diff options
Diffstat (limited to 'MdePkg/Library/UefiDevicePathLib/DevicePathUtilities.c')
| -rw-r--r-- | MdePkg/Library/UefiDevicePathLib/DevicePathUtilities.c | 230 |
1 files changed, 116 insertions, 114 deletions
diff --git a/MdePkg/Library/UefiDevicePathLib/DevicePathUtilities.c b/MdePkg/Library/UefiDevicePathLib/DevicePathUtilities.c index 27fac77a2a56..a478b26af159 100644 --- a/MdePkg/Library/UefiDevicePathLib/DevicePathUtilities.c +++ b/MdePkg/Library/UefiDevicePathLib/DevicePathUtilities.c @@ -8,14 +8,8 @@ environment varibles. Multi-instance device paths should never be placed on a Handle. - Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR> - 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. + Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent **/ @@ -35,12 +29,13 @@ GLOBAL_REMOVE_IF_UNREFERENCED CONST EFI_DEVICE_PATH_PROTOCOL mUefiDevicePathLib /** Determine whether a given device path is valid. - If DevicePath is NULL, then ASSERT(). @param DevicePath A pointer to a device path data structure. @param MaxSize The maximum size of the device path data structure. @retval TRUE DevicePath is valid. + @retval FALSE DevicePath is NULL. + @retval FALSE Maxsize is less than sizeof(EFI_DEVICE_PATH_PROTOCOL). @retval FALSE The length of any node node in the DevicePath is less than sizeof (EFI_DEVICE_PATH_PROTOCOL). @retval FALSE If MaxSize is not zero, the size of the DevicePath @@ -59,19 +54,17 @@ IsDevicePathValid ( UINTN Size; UINTN NodeLength; - ASSERT (DevicePath != NULL); - - if (MaxSize == 0) { - MaxSize = MAX_UINTN; - } - // - // Validate the input size big enough to touch the first node. + //Validate the input whether exists and its size big enough to touch the first node // - if (MaxSize < sizeof (EFI_DEVICE_PATH_PROTOCOL)) { + if (DevicePath == NULL || (MaxSize > 0 && MaxSize < END_DEVICE_PATH_LENGTH)) { return FALSE; } + if (MaxSize == 0) { + MaxSize = MAX_UINTN; + } + for (Count = 0, Size = 0; !IsDevicePathEnd (DevicePath); DevicePath = NextDevicePathNode (DevicePath)) { NodeLength = DevicePathNodeLength (DevicePath); if (NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) { @@ -96,6 +89,15 @@ IsDevicePathValid ( return FALSE; } } + + // + // FilePath must be a NULL-terminated string. + // + if (DevicePathType (DevicePath) == MEDIA_DEVICE_PATH && + DevicePathSubType (DevicePath) == MEDIA_FILEPATH_DP && + *(CHAR16 *)((UINT8 *)DevicePath + NodeLength - 2) != 0) { + return FALSE; + } } // @@ -152,9 +154,9 @@ DevicePathSubType ( /** Returns the 16-bit Length field of a device path node. - Returns the 16-bit Length field of the device path node specified by Node. + Returns the 16-bit Length field of the device path node specified by Node. Node is not required to be aligned on a 16-bit boundary, so it is recommended - that a function such as ReadUnaligned16() be used to extract the contents of + that a function such as ReadUnaligned16() be used to extract the contents of the Length field. If Node is NULL, then ASSERT(). @@ -177,14 +179,14 @@ DevicePathNodeLength ( /** Returns a pointer to the next node in a device path. - Returns a pointer to the device path node that follows the device path node + Returns a pointer to the device path node that follows the device path node specified by Node. If Node is NULL, then ASSERT(). @param Node A pointer to a device path node data structure. - @return a pointer to the device path node that follows the device path node + @return a pointer to the device path node that follows the device path node specified by Node. **/ @@ -200,23 +202,23 @@ NextDevicePathNode ( /** Determines if a device path node is an end node of a device path. - This includes nodes that are the end of a device path instance and nodes that + This includes nodes that are the end of a device path instance and nodes that are the end of an entire device path. - Determines if the device path node specified by Node is an end node of a device path. - This includes nodes that are the end of a device path instance and nodes that are the - end of an entire device path. If Node represents an end node of a device path, + Determines if the device path node specified by Node is an end node of a device path. + This includes nodes that are the end of a device path instance and nodes that are the + end of an entire device path. If Node represents an end node of a device path, then TRUE is returned. Otherwise, FALSE is returned. If Node is NULL, then ASSERT(). @param Node A pointer to a device path node data structure. - @retval TRUE The device path node specified by Node is an end node of a + @retval TRUE The device path node specified by Node is an end node of a device path. - @retval FALSE The device path node specified by Node is not an end node of + @retval FALSE The device path node specified by Node is not an end node of a device path. - + **/ BOOLEAN EFIAPI @@ -231,17 +233,17 @@ IsDevicePathEndType ( /** Determines if a device path node is an end node of an entire device path. - Determines if a device path node specified by Node is an end node of an entire - device path. If Node represents the end of an entire device path, then TRUE is + Determines if a device path node specified by Node is an end node of an entire + device path. If Node represents the end of an entire device path, then TRUE is returned. Otherwise, FALSE is returned. If Node is NULL, then ASSERT(). @param Node A pointer to a device path node data structure. - @retval TRUE The device path node specified by Node is the end of an entire + @retval TRUE The device path node specified by Node is the end of an entire device path. - @retval FALSE The device path node specified by Node is not the end of an + @retval FALSE The device path node specified by Node is not the end of an entire device path. **/ @@ -258,17 +260,17 @@ IsDevicePathEnd ( /** Determines if a device path node is an end node of a device path instance. - Determines if a device path node specified by Node is an end node of a device - path instance. If Node represents the end of a device path instance, then TRUE + Determines if a device path node specified by Node is an end node of a device + path instance. If Node represents the end of a device path instance, then TRUE is returned. Otherwise, FALSE is returned. If Node is NULL, then ASSERT(). @param Node A pointer to a device path node data structure. - @retval TRUE The device path node specified by Node is the end of a device + @retval TRUE The device path node specified by Node is the end of a device path instance. - @retval FALSE The device path node specified by Node is not the end of a + @retval FALSE The device path node specified by Node is not the end of a device path instance. **/ @@ -285,8 +287,8 @@ IsDevicePathEndInstance ( /** Sets the length, in bytes, of a device path node. - Sets the length of the device path node specified by Node to the value specified - by NodeLength. NodeLength is returned. Node is not required to be aligned on + Sets the length of the device path node specified by Node to the value specified + by NodeLength. NodeLength is returned. Node is not required to be aligned on a 16-bit boundary, so it is recommended that a function such as WriteUnaligned16() be used to set the contents of the Length field. @@ -315,15 +317,15 @@ SetDevicePathNodeLength ( /** Fills in all the fields of a device path node that is the end of an entire device path. - Fills in all the fields of a device path node specified by Node so Node represents - the end of an entire device path. The Type field of Node is set to - END_DEVICE_PATH_TYPE, the SubType field of Node is set to - END_ENTIRE_DEVICE_PATH_SUBTYPE, and the Length field of Node is set to - END_DEVICE_PATH_LENGTH. Node is not required to be aligned on a 16-bit boundary, - so it is recommended that a function such as WriteUnaligned16() be used to set - the contents of the Length field. + Fills in all the fields of a device path node specified by Node so Node represents + the end of an entire device path. The Type field of Node is set to + END_DEVICE_PATH_TYPE, the SubType field of Node is set to + END_ENTIRE_DEVICE_PATH_SUBTYPE, and the Length field of Node is set to + END_DEVICE_PATH_LENGTH. Node is not required to be aligned on a 16-bit boundary, + so it is recommended that a function such as WriteUnaligned16() be used to set + the contents of the Length field. - If Node is NULL, then ASSERT(). + If Node is NULL, then ASSERT(). @param Node A pointer to a device path node data structure. @@ -341,7 +343,7 @@ SetDevicePathEndNode ( /** Returns the size of a device path in bytes. - This function returns the size, in bytes, of the device path data structure + This function returns the size, in bytes, of the device path data structure specified by DevicePath including the end of device path node. If DevicePath is NULL or invalid, then 0 is returned. @@ -384,18 +386,18 @@ UefiDevicePathLibGetDevicePathSize ( /** Creates a new copy of an existing device path. - This function allocates space for a new copy of the device path specified by DevicePath. - If DevicePath is NULL, then NULL is returned. If the memory is successfully - allocated, then the contents of DevicePath are copied to the newly allocated - buffer, and a pointer to that buffer is returned. Otherwise, NULL is returned. - The memory for the new device path is allocated from EFI boot services memory. - It is the responsibility of the caller to free the memory allocated. - + This function allocates space for a new copy of the device path specified by DevicePath. + If DevicePath is NULL, then NULL is returned. If the memory is successfully + allocated, then the contents of DevicePath are copied to the newly allocated + buffer, and a pointer to that buffer is returned. Otherwise, NULL is returned. + The memory for the new device path is allocated from EFI boot services memory. + It is the responsibility of the caller to free the memory allocated. + @param DevicePath A pointer to a device path data structure. @retval NULL DevicePath is NULL or invalid. @retval Others A pointer to the duplicated device path. - + **/ EFI_DEVICE_PATH_PROTOCOL * EFIAPI @@ -423,21 +425,21 @@ UefiDevicePathLibDuplicateDevicePath ( /** Creates a new device path by appending a second device path to a first device path. - This function creates a new device path by appending a copy of SecondDevicePath - to a copy of FirstDevicePath in a newly allocated buffer. Only the end-of-device-path - device node from SecondDevicePath is retained. The newly created device path is - returned. If FirstDevicePath is NULL, then it is ignored, and a duplicate of - SecondDevicePath is returned. If SecondDevicePath is NULL, then it is ignored, - and a duplicate of FirstDevicePath is returned. If both FirstDevicePath and - SecondDevicePath are NULL, then a copy of an end-of-device-path is returned. - + This function creates a new device path by appending a copy of SecondDevicePath + to a copy of FirstDevicePath in a newly allocated buffer. Only the end-of-device-path + device node from SecondDevicePath is retained. The newly created device path is + returned. If FirstDevicePath is NULL, then it is ignored, and a duplicate of + SecondDevicePath is returned. If SecondDevicePath is NULL, then it is ignored, + and a duplicate of FirstDevicePath is returned. If both FirstDevicePath and + SecondDevicePath are NULL, then a copy of an end-of-device-path is returned. + If there is not enough memory for the newly allocated buffer, then NULL is returned. - The memory for the new device path is allocated from EFI boot services memory. + The memory for the new device path is allocated from EFI boot services memory. It is the responsibility of the caller to free the memory allocated. @param FirstDevicePath A pointer to a device path data structure. @param SecondDevicePath A pointer to a device path data structure. - + @retval NULL If there is not enough memory for the newly allocated buffer. @retval NULL If FirstDevicePath or SecondDevicePath is invalid. @retval Others A pointer to the new device path if success. @@ -498,18 +500,18 @@ UefiDevicePathLibAppendDevicePath ( /** Creates a new path by appending the device node to the device path. - This function creates a new device path by appending a copy of the device node - specified by DevicePathNode to a copy of the device path specified by DevicePath - in an allocated buffer. The end-of-device-path device node is moved after the + This function creates a new device path by appending a copy of the device node + specified by DevicePathNode to a copy of the device path specified by DevicePath + in an allocated buffer. The end-of-device-path device node is moved after the end of the appended device node. If DevicePathNode is NULL then a copy of DevicePath is returned. - If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device + If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device path device node is returned. - If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path + If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path device node is returned. - If there is not enough memory to allocate space for the new device path, then - NULL is returned. - The memory is allocated from EFI boot services memory. It is the responsibility + If there is not enough memory to allocate space for the new device path, then + NULL is returned. + The memory is allocated from EFI boot services memory. It is the responsibility of the caller to free the memory allocated. @param DevicePath A pointer to a device path data structure. @@ -517,9 +519,9 @@ UefiDevicePathLibAppendDevicePath ( @retval NULL If there is not enough memory for the new device path. @retval Others A pointer to the new device path if success. - A copy of DevicePathNode followed by an end-of-device-path node + A copy of DevicePathNode followed by an end-of-device-path node if both FirstDevicePath and SecondDevicePath are NULL. - A copy of an end-of-device-path node if both FirstDevicePath + A copy of an end-of-device-path node if both FirstDevicePath and SecondDevicePath are NULL. **/ @@ -566,20 +568,20 @@ UefiDevicePathLibAppendDevicePathNode ( /** Creates a new device path by appending the specified device path instance to the specified device path. - - This function creates a new device path by appending a copy of the device path - instance specified by DevicePathInstance to a copy of the device path specified + + This function creates a new device path by appending a copy of the device path + instance specified by DevicePathInstance to a copy of the device path specified by DevicePath in a allocated buffer. - The end-of-device-path device node is moved after the end of the appended device - path instance and a new end-of-device-path-instance node is inserted between. + The end-of-device-path device node is moved after the end of the appended device + path instance and a new end-of-device-path-instance node is inserted between. If DevicePath is NULL, then a copy if DevicePathInstance is returned. If DevicePathInstance is NULL, then NULL is returned. If DevicePath or DevicePathInstance is invalid, then NULL is returned. - If there is not enough memory to allocate space for the new device path, then - NULL is returned. - The memory is allocated from EFI boot services memory. It is the responsibility + If there is not enough memory to allocate space for the new device path, then + NULL is returned. + The memory is allocated from EFI boot services memory. It is the responsibility of the caller to free the memory allocated. - + @param DevicePath A pointer to a device path data structure. @param DevicePathInstance A pointer to a device path instance. @@ -615,13 +617,13 @@ UefiDevicePathLibAppendDevicePathInstance ( NewDevicePath = AllocatePool (SrcSize + InstanceSize); if (NewDevicePath != NULL) { - + TempDevicePath = CopyMem (NewDevicePath, DevicePath, SrcSize);; - + while (!IsDevicePathEnd (TempDevicePath)) { TempDevicePath = NextDevicePathNode (TempDevicePath); } - + TempDevicePath->SubType = END_INSTANCE_DEVICE_PATH_SUBTYPE; TempDevicePath = NextDevicePathNode (TempDevicePath); CopyMem (TempDevicePath, DevicePathInstance, InstanceSize); @@ -634,25 +636,25 @@ UefiDevicePathLibAppendDevicePathInstance ( Creates a copy of the current device path instance and returns a pointer to the next device path instance. - This function creates a copy of the current device path instance. It also updates - DevicePath to point to the next device path instance in the device path (or NULL + This function creates a copy of the current device path instance. It also updates + DevicePath to point to the next device path instance in the device path (or NULL if no more) and updates Size to hold the size of the device path instance copy. If DevicePath is NULL, then NULL is returned. If DevicePath points to a invalid device path, then NULL is returned. - If there is not enough memory to allocate space for the new device path, then - NULL is returned. - The memory is allocated from EFI boot services memory. It is the responsibility + If there is not enough memory to allocate space for the new device path, then + NULL is returned. + The memory is allocated from EFI boot services memory. It is the responsibility of the caller to free the memory allocated. If Size is NULL, then ASSERT(). - - @param DevicePath On input, this holds the pointer to the current - device path instance. On output, this holds - the pointer to the next device path instance + + @param DevicePath On input, this holds the pointer to the current + device path instance. On output, this holds + the pointer to the next device path instance or NULL if there are no more device path - instances in the device path pointer to a + instances in the device path pointer to a device path data structure. - @param Size On output, this holds the size of the device - path instance, in bytes or zero, if DevicePath + @param Size On output, this holds the size of the device + path instance, in bytes or zero, if DevicePath is NULL. @return A pointer to the current device path instance. @@ -692,7 +694,7 @@ UefiDevicePathLibGetNextDevicePathInstance ( // Compute the size of the device path instance // *Size = ((UINTN) DevPath - (UINTN) (*DevicePath)) + sizeof (EFI_DEVICE_PATH_PROTOCOL); - + // // Make a copy and return the device path instance // @@ -717,13 +719,13 @@ UefiDevicePathLibGetNextDevicePathInstance ( /** Creates a device node. - This function creates a new device node in a newly allocated buffer of size - NodeLength and initializes the device path node header with NodeType and NodeSubType. + This function creates a new device node in a newly allocated buffer of size + NodeLength and initializes the device path node header with NodeType and NodeSubType. The new device path node is returned. - If NodeLength is smaller than a device path header, then NULL is returned. - If there is not enough memory to allocate space for the new device path, then - NULL is returned. - The memory is allocated from EFI boot services memory. It is the responsibility + If NodeLength is smaller than a device path header, then NULL is returned. + If there is not enough memory to allocate space for the new device path, then + NULL is returned. + The memory is allocated from EFI boot services memory. It is the responsibility of the caller to free the memory allocated. @param NodeType The device node type for the new device node. @@ -749,7 +751,7 @@ UefiDevicePathLibCreateDeviceNode ( // return NULL; } - + DevicePath = AllocateZeroPool (NodeLength); if (DevicePath != NULL) { DevicePath->Type = NodeType; @@ -771,7 +773,7 @@ UefiDevicePathLibCreateDeviceNode ( @param DevicePath A pointer to a device path data structure. @retval TRUE DevicePath is multi-instance. - @retval FALSE DevicePath is not multi-instance, or DevicePath + @retval FALSE DevicePath is not multi-instance, or DevicePath is NULL or invalid. **/ @@ -807,11 +809,11 @@ UefiDevicePathLibIsDevicePathMultiInstance ( /** Retrieves the device path protocol from a handle. - This function returns the device path protocol from the handle specified by Handle. - If Handle is NULL or Handle does not contain a device path protocol, then NULL + This function returns the device path protocol from the handle specified by Handle. + If Handle is NULL or Handle does not contain a device path protocol, then NULL is returned. - - @param Handle The handle from which to retrieve the device + + @param Handle The handle from which to retrieve the device path protocol. @return The device path protocol from the handle specified by Handle. @@ -847,11 +849,11 @@ DevicePathFromHandle ( path node for the file specified by FileName is allocated and returned. The memory for the new device path is allocated from EFI boot services memory. It is the responsibility of the caller to free the memory allocated. - + If FileName is NULL, then ASSERT(). If FileName is not aligned on a 16-bit boundary, then ASSERT(). - @param Device A pointer to a device handle. This parameter + @param Device A pointer to a device handle. This parameter is optional and may be NULL. @param FileName A pointer to a Null-terminated Unicode string. |