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