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/*
* Copyright (C) 2017 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 <dlfcn.h>
#include <gtest/gtest.h>
#include "BionicDeathTest.h"
#include "gtest_globals.h"
#include "utils.h"
// Private libdl interface.
extern "C" {
void __cfi_slowpath(uint64_t CallSiteTypeId, void* Ptr);
void __cfi_slowpath_diag(uint64_t CallSiteTypeId, void* Ptr, void* DiagData);
}
static void f() {}
TEST(cfi_test, basic) {
void* handle;
handle = dlopen("libcfi-test.so", RTLD_NOW | RTLD_LOCAL);
ASSERT_TRUE(handle != nullptr) << dlerror();
#define SYM(type, name) auto name = reinterpret_cast<type>(dlsym(handle, #name))
SYM(int (*)(), get_count);
SYM(uint64_t(*)(), get_last_type_id);
SYM(void* (*)(), get_last_address);
SYM(void* (*)(), get_last_diag);
SYM(void* (*)(), get_global_address);
SYM(void (*)(uint64_t, void*, void*), __cfi_check);
#undef SYM
int c = get_count();
// CFI check for code inside the DSO. Can't use just any function address - this is only
// guaranteed to work for code addresses above __cfi_check.
void* code_ptr = reinterpret_cast<char*>(__cfi_check) + 1234;
void* diag_ptr = reinterpret_cast<void*>(5678);
__cfi_slowpath_diag(42, code_ptr, diag_ptr);
EXPECT_EQ(42U, get_last_type_id());
EXPECT_EQ(code_ptr, get_last_address());
EXPECT_EQ(diag_ptr, get_last_diag());
EXPECT_EQ(++c, get_count());
// __cfi_slowpath passes nullptr for the Diag argument.
__cfi_slowpath(42, code_ptr);
EXPECT_EQ(42U, get_last_type_id());
EXPECT_EQ(code_ptr, get_last_address());
EXPECT_EQ(nullptr, get_last_diag());
EXPECT_EQ(++c, get_count());
// CFI check for a data address inside the DSO.
__cfi_slowpath(43, get_global_address());
EXPECT_EQ(43U, get_last_type_id());
EXPECT_EQ(get_global_address(), get_last_address());
EXPECT_EQ(++c, get_count());
// CFI check for a function inside _this_ DSO. It either goes to this DSO's __cfi_check,
// or (if missing) is simply ignored. Any way, it does not affect the test lib's counters.
__cfi_slowpath(44, reinterpret_cast<void*>(&f));
EXPECT_EQ(43U, get_last_type_id());
EXPECT_EQ(get_global_address(), get_last_address());
EXPECT_EQ(c, get_count());
// CFI check for a stack address. This is always invalid and gets the process killed.
EXPECT_DEATH(__cfi_slowpath(45, reinterpret_cast<void*>(&c)), "");
// CFI check for a heap address. This is always invalid and gets the process killed.
void* p = malloc(4096);
EXPECT_DEATH(__cfi_slowpath(46, p), "");
free(p);
// Load the same library again.
void* handle2 = dlopen("libcfi-test.so", RTLD_NOW | RTLD_LOCAL);
ASSERT_TRUE(handle2 != nullptr) << dlerror();
EXPECT_EQ(handle2, handle);
// Check that it is still there.
__cfi_slowpath(43, get_global_address());
EXPECT_EQ(43U, get_last_type_id());
EXPECT_EQ(get_global_address(), get_last_address());
EXPECT_EQ(++c, get_count());
dlclose(handle);
dlclose(handle2);
// CFI check for a function inside the unloaded DSO. This is always invalid and gets the process
// killed.
EXPECT_DEATH(__cfi_slowpath(45, reinterpret_cast<void*>(code_ptr)), "");
}
TEST(cfi_test, invalid) {
void* handle;
handle = dlopen("libcfi-test-bad.so", RTLD_NOW | RTLD_LOCAL);
ASSERT_FALSE(handle != nullptr) << dlerror();
handle = dlopen("libcfi-test-bad.so", RTLD_NOW | RTLD_LOCAL);
ASSERT_FALSE(handle != nullptr) << dlerror();
}
// cfi_test_helper exports __cfi_check, which triggers CFI initialization at startup.
TEST(cfi_test, early_init) {
#if defined(__BIONIC__)
std::string helper = get_testlib_root() + "/cfi_test_helper/cfi_test_helper";
ExecTestHelper eth;
eth.SetArgs({ helper.c_str(), nullptr });
eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0, nullptr);
#endif
}
// cfi_test_helper2 depends on a library that exports __cfi_check, which triggers CFI initialization
// at startup.
TEST(cfi_test, early_init2) {
#if defined(__BIONIC__)
std::string helper = get_testlib_root() + "/cfi_test_helper2/cfi_test_helper2";
ExecTestHelper eth;
eth.SetArgs({ helper.c_str(), nullptr });
eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0, nullptr);
#endif
}
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