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 | 14 | #include <wrapper/list.h> |
2df37e95 | 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)) { | |
5a15f70c | 90 | printk(KERN_WARNING "LTTng: filter: Merge points differ for offset %lu\n", |
07dfc1d0 MD |
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: | |
1242217a | 130 | case REG_U64: |
02aca193 PP |
131 | goto error_mismatch; |
132 | } | |
133 | break; | |
134 | case REG_STAR_GLOB_STRING: | |
135 | switch (vstack_bx(stack)->type) { | |
136 | default: | |
137 | case REG_DOUBLE: | |
3834b99f MD |
138 | goto error_type; |
139 | case REG_TYPE_UNKNOWN: | |
140 | goto unknown; | |
02aca193 PP |
141 | case REG_STRING: |
142 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { | |
143 | goto error_mismatch; | |
144 | } | |
145 | break; | |
146 | case REG_STAR_GLOB_STRING: | |
07dfc1d0 | 147 | case REG_S64: |
1242217a | 148 | case REG_U64: |
07dfc1d0 MD |
149 | goto error_mismatch; |
150 | } | |
151 | break; | |
152 | case REG_S64: | |
1242217a | 153 | case REG_U64: |
07dfc1d0 MD |
154 | switch (vstack_bx(stack)->type) { |
155 | default: | |
156 | case REG_DOUBLE: | |
3834b99f MD |
157 | goto error_type; |
158 | case REG_TYPE_UNKNOWN: | |
159 | goto unknown; | |
07dfc1d0 | 160 | case REG_STRING: |
02aca193 | 161 | case REG_STAR_GLOB_STRING: |
07dfc1d0 | 162 | goto error_mismatch; |
07dfc1d0 | 163 | case REG_S64: |
1242217a | 164 | case REG_U64: |
07dfc1d0 MD |
165 | break; |
166 | } | |
167 | break; | |
3834b99f MD |
168 | case REG_TYPE_UNKNOWN: |
169 | switch (vstack_bx(stack)->type) { | |
170 | default: | |
171 | case REG_DOUBLE: | |
172 | goto error_type; | |
173 | case REG_TYPE_UNKNOWN: | |
174 | case REG_STRING: | |
175 | case REG_STAR_GLOB_STRING: | |
176 | case REG_S64: | |
1242217a | 177 | case REG_U64: |
3834b99f MD |
178 | goto unknown; |
179 | } | |
180 | break; | |
07dfc1d0 MD |
181 | } |
182 | return 0; | |
183 | ||
3834b99f MD |
184 | unknown: |
185 | return 1; | |
186 | ||
187 | error_empty: | |
5a15f70c | 188 | printk(KERN_WARNING "LTTng: filter: empty stack for '%s' binary operator\n", str); |
07dfc1d0 MD |
189 | return -EINVAL; |
190 | ||
191 | error_mismatch: | |
5a15f70c | 192 | printk(KERN_WARNING "LTTng: filter: type mismatch for '%s' binary operator\n", str); |
07dfc1d0 | 193 | return -EINVAL; |
3834b99f MD |
194 | |
195 | error_type: | |
5a15f70c | 196 | printk(KERN_WARNING "LTTng: filter: unknown type for '%s' binary operator\n", str); |
3834b99f MD |
197 | return -EINVAL; |
198 | } | |
199 | ||
200 | /* | |
201 | * Binary bitwise operators use top of stack and top of stack -1. | |
202 | * Return 0 if typing is known to match, 1 if typing is dynamic | |
203 | * (unknown), negative error value on error. | |
204 | */ | |
205 | static | |
206 | int bin_op_bitwise_check(struct vstack *stack, filter_opcode_t opcode, | |
207 | const char *str) | |
208 | { | |
209 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) | |
210 | goto error_empty; | |
211 | ||
212 | switch (vstack_ax(stack)->type) { | |
213 | default: | |
214 | case REG_DOUBLE: | |
215 | goto error_type; | |
216 | ||
217 | case REG_TYPE_UNKNOWN: | |
218 | switch (vstack_bx(stack)->type) { | |
219 | default: | |
220 | case REG_DOUBLE: | |
221 | goto error_type; | |
222 | case REG_TYPE_UNKNOWN: | |
3834b99f | 223 | case REG_S64: |
1242217a | 224 | case REG_U64: |
3834b99f MD |
225 | goto unknown; |
226 | } | |
227 | break; | |
228 | case REG_S64: | |
1242217a | 229 | case REG_U64: |
3834b99f MD |
230 | switch (vstack_bx(stack)->type) { |
231 | default: | |
232 | case REG_DOUBLE: | |
233 | goto error_type; | |
234 | case REG_TYPE_UNKNOWN: | |
235 | goto unknown; | |
236 | case REG_S64: | |
1242217a | 237 | case REG_U64: |
3834b99f MD |
238 | break; |
239 | } | |
240 | break; | |
241 | } | |
242 | return 0; | |
243 | ||
244 | unknown: | |
245 | return 1; | |
246 | ||
247 | error_empty: | |
5a15f70c | 248 | printk(KERN_WARNING "LTTng: filter: empty stack for '%s' binary operator\n", str); |
3834b99f MD |
249 | return -EINVAL; |
250 | ||
251 | error_type: | |
5a15f70c | 252 | printk(KERN_WARNING "LTTng: filter: unknown type for '%s' binary operator\n", str); |
3834b99f MD |
253 | return -EINVAL; |
254 | } | |
255 | ||
256 | static | |
257 | int validate_get_symbol(struct bytecode_runtime *bytecode, | |
258 | const struct get_symbol *sym) | |
259 | { | |
260 | const char *str, *str_limit; | |
261 | size_t len_limit; | |
262 | ||
263 | if (sym->offset >= bytecode->p.bc->bc.len - bytecode->p.bc->bc.reloc_offset) | |
264 | return -EINVAL; | |
265 | ||
266 | str = bytecode->p.bc->bc.data + bytecode->p.bc->bc.reloc_offset + sym->offset; | |
267 | str_limit = bytecode->p.bc->bc.data + bytecode->p.bc->bc.len; | |
268 | len_limit = str_limit - str; | |
269 | if (strnlen(str, len_limit) == len_limit) | |
270 | return -EINVAL; | |
271 | return 0; | |
07dfc1d0 MD |
272 | } |
273 | ||
274 | /* | |
275 | * Validate bytecode range overflow within the validation pass. | |
276 | * Called for each instruction encountered. | |
277 | */ | |
278 | static | |
279 | int bytecode_validate_overflow(struct bytecode_runtime *bytecode, | |
7962cb86 | 280 | char *start_pc, char *pc) |
07dfc1d0 MD |
281 | { |
282 | int ret = 0; | |
283 | ||
284 | switch (*(filter_opcode_t *) pc) { | |
285 | case FILTER_OP_UNKNOWN: | |
286 | default: | |
287 | { | |
5a15f70c | 288 | printk(KERN_WARNING "LTTng: filter: unknown bytecode op %u\n", |
07dfc1d0 MD |
289 | (unsigned int) *(filter_opcode_t *) pc); |
290 | ret = -EINVAL; | |
291 | break; | |
292 | } | |
293 | ||
294 | case FILTER_OP_RETURN: | |
57ba4b41 | 295 | case FILTER_OP_RETURN_S64: |
07dfc1d0 MD |
296 | { |
297 | if (unlikely(pc + sizeof(struct return_op) | |
298 | > start_pc + bytecode->len)) { | |
299 | ret = -ERANGE; | |
300 | } | |
301 | break; | |
302 | } | |
303 | ||
304 | /* binary */ | |
305 | case FILTER_OP_MUL: | |
306 | case FILTER_OP_DIV: | |
307 | case FILTER_OP_MOD: | |
308 | case FILTER_OP_PLUS: | |
309 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
310 | case FILTER_OP_EQ_DOUBLE: |
311 | case FILTER_OP_NE_DOUBLE: | |
312 | case FILTER_OP_GT_DOUBLE: | |
313 | case FILTER_OP_LT_DOUBLE: | |
314 | case FILTER_OP_GE_DOUBLE: | |
315 | case FILTER_OP_LE_DOUBLE: | |
316 | /* Floating point */ | |
317 | case FILTER_OP_EQ_DOUBLE_S64: | |
318 | case FILTER_OP_NE_DOUBLE_S64: | |
319 | case FILTER_OP_GT_DOUBLE_S64: | |
320 | case FILTER_OP_LT_DOUBLE_S64: | |
321 | case FILTER_OP_GE_DOUBLE_S64: | |
322 | case FILTER_OP_LE_DOUBLE_S64: | |
323 | case FILTER_OP_EQ_S64_DOUBLE: | |
324 | case FILTER_OP_NE_S64_DOUBLE: | |
325 | case FILTER_OP_GT_S64_DOUBLE: | |
326 | case FILTER_OP_LT_S64_DOUBLE: | |
327 | case FILTER_OP_GE_S64_DOUBLE: | |
328 | case FILTER_OP_LE_S64_DOUBLE: | |
329 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
330 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
331 | case FILTER_OP_LOAD_DOUBLE: | |
332 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
333 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
334 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
335 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
336 | { | |
5a15f70c | 337 | printk(KERN_WARNING "LTTng: filter: unsupported bytecode op %u\n", |
07dfc1d0 MD |
338 | (unsigned int) *(filter_opcode_t *) pc); |
339 | ret = -EINVAL; | |
340 | break; | |
341 | } | |
342 | ||
343 | case FILTER_OP_EQ: | |
344 | case FILTER_OP_NE: | |
345 | case FILTER_OP_GT: | |
346 | case FILTER_OP_LT: | |
347 | case FILTER_OP_GE: | |
348 | case FILTER_OP_LE: | |
349 | case FILTER_OP_EQ_STRING: | |
350 | case FILTER_OP_NE_STRING: | |
351 | case FILTER_OP_GT_STRING: | |
352 | case FILTER_OP_LT_STRING: | |
353 | case FILTER_OP_GE_STRING: | |
354 | case FILTER_OP_LE_STRING: | |
02aca193 PP |
355 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
356 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
07dfc1d0 MD |
357 | case FILTER_OP_EQ_S64: |
358 | case FILTER_OP_NE_S64: | |
359 | case FILTER_OP_GT_S64: | |
360 | case FILTER_OP_LT_S64: | |
361 | case FILTER_OP_GE_S64: | |
362 | case FILTER_OP_LE_S64: | |
e16c054b MD |
363 | case FILTER_OP_BIT_RSHIFT: |
364 | case FILTER_OP_BIT_LSHIFT: | |
3834b99f MD |
365 | case FILTER_OP_BIT_AND: |
366 | case FILTER_OP_BIT_OR: | |
367 | case FILTER_OP_BIT_XOR: | |
07dfc1d0 MD |
368 | { |
369 | if (unlikely(pc + sizeof(struct binary_op) | |
370 | > start_pc + bytecode->len)) { | |
371 | ret = -ERANGE; | |
372 | } | |
373 | break; | |
374 | } | |
375 | ||
376 | /* unary */ | |
377 | case FILTER_OP_UNARY_PLUS: | |
378 | case FILTER_OP_UNARY_MINUS: | |
379 | case FILTER_OP_UNARY_NOT: | |
380 | case FILTER_OP_UNARY_PLUS_S64: | |
381 | case FILTER_OP_UNARY_MINUS_S64: | |
382 | case FILTER_OP_UNARY_NOT_S64: | |
e16c054b | 383 | case FILTER_OP_UNARY_BIT_NOT: |
07dfc1d0 MD |
384 | { |
385 | if (unlikely(pc + sizeof(struct unary_op) | |
386 | > start_pc + bytecode->len)) { | |
387 | ret = -ERANGE; | |
388 | } | |
389 | break; | |
390 | } | |
391 | ||
392 | /* logical */ | |
393 | case FILTER_OP_AND: | |
394 | case FILTER_OP_OR: | |
395 | { | |
396 | if (unlikely(pc + sizeof(struct logical_op) | |
397 | > start_pc + bytecode->len)) { | |
398 | ret = -ERANGE; | |
399 | } | |
400 | break; | |
401 | } | |
402 | ||
403 | /* load field ref */ | |
404 | case FILTER_OP_LOAD_FIELD_REF: | |
405 | { | |
5a15f70c | 406 | printk(KERN_WARNING "LTTng: filter: Unknown field ref type\n"); |
07dfc1d0 MD |
407 | ret = -EINVAL; |
408 | break; | |
409 | } | |
3834b99f | 410 | |
07dfc1d0 MD |
411 | /* get context ref */ |
412 | case FILTER_OP_GET_CONTEXT_REF: | |
413 | { | |
5a15f70c | 414 | printk(KERN_WARNING "LTTng: filter: Unknown field ref type\n"); |
07dfc1d0 MD |
415 | ret = -EINVAL; |
416 | break; | |
417 | } | |
418 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
419 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
f127e61e MD |
420 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
421 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
422 | case FILTER_OP_LOAD_FIELD_REF_S64: |
423 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
424 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
425 | { | |
426 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) | |
427 | > start_pc + bytecode->len)) { | |
428 | ret = -ERANGE; | |
429 | } | |
430 | break; | |
431 | } | |
432 | ||
433 | /* load from immediate operand */ | |
434 | case FILTER_OP_LOAD_STRING: | |
02aca193 | 435 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
07dfc1d0 MD |
436 | { |
437 | struct load_op *insn = (struct load_op *) pc; | |
438 | uint32_t str_len, maxlen; | |
439 | ||
440 | if (unlikely(pc + sizeof(struct load_op) | |
441 | > start_pc + bytecode->len)) { | |
442 | ret = -ERANGE; | |
443 | break; | |
444 | } | |
445 | ||
446 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); | |
447 | str_len = strnlen(insn->data, maxlen); | |
448 | if (unlikely(str_len >= maxlen)) { | |
449 | /* Final '\0' not found within range */ | |
450 | ret = -ERANGE; | |
451 | } | |
452 | break; | |
453 | } | |
454 | ||
455 | case FILTER_OP_LOAD_S64: | |
456 | { | |
457 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) | |
458 | > start_pc + bytecode->len)) { | |
459 | ret = -ERANGE; | |
460 | } | |
461 | break; | |
462 | } | |
463 | ||
464 | case FILTER_OP_CAST_TO_S64: | |
465 | case FILTER_OP_CAST_NOP: | |
466 | { | |
467 | if (unlikely(pc + sizeof(struct cast_op) | |
468 | > start_pc + bytecode->len)) { | |
469 | ret = -ERANGE; | |
470 | } | |
471 | break; | |
472 | } | |
473 | ||
3834b99f MD |
474 | /* |
475 | * Instructions for recursive traversal through composed types. | |
476 | */ | |
477 | case FILTER_OP_GET_CONTEXT_ROOT: | |
478 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
479 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
480 | case FILTER_OP_LOAD_FIELD: | |
481 | case FILTER_OP_LOAD_FIELD_S8: | |
482 | case FILTER_OP_LOAD_FIELD_S16: | |
483 | case FILTER_OP_LOAD_FIELD_S32: | |
484 | case FILTER_OP_LOAD_FIELD_S64: | |
485 | case FILTER_OP_LOAD_FIELD_U8: | |
486 | case FILTER_OP_LOAD_FIELD_U16: | |
487 | case FILTER_OP_LOAD_FIELD_U32: | |
488 | case FILTER_OP_LOAD_FIELD_U64: | |
489 | case FILTER_OP_LOAD_FIELD_STRING: | |
490 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
491 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
492 | if (unlikely(pc + sizeof(struct load_op) | |
493 | > start_pc + bytecode->len)) { | |
494 | ret = -ERANGE; | |
495 | } | |
496 | break; | |
497 | ||
498 | case FILTER_OP_GET_SYMBOL: | |
499 | { | |
500 | struct load_op *insn = (struct load_op *) pc; | |
501 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
502 | ||
503 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol) | |
504 | > start_pc + bytecode->len)) { | |
505 | ret = -ERANGE; | |
3aeca857 | 506 | break; |
3834b99f MD |
507 | } |
508 | ret = validate_get_symbol(bytecode, sym); | |
509 | break; | |
510 | } | |
511 | ||
512 | case FILTER_OP_GET_SYMBOL_FIELD: | |
5a15f70c | 513 | printk(KERN_WARNING "LTTng: filter: Unexpected get symbol field\n"); |
3834b99f MD |
514 | ret = -EINVAL; |
515 | break; | |
516 | ||
517 | case FILTER_OP_GET_INDEX_U16: | |
518 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16) | |
519 | > start_pc + bytecode->len)) { | |
520 | ret = -ERANGE; | |
521 | } | |
522 | break; | |
523 | ||
524 | case FILTER_OP_GET_INDEX_U64: | |
525 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64) | |
526 | > start_pc + bytecode->len)) { | |
527 | ret = -ERANGE; | |
528 | } | |
529 | break; | |
07dfc1d0 MD |
530 | } |
531 | ||
532 | return ret; | |
533 | } | |
534 | ||
535 | static | |
536 | unsigned long delete_all_nodes(struct mp_table *mp_table) | |
537 | { | |
538 | struct mp_node *mp_node; | |
539 | struct hlist_node *tmp; | |
540 | unsigned long nr_nodes = 0; | |
541 | int i; | |
542 | ||
543 | for (i = 0; i < MERGE_POINT_TABLE_SIZE; i++) { | |
544 | struct hlist_head *head; | |
545 | ||
546 | head = &mp_table->mp_head[i]; | |
d216ecae | 547 | lttng_hlist_for_each_entry_safe(mp_node, tmp, head, node) { |
07dfc1d0 MD |
548 | kfree(mp_node); |
549 | nr_nodes++; | |
550 | } | |
551 | } | |
552 | return nr_nodes; | |
553 | } | |
554 | ||
555 | /* | |
556 | * Return value: | |
3834b99f | 557 | * >=0: success |
07dfc1d0 MD |
558 | * <0: error |
559 | */ | |
560 | static | |
561 | int validate_instruction_context(struct bytecode_runtime *bytecode, | |
562 | struct vstack *stack, | |
7962cb86 MD |
563 | char *start_pc, |
564 | char *pc) | |
07dfc1d0 MD |
565 | { |
566 | int ret = 0; | |
02aca193 | 567 | const filter_opcode_t opcode = *(filter_opcode_t *) pc; |
07dfc1d0 | 568 | |
02aca193 | 569 | switch (opcode) { |
07dfc1d0 MD |
570 | case FILTER_OP_UNKNOWN: |
571 | default: | |
572 | { | |
5a15f70c | 573 | printk(KERN_WARNING "LTTng: filter: unknown bytecode op %u\n", |
07dfc1d0 MD |
574 | (unsigned int) *(filter_opcode_t *) pc); |
575 | ret = -EINVAL; | |
576 | goto end; | |
577 | } | |
578 | ||
579 | case FILTER_OP_RETURN: | |
57ba4b41 | 580 | case FILTER_OP_RETURN_S64: |
07dfc1d0 MD |
581 | { |
582 | goto end; | |
583 | } | |
584 | ||
585 | /* binary */ | |
586 | case FILTER_OP_MUL: | |
587 | case FILTER_OP_DIV: | |
588 | case FILTER_OP_MOD: | |
589 | case FILTER_OP_PLUS: | |
590 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
591 | /* Floating point */ |
592 | case FILTER_OP_EQ_DOUBLE: | |
593 | case FILTER_OP_NE_DOUBLE: | |
594 | case FILTER_OP_GT_DOUBLE: | |
595 | case FILTER_OP_LT_DOUBLE: | |
596 | case FILTER_OP_GE_DOUBLE: | |
597 | case FILTER_OP_LE_DOUBLE: | |
598 | case FILTER_OP_EQ_DOUBLE_S64: | |
599 | case FILTER_OP_NE_DOUBLE_S64: | |
600 | case FILTER_OP_GT_DOUBLE_S64: | |
601 | case FILTER_OP_LT_DOUBLE_S64: | |
602 | case FILTER_OP_GE_DOUBLE_S64: | |
603 | case FILTER_OP_LE_DOUBLE_S64: | |
604 | case FILTER_OP_EQ_S64_DOUBLE: | |
605 | case FILTER_OP_NE_S64_DOUBLE: | |
606 | case FILTER_OP_GT_S64_DOUBLE: | |
607 | case FILTER_OP_LT_S64_DOUBLE: | |
608 | case FILTER_OP_GE_S64_DOUBLE: | |
609 | case FILTER_OP_LE_S64_DOUBLE: | |
610 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
611 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
612 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
613 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
614 | case FILTER_OP_LOAD_DOUBLE: | |
615 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
616 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
617 | { | |
5a15f70c | 618 | printk(KERN_WARNING "LTTng: filter: unsupported bytecode op %u\n", |
07dfc1d0 MD |
619 | (unsigned int) *(filter_opcode_t *) pc); |
620 | ret = -EINVAL; | |
621 | goto end; | |
622 | } | |
623 | ||
624 | case FILTER_OP_EQ: | |
625 | { | |
02aca193 | 626 | ret = bin_op_compare_check(stack, opcode, "=="); |
3834b99f | 627 | if (ret < 0) |
07dfc1d0 MD |
628 | goto end; |
629 | break; | |
630 | } | |
631 | case FILTER_OP_NE: | |
632 | { | |
02aca193 | 633 | ret = bin_op_compare_check(stack, opcode, "!="); |
3834b99f | 634 | if (ret < 0) |
07dfc1d0 MD |
635 | goto end; |
636 | break; | |
637 | } | |
638 | case FILTER_OP_GT: | |
639 | { | |
02aca193 | 640 | ret = bin_op_compare_check(stack, opcode, ">"); |
3834b99f | 641 | if (ret < 0) |
07dfc1d0 MD |
642 | goto end; |
643 | break; | |
644 | } | |
645 | case FILTER_OP_LT: | |
646 | { | |
02aca193 | 647 | ret = bin_op_compare_check(stack, opcode, "<"); |
3834b99f | 648 | if (ret < 0) |
07dfc1d0 MD |
649 | goto end; |
650 | break; | |
651 | } | |
652 | case FILTER_OP_GE: | |
653 | { | |
02aca193 | 654 | ret = bin_op_compare_check(stack, opcode, ">="); |
3834b99f | 655 | if (ret < 0) |
07dfc1d0 MD |
656 | goto end; |
657 | break; | |
658 | } | |
659 | case FILTER_OP_LE: | |
660 | { | |
02aca193 | 661 | ret = bin_op_compare_check(stack, opcode, "<="); |
3834b99f | 662 | if (ret < 0) |
07dfc1d0 MD |
663 | goto end; |
664 | break; | |
665 | } | |
666 | ||
667 | case FILTER_OP_EQ_STRING: | |
668 | case FILTER_OP_NE_STRING: | |
669 | case FILTER_OP_GT_STRING: | |
670 | case FILTER_OP_LT_STRING: | |
671 | case FILTER_OP_GE_STRING: | |
672 | case FILTER_OP_LE_STRING: | |
673 | { | |
674 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
5a15f70c | 675 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
676 | ret = -EINVAL; |
677 | goto end; | |
678 | } | |
679 | if (vstack_ax(stack)->type != REG_STRING | |
680 | || vstack_bx(stack)->type != REG_STRING) { | |
5a15f70c | 681 | printk(KERN_WARNING "LTTng: filter: Unexpected register type for string comparator\n"); |
07dfc1d0 MD |
682 | ret = -EINVAL; |
683 | goto end; | |
684 | } | |
685 | break; | |
686 | } | |
687 | ||
02aca193 PP |
688 | |
689 | case FILTER_OP_EQ_STAR_GLOB_STRING: | |
690 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
691 | { | |
692 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
5a15f70c | 693 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
02aca193 PP |
694 | ret = -EINVAL; |
695 | goto end; | |
696 | } | |
697 | if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING | |
698 | && vstack_bx(stack)->type != REG_STAR_GLOB_STRING) { | |
5a15f70c | 699 | printk(KERN_WARNING "LTTng: filter: Unexpected register type for globbing pattern comparator\n"); |
02aca193 PP |
700 | ret = -EINVAL; |
701 | goto end; | |
702 | } | |
703 | break; | |
704 | } | |
705 | ||
07dfc1d0 MD |
706 | case FILTER_OP_EQ_S64: |
707 | case FILTER_OP_NE_S64: | |
708 | case FILTER_OP_GT_S64: | |
709 | case FILTER_OP_LT_S64: | |
710 | case FILTER_OP_GE_S64: | |
711 | case FILTER_OP_LE_S64: | |
712 | { | |
713 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
5a15f70c | 714 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
715 | ret = -EINVAL; |
716 | goto end; | |
717 | } | |
1242217a FD |
718 | switch (vstack_ax(stack)->type) { |
719 | case REG_S64: | |
720 | case REG_U64: | |
721 | break; | |
722 | default: | |
723 | printk(KERN_WARNING "LTTng: filter: Unexpected register type for s64 comparator\n"); | |
724 | ret = -EINVAL; | |
725 | goto end; | |
726 | } | |
727 | switch (vstack_bx(stack)->type) { | |
728 | case REG_S64: | |
729 | case REG_U64: | |
730 | break; | |
731 | default: | |
5a15f70c | 732 | printk(KERN_WARNING "LTTng: filter: Unexpected register type for s64 comparator\n"); |
07dfc1d0 MD |
733 | ret = -EINVAL; |
734 | goto end; | |
735 | } | |
736 | break; | |
737 | } | |
738 | ||
e16c054b MD |
739 | case FILTER_OP_BIT_RSHIFT: |
740 | ret = bin_op_bitwise_check(stack, opcode, ">>"); | |
741 | if (ret < 0) | |
742 | goto end; | |
743 | break; | |
744 | case FILTER_OP_BIT_LSHIFT: | |
745 | ret = bin_op_bitwise_check(stack, opcode, "<<"); | |
746 | if (ret < 0) | |
747 | goto end; | |
748 | break; | |
3834b99f MD |
749 | case FILTER_OP_BIT_AND: |
750 | ret = bin_op_bitwise_check(stack, opcode, "&"); | |
751 | if (ret < 0) | |
752 | goto end; | |
753 | break; | |
754 | case FILTER_OP_BIT_OR: | |
755 | ret = bin_op_bitwise_check(stack, opcode, "|"); | |
756 | if (ret < 0) | |
757 | goto end; | |
758 | break; | |
759 | case FILTER_OP_BIT_XOR: | |
760 | ret = bin_op_bitwise_check(stack, opcode, "^"); | |
761 | if (ret < 0) | |
762 | goto end; | |
763 | break; | |
764 | ||
07dfc1d0 MD |
765 | /* unary */ |
766 | case FILTER_OP_UNARY_PLUS: | |
767 | case FILTER_OP_UNARY_MINUS: | |
768 | case FILTER_OP_UNARY_NOT: | |
769 | { | |
770 | if (!vstack_ax(stack)) { | |
5a15f70c | 771 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
772 | ret = -EINVAL; |
773 | goto end; | |
774 | } | |
775 | switch (vstack_ax(stack)->type) { | |
776 | default: | |
777 | case REG_DOUBLE: | |
5a15f70c | 778 | printk(KERN_WARNING "LTTng: filter: unknown register type\n"); |
07dfc1d0 MD |
779 | ret = -EINVAL; |
780 | goto end; | |
781 | ||
782 | case REG_STRING: | |
02aca193 | 783 | case REG_STAR_GLOB_STRING: |
5a15f70c | 784 | printk(KERN_WARNING "LTTng: filter: Unary op can only be applied to numeric or floating point registers\n"); |
07dfc1d0 MD |
785 | ret = -EINVAL; |
786 | goto end; | |
787 | case REG_S64: | |
1242217a | 788 | case REG_U64: |
3834b99f | 789 | case REG_TYPE_UNKNOWN: |
07dfc1d0 MD |
790 | break; |
791 | } | |
792 | break; | |
793 | } | |
e16c054b MD |
794 | case FILTER_OP_UNARY_BIT_NOT: |
795 | { | |
796 | if (!vstack_ax(stack)) { | |
5a15f70c | 797 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
e16c054b MD |
798 | ret = -EINVAL; |
799 | goto end; | |
800 | } | |
801 | switch (vstack_ax(stack)->type) { | |
802 | default: | |
5a15f70c | 803 | printk(KERN_WARNING "LTTng: filter: unknown register type\n"); |
e16c054b MD |
804 | ret = -EINVAL; |
805 | goto end; | |
806 | ||
807 | case REG_STRING: | |
808 | case REG_STAR_GLOB_STRING: | |
809 | case REG_DOUBLE: | |
5a15f70c | 810 | printk(KERN_WARNING "LTTng: filter: Unary bitwise op can only be applied to numeric registers\n"); |
e16c054b MD |
811 | ret = -EINVAL; |
812 | goto end; | |
813 | case REG_S64: | |
1242217a | 814 | case REG_U64: |
e16c054b MD |
815 | case REG_TYPE_UNKNOWN: |
816 | break; | |
817 | } | |
818 | break; | |
819 | } | |
07dfc1d0 MD |
820 | |
821 | case FILTER_OP_UNARY_PLUS_S64: | |
822 | case FILTER_OP_UNARY_MINUS_S64: | |
823 | case FILTER_OP_UNARY_NOT_S64: | |
824 | { | |
825 | if (!vstack_ax(stack)) { | |
5a15f70c | 826 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
827 | ret = -EINVAL; |
828 | goto end; | |
829 | } | |
1242217a FD |
830 | if (vstack_ax(stack)->type != REG_S64 && |
831 | vstack_ax(stack)->type != REG_U64) { | |
5a15f70c | 832 | printk(KERN_WARNING "LTTng: filter: Invalid register type\n"); |
07dfc1d0 MD |
833 | ret = -EINVAL; |
834 | goto end; | |
835 | } | |
836 | break; | |
837 | } | |
838 | ||
839 | /* logical */ | |
840 | case FILTER_OP_AND: | |
841 | case FILTER_OP_OR: | |
842 | { | |
843 | struct logical_op *insn = (struct logical_op *) pc; | |
844 | ||
845 | if (!vstack_ax(stack)) { | |
5a15f70c | 846 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
847 | ret = -EINVAL; |
848 | goto end; | |
849 | } | |
1242217a FD |
850 | if (vstack_ax(stack)->type != REG_S64 && |
851 | vstack_ax(stack)->type != REG_U64) { | |
5a15f70c | 852 | printk(KERN_WARNING "LTTng: filter: Logical comparator expects S64 register\n"); |
07dfc1d0 MD |
853 | ret = -EINVAL; |
854 | goto end; | |
855 | } | |
856 | ||
857 | dbg_printk("Validate jumping to bytecode offset %u\n", | |
858 | (unsigned int) insn->skip_offset); | |
859 | if (unlikely(start_pc + insn->skip_offset <= pc)) { | |
5a15f70c | 860 | printk(KERN_WARNING "LTTng: filter: Loops are not allowed in bytecode\n"); |
07dfc1d0 MD |
861 | ret = -EINVAL; |
862 | goto end; | |
863 | } | |
864 | break; | |
865 | } | |
866 | ||
867 | /* load field ref */ | |
868 | case FILTER_OP_LOAD_FIELD_REF: | |
869 | { | |
5a15f70c | 870 | printk(KERN_WARNING "LTTng: filter: Unknown field ref type\n"); |
07dfc1d0 MD |
871 | ret = -EINVAL; |
872 | goto end; | |
873 | } | |
874 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
875 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
f127e61e MD |
876 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
877 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
878 | { |
879 | struct load_op *insn = (struct load_op *) pc; | |
880 | struct field_ref *ref = (struct field_ref *) insn->data; | |
881 | ||
882 | dbg_printk("Validate load field ref offset %u type string\n", | |
883 | ref->offset); | |
884 | break; | |
885 | } | |
886 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
887 | { | |
888 | struct load_op *insn = (struct load_op *) pc; | |
889 | struct field_ref *ref = (struct field_ref *) insn->data; | |
890 | ||
891 | dbg_printk("Validate load field ref offset %u type s64\n", | |
892 | ref->offset); | |
893 | break; | |
894 | } | |
895 | ||
896 | /* load from immediate operand */ | |
897 | case FILTER_OP_LOAD_STRING: | |
02aca193 | 898 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
07dfc1d0 MD |
899 | { |
900 | break; | |
901 | } | |
902 | ||
903 | case FILTER_OP_LOAD_S64: | |
904 | { | |
905 | break; | |
906 | } | |
907 | ||
908 | case FILTER_OP_CAST_TO_S64: | |
909 | { | |
910 | struct cast_op *insn = (struct cast_op *) pc; | |
911 | ||
912 | if (!vstack_ax(stack)) { | |
5a15f70c | 913 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
914 | ret = -EINVAL; |
915 | goto end; | |
916 | } | |
917 | switch (vstack_ax(stack)->type) { | |
918 | default: | |
919 | case REG_DOUBLE: | |
5a15f70c | 920 | printk(KERN_WARNING "LTTng: filter: unknown register type\n"); |
07dfc1d0 MD |
921 | ret = -EINVAL; |
922 | goto end; | |
923 | ||
924 | case REG_STRING: | |
02aca193 | 925 | case REG_STAR_GLOB_STRING: |
5a15f70c | 926 | printk(KERN_WARNING "LTTng: filter: Cast op can only be applied to numeric or floating point registers\n"); |
07dfc1d0 MD |
927 | ret = -EINVAL; |
928 | goto end; | |
929 | case REG_S64: | |
930 | break; | |
931 | } | |
932 | if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) { | |
933 | if (vstack_ax(stack)->type != REG_DOUBLE) { | |
5a15f70c | 934 | printk(KERN_WARNING "LTTng: filter: Cast expects double\n"); |
07dfc1d0 MD |
935 | ret = -EINVAL; |
936 | goto end; | |
937 | } | |
938 | } | |
939 | break; | |
940 | } | |
941 | case FILTER_OP_CAST_NOP: | |
942 | { | |
943 | break; | |
944 | } | |
945 | ||
946 | /* get context ref */ | |
947 | case FILTER_OP_GET_CONTEXT_REF: | |
948 | { | |
5a15f70c | 949 | printk(KERN_WARNING "LTTng: filter: Unknown get context ref type\n"); |
07dfc1d0 MD |
950 | ret = -EINVAL; |
951 | goto end; | |
952 | } | |
953 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
954 | { | |
955 | struct load_op *insn = (struct load_op *) pc; | |
956 | struct field_ref *ref = (struct field_ref *) insn->data; | |
957 | ||
958 | dbg_printk("Validate get context ref offset %u type string\n", | |
959 | ref->offset); | |
960 | break; | |
961 | } | |
962 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
963 | { | |
964 | struct load_op *insn = (struct load_op *) pc; | |
965 | struct field_ref *ref = (struct field_ref *) insn->data; | |
966 | ||
967 | dbg_printk("Validate get context ref offset %u type s64\n", | |
968 | ref->offset); | |
969 | break; | |
970 | } | |
971 | ||
3834b99f MD |
972 | /* |
973 | * Instructions for recursive traversal through composed types. | |
974 | */ | |
975 | case FILTER_OP_GET_CONTEXT_ROOT: | |
976 | { | |
977 | dbg_printk("Validate get context root\n"); | |
978 | break; | |
979 | } | |
980 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
981 | { | |
982 | dbg_printk("Validate get app context root\n"); | |
983 | break; | |
984 | } | |
985 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
986 | { | |
987 | dbg_printk("Validate get payload root\n"); | |
988 | break; | |
989 | } | |
990 | case FILTER_OP_LOAD_FIELD: | |
991 | { | |
992 | /* | |
993 | * We tolerate that field type is unknown at validation, | |
994 | * because we are performing the load specialization in | |
995 | * a phase after validation. | |
996 | */ | |
997 | dbg_printk("Validate load field\n"); | |
998 | break; | |
999 | } | |
1000 | case FILTER_OP_LOAD_FIELD_S8: | |
1001 | { | |
1002 | dbg_printk("Validate load field s8\n"); | |
1003 | break; | |
1004 | } | |
1005 | case FILTER_OP_LOAD_FIELD_S16: | |
1006 | { | |
1007 | dbg_printk("Validate load field s16\n"); | |
1008 | break; | |
1009 | } | |
1010 | case FILTER_OP_LOAD_FIELD_S32: | |
1011 | { | |
1012 | dbg_printk("Validate load field s32\n"); | |
1013 | break; | |
1014 | } | |
1015 | case FILTER_OP_LOAD_FIELD_S64: | |
1016 | { | |
1017 | dbg_printk("Validate load field s64\n"); | |
1018 | break; | |
1019 | } | |
1020 | case FILTER_OP_LOAD_FIELD_U8: | |
1021 | { | |
1022 | dbg_printk("Validate load field u8\n"); | |
1023 | break; | |
1024 | } | |
1025 | case FILTER_OP_LOAD_FIELD_U16: | |
1026 | { | |
1027 | dbg_printk("Validate load field u16\n"); | |
1028 | break; | |
1029 | } | |
1030 | case FILTER_OP_LOAD_FIELD_U32: | |
1031 | { | |
1032 | dbg_printk("Validate load field u32\n"); | |
1033 | break; | |
1034 | } | |
1035 | case FILTER_OP_LOAD_FIELD_U64: | |
1036 | { | |
1037 | dbg_printk("Validate load field u64\n"); | |
1038 | break; | |
1039 | } | |
1040 | case FILTER_OP_LOAD_FIELD_STRING: | |
1041 | { | |
1042 | dbg_printk("Validate load field string\n"); | |
1043 | break; | |
1044 | } | |
1045 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
1046 | { | |
1047 | dbg_printk("Validate load field sequence\n"); | |
1048 | break; | |
1049 | } | |
1050 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
1051 | { | |
1052 | dbg_printk("Validate load field double\n"); | |
1053 | break; | |
1054 | } | |
1055 | ||
1056 | case FILTER_OP_GET_SYMBOL: | |
1057 | { | |
1058 | struct load_op *insn = (struct load_op *) pc; | |
1059 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1060 | ||
1061 | dbg_printk("Validate get symbol offset %u\n", sym->offset); | |
1062 | break; | |
1063 | } | |
1064 | ||
1065 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1066 | { | |
1067 | struct load_op *insn = (struct load_op *) pc; | |
1068 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1069 | ||
1070 | dbg_printk("Validate get symbol field offset %u\n", sym->offset); | |
1071 | break; | |
1072 | } | |
1073 | ||
1074 | case FILTER_OP_GET_INDEX_U16: | |
1075 | { | |
1076 | struct load_op *insn = (struct load_op *) pc; | |
1077 | struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data; | |
1078 | ||
1079 | dbg_printk("Validate get index u16 index %u\n", get_index->index); | |
1080 | break; | |
1081 | } | |
1082 | ||
1083 | case FILTER_OP_GET_INDEX_U64: | |
1084 | { | |
1085 | struct load_op *insn = (struct load_op *) pc; | |
1086 | struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data; | |
1087 | ||
1088 | dbg_printk("Validate get index u64 index %llu\n", | |
1089 | (unsigned long long) get_index->index); | |
1090 | break; | |
1091 | } | |
07dfc1d0 MD |
1092 | } |
1093 | end: | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * Return value: | |
1099 | * 0: success | |
1100 | * <0: error | |
1101 | */ | |
1102 | static | |
1103 | int validate_instruction_all_contexts(struct bytecode_runtime *bytecode, | |
1104 | struct mp_table *mp_table, | |
1105 | struct vstack *stack, | |
7962cb86 MD |
1106 | char *start_pc, |
1107 | char *pc) | |
07dfc1d0 MD |
1108 | { |
1109 | int ret, found = 0; | |
1110 | unsigned long target_pc = pc - start_pc; | |
1111 | unsigned long hash; | |
1112 | struct hlist_head *head; | |
1113 | struct mp_node *mp_node; | |
1114 | ||
1115 | /* Validate the context resulting from the previous instruction */ | |
1116 | ret = validate_instruction_context(bytecode, stack, start_pc, pc); | |
3834b99f | 1117 | if (ret < 0) |
07dfc1d0 MD |
1118 | return ret; |
1119 | ||
1120 | /* Validate merge points */ | |
1121 | hash = jhash_1word(target_pc, 0); | |
1122 | head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)]; | |
d216ecae | 1123 | lttng_hlist_for_each_entry(mp_node, head, node) { |
07dfc1d0 MD |
1124 | if (lttng_hash_match(mp_node, target_pc)) { |
1125 | found = 1; | |
1126 | break; | |
1127 | } | |
1128 | } | |
1129 | if (found) { | |
1130 | dbg_printk("Filter: validate merge point at offset %lu\n", | |
1131 | target_pc); | |
1132 | if (merge_points_compare(stack, &mp_node->stack)) { | |
5a15f70c | 1133 | printk(KERN_WARNING "LTTng: filter: Merge points differ for offset %lu\n", |
07dfc1d0 MD |
1134 | target_pc); |
1135 | return -EINVAL; | |
1136 | } | |
1137 | /* Once validated, we can remove the merge point */ | |
1138 | dbg_printk("Filter: remove merge point at offset %lu\n", | |
1139 | target_pc); | |
1140 | hlist_del(&mp_node->node); | |
1141 | } | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * Return value: | |
1147 | * >0: going to next insn. | |
1148 | * 0: success, stop iteration. | |
1149 | * <0: error | |
1150 | */ | |
1151 | static | |
1152 | int exec_insn(struct bytecode_runtime *bytecode, | |
1153 | struct mp_table *mp_table, | |
1154 | struct vstack *stack, | |
7962cb86 MD |
1155 | char **_next_pc, |
1156 | char *pc) | |
07dfc1d0 MD |
1157 | { |
1158 | int ret = 1; | |
7962cb86 | 1159 | char *next_pc = *_next_pc; |
07dfc1d0 MD |
1160 | |
1161 | switch (*(filter_opcode_t *) pc) { | |
1162 | case FILTER_OP_UNKNOWN: | |
1163 | default: | |
1164 | { | |
5a15f70c | 1165 | printk(KERN_WARNING "LTTng: filter: unknown bytecode op %u\n", |
07dfc1d0 MD |
1166 | (unsigned int) *(filter_opcode_t *) pc); |
1167 | ret = -EINVAL; | |
1168 | goto end; | |
1169 | } | |
1170 | ||
1171 | case FILTER_OP_RETURN: | |
1172 | { | |
1173 | if (!vstack_ax(stack)) { | |
5a15f70c | 1174 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
1175 | ret = -EINVAL; |
1176 | goto end; | |
1177 | } | |
3834b99f MD |
1178 | switch (vstack_ax(stack)->type) { |
1179 | case REG_S64: | |
1242217a | 1180 | case REG_U64: |
3834b99f MD |
1181 | case REG_TYPE_UNKNOWN: |
1182 | break; | |
1183 | default: | |
5a15f70c | 1184 | printk(KERN_WARNING "LTTng: filter: Unexpected register type %d at end of bytecode\n", |
3834b99f MD |
1185 | (int) vstack_ax(stack)->type); |
1186 | ret = -EINVAL; | |
1187 | goto end; | |
1188 | } | |
1189 | ||
07dfc1d0 MD |
1190 | ret = 0; |
1191 | goto end; | |
1192 | } | |
1193 | ||
57ba4b41 MD |
1194 | case FILTER_OP_RETURN_S64: |
1195 | { | |
1196 | if (!vstack_ax(stack)) { | |
5a15f70c | 1197 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
57ba4b41 MD |
1198 | ret = -EINVAL; |
1199 | goto end; | |
1200 | } | |
1201 | switch (vstack_ax(stack)->type) { | |
1202 | case REG_S64: | |
1242217a | 1203 | case REG_U64: |
57ba4b41 MD |
1204 | break; |
1205 | default: | |
1206 | case REG_TYPE_UNKNOWN: | |
5a15f70c | 1207 | printk(KERN_WARNING "LTTng: filter: Unexpected register type %d at end of bytecode\n", |
57ba4b41 MD |
1208 | (int) vstack_ax(stack)->type); |
1209 | ret = -EINVAL; | |
1210 | goto end; | |
1211 | } | |
1212 | ||
1213 | ret = 0; | |
1214 | goto end; | |
1215 | } | |
1216 | ||
07dfc1d0 MD |
1217 | /* binary */ |
1218 | case FILTER_OP_MUL: | |
1219 | case FILTER_OP_DIV: | |
1220 | case FILTER_OP_MOD: | |
1221 | case FILTER_OP_PLUS: | |
1222 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
1223 | /* Floating point */ |
1224 | case FILTER_OP_EQ_DOUBLE: | |
1225 | case FILTER_OP_NE_DOUBLE: | |
1226 | case FILTER_OP_GT_DOUBLE: | |
1227 | case FILTER_OP_LT_DOUBLE: | |
1228 | case FILTER_OP_GE_DOUBLE: | |
1229 | case FILTER_OP_LE_DOUBLE: | |
1230 | case FILTER_OP_EQ_DOUBLE_S64: | |
1231 | case FILTER_OP_NE_DOUBLE_S64: | |
1232 | case FILTER_OP_GT_DOUBLE_S64: | |
1233 | case FILTER_OP_LT_DOUBLE_S64: | |
1234 | case FILTER_OP_GE_DOUBLE_S64: | |
1235 | case FILTER_OP_LE_DOUBLE_S64: | |
1236 | case FILTER_OP_EQ_S64_DOUBLE: | |
1237 | case FILTER_OP_NE_S64_DOUBLE: | |
1238 | case FILTER_OP_GT_S64_DOUBLE: | |
1239 | case FILTER_OP_LT_S64_DOUBLE: | |
1240 | case FILTER_OP_GE_S64_DOUBLE: | |
1241 | case FILTER_OP_LE_S64_DOUBLE: | |
1242 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
1243 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
1244 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
1245 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
1246 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
1247 | case FILTER_OP_LOAD_DOUBLE: | |
1248 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
1249 | { | |
5a15f70c | 1250 | printk(KERN_WARNING "LTTng: filter: unsupported bytecode op %u\n", |
07dfc1d0 MD |
1251 | (unsigned int) *(filter_opcode_t *) pc); |
1252 | ret = -EINVAL; | |
1253 | goto end; | |
1254 | } | |
1255 | ||
1256 | case FILTER_OP_EQ: | |
1257 | case FILTER_OP_NE: | |
1258 | case FILTER_OP_GT: | |
1259 | case FILTER_OP_LT: | |
1260 | case FILTER_OP_GE: | |
1261 | case FILTER_OP_LE: | |
1262 | case FILTER_OP_EQ_STRING: | |
1263 | case FILTER_OP_NE_STRING: | |
1264 | case FILTER_OP_GT_STRING: | |
1265 | case FILTER_OP_LT_STRING: | |
1266 | case FILTER_OP_GE_STRING: | |
1267 | case FILTER_OP_LE_STRING: | |
02aca193 PP |
1268 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
1269 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
07dfc1d0 MD |
1270 | case FILTER_OP_EQ_S64: |
1271 | case FILTER_OP_NE_S64: | |
1272 | case FILTER_OP_GT_S64: | |
1273 | case FILTER_OP_LT_S64: | |
1274 | case FILTER_OP_GE_S64: | |
1275 | case FILTER_OP_LE_S64: | |
1242217a FD |
1276 | { |
1277 | /* Pop 2, push 1 */ | |
1278 | if (vstack_pop(stack)) { | |
1279 | ret = -EINVAL; | |
1280 | goto end; | |
1281 | } | |
1282 | if (!vstack_ax(stack)) { | |
1283 | printk(KERN_WARNING "Empty stack\n"); | |
1284 | ret = -EINVAL; | |
1285 | goto end; | |
1286 | } | |
1287 | switch (vstack_ax(stack)->type) { | |
1288 | case REG_S64: | |
1289 | case REG_U64: | |
1290 | case REG_DOUBLE: | |
1291 | case REG_STRING: | |
1292 | case REG_STAR_GLOB_STRING: | |
1293 | case REG_TYPE_UNKNOWN: | |
1294 | break; | |
1295 | default: | |
1296 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
1297 | (int) vstack_ax(stack)->type); | |
1298 | ret = -EINVAL; | |
1299 | goto end; | |
1300 | } | |
1301 | ||
1302 | vstack_ax(stack)->type = REG_S64; | |
1303 | next_pc += sizeof(struct binary_op); | |
1304 | break; | |
1305 | } | |
e16c054b MD |
1306 | case FILTER_OP_BIT_RSHIFT: |
1307 | case FILTER_OP_BIT_LSHIFT: | |
3834b99f MD |
1308 | case FILTER_OP_BIT_AND: |
1309 | case FILTER_OP_BIT_OR: | |
1310 | case FILTER_OP_BIT_XOR: | |
07dfc1d0 MD |
1311 | { |
1312 | /* Pop 2, push 1 */ | |
1313 | if (vstack_pop(stack)) { | |
1314 | ret = -EINVAL; | |
1315 | goto end; | |
1316 | } | |
1317 | if (!vstack_ax(stack)) { | |
5a15f70c | 1318 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
1319 | ret = -EINVAL; |
1320 | goto end; | |
1321 | } | |
3834b99f MD |
1322 | switch (vstack_ax(stack)->type) { |
1323 | case REG_S64: | |
1242217a | 1324 | case REG_U64: |
3834b99f MD |
1325 | case REG_DOUBLE: |
1326 | case REG_STRING: | |
1327 | case REG_STAR_GLOB_STRING: | |
1328 | case REG_TYPE_UNKNOWN: | |
1329 | break; | |
1330 | default: | |
5a15f70c | 1331 | printk(KERN_WARNING "LTTng: filter: Unexpected register type %d for operation\n", |
3834b99f MD |
1332 | (int) vstack_ax(stack)->type); |
1333 | ret = -EINVAL; | |
1334 | goto end; | |
1335 | } | |
1336 | ||
1242217a | 1337 | vstack_ax(stack)->type = REG_U64; |
07dfc1d0 MD |
1338 | next_pc += sizeof(struct binary_op); |
1339 | break; | |
1340 | } | |
1341 | ||
1342 | /* unary */ | |
1343 | case FILTER_OP_UNARY_PLUS: | |
1344 | case FILTER_OP_UNARY_MINUS: | |
3834b99f MD |
1345 | { |
1346 | /* Pop 1, push 1 */ | |
1347 | if (!vstack_ax(stack)) { | |
5a15f70c | 1348 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1349 | ret = -EINVAL; |
1350 | goto end; | |
1351 | } | |
1352 | switch (vstack_ax(stack)->type) { | |
1353 | case REG_S64: | |
1242217a | 1354 | case REG_U64: |
3834b99f MD |
1355 | case REG_TYPE_UNKNOWN: |
1356 | break; | |
1357 | default: | |
5a15f70c | 1358 | printk(KERN_WARNING "LTTng: filter: Unexpected register type %d for operation\n", |
3834b99f MD |
1359 | (int) vstack_ax(stack)->type); |
1360 | ret = -EINVAL; | |
1361 | goto end; | |
1362 | } | |
1363 | ||
1364 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; | |
1365 | next_pc += sizeof(struct unary_op); | |
1366 | break; | |
1367 | } | |
1368 | ||
07dfc1d0 MD |
1369 | case FILTER_OP_UNARY_PLUS_S64: |
1370 | case FILTER_OP_UNARY_MINUS_S64: | |
1371 | case FILTER_OP_UNARY_NOT_S64: | |
1372 | { | |
1373 | /* Pop 1, push 1 */ | |
1374 | if (!vstack_ax(stack)) { | |
5a15f70c | 1375 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1376 | ret = -EINVAL; |
1377 | goto end; | |
1378 | } | |
1379 | switch (vstack_ax(stack)->type) { | |
1380 | case REG_S64: | |
1242217a | 1381 | case REG_U64: |
3834b99f MD |
1382 | break; |
1383 | default: | |
5a15f70c | 1384 | printk(KERN_WARNING "LTTng: filter: Unexpected register type %d for operation\n", |
3834b99f MD |
1385 | (int) vstack_ax(stack)->type); |
1386 | ret = -EINVAL; | |
1387 | goto end; | |
1388 | } | |
1389 | ||
3834b99f MD |
1390 | next_pc += sizeof(struct unary_op); |
1391 | break; | |
1392 | } | |
1393 | ||
1394 | case FILTER_OP_UNARY_NOT: | |
1395 | { | |
1396 | /* Pop 1, push 1 */ | |
1397 | if (!vstack_ax(stack)) { | |
5a15f70c | 1398 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1399 | ret = -EINVAL; |
1400 | goto end; | |
1401 | } | |
1402 | switch (vstack_ax(stack)->type) { | |
1403 | case REG_S64: | |
1242217a | 1404 | case REG_U64: |
3834b99f MD |
1405 | case REG_TYPE_UNKNOWN: |
1406 | break; | |
1407 | default: | |
5a15f70c | 1408 | printk(KERN_WARNING "LTTng: filter: Unexpected register type %d for operation\n", |
e16c054b MD |
1409 | (int) vstack_ax(stack)->type); |
1410 | ret = -EINVAL; | |
1411 | goto end; | |
1412 | } | |
1413 | ||
e16c054b MD |
1414 | next_pc += sizeof(struct unary_op); |
1415 | break; | |
1416 | } | |
1417 | ||
1418 | case FILTER_OP_UNARY_BIT_NOT: | |
1419 | { | |
1420 | /* Pop 1, push 1 */ | |
1421 | if (!vstack_ax(stack)) { | |
5a15f70c | 1422 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
e16c054b MD |
1423 | ret = -EINVAL; |
1424 | goto end; | |
1425 | } | |
1426 | switch (vstack_ax(stack)->type) { | |
1427 | case REG_S64: | |
1242217a | 1428 | case REG_U64: |
e16c054b MD |
1429 | case REG_TYPE_UNKNOWN: |
1430 | break; | |
1431 | case REG_DOUBLE: | |
1432 | default: | |
5a15f70c | 1433 | printk(KERN_WARNING "LTTng: filter: Unexpected register type %d for operation\n", |
3834b99f | 1434 | (int) vstack_ax(stack)->type); |
07dfc1d0 MD |
1435 | ret = -EINVAL; |
1436 | goto end; | |
1437 | } | |
3834b99f | 1438 | |
1242217a | 1439 | vstack_ax(stack)->type = REG_U64; |
07dfc1d0 MD |
1440 | next_pc += sizeof(struct unary_op); |
1441 | break; | |
1442 | } | |
1443 | ||
1444 | /* logical */ | |
1445 | case FILTER_OP_AND: | |
1446 | case FILTER_OP_OR: | |
1447 | { | |
1448 | struct logical_op *insn = (struct logical_op *) pc; | |
1449 | int merge_ret; | |
1450 | ||
1451 | /* Add merge point to table */ | |
1452 | merge_ret = merge_point_add_check(mp_table, | |
1453 | insn->skip_offset, stack); | |
1454 | if (merge_ret) { | |
1455 | ret = merge_ret; | |
1456 | goto end; | |
1457 | } | |
3834b99f MD |
1458 | |
1459 | if (!vstack_ax(stack)) { | |
5a15f70c | 1460 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1461 | ret = -EINVAL; |
1462 | goto end; | |
1463 | } | |
1464 | /* There is always a cast-to-s64 operation before a or/and op. */ | |
1465 | switch (vstack_ax(stack)->type) { | |
1466 | case REG_S64: | |
1242217a | 1467 | case REG_U64: |
3834b99f MD |
1468 | break; |
1469 | default: | |
5a15f70c | 1470 | printk(KERN_WARNING "LTTng: filter: Incorrect register type %d for operation\n", |
3834b99f MD |
1471 | (int) vstack_ax(stack)->type); |
1472 | ret = -EINVAL; | |
1473 | goto end; | |
1474 | } | |
1475 | ||
07dfc1d0 MD |
1476 | /* Continue to next instruction */ |
1477 | /* Pop 1 when jump not taken */ | |
1478 | if (vstack_pop(stack)) { | |
1479 | ret = -EINVAL; | |
1480 | goto end; | |
1481 | } | |
1482 | next_pc += sizeof(struct logical_op); | |
1483 | break; | |
1484 | } | |
1485 | ||
1486 | /* load field ref */ | |
1487 | case FILTER_OP_LOAD_FIELD_REF: | |
1488 | { | |
5a15f70c | 1489 | printk(KERN_WARNING "LTTng: filter: Unknown field ref type\n"); |
07dfc1d0 MD |
1490 | ret = -EINVAL; |
1491 | goto end; | |
1492 | } | |
1493 | /* get context ref */ | |
1494 | case FILTER_OP_GET_CONTEXT_REF: | |
1495 | { | |
5a15f70c | 1496 | printk(KERN_WARNING "LTTng: filter: Unknown get context ref type\n"); |
07dfc1d0 MD |
1497 | ret = -EINVAL; |
1498 | goto end; | |
1499 | } | |
1500 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
1501 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
1502 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
f127e61e MD |
1503 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
1504 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
1505 | { |
1506 | if (vstack_push(stack)) { | |
1507 | ret = -EINVAL; | |
1508 | goto end; | |
1509 | } | |
1510 | vstack_ax(stack)->type = REG_STRING; | |
1511 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1512 | break; | |
1513 | } | |
1514 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
1515 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
1516 | { | |
1517 | if (vstack_push(stack)) { | |
1518 | ret = -EINVAL; | |
1519 | goto end; | |
1520 | } | |
1521 | vstack_ax(stack)->type = REG_S64; | |
1522 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1523 | break; | |
1524 | } | |
1525 | ||
1526 | /* load from immediate operand */ | |
1527 | case FILTER_OP_LOAD_STRING: | |
1528 | { | |
1529 | struct load_op *insn = (struct load_op *) pc; | |
1530 | ||
1531 | if (vstack_push(stack)) { | |
1532 | ret = -EINVAL; | |
1533 | goto end; | |
1534 | } | |
1535 | vstack_ax(stack)->type = REG_STRING; | |
1536 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
02aca193 PP |
1537 | break; |
1538 | } | |
1539 | ||
1540 | case FILTER_OP_LOAD_STAR_GLOB_STRING: | |
1541 | { | |
1542 | struct load_op *insn = (struct load_op *) pc; | |
1543 | ||
1544 | if (vstack_push(stack)) { | |
1545 | ret = -EINVAL; | |
1546 | goto end; | |
1547 | } | |
1548 | vstack_ax(stack)->type = REG_STAR_GLOB_STRING; | |
1549 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
07dfc1d0 MD |
1550 | break; |
1551 | } | |
1552 | ||
1553 | case FILTER_OP_LOAD_S64: | |
1554 | { | |
1555 | if (vstack_push(stack)) { | |
1556 | ret = -EINVAL; | |
1557 | goto end; | |
1558 | } | |
1559 | vstack_ax(stack)->type = REG_S64; | |
1560 | next_pc += sizeof(struct load_op) | |
1561 | + sizeof(struct literal_numeric); | |
1562 | break; | |
1563 | } | |
1564 | ||
1565 | case FILTER_OP_CAST_TO_S64: | |
1566 | { | |
1567 | /* Pop 1, push 1 */ | |
1568 | if (!vstack_ax(stack)) { | |
5a15f70c | 1569 | printk(KERN_WARNING "LTTng: filter: Empty stack\n"); |
07dfc1d0 MD |
1570 | ret = -EINVAL; |
1571 | goto end; | |
1572 | } | |
3834b99f MD |
1573 | switch (vstack_ax(stack)->type) { |
1574 | case REG_S64: | |
1242217a | 1575 | case REG_U64: |
3834b99f MD |
1576 | case REG_DOUBLE: |
1577 | case REG_TYPE_UNKNOWN: | |
1578 | break; | |
1579 | default: | |
5a15f70c | 1580 | printk(KERN_WARNING "LTTng: filter: Incorrect register type %d for cast\n", |
3834b99f MD |
1581 | (int) vstack_ax(stack)->type); |
1582 | ret = -EINVAL; | |
1583 | goto end; | |
1584 | } | |
07dfc1d0 MD |
1585 | vstack_ax(stack)->type = REG_S64; |
1586 | next_pc += sizeof(struct cast_op); | |
1587 | break; | |
1588 | } | |
1589 | case FILTER_OP_CAST_NOP: | |
1590 | { | |
1591 | next_pc += sizeof(struct cast_op); | |
1592 | break; | |
1593 | } | |
1594 | ||
3834b99f MD |
1595 | /* |
1596 | * Instructions for recursive traversal through composed types. | |
1597 | */ | |
1598 | case FILTER_OP_GET_CONTEXT_ROOT: | |
1599 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
1600 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
1601 | { | |
1602 | if (vstack_push(stack)) { | |
1603 | ret = -EINVAL; | |
1604 | goto end; | |
1605 | } | |
1606 | vstack_ax(stack)->type = REG_PTR; | |
1607 | next_pc += sizeof(struct load_op); | |
1608 | break; | |
1609 | } | |
1610 | ||
1611 | case FILTER_OP_LOAD_FIELD: | |
1612 | { | |
1613 | /* Pop 1, push 1 */ | |
1614 | if (!vstack_ax(stack)) { | |
5a15f70c | 1615 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1616 | ret = -EINVAL; |
1617 | goto end; | |
1618 | } | |
1619 | if (vstack_ax(stack)->type != REG_PTR) { | |
5a15f70c | 1620 | printk(KERN_WARNING "LTTng: filter: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1621 | ret = -EINVAL; |
1622 | goto end; | |
1623 | } | |
1624 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; | |
1625 | next_pc += sizeof(struct load_op); | |
1626 | break; | |
1627 | } | |
1628 | ||
1629 | case FILTER_OP_LOAD_FIELD_S8: | |
1630 | case FILTER_OP_LOAD_FIELD_S16: | |
1631 | case FILTER_OP_LOAD_FIELD_S32: | |
1632 | case FILTER_OP_LOAD_FIELD_S64: | |
1242217a FD |
1633 | { |
1634 | /* Pop 1, push 1 */ | |
1635 | if (!vstack_ax(stack)) { | |
1636 | printk(KERN_WARNING "Empty stack\n\n"); | |
1637 | ret = -EINVAL; | |
1638 | goto end; | |
1639 | } | |
1640 | if (vstack_ax(stack)->type != REG_PTR) { | |
1641 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1642 | ret = -EINVAL; | |
1643 | goto end; | |
1644 | } | |
1645 | vstack_ax(stack)->type = REG_S64; | |
1646 | next_pc += sizeof(struct load_op); | |
1647 | break; | |
1648 | } | |
3834b99f MD |
1649 | case FILTER_OP_LOAD_FIELD_U8: |
1650 | case FILTER_OP_LOAD_FIELD_U16: | |
1651 | case FILTER_OP_LOAD_FIELD_U32: | |
1652 | case FILTER_OP_LOAD_FIELD_U64: | |
1653 | { | |
1654 | /* Pop 1, push 1 */ | |
1655 | if (!vstack_ax(stack)) { | |
5a15f70c | 1656 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1657 | ret = -EINVAL; |
1658 | goto end; | |
1659 | } | |
1660 | if (vstack_ax(stack)->type != REG_PTR) { | |
5a15f70c | 1661 | printk(KERN_WARNING "LTTng: filter: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1662 | ret = -EINVAL; |
1663 | goto end; | |
1664 | } | |
1242217a | 1665 | vstack_ax(stack)->type = REG_U64; |
3834b99f MD |
1666 | next_pc += sizeof(struct load_op); |
1667 | break; | |
1668 | } | |
3834b99f MD |
1669 | case FILTER_OP_LOAD_FIELD_STRING: |
1670 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
1671 | { | |
1672 | /* Pop 1, push 1 */ | |
1673 | if (!vstack_ax(stack)) { | |
5a15f70c | 1674 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1675 | ret = -EINVAL; |
1676 | goto end; | |
1677 | } | |
1678 | if (vstack_ax(stack)->type != REG_PTR) { | |
5a15f70c | 1679 | printk(KERN_WARNING "LTTng: filter: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1680 | ret = -EINVAL; |
1681 | goto end; | |
1682 | } | |
1683 | vstack_ax(stack)->type = REG_STRING; | |
1684 | next_pc += sizeof(struct load_op); | |
1685 | break; | |
1686 | } | |
1687 | ||
1688 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
1689 | { | |
1690 | /* Pop 1, push 1 */ | |
1691 | if (!vstack_ax(stack)) { | |
5a15f70c | 1692 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1693 | ret = -EINVAL; |
1694 | goto end; | |
1695 | } | |
1696 | if (vstack_ax(stack)->type != REG_PTR) { | |
5a15f70c | 1697 | printk(KERN_WARNING "LTTng: filter: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1698 | ret = -EINVAL; |
1699 | goto end; | |
1700 | } | |
1701 | vstack_ax(stack)->type = REG_DOUBLE; | |
1702 | next_pc += sizeof(struct load_op); | |
1703 | break; | |
1704 | } | |
1705 | ||
1706 | case FILTER_OP_GET_SYMBOL: | |
1707 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1708 | { | |
1709 | /* Pop 1, push 1 */ | |
1710 | if (!vstack_ax(stack)) { | |
5a15f70c | 1711 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1712 | ret = -EINVAL; |
1713 | goto end; | |
1714 | } | |
1715 | if (vstack_ax(stack)->type != REG_PTR) { | |
5a15f70c | 1716 | printk(KERN_WARNING "LTTng: filter: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1717 | ret = -EINVAL; |
1718 | goto end; | |
1719 | } | |
1720 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); | |
1721 | break; | |
1722 | } | |
1723 | ||
1724 | case FILTER_OP_GET_INDEX_U16: | |
1725 | { | |
1726 | /* Pop 1, push 1 */ | |
1727 | if (!vstack_ax(stack)) { | |
5a15f70c | 1728 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1729 | ret = -EINVAL; |
1730 | goto end; | |
1731 | } | |
1732 | if (vstack_ax(stack)->type != REG_PTR) { | |
5a15f70c | 1733 | printk(KERN_WARNING "LTTng: filter: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1734 | ret = -EINVAL; |
1735 | goto end; | |
1736 | } | |
1737 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); | |
1738 | break; | |
1739 | } | |
1740 | ||
1741 | case FILTER_OP_GET_INDEX_U64: | |
1742 | { | |
1743 | /* Pop 1, push 1 */ | |
1744 | if (!vstack_ax(stack)) { | |
5a15f70c | 1745 | printk(KERN_WARNING "LTTng: filter: Empty stack\n\n"); |
3834b99f MD |
1746 | ret = -EINVAL; |
1747 | goto end; | |
1748 | } | |
1749 | if (vstack_ax(stack)->type != REG_PTR) { | |
5a15f70c | 1750 | printk(KERN_WARNING "LTTng: filter: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1751 | ret = -EINVAL; |
1752 | goto end; | |
1753 | } | |
1754 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); | |
1755 | break; | |
1756 | } | |
1757 | ||
07dfc1d0 MD |
1758 | } |
1759 | end: | |
1760 | *_next_pc = next_pc; | |
1761 | return ret; | |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * Never called concurrently (hash seed is shared). | |
1766 | */ | |
1767 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) | |
1768 | { | |
1769 | struct mp_table *mp_table; | |
7962cb86 | 1770 | char *pc, *next_pc, *start_pc; |
07dfc1d0 MD |
1771 | int ret = -EINVAL; |
1772 | struct vstack stack; | |
1773 | ||
1774 | vstack_init(&stack); | |
1775 | ||
1776 | mp_table = kzalloc(sizeof(*mp_table), GFP_KERNEL); | |
1777 | if (!mp_table) { | |
5a15f70c | 1778 | printk(KERN_WARNING "LTTng: filter: Error allocating hash table for bytecode validation\n"); |
07dfc1d0 MD |
1779 | return -ENOMEM; |
1780 | } | |
3834b99f | 1781 | start_pc = &bytecode->code[0]; |
07dfc1d0 MD |
1782 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
1783 | pc = next_pc) { | |
1784 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); | |
1785 | if (ret != 0) { | |
1786 | if (ret == -ERANGE) | |
5a15f70c | 1787 | printk(KERN_WARNING "LTTng: filter: filter bytecode overflow\n"); |
07dfc1d0 MD |
1788 | goto end; |
1789 | } | |
1790 | dbg_printk("Validating op %s (%u)\n", | |
1791 | lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), | |
1792 | (unsigned int) *(filter_opcode_t *) pc); | |
1793 | ||
1794 | /* | |
1795 | * For each instruction, validate the current context | |
1796 | * (traversal of entire execution flow), and validate | |
3834b99f | 1797 | * all merge points targeting this instruction. |
07dfc1d0 MD |
1798 | */ |
1799 | ret = validate_instruction_all_contexts(bytecode, mp_table, | |
1800 | &stack, start_pc, pc); | |
1801 | if (ret) | |
1802 | goto end; | |
1803 | ret = exec_insn(bytecode, mp_table, &stack, &next_pc, pc); | |
1804 | if (ret <= 0) | |
1805 | goto end; | |
1806 | } | |
1807 | end: | |
1808 | if (delete_all_nodes(mp_table)) { | |
1809 | if (!ret) { | |
5a15f70c | 1810 | printk(KERN_WARNING "LTTng: filter: Unexpected merge points\n"); |
07dfc1d0 MD |
1811 | ret = -EINVAL; |
1812 | } | |
1813 | } | |
1814 | kfree(mp_table); | |
1815 | return ret; | |
1816 | } |