The Tor Browser: security/sandbox/win/src/service_resolver

security/sandbox/win/src/service_resolver_64.cc@6474c204b198 (annotated)

security/sandbox/win/src/service_resolver_64.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.

 // Copyright (c) 2012 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/service_resolver.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "sandbox/win/src/win_utils.h"
 namespace {
 #pragma pack(push, 1)
 const ULONG kMmovR10EcxMovEax = 0xB8D18B4C;
 const USHORT kSyscall = 0x050F;
 const BYTE kRetNp = 0xC3;
 const ULONG64 kMov1 = 0x54894808244C8948;
 const ULONG64 kMov2 = 0x4C182444894C1024;
 const ULONG kMov3 = 0x20244C89;
 // Service code for 64 bit systems.
 struct ServiceEntry {
   // This struct contains roughly the following code:
   // 00 mov     r10,rcx
   // 03 mov     eax,52h
   // 08 syscall
   // 0a ret
   // 0b xchg    ax,ax
   // 0e xchg    ax,ax
   ULONG mov_r10_rcx_mov_eax;  // = 4C 8B D1 B8
   ULONG service_id;
   USHORT syscall;             // = 0F 05
   BYTE ret;                   // = C3
   BYTE pad;                   // = 66
   USHORT xchg_ax_ax1;         // = 66 90
   USHORT xchg_ax_ax2;         // = 66 90
 };
 // Service code for 64 bit Windows 8.
 struct ServiceEntryW8 {
   // This struct contains the following code:
   // 00 48894c2408      mov     [rsp+8], rcx
   // 05 4889542410      mov     [rsp+10], rdx
   // 0a 4c89442418      mov     [rsp+18], r8
   // 0f 4c894c2420      mov     [rsp+20], r9
   // 14 4c8bd1          mov     r10,rcx
   // 17 b825000000      mov     eax,25h
   // 1c 0f05            syscall
   // 1e c3              ret
   // 1f 90              nop
   ULONG64 mov_1;              // = 48 89 4C 24 08 48 89 54
   ULONG64 mov_2;              // = 24 10 4C 89 44 24 18 4C
   ULONG mov_3;                // = 89 4C 24 20
   ULONG mov_r10_rcx_mov_eax;  // = 4C 8B D1 B8
   ULONG service_id;
   USHORT syscall;             // = 0F 05
   BYTE ret;                   // = C2
   BYTE nop;                   // = 90
 };
 // We don't have an internal thunk for x64.
 struct ServiceFullThunk {
   union {
     ServiceEntry original;
     ServiceEntryW8 original_w8;
   };
 };
 #pragma pack(pop)
 bool IsService(const void* source) {
   const ServiceEntry* service =
       reinterpret_cast<const ServiceEntry*>(source);
   return (kMmovR10EcxMovEax == service->mov_r10_rcx_mov_eax &&
           kSyscall == service->syscall && kRetNp == service->ret);
 }
 };  // namespace
 namespace sandbox {
 NTSTATUS ServiceResolverThunk::Setup(const void* target_module,
                                      const void* interceptor_module,
                                      const char* target_name,
                                      const char* interceptor_name,
                                      const void* interceptor_entry_point,
                                      void* thunk_storage,
                                      size_t storage_bytes,
                                      size_t* storage_used) {
   NTSTATUS ret = Init(target_module, interceptor_module, target_name,
                       interceptor_name, interceptor_entry_point,
                       thunk_storage, storage_bytes);
   if (!NT_SUCCESS(ret))
     return ret;
   size_t thunk_bytes = GetThunkSize();
   scoped_ptr<char[]> thunk_buffer(new char[thunk_bytes]);
   ServiceFullThunk* thunk = reinterpret_cast<ServiceFullThunk*>(
                                 thunk_buffer.get());
   if (!IsFunctionAService(&thunk->original))
     return STATUS_UNSUCCESSFUL;
   ret = PerformPatch(thunk, thunk_storage);
   if (NULL != storage_used)
     *storage_used = thunk_bytes;
   return ret;
 }
 size_t ServiceResolverThunk::GetThunkSize() const {
   return sizeof(ServiceFullThunk);
 }
 bool ServiceResolverThunk::IsFunctionAService(void* local_thunk) const {
   ServiceFullThunk function_code;
   SIZE_T read;
   if (!::ReadProcessMemory(process_, target_, &function_code,
                            sizeof(function_code), &read))
     return false;
   if (sizeof(function_code) != read)
     return false;
   if (!IsService(&function_code)) {
     // See if it's the Win8 signature.
     ServiceEntryW8* w8_service = &function_code.original_w8;
     if (!IsService(&w8_service->mov_r10_rcx_mov_eax) ||
         w8_service->mov_1 != kMov1 || w8_service->mov_1 != kMov1 ||
         w8_service->mov_1 != kMov1) {
       return false;
     }
   }
   // Save the verified code.
   memcpy(local_thunk, &function_code, sizeof(function_code));
   return true;
 }
 NTSTATUS ServiceResolverThunk::PerformPatch(void* local_thunk,
                                             void* remote_thunk) {
   ServiceFullThunk* full_local_thunk = reinterpret_cast<ServiceFullThunk*>(
                                            local_thunk);
   ServiceFullThunk* full_remote_thunk = reinterpret_cast<ServiceFullThunk*>(
                                             remote_thunk);
   // Patch the original code.
   ServiceEntry local_service;
   DCHECK_GE(GetInternalThunkSize(), sizeof(local_service));
   if (!SetInternalThunk(&local_service, sizeof(local_service), NULL,
                         interceptor_))
     return STATUS_UNSUCCESSFUL;
   // Copy the local thunk buffer to the child.
   SIZE_T actual;
   if (!::WriteProcessMemory(process_, remote_thunk, local_thunk,
                             sizeof(ServiceFullThunk), &actual))
     return STATUS_UNSUCCESSFUL;
   if (sizeof(ServiceFullThunk) != actual)
     return STATUS_UNSUCCESSFUL;
   // And now change the function to intercept, on the child.
   if (NULL != ntdll_base_) {
     // Running a unit test.
     if (!::WriteProcessMemory(process_, target_, &local_service,
                               sizeof(local_service), &actual))
       return STATUS_UNSUCCESSFUL;
   } else {
     if (!WriteProtectedChildMemory(process_, target_, &local_service,
                                    sizeof(local_service)))
       return STATUS_UNSUCCESSFUL;
   }
   return STATUS_SUCCESS;
 }
 bool Wow64ResolverThunk::IsFunctionAService(void* local_thunk) const {
   NOTREACHED();
   return false;
 }
 bool Win2kResolverThunk::IsFunctionAService(void* local_thunk) const {
   NOTREACHED();
   return false;
 }
 }  // namespace sandbox

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security/sandbox/win/src/service_resolver_64.cc@6474c204b198 (annotated)

security/sandbox/win/src/service_resolver_64.cc