disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/tpm_eventlog.h
..
..
@@ -3,12 +3,11 @@
3
3
 #ifndef __LINUX_TPM_EVENTLOG_H__
4
4
 #define __LINUX_TPM_EVENTLOG_H__
5
5
 
6
-#include <crypto/hash_info.h>
6
+#include <linux/tpm.h>
7
7
 
8
8
 #define TCG_EVENT_NAME_LEN_MAX	255
9
9
 #define MAX_TEXT_EVENT		1000	/* Max event string length */
10
10
 #define ACPI_TCPA_SIG		"TCPA"	/* 0x41504354 /'TCPA' */
11
-#define TPM2_ACTIVE_PCR_BANKS	3
12
11
 
13
12
 #define EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2 0x1
14
13
 #define EFI_TCG2_EVENT_LOG_FORMAT_TCG_2   0x2
..
..
@@ -29,7 +28,7 @@
29
28
 	u32 event_type;
30
29
 	u8 pcr_value[20];	/* SHA1 */
31
30
 	u32 event_size;
32
-	u8 event_data[0];
31
+	u8 event_data[];
33
32
 };
34
33
 
35
34
 enum tcpa_event_types {
..
..
@@ -56,7 +55,7 @@
56
55
 struct tcpa_pc_event {
57
56
 	u32 event_id;
58
57
 	u32 event_size;
59
-	u8 event_data[0];
58
+	u8 event_data[];
60
59
 };
61
60
 
62
61
 enum tcpa_pc_event_ids {
..
..
@@ -82,7 +81,9 @@
82
81
 	u16 digest_size;
83
82
 } __packed;
84
83
 
85
-struct tcg_efi_specid_event {
84
+#define TCG_SPECID_SIG "Spec ID Event03"
85
+
86
+struct tcg_efi_specid_event_head {
86
87
 	u8 signature[16];
87
88
 	u32 platform_class;
88
89
 	u8 spec_version_minor;
..
..
@@ -90,9 +91,7 @@
90
91
 	u8 spec_errata;
91
92
 	u8 uintnsize;
92
93
 	u32 num_algs;
93
-	struct tcg_efi_specid_event_algs digest_sizes[TPM2_ACTIVE_PCR_BANKS];
94
-	u8 vendor_info_size;
95
-	u8 vendor_info[0];
94
+	struct tcg_efi_specid_event_algs digest_sizes[];
96
95
 } __packed;
97
96
 
98
97
 struct tcg_pcr_event {
..
..
@@ -100,25 +99,196 @@
100
99
 	u32 event_type;
101
100
 	u8 digest[20];
102
101
 	u32 event_size;
103
-	u8 event[0];
102
+	u8 event[];
104
103
 } __packed;
105
104
 
106
105
 struct tcg_event_field {
107
106
 	u32 event_size;
108
-	u8 event[0];
107
+	u8 event[];
109
108
 } __packed;
110
109
 
111
-struct tpm2_digest {
112
-	u16 alg_id;
113
-	u8 digest[SHA512_DIGEST_SIZE];
114
-} __packed;
115
-
116
-struct tcg_pcr_event2 {
110
+struct tcg_pcr_event2_head {
117
111
 	u32 pcr_idx;
118
112
 	u32 event_type;
119
113
 	u32 count;
120
-	struct tpm2_digest digests[TPM2_ACTIVE_PCR_BANKS];
121
-	struct tcg_event_field event;
114
+	struct tpm_digest digests[];
122
115
 } __packed;
123
116
 
117
+struct tcg_algorithm_size {
118
+	u16 algorithm_id;
119
+	u16 algorithm_size;
120
+};
121
+
122
+struct tcg_algorithm_info {
123
+	u8 signature[16];
124
+	u32 platform_class;
125
+	u8 spec_version_minor;
126
+	u8 spec_version_major;
127
+	u8 spec_errata;
128
+	u8 uintn_size;
129
+	u32 number_of_algorithms;
130
+	struct tcg_algorithm_size digest_sizes[];
131
+};
132
+
133
+#ifndef TPM_MEMREMAP
134
+#define TPM_MEMREMAP(start, size) NULL
135
+#endif
136
+
137
+#ifndef TPM_MEMUNMAP
138
+#define TPM_MEMUNMAP(start, size) do{} while(0)
139
+#endif
140
+
141
+/**
142
+ * __calc_tpm2_event_size - calculate the size of a TPM2 event log entry
143
+ * @event:        Pointer to the event whose size should be calculated
144
+ * @event_header: Pointer to the initial event containing the digest lengths
145
+ * @do_mapping:   Whether or not the event needs to be mapped
146
+ *
147
+ * The TPM2 event log format can contain multiple digests corresponding to
148
+ * separate PCR banks, and also contains a variable length of the data that
149
+ * was measured. This requires knowledge of how long each digest type is,
150
+ * and this information is contained within the first event in the log.
151
+ *
152
+ * We calculate the length by examining the number of events, and then looking
153
+ * at each event in turn to determine how much space is used for events in
154
+ * total. Once we've done this we know the offset of the data length field,
155
+ * and can calculate the total size of the event.
156
+ *
157
+ * Return: size of the event on success, 0 on failure
158
+ */
159
+
160
+static __always_inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event,
161
+					 struct tcg_pcr_event *event_header,
162
+					 bool do_mapping)
163
+{
164
+	struct tcg_efi_specid_event_head *efispecid;
165
+	struct tcg_event_field *event_field;
166
+	void *mapping = NULL;
167
+	int mapping_size;
168
+	void *marker;
169
+	void *marker_start;
170
+	u32 halg_size;
171
+	size_t size;
172
+	u16 halg;
173
+	int i;
174
+	int j;
175
+	u32 count, event_type;
176
+	const u8 zero_digest[sizeof(event_header->digest)] = {0};
177
+
178
+	marker = event;
179
+	marker_start = marker;
180
+	marker = marker + sizeof(event->pcr_idx) + sizeof(event->event_type)
181
+		+ sizeof(event->count);
182
+
183
+	/* Map the event header */
184
+	if (do_mapping) {
185
+		mapping_size = marker - marker_start;
186
+		mapping = TPM_MEMREMAP((unsigned long)marker_start,
187
+				       mapping_size);
188
+		if (!mapping) {
189
+			size = 0;
190
+			goto out;
191
+		}
192
+	} else {
193
+		mapping = marker_start;
194
+	}
195
+
196
+	event = (struct tcg_pcr_event2_head *)mapping;
197
+	/*
198
+	 * The loop below will unmap these fields if the log is larger than
199
+	 * one page, so save them here for reference:
200
+	 */
201
+	count = event->count;
202
+	event_type = event->event_type;
203
+
204
+	/* Verify that it's the log header */
205
+	if (event_header->pcr_idx != 0 ||
206
+	    event_header->event_type != NO_ACTION ||
207
+	    memcmp(event_header->digest, zero_digest, sizeof(zero_digest))) {
208
+		size = 0;
209
+		goto out;
210
+	}
211
+
212
+	efispecid = (struct tcg_efi_specid_event_head *)event_header->event;
213
+
214
+	/*
215
+	 * Perform validation of the event in order to identify malformed
216
+	 * events. This function may be asked to parse arbitrary byte sequences
217
+	 * immediately following a valid event log. The caller expects this
218
+	 * function to recognize that the byte sequence is not a valid event
219
+	 * and to return an event size of 0.
220
+	 */
221
+	if (memcmp(efispecid->signature, TCG_SPECID_SIG,
222
+		   sizeof(TCG_SPECID_SIG)) ||
223
+	    !efispecid->num_algs || count != efispecid->num_algs) {
224
+		size = 0;
225
+		goto out;
226
+	}
227
+
228
+	for (i = 0; i < count; i++) {
229
+		halg_size = sizeof(event->digests[i].alg_id);
230
+
231
+		/* Map the digest's algorithm identifier */
232
+		if (do_mapping) {
233
+			TPM_MEMUNMAP(mapping, mapping_size);
234
+			mapping_size = halg_size;
235
+			mapping = TPM_MEMREMAP((unsigned long)marker,
236
+					     mapping_size);
237
+			if (!mapping) {
238
+				size = 0;
239
+				goto out;
240
+			}
241
+		} else {
242
+			mapping = marker;
243
+		}
244
+
245
+		memcpy(&halg, mapping, halg_size);
246
+		marker = marker + halg_size;
247
+
248
+		for (j = 0; j < efispecid->num_algs; j++) {
249
+			if (halg == efispecid->digest_sizes[j].alg_id) {
250
+				marker +=
251
+					efispecid->digest_sizes[j].digest_size;
252
+				break;
253
+			}
254
+		}
255
+		/* Algorithm without known length. Such event is unparseable. */
256
+		if (j == efispecid->num_algs) {
257
+			size = 0;
258
+			goto out;
259
+		}
260
+	}
261
+
262
+	/*
263
+	 * Map the event size - we don't read from the event itself, so
264
+	 * we don't need to map it
265
+	 */
266
+	if (do_mapping) {
267
+		TPM_MEMUNMAP(mapping, mapping_size);
268
+		mapping_size += sizeof(event_field->event_size);
269
+		mapping = TPM_MEMREMAP((unsigned long)marker,
270
+				       mapping_size);
271
+		if (!mapping) {
272
+			size = 0;
273
+			goto out;
274
+		}
275
+	} else {
276
+		mapping = marker;
277
+	}
278
+
279
+	event_field = (struct tcg_event_field *)mapping;
280
+
281
+	marker = marker + sizeof(event_field->event_size)
282
+		+ event_field->event_size;
283
+	size = marker - marker_start;
284
+
285
+	if (event_type == 0 && event_field->event_size == 0)
286
+		size = 0;
287
+
288
+out:
289
+	if (do_mapping)
290
+		TPM_MEMUNMAP(mapping, mapping_size);
291
+	return size;
292
+}
293
+
124
294
 #endif