1 /** @file
2
3 This library registers CRC32 guided section handler
4 to parse CRC32 encapsulation section and extract raw data.
5
6 Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
7 This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
11
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14
15 **/
16
17 #include <PiPei.h>
18 #include <Guid/Crc32GuidedSectionExtraction.h>
19 #include <Library/ExtractGuidedSectionLib.h>
20 #include <Library/DebugLib.h>
21 #include <Library/BaseMemoryLib.h>
22
23 ///
24 /// CRC32 Guided Section header
25 ///
26 typedef struct {
27 EFI_GUID_DEFINED_SECTION GuidedSectionHeader; ///< EFI guided section header
28 UINT32 CRC32Checksum; ///< 32bit CRC check sum
29 } CRC32_SECTION_HEADER;
30
31 typedef struct {
32 EFI_GUID_DEFINED_SECTION2 GuidedSectionHeader; ///< EFI guided section header
33 UINT32 CRC32Checksum; ///< 32bit CRC check sum
34 } CRC32_SECTION2_HEADER;
35
36 /**
37 This internal function reverses bits for 32bit data.
38
39 @param Value The data to be reversed.
40
41 @return Data reversed.
42
43 **/
44 UINT32
PeiCrc32GuidedSectionExtractLibReverseBits(UINT32 Value)45 PeiCrc32GuidedSectionExtractLibReverseBits (
46 UINT32 Value
47 )
48 {
49 UINTN Index;
50 UINT32 NewValue;
51
52 NewValue = 0;
53 for (Index = 0; Index < 32; Index++) {
54 if ((Value & (1 << Index)) != 0) {
55 NewValue = NewValue | (1 << (31 - Index));
56 }
57 }
58
59 return NewValue;
60 }
61
62 /**
63 Calculate CRC32 for target data.
64
65 @param Data The target data.
66 @param DataSize The target data size.
67 @param CrcOut The CRC32 for target data.
68
69 @retval EFI_SUCCESS The CRC32 for target data is calculated successfully.
70 @retval EFI_INVALID_PARAMETER Some parameter is not valid, so the CRC32 is not
71 calculated.
72
73 **/
74 EFI_STATUS
75 EFIAPI
PeiCrc32GuidedSectionExtractLibCalculateCrc32(IN VOID * Data,IN UINTN DataSize,OUT UINT32 * CrcOut)76 PeiCrc32GuidedSectionExtractLibCalculateCrc32 (
77 IN VOID *Data,
78 IN UINTN DataSize,
79 OUT UINT32 *CrcOut
80 )
81 {
82 UINT32 CrcTable[256];
83 UINTN TableEntry;
84 UINTN Index;
85 UINT32 Value;
86 UINT32 Crc;
87 UINT8 *Ptr;
88
89 if (Data == NULL || DataSize == 0 || CrcOut == NULL) {
90 return EFI_INVALID_PARAMETER;
91 }
92
93 //
94 // Initialize CRC32 table.
95 //
96 for (TableEntry = 0; TableEntry < 256; TableEntry++) {
97 Value = PeiCrc32GuidedSectionExtractLibReverseBits ((UINT32) TableEntry);
98 for (Index = 0; Index < 8; Index++) {
99 if ((Value & 0x80000000) != 0) {
100 Value = (Value << 1) ^ 0x04c11db7;
101 } else {
102 Value = Value << 1;
103 }
104 }
105 CrcTable[TableEntry] = PeiCrc32GuidedSectionExtractLibReverseBits (Value);
106 }
107
108 //
109 // Compute CRC
110 //
111 Crc = 0xffffffff;
112 for (Index = 0, Ptr = Data; Index < DataSize; Index++, Ptr++) {
113 Crc = (Crc >> 8) ^ CrcTable[(UINT8) Crc ^ *Ptr];
114 }
115
116 *CrcOut = Crc ^ 0xffffffff;
117 return EFI_SUCCESS;
118 }
119
120 /**
121
122 GetInfo gets raw data size and attribute of the input guided section.
123 It first checks whether the input guid section is supported.
124 If not, EFI_INVALID_PARAMETER will return.
125
126 @param InputSection Buffer containing the input GUIDed section to be processed.
127 @param OutputBufferSize The size of OutputBuffer.
128 @param ScratchBufferSize The size of ScratchBuffer.
129 @param SectionAttribute The attribute of the input guided section.
130
131 @retval EFI_SUCCESS The size of destination buffer, the size of scratch buffer and
132 the attribute of the input section are successfully retrieved.
133 @retval EFI_INVALID_PARAMETER The GUID in InputSection does not match this instance guid.
134
135 **/
136 EFI_STATUS
137 EFIAPI
Crc32GuidedSectionGetInfo(IN CONST VOID * InputSection,OUT UINT32 * OutputBufferSize,OUT UINT32 * ScratchBufferSize,OUT UINT16 * SectionAttribute)138 Crc32GuidedSectionGetInfo (
139 IN CONST VOID *InputSection,
140 OUT UINT32 *OutputBufferSize,
141 OUT UINT32 *ScratchBufferSize,
142 OUT UINT16 *SectionAttribute
143 )
144 {
145 if (IS_SECTION2 (InputSection)) {
146 //
147 // Check whether the input guid section is recognized.
148 //
149 if (!CompareGuid (
150 &gEfiCrc32GuidedSectionExtractionGuid,
151 &(((EFI_GUID_DEFINED_SECTION2 *) InputSection)->SectionDefinitionGuid))) {
152 return EFI_INVALID_PARAMETER;
153 }
154 //
155 // Retrieve the size and attribute of the input section data.
156 //
157 *SectionAttribute = ((EFI_GUID_DEFINED_SECTION2 *) InputSection)->Attributes;
158 *ScratchBufferSize = 0;
159 *OutputBufferSize = SECTION2_SIZE (InputSection) - ((EFI_GUID_DEFINED_SECTION2 *) InputSection)->DataOffset;
160 } else {
161 //
162 // Check whether the input guid section is recognized.
163 //
164 if (!CompareGuid (
165 &gEfiCrc32GuidedSectionExtractionGuid,
166 &(((EFI_GUID_DEFINED_SECTION *) InputSection)->SectionDefinitionGuid))) {
167 return EFI_INVALID_PARAMETER;
168 }
169 //
170 // Retrieve the size and attribute of the input section data.
171 //
172 *SectionAttribute = ((EFI_GUID_DEFINED_SECTION *) InputSection)->Attributes;
173 *ScratchBufferSize = 0;
174 *OutputBufferSize = SECTION_SIZE (InputSection) - ((EFI_GUID_DEFINED_SECTION *) InputSection)->DataOffset;
175 }
176
177 return EFI_SUCCESS;
178 }
179
180 /**
181
182 Extraction handler tries to extract raw data from the input guided section.
183 It also does authentication check for 32bit CRC value in the input guided section.
184 It first checks whether the input guid section is supported.
185 If not, EFI_INVALID_PARAMETER will return.
186
187 @param InputSection Buffer containing the input GUIDed section to be processed.
188 @param OutputBuffer Buffer to contain the output raw data allocated by the caller.
189 @param ScratchBuffer A pointer to a caller-allocated buffer for function internal use.
190 @param AuthenticationStatus A pointer to a caller-allocated UINT32 that indicates the
191 authentication status of the output buffer.
192
193 @retval EFI_SUCCESS Section Data and Auth Status is extracted successfully.
194 @retval EFI_INVALID_PARAMETER The GUID in InputSection does not match this instance guid.
195
196 **/
197 EFI_STATUS
198 EFIAPI
Crc32GuidedSectionHandler(IN CONST VOID * InputSection,OUT VOID ** OutputBuffer,IN VOID * ScratchBuffer,OPTIONAL OUT UINT32 * AuthenticationStatus)199 Crc32GuidedSectionHandler (
200 IN CONST VOID *InputSection,
201 OUT VOID **OutputBuffer,
202 IN VOID *ScratchBuffer, OPTIONAL
203 OUT UINT32 *AuthenticationStatus
204 )
205 {
206 EFI_STATUS Status;
207 UINT32 SectionCrc32Checksum;
208 UINT32 Crc32Checksum;
209 UINT32 OutputBufferSize;
210
211 if (IS_SECTION2 (InputSection)) {
212 //
213 // Check whether the input guid section is recognized.
214 //
215 if (!CompareGuid (
216 &gEfiCrc32GuidedSectionExtractionGuid,
217 &(((EFI_GUID_DEFINED_SECTION2 *) InputSection)->SectionDefinitionGuid))) {
218 return EFI_INVALID_PARAMETER;
219 }
220
221 //
222 // Get section Crc32 checksum.
223 //
224 SectionCrc32Checksum = ((CRC32_SECTION2_HEADER *) InputSection)->CRC32Checksum;
225 *OutputBuffer = (UINT8 *) InputSection + ((EFI_GUID_DEFINED_SECTION2 *) InputSection)->DataOffset;
226 OutputBufferSize = SECTION2_SIZE (InputSection) - ((EFI_GUID_DEFINED_SECTION2 *) InputSection)->DataOffset;
227
228 //
229 // Implicitly CRC32 GUIDed section should have STATUS_VALID bit set
230 //
231 ASSERT (((EFI_GUID_DEFINED_SECTION2 *) InputSection)->Attributes & EFI_GUIDED_SECTION_AUTH_STATUS_VALID);
232 *AuthenticationStatus = EFI_AUTH_STATUS_IMAGE_SIGNED;
233 } else {
234 //
235 // Check whether the input guid section is recognized.
236 //
237 if (!CompareGuid (
238 &gEfiCrc32GuidedSectionExtractionGuid,
239 &(((EFI_GUID_DEFINED_SECTION *) InputSection)->SectionDefinitionGuid))) {
240 return EFI_INVALID_PARAMETER;
241 }
242
243 //
244 // Get section Crc32 checksum.
245 //
246 SectionCrc32Checksum = ((CRC32_SECTION_HEADER *) InputSection)->CRC32Checksum;
247 *OutputBuffer = (UINT8 *) InputSection + ((EFI_GUID_DEFINED_SECTION *) InputSection)->DataOffset;
248 OutputBufferSize = SECTION_SIZE (InputSection) - ((EFI_GUID_DEFINED_SECTION *) InputSection)->DataOffset;
249
250 //
251 // Implicitly CRC32 GUIDed section should have STATUS_VALID bit set
252 //
253 ASSERT (((EFI_GUID_DEFINED_SECTION *) InputSection)->Attributes & EFI_GUIDED_SECTION_AUTH_STATUS_VALID);
254 *AuthenticationStatus = EFI_AUTH_STATUS_IMAGE_SIGNED;
255 }
256
257 //
258 // Init Checksum value to Zero.
259 //
260 Crc32Checksum = 0;
261
262 //
263 // Calculate CRC32 Checksum of Image
264 //
265 Status = PeiCrc32GuidedSectionExtractLibCalculateCrc32 (*OutputBuffer, OutputBufferSize, &Crc32Checksum);
266 if (Status == EFI_SUCCESS) {
267 if (Crc32Checksum != SectionCrc32Checksum) {
268 //
269 // If Crc32 checksum is not matched, AUTH tested failed bit is set.
270 //
271 *AuthenticationStatus |= EFI_AUTH_STATUS_TEST_FAILED;
272 }
273 } else {
274 //
275 // If Crc32 checksum is not calculated, AUTH not tested bit is set.
276 //
277 *AuthenticationStatus |= EFI_AUTH_STATUS_NOT_TESTED;
278 }
279
280 //
281 // Temp solution until PeiCore checks AUTH Status.
282 //
283 if ((*AuthenticationStatus & (EFI_AUTH_STATUS_TEST_FAILED | EFI_AUTH_STATUS_NOT_TESTED)) != 0) {
284 return EFI_ACCESS_DENIED;
285 }
286
287 return EFI_SUCCESS;
288 }
289
290 /**
291 Register the handler to extract CRC32 guided section.
292
293 @param FileHandle The handle of FFS header the loaded driver.
294 @param PeiServices The pointer to the PEI services.
295
296 @retval EFI_SUCCESS Register successfully.
297 @retval EFI_OUT_OF_RESOURCES Not enough memory to register this handler.
298
299 **/
300 EFI_STATUS
301 EFIAPI
PeiCrc32GuidedSectionExtractLibConstructor(IN EFI_PEI_FILE_HANDLE FileHandle,IN CONST EFI_PEI_SERVICES ** PeiServices)302 PeiCrc32GuidedSectionExtractLibConstructor (
303 IN EFI_PEI_FILE_HANDLE FileHandle,
304 IN CONST EFI_PEI_SERVICES **PeiServices
305 )
306 {
307 return ExtractGuidedSectionRegisterHandlers (
308 &gEfiCrc32GuidedSectionExtractionGuid,
309 Crc32GuidedSectionGetInfo,
310 Crc32GuidedSectionHandler
311 );
312 }
313