| 1 | /* |
| 2 | * lttng-filter-validator.c |
| 3 | * |
| 4 | * LTTng modules 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 | #include <linux/types.h> |
| 28 | #include <linux/jhash.h> |
| 29 | #include <linux/slab.h> |
| 30 | |
| 31 | #include <wrapper/list.h> |
| 32 | #include <lttng-filter.h> |
| 33 | |
| 34 | #define MERGE_POINT_TABLE_BITS 7 |
| 35 | #define MERGE_POINT_TABLE_SIZE (1U << MERGE_POINT_TABLE_BITS) |
| 36 | |
| 37 | /* merge point table node */ |
| 38 | struct mp_node { |
| 39 | struct hlist_node node; |
| 40 | |
| 41 | /* Context at merge point */ |
| 42 | struct vstack stack; |
| 43 | unsigned long target_pc; |
| 44 | }; |
| 45 | |
| 46 | struct mp_table { |
| 47 | struct hlist_head mp_head[MERGE_POINT_TABLE_SIZE]; |
| 48 | }; |
| 49 | |
| 50 | static |
| 51 | int lttng_hash_match(struct mp_node *mp_node, unsigned long key_pc) |
| 52 | { |
| 53 | if (mp_node->target_pc == key_pc) |
| 54 | return 1; |
| 55 | else |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static |
| 60 | int merge_points_compare(const struct vstack *stacka, |
| 61 | const struct vstack *stackb) |
| 62 | { |
| 63 | int i, len; |
| 64 | |
| 65 | if (stacka->top != stackb->top) |
| 66 | return 1; |
| 67 | len = stacka->top + 1; |
| 68 | WARN_ON_ONCE(len < 0); |
| 69 | for (i = 0; i < len; i++) { |
| 70 | if (stacka->e[i].type != stackb->e[i].type) |
| 71 | return 1; |
| 72 | } |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static |
| 77 | int merge_point_add_check(struct mp_table *mp_table, unsigned long target_pc, |
| 78 | const struct vstack *stack) |
| 79 | { |
| 80 | struct mp_node *mp_node; |
| 81 | unsigned long hash = jhash_1word(target_pc, 0); |
| 82 | struct hlist_head *head; |
| 83 | struct mp_node *lookup_node; |
| 84 | int found = 0; |
| 85 | |
| 86 | dbg_printk("Filter: adding merge point at offset %lu, hash %lu\n", |
| 87 | target_pc, hash); |
| 88 | mp_node = kzalloc(sizeof(struct mp_node), GFP_KERNEL); |
| 89 | if (!mp_node) |
| 90 | return -ENOMEM; |
| 91 | mp_node->target_pc = target_pc; |
| 92 | memcpy(&mp_node->stack, stack, sizeof(mp_node->stack)); |
| 93 | |
| 94 | head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)]; |
| 95 | lttng_hlist_for_each_entry(lookup_node, head, node) { |
| 96 | if (lttng_hash_match(lookup_node, target_pc)) { |
| 97 | found = 1; |
| 98 | break; |
| 99 | } |
| 100 | } |
| 101 | if (found) { |
| 102 | /* Key already present */ |
| 103 | dbg_printk("Filter: compare merge points for offset %lu, hash %lu\n", |
| 104 | target_pc, hash); |
| 105 | kfree(mp_node); |
| 106 | if (merge_points_compare(stack, &lookup_node->stack)) { |
| 107 | printk(KERN_WARNING "Merge points differ for offset %lu\n", |
| 108 | target_pc); |
| 109 | return -EINVAL; |
| 110 | } |
| 111 | } else { |
| 112 | hlist_add_head(&mp_node->node, head); |
| 113 | } |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | /* |
| 118 | * Binary comparators use top of stack and top of stack -1. |
| 119 | */ |
| 120 | static |
| 121 | int bin_op_compare_check(struct vstack *stack, const filter_opcode_t opcode, |
| 122 | const char *str) |
| 123 | { |
| 124 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) |
| 125 | goto error_empty; |
| 126 | |
| 127 | switch (vstack_ax(stack)->type) { |
| 128 | default: |
| 129 | case REG_DOUBLE: |
| 130 | goto error_type; |
| 131 | |
| 132 | case REG_STRING: |
| 133 | switch (vstack_bx(stack)->type) { |
| 134 | default: |
| 135 | case REG_DOUBLE: |
| 136 | goto error_type; |
| 137 | case REG_TYPE_UNKNOWN: |
| 138 | goto unknown; |
| 139 | case REG_STRING: |
| 140 | break; |
| 141 | case REG_STAR_GLOB_STRING: |
| 142 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { |
| 143 | goto error_mismatch; |
| 144 | } |
| 145 | break; |
| 146 | case REG_S64: |
| 147 | goto error_mismatch; |
| 148 | } |
| 149 | break; |
| 150 | case REG_STAR_GLOB_STRING: |
| 151 | switch (vstack_bx(stack)->type) { |
| 152 | default: |
| 153 | case REG_DOUBLE: |
| 154 | goto error_type; |
| 155 | case REG_TYPE_UNKNOWN: |
| 156 | goto unknown; |
| 157 | case REG_STRING: |
| 158 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { |
| 159 | goto error_mismatch; |
| 160 | } |
| 161 | break; |
| 162 | case REG_STAR_GLOB_STRING: |
| 163 | case REG_S64: |
| 164 | goto error_mismatch; |
| 165 | } |
| 166 | break; |
| 167 | case REG_S64: |
| 168 | switch (vstack_bx(stack)->type) { |
| 169 | default: |
| 170 | case REG_DOUBLE: |
| 171 | goto error_type; |
| 172 | case REG_TYPE_UNKNOWN: |
| 173 | goto unknown; |
| 174 | case REG_STRING: |
| 175 | case REG_STAR_GLOB_STRING: |
| 176 | goto error_mismatch; |
| 177 | case REG_S64: |
| 178 | break; |
| 179 | } |
| 180 | break; |
| 181 | case REG_TYPE_UNKNOWN: |
| 182 | switch (vstack_bx(stack)->type) { |
| 183 | default: |
| 184 | case REG_DOUBLE: |
| 185 | goto error_type; |
| 186 | case REG_TYPE_UNKNOWN: |
| 187 | case REG_STRING: |
| 188 | case REG_STAR_GLOB_STRING: |
| 189 | case REG_S64: |
| 190 | goto unknown; |
| 191 | } |
| 192 | break; |
| 193 | } |
| 194 | return 0; |
| 195 | |
| 196 | unknown: |
| 197 | return 1; |
| 198 | |
| 199 | error_empty: |
| 200 | printk(KERN_WARNING "empty stack for '%s' binary operator\n", str); |
| 201 | return -EINVAL; |
| 202 | |
| 203 | error_mismatch: |
| 204 | printk(KERN_WARNING "type mismatch for '%s' binary operator\n", str); |
| 205 | return -EINVAL; |
| 206 | |
| 207 | error_type: |
| 208 | printk(KERN_WARNING "unknown type for '%s' binary operator\n", str); |
| 209 | return -EINVAL; |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Binary bitwise operators use top of stack and top of stack -1. |
| 214 | * Return 0 if typing is known to match, 1 if typing is dynamic |
| 215 | * (unknown), negative error value on error. |
| 216 | */ |
| 217 | static |
| 218 | int bin_op_bitwise_check(struct vstack *stack, filter_opcode_t opcode, |
| 219 | const char *str) |
| 220 | { |
| 221 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) |
| 222 | goto error_empty; |
| 223 | |
| 224 | switch (vstack_ax(stack)->type) { |
| 225 | default: |
| 226 | case REG_DOUBLE: |
| 227 | goto error_type; |
| 228 | |
| 229 | case REG_TYPE_UNKNOWN: |
| 230 | switch (vstack_bx(stack)->type) { |
| 231 | default: |
| 232 | case REG_DOUBLE: |
| 233 | goto error_type; |
| 234 | case REG_TYPE_UNKNOWN: |
| 235 | case REG_STRING: |
| 236 | case REG_STAR_GLOB_STRING: |
| 237 | case REG_S64: |
| 238 | goto unknown; |
| 239 | } |
| 240 | break; |
| 241 | case REG_S64: |
| 242 | switch (vstack_bx(stack)->type) { |
| 243 | default: |
| 244 | case REG_DOUBLE: |
| 245 | goto error_type; |
| 246 | case REG_TYPE_UNKNOWN: |
| 247 | goto unknown; |
| 248 | case REG_S64: |
| 249 | break; |
| 250 | } |
| 251 | break; |
| 252 | } |
| 253 | return 0; |
| 254 | |
| 255 | unknown: |
| 256 | return 1; |
| 257 | |
| 258 | error_empty: |
| 259 | printk(KERN_WARNING "empty stack for '%s' binary operator\n", str); |
| 260 | return -EINVAL; |
| 261 | |
| 262 | error_type: |
| 263 | printk(KERN_WARNING "unknown type for '%s' binary operator\n", str); |
| 264 | return -EINVAL; |
| 265 | } |
| 266 | |
| 267 | static |
| 268 | int validate_get_symbol(struct bytecode_runtime *bytecode, |
| 269 | const struct get_symbol *sym) |
| 270 | { |
| 271 | const char *str, *str_limit; |
| 272 | size_t len_limit; |
| 273 | |
| 274 | if (sym->offset >= bytecode->p.bc->bc.len - bytecode->p.bc->bc.reloc_offset) |
| 275 | return -EINVAL; |
| 276 | |
| 277 | str = bytecode->p.bc->bc.data + bytecode->p.bc->bc.reloc_offset + sym->offset; |
| 278 | str_limit = bytecode->p.bc->bc.data + bytecode->p.bc->bc.len; |
| 279 | len_limit = str_limit - str; |
| 280 | if (strnlen(str, len_limit) == len_limit) |
| 281 | return -EINVAL; |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | /* |
| 286 | * Validate bytecode range overflow within the validation pass. |
| 287 | * Called for each instruction encountered. |
| 288 | */ |
| 289 | static |
| 290 | int bytecode_validate_overflow(struct bytecode_runtime *bytecode, |
| 291 | char *start_pc, char *pc) |
| 292 | { |
| 293 | int ret = 0; |
| 294 | |
| 295 | switch (*(filter_opcode_t *) pc) { |
| 296 | case FILTER_OP_UNKNOWN: |
| 297 | default: |
| 298 | { |
| 299 | printk(KERN_WARNING "unknown bytecode op %u\n", |
| 300 | (unsigned int) *(filter_opcode_t *) pc); |
| 301 | ret = -EINVAL; |
| 302 | break; |
| 303 | } |
| 304 | |
| 305 | case FILTER_OP_RETURN: |
| 306 | { |
| 307 | if (unlikely(pc + sizeof(struct return_op) |
| 308 | > start_pc + bytecode->len)) { |
| 309 | ret = -ERANGE; |
| 310 | } |
| 311 | break; |
| 312 | } |
| 313 | |
| 314 | /* binary */ |
| 315 | case FILTER_OP_MUL: |
| 316 | case FILTER_OP_DIV: |
| 317 | case FILTER_OP_MOD: |
| 318 | case FILTER_OP_PLUS: |
| 319 | case FILTER_OP_MINUS: |
| 320 | case FILTER_OP_EQ_DOUBLE: |
| 321 | case FILTER_OP_NE_DOUBLE: |
| 322 | case FILTER_OP_GT_DOUBLE: |
| 323 | case FILTER_OP_LT_DOUBLE: |
| 324 | case FILTER_OP_GE_DOUBLE: |
| 325 | case FILTER_OP_LE_DOUBLE: |
| 326 | /* Floating point */ |
| 327 | case FILTER_OP_EQ_DOUBLE_S64: |
| 328 | case FILTER_OP_NE_DOUBLE_S64: |
| 329 | case FILTER_OP_GT_DOUBLE_S64: |
| 330 | case FILTER_OP_LT_DOUBLE_S64: |
| 331 | case FILTER_OP_GE_DOUBLE_S64: |
| 332 | case FILTER_OP_LE_DOUBLE_S64: |
| 333 | case FILTER_OP_EQ_S64_DOUBLE: |
| 334 | case FILTER_OP_NE_S64_DOUBLE: |
| 335 | case FILTER_OP_GT_S64_DOUBLE: |
| 336 | case FILTER_OP_LT_S64_DOUBLE: |
| 337 | case FILTER_OP_GE_S64_DOUBLE: |
| 338 | case FILTER_OP_LE_S64_DOUBLE: |
| 339 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 340 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 341 | case FILTER_OP_LOAD_DOUBLE: |
| 342 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 343 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 344 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 345 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 346 | { |
| 347 | printk(KERN_WARNING "unsupported bytecode op %u\n", |
| 348 | (unsigned int) *(filter_opcode_t *) pc); |
| 349 | ret = -EINVAL; |
| 350 | break; |
| 351 | } |
| 352 | |
| 353 | case FILTER_OP_EQ: |
| 354 | case FILTER_OP_NE: |
| 355 | case FILTER_OP_GT: |
| 356 | case FILTER_OP_LT: |
| 357 | case FILTER_OP_GE: |
| 358 | case FILTER_OP_LE: |
| 359 | case FILTER_OP_EQ_STRING: |
| 360 | case FILTER_OP_NE_STRING: |
| 361 | case FILTER_OP_GT_STRING: |
| 362 | case FILTER_OP_LT_STRING: |
| 363 | case FILTER_OP_GE_STRING: |
| 364 | case FILTER_OP_LE_STRING: |
| 365 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 366 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 367 | case FILTER_OP_EQ_S64: |
| 368 | case FILTER_OP_NE_S64: |
| 369 | case FILTER_OP_GT_S64: |
| 370 | case FILTER_OP_LT_S64: |
| 371 | case FILTER_OP_GE_S64: |
| 372 | case FILTER_OP_LE_S64: |
| 373 | case FILTER_OP_BIT_RSHIFT: |
| 374 | case FILTER_OP_BIT_LSHIFT: |
| 375 | case FILTER_OP_BIT_AND: |
| 376 | case FILTER_OP_BIT_OR: |
| 377 | case FILTER_OP_BIT_XOR: |
| 378 | { |
| 379 | if (unlikely(pc + sizeof(struct binary_op) |
| 380 | > start_pc + bytecode->len)) { |
| 381 | ret = -ERANGE; |
| 382 | } |
| 383 | break; |
| 384 | } |
| 385 | |
| 386 | /* unary */ |
| 387 | case FILTER_OP_UNARY_PLUS: |
| 388 | case FILTER_OP_UNARY_MINUS: |
| 389 | case FILTER_OP_UNARY_NOT: |
| 390 | case FILTER_OP_UNARY_PLUS_S64: |
| 391 | case FILTER_OP_UNARY_MINUS_S64: |
| 392 | case FILTER_OP_UNARY_NOT_S64: |
| 393 | case FILTER_OP_UNARY_BIT_NOT: |
| 394 | { |
| 395 | if (unlikely(pc + sizeof(struct unary_op) |
| 396 | > start_pc + bytecode->len)) { |
| 397 | ret = -ERANGE; |
| 398 | } |
| 399 | break; |
| 400 | } |
| 401 | |
| 402 | /* logical */ |
| 403 | case FILTER_OP_AND: |
| 404 | case FILTER_OP_OR: |
| 405 | { |
| 406 | if (unlikely(pc + sizeof(struct logical_op) |
| 407 | > start_pc + bytecode->len)) { |
| 408 | ret = -ERANGE; |
| 409 | } |
| 410 | break; |
| 411 | } |
| 412 | |
| 413 | /* load field ref */ |
| 414 | case FILTER_OP_LOAD_FIELD_REF: |
| 415 | { |
| 416 | printk(KERN_WARNING "Unknown field ref type\n"); |
| 417 | ret = -EINVAL; |
| 418 | break; |
| 419 | } |
| 420 | |
| 421 | /* get context ref */ |
| 422 | case FILTER_OP_GET_CONTEXT_REF: |
| 423 | { |
| 424 | printk(KERN_WARNING "Unknown field ref type\n"); |
| 425 | ret = -EINVAL; |
| 426 | break; |
| 427 | } |
| 428 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 429 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 430 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
| 431 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: |
| 432 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 433 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 434 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 435 | { |
| 436 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) |
| 437 | > start_pc + bytecode->len)) { |
| 438 | ret = -ERANGE; |
| 439 | } |
| 440 | break; |
| 441 | } |
| 442 | |
| 443 | /* load from immediate operand */ |
| 444 | case FILTER_OP_LOAD_STRING: |
| 445 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 446 | { |
| 447 | struct load_op *insn = (struct load_op *) pc; |
| 448 | uint32_t str_len, maxlen; |
| 449 | |
| 450 | if (unlikely(pc + sizeof(struct load_op) |
| 451 | > start_pc + bytecode->len)) { |
| 452 | ret = -ERANGE; |
| 453 | break; |
| 454 | } |
| 455 | |
| 456 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); |
| 457 | str_len = strnlen(insn->data, maxlen); |
| 458 | if (unlikely(str_len >= maxlen)) { |
| 459 | /* Final '\0' not found within range */ |
| 460 | ret = -ERANGE; |
| 461 | } |
| 462 | break; |
| 463 | } |
| 464 | |
| 465 | case FILTER_OP_LOAD_S64: |
| 466 | { |
| 467 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) |
| 468 | > start_pc + bytecode->len)) { |
| 469 | ret = -ERANGE; |
| 470 | } |
| 471 | break; |
| 472 | } |
| 473 | |
| 474 | case FILTER_OP_CAST_TO_S64: |
| 475 | case FILTER_OP_CAST_NOP: |
| 476 | { |
| 477 | if (unlikely(pc + sizeof(struct cast_op) |
| 478 | > start_pc + bytecode->len)) { |
| 479 | ret = -ERANGE; |
| 480 | } |
| 481 | break; |
| 482 | } |
| 483 | |
| 484 | /* |
| 485 | * Instructions for recursive traversal through composed types. |
| 486 | */ |
| 487 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 488 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 489 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 490 | case FILTER_OP_LOAD_FIELD: |
| 491 | case FILTER_OP_LOAD_FIELD_S8: |
| 492 | case FILTER_OP_LOAD_FIELD_S16: |
| 493 | case FILTER_OP_LOAD_FIELD_S32: |
| 494 | case FILTER_OP_LOAD_FIELD_S64: |
| 495 | case FILTER_OP_LOAD_FIELD_U8: |
| 496 | case FILTER_OP_LOAD_FIELD_U16: |
| 497 | case FILTER_OP_LOAD_FIELD_U32: |
| 498 | case FILTER_OP_LOAD_FIELD_U64: |
| 499 | case FILTER_OP_LOAD_FIELD_STRING: |
| 500 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 501 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 502 | if (unlikely(pc + sizeof(struct load_op) |
| 503 | > start_pc + bytecode->len)) { |
| 504 | ret = -ERANGE; |
| 505 | } |
| 506 | break; |
| 507 | |
| 508 | case FILTER_OP_GET_SYMBOL: |
| 509 | { |
| 510 | struct load_op *insn = (struct load_op *) pc; |
| 511 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 512 | |
| 513 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol) |
| 514 | > start_pc + bytecode->len)) { |
| 515 | ret = -ERANGE; |
| 516 | } |
| 517 | ret = validate_get_symbol(bytecode, sym); |
| 518 | break; |
| 519 | } |
| 520 | |
| 521 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 522 | printk(KERN_WARNING "Unexpected get symbol field\n"); |
| 523 | ret = -EINVAL; |
| 524 | break; |
| 525 | |
| 526 | case FILTER_OP_GET_INDEX_U16: |
| 527 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16) |
| 528 | > start_pc + bytecode->len)) { |
| 529 | ret = -ERANGE; |
| 530 | } |
| 531 | break; |
| 532 | |
| 533 | case FILTER_OP_GET_INDEX_U64: |
| 534 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64) |
| 535 | > start_pc + bytecode->len)) { |
| 536 | ret = -ERANGE; |
| 537 | } |
| 538 | break; |
| 539 | } |
| 540 | |
| 541 | return ret; |
| 542 | } |
| 543 | |
| 544 | static |
| 545 | unsigned long delete_all_nodes(struct mp_table *mp_table) |
| 546 | { |
| 547 | struct mp_node *mp_node; |
| 548 | struct hlist_node *tmp; |
| 549 | unsigned long nr_nodes = 0; |
| 550 | int i; |
| 551 | |
| 552 | for (i = 0; i < MERGE_POINT_TABLE_SIZE; i++) { |
| 553 | struct hlist_head *head; |
| 554 | |
| 555 | head = &mp_table->mp_head[i]; |
| 556 | lttng_hlist_for_each_entry_safe(mp_node, tmp, head, node) { |
| 557 | kfree(mp_node); |
| 558 | nr_nodes++; |
| 559 | } |
| 560 | } |
| 561 | return nr_nodes; |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * Return value: |
| 566 | * >=0: success |
| 567 | * <0: error |
| 568 | */ |
| 569 | static |
| 570 | int validate_instruction_context(struct bytecode_runtime *bytecode, |
| 571 | struct vstack *stack, |
| 572 | char *start_pc, |
| 573 | char *pc) |
| 574 | { |
| 575 | int ret = 0; |
| 576 | const filter_opcode_t opcode = *(filter_opcode_t *) pc; |
| 577 | |
| 578 | switch (opcode) { |
| 579 | case FILTER_OP_UNKNOWN: |
| 580 | default: |
| 581 | { |
| 582 | printk(KERN_WARNING "unknown bytecode op %u\n", |
| 583 | (unsigned int) *(filter_opcode_t *) pc); |
| 584 | ret = -EINVAL; |
| 585 | goto end; |
| 586 | } |
| 587 | |
| 588 | case FILTER_OP_RETURN: |
| 589 | { |
| 590 | goto end; |
| 591 | } |
| 592 | |
| 593 | /* binary */ |
| 594 | case FILTER_OP_MUL: |
| 595 | case FILTER_OP_DIV: |
| 596 | case FILTER_OP_MOD: |
| 597 | case FILTER_OP_PLUS: |
| 598 | case FILTER_OP_MINUS: |
| 599 | /* Floating point */ |
| 600 | case FILTER_OP_EQ_DOUBLE: |
| 601 | case FILTER_OP_NE_DOUBLE: |
| 602 | case FILTER_OP_GT_DOUBLE: |
| 603 | case FILTER_OP_LT_DOUBLE: |
| 604 | case FILTER_OP_GE_DOUBLE: |
| 605 | case FILTER_OP_LE_DOUBLE: |
| 606 | case FILTER_OP_EQ_DOUBLE_S64: |
| 607 | case FILTER_OP_NE_DOUBLE_S64: |
| 608 | case FILTER_OP_GT_DOUBLE_S64: |
| 609 | case FILTER_OP_LT_DOUBLE_S64: |
| 610 | case FILTER_OP_GE_DOUBLE_S64: |
| 611 | case FILTER_OP_LE_DOUBLE_S64: |
| 612 | case FILTER_OP_EQ_S64_DOUBLE: |
| 613 | case FILTER_OP_NE_S64_DOUBLE: |
| 614 | case FILTER_OP_GT_S64_DOUBLE: |
| 615 | case FILTER_OP_LT_S64_DOUBLE: |
| 616 | case FILTER_OP_GE_S64_DOUBLE: |
| 617 | case FILTER_OP_LE_S64_DOUBLE: |
| 618 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 619 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 620 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 621 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 622 | case FILTER_OP_LOAD_DOUBLE: |
| 623 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 624 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 625 | { |
| 626 | printk(KERN_WARNING "unsupported bytecode op %u\n", |
| 627 | (unsigned int) *(filter_opcode_t *) pc); |
| 628 | ret = -EINVAL; |
| 629 | goto end; |
| 630 | } |
| 631 | |
| 632 | case FILTER_OP_EQ: |
| 633 | { |
| 634 | ret = bin_op_compare_check(stack, opcode, "=="); |
| 635 | if (ret < 0) |
| 636 | goto end; |
| 637 | break; |
| 638 | } |
| 639 | case FILTER_OP_NE: |
| 640 | { |
| 641 | ret = bin_op_compare_check(stack, opcode, "!="); |
| 642 | if (ret < 0) |
| 643 | goto end; |
| 644 | break; |
| 645 | } |
| 646 | case FILTER_OP_GT: |
| 647 | { |
| 648 | ret = bin_op_compare_check(stack, opcode, ">"); |
| 649 | if (ret < 0) |
| 650 | goto end; |
| 651 | break; |
| 652 | } |
| 653 | case FILTER_OP_LT: |
| 654 | { |
| 655 | ret = bin_op_compare_check(stack, opcode, "<"); |
| 656 | if (ret < 0) |
| 657 | goto end; |
| 658 | break; |
| 659 | } |
| 660 | case FILTER_OP_GE: |
| 661 | { |
| 662 | ret = bin_op_compare_check(stack, opcode, ">="); |
| 663 | if (ret < 0) |
| 664 | goto end; |
| 665 | break; |
| 666 | } |
| 667 | case FILTER_OP_LE: |
| 668 | { |
| 669 | ret = bin_op_compare_check(stack, opcode, "<="); |
| 670 | if (ret < 0) |
| 671 | goto end; |
| 672 | break; |
| 673 | } |
| 674 | |
| 675 | case FILTER_OP_EQ_STRING: |
| 676 | case FILTER_OP_NE_STRING: |
| 677 | case FILTER_OP_GT_STRING: |
| 678 | case FILTER_OP_LT_STRING: |
| 679 | case FILTER_OP_GE_STRING: |
| 680 | case FILTER_OP_LE_STRING: |
| 681 | { |
| 682 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 683 | printk(KERN_WARNING "Empty stack\n"); |
| 684 | ret = -EINVAL; |
| 685 | goto end; |
| 686 | } |
| 687 | if (vstack_ax(stack)->type != REG_STRING |
| 688 | || vstack_bx(stack)->type != REG_STRING) { |
| 689 | printk(KERN_WARNING "Unexpected register type for string comparator\n"); |
| 690 | ret = -EINVAL; |
| 691 | goto end; |
| 692 | } |
| 693 | break; |
| 694 | } |
| 695 | |
| 696 | |
| 697 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 698 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 699 | { |
| 700 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 701 | printk(KERN_WARNING "Empty stack\n"); |
| 702 | ret = -EINVAL; |
| 703 | goto end; |
| 704 | } |
| 705 | if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING |
| 706 | && vstack_bx(stack)->type != REG_STAR_GLOB_STRING) { |
| 707 | printk(KERN_WARNING "Unexpected register type for globbing pattern comparator\n"); |
| 708 | ret = -EINVAL; |
| 709 | goto end; |
| 710 | } |
| 711 | break; |
| 712 | } |
| 713 | |
| 714 | case FILTER_OP_EQ_S64: |
| 715 | case FILTER_OP_NE_S64: |
| 716 | case FILTER_OP_GT_S64: |
| 717 | case FILTER_OP_LT_S64: |
| 718 | case FILTER_OP_GE_S64: |
| 719 | case FILTER_OP_LE_S64: |
| 720 | { |
| 721 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
| 722 | printk(KERN_WARNING "Empty stack\n"); |
| 723 | ret = -EINVAL; |
| 724 | goto end; |
| 725 | } |
| 726 | if (vstack_ax(stack)->type != REG_S64 |
| 727 | || vstack_bx(stack)->type != REG_S64) { |
| 728 | printk(KERN_WARNING "Unexpected register type for s64 comparator\n"); |
| 729 | ret = -EINVAL; |
| 730 | goto end; |
| 731 | } |
| 732 | break; |
| 733 | } |
| 734 | |
| 735 | case FILTER_OP_BIT_RSHIFT: |
| 736 | ret = bin_op_bitwise_check(stack, opcode, ">>"); |
| 737 | if (ret < 0) |
| 738 | goto end; |
| 739 | break; |
| 740 | case FILTER_OP_BIT_LSHIFT: |
| 741 | ret = bin_op_bitwise_check(stack, opcode, "<<"); |
| 742 | if (ret < 0) |
| 743 | goto end; |
| 744 | break; |
| 745 | case FILTER_OP_BIT_AND: |
| 746 | ret = bin_op_bitwise_check(stack, opcode, "&"); |
| 747 | if (ret < 0) |
| 748 | goto end; |
| 749 | break; |
| 750 | case FILTER_OP_BIT_OR: |
| 751 | ret = bin_op_bitwise_check(stack, opcode, "|"); |
| 752 | if (ret < 0) |
| 753 | goto end; |
| 754 | break; |
| 755 | case FILTER_OP_BIT_XOR: |
| 756 | ret = bin_op_bitwise_check(stack, opcode, "^"); |
| 757 | if (ret < 0) |
| 758 | goto end; |
| 759 | break; |
| 760 | |
| 761 | /* unary */ |
| 762 | case FILTER_OP_UNARY_PLUS: |
| 763 | case FILTER_OP_UNARY_MINUS: |
| 764 | case FILTER_OP_UNARY_NOT: |
| 765 | { |
| 766 | if (!vstack_ax(stack)) { |
| 767 | printk(KERN_WARNING "Empty stack\n"); |
| 768 | ret = -EINVAL; |
| 769 | goto end; |
| 770 | } |
| 771 | switch (vstack_ax(stack)->type) { |
| 772 | default: |
| 773 | case REG_DOUBLE: |
| 774 | printk(KERN_WARNING "unknown register type\n"); |
| 775 | ret = -EINVAL; |
| 776 | goto end; |
| 777 | |
| 778 | case REG_STRING: |
| 779 | case REG_STAR_GLOB_STRING: |
| 780 | printk(KERN_WARNING "Unary op can only be applied to numeric or floating point registers\n"); |
| 781 | ret = -EINVAL; |
| 782 | goto end; |
| 783 | case REG_S64: |
| 784 | case REG_TYPE_UNKNOWN: |
| 785 | break; |
| 786 | } |
| 787 | break; |
| 788 | } |
| 789 | case FILTER_OP_UNARY_BIT_NOT: |
| 790 | { |
| 791 | if (!vstack_ax(stack)) { |
| 792 | printk(KERN_WARNING "Empty stack\n"); |
| 793 | ret = -EINVAL; |
| 794 | goto end; |
| 795 | } |
| 796 | switch (vstack_ax(stack)->type) { |
| 797 | default: |
| 798 | printk(KERN_WARNING "unknown register type\n"); |
| 799 | ret = -EINVAL; |
| 800 | goto end; |
| 801 | |
| 802 | case REG_STRING: |
| 803 | case REG_STAR_GLOB_STRING: |
| 804 | case REG_DOUBLE: |
| 805 | printk(KERN_WARNING "Unary bitwise op can only be applied to numeric registers\n"); |
| 806 | ret = -EINVAL; |
| 807 | goto end; |
| 808 | case REG_S64: |
| 809 | break; |
| 810 | case REG_TYPE_UNKNOWN: |
| 811 | break; |
| 812 | } |
| 813 | break; |
| 814 | } |
| 815 | |
| 816 | case FILTER_OP_UNARY_PLUS_S64: |
| 817 | case FILTER_OP_UNARY_MINUS_S64: |
| 818 | case FILTER_OP_UNARY_NOT_S64: |
| 819 | { |
| 820 | if (!vstack_ax(stack)) { |
| 821 | printk(KERN_WARNING "Empty stack\n"); |
| 822 | ret = -EINVAL; |
| 823 | goto end; |
| 824 | } |
| 825 | if (vstack_ax(stack)->type != REG_S64) { |
| 826 | printk(KERN_WARNING "Invalid register type\n"); |
| 827 | ret = -EINVAL; |
| 828 | goto end; |
| 829 | } |
| 830 | break; |
| 831 | } |
| 832 | |
| 833 | /* logical */ |
| 834 | case FILTER_OP_AND: |
| 835 | case FILTER_OP_OR: |
| 836 | { |
| 837 | struct logical_op *insn = (struct logical_op *) pc; |
| 838 | |
| 839 | if (!vstack_ax(stack)) { |
| 840 | printk(KERN_WARNING "Empty stack\n"); |
| 841 | ret = -EINVAL; |
| 842 | goto end; |
| 843 | } |
| 844 | if (vstack_ax(stack)->type != REG_S64) { |
| 845 | printk(KERN_WARNING "Logical comparator expects S64 register\n"); |
| 846 | ret = -EINVAL; |
| 847 | goto end; |
| 848 | } |
| 849 | |
| 850 | dbg_printk("Validate jumping to bytecode offset %u\n", |
| 851 | (unsigned int) insn->skip_offset); |
| 852 | if (unlikely(start_pc + insn->skip_offset <= pc)) { |
| 853 | printk(KERN_WARNING "Loops are not allowed in bytecode\n"); |
| 854 | ret = -EINVAL; |
| 855 | goto end; |
| 856 | } |
| 857 | break; |
| 858 | } |
| 859 | |
| 860 | /* load field ref */ |
| 861 | case FILTER_OP_LOAD_FIELD_REF: |
| 862 | { |
| 863 | printk(KERN_WARNING "Unknown field ref type\n"); |
| 864 | ret = -EINVAL; |
| 865 | goto end; |
| 866 | } |
| 867 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 868 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 869 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
| 870 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: |
| 871 | { |
| 872 | struct load_op *insn = (struct load_op *) pc; |
| 873 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 874 | |
| 875 | dbg_printk("Validate load field ref offset %u type string\n", |
| 876 | ref->offset); |
| 877 | break; |
| 878 | } |
| 879 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 880 | { |
| 881 | struct load_op *insn = (struct load_op *) pc; |
| 882 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 883 | |
| 884 | dbg_printk("Validate load field ref offset %u type s64\n", |
| 885 | ref->offset); |
| 886 | break; |
| 887 | } |
| 888 | |
| 889 | /* load from immediate operand */ |
| 890 | case FILTER_OP_LOAD_STRING: |
| 891 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 892 | { |
| 893 | break; |
| 894 | } |
| 895 | |
| 896 | case FILTER_OP_LOAD_S64: |
| 897 | { |
| 898 | break; |
| 899 | } |
| 900 | |
| 901 | case FILTER_OP_CAST_TO_S64: |
| 902 | { |
| 903 | struct cast_op *insn = (struct cast_op *) pc; |
| 904 | |
| 905 | if (!vstack_ax(stack)) { |
| 906 | printk(KERN_WARNING "Empty stack\n"); |
| 907 | ret = -EINVAL; |
| 908 | goto end; |
| 909 | } |
| 910 | switch (vstack_ax(stack)->type) { |
| 911 | default: |
| 912 | case REG_DOUBLE: |
| 913 | printk(KERN_WARNING "unknown register type\n"); |
| 914 | ret = -EINVAL; |
| 915 | goto end; |
| 916 | |
| 917 | case REG_STRING: |
| 918 | case REG_STAR_GLOB_STRING: |
| 919 | printk(KERN_WARNING "Cast op can only be applied to numeric or floating point registers\n"); |
| 920 | ret = -EINVAL; |
| 921 | goto end; |
| 922 | case REG_S64: |
| 923 | break; |
| 924 | } |
| 925 | if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) { |
| 926 | if (vstack_ax(stack)->type != REG_DOUBLE) { |
| 927 | printk(KERN_WARNING "Cast expects double\n"); |
| 928 | ret = -EINVAL; |
| 929 | goto end; |
| 930 | } |
| 931 | } |
| 932 | break; |
| 933 | } |
| 934 | case FILTER_OP_CAST_NOP: |
| 935 | { |
| 936 | break; |
| 937 | } |
| 938 | |
| 939 | /* get context ref */ |
| 940 | case FILTER_OP_GET_CONTEXT_REF: |
| 941 | { |
| 942 | printk(KERN_WARNING "Unknown get context ref type\n"); |
| 943 | ret = -EINVAL; |
| 944 | goto end; |
| 945 | } |
| 946 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 947 | { |
| 948 | struct load_op *insn = (struct load_op *) pc; |
| 949 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 950 | |
| 951 | dbg_printk("Validate get context ref offset %u type string\n", |
| 952 | ref->offset); |
| 953 | break; |
| 954 | } |
| 955 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 956 | { |
| 957 | struct load_op *insn = (struct load_op *) pc; |
| 958 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 959 | |
| 960 | dbg_printk("Validate get context ref offset %u type s64\n", |
| 961 | ref->offset); |
| 962 | break; |
| 963 | } |
| 964 | |
| 965 | /* |
| 966 | * Instructions for recursive traversal through composed types. |
| 967 | */ |
| 968 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 969 | { |
| 970 | dbg_printk("Validate get context root\n"); |
| 971 | break; |
| 972 | } |
| 973 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 974 | { |
| 975 | dbg_printk("Validate get app context root\n"); |
| 976 | break; |
| 977 | } |
| 978 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 979 | { |
| 980 | dbg_printk("Validate get payload root\n"); |
| 981 | break; |
| 982 | } |
| 983 | case FILTER_OP_LOAD_FIELD: |
| 984 | { |
| 985 | /* |
| 986 | * We tolerate that field type is unknown at validation, |
| 987 | * because we are performing the load specialization in |
| 988 | * a phase after validation. |
| 989 | */ |
| 990 | dbg_printk("Validate load field\n"); |
| 991 | break; |
| 992 | } |
| 993 | case FILTER_OP_LOAD_FIELD_S8: |
| 994 | { |
| 995 | dbg_printk("Validate load field s8\n"); |
| 996 | break; |
| 997 | } |
| 998 | case FILTER_OP_LOAD_FIELD_S16: |
| 999 | { |
| 1000 | dbg_printk("Validate load field s16\n"); |
| 1001 | break; |
| 1002 | } |
| 1003 | case FILTER_OP_LOAD_FIELD_S32: |
| 1004 | { |
| 1005 | dbg_printk("Validate load field s32\n"); |
| 1006 | break; |
| 1007 | } |
| 1008 | case FILTER_OP_LOAD_FIELD_S64: |
| 1009 | { |
| 1010 | dbg_printk("Validate load field s64\n"); |
| 1011 | break; |
| 1012 | } |
| 1013 | case FILTER_OP_LOAD_FIELD_U8: |
| 1014 | { |
| 1015 | dbg_printk("Validate load field u8\n"); |
| 1016 | break; |
| 1017 | } |
| 1018 | case FILTER_OP_LOAD_FIELD_U16: |
| 1019 | { |
| 1020 | dbg_printk("Validate load field u16\n"); |
| 1021 | break; |
| 1022 | } |
| 1023 | case FILTER_OP_LOAD_FIELD_U32: |
| 1024 | { |
| 1025 | dbg_printk("Validate load field u32\n"); |
| 1026 | break; |
| 1027 | } |
| 1028 | case FILTER_OP_LOAD_FIELD_U64: |
| 1029 | { |
| 1030 | dbg_printk("Validate load field u64\n"); |
| 1031 | break; |
| 1032 | } |
| 1033 | case FILTER_OP_LOAD_FIELD_STRING: |
| 1034 | { |
| 1035 | dbg_printk("Validate load field string\n"); |
| 1036 | break; |
| 1037 | } |
| 1038 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 1039 | { |
| 1040 | dbg_printk("Validate load field sequence\n"); |
| 1041 | break; |
| 1042 | } |
| 1043 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 1044 | { |
| 1045 | dbg_printk("Validate load field double\n"); |
| 1046 | break; |
| 1047 | } |
| 1048 | |
| 1049 | case FILTER_OP_GET_SYMBOL: |
| 1050 | { |
| 1051 | struct load_op *insn = (struct load_op *) pc; |
| 1052 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 1053 | |
| 1054 | dbg_printk("Validate get symbol offset %u\n", sym->offset); |
| 1055 | break; |
| 1056 | } |
| 1057 | |
| 1058 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 1059 | { |
| 1060 | struct load_op *insn = (struct load_op *) pc; |
| 1061 | struct get_symbol *sym = (struct get_symbol *) insn->data; |
| 1062 | |
| 1063 | dbg_printk("Validate get symbol field offset %u\n", sym->offset); |
| 1064 | break; |
| 1065 | } |
| 1066 | |
| 1067 | case FILTER_OP_GET_INDEX_U16: |
| 1068 | { |
| 1069 | struct load_op *insn = (struct load_op *) pc; |
| 1070 | struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data; |
| 1071 | |
| 1072 | dbg_printk("Validate get index u16 index %u\n", get_index->index); |
| 1073 | break; |
| 1074 | } |
| 1075 | |
| 1076 | case FILTER_OP_GET_INDEX_U64: |
| 1077 | { |
| 1078 | struct load_op *insn = (struct load_op *) pc; |
| 1079 | struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data; |
| 1080 | |
| 1081 | dbg_printk("Validate get index u64 index %llu\n", |
| 1082 | (unsigned long long) get_index->index); |
| 1083 | break; |
| 1084 | } |
| 1085 | } |
| 1086 | end: |
| 1087 | return ret; |
| 1088 | } |
| 1089 | |
| 1090 | /* |
| 1091 | * Return value: |
| 1092 | * 0: success |
| 1093 | * <0: error |
| 1094 | */ |
| 1095 | static |
| 1096 | int validate_instruction_all_contexts(struct bytecode_runtime *bytecode, |
| 1097 | struct mp_table *mp_table, |
| 1098 | struct vstack *stack, |
| 1099 | char *start_pc, |
| 1100 | char *pc) |
| 1101 | { |
| 1102 | int ret, found = 0; |
| 1103 | unsigned long target_pc = pc - start_pc; |
| 1104 | unsigned long hash; |
| 1105 | struct hlist_head *head; |
| 1106 | struct mp_node *mp_node; |
| 1107 | |
| 1108 | /* Validate the context resulting from the previous instruction */ |
| 1109 | ret = validate_instruction_context(bytecode, stack, start_pc, pc); |
| 1110 | if (ret < 0) |
| 1111 | return ret; |
| 1112 | |
| 1113 | /* Validate merge points */ |
| 1114 | hash = jhash_1word(target_pc, 0); |
| 1115 | head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)]; |
| 1116 | lttng_hlist_for_each_entry(mp_node, head, node) { |
| 1117 | if (lttng_hash_match(mp_node, target_pc)) { |
| 1118 | found = 1; |
| 1119 | break; |
| 1120 | } |
| 1121 | } |
| 1122 | if (found) { |
| 1123 | dbg_printk("Filter: validate merge point at offset %lu\n", |
| 1124 | target_pc); |
| 1125 | if (merge_points_compare(stack, &mp_node->stack)) { |
| 1126 | printk(KERN_WARNING "Merge points differ for offset %lu\n", |
| 1127 | target_pc); |
| 1128 | return -EINVAL; |
| 1129 | } |
| 1130 | /* Once validated, we can remove the merge point */ |
| 1131 | dbg_printk("Filter: remove merge point at offset %lu\n", |
| 1132 | target_pc); |
| 1133 | hlist_del(&mp_node->node); |
| 1134 | } |
| 1135 | return 0; |
| 1136 | } |
| 1137 | |
| 1138 | /* |
| 1139 | * Return value: |
| 1140 | * >0: going to next insn. |
| 1141 | * 0: success, stop iteration. |
| 1142 | * <0: error |
| 1143 | */ |
| 1144 | static |
| 1145 | int exec_insn(struct bytecode_runtime *bytecode, |
| 1146 | struct mp_table *mp_table, |
| 1147 | struct vstack *stack, |
| 1148 | char **_next_pc, |
| 1149 | char *pc) |
| 1150 | { |
| 1151 | int ret = 1; |
| 1152 | char *next_pc = *_next_pc; |
| 1153 | |
| 1154 | switch (*(filter_opcode_t *) pc) { |
| 1155 | case FILTER_OP_UNKNOWN: |
| 1156 | default: |
| 1157 | { |
| 1158 | printk(KERN_WARNING "unknown bytecode op %u\n", |
| 1159 | (unsigned int) *(filter_opcode_t *) pc); |
| 1160 | ret = -EINVAL; |
| 1161 | goto end; |
| 1162 | } |
| 1163 | |
| 1164 | case FILTER_OP_RETURN: |
| 1165 | { |
| 1166 | if (!vstack_ax(stack)) { |
| 1167 | printk(KERN_WARNING "Empty stack\n"); |
| 1168 | ret = -EINVAL; |
| 1169 | goto end; |
| 1170 | } |
| 1171 | switch (vstack_ax(stack)->type) { |
| 1172 | case REG_S64: |
| 1173 | case REG_TYPE_UNKNOWN: |
| 1174 | break; |
| 1175 | default: |
| 1176 | printk(KERN_WARNING "Unexpected register type %d at end of bytecode\n", |
| 1177 | (int) vstack_ax(stack)->type); |
| 1178 | ret = -EINVAL; |
| 1179 | goto end; |
| 1180 | } |
| 1181 | |
| 1182 | ret = 0; |
| 1183 | goto end; |
| 1184 | } |
| 1185 | |
| 1186 | /* binary */ |
| 1187 | case FILTER_OP_MUL: |
| 1188 | case FILTER_OP_DIV: |
| 1189 | case FILTER_OP_MOD: |
| 1190 | case FILTER_OP_PLUS: |
| 1191 | case FILTER_OP_MINUS: |
| 1192 | /* Floating point */ |
| 1193 | case FILTER_OP_EQ_DOUBLE: |
| 1194 | case FILTER_OP_NE_DOUBLE: |
| 1195 | case FILTER_OP_GT_DOUBLE: |
| 1196 | case FILTER_OP_LT_DOUBLE: |
| 1197 | case FILTER_OP_GE_DOUBLE: |
| 1198 | case FILTER_OP_LE_DOUBLE: |
| 1199 | case FILTER_OP_EQ_DOUBLE_S64: |
| 1200 | case FILTER_OP_NE_DOUBLE_S64: |
| 1201 | case FILTER_OP_GT_DOUBLE_S64: |
| 1202 | case FILTER_OP_LT_DOUBLE_S64: |
| 1203 | case FILTER_OP_GE_DOUBLE_S64: |
| 1204 | case FILTER_OP_LE_DOUBLE_S64: |
| 1205 | case FILTER_OP_EQ_S64_DOUBLE: |
| 1206 | case FILTER_OP_NE_S64_DOUBLE: |
| 1207 | case FILTER_OP_GT_S64_DOUBLE: |
| 1208 | case FILTER_OP_LT_S64_DOUBLE: |
| 1209 | case FILTER_OP_GE_S64_DOUBLE: |
| 1210 | case FILTER_OP_LE_S64_DOUBLE: |
| 1211 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 1212 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 1213 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 1214 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 1215 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
| 1216 | case FILTER_OP_LOAD_DOUBLE: |
| 1217 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 1218 | { |
| 1219 | printk(KERN_WARNING "unsupported bytecode op %u\n", |
| 1220 | (unsigned int) *(filter_opcode_t *) pc); |
| 1221 | ret = -EINVAL; |
| 1222 | goto end; |
| 1223 | } |
| 1224 | |
| 1225 | case FILTER_OP_EQ: |
| 1226 | case FILTER_OP_NE: |
| 1227 | case FILTER_OP_GT: |
| 1228 | case FILTER_OP_LT: |
| 1229 | case FILTER_OP_GE: |
| 1230 | case FILTER_OP_LE: |
| 1231 | case FILTER_OP_EQ_STRING: |
| 1232 | case FILTER_OP_NE_STRING: |
| 1233 | case FILTER_OP_GT_STRING: |
| 1234 | case FILTER_OP_LT_STRING: |
| 1235 | case FILTER_OP_GE_STRING: |
| 1236 | case FILTER_OP_LE_STRING: |
| 1237 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
| 1238 | case FILTER_OP_NE_STAR_GLOB_STRING: |
| 1239 | case FILTER_OP_EQ_S64: |
| 1240 | case FILTER_OP_NE_S64: |
| 1241 | case FILTER_OP_GT_S64: |
| 1242 | case FILTER_OP_LT_S64: |
| 1243 | case FILTER_OP_GE_S64: |
| 1244 | case FILTER_OP_LE_S64: |
| 1245 | case FILTER_OP_BIT_RSHIFT: |
| 1246 | case FILTER_OP_BIT_LSHIFT: |
| 1247 | case FILTER_OP_BIT_AND: |
| 1248 | case FILTER_OP_BIT_OR: |
| 1249 | case FILTER_OP_BIT_XOR: |
| 1250 | { |
| 1251 | /* Pop 2, push 1 */ |
| 1252 | if (vstack_pop(stack)) { |
| 1253 | ret = -EINVAL; |
| 1254 | goto end; |
| 1255 | } |
| 1256 | if (!vstack_ax(stack)) { |
| 1257 | printk(KERN_WARNING "Empty stack\n"); |
| 1258 | ret = -EINVAL; |
| 1259 | goto end; |
| 1260 | } |
| 1261 | switch (vstack_ax(stack)->type) { |
| 1262 | case REG_S64: |
| 1263 | case REG_DOUBLE: |
| 1264 | case REG_STRING: |
| 1265 | case REG_STAR_GLOB_STRING: |
| 1266 | case REG_TYPE_UNKNOWN: |
| 1267 | break; |
| 1268 | default: |
| 1269 | printk(KERN_WARNING "Unexpected register type %d for operation\n", |
| 1270 | (int) vstack_ax(stack)->type); |
| 1271 | ret = -EINVAL; |
| 1272 | goto end; |
| 1273 | } |
| 1274 | |
| 1275 | vstack_ax(stack)->type = REG_S64; |
| 1276 | next_pc += sizeof(struct binary_op); |
| 1277 | break; |
| 1278 | } |
| 1279 | |
| 1280 | /* unary */ |
| 1281 | case FILTER_OP_UNARY_PLUS: |
| 1282 | case FILTER_OP_UNARY_MINUS: |
| 1283 | { |
| 1284 | /* Pop 1, push 1 */ |
| 1285 | if (!vstack_ax(stack)) { |
| 1286 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1287 | ret = -EINVAL; |
| 1288 | goto end; |
| 1289 | } |
| 1290 | switch (vstack_ax(stack)->type) { |
| 1291 | case REG_S64: |
| 1292 | case REG_TYPE_UNKNOWN: |
| 1293 | break; |
| 1294 | default: |
| 1295 | printk(KERN_WARNING "Unexpected register type %d for operation\n", |
| 1296 | (int) vstack_ax(stack)->type); |
| 1297 | ret = -EINVAL; |
| 1298 | goto end; |
| 1299 | } |
| 1300 | |
| 1301 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; |
| 1302 | next_pc += sizeof(struct unary_op); |
| 1303 | break; |
| 1304 | } |
| 1305 | |
| 1306 | case FILTER_OP_UNARY_PLUS_S64: |
| 1307 | case FILTER_OP_UNARY_MINUS_S64: |
| 1308 | case FILTER_OP_UNARY_NOT_S64: |
| 1309 | { |
| 1310 | /* Pop 1, push 1 */ |
| 1311 | if (!vstack_ax(stack)) { |
| 1312 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1313 | ret = -EINVAL; |
| 1314 | goto end; |
| 1315 | } |
| 1316 | switch (vstack_ax(stack)->type) { |
| 1317 | case REG_S64: |
| 1318 | break; |
| 1319 | default: |
| 1320 | printk(KERN_WARNING "Unexpected register type %d for operation\n", |
| 1321 | (int) vstack_ax(stack)->type); |
| 1322 | ret = -EINVAL; |
| 1323 | goto end; |
| 1324 | } |
| 1325 | |
| 1326 | vstack_ax(stack)->type = REG_S64; |
| 1327 | next_pc += sizeof(struct unary_op); |
| 1328 | break; |
| 1329 | } |
| 1330 | |
| 1331 | case FILTER_OP_UNARY_NOT: |
| 1332 | { |
| 1333 | /* Pop 1, push 1 */ |
| 1334 | if (!vstack_ax(stack)) { |
| 1335 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1336 | ret = -EINVAL; |
| 1337 | goto end; |
| 1338 | } |
| 1339 | switch (vstack_ax(stack)->type) { |
| 1340 | case REG_S64: |
| 1341 | case REG_TYPE_UNKNOWN: |
| 1342 | break; |
| 1343 | default: |
| 1344 | printk(KERN_WARNING "Unexpected register type %d for operation\n", |
| 1345 | (int) vstack_ax(stack)->type); |
| 1346 | ret = -EINVAL; |
| 1347 | goto end; |
| 1348 | } |
| 1349 | |
| 1350 | vstack_ax(stack)->type = REG_S64; |
| 1351 | next_pc += sizeof(struct unary_op); |
| 1352 | break; |
| 1353 | } |
| 1354 | |
| 1355 | case FILTER_OP_UNARY_BIT_NOT: |
| 1356 | { |
| 1357 | /* Pop 1, push 1 */ |
| 1358 | if (!vstack_ax(stack)) { |
| 1359 | printk(KERN_WARNING "Empty stack\n"); |
| 1360 | ret = -EINVAL; |
| 1361 | goto end; |
| 1362 | } |
| 1363 | switch (vstack_ax(stack)->type) { |
| 1364 | case REG_S64: |
| 1365 | case REG_TYPE_UNKNOWN: |
| 1366 | break; |
| 1367 | case REG_DOUBLE: |
| 1368 | default: |
| 1369 | printk(KERN_WARNING "Unexpected register type %d for operation\n", |
| 1370 | (int) vstack_ax(stack)->type); |
| 1371 | ret = -EINVAL; |
| 1372 | goto end; |
| 1373 | } |
| 1374 | |
| 1375 | vstack_ax(stack)->type = REG_S64; |
| 1376 | next_pc += sizeof(struct unary_op); |
| 1377 | break; |
| 1378 | } |
| 1379 | |
| 1380 | /* logical */ |
| 1381 | case FILTER_OP_AND: |
| 1382 | case FILTER_OP_OR: |
| 1383 | { |
| 1384 | struct logical_op *insn = (struct logical_op *) pc; |
| 1385 | int merge_ret; |
| 1386 | |
| 1387 | /* Add merge point to table */ |
| 1388 | merge_ret = merge_point_add_check(mp_table, |
| 1389 | insn->skip_offset, stack); |
| 1390 | if (merge_ret) { |
| 1391 | ret = merge_ret; |
| 1392 | goto end; |
| 1393 | } |
| 1394 | |
| 1395 | if (!vstack_ax(stack)) { |
| 1396 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1397 | ret = -EINVAL; |
| 1398 | goto end; |
| 1399 | } |
| 1400 | /* There is always a cast-to-s64 operation before a or/and op. */ |
| 1401 | switch (vstack_ax(stack)->type) { |
| 1402 | case REG_S64: |
| 1403 | break; |
| 1404 | default: |
| 1405 | printk(KERN_WARNING "Incorrect register type %d for operation\n", |
| 1406 | (int) vstack_ax(stack)->type); |
| 1407 | ret = -EINVAL; |
| 1408 | goto end; |
| 1409 | } |
| 1410 | |
| 1411 | /* Continue to next instruction */ |
| 1412 | /* Pop 1 when jump not taken */ |
| 1413 | if (vstack_pop(stack)) { |
| 1414 | ret = -EINVAL; |
| 1415 | goto end; |
| 1416 | } |
| 1417 | next_pc += sizeof(struct logical_op); |
| 1418 | break; |
| 1419 | } |
| 1420 | |
| 1421 | /* load field ref */ |
| 1422 | case FILTER_OP_LOAD_FIELD_REF: |
| 1423 | { |
| 1424 | printk(KERN_WARNING "Unknown field ref type\n"); |
| 1425 | ret = -EINVAL; |
| 1426 | goto end; |
| 1427 | } |
| 1428 | /* get context ref */ |
| 1429 | case FILTER_OP_GET_CONTEXT_REF: |
| 1430 | { |
| 1431 | printk(KERN_WARNING "Unknown get context ref type\n"); |
| 1432 | ret = -EINVAL; |
| 1433 | goto end; |
| 1434 | } |
| 1435 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 1436 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 1437 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
| 1438 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
| 1439 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: |
| 1440 | { |
| 1441 | if (vstack_push(stack)) { |
| 1442 | ret = -EINVAL; |
| 1443 | goto end; |
| 1444 | } |
| 1445 | vstack_ax(stack)->type = REG_STRING; |
| 1446 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1447 | break; |
| 1448 | } |
| 1449 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 1450 | case FILTER_OP_GET_CONTEXT_REF_S64: |
| 1451 | { |
| 1452 | if (vstack_push(stack)) { |
| 1453 | ret = -EINVAL; |
| 1454 | goto end; |
| 1455 | } |
| 1456 | vstack_ax(stack)->type = REG_S64; |
| 1457 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1458 | break; |
| 1459 | } |
| 1460 | |
| 1461 | /* load from immediate operand */ |
| 1462 | case FILTER_OP_LOAD_STRING: |
| 1463 | { |
| 1464 | struct load_op *insn = (struct load_op *) pc; |
| 1465 | |
| 1466 | if (vstack_push(stack)) { |
| 1467 | ret = -EINVAL; |
| 1468 | goto end; |
| 1469 | } |
| 1470 | vstack_ax(stack)->type = REG_STRING; |
| 1471 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 1472 | break; |
| 1473 | } |
| 1474 | |
| 1475 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
| 1476 | { |
| 1477 | struct load_op *insn = (struct load_op *) pc; |
| 1478 | |
| 1479 | if (vstack_push(stack)) { |
| 1480 | ret = -EINVAL; |
| 1481 | goto end; |
| 1482 | } |
| 1483 | vstack_ax(stack)->type = REG_STAR_GLOB_STRING; |
| 1484 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 1485 | break; |
| 1486 | } |
| 1487 | |
| 1488 | case FILTER_OP_LOAD_S64: |
| 1489 | { |
| 1490 | if (vstack_push(stack)) { |
| 1491 | ret = -EINVAL; |
| 1492 | goto end; |
| 1493 | } |
| 1494 | vstack_ax(stack)->type = REG_S64; |
| 1495 | next_pc += sizeof(struct load_op) |
| 1496 | + sizeof(struct literal_numeric); |
| 1497 | break; |
| 1498 | } |
| 1499 | |
| 1500 | case FILTER_OP_CAST_TO_S64: |
| 1501 | { |
| 1502 | /* Pop 1, push 1 */ |
| 1503 | if (!vstack_ax(stack)) { |
| 1504 | printk(KERN_WARNING "Empty stack\n"); |
| 1505 | ret = -EINVAL; |
| 1506 | goto end; |
| 1507 | } |
| 1508 | switch (vstack_ax(stack)->type) { |
| 1509 | case REG_S64: |
| 1510 | case REG_DOUBLE: |
| 1511 | case REG_TYPE_UNKNOWN: |
| 1512 | break; |
| 1513 | default: |
| 1514 | printk(KERN_WARNING "Incorrect register type %d for cast\n", |
| 1515 | (int) vstack_ax(stack)->type); |
| 1516 | ret = -EINVAL; |
| 1517 | goto end; |
| 1518 | } |
| 1519 | vstack_ax(stack)->type = REG_S64; |
| 1520 | next_pc += sizeof(struct cast_op); |
| 1521 | break; |
| 1522 | } |
| 1523 | case FILTER_OP_CAST_NOP: |
| 1524 | { |
| 1525 | next_pc += sizeof(struct cast_op); |
| 1526 | break; |
| 1527 | } |
| 1528 | |
| 1529 | /* |
| 1530 | * Instructions for recursive traversal through composed types. |
| 1531 | */ |
| 1532 | case FILTER_OP_GET_CONTEXT_ROOT: |
| 1533 | case FILTER_OP_GET_APP_CONTEXT_ROOT: |
| 1534 | case FILTER_OP_GET_PAYLOAD_ROOT: |
| 1535 | { |
| 1536 | if (vstack_push(stack)) { |
| 1537 | ret = -EINVAL; |
| 1538 | goto end; |
| 1539 | } |
| 1540 | vstack_ax(stack)->type = REG_PTR; |
| 1541 | next_pc += sizeof(struct load_op); |
| 1542 | break; |
| 1543 | } |
| 1544 | |
| 1545 | case FILTER_OP_LOAD_FIELD: |
| 1546 | { |
| 1547 | /* Pop 1, push 1 */ |
| 1548 | if (!vstack_ax(stack)) { |
| 1549 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1550 | ret = -EINVAL; |
| 1551 | goto end; |
| 1552 | } |
| 1553 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1554 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); |
| 1555 | ret = -EINVAL; |
| 1556 | goto end; |
| 1557 | } |
| 1558 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; |
| 1559 | next_pc += sizeof(struct load_op); |
| 1560 | break; |
| 1561 | } |
| 1562 | |
| 1563 | case FILTER_OP_LOAD_FIELD_S8: |
| 1564 | case FILTER_OP_LOAD_FIELD_S16: |
| 1565 | case FILTER_OP_LOAD_FIELD_S32: |
| 1566 | case FILTER_OP_LOAD_FIELD_S64: |
| 1567 | case FILTER_OP_LOAD_FIELD_U8: |
| 1568 | case FILTER_OP_LOAD_FIELD_U16: |
| 1569 | case FILTER_OP_LOAD_FIELD_U32: |
| 1570 | case FILTER_OP_LOAD_FIELD_U64: |
| 1571 | { |
| 1572 | /* Pop 1, push 1 */ |
| 1573 | if (!vstack_ax(stack)) { |
| 1574 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1575 | ret = -EINVAL; |
| 1576 | goto end; |
| 1577 | } |
| 1578 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1579 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); |
| 1580 | ret = -EINVAL; |
| 1581 | goto end; |
| 1582 | } |
| 1583 | vstack_ax(stack)->type = REG_S64; |
| 1584 | next_pc += sizeof(struct load_op); |
| 1585 | break; |
| 1586 | } |
| 1587 | |
| 1588 | case FILTER_OP_LOAD_FIELD_STRING: |
| 1589 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
| 1590 | { |
| 1591 | /* Pop 1, push 1 */ |
| 1592 | if (!vstack_ax(stack)) { |
| 1593 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1594 | ret = -EINVAL; |
| 1595 | goto end; |
| 1596 | } |
| 1597 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1598 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); |
| 1599 | ret = -EINVAL; |
| 1600 | goto end; |
| 1601 | } |
| 1602 | vstack_ax(stack)->type = REG_STRING; |
| 1603 | next_pc += sizeof(struct load_op); |
| 1604 | break; |
| 1605 | } |
| 1606 | |
| 1607 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
| 1608 | { |
| 1609 | /* Pop 1, push 1 */ |
| 1610 | if (!vstack_ax(stack)) { |
| 1611 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1612 | ret = -EINVAL; |
| 1613 | goto end; |
| 1614 | } |
| 1615 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1616 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); |
| 1617 | ret = -EINVAL; |
| 1618 | goto end; |
| 1619 | } |
| 1620 | vstack_ax(stack)->type = REG_DOUBLE; |
| 1621 | next_pc += sizeof(struct load_op); |
| 1622 | break; |
| 1623 | } |
| 1624 | |
| 1625 | case FILTER_OP_GET_SYMBOL: |
| 1626 | case FILTER_OP_GET_SYMBOL_FIELD: |
| 1627 | { |
| 1628 | /* Pop 1, push 1 */ |
| 1629 | if (!vstack_ax(stack)) { |
| 1630 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1631 | ret = -EINVAL; |
| 1632 | goto end; |
| 1633 | } |
| 1634 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1635 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); |
| 1636 | ret = -EINVAL; |
| 1637 | goto end; |
| 1638 | } |
| 1639 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); |
| 1640 | break; |
| 1641 | } |
| 1642 | |
| 1643 | case FILTER_OP_GET_INDEX_U16: |
| 1644 | { |
| 1645 | /* Pop 1, push 1 */ |
| 1646 | if (!vstack_ax(stack)) { |
| 1647 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1648 | ret = -EINVAL; |
| 1649 | goto end; |
| 1650 | } |
| 1651 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1652 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); |
| 1653 | ret = -EINVAL; |
| 1654 | goto end; |
| 1655 | } |
| 1656 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); |
| 1657 | break; |
| 1658 | } |
| 1659 | |
| 1660 | case FILTER_OP_GET_INDEX_U64: |
| 1661 | { |
| 1662 | /* Pop 1, push 1 */ |
| 1663 | if (!vstack_ax(stack)) { |
| 1664 | printk(KERN_WARNING "Empty stack\n\n"); |
| 1665 | ret = -EINVAL; |
| 1666 | goto end; |
| 1667 | } |
| 1668 | if (vstack_ax(stack)->type != REG_PTR) { |
| 1669 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); |
| 1670 | ret = -EINVAL; |
| 1671 | goto end; |
| 1672 | } |
| 1673 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); |
| 1674 | break; |
| 1675 | } |
| 1676 | |
| 1677 | } |
| 1678 | end: |
| 1679 | *_next_pc = next_pc; |
| 1680 | return ret; |
| 1681 | } |
| 1682 | |
| 1683 | /* |
| 1684 | * Never called concurrently (hash seed is shared). |
| 1685 | */ |
| 1686 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) |
| 1687 | { |
| 1688 | struct mp_table *mp_table; |
| 1689 | char *pc, *next_pc, *start_pc; |
| 1690 | int ret = -EINVAL; |
| 1691 | struct vstack stack; |
| 1692 | |
| 1693 | vstack_init(&stack); |
| 1694 | |
| 1695 | mp_table = kzalloc(sizeof(*mp_table), GFP_KERNEL); |
| 1696 | if (!mp_table) { |
| 1697 | printk(KERN_WARNING "Error allocating hash table for bytecode validation\n"); |
| 1698 | return -ENOMEM; |
| 1699 | } |
| 1700 | start_pc = &bytecode->code[0]; |
| 1701 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
| 1702 | pc = next_pc) { |
| 1703 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); |
| 1704 | if (ret != 0) { |
| 1705 | if (ret == -ERANGE) |
| 1706 | printk(KERN_WARNING "filter bytecode overflow\n"); |
| 1707 | goto end; |
| 1708 | } |
| 1709 | dbg_printk("Validating op %s (%u)\n", |
| 1710 | lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), |
| 1711 | (unsigned int) *(filter_opcode_t *) pc); |
| 1712 | |
| 1713 | /* |
| 1714 | * For each instruction, validate the current context |
| 1715 | * (traversal of entire execution flow), and validate |
| 1716 | * all merge points targeting this instruction. |
| 1717 | */ |
| 1718 | ret = validate_instruction_all_contexts(bytecode, mp_table, |
| 1719 | &stack, start_pc, pc); |
| 1720 | if (ret) |
| 1721 | goto end; |
| 1722 | ret = exec_insn(bytecode, mp_table, &stack, &next_pc, pc); |
| 1723 | if (ret <= 0) |
| 1724 | goto end; |
| 1725 | } |
| 1726 | end: |
| 1727 | if (delete_all_nodes(mp_table)) { |
| 1728 | if (!ret) { |
| 1729 | printk(KERN_WARNING "Unexpected merge points\n"); |
| 1730 | ret = -EINVAL; |
| 1731 | } |
| 1732 | } |
| 1733 | kfree(mp_table); |
| 1734 | return ret; |
| 1735 | } |