| 1 | /* |
| 2 | * lttng-filter-validator.c |
| 3 | * |
| 4 | * LTTng UST filter bytecode validator. |
| 5 | * |
| 6 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 9 | * of this software and associated documentation files (the "Software"), to deal |
| 10 | * in the Software without restriction, including without limitation the rights |
| 11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 12 | * copies of the Software, and to permit persons to whom the Software is |
| 13 | * furnished to do so, subject to the following conditions: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 24 | * SOFTWARE. |
| 25 | */ |
| 26 | |
| 27 | #define _LGPL_SOURCE |
| 28 | #include <urcu-bp.h> |
| 29 | #include <time.h> |
| 30 | #include "lttng-filter.h" |
| 31 | |
| 32 | #include <urcu/rculfhash.h> |
| 33 | #include "lttng-hash-helper.h" |
| 34 | #include "string-utils.h" |
| 35 | |
| 36 | /* |
| 37 | * Number of merge points for hash table size. Hash table initialized to |
| 38 | * that size, and we do not resize, because we do not want to trigger |
| 39 | * RCU worker thread execution: fall-back on linear traversal if number |
| 40 | * of merge points exceeds this value. |
| 41 | */ |
| 42 | #define DEFAULT_NR_MERGE_POINTS 128 |
| 43 | #define MIN_NR_BUCKETS 128 |
| 44 | #define MAX_NR_BUCKETS 128 |
| 45 | |
| 46 | /* merge point table node */ |
| 47 | struct lfht_mp_node { |
| 48 | struct cds_lfht_node node; |
| 49 | |
| 50 | /* Context at merge point */ |
| 51 | struct vstack stack; |
| 52 | unsigned long target_pc; |
| 53 | }; |
| 54 | |
| 55 | static unsigned long lttng_hash_seed; |
| 56 | static unsigned int lttng_hash_seed_ready; |
| 57 | |
| 58 | static |
| 59 | int lttng_hash_match(struct cds_lfht_node *node, const void *key) |
| 60 | { |
| 61 | struct lfht_mp_node *mp_node = |
| 62 | caa_container_of(node, struct lfht_mp_node, node); |
| 63 | unsigned long key_pc = (unsigned long) key; |
| 64 | |
| 65 | if (mp_node->target_pc == key_pc) |
| 66 | return 1; |
| 67 | else |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static |
| 72 | int merge_points_compare(const struct vstack *stacka, |
| 73 | const struct vstack *stackb) |
| 74 | { |
| 75 | int i, len; |
| 76 | |
| 77 | if (stacka->top != stackb->top) |
| 78 | return 1; |
| 79 | len = stacka->top + 1; |
| 80 | assert(len >= 0); |
| 81 | for (i = 0; i < len; i++) { |
| 82 | if (stacka->e[i].type != REG_UNKNOWN |
| 83 | && stackb->e[i].type != REG_UNKNOWN |
| 84 | && stacka->e[i].type != stackb->e[i].type) |
| 85 | return 1; |
| 86 | } |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | static |
| 91 | int merge_point_add_check(struct cds_lfht *ht, unsigned long target_pc, |
| 92 | const struct vstack *stack) |
| 93 | { |
| 94 | struct lfht_mp_node *node; |
| 95 | unsigned long hash = lttng_hash_mix((const char *) target_pc, |
| 96 | sizeof(target_pc), |
| 97 | lttng_hash_seed); |
| 98 | struct cds_lfht_node *ret; |
| 99 | |
| 100 | dbg_printf("Filter: adding merge point at offset %lu, hash %lu\n", |
| 101 | target_pc, hash); |
| 102 | node = zmalloc(sizeof(struct lfht_mp_node)); |
| 103 | if (!node) |
| 104 | return -ENOMEM; |
| 105 | node->target_pc = target_pc; |
| 106 | memcpy(&node->stack, stack, sizeof(node->stack)); |
| 107 | ret = cds_lfht_add_unique(ht, hash, lttng_hash_match, |
| 108 | (const char *) target_pc, &node->node); |
| 109 | if (ret != &node->node) { |
| 110 | struct lfht_mp_node *ret_mp = |
| 111 | caa_container_of(ret, struct lfht_mp_node, node); |
| 112 | |
| 113 | /* Key already present */ |
| 114 | dbg_printf("Filter: compare merge points for offset %lu, hash %lu\n", |
| 115 | target_pc, hash); |
| 116 | free(node); |
| 117 | if (merge_points_compare(stack, &ret_mp->stack)) { |
| 118 | ERR("Merge points differ for offset %lu\n", |
| 119 | target_pc); |
| 120 | return -EINVAL; |
| 121 | } |
| 122 | } |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | /* |
| 127 | * Binary comparators use top of stack and top of stack -1. |
| 128 | * Return 0 if typing is known to match, 1 if typing is dynamic |
| 129 | * (unknown), negative error value on error. |
| 130 | */ |
| 131 | static |
| 132 | int bin_op_compare_check(struct vstack *stack, filter_opcode_t opcode, |
| 133 | const char *str) |
| 134 | { |
| 135 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) |
| 136 | goto error_empty; |
| 137 | |
| 138 | switch (vstack_ax(stack)->type) { |
| 139 | default: |
| 140 | goto error_type; |
| 141 | |
| 142 | case REG_UNKNOWN: |
| 143 | goto unknown; |
| 144 | case REG_STRING: |
| 145 | switch (vstack_bx(stack)->type) { |
| 146 | default: |
| 147 | goto error_type; |
| 148 | |
| 149 | case REG_UNKNOWN: |
| 150 | goto unknown; |
| 151 | case REG_STRING: |
| 152 | break; |
| 153 | case REG_STAR_GLOB_STRING: |
| 154 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { |
| 155 | goto error_mismatch; |
| 156 | } |
| 157 | break; |
| 158 | case REG_S64: |
| 159 | case REG_DOUBLE: |
| 160 | goto error_mismatch; |
| 161 | } |
| 162 | break; |
| 163 | case REG_STAR_GLOB_STRING: |
| 164 | switch (vstack_bx(stack)->type) { |
| 165 | default: |
| 166 | goto error_type; |
| 167 | |
| 168 | case REG_UNKNOWN: |
| 169 | goto unknown; |
| 170 | case REG_STRING: |
| 171 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { |
| 172 | goto error_mismatch; |
| 173 | } |
| 174 | break; |
| 175 | case REG_STAR_GLOB_STRING: |
| 176 | case REG_S64: |
| 177 | case REG_DOUBLE: |
| 178 | goto error_mismatch; |
| 179 | } |
| 180 | break; |
| 181 | case REG_S64: |
| 182 | case REG_DOUBLE: |
| 183 | switch (vstack_bx(stack)->type) { |
| 184 | default: |
| 185 | goto error_type; |
| 186 | |
| 187 | case REG_UNKNOWN: |
| 188 | goto unknown; |
| 189 | case REG_STRING: |
| 190 | case REG_STAR_GLOB_STRING: |
| 191 | goto error_mismatch; |
| 192 | case REG_S64: |
| 193 | case REG_DOUBLE: |
| 194 | break; |
| 195 | } |
| 196 | break; |
| 197 | } |
| 198 | return 0; |
| 199 | |
| 200 | unknown: |
| 201 | return 1; |
| 202 | |
| 203 | error_mismatch: |
| 204 | ERR("type mismatch for '%s' binary operator\n", str); |
| 205 | return -EINVAL; |
| 206 | |
| 207 | error_empty: |
| 208 | ERR("empty stack for '%s' binary operator\n", str); |
| 209 | return -EINVAL; |
| 210 | |
| 211 | error_type: |
| 212 | ERR("unknown type for '%s' binary operator\n", str); |
| 213 | return -EINVAL; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Binary bitwise operators use top of stack and top of stack -1. |
| 218 | * Return 0 if typing is known to match, 1 if typing is dynamic |
| 219 | * (unknown), negative error value on error. |
| 220 | */ |
| 221 | static |
| 222 | int bin_op_bitwise_check(struct vstack *stack, filter_opcode_t opcode, |
| 223 | const char *str) |
| 224 | { |
| 225 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) |
| 226 | goto error_empty; |
| 227 | |
| 228 | switch (vstack_ax(stack)->type) { |
| 229 | default: |
| 230 | goto error_type; |
| 231 | |
| 232 | case REG_UNKNOWN: |
| 233 | goto unknown; |
| 234 | case REG_S64: |
| 235 | switch (vstack_bx(stack)->type) { |
| 236 | default: |
| 237 | goto error_type; |
| 238 | |
| 239 | case REG_UNKNOWN: |
| 240 | goto unknown; |
| 241 | case REG_S64: |
| 242 | break; |
| 243 | } |
| 244 | break; |
| 245 | } |
| 246 | return 0; |
| 247 | |
| 248 | unknown: |
| 249 | return 1; |
| 250 | |
| 251 | error_empty: |
| 252 | ERR("empty stack for '%s' binary operator\n", str); |
| 253 | return -EINVAL; |
| 254 | |
| 255 | error_type: |
| 256 | ERR("unknown type for '%s' binary operator\n", str); |
| 257 | return -EINVAL; |
| 258 | } |
| 259 | |
| 260 | static |
| 261 | int validate_get_symbol(struct bytecode_runtime *bytecode, |
| 262 | const struct get_symbol *sym) |
| 263 | { |
| 264 | const char *str, *str_limit; |
| 265 | size_t len_limit; |
| 266 | |
| 267 | if (sym->offset >= bytecode->p.bc->bc.len - bytecode->p.bc->bc.reloc_offset) |
| 268 | return -EINVAL; |
| 269 | |
| 270 | str = bytecode->p.bc->bc.data + bytecode->p.bc->bc.reloc_offset + sym->offset; |
| 271 | str_limit = bytecode->p.bc->bc.data + bytecode->p.bc->bc.len; |
| 272 | len_limit = str_limit - str; |
| 273 | if (strnlen(str, len_limit) == len_limit) |
| 274 | return -EINVAL; |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * Validate bytecode range overflow within the validation pass. |
| 280 | * Called for each instruction encountered. |
| 281 | */ |
| 282 | static |
| 283 | int bytecode_validate_overflow(struct bytecode_runtime *bytecode, |
| 284 | char *start_pc, char *pc) |
| 285 | { |
| 286 | int ret = 0; |
| 287 | |
| 288 | switch (*(filter_opcode_t *) pc) { |
| 289 | case FILTER_OP_UNKNOWN: |
| 290 | default: |
| 291 | { |
| 292 | ERR("unknown bytecode op %u\n", |
| 293 | (unsigned int) *(filter_opcode_t *) pc); |
| 294 | ret = -EINVAL; |
| 295 | break; |
| 296 | } |
| 297 | |
| 298 | case FILTER_OP_RETURN: |
| 299 | case FILTER_OP_RETURN_S64: |
| 300 | { |
| 301 | if (unlikely(pc + sizeof(struct return_op) |
| 302 | > start_pc + bytecode->len)) { |
| 303 | ret = -ERANGE; |
| 304 | } |
| 305 | break; |
| 306 | } |
| 307 | |
| 308 | /* binary */ |
| 309 | case FILTER_OP_MUL: |
| 310 | case FILTER_OP_DIV: |
| 311 | case FILTER_OP_MOD: |
| 312 | case FILTER_OP_PLUS: |
| 313 | case FILTER_OP_MINUS: |
| 314 | { |
| 315 | ERR("unsupported bytecode op %u\n", |
| 316 | (unsigned int) *(filter_opcode_t *) pc); |
| 317 | ret = -EINVAL; |
| 318 | break; |
| 319 | } |
| 320 | |
| 321 | case FILTER_OP_EQ: |
| 322 | case FILTER_OP_NE: |
| 323 | case FILTER_OP_GT: |
| 324 | case FILTER_OP_LT: |
| 325 | case FILTER_OP_GE: |
| 326 | case FILTER_OP_LE: |
| 327 | case FILTER_OP_EQ_STRING: |
| 328 | case FILTER_OP_NE_STRING: |
| 329 | case FILTER_OP_GT_STRING: |
| 330 | case FILTER_OP_LT_STRING: |
| 331 | case FILTER_OP_GE_STRING: |
| 332 | case FILTER_OP_LE_STRING: |
| 333 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 334 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 335 | case FILTER_OP_EQ_S64: |
| 336 | case FILTER_OP_NE_S64: |
| 337 | case FILTER_OP_GT_S64: |
| 338 | case FILTER_OP_LT_S64: |
| 339 | case FILTER_OP_GE_S64: |
| 340 | case FILTER_OP_LE_S64: |
| 341 | case FILTER_OP_EQ_DOUBLE: |
| 342 | case FILTER_OP_NE_DOUBLE: |
| 343 | case FILTER_OP_GT_DOUBLE: |
| 344 | case FILTER_OP_LT_DOUBLE: |
| 345 | case FILTER_OP_GE_DOUBLE: |
| 346 | case FILTER_OP_LE_DOUBLE: |
| 347 | case FILTER_OP_EQ_DOUBLE_S64: |
| 348 | case FILTER_OP_NE_DOUBLE_S64: |
| 349 | case FILTER_OP_GT_DOUBLE_S64: |
| 350 | case FILTER_OP_LT_DOUBLE_S64: |
| 351 | case FILTER_OP_GE_DOUBLE_S64: |
| 352 | case FILTER_OP_LE_DOUBLE_S64: |
| 353 | case FILTER_OP_EQ_S64_DOUBLE: |
| 354 | case FILTER_OP_NE_S64_DOUBLE: |
| 355 | case FILTER_OP_GT_S64_DOUBLE: |
| 356 | case FILTER_OP_LT_S64_DOUBLE: |
| 357 | case FILTER_OP_GE_S64_DOUBLE: |
| 358 | case FILTER_OP_LE_S64_DOUBLE: |
| 359 | case FILTER_OP_BIT_RSHIFT: |
| 360 | case FILTER_OP_BIT_LSHIFT: |
| 361 | case FILTER_OP_BIT_AND: |
| 362 | case FILTER_OP_BIT_OR: |
| 363 | case FILTER_OP_BIT_XOR: |
| 364 | { |
| 365 | if (unlikely(pc + sizeof(struct binary_op) |
| 366 | > start_pc + bytecode->len)) { |
| 367 | ret = -ERANGE; |
| 368 | } |
| 369 | break; |
| 370 | } |
| 371 | |
| 372 | /* unary */ |
| 373 | case FILTER_OP_UNARY_PLUS: |
| 374 | case FILTER_OP_UNARY_MINUS: |
| 375 | case FILTER_OP_UNARY_NOT: |
| 376 | case FILTER_OP_UNARY_PLUS_S64: |
| 377 | case FILTER_OP_UNARY_MINUS_S64: |
| 378 | case FILTER_OP_UNARY_NOT_S64: |
| 379 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 380 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 381 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 382 | case FILTER_OP_UNARY_BIT_NOT: |
| 383 | { |
| 384 | if (unlikely(pc + sizeof(struct unary_op) |
| 385 | > start_pc + bytecode->len)) { |
| 386 | ret = -ERANGE; |
| 387 | } |
| 388 | break; |
| 389 | } |
| 390 | |
| 391 | /* logical */ |
| 392 | case FILTER_OP_AND: |
| 393 | case FILTER_OP_OR: |
| 394 | { |
| 395 | if (unlikely(pc + sizeof(struct logical_op) |
| 396 | > start_pc + bytecode->len)) { |
| 397 | ret = -ERANGE; |
| 398 | } |
| 399 | break; |
| 400 | } |
| 401 | |
| 402 | /* load field ref */ |
| 403 | case FILTER_OP_LOAD_FIELD_REF: |
| 404 | { |
| 405 | ERR("Unknown field ref type\n"); |
| 406 | ret = -EINVAL; |
| 407 | break; |
| 408 | } |
| 409 | |
| 410 | /* get context ref */ |
| 411 | case FILTER_OP_GET_CONTEXT_REF: |
| 412 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 413 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 414 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 415 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 416 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 417 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 418 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 419 | { |
| 420 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) |
| 421 | > start_pc + bytecode->len)) { |
| 422 | ret = -ERANGE; |
| 423 | } |
| 424 | break; |
| 425 | } |
| 426 | |
| 427 | /* load from immediate operand */ |
| 428 | case FILTER_OP_LOAD_STRING: |
| 429 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 430 | { |
| 431 | struct load_op *insn = (struct load_op *) pc; |
| 432 | uint32_t str_len, maxlen; |
| 433 | |
| 434 | if (unlikely(pc + sizeof(struct load_op) |
| 435 | > start_pc + bytecode->len)) { |
| 436 | ret = -ERANGE; |
| 437 | break; |
| 438 | } |
| 439 | |
| 440 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); |
| 441 | str_len = strnlen(insn->data, maxlen); |
| 442 | if (unlikely(str_len >= maxlen)) { |
| 443 | /* Final '\0' not found within range */ |
| 444 | ret = -ERANGE; |
| 445 | } |
| 446 | break; |
| 447 | } |
| 448 | |
| 449 | case FILTER_OP_LOAD_S64: |
| 450 | { |
| 451 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) |
| 452 | > start_pc + bytecode->len)) { |
| 453 | ret = -ERANGE; |
| 454 | } |
| 455 | break; |
| 456 | } |
| 457 | |
| 458 | case FILTER_OP_LOAD_DOUBLE: |
| 459 | { |
| 460 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_double) |
| 461 | > start_pc + bytecode->len)) { |
| 462 | ret = -ERANGE; |
| 463 | } |
| 464 | break; |
| 465 | } |
| 466 | |
| 467 | case FILTER_OP_CAST_TO_S64: |
| 468 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 469 | case FILTER_OP_CAST_NOP: |
| 470 | { |
| 471 | if (unlikely(pc + sizeof(struct cast_op) |
| 472 | > start_pc + bytecode->len)) { |
| 473 | ret = -ERANGE; |
| 474 | } |
| 475 | break; |
| 476 | } |
| 477 | |
| 478 | /* |
| 479 | * Instructions for recursive traversal through composed types. |
| 480 | */ |
| 481 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 482 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 483 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 484 | case FILTER_OP_LOAD_FIELD: |
| 485 | case FILTER_OP_LOAD_FIELD_S8: |
| 486 | case FILTER_OP_LOAD_FIELD_S16: |
| 487 | case FILTER_OP_LOAD_FIELD_S32: |
| 488 | case FILTER_OP_LOAD_FIELD_S64: |
| 489 | case FILTER_OP_LOAD_FIELD_U8: |
| 490 | case FILTER_OP_LOAD_FIELD_U16: |
| 491 | case FILTER_OP_LOAD_FIELD_U32: |
| 492 | case FILTER_OP_LOAD_FIELD_U64: |
| 493 | case FILTER_OP_LOAD_FIELD_STRING: |
| 494 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 495 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 496 | if (unlikely(pc + sizeof(struct load_op) |
| 497 | > start_pc + bytecode->len)) { |
| 498 | ret = -ERANGE; |
| 499 | } |
| 500 | break; |
| 501 | |
| 502 | case FILTER_OP_GET_SYMBOL: |
| 503 | { |
| 504 | struct load_op *insn = (struct load_op *) pc; |
| 505 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 506 | |
| 507 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol) |
| 508 | > start_pc + bytecode->len)) { |
| 509 | ret = -ERANGE; |
| 510 | break; |
| 511 | } |
| 512 | ret = validate_get_symbol(bytecode, sym); |
| 513 | break; |
| 514 | } |
| 515 | |
| 516 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 517 | ERR("Unexpected get symbol field"); |
| 518 | ret = -EINVAL; |
| 519 | break; |
| 520 | |
| 521 | case FILTER_OP_GET_INDEX_U16: |
| 522 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16) |
| 523 | > start_pc + bytecode->len)) { |
| 524 | ret = -ERANGE; |
| 525 | } |
| 526 | break; |
| 527 | |
| 528 | case FILTER_OP_GET_INDEX_U64: |
| 529 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64) |
| 530 | > start_pc + bytecode->len)) { |
| 531 | ret = -ERANGE; |
| 532 | } |
| 533 | break; |
| 534 | } |
| 535 | |
| 536 | return ret; |
| 537 | } |
| 538 | |
| 539 | static |
| 540 | unsigned long delete_all_nodes(struct cds_lfht *ht) |
| 541 | { |
| 542 | struct cds_lfht_iter iter; |
| 543 | struct lfht_mp_node *node; |
| 544 | unsigned long nr_nodes = 0; |
| 545 | |
| 546 | cds_lfht_for_each_entry(ht, &iter, node, node) { |
| 547 | int ret; |
| 548 | |
| 549 | ret = cds_lfht_del(ht, cds_lfht_iter_get_node(&iter)); |
| 550 | assert(!ret); |
| 551 | /* note: this hash table is never used concurrently */ |
| 552 | free(node); |
| 553 | nr_nodes++; |
| 554 | } |
| 555 | return nr_nodes; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Return value: |
| 560 | * >=0: success |
| 561 | * <0: error |
| 562 | */ |
| 563 | static |
| 564 | int validate_instruction_context(struct bytecode_runtime *bytecode, |
| 565 | struct vstack *stack, |
| 566 | char *start_pc, |
| 567 | char *pc) |
| 568 | { |
| 569 | int ret = 0; |
| 570 | const filter_opcode_t opcode = *(filter_opcode_t *) pc; |
| 571 | |
| 572 | switch (opcode) { |
| 573 | case FILTER_OP_UNKNOWN: |
| 574 | default: |
| 575 | { |
| 576 | ERR("unknown bytecode op %u\n", |
| 577 | (unsigned int) *(filter_opcode_t *) pc); |
| 578 | ret = -EINVAL; |
| 579 | goto end; |
| 580 | } |
| 581 | |
| 582 | case FILTER_OP_RETURN: |
| 583 | case FILTER_OP_RETURN_S64: |
| 584 | { |
| 585 | goto end; |
| 586 | } |
| 587 | |
| 588 | /* binary */ |
| 589 | case FILTER_OP_MUL: |
| 590 | case FILTER_OP_DIV: |
| 591 | case FILTER_OP_MOD: |
| 592 | case FILTER_OP_PLUS: |
| 593 | case FILTER_OP_MINUS: |
| 594 | { |
| 595 | ERR("unsupported bytecode op %u\n", |
| 596 | (unsigned int) opcode); |
| 597 | ret = -EINVAL; |
| 598 | goto end; |
| 599 | } |
| 600 | |
| 601 | case FILTER_OP_EQ: |
| 602 | { |
| 603 | ret = bin_op_compare_check(stack, opcode, "=="); |
| 604 | if (ret < 0) |
| 605 | goto end; |
| 606 | break; |
| 607 | } |
| 608 | case FILTER_OP_NE: |
| 609 | { |
| 610 | ret = bin_op_compare_check(stack, opcode, "!="); |
| 611 | if (ret < 0) |
| 612 | goto end; |
| 613 | break; |
| 614 | } |
| 615 | case FILTER_OP_GT: |
| 616 | { |
| 617 | ret = bin_op_compare_check(stack, opcode, ">"); |
| 618 | if (ret < 0) |
| 619 | goto end; |
| 620 | break; |
| 621 | } |
| 622 | case FILTER_OP_LT: |
| 623 | { |
| 624 | ret = bin_op_compare_check(stack, opcode, "<"); |
| 625 | if (ret < 0) |
| 626 | goto end; |
| 627 | break; |
| 628 | } |
| 629 | case FILTER_OP_GE: |
| 630 | { |
| 631 | ret = bin_op_compare_check(stack, opcode, ">="); |
| 632 | if (ret < 0) |
| 633 | goto end; |
| 634 | break; |
| 635 | } |
| 636 | case FILTER_OP_LE: |
| 637 | { |
| 638 | ret = bin_op_compare_check(stack, opcode, "<="); |
| 639 | if (ret < 0) |
| 640 | goto end; |
| 641 | break; |
| 642 | } |
| 643 | |
| 644 | case FILTER_OP_EQ_STRING: |
| 645 | case FILTER_OP_NE_STRING: |
| 646 | case FILTER_OP_GT_STRING: |
| 647 | case FILTER_OP_LT_STRING: |
| 648 | case FILTER_OP_GE_STRING: |
| 649 | case FILTER_OP_LE_STRING: |
| 650 | { |
| 651 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 652 | ERR("Empty stack\n"); |
| 653 | ret = -EINVAL; |
| 654 | goto end; |
| 655 | } |
| 656 | if (vstack_ax(stack)->type != REG_STRING |
| 657 | || vstack_bx(stack)->type != REG_STRING) { |
| 658 | ERR("Unexpected register type for string comparator\n"); |
| 659 | ret = -EINVAL; |
| 660 | goto end; |
| 661 | } |
| 662 | break; |
| 663 | } |
| 664 | |
| 665 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 666 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 667 | { |
| 668 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 669 | ERR("Empty stack\n"); |
| 670 | ret = -EINVAL; |
| 671 | goto end; |
| 672 | } |
| 673 | if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING |
| 674 | && vstack_bx(stack)->type != REG_STAR_GLOB_STRING) { |
| 675 | ERR("Unexpected register type for globbing pattern comparator\n"); |
| 676 | ret = -EINVAL; |
| 677 | goto end; |
| 678 | } |
| 679 | break; |
| 680 | } |
| 681 | |
| 682 | case FILTER_OP_EQ_S64: |
| 683 | case FILTER_OP_NE_S64: |
| 684 | case FILTER_OP_GT_S64: |
| 685 | case FILTER_OP_LT_S64: |
| 686 | case FILTER_OP_GE_S64: |
| 687 | case FILTER_OP_LE_S64: |
| 688 | { |
| 689 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 690 | ERR("Empty stack\n"); |
| 691 | ret = -EINVAL; |
| 692 | goto end; |
| 693 | } |
| 694 | if (vstack_ax(stack)->type != REG_S64 |
| 695 | || vstack_bx(stack)->type != REG_S64) { |
| 696 | ERR("Unexpected register type for s64 comparator\n"); |
| 697 | ret = -EINVAL; |
| 698 | goto end; |
| 699 | } |
| 700 | break; |
| 701 | } |
| 702 | |
| 703 | case FILTER_OP_EQ_DOUBLE: |
| 704 | case FILTER_OP_NE_DOUBLE: |
| 705 | case FILTER_OP_GT_DOUBLE: |
| 706 | case FILTER_OP_LT_DOUBLE: |
| 707 | case FILTER_OP_GE_DOUBLE: |
| 708 | case FILTER_OP_LE_DOUBLE: |
| 709 | { |
| 710 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 711 | ERR("Empty stack\n"); |
| 712 | ret = -EINVAL; |
| 713 | goto end; |
| 714 | } |
| 715 | if (vstack_ax(stack)->type != REG_DOUBLE && vstack_bx(stack)->type != REG_DOUBLE) { |
| 716 | ERR("Double operator should have two double registers\n"); |
| 717 | ret = -EINVAL; |
| 718 | goto end; |
| 719 | } |
| 720 | break; |
| 721 | } |
| 722 | |
| 723 | case FILTER_OP_EQ_DOUBLE_S64: |
| 724 | case FILTER_OP_NE_DOUBLE_S64: |
| 725 | case FILTER_OP_GT_DOUBLE_S64: |
| 726 | case FILTER_OP_LT_DOUBLE_S64: |
| 727 | case FILTER_OP_GE_DOUBLE_S64: |
| 728 | case FILTER_OP_LE_DOUBLE_S64: |
| 729 | { |
| 730 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 731 | ERR("Empty stack\n"); |
| 732 | ret = -EINVAL; |
| 733 | goto end; |
| 734 | } |
| 735 | if (vstack_ax(stack)->type != REG_S64 && vstack_bx(stack)->type != REG_DOUBLE) { |
| 736 | ERR("Double-S64 operator has unexpected register types\n"); |
| 737 | ret = -EINVAL; |
| 738 | goto end; |
| 739 | } |
| 740 | break; |
| 741 | } |
| 742 | |
| 743 | case FILTER_OP_EQ_S64_DOUBLE: |
| 744 | case FILTER_OP_NE_S64_DOUBLE: |
| 745 | case FILTER_OP_GT_S64_DOUBLE: |
| 746 | case FILTER_OP_LT_S64_DOUBLE: |
| 747 | case FILTER_OP_GE_S64_DOUBLE: |
| 748 | case FILTER_OP_LE_S64_DOUBLE: |
| 749 | { |
| 750 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 751 | ERR("Empty stack\n"); |
| 752 | ret = -EINVAL; |
| 753 | goto end; |
| 754 | } |
| 755 | if (vstack_ax(stack)->type != REG_DOUBLE && vstack_bx(stack)->type != REG_S64) { |
| 756 | ERR("S64-Double operator has unexpected register types\n"); |
| 757 | ret = -EINVAL; |
| 758 | goto end; |
| 759 | } |
| 760 | break; |
| 761 | } |
| 762 | |
| 763 | case FILTER_OP_BIT_RSHIFT: |
| 764 | ret = bin_op_bitwise_check(stack, opcode, ">>"); |
| 765 | if (ret < 0) |
| 766 | goto end; |
| 767 | break; |
| 768 | case FILTER_OP_BIT_LSHIFT: |
| 769 | ret = bin_op_bitwise_check(stack, opcode, "<<"); |
| 770 | if (ret < 0) |
| 771 | goto end; |
| 772 | break; |
| 773 | case FILTER_OP_BIT_AND: |
| 774 | ret = bin_op_bitwise_check(stack, opcode, "&"); |
| 775 | if (ret < 0) |
| 776 | goto end; |
| 777 | break; |
| 778 | case FILTER_OP_BIT_OR: |
| 779 | ret = bin_op_bitwise_check(stack, opcode, "|"); |
| 780 | if (ret < 0) |
| 781 | goto end; |
| 782 | break; |
| 783 | case FILTER_OP_BIT_XOR: |
| 784 | ret = bin_op_bitwise_check(stack, opcode, "^"); |
| 785 | if (ret < 0) |
| 786 | goto end; |
| 787 | break; |
| 788 | |
| 789 | /* unary */ |
| 790 | case FILTER_OP_UNARY_PLUS: |
| 791 | case FILTER_OP_UNARY_MINUS: |
| 792 | case FILTER_OP_UNARY_NOT: |
| 793 | { |
| 794 | if (!vstack_ax(stack)) { |
| 795 | ERR("Empty stack\n"); |
| 796 | ret = -EINVAL; |
| 797 | goto end; |
| 798 | } |
| 799 | switch (vstack_ax(stack)->type) { |
| 800 | default: |
| 801 | ERR("unknown register type\n"); |
| 802 | ret = -EINVAL; |
| 803 | goto end; |
| 804 | |
| 805 | case REG_STRING: |
| 806 | case REG_STAR_GLOB_STRING: |
| 807 | ERR("Unary op can only be applied to numeric or floating point registers\n"); |
| 808 | ret = -EINVAL; |
| 809 | goto end; |
| 810 | case REG_S64: |
| 811 | break; |
| 812 | case REG_DOUBLE: |
| 813 | break; |
| 814 | case REG_UNKNOWN: |
| 815 | break; |
| 816 | } |
| 817 | break; |
| 818 | } |
| 819 | case FILTER_OP_UNARY_BIT_NOT: |
| 820 | { |
| 821 | if (!vstack_ax(stack)) { |
| 822 | ERR("Empty stack\n"); |
| 823 | ret = -EINVAL; |
| 824 | goto end; |
| 825 | } |
| 826 | switch (vstack_ax(stack)->type) { |
| 827 | default: |
| 828 | ERR("unknown register type\n"); |
| 829 | ret = -EINVAL; |
| 830 | goto end; |
| 831 | |
| 832 | case REG_STRING: |
| 833 | case REG_STAR_GLOB_STRING: |
| 834 | case REG_DOUBLE: |
| 835 | ERR("Unary bitwise op can only be applied to numeric registers\n"); |
| 836 | ret = -EINVAL; |
| 837 | goto end; |
| 838 | case REG_S64: |
| 839 | break; |
| 840 | case REG_UNKNOWN: |
| 841 | break; |
| 842 | } |
| 843 | break; |
| 844 | } |
| 845 | |
| 846 | case FILTER_OP_UNARY_PLUS_S64: |
| 847 | case FILTER_OP_UNARY_MINUS_S64: |
| 848 | case FILTER_OP_UNARY_NOT_S64: |
| 849 | { |
| 850 | if (!vstack_ax(stack)) { |
| 851 | ERR("Empty stack\n"); |
| 852 | ret = -EINVAL; |
| 853 | goto end; |
| 854 | } |
| 855 | if (vstack_ax(stack)->type != REG_S64) { |
| 856 | ERR("Invalid register type\n"); |
| 857 | ret = -EINVAL; |
| 858 | goto end; |
| 859 | } |
| 860 | break; |
| 861 | } |
| 862 | |
| 863 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 864 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 865 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 866 | { |
| 867 | if (!vstack_ax(stack)) { |
| 868 | ERR("Empty stack\n"); |
| 869 | ret = -EINVAL; |
| 870 | goto end; |
| 871 | } |
| 872 | if (vstack_ax(stack)->type != REG_DOUBLE) { |
| 873 | ERR("Invalid register type\n"); |
| 874 | ret = -EINVAL; |
| 875 | goto end; |
| 876 | } |
| 877 | break; |
| 878 | } |
| 879 | |
| 880 | /* logical */ |
| 881 | case FILTER_OP_AND: |
| 882 | case FILTER_OP_OR: |
| 883 | { |
| 884 | struct logical_op *insn = (struct logical_op *) pc; |
| 885 | |
| 886 | if (!vstack_ax(stack)) { |
| 887 | ERR("Empty stack\n"); |
| 888 | ret = -EINVAL; |
| 889 | goto end; |
| 890 | } |
| 891 | if (vstack_ax(stack)->type != REG_S64 |
| 892 | && vstack_ax(stack)->type != REG_UNKNOWN) { |
| 893 | ERR("Logical comparator expects S64 or dynamic register\n"); |
| 894 | ret = -EINVAL; |
| 895 | goto end; |
| 896 | } |
| 897 | |
| 898 | dbg_printf("Validate jumping to bytecode offset %u\n", |
| 899 | (unsigned int) insn->skip_offset); |
| 900 | if (unlikely(start_pc + insn->skip_offset <= pc)) { |
| 901 | ERR("Loops are not allowed in bytecode\n"); |
| 902 | ret = -EINVAL; |
| 903 | goto end; |
| 904 | } |
| 905 | break; |
| 906 | } |
| 907 | |
| 908 | /* load field ref */ |
| 909 | case FILTER_OP_LOAD_FIELD_REF: |
| 910 | { |
| 911 | ERR("Unknown field ref type\n"); |
| 912 | ret = -EINVAL; |
| 913 | goto end; |
| 914 | } |
| 915 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 916 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 917 | { |
| 918 | struct load_op *insn = (struct load_op *) pc; |
| 919 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 920 | |
| 921 | dbg_printf("Validate load field ref offset %u type string\n", |
| 922 | ref->offset); |
| 923 | break; |
| 924 | } |
| 925 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 926 | { |
| 927 | struct load_op *insn = (struct load_op *) pc; |
| 928 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 929 | |
| 930 | dbg_printf("Validate load field ref offset %u type s64\n", |
| 931 | ref->offset); |
| 932 | break; |
| 933 | } |
| 934 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 935 | { |
| 936 | struct load_op *insn = (struct load_op *) pc; |
| 937 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 938 | |
| 939 | dbg_printf("Validate load field ref offset %u type double\n", |
| 940 | ref->offset); |
| 941 | break; |
| 942 | } |
| 943 | |
| 944 | /* load from immediate operand */ |
| 945 | case FILTER_OP_LOAD_STRING: |
| 946 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 947 | { |
| 948 | break; |
| 949 | } |
| 950 | |
| 951 | case FILTER_OP_LOAD_S64: |
| 952 | { |
| 953 | break; |
| 954 | } |
| 955 | |
| 956 | case FILTER_OP_LOAD_DOUBLE: |
| 957 | { |
| 958 | break; |
| 959 | } |
| 960 | |
| 961 | case FILTER_OP_CAST_TO_S64: |
| 962 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 963 | { |
| 964 | struct cast_op *insn = (struct cast_op *) pc; |
| 965 | |
| 966 | if (!vstack_ax(stack)) { |
| 967 | ERR("Empty stack\n"); |
| 968 | ret = -EINVAL; |
| 969 | goto end; |
| 970 | } |
| 971 | switch (vstack_ax(stack)->type) { |
| 972 | default: |
| 973 | ERR("unknown register type\n"); |
| 974 | ret = -EINVAL; |
| 975 | goto end; |
| 976 | |
| 977 | case REG_STRING: |
| 978 | case REG_STAR_GLOB_STRING: |
| 979 | ERR("Cast op can only be applied to numeric or floating point registers\n"); |
| 980 | ret = -EINVAL; |
| 981 | goto end; |
| 982 | case REG_S64: |
| 983 | break; |
| 984 | case REG_DOUBLE: |
| 985 | break; |
| 986 | case REG_UNKNOWN: |
| 987 | break; |
| 988 | } |
| 989 | if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) { |
| 990 | if (vstack_ax(stack)->type != REG_DOUBLE) { |
| 991 | ERR("Cast expects double\n"); |
| 992 | ret = -EINVAL; |
| 993 | goto end; |
| 994 | } |
| 995 | } |
| 996 | break; |
| 997 | } |
| 998 | case FILTER_OP_CAST_NOP: |
| 999 | { |
| 1000 | break; |
| 1001 | } |
| 1002 | |
| 1003 | /* get context ref */ |
| 1004 | case FILTER_OP_GET_CONTEXT_REF: |
| 1005 | { |
| 1006 | struct load_op *insn = (struct load_op *) pc; |
| 1007 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 1008 | |
| 1009 | dbg_printf("Validate get context ref offset %u type dynamic\n", |
| 1010 | ref->offset); |
| 1011 | break; |
| 1012 | } |
| 1013 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 1014 | { |
| 1015 | struct load_op *insn = (struct load_op *) pc; |
| 1016 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 1017 | |
| 1018 | dbg_printf("Validate get context ref offset %u type string\n", |
| 1019 | ref->offset); |
| 1020 | break; |
| 1021 | } |
| 1022 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 1023 | { |
| 1024 | struct load_op *insn = (struct load_op *) pc; |
| 1025 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 1026 | |
| 1027 | dbg_printf("Validate get context ref offset %u type s64\n", |
| 1028 | ref->offset); |
| 1029 | break; |
| 1030 | } |
| 1031 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 1032 | { |
| 1033 | struct load_op *insn = (struct load_op *) pc; |
| 1034 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 1035 | |
| 1036 | dbg_printf("Validate get context ref offset %u type double\n", |
| 1037 | ref->offset); |
| 1038 | break; |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * Instructions for recursive traversal through composed types. |
| 1043 | */ |
| 1044 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 1045 | { |
| 1046 | dbg_printf("Validate get context root\n"); |
| 1047 | break; |
| 1048 | } |
| 1049 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 1050 | { |
| 1051 | dbg_printf("Validate get app context root\n"); |
| 1052 | break; |
| 1053 | } |
| 1054 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 1055 | { |
| 1056 | dbg_printf("Validate get payload root\n"); |
| 1057 | break; |
| 1058 | } |
| 1059 | case FILTER_OP_LOAD_FIELD: |
| 1060 | { |
| 1061 | /* |
| 1062 | * We tolerate that field type is unknown at validation, |
| 1063 | * because we are performing the load specialization in |
| 1064 | * a phase after validation. |
| 1065 | */ |
| 1066 | dbg_printf("Validate load field\n"); |
| 1067 | break; |
| 1068 | } |
| 1069 | case FILTER_OP_LOAD_FIELD_S8: |
| 1070 | { |
| 1071 | dbg_printf("Validate load field s8\n"); |
| 1072 | break; |
| 1073 | } |
| 1074 | case FILTER_OP_LOAD_FIELD_S16: |
| 1075 | { |
| 1076 | dbg_printf("Validate load field s16\n"); |
| 1077 | break; |
| 1078 | } |
| 1079 | case FILTER_OP_LOAD_FIELD_S32: |
| 1080 | { |
| 1081 | dbg_printf("Validate load field s32\n"); |
| 1082 | break; |
| 1083 | } |
| 1084 | case FILTER_OP_LOAD_FIELD_S64: |
| 1085 | { |
| 1086 | dbg_printf("Validate load field s64\n"); |
| 1087 | break; |
| 1088 | } |
| 1089 | case FILTER_OP_LOAD_FIELD_U8: |
| 1090 | { |
| 1091 | dbg_printf("Validate load field u8\n"); |
| 1092 | break; |
| 1093 | } |
| 1094 | case FILTER_OP_LOAD_FIELD_U16: |
| 1095 | { |
| 1096 | dbg_printf("Validate load field u16\n"); |
| 1097 | break; |
| 1098 | } |
| 1099 | case FILTER_OP_LOAD_FIELD_U32: |
| 1100 | { |
| 1101 | dbg_printf("Validate load field u32\n"); |
| 1102 | break; |
| 1103 | } |
| 1104 | case FILTER_OP_LOAD_FIELD_U64: |
| 1105 | { |
| 1106 | dbg_printf("Validate load field u64\n"); |
| 1107 | break; |
| 1108 | } |
| 1109 | case FILTER_OP_LOAD_FIELD_STRING: |
| 1110 | { |
| 1111 | dbg_printf("Validate load field string\n"); |
| 1112 | break; |
| 1113 | } |
| 1114 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 1115 | { |
| 1116 | dbg_printf("Validate load field sequence\n"); |
| 1117 | break; |
| 1118 | } |
| 1119 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 1120 | { |
| 1121 | dbg_printf("Validate load field double\n"); |
| 1122 | break; |
| 1123 | } |
| 1124 | |
| 1125 | case FILTER_OP_GET_SYMBOL: |
| 1126 | { |
| 1127 | struct load_op *insn = (struct load_op *) pc; |
| 1128 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 1129 | |
| 1130 | dbg_printf("Validate get symbol offset %u\n", sym->offset); |
| 1131 | break; |
| 1132 | } |
| 1133 | |
| 1134 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 1135 | { |
| 1136 | struct load_op *insn = (struct load_op *) pc; |
| 1137 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 1138 | |
| 1139 | dbg_printf("Validate get symbol field offset %u\n", sym->offset); |
| 1140 | break; |
| 1141 | } |
| 1142 | |
| 1143 | case FILTER_OP_GET_INDEX_U16: |
| 1144 | { |
| 1145 | struct load_op *insn = (struct load_op *) pc; |
| 1146 | struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data; |
| 1147 | |
| 1148 | dbg_printf("Validate get index u16 index %u\n", get_index->index); |
| 1149 | break; |
| 1150 | } |
| 1151 | |
| 1152 | case FILTER_OP_GET_INDEX_U64: |
| 1153 | { |
| 1154 | struct load_op *insn = (struct load_op *) pc; |
| 1155 | struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data; |
| 1156 | |
| 1157 | dbg_printf("Validate get index u64 index %" PRIu64 "\n", get_index->index); |
| 1158 | break; |
| 1159 | } |
| 1160 | } |
| 1161 | end: |
| 1162 | return ret; |
| 1163 | } |
| 1164 | |
| 1165 | /* |
| 1166 | * Return value: |
| 1167 | * 0: success |
| 1168 | * <0: error |
| 1169 | */ |
| 1170 | static |
| 1171 | int validate_instruction_all_contexts(struct bytecode_runtime *bytecode, |
| 1172 | struct cds_lfht *merge_points, |
| 1173 | struct vstack *stack, |
| 1174 | char *start_pc, |
| 1175 | char *pc) |
| 1176 | { |
| 1177 | int ret; |
| 1178 | unsigned long target_pc = pc - start_pc; |
| 1179 | struct cds_lfht_iter iter; |
| 1180 | struct cds_lfht_node *node; |
| 1181 | struct lfht_mp_node *mp_node; |
| 1182 | unsigned long hash; |
| 1183 | |
| 1184 | /* Validate the context resulting from the previous instruction */ |
| 1185 | ret = validate_instruction_context(bytecode, stack, start_pc, pc); |
| 1186 | if (ret < 0) |
| 1187 | return ret; |
| 1188 | |
| 1189 | /* Validate merge points */ |
| 1190 | hash = lttng_hash_mix((const char *) target_pc, sizeof(target_pc), |
| 1191 | lttng_hash_seed); |
| 1192 | cds_lfht_lookup(merge_points, hash, lttng_hash_match, |
| 1193 | (const char *) target_pc, &iter); |
| 1194 | node = cds_lfht_iter_get_node(&iter); |
| 1195 | if (node) { |
| 1196 | mp_node = caa_container_of(node, struct lfht_mp_node, node); |
| 1197 | |
| 1198 | dbg_printf("Filter: validate merge point at offset %lu\n", |
| 1199 | target_pc); |
| 1200 | if (merge_points_compare(stack, &mp_node->stack)) { |
| 1201 | ERR("Merge points differ for offset %lu\n", |
| 1202 | target_pc); |
| 1203 | return -EINVAL; |
| 1204 | } |
| 1205 | /* Once validated, we can remove the merge point */ |
| 1206 | dbg_printf("Filter: remove merge point at offset %lu\n", |
| 1207 | target_pc); |
| 1208 | ret = cds_lfht_del(merge_points, node); |
| 1209 | assert(!ret); |
| 1210 | } |
| 1211 | return 0; |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * Return value: |
| 1216 | * >0: going to next insn. |
| 1217 | * 0: success, stop iteration. |
| 1218 | * <0: error |
| 1219 | */ |
| 1220 | static |
| 1221 | int exec_insn(struct bytecode_runtime *bytecode, |
| 1222 | struct cds_lfht *merge_points, |
| 1223 | struct vstack *stack, |
| 1224 | char **_next_pc, |
| 1225 | char *pc) |
| 1226 | { |
| 1227 | int ret = 1; |
| 1228 | char *next_pc = *_next_pc; |
| 1229 | |
| 1230 | switch (*(filter_opcode_t *) pc) { |
| 1231 | case FILTER_OP_UNKNOWN: |
| 1232 | default: |
| 1233 | { |
| 1234 | ERR("unknown bytecode op %u\n", |
| 1235 | (unsigned int) *(filter_opcode_t *) pc); |
| 1236 | ret = -EINVAL; |
| 1237 | goto end; |
| 1238 | } |
| 1239 | |
| 1240 | case FILTER_OP_RETURN: |
| 1241 | { |
| 1242 | if (!vstack_ax(stack)) { |
| 1243 | ERR("Empty stack\n"); |
| 1244 | ret = -EINVAL; |
| 1245 | goto end; |
| 1246 | } |
| 1247 | switch (vstack_ax(stack)->type) { |
| 1248 | case REG_S64: |
| 1249 | case REG_UNKNOWN: |
| 1250 | break; |
| 1251 | default: |
| 1252 | ERR("Unexpected register type %d at end of bytecode\n", |
| 1253 | (int) vstack_ax(stack)->type); |
| 1254 | ret = -EINVAL; |
| 1255 | goto end; |
| 1256 | } |
| 1257 | |
| 1258 | ret = 0; |
| 1259 | goto end; |
| 1260 | } |
| 1261 | case FILTER_OP_RETURN_S64: |
| 1262 | { |
| 1263 | if (!vstack_ax(stack)) { |
| 1264 | ERR("Empty stack\n"); |
| 1265 | ret = -EINVAL; |
| 1266 | goto end; |
| 1267 | } |
| 1268 | switch (vstack_ax(stack)->type) { |
| 1269 | case REG_S64: |
| 1270 | break; |
| 1271 | default: |
| 1272 | case REG_UNKNOWN: |
| 1273 | ERR("Unexpected register type %d at end of bytecode\n", |
| 1274 | (int) vstack_ax(stack)->type); |
| 1275 | ret = -EINVAL; |
| 1276 | goto end; |
| 1277 | } |
| 1278 | |
| 1279 | ret = 0; |
| 1280 | goto end; |
| 1281 | } |
| 1282 | |
| 1283 | /* binary */ |
| 1284 | case FILTER_OP_MUL: |
| 1285 | case FILTER_OP_DIV: |
| 1286 | case FILTER_OP_MOD: |
| 1287 | case FILTER_OP_PLUS: |
| 1288 | case FILTER_OP_MINUS: |
| 1289 | { |
| 1290 | ERR("unsupported bytecode op %u\n", |
| 1291 | (unsigned int) *(filter_opcode_t *) pc); |
| 1292 | ret = -EINVAL; |
| 1293 | goto end; |
| 1294 | } |
| 1295 | |
| 1296 | case FILTER_OP_EQ: |
| 1297 | case FILTER_OP_NE: |
| 1298 | case FILTER_OP_GT: |
| 1299 | case FILTER_OP_LT: |
| 1300 | case FILTER_OP_GE: |
| 1301 | case FILTER_OP_LE: |
| 1302 | case FILTER_OP_EQ_STRING: |
| 1303 | case FILTER_OP_NE_STRING: |
| 1304 | case FILTER_OP_GT_STRING: |
| 1305 | case FILTER_OP_LT_STRING: |
| 1306 | case FILTER_OP_GE_STRING: |
| 1307 | case FILTER_OP_LE_STRING: |
| 1308 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 1309 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 1310 | case FILTER_OP_EQ_S64: |
| 1311 | case FILTER_OP_NE_S64: |
| 1312 | case FILTER_OP_GT_S64: |
| 1313 | case FILTER_OP_LT_S64: |
| 1314 | case FILTER_OP_GE_S64: |
| 1315 | case FILTER_OP_LE_S64: |
| 1316 | case FILTER_OP_EQ_DOUBLE: |
| 1317 | case FILTER_OP_NE_DOUBLE: |
| 1318 | case FILTER_OP_GT_DOUBLE: |
| 1319 | case FILTER_OP_LT_DOUBLE: |
| 1320 | case FILTER_OP_GE_DOUBLE: |
| 1321 | case FILTER_OP_LE_DOUBLE: |
| 1322 | case FILTER_OP_EQ_DOUBLE_S64: |
| 1323 | case FILTER_OP_NE_DOUBLE_S64: |
| 1324 | case FILTER_OP_GT_DOUBLE_S64: |
| 1325 | case FILTER_OP_LT_DOUBLE_S64: |
| 1326 | case FILTER_OP_GE_DOUBLE_S64: |
| 1327 | case FILTER_OP_LE_DOUBLE_S64: |
| 1328 | case FILTER_OP_EQ_S64_DOUBLE: |
| 1329 | case FILTER_OP_NE_S64_DOUBLE: |
| 1330 | case FILTER_OP_GT_S64_DOUBLE: |
| 1331 | case FILTER_OP_LT_S64_DOUBLE: |
| 1332 | case FILTER_OP_GE_S64_DOUBLE: |
| 1333 | case FILTER_OP_LE_S64_DOUBLE: |
| 1334 | case FILTER_OP_BIT_RSHIFT: |
| 1335 | case FILTER_OP_BIT_LSHIFT: |
| 1336 | case FILTER_OP_BIT_AND: |
| 1337 | case FILTER_OP_BIT_OR: |
| 1338 | case FILTER_OP_BIT_XOR: |
| 1339 | { |
| 1340 | /* Pop 2, push 1 */ |
| 1341 | if (vstack_pop(stack)) { |
| 1342 | ret = -EINVAL; |
| 1343 | goto end; |
| 1344 | } |
| 1345 | if (!vstack_ax(stack)) { |
| 1346 | ERR("Empty stack\n"); |
| 1347 | ret = -EINVAL; |
| 1348 | goto end; |
| 1349 | } |
| 1350 | switch (vstack_ax(stack)->type) { |
| 1351 | case REG_S64: |
| 1352 | case REG_DOUBLE: |
| 1353 | case REG_STRING: |
| 1354 | case REG_STAR_GLOB_STRING: |
| 1355 | case REG_UNKNOWN: |
| 1356 | break; |
| 1357 | default: |
| 1358 | ERR("Unexpected register type %d for operation\n", |
| 1359 | (int) vstack_ax(stack)->type); |
| 1360 | ret = -EINVAL; |
| 1361 | goto end; |
| 1362 | } |
| 1363 | |
| 1364 | vstack_ax(stack)->type = REG_S64; |
| 1365 | next_pc += sizeof(struct binary_op); |
| 1366 | break; |
| 1367 | } |
| 1368 | |
| 1369 | /* unary */ |
| 1370 | case FILTER_OP_UNARY_PLUS: |
| 1371 | case FILTER_OP_UNARY_MINUS: |
| 1372 | { |
| 1373 | /* Pop 1, push 1 */ |
| 1374 | if (!vstack_ax(stack)) { |
| 1375 | ERR("Empty stack\n"); |
| 1376 | ret = -EINVAL; |
| 1377 | goto end; |
| 1378 | } |
| 1379 | switch (vstack_ax(stack)->type) { |
| 1380 | case REG_UNKNOWN: |
| 1381 | case REG_DOUBLE: |
| 1382 | case REG_S64: |
| 1383 | break; |
| 1384 | default: |
| 1385 | ERR("Unexpected register type %d for operation\n", |
| 1386 | (int) vstack_ax(stack)->type); |
| 1387 | ret = -EINVAL; |
| 1388 | goto end; |
| 1389 | } |
| 1390 | vstack_ax(stack)->type = REG_UNKNOWN; |
| 1391 | next_pc += sizeof(struct unary_op); |
| 1392 | break; |
| 1393 | } |
| 1394 | |
| 1395 | case FILTER_OP_UNARY_PLUS_S64: |
| 1396 | case FILTER_OP_UNARY_MINUS_S64: |
| 1397 | case FILTER_OP_UNARY_NOT_S64: |
| 1398 | { |
| 1399 | /* Pop 1, push 1 */ |
| 1400 | if (!vstack_ax(stack)) { |
| 1401 | ERR("Empty stack\n"); |
| 1402 | ret = -EINVAL; |
| 1403 | goto end; |
| 1404 | } |
| 1405 | switch (vstack_ax(stack)->type) { |
| 1406 | case REG_S64: |
| 1407 | break; |
| 1408 | default: |
| 1409 | ERR("Unexpected register type %d for operation\n", |
| 1410 | (int) vstack_ax(stack)->type); |
| 1411 | ret = -EINVAL; |
| 1412 | goto end; |
| 1413 | } |
| 1414 | |
| 1415 | vstack_ax(stack)->type = REG_S64; |
| 1416 | next_pc += sizeof(struct unary_op); |
| 1417 | break; |
| 1418 | } |
| 1419 | |
| 1420 | case FILTER_OP_UNARY_NOT: |
| 1421 | { |
| 1422 | /* Pop 1, push 1 */ |
| 1423 | if (!vstack_ax(stack)) { |
| 1424 | ERR("Empty stack\n"); |
| 1425 | ret = -EINVAL; |
| 1426 | goto end; |
| 1427 | } |
| 1428 | switch (vstack_ax(stack)->type) { |
| 1429 | case REG_UNKNOWN: |
| 1430 | case REG_DOUBLE: |
| 1431 | case REG_S64: |
| 1432 | break; |
| 1433 | default: |
| 1434 | ERR("Unexpected register type %d for operation\n", |
| 1435 | (int) vstack_ax(stack)->type); |
| 1436 | ret = -EINVAL; |
| 1437 | goto end; |
| 1438 | } |
| 1439 | |
| 1440 | vstack_ax(stack)->type = REG_S64; |
| 1441 | next_pc += sizeof(struct unary_op); |
| 1442 | break; |
| 1443 | } |
| 1444 | |
| 1445 | case FILTER_OP_UNARY_BIT_NOT: |
| 1446 | { |
| 1447 | /* Pop 1, push 1 */ |
| 1448 | if (!vstack_ax(stack)) { |
| 1449 | ERR("Empty stack\n"); |
| 1450 | ret = -EINVAL; |
| 1451 | goto end; |
| 1452 | } |
| 1453 | switch (vstack_ax(stack)->type) { |
| 1454 | case REG_UNKNOWN: |
| 1455 | case REG_S64: |
| 1456 | break; |
| 1457 | case REG_DOUBLE: |
| 1458 | default: |
| 1459 | ERR("Unexpected register type %d for operation\n", |
| 1460 | (int) vstack_ax(stack)->type); |
| 1461 | ret = -EINVAL; |
| 1462 | goto end; |
| 1463 | } |
| 1464 | |
| 1465 | vstack_ax(stack)->type = REG_S64; |
| 1466 | next_pc += sizeof(struct unary_op); |
| 1467 | break; |
| 1468 | } |
| 1469 | |
| 1470 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 1471 | { |
| 1472 | /* Pop 1, push 1 */ |
| 1473 | if (!vstack_ax(stack)) { |
| 1474 | ERR("Empty stack\n"); |
| 1475 | ret = -EINVAL; |
| 1476 | goto end; |
| 1477 | } |
| 1478 | switch (vstack_ax(stack)->type) { |
| 1479 | case REG_DOUBLE: |
| 1480 | break; |
| 1481 | default: |
| 1482 | ERR("Incorrect register type %d for operation\n", |
| 1483 | (int) vstack_ax(stack)->type); |
| 1484 | ret = -EINVAL; |
| 1485 | goto end; |
| 1486 | } |
| 1487 | |
| 1488 | vstack_ax(stack)->type = REG_S64; |
| 1489 | next_pc += sizeof(struct unary_op); |
| 1490 | break; |
| 1491 | } |
| 1492 | |
| 1493 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 1494 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 1495 | { |
| 1496 | /* Pop 1, push 1 */ |
| 1497 | if (!vstack_ax(stack)) { |
| 1498 | ERR("Empty stack\n"); |
| 1499 | ret = -EINVAL; |
| 1500 | goto end; |
| 1501 | } |
| 1502 | switch (vstack_ax(stack)->type) { |
| 1503 | case REG_DOUBLE: |
| 1504 | break; |
| 1505 | default: |
| 1506 | ERR("Incorrect register type %d for operation\n", |
| 1507 | (int) vstack_ax(stack)->type); |
| 1508 | ret = -EINVAL; |
| 1509 | goto end; |
| 1510 | } |
| 1511 | |
| 1512 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1513 | next_pc += sizeof(struct unary_op); |
| 1514 | break; |
| 1515 | } |
| 1516 | |
| 1517 | /* logical */ |
| 1518 | case FILTER_OP_AND: |
| 1519 | case FILTER_OP_OR: |
| 1520 | { |
| 1521 | struct logical_op *insn = (struct logical_op *) pc; |
| 1522 | int merge_ret; |
| 1523 | |
| 1524 | /* Add merge point to table */ |
| 1525 | merge_ret = merge_point_add_check(merge_points, |
| 1526 | insn->skip_offset, stack); |
| 1527 | if (merge_ret) { |
| 1528 | ret = merge_ret; |
| 1529 | goto end; |
| 1530 | } |
| 1531 | |
| 1532 | if (!vstack_ax(stack)) { |
| 1533 | ERR("Empty stack\n"); |
| 1534 | ret = -EINVAL; |
| 1535 | goto end; |
| 1536 | } |
| 1537 | /* There is always a cast-to-s64 operation before a or/and op. */ |
| 1538 | switch (vstack_ax(stack)->type) { |
| 1539 | case REG_S64: |
| 1540 | break; |
| 1541 | default: |
| 1542 | ERR("Incorrect register type %d for operation\n", |
| 1543 | (int) vstack_ax(stack)->type); |
| 1544 | ret = -EINVAL; |
| 1545 | goto end; |
| 1546 | } |
| 1547 | |
| 1548 | /* Continue to next instruction */ |
| 1549 | /* Pop 1 when jump not taken */ |
| 1550 | if (vstack_pop(stack)) { |
| 1551 | ret = -EINVAL; |
| 1552 | goto end; |
| 1553 | } |
| 1554 | next_pc += sizeof(struct logical_op); |
| 1555 | break; |
| 1556 | } |
| 1557 | |
| 1558 | /* load field ref */ |
| 1559 | case FILTER_OP_LOAD_FIELD_REF: |
| 1560 | { |
| 1561 | ERR("Unknown field ref type\n"); |
| 1562 | ret = -EINVAL; |
| 1563 | goto end; |
| 1564 | } |
| 1565 | /* get context ref */ |
| 1566 | case FILTER_OP_GET_CONTEXT_REF: |
| 1567 | { |
| 1568 | if (vstack_push(stack)) { |
| 1569 | ret = -EINVAL; |
| 1570 | goto end; |
| 1571 | } |
| 1572 | vstack_ax(stack)->type = REG_UNKNOWN; |
| 1573 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1574 | break; |
| 1575 | } |
| 1576 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 1577 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 1578 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 1579 | { |
| 1580 | if (vstack_push(stack)) { |
| 1581 | ret = -EINVAL; |
| 1582 | goto end; |
| 1583 | } |
| 1584 | vstack_ax(stack)->type = REG_STRING; |
| 1585 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1586 | break; |
| 1587 | } |
| 1588 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 1589 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 1590 | { |
| 1591 | if (vstack_push(stack)) { |
| 1592 | ret = -EINVAL; |
| 1593 | goto end; |
| 1594 | } |
| 1595 | vstack_ax(stack)->type = REG_S64; |
| 1596 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1597 | break; |
| 1598 | } |
| 1599 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 1600 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 1601 | { |
| 1602 | if (vstack_push(stack)) { |
| 1603 | ret = -EINVAL; |
| 1604 | goto end; |
| 1605 | } |
| 1606 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1607 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1608 | break; |
| 1609 | } |
| 1610 | |
| 1611 | /* load from immediate operand */ |
| 1612 | case FILTER_OP_LOAD_STRING: |
| 1613 | { |
| 1614 | struct load_op *insn = (struct load_op *) pc; |
| 1615 | |
| 1616 | if (vstack_push(stack)) { |
| 1617 | ret = -EINVAL; |
| 1618 | goto end; |
| 1619 | } |
| 1620 | vstack_ax(stack)->type = REG_STRING; |
| 1621 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 1622 | break; |
| 1623 | } |
| 1624 | |
| 1625 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 1626 | { |
| 1627 | struct load_op *insn = (struct load_op *) pc; |
| 1628 | |
| 1629 | if (vstack_push(stack)) { |
| 1630 | ret = -EINVAL; |
| 1631 | goto end; |
| 1632 | } |
| 1633 | vstack_ax(stack)->type = REG_STAR_GLOB_STRING; |
| 1634 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 1635 | break; |
| 1636 | } |
| 1637 | |
| 1638 | case FILTER_OP_LOAD_S64: |
| 1639 | { |
| 1640 | if (vstack_push(stack)) { |
| 1641 | ret = -EINVAL; |
| 1642 | goto end; |
| 1643 | } |
| 1644 | vstack_ax(stack)->type = REG_S64; |
| 1645 | next_pc += sizeof(struct load_op) |
| 1646 | + sizeof(struct literal_numeric); |
| 1647 | break; |
| 1648 | } |
| 1649 | |
| 1650 | case FILTER_OP_LOAD_DOUBLE: |
| 1651 | { |
| 1652 | if (vstack_push(stack)) { |
| 1653 | ret = -EINVAL; |
| 1654 | goto end; |
| 1655 | } |
| 1656 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1657 | next_pc += sizeof(struct load_op) |
| 1658 | + sizeof(struct literal_double); |
| 1659 | break; |
| 1660 | } |
| 1661 | |
| 1662 | case FILTER_OP_CAST_TO_S64: |
| 1663 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 1664 | { |
| 1665 | /* Pop 1, push 1 */ |
| 1666 | if (!vstack_ax(stack)) { |
| 1667 | ERR("Empty stack\n"); |
| 1668 | ret = -EINVAL; |
| 1669 | goto end; |
| 1670 | } |
| 1671 | switch (vstack_ax(stack)->type) { |
| 1672 | case REG_S64: |
| 1673 | case REG_DOUBLE: |
| 1674 | case REG_UNKNOWN: |
| 1675 | break; |
| 1676 | default: |
| 1677 | ERR("Incorrect register type %d for cast\n", |
| 1678 | (int) vstack_ax(stack)->type); |
| 1679 | ret = -EINVAL; |
| 1680 | goto end; |
| 1681 | } |
| 1682 | vstack_ax(stack)->type = REG_S64; |
| 1683 | next_pc += sizeof(struct cast_op); |
| 1684 | break; |
| 1685 | } |
| 1686 | case FILTER_OP_CAST_NOP: |
| 1687 | { |
| 1688 | next_pc += sizeof(struct cast_op); |
| 1689 | break; |
| 1690 | } |
| 1691 | |
| 1692 | /* |
| 1693 | * Instructions for recursive traversal through composed types. |
| 1694 | */ |
| 1695 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 1696 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 1697 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 1698 | { |
| 1699 | if (vstack_push(stack)) { |
| 1700 | ret = -EINVAL; |
| 1701 | goto end; |
| 1702 | } |
| 1703 | vstack_ax(stack)->type = REG_PTR; |
| 1704 | next_pc += sizeof(struct load_op); |
| 1705 | break; |
| 1706 | } |
| 1707 | |
| 1708 | case FILTER_OP_LOAD_FIELD: |
| 1709 | { |
| 1710 | /* Pop 1, push 1 */ |
| 1711 | if (!vstack_ax(stack)) { |
| 1712 | ERR("Empty stack\n"); |
| 1713 | ret = -EINVAL; |
| 1714 | goto end; |
| 1715 | } |
| 1716 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1717 | ERR("Expecting pointer on top of stack\n"); |
| 1718 | ret = -EINVAL; |
| 1719 | goto end; |
| 1720 | } |
| 1721 | vstack_ax(stack)->type = REG_UNKNOWN; |
| 1722 | next_pc += sizeof(struct load_op); |
| 1723 | break; |
| 1724 | } |
| 1725 | |
| 1726 | case FILTER_OP_LOAD_FIELD_S8: |
| 1727 | case FILTER_OP_LOAD_FIELD_S16: |
| 1728 | case FILTER_OP_LOAD_FIELD_S32: |
| 1729 | case FILTER_OP_LOAD_FIELD_S64: |
| 1730 | case FILTER_OP_LOAD_FIELD_U8: |
| 1731 | case FILTER_OP_LOAD_FIELD_U16: |
| 1732 | case FILTER_OP_LOAD_FIELD_U32: |
| 1733 | case FILTER_OP_LOAD_FIELD_U64: |
| 1734 | { |
| 1735 | /* Pop 1, push 1 */ |
| 1736 | if (!vstack_ax(stack)) { |
| 1737 | ERR("Empty stack\n"); |
| 1738 | ret = -EINVAL; |
| 1739 | goto end; |
| 1740 | } |
| 1741 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1742 | ERR("Expecting pointer on top of stack\n"); |
| 1743 | ret = -EINVAL; |
| 1744 | goto end; |
| 1745 | } |
| 1746 | vstack_ax(stack)->type = REG_S64; |
| 1747 | next_pc += sizeof(struct load_op); |
| 1748 | break; |
| 1749 | } |
| 1750 | |
| 1751 | case FILTER_OP_LOAD_FIELD_STRING: |
| 1752 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 1753 | { |
| 1754 | /* Pop 1, push 1 */ |
| 1755 | if (!vstack_ax(stack)) { |
| 1756 | ERR("Empty stack\n"); |
| 1757 | ret = -EINVAL; |
| 1758 | goto end; |
| 1759 | } |
| 1760 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1761 | ERR("Expecting pointer on top of stack\n"); |
| 1762 | ret = -EINVAL; |
| 1763 | goto end; |
| 1764 | } |
| 1765 | vstack_ax(stack)->type = REG_STRING; |
| 1766 | next_pc += sizeof(struct load_op); |
| 1767 | break; |
| 1768 | } |
| 1769 | |
| 1770 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 1771 | { |
| 1772 | /* Pop 1, push 1 */ |
| 1773 | if (!vstack_ax(stack)) { |
| 1774 | ERR("Empty stack\n"); |
| 1775 | ret = -EINVAL; |
| 1776 | goto end; |
| 1777 | } |
| 1778 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1779 | ERR("Expecting pointer on top of stack\n"); |
| 1780 | ret = -EINVAL; |
| 1781 | goto end; |
| 1782 | } |
| 1783 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1784 | next_pc += sizeof(struct load_op); |
| 1785 | break; |
| 1786 | } |
| 1787 | |
| 1788 | case FILTER_OP_GET_SYMBOL: |
| 1789 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 1790 | { |
| 1791 | /* Pop 1, push 1 */ |
| 1792 | if (!vstack_ax(stack)) { |
| 1793 | ERR("Empty stack\n"); |
| 1794 | ret = -EINVAL; |
| 1795 | goto end; |
| 1796 | } |
| 1797 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1798 | ERR("Expecting pointer on top of stack\n"); |
| 1799 | ret = -EINVAL; |
| 1800 | goto end; |
| 1801 | } |
| 1802 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); |
| 1803 | break; |
| 1804 | } |
| 1805 | |
| 1806 | case FILTER_OP_GET_INDEX_U16: |
| 1807 | { |
| 1808 | /* Pop 1, push 1 */ |
| 1809 | if (!vstack_ax(stack)) { |
| 1810 | ERR("Empty stack\n"); |
| 1811 | ret = -EINVAL; |
| 1812 | goto end; |
| 1813 | } |
| 1814 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1815 | ERR("Expecting pointer on top of stack\n"); |
| 1816 | ret = -EINVAL; |
| 1817 | goto end; |
| 1818 | } |
| 1819 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); |
| 1820 | break; |
| 1821 | } |
| 1822 | |
| 1823 | case FILTER_OP_GET_INDEX_U64: |
| 1824 | { |
| 1825 | /* Pop 1, push 1 */ |
| 1826 | if (!vstack_ax(stack)) { |
| 1827 | ERR("Empty stack\n"); |
| 1828 | ret = -EINVAL; |
| 1829 | goto end; |
| 1830 | } |
| 1831 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1832 | ERR("Expecting pointer on top of stack\n"); |
| 1833 | ret = -EINVAL; |
| 1834 | goto end; |
| 1835 | } |
| 1836 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); |
| 1837 | break; |
| 1838 | } |
| 1839 | |
| 1840 | } |
| 1841 | end: |
| 1842 | *_next_pc = next_pc; |
| 1843 | return ret; |
| 1844 | } |
| 1845 | |
| 1846 | /* |
| 1847 | * Never called concurrently (hash seed is shared). |
| 1848 | */ |
| 1849 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) |
| 1850 | { |
| 1851 | struct cds_lfht *merge_points; |
| 1852 | char *pc, *next_pc, *start_pc; |
| 1853 | int ret = -EINVAL; |
| 1854 | struct vstack stack; |
| 1855 | |
| 1856 | vstack_init(&stack); |
| 1857 | |
| 1858 | if (!lttng_hash_seed_ready) { |
| 1859 | lttng_hash_seed = time(NULL); |
| 1860 | lttng_hash_seed_ready = 1; |
| 1861 | } |
| 1862 | /* |
| 1863 | * Note: merge_points hash table used by single thread, and |
| 1864 | * never concurrently resized. Therefore, we can use it without |
| 1865 | * holding RCU read-side lock and free nodes without using |
| 1866 | * call_rcu. |
| 1867 | */ |
| 1868 | merge_points = cds_lfht_new(DEFAULT_NR_MERGE_POINTS, |
| 1869 | MIN_NR_BUCKETS, MAX_NR_BUCKETS, |
| 1870 | 0, NULL); |
| 1871 | if (!merge_points) { |
| 1872 | ERR("Error allocating hash table for bytecode validation\n"); |
| 1873 | return -ENOMEM; |
| 1874 | } |
| 1875 | start_pc = &bytecode->code[0]; |
| 1876 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
| 1877 | pc = next_pc) { |
| 1878 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); |
| 1879 | if (ret != 0) { |
| 1880 | if (ret == -ERANGE) |
| 1881 | ERR("filter bytecode overflow\n"); |
| 1882 | goto end; |
| 1883 | } |
| 1884 | dbg_printf("Validating op %s (%u)\n", |
| 1885 | print_op((unsigned int) *(filter_opcode_t *) pc), |
| 1886 | (unsigned int) *(filter_opcode_t *) pc); |
| 1887 | |
| 1888 | /* |
| 1889 | * For each instruction, validate the current context |
| 1890 | * (traversal of entire execution flow), and validate |
| 1891 | * all merge points targeting this instruction. |
| 1892 | */ |
| 1893 | ret = validate_instruction_all_contexts(bytecode, merge_points, |
| 1894 | &stack, start_pc, pc); |
| 1895 | if (ret) |
| 1896 | goto end; |
| 1897 | ret = exec_insn(bytecode, merge_points, &stack, &next_pc, pc); |
| 1898 | if (ret <= 0) |
| 1899 | goto end; |
| 1900 | } |
| 1901 | end: |
| 1902 | if (delete_all_nodes(merge_points)) { |
| 1903 | if (!ret) { |
| 1904 | ERR("Unexpected merge points\n"); |
| 1905 | ret = -EINVAL; |
| 1906 | } |
| 1907 | } |
| 1908 | if (cds_lfht_destroy(merge_points, NULL)) { |
| 1909 | ERR("Error destroying hash table\n"); |
| 1910 | } |
| 1911 | return ret; |
| 1912 | } |