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Fix: only include linux/cpuhotplug.h for kernels >= 4.10
[lttng-modules.git] / lttng-syscalls.c
1 /*
2 * lttng-syscalls.c
3 *
4 * LTTng syscall probes.
5 *
6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/compat.h>
26 #include <linux/err.h>
27 #include <linux/bitmap.h>
28 #include <linux/in.h>
29 #include <linux/in6.h>
30 #include <linux/seq_file.h>
31 #include <linux/stringify.h>
32 #include <linux/file.h>
33 #include <linux/anon_inodes.h>
34 #include <asm/ptrace.h>
35 #include <asm/syscall.h>
36
37 #include <lib/bitfield.h>
38 #include <wrapper/tracepoint.h>
39 #include <wrapper/file.h>
40 #include <wrapper/rcu.h>
41 #include <lttng-events.h>
42
43 #ifndef CONFIG_COMPAT
44 # ifndef is_compat_task
45 # define is_compat_task() (0)
46 # endif
47 #endif
48
49 /* in_compat_syscall appears in kernel 4.6. */
50 #ifndef in_compat_syscall
51 #define in_compat_syscall() is_compat_task()
52 #endif
53
54 enum sc_type {
55 SC_TYPE_ENTRY,
56 SC_TYPE_EXIT,
57 SC_TYPE_COMPAT_ENTRY,
58 SC_TYPE_COMPAT_EXIT,
59 };
60
61 #define SYSCALL_ENTRY_TOK syscall_entry_
62 #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_
63 #define SYSCALL_EXIT_TOK syscall_exit_
64 #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_
65
66 #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK)
67 #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK)
68 #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK)
69 #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK)
70
71 static
72 void syscall_entry_probe(void *__data, struct pt_regs *regs, long id);
73 static
74 void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret);
75
76 /*
77 * Forward declarations for old kernels.
78 */
79 struct mmsghdr;
80 struct rlimit64;
81 struct oldold_utsname;
82 struct old_utsname;
83 struct sel_arg_struct;
84 struct mmap_arg_struct;
85 struct file_handle;
86 struct user_msghdr;
87
88 #ifdef IA32_NR_syscalls
89 #define NR_compat_syscalls IA32_NR_syscalls
90 #else
91 #define NR_compat_syscalls NR_syscalls
92 #endif
93
94 /*
95 * Create LTTng tracepoint probes.
96 */
97 #define LTTNG_PACKAGE_BUILD
98 #define CREATE_TRACE_POINTS
99 #define TP_MODULE_NOINIT
100 #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers
101
102 #define PARAMS(args...) args
103
104 /* Handle unknown syscalls */
105 #undef TRACE_SYSTEM
106 #define TRACE_SYSTEM syscalls_unknown
107 #include <instrumentation/syscalls/headers/syscalls_unknown.h>
108 #undef TRACE_SYSTEM
109
110 #define SC_ENTER
111
112 #undef sc_exit
113 #define sc_exit(...)
114 #undef sc_in
115 #define sc_in(...) __VA_ARGS__
116 #undef sc_out
117 #define sc_out(...)
118 #undef sc_inout
119 #define sc_inout(...) __VA_ARGS__
120
121 /* Hijack probe callback for system call enter */
122 #undef TP_PROBE_CB
123 #define TP_PROBE_CB(_template) &syscall_entry_probe
124 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
125 LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
126 PARAMS(_fields))
127 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
128 LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
129 PARAMS(_locvar), PARAMS(_code_pre), \
130 PARAMS(_fields), PARAMS(_code_post))
131 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
132 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields))
133 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
134 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name)
135 #undef TRACE_SYSTEM
136 #define TRACE_SYSTEM syscall_entry_integers
137 #define TRACE_INCLUDE_FILE syscalls_integers
138 #include <instrumentation/syscalls/headers/syscalls_integers.h>
139 #undef TRACE_INCLUDE_FILE
140 #undef TRACE_SYSTEM
141 #define TRACE_SYSTEM syscall_entry_pointers
142 #define TRACE_INCLUDE_FILE syscalls_pointers
143 #include <instrumentation/syscalls/headers/syscalls_pointers.h>
144 #undef TRACE_INCLUDE_FILE
145 #undef TRACE_SYSTEM
146 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
147 #undef SC_LTTNG_TRACEPOINT_EVENT
148 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
149 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
150 #undef TP_PROBE_CB
151 #undef _TRACE_SYSCALLS_INTEGERS_H
152 #undef _TRACE_SYSCALLS_POINTERS_H
153
154 /* Hijack probe callback for compat system call enter */
155 #define TP_PROBE_CB(_template) &syscall_entry_probe
156 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
157 LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
158 PARAMS(_fields))
159 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
160 LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
161 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
162 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
163 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields))
164 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
165 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \
166 compat_syscall_entry_##_name)
167 #define TRACE_SYSTEM compat_syscall_entry_integers
168 #define TRACE_INCLUDE_FILE compat_syscalls_integers
169 #include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
170 #undef TRACE_INCLUDE_FILE
171 #undef TRACE_SYSTEM
172 #define TRACE_SYSTEM compat_syscall_entry_pointers
173 #define TRACE_INCLUDE_FILE compat_syscalls_pointers
174 #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
175 #undef TRACE_INCLUDE_FILE
176 #undef TRACE_SYSTEM
177 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
178 #undef SC_LTTNG_TRACEPOINT_EVENT
179 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
180 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
181 #undef TP_PROBE_CB
182 #undef _TRACE_SYSCALLS_INTEGERS_H
183 #undef _TRACE_SYSCALLS_POINTERS_H
184
185 #undef SC_ENTER
186
187 #define SC_EXIT
188
189 #undef sc_exit
190 #define sc_exit(...) __VA_ARGS__
191 #undef sc_in
192 #define sc_in(...)
193 #undef sc_out
194 #define sc_out(...) __VA_ARGS__
195 #undef sc_inout
196 #define sc_inout(...) __VA_ARGS__
197
198 /* Hijack probe callback for system call exit */
199 #define TP_PROBE_CB(_template) &syscall_exit_probe
200 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
201 LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
202 PARAMS(_fields))
203 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
204 LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
205 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
206 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
207 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields))
208 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
209 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \
210 syscall_exit_##_name)
211 #define TRACE_SYSTEM syscall_exit_integers
212 #define TRACE_INCLUDE_FILE syscalls_integers
213 #include <instrumentation/syscalls/headers/syscalls_integers.h>
214 #undef TRACE_INCLUDE_FILE
215 #undef TRACE_SYSTEM
216 #define TRACE_SYSTEM syscall_exit_pointers
217 #define TRACE_INCLUDE_FILE syscalls_pointers
218 #include <instrumentation/syscalls/headers/syscalls_pointers.h>
219 #undef TRACE_INCLUDE_FILE
220 #undef TRACE_SYSTEM
221 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
222 #undef SC_LTTNG_TRACEPOINT_EVENT
223 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
224 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
225 #undef TP_PROBE_CB
226 #undef _TRACE_SYSCALLS_INTEGERS_H
227 #undef _TRACE_SYSCALLS_POINTERS_H
228
229
230 /* Hijack probe callback for compat system call exit */
231 #define TP_PROBE_CB(_template) &syscall_exit_probe
232 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
233 LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
234 PARAMS(_fields))
235 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
236 LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
237 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
238 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
239 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields))
240 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
241 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \
242 compat_syscall_exit_##_name)
243 #define TRACE_SYSTEM compat_syscall_exit_integers
244 #define TRACE_INCLUDE_FILE compat_syscalls_integers
245 #include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
246 #undef TRACE_INCLUDE_FILE
247 #undef TRACE_SYSTEM
248 #define TRACE_SYSTEM compat_syscall_exit_pointers
249 #define TRACE_INCLUDE_FILE compat_syscalls_pointers
250 #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
251 #undef TRACE_INCLUDE_FILE
252 #undef TRACE_SYSTEM
253 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
254 #undef SC_LTTNG_TRACEPOINT_EVENT
255 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
256 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
257 #undef TP_PROBE_CB
258 #undef _TRACE_SYSCALLS_INTEGERS_H
259 #undef _TRACE_SYSCALLS_POINTERS_H
260
261 #undef SC_EXIT
262
263 #undef TP_MODULE_NOINIT
264 #undef LTTNG_PACKAGE_BUILD
265 #undef CREATE_TRACE_POINTS
266
267 struct trace_syscall_entry {
268 void *func;
269 const struct lttng_event_desc *desc;
270 const struct lttng_event_field *fields;
271 unsigned int nrargs;
272 };
273
274 #define CREATE_SYSCALL_TABLE
275
276 #define SC_ENTER
277
278 #undef sc_exit
279 #define sc_exit(...)
280
281 #undef TRACE_SYSCALL_TABLE
282 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
283 [ _nr ] = { \
284 .func = __event_probe__syscall_entry_##_template, \
285 .nrargs = (_nrargs), \
286 .fields = __event_fields___syscall_entry_##_template, \
287 .desc = &__event_desc___syscall_entry_##_name, \
288 },
289
290 /* Syscall enter tracing table */
291 static const struct trace_syscall_entry sc_table[] = {
292 #include <instrumentation/syscalls/headers/syscalls_integers.h>
293 #include <instrumentation/syscalls/headers/syscalls_pointers.h>
294 };
295
296 #undef TRACE_SYSCALL_TABLE
297 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
298 [ _nr ] = { \
299 .func = __event_probe__compat_syscall_entry_##_template, \
300 .nrargs = (_nrargs), \
301 .fields = __event_fields___compat_syscall_entry_##_template, \
302 .desc = &__event_desc___compat_syscall_entry_##_name, \
303 },
304
305 /* Compat syscall enter table */
306 const struct trace_syscall_entry compat_sc_table[] = {
307 #include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
308 #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
309 };
310
311 #undef SC_ENTER
312
313 #define SC_EXIT
314
315 #undef sc_exit
316 #define sc_exit(...) __VA_ARGS__
317
318 #undef TRACE_SYSCALL_TABLE
319 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
320 [ _nr ] = { \
321 .func = __event_probe__syscall_exit_##_template, \
322 .nrargs = (_nrargs), \
323 .fields = __event_fields___syscall_exit_##_template, \
324 .desc = &__event_desc___syscall_exit_##_name, \
325 },
326
327 /* Syscall exit table */
328 static const struct trace_syscall_entry sc_exit_table[] = {
329 #include <instrumentation/syscalls/headers/syscalls_integers.h>
330 #include <instrumentation/syscalls/headers/syscalls_pointers.h>
331 };
332
333 #undef TRACE_SYSCALL_TABLE
334 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
335 [ _nr ] = { \
336 .func = __event_probe__compat_syscall_exit_##_template, \
337 .nrargs = (_nrargs), \
338 .fields = __event_fields___compat_syscall_exit_##_template, \
339 .desc = &__event_desc___compat_syscall_exit_##_name, \
340 },
341
342 /* Compat syscall exit table */
343 const struct trace_syscall_entry compat_sc_exit_table[] = {
344 #include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
345 #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
346 };
347
348 #undef SC_EXIT
349
350 #undef CREATE_SYSCALL_TABLE
351
352 struct lttng_syscall_filter {
353 DECLARE_BITMAP(sc, NR_syscalls);
354 DECLARE_BITMAP(sc_compat, NR_compat_syscalls);
355 };
356
357 static void syscall_entry_unknown(struct lttng_event *event,
358 struct pt_regs *regs, unsigned int id)
359 {
360 unsigned long args[UNKNOWN_SYSCALL_NRARGS];
361
362 syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args);
363 if (unlikely(in_compat_syscall()))
364 __event_probe__compat_syscall_entry_unknown(event, id, args);
365 else
366 __event_probe__syscall_entry_unknown(event, id, args);
367 }
368
369 void syscall_entry_probe(void *__data, struct pt_regs *regs, long id)
370 {
371 struct lttng_channel *chan = __data;
372 struct lttng_event *event, *unknown_event;
373 const struct trace_syscall_entry *table, *entry;
374 size_t table_len;
375
376 if (unlikely(in_compat_syscall())) {
377 struct lttng_syscall_filter *filter;
378
379 filter = lttng_rcu_dereference(chan->sc_filter);
380 if (filter) {
381 if (id < 0 || id >= NR_compat_syscalls
382 || !test_bit(id, filter->sc_compat)) {
383 /* System call filtered out. */
384 return;
385 }
386 }
387 table = compat_sc_table;
388 table_len = ARRAY_SIZE(compat_sc_table);
389 unknown_event = chan->sc_compat_unknown;
390 } else {
391 struct lttng_syscall_filter *filter;
392
393 filter = lttng_rcu_dereference(chan->sc_filter);
394 if (filter) {
395 if (id < 0 || id >= NR_syscalls
396 || !test_bit(id, filter->sc)) {
397 /* System call filtered out. */
398 return;
399 }
400 }
401 table = sc_table;
402 table_len = ARRAY_SIZE(sc_table);
403 unknown_event = chan->sc_unknown;
404 }
405 if (unlikely(id < 0 || id >= table_len)) {
406 syscall_entry_unknown(unknown_event, regs, id);
407 return;
408 }
409 if (unlikely(in_compat_syscall()))
410 event = chan->compat_sc_table[id];
411 else
412 event = chan->sc_table[id];
413 if (unlikely(!event)) {
414 syscall_entry_unknown(unknown_event, regs, id);
415 return;
416 }
417 entry = &table[id];
418 WARN_ON_ONCE(!entry);
419
420 switch (entry->nrargs) {
421 case 0:
422 {
423 void (*fptr)(void *__data) = entry->func;
424
425 fptr(event);
426 break;
427 }
428 case 1:
429 {
430 void (*fptr)(void *__data, unsigned long arg0) = entry->func;
431 unsigned long args[1];
432
433 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
434 fptr(event, args[0]);
435 break;
436 }
437 case 2:
438 {
439 void (*fptr)(void *__data,
440 unsigned long arg0,
441 unsigned long arg1) = entry->func;
442 unsigned long args[2];
443
444 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
445 fptr(event, args[0], args[1]);
446 break;
447 }
448 case 3:
449 {
450 void (*fptr)(void *__data,
451 unsigned long arg0,
452 unsigned long arg1,
453 unsigned long arg2) = entry->func;
454 unsigned long args[3];
455
456 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
457 fptr(event, args[0], args[1], args[2]);
458 break;
459 }
460 case 4:
461 {
462 void (*fptr)(void *__data,
463 unsigned long arg0,
464 unsigned long arg1,
465 unsigned long arg2,
466 unsigned long arg3) = entry->func;
467 unsigned long args[4];
468
469 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
470 fptr(event, args[0], args[1], args[2], args[3]);
471 break;
472 }
473 case 5:
474 {
475 void (*fptr)(void *__data,
476 unsigned long arg0,
477 unsigned long arg1,
478 unsigned long arg2,
479 unsigned long arg3,
480 unsigned long arg4) = entry->func;
481 unsigned long args[5];
482
483 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
484 fptr(event, args[0], args[1], args[2], args[3], args[4]);
485 break;
486 }
487 case 6:
488 {
489 void (*fptr)(void *__data,
490 unsigned long arg0,
491 unsigned long arg1,
492 unsigned long arg2,
493 unsigned long arg3,
494 unsigned long arg4,
495 unsigned long arg5) = entry->func;
496 unsigned long args[6];
497
498 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
499 fptr(event, args[0], args[1], args[2],
500 args[3], args[4], args[5]);
501 break;
502 }
503 default:
504 break;
505 }
506 }
507
508 static void syscall_exit_unknown(struct lttng_event *event,
509 struct pt_regs *regs, int id, long ret)
510 {
511 unsigned long args[UNKNOWN_SYSCALL_NRARGS];
512
513 syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args);
514 if (unlikely(in_compat_syscall()))
515 __event_probe__compat_syscall_exit_unknown(event, id, ret,
516 args);
517 else
518 __event_probe__syscall_exit_unknown(event, id, ret, args);
519 }
520
521 void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
522 {
523 struct lttng_channel *chan = __data;
524 struct lttng_event *event, *unknown_event;
525 const struct trace_syscall_entry *table, *entry;
526 size_t table_len;
527 long id;
528
529 id = syscall_get_nr(current, regs);
530 if (unlikely(in_compat_syscall())) {
531 struct lttng_syscall_filter *filter;
532
533 filter = lttng_rcu_dereference(chan->sc_filter);
534 if (filter) {
535 if (id < 0 || id >= NR_compat_syscalls
536 || !test_bit(id, filter->sc_compat)) {
537 /* System call filtered out. */
538 return;
539 }
540 }
541 table = compat_sc_exit_table;
542 table_len = ARRAY_SIZE(compat_sc_exit_table);
543 unknown_event = chan->compat_sc_exit_unknown;
544 } else {
545 struct lttng_syscall_filter *filter;
546
547 filter = lttng_rcu_dereference(chan->sc_filter);
548 if (filter) {
549 if (id < 0 || id >= NR_syscalls
550 || !test_bit(id, filter->sc)) {
551 /* System call filtered out. */
552 return;
553 }
554 }
555 table = sc_exit_table;
556 table_len = ARRAY_SIZE(sc_exit_table);
557 unknown_event = chan->sc_exit_unknown;
558 }
559 if (unlikely(id < 0 || id >= table_len)) {
560 syscall_exit_unknown(unknown_event, regs, id, ret);
561 return;
562 }
563 if (unlikely(in_compat_syscall()))
564 event = chan->compat_sc_exit_table[id];
565 else
566 event = chan->sc_exit_table[id];
567 if (unlikely(!event)) {
568 syscall_exit_unknown(unknown_event, regs, id, ret);
569 return;
570 }
571 entry = &table[id];
572 WARN_ON_ONCE(!entry);
573
574 switch (entry->nrargs) {
575 case 0:
576 {
577 void (*fptr)(void *__data, long ret) = entry->func;
578
579 fptr(event, ret);
580 break;
581 }
582 case 1:
583 {
584 void (*fptr)(void *__data,
585 long ret,
586 unsigned long arg0) = entry->func;
587 unsigned long args[1];
588
589 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
590 fptr(event, ret, args[0]);
591 break;
592 }
593 case 2:
594 {
595 void (*fptr)(void *__data,
596 long ret,
597 unsigned long arg0,
598 unsigned long arg1) = entry->func;
599 unsigned long args[2];
600
601 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
602 fptr(event, ret, args[0], args[1]);
603 break;
604 }
605 case 3:
606 {
607 void (*fptr)(void *__data,
608 long ret,
609 unsigned long arg0,
610 unsigned long arg1,
611 unsigned long arg2) = entry->func;
612 unsigned long args[3];
613
614 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
615 fptr(event, ret, args[0], args[1], args[2]);
616 break;
617 }
618 case 4:
619 {
620 void (*fptr)(void *__data,
621 long ret,
622 unsigned long arg0,
623 unsigned long arg1,
624 unsigned long arg2,
625 unsigned long arg3) = entry->func;
626 unsigned long args[4];
627
628 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
629 fptr(event, ret, args[0], args[1], args[2], args[3]);
630 break;
631 }
632 case 5:
633 {
634 void (*fptr)(void *__data,
635 long ret,
636 unsigned long arg0,
637 unsigned long arg1,
638 unsigned long arg2,
639 unsigned long arg3,
640 unsigned long arg4) = entry->func;
641 unsigned long args[5];
642
643 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
644 fptr(event, ret, args[0], args[1], args[2], args[3], args[4]);
645 break;
646 }
647 case 6:
648 {
649 void (*fptr)(void *__data,
650 long ret,
651 unsigned long arg0,
652 unsigned long arg1,
653 unsigned long arg2,
654 unsigned long arg3,
655 unsigned long arg4,
656 unsigned long arg5) = entry->func;
657 unsigned long args[6];
658
659 syscall_get_arguments(current, regs, 0, entry->nrargs, args);
660 fptr(event, ret, args[0], args[1], args[2],
661 args[3], args[4], args[5]);
662 break;
663 }
664 default:
665 break;
666 }
667 }
668
669 /*
670 * noinline to diminish caller stack size.
671 * Should be called with sessions lock held.
672 */
673 static
674 int fill_table(const struct trace_syscall_entry *table, size_t table_len,
675 struct lttng_event **chan_table, struct lttng_channel *chan,
676 void *filter, enum sc_type type)
677 {
678 const struct lttng_event_desc *desc;
679 unsigned int i;
680
681 /* Allocate events for each syscall, insert into table */
682 for (i = 0; i < table_len; i++) {
683 struct lttng_kernel_event ev;
684 desc = table[i].desc;
685
686 if (!desc) {
687 /* Unknown syscall */
688 continue;
689 }
690 /*
691 * Skip those already populated by previous failed
692 * register for this channel.
693 */
694 if (chan_table[i])
695 continue;
696 memset(&ev, 0, sizeof(ev));
697 switch (type) {
698 case SC_TYPE_ENTRY:
699 strncpy(ev.name, SYSCALL_ENTRY_STR,
700 LTTNG_KERNEL_SYM_NAME_LEN);
701 break;
702 case SC_TYPE_EXIT:
703 strncpy(ev.name, SYSCALL_EXIT_STR,
704 LTTNG_KERNEL_SYM_NAME_LEN);
705 break;
706 case SC_TYPE_COMPAT_ENTRY:
707 strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR,
708 LTTNG_KERNEL_SYM_NAME_LEN);
709 break;
710 case SC_TYPE_COMPAT_EXIT:
711 strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR,
712 LTTNG_KERNEL_SYM_NAME_LEN);
713 break;
714 default:
715 BUG_ON(1);
716 break;
717 }
718 strncat(ev.name, desc->name,
719 LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1);
720 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
721 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
722 chan_table[i] = _lttng_event_create(chan, &ev, filter,
723 desc, ev.instrumentation);
724 WARN_ON_ONCE(!chan_table[i]);
725 if (IS_ERR(chan_table[i])) {
726 /*
727 * If something goes wrong in event registration
728 * after the first one, we have no choice but to
729 * leave the previous events in there, until
730 * deleted by session teardown.
731 */
732 return PTR_ERR(chan_table[i]);
733 }
734 }
735 return 0;
736 }
737
738 /*
739 * Should be called with sessions lock held.
740 */
741 int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
742 {
743 struct lttng_kernel_event ev;
744 int ret;
745
746 wrapper_vmalloc_sync_all();
747
748 if (!chan->sc_table) {
749 /* create syscall table mapping syscall to events */
750 chan->sc_table = kzalloc(sizeof(struct lttng_event *)
751 * ARRAY_SIZE(sc_table), GFP_KERNEL);
752 if (!chan->sc_table)
753 return -ENOMEM;
754 }
755 if (!chan->sc_exit_table) {
756 /* create syscall table mapping syscall to events */
757 chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *)
758 * ARRAY_SIZE(sc_exit_table), GFP_KERNEL);
759 if (!chan->sc_exit_table)
760 return -ENOMEM;
761 }
762
763
764 #ifdef CONFIG_COMPAT
765 if (!chan->compat_sc_table) {
766 /* create syscall table mapping compat syscall to events */
767 chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *)
768 * ARRAY_SIZE(compat_sc_table), GFP_KERNEL);
769 if (!chan->compat_sc_table)
770 return -ENOMEM;
771 }
772
773 if (!chan->compat_sc_exit_table) {
774 /* create syscall table mapping compat syscall to events */
775 chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *)
776 * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL);
777 if (!chan->compat_sc_exit_table)
778 return -ENOMEM;
779 }
780 #endif
781 if (!chan->sc_unknown) {
782 const struct lttng_event_desc *desc =
783 &__event_desc___syscall_entry_unknown;
784
785 memset(&ev, 0, sizeof(ev));
786 strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
787 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
788 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
789 chan->sc_unknown = _lttng_event_create(chan, &ev, filter,
790 desc,
791 ev.instrumentation);
792 WARN_ON_ONCE(!chan->sc_unknown);
793 if (IS_ERR(chan->sc_unknown)) {
794 return PTR_ERR(chan->sc_unknown);
795 }
796 }
797
798 if (!chan->sc_compat_unknown) {
799 const struct lttng_event_desc *desc =
800 &__event_desc___compat_syscall_entry_unknown;
801
802 memset(&ev, 0, sizeof(ev));
803 strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
804 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
805 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
806 chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter,
807 desc,
808 ev.instrumentation);
809 WARN_ON_ONCE(!chan->sc_unknown);
810 if (IS_ERR(chan->sc_compat_unknown)) {
811 return PTR_ERR(chan->sc_compat_unknown);
812 }
813 }
814
815 if (!chan->compat_sc_exit_unknown) {
816 const struct lttng_event_desc *desc =
817 &__event_desc___compat_syscall_exit_unknown;
818
819 memset(&ev, 0, sizeof(ev));
820 strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
821 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
822 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
823 chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev,
824 filter, desc,
825 ev.instrumentation);
826 WARN_ON_ONCE(!chan->compat_sc_exit_unknown);
827 if (IS_ERR(chan->compat_sc_exit_unknown)) {
828 return PTR_ERR(chan->compat_sc_exit_unknown);
829 }
830 }
831
832 if (!chan->sc_exit_unknown) {
833 const struct lttng_event_desc *desc =
834 &__event_desc___syscall_exit_unknown;
835
836 memset(&ev, 0, sizeof(ev));
837 strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
838 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
839 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
840 chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter,
841 desc, ev.instrumentation);
842 WARN_ON_ONCE(!chan->sc_exit_unknown);
843 if (IS_ERR(chan->sc_exit_unknown)) {
844 return PTR_ERR(chan->sc_exit_unknown);
845 }
846 }
847
848 ret = fill_table(sc_table, ARRAY_SIZE(sc_table),
849 chan->sc_table, chan, filter, SC_TYPE_ENTRY);
850 if (ret)
851 return ret;
852 ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table),
853 chan->sc_exit_table, chan, filter, SC_TYPE_EXIT);
854 if (ret)
855 return ret;
856
857 #ifdef CONFIG_COMPAT
858 ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table),
859 chan->compat_sc_table, chan, filter,
860 SC_TYPE_COMPAT_ENTRY);
861 if (ret)
862 return ret;
863 ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table),
864 chan->compat_sc_exit_table, chan, filter,
865 SC_TYPE_COMPAT_EXIT);
866 if (ret)
867 return ret;
868 #endif
869 if (!chan->sys_enter_registered) {
870 ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
871 (void *) syscall_entry_probe, chan);
872 if (ret)
873 return ret;
874 chan->sys_enter_registered = 1;
875 }
876 /*
877 * We change the name of sys_exit tracepoint due to namespace
878 * conflict with sys_exit syscall entry.
879 */
880 if (!chan->sys_exit_registered) {
881 ret = lttng_wrapper_tracepoint_probe_register("sys_exit",
882 (void *) syscall_exit_probe, chan);
883 if (ret) {
884 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
885 (void *) syscall_entry_probe, chan));
886 return ret;
887 }
888 chan->sys_exit_registered = 1;
889 }
890 return ret;
891 }
892
893 /*
894 * Only called at session destruction.
895 */
896 int lttng_syscalls_unregister(struct lttng_channel *chan)
897 {
898 int ret;
899
900 if (!chan->sc_table)
901 return 0;
902 if (chan->sys_enter_registered) {
903 ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit",
904 (void *) syscall_exit_probe, chan);
905 if (ret)
906 return ret;
907 chan->sys_enter_registered = 0;
908 }
909 if (chan->sys_exit_registered) {
910 ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter",
911 (void *) syscall_entry_probe, chan);
912 if (ret)
913 return ret;
914 chan->sys_exit_registered = 0;
915 }
916 /* lttng_event destroy will be performed by lttng_session_destroy() */
917 kfree(chan->sc_table);
918 kfree(chan->sc_exit_table);
919 #ifdef CONFIG_COMPAT
920 kfree(chan->compat_sc_table);
921 kfree(chan->compat_sc_exit_table);
922 #endif
923 kfree(chan->sc_filter);
924 return 0;
925 }
926
927 static
928 int get_syscall_nr(const char *syscall_name)
929 {
930 int syscall_nr = -1;
931 int i;
932
933 for (i = 0; i < ARRAY_SIZE(sc_table); i++) {
934 const struct trace_syscall_entry *entry;
935 const char *it_name;
936
937 entry = &sc_table[i];
938 if (!entry->desc)
939 continue;
940 it_name = entry->desc->name;
941 it_name += strlen(SYSCALL_ENTRY_STR);
942 if (!strcmp(syscall_name, it_name)) {
943 syscall_nr = i;
944 break;
945 }
946 }
947 return syscall_nr;
948 }
949
950 static
951 int get_compat_syscall_nr(const char *syscall_name)
952 {
953 int syscall_nr = -1;
954 int i;
955
956 for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) {
957 const struct trace_syscall_entry *entry;
958 const char *it_name;
959
960 entry = &compat_sc_table[i];
961 if (!entry->desc)
962 continue;
963 it_name = entry->desc->name;
964 it_name += strlen(COMPAT_SYSCALL_ENTRY_STR);
965 if (!strcmp(syscall_name, it_name)) {
966 syscall_nr = i;
967 break;
968 }
969 }
970 return syscall_nr;
971 }
972
973 static
974 uint32_t get_sc_tables_len(void)
975 {
976 return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table);
977 }
978
979 int lttng_syscall_filter_enable(struct lttng_channel *chan,
980 const char *name)
981 {
982 int syscall_nr, compat_syscall_nr, ret;
983 struct lttng_syscall_filter *filter;
984
985 WARN_ON_ONCE(!chan->sc_table);
986
987 if (!name) {
988 /* Enable all system calls by removing filter */
989 if (chan->sc_filter) {
990 filter = chan->sc_filter;
991 rcu_assign_pointer(chan->sc_filter, NULL);
992 synchronize_trace();
993 kfree(filter);
994 }
995 chan->syscall_all = 1;
996 return 0;
997 }
998
999 if (!chan->sc_filter) {
1000 if (chan->syscall_all) {
1001 /*
1002 * All syscalls are already enabled.
1003 */
1004 return -EEXIST;
1005 }
1006 filter = kzalloc(sizeof(struct lttng_syscall_filter),
1007 GFP_KERNEL);
1008 if (!filter)
1009 return -ENOMEM;
1010 } else {
1011 filter = chan->sc_filter;
1012 }
1013 syscall_nr = get_syscall_nr(name);
1014 compat_syscall_nr = get_compat_syscall_nr(name);
1015 if (syscall_nr < 0 && compat_syscall_nr < 0) {
1016 ret = -ENOENT;
1017 goto error;
1018 }
1019 if (syscall_nr >= 0) {
1020 if (test_bit(syscall_nr, filter->sc)) {
1021 ret = -EEXIST;
1022 goto error;
1023 }
1024 bitmap_set(filter->sc, syscall_nr, 1);
1025 }
1026 if (compat_syscall_nr >= 0) {
1027 if (test_bit(compat_syscall_nr, filter->sc_compat)) {
1028 ret = -EEXIST;
1029 goto error;
1030 }
1031 bitmap_set(filter->sc_compat, compat_syscall_nr, 1);
1032 }
1033 if (!chan->sc_filter)
1034 rcu_assign_pointer(chan->sc_filter, filter);
1035 return 0;
1036
1037 error:
1038 if (!chan->sc_filter)
1039 kfree(filter);
1040 return ret;
1041 }
1042
1043 int lttng_syscall_filter_disable(struct lttng_channel *chan,
1044 const char *name)
1045 {
1046 int syscall_nr, compat_syscall_nr, ret;
1047 struct lttng_syscall_filter *filter;
1048
1049 WARN_ON_ONCE(!chan->sc_table);
1050
1051 if (!chan->sc_filter) {
1052 if (!chan->syscall_all)
1053 return -EEXIST;
1054 filter = kzalloc(sizeof(struct lttng_syscall_filter),
1055 GFP_KERNEL);
1056 if (!filter)
1057 return -ENOMEM;
1058 /* Trace all system calls, then apply disable. */
1059 bitmap_set(filter->sc, 0, NR_syscalls);
1060 bitmap_set(filter->sc_compat, 0, NR_compat_syscalls);
1061 } else {
1062 filter = chan->sc_filter;
1063 }
1064
1065 if (!name) {
1066 /* Fail if all syscalls are already disabled. */
1067 if (bitmap_empty(filter->sc, NR_syscalls)
1068 && bitmap_empty(filter->sc_compat,
1069 NR_compat_syscalls)) {
1070 ret = -EEXIST;
1071 goto error;
1072 }
1073
1074 /* Disable all system calls */
1075 bitmap_clear(filter->sc, 0, NR_syscalls);
1076 bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);
1077 goto apply_filter;
1078 }
1079 syscall_nr = get_syscall_nr(name);
1080 compat_syscall_nr = get_compat_syscall_nr(name);
1081 if (syscall_nr < 0 && compat_syscall_nr < 0) {
1082 ret = -ENOENT;
1083 goto error;
1084 }
1085 if (syscall_nr >= 0) {
1086 if (!test_bit(syscall_nr, filter->sc)) {
1087 ret = -EEXIST;
1088 goto error;
1089 }
1090 bitmap_clear(filter->sc, syscall_nr, 1);
1091 }
1092 if (compat_syscall_nr >= 0) {
1093 if (!test_bit(compat_syscall_nr, filter->sc_compat)) {
1094 ret = -EEXIST;
1095 goto error;
1096 }
1097 bitmap_clear(filter->sc_compat, compat_syscall_nr, 1);
1098 }
1099 apply_filter:
1100 if (!chan->sc_filter)
1101 rcu_assign_pointer(chan->sc_filter, filter);
1102 chan->syscall_all = 0;
1103 return 0;
1104
1105 error:
1106 if (!chan->sc_filter)
1107 kfree(filter);
1108 return ret;
1109 }
1110
1111 static
1112 const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos)
1113 {
1114 const struct trace_syscall_entry *entry;
1115 int iter = 0;
1116
1117 for (entry = sc_table;
1118 entry < sc_table + ARRAY_SIZE(sc_table);
1119 entry++) {
1120 if (iter++ >= *pos)
1121 return entry;
1122 }
1123 for (entry = compat_sc_table;
1124 entry < compat_sc_table + ARRAY_SIZE(compat_sc_table);
1125 entry++) {
1126 if (iter++ >= *pos)
1127 return entry;
1128 }
1129 /* End of list */
1130 return NULL;
1131 }
1132
1133 static
1134 void *syscall_list_start(struct seq_file *m, loff_t *pos)
1135 {
1136 return (void *) syscall_list_get_entry(pos);
1137 }
1138
1139 static
1140 void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos)
1141 {
1142 (*ppos)++;
1143 return (void *) syscall_list_get_entry(ppos);
1144 }
1145
1146 static
1147 void syscall_list_stop(struct seq_file *m, void *p)
1148 {
1149 }
1150
1151 static
1152 int get_sc_table(const struct trace_syscall_entry *entry,
1153 const struct trace_syscall_entry **table,
1154 unsigned int *bitness)
1155 {
1156 if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) {
1157 if (bitness)
1158 *bitness = BITS_PER_LONG;
1159 if (table)
1160 *table = sc_table;
1161 return 0;
1162 }
1163 if (!(entry >= compat_sc_table
1164 && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) {
1165 return -EINVAL;
1166 }
1167 if (bitness)
1168 *bitness = 32;
1169 if (table)
1170 *table = compat_sc_table;
1171 return 0;
1172 }
1173
1174 static
1175 int syscall_list_show(struct seq_file *m, void *p)
1176 {
1177 const struct trace_syscall_entry *table, *entry = p;
1178 unsigned int bitness;
1179 unsigned long index;
1180 int ret;
1181 const char *name;
1182
1183 ret = get_sc_table(entry, &table, &bitness);
1184 if (ret)
1185 return ret;
1186 if (!entry->desc)
1187 return 0;
1188 if (table == sc_table) {
1189 index = entry - table;
1190 name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)];
1191 } else {
1192 index = (entry - table) + ARRAY_SIZE(sc_table);
1193 name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)];
1194 }
1195 seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n",
1196 index, name, bitness);
1197 return 0;
1198 }
1199
1200 static
1201 const struct seq_operations lttng_syscall_list_seq_ops = {
1202 .start = syscall_list_start,
1203 .next = syscall_list_next,
1204 .stop = syscall_list_stop,
1205 .show = syscall_list_show,
1206 };
1207
1208 static
1209 int lttng_syscall_list_open(struct inode *inode, struct file *file)
1210 {
1211 return seq_open(file, &lttng_syscall_list_seq_ops);
1212 }
1213
1214 const struct file_operations lttng_syscall_list_fops = {
1215 .owner = THIS_MODULE,
1216 .open = lttng_syscall_list_open,
1217 .read = seq_read,
1218 .llseek = seq_lseek,
1219 .release = seq_release,
1220 };
1221
1222 long lttng_channel_syscall_mask(struct lttng_channel *channel,
1223 struct lttng_kernel_syscall_mask __user *usyscall_mask)
1224 {
1225 uint32_t len, sc_tables_len, bitmask_len;
1226 int ret = 0, bit;
1227 char *tmp_mask;
1228 struct lttng_syscall_filter *filter;
1229
1230 ret = get_user(len, &usyscall_mask->len);
1231 if (ret)
1232 return ret;
1233 sc_tables_len = get_sc_tables_len();
1234 bitmask_len = ALIGN(sc_tables_len, 8) >> 3;
1235 if (len < sc_tables_len) {
1236 return put_user(sc_tables_len, &usyscall_mask->len);
1237 }
1238 /* Array is large enough, we can copy array to user-space. */
1239 tmp_mask = kzalloc(bitmask_len, GFP_KERNEL);
1240 if (!tmp_mask)
1241 return -ENOMEM;
1242 filter = channel->sc_filter;
1243
1244 for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) {
1245 bool state;
1246
1247 if (channel->sc_table) {
1248 if (filter)
1249 state = test_bit(bit, filter->sc);
1250 else
1251 state = 1;
1252 } else {
1253 state = 0;
1254 }
1255 bt_bitfield_write_be(tmp_mask, char, bit, 1, state);
1256 }
1257 for (; bit < sc_tables_len; bit++) {
1258 bool state;
1259
1260 if (channel->compat_sc_table) {
1261 if (filter)
1262 state = test_bit(bit - ARRAY_SIZE(sc_table),
1263 filter->sc_compat);
1264 else
1265 state = 1;
1266 } else {
1267 state = 0;
1268 }
1269 bt_bitfield_write_be(tmp_mask, char, bit, 1, state);
1270 }
1271 if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len))
1272 ret = -EFAULT;
1273 kfree(tmp_mask);
1274 return ret;
1275 }
1276
1277 int lttng_abi_syscall_list(void)
1278 {
1279 struct file *syscall_list_file;
1280 int file_fd, ret;
1281
1282 file_fd = lttng_get_unused_fd();
1283 if (file_fd < 0) {
1284 ret = file_fd;
1285 goto fd_error;
1286 }
1287
1288 syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
1289 &lttng_syscall_list_fops,
1290 NULL, O_RDWR);
1291 if (IS_ERR(syscall_list_file)) {
1292 ret = PTR_ERR(syscall_list_file);
1293 goto file_error;
1294 }
1295 ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
1296 if (ret < 0)
1297 goto open_error;
1298 fd_install(file_fd, syscall_list_file);
1299 return file_fd;
1300
1301 open_error:
1302 fput(syscall_list_file);
1303 file_error:
1304 put_unused_fd(file_fd);
1305 fd_error:
1306 return ret;
1307 }
LTTng 2.0/0.x modules
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