Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: MIT |
2 | * | |
80c2a69a | 3 | * lttng-bytecode-validator.c |
07dfc1d0 | 4 | * |
80c2a69a | 5 | * LTTng modules bytecode bytecode validator. |
07dfc1d0 | 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> |
80c2a69a | 15 | #include <lttng/lttng-bytecode.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 | ||
80c2a69a | 69 | dbg_printk("Bytecode: adding merge point at offset %lu, hash %lu\n", |
07dfc1d0 MD |
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 */ | |
80c2a69a | 86 | dbg_printk("Bytecode: compare merge points for offset %lu, hash %lu\n", |
07dfc1d0 MD |
87 | target_pc, hash); |
88 | kfree(mp_node); | |
89 | if (merge_points_compare(stack, &lookup_node->stack)) { | |
80c2a69a | 90 | printk(KERN_WARNING "LTTng: bytecode: 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 | |
80c2a69a | 104 | int bin_op_compare_check(struct vstack *stack, const bytecode_opcode_t opcode, |
02aca193 | 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 | 124 | case REG_STAR_GLOB_STRING: |
80c2a69a | 125 | if (opcode != BYTECODE_OP_EQ && opcode != BYTECODE_OP_NE) { |
02aca193 PP |
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 | 141 | case REG_STRING: |
80c2a69a | 142 | if (opcode != BYTECODE_OP_EQ && opcode != BYTECODE_OP_NE) { |
02aca193 PP |
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: | |
80c2a69a | 188 | printk(KERN_WARNING "LTTng: bytecode: empty stack for '%s' binary operator\n", str); |
07dfc1d0 MD |
189 | return -EINVAL; |
190 | ||
191 | error_mismatch: | |
80c2a69a | 192 | printk(KERN_WARNING "LTTng: bytecode: type mismatch for '%s' binary operator\n", str); |
07dfc1d0 | 193 | return -EINVAL; |
3834b99f MD |
194 | |
195 | error_type: | |
80c2a69a | 196 | printk(KERN_WARNING "LTTng: bytecode: 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 | |
80c2a69a | 206 | int bin_op_bitwise_check(struct vstack *stack, bytecode_opcode_t opcode, |
3834b99f MD |
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: | |
80c2a69a | 248 | printk(KERN_WARNING "LTTng: bytecode: empty stack for '%s' binary operator\n", str); |
3834b99f MD |
249 | return -EINVAL; |
250 | ||
251 | error_type: | |
80c2a69a | 252 | printk(KERN_WARNING "LTTng: bytecode: 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 | ||
80c2a69a FD |
284 | switch (*(bytecode_opcode_t *) pc) { |
285 | case BYTECODE_OP_UNKNOWN: | |
07dfc1d0 MD |
286 | default: |
287 | { | |
80c2a69a FD |
288 | printk(KERN_WARNING "LTTng: bytecode: unknown bytecode op %u\n", |
289 | (unsigned int) *(bytecode_opcode_t *) pc); | |
07dfc1d0 MD |
290 | ret = -EINVAL; |
291 | break; | |
292 | } | |
293 | ||
80c2a69a FD |
294 | case BYTECODE_OP_RETURN: |
295 | case BYTECODE_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 */ | |
80c2a69a FD |
305 | case BYTECODE_OP_MUL: |
306 | case BYTECODE_OP_DIV: | |
307 | case BYTECODE_OP_MOD: | |
308 | case BYTECODE_OP_PLUS: | |
309 | case BYTECODE_OP_MINUS: | |
310 | case BYTECODE_OP_EQ_DOUBLE: | |
311 | case BYTECODE_OP_NE_DOUBLE: | |
312 | case BYTECODE_OP_GT_DOUBLE: | |
313 | case BYTECODE_OP_LT_DOUBLE: | |
314 | case BYTECODE_OP_GE_DOUBLE: | |
315 | case BYTECODE_OP_LE_DOUBLE: | |
07dfc1d0 | 316 | /* Floating point */ |
80c2a69a FD |
317 | case BYTECODE_OP_EQ_DOUBLE_S64: |
318 | case BYTECODE_OP_NE_DOUBLE_S64: | |
319 | case BYTECODE_OP_GT_DOUBLE_S64: | |
320 | case BYTECODE_OP_LT_DOUBLE_S64: | |
321 | case BYTECODE_OP_GE_DOUBLE_S64: | |
322 | case BYTECODE_OP_LE_DOUBLE_S64: | |
323 | case BYTECODE_OP_EQ_S64_DOUBLE: | |
324 | case BYTECODE_OP_NE_S64_DOUBLE: | |
325 | case BYTECODE_OP_GT_S64_DOUBLE: | |
326 | case BYTECODE_OP_LT_S64_DOUBLE: | |
327 | case BYTECODE_OP_GE_S64_DOUBLE: | |
328 | case BYTECODE_OP_LE_S64_DOUBLE: | |
329 | case BYTECODE_OP_LOAD_FIELD_REF_DOUBLE: | |
330 | case BYTECODE_OP_GET_CONTEXT_REF_DOUBLE: | |
331 | case BYTECODE_OP_LOAD_DOUBLE: | |
332 | case BYTECODE_OP_CAST_DOUBLE_TO_S64: | |
333 | case BYTECODE_OP_UNARY_PLUS_DOUBLE: | |
334 | case BYTECODE_OP_UNARY_MINUS_DOUBLE: | |
335 | case BYTECODE_OP_UNARY_NOT_DOUBLE: | |
336 | { | |
337 | printk(KERN_WARNING "LTTng: bytecode: unsupported bytecode op %u\n", | |
338 | (unsigned int) *(bytecode_opcode_t *) pc); | |
07dfc1d0 MD |
339 | ret = -EINVAL; |
340 | break; | |
341 | } | |
342 | ||
80c2a69a FD |
343 | case BYTECODE_OP_EQ: |
344 | case BYTECODE_OP_NE: | |
345 | case BYTECODE_OP_GT: | |
346 | case BYTECODE_OP_LT: | |
347 | case BYTECODE_OP_GE: | |
348 | case BYTECODE_OP_LE: | |
349 | case BYTECODE_OP_EQ_STRING: | |
350 | case BYTECODE_OP_NE_STRING: | |
351 | case BYTECODE_OP_GT_STRING: | |
352 | case BYTECODE_OP_LT_STRING: | |
353 | case BYTECODE_OP_GE_STRING: | |
354 | case BYTECODE_OP_LE_STRING: | |
355 | case BYTECODE_OP_EQ_STAR_GLOB_STRING: | |
356 | case BYTECODE_OP_NE_STAR_GLOB_STRING: | |
357 | case BYTECODE_OP_EQ_S64: | |
358 | case BYTECODE_OP_NE_S64: | |
359 | case BYTECODE_OP_GT_S64: | |
360 | case BYTECODE_OP_LT_S64: | |
361 | case BYTECODE_OP_GE_S64: | |
362 | case BYTECODE_OP_LE_S64: | |
363 | case BYTECODE_OP_BIT_RSHIFT: | |
364 | case BYTECODE_OP_BIT_LSHIFT: | |
365 | case BYTECODE_OP_BIT_AND: | |
366 | case BYTECODE_OP_BIT_OR: | |
367 | case BYTECODE_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 */ | |
80c2a69a FD |
377 | case BYTECODE_OP_UNARY_PLUS: |
378 | case BYTECODE_OP_UNARY_MINUS: | |
379 | case BYTECODE_OP_UNARY_NOT: | |
380 | case BYTECODE_OP_UNARY_PLUS_S64: | |
381 | case BYTECODE_OP_UNARY_MINUS_S64: | |
382 | case BYTECODE_OP_UNARY_NOT_S64: | |
383 | case BYTECODE_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 */ | |
80c2a69a FD |
393 | case BYTECODE_OP_AND: |
394 | case BYTECODE_OP_OR: | |
07dfc1d0 MD |
395 | { |
396 | if (unlikely(pc + sizeof(struct logical_op) | |
397 | > start_pc + bytecode->len)) { | |
398 | ret = -ERANGE; | |
399 | } | |
400 | break; | |
401 | } | |
402 | ||
e2a52595 | 403 | /* load field and get context ref */ |
80c2a69a | 404 | case BYTECODE_OP_LOAD_FIELD_REF: |
80c2a69a | 405 | case BYTECODE_OP_GET_CONTEXT_REF: |
80c2a69a FD |
406 | case BYTECODE_OP_LOAD_FIELD_REF_STRING: |
407 | case BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE: | |
408 | case BYTECODE_OP_LOAD_FIELD_REF_USER_STRING: | |
409 | case BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
410 | case BYTECODE_OP_LOAD_FIELD_REF_S64: | |
411 | case BYTECODE_OP_GET_CONTEXT_REF_STRING: | |
412 | case BYTECODE_OP_GET_CONTEXT_REF_S64: | |
07dfc1d0 MD |
413 | { |
414 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) | |
415 | > start_pc + bytecode->len)) { | |
416 | ret = -ERANGE; | |
417 | } | |
418 | break; | |
419 | } | |
420 | ||
421 | /* load from immediate operand */ | |
80c2a69a FD |
422 | case BYTECODE_OP_LOAD_STRING: |
423 | case BYTECODE_OP_LOAD_STAR_GLOB_STRING: | |
07dfc1d0 MD |
424 | { |
425 | struct load_op *insn = (struct load_op *) pc; | |
426 | uint32_t str_len, maxlen; | |
427 | ||
428 | if (unlikely(pc + sizeof(struct load_op) | |
429 | > start_pc + bytecode->len)) { | |
430 | ret = -ERANGE; | |
431 | break; | |
432 | } | |
433 | ||
434 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); | |
435 | str_len = strnlen(insn->data, maxlen); | |
436 | if (unlikely(str_len >= maxlen)) { | |
437 | /* Final '\0' not found within range */ | |
438 | ret = -ERANGE; | |
439 | } | |
440 | break; | |
441 | } | |
442 | ||
80c2a69a | 443 | case BYTECODE_OP_LOAD_S64: |
07dfc1d0 MD |
444 | { |
445 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) | |
446 | > start_pc + bytecode->len)) { | |
447 | ret = -ERANGE; | |
448 | } | |
449 | break; | |
450 | } | |
451 | ||
80c2a69a FD |
452 | case BYTECODE_OP_CAST_TO_S64: |
453 | case BYTECODE_OP_CAST_NOP: | |
07dfc1d0 MD |
454 | { |
455 | if (unlikely(pc + sizeof(struct cast_op) | |
456 | > start_pc + bytecode->len)) { | |
457 | ret = -ERANGE; | |
458 | } | |
459 | break; | |
460 | } | |
461 | ||
3834b99f MD |
462 | /* |
463 | * Instructions for recursive traversal through composed types. | |
464 | */ | |
80c2a69a FD |
465 | case BYTECODE_OP_GET_CONTEXT_ROOT: |
466 | case BYTECODE_OP_GET_APP_CONTEXT_ROOT: | |
467 | case BYTECODE_OP_GET_PAYLOAD_ROOT: | |
468 | case BYTECODE_OP_LOAD_FIELD: | |
469 | case BYTECODE_OP_LOAD_FIELD_S8: | |
470 | case BYTECODE_OP_LOAD_FIELD_S16: | |
471 | case BYTECODE_OP_LOAD_FIELD_S32: | |
472 | case BYTECODE_OP_LOAD_FIELD_S64: | |
473 | case BYTECODE_OP_LOAD_FIELD_U8: | |
474 | case BYTECODE_OP_LOAD_FIELD_U16: | |
475 | case BYTECODE_OP_LOAD_FIELD_U32: | |
476 | case BYTECODE_OP_LOAD_FIELD_U64: | |
477 | case BYTECODE_OP_LOAD_FIELD_STRING: | |
478 | case BYTECODE_OP_LOAD_FIELD_SEQUENCE: | |
479 | case BYTECODE_OP_LOAD_FIELD_DOUBLE: | |
3834b99f MD |
480 | if (unlikely(pc + sizeof(struct load_op) |
481 | > start_pc + bytecode->len)) { | |
482 | ret = -ERANGE; | |
483 | } | |
484 | break; | |
485 | ||
80c2a69a | 486 | case BYTECODE_OP_GET_SYMBOL: |
3834b99f MD |
487 | { |
488 | struct load_op *insn = (struct load_op *) pc; | |
489 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
490 | ||
491 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_symbol) | |
492 | > start_pc + bytecode->len)) { | |
493 | ret = -ERANGE; | |
3aeca857 | 494 | break; |
3834b99f MD |
495 | } |
496 | ret = validate_get_symbol(bytecode, sym); | |
497 | break; | |
498 | } | |
499 | ||
80c2a69a FD |
500 | case BYTECODE_OP_GET_SYMBOL_FIELD: |
501 | printk(KERN_WARNING "LTTng: bytecode: Unexpected get symbol field\n"); | |
3834b99f MD |
502 | ret = -EINVAL; |
503 | break; | |
504 | ||
80c2a69a | 505 | case BYTECODE_OP_GET_INDEX_U16: |
3834b99f MD |
506 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u16) |
507 | > start_pc + bytecode->len)) { | |
508 | ret = -ERANGE; | |
509 | } | |
510 | break; | |
511 | ||
80c2a69a | 512 | case BYTECODE_OP_GET_INDEX_U64: |
3834b99f MD |
513 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct get_index_u64) |
514 | > start_pc + bytecode->len)) { | |
515 | ret = -ERANGE; | |
516 | } | |
517 | break; | |
07dfc1d0 MD |
518 | } |
519 | ||
520 | return ret; | |
521 | } | |
522 | ||
523 | static | |
524 | unsigned long delete_all_nodes(struct mp_table *mp_table) | |
525 | { | |
526 | struct mp_node *mp_node; | |
527 | struct hlist_node *tmp; | |
528 | unsigned long nr_nodes = 0; | |
529 | int i; | |
530 | ||
531 | for (i = 0; i < MERGE_POINT_TABLE_SIZE; i++) { | |
532 | struct hlist_head *head; | |
533 | ||
534 | head = &mp_table->mp_head[i]; | |
d216ecae | 535 | lttng_hlist_for_each_entry_safe(mp_node, tmp, head, node) { |
07dfc1d0 MD |
536 | kfree(mp_node); |
537 | nr_nodes++; | |
538 | } | |
539 | } | |
540 | return nr_nodes; | |
541 | } | |
542 | ||
543 | /* | |
544 | * Return value: | |
3834b99f | 545 | * >=0: success |
07dfc1d0 MD |
546 | * <0: error |
547 | */ | |
548 | static | |
549 | int validate_instruction_context(struct bytecode_runtime *bytecode, | |
550 | struct vstack *stack, | |
7962cb86 MD |
551 | char *start_pc, |
552 | char *pc) | |
07dfc1d0 MD |
553 | { |
554 | int ret = 0; | |
80c2a69a | 555 | const bytecode_opcode_t opcode = *(bytecode_opcode_t *) pc; |
07dfc1d0 | 556 | |
02aca193 | 557 | switch (opcode) { |
80c2a69a | 558 | case BYTECODE_OP_UNKNOWN: |
07dfc1d0 MD |
559 | default: |
560 | { | |
80c2a69a FD |
561 | printk(KERN_WARNING "LTTng: bytecode: unknown bytecode op %u\n", |
562 | (unsigned int) *(bytecode_opcode_t *) pc); | |
07dfc1d0 MD |
563 | ret = -EINVAL; |
564 | goto end; | |
565 | } | |
566 | ||
80c2a69a FD |
567 | case BYTECODE_OP_RETURN: |
568 | case BYTECODE_OP_RETURN_S64: | |
07dfc1d0 MD |
569 | { |
570 | goto end; | |
571 | } | |
572 | ||
573 | /* binary */ | |
80c2a69a FD |
574 | case BYTECODE_OP_MUL: |
575 | case BYTECODE_OP_DIV: | |
576 | case BYTECODE_OP_MOD: | |
577 | case BYTECODE_OP_PLUS: | |
578 | case BYTECODE_OP_MINUS: | |
07dfc1d0 | 579 | /* Floating point */ |
80c2a69a FD |
580 | case BYTECODE_OP_EQ_DOUBLE: |
581 | case BYTECODE_OP_NE_DOUBLE: | |
582 | case BYTECODE_OP_GT_DOUBLE: | |
583 | case BYTECODE_OP_LT_DOUBLE: | |
584 | case BYTECODE_OP_GE_DOUBLE: | |
585 | case BYTECODE_OP_LE_DOUBLE: | |
586 | case BYTECODE_OP_EQ_DOUBLE_S64: | |
587 | case BYTECODE_OP_NE_DOUBLE_S64: | |
588 | case BYTECODE_OP_GT_DOUBLE_S64: | |
589 | case BYTECODE_OP_LT_DOUBLE_S64: | |
590 | case BYTECODE_OP_GE_DOUBLE_S64: | |
591 | case BYTECODE_OP_LE_DOUBLE_S64: | |
592 | case BYTECODE_OP_EQ_S64_DOUBLE: | |
593 | case BYTECODE_OP_NE_S64_DOUBLE: | |
594 | case BYTECODE_OP_GT_S64_DOUBLE: | |
595 | case BYTECODE_OP_LT_S64_DOUBLE: | |
596 | case BYTECODE_OP_GE_S64_DOUBLE: | |
597 | case BYTECODE_OP_LE_S64_DOUBLE: | |
598 | case BYTECODE_OP_UNARY_PLUS_DOUBLE: | |
599 | case BYTECODE_OP_UNARY_MINUS_DOUBLE: | |
600 | case BYTECODE_OP_UNARY_NOT_DOUBLE: | |
601 | case BYTECODE_OP_LOAD_FIELD_REF_DOUBLE: | |
602 | case BYTECODE_OP_LOAD_DOUBLE: | |
603 | case BYTECODE_OP_CAST_DOUBLE_TO_S64: | |
604 | case BYTECODE_OP_GET_CONTEXT_REF_DOUBLE: | |
605 | { | |
606 | printk(KERN_WARNING "LTTng: bytecode: unsupported bytecode op %u\n", | |
607 | (unsigned int) *(bytecode_opcode_t *) pc); | |
07dfc1d0 MD |
608 | ret = -EINVAL; |
609 | goto end; | |
610 | } | |
611 | ||
80c2a69a | 612 | case BYTECODE_OP_EQ: |
07dfc1d0 | 613 | { |
02aca193 | 614 | ret = bin_op_compare_check(stack, opcode, "=="); |
3834b99f | 615 | if (ret < 0) |
07dfc1d0 MD |
616 | goto end; |
617 | break; | |
618 | } | |
80c2a69a | 619 | case BYTECODE_OP_NE: |
07dfc1d0 | 620 | { |
02aca193 | 621 | ret = bin_op_compare_check(stack, opcode, "!="); |
3834b99f | 622 | if (ret < 0) |
07dfc1d0 MD |
623 | goto end; |
624 | break; | |
625 | } | |
80c2a69a | 626 | case BYTECODE_OP_GT: |
07dfc1d0 | 627 | { |
02aca193 | 628 | ret = bin_op_compare_check(stack, opcode, ">"); |
3834b99f | 629 | if (ret < 0) |
07dfc1d0 MD |
630 | goto end; |
631 | break; | |
632 | } | |
80c2a69a | 633 | case BYTECODE_OP_LT: |
07dfc1d0 | 634 | { |
02aca193 | 635 | ret = bin_op_compare_check(stack, opcode, "<"); |
3834b99f | 636 | if (ret < 0) |
07dfc1d0 MD |
637 | goto end; |
638 | break; | |
639 | } | |
80c2a69a | 640 | case BYTECODE_OP_GE: |
07dfc1d0 | 641 | { |
02aca193 | 642 | ret = bin_op_compare_check(stack, opcode, ">="); |
3834b99f | 643 | if (ret < 0) |
07dfc1d0 MD |
644 | goto end; |
645 | break; | |
646 | } | |
80c2a69a | 647 | case BYTECODE_OP_LE: |
07dfc1d0 | 648 | { |
02aca193 | 649 | ret = bin_op_compare_check(stack, opcode, "<="); |
3834b99f | 650 | if (ret < 0) |
07dfc1d0 MD |
651 | goto end; |
652 | break; | |
653 | } | |
654 | ||
80c2a69a FD |
655 | case BYTECODE_OP_EQ_STRING: |
656 | case BYTECODE_OP_NE_STRING: | |
657 | case BYTECODE_OP_GT_STRING: | |
658 | case BYTECODE_OP_LT_STRING: | |
659 | case BYTECODE_OP_GE_STRING: | |
660 | case BYTECODE_OP_LE_STRING: | |
07dfc1d0 MD |
661 | { |
662 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
80c2a69a | 663 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
664 | ret = -EINVAL; |
665 | goto end; | |
666 | } | |
667 | if (vstack_ax(stack)->type != REG_STRING | |
668 | || vstack_bx(stack)->type != REG_STRING) { | |
80c2a69a | 669 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type for string comparator\n"); |
07dfc1d0 MD |
670 | ret = -EINVAL; |
671 | goto end; | |
672 | } | |
673 | break; | |
674 | } | |
675 | ||
02aca193 | 676 | |
80c2a69a FD |
677 | case BYTECODE_OP_EQ_STAR_GLOB_STRING: |
678 | case BYTECODE_OP_NE_STAR_GLOB_STRING: | |
02aca193 PP |
679 | { |
680 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
80c2a69a | 681 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
02aca193 PP |
682 | ret = -EINVAL; |
683 | goto end; | |
684 | } | |
685 | if (vstack_ax(stack)->type != REG_STAR_GLOB_STRING | |
686 | && vstack_bx(stack)->type != REG_STAR_GLOB_STRING) { | |
80c2a69a | 687 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type for globbing pattern comparator\n"); |
02aca193 PP |
688 | ret = -EINVAL; |
689 | goto end; | |
690 | } | |
691 | break; | |
692 | } | |
693 | ||
80c2a69a FD |
694 | case BYTECODE_OP_EQ_S64: |
695 | case BYTECODE_OP_NE_S64: | |
696 | case BYTECODE_OP_GT_S64: | |
697 | case BYTECODE_OP_LT_S64: | |
698 | case BYTECODE_OP_GE_S64: | |
699 | case BYTECODE_OP_LE_S64: | |
07dfc1d0 MD |
700 | { |
701 | if (!vstack_ax(stack) || !vstack_bx(stack)) { | |
80c2a69a | 702 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
703 | ret = -EINVAL; |
704 | goto end; | |
705 | } | |
1242217a FD |
706 | switch (vstack_ax(stack)->type) { |
707 | case REG_S64: | |
708 | case REG_U64: | |
709 | break; | |
710 | default: | |
80c2a69a | 711 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type for s64 comparator\n"); |
1242217a FD |
712 | ret = -EINVAL; |
713 | goto end; | |
714 | } | |
715 | switch (vstack_bx(stack)->type) { | |
716 | case REG_S64: | |
717 | case REG_U64: | |
718 | break; | |
719 | default: | |
80c2a69a | 720 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type for s64 comparator\n"); |
07dfc1d0 MD |
721 | ret = -EINVAL; |
722 | goto end; | |
723 | } | |
724 | break; | |
725 | } | |
726 | ||
80c2a69a | 727 | case BYTECODE_OP_BIT_RSHIFT: |
e16c054b MD |
728 | ret = bin_op_bitwise_check(stack, opcode, ">>"); |
729 | if (ret < 0) | |
730 | goto end; | |
731 | break; | |
80c2a69a | 732 | case BYTECODE_OP_BIT_LSHIFT: |
e16c054b MD |
733 | ret = bin_op_bitwise_check(stack, opcode, "<<"); |
734 | if (ret < 0) | |
735 | goto end; | |
736 | break; | |
80c2a69a | 737 | case BYTECODE_OP_BIT_AND: |
3834b99f MD |
738 | ret = bin_op_bitwise_check(stack, opcode, "&"); |
739 | if (ret < 0) | |
740 | goto end; | |
741 | break; | |
80c2a69a | 742 | case BYTECODE_OP_BIT_OR: |
3834b99f MD |
743 | ret = bin_op_bitwise_check(stack, opcode, "|"); |
744 | if (ret < 0) | |
745 | goto end; | |
746 | break; | |
80c2a69a | 747 | case BYTECODE_OP_BIT_XOR: |
3834b99f MD |
748 | ret = bin_op_bitwise_check(stack, opcode, "^"); |
749 | if (ret < 0) | |
750 | goto end; | |
751 | break; | |
752 | ||
07dfc1d0 | 753 | /* unary */ |
80c2a69a FD |
754 | case BYTECODE_OP_UNARY_PLUS: |
755 | case BYTECODE_OP_UNARY_MINUS: | |
756 | case BYTECODE_OP_UNARY_NOT: | |
07dfc1d0 MD |
757 | { |
758 | if (!vstack_ax(stack)) { | |
80c2a69a | 759 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
760 | ret = -EINVAL; |
761 | goto end; | |
762 | } | |
763 | switch (vstack_ax(stack)->type) { | |
764 | default: | |
765 | case REG_DOUBLE: | |
80c2a69a | 766 | printk(KERN_WARNING "LTTng: bytecode: unknown register type\n"); |
07dfc1d0 MD |
767 | ret = -EINVAL; |
768 | goto end; | |
769 | ||
770 | case REG_STRING: | |
02aca193 | 771 | case REG_STAR_GLOB_STRING: |
80c2a69a | 772 | printk(KERN_WARNING "LTTng: bytecode: Unary op can only be applied to numeric or floating point registers\n"); |
07dfc1d0 MD |
773 | ret = -EINVAL; |
774 | goto end; | |
775 | case REG_S64: | |
1242217a | 776 | case REG_U64: |
3834b99f | 777 | case REG_TYPE_UNKNOWN: |
07dfc1d0 MD |
778 | break; |
779 | } | |
780 | break; | |
781 | } | |
80c2a69a | 782 | case BYTECODE_OP_UNARY_BIT_NOT: |
e16c054b MD |
783 | { |
784 | if (!vstack_ax(stack)) { | |
80c2a69a | 785 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
e16c054b MD |
786 | ret = -EINVAL; |
787 | goto end; | |
788 | } | |
789 | switch (vstack_ax(stack)->type) { | |
790 | default: | |
80c2a69a | 791 | printk(KERN_WARNING "LTTng: bytecode: unknown register type\n"); |
e16c054b MD |
792 | ret = -EINVAL; |
793 | goto end; | |
794 | ||
795 | case REG_STRING: | |
796 | case REG_STAR_GLOB_STRING: | |
797 | case REG_DOUBLE: | |
80c2a69a | 798 | printk(KERN_WARNING "LTTng: bytecode: Unary bitwise op can only be applied to numeric registers\n"); |
e16c054b MD |
799 | ret = -EINVAL; |
800 | goto end; | |
801 | case REG_S64: | |
1242217a | 802 | case REG_U64: |
e16c054b MD |
803 | case REG_TYPE_UNKNOWN: |
804 | break; | |
805 | } | |
806 | break; | |
807 | } | |
07dfc1d0 | 808 | |
80c2a69a FD |
809 | case BYTECODE_OP_UNARY_PLUS_S64: |
810 | case BYTECODE_OP_UNARY_MINUS_S64: | |
811 | case BYTECODE_OP_UNARY_NOT_S64: | |
07dfc1d0 MD |
812 | { |
813 | if (!vstack_ax(stack)) { | |
80c2a69a | 814 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
815 | ret = -EINVAL; |
816 | goto end; | |
817 | } | |
1242217a FD |
818 | if (vstack_ax(stack)->type != REG_S64 && |
819 | vstack_ax(stack)->type != REG_U64) { | |
80c2a69a | 820 | printk(KERN_WARNING "LTTng: bytecode: Invalid register type\n"); |
07dfc1d0 MD |
821 | ret = -EINVAL; |
822 | goto end; | |
823 | } | |
824 | break; | |
825 | } | |
826 | ||
827 | /* logical */ | |
80c2a69a FD |
828 | case BYTECODE_OP_AND: |
829 | case BYTECODE_OP_OR: | |
07dfc1d0 MD |
830 | { |
831 | struct logical_op *insn = (struct logical_op *) pc; | |
832 | ||
833 | if (!vstack_ax(stack)) { | |
80c2a69a | 834 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
835 | ret = -EINVAL; |
836 | goto end; | |
837 | } | |
1242217a FD |
838 | if (vstack_ax(stack)->type != REG_S64 && |
839 | vstack_ax(stack)->type != REG_U64) { | |
80c2a69a | 840 | printk(KERN_WARNING "LTTng: bytecode: Logical comparator expects S64 register\n"); |
07dfc1d0 MD |
841 | ret = -EINVAL; |
842 | goto end; | |
843 | } | |
844 | ||
845 | dbg_printk("Validate jumping to bytecode offset %u\n", | |
846 | (unsigned int) insn->skip_offset); | |
847 | if (unlikely(start_pc + insn->skip_offset <= pc)) { | |
80c2a69a | 848 | printk(KERN_WARNING "LTTng: bytecode: Loops are not allowed in bytecode\n"); |
07dfc1d0 MD |
849 | ret = -EINVAL; |
850 | goto end; | |
851 | } | |
852 | break; | |
853 | } | |
854 | ||
855 | /* load field ref */ | |
80c2a69a | 856 | case BYTECODE_OP_LOAD_FIELD_REF: |
07dfc1d0 | 857 | { |
80c2a69a | 858 | printk(KERN_WARNING "LTTng: bytecode: Unknown field ref type\n"); |
07dfc1d0 MD |
859 | ret = -EINVAL; |
860 | goto end; | |
861 | } | |
80c2a69a FD |
862 | case BYTECODE_OP_LOAD_FIELD_REF_STRING: |
863 | case BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE: | |
864 | case BYTECODE_OP_LOAD_FIELD_REF_USER_STRING: | |
865 | case BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
866 | { |
867 | struct load_op *insn = (struct load_op *) pc; | |
868 | struct field_ref *ref = (struct field_ref *) insn->data; | |
869 | ||
870 | dbg_printk("Validate load field ref offset %u type string\n", | |
871 | ref->offset); | |
872 | break; | |
873 | } | |
80c2a69a | 874 | case BYTECODE_OP_LOAD_FIELD_REF_S64: |
07dfc1d0 MD |
875 | { |
876 | struct load_op *insn = (struct load_op *) pc; | |
877 | struct field_ref *ref = (struct field_ref *) insn->data; | |
878 | ||
879 | dbg_printk("Validate load field ref offset %u type s64\n", | |
880 | ref->offset); | |
881 | break; | |
882 | } | |
883 | ||
884 | /* load from immediate operand */ | |
80c2a69a FD |
885 | case BYTECODE_OP_LOAD_STRING: |
886 | case BYTECODE_OP_LOAD_STAR_GLOB_STRING: | |
07dfc1d0 MD |
887 | { |
888 | break; | |
889 | } | |
890 | ||
80c2a69a | 891 | case BYTECODE_OP_LOAD_S64: |
07dfc1d0 MD |
892 | { |
893 | break; | |
894 | } | |
895 | ||
80c2a69a | 896 | case BYTECODE_OP_CAST_TO_S64: |
07dfc1d0 MD |
897 | { |
898 | struct cast_op *insn = (struct cast_op *) pc; | |
899 | ||
900 | if (!vstack_ax(stack)) { | |
80c2a69a | 901 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
902 | ret = -EINVAL; |
903 | goto end; | |
904 | } | |
905 | switch (vstack_ax(stack)->type) { | |
906 | default: | |
907 | case REG_DOUBLE: | |
80c2a69a | 908 | printk(KERN_WARNING "LTTng: bytecode: unknown register type\n"); |
07dfc1d0 MD |
909 | ret = -EINVAL; |
910 | goto end; | |
911 | ||
912 | case REG_STRING: | |
02aca193 | 913 | case REG_STAR_GLOB_STRING: |
80c2a69a | 914 | printk(KERN_WARNING "LTTng: bytecode: Cast op can only be applied to numeric or floating point registers\n"); |
07dfc1d0 MD |
915 | ret = -EINVAL; |
916 | goto end; | |
917 | case REG_S64: | |
918 | break; | |
919 | } | |
80c2a69a | 920 | if (insn->op == BYTECODE_OP_CAST_DOUBLE_TO_S64) { |
07dfc1d0 | 921 | if (vstack_ax(stack)->type != REG_DOUBLE) { |
80c2a69a | 922 | printk(KERN_WARNING "LTTng: bytecode: Cast expects double\n"); |
07dfc1d0 MD |
923 | ret = -EINVAL; |
924 | goto end; | |
925 | } | |
926 | } | |
927 | break; | |
928 | } | |
80c2a69a | 929 | case BYTECODE_OP_CAST_NOP: |
07dfc1d0 MD |
930 | { |
931 | break; | |
932 | } | |
933 | ||
934 | /* get context ref */ | |
80c2a69a | 935 | case BYTECODE_OP_GET_CONTEXT_REF: |
07dfc1d0 | 936 | { |
80c2a69a | 937 | printk(KERN_WARNING "LTTng: bytecode: Unknown get context ref type\n"); |
07dfc1d0 MD |
938 | ret = -EINVAL; |
939 | goto end; | |
940 | } | |
80c2a69a | 941 | case BYTECODE_OP_GET_CONTEXT_REF_STRING: |
07dfc1d0 MD |
942 | { |
943 | struct load_op *insn = (struct load_op *) pc; | |
944 | struct field_ref *ref = (struct field_ref *) insn->data; | |
945 | ||
946 | dbg_printk("Validate get context ref offset %u type string\n", | |
947 | ref->offset); | |
948 | break; | |
949 | } | |
80c2a69a | 950 | case BYTECODE_OP_GET_CONTEXT_REF_S64: |
07dfc1d0 MD |
951 | { |
952 | struct load_op *insn = (struct load_op *) pc; | |
953 | struct field_ref *ref = (struct field_ref *) insn->data; | |
954 | ||
955 | dbg_printk("Validate get context ref offset %u type s64\n", | |
956 | ref->offset); | |
957 | break; | |
958 | } | |
959 | ||
3834b99f MD |
960 | /* |
961 | * Instructions for recursive traversal through composed types. | |
962 | */ | |
80c2a69a | 963 | case BYTECODE_OP_GET_CONTEXT_ROOT: |
3834b99f MD |
964 | { |
965 | dbg_printk("Validate get context root\n"); | |
966 | break; | |
967 | } | |
80c2a69a | 968 | case BYTECODE_OP_GET_APP_CONTEXT_ROOT: |
3834b99f MD |
969 | { |
970 | dbg_printk("Validate get app context root\n"); | |
971 | break; | |
972 | } | |
80c2a69a | 973 | case BYTECODE_OP_GET_PAYLOAD_ROOT: |
3834b99f MD |
974 | { |
975 | dbg_printk("Validate get payload root\n"); | |
976 | break; | |
977 | } | |
80c2a69a | 978 | case BYTECODE_OP_LOAD_FIELD: |
3834b99f MD |
979 | { |
980 | /* | |
981 | * We tolerate that field type is unknown at validation, | |
982 | * because we are performing the load specialization in | |
983 | * a phase after validation. | |
984 | */ | |
985 | dbg_printk("Validate load field\n"); | |
986 | break; | |
987 | } | |
c4bf9003 MD |
988 | |
989 | /* | |
990 | * Disallow already specialized bytecode op load field instructions to | |
991 | * ensure that the received bytecode does not: | |
992 | * | |
993 | * - Read user-space memory without proper get_user accessors, | |
994 | * - Read a memory area larger than the memory targeted by the instrumentation. | |
995 | */ | |
80c2a69a | 996 | case BYTECODE_OP_LOAD_FIELD_S8: |
80c2a69a | 997 | case BYTECODE_OP_LOAD_FIELD_S16: |
80c2a69a | 998 | case BYTECODE_OP_LOAD_FIELD_S32: |
80c2a69a | 999 | case BYTECODE_OP_LOAD_FIELD_S64: |
80c2a69a | 1000 | case BYTECODE_OP_LOAD_FIELD_U8: |
80c2a69a | 1001 | case BYTECODE_OP_LOAD_FIELD_U16: |
80c2a69a | 1002 | case BYTECODE_OP_LOAD_FIELD_U32: |
80c2a69a | 1003 | case BYTECODE_OP_LOAD_FIELD_U64: |
80c2a69a | 1004 | case BYTECODE_OP_LOAD_FIELD_STRING: |
80c2a69a | 1005 | case BYTECODE_OP_LOAD_FIELD_SEQUENCE: |
80c2a69a | 1006 | case BYTECODE_OP_LOAD_FIELD_DOUBLE: |
3834b99f | 1007 | { |
c4bf9003 MD |
1008 | dbg_printk("Validate load field, reject specialized load instruction (%d)\n", |
1009 | (int) opcode); | |
1010 | ret = -EINVAL; | |
1011 | goto end; | |
3834b99f MD |
1012 | } |
1013 | ||
80c2a69a | 1014 | case BYTECODE_OP_GET_SYMBOL: |
3834b99f MD |
1015 | { |
1016 | struct load_op *insn = (struct load_op *) pc; | |
1017 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1018 | ||
1019 | dbg_printk("Validate get symbol offset %u\n", sym->offset); | |
1020 | break; | |
1021 | } | |
1022 | ||
80c2a69a | 1023 | case BYTECODE_OP_GET_SYMBOL_FIELD: |
3834b99f MD |
1024 | { |
1025 | struct load_op *insn = (struct load_op *) pc; | |
1026 | struct get_symbol *sym = (struct get_symbol *) insn->data; | |
1027 | ||
1028 | dbg_printk("Validate get symbol field offset %u\n", sym->offset); | |
1029 | break; | |
1030 | } | |
1031 | ||
80c2a69a | 1032 | case BYTECODE_OP_GET_INDEX_U16: |
3834b99f MD |
1033 | { |
1034 | struct load_op *insn = (struct load_op *) pc; | |
1035 | struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data; | |
1036 | ||
1037 | dbg_printk("Validate get index u16 index %u\n", get_index->index); | |
1038 | break; | |
1039 | } | |
1040 | ||
80c2a69a | 1041 | case BYTECODE_OP_GET_INDEX_U64: |
3834b99f MD |
1042 | { |
1043 | struct load_op *insn = (struct load_op *) pc; | |
1044 | struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data; | |
1045 | ||
1046 | dbg_printk("Validate get index u64 index %llu\n", | |
1047 | (unsigned long long) get_index->index); | |
1048 | break; | |
1049 | } | |
07dfc1d0 MD |
1050 | } |
1051 | end: | |
1052 | return ret; | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Return value: | |
1057 | * 0: success | |
1058 | * <0: error | |
1059 | */ | |
1060 | static | |
1061 | int validate_instruction_all_contexts(struct bytecode_runtime *bytecode, | |
1062 | struct mp_table *mp_table, | |
1063 | struct vstack *stack, | |
7962cb86 MD |
1064 | char *start_pc, |
1065 | char *pc) | |
07dfc1d0 MD |
1066 | { |
1067 | int ret, found = 0; | |
1068 | unsigned long target_pc = pc - start_pc; | |
1069 | unsigned long hash; | |
1070 | struct hlist_head *head; | |
1071 | struct mp_node *mp_node; | |
1072 | ||
1073 | /* Validate the context resulting from the previous instruction */ | |
1074 | ret = validate_instruction_context(bytecode, stack, start_pc, pc); | |
3834b99f | 1075 | if (ret < 0) |
07dfc1d0 MD |
1076 | return ret; |
1077 | ||
1078 | /* Validate merge points */ | |
1079 | hash = jhash_1word(target_pc, 0); | |
1080 | head = &mp_table->mp_head[hash & (MERGE_POINT_TABLE_SIZE - 1)]; | |
d216ecae | 1081 | lttng_hlist_for_each_entry(mp_node, head, node) { |
07dfc1d0 MD |
1082 | if (lttng_hash_match(mp_node, target_pc)) { |
1083 | found = 1; | |
1084 | break; | |
1085 | } | |
1086 | } | |
1087 | if (found) { | |
80c2a69a | 1088 | dbg_printk("Bytecode: validate merge point at offset %lu\n", |
07dfc1d0 MD |
1089 | target_pc); |
1090 | if (merge_points_compare(stack, &mp_node->stack)) { | |
80c2a69a | 1091 | printk(KERN_WARNING "LTTng: bytecode: Merge points differ for offset %lu\n", |
07dfc1d0 MD |
1092 | target_pc); |
1093 | return -EINVAL; | |
1094 | } | |
1095 | /* Once validated, we can remove the merge point */ | |
80c2a69a | 1096 | dbg_printk("Bytecode: remove merge point at offset %lu\n", |
07dfc1d0 MD |
1097 | target_pc); |
1098 | hlist_del(&mp_node->node); | |
1099 | } | |
1100 | return 0; | |
1101 | } | |
1102 | ||
e2a52595 MD |
1103 | /* |
1104 | * Validate load instructions: specialized instructions not accepted as input. | |
1105 | * | |
1106 | * Return value: | |
1107 | * >0: going to next insn. | |
1108 | * 0: success, stop iteration. | |
1109 | * <0: error | |
1110 | */ | |
1111 | static | |
1112 | int validate_load(char **_next_pc, | |
1113 | char *pc) | |
1114 | { | |
1115 | int ret = 0; | |
1116 | char *next_pc = *_next_pc; | |
1117 | ||
1118 | switch (*(bytecode_opcode_t *) pc) { | |
1119 | case BYTECODE_OP_UNKNOWN: | |
1120 | default: | |
1121 | { | |
1122 | printk(KERN_WARNING "LTTng: bytecode: unknown bytecode op %u\n", | |
1123 | (unsigned int) *(bytecode_opcode_t *) pc); | |
1124 | ret = -EINVAL; | |
1125 | goto end; | |
1126 | } | |
1127 | ||
1128 | case BYTECODE_OP_RETURN: | |
1129 | { | |
1130 | next_pc += sizeof(struct return_op); | |
1131 | break; | |
1132 | } | |
1133 | ||
1134 | case BYTECODE_OP_RETURN_S64: | |
1135 | { | |
1136 | next_pc += sizeof(struct return_op); | |
1137 | break; | |
1138 | } | |
1139 | ||
1140 | /* binary */ | |
1141 | case BYTECODE_OP_MUL: | |
1142 | case BYTECODE_OP_DIV: | |
1143 | case BYTECODE_OP_MOD: | |
1144 | case BYTECODE_OP_PLUS: | |
1145 | case BYTECODE_OP_MINUS: | |
1146 | /* Floating point */ | |
1147 | case BYTECODE_OP_EQ_DOUBLE: | |
1148 | case BYTECODE_OP_NE_DOUBLE: | |
1149 | case BYTECODE_OP_GT_DOUBLE: | |
1150 | case BYTECODE_OP_LT_DOUBLE: | |
1151 | case BYTECODE_OP_GE_DOUBLE: | |
1152 | case BYTECODE_OP_LE_DOUBLE: | |
1153 | case BYTECODE_OP_EQ_DOUBLE_S64: | |
1154 | case BYTECODE_OP_NE_DOUBLE_S64: | |
1155 | case BYTECODE_OP_GT_DOUBLE_S64: | |
1156 | case BYTECODE_OP_LT_DOUBLE_S64: | |
1157 | case BYTECODE_OP_GE_DOUBLE_S64: | |
1158 | case BYTECODE_OP_LE_DOUBLE_S64: | |
1159 | case BYTECODE_OP_EQ_S64_DOUBLE: | |
1160 | case BYTECODE_OP_NE_S64_DOUBLE: | |
1161 | case BYTECODE_OP_GT_S64_DOUBLE: | |
1162 | case BYTECODE_OP_LT_S64_DOUBLE: | |
1163 | case BYTECODE_OP_GE_S64_DOUBLE: | |
1164 | case BYTECODE_OP_LE_S64_DOUBLE: | |
1165 | case BYTECODE_OP_UNARY_PLUS_DOUBLE: | |
1166 | case BYTECODE_OP_UNARY_MINUS_DOUBLE: | |
1167 | case BYTECODE_OP_UNARY_NOT_DOUBLE: | |
1168 | case BYTECODE_OP_LOAD_FIELD_REF_DOUBLE: | |
1169 | case BYTECODE_OP_GET_CONTEXT_REF_DOUBLE: | |
1170 | case BYTECODE_OP_LOAD_DOUBLE: | |
1171 | case BYTECODE_OP_CAST_DOUBLE_TO_S64: | |
1172 | { | |
1173 | printk(KERN_WARNING "LTTng: bytecode: unsupported bytecode op %u\n", | |
1174 | (unsigned int) *(bytecode_opcode_t *) pc); | |
1175 | ret = -EINVAL; | |
1176 | goto end; | |
1177 | } | |
1178 | ||
1179 | case BYTECODE_OP_EQ: | |
1180 | case BYTECODE_OP_NE: | |
1181 | case BYTECODE_OP_GT: | |
1182 | case BYTECODE_OP_LT: | |
1183 | case BYTECODE_OP_GE: | |
1184 | case BYTECODE_OP_LE: | |
1185 | case BYTECODE_OP_EQ_STRING: | |
1186 | case BYTECODE_OP_NE_STRING: | |
1187 | case BYTECODE_OP_GT_STRING: | |
1188 | case BYTECODE_OP_LT_STRING: | |
1189 | case BYTECODE_OP_GE_STRING: | |
1190 | case BYTECODE_OP_LE_STRING: | |
1191 | case BYTECODE_OP_EQ_STAR_GLOB_STRING: | |
1192 | case BYTECODE_OP_NE_STAR_GLOB_STRING: | |
1193 | case BYTECODE_OP_EQ_S64: | |
1194 | case BYTECODE_OP_NE_S64: | |
1195 | case BYTECODE_OP_GT_S64: | |
1196 | case BYTECODE_OP_LT_S64: | |
1197 | case BYTECODE_OP_GE_S64: | |
1198 | case BYTECODE_OP_LE_S64: | |
1199 | case BYTECODE_OP_BIT_RSHIFT: | |
1200 | case BYTECODE_OP_BIT_LSHIFT: | |
1201 | case BYTECODE_OP_BIT_AND: | |
1202 | case BYTECODE_OP_BIT_OR: | |
1203 | case BYTECODE_OP_BIT_XOR: | |
1204 | { | |
1205 | next_pc += sizeof(struct binary_op); | |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | /* unary */ | |
1210 | case BYTECODE_OP_UNARY_PLUS: | |
1211 | case BYTECODE_OP_UNARY_MINUS: | |
1212 | case BYTECODE_OP_UNARY_PLUS_S64: | |
1213 | case BYTECODE_OP_UNARY_MINUS_S64: | |
1214 | case BYTECODE_OP_UNARY_NOT_S64: | |
1215 | case BYTECODE_OP_UNARY_NOT: | |
1216 | case BYTECODE_OP_UNARY_BIT_NOT: | |
1217 | { | |
1218 | next_pc += sizeof(struct unary_op); | |
1219 | break; | |
1220 | } | |
1221 | ||
1222 | /* logical */ | |
1223 | case BYTECODE_OP_AND: | |
1224 | case BYTECODE_OP_OR: | |
1225 | { | |
1226 | next_pc += sizeof(struct logical_op); | |
1227 | break; | |
1228 | } | |
1229 | ||
1230 | /* load field ref */ | |
1231 | case BYTECODE_OP_LOAD_FIELD_REF: | |
1232 | /* get context ref */ | |
1233 | case BYTECODE_OP_GET_CONTEXT_REF: | |
1234 | { | |
1235 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1236 | break; | |
1237 | } | |
1238 | case BYTECODE_OP_LOAD_FIELD_REF_STRING: | |
1239 | case BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE: | |
1240 | case BYTECODE_OP_GET_CONTEXT_REF_STRING: | |
1241 | case BYTECODE_OP_LOAD_FIELD_REF_USER_STRING: | |
1242 | case BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
1243 | case BYTECODE_OP_LOAD_FIELD_REF_S64: | |
1244 | case BYTECODE_OP_GET_CONTEXT_REF_S64: | |
1245 | { | |
1246 | /* | |
1247 | * Reject specialized load field ref instructions. | |
1248 | */ | |
1249 | ret = -EINVAL; | |
1250 | goto end; | |
1251 | } | |
1252 | ||
1253 | /* load from immediate operand */ | |
1254 | case BYTECODE_OP_LOAD_STRING: | |
1255 | case BYTECODE_OP_LOAD_STAR_GLOB_STRING: | |
1256 | { | |
1257 | struct load_op *insn = (struct load_op *) pc; | |
1258 | ||
1259 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
1260 | break; | |
1261 | } | |
1262 | ||
1263 | case BYTECODE_OP_LOAD_S64: | |
1264 | { | |
1265 | next_pc += sizeof(struct load_op) + sizeof(struct literal_numeric); | |
1266 | break; | |
1267 | } | |
1268 | ||
1269 | case BYTECODE_OP_CAST_TO_S64: | |
1270 | case BYTECODE_OP_CAST_NOP: | |
1271 | { | |
1272 | next_pc += sizeof(struct cast_op); | |
1273 | break; | |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * Instructions for recursive traversal through composed types. | |
1278 | */ | |
1279 | case BYTECODE_OP_GET_CONTEXT_ROOT: | |
1280 | case BYTECODE_OP_GET_APP_CONTEXT_ROOT: | |
1281 | case BYTECODE_OP_GET_PAYLOAD_ROOT: | |
1282 | case BYTECODE_OP_LOAD_FIELD: | |
1283 | { | |
1284 | next_pc += sizeof(struct load_op); | |
1285 | break; | |
1286 | } | |
1287 | ||
1288 | case BYTECODE_OP_LOAD_FIELD_S8: | |
1289 | case BYTECODE_OP_LOAD_FIELD_S16: | |
1290 | case BYTECODE_OP_LOAD_FIELD_S32: | |
1291 | case BYTECODE_OP_LOAD_FIELD_S64: | |
1292 | case BYTECODE_OP_LOAD_FIELD_U8: | |
1293 | case BYTECODE_OP_LOAD_FIELD_U16: | |
1294 | case BYTECODE_OP_LOAD_FIELD_U32: | |
1295 | case BYTECODE_OP_LOAD_FIELD_U64: | |
1296 | case BYTECODE_OP_LOAD_FIELD_STRING: | |
1297 | case BYTECODE_OP_LOAD_FIELD_SEQUENCE: | |
1298 | case BYTECODE_OP_LOAD_FIELD_DOUBLE: | |
1299 | { | |
1300 | /* | |
1301 | * Reject specialized load field instructions. | |
1302 | */ | |
1303 | ret = -EINVAL; | |
1304 | goto end; | |
1305 | } | |
1306 | ||
1307 | case BYTECODE_OP_GET_SYMBOL: | |
1308 | case BYTECODE_OP_GET_SYMBOL_FIELD: | |
1309 | { | |
1310 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); | |
1311 | break; | |
1312 | } | |
1313 | ||
1314 | case BYTECODE_OP_GET_INDEX_U16: | |
1315 | { | |
1316 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); | |
1317 | break; | |
1318 | } | |
1319 | ||
1320 | case BYTECODE_OP_GET_INDEX_U64: | |
1321 | { | |
1322 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); | |
1323 | break; | |
1324 | } | |
1325 | ||
1326 | } | |
1327 | end: | |
1328 | *_next_pc = next_pc; | |
1329 | return ret; | |
1330 | } | |
1331 | ||
07dfc1d0 MD |
1332 | /* |
1333 | * Return value: | |
1334 | * >0: going to next insn. | |
1335 | * 0: success, stop iteration. | |
1336 | * <0: error | |
1337 | */ | |
1338 | static | |
1339 | int exec_insn(struct bytecode_runtime *bytecode, | |
1340 | struct mp_table *mp_table, | |
1341 | struct vstack *stack, | |
7962cb86 MD |
1342 | char **_next_pc, |
1343 | char *pc) | |
07dfc1d0 MD |
1344 | { |
1345 | int ret = 1; | |
7962cb86 | 1346 | char *next_pc = *_next_pc; |
07dfc1d0 | 1347 | |
80c2a69a FD |
1348 | switch (*(bytecode_opcode_t *) pc) { |
1349 | case BYTECODE_OP_UNKNOWN: | |
07dfc1d0 MD |
1350 | default: |
1351 | { | |
80c2a69a FD |
1352 | printk(KERN_WARNING "LTTng: bytecode: unknown bytecode op %u\n", |
1353 | (unsigned int) *(bytecode_opcode_t *) pc); | |
07dfc1d0 MD |
1354 | ret = -EINVAL; |
1355 | goto end; | |
1356 | } | |
1357 | ||
80c2a69a | 1358 | case BYTECODE_OP_RETURN: |
07dfc1d0 MD |
1359 | { |
1360 | if (!vstack_ax(stack)) { | |
80c2a69a | 1361 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
1362 | ret = -EINVAL; |
1363 | goto end; | |
1364 | } | |
3834b99f MD |
1365 | switch (vstack_ax(stack)->type) { |
1366 | case REG_S64: | |
1242217a | 1367 | case REG_U64: |
fd41f360 FD |
1368 | case REG_DOUBLE: |
1369 | case REG_STRING: | |
1370 | case REG_PTR: | |
3834b99f MD |
1371 | case REG_TYPE_UNKNOWN: |
1372 | break; | |
1373 | default: | |
80c2a69a | 1374 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type %d at end of bytecode\n", |
3834b99f MD |
1375 | (int) vstack_ax(stack)->type); |
1376 | ret = -EINVAL; | |
1377 | goto end; | |
1378 | } | |
1379 | ||
07dfc1d0 MD |
1380 | ret = 0; |
1381 | goto end; | |
1382 | } | |
1383 | ||
80c2a69a | 1384 | case BYTECODE_OP_RETURN_S64: |
57ba4b41 MD |
1385 | { |
1386 | if (!vstack_ax(stack)) { | |
80c2a69a | 1387 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
57ba4b41 MD |
1388 | ret = -EINVAL; |
1389 | goto end; | |
1390 | } | |
1391 | switch (vstack_ax(stack)->type) { | |
1392 | case REG_S64: | |
1242217a | 1393 | case REG_U64: |
57ba4b41 MD |
1394 | break; |
1395 | default: | |
1396 | case REG_TYPE_UNKNOWN: | |
80c2a69a | 1397 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type %d at end of bytecode\n", |
57ba4b41 MD |
1398 | (int) vstack_ax(stack)->type); |
1399 | ret = -EINVAL; | |
1400 | goto end; | |
1401 | } | |
1402 | ||
1403 | ret = 0; | |
1404 | goto end; | |
1405 | } | |
1406 | ||
07dfc1d0 | 1407 | /* binary */ |
80c2a69a FD |
1408 | case BYTECODE_OP_MUL: |
1409 | case BYTECODE_OP_DIV: | |
1410 | case BYTECODE_OP_MOD: | |
1411 | case BYTECODE_OP_PLUS: | |
1412 | case BYTECODE_OP_MINUS: | |
07dfc1d0 | 1413 | /* Floating point */ |
80c2a69a FD |
1414 | case BYTECODE_OP_EQ_DOUBLE: |
1415 | case BYTECODE_OP_NE_DOUBLE: | |
1416 | case BYTECODE_OP_GT_DOUBLE: | |
1417 | case BYTECODE_OP_LT_DOUBLE: | |
1418 | case BYTECODE_OP_GE_DOUBLE: | |
1419 | case BYTECODE_OP_LE_DOUBLE: | |
1420 | case BYTECODE_OP_EQ_DOUBLE_S64: | |
1421 | case BYTECODE_OP_NE_DOUBLE_S64: | |
1422 | case BYTECODE_OP_GT_DOUBLE_S64: | |
1423 | case BYTECODE_OP_LT_DOUBLE_S64: | |
1424 | case BYTECODE_OP_GE_DOUBLE_S64: | |
1425 | case BYTECODE_OP_LE_DOUBLE_S64: | |
1426 | case BYTECODE_OP_EQ_S64_DOUBLE: | |
1427 | case BYTECODE_OP_NE_S64_DOUBLE: | |
1428 | case BYTECODE_OP_GT_S64_DOUBLE: | |
1429 | case BYTECODE_OP_LT_S64_DOUBLE: | |
1430 | case BYTECODE_OP_GE_S64_DOUBLE: | |
1431 | case BYTECODE_OP_LE_S64_DOUBLE: | |
1432 | case BYTECODE_OP_UNARY_PLUS_DOUBLE: | |
1433 | case BYTECODE_OP_UNARY_MINUS_DOUBLE: | |
1434 | case BYTECODE_OP_UNARY_NOT_DOUBLE: | |
1435 | case BYTECODE_OP_LOAD_FIELD_REF_DOUBLE: | |
1436 | case BYTECODE_OP_GET_CONTEXT_REF_DOUBLE: | |
1437 | case BYTECODE_OP_LOAD_DOUBLE: | |
1438 | case BYTECODE_OP_CAST_DOUBLE_TO_S64: | |
1439 | { | |
1440 | printk(KERN_WARNING "LTTng: bytecode: unsupported bytecode op %u\n", | |
1441 | (unsigned int) *(bytecode_opcode_t *) pc); | |
07dfc1d0 MD |
1442 | ret = -EINVAL; |
1443 | goto end; | |
1444 | } | |
1445 | ||
80c2a69a FD |
1446 | case BYTECODE_OP_EQ: |
1447 | case BYTECODE_OP_NE: | |
1448 | case BYTECODE_OP_GT: | |
1449 | case BYTECODE_OP_LT: | |
1450 | case BYTECODE_OP_GE: | |
1451 | case BYTECODE_OP_LE: | |
1452 | case BYTECODE_OP_EQ_STRING: | |
1453 | case BYTECODE_OP_NE_STRING: | |
1454 | case BYTECODE_OP_GT_STRING: | |
1455 | case BYTECODE_OP_LT_STRING: | |
1456 | case BYTECODE_OP_GE_STRING: | |
1457 | case BYTECODE_OP_LE_STRING: | |
1458 | case BYTECODE_OP_EQ_STAR_GLOB_STRING: | |
1459 | case BYTECODE_OP_NE_STAR_GLOB_STRING: | |
1460 | case BYTECODE_OP_EQ_S64: | |
1461 | case BYTECODE_OP_NE_S64: | |
1462 | case BYTECODE_OP_GT_S64: | |
1463 | case BYTECODE_OP_LT_S64: | |
1464 | case BYTECODE_OP_GE_S64: | |
1465 | case BYTECODE_OP_LE_S64: | |
1242217a FD |
1466 | { |
1467 | /* Pop 2, push 1 */ | |
1468 | if (vstack_pop(stack)) { | |
1469 | ret = -EINVAL; | |
1470 | goto end; | |
1471 | } | |
1472 | if (!vstack_ax(stack)) { | |
1473 | printk(KERN_WARNING "Empty stack\n"); | |
1474 | ret = -EINVAL; | |
1475 | goto end; | |
1476 | } | |
1477 | switch (vstack_ax(stack)->type) { | |
1478 | case REG_S64: | |
1479 | case REG_U64: | |
1480 | case REG_DOUBLE: | |
1481 | case REG_STRING: | |
1482 | case REG_STAR_GLOB_STRING: | |
1483 | case REG_TYPE_UNKNOWN: | |
1484 | break; | |
1485 | default: | |
1486 | printk(KERN_WARNING "Unexpected register type %d for operation\n", | |
1487 | (int) vstack_ax(stack)->type); | |
1488 | ret = -EINVAL; | |
1489 | goto end; | |
1490 | } | |
1491 | ||
1492 | vstack_ax(stack)->type = REG_S64; | |
1493 | next_pc += sizeof(struct binary_op); | |
1494 | break; | |
1495 | } | |
80c2a69a FD |
1496 | case BYTECODE_OP_BIT_RSHIFT: |
1497 | case BYTECODE_OP_BIT_LSHIFT: | |
1498 | case BYTECODE_OP_BIT_AND: | |
1499 | case BYTECODE_OP_BIT_OR: | |
1500 | case BYTECODE_OP_BIT_XOR: | |
07dfc1d0 MD |
1501 | { |
1502 | /* Pop 2, push 1 */ | |
1503 | if (vstack_pop(stack)) { | |
1504 | ret = -EINVAL; | |
1505 | goto end; | |
1506 | } | |
1507 | if (!vstack_ax(stack)) { | |
80c2a69a | 1508 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
1509 | ret = -EINVAL; |
1510 | goto end; | |
1511 | } | |
3834b99f MD |
1512 | switch (vstack_ax(stack)->type) { |
1513 | case REG_S64: | |
1242217a | 1514 | case REG_U64: |
3834b99f MD |
1515 | case REG_DOUBLE: |
1516 | case REG_STRING: | |
1517 | case REG_STAR_GLOB_STRING: | |
1518 | case REG_TYPE_UNKNOWN: | |
1519 | break; | |
1520 | default: | |
80c2a69a | 1521 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type %d for operation\n", |
3834b99f MD |
1522 | (int) vstack_ax(stack)->type); |
1523 | ret = -EINVAL; | |
1524 | goto end; | |
1525 | } | |
1526 | ||
1242217a | 1527 | vstack_ax(stack)->type = REG_U64; |
07dfc1d0 MD |
1528 | next_pc += sizeof(struct binary_op); |
1529 | break; | |
1530 | } | |
1531 | ||
1532 | /* unary */ | |
80c2a69a FD |
1533 | case BYTECODE_OP_UNARY_PLUS: |
1534 | case BYTECODE_OP_UNARY_MINUS: | |
3834b99f MD |
1535 | { |
1536 | /* Pop 1, push 1 */ | |
1537 | if (!vstack_ax(stack)) { | |
80c2a69a | 1538 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1539 | ret = -EINVAL; |
1540 | goto end; | |
1541 | } | |
1542 | switch (vstack_ax(stack)->type) { | |
1543 | case REG_S64: | |
1242217a | 1544 | case REG_U64: |
3834b99f MD |
1545 | case REG_TYPE_UNKNOWN: |
1546 | break; | |
1547 | default: | |
80c2a69a | 1548 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type %d for operation\n", |
3834b99f MD |
1549 | (int) vstack_ax(stack)->type); |
1550 | ret = -EINVAL; | |
1551 | goto end; | |
1552 | } | |
1553 | ||
1554 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; | |
1555 | next_pc += sizeof(struct unary_op); | |
1556 | break; | |
1557 | } | |
1558 | ||
80c2a69a FD |
1559 | case BYTECODE_OP_UNARY_PLUS_S64: |
1560 | case BYTECODE_OP_UNARY_MINUS_S64: | |
1561 | case BYTECODE_OP_UNARY_NOT_S64: | |
07dfc1d0 MD |
1562 | { |
1563 | /* Pop 1, push 1 */ | |
1564 | if (!vstack_ax(stack)) { | |
80c2a69a | 1565 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1566 | ret = -EINVAL; |
1567 | goto end; | |
1568 | } | |
1569 | switch (vstack_ax(stack)->type) { | |
1570 | case REG_S64: | |
1242217a | 1571 | case REG_U64: |
3834b99f MD |
1572 | break; |
1573 | default: | |
80c2a69a | 1574 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type %d for operation\n", |
3834b99f MD |
1575 | (int) vstack_ax(stack)->type); |
1576 | ret = -EINVAL; | |
1577 | goto end; | |
1578 | } | |
1579 | ||
3834b99f MD |
1580 | next_pc += sizeof(struct unary_op); |
1581 | break; | |
1582 | } | |
1583 | ||
80c2a69a | 1584 | case BYTECODE_OP_UNARY_NOT: |
3834b99f MD |
1585 | { |
1586 | /* Pop 1, push 1 */ | |
1587 | if (!vstack_ax(stack)) { | |
80c2a69a | 1588 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1589 | ret = -EINVAL; |
1590 | goto end; | |
1591 | } | |
1592 | switch (vstack_ax(stack)->type) { | |
1593 | case REG_S64: | |
1242217a | 1594 | case REG_U64: |
3834b99f MD |
1595 | case REG_TYPE_UNKNOWN: |
1596 | break; | |
1597 | default: | |
80c2a69a | 1598 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type %d for operation\n", |
e16c054b MD |
1599 | (int) vstack_ax(stack)->type); |
1600 | ret = -EINVAL; | |
1601 | goto end; | |
1602 | } | |
1603 | ||
e16c054b MD |
1604 | next_pc += sizeof(struct unary_op); |
1605 | break; | |
1606 | } | |
1607 | ||
80c2a69a | 1608 | case BYTECODE_OP_UNARY_BIT_NOT: |
e16c054b MD |
1609 | { |
1610 | /* Pop 1, push 1 */ | |
1611 | if (!vstack_ax(stack)) { | |
80c2a69a | 1612 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
e16c054b MD |
1613 | ret = -EINVAL; |
1614 | goto end; | |
1615 | } | |
1616 | switch (vstack_ax(stack)->type) { | |
1617 | case REG_S64: | |
1242217a | 1618 | case REG_U64: |
e16c054b MD |
1619 | case REG_TYPE_UNKNOWN: |
1620 | break; | |
1621 | case REG_DOUBLE: | |
1622 | default: | |
80c2a69a | 1623 | printk(KERN_WARNING "LTTng: bytecode: Unexpected register type %d for operation\n", |
3834b99f | 1624 | (int) vstack_ax(stack)->type); |
07dfc1d0 MD |
1625 | ret = -EINVAL; |
1626 | goto end; | |
1627 | } | |
3834b99f | 1628 | |
1242217a | 1629 | vstack_ax(stack)->type = REG_U64; |
07dfc1d0 MD |
1630 | next_pc += sizeof(struct unary_op); |
1631 | break; | |
1632 | } | |
1633 | ||
1634 | /* logical */ | |
80c2a69a FD |
1635 | case BYTECODE_OP_AND: |
1636 | case BYTECODE_OP_OR: | |
07dfc1d0 MD |
1637 | { |
1638 | struct logical_op *insn = (struct logical_op *) pc; | |
1639 | int merge_ret; | |
1640 | ||
1641 | /* Add merge point to table */ | |
1642 | merge_ret = merge_point_add_check(mp_table, | |
1643 | insn->skip_offset, stack); | |
1644 | if (merge_ret) { | |
1645 | ret = merge_ret; | |
1646 | goto end; | |
1647 | } | |
3834b99f MD |
1648 | |
1649 | if (!vstack_ax(stack)) { | |
80c2a69a | 1650 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1651 | ret = -EINVAL; |
1652 | goto end; | |
1653 | } | |
1654 | /* There is always a cast-to-s64 operation before a or/and op. */ | |
1655 | switch (vstack_ax(stack)->type) { | |
1656 | case REG_S64: | |
1242217a | 1657 | case REG_U64: |
3834b99f MD |
1658 | break; |
1659 | default: | |
80c2a69a | 1660 | printk(KERN_WARNING "LTTng: bytecode: Incorrect register type %d for operation\n", |
3834b99f MD |
1661 | (int) vstack_ax(stack)->type); |
1662 | ret = -EINVAL; | |
1663 | goto end; | |
1664 | } | |
1665 | ||
07dfc1d0 MD |
1666 | /* Continue to next instruction */ |
1667 | /* Pop 1 when jump not taken */ | |
1668 | if (vstack_pop(stack)) { | |
1669 | ret = -EINVAL; | |
1670 | goto end; | |
1671 | } | |
1672 | next_pc += sizeof(struct logical_op); | |
1673 | break; | |
1674 | } | |
1675 | ||
1676 | /* load field ref */ | |
80c2a69a | 1677 | case BYTECODE_OP_LOAD_FIELD_REF: |
07dfc1d0 | 1678 | { |
80c2a69a | 1679 | printk(KERN_WARNING "LTTng: bytecode: Unknown field ref type\n"); |
07dfc1d0 MD |
1680 | ret = -EINVAL; |
1681 | goto end; | |
1682 | } | |
1683 | /* get context ref */ | |
80c2a69a | 1684 | case BYTECODE_OP_GET_CONTEXT_REF: |
07dfc1d0 | 1685 | { |
80c2a69a | 1686 | printk(KERN_WARNING "LTTng: bytecode: Unknown get context ref type\n"); |
07dfc1d0 MD |
1687 | ret = -EINVAL; |
1688 | goto end; | |
1689 | } | |
80c2a69a FD |
1690 | case BYTECODE_OP_LOAD_FIELD_REF_STRING: |
1691 | case BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE: | |
1692 | case BYTECODE_OP_GET_CONTEXT_REF_STRING: | |
1693 | case BYTECODE_OP_LOAD_FIELD_REF_USER_STRING: | |
1694 | case BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE: | |
07dfc1d0 MD |
1695 | { |
1696 | if (vstack_push(stack)) { | |
1697 | ret = -EINVAL; | |
1698 | goto end; | |
1699 | } | |
1700 | vstack_ax(stack)->type = REG_STRING; | |
1701 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1702 | break; | |
1703 | } | |
80c2a69a FD |
1704 | case BYTECODE_OP_LOAD_FIELD_REF_S64: |
1705 | case BYTECODE_OP_GET_CONTEXT_REF_S64: | |
07dfc1d0 MD |
1706 | { |
1707 | if (vstack_push(stack)) { | |
1708 | ret = -EINVAL; | |
1709 | goto end; | |
1710 | } | |
1711 | vstack_ax(stack)->type = REG_S64; | |
1712 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1713 | break; | |
1714 | } | |
1715 | ||
1716 | /* load from immediate operand */ | |
80c2a69a | 1717 | case BYTECODE_OP_LOAD_STRING: |
07dfc1d0 MD |
1718 | { |
1719 | struct load_op *insn = (struct load_op *) pc; | |
1720 | ||
1721 | if (vstack_push(stack)) { | |
1722 | ret = -EINVAL; | |
1723 | goto end; | |
1724 | } | |
1725 | vstack_ax(stack)->type = REG_STRING; | |
1726 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
02aca193 PP |
1727 | break; |
1728 | } | |
1729 | ||
80c2a69a | 1730 | case BYTECODE_OP_LOAD_STAR_GLOB_STRING: |
02aca193 PP |
1731 | { |
1732 | struct load_op *insn = (struct load_op *) pc; | |
1733 | ||
1734 | if (vstack_push(stack)) { | |
1735 | ret = -EINVAL; | |
1736 | goto end; | |
1737 | } | |
1738 | vstack_ax(stack)->type = REG_STAR_GLOB_STRING; | |
1739 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
07dfc1d0 MD |
1740 | break; |
1741 | } | |
1742 | ||
80c2a69a | 1743 | case BYTECODE_OP_LOAD_S64: |
07dfc1d0 MD |
1744 | { |
1745 | if (vstack_push(stack)) { | |
1746 | ret = -EINVAL; | |
1747 | goto end; | |
1748 | } | |
1749 | vstack_ax(stack)->type = REG_S64; | |
1750 | next_pc += sizeof(struct load_op) | |
1751 | + sizeof(struct literal_numeric); | |
1752 | break; | |
1753 | } | |
1754 | ||
80c2a69a | 1755 | case BYTECODE_OP_CAST_TO_S64: |
07dfc1d0 MD |
1756 | { |
1757 | /* Pop 1, push 1 */ | |
1758 | if (!vstack_ax(stack)) { | |
80c2a69a | 1759 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n"); |
07dfc1d0 MD |
1760 | ret = -EINVAL; |
1761 | goto end; | |
1762 | } | |
3834b99f MD |
1763 | switch (vstack_ax(stack)->type) { |
1764 | case REG_S64: | |
1242217a | 1765 | case REG_U64: |
3834b99f MD |
1766 | case REG_DOUBLE: |
1767 | case REG_TYPE_UNKNOWN: | |
1768 | break; | |
1769 | default: | |
80c2a69a | 1770 | printk(KERN_WARNING "LTTng: bytecode: Incorrect register type %d for cast\n", |
3834b99f MD |
1771 | (int) vstack_ax(stack)->type); |
1772 | ret = -EINVAL; | |
1773 | goto end; | |
1774 | } | |
07dfc1d0 MD |
1775 | vstack_ax(stack)->type = REG_S64; |
1776 | next_pc += sizeof(struct cast_op); | |
1777 | break; | |
1778 | } | |
80c2a69a | 1779 | case BYTECODE_OP_CAST_NOP: |
07dfc1d0 MD |
1780 | { |
1781 | next_pc += sizeof(struct cast_op); | |
1782 | break; | |
1783 | } | |
1784 | ||
3834b99f MD |
1785 | /* |
1786 | * Instructions for recursive traversal through composed types. | |
1787 | */ | |
80c2a69a FD |
1788 | case BYTECODE_OP_GET_CONTEXT_ROOT: |
1789 | case BYTECODE_OP_GET_APP_CONTEXT_ROOT: | |
1790 | case BYTECODE_OP_GET_PAYLOAD_ROOT: | |
3834b99f MD |
1791 | { |
1792 | if (vstack_push(stack)) { | |
1793 | ret = -EINVAL; | |
1794 | goto end; | |
1795 | } | |
1796 | vstack_ax(stack)->type = REG_PTR; | |
1797 | next_pc += sizeof(struct load_op); | |
1798 | break; | |
1799 | } | |
1800 | ||
80c2a69a | 1801 | case BYTECODE_OP_LOAD_FIELD: |
3834b99f MD |
1802 | { |
1803 | /* Pop 1, push 1 */ | |
1804 | if (!vstack_ax(stack)) { | |
80c2a69a | 1805 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1806 | ret = -EINVAL; |
1807 | goto end; | |
1808 | } | |
1809 | if (vstack_ax(stack)->type != REG_PTR) { | |
80c2a69a | 1810 | printk(KERN_WARNING "LTTng: bytecode: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1811 | ret = -EINVAL; |
1812 | goto end; | |
1813 | } | |
1814 | vstack_ax(stack)->type = REG_TYPE_UNKNOWN; | |
1815 | next_pc += sizeof(struct load_op); | |
1816 | break; | |
1817 | } | |
1818 | ||
80c2a69a FD |
1819 | case BYTECODE_OP_LOAD_FIELD_S8: |
1820 | case BYTECODE_OP_LOAD_FIELD_S16: | |
1821 | case BYTECODE_OP_LOAD_FIELD_S32: | |
1822 | case BYTECODE_OP_LOAD_FIELD_S64: | |
1242217a FD |
1823 | { |
1824 | /* Pop 1, push 1 */ | |
1825 | if (!vstack_ax(stack)) { | |
1826 | printk(KERN_WARNING "Empty stack\n\n"); | |
1827 | ret = -EINVAL; | |
1828 | goto end; | |
1829 | } | |
1830 | if (vstack_ax(stack)->type != REG_PTR) { | |
1831 | printk(KERN_WARNING "Expecting pointer on top of stack\n\n"); | |
1832 | ret = -EINVAL; | |
1833 | goto end; | |
1834 | } | |
1835 | vstack_ax(stack)->type = REG_S64; | |
1836 | next_pc += sizeof(struct load_op); | |
1837 | break; | |
1838 | } | |
80c2a69a FD |
1839 | case BYTECODE_OP_LOAD_FIELD_U8: |
1840 | case BYTECODE_OP_LOAD_FIELD_U16: | |
1841 | case BYTECODE_OP_LOAD_FIELD_U32: | |
1842 | case BYTECODE_OP_LOAD_FIELD_U64: | |
3834b99f MD |
1843 | { |
1844 | /* Pop 1, push 1 */ | |
1845 | if (!vstack_ax(stack)) { | |
80c2a69a | 1846 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1847 | ret = -EINVAL; |
1848 | goto end; | |
1849 | } | |
1850 | if (vstack_ax(stack)->type != REG_PTR) { | |
80c2a69a | 1851 | printk(KERN_WARNING "LTTng: bytecode: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1852 | ret = -EINVAL; |
1853 | goto end; | |
1854 | } | |
1242217a | 1855 | vstack_ax(stack)->type = REG_U64; |
3834b99f MD |
1856 | next_pc += sizeof(struct load_op); |
1857 | break; | |
1858 | } | |
80c2a69a FD |
1859 | case BYTECODE_OP_LOAD_FIELD_STRING: |
1860 | case BYTECODE_OP_LOAD_FIELD_SEQUENCE: | |
3834b99f MD |
1861 | { |
1862 | /* Pop 1, push 1 */ | |
1863 | if (!vstack_ax(stack)) { | |
80c2a69a | 1864 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1865 | ret = -EINVAL; |
1866 | goto end; | |
1867 | } | |
1868 | if (vstack_ax(stack)->type != REG_PTR) { | |
80c2a69a | 1869 | printk(KERN_WARNING "LTTng: bytecode: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1870 | ret = -EINVAL; |
1871 | goto end; | |
1872 | } | |
1873 | vstack_ax(stack)->type = REG_STRING; | |
1874 | next_pc += sizeof(struct load_op); | |
1875 | break; | |
1876 | } | |
1877 | ||
80c2a69a | 1878 | case BYTECODE_OP_LOAD_FIELD_DOUBLE: |
3834b99f MD |
1879 | { |
1880 | /* Pop 1, push 1 */ | |
1881 | if (!vstack_ax(stack)) { | |
80c2a69a | 1882 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1883 | ret = -EINVAL; |
1884 | goto end; | |
1885 | } | |
1886 | if (vstack_ax(stack)->type != REG_PTR) { | |
80c2a69a | 1887 | printk(KERN_WARNING "LTTng: bytecode: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1888 | ret = -EINVAL; |
1889 | goto end; | |
1890 | } | |
1891 | vstack_ax(stack)->type = REG_DOUBLE; | |
1892 | next_pc += sizeof(struct load_op); | |
1893 | break; | |
1894 | } | |
1895 | ||
80c2a69a FD |
1896 | case BYTECODE_OP_GET_SYMBOL: |
1897 | case BYTECODE_OP_GET_SYMBOL_FIELD: | |
3834b99f MD |
1898 | { |
1899 | /* Pop 1, push 1 */ | |
1900 | if (!vstack_ax(stack)) { | |
80c2a69a | 1901 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1902 | ret = -EINVAL; |
1903 | goto end; | |
1904 | } | |
1905 | if (vstack_ax(stack)->type != REG_PTR) { | |
80c2a69a | 1906 | printk(KERN_WARNING "LTTng: bytecode: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1907 | ret = -EINVAL; |
1908 | goto end; | |
1909 | } | |
1910 | next_pc += sizeof(struct load_op) + sizeof(struct get_symbol); | |
1911 | break; | |
1912 | } | |
1913 | ||
80c2a69a | 1914 | case BYTECODE_OP_GET_INDEX_U16: |
3834b99f MD |
1915 | { |
1916 | /* Pop 1, push 1 */ | |
1917 | if (!vstack_ax(stack)) { | |
80c2a69a | 1918 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1919 | ret = -EINVAL; |
1920 | goto end; | |
1921 | } | |
1922 | if (vstack_ax(stack)->type != REG_PTR) { | |
80c2a69a | 1923 | printk(KERN_WARNING "LTTng: bytecode: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1924 | ret = -EINVAL; |
1925 | goto end; | |
1926 | } | |
1927 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u16); | |
1928 | break; | |
1929 | } | |
1930 | ||
80c2a69a | 1931 | case BYTECODE_OP_GET_INDEX_U64: |
3834b99f MD |
1932 | { |
1933 | /* Pop 1, push 1 */ | |
1934 | if (!vstack_ax(stack)) { | |
80c2a69a | 1935 | printk(KERN_WARNING "LTTng: bytecode: Empty stack\n\n"); |
3834b99f MD |
1936 | ret = -EINVAL; |
1937 | goto end; | |
1938 | } | |
1939 | if (vstack_ax(stack)->type != REG_PTR) { | |
80c2a69a | 1940 | printk(KERN_WARNING "LTTng: bytecode: Expecting pointer on top of stack\n\n"); |
3834b99f MD |
1941 | ret = -EINVAL; |
1942 | goto end; | |
1943 | } | |
1944 | next_pc += sizeof(struct load_op) + sizeof(struct get_index_u64); | |
1945 | break; | |
1946 | } | |
1947 | ||
07dfc1d0 MD |
1948 | } |
1949 | end: | |
1950 | *_next_pc = next_pc; | |
1951 | return ret; | |
1952 | } | |
1953 | ||
e2a52595 MD |
1954 | int lttng_bytecode_validate_load(struct bytecode_runtime *bytecode) |
1955 | { | |
1956 | char *pc, *next_pc, *start_pc; | |
1957 | int ret = -EINVAL; | |
1958 | ||
1959 | start_pc = &bytecode->code[0]; | |
1960 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; | |
1961 | pc = next_pc) { | |
1962 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); | |
1963 | if (ret != 0) { | |
1964 | if (ret == -ERANGE) | |
1965 | printk(KERN_WARNING "LTTng: bytecode: bytecode overflow\n"); | |
1966 | goto end; | |
1967 | } | |
1968 | dbg_printk("Validating loads: op %s (%u)\n", | |
1969 | lttng_bytecode_print_op((unsigned int) *(bytecode_opcode_t *) pc), | |
1970 | (unsigned int) *(bytecode_opcode_t *) pc); | |
1971 | ||
1972 | ret = validate_load(&next_pc, pc); | |
1973 | if (ret) | |
1974 | goto end; | |
1975 | } | |
1976 | end: | |
1977 | return ret; | |
1978 | } | |
1979 | ||
07dfc1d0 MD |
1980 | /* |
1981 | * Never called concurrently (hash seed is shared). | |
1982 | */ | |
80c2a69a | 1983 | int lttng_bytecode_validate(struct bytecode_runtime *bytecode) |
07dfc1d0 MD |
1984 | { |
1985 | struct mp_table *mp_table; | |
7962cb86 | 1986 | char *pc, *next_pc, *start_pc; |
07dfc1d0 MD |
1987 | int ret = -EINVAL; |
1988 | struct vstack stack; | |
1989 | ||
1990 | vstack_init(&stack); | |
1991 | ||
1992 | mp_table = kzalloc(sizeof(*mp_table), GFP_KERNEL); | |
1993 | if (!mp_table) { | |
80c2a69a | 1994 | printk(KERN_WARNING "LTTng: bytecode: Error allocating hash table for bytecode validation\n"); |
07dfc1d0 MD |
1995 | return -ENOMEM; |
1996 | } | |
3834b99f | 1997 | start_pc = &bytecode->code[0]; |
07dfc1d0 MD |
1998 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
1999 | pc = next_pc) { | |
2000 | ret = bytecode_validate_overflow(bytecode, start_pc, pc); | |
2001 | if (ret != 0) { | |
2002 | if (ret == -ERANGE) | |
80c2a69a | 2003 | printk(KERN_WARNING "LTTng: bytecode: bytecode overflow\n"); |
07dfc1d0 MD |
2004 | goto end; |
2005 | } | |
2006 | dbg_printk("Validating op %s (%u)\n", | |
80c2a69a FD |
2007 | lttng_bytecode_print_op((unsigned int) *(bytecode_opcode_t *) pc), |
2008 | (unsigned int) *(bytecode_opcode_t *) pc); | |
07dfc1d0 MD |
2009 | |
2010 | /* | |
2011 | * For each instruction, validate the current context | |
2012 | * (traversal of entire execution flow), and validate | |
3834b99f | 2013 | * all merge points targeting this instruction. |
07dfc1d0 MD |
2014 | */ |
2015 | ret = validate_instruction_all_contexts(bytecode, mp_table, | |
2016 | &stack, start_pc, pc); | |
2017 | if (ret) | |
2018 | goto end; | |
2019 | ret = exec_insn(bytecode, mp_table, &stack, &next_pc, pc); | |
2020 | if (ret <= 0) | |
2021 | goto end; | |
2022 | } | |
2023 | end: | |
2024 | if (delete_all_nodes(mp_table)) { | |
2025 | if (!ret) { | |
80c2a69a | 2026 | printk(KERN_WARNING "LTTng: bytecode: Unexpected merge points\n"); |
07dfc1d0 MD |
2027 | ret = -EINVAL; |
2028 | } | |
2029 | } | |
2030 | kfree(mp_table); | |
2031 | return ret; | |
2032 | } |