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Merge tag 'driver-core-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / drivers / tee / tee_core.c
CommitLineData
9c92ab61 1// SPDX-License-Identifier: GPL-2.0-only
967c9cca
JW		 2/*
3 * Copyright (c) 2015-2016, Linaro Limited
967c9cca
JW		 4 */
5
6#define pr_fmt(fmt) "%s: " fmt, __func__
7
8#include <linux/cdev.h>
e33bcbab 9#include <linux/cred.h>
967c9cca
JW		 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>
e33bcbab 16#include <crypto/hash.h>
a24d22b2 17#include <crypto/sha1.h>
967c9cca
JW		 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
e33bcbab
VJ		 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
967c9cca
JW		 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
25559c22 46static struct tee_context *teedev_open(struct tee_device *teedev)
967c9cca
JW		 47{
48 int rc;
967c9cca
JW		 49 struct tee_context *ctx;
50
967c9cca 51 if (!tee_device_get(teedev))
25559c22 52 return ERR_PTR(-EINVAL);
967c9cca
JW		 53
54 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
55 if (!ctx) {
56 rc = -ENOMEM;
57 goto err;
58 }
59
217e0250 60 kref_init(&ctx->refcount);
967c9cca 61 ctx->teedev = teedev;
967c9cca
JW		 62 rc = teedev->desc->ops->open(ctx);
63 if (rc)
64 goto err;
65
25559c22 66 return ctx;
967c9cca
JW		 67err:
68 kfree(ctx);
69 tee_device_put(teedev);
25559c22
JW		 70 return ERR_PTR(rc);
71
967c9cca
JW		 72}
73
217e0250 74void teedev_ctx_get(struct tee_context *ctx)
967c9cca 75{
217e0250
VB		 76 if (ctx->releasing)
77 return;
967c9cca 78
217e0250
VB		 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;
967c9cca 87 ctx->teedev->desc->ops->release(ctx);
967c9cca 88 kfree(ctx);
217e0250
VB		 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
25559c22
JW		 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
42bf4152
SG		 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;
25559c22
JW		 118 filp->private_data = ctx;
119 return 0;
120}
121
217e0250
VB		 122static int tee_release(struct inode *inode, struct file *filp)
123{
124 teedev_close_context(filp->private_data);
967c9cca
JW		 125 return 0;
126}
127
e33bcbab
VJ		 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
72293952
SG		 203 if (connection_method == TEE_IOCTL_LOGIN_PUBLIC ||
204 connection_method == TEE_IOCTL_LOGIN_REE_KERNEL) {
e33bcbab
VJ		 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
967c9cca
JW		 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);
059cf566
JW		 272
273 if (ctx->teedev->desc->flags & TEE_DESC_PRIVILEGED)
274 vers.gen_caps |= TEE_GEN_CAP_PRIVILEGED;
275
967c9cca
JW		 276 if (copy_to_user(uvers, &vers, sizeof(vers)))
277 return -EFAULT;
059cf566 278
967c9cca
JW		 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
967c9cca
JW		 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
033ddf12
JW		 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
967c9cca
JW		 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 */
f2aa9724 369 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
967c9cca
JW		 370 return -EINVAL;
371
372 params[n].attr = ip.attr;
f2aa9724 373 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
967c9cca
JW		 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 /*
ba171d3f
CN		 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.
967c9cca 390 */
ba171d3f
CN		 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 {
ab9d3db5
EC		 419 return -EINVAL;
420 }
421
967c9cca
JW		 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 default:
456 break;
457 }
458 }
459 return 0;
460}
461
967c9cca
JW		 462static int tee_ioctl_open_session(struct tee_context *ctx,
463 struct tee_ioctl_buf_data __user *ubuf)
464{
465 int rc;
466 size_t n;
467 struct tee_ioctl_buf_data buf;
468 struct tee_ioctl_open_session_arg __user *uarg;
469 struct tee_ioctl_open_session_arg arg;
470 struct tee_ioctl_param __user *uparams = NULL;
471 struct tee_param *params = NULL;
472 bool have_session = false;
473
474 if (!ctx->teedev->desc->ops->open_session)
475 return -EINVAL;
476
477 if (copy_from_user(&buf, ubuf, sizeof(buf)))
478 return -EFAULT;
479
480 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
481 buf.buf_len < sizeof(struct tee_ioctl_open_session_arg))
482 return -EINVAL;
483
484 uarg = u64_to_user_ptr(buf.buf_ptr);
485 if (copy_from_user(&arg, uarg, sizeof(arg)))
486 return -EFAULT;
487
488 if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
489 return -EINVAL;
490
491 if (arg.num_params) {
492 params = kcalloc(arg.num_params, sizeof(struct tee_param),
493 GFP_KERNEL);
494 if (!params)
495 return -ENOMEM;
496 uparams = uarg->params;
497 rc = params_from_user(ctx, params, arg.num_params, uparams);
498 if (rc)
499 goto out;
500 }
501
104edb94
SG		 502 if (arg.clnt_login >= TEE_IOCTL_LOGIN_REE_KERNEL_MIN &&
503 arg.clnt_login <= TEE_IOCTL_LOGIN_REE_KERNEL_MAX) {
504 pr_debug("login method not allowed for user-space client\n");
505 rc = -EPERM;
506 goto out;
507 }
508
967c9cca
JW		 509 rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params);
510 if (rc)
511 goto out;
512 have_session = true;
513
514 if (put_user(arg.session, &uarg->session) ||
515 put_user(arg.ret, &uarg->ret) ||
516 put_user(arg.ret_origin, &uarg->ret_origin)) {
517 rc = -EFAULT;
518 goto out;
519 }
520 rc = params_to_user(uparams, arg.num_params, params);
521out:
522 /*
523 * If we've succeeded to open the session but failed to communicate
524 * it back to user space, close the session again to avoid leakage.
525 */
526 if (rc && have_session && ctx->teedev->desc->ops->close_session)
527 ctx->teedev->desc->ops->close_session(ctx, arg.session);
528
529 if (params) {
530 /* Decrease ref count for all valid shared memory pointers */
531 for (n = 0; n < arg.num_params; n++)
84debcc5 532 if (tee_param_is_memref(params + n) &&
967c9cca
JW		 533 params[n].u.memref.shm)
534 tee_shm_put(params[n].u.memref.shm);
535 kfree(params);
536 }
537
538 return rc;
539}
540
541static int tee_ioctl_invoke(struct tee_context *ctx,
542 struct tee_ioctl_buf_data __user *ubuf)
543{
544 int rc;
545 size_t n;
546 struct tee_ioctl_buf_data buf;
547 struct tee_ioctl_invoke_arg __user *uarg;
548 struct tee_ioctl_invoke_arg arg;
549 struct tee_ioctl_param __user *uparams = NULL;
550 struct tee_param *params = NULL;
551
552 if (!ctx->teedev->desc->ops->invoke_func)
553 return -EINVAL;
554
555 if (copy_from_user(&buf, ubuf, sizeof(buf)))
556 return -EFAULT;
557
558 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
559 buf.buf_len < sizeof(struct tee_ioctl_invoke_arg))
560 return -EINVAL;
561
562 uarg = u64_to_user_ptr(buf.buf_ptr);
563 if (copy_from_user(&arg, uarg, sizeof(arg)))
564 return -EFAULT;
565
566 if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
567 return -EINVAL;
568
569 if (arg.num_params) {
570 params = kcalloc(arg.num_params, sizeof(struct tee_param),
571 GFP_KERNEL);
572 if (!params)
573 return -ENOMEM;
574 uparams = uarg->params;
575 rc = params_from_user(ctx, params, arg.num_params, uparams);
576 if (rc)
577 goto out;
578 }
579
580 rc = ctx->teedev->desc->ops->invoke_func(ctx, &arg, params);
581 if (rc)
582 goto out;
583
584 if (put_user(arg.ret, &uarg->ret) ||
585 put_user(arg.ret_origin, &uarg->ret_origin)) {
586 rc = -EFAULT;
587 goto out;
588 }
589 rc = params_to_user(uparams, arg.num_params, params);
590out:
591 if (params) {
592 /* Decrease ref count for all valid shared memory pointers */
593 for (n = 0; n < arg.num_params; n++)
84debcc5 594 if (tee_param_is_memref(params + n) &&
967c9cca
JW		 595 params[n].u.memref.shm)
596 tee_shm_put(params[n].u.memref.shm);
597 kfree(params);
598 }
599 return rc;
600}
601
602static int tee_ioctl_cancel(struct tee_context *ctx,
603 struct tee_ioctl_cancel_arg __user *uarg)
604{
605 struct tee_ioctl_cancel_arg arg;
606
607 if (!ctx->teedev->desc->ops->cancel_req)
608 return -EINVAL;
609
610 if (copy_from_user(&arg, uarg, sizeof(arg)))
611 return -EFAULT;
612
613 return ctx->teedev->desc->ops->cancel_req(ctx, arg.cancel_id,
614 arg.session);
615}
616
617static int
618tee_ioctl_close_session(struct tee_context *ctx,
619 struct tee_ioctl_close_session_arg __user *uarg)
620{
621 struct tee_ioctl_close_session_arg arg;
622
623 if (!ctx->teedev->desc->ops->close_session)
624 return -EINVAL;
625
626 if (copy_from_user(&arg, uarg, sizeof(arg)))
627 return -EFAULT;
628
629 return ctx->teedev->desc->ops->close_session(ctx, arg.session);
630}
631
632static int params_to_supp(struct tee_context *ctx,
633 struct tee_ioctl_param __user *uparams,
634 size_t num_params, struct tee_param *params)
635{
636 size_t n;
637
638 for (n = 0; n < num_params; n++) {
639 struct tee_ioctl_param ip;
640 struct tee_param *p = params + n;
641
f2aa9724
JW		 642 ip.attr = p->attr;
643 switch (p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
967c9cca
JW		 644 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
645 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
646 ip.a = p->u.value.a;
647 ip.b = p->u.value.b;
648 ip.c = p->u.value.c;
649 break;
650 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
651 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
652 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
653 ip.b = p->u.memref.size;
654 if (!p->u.memref.shm) {
655 ip.a = 0;
656 ip.c = (u64)-1; /* invalid shm id */
657 break;
658 }
659 ip.a = p->u.memref.shm_offs;
660 ip.c = p->u.memref.shm->id;
661 break;
662 default:
663 ip.a = 0;
664 ip.b = 0;
665 ip.c = 0;
666 break;
667 }
668
669 if (copy_to_user(uparams + n, &ip, sizeof(ip)))
670 return -EFAULT;
671 }
672
673 return 0;
674}
675
676static int tee_ioctl_supp_recv(struct tee_context *ctx,
677 struct tee_ioctl_buf_data __user *ubuf)
678{
679 int rc;
680 struct tee_ioctl_buf_data buf;
681 struct tee_iocl_supp_recv_arg __user *uarg;
682 struct tee_param *params;
683 u32 num_params;
684 u32 func;
685
686 if (!ctx->teedev->desc->ops->supp_recv)
687 return -EINVAL;
688
689 if (copy_from_user(&buf, ubuf, sizeof(buf)))
690 return -EFAULT;
691
692 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
693 buf.buf_len < sizeof(struct tee_iocl_supp_recv_arg))
694 return -EINVAL;
695
696 uarg = u64_to_user_ptr(buf.buf_ptr);
697 if (get_user(num_params, &uarg->num_params))
698 return -EFAULT;
699
700 if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) != buf.buf_len)
701 return -EINVAL;
702
703 params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
704 if (!params)
705 return -ENOMEM;
706
f2aa9724
JW		 707 rc = params_from_user(ctx, params, num_params, uarg->params);
708 if (rc)
709 goto out;
710
967c9cca
JW		 711 rc = ctx->teedev->desc->ops->supp_recv(ctx, &func, &num_params, params);
712 if (rc)
713 goto out;
714
715 if (put_user(func, &uarg->func) ||
716 put_user(num_params, &uarg->num_params)) {
717 rc = -EFAULT;
718 goto out;
719 }
720
721 rc = params_to_supp(ctx, uarg->params, num_params, params);
722out:
723 kfree(params);
724 return rc;
725}
726
727static int params_from_supp(struct tee_param *params, size_t num_params,
728 struct tee_ioctl_param __user *uparams)
729{
730 size_t n;
731
732 for (n = 0; n < num_params; n++) {
733 struct tee_param *p = params + n;
734 struct tee_ioctl_param ip;
735
736 if (copy_from_user(&ip, uparams + n, sizeof(ip)))
737 return -EFAULT;
738
739 /* All unused attribute bits has to be zero */
f2aa9724 740 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
967c9cca
JW		 741 return -EINVAL;
742
743 p->attr = ip.attr;
f2aa9724 744 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
967c9cca
JW		 745 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
746 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
747 /* Only out and in/out values can be updated */
748 p->u.value.a = ip.a;
749 p->u.value.b = ip.b;
750 p->u.value.c = ip.c;
751 break;
752 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
753 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
754 /*
755 * Only the size of the memref can be updated.
756 * Since we don't have access to the original
757 * parameters here, only store the supplied size.
758 * The driver will copy the updated size into the
759 * original parameters.
760 */
761 p->u.memref.shm = NULL;
762 p->u.memref.shm_offs = 0;
763 p->u.memref.size = ip.b;
764 break;
765 default:
766 memset(&p->u, 0, sizeof(p->u));
767 break;
768 }
769 }
770 return 0;
771}
772
773static int tee_ioctl_supp_send(struct tee_context *ctx,
774 struct tee_ioctl_buf_data __user *ubuf)
775{
776 long rc;
777 struct tee_ioctl_buf_data buf;
778 struct tee_iocl_supp_send_arg __user *uarg;
779 struct tee_param *params;
780 u32 num_params;
781 u32 ret;
782
783 /* Not valid for this driver */
784 if (!ctx->teedev->desc->ops->supp_send)
785 return -EINVAL;
786
787 if (copy_from_user(&buf, ubuf, sizeof(buf)))
788 return -EFAULT;
789
790 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
791 buf.buf_len < sizeof(struct tee_iocl_supp_send_arg))
792 return -EINVAL;
793
794 uarg = u64_to_user_ptr(buf.buf_ptr);
795 if (get_user(ret, &uarg->ret) ||
796 get_user(num_params, &uarg->num_params))
797 return -EFAULT;
798
799 if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) > buf.buf_len)
800 return -EINVAL;
801
802 params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
803 if (!params)
804 return -ENOMEM;
805
806 rc = params_from_supp(params, num_params, uarg->params);
807 if (rc)
808 goto out;
809
810 rc = ctx->teedev->desc->ops->supp_send(ctx, ret, num_params, params);
811out:
812 kfree(params);
813 return rc;
814}
815
816static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
817{
818 struct tee_context *ctx = filp->private_data;
819 void __user *uarg = (void __user *)arg;
820
821 switch (cmd) {
822 case TEE_IOC_VERSION:
823 return tee_ioctl_version(ctx, uarg);
824 case TEE_IOC_SHM_ALLOC:
825 return tee_ioctl_shm_alloc(ctx, uarg);
033ddf12
JW		 826 case TEE_IOC_SHM_REGISTER:
827 return tee_ioctl_shm_register(ctx, uarg);
967c9cca
JW		 828 case TEE_IOC_OPEN_SESSION:
829 return tee_ioctl_open_session(ctx, uarg);
830 case TEE_IOC_INVOKE:
831 return tee_ioctl_invoke(ctx, uarg);
832 case TEE_IOC_CANCEL:
833 return tee_ioctl_cancel(ctx, uarg);
834 case TEE_IOC_CLOSE_SESSION:
835 return tee_ioctl_close_session(ctx, uarg);
836 case TEE_IOC_SUPPL_RECV:
837 return tee_ioctl_supp_recv(ctx, uarg);
838 case TEE_IOC_SUPPL_SEND:
839 return tee_ioctl_supp_send(ctx, uarg);
840 default:
841 return -EINVAL;
842 }
843}
844
845static const struct file_operations tee_fops = {
846 .owner = THIS_MODULE,
847 .open = tee_open,
848 .release = tee_release,
849 .unlocked_ioctl = tee_ioctl,
1832f2d8 850 .compat_ioctl = compat_ptr_ioctl,
967c9cca
JW		 851};
852
853static void tee_release_device(struct device *dev)
854{
855 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
856
857 spin_lock(&driver_lock);
858 clear_bit(teedev->id, dev_mask);
859 spin_unlock(&driver_lock);
860 mutex_destroy(&teedev->mutex);
861 idr_destroy(&teedev->idr);
862 kfree(teedev);
863}
864
865/**
866 * tee_device_alloc() - Allocate a new struct tee_device instance
867 * @teedesc: Descriptor for this driver
868 * @dev: Parent device for this device
869 * @pool: Shared memory pool, NULL if not used
870 * @driver_data: Private driver data for this device
871 *
872 * Allocates a new struct tee_device instance. The device is
873 * removed by tee_device_unregister().
874 *
875 * @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
876 */
877struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
878 struct device *dev,
879 struct tee_shm_pool *pool,
880 void *driver_data)
881{
882 struct tee_device *teedev;
883 void *ret;
7dd003ae 884 int rc, max_id;
967c9cca
JW		 885 int offs = 0;
886
887 if (!teedesc || !teedesc->name || !teedesc->ops ||
888 !teedesc->ops->get_version || !teedesc->ops->open ||
889 !teedesc->ops->release || !pool)
890 return ERR_PTR(-EINVAL);
891
892 teedev = kzalloc(sizeof(*teedev), GFP_KERNEL);
893 if (!teedev) {
894 ret = ERR_PTR(-ENOMEM);
895 goto err;
896 }
897
7dd003ae
PF		 898 max_id = TEE_NUM_DEVICES / 2;
899
900 if (teedesc->flags & TEE_DESC_PRIVILEGED) {
967c9cca 901 offs = TEE_NUM_DEVICES / 2;
7dd003ae
PF		 902 max_id = TEE_NUM_DEVICES;
903 }
967c9cca
JW		 904
905 spin_lock(&driver_lock);
7dd003ae
PF		 906 teedev->id = find_next_zero_bit(dev_mask, max_id, offs);
907 if (teedev->id < max_id)
967c9cca
JW		 908 set_bit(teedev->id, dev_mask);
909 spin_unlock(&driver_lock);
910
7dd003ae 911 if (teedev->id >= max_id) {
967c9cca
JW		 912 ret = ERR_PTR(-ENOMEM);
913 goto err;
914 }
915
916 snprintf(teedev->name, sizeof(teedev->name), "tee%s%d",
917 teedesc->flags & TEE_DESC_PRIVILEGED ? "priv" : "",
918 teedev->id - offs);
919
920 teedev->dev.class = tee_class;
921 teedev->dev.release = tee_release_device;
922 teedev->dev.parent = dev;
923
924 teedev->dev.devt = MKDEV(MAJOR(tee_devt), teedev->id);
925
926 rc = dev_set_name(&teedev->dev, "%s", teedev->name);
927 if (rc) {
928 ret = ERR_PTR(rc);
929 goto err_devt;
930 }
931
932 cdev_init(&teedev->cdev, &tee_fops);
933 teedev->cdev.owner = teedesc->owner;
967c9cca
JW		 934
935 dev_set_drvdata(&teedev->dev, driver_data);
936 device_initialize(&teedev->dev);
937
938 /* 1 as tee_device_unregister() does one final tee_device_put() */
939 teedev->num_users = 1;
940 init_completion(&teedev->c_no_users);
941 mutex_init(&teedev->mutex);
942 idr_init(&teedev->idr);
943
944 teedev->desc = teedesc;
945 teedev->pool = pool;
946
947 return teedev;
948err_devt:
949 unregister_chrdev_region(teedev->dev.devt, 1);
950err:
951 pr_err("could not register %s driver\n",
952 teedesc->flags & TEE_DESC_PRIVILEGED ? "privileged" : "client");
953 if (teedev && teedev->id < TEE_NUM_DEVICES) {
954 spin_lock(&driver_lock);
955 clear_bit(teedev->id, dev_mask);
956 spin_unlock(&driver_lock);
957 }
958 kfree(teedev);
959 return ret;
960}
961EXPORT_SYMBOL_GPL(tee_device_alloc);
962
963static ssize_t implementation_id_show(struct device *dev,
964 struct device_attribute *attr, char *buf)
965{
966 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
967 struct tee_ioctl_version_data vers;
968
969 teedev->desc->ops->get_version(teedev, &vers);
970 return scnprintf(buf, PAGE_SIZE, "%d\n", vers.impl_id);
971}
972static DEVICE_ATTR_RO(implementation_id);
973
974static struct attribute *tee_dev_attrs[] = {
975 &dev_attr_implementation_id.attr,
976 NULL
977};
978
8c05f50f 979ATTRIBUTE_GROUPS(tee_dev);
967c9cca
JW		 980
981/**
982 * tee_device_register() - Registers a TEE device
983 * @teedev: Device to register
984 *
985 * tee_device_unregister() need to be called to remove the @teedev if
986 * this function fails.
987 *
988 * @returns < 0 on failure
989 */
990int tee_device_register(struct tee_device *teedev)
991{
992 int rc;
993
994 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
995 dev_err(&teedev->dev, "attempt to register twice\n");
996 return -EINVAL;
997 }
998
8c05f50f 999 teedev->dev.groups = tee_dev_groups;
967c9cca 1000
ab3d8e1b 1001 rc = cdev_device_add(&teedev->cdev, &teedev->dev);
967c9cca
JW		 1002 if (rc) {
1003 dev_err(&teedev->dev,
ab3d8e1b 1004 "unable to cdev_device_add() %s, major %d, minor %d, err=%d\n",
967c9cca
JW		 1005 teedev->name, MAJOR(teedev->dev.devt),
1006 MINOR(teedev->dev.devt), rc);
967c9cca 1007 return rc;
967c9cca
JW		 1008 }
1009
1010 teedev->flags |= TEE_DEVICE_FLAG_REGISTERED;
1011 return 0;
967c9cca
JW		 1012}
1013EXPORT_SYMBOL_GPL(tee_device_register);
1014
1015void tee_device_put(struct tee_device *teedev)
1016{
1017 mutex_lock(&teedev->mutex);
1018 /* Shouldn't put in this state */
1019 if (!WARN_ON(!teedev->desc)) {
1020 teedev->num_users--;
1021 if (!teedev->num_users) {
1022 teedev->desc = NULL;
1023 complete(&teedev->c_no_users);
1024 }
1025 }
1026 mutex_unlock(&teedev->mutex);
1027}
1028
1029bool tee_device_get(struct tee_device *teedev)
1030{
1031 mutex_lock(&teedev->mutex);
1032 if (!teedev->desc) {
1033 mutex_unlock(&teedev->mutex);
1034 return false;
1035 }
1036 teedev->num_users++;
1037 mutex_unlock(&teedev->mutex);
1038 return true;
1039}
1040
1041/**
1042 * tee_device_unregister() - Removes a TEE device
1043 * @teedev: Device to unregister
1044 *
1045 * This function should be called to remove the @teedev even if
1046 * tee_device_register() hasn't been called yet. Does nothing if
1047 * @teedev is NULL.
1048 */
1049void tee_device_unregister(struct tee_device *teedev)
1050{
1051 if (!teedev)
1052 return;
1053
8c05f50f 1054 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED)
ab3d8e1b 1055 cdev_device_del(&teedev->cdev, &teedev->dev);
967c9cca
JW		 1056
1057 tee_device_put(teedev);
1058 wait_for_completion(&teedev->c_no_users);
1059
1060 /*
1061 * No need to take a mutex any longer now since teedev->desc was
1062 * set to NULL before teedev->c_no_users was completed.
1063 */
1064
1065 teedev->pool = NULL;
1066
1067 put_device(&teedev->dev);
1068}
1069EXPORT_SYMBOL_GPL(tee_device_unregister);
1070
1071/**
1072 * tee_get_drvdata() - Return driver_data pointer
1073 * @teedev: Device containing the driver_data pointer
1074 * @returns the driver_data pointer supplied to tee_register().
1075 */
1076void *tee_get_drvdata(struct tee_device *teedev)
1077{
1078 return dev_get_drvdata(&teedev->dev);
1079}
1080EXPORT_SYMBOL_GPL(tee_get_drvdata);
1081
25559c22
JW		 1082struct match_dev_data {
1083 struct tee_ioctl_version_data *vers;
1084 const void *data;
1085 int (*match)(struct tee_ioctl_version_data *, const void *);
1086};
1087
1088static int match_dev(struct device *dev, const void *data)
1089{
1090 const struct match_dev_data *match_data = data;
1091 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
1092
1093 teedev->desc->ops->get_version(teedev, match_data->vers);
1094 return match_data->match(match_data->vers, match_data->data);
1095}
1096
1097struct tee_context *
1098tee_client_open_context(struct tee_context *start,
1099 int (*match)(struct tee_ioctl_version_data *,
1100 const void *),
1101 const void *data, struct tee_ioctl_version_data *vers)
1102{
1103 struct device *dev = NULL;
1104 struct device *put_dev = NULL;
1105 struct tee_context *ctx = NULL;
1106 struct tee_ioctl_version_data v;
1107 struct match_dev_data match_data = { vers ? vers : &v, data, match };
1108
1109 if (start)
1110 dev = &start->teedev->dev;
1111
1112 do {
1113 dev = class_find_device(tee_class, dev, &match_data, match_dev);
1114 if (!dev) {
1115 ctx = ERR_PTR(-ENOENT);
1116 break;
1117 }
1118
1119 put_device(put_dev);
1120 put_dev = dev;
1121
1122 ctx = teedev_open(container_of(dev, struct tee_device, dev));
1123 } while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM);
1124
1125 put_device(put_dev);
42bf4152
SG		 1126 /*
1127 * Default behaviour for in kernel client is to not wait for
1128 * tee-supplicant if not present for any requests in this context.
1129 * Also this flag could be configured again before call to
1130 * tee_client_open_session() if any in kernel client requires
1131 * different behaviour.
1132 */
bb342f01
SG		 1133 if (!IS_ERR(ctx))
1134 ctx->supp_nowait = true;
1135
25559c22
JW		 1136 return ctx;
1137}
1138EXPORT_SYMBOL_GPL(tee_client_open_context);
1139
1140void tee_client_close_context(struct tee_context *ctx)
1141{
1142 teedev_close_context(ctx);
1143}
1144EXPORT_SYMBOL_GPL(tee_client_close_context);
1145
1146void tee_client_get_version(struct tee_context *ctx,
1147 struct tee_ioctl_version_data *vers)
1148{
1149 ctx->teedev->desc->ops->get_version(ctx->teedev, vers);
1150}
1151EXPORT_SYMBOL_GPL(tee_client_get_version);
1152
1153int tee_client_open_session(struct tee_context *ctx,
1154 struct tee_ioctl_open_session_arg *arg,
1155 struct tee_param *param)
1156{
1157 if (!ctx->teedev->desc->ops->open_session)
1158 return -EINVAL;
1159 return ctx->teedev->desc->ops->open_session(ctx, arg, param);
1160}
1161EXPORT_SYMBOL_GPL(tee_client_open_session);
1162
1163int tee_client_close_session(struct tee_context *ctx, u32 session)
1164{
1165 if (!ctx->teedev->desc->ops->close_session)
1166 return -EINVAL;
1167 return ctx->teedev->desc->ops->close_session(ctx, session);
1168}
1169EXPORT_SYMBOL_GPL(tee_client_close_session);
1170
1171int tee_client_invoke_func(struct tee_context *ctx,
1172 struct tee_ioctl_invoke_arg *arg,
1173 struct tee_param *param)
1174{
1175 if (!ctx->teedev->desc->ops->invoke_func)
1176 return -EINVAL;
1177 return ctx->teedev->desc->ops->invoke_func(ctx, arg, param);
1178}
1179EXPORT_SYMBOL_GPL(tee_client_invoke_func);
1180
4f062dc1
IO		 1181int tee_client_cancel_req(struct tee_context *ctx,
1182 struct tee_ioctl_cancel_arg *arg)
1183{
1184 if (!ctx->teedev->desc->ops->cancel_req)
1185 return -EINVAL;
1186 return ctx->teedev->desc->ops->cancel_req(ctx, arg->cancel_id,
1187 arg->session);
1188}
1189
0fc1db9d
SG		 1190static int tee_client_device_match(struct device *dev,
1191 struct device_driver *drv)
1192{
1193 const struct tee_client_device_id *id_table;
1194 struct tee_client_device *tee_device;
1195
1196 id_table = to_tee_client_driver(drv)->id_table;
1197 tee_device = to_tee_client_device(dev);
1198
1199 while (!uuid_is_null(&id_table->uuid)) {
1200 if (uuid_equal(&tee_device->id.uuid, &id_table->uuid))
1201 return 1;
1202 id_table++;
1203 }
1204
1205 return 0;
1206}
1207
1208static int tee_client_device_uevent(struct device *dev,
1209 struct kobj_uevent_env *env)
1210{
1211 uuid_t *dev_id = &to_tee_client_device(dev)->id.uuid;
1212
1213 return add_uevent_var(env, "MODALIAS=tee:%pUb", dev_id);
1214}
1215
1216struct bus_type tee_bus_type = {
1217 .name = "tee",
1218 .match = tee_client_device_match,
1219 .uevent = tee_client_device_uevent,
1220};
1221EXPORT_SYMBOL_GPL(tee_bus_type);
1222
967c9cca
JW		 1223static int __init tee_init(void)
1224{
1225 int rc;
1226
1227 tee_class = class_create(THIS_MODULE, "tee");
1228 if (IS_ERR(tee_class)) {
1229 pr_err("couldn't create class\n");
1230 return PTR_ERR(tee_class);
1231 }
1232
1233 rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee");
1234 if (rc) {
1235 pr_err("failed to allocate char dev region\n");
0fc1db9d
SG		 1236 goto out_unreg_class;
1237 }
1238
1239 rc = bus_register(&tee_bus_type);
1240 if (rc) {
1241 pr_err("failed to register tee bus\n");
1242 goto out_unreg_chrdev;
967c9cca
JW		 1243 }
1244
0fc1db9d
SG		 1245 return 0;
1246
1247out_unreg_chrdev:
1248 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
1249out_unreg_class:
1250 class_destroy(tee_class);
1251 tee_class = NULL;
1252
967c9cca
JW		 1253 return rc;
1254}
1255
1256static void __exit tee_exit(void)
1257{
0fc1db9d
SG		 1258 bus_unregister(&tee_bus_type);
1259 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
967c9cca
JW		 1260 class_destroy(tee_class);
1261 tee_class = NULL;
967c9cca
JW		 1262}
1263
1264subsys_initcall(tee_init);
1265module_exit(tee_exit);
1266
1267MODULE_AUTHOR("Linaro");
1268MODULE_DESCRIPTION("TEE Driver");
1269MODULE_VERSION("1.0");
1270MODULE_LICENSE("GPL v2");
Empty description
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