Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-02-22 08:25:03 +00:00
Code Issues Projects Releases Packages Wiki Activity

[NTOS:IO/FSTUB] Fix the determination of 'SingleDisk' in IoGetBootDiskInformation().

Browse source 
The purpose of 'SingleDisk' is the same as in the IopCreateArcNames()
function. It is an optimization for that when looking up the
firmware-recognized ARC disks list, in order to match one of these with
the current NT disk being analysed (see e.g. also in IopCreateArcNamesDisk()),
we avoid a possible IopVerifyDiskSignature() call and directly build a
corresponding ARC name NT symbolic link for it.

'SingleDisk' will actually be TRUE, whether the DiskSignatureListHead
list is empty or contains only one element: Indeed in only both these
cases, 'DiskSignatureListHead.Flink->Flink' will refer to the list head.
(If the list is empty but 'SingleDisk' is TRUE, this does not matter,
because the DiskSignatureListHead looking-up loop never starts.)
This commit is contained in:
Hermès Bélusca-Maïto 2021-06-10 19:31:43 +02:00
parent 99078646c3
commit fdd74eb97e
No known key found for this signature in database
GPG key ID: 3B2539C65E7B93D0
2 changed files with 7 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
ntoskrnl/fstub/fstubex.c
View file

@ -1866,13 +1866,15 @@ IoGetBootDiskInformation(IN OUT PBOOTDISK_INFORMATION BootDiskInformation,
/* Init some useful stuff:
* Get ARC disks information
* Check whether we have a single disk
* Check whether we have a single disk on the machine
* Check received structure size (extended or not?)
* Init boot strings (system/boot)
* Finaly, get disk count
*/
ArcDiskInformation = IopLoaderBlock->ArcDiskInformation;
SingleDisk = IsListEmpty(&(ArcDiskInformation->DiskSignatureListHead));
SingleDisk = (ArcDiskInformation->DiskSignatureListHead.Flink->Flink ==
&ArcDiskInformation->DiskSignatureListHead);
IsBootDiskInfoEx = (Size >= sizeof(BOOTDISK_INFORMATION_EX));
RtlInitAnsiString(&ArcBootString, IopLoaderBlock->ArcBootDeviceName);
RtlInitAnsiString(&ArcSystemString, IopLoaderBlock->ArcHalDeviceName);
@ -2147,7 +2149,7 @@ IoGetBootDiskInformation(IN OUT PBOOTDISK_INFORMATION BootDiskInformation,
}
}
/* Finally, release drive layout structure */
/* Finally, release drive layout */
ExFreePool(DriveLayout);
}

4
ntoskrnl/io/iomgr/arcname.c
View file

@ -48,8 +48,8 @@ IopCreateArcNames(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
ANSI_STRING ArcSystemString, ArcString, LanmanRedirector, LoaderPathNameA;
/* Check if we only have one disk on the machine */
SingleDisk = ArcDiskInfo->DiskSignatureListHead.Flink->Flink ==
(&ArcDiskInfo->DiskSignatureListHead);
SingleDisk = (ArcDiskInfo->DiskSignatureListHead.Flink->Flink ==
&ArcDiskInfo->DiskSignatureListHead);
/* Create the global HAL partition name */
sprintf(Buffer, "\\ArcName\\%s", LoaderBlock->ArcHalDeviceName);