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

security/sandbox/win/src/sandbox_nt_util.h@b8a032363ba2 (annotated)

security/sandbox/win/src/sandbox_nt_util.h

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 // Copyright (c) 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.
 #ifndef SANDBOX_SRC_SANDBOX_NT_UTIL_H_
 #define SANDBOX_SRC_SANDBOX_NT_UTIL_H_
 #include <intrin.h>
 #include "base/basictypes.h"
 #include "sandbox/win/src/nt_internals.h"
 #include "sandbox/win/src/sandbox_nt_types.h"
 // Placement new and delete to be used from ntdll interception code.
 void* __cdecl operator new(size_t size, sandbox::AllocationType type,
                            void* near_to = NULL);
 void __cdecl operator delete(void* memory, sandbox::AllocationType type);
 // Add operator delete that matches the placement form of the operator new
 // above. This is required by compiler to generate code to call operator delete
 // in case the object's constructor throws an exception.
 // See http://msdn.microsoft.com/en-us/library/cxdxz3x6.aspx
 void __cdecl operator delete(void* memory, sandbox::AllocationType type,
                              void* near_to);
 // Regular placement new and delete
 void* __cdecl operator new(size_t size, void* buffer,
                            sandbox::AllocationType type);
 void __cdecl operator delete(void* memory, void* buffer,
                              sandbox::AllocationType type);
 // DCHECK_NT is defined to be pretty much an assert at this time because we
 // don't have logging from the ntdll layer on the child.
 //
 // VERIFY_NT and VERIFY_SUCCESS_NT are the standard asserts on debug, but
 // execute the actual argument on release builds. VERIFY_NT expects an action
 // returning a bool, while VERIFY_SUCCESS_NT expects an action returning
 // NTSTATUS.
 #ifndef NDEBUG
 #define DCHECK_NT(condition) { (condition) ? (void)0 : __debugbreak(); }
 #define VERIFY(action) DCHECK_NT(action)
 #define VERIFY_SUCCESS(action) DCHECK_NT(NT_SUCCESS(action))
 #else
 #define DCHECK_NT(condition)
 #define VERIFY(action) (action)
 #define VERIFY_SUCCESS(action) (action)
 #endif
 #define NOTREACHED_NT() DCHECK_NT(false)
 namespace sandbox {
 #if defined(_M_X64)
 #pragma intrinsic(_InterlockedCompareExchange)
 #pragma intrinsic(_InterlockedCompareExchangePointer)
 #elif defined(_M_IX86)
 extern "C" long _InterlockedCompareExchange(long volatile* destination,
                                             long exchange, long comperand);
 #pragma intrinsic(_InterlockedCompareExchange)
 // We want to make sure that we use an intrinsic version of the function, not
 // the one provided by kernel32.
 __forceinline void* _InterlockedCompareExchangePointer(
     void* volatile* destination, void* exchange, void* comperand) {
   size_t ret = _InterlockedCompareExchange(
       reinterpret_cast<long volatile*>(destination),
       static_cast<long>(reinterpret_cast<size_t>(exchange)),
       static_cast<long>(reinterpret_cast<size_t>(comperand)));
   return reinterpret_cast<void*>(static_cast<size_t>(ret));
 }
 #else
 #error Architecture not supported.
 #endif
 // Returns a pointer to the IPC shared memory.
 void* GetGlobalIPCMemory();
 // Returns a pointer to the Policy shared memory.
 void* GetGlobalPolicyMemory();
 enum RequiredAccess {
   READ,
   WRITE
 };
 // Performs basic user mode buffer validation. In any case, buffers access must
 // be protected by SEH. intent specifies if the buffer should be tested for read
 // or write.
 // Note that write intent implies destruction of the buffer content (we actually
 // write)
 bool ValidParameter(void* buffer, size_t size, RequiredAccess intent);
 // Copies data from a user buffer to our buffer. Returns the operation status.
 NTSTATUS CopyData(void* destination, const void* source, size_t bytes);
 // Copies the name from an object attributes.
 NTSTATUS AllocAndCopyName(const OBJECT_ATTRIBUTES* in_object,
                           wchar_t** out_name, uint32* attributes, HANDLE* root);
 // Initializes our ntdll level heap
 bool InitHeap();
 // Returns true if the provided handle refers to the current process.
 bool IsSameProcess(HANDLE process);
 enum MappedModuleFlags {
   MODULE_IS_PE_IMAGE     = 1,   // Module is an executable.
   MODULE_HAS_ENTRY_POINT = 2,   // Execution entry point found.
   MODULE_HAS_CODE =        4    // Non zero size of executable sections.
 };
 // Returns the name and characteristics for a given PE module. The return
 // value is the name as defined by the export table and the flags is any
 // combination of the MappedModuleFlags enumeration.
 //
 // The returned buffer must be freed with a placement delete from the ntdll
 // level allocator:
 //
 // UNICODE_STRING* name = GetPEImageInfoFromModule(HMODULE module, &flags);
 // if (!name) {
 //   // probably not a valid dll
 //   return;
 // }
 // InsertYourLogicHere(name);
 // operator delete(name, NT_ALLOC);
 UNICODE_STRING* GetImageInfoFromModule(HMODULE module, uint32* flags);
 // Returns the full path and filename for a given dll.
 // May return NULL if the provided address is not backed by a named section, or
 // if the current OS version doesn't support the call. The returned buffer must
 // be freed with a placement delete (see GetImageNameFromModule example).
 UNICODE_STRING* GetBackingFilePath(PVOID address);
 // Returns the last component of a path that contains the module name.
 // It will return NULL if the path ends with the path separator. The returned
 // buffer must be freed with a placement delete (see GetImageNameFromModule
 // example).
 UNICODE_STRING* ExtractModuleName(const UNICODE_STRING* module_path);
 // Returns true if the parameters correspond to a dll mapped as code.
 bool IsValidImageSection(HANDLE section, PVOID *base, PLARGE_INTEGER offset,
                          PSIZE_T view_size);
 // Converts an ansi string to an UNICODE_STRING.
 UNICODE_STRING* AnsiToUnicode(const char* string);
 // Provides a simple way to temporarily change the protection of a memory page.
 class AutoProtectMemory {
  public:
   AutoProtectMemory()
       : changed_(false), address_(NULL), bytes_(0), old_protect_(0) {}
   ~AutoProtectMemory() {
     RevertProtection();
   }
   // Sets the desired protection of a given memory range.
   NTSTATUS ChangeProtection(void* address, size_t bytes, ULONG protect);
   // Restores the original page protection.
   NTSTATUS RevertProtection();
  private:
   bool changed_;
   void* address_;
   size_t bytes_;
   ULONG old_protect_;
   DISALLOW_COPY_AND_ASSIGN(AutoProtectMemory);
 };
 // Returns true if the file_rename_information structure is supported by our
 // rename handler.
 bool IsSupportedRenameCall(FILE_RENAME_INFORMATION* file_info, DWORD length,
                            uint32 file_info_class);
 }  // namespace sandbox
 #endif  // SANDBOX_SRC_SANDBOX_NT_UTIL_H__

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security/sandbox/win/src/sandbox_nt_util.h@b8a032363ba2 (annotated)

security/sandbox/win/src/sandbox_nt_util.h