1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2019, Linaro Limited 4 * Copyright (c) 2020, Arm Limited. 5 */ 6 7 #include <crypto/crypto.h> 8 #include <ffa.h> 9 #include <keep.h> 10 #include <kernel/abort.h> 11 #include <kernel/stmm_sp.h> 12 #include <kernel/user_mode_ctx.h> 13 #include <mm/fobj.h> 14 #include <mm/mobj.h> 15 #include <mm/vm.h> 16 #include <pta_stmm.h> 17 #include <tee_api_defines_extensions.h> 18 #include <tee/tee_pobj.h> 19 #include <tee/tee_svc.h> 20 #include <tee/tee_svc_storage.h> 21 #include <zlib.h> 22 23 #include "thread_private.h" 24 25 #ifdef ARM64 26 #define SVC_REGS_A0(_regs) ((_regs)->x0) 27 #define SVC_REGS_A1(_regs) ((_regs)->x1) 28 #define SVC_REGS_A2(_regs) ((_regs)->x2) 29 #define SVC_REGS_A3(_regs) ((_regs)->x3) 30 #define SVC_REGS_A4(_regs) ((_regs)->x4) 31 #define SVC_REGS_A5(_regs) ((_regs)->x5) 32 #define SVC_REGS_A6(_regs) ((_regs)->x6) 33 #define SVC_REGS_A7(_regs) ((_regs)->x7) 34 #define __FFA_SVC_RPMB_READ FFA_SVC_RPMB_READ 35 #define __FFA_SVC_RPMB_WRITE FFA_SVC_RPMB_WRITE 36 #define __FFA_SVC_MEMORY_ATTRIBUTES_GET FFA_SVC_MEMORY_ATTRIBUTES_GET_64 37 #define __FFA_SVC_MEMORY_ATTRIBUTES_SET FFA_SVC_MEMORY_ATTRIBUTES_SET_64 38 #define __FFA_MSG_SEND_DIRECT_RESP FFA_MSG_SEND_DIRECT_RESP_64 39 #define __FFA_MSG_SEND_DIRECT_REQ FFA_MSG_SEND_DIRECT_REQ_64 40 #endif 41 #ifdef ARM32 42 #define SVC_REGS_A0(_regs) ((_regs)->r0) 43 #define SVC_REGS_A1(_regs) ((_regs)->r1) 44 #define SVC_REGS_A2(_regs) ((_regs)->r2) 45 #define SVC_REGS_A3(_regs) ((_regs)->r3) 46 #define SVC_REGS_A4(_regs) ((_regs)->r4) 47 #define SVC_REGS_A5(_regs) ((_regs)->r5) 48 #define SVC_REGS_A6(_regs) ((_regs)->r6) 49 #define SVC_REGS_A7(_regs) ((_regs)->r7) 50 #define __FFA_SVC_RPMB_READ FFA_SVC_RPMB_READ_32 51 #define __FFA_SVC_RPMB_WRITE FFA_SVC_RPMB_WRITE_32 52 #define __FFA_SVC_MEMORY_ATTRIBUTES_GET FFA_SVC_MEMORY_ATTRIBUTES_GET_32 53 #define __FFA_SVC_MEMORY_ATTRIBUTES_SET FFA_SVC_MEMORY_ATTRIBUTES_SET_32 54 #define __FFA_MSG_SEND_DIRECT_RESP FFA_MSG_SEND_DIRECT_RESP_32 55 #define __FFA_MSG_SEND_DIRECT_REQ FFA_MSG_SEND_DIRECT_REQ_32 56 #endif 57 58 static const TEE_UUID stmm_uuid = PTA_STMM_UUID; 59 60 /* 61 * Once a complete FFA spec is added, these will become discoverable. 62 * Until then these are considered part of the internal ABI between 63 * OP-TEE and StMM. 64 */ 65 static const uint16_t stmm_id = 1U; 66 static const uint16_t stmm_pta_id = 2U; 67 static const uint16_t mem_mgr_id = 3U; 68 static const uint16_t ffa_storage_id = 4U; 69 70 static const unsigned int stmm_stack_size = 4 * SMALL_PAGE_SIZE; 71 static const unsigned int stmm_heap_size = 398 * SMALL_PAGE_SIZE; 72 static const unsigned int stmm_sec_buf_size = 4 * SMALL_PAGE_SIZE; 73 static const unsigned int stmm_ns_comm_buf_size = 4 * SMALL_PAGE_SIZE; 74 75 extern unsigned char stmm_image[]; 76 extern const unsigned int stmm_image_size; 77 extern const unsigned int stmm_image_uncompressed_size; 78 79 static struct stmm_ctx *stmm_alloc_ctx(const TEE_UUID *uuid) 80 { 81 TEE_Result res = TEE_SUCCESS; 82 struct stmm_ctx *spc = NULL; 83 84 spc = calloc(1, sizeof(*spc)); 85 if (!spc) 86 return NULL; 87 88 spc->ta_ctx.ts_ctx.ops = &stmm_sp_ops; 89 spc->ta_ctx.ts_ctx.uuid = *uuid; 90 spc->ta_ctx.flags = TA_FLAG_SINGLE_INSTANCE | 91 TA_FLAG_INSTANCE_KEEP_ALIVE; 92 spc->uctx.ts_ctx = &spc->ta_ctx.ts_ctx; 93 94 res = vm_info_init(&spc->uctx); 95 if (res) { 96 free(spc); 97 return NULL; 98 } 99 100 spc->ta_ctx.ref_count = 1; 101 condvar_init(&spc->ta_ctx.busy_cv); 102 103 return spc; 104 } 105 106 static TEE_Result stmm_enter_user_mode(struct stmm_ctx *spc) 107 { 108 uint32_t exceptions = 0; 109 uint32_t panic_code = 0; 110 uint32_t panicked = 0; 111 uint64_t cntkctl = 0; 112 113 exceptions = thread_mask_exceptions(THREAD_EXCP_ALL); 114 cntkctl = read_cntkctl(); 115 write_cntkctl(cntkctl | CNTKCTL_PL0PCTEN); 116 __thread_enter_user_mode(&spc->regs, &panicked, &panic_code); 117 write_cntkctl(cntkctl); 118 thread_unmask_exceptions(exceptions); 119 120 thread_user_clear_vfp(&spc->uctx); 121 122 if (panicked) { 123 abort_print_current_ts(); 124 DMSG("stmm panicked with code %#"PRIx32, panic_code); 125 return TEE_ERROR_TARGET_DEAD; 126 } 127 128 return TEE_SUCCESS; 129 } 130 131 #ifdef ARM64 132 static void init_stmm_regs(struct stmm_ctx *spc, unsigned long a0, 133 unsigned long a1, unsigned long sp, unsigned long pc) 134 { 135 spc->regs.x[0] = a0; 136 spc->regs.x[1] = a1; 137 spc->regs.sp = sp; 138 spc->regs.pc = pc; 139 } 140 #endif 141 142 #ifdef ARM32 143 static uint32_t __maybe_unused get_spsr(void) 144 { 145 uint32_t s = 0; 146 147 s = read_cpsr(); 148 s &= ~(CPSR_MODE_MASK | CPSR_T | ARM32_CPSR_IT_MASK); 149 s |= CPSR_MODE_USR; 150 151 return s; 152 } 153 154 static void init_stmm_regs(struct stmm_ctx *spc, unsigned long a0, 155 unsigned long a1, unsigned long sp, unsigned long pc) 156 { 157 spc->regs.r0 = a0; 158 spc->regs.r1 = a1; 159 spc->regs.usr_sp = sp; 160 spc->regs.cpsr = get_spsr(); 161 spc->regs.pc = pc; 162 } 163 #endif 164 165 static TEE_Result alloc_and_map_sp_fobj(struct stmm_ctx *spc, size_t sz, 166 uint32_t prot, vaddr_t *va) 167 { 168 size_t num_pgs = ROUNDUP(sz, SMALL_PAGE_SIZE) / SMALL_PAGE_SIZE; 169 struct fobj *fobj = fobj_ta_mem_alloc(num_pgs); 170 struct mobj *mobj = mobj_with_fobj_alloc(fobj, NULL); 171 TEE_Result res = TEE_SUCCESS; 172 173 fobj_put(fobj); 174 if (!mobj) 175 return TEE_ERROR_OUT_OF_MEMORY; 176 177 res = vm_map(&spc->uctx, va, num_pgs * SMALL_PAGE_SIZE, 178 prot, 0, mobj, 0); 179 if (res) 180 mobj_put(mobj); 181 182 return TEE_SUCCESS; 183 } 184 185 static void *zalloc(void *opaque __unused, unsigned int items, 186 unsigned int size) 187 { 188 return malloc(items * size); 189 } 190 191 static void zfree(void *opaque __unused, void *address) 192 { 193 free(address); 194 } 195 196 static void uncompress_image(void *dst, size_t dst_size, void *src, 197 size_t src_size) 198 { 199 z_stream strm = { 200 .next_in = src, 201 .avail_in = src_size, 202 .next_out = dst, 203 .avail_out = dst_size, 204 .zalloc = zalloc, 205 .zfree = zfree, 206 }; 207 208 if (inflateInit(&strm) != Z_OK) 209 panic("inflateInit"); 210 211 if (inflate(&strm, Z_SYNC_FLUSH) != Z_STREAM_END) 212 panic("inflate"); 213 214 if (inflateEnd(&strm) != Z_OK) 215 panic("inflateEnd"); 216 } 217 218 static TEE_Result load_stmm(struct stmm_ctx *spc) 219 { 220 struct stmm_boot_info *boot_info = NULL; 221 struct stmm_mp_info *mp_info = NULL; 222 TEE_Result res = TEE_SUCCESS; 223 vaddr_t sp_addr = 0; 224 vaddr_t image_addr = 0; 225 vaddr_t heap_addr = 0; 226 vaddr_t stack_addr = 0; 227 vaddr_t sec_buf_addr = 0; 228 vaddr_t comm_buf_addr = 0; 229 unsigned int sp_size = 0; 230 unsigned int uncompressed_size_roundup = 0; 231 232 uncompressed_size_roundup = ROUNDUP(stmm_image_uncompressed_size, 233 SMALL_PAGE_SIZE); 234 sp_size = uncompressed_size_roundup + stmm_stack_size + 235 stmm_heap_size + stmm_sec_buf_size; 236 res = alloc_and_map_sp_fobj(spc, sp_size, 237 TEE_MATTR_PRW, &sp_addr); 238 if (res) 239 return res; 240 241 res = alloc_and_map_sp_fobj(spc, stmm_ns_comm_buf_size, 242 TEE_MATTR_URW | TEE_MATTR_PRW, 243 &comm_buf_addr); 244 /* 245 * We don't need to free the previous instance here, they'll all be 246 * handled during the destruction call (stmm_ctx_destroy()) 247 */ 248 if (res) 249 return res; 250 251 image_addr = sp_addr; 252 heap_addr = image_addr + uncompressed_size_roundup; 253 stack_addr = heap_addr + stmm_heap_size; 254 sec_buf_addr = stack_addr + stmm_stack_size; 255 256 vm_set_ctx(&spc->ta_ctx.ts_ctx); 257 uncompress_image((void *)image_addr, stmm_image_uncompressed_size, 258 stmm_image, stmm_image_size); 259 260 res = vm_set_prot(&spc->uctx, image_addr, uncompressed_size_roundup, 261 TEE_MATTR_URX | TEE_MATTR_PR); 262 if (res) 263 return res; 264 265 res = vm_set_prot(&spc->uctx, heap_addr, stmm_heap_size, 266 TEE_MATTR_URW | TEE_MATTR_PRW); 267 if (res) 268 return res; 269 270 res = vm_set_prot(&spc->uctx, stack_addr, stmm_stack_size, 271 TEE_MATTR_URW | TEE_MATTR_PRW); 272 if (res) 273 return res; 274 275 res = vm_set_prot(&spc->uctx, sec_buf_addr, stmm_sec_buf_size, 276 TEE_MATTR_URW | TEE_MATTR_PRW); 277 if (res) 278 return res; 279 280 DMSG("stmm load address %#"PRIxVA, image_addr); 281 282 boot_info = (struct stmm_boot_info *)sec_buf_addr; 283 mp_info = (struct stmm_mp_info *)(boot_info + 1); 284 *boot_info = (struct stmm_boot_info){ 285 .h.type = STMM_PARAM_SP_IMAGE_BOOT_INFO, 286 .h.version = STMM_PARAM_VERSION_1, 287 .h.size = sizeof(struct stmm_boot_info), 288 .h.attr = 0, 289 .sp_mem_base = sp_addr, 290 .sp_mem_limit = sp_addr + sp_size, 291 .sp_image_base = image_addr, 292 .sp_stack_base = stack_addr, 293 .sp_heap_base = heap_addr, 294 .sp_ns_comm_buf_base = comm_buf_addr, 295 .sp_shared_buf_base = sec_buf_addr, 296 .sp_image_size = stmm_image_size, 297 .sp_pcpu_stack_size = stmm_stack_size, 298 .sp_heap_size = stmm_heap_size, 299 .sp_ns_comm_buf_size = stmm_ns_comm_buf_size, 300 .sp_shared_buf_size = stmm_sec_buf_size, 301 .num_sp_mem_regions = 6, 302 .num_cpus = 1, 303 .mp_info = mp_info, 304 }; 305 mp_info->mpidr = read_mpidr(); 306 mp_info->linear_id = 0; 307 mp_info->flags = MP_INFO_FLAG_PRIMARY_CPU; 308 spc->ns_comm_buf_addr = comm_buf_addr; 309 spc->ns_comm_buf_size = stmm_ns_comm_buf_size; 310 311 init_stmm_regs(spc, sec_buf_addr, 312 (vaddr_t)(mp_info + 1) - sec_buf_addr, 313 stack_addr + stmm_stack_size, image_addr); 314 315 return stmm_enter_user_mode(spc); 316 } 317 318 TEE_Result stmm_init_session(const TEE_UUID *uuid, struct tee_ta_session *sess) 319 { 320 struct stmm_ctx *spc = NULL; 321 TEE_Result res = TEE_SUCCESS; 322 323 if (memcmp(uuid, &stmm_uuid, sizeof(*uuid))) 324 return TEE_ERROR_ITEM_NOT_FOUND; 325 326 spc = stmm_alloc_ctx(uuid); 327 if (!spc) 328 return TEE_ERROR_OUT_OF_MEMORY; 329 330 spc->is_initializing = true; 331 332 mutex_lock(&tee_ta_mutex); 333 sess->ts_sess.ctx = &spc->ta_ctx.ts_ctx; 334 sess->ts_sess.handle_svc = sess->ts_sess.ctx->ops->handle_svc; 335 mutex_unlock(&tee_ta_mutex); 336 337 ts_push_current_session(&sess->ts_sess); 338 res = load_stmm(spc); 339 ts_pop_current_session(); 340 vm_set_ctx(NULL); 341 if (res) { 342 sess->ts_sess.ctx = NULL; 343 spc->ta_ctx.ts_ctx.ops->destroy(&spc->ta_ctx.ts_ctx); 344 345 return res; 346 } 347 348 mutex_lock(&tee_ta_mutex); 349 spc->is_initializing = false; 350 TAILQ_INSERT_TAIL(&tee_ctxes, &spc->ta_ctx, link); 351 mutex_unlock(&tee_ta_mutex); 352 353 return TEE_SUCCESS; 354 } 355 356 static TEE_Result stmm_enter_open_session(struct ts_session *s) 357 { 358 struct stmm_ctx *spc = to_stmm_ctx(s->ctx); 359 struct tee_ta_session *ta_sess = to_ta_session(s); 360 const uint32_t exp_pt = TEE_PARAM_TYPES(TEE_PARAM_TYPE_NONE, 361 TEE_PARAM_TYPE_NONE, 362 TEE_PARAM_TYPE_NONE, 363 TEE_PARAM_TYPE_NONE); 364 365 if (ta_sess->param->types != exp_pt) 366 return TEE_ERROR_BAD_PARAMETERS; 367 368 if (spc->is_initializing) { 369 /* StMM is initialized in stmm_init_session() */ 370 ta_sess->err_origin = TEE_ORIGIN_TEE; 371 return TEE_ERROR_BAD_STATE; 372 } 373 374 return TEE_SUCCESS; 375 } 376 377 static TEE_Result stmm_enter_invoke_cmd(struct ts_session *s, uint32_t cmd) 378 { 379 struct stmm_ctx *spc = to_stmm_ctx(s->ctx); 380 struct tee_ta_session *ta_sess = to_ta_session(s); 381 TEE_Result res = TEE_SUCCESS; 382 TEE_Result __maybe_unused tmp_res = TEE_SUCCESS; 383 unsigned int ns_buf_size = 0; 384 struct param_mem *mem = NULL; 385 void *va = NULL; 386 const uint32_t exp_pt = TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INOUT, 387 TEE_PARAM_TYPE_VALUE_OUTPUT, 388 TEE_PARAM_TYPE_NONE, 389 TEE_PARAM_TYPE_NONE); 390 391 if (cmd != PTA_STMM_CMD_COMMUNICATE) 392 return TEE_ERROR_BAD_PARAMETERS; 393 394 if (ta_sess->param->types != exp_pt) 395 return TEE_ERROR_BAD_PARAMETERS; 396 397 mem = &ta_sess->param->u[0].mem; 398 ns_buf_size = mem->size; 399 if (ns_buf_size > spc->ns_comm_buf_size) { 400 mem->size = spc->ns_comm_buf_size; 401 return TEE_ERROR_EXCESS_DATA; 402 } 403 404 res = mobj_inc_map(mem->mobj); 405 if (res) 406 return res; 407 408 va = mobj_get_va(mem->mobj, mem->offs, mem->size); 409 if (!va) { 410 EMSG("Can't get a valid VA for NS buffer"); 411 res = TEE_ERROR_BAD_PARAMETERS; 412 goto out_va; 413 } 414 415 #ifdef ARM64 416 spc->regs.x[0] = __FFA_MSG_SEND_DIRECT_REQ; 417 spc->regs.x[1] = (stmm_pta_id << 16) | stmm_id; 418 spc->regs.x[2] = FFA_PARAM_MBZ; 419 spc->regs.x[3] = spc->ns_comm_buf_addr; 420 spc->regs.x[4] = ns_buf_size; 421 spc->regs.x[5] = 0; 422 spc->regs.x[6] = 0; 423 spc->regs.x[7] = 0; 424 #endif 425 #ifdef ARM32 426 spc->regs.r0 = __FFA_MSG_SEND_DIRECT_REQ; 427 spc->regs.r1 = (stmm_pta_id << 16) | stmm_id; 428 spc->regs.r2 = FFA_PARAM_MBZ; 429 spc->regs.r3 = spc->ns_comm_buf_addr; 430 spc->regs.r4 = ns_buf_size; 431 spc->regs.r5 = 0; 432 spc->regs.r6 = 0; 433 spc->regs.r7 = 0; 434 #endif 435 436 ts_push_current_session(s); 437 438 memcpy((void *)spc->ns_comm_buf_addr, va, ns_buf_size); 439 440 res = stmm_enter_user_mode(spc); 441 if (res) 442 goto out_session; 443 /* 444 * Copy the SPM response from secure partition back to the non-secure 445 * buffer of the client that called us. 446 */ 447 #ifdef ARM64 448 ta_sess->param->u[1].val.a = spc->regs.x[4]; 449 #endif 450 #ifdef ARM32 451 ta_sess->param->u[1].val.a = spc->regs.r4; 452 #endif 453 454 memcpy(va, (void *)spc->ns_comm_buf_addr, ns_buf_size); 455 456 out_session: 457 ts_pop_current_session(); 458 out_va: 459 tmp_res = mobj_dec_map(mem->mobj); 460 assert(!tmp_res); 461 462 return res; 463 } 464 465 static void stmm_enter_close_session(struct ts_session *s __unused) 466 { 467 } 468 469 static void stmm_dump_state(struct ts_ctx *ctx) 470 { 471 user_mode_ctx_print_mappings(to_user_mode_ctx(ctx)); 472 } 473 DECLARE_KEEP_PAGER(stmm_dump_state); 474 475 static uint32_t stmm_get_instance_id(struct ts_ctx *ctx) 476 { 477 return to_stmm_ctx(ctx)->uctx.vm_info.asid; 478 } 479 480 static void stmm_ctx_destroy(struct ts_ctx *ctx) 481 { 482 struct stmm_ctx *spc = to_stmm_ctx(ctx); 483 484 tee_pager_rem_um_regions(&spc->uctx); 485 vm_info_final(&spc->uctx); 486 free(spc); 487 } 488 489 static uint32_t sp_svc_get_mem_attr(vaddr_t va) 490 { 491 TEE_Result res = TEE_ERROR_BAD_PARAMETERS; 492 struct ts_session *sess = NULL; 493 struct stmm_ctx *spc = NULL; 494 uint16_t attrs = 0; 495 uint16_t perm = 0; 496 497 if (!va) 498 goto err; 499 500 sess = ts_get_current_session(); 501 spc = to_stmm_ctx(sess->ctx); 502 503 res = vm_get_prot(&spc->uctx, va, SMALL_PAGE_SIZE, &attrs); 504 if (res) 505 goto err; 506 507 if (attrs & TEE_MATTR_UR) 508 perm |= STMM_MEM_ATTR_ACCESS_RO; 509 else if (attrs & TEE_MATTR_UW) 510 perm |= STMM_MEM_ATTR_ACCESS_RW; 511 512 if (attrs & TEE_MATTR_UX) 513 perm |= STMM_MEM_ATTR_EXEC; 514 515 return perm; 516 err: 517 return STMM_RET_DENIED; 518 } 519 520 static int sp_svc_set_mem_attr(vaddr_t va, unsigned int nr_pages, uint32_t perm) 521 { 522 TEE_Result res = TEE_ERROR_BAD_PARAMETERS; 523 struct ts_session *sess = NULL; 524 struct stmm_ctx *spc = NULL; 525 size_t sz = 0; 526 uint32_t prot = 0; 527 528 if (!va || !nr_pages || MUL_OVERFLOW(nr_pages, SMALL_PAGE_SIZE, &sz)) 529 return STMM_RET_INVALID_PARAM; 530 531 if (perm & ~STMM_MEM_ATTR_ALL) 532 return STMM_RET_INVALID_PARAM; 533 534 sess = ts_get_current_session(); 535 spc = to_stmm_ctx(sess->ctx); 536 537 if ((perm & STMM_MEM_ATTR_ACCESS_MASK) == STMM_MEM_ATTR_ACCESS_RO) 538 prot |= TEE_MATTR_UR; 539 else if ((perm & STMM_MEM_ATTR_ACCESS_MASK) == STMM_MEM_ATTR_ACCESS_RW) 540 prot |= TEE_MATTR_URW; 541 542 if ((perm & STMM_MEM_ATTR_EXEC_NEVER) == STMM_MEM_ATTR_EXEC) 543 prot |= TEE_MATTR_UX; 544 545 res = vm_set_prot(&spc->uctx, va, sz, prot); 546 if (res) 547 return STMM_RET_DENIED; 548 549 return STMM_RET_SUCCESS; 550 } 551 552 #ifdef ARM64 553 static void save_sp_ctx(struct stmm_ctx *spc, struct thread_svc_regs *svc_regs) 554 { 555 size_t n = 0; 556 557 /* Save the return values from StMM */ 558 for (n = 0; n <= 7; n++) 559 spc->regs.x[n] = *(&svc_regs->x0 + n); 560 561 spc->regs.sp = svc_regs->sp_el0; 562 spc->regs.pc = svc_regs->elr; 563 spc->regs.cpsr = svc_regs->spsr; 564 } 565 #endif 566 567 #ifdef ARM32 568 static void save_sp_ctx(struct stmm_ctx *spc, struct thread_svc_regs *svc_regs) 569 { 570 spc->regs.r0 = svc_regs->r0; 571 spc->regs.r1 = svc_regs->r1; 572 spc->regs.r2 = svc_regs->r2; 573 spc->regs.r3 = svc_regs->r3; 574 spc->regs.r4 = svc_regs->r4; 575 spc->regs.r5 = svc_regs->r5; 576 spc->regs.r6 = svc_regs->r6; 577 spc->regs.r7 = svc_regs->r7; 578 spc->regs.pc = svc_regs->lr; 579 spc->regs.cpsr = svc_regs->spsr; 580 spc->regs.usr_sp = thread_get_usr_sp(); 581 } 582 #endif 583 584 static void return_from_sp_helper(bool panic, uint32_t panic_code, 585 struct thread_svc_regs *svc_regs) 586 { 587 struct ts_session *sess = ts_get_current_session(); 588 struct stmm_ctx *spc = to_stmm_ctx(sess->ctx); 589 590 if (panic) 591 spc->ta_ctx.panicked = true; 592 else 593 save_sp_ctx(spc, svc_regs); 594 595 SVC_REGS_A0(svc_regs) = 0; 596 SVC_REGS_A1(svc_regs) = panic; 597 SVC_REGS_A2(svc_regs) = panic_code; 598 } 599 600 static void service_compose_direct_resp(struct thread_svc_regs *regs, 601 uint32_t ret_val) 602 { 603 uint16_t src_id = 0; 604 uint16_t dst_id = 0; 605 606 /* extract from request */ 607 src_id = (SVC_REGS_A1(regs) >> 16) & UINT16_MAX; 608 dst_id = SVC_REGS_A1(regs) & UINT16_MAX; 609 610 /* compose message */ 611 SVC_REGS_A0(regs) = __FFA_MSG_SEND_DIRECT_RESP; 612 /* swap endpoint ids */ 613 SVC_REGS_A1(regs) = SHIFT_U32(dst_id, 16) | src_id; 614 SVC_REGS_A2(regs) = FFA_PARAM_MBZ; 615 SVC_REGS_A3(regs) = ret_val; 616 SVC_REGS_A4(regs) = 0; 617 SVC_REGS_A5(regs) = 0; 618 SVC_REGS_A6(regs) = 0; 619 SVC_REGS_A7(regs) = 0; 620 } 621 622 /* 623 * Combined read from secure partition, this will open, read and 624 * close the file object. 625 */ 626 static TEE_Result sec_storage_obj_read(unsigned long storage_id, char *obj_id, 627 unsigned long obj_id_len, void *data, 628 unsigned long len, unsigned long offset, 629 unsigned long flags) 630 { 631 const struct tee_file_operations *fops = NULL; 632 TEE_Result res = TEE_ERROR_BAD_STATE; 633 struct ts_session *sess = NULL; 634 struct tee_file_handle *fh = NULL; 635 struct stmm_ctx *spc = NULL; 636 struct tee_pobj *po = NULL; 637 size_t file_size = 0; 638 size_t read_len = 0; 639 640 fops = tee_svc_storage_file_ops(storage_id); 641 if (!fops) 642 return TEE_ERROR_ITEM_NOT_FOUND; 643 644 if (obj_id_len > TEE_OBJECT_ID_MAX_LEN) 645 return TEE_ERROR_BAD_PARAMETERS; 646 647 sess = ts_get_current_session(); 648 spc = to_stmm_ctx(sess->ctx); 649 res = vm_check_access_rights(&spc->uctx, 650 TEE_MEMORY_ACCESS_WRITE | 651 TEE_MEMORY_ACCESS_ANY_OWNER, 652 (uaddr_t)data, len); 653 if (res != TEE_SUCCESS) 654 return res; 655 656 res = tee_pobj_get(&sess->ctx->uuid, obj_id, obj_id_len, flags, 657 false, fops, &po); 658 if (res != TEE_SUCCESS) 659 return res; 660 661 res = po->fops->open(po, &file_size, &fh); 662 if (res != TEE_SUCCESS) 663 goto out; 664 665 read_len = len; 666 res = po->fops->read(fh, offset, data, &read_len); 667 if (res == TEE_ERROR_CORRUPT_OBJECT) { 668 EMSG("Object corrupt"); 669 po->fops->remove(po); 670 } else if (res == TEE_SUCCESS && len != read_len) { 671 res = TEE_ERROR_CORRUPT_OBJECT; 672 } 673 674 po->fops->close(&fh); 675 676 out: 677 tee_pobj_release(po); 678 679 return res; 680 } 681 682 /* 683 * Combined write from secure partition, this will create/open, write and 684 * close the file object. 685 */ 686 static TEE_Result sec_storage_obj_write(unsigned long storage_id, char *obj_id, 687 unsigned long obj_id_len, void *data, 688 unsigned long len, unsigned long offset, 689 unsigned long flags) 690 691 { 692 const struct tee_file_operations *fops = NULL; 693 struct ts_session *sess = NULL; 694 struct tee_file_handle *fh = NULL; 695 struct stmm_ctx *spc = NULL; 696 TEE_Result res = TEE_SUCCESS; 697 struct tee_pobj *po = NULL; 698 699 fops = tee_svc_storage_file_ops(storage_id); 700 if (!fops) 701 return TEE_ERROR_ITEM_NOT_FOUND; 702 703 if (obj_id_len > TEE_OBJECT_ID_MAX_LEN) 704 return TEE_ERROR_BAD_PARAMETERS; 705 706 sess = ts_get_current_session(); 707 spc = to_stmm_ctx(sess->ctx); 708 res = vm_check_access_rights(&spc->uctx, 709 TEE_MEMORY_ACCESS_READ | 710 TEE_MEMORY_ACCESS_ANY_OWNER, 711 (uaddr_t)data, len); 712 if (res != TEE_SUCCESS) 713 return res; 714 715 res = tee_pobj_get(&sess->ctx->uuid, obj_id, obj_id_len, flags, 716 false, fops, &po); 717 if (res != TEE_SUCCESS) 718 return res; 719 720 res = po->fops->open(po, NULL, &fh); 721 if (res == TEE_ERROR_ITEM_NOT_FOUND) 722 res = po->fops->create(po, false, NULL, 0, NULL, 0, NULL, 0, 723 &fh); 724 if (res == TEE_SUCCESS) { 725 res = po->fops->write(fh, offset, data, len); 726 po->fops->close(&fh); 727 } 728 729 tee_pobj_release(po); 730 731 return res; 732 } 733 734 static void stmm_handle_mem_mgr_service(struct thread_svc_regs *regs) 735 { 736 uint32_t action = SVC_REGS_A3(regs); 737 uintptr_t va = SVC_REGS_A4(regs); 738 uint32_t nr_pages = SVC_REGS_A5(regs); 739 uint32_t perm = SVC_REGS_A6(regs); 740 741 switch (action) { 742 case __FFA_SVC_MEMORY_ATTRIBUTES_GET: 743 service_compose_direct_resp(regs, sp_svc_get_mem_attr(va)); 744 break; 745 case __FFA_SVC_MEMORY_ATTRIBUTES_SET: 746 service_compose_direct_resp(regs, 747 sp_svc_set_mem_attr(va, nr_pages, 748 perm)); 749 break; 750 default: 751 EMSG("Undefined service id %#"PRIx32, action); 752 service_compose_direct_resp(regs, STMM_RET_INVALID_PARAM); 753 break; 754 } 755 } 756 757 static uint32_t tee2stmm_ret_val(TEE_Result res) 758 { 759 switch (res) { 760 case TEE_SUCCESS: 761 return STMM_RET_SUCCESS; 762 case TEE_ERROR_NOT_SUPPORTED: 763 return STMM_RET_NOT_SUPPORTED; 764 case TEE_ERROR_ACCESS_DENIED: 765 return STMM_RET_DENIED; 766 case TEE_ERROR_OUT_OF_MEMORY: 767 return STMM_RET_NO_MEM; 768 case TEE_ERROR_BAD_PARAMETERS: 769 default: 770 return STMM_RET_INVALID_PARAM; 771 } 772 } 773 774 #define FILENAME "EFI_VARS" 775 static void stmm_handle_storage_service(struct thread_svc_regs *regs) 776 { 777 uint32_t flags = TEE_DATA_FLAG_ACCESS_READ | 778 TEE_DATA_FLAG_ACCESS_WRITE | 779 TEE_DATA_FLAG_SHARE_READ | 780 TEE_DATA_FLAG_SHARE_WRITE; 781 uint32_t action = SVC_REGS_A3(regs); 782 void *va = (void *)SVC_REGS_A4(regs); 783 unsigned long len = SVC_REGS_A5(regs); 784 unsigned long offset = SVC_REGS_A6(regs); 785 char obj_id[] = FILENAME; 786 size_t obj_id_len = strlen(obj_id); 787 TEE_Result res = TEE_SUCCESS; 788 uint32_t stmm_rc = STMM_RET_INVALID_PARAM; 789 790 switch (action) { 791 case __FFA_SVC_RPMB_READ: 792 DMSG("RPMB read"); 793 res = sec_storage_obj_read(TEE_STORAGE_PRIVATE_RPMB, obj_id, 794 obj_id_len, va, len, offset, flags); 795 stmm_rc = tee2stmm_ret_val(res); 796 break; 797 case __FFA_SVC_RPMB_WRITE: 798 DMSG("RPMB write"); 799 res = sec_storage_obj_write(TEE_STORAGE_PRIVATE_RPMB, obj_id, 800 obj_id_len, va, len, offset, flags); 801 stmm_rc = tee2stmm_ret_val(res); 802 break; 803 default: 804 EMSG("Undefined service id %#"PRIx32, action); 805 break; 806 } 807 808 service_compose_direct_resp(regs, stmm_rc); 809 } 810 811 static void spm_eret_error(int32_t error_code, struct thread_svc_regs *regs) 812 { 813 SVC_REGS_A0(regs) = FFA_ERROR; 814 SVC_REGS_A1(regs) = FFA_PARAM_MBZ; 815 SVC_REGS_A2(regs) = error_code; 816 SVC_REGS_A3(regs) = FFA_PARAM_MBZ; 817 SVC_REGS_A4(regs) = FFA_PARAM_MBZ; 818 SVC_REGS_A5(regs) = FFA_PARAM_MBZ; 819 SVC_REGS_A6(regs) = FFA_PARAM_MBZ; 820 SVC_REGS_A7(regs) = FFA_PARAM_MBZ; 821 } 822 823 static void spm_handle_direct_req(struct thread_svc_regs *regs) 824 { 825 uint16_t dst_id = SVC_REGS_A1(regs) & UINT16_MAX; 826 827 if (dst_id == mem_mgr_id) { 828 stmm_handle_mem_mgr_service(regs); 829 } else if (dst_id == ffa_storage_id) { 830 stmm_handle_storage_service(regs); 831 } else { 832 EMSG("Undefined endpoint id %#"PRIx16, dst_id); 833 spm_eret_error(STMM_RET_INVALID_PARAM, regs); 834 } 835 } 836 837 /* Return true if returning to SP, false if returning to caller */ 838 static bool spm_handle_svc(struct thread_svc_regs *regs) 839 { 840 #ifdef ARM64 841 uint64_t *a0 = ®s->x0; 842 #endif 843 #ifdef ARM32 844 uint32_t *a0 = ®s->r0; 845 #endif 846 847 switch (*a0) { 848 case FFA_VERSION: 849 DMSG("Received FFA version"); 850 *a0 = MAKE_FFA_VERSION(FFA_VERSION_MAJOR, FFA_VERSION_MINOR); 851 return true; 852 case __FFA_MSG_SEND_DIRECT_RESP: 853 DMSG("Received FFA direct response"); 854 return_from_sp_helper(false, 0, regs); 855 return false; 856 case __FFA_MSG_SEND_DIRECT_REQ: 857 DMSG("Received FFA direct request"); 858 spm_handle_direct_req(regs); 859 return true; 860 default: 861 EMSG("Undefined syscall %#"PRIx32, (uint32_t)*a0); 862 return_from_sp_helper(true /*panic*/, 0xabcd, regs); 863 return false; 864 } 865 } 866 867 /* 868 * Note: this variable is weak just to ease breaking its dependency chain 869 * when added to the unpaged area. 870 */ 871 const struct ts_ops stmm_sp_ops __weak __rodata_unpaged("stmm_sp_ops") = { 872 .enter_open_session = stmm_enter_open_session, 873 .enter_invoke_cmd = stmm_enter_invoke_cmd, 874 .enter_close_session = stmm_enter_close_session, 875 .dump_state = stmm_dump_state, 876 .destroy = stmm_ctx_destroy, 877 .get_instance_id = stmm_get_instance_id, 878 .handle_svc = spm_handle_svc, 879 }; 880