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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 <sys/stat.h>
#include <vector>
#include "BionicDeathTest.h"
#include "gtest_globals.h"
#include "utils.h"
#if defined(__BIONIC__)
#include "private/CFIShadow.h"
#endif
// Private libdl interface.
extern "C" {
void __cfi_slowpath(uint64_t CallSiteTypeId, void* Ptr);
void __cfi_slowpath_diag(uint64_t CallSiteTypeId, void* Ptr, void* DiagData);
size_t __cfi_shadow_size();
}
static void f() {}
static void test_cfi_slowpath_with_alloc() {
std::vector<void*> allocs;
for (size_t i = 0; i < 1000; i++) {
allocs.push_back(malloc(4096));
__cfi_slowpath(46, allocs.back());
}
}
TEST(cfi_test, basic) {
#if defined(__BIONIC__)
void* handle;
handle = dlopen("libcfi-test.so", RTLD_NOW | RTLD_LOCAL);
ASSERT_TRUE(handle != nullptr) << dlerror();
EXPECT_NE(0U, __cfi_shadow_size());
#define SYM(type, name) auto name = reinterpret_cast<type>(dlsym(handle, #name))
SYM(size_t (*)(), 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);
SYM(char*, bss);
#undef SYM
size_t 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 heap address.
// It's possible that this allocation could wind up in the same CFI granule as
// an unchecked library, which means the below might not crash. To force a
// crash keep allocating up to a max until there is a crash.
EXPECT_DEATH(test_cfi_slowpath_with_alloc(), "");
// Check all the addresses.
const size_t bss_size = 1024 * 1024;
static_assert(bss_size >= kLibraryAlignment * 2, "test range not big enough");
for (size_t i = 0; i < bss_size; ++i) {
__cfi_slowpath(47, bss + i);
EXPECT_EQ(++c, get_count());
}
// 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)), "");
#endif
}
TEST(cfi_test, invalid) {
#if defined(__BIONIC__)
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();
#endif
}
// cfi_test_helper exports __cfi_check, which triggers CFI initialization at startup.
TEST(cfi_test, early_init) {
#if defined(__BIONIC__)
std::string helper = GetTestlibRoot() + "/cfi_test_helper/cfi_test_helper";
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, 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 = GetTestlibRoot() + "/cfi_test_helper2/cfi_test_helper2";
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, nullptr);
#endif
}
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