| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <dlfcn.h> |
| #include <gtest/gtest.h> |
| |
| #include <thread> |
| |
| #include "gtest_globals.h" |
| #include "utils.h" |
| |
| // Access libtest_elftls_shared_var.so's TLS variable using an IE access. |
| __attribute__((tls_model("initial-exec"))) extern "C" __thread int elftls_shared_var; |
| |
| TEST(elftls_dl, dlopen_shared_var_ie) { |
| // libtest_elftls_shared_var_ie.so can be dlopen'ed, even though it contains a |
| // TLS IE access, because its IE access references a TLS variable from |
| // libtest_elftls_shared_var.so, which is DT_NEEDED by the executable. This |
| // pattern appears in sanitizers, which use TLS IE instrumentation in shared |
| // objects to access special variables exported from the executable or from a |
| // preloaded solib. |
| void* lib = dlopen("libtest_elftls_shared_var_ie.so", RTLD_LOCAL | RTLD_NOW); |
| ASSERT_NE(nullptr, lib); |
| |
| auto bump_shared_var = reinterpret_cast<int(*)()>(dlsym(lib, "bump_shared_var")); |
| ASSERT_NE(nullptr, bump_shared_var); |
| |
| ASSERT_EQ(21, ++elftls_shared_var); |
| ASSERT_EQ(22, bump_shared_var()); |
| |
| std::thread([bump_shared_var] { |
| ASSERT_EQ(21, ++elftls_shared_var); |
| ASSERT_EQ(22, bump_shared_var()); |
| }).join(); |
| } |
| |
| TEST(elftls_dl, dlopen_ie_error) { |
| std::string helper = GetTestlibRoot() + |
| "/elftls_dlopen_ie_error_helper/elftls_dlopen_ie_error_helper"; |
| std::string src_path = GetTestlibRoot() + "/libtest_elftls_shared_var_ie.so"; |
| std::string dst_path = GetTestlibRoot() + "/libtest_elftls_shared_var.so"; |
| #if defined(__BIONIC__) |
| std::string error = |
| "dlerror: dlopen failed: TLS symbol \"elftls_shared_var\" in dlopened \"" + dst_path + "\" " + |
| "referenced from \"" + src_path + "\" using IE access model\n"; |
| #else |
| // glibc will reserve some surplus static TLS memory, allowing this test to pass. |
| std::string error = "success\n"; |
| #endif |
| |
| chmod(helper.c_str(), 0755); // TODO: "x" lost in CTS, b/34945607 |
| ExecTestHelper eth; |
| eth.SetArgs({ helper.c_str(), nullptr }); |
| eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0, error.c_str()); |
| } |