memory/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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <fcntl.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/types.h>
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif
  31
  32 #include "winnls.h"
  33 #include "winbase.h"
  34 #include "winternl.h"
  35 #include "winerror.h"
  36 #include "wine/exception.h"
  37 #include "msvcrt/excpt.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(virtual);
  41
  42 static unsigned int page_size;
  43
  44 /* filter for page-fault exceptions */
  45 static WINE_EXCEPTION_FILTER(page_fault)
  46 {
  47     if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION)
  48         return EXCEPTION_EXECUTE_HANDLER;
  49     return EXCEPTION_CONTINUE_SEARCH;
  50 }
  51
  52
  53 /***********************************************************************
  54  *             VirtualAlloc   (KERNEL32.@)
  55  * Reserves or commits a region of pages in virtual address space
  56  *
  57  * RETURNS
  58  *      Base address of allocated region of pages
  59  *      NULL: Failure
  60  */
  61 LPVOID WINAPI VirtualAlloc(
  62               LPVOID addr,  /* [in] Address of region to reserve or commit */
  63               DWORD size,   /* [in] Size of region */
  64               DWORD type,   /* [in] Type of allocation */
  65               DWORD protect)/* [in] Type of access protection */
  66 {
  67     return VirtualAllocEx( GetCurrentProcess(), addr, size, type, protect );
  68 }
  69
  70
  71 /***********************************************************************
  72  *             VirtualAllocEx   (KERNEL32.@)
  73  *
  74  * Seems to be just as VirtualAlloc, but with process handle.
  75  */
  76 LPVOID WINAPI VirtualAllocEx(
  77               HANDLE hProcess, /* [in] Handle of process to do mem operation */
  78               LPVOID addr,     /* [in] Address of region to reserve or commit */
  79               DWORD size,      /* [in] Size of region */
  80               DWORD type,      /* [in] Type of allocation */
  81               DWORD protect )  /* [in] Type of access protection */
  82 {
  83     LPVOID ret;
  84     NTSTATUS status;
  85
  86     if ((status = NtAllocateVirtualMemory( hProcess, &ret, addr, &size, type, protect )))
  87     {
  88         SetLastError( RtlNtStatusToDosError(status) );
  89         ret = NULL;
  90     }
  91     return ret;
  92 }
  93
  94
  95 /***********************************************************************
  96  *             VirtualFree   (KERNEL32.@)
  97  * Release or decommits a region of pages in virtual address space.
  98  *
  99  * RETURNS
 100  *      TRUE: Success
 101  *      FALSE: Failure
 102  */
 103 BOOL WINAPI VirtualFree(
 104               LPVOID addr, /* [in] Address of region of committed pages */
 105               DWORD size,  /* [in] Size of region */
 106               DWORD type   /* [in] Type of operation */
 107 ) {
 108     return VirtualFreeEx( GetCurrentProcess(), addr, size, type );
 109 }
 110
 111
 112 /***********************************************************************
 113  *             VirtualFreeEx   (KERNEL32.@)
 114  * Release or decommits a region of pages in virtual address space.
 115  *
 116  * RETURNS
 117  *      TRUE: Success
 118  *      FALSE: Failure
 119  */
 120 BOOL WINAPI VirtualFreeEx( HANDLE process, LPVOID addr, DWORD size, DWORD type )
 121 {
 122     NTSTATUS status = NtFreeVirtualMemory( process, &addr, &size, type );
 123     if (status) SetLastError( RtlNtStatusToDosError(status) );
 124     return !status;
 125 }
 126
 127
 128 /***********************************************************************
 129  *             VirtualLock   (KERNEL32.@)
 130  * Locks the specified region of virtual address space
 131  *
 132  * NOTE
 133  *      Always returns TRUE
 134  *
 135  * RETURNS
 136  *      TRUE: Success
 137  *      FALSE: Failure
 138  */
 139 BOOL WINAPI VirtualLock( LPVOID addr, /* [in] Address of first byte of range to lock */
 140                          DWORD size ) /* [in] Number of bytes in range to lock */
 141 {
 142     NTSTATUS status = NtLockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
 143     if (status) SetLastError( RtlNtStatusToDosError(status) );
 144     return !status;
 145 }
 146
 147
 148 /***********************************************************************
 149  *             VirtualUnlock   (KERNEL32.@)
 150  * Unlocks a range of pages in the virtual address space
 151  *
 152  * NOTE
 153  *      Always returns TRUE
 154  *
 155  * RETURNS
 156  *      TRUE: Success
 157  *      FALSE: Failure
 158  */
 159 BOOL WINAPI VirtualUnlock( LPVOID addr, /* [in] Address of first byte of range */
 160                            DWORD size ) /* [in] Number of bytes in range */
 161 {
 162     NTSTATUS status = NtUnlockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
 163     if (status) SetLastError( RtlNtStatusToDosError(status) );
 164     return !status;
 165 }
 166
 167
 168 /***********************************************************************
 169  *             VirtualProtect   (KERNEL32.@)
 170  * Changes the access protection on a region of committed pages
 171  *
 172  * RETURNS
 173  *      TRUE: Success
 174  *      FALSE: Failure
 175  */
 176 BOOL WINAPI VirtualProtect(
 177               LPVOID addr,     /* [in] Address of region of committed pages */
 178               DWORD size,      /* [in] Size of region */
 179               DWORD new_prot,  /* [in] Desired access protection */
 180               LPDWORD old_prot /* [out] Address of variable to get old protection */
 181 ) {
 182     return VirtualProtectEx( GetCurrentProcess(), addr, size, new_prot, old_prot );
 183 }
 184
 185
 186 /***********************************************************************
 187  *             VirtualProtectEx   (KERNEL32.@)
 188  * Changes the access protection on a region of committed pages in the
 189  * virtual address space of a specified process
 190  *
 191  * RETURNS
 192  *      TRUE: Success
 193  *      FALSE: Failure
 194  */
 195 BOOL WINAPI VirtualProtectEx(
 196               HANDLE process,  /* [in]  Handle of process */
 197               LPVOID addr,     /* [in]  Address of region of committed pages */
 198               DWORD size,      /* [in]  Size of region */
 199               DWORD new_prot,  /* [in]  Desired access protection */
 200               LPDWORD old_prot /* [out] Address of variable to get old protection */ )
 201 {
 202     NTSTATUS status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
 203     if (status) SetLastError( RtlNtStatusToDosError(status) );
 204     return !status;
 205 }
 206
 207
 208 /***********************************************************************
 209  *             VirtualQuery   (KERNEL32.@)
 210  * Provides info about a range of pages in virtual address space
 211  *
 212  * RETURNS
 213  *      Number of bytes returned in information buffer
 214  *      or 0 if addr is >= 0xc0000000 (kernel space).
 215  */
 216 DWORD WINAPI VirtualQuery(
 217              LPCVOID addr,                    /* [in]  Address of region */
 218              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 219              DWORD len                        /* [in]  Size of buffer */
 220 ) {
 221     return VirtualQueryEx( GetCurrentProcess(), addr, info, len );
 222 }
 223
 224
 225 /***********************************************************************
 226  *             VirtualQueryEx   (KERNEL32.@)
 227  * Provides info about a range of pages in virtual address space of a
 228  * specified process
 229  *
 230  * RETURNS
 231  *      Number of bytes returned in information buffer
 232  */
 233 DWORD WINAPI VirtualQueryEx(
 234              HANDLE process,                  /* [in] Handle of process */
 235              LPCVOID addr,                    /* [in] Address of region */
 236              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 237              DWORD len                        /* [in] Size of buffer */ )
 238 {
 239     DWORD ret;
 240     NTSTATUS status;
 241
 242     if ((status = NtQueryVirtualMemory( process, addr, MemoryBasicInformation, info, len, &ret )))
 243     {
 244         SetLastError( RtlNtStatusToDosError(status) );
 245         ret = 0;
 246     }
 247     return ret;
 248 }
 249
 250
 251 /***********************************************************************
 252  *             CreateFileMappingA   (KERNEL32.@)
 253  * Creates a named or unnamed file-mapping object for the specified file
 254  *
 255  * RETURNS
 256  *      Handle: Success
 257  *      0: Mapping object does not exist
 258  *      NULL: Failure
 259  */
 260 HANDLE WINAPI CreateFileMappingA(
 261                 HANDLE hFile,   /* [in] Handle of file to map */
 262                 SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
 263                 DWORD protect,   /* [in] Protection for mapping object */
 264                 DWORD size_high, /* [in] High-order 32 bits of object size */
 265                 DWORD size_low,  /* [in] Low-order 32 bits of object size */
 266                 LPCSTR name      /* [in] Name of file-mapping object */ )
 267 {
 268     WCHAR buffer[MAX_PATH];
 269
 270     if (!name) return CreateFileMappingW( hFile, sa, protect, size_high, size_low, NULL );
 271
 272     if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
 273     {
 274         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 275         return 0;
 276     }
 277     return CreateFileMappingW( hFile, sa, protect, size_high, size_low, buffer );
 278 }
 279
 280
 281 /***********************************************************************
 282  *             CreateFileMappingW   (KERNEL32.@)
 283  * See CreateFileMappingA
 284  */
 285 HANDLE WINAPI CreateFileMappingW( HANDLE hFile, LPSECURITY_ATTRIBUTES sa,
 286                                   DWORD protect, DWORD size_high,
 287                                   DWORD size_low, LPCWSTR name )
 288 {
 289     static const int sec_flags = SEC_FILE | SEC_IMAGE | SEC_RESERVE | SEC_COMMIT | SEC_NOCACHE;
 290
 291     HANDLE ret;
 292     OBJECT_ATTRIBUTES attr;
 293     UNICODE_STRING nameW;
 294     NTSTATUS status;
 295     DWORD access, sec_type;
 296     LARGE_INTEGER size;
 297
 298     attr.Length                   = sizeof(attr);
 299     attr.RootDirectory            = 0;
 300     attr.ObjectName               = NULL;
 301     attr.Attributes               = (sa && sa->bInheritHandle) ? OBJ_INHERIT : 0;
 302     attr.SecurityDescriptor       = sa ? sa->lpSecurityDescriptor : NULL;
 303     attr.SecurityQualityOfService = NULL;
 304
 305     if (name)
 306     {
 307         RtlInitUnicodeString( &nameW, name );
 308         attr.ObjectName = &nameW;
 309     }
 310
 311     sec_type = protect & sec_flags;
 312     protect &= ~sec_flags;
 313     if (!sec_type) sec_type = SEC_COMMIT;
 314
 315     switch(protect)
 316     {
 317     case 0:
 318     case PAGE_READONLY:
 319     case PAGE_WRITECOPY:
 320         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ;
 321         break;
 322     case PAGE_READWRITE:
 323         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE;
 324         break;
 325     default:
 326         SetLastError( ERROR_INVALID_PARAMETER );
 327         return 0;
 328     }
 329
 330     if (hFile == INVALID_HANDLE_VALUE)
 331     {
 332         hFile = 0;
 333         if (!size_low && !size_high)
 334         {
 335             SetLastError( ERROR_INVALID_PARAMETER );
 336             return 0;
 337         }
 338     }
 339
 340     size.s.LowPart  = size_low;
 341     size.s.HighPart = size_high;
 342
 343     status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
 344     SetLastError( RtlNtStatusToDosError(status) );
 345     return ret;
 346 }
 347
 348
 349 /***********************************************************************
 350  *             OpenFileMappingA   (KERNEL32.@)
 351  * Opens a named file-mapping object.
 352  *
 353  * RETURNS
 354  *      Handle: Success
 355  *      NULL: Failure
 356  */
 357 HANDLE WINAPI OpenFileMappingA(
 358                 DWORD access,   /* [in] Access mode */
 359                 BOOL inherit, /* [in] Inherit flag */
 360                 LPCSTR name )   /* [in] Name of file-mapping object */
 361 {
 362     WCHAR buffer[MAX_PATH];
 363
 364     if (!name) return OpenFileMappingW( access, inherit, NULL );
 365
 366     if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
 367     {
 368         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 369         return 0;
 370     }
 371     return OpenFileMappingW( access, inherit, buffer );
 372 }
 373
 374
 375 /***********************************************************************
 376  *             OpenFileMappingW   (KERNEL32.@)
 377  * See OpenFileMappingA
 378  */
 379 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
 380 {
 381     OBJECT_ATTRIBUTES attr;
 382     UNICODE_STRING nameW;
 383     HANDLE ret;
 384     NTSTATUS status;
 385
 386     if (!name)
 387     {
 388         SetLastError( ERROR_INVALID_PARAMETER );
 389         return 0;
 390     }
 391     attr.Length = sizeof(attr);
 392     attr.RootDirectory = 0;
 393     attr.ObjectName = &nameW;
 394     attr.Attributes = inherit ? OBJ_INHERIT : 0;
 395     attr.SecurityDescriptor = NULL;
 396     attr.SecurityQualityOfService = NULL;
 397     RtlInitUnicodeString( &nameW, name );
 398
 399     if (access == FILE_MAP_COPY) access = FILE_MAP_READ;
 400
 401     if ((status = NtOpenSection( &ret, access, &attr )))
 402     {
 403         SetLastError( RtlNtStatusToDosError(status) );
 404         ret = 0;
 405     }
 406     return ret;
 407 }
 408
 409
 410 /***********************************************************************
 411  *             MapViewOfFile   (KERNEL32.@)
 412  * Maps a view of a file into the address space
 413  *
 414  * RETURNS
 415  *      Starting address of mapped view
 416  *      NULL: Failure
 417  */
 418 LPVOID WINAPI MapViewOfFile(
 419               HANDLE mapping,  /* [in] File-mapping object to map */
 420               DWORD access,      /* [in] Access mode */
 421               DWORD offset_high, /* [in] High-order 32 bits of file offset */
 422               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
 423               DWORD count        /* [in] Number of bytes to map */
 424 ) {
 425     return MapViewOfFileEx( mapping, access, offset_high,
 426                             offset_low, count, NULL );
 427 }
 428
 429
 430 /***********************************************************************
 431  *             MapViewOfFileEx   (KERNEL32.@)
 432  * Maps a view of a file into the address space
 433  *
 434  * RETURNS
 435  *      Starting address of mapped view
 436  *      NULL: Failure
 437  */
 438 LPVOID WINAPI MapViewOfFileEx(
 439               HANDLE handle,   /* [in] File-mapping object to map */
 440               DWORD access,      /* [in] Access mode */
 441               DWORD offset_high, /* [in] High-order 32 bits of file offset */
 442               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
 443               DWORD count,       /* [in] Number of bytes to map */
 444               LPVOID addr        /* [in] Suggested starting address for mapped view */
 445 ) {
 446     NTSTATUS status;
 447     LARGE_INTEGER offset;
 448     ULONG protect;
 449
 450     offset.s.LowPart  = offset_low;
 451     offset.s.HighPart = offset_high;
 452
 453     if (access & FILE_MAP_WRITE) protect = PAGE_READWRITE;
 454     else if (access & FILE_MAP_READ) protect = PAGE_READONLY;
 455     else if (access & FILE_MAP_COPY) protect = PAGE_WRITECOPY;
 456     else protect = PAGE_NOACCESS;
 457
 458     if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
 459                                       &count, ViewShare, 0, protect )))
 460     {
 461         SetLastError( RtlNtStatusToDosError(status) );
 462         addr = NULL;
 463     }
 464     return addr;
 465 }
 466
 467
 468 /***********************************************************************
 469  *             UnmapViewOfFile   (KERNEL32.@)
 470  * Unmaps a mapped view of a file.
 471  *
 472  * NOTES
 473  *      Should addr be an LPCVOID?
 474  *
 475  * RETURNS
 476  *      TRUE: Success
 477  *      FALSE: Failure
 478  */
 479 BOOL WINAPI UnmapViewOfFile( LPVOID addr ) /* [in] Address where mapped view begins */
 480 {
 481     NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), addr );
 482     if (status) SetLastError( RtlNtStatusToDosError(status) );
 483     return !status;
 484 }
 485
 486
 487 /***********************************************************************
 488  *             FlushViewOfFile   (KERNEL32.@)
 489  * Writes to the disk a byte range within a mapped view of a file
 490  *
 491  * RETURNS
 492  *      TRUE: Success
 493  *      FALSE: Failure
 494  */
 495 BOOL WINAPI FlushViewOfFile( LPCVOID base,  /* [in] Start address of byte range to flush */
 496                              DWORD size )   /* [in] Number of bytes in range */
 497 {
 498     NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
 499     if (status)
 500     {
 501         if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
 502         else SetLastError( RtlNtStatusToDosError(status) );
 503     }
 504     return !status;
 505 }
 506
 507
 508 /***********************************************************************
 509  *             IsBadReadPtr   (KERNEL32.@)
 510  *
 511  * RETURNS
 512  *      FALSE: Process has read access to entire block
 513  *      TRUE: Otherwise
 514  */
 515 BOOL WINAPI IsBadReadPtr(
 516               LPCVOID ptr, /* [in] Address of memory block */
 517               UINT size )  /* [in] Size of block */
 518 {
 519     if (!size) return FALSE;  /* handle 0 size case w/o reference */
 520     if (!page_size) page_size = getpagesize();
 521     __TRY
 522     {
 523         volatile const char *p = ptr;
 524         char dummy;
 525         UINT count = size;
 526
 527         while (count > page_size)
 528         {
 529             dummy = *p;
 530             p += page_size;
 531             count -= page_size;
 532         }
 533         dummy = p[0];
 534         dummy = p[count - 1];
 535     }
 536     __EXCEPT(page_fault) { return TRUE; }
 537     __ENDTRY
 538     return FALSE;
 539 }
 540
 541
 542 /***********************************************************************
 543  *             IsBadWritePtr   (KERNEL32.@)
 544  *
 545  * RETURNS
 546  *      FALSE: Process has write access to entire block
 547  *      TRUE: Otherwise
 548  */
 549 BOOL WINAPI IsBadWritePtr(
 550               LPVOID ptr, /* [in] Address of memory block */
 551               UINT size ) /* [in] Size of block in bytes */
 552 {
 553     if (!size) return FALSE;  /* handle 0 size case w/o reference */
 554     if (!page_size) page_size = getpagesize();
 555     __TRY
 556     {
 557         volatile char *p = ptr;
 558         UINT count = size;
 559
 560         while (count > page_size)
 561         {
 562             *p |= 0;
 563             p += page_size;
 564             count -= page_size;
 565         }
 566         p[0] |= 0;
 567         p[count - 1] |= 0;
 568     }
 569     __EXCEPT(page_fault) { return TRUE; }
 570     __ENDTRY
 571     return FALSE;
 572 }
 573
 574
 575 /***********************************************************************
 576  *             IsBadHugeReadPtr   (KERNEL32.@)
 577  * RETURNS
 578  *      FALSE: Process has read access to entire block
 579  *      TRUE: Otherwise
 580  */
 581 BOOL WINAPI IsBadHugeReadPtr(
 582               LPCVOID ptr, /* [in] Address of memory block */
 583               UINT size  /* [in] Size of block */
 584 ) {
 585     return IsBadReadPtr( ptr, size );
 586 }
 587
 588
 589 /***********************************************************************
 590  *             IsBadHugeWritePtr   (KERNEL32.@)
 591  * RETURNS
 592  *      FALSE: Process has write access to entire block
 593  *      TRUE: Otherwise
 594  */
 595 BOOL WINAPI IsBadHugeWritePtr(
 596               LPVOID ptr, /* [in] Address of memory block */
 597               UINT size /* [in] Size of block */
 598 ) {
 599     return IsBadWritePtr( ptr, size );
 600 }
 601
 602
 603 /***********************************************************************
 604  *             IsBadCodePtr   (KERNEL32.@)
 605  *
 606  * RETURNS
 607  *      FALSE: Process has read access to specified memory
 608  *      TRUE: Otherwise
 609  */
 610 BOOL WINAPI IsBadCodePtr( FARPROC ptr ) /* [in] Address of function */
 611 {
 612     return IsBadReadPtr( ptr, 1 );
 613 }
 614
 615
 616 /***********************************************************************
 617  *             IsBadStringPtrA   (KERNEL32.@)
 618  *
 619  * RETURNS
 620  *      FALSE: Read access to all bytes in string
 621  *      TRUE: Else
 622  */
 623 BOOL WINAPI IsBadStringPtrA(
 624               LPCSTR str, /* [in] Address of string */
 625               UINT max )  /* [in] Maximum size of string */
 626 {
 627     __TRY
 628     {
 629         volatile const char *p = str;
 630         while (p != str + max) if (!*p++) break;
 631     }
 632     __EXCEPT(page_fault) { return TRUE; }
 633     __ENDTRY
 634     return FALSE;
 635 }
 636
 637
 638 /***********************************************************************
 639  *             IsBadStringPtrW   (KERNEL32.@)
 640  * See IsBadStringPtrA
 641  */
 642 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
 643 {
 644     __TRY
 645     {
 646         volatile const WCHAR *p = str;
 647         while (p != str + max) if (!*p++) break;
 648     }
 649     __EXCEPT(page_fault) { return TRUE; }
 650     __ENDTRY
 651     return FALSE;
 652 }