| 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 | { |
| 300 | if (unlikely(pc + sizeof(struct return_op) |
| 301 | > start_pc + bytecode->len)) { |
| 302 | ret = -ERANGE; |
| 303 | } |
| 304 | break; |
| 305 | } |
| 306 | |
| 307 | /* binary */ |
| 308 | case FILTER_OP_MUL: |
| 309 | case FILTER_OP_DIV: |
| 310 | case FILTER_OP_MOD: |
| 311 | case FILTER_OP_PLUS: |
| 312 | case FILTER_OP_MINUS: |
| 313 | case FILTER_OP_RSHIFT: |
| 314 | case FILTER_OP_LSHIFT: |
| 315 | { |
| 316 | ERR("unsupported bytecode op %u\n", |
| 317 | (unsigned int) *(filter_opcode_t *) pc); |
| 318 | ret = -EINVAL; |
| 319 | break; |
| 320 | } |
| 321 | |
| 322 | case FILTER_OP_EQ: |
| 323 | case FILTER_OP_NE: |
| 324 | case FILTER_OP_GT: |
| 325 | case FILTER_OP_LT: |
| 326 | case FILTER_OP_GE: |
| 327 | case FILTER_OP_LE: |
| 328 | case FILTER_OP_EQ_STRING: |
| 329 | case FILTER_OP_NE_STRING: |
| 330 | case FILTER_OP_GT_STRING: |
| 331 | case FILTER_OP_LT_STRING: |
| 332 | case FILTER_OP_GE_STRING: |
| 333 | case FILTER_OP_LE_STRING: |
| 334 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 335 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 336 | case FILTER_OP_EQ_S64: |
| 337 | case FILTER_OP_NE_S64: |
| 338 | case FILTER_OP_GT_S64: |
| 339 | case FILTER_OP_LT_S64: |
| 340 | case FILTER_OP_GE_S64: |
| 341 | case FILTER_OP_LE_S64: |
| 342 | case FILTER_OP_EQ_DOUBLE: |
| 343 | case FILTER_OP_NE_DOUBLE: |
| 344 | case FILTER_OP_GT_DOUBLE: |
| 345 | case FILTER_OP_LT_DOUBLE: |
| 346 | case FILTER_OP_GE_DOUBLE: |
| 347 | case FILTER_OP_LE_DOUBLE: |
| 348 | case FILTER_OP_EQ_DOUBLE_S64: |
| 349 | case FILTER_OP_NE_DOUBLE_S64: |
| 350 | case FILTER_OP_GT_DOUBLE_S64: |
| 351 | case FILTER_OP_LT_DOUBLE_S64: |
| 352 | case FILTER_OP_GE_DOUBLE_S64: |
| 353 | case FILTER_OP_LE_DOUBLE_S64: |
| 354 | case FILTER_OP_EQ_S64_DOUBLE: |
| 355 | case FILTER_OP_NE_S64_DOUBLE: |
| 356 | case FILTER_OP_GT_S64_DOUBLE: |
| 357 | case FILTER_OP_LT_S64_DOUBLE: |
| 358 | case FILTER_OP_GE_S64_DOUBLE: |
| 359 | case FILTER_OP_LE_S64_DOUBLE: |
| 360 | case FILTER_OP_BIT_AND: |
| 361 | case FILTER_OP_BIT_OR: |
| 362 | case FILTER_OP_BIT_XOR: |
| 363 | { |
| 364 | if (unlikely(pc + sizeof(struct binary_op) |
| 365 | > start_pc + bytecode->len)) { |
| 366 | ret = -ERANGE; |
| 367 | } |
| 368 | break; |
| 369 | } |
| 370 | |
| 371 | /* unary */ |
| 372 | case FILTER_OP_UNARY_PLUS: |
| 373 | case FILTER_OP_UNARY_MINUS: |
| 374 | case FILTER_OP_UNARY_NOT: |
| 375 | case FILTER_OP_UNARY_PLUS_S64: |
| 376 | case FILTER_OP_UNARY_MINUS_S64: |
| 377 | case FILTER_OP_UNARY_NOT_S64: |
| 378 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 379 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 380 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 381 | { |
| 382 | if (unlikely(pc + sizeof(struct unary_op) |
| 383 | > start_pc + bytecode->len)) { |
| 384 | ret = -ERANGE; |
| 385 | } |
| 386 | break; |
| 387 | } |
| 388 | |
| 389 | /* logical */ |
| 390 | case FILTER_OP_AND: |
| 391 | case FILTER_OP_OR: |
| 392 | { |
| 393 | if (unlikely(pc + sizeof(struct logical_op) |
| 394 | > start_pc + bytecode->len)) { |
| 395 | ret = -ERANGE; |
| 396 | } |
| 397 | break; |
| 398 | } |
| 399 | |
| 400 | /* load field ref */ |
| 401 | case FILTER_OP_LOAD_FIELD_REF: |
| 402 | { |
| 403 | ERR("Unknown field ref type\n"); |
| 404 | ret = -EINVAL; |
| 405 | break; |
| 406 | } |
| 407 | |
| 408 | /* get context ref */ |
| 409 | case FILTER_OP_GET_CONTEXT_REF: |
| 410 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 411 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 412 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 413 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 414 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 415 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 416 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 417 | { |
| 418 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) |
| 419 | > start_pc + bytecode->len)) { |
| 420 | ret = -ERANGE; |
| 421 | } |
| 422 | break; |
| 423 | } |
| 424 | |
| 425 | /* load from immediate operand */ |
| 426 | case FILTER_OP_LOAD_STRING: |
| 427 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 428 | { |
| 429 | struct load_op *insn = (struct load_op *) pc; |
| 430 | uint32_t str_len, maxlen; |
| 431 | |
| 432 | if (unlikely(pc + sizeof(struct load_op) |
| 433 | > start_pc + bytecode->len)) { |
| 434 | ret = -ERANGE; |
| 435 | break; |
| 436 | } |
| 437 | |
| 438 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); |
| 439 | str_len = strnlen(insn->data, maxlen); |
| 440 | if (unlikely(str_len >= maxlen)) { |
| 441 | /* Final '\0' not found within range */ |
| 442 | ret = -ERANGE; |
| 443 | } |
| 444 | break; |
| 445 | } |
| 446 | |
| 447 | case FILTER_OP_LOAD_S64: |
| 448 | { |
| 449 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) |
| 450 | > start_pc + bytecode->len)) { |
| 451 | ret = -ERANGE; |
| 452 | } |
| 453 | break; |
| 454 | } |
| 455 | |
| 456 | case FILTER_OP_LOAD_DOUBLE: |
| 457 | { |
| 458 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_double) |
| 459 | > start_pc + bytecode->len)) { |
| 460 | ret = -ERANGE; |
| 461 | } |
| 462 | break; |
| 463 | } |
| 464 | |
| 465 | case FILTER_OP_CAST_TO_S64: |
| 466 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 467 | case FILTER_OP_CAST_NOP: |
| 468 | { |
| 469 | if (unlikely(pc + sizeof(struct cast_op) |
| 470 | > start_pc + bytecode->len)) { |
| 471 | ret = -ERANGE; |
| 472 | } |
| 473 | break; |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Instructions for recursive traversal through composed types. |
| 478 | */ |
| 479 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 480 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 481 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 482 | case FILTER_OP_LOAD_FIELD: |
| 483 | case FILTER_OP_LOAD_FIELD_S8: |
| 484 | case FILTER_OP_LOAD_FIELD_S16: |
| 485 | case FILTER_OP_LOAD_FIELD_S32: |
| 486 | case FILTER_OP_LOAD_FIELD_S64: |
| 487 | case FILTER_OP_LOAD_FIELD_U8: |
| 488 | case FILTER_OP_LOAD_FIELD_U16: |
| 489 | case FILTER_OP_LOAD_FIELD_U32: |
| 490 | case FILTER_OP_LOAD_FIELD_U64: |
| 491 | case FILTER_OP_LOAD_FIELD_STRING: |
| 492 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 493 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 494 | if (unlikely(pc + sizeof(struct load_op) |
| 495 | > start_pc + bytecode->len)) { |
| 496 | ret = -ERANGE; |
| 497 | } |
| 498 | break; |
| 499 | |
| 500 | case FILTER_OP_GET_SYMBOL: |
| 501 | { |
| 502 | struct load_op *insn = (struct load_op *) pc; |
| 503 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 504 | |
| 505 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol) |
| 506 | > start_pc + bytecode->len)) { |
| 507 | ret = -ERANGE; |
| 508 | } |
| 509 | ret = validate_get_symbol(bytecode, sym); |
| 510 | break; |
| 511 | } |
| 512 | |
| 513 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 514 | ERR("Unexpected get symbol field"); |
| 515 | ret = -EINVAL; |
| 516 | break; |
| 517 | |
| 518 | case FILTER_OP_GET_INDEX_U16: |
| 519 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16) |
| 520 | > start_pc + bytecode->len)) { |
| 521 | ret = -ERANGE; |
| 522 | } |
| 523 | break; |
| 524 | |
| 525 | case FILTER_OP_GET_INDEX_U64: |
| 526 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64) |
| 527 | > start_pc + bytecode->len)) { |
| 528 | ret = -ERANGE; |
| 529 | } |
| 530 | break; |
| 531 | } |
| 532 | |
| 533 | return ret; |
| 534 | } |
| 535 | |
| 536 | static |
| 537 | unsigned long delete_all_nodes(struct cds_lfht *ht) |
| 538 | { |
| 539 | struct cds_lfht_iter iter; |
| 540 | struct lfht_mp_node *node; |
| 541 | unsigned long nr_nodes = 0; |
| 542 | |
| 543 | cds_lfht_for_each_entry(ht, &iter, node, node) { |
| 544 | int ret; |
| 545 | |
| 546 | ret = cds_lfht_del(ht, cds_lfht_iter_get_node(&iter)); |
| 547 | assert(!ret); |
| 548 | /* note: this hash table is never used concurrently */ |
| 549 | free(node); |
| 550 | nr_nodes++; |
| 551 | } |
| 552 | return nr_nodes; |
| 553 | } |
| 554 | |
| 555 | /* |
| 556 | * Return value: |
| 557 | * >=0: success |
| 558 | * <0: error |
| 559 | */ |
| 560 | static |
| 561 | int validate_instruction_context(struct bytecode_runtime *bytecode, |
| 562 | struct vstack *stack, |
| 563 | char *start_pc, |
| 564 | char *pc) |
| 565 | { |
| 566 | int ret = 0; |
| 567 | const filter_opcode_t opcode = *(filter_opcode_t *) pc; |
| 568 | |
| 569 | switch (opcode) { |
| 570 | case FILTER_OP_UNKNOWN: |
| 571 | default: |
| 572 | { |
| 573 | ERR("unknown bytecode op %u\n", |
| 574 | (unsigned int) *(filter_opcode_t *) pc); |
| 575 | ret = -EINVAL; |
| 576 | goto end; |
| 577 | } |
| 578 | |
| 579 | case FILTER_OP_RETURN: |
| 580 | { |
| 581 | goto end; |
| 582 | } |
| 583 | |
| 584 | /* binary */ |
| 585 | case FILTER_OP_MUL: |
| 586 | case FILTER_OP_DIV: |
| 587 | case FILTER_OP_MOD: |
| 588 | case FILTER_OP_PLUS: |
| 589 | case FILTER_OP_MINUS: |
| 590 | case FILTER_OP_RSHIFT: |
| 591 | case FILTER_OP_LSHIFT: |
| 592 | { |
| 593 | ERR("unsupported bytecode op %u\n", |
| 594 | (unsigned int) opcode); |
| 595 | ret = -EINVAL; |
| 596 | goto end; |
| 597 | } |
| 598 | |
| 599 | case FILTER_OP_EQ: |
| 600 | { |
| 601 | ret = bin_op_compare_check(stack, opcode, "=="); |
| 602 | if (ret < 0) |
| 603 | goto end; |
| 604 | break; |
| 605 | } |
| 606 | case FILTER_OP_NE: |
| 607 | { |
| 608 | ret = bin_op_compare_check(stack, opcode, "!="); |
| 609 | if (ret < 0) |
| 610 | goto end; |
| 611 | break; |
| 612 | } |
| 613 | case FILTER_OP_GT: |
| 614 | { |
| 615 | ret = bin_op_compare_check(stack, opcode, ">"); |
| 616 | if (ret < 0) |
| 617 | goto end; |
| 618 | break; |
| 619 | } |
| 620 | case FILTER_OP_LT: |
| 621 | { |
| 622 | ret = bin_op_compare_check(stack, opcode, "<"); |
| 623 | if (ret < 0) |
| 624 | goto end; |
| 625 | break; |
| 626 | } |
| 627 | case FILTER_OP_GE: |
| 628 | { |
| 629 | ret = bin_op_compare_check(stack, opcode, ">="); |
| 630 | if (ret < 0) |
| 631 | goto end; |
| 632 | break; |
| 633 | } |
| 634 | case FILTER_OP_LE: |
| 635 | { |
| 636 | ret = bin_op_compare_check(stack, opcode, "<="); |
| 637 | if (ret < 0) |
| 638 | goto end; |
| 639 | break; |
| 640 | } |
| 641 | |
| 642 | case FILTER_OP_EQ_STRING: |
| 643 | case FILTER_OP_NE_STRING: |
| 644 | case FILTER_OP_GT_STRING: |
| 645 | case FILTER_OP_LT_STRING: |
| 646 | case FILTER_OP_GE_STRING: |
| 647 | case FILTER_OP_LE_STRING: |
| 648 | { |
| 649 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 650 | ERR("Empty stack\n"); |
| 651 | ret = -EINVAL; |
| 652 | goto end; |
| 653 | } |
| 654 | if (vstack_ax(stack)->type != REG_STRING |
| 655 | || vstack_bx(stack)->type != REG_STRING) { |
| 656 | ERR("Unexpected register type for string comparator\n"); |
| 657 | ret = -EINVAL; |
| 658 | goto end; |
| 659 | } |
| 660 | break; |
| 661 | } |
| 662 | |
| 663 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 664 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 665 | { |
| 666 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 667 | ERR("Empty stack\n"); |
| 668 | ret = -EINVAL; |
| 669 | goto end; |
| 670 | } |
| 671 | if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING |
| 672 | && vstack_bx(stack)->type != REG_STAR_GLOB_STRING) { |
| 673 | ERR("Unexpected register type for globbing pattern comparator\n"); |
| 674 | ret = -EINVAL; |
| 675 | goto end; |
| 676 | } |
| 677 | break; |
| 678 | } |
| 679 | |
| 680 | case FILTER_OP_EQ_S64: |
| 681 | case FILTER_OP_NE_S64: |
| 682 | case FILTER_OP_GT_S64: |
| 683 | case FILTER_OP_LT_S64: |
| 684 | case FILTER_OP_GE_S64: |
| 685 | case FILTER_OP_LE_S64: |
| 686 | { |
| 687 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 688 | ERR("Empty stack\n"); |
| 689 | ret = -EINVAL; |
| 690 | goto end; |
| 691 | } |
| 692 | if (vstack_ax(stack)->type != REG_S64 |
| 693 | || vstack_bx(stack)->type != REG_S64) { |
| 694 | ERR("Unexpected register type for s64 comparator\n"); |
| 695 | ret = -EINVAL; |
| 696 | goto end; |
| 697 | } |
| 698 | break; |
| 699 | } |
| 700 | |
| 701 | case FILTER_OP_EQ_DOUBLE: |
| 702 | case FILTER_OP_NE_DOUBLE: |
| 703 | case FILTER_OP_GT_DOUBLE: |
| 704 | case FILTER_OP_LT_DOUBLE: |
| 705 | case FILTER_OP_GE_DOUBLE: |
| 706 | case FILTER_OP_LE_DOUBLE: |
| 707 | { |
| 708 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 709 | ERR("Empty stack\n"); |
| 710 | ret = -EINVAL; |
| 711 | goto end; |
| 712 | } |
| 713 | if (vstack_ax(stack)->type != REG_DOUBLE && vstack_bx(stack)->type != REG_DOUBLE) { |
| 714 | ERR("Double operator should have two double registers\n"); |
| 715 | ret = -EINVAL; |
| 716 | goto end; |
| 717 | } |
| 718 | break; |
| 719 | } |
| 720 | |
| 721 | case FILTER_OP_EQ_DOUBLE_S64: |
| 722 | case FILTER_OP_NE_DOUBLE_S64: |
| 723 | case FILTER_OP_GT_DOUBLE_S64: |
| 724 | case FILTER_OP_LT_DOUBLE_S64: |
| 725 | case FILTER_OP_GE_DOUBLE_S64: |
| 726 | case FILTER_OP_LE_DOUBLE_S64: |
| 727 | { |
| 728 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 729 | ERR("Empty stack\n"); |
| 730 | ret = -EINVAL; |
| 731 | goto end; |
| 732 | } |
| 733 | if (vstack_ax(stack)->type != REG_S64 && vstack_bx(stack)->type != REG_DOUBLE) { |
| 734 | ERR("Double-S64 operator has unexpected register types\n"); |
| 735 | ret = -EINVAL; |
| 736 | goto end; |
| 737 | } |
| 738 | break; |
| 739 | } |
| 740 | |
| 741 | case FILTER_OP_EQ_S64_DOUBLE: |
| 742 | case FILTER_OP_NE_S64_DOUBLE: |
| 743 | case FILTER_OP_GT_S64_DOUBLE: |
| 744 | case FILTER_OP_LT_S64_DOUBLE: |
| 745 | case FILTER_OP_GE_S64_DOUBLE: |
| 746 | case FILTER_OP_LE_S64_DOUBLE: |
| 747 | { |
| 748 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 749 | ERR("Empty stack\n"); |
| 750 | ret = -EINVAL; |
| 751 | goto end; |
| 752 | } |
| 753 | if (vstack_ax(stack)->type != REG_DOUBLE && vstack_bx(stack)->type != REG_S64) { |
| 754 | ERR("S64-Double operator has unexpected register types\n"); |
| 755 | ret = -EINVAL; |
| 756 | goto end; |
| 757 | } |
| 758 | break; |
| 759 | } |
| 760 | |
| 761 | case FILTER_OP_BIT_AND: |
| 762 | ret = bin_op_bitwise_check(stack, opcode, "&"); |
| 763 | if (ret < 0) |
| 764 | goto end; |
| 765 | break; |
| 766 | case FILTER_OP_BIT_OR: |
| 767 | ret = bin_op_bitwise_check(stack, opcode, "|"); |
| 768 | if (ret < 0) |
| 769 | goto end; |
| 770 | break; |
| 771 | case FILTER_OP_BIT_XOR: |
| 772 | ret = bin_op_bitwise_check(stack, opcode, "^"); |
| 773 | if (ret < 0) |
| 774 | goto end; |
| 775 | break; |
| 776 | |
| 777 | /* unary */ |
| 778 | case FILTER_OP_UNARY_PLUS: |
| 779 | case FILTER_OP_UNARY_MINUS: |
| 780 | case FILTER_OP_UNARY_NOT: |
| 781 | { |
| 782 | if (!vstack_ax(stack)) { |
| 783 | ERR("Empty stack\n"); |
| 784 | ret = -EINVAL; |
| 785 | goto end; |
| 786 | } |
| 787 | switch (vstack_ax(stack)->type) { |
| 788 | default: |
| 789 | ERR("unknown register type\n"); |
| 790 | ret = -EINVAL; |
| 791 | goto end; |
| 792 | |
| 793 | case REG_STRING: |
| 794 | case REG_STAR_GLOB_STRING: |
| 795 | ERR("Unary op can only be applied to numeric or floating point registers\n"); |
| 796 | ret = -EINVAL; |
| 797 | goto end; |
| 798 | case REG_S64: |
| 799 | break; |
| 800 | case REG_DOUBLE: |
| 801 | break; |
| 802 | case REG_UNKNOWN: |
| 803 | break; |
| 804 | } |
| 805 | break; |
| 806 | } |
| 807 | |
| 808 | case FILTER_OP_UNARY_PLUS_S64: |
| 809 | case FILTER_OP_UNARY_MINUS_S64: |
| 810 | case FILTER_OP_UNARY_NOT_S64: |
| 811 | { |
| 812 | if (!vstack_ax(stack)) { |
| 813 | ERR("Empty stack\n"); |
| 814 | ret = -EINVAL; |
| 815 | goto end; |
| 816 | } |
| 817 | if (vstack_ax(stack)->type != REG_S64) { |
| 818 | ERR("Invalid register type\n"); |
| 819 | ret = -EINVAL; |
| 820 | goto end; |
| 821 | } |
| 822 | break; |
| 823 | } |
| 824 | |
| 825 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 826 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 827 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 828 | { |
| 829 | if (!vstack_ax(stack)) { |
| 830 | ERR("Empty stack\n"); |
| 831 | ret = -EINVAL; |
| 832 | goto end; |
| 833 | } |
| 834 | if (vstack_ax(stack)->type != REG_DOUBLE) { |
| 835 | ERR("Invalid register type\n"); |
| 836 | ret = -EINVAL; |
| 837 | goto end; |
| 838 | } |
| 839 | break; |
| 840 | } |
| 841 | |
| 842 | /* logical */ |
| 843 | case FILTER_OP_AND: |
| 844 | case FILTER_OP_OR: |
| 845 | { |
| 846 | struct logical_op *insn = (struct logical_op *) pc; |
| 847 | |
| 848 | if (!vstack_ax(stack)) { |
| 849 | ERR("Empty stack\n"); |
| 850 | ret = -EINVAL; |
| 851 | goto end; |
| 852 | } |
| 853 | if (vstack_ax(stack)->type != REG_S64 |
| 854 | && vstack_ax(stack)->type != REG_UNKNOWN) { |
| 855 | ERR("Logical comparator expects S64 or dynamic register\n"); |
| 856 | ret = -EINVAL; |
| 857 | goto end; |
| 858 | } |
| 859 | |
| 860 | dbg_printf("Validate jumping to bytecode offset %u\n", |
| 861 | (unsigned int) insn->skip_offset); |
| 862 | if (unlikely(start_pc + insn->skip_offset <= pc)) { |
| 863 | ERR("Loops are not allowed in bytecode\n"); |
| 864 | ret = -EINVAL; |
| 865 | goto end; |
| 866 | } |
| 867 | break; |
| 868 | } |
| 869 | |
| 870 | /* load field ref */ |
| 871 | case FILTER_OP_LOAD_FIELD_REF: |
| 872 | { |
| 873 | ERR("Unknown field ref type\n"); |
| 874 | ret = -EINVAL; |
| 875 | goto end; |
| 876 | } |
| 877 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 878 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 879 | { |
| 880 | struct load_op *insn = (struct load_op *) pc; |
| 881 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 882 | |
| 883 | dbg_printf("Validate load field ref offset %u type string\n", |
| 884 | ref->offset); |
| 885 | break; |
| 886 | } |
| 887 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 888 | { |
| 889 | struct load_op *insn = (struct load_op *) pc; |
| 890 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 891 | |
| 892 | dbg_printf("Validate load field ref offset %u type s64\n", |
| 893 | ref->offset); |
| 894 | break; |
| 895 | } |
| 896 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 897 | { |
| 898 | struct load_op *insn = (struct load_op *) pc; |
| 899 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 900 | |
| 901 | dbg_printf("Validate load field ref offset %u type double\n", |
| 902 | ref->offset); |
| 903 | break; |
| 904 | } |
| 905 | |
| 906 | /* load from immediate operand */ |
| 907 | case FILTER_OP_LOAD_STRING: |
| 908 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 909 | { |
| 910 | break; |
| 911 | } |
| 912 | |
| 913 | case FILTER_OP_LOAD_S64: |
| 914 | { |
| 915 | break; |
| 916 | } |
| 917 | |
| 918 | case FILTER_OP_LOAD_DOUBLE: |
| 919 | { |
| 920 | break; |
| 921 | } |
| 922 | |
| 923 | case FILTER_OP_CAST_TO_S64: |
| 924 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 925 | { |
| 926 | struct cast_op *insn = (struct cast_op *) pc; |
| 927 | |
| 928 | if (!vstack_ax(stack)) { |
| 929 | ERR("Empty stack\n"); |
| 930 | ret = -EINVAL; |
| 931 | goto end; |
| 932 | } |
| 933 | switch (vstack_ax(stack)->type) { |
| 934 | default: |
| 935 | ERR("unknown register type\n"); |
| 936 | ret = -EINVAL; |
| 937 | goto end; |
| 938 | |
| 939 | case REG_STRING: |
| 940 | case REG_STAR_GLOB_STRING: |
| 941 | ERR("Cast op can only be applied to numeric or floating point registers\n"); |
| 942 | ret = -EINVAL; |
| 943 | goto end; |
| 944 | case REG_S64: |
| 945 | break; |
| 946 | case REG_DOUBLE: |
| 947 | break; |
| 948 | case REG_UNKNOWN: |
| 949 | break; |
| 950 | } |
| 951 | if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) { |
| 952 | if (vstack_ax(stack)->type != REG_DOUBLE) { |
| 953 | ERR("Cast expects double\n"); |
| 954 | ret = -EINVAL; |
| 955 | goto end; |
| 956 | } |
| 957 | } |
| 958 | break; |
| 959 | } |
| 960 | case FILTER_OP_CAST_NOP: |
| 961 | { |
| 962 | break; |
| 963 | } |
| 964 | |
| 965 | /* get context ref */ |
| 966 | case FILTER_OP_GET_CONTEXT_REF: |
| 967 | { |
| 968 | struct load_op *insn = (struct load_op *) pc; |
| 969 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 970 | |
| 971 | dbg_printf("Validate get context ref offset %u type dynamic\n", |
| 972 | ref->offset); |
| 973 | break; |
| 974 | } |
| 975 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 976 | { |
| 977 | struct load_op *insn = (struct load_op *) pc; |
| 978 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 979 | |
| 980 | dbg_printf("Validate get context ref offset %u type string\n", |
| 981 | ref->offset); |
| 982 | break; |
| 983 | } |
| 984 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 985 | { |
| 986 | struct load_op *insn = (struct load_op *) pc; |
| 987 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 988 | |
| 989 | dbg_printf("Validate get context ref offset %u type s64\n", |
| 990 | ref->offset); |
| 991 | break; |
| 992 | } |
| 993 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 994 | { |
| 995 | struct load_op *insn = (struct load_op *) pc; |
| 996 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 997 | |
| 998 | dbg_printf("Validate get context ref offset %u type double\n", |
| 999 | ref->offset); |
| 1000 | break; |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * Instructions for recursive traversal through composed types. |
| 1005 | */ |
| 1006 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 1007 | { |
| 1008 | dbg_printf("Validate get context root\n"); |
| 1009 | break; |
| 1010 | } |
| 1011 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 1012 | { |
| 1013 | dbg_printf("Validate get app context root\n"); |
| 1014 | break; |
| 1015 | } |
| 1016 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 1017 | { |
| 1018 | dbg_printf("Validate get payload root\n"); |
| 1019 | break; |
| 1020 | } |
| 1021 | case FILTER_OP_LOAD_FIELD: |
| 1022 | { |
| 1023 | /* |
| 1024 | * We tolerate that field type is unknown at validation, |
| 1025 | * because we are performing the load specialization in |
| 1026 | * a phase after validation. |
| 1027 | */ |
| 1028 | dbg_printf("Validate load field\n"); |
| 1029 | break; |
| 1030 | } |
| 1031 | case FILTER_OP_LOAD_FIELD_S8: |
| 1032 | { |
| 1033 | dbg_printf("Validate load field s8\n"); |
| 1034 | break; |
| 1035 | } |
| 1036 | case FILTER_OP_LOAD_FIELD_S16: |
| 1037 | { |
| 1038 | dbg_printf("Validate load field s16\n"); |
| 1039 | break; |
| 1040 | } |
| 1041 | case FILTER_OP_LOAD_FIELD_S32: |
| 1042 | { |
| 1043 | dbg_printf("Validate load field s32\n"); |
| 1044 | break; |
| 1045 | } |
| 1046 | case FILTER_OP_LOAD_FIELD_S64: |
| 1047 | { |
| 1048 | dbg_printf("Validate load field s64\n"); |
| 1049 | break; |
| 1050 | } |
| 1051 | case FILTER_OP_LOAD_FIELD_U8: |
| 1052 | { |
| 1053 | dbg_printf("Validate load field u8\n"); |
| 1054 | break; |
| 1055 | } |
| 1056 | case FILTER_OP_LOAD_FIELD_U16: |
| 1057 | { |
| 1058 | dbg_printf("Validate load field u16\n"); |
| 1059 | break; |
| 1060 | } |
| 1061 | case FILTER_OP_LOAD_FIELD_U32: |
| 1062 | { |
| 1063 | dbg_printf("Validate load field u32\n"); |
| 1064 | break; |
| 1065 | } |
| 1066 | case FILTER_OP_LOAD_FIELD_U64: |
| 1067 | { |
| 1068 | dbg_printf("Validate load field u64\n"); |
| 1069 | break; |
| 1070 | } |
| 1071 | case FILTER_OP_LOAD_FIELD_STRING: |
| 1072 | { |
| 1073 | dbg_printf("Validate load field string\n"); |
| 1074 | break; |
| 1075 | } |
| 1076 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 1077 | { |
| 1078 | dbg_printf("Validate load field sequence\n"); |
| 1079 | break; |
| 1080 | } |
| 1081 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 1082 | { |
| 1083 | dbg_printf("Validate load field double\n"); |
| 1084 | break; |
| 1085 | } |
| 1086 | |
| 1087 | case FILTER_OP_GET_SYMBOL: |
| 1088 | { |
| 1089 | struct load_op *insn = (struct load_op *) pc; |
| 1090 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 1091 | |
| 1092 | dbg_printf("Validate get symbol offset %u\n", sym->offset); |
| 1093 | break; |
| 1094 | } |
| 1095 | |
| 1096 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 1097 | { |
| 1098 | struct load_op *insn = (struct load_op *) pc; |
| 1099 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 1100 | |
| 1101 | dbg_printf("Validate get symbol field offset %u\n", sym->offset); |
| 1102 | break; |
| 1103 | } |
| 1104 | |
| 1105 | case FILTER_OP_GET_INDEX_U16: |
| 1106 | { |
| 1107 | struct load_op *insn = (struct load_op *) pc; |
| 1108 | struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data; |
| 1109 | |
| 1110 | dbg_printf("Validate get index u16 index %u\n", get_index->index); |
| 1111 | break; |
| 1112 | } |
| 1113 | |
| 1114 | case FILTER_OP_GET_INDEX_U64: |
| 1115 | { |
| 1116 | struct load_op *insn = (struct load_op *) pc; |
| 1117 | struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data; |
| 1118 | |
| 1119 | dbg_printf("Validate get index u64 index %" PRIu64 "\n", get_index->index); |
| 1120 | break; |
| 1121 | } |
| 1122 | } |
| 1123 | end: |
| 1124 | return ret; |
| 1125 | } |
| 1126 | |
| 1127 | /* |
| 1128 | * Return value: |
| 1129 | * 0: success |
| 1130 | * <0: error |
| 1131 | */ |
| 1132 | static |
| 1133 | int validate_instruction_all_contexts(struct bytecode_runtime *bytecode, |
| 1134 | struct cds_lfht *merge_points, |
| 1135 | struct vstack *stack, |
| 1136 | char *start_pc, |
| 1137 | char *pc) |
| 1138 | { |
| 1139 | int ret; |
| 1140 | unsigned long target_pc = pc - start_pc; |
| 1141 | struct cds_lfht_iter iter; |
| 1142 | struct cds_lfht_node *node; |
| 1143 | struct lfht_mp_node *mp_node; |
| 1144 | unsigned long hash; |
| 1145 | |
| 1146 | /* Validate the context resulting from the previous instruction */ |
| 1147 | ret = validate_instruction_context(bytecode, stack, start_pc, pc); |
| 1148 | if (ret < 0) |
| 1149 | return ret; |
| 1150 | |
| 1151 | /* Validate merge points */ |
| 1152 | hash = lttng_hash_mix((const char *) target_pc, sizeof(target_pc), |
| 1153 | lttng_hash_seed); |
| 1154 | cds_lfht_lookup(merge_points, hash, lttng_hash_match, |
| 1155 | (const char *) target_pc, &iter); |
| 1156 | node = cds_lfht_iter_get_node(&iter); |
| 1157 | if (node) { |
| 1158 | mp_node = caa_container_of(node, struct lfht_mp_node, node); |
| 1159 | |
| 1160 | dbg_printf("Filter: validate merge point at offset %lu\n", |
| 1161 | target_pc); |
| 1162 | if (merge_points_compare(stack, &mp_node->stack)) { |
| 1163 | ERR("Merge points differ for offset %lu\n", |
| 1164 | target_pc); |
| 1165 | return -EINVAL; |
| 1166 | } |
| 1167 | /* Once validated, we can remove the merge point */ |
| 1168 | dbg_printf("Filter: remove merge point at offset %lu\n", |
| 1169 | target_pc); |
| 1170 | ret = cds_lfht_del(merge_points, node); |
| 1171 | assert(!ret); |
| 1172 | } |
| 1173 | return 0; |
| 1174 | } |
| 1175 | |
| 1176 | /* |
| 1177 | * Return value: |
| 1178 | * >0: going to next insn. |
| 1179 | * 0: success, stop iteration. |
| 1180 | * <0: error |
| 1181 | */ |
| 1182 | static |
| 1183 | int exec_insn(struct bytecode_runtime *bytecode, |
| 1184 | struct cds_lfht *merge_points, |
| 1185 | struct vstack *stack, |
| 1186 | char **_next_pc, |
| 1187 | char *pc) |
| 1188 | { |
| 1189 | int ret = 1; |
| 1190 | char *next_pc = *_next_pc; |
| 1191 | |
| 1192 | switch (*(filter_opcode_t *) pc) { |
| 1193 | case FILTER_OP_UNKNOWN: |
| 1194 | default: |
| 1195 | { |
| 1196 | ERR("unknown bytecode op %u\n", |
| 1197 | (unsigned int) *(filter_opcode_t *) pc); |
| 1198 | ret = -EINVAL; |
| 1199 | goto end; |
| 1200 | } |
| 1201 | |
| 1202 | case FILTER_OP_RETURN: |
| 1203 | { |
| 1204 | if (!vstack_ax(stack)) { |
| 1205 | ERR("Empty stack\n"); |
| 1206 | ret = -EINVAL; |
| 1207 | goto end; |
| 1208 | } |
| 1209 | switch (vstack_ax(stack)->type) { |
| 1210 | case REG_S64: |
| 1211 | case REG_UNKNOWN: |
| 1212 | break; |
| 1213 | default: |
| 1214 | ERR("Unexpected register type %d at end of bytecode\n", |
| 1215 | (int) vstack_ax(stack)->type); |
| 1216 | ret = -EINVAL; |
| 1217 | goto end; |
| 1218 | } |
| 1219 | |
| 1220 | ret = 0; |
| 1221 | goto end; |
| 1222 | } |
| 1223 | |
| 1224 | /* binary */ |
| 1225 | case FILTER_OP_MUL: |
| 1226 | case FILTER_OP_DIV: |
| 1227 | case FILTER_OP_MOD: |
| 1228 | case FILTER_OP_PLUS: |
| 1229 | case FILTER_OP_MINUS: |
| 1230 | case FILTER_OP_RSHIFT: |
| 1231 | case FILTER_OP_LSHIFT: |
| 1232 | { |
| 1233 | ERR("unsupported bytecode op %u\n", |
| 1234 | (unsigned int) *(filter_opcode_t *) pc); |
| 1235 | ret = -EINVAL; |
| 1236 | goto end; |
| 1237 | } |
| 1238 | |
| 1239 | case FILTER_OP_EQ: |
| 1240 | case FILTER_OP_NE: |
| 1241 | case FILTER_OP_GT: |
| 1242 | case FILTER_OP_LT: |
| 1243 | case FILTER_OP_GE: |
| 1244 | case FILTER_OP_LE: |
| 1245 | case FILTER_OP_EQ_STRING: |
| 1246 | case FILTER_OP_NE_STRING: |
| 1247 | case FILTER_OP_GT_STRING: |
| 1248 | case FILTER_OP_LT_STRING: |
| 1249 | case FILTER_OP_GE_STRING: |
| 1250 | case FILTER_OP_LE_STRING: |
| 1251 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 1252 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 1253 | case FILTER_OP_EQ_S64: |
| 1254 | case FILTER_OP_NE_S64: |
| 1255 | case FILTER_OP_GT_S64: |
| 1256 | case FILTER_OP_LT_S64: |
| 1257 | case FILTER_OP_GE_S64: |
| 1258 | case FILTER_OP_LE_S64: |
| 1259 | case FILTER_OP_EQ_DOUBLE: |
| 1260 | case FILTER_OP_NE_DOUBLE: |
| 1261 | case FILTER_OP_GT_DOUBLE: |
| 1262 | case FILTER_OP_LT_DOUBLE: |
| 1263 | case FILTER_OP_GE_DOUBLE: |
| 1264 | case FILTER_OP_LE_DOUBLE: |
| 1265 | case FILTER_OP_EQ_DOUBLE_S64: |
| 1266 | case FILTER_OP_NE_DOUBLE_S64: |
| 1267 | case FILTER_OP_GT_DOUBLE_S64: |
| 1268 | case FILTER_OP_LT_DOUBLE_S64: |
| 1269 | case FILTER_OP_GE_DOUBLE_S64: |
| 1270 | case FILTER_OP_LE_DOUBLE_S64: |
| 1271 | case FILTER_OP_EQ_S64_DOUBLE: |
| 1272 | case FILTER_OP_NE_S64_DOUBLE: |
| 1273 | case FILTER_OP_GT_S64_DOUBLE: |
| 1274 | case FILTER_OP_LT_S64_DOUBLE: |
| 1275 | case FILTER_OP_GE_S64_DOUBLE: |
| 1276 | case FILTER_OP_LE_S64_DOUBLE: |
| 1277 | case FILTER_OP_BIT_AND: |
| 1278 | case FILTER_OP_BIT_OR: |
| 1279 | case FILTER_OP_BIT_XOR: |
| 1280 | { |
| 1281 | /* Pop 2, push 1 */ |
| 1282 | if (vstack_pop(stack)) { |
| 1283 | ret = -EINVAL; |
| 1284 | goto end; |
| 1285 | } |
| 1286 | if (!vstack_ax(stack)) { |
| 1287 | ERR("Empty stack\n"); |
| 1288 | ret = -EINVAL; |
| 1289 | goto end; |
| 1290 | } |
| 1291 | switch (vstack_ax(stack)->type) { |
| 1292 | case REG_S64: |
| 1293 | case REG_DOUBLE: |
| 1294 | case REG_STRING: |
| 1295 | case REG_STAR_GLOB_STRING: |
| 1296 | case REG_UNKNOWN: |
| 1297 | break; |
| 1298 | default: |
| 1299 | ERR("Unexpected register type %d for operation\n", |
| 1300 | (int) vstack_ax(stack)->type); |
| 1301 | ret = -EINVAL; |
| 1302 | goto end; |
| 1303 | } |
| 1304 | |
| 1305 | vstack_ax(stack)->type = REG_S64; |
| 1306 | next_pc += sizeof(struct binary_op); |
| 1307 | break; |
| 1308 | } |
| 1309 | |
| 1310 | /* unary */ |
| 1311 | case FILTER_OP_UNARY_PLUS: |
| 1312 | case FILTER_OP_UNARY_MINUS: |
| 1313 | { |
| 1314 | /* Pop 1, push 1 */ |
| 1315 | if (!vstack_ax(stack)) { |
| 1316 | ERR("Empty stack\n"); |
| 1317 | ret = -EINVAL; |
| 1318 | goto end; |
| 1319 | } |
| 1320 | switch (vstack_ax(stack)->type) { |
| 1321 | case REG_UNKNOWN: |
| 1322 | case REG_DOUBLE: |
| 1323 | case REG_S64: |
| 1324 | break; |
| 1325 | default: |
| 1326 | ERR("Unexpected register type %d for operation\n", |
| 1327 | (int) vstack_ax(stack)->type); |
| 1328 | ret = -EINVAL; |
| 1329 | goto end; |
| 1330 | } |
| 1331 | vstack_ax(stack)->type = REG_UNKNOWN; |
| 1332 | next_pc += sizeof(struct unary_op); |
| 1333 | break; |
| 1334 | } |
| 1335 | |
| 1336 | case FILTER_OP_UNARY_PLUS_S64: |
| 1337 | case FILTER_OP_UNARY_MINUS_S64: |
| 1338 | case FILTER_OP_UNARY_NOT_S64: |
| 1339 | { |
| 1340 | /* Pop 1, push 1 */ |
| 1341 | if (!vstack_ax(stack)) { |
| 1342 | ERR("Empty stack\n"); |
| 1343 | ret = -EINVAL; |
| 1344 | goto end; |
| 1345 | } |
| 1346 | switch (vstack_ax(stack)->type) { |
| 1347 | case REG_S64: |
| 1348 | break; |
| 1349 | default: |
| 1350 | ERR("Unexpected register type %d for operation\n", |
| 1351 | (int) vstack_ax(stack)->type); |
| 1352 | ret = -EINVAL; |
| 1353 | goto end; |
| 1354 | } |
| 1355 | |
| 1356 | vstack_ax(stack)->type = REG_S64; |
| 1357 | next_pc += sizeof(struct unary_op); |
| 1358 | break; |
| 1359 | } |
| 1360 | |
| 1361 | case FILTER_OP_UNARY_NOT: |
| 1362 | { |
| 1363 | /* Pop 1, push 1 */ |
| 1364 | if (!vstack_ax(stack)) { |
| 1365 | ERR("Empty stack\n"); |
| 1366 | ret = -EINVAL; |
| 1367 | goto end; |
| 1368 | } |
| 1369 | switch (vstack_ax(stack)->type) { |
| 1370 | case REG_UNKNOWN: |
| 1371 | case REG_DOUBLE: |
| 1372 | case REG_S64: |
| 1373 | break; |
| 1374 | default: |
| 1375 | ERR("Unexpected register type %d for operation\n", |
| 1376 | (int) vstack_ax(stack)->type); |
| 1377 | ret = -EINVAL; |
| 1378 | goto end; |
| 1379 | } |
| 1380 | |
| 1381 | vstack_ax(stack)->type = REG_S64; |
| 1382 | next_pc += sizeof(struct unary_op); |
| 1383 | break; |
| 1384 | } |
| 1385 | |
| 1386 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 1387 | { |
| 1388 | /* Pop 1, push 1 */ |
| 1389 | if (!vstack_ax(stack)) { |
| 1390 | ERR("Empty stack\n"); |
| 1391 | ret = -EINVAL; |
| 1392 | goto end; |
| 1393 | } |
| 1394 | switch (vstack_ax(stack)->type) { |
| 1395 | case REG_DOUBLE: |
| 1396 | break; |
| 1397 | default: |
| 1398 | ERR("Incorrect register type %d for operation\n", |
| 1399 | (int) vstack_ax(stack)->type); |
| 1400 | ret = -EINVAL; |
| 1401 | goto end; |
| 1402 | } |
| 1403 | |
| 1404 | vstack_ax(stack)->type = REG_S64; |
| 1405 | next_pc += sizeof(struct unary_op); |
| 1406 | break; |
| 1407 | } |
| 1408 | |
| 1409 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 1410 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 1411 | { |
| 1412 | /* Pop 1, push 1 */ |
| 1413 | if (!vstack_ax(stack)) { |
| 1414 | ERR("Empty stack\n"); |
| 1415 | ret = -EINVAL; |
| 1416 | goto end; |
| 1417 | } |
| 1418 | switch (vstack_ax(stack)->type) { |
| 1419 | case REG_DOUBLE: |
| 1420 | break; |
| 1421 | default: |
| 1422 | ERR("Incorrect register type %d for operation\n", |
| 1423 | (int) vstack_ax(stack)->type); |
| 1424 | ret = -EINVAL; |
| 1425 | goto end; |
| 1426 | } |
| 1427 | |
| 1428 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1429 | next_pc += sizeof(struct unary_op); |
| 1430 | break; |
| 1431 | } |
| 1432 | |
| 1433 | /* logical */ |
| 1434 | case FILTER_OP_AND: |
| 1435 | case FILTER_OP_OR: |
| 1436 | { |
| 1437 | struct logical_op *insn = (struct logical_op *) pc; |
| 1438 | int merge_ret; |
| 1439 | |
| 1440 | /* Add merge point to table */ |
| 1441 | merge_ret = merge_point_add_check(merge_points, |
| 1442 | insn->skip_offset, stack); |
| 1443 | if (merge_ret) { |
| 1444 | ret = merge_ret; |
| 1445 | goto end; |
| 1446 | } |
| 1447 | |
| 1448 | if (!vstack_ax(stack)) { |
| 1449 | ERR("Empty stack\n"); |
| 1450 | ret = -EINVAL; |
| 1451 | goto end; |
| 1452 | } |
| 1453 | /* There is always a cast-to-s64 operation before a or/and op. */ |
| 1454 | switch (vstack_ax(stack)->type) { |
| 1455 | case REG_S64: |
| 1456 | break; |
| 1457 | default: |
| 1458 | ERR("Incorrect register type %d for operation\n", |
| 1459 | (int) vstack_ax(stack)->type); |
| 1460 | ret = -EINVAL; |
| 1461 | goto end; |
| 1462 | } |
| 1463 | |
| 1464 | /* Continue to next instruction */ |
| 1465 | /* Pop 1 when jump not taken */ |
| 1466 | if (vstack_pop(stack)) { |
| 1467 | ret = -EINVAL; |
| 1468 | goto end; |
| 1469 | } |
| 1470 | next_pc += sizeof(struct logical_op); |
| 1471 | break; |
| 1472 | } |
| 1473 | |
| 1474 | /* load field ref */ |
| 1475 | case FILTER_OP_LOAD_FIELD_REF: |
| 1476 | { |
| 1477 | ERR("Unknown field ref type\n"); |
| 1478 | ret = -EINVAL; |
| 1479 | goto end; |
| 1480 | } |
| 1481 | /* get context ref */ |
| 1482 | case FILTER_OP_GET_CONTEXT_REF: |
| 1483 | { |
| 1484 | if (vstack_push(stack)) { |
| 1485 | ret = -EINVAL; |
| 1486 | goto end; |
| 1487 | } |
| 1488 | vstack_ax(stack)->type = REG_UNKNOWN; |
| 1489 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1490 | break; |
| 1491 | } |
| 1492 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 1493 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 1494 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 1495 | { |
| 1496 | if (vstack_push(stack)) { |
| 1497 | ret = -EINVAL; |
| 1498 | goto end; |
| 1499 | } |
| 1500 | vstack_ax(stack)->type = REG_STRING; |
| 1501 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1502 | break; |
| 1503 | } |
| 1504 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 1505 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 1506 | { |
| 1507 | if (vstack_push(stack)) { |
| 1508 | ret = -EINVAL; |
| 1509 | goto end; |
| 1510 | } |
| 1511 | vstack_ax(stack)->type = REG_S64; |
| 1512 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1513 | break; |
| 1514 | } |
| 1515 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 1516 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 1517 | { |
| 1518 | if (vstack_push(stack)) { |
| 1519 | ret = -EINVAL; |
| 1520 | goto end; |
| 1521 | } |
| 1522 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1523 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1524 | break; |
| 1525 | } |
| 1526 | |
| 1527 | /* load from immediate operand */ |
| 1528 | case FILTER_OP_LOAD_STRING: |
| 1529 | { |
| 1530 | struct load_op *insn = (struct load_op *) pc; |
| 1531 | |
| 1532 | if (vstack_push(stack)) { |
| 1533 | ret = -EINVAL; |
| 1534 | goto end; |
| 1535 | } |
| 1536 | vstack_ax(stack)->type = REG_STRING; |
| 1537 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 1538 | break; |
| 1539 | } |
| 1540 | |
| 1541 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 1542 | { |
| 1543 | struct load_op *insn = (struct load_op *) pc; |
| 1544 | |
| 1545 | if (vstack_push(stack)) { |
| 1546 | ret = -EINVAL; |
| 1547 | goto end; |
| 1548 | } |
| 1549 | vstack_ax(stack)->type = REG_STAR_GLOB_STRING; |
| 1550 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 1551 | break; |
| 1552 | } |
| 1553 | |
| 1554 | case FILTER_OP_LOAD_S64: |
| 1555 | { |
| 1556 | if (vstack_push(stack)) { |
| 1557 | ret = -EINVAL; |
| 1558 | goto end; |
| 1559 | } |
| 1560 | vstack_ax(stack)->type = REG_S64; |
| 1561 | next_pc += sizeof(struct load_op) |
| 1562 | + sizeof(struct literal_numeric); |
| 1563 | break; |
| 1564 | } |
| 1565 | |
| 1566 | case FILTER_OP_LOAD_DOUBLE: |
| 1567 | { |
| 1568 | if (vstack_push(stack)) { |
| 1569 | ret = -EINVAL; |
| 1570 | goto end; |
| 1571 | } |
| 1572 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1573 | next_pc += sizeof(struct load_op) |
| 1574 | + sizeof(struct literal_double); |
| 1575 | break; |
| 1576 | } |
| 1577 | |
| 1578 | case FILTER_OP_CAST_TO_S64: |
| 1579 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 1580 | { |
| 1581 | /* Pop 1, push 1 */ |
| 1582 | if (!vstack_ax(stack)) { |
| 1583 | ERR("Empty stack\n"); |
| 1584 | ret = -EINVAL; |
| 1585 | goto end; |
| 1586 | } |
| 1587 | switch (vstack_ax(stack)->type) { |
| 1588 | case REG_S64: |
| 1589 | case REG_DOUBLE: |
| 1590 | case REG_UNKNOWN: |
| 1591 | break; |
| 1592 | default: |
| 1593 | ERR("Incorrect register type %d for cast\n", |
| 1594 | (int) vstack_ax(stack)->type); |
| 1595 | ret = -EINVAL; |
| 1596 | goto end; |
| 1597 | } |
| 1598 | vstack_ax(stack)->type = REG_S64; |
| 1599 | next_pc += sizeof(struct cast_op); |
| 1600 | break; |
| 1601 | } |
| 1602 | case FILTER_OP_CAST_NOP: |
| 1603 | { |
| 1604 | next_pc += sizeof(struct cast_op); |
| 1605 | break; |
| 1606 | } |
| 1607 | |
| 1608 | /* |
| 1609 | * Instructions for recursive traversal through composed types. |
| 1610 | */ |
| 1611 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 1612 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 1613 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 1614 | { |
| 1615 | if (vstack_push(stack)) { |
| 1616 | ret = -EINVAL; |
| 1617 | goto end; |
| 1618 | } |
| 1619 | vstack_ax(stack)->type = REG_PTR; |
| 1620 | next_pc += sizeof(struct load_op); |
| 1621 | break; |
| 1622 | } |
| 1623 | |
| 1624 | case FILTER_OP_LOAD_FIELD: |
| 1625 | { |
| 1626 | /* Pop 1, push 1 */ |
| 1627 | if (!vstack_ax(stack)) { |
| 1628 | ERR("Empty stack\n"); |
| 1629 | ret = -EINVAL; |
| 1630 | goto end; |
| 1631 | } |
| 1632 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1633 | ERR("Expecting pointer on top of stack\n"); |
| 1634 | ret = -EINVAL; |
| 1635 | goto end; |
| 1636 | } |
| 1637 | vstack_ax(stack)->type = REG_UNKNOWN; |
| 1638 | next_pc += sizeof(struct load_op); |
| 1639 | break; |
| 1640 | } |
| 1641 | |
| 1642 | case FILTER_OP_LOAD_FIELD_S8: |
| 1643 | case FILTER_OP_LOAD_FIELD_S16: |
| 1644 | case FILTER_OP_LOAD_FIELD_S32: |
| 1645 | case FILTER_OP_LOAD_FIELD_S64: |
| 1646 | case FILTER_OP_LOAD_FIELD_U8: |
| 1647 | case FILTER_OP_LOAD_FIELD_U16: |
| 1648 | case FILTER_OP_LOAD_FIELD_U32: |
| 1649 | case FILTER_OP_LOAD_FIELD_U64: |
| 1650 | { |
| 1651 | /* Pop 1, push 1 */ |
| 1652 | if (!vstack_ax(stack)) { |
| 1653 | ERR("Empty stack\n"); |
| 1654 | ret = -EINVAL; |
| 1655 | goto end; |
| 1656 | } |
| 1657 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1658 | ERR("Expecting pointer on top of stack\n"); |
| 1659 | ret = -EINVAL; |
| 1660 | goto end; |
| 1661 | } |
| 1662 | vstack_ax(stack)->type = REG_S64; |
| 1663 | next_pc += sizeof(struct load_op); |
| 1664 | break; |
| 1665 | } |
| 1666 | |
| 1667 | case FILTER_OP_LOAD_FIELD_STRING: |
| 1668 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 1669 | { |
| 1670 | /* Pop 1, push 1 */ |
| 1671 | if (!vstack_ax(stack)) { |
| 1672 | ERR("Empty stack\n"); |
| 1673 | ret = -EINVAL; |
| 1674 | goto end; |
| 1675 | } |
| 1676 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1677 | ERR("Expecting pointer on top of stack\n"); |
| 1678 | ret = -EINVAL; |
| 1679 | goto end; |
| 1680 | } |
| 1681 | vstack_ax(stack)->type = REG_STRING; |
| 1682 | next_pc += sizeof(struct load_op); |
| 1683 | break; |
| 1684 | } |
| 1685 | |
| 1686 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 1687 | { |
| 1688 | /* Pop 1, push 1 */ |
| 1689 | if (!vstack_ax(stack)) { |
| 1690 | ERR("Empty stack\n"); |
| 1691 | ret = -EINVAL; |
| 1692 | goto end; |
| 1693 | } |
| 1694 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1695 | ERR("Expecting pointer on top of stack\n"); |
| 1696 | ret = -EINVAL; |
| 1697 | goto end; |
| 1698 | } |
| 1699 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1700 | next_pc += sizeof(struct load_op); |
| 1701 | break; |
| 1702 | } |
| 1703 | |
| 1704 | case FILTER_OP_GET_SYMBOL: |
| 1705 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 1706 | { |
| 1707 | /* Pop 1, push 1 */ |
| 1708 | if (!vstack_ax(stack)) { |
| 1709 | ERR("Empty stack\n"); |
| 1710 | ret = -EINVAL; |
| 1711 | goto end; |
| 1712 | } |
| 1713 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1714 | ERR("Expecting pointer on top of stack\n"); |
| 1715 | ret = -EINVAL; |
| 1716 | goto end; |
| 1717 | } |
| 1718 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); |
| 1719 | break; |
| 1720 | } |
| 1721 | |
| 1722 | case FILTER_OP_GET_INDEX_U16: |
| 1723 | { |
| 1724 | /* Pop 1, push 1 */ |
| 1725 | if (!vstack_ax(stack)) { |
| 1726 | ERR("Empty stack\n"); |
| 1727 | ret = -EINVAL; |
| 1728 | goto end; |
| 1729 | } |
| 1730 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1731 | ERR("Expecting pointer on top of stack\n"); |
| 1732 | ret = -EINVAL; |
| 1733 | goto end; |
| 1734 | } |
| 1735 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); |
| 1736 | break; |
| 1737 | } |
| 1738 | |
| 1739 | case FILTER_OP_GET_INDEX_U64: |
| 1740 | { |
| 1741 | /* Pop 1, push 1 */ |
| 1742 | if (!vstack_ax(stack)) { |
| 1743 | ERR("Empty stack\n"); |
| 1744 | ret = -EINVAL; |
| 1745 | goto end; |
| 1746 | } |
| 1747 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1748 | ERR("Expecting pointer on top of stack\n"); |
| 1749 | ret = -EINVAL; |
| 1750 | goto end; |
| 1751 | } |
| 1752 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); |
| 1753 | break; |
| 1754 | } |
| 1755 | |
| 1756 | } |
| 1757 | end: |
| 1758 | *_next_pc = next_pc; |
| 1759 | return ret; |
| 1760 | } |
| 1761 | |
| 1762 | /* |
| 1763 | * Never called concurrently (hash seed is shared). |
| 1764 | */ |
| 1765 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) |
| 1766 | { |
| 1767 | struct cds_lfht *merge_points; |
| 1768 | char *pc, *next_pc, *start_pc; |
| 1769 | int ret = -EINVAL; |
| 1770 | struct vstack stack; |
| 1771 | |
| 1772 | vstack_init(&stack); |
| 1773 | |
| 1774 | if (!lttng_hash_seed_ready) { |
| 1775 | lttng_hash_seed = time(NULL); |
| 1776 | lttng_hash_seed_ready = 1; |
| 1777 | } |
| 1778 | /* |
| 1779 | * Note: merge_points hash table used by single thread, and |
| 1780 | * never concurrently resized. Therefore, we can use it without |
| 1781 | * holding RCU read-side lock and free nodes without using |
| 1782 | * call_rcu. |
| 1783 | */ |
| 1784 | merge_points = cds_lfht_new(DEFAULT_NR_MERGE_POINTS, |
| 1785 | MIN_NR_BUCKETS, MAX_NR_BUCKETS, |
| 1786 | 0, NULL); |
| 1787 | if (!merge_points) { |
| 1788 | ERR("Error allocating hash table for bytecode validation\n"); |
| 1789 | return -ENOMEM; |
| 1790 | } |
| 1791 | start_pc = &bytecode->code[0]; |
| 1792 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
| 1793 | pc = next_pc) { |
| 1794 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); |
| 1795 | if (ret != 0) { |
| 1796 | if (ret == -ERANGE) |
| 1797 | ERR("filter bytecode overflow\n"); |
| 1798 | goto end; |
| 1799 | } |
| 1800 | dbg_printf("Validating op %s (%u)\n", |
| 1801 | print_op((unsigned int) *(filter_opcode_t *) pc), |
| 1802 | (unsigned int) *(filter_opcode_t *) pc); |
| 1803 | |
| 1804 | /* |
| 1805 | * For each instruction, validate the current context |
| 1806 | * (traversal of entire execution flow), and validate |
| 1807 | * all merge points targeting this instruction. |
| 1808 | */ |
| 1809 | ret = validate_instruction_all_contexts(bytecode, merge_points, |
| 1810 | &stack, start_pc, pc); |
| 1811 | if (ret) |
| 1812 | goto end; |
| 1813 | ret = exec_insn(bytecode, merge_points, &stack, &next_pc, pc); |
| 1814 | if (ret <= 0) |
| 1815 | goto end; |
| 1816 | } |
| 1817 | end: |
| 1818 | if (delete_all_nodes(merge_points)) { |
| 1819 | if (!ret) { |
| 1820 | ERR("Unexpected merge points\n"); |
| 1821 | ret = -EINVAL; |
| 1822 | } |
| 1823 | } |
| 1824 | if (cds_lfht_destroy(merge_points, NULL)) { |
| 1825 | ERR("Error destroying hash table\n"); |
| 1826 | } |
| 1827 | return ret; |
| 1828 | } |