn fn = (dlopen_b_fn)dlsym(handle, "dlopen_b");
259  ASSERT_TRUE(fn != nullptr) << dlerror();
260
261  void *p = fn();
262  ASSERT_TRUE(p != nullptr) << dlerror();
263
264  dlclose(p);
265  dlclose(handle);
266}
267
268TEST(dlfcn, dlopen_from_zip_ld_library_path) {
269  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBZIPPATH + "!/libdir";
270
271  typedef void (*fn_t)(const char*);
272  fn_t android_update_LD_LIBRARY_PATH =
273      reinterpret_cast<fn_t>(dlsym(RTLD_DEFAULT, "android_update_LD_LIBRARY_PATH"));
274
275  ASSERT_TRUE(android_update_LD_LIBRARY_PATH != nullptr) << dlerror();
276
277  void* handle = dlopen("libdlext_test_zip.so", RTLD_NOW);
278  ASSERT_TRUE(handle == nullptr);
279
280  android_update_LD_LIBRARY_PATH(lib_path.c_str());
281
282  handle = dlopen("libdlext_test_zip.so", RTLD_NOW);
283  ASSERT_TRUE(handle != nullptr) << dlerror();
284
285  int (*fn)(void);
286  fn = reinterpret_cast<int (*)(void)>(dlsym(handle, "getRandomNumber"));
287  ASSERT_TRUE(fn != nullptr);
288  EXPECT_EQ(4, fn());
289
290  uint32_t* taxicab_number =
291          reinterpret_cast<uint32_t*>(dlsym(handle, "dlopen_testlib_taxicab_number"));
292  ASSERT_DL_NOTNULL(taxicab_number);
293  EXPECT_EQ(1729U, *taxicab_number);
294
295  dlclose(handle);
296}
297
298
299TEST_F(DlExtTest, Reserved) {
300  void* start = mmap(nullptr, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
301  ASSERT_TRUE(start != MAP_FAILED);
302  android_dlextinfo extinfo;
303  extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS;
304  extinfo.reserved_addr = start;
305  extinfo.reserved_size = LIBSIZE;
306  handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
307  ASSERT_DL_NOTNULL(handle_);
308  fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
309  ASSERT_DL_NOTNULL(f);
310  EXPECT_GE(reinterpret_cast<void*>(f), start);
311  EXPECT_LT(reinterpret_cast<void*>(f),
312            reinterpret_cast<char*>(start) + LIBSIZE);
313  EXPECT_EQ(4, f());
314
315  // Check that after dlclose reserved address space is unmapped (and can be reused)
316  dlclose(handle_);
317  handle_ = nullptr;
318
319  void* new_start = mmap(start, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
320  ASSERT_NE(start, new_start) << "dlclose unmapped reserved space";
321}
322
323TEST_F(DlExtTest, ReservedTooSmall) {
324  void* start = mmap(nullptr, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
325  ASSERT_TRUE(start != MAP_FAILED);
326  android_dlextinfo extinfo;
327  extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS;
328  extinfo.reserved_addr = start;
329  extinfo.reserved_size = PAGE_SIZE;
330  handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
331  EXPECT_EQ(nullptr, handle_);
332}
333
334TEST_F(DlExtTest, ReservedHint) {
335  void* start = mmap(nullptr, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
336  ASSERT_TRUE(start != MAP_FAILED);
337  android_dlextinfo extinfo;
338  extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS_HINT;
339  extinfo.reserved_addr = start;
340  extinfo.reserved_size = LIBSIZE;
341  handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
342  ASSERT_DL_NOTNULL(handle_);
343  fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
344  ASSERT_DL_NOTNULL(f);
345  EXPECT_GE(reinterpret_cast<void*>(f), start);
346  EXPECT_LT(reinterpret_cast<void*>(f),
347            reinterpret_cast<char*>(start) + LIBSIZE);
348  EXPECT_EQ(4, f());
349}
350
351TEST_F(DlExtTest, ReservedHintTooSmall) {
352  void* start = mmap(nullptr, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
353  ASSERT_TRUE(start != MAP_FAILED);
354  android_dlextinfo extinfo;
355  extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS_HINT;
356  extinfo.reserved_addr = start;
357  extinfo.reserved_size = PAGE_SIZE;
358  handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
359  ASSERT_DL_NOTNULL(handle_);
360  fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
361  ASSERT_DL_NOTNULL(f);
362  EXPECT_TRUE(reinterpret_cast<void*>(f) < start ||
363              (reinterpret_cast<void*>(f) >=
364               reinterpret_cast<char*>(start) + PAGE_SIZE));
365  EXPECT_EQ(4, f());
366}
367
368TEST_F(DlExtTest, LoadAtFixedAddress) {
369  void* start = mmap(nullptr, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
370  ASSERT_TRUE(start != MAP_FAILED);
371  munmap(start, LIBSIZE);
372
373  android_dlextinfo extinfo;
374  extinfo.flags = ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS;
375  extinfo.reserved_addr = start;
376
377  handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
378  ASSERT_DL_NOTNULL(handle_);
379  fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
380  ASSERT_DL_NOTNULL(f);
381  EXPECT_GE(reinterpret_cast<void*>(f), start);
382  EXPECT_LT(reinterpret_cast<void*>(f), reinterpret_cast<char*>(start) + LIBSIZE);
383
384  EXPECT_EQ(4, f());
385  dlclose(handle_);
386  handle_ = nullptr;
387
388  // Check that dlclose unmapped the file
389  void* addr = mmap(start, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
390  ASSERT_EQ(start, addr) << "dlclose did not unmap the memory";
391}
392
393TEST_F(DlExtTest, LoadAtFixedAddressTooSmall) {
394  void* start = mmap(nullptr, LIBSIZE + PAGE_SIZE, PROT_NONE,
395                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
396  ASSERT_TRUE(start != MAP_FAILED);
397  munmap(start, LIBSIZE + PAGE_SIZE);
398  void* new_addr = mmap(reinterpret_cast<uint8_t*>(start) + PAGE_SIZE, LIBSIZE, PROT_NONE,
399                        MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
400  ASSERT_TRUE(new_addr != MAP_FAILED);
401
402  android_dlextinfo extinfo;
403  extinfo.flags = ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS;
404  extinfo.reserved_addr = start;
405
406  handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
407  ASSERT_TRUE(handle_ == nullptr);
408}
409
410class DlExtRelroSharingTest : public DlExtTest {
411protected:
412  virtual void SetUp() {
413    DlExtTest::SetUp();
414    void* start = mmap(nullptr, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
415    ASSERT_TRUE(start != MAP_FAILED);
416    extinfo_.flags = ANDROID_DLEXT_RESERVED_ADDRESS;
417    extinfo_.reserved_addr = start;
418    extinfo_.reserved_size = LIBSIZE;
419    extinfo_.relro_fd = -1;
420  }
421
422  virtual void TearDown() {
423    DlExtTest::TearDown();
424  }
425
426  void CreateRelroFile(const char* lib, const char* relro_file) {
427    int relro_fd = open(relro_file, O_RDWR | O_TRUNC);
428    ASSERT_NOERROR(relro_fd);
429
430    pid_t pid = fork();
431    if (pid == 0) {
432      // child process
433      extinfo_.flags |= ANDROID_DLEXT_WRITE_RELRO;
434      extinfo_.relro_fd = relro_fd;
435      void* handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo_);
436      if (handle == nullptr) {
437        fprintf(stderr, "in child: %s\n", dlerror());
438        exit(1);
439      }
440      exit(0);
441    }
442
443    // continuing in parent
444    ASSERT_NOERROR(close(relro_fd));
445    ASSERT_NOERROR(pid);
446    AssertChildExited(pid, 0);
447
448    // reopen file for reading so it can be used
449    relro_fd = open(relro_file, O_RDONLY);
450    ASSERT_NOERROR(relro_fd);
451    extinfo_.flags |= ANDROID_DLEXT_USE_RELRO;
452    extinfo_.relro_fd = relro_fd;
453  }
454
455  void TryUsingRelro(const char* lib) {
456    handle_ = android_dlopen_ext(lib, RTLD_NOW, &extinfo_);
457    ASSERT_DL_NOTNULL(handle_);
458    fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
459    ASSERT_DL_NOTNULL(f);
460    EXPECT_EQ(4, f());
461
462    uint32_t* taxicab_number =
463            reinterpret_cast<uint32_t*>(dlsym(handle_, "dlopen_testlib_taxicab_number"));
464    ASSERT_DL_NOTNULL(taxicab_number);
465    EXPECT_EQ(1729U, *taxicab_number);
466  }
467
468  void SpawnChildrenAndMeasurePss(const char* lib, bool share_relro, size_t* pss_out);
469
470  android_dlextinfo extinfo_;
471};
472
473TEST_F(DlExtRelroSharingTest, ChildWritesGoodData) {
474  TemporaryFile tf; // Use tf to get an unique filename.
475  ASSERT_NOERROR(close(tf.fd));
476
477  ASSERT_NO_FATAL_FAILURE(CreateRelroFile(LIBNAME, tf.filename));
478  ASSERT_NO_FATAL_FAILURE(TryUsingRelro(LIBNAME));
479
480  // Use destructor of tf to close and unlink the file.
481  tf.fd = extinfo_.relro_fd;
482}
483
484TEST_F(DlExtRelroSharingTest, ChildWritesNoRelro) {
485  TemporaryFile tf; // // Use tf to get an unique filename.
486  ASSERT_NOERROR(close(tf.fd));
487
488  ASSERT_NO_FATAL_FAILURE(CreateRelroFile(LIBNAME_NORELRO, tf.filename));
489  ASSERT_NO_FATAL_FAILURE(TryUsingRelro(LIBNAME_NORELRO));
490
491  // Use destructor of tf to close and unlink the file.
492  tf.fd = extinfo_.relro_fd;
493}
494
495TEST_F(DlExtRelroSharingTest, RelroFileEmpty) {
496  ASSERT_NO_FATAL_FAILURE(TryUsingRelro(LIBNAME));
497}
498
499TEST_F(DlExtRelroSharingTest, VerifyMemorySaving) {
500  if (geteuid() != 0) {
501    GTEST_LOG_(INFO) << "This test must be run as root.\n";
502    return;
503  }
504
505  TemporaryFile tf; // Use tf to get an unique filename.
506  ASSERT_NOERROR(close(tf.fd));
507
508  ASSERT_NO_FATAL_FAILURE(CreateRelroFile(LIBNAME, tf.filename));
509
510  int pipefd[2];
511  ASSERT_NOERROR(pipe(pipefd));
512
513  size_t without_sharing, with_sharing;
514  ASSERT_NO_FATAL_FAILURE(SpawnChildrenAndMeasurePss(LIBNAME, false, &without_sharing));
515  ASSERT_NO_FATAL_FAILURE(SpawnChildrenAndMeasurePss(LIBNAME, true, &with_sharing));
516
517  // We expect the sharing to save at least 10% of the total PSS. In practice
518  // it saves 40%+ for this test.
519  size_t expected_size = without_sharing - (without_sharing/10);
520  EXPECT_LT(with_sharing, expected_size);
521
522  // Use destructor of tf to close and unlink the file.
523  tf.fd = extinfo_.relro_fd;
524}
525
526void getPss(pid_t pid, size_t* pss_out) {
527  pm_kernel_t* kernel;
528  ASSERT_EQ(0, pm_kernel_create(&kernel));
529
530  pm_process_t* process;
531  ASSERT_EQ(0, pm_process_create(kernel, pid, &process));
532
533  pm_map_t** maps;
534  size_t num_maps;
535  ASSERT_EQ(0, pm_process_maps(process, &maps, &num_maps));
536
537  size_t total_pss = 0;
538  for (size_t i = 0; i < num_maps; i++) {
539    pm_memusage_t usage;
540    ASSERT_EQ(0, pm_map_usage(maps[i], &usage));
541    total_pss += usage.pss;
542  }
543  *pss_out = total_pss;
544
545  free(maps);
546  pm_process_destroy(process);
547  pm_kernel_destroy(kernel);
548}
549
550void DlExtRelroSharingTest::SpawnChildrenAndMeasurePss(const char* lib, bool share_relro,
551                                                       size_t* pss_out) {
552  const int CHILDREN = 20;
553
554  // Create children
555  pid_t child_pids[CHILDREN];
556  int childpipe[CHILDREN];
557  for (int i=0; i<CHILDREN; ++i) {
558    char read_buf;
559    int child_done_pipe[2], parent_done_pipe[2];
560    ASSERT_NOERROR(pipe(child_done_pipe));
561    ASSERT_NOERROR(pipe(parent_done_pipe));
562
563    pid_t child = fork();
564    if (child == 0) {
565      // close the 'wrong' ends of the pipes in the child
566      close(child_done_pipe[0]);
567      close(parent_done_pipe[1]);
568
569      // open the library
570      void* handle;
571      if (share_relro) {
572        handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo_);
573      } else {
574        handle = dlopen(lib, RTLD_NOW);
575      }
576      if (handle == nullptr) {
577        fprintf(stderr, "in child: %s\n", dlerror());
578        exit(1);
579      }
580
581      // close write end of child_done_pipe to signal the parent that we're done.
582      close(child_done_pipe[1]);
583
584      // wait for the parent to close parent_done_pipe, then exit
585      read(parent_done_pipe[0], &read_buf, 1);
586      exit(0);
587    }
588
589    ASSERT_NOERROR(child);
590
591    // close the 'wrong' ends of the pipes in the parent
592    close(child_done_pipe[1]);
593    close(parent_done_pipe[0]);
594
595    // wait for the child to be done
596    read(child_done_pipe[0], &read_buf, 1);
597    close(child_done_pipe[0]);
598
599    // save the child's pid and the parent_done_pipe
600    child_pids[i] = child;
601    childpipe[i] = parent_done_pipe[1];
602  }
603
604  // Sum the PSS of all the children
605  size_t total_pss = 0;
606  for (int i=0; i<CHILDREN; ++i) {
607    size_t child_pss;
608    ASSERT_NO_FATAL_FAILURE(getPss(child_pids[i], &child_pss));
609    total_pss += child_pss;
610  }
611  *pss_out = total_pss;
612
613  // Close pipes and wait for children to exit
614  for (int i=0; i<CHILDREN; ++i) {
615    ASSERT_NOERROR(close(childpipe[i]));
616  }
617  for (int i = 0; i < CHILDREN; ++i) {
618    AssertChildExited(child_pids[i], 0);
619  }
620}
621
622// Testing namespaces
623static const char* g_public_lib = "libnstest_public.so";
624
625TEST(dlext, ns_smoke) {
626  static const char* root_lib = "libnstest_root.so";
627  std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
628
629  ASSERT_FALSE(android_init_namespaces(path.c_str(), nullptr));
630  ASSERT_STREQ("android_init_namespaces failed: error initializing public namespace: "
631               "\"libnstest_public.so\" was not found in the default namespace", dlerror());
632
633  ASSERT_FALSE(android_init_namespaces("", nullptr));
634  ASSERT_STREQ("android_init_namespaces failed: error initializing public namespace: "
635               "the list of public libraries is empty.", dlerror());
636
637  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
638
639  const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
640  void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
641  ASSERT_TRUE(handle_public != nullptr) << dlerror();
642
643  ASSERT_TRUE(android_init_namespaces(path.c_str(), nullptr)) << dlerror();
644
645  // Check that libraries added to public namespace are NODELETE
646  dlclose(handle_public);
647  handle_public = dlopen((lib_path + "/public_namespace_libs/" + g_public_lib).c_str(),
648                         RTLD_NOW | RTLD_NOLOAD);
649
650  ASSERT_TRUE(handle_public != nullptr) << dlerror();
651
652  android_namespace_t* ns1 =
653          android_create_namespace("private", nullptr,
654                                   (lib_path + "/private_namespace_libs").c_str(),
655                                   ANDROID_NAMESPACE_TYPE_REGULAR, nullptr);
656  ASSERT_TRUE(ns1 != nullptr) << dlerror();
657
658  android_namespace_t* ns2 =
659          android_create_namespace("private_isolated", nullptr,
660                                   (lib_path + "/private_namespace_libs").c_str(),
661                                   ANDROID_NAMESPACE_TYPE_ISOLATED, nullptr);
662  ASSERT_TRUE(ns2 != nullptr) << dlerror();
663
664  // This should not have affect search path for default namespace:
665  ASSERT_TRUE(dlopen(root_lib, RTLD_NOW) == nullptr);
666  void* handle = dlopen(g_public_lib, RTLD_NOW);
667  ASSERT_TRUE(handle != nullptr) << dlerror();
668  dlclose(handle);
669
670  android_dlextinfo extinfo;
671  extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
672  extinfo.library_namespace = ns1;
673
674  void* handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
675  ASSERT_TRUE(handle1 != nullptr) << dlerror();
676
677  extinfo.library_namespace = ns2;
678  void* handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
679  ASSERT_TRUE(handle2 != nullptr) << dlerror();
680
681  ASSERT_TRUE(handle1 != handle2);
682
683  // dlopen for a public library using an absolute path should work for isolated namespaces
684  extinfo.library_namespace = ns2;
685  handle = android_dlopen_ext(lib_public_path.c_str(), RTLD_NOW, &extinfo);
686  ASSERT_TRUE(handle != nullptr) << dlerror();
687  ASSERT_TRUE(handle == handle_public);
688
689  dlclose(handle);
690
691  typedef const char* (*fn_t)();
692
693  fn_t ns_get_local_string1 = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_local_string"));
694  ASSERT_TRUE(ns_get_local_string1 != nullptr) << dlerror();
695  fn_t ns_get_local_string2 = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_local_string"));
696  ASSERT_TRUE(ns_get_local_string2 != nullptr) << dlerror();
697
698  EXPECT_STREQ("This string is local to root library", ns_get_local_string1());
699  EXPECT_STREQ("This string is local to root library", ns_get_local_string2());
700
701  ASSERT_TRUE(ns_get_local_string1() != ns_get_local_string2());
702
703  fn_t ns_get_private_extern_string1 =
704          reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_private_extern_string"));
705  ASSERT_TRUE(ns_get_private_extern_string1 != nullptr) << dlerror();
706  fn_t ns_get_private_extern_string2 =
707          reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_private_extern_string"));
708  ASSERT_TRUE(ns_get_private_extern_string2 != nullptr) << dlerror();
709
710  EXPECT_STREQ("This string is from private namespace", ns_get_private_extern_string1());
711  EXPECT_STREQ("This string is from private namespace", ns_get_private_extern_string2());
712
713  ASSERT_TRUE(ns_get_private_extern_string1() != ns_get_private_extern_string2());
714
715  fn_t ns_get_public_extern_string1 =
716          reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_public_extern_string"));
717  ASSERT_TRUE(ns_get_public_extern_string1 != nullptr) << dlerror();
718  fn_t ns_get_public_extern_string2 =
719          reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_public_extern_string"));
720  ASSERT_TRUE(ns_get_public_extern_string2 != nullptr) << dlerror();
721
722  EXPECT_STREQ("This string is from public namespace", ns_get_public_extern_string1());
723  ASSERT_TRUE(ns_get_public_extern_string1() == ns_get_public_extern_string2());
724
725  // and now check that dlopen() does the right thing in terms of preserving namespace
726  fn_t ns_get_dlopened_string1 = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_dlopened_string"));
727  ASSERT_TRUE(ns_get_dlopened_string1 != nullptr) << dlerror();
728  fn_t ns_get_dlopened_string2 = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_dlopened_string"));
729  ASSERT_TRUE(ns_get_dlopened_string2 != nullptr) << dlerror();
730
731  EXPECT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string1());
732  EXPECT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string2());
733
734  ASSERT_TRUE(ns_get_dlopened_string1() != ns_get_dlopened_string2());
735
736  dlclose(handle1);
737
738  // Check if handle2 is still alive (and well)
739  ASSERT_STREQ("This string is local to root library", ns_get_local_string2());
740  ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string2());
741  ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string2());
742  ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string2());
743
744  dlclose(handle2);
745}
746
747TEST(dlext, ns_isolated) {
748  static const char* root_lib = "libnstest_root_not_isolated.so";
749  std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
750
751  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
752  const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
753  void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
754  ASSERT_TRUE(handle_public != nullptr) << dlerror();
755
756  android_set_application_target_sdk_version(42U); // something > 23
757
758  ASSERT_TRUE(android_init_namespaces(path.c_str(), nullptr)) << dlerror();
759
760  android_namespace_t* ns_not_isolated =
761          android_create_namespace("private", nullptr,
762                                   (lib_path + "/private_namespace_libs").c_str(),
763                                   ANDROID_NAMESPACE_TYPE_REGULAR, nullptr);
764  ASSERT_TRUE(ns_not_isolated != nullptr) << dlerror();
765
766  android_namespace_t* ns_isolated =
767          android_create_namespace("private_isolated1", nullptr,
768                                   (lib_path + "/private_namespace_libs").c_str(),
769                                   ANDROID_NAMESPACE_TYPE_ISOLATED, nullptr);
770  ASSERT_TRUE(ns_isolated != nullptr) << dlerror();
771
772  android_namespace_t* ns_isolated2 =
773          android_create_namespace("private_isolated2",
774                                   (lib_path + "/private_namespace_libs").c_str(),
775                                   nullptr, ANDROID_NAMESPACE_TYPE_ISOLATED, lib_path.c_str());
776  ASSERT_TRUE(ns_isolated2 != nullptr) << dlerror();
777
778  ASSERT_TRUE(dlopen(root_lib, RTLD_NOW) == nullptr);
779  ASSERT_STREQ("dlopen failed: library \"libnstest_root_not_isolated.so\" not found", dlerror());
780
781  std::string lib_private_external_path =
782      lib_path + "/private_namespace_libs_external/libnstest_private_external.so";
783
784  // Load lib_private_external_path to default namespace
785  // (it should remain invisible for the isolated namespaces after this)
786  void* handle = dlopen(lib_private_external_path.c_str(), RTLD_NOW);
787  ASSERT_TRUE(handle != nullptr) << dlerror();
788
789  android_dlextinfo extinfo;
790  extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
791  extinfo.library_namespace = ns_not_isolated;
792
793  void* handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
794  ASSERT_TRUE(handle1 != nullptr) << dlerror();
795
796  extinfo.library_namespace = ns_isolated;
797
798  void* handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
799  ASSERT_TRUE(handle2 == nullptr);
800  ASSERT_STREQ("dlopen failed: library \"libnstest_private_external.so\" not found", dlerror());
801
802  // Check dlopen by absolute path
803  handle2 = android_dlopen_ext(lib_private_external_path.c_str(), RTLD_NOW, &extinfo);
804  ASSERT_TRUE(handle2 == nullptr);
805  ASSERT_EQ("dlopen failed: library \"" + lib_private_external_path + "\" needed"
806            " or dlopened by \"" + get_executable_path() +  "\" is not accessible"
807            " for the namespace \"private_isolated1\"", dlerror());
808
809  extinfo.library_namespace = ns_isolated2;
810
811  // this should work because isolation_path for private_isolated2 includes lib_path
812  handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
813  ASSERT_TRUE(handle2 != nullptr) << dlerror();
814  dlclose(handle2);
815
816  // Check dlopen by absolute path
817  handle2 = android_dlopen_ext(lib_private_external_path.c_str(), RTLD_NOW, &extinfo);
818  ASSERT_TRUE(handle2 != nullptr) << dlerror();
819  dlclose(handle2);
820
821  typedef const char* (*fn_t)();
822  fn_t ns_get_local_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_local_string"));
823  ASSERT_TRUE(ns_get_local_string != nullptr) << dlerror();
824
825  ASSERT_STREQ("This string is local to root library", ns_get_local_string());
826
827  fn_t ns_get_private_extern_string =
828          reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_private_extern_string"));
829  ASSERT_TRUE(ns_get_private_extern_string != nullptr) << dlerror();
830
831  ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string());
832
833  fn_t ns_get_public_extern_string =
834          reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_public_extern_string"));
835  ASSERT_TRUE(ns_get_public_extern_string != nullptr) << dlerror();
836
837  ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string());
838
839  fn_t ns_get_dlopened_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_dlopened_string"));
840  ASSERT_TRUE(ns_get_dlopened_string != nullptr) << dlerror();
841
842  ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string());
843
844  dlclose(handle1);
845}
846
847TEST(dlext, ns_shared) {
848  static const char* root_lib = "libnstest_root_not_isolated.so";
849  static const char* root_lib_isolated = "libnstest_root.so";
850  std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
851
852  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
853  const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
854  void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
855  ASSERT_TRUE(handle_public != nullptr) << dlerror();
856
857  android_set_application_target_sdk_version(42U); // something > 23
858
859  ASSERT_TRUE(android_init_namespaces(path.c_str(), nullptr)) << dlerror();
860
861  // preload this library to the default namespace to check if it
862  // is shared later on.
863  void* handle_dlopened =
864          dlopen((lib_path + "/private_namespace_libs/libnstest_dlopened.so").c_str(), RTLD_NOW);
865  ASSERT_TRUE(handle_dlopened != nullptr) << dlerror();
866
867  android_namespace_t* ns_not_isolated =
868          android_create_namespace("private", nullptr,
869                                   (lib_path + "/private_namespace_libs").c_str(),
870                                   ANDROID_NAMESPACE_TYPE_REGULAR, nullptr);
871  ASSERT_TRUE(ns_not_isolated != nullptr) << dlerror();
872
873  android_namespace_t* ns_isolated_shared =
874          android_create_namespace("private_isolated_shared", nullptr,
875                                   (lib_path + "/private_namespace_libs").c_str(),
876                                   ANDROID_NAMESPACE_TYPE_ISOLATED | ANDROID_NAMESPACE_TYPE_SHARED,
877                                   nullptr);
878  ASSERT_TRUE(ns_isolated_shared != nullptr) << dlerror();
879
880  ASSERT_TRUE(dlopen(root_lib, RTLD_NOW) == nullptr);
881  ASSERT_STREQ("dlopen failed: library \"libnstest_root_not_isolated.so\" not found", dlerror());
882
883  std::string lib_private_external_path =
884      lib_path + "/private_namespace_libs_external/libnstest_private_external.so";
885
886  // Load lib_private_external_path to default namespace
887  // (it should remain invisible for the isolated namespaces after this)
888  void* handle = dlopen(lib_private_external_path.c_str(), RTLD_NOW);
889  ASSERT_TRUE(handle != nullptr) << dlerror();
890
891  android_dlextinfo extinfo;
892  extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
893  extinfo.library_namespace = ns_not_isolated;
894
895  void* handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
896  ASSERT_TRUE(handle1 != nullptr) << dlerror();
897
898  extinfo.library_namespace = ns_isolated_shared;
899
900  void* handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
901  ASSERT_TRUE(handle2 == nullptr);
902  ASSERT_STREQ("dlopen failed: library \"libnstest_private_external.so\" not found", dlerror());
903
904  // Check dlopen by absolute path
905  handle2 = android_dlopen_ext(lib_private_external_path.c_str(), RTLD_NOW, &extinfo);
906  ASSERT_TRUE(handle2 == nullptr);
907  ASSERT_EQ("dlopen failed: library \"" + lib_private_external_path + "\" needed"
908            " or dlopened by \"" + get_executable_path() + "\" is not accessible"
909            " for the namespace \"private_isolated_shared\"", dlerror());
910
911  // load libnstest_root.so to shared namespace in order to check that everything is different
912  // except shared libnstest_dlopened.so
913
914  handle2 = android_dlopen_ext(root_lib_isolated, RTLD_NOW, &extinfo);
915
916  typedef const char* (*fn_t)();
917  fn_t ns_get_local_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_local_string"));
918  ASSERT_TRUE(ns_get_local_string != nullptr) << dlerror();
919  fn_t ns_get_local_string_shared = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_local_string"));
920  ASSERT_TRUE(ns_get_local_string_shared != nullptr) << dlerror();
921
922  ASSERT_STREQ("This string is local to root library", ns_get_local_string());
923  ASSERT_STREQ("This string is local to root library", ns_get_local_string_shared());
924  ASSERT_TRUE(ns_get_local_string() != ns_get_local_string_shared());
925
926  fn_t ns_get_private_extern_string =
927          reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_private_extern_string"));
928  ASSERT_TRUE(ns_get_private_extern_string != nullptr) << dlerror();
929  fn_t ns_get_private_extern_string_shared =
930          reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_private_extern_string"));
931  ASSERT_TRUE(ns_get_private_extern_string_shared() != nullptr) << dlerror();
932
933  ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string());
934  ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string_shared());
935  ASSERT_TRUE(ns_get_private_extern_string() != ns_get_private_extern_string_shared());
936
937  fn_t ns_get_public_extern_string =
938          reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_public_extern_string"));
939  ASSERT_TRUE(ns_get_public_extern_string != nullptr) << dlerror();
940  fn_t ns_get_public_extern_string_shared =
941          reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_public_extern_string"));
942  ASSERT_TRUE(ns_get_public_extern_string_shared != nullptr) << dlerror();
943
944  ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string());
945  ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string_shared());
946  ASSERT_TRUE(ns_get_public_extern_string() == ns_get_public_extern_string_shared());
947
948  fn_t ns_get_dlopened_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_dlopened_string"));
949  ASSERT_TRUE(ns_get_dlopened_string != nullptr) << dlerror();
950  fn_t ns_get_dlopened_string_shared = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_dlopened_string"));
951  ASSERT_TRUE(ns_get_dlopened_string_shared != nullptr) << dlerror();
952  const char** ns_dlopened_string = static_cast<const char**>(dlsym(handle_dlopened, "g_private_dlopened_string"));
953  ASSERT_TRUE(ns_dlopened_string != nullptr) << dlerror();
954
955  ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string());
956  ASSERT_STREQ("This string is from private namespace (dlopened library)", *ns_dlopened_string);
957  ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string_shared());
958  ASSERT_TRUE(ns_get_dlopened_string() != ns_get_dlopened_string_shared());
959  ASSERT_TRUE(*ns_dlopened_string == ns_get_dlopened_string_shared());
960
961  dlclose(handle1);
962  dlclose(handle2);
963}
964
965TEST(dlext, ns_shared_dlclose) {
966  std::string path = "libc.so:libc++.so:libdl.so:libm.so";
967
968  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
969
970  android_set_application_target_sdk_version(42U); // something > 23
971
972  ASSERT_TRUE(android_init_namespaces(path.c_str(), nullptr)) << dlerror();
973
974  // preload this library to the default namespace to check if it
975  // is shared later on.
976  void* handle_dlopened =
977          dlopen((lib_path + "/private_namespace_libs/libnstest_dlopened.so").c_str(), RTLD_NOW);
978  ASSERT_TRUE(handle_dlopened != nullptr) << dlerror();
979
980  android_namespace_t* ns_isolated_shared =
981          android_create_namespace("private_isolated_shared", nullptr,
982                                   (lib_path + "/private_namespace_libs").c_str(),
983                                   ANDROID_NAMESPACE_TYPE_ISOLATED | ANDROID_NAMESPACE_TYPE_SHARED,
984                                   nullptr);
985  ASSERT_TRUE(ns_isolated_shared != nullptr) << dlerror();
986
987  // Check if "libnstest_dlopened.so" is loaded (and the same)
988  android_dlextinfo extinfo;
989  extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
990  extinfo.library_namespace = ns_isolated_shared;
991
992  void* handle = android_dlopen_ext("libnstest_dlopened.so", RTLD_NOW | RTLD_NOLOAD, &extinfo);
993  ASSERT_TRUE(handle != nullptr) << dlerror();
994  ASSERT_TRUE(handle == handle_dlopened);
995  dlclose(handle);
996  dlclose(handle_dlopened);
997
998  // And now check that the library cannot be found by soname (and is no longer loaded)
999  handle = android_dlopen_ext("libnstest_dlopened.so", RTLD_NOW | RTLD_NOLOAD, &extinfo);
1000  ASSERT_TRUE(handle == nullptr)
1001      << "Error: libnstest_dlopened.so is still accessible in shared namespace";
1002
1003  handle = android_dlopen_ext((lib_path + "/private_namespace_libs/libnstest_dlopened.so").c_str(),
1004                              RTLD_NOW | RTLD_NOLOAD, &extinfo);
1005  ASSERT_TRUE(handle == nullptr)
1006      << "Error: libnstest_dlopened.so is still accessible in shared namespace";
1007
1008  handle = dlopen("libnstest_dlopened.so", RTLD_NOW | RTLD_NOLOAD);
1009  ASSERT_TRUE(handle == nullptr)
1010      << "Error: libnstest_dlopened.so is still accessible in default namespace";
1011
1012  handle = dlopen((lib_path + "/private_namespace_libs/libnstest_dlopened.so").c_str(),
1013                  RTLD_NOW | RTLD_NOLOAD);
1014  ASSERT_TRUE(handle == nullptr)
1015      << "Error: libnstest_dlopened.so is still accessible in default namespace";
1016
1017  // Now lets see if the soinfo area gets reused in the wrong way:
1018  // load a library to default namespace.
1019  const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
1020  void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
1021  ASSERT_TRUE(handle_public != nullptr) << dlerror();
1022
1023  // try to find it in shared namespace
1024  handle = android_dlopen_ext(g_public_lib, RTLD_NOW | RTLD_NOLOAD, &extinfo);
1025  ASSERT_TRUE(handle == nullptr)
1026      << "Error: " << g_public_lib << " is accessible in shared namespace";
1027}
1028
1029TEST(dlext, ns_anonymous) {
1030  static const char* root_lib = "libnstest_root.so";
1031  std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
1032
1033  const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
1034
1035  const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
1036  void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
1037
1038  ASSERT_TRUE(handle_public != nullptr) << dlerror();
1039
1040  ASSERT_TRUE(android_init_namespaces(path.c_str(), (lib_path + "/private_namespace_libs").c_str()))
1041      << dlerror();
1042
1043  android_namespace_t* ns = android_create_namespace(
1044                                "private", nullptr,
1045                                (lib_path + "/private_namespace_libs").c_str(),
1046                                ANDROID_NAMESPACE_TYPE_REGULAR, nullptr);
1047
1048  ASSERT_TRUE(ns != nullptr) << dlerror();
1049
1050  std::string private_library_absolute_path = lib_path + "/private_namespace_libs/" + root_lib;
1051
1052  android_dlextinfo extinfo;
1053  extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
1054  extinfo.library_namespace = ns;
1055
1056  // we are going to copy this library to anonymous mmap and call the copy of ns_get_dlopened_string
1057  void* handle = android_dlopen_ext(private_library_absolute_path.c_str(), RTLD_NOW, &extinfo);
1058  ASSERT_TRUE(handle != nullptr) << dlerror();
1059
1060  uintptr_t ns_get_dlopened_string_addr =
1061      reinterpret_cast<uintptr_t>(dlsym(handle, "ns_get_dlopened_string"));
1062  ASSERT_TRUE(ns_get_dlopened_string_addr != 0) << dlerror();
1063  typedef const char* (*fn_t)();
1064  fn_t ns_get_dlopened_string_private = reinterpret_cast<fn_t>(ns_get_dlopened_string_addr);
1065
1066  std::vector<map_record> maps;
1067  Maps::parse_maps(&maps);
1068
1069  uintptr_t addr_start = 0;
1070  uintptr_t addr_end = 0;
1071  std::vector<map_record> maps_to_copy;
1072
1073  for (const auto& rec : maps) {
1074    if (rec.pathname == private_library_absolute_path) {
1075      if (addr_start == 0) {
1076        addr_start = rec.addr_start;
1077      }
1078      addr_end = rec.addr_end;
1079
1080      maps_to_copy.push_back(rec);
1081    }
1082  }
1083
1084  // some sanity checks..
1085  ASSERT_TRUE(addr_start > 0);
1086  ASSERT_TRUE(addr_end > 0);
1087  ASSERT_EQ(3U, maps_to_copy.size());
1088  ASSERT_TRUE(ns_get_dlopened_string_addr > addr_start);
1089  ASSERT_TRUE(ns_get_dlopened_string_addr < addr_end);
1090
1091  // copy
1092  uintptr_t reserved_addr = reinterpret_cast<uintptr_t>(mmap(nullptr, addr_end - addr_start,
1093                                                             PROT_NONE, MAP_ANON | MAP_PRIVATE,
1094                                                             -1, 0));
1095  ASSERT_TRUE(reinterpret_cast<void*>(reserved_addr) != MAP_FAILED);
1096
1097  for (const auto& rec : maps_to_copy) {
1098    uintptr_t offset = rec.addr_start - addr_start;
1099    size_t size = rec.addr_end - rec.addr_start;
1100    void* addr = reinterpret_cast<void*>(reserved_addr + offset);
1101    void* map = mmap(addr, size, PROT_READ | PROT_WRITE,
1102                     MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0);
1103    ASSERT_TRUE(map != MAP_FAILED);
1104    memcpy(map, reinterpret_cast<void*>(rec.addr_start), size);
1105    mprotect(map, size, rec.perms);
1106  }
1107
1108  // call the function copy
1109  uintptr_t ns_get_dlopened_string_offset  = ns_get_dlopened_string_addr - addr_start;
1110  fn_t ns_get_dlopened_string_anon = reinterpret_cast<fn_t>(reserved_addr + ns_get_dlopened_string_offset);
1111  ASSERT_STREQ("This string is from private namespace (dlopened library)",
1112               ns_get_dlopened_string_anon());
1113
1114  // They should belong to different namespaces (private and anonymous)
1115  ASSERT_STREQ("This string is from private namespace (dlopened library)",
1116               ns_get_dlopened_string_private());
1117
1118  ASSERT_TRUE(ns_get_dlopened_string_anon() != ns_get_dlopened_string_private());
1119}
1120
1121TEST(dlext, dlopen_handle_value_platform) {
1122  void* handle = dlopen("libtest_dlsym_from_this.so", RTLD_NOW | RTLD_LOCAL);
1123  ASSERT_TRUE((reinterpret_cast<uintptr_t>(handle) & 1) != 0)
1124          << "dlopen should return odd value for the handle";
1125  dlclose(handle);
1126}
1127
1128TEST(dlext, dlopen_handle_value_app_compat) {
1129  android_set_application_target_sdk_version(23);
1130  void* handle = dlopen("libtest_dlsym_from_this.so", RTLD_NOW | RTLD_LOCAL);
1131  ASSERT_TRUE(reinterpret_cast<uintptr_t>(handle) % sizeof(uintptr_t) == 0)
1132          << "dlopen should return valid pointer";
1133  dlclose(handle);
1134}
1135
1136