Commit | Line | Data |
---|---|---|
97b58163 MD |
1 | /* |
2 | * lttng-filter-validator.c | |
3 | * | |
4 | * LTTng UST filter bytecode validator. | |
5 | * | |
7e50015d | 6 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
97b58163 | 7 | * |
7e50015d MD |
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: | |
97b58163 | 14 | * |
7e50015d MD |
15 | * The above copyright notice and this permission notice shall be included in |
16 | * all copies or substantial portions of the Software. | |
97b58163 | 17 | * |
7e50015d MD |
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. | |
97b58163 MD |
25 | */ |
26 | ||
bf956ec0 | 27 | #define _LGPL_SOURCE |
b4051ad8 | 28 | #include <stddef.h> |
bf956ec0 MD |
29 | #include <urcu-bp.h> |
30 | #include <time.h> | |
97b58163 MD |
31 | #include "lttng-filter.h" |
32 | ||
bf956ec0 MD |
33 | #include <urcu/rculfhash.h> |
34 | #include "lttng-hash-helper.h" | |
3151a51d | 35 | #include "string-utils.h" |
bf956ec0 | 36 | |
0305960f MD |
37 | /* |
38 | * Number of merge points for hash table size. Hash table initialized to | |
39 | * that size, and we do not resize, because we do not want to trigger | |
40 | * RCU worker thread execution: fall-back on linear traversal if number | |
41 | * of merge points exceeds this value. | |
42 | */ | |
43 | #define DEFAULT_NR_MERGE_POINTS 128 | |
44 | #define MIN_NR_BUCKETS 128 | |
45 | #define MAX_NR_BUCKETS 128 | |
46 | ||
bf956ec0 MD |
47 | /* merge point table node */ |
48 | struct lfht_mp_node { | |
49 | struct cds_lfht_node node; | |
50 | ||
51 | /* Context at merge point */ | |
0305960f | 52 | struct vstack stack; |
bf956ec0 MD |
53 | unsigned long target_pc; |
54 | }; | |
55 | ||
56 | static unsigned long lttng_hash_seed; | |
57 | static unsigned int lttng_hash_seed_ready; | |
58 | ||
59 | static | |
60 | int lttng_hash_match(struct cds_lfht_node *node, const void *key) | |
61 | { | |
62 | struct lfht_mp_node *mp_node = | |
63 | caa_container_of(node, struct lfht_mp_node, node); | |
64 | unsigned long key_pc = (unsigned long) key; | |
65 | ||
66 | if (mp_node->target_pc == key_pc) | |
67 | return 1; | |
68 | else | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static | |
71c1ceeb MD |
73 | int merge_points_compare(const struct vstack *stacka, |
74 | const struct vstack *stackb) | |
75 | { | |
76 | int i, len; | |
77 | ||
78 | if (stacka->top != stackb->top) | |
79 | return 1; | |
80 | len = stacka->top + 1; | |
81 | assert(len >= 0); | |
82 | for (i = 0; i < len; i++) { | |
53569322 MD |
83 | if (stacka->e[i].type != REG_UNKNOWN |
84 | && stackb->e[i].type != REG_UNKNOWN | |
85 | && stacka->e[i].type != stackb->e[i].type) | |
71c1ceeb MD |
86 | return 1; |
87 | } | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static | |
92 | int merge_point_add_check(struct cds_lfht *ht, unsigned long target_pc, | |
0305960f | 93 | const struct vstack *stack) |
bf956ec0 MD |
94 | { |
95 | struct lfht_mp_node *node; | |
22389ecb | 96 | unsigned long hash = lttng_hash_mix((const char *) target_pc, |
bf956ec0 MD |
97 | sizeof(target_pc), |
98 | lttng_hash_seed); | |
71c1ceeb | 99 | struct cds_lfht_node *ret; |
bf956ec0 MD |
100 | |
101 | dbg_printf("Filter: adding merge point at offset %lu, hash %lu\n", | |
102 | target_pc, hash); | |
103 | node = zmalloc(sizeof(struct lfht_mp_node)); | |
104 | if (!node) | |
105 | return -ENOMEM; | |
106 | node->target_pc = target_pc; | |
0305960f | 107 | memcpy(&node->stack, stack, sizeof(node->stack)); |
71c1ceeb | 108 | ret = cds_lfht_add_unique(ht, hash, lttng_hash_match, |
22389ecb | 109 | (const char *) target_pc, &node->node); |
71c1ceeb MD |
110 | if (ret != &node->node) { |
111 | struct lfht_mp_node *ret_mp = | |
112 | caa_container_of(ret, struct lfht_mp_node, node); | |
113 | ||
114 | /* Key already present */ | |
115 | dbg_printf("Filter: compare merge points for offset %lu, hash %lu\n", | |
116 | target_pc, hash); | |
117 | free(node); | |
118 | if (merge_points_compare(stack, &ret_mp->stack)) { | |
119 | ERR("Merge points differ for offset %lu\n", | |
120 | target_pc); | |
121 | return -EINVAL; | |
122 | } | |
123 | } | |
bf956ec0 MD |
124 | return 0; |
125 | } | |
126 | ||
127 | /* | |
0305960f | 128 | * Binary comparators use top of stack and top of stack -1. |
53569322 MD |
129 | * Return 0 if typing is known to match, 1 if typing is dynamic |
130 | * (unknown), negative error value on error. | |
bf956ec0 | 131 | */ |
97b58163 | 132 | static |
3151a51d PP |
133 | int bin_op_compare_check(struct vstack *stack, filter_opcode_t opcode, |
134 | const char *str) | |
97b58163 | 135 | { |
0305960f | 136 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) |
53569322 | 137 | goto error_empty; |
0305960f MD |
138 | |
139 | switch (vstack_ax(stack)->type) { | |
97b58163 | 140 | default: |
53569322 | 141 | goto error_type; |
97b58163 | 142 | |
53569322 MD |
143 | case REG_UNKNOWN: |
144 | goto unknown; | |
97b58163 | 145 | case REG_STRING: |
0305960f | 146 | switch (vstack_bx(stack)->type) { |
97b58163 | 147 | default: |
53569322 | 148 | goto error_type; |
97b58163 | 149 | |
53569322 MD |
150 | case REG_UNKNOWN: |
151 | goto unknown; | |
97b58163 MD |
152 | case REG_STRING: |
153 | break; | |
3151a51d PP |
154 | case REG_STAR_GLOB_STRING: |
155 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { | |
156 | goto error_mismatch; | |
157 | } | |
158 | break; | |
159 | case REG_S64: | |
160 | case REG_DOUBLE: | |
161 | goto error_mismatch; | |
162 | } | |
163 | break; | |
164 | case REG_STAR_GLOB_STRING: | |
165 | switch (vstack_bx(stack)->type) { | |
166 | default: | |
167 | goto error_type; | |
168 | ||
169 | case REG_UNKNOWN: | |
170 | goto unknown; | |
171 | case REG_STRING: | |
172 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { | |
173 | goto error_mismatch; | |
174 | } | |
175 | break; | |
176 | case REG_STAR_GLOB_STRING: | |
97b58163 MD |
177 | case REG_S64: |
178 | case REG_DOUBLE: | |
179 | goto error_mismatch; | |
180 | } | |
181 | break; | |
182 | case REG_S64: | |
183 | case REG_DOUBLE: | |
0305960f | 184 | switch (vstack_bx(stack)->type) { |
97b58163 | 185 | default: |
53569322 | 186 | goto error_type; |
97b58163 | 187 | |
53569322 MD |
188 | case REG_UNKNOWN: |
189 | goto unknown; | |
97b58163 | 190 | case REG_STRING: |
3151a51d | 191 | case REG_STAR_GLOB_STRING: |
97b58163 | 192 | goto error_mismatch; |
97b58163 MD |
193 | case REG_S64: |
194 | case REG_DOUBLE: | |
195 | break; | |
196 | } | |
197 | break; | |
198 | } | |
199 | return 0; | |
200 | ||
53569322 MD |
201 | unknown: |
202 | return 1; | |
0305960f | 203 | |
97b58163 MD |
204 | error_mismatch: |
205 | ERR("type mismatch for '%s' binary operator\n", str); | |
206 | return -EINVAL; | |
53569322 MD |
207 | |
208 | error_empty: | |
209 | ERR("empty stack for '%s' binary operator\n", str); | |
210 | return -EINVAL; | |
211 | ||
212 | error_type: | |
213 | ERR("unknown type for '%s' binary operator\n", str); | |
214 | return -EINVAL; | |
97b58163 MD |
215 | } |
216 | ||
47e5f13e MD |
217 | /* |
218 | * Binary bitwise operators use top of stack and top of stack -1. | |
219 | * Return 0 if typing is known to match, 1 if typing is dynamic | |
220 | * (unknown), negative error value on error. | |
221 | */ | |
222 | static | |
223 | int bin_op_bitwise_check(struct vstack *stack, filter_opcode_t opcode, | |
224 | const char *str) | |
225 | { | |
226 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) | |
227 | goto error_empty; | |
228 | ||
229 | switch (vstack_ax(stack)->type) { | |
230 | default: | |
231 | goto error_type; | |
232 | ||
233 | case REG_UNKNOWN: | |
234 | goto unknown; | |
235 | case REG_S64: | |
236 | switch (vstack_bx(stack)->type) { | |
237 | default: | |
238 | goto error_type; | |
239 | ||
240 | case REG_UNKNOWN: | |
241 | goto unknown; | |
242 | case REG_S64: | |
243 | break; | |
244 | } | |
245 | break; | |
246 | } | |
247 | return 0; | |
248 | ||
249 | unknown: | |
250 | return 1; | |
251 | ||
252 | error_empty: | |
253 | ERR("empty stack for '%s' binary operator\n", str); | |
254 | return -EINVAL; | |
255 | ||
256 | error_type: | |
257 | ERR("unknown type for '%s' binary operator\n", str); | |
258 | return -EINVAL; | |
259 | } | |
260 | ||
261 | static | |
262 | int validate_get_symbol(struct bytecode_runtime *bytecode, | |
263 | const struct get_symbol *sym) | |
264 | { | |
265 | const char *str, *str_limit; | |
266 | size_t len_limit; | |
267 | ||
268 | if (sym->offset >= bytecode->p.bc->bc.len - bytecode->p.bc->bc.reloc_offset) | |
269 | return -EINVAL; | |
270 | ||
271 | str = bytecode->p.bc->bc.data + bytecode->p.bc->bc.reloc_offset + sym->offset; | |
272 | str_limit = bytecode->p.bc->bc.data + bytecode->p.bc->bc.len; | |
273 | len_limit = str_limit - str; | |
274 | if (strnlen(str, len_limit) == len_limit) | |
275 | return -EINVAL; | |
276 | return 0; | |
277 | } | |
278 | ||
97b58163 MD |
279 | /* |
280 | * Validate bytecode range overflow within the validation pass. | |
281 | * Called for each instruction encountered. | |
282 | */ | |
283 | static | |
284 | int bytecode_validate_overflow(struct bytecode_runtime *bytecode, | |
22389ecb | 285 | char *start_pc, char *pc) |
97b58163 MD |
286 | { |
287 | int ret = 0; | |
288 | ||
289 | switch (*(filter_opcode_t *) pc) { | |
290 | case FILTER_OP_UNKNOWN: | |
291 | default: | |
292 | { | |
293 | ERR("unknown bytecode op %u\n", | |
294 | (unsigned int) *(filter_opcode_t *) pc); | |
295 | ret = -EINVAL; | |
296 | break; | |
297 | } | |
298 | ||
299 | case FILTER_OP_RETURN: | |
93c591bb | 300 | case FILTER_OP_RETURN_S64: |
97b58163 MD |
301 | { |
302 | if (unlikely(pc + sizeof(struct return_op) | |
303 | > start_pc + bytecode->len)) { | |
82513dbe | 304 | ret = -ERANGE; |
97b58163 MD |
305 | } |
306 | break; | |
307 | } | |
308 | ||
309 | /* binary */ | |
310 | case FILTER_OP_MUL: | |
311 | case FILTER_OP_DIV: | |
312 | case FILTER_OP_MOD: | |
313 | case FILTER_OP_PLUS: | |
314 | case FILTER_OP_MINUS: | |
97b58163 MD |
315 | { |
316 | ERR("unsupported bytecode op %u\n", | |
317 | (unsigned int) *(filter_opcode_t *) pc); | |
318 | ret = -EINVAL; | |
319 | break; | |
320 | } | |
321 | ||
322 | case FILTER_OP_EQ: | |
323 | case FILTER_OP_NE: | |
324 | case FILTER_OP_GT: | |
325 | case FILTER_OP_LT: | |
326 | case FILTER_OP_GE: | |
327 | case FILTER_OP_LE: | |
328 | case FILTER_OP_EQ_STRING: | |
329 | case FILTER_OP_NE_STRING: | |
330 | case FILTER_OP_GT_STRING: | |
331 | case FILTER_OP_LT_STRING: | |
332 | case FILTER_OP_GE_STRING: | |
333 | case FILTER_OP_LE_STRING: | |
3151a51d PP |
334 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
335 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
97b58163 MD |
336 | case FILTER_OP_EQ_S64: |
337 | case FILTER_OP_NE_S64: | |
338 | case FILTER_OP_GT_S64: | |
339 | case FILTER_OP_LT_S64: | |
340 | case FILTER_OP_GE_S64: | |
341 | case FILTER_OP_LE_S64: | |
342 | case FILTER_OP_EQ_DOUBLE: | |
343 | case FILTER_OP_NE_DOUBLE: | |
344 | case FILTER_OP_GT_DOUBLE: | |
345 | case FILTER_OP_LT_DOUBLE: | |
346 | case FILTER_OP_GE_DOUBLE: | |
347 | case FILTER_OP_LE_DOUBLE: | |
dbea82ec MD |
348 | case FILTER_OP_EQ_DOUBLE_S64: |
349 | case FILTER_OP_NE_DOUBLE_S64: | |
350 | case FILTER_OP_GT_DOUBLE_S64: | |
351 | case FILTER_OP_LT_DOUBLE_S64: | |
352 | case FILTER_OP_GE_DOUBLE_S64: | |
353 | case FILTER_OP_LE_DOUBLE_S64: | |
354 | case FILTER_OP_EQ_S64_DOUBLE: | |
355 | case FILTER_OP_NE_S64_DOUBLE: | |
356 | case FILTER_OP_GT_S64_DOUBLE: | |
357 | case FILTER_OP_LT_S64_DOUBLE: | |
358 | case FILTER_OP_GE_S64_DOUBLE: | |
359 | case FILTER_OP_LE_S64_DOUBLE: | |
0039e2d8 MD |
360 | case FILTER_OP_BIT_RSHIFT: |
361 | case FILTER_OP_BIT_LSHIFT: | |
47e5f13e MD |
362 | case FILTER_OP_BIT_AND: |
363 | case FILTER_OP_BIT_OR: | |
364 | case FILTER_OP_BIT_XOR: | |
97b58163 MD |
365 | { |
366 | if (unlikely(pc + sizeof(struct binary_op) | |
367 | > start_pc + bytecode->len)) { | |
82513dbe | 368 | ret = -ERANGE; |
97b58163 MD |
369 | } |
370 | break; | |
371 | } | |
372 | ||
373 | /* unary */ | |
374 | case FILTER_OP_UNARY_PLUS: | |
375 | case FILTER_OP_UNARY_MINUS: | |
376 | case FILTER_OP_UNARY_NOT: | |
377 | case FILTER_OP_UNARY_PLUS_S64: | |
378 | case FILTER_OP_UNARY_MINUS_S64: | |
379 | case FILTER_OP_UNARY_NOT_S64: | |
380 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
381 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
382 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
0039e2d8 | 383 | case FILTER_OP_UNARY_BIT_NOT: |
97b58163 MD |
384 | { |
385 | if (unlikely(pc + sizeof(struct unary_op) | |
386 | > start_pc + bytecode->len)) { | |
82513dbe | 387 | ret = -ERANGE; |
97b58163 MD |
388 | } |
389 | break; | |
390 | } | |
391 | ||
392 | /* logical */ | |
393 | case FILTER_OP_AND: | |
394 | case FILTER_OP_OR: | |
395 | { | |
396 | if (unlikely(pc + sizeof(struct logical_op) | |
397 | > start_pc + bytecode->len)) { | |
82513dbe | 398 | ret = -ERANGE; |
97b58163 MD |
399 | } |
400 | break; | |
401 | } | |
402 | ||
77aa5901 | 403 | /* load field ref */ |
97b58163 MD |
404 | case FILTER_OP_LOAD_FIELD_REF: |
405 | { | |
406 | ERR("Unknown field ref type\n"); | |
407 | ret = -EINVAL; | |
408 | break; | |
409 | } | |
47e5f13e | 410 | |
77aa5901 MD |
411 | /* get context ref */ |
412 | case FILTER_OP_GET_CONTEXT_REF: | |
97b58163 MD |
413 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
414 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
415 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
416 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
77aa5901 MD |
417 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
418 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
419 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
97b58163 MD |
420 | { |
421 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) | |
422 | > start_pc + bytecode->len)) { | |
82513dbe | 423 | ret = -ERANGE; |
97b58163 MD |
424 | } |
425 | break; | |
426 | } | |
427 | ||
77aa5901 | 428 | /* load from immediate operand */ |
97b58163 | 429 | case FILTER_OP_LOAD_STRING: |
3151a51d | 430 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
97b58163 MD |
431 | { |
432 | struct load_op *insn = (struct load_op *) pc; | |
433 | uint32_t str_len, maxlen; | |
434 | ||
435 | if (unlikely(pc + sizeof(struct load_op) | |
436 | > start_pc + bytecode->len)) { | |
82513dbe | 437 | ret = -ERANGE; |
97b58163 MD |
438 | break; |
439 | } | |
440 | ||
441 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); | |
442 | str_len = strnlen(insn->data, maxlen); | |
443 | if (unlikely(str_len >= maxlen)) { | |
444 | /* Final '\0' not found within range */ | |
82513dbe | 445 | ret = -ERANGE; |
97b58163 MD |
446 | } |
447 | break; | |
448 | } | |
449 | ||
450 | case FILTER_OP_LOAD_S64: | |
451 | { | |
452 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) | |
453 | > start_pc + bytecode->len)) { | |
82513dbe | 454 | ret = -ERANGE; |
97b58163 MD |
455 | } |
456 | break; | |
457 | } | |
458 | ||
459 | case FILTER_OP_LOAD_DOUBLE: | |
460 | { | |
461 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_double) | |
462 | > start_pc + bytecode->len)) { | |
82513dbe | 463 | ret = -ERANGE; |
97b58163 MD |
464 | } |
465 | break; | |
466 | } | |
467 | ||
468 | case FILTER_OP_CAST_TO_S64: | |
469 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
470 | case FILTER_OP_CAST_NOP: | |
471 | { | |
472 | if (unlikely(pc + sizeof(struct cast_op) | |
473 | > start_pc + bytecode->len)) { | |
82513dbe | 474 | ret = -ERANGE; |
97b58163 MD |
475 | } |
476 | break; | |
477 | } | |
77aa5901 | 478 | |
47e5f13e MD |
479 | /* |
480 | * Instructions for recursive traversal through composed types. | |
481 | */ | |
482 | case FILTER_OP_GET_CONTEXT_ROOT: | |
483 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
484 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
485 | case FILTER_OP_LOAD_FIELD: | |
486 | case FILTER_OP_LOAD_FIELD_S8: | |
487 | case FILTER_OP_LOAD_FIELD_S16: | |
488 | case FILTER_OP_LOAD_FIELD_S32: | |
489 | case FILTER_OP_LOAD_FIELD_S64: | |
490 | case FILTER_OP_LOAD_FIELD_U8: | |
491 | case FILTER_OP_LOAD_FIELD_U16: | |
492 | case FILTER_OP_LOAD_FIELD_U32: | |
493 | case FILTER_OP_LOAD_FIELD_U64: | |
494 | case FILTER_OP_LOAD_FIELD_STRING: | |
495 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
496 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
497 | if (unlikely(pc + sizeof(struct load_op) | |
498 | > start_pc + bytecode->len)) { | |
499 | ret = -ERANGE; | |
500 | } | |
501 | break; | |
502 | ||
503 | case FILTER_OP_GET_SYMBOL: | |
504 | { | |
505 | struct load_op *insn = (struct load_op *) pc; | |
506 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
507 | ||
508 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol) | |
509 | > start_pc + bytecode->len)) { | |
510 | ret = -ERANGE; | |
90732639 | 511 | break; |
47e5f13e MD |
512 | } |
513 | ret = validate_get_symbol(bytecode, sym); | |
514 | break; | |
515 | } | |
516 | ||
517 | case FILTER_OP_GET_SYMBOL_FIELD: | |
518 | ERR("Unexpected get symbol field"); | |
519 | ret = -EINVAL; | |
520 | break; | |
521 | ||
522 | case FILTER_OP_GET_INDEX_U16: | |
523 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16) | |
524 | > start_pc + bytecode->len)) { | |
525 | ret = -ERANGE; | |
526 | } | |
527 | break; | |
528 | ||
529 | case FILTER_OP_GET_INDEX_U64: | |
530 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64) | |
531 | > start_pc + bytecode->len)) { | |
532 | ret = -ERANGE; | |
533 | } | |
534 | break; | |
97b58163 MD |
535 | } |
536 | ||
537 | return ret; | |
538 | } | |
539 | ||
bf956ec0 MD |
540 | static |
541 | unsigned long delete_all_nodes(struct cds_lfht *ht) | |
97b58163 | 542 | { |
bf956ec0 MD |
543 | struct cds_lfht_iter iter; |
544 | struct lfht_mp_node *node; | |
545 | unsigned long nr_nodes = 0; | |
97b58163 | 546 | |
bf956ec0 MD |
547 | cds_lfht_for_each_entry(ht, &iter, node, node) { |
548 | int ret; | |
549 | ||
550 | ret = cds_lfht_del(ht, cds_lfht_iter_get_node(&iter)); | |
551 | assert(!ret); | |
552 | /* note: this hash table is never used concurrently */ | |
553 | free(node); | |
554 | nr_nodes++; | |
97b58163 | 555 | } |
bf956ec0 MD |
556 | return nr_nodes; |
557 | } | |
97b58163 | 558 | |
bf956ec0 MD |
559 | /* |
560 | * Return value: | |
53569322 | 561 | * >=0: success |
bf956ec0 MD |
562 | * <0: error |
563 | */ | |
564 | static | |
565 | int validate_instruction_context(struct bytecode_runtime *bytecode, | |
0305960f | 566 | struct vstack *stack, |
22389ecb MD |
567 | char *start_pc, |
568 | char *pc) | |
bf956ec0 MD |
569 | { |
570 | int ret = 0; | |
3151a51d | 571 | const filter_opcode_t opcode = *(filter_opcode_t *) pc; |
bf956ec0 | 572 | |
3151a51d | 573 | switch (opcode) { |
bf956ec0 MD |
574 | case FILTER_OP_UNKNOWN: |
575 | default: | |
576 | { | |
577 | ERR("unknown bytecode op %u\n", | |
97b58163 | 578 | (unsigned int) *(filter_opcode_t *) pc); |
bf956ec0 MD |
579 | ret = -EINVAL; |
580 | goto end; | |
581 | } | |
582 | ||
583 | case FILTER_OP_RETURN: | |
93c591bb | 584 | case FILTER_OP_RETURN_S64: |
bf956ec0 MD |
585 | { |
586 | goto end; | |
587 | } | |
588 | ||
589 | /* binary */ | |
590 | case FILTER_OP_MUL: | |
591 | case FILTER_OP_DIV: | |
592 | case FILTER_OP_MOD: | |
593 | case FILTER_OP_PLUS: | |
594 | case FILTER_OP_MINUS: | |
bf956ec0 MD |
595 | { |
596 | ERR("unsupported bytecode op %u\n", | |
3151a51d | 597 | (unsigned int) opcode); |
bf956ec0 MD |
598 | ret = -EINVAL; |
599 | goto end; | |
600 | } | |
97b58163 | 601 | |
bf956ec0 MD |
602 | case FILTER_OP_EQ: |
603 | { | |
3151a51d | 604 | ret = bin_op_compare_check(stack, opcode, "=="); |
53569322 | 605 | if (ret < 0) |
bf956ec0 MD |
606 | goto end; |
607 | break; | |
608 | } | |
609 | case FILTER_OP_NE: | |
610 | { | |
3151a51d | 611 | ret = bin_op_compare_check(stack, opcode, "!="); |
53569322 | 612 | if (ret < 0) |
bf956ec0 MD |
613 | goto end; |
614 | break; | |
615 | } | |
616 | case FILTER_OP_GT: | |
617 | { | |
3151a51d | 618 | ret = bin_op_compare_check(stack, opcode, ">"); |
53569322 | 619 | if (ret < 0) |
bf956ec0 MD |
620 | goto end; |
621 | break; | |
622 | } | |
623 | case FILTER_OP_LT: | |
624 | { | |
3151a51d | 625 | ret = bin_op_compare_check(stack, opcode, "<"); |
53569322 | 626 | if (ret < 0) |
bf956ec0 MD |
627 | goto end; |
628 | break; | |
629 | } | |
630 | case FILTER_OP_GE: | |
631 | { | |
3151a51d | 632 | ret = bin_op_compare_check(stack, opcode, ">="); |
53569322 | 633 | if (ret < 0) |
bf956ec0 MD |
634 | goto end; |
635 | break; | |
636 | } | |
637 | case FILTER_OP_LE: | |
638 | { | |
3151a51d | 639 | ret = bin_op_compare_check(stack, opcode, "<="); |
53569322 | 640 | if (ret < 0) |
97b58163 | 641 | goto end; |
bf956ec0 MD |
642 | break; |
643 | } | |
97b58163 | 644 | |
bf956ec0 MD |
645 | case FILTER_OP_EQ_STRING: |
646 | case FILTER_OP_NE_STRING: | |
647 | case FILTER_OP_GT_STRING: | |
648 | case FILTER_OP_LT_STRING: | |
649 | case FILTER_OP_GE_STRING: | |
650 | case FILTER_OP_LE_STRING: | |
651 | { | |
0305960f MD |
652 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
653 | ERR("Empty stack\n"); | |
654 | ret = -EINVAL; | |
655 | goto end; | |
656 | } | |
657 | if (vstack_ax(stack)->type != REG_STRING | |
658 | || vstack_bx(stack)->type != REG_STRING) { | |
bf956ec0 | 659 | ERR("Unexpected register type for string comparator\n"); |
97b58163 MD |
660 | ret = -EINVAL; |
661 | goto end; | |
97b58163 | 662 | } |
bf956ec0 MD |
663 | break; |
664 | } | |
97b58163 | 665 | |
3151a51d PP |
666 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
667 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
668 | { | |
669 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
670 | ERR("Empty stack\n"); | |
671 | ret = -EINVAL; | |
672 | goto end; | |
673 | } | |
674 | if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING | |
675 | && vstack_bx(stack)->type != REG_STAR_GLOB_STRING) { | |
676 | ERR("Unexpected register type for globbing pattern comparator\n"); | |
677 | ret = -EINVAL; | |
678 | goto end; | |
679 | } | |
680 | break; | |
681 | } | |
682 | ||
bf956ec0 MD |
683 | case FILTER_OP_EQ_S64: |
684 | case FILTER_OP_NE_S64: | |
685 | case FILTER_OP_GT_S64: | |
686 | case FILTER_OP_LT_S64: | |
687 | case FILTER_OP_GE_S64: | |
688 | case FILTER_OP_LE_S64: | |
689 | { | |
0305960f MD |
690 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
691 | ERR("Empty stack\n"); | |
692 | ret = -EINVAL; | |
693 | goto end; | |
694 | } | |
695 | if (vstack_ax(stack)->type != REG_S64 | |
696 | || vstack_bx(stack)->type != REG_S64) { | |
bf956ec0 MD |
697 | ERR("Unexpected register type for s64 comparator\n"); |
698 | ret = -EINVAL; | |
699 | goto end; | |
97b58163 | 700 | } |
bf956ec0 MD |
701 | break; |
702 | } | |
97b58163 | 703 | |
bf956ec0 MD |
704 | case FILTER_OP_EQ_DOUBLE: |
705 | case FILTER_OP_NE_DOUBLE: | |
706 | case FILTER_OP_GT_DOUBLE: | |
707 | case FILTER_OP_LT_DOUBLE: | |
708 | case FILTER_OP_GE_DOUBLE: | |
709 | case FILTER_OP_LE_DOUBLE: | |
710 | { | |
0305960f MD |
711 | if (!vstack_ax(stack) || !vstack_bx(stack)) { |
712 | ERR("Empty stack\n"); | |
713 | ret = -EINVAL; | |
714 | goto end; | |
715 | } | |
dbea82ec MD |
716 | if (vstack_ax(stack)->type != REG_DOUBLE && vstack_bx(stack)->type != REG_DOUBLE) { |
717 | ERR("Double operator should have two double registers\n"); | |
bf956ec0 MD |
718 | ret = -EINVAL; |
719 | goto end; | |
97b58163 | 720 | } |
dbea82ec MD |
721 | break; |
722 | } | |
723 | ||
724 | case FILTER_OP_EQ_DOUBLE_S64: | |
725 | case FILTER_OP_NE_DOUBLE_S64: | |
726 | case FILTER_OP_GT_DOUBLE_S64: | |
727 | case FILTER_OP_LT_DOUBLE_S64: | |
728 | case FILTER_OP_GE_DOUBLE_S64: | |
729 | case FILTER_OP_LE_DOUBLE_S64: | |
730 | { | |
731 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
732 | ERR("Empty stack\n"); | |
733 | ret = -EINVAL; | |
734 | goto end; | |
735 | } | |
736 | if (vstack_ax(stack)->type != REG_S64 && vstack_bx(stack)->type != REG_DOUBLE) { | |
737 | ERR("Double-S64 operator has unexpected register types\n"); | |
738 | ret = -EINVAL; | |
739 | goto end; | |
740 | } | |
741 | break; | |
742 | } | |
743 | ||
744 | case FILTER_OP_EQ_S64_DOUBLE: | |
745 | case FILTER_OP_NE_S64_DOUBLE: | |
746 | case FILTER_OP_GT_S64_DOUBLE: | |
747 | case FILTER_OP_LT_S64_DOUBLE: | |
748 | case FILTER_OP_GE_S64_DOUBLE: | |
749 | case FILTER_OP_LE_S64_DOUBLE: | |
750 | { | |
751 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
752 | ERR("Empty stack\n"); | |
753 | ret = -EINVAL; | |
754 | goto end; | |
755 | } | |
756 | if (vstack_ax(stack)->type != REG_DOUBLE && vstack_bx(stack)->type != REG_S64) { | |
757 | ERR("S64-Double operator has unexpected register types\n"); | |
bf956ec0 MD |
758 | ret = -EINVAL; |
759 | goto end; | |
97b58163 | 760 | } |
bf956ec0 MD |
761 | break; |
762 | } | |
97b58163 | 763 | |
0039e2d8 MD |
764 | case FILTER_OP_BIT_RSHIFT: |
765 | ret = bin_op_bitwise_check(stack, opcode, ">>"); | |
766 | if (ret < 0) | |
767 | goto end; | |
768 | break; | |
769 | case FILTER_OP_BIT_LSHIFT: | |
770 | ret = bin_op_bitwise_check(stack, opcode, "<<"); | |
771 | if (ret < 0) | |
772 | goto end; | |
773 | break; | |
47e5f13e MD |
774 | case FILTER_OP_BIT_AND: |
775 | ret = bin_op_bitwise_check(stack, opcode, "&"); | |
776 | if (ret < 0) | |
777 | goto end; | |
778 | break; | |
779 | case FILTER_OP_BIT_OR: | |
780 | ret = bin_op_bitwise_check(stack, opcode, "|"); | |
781 | if (ret < 0) | |
782 | goto end; | |
783 | break; | |
784 | case FILTER_OP_BIT_XOR: | |
785 | ret = bin_op_bitwise_check(stack, opcode, "^"); | |
786 | if (ret < 0) | |
787 | goto end; | |
788 | break; | |
789 | ||
bf956ec0 MD |
790 | /* unary */ |
791 | case FILTER_OP_UNARY_PLUS: | |
792 | case FILTER_OP_UNARY_MINUS: | |
793 | case FILTER_OP_UNARY_NOT: | |
794 | { | |
0305960f MD |
795 | if (!vstack_ax(stack)) { |
796 | ERR("Empty stack\n"); | |
bf956ec0 MD |
797 | ret = -EINVAL; |
798 | goto end; | |
799 | } | |
0305960f | 800 | switch (vstack_ax(stack)->type) { |
bf956ec0 MD |
801 | default: |
802 | ERR("unknown register type\n"); | |
803 | ret = -EINVAL; | |
804 | goto end; | |
97b58163 | 805 | |
bf956ec0 | 806 | case REG_STRING: |
3151a51d | 807 | case REG_STAR_GLOB_STRING: |
bf956ec0 MD |
808 | ERR("Unary op can only be applied to numeric or floating point registers\n"); |
809 | ret = -EINVAL; | |
810 | goto end; | |
811 | case REG_S64: | |
812 | break; | |
813 | case REG_DOUBLE: | |
97b58163 | 814 | break; |
53569322 MD |
815 | case REG_UNKNOWN: |
816 | break; | |
97b58163 | 817 | } |
bf956ec0 MD |
818 | break; |
819 | } | |
0039e2d8 MD |
820 | case FILTER_OP_UNARY_BIT_NOT: |
821 | { | |
822 | if (!vstack_ax(stack)) { | |
823 | ERR("Empty stack\n"); | |
824 | ret = -EINVAL; | |
825 | goto end; | |
826 | } | |
827 | switch (vstack_ax(stack)->type) { | |
828 | default: | |
829 | ERR("unknown register type\n"); | |
830 | ret = -EINVAL; | |
831 | goto end; | |
832 | ||
833 | case REG_STRING: | |
834 | case REG_STAR_GLOB_STRING: | |
835 | case REG_DOUBLE: | |
836 | ERR("Unary bitwise op can only be applied to numeric registers\n"); | |
837 | ret = -EINVAL; | |
838 | goto end; | |
839 | case REG_S64: | |
840 | break; | |
841 | case REG_UNKNOWN: | |
842 | break; | |
843 | } | |
844 | break; | |
845 | } | |
97b58163 | 846 | |
bf956ec0 MD |
847 | case FILTER_OP_UNARY_PLUS_S64: |
848 | case FILTER_OP_UNARY_MINUS_S64: | |
849 | case FILTER_OP_UNARY_NOT_S64: | |
850 | { | |
0305960f MD |
851 | if (!vstack_ax(stack)) { |
852 | ERR("Empty stack\n"); | |
bf956ec0 MD |
853 | ret = -EINVAL; |
854 | goto end; | |
855 | } | |
0305960f | 856 | if (vstack_ax(stack)->type != REG_S64) { |
bf956ec0 MD |
857 | ERR("Invalid register type\n"); |
858 | ret = -EINVAL; | |
859 | goto end; | |
97b58163 | 860 | } |
bf956ec0 MD |
861 | break; |
862 | } | |
97b58163 | 863 | |
bf956ec0 MD |
864 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
865 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
866 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
867 | { | |
0305960f MD |
868 | if (!vstack_ax(stack)) { |
869 | ERR("Empty stack\n"); | |
bf956ec0 MD |
870 | ret = -EINVAL; |
871 | goto end; | |
97b58163 | 872 | } |
0305960f | 873 | if (vstack_ax(stack)->type != REG_DOUBLE) { |
bf956ec0 MD |
874 | ERR("Invalid register type\n"); |
875 | ret = -EINVAL; | |
876 | goto end; | |
877 | } | |
878 | break; | |
879 | } | |
97b58163 | 880 | |
bf956ec0 MD |
881 | /* logical */ |
882 | case FILTER_OP_AND: | |
883 | case FILTER_OP_OR: | |
884 | { | |
885 | struct logical_op *insn = (struct logical_op *) pc; | |
97b58163 | 886 | |
0305960f MD |
887 | if (!vstack_ax(stack)) { |
888 | ERR("Empty stack\n"); | |
889 | ret = -EINVAL; | |
890 | goto end; | |
891 | } | |
53569322 MD |
892 | if (vstack_ax(stack)->type != REG_S64 |
893 | && vstack_ax(stack)->type != REG_UNKNOWN) { | |
894 | ERR("Logical comparator expects S64 or dynamic register\n"); | |
bf956ec0 MD |
895 | ret = -EINVAL; |
896 | goto end; | |
97b58163 MD |
897 | } |
898 | ||
bf956ec0 MD |
899 | dbg_printf("Validate jumping to bytecode offset %u\n", |
900 | (unsigned int) insn->skip_offset); | |
901 | if (unlikely(start_pc + insn->skip_offset <= pc)) { | |
902 | ERR("Loops are not allowed in bytecode\n"); | |
97b58163 MD |
903 | ret = -EINVAL; |
904 | goto end; | |
905 | } | |
bf956ec0 MD |
906 | break; |
907 | } | |
97b58163 | 908 | |
77aa5901 | 909 | /* load field ref */ |
bf956ec0 MD |
910 | case FILTER_OP_LOAD_FIELD_REF: |
911 | { | |
912 | ERR("Unknown field ref type\n"); | |
913 | ret = -EINVAL; | |
914 | goto end; | |
915 | } | |
916 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
917 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
918 | { | |
919 | struct load_op *insn = (struct load_op *) pc; | |
920 | struct field_ref *ref = (struct field_ref *) insn->data; | |
921 | ||
bf956ec0 MD |
922 | dbg_printf("Validate load field ref offset %u type string\n", |
923 | ref->offset); | |
924 | break; | |
925 | } | |
926 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
927 | { | |
928 | struct load_op *insn = (struct load_op *) pc; | |
929 | struct field_ref *ref = (struct field_ref *) insn->data; | |
97b58163 | 930 | |
bf956ec0 MD |
931 | dbg_printf("Validate load field ref offset %u type s64\n", |
932 | ref->offset); | |
933 | break; | |
934 | } | |
935 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
936 | { | |
937 | struct load_op *insn = (struct load_op *) pc; | |
938 | struct field_ref *ref = (struct field_ref *) insn->data; | |
97b58163 | 939 | |
bf956ec0 MD |
940 | dbg_printf("Validate load field ref offset %u type double\n", |
941 | ref->offset); | |
942 | break; | |
943 | } | |
97b58163 | 944 | |
77aa5901 | 945 | /* load from immediate operand */ |
bf956ec0 | 946 | case FILTER_OP_LOAD_STRING: |
3151a51d | 947 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
bf956ec0 | 948 | { |
bf956ec0 MD |
949 | break; |
950 | } | |
97b58163 | 951 | |
bf956ec0 MD |
952 | case FILTER_OP_LOAD_S64: |
953 | { | |
bf956ec0 MD |
954 | break; |
955 | } | |
97b58163 | 956 | |
bf956ec0 MD |
957 | case FILTER_OP_LOAD_DOUBLE: |
958 | { | |
bf956ec0 MD |
959 | break; |
960 | } | |
97b58163 | 961 | |
bf956ec0 MD |
962 | case FILTER_OP_CAST_TO_S64: |
963 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
964 | { | |
965 | struct cast_op *insn = (struct cast_op *) pc; | |
97b58163 | 966 | |
0305960f MD |
967 | if (!vstack_ax(stack)) { |
968 | ERR("Empty stack\n"); | |
bf956ec0 MD |
969 | ret = -EINVAL; |
970 | goto end; | |
971 | } | |
0305960f | 972 | switch (vstack_ax(stack)->type) { |
bf956ec0 MD |
973 | default: |
974 | ERR("unknown register type\n"); | |
975 | ret = -EINVAL; | |
976 | goto end; | |
97b58163 | 977 | |
bf956ec0 | 978 | case REG_STRING: |
3151a51d | 979 | case REG_STAR_GLOB_STRING: |
bf956ec0 MD |
980 | ERR("Cast op can only be applied to numeric or floating point registers\n"); |
981 | ret = -EINVAL; | |
982 | goto end; | |
983 | case REG_S64: | |
984 | break; | |
985 | case REG_DOUBLE: | |
986 | break; | |
53569322 MD |
987 | case REG_UNKNOWN: |
988 | break; | |
bf956ec0 MD |
989 | } |
990 | if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) { | |
0305960f | 991 | if (vstack_ax(stack)->type != REG_DOUBLE) { |
bf956ec0 | 992 | ERR("Cast expects double\n"); |
97b58163 MD |
993 | ret = -EINVAL; |
994 | goto end; | |
97b58163 | 995 | } |
97b58163 | 996 | } |
bf956ec0 MD |
997 | break; |
998 | } | |
999 | case FILTER_OP_CAST_NOP: | |
1000 | { | |
1001 | break; | |
1002 | } | |
1003 | ||
77aa5901 MD |
1004 | /* get context ref */ |
1005 | case FILTER_OP_GET_CONTEXT_REF: | |
1006 | { | |
53569322 MD |
1007 | struct load_op *insn = (struct load_op *) pc; |
1008 | struct field_ref *ref = (struct field_ref *) insn->data; | |
1009 | ||
1010 | dbg_printf("Validate get context ref offset %u type dynamic\n", | |
1011 | ref->offset); | |
1012 | break; | |
77aa5901 MD |
1013 | } |
1014 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
1015 | { | |
1016 | struct load_op *insn = (struct load_op *) pc; | |
1017 | struct field_ref *ref = (struct field_ref *) insn->data; | |
1018 | ||
1019 | dbg_printf("Validate get context ref offset %u type string\n", | |
1020 | ref->offset); | |
1021 | break; | |
1022 | } | |
1023 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
1024 | { | |
1025 | struct load_op *insn = (struct load_op *) pc; | |
1026 | struct field_ref *ref = (struct field_ref *) insn->data; | |
1027 | ||
1028 | dbg_printf("Validate get context ref offset %u type s64\n", | |
1029 | ref->offset); | |
1030 | break; | |
1031 | } | |
1032 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
1033 | { | |
1034 | struct load_op *insn = (struct load_op *) pc; | |
1035 | struct field_ref *ref = (struct field_ref *) insn->data; | |
1036 | ||
1037 | dbg_printf("Validate get context ref offset %u type double\n", | |
1038 | ref->offset); | |
1039 | break; | |
1040 | } | |
1041 | ||
47e5f13e MD |
1042 | /* |
1043 | * Instructions for recursive traversal through composed types. | |
1044 | */ | |
1045 | case FILTER_OP_GET_CONTEXT_ROOT: | |
1046 | { | |
1047 | dbg_printf("Validate get context root\n"); | |
1048 | break; | |
1049 | } | |
1050 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
1051 | { | |
1052 | dbg_printf("Validate get app context root\n"); | |
1053 | break; | |
1054 | } | |
1055 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
1056 | { | |
1057 | dbg_printf("Validate get payload root\n"); | |
1058 | break; | |
1059 | } | |
1060 | case FILTER_OP_LOAD_FIELD: | |
1061 | { | |
1062 | /* | |
1063 | * We tolerate that field type is unknown at validation, | |
1064 | * because we are performing the load specialization in | |
1065 | * a phase after validation. | |
1066 | */ | |
1067 | dbg_printf("Validate load field\n"); | |
1068 | break; | |
1069 | } | |
1070 | case FILTER_OP_LOAD_FIELD_S8: | |
1071 | { | |
1072 | dbg_printf("Validate load field s8\n"); | |
1073 | break; | |
1074 | } | |
1075 | case FILTER_OP_LOAD_FIELD_S16: | |
1076 | { | |
1077 | dbg_printf("Validate load field s16\n"); | |
1078 | break; | |
1079 | } | |
1080 | case FILTER_OP_LOAD_FIELD_S32: | |
1081 | { | |
1082 | dbg_printf("Validate load field s32\n"); | |
1083 | break; | |
1084 | } | |
1085 | case FILTER_OP_LOAD_FIELD_S64: | |
1086 | { | |
1087 | dbg_printf("Validate load field s64\n"); | |
1088 | break; | |
1089 | } | |
1090 | case FILTER_OP_LOAD_FIELD_U8: | |
1091 | { | |
1092 | dbg_printf("Validate load field u8\n"); | |
1093 | break; | |
1094 | } | |
1095 | case FILTER_OP_LOAD_FIELD_U16: | |
1096 | { | |
1097 | dbg_printf("Validate load field u16\n"); | |
1098 | break; | |
1099 | } | |
1100 | case FILTER_OP_LOAD_FIELD_U32: | |
1101 | { | |
1102 | dbg_printf("Validate load field u32\n"); | |
1103 | break; | |
1104 | } | |
1105 | case FILTER_OP_LOAD_FIELD_U64: | |
1106 | { | |
1107 | dbg_printf("Validate load field u64\n"); | |
1108 | break; | |
1109 | } | |
1110 | case FILTER_OP_LOAD_FIELD_STRING: | |
1111 | { | |
1112 | dbg_printf("Validate load field string\n"); | |
1113 | break; | |
1114 | } | |
1115 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
1116 | { | |
1117 | dbg_printf("Validate load field sequence\n"); | |
1118 | break; | |
1119 | } | |
1120 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
1121 | { | |
1122 | dbg_printf("Validate load field double\n"); | |
1123 | break; | |
1124 | } | |
1125 | ||
1126 | case FILTER_OP_GET_SYMBOL: | |
1127 | { | |
1128 | struct load_op *insn = (struct load_op *) pc; | |
1129 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1130 | ||
1131 | dbg_printf("Validate get symbol offset %u\n", sym->offset); | |
1132 | break; | |
1133 | } | |
1134 | ||
1135 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1136 | { | |
1137 | struct load_op *insn = (struct load_op *) pc; | |
1138 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1139 | ||
1140 | dbg_printf("Validate get symbol field offset %u\n", sym->offset); | |
1141 | break; | |
1142 | } | |
1143 | ||
1144 | case FILTER_OP_GET_INDEX_U16: | |
1145 | { | |
1146 | struct load_op *insn = (struct load_op *) pc; | |
1147 | struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data; | |
1148 | ||
1149 | dbg_printf("Validate get index u16 index %u\n", get_index->index); | |
1150 | break; | |
1151 | } | |
1152 | ||
1153 | case FILTER_OP_GET_INDEX_U64: | |
1154 | { | |
1155 | struct load_op *insn = (struct load_op *) pc; | |
1156 | struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data; | |
1157 | ||
1158 | dbg_printf("Validate get index u64 index %" PRIu64 "\n", get_index->index); | |
1159 | break; | |
1160 | } | |
bf956ec0 MD |
1161 | } |
1162 | end: | |
1163 | return ret; | |
1164 | } | |
1165 | ||
1166 | /* | |
1167 | * Return value: | |
1168 | * 0: success | |
1169 | * <0: error | |
1170 | */ | |
1171 | static | |
1172 | int validate_instruction_all_contexts(struct bytecode_runtime *bytecode, | |
1173 | struct cds_lfht *merge_points, | |
0305960f | 1174 | struct vstack *stack, |
22389ecb MD |
1175 | char *start_pc, |
1176 | char *pc) | |
bf956ec0 MD |
1177 | { |
1178 | int ret; | |
1179 | unsigned long target_pc = pc - start_pc; | |
1180 | struct cds_lfht_iter iter; | |
1181 | struct cds_lfht_node *node; | |
71c1ceeb | 1182 | struct lfht_mp_node *mp_node; |
bf956ec0 MD |
1183 | unsigned long hash; |
1184 | ||
1185 | /* Validate the context resulting from the previous instruction */ | |
0305960f | 1186 | ret = validate_instruction_context(bytecode, stack, start_pc, pc); |
53569322 | 1187 | if (ret < 0) |
bf956ec0 MD |
1188 | return ret; |
1189 | ||
1190 | /* Validate merge points */ | |
22389ecb | 1191 | hash = lttng_hash_mix((const char *) target_pc, sizeof(target_pc), |
bf956ec0 | 1192 | lttng_hash_seed); |
71c1ceeb | 1193 | cds_lfht_lookup(merge_points, hash, lttng_hash_match, |
22389ecb | 1194 | (const char *) target_pc, &iter); |
71c1ceeb MD |
1195 | node = cds_lfht_iter_get_node(&iter); |
1196 | if (node) { | |
1197 | mp_node = caa_container_of(node, struct lfht_mp_node, node); | |
3151a51d | 1198 | |
bf956ec0 MD |
1199 | dbg_printf("Filter: validate merge point at offset %lu\n", |
1200 | target_pc); | |
71c1ceeb MD |
1201 | if (merge_points_compare(stack, &mp_node->stack)) { |
1202 | ERR("Merge points differ for offset %lu\n", | |
1203 | target_pc); | |
1204 | return -EINVAL; | |
1205 | } | |
bf956ec0 | 1206 | /* Once validated, we can remove the merge point */ |
71c1ceeb | 1207 | dbg_printf("Filter: remove merge point at offset %lu\n", |
bf956ec0 MD |
1208 | target_pc); |
1209 | ret = cds_lfht_del(merge_points, node); | |
1210 | assert(!ret); | |
1211 | } | |
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Return value: | |
1217 | * >0: going to next insn. | |
1218 | * 0: success, stop iteration. | |
1219 | * <0: error | |
1220 | */ | |
1221 | static | |
1222 | int exec_insn(struct bytecode_runtime *bytecode, | |
1223 | struct cds_lfht *merge_points, | |
0305960f | 1224 | struct vstack *stack, |
22389ecb MD |
1225 | char **_next_pc, |
1226 | char *pc) | |
bf956ec0 MD |
1227 | { |
1228 | int ret = 1; | |
22389ecb | 1229 | char *next_pc = *_next_pc; |
bf956ec0 MD |
1230 | |
1231 | switch (*(filter_opcode_t *) pc) { | |
1232 | case FILTER_OP_UNKNOWN: | |
1233 | default: | |
1234 | { | |
1235 | ERR("unknown bytecode op %u\n", | |
1236 | (unsigned int) *(filter_opcode_t *) pc); | |
1237 | ret = -EINVAL; | |
1238 | goto end; | |
1239 | } | |
1240 | ||
1241 | case FILTER_OP_RETURN: | |
1242 | { | |
71c1ceeb MD |
1243 | if (!vstack_ax(stack)) { |
1244 | ERR("Empty stack\n"); | |
1245 | ret = -EINVAL; | |
1246 | goto end; | |
1247 | } | |
47e5f13e MD |
1248 | switch (vstack_ax(stack)->type) { |
1249 | case REG_S64: | |
1250 | case REG_UNKNOWN: | |
1251 | break; | |
1252 | default: | |
1253 | ERR("Unexpected register type %d at end of bytecode\n", | |
1254 | (int) vstack_ax(stack)->type); | |
1255 | ret = -EINVAL; | |
1256 | goto end; | |
1257 | } | |
1258 | ||
bf956ec0 MD |
1259 | ret = 0; |
1260 | goto end; | |
1261 | } | |
93c591bb MD |
1262 | case FILTER_OP_RETURN_S64: |
1263 | { | |
1264 | if (!vstack_ax(stack)) { | |
1265 | ERR("Empty stack\n"); | |
1266 | ret = -EINVAL; | |
1267 | goto end; | |
1268 | } | |
1269 | switch (vstack_ax(stack)->type) { | |
1270 | case REG_S64: | |
1271 | break; | |
1272 | default: | |
1273 | case REG_UNKNOWN: | |
1274 | ERR("Unexpected register type %d at end of bytecode\n", | |
1275 | (int) vstack_ax(stack)->type); | |
1276 | ret = -EINVAL; | |
1277 | goto end; | |
1278 | } | |
1279 | ||
1280 | ret = 0; | |
1281 | goto end; | |
1282 | } | |
bf956ec0 MD |
1283 | |
1284 | /* binary */ | |
1285 | case FILTER_OP_MUL: | |
1286 | case FILTER_OP_DIV: | |
1287 | case FILTER_OP_MOD: | |
1288 | case FILTER_OP_PLUS: | |
1289 | case FILTER_OP_MINUS: | |
bf956ec0 MD |
1290 | { |
1291 | ERR("unsupported bytecode op %u\n", | |
1292 | (unsigned int) *(filter_opcode_t *) pc); | |
1293 | ret = -EINVAL; | |
1294 | goto end; | |
1295 | } | |
1296 | ||
1297 | case FILTER_OP_EQ: | |
1298 | case FILTER_OP_NE: | |
1299 | case FILTER_OP_GT: | |
1300 | case FILTER_OP_LT: | |
1301 | case FILTER_OP_GE: | |
1302 | case FILTER_OP_LE: | |
1303 | case FILTER_OP_EQ_STRING: | |
1304 | case FILTER_OP_NE_STRING: | |
1305 | case FILTER_OP_GT_STRING: | |
1306 | case FILTER_OP_LT_STRING: | |
1307 | case FILTER_OP_GE_STRING: | |
1308 | case FILTER_OP_LE_STRING: | |
3151a51d PP |
1309 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
1310 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
bf956ec0 MD |
1311 | case FILTER_OP_EQ_S64: |
1312 | case FILTER_OP_NE_S64: | |
1313 | case FILTER_OP_GT_S64: | |
1314 | case FILTER_OP_LT_S64: | |
1315 | case FILTER_OP_GE_S64: | |
1316 | case FILTER_OP_LE_S64: | |
bf956ec0 MD |
1317 | case FILTER_OP_EQ_DOUBLE: |
1318 | case FILTER_OP_NE_DOUBLE: | |
1319 | case FILTER_OP_GT_DOUBLE: | |
1320 | case FILTER_OP_LT_DOUBLE: | |
1321 | case FILTER_OP_GE_DOUBLE: | |
1322 | case FILTER_OP_LE_DOUBLE: | |
dbea82ec MD |
1323 | case FILTER_OP_EQ_DOUBLE_S64: |
1324 | case FILTER_OP_NE_DOUBLE_S64: | |
1325 | case FILTER_OP_GT_DOUBLE_S64: | |
1326 | case FILTER_OP_LT_DOUBLE_S64: | |
1327 | case FILTER_OP_GE_DOUBLE_S64: | |
1328 | case FILTER_OP_LE_DOUBLE_S64: | |
1329 | case FILTER_OP_EQ_S64_DOUBLE: | |
1330 | case FILTER_OP_NE_S64_DOUBLE: | |
1331 | case FILTER_OP_GT_S64_DOUBLE: | |
1332 | case FILTER_OP_LT_S64_DOUBLE: | |
1333 | case FILTER_OP_GE_S64_DOUBLE: | |
1334 | case FILTER_OP_LE_S64_DOUBLE: | |
0039e2d8 MD |
1335 | case FILTER_OP_BIT_RSHIFT: |
1336 | case FILTER_OP_BIT_LSHIFT: | |
47e5f13e MD |
1337 | case FILTER_OP_BIT_AND: |
1338 | case FILTER_OP_BIT_OR: | |
1339 | case FILTER_OP_BIT_XOR: | |
bf956ec0 | 1340 | { |
0305960f MD |
1341 | /* Pop 2, push 1 */ |
1342 | if (vstack_pop(stack)) { | |
1343 | ret = -EINVAL; | |
1344 | goto end; | |
1345 | } | |
1346 | if (!vstack_ax(stack)) { | |
1347 | ERR("Empty stack\n"); | |
1348 | ret = -EINVAL; | |
1349 | goto end; | |
1350 | } | |
47e5f13e MD |
1351 | switch (vstack_ax(stack)->type) { |
1352 | case REG_S64: | |
1353 | case REG_DOUBLE: | |
1354 | case REG_STRING: | |
1355 | case REG_STAR_GLOB_STRING: | |
1356 | case REG_UNKNOWN: | |
1357 | break; | |
1358 | default: | |
1359 | ERR("Unexpected register type %d for operation\n", | |
1360 | (int) vstack_ax(stack)->type); | |
1361 | ret = -EINVAL; | |
1362 | goto end; | |
1363 | } | |
1364 | ||
0305960f | 1365 | vstack_ax(stack)->type = REG_S64; |
bf956ec0 MD |
1366 | next_pc += sizeof(struct binary_op); |
1367 | break; | |
1368 | } | |
1369 | ||
1370 | /* unary */ | |
1371 | case FILTER_OP_UNARY_PLUS: | |
1372 | case FILTER_OP_UNARY_MINUS: | |
53569322 MD |
1373 | { |
1374 | /* Pop 1, push 1 */ | |
1375 | if (!vstack_ax(stack)) { | |
1376 | ERR("Empty stack\n"); | |
1377 | ret = -EINVAL; | |
1378 | goto end; | |
1379 | } | |
47e5f13e MD |
1380 | switch (vstack_ax(stack)->type) { |
1381 | case REG_UNKNOWN: | |
1382 | case REG_DOUBLE: | |
1383 | case REG_S64: | |
1384 | break; | |
1385 | default: | |
1386 | ERR("Unexpected register type %d for operation\n", | |
1387 | (int) vstack_ax(stack)->type); | |
1388 | ret = -EINVAL; | |
1389 | goto end; | |
1390 | } | |
53569322 MD |
1391 | vstack_ax(stack)->type = REG_UNKNOWN; |
1392 | next_pc += sizeof(struct unary_op); | |
1393 | break; | |
1394 | } | |
1395 | ||
bf956ec0 MD |
1396 | case FILTER_OP_UNARY_PLUS_S64: |
1397 | case FILTER_OP_UNARY_MINUS_S64: | |
1398 | case FILTER_OP_UNARY_NOT_S64: | |
47e5f13e MD |
1399 | { |
1400 | /* Pop 1, push 1 */ | |
1401 | if (!vstack_ax(stack)) { | |
1402 | ERR("Empty stack\n"); | |
1403 | ret = -EINVAL; | |
1404 | goto end; | |
1405 | } | |
1406 | switch (vstack_ax(stack)->type) { | |
1407 | case REG_S64: | |
1408 | break; | |
1409 | default: | |
1410 | ERR("Unexpected register type %d for operation\n", | |
1411 | (int) vstack_ax(stack)->type); | |
1412 | ret = -EINVAL; | |
1413 | goto end; | |
1414 | } | |
1415 | ||
1416 | vstack_ax(stack)->type = REG_S64; | |
1417 | next_pc += sizeof(struct unary_op); | |
1418 | break; | |
1419 | } | |
1420 | ||
1421 | case FILTER_OP_UNARY_NOT: | |
1422 | { | |
1423 | /* Pop 1, push 1 */ | |
1424 | if (!vstack_ax(stack)) { | |
1425 | ERR("Empty stack\n"); | |
1426 | ret = -EINVAL; | |
1427 | goto end; | |
1428 | } | |
1429 | switch (vstack_ax(stack)->type) { | |
1430 | case REG_UNKNOWN: | |
1431 | case REG_DOUBLE: | |
1432 | case REG_S64: | |
1433 | break; | |
1434 | default: | |
1435 | ERR("Unexpected register type %d for operation\n", | |
1436 | (int) vstack_ax(stack)->type); | |
1437 | ret = -EINVAL; | |
1438 | goto end; | |
1439 | } | |
1440 | ||
1441 | vstack_ax(stack)->type = REG_S64; | |
1442 | next_pc += sizeof(struct unary_op); | |
1443 | break; | |
1444 | } | |
1445 | ||
0039e2d8 MD |
1446 | case FILTER_OP_UNARY_BIT_NOT: |
1447 | { | |
1448 | /* Pop 1, push 1 */ | |
1449 | if (!vstack_ax(stack)) { | |
1450 | ERR("Empty stack\n"); | |
1451 | ret = -EINVAL; | |
1452 | goto end; | |
1453 | } | |
1454 | switch (vstack_ax(stack)->type) { | |
1455 | case REG_UNKNOWN: | |
1456 | case REG_S64: | |
1457 | break; | |
1458 | case REG_DOUBLE: | |
1459 | default: | |
1460 | ERR("Unexpected register type %d for operation\n", | |
1461 | (int) vstack_ax(stack)->type); | |
1462 | ret = -EINVAL; | |
1463 | goto end; | |
1464 | } | |
1465 | ||
1466 | vstack_ax(stack)->type = REG_S64; | |
1467 | next_pc += sizeof(struct unary_op); | |
1468 | break; | |
1469 | } | |
1470 | ||
53569322 | 1471 | case FILTER_OP_UNARY_NOT_DOUBLE: |
bf956ec0 | 1472 | { |
0305960f MD |
1473 | /* Pop 1, push 1 */ |
1474 | if (!vstack_ax(stack)) { | |
1475 | ERR("Empty stack\n"); | |
1476 | ret = -EINVAL; | |
1477 | goto end; | |
1478 | } | |
47e5f13e MD |
1479 | switch (vstack_ax(stack)->type) { |
1480 | case REG_DOUBLE: | |
1481 | break; | |
1482 | default: | |
1483 | ERR("Incorrect register type %d for operation\n", | |
1484 | (int) vstack_ax(stack)->type); | |
1485 | ret = -EINVAL; | |
1486 | goto end; | |
1487 | } | |
1488 | ||
0305960f | 1489 | vstack_ax(stack)->type = REG_S64; |
bf956ec0 MD |
1490 | next_pc += sizeof(struct unary_op); |
1491 | break; | |
1492 | } | |
1493 | ||
1494 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
1495 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
bf956ec0 | 1496 | { |
0305960f MD |
1497 | /* Pop 1, push 1 */ |
1498 | if (!vstack_ax(stack)) { | |
1499 | ERR("Empty stack\n"); | |
1500 | ret = -EINVAL; | |
1501 | goto end; | |
1502 | } | |
47e5f13e MD |
1503 | switch (vstack_ax(stack)->type) { |
1504 | case REG_DOUBLE: | |
1505 | break; | |
1506 | default: | |
1507 | ERR("Incorrect register type %d for operation\n", | |
1508 | (int) vstack_ax(stack)->type); | |
1509 | ret = -EINVAL; | |
1510 | goto end; | |
1511 | } | |
1512 | ||
0305960f | 1513 | vstack_ax(stack)->type = REG_DOUBLE; |
bf956ec0 MD |
1514 | next_pc += sizeof(struct unary_op); |
1515 | break; | |
1516 | } | |
1517 | ||
1518 | /* logical */ | |
1519 | case FILTER_OP_AND: | |
1520 | case FILTER_OP_OR: | |
1521 | { | |
1522 | struct logical_op *insn = (struct logical_op *) pc; | |
1523 | int merge_ret; | |
1524 | ||
1525 | /* Add merge point to table */ | |
71c1ceeb MD |
1526 | merge_ret = merge_point_add_check(merge_points, |
1527 | insn->skip_offset, stack); | |
bf956ec0 MD |
1528 | if (merge_ret) { |
1529 | ret = merge_ret; | |
1530 | goto end; | |
97b58163 | 1531 | } |
47e5f13e MD |
1532 | |
1533 | if (!vstack_ax(stack)) { | |
1534 | ERR("Empty stack\n"); | |
1535 | ret = -EINVAL; | |
1536 | goto end; | |
1537 | } | |
1538 | /* There is always a cast-to-s64 operation before a or/and op. */ | |
1539 | switch (vstack_ax(stack)->type) { | |
1540 | case REG_S64: | |
1541 | break; | |
1542 | default: | |
1543 | ERR("Incorrect register type %d for operation\n", | |
1544 | (int) vstack_ax(stack)->type); | |
1545 | ret = -EINVAL; | |
1546 | goto end; | |
1547 | } | |
1548 | ||
bf956ec0 | 1549 | /* Continue to next instruction */ |
71c1ceeb MD |
1550 | /* Pop 1 when jump not taken */ |
1551 | if (vstack_pop(stack)) { | |
1552 | ret = -EINVAL; | |
1553 | goto end; | |
1554 | } | |
bf956ec0 MD |
1555 | next_pc += sizeof(struct logical_op); |
1556 | break; | |
1557 | } | |
1558 | ||
77aa5901 | 1559 | /* load field ref */ |
bf956ec0 MD |
1560 | case FILTER_OP_LOAD_FIELD_REF: |
1561 | { | |
1562 | ERR("Unknown field ref type\n"); | |
1563 | ret = -EINVAL; | |
1564 | goto end; | |
1565 | } | |
77aa5901 MD |
1566 | /* get context ref */ |
1567 | case FILTER_OP_GET_CONTEXT_REF: | |
1568 | { | |
53569322 MD |
1569 | if (vstack_push(stack)) { |
1570 | ret = -EINVAL; | |
1571 | goto end; | |
1572 | } | |
1573 | vstack_ax(stack)->type = REG_UNKNOWN; | |
1574 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1575 | break; | |
77aa5901 | 1576 | } |
bf956ec0 MD |
1577 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
1578 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
77aa5901 | 1579 | case FILTER_OP_GET_CONTEXT_REF_STRING: |
bf956ec0 | 1580 | { |
0305960f MD |
1581 | if (vstack_push(stack)) { |
1582 | ret = -EINVAL; | |
1583 | goto end; | |
1584 | } | |
1585 | vstack_ax(stack)->type = REG_STRING; | |
bf956ec0 MD |
1586 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
1587 | break; | |
1588 | } | |
1589 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
77aa5901 | 1590 | case FILTER_OP_GET_CONTEXT_REF_S64: |
bf956ec0 | 1591 | { |
0305960f MD |
1592 | if (vstack_push(stack)) { |
1593 | ret = -EINVAL; | |
1594 | goto end; | |
1595 | } | |
1596 | vstack_ax(stack)->type = REG_S64; | |
bf956ec0 MD |
1597 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
1598 | break; | |
1599 | } | |
1600 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
77aa5901 | 1601 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: |
bf956ec0 | 1602 | { |
0305960f MD |
1603 | if (vstack_push(stack)) { |
1604 | ret = -EINVAL; | |
1605 | goto end; | |
1606 | } | |
1607 | vstack_ax(stack)->type = REG_DOUBLE; | |
bf956ec0 MD |
1608 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
1609 | break; | |
1610 | } | |
1611 | ||
77aa5901 | 1612 | /* load from immediate operand */ |
bf956ec0 MD |
1613 | case FILTER_OP_LOAD_STRING: |
1614 | { | |
1615 | struct load_op *insn = (struct load_op *) pc; | |
1616 | ||
0305960f MD |
1617 | if (vstack_push(stack)) { |
1618 | ret = -EINVAL; | |
1619 | goto end; | |
1620 | } | |
1621 | vstack_ax(stack)->type = REG_STRING; | |
bf956ec0 MD |
1622 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
1623 | break; | |
1624 | } | |
1625 | ||
3151a51d PP |
1626 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
1627 | { | |
1628 | struct load_op *insn = (struct load_op *) pc; | |
1629 | ||
1630 | if (vstack_push(stack)) { | |
1631 | ret = -EINVAL; | |
1632 | goto end; | |
1633 | } | |
1634 | vstack_ax(stack)->type = REG_STAR_GLOB_STRING; | |
1635 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
1636 | break; | |
1637 | } | |
1638 | ||
bf956ec0 MD |
1639 | case FILTER_OP_LOAD_S64: |
1640 | { | |
0305960f MD |
1641 | if (vstack_push(stack)) { |
1642 | ret = -EINVAL; | |
1643 | goto end; | |
1644 | } | |
1645 | vstack_ax(stack)->type = REG_S64; | |
bf956ec0 MD |
1646 | next_pc += sizeof(struct load_op) |
1647 | + sizeof(struct literal_numeric); | |
1648 | break; | |
1649 | } | |
1650 | ||
1651 | case FILTER_OP_LOAD_DOUBLE: | |
1652 | { | |
0305960f MD |
1653 | if (vstack_push(stack)) { |
1654 | ret = -EINVAL; | |
1655 | goto end; | |
1656 | } | |
1657 | vstack_ax(stack)->type = REG_DOUBLE; | |
bf956ec0 MD |
1658 | next_pc += sizeof(struct load_op) |
1659 | + sizeof(struct literal_double); | |
1660 | break; | |
1661 | } | |
1662 | ||
1663 | case FILTER_OP_CAST_TO_S64: | |
1664 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
1665 | { | |
0305960f MD |
1666 | /* Pop 1, push 1 */ |
1667 | if (!vstack_ax(stack)) { | |
1668 | ERR("Empty stack\n"); | |
1669 | ret = -EINVAL; | |
1670 | goto end; | |
1671 | } | |
47e5f13e MD |
1672 | switch (vstack_ax(stack)->type) { |
1673 | case REG_S64: | |
1674 | case REG_DOUBLE: | |
1675 | case REG_UNKNOWN: | |
1676 | break; | |
1677 | default: | |
1678 | ERR("Incorrect register type %d for cast\n", | |
1679 | (int) vstack_ax(stack)->type); | |
1680 | ret = -EINVAL; | |
1681 | goto end; | |
1682 | } | |
0305960f | 1683 | vstack_ax(stack)->type = REG_S64; |
bf956ec0 MD |
1684 | next_pc += sizeof(struct cast_op); |
1685 | break; | |
1686 | } | |
1687 | case FILTER_OP_CAST_NOP: | |
1688 | { | |
1689 | next_pc += sizeof(struct cast_op); | |
1690 | break; | |
1691 | } | |
97b58163 | 1692 | |
47e5f13e MD |
1693 | /* |
1694 | * Instructions for recursive traversal through composed types. | |
1695 | */ | |
1696 | case FILTER_OP_GET_CONTEXT_ROOT: | |
1697 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
1698 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
1699 | { | |
1700 | if (vstack_push(stack)) { | |
1701 | ret = -EINVAL; | |
1702 | goto end; | |
1703 | } | |
1704 | vstack_ax(stack)->type = REG_PTR; | |
1705 | next_pc += sizeof(struct load_op); | |
1706 | break; | |
1707 | } | |
1708 | ||
1709 | case FILTER_OP_LOAD_FIELD: | |
1710 | { | |
1711 | /* Pop 1, push 1 */ | |
1712 | if (!vstack_ax(stack)) { | |
1713 | ERR("Empty stack\n"); | |
1714 | ret = -EINVAL; | |
1715 | goto end; | |
1716 | } | |
1717 | if (vstack_ax(stack)->type != REG_PTR) { | |
1718 | ERR("Expecting pointer on top of stack\n"); | |
1719 | ret = -EINVAL; | |
1720 | goto end; | |
1721 | } | |
1722 | vstack_ax(stack)->type = REG_UNKNOWN; | |
1723 | next_pc += sizeof(struct load_op); | |
1724 | break; | |
1725 | } | |
1726 | ||
1727 | case FILTER_OP_LOAD_FIELD_S8: | |
1728 | case FILTER_OP_LOAD_FIELD_S16: | |
1729 | case FILTER_OP_LOAD_FIELD_S32: | |
1730 | case FILTER_OP_LOAD_FIELD_S64: | |
1731 | case FILTER_OP_LOAD_FIELD_U8: | |
1732 | case FILTER_OP_LOAD_FIELD_U16: | |
1733 | case FILTER_OP_LOAD_FIELD_U32: | |
1734 | case FILTER_OP_LOAD_FIELD_U64: | |
1735 | { | |
1736 | /* Pop 1, push 1 */ | |
1737 | if (!vstack_ax(stack)) { | |
1738 | ERR("Empty stack\n"); | |
1739 | ret = -EINVAL; | |
1740 | goto end; | |
1741 | } | |
1742 | if (vstack_ax(stack)->type != REG_PTR) { | |
1743 | ERR("Expecting pointer on top of stack\n"); | |
1744 | ret = -EINVAL; | |
1745 | goto end; | |
1746 | } | |
1747 | vstack_ax(stack)->type = REG_S64; | |
1748 | next_pc += sizeof(struct load_op); | |
1749 | break; | |
1750 | } | |
1751 | ||
1752 | case FILTER_OP_LOAD_FIELD_STRING: | |
1753 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
1754 | { | |
1755 | /* Pop 1, push 1 */ | |
1756 | if (!vstack_ax(stack)) { | |
1757 | ERR("Empty stack\n"); | |
1758 | ret = -EINVAL; | |
1759 | goto end; | |
1760 | } | |
1761 | if (vstack_ax(stack)->type != REG_PTR) { | |
1762 | ERR("Expecting pointer on top of stack\n"); | |
1763 | ret = -EINVAL; | |
1764 | goto end; | |
1765 | } | |
1766 | vstack_ax(stack)->type = REG_STRING; | |
1767 | next_pc += sizeof(struct load_op); | |
1768 | break; | |
1769 | } | |
1770 | ||
1771 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
1772 | { | |
1773 | /* Pop 1, push 1 */ | |
1774 | if (!vstack_ax(stack)) { | |
1775 | ERR("Empty stack\n"); | |
1776 | ret = -EINVAL; | |
1777 | goto end; | |
1778 | } | |
1779 | if (vstack_ax(stack)->type != REG_PTR) { | |
1780 | ERR("Expecting pointer on top of stack\n"); | |
1781 | ret = -EINVAL; | |
1782 | goto end; | |
1783 | } | |
1784 | vstack_ax(stack)->type = REG_DOUBLE; | |
1785 | next_pc += sizeof(struct load_op); | |
1786 | break; | |
1787 | } | |
1788 | ||
1789 | case FILTER_OP_GET_SYMBOL: | |
1790 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1791 | { | |
1792 | /* Pop 1, push 1 */ | |
1793 | if (!vstack_ax(stack)) { | |
1794 | ERR("Empty stack\n"); | |
1795 | ret = -EINVAL; | |
1796 | goto end; | |
1797 | } | |
1798 | if (vstack_ax(stack)->type != REG_PTR) { | |
1799 | ERR("Expecting pointer on top of stack\n"); | |
1800 | ret = -EINVAL; | |
1801 | goto end; | |
1802 | } | |
1803 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); | |
1804 | break; | |
1805 | } | |
1806 | ||
1807 | case FILTER_OP_GET_INDEX_U16: | |
1808 | { | |
1809 | /* Pop 1, push 1 */ | |
1810 | if (!vstack_ax(stack)) { | |
1811 | ERR("Empty stack\n"); | |
1812 | ret = -EINVAL; | |
1813 | goto end; | |
1814 | } | |
1815 | if (vstack_ax(stack)->type != REG_PTR) { | |
1816 | ERR("Expecting pointer on top of stack\n"); | |
1817 | ret = -EINVAL; | |
1818 | goto end; | |
1819 | } | |
1820 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); | |
1821 | break; | |
1822 | } | |
1823 | ||
1824 | case FILTER_OP_GET_INDEX_U64: | |
1825 | { | |
1826 | /* Pop 1, push 1 */ | |
1827 | if (!vstack_ax(stack)) { | |
1828 | ERR("Empty stack\n"); | |
1829 | ret = -EINVAL; | |
1830 | goto end; | |
1831 | } | |
1832 | if (vstack_ax(stack)->type != REG_PTR) { | |
1833 | ERR("Expecting pointer on top of stack\n"); | |
1834 | ret = -EINVAL; | |
1835 | goto end; | |
1836 | } | |
1837 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); | |
1838 | break; | |
1839 | } | |
1840 | ||
bf956ec0 MD |
1841 | } |
1842 | end: | |
1843 | *_next_pc = next_pc; | |
1844 | return ret; | |
1845 | } | |
1846 | ||
1847 | /* | |
1848 | * Never called concurrently (hash seed is shared). | |
1849 | */ | |
1850 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) | |
1851 | { | |
1852 | struct cds_lfht *merge_points; | |
22389ecb | 1853 | char *pc, *next_pc, *start_pc; |
bf956ec0 | 1854 | int ret = -EINVAL; |
0305960f | 1855 | struct vstack stack; |
bf956ec0 | 1856 | |
0305960f | 1857 | vstack_init(&stack); |
bf956ec0 MD |
1858 | |
1859 | if (!lttng_hash_seed_ready) { | |
1860 | lttng_hash_seed = time(NULL); | |
1861 | lttng_hash_seed_ready = 1; | |
1862 | } | |
1863 | /* | |
1864 | * Note: merge_points hash table used by single thread, and | |
1865 | * never concurrently resized. Therefore, we can use it without | |
1866 | * holding RCU read-side lock and free nodes without using | |
1867 | * call_rcu. | |
1868 | */ | |
1869 | merge_points = cds_lfht_new(DEFAULT_NR_MERGE_POINTS, | |
1870 | MIN_NR_BUCKETS, MAX_NR_BUCKETS, | |
1871 | 0, NULL); | |
1872 | if (!merge_points) { | |
1873 | ERR("Error allocating hash table for bytecode validation\n"); | |
1874 | return -ENOMEM; | |
1875 | } | |
47e5f13e | 1876 | start_pc = &bytecode->code[0]; |
bf956ec0 MD |
1877 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
1878 | pc = next_pc) { | |
82513dbe MD |
1879 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); |
1880 | if (ret != 0) { | |
1881 | if (ret == -ERANGE) | |
1882 | ERR("filter bytecode overflow\n"); | |
bf956ec0 | 1883 | goto end; |
97b58163 | 1884 | } |
bf956ec0 MD |
1885 | dbg_printf("Validating op %s (%u)\n", |
1886 | print_op((unsigned int) *(filter_opcode_t *) pc), | |
1887 | (unsigned int) *(filter_opcode_t *) pc); | |
1888 | ||
1889 | /* | |
1890 | * For each instruction, validate the current context | |
1891 | * (traversal of entire execution flow), and validate | |
53569322 | 1892 | * all merge points targeting this instruction. |
bf956ec0 MD |
1893 | */ |
1894 | ret = validate_instruction_all_contexts(bytecode, merge_points, | |
0305960f | 1895 | &stack, start_pc, pc); |
bf956ec0 MD |
1896 | if (ret) |
1897 | goto end; | |
0305960f | 1898 | ret = exec_insn(bytecode, merge_points, &stack, &next_pc, pc); |
bf956ec0 MD |
1899 | if (ret <= 0) |
1900 | goto end; | |
97b58163 MD |
1901 | } |
1902 | end: | |
bf956ec0 MD |
1903 | if (delete_all_nodes(merge_points)) { |
1904 | if (!ret) { | |
1905 | ERR("Unexpected merge points\n"); | |
1906 | ret = -EINVAL; | |
1907 | } | |
1908 | } | |
1909 | if (cds_lfht_destroy(merge_points, NULL)) { | |
1910 | ERR("Error destroying hash table\n"); | |
1911 | } | |
97b58163 MD |
1912 | return ret; |
1913 | } |