1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2014, STMicroelectronics International N.V. 4 * Copyright (c) 2015-2020, 2022 Linaro Limited 5 * Copyright (c) 2020-2021, Arm Limited 6 */ 7 8 #include <assert.h> 9 #include <kernel/ldelf_loader.h> 10 #include <kernel/ldelf_syscalls.h> 11 #include <kernel/scall.h> 12 #include <ldelf.h> 13 #include <mm/mobj.h> 14 #include <mm/vm.h> 15 16 extern uint8_t ldelf_data[]; 17 extern const unsigned int ldelf_code_size; 18 extern const unsigned int ldelf_data_size; 19 extern const unsigned int ldelf_entry; 20 21 /* ldelf has the same architecture/register width as the kernel */ 22 #if defined(ARM32) || defined(RV32) 23 static const bool is_32bit = true; 24 #else 25 static const bool is_32bit; 26 #endif 27 28 static TEE_Result alloc_and_map_ldelf_fobj(struct user_mode_ctx *uctx, 29 size_t sz, uint32_t prot, 30 vaddr_t *va) 31 { 32 size_t num_pgs = ROUNDUP(sz, SMALL_PAGE_SIZE) / SMALL_PAGE_SIZE; 33 struct fobj *fobj = fobj_ta_mem_alloc(num_pgs); 34 struct mobj *mobj = mobj_with_fobj_alloc(fobj, NULL, 35 TEE_MATTR_MEM_TYPE_TAGGED); 36 TEE_Result res = TEE_SUCCESS; 37 38 fobj_put(fobj); 39 if (!mobj) 40 return TEE_ERROR_OUT_OF_MEMORY; 41 res = vm_map(uctx, va, num_pgs * SMALL_PAGE_SIZE, 42 prot, VM_FLAG_LDELF, mobj, 0); 43 mobj_put(mobj); 44 45 return res; 46 } 47 48 /* 49 * This function may leave a few mappings behind on error, but that's taken 50 * care of by tee_ta_init_user_ta_session() since the entire context is 51 * removed then. 52 */ 53 TEE_Result ldelf_load_ldelf(struct user_mode_ctx *uctx) 54 { 55 TEE_Result res = TEE_SUCCESS; 56 vaddr_t stack_addr = 0; 57 vaddr_t code_addr = 0; 58 vaddr_t rw_addr = 0; 59 uint32_t prot = 0; 60 61 uctx->is_32bit = is_32bit; 62 63 res = alloc_and_map_ldelf_fobj(uctx, LDELF_STACK_SIZE, 64 TEE_MATTR_URW | TEE_MATTR_PRW, 65 &stack_addr); 66 if (res) 67 return res; 68 uctx->ldelf_stack_ptr = stack_addr + LDELF_STACK_SIZE; 69 70 res = alloc_and_map_ldelf_fobj(uctx, ldelf_code_size, TEE_MATTR_PRW, 71 &code_addr); 72 if (res) 73 return res; 74 uctx->entry_func = code_addr + ldelf_entry; 75 76 rw_addr = ROUNDUP(code_addr + ldelf_code_size, SMALL_PAGE_SIZE); 77 res = alloc_and_map_ldelf_fobj(uctx, ldelf_data_size, 78 TEE_MATTR_URW | TEE_MATTR_PRW, &rw_addr); 79 if (res) 80 return res; 81 82 vm_set_ctx(uctx->ts_ctx); 83 84 memcpy((void *)code_addr, ldelf_data, ldelf_code_size); 85 memcpy((void *)rw_addr, ldelf_data + ldelf_code_size, ldelf_data_size); 86 87 prot = TEE_MATTR_URX; 88 if (IS_ENABLED(CFG_CORE_BTI)) 89 prot |= TEE_MATTR_GUARDED; 90 91 res = vm_set_prot(uctx, code_addr, 92 ROUNDUP(ldelf_code_size, SMALL_PAGE_SIZE), prot); 93 if (res) 94 return res; 95 96 DMSG("ldelf load address %#"PRIxVA, code_addr); 97 98 return TEE_SUCCESS; 99 } 100 101 TEE_Result ldelf_init_with_ldelf(struct ts_session *sess, 102 struct user_mode_ctx *uctx) 103 { 104 TEE_Result res = TEE_SUCCESS; 105 struct ldelf_arg *arg = NULL; 106 uint32_t panic_code = 0; 107 uint32_t panicked = 0; 108 uaddr_t usr_stack = 0; 109 110 usr_stack = uctx->ldelf_stack_ptr; 111 usr_stack -= ROUNDUP(sizeof(*arg), STACK_ALIGNMENT); 112 arg = (struct ldelf_arg *)usr_stack; 113 memset(arg, 0, sizeof(*arg)); 114 arg->uuid = uctx->ts_ctx->uuid; 115 sess->handle_scall = scall_handle_ldelf; 116 117 res = thread_enter_user_mode((vaddr_t)arg, 0, 0, 0, 118 usr_stack, uctx->entry_func, 119 is_32bit, &panicked, &panic_code); 120 121 sess->handle_scall = sess->ctx->ops->handle_scall; 122 thread_user_clear_vfp(uctx); 123 ldelf_sess_cleanup(sess); 124 125 if (panicked) { 126 abort_print_current_ts(); 127 EMSG("ldelf panicked"); 128 return TEE_ERROR_GENERIC; 129 } 130 if (res) { 131 EMSG("ldelf failed with res: %#"PRIx32, res); 132 return res; 133 } 134 135 res = vm_check_access_rights(uctx, 136 TEE_MEMORY_ACCESS_READ | 137 TEE_MEMORY_ACCESS_ANY_OWNER, 138 (uaddr_t)arg, sizeof(*arg)); 139 if (res) 140 return res; 141 142 if (is_user_ta_ctx(uctx->ts_ctx)) { 143 /* 144 * This is already checked by the elf loader, but since it runs 145 * in user mode we're not trusting it entirely. 146 */ 147 if (arg->flags & ~TA_FLAGS_MASK) 148 return TEE_ERROR_BAD_FORMAT; 149 150 to_user_ta_ctx(uctx->ts_ctx)->ta_ctx.flags = arg->flags; 151 } 152 153 uctx->is_32bit = arg->is_32bit; 154 uctx->entry_func = arg->entry_func; 155 uctx->stack_ptr = arg->stack_ptr; 156 uctx->dump_entry_func = arg->dump_entry; 157 #ifdef CFG_FTRACE_SUPPORT 158 uctx->ftrace_entry_func = arg->ftrace_entry; 159 sess->fbuf = arg->fbuf; 160 #endif 161 uctx->dl_entry_func = arg->dl_entry; 162 163 return TEE_SUCCESS; 164 } 165 166 TEE_Result ldelf_dump_state(struct user_mode_ctx *uctx) 167 { 168 TEE_Result res = TEE_SUCCESS; 169 uaddr_t usr_stack = uctx->ldelf_stack_ptr; 170 struct dump_entry_arg *arg = NULL; 171 uint32_t panic_code = 0; 172 uint32_t panicked = 0; 173 struct thread_specific_data *tsd = thread_get_tsd(); 174 struct ts_session *sess = NULL; 175 struct vm_region *r = NULL; 176 size_t n = 0; 177 178 TAILQ_FOREACH(r, &uctx->vm_info.regions, link) 179 if (r->attr & TEE_MATTR_URWX) 180 n++; 181 182 usr_stack = uctx->ldelf_stack_ptr; 183 usr_stack -= ROUNDUP(sizeof(*arg) + n * sizeof(struct dump_map), 184 STACK_ALIGNMENT); 185 arg = (struct dump_entry_arg *)usr_stack; 186 187 res = vm_check_access_rights(uctx, 188 TEE_MEMORY_ACCESS_READ | 189 TEE_MEMORY_ACCESS_ANY_OWNER, 190 (uaddr_t)arg, sizeof(*arg)); 191 if (res) { 192 EMSG("ldelf stack is inaccessible!"); 193 return res; 194 } 195 196 memset(arg, 0, sizeof(*arg) + n * sizeof(struct dump_map)); 197 198 arg->num_maps = n; 199 n = 0; 200 TAILQ_FOREACH(r, &uctx->vm_info.regions, link) { 201 if (r->attr & TEE_MATTR_URWX) { 202 if (r->mobj) 203 mobj_get_pa(r->mobj, r->offset, 0, 204 &arg->maps[n].pa); 205 arg->maps[n].va = r->va; 206 arg->maps[n].sz = r->size; 207 if (r->attr & TEE_MATTR_UR) 208 arg->maps[n].flags |= DUMP_MAP_READ; 209 if (r->attr & TEE_MATTR_UW) 210 arg->maps[n].flags |= DUMP_MAP_WRITE; 211 if (r->attr & TEE_MATTR_UX) 212 arg->maps[n].flags |= DUMP_MAP_EXEC; 213 if (r->attr & TEE_MATTR_SECURE) 214 arg->maps[n].flags |= DUMP_MAP_SECURE; 215 if (r->flags & VM_FLAG_EPHEMERAL) 216 arg->maps[n].flags |= DUMP_MAP_EPHEM; 217 if (r->flags & VM_FLAG_LDELF) 218 arg->maps[n].flags |= DUMP_MAP_LDELF; 219 n++; 220 } 221 } 222 223 arg->is_32bit = uctx->is_32bit; 224 #ifdef ARM32 225 arg->arm32.regs[0] = tsd->abort_regs.r0; 226 arg->arm32.regs[1] = tsd->abort_regs.r1; 227 arg->arm32.regs[2] = tsd->abort_regs.r2; 228 arg->arm32.regs[3] = tsd->abort_regs.r3; 229 arg->arm32.regs[4] = tsd->abort_regs.r4; 230 arg->arm32.regs[5] = tsd->abort_regs.r5; 231 arg->arm32.regs[6] = tsd->abort_regs.r6; 232 arg->arm32.regs[7] = tsd->abort_regs.r7; 233 arg->arm32.regs[8] = tsd->abort_regs.r8; 234 arg->arm32.regs[9] = tsd->abort_regs.r9; 235 arg->arm32.regs[10] = tsd->abort_regs.r10; 236 arg->arm32.regs[11] = tsd->abort_regs.r11; 237 arg->arm32.regs[12] = tsd->abort_regs.ip; 238 arg->arm32.regs[13] = tsd->abort_regs.usr_sp; /*SP*/ 239 arg->arm32.regs[14] = tsd->abort_regs.usr_lr; /*LR*/ 240 arg->arm32.regs[15] = tsd->abort_regs.elr; /*PC*/ 241 #endif /*ARM32*/ 242 #ifdef ARM64 243 if (uctx->is_32bit) { 244 arg->arm32.regs[0] = tsd->abort_regs.x0; 245 arg->arm32.regs[1] = tsd->abort_regs.x1; 246 arg->arm32.regs[2] = tsd->abort_regs.x2; 247 arg->arm32.regs[3] = tsd->abort_regs.x3; 248 arg->arm32.regs[4] = tsd->abort_regs.x4; 249 arg->arm32.regs[5] = tsd->abort_regs.x5; 250 arg->arm32.regs[6] = tsd->abort_regs.x6; 251 arg->arm32.regs[7] = tsd->abort_regs.x7; 252 arg->arm32.regs[8] = tsd->abort_regs.x8; 253 arg->arm32.regs[9] = tsd->abort_regs.x9; 254 arg->arm32.regs[10] = tsd->abort_regs.x10; 255 arg->arm32.regs[11] = tsd->abort_regs.x11; 256 arg->arm32.regs[12] = tsd->abort_regs.x12; 257 arg->arm32.regs[13] = tsd->abort_regs.x13; /*SP*/ 258 arg->arm32.regs[14] = tsd->abort_regs.x14; /*LR*/ 259 arg->arm32.regs[15] = tsd->abort_regs.elr; /*PC*/ 260 } else { 261 arg->arm64.fp = tsd->abort_regs.x29; 262 arg->arm64.pc = tsd->abort_regs.elr; 263 arg->arm64.sp = tsd->abort_regs.sp_el0; 264 } 265 #endif /*ARM64*/ 266 267 sess = ts_get_current_session(); 268 sess->handle_scall = scall_handle_ldelf; 269 270 res = thread_enter_user_mode((vaddr_t)arg, 0, 0, 0, 271 usr_stack, uctx->dump_entry_func, 272 is_32bit, &panicked, &panic_code); 273 274 sess->handle_scall = sess->ctx->ops->handle_scall; 275 thread_user_clear_vfp(uctx); 276 ldelf_sess_cleanup(sess); 277 278 if (panicked) { 279 uctx->dump_entry_func = 0; 280 EMSG("ldelf dump function panicked"); 281 abort_print_current_ts(); 282 res = TEE_ERROR_TARGET_DEAD; 283 } 284 285 return res; 286 } 287 288 #ifdef CFG_FTRACE_SUPPORT 289 TEE_Result ldelf_dump_ftrace(struct user_mode_ctx *uctx, 290 void *buf, size_t *blen) 291 { 292 uaddr_t usr_stack = uctx->ldelf_stack_ptr; 293 TEE_Result res = TEE_SUCCESS; 294 uint32_t panic_code = 0; 295 uint32_t panicked = 0; 296 size_t *arg = NULL; 297 struct ts_session *sess = NULL; 298 299 if (!uctx->ftrace_entry_func) 300 return TEE_ERROR_NOT_SUPPORTED; 301 302 usr_stack -= ROUNDUP(sizeof(*arg), STACK_ALIGNMENT); 303 arg = (size_t *)usr_stack; 304 305 res = vm_check_access_rights(uctx, 306 TEE_MEMORY_ACCESS_READ | 307 TEE_MEMORY_ACCESS_ANY_OWNER, 308 (uaddr_t)arg, sizeof(*arg)); 309 if (res) { 310 EMSG("ldelf stack is inaccessible!"); 311 return res; 312 } 313 314 *arg = *blen; 315 316 sess = ts_get_current_session(); 317 sess->handle_scall = scall_handle_ldelf; 318 319 res = thread_enter_user_mode((vaddr_t)buf, (vaddr_t)arg, 0, 0, 320 usr_stack, uctx->ftrace_entry_func, 321 is_32bit, &panicked, &panic_code); 322 323 sess->handle_scall = sess->ctx->ops->handle_scall; 324 thread_user_clear_vfp(uctx); 325 ldelf_sess_cleanup(sess); 326 327 if (panicked) { 328 uctx->ftrace_entry_func = 0; 329 EMSG("ldelf ftrace function panicked"); 330 abort_print_current_ts(); 331 res = TEE_ERROR_TARGET_DEAD; 332 } 333 334 if (!res) { 335 if (*arg > *blen) 336 res = TEE_ERROR_SHORT_BUFFER; 337 *blen = *arg; 338 } 339 340 return res; 341 } 342 #endif /*CFG_FTRACE_SUPPORT*/ 343 344 TEE_Result ldelf_dlopen(struct user_mode_ctx *uctx, TEE_UUID *uuid, 345 uint32_t flags) 346 { 347 uaddr_t usr_stack = uctx->ldelf_stack_ptr; 348 TEE_Result res = TEE_ERROR_GENERIC; 349 struct dl_entry_arg *arg = NULL; 350 uint32_t panic_code = 0; 351 uint32_t panicked = 0; 352 struct ts_session *sess = NULL; 353 354 assert(uuid); 355 356 usr_stack -= ROUNDUP(sizeof(*arg), STACK_ALIGNMENT); 357 arg = (struct dl_entry_arg *)usr_stack; 358 359 res = vm_check_access_rights(uctx, 360 TEE_MEMORY_ACCESS_READ | 361 TEE_MEMORY_ACCESS_WRITE | 362 TEE_MEMORY_ACCESS_ANY_OWNER, 363 (uaddr_t)arg, sizeof(*arg)); 364 if (res) { 365 EMSG("ldelf stack is inaccessible!"); 366 return res; 367 } 368 369 memset(arg, 0, sizeof(*arg)); 370 arg->cmd = LDELF_DL_ENTRY_DLOPEN; 371 arg->dlopen.uuid = *uuid; 372 arg->dlopen.flags = flags; 373 374 sess = ts_get_current_session(); 375 sess->handle_scall = scall_handle_ldelf; 376 377 res = thread_enter_user_mode((vaddr_t)arg, 0, 0, 0, 378 usr_stack, uctx->dl_entry_func, 379 is_32bit, &panicked, &panic_code); 380 381 sess->handle_scall = sess->ctx->ops->handle_scall; 382 ldelf_sess_cleanup(sess); 383 384 if (panicked) { 385 EMSG("ldelf dl_entry function panicked"); 386 abort_print_current_ts(); 387 res = TEE_ERROR_TARGET_DEAD; 388 } 389 if (!res) 390 res = arg->ret; 391 392 return res; 393 } 394 395 TEE_Result ldelf_dlsym(struct user_mode_ctx *uctx, TEE_UUID *uuid, 396 const char *sym, size_t maxlen, vaddr_t *val) 397 { 398 uaddr_t usr_stack = uctx->ldelf_stack_ptr; 399 TEE_Result res = TEE_ERROR_GENERIC; 400 struct dl_entry_arg *arg = NULL; 401 uint32_t panic_code = 0; 402 uint32_t panicked = 0; 403 size_t len = strnlen(sym, maxlen); 404 struct ts_session *sess = NULL; 405 406 if (len == maxlen) 407 return TEE_ERROR_BAD_PARAMETERS; 408 409 usr_stack -= ROUNDUP(sizeof(*arg) + len + 1, STACK_ALIGNMENT); 410 arg = (struct dl_entry_arg *)usr_stack; 411 412 res = vm_check_access_rights(uctx, 413 TEE_MEMORY_ACCESS_READ | 414 TEE_MEMORY_ACCESS_WRITE | 415 TEE_MEMORY_ACCESS_ANY_OWNER, 416 (uaddr_t)arg, sizeof(*arg) + len + 1); 417 if (res) { 418 EMSG("ldelf stack is inaccessible!"); 419 return res; 420 } 421 422 memset(arg, 0, sizeof(*arg)); 423 arg->cmd = LDELF_DL_ENTRY_DLSYM; 424 arg->dlsym.uuid = *uuid; 425 memcpy(arg->dlsym.symbol, sym, len); 426 arg->dlsym.symbol[len] = '\0'; 427 428 sess = ts_get_current_session(); 429 sess->handle_scall = scall_handle_ldelf; 430 431 res = thread_enter_user_mode((vaddr_t)arg, 0, 0, 0, 432 usr_stack, uctx->dl_entry_func, 433 is_32bit, &panicked, &panic_code); 434 435 sess->handle_scall = sess->ctx->ops->handle_scall; 436 ldelf_sess_cleanup(sess); 437 438 if (panicked) { 439 EMSG("ldelf dl_entry function panicked"); 440 abort_print_current_ts(); 441 res = TEE_ERROR_TARGET_DEAD; 442 } 443 if (!res) { 444 res = arg->ret; 445 if (!res) 446 *val = arg->dlsym.val; 447 } 448 449 return res; 450 } 451