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