Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-02-25 01:39:30 +00:00
Code Issues Projects Releases Packages Wiki Activity

- Move SectionPageProtection checks from helper routines to NtCreateSection.

Browse source 
- Remove dependency on ReactOS specific FO_FCB_IS_VALID magic and don't access FCB directly, use NtQueryInformationFile instead.
- Fix deleting of section if an early failure during section creation happens and not all structures are initialized yet.

svn path=/trunk/; revision=10586
This commit is contained in:
Filip Navara 2004-08-18 02:29:37 +00:00
parent 04e70454de
commit f43bd6e656
1 changed files with 43 additions and 46 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

89
reactos/ntoskrnl/mm/section.c
View file

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: section.c,v 1.158 2004/08/15 16:39:08 chorns Exp $
/* $Id: section.c,v 1.159 2004/08/18 02:29:37 navaraf Exp $
*
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/mm/section.c
@ -2007,6 +2007,15 @@ MmpDeleteSection(PVOID ObjectBody)
ULONG RefCount;
PMM_SECTION_SEGMENT SectionSegments;
/*
* NOTE: Section->ImageSection can be NULL for short time
* during the section creating. If we fail for some reason
* until the image section is properly initialized we shouldn't
* process further here.
*/
if (Section->ImageSection == NULL)
return;
SectionSegments = Section->ImageSection->Segments;
NrSegments = Section->ImageSection->NrSegments;
@ -2029,6 +2038,13 @@ MmpDeleteSection(PVOID ObjectBody)
}
else
{
/*
* NOTE: Section->Segment can be NULL for short time
* during the section creating.
*/
if (Section->Segment == NULL)
return;
if (Section->Segment->Flags & MM_PAGEFILE_SEGMENT)
{
MmpFreePageFileSegment(Section->Segment);
@ -2172,15 +2188,6 @@ MmCreatePageFileSection(PSECTION_OBJECT *SectionObject,
}
MaximumSize = *UMaximumSize;
/*
* Check the protection
*/
if ((SectionPageProtection & PAGE_FLAGS_VALID_FROM_USER_MODE) !=
SectionPageProtection)
{
return(STATUS_INVALID_PAGE_PROTECTION);
}
/*
* Create the section
*/
@ -2203,6 +2210,7 @@ MmCreatePageFileSection(PSECTION_OBJECT *SectionObject,
*/
Section->SectionPageProtection = SectionPageProtection;
Section->AllocationAttributes = AllocationAttributes;
Section->Segment = NULL;
InitializeListHead(&Section->ViewListHead);
KeInitializeSpinLock(&Section->ViewListLock);
Section->FileObject = NULL;
@ -2253,15 +2261,8 @@ MmCreateDataFileSection(PSECTION_OBJECT *SectionObject,
IO_STATUS_BLOCK Iosb;
LARGE_INTEGER Offset;
CHAR Buffer;
FILE_STANDARD_INFORMATION FileInfo;
/*
* Check the protection
*/
if ((SectionPageProtection & PAGE_FLAGS_VALID_FROM_USER_MODE) !=
SectionPageProtection)
{
return(STATUS_INVALID_PAGE_PROTECTION);
}
/*
* Create the section
*/
@ -2284,6 +2285,7 @@ MmCreateDataFileSection(PSECTION_OBJECT *SectionObject,
*/
Section->SectionPageProtection = SectionPageProtection;
Section->AllocationAttributes = AllocationAttributes;
Section->Segment = NULL;
InitializeListHead(&Section->ViewListHead);
KeInitializeSpinLock(&Section->ViewListLock);
@ -2316,14 +2318,21 @@ MmCreateDataFileSection(PSECTION_OBJECT *SectionObject,
}
/*
* We can't do memory mappings if the file system doesn't support the
* standard FCB
* FIXME: This is propably not entirely correct. We can't look into
* the standard FCB header because it might not be initialized yet
* (as in case of the EXT2FS driver by Manoj Paul Joseph where the
* standard file information is filled on first request).
*/
if (!(FileObject->Flags & FO_FCB_IS_VALID))
Status = NtQueryInformationFile(FileHandle,
&Iosb,
&FileInfo,
sizeof(FILE_STANDARD_INFORMATION),
FileStandardInformation);
if (!NT_SUCCESS(Status))
{
ObDereferenceObject(Section);
ObDereferenceObject(FileObject);
return(STATUS_INVALID_FILE_FOR_SECTION);
return Status;
}
/*
@ -2336,12 +2345,10 @@ MmCreateDataFileSection(PSECTION_OBJECT *SectionObject,
}
else
{
MaximumSize =
((PFSRTL_COMMON_FCB_HEADER)FileObject->FsContext)->FileSize;
MaximumSize = FileInfo.EndOfFile;
}
if (MaximumSize.QuadPart >
((PFSRTL_COMMON_FCB_HEADER)FileObject->FsContext)->FileSize.QuadPart)
if (MaximumSize.QuadPart > FileInfo.EndOfFile.QuadPart)
{
Status = NtSetInformationFile(FileHandle,
&Iosb,
@ -2515,14 +2522,6 @@ MmCreateImageSection(PSECTION_OBJECT *SectionObject,
ULONG Size;
ULONG Characteristics;
ULONG FileAccess = 0;
/*
* Check the protection
*/
if ((SectionPageProtection & PAGE_FLAGS_VALID_FROM_USER_MODE) !=
SectionPageProtection)
{
return(STATUS_INVALID_PAGE_PROTECTION);
}
/*
* Specifying a maximum size is meaningless for an image section
@ -2673,6 +2672,7 @@ MmCreateImageSection(PSECTION_OBJECT *SectionObject,
*/
Section->SectionPageProtection = SectionPageProtection;
Section->AllocationAttributes = AllocationAttributes;
Section->ImageSection = NULL;
InitializeListHead(&Section->ViewListHead);
KeInitializeSpinLock(&Section->ViewListLock);
@ -2688,18 +2688,6 @@ MmCreateImageSection(PSECTION_OBJECT *SectionObject,
FileAccess = FILE_READ_DATA;
}
/*
* We can't do memory mappings if the file system doesn't support the
* standard FCB
*/
if (!(FileObject->Flags & FO_FCB_IS_VALID))
{
ObDereferenceObject(Section);
ObDereferenceObject(FileObject);
ExFreePool(ImageSections);
return(STATUS_INVALID_FILE_FOR_SECTION);
}
/*
* Lock the file
*/
@ -2927,6 +2915,15 @@ NtCreateSection (OUT PHANDLE SectionHandle,
PSECTION_OBJECT SectionObject;
NTSTATUS Status;
/*
* Check the protection
*/
if ((SectionPageProtection & PAGE_FLAGS_VALID_FROM_USER_MODE) !=
SectionPageProtection)
{
return(STATUS_INVALID_PAGE_PROTECTION);
}
Status = MmCreateSection(&SectionObject,
DesiredAccess,
ObjectAttributes,