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Sweden-Number/dlls/kernel/virtual.c

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/*
* Win32 virtual memory functions
*
* Copyright 1997 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <fcntl.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winnls.h"
#include "winternl.h"
#include "winerror.h"
#include "wine/exception.h"
#include "excpt.h"
#include "wine/debug.h"
#include "kernel_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(virtual);
WINE_DECLARE_DEBUG_CHANNEL(seh);
static unsigned int page_size;
/* filter for page-fault exceptions */
static WINE_EXCEPTION_FILTER(page_fault)
{
if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION)
return EXCEPTION_EXECUTE_HANDLER;
return EXCEPTION_CONTINUE_SEARCH;
}
/***********************************************************************
* VirtualAlloc (KERNEL32.@)
* Reserves or commits a region of pages in virtual address space
*
* RETURNS
* Base address of allocated region of pages
* NULL: Failure
*/
LPVOID WINAPI VirtualAlloc(
LPVOID addr, /* [in] Address of region to reserve or commit */
SIZE_T size, /* [in] Size of region */
DWORD type, /* [in] Type of allocation */
DWORD protect)/* [in] Type of access protection */
{
return VirtualAllocEx( GetCurrentProcess(), addr, size, type, protect );
}
/***********************************************************************
* VirtualAllocEx (KERNEL32.@)
*
* Seems to be just as VirtualAlloc, but with process handle.
*
* RETURNS
* Base address of allocated region of pages
* NULL: Failure
*/
LPVOID WINAPI VirtualAllocEx(
HANDLE hProcess, /* [in] Handle of process to do mem operation */
LPVOID addr, /* [in] Address of region to reserve or commit */
SIZE_T size, /* [in] Size of region */
DWORD type, /* [in] Type of allocation */
DWORD protect ) /* [in] Type of access protection */
{
LPVOID ret = addr;
NTSTATUS status;
if ((status = NtAllocateVirtualMemory( hProcess, &ret, 0, &size, type, protect )))
{
SetLastError( RtlNtStatusToDosError(status) );
ret = NULL;
}
return ret;
}
/***********************************************************************
* VirtualFree (KERNEL32.@)
* Release or decommits a region of pages in virtual address space.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualFree(
LPVOID addr, /* [in] Address of region of committed pages */
SIZE_T size, /* [in] Size of region */
DWORD type /* [in] Type of operation */
) {
return VirtualFreeEx( GetCurrentProcess(), addr, size, type );
}
/***********************************************************************
* VirtualFreeEx (KERNEL32.@)
* Release or decommits a region of pages in virtual address space.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualFreeEx( HANDLE process, LPVOID addr, SIZE_T size, DWORD type )
{
NTSTATUS status = NtFreeVirtualMemory( process, &addr, &size, type );
if (status) SetLastError( RtlNtStatusToDosError(status) );
return !status;
}
/***********************************************************************
* VirtualLock (KERNEL32.@)
* Locks the specified region of virtual address space
*
* NOTE
* Always returns TRUE
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualLock( LPVOID addr, /* [in] Address of first byte of range to lock */
SIZE_T size ) /* [in] Number of bytes in range to lock */
{
NTSTATUS status = NtLockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
if (status) SetLastError( RtlNtStatusToDosError(status) );
return !status;
}
/***********************************************************************
* VirtualUnlock (KERNEL32.@)
* Unlocks a range of pages in the virtual address space
*
* NOTE
* Always returns TRUE
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualUnlock( LPVOID addr, /* [in] Address of first byte of range */
SIZE_T size ) /* [in] Number of bytes in range */
{
NTSTATUS status = NtUnlockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
if (status) SetLastError( RtlNtStatusToDosError(status) );
return !status;
}
/***********************************************************************
* VirtualProtect (KERNEL32.@)
* Changes the access protection on a region of committed pages
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualProtect(
LPVOID addr, /* [in] Address of region of committed pages */
SIZE_T size, /* [in] Size of region */
DWORD new_prot, /* [in] Desired access protection */
LPDWORD old_prot /* [out] Address of variable to get old protection */
) {
return VirtualProtectEx( GetCurrentProcess(), addr, size, new_prot, old_prot );
}
/***********************************************************************
* VirtualProtectEx (KERNEL32.@)
* Changes the access protection on a region of committed pages in the
* virtual address space of a specified process
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualProtectEx(
HANDLE process, /* [in] Handle of process */
LPVOID addr, /* [in] Address of region of committed pages */
SIZE_T size, /* [in] Size of region */
DWORD new_prot, /* [in] Desired access protection */
LPDWORD old_prot /* [out] Address of variable to get old protection */ )
{
NTSTATUS status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
if (status) SetLastError( RtlNtStatusToDosError(status) );
return !status;
}
/***********************************************************************
* VirtualQuery (KERNEL32.@)
* Provides info about a range of pages in virtual address space
*
* RETURNS
* Number of bytes returned in information buffer
* or 0 if addr is >= 0xc0000000 (kernel space).
*/
SIZE_T WINAPI VirtualQuery(
LPCVOID addr, /* [in] Address of region */
PMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
SIZE_T len /* [in] Size of buffer */
) {
return VirtualQueryEx( GetCurrentProcess(), addr, info, len );
}
/***********************************************************************
* VirtualQueryEx (KERNEL32.@)
* Provides info about a range of pages in virtual address space of a
* specified process
*
* RETURNS
* Number of bytes returned in information buffer
*/
SIZE_T WINAPI VirtualQueryEx(
HANDLE process, /* [in] Handle of process */
LPCVOID addr, /* [in] Address of region */
PMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
SIZE_T len /* [in] Size of buffer */ )
{
SIZE_T ret;
NTSTATUS status;
if ((status = NtQueryVirtualMemory( process, addr, MemoryBasicInformation, info, len, &ret )))
{
SetLastError( RtlNtStatusToDosError(status) );
ret = 0;
}
return ret;
}
/***********************************************************************
* CreateFileMappingA (KERNEL32.@)
* Creates a named or unnamed file-mapping object for the specified file
*
* RETURNS
* Handle: Success
* 0: Mapping object does not exist
* NULL: Failure
*/
HANDLE WINAPI CreateFileMappingA(
HANDLE hFile, /* [in] Handle of file to map */
SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
DWORD protect, /* [in] Protection for mapping object */
DWORD size_high, /* [in] High-order 32 bits of object size */
DWORD size_low, /* [in] Low-order 32 bits of object size */
LPCSTR name /* [in] Name of file-mapping object */ )
{
WCHAR buffer[MAX_PATH];
if (!name) return CreateFileMappingW( hFile, sa, protect, size_high, size_low, NULL );
if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
{
SetLastError( ERROR_FILENAME_EXCED_RANGE );
return 0;
}
return CreateFileMappingW( hFile, sa, protect, size_high, size_low, buffer );
}
/***********************************************************************
* CreateFileMappingW (KERNEL32.@)
* See CreateFileMappingA.
*/
HANDLE WINAPI CreateFileMappingW( HANDLE hFile, LPSECURITY_ATTRIBUTES sa,
DWORD protect, DWORD size_high,
DWORD size_low, LPCWSTR name )
{
static const int sec_flags = SEC_FILE | SEC_IMAGE | SEC_RESERVE | SEC_COMMIT | SEC_NOCACHE;
HANDLE ret;
OBJECT_ATTRIBUTES attr;
UNICODE_STRING nameW;
NTSTATUS status;
DWORD access, sec_type;
LARGE_INTEGER size;
attr.Length = sizeof(attr);
attr.RootDirectory = 0;
attr.ObjectName = NULL;
attr.Attributes = OBJ_CASE_INSENSITIVE | OBJ_OPENIF |
((sa && sa->bInheritHandle) ? OBJ_INHERIT : 0);
attr.SecurityDescriptor = sa ? sa->lpSecurityDescriptor : NULL;
attr.SecurityQualityOfService = NULL;
if (name)
{
RtlInitUnicodeString( &nameW, name );
attr.ObjectName = &nameW;
attr.RootDirectory = get_BaseNamedObjects_handle();
}
sec_type = protect & sec_flags;
protect &= ~sec_flags;
if (!sec_type) sec_type = SEC_COMMIT;
switch(protect)
{
case 0:
protect = PAGE_READONLY; /* Win9x compatibility */
/* fall through */
case PAGE_READONLY:
case PAGE_WRITECOPY:
access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ;
break;
case PAGE_READWRITE:
access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE;
break;
default:
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
if (hFile == INVALID_HANDLE_VALUE)
{
hFile = 0;
if (!size_low && !size_high)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
}
size.u.LowPart = size_low;
size.u.HighPart = size_high;
status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
if (status == STATUS_OBJECT_NAME_EXISTS)
SetLastError( ERROR_ALREADY_EXISTS );
else
SetLastError( RtlNtStatusToDosError(status) );
return ret;
}
/***********************************************************************
* OpenFileMappingA (KERNEL32.@)
* Opens a named file-mapping object.
*
* RETURNS
* Handle: Success
* NULL: Failure
*/
HANDLE WINAPI OpenFileMappingA(
DWORD access, /* [in] Access mode */
BOOL inherit, /* [in] Inherit flag */
LPCSTR name ) /* [in] Name of file-mapping object */
{
WCHAR buffer[MAX_PATH];
if (!name) return OpenFileMappingW( access, inherit, NULL );
if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
{
SetLastError( ERROR_FILENAME_EXCED_RANGE );
return 0;
}
return OpenFileMappingW( access, inherit, buffer );
}
/***********************************************************************
* OpenFileMappingW (KERNEL32.@)
* See OpenFileMappingA.
*/
HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
{
OBJECT_ATTRIBUTES attr;
UNICODE_STRING nameW;
HANDLE ret;
NTSTATUS status;
if (!name)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
attr.Length = sizeof(attr);
attr.RootDirectory = get_BaseNamedObjects_handle();
attr.ObjectName = &nameW;
attr.Attributes = OBJ_CASE_INSENSITIVE | (inherit ? OBJ_INHERIT : 0);
attr.SecurityDescriptor = NULL;
attr.SecurityQualityOfService = NULL;
RtlInitUnicodeString( &nameW, name );
if (access == FILE_MAP_COPY) access = FILE_MAP_READ;
if ((status = NtOpenSection( &ret, access, &attr )))
{
SetLastError( RtlNtStatusToDosError(status) );
ret = 0;
}
return ret;
}
/***********************************************************************
* MapViewOfFile (KERNEL32.@)
* Maps a view of a file into the address space
*
* RETURNS
* Starting address of mapped view
* NULL: Failure
*/
LPVOID WINAPI MapViewOfFile(
HANDLE mapping, /* [in] File-mapping object to map */
DWORD access, /* [in] Access mode */
DWORD offset_high, /* [in] High-order 32 bits of file offset */
DWORD offset_low, /* [in] Low-order 32 bits of file offset */
SIZE_T count /* [in] Number of bytes to map */
) {
return MapViewOfFileEx( mapping, access, offset_high,
offset_low, count, NULL );
}
/***********************************************************************
* MapViewOfFileEx (KERNEL32.@)
* Maps a view of a file into the address space
*
* RETURNS
* Starting address of mapped view
* NULL: Failure
*/
LPVOID WINAPI MapViewOfFileEx(
HANDLE handle, /* [in] File-mapping object to map */
DWORD access, /* [in] Access mode */
DWORD offset_high, /* [in] High-order 32 bits of file offset */
DWORD offset_low, /* [in] Low-order 32 bits of file offset */
SIZE_T count, /* [in] Number of bytes to map */
LPVOID addr /* [in] Suggested starting address for mapped view */
) {
NTSTATUS status;
LARGE_INTEGER offset;
ULONG protect;
offset.u.LowPart = offset_low;
offset.u.HighPart = offset_high;
if (access & FILE_MAP_WRITE) protect = PAGE_READWRITE;
else if (access & FILE_MAP_READ) protect = PAGE_READONLY;
else if (access & FILE_MAP_COPY) protect = PAGE_WRITECOPY;
else protect = PAGE_NOACCESS;
if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
&count, ViewShare, 0, protect )))
{
SetLastError( RtlNtStatusToDosError(status) );
addr = NULL;
}
return addr;
}
/***********************************************************************
* UnmapViewOfFile (KERNEL32.@)
* Unmaps a mapped view of a file.
*
* NOTES
* Should addr be an LPCVOID?
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI UnmapViewOfFile( LPVOID addr ) /* [in] Address where mapped view begins */
{
NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), addr );
if (status) SetLastError( RtlNtStatusToDosError(status) );
return !status;
}
/***********************************************************************
* FlushViewOfFile (KERNEL32.@)
* Writes to the disk a byte range within a mapped view of a file
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI FlushViewOfFile( LPCVOID base, /* [in] Start address of byte range to flush */
SIZE_T size ) /* [in] Number of bytes in range */
{
NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
if (status)
{
if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
else SetLastError( RtlNtStatusToDosError(status) );
}
return !status;
}
/***********************************************************************
* IsBadReadPtr (KERNEL32.@)
*
* Check for read access on a memory block.
*
* RETURNS
* FALSE: Process has read access to entire block
* TRUE: Otherwise
*/
BOOL WINAPI IsBadReadPtr(
LPCVOID ptr, /* [in] Address of memory block */
UINT size ) /* [in] Size of block */
{
if (!size) return FALSE; /* handle 0 size case w/o reference */
if (!ptr) return TRUE;
if (!page_size) page_size = getpagesize();
__TRY
{
volatile const char *p = ptr;
char dummy;
UINT count = size;
while (count > page_size)
{
dummy = *p;
p += page_size;
count -= page_size;
}
dummy = p[0];
dummy = p[count - 1];
}
__EXCEPT(page_fault)
{
TRACE_(seh)("%p caused page fault during read\n", ptr);
return TRUE;
}
__ENDTRY
return FALSE;
}
/***********************************************************************
* IsBadWritePtr (KERNEL32.@)
*
* Check for write access on a memory block.
*
* RETURNS
* FALSE: Process has write access to entire block
* TRUE: Otherwise
*/
BOOL WINAPI IsBadWritePtr(
LPVOID ptr, /* [in] Address of memory block */
UINT size ) /* [in] Size of block in bytes */
{
if (!size) return FALSE; /* handle 0 size case w/o reference */
if (!ptr) return TRUE;
if (!page_size) page_size = getpagesize();
__TRY
{
volatile char *p = ptr;
UINT count = size;
while (count > page_size)
{
*p |= 0;
p += page_size;
count -= page_size;
}
p[0] |= 0;
p[count - 1] |= 0;
}
__EXCEPT(page_fault)
{
TRACE_(seh)("%p caused page fault during write\n", ptr);
return TRUE;
}
__ENDTRY
return FALSE;
}
/***********************************************************************
* IsBadHugeReadPtr (KERNEL32.@)
*
* Check for read access on a memory block.
*
* RETURNS
* FALSE: Process has read access to entire block
* TRUE: Otherwise
*/
BOOL WINAPI IsBadHugeReadPtr(
LPCVOID ptr, /* [in] Address of memory block */
UINT size /* [in] Size of block */
) {
return IsBadReadPtr( ptr, size );
}
/***********************************************************************
* IsBadHugeWritePtr (KERNEL32.@)
*
* Check for write access on a memory block.
*
* RETURNS
* FALSE: Process has write access to entire block
* TRUE: Otherwise
*/
BOOL WINAPI IsBadHugeWritePtr(
LPVOID ptr, /* [in] Address of memory block */
UINT size /* [in] Size of block */
) {
return IsBadWritePtr( ptr, size );
}
/***********************************************************************
* IsBadCodePtr (KERNEL32.@)
*
* Check for read access on a memory address.
*
* RETURNS
* FALSE: Process has read access to specified memory
* TRUE: Otherwise
*/
BOOL WINAPI IsBadCodePtr( FARPROC ptr ) /* [in] Address of function */
{
return IsBadReadPtr( ptr, 1 );
}
/***********************************************************************
* IsBadStringPtrA (KERNEL32.@)
*
* Check for read access on a range of memory pointed to by a string pointer.
*
* RETURNS
* FALSE: Read access to all bytes in string
* TRUE: Else
*/
BOOL WINAPI IsBadStringPtrA(
LPCSTR str, /* [in] Address of string */
UINT max ) /* [in] Maximum size of string */
{
if (!str) return TRUE;
__TRY
{
volatile const char *p = str;
while (p != str + max) if (!*p++) break;
}
__EXCEPT(page_fault)
{
TRACE_(seh)("%p caused page fault during read\n", str);
return TRUE;
}
__ENDTRY
return FALSE;
}
/***********************************************************************
* IsBadStringPtrW (KERNEL32.@)
* See IsBadStringPtrA.
*/
BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
{
if (!str) return TRUE;
__TRY
{
volatile const WCHAR *p = str;
while (p != str + max) if (!*p++) break;
}
__EXCEPT(page_fault)
{
TRACE_(seh)("%p caused page fault during read\n", str);
return TRUE;
}
__ENDTRY
return FALSE;
}
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