ntoskrnl/mm/virtual.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * PROJECT:     ReactOS kernel
  22  * FILE:        ntoskrnl/mm/virtual.c
  23  * PURPOSE:     Implementing operations on virtual memory.
  24  * PROGRAMMER:  David Welch
  25  */
  26
  27 /* INCLUDE *****************************************************************/
  28
  29 #include <ddk/ntddk.h>
  30 #include <internal/mm.h>
  31 #include <internal/ob.h>
  32 #include <internal/io.h>
  33 #include <internal/ps.h>
  34 #include <internal/pool.h>
  35 #include <internal/safe.h>
  36
  37 #define NDEBUG
  38 #include <internal/debug.h>
  39
  40 /* FUNCTIONS *****************************************************************/
  41
  42 NTSTATUS STDCALL
  43 NtFlushVirtualMemory(IN HANDLE  ProcessHandle,
  44                      IN PVOID   BaseAddress,
  45                      IN ULONG   NumberOfBytesToFlush,
  46                      OUT PULONG NumberOfBytesFlushed OPTIONAL)
  47 /*
  48  * FUNCTION: Flushes virtual memory to file
  49  * ARGUMENTS:
  50  *        ProcessHandle = Points to the process that allocated the virtual
  51  *                        memory
  52  *        BaseAddress = Points to the memory address
  53  *        NumberOfBytesToFlush = Limits the range to flush,
  54  *        NumberOfBytesFlushed = Actual number of bytes flushed
  55  * RETURNS: Status
  56  */
  57 {
  58   UNIMPLEMENTED;
  59 }
  60
  61 NTSTATUS STDCALL
  62 NtLockVirtualMemory(HANDLE      ProcessHandle,
  63                     PVOID       BaseAddress,
  64                     ULONG       NumberOfBytesToLock,
  65                     PULONG      NumberOfBytesLocked)
  66 {
  67   UNIMPLEMENTED;
  68 }
  69
  70 NTSTATUS STDCALL
  71 NtQueryVirtualMemory (IN HANDLE ProcessHandle,
  72                       IN PVOID Address,
  73                       IN CINT VirtualMemoryInformationClass,
  74                       OUT PVOID VirtualMemoryInformation,
  75                       IN ULONG Length,
  76                       OUT PULONG UnsafeResultLength)
  77 {
  78    NTSTATUS Status;
  79    PEPROCESS Process;
  80    MEMORY_AREA* MemoryArea;
  81    ULONG ResultLength = 0;
  82    PMADDRESS_SPACE AddressSpace;
  83
  84    DPRINT("NtQueryVirtualMemory(ProcessHandle %x, Address %x, "
  85           "VirtualMemoryInformationClass %d, VirtualMemoryInformation %x, "
  86           "Length %lu ResultLength %x)\n",ProcessHandle,Address,
  87           VirtualMemoryInformationClass,VirtualMemoryInformation,
  88           Length,ResultLength);
  89
  90    Status = ObReferenceObjectByHandle(ProcessHandle,
  91                                       PROCESS_QUERY_INFORMATION,
  92                                       NULL,
  93                                       UserMode,
  94                                       (PVOID*)(&Process),
  95                                       NULL);
  96
  97    if (!NT_SUCCESS(Status))
  98      {
  99        DPRINT("NtQueryVirtualMemory() = %x\n",Status);
 100        return(Status);
 101      }
 102
 103    AddressSpace = &Process->AddressSpace;
 104    MmLockAddressSpace(AddressSpace);
 105    MemoryArea = MmOpenMemoryAreaByAddress(AddressSpace,
 106                                           Address);
 107    switch(VirtualMemoryInformationClass)
 108      {
 109      case MemoryBasicInformation:
 110        {
 111          PMEMORY_BASIC_INFORMATION Info =
 112            (PMEMORY_BASIC_INFORMATION)VirtualMemoryInformation;
 113
 114          if (Length != sizeof(MEMORY_BASIC_INFORMATION))
 115            {
 116              ObDereferenceObject(Process);
 117              return(STATUS_INFO_LENGTH_MISMATCH);
 118            }
 119
 120          if (MemoryArea == NULL)
 121            {
 122              Info->State = MEM_FREE;
 123              Info->BaseAddress = (PVOID)PAGE_ROUND_DOWN(Address);
 124              Status = STATUS_SUCCESS;
 125              ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
 126            }
 127          else if (MemoryArea->Type == MEMORY_AREA_VIRTUAL_MEMORY)
 128            {
 129              Status = MmQueryAnonMem(MemoryArea, Address, Info,
 130                                      &ResultLength);
 131            }
 132          else if (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW)
 133            {
 134              Status = MmQuerySectionView(MemoryArea, Address, Info,
 135                                          &ResultLength);
 136            }
 137          else
 138            {
 139              Status = STATUS_UNSUCCESSFUL;
 140              ResultLength = 0;
 141            }
 142          break;
 143        }
 144
 145      default:
 146        {
 147          Status = STATUS_INVALID_INFO_CLASS;
 148          ResultLength = 0;
 149          break;
 150        }
 151      }
 152
 153    MmUnlockAddressSpace(AddressSpace);
 154    ObDereferenceObject(Process);
 155    if (UnsafeResultLength != NULL)
 156      {
 157        MmCopyToCaller(UnsafeResultLength, &ResultLength, sizeof(ULONG));
 158      }
 159    return(Status);
 160 }
 161
 162 NTSTATUS STDCALL
 163 NtProtectVirtualMemory(IN       HANDLE  ProcessHandle,
 164                        IN       PVOID   BaseAddress,
 165                        IN       ULONG   NumberOfBytesToProtect,
 166                        IN       ULONG   NewAccessProtection,
 167                        OUT      PULONG  UnsafeOldAccessProtection)
 168 {
 169    PMEMORY_AREA MemoryArea;
 170    PEPROCESS Process;
 171    NTSTATUS Status;
 172    PMADDRESS_SPACE AddressSpace;
 173    ULONG OldAccessProtection;
 174
 175    NumberOfBytesToProtect =
 176      PAGE_ROUND_UP(BaseAddress + NumberOfBytesToProtect) -
 177      PAGE_ROUND_DOWN(BaseAddress);
 178    BaseAddress = (PVOID)PAGE_ROUND_DOWN(BaseAddress);
 179
 180    Status = ObReferenceObjectByHandle(ProcessHandle,
 181                                       PROCESS_VM_OPERATION,
 182                                       PsProcessType,
 183                                       UserMode,
 184                                       (PVOID*)(&Process),
 185                                       NULL);
 186    if (Status != STATUS_SUCCESS)
 187      {
 188         DPRINT("NtProtectVirtualMemory() = %x\n",Status);
 189         return(Status);
 190      }
 191
 192    AddressSpace = &Process->AddressSpace;
 193
 194    MmLockAddressSpace(AddressSpace);
 195    MemoryArea = MmOpenMemoryAreaByAddress(AddressSpace,
 196                                           BaseAddress);
 197    if (MemoryArea == NULL)
 198      {
 199        MmUnlockAddressSpace(AddressSpace);
 200        ObDereferenceObject(Process);
 201        return(STATUS_UNSUCCESSFUL);
 202      }
 203
 204    if (MemoryArea->Type == MEMORY_AREA_VIRTUAL_MEMORY)
 205      {
 206        Status = MmProtectAnonMem(AddressSpace, MemoryArea, BaseAddress,
 207                                  NumberOfBytesToProtect, NewAccessProtection,
 208                                  &OldAccessProtection);
 209      }
 210    else if (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW)
 211      {
 212        Status = MmProtectSectionView(AddressSpace, MemoryArea, BaseAddress,
 213                                      NumberOfBytesToProtect,
 214                                      NewAccessProtection,
 215                                      &OldAccessProtection);
 216      }
 217
 218    MmUnlockAddressSpace(AddressSpace);
 219    ObDereferenceObject(Process);
 220
 221    MmCopyToCaller(UnsafeOldAccessProtection, &OldAccessProtection,
 222                   sizeof(ULONG));
 223
 224    return(Status);
 225 }
 226
 227 NTSTATUS STDCALL
 228 NtReadVirtualMemory(IN  HANDLE  ProcessHandle,
 229                     IN  PVOID   BaseAddress,
 230                     OUT PVOID   Buffer,
 231                     IN  ULONG   NumberOfBytesToRead,
 232                     OUT PULONG  NumberOfBytesRead)
 233 {
 234   NTSTATUS Status;
 235   PMDL Mdl;
 236   PVOID SystemAddress;
 237   PEPROCESS Process;
 238
 239   DPRINT("NtReadVirtualMemory(ProcessHandle %x, BaseAddress %x, "
 240          "Buffer %x, NumberOfBytesToRead %d)\n",ProcessHandle,BaseAddress,
 241          Buffer,NumberOfBytesToRead);
 242
 243   Status = ObReferenceObjectByHandle(ProcessHandle,
 244                                      PROCESS_VM_WRITE,
 245                                      NULL,
 246                                      UserMode,
 247                                      (PVOID*)(&Process),
 248                                      NULL);
 249   if (Status != STATUS_SUCCESS)
 250     {
 251       return(Status);
 252     }
 253
 254   Mdl = MmCreateMdl(NULL,
 255                     Buffer,
 256                     NumberOfBytesToRead);
 257   MmProbeAndLockPages(Mdl,
 258                       UserMode,
 259                       IoWriteAccess);
 260
 261   KeAttachProcess(Process);
 262
 263   SystemAddress = MmGetSystemAddressForMdl(Mdl);
 264   memcpy(SystemAddress, BaseAddress, NumberOfBytesToRead);
 265
 266   KeDetachProcess();
 267
 268   if (Mdl->MappedSystemVa != NULL)
 269     {
 270       MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);
 271     }
 272   MmUnlockPages(Mdl);
 273   ExFreePool(Mdl);
 274
 275   ObDereferenceObject(Process);
 276
 277   *NumberOfBytesRead = NumberOfBytesToRead;
 278   return(STATUS_SUCCESS);
 279 }
 280
 281 NTSTATUS STDCALL
 282 NtUnlockVirtualMemory(HANDLE    ProcessHandle,
 283                       PVOID     BaseAddress,
 284                       ULONG     NumberOfBytesToUnlock,
 285                       PULONG NumberOfBytesUnlocked OPTIONAL)
 286 {
 287   UNIMPLEMENTED;
 288 }
 289
 290
 291 NTSTATUS STDCALL
 292 NtWriteVirtualMemory(IN HANDLE  ProcessHandle,
 293                      IN PVOID   BaseAddress,
 294                      IN PVOID   Buffer,
 295                      IN ULONG   NumberOfBytesToWrite,
 296                      OUT        PULONG  NumberOfBytesWritten)
 297 {
 298    NTSTATUS Status;
 299    PMDL Mdl;
 300    PVOID SystemAddress;
 301    PEPROCESS Process;
 302
 303    DPRINT("NtWriteVirtualMemory(ProcessHandle %x, BaseAddress %x, "
 304             "Buffer %x, NumberOfBytesToWrite %d)\n",ProcessHandle,BaseAddress,
 305             Buffer,NumberOfBytesToWrite);
 306
 307    Status = ObReferenceObjectByHandle(ProcessHandle,
 308                                       PROCESS_VM_WRITE,
 309                                       NULL,
 310                                       UserMode,
 311                                       (PVOID*)(&Process),
 312                                       NULL);
 313    if (Status != STATUS_SUCCESS)
 314      {
 315         return(Status);
 316      }
 317
 318    Mdl = MmCreateMdl(NULL,
 319                      Buffer,
 320                      NumberOfBytesToWrite);
 321    MmProbeAndLockPages(Mdl,
 322                        UserMode,
 323                        IoReadAccess);
 324
 325    KeAttachProcess(Process);
 326
 327    SystemAddress = MmGetSystemAddressForMdl(Mdl);
 328    memcpy(BaseAddress, SystemAddress, NumberOfBytesToWrite);
 329
 330    KeDetachProcess();
 331
 332    ObDereferenceObject(Process);
 333
 334    if (Mdl->MappedSystemVa != NULL)
 335      {
 336        MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);
 337      }
 338    MmUnlockPages(Mdl);
 339    ExFreePool(Mdl);
 340
 341    *NumberOfBytesWritten = NumberOfBytesToWrite;
 342
 343    return(STATUS_SUCCESS);
 344 }
 345
 346 DWORD STDCALL
 347 MmSecureVirtualMemory (DWORD    Unknown0,
 348                        DWORD    Unknown1,
 349                        DWORD    Unknown2)
 350 {
 351   UNIMPLEMENTED;
 352   return 0;
 353 }
 354
 355
 356 VOID STDCALL
 357 MmUnsecureVirtualMemory (DWORD Unknown0)
 358 {
 359   UNIMPLEMENTED;
 360 }
 361
 362 /* EOF */