Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: MIT |
2 | * | |
07dfc1d0 MD |
3 | * lttng-filter-validator.c |
4 | * | |
5 | * LTTng modules filter bytecode validator. | |
6 | * | |
bbf3aef5 | 7 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
07dfc1d0 MD |
8 | */ |
9 | ||
499cc3f7 | 10 | #include <linux/types.h> |
07dfc1d0 MD |
11 | #include <linux/jhash.h> |
12 | #include <linux/slab.h> | |
13 | ||
241ae9a8 MD |
14 | #include <wrapper/list.h> |
15 | #include <lttng-filter.h> | |
07dfc1d0 MD |
16 | |
17 | #define MERGE_POINT_TABLE_BITS 7 | |
18 | #define MERGE_POINT_TABLE_SIZE (1U << MERGE_POINT_TABLE_BITS) | |
19 | ||
20 | /* merge point table node */ | |
21 | struct mp_node { | |
22 | struct hlist_node node; | |
23 | ||
24 | /* Context at merge point */ | |
25 | struct vstack stack; | |
26 | unsigned long target_pc; | |
27 | }; | |
28 | ||
29 | struct mp_table { | |
30 | struct hlist_head mp_head[MERGE_POINT_TABLE_SIZE]; | |
31 | }; | |
32 | ||
33 | static | |
34 | int lttng_hash_match(struct mp_node *mp_node, unsigned long key_pc) | |
35 | { | |
36 | if (mp_node->target_pc == key_pc) | |
37 | return 1; | |
38 | else | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static | |
43 | int merge_points_compare(const struct vstack *stacka, | |
44 | const struct vstack *stackb) | |
45 | { | |
46 | int i, len; | |
47 | ||
48 | if (stacka->top != stackb->top) | |
49 | return 1; | |
50 | len = stacka->top + 1; | |
51 | WARN_ON_ONCE(len < 0); | |
52 | for (i = 0; i < len; i++) { | |
53 | if (stacka->e[i].type != stackb->e[i].type) | |
54 | return 1; | |
55 | } | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static | |
60 | int merge_point_add_check(struct mp_table *mp_table, unsigned long target_pc, | |
61 | const struct vstack *stack) | |
62 | { | |
63 | struct mp_node *mp_node; | |
64 | unsigned long hash = jhash_1word(target_pc, 0); | |
65 | struct hlist_head *head; | |
66 | struct mp_node *lookup_node; | |
67 | int found = 0; | |
68 | ||
69 | dbg_printk("Filter: adding merge point at offset %lu, hash %lu\n", | |
70 | target_pc, hash); | |
71 | mp_node = kzalloc(sizeof(struct mp_node), GFP_KERNEL); | |
72 | if (!mp_node) | |
73 | return -ENOMEM; | |
74 | mp_node->target_pc = target_pc; | |
75 | memcpy(&mp_node->stack, stack, sizeof(mp_node->stack)); | |
76 | ||
77 | head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)]; | |
d216ecae | 78 | lttng_hlist_for_each_entry(lookup_node, head, node) { |
07dfc1d0 MD |
79 | if (lttng_hash_match(lookup_node, target_pc)) { |
80 | found = 1; | |
81 | break; | |
82 | } | |
83 | } | |
84 | if (found) { | |
85 | /* Key already present */ | |
86 | dbg_printk("Filter: compare merge points for offset %lu, hash %lu\n", | |
87 | target_pc, hash); | |
88 | kfree(mp_node); | |
89 | if (merge_points_compare(stack, &lookup_node->stack)) { | |
90 | printk(KERN_WARNING "Merge points differ for offset %lu\n", | |
91 | target_pc); | |
92 | return -EINVAL; | |
93 | } | |
5e13eb3c MD |
94 | } else { |
95 | hlist_add_head(&mp_node->node, head); | |
07dfc1d0 | 96 | } |
07dfc1d0 MD |
97 | return 0; |
98 | } | |
99 | ||
100 | /* | |
101 | * Binary comparators use top of stack and top of stack -1. | |
102 | */ | |
103 | static | |
02aca193 PP |
104 | int bin_op_compare_check(struct vstack *stack, const filter_opcode_t opcode, |
105 | const char *str) | |
07dfc1d0 MD |
106 | { |
107 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) | |
3834b99f | 108 | goto error_empty; |
07dfc1d0 MD |
109 | |
110 | switch (vstack_ax(stack)->type) { | |
111 | default: | |
112 | case REG_DOUBLE: | |
3834b99f | 113 | goto error_type; |
07dfc1d0 MD |
114 | |
115 | case REG_STRING: | |
116 | switch (vstack_bx(stack)->type) { | |
117 | default: | |
118 | case REG_DOUBLE: | |
3834b99f MD |
119 | goto error_type; |
120 | case REG_TYPE_UNKNOWN: | |
121 | goto unknown; | |
07dfc1d0 MD |
122 | case REG_STRING: |
123 | break; | |
02aca193 PP |
124 | case REG_STAR_GLOB_STRING: |
125 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { | |
126 | goto error_mismatch; | |
127 | } | |
128 | break; | |
129 | case REG_S64: | |
130 | goto error_mismatch; | |
131 | } | |
132 | break; | |
133 | case REG_STAR_GLOB_STRING: | |
134 | switch (vstack_bx(stack)->type) { | |
135 | default: | |
136 | case REG_DOUBLE: | |
3834b99f MD |
137 | goto error_type; |
138 | case REG_TYPE_UNKNOWN: | |
139 | goto unknown; | |
02aca193 PP |
140 | case REG_STRING: |
141 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { | |
142 | goto error_mismatch; | |
143 | } | |
144 | break; | |
145 | case REG_STAR_GLOB_STRING: | |
07dfc1d0 MD |
146 | case REG_S64: |
147 | goto error_mismatch; | |
148 | } | |
149 | break; | |
150 | case REG_S64: | |
151 | switch (vstack_bx(stack)->type) { | |
152 | default: | |
153 | case REG_DOUBLE: | |
3834b99f MD |
154 | goto error_type; |
155 | case REG_TYPE_UNKNOWN: | |
156 | goto unknown; | |
07dfc1d0 | 157 | case REG_STRING: |
02aca193 | 158 | case REG_STAR_GLOB_STRING: |
07dfc1d0 | 159 | goto error_mismatch; |
07dfc1d0 MD |
160 | case REG_S64: |
161 | break; | |
162 | } | |
163 | break; | |
3834b99f MD |
164 | case REG_TYPE_UNKNOWN: |
165 | switch (vstack_bx(stack)->type) { | |
166 | default: | |
167 | case REG_DOUBLE: | |
168 | goto error_type; | |
169 | case REG_TYPE_UNKNOWN: | |
170 | case REG_STRING: | |
171 | case REG_STAR_GLOB_STRING: | |
172 | case REG_S64: | |
173 | goto unknown; | |
174 | } | |
175 | break; | |
07dfc1d0 MD |
176 | } |
177 | return 0; | |
178 | ||
3834b99f MD |
179 | unknown: |
180 | return 1; | |
181 | ||
182 | error_empty: | |
183 | printk(KERN_WARNING "empty stack for '%s' binary operator\n", str); | |
07dfc1d0 MD |
184 | return -EINVAL; |
185 | ||
186 | error_mismatch: | |
187 | printk(KERN_WARNING "type mismatch for '%s' binary operator\n", str); | |
188 | return -EINVAL; | |
3834b99f MD |
189 | |
190 | error_type: | |
191 | printk(KERN_WARNING "unknown type for '%s' binary operator\n", str); | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Binary bitwise operators use top of stack and top of stack -1. | |
197 | * Return 0 if typing is known to match, 1 if typing is dynamic | |
198 | * (unknown), negative error value on error. | |
199 | */ | |
200 | static | |
201 | int bin_op_bitwise_check(struct vstack *stack, filter_opcode_t opcode, | |
202 | const char *str) | |
203 | { | |
204 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) | |
205 | goto error_empty; | |
206 | ||
207 | switch (vstack_ax(stack)->type) { | |
208 | default: | |
209 | case REG_DOUBLE: | |
210 | goto error_type; | |
211 | ||
212 | case REG_TYPE_UNKNOWN: | |
213 | switch (vstack_bx(stack)->type) { | |
214 | default: | |
215 | case REG_DOUBLE: | |
216 | goto error_type; | |
217 | case REG_TYPE_UNKNOWN: | |
218 | case REG_STRING: | |
219 | case REG_STAR_GLOB_STRING: | |
220 | case REG_S64: | |
221 | goto unknown; | |
222 | } | |
223 | break; | |
224 | case REG_S64: | |
225 | switch (vstack_bx(stack)->type) { | |
226 | default: | |
227 | case REG_DOUBLE: | |
228 | goto error_type; | |
229 | case REG_TYPE_UNKNOWN: | |
230 | goto unknown; | |
231 | case REG_S64: | |
232 | break; | |
233 | } | |
234 | break; | |
235 | } | |
236 | return 0; | |
237 | ||
238 | unknown: | |
239 | return 1; | |
240 | ||
241 | error_empty: | |
242 | printk(KERN_WARNING "empty stack for '%s' binary operator\n", str); | |
243 | return -EINVAL; | |
244 | ||
245 | error_type: | |
246 | printk(KERN_WARNING "unknown type for '%s' binary operator\n", str); | |
247 | return -EINVAL; | |
248 | } | |
249 | ||
250 | static | |
251 | int validate_get_symbol(struct bytecode_runtime *bytecode, | |
252 | const struct get_symbol *sym) | |
253 | { | |
254 | const char *str, *str_limit; | |
255 | size_t len_limit; | |
256 | ||
257 | if (sym->offset >= bytecode->p.bc->bc.len - bytecode->p.bc->bc.reloc_offset) | |
258 | return -EINVAL; | |
259 | ||
260 | str = bytecode->p.bc->bc.data + bytecode->p.bc->bc.reloc_offset + sym->offset; | |
261 | str_limit = bytecode->p.bc->bc.data + bytecode->p.bc->bc.len; | |
262 | len_limit = str_limit - str; | |
263 | if (strnlen(str, len_limit) == len_limit) | |
264 | return -EINVAL; | |
265 | return 0; | |
07dfc1d0 MD |
266 | } |
267 | ||
268 | /* | |
269 | * Validate bytecode range overflow within the validation pass. | |
270 | * Called for each instruction encountered. | |
271 | */ | |
272 | static | |
273 | int bytecode_validate_overflow(struct bytecode_runtime *bytecode, | |
7962cb86 | 274 | char *start_pc, char *pc) |
07dfc1d0 MD |
275 | { |
276 | int ret = 0; | |
277 | ||
278 | switch (*(filter_opcode_t *) pc) { | |
279 | case FILTER_OP_UNKNOWN: | |
280 | default: | |
281 | { | |
282 | printk(KERN_WARNING "unknown bytecode op %u\n", | |
283 | (unsigned int) *(filter_opcode_t *) pc); | |
284 | ret = -EINVAL; | |
285 | break; | |
286 | } | |
287 | ||
288 | case FILTER_OP_RETURN: | |
57ba4b41 | 289 | case FILTER_OP_RETURN_S64: |
07dfc1d0 MD |
290 | { |
291 | if (unlikely(pc + sizeof(struct return_op) | |
292 | > start_pc + bytecode->len)) { | |
293 | ret = -ERANGE; | |
294 | } | |
295 | break; | |
296 | } | |
297 | ||
298 | /* binary */ | |
299 | case FILTER_OP_MUL: | |
300 | case FILTER_OP_DIV: | |
301 | case FILTER_OP_MOD: | |
302 | case FILTER_OP_PLUS: | |
303 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
304 | case FILTER_OP_EQ_DOUBLE: |
305 | case FILTER_OP_NE_DOUBLE: | |
306 | case FILTER_OP_GT_DOUBLE: | |
307 | case FILTER_OP_LT_DOUBLE: | |
308 | case FILTER_OP_GE_DOUBLE: | |
309 | case FILTER_OP_LE_DOUBLE: | |
310 | /* Floating point */ | |
311 | case FILTER_OP_EQ_DOUBLE_S64: | |
312 | case FILTER_OP_NE_DOUBLE_S64: | |
313 | case FILTER_OP_GT_DOUBLE_S64: | |
314 | case FILTER_OP_LT_DOUBLE_S64: | |
315 | case FILTER_OP_GE_DOUBLE_S64: | |
316 | case FILTER_OP_LE_DOUBLE_S64: | |
317 | case FILTER_OP_EQ_S64_DOUBLE: | |
318 | case FILTER_OP_NE_S64_DOUBLE: | |
319 | case FILTER_OP_GT_S64_DOUBLE: | |
320 | case FILTER_OP_LT_S64_DOUBLE: | |
321 | case FILTER_OP_GE_S64_DOUBLE: | |
322 | case FILTER_OP_LE_S64_DOUBLE: | |
323 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
324 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
325 | case FILTER_OP_LOAD_DOUBLE: | |
326 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
327 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
328 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
329 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
330 | { | |
331 | printk(KERN_WARNING "unsupported bytecode op %u\n", | |
332 | (unsigned int) *(filter_opcode_t *) pc); | |
333 | ret = -EINVAL; | |
334 | break; | |
335 | } | |
336 | ||
337 | case FILTER_OP_EQ: | |
338 | case FILTER_OP_NE: | |
339 | case FILTER_OP_GT: | |
340 | case FILTER_OP_LT: | |
341 | case FILTER_OP_GE: | |
342 | case FILTER_OP_LE: | |
343 | case FILTER_OP_EQ_STRING: | |
344 | case FILTER_OP_NE_STRING: | |
345 | case FILTER_OP_GT_STRING: | |
346 | case FILTER_OP_LT_STRING: | |
347 | case FILTER_OP_GE_STRING: | |
348 | case FILTER_OP_LE_STRING: | |
02aca193 PP |
349 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
350 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
07dfc1d0 MD |
351 | case FILTER_OP_EQ_S64: |
352 | case FILTER_OP_NE_S64: | |
353 | case FILTER_OP_GT_S64: | |
354 | case FILTER_OP_LT_S64: | |
355 | case FILTER_OP_GE_S64: | |
356 | case FILTER_OP_LE_S64: | |
e16c054b MD |
357 | case FILTER_OP_BIT_RSHIFT: |
358 | case FILTER_OP_BIT_LSHIFT: | |
3834b99f MD |
359 | case FILTER_OP_BIT_AND: |
360 | case FILTER_OP_BIT_OR: | |
361 | case FILTER_OP_BIT_XOR: | |
07dfc1d0 MD |
362 | { |
363 | if (unlikely(pc + sizeof(struct binary_op) | |
364 | > start_pc + bytecode->len)) { | |
365 | ret = -ERANGE; | |
366 | } | |
367 | break; | |
368 | } | |
369 | ||
370 | /* unary */ | |
371 | case FILTER_OP_UNARY_PLUS: | |
372 | case FILTER_OP_UNARY_MINUS: | |
373 | case FILTER_OP_UNARY_NOT: | |
374 | case FILTER_OP_UNARY_PLUS_S64: | |
375 | case FILTER_OP_UNARY_MINUS_S64: | |
376 | case FILTER_OP_UNARY_NOT_S64: | |
e16c054b | 377 | case FILTER_OP_UNARY_BIT_NOT: |
07dfc1d0 MD |
378 | { |
379 | if (unlikely(pc + sizeof(struct unary_op) | |
380 | > start_pc + bytecode->len)) { | |
381 | ret = -ERANGE; | |
382 | } | |
383 | break; | |
384 | } | |
385 | ||
386 | /* logical */ | |
387 | case FILTER_OP_AND: | |
388 | case FILTER_OP_OR: | |
389 | { | |
390 | if (unlikely(pc + sizeof(struct logical_op) | |
391 | > start_pc + bytecode->len)) { | |
392 | ret = -ERANGE; | |
393 | } | |
394 | break; | |
395 | } | |
396 | ||
397 | /* load field ref */ | |
398 | case FILTER_OP_LOAD_FIELD_REF: | |
399 | { | |
400 | printk(KERN_WARNING "Unknown field ref type\n"); | |
401 | ret = -EINVAL; | |
402 | break; | |
403 | } | |
3834b99f | 404 | |
07dfc1d0 MD |
405 | /* get context ref */ |
406 | case FILTER_OP_GET_CONTEXT_REF: | |
407 | { | |
408 | printk(KERN_WARNING "Unknown field ref type\n"); | |
409 | ret = -EINVAL; | |
410 | break; | |
411 | } | |
412 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
413 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
f127e61e MD |
414 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
415 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
416 | case FILTER_OP_LOAD_FIELD_REF_S64: |
417 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
418 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
419 | { | |
420 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) | |
421 | > start_pc + bytecode->len)) { | |
422 | ret = -ERANGE; | |
423 | } | |
424 | break; | |
425 | } | |
426 | ||
427 | /* load from immediate operand */ | |
428 | case FILTER_OP_LOAD_STRING: | |
02aca193 | 429 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
07dfc1d0 MD |
430 | { |
431 | struct load_op *insn = (struct load_op *) pc; | |
432 | uint32_t str_len, maxlen; | |
433 | ||
434 | if (unlikely(pc + sizeof(struct load_op) | |
435 | > start_pc + bytecode->len)) { | |
436 | ret = -ERANGE; | |
437 | break; | |
438 | } | |
439 | ||
440 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); | |
441 | str_len = strnlen(insn->data, maxlen); | |
442 | if (unlikely(str_len >= maxlen)) { | |
443 | /* Final '\0' not found within range */ | |
444 | ret = -ERANGE; | |
445 | } | |
446 | break; | |
447 | } | |
448 | ||
449 | case FILTER_OP_LOAD_S64: | |
450 | { | |
451 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) | |
452 | > start_pc + bytecode->len)) { | |
453 | ret = -ERANGE; | |
454 | } | |
455 | break; | |
456 | } | |
457 | ||
458 | case FILTER_OP_CAST_TO_S64: | |
459 | case FILTER_OP_CAST_NOP: | |
460 | { | |
461 | if (unlikely(pc + sizeof(struct cast_op) | |
462 | > start_pc + bytecode->len)) { | |
463 | ret = -ERANGE; | |
464 | } | |
465 | break; | |
466 | } | |
467 | ||
3834b99f MD |
468 | /* |
469 | * Instructions for recursive traversal through composed types. | |
470 | */ | |
471 | case FILTER_OP_GET_CONTEXT_ROOT: | |
472 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
473 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
474 | case FILTER_OP_LOAD_FIELD: | |
475 | case FILTER_OP_LOAD_FIELD_S8: | |
476 | case FILTER_OP_LOAD_FIELD_S16: | |
477 | case FILTER_OP_LOAD_FIELD_S32: | |
478 | case FILTER_OP_LOAD_FIELD_S64: | |
479 | case FILTER_OP_LOAD_FIELD_U8: | |
480 | case FILTER_OP_LOAD_FIELD_U16: | |
481 | case FILTER_OP_LOAD_FIELD_U32: | |
482 | case FILTER_OP_LOAD_FIELD_U64: | |
483 | case FILTER_OP_LOAD_FIELD_STRING: | |
484 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
485 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
486 | if (unlikely(pc + sizeof(struct load_op) | |
487 | > start_pc + bytecode->len)) { | |
488 | ret = -ERANGE; | |
489 | } | |
490 | break; | |
491 | ||
492 | case FILTER_OP_GET_SYMBOL: | |
493 | { | |
494 | struct load_op *insn = (struct load_op *) pc; | |
495 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
496 | ||
497 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol) | |
498 | > start_pc + bytecode->len)) { | |
499 | ret = -ERANGE; | |
3aeca857 | 500 | break; |
3834b99f MD |
501 | } |
502 | ret = validate_get_symbol(bytecode, sym); | |
503 | break; | |
504 | } | |
505 | ||
506 | case FILTER_OP_GET_SYMBOL_FIELD: | |
507 | printk(KERN_WARNING "Unexpected get symbol field\n"); | |
508 | ret = -EINVAL; | |
509 | break; | |
510 | ||
511 | case FILTER_OP_GET_INDEX_U16: | |
512 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16) | |
513 | > start_pc + bytecode->len)) { | |
514 | ret = -ERANGE; | |
515 | } | |
516 | break; | |
517 | ||
518 | case FILTER_OP_GET_INDEX_U64: | |
519 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64) | |
520 | > start_pc + bytecode->len)) { | |
521 | ret = -ERANGE; | |
522 | } | |
523 | break; | |
07dfc1d0 MD |
524 | } |
525 | ||
526 | return ret; | |
527 | } | |
528 | ||
529 | static | |
530 | unsigned long delete_all_nodes(struct mp_table *mp_table) | |
531 | { | |
532 | struct mp_node *mp_node; | |
533 | struct hlist_node *tmp; | |
534 | unsigned long nr_nodes = 0; | |
535 | int i; | |
536 | ||
537 | for (i = 0; i < MERGE_POINT_TABLE_SIZE; i++) { | |
538 | struct hlist_head *head; | |
539 | ||
540 | head = &mp_table->mp_head[i]; | |
d216ecae | 541 | lttng_hlist_for_each_entry_safe(mp_node, tmp, head, node) { |
07dfc1d0 MD |
542 | kfree(mp_node); |
543 | nr_nodes++; | |
544 | } | |
545 | } | |
546 | return nr_nodes; | |
547 | } | |
548 | ||
549 | /* | |
550 | * Return value: | |
3834b99f | 551 | * >=0: success |
07dfc1d0 MD |
552 | * <0: error |
553 | */ | |
554 | static | |
555 | int validate_instruction_context(struct bytecode_runtime *bytecode, | |
556 | struct vstack *stack, | |
7962cb86 MD |
557 | char *start_pc, |
558 | char *pc) | |
07dfc1d0 MD |
559 | { |
560 | int ret = 0; | |
02aca193 | 561 | const filter_opcode_t opcode = *(filter_opcode_t *) pc; |
07dfc1d0 | 562 | |
02aca193 | 563 | switch (opcode) { |
07dfc1d0 MD |
564 | case FILTER_OP_UNKNOWN: |
565 | default: | |
566 | { | |
567 | printk(KERN_WARNING "unknown bytecode op %u\n", | |
568 | (unsigned int) *(filter_opcode_t *) pc); | |
569 | ret = -EINVAL; | |
570 | goto end; | |
571 | } | |
572 | ||
573 | case FILTER_OP_RETURN: | |
57ba4b41 | 574 | case FILTER_OP_RETURN_S64: |
07dfc1d0 MD |
575 | { |
576 | goto end; | |
577 | } | |
578 | ||
579 | /* binary */ | |
580 | case FILTER_OP_MUL: | |
581 | case FILTER_OP_DIV: | |
582 | case FILTER_OP_MOD: | |
583 | case FILTER_OP_PLUS: | |
584 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
585 | /* Floating point */ |
586 | case FILTER_OP_EQ_DOUBLE: | |
587 | case FILTER_OP_NE_DOUBLE: | |
588 | case FILTER_OP_GT_DOUBLE: | |
589 | case FILTER_OP_LT_DOUBLE: | |
590 | case FILTER_OP_GE_DOUBLE: | |
591 | case FILTER_OP_LE_DOUBLE: | |
592 | case FILTER_OP_EQ_DOUBLE_S64: | |
593 | case FILTER_OP_NE_DOUBLE_S64: | |
594 | case FILTER_OP_GT_DOUBLE_S64: | |
595 | case FILTER_OP_LT_DOUBLE_S64: | |
596 | case FILTER_OP_GE_DOUBLE_S64: | |
597 | case FILTER_OP_LE_DOUBLE_S64: | |
598 | case FILTER_OP_EQ_S64_DOUBLE: | |
599 | case FILTER_OP_NE_S64_DOUBLE: | |
600 | case FILTER_OP_GT_S64_DOUBLE: | |
601 | case FILTER_OP_LT_S64_DOUBLE: | |
602 | case FILTER_OP_GE_S64_DOUBLE: | |
603 | case FILTER_OP_LE_S64_DOUBLE: | |
604 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
605 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
606 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
607 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
608 | case FILTER_OP_LOAD_DOUBLE: | |
609 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
610 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
611 | { | |
612 | printk(KERN_WARNING "unsupported bytecode op %u\n", | |
613 | (unsigned int) *(filter_opcode_t *) pc); | |
614 | ret = -EINVAL; | |
615 | goto end; | |
616 | } | |
617 | ||
618 | case FILTER_OP_EQ: | |
619 | { | |
02aca193 | 620 | ret = bin_op_compare_check(stack, opcode, "=="); |
3834b99f | 621 | if (ret < 0) |
07dfc1d0 MD |
622 | goto end; |
623 | break; | |
624 | } | |
625 | case FILTER_OP_NE: | |
626 | { | |
02aca193 | 627 | ret = bin_op_compare_check(stack, opcode, "!="); |
3834b99f | 628 | if (ret < 0) |
07dfc1d0 MD |
629 | goto end; |
630 | break; | |
631 | } | |
632 | case FILTER_OP_GT: | |
633 | { | |
02aca193 | 634 | ret = bin_op_compare_check(stack, opcode, ">"); |
3834b99f | 635 | if (ret < 0) |
07dfc1d0 MD |
636 | goto end; |
637 | break; | |
638 | } | |
639 | case FILTER_OP_LT: | |
640 | { | |
02aca193 | 641 | ret = bin_op_compare_check(stack, opcode, "<"); |
3834b99f | 642 | if (ret < 0) |
07dfc1d0 MD |
643 | goto end; |
644 | break; | |
645 | } | |
646 | case FILTER_OP_GE: | |
647 | { | |
02aca193 | 648 | ret = bin_op_compare_check(stack, opcode, ">="); |
3834b99f | 649 | if (ret < 0) |
07dfc1d0 MD |
650 | goto end; |
651 | break; | |
652 | } | |
653 | case FILTER_OP_LE: | |
654 | { | |
02aca193 | 655 | ret = bin_op_compare_check(stack, opcode, "<="); |
3834b99f | 656 | if (ret < 0) |
07dfc1d0 MD |
657 | goto end; |
658 | break; | |
659 | } | |
660 | ||
661 | case FILTER_OP_EQ_STRING: | |
662 | case FILTER_OP_NE_STRING: | |
663 | case FILTER_OP_GT_STRING: | |
664 | case FILTER_OP_LT_STRING: | |
665 | case FILTER_OP_GE_STRING: | |
666 | case FILTER_OP_LE_STRING: | |
667 | { | |
668 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
669 | printk(KERN_WARNING "Empty stack\n"); | |
670 | ret = -EINVAL; | |
671 | goto end; | |
672 | } | |
673 | if (vstack_ax(stack)->type != REG_STRING | |
674 | || vstack_bx(stack)->type != REG_STRING) { | |
675 | printk(KERN_WARNING "Unexpected register type for string comparator\n"); | |
676 | ret = -EINVAL; | |
677 | goto end; | |
678 | } | |
679 | break; | |
680 | } | |
681 | ||
02aca193 PP |
682 | |
683 | case FILTER_OP_EQ_STAR_GLOB_STRING: | |
684 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
685 | { | |
686 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
687 | printk(KERN_WARNING "Empty stack\n"); | |
688 | ret = -EINVAL; | |
689 | goto end; | |
690 | } | |
691 | if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING | |
692 | && vstack_bx(stack)->type != REG_STAR_GLOB_STRING) { | |
693 | printk(KERN_WARNING "Unexpected register type for globbing pattern comparator\n"); | |
694 | ret = -EINVAL; | |
695 | goto end; | |
696 | } | |
697 | break; | |
698 | } | |
699 | ||
07dfc1d0 MD |
700 | case FILTER_OP_EQ_S64: |
701 | case FILTER_OP_NE_S64: | |
702 | case FILTER_OP_GT_S64: | |
703 | case FILTER_OP_LT_S64: | |
704 | case FILTER_OP_GE_S64: | |
705 | case FILTER_OP_LE_S64: | |
706 | { | |
707 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
708 | printk(KERN_WARNING "Empty stack\n"); | |
709 | ret = -EINVAL; | |
710 | goto end; | |
711 | } | |
712 | if (vstack_ax(stack)->type != REG_S64 | |
713 | || vstack_bx(stack)->type != REG_S64) { | |
714 | printk(KERN_WARNING "Unexpected register type for s64 comparator\n"); | |
715 | ret = -EINVAL; | |
716 | goto end; | |
717 | } | |
718 | break; | |
719 | } | |
720 | ||
e16c054b MD |
721 | case FILTER_OP_BIT_RSHIFT: |
722 | ret = bin_op_bitwise_check(stack, opcode, ">>"); | |
723 | if (ret < 0) | |
724 | goto end; | |
725 | break; | |
726 | case FILTER_OP_BIT_LSHIFT: | |
727 | ret = bin_op_bitwise_check(stack, opcode, "<<"); | |
728 | if (ret < 0) | |
729 | goto end; | |
730 | break; | |
3834b99f MD |
731 | case FILTER_OP_BIT_AND: |
732 | ret = bin_op_bitwise_check(stack, opcode, "&"); | |
733 | if (ret < 0) | |
734 | goto end; | |
735 | break; | |
736 | case FILTER_OP_BIT_OR: | |
737 | ret = bin_op_bitwise_check(stack, opcode, "|"); | |
738 | if (ret < 0) | |
739 | goto end; | |
740 | break; | |
741 | case FILTER_OP_BIT_XOR: | |
742 | ret = bin_op_bitwise_check(stack, opcode, "^"); | |
743 | if (ret < 0) | |
744 | goto end; | |
745 | break; | |
746 | ||
07dfc1d0 MD |
747 | /* unary */ |
748 | case FILTER_OP_UNARY_PLUS: | |
749 | case FILTER_OP_UNARY_MINUS: | |
750 | case FILTER_OP_UNARY_NOT: | |
751 | { | |
752 | if (!vstack_ax(stack)) { | |
753 | printk(KERN_WARNING "Empty stack\n"); | |
754 | ret = -EINVAL; | |
755 | goto end; | |
756 | } | |
757 | switch (vstack_ax(stack)->type) { | |
758 | default: | |
759 | case REG_DOUBLE: | |
760 | printk(KERN_WARNING "unknown register type\n"); | |
761 | ret = -EINVAL; | |
762 | goto end; | |
763 | ||
764 | case REG_STRING: | |
02aca193 | 765 | case REG_STAR_GLOB_STRING: |
07dfc1d0 MD |
766 | printk(KERN_WARNING "Unary op can only be applied to numeric or floating point registers\n"); |
767 | ret = -EINVAL; | |
768 | goto end; | |
769 | case REG_S64: | |
3834b99f | 770 | case REG_TYPE_UNKNOWN: |
07dfc1d0 MD |
771 | break; |
772 | } | |
773 | break; | |
774 | } | |
e16c054b MD |
775 | case FILTER_OP_UNARY_BIT_NOT: |
776 | { | |
777 | if (!vstack_ax(stack)) { | |
778 | printk(KERN_WARNING "Empty stack\n"); | |
779 | ret = -EINVAL; | |
780 | goto end; | |
781 | } | |
782 | switch (vstack_ax(stack)->type) { | |
783 | default: | |
784 | printk(KERN_WARNING "unknown register type\n"); | |
785 | ret = -EINVAL; | |
786 | goto end; | |
787 | ||
788 | case REG_STRING: | |
789 | case REG_STAR_GLOB_STRING: | |
790 | case REG_DOUBLE: | |
791 | printk(KERN_WARNING "Unary bitwise op can only be applied to numeric registers\n"); | |
792 | ret = -EINVAL; | |
793 | goto end; | |
794 | case REG_S64: | |
795 | break; | |
796 | case REG_TYPE_UNKNOWN: | |
797 | break; | |
798 | } | |
799 | break; | |
800 | } | |
07dfc1d0 MD |
801 | |
802 | case FILTER_OP_UNARY_PLUS_S64: | |
803 | case FILTER_OP_UNARY_MINUS_S64: | |
804 | case FILTER_OP_UNARY_NOT_S64: | |
805 | { | |
806 | if (!vstack_ax(stack)) { | |
807 | printk(KERN_WARNING "Empty stack\n"); | |
808 | ret = -EINVAL; | |
809 | goto end; | |
810 | } | |
811 | if (vstack_ax(stack)->type != REG_S64) { | |
812 | printk(KERN_WARNING "Invalid register type\n"); | |
813 | ret = -EINVAL; | |
814 | goto end; | |
815 | } | |
816 | break; | |
817 | } | |
818 | ||
819 | /* logical */ | |
820 | case FILTER_OP_AND: | |
821 | case FILTER_OP_OR: | |
822 | { | |
823 | struct logical_op *insn = (struct logical_op *) pc; | |
824 | ||
825 | if (!vstack_ax(stack)) { | |
826 | printk(KERN_WARNING "Empty stack\n"); | |
827 | ret = -EINVAL; | |
828 | goto end; | |
829 | } | |
830 | if (vstack_ax(stack)->type != REG_S64) { | |
831 | printk(KERN_WARNING "Logical comparator expects S64 register\n"); | |
832 | ret = -EINVAL; | |
833 | goto end; | |
834 | } | |
835 | ||
836 | dbg_printk("Validate jumping to bytecode offset %u\n", | |
837 | (unsigned int) insn->skip_offset); | |
838 | if (unlikely(start_pc + insn->skip_offset <= pc)) { | |
839 | printk(KERN_WARNING "Loops are not allowed in bytecode\n"); | |
840 | ret = -EINVAL; | |
841 | goto end; | |
842 | } | |
843 | break; | |
844 | } | |
845 | ||
846 | /* load field ref */ | |
847 | case FILTER_OP_LOAD_FIELD_REF: | |
848 | { | |
849 | printk(KERN_WARNING "Unknown field ref type\n"); | |
850 | ret = -EINVAL; | |
851 | goto end; | |
852 | } | |
853 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
854 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
f127e61e MD |
855 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
856 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
857 | { |
858 | struct load_op *insn = (struct load_op *) pc; | |
859 | struct field_ref *ref = (struct field_ref *) insn->data; | |
860 | ||
861 | dbg_printk("Validate load field ref offset %u type string\n", | |
862 | ref->offset); | |
863 | break; | |
864 | } | |
865 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
866 | { | |
867 | struct load_op *insn = (struct load_op *) pc; | |
868 | struct field_ref *ref = (struct field_ref *) insn->data; | |
869 | ||
870 | dbg_printk("Validate load field ref offset %u type s64\n", | |
871 | ref->offset); | |
872 | break; | |
873 | } | |
874 | ||
875 | /* load from immediate operand */ | |
876 | case FILTER_OP_LOAD_STRING: | |
02aca193 | 877 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
07dfc1d0 MD |
878 | { |
879 | break; | |
880 | } | |
881 | ||
882 | case FILTER_OP_LOAD_S64: | |
883 | { | |
884 | break; | |
885 | } | |
886 | ||
887 | case FILTER_OP_CAST_TO_S64: | |
888 | { | |
889 | struct cast_op *insn = (struct cast_op *) pc; | |
890 | ||
891 | if (!vstack_ax(stack)) { | |
892 | printk(KERN_WARNING "Empty stack\n"); | |
893 | ret = -EINVAL; | |
894 | goto end; | |
895 | } | |
896 | switch (vstack_ax(stack)->type) { | |
897 | default: | |
898 | case REG_DOUBLE: | |
899 | printk(KERN_WARNING "unknown register type\n"); | |
900 | ret = -EINVAL; | |
901 | goto end; | |
902 | ||
903 | case REG_STRING: | |
02aca193 | 904 | case REG_STAR_GLOB_STRING: |
07dfc1d0 MD |
905 | printk(KERN_WARNING "Cast op can only be applied to numeric or floating point registers\n"); |
906 | ret = -EINVAL; | |
907 | goto end; | |
908 | case REG_S64: | |
909 | break; | |
910 | } | |
911 | if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) { | |
912 | if (vstack_ax(stack)->type != REG_DOUBLE) { | |
913 | printk(KERN_WARNING "Cast expects double\n"); | |
914 | ret = -EINVAL; | |
915 | goto end; | |
916 | } | |
917 | } | |
918 | break; | |
919 | } | |
920 | case FILTER_OP_CAST_NOP: | |
921 | { | |
922 | break; | |
923 | } | |
924 | ||
925 | /* get context ref */ | |
926 | case FILTER_OP_GET_CONTEXT_REF: | |
927 | { | |
928 | printk(KERN_WARNING "Unknown get context ref type\n"); | |
929 | ret = -EINVAL; | |
930 | goto end; | |
931 | } | |
932 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
933 | { | |
934 | struct load_op *insn = (struct load_op *) pc; | |
935 | struct field_ref *ref = (struct field_ref *) insn->data; | |
936 | ||
937 | dbg_printk("Validate get context ref offset %u type string\n", | |
938 | ref->offset); | |
939 | break; | |
940 | } | |
941 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
942 | { | |
943 | struct load_op *insn = (struct load_op *) pc; | |
944 | struct field_ref *ref = (struct field_ref *) insn->data; | |
945 | ||
946 | dbg_printk("Validate get context ref offset %u type s64\n", | |
947 | ref->offset); | |
948 | break; | |
949 | } | |
950 | ||
3834b99f MD |
951 | /* |
952 | * Instructions for recursive traversal through composed types. | |
953 | */ | |
954 | case FILTER_OP_GET_CONTEXT_ROOT: | |
955 | { | |
956 | dbg_printk("Validate get context root\n"); | |
957 | break; | |
958 | } | |
959 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
960 | { | |
961 | dbg_printk("Validate get app context root\n"); | |
962 | break; | |
963 | } | |
964 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
965 | { | |
966 | dbg_printk("Validate get payload root\n"); | |
967 | break; | |
968 | } | |
969 | case FILTER_OP_LOAD_FIELD: | |
970 | { | |
971 | /* | |
972 | * We tolerate that field type is unknown at validation, | |
973 | * because we are performing the load specialization in | |
974 | * a phase after validation. | |
975 | */ | |
976 | dbg_printk("Validate load field\n"); | |
977 | break; | |
978 | } | |
979 | case FILTER_OP_LOAD_FIELD_S8: | |
980 | { | |
981 | dbg_printk("Validate load field s8\n"); | |
982 | break; | |
983 | } | |
984 | case FILTER_OP_LOAD_FIELD_S16: | |
985 | { | |
986 | dbg_printk("Validate load field s16\n"); | |
987 | break; | |
988 | } | |
989 | case FILTER_OP_LOAD_FIELD_S32: | |
990 | { | |
991 | dbg_printk("Validate load field s32\n"); | |
992 | break; | |
993 | } | |
994 | case FILTER_OP_LOAD_FIELD_S64: | |
995 | { | |
996 | dbg_printk("Validate load field s64\n"); | |
997 | break; | |
998 | } | |
999 | case FILTER_OP_LOAD_FIELD_U8: | |
1000 | { | |
1001 | dbg_printk("Validate load field u8\n"); | |
1002 | break; | |
1003 | } | |
1004 | case FILTER_OP_LOAD_FIELD_U16: | |
1005 | { | |
1006 | dbg_printk("Validate load field u16\n"); | |
1007 | break; | |
1008 | } | |
1009 | case FILTER_OP_LOAD_FIELD_U32: | |
1010 | { | |
1011 | dbg_printk("Validate load field u32\n"); | |
1012 | break; | |
1013 | } | |
1014 | case FILTER_OP_LOAD_FIELD_U64: | |
1015 | { | |
1016 | dbg_printk("Validate load field u64\n"); | |
1017 | break; | |
1018 | } | |
1019 | case FILTER_OP_LOAD_FIELD_STRING: | |
1020 | { | |
1021 | dbg_printk("Validate load field string\n"); | |
1022 | break; | |
1023 | } | |
1024 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
1025 | { | |
1026 | dbg_printk("Validate load field sequence\n"); | |
1027 | break; | |
1028 | } | |
1029 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
1030 | { | |
1031 | dbg_printk("Validate load field double\n"); | |
1032 | break; | |
1033 | } | |
1034 | ||
1035 | case FILTER_OP_GET_SYMBOL: | |
1036 | { | |
1037 | struct load_op *insn = (struct load_op *) pc; | |
1038 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1039 | ||
1040 | dbg_printk("Validate get symbol offset %u\n", sym->offset); | |
1041 | break; | |
1042 | } | |
1043 | ||
1044 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1045 | { | |
1046 | struct load_op *insn = (struct load_op *) pc; | |
1047 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1048 | ||
1049 | dbg_printk("Validate get symbol field offset %u\n", sym->offset); | |
1050 | break; | |
1051 | } | |
1052 | ||
1053 | case FILTER_OP_GET_INDEX_U16: | |
1054 | { | |
1055 | struct load_op *insn = (struct load_op *) pc; | |
1056 | struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data; | |
1057 | ||
1058 | dbg_printk("Validate get index u16 index %u\n", get_index->index); | |
1059 | break; | |
1060 | } | |
1061 | ||
1062 | case FILTER_OP_GET_INDEX_U64: | |
1063 | { | |
1064 | struct load_op *insn = (struct load_op *) pc; | |
1065 | struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data; | |
1066 | ||
1067 | dbg_printk("Validate get index u64 index %llu\n", | |
1068 | (unsigned long long) get_index->index); | |
1069 | break; | |
1070 | } | |
07dfc1d0 MD |
1071 | } |
1072 | end: | |
1073 | return ret; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * Return value: | |
1078 | * 0: success | |
1079 | * <0: error | |
1080 | */ | |
1081 | static | |
1082 | int validate_instruction_all_contexts(struct bytecode_runtime *bytecode, | |
1083 | struct mp_table *mp_table, | |
1084 | struct vstack *stack, | |
7962cb86 MD |
1085 | char *start_pc, |
1086 | char *pc) | |
07dfc1d0 MD |
1087 | { |
1088 | int ret, found = 0; | |
1089 | unsigned long target_pc = pc - start_pc; | |
1090 | unsigned long hash; | |
1091 | struct hlist_head *head; | |
1092 | struct mp_node *mp_node; | |
1093 | ||
1094 | /* Validate the context resulting from the previous instruction */ | |
1095 | ret = validate_instruction_context(bytecode, stack, start_pc, pc); | |
3834b99f | 1096 | if (ret < 0) |
07dfc1d0 MD |
1097 | return ret; |
1098 | ||
1099 | /* Validate merge points */ | |
1100 | hash = jhash_1word(target_pc, 0); | |
1101 | head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)]; | |
d216ecae | 1102 | lttng_hlist_for_each_entry(mp_node, head, node) { |
07dfc1d0 MD |
1103 | if (lttng_hash_match(mp_node, target_pc)) { |
1104 | found = 1; | |
1105 | break; | |
1106 | } | |
1107 | } | |
1108 | if (found) { | |
1109 | dbg_printk("Filter: validate merge point at offset %lu\n", | |
1110 | target_pc); | |
1111 | if (merge_points_compare(stack, &mp_node->stack)) { | |
1112 | printk(KERN_WARNING "Merge points differ for offset %lu\n", | |
1113 | target_pc); | |
1114 | return -EINVAL; | |
1115 | } | |
1116 | /* Once validated, we can remove the merge point */ | |
1117 | dbg_printk("Filter: remove merge point at offset %lu\n", | |
1118 | target_pc); | |
1119 | hlist_del(&mp_node->node); | |
1120 | } | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Return value: | |
1126 | * >0: going to next insn. | |
1127 | * 0: success, stop iteration. | |
1128 | * <0: error | |
1129 | */ | |
1130 | static | |
1131 | int exec_insn(struct bytecode_runtime *bytecode, | |
1132 | struct mp_table *mp_table, | |
1133 | struct vstack *stack, | |
7962cb86 MD |
1134 | char **_next_pc, |
1135 | char *pc) | |
07dfc1d0 MD |
1136 | { |
1137 | int ret = 1; | |
7962cb86 | 1138 | char *next_pc = *_next_pc; |
07dfc1d0 MD |
1139 | |
1140 | switch (*(filter_opcode_t *) pc) { | |
1141 | case FILTER_OP_UNKNOWN: | |
1142 | default: | |
1143 | { | |
1144 | printk(KERN_WARNING "unknown bytecode op %u\n", | |
1145 | (unsigned int) *(filter_opcode_t *) pc); | |
1146 | ret = -EINVAL; | |
1147 | goto end; | |
1148 | } | |
1149 | ||
1150 | case FILTER_OP_RETURN: | |
1151 | { | |
1152 | if (!vstack_ax(stack)) { | |
1153 | printk(KERN_WARNING "Empty stack\n"); | |
1154 | ret = -EINVAL; | |
1155 | goto end; | |
1156 | } | |
3834b99f MD |
1157 | switch (vstack_ax(stack)->type) { |
1158 | case REG_S64: | |
1159 | case REG_TYPE_UNKNOWN: | |
1160 | break; | |
1161 | default: | |
1162 | printk(KERN_WARNING "Unexpected register type %d at end of bytecode\n", | |
1163 | (int) vstack_ax(stack)->type); | |
1164 | ret = -EINVAL; | |
1165 | goto end; | |
1166 | } | |
1167 | ||
07dfc1d0 MD |
1168 | ret = 0; |
1169 | goto end; | |
1170 | } | |
1171 | ||
57ba4b41 MD |
1172 | case FILTER_OP_RETURN_S64: |
1173 | { | |
1174 | if (!vstack_ax(stack)) { | |
1175 | printk(KERN_WARNING "Empty stack\n"); | |
1176 | ret = -EINVAL; | |
1177 | goto end; | |
1178 | } | |
1179 | switch (vstack_ax(stack)->type) { | |
1180 | case REG_S64: | |
1181 | break; | |
1182 | default: | |
1183 | case REG_TYPE_UNKNOWN: | |
1184 | printk(KERN_WARNING "Unexpected register type %d at end of bytecode\n", | |
1185 | (int) vstack_ax(stack)->type); | |
1186 | ret = -EINVAL; | |
1187 | goto end; | |
1188 | } | |
1189 | ||
1190 | ret = 0; | |
1191 | goto end; | |
1192 | } | |
1193 | ||
07dfc1d0 MD |
1194 | /* binary */ |
1195 | case FILTER_OP_MUL: | |
1196 | case FILTER_OP_DIV: | |
1197 | case FILTER_OP_MOD: | |
1198 | case FILTER_OP_PLUS: | |
1199 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
1200 | /* Floating point */ |
1201 | case FILTER_OP_EQ_DOUBLE: | |
1202 | case FILTER_OP_NE_DOUBLE: | |
1203 | case FILTER_OP_GT_DOUBLE: | |
1204 | case FILTER_OP_LT_DOUBLE: | |
1205 | case FILTER_OP_GE_DOUBLE: | |
1206 | case FILTER_OP_LE_DOUBLE: | |
1207 | case FILTER_OP_EQ_DOUBLE_S64: | |
1208 | case FILTER_OP_NE_DOUBLE_S64: | |
1209 | case FILTER_OP_GT_DOUBLE_S64: | |
1210 | case FILTER_OP_LT_DOUBLE_S64: | |
1211 | case FILTER_OP_GE_DOUBLE_S64: | |
1212 | case FILTER_OP_LE_DOUBLE_S64: | |
1213 | case FILTER_OP_EQ_S64_DOUBLE: | |
1214 | case FILTER_OP_NE_S64_DOUBLE: | |
1215 | case FILTER_OP_GT_S64_DOUBLE: | |
1216 | case FILTER_OP_LT_S64_DOUBLE: | |
1217 | case FILTER_OP_GE_S64_DOUBLE: | |
1218 | case FILTER_OP_LE_S64_DOUBLE: | |
1219 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
1220 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
1221 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
1222 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
1223 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
1224 | case FILTER_OP_LOAD_DOUBLE: | |
1225 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
1226 | { | |
1227 | printk(KERN_WARNING "unsupported bytecode op %u\n", | |
1228 | (unsigned int) *(filter_opcode_t *) pc); | |
1229 | ret = -EINVAL; | |
1230 | goto end; | |
1231 | } | |
1232 | ||
1233 | case FILTER_OP_EQ: | |
1234 | case FILTER_OP_NE: | |
1235 | case FILTER_OP_GT: | |
1236 | case FILTER_OP_LT: | |
1237 | case FILTER_OP_GE: | |
1238 | case FILTER_OP_LE: | |
1239 | case FILTER_OP_EQ_STRING: | |
1240 | case FILTER_OP_NE_STRING: | |
1241 | case FILTER_OP_GT_STRING: | |
1242 | case FILTER_OP_LT_STRING: | |
1243 | case FILTER_OP_GE_STRING: | |
1244 | case FILTER_OP_LE_STRING: | |
02aca193 PP |
1245 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
1246 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
07dfc1d0 MD |
1247 | case FILTER_OP_EQ_S64: |
1248 | case FILTER_OP_NE_S64: | |
1249 | case FILTER_OP_GT_S64: | |
1250 | case FILTER_OP_LT_S64: | |
1251 | case FILTER_OP_GE_S64: | |
1252 | case FILTER_OP_LE_S64: | |
e16c054b MD |
1253 | case FILTER_OP_BIT_RSHIFT: |
1254 | case FILTER_OP_BIT_LSHIFT: | |
3834b99f MD |
1255 | case FILTER_OP_BIT_AND: |
1256 | case FILTER_OP_BIT_OR: | |
1257 | case FILTER_OP_BIT_XOR: | |
07dfc1d0 MD |
1258 | { |
1259 | /* Pop 2, push 1 */ | |
1260 | if (vstack_pop(stack)) { | |
1261 | ret = -EINVAL; | |
1262 | goto end; | |
1263 | } | |
1264 | if (!vstack_ax(stack)) { | |
1265 | printk(KERN_WARNING "Empty stack\n"); | |
1266 | ret = -EINVAL; | |
1267 | goto end; | |
1268 | } | |
3834b99f MD |
1269 | switch (vstack_ax(stack)->type) { |
1270 | case REG_S64: | |
1271 | case REG_DOUBLE: | |
1272 | case REG_STRING: | |
1273 | case REG_STAR_GLOB_STRING: | |
1274 | case REG_TYPE_UNKNOWN: | |
1275 | break; | |
1276 | default: | |
1277 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
1278 | (int) vstack_ax(stack)->type); | |
1279 | ret = -EINVAL; | |
1280 | goto end; | |
1281 | } | |
1282 | ||
07dfc1d0 MD |
1283 | vstack_ax(stack)->type = REG_S64; |
1284 | next_pc += sizeof(struct binary_op); | |
1285 | break; | |
1286 | } | |
1287 | ||
1288 | /* unary */ | |
1289 | case FILTER_OP_UNARY_PLUS: | |
1290 | case FILTER_OP_UNARY_MINUS: | |
3834b99f MD |
1291 | { |
1292 | /* Pop 1, push 1 */ | |
1293 | if (!vstack_ax(stack)) { | |
1294 | printk(KERN_WARNING "Empty stack\n\n"); | |
1295 | ret = -EINVAL; | |
1296 | goto end; | |
1297 | } | |
1298 | switch (vstack_ax(stack)->type) { | |
1299 | case REG_S64: | |
1300 | case REG_TYPE_UNKNOWN: | |
1301 | break; | |
1302 | default: | |
1303 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
1304 | (int) vstack_ax(stack)->type); | |
1305 | ret = -EINVAL; | |
1306 | goto end; | |
1307 | } | |
1308 | ||
1309 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; | |
1310 | next_pc += sizeof(struct unary_op); | |
1311 | break; | |
1312 | } | |
1313 | ||
07dfc1d0 MD |
1314 | case FILTER_OP_UNARY_PLUS_S64: |
1315 | case FILTER_OP_UNARY_MINUS_S64: | |
1316 | case FILTER_OP_UNARY_NOT_S64: | |
1317 | { | |
1318 | /* Pop 1, push 1 */ | |
1319 | if (!vstack_ax(stack)) { | |
3834b99f MD |
1320 | printk(KERN_WARNING "Empty stack\n\n"); |
1321 | ret = -EINVAL; | |
1322 | goto end; | |
1323 | } | |
1324 | switch (vstack_ax(stack)->type) { | |
1325 | case REG_S64: | |
1326 | break; | |
1327 | default: | |
1328 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
1329 | (int) vstack_ax(stack)->type); | |
1330 | ret = -EINVAL; | |
1331 | goto end; | |
1332 | } | |
1333 | ||
1334 | vstack_ax(stack)->type = REG_S64; | |
1335 | next_pc += sizeof(struct unary_op); | |
1336 | break; | |
1337 | } | |
1338 | ||
1339 | case FILTER_OP_UNARY_NOT: | |
1340 | { | |
1341 | /* Pop 1, push 1 */ | |
1342 | if (!vstack_ax(stack)) { | |
1343 | printk(KERN_WARNING "Empty stack\n\n"); | |
1344 | ret = -EINVAL; | |
1345 | goto end; | |
1346 | } | |
1347 | switch (vstack_ax(stack)->type) { | |
1348 | case REG_S64: | |
1349 | case REG_TYPE_UNKNOWN: | |
1350 | break; | |
1351 | default: | |
1352 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
e16c054b MD |
1353 | (int) vstack_ax(stack)->type); |
1354 | ret = -EINVAL; | |
1355 | goto end; | |
1356 | } | |
1357 | ||
1358 | vstack_ax(stack)->type = REG_S64; | |
1359 | next_pc += sizeof(struct unary_op); | |
1360 | break; | |
1361 | } | |
1362 | ||
1363 | case FILTER_OP_UNARY_BIT_NOT: | |
1364 | { | |
1365 | /* Pop 1, push 1 */ | |
1366 | if (!vstack_ax(stack)) { | |
1367 | printk(KERN_WARNING "Empty stack\n"); | |
1368 | ret = -EINVAL; | |
1369 | goto end; | |
1370 | } | |
1371 | switch (vstack_ax(stack)->type) { | |
1372 | case REG_S64: | |
1373 | case REG_TYPE_UNKNOWN: | |
1374 | break; | |
1375 | case REG_DOUBLE: | |
1376 | default: | |
1377 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
3834b99f | 1378 | (int) vstack_ax(stack)->type); |
07dfc1d0 MD |
1379 | ret = -EINVAL; |
1380 | goto end; | |
1381 | } | |
3834b99f | 1382 | |
07dfc1d0 MD |
1383 | vstack_ax(stack)->type = REG_S64; |
1384 | next_pc += sizeof(struct unary_op); | |
1385 | break; | |
1386 | } | |
1387 | ||
1388 | /* logical */ | |
1389 | case FILTER_OP_AND: | |
1390 | case FILTER_OP_OR: | |
1391 | { | |
1392 | struct logical_op *insn = (struct logical_op *) pc; | |
1393 | int merge_ret; | |
1394 | ||
1395 | /* Add merge point to table */ | |
1396 | merge_ret = merge_point_add_check(mp_table, | |
1397 | insn->skip_offset, stack); | |
1398 | if (merge_ret) { | |
1399 | ret = merge_ret; | |
1400 | goto end; | |
1401 | } | |
3834b99f MD |
1402 | |
1403 | if (!vstack_ax(stack)) { | |
1404 | printk(KERN_WARNING "Empty stack\n\n"); | |
1405 | ret = -EINVAL; | |
1406 | goto end; | |
1407 | } | |
1408 | /* There is always a cast-to-s64 operation before a or/and op. */ | |
1409 | switch (vstack_ax(stack)->type) { | |
1410 | case REG_S64: | |
1411 | break; | |
1412 | default: | |
1413 | printk(KERN_WARNING "Incorrect register type %d for operation\n", | |
1414 | (int) vstack_ax(stack)->type); | |
1415 | ret = -EINVAL; | |
1416 | goto end; | |
1417 | } | |
1418 | ||
07dfc1d0 MD |
1419 | /* Continue to next instruction */ |
1420 | /* Pop 1 when jump not taken */ | |
1421 | if (vstack_pop(stack)) { | |
1422 | ret = -EINVAL; | |
1423 | goto end; | |
1424 | } | |
1425 | next_pc += sizeof(struct logical_op); | |
1426 | break; | |
1427 | } | |
1428 | ||
1429 | /* load field ref */ | |
1430 | case FILTER_OP_LOAD_FIELD_REF: | |
1431 | { | |
1432 | printk(KERN_WARNING "Unknown field ref type\n"); | |
1433 | ret = -EINVAL; | |
1434 | goto end; | |
1435 | } | |
1436 | /* get context ref */ | |
1437 | case FILTER_OP_GET_CONTEXT_REF: | |
1438 | { | |
1439 | printk(KERN_WARNING "Unknown get context ref type\n"); | |
1440 | ret = -EINVAL; | |
1441 | goto end; | |
1442 | } | |
1443 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
1444 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
1445 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
f127e61e MD |
1446 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
1447 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
1448 | { |
1449 | if (vstack_push(stack)) { | |
1450 | ret = -EINVAL; | |
1451 | goto end; | |
1452 | } | |
1453 | vstack_ax(stack)->type = REG_STRING; | |
1454 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1455 | break; | |
1456 | } | |
1457 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
1458 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
1459 | { | |
1460 | if (vstack_push(stack)) { | |
1461 | ret = -EINVAL; | |
1462 | goto end; | |
1463 | } | |
1464 | vstack_ax(stack)->type = REG_S64; | |
1465 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1466 | break; | |
1467 | } | |
1468 | ||
1469 | /* load from immediate operand */ | |
1470 | case FILTER_OP_LOAD_STRING: | |
1471 | { | |
1472 | struct load_op *insn = (struct load_op *) pc; | |
1473 | ||
1474 | if (vstack_push(stack)) { | |
1475 | ret = -EINVAL; | |
1476 | goto end; | |
1477 | } | |
1478 | vstack_ax(stack)->type = REG_STRING; | |
1479 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
02aca193 PP |
1480 | break; |
1481 | } | |
1482 | ||
1483 | case FILTER_OP_LOAD_STAR_GLOB_STRING: | |
1484 | { | |
1485 | struct load_op *insn = (struct load_op *) pc; | |
1486 | ||
1487 | if (vstack_push(stack)) { | |
1488 | ret = -EINVAL; | |
1489 | goto end; | |
1490 | } | |
1491 | vstack_ax(stack)->type = REG_STAR_GLOB_STRING; | |
1492 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
07dfc1d0 MD |
1493 | break; |
1494 | } | |
1495 | ||
1496 | case FILTER_OP_LOAD_S64: | |
1497 | { | |
1498 | if (vstack_push(stack)) { | |
1499 | ret = -EINVAL; | |
1500 | goto end; | |
1501 | } | |
1502 | vstack_ax(stack)->type = REG_S64; | |
1503 | next_pc += sizeof(struct load_op) | |
1504 | + sizeof(struct literal_numeric); | |
1505 | break; | |
1506 | } | |
1507 | ||
1508 | case FILTER_OP_CAST_TO_S64: | |
1509 | { | |
1510 | /* Pop 1, push 1 */ | |
1511 | if (!vstack_ax(stack)) { | |
1512 | printk(KERN_WARNING "Empty stack\n"); | |
1513 | ret = -EINVAL; | |
1514 | goto end; | |
1515 | } | |
3834b99f MD |
1516 | switch (vstack_ax(stack)->type) { |
1517 | case REG_S64: | |
1518 | case REG_DOUBLE: | |
1519 | case REG_TYPE_UNKNOWN: | |
1520 | break; | |
1521 | default: | |
1522 | printk(KERN_WARNING "Incorrect register type %d for cast\n", | |
1523 | (int) vstack_ax(stack)->type); | |
1524 | ret = -EINVAL; | |
1525 | goto end; | |
1526 | } | |
07dfc1d0 MD |
1527 | vstack_ax(stack)->type = REG_S64; |
1528 | next_pc += sizeof(struct cast_op); | |
1529 | break; | |
1530 | } | |
1531 | case FILTER_OP_CAST_NOP: | |
1532 | { | |
1533 | next_pc += sizeof(struct cast_op); | |
1534 | break; | |
1535 | } | |
1536 | ||
3834b99f MD |
1537 | /* |
1538 | * Instructions for recursive traversal through composed types. | |
1539 | */ | |
1540 | case FILTER_OP_GET_CONTEXT_ROOT: | |
1541 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
1542 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
1543 | { | |
1544 | if (vstack_push(stack)) { | |
1545 | ret = -EINVAL; | |
1546 | goto end; | |
1547 | } | |
1548 | vstack_ax(stack)->type = REG_PTR; | |
1549 | next_pc += sizeof(struct load_op); | |
1550 | break; | |
1551 | } | |
1552 | ||
1553 | case FILTER_OP_LOAD_FIELD: | |
1554 | { | |
1555 | /* Pop 1, push 1 */ | |
1556 | if (!vstack_ax(stack)) { | |
1557 | printk(KERN_WARNING "Empty stack\n\n"); | |
1558 | ret = -EINVAL; | |
1559 | goto end; | |
1560 | } | |
1561 | if (vstack_ax(stack)->type != REG_PTR) { | |
1562 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1563 | ret = -EINVAL; | |
1564 | goto end; | |
1565 | } | |
1566 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; | |
1567 | next_pc += sizeof(struct load_op); | |
1568 | break; | |
1569 | } | |
1570 | ||
1571 | case FILTER_OP_LOAD_FIELD_S8: | |
1572 | case FILTER_OP_LOAD_FIELD_S16: | |
1573 | case FILTER_OP_LOAD_FIELD_S32: | |
1574 | case FILTER_OP_LOAD_FIELD_S64: | |
1575 | case FILTER_OP_LOAD_FIELD_U8: | |
1576 | case FILTER_OP_LOAD_FIELD_U16: | |
1577 | case FILTER_OP_LOAD_FIELD_U32: | |
1578 | case FILTER_OP_LOAD_FIELD_U64: | |
1579 | { | |
1580 | /* Pop 1, push 1 */ | |
1581 | if (!vstack_ax(stack)) { | |
1582 | printk(KERN_WARNING "Empty stack\n\n"); | |
1583 | ret = -EINVAL; | |
1584 | goto end; | |
1585 | } | |
1586 | if (vstack_ax(stack)->type != REG_PTR) { | |
1587 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1588 | ret = -EINVAL; | |
1589 | goto end; | |
1590 | } | |
1591 | vstack_ax(stack)->type = REG_S64; | |
1592 | next_pc += sizeof(struct load_op); | |
1593 | break; | |
1594 | } | |
1595 | ||
1596 | case FILTER_OP_LOAD_FIELD_STRING: | |
1597 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
1598 | { | |
1599 | /* Pop 1, push 1 */ | |
1600 | if (!vstack_ax(stack)) { | |
1601 | printk(KERN_WARNING "Empty stack\n\n"); | |
1602 | ret = -EINVAL; | |
1603 | goto end; | |
1604 | } | |
1605 | if (vstack_ax(stack)->type != REG_PTR) { | |
1606 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1607 | ret = -EINVAL; | |
1608 | goto end; | |
1609 | } | |
1610 | vstack_ax(stack)->type = REG_STRING; | |
1611 | next_pc += sizeof(struct load_op); | |
1612 | break; | |
1613 | } | |
1614 | ||
1615 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
1616 | { | |
1617 | /* Pop 1, push 1 */ | |
1618 | if (!vstack_ax(stack)) { | |
1619 | printk(KERN_WARNING "Empty stack\n\n"); | |
1620 | ret = -EINVAL; | |
1621 | goto end; | |
1622 | } | |
1623 | if (vstack_ax(stack)->type != REG_PTR) { | |
1624 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1625 | ret = -EINVAL; | |
1626 | goto end; | |
1627 | } | |
1628 | vstack_ax(stack)->type = REG_DOUBLE; | |
1629 | next_pc += sizeof(struct load_op); | |
1630 | break; | |
1631 | } | |
1632 | ||
1633 | case FILTER_OP_GET_SYMBOL: | |
1634 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1635 | { | |
1636 | /* Pop 1, push 1 */ | |
1637 | if (!vstack_ax(stack)) { | |
1638 | printk(KERN_WARNING "Empty stack\n\n"); | |
1639 | ret = -EINVAL; | |
1640 | goto end; | |
1641 | } | |
1642 | if (vstack_ax(stack)->type != REG_PTR) { | |
1643 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1644 | ret = -EINVAL; | |
1645 | goto end; | |
1646 | } | |
1647 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); | |
1648 | break; | |
1649 | } | |
1650 | ||
1651 | case FILTER_OP_GET_INDEX_U16: | |
1652 | { | |
1653 | /* Pop 1, push 1 */ | |
1654 | if (!vstack_ax(stack)) { | |
1655 | printk(KERN_WARNING "Empty stack\n\n"); | |
1656 | ret = -EINVAL; | |
1657 | goto end; | |
1658 | } | |
1659 | if (vstack_ax(stack)->type != REG_PTR) { | |
1660 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1661 | ret = -EINVAL; | |
1662 | goto end; | |
1663 | } | |
1664 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); | |
1665 | break; | |
1666 | } | |
1667 | ||
1668 | case FILTER_OP_GET_INDEX_U64: | |
1669 | { | |
1670 | /* Pop 1, push 1 */ | |
1671 | if (!vstack_ax(stack)) { | |
1672 | printk(KERN_WARNING "Empty stack\n\n"); | |
1673 | ret = -EINVAL; | |
1674 | goto end; | |
1675 | } | |
1676 | if (vstack_ax(stack)->type != REG_PTR) { | |
1677 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1678 | ret = -EINVAL; | |
1679 | goto end; | |
1680 | } | |
1681 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); | |
1682 | break; | |
1683 | } | |
1684 | ||
07dfc1d0 MD |
1685 | } |
1686 | end: | |
1687 | *_next_pc = next_pc; | |
1688 | return ret; | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * Never called concurrently (hash seed is shared). | |
1693 | */ | |
1694 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) | |
1695 | { | |
1696 | struct mp_table *mp_table; | |
7962cb86 | 1697 | char *pc, *next_pc, *start_pc; |
07dfc1d0 MD |
1698 | int ret = -EINVAL; |
1699 | struct vstack stack; | |
1700 | ||
1701 | vstack_init(&stack); | |
1702 | ||
1703 | mp_table = kzalloc(sizeof(*mp_table), GFP_KERNEL); | |
1704 | if (!mp_table) { | |
1705 | printk(KERN_WARNING "Error allocating hash table for bytecode validation\n"); | |
1706 | return -ENOMEM; | |
1707 | } | |
3834b99f | 1708 | start_pc = &bytecode->code[0]; |
07dfc1d0 MD |
1709 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
1710 | pc = next_pc) { | |
1711 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); | |
1712 | if (ret != 0) { | |
1713 | if (ret == -ERANGE) | |
1714 | printk(KERN_WARNING "filter bytecode overflow\n"); | |
1715 | goto end; | |
1716 | } | |
1717 | dbg_printk("Validating op %s (%u)\n", | |
1718 | lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), | |
1719 | (unsigned int) *(filter_opcode_t *) pc); | |
1720 | ||
1721 | /* | |
1722 | * For each instruction, validate the current context | |
1723 | * (traversal of entire execution flow), and validate | |
3834b99f | 1724 | * all merge points targeting this instruction. |
07dfc1d0 MD |
1725 | */ |
1726 | ret = validate_instruction_all_contexts(bytecode, mp_table, | |
1727 | &stack, start_pc, pc); | |
1728 | if (ret) | |
1729 | goto end; | |
1730 | ret = exec_insn(bytecode, mp_table, &stack, &next_pc, pc); | |
1731 | if (ret <= 0) | |
1732 | goto end; | |
1733 | } | |
1734 | end: | |
1735 | if (delete_all_nodes(mp_table)) { | |
1736 | if (!ret) { | |
1737 | printk(KERN_WARNING "Unexpected merge points\n"); | |
1738 | ret = -EINVAL; | |
1739 | } | |
1740 | } | |
1741 | kfree(mp_table); | |
1742 | return ret; | |
1743 | } |