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 static 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 74 void teedev_ctx_get(struct tee_context *ctx) 75 { 76 if (ctx->releasing) 77 return; 78 79 kref_get(&ctx->refcount); 80 } 81 82 static 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 91 void 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 99 static void teedev_close_context(struct tee_context *ctx) 100 { 101 tee_device_put(ctx->teedev); 102 teedev_ctx_put(ctx); 103 } 104 105 static 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 } 121 122 static 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 */ 140 static 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; 185 186 out_free_desc: 187 kfree(desc); 188 189 out_free_shash: 190 crypto_free_shash(shash); 191 return rc; 192 } 193 194 int 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); 259 out_free_name: 260 kfree(name); 261 262 return rc; 263 } 264 EXPORT_SYMBOL_GPL(tee_session_calc_client_uuid); 265 266 static 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 } 281 282 static 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 } 317 318 static int 319 tee_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 } 354 355 static 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 } 433 434 static 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 } 461 462 static 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 } 501 502 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 } 508 509 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); 521 out: 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++) 532 if (tee_param_is_memref(params + n) && 533 params[n].u.memref.shm) 534 tee_shm_put(params[n].u.memref.shm); 535 kfree(params); 536 } 537 538 return rc; 539 } 540 541 static 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); 590 out: 591 if (params) { 592 /* Decrease ref count for all valid shared memory pointers */ 593 for (n = 0; n < arg.num_params; n++) 594 if (tee_param_is_memref(params + n) && 595 params[n].u.memref.shm) 596 tee_shm_put(params[n].u.memref.shm); 597 kfree(params); 598 } 599 return rc; 600 } 601 602 static 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 } 616 617 static int 618 tee_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 } 631 632 static 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; 641 642 ip.attr = p->attr; 643 switch (p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) { 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 } 675 676 static 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; 706 707 rc = params_from_user(ctx, params, num_params, uarg->params); 708 if (rc) 709 goto out; 710 711 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); 722 out: 723 kfree(params); 724 return rc; 725 } 726 727 static 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 */ 740 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK) 741 return -EINVAL; 742 743 p->attr = ip.attr; 744 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) { 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 } 772 773 static 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); 811 out: 812 kfree(params); 813 return rc; 814 } 815 816 static 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); 826 case TEE_IOC_SHM_REGISTER: 827 return tee_ioctl_shm_register(ctx, uarg); 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 } 844 845 static const struct file_operations tee_fops = { 846 .owner = THIS_MODULE, 847 .open = tee_open, 848 .release = tee_release, 849 .unlocked_ioctl = tee_ioctl, 850 .compat_ioctl = compat_ptr_ioctl, 851 }; 852 853 static 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 */ 877 struct 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; 884 int rc, max_id; 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 } 897 898 max_id = TEE_NUM_DEVICES / 2; 899 900 if (teedesc->flags & TEE_DESC_PRIVILEGED) { 901 offs = TEE_NUM_DEVICES / 2; 902 max_id = TEE_NUM_DEVICES; 903 } 904 905 spin_lock(&driver_lock); 906 teedev->id = find_next_zero_bit(dev_mask, max_id, offs); 907 if (teedev->id < max_id) 908 set_bit(teedev->id, dev_mask); 909 spin_unlock(&driver_lock); 910 911 if (teedev->id >= max_id) { 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; 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; 948 err_devt: 949 unregister_chrdev_region(teedev->dev.devt, 1); 950 err: 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 } 961 EXPORT_SYMBOL_GPL(tee_device_alloc); 962 963 static 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 } 972 static DEVICE_ATTR_RO(implementation_id); 973 974 static struct attribute *tee_dev_attrs[] = { 975 &dev_attr_implementation_id.attr, 976 NULL 977 }; 978 979 ATTRIBUTE_GROUPS(tee_dev); 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 */ 990 int 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 } 998 999 teedev->dev.groups = tee_dev_groups; 1000 1001 rc = cdev_device_add(&teedev->cdev, &teedev->dev); 1002 if (rc) { 1003 dev_err(&teedev->dev, 1004 "unable to cdev_device_add() %s, major %d, minor %d, err=%d\n", 1005 teedev->name, MAJOR(teedev->dev.devt), 1006 MINOR(teedev->dev.devt), rc); 1007 return rc; 1008 } 1009 1010 teedev->flags |= TEE_DEVICE_FLAG_REGISTERED; 1011 return 0; 1012 } 1013 EXPORT_SYMBOL_GPL(tee_device_register); 1014 1015 void 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 1029 bool 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 */ 1049 void tee_device_unregister(struct tee_device *teedev) 1050 { 1051 if (!teedev) 1052 return; 1053 1054 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) 1055 cdev_device_del(&teedev->cdev, &teedev->dev); 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 } 1069 EXPORT_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 */ 1076 void *tee_get_drvdata(struct tee_device *teedev) 1077 { 1078 return dev_get_drvdata(&teedev->dev); 1079 } 1080 EXPORT_SYMBOL_GPL(tee_get_drvdata); 1081 1082 struct 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 1088 static 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 1097 struct tee_context * 1098 tee_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); 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 */ 1133 if (!IS_ERR(ctx)) 1134 ctx->supp_nowait = true; 1135 1136 return ctx; 1137 } 1138 EXPORT_SYMBOL_GPL(tee_client_open_context); 1139 1140 void tee_client_close_context(struct tee_context *ctx) 1141 { 1142 teedev_close_context(ctx); 1143 } 1144 EXPORT_SYMBOL_GPL(tee_client_close_context); 1145 1146 void 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 } 1151 EXPORT_SYMBOL_GPL(tee_client_get_version); 1152 1153 int 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 } 1161 EXPORT_SYMBOL_GPL(tee_client_open_session); 1162 1163 int 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 } 1169 EXPORT_SYMBOL_GPL(tee_client_close_session); 1170 1171 int 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 } 1179 EXPORT_SYMBOL_GPL(tee_client_invoke_func); 1180 1181 int 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 1190 static 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 1208 static 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 1216 struct bus_type tee_bus_type = { 1217 .name = "tee", 1218 .match = tee_client_device_match, 1219 .uevent = tee_client_device_uevent, 1220 }; 1221 EXPORT_SYMBOL_GPL(tee_bus_type); 1222 1223 static 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"); 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; 1243 } 1244 1245 return 0; 1246 1247 out_unreg_chrdev: 1248 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); 1249 out_unreg_class: 1250 class_destroy(tee_class); 1251 tee_class = NULL; 1252 1253 return rc; 1254 } 1255 1256 static void __exit tee_exit(void) 1257 { 1258 bus_unregister(&tee_bus_type); 1259 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); 1260 class_destroy(tee_class); 1261 tee_class = NULL; 1262 } 1263 1264 subsys_initcall(tee_init); 1265 module_exit(tee_exit); 1266 1267 MODULE_AUTHOR("Linaro"); 1268 MODULE_DESCRIPTION("TEE Driver"); 1269 MODULE_VERSION("1.0"); 1270 MODULE_LICENSE("GPL v2"); 1271