1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
6 * Mimi Zohar <zohar@us.ibm.com>
7 * Kylene Hall <kjhall@us.ibm.com>
10 * Calculates md5/sha1 file hash, template hash, boot-aggreate hash
13 #include <linux/kernel.h>
14 #include <linux/moduleparam.h>
15 #include <linux/ratelimit.h>
16 #include <linux/file.h>
17 #include <linux/crypto.h>
18 #include <linux/scatterlist.h>
19 #include <linux/err.h>
20 #include <linux/slab.h>
21 #include <crypto/hash.h>
25 /* minimum file size for ahash use */
26 static unsigned long ima_ahash_minsize
;
27 module_param_named(ahash_minsize
, ima_ahash_minsize
, ulong
, 0644);
28 MODULE_PARM_DESC(ahash_minsize
, "Minimum file size for ahash use");
30 /* default is 0 - 1 page. */
31 static int ima_maxorder
;
32 static unsigned int ima_bufsize
= PAGE_SIZE
;
34 static int param_set_bufsize(const char *val
, const struct kernel_param
*kp
)
36 unsigned long long size
;
39 size
= memparse(val
, NULL
);
40 order
= get_order(size
);
41 if (order
>= MAX_ORDER
)
44 ima_bufsize
= PAGE_SIZE
<< order
;
48 static const struct kernel_param_ops param_ops_bufsize
= {
49 .set
= param_set_bufsize
,
50 .get
= param_get_uint
,
52 #define param_check_bufsize(name, p) __param_check(name, p, unsigned int)
54 module_param_named(ahash_bufsize
, ima_bufsize
, bufsize
, 0644);
55 MODULE_PARM_DESC(ahash_bufsize
, "Maximum ahash buffer size");
57 static struct crypto_shash
*ima_shash_tfm
;
58 static struct crypto_ahash
*ima_ahash_tfm
;
60 struct ima_algo_desc
{
61 struct crypto_shash
*tfm
;
65 int ima_sha1_idx __ro_after_init
;
66 int ima_hash_algo_idx __ro_after_init
;
68 * Additional number of slots reserved, as needed, for SHA1
69 * and IMA default algo.
71 int ima_extra_slots __ro_after_init
;
73 static struct ima_algo_desc
*ima_algo_array
;
75 static int __init
ima_init_ima_crypto(void)
79 ima_shash_tfm
= crypto_alloc_shash(hash_algo_name
[ima_hash_algo
], 0, 0);
80 if (IS_ERR(ima_shash_tfm
)) {
81 rc
= PTR_ERR(ima_shash_tfm
);
82 pr_err("Can not allocate %s (reason: %ld)\n",
83 hash_algo_name
[ima_hash_algo
], rc
);
86 pr_info("Allocated hash algorithm: %s\n",
87 hash_algo_name
[ima_hash_algo
]);
91 static struct crypto_shash
*ima_alloc_tfm(enum hash_algo algo
)
93 struct crypto_shash
*tfm
= ima_shash_tfm
;
96 if (algo
< 0 || algo
>= HASH_ALGO__LAST
)
99 if (algo
== ima_hash_algo
)
102 for (i
= 0; i
< NR_BANKS(ima_tpm_chip
) + ima_extra_slots
; i
++)
103 if (ima_algo_array
[i
].tfm
&& ima_algo_array
[i
].algo
== algo
)
104 return ima_algo_array
[i
].tfm
;
106 tfm
= crypto_alloc_shash(hash_algo_name
[algo
], 0, 0);
109 pr_err("Can not allocate %s (reason: %d)\n",
110 hash_algo_name
[algo
], rc
);
115 int __init
ima_init_crypto(void)
121 rc
= ima_init_ima_crypto();
126 ima_hash_algo_idx
= -1;
128 for (i
= 0; i
< NR_BANKS(ima_tpm_chip
); i
++) {
129 algo
= ima_tpm_chip
->allocated_banks
[i
].crypto_id
;
130 if (algo
== HASH_ALGO_SHA1
)
133 if (algo
== ima_hash_algo
)
134 ima_hash_algo_idx
= i
;
137 if (ima_sha1_idx
< 0) {
138 ima_sha1_idx
= NR_BANKS(ima_tpm_chip
) + ima_extra_slots
++;
139 if (ima_hash_algo
== HASH_ALGO_SHA1
)
140 ima_hash_algo_idx
= ima_sha1_idx
;
143 if (ima_hash_algo_idx
< 0)
144 ima_hash_algo_idx
= NR_BANKS(ima_tpm_chip
) + ima_extra_slots
++;
146 ima_algo_array
= kcalloc(NR_BANKS(ima_tpm_chip
) + ima_extra_slots
,
147 sizeof(*ima_algo_array
), GFP_KERNEL
);
148 if (!ima_algo_array
) {
153 for (i
= 0; i
< NR_BANKS(ima_tpm_chip
); i
++) {
154 algo
= ima_tpm_chip
->allocated_banks
[i
].crypto_id
;
155 ima_algo_array
[i
].algo
= algo
;
157 /* unknown TPM algorithm */
158 if (algo
== HASH_ALGO__LAST
)
161 if (algo
== ima_hash_algo
) {
162 ima_algo_array
[i
].tfm
= ima_shash_tfm
;
166 ima_algo_array
[i
].tfm
= ima_alloc_tfm(algo
);
167 if (IS_ERR(ima_algo_array
[i
].tfm
)) {
168 if (algo
== HASH_ALGO_SHA1
) {
169 rc
= PTR_ERR(ima_algo_array
[i
].tfm
);
170 ima_algo_array
[i
].tfm
= NULL
;
174 ima_algo_array
[i
].tfm
= NULL
;
178 if (ima_sha1_idx
>= NR_BANKS(ima_tpm_chip
)) {
179 if (ima_hash_algo
== HASH_ALGO_SHA1
) {
180 ima_algo_array
[ima_sha1_idx
].tfm
= ima_shash_tfm
;
182 ima_algo_array
[ima_sha1_idx
].tfm
=
183 ima_alloc_tfm(HASH_ALGO_SHA1
);
184 if (IS_ERR(ima_algo_array
[ima_sha1_idx
].tfm
)) {
185 rc
= PTR_ERR(ima_algo_array
[ima_sha1_idx
].tfm
);
190 ima_algo_array
[ima_sha1_idx
].algo
= HASH_ALGO_SHA1
;
193 if (ima_hash_algo_idx
>= NR_BANKS(ima_tpm_chip
) &&
194 ima_hash_algo_idx
!= ima_sha1_idx
) {
195 ima_algo_array
[ima_hash_algo_idx
].tfm
= ima_shash_tfm
;
196 ima_algo_array
[ima_hash_algo_idx
].algo
= ima_hash_algo
;
201 for (i
= 0; i
< NR_BANKS(ima_tpm_chip
) + ima_extra_slots
; i
++) {
202 if (!ima_algo_array
[i
].tfm
||
203 ima_algo_array
[i
].tfm
== ima_shash_tfm
)
206 crypto_free_shash(ima_algo_array
[i
].tfm
);
209 crypto_free_shash(ima_shash_tfm
);
213 static void ima_free_tfm(struct crypto_shash
*tfm
)
217 if (tfm
== ima_shash_tfm
)
220 for (i
= 0; i
< NR_BANKS(ima_tpm_chip
) + ima_extra_slots
; i
++)
221 if (ima_algo_array
[i
].tfm
== tfm
)
224 crypto_free_shash(tfm
);
228 * ima_alloc_pages() - Allocate contiguous pages.
229 * @max_size: Maximum amount of memory to allocate.
230 * @allocated_size: Returned size of actual allocation.
231 * @last_warn: Should the min_size allocation warn or not.
233 * Tries to do opportunistic allocation for memory first trying to allocate
234 * max_size amount of memory and then splitting that until zero order is
235 * reached. Allocation is tried without generating allocation warnings unless
236 * last_warn is set. Last_warn set affects only last allocation of zero order.
238 * By default, ima_maxorder is 0 and it is equivalent to kmalloc(GFP_KERNEL)
240 * Return pointer to allocated memory, or NULL on failure.
242 static void *ima_alloc_pages(loff_t max_size
, size_t *allocated_size
,
246 int order
= ima_maxorder
;
247 gfp_t gfp_mask
= __GFP_RECLAIM
| __GFP_NOWARN
| __GFP_NORETRY
;
250 order
= min(get_order(max_size
), order
);
252 for (; order
; order
--) {
253 ptr
= (void *)__get_free_pages(gfp_mask
, order
);
255 *allocated_size
= PAGE_SIZE
<< order
;
260 /* order is zero - one page */
262 gfp_mask
= GFP_KERNEL
;
265 gfp_mask
|= __GFP_NOWARN
;
267 ptr
= (void *)__get_free_pages(gfp_mask
, 0);
269 *allocated_size
= PAGE_SIZE
;
278 * ima_free_pages() - Free pages allocated by ima_alloc_pages().
279 * @ptr: Pointer to allocated pages.
280 * @size: Size of allocated buffer.
282 static void ima_free_pages(void *ptr
, size_t size
)
286 free_pages((unsigned long)ptr
, get_order(size
));
289 static struct crypto_ahash
*ima_alloc_atfm(enum hash_algo algo
)
291 struct crypto_ahash
*tfm
= ima_ahash_tfm
;
294 if (algo
< 0 || algo
>= HASH_ALGO__LAST
)
295 algo
= ima_hash_algo
;
297 if (algo
!= ima_hash_algo
|| !tfm
) {
298 tfm
= crypto_alloc_ahash(hash_algo_name
[algo
], 0, 0);
300 if (algo
== ima_hash_algo
)
304 pr_err("Can not allocate %s (reason: %d)\n",
305 hash_algo_name
[algo
], rc
);
311 static void ima_free_atfm(struct crypto_ahash
*tfm
)
313 if (tfm
!= ima_ahash_tfm
)
314 crypto_free_ahash(tfm
);
317 static inline int ahash_wait(int err
, struct crypto_wait
*wait
)
320 err
= crypto_wait_req(err
, wait
);
323 pr_crit_ratelimited("ahash calculation failed: err: %d\n", err
);
328 static int ima_calc_file_hash_atfm(struct file
*file
,
329 struct ima_digest_data
*hash
,
330 struct crypto_ahash
*tfm
)
332 loff_t i_size
, offset
;
333 char *rbuf
[2] = { NULL
, };
334 int rc
, rbuf_len
, active
= 0, ahash_rc
= 0;
335 struct ahash_request
*req
;
336 struct scatterlist sg
[1];
337 struct crypto_wait wait
;
340 hash
->length
= crypto_ahash_digestsize(tfm
);
342 req
= ahash_request_alloc(tfm
, GFP_KERNEL
);
346 crypto_init_wait(&wait
);
347 ahash_request_set_callback(req
, CRYPTO_TFM_REQ_MAY_BACKLOG
|
348 CRYPTO_TFM_REQ_MAY_SLEEP
,
349 crypto_req_done
, &wait
);
351 rc
= ahash_wait(crypto_ahash_init(req
), &wait
);
355 i_size
= i_size_read(file_inode(file
));
361 * Try to allocate maximum size of memory.
362 * Fail if even a single page cannot be allocated.
364 rbuf
[0] = ima_alloc_pages(i_size
, &rbuf_size
[0], 1);
370 /* Only allocate one buffer if that is enough. */
371 if (i_size
> rbuf_size
[0]) {
373 * Try to allocate secondary buffer. If that fails fallback to
374 * using single buffering. Use previous memory allocation size
375 * as baseline for possible allocation size.
377 rbuf
[1] = ima_alloc_pages(i_size
- rbuf_size
[0],
381 for (offset
= 0; offset
< i_size
; offset
+= rbuf_len
) {
382 if (!rbuf
[1] && offset
) {
383 /* Not using two buffers, and it is not the first
384 * read/request, wait for the completion of the
385 * previous ahash_update() request.
387 rc
= ahash_wait(ahash_rc
, &wait
);
392 rbuf_len
= min_t(loff_t
, i_size
- offset
, rbuf_size
[active
]);
393 rc
= integrity_kernel_read(file
, offset
, rbuf
[active
],
395 if (rc
!= rbuf_len
) {
399 * Forward current rc, do not overwrite with return value
402 ahash_wait(ahash_rc
, &wait
);
406 if (rbuf
[1] && offset
) {
407 /* Using two buffers, and it is not the first
408 * read/request, wait for the completion of the
409 * previous ahash_update() request.
411 rc
= ahash_wait(ahash_rc
, &wait
);
416 sg_init_one(&sg
[0], rbuf
[active
], rbuf_len
);
417 ahash_request_set_crypt(req
, sg
, NULL
, rbuf_len
);
419 ahash_rc
= crypto_ahash_update(req
);
422 active
= !active
; /* swap buffers, if we use two */
424 /* wait for the last update request to complete */
425 rc
= ahash_wait(ahash_rc
, &wait
);
427 ima_free_pages(rbuf
[0], rbuf_size
[0]);
428 ima_free_pages(rbuf
[1], rbuf_size
[1]);
431 ahash_request_set_crypt(req
, NULL
, hash
->digest
, 0);
432 rc
= ahash_wait(crypto_ahash_final(req
), &wait
);
435 ahash_request_free(req
);
439 static int ima_calc_file_ahash(struct file
*file
, struct ima_digest_data
*hash
)
441 struct crypto_ahash
*tfm
;
444 tfm
= ima_alloc_atfm(hash
->algo
);
448 rc
= ima_calc_file_hash_atfm(file
, hash
, tfm
);
455 static int ima_calc_file_hash_tfm(struct file
*file
,
456 struct ima_digest_data
*hash
,
457 struct crypto_shash
*tfm
)
459 loff_t i_size
, offset
= 0;
462 SHASH_DESC_ON_STACK(shash
, tfm
);
466 hash
->length
= crypto_shash_digestsize(tfm
);
468 rc
= crypto_shash_init(shash
);
472 i_size
= i_size_read(file_inode(file
));
477 rbuf
= kzalloc(PAGE_SIZE
, GFP_KERNEL
);
481 while (offset
< i_size
) {
484 rbuf_len
= integrity_kernel_read(file
, offset
, rbuf
, PAGE_SIZE
);
489 if (rbuf_len
== 0) { /* unexpected EOF */
495 rc
= crypto_shash_update(shash
, rbuf
, rbuf_len
);
502 rc
= crypto_shash_final(shash
, hash
->digest
);
506 static int ima_calc_file_shash(struct file
*file
, struct ima_digest_data
*hash
)
508 struct crypto_shash
*tfm
;
511 tfm
= ima_alloc_tfm(hash
->algo
);
515 rc
= ima_calc_file_hash_tfm(file
, hash
, tfm
);
523 * ima_calc_file_hash - calculate file hash
525 * Asynchronous hash (ahash) allows using HW acceleration for calculating
526 * a hash. ahash performance varies for different data sizes on different
527 * crypto accelerators. shash performance might be better for smaller files.
528 * The 'ima.ahash_minsize' module parameter allows specifying the best
529 * minimum file size for using ahash on the system.
531 * If the ima.ahash_minsize parameter is not specified, this function uses
532 * shash for the hash calculation. If ahash fails, it falls back to using
535 int ima_calc_file_hash(struct file
*file
, struct ima_digest_data
*hash
)
539 struct file
*f
= file
;
540 bool new_file_instance
= false;
543 * For consistency, fail file's opened with the O_DIRECT flag on
544 * filesystems mounted with/without DAX option.
546 if (file
->f_flags
& O_DIRECT
) {
547 hash
->length
= hash_digest_size
[ima_hash_algo
];
548 hash
->algo
= ima_hash_algo
;
552 /* Open a new file instance in O_RDONLY if we cannot read */
553 if (!(file
->f_mode
& FMODE_READ
)) {
554 int flags
= file
->f_flags
& ~(O_WRONLY
| O_APPEND
|
555 O_TRUNC
| O_CREAT
| O_NOCTTY
| O_EXCL
);
557 f
= dentry_open(&file
->f_path
, flags
, file
->f_cred
);
561 new_file_instance
= true;
564 i_size
= i_size_read(file_inode(f
));
566 if (ima_ahash_minsize
&& i_size
>= ima_ahash_minsize
) {
567 rc
= ima_calc_file_ahash(f
, hash
);
572 rc
= ima_calc_file_shash(f
, hash
);
574 if (new_file_instance
)
580 * Calculate the hash of template data
582 static int ima_calc_field_array_hash_tfm(struct ima_field_data
*field_data
,
583 struct ima_template_entry
*entry
,
586 SHASH_DESC_ON_STACK(shash
, ima_algo_array
[tfm_idx
].tfm
);
587 struct ima_template_desc
*td
= entry
->template_desc
;
588 int num_fields
= entry
->template_desc
->num_fields
;
591 shash
->tfm
= ima_algo_array
[tfm_idx
].tfm
;
593 rc
= crypto_shash_init(shash
);
597 for (i
= 0; i
< num_fields
; i
++) {
598 u8 buffer
[IMA_EVENT_NAME_LEN_MAX
+ 1] = { 0 };
599 u8
*data_to_hash
= field_data
[i
].data
;
600 u32 datalen
= field_data
[i
].len
;
601 u32 datalen_to_hash
=
602 !ima_canonical_fmt
? datalen
: cpu_to_le32(datalen
);
604 if (strcmp(td
->name
, IMA_TEMPLATE_IMA_NAME
) != 0) {
605 rc
= crypto_shash_update(shash
,
606 (const u8
*) &datalen_to_hash
,
607 sizeof(datalen_to_hash
));
610 } else if (strcmp(td
->fields
[i
]->field_id
, "n") == 0) {
611 memcpy(buffer
, data_to_hash
, datalen
);
612 data_to_hash
= buffer
;
613 datalen
= IMA_EVENT_NAME_LEN_MAX
+ 1;
615 rc
= crypto_shash_update(shash
, data_to_hash
, datalen
);
621 rc
= crypto_shash_final(shash
, entry
->digests
[tfm_idx
].digest
);
626 int ima_calc_field_array_hash(struct ima_field_data
*field_data
,
627 struct ima_template_entry
*entry
)
632 rc
= ima_calc_field_array_hash_tfm(field_data
, entry
, ima_sha1_idx
);
636 entry
->digests
[ima_sha1_idx
].alg_id
= TPM_ALG_SHA1
;
638 for (i
= 0; i
< NR_BANKS(ima_tpm_chip
) + ima_extra_slots
; i
++) {
639 if (i
== ima_sha1_idx
)
642 if (i
< NR_BANKS(ima_tpm_chip
)) {
643 alg_id
= ima_tpm_chip
->allocated_banks
[i
].alg_id
;
644 entry
->digests
[i
].alg_id
= alg_id
;
647 /* for unmapped TPM algorithms digest is still a padded SHA1 */
648 if (!ima_algo_array
[i
].tfm
) {
649 memcpy(entry
->digests
[i
].digest
,
650 entry
->digests
[ima_sha1_idx
].digest
,
655 rc
= ima_calc_field_array_hash_tfm(field_data
, entry
, i
);
662 static int calc_buffer_ahash_atfm(const void *buf
, loff_t len
,
663 struct ima_digest_data
*hash
,
664 struct crypto_ahash
*tfm
)
666 struct ahash_request
*req
;
667 struct scatterlist sg
;
668 struct crypto_wait wait
;
669 int rc
, ahash_rc
= 0;
671 hash
->length
= crypto_ahash_digestsize(tfm
);
673 req
= ahash_request_alloc(tfm
, GFP_KERNEL
);
677 crypto_init_wait(&wait
);
678 ahash_request_set_callback(req
, CRYPTO_TFM_REQ_MAY_BACKLOG
|
679 CRYPTO_TFM_REQ_MAY_SLEEP
,
680 crypto_req_done
, &wait
);
682 rc
= ahash_wait(crypto_ahash_init(req
), &wait
);
686 sg_init_one(&sg
, buf
, len
);
687 ahash_request_set_crypt(req
, &sg
, NULL
, len
);
689 ahash_rc
= crypto_ahash_update(req
);
691 /* wait for the update request to complete */
692 rc
= ahash_wait(ahash_rc
, &wait
);
694 ahash_request_set_crypt(req
, NULL
, hash
->digest
, 0);
695 rc
= ahash_wait(crypto_ahash_final(req
), &wait
);
698 ahash_request_free(req
);
702 static int calc_buffer_ahash(const void *buf
, loff_t len
,
703 struct ima_digest_data
*hash
)
705 struct crypto_ahash
*tfm
;
708 tfm
= ima_alloc_atfm(hash
->algo
);
712 rc
= calc_buffer_ahash_atfm(buf
, len
, hash
, tfm
);
719 static int calc_buffer_shash_tfm(const void *buf
, loff_t size
,
720 struct ima_digest_data
*hash
,
721 struct crypto_shash
*tfm
)
723 SHASH_DESC_ON_STACK(shash
, tfm
);
729 hash
->length
= crypto_shash_digestsize(tfm
);
731 rc
= crypto_shash_init(shash
);
736 len
= size
< PAGE_SIZE
? size
: PAGE_SIZE
;
737 rc
= crypto_shash_update(shash
, buf
, len
);
745 rc
= crypto_shash_final(shash
, hash
->digest
);
749 static int calc_buffer_shash(const void *buf
, loff_t len
,
750 struct ima_digest_data
*hash
)
752 struct crypto_shash
*tfm
;
755 tfm
= ima_alloc_tfm(hash
->algo
);
759 rc
= calc_buffer_shash_tfm(buf
, len
, hash
, tfm
);
765 int ima_calc_buffer_hash(const void *buf
, loff_t len
,
766 struct ima_digest_data
*hash
)
770 if (ima_ahash_minsize
&& len
>= ima_ahash_minsize
) {
771 rc
= calc_buffer_ahash(buf
, len
, hash
);
776 return calc_buffer_shash(buf
, len
, hash
);
779 static void ima_pcrread(u32 idx
, struct tpm_digest
*d
)
784 if (tpm_pcr_read(ima_tpm_chip
, idx
, d
) != 0)
785 pr_err("Error Communicating to TPM chip\n");
789 * The boot_aggregate is a cumulative hash over TPM registers 0 - 7. With
790 * TPM 1.2 the boot_aggregate was based on reading the SHA1 PCRs, but with
791 * TPM 2.0 hash agility, TPM chips could support multiple TPM PCR banks,
792 * allowing firmware to configure and enable different banks.
794 * Knowing which TPM bank is read to calculate the boot_aggregate digest
795 * needs to be conveyed to a verifier. For this reason, use the same
796 * hash algorithm for reading the TPM PCRs as for calculating the boot
797 * aggregate digest as stored in the measurement list.
799 static int ima_calc_boot_aggregate_tfm(char *digest
, u16 alg_id
,
800 struct crypto_shash
*tfm
)
802 struct tpm_digest d
= { .alg_id
= alg_id
, .digest
= {0} };
805 SHASH_DESC_ON_STACK(shash
, tfm
);
809 pr_devel("calculating the boot-aggregate based on TPM bank: %04x\n",
812 rc
= crypto_shash_init(shash
);
816 /* cumulative digest over TPM registers 0-7 */
817 for (i
= TPM_PCR0
; i
< TPM_PCR8
; i
++) {
819 /* now accumulate with current aggregate */
820 rc
= crypto_shash_update(shash
, d
.digest
,
821 crypto_shash_digestsize(tfm
));
826 * Extend cumulative digest over TPM registers 8-9, which contain
827 * measurement for the kernel command line (reg. 8) and image (reg. 9)
828 * in a typical PCR allocation. Registers 8-9 are only included in
829 * non-SHA1 boot_aggregate digests to avoid ambiguity.
831 if (alg_id
!= TPM_ALG_SHA1
) {
832 for (i
= TPM_PCR8
; i
< TPM_PCR10
; i
++) {
834 rc
= crypto_shash_update(shash
, d
.digest
,
835 crypto_shash_digestsize(tfm
));
839 crypto_shash_final(shash
, digest
);
843 int ima_calc_boot_aggregate(struct ima_digest_data
*hash
)
845 struct crypto_shash
*tfm
;
846 u16 crypto_id
, alg_id
;
847 int rc
, i
, bank_idx
= -1;
849 for (i
= 0; i
< ima_tpm_chip
->nr_allocated_banks
; i
++) {
850 crypto_id
= ima_tpm_chip
->allocated_banks
[i
].crypto_id
;
851 if (crypto_id
== hash
->algo
) {
856 if (crypto_id
== HASH_ALGO_SHA256
)
859 if (bank_idx
== -1 && crypto_id
== HASH_ALGO_SHA1
)
863 if (bank_idx
== -1) {
864 pr_err("No suitable TPM algorithm for boot aggregate\n");
868 hash
->algo
= ima_tpm_chip
->allocated_banks
[bank_idx
].crypto_id
;
870 tfm
= ima_alloc_tfm(hash
->algo
);
874 hash
->length
= crypto_shash_digestsize(tfm
);
875 alg_id
= ima_tpm_chip
->allocated_banks
[bank_idx
].alg_id
;
876 rc
= ima_calc_boot_aggregate_tfm(hash
->digest
, alg_id
, tfm
);