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[NTOSKRNL] Restrict rights on the page file

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This commit is contained in:
Pierre Schweitzer 2018-08-10 08:40:02 +02:00
parent 36c20dc56b
commit 28b4b419c2
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GPG key ID: 7545556C3D585B0B
1 changed files with 79 additions and 1 deletions
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80
ntoskrnl/mm/pagefile.c
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@ -505,6 +505,8 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
UNICODE_STRING CapturedFileName;
LARGE_INTEGER SafeInitialSize, SafeMaximumSize, AllocationSize;
FILE_FS_DEVICE_INFORMATION FsDeviceInfo;
SECURITY_DESCRIPTOR SecurityDescriptor;
PACL Dacl;
DPRINT("NtCreatePagingFile(FileName %wZ, InitialSize %I64d)\n",
FileName, InitialSize->QuadPart);
@ -564,11 +566,71 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
return(Status);
}
/* Create the security descriptor for the page file */
Status = RtlCreateSecurityDescriptor(&SecurityDescriptor, SECURITY_DESCRIPTOR_REVISION);
if (!NT_SUCCESS(Status))
{
ReleaseCapturedUnicodeString(&CapturedFileName,
PreviousMode);
return Status;
}
/* Create the DACL: we will only allow two SIDs */
Count = sizeof(ACL) + (sizeof(ACE) + RtlLengthSid(SeLocalSystemSid)) +
(sizeof(ACE) + RtlLengthSid(SeAliasAdminsSid));
Dacl = ExAllocatePoolWithTag(PagedPool, Count, 'lcaD');
if (Dacl == NULL)
{
ReleaseCapturedUnicodeString(&CapturedFileName,
PreviousMode);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Initialize the DACL */
Status = RtlCreateAcl(Dacl, Count, ACL_REVISION);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(Dacl, 'lcaD');
ReleaseCapturedUnicodeString(&CapturedFileName,
PreviousMode);
return Status;
}
/* Grant full access to admins */
Status = RtlAddAccessAllowedAce(Dacl, ACL_REVISION, FILE_ALL_ACCESS, SeAliasAdminsSid);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(Dacl, 'lcaD');
ReleaseCapturedUnicodeString(&CapturedFileName,
PreviousMode);
return Status;
}
/* Grant full access to SYSTEM */
Status = RtlAddAccessAllowedAce(Dacl, ACL_REVISION, FILE_ALL_ACCESS, SeLocalSystemSid);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(Dacl, 'lcaD');
ReleaseCapturedUnicodeString(&CapturedFileName,
PreviousMode);
return Status;
}
/* Attach the DACL to the security descriptor */
Status = RtlSetDaclSecurityDescriptor(&SecurityDescriptor, TRUE, Dacl, FALSE);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(Dacl, 'lcaD');
ReleaseCapturedUnicodeString(&CapturedFileName,
PreviousMode);
return Status;
}
InitializeObjectAttributes(&ObjectAttributes,
&CapturedFileName,
OBJ_KERNEL_HANDLE,
NULL,
NULL);
&SecurityDescriptor);
/* Make sure we can at least store a complete page:
* If we have 2048 BytesPerAllocationUnit (FAT16 < 128MB) there is
@ -620,9 +682,25 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName,
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed creating page file: %lx\n", Status);
ExFreePoolWithTag(Dacl, 'lcaD');
return(Status);
}
/* Set the security descriptor */
if (NT_SUCCESS(IoStatus.Status))
{
Status = ZwSetSecurityObject(FileHandle, DACL_SECURITY_INFORMATION, &SecurityDescriptor);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(Dacl, 'lcaD');
ZwClose(FileHandle);
return Status;
}
}
/* DACL is no longer needed, free it */
ExFreePoolWithTag(Dacl, 'lcaD');
Status = ZwQueryVolumeInformationFile(FileHandle,
&IoStatus,
&FsSizeInformation,