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85 lines
2.3 KiB
85 lines
2.3 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <assert.h>
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#include <stdint.h>
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#include <stdlib.h>
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// This library is built for all targets, including host tests, so __cfi_slowpath may not be
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// present. But it is only used in the bionic loader tests.
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extern "C" __attribute__((weak)) void __cfi_slowpath(uint64_t, void*);
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static size_t g_count;
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static uint64_t g_last_type_id;
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static void* g_last_address;
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static void* g_last_diag;
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extern "C" {
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// Make sure the library crosses at least one kLibraryAlignment(=256KB) boundary.
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char bss[1024 * 1024];
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// Mock a CFI-enabled library without relying on the compiler.
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__attribute__((aligned(4096))) void __cfi_check(uint64_t CallSiteTypeId, void* TargetAddr,
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void* Diag) {
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++g_count;
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g_last_type_id = CallSiteTypeId;
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g_last_address = TargetAddr;
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g_last_diag = Diag;
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}
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size_t get_count() {
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return g_count;
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}
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uint64_t get_last_type_id() {
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return g_last_type_id;
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}
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void* get_last_address() {
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return g_last_address;
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}
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void* get_last_diag() {
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return g_last_diag;
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}
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void* get_global_address() {
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return &g_count;
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}
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}
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// Check that CFI is set up in module constructors and destructors.
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struct A {
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void check_cfi_self() {
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g_last_type_id = 0;
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assert(&__cfi_slowpath);
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// CFI check for an address inside this DSO. This goes to the current module's __cfi_check,
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// which updates g_last_type_id.
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__cfi_slowpath(13, static_cast<void*>(&g_last_type_id));
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assert(g_last_type_id == 13);
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// CFI check for a libc function. This never goes into this module's __cfi_check, and must pass.
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__cfi_slowpath(14, reinterpret_cast<void*>(&exit));
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assert(g_last_type_id == 13);
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}
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A() {
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check_cfi_self();
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}
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~A() {
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check_cfi_self();
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}
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} a;
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