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[mirror_ubuntu-jammy-kernel.git] / drivers / tee / tee_core.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015-2016, Linaro Limited
4 */
5
6 #define pr_fmt(fmt) "%s: " fmt, __func__
7
8 #include <linux/cdev.h>
9 #include <linux/cred.h>
10 #include <linux/fs.h>
11 #include <linux/idr.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/tee_drv.h>
15 #include <linux/uaccess.h>
16 #include <crypto/hash.h>
17 #include <crypto/sha1.h>
18 #include "tee_private.h"
19
20 #define TEE_NUM_DEVICES 32
21
22 #define TEE_IOCTL_PARAM_SIZE(x) (sizeof(struct tee_param) * (x))
23
24 #define TEE_UUID_NS_NAME_SIZE 128
25
26 /*
27 * TEE Client UUID name space identifier (UUIDv4)
28 *
29 * Value here is random UUID that is allocated as name space identifier for
30 * forming Client UUID's for TEE environment using UUIDv5 scheme.
31 */
32 static const uuid_t tee_client_uuid_ns = UUID_INIT(0x58ac9ca0, 0x2086, 0x4683,
33 0xa1, 0xb8, 0xec, 0x4b,
34 0xc0, 0x8e, 0x01, 0xb6);
35
36 /*
37 * Unprivileged devices in the lower half range and privileged devices in
38 * the upper half range.
39 */
40 static DECLARE_BITMAP(dev_mask, TEE_NUM_DEVICES);
41 static DEFINE_SPINLOCK(driver_lock);
42
43 static struct class *tee_class;
44 static dev_t tee_devt;
45
46 struct tee_context *teedev_open(struct tee_device *teedev)
47 {
48 int rc;
49 struct tee_context *ctx;
50
51 if (!tee_device_get(teedev))
52 return ERR_PTR(-EINVAL);
53
54 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
55 if (!ctx) {
56 rc = -ENOMEM;
57 goto err;
58 }
59
60 kref_init(&ctx->refcount);
61 ctx->teedev = teedev;
62 rc = teedev->desc->ops->open(ctx);
63 if (rc)
64 goto err;
65
66 return ctx;
67 err:
68 kfree(ctx);
69 tee_device_put(teedev);
70 return ERR_PTR(rc);
71
72 }
73 EXPORT_SYMBOL_GPL(teedev_open);
74
75 void teedev_ctx_get(struct tee_context *ctx)
76 {
77 if (ctx->releasing)
78 return;
79
80 kref_get(&ctx->refcount);
81 }
82
83 static void teedev_ctx_release(struct kref *ref)
84 {
85 struct tee_context *ctx = container_of(ref, struct tee_context,
86 refcount);
87 ctx->releasing = true;
88 ctx->teedev->desc->ops->release(ctx);
89 kfree(ctx);
90 }
91
92 void teedev_ctx_put(struct tee_context *ctx)
93 {
94 if (ctx->releasing)
95 return;
96
97 kref_put(&ctx->refcount, teedev_ctx_release);
98 }
99
100 void teedev_close_context(struct tee_context *ctx)
101 {
102 struct tee_device *teedev = ctx->teedev;
103
104 teedev_ctx_put(ctx);
105 tee_device_put(teedev);
106 }
107 EXPORT_SYMBOL_GPL(teedev_close_context);
108
109 static int tee_open(struct inode *inode, struct file *filp)
110 {
111 struct tee_context *ctx;
112
113 ctx = teedev_open(container_of(inode->i_cdev, struct tee_device, cdev));
114 if (IS_ERR(ctx))
115 return PTR_ERR(ctx);
116
117 /*
118 * Default user-space behaviour is to wait for tee-supplicant
119 * if not present for any requests in this context.
120 */
121 ctx->supp_nowait = false;
122 filp->private_data = ctx;
123 return 0;
124 }
125
126 static int tee_release(struct inode *inode, struct file *filp)
127 {
128 teedev_close_context(filp->private_data);
129 return 0;
130 }
131
132 /**
133 * uuid_v5() - Calculate UUIDv5
134 * @uuid: Resulting UUID
135 * @ns: Name space ID for UUIDv5 function
136 * @name: Name for UUIDv5 function
137 * @size: Size of name
138 *
139 * UUIDv5 is specific in RFC 4122.
140 *
141 * This implements section (for SHA-1):
142 * 4.3. Algorithm for Creating a Name-Based UUID
143 */
144 static int uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
145 size_t size)
146 {
147 unsigned char hash[SHA1_DIGEST_SIZE];
148 struct crypto_shash *shash = NULL;
149 struct shash_desc *desc = NULL;
150 int rc;
151
152 shash = crypto_alloc_shash("sha1", 0, 0);
153 if (IS_ERR(shash)) {
154 rc = PTR_ERR(shash);
155 pr_err("shash(sha1) allocation failed\n");
156 return rc;
157 }
158
159 desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(shash),
160 GFP_KERNEL);
161 if (!desc) {
162 rc = -ENOMEM;
163 goto out_free_shash;
164 }
165
166 desc->tfm = shash;
167
168 rc = crypto_shash_init(desc);
169 if (rc < 0)
170 goto out_free_desc;
171
172 rc = crypto_shash_update(desc, (const u8 *)ns, sizeof(*ns));
173 if (rc < 0)
174 goto out_free_desc;
175
176 rc = crypto_shash_update(desc, (const u8 *)name, size);
177 if (rc < 0)
178 goto out_free_desc;
179
180 rc = crypto_shash_final(desc, hash);
181 if (rc < 0)
182 goto out_free_desc;
183
184 memcpy(uuid->b, hash, UUID_SIZE);
185
186 /* Tag for version 5 */
187 uuid->b[6] = (hash[6] & 0x0F) | 0x50;
188 uuid->b[8] = (hash[8] & 0x3F) | 0x80;
189
190 out_free_desc:
191 kfree(desc);
192
193 out_free_shash:
194 crypto_free_shash(shash);
195 return rc;
196 }
197
198 int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
199 const u8 connection_data[TEE_IOCTL_UUID_LEN])
200 {
201 gid_t ns_grp = (gid_t)-1;
202 kgid_t grp = INVALID_GID;
203 char *name = NULL;
204 int name_len;
205 int rc;
206
207 if (connection_method == TEE_IOCTL_LOGIN_PUBLIC ||
208 connection_method == TEE_IOCTL_LOGIN_REE_KERNEL) {
209 /* Nil UUID to be passed to TEE environment */
210 uuid_copy(uuid, &uuid_null);
211 return 0;
212 }
213
214 /*
215 * In Linux environment client UUID is based on UUIDv5.
216 *
217 * Determine client UUID with following semantics for 'name':
218 *
219 * For TEEC_LOGIN_USER:
220 * uid=<uid>
221 *
222 * For TEEC_LOGIN_GROUP:
223 * gid=<gid>
224 *
225 */
226
227 name = kzalloc(TEE_UUID_NS_NAME_SIZE, GFP_KERNEL);
228 if (!name)
229 return -ENOMEM;
230
231 switch (connection_method) {
232 case TEE_IOCTL_LOGIN_USER:
233 name_len = snprintf(name, TEE_UUID_NS_NAME_SIZE, "uid=%x",
234 current_euid().val);
235 if (name_len >= TEE_UUID_NS_NAME_SIZE) {
236 rc = -E2BIG;
237 goto out_free_name;
238 }
239 break;
240
241 case TEE_IOCTL_LOGIN_GROUP:
242 memcpy(&ns_grp, connection_data, sizeof(gid_t));
243 grp = make_kgid(current_user_ns(), ns_grp);
244 if (!gid_valid(grp) || !in_egroup_p(grp)) {
245 rc = -EPERM;
246 goto out_free_name;
247 }
248
249 name_len = snprintf(name, TEE_UUID_NS_NAME_SIZE, "gid=%x",
250 grp.val);
251 if (name_len >= TEE_UUID_NS_NAME_SIZE) {
252 rc = -E2BIG;
253 goto out_free_name;
254 }
255 break;
256
257 default:
258 rc = -EINVAL;
259 goto out_free_name;
260 }
261
262 rc = uuid_v5(uuid, &tee_client_uuid_ns, name, name_len);
263 out_free_name:
264 kfree(name);
265
266 return rc;
267 }
268 EXPORT_SYMBOL_GPL(tee_session_calc_client_uuid);
269
270 static int tee_ioctl_version(struct tee_context *ctx,
271 struct tee_ioctl_version_data __user *uvers)
272 {
273 struct tee_ioctl_version_data vers;
274
275 ctx->teedev->desc->ops->get_version(ctx->teedev, &vers);
276
277 if (ctx->teedev->desc->flags & TEE_DESC_PRIVILEGED)
278 vers.gen_caps |= TEE_GEN_CAP_PRIVILEGED;
279
280 if (copy_to_user(uvers, &vers, sizeof(vers)))
281 return -EFAULT;
282
283 return 0;
284 }
285
286 static int tee_ioctl_shm_alloc(struct tee_context *ctx,
287 struct tee_ioctl_shm_alloc_data __user *udata)
288 {
289 long ret;
290 struct tee_ioctl_shm_alloc_data data;
291 struct tee_shm *shm;
292
293 if (copy_from_user(&data, udata, sizeof(data)))
294 return -EFAULT;
295
296 /* Currently no input flags are supported */
297 if (data.flags)
298 return -EINVAL;
299
300 shm = tee_shm_alloc(ctx, data.size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
301 if (IS_ERR(shm))
302 return PTR_ERR(shm);
303
304 data.id = shm->id;
305 data.flags = shm->flags;
306 data.size = shm->size;
307
308 if (copy_to_user(udata, &data, sizeof(data)))
309 ret = -EFAULT;
310 else
311 ret = tee_shm_get_fd(shm);
312
313 /*
314 * When user space closes the file descriptor the shared memory
315 * should be freed or if tee_shm_get_fd() failed then it will
316 * be freed immediately.
317 */
318 tee_shm_put(shm);
319 return ret;
320 }
321
322 static int
323 tee_ioctl_shm_register(struct tee_context *ctx,
324 struct tee_ioctl_shm_register_data __user *udata)
325 {
326 long ret;
327 struct tee_ioctl_shm_register_data data;
328 struct tee_shm *shm;
329
330 if (copy_from_user(&data, udata, sizeof(data)))
331 return -EFAULT;
332
333 /* Currently no input flags are supported */
334 if (data.flags)
335 return -EINVAL;
336
337 shm = tee_shm_register(ctx, data.addr, data.length,
338 TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED);
339 if (IS_ERR(shm))
340 return PTR_ERR(shm);
341
342 data.id = shm->id;
343 data.flags = shm->flags;
344 data.length = shm->size;
345
346 if (copy_to_user(udata, &data, sizeof(data)))
347 ret = -EFAULT;
348 else
349 ret = tee_shm_get_fd(shm);
350 /*
351 * When user space closes the file descriptor the shared memory
352 * should be freed or if tee_shm_get_fd() failed then it will
353 * be freed immediately.
354 */
355 tee_shm_put(shm);
356 return ret;
357 }
358
359 static int params_from_user(struct tee_context *ctx, struct tee_param *params,
360 size_t num_params,
361 struct tee_ioctl_param __user *uparams)
362 {
363 size_t n;
364
365 for (n = 0; n < num_params; n++) {
366 struct tee_shm *shm;
367 struct tee_ioctl_param ip;
368
369 if (copy_from_user(&ip, uparams + n, sizeof(ip)))
370 return -EFAULT;
371
372 /* All unused attribute bits has to be zero */
373 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
374 return -EINVAL;
375
376 params[n].attr = ip.attr;
377 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
378 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
379 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
380 break;
381 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
382 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
383 params[n].u.value.a = ip.a;
384 params[n].u.value.b = ip.b;
385 params[n].u.value.c = ip.c;
386 break;
387 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
388 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
389 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
390 /*
391 * If a NULL pointer is passed to a TA in the TEE,
392 * the ip.c IOCTL parameters is set to TEE_MEMREF_NULL
393 * indicating a NULL memory reference.
394 */
395 if (ip.c != TEE_MEMREF_NULL) {
396 /*
397 * If we fail to get a pointer to a shared
398 * memory object (and increase the ref count)
399 * from an identifier we return an error. All
400 * pointers that has been added in params have
401 * an increased ref count. It's the callers
402 * responibility to do tee_shm_put() on all
403 * resolved pointers.
404 */
405 shm = tee_shm_get_from_id(ctx, ip.c);
406 if (IS_ERR(shm))
407 return PTR_ERR(shm);
408
409 /*
410 * Ensure offset + size does not overflow
411 * offset and does not overflow the size of
412 * the referred shared memory object.
413 */
414 if ((ip.a + ip.b) < ip.a ||
415 (ip.a + ip.b) > shm->size) {
416 tee_shm_put(shm);
417 return -EINVAL;
418 }
419 } else if (ctx->cap_memref_null) {
420 /* Pass NULL pointer to OP-TEE */
421 shm = NULL;
422 } else {
423 return -EINVAL;
424 }
425
426 params[n].u.memref.shm_offs = ip.a;
427 params[n].u.memref.size = ip.b;
428 params[n].u.memref.shm = shm;
429 break;
430 default:
431 /* Unknown attribute */
432 return -EINVAL;
433 }
434 }
435 return 0;
436 }
437
438 static int params_to_user(struct tee_ioctl_param __user *uparams,
439 size_t num_params, struct tee_param *params)
440 {
441 size_t n;
442
443 for (n = 0; n < num_params; n++) {
444 struct tee_ioctl_param __user *up = uparams + n;
445 struct tee_param *p = params + n;
446
447 switch (p->attr) {
448 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
449 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
450 if (put_user(p->u.value.a, &up->a) ||
451 put_user(p->u.value.b, &up->b) ||
452 put_user(p->u.value.c, &up->c))
453 return -EFAULT;
454 break;
455 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
456 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
457 if (put_user((u64)p->u.memref.size, &up->b))
458 return -EFAULT;
459 break;
460 default:
461 break;
462 }
463 }
464 return 0;
465 }
466
467 static int tee_ioctl_open_session(struct tee_context *ctx,
468 struct tee_ioctl_buf_data __user *ubuf)
469 {
470 int rc;
471 size_t n;
472 struct tee_ioctl_buf_data buf;
473 struct tee_ioctl_open_session_arg __user *uarg;
474 struct tee_ioctl_open_session_arg arg;
475 struct tee_ioctl_param __user *uparams = NULL;
476 struct tee_param *params = NULL;
477 bool have_session = false;
478
479 if (!ctx->teedev->desc->ops->open_session)
480 return -EINVAL;
481
482 if (copy_from_user(&buf, ubuf, sizeof(buf)))
483 return -EFAULT;
484
485 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
486 buf.buf_len < sizeof(struct tee_ioctl_open_session_arg))
487 return -EINVAL;
488
489 uarg = u64_to_user_ptr(buf.buf_ptr);
490 if (copy_from_user(&arg, uarg, sizeof(arg)))
491 return -EFAULT;
492
493 if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
494 return -EINVAL;
495
496 if (arg.num_params) {
497 params = kcalloc(arg.num_params, sizeof(struct tee_param),
498 GFP_KERNEL);
499 if (!params)
500 return -ENOMEM;
501 uparams = uarg->params;
502 rc = params_from_user(ctx, params, arg.num_params, uparams);
503 if (rc)
504 goto out;
505 }
506
507 if (arg.clnt_login >= TEE_IOCTL_LOGIN_REE_KERNEL_MIN &&
508 arg.clnt_login <= TEE_IOCTL_LOGIN_REE_KERNEL_MAX) {
509 pr_debug("login method not allowed for user-space client\n");
510 rc = -EPERM;
511 goto out;
512 }
513
514 rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params);
515 if (rc)
516 goto out;
517 have_session = true;
518
519 if (put_user(arg.session, &uarg->session) ||
520 put_user(arg.ret, &uarg->ret) ||
521 put_user(arg.ret_origin, &uarg->ret_origin)) {
522 rc = -EFAULT;
523 goto out;
524 }
525 rc = params_to_user(uparams, arg.num_params, params);
526 out:
527 /*
528 * If we've succeeded to open the session but failed to communicate
529 * it back to user space, close the session again to avoid leakage.
530 */
531 if (rc && have_session && ctx->teedev->desc->ops->close_session)
532 ctx->teedev->desc->ops->close_session(ctx, arg.session);
533
534 if (params) {
535 /* Decrease ref count for all valid shared memory pointers */
536 for (n = 0; n < arg.num_params; n++)
537 if (tee_param_is_memref(params + n) &&
538 params[n].u.memref.shm)
539 tee_shm_put(params[n].u.memref.shm);
540 kfree(params);
541 }
542
543 return rc;
544 }
545
546 static int tee_ioctl_invoke(struct tee_context *ctx,
547 struct tee_ioctl_buf_data __user *ubuf)
548 {
549 int rc;
550 size_t n;
551 struct tee_ioctl_buf_data buf;
552 struct tee_ioctl_invoke_arg __user *uarg;
553 struct tee_ioctl_invoke_arg arg;
554 struct tee_ioctl_param __user *uparams = NULL;
555 struct tee_param *params = NULL;
556
557 if (!ctx->teedev->desc->ops->invoke_func)
558 return -EINVAL;
559
560 if (copy_from_user(&buf, ubuf, sizeof(buf)))
561 return -EFAULT;
562
563 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
564 buf.buf_len < sizeof(struct tee_ioctl_invoke_arg))
565 return -EINVAL;
566
567 uarg = u64_to_user_ptr(buf.buf_ptr);
568 if (copy_from_user(&arg, uarg, sizeof(arg)))
569 return -EFAULT;
570
571 if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
572 return -EINVAL;
573
574 if (arg.num_params) {
575 params = kcalloc(arg.num_params, sizeof(struct tee_param),
576 GFP_KERNEL);
577 if (!params)
578 return -ENOMEM;
579 uparams = uarg->params;
580 rc = params_from_user(ctx, params, arg.num_params, uparams);
581 if (rc)
582 goto out;
583 }
584
585 rc = ctx->teedev->desc->ops->invoke_func(ctx, &arg, params);
586 if (rc)
587 goto out;
588
589 if (put_user(arg.ret, &uarg->ret) ||
590 put_user(arg.ret_origin, &uarg->ret_origin)) {
591 rc = -EFAULT;
592 goto out;
593 }
594 rc = params_to_user(uparams, arg.num_params, params);
595 out:
596 if (params) {
597 /* Decrease ref count for all valid shared memory pointers */
598 for (n = 0; n < arg.num_params; n++)
599 if (tee_param_is_memref(params + n) &&
600 params[n].u.memref.shm)
601 tee_shm_put(params[n].u.memref.shm);
602 kfree(params);
603 }
604 return rc;
605 }
606
607 static int tee_ioctl_cancel(struct tee_context *ctx,
608 struct tee_ioctl_cancel_arg __user *uarg)
609 {
610 struct tee_ioctl_cancel_arg arg;
611
612 if (!ctx->teedev->desc->ops->cancel_req)
613 return -EINVAL;
614
615 if (copy_from_user(&arg, uarg, sizeof(arg)))
616 return -EFAULT;
617
618 return ctx->teedev->desc->ops->cancel_req(ctx, arg.cancel_id,
619 arg.session);
620 }
621
622 static int
623 tee_ioctl_close_session(struct tee_context *ctx,
624 struct tee_ioctl_close_session_arg __user *uarg)
625 {
626 struct tee_ioctl_close_session_arg arg;
627
628 if (!ctx->teedev->desc->ops->close_session)
629 return -EINVAL;
630
631 if (copy_from_user(&arg, uarg, sizeof(arg)))
632 return -EFAULT;
633
634 return ctx->teedev->desc->ops->close_session(ctx, arg.session);
635 }
636
637 static int params_to_supp(struct tee_context *ctx,
638 struct tee_ioctl_param __user *uparams,
639 size_t num_params, struct tee_param *params)
640 {
641 size_t n;
642
643 for (n = 0; n < num_params; n++) {
644 struct tee_ioctl_param ip;
645 struct tee_param *p = params + n;
646
647 ip.attr = p->attr;
648 switch (p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
649 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
650 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
651 ip.a = p->u.value.a;
652 ip.b = p->u.value.b;
653 ip.c = p->u.value.c;
654 break;
655 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
656 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
657 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
658 ip.b = p->u.memref.size;
659 if (!p->u.memref.shm) {
660 ip.a = 0;
661 ip.c = (u64)-1; /* invalid shm id */
662 break;
663 }
664 ip.a = p->u.memref.shm_offs;
665 ip.c = p->u.memref.shm->id;
666 break;
667 default:
668 ip.a = 0;
669 ip.b = 0;
670 ip.c = 0;
671 break;
672 }
673
674 if (copy_to_user(uparams + n, &ip, sizeof(ip)))
675 return -EFAULT;
676 }
677
678 return 0;
679 }
680
681 static int tee_ioctl_supp_recv(struct tee_context *ctx,
682 struct tee_ioctl_buf_data __user *ubuf)
683 {
684 int rc;
685 struct tee_ioctl_buf_data buf;
686 struct tee_iocl_supp_recv_arg __user *uarg;
687 struct tee_param *params;
688 u32 num_params;
689 u32 func;
690
691 if (!ctx->teedev->desc->ops->supp_recv)
692 return -EINVAL;
693
694 if (copy_from_user(&buf, ubuf, sizeof(buf)))
695 return -EFAULT;
696
697 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
698 buf.buf_len < sizeof(struct tee_iocl_supp_recv_arg))
699 return -EINVAL;
700
701 uarg = u64_to_user_ptr(buf.buf_ptr);
702 if (get_user(num_params, &uarg->num_params))
703 return -EFAULT;
704
705 if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) != buf.buf_len)
706 return -EINVAL;
707
708 params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
709 if (!params)
710 return -ENOMEM;
711
712 rc = params_from_user(ctx, params, num_params, uarg->params);
713 if (rc)
714 goto out;
715
716 rc = ctx->teedev->desc->ops->supp_recv(ctx, &func, &num_params, params);
717 if (rc)
718 goto out;
719
720 if (put_user(func, &uarg->func) ||
721 put_user(num_params, &uarg->num_params)) {
722 rc = -EFAULT;
723 goto out;
724 }
725
726 rc = params_to_supp(ctx, uarg->params, num_params, params);
727 out:
728 kfree(params);
729 return rc;
730 }
731
732 static int params_from_supp(struct tee_param *params, size_t num_params,
733 struct tee_ioctl_param __user *uparams)
734 {
735 size_t n;
736
737 for (n = 0; n < num_params; n++) {
738 struct tee_param *p = params + n;
739 struct tee_ioctl_param ip;
740
741 if (copy_from_user(&ip, uparams + n, sizeof(ip)))
742 return -EFAULT;
743
744 /* All unused attribute bits has to be zero */
745 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
746 return -EINVAL;
747
748 p->attr = ip.attr;
749 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
750 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
751 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
752 /* Only out and in/out values can be updated */
753 p->u.value.a = ip.a;
754 p->u.value.b = ip.b;
755 p->u.value.c = ip.c;
756 break;
757 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
758 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
759 /*
760 * Only the size of the memref can be updated.
761 * Since we don't have access to the original
762 * parameters here, only store the supplied size.
763 * The driver will copy the updated size into the
764 * original parameters.
765 */
766 p->u.memref.shm = NULL;
767 p->u.memref.shm_offs = 0;
768 p->u.memref.size = ip.b;
769 break;
770 default:
771 memset(&p->u, 0, sizeof(p->u));
772 break;
773 }
774 }
775 return 0;
776 }
777
778 static int tee_ioctl_supp_send(struct tee_context *ctx,
779 struct tee_ioctl_buf_data __user *ubuf)
780 {
781 long rc;
782 struct tee_ioctl_buf_data buf;
783 struct tee_iocl_supp_send_arg __user *uarg;
784 struct tee_param *params;
785 u32 num_params;
786 u32 ret;
787
788 /* Not valid for this driver */
789 if (!ctx->teedev->desc->ops->supp_send)
790 return -EINVAL;
791
792 if (copy_from_user(&buf, ubuf, sizeof(buf)))
793 return -EFAULT;
794
795 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
796 buf.buf_len < sizeof(struct tee_iocl_supp_send_arg))
797 return -EINVAL;
798
799 uarg = u64_to_user_ptr(buf.buf_ptr);
800 if (get_user(ret, &uarg->ret) ||
801 get_user(num_params, &uarg->num_params))
802 return -EFAULT;
803
804 if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) > buf.buf_len)
805 return -EINVAL;
806
807 params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
808 if (!params)
809 return -ENOMEM;
810
811 rc = params_from_supp(params, num_params, uarg->params);
812 if (rc)
813 goto out;
814
815 rc = ctx->teedev->desc->ops->supp_send(ctx, ret, num_params, params);
816 out:
817 kfree(params);
818 return rc;
819 }
820
821 static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
822 {
823 struct tee_context *ctx = filp->private_data;
824 void __user *uarg = (void __user *)arg;
825
826 switch (cmd) {
827 case TEE_IOC_VERSION:
828 return tee_ioctl_version(ctx, uarg);
829 case TEE_IOC_SHM_ALLOC:
830 return tee_ioctl_shm_alloc(ctx, uarg);
831 case TEE_IOC_SHM_REGISTER:
832 return tee_ioctl_shm_register(ctx, uarg);
833 case TEE_IOC_OPEN_SESSION:
834 return tee_ioctl_open_session(ctx, uarg);
835 case TEE_IOC_INVOKE:
836 return tee_ioctl_invoke(ctx, uarg);
837 case TEE_IOC_CANCEL:
838 return tee_ioctl_cancel(ctx, uarg);
839 case TEE_IOC_CLOSE_SESSION:
840 return tee_ioctl_close_session(ctx, uarg);
841 case TEE_IOC_SUPPL_RECV:
842 return tee_ioctl_supp_recv(ctx, uarg);
843 case TEE_IOC_SUPPL_SEND:
844 return tee_ioctl_supp_send(ctx, uarg);
845 default:
846 return -EINVAL;
847 }
848 }
849
850 static const struct file_operations tee_fops = {
851 .owner = THIS_MODULE,
852 .open = tee_open,
853 .release = tee_release,
854 .unlocked_ioctl = tee_ioctl,
855 .compat_ioctl = compat_ptr_ioctl,
856 };
857
858 static void tee_release_device(struct device *dev)
859 {
860 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
861
862 spin_lock(&driver_lock);
863 clear_bit(teedev->id, dev_mask);
864 spin_unlock(&driver_lock);
865 mutex_destroy(&teedev->mutex);
866 idr_destroy(&teedev->idr);
867 kfree(teedev);
868 }
869
870 /**
871 * tee_device_alloc() - Allocate a new struct tee_device instance
872 * @teedesc: Descriptor for this driver
873 * @dev: Parent device for this device
874 * @pool: Shared memory pool, NULL if not used
875 * @driver_data: Private driver data for this device
876 *
877 * Allocates a new struct tee_device instance. The device is
878 * removed by tee_device_unregister().
879 *
880 * @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
881 */
882 struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
883 struct device *dev,
884 struct tee_shm_pool *pool,
885 void *driver_data)
886 {
887 struct tee_device *teedev;
888 void *ret;
889 int rc, max_id;
890 int offs = 0;
891
892 if (!teedesc || !teedesc->name || !teedesc->ops ||
893 !teedesc->ops->get_version || !teedesc->ops->open ||
894 !teedesc->ops->release || !pool)
895 return ERR_PTR(-EINVAL);
896
897 teedev = kzalloc(sizeof(*teedev), GFP_KERNEL);
898 if (!teedev) {
899 ret = ERR_PTR(-ENOMEM);
900 goto err;
901 }
902
903 max_id = TEE_NUM_DEVICES / 2;
904
905 if (teedesc->flags & TEE_DESC_PRIVILEGED) {
906 offs = TEE_NUM_DEVICES / 2;
907 max_id = TEE_NUM_DEVICES;
908 }
909
910 spin_lock(&driver_lock);
911 teedev->id = find_next_zero_bit(dev_mask, max_id, offs);
912 if (teedev->id < max_id)
913 set_bit(teedev->id, dev_mask);
914 spin_unlock(&driver_lock);
915
916 if (teedev->id >= max_id) {
917 ret = ERR_PTR(-ENOMEM);
918 goto err;
919 }
920
921 snprintf(teedev->name, sizeof(teedev->name), "tee%s%d",
922 teedesc->flags & TEE_DESC_PRIVILEGED ? "priv" : "",
923 teedev->id - offs);
924
925 teedev->dev.class = tee_class;
926 teedev->dev.release = tee_release_device;
927 teedev->dev.parent = dev;
928
929 teedev->dev.devt = MKDEV(MAJOR(tee_devt), teedev->id);
930
931 rc = dev_set_name(&teedev->dev, "%s", teedev->name);
932 if (rc) {
933 ret = ERR_PTR(rc);
934 goto err_devt;
935 }
936
937 cdev_init(&teedev->cdev, &tee_fops);
938 teedev->cdev.owner = teedesc->owner;
939
940 dev_set_drvdata(&teedev->dev, driver_data);
941 device_initialize(&teedev->dev);
942
943 /* 1 as tee_device_unregister() does one final tee_device_put() */
944 teedev->num_users = 1;
945 init_completion(&teedev->c_no_users);
946 mutex_init(&teedev->mutex);
947 idr_init(&teedev->idr);
948
949 teedev->desc = teedesc;
950 teedev->pool = pool;
951
952 return teedev;
953 err_devt:
954 unregister_chrdev_region(teedev->dev.devt, 1);
955 err:
956 pr_err("could not register %s driver\n",
957 teedesc->flags & TEE_DESC_PRIVILEGED ? "privileged" : "client");
958 if (teedev && teedev->id < TEE_NUM_DEVICES) {
959 spin_lock(&driver_lock);
960 clear_bit(teedev->id, dev_mask);
961 spin_unlock(&driver_lock);
962 }
963 kfree(teedev);
964 return ret;
965 }
966 EXPORT_SYMBOL_GPL(tee_device_alloc);
967
968 static ssize_t implementation_id_show(struct device *dev,
969 struct device_attribute *attr, char *buf)
970 {
971 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
972 struct tee_ioctl_version_data vers;
973
974 teedev->desc->ops->get_version(teedev, &vers);
975 return scnprintf(buf, PAGE_SIZE, "%d\n", vers.impl_id);
976 }
977 static DEVICE_ATTR_RO(implementation_id);
978
979 static struct attribute *tee_dev_attrs[] = {
980 &dev_attr_implementation_id.attr,
981 NULL
982 };
983
984 ATTRIBUTE_GROUPS(tee_dev);
985
986 /**
987 * tee_device_register() - Registers a TEE device
988 * @teedev: Device to register
989 *
990 * tee_device_unregister() need to be called to remove the @teedev if
991 * this function fails.
992 *
993 * @returns < 0 on failure
994 */
995 int tee_device_register(struct tee_device *teedev)
996 {
997 int rc;
998
999 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
1000 dev_err(&teedev->dev, "attempt to register twice\n");
1001 return -EINVAL;
1002 }
1003
1004 teedev->dev.groups = tee_dev_groups;
1005
1006 rc = cdev_device_add(&teedev->cdev, &teedev->dev);
1007 if (rc) {
1008 dev_err(&teedev->dev,
1009 "unable to cdev_device_add() %s, major %d, minor %d, err=%d\n",
1010 teedev->name, MAJOR(teedev->dev.devt),
1011 MINOR(teedev->dev.devt), rc);
1012 return rc;
1013 }
1014
1015 teedev->flags |= TEE_DEVICE_FLAG_REGISTERED;
1016 return 0;
1017 }
1018 EXPORT_SYMBOL_GPL(tee_device_register);
1019
1020 void tee_device_put(struct tee_device *teedev)
1021 {
1022 mutex_lock(&teedev->mutex);
1023 /* Shouldn't put in this state */
1024 if (!WARN_ON(!teedev->desc)) {
1025 teedev->num_users--;
1026 if (!teedev->num_users) {
1027 teedev->desc = NULL;
1028 complete(&teedev->c_no_users);
1029 }
1030 }
1031 mutex_unlock(&teedev->mutex);
1032 }
1033
1034 bool tee_device_get(struct tee_device *teedev)
1035 {
1036 mutex_lock(&teedev->mutex);
1037 if (!teedev->desc) {
1038 mutex_unlock(&teedev->mutex);
1039 return false;
1040 }
1041 teedev->num_users++;
1042 mutex_unlock(&teedev->mutex);
1043 return true;
1044 }
1045
1046 /**
1047 * tee_device_unregister() - Removes a TEE device
1048 * @teedev: Device to unregister
1049 *
1050 * This function should be called to remove the @teedev even if
1051 * tee_device_register() hasn't been called yet. Does nothing if
1052 * @teedev is NULL.
1053 */
1054 void tee_device_unregister(struct tee_device *teedev)
1055 {
1056 if (!teedev)
1057 return;
1058
1059 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED)
1060 cdev_device_del(&teedev->cdev, &teedev->dev);
1061
1062 tee_device_put(teedev);
1063 wait_for_completion(&teedev->c_no_users);
1064
1065 /*
1066 * No need to take a mutex any longer now since teedev->desc was
1067 * set to NULL before teedev->c_no_users was completed.
1068 */
1069
1070 teedev->pool = NULL;
1071
1072 put_device(&teedev->dev);
1073 }
1074 EXPORT_SYMBOL_GPL(tee_device_unregister);
1075
1076 /**
1077 * tee_get_drvdata() - Return driver_data pointer
1078 * @teedev: Device containing the driver_data pointer
1079 * @returns the driver_data pointer supplied to tee_register().
1080 */
1081 void *tee_get_drvdata(struct tee_device *teedev)
1082 {
1083 return dev_get_drvdata(&teedev->dev);
1084 }
1085 EXPORT_SYMBOL_GPL(tee_get_drvdata);
1086
1087 struct match_dev_data {
1088 struct tee_ioctl_version_data *vers;
1089 const void *data;
1090 int (*match)(struct tee_ioctl_version_data *, const void *);
1091 };
1092
1093 static int match_dev(struct device *dev, const void *data)
1094 {
1095 const struct match_dev_data *match_data = data;
1096 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
1097
1098 teedev->desc->ops->get_version(teedev, match_data->vers);
1099 return match_data->match(match_data->vers, match_data->data);
1100 }
1101
1102 struct tee_context *
1103 tee_client_open_context(struct tee_context *start,
1104 int (*match)(struct tee_ioctl_version_data *,
1105 const void *),
1106 const void *data, struct tee_ioctl_version_data *vers)
1107 {
1108 struct device *dev = NULL;
1109 struct device *put_dev = NULL;
1110 struct tee_context *ctx = NULL;
1111 struct tee_ioctl_version_data v;
1112 struct match_dev_data match_data = { vers ? vers : &v, data, match };
1113
1114 if (start)
1115 dev = &start->teedev->dev;
1116
1117 do {
1118 dev = class_find_device(tee_class, dev, &match_data, match_dev);
1119 if (!dev) {
1120 ctx = ERR_PTR(-ENOENT);
1121 break;
1122 }
1123
1124 put_device(put_dev);
1125 put_dev = dev;
1126
1127 ctx = teedev_open(container_of(dev, struct tee_device, dev));
1128 } while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM);
1129
1130 put_device(put_dev);
1131 /*
1132 * Default behaviour for in kernel client is to not wait for
1133 * tee-supplicant if not present for any requests in this context.
1134 * Also this flag could be configured again before call to
1135 * tee_client_open_session() if any in kernel client requires
1136 * different behaviour.
1137 */
1138 if (!IS_ERR(ctx))
1139 ctx->supp_nowait = true;
1140
1141 return ctx;
1142 }
1143 EXPORT_SYMBOL_GPL(tee_client_open_context);
1144
1145 void tee_client_close_context(struct tee_context *ctx)
1146 {
1147 teedev_close_context(ctx);
1148 }
1149 EXPORT_SYMBOL_GPL(tee_client_close_context);
1150
1151 void tee_client_get_version(struct tee_context *ctx,
1152 struct tee_ioctl_version_data *vers)
1153 {
1154 ctx->teedev->desc->ops->get_version(ctx->teedev, vers);
1155 }
1156 EXPORT_SYMBOL_GPL(tee_client_get_version);
1157
1158 int tee_client_open_session(struct tee_context *ctx,
1159 struct tee_ioctl_open_session_arg *arg,
1160 struct tee_param *param)
1161 {
1162 if (!ctx->teedev->desc->ops->open_session)
1163 return -EINVAL;
1164 return ctx->teedev->desc->ops->open_session(ctx, arg, param);
1165 }
1166 EXPORT_SYMBOL_GPL(tee_client_open_session);
1167
1168 int tee_client_close_session(struct tee_context *ctx, u32 session)
1169 {
1170 if (!ctx->teedev->desc->ops->close_session)
1171 return -EINVAL;
1172 return ctx->teedev->desc->ops->close_session(ctx, session);
1173 }
1174 EXPORT_SYMBOL_GPL(tee_client_close_session);
1175
1176 int tee_client_invoke_func(struct tee_context *ctx,
1177 struct tee_ioctl_invoke_arg *arg,
1178 struct tee_param *param)
1179 {
1180 if (!ctx->teedev->desc->ops->invoke_func)
1181 return -EINVAL;
1182 return ctx->teedev->desc->ops->invoke_func(ctx, arg, param);
1183 }
1184 EXPORT_SYMBOL_GPL(tee_client_invoke_func);
1185
1186 int tee_client_cancel_req(struct tee_context *ctx,
1187 struct tee_ioctl_cancel_arg *arg)
1188 {
1189 if (!ctx->teedev->desc->ops->cancel_req)
1190 return -EINVAL;
1191 return ctx->teedev->desc->ops->cancel_req(ctx, arg->cancel_id,
1192 arg->session);
1193 }
1194
1195 static int tee_client_device_match(struct device *dev,
1196 struct device_driver *drv)
1197 {
1198 const struct tee_client_device_id *id_table;
1199 struct tee_client_device *tee_device;
1200
1201 id_table = to_tee_client_driver(drv)->id_table;
1202 tee_device = to_tee_client_device(dev);
1203
1204 while (!uuid_is_null(&id_table->uuid)) {
1205 if (uuid_equal(&tee_device->id.uuid, &id_table->uuid))
1206 return 1;
1207 id_table++;
1208 }
1209
1210 return 0;
1211 }
1212
1213 static int tee_client_device_uevent(struct device *dev,
1214 struct kobj_uevent_env *env)
1215 {
1216 uuid_t *dev_id = &to_tee_client_device(dev)->id.uuid;
1217
1218 return add_uevent_var(env, "MODALIAS=tee:%pUb", dev_id);
1219 }
1220
1221 struct bus_type tee_bus_type = {
1222 .name = "tee",
1223 .match = tee_client_device_match,
1224 .uevent = tee_client_device_uevent,
1225 };
1226 EXPORT_SYMBOL_GPL(tee_bus_type);
1227
1228 static int __init tee_init(void)
1229 {
1230 int rc;
1231
1232 tee_class = class_create(THIS_MODULE, "tee");
1233 if (IS_ERR(tee_class)) {
1234 pr_err("couldn't create class\n");
1235 return PTR_ERR(tee_class);
1236 }
1237
1238 rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee");
1239 if (rc) {
1240 pr_err("failed to allocate char dev region\n");
1241 goto out_unreg_class;
1242 }
1243
1244 rc = bus_register(&tee_bus_type);
1245 if (rc) {
1246 pr_err("failed to register tee bus\n");
1247 goto out_unreg_chrdev;
1248 }
1249
1250 return 0;
1251
1252 out_unreg_chrdev:
1253 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
1254 out_unreg_class:
1255 class_destroy(tee_class);
1256 tee_class = NULL;
1257
1258 return rc;
1259 }
1260
1261 static void __exit tee_exit(void)
1262 {
1263 bus_unregister(&tee_bus_type);
1264 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
1265 class_destroy(tee_class);
1266 tee_class = NULL;
1267 }
1268
1269 subsys_initcall(tee_init);
1270 module_exit(tee_exit);
1271
1272 MODULE_AUTHOR("Linaro");
1273 MODULE_DESCRIPTION("TEE Driver");
1274 MODULE_VERSION("1.0");
1275 MODULE_LICENSE("GPL v2");
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