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added helper functions ObpCaptureObjectAttributes() and ObpReleaseObjectAttributes() to be used to safely capture OBJECT_ATTRIBUTES structures

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svn path=/trunk/; revision=13179
This commit is contained in:
Thomas Bluemel 2005-01-21 10:28:13 +00:00
parent d183d616d0
commit f15230fffc
2 changed files with 295 additions and 0 deletions
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24
reactos/ntoskrnl/include/internal/ob.h
View file

@ -315,5 +315,29 @@ ObpReferenceCachedSecurityDescriptor(IN PSECURITY_DESCRIPTOR SecurityDescriptor)
VOID
ObpDereferenceCachedSecurityDescriptor(IN PSECURITY_DESCRIPTOR SecurityDescriptor);
/* Secure object information functions */
typedef struct _CAPTURED_OBJECT_ATTRIBUTES
{
HANDLE RootDirectory;
ULONG Attributes;
PSECURITY_DESCRIPTOR SecurityDescriptor;
/* PVOID SecurityQualityOfService; */
} CAPTURED_OBJECT_ATTRIBUTES, *PCAPTURED_OBJECT_ATTRIBUTES;
NTSTATUS
ObpCaptureObjectAttributes(IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL,
IN POBJECT_TYPE ObjectType,
IN KPROCESSOR_MODE AccessMode,
IN BOOLEAN CaptureIfKernel,
OUT PCAPTURED_OBJECT_ATTRIBUTES CapturedObjectAttributes OPTIONAL,
OUT PUNICODE_STRING ObjectName OPTIONAL);
VOID
ObpReleaseObjectAttributes(IN PCAPTURED_OBJECT_ATTRIBUTES CapturedObjectAttributes OPTIONAL,
IN PUNICODE_STRING ObjectName OPTIONAL,
IN KPROCESSOR_MODE AccessMode,
IN BOOLEAN CaptureIfKernel);
#endif /* __INCLUDE_INTERNAL_OBJMGR_H */

271
reactos/ntoskrnl/ob/object.c
View file

@ -39,6 +39,256 @@ POBJECT_HEADER BODY_TO_HEADER(PVOID body)
return(CONTAINING_RECORD((&(chdr->Type)),OBJECT_HEADER,Type));
}
NTSTATUS
ObpCaptureObjectAttributes(IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL,
IN POBJECT_TYPE ObjectType,
IN KPROCESSOR_MODE AccessMode,
IN BOOLEAN CaptureIfKernel,
OUT PCAPTURED_OBJECT_ATTRIBUTES CapturedObjectAttributes OPTIONAL,
OUT PUNICODE_STRING ObjectName OPTIONAL)
{
OBJECT_ATTRIBUTES AttributesCopy;
NTSTATUS Status = STATUS_SUCCESS;
/* at least one output parameter must be != NULL! */
ASSERT((ULONG_PTR)SecureObjectInformation ^ (ULONG_PTR)ObjectName != 0);
if(ObjectAttributes == NULL)
{
failbasiccleanup:
if(ObjectName != NULL)
{
RtlInitUnicodeString(ObjectName, NULL);
}
if(CapturedObjectAttributes != NULL)
{
RtlZeroMemory(CapturedObjectAttributes, sizeof(CAPTURED_OBJECT_ATTRIBUTES));
}
return Status; /* STATUS_SUCCESS */
}
if(AccessMode != KernelMode)
{
_SEH_TRY
{
ProbeForRead(ObjectAttributes,
sizeof(ObjectAttributes),
sizeof(ULONG));
/* make a copy on the stack */
AttributesCopy = *ObjectAttributes;
}
_SEH_HANDLE
{
Status = _SEH_GetExceptionCode();
}
_SEH_END;
if(!NT_SUCCESS(Status))
{
return Status;
}
}
else if(AccessMode == KernelMode && !CaptureIfKernel)
{
if(AttributesCopy.Length != sizeof(OBJECT_ATTRIBUTES))
{
if(ObjectName != NULL)
{
*ObjectName = *ObjectAttributes->ObjectName;
}
if(CapturedObjectAttributes != NULL)
{
CapturedObjectAttributes->RootDirectory = ObjectAttributes->RootDirectory;
CapturedObjectAttributes->Attributes = ObjectAttributes->Attributes;
CapturedObjectAttributes->SecurityDescriptor = ObjectAttributes->SecurityDescriptor;
}
}
else
{
Status = STATUS_INVALID_PARAMETER;
goto failbasiccleanup;
}
return STATUS_SUCCESS;
}
else
{
AttributesCopy = *ObjectAttributes;
}
/* if Length isn't as expected, bail with an invalid parameter status code so
the caller knows he passed garbage... */
if(AttributesCopy.Length != sizeof(OBJECT_ATTRIBUTES))
{
Status = STATUS_INVALID_PARAMETER;
goto failbasiccleanup;
}
if(CapturedObjectAttributes != NULL)
{
CapturedObjectAttributes->RootDirectory = AttributesCopy.RootDirectory;
CapturedObjectAttributes->Attributes = AttributesCopy.Attributes;
if(AttributesCopy.SecurityDescriptor != NULL)
{
Status = SeCaptureSecurityDescriptor(AttributesCopy.SecurityDescriptor,
AccessMode,
PagedPool,
TRUE,
&CapturedObjectAttributes->SecurityDescriptor);
if(!NT_SUCCESS(Status))
{
DPRINT1("Unable to capture the security descriptor!!!\n");
goto failbasiccleanup;
}
}
else
{
CapturedObjectAttributes->SecurityDescriptor = NULL;
}
}
if(ObjectName != NULL)
{
if(AttributesCopy.ObjectName != NULL)
{
UNICODE_STRING OriginalCopy;
if(AccessMode != KernelMode)
{
_SEH_TRY
{
/* probe the ObjectName structure and make a local stack copy of it */
ProbeForRead(AttributesCopy.ObjectName,
sizeof(UNICODE_STRING),
sizeof(ULONG));
OriginalCopy = *AttributesCopy.ObjectName;
if(OriginalCopy.Length > 0)
{
ProbeForRead(OriginalCopy.Buffer,
OriginalCopy.Length,
sizeof(ULONG));
}
}
_SEH_HANDLE
{
Status = _SEH_GetExceptionCode();
}
_SEH_END;
if(OriginalCopy.Length > 0)
{
ObjectName->MaximumLength = OriginalCopy.Length + sizeof(WCHAR);
ObjectName->Buffer = ExAllocatePool(NonPagedPool,
ObjectName->MaximumLength);
if(ObjectName->Buffer != NULL)
{
_SEH_TRY
{
/* no need to probe OriginalCopy.Buffer again, we already did that
when capturing the UNICODE_STRING structure itself */
RtlCopyMemory(ObjectName->Buffer, OriginalCopy.Buffer, OriginalCopy.Length);
ObjectName->Buffer[OriginalCopy.Length / sizeof(WCHAR)] = L'\0';
}
_SEH_HANDLE
{
Status = _SEH_GetExceptionCode();
}
_SEH_END;
}
else
{
Status = STATUS_INSUFFICIENT_RESOURCES;
}
}
else if(AttributesCopy.RootDirectory != NULL /* && OriginalCopy.Length == 0 */)
{
/* if the caller specified a root directory, there must be an object name! */
Status = STATUS_OBJECT_NAME_INVALID;
}
if(!NT_SUCCESS(Status))
{
failallocatedcleanup:
if(ObjectName->Buffer)
{
ExFreePool(ObjectName->Buffer);
}
if(CapturedObjectAttributes != NULL)
{
/* cleanup allocated resources */
SeReleaseSecurityDescriptor(CapturedObjectAttributes->SecurityDescriptor,
AccessMode,
TRUE);
}
goto failbasiccleanup;
}
}
else /* AccessMode == KernelMode */
{
OriginalCopy = *AttributesCopy.ObjectName;
if(OriginalCopy.Length > 0)
{
ObjectName->MaximumLength = OriginalCopy.Length + sizeof(WCHAR);
ObjectName->Buffer = ExAllocatePool(NonPagedPool,
ObjectName->MaximumLength);
if(ObjectName->Buffer != NULL)
{
RtlCopyMemory(ObjectName->Buffer, OriginalCopy.Buffer, OriginalCopy.Length);
ObjectName->Buffer[OriginalCopy.Length / sizeof(WCHAR)] = L'\0';
}
else
{
Status = STATUS_INSUFFICIENT_RESOURCES;
}
}
else if(AttributesCopy.RootDirectory != NULL /* && OriginalCopy.Length == 0 */)
{
/* if the caller specified a root directory, there must be an object name! */
Status = STATUS_OBJECT_NAME_INVALID;
}
if(!NT_SUCCESS(Status))
{
goto failallocatedcleanup;
}
}
}
else
{
RtlInitUnicodeString(ObjectName, NULL);
}
}
return Status;
}
VOID
ObpReleaseObjectAttributes(IN PCAPTURED_OBJECT_ATTRIBUTES CapturedObjectAttributes OPTIONAL,
IN PUNICODE_STRING ObjectName OPTIONAL,
IN KPROCESSOR_MODE AccessMode,
IN BOOLEAN CaptureIfKernel)
{
/* WARNING - You need to pass the same parameters to this function as you passed
to ObpCaptureObjectAttributes() to avoid memory leaks */
if(AccessMode != KernelMode ||
(AccessMode == KernelMode && CaptureIfKernel))
{
if(CapturedObjectAttributes != NULL &&
CapturedObjectAttributes->SecurityDescriptor != NULL)
{
ExFreePool(CapturedObjectAttributes->SecurityDescriptor);
CapturedObjectAttributes->SecurityDescriptor = NULL;
}
if(ObjectName != NULL &&
ObjectName->Length > 0)
{
ExFreePool(ObjectName->Buffer);
}
}
}
/**********************************************************************
* NAME PRIVATE
@ -344,6 +594,27 @@ ObCreateObject (IN KPROCESSOR_MODE ObjectAttributesAccessMode OPTIONAL,
SECURITY_SUBJECT_CONTEXT SubjectContext;
ASSERT_IRQL(APC_LEVEL);
if(AccessMode == UserMode)
{
Status = STATUS_SUCCESS;
_SEH_TRY
{
ProbeForRead(ObjectAttributes,
sizeof(OBJECT_ATTRIBUTES),
sizeof(ULONG));
}
_SEH_HANDLE
{
Status = _SEH_GetExceptionCode();
}
_SEH_END;
if(!NT_SUCCESS(Status))
{
return Status;
}
}
DPRINT("ObCreateObject(Type %p ObjectAttributes %p, Object %p)\n",
Type, ObjectAttributes, Object);