security/sandbox/win/src/eat_resolver.cc@6474c204b198 (annotated)
security/sandbox/win/src/eat_resolver.cc
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Copyright (c) 2006-2010 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #include "sandbox/win/src/eat_resolver.h" |
| michael@0 | 6 | |
| michael@0 | 7 | #include "base/win/pe_image.h" |
| michael@0 | 8 | #include "sandbox/win/src/sandbox_nt_util.h" |
| michael@0 | 9 | |
| michael@0 | 10 | namespace sandbox { |
| michael@0 | 11 | |
| michael@0 | 12 | NTSTATUS EatResolverThunk::Setup(const void* target_module, |
| michael@0 | 13 | const void* interceptor_module, |
| michael@0 | 14 | const char* target_name, |
| michael@0 | 15 | const char* interceptor_name, |
| michael@0 | 16 | const void* interceptor_entry_point, |
| michael@0 | 17 | void* thunk_storage, |
| michael@0 | 18 | size_t storage_bytes, |
| michael@0 | 19 | size_t* storage_used) { |
| michael@0 | 20 | NTSTATUS ret = Init(target_module, interceptor_module, target_name, |
| michael@0 | 21 | interceptor_name, interceptor_entry_point, |
| michael@0 | 22 | thunk_storage, storage_bytes); |
| michael@0 | 23 | if (!NT_SUCCESS(ret)) |
| michael@0 | 24 | return ret; |
| michael@0 | 25 | |
| michael@0 | 26 | if (!eat_entry_) |
| michael@0 | 27 | return STATUS_INVALID_PARAMETER; |
| michael@0 | 28 | |
| michael@0 | 29 | size_t thunk_bytes = GetInternalThunkSize(); |
| michael@0 | 30 | |
| michael@0 | 31 | #if defined(_WIN64) |
| michael@0 | 32 | // We have two thunks, in order: the return path and the forward path. |
| michael@0 | 33 | if (!SetInternalThunk(thunk_storage, storage_bytes, NULL, target_)) |
| michael@0 | 34 | return STATUS_BUFFER_TOO_SMALL; |
| michael@0 | 35 | |
| michael@0 | 36 | storage_bytes -= thunk_bytes; |
| michael@0 | 37 | thunk_storage = reinterpret_cast<char*>(thunk_storage) + thunk_bytes; |
| michael@0 | 38 | #endif |
| michael@0 | 39 | |
| michael@0 | 40 | if (!SetInternalThunk(thunk_storage, storage_bytes, target_, interceptor_)) |
| michael@0 | 41 | return STATUS_BUFFER_TOO_SMALL; |
| michael@0 | 42 | |
| michael@0 | 43 | AutoProtectMemory memory; |
| michael@0 | 44 | ret = memory.ChangeProtection(eat_entry_, sizeof(DWORD), PAGE_READWRITE); |
| michael@0 | 45 | if (!NT_SUCCESS(ret)) |
| michael@0 | 46 | return ret; |
| michael@0 | 47 | |
| michael@0 | 48 | // Perform the patch. |
| michael@0 | 49 | #pragma warning(push) |
| michael@0 | 50 | #pragma warning(disable: 4311) |
| michael@0 | 51 | // These casts generate warnings because they are 32 bit specific. |
| michael@0 | 52 | *eat_entry_ = reinterpret_cast<DWORD>(thunk_storage) - |
| michael@0 | 53 | reinterpret_cast<DWORD>(target_module); |
| michael@0 | 54 | #pragma warning(pop) |
| michael@0 | 55 | |
| michael@0 | 56 | if (NULL != storage_used) |
| michael@0 | 57 | *storage_used = GetThunkSize(); |
| michael@0 | 58 | |
| michael@0 | 59 | return ret; |
| michael@0 | 60 | } |
| michael@0 | 61 | |
| michael@0 | 62 | NTSTATUS EatResolverThunk::ResolveTarget(const void* module, |
| michael@0 | 63 | const char* function_name, |
| michael@0 | 64 | void** address) { |
| michael@0 | 65 | DCHECK_NT(address); |
| michael@0 | 66 | if (!module) |
| michael@0 | 67 | return STATUS_INVALID_PARAMETER; |
| michael@0 | 68 | |
| michael@0 | 69 | base::win::PEImage pe(module); |
| michael@0 | 70 | if (!pe.VerifyMagic()) |
| michael@0 | 71 | return STATUS_INVALID_IMAGE_FORMAT; |
| michael@0 | 72 | |
| michael@0 | 73 | eat_entry_ = pe.GetExportEntry(function_name); |
| michael@0 | 74 | |
| michael@0 | 75 | if (!eat_entry_) |
| michael@0 | 76 | return STATUS_PROCEDURE_NOT_FOUND; |
| michael@0 | 77 | |
| michael@0 | 78 | *address = pe.RVAToAddr(*eat_entry_); |
| michael@0 | 79 | |
| michael@0 | 80 | return STATUS_SUCCESS; |
| michael@0 | 81 | } |
| michael@0 | 82 | |
| michael@0 | 83 | size_t EatResolverThunk::GetThunkSize() const { |
| michael@0 | 84 | #if defined(_WIN64) |
| michael@0 | 85 | return GetInternalThunkSize() * 2; |
| michael@0 | 86 | #else |
| michael@0 | 87 | return GetInternalThunkSize(); |
| michael@0 | 88 | #endif |
| michael@0 | 89 | } |
| michael@0 | 90 | |
| michael@0 | 91 | } // namespace sandbox |
