Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: MIT |
2 | * | |
07dfc1d0 MD |
3 | * lttng-filter-validator.c |
4 | * | |
5 | * LTTng modules filter bytecode validator. | |
6 | * | |
bbf3aef5 | 7 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
07dfc1d0 MD |
8 | */ |
9 | ||
499cc3f7 | 10 | #include <linux/types.h> |
07dfc1d0 MD |
11 | #include <linux/jhash.h> |
12 | #include <linux/slab.h> | |
13 | ||
241ae9a8 MD |
14 | #include <wrapper/list.h> |
15 | #include <lttng-filter.h> | |
07dfc1d0 MD |
16 | |
17 | #define MERGE_POINT_TABLE_BITS 7 | |
18 | #define MERGE_POINT_TABLE_SIZE (1U << MERGE_POINT_TABLE_BITS) | |
19 | ||
20 | /* merge point table node */ | |
21 | struct mp_node { | |
22 | struct hlist_node node; | |
23 | ||
24 | /* Context at merge point */ | |
25 | struct vstack stack; | |
26 | unsigned long target_pc; | |
27 | }; | |
28 | ||
29 | struct mp_table { | |
30 | struct hlist_head mp_head[MERGE_POINT_TABLE_SIZE]; | |
31 | }; | |
32 | ||
33 | static | |
34 | int lttng_hash_match(struct mp_node *mp_node, unsigned long key_pc) | |
35 | { | |
36 | if (mp_node->target_pc == key_pc) | |
37 | return 1; | |
38 | else | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static | |
43 | int merge_points_compare(const struct vstack *stacka, | |
44 | const struct vstack *stackb) | |
45 | { | |
46 | int i, len; | |
47 | ||
48 | if (stacka->top != stackb->top) | |
49 | return 1; | |
50 | len = stacka->top + 1; | |
51 | WARN_ON_ONCE(len < 0); | |
52 | for (i = 0; i < len; i++) { | |
53 | if (stacka->e[i].type != stackb->e[i].type) | |
54 | return 1; | |
55 | } | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static | |
60 | int merge_point_add_check(struct mp_table *mp_table, unsigned long target_pc, | |
61 | const struct vstack *stack) | |
62 | { | |
63 | struct mp_node *mp_node; | |
64 | unsigned long hash = jhash_1word(target_pc, 0); | |
65 | struct hlist_head *head; | |
66 | struct mp_node *lookup_node; | |
67 | int found = 0; | |
68 | ||
69 | dbg_printk("Filter: adding merge point at offset %lu, hash %lu\n", | |
70 | target_pc, hash); | |
71 | mp_node = kzalloc(sizeof(struct mp_node), GFP_KERNEL); | |
72 | if (!mp_node) | |
73 | return -ENOMEM; | |
74 | mp_node->target_pc = target_pc; | |
75 | memcpy(&mp_node->stack, stack, sizeof(mp_node->stack)); | |
76 | ||
77 | head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)]; | |
d216ecae | 78 | lttng_hlist_for_each_entry(lookup_node, head, node) { |
07dfc1d0 MD |
79 | if (lttng_hash_match(lookup_node, target_pc)) { |
80 | found = 1; | |
81 | break; | |
82 | } | |
83 | } | |
84 | if (found) { | |
85 | /* Key already present */ | |
86 | dbg_printk("Filter: compare merge points for offset %lu, hash %lu\n", | |
87 | target_pc, hash); | |
88 | kfree(mp_node); | |
89 | if (merge_points_compare(stack, &lookup_node->stack)) { | |
90 | printk(KERN_WARNING "Merge points differ for offset %lu\n", | |
91 | target_pc); | |
92 | return -EINVAL; | |
93 | } | |
5e13eb3c MD |
94 | } else { |
95 | hlist_add_head(&mp_node->node, head); | |
07dfc1d0 | 96 | } |
07dfc1d0 MD |
97 | return 0; |
98 | } | |
99 | ||
100 | /* | |
101 | * Binary comparators use top of stack and top of stack -1. | |
102 | */ | |
103 | static | |
02aca193 PP |
104 | int bin_op_compare_check(struct vstack *stack, const filter_opcode_t opcode, |
105 | const char *str) | |
07dfc1d0 MD |
106 | { |
107 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) | |
3834b99f | 108 | goto error_empty; |
07dfc1d0 MD |
109 | |
110 | switch (vstack_ax(stack)->type) { | |
111 | default: | |
112 | case REG_DOUBLE: | |
3834b99f | 113 | goto error_type; |
07dfc1d0 MD |
114 | |
115 | case REG_STRING: | |
116 | switch (vstack_bx(stack)->type) { | |
117 | default: | |
118 | case REG_DOUBLE: | |
3834b99f MD |
119 | goto error_type; |
120 | case REG_TYPE_UNKNOWN: | |
121 | goto unknown; | |
07dfc1d0 MD |
122 | case REG_STRING: |
123 | break; | |
02aca193 PP |
124 | case REG_STAR_GLOB_STRING: |
125 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { | |
126 | goto error_mismatch; | |
127 | } | |
128 | break; | |
129 | case REG_S64: | |
130 | goto error_mismatch; | |
131 | } | |
132 | break; | |
133 | case REG_STAR_GLOB_STRING: | |
134 | switch (vstack_bx(stack)->type) { | |
135 | default: | |
136 | case REG_DOUBLE: | |
3834b99f MD |
137 | goto error_type; |
138 | case REG_TYPE_UNKNOWN: | |
139 | goto unknown; | |
02aca193 PP |
140 | case REG_STRING: |
141 | if (opcode != FILTER_OP_EQ && opcode != FILTER_OP_NE) { | |
142 | goto error_mismatch; | |
143 | } | |
144 | break; | |
145 | case REG_STAR_GLOB_STRING: | |
07dfc1d0 MD |
146 | case REG_S64: |
147 | goto error_mismatch; | |
148 | } | |
149 | break; | |
150 | case REG_S64: | |
151 | switch (vstack_bx(stack)->type) { | |
152 | default: | |
153 | case REG_DOUBLE: | |
3834b99f MD |
154 | goto error_type; |
155 | case REG_TYPE_UNKNOWN: | |
156 | goto unknown; | |
07dfc1d0 | 157 | case REG_STRING: |
02aca193 | 158 | case REG_STAR_GLOB_STRING: |
07dfc1d0 | 159 | goto error_mismatch; |
07dfc1d0 MD |
160 | case REG_S64: |
161 | break; | |
162 | } | |
163 | break; | |
3834b99f MD |
164 | case REG_TYPE_UNKNOWN: |
165 | switch (vstack_bx(stack)->type) { | |
166 | default: | |
167 | case REG_DOUBLE: | |
168 | goto error_type; | |
169 | case REG_TYPE_UNKNOWN: | |
170 | case REG_STRING: | |
171 | case REG_STAR_GLOB_STRING: | |
172 | case REG_S64: | |
173 | goto unknown; | |
174 | } | |
175 | break; | |
07dfc1d0 MD |
176 | } |
177 | return 0; | |
178 | ||
3834b99f MD |
179 | unknown: |
180 | return 1; | |
181 | ||
182 | error_empty: | |
183 | printk(KERN_WARNING "empty stack for '%s' binary operator\n", str); | |
07dfc1d0 MD |
184 | return -EINVAL; |
185 | ||
186 | error_mismatch: | |
187 | printk(KERN_WARNING "type mismatch for '%s' binary operator\n", str); | |
188 | return -EINVAL; | |
3834b99f MD |
189 | |
190 | error_type: | |
191 | printk(KERN_WARNING "unknown type for '%s' binary operator\n", str); | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Binary bitwise operators use top of stack and top of stack -1. | |
197 | * Return 0 if typing is known to match, 1 if typing is dynamic | |
198 | * (unknown), negative error value on error. | |
199 | */ | |
200 | static | |
201 | int bin_op_bitwise_check(struct vstack *stack, filter_opcode_t opcode, | |
202 | const char *str) | |
203 | { | |
204 | if (unlikely(!vstack_ax(stack) || !vstack_bx(stack))) | |
205 | goto error_empty; | |
206 | ||
207 | switch (vstack_ax(stack)->type) { | |
208 | default: | |
209 | case REG_DOUBLE: | |
210 | goto error_type; | |
211 | ||
212 | case REG_TYPE_UNKNOWN: | |
213 | switch (vstack_bx(stack)->type) { | |
214 | default: | |
215 | case REG_DOUBLE: | |
216 | goto error_type; | |
217 | case REG_TYPE_UNKNOWN: | |
218 | case REG_STRING: | |
219 | case REG_STAR_GLOB_STRING: | |
220 | case REG_S64: | |
221 | goto unknown; | |
222 | } | |
223 | break; | |
224 | case REG_S64: | |
225 | switch (vstack_bx(stack)->type) { | |
226 | default: | |
227 | case REG_DOUBLE: | |
228 | goto error_type; | |
229 | case REG_TYPE_UNKNOWN: | |
230 | goto unknown; | |
231 | case REG_S64: | |
232 | break; | |
233 | } | |
234 | break; | |
235 | } | |
236 | return 0; | |
237 | ||
238 | unknown: | |
239 | return 1; | |
240 | ||
241 | error_empty: | |
242 | printk(KERN_WARNING "empty stack for '%s' binary operator\n", str); | |
243 | return -EINVAL; | |
244 | ||
245 | error_type: | |
246 | printk(KERN_WARNING "unknown type for '%s' binary operator\n", str); | |
247 | return -EINVAL; | |
248 | } | |
249 | ||
250 | static | |
251 | int validate_get_symbol(struct bytecode_runtime *bytecode, | |
252 | const struct get_symbol *sym) | |
253 | { | |
254 | const char *str, *str_limit; | |
255 | size_t len_limit; | |
256 | ||
257 | if (sym->offset >= bytecode->p.bc->bc.len - bytecode->p.bc->bc.reloc_offset) | |
258 | return -EINVAL; | |
259 | ||
260 | str = bytecode->p.bc->bc.data + bytecode->p.bc->bc.reloc_offset + sym->offset; | |
261 | str_limit = bytecode->p.bc->bc.data + bytecode->p.bc->bc.len; | |
262 | len_limit = str_limit - str; | |
263 | if (strnlen(str, len_limit) == len_limit) | |
264 | return -EINVAL; | |
265 | return 0; | |
07dfc1d0 MD |
266 | } |
267 | ||
268 | /* | |
269 | * Validate bytecode range overflow within the validation pass. | |
270 | * Called for each instruction encountered. | |
271 | */ | |
272 | static | |
273 | int bytecode_validate_overflow(struct bytecode_runtime *bytecode, | |
7962cb86 | 274 | char *start_pc, char *pc) |
07dfc1d0 MD |
275 | { |
276 | int ret = 0; | |
277 | ||
278 | switch (*(filter_opcode_t *) pc) { | |
279 | case FILTER_OP_UNKNOWN: | |
280 | default: | |
281 | { | |
282 | printk(KERN_WARNING "unknown bytecode op %u\n", | |
283 | (unsigned int) *(filter_opcode_t *) pc); | |
284 | ret = -EINVAL; | |
285 | break; | |
286 | } | |
287 | ||
288 | case FILTER_OP_RETURN: | |
57ba4b41 | 289 | case FILTER_OP_RETURN_S64: |
07dfc1d0 MD |
290 | { |
291 | if (unlikely(pc + sizeof(struct return_op) | |
292 | > start_pc + bytecode->len)) { | |
293 | ret = -ERANGE; | |
294 | } | |
295 | break; | |
296 | } | |
297 | ||
298 | /* binary */ | |
299 | case FILTER_OP_MUL: | |
300 | case FILTER_OP_DIV: | |
301 | case FILTER_OP_MOD: | |
302 | case FILTER_OP_PLUS: | |
303 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
304 | case FILTER_OP_EQ_DOUBLE: |
305 | case FILTER_OP_NE_DOUBLE: | |
306 | case FILTER_OP_GT_DOUBLE: | |
307 | case FILTER_OP_LT_DOUBLE: | |
308 | case FILTER_OP_GE_DOUBLE: | |
309 | case FILTER_OP_LE_DOUBLE: | |
310 | /* Floating point */ | |
311 | case FILTER_OP_EQ_DOUBLE_S64: | |
312 | case FILTER_OP_NE_DOUBLE_S64: | |
313 | case FILTER_OP_GT_DOUBLE_S64: | |
314 | case FILTER_OP_LT_DOUBLE_S64: | |
315 | case FILTER_OP_GE_DOUBLE_S64: | |
316 | case FILTER_OP_LE_DOUBLE_S64: | |
317 | case FILTER_OP_EQ_S64_DOUBLE: | |
318 | case FILTER_OP_NE_S64_DOUBLE: | |
319 | case FILTER_OP_GT_S64_DOUBLE: | |
320 | case FILTER_OP_LT_S64_DOUBLE: | |
321 | case FILTER_OP_GE_S64_DOUBLE: | |
322 | case FILTER_OP_LE_S64_DOUBLE: | |
323 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
324 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
325 | case FILTER_OP_LOAD_DOUBLE: | |
326 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
327 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
328 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
329 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
330 | { | |
331 | printk(KERN_WARNING "unsupported bytecode op %u\n", | |
332 | (unsigned int) *(filter_opcode_t *) pc); | |
333 | ret = -EINVAL; | |
334 | break; | |
335 | } | |
336 | ||
337 | case FILTER_OP_EQ: | |
338 | case FILTER_OP_NE: | |
339 | case FILTER_OP_GT: | |
340 | case FILTER_OP_LT: | |
341 | case FILTER_OP_GE: | |
342 | case FILTER_OP_LE: | |
343 | case FILTER_OP_EQ_STRING: | |
344 | case FILTER_OP_NE_STRING: | |
345 | case FILTER_OP_GT_STRING: | |
346 | case FILTER_OP_LT_STRING: | |
347 | case FILTER_OP_GE_STRING: | |
348 | case FILTER_OP_LE_STRING: | |
02aca193 PP |
349 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
350 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
07dfc1d0 MD |
351 | case FILTER_OP_EQ_S64: |
352 | case FILTER_OP_NE_S64: | |
353 | case FILTER_OP_GT_S64: | |
354 | case FILTER_OP_LT_S64: | |
355 | case FILTER_OP_GE_S64: | |
356 | case FILTER_OP_LE_S64: | |
e16c054b MD |
357 | case FILTER_OP_BIT_RSHIFT: |
358 | case FILTER_OP_BIT_LSHIFT: | |
3834b99f MD |
359 | case FILTER_OP_BIT_AND: |
360 | case FILTER_OP_BIT_OR: | |
361 | case FILTER_OP_BIT_XOR: | |
07dfc1d0 MD |
362 | { |
363 | if (unlikely(pc + sizeof(struct binary_op) | |
364 | > start_pc + bytecode->len)) { | |
365 | ret = -ERANGE; | |
366 | } | |
367 | break; | |
368 | } | |
369 | ||
370 | /* unary */ | |
371 | case FILTER_OP_UNARY_PLUS: | |
372 | case FILTER_OP_UNARY_MINUS: | |
373 | case FILTER_OP_UNARY_NOT: | |
374 | case FILTER_OP_UNARY_PLUS_S64: | |
375 | case FILTER_OP_UNARY_MINUS_S64: | |
376 | case FILTER_OP_UNARY_NOT_S64: | |
e16c054b | 377 | case FILTER_OP_UNARY_BIT_NOT: |
07dfc1d0 MD |
378 | { |
379 | if (unlikely(pc + sizeof(struct unary_op) | |
380 | > start_pc + bytecode->len)) { | |
381 | ret = -ERANGE; | |
382 | } | |
383 | break; | |
384 | } | |
385 | ||
386 | /* logical */ | |
387 | case FILTER_OP_AND: | |
388 | case FILTER_OP_OR: | |
389 | { | |
390 | if (unlikely(pc + sizeof(struct logical_op) | |
391 | > start_pc + bytecode->len)) { | |
392 | ret = -ERANGE; | |
393 | } | |
394 | break; | |
395 | } | |
396 | ||
ce5579a7 | 397 | /* load field and get context ref */ |
07dfc1d0 | 398 | case FILTER_OP_LOAD_FIELD_REF: |
07dfc1d0 | 399 | case FILTER_OP_GET_CONTEXT_REF: |
07dfc1d0 MD |
400 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
401 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
f127e61e MD |
402 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
403 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
404 | case FILTER_OP_LOAD_FIELD_REF_S64: |
405 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
406 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
407 | { | |
408 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) | |
409 | > start_pc + bytecode->len)) { | |
410 | ret = -ERANGE; | |
411 | } | |
412 | break; | |
413 | } | |
414 | ||
415 | /* load from immediate operand */ | |
416 | case FILTER_OP_LOAD_STRING: | |
02aca193 | 417 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
07dfc1d0 MD |
418 | { |
419 | struct load_op *insn = (struct load_op *) pc; | |
420 | uint32_t str_len, maxlen; | |
421 | ||
422 | if (unlikely(pc + sizeof(struct load_op) | |
423 | > start_pc + bytecode->len)) { | |
424 | ret = -ERANGE; | |
425 | break; | |
426 | } | |
427 | ||
428 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); | |
429 | str_len = strnlen(insn->data, maxlen); | |
430 | if (unlikely(str_len >= maxlen)) { | |
431 | /* Final '\0' not found within range */ | |
432 | ret = -ERANGE; | |
433 | } | |
434 | break; | |
435 | } | |
436 | ||
437 | case FILTER_OP_LOAD_S64: | |
438 | { | |
439 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) | |
440 | > start_pc + bytecode->len)) { | |
441 | ret = -ERANGE; | |
442 | } | |
443 | break; | |
444 | } | |
445 | ||
446 | case FILTER_OP_CAST_TO_S64: | |
447 | case FILTER_OP_CAST_NOP: | |
448 | { | |
449 | if (unlikely(pc + sizeof(struct cast_op) | |
450 | > start_pc + bytecode->len)) { | |
451 | ret = -ERANGE; | |
452 | } | |
453 | break; | |
454 | } | |
455 | ||
3834b99f MD |
456 | /* |
457 | * Instructions for recursive traversal through composed types. | |
458 | */ | |
459 | case FILTER_OP_GET_CONTEXT_ROOT: | |
460 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
461 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
462 | case FILTER_OP_LOAD_FIELD: | |
463 | case FILTER_OP_LOAD_FIELD_S8: | |
464 | case FILTER_OP_LOAD_FIELD_S16: | |
465 | case FILTER_OP_LOAD_FIELD_S32: | |
466 | case FILTER_OP_LOAD_FIELD_S64: | |
467 | case FILTER_OP_LOAD_FIELD_U8: | |
468 | case FILTER_OP_LOAD_FIELD_U16: | |
469 | case FILTER_OP_LOAD_FIELD_U32: | |
470 | case FILTER_OP_LOAD_FIELD_U64: | |
471 | case FILTER_OP_LOAD_FIELD_STRING: | |
472 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
473 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
474 | if (unlikely(pc + sizeof(struct load_op) | |
475 | > start_pc + bytecode->len)) { | |
476 | ret = -ERANGE; | |
477 | } | |
478 | break; | |
479 | ||
480 | case FILTER_OP_GET_SYMBOL: | |
481 | { | |
482 | struct load_op *insn = (struct load_op *) pc; | |
483 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
484 | ||
485 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol) | |
486 | > start_pc + bytecode->len)) { | |
487 | ret = -ERANGE; | |
3aeca857 | 488 | break; |
3834b99f MD |
489 | } |
490 | ret = validate_get_symbol(bytecode, sym); | |
491 | break; | |
492 | } | |
493 | ||
494 | case FILTER_OP_GET_SYMBOL_FIELD: | |
495 | printk(KERN_WARNING "Unexpected get symbol field\n"); | |
496 | ret = -EINVAL; | |
497 | break; | |
498 | ||
499 | case FILTER_OP_GET_INDEX_U16: | |
500 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16) | |
501 | > start_pc + bytecode->len)) { | |
502 | ret = -ERANGE; | |
503 | } | |
504 | break; | |
505 | ||
506 | case FILTER_OP_GET_INDEX_U64: | |
507 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64) | |
508 | > start_pc + bytecode->len)) { | |
509 | ret = -ERANGE; | |
510 | } | |
511 | break; | |
07dfc1d0 MD |
512 | } |
513 | ||
514 | return ret; | |
515 | } | |
516 | ||
517 | static | |
518 | unsigned long delete_all_nodes(struct mp_table *mp_table) | |
519 | { | |
520 | struct mp_node *mp_node; | |
521 | struct hlist_node *tmp; | |
522 | unsigned long nr_nodes = 0; | |
523 | int i; | |
524 | ||
525 | for (i = 0; i < MERGE_POINT_TABLE_SIZE; i++) { | |
526 | struct hlist_head *head; | |
527 | ||
528 | head = &mp_table->mp_head[i]; | |
d216ecae | 529 | lttng_hlist_for_each_entry_safe(mp_node, tmp, head, node) { |
07dfc1d0 MD |
530 | kfree(mp_node); |
531 | nr_nodes++; | |
532 | } | |
533 | } | |
534 | return nr_nodes; | |
535 | } | |
536 | ||
537 | /* | |
538 | * Return value: | |
3834b99f | 539 | * >=0: success |
07dfc1d0 MD |
540 | * <0: error |
541 | */ | |
542 | static | |
543 | int validate_instruction_context(struct bytecode_runtime *bytecode, | |
544 | struct vstack *stack, | |
7962cb86 MD |
545 | char *start_pc, |
546 | char *pc) | |
07dfc1d0 MD |
547 | { |
548 | int ret = 0; | |
02aca193 | 549 | const filter_opcode_t opcode = *(filter_opcode_t *) pc; |
07dfc1d0 | 550 | |
02aca193 | 551 | switch (opcode) { |
07dfc1d0 MD |
552 | case FILTER_OP_UNKNOWN: |
553 | default: | |
554 | { | |
555 | printk(KERN_WARNING "unknown bytecode op %u\n", | |
556 | (unsigned int) *(filter_opcode_t *) pc); | |
557 | ret = -EINVAL; | |
558 | goto end; | |
559 | } | |
560 | ||
561 | case FILTER_OP_RETURN: | |
57ba4b41 | 562 | case FILTER_OP_RETURN_S64: |
07dfc1d0 MD |
563 | { |
564 | goto end; | |
565 | } | |
566 | ||
567 | /* binary */ | |
568 | case FILTER_OP_MUL: | |
569 | case FILTER_OP_DIV: | |
570 | case FILTER_OP_MOD: | |
571 | case FILTER_OP_PLUS: | |
572 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
573 | /* Floating point */ |
574 | case FILTER_OP_EQ_DOUBLE: | |
575 | case FILTER_OP_NE_DOUBLE: | |
576 | case FILTER_OP_GT_DOUBLE: | |
577 | case FILTER_OP_LT_DOUBLE: | |
578 | case FILTER_OP_GE_DOUBLE: | |
579 | case FILTER_OP_LE_DOUBLE: | |
580 | case FILTER_OP_EQ_DOUBLE_S64: | |
581 | case FILTER_OP_NE_DOUBLE_S64: | |
582 | case FILTER_OP_GT_DOUBLE_S64: | |
583 | case FILTER_OP_LT_DOUBLE_S64: | |
584 | case FILTER_OP_GE_DOUBLE_S64: | |
585 | case FILTER_OP_LE_DOUBLE_S64: | |
586 | case FILTER_OP_EQ_S64_DOUBLE: | |
587 | case FILTER_OP_NE_S64_DOUBLE: | |
588 | case FILTER_OP_GT_S64_DOUBLE: | |
589 | case FILTER_OP_LT_S64_DOUBLE: | |
590 | case FILTER_OP_GE_S64_DOUBLE: | |
591 | case FILTER_OP_LE_S64_DOUBLE: | |
592 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
593 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
594 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
595 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
596 | case FILTER_OP_LOAD_DOUBLE: | |
597 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
598 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
599 | { | |
600 | printk(KERN_WARNING "unsupported bytecode op %u\n", | |
601 | (unsigned int) *(filter_opcode_t *) pc); | |
602 | ret = -EINVAL; | |
603 | goto end; | |
604 | } | |
605 | ||
606 | case FILTER_OP_EQ: | |
607 | { | |
02aca193 | 608 | ret = bin_op_compare_check(stack, opcode, "=="); |
3834b99f | 609 | if (ret < 0) |
07dfc1d0 MD |
610 | goto end; |
611 | break; | |
612 | } | |
613 | case FILTER_OP_NE: | |
614 | { | |
02aca193 | 615 | ret = bin_op_compare_check(stack, opcode, "!="); |
3834b99f | 616 | if (ret < 0) |
07dfc1d0 MD |
617 | goto end; |
618 | break; | |
619 | } | |
620 | case FILTER_OP_GT: | |
621 | { | |
02aca193 | 622 | ret = bin_op_compare_check(stack, opcode, ">"); |
3834b99f | 623 | if (ret < 0) |
07dfc1d0 MD |
624 | goto end; |
625 | break; | |
626 | } | |
627 | case FILTER_OP_LT: | |
628 | { | |
02aca193 | 629 | ret = bin_op_compare_check(stack, opcode, "<"); |
3834b99f | 630 | if (ret < 0) |
07dfc1d0 MD |
631 | goto end; |
632 | break; | |
633 | } | |
634 | case FILTER_OP_GE: | |
635 | { | |
02aca193 | 636 | ret = bin_op_compare_check(stack, opcode, ">="); |
3834b99f | 637 | if (ret < 0) |
07dfc1d0 MD |
638 | goto end; |
639 | break; | |
640 | } | |
641 | case FILTER_OP_LE: | |
642 | { | |
02aca193 | 643 | ret = bin_op_compare_check(stack, opcode, "<="); |
3834b99f | 644 | if (ret < 0) |
07dfc1d0 MD |
645 | goto end; |
646 | break; | |
647 | } | |
648 | ||
649 | case FILTER_OP_EQ_STRING: | |
650 | case FILTER_OP_NE_STRING: | |
651 | case FILTER_OP_GT_STRING: | |
652 | case FILTER_OP_LT_STRING: | |
653 | case FILTER_OP_GE_STRING: | |
654 | case FILTER_OP_LE_STRING: | |
655 | { | |
656 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
657 | printk(KERN_WARNING "Empty stack\n"); | |
658 | ret = -EINVAL; | |
659 | goto end; | |
660 | } | |
661 | if (vstack_ax(stack)->type != REG_STRING | |
662 | || vstack_bx(stack)->type != REG_STRING) { | |
663 | printk(KERN_WARNING "Unexpected register type for string comparator\n"); | |
664 | ret = -EINVAL; | |
665 | goto end; | |
666 | } | |
667 | break; | |
668 | } | |
669 | ||
02aca193 PP |
670 | |
671 | case FILTER_OP_EQ_STAR_GLOB_STRING: | |
672 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
673 | { | |
674 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
675 | printk(KERN_WARNING "Empty stack\n"); | |
676 | ret = -EINVAL; | |
677 | goto end; | |
678 | } | |
679 | if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING | |
680 | && vstack_bx(stack)->type != REG_STAR_GLOB_STRING) { | |
681 | printk(KERN_WARNING "Unexpected register type for globbing pattern comparator\n"); | |
682 | ret = -EINVAL; | |
683 | goto end; | |
684 | } | |
685 | break; | |
686 | } | |
687 | ||
07dfc1d0 MD |
688 | case FILTER_OP_EQ_S64: |
689 | case FILTER_OP_NE_S64: | |
690 | case FILTER_OP_GT_S64: | |
691 | case FILTER_OP_LT_S64: | |
692 | case FILTER_OP_GE_S64: | |
693 | case FILTER_OP_LE_S64: | |
694 | { | |
695 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
696 | printk(KERN_WARNING "Empty stack\n"); | |
697 | ret = -EINVAL; | |
698 | goto end; | |
699 | } | |
700 | if (vstack_ax(stack)->type != REG_S64 | |
701 | || vstack_bx(stack)->type != REG_S64) { | |
702 | printk(KERN_WARNING "Unexpected register type for s64 comparator\n"); | |
703 | ret = -EINVAL; | |
704 | goto end; | |
705 | } | |
706 | break; | |
707 | } | |
708 | ||
e16c054b MD |
709 | case FILTER_OP_BIT_RSHIFT: |
710 | ret = bin_op_bitwise_check(stack, opcode, ">>"); | |
711 | if (ret < 0) | |
712 | goto end; | |
713 | break; | |
714 | case FILTER_OP_BIT_LSHIFT: | |
715 | ret = bin_op_bitwise_check(stack, opcode, "<<"); | |
716 | if (ret < 0) | |
717 | goto end; | |
718 | break; | |
3834b99f MD |
719 | case FILTER_OP_BIT_AND: |
720 | ret = bin_op_bitwise_check(stack, opcode, "&"); | |
721 | if (ret < 0) | |
722 | goto end; | |
723 | break; | |
724 | case FILTER_OP_BIT_OR: | |
725 | ret = bin_op_bitwise_check(stack, opcode, "|"); | |
726 | if (ret < 0) | |
727 | goto end; | |
728 | break; | |
729 | case FILTER_OP_BIT_XOR: | |
730 | ret = bin_op_bitwise_check(stack, opcode, "^"); | |
731 | if (ret < 0) | |
732 | goto end; | |
733 | break; | |
734 | ||
07dfc1d0 MD |
735 | /* unary */ |
736 | case FILTER_OP_UNARY_PLUS: | |
737 | case FILTER_OP_UNARY_MINUS: | |
738 | case FILTER_OP_UNARY_NOT: | |
739 | { | |
740 | if (!vstack_ax(stack)) { | |
741 | printk(KERN_WARNING "Empty stack\n"); | |
742 | ret = -EINVAL; | |
743 | goto end; | |
744 | } | |
745 | switch (vstack_ax(stack)->type) { | |
746 | default: | |
747 | case REG_DOUBLE: | |
748 | printk(KERN_WARNING "unknown register type\n"); | |
749 | ret = -EINVAL; | |
750 | goto end; | |
751 | ||
752 | case REG_STRING: | |
02aca193 | 753 | case REG_STAR_GLOB_STRING: |
07dfc1d0 MD |
754 | printk(KERN_WARNING "Unary op can only be applied to numeric or floating point registers\n"); |
755 | ret = -EINVAL; | |
756 | goto end; | |
757 | case REG_S64: | |
3834b99f | 758 | case REG_TYPE_UNKNOWN: |
07dfc1d0 MD |
759 | break; |
760 | } | |
761 | break; | |
762 | } | |
e16c054b MD |
763 | case FILTER_OP_UNARY_BIT_NOT: |
764 | { | |
765 | if (!vstack_ax(stack)) { | |
766 | printk(KERN_WARNING "Empty stack\n"); | |
767 | ret = -EINVAL; | |
768 | goto end; | |
769 | } | |
770 | switch (vstack_ax(stack)->type) { | |
771 | default: | |
772 | printk(KERN_WARNING "unknown register type\n"); | |
773 | ret = -EINVAL; | |
774 | goto end; | |
775 | ||
776 | case REG_STRING: | |
777 | case REG_STAR_GLOB_STRING: | |
778 | case REG_DOUBLE: | |
779 | printk(KERN_WARNING "Unary bitwise op can only be applied to numeric registers\n"); | |
780 | ret = -EINVAL; | |
781 | goto end; | |
782 | case REG_S64: | |
783 | break; | |
784 | case REG_TYPE_UNKNOWN: | |
785 | break; | |
786 | } | |
787 | break; | |
788 | } | |
07dfc1d0 MD |
789 | |
790 | case FILTER_OP_UNARY_PLUS_S64: | |
791 | case FILTER_OP_UNARY_MINUS_S64: | |
792 | case FILTER_OP_UNARY_NOT_S64: | |
793 | { | |
794 | if (!vstack_ax(stack)) { | |
795 | printk(KERN_WARNING "Empty stack\n"); | |
796 | ret = -EINVAL; | |
797 | goto end; | |
798 | } | |
799 | if (vstack_ax(stack)->type != REG_S64) { | |
800 | printk(KERN_WARNING "Invalid register type\n"); | |
801 | ret = -EINVAL; | |
802 | goto end; | |
803 | } | |
804 | break; | |
805 | } | |
806 | ||
807 | /* logical */ | |
808 | case FILTER_OP_AND: | |
809 | case FILTER_OP_OR: | |
810 | { | |
811 | struct logical_op *insn = (struct logical_op *) pc; | |
812 | ||
813 | if (!vstack_ax(stack)) { | |
814 | printk(KERN_WARNING "Empty stack\n"); | |
815 | ret = -EINVAL; | |
816 | goto end; | |
817 | } | |
818 | if (vstack_ax(stack)->type != REG_S64) { | |
819 | printk(KERN_WARNING "Logical comparator expects S64 register\n"); | |
820 | ret = -EINVAL; | |
821 | goto end; | |
822 | } | |
823 | ||
824 | dbg_printk("Validate jumping to bytecode offset %u\n", | |
825 | (unsigned int) insn->skip_offset); | |
826 | if (unlikely(start_pc + insn->skip_offset <= pc)) { | |
827 | printk(KERN_WARNING "Loops are not allowed in bytecode\n"); | |
828 | ret = -EINVAL; | |
829 | goto end; | |
830 | } | |
831 | break; | |
832 | } | |
833 | ||
834 | /* load field ref */ | |
835 | case FILTER_OP_LOAD_FIELD_REF: | |
836 | { | |
837 | printk(KERN_WARNING "Unknown field ref type\n"); | |
838 | ret = -EINVAL; | |
839 | goto end; | |
840 | } | |
841 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
842 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
f127e61e MD |
843 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
844 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
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 string\n", | |
850 | ref->offset); | |
851 | break; | |
852 | } | |
853 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
854 | { | |
855 | struct load_op *insn = (struct load_op *) pc; | |
856 | struct field_ref *ref = (struct field_ref *) insn->data; | |
857 | ||
858 | dbg_printk("Validate load field ref offset %u type s64\n", | |
859 | ref->offset); | |
860 | break; | |
861 | } | |
862 | ||
863 | /* load from immediate operand */ | |
864 | case FILTER_OP_LOAD_STRING: | |
02aca193 | 865 | case FILTER_OP_LOAD_STAR_GLOB_STRING: |
07dfc1d0 MD |
866 | { |
867 | break; | |
868 | } | |
869 | ||
870 | case FILTER_OP_LOAD_S64: | |
871 | { | |
872 | break; | |
873 | } | |
874 | ||
875 | case FILTER_OP_CAST_TO_S64: | |
876 | { | |
877 | struct cast_op *insn = (struct cast_op *) pc; | |
878 | ||
879 | if (!vstack_ax(stack)) { | |
880 | printk(KERN_WARNING "Empty stack\n"); | |
881 | ret = -EINVAL; | |
882 | goto end; | |
883 | } | |
884 | switch (vstack_ax(stack)->type) { | |
885 | default: | |
886 | case REG_DOUBLE: | |
887 | printk(KERN_WARNING "unknown register type\n"); | |
888 | ret = -EINVAL; | |
889 | goto end; | |
890 | ||
891 | case REG_STRING: | |
02aca193 | 892 | case REG_STAR_GLOB_STRING: |
07dfc1d0 MD |
893 | printk(KERN_WARNING "Cast op can only be applied to numeric or floating point registers\n"); |
894 | ret = -EINVAL; | |
895 | goto end; | |
896 | case REG_S64: | |
897 | break; | |
898 | } | |
899 | if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) { | |
900 | if (vstack_ax(stack)->type != REG_DOUBLE) { | |
901 | printk(KERN_WARNING "Cast expects double\n"); | |
902 | ret = -EINVAL; | |
903 | goto end; | |
904 | } | |
905 | } | |
906 | break; | |
907 | } | |
908 | case FILTER_OP_CAST_NOP: | |
909 | { | |
910 | break; | |
911 | } | |
912 | ||
913 | /* get context ref */ | |
914 | case FILTER_OP_GET_CONTEXT_REF: | |
915 | { | |
916 | printk(KERN_WARNING "Unknown get context ref type\n"); | |
917 | ret = -EINVAL; | |
918 | goto end; | |
919 | } | |
920 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
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 string\n", | |
926 | ref->offset); | |
927 | break; | |
928 | } | |
929 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
930 | { | |
931 | struct load_op *insn = (struct load_op *) pc; | |
932 | struct field_ref *ref = (struct field_ref *) insn->data; | |
933 | ||
934 | dbg_printk("Validate get context ref offset %u type s64\n", | |
935 | ref->offset); | |
936 | break; | |
937 | } | |
938 | ||
3834b99f MD |
939 | /* |
940 | * Instructions for recursive traversal through composed types. | |
941 | */ | |
942 | case FILTER_OP_GET_CONTEXT_ROOT: | |
943 | { | |
944 | dbg_printk("Validate get context root\n"); | |
945 | break; | |
946 | } | |
947 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
948 | { | |
949 | dbg_printk("Validate get app context root\n"); | |
950 | break; | |
951 | } | |
952 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
953 | { | |
954 | dbg_printk("Validate get payload root\n"); | |
955 | break; | |
956 | } | |
957 | case FILTER_OP_LOAD_FIELD: | |
958 | { | |
959 | /* | |
960 | * We tolerate that field type is unknown at validation, | |
961 | * because we are performing the load specialization in | |
962 | * a phase after validation. | |
963 | */ | |
964 | dbg_printk("Validate load field\n"); | |
965 | break; | |
966 | } | |
499ac8be MD |
967 | |
968 | /* | |
969 | * Disallow already specialized bytecode op load field instructions to | |
970 | * ensure that the received bytecode does not: | |
971 | * | |
972 | * - Read user-space memory without proper get_user accessors, | |
973 | * - Read a memory area larger than the memory targeted by the instrumentation. | |
974 | */ | |
3834b99f | 975 | case FILTER_OP_LOAD_FIELD_S8: |
3834b99f | 976 | case FILTER_OP_LOAD_FIELD_S16: |
3834b99f | 977 | case FILTER_OP_LOAD_FIELD_S32: |
3834b99f | 978 | case FILTER_OP_LOAD_FIELD_S64: |
3834b99f | 979 | case FILTER_OP_LOAD_FIELD_U8: |
3834b99f | 980 | case FILTER_OP_LOAD_FIELD_U16: |
3834b99f | 981 | case FILTER_OP_LOAD_FIELD_U32: |
3834b99f | 982 | case FILTER_OP_LOAD_FIELD_U64: |
3834b99f | 983 | case FILTER_OP_LOAD_FIELD_STRING: |
3834b99f | 984 | case FILTER_OP_LOAD_FIELD_SEQUENCE: |
3834b99f MD |
985 | case FILTER_OP_LOAD_FIELD_DOUBLE: |
986 | { | |
499ac8be MD |
987 | dbg_printk("Validate load field, reject specialized load instruction (%d)\n", |
988 | (int) opcode); | |
989 | ret = -EINVAL; | |
990 | goto end; | |
3834b99f MD |
991 | } |
992 | ||
993 | case FILTER_OP_GET_SYMBOL: | |
994 | { | |
995 | struct load_op *insn = (struct load_op *) pc; | |
996 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
997 | ||
998 | dbg_printk("Validate get symbol offset %u\n", sym->offset); | |
999 | break; | |
1000 | } | |
1001 | ||
1002 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1003 | { | |
1004 | struct load_op *insn = (struct load_op *) pc; | |
1005 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1006 | ||
1007 | dbg_printk("Validate get symbol field offset %u\n", sym->offset); | |
1008 | break; | |
1009 | } | |
1010 | ||
1011 | case FILTER_OP_GET_INDEX_U16: | |
1012 | { | |
1013 | struct load_op *insn = (struct load_op *) pc; | |
1014 | struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data; | |
1015 | ||
1016 | dbg_printk("Validate get index u16 index %u\n", get_index->index); | |
1017 | break; | |
1018 | } | |
1019 | ||
1020 | case FILTER_OP_GET_INDEX_U64: | |
1021 | { | |
1022 | struct load_op *insn = (struct load_op *) pc; | |
1023 | struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data; | |
1024 | ||
1025 | dbg_printk("Validate get index u64 index %llu\n", | |
1026 | (unsigned long long) get_index->index); | |
1027 | break; | |
1028 | } | |
07dfc1d0 MD |
1029 | } |
1030 | end: | |
1031 | return ret; | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Return value: | |
1036 | * 0: success | |
1037 | * <0: error | |
1038 | */ | |
1039 | static | |
1040 | int validate_instruction_all_contexts(struct bytecode_runtime *bytecode, | |
1041 | struct mp_table *mp_table, | |
1042 | struct vstack *stack, | |
7962cb86 MD |
1043 | char *start_pc, |
1044 | char *pc) | |
07dfc1d0 MD |
1045 | { |
1046 | int ret, found = 0; | |
1047 | unsigned long target_pc = pc - start_pc; | |
1048 | unsigned long hash; | |
1049 | struct hlist_head *head; | |
1050 | struct mp_node *mp_node; | |
1051 | ||
1052 | /* Validate the context resulting from the previous instruction */ | |
1053 | ret = validate_instruction_context(bytecode, stack, start_pc, pc); | |
3834b99f | 1054 | if (ret < 0) |
07dfc1d0 MD |
1055 | return ret; |
1056 | ||
1057 | /* Validate merge points */ | |
1058 | hash = jhash_1word(target_pc, 0); | |
1059 | head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)]; | |
d216ecae | 1060 | lttng_hlist_for_each_entry(mp_node, head, node) { |
07dfc1d0 MD |
1061 | if (lttng_hash_match(mp_node, target_pc)) { |
1062 | found = 1; | |
1063 | break; | |
1064 | } | |
1065 | } | |
1066 | if (found) { | |
1067 | dbg_printk("Filter: validate merge point at offset %lu\n", | |
1068 | target_pc); | |
1069 | if (merge_points_compare(stack, &mp_node->stack)) { | |
1070 | printk(KERN_WARNING "Merge points differ for offset %lu\n", | |
1071 | target_pc); | |
1072 | return -EINVAL; | |
1073 | } | |
1074 | /* Once validated, we can remove the merge point */ | |
1075 | dbg_printk("Filter: remove merge point at offset %lu\n", | |
1076 | target_pc); | |
1077 | hlist_del(&mp_node->node); | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
ce5579a7 MD |
1082 | /* |
1083 | * Validate load instructions: specialized instructions not accepted as input. | |
1084 | * | |
1085 | * Return value: | |
1086 | * >0: going to next insn. | |
1087 | * 0: success, stop iteration. | |
1088 | * <0: error | |
1089 | */ | |
1090 | static | |
1091 | int validate_load(char **_next_pc, | |
1092 | char *pc) | |
1093 | { | |
1094 | int ret = 0; | |
1095 | char *next_pc = *_next_pc; | |
1096 | ||
1097 | switch (*(filter_opcode_t *) pc) { | |
1098 | case FILTER_OP_UNKNOWN: | |
1099 | default: | |
1100 | { | |
1101 | printk(KERN_WARNING "LTTng: bytecode: unknown bytecode op %u\n", | |
1102 | (unsigned int) *(filter_opcode_t *) pc); | |
1103 | ret = -EINVAL; | |
1104 | goto end; | |
1105 | } | |
1106 | ||
1107 | case FILTER_OP_RETURN: | |
1108 | { | |
1109 | next_pc += sizeof(struct return_op); | |
1110 | break; | |
1111 | } | |
1112 | ||
1113 | case FILTER_OP_RETURN_S64: | |
1114 | { | |
1115 | next_pc += sizeof(struct return_op); | |
1116 | break; | |
1117 | } | |
1118 | ||
1119 | /* binary */ | |
1120 | case FILTER_OP_MUL: | |
1121 | case FILTER_OP_DIV: | |
1122 | case FILTER_OP_MOD: | |
1123 | case FILTER_OP_PLUS: | |
1124 | case FILTER_OP_MINUS: | |
1125 | /* Floating point */ | |
1126 | case FILTER_OP_EQ_DOUBLE: | |
1127 | case FILTER_OP_NE_DOUBLE: | |
1128 | case FILTER_OP_GT_DOUBLE: | |
1129 | case FILTER_OP_LT_DOUBLE: | |
1130 | case FILTER_OP_GE_DOUBLE: | |
1131 | case FILTER_OP_LE_DOUBLE: | |
1132 | case FILTER_OP_EQ_DOUBLE_S64: | |
1133 | case FILTER_OP_NE_DOUBLE_S64: | |
1134 | case FILTER_OP_GT_DOUBLE_S64: | |
1135 | case FILTER_OP_LT_DOUBLE_S64: | |
1136 | case FILTER_OP_GE_DOUBLE_S64: | |
1137 | case FILTER_OP_LE_DOUBLE_S64: | |
1138 | case FILTER_OP_EQ_S64_DOUBLE: | |
1139 | case FILTER_OP_NE_S64_DOUBLE: | |
1140 | case FILTER_OP_GT_S64_DOUBLE: | |
1141 | case FILTER_OP_LT_S64_DOUBLE: | |
1142 | case FILTER_OP_GE_S64_DOUBLE: | |
1143 | case FILTER_OP_LE_S64_DOUBLE: | |
1144 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
1145 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
1146 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
1147 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
1148 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
1149 | case FILTER_OP_LOAD_DOUBLE: | |
1150 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
1151 | { | |
1152 | printk(KERN_WARNING "LTTng: bytecode: unsupported bytecode op %u\n", | |
1153 | (unsigned int) *(filter_opcode_t *) pc); | |
1154 | ret = -EINVAL; | |
1155 | goto end; | |
1156 | } | |
1157 | ||
1158 | case FILTER_OP_EQ: | |
1159 | case FILTER_OP_NE: | |
1160 | case FILTER_OP_GT: | |
1161 | case FILTER_OP_LT: | |
1162 | case FILTER_OP_GE: | |
1163 | case FILTER_OP_LE: | |
1164 | case FILTER_OP_EQ_STRING: | |
1165 | case FILTER_OP_NE_STRING: | |
1166 | case FILTER_OP_GT_STRING: | |
1167 | case FILTER_OP_LT_STRING: | |
1168 | case FILTER_OP_GE_STRING: | |
1169 | case FILTER_OP_LE_STRING: | |
1170 | case FILTER_OP_EQ_STAR_GLOB_STRING: | |
1171 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
1172 | case FILTER_OP_EQ_S64: | |
1173 | case FILTER_OP_NE_S64: | |
1174 | case FILTER_OP_GT_S64: | |
1175 | case FILTER_OP_LT_S64: | |
1176 | case FILTER_OP_GE_S64: | |
1177 | case FILTER_OP_LE_S64: | |
1178 | case FILTER_OP_BIT_RSHIFT: | |
1179 | case FILTER_OP_BIT_LSHIFT: | |
1180 | case FILTER_OP_BIT_AND: | |
1181 | case FILTER_OP_BIT_OR: | |
1182 | case FILTER_OP_BIT_XOR: | |
1183 | { | |
1184 | next_pc += sizeof(struct binary_op); | |
1185 | break; | |
1186 | } | |
1187 | ||
1188 | /* unary */ | |
1189 | case FILTER_OP_UNARY_PLUS: | |
1190 | case FILTER_OP_UNARY_MINUS: | |
1191 | case FILTER_OP_UNARY_PLUS_S64: | |
1192 | case FILTER_OP_UNARY_MINUS_S64: | |
1193 | case FILTER_OP_UNARY_NOT_S64: | |
1194 | case FILTER_OP_UNARY_NOT: | |
1195 | case FILTER_OP_UNARY_BIT_NOT: | |
1196 | { | |
1197 | next_pc += sizeof(struct unary_op); | |
1198 | break; | |
1199 | } | |
1200 | ||
1201 | /* logical */ | |
1202 | case FILTER_OP_AND: | |
1203 | case FILTER_OP_OR: | |
1204 | { | |
1205 | next_pc += sizeof(struct logical_op); | |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | /* load field ref */ | |
1210 | case FILTER_OP_LOAD_FIELD_REF: | |
1211 | /* get context ref */ | |
1212 | case FILTER_OP_GET_CONTEXT_REF: | |
1213 | { | |
1214 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1215 | break; | |
1216 | } | |
1217 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
1218 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
1219 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
1220 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: | |
1221 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
1222 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
1223 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
1224 | { | |
1225 | /* | |
1226 | * Reject specialized load field ref instructions. | |
1227 | */ | |
1228 | ret = -EINVAL; | |
1229 | goto end; | |
1230 | } | |
1231 | ||
1232 | /* load from immediate operand */ | |
1233 | case FILTER_OP_LOAD_STRING: | |
1234 | case FILTER_OP_LOAD_STAR_GLOB_STRING: | |
1235 | { | |
1236 | struct load_op *insn = (struct load_op *) pc; | |
1237 | ||
1238 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
1239 | break; | |
1240 | } | |
1241 | ||
1242 | case FILTER_OP_LOAD_S64: | |
1243 | { | |
1244 | next_pc += sizeof(struct load_op) + sizeof(struct literal_numeric); | |
1245 | break; | |
1246 | } | |
1247 | ||
1248 | case FILTER_OP_CAST_TO_S64: | |
1249 | case FILTER_OP_CAST_NOP: | |
1250 | { | |
1251 | next_pc += sizeof(struct cast_op); | |
1252 | break; | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Instructions for recursive traversal through composed types. | |
1257 | */ | |
1258 | case FILTER_OP_GET_CONTEXT_ROOT: | |
1259 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
1260 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
1261 | case FILTER_OP_LOAD_FIELD: | |
1262 | { | |
1263 | next_pc += sizeof(struct load_op); | |
1264 | break; | |
1265 | } | |
1266 | ||
1267 | case FILTER_OP_LOAD_FIELD_S8: | |
1268 | case FILTER_OP_LOAD_FIELD_S16: | |
1269 | case FILTER_OP_LOAD_FIELD_S32: | |
1270 | case FILTER_OP_LOAD_FIELD_S64: | |
1271 | case FILTER_OP_LOAD_FIELD_U8: | |
1272 | case FILTER_OP_LOAD_FIELD_U16: | |
1273 | case FILTER_OP_LOAD_FIELD_U32: | |
1274 | case FILTER_OP_LOAD_FIELD_U64: | |
1275 | case FILTER_OP_LOAD_FIELD_STRING: | |
1276 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
1277 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
1278 | { | |
1279 | /* | |
1280 | * Reject specialized load field instructions. | |
1281 | */ | |
1282 | ret = -EINVAL; | |
1283 | goto end; | |
1284 | } | |
1285 | ||
1286 | case FILTER_OP_GET_SYMBOL: | |
1287 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1288 | { | |
1289 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); | |
1290 | break; | |
1291 | } | |
1292 | ||
1293 | case FILTER_OP_GET_INDEX_U16: | |
1294 | { | |
1295 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); | |
1296 | break; | |
1297 | } | |
1298 | ||
1299 | case FILTER_OP_GET_INDEX_U64: | |
1300 | { | |
1301 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); | |
1302 | break; | |
1303 | } | |
1304 | ||
1305 | } | |
1306 | end: | |
1307 | *_next_pc = next_pc; | |
1308 | return ret; | |
1309 | } | |
1310 | ||
07dfc1d0 MD |
1311 | /* |
1312 | * Return value: | |
1313 | * >0: going to next insn. | |
1314 | * 0: success, stop iteration. | |
1315 | * <0: error | |
1316 | */ | |
1317 | static | |
1318 | int exec_insn(struct bytecode_runtime *bytecode, | |
1319 | struct mp_table *mp_table, | |
1320 | struct vstack *stack, | |
7962cb86 MD |
1321 | char **_next_pc, |
1322 | char *pc) | |
07dfc1d0 MD |
1323 | { |
1324 | int ret = 1; | |
7962cb86 | 1325 | char *next_pc = *_next_pc; |
07dfc1d0 MD |
1326 | |
1327 | switch (*(filter_opcode_t *) pc) { | |
1328 | case FILTER_OP_UNKNOWN: | |
1329 | default: | |
1330 | { | |
1331 | printk(KERN_WARNING "unknown bytecode op %u\n", | |
1332 | (unsigned int) *(filter_opcode_t *) pc); | |
1333 | ret = -EINVAL; | |
1334 | goto end; | |
1335 | } | |
1336 | ||
1337 | case FILTER_OP_RETURN: | |
1338 | { | |
1339 | if (!vstack_ax(stack)) { | |
1340 | printk(KERN_WARNING "Empty stack\n"); | |
1341 | ret = -EINVAL; | |
1342 | goto end; | |
1343 | } | |
3834b99f MD |
1344 | switch (vstack_ax(stack)->type) { |
1345 | case REG_S64: | |
1346 | case REG_TYPE_UNKNOWN: | |
1347 | break; | |
1348 | default: | |
1349 | printk(KERN_WARNING "Unexpected register type %d at end of bytecode\n", | |
1350 | (int) vstack_ax(stack)->type); | |
1351 | ret = -EINVAL; | |
1352 | goto end; | |
1353 | } | |
1354 | ||
07dfc1d0 MD |
1355 | ret = 0; |
1356 | goto end; | |
1357 | } | |
1358 | ||
57ba4b41 MD |
1359 | case FILTER_OP_RETURN_S64: |
1360 | { | |
1361 | if (!vstack_ax(stack)) { | |
1362 | printk(KERN_WARNING "Empty stack\n"); | |
1363 | ret = -EINVAL; | |
1364 | goto end; | |
1365 | } | |
1366 | switch (vstack_ax(stack)->type) { | |
1367 | case REG_S64: | |
1368 | break; | |
1369 | default: | |
1370 | case REG_TYPE_UNKNOWN: | |
1371 | printk(KERN_WARNING "Unexpected register type %d at end of bytecode\n", | |
1372 | (int) vstack_ax(stack)->type); | |
1373 | ret = -EINVAL; | |
1374 | goto end; | |
1375 | } | |
1376 | ||
1377 | ret = 0; | |
1378 | goto end; | |
1379 | } | |
1380 | ||
07dfc1d0 MD |
1381 | /* binary */ |
1382 | case FILTER_OP_MUL: | |
1383 | case FILTER_OP_DIV: | |
1384 | case FILTER_OP_MOD: | |
1385 | case FILTER_OP_PLUS: | |
1386 | case FILTER_OP_MINUS: | |
07dfc1d0 MD |
1387 | /* Floating point */ |
1388 | case FILTER_OP_EQ_DOUBLE: | |
1389 | case FILTER_OP_NE_DOUBLE: | |
1390 | case FILTER_OP_GT_DOUBLE: | |
1391 | case FILTER_OP_LT_DOUBLE: | |
1392 | case FILTER_OP_GE_DOUBLE: | |
1393 | case FILTER_OP_LE_DOUBLE: | |
1394 | case FILTER_OP_EQ_DOUBLE_S64: | |
1395 | case FILTER_OP_NE_DOUBLE_S64: | |
1396 | case FILTER_OP_GT_DOUBLE_S64: | |
1397 | case FILTER_OP_LT_DOUBLE_S64: | |
1398 | case FILTER_OP_GE_DOUBLE_S64: | |
1399 | case FILTER_OP_LE_DOUBLE_S64: | |
1400 | case FILTER_OP_EQ_S64_DOUBLE: | |
1401 | case FILTER_OP_NE_S64_DOUBLE: | |
1402 | case FILTER_OP_GT_S64_DOUBLE: | |
1403 | case FILTER_OP_LT_S64_DOUBLE: | |
1404 | case FILTER_OP_GE_S64_DOUBLE: | |
1405 | case FILTER_OP_LE_S64_DOUBLE: | |
1406 | case FILTER_OP_UNARY_PLUS_DOUBLE: | |
1407 | case FILTER_OP_UNARY_MINUS_DOUBLE: | |
1408 | case FILTER_OP_UNARY_NOT_DOUBLE: | |
1409 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
1410 | case FILTER_OP_GET_CONTEXT_REF_DOUBLE: | |
1411 | case FILTER_OP_LOAD_DOUBLE: | |
1412 | case FILTER_OP_CAST_DOUBLE_TO_S64: | |
1413 | { | |
1414 | printk(KERN_WARNING "unsupported bytecode op %u\n", | |
1415 | (unsigned int) *(filter_opcode_t *) pc); | |
1416 | ret = -EINVAL; | |
1417 | goto end; | |
1418 | } | |
1419 | ||
1420 | case FILTER_OP_EQ: | |
1421 | case FILTER_OP_NE: | |
1422 | case FILTER_OP_GT: | |
1423 | case FILTER_OP_LT: | |
1424 | case FILTER_OP_GE: | |
1425 | case FILTER_OP_LE: | |
1426 | case FILTER_OP_EQ_STRING: | |
1427 | case FILTER_OP_NE_STRING: | |
1428 | case FILTER_OP_GT_STRING: | |
1429 | case FILTER_OP_LT_STRING: | |
1430 | case FILTER_OP_GE_STRING: | |
1431 | case FILTER_OP_LE_STRING: | |
02aca193 PP |
1432 | case FILTER_OP_EQ_STAR_GLOB_STRING: |
1433 | case FILTER_OP_NE_STAR_GLOB_STRING: | |
07dfc1d0 MD |
1434 | case FILTER_OP_EQ_S64: |
1435 | case FILTER_OP_NE_S64: | |
1436 | case FILTER_OP_GT_S64: | |
1437 | case FILTER_OP_LT_S64: | |
1438 | case FILTER_OP_GE_S64: | |
1439 | case FILTER_OP_LE_S64: | |
e16c054b MD |
1440 | case FILTER_OP_BIT_RSHIFT: |
1441 | case FILTER_OP_BIT_LSHIFT: | |
3834b99f MD |
1442 | case FILTER_OP_BIT_AND: |
1443 | case FILTER_OP_BIT_OR: | |
1444 | case FILTER_OP_BIT_XOR: | |
07dfc1d0 MD |
1445 | { |
1446 | /* Pop 2, push 1 */ | |
1447 | if (vstack_pop(stack)) { | |
1448 | ret = -EINVAL; | |
1449 | goto end; | |
1450 | } | |
1451 | if (!vstack_ax(stack)) { | |
1452 | printk(KERN_WARNING "Empty stack\n"); | |
1453 | ret = -EINVAL; | |
1454 | goto end; | |
1455 | } | |
3834b99f MD |
1456 | switch (vstack_ax(stack)->type) { |
1457 | case REG_S64: | |
1458 | case REG_DOUBLE: | |
1459 | case REG_STRING: | |
1460 | case REG_STAR_GLOB_STRING: | |
1461 | case REG_TYPE_UNKNOWN: | |
1462 | break; | |
1463 | default: | |
1464 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
1465 | (int) vstack_ax(stack)->type); | |
1466 | ret = -EINVAL; | |
1467 | goto end; | |
1468 | } | |
1469 | ||
07dfc1d0 MD |
1470 | vstack_ax(stack)->type = REG_S64; |
1471 | next_pc += sizeof(struct binary_op); | |
1472 | break; | |
1473 | } | |
1474 | ||
1475 | /* unary */ | |
1476 | case FILTER_OP_UNARY_PLUS: | |
1477 | case FILTER_OP_UNARY_MINUS: | |
3834b99f MD |
1478 | { |
1479 | /* Pop 1, push 1 */ | |
1480 | if (!vstack_ax(stack)) { | |
1481 | printk(KERN_WARNING "Empty stack\n\n"); | |
1482 | ret = -EINVAL; | |
1483 | goto end; | |
1484 | } | |
1485 | switch (vstack_ax(stack)->type) { | |
1486 | case REG_S64: | |
1487 | case REG_TYPE_UNKNOWN: | |
1488 | break; | |
1489 | default: | |
1490 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
1491 | (int) vstack_ax(stack)->type); | |
1492 | ret = -EINVAL; | |
1493 | goto end; | |
1494 | } | |
1495 | ||
1496 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; | |
1497 | next_pc += sizeof(struct unary_op); | |
1498 | break; | |
1499 | } | |
1500 | ||
07dfc1d0 MD |
1501 | case FILTER_OP_UNARY_PLUS_S64: |
1502 | case FILTER_OP_UNARY_MINUS_S64: | |
1503 | case FILTER_OP_UNARY_NOT_S64: | |
1504 | { | |
1505 | /* Pop 1, push 1 */ | |
1506 | if (!vstack_ax(stack)) { | |
3834b99f MD |
1507 | printk(KERN_WARNING "Empty stack\n\n"); |
1508 | ret = -EINVAL; | |
1509 | goto end; | |
1510 | } | |
1511 | switch (vstack_ax(stack)->type) { | |
1512 | case REG_S64: | |
1513 | break; | |
1514 | default: | |
1515 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
1516 | (int) vstack_ax(stack)->type); | |
1517 | ret = -EINVAL; | |
1518 | goto end; | |
1519 | } | |
1520 | ||
1521 | vstack_ax(stack)->type = REG_S64; | |
1522 | next_pc += sizeof(struct unary_op); | |
1523 | break; | |
1524 | } | |
1525 | ||
1526 | case FILTER_OP_UNARY_NOT: | |
1527 | { | |
1528 | /* Pop 1, push 1 */ | |
1529 | if (!vstack_ax(stack)) { | |
1530 | printk(KERN_WARNING "Empty stack\n\n"); | |
1531 | ret = -EINVAL; | |
1532 | goto end; | |
1533 | } | |
1534 | switch (vstack_ax(stack)->type) { | |
1535 | case REG_S64: | |
1536 | case REG_TYPE_UNKNOWN: | |
1537 | break; | |
1538 | default: | |
1539 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
e16c054b MD |
1540 | (int) vstack_ax(stack)->type); |
1541 | ret = -EINVAL; | |
1542 | goto end; | |
1543 | } | |
1544 | ||
1545 | vstack_ax(stack)->type = REG_S64; | |
1546 | next_pc += sizeof(struct unary_op); | |
1547 | break; | |
1548 | } | |
1549 | ||
1550 | case FILTER_OP_UNARY_BIT_NOT: | |
1551 | { | |
1552 | /* Pop 1, push 1 */ | |
1553 | if (!vstack_ax(stack)) { | |
1554 | printk(KERN_WARNING "Empty stack\n"); | |
1555 | ret = -EINVAL; | |
1556 | goto end; | |
1557 | } | |
1558 | switch (vstack_ax(stack)->type) { | |
1559 | case REG_S64: | |
1560 | case REG_TYPE_UNKNOWN: | |
1561 | break; | |
1562 | case REG_DOUBLE: | |
1563 | default: | |
1564 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
3834b99f | 1565 | (int) vstack_ax(stack)->type); |
07dfc1d0 MD |
1566 | ret = -EINVAL; |
1567 | goto end; | |
1568 | } | |
3834b99f | 1569 | |
07dfc1d0 MD |
1570 | vstack_ax(stack)->type = REG_S64; |
1571 | next_pc += sizeof(struct unary_op); | |
1572 | break; | |
1573 | } | |
1574 | ||
1575 | /* logical */ | |
1576 | case FILTER_OP_AND: | |
1577 | case FILTER_OP_OR: | |
1578 | { | |
1579 | struct logical_op *insn = (struct logical_op *) pc; | |
1580 | int merge_ret; | |
1581 | ||
1582 | /* Add merge point to table */ | |
1583 | merge_ret = merge_point_add_check(mp_table, | |
1584 | insn->skip_offset, stack); | |
1585 | if (merge_ret) { | |
1586 | ret = merge_ret; | |
1587 | goto end; | |
1588 | } | |
3834b99f MD |
1589 | |
1590 | if (!vstack_ax(stack)) { | |
1591 | printk(KERN_WARNING "Empty stack\n\n"); | |
1592 | ret = -EINVAL; | |
1593 | goto end; | |
1594 | } | |
1595 | /* There is always a cast-to-s64 operation before a or/and op. */ | |
1596 | switch (vstack_ax(stack)->type) { | |
1597 | case REG_S64: | |
1598 | break; | |
1599 | default: | |
1600 | printk(KERN_WARNING "Incorrect register type %d for operation\n", | |
1601 | (int) vstack_ax(stack)->type); | |
1602 | ret = -EINVAL; | |
1603 | goto end; | |
1604 | } | |
1605 | ||
07dfc1d0 MD |
1606 | /* Continue to next instruction */ |
1607 | /* Pop 1 when jump not taken */ | |
1608 | if (vstack_pop(stack)) { | |
1609 | ret = -EINVAL; | |
1610 | goto end; | |
1611 | } | |
1612 | next_pc += sizeof(struct logical_op); | |
1613 | break; | |
1614 | } | |
1615 | ||
1616 | /* load field ref */ | |
1617 | case FILTER_OP_LOAD_FIELD_REF: | |
1618 | { | |
1619 | printk(KERN_WARNING "Unknown field ref type\n"); | |
1620 | ret = -EINVAL; | |
1621 | goto end; | |
1622 | } | |
1623 | /* get context ref */ | |
1624 | case FILTER_OP_GET_CONTEXT_REF: | |
1625 | { | |
1626 | printk(KERN_WARNING "Unknown get context ref type\n"); | |
1627 | ret = -EINVAL; | |
1628 | goto end; | |
1629 | } | |
1630 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
1631 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
1632 | case FILTER_OP_GET_CONTEXT_REF_STRING: | |
f127e61e MD |
1633 | case FILTER_OP_LOAD_FIELD_REF_USER_STRING: |
1634 | case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
1635 | { |
1636 | if (vstack_push(stack)) { | |
1637 | ret = -EINVAL; | |
1638 | goto end; | |
1639 | } | |
1640 | vstack_ax(stack)->type = REG_STRING; | |
1641 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1642 | break; | |
1643 | } | |
1644 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
1645 | case FILTER_OP_GET_CONTEXT_REF_S64: | |
1646 | { | |
1647 | if (vstack_push(stack)) { | |
1648 | ret = -EINVAL; | |
1649 | goto end; | |
1650 | } | |
1651 | vstack_ax(stack)->type = REG_S64; | |
1652 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1653 | break; | |
1654 | } | |
1655 | ||
1656 | /* load from immediate operand */ | |
1657 | case FILTER_OP_LOAD_STRING: | |
1658 | { | |
1659 | struct load_op *insn = (struct load_op *) pc; | |
1660 | ||
1661 | if (vstack_push(stack)) { | |
1662 | ret = -EINVAL; | |
1663 | goto end; | |
1664 | } | |
1665 | vstack_ax(stack)->type = REG_STRING; | |
1666 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
02aca193 PP |
1667 | break; |
1668 | } | |
1669 | ||
1670 | case FILTER_OP_LOAD_STAR_GLOB_STRING: | |
1671 | { | |
1672 | struct load_op *insn = (struct load_op *) pc; | |
1673 | ||
1674 | if (vstack_push(stack)) { | |
1675 | ret = -EINVAL; | |
1676 | goto end; | |
1677 | } | |
1678 | vstack_ax(stack)->type = REG_STAR_GLOB_STRING; | |
1679 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
07dfc1d0 MD |
1680 | break; |
1681 | } | |
1682 | ||
1683 | case FILTER_OP_LOAD_S64: | |
1684 | { | |
1685 | if (vstack_push(stack)) { | |
1686 | ret = -EINVAL; | |
1687 | goto end; | |
1688 | } | |
1689 | vstack_ax(stack)->type = REG_S64; | |
1690 | next_pc += sizeof(struct load_op) | |
1691 | + sizeof(struct literal_numeric); | |
1692 | break; | |
1693 | } | |
1694 | ||
1695 | case FILTER_OP_CAST_TO_S64: | |
1696 | { | |
1697 | /* Pop 1, push 1 */ | |
1698 | if (!vstack_ax(stack)) { | |
1699 | printk(KERN_WARNING "Empty stack\n"); | |
1700 | ret = -EINVAL; | |
1701 | goto end; | |
1702 | } | |
3834b99f MD |
1703 | switch (vstack_ax(stack)->type) { |
1704 | case REG_S64: | |
1705 | case REG_DOUBLE: | |
1706 | case REG_TYPE_UNKNOWN: | |
1707 | break; | |
1708 | default: | |
1709 | printk(KERN_WARNING "Incorrect register type %d for cast\n", | |
1710 | (int) vstack_ax(stack)->type); | |
1711 | ret = -EINVAL; | |
1712 | goto end; | |
1713 | } | |
07dfc1d0 MD |
1714 | vstack_ax(stack)->type = REG_S64; |
1715 | next_pc += sizeof(struct cast_op); | |
1716 | break; | |
1717 | } | |
1718 | case FILTER_OP_CAST_NOP: | |
1719 | { | |
1720 | next_pc += sizeof(struct cast_op); | |
1721 | break; | |
1722 | } | |
1723 | ||
3834b99f MD |
1724 | /* |
1725 | * Instructions for recursive traversal through composed types. | |
1726 | */ | |
1727 | case FILTER_OP_GET_CONTEXT_ROOT: | |
1728 | case FILTER_OP_GET_APP_CONTEXT_ROOT: | |
1729 | case FILTER_OP_GET_PAYLOAD_ROOT: | |
1730 | { | |
1731 | if (vstack_push(stack)) { | |
1732 | ret = -EINVAL; | |
1733 | goto end; | |
1734 | } | |
1735 | vstack_ax(stack)->type = REG_PTR; | |
1736 | next_pc += sizeof(struct load_op); | |
1737 | break; | |
1738 | } | |
1739 | ||
1740 | case FILTER_OP_LOAD_FIELD: | |
1741 | { | |
1742 | /* Pop 1, push 1 */ | |
1743 | if (!vstack_ax(stack)) { | |
1744 | printk(KERN_WARNING "Empty stack\n\n"); | |
1745 | ret = -EINVAL; | |
1746 | goto end; | |
1747 | } | |
1748 | if (vstack_ax(stack)->type != REG_PTR) { | |
1749 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1750 | ret = -EINVAL; | |
1751 | goto end; | |
1752 | } | |
1753 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; | |
1754 | next_pc += sizeof(struct load_op); | |
1755 | break; | |
1756 | } | |
1757 | ||
1758 | case FILTER_OP_LOAD_FIELD_S8: | |
1759 | case FILTER_OP_LOAD_FIELD_S16: | |
1760 | case FILTER_OP_LOAD_FIELD_S32: | |
1761 | case FILTER_OP_LOAD_FIELD_S64: | |
1762 | case FILTER_OP_LOAD_FIELD_U8: | |
1763 | case FILTER_OP_LOAD_FIELD_U16: | |
1764 | case FILTER_OP_LOAD_FIELD_U32: | |
1765 | case FILTER_OP_LOAD_FIELD_U64: | |
1766 | { | |
1767 | /* Pop 1, push 1 */ | |
1768 | if (!vstack_ax(stack)) { | |
1769 | printk(KERN_WARNING "Empty stack\n\n"); | |
1770 | ret = -EINVAL; | |
1771 | goto end; | |
1772 | } | |
1773 | if (vstack_ax(stack)->type != REG_PTR) { | |
1774 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1775 | ret = -EINVAL; | |
1776 | goto end; | |
1777 | } | |
1778 | vstack_ax(stack)->type = REG_S64; | |
1779 | next_pc += sizeof(struct load_op); | |
1780 | break; | |
1781 | } | |
1782 | ||
1783 | case FILTER_OP_LOAD_FIELD_STRING: | |
1784 | case FILTER_OP_LOAD_FIELD_SEQUENCE: | |
1785 | { | |
1786 | /* Pop 1, push 1 */ | |
1787 | if (!vstack_ax(stack)) { | |
1788 | printk(KERN_WARNING "Empty stack\n\n"); | |
1789 | ret = -EINVAL; | |
1790 | goto end; | |
1791 | } | |
1792 | if (vstack_ax(stack)->type != REG_PTR) { | |
1793 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1794 | ret = -EINVAL; | |
1795 | goto end; | |
1796 | } | |
1797 | vstack_ax(stack)->type = REG_STRING; | |
1798 | next_pc += sizeof(struct load_op); | |
1799 | break; | |
1800 | } | |
1801 | ||
1802 | case FILTER_OP_LOAD_FIELD_DOUBLE: | |
1803 | { | |
1804 | /* Pop 1, push 1 */ | |
1805 | if (!vstack_ax(stack)) { | |
1806 | printk(KERN_WARNING "Empty stack\n\n"); | |
1807 | ret = -EINVAL; | |
1808 | goto end; | |
1809 | } | |
1810 | if (vstack_ax(stack)->type != REG_PTR) { | |
1811 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1812 | ret = -EINVAL; | |
1813 | goto end; | |
1814 | } | |
1815 | vstack_ax(stack)->type = REG_DOUBLE; | |
1816 | next_pc += sizeof(struct load_op); | |
1817 | break; | |
1818 | } | |
1819 | ||
1820 | case FILTER_OP_GET_SYMBOL: | |
1821 | case FILTER_OP_GET_SYMBOL_FIELD: | |
1822 | { | |
1823 | /* Pop 1, push 1 */ | |
1824 | if (!vstack_ax(stack)) { | |
1825 | printk(KERN_WARNING "Empty stack\n\n"); | |
1826 | ret = -EINVAL; | |
1827 | goto end; | |
1828 | } | |
1829 | if (vstack_ax(stack)->type != REG_PTR) { | |
1830 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1831 | ret = -EINVAL; | |
1832 | goto end; | |
1833 | } | |
1834 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); | |
1835 | break; | |
1836 | } | |
1837 | ||
1838 | case FILTER_OP_GET_INDEX_U16: | |
1839 | { | |
1840 | /* Pop 1, push 1 */ | |
1841 | if (!vstack_ax(stack)) { | |
1842 | printk(KERN_WARNING "Empty stack\n\n"); | |
1843 | ret = -EINVAL; | |
1844 | goto end; | |
1845 | } | |
1846 | if (vstack_ax(stack)->type != REG_PTR) { | |
1847 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1848 | ret = -EINVAL; | |
1849 | goto end; | |
1850 | } | |
1851 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); | |
1852 | break; | |
1853 | } | |
1854 | ||
1855 | case FILTER_OP_GET_INDEX_U64: | |
1856 | { | |
1857 | /* Pop 1, push 1 */ | |
1858 | if (!vstack_ax(stack)) { | |
1859 | printk(KERN_WARNING "Empty stack\n\n"); | |
1860 | ret = -EINVAL; | |
1861 | goto end; | |
1862 | } | |
1863 | if (vstack_ax(stack)->type != REG_PTR) { | |
1864 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1865 | ret = -EINVAL; | |
1866 | goto end; | |
1867 | } | |
1868 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); | |
1869 | break; | |
1870 | } | |
1871 | ||
07dfc1d0 MD |
1872 | } |
1873 | end: | |
1874 | *_next_pc = next_pc; | |
1875 | return ret; | |
1876 | } | |
1877 | ||
ce5579a7 MD |
1878 | int lttng_filter_validate_bytecode_load(struct bytecode_runtime *bytecode) |
1879 | { | |
1880 | char *pc, *next_pc, *start_pc; | |
1881 | int ret = -EINVAL; | |
1882 | ||
1883 | start_pc = &bytecode->code[0]; | |
1884 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; | |
1885 | pc = next_pc) { | |
1886 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); | |
1887 | if (ret != 0) { | |
1888 | if (ret == -ERANGE) | |
1889 | printk(KERN_WARNING "LTTng: bytecode: bytecode overflow\n"); | |
1890 | goto end; | |
1891 | } | |
1892 | dbg_printk("Validating loads: op %s (%u)\n", | |
1893 | lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), | |
1894 | (unsigned int) *(filter_opcode_t *) pc); | |
1895 | ||
1896 | ret = validate_load(&next_pc, pc); | |
1897 | if (ret) | |
1898 | goto end; | |
1899 | } | |
1900 | end: | |
1901 | return ret; | |
1902 | } | |
1903 | ||
07dfc1d0 MD |
1904 | /* |
1905 | * Never called concurrently (hash seed is shared). | |
1906 | */ | |
1907 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) | |
1908 | { | |
1909 | struct mp_table *mp_table; | |
7962cb86 | 1910 | char *pc, *next_pc, *start_pc; |
07dfc1d0 MD |
1911 | int ret = -EINVAL; |
1912 | struct vstack stack; | |
1913 | ||
1914 | vstack_init(&stack); | |
1915 | ||
1916 | mp_table = kzalloc(sizeof(*mp_table), GFP_KERNEL); | |
1917 | if (!mp_table) { | |
1918 | printk(KERN_WARNING "Error allocating hash table for bytecode validation\n"); | |
1919 | return -ENOMEM; | |
1920 | } | |
3834b99f | 1921 | start_pc = &bytecode->code[0]; |
07dfc1d0 MD |
1922 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
1923 | pc = next_pc) { | |
1924 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); | |
1925 | if (ret != 0) { | |
1926 | if (ret == -ERANGE) | |
1927 | printk(KERN_WARNING "filter bytecode overflow\n"); | |
1928 | goto end; | |
1929 | } | |
1930 | dbg_printk("Validating op %s (%u)\n", | |
1931 | lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), | |
1932 | (unsigned int) *(filter_opcode_t *) pc); | |
1933 | ||
1934 | /* | |
1935 | * For each instruction, validate the current context | |
1936 | * (traversal of entire execution flow), and validate | |
3834b99f | 1937 | * all merge points targeting this instruction. |
07dfc1d0 MD |
1938 | */ |
1939 | ret = validate_instruction_all_contexts(bytecode, mp_table, | |
1940 | &stack, start_pc, pc); | |
1941 | if (ret) | |
1942 | goto end; | |
1943 | ret = exec_insn(bytecode, mp_table, &stack, &next_pc, pc); | |
1944 | if (ret <= 0) | |
1945 | goto end; | |
1946 | } | |
1947 | end: | |
1948 | if (delete_all_nodes(mp_table)) { | |
1949 | if (!ret) { | |
1950 | printk(KERN_WARNING "Unexpected merge points\n"); | |
1951 | ret = -EINVAL; | |
1952 | } | |
1953 | } | |
1954 | kfree(mp_table); | |
1955 | return ret; | |
1956 | } |