1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2013 Politecnico di Torino, Italy
4 * TORSEC group -- https://security.polito.it
5 *
6 * Author: Roberto Sassu <roberto.sassu@polito.it>
7 *
8 * File: ima_template_lib.c
9 * Library of supported template fields.
10 */
11
12#include "ima_template_lib.h"
13#include <linux/xattr.h>
14#include <linux/evm.h>
15
16static bool ima_template_hash_algo_allowed(u8 algo)
17{
18 if (algo == HASH_ALGO_SHA1 || algo == HASH_ALGO_MD5)
19 return true;
20
21 return false;
22}
23
24enum data_formats {
25 DATA_FMT_DIGEST = 0,
26 DATA_FMT_DIGEST_WITH_ALGO,
27 DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO,
28 DATA_FMT_STRING,
29 DATA_FMT_HEX,
30 DATA_FMT_UINT
31};
32
33enum digest_type {
34 DIGEST_TYPE_IMA,
35 DIGEST_TYPE_VERITY,
36 DIGEST_TYPE__LAST
37};
38
39#define DIGEST_TYPE_NAME_LEN_MAX 7 /* including NUL */
40static const char * const digest_type_name[DIGEST_TYPE__LAST] = {
41 [DIGEST_TYPE_IMA] = "ima",
42 [DIGEST_TYPE_VERITY] = "verity"
43};
44
45static int ima_write_template_field_data(const void *data, const u32 datalen,
46 enum data_formats datafmt,
47 struct ima_field_data *field_data)
48{
49 u8 *buf, *buf_ptr;
50 u32 buflen = datalen;
51
52 if (datafmt == DATA_FMT_STRING)
53 buflen = datalen + 1;
54
55 buf = kzalloc(buflen, GFP_KERNEL);
56 if (!buf)
57 return -ENOMEM;
58
59 memcpy(buf, data, datalen);
60
61 /*
62 * Replace all space characters with underscore for event names and
63 * strings. This avoid that, during the parsing of a measurements list,
64 * filenames with spaces or that end with the suffix ' (deleted)' are
65 * split into multiple template fields (the space is the delimitator
66 * character for measurements lists in ASCII format).
67 */
68 if (datafmt == DATA_FMT_STRING) {
69 for (buf_ptr = buf; buf_ptr - buf < datalen; buf_ptr++)
70 if (*buf_ptr == ' ')
71 *buf_ptr = '_';
72 }
73
74 field_data->data = buf;
75 field_data->len = buflen;
76 return 0;
77}
78
79static void ima_show_template_data_ascii(struct seq_file *m,
80 enum ima_show_type show,
81 enum data_formats datafmt,
82 struct ima_field_data *field_data)
83{
84 u8 *buf_ptr = field_data->data;
85 u32 buflen = field_data->len;
86
87 switch (datafmt) {
88 case DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO:
89 case DATA_FMT_DIGEST_WITH_ALGO:
90 buf_ptr = strrchr(field_data->data, ':');
91 if (buf_ptr != field_data->data)
92 seq_printf(m, fmt: "%s", field_data->data);
93
94 /* skip ':' and '\0' */
95 buf_ptr += 2;
96 buflen -= buf_ptr - field_data->data;
97 fallthrough;
98 case DATA_FMT_DIGEST:
99 case DATA_FMT_HEX:
100 if (!buflen)
101 break;
102 ima_print_digest(m, digest: buf_ptr, size: buflen);
103 break;
104 case DATA_FMT_STRING:
105 seq_printf(m, fmt: "%s", buf_ptr);
106 break;
107 case DATA_FMT_UINT:
108 switch (field_data->len) {
109 case sizeof(u8):
110 seq_printf(m, fmt: "%u", *(u8 *)buf_ptr);
111 break;
112 case sizeof(u16):
113 if (ima_canonical_fmt)
114 seq_printf(m, fmt: "%u",
115 le16_to_cpu(*(__le16 *)buf_ptr));
116 else
117 seq_printf(m, fmt: "%u", *(u16 *)buf_ptr);
118 break;
119 case sizeof(u32):
120 if (ima_canonical_fmt)
121 seq_printf(m, fmt: "%u",
122 le32_to_cpu(*(__le32 *)buf_ptr));
123 else
124 seq_printf(m, fmt: "%u", *(u32 *)buf_ptr);
125 break;
126 case sizeof(u64):
127 if (ima_canonical_fmt)
128 seq_printf(m, fmt: "%llu",
129 le64_to_cpu(*(__le64 *)buf_ptr));
130 else
131 seq_printf(m, fmt: "%llu", *(u64 *)buf_ptr);
132 break;
133 default:
134 break;
135 }
136 break;
137 default:
138 break;
139 }
140}
141
142static void ima_show_template_data_binary(struct seq_file *m,
143 enum ima_show_type show,
144 enum data_formats datafmt,
145 struct ima_field_data *field_data)
146{
147 u32 len = (show == IMA_SHOW_BINARY_OLD_STRING_FMT) ?
148 strlen(field_data->data) : field_data->len;
149
150 if (show != IMA_SHOW_BINARY_NO_FIELD_LEN) {
151 u32 field_len = !ima_canonical_fmt ?
152 len : (__force u32)cpu_to_le32(len);
153
154 ima_putc(m, data: &field_len, datalen: sizeof(field_len));
155 }
156
157 if (!len)
158 return;
159
160 ima_putc(m, data: field_data->data, datalen: len);
161}
162
163static void ima_show_template_field_data(struct seq_file *m,
164 enum ima_show_type show,
165 enum data_formats datafmt,
166 struct ima_field_data *field_data)
167{
168 switch (show) {
169 case IMA_SHOW_ASCII:
170 ima_show_template_data_ascii(m, show, datafmt, field_data);
171 break;
172 case IMA_SHOW_BINARY:
173 case IMA_SHOW_BINARY_NO_FIELD_LEN:
174 case IMA_SHOW_BINARY_OLD_STRING_FMT:
175 ima_show_template_data_binary(m, show, datafmt, field_data);
176 break;
177 default:
178 break;
179 }
180}
181
182void ima_show_template_digest(struct seq_file *m, enum ima_show_type show,
183 struct ima_field_data *field_data)
184{
185 ima_show_template_field_data(m, show, datafmt: DATA_FMT_DIGEST, field_data);
186}
187
188void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show,
189 struct ima_field_data *field_data)
190{
191 ima_show_template_field_data(m, show, datafmt: DATA_FMT_DIGEST_WITH_ALGO,
192 field_data);
193}
194
195void ima_show_template_digest_ngv2(struct seq_file *m, enum ima_show_type show,
196 struct ima_field_data *field_data)
197{
198 ima_show_template_field_data(m, show,
199 datafmt: DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO,
200 field_data);
201}
202
203void ima_show_template_string(struct seq_file *m, enum ima_show_type show,
204 struct ima_field_data *field_data)
205{
206 ima_show_template_field_data(m, show, datafmt: DATA_FMT_STRING, field_data);
207}
208
209void ima_show_template_sig(struct seq_file *m, enum ima_show_type show,
210 struct ima_field_data *field_data)
211{
212 ima_show_template_field_data(m, show, datafmt: DATA_FMT_HEX, field_data);
213}
214
215void ima_show_template_buf(struct seq_file *m, enum ima_show_type show,
216 struct ima_field_data *field_data)
217{
218 ima_show_template_field_data(m, show, datafmt: DATA_FMT_HEX, field_data);
219}
220
221void ima_show_template_uint(struct seq_file *m, enum ima_show_type show,
222 struct ima_field_data *field_data)
223{
224 ima_show_template_field_data(m, show, datafmt: DATA_FMT_UINT, field_data);
225}
226
227/**
228 * ima_parse_buf() - Parses lengths and data from an input buffer
229 * @bufstartp: Buffer start address.
230 * @bufendp: Buffer end address.
231 * @bufcurp: Pointer to remaining (non-parsed) data.
232 * @maxfields: Length of fields array.
233 * @fields: Array containing lengths and pointers of parsed data.
234 * @curfields: Number of array items containing parsed data.
235 * @len_mask: Bitmap (if bit is set, data length should not be parsed).
236 * @enforce_mask: Check if curfields == maxfields and/or bufcurp == bufendp.
237 * @bufname: String identifier of the input buffer.
238 *
239 * Return: 0 on success, -EINVAL on error.
240 */
241int ima_parse_buf(void *bufstartp, void *bufendp, void **bufcurp,
242 int maxfields, struct ima_field_data *fields, int *curfields,
243 unsigned long *len_mask, int enforce_mask, char *bufname)
244{
245 void *bufp = bufstartp;
246 int i;
247
248 for (i = 0; i < maxfields; i++) {
249 if (len_mask == NULL || !test_bit(i, len_mask)) {
250 if (bufp > (bufendp - sizeof(u32)))
251 break;
252
253 if (ima_canonical_fmt)
254 fields[i].len = le32_to_cpu(*(__le32 *)bufp);
255 else
256 fields[i].len = *(u32 *)bufp;
257
258 bufp += sizeof(u32);
259 }
260
261 if (bufp > (bufendp - fields[i].len))
262 break;
263
264 fields[i].data = bufp;
265 bufp += fields[i].len;
266 }
267
268 if ((enforce_mask & ENFORCE_FIELDS) && i != maxfields) {
269 pr_err("%s: nr of fields mismatch: expected: %d, current: %d\n",
270 bufname, maxfields, i);
271 return -EINVAL;
272 }
273
274 if ((enforce_mask & ENFORCE_BUFEND) && bufp != bufendp) {
275 pr_err("%s: buf end mismatch: expected: %p, current: %p\n",
276 bufname, bufendp, bufp);
277 return -EINVAL;
278 }
279
280 if (curfields)
281 *curfields = i;
282
283 if (bufcurp)
284 *bufcurp = bufp;
285
286 return 0;
287}
288
289static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize,
290 u8 digest_type, u8 hash_algo,
291 struct ima_field_data *field_data)
292{
293 /*
294 * digest formats:
295 * - DATA_FMT_DIGEST: digest
296 * - DATA_FMT_DIGEST_WITH_ALGO: <hash algo> + ':' + '\0' + digest,
297 * - DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO:
298 * <digest type> + ':' + <hash algo> + ':' + '\0' + digest,
299 *
300 * where 'DATA_FMT_DIGEST' is the original digest format ('d')
301 * with a hash size limitation of 20 bytes,
302 * where <digest type> is either "ima" or "verity",
303 * where <hash algo> is the hash_algo_name[] string.
304 */
305 u8 buffer[DIGEST_TYPE_NAME_LEN_MAX + CRYPTO_MAX_ALG_NAME + 2 +
306 IMA_MAX_DIGEST_SIZE] = { 0 };
307 enum data_formats fmt = DATA_FMT_DIGEST;
308 u32 offset = 0;
309
310 if (digest_type < DIGEST_TYPE__LAST && hash_algo < HASH_ALGO__LAST) {
311 fmt = DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO;
312 offset += 1 + sprintf(buf: buffer, fmt: "%s:%s:",
313 digest_type_name[digest_type],
314 hash_algo_name[hash_algo]);
315 } else if (hash_algo < HASH_ALGO__LAST) {
316 fmt = DATA_FMT_DIGEST_WITH_ALGO;
317 offset += 1 + sprintf(buf: buffer, fmt: "%s:",
318 hash_algo_name[hash_algo]);
319 }
320
321 if (digest) {
322 memcpy(buffer + offset, digest, digestsize);
323 } else {
324 /*
325 * If digest is NULL, the event being recorded is a violation.
326 * Make room for the digest by increasing the offset by the
327 * hash algorithm digest size. If the hash algorithm is not
328 * specified increase the offset by IMA_DIGEST_SIZE which
329 * fits SHA1 or MD5
330 */
331 if (hash_algo < HASH_ALGO__LAST)
332 offset += hash_digest_size[hash_algo];
333 else
334 offset += IMA_DIGEST_SIZE;
335 }
336
337 return ima_write_template_field_data(data: buffer, datalen: offset + digestsize,
338 datafmt: fmt, field_data);
339}
340
341/*
342 * This function writes the digest of an event (with size limit).
343 */
344int ima_eventdigest_init(struct ima_event_data *event_data,
345 struct ima_field_data *field_data)
346{
347 struct ima_max_digest_data hash;
348 struct ima_digest_data *hash_hdr = container_of(&hash.hdr,
349 struct ima_digest_data, hdr);
350 u8 *cur_digest = NULL;
351 u32 cur_digestsize = 0;
352 struct inode *inode;
353 int result;
354
355 memset(&hash, 0, sizeof(hash));
356
357 if (event_data->violation) /* recording a violation. */
358 goto out;
359
360 if (ima_template_hash_algo_allowed(algo: event_data->iint->ima_hash->algo)) {
361 cur_digest = event_data->iint->ima_hash->digest;
362 cur_digestsize = event_data->iint->ima_hash->length;
363 goto out;
364 }
365
366 if ((const char *)event_data->filename == boot_aggregate_name) {
367 if (ima_tpm_chip) {
368 hash.hdr.algo = HASH_ALGO_SHA1;
369 result = ima_calc_boot_aggregate(hash: hash_hdr);
370
371 /* algo can change depending on available PCR banks */
372 if (!result && hash.hdr.algo != HASH_ALGO_SHA1)
373 result = -EINVAL;
374
375 if (result < 0)
376 memset(&hash, 0, sizeof(hash));
377 }
378
379 cur_digest = hash_hdr->digest;
380 cur_digestsize = hash_digest_size[HASH_ALGO_SHA1];
381 goto out;
382 }
383
384 if (!event_data->file) /* missing info to re-calculate the digest */
385 return -EINVAL;
386
387 inode = file_inode(f: event_data->file);
388 hash.hdr.algo = ima_template_hash_algo_allowed(algo: ima_hash_algo) ?
389 ima_hash_algo : HASH_ALGO_SHA1;
390 result = ima_calc_file_hash(file: event_data->file, hash: hash_hdr);
391 if (result) {
392 integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
393 fname: event_data->filename, op: "collect_data",
394 cause: "failed", result, info: 0);
395 return result;
396 }
397 cur_digest = hash_hdr->digest;
398 cur_digestsize = hash.hdr.length;
399out:
400 return ima_eventdigest_init_common(digest: cur_digest, digestsize: cur_digestsize,
401 digest_type: DIGEST_TYPE__LAST, hash_algo: HASH_ALGO__LAST,
402 field_data);
403}
404
405/*
406 * This function writes the digest of an event (without size limit).
407 */
408int ima_eventdigest_ng_init(struct ima_event_data *event_data,
409 struct ima_field_data *field_data)
410{
411 u8 *cur_digest = NULL, hash_algo = ima_hash_algo;
412 u32 cur_digestsize = 0;
413
414 if (event_data->violation) /* recording a violation. */
415 goto out;
416
417 cur_digest = event_data->iint->ima_hash->digest;
418 cur_digestsize = event_data->iint->ima_hash->length;
419
420 hash_algo = event_data->iint->ima_hash->algo;
421out:
422 return ima_eventdigest_init_common(digest: cur_digest, digestsize: cur_digestsize,
423 digest_type: DIGEST_TYPE__LAST, hash_algo,
424 field_data);
425}
426
427/*
428 * This function writes the digest of an event (without size limit),
429 * prefixed with both the digest type and hash algorithm.
430 */
431int ima_eventdigest_ngv2_init(struct ima_event_data *event_data,
432 struct ima_field_data *field_data)
433{
434 u8 *cur_digest = NULL, hash_algo = ima_hash_algo;
435 u32 cur_digestsize = 0;
436 u8 digest_type = DIGEST_TYPE_IMA;
437
438 if (event_data->violation) /* recording a violation. */
439 goto out;
440
441 cur_digest = event_data->iint->ima_hash->digest;
442 cur_digestsize = event_data->iint->ima_hash->length;
443
444 hash_algo = event_data->iint->ima_hash->algo;
445 if (event_data->iint->flags & IMA_VERITY_REQUIRED)
446 digest_type = DIGEST_TYPE_VERITY;
447out:
448 return ima_eventdigest_init_common(digest: cur_digest, digestsize: cur_digestsize,
449 digest_type, hash_algo,
450 field_data);
451}
452
453/*
454 * This function writes the digest of the file which is expected to match the
455 * digest contained in the file's appended signature.
456 */
457int ima_eventdigest_modsig_init(struct ima_event_data *event_data,
458 struct ima_field_data *field_data)
459{
460 enum hash_algo hash_algo;
461 const u8 *cur_digest;
462 u32 cur_digestsize;
463
464 if (!event_data->modsig)
465 return 0;
466
467 if (event_data->violation) {
468 /* Recording a violation. */
469 hash_algo = HASH_ALGO_SHA1;
470 cur_digest = NULL;
471 cur_digestsize = 0;
472 } else {
473 int rc;
474
475 rc = ima_get_modsig_digest(modsig: event_data->modsig, algo: &hash_algo,
476 digest: &cur_digest, digest_size: &cur_digestsize);
477 if (rc)
478 return rc;
479 else if (hash_algo == HASH_ALGO__LAST || cur_digestsize == 0)
480 /* There was some error collecting the digest. */
481 return -EINVAL;
482 }
483
484 return ima_eventdigest_init_common(digest: cur_digest, digestsize: cur_digestsize,
485 digest_type: DIGEST_TYPE__LAST, hash_algo,
486 field_data);
487}
488
489static int ima_eventname_init_common(struct ima_event_data *event_data,
490 struct ima_field_data *field_data,
491 bool size_limit)
492{
493 const char *cur_filename = NULL;
494 struct name_snapshot filename;
495 u32 cur_filename_len = 0;
496 bool snapshot = false;
497 int ret;
498
499 BUG_ON(event_data->filename == NULL && event_data->file == NULL);
500
501 if (event_data->filename) {
502 cur_filename = event_data->filename;
503 cur_filename_len = strlen(event_data->filename);
504
505 if (!size_limit || cur_filename_len <= IMA_EVENT_NAME_LEN_MAX)
506 goto out;
507 }
508
509 if (event_data->file) {
510 take_dentry_name_snapshot(&filename,
511 event_data->file->f_path.dentry);
512 snapshot = true;
513 cur_filename = filename.name.name;
514 cur_filename_len = strlen(cur_filename);
515 } else
516 /*
517 * Truncate filename if the latter is too long and
518 * the file descriptor is not available.
519 */
520 cur_filename_len = IMA_EVENT_NAME_LEN_MAX;
521out:
522 ret = ima_write_template_field_data(data: cur_filename, datalen: cur_filename_len,
523 datafmt: DATA_FMT_STRING, field_data);
524
525 if (snapshot)
526 release_dentry_name_snapshot(&filename);
527
528 return ret;
529}
530
531/*
532 * This function writes the name of an event (with size limit).
533 */
534int ima_eventname_init(struct ima_event_data *event_data,
535 struct ima_field_data *field_data)
536{
537 return ima_eventname_init_common(event_data, field_data, size_limit: true);
538}
539
540/*
541 * This function writes the name of an event (without size limit).
542 */
543int ima_eventname_ng_init(struct ima_event_data *event_data,
544 struct ima_field_data *field_data)
545{
546 return ima_eventname_init_common(event_data, field_data, size_limit: false);
547}
548
549/*
550 * ima_eventsig_init - include the file signature as part of the template data
551 */
552int ima_eventsig_init(struct ima_event_data *event_data,
553 struct ima_field_data *field_data)
554{
555 struct evm_ima_xattr_data *xattr_value = event_data->xattr_value;
556
557 if (!xattr_value ||
558 (xattr_value->type != EVM_IMA_XATTR_DIGSIG &&
559 xattr_value->type != IMA_VERITY_DIGSIG))
560 return ima_eventevmsig_init(event_data, field_data);
561
562 return ima_write_template_field_data(data: xattr_value, datalen: event_data->xattr_len,
563 datafmt: DATA_FMT_HEX, field_data);
564}
565
566/*
567 * ima_eventbuf_init - include the buffer(kexec-cmldine) as part of the
568 * template data.
569 */
570int ima_eventbuf_init(struct ima_event_data *event_data,
571 struct ima_field_data *field_data)
572{
573 if ((!event_data->buf) || (event_data->buf_len == 0))
574 return 0;
575
576 return ima_write_template_field_data(data: event_data->buf,
577 datalen: event_data->buf_len, datafmt: DATA_FMT_HEX,
578 field_data);
579}
580
581/*
582 * ima_eventmodsig_init - include the appended file signature as part of the
583 * template data
584 */
585int ima_eventmodsig_init(struct ima_event_data *event_data,
586 struct ima_field_data *field_data)
587{
588 const void *data;
589 u32 data_len;
590 int rc;
591
592 if (!event_data->modsig)
593 return 0;
594
595 /*
596 * modsig is a runtime structure containing pointers. Get its raw data
597 * instead.
598 */
599 rc = ima_get_raw_modsig(modsig: event_data->modsig, data: &data, data_len: &data_len);
600 if (rc)
601 return rc;
602
603 return ima_write_template_field_data(data, datalen: data_len, datafmt: DATA_FMT_HEX,
604 field_data);
605}
606
607/*
608 * ima_eventevmsig_init - include the EVM portable signature as part of the
609 * template data
610 */
611int ima_eventevmsig_init(struct ima_event_data *event_data,
612 struct ima_field_data *field_data)
613{
614 struct evm_ima_xattr_data *xattr_data = NULL;
615 int rc = 0;
616
617 if (!event_data->file)
618 return 0;
619
620 rc = vfs_getxattr_alloc(idmap: &nop_mnt_idmap, dentry: file_dentry(file: event_data->file),
621 XATTR_NAME_EVM, xattr_value: (char **)&xattr_data, size: 0,
622 GFP_NOFS);
623 if (rc <= 0 || xattr_data->type != EVM_XATTR_PORTABLE_DIGSIG) {
624 rc = 0;
625 goto out;
626 }
627
628 rc = ima_write_template_field_data(data: (char *)xattr_data, datalen: rc, datafmt: DATA_FMT_HEX,
629 field_data);
630
631out:
632 kfree(objp: xattr_data);
633 return rc;
634}
635
636static int ima_eventinodedac_init_common(struct ima_event_data *event_data,
637 struct ima_field_data *field_data,
638 bool get_uid)
639{
640 unsigned int id;
641
642 if (!event_data->file)
643 return 0;
644
645 if (get_uid)
646 id = i_uid_read(inode: file_inode(f: event_data->file));
647 else
648 id = i_gid_read(inode: file_inode(f: event_data->file));
649
650 if (ima_canonical_fmt) {
651 if (sizeof(id) == sizeof(u16))
652 id = (__force u16)cpu_to_le16(id);
653 else
654 id = (__force u32)cpu_to_le32(id);
655 }
656
657 return ima_write_template_field_data(data: (void *)&id, datalen: sizeof(id),
658 datafmt: DATA_FMT_UINT, field_data);
659}
660
661/*
662 * ima_eventinodeuid_init - include the inode UID as part of the template
663 * data
664 */
665int ima_eventinodeuid_init(struct ima_event_data *event_data,
666 struct ima_field_data *field_data)
667{
668 return ima_eventinodedac_init_common(event_data, field_data, get_uid: true);
669}
670
671/*
672 * ima_eventinodegid_init - include the inode GID as part of the template
673 * data
674 */
675int ima_eventinodegid_init(struct ima_event_data *event_data,
676 struct ima_field_data *field_data)
677{
678 return ima_eventinodedac_init_common(event_data, field_data, get_uid: false);
679}
680
681/*
682 * ima_eventinodemode_init - include the inode mode as part of the template
683 * data
684 */
685int ima_eventinodemode_init(struct ima_event_data *event_data,
686 struct ima_field_data *field_data)
687{
688 struct inode *inode;
689 u16 mode;
690
691 if (!event_data->file)
692 return 0;
693
694 inode = file_inode(f: event_data->file);
695 mode = inode->i_mode;
696 if (ima_canonical_fmt)
697 mode = (__force u16)cpu_to_le16(mode);
698
699 return ima_write_template_field_data(data: (char *)&mode, datalen: sizeof(mode),
700 datafmt: DATA_FMT_UINT, field_data);
701}
702
703static int ima_eventinodexattrs_init_common(struct ima_event_data *event_data,
704 struct ima_field_data *field_data,
705 char type)
706{
707 u8 *buffer = NULL;
708 int rc;
709
710 if (!event_data->file)
711 return 0;
712
713 rc = evm_read_protected_xattrs(dentry: file_dentry(file: event_data->file), NULL, buffer_size: 0,
714 type, canonical_fmt: ima_canonical_fmt);
715 if (rc < 0)
716 return 0;
717
718 buffer = kmalloc(rc, GFP_KERNEL);
719 if (!buffer)
720 return 0;
721
722 rc = evm_read_protected_xattrs(dentry: file_dentry(file: event_data->file), buffer,
723 buffer_size: rc, type, canonical_fmt: ima_canonical_fmt);
724 if (rc < 0) {
725 rc = 0;
726 goto out;
727 }
728
729 rc = ima_write_template_field_data(data: (char *)buffer, datalen: rc, datafmt: DATA_FMT_HEX,
730 field_data);
731out:
732 kfree(objp: buffer);
733 return rc;
734}
735
736/*
737 * ima_eventinodexattrnames_init - include a list of xattr names as part of the
738 * template data
739 */
740int ima_eventinodexattrnames_init(struct ima_event_data *event_data,
741 struct ima_field_data *field_data)
742{
743 return ima_eventinodexattrs_init_common(event_data, field_data, type: 'n');
744}
745
746/*
747 * ima_eventinodexattrlengths_init - include a list of xattr lengths as part of
748 * the template data
749 */
750int ima_eventinodexattrlengths_init(struct ima_event_data *event_data,
751 struct ima_field_data *field_data)
752{
753 return ima_eventinodexattrs_init_common(event_data, field_data, type: 'l');
754}
755
756/*
757 * ima_eventinodexattrvalues_init - include a list of xattr values as part of
758 * the template data
759 */
760int ima_eventinodexattrvalues_init(struct ima_event_data *event_data,
761 struct ima_field_data *field_data)
762{
763 return ima_eventinodexattrs_init_common(event_data, field_data, type: 'v');
764}
765

source code of linux/security/integrity/ima/ima_template_lib.c