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fix: 'struct timex' removed upstream (v5.6)
[lttng-modules.git] / lttng-syscalls.c
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1/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
2 *
3 * lttng-syscalls.c
4 *
5 * LTTng syscall probes.
6 *
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 */
9
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/compat.h>
13#include <linux/err.h>
14#include <linux/bitmap.h>
15#include <linux/in.h>
16#include <linux/in6.h>
17#include <linux/seq_file.h>
18#include <linux/stringify.h>
19#include <linux/file.h>
20#include <linux/anon_inodes.h>
21#include <asm/ptrace.h>
22#include <asm/syscall.h>
23
24#include <lib/bitfield.h>
25#include <wrapper/tracepoint.h>
26#include <wrapper/file.h>
27#include <wrapper/rcu.h>
28#include <wrapper/syscall.h>
29#include <lttng-events.h>
30
31#ifndef CONFIG_COMPAT
32# ifndef is_compat_task
33# define is_compat_task() (0)
34# endif
35#endif
36
37/* in_compat_syscall appears in kernel 4.6. */
38#ifndef in_compat_syscall
39 #define in_compat_syscall() is_compat_task()
40#endif
41
42enum sc_type {
43 SC_TYPE_ENTRY,
44 SC_TYPE_EXIT,
45 SC_TYPE_COMPAT_ENTRY,
46 SC_TYPE_COMPAT_EXIT,
47};
48
49#define SYSCALL_ENTRY_TOK syscall_entry_
50#define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_
51#define SYSCALL_EXIT_TOK syscall_exit_
52#define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_
53
54#define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK)
55#define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK)
56#define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK)
57#define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK)
58
59static
60void syscall_entry_probe(void *__data, struct pt_regs *regs, long id);
61static
62void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret);
63
64/*
65 * Forward declarations for old kernels.
66 */
67struct mmsghdr;
68struct rlimit64;
69struct oldold_utsname;
70struct old_utsname;
71struct sel_arg_struct;
72struct mmap_arg_struct;
73struct file_handle;
74struct user_msghdr;
75
76/*
77 * Forward declaration for kernels >= 5.6
78 */
79struct timex;
80
81#ifdef IA32_NR_syscalls
82#define NR_compat_syscalls IA32_NR_syscalls
83#else
84#define NR_compat_syscalls NR_syscalls
85#endif
86
87/*
88 * Create LTTng tracepoint probes.
89 */
90#define LTTNG_PACKAGE_BUILD
91#define CREATE_TRACE_POINTS
92#define TP_MODULE_NOINIT
93#define TRACE_INCLUDE_PATH instrumentation/syscalls/headers
94
95#define PARAMS(args...) args
96
97/* Handle unknown syscalls */
98#undef TRACE_SYSTEM
99#define TRACE_SYSTEM syscalls_unknown
100#include <instrumentation/syscalls/headers/syscalls_unknown.h>
101#undef TRACE_SYSTEM
102
103#define SC_ENTER
104
105#undef sc_exit
106#define sc_exit(...)
107#undef sc_in
108#define sc_in(...) __VA_ARGS__
109#undef sc_out
110#define sc_out(...)
111#undef sc_inout
112#define sc_inout(...) __VA_ARGS__
113
114/* Hijack probe callback for system call enter */
115#undef TP_PROBE_CB
116#define TP_PROBE_CB(_template) &syscall_entry_probe
117#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
118 LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
119 PARAMS(_fields))
120#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
121 LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
122 PARAMS(_locvar), PARAMS(_code_pre), \
123 PARAMS(_fields), PARAMS(_code_post))
124#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
125 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields))
126#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
127 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name)
128/* Enumerations only defined at first inclusion. */
129#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \
130 LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values))
131#undef TRACE_SYSTEM
132#define TRACE_SYSTEM syscall_entry_integers
133#define TRACE_INCLUDE_FILE syscalls_integers
134#include <instrumentation/syscalls/headers/syscalls_integers.h>
135#undef TRACE_INCLUDE_FILE
136#undef TRACE_SYSTEM
137#define TRACE_SYSTEM syscall_entry_pointers
138#define TRACE_INCLUDE_FILE syscalls_pointers
139#include <instrumentation/syscalls/headers/syscalls_pointers.h>
140#undef TRACE_INCLUDE_FILE
141#undef TRACE_SYSTEM
142#undef SC_LTTNG_TRACEPOINT_ENUM
143#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
144#undef SC_LTTNG_TRACEPOINT_EVENT
145#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
146#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
147#undef TP_PROBE_CB
148#undef _TRACE_SYSCALLS_INTEGERS_H
149#undef _TRACE_SYSCALLS_POINTERS_H
150
151/* Hijack probe callback for compat system call enter */
152#define TP_PROBE_CB(_template) &syscall_entry_probe
153#define LTTNG_SC_COMPAT
154#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
155 LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
156 PARAMS(_fields))
157#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
158 LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
159 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
160#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
161 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields))
162#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
163 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \
164 compat_syscall_entry_##_name)
165/* Enumerations only defined at inital inclusion (not here). */
166#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
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_ENUM
178#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
179#undef SC_LTTNG_TRACEPOINT_EVENT
180#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
181#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
182#undef TP_PROBE_CB
183#undef _TRACE_SYSCALLS_INTEGERS_H
184#undef _TRACE_SYSCALLS_POINTERS_H
185#undef LTTNG_SC_COMPAT
186
187#undef SC_ENTER
188
189#define SC_EXIT
190
191#undef sc_exit
192#define sc_exit(...) __VA_ARGS__
193#undef sc_in
194#define sc_in(...)
195#undef sc_out
196#define sc_out(...) __VA_ARGS__
197#undef sc_inout
198#define sc_inout(...) __VA_ARGS__
199
200/* Hijack probe callback for system call exit */
201#define TP_PROBE_CB(_template) &syscall_exit_probe
202#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
203 LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
204 PARAMS(_fields))
205#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
206 LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
207 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
208#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
209 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields))
210#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
211 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \
212 syscall_exit_##_name)
213/* Enumerations only defined at inital inclusion (not here). */
214#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
215#define TRACE_SYSTEM syscall_exit_integers
216#define TRACE_INCLUDE_FILE syscalls_integers
217#include <instrumentation/syscalls/headers/syscalls_integers.h>
218#undef TRACE_INCLUDE_FILE
219#undef TRACE_SYSTEM
220#define TRACE_SYSTEM syscall_exit_pointers
221#define TRACE_INCLUDE_FILE syscalls_pointers
222#include <instrumentation/syscalls/headers/syscalls_pointers.h>
223#undef TRACE_INCLUDE_FILE
224#undef TRACE_SYSTEM
225#undef SC_LTTNG_TRACEPOINT_ENUM
226#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
227#undef SC_LTTNG_TRACEPOINT_EVENT
228#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
229#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
230#undef TP_PROBE_CB
231#undef _TRACE_SYSCALLS_INTEGERS_H
232#undef _TRACE_SYSCALLS_POINTERS_H
233
234
235/* Hijack probe callback for compat system call exit */
236#define TP_PROBE_CB(_template) &syscall_exit_probe
237#define LTTNG_SC_COMPAT
238#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
239 LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
240 PARAMS(_fields))
241#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
242 LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
243 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
244#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
245 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields))
246#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
247 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \
248 compat_syscall_exit_##_name)
249/* Enumerations only defined at inital inclusion (not here). */
250#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
251#define TRACE_SYSTEM compat_syscall_exit_integers
252#define TRACE_INCLUDE_FILE compat_syscalls_integers
253#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
254#undef TRACE_INCLUDE_FILE
255#undef TRACE_SYSTEM
256#define TRACE_SYSTEM compat_syscall_exit_pointers
257#define TRACE_INCLUDE_FILE compat_syscalls_pointers
258#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
259#undef TRACE_INCLUDE_FILE
260#undef TRACE_SYSTEM
261#undef SC_LTTNG_TRACEPOINT_ENUM
262#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
263#undef SC_LTTNG_TRACEPOINT_EVENT
264#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
265#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
266#undef TP_PROBE_CB
267#undef _TRACE_SYSCALLS_INTEGERS_H
268#undef _TRACE_SYSCALLS_POINTERS_H
269#undef LTTNG_SC_COMPAT
270
271#undef SC_EXIT
272
273#undef TP_MODULE_NOINIT
274#undef LTTNG_PACKAGE_BUILD
275#undef CREATE_TRACE_POINTS
276
277struct trace_syscall_entry {
278 void *func;
279 const struct lttng_event_desc *desc;
280 const struct lttng_event_field *fields;
281 unsigned int nrargs;
282};
283
284#define CREATE_SYSCALL_TABLE
285
286#define SC_ENTER
287
288#undef sc_exit
289#define sc_exit(...)
290
291#undef TRACE_SYSCALL_TABLE
292#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
293 [ _nr ] = { \
294 .func = __event_probe__syscall_entry_##_template, \
295 .nrargs = (_nrargs), \
296 .fields = __event_fields___syscall_entry_##_template, \
297 .desc = &__event_desc___syscall_entry_##_name, \
298 },
299
300/* Syscall enter tracing table */
301static const struct trace_syscall_entry sc_table[] = {
302#include <instrumentation/syscalls/headers/syscalls_integers.h>
303#include <instrumentation/syscalls/headers/syscalls_pointers.h>
304};
305
306#undef TRACE_SYSCALL_TABLE
307#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
308 [ _nr ] = { \
309 .func = __event_probe__compat_syscall_entry_##_template, \
310 .nrargs = (_nrargs), \
311 .fields = __event_fields___compat_syscall_entry_##_template, \
312 .desc = &__event_desc___compat_syscall_entry_##_name, \
313 },
314
315/* Compat syscall enter table */
316const struct trace_syscall_entry compat_sc_table[] = {
317#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
318#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
319};
320
321#undef SC_ENTER
322
323#define SC_EXIT
324
325#undef sc_exit
326#define sc_exit(...) __VA_ARGS__
327
328#undef TRACE_SYSCALL_TABLE
329#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
330 [ _nr ] = { \
331 .func = __event_probe__syscall_exit_##_template, \
332 .nrargs = (_nrargs), \
333 .fields = __event_fields___syscall_exit_##_template, \
334 .desc = &__event_desc___syscall_exit_##_name, \
335 },
336
337/* Syscall exit table */
338static const struct trace_syscall_entry sc_exit_table[] = {
339#include <instrumentation/syscalls/headers/syscalls_integers.h>
340#include <instrumentation/syscalls/headers/syscalls_pointers.h>
341};
342
343#undef TRACE_SYSCALL_TABLE
344#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
345 [ _nr ] = { \
346 .func = __event_probe__compat_syscall_exit_##_template, \
347 .nrargs = (_nrargs), \
348 .fields = __event_fields___compat_syscall_exit_##_template, \
349 .desc = &__event_desc___compat_syscall_exit_##_name, \
350 },
351
352/* Compat syscall exit table */
353const struct trace_syscall_entry compat_sc_exit_table[] = {
354#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
355#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
356};
357
358#undef SC_EXIT
359
360#undef CREATE_SYSCALL_TABLE
361
362struct lttng_syscall_filter {
363 DECLARE_BITMAP(sc, NR_syscalls);
364 DECLARE_BITMAP(sc_compat, NR_compat_syscalls);
365};
366
367static void syscall_entry_unknown(struct lttng_event *event,
368 struct pt_regs *regs, unsigned int id)
369{
370 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
371
372 lttng_syscall_get_arguments(current, regs, args);
373 if (unlikely(in_compat_syscall()))
374 __event_probe__compat_syscall_entry_unknown(event, id, args);
375 else
376 __event_probe__syscall_entry_unknown(event, id, args);
377}
378
379void syscall_entry_probe(void *__data, struct pt_regs *regs, long id)
380{
381 struct lttng_channel *chan = __data;
382 struct lttng_event *event, *unknown_event;
383 const struct trace_syscall_entry *table, *entry;
384 size_t table_len;
385
386 if (unlikely(in_compat_syscall())) {
387 struct lttng_syscall_filter *filter;
388
389 filter = lttng_rcu_dereference(chan->sc_filter);
390 if (filter) {
391 if (id < 0 || id >= NR_compat_syscalls
392 || !test_bit(id, filter->sc_compat)) {
393 /* System call filtered out. */
394 return;
395 }
396 }
397 table = compat_sc_table;
398 table_len = ARRAY_SIZE(compat_sc_table);
399 unknown_event = chan->sc_compat_unknown;
400 } else {
401 struct lttng_syscall_filter *filter;
402
403 filter = lttng_rcu_dereference(chan->sc_filter);
404 if (filter) {
405 if (id < 0 || id >= NR_syscalls
406 || !test_bit(id, filter->sc)) {
407 /* System call filtered out. */
408 return;
409 }
410 }
411 table = sc_table;
412 table_len = ARRAY_SIZE(sc_table);
413 unknown_event = chan->sc_unknown;
414 }
415 if (unlikely(id < 0 || id >= table_len)) {
416 syscall_entry_unknown(unknown_event, regs, id);
417 return;
418 }
419 if (unlikely(in_compat_syscall()))
420 event = chan->compat_sc_table[id];
421 else
422 event = chan->sc_table[id];
423 if (unlikely(!event)) {
424 syscall_entry_unknown(unknown_event, regs, id);
425 return;
426 }
427 entry = &table[id];
428 WARN_ON_ONCE(!entry);
429
430 switch (entry->nrargs) {
431 case 0:
432 {
433 void (*fptr)(void *__data) = entry->func;
434
435 fptr(event);
436 break;
437 }
438 case 1:
439 {
440 void (*fptr)(void *__data, unsigned long arg0) = entry->func;
441 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
442
443 lttng_syscall_get_arguments(current, regs, args);
444 fptr(event, args[0]);
445 break;
446 }
447 case 2:
448 {
449 void (*fptr)(void *__data,
450 unsigned long arg0,
451 unsigned long arg1) = entry->func;
452 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
453
454 lttng_syscall_get_arguments(current, regs, args);
455 fptr(event, args[0], args[1]);
456 break;
457 }
458 case 3:
459 {
460 void (*fptr)(void *__data,
461 unsigned long arg0,
462 unsigned long arg1,
463 unsigned long arg2) = entry->func;
464 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
465
466 lttng_syscall_get_arguments(current, regs, args);
467 fptr(event, args[0], args[1], args[2]);
468 break;
469 }
470 case 4:
471 {
472 void (*fptr)(void *__data,
473 unsigned long arg0,
474 unsigned long arg1,
475 unsigned long arg2,
476 unsigned long arg3) = entry->func;
477 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
478
479 lttng_syscall_get_arguments(current, regs, args);
480 fptr(event, args[0], args[1], args[2], args[3]);
481 break;
482 }
483 case 5:
484 {
485 void (*fptr)(void *__data,
486 unsigned long arg0,
487 unsigned long arg1,
488 unsigned long arg2,
489 unsigned long arg3,
490 unsigned long arg4) = entry->func;
491 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
492
493 lttng_syscall_get_arguments(current, regs, args);
494 fptr(event, args[0], args[1], args[2], args[3], args[4]);
495 break;
496 }
497 case 6:
498 {
499 void (*fptr)(void *__data,
500 unsigned long arg0,
501 unsigned long arg1,
502 unsigned long arg2,
503 unsigned long arg3,
504 unsigned long arg4,
505 unsigned long arg5) = entry->func;
506 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
507
508 lttng_syscall_get_arguments(current, regs, args);
509 fptr(event, args[0], args[1], args[2],
510 args[3], args[4], args[5]);
511 break;
512 }
513 default:
514 break;
515 }
516}
517
518static void syscall_exit_unknown(struct lttng_event *event,
519 struct pt_regs *regs, int id, long ret)
520{
521 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
522
523 lttng_syscall_get_arguments(current, regs, args);
524 if (unlikely(in_compat_syscall()))
525 __event_probe__compat_syscall_exit_unknown(event, id, ret,
526 args);
527 else
528 __event_probe__syscall_exit_unknown(event, id, ret, args);
529}
530
531void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
532{
533 struct lttng_channel *chan = __data;
534 struct lttng_event *event, *unknown_event;
535 const struct trace_syscall_entry *table, *entry;
536 size_t table_len;
537 long id;
538
539 id = syscall_get_nr(current, regs);
540 if (unlikely(in_compat_syscall())) {
541 struct lttng_syscall_filter *filter;
542
543 filter = lttng_rcu_dereference(chan->sc_filter);
544 if (filter) {
545 if (id < 0 || id >= NR_compat_syscalls
546 || !test_bit(id, filter->sc_compat)) {
547 /* System call filtered out. */
548 return;
549 }
550 }
551 table = compat_sc_exit_table;
552 table_len = ARRAY_SIZE(compat_sc_exit_table);
553 unknown_event = chan->compat_sc_exit_unknown;
554 } else {
555 struct lttng_syscall_filter *filter;
556
557 filter = lttng_rcu_dereference(chan->sc_filter);
558 if (filter) {
559 if (id < 0 || id >= NR_syscalls
560 || !test_bit(id, filter->sc)) {
561 /* System call filtered out. */
562 return;
563 }
564 }
565 table = sc_exit_table;
566 table_len = ARRAY_SIZE(sc_exit_table);
567 unknown_event = chan->sc_exit_unknown;
568 }
569 if (unlikely(id < 0 || id >= table_len)) {
570 syscall_exit_unknown(unknown_event, regs, id, ret);
571 return;
572 }
573 if (unlikely(in_compat_syscall()))
574 event = chan->compat_sc_exit_table[id];
575 else
576 event = chan->sc_exit_table[id];
577 if (unlikely(!event)) {
578 syscall_exit_unknown(unknown_event, regs, id, ret);
579 return;
580 }
581 entry = &table[id];
582 WARN_ON_ONCE(!entry);
583
584 switch (entry->nrargs) {
585 case 0:
586 {
587 void (*fptr)(void *__data, long ret) = entry->func;
588
589 fptr(event, ret);
590 break;
591 }
592 case 1:
593 {
594 void (*fptr)(void *__data,
595 long ret,
596 unsigned long arg0) = entry->func;
597 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
598
599 lttng_syscall_get_arguments(current, regs, args);
600 fptr(event, ret, args[0]);
601 break;
602 }
603 case 2:
604 {
605 void (*fptr)(void *__data,
606 long ret,
607 unsigned long arg0,
608 unsigned long arg1) = entry->func;
609 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
610
611 lttng_syscall_get_arguments(current, regs, args);
612 fptr(event, ret, args[0], args[1]);
613 break;
614 }
615 case 3:
616 {
617 void (*fptr)(void *__data,
618 long ret,
619 unsigned long arg0,
620 unsigned long arg1,
621 unsigned long arg2) = entry->func;
622 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
623
624 lttng_syscall_get_arguments(current, regs, args);
625 fptr(event, ret, args[0], args[1], args[2]);
626 break;
627 }
628 case 4:
629 {
630 void (*fptr)(void *__data,
631 long ret,
632 unsigned long arg0,
633 unsigned long arg1,
634 unsigned long arg2,
635 unsigned long arg3) = entry->func;
636 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
637
638 lttng_syscall_get_arguments(current, regs, args);
639 fptr(event, ret, args[0], args[1], args[2], args[3]);
640 break;
641 }
642 case 5:
643 {
644 void (*fptr)(void *__data,
645 long ret,
646 unsigned long arg0,
647 unsigned long arg1,
648 unsigned long arg2,
649 unsigned long arg3,
650 unsigned long arg4) = entry->func;
651 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
652
653 lttng_syscall_get_arguments(current, regs, args);
654 fptr(event, ret, args[0], args[1], args[2], args[3], args[4]);
655 break;
656 }
657 case 6:
658 {
659 void (*fptr)(void *__data,
660 long ret,
661 unsigned long arg0,
662 unsigned long arg1,
663 unsigned long arg2,
664 unsigned long arg3,
665 unsigned long arg4,
666 unsigned long arg5) = entry->func;
667 unsigned long args[LTTNG_SYSCALL_NR_ARGS];
668
669 lttng_syscall_get_arguments(current, regs, args);
670 fptr(event, ret, args[0], args[1], args[2],
671 args[3], args[4], args[5]);
672 break;
673 }
674 default:
675 break;
676 }
677}
678
679/*
680 * noinline to diminish caller stack size.
681 * Should be called with sessions lock held.
682 */
683static
684int fill_table(const struct trace_syscall_entry *table, size_t table_len,
685 struct lttng_event **chan_table, struct lttng_channel *chan,
686 void *filter, enum sc_type type)
687{
688 const struct lttng_event_desc *desc;
689 unsigned int i;
690
691 /* Allocate events for each syscall, insert into table */
692 for (i = 0; i < table_len; i++) {
693 struct lttng_kernel_event ev;
694 desc = table[i].desc;
695
696 if (!desc) {
697 /* Unknown syscall */
698 continue;
699 }
700 /*
701 * Skip those already populated by previous failed
702 * register for this channel.
703 */
704 if (chan_table[i])
705 continue;
706 memset(&ev, 0, sizeof(ev));
707 switch (type) {
708 case SC_TYPE_ENTRY:
709 strncpy(ev.name, SYSCALL_ENTRY_STR,
710 LTTNG_KERNEL_SYM_NAME_LEN);
711 break;
712 case SC_TYPE_EXIT:
713 strncpy(ev.name, SYSCALL_EXIT_STR,
714 LTTNG_KERNEL_SYM_NAME_LEN);
715 break;
716 case SC_TYPE_COMPAT_ENTRY:
717 strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR,
718 LTTNG_KERNEL_SYM_NAME_LEN);
719 break;
720 case SC_TYPE_COMPAT_EXIT:
721 strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR,
722 LTTNG_KERNEL_SYM_NAME_LEN);
723 break;
724 default:
725 BUG_ON(1);
726 break;
727 }
728 strncat(ev.name, desc->name,
729 LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1);
730 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
731 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
732 chan_table[i] = _lttng_event_create(chan, &ev, filter,
733 desc, ev.instrumentation);
734 WARN_ON_ONCE(!chan_table[i]);
735 if (IS_ERR(chan_table[i])) {
736 /*
737 * If something goes wrong in event registration
738 * after the first one, we have no choice but to
739 * leave the previous events in there, until
740 * deleted by session teardown.
741 */
742 return PTR_ERR(chan_table[i]);
743 }
744 }
745 return 0;
746}
747
748/*
749 * Should be called with sessions lock held.
750 */
751int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
752{
753 struct lttng_kernel_event ev;
754 int ret;
755
756 wrapper_vmalloc_sync_all();
757
758 if (!chan->sc_table) {
759 /* create syscall table mapping syscall to events */
760 chan->sc_table = kzalloc(sizeof(struct lttng_event *)
761 * ARRAY_SIZE(sc_table), GFP_KERNEL);
762 if (!chan->sc_table)
763 return -ENOMEM;
764 }
765 if (!chan->sc_exit_table) {
766 /* create syscall table mapping syscall to events */
767 chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *)
768 * ARRAY_SIZE(sc_exit_table), GFP_KERNEL);
769 if (!chan->sc_exit_table)
770 return -ENOMEM;
771 }
772
773
774#ifdef CONFIG_COMPAT
775 if (!chan->compat_sc_table) {
776 /* create syscall table mapping compat syscall to events */
777 chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *)
778 * ARRAY_SIZE(compat_sc_table), GFP_KERNEL);
779 if (!chan->compat_sc_table)
780 return -ENOMEM;
781 }
782
783 if (!chan->compat_sc_exit_table) {
784 /* create syscall table mapping compat syscall to events */
785 chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *)
786 * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL);
787 if (!chan->compat_sc_exit_table)
788 return -ENOMEM;
789 }
790#endif
791 if (!chan->sc_unknown) {
792 const struct lttng_event_desc *desc =
793 &__event_desc___syscall_entry_unknown;
794
795 memset(&ev, 0, sizeof(ev));
796 strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
797 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
798 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
799 chan->sc_unknown = _lttng_event_create(chan, &ev, filter,
800 desc,
801 ev.instrumentation);
802 WARN_ON_ONCE(!chan->sc_unknown);
803 if (IS_ERR(chan->sc_unknown)) {
804 return PTR_ERR(chan->sc_unknown);
805 }
806 }
807
808 if (!chan->sc_compat_unknown) {
809 const struct lttng_event_desc *desc =
810 &__event_desc___compat_syscall_entry_unknown;
811
812 memset(&ev, 0, sizeof(ev));
813 strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
814 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
815 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
816 chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter,
817 desc,
818 ev.instrumentation);
819 WARN_ON_ONCE(!chan->sc_unknown);
820 if (IS_ERR(chan->sc_compat_unknown)) {
821 return PTR_ERR(chan->sc_compat_unknown);
822 }
823 }
824
825 if (!chan->compat_sc_exit_unknown) {
826 const struct lttng_event_desc *desc =
827 &__event_desc___compat_syscall_exit_unknown;
828
829 memset(&ev, 0, sizeof(ev));
830 strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
831 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
832 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
833 chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev,
834 filter, desc,
835 ev.instrumentation);
836 WARN_ON_ONCE(!chan->compat_sc_exit_unknown);
837 if (IS_ERR(chan->compat_sc_exit_unknown)) {
838 return PTR_ERR(chan->compat_sc_exit_unknown);
839 }
840 }
841
842 if (!chan->sc_exit_unknown) {
843 const struct lttng_event_desc *desc =
844 &__event_desc___syscall_exit_unknown;
845
846 memset(&ev, 0, sizeof(ev));
847 strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
848 ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
849 ev.instrumentation = LTTNG_KERNEL_SYSCALL;
850 chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter,
851 desc, ev.instrumentation);
852 WARN_ON_ONCE(!chan->sc_exit_unknown);
853 if (IS_ERR(chan->sc_exit_unknown)) {
854 return PTR_ERR(chan->sc_exit_unknown);
855 }
856 }
857
858 ret = fill_table(sc_table, ARRAY_SIZE(sc_table),
859 chan->sc_table, chan, filter, SC_TYPE_ENTRY);
860 if (ret)
861 return ret;
862 ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table),
863 chan->sc_exit_table, chan, filter, SC_TYPE_EXIT);
864 if (ret)
865 return ret;
866
867#ifdef CONFIG_COMPAT
868 ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table),
869 chan->compat_sc_table, chan, filter,
870 SC_TYPE_COMPAT_ENTRY);
871 if (ret)
872 return ret;
873 ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table),
874 chan->compat_sc_exit_table, chan, filter,
875 SC_TYPE_COMPAT_EXIT);
876 if (ret)
877 return ret;
878#endif
879 if (!chan->sys_enter_registered) {
880 ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
881 (void *) syscall_entry_probe, chan);
882 if (ret)
883 return ret;
884 chan->sys_enter_registered = 1;
885 }
886 /*
887 * We change the name of sys_exit tracepoint due to namespace
888 * conflict with sys_exit syscall entry.
889 */
890 if (!chan->sys_exit_registered) {
891 ret = lttng_wrapper_tracepoint_probe_register("sys_exit",
892 (void *) syscall_exit_probe, chan);
893 if (ret) {
894 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
895 (void *) syscall_entry_probe, chan));
896 return ret;
897 }
898 chan->sys_exit_registered = 1;
899 }
900 return ret;
901}
902
903/*
904 * Only called at session destruction.
905 */
906int lttng_syscalls_unregister(struct lttng_channel *chan)
907{
908 int ret;
909
910 if (!chan->sc_table)
911 return 0;
912 if (chan->sys_enter_registered) {
913 ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter",
914 (void *) syscall_entry_probe, chan);
915 if (ret)
916 return ret;
917 chan->sys_enter_registered = 0;
918 }
919 if (chan->sys_exit_registered) {
920 ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit",
921 (void *) syscall_exit_probe, chan);
922 if (ret)
923 return ret;
924 chan->sys_exit_registered = 0;
925 }
926 /* lttng_event destroy will be performed by lttng_session_destroy() */
927 kfree(chan->sc_table);
928 kfree(chan->sc_exit_table);
929#ifdef CONFIG_COMPAT
930 kfree(chan->compat_sc_table);
931 kfree(chan->compat_sc_exit_table);
932#endif
933 kfree(chan->sc_filter);
934 return 0;
935}
936
937static
938int get_syscall_nr(const char *syscall_name)
939{
940 int syscall_nr = -1;
941 int i;
942
943 for (i = 0; i < ARRAY_SIZE(sc_table); i++) {
944 const struct trace_syscall_entry *entry;
945 const char *it_name;
946
947 entry = &sc_table[i];
948 if (!entry->desc)
949 continue;
950 it_name = entry->desc->name;
951 it_name += strlen(SYSCALL_ENTRY_STR);
952 if (!strcmp(syscall_name, it_name)) {
953 syscall_nr = i;
954 break;
955 }
956 }
957 return syscall_nr;
958}
959
960static
961int get_compat_syscall_nr(const char *syscall_name)
962{
963 int syscall_nr = -1;
964 int i;
965
966 for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) {
967 const struct trace_syscall_entry *entry;
968 const char *it_name;
969
970 entry = &compat_sc_table[i];
971 if (!entry->desc)
972 continue;
973 it_name = entry->desc->name;
974 it_name += strlen(COMPAT_SYSCALL_ENTRY_STR);
975 if (!strcmp(syscall_name, it_name)) {
976 syscall_nr = i;
977 break;
978 }
979 }
980 return syscall_nr;
981}
982
983static
984uint32_t get_sc_tables_len(void)
985{
986 return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table);
987}
988
989int lttng_syscall_filter_enable(struct lttng_channel *chan,
990 const char *name)
991{
992 int syscall_nr, compat_syscall_nr, ret;
993 struct lttng_syscall_filter *filter;
994
995 WARN_ON_ONCE(!chan->sc_table);
996
997 if (!name) {
998 /* Enable all system calls by removing filter */
999 if (chan->sc_filter) {
1000 filter = chan->sc_filter;
1001 rcu_assign_pointer(chan->sc_filter, NULL);
1002 synchronize_trace();
1003 kfree(filter);
1004 }
1005 chan->syscall_all = 1;
1006 return 0;
1007 }
1008
1009 if (!chan->sc_filter) {
1010 if (chan->syscall_all) {
1011 /*
1012 * All syscalls are already enabled.
1013 */
1014 return -EEXIST;
1015 }
1016 filter = kzalloc(sizeof(struct lttng_syscall_filter),
1017 GFP_KERNEL);
1018 if (!filter)
1019 return -ENOMEM;
1020 } else {
1021 filter = chan->sc_filter;
1022 }
1023 syscall_nr = get_syscall_nr(name);
1024 compat_syscall_nr = get_compat_syscall_nr(name);
1025 if (syscall_nr < 0 && compat_syscall_nr < 0) {
1026 ret = -ENOENT;
1027 goto error;
1028 }
1029 if (syscall_nr >= 0) {
1030 if (test_bit(syscall_nr, filter->sc)) {
1031 ret = -EEXIST;
1032 goto error;
1033 }
1034 bitmap_set(filter->sc, syscall_nr, 1);
1035 }
1036 if (compat_syscall_nr >= 0) {
1037 if (test_bit(compat_syscall_nr, filter->sc_compat)) {
1038 ret = -EEXIST;
1039 goto error;
1040 }
1041 bitmap_set(filter->sc_compat, compat_syscall_nr, 1);
1042 }
1043 if (!chan->sc_filter)
1044 rcu_assign_pointer(chan->sc_filter, filter);
1045 return 0;
1046
1047error:
1048 if (!chan->sc_filter)
1049 kfree(filter);
1050 return ret;
1051}
1052
1053int lttng_syscall_filter_disable(struct lttng_channel *chan,
1054 const char *name)
1055{
1056 int syscall_nr, compat_syscall_nr, ret;
1057 struct lttng_syscall_filter *filter;
1058
1059 WARN_ON_ONCE(!chan->sc_table);
1060
1061 if (!chan->sc_filter) {
1062 if (!chan->syscall_all)
1063 return -EEXIST;
1064 filter = kzalloc(sizeof(struct lttng_syscall_filter),
1065 GFP_KERNEL);
1066 if (!filter)
1067 return -ENOMEM;
1068 /* Trace all system calls, then apply disable. */
1069 bitmap_set(filter->sc, 0, NR_syscalls);
1070 bitmap_set(filter->sc_compat, 0, NR_compat_syscalls);
1071 } else {
1072 filter = chan->sc_filter;
1073 }
1074
1075 if (!name) {
1076 /* Fail if all syscalls are already disabled. */
1077 if (bitmap_empty(filter->sc, NR_syscalls)
1078 && bitmap_empty(filter->sc_compat,
1079 NR_compat_syscalls)) {
1080 ret = -EEXIST;
1081 goto error;
1082 }
1083
1084 /* Disable all system calls */
1085 bitmap_clear(filter->sc, 0, NR_syscalls);
1086 bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);
1087 goto apply_filter;
1088 }
1089 syscall_nr = get_syscall_nr(name);
1090 compat_syscall_nr = get_compat_syscall_nr(name);
1091 if (syscall_nr < 0 && compat_syscall_nr < 0) {
1092 ret = -ENOENT;
1093 goto error;
1094 }
1095 if (syscall_nr >= 0) {
1096 if (!test_bit(syscall_nr, filter->sc)) {
1097 ret = -EEXIST;
1098 goto error;
1099 }
1100 bitmap_clear(filter->sc, syscall_nr, 1);
1101 }
1102 if (compat_syscall_nr >= 0) {
1103 if (!test_bit(compat_syscall_nr, filter->sc_compat)) {
1104 ret = -EEXIST;
1105 goto error;
1106 }
1107 bitmap_clear(filter->sc_compat, compat_syscall_nr, 1);
1108 }
1109apply_filter:
1110 if (!chan->sc_filter)
1111 rcu_assign_pointer(chan->sc_filter, filter);
1112 chan->syscall_all = 0;
1113 return 0;
1114
1115error:
1116 if (!chan->sc_filter)
1117 kfree(filter);
1118 return ret;
1119}
1120
1121static
1122const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos)
1123{
1124 const struct trace_syscall_entry *entry;
1125 int iter = 0;
1126
1127 for (entry = sc_table;
1128 entry < sc_table + ARRAY_SIZE(sc_table);
1129 entry++) {
1130 if (iter++ >= *pos)
1131 return entry;
1132 }
1133 for (entry = compat_sc_table;
1134 entry < compat_sc_table + ARRAY_SIZE(compat_sc_table);
1135 entry++) {
1136 if (iter++ >= *pos)
1137 return entry;
1138 }
1139 /* End of list */
1140 return NULL;
1141}
1142
1143static
1144void *syscall_list_start(struct seq_file *m, loff_t *pos)
1145{
1146 return (void *) syscall_list_get_entry(pos);
1147}
1148
1149static
1150void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos)
1151{
1152 (*ppos)++;
1153 return (void *) syscall_list_get_entry(ppos);
1154}
1155
1156static
1157void syscall_list_stop(struct seq_file *m, void *p)
1158{
1159}
1160
1161static
1162int get_sc_table(const struct trace_syscall_entry *entry,
1163 const struct trace_syscall_entry **table,
1164 unsigned int *bitness)
1165{
1166 if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) {
1167 if (bitness)
1168 *bitness = BITS_PER_LONG;
1169 if (table)
1170 *table = sc_table;
1171 return 0;
1172 }
1173 if (!(entry >= compat_sc_table
1174 && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) {
1175 return -EINVAL;
1176 }
1177 if (bitness)
1178 *bitness = 32;
1179 if (table)
1180 *table = compat_sc_table;
1181 return 0;
1182}
1183
1184static
1185int syscall_list_show(struct seq_file *m, void *p)
1186{
1187 const struct trace_syscall_entry *table, *entry = p;
1188 unsigned int bitness;
1189 unsigned long index;
1190 int ret;
1191 const char *name;
1192
1193 ret = get_sc_table(entry, &table, &bitness);
1194 if (ret)
1195 return ret;
1196 if (!entry->desc)
1197 return 0;
1198 if (table == sc_table) {
1199 index = entry - table;
1200 name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)];
1201 } else {
1202 index = (entry - table) + ARRAY_SIZE(sc_table);
1203 name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)];
1204 }
1205 seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n",
1206 index, name, bitness);
1207 return 0;
1208}
1209
1210static
1211const struct seq_operations lttng_syscall_list_seq_ops = {
1212 .start = syscall_list_start,
1213 .next = syscall_list_next,
1214 .stop = syscall_list_stop,
1215 .show = syscall_list_show,
1216};
1217
1218static
1219int lttng_syscall_list_open(struct inode *inode, struct file *file)
1220{
1221 return seq_open(file, &lttng_syscall_list_seq_ops);
1222}
1223
1224const struct file_operations lttng_syscall_list_fops = {
1225 .owner = THIS_MODULE,
1226 .open = lttng_syscall_list_open,
1227 .read = seq_read,
1228 .llseek = seq_lseek,
1229 .release = seq_release,
1230};
1231
1232long lttng_channel_syscall_mask(struct lttng_channel *channel,
1233 struct lttng_kernel_syscall_mask __user *usyscall_mask)
1234{
1235 uint32_t len, sc_tables_len, bitmask_len;
1236 int ret = 0, bit;
1237 char *tmp_mask;
1238 struct lttng_syscall_filter *filter;
1239
1240 ret = get_user(len, &usyscall_mask->len);
1241 if (ret)
1242 return ret;
1243 sc_tables_len = get_sc_tables_len();
1244 bitmask_len = ALIGN(sc_tables_len, 8) >> 3;
1245 if (len < sc_tables_len) {
1246 return put_user(sc_tables_len, &usyscall_mask->len);
1247 }
1248 /* Array is large enough, we can copy array to user-space. */
1249 tmp_mask = kzalloc(bitmask_len, GFP_KERNEL);
1250 if (!tmp_mask)
1251 return -ENOMEM;
1252 filter = channel->sc_filter;
1253
1254 for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) {
1255 char state;
1256
1257 if (channel->sc_table) {
1258 if (filter)
1259 state = test_bit(bit, filter->sc);
1260 else
1261 state = 1;
1262 } else {
1263 state = 0;
1264 }
1265 bt_bitfield_write_be(tmp_mask, char, bit, 1, state);
1266 }
1267 for (; bit < sc_tables_len; bit++) {
1268 char state;
1269
1270 if (channel->compat_sc_table) {
1271 if (filter)
1272 state = test_bit(bit - ARRAY_SIZE(sc_table),
1273 filter->sc_compat);
1274 else
1275 state = 1;
1276 } else {
1277 state = 0;
1278 }
1279 bt_bitfield_write_be(tmp_mask, char, bit, 1, state);
1280 }
1281 if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len))
1282 ret = -EFAULT;
1283 kfree(tmp_mask);
1284 return ret;
1285}
1286
1287int lttng_abi_syscall_list(void)
1288{
1289 struct file *syscall_list_file;
1290 int file_fd, ret;
1291
1292 file_fd = lttng_get_unused_fd();
1293 if (file_fd < 0) {
1294 ret = file_fd;
1295 goto fd_error;
1296 }
1297
1298 syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
1299 &lttng_syscall_list_fops,
1300 NULL, O_RDWR);
1301 if (IS_ERR(syscall_list_file)) {
1302 ret = PTR_ERR(syscall_list_file);
1303 goto file_error;
1304 }
1305 ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
1306 if (ret < 0)
1307 goto open_error;
1308 fd_install(file_fd, syscall_list_file);
1309 return file_fd;
1310
1311open_error:
1312 fput(syscall_list_file);
1313file_error:
1314 put_unused_fd(file_fd);
1315fd_error:
1316 return ret;
1317}
LTTng 2.0/0.x modules
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