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gerrit.omnirom.org / android_bionic / 8d67ca893c1523eb926b9080dbe4e2ffd2a27ba1 / . / tests / dlext_test.cpp
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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
#include <dlfcn.h>
#include <elf.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <link.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <android/dlext.h>
#include <android-base/file.h>
#include <android-base/strings.h>
#include <android-base/test_utils.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include <sys/wait.h>
#include <meminfo/procmeminfo.h>
#include <procinfo/process_map.h>
#include <ziparchive/zip_archive.h>
#include "bionic/mte.h"
#include "bionic/page.h"
#include "core_shared_libs.h"
#include "dlext_private.h"
#include "dlfcn_symlink_support.h"
#include "gtest_globals.h"
#include "utils.h"
#define ASSERT_DL_NOTNULL(ptr) \
ASSERT_TRUE((ptr) != nullptr) << "dlerror: " << dlerror()
#define ASSERT_DL_ZERO(i) \
ASSERT_EQ(0, i) << "dlerror: " << dlerror()
#define ASSERT_NOERROR(i) \
ASSERT_NE(-1, i) << "errno: " << strerror(errno)
#define ASSERT_SUBSTR(needle, haystack) \
ASSERT_PRED_FORMAT2(::testing::IsSubstring, needle, haystack)
typedef int (*fn)(void);
constexpr const char* kLibName = "libdlext_test.so";
constexpr const char* kLibNameRecursive = "libdlext_test_recursive.so";
constexpr const char* kLibNameNoRelro = "libdlext_test_norelro.so";
constexpr const char* kLibZipSimpleZip = "libdir/libatest_simple_zip.so";
constexpr auto kLibSize = 1024 * 1024; // how much address space to reserve for it
class DlExtTest : public ::testing::Test {
protected:
void SetUp() override {
handle_ = nullptr;
// verify that we don't have the library loaded already
void* h = dlopen(kLibName, RTLD_NOW | RTLD_NOLOAD);
ASSERT_TRUE(h == nullptr);
h = dlopen(kLibNameNoRelro, RTLD_NOW | RTLD_NOLOAD);
ASSERT_TRUE(h == nullptr);
// call dlerror() to swallow the error, and check it was the one we wanted
ASSERT_EQ(std::string("dlopen failed: library \"") + kLibNameNoRelro + "\" wasn't loaded and RTLD_NOLOAD prevented it", dlerror());
}
void TearDown() override {
if (handle_ != nullptr) {
ASSERT_DL_ZERO(dlclose(handle_));
}
}
void* handle_;
const size_t kPageSize = getpagesize();
};
TEST_F(DlExtTest, ExtInfoNull) {
handle_ = android_dlopen_ext(kLibName, 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, ExtInfoNoFlags) {
android_dlextinfo extinfo;
extinfo.flags = 0;
handle_ = android_dlopen_ext(kLibName, 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, ExtInfoUseFd) {
const std::string lib_path = GetTestLibRoot() + "/libdlext_test_fd/libdlext_test_fd.so";
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_F(DlExtTest, ExtInfoUseFdWithOffset) {
const std::string lib_path = GetTestLibRoot() + "/libdlext_test_zip/libdlext_test_zip_zipaligned.zip";
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;
ASSERT_EQ(0, FindEntry(handle, kLibZipSimpleZip, &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);
}
TEST_F(DlExtTest, ExtInfoUseFdWithInvalidOffset) {
const std::string lib_path = GetTestLibRoot() + "/libdlext_test_zip/libdlext_test_zip_zipaligned.zip";
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) + kPageSize;
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 - kPageSize;
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_path + "\" has bad ELF magic: 504b0304", 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_F(DlExtTest, ExtInfoUseOffsetWithoutFd) {
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET;
// This offset will not be used, so it doesn't matter.
extinfo.library_fd_offset = 0;
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(dlext, android_dlopen_ext_force_load_smoke) {
DlfcnSymlink symlink("android_dlopen_ext_force_load_smoke");
const std::string symlink_name = basename(symlink.get_symlink_path().c_str());
// 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(symlink_name.c_str(), RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle2);
ASSERT_TRUE(handle != handle2);
dlclose(handle2);
dlclose(handle);
}
TEST(dlext, android_dlopen_ext_force_load_soname_exception) {
DlfcnSymlink symlink("android_dlopen_ext_force_load_soname_exception");
const std::string symlink_name = basename(symlink.get_symlink_path().c_str());
// Check if soname lookup still returns already loaded library
// when ANDROID_DLEXT_FORCE_LOAD flag is specified.
void* handle = dlopen(symlink_name.c_str(), RTLD_NOW);
ASSERT_DL_NOTNULL(handle);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_FORCE_LOAD;
// Note that 'libdlext_test.so' is dt_soname for the symlink_name
void* handle2 = android_dlopen_ext("libdlext_test.so", RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle2);
ASSERT_TRUE(handle == handle2);
dlclose(handle2);
dlclose(handle);
}
TEST(dlfcn, dlopen_from_nullptr_android_api_level_28) {
// Regression test for http://b/123972211. Testing dlopen(nullptr) when target sdk is P
android_set_application_target_sdk_version(28);
ASSERT_TRUE(dlopen(nullptr, RTLD_NOW) != nullptr);
}
// Test system path translation for backward compatibility. http://b/130219528
TEST(dlfcn, dlopen_system_libicuuc_android_api_level_28) {
android_set_application_target_sdk_version(28);
ASSERT_TRUE(dlopen(PATH_TO_SYSTEM_LIB "libicuuc.so", RTLD_NOW) != nullptr);
ASSERT_TRUE(dlopen(PATH_TO_SYSTEM_LIB "libicui18n.so", RTLD_NOW) != nullptr);
}
TEST(dlfcn, dlopen_system_libicuuc_android_api_level_29) {
android_set_application_target_sdk_version(29);
ASSERT_TRUE(dlopen(PATH_TO_SYSTEM_LIB "libicuuc.so", RTLD_NOW) == nullptr);
ASSERT_TRUE(dlopen(PATH_TO_SYSTEM_LIB "libicui18n.so", RTLD_NOW) == nullptr);
}
TEST(dlfcn, dlopen_system_libicuuc_android_api_level_current) {
ASSERT_TRUE(dlopen(PATH_TO_SYSTEM_LIB "libicuuc.so", RTLD_NOW) == nullptr);
ASSERT_TRUE(dlopen(PATH_TO_SYSTEM_LIB "libicui18n.so", RTLD_NOW) == nullptr);
}
TEST(dlfcn, dlopen_from_zip_absolute_path) {
const std::string lib_zip_path = "/libdlext_test_zip/libdlext_test_zip_zipaligned.zip";
const std::string lib_path = GetTestLibRoot() + lib_zip_path;
void* handle = dlopen((lib_path + "!/libdir/libatest_simple_zip.so").c_str(), RTLD_NOW);
ASSERT_TRUE(handle != nullptr) << dlerror();
uint32_t* taxicab_number = reinterpret_cast<uint32_t*>(dlsym(handle, "dlopen_testlib_taxicab_number"));
ASSERT_DL_NOTNULL(taxicab_number);
EXPECT_EQ(1729U, *taxicab_number);
dlclose(handle);
}
TEST(dlfcn, dlopen_from_zip_with_dt_runpath) {
const std::string lib_zip_path = "/libdlext_test_runpath_zip/libdlext_test_runpath_zip_zipaligned.zip";
const std::string lib_path = GetTestLibRoot() + lib_zip_path;
void* handle = dlopen((lib_path + "!/libdir/libtest_dt_runpath_d_zip.so").c_str(), RTLD_NOW);
ASSERT_TRUE(handle != nullptr) << dlerror();
typedef void *(* dlopen_b_fn)();
dlopen_b_fn fn = (dlopen_b_fn)dlsym(handle, "dlopen_b");
ASSERT_TRUE(fn != nullptr) << dlerror();
void *p = fn();
ASSERT_TRUE(p != nullptr) << dlerror();
dlclose(p);
dlclose(handle);
}
TEST(dlfcn, dlopen_from_zip_ld_library_path) {
const std::string lib_zip_path = "/libdlext_test_zip/libdlext_test_zip_zipaligned.zip";
const std::string lib_path = GetTestLibRoot() + lib_zip_path + "!/libdir";
typedef void (*fn_t)(const char*);
fn_t android_update_LD_LIBRARY_PATH =
reinterpret_cast<fn_t>(dlsym(RTLD_DEFAULT, "android_update_LD_LIBRARY_PATH"));
ASSERT_TRUE(android_update_LD_LIBRARY_PATH != nullptr) << dlerror();
void* handle = dlopen("libdlext_test_zip.so", RTLD_NOW);
ASSERT_TRUE(handle == nullptr);
android_update_LD_LIBRARY_PATH(lib_path.c_str());
handle = dlopen("libdlext_test_zip.so", RTLD_NOW);
ASSERT_TRUE(handle != nullptr) << dlerror();
int (*fn)(void);
fn = reinterpret_cast<int (*)(void)>(dlsym(handle, "getRandomNumber"));
ASSERT_TRUE(fn != nullptr);
EXPECT_EQ(4, fn());
uint32_t* taxicab_number =
reinterpret_cast<uint32_t*>(dlsym(handle, "dlopen_testlib_taxicab_number"));
ASSERT_DL_NOTNULL(taxicab_number);
EXPECT_EQ(1729U, *taxicab_number);
dlclose(handle);
}
TEST_F(DlExtTest, Reserved) {
void* start = mmap(nullptr, kLibSize, 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 = kLibSize;
handle_ = android_dlopen_ext(kLibName, 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) + kLibSize);
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, kPageSize, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_NE(start, new_start) << "dlclose unmapped reserved space";
}
TEST_F(DlExtTest, ReservedTooSmall) {
void* start = mmap(nullptr, kPageSize, 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 = kPageSize;
handle_ = android_dlopen_ext(kLibName, RTLD_NOW, &extinfo);
EXPECT_EQ(nullptr, handle_);
}
TEST_F(DlExtTest, ReservedRecursive) {
void* start = mmap(nullptr, kLibSize, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(start != MAP_FAILED);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS | ANDROID_DLEXT_RESERVED_ADDRESS_RECURSIVE;
extinfo.reserved_addr = start;
extinfo.reserved_size = kLibSize;
handle_ = android_dlopen_ext(kLibNameRecursive, 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) + kLibSize);
EXPECT_EQ(4, f());
f = reinterpret_cast<fn>(dlsym(handle_, "getBiggerRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_GE(reinterpret_cast<void*>(f), start);
EXPECT_LT(reinterpret_cast<void*>(f),
reinterpret_cast<char*>(start) + kLibSize);
EXPECT_EQ(8, f());
uint32_t* taxicab_number = reinterpret_cast<uint32_t*>(dlsym(handle_, "dlopen_testlib_taxicab_number"));
ASSERT_DL_NOTNULL(taxicab_number);
// Untag the pointer so that it can be compared with start, which will be untagged.
void* addr = reinterpret_cast<void*>(untag_address(taxicab_number));
EXPECT_GE(addr, start);
EXPECT_LT(addr, reinterpret_cast<char*>(start) + kLibSize);
EXPECT_EQ(1729U, *taxicab_number);
}
TEST_F(DlExtTest, ReservedRecursiveTooSmall) {
void* start = mmap(nullptr, kPageSize, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(start != MAP_FAILED);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS | ANDROID_DLEXT_RESERVED_ADDRESS_RECURSIVE;
extinfo.reserved_addr = start;
extinfo.reserved_size = kPageSize;
handle_ = android_dlopen_ext(kLibNameRecursive, RTLD_NOW, &extinfo);
EXPECT_EQ(nullptr, handle_);
}
TEST_F(DlExtTest, ReservedHint) {
void* start = mmap(nullptr, kLibSize, 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 = kLibSize;
handle_ = android_dlopen_ext(kLibName, 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) + kLibSize);
EXPECT_EQ(4, f());
}
TEST_F(DlExtTest, ReservedHintTooSmall) {
void* start = mmap(nullptr, kPageSize, 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 = kPageSize;
handle_ = android_dlopen_ext(kLibName, RTLD_NOW, &extinfo);
ASSERT_DL_NOTNULL(handle_);
fn f = reinterpret_cast<fn>(dlsym(handle_, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_TRUE(reinterpret_cast<void*>(f) < start ||
(reinterpret_cast<void*>(f) >= reinterpret_cast<char*>(start) + kPageSize));
EXPECT_EQ(4, f());
}
class DlExtRelroSharingTest : public DlExtTest {
protected:
void SetUp() override {
DlExtTest::SetUp();
void* start = mmap(nullptr, kLibSize, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
ASSERT_TRUE(start != MAP_FAILED);
extinfo_.flags = ANDROID_DLEXT_RESERVED_ADDRESS;
extinfo_.reserved_addr = start;
extinfo_.reserved_size = kLibSize;
extinfo_.relro_fd = -1;
}
void TearDown() override {
DlExtTest::TearDown();
}
void CreateRelroFile(const char* lib, const char* relro_file, bool recursive) {
int relro_fd = open(relro_file, O_RDWR | O_TRUNC | O_CLOEXEC);
ASSERT_NOERROR(relro_fd);
if (recursive) {
extinfo_.flags |= ANDROID_DLEXT_RESERVED_ADDRESS_RECURSIVE;
}
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);
}
fn f = reinterpret_cast<fn>(dlsym(handle, "getRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(4, f());
if (recursive) {
fn f = reinterpret_cast<fn>(dlsym(handle, "getBiggerRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(8, 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);
exit(testing::Test::HasFailure());
}
// 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 | O_CLOEXEC);
ASSERT_NOERROR(relro_fd);
extinfo_.flags |= ANDROID_DLEXT_USE_RELRO;
extinfo_.relro_fd = relro_fd;
}
void TryUsingRelro(const char* lib, bool recursive) {
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());
if (recursive) {
fn f = reinterpret_cast<fn>(dlsym(handle_, "getBiggerRandomNumber"));
ASSERT_DL_NOTNULL(f);
EXPECT_EQ(8, 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);
}
void SpawnChildrenAndMeasurePss(const char* lib, const char* relro_file, bool share_relro,
size_t* pss_out);
std::string FindMappingName(void* ptr);
android_dlextinfo extinfo_;
};
TEST_F(DlExtRelroSharingTest, ChildWritesGoodData) {
TemporaryFile tf; // Use tf to get an unique filename.
ASSERT_NOERROR(close(tf.fd));
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(kLibName, tf.path, false));
ASSERT_NO_FATAL_FAILURE(TryUsingRelro(kLibName, false));
void* relro_data = dlsym(handle_, "lots_of_relro");
ASSERT_DL_NOTNULL(relro_data);
EXPECT_EQ(tf.path, FindMappingName(relro_data));
// Use destructor of tf to close and unlink the file.
tf.fd = extinfo_.relro_fd;
}
TEST_F(DlExtRelroSharingTest, ChildWritesGoodDataRecursive) {
TemporaryFile tf; // Use tf to get an unique filename.
ASSERT_NOERROR(close(tf.fd));
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(kLibNameRecursive, tf.path, true));
ASSERT_NO_FATAL_FAILURE(TryUsingRelro(kLibNameRecursive, true));
void* relro_data = dlsym(handle_, "lots_of_relro");
ASSERT_DL_NOTNULL(relro_data);
EXPECT_EQ(tf.path, FindMappingName(relro_data));
void* recursive_relro_data = dlsym(handle_, "lots_more_relro");
ASSERT_DL_NOTNULL(recursive_relro_data);
EXPECT_EQ(tf.path, FindMappingName(recursive_relro_data));
// Use destructor of tf to close and unlink the file.
tf.fd = extinfo_.relro_fd;
}
TEST_F(DlExtRelroSharingTest, CheckRelroSizes) {
TemporaryFile tf1, tf2;
ASSERT_NOERROR(close(tf1.fd));
ASSERT_NOERROR(close(tf2.fd));
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(kLibNameRecursive, tf1.path, false));
struct stat no_recursive;
ASSERT_NOERROR(fstat(extinfo_.relro_fd, &no_recursive));
tf1.fd = extinfo_.relro_fd;
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(kLibNameRecursive, tf2.path, true));
struct stat with_recursive;
ASSERT_NOERROR(fstat(extinfo_.relro_fd, &with_recursive));
tf2.fd = extinfo_.relro_fd;
// RELRO file should end up bigger when we use the recursive flag, since it
// includes data for more than one library.
ASSERT_GT(with_recursive.st_size, no_recursive.st_size);
}
TEST_F(DlExtRelroSharingTest, ChildWritesNoRelro) {
TemporaryFile tf; // // Use tf to get an unique filename.
ASSERT_NOERROR(close(tf.fd));
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(kLibNameNoRelro, tf.path, false));
ASSERT_NO_FATAL_FAILURE(TryUsingRelro(kLibNameNoRelro, false));
// Use destructor of tf to close and unlink the file.
tf.fd = extinfo_.relro_fd;
}
TEST_F(DlExtRelroSharingTest, RelroFileEmpty) {
ASSERT_NO_FATAL_FAILURE(TryUsingRelro(kLibName, false));
}
TEST_F(DlExtRelroSharingTest, VerifyMemorySaving) {
if (geteuid() != 0) GTEST_SKIP() << "This test must be run as root";
TemporaryFile tf; // Use tf to get an unique filename.
ASSERT_NOERROR(close(tf.fd));
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(kLibName, tf.path, false));
int pipefd[2];
ASSERT_NOERROR(pipe(pipefd));
size_t without_sharing, with_sharing;
ASSERT_NO_FATAL_FAILURE(SpawnChildrenAndMeasurePss(kLibName, tf.path, false, &without_sharing));
ASSERT_NO_FATAL_FAILURE(SpawnChildrenAndMeasurePss(kLibName, tf.path, true, &with_sharing));
ASSERT_LT(with_sharing, without_sharing);
// We expect the sharing to save at least 50% of the library's total PSS.
// In practice it saves 80%+ for this library in the test.
size_t pss_saved = without_sharing - with_sharing;
size_t expected_min_saved = without_sharing / 2;
EXPECT_LT(expected_min_saved, pss_saved);
// Use destructor of tf to close and unlink the file.
tf.fd = extinfo_.relro_fd;
}
void GetPss(bool shared_relro, const char* lib, const char* relro_file, pid_t pid,
size_t* total_pss) {
android::meminfo::ProcMemInfo proc_mem(pid);
const std::vector<android::meminfo::Vma>& maps = proc_mem.MapsWithoutUsageStats();
ASSERT_GT(maps.size(), 0UL);
// Calculate total PSS of the library.
*total_pss = 0;
bool saw_relro_file = false;
for (auto& vma : maps) {
if (android::base::EndsWith(vma.name, lib) || (vma.name == relro_file)) {
if (vma.name == relro_file) {
saw_relro_file = true;
}
android::meminfo::Vma update_vma(vma);
ASSERT_TRUE(proc_mem.FillInVmaStats(update_vma));
*total_pss += update_vma.usage.pss;
}
}
if (shared_relro) ASSERT_TRUE(saw_relro_file);
}
void DlExtRelroSharingTest::SpawnChildrenAndMeasurePss(const char* lib, const char* relro_file,
bool share_relro, size_t* pss_out) {
const int CHILDREN = 20;
// Create children
pid_t child_pids[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
child_pids[i] = child;
childpipe[i] = parent_done_pipe[1];
}
// Sum the PSS of tested library 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(share_relro, lib, relro_file, child_pids[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) {
AssertChildExited(child_pids[i], 0);
}
}
std::string DlExtRelroSharingTest::FindMappingName(void* ptr) {
uint64_t addr = reinterpret_cast<uint64_t>(untag_address(ptr));
std::string found_name = "<not found>";
EXPECT_TRUE(android::procinfo::ReadMapFile("/proc/self/maps",
[&](const android::procinfo::MapInfo& mapinfo) {
if (addr >= mapinfo.start && addr < mapinfo.end) {
found_name = mapinfo.name;
}
}));
return found_name;
}
// Testing namespaces
static const char* g_public_lib = "libnstest_public.so";
// These are libs shared with default namespace
static const std::string g_core_shared_libs = kCoreSharedLibs;
TEST(dlext, ns_smoke) {
static const char* root_lib = "libnstest_root.so";
std::string shared_libs = g_core_shared_libs + ":" + g_public_lib;
ASSERT_FALSE(android_init_anonymous_namespace("", nullptr));
ASSERT_STREQ("android_init_anonymous_namespace failed: error linking namespaces"
" \"(anonymous)\"->\"(default)\": the list of shared libraries is empty.",
dlerror());
const std::string lib_public_path = GetTestLibRoot() + "/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_anonymous_namespace(shared_libs.c_str(), nullptr)) << dlerror();
// Check that libraries added to public namespace are not NODELETE
dlclose(handle_public);
handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW | RTLD_NOLOAD);
ASSERT_TRUE(handle_public == nullptr);
ASSERT_EQ(std::string("dlopen failed: library \"") + lib_public_path +
"\" wasn't loaded and RTLD_NOLOAD prevented it", dlerror());
handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
// create "public namespace", share limited set of public libraries with
android_namespace_t* ns1 =
android_create_namespace("private",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_REGULAR,
nullptr,
nullptr);
ASSERT_TRUE(ns1 != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns1, nullptr, shared_libs.c_str())) << dlerror();
android_namespace_t* ns2 =
android_create_namespace("private_isolated",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(ns2 != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns2, nullptr, shared_libs.c_str())) << 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);
// dlopen for a public library using an absolute path should work
// 1. For isolated namespaces
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
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);
// 1.1 even if it wasn't loaded before
dlclose(handle_public);
handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW | RTLD_NOLOAD);
ASSERT_TRUE(handle_public == nullptr);
ASSERT_EQ(std::string("dlopen failed: library \"") + lib_public_path +
"\" wasn't loaded and RTLD_NOLOAD prevented it", dlerror());
handle = android_dlopen_ext(lib_public_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
ASSERT_TRUE(handle == handle_public);
dlclose(handle);
// 2. And for regular namespaces (make sure it does not load second copy of the library)
extinfo.library_namespace = ns1;
handle = android_dlopen_ext(lib_public_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
ASSERT_TRUE(handle == handle_public);
dlclose(handle);
// 2.1 Unless it was not loaded before - in which case it will load a duplicate.
// TODO(dimitry): This is broken. Maybe we need to deprecate non-isolated namespaces?
dlclose(handle_public);
handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW | RTLD_NOLOAD);
ASSERT_TRUE(handle_public == nullptr);
ASSERT_EQ(std::string("dlopen failed: library \"") + lib_public_path +
"\" wasn't loaded and RTLD_NOLOAD prevented it", dlerror());
handle = android_dlopen_ext(lib_public_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
handle_public = dlopen(lib_public_path.c_str(), RTLD_NOW);
ASSERT_TRUE(handle != handle_public);
dlclose(handle);
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);
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());
// Check that symbols from non-shared libraries a shared library depends on are not visible
// from original namespace.
fn_t ns_get_internal_extern_string =
reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_internal_extern_string"));
ASSERT_TRUE(ns_get_internal_extern_string != nullptr) << dlerror();
ASSERT_TRUE(ns_get_internal_extern_string() == nullptr) <<
"ns_get_internal_extern_string() expected to return null but returns \"" <<
ns_get_internal_extern_string() << "\"";
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);
}
TEST(dlext, dlopen_ext_use_o_tmpfile_fd) {
const std::string lib_path = GetTestLibRoot() + "/libtest_simple.so";
int tmpfd = TEMP_FAILURE_RETRY(
open(GetTestLibRoot().c_str(), O_TMPFILE | O_CLOEXEC | O_RDWR | O_EXCL, 0));
// Ignore kernels without O_TMPFILE flag support
if (tmpfd == -1 && (errno == EISDIR || errno == EINVAL || errno == EOPNOTSUPP)) {
return;
}
ASSERT_TRUE(tmpfd != -1) << strerror(errno);
android_namespace_t* ns =
android_create_namespace("testing-o_tmpfile",
nullptr,
GetTestLibRoot().c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_DL_NOTNULL(ns);
ASSERT_TRUE(android_link_namespaces(ns, nullptr, g_core_shared_libs.c_str())) << dlerror();
std::string content;
ASSERT_TRUE(android::base::ReadFileToString(lib_path, &content)) << strerror(errno);
ASSERT_TRUE(android::base::WriteStringToFd(content, tmpfd)) << strerror(errno);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD | ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_fd = tmpfd;
extinfo.library_namespace = ns;
void* handle = android_dlopen_ext("foobar", 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);
dlclose(handle);
}
TEST(dlext, dlopen_ext_use_memfd) {
const std::string lib_path = GetTestLibRoot() + "/libtest_simple.so";
// create memfd
int memfd = memfd_create("foobar", MFD_CLOEXEC);
if (memfd == -1 && errno == ENOSYS) GTEST_SKIP() << "no memfd_create() in this kernel";
ASSERT_TRUE(memfd != -1) << strerror(errno);
// Check st.f_type is TMPFS_MAGIC for memfd
struct statfs st;
ASSERT_TRUE(TEMP_FAILURE_RETRY(fstatfs(memfd, &st)) == 0) << strerror(errno);
ASSERT_EQ(static_cast<decltype(st.f_type)>(TMPFS_MAGIC), st.f_type);
android_namespace_t* ns =
android_create_namespace("testing-memfd",
nullptr,
GetTestLibRoot().c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_DL_NOTNULL(ns);
ASSERT_TRUE(android_link_namespaces(ns, nullptr, g_core_shared_libs.c_str())) << dlerror();
// read file into memfd backed one.
std::string content;
ASSERT_TRUE(android::base::ReadFileToString(lib_path, &content)) << strerror(errno);
ASSERT_TRUE(android::base::WriteStringToFd(content, memfd)) << strerror(errno);
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_LIBRARY_FD | ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_fd = memfd;
extinfo.library_namespace = ns;
void* handle = android_dlopen_ext("foobar", 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);
dlclose(handle);
}
TEST(dlext, ns_symbol_visibilty_one_namespace) {
static const char* root_lib = "libnstest_root.so";
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
const std::string ns_search_path = GetTestLibRoot() + "/public_namespace_libs:" +
GetTestLibRoot() + "/private_namespace_libs";
android_namespace_t* ns =
android_create_namespace("one",
nullptr,
ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns;
void* handle = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
typedef const char* (*fn_t)();
// Check that relocation worked correctly
fn_t ns_get_internal_extern_string =
reinterpret_cast<fn_t>(dlsym(handle, "ns_get_internal_extern_string"));
ASSERT_TRUE(ns_get_internal_extern_string != nullptr) << dlerror();
ASSERT_STREQ("This string is from a library a shared library depends on", ns_get_internal_extern_string());
fn_t internal_extern_string_fn =
reinterpret_cast<fn_t>(dlsym(handle, "internal_extern_string"));
ASSERT_TRUE(internal_extern_string_fn != nullptr) << dlerror();
ASSERT_STREQ("This string is from a library a shared library depends on", internal_extern_string_fn());
}
TEST(dlext, ns_symbol_visibilty_between_namespaces) {
static const char* root_lib = "libnstest_root.so";
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
const std::string public_ns_search_path = GetTestLibRoot() + "/public_namespace_libs";
const std::string private_ns_search_path = GetTestLibRoot() + "/private_namespace_libs";
android_namespace_t* ns_public =
android_create_namespace("public",
nullptr,
public_ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns_public, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns_private =
android_create_namespace("private",
nullptr,
private_ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns_private, ns_public, g_public_lib)) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_private, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_private;
void* handle = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
typedef const char* (*fn_t)();
// Check that relocation worked correctly
fn_t ns_get_internal_extern_string =
reinterpret_cast<fn_t>(dlsym(handle, "ns_get_internal_extern_string"));
ASSERT_TRUE(ns_get_internal_extern_string != nullptr) << dlerror();
ASSERT_TRUE(ns_get_internal_extern_string() == nullptr) <<
"ns_get_internal_extern_string() expected to return null but returns \"" <<
ns_get_internal_extern_string() << "\"";
fn_t internal_extern_string_fn =
reinterpret_cast<fn_t>(dlsym(handle, "internal_extern_string"));
ASSERT_TRUE(internal_extern_string_fn == nullptr);
ASSERT_STREQ("undefined symbol: internal_extern_string", dlerror());
}
TEST(dlext, ns_unload_between_namespaces) {
static const char* root_lib = "libnstest_root.so";
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
const std::string public_ns_search_path = GetTestLibRoot() + "/public_namespace_libs";
const std::string private_ns_search_path = GetTestLibRoot() + "/private_namespace_libs";
android_namespace_t* ns_public =
android_create_namespace("public",
nullptr,
public_ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns_public, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns_private =
android_create_namespace("private",
nullptr,
private_ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns_private, ns_public, g_public_lib)) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_private, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_private;
void* handle = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
dlclose(handle);
// Check that root_lib was unloaded
handle = android_dlopen_ext(root_lib, RTLD_NOW | RTLD_NOLOAD, &extinfo);
ASSERT_TRUE(handle == nullptr);
ASSERT_EQ(std::string("dlopen failed: library \"") + root_lib +
"\" wasn't loaded and RTLD_NOLOAD prevented it", dlerror());
// Check that shared library was unloaded in public ns
extinfo.library_namespace = ns_public;
handle = android_dlopen_ext(g_public_lib, RTLD_NOW | RTLD_NOLOAD, &extinfo);
ASSERT_TRUE(handle == nullptr);
ASSERT_EQ(std::string("dlopen failed: library \"") + g_public_lib +
"\" wasn't loaded and RTLD_NOLOAD prevented it", dlerror());
}
TEST(dlext, ns_unload_between_namespaces_missing_symbol_direct) {
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
const std::string public_ns_search_path = GetTestLibRoot() + "/public_namespace_libs";
const std::string private_ns_search_path = GetTestLibRoot() + "/private_namespace_libs";
android_namespace_t* ns_public =
android_create_namespace("public",
nullptr,
public_ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns_public, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns_private =
android_create_namespace("private",
nullptr,
private_ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns_private, ns_public, "libtest_missing_symbol.so")) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_private, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_private;
void* handle = android_dlopen_ext((public_ns_search_path + "/libtest_missing_symbol.so").c_str(),
RTLD_NOW,
&extinfo);
ASSERT_TRUE(handle == nullptr);
ASSERT_EQ(std::string("dlopen failed: cannot locate symbol \"dlopen_testlib_missing_symbol\" referenced by \"") +
public_ns_search_path + "/libtest_missing_symbol.so\"...",
dlerror());
}
TEST(dlext, ns_unload_between_namespaces_missing_symbol_indirect) {
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
const std::string public_ns_search_path = GetTestLibRoot() + "/public_namespace_libs";
const std::string private_ns_search_path = GetTestLibRoot() + "/private_namespace_libs";
android_namespace_t* ns_public =
android_create_namespace("public",
nullptr,
public_ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns_public, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns_private =
android_create_namespace("private",
nullptr,
private_ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns_private,
ns_public,
"libnstest_public.so:libtest_missing_symbol_child_public.so")
) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_private, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_private;
void* handle = android_dlopen_ext("libtest_missing_symbol_root.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle == nullptr);
ASSERT_EQ(std::string("dlopen failed: cannot locate symbol \"dlopen_testlib_missing_symbol\" referenced by \"") +
private_ns_search_path + "/libtest_missing_symbol_root.so\"...",
dlerror());
}
TEST(dlext, ns_exempt_list_enabled) {
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
const std::string ns_search_path = GetTestLibRoot() + "/private_namespace_libs";
android_namespace_t* ns =
android_create_namespace("namespace",
nullptr,
ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED | ANDROID_NAMESPACE_TYPE_EXEMPT_LIST_ENABLED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns;
// An app targeting M can open libnativehelper.so because it's on the exempt-list.
android_set_application_target_sdk_version(23);
void* handle = android_dlopen_ext("libnativehelper.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
// Check that loader did not load another copy of libdl.so while loading exempted library.
void* dlsym_ptr = dlsym(handle, "dlsym");
ASSERT_TRUE(dlsym_ptr != nullptr) << dlerror();
ASSERT_EQ(&dlsym, dlsym_ptr);
dlclose(handle);
// An app targeting N no longer has the exempt-list.
android_set_application_target_sdk_version(24);
handle = android_dlopen_ext("libnativehelper.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle == nullptr);
ASSERT_STREQ("dlopen failed: library \"libnativehelper.so\" not found", dlerror());
}
TEST(dlext, ns_exempt_list_disabled_by_default) {
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
const std::string ns_search_path = GetTestLibRoot() + "/private_namespace_libs";
android_namespace_t* ns =
android_create_namespace("namespace",
nullptr,
ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns;
android_set_application_target_sdk_version(23);
void* handle = android_dlopen_ext("libnativehelper.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle == nullptr);
ASSERT_STREQ("dlopen failed: library \"libnativehelper.so\" not found", dlerror());
}
TEST(dlext, ns_cyclic_namespaces) {
// Test that ns1->ns2->ns1 link does not break the loader
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
std::string shared_libs = g_core_shared_libs + ":libthatdoesnotexist.so";
const std::string ns_search_path = GetTestLibRoot() + "/public_namespace_libs";
android_namespace_t* ns1 =
android_create_namespace("ns1",
nullptr,
ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns1, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns2 =
android_create_namespace("ns1",
nullptr,
ns_search_path.c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(android_link_namespaces(ns2, nullptr, g_core_shared_libs.c_str())) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns2, ns1, shared_libs.c_str())) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns1, ns2, shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns1;
void* handle = android_dlopen_ext("libthatdoesnotexist.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle == nullptr);
ASSERT_STREQ("dlopen failed: library \"libthatdoesnotexist.so\" not found", dlerror());
}
TEST(dlext, ns_isolated) {
static const char* root_lib = "libnstest_root_not_isolated.so";
std::string shared_libs = g_core_shared_libs + ":" + g_public_lib;
const std::string lib_public_path = GetTestLibRoot() + "/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_anonymous_namespace(shared_libs.c_str(), nullptr)) << dlerror();
android_namespace_t* ns_not_isolated =
android_create_namespace("private",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_REGULAR,
nullptr,
nullptr);
ASSERT_TRUE(ns_not_isolated != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_not_isolated, nullptr, shared_libs.c_str())) << dlerror();
android_namespace_t* ns_isolated =
android_create_namespace("private_isolated1",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(ns_isolated != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_isolated, nullptr, shared_libs.c_str())) << dlerror();
android_namespace_t* ns_isolated2 =
android_create_namespace("private_isolated2",
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
nullptr,
ANDROID_NAMESPACE_TYPE_ISOLATED,
GetTestLibRoot().c_str(),
nullptr);
ASSERT_TRUE(ns_isolated2 != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_isolated2, nullptr, shared_libs.c_str())) << 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 =
GetTestLibRoot() + "/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;
void* handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle2 == nullptr);
const char* error = dlerror();
ASSERT_MATCH(error,
R"(dlopen failed: library "libnstest_private_external.so" not found: needed by )"
R"(\S+libnstest_root_not_isolated.so in namespace private_isolated1)");
// 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 \"" + android::base::GetExecutablePath() + "\" is not accessible"
" for the namespace \"private_isolated1\"", dlerror());
extinfo.library_namespace = ns_isolated2;
// this should work because isolation_path for private_isolated2 includes GetTestLibRoot()
handle2 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle2 != nullptr) << dlerror();
dlclose(handle2);
// Check dlopen by absolute path
handle2 = android_dlopen_ext(lib_private_external_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle2 != nullptr) << dlerror();
dlclose(handle2);
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();
ASSERT_STREQ("This string is local to root library", ns_get_local_string());
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();
ASSERT_STREQ("This string is from private namespace", ns_get_private_extern_string());
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();
ASSERT_STREQ("This string is from public namespace", ns_get_public_extern_string());
fn_t ns_get_dlopened_string = reinterpret_cast<fn_t>(dlsym(handle1, "ns_get_dlopened_string"));
ASSERT_TRUE(ns_get_dlopened_string != nullptr) << dlerror();
ASSERT_STREQ("This string is from private namespace (dlopened library)", ns_get_dlopened_string());
dlclose(handle1);
}
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 shared_libs = g_core_shared_libs + ":" + g_public_lib;
// create a parent namespace to use instead of the default namespace. This is
// to make this test be independent from the configuration of the default
// namespace.
android_namespace_t* ns_parent =
android_create_namespace("parent",
nullptr,
nullptr,
ANDROID_NAMESPACE_TYPE_REGULAR,
nullptr,
nullptr);
ASSERT_TRUE(ns_parent != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_parent, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_parent;
const std::string lib_public_path = GetTestLibRoot() + "/public_namespace_libs/" + g_public_lib;
void* handle_public = android_dlopen_ext(lib_public_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_public != nullptr) << dlerror();
android_set_application_target_sdk_version(42U); // something > 23
ASSERT_TRUE(android_init_anonymous_namespace(shared_libs.c_str(), nullptr)) << dlerror();
// preload this library to the parent namespace to check if it
// is shared later on.
void* handle_dlopened =
android_dlopen_ext((GetTestLibRoot() + "/private_namespace_libs/libnstest_dlopened.so").c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle_dlopened != nullptr) << dlerror();
// create two child namespaces of 'ns_parent'. One with regular, the other
// with isolated & shared.
android_namespace_t* ns_not_isolated =
android_create_namespace("private",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_REGULAR,
nullptr,
ns_parent);
ASSERT_TRUE(ns_not_isolated != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_not_isolated, ns_parent, g_public_lib)) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_not_isolated, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns_isolated_shared =
android_create_namespace("private_isolated_shared",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED | ANDROID_NAMESPACE_TYPE_SHARED,
nullptr,
ns_parent);
ASSERT_TRUE(ns_isolated_shared != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_isolated_shared, ns_parent, g_public_lib)) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_isolated_shared, nullptr, g_core_shared_libs.c_str())) << dlerror();
ASSERT_TRUE(android_dlopen_ext(root_lib, RTLD_NOW, &extinfo) == nullptr);
ASSERT_STREQ("dlopen failed: library \"libnstest_root_not_isolated.so\" not found", dlerror());
std::string lib_private_external_path =
GetTestLibRoot() + "/private_namespace_libs_external/libnstest_private_external.so";
// Load lib_private_external_path to the parent namespace
// (it should remain invisible for the isolated namespaces after this)
void* handle = android_dlopen_ext(lib_private_external_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
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_MATCH(dlerror(),
R"(dlopen failed: library "libnstest_private_external.so" not found: needed by )"
R"(\S+libnstest_root_not_isolated.so in namespace private_isolated_shared)");
// 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 \"" + android::base::GetExecutablePath() + "\" 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_shared_links_and_paths) {
// Create parent namespace (isolated, not shared)
android_namespace_t* ns_isolated =
android_create_namespace("private_isolated",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
(GetTestLibRoot() + "/public_namespace_libs").c_str(),
nullptr);
ASSERT_TRUE(ns_isolated != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_isolated, nullptr, g_core_shared_libs.c_str())) << dlerror();
// Create shared namespace with ns_isolated parent
android_namespace_t* ns_shared =
android_create_namespace("private_shared",
nullptr,
nullptr,
ANDROID_NAMESPACE_TYPE_SHARED | ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
ns_isolated);
ASSERT_TRUE(ns_shared != nullptr) << dlerror();
// 1. Load a library in ns_shared to check that it has inherited
// search path and the link to the default namespace.
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_shared;
{
void* handle = android_dlopen_ext("libnstest_private.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
const char** ns_private_extern_string = static_cast<const char**>(dlsym(handle, "g_private_extern_string"));
ASSERT_TRUE(ns_private_extern_string != nullptr) << dlerror();
ASSERT_STREQ("This string is from private namespace", *ns_private_extern_string);
dlclose(handle);
}
// 2. Load another test library by absolute path to check that
// it has inherited permitted_when_isolated_path
{
void* handle = android_dlopen_ext(
(GetTestLibRoot() + "/public_namespace_libs/libnstest_public.so").c_str(),
RTLD_NOW,
&extinfo);
ASSERT_TRUE(handle != nullptr) << dlerror();
const char** ns_public_extern_string = static_cast<const char**>(dlsym(handle, "g_public_extern_string"));
ASSERT_TRUE(ns_public_extern_string != nullptr) << dlerror();
ASSERT_STREQ("This string is from public namespace", *ns_public_extern_string);
dlclose(handle);
}
// 3. Check that it is still isolated.
{
void* handle = android_dlopen_ext(
(GetTestLibRoot() + "/libtest_empty.so").c_str(),
RTLD_NOW,
&extinfo);
ASSERT_TRUE(handle == nullptr);
}
}
TEST(dlext, ns_shared_dlclose) {
android_set_application_target_sdk_version(42U); // something > 23
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr)) << dlerror();
// preload this library to the default namespace to check if it
// is shared later on.
void* handle_dlopened =
dlopen((GetTestLibRoot() + "/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,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED | ANDROID_NAMESPACE_TYPE_SHARED,
nullptr,
nullptr);
ASSERT_TRUE(ns_isolated_shared != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_isolated_shared, nullptr, g_core_shared_libs.c_str())) << 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((GetTestLibRoot() + "/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((GetTestLibRoot() + "/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 = GetTestLibRoot() + "/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_isolated_rtld_global) {
static const char* root_lib = "libnstest_root.so";
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
const std::string lib_public_path = GetTestLibRoot() + "/public_namespace_libs";
android_namespace_t* ns1 =
android_create_namespace("isolated1",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
lib_public_path.c_str(),
nullptr);
ASSERT_TRUE(ns1 != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns1, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns2 =
android_create_namespace("isolated2",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
lib_public_path.c_str(),
nullptr);
ASSERT_TRUE(ns2 != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns2, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns1;
void* handle_global = android_dlopen_ext((lib_public_path + "/" + g_public_lib).c_str(),
RTLD_GLOBAL,
&extinfo);
ASSERT_TRUE(handle_global != nullptr) << dlerror();
android_namespace_t* ns1_child =
android_create_namespace("isolated1_child",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
ns1);
ASSERT_TRUE(ns1_child != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns1_child, nullptr, g_core_shared_libs.c_str())) << dlerror();
// Now - only ns1 and ns1 child should be able to dlopen root_lib
// attempt to use ns2 should result in dlerror()
// Check ns1_child first.
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns1_child;
void* handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle1 != nullptr) << dlerror();
// now ns1
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns1;
handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle1 != nullptr) << dlerror();
// and ns2 should fail
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns2;
handle1 = android_dlopen_ext(root_lib, RTLD_NOW, &extinfo);
ASSERT_TRUE(handle1 == nullptr);
ASSERT_MATCH(
dlerror(),
R"(dlopen failed: library "libnstest_public.so" not found: needed by \S+libnstest_root.so)"
R"( in namespace isolated2)");
}
TEST(dlext, ns_inaccessible_error_message) {
// We set up 2 namespaces (a and b) and link a->b with a shared library
// libtestshared.so. Then try to dlopen different library with the same
// name from in namespace a. Note that library should not be accessible
// in either namespace but since it's soname is in the list of shared libs
// the linker will attempt to find it in linked namespace.
//
// Check the error message and make sure it mentions correct namespace name.
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
android_namespace_t* ns_a =
android_create_namespace("ns_a",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(ns_a != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_a, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns_b =
android_create_namespace("ns_b",
nullptr,
GetTestLibRoot().c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(ns_b != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_b, nullptr, g_core_shared_libs.c_str())) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_a, ns_b, "libtestshared.so")) << dlerror();
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_a;
std::string library_path = GetTestLibRoot() + "/inaccessible_libs/libtestshared.so";
void* handle = android_dlopen_ext(library_path.c_str(), RTLD_NOW, &extinfo);
ASSERT_TRUE(handle == nullptr);
std::string expected_dlerror =
android::base::StringPrintf("dlopen failed: library \"%s\" needed or dlopened by \"%s\""
" is not accessible for the namespace \"ns_a\"",
library_path.c_str(),
android::base::GetExecutablePath().c_str());
ASSERT_EQ(expected_dlerror, dlerror());
}
extern "C" bool __loader_android_link_namespaces_all_libs(android_namespace_t* namespace_from,
android_namespace_t* namespace_to);
TEST(dlext, ns_link_namespaces_invalid_arguments) {
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
android_namespace_t* ns =
android_create_namespace("private",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_REGULAR,
nullptr,
nullptr);
ASSERT_TRUE(ns != nullptr) << dlerror();
// Test android_link_namespaces()
ASSERT_FALSE(android_link_namespaces(nullptr, nullptr, "libc.so"));
ASSERT_STREQ("android_link_namespaces failed: error linking namespaces: namespace_from is null.",
dlerror());
ASSERT_FALSE(android_link_namespaces(ns, nullptr, nullptr));
ASSERT_STREQ("android_link_namespaces failed: "
"error linking namespaces \"private\"->\"(default)\": "
"the list of shared libraries is empty.", dlerror());
ASSERT_FALSE(android_link_namespaces(ns, nullptr, ""));
ASSERT_STREQ("android_link_namespaces failed: "
"error linking namespaces \"private\"->\"(default)\": "
"the list of shared libraries is empty.", dlerror());
// Test __loader_android_link_namespaces_all_libs()
ASSERT_FALSE(__loader_android_link_namespaces_all_libs(nullptr, nullptr));
ASSERT_STREQ("android_link_namespaces_all_libs failed: "
"error linking namespaces: namespace_from is null.", dlerror());
ASSERT_FALSE(__loader_android_link_namespaces_all_libs(nullptr, ns));
ASSERT_STREQ("android_link_namespaces_all_libs failed: "
"error linking namespaces: namespace_from is null.", dlerror());
ASSERT_FALSE(__loader_android_link_namespaces_all_libs(ns, nullptr));
ASSERT_STREQ("android_link_namespaces_all_libs failed: "
"error linking namespaces: namespace_to is null.", dlerror());
}
TEST(dlext, ns_allow_all_shared_libs) {
ASSERT_TRUE(android_init_anonymous_namespace(g_core_shared_libs.c_str(), nullptr));
android_namespace_t* ns_a =
android_create_namespace("ns_a",
nullptr,
(GetTestLibRoot() + "/ns_a").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(ns_a != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_a, nullptr, g_core_shared_libs.c_str())) << dlerror();
android_namespace_t* ns_b =
android_create_namespace("ns_b",
nullptr,
(GetTestLibRoot() + "/ns_b").c_str(),
ANDROID_NAMESPACE_TYPE_ISOLATED,
nullptr,
nullptr);
ASSERT_TRUE(ns_b != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_b, nullptr, g_core_shared_libs.c_str())) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns_b, ns_a, "libnstest_ns_a_public1.so")) << dlerror();
ASSERT_TRUE(__loader_android_link_namespaces_all_libs(ns_a, ns_b)) << dlerror();
// Load libs with android_dlopen_ext() from namespace b
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns_b;
void* ns_b_handle1 = android_dlopen_ext("libnstest_ns_a_public1.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(ns_b_handle1 != nullptr) << dlerror();
void* ns_b_handle1_internal =
android_dlopen_ext("libnstest_ns_a_public1_internal.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(ns_b_handle1_internal == nullptr);
void* ns_b_handle2 = android_dlopen_ext("libnstest_ns_b_public2.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(ns_b_handle2 != nullptr) << dlerror();
void* ns_b_handle3 = android_dlopen_ext("libnstest_ns_b_public3.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(ns_b_handle3 != nullptr) << dlerror();
// Load libs with android_dlopen_ext() from namespace a
extinfo.library_namespace = ns_a;
void* ns_a_handle1 = android_dlopen_ext("libnstest_ns_a_public1.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(ns_a_handle1 != nullptr) << dlerror();
void* ns_a_handle1_internal =
android_dlopen_ext("libnstest_ns_a_public1_internal.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(ns_a_handle1_internal != nullptr) << dlerror();
void* ns_a_handle2 = android_dlopen_ext("libnstest_ns_b_public2.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(ns_a_handle2 != nullptr) << dlerror();
void* ns_a_handle3 = android_dlopen_ext("libnstest_ns_b_public3.so", RTLD_NOW, &extinfo);
ASSERT_TRUE(ns_a_handle3 != nullptr) << dlerror();
// Compare the dlopen handle
ASSERT_EQ(ns_b_handle1, ns_a_handle1);
ASSERT_EQ(ns_b_handle2, ns_a_handle2);
ASSERT_EQ(ns_b_handle3, ns_a_handle3);
// Close libs
dlclose(ns_b_handle1);
dlclose(ns_b_handle2);
dlclose(ns_b_handle3);
dlclose(ns_a_handle1);
dlclose(ns_a_handle1_internal);
dlclose(ns_a_handle2);
dlclose(ns_a_handle3);
}
static inline int MapPflagsToProtFlags(uint32_t flags) {
int prot_flags = 0;
if (PF_X & flags) prot_flags |= PROT_EXEC;
if (PF_W & flags) prot_flags |= PROT_WRITE;
if (PF_R & flags) prot_flags |= PROT_READ;
return prot_flags;
}
TEST(dlext, ns_anonymous) {
static const char* root_lib = "libnstest_root.so";
std::string shared_libs = g_core_shared_libs + ":" + g_public_lib;
const std::string lib_public_path = GetTestLibRoot() + "/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_anonymous_namespace(shared_libs.c_str(),
(GetTestLibRoot() + "/private_namespace_libs").c_str())
) << dlerror();
android_namespace_t* ns =
android_create_namespace("private",
nullptr,
(GetTestLibRoot() + "/private_namespace_libs").c_str(),
ANDROID_NAMESPACE_TYPE_REGULAR,
nullptr,
nullptr);
ASSERT_TRUE(ns != nullptr) << dlerror();
ASSERT_TRUE(android_link_namespaces(ns, nullptr, shared_libs.c_str())) << dlerror();
std::string private_library_absolute_path = GetTestLibRoot() + "/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);
Dl_info private_library_info;
ASSERT_NE(dladdr(reinterpret_cast<void*>(ns_get_dlopened_string_addr), &private_library_info), 0)
<< dlerror();
std::vector<map_record> maps_to_copy;
bool has_executable_segment = false;
uintptr_t addr_start = 0;
uintptr_t addr_end = 0;
std::tuple dl_iterate_arg = {&private_library_info, &maps_to_copy, &has_executable_segment,
&addr_start, &addr_end};
ASSERT_EQ(
1, dl_iterate_phdr(
[](dl_phdr_info* info, size_t /*size*/, void* data) -> int {
auto [private_library_info, maps_to_copy, has_executable_segment, addr_start,
addr_end] = *reinterpret_cast<decltype(dl_iterate_arg)*>(data);
if (info->dlpi_addr != reinterpret_cast<ElfW(Addr)>(private_library_info->dli_fbase))
return 0;
for (size_t i = 0; i < info->dlpi_phnum; ++i) {
const ElfW(Phdr)* phdr = info->dlpi_phdr + i;
if (phdr->p_type != PT_LOAD) continue;
*has_executable_segment |= phdr->p_flags & PF_X;
uintptr_t mapping_start = page_start(info->dlpi_addr + phdr->p_vaddr);
uintptr_t mapping_end = page_end(info->dlpi_addr + phdr->p_vaddr + phdr->p_memsz);
if (*addr_start == 0 || mapping_start < *addr_start) *addr_start = mapping_start;
if (*addr_end == 0 || mapping_end > *addr_end) *addr_end = mapping_end;
maps_to_copy->push_back({
.addr_start = mapping_start,
.addr_end = mapping_end,
.perms = MapPflagsToProtFlags(phdr->p_flags),
});
}
return 1;
},
&dl_iterate_arg));
// Some validity checks.
ASSERT_NE(maps_to_copy.size(), 0u);
ASSERT_TRUE(addr_start > 0);
ASSERT_TRUE(addr_end > 0);
ASSERT_TRUE(ns_get_dlopened_string_addr > addr_start);
ASSERT_TRUE(ns_get_dlopened_string_addr < addr_end);
if (!has_executable_segment) {
// For some natively bridged environments this code might be missing
// the executable flag. This is because the guest code is not supposed
// to be executed directly and making it non-executable is more secure.
// In this case we assume the segment with the function is executable.
for (auto& rec : maps_to_copy) {
if (ns_get_dlopened_string_addr >= rec.addr_start &&
ns_get_dlopened_string_addr < rec.addr_end) {
ASSERT_TRUE((rec.perms & PROT_WRITE) == 0);
rec.perms |= PROT_EXEC;
break;
}
}
}
// 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);
struct stat file_stat;
int ret = TEMP_FAILURE_RETRY(stat(private_library_absolute_path.c_str(), &file_stat));
ASSERT_EQ(ret, 0) << "Failed to stat library";
size_t file_size = file_stat.st_size;
{
// Disable MTE while copying the PROT_MTE-protected global variables from
// the existing mappings. We don't really care about turning on PROT_MTE for
// the new copy of the mappings, as this isn't the behaviour under test and
// tags will be ignored. This only applies for MTE-enabled devices.
ScopedDisableMTE disable_mte_for_copying_global_variables;
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);
// Attempting the below memcpy from a portion of the map that is off the end of
// the backing file will cause the kernel to throw a SIGBUS
size_t _size =
::android::procinfo::MappedFileSize(rec.addr_start, rec.addr_end, rec.offset, file_size);
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());
}
TEST(dlext, ns_hidden_child) {
ExecTestHelper eth;
std::string helper = GetTestLibRoot() + "/ns_hidden_child_helper";
std::string app_ns_dir = GetTestLibRoot() + "/ns_hidden_child_app";
eth.SetArgs({ helper.c_str(), app_ns_dir.c_str(), nullptr });
// Add the main libns_hidden_child_*.so libraries to the search path of the default namespace.
std::string env = "LD_LIBRARY_PATH=" + GetTestLibRoot();
eth.SetEnv({ env.c_str(), nullptr });
eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0,
"public_function is non-null\n"
"internal_function is null\n");
}
TEST(dlext, dlopen_handle_value_platform) {
void* handle = dlopen("libtest_dlsym_from_this.so", RTLD_NOW | RTLD_LOCAL);
ASSERT_TRUE((reinterpret_cast<uintptr_t>(handle) & 1) != 0)
<< "dlopen should return odd value for the handle";
dlclose(handle);
}
TEST(dlext, dlopen_handle_value_app_compat) {
android_set_application_target_sdk_version(23);
void* handle = dlopen("libtest_dlsym_from_this.so", RTLD_NOW | RTLD_LOCAL);
ASSERT_TRUE(reinterpret_cast<uintptr_t>(handle) % sizeof(uintptr_t) == 0)
<< "dlopen should return valid pointer";
dlclose(handle);
}