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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "base/debug/invalid_access_win.h"
#include <windows.h>
#include <intrin.h>
#include <stdlib.h>
#include "base/check.h"
#include "base/notreached.h"
#include "build/build_config.h"
namespace base {
namespace debug {
namespace win {
namespace {
#if defined(ARCH_CPU_X86_FAMILY)
// On x86/x64 systems, nop instructions are generally 1 byte.
static constexpr int kNopInstructionSize = 1;
#elif defined(ARCH_CPU_ARM64)
// On Arm systems, all instructions are 4 bytes, fixed size.
static constexpr int kNopInstructionSize = 4;
#else
#error "Unsupported architecture"
#endif
// Function that can be jumped midway into safely.
__attribute__((naked)) int nop_sled() {
asm("nop\n"
"nop\n"
"ret\n");
}
using FuncType = decltype(&nop_sled);
void IndirectCall(FuncType* func) {
// This code always generates CFG guards.
(*func)();
}
} // namespace
void TerminateWithHeapCorruption() {
__try {
HANDLE heap = ::HeapCreate(0, 0, 0);
CHECK(heap);
CHECK(HeapSetInformation(heap, HeapEnableTerminationOnCorruption, nullptr,
0));
void* addr = ::HeapAlloc(heap, 0, 0x1000);
CHECK(addr);
// Corrupt heap header.
char* addr_mutable = reinterpret_cast<char*>(addr);
memset(addr_mutable - sizeof(addr), 0xCC, sizeof(addr));
HeapFree(heap, 0, addr);
HeapDestroy(heap);
} __except (EXCEPTION_EXECUTE_HANDLER) {
// Heap corruption exception should never be caught.
NOTREACHED();
}
// Should never reach here.
abort();
}
void TerminateWithControlFlowViolation() {
// Call into the middle of the NOP sled.
FuncType func = reinterpret_cast<FuncType>(
(reinterpret_cast<uintptr_t>(nop_sled)) + kNopInstructionSize);
__try {
// Generates a STATUS_STACK_BUFFER_OVERRUN exception if CFG triggers.
IndirectCall(&func);
} __except (EXCEPTION_EXECUTE_HANDLER) {
// CFG fast fail should never be caught.
NOTREACHED();
}
// Should only reach here if CFG is disabled.
abort();
}
} // namespace win
} // namespace debug
} // namespace base
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