TEST_F(DlExtTest, ExtInfoUseFdWithInvalidOffset) {
const char* android_data = getenv("ANDROID_DATA");
ASSERT_TRUE(android_data != nullptr);
char lib_path[PATH_MAX];
snprintf(lib_path, sizeof(lib_path), LIBZIPPATH, android_data);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD | ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET;
extinfo.library_fd = TEMP_FAILURE_RETRY(open(lib_path, O_RDONLY | O_CLOEXEC));
extinfo.library_fd_offset = 17;
handle_ = android_dlopen_ext("libname_placeholder", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
ASSERT_STREQ("dlopen failed: file offset for the library \"libname_placeholder\" is not page-aligned: 17", dlerror());
extinfo.library_fd_offset = (5LL<<58) + PAGE_SIZE;
handle_ = android_dlopen_ext("libname_placeholder", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
// TODO: Better error message when reading with offset > file_size
ASSERT_STREQ("dlopen failed: \"libname_placeholder\" has bad ELF magic", dlerror());
close(extinfo.library_fd);
}
void CreateRelroFile(const char* lib) {
int relro_fd = open(relro_file_, O_CREAT | O_RDWR | O_TRUNC, 0644);
ASSERT_NOERROR(relro_fd);
pid_t pid = fork();
if (pid == 0) {
// child process
extinfo_.flags |= ANDROID_DLEXT_WRITE_RELRO;
extinfo_.relro_fd = relro_fd;
void* handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo_);
if (handle == nullptr) {
fprintf(stderr, "in child: %s\n", dlerror());
exit(1);
}
exit(0);
}
// continuing in parent
ASSERT_NOERROR(close(relro_fd));
ASSERT_NOERROR(pid);
int status;
ASSERT_EQ(pid, waitpid(pid, &status, 0));
ASSERT_TRUE(WIFEXITED(status));
ASSERT_EQ(0, WEXITSTATUS(status));
// reopen file for reading so it can be used
relro_fd = open(relro_file_, O_RDONLY);
ASSERT_NOERROR(relro_fd);
extinfo_.flags |= ANDROID_DLEXT_USE_RELRO;
extinfo_.relro_fd = relro_fd;
}
void* OpenNativeLibrary(JNIEnv* env,
int32_t target_sdk_version,
const char* path,
jobject class_loader,
jstring library_path) {
#if defined(__ANDROID__)
if (!namespaces_enabled(target_sdk_version) || class_loader == nullptr) {
return dlopen(path, RTLD_NOW);
}
std::lock_guard<std::mutex> guard(g_namespaces_mutex);
android_namespace_t* ns = g_namespaces->FindNamespaceByClassLoader(env, class_loader);
if (ns == nullptr) {
// This is the case where the classloader was not created by ApplicationLoaders
// In this case we create an isolated not-shared namespace for it.
ns = g_namespaces->Create(env, class_loader, false, library_path, nullptr);
if (ns == nullptr) {
return nullptr;
}
}
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns;
return android_dlopen_ext(path, RTLD_NOW, &extinfo);
#else
UNUSED(env, target_sdk_version, class_loader, library_path);
return dlopen(path, RTLD_NOW);
#endif
}
void CreateRelroFile(const char* lib, const char* relro_file) {
int relro_fd = open(relro_file, O_RDWR | O_TRUNC);
ASSERT_NOERROR(relro_fd);
pid_t pid = fork();
if (pid == 0) {
// child process
extinfo_.flags |= ANDROID_DLEXT_WRITE_RELRO;
extinfo_.relro_fd = relro_fd;
void* handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo_);
if (handle == nullptr) {
fprintf(stderr, "in child: %s\n", dlerror());
exit(1);
}
exit(0);
}
// continuing in parent
ASSERT_NOERROR(close(relro_fd));
ASSERT_NOERROR(pid);
AssertChildExited(pid, 0);
// reopen file for reading so it can be used
relro_fd = open(relro_file, O_RDONLY);
ASSERT_NOERROR(relro_fd);
extinfo_.flags |= ANDROID_DLEXT_USE_RELRO;
extinfo_.relro_fd = relro_fd;
}
void TryUsingRelro(const char* lib) {
handle_ = android_dlopen_ext(lib, RTLD_NOW, &extinfo_);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(4, f());
}
TEST_F(DlExtTest, ExtInfoNull) {
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, nullptr);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(4, f());
}
TEST_F(DlExtTest, ExtInfoUseFdWithOffset) {
const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBZIPPATH;
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD | ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET;
extinfo.library_fd = TEMP_FAILURE_RETRY(open(lib_path.c_str(), O_RDONLY | O_CLOEXEC));
// Find the offset of the shared library in the zip.
ZipArchiveHandle handle;
ASSERT_EQ(0, OpenArchive(lib_path.c_str(), &handle));
ZipEntry zip_entry;
ZipString zip_name;
zip_name.name = reinterpret_cast<const uint8_t*>(LIBZIP_SIMPLE_ZIP);
zip_name.name_length = sizeof(LIBZIP_SIMPLE_ZIP) - 1;
ASSERT_EQ(0, FindEntry(handle, zip_name, &zip_entry));
extinfo.library_fd_offset = zip_entry.offset;
CloseArchive(handle);
handle_ = android_dlopen_ext(lib_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
uint32_t* taxicab_number = reinterpret_cast<uint32_t*>(dlsym(handle_, "dlopen_testlib_taxicab_number"));
ASSERT_DL_NOTNULL(taxicab_number);
EXPECT_EQ(1729U, *taxicab_number);
}
void* OpenNativeLibrary(JNIEnv* env, int32_t target_sdk_version, const char* path,
jobject class_loader, bool is_shared, jstring java_library_path,
jstring java_permitted_path) {
#if defined(__ANDROID__)
if (target_sdk_version == 0 || class_loader == nullptr) {
return dlopen(path, RTLD_NOW);
}
android_namespace_t* ns =
g_namespaces->GetOrCreate(env, class_loader, is_shared,
java_library_path, java_permitted_path);
if (ns == nullptr) {
return nullptr;
}
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns;
return android_dlopen_ext(path, RTLD_NOW, &extinfo);
#else
UNUSED(env, target_sdk_version, class_loader, is_shared,
java_library_path, java_permitted_path);
return dlopen(path, RTLD_NOW);
#endif
}
TEST_F(DlExtTest, ExtInfoUseOffsetWihtoutFd) {
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET;
extinfo.library_fd_offset = LIBZIP_OFFSET;
handle_ = android_dlopen_ext("/some/lib/that/does_not_exist", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
ASSERT_STREQ("dlopen failed: invalid extended flag combination (ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET without ANDROID_DLEXT_USE_LIBRARY_FD): 0x20", dlerror());
}
TEST_F(DlExtTest, ExtInfoNoFlags) {
android_dlextinfo extinfo;
extinfo.flags = 0;
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(4, f());
}
TEST_F(DlExtTest, ReservedTooSmall) {
void* start = mmap(nullptr, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(start != MAP_FAILED);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS;
extinfo.reserved_addr = start;
extinfo.reserved_size = PAGE_SIZE;
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
EXPECT_EQ(nullptr, handle_);
}
void TryUsingRelro(const char* lib) {
handle_ = android_dlopen_ext(lib, RTLD_NOW, &extinfo_);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(4, f());
uint32_t* taxicab_number =
reinterpret_cast<uint32_t*>(dlsym(handle_, "dlopen_testlib_taxicab_number"));
ASSERT_DL_NOTNULL(taxicab_number);
EXPECT_EQ(1729U, *taxicab_number);
}
TEST_F(DlExtTest, ExtInfoUseFdWithInvalidOffset) {
const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBZIPPATH;
// lib_path is relative when $ANDROID_DATA is relative
char lib_realpath_buf[PATH_MAX];
ASSERT_TRUE(realpath(lib_path.c_str(), lib_realpath_buf) == lib_realpath_buf);
const std::string lib_realpath = std::string(lib_realpath_buf);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD | ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET;
extinfo.library_fd = TEMP_FAILURE_RETRY(open(lib_path.c_str(), O_RDONLY | O_CLOEXEC));
extinfo.library_fd_offset = 17;
handle_ = android_dlopen_ext("libname_placeholder", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
ASSERT_STREQ("dlopen failed: file offset for the library \"libname_placeholder\" is not page-aligned: 17", dlerror());
// Test an address above 2^44, for http://b/18178121 .
extinfo.library_fd_offset = (5LL<<48) + PAGE_SIZE;
handle_ = android_dlopen_ext("libname_placeholder", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
ASSERT_SUBSTR("dlopen failed: file offset for the library \"libname_placeholder\" >= file size", dlerror());
extinfo.library_fd_offset = 0LL - PAGE_SIZE;
handle_ = android_dlopen_ext("libname_placeholder", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
ASSERT_SUBSTR("dlopen failed: file offset for the library \"libname_placeholder\" is negative", dlerror());
extinfo.library_fd_offset = 0;
handle_ = android_dlopen_ext("libname_ignored", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
ASSERT_EQ("dlopen failed: \"" + lib_realpath + "\" has bad ELF magic", dlerror());
// Check if dlsym works after unsuccessful dlopen().
// Supply non-exiting one to make linker visit every soinfo.
void* sym = dlsym(RTLD_DEFAULT, "this_symbol_does_not_exist___");
ASSERT_TRUE(sym == nullptr);
close(extinfo.library_fd);
}
TEST(dlext, android_dlopen_ext_force_load_smoke) {
// 1. Open actual file
void* handle = dlopen("libdlext_test.so", RTLD_NOW);
ASSERT_DL_NOTNULL(handle);
// 2. Open link with force_load flag set
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_FORCE_LOAD;
void* handle2 = android_dlopen_ext("libdlext_test_v2.so", RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle2);
ASSERT_TRUE(handle != handle2);
dlclose(handle2);
dlclose(handle);
}
TEST_F(DlExtTest, LoadAtFixedAddressTooSmall) {
void* start = mmap(nullptr, LIBSIZE + PAGE_SIZE, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(start != MAP_FAILED);
munmap(start, LIBSIZE + PAGE_SIZE);
void* new_addr = mmap(reinterpret_cast<uint8_t*>(start) + PAGE_SIZE, LIBSIZE, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(new_addr != MAP_FAILED);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS;
extinfo.reserved_addr = start;
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_ == nullptr);
}
TEST_F(DlExtTest, ExtInfoUseFd) {
const char* android_data = getenv("ANDROID_DATA");
ASSERT_TRUE(android_data != nullptr);
char lib_path[PATH_MAX];
snprintf(lib_path, sizeof(lib_path), LIBPATH, android_data);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD;
extinfo.library_fd = TEMP_FAILURE_RETRY(open(lib_path, O_RDONLY | O_CLOEXEC));
ASSERT_TRUE(extinfo.library_fd != -1);
handle_ = android_dlopen_ext(lib_path, RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(4, f());
}
TEST_F(DlExtTest, ReservedHintTooSmall) {
void* start = mmap(nullptr, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
ASSERT_TRUE(start != MAP_FAILED);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS_HINT;
extinfo.reserved_addr = start;
extinfo.reserved_size = PAGE_SIZE;
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_TRUE(f < start || (reinterpret_cast<void*>(f) >=
reinterpret_cast<char*>(start) + PAGE_SIZE));
EXPECT_EQ(4, f());
}
TEST_F(DlExtTest, ExtInfoUseFd) {
const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBPATH;
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD;
extinfo.library_fd = TEMP_FAILURE_RETRY(open(lib_path.c_str(), O_RDONLY | O_CLOEXEC));
ASSERT_TRUE(extinfo.library_fd != -1);
handle_ = android_dlopen_ext(lib_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(4, f());
uint32_t* taxicab_number = reinterpret_cast<uint32_t*>(dlsym(handle_, "dlopen_testlib_taxicab_number"));
ASSERT_DL_NOTNULL(taxicab_number);
EXPECT_EQ(1729U, *taxicab_number);
}
TEST(dlext, android_dlopen_ext_force_load_soname_exception) {
// Check if soname lookup still returns already loaded library
// when ANDROID_DLEXT_FORCE_LOAD flag is specified.
void* handle = dlopen("libdlext_test_v2.so", RTLD_NOW);
ASSERT_DL_NOTNULL(handle);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_FORCE_LOAD;
// Note that 'libdlext_test.so' is dt_soname for libdlext_test_v2.so
void* handle2 = android_dlopen_ext("libdlext_test.so", RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle2);
ASSERT_TRUE(handle == handle2);
dlclose(handle2);
dlclose(handle);
}
TEST_F(DlExtTest, Reserved) {
void* start = mmap(nullptr, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(start != MAP_FAILED);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS;
extinfo.reserved_addr = start;
extinfo.reserved_size = LIBSIZE;
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_GE(reinterpret_cast<void*>(f), start);
EXPECT_LT(reinterpret_cast<void*>(f),
reinterpret_cast<char*>(start) + LIBSIZE);
EXPECT_EQ(4, f());
// Check that after dlclose reserved address space is unmapped (and can be reused)
dlclose(handle_);
handle_ = nullptr;
void* new_start = mmap(start, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_NE(start, new_start) << "dlclose unmapped reserved space";
}
TEST_F(DlExtTest, LoadAtFixedAddress) {
void* start = mmap(nullptr, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(start != MAP_FAILED);
munmap(start, LIBSIZE);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_LOAD_AT_FIXED_ADDRESS;
extinfo.reserved_addr = start;
handle_ = android_dlopen_ext(LIBNAME, RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_GE(reinterpret_cast<void*>(f), start);
EXPECT_LT(reinterpret_cast<void*>(f), reinterpret_cast<char*>(start) + LIBSIZE);
EXPECT_EQ(4, f());
dlclose(handle_);
handle_ = nullptr;
// Check that dlclose unmapped the file
void* addr = mmap(start, LIBSIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_EQ(start, addr) << "dlclose did not unmap the memory";
}
TEST(dlext, ns_smoke) {
static const char* root_lib = "libnstest_root.so";
std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
ASSERT_FALSE(android_init_namespaces(path.c_str(), nullptr));
ASSERT_STREQ("android_init_namespaces failed: error initializing public namespace: "
"\"libnstest_public.so\" was not found in the default namespace", dlerror());
ASSERT_FALSE(android_init_namespaces("", nullptr));
ASSERT_STREQ("android_init_namespaces failed: error initializing public namespace: "
"the list of public libraries is empty.", dlerror());
const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
ASSERT_TRUE(handle_public != nullptr) << dlerror();
ASSERT_TRUE(android_init_namespaces(path.c_str(), nullptr)) << dlerror();
// Check that libraries added to public namespace are NODELETE
dlclose(handle_public);
handle_public = dlopen((lib_path + "/public_namespace_libs/" + g_public_lib).c_str(),
RTLD_NOW | RTLD_NOLOAD);
ASSERT_TRUE(handle_public != nullptr) << dlerror();
android_namespace_t* ns1 =
android_create_namespace("private", nullptr,
(lib_path + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_REGULAR, nullptr);
ASSERT_TRUE(ns1 != nullptr) << dlerror();
android_namespace_t* ns2 =
android_create_namespace("private_isolated", nullptr,
(lib_path + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED, nullptr);
ASSERT_TRUE(ns2 != nullptr) << dlerror();
// This should not have affect search path for default namespace:
ASSERT_TRUE(dlopen(root_lib, RTLD_NOW) == nullptr);
void* handle = dlopen(g_public_lib, RTLD_NOW);
ASSERT_TRUE(handle != nullptr) << dlerror();
dlclose(handle);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns1;
void* handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle1 != nullptr) << dlerror();
extinfo.library_namespace = ns2;
void* handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle2 != nullptr) << dlerror();
ASSERT_TRUE(handle1 != handle2);
// dlopen for a public library using an absolute path should work for isolated namespaces
extinfo.library_namespace = ns2;
handle = android_dlopen_ext(lib_public_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
ASSERT_TRUE(handle == handle_public);
dlclose(handle);
typedef const char* (*fn_t)();
fn_t ns_get_local_string1 = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_local_string"));
ASSERT_TRUE(ns_get_local_string1 != nullptr) << dlerror();
fn_t ns_get_local_string2 = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_local_string"));
ASSERT_TRUE(ns_get_local_string2 != nullptr) << dlerror();
EXPECT_STREQ("This string is local to root library", ns_get_local_string1());
EXPECT_STREQ("This string is local to root library", ns_get_local_string2());
ASSERT_TRUE(ns_get_local_string1() != ns_get_local_string2());
fn_t ns_get_private_extern_string1 =
reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_private_extern_string"));
ASSERT_TRUE(ns_get_private_extern_string1 != nullptr) << dlerror();
fn_t ns_get_private_extern_string2 =
reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_private_extern_string"));
ASSERT_TRUE(ns_get_private_extern_string2 != nullptr) << dlerror();
EXPECT_STREQ("This string is from private namespace", ns_get_private_extern_string1());
EXPECT_STREQ("This string is from private namespace", ns_get_private_extern_string2());
ASSERT_TRUE(ns_get_private_extern_string1() != ns_get_private_extern_string2());
fn_t ns_get_public_extern_string1 =
reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_public_extern_string"));
ASSERT_TRUE(ns_get_public_extern_string1 != nullptr) << dlerror();
fn_t ns_get_public_extern_string2 =
reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_public_extern_string"));
ASSERT_TRUE(ns_get_public_extern_string2 != nullptr) << dlerror();
EXPECT_STREQ("This string is from public namespace", ns_get_public_extern_string1());
ASSERT_TRUE(ns_get_public_extern_string1() == ns_get_public_extern_string2());
// and now check that dlopen() does the right thing in terms of preserving namespace
fn_t ns_get_dlopened_string1 = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_dlopened_string"));
ASSERT_TRUE(ns_get_dlopened_string1 != nullptr) << dlerror();
fn_t ns_get_dlopened_string2 = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_dlopened_string"));
ASSERT_TRUE(ns_get_dlopened_string2 != nullptr) << dlerror();
EXPECT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string1());
EXPECT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string2());
ASSERT_TRUE(ns_get_dlopened_string1() != ns_get_dlopened_string2());
dlclose(handle1);
// Check if handle2 is still alive (and well)
ASSERT_STREQ("This string is local to root library", ns_get_local_string2());
ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string2());
ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string2());
ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string2());
dlclose(handle2);
}
void DlExtRelroSharingTest::SpawnChildrenAndMeasurePss(const char* lib, bool share_relro,
size_t* pss_out) {
const int CHILDREN = 20;
// Create children
pid_t childpid[CHILDREN];
int childpipe[CHILDREN];
for (int i=0; i<CHILDREN; ++i) {
char read_buf;
int child_done_pipe[2], parent_done_pipe[2];
ASSERT_NOERROR(pipe(child_done_pipe));
ASSERT_NOERROR(pipe(parent_done_pipe));
pid_t child = fork();
if (child == 0) {
// close the 'wrong' ends of the pipes in the child
close(child_done_pipe[0]);
close(parent_done_pipe[1]);
// open the library
void* handle;
if (share_relro) {
handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo_);
} else {
handle = dlopen(lib, RTLD_NOW);
}
if (handle == nullptr) {
fprintf(stderr, "in child: %s\n", dlerror());
exit(1);
}
// close write end of child_done_pipe to signal the parent that we're done.
close(child_done_pipe[1]);
// wait for the parent to close parent_done_pipe, then exit
read(parent_done_pipe[0], &read_buf, 1);
exit(0);
}
ASSERT_NOERROR(child);
// close the 'wrong' ends of the pipes in the parent
close(child_done_pipe[1]);
close(parent_done_pipe[0]);
// wait for the child to be done
read(child_done_pipe[0], &read_buf, 1);
close(child_done_pipe[0]);
// save the child's pid and the parent_done_pipe
childpid[i] = child;
childpipe[i] = parent_done_pipe[1];
}
// Sum the PSS of all the children
size_t total_pss = 0;
for (int i=0; i<CHILDREN; ++i) {
size_t child_pss;
ASSERT_NO_FATAL_FAILURE(getPss(childpid[i], &child_pss));
total_pss += child_pss;
}
*pss_out = total_pss;
// Close pipes and wait for children to exit
for (int i=0; i<CHILDREN; ++i) {
ASSERT_NOERROR(close(childpipe[i]));
}
for (int i=0; i<CHILDREN; ++i) {
int status;
ASSERT_EQ(childpid[i], waitpid(childpid[i], &status, 0));
ASSERT_TRUE(WIFEXITED(status));
ASSERT_EQ(0, WEXITSTATUS(status));
}
}
TEST(dlext, ns_shared_dlclose) {
std::string path = "libc.so:libc++.so:libdl.so:libm.so";
const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
android_set_application_target_sdk_version(42U); // something > 23
ASSERT_TRUE(android_init_namespaces(path.c_str(), nullptr)) << dlerror();
// preload this library to the default namespace to check if it
// is shared later on.
void* handle_dlopened =
dlopen((lib_path + "/private_namespace_libs/libnstest_dlopened.so").c_str(), RTLD_NOW);
ASSERT_TRUE(handle_dlopened != nullptr) << dlerror();
android_namespace_t* ns_isolated_shared =
android_create_namespace("private_isolated_shared", nullptr,
(lib_path + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED | ANDROID_NAMESPACE_TYPE_SHARED,
nullptr);
ASSERT_TRUE(ns_isolated_shared != nullptr) << dlerror();
// Check if "libnstest_dlopened.so" is loaded (and the same)
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_isolated_shared;
void* handle = android_dlopen_ext("libnstest_dlopened.so", RTLD_NOW | RTLD_NOLOAD, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
ASSERT_TRUE(handle == handle_dlopened);
dlclose(handle);
dlclose(handle_dlopened);
// And now check that the library cannot be found by soname (and is no longer loaded)
handle = android_dlopen_ext("libnstest_dlopened.so", RTLD_NOW | RTLD_NOLOAD, &extinfo);
ASSERT_TRUE(handle == nullptr)
<< "Error: libnstest_dlopened.so is still accessible in shared namespace";
handle = android_dlopen_ext((lib_path + "/private_namespace_libs/libnstest_dlopened.so").c_str(),
RTLD_NOW | RTLD_NOLOAD, &extinfo);
ASSERT_TRUE(handle == nullptr)
<< "Error: libnstest_dlopened.so is still accessible in shared namespace";
handle = dlopen("libnstest_dlopened.so", RTLD_NOW | RTLD_NOLOAD);
ASSERT_TRUE(handle == nullptr)
<< "Error: libnstest_dlopened.so is still accessible in default namespace";
handle = dlopen((lib_path + "/private_namespace_libs/libnstest_dlopened.so").c_str(),
RTLD_NOW | RTLD_NOLOAD);
ASSERT_TRUE(handle == nullptr)
<< "Error: libnstest_dlopened.so is still accessible in default namespace";
// Now lets see if the soinfo area gets reused in the wrong way:
// load a library to default namespace.
const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
ASSERT_TRUE(handle_public != nullptr) << dlerror();
// try to find it in shared namespace
handle = android_dlopen_ext(g_public_lib, RTLD_NOW | RTLD_NOLOAD, &extinfo);
ASSERT_TRUE(handle == nullptr)
<< "Error: " << g_public_lib << " is accessible in shared namespace";
}
TEST(dlext, ns_shared) {
static const char* root_lib = "libnstest_root_not_isolated.so";
static const char* root_lib_isolated = "libnstest_root.so";
std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
ASSERT_TRUE(handle_public != nullptr) << dlerror();
android_set_application_target_sdk_version(42U); // something > 23
ASSERT_TRUE(android_init_namespaces(path.c_str(), nullptr)) << dlerror();
// preload this library to the default namespace to check if it
// is shared later on.
void* handle_dlopened =
dlopen((lib_path + "/private_namespace_libs/libnstest_dlopened.so").c_str(), RTLD_NOW);
ASSERT_TRUE(handle_dlopened != nullptr) << dlerror();
android_namespace_t* ns_not_isolated =
android_create_namespace("private", nullptr,
(lib_path + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_REGULAR, nullptr);
ASSERT_TRUE(ns_not_isolated != nullptr) << dlerror();
android_namespace_t* ns_isolated_shared =
android_create_namespace("private_isolated_shared", nullptr,
(lib_path + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED | ANDROID_NAMESPACE_TYPE_SHARED,
nullptr);
ASSERT_TRUE(ns_isolated_shared != nullptr) << dlerror();
ASSERT_TRUE(dlopen(root_lib, RTLD_NOW) == nullptr);
ASSERT_STREQ("dlopen failed: library \"libnstest_root_not_isolated.so\" not found", dlerror());
std::string lib_private_external_path =
lib_path + "/private_namespace_libs_external/libnstest_private_external.so";
// Load lib_private_external_path to default namespace
// (it should remain invisible for the isolated namespaces after this)
void* handle = dlopen(lib_private_external_path.c_str(), RTLD_NOW);
ASSERT_TRUE(handle != nullptr) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_not_isolated;
void* handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle1 != nullptr) << dlerror();
extinfo.library_namespace = ns_isolated_shared;
void* handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle2 == nullptr);
ASSERT_STREQ("dlopen failed: library \"libnstest_private_external.so\" not found", dlerror());
// Check dlopen by absolute path
handle2 = android_dlopen_ext(lib_private_external_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle2 == nullptr);
ASSERT_EQ("dlopen failed: library \"" + lib_private_external_path + "\" needed"
" or dlopened by \"" + get_executable_name() + "\" is not accessible"
" for the namespace \"private_isolated_shared\"", dlerror());
// load libnstest_root.so to shared namespace in order to check that everything is different
// except shared libnstest_dlopened.so
handle2 = android_dlopen_ext(root_lib_isolated, RTLD_NOW, &extinfo);
typedef const char* (*fn_t)();
fn_t ns_get_local_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_local_string"));
ASSERT_TRUE(ns_get_local_string != nullptr) << dlerror();
fn_t ns_get_local_string_shared = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_local_string"));
ASSERT_TRUE(ns_get_local_string_shared != nullptr) << dlerror();
ASSERT_STREQ("This string is local to root library", ns_get_local_string());
ASSERT_STREQ("This string is local to root library", ns_get_local_string_shared());
ASSERT_TRUE(ns_get_local_string() != ns_get_local_string_shared());
fn_t ns_get_private_extern_string =
reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_private_extern_string"));
ASSERT_TRUE(ns_get_private_extern_string != nullptr) << dlerror();
fn_t ns_get_private_extern_string_shared =
reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_private_extern_string"));
ASSERT_TRUE(ns_get_private_extern_string_shared() != nullptr) << dlerror();
ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string());
ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string_shared());
ASSERT_TRUE(ns_get_private_extern_string() != ns_get_private_extern_string_shared());
fn_t ns_get_public_extern_string =
reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_public_extern_string"));
ASSERT_TRUE(ns_get_public_extern_string != nullptr) << dlerror();
fn_t ns_get_public_extern_string_shared =
reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_public_extern_string"));
ASSERT_TRUE(ns_get_public_extern_string_shared != nullptr) << dlerror();
ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string());
ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string_shared());
ASSERT_TRUE(ns_get_public_extern_string() == ns_get_public_extern_string_shared());
fn_t ns_get_dlopened_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_dlopened_string"));
ASSERT_TRUE(ns_get_dlopened_string != nullptr) << dlerror();
fn_t ns_get_dlopened_string_shared = reinterpret_cast<fn_t>(dlsym(handle2, "ns_get_dlopened_string"));
ASSERT_TRUE(ns_get_dlopened_string_shared != nullptr) << dlerror();
const char** ns_dlopened_string = static_cast<const char**>(dlsym(handle_dlopened, "g_private_dlopened_string"));
ASSERT_TRUE(ns_dlopened_string != nullptr) << dlerror();
ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string());
ASSERT_STREQ("This string is from private namespace (dlopened library)", *ns_dlopened_string);
ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string_shared());
ASSERT_TRUE(ns_get_dlopened_string() != ns_get_dlopened_string_shared());
ASSERT_TRUE(*ns_dlopened_string == ns_get_dlopened_string_shared());
dlclose(handle1);
dlclose(handle2);
}
TEST(dlext, ns_anonymous) {
static const char* root_lib = "libnstest_root.so";
std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;
const std::string lib_path = std::string(getenv("ANDROID_DATA")) + NATIVE_TESTS_PATH;
const std::string lib_public_path = lib_path + "/public_namespace_libs/" + g_public_lib;
void* handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
ASSERT_TRUE(handle_public != nullptr) << dlerror();
ASSERT_TRUE(android_init_namespaces(path.c_str(), (lib_path + "/private_namespace_libs").c_str()))
<< dlerror();
android_namespace_t* ns = android_create_namespace(
"private", nullptr,
(lib_path + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_REGULAR, nullptr);
ASSERT_TRUE(ns != nullptr) << dlerror();
std::string private_library_absolute_path = lib_path + "/private_namespace_libs/" + root_lib;
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns;
// we are going to copy this library to anonymous mmap and call the copy of ns_get_dlopened_string
void* handle = android_dlopen_ext(private_library_absolute_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
uintptr_t ns_get_dlopened_string_addr =
reinterpret_cast<uintptr_t>(dlsym(handle, "ns_get_dlopened_string"));
ASSERT_TRUE(ns_get_dlopened_string_addr != 0) << dlerror();
typedef const char* (*fn_t)();
fn_t ns_get_dlopened_string_private = reinterpret_cast<fn_t>(ns_get_dlopened_string_addr);
std::vector<map_record> maps;
Maps::parse_maps(&maps);
uintptr_t addr_start = 0;
uintptr_t addr_end = 0;
std::vector<map_record> maps_to_copy;
for (const auto& rec : maps) {
if (rec.pathname == private_library_absolute_path) {
if (addr_start == 0) {
addr_start = rec.addr_start;
}
addr_end = rec.addr_end;
maps_to_copy.push_back(rec);
}
}
// some sanity checks..
ASSERT_TRUE(addr_start > 0);
ASSERT_TRUE(addr_end > 0);
ASSERT_EQ(3U, maps_to_copy.size());
ASSERT_TRUE(ns_get_dlopened_string_addr > addr_start);
ASSERT_TRUE(ns_get_dlopened_string_addr < addr_end);
// copy
uintptr_t reserved_addr = reinterpret_cast<uintptr_t>(mmap(nullptr, addr_end - addr_start,
PROT_NONE, MAP_ANON | MAP_PRIVATE,
-1, 0));
ASSERT_TRUE(reinterpret_cast<void*>(reserved_addr) != MAP_FAILED);
for (const auto& rec : maps_to_copy) {
uintptr_t offset = rec.addr_start - addr_start;
size_t size = rec.addr_end - rec.addr_start;
void* addr = reinterpret_cast<void*>(reserved_addr + offset);
void* map = mmap(addr, size, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0);
ASSERT_TRUE(map != MAP_FAILED);
memcpy(map, reinterpret_cast<void*>(rec.addr_start), size);
mprotect(map, size, rec.perms);
}
// call the function copy
uintptr_t ns_get_dlopened_string_offset = ns_get_dlopened_string_addr - addr_start;
fn_t ns_get_dlopened_string_anon = reinterpret_cast<fn_t>(reserved_addr + ns_get_dlopened_string_offset);
ASSERT_STREQ("This string is from private namespace (dlopened library)",
ns_get_dlopened_string_anon());
// They should belong to different namespaces (private and anonymous)
ASSERT_STREQ("This string is from private namespace (dlopened library)",
ns_get_dlopened_string_private());
ASSERT_TRUE(ns_get_dlopened_string_anon() != ns_get_dlopened_string_private());
}