tequilaOS/platform_bionic
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
platform_bionic/tests/dlext_test.cpp
Kalesh Singh 944164c5e2 RELAND: bionic: loader: Extend LOAD segment VMAs 
When the page_size < p_align of the ELF load segment, the loader
will end up creating extra PROT_NONE gap VMA mappings between the
LOAD segments. This problem is exacerbated by Android's zygote
model, where the number of loaded .so's can lead to ~30MB increase
in vm_area_struct unreclaimable slab memory.

Extend the LOAD segment VMA's to cover the range between the
segment's end and the start of the next segment, being careful
to avoid touching regions of the extended mapping where the offset
would overrun the size of the file. This avoids the loader
creating an additional gap VMA for each LOAD segment.

Consider a system with 4KB page size and the ELF files with 64K
alignment. e.g:

$ readelf -Wl /system/lib64/bootstrap/libc.so | grep 'Type\|LOAD'

Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
LOAD           0x000000 0x0000000000000000 0x0000000000000000 0x0441a8 0x0441a8 R   0x10000
LOAD           0x0441b0 0x00000000000541b0 0x00000000000541b0 0x091860 0x091860 R E 0x10000
LOAD           0x0d5a10 0x00000000000f5a10 0x00000000000f5a10 0x003d40 0x003d40 RW  0x10000
LOAD           0x0d9760 0x0000000000109760 0x0000000000109760 0x0005c0 0x459844 RW  0x10000

Before this patch:

$ cat /proc/1/maps | grep -A1 libc.so

7fa1d4a90000-7fa1d4ad5000 r--p 00000000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7fa1d4ad5000-7fa1d4ae4000 ---p 00000000 00:00 0
7fa1d4ae4000-7fa1d4b76000 r-xp 00044000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7fa1d4b76000-7fa1d4b85000 ---p 00000000 00:00 0
7fa1d4b85000-7fa1d4b8a000 r--p 000d5000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7fa1d4b8a000-7fa1d4b99000 ---p 00000000 00:00 0
7fa1d4b99000-7fa1d4b9a000 rw-p 000d9000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7fa1d4b9a000-7fa1d4feb000 rw-p 00000000 00:00 0                          [anon:.bss]

3 additional PROT_NONE (---p) VMAs for gap mappings.

After this patch:

$ cat /proc/1/maps | grep -A1 libc.so

7f468f069000-7f468f0bd000 r--p 00000000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7f468f0bd000-7f468f15e000 r-xp 00044000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7f468f15e000-7f468f163000 r--p 000d5000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7f468f163000-7f468f172000 rw-p 000da000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7f468f172000-7f468f173000 rw-p 000d9000 fe:09 20635520                   /system/lib64/bootstrap/libc.so
7f468f173000-7f468f5c4000 rw-p 00000000 00:00 0                          [anon:.bss]

No additional gap VMAs. However notice there is an extra RW VMA at
offset 0x000da000. This is caused by the RO protection of the
GNU_RELRO segment, which causes the extended RW VMA to split.
The GNU_RELRO protection extension is handled in the subsequent
patch in this series.

Bug: 316403210
Bug: 300367402
Bug: 307803052
Bug: 312550202
Test: atest -c linker-unit-tests
Test: atest -c bionic-unit-tests
Change-Id: I7150ed22af0723cc0b2d326c046e4e4a8b56ad09
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
2024-02-27 06:13:11 +00:00

2113 lines
86 KiB
C++
Raw Blame History

/*
* 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 <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 "core_shared_libs.h"
#include "gtest_globals.h"
#include "utils.h"
#include "dlext_private.h"
#include "dlfcn_symlink_support.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);
}
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);
std::vector<map_record> maps;
Maps::parse_maps(&maps);
uintptr_t addr_start = 0;
uintptr_t addr_end = 0;
bool has_executable_segment = false;
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;
has_executable_segment = has_executable_segment || (rec.perms & PROT_EXEC) != 0;
maps_to_copy.push_back(rec);
}
}
// Some validity checks.
ASSERT_TRUE(addr_start > 0);
ASSERT_TRUE(addr_end > 0);
ASSERT_TRUE(maps_to_copy.size() > 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;
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";
chmod(helper.c_str(), 0755); // TODO: "x" lost in CTS, b/34945607
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);
}
Reference in a new issue View git blame Copy permalink