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audk/MdeModulePkg/Core/Dxe/SectionExtraction/CoreSectionExtraction.c

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/*++
Copyright (c) 2006, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
CoreSectionExtraction.c
Abstract:
Section Extraction Protocol implementation.
Stream database is implemented as a linked list of section streams,
where each stream contains a linked list of children, which may be leaves or
encapsulations.
Children that are encapsulations generate new stream entries
when they are created. Streams can also be created by calls to
SEP->OpenSectionStream().
The database is only created far enough to return the requested data from
any given stream, or to determine that the requested data is not found.
If a GUIDed encapsulation is encountered, there are three possiblilites.
1) A support protocol is found, in which the stream is simply processed with
the support protocol.
2) A support protocol is not found, but the data is available to be read
without processing. In this case, the database is built up through the
recursions to return the data, and a RPN event is set that will enable
the stream in question to be refreshed if and when the required section
extraction protocol is published.This insures the AuthenticationStatus
does not become stale in the cache.
3) A support protocol is not found, and the data is not available to be read
without it. This results in EFI_PROTOCOL_ERROR.
--*/
#include <DxeMain.h>
//
// Local defines and typedefs
//
#define CORE_SECTION_CHILD_SIGNATURE EFI_SIGNATURE_32('S','X','C','S')
#define CHILD_SECTION_NODE_FROM_LINK(Node) \
CR (Node, CORE_SECTION_CHILD_NODE, Link, CORE_SECTION_CHILD_SIGNATURE)
typedef struct {
UINT32 Signature;
LIST_ENTRY Link;
UINT32 Type;
UINT32 Size;
//
// StreamBase + OffsetInStream == pointer to section header in stream. The
// stream base is always known when walking the sections within.
//
UINT32 OffsetInStream;
//
// Then EncapsulatedStreamHandle below is always 0 if the section is NOT an
// encapsulating section. Otherwise, it contains the stream handle
// of the encapsulated stream. This handle is ALWAYS produced any time an
// encapsulating child is encountered, irrespective of whether the
// encapsulated stream is processed further.
//
UINTN EncapsulatedStreamHandle;
EFI_GUID *EncapsulationGuid;
} CORE_SECTION_CHILD_NODE;
#define CORE_SECTION_STREAM_SIGNATURE EFI_SIGNATURE_32('S','X','S','S')
#define STREAM_NODE_FROM_LINK(Node) \
CR (Node, CORE_SECTION_STREAM_NODE, Link, CORE_SECTION_STREAM_SIGNATURE)
typedef struct {
UINT32 Signature;
LIST_ENTRY Link;
UINTN StreamHandle;
UINT8 *StreamBuffer;
UINTN StreamLength;
LIST_ENTRY Children;
//
// Authentication status is from GUIDed encapsulations.
//
UINT32 AuthenticationStatus;
} CORE_SECTION_STREAM_NODE;
#define NULL_STREAM_HANDLE 0
typedef struct {
CORE_SECTION_CHILD_NODE *ChildNode;
CORE_SECTION_STREAM_NODE *ParentStream;
VOID *Registration;
EFI_EVENT Event;
} RPN_EVENT_CONTEXT;
//
// Local prototypes
//
STATIC
BOOLEAN
ChildIsType (
IN CORE_SECTION_STREAM_NODE *Stream,
IN CORE_SECTION_CHILD_NODE *Child,
IN EFI_SECTION_TYPE SearchType,
IN EFI_GUID *SectionDefinitionGuid
);
STATIC
VOID
EFIAPI
NotifyGuidedExtraction (
IN EFI_EVENT Event,
IN VOID *RpnContext
);
STATIC
VOID
CreateGuidedExtractionRpnEvent (
IN CORE_SECTION_STREAM_NODE *ParentStream,
IN CORE_SECTION_CHILD_NODE *ChildNode
);
STATIC
EFI_STATUS
EFIAPI
OpenSectionStream (
IN EFI_SECTION_EXTRACTION_PROTOCOL *This,
IN UINTN SectionStreamLength,
IN VOID *SectionStream,
OUT UINTN *SectionStreamHandle
);
STATIC
EFI_STATUS
EFIAPI
GetSection (
IN EFI_SECTION_EXTRACTION_PROTOCOL *This,
IN UINTN SectionStreamHandle,
IN EFI_SECTION_TYPE *SectionType,
IN EFI_GUID *SectionDefinitionGuid,
IN UINTN SectionInstance,
IN VOID **Buffer,
IN OUT UINTN *BufferSize,
OUT UINT32 *AuthenticationStatus
);
STATIC
EFI_STATUS
EFIAPI
CloseSectionStream (
IN EFI_SECTION_EXTRACTION_PROTOCOL *This,
IN UINTN StreamHandleToClose
);
STATIC
EFI_STATUS
FindStreamNode (
IN UINTN SearchHandle,
OUT CORE_SECTION_STREAM_NODE **FoundStream
);
STATIC
EFI_STATUS
FindChildNode (
IN CORE_SECTION_STREAM_NODE *SourceStream,
IN EFI_SECTION_TYPE SearchType,
IN UINTN *SectionInstance,
IN EFI_GUID *SectionDefinitionGuid,
OUT CORE_SECTION_CHILD_NODE **FoundChild,
OUT CORE_SECTION_STREAM_NODE **FoundStream,
OUT UINT32 *AuthenticationStatus
);
STATIC
EFI_STATUS
CreateChildNode (
IN CORE_SECTION_STREAM_NODE *Stream,
IN UINT32 ChildOffset,
OUT CORE_SECTION_CHILD_NODE **ChildNode
);
STATIC
VOID
FreeChildNode (
IN CORE_SECTION_CHILD_NODE *ChildNode
);
STATIC
EFI_STATUS
OpenSectionStreamEx (
IN UINTN SectionStreamLength,
IN VOID *SectionStream,
IN BOOLEAN AllocateBuffer,
IN UINT32 AuthenticationStatus,
OUT UINTN *SectionStreamHandle
);
STATIC
BOOLEAN
IsValidSectionStream (
IN VOID *SectionStream,
IN UINTN SectionStreamLength
);
EFI_STATUS
CustomDecompressExtractSection (
IN CONST EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL *This,
IN CONST VOID *InputSection,
OUT VOID **OutputBuffer,
OUT UINTN *OutputSize,
OUT UINT32 *AuthenticationStatus
);
//
// Module globals
//
LIST_ENTRY mStreamRoot = INITIALIZE_LIST_HEAD_VARIABLE (mStreamRoot);
EFI_HANDLE mSectionExtractionHandle = NULL;
EFI_SECTION_EXTRACTION_PROTOCOL mSectionExtraction = {
OpenSectionStream,
GetSection,
CloseSectionStream
};
EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL mCustomDecompressExtraction = {
CustomDecompressExtractSection
};
EFI_STATUS
EFIAPI
InitializeSectionExtraction (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
/*++
Routine Description:
Entry point of the section extraction code. Initializes an instance of the
section extraction interface and installs it on a new handle.
Arguments:
ImageHandle EFI_HANDLE: A handle for the image that is initializing this driver
SystemTable EFI_SYSTEM_TABLE: A pointer to the EFI system table
Returns:
EFI_SUCCESS: Driver initialized successfully
EFI_OUT_OF_RESOURCES: Could not allocate needed resources
--*/
{
EFI_STATUS Status;
EFI_GUID **DecompressGuidList;
UINT32 DecompressMethodNumber;
//
// Install SEP to a new handle
//
Status = CoreInstallProtocolInterface (
&mSectionExtractionHandle,
&gEfiSectionExtractionProtocolGuid,
EFI_NATIVE_INTERFACE,
&mSectionExtraction
);
ASSERT_EFI_ERROR (Status);
//
// Get custom decompress method guid list
//
DecompressGuidList = NULL;
DecompressMethodNumber = 0;
Status = CustomDecompressGetAlgorithms (DecompressGuidList, &DecompressMethodNumber);
if (Status == EFI_OUT_OF_RESOURCES) {
DecompressGuidList = (EFI_GUID **) CoreAllocateBootServicesPool (DecompressMethodNumber * sizeof (EFI_GUID *));
ASSERT (DecompressGuidList != NULL);
Status = CustomDecompressGetAlgorithms (DecompressGuidList, &DecompressMethodNumber);
}
ASSERT_EFI_ERROR(Status);
//
// Install custom decompress guided extraction protocol
//
while (DecompressMethodNumber-- > 0) {
Status = CoreInstallProtocolInterface (
&mSectionExtractionHandle,
DecompressGuidList [DecompressMethodNumber],
EFI_NATIVE_INTERFACE,
&mCustomDecompressExtraction
);
ASSERT_EFI_ERROR (Status);
}
CoreFreePool (DecompressGuidList);
return Status;
}
STATIC
EFI_STATUS
EFIAPI
OpenSectionStream (
IN EFI_SECTION_EXTRACTION_PROTOCOL *This,
IN UINTN SectionStreamLength,
IN VOID *SectionStream,
OUT UINTN *SectionStreamHandle
)
/*++
Routine Description:
SEP member function. This function creates and returns a new section stream
handle to represent the new section stream.
Arguments:
This - Indicates the calling context.
SectionStreamLength - Size in bytes of the section stream.
SectionStream - Buffer containing the new section stream.
SectionStreamHandle - A pointer to a caller allocated UINTN that on output
contains the new section stream handle.
Returns:
EFI_SUCCESS
EFI_OUT_OF_RESOURCES - memory allocation failed.
EFI_INVALID_PARAMETER - section stream does not end concident with end of
last section.
--*/
{
//
// Check to see section stream looks good...
//
if (!IsValidSectionStream (SectionStream, SectionStreamLength)) {
return EFI_INVALID_PARAMETER;
}
return OpenSectionStreamEx (
SectionStreamLength,
SectionStream,
TRUE,
0,
SectionStreamHandle
);
}
STATIC
EFI_STATUS
EFIAPI
GetSection (
IN EFI_SECTION_EXTRACTION_PROTOCOL *This,
IN UINTN SectionStreamHandle,
IN EFI_SECTION_TYPE *SectionType,
IN EFI_GUID *SectionDefinitionGuid,
IN UINTN SectionInstance,
IN VOID **Buffer,
IN OUT UINTN *BufferSize,
OUT UINT32 *AuthenticationStatus
)
/*++
Routine Description:
SEP member function. Retrieves requested section from section stream.
Arguments:
This: Pointer to SEP instance.
SectionStreamHandle: The section stream from which to extract the requested
section.
SectionType: A pointer to the type of section to search for.
SectionDefinitionGuid: If the section type is EFI_SECTION_GUID_DEFINED, then
SectionDefinitionGuid indicates which of these types
of sections to search for.
SectionInstance: Indicates which instance of the requested section to
return.
Buffer: Double indirection to buffer. If *Buffer is non-null on
input, then the buffer is caller allocated. If
*Buffer is NULL, then the buffer is callee allocated.
In either case, the requried buffer size is returned
in *BufferSize.
BufferSize: On input, indicates the size of *Buffer if *Buffer is
non-null on input. On output, indicates the required
size (allocated size if callee allocated) of *Buffer.
AuthenticationStatus: Indicates the authentication status of the retrieved
section.
Returns:
EFI_SUCCESS: Section was retrieved successfully
EFI_PROTOCOL_ERROR: A GUID defined section was encountered in the section
stream with its EFI_GUIDED_SECTION_PROCESSING_REQUIRED
bit set, but there was no corresponding GUIDed Section
Extraction Protocol in the handle database. *Buffer is
unmodified.
EFI_NOT_FOUND: An error was encountered when parsing the SectionStream.
This indicates the SectionStream is not correctly
formatted.
EFI_NOT_FOUND: The requested section does not exist.
EFI_OUT_OF_RESOURCES: The system has insufficient resources to process the
request.
EFI_INVALID_PARAMETER: The SectionStreamHandle does not exist.
EFI_WARN_TOO_SMALL: The size of the caller allocated input buffer is
insufficient to contain the requested section. The
input buffer is filled and contents are section contents
are truncated.
--*/
{
CORE_SECTION_STREAM_NODE *StreamNode;
EFI_TPL OldTpl;
EFI_STATUS Status;
CORE_SECTION_CHILD_NODE *ChildNode;
CORE_SECTION_STREAM_NODE *ChildStreamNode;
UINTN CopySize;
UINT32 ExtractedAuthenticationStatus;
UINTN Instance;
UINT8 *CopyBuffer;
UINTN SectionSize;
OldTpl = CoreRaiseTpl (TPL_NOTIFY);
Instance = SectionInstance + 1;
//
// Locate target stream
//
Status = FindStreamNode (SectionStreamHandle, &StreamNode);
if (EFI_ERROR (Status)) {
Status = EFI_INVALID_PARAMETER;
goto GetSection_Done;
}
//
// Found the stream, now locate and return the appropriate section
//
if (SectionType == NULL) {
//
// SectionType == NULL means return the WHOLE section stream...
//
CopySize = StreamNode->StreamLength;
CopyBuffer = StreamNode->StreamBuffer;
*AuthenticationStatus = StreamNode->AuthenticationStatus;
} else {
//
// There's a requested section type, so go find it and return it...
//
Status = FindChildNode (
StreamNode,
*SectionType,
&Instance,
SectionDefinitionGuid,
&ChildNode,
&ChildStreamNode,
&ExtractedAuthenticationStatus
);
if (EFI_ERROR (Status)) {
goto GetSection_Done;
}
CopySize = ChildNode->Size - sizeof (EFI_COMMON_SECTION_HEADER);
CopyBuffer = ChildStreamNode->StreamBuffer + ChildNode->OffsetInStream + sizeof (EFI_COMMON_SECTION_HEADER);
*AuthenticationStatus = ExtractedAuthenticationStatus;
}
SectionSize = CopySize;
if (*Buffer != NULL) {
//
// Caller allocated buffer. Fill to size and return required size...
//
if (*BufferSize < CopySize) {
Status = EFI_WARN_BUFFER_TOO_SMALL;
CopySize = *BufferSize;
}
} else {
//
// Callee allocated buffer. Allocate buffer and return size.
//
*Buffer = CoreAllocateBootServicesPool (CopySize);
if (*Buffer == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto GetSection_Done;
}
}
CopyMem (*Buffer, CopyBuffer, CopySize);
*BufferSize = SectionSize;
GetSection_Done:
CoreRestoreTpl (OldTpl);
return Status;
}
STATIC
EFI_STATUS
EFIAPI
CloseSectionStream (
IN EFI_SECTION_EXTRACTION_PROTOCOL *This,
IN UINTN StreamHandleToClose
)
/*++
Routine Description:
SEP member function. Deletes an existing section stream
Arguments:
This - Indicates the calling context.
StreamHandleToClose - Indicates the stream to close
Returns:
EFI_SUCCESS
EFI_OUT_OF_RESOURCES - memory allocation failed.
EFI_INVALID_PARAMETER - section stream does not end concident with end of
last section.
--*/
{
CORE_SECTION_STREAM_NODE *StreamNode;
EFI_TPL OldTpl;
EFI_STATUS Status;
LIST_ENTRY *Link;
CORE_SECTION_CHILD_NODE *ChildNode;
OldTpl = CoreRaiseTpl (TPL_NOTIFY);
//
// Locate target stream
//
Status = FindStreamNode (StreamHandleToClose, &StreamNode);
if (!EFI_ERROR (Status)) {
//
// Found the stream, so close it
//
RemoveEntryList (&StreamNode->Link);
while (!IsListEmpty (&StreamNode->Children)) {
Link = GetFirstNode (&StreamNode->Children);
ChildNode = CHILD_SECTION_NODE_FROM_LINK (Link);
FreeChildNode (ChildNode);
}
CoreFreePool (StreamNode->StreamBuffer);
CoreFreePool (StreamNode);
Status = EFI_SUCCESS;
} else {
Status = EFI_INVALID_PARAMETER;
}
CoreRestoreTpl (OldTpl);
return Status;
}
STATIC
BOOLEAN
ChildIsType (
IN CORE_SECTION_STREAM_NODE *Stream,
IN CORE_SECTION_CHILD_NODE *Child,
IN EFI_SECTION_TYPE SearchType,
IN EFI_GUID *SectionDefinitionGuid
)
/*++
Routine Description:
Worker function. Determine if the input stream:child matches the input type.
Arguments:
Stream - Indicates the section stream associated with the child
Child - Indicates the child to check
SearchType - Indicates the type of section to check against for
SectionDefinitionGuid - Indicates the GUID to check against if the type is
EFI_SECTION_GUID_DEFINED
Returns:
TRUE - The child matches
FALSE - The child doesn't match
--*/
{
EFI_GUID_DEFINED_SECTION *GuidedSection;
if (SearchType == EFI_SECTION_ALL) {
return TRUE;
}
if (Child->Type != SearchType) {
return FALSE;
}
if (SearchType != EFI_SECTION_GUID_DEFINED) {
return TRUE;
}
GuidedSection = (EFI_GUID_DEFINED_SECTION * )(Stream->StreamBuffer + Child->OffsetInStream);
return CompareGuid (&GuidedSection->SectionDefinitionGuid, SectionDefinitionGuid);
}
STATIC
EFI_STATUS
FindChildNode (
IN CORE_SECTION_STREAM_NODE *SourceStream,
IN EFI_SECTION_TYPE SearchType,
IN OUT UINTN *SectionInstance,
IN EFI_GUID *SectionDefinitionGuid,
OUT CORE_SECTION_CHILD_NODE **FoundChild,
OUT CORE_SECTION_STREAM_NODE **FoundStream,
OUT UINT32 *AuthenticationStatus
)
/*++
Routine Description:
Worker function Recursively searches / builds section stream database
looking for requested section.
Arguments:
SourceStream - Indicates the section stream in which to do the search.
SearchType - Indicates the type of section to search for.
SectionInstance - Indicates which instance of section to find. This is
an in/out parameter to deal with recursions.
SectionDefinitionGuid - Guid of section definition
FoundChild - Output indicating the child node that is found.
FoundStream - Output indicating which section stream the child was
found in. If this stream was generated as a result of
an encapsulation section, the streamhandle is visible
within the SEP driver only.
AuthenticationStatus- Indicates the authentication status of the found section.
Returns:
EFI_SUCCESS - Child node was found and returned.
EFI_OUT_OF_RESOURCES- Memory allocation failed.
EFI_NOT_FOUND - Requested child node does not exist.
EFI_PROTOCOL_ERROR - a required GUIDED section extraction protocol does not
exist
--*/
{
CORE_SECTION_CHILD_NODE *CurrentChildNode;
CORE_SECTION_CHILD_NODE *RecursedChildNode;
CORE_SECTION_STREAM_NODE *RecursedFoundStream;
UINT32 NextChildOffset;
EFI_STATUS ErrorStatus;
EFI_STATUS Status;
CurrentChildNode = NULL;
ErrorStatus = EFI_NOT_FOUND;
if (SourceStream->StreamLength == 0) {
return EFI_NOT_FOUND;
}
if (IsListEmpty (&SourceStream->Children) &&
SourceStream->StreamLength > sizeof (EFI_COMMON_SECTION_HEADER)) {
//
// This occurs when a section stream exists, but no child sections
// have been parsed out yet. Therefore, extract the first child and add it
// to the list of children so we can get started.
//
Status = CreateChildNode (SourceStream, 0, &CurrentChildNode);
if (EFI_ERROR (Status)) {
return Status;
}
}
//
// At least one child has been parsed out of the section stream. So, walk
// through the sections that have already been parsed out looking for the
// requested section, if necessary, continue parsing section stream and
// adding children until either the requested section is found, or we run
// out of data
//
CurrentChildNode = CHILD_SECTION_NODE_FROM_LINK (GetFirstNode(&SourceStream->Children));
for (;;) {
if (ChildIsType (SourceStream, CurrentChildNode, SearchType, SectionDefinitionGuid)) {
//
// The type matches, so check the instance count to see if it's the one we want
//
(*SectionInstance)--;
if (*SectionInstance == 0) {
//
// Got it!
//
*FoundChild = CurrentChildNode;
*FoundStream = SourceStream;
*AuthenticationStatus = SourceStream->AuthenticationStatus;
return EFI_SUCCESS;
}
}
if (CurrentChildNode->EncapsulatedStreamHandle != NULL_STREAM_HANDLE) {
//
// If the current node is an encapsulating node, recurse into it...
//
Status = FindChildNode (
(CORE_SECTION_STREAM_NODE *)CurrentChildNode->EncapsulatedStreamHandle,
SearchType,
SectionInstance,
SectionDefinitionGuid,
&RecursedChildNode,
&RecursedFoundStream,
AuthenticationStatus
);
//
// If the status is not EFI_SUCCESS, just save the error code and continue
// to find the request child node in the rest stream.
//
if (*SectionInstance == 0) {
ASSERT_EFI_ERROR (Status);
*FoundChild = RecursedChildNode;
*FoundStream = RecursedFoundStream;
return EFI_SUCCESS;
} else {
ErrorStatus = Status;
}
}
if (!IsNodeAtEnd (&SourceStream->Children, &CurrentChildNode->Link)) {
//
// We haven't found the child node we're interested in yet, but there's
// still more nodes that have already been parsed so get the next one
// and continue searching..
//
CurrentChildNode = CHILD_SECTION_NODE_FROM_LINK (GetNextNode (&SourceStream->Children, &CurrentChildNode->Link));
} else {
//
// We've exhausted children that have already been parsed, so see if
// there's any more data and continue parsing out more children if there
// is.
//
NextChildOffset = CurrentChildNode->OffsetInStream + CurrentChildNode->Size;
//
// Round up to 4 byte boundary
//
NextChildOffset += 3;
NextChildOffset &= ~(UINTN)3;
if (NextChildOffset <= SourceStream->StreamLength - sizeof (EFI_COMMON_SECTION_HEADER)) {
//
// There's an unparsed child remaining in the stream, so create a new child node
//
Status = CreateChildNode (SourceStream, NextChildOffset, &CurrentChildNode);
if (EFI_ERROR (Status)) {
return Status;
}
} else {
ASSERT (EFI_ERROR (ErrorStatus));
return ErrorStatus;
}
}
}
}
STATIC
EFI_STATUS
CreateChildNode (
IN CORE_SECTION_STREAM_NODE *Stream,
IN UINT32 ChildOffset,
OUT CORE_SECTION_CHILD_NODE **ChildNode
)
/*++
Routine Description:
Worker function. Constructor for new child nodes.
Arguments:
Stream - Indicates the section stream in which to add the child.
ChildOffset - Indicates the offset in Stream that is the beginning
of the child section.
ChildNode - Indicates the Callee allocated and initialized child.
Returns:
EFI_SUCCESS - Child node was found and returned.
EFI_OUT_OF_RESOURCES- Memory allocation failed.
EFI_PROTOCOL_ERROR - Encapsulation sections produce new stream handles when
the child node is created. If the section type is GUID
defined, and the extraction GUID does not exist, and
producing the stream requires the GUID, then a protocol
error is generated and no child is produced.
Values returned by OpenSectionStreamEx.
--*/
{
EFI_STATUS Status;
EFI_COMMON_SECTION_HEADER *SectionHeader;
EFI_COMPRESSION_SECTION *CompressionHeader;
EFI_GUID_DEFINED_SECTION *GuidedHeader;
EFI_DECOMPRESS_PROTOCOL *Decompress;
EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL *GuidedExtraction;
VOID *NewStreamBuffer;
VOID *ScratchBuffer;
UINT32 ScratchSize;
UINTN NewStreamBufferSize;
UINT32 AuthenticationStatus;
UINT32 SectionLength;
CORE_SECTION_CHILD_NODE *Node;
SectionHeader = (EFI_COMMON_SECTION_HEADER *) (Stream->StreamBuffer + ChildOffset);
//
// Allocate a new node
//
*ChildNode = CoreAllocateBootServicesPool (sizeof (CORE_SECTION_CHILD_NODE));
Node = *ChildNode;
if (Node == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Now initialize it
//
Node->Signature = CORE_SECTION_CHILD_SIGNATURE;
Node->Type = SectionHeader->Type;
Node->Size = SECTION_SIZE (SectionHeader);
Node->OffsetInStream = ChildOffset;
Node->EncapsulatedStreamHandle = NULL_STREAM_HANDLE;
Node->EncapsulationGuid = NULL;
//
// If it's an encapsulating section, then create the new section stream also
//
switch (Node->Type) {
case EFI_SECTION_COMPRESSION:
//
// Get the CompressionSectionHeader
//
ASSERT (Node->Size >= sizeof (EFI_COMPRESSION_SECTION));
CompressionHeader = (EFI_COMPRESSION_SECTION *) SectionHeader;
//
// Allocate space for the new stream
//
if (CompressionHeader->UncompressedLength > 0) {
NewStreamBufferSize = CompressionHeader->UncompressedLength;
NewStreamBuffer = CoreAllocateBootServicesPool (NewStreamBufferSize);
if (NewStreamBuffer == NULL) {
CoreFreePool (Node);
return EFI_OUT_OF_RESOURCES;
}
if (CompressionHeader->CompressionType == EFI_NOT_COMPRESSED) {
//
// stream is not actually compressed, just encapsulated. So just copy it.
//
CopyMem (NewStreamBuffer, CompressionHeader + 1, NewStreamBufferSize);
} else if (CompressionHeader->CompressionType == EFI_STANDARD_COMPRESSION) {
//
// Only support the EFI_SATNDARD_COMPRESSION algorithm.
//
//
// Decompress the stream
//
Status = CoreLocateProtocol (&gEfiDecompressProtocolGuid, NULL, (VOID **)&Decompress);
ASSERT_EFI_ERROR (Status);
Status = Decompress->GetInfo (
Decompress,
CompressionHeader + 1,
Node->Size - sizeof (EFI_COMPRESSION_SECTION),
(UINT32 *)&NewStreamBufferSize,
&ScratchSize
);
ASSERT_EFI_ERROR (Status);
ASSERT (NewStreamBufferSize == CompressionHeader->UncompressedLength);
ScratchBuffer = CoreAllocateBootServicesPool (ScratchSize);
if (ScratchBuffer == NULL) {
CoreFreePool (Node);
CoreFreePool (NewStreamBuffer);
return EFI_OUT_OF_RESOURCES;
}
Status = Decompress->Decompress (
Decompress,
CompressionHeader + 1,
Node->Size - sizeof (EFI_COMPRESSION_SECTION),
NewStreamBuffer,
(UINT32)NewStreamBufferSize,
ScratchBuffer,
ScratchSize
);
ASSERT_EFI_ERROR (Status);
CoreFreePool (ScratchBuffer);
}
} else {
NewStreamBuffer = NULL;
NewStreamBufferSize = 0;
}
Status = OpenSectionStreamEx (
NewStreamBufferSize,
NewStreamBuffer,
FALSE,
Stream->AuthenticationStatus,
&Node->EncapsulatedStreamHandle
);
if (EFI_ERROR (Status)) {
CoreFreePool (Node);
CoreFreePool (NewStreamBuffer);
return Status;
}
break;
case EFI_SECTION_GUID_DEFINED:
GuidedHeader = (EFI_GUID_DEFINED_SECTION *) SectionHeader;
Node->EncapsulationGuid = &GuidedHeader->SectionDefinitionGuid;
Status = CoreLocateProtocol (Node->EncapsulationGuid, NULL, (VOID **)&GuidedExtraction);
if (!EFI_ERROR (Status)) {
//
// NewStreamBuffer is always allocated by ExtractSection... No caller
// allocation here.
//
Status = GuidedExtraction->ExtractSection (
GuidedExtraction,
GuidedHeader,
&NewStreamBuffer,
&NewStreamBufferSize,
&AuthenticationStatus
);
if (EFI_ERROR (Status)) {
CoreFreePool (*ChildNode);
return EFI_PROTOCOL_ERROR;
}
//
// Make sure we initialize the new stream with the correct
// authentication status for both aggregate and local status fields.
//
if (GuidedHeader->Attributes & EFI_GUIDED_SECTION_AUTH_STATUS_VALID) {
//
// OR in the parent stream's aggregate status.
//
AuthenticationStatus |= Stream->AuthenticationStatus & EFI_AGGREGATE_AUTH_STATUS_ALL;
} else {
//
// since there's no authentication data contributed by the section,
// just inherit the full value from our immediate parent.
//
AuthenticationStatus = Stream->AuthenticationStatus;
}
Status = OpenSectionStreamEx (
NewStreamBufferSize,
NewStreamBuffer,
FALSE,
AuthenticationStatus,
&Node->EncapsulatedStreamHandle
);
if (EFI_ERROR (Status)) {
CoreFreePool (*ChildNode);
CoreFreePool (NewStreamBuffer);
return Status;
}
} else {
//
// There's no GUIDed section extraction protocol available.
//
if (GuidedHeader->Attributes & EFI_GUIDED_SECTION_PROCESSING_REQUIRED) {
//
// If the section REQUIRES an extraction protocol, then we're toast
//
CoreFreePool (*ChildNode);
return EFI_PROTOCOL_ERROR;
}
//
// Figure out the proper authentication status
//
AuthenticationStatus = Stream->AuthenticationStatus;
if (GuidedHeader->Attributes & EFI_GUIDED_SECTION_AUTH_STATUS_VALID) {
//
// The local status of the new stream is contained in
// AuthenticaionStatus. This value needs to be ORed into the
// Aggregate bits also...
//
//
// Clear out and initialize the local status
//
AuthenticationStatus &= ~EFI_LOCAL_AUTH_STATUS_ALL;
AuthenticationStatus |= EFI_LOCAL_AUTH_STATUS_IMAGE_SIGNED | EFI_LOCAL_AUTH_STATUS_NOT_TESTED;
//
// OR local status into aggregate status
//
AuthenticationStatus |= AuthenticationStatus >> 16;
}
SectionLength = SECTION_SIZE (GuidedHeader);
Status = OpenSectionStreamEx (
SectionLength - GuidedHeader->DataOffset,
(UINT8 *) GuidedHeader + GuidedHeader->DataOffset,
TRUE,
AuthenticationStatus,
&Node->EncapsulatedStreamHandle
);
if (EFI_ERROR (Status)) {
CoreFreePool (Node);
return Status;
}
}
if ((AuthenticationStatus & EFI_LOCAL_AUTH_STATUS_ALL) ==
(EFI_LOCAL_AUTH_STATUS_IMAGE_SIGNED | EFI_LOCAL_AUTH_STATUS_NOT_TESTED)) {
//
// Need to register for RPN for when the required GUIDed extraction
// protocol becomes available. This will enable us to refresh the
// AuthenticationStatus cached in the Stream if it's ever requested
// again.
//
CreateGuidedExtractionRpnEvent (Stream, Node);
}
break;
default:
//
// Nothing to do if it's a leaf
//
break;
}
//
// Last, add the new child node to the stream
//
InsertTailList (&Stream->Children, &Node->Link);
return EFI_SUCCESS;
}
STATIC
VOID
CreateGuidedExtractionRpnEvent (
IN CORE_SECTION_STREAM_NODE *ParentStream,
IN CORE_SECTION_CHILD_NODE *ChildNode
)
/*++
Routine Description:
Worker function. Constructor for RPN event if needed to keep AuthenticationStatus
cache correct when a missing GUIDED_SECTION_EXTRACTION_PROTOCOL appears...
Arguments:
ParentStream - Indicates the parent of the ecnapsulation section (child)
ChildNode - Indicates the child node that is the encapsulation section.
Returns:
None
--*/
{
RPN_EVENT_CONTEXT *Context;
//
// Allocate new event structure and context
//
Context = CoreAllocateBootServicesPool (sizeof (RPN_EVENT_CONTEXT));
ASSERT (Context != NULL);
Context->ChildNode = ChildNode;
Context->ParentStream = ParentStream;
Context->Event = CoreCreateProtocolNotifyEvent (
Context->ChildNode->EncapsulationGuid,
TPL_NOTIFY,
NotifyGuidedExtraction,
Context,
&Context->Registration,
FALSE
);
}
STATIC
VOID
EFIAPI
NotifyGuidedExtraction (
IN EFI_EVENT Event,
IN VOID *RpnContext
)
/*++
Routine Description:
RPN callback function. Removes a stale section stream and re-initializes it
with an updated AuthenticationStatus.
Arguments:
Event - The event that fired
RpnContext - A pointer to the context that allows us to identify
the relevent encapsulation...
Returns:
None
--*/
{
EFI_STATUS Status;
EFI_GUID_DEFINED_SECTION *GuidedHeader;
EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL *GuidedExtraction;
VOID *NewStreamBuffer;
UINTN NewStreamBufferSize;
UINT32 AuthenticationStatus;
RPN_EVENT_CONTEXT *Context;
Context = RpnContext;
Status = CloseSectionStream (&mSectionExtraction, Context->ChildNode->EncapsulatedStreamHandle);
if (!EFI_ERROR (Status)) {
//
// The stream closed successfully, so re-open the stream with correct AuthenticationStatus
//
GuidedHeader = (EFI_GUID_DEFINED_SECTION *)
(Context->ParentStream->StreamBuffer + Context->ChildNode->OffsetInStream);
ASSERT (GuidedHeader->CommonHeader.Type == EFI_SECTION_GUID_DEFINED);
Status = CoreLocateProtocol (Context->ChildNode->EncapsulationGuid, NULL, (VOID **)&GuidedExtraction);
ASSERT_EFI_ERROR (Status);
Status = GuidedExtraction->ExtractSection (
GuidedExtraction,
GuidedHeader,
&NewStreamBuffer,
&NewStreamBufferSize,
&AuthenticationStatus
);
ASSERT_EFI_ERROR (Status);
//
// OR in the parent stream's aggregagate status.
//
AuthenticationStatus |= Context->ParentStream->AuthenticationStatus & EFI_AGGREGATE_AUTH_STATUS_ALL;
Status = OpenSectionStreamEx (
NewStreamBufferSize,
NewStreamBuffer,
FALSE,
AuthenticationStatus,
&Context->ChildNode->EncapsulatedStreamHandle
);
ASSERT_EFI_ERROR (Status);
}
//
// If above, the stream did not close successfully, it indicates it's
// alread been closed by someone, so just destroy the event and be done with
// it.
//
CoreCloseEvent (Event);
CoreFreePool (Context);
}
STATIC
VOID
FreeChildNode (
IN CORE_SECTION_CHILD_NODE *ChildNode
)
/*++
Routine Description:
Worker function. Destructor for child nodes.
Arguments:
ChildNode - Indicates the node to destroy
Returns:
none
--*/
{
ASSERT (ChildNode->Signature == CORE_SECTION_CHILD_SIGNATURE);
//
// Remove the child from it's list
//
RemoveEntryList (&ChildNode->Link);
if (ChildNode->EncapsulatedStreamHandle != NULL_STREAM_HANDLE) {
//
// If it's an encapsulating section, we close the resulting section stream.
// CloseSectionStream will free all memory associated with the stream.
//
CloseSectionStream (&mSectionExtraction, ChildNode->EncapsulatedStreamHandle);
}
//
// Last, free the child node itself
//
CoreFreePool (ChildNode);
}
STATIC
EFI_STATUS
OpenSectionStreamEx (
IN UINTN SectionStreamLength,
IN VOID *SectionStream,
IN BOOLEAN AllocateBuffer,
IN UINT32 AuthenticationStatus,
OUT UINTN *SectionStreamHandle
)
/*++
Routine Description:
Worker function. Constructor for section streams.
Arguments:
SectionStreamLength - Size in bytes of the section stream.
SectionStream - Buffer containing the new section stream.
AllocateBuffer - Indicates whether the stream buffer is to be copied
or the input buffer is to be used in place.
AuthenticationStatus- Indicates the default authentication status for the
new stream.
SectionStreamHandle - A pointer to a caller allocated section stream handle.
Returns:
EFI_SUCCESS - Stream was added to stream database.
EFI_OUT_OF_RESOURCES - memory allocation failed.
--*/
{
CORE_SECTION_STREAM_NODE *NewStream;
EFI_TPL OldTpl;
//
// Allocate a new stream
//
NewStream = CoreAllocateBootServicesPool (sizeof (CORE_SECTION_STREAM_NODE));
if (NewStream == NULL) {
return EFI_OUT_OF_RESOURCES;
}
if (AllocateBuffer) {
//
// if we're here, we're double buffering, allocate the buffer and copy the
// data in
//
if (SectionStreamLength > 0) {
NewStream->StreamBuffer = CoreAllocateBootServicesPool (SectionStreamLength);
if (NewStream->StreamBuffer == NULL) {
CoreFreePool (NewStream);
return EFI_OUT_OF_RESOURCES;
}
//
// Copy in stream data
//
CopyMem (NewStream->StreamBuffer, SectionStream, SectionStreamLength);
} else {
//
// It's possible to have a zero length section stream.
//
NewStream->StreamBuffer = NULL;
}
} else {
//
// If were here, the caller has supplied the buffer (it's an internal call)
// so just assign the buffer. This happens when we open section streams
// as a result of expanding an encapsulating section.
//
NewStream->StreamBuffer = SectionStream;
}
//
// Initialize the rest of the section stream
//
NewStream->Signature = CORE_SECTION_STREAM_SIGNATURE;
NewStream->StreamHandle = (UINTN) NewStream;
NewStream->StreamLength = SectionStreamLength;
InitializeListHead (&NewStream->Children);
NewStream->AuthenticationStatus = AuthenticationStatus;
//
// Add new stream to stream list
//
OldTpl = CoreRaiseTpl (TPL_NOTIFY);
InsertTailList (&mStreamRoot, &NewStream->Link);
CoreRestoreTpl (OldTpl);
*SectionStreamHandle = NewStream->StreamHandle;
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
FindStreamNode (
IN UINTN SearchHandle,
OUT CORE_SECTION_STREAM_NODE **FoundStream
)
/*++
Routine Description:
Worker function. Search stream database for requested stream handle.
Arguments:
SearchHandle - Indicates which stream to look for.
FoundStream - Output pointer to the found stream.
Returns:
EFI_SUCCESS - StreamHandle was found and *FoundStream contains
the stream node.
EFI_NOT_FOUND - SearchHandle was not found in the stream database.
--*/
{
CORE_SECTION_STREAM_NODE *StreamNode;
if (!IsListEmpty (&mStreamRoot)) {
StreamNode = STREAM_NODE_FROM_LINK (GetFirstNode (&mStreamRoot));
for (;;) {
if (StreamNode->StreamHandle == SearchHandle) {
*FoundStream = StreamNode;
return EFI_SUCCESS;
} else if (IsNodeAtEnd (&mStreamRoot, &StreamNode->Link)) {
break;
} else {
StreamNode = STREAM_NODE_FROM_LINK (GetNextNode (&mStreamRoot, &StreamNode->Link));
}
}
}
return EFI_NOT_FOUND;
}
STATIC
BOOLEAN
IsValidSectionStream (
IN VOID *SectionStream,
IN UINTN SectionStreamLength
)
/*++
Routine Description:
Check if a stream is valid.
Arguments:
SectionStream - The section stream to be checked
SectionStreamLength - The length of section stream
Returns:
TRUE
FALSE
--*/
{
UINTN TotalLength;
UINTN SectionLength;
EFI_COMMON_SECTION_HEADER *SectionHeader;
EFI_COMMON_SECTION_HEADER *NextSectionHeader;
TotalLength = 0;
SectionHeader = (EFI_COMMON_SECTION_HEADER *)SectionStream;
while (TotalLength < SectionStreamLength) {
SectionLength = SECTION_SIZE (SectionHeader);
TotalLength += SectionLength;
if (TotalLength == SectionStreamLength) {
return TRUE;
}
//
// Move to the next byte following the section...
//
SectionHeader = (EFI_COMMON_SECTION_HEADER *) ((UINT8 *) SectionHeader + SectionLength);
//
// Figure out where the next section begins
//
NextSectionHeader = (EFI_COMMON_SECTION_HEADER *) ((UINTN) SectionHeader + 3);
NextSectionHeader = (EFI_COMMON_SECTION_HEADER *) ((UINTN) NextSectionHeader & ~(UINTN)3);
TotalLength += (UINTN) NextSectionHeader - (UINTN) SectionHeader;
SectionHeader = NextSectionHeader;
}
ASSERT (FALSE);
return FALSE;
}
/**
The ExtractSection() function processes the input section and
allocates a buffer from the pool in which it returns the section
contents. If the section being extracted contains
authentication information (the section's
GuidedSectionHeader.Attributes field has the
EFI_GUIDED_SECTION_AUTH_STATUS_VALID bit set), the values
returned in AuthenticationStatus must reflect the results of
the authentication operation. Depending on the algorithm and
size of the encapsulated data, the time that is required to do
a full authentication may be prohibitively long for some
classes of systems. To indicate this, use
EFI_SECURITY_POLICY_PROTOCOL_GUID, which may be published by
the security policy driver (see the Platform Initialization
Driver Execution Environment Core Interface Specification for
more details and the GUID definition). If the
EFI_SECURITY_POLICY_PROTOCOL_GUID exists in the handle
database, then, if possible, full authentication should be
skipped and the section contents simply returned in the
OutputBuffer. In this case, the
EFI_AUTH_STATUS_PLATFORM_OVERRIDE bit AuthenticationStatus
must be set on return. ExtractSection() is callable only from
TPL_NOTIFY and below. Behavior of ExtractSection() at any
EFI_TPL above TPL_NOTIFY is undefined. Type EFI_TPL is
defined in RaiseTPL() in the UEFI 2.0 specification.
@param This Indicates the
EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL instance.
@param InputSection Buffer containing the input GUIDed section
to be processed. OutputBuffer OutputBuffer
is allocated from boot services pool
memory and contains the new section
stream. The caller is responsible for
freeing this buffer.
@param OutputSize A pointer to a caller-allocated UINTN in
which the size of OutputBuffer allocation
is stored. If the function returns
anything other than EFI_SUCCESS, the value
of OutputSize is undefined.
@param AuthenticationStatus A pointer to a caller-allocated
UINT32 that indicates the
authentication status of the
output buffer. If the input
section's
GuidedSectionHeader.Attributes
field has the
EFI_GUIDED_SECTION_AUTH_STATUS_VAL
bit as clear, AuthenticationStatus
must return zero. Both local bits
(19:16) and aggregate bits (3:0)
in AuthenticationStatus are
returned by ExtractSection().
These bits reflect the status of
the extraction operation. The bit
pattern in both regions must be
the same, as the local and
aggregate authentication statuses
have equivalent meaning at this
level. If the function returns
anything other than EFI_SUCCESS,
the value of AuthenticationStatus
is undefined.
@retval EFI_SUCCESS The InputSection was successfully
processed and the section contents were
returned.
@retval EFI_OUT_OF_RESOURCES The system has insufficient
resources to process the
request.
@retval EFI_INVALID_PARAMETER The GUID in InputSection does
not match this instance of the
GUIDed Section Extraction
Protocol.
**/
EFI_STATUS
CustomDecompressExtractSection (
IN CONST EFI_GUIDED_SECTION_EXTRACTION_PROTOCOL *This,
IN CONST VOID *InputSection,
OUT VOID **OutputBuffer,
OUT UINTN *OutputSize,
OUT UINT32 *AuthenticationStatus
)
{
EFI_STATUS Status;
UINT8 *ScratchBuffer;
UINT32 DestinationSize;
UINT32 ScratchSize;
UINT32 SectionLength;
//
// Set authentic value to zero.
//
*AuthenticationStatus = 0;
//
// Calculate Section data Size
//
SectionLength = *(UINT32 *) (((EFI_COMMON_SECTION_HEADER *) InputSection)->Size) & 0x00ffffff;
//
// Get compressed data information
//
Status = CustomDecompressGetInfo (
(GUID *) ((UINT8 *) InputSection + sizeof (EFI_COMMON_SECTION_HEADER)),
(UINT8 *) InputSection + sizeof (EFI_GUID_DEFINED_SECTION),
SectionLength - sizeof (EFI_GUID_DEFINED_SECTION),
&DestinationSize,
&ScratchSize
);
if (EFI_ERROR (Status)) {
//
// GetInfo failed
//
DEBUG ((EFI_D_ERROR, "Extract guided section Failed - %r\n", Status));
return Status;
}
//
// Allocate scratch buffer
//
ScratchBuffer = CoreAllocateBootServicesPool (ScratchSize);
if (ScratchBuffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Allocate destination buffer
//
*OutputSize = (UINTN) DestinationSize;
*OutputBuffer = CoreAllocateBootServicesPool (*OutputSize);
if (*OutputBuffer == NULL) {
CoreFreePool (ScratchBuffer);
return EFI_OUT_OF_RESOURCES;
}
//
// Call decompress function
//
Status = CustomDecompress (
(GUID *) ((UINT8 *) InputSection + sizeof (EFI_COMMON_SECTION_HEADER)),
(UINT8 *) InputSection + sizeof (EFI_GUID_DEFINED_SECTION),
*OutputBuffer,
ScratchBuffer
);
if (EFI_ERROR (Status)) {
//
// Decompress failed
//
CoreFreePool (ScratchBuffer);
CoreFreePool (*OutputBuffer);
DEBUG ((EFI_D_ERROR, "Extract guided section Failed - %r\n", Status));
return Status;
}
//
// Free unused scratch buffer.
//
CoreFreePool (ScratchBuffer);
return EFI_SUCCESS;
}
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