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[NTOSKRNL] Only allow page file on a few specific device types

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This commit is contained in:
Pierre Schweitzer 2018-08-16 19:00:22 +02:00
parent cc59c97308
commit 12e8d7fe0e
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GPG key ID: 7545556C3D585B0B
1 changed files with 12 additions and 0 deletions
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12
ntoskrnl/mm/pagefile.c
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@ -364,6 +364,7 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
SECURITY_DESCRIPTOR SecurityDescriptor;
PACL Dacl;
PWSTR Buffer;
DEVICE_TYPE DeviceType;
DPRINT("NtCreatePagingFile(FileName %wZ, MinimumSize %I64d)\n",
FileName, MinimumSize->QuadPart);
@ -727,6 +728,17 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
return Status;
}
/* Only allow page file on a few device types */
DeviceType = IoGetRelatedDeviceObject(FileObject)->DeviceType;
if (DeviceType != FILE_DEVICE_DISK_FILE_SYSTEM && DeviceType != FILE_DEVICE_NETWORK_FILE_SYSTEM &&
DeviceType != FILE_DEVICE_DFS_VOLUME && DeviceType != FILE_DEVICE_DFS_FILE_SYSTEM)
{
ObDereferenceObject(FileObject);
ZwClose(FileHandle);
ExFreePoolWithTag(Buffer, TAG_MM);
return Status;
}
/* Deny page file creation on a floppy disk */
FsDeviceInfo.Characteristics = 0;
IoQueryVolumeInformation(FileObject, FileFsDeviceInformation, sizeof(FsDeviceInfo), &FsDeviceInfo, &Count);