| 1 | /* |
| 2 | * lttng-filter.c |
| 3 | * |
| 4 | * LTTng UST filter code. |
| 5 | * |
| 6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * This library is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; only |
| 11 | * version 2.1 of the License. |
| 12 | * |
| 13 | * This library is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with this library; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include <errno.h> |
| 24 | #include <stdio.h> |
| 25 | #include <helper.h> |
| 26 | #include <lttng/ust-events.h> |
| 27 | #include <stdint.h> |
| 28 | #include <errno.h> |
| 29 | #include <string.h> |
| 30 | #include <inttypes.h> |
| 31 | #include <limits.h> |
| 32 | #include <usterr-signal-safe.h> |
| 33 | #include "filter-bytecode.h" |
| 34 | |
| 35 | #define NR_REG 2 |
| 36 | |
| 37 | #ifndef min_t |
| 38 | #define min_t(type, a, b) \ |
| 39 | ((type) (a) < (type) (b) ? (type) (a) : (type) (b)) |
| 40 | #endif |
| 41 | |
| 42 | #ifndef likely |
| 43 | #define likely(x) __builtin_expect(!!(x), 1) |
| 44 | #endif |
| 45 | |
| 46 | #ifndef unlikely |
| 47 | #define unlikely(x) __builtin_expect(!!(x), 0) |
| 48 | #endif |
| 49 | |
| 50 | #ifdef DEBUG |
| 51 | #define dbg_printf(fmt, args...) printf("[debug bytecode] " fmt, ## args) |
| 52 | #else |
| 53 | #define dbg_printf(fmt, args...) \ |
| 54 | do { \ |
| 55 | /* do nothing but check printf format */ \ |
| 56 | if (0) \ |
| 57 | printf("[debug bytecode] " fmt, ## args); \ |
| 58 | } while (0) |
| 59 | #endif |
| 60 | |
| 61 | /* Linked bytecode */ |
| 62 | struct bytecode_runtime { |
| 63 | uint16_t len; |
| 64 | char data[0]; |
| 65 | }; |
| 66 | |
| 67 | enum reg_type { |
| 68 | REG_S64, |
| 69 | REG_DOUBLE, |
| 70 | REG_STRING, |
| 71 | REG_TYPE_UNKNOWN, |
| 72 | }; |
| 73 | |
| 74 | /* Validation registers */ |
| 75 | struct vreg { |
| 76 | enum reg_type type; |
| 77 | int literal; /* is string literal ? */ |
| 78 | }; |
| 79 | |
| 80 | /* Execution registers */ |
| 81 | struct reg { |
| 82 | enum reg_type type; |
| 83 | int64_t v; |
| 84 | double d; |
| 85 | |
| 86 | const char *str; |
| 87 | size_t seq_len; |
| 88 | int literal; /* is string literal ? */ |
| 89 | }; |
| 90 | |
| 91 | static const char *opnames[] = { |
| 92 | [ FILTER_OP_UNKNOWN ] = "UNKNOWN", |
| 93 | |
| 94 | [ FILTER_OP_RETURN ] = "RETURN", |
| 95 | |
| 96 | /* binary */ |
| 97 | [ FILTER_OP_MUL ] = "MUL", |
| 98 | [ FILTER_OP_DIV ] = "DIV", |
| 99 | [ FILTER_OP_MOD ] = "MOD", |
| 100 | [ FILTER_OP_PLUS ] = "PLUS", |
| 101 | [ FILTER_OP_MINUS ] = "MINUS", |
| 102 | [ FILTER_OP_RSHIFT ] = "RSHIFT", |
| 103 | [ FILTER_OP_LSHIFT ] = "LSHIFT", |
| 104 | [ FILTER_OP_BIN_AND ] = "BIN_AND", |
| 105 | [ FILTER_OP_BIN_OR ] = "BIN_OR", |
| 106 | [ FILTER_OP_BIN_XOR ] = "BIN_XOR", |
| 107 | [ FILTER_OP_EQ ] = "EQ", |
| 108 | [ FILTER_OP_NE ] = "NE", |
| 109 | [ FILTER_OP_GT ] = "GT", |
| 110 | [ FILTER_OP_LT ] = "LT", |
| 111 | [ FILTER_OP_GE ] = "GE", |
| 112 | [ FILTER_OP_LE ] = "LE", |
| 113 | |
| 114 | /* unary */ |
| 115 | [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS", |
| 116 | [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS", |
| 117 | [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT", |
| 118 | |
| 119 | /* logical */ |
| 120 | [ FILTER_OP_AND ] = "AND", |
| 121 | [ FILTER_OP_OR ] = "OR", |
| 122 | |
| 123 | /* load */ |
| 124 | [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF", |
| 125 | [ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING", |
| 126 | [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE", |
| 127 | [ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64", |
| 128 | [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE", |
| 129 | |
| 130 | [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING", |
| 131 | [ FILTER_OP_LOAD_S64 ] = "LOAD_S64", |
| 132 | [ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", |
| 133 | }; |
| 134 | |
| 135 | static |
| 136 | const char *print_op(enum filter_op op) |
| 137 | { |
| 138 | if (op >= NR_FILTER_OPS) |
| 139 | return "UNKNOWN"; |
| 140 | else |
| 141 | return opnames[op]; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * -1: wildcard found. |
| 146 | * -2: unknown escape char. |
| 147 | * 0: normal char. |
| 148 | */ |
| 149 | |
| 150 | static |
| 151 | int parse_char(const char **p) |
| 152 | { |
| 153 | switch (**p) { |
| 154 | case '\\': |
| 155 | (*p)++; |
| 156 | switch (**p) { |
| 157 | case '\\': |
| 158 | case '*': |
| 159 | return 0; |
| 160 | default: |
| 161 | return -2; |
| 162 | } |
| 163 | case '*': |
| 164 | return -1; |
| 165 | default: |
| 166 | return 0; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | static |
| 171 | int reg_strcmp(struct reg reg[NR_REG], const char *cmp_type) |
| 172 | { |
| 173 | const char *p = reg[REG_R0].str, *q = reg[REG_R1].str; |
| 174 | int ret; |
| 175 | int diff; |
| 176 | |
| 177 | for (;;) { |
| 178 | int escaped_r0 = 0; |
| 179 | |
| 180 | if (unlikely(p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')) { |
| 181 | if (q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0') |
| 182 | diff = 0; |
| 183 | else |
| 184 | diff = -1; |
| 185 | break; |
| 186 | } |
| 187 | if (unlikely(q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')) { |
| 188 | if (p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0') |
| 189 | diff = 0; |
| 190 | else |
| 191 | diff = 1; |
| 192 | break; |
| 193 | } |
| 194 | if (reg[REG_R0].literal) { |
| 195 | ret = parse_char(&p); |
| 196 | if (ret == -1) { |
| 197 | return 0; |
| 198 | } else if (ret == -2) { |
| 199 | escaped_r0 = 1; |
| 200 | } |
| 201 | /* else compare both char */ |
| 202 | } |
| 203 | if (reg[REG_R1].literal) { |
| 204 | ret = parse_char(&q); |
| 205 | if (ret == -1) { |
| 206 | return 0; |
| 207 | } else if (ret == -2) { |
| 208 | if (!escaped_r0) |
| 209 | return -1; |
| 210 | } else { |
| 211 | if (escaped_r0) |
| 212 | return 1; |
| 213 | } |
| 214 | } else { |
| 215 | if (escaped_r0) |
| 216 | return 1; |
| 217 | } |
| 218 | diff = *p - *q; |
| 219 | if (diff != 0) |
| 220 | break; |
| 221 | p++; |
| 222 | q++; |
| 223 | } |
| 224 | return diff; |
| 225 | } |
| 226 | |
| 227 | static |
| 228 | int lttng_filter_false(void *filter_data, |
| 229 | const char *filter_stack_data) |
| 230 | { |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static |
| 235 | int lttng_filter_interpret_bytecode(void *filter_data, |
| 236 | const char *filter_stack_data) |
| 237 | { |
| 238 | struct bytecode_runtime *bytecode = filter_data; |
| 239 | void *pc, *next_pc, *start_pc; |
| 240 | int ret = -EINVAL; |
| 241 | int retval = 0; |
| 242 | struct reg reg[NR_REG]; |
| 243 | |
| 244 | start_pc = &bytecode->data[0]; |
| 245 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
| 246 | pc = next_pc) { |
| 247 | dbg_printf("Executing op %s (%u)\n", |
| 248 | print_op((unsigned int) *(filter_opcode_t *) pc), |
| 249 | (unsigned int) *(filter_opcode_t *) pc); |
| 250 | switch (*(filter_opcode_t *) pc) { |
| 251 | case FILTER_OP_UNKNOWN: |
| 252 | case FILTER_OP_LOAD_FIELD_REF: |
| 253 | default: |
| 254 | ERR("unknown bytecode op %u\n", |
| 255 | (unsigned int) *(filter_opcode_t *) pc); |
| 256 | ret = -EINVAL; |
| 257 | goto end; |
| 258 | |
| 259 | case FILTER_OP_RETURN: |
| 260 | retval = !!reg[0].v; |
| 261 | ret = 0; |
| 262 | goto end; |
| 263 | |
| 264 | /* binary */ |
| 265 | case FILTER_OP_MUL: |
| 266 | case FILTER_OP_DIV: |
| 267 | case FILTER_OP_MOD: |
| 268 | case FILTER_OP_PLUS: |
| 269 | case FILTER_OP_MINUS: |
| 270 | case FILTER_OP_RSHIFT: |
| 271 | case FILTER_OP_LSHIFT: |
| 272 | case FILTER_OP_BIN_AND: |
| 273 | case FILTER_OP_BIN_OR: |
| 274 | case FILTER_OP_BIN_XOR: |
| 275 | ERR("unsupported bytecode op %u\n", |
| 276 | (unsigned int) *(filter_opcode_t *) pc); |
| 277 | ret = -EINVAL; |
| 278 | goto end; |
| 279 | |
| 280 | case FILTER_OP_EQ: |
| 281 | { |
| 282 | switch (reg[REG_R0].type) { |
| 283 | default: |
| 284 | ERR("unknown register type\n"); |
| 285 | ret = -EINVAL; |
| 286 | goto end; |
| 287 | |
| 288 | case REG_STRING: |
| 289 | reg[REG_R0].v = (reg_strcmp(reg, "==") == 0); |
| 290 | break; |
| 291 | case REG_S64: |
| 292 | switch (reg[REG_R1].type) { |
| 293 | default: |
| 294 | ERR("unknown register type\n"); |
| 295 | ret = -EINVAL; |
| 296 | goto end; |
| 297 | |
| 298 | case REG_S64: |
| 299 | reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].v); |
| 300 | break; |
| 301 | case REG_DOUBLE: |
| 302 | reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].d); |
| 303 | break; |
| 304 | } |
| 305 | break; |
| 306 | case REG_DOUBLE: |
| 307 | switch (reg[REG_R1].type) { |
| 308 | default: |
| 309 | ERR("unknown register type\n"); |
| 310 | ret = -EINVAL; |
| 311 | goto end; |
| 312 | |
| 313 | case REG_S64: |
| 314 | reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].v); |
| 315 | break; |
| 316 | case REG_DOUBLE: |
| 317 | reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].d); |
| 318 | break; |
| 319 | } |
| 320 | break; |
| 321 | } |
| 322 | reg[REG_R0].type = REG_S64; |
| 323 | next_pc += sizeof(struct binary_op); |
| 324 | break; |
| 325 | } |
| 326 | case FILTER_OP_NE: |
| 327 | { |
| 328 | switch (reg[REG_R0].type) { |
| 329 | default: |
| 330 | ERR("unknown register type\n"); |
| 331 | ret = -EINVAL; |
| 332 | goto end; |
| 333 | |
| 334 | case REG_STRING: |
| 335 | reg[REG_R0].v = (reg_strcmp(reg, "!=") != 0); |
| 336 | break; |
| 337 | case REG_S64: |
| 338 | switch (reg[REG_R1].type) { |
| 339 | default: |
| 340 | ERR("unknown register type\n"); |
| 341 | ret = -EINVAL; |
| 342 | goto end; |
| 343 | |
| 344 | case REG_S64: |
| 345 | reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].v); |
| 346 | break; |
| 347 | case REG_DOUBLE: |
| 348 | reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].d); |
| 349 | break; |
| 350 | } |
| 351 | break; |
| 352 | case REG_DOUBLE: |
| 353 | switch (reg[REG_R1].type) { |
| 354 | default: |
| 355 | ERR("unknown register type\n"); |
| 356 | ret = -EINVAL; |
| 357 | goto end; |
| 358 | |
| 359 | case REG_S64: |
| 360 | reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].v); |
| 361 | break; |
| 362 | case REG_DOUBLE: |
| 363 | reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].d); |
| 364 | break; |
| 365 | } |
| 366 | break; |
| 367 | } |
| 368 | reg[REG_R0].type = REG_S64; |
| 369 | next_pc += sizeof(struct binary_op); |
| 370 | break; |
| 371 | } |
| 372 | case FILTER_OP_GT: |
| 373 | { |
| 374 | switch (reg[REG_R0].type) { |
| 375 | default: |
| 376 | ERR("unknown register type\n"); |
| 377 | ret = -EINVAL; |
| 378 | goto end; |
| 379 | |
| 380 | case REG_STRING: |
| 381 | reg[REG_R0].v = (reg_strcmp(reg, ">") > 0); |
| 382 | break; |
| 383 | case REG_S64: |
| 384 | switch (reg[REG_R1].type) { |
| 385 | default: |
| 386 | ERR("unknown register type\n"); |
| 387 | ret = -EINVAL; |
| 388 | goto end; |
| 389 | |
| 390 | case REG_S64: |
| 391 | reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].v); |
| 392 | break; |
| 393 | case REG_DOUBLE: |
| 394 | reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].d); |
| 395 | break; |
| 396 | } |
| 397 | break; |
| 398 | case REG_DOUBLE: |
| 399 | switch (reg[REG_R1].type) { |
| 400 | default: |
| 401 | ERR("unknown register type\n"); |
| 402 | ret = -EINVAL; |
| 403 | goto end; |
| 404 | |
| 405 | case REG_S64: |
| 406 | reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].v); |
| 407 | break; |
| 408 | case REG_DOUBLE: |
| 409 | reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].d); |
| 410 | break; |
| 411 | } |
| 412 | break; |
| 413 | } |
| 414 | reg[REG_R0].type = REG_S64; |
| 415 | next_pc += sizeof(struct binary_op); |
| 416 | break; |
| 417 | } |
| 418 | case FILTER_OP_LT: |
| 419 | { |
| 420 | switch (reg[REG_R0].type) { |
| 421 | default: |
| 422 | ERR("unknown register type\n"); |
| 423 | ret = -EINVAL; |
| 424 | goto end; |
| 425 | |
| 426 | case REG_STRING: |
| 427 | reg[REG_R0].v = (reg_strcmp(reg, "<") < 0); |
| 428 | break; |
| 429 | case REG_S64: |
| 430 | switch (reg[REG_R1].type) { |
| 431 | default: |
| 432 | ERR("unknown register type\n"); |
| 433 | ret = -EINVAL; |
| 434 | goto end; |
| 435 | |
| 436 | case REG_S64: |
| 437 | reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].v); |
| 438 | break; |
| 439 | case REG_DOUBLE: |
| 440 | reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].d); |
| 441 | break; |
| 442 | } |
| 443 | break; |
| 444 | case REG_DOUBLE: |
| 445 | switch (reg[REG_R1].type) { |
| 446 | default: |
| 447 | ERR("unknown register type\n"); |
| 448 | ret = -EINVAL; |
| 449 | goto end; |
| 450 | |
| 451 | case REG_S64: |
| 452 | reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].v); |
| 453 | break; |
| 454 | case REG_DOUBLE: |
| 455 | reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].d); |
| 456 | break; |
| 457 | } |
| 458 | break; |
| 459 | } |
| 460 | reg[REG_R0].type = REG_S64; |
| 461 | next_pc += sizeof(struct binary_op); |
| 462 | break; |
| 463 | } |
| 464 | case FILTER_OP_GE: |
| 465 | { |
| 466 | switch (reg[REG_R0].type) { |
| 467 | default: |
| 468 | ERR("unknown register type\n"); |
| 469 | ret = -EINVAL; |
| 470 | goto end; |
| 471 | |
| 472 | case REG_STRING: |
| 473 | reg[REG_R0].v = (reg_strcmp(reg, ">=") >= 0); |
| 474 | break; |
| 475 | case REG_S64: |
| 476 | switch (reg[REG_R1].type) { |
| 477 | default: |
| 478 | ERR("unknown register type\n"); |
| 479 | ret = -EINVAL; |
| 480 | goto end; |
| 481 | |
| 482 | case REG_S64: |
| 483 | reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].v); |
| 484 | break; |
| 485 | case REG_DOUBLE: |
| 486 | reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].d); |
| 487 | break; |
| 488 | } |
| 489 | break; |
| 490 | case REG_DOUBLE: |
| 491 | switch (reg[REG_R1].type) { |
| 492 | default: |
| 493 | ERR("unknown register type\n"); |
| 494 | ret = -EINVAL; |
| 495 | goto end; |
| 496 | |
| 497 | case REG_S64: |
| 498 | reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].v); |
| 499 | break; |
| 500 | case REG_DOUBLE: |
| 501 | reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].d); |
| 502 | break; |
| 503 | } |
| 504 | break; |
| 505 | } |
| 506 | reg[REG_R0].type = REG_S64; |
| 507 | next_pc += sizeof(struct binary_op); |
| 508 | break; |
| 509 | } |
| 510 | case FILTER_OP_LE: |
| 511 | { |
| 512 | switch (reg[REG_R0].type) { |
| 513 | default: |
| 514 | ERR("unknown register type\n"); |
| 515 | ret = -EINVAL; |
| 516 | goto end; |
| 517 | |
| 518 | case REG_STRING: |
| 519 | reg[REG_R0].v = (reg_strcmp(reg, "<=") <= 0); |
| 520 | break; |
| 521 | case REG_S64: |
| 522 | switch (reg[REG_R1].type) { |
| 523 | default: |
| 524 | ERR("unknown register type\n"); |
| 525 | ret = -EINVAL; |
| 526 | goto end; |
| 527 | |
| 528 | case REG_S64: |
| 529 | reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].v); |
| 530 | break; |
| 531 | case REG_DOUBLE: |
| 532 | reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].d); |
| 533 | break; |
| 534 | } |
| 535 | break; |
| 536 | case REG_DOUBLE: |
| 537 | switch (reg[REG_R1].type) { |
| 538 | default: |
| 539 | ERR("unknown register type\n"); |
| 540 | ret = -EINVAL; |
| 541 | goto end; |
| 542 | |
| 543 | case REG_S64: |
| 544 | reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].v); |
| 545 | break; |
| 546 | case REG_DOUBLE: |
| 547 | reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].d); |
| 548 | break; |
| 549 | } |
| 550 | break; |
| 551 | } |
| 552 | reg[REG_R0].type = REG_S64; |
| 553 | next_pc += sizeof(struct binary_op); |
| 554 | break; |
| 555 | } |
| 556 | |
| 557 | /* unary */ |
| 558 | case FILTER_OP_UNARY_PLUS: |
| 559 | { |
| 560 | next_pc += sizeof(struct unary_op); |
| 561 | break; |
| 562 | } |
| 563 | case FILTER_OP_UNARY_MINUS: |
| 564 | { |
| 565 | struct unary_op *insn = (struct unary_op *) pc; |
| 566 | |
| 567 | switch (reg[insn->reg].type) { |
| 568 | default: |
| 569 | ERR("unknown register type\n"); |
| 570 | ret = -EINVAL; |
| 571 | goto end; |
| 572 | |
| 573 | case REG_STRING: |
| 574 | ERR("Unary minus can only be applied to numeric or floating point registers\n"); |
| 575 | ret = -EINVAL; |
| 576 | goto end; |
| 577 | case REG_S64: |
| 578 | reg[insn->reg].v = -reg[insn->reg].v; |
| 579 | break; |
| 580 | case REG_DOUBLE: |
| 581 | reg[insn->reg].d = -reg[insn->reg].d; |
| 582 | break; |
| 583 | } |
| 584 | next_pc += sizeof(struct unary_op); |
| 585 | break; |
| 586 | } |
| 587 | case FILTER_OP_UNARY_NOT: |
| 588 | { |
| 589 | struct unary_op *insn = (struct unary_op *) pc; |
| 590 | |
| 591 | switch (reg[insn->reg].type) { |
| 592 | default: |
| 593 | ERR("unknown register type\n"); |
| 594 | ret = -EINVAL; |
| 595 | goto end; |
| 596 | |
| 597 | case REG_STRING: |
| 598 | ERR("Unary not can only be applied to numeric or floating point registers\n"); |
| 599 | ret = -EINVAL; |
| 600 | goto end; |
| 601 | case REG_S64: |
| 602 | reg[insn->reg].v = !reg[insn->reg].v; |
| 603 | break; |
| 604 | case REG_DOUBLE: |
| 605 | reg[insn->reg].d = !reg[insn->reg].d; |
| 606 | break; |
| 607 | } |
| 608 | reg[insn->reg].v = !reg[insn->reg].v; |
| 609 | next_pc += sizeof(struct unary_op); |
| 610 | break; |
| 611 | } |
| 612 | /* logical */ |
| 613 | case FILTER_OP_AND: |
| 614 | { |
| 615 | struct logical_op *insn = (struct logical_op *) pc; |
| 616 | |
| 617 | /* If REG_R0 is 0, skip and evaluate to 0 */ |
| 618 | if ((reg[REG_R0].type == REG_S64 && reg[REG_R0].v == 0) |
| 619 | || (reg[REG_R0].type == REG_DOUBLE && reg[REG_R0].d == 0.0)) { |
| 620 | dbg_printf("Jumping to bytecode offset %u\n", |
| 621 | (unsigned int) insn->skip_offset); |
| 622 | next_pc = start_pc + insn->skip_offset; |
| 623 | } else { |
| 624 | next_pc += sizeof(struct logical_op); |
| 625 | } |
| 626 | break; |
| 627 | } |
| 628 | case FILTER_OP_OR: |
| 629 | { |
| 630 | struct logical_op *insn = (struct logical_op *) pc; |
| 631 | |
| 632 | /* If REG_R0 is nonzero, skip and evaluate to 1 */ |
| 633 | |
| 634 | if ((reg[REG_R0].type == REG_S64 && reg[REG_R0].v != 0) |
| 635 | || (reg[REG_R0].type == REG_DOUBLE && reg[REG_R0].d != 0.0)) { |
| 636 | reg[REG_R0].v = 1; |
| 637 | dbg_printf("Jumping to bytecode offset %u\n", |
| 638 | (unsigned int) insn->skip_offset); |
| 639 | next_pc = start_pc + insn->skip_offset; |
| 640 | } else { |
| 641 | next_pc += sizeof(struct logical_op); |
| 642 | } |
| 643 | break; |
| 644 | } |
| 645 | |
| 646 | /* load */ |
| 647 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 648 | { |
| 649 | struct load_op *insn = (struct load_op *) pc; |
| 650 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 651 | |
| 652 | dbg_printf("load field ref offset %u type string\n", |
| 653 | ref->offset); |
| 654 | reg[insn->reg].str = |
| 655 | *(const char * const *) &filter_stack_data[ref->offset]; |
| 656 | reg[insn->reg].type = REG_STRING; |
| 657 | reg[insn->reg].seq_len = UINT_MAX; |
| 658 | reg[insn->reg].literal = 0; |
| 659 | dbg_printf("ref load string %s\n", reg[insn->reg].str); |
| 660 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 661 | break; |
| 662 | } |
| 663 | |
| 664 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 665 | { |
| 666 | struct load_op *insn = (struct load_op *) pc; |
| 667 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 668 | |
| 669 | dbg_printf("load field ref offset %u type sequence\n", |
| 670 | ref->offset); |
| 671 | reg[insn->reg].seq_len = |
| 672 | *(unsigned long *) &filter_stack_data[ref->offset]; |
| 673 | reg[insn->reg].str = |
| 674 | *(const char **) (&filter_stack_data[ref->offset |
| 675 | + sizeof(unsigned long)]); |
| 676 | reg[insn->reg].type = REG_STRING; |
| 677 | reg[insn->reg].literal = 0; |
| 678 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 679 | break; |
| 680 | } |
| 681 | |
| 682 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 683 | { |
| 684 | struct load_op *insn = (struct load_op *) pc; |
| 685 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 686 | |
| 687 | dbg_printf("load field ref offset %u type s64\n", |
| 688 | ref->offset); |
| 689 | memcpy(®[insn->reg].v, &filter_stack_data[ref->offset], |
| 690 | sizeof(struct literal_numeric)); |
| 691 | reg[insn->reg].type = REG_S64; |
| 692 | reg[insn->reg].literal = 0; |
| 693 | dbg_printf("ref load s64 %" PRIi64 "\n", reg[insn->reg].v); |
| 694 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 695 | break; |
| 696 | } |
| 697 | |
| 698 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 699 | { |
| 700 | struct load_op *insn = (struct load_op *) pc; |
| 701 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 702 | |
| 703 | dbg_printf("load field ref offset %u type double\n", |
| 704 | ref->offset); |
| 705 | memcpy(®[insn->reg].d, &filter_stack_data[ref->offset], |
| 706 | sizeof(struct literal_double)); |
| 707 | reg[insn->reg].type = REG_DOUBLE; |
| 708 | reg[insn->reg].literal = 0; |
| 709 | dbg_printf("ref load double %g\n", reg[insn->reg].d); |
| 710 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 711 | break; |
| 712 | } |
| 713 | |
| 714 | case FILTER_OP_LOAD_STRING: |
| 715 | { |
| 716 | struct load_op *insn = (struct load_op *) pc; |
| 717 | |
| 718 | dbg_printf("load string %s\n", insn->data); |
| 719 | reg[insn->reg].str = insn->data; |
| 720 | reg[insn->reg].type = REG_STRING; |
| 721 | reg[insn->reg].seq_len = UINT_MAX; |
| 722 | reg[insn->reg].literal = 1; |
| 723 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 724 | break; |
| 725 | } |
| 726 | |
| 727 | case FILTER_OP_LOAD_S64: |
| 728 | { |
| 729 | struct load_op *insn = (struct load_op *) pc; |
| 730 | |
| 731 | memcpy(®[insn->reg].v, insn->data, |
| 732 | sizeof(struct literal_numeric)); |
| 733 | dbg_printf("load s64 %" PRIi64 "\n", reg[insn->reg].v); |
| 734 | reg[insn->reg].type = REG_S64; |
| 735 | next_pc += sizeof(struct load_op) |
| 736 | + sizeof(struct literal_numeric); |
| 737 | break; |
| 738 | } |
| 739 | |
| 740 | case FILTER_OP_LOAD_DOUBLE: |
| 741 | { |
| 742 | struct load_op *insn = (struct load_op *) pc; |
| 743 | |
| 744 | memcpy(®[insn->reg].d, insn->data, |
| 745 | sizeof(struct literal_double)); |
| 746 | dbg_printf("load s64 %g\n", reg[insn->reg].d); |
| 747 | reg[insn->reg].type = REG_DOUBLE; |
| 748 | next_pc += sizeof(struct load_op) |
| 749 | + sizeof(struct literal_double); |
| 750 | break; |
| 751 | } |
| 752 | } |
| 753 | } |
| 754 | end: |
| 755 | /* return 0 (discard) on error */ |
| 756 | if (ret) |
| 757 | return 0; |
| 758 | return retval; |
| 759 | } |
| 760 | |
| 761 | static |
| 762 | int bin_op_compare_check(struct vreg reg[NR_REG], const char *str) |
| 763 | { |
| 764 | switch (reg[REG_R0].type) { |
| 765 | default: |
| 766 | goto error_unknown; |
| 767 | |
| 768 | case REG_STRING: |
| 769 | switch (reg[REG_R1].type) { |
| 770 | default: |
| 771 | goto error_unknown; |
| 772 | |
| 773 | case REG_STRING: |
| 774 | break; |
| 775 | case REG_S64: |
| 776 | case REG_DOUBLE: |
| 777 | goto error_mismatch; |
| 778 | } |
| 779 | break; |
| 780 | case REG_S64: |
| 781 | case REG_DOUBLE: |
| 782 | switch (reg[REG_R1].type) { |
| 783 | default: |
| 784 | goto error_unknown; |
| 785 | |
| 786 | case REG_STRING: |
| 787 | goto error_mismatch; |
| 788 | |
| 789 | case REG_S64: |
| 790 | case REG_DOUBLE: |
| 791 | break; |
| 792 | } |
| 793 | break; |
| 794 | } |
| 795 | return 0; |
| 796 | |
| 797 | error_unknown: |
| 798 | |
| 799 | return -EINVAL; |
| 800 | error_mismatch: |
| 801 | ERR("type mismatch for '%s' binary operator\n", str); |
| 802 | return -EINVAL; |
| 803 | } |
| 804 | |
| 805 | static |
| 806 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) |
| 807 | { |
| 808 | void *pc, *next_pc, *start_pc; |
| 809 | int ret = -EINVAL; |
| 810 | struct vreg reg[NR_REG]; |
| 811 | int i; |
| 812 | |
| 813 | for (i = 0; i < NR_REG; i++) { |
| 814 | reg[i].type = REG_TYPE_UNKNOWN; |
| 815 | reg[i].literal = 0; |
| 816 | } |
| 817 | |
| 818 | start_pc = &bytecode->data[0]; |
| 819 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
| 820 | pc = next_pc) { |
| 821 | if (unlikely(pc >= start_pc + bytecode->len)) { |
| 822 | ERR("filter bytecode overflow\n"); |
| 823 | ret = -EINVAL; |
| 824 | goto end; |
| 825 | } |
| 826 | dbg_printf("Validating op %s (%u)\n", |
| 827 | print_op((unsigned int) *(filter_opcode_t *) pc), |
| 828 | (unsigned int) *(filter_opcode_t *) pc); |
| 829 | switch (*(filter_opcode_t *) pc) { |
| 830 | case FILTER_OP_UNKNOWN: |
| 831 | default: |
| 832 | ERR("unknown bytecode op %u\n", |
| 833 | (unsigned int) *(filter_opcode_t *) pc); |
| 834 | ret = -EINVAL; |
| 835 | goto end; |
| 836 | |
| 837 | case FILTER_OP_RETURN: |
| 838 | ret = 0; |
| 839 | goto end; |
| 840 | |
| 841 | /* binary */ |
| 842 | case FILTER_OP_MUL: |
| 843 | case FILTER_OP_DIV: |
| 844 | case FILTER_OP_MOD: |
| 845 | case FILTER_OP_PLUS: |
| 846 | case FILTER_OP_MINUS: |
| 847 | case FILTER_OP_RSHIFT: |
| 848 | case FILTER_OP_LSHIFT: |
| 849 | case FILTER_OP_BIN_AND: |
| 850 | case FILTER_OP_BIN_OR: |
| 851 | case FILTER_OP_BIN_XOR: |
| 852 | ERR("unsupported bytecode op %u\n", |
| 853 | (unsigned int) *(filter_opcode_t *) pc); |
| 854 | ret = -EINVAL; |
| 855 | goto end; |
| 856 | |
| 857 | case FILTER_OP_EQ: |
| 858 | { |
| 859 | ret = bin_op_compare_check(reg, "=="); |
| 860 | if (ret) |
| 861 | goto end; |
| 862 | reg[REG_R0].type = REG_S64; |
| 863 | next_pc += sizeof(struct binary_op); |
| 864 | break; |
| 865 | } |
| 866 | case FILTER_OP_NE: |
| 867 | { |
| 868 | ret = bin_op_compare_check(reg, "!="); |
| 869 | if (ret) |
| 870 | goto end; |
| 871 | reg[REG_R0].type = REG_S64; |
| 872 | next_pc += sizeof(struct binary_op); |
| 873 | break; |
| 874 | } |
| 875 | case FILTER_OP_GT: |
| 876 | { |
| 877 | ret = bin_op_compare_check(reg, ">"); |
| 878 | if (ret) |
| 879 | goto end; |
| 880 | reg[REG_R0].type = REG_S64; |
| 881 | next_pc += sizeof(struct binary_op); |
| 882 | break; |
| 883 | } |
| 884 | case FILTER_OP_LT: |
| 885 | { |
| 886 | ret = bin_op_compare_check(reg, "<"); |
| 887 | if (ret) |
| 888 | goto end; |
| 889 | reg[REG_R0].type = REG_S64; |
| 890 | next_pc += sizeof(struct binary_op); |
| 891 | break; |
| 892 | } |
| 893 | case FILTER_OP_GE: |
| 894 | { |
| 895 | ret = bin_op_compare_check(reg, ">="); |
| 896 | if (ret) |
| 897 | goto end; |
| 898 | reg[REG_R0].type = REG_S64; |
| 899 | next_pc += sizeof(struct binary_op); |
| 900 | break; |
| 901 | } |
| 902 | case FILTER_OP_LE: |
| 903 | { |
| 904 | ret = bin_op_compare_check(reg, "<="); |
| 905 | if (ret) |
| 906 | goto end; |
| 907 | reg[REG_R0].type = REG_S64; |
| 908 | next_pc += sizeof(struct binary_op); |
| 909 | break; |
| 910 | } |
| 911 | |
| 912 | /* unary */ |
| 913 | case FILTER_OP_UNARY_PLUS: |
| 914 | case FILTER_OP_UNARY_MINUS: |
| 915 | case FILTER_OP_UNARY_NOT: |
| 916 | { |
| 917 | struct unary_op *insn = (struct unary_op *) pc; |
| 918 | |
| 919 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 920 | ERR("invalid register %u\n", |
| 921 | (unsigned int) insn->reg); |
| 922 | ret = -EINVAL; |
| 923 | goto end; |
| 924 | } |
| 925 | switch (reg[insn->reg].type) { |
| 926 | default: |
| 927 | ERR("unknown register type\n"); |
| 928 | ret = -EINVAL; |
| 929 | goto end; |
| 930 | |
| 931 | case REG_STRING: |
| 932 | ERR("Unary op can only be applied to numeric or floating point registers\n"); |
| 933 | ret = -EINVAL; |
| 934 | goto end; |
| 935 | case REG_S64: |
| 936 | break; |
| 937 | case REG_DOUBLE: |
| 938 | break; |
| 939 | } |
| 940 | next_pc += sizeof(struct unary_op); |
| 941 | break; |
| 942 | } |
| 943 | /* logical */ |
| 944 | case FILTER_OP_AND: |
| 945 | case FILTER_OP_OR: |
| 946 | { |
| 947 | struct logical_op *insn = (struct logical_op *) pc; |
| 948 | |
| 949 | if (unlikely(reg[REG_R0].type == REG_TYPE_UNKNOWN |
| 950 | || reg[REG_R0].type == REG_TYPE_UNKNOWN |
| 951 | || reg[REG_R0].type == REG_STRING |
| 952 | || reg[REG_R1].type == REG_STRING)) { |
| 953 | ERR("Logical comparator can only be applied to numeric and floating point registers\n"); |
| 954 | ret = -EINVAL; |
| 955 | goto end; |
| 956 | } |
| 957 | |
| 958 | dbg_printf("Validate jumping to bytecode offset %u\n", |
| 959 | (unsigned int) insn->skip_offset); |
| 960 | if (unlikely(start_pc + insn->skip_offset <= pc)) { |
| 961 | ERR("Loops are not allowed in bytecode\n"); |
| 962 | ret = -EINVAL; |
| 963 | goto end; |
| 964 | } |
| 965 | next_pc += sizeof(struct logical_op); |
| 966 | break; |
| 967 | } |
| 968 | |
| 969 | /* load */ |
| 970 | case FILTER_OP_LOAD_FIELD_REF: |
| 971 | { |
| 972 | ERR("Unknown field ref type\n"); |
| 973 | ret = -EINVAL; |
| 974 | goto end; |
| 975 | } |
| 976 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 977 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 978 | { |
| 979 | struct load_op *insn = (struct load_op *) pc; |
| 980 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 981 | |
| 982 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 983 | ERR("invalid register %u\n", |
| 984 | (unsigned int) insn->reg); |
| 985 | ret = -EINVAL; |
| 986 | goto end; |
| 987 | } |
| 988 | dbg_printf("Validate load field ref offset %u type string\n", |
| 989 | ref->offset); |
| 990 | reg[insn->reg].type = REG_STRING; |
| 991 | reg[insn->reg].literal = 0; |
| 992 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 993 | break; |
| 994 | } |
| 995 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 996 | { |
| 997 | struct load_op *insn = (struct load_op *) pc; |
| 998 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 999 | |
| 1000 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 1001 | ERR("invalid register %u\n", |
| 1002 | (unsigned int) insn->reg); |
| 1003 | ret = -EINVAL; |
| 1004 | goto end; |
| 1005 | } |
| 1006 | dbg_printf("Validate load field ref offset %u type s64\n", |
| 1007 | ref->offset); |
| 1008 | reg[insn->reg].type = REG_S64; |
| 1009 | reg[insn->reg].literal = 0; |
| 1010 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1011 | break; |
| 1012 | } |
| 1013 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 1014 | { |
| 1015 | struct load_op *insn = (struct load_op *) pc; |
| 1016 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 1017 | |
| 1018 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 1019 | ERR("invalid register %u\n", |
| 1020 | (unsigned int) insn->reg); |
| 1021 | ret = -EINVAL; |
| 1022 | goto end; |
| 1023 | } |
| 1024 | dbg_printf("Validate load field ref offset %u type double\n", |
| 1025 | ref->offset); |
| 1026 | reg[insn->reg].type = REG_DOUBLE; |
| 1027 | reg[insn->reg].literal = 0; |
| 1028 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 1029 | break; |
| 1030 | } |
| 1031 | |
| 1032 | case FILTER_OP_LOAD_STRING: |
| 1033 | { |
| 1034 | struct load_op *insn = (struct load_op *) pc; |
| 1035 | |
| 1036 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 1037 | ERR("invalid register %u\n", |
| 1038 | (unsigned int) insn->reg); |
| 1039 | ret = -EINVAL; |
| 1040 | goto end; |
| 1041 | } |
| 1042 | reg[insn->reg].type = REG_STRING; |
| 1043 | reg[insn->reg].literal = 1; |
| 1044 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 1045 | break; |
| 1046 | } |
| 1047 | |
| 1048 | case FILTER_OP_LOAD_S64: |
| 1049 | { |
| 1050 | struct load_op *insn = (struct load_op *) pc; |
| 1051 | |
| 1052 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 1053 | ERR("invalid register %u\n", |
| 1054 | (unsigned int) insn->reg); |
| 1055 | ret = -EINVAL; |
| 1056 | goto end; |
| 1057 | } |
| 1058 | reg[insn->reg].type = REG_S64; |
| 1059 | next_pc += sizeof(struct load_op) |
| 1060 | + sizeof(struct literal_numeric); |
| 1061 | break; |
| 1062 | } |
| 1063 | |
| 1064 | case FILTER_OP_LOAD_DOUBLE: |
| 1065 | { |
| 1066 | struct load_op *insn = (struct load_op *) pc; |
| 1067 | |
| 1068 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 1069 | ERR("invalid register %u\n", |
| 1070 | (unsigned int) insn->reg); |
| 1071 | ret = -EINVAL; |
| 1072 | goto end; |
| 1073 | } |
| 1074 | reg[insn->reg].type = REG_DOUBLE; |
| 1075 | next_pc += sizeof(struct load_op) |
| 1076 | + sizeof(struct literal_double); |
| 1077 | break; |
| 1078 | } |
| 1079 | } |
| 1080 | } |
| 1081 | end: |
| 1082 | return ret; |
| 1083 | } |
| 1084 | |
| 1085 | static |
| 1086 | int apply_field_reloc(struct ltt_event *event, |
| 1087 | struct bytecode_runtime *runtime, |
| 1088 | uint32_t runtime_len, |
| 1089 | uint32_t reloc_offset, |
| 1090 | const char *field_name) |
| 1091 | { |
| 1092 | const struct lttng_event_desc *desc; |
| 1093 | const struct lttng_event_field *fields, *field = NULL; |
| 1094 | unsigned int nr_fields, i; |
| 1095 | struct field_ref *field_ref; |
| 1096 | struct load_op *op; |
| 1097 | uint32_t field_offset = 0; |
| 1098 | |
| 1099 | dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name); |
| 1100 | |
| 1101 | /* Ensure that the reloc is within the code */ |
| 1102 | if (runtime_len - reloc_offset < sizeof(uint16_t)) |
| 1103 | return -EINVAL; |
| 1104 | |
| 1105 | /* Lookup event by name */ |
| 1106 | desc = event->desc; |
| 1107 | if (!desc) |
| 1108 | return -EINVAL; |
| 1109 | fields = desc->fields; |
| 1110 | if (!fields) |
| 1111 | return -EINVAL; |
| 1112 | nr_fields = desc->nr_fields; |
| 1113 | for (i = 0; i < nr_fields; i++) { |
| 1114 | if (!strcmp(fields[i].name, field_name)) { |
| 1115 | field = &fields[i]; |
| 1116 | break; |
| 1117 | } |
| 1118 | /* compute field offset */ |
| 1119 | switch (fields[i].type.atype) { |
| 1120 | case atype_integer: |
| 1121 | case atype_enum: |
| 1122 | field_offset += sizeof(int64_t); |
| 1123 | break; |
| 1124 | case atype_array: |
| 1125 | case atype_sequence: |
| 1126 | field_offset += sizeof(unsigned long); |
| 1127 | field_offset += sizeof(void *); |
| 1128 | break; |
| 1129 | case atype_string: |
| 1130 | field_offset += sizeof(void *); |
| 1131 | break; |
| 1132 | case atype_float: |
| 1133 | field_offset += sizeof(double); |
| 1134 | break; |
| 1135 | default: |
| 1136 | return -EINVAL; |
| 1137 | } |
| 1138 | } |
| 1139 | if (!field) |
| 1140 | return -EINVAL; |
| 1141 | |
| 1142 | /* Check if field offset is too large for 16-bit offset */ |
| 1143 | if (field_offset > FILTER_BYTECODE_MAX_LEN) |
| 1144 | return -EINVAL; |
| 1145 | |
| 1146 | /* set type */ |
| 1147 | op = (struct load_op *) &runtime->data[reloc_offset]; |
| 1148 | field_ref = (struct field_ref *) op->data; |
| 1149 | switch (field->type.atype) { |
| 1150 | case atype_integer: |
| 1151 | case atype_enum: |
| 1152 | op->op = FILTER_OP_LOAD_FIELD_REF_S64; |
| 1153 | break; |
| 1154 | case atype_array: |
| 1155 | case atype_sequence: |
| 1156 | op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE; |
| 1157 | break; |
| 1158 | case atype_string: |
| 1159 | op->op = FILTER_OP_LOAD_FIELD_REF_STRING; |
| 1160 | break; |
| 1161 | case atype_float: |
| 1162 | op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE; |
| 1163 | break; |
| 1164 | default: |
| 1165 | return -EINVAL; |
| 1166 | } |
| 1167 | /* set offset */ |
| 1168 | field_ref->offset = (uint16_t) field_offset; |
| 1169 | return 0; |
| 1170 | } |
| 1171 | |
| 1172 | /* |
| 1173 | * Take a bytecode with reloc table and link it to an event to create a |
| 1174 | * bytecode runtime. |
| 1175 | */ |
| 1176 | static |
| 1177 | int _lttng_filter_event_link_bytecode(struct ltt_event *event, |
| 1178 | struct lttng_ust_filter_bytecode *filter_bytecode) |
| 1179 | { |
| 1180 | int ret, offset, next_offset; |
| 1181 | struct bytecode_runtime *runtime = NULL; |
| 1182 | size_t runtime_alloc_len; |
| 1183 | |
| 1184 | if (!filter_bytecode) |
| 1185 | return 0; |
| 1186 | /* Even is not connected to any description */ |
| 1187 | if (!event->desc) |
| 1188 | return 0; |
| 1189 | /* Bytecode already linked */ |
| 1190 | if (event->filter || event->filter_data) |
| 1191 | return 0; |
| 1192 | |
| 1193 | dbg_printf("Linking\n"); |
| 1194 | |
| 1195 | /* We don't need the reloc table in the runtime */ |
| 1196 | runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset; |
| 1197 | runtime = zmalloc(runtime_alloc_len); |
| 1198 | if (!runtime) { |
| 1199 | ret = -ENOMEM; |
| 1200 | goto link_error; |
| 1201 | } |
| 1202 | runtime->len = filter_bytecode->reloc_offset; |
| 1203 | /* copy original bytecode */ |
| 1204 | memcpy(runtime->data, filter_bytecode->data, runtime->len); |
| 1205 | /* |
| 1206 | * apply relocs. Those are a uint16_t (offset in bytecode) |
| 1207 | * followed by a string (field name). |
| 1208 | */ |
| 1209 | for (offset = filter_bytecode->reloc_offset; |
| 1210 | offset < filter_bytecode->len; |
| 1211 | offset = next_offset) { |
| 1212 | uint16_t reloc_offset = |
| 1213 | *(uint16_t *) &filter_bytecode->data[offset]; |
| 1214 | const char *field_name = |
| 1215 | (const char *) &filter_bytecode->data[offset + sizeof(uint16_t)]; |
| 1216 | |
| 1217 | ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name); |
| 1218 | if (ret) { |
| 1219 | goto link_error; |
| 1220 | } |
| 1221 | next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1; |
| 1222 | } |
| 1223 | /* Validate bytecode */ |
| 1224 | ret = lttng_filter_validate_bytecode(runtime); |
| 1225 | if (ret) { |
| 1226 | goto link_error; |
| 1227 | } |
| 1228 | event->filter_data = runtime; |
| 1229 | event->filter = lttng_filter_interpret_bytecode; |
| 1230 | return 0; |
| 1231 | |
| 1232 | link_error: |
| 1233 | event->filter = lttng_filter_false; |
| 1234 | free(runtime); |
| 1235 | return ret; |
| 1236 | } |
| 1237 | |
| 1238 | void lttng_filter_event_link_bytecode(struct ltt_event *event, |
| 1239 | struct lttng_ust_filter_bytecode *filter_bytecode) |
| 1240 | { |
| 1241 | int ret; |
| 1242 | |
| 1243 | ret = _lttng_filter_event_link_bytecode(event, filter_bytecode); |
| 1244 | if (ret) { |
| 1245 | fprintf(stderr, "[lttng filter] error linking event bytecode\n"); |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | /* |
| 1250 | * Link bytecode to all events for a wildcard. Skips events that already |
| 1251 | * have a bytecode linked. |
| 1252 | * We do not set each event's filter_bytecode field, because they do not |
| 1253 | * own the filter_bytecode: the wildcard owns it. |
| 1254 | */ |
| 1255 | void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard) |
| 1256 | { |
| 1257 | struct ltt_event *event; |
| 1258 | int ret; |
| 1259 | |
| 1260 | if (!wildcard->filter_bytecode) |
| 1261 | return; |
| 1262 | |
| 1263 | cds_list_for_each_entry(event, &wildcard->events, wildcard_list) { |
| 1264 | if (event->filter) |
| 1265 | continue; |
| 1266 | ret = _lttng_filter_event_link_bytecode(event, |
| 1267 | wildcard->filter_bytecode); |
| 1268 | if (ret) { |
| 1269 | fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n"); |
| 1270 | } |
| 1271 | |
| 1272 | } |
| 1273 | return; |
| 1274 | } |
| 1275 | |
| 1276 | /* |
| 1277 | * Need to attach filter to an event before starting tracing for the |
| 1278 | * session. We own the filter_bytecode if we return success. |
| 1279 | */ |
| 1280 | int lttng_filter_event_attach_bytecode(struct ltt_event *event, |
| 1281 | struct lttng_ust_filter_bytecode *filter_bytecode) |
| 1282 | { |
| 1283 | if (event->chan->session->been_active) |
| 1284 | return -EPERM; |
| 1285 | if (event->filter_bytecode) |
| 1286 | return -EEXIST; |
| 1287 | event->filter_bytecode = filter_bytecode; |
| 1288 | return 0; |
| 1289 | } |
| 1290 | |
| 1291 | /* |
| 1292 | * Need to attach filter to a wildcard before starting tracing for the |
| 1293 | * session. We own the filter_bytecode if we return success. |
| 1294 | */ |
| 1295 | int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard, |
| 1296 | struct lttng_ust_filter_bytecode *filter_bytecode) |
| 1297 | { |
| 1298 | if (wildcard->chan->session->been_active) |
| 1299 | return -EPERM; |
| 1300 | if (wildcard->filter_bytecode) |
| 1301 | return -EEXIST; |
| 1302 | wildcard->filter_bytecode = filter_bytecode; |
| 1303 | return 0; |
| 1304 | } |