dlls/kernel32/virtual.c

   1 /*
   2  * Win32 virtual memory functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <fcntl.h>
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32
  33 #define NONAMELESSUNION
  34 #define NONAMELESSSTRUCT
  35 #include "ntstatus.h"
  36 #define WIN32_NO_STATUS
  37 #include "windef.h"
  38 #include "winbase.h"
  39 #include "winnls.h"
  40 #include "winternl.h"
  41 #include "winerror.h"
  42 #include "psapi.h"
  43 #include "wine/exception.h"
  44 #include "wine/debug.h"
  45
  46 #include "kernel_private.h"
  47
  48 WINE_DECLARE_DEBUG_CHANNEL(seh);
  49 WINE_DECLARE_DEBUG_CHANNEL(file);
  50
  51
  52 /***********************************************************************
  53  *             VirtualAlloc   (KERNEL32.@)
  54  *
  55  * Reserves or commits a region of pages in virtual address space.
  56  *
  57  * PARAMS
  58  *  addr    [I] Address of region to reserve or commit.
  59  *  size    [I] Size of region.
  60  *  type    [I] Type of allocation.
  61  *  protect [I] Type of access protection.
  62  *
  63  * RETURNS
  64  *      Success: Base address of allocated region of pages.
  65  *      Failure: NULL.
  66  */
  67 LPVOID WINAPI VirtualAlloc( LPVOID addr, SIZE_T size, DWORD type, DWORD protect )
  68 {
  69     return VirtualAllocEx( GetCurrentProcess(), addr, size, type, protect );
  70 }
  71
  72
  73 /***********************************************************************
  74  *             VirtualAllocEx   (KERNEL32.@)
  75  *
  76  * Seems to be just as VirtualAlloc, but with process handle.
  77  *
  78  * PARAMS
  79  *  hProcess [I] Handle to process to do mem operation.
  80  *  addr     [I] Address of region to reserve or commit.
  81  *  size     [I] Size of region.
  82  *  type     [I] Type of allocation.
  83  *  protect  [I] Type of access protection.
  84  *
  85  *
  86  * RETURNS
  87  *      Success: Base address of allocated region of pages.
  88  *      Failure: NULL.
  89  */
  90 LPVOID WINAPI VirtualAllocEx( HANDLE hProcess, LPVOID addr, SIZE_T size,
  91     DWORD type, DWORD protect )
  92 {
  93     LPVOID ret = addr;
  94     NTSTATUS status;
  95
  96     if ((status = NtAllocateVirtualMemory( hProcess, &ret, 0, &size, type, protect )))
  97     {
  98         SetLastError( RtlNtStatusToDosError(status) );
  99         ret = NULL;
 100     }
 101     return ret;
 102 }
 103
 104
 105 /***********************************************************************
 106  *             VirtualFree   (KERNEL32.@)
 107  *
 108  * Releases or decommits a region of pages in virtual address space.
 109  *
 110  * PARAMS
 111  *  addr [I] Address of region of committed pages.
 112  *  size [I] Size of region.
 113  *  type [I] Type of operation.
 114  *
 115  * RETURNS
 116  *      Success: TRUE.
 117  *      Failure: FALSE.
 118  */
 119 BOOL WINAPI VirtualFree( LPVOID addr, SIZE_T size, DWORD type )
 120 {
 121     return VirtualFreeEx( GetCurrentProcess(), addr, size, type );
 122 }
 123
 124
 125 /***********************************************************************
 126  *             VirtualFreeEx   (KERNEL32.@)
 127  *
 128  * Releases or decommits a region of pages in virtual address space.
 129  *
 130  * PARAMS
 131  *  process [I] Handle to process.
 132  *  addr    [I] Address of region to free.
 133  *  size    [I] Size of region.
 134  *  type    [I] Type of operation.
 135  *
 136  * RETURNS
 137  *      Success: TRUE.
 138  *      Failure: FALSE.
 139  */
 140 BOOL WINAPI VirtualFreeEx( HANDLE process, LPVOID addr, SIZE_T size, DWORD type )
 141 {
 142     NTSTATUS status = NtFreeVirtualMemory( process, &addr, &size, type );
 143     if (status) SetLastError( RtlNtStatusToDosError(status) );
 144     return !status;
 145 }
 146
 147
 148 /***********************************************************************
 149  *             VirtualLock   (KERNEL32.@)
 150  *
 151  * Locks the specified region of virtual address space.
 152  *
 153  * PARAMS
 154  *  addr [I] Address of first byte of range to lock.
 155  *  size [I] Number of bytes in range to lock.
 156  *
 157  * RETURNS
 158  *      Success: TRUE.
 159  *      Failure: FALSE.
 160  *
 161  * NOTES
 162  *      Always returns TRUE.
 163  *
 164  */
 165 BOOL WINAPI VirtualLock( LPVOID addr, SIZE_T size )
 166 {
 167     NTSTATUS status = NtLockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
 168     if (status) SetLastError( RtlNtStatusToDosError(status) );
 169     return !status;
 170 }
 171
 172
 173 /***********************************************************************
 174  *             VirtualUnlock   (KERNEL32.@)
 175  *
 176  * Unlocks a range of pages in the virtual address space.
 177  *
 178  * PARAMS
 179  *  addr [I] Address of first byte of range.
 180  *  size [I] Number of bytes in range.
 181  *
 182  * RETURNS
 183  *      Success: TRUE.
 184  *      Failure: FALSE.
 185  *
 186  * NOTES
 187  *      Always returns TRUE.
 188  *
 189  */
 190 BOOL WINAPI VirtualUnlock( LPVOID addr, SIZE_T size )
 191 {
 192     NTSTATUS status = NtUnlockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
 193     if (status) SetLastError( RtlNtStatusToDosError(status) );
 194     return !status;
 195 }
 196
 197
 198 /***********************************************************************
 199  *             VirtualProtect   (KERNEL32.@)
 200  *
 201  * Changes the access protection on a region of committed pages.
 202  *
 203  * PARAMS
 204  *  addr     [I] Address of region of committed pages.
 205  *  size     [I] Size of region.
 206  *  new_prot [I] Desired access protection.
 207  *  old_prot [O] Address of variable to get old protection.
 208  *
 209  * RETURNS
 210  *      Success: TRUE.
 211  *      Failure: FALSE.
 212  */
 213 BOOL WINAPI VirtualProtect( LPVOID addr, SIZE_T size, DWORD new_prot, LPDWORD old_prot)
 214 {
 215     return VirtualProtectEx( GetCurrentProcess(), addr, size, new_prot, old_prot );
 216 }
 217
 218
 219 /***********************************************************************
 220  *             VirtualProtectEx   (KERNEL32.@)
 221  *
 222  * Changes the access protection on a region of committed pages in the
 223  * virtual address space of a specified process.
 224  *
 225  * PARAMS
 226  *  process  [I] Handle of process.
 227  *  addr     [I] Address of region of committed pages.
 228  *  size     [I] Size of region.
 229  *  new_prot [I] Desired access protection.
 230  *  old_prot [O] Address of variable to get old protection.
 231  *
 232  * RETURNS
 233  *      Success: TRUE.
 234  *      Failure: FALSE.
 235  */
 236 BOOL WINAPI VirtualProtectEx( HANDLE process, LPVOID addr, SIZE_T size,
 237     DWORD new_prot, LPDWORD old_prot )
 238 {
 239     NTSTATUS status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
 240     if (status) SetLastError( RtlNtStatusToDosError(status) );
 241     return !status;
 242 }
 243
 244
 245 /***********************************************************************
 246  *             VirtualQuery   (KERNEL32.@)
 247  *
 248  * Provides info about a range of pages in virtual address space.
 249  *
 250  * PARAMS
 251  *  addr [I] Address of region.
 252  *  info [O] Address of info buffer.
 253  *  len  [I] Size of buffer.
 254  *
 255  * RETURNS
 256  *      Number of bytes returned in information buffer or 0 if
 257  *      addr >= 0xc0000000 (kernel space).
 258  */
 259 SIZE_T WINAPI VirtualQuery( LPCVOID addr, PMEMORY_BASIC_INFORMATION info,
 260     SIZE_T len )
 261 {
 262     return VirtualQueryEx( GetCurrentProcess(), addr, info, len );
 263 }
 264
 265
 266 /***********************************************************************
 267  *             VirtualQueryEx   (KERNEL32.@)
 268  *
 269  * Provides info about a range of pages in virtual address space of a
 270  * specified process.
 271  *
 272  * PARAMS
 273  *  process [I] Handle to process.
 274  *  addr    [I] Address of region.
 275  *  info    [O] Address of info buffer.
 276  *  len     [I] Size of buffer.
 277  *
 278  * RETURNS
 279  *      Number of bytes returned in information buffer.
 280  */
 281 SIZE_T WINAPI VirtualQueryEx( HANDLE process, LPCVOID addr,
 282     PMEMORY_BASIC_INFORMATION info, SIZE_T len )
 283 {
 284     SIZE_T ret;
 285     NTSTATUS status;
 286
 287     if ((status = NtQueryVirtualMemory( process, addr, MemoryBasicInformation, info, len, &ret )))
 288     {
 289         SetLastError( RtlNtStatusToDosError(status) );
 290         ret = 0;
 291     }
 292     return ret;
 293 }
 294
 295
 296 /***********************************************************************
 297  *             CreateFileMappingA   (KERNEL32.@)
 298  *
 299  * Creates a named or unnamed file-mapping object for the specified file.
 300  *
 301  * PARAMS
 302  *  hFile     [I] Handle to the file to map.
 303  *  sa        [I] Optional security attributes.
 304  *  protect   [I] Protection for mapping object.
 305  *  size_high [I] High-order 32 bits of object size.
 306  *  size_low  [I] Low-order 32 bits of object size.
 307  *  name      [I] Name of file-mapping object.
 308  *
 309  * RETURNS
 310  *      Success: Handle.
 311  *      Failure: NULL. Mapping object does not exist.
 312  */
 313 HANDLE WINAPI CreateFileMappingA( HANDLE hFile, SECURITY_ATTRIBUTES *sa,
 314     DWORD protect, DWORD size_high, DWORD size_low, LPCSTR name )
 315 {
 316     WCHAR buffer[MAX_PATH];
 317
 318     if (!name) return CreateFileMappingW( hFile, sa, protect, size_high, size_low, NULL );
 319
 320     if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
 321     {
 322         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 323         return 0;
 324     }
 325     return CreateFileMappingW( hFile, sa, protect, size_high, size_low, buffer );
 326 }
 327
 328
 329 /***********************************************************************
 330  *             CreateFileMappingW   (KERNEL32.@)
 331  *
 332  * See CreateFileMappingA.
 333  */
 334 HANDLE WINAPI CreateFileMappingW( HANDLE hFile, LPSECURITY_ATTRIBUTES sa,
 335                                   DWORD protect, DWORD size_high,
 336                                   DWORD size_low, LPCWSTR name )
 337 {
 338     static const int sec_flags = SEC_FILE | SEC_IMAGE | SEC_RESERVE | SEC_COMMIT | SEC_NOCACHE;
 339
 340     HANDLE ret;
 341     NTSTATUS status;
 342     DWORD access, sec_type;
 343     LARGE_INTEGER size;
 344
 345     sec_type = protect & sec_flags;
 346     protect &= ~sec_flags;
 347     if (!sec_type) sec_type = SEC_COMMIT;
 348
 349     /* Win9x compatibility */
 350     if (!protect && (GetVersion() & 0x80000000)) protect = PAGE_READONLY;
 351
 352     switch(protect)
 353     {
 354     case PAGE_READONLY:
 355     case PAGE_WRITECOPY:
 356         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_EXECUTE;
 357         break;
 358     case PAGE_READWRITE:
 359         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE | SECTION_MAP_EXECUTE;
 360         break;
 361     case PAGE_EXECUTE_READ:
 362     case PAGE_EXECUTE_WRITECOPY:
 363         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_EXECUTE | SECTION_MAP_EXECUTE_EXPLICIT;
 364         break;
 365     case PAGE_EXECUTE_READWRITE:
 366         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE | SECTION_MAP_EXECUTE | SECTION_MAP_EXECUTE_EXPLICIT;
 367         break;
 368     default:
 369         SetLastError( ERROR_INVALID_PARAMETER );
 370         return 0;
 371     }
 372
 373     if (hFile == INVALID_HANDLE_VALUE)
 374     {
 375         hFile = 0;
 376         if (!size_low && !size_high)
 377         {
 378             SetLastError( ERROR_INVALID_PARAMETER );
 379             return 0;
 380         }
 381     }
 382
 383     size.u.LowPart  = size_low;
 384     size.u.HighPart = size_high;
 385
 386     if (sa || name)
 387     {
 388         OBJECT_ATTRIBUTES attr;
 389         UNICODE_STRING nameW;
 390
 391         attr.Length                   = sizeof(attr);
 392         attr.RootDirectory            = 0;
 393         attr.ObjectName               = NULL;
 394         attr.Attributes               = OBJ_OPENIF | ((sa && sa->bInheritHandle) ? OBJ_INHERIT : 0);
 395         attr.SecurityDescriptor       = sa ? sa->lpSecurityDescriptor : NULL;
 396         attr.SecurityQualityOfService = NULL;
 397         if (name)
 398         {
 399             RtlInitUnicodeString( &nameW, name );
 400             attr.ObjectName = &nameW;
 401             attr.RootDirectory = get_BaseNamedObjects_handle();
 402         }
 403         status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
 404     }
 405     else status = NtCreateSection( &ret, access, NULL, &size, protect, sec_type, hFile );
 406
 407     if (status == STATUS_OBJECT_NAME_EXISTS)
 408         SetLastError( ERROR_ALREADY_EXISTS );
 409     else
 410         SetLastError( RtlNtStatusToDosError(status) );
 411     return ret;
 412 }
 413
 414
 415 /***********************************************************************
 416  *             OpenFileMappingA   (KERNEL32.@)
 417  *
 418  * Opens a named file-mapping object.
 419  *
 420  * PARAMS
 421  *  access  [I] Access mode.
 422  *  inherit [I] Inherit flag.
 423  *  name    [I] Name of file-mapping object.
 424  *
 425  * RETURNS
 426  *      Success: Handle.
 427  *      Failure: NULL.
 428  */
 429 HANDLE WINAPI OpenFileMappingA( DWORD access, BOOL inherit, LPCSTR name )
 430 {
 431     WCHAR buffer[MAX_PATH];
 432
 433     if (!name) return OpenFileMappingW( access, inherit, NULL );
 434
 435     if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
 436     {
 437         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 438         return 0;
 439     }
 440     return OpenFileMappingW( access, inherit, buffer );
 441 }
 442
 443
 444 /***********************************************************************
 445  *             OpenFileMappingW   (KERNEL32.@)
 446  *
 447  * See OpenFileMappingA.
 448  */
 449 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
 450 {
 451     OBJECT_ATTRIBUTES attr;
 452     UNICODE_STRING nameW;
 453     HANDLE ret;
 454     NTSTATUS status;
 455
 456     if (!name)
 457     {
 458         SetLastError( ERROR_INVALID_PARAMETER );
 459         return 0;
 460     }
 461     attr.Length = sizeof(attr);
 462     attr.RootDirectory = get_BaseNamedObjects_handle();
 463     attr.ObjectName = &nameW;
 464     attr.Attributes = inherit ? OBJ_INHERIT : 0;
 465     attr.SecurityDescriptor = NULL;
 466     attr.SecurityQualityOfService = NULL;
 467     RtlInitUnicodeString( &nameW, name );
 468
 469     if (access == FILE_MAP_COPY) access = SECTION_MAP_READ;
 470     access |= SECTION_QUERY;
 471
 472     if (GetVersion() & 0x80000000)
 473     {
 474         /* win9x doesn't do access checks, so try with full access first */
 475         if (!NtOpenSection( &ret, access | SECTION_MAP_READ | SECTION_MAP_WRITE, &attr )) return ret;
 476     }
 477
 478     if ((status = NtOpenSection( &ret, access, &attr )))
 479     {
 480         SetLastError( RtlNtStatusToDosError(status) );
 481         ret = 0;
 482     }
 483     return ret;
 484 }
 485
 486
 487 /***********************************************************************
 488  *             MapViewOfFile   (KERNEL32.@)
 489  *
 490  * Maps a view of a file into the address space.
 491  *
 492  * PARAMS
 493  *  mapping     [I] File-mapping object to map.
 494  *  access      [I] Access mode.
 495  *  offset_high [I] High-order 32 bits of file offset.
 496  *  offset_low  [I] Low-order 32 bits of file offset.
 497  *  count       [I] Number of bytes to map.
 498  *
 499  * RETURNS
 500  *      Success: Starting address of mapped view.
 501  *      Failure: NULL.
 502  */
 503 LPVOID WINAPI MapViewOfFile( HANDLE mapping, DWORD access,
 504     DWORD offset_high, DWORD offset_low, SIZE_T count )
 505 {
 506     return MapViewOfFileEx( mapping, access, offset_high,
 507                             offset_low, count, NULL );
 508 }
 509
 510
 511 /***********************************************************************
 512  *             MapViewOfFileEx   (KERNEL32.@)
 513  *
 514  * Maps a view of a file into the address space.
 515  *
 516  * PARAMS
 517  *  handle      [I] File-mapping object to map.
 518  *  access      [I] Access mode.
 519  *  offset_high [I] High-order 32 bits of file offset.
 520  *  offset_low  [I] Low-order 32 bits of file offset.
 521  *  count       [I] Number of bytes to map.
 522  *  addr        [I] Suggested starting address for mapped view.
 523  *
 524  * RETURNS
 525  *      Success: Starting address of mapped view.
 526  *      Failure: NULL.
 527  */
 528 LPVOID WINAPI MapViewOfFileEx( HANDLE handle, DWORD access,
 529     DWORD offset_high, DWORD offset_low, SIZE_T count, LPVOID addr )
 530 {
 531     NTSTATUS status;
 532     LARGE_INTEGER offset;
 533     ULONG protect;
 534     BOOL exec;
 535
 536     offset.u.LowPart  = offset_low;
 537     offset.u.HighPart = offset_high;
 538
 539     exec = access & FILE_MAP_EXECUTE;
 540     access &= ~FILE_MAP_EXECUTE;
 541
 542     if (access == FILE_MAP_COPY)
 543         protect = exec ? PAGE_EXECUTE_WRITECOPY : PAGE_WRITECOPY;
 544     else if (access & FILE_MAP_WRITE)
 545         protect = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
 546     else if (access & FILE_MAP_READ)
 547         protect = exec ? PAGE_EXECUTE_READ : PAGE_READONLY;
 548     else protect = PAGE_NOACCESS;
 549
 550     if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
 551                                       &count, ViewShare, 0, protect )) < 0)
 552     {
 553         SetLastError( RtlNtStatusToDosError(status) );
 554         addr = NULL;
 555     }
 556     return addr;
 557 }
 558
 559
 560 /***********************************************************************
 561  *             UnmapViewOfFile   (KERNEL32.@)
 562  *
 563  * Unmaps a mapped view of a file.
 564  *
 565  * PARAMS
 566  *  addr [I] Address where mapped view begins.
 567  *
 568  * RETURNS
 569  *      Success: TRUE.
 570  *      Failure: FALSE.
 571  *
 572  */
 573 BOOL WINAPI UnmapViewOfFile( LPCVOID addr )
 574 {
 575     NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
 576     if (status) SetLastError( RtlNtStatusToDosError(status) );
 577     return !status;
 578 }
 579
 580
 581 /***********************************************************************
 582  *             FlushViewOfFile   (KERNEL32.@)
 583  *
 584  * Writes to the disk a byte range within a mapped view of a file.
 585  *
 586  * PARAMS
 587  *  base [I] Start address of byte range to flush.
 588  *  size [I] Number of bytes in range.
 589  *
 590  * RETURNS
 591  *      Success: TRUE.
 592  *      Failure: FALSE.
 593  */
 594 BOOL WINAPI FlushViewOfFile( LPCVOID base, SIZE_T size )
 595 {
 596     NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
 597     if (status)
 598     {
 599         if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
 600         else SetLastError( RtlNtStatusToDosError(status) );
 601     }
 602     return !status;
 603 }
 604
 605
 606 /***********************************************************************
 607  *             GetWriteWatch   (KERNEL32.@)
 608  */
 609 UINT WINAPI GetWriteWatch( DWORD flags, LPVOID base, SIZE_T size, LPVOID *addresses,
 610                            ULONG_PTR *count, ULONG *granularity )
 611 {
 612     NTSTATUS status;
 613
 614     status = NtGetWriteWatch( GetCurrentProcess(), flags, base, size, addresses, count, granularity );
 615     if (status) SetLastError( RtlNtStatusToDosError(status) );
 616     return status ? ~0u : 0;
 617 }
 618
 619
 620 /***********************************************************************
 621  *             ResetWriteWatch   (KERNEL32.@)
 622  */
 623 UINT WINAPI ResetWriteWatch( LPVOID base, SIZE_T size )
 624 {
 625     NTSTATUS status;
 626
 627     status = NtResetWriteWatch( GetCurrentProcess(), base, size );
 628     if (status) SetLastError( RtlNtStatusToDosError(status) );
 629     return status ? ~0u : 0;
 630 }
 631
 632
 633 /***********************************************************************
 634  *             IsBadReadPtr   (KERNEL32.@)
 635  *
 636  * Check for read access on a memory block.
 637  *
 638  * ptr  [I] Address of memory block.
 639  * size [I] Size of block.
 640  *
 641  * RETURNS
 642  *  Success: TRUE.
 643  *      Failure: FALSE. Process has read access to entire block.
 644  */
 645 BOOL WINAPI IsBadReadPtr( LPCVOID ptr, UINT size )
 646 {
 647     if (!size) return FALSE;  /* handle 0 size case w/o reference */
 648     if (!ptr) return TRUE;
 649     __TRY
 650     {
 651         volatile const char *p = ptr;
 652         char dummy __attribute__((unused));
 653         UINT count = size;
 654
 655         while (count > system_info.PageSize)
 656         {
 657             dummy = *p;
 658             p += system_info.PageSize;
 659             count -= system_info.PageSize;
 660         }
 661         dummy = p[0];
 662         dummy = p[count - 1];
 663     }
 664     __EXCEPT_PAGE_FAULT
 665     {
 666         TRACE_(seh)("%p caused page fault during read\n", ptr);
 667         return TRUE;
 668     }
 669     __ENDTRY
 670     return FALSE;
 671 }
 672
 673
 674 /***********************************************************************
 675  *             IsBadWritePtr   (KERNEL32.@)
 676  *
 677  * Check for write access on a memory block.
 678  *
 679  * PARAMS
 680  *  ptr  [I] Address of memory block.
 681  *  size [I] Size of block in bytes.
 682  *
 683  * RETURNS
 684  *  Success: TRUE.
 685  *      Failure: FALSE. Process has write access to entire block.
 686  */
 687 BOOL WINAPI IsBadWritePtr( LPVOID ptr, UINT size )
 688 {
 689     if (!size) return FALSE;  /* handle 0 size case w/o reference */
 690     if (!ptr) return TRUE;
 691     __TRY
 692     {
 693         volatile char *p = ptr;
 694         UINT count = size;
 695
 696         while (count > system_info.PageSize)
 697         {
 698             *p |= 0;
 699             p += system_info.PageSize;
 700             count -= system_info.PageSize;
 701         }
 702         p[0] |= 0;
 703         p[count - 1] |= 0;
 704     }
 705     __EXCEPT_PAGE_FAULT
 706     {
 707         TRACE_(seh)("%p caused page fault during write\n", ptr);
 708         return TRUE;
 709     }
 710     __ENDTRY
 711     return FALSE;
 712 }
 713
 714
 715 /***********************************************************************
 716  *             IsBadHugeReadPtr   (KERNEL32.@)
 717  *
 718  * Check for read access on a memory block.
 719  *
 720  * PARAMS
 721  *  ptr  [I] Address of memory block.
 722  *  size [I] Size of block.
 723  *
 724  * RETURNS
 725  *  Success: TRUE.
 726  *      Failure: FALSE. Process has read access to entire block.
 727  */
 728 BOOL WINAPI IsBadHugeReadPtr( LPCVOID ptr, UINT size )
 729 {
 730     return IsBadReadPtr( ptr, size );
 731 }
 732
 733
 734 /***********************************************************************
 735  *             IsBadHugeWritePtr   (KERNEL32.@)
 736  *
 737  * Check for write access on a memory block.
 738  *
 739  * PARAMS
 740  *  ptr  [I] Address of memory block.
 741  *  size [I] Size of block.
 742  *
 743  * RETURNS
 744  *  Success: TRUE.
 745  *      Failure: FALSE. Process has write access to entire block.
 746  */
 747 BOOL WINAPI IsBadHugeWritePtr( LPVOID ptr, UINT size )
 748 {
 749     return IsBadWritePtr( ptr, size );
 750 }
 751
 752
 753 /***********************************************************************
 754  *             IsBadCodePtr   (KERNEL32.@)
 755  *
 756  * Check for read access on a memory address.
 757  *
 758  * PARAMS
 759  *  ptr [I] Address of function.
 760  *
 761  * RETURNS
 762  *      Success: TRUE.
 763  *      Failure: FALSE. Process has read access to specified memory.
 764  */
 765 BOOL WINAPI IsBadCodePtr( FARPROC ptr )
 766 {
 767     return IsBadReadPtr( ptr, 1 );
 768 }
 769
 770
 771 /***********************************************************************
 772  *             IsBadStringPtrA   (KERNEL32.@)
 773  *
 774  * Check for read access on a range of memory pointed to by a string pointer.
 775  *
 776  * PARAMS
 777  *  str [I] Address of string.
 778  *  max [I] Maximum size of string.
 779  *
 780  * RETURNS
 781  *      Success: TRUE.
 782  *      Failure: FALSE. Read access to all bytes in string.
 783  */
 784 BOOL WINAPI IsBadStringPtrA( LPCSTR str, UINT max )
 785 {
 786     if (!str) return TRUE;
 787
 788     __TRY
 789     {
 790         volatile const char *p = str;
 791         while (p != str + max) if (!*p++) break;
 792     }
 793     __EXCEPT_PAGE_FAULT
 794     {
 795         TRACE_(seh)("%p caused page fault during read\n", str);
 796         return TRUE;
 797     }
 798     __ENDTRY
 799     return FALSE;
 800 }
 801
 802
 803 /***********************************************************************
 804  *             IsBadStringPtrW   (KERNEL32.@)
 805  *
 806  * See IsBadStringPtrA.
 807  */
 808 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
 809 {
 810     if (!str) return TRUE;
 811
 812     __TRY
 813     {
 814         volatile const WCHAR *p = str;
 815         while (p != str + max) if (!*p++) break;
 816     }
 817     __EXCEPT_PAGE_FAULT
 818     {
 819         TRACE_(seh)("%p caused page fault during read\n", str);
 820         return TRUE;
 821     }
 822     __ENDTRY
 823     return FALSE;
 824 }
 825
 826 /***********************************************************************
 827  *           K32GetMappedFileNameA (KERNEL32.@)
 828  */
 829 DWORD WINAPI K32GetMappedFileNameA(HANDLE process, LPVOID lpv, LPSTR file_name, DWORD size)
 830 {
 831     FIXME_(file)("(%p, %p, %p, %d): stub\n", process, lpv, file_name, size);
 832
 833     if (file_name && size)
 834         file_name[0] = '\0';
 835
 836     return 0;
 837 }
 838
 839 /***********************************************************************
 840  *           K32GetMappedFileNameW (KERNEL32.@)
 841  */
 842 DWORD WINAPI K32GetMappedFileNameW(HANDLE process, LPVOID lpv, LPWSTR file_name, DWORD size)
 843 {
 844     FIXME_(file)("(%p, %p, %p, %d): stub\n", process, lpv, file_name, size);
 845
 846     if (file_name && size)
 847         file_name[0] = '\0';
 848
 849     return 0;
 850 }
 851
 852 /***********************************************************************
 853  *           K32EnumPageFilesA (KERNEL32.@)
 854  */
 855 BOOL WINAPI K32EnumPageFilesA( PENUM_PAGE_FILE_CALLBACKA callback, LPVOID context )
 856 {
 857     FIXME_(file)("(%p, %p) stub\n", callback, context );
 858     return FALSE;
 859 }
 860
 861 /***********************************************************************
 862  *           K32EnumPageFilesW (KERNEL32.@)
 863  */
 864 BOOL WINAPI K32EnumPageFilesW( PENUM_PAGE_FILE_CALLBACKW callback, LPVOID context )
 865 {
 866     FIXME_(file)("(%p, %p) stub\n", callback, context );
 867     return FALSE;
 868 }
 869
 870 /***********************************************************************
 871  *           K32GetWsChanges (KERNEL32.@)
 872  */
 873 BOOL WINAPI K32GetWsChanges(HANDLE process, PPSAPI_WS_WATCH_INFORMATION watchinfo, DWORD size)
 874 {
 875     NTSTATUS status;
 876
 877     TRACE_(seh)("(%p, %p, %d)\n", process, watchinfo, size);
 878
 879     status = NtQueryInformationProcess( process, ProcessWorkingSetWatch, watchinfo, size, NULL );
 880
 881     if (status)
 882     {
 883         SetLastError( RtlNtStatusToDosError( status ) );
 884         return FALSE;
 885     }
 886     return TRUE;
 887 }
 888
 889 /***********************************************************************
 890  *           K32InitializeProcessForWsWatch (KERNEL32.@)
 891  */
 892 BOOL WINAPI K32InitializeProcessForWsWatch(HANDLE process)
 893 {
 894     FIXME_(seh)("(process=%p): stub\n", process);
 895
 896     return TRUE;
 897 }