drivers/tee/optee/rpc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015-2021, Linaro Limited
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/delay.h>
   9 #include <linux/i2c.h>
  10 #include <linux/rpmb.h>
  11 #include <linux/slab.h>
  12 #include <linux/tee_core.h>
  13 #include "optee_private.h"
  14 #include "optee_rpc_cmd.h"
  15
  16 static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
  17 {
  18         struct timespec64 ts;
  19
  20         if (arg->num_params != 1)
  21                 goto bad;
  22         if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
  23                         OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
  24                 goto bad;
  25
  26         ktime_get_real_ts64(&ts);
  27         arg->params[0].u.value.a = ts.tv_sec;
  28         arg->params[0].u.value.b = ts.tv_nsec;
  29
  30         arg->ret = TEEC_SUCCESS;
  31         return;
  32 bad:
  33         arg->ret = TEEC_ERROR_BAD_PARAMETERS;
  34 }
  35
  36 #if IS_REACHABLE(CONFIG_I2C)
  37 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
  38                                              struct optee_msg_arg *arg)
  39 {
  40         struct optee *optee = tee_get_drvdata(ctx->teedev);
  41         struct tee_param *params;
  42         struct i2c_adapter *adapter;
  43         struct i2c_msg msg = { };
  44         size_t i;
  45         int ret = -EOPNOTSUPP;
  46         u8 attr[] = {
  47                 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
  48                 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
  49                 TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT,
  50                 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT,
  51         };
  52
  53         if (arg->num_params != ARRAY_SIZE(attr)) {
  54                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
  55                 return;
  56         }
  57
  58         params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
  59                                GFP_KERNEL);
  60         if (!params) {
  61                 arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
  62                 return;
  63         }
  64
  65         if (optee->ops->from_msg_param(optee, params, arg->num_params,
  66                                        arg->params))
  67                 goto bad;
  68
  69         for (i = 0; i < arg->num_params; i++) {
  70                 if (params[i].attr != attr[i])
  71                         goto bad;
  72         }
  73
  74         adapter = i2c_get_adapter(params[0].u.value.b);
  75         if (!adapter)
  76                 goto bad;
  77
  78         if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) {
  79                 if (!i2c_check_functionality(adapter,
  80                                              I2C_FUNC_10BIT_ADDR)) {
  81                         i2c_put_adapter(adapter);
  82                         goto bad;
  83                 }
  84
  85                 msg.flags = I2C_M_TEN;
  86         }
  87
  88         msg.addr = params[0].u.value.c;
  89         msg.buf  = params[2].u.memref.shm->kaddr;
  90         msg.len  = params[2].u.memref.size;
  91
  92         switch (params[0].u.value.a) {
  93         case OPTEE_RPC_I2C_TRANSFER_RD:
  94                 msg.flags |= I2C_M_RD;
  95                 break;
  96         case OPTEE_RPC_I2C_TRANSFER_WR:
  97                 break;
  98         default:
  99                 i2c_put_adapter(adapter);
 100                 goto bad;
 101         }
 102
 103         ret = i2c_transfer(adapter, &msg, 1);
 104
 105         if (ret < 0) {
 106                 arg->ret = TEEC_ERROR_COMMUNICATION;
 107         } else {
 108                 params[3].u.value.a = msg.len;
 109                 if (optee->ops->to_msg_param(optee, arg->params,
 110                                              arg->num_params, params))
 111                         arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 112                 else
 113                         arg->ret = TEEC_SUCCESS;
 114         }
 115
 116         i2c_put_adapter(adapter);
 117         kfree(params);
 118         return;
 119 bad:
 120         kfree(params);
 121         arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 122 }
 123 #else
 124 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
 125                                              struct optee_msg_arg *arg)
 126 {
 127         arg->ret = TEEC_ERROR_NOT_SUPPORTED;
 128 }
 129 #endif
 130
 131 static void handle_rpc_func_cmd_wq(struct optee *optee,
 132                                    struct optee_msg_arg *arg)
 133 {
 134         int rc = 0;
 135
 136         if (arg->num_params != 1)
 137                 goto bad;
 138
 139         if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
 140                         OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
 141                 goto bad;
 142
 143         switch (arg->params[0].u.value.a) {
 144         case OPTEE_RPC_NOTIFICATION_WAIT:
 145                 rc = optee_notif_wait(optee, arg->params[0].u.value.b, arg->params[0].u.value.c);
 146                 if (rc)
 147                         goto bad;
 148                 break;
 149         case OPTEE_RPC_NOTIFICATION_SEND:
 150                 if (optee_notif_send(optee, arg->params[0].u.value.b))
 151                         goto bad;
 152                 break;
 153         default:
 154                 goto bad;
 155         }
 156
 157         arg->ret = TEEC_SUCCESS;
 158         return;
 159 bad:
 160         if (rc == -ETIMEDOUT)
 161                 arg->ret = TEE_ERROR_TIMEOUT;
 162         else
 163                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 164 }
 165
 166 static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
 167 {
 168         u32 msec_to_wait;
 169
 170         if (arg->num_params != 1)
 171                 goto bad;
 172
 173         if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
 174                         OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
 175                 goto bad;
 176
 177         msec_to_wait = arg->params[0].u.value.a;
 178
 179         /* Go to interruptible sleep */
 180         msleep_interruptible(msec_to_wait);
 181
 182         arg->ret = TEEC_SUCCESS;
 183         return;
 184 bad:
 185         arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 186 }
 187
 188 static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee,
 189                                 struct optee_msg_arg *arg)
 190 {
 191         struct tee_param *params;
 192
 193         arg->ret_origin = TEEC_ORIGIN_COMMS;
 194
 195         params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
 196                                GFP_KERNEL);
 197         if (!params) {
 198                 arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
 199                 return;
 200         }
 201
 202         if (optee->ops->from_msg_param(optee, params, arg->num_params,
 203                                        arg->params)) {
 204                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 205                 goto out;
 206         }
 207
 208         arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
 209
 210         if (optee->ops->to_msg_param(optee, arg->params, arg->num_params,
 211                                      params))
 212                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 213 out:
 214         kfree(params);
 215 }
 216
 217 struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
 218 {
 219         u32 ret;
 220         struct tee_param param;
 221         struct optee *optee = tee_get_drvdata(ctx->teedev);
 222         struct tee_shm *shm;
 223
 224         param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
 225         param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL;
 226         param.u.value.b = sz;
 227         param.u.value.c = 0;
 228
 229         ret = optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_ALLOC, 1, &param);
 230         if (ret)
 231                 return ERR_PTR(-ENOMEM);
 232
 233         mutex_lock(&optee->supp.mutex);
 234         /* Increases count as secure world doesn't have a reference */
 235         shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
 236         mutex_unlock(&optee->supp.mutex);
 237         return shm;
 238 }
 239
 240 void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
 241 {
 242         struct tee_param param;
 243
 244         param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
 245         param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL;
 246         param.u.value.b = tee_shm_get_id(shm);
 247         param.u.value.c = 0;
 248
 249         /*
 250          * Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure
 251          * world has released its reference.
 252          *
 253          * It's better to do this before sending the request to supplicant
 254          * as we'd like to let the process doing the initial allocation to
 255          * do release the last reference too in order to avoid stacking
 256          * many pending fput() on the client process. This could otherwise
 257          * happen if secure world does many allocate and free in a single
 258          * invoke.
 259          */
 260         tee_shm_put(shm);
 261
 262         optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, &param);
 263 }
 264
 265 static void handle_rpc_func_rpmb_probe_reset(struct tee_context *ctx,
 266                                              struct optee *optee,
 267                                              struct optee_msg_arg *arg)
 268 {
 269         struct tee_param params[1];
 270
 271         if (arg->num_params != ARRAY_SIZE(params) ||
 272             optee->ops->from_msg_param(optee, params, arg->num_params,
 273                                        arg->params) ||
 274             params[0].attr != TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT) {
 275                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 276                 return;
 277         }
 278
 279         params[0].u.value.a = OPTEE_RPC_SHM_TYPE_KERNEL;
 280         params[0].u.value.b = 0;
 281         params[0].u.value.c = 0;
 282         if (optee->ops->to_msg_param(optee, arg->params,
 283                                      arg->num_params, params)) {
 284                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 285                 return;
 286         }
 287
 288         mutex_lock(&optee->rpmb_dev_mutex);
 289         rpmb_dev_put(optee->rpmb_dev);
 290         optee->rpmb_dev = NULL;
 291         mutex_unlock(&optee->rpmb_dev_mutex);
 292
 293         arg->ret = TEEC_SUCCESS;
 294 }
 295
 296 static int rpmb_type_to_rpc_type(enum rpmb_type rtype)
 297 {
 298         switch (rtype) {
 299         case RPMB_TYPE_EMMC:
 300                 return OPTEE_RPC_RPMB_EMMC;
 301         case RPMB_TYPE_UFS:
 302                 return OPTEE_RPC_RPMB_UFS;
 303         case RPMB_TYPE_NVME:
 304                 return OPTEE_RPC_RPMB_NVME;
 305         default:
 306                 return -1;
 307         }
 308 }
 309
 310 static int rpc_rpmb_match(struct device *dev, const void *data)
 311 {
 312         struct rpmb_dev *rdev = to_rpmb_dev(dev);
 313
 314         return rpmb_type_to_rpc_type(rdev->descr.type) >= 0;
 315 }
 316
 317 static void handle_rpc_func_rpmb_probe_next(struct tee_context *ctx,
 318                                             struct optee *optee,
 319                                             struct optee_msg_arg *arg)
 320 {
 321         struct rpmb_dev *rdev;
 322         struct tee_param params[2];
 323         void *buf;
 324
 325         if (arg->num_params != ARRAY_SIZE(params) ||
 326             optee->ops->from_msg_param(optee, params, arg->num_params,
 327                                        arg->params) ||
 328             params[0].attr != TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT ||
 329             params[1].attr != TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT) {
 330                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 331                 return;
 332         }
 333         buf = tee_shm_get_va(params[1].u.memref.shm,
 334                              params[1].u.memref.shm_offs);
 335         if (IS_ERR(buf)) {
 336                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 337                 return;
 338         }
 339
 340         mutex_lock(&optee->rpmb_dev_mutex);
 341         rdev = rpmb_dev_find_device(NULL, optee->rpmb_dev, rpc_rpmb_match);
 342         rpmb_dev_put(optee->rpmb_dev);
 343         optee->rpmb_dev = rdev;
 344         mutex_unlock(&optee->rpmb_dev_mutex);
 345
 346         if (!rdev) {
 347                 arg->ret = TEEC_ERROR_ITEM_NOT_FOUND;
 348                 return;
 349         }
 350
 351         if (params[1].u.memref.size < rdev->descr.dev_id_len) {
 352                 arg->ret = TEEC_ERROR_SHORT_BUFFER;
 353                 return;
 354         }
 355         memcpy(buf, rdev->descr.dev_id, rdev->descr.dev_id_len);
 356         params[1].u.memref.size = rdev->descr.dev_id_len;
 357         params[0].u.value.a = rpmb_type_to_rpc_type(rdev->descr.type);
 358         params[0].u.value.b = rdev->descr.capacity;
 359         params[0].u.value.c = rdev->descr.reliable_wr_count;
 360         if (optee->ops->to_msg_param(optee, arg->params,
 361                                      arg->num_params, params)) {
 362                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 363                 return;
 364         }
 365
 366         arg->ret = TEEC_SUCCESS;
 367 }
 368
 369 static void handle_rpc_func_rpmb_frames(struct tee_context *ctx,
 370                                         struct optee *optee,
 371                                         struct optee_msg_arg *arg)
 372 {
 373         struct tee_param params[2];
 374         struct rpmb_dev *rdev;
 375         void *p0, *p1;
 376
 377         mutex_lock(&optee->rpmb_dev_mutex);
 378         rdev = rpmb_dev_get(optee->rpmb_dev);
 379         mutex_unlock(&optee->rpmb_dev_mutex);
 380         if (!rdev) {
 381                 arg->ret = TEEC_ERROR_ITEM_NOT_FOUND;
 382                 return;
 383         }
 384
 385         if (arg->num_params != ARRAY_SIZE(params) ||
 386             optee->ops->from_msg_param(optee, params, arg->num_params,
 387                                        arg->params) ||
 388             params[0].attr != TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT ||
 389             params[1].attr != TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT) {
 390                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 391                 goto out;
 392         }
 393
 394         p0 = tee_shm_get_va(params[0].u.memref.shm,
 395                             params[0].u.memref.shm_offs);
 396         p1 = tee_shm_get_va(params[1].u.memref.shm,
 397                             params[1].u.memref.shm_offs);
 398         if (rpmb_route_frames(rdev, p0, params[0].u.memref.size, p1,
 399                               params[1].u.memref.size)) {
 400                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 401                 goto out;
 402         }
 403         if (optee->ops->to_msg_param(optee, arg->params,
 404                                      arg->num_params, params)) {
 405                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 406                 goto out;
 407         }
 408         arg->ret = TEEC_SUCCESS;
 409 out:
 410         rpmb_dev_put(rdev);
 411 }
 412
 413 void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
 414                    struct optee_msg_arg *arg)
 415 {
 416         switch (arg->cmd) {
 417         case OPTEE_RPC_CMD_GET_TIME:
 418                 handle_rpc_func_cmd_get_time(arg);
 419                 break;
 420         case OPTEE_RPC_CMD_NOTIFICATION:
 421                 handle_rpc_func_cmd_wq(optee, arg);
 422                 break;
 423         case OPTEE_RPC_CMD_SUSPEND:
 424                 handle_rpc_func_cmd_wait(arg);
 425                 break;
 426         case OPTEE_RPC_CMD_I2C_TRANSFER:
 427                 handle_rpc_func_cmd_i2c_transfer(ctx, arg);
 428                 break;
 429         /*
 430          * optee->in_kernel_rpmb_routing true means that OP-TEE supports
 431          * in-kernel RPMB routing _and_ that the RPMB subsystem is
 432          * reachable. This is reported to user space with
 433          * rpmb_routing_model=kernel in sysfs.
 434          *
 435          * rpmb_routing_model=kernel is also a promise to user space that
 436          * RPMB access will not require supplicant support, hence the
 437          * checks below.
 438          */
 439         case OPTEE_RPC_CMD_RPMB_PROBE_RESET:
 440                 if (optee->in_kernel_rpmb_routing)
 441                         handle_rpc_func_rpmb_probe_reset(ctx, optee, arg);
 442                 else
 443                         handle_rpc_supp_cmd(ctx, optee, arg);
 444                 break;
 445         case OPTEE_RPC_CMD_RPMB_PROBE_NEXT:
 446                 if (optee->in_kernel_rpmb_routing)
 447                         handle_rpc_func_rpmb_probe_next(ctx, optee, arg);
 448                 else
 449                         handle_rpc_supp_cmd(ctx, optee, arg);
 450                 break;
 451         case OPTEE_RPC_CMD_RPMB_FRAMES:
 452                 if (optee->in_kernel_rpmb_routing)
 453                         handle_rpc_func_rpmb_frames(ctx, optee, arg);
 454                 else
 455                         handle_rpc_supp_cmd(ctx, optee, arg);
 456                 break;
 457         default:
 458                 handle_rpc_supp_cmd(ctx, optee, arg);
 459         }
 460 }
 461
 462