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1 | /** @file\r | |
2 | Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>\r | |
3 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
4 | **/\r | |
5 | \r | |
6 | #include <PiPei.h>\r | |
7 | #include <Library/BaseLib.h>\r | |
8 | #include <Library/BaseMemoryLib.h>\r | |
9 | #include <Library/DebugLib.h>\r | |
10 | #include <Guid/VariableFormat.h>\r | |
11 | #include <Guid/SystemNvDataGuid.h>\r | |
12 | #include "PeilessStartupInternal.h"\r | |
13 | \r | |
14 | /**\r | |
15 | Check padding data all bit should be 1.\r | |
16 | \r | |
17 | @param[in] Buffer - A pointer to buffer header\r | |
18 | @param[in] BufferSize - Buffer size\r | |
19 | \r | |
20 | @retval TRUE - The padding data is valid.\r | |
21 | @retval TRUE - The padding data is invalid.\r | |
22 | \r | |
23 | **/\r | |
24 | BOOLEAN\r | |
25 | CheckPaddingData (\r | |
26 | IN UINT8 *Buffer,\r | |
27 | IN UINT32 BufferSize\r | |
28 | )\r | |
29 | {\r | |
30 | UINT32 index;\r | |
31 | \r | |
32 | for (index = 0; index < BufferSize; index++) {\r | |
33 | if (Buffer[index] != 0xFF) {\r | |
34 | return FALSE;\r | |
35 | }\r | |
36 | }\r | |
37 | \r | |
38 | return TRUE;\r | |
39 | }\r | |
40 | \r | |
41 | /**\r | |
42 | Check the integrity of CFV data.\r | |
43 | \r | |
44 | @param[in] TdxCfvBase - A pointer to CFV header\r | |
45 | @param[in] TdxCfvSize - CFV data size\r | |
46 | \r | |
47 | @retval TRUE - The CFV data is valid.\r | |
48 | @retval FALSE - The CFV data is invalid.\r | |
49 | \r | |
50 | **/\r | |
51 | BOOLEAN\r | |
52 | EFIAPI\r | |
53 | TdxValidateCfv (\r | |
54 | IN UINT8 *TdxCfvBase,\r | |
55 | IN UINT32 TdxCfvSize\r | |
56 | )\r | |
57 | {\r | |
58 | UINT16 Checksum;\r | |
59 | UINTN VariableBase;\r | |
60 | UINT32 VariableOffset;\r | |
61 | UINT32 VariableOffsetBeforeAlign;\r | |
62 | EFI_FIRMWARE_VOLUME_HEADER *CfvFvHeader;\r | |
63 | VARIABLE_STORE_HEADER *CfvVariableStoreHeader;\r | |
64 | AUTHENTICATED_VARIABLE_HEADER *VariableHeader;\r | |
65 | \r | |
66 | static EFI_GUID FvHdrGUID = EFI_SYSTEM_NV_DATA_FV_GUID;\r | |
67 | static EFI_GUID VarStoreHdrGUID = EFI_AUTHENTICATED_VARIABLE_GUID;\r | |
68 | \r | |
69 | VariableOffset = 0;\r | |
70 | \r | |
71 | if (TdxCfvBase == NULL) {\r | |
72 | DEBUG ((DEBUG_ERROR, "TDX CFV: CFV pointer is NULL\n"));\r | |
73 | return FALSE;\r | |
74 | }\r | |
75 | \r | |
76 | //\r | |
77 | // Verify the header zerovetor, filesystemguid,\r | |
78 | // revision, signature, attributes, fvlength, checksum\r | |
79 | // HeaderLength cannot be an odd number\r | |
80 | //\r | |
81 | CfvFvHeader = (EFI_FIRMWARE_VOLUME_HEADER *)TdxCfvBase;\r | |
82 | \r | |
83 | if ((!IsZeroBuffer (CfvFvHeader->ZeroVector, 16)) ||\r | |
84 | (!CompareGuid (&FvHdrGUID, &CfvFvHeader->FileSystemGuid)) ||\r | |
85 | (CfvFvHeader->Signature != EFI_FVH_SIGNATURE) ||\r | |
86 | (CfvFvHeader->Attributes != 0x4feff) ||\r | |
87 | (CfvFvHeader->Revision != EFI_FVH_REVISION) ||\r | |
88 | (CfvFvHeader->FvLength != TdxCfvSize)\r | |
89 | )\r | |
90 | {\r | |
91 | DEBUG ((DEBUG_ERROR, "TDX CFV: Basic FV headers were invalid\n"));\r | |
92 | return FALSE;\r | |
93 | }\r | |
94 | \r | |
95 | //\r | |
96 | // Verify the header checksum\r | |
97 | //\r | |
98 | Checksum = CalculateSum16 ((VOID *)CfvFvHeader, CfvFvHeader->HeaderLength);\r | |
99 | \r | |
100 | if (Checksum != 0) {\r | |
101 | DEBUG ((DEBUG_ERROR, "TDX CFV: FV checksum was invalid\n"));\r | |
102 | return FALSE;\r | |
103 | }\r | |
104 | \r | |
105 | //\r | |
106 | // Verify the header signature, size, format, state\r | |
107 | //\r | |
108 | CfvVariableStoreHeader = (VARIABLE_STORE_HEADER *)(TdxCfvBase + CfvFvHeader->HeaderLength);\r | |
109 | if ((!CompareGuid (&VarStoreHdrGUID, &CfvVariableStoreHeader->Signature)) ||\r | |
110 | (CfvVariableStoreHeader->Format != VARIABLE_STORE_FORMATTED) ||\r | |
111 | (CfvVariableStoreHeader->State != VARIABLE_STORE_HEALTHY) ||\r | |
112 | (CfvVariableStoreHeader->Size > (CfvFvHeader->FvLength - CfvFvHeader->HeaderLength)) ||\r | |
113 | (CfvVariableStoreHeader->Size < sizeof (VARIABLE_STORE_HEADER))\r | |
114 | )\r | |
115 | {\r | |
116 | DEBUG ((DEBUG_ERROR, "TDX CFV: Variable Store header was invalid\n"));\r | |
117 | return FALSE;\r | |
118 | }\r | |
119 | \r | |
120 | //\r | |
121 | // Verify the header startId, state\r | |
122 | // Verify data to the end\r | |
123 | //\r | |
124 | VariableBase = (UINTN)TdxCfvBase + CfvFvHeader->HeaderLength + sizeof (VARIABLE_STORE_HEADER);\r | |
125 | while (VariableOffset < (CfvVariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER))) {\r | |
126 | VariableHeader = (AUTHENTICATED_VARIABLE_HEADER *)(VariableBase + VariableOffset);\r | |
127 | if (VariableHeader->StartId != VARIABLE_DATA) {\r | |
128 | if (!CheckPaddingData ((UINT8 *)VariableHeader, CfvVariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER) - VariableOffset)) {\r | |
129 | DEBUG ((DEBUG_ERROR, "TDX CFV: Variable header was invalid\n"));\r | |
130 | return FALSE;\r | |
131 | }\r | |
132 | \r | |
133 | VariableOffset = CfvVariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER);\r | |
134 | } else {\r | |
135 | if (!((VariableHeader->State == VAR_IN_DELETED_TRANSITION) ||\r | |
136 | (VariableHeader->State == VAR_DELETED) ||\r | |
137 | (VariableHeader->State == VAR_HEADER_VALID_ONLY) ||\r | |
138 | (VariableHeader->State == VAR_ADDED)))\r | |
139 | {\r | |
140 | DEBUG ((DEBUG_ERROR, "TDX CFV: Variable header was invalid\n"));\r | |
141 | return FALSE;\r | |
142 | }\r | |
143 | \r | |
144 | VariableOffset += sizeof (AUTHENTICATED_VARIABLE_HEADER) + VariableHeader->NameSize + VariableHeader->DataSize;\r | |
145 | // Verify VariableOffset should be less than or equal CfvVariableStoreHeader->Size - sizeof(VARIABLE_STORE_HEADER)\r | |
146 | if (VariableOffset > (CfvVariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER))) {\r | |
147 | DEBUG ((DEBUG_ERROR, "TDX CFV: Variable header was invalid\n"));\r | |
148 | return FALSE;\r | |
149 | }\r | |
150 | \r | |
151 | VariableOffsetBeforeAlign = VariableOffset;\r | |
152 | // 4 byte align\r | |
153 | VariableOffset = (VariableOffset + 3) & (UINTN)(~3);\r | |
154 | \r | |
155 | if (!CheckPaddingData ((UINT8 *)(VariableBase + VariableOffsetBeforeAlign), VariableOffset - VariableOffsetBeforeAlign)) {\r | |
156 | DEBUG ((DEBUG_ERROR, "TDX CFV: Variable header was invalid\n"));\r | |
157 | return FALSE;\r | |
158 | }\r | |
159 | }\r | |
160 | }\r | |
161 | \r | |
162 | return TRUE;\r | |
163 | }\r |