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// Copyright (c) 2006-2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/win/src/resolver.h"
#include <stddef.h>
// For placement new. This file must not depend on the CRT at runtime, but
// placement operator new is inline.
#include <new>
#include "sandbox/win/src/sandbox_nt_util.h"
namespace {
#if defined(_M_X64)
const USHORT kMovRax = 0xB848;
const USHORT kJmpRax = 0xe0ff;
#pragma pack(push, 1)
struct InternalThunk {
// This struct contains roughly the following code:
// 01 48b8f0debc9a78563412 mov rax,123456789ABCDEF0h
// ff e0 jmp rax
//
// The code modifies rax, but that's fine for x64 ABI.
InternalThunk() {
mov_rax = kMovRax;
jmp_rax = kJmpRax;
interceptor_function = 0;
}
USHORT mov_rax; // = 48 B8
ULONG_PTR interceptor_function;
USHORT jmp_rax; // = ff e0
};
#pragma pack(pop)
#elif defined(_M_ARM64)
const ULONG kLdrX16Pc4 = 0x58000050;
const ULONG kBrX16 = 0xD61F0200;
#pragma pack(push, 4)
struct InternalThunk {
// This struct contains roughly the following code:
// 00 58000050 ldr x16, pc+4
// 04 D61F0200 br x16
// 08 123456789ABCDEF0H
InternalThunk() {
ldr_x16_pc4 = kLdrX16Pc4;
br_x16 = kBrX16;
interceptor_function = 0;
}
ULONG ldr_x16_pc4;
ULONG br_x16;
ULONG_PTR interceptor_function;
};
#pragma pack(pop)
#else
#error "Unsupported Windows 64-bit Arch"
#endif
} // namespace.
namespace sandbox {
size_t ResolverThunk::GetInternalThunkSize() const {
return sizeof(InternalThunk);
}
bool ResolverThunk::SetInternalThunk(void* storage,
size_t storage_bytes,
const void* original_function,
const void* interceptor) {
if (storage_bytes < sizeof(InternalThunk))
return false;
InternalThunk* thunk = new (storage) InternalThunk;
thunk->interceptor_function = reinterpret_cast<ULONG_PTR>(interceptor);
return true;
}
NTSTATUS ResolverThunk::ResolveTarget(const void* module,
const char* function_name,
void** address) {
// We don't support sidestep & co.
return STATUS_NOT_IMPLEMENTED;
}
} // namespace sandbox
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