4 * LTTng syscall probes.
6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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.
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
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>
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>
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"
44 # ifndef is_compat_task
45 # define is_compat_task() (0)
49 /* in_compat_syscall appears in kernel 4.6. */
50 #ifndef in_compat_syscall
51 #define in_compat_syscall() is_compat_task()
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_
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)
72 void syscall_entry_probe(void *__data
, struct pt_regs
*regs
, long id
);
74 void syscall_exit_probe(void *__data
, struct pt_regs
*regs
, long ret
);
77 * Forward declarations for old kernels.
81 struct oldold_utsname
;
83 struct sel_arg_struct
;
84 struct mmap_arg_struct
;
87 #ifdef IA32_NR_syscalls
88 #define NR_compat_syscalls IA32_NR_syscalls
90 #define NR_compat_syscalls NR_syscalls
94 * Create LTTng tracepoint probes.
96 #define LTTNG_PACKAGE_BUILD
97 #define CREATE_TRACE_POINTS
98 #define TP_MODULE_NOINIT
99 #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers
101 #define PARAMS(args...) args
103 /* Handle unknown syscalls */
105 #define TRACE_SYSTEM syscalls_unknown
106 #include "instrumentation/syscalls/headers/syscalls_unknown.h"
114 #define sc_in(...) __VA_ARGS__
118 #define sc_inout(...) __VA_ARGS__
120 /* Hijack probe callback for system call enter */
122 #define TP_PROBE_CB(_template) &syscall_entry_probe
123 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
124 LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
126 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _fields) \
127 LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
128 PARAMS(_locvar), PARAMS(_code), \
130 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
131 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields))
132 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
133 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name)
135 #define TRACE_SYSTEM syscall_entry_integers
136 #define TRACE_INCLUDE_FILE syscalls_integers
137 #include "instrumentation/syscalls/headers/syscalls_integers.h"
138 #undef TRACE_INCLUDE_FILE
140 #define TRACE_SYSTEM syscall_entry_pointers
141 #define TRACE_INCLUDE_FILE syscalls_pointers
142 #include "instrumentation/syscalls/headers/syscalls_pointers.h"
143 #undef TRACE_INCLUDE_FILE
145 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
146 #undef SC_LTTNG_TRACEPOINT_EVENT
147 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
148 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
150 #undef _TRACE_SYSCALLS_INTEGERS_H
151 #undef _TRACE_SYSCALLS_POINTERS_H
153 /* Hijack probe callback for compat system call enter */
154 #define TP_PROBE_CB(_template) &syscall_entry_probe
155 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
156 LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
158 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _fields) \
159 LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
160 PARAMS(_locvar), PARAMS(_code), PARAMS(_fields))
161 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
162 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields))
163 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
164 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \
165 compat_syscall_entry_##_name)
166 #define TRACE_SYSTEM compat_syscall_entry_integers
167 #define TRACE_INCLUDE_FILE compat_syscalls_integers
168 #include "instrumentation/syscalls/headers/compat_syscalls_integers.h"
169 #undef TRACE_INCLUDE_FILE
171 #define TRACE_SYSTEM compat_syscall_entry_pointers
172 #define TRACE_INCLUDE_FILE compat_syscalls_pointers
173 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
174 #undef TRACE_INCLUDE_FILE
176 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
177 #undef SC_LTTNG_TRACEPOINT_EVENT
178 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
179 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
181 #undef _TRACE_SYSCALLS_INTEGERS_H
182 #undef _TRACE_SYSCALLS_POINTERS_H
189 #define sc_exit(...) __VA_ARGS__
193 #define sc_out(...) __VA_ARGS__
195 #define sc_inout(...) __VA_ARGS__
197 /* Hijack probe callback for system call exit */
198 #define TP_PROBE_CB(_template) &syscall_exit_probe
199 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
200 LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
202 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _fields) \
203 LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
204 PARAMS(_locvar), PARAMS(_code), PARAMS(_fields))
205 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
206 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields))
207 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
208 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \
209 syscall_exit_##_name)
210 #define TRACE_SYSTEM syscall_exit_integers
211 #define TRACE_INCLUDE_FILE syscalls_integers
212 #include "instrumentation/syscalls/headers/syscalls_integers.h"
213 #undef TRACE_INCLUDE_FILE
215 #define TRACE_SYSTEM syscall_exit_pointers
216 #define TRACE_INCLUDE_FILE syscalls_pointers
217 #include "instrumentation/syscalls/headers/syscalls_pointers.h"
218 #undef TRACE_INCLUDE_FILE
220 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
221 #undef SC_LTTNG_TRACEPOINT_EVENT
222 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
223 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
225 #undef _TRACE_SYSCALLS_INTEGERS_H
226 #undef _TRACE_SYSCALLS_POINTERS_H
229 /* Hijack probe callback for compat system call exit */
230 #define TP_PROBE_CB(_template) &syscall_exit_probe
231 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
232 LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
234 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _fields) \
235 LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
236 PARAMS(_locvar), PARAMS(_code), PARAMS(_fields))
237 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
238 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields))
239 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
240 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \
241 compat_syscall_exit_##_name)
242 #define TRACE_SYSTEM compat_syscall_exit_integers
243 #define TRACE_INCLUDE_FILE compat_syscalls_integers
244 #include "instrumentation/syscalls/headers/compat_syscalls_integers.h"
245 #undef TRACE_INCLUDE_FILE
247 #define TRACE_SYSTEM compat_syscall_exit_pointers
248 #define TRACE_INCLUDE_FILE compat_syscalls_pointers
249 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
250 #undef TRACE_INCLUDE_FILE
252 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
253 #undef SC_LTTNG_TRACEPOINT_EVENT
254 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
255 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
257 #undef _TRACE_SYSCALLS_INTEGERS_H
258 #undef _TRACE_SYSCALLS_POINTERS_H
262 #undef TP_MODULE_NOINIT
263 #undef LTTNG_PACKAGE_BUILD
264 #undef CREATE_TRACE_POINTS
266 struct trace_syscall_entry
{
268 const struct lttng_event_desc
*desc
;
269 const struct lttng_event_field
*fields
;
273 #define CREATE_SYSCALL_TABLE
280 #undef TRACE_SYSCALL_TABLE
281 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
283 .func = __event_probe__syscall_entry_##_template, \
284 .nrargs = (_nrargs), \
285 .fields = __event_fields___syscall_entry_##_template, \
286 .desc = &__event_desc___syscall_entry_##_name, \
289 /* Syscall enter tracing table */
290 static const struct trace_syscall_entry sc_table
[] = {
291 #include "instrumentation/syscalls/headers/syscalls_integers.h"
292 #include "instrumentation/syscalls/headers/syscalls_pointers.h"
295 #undef TRACE_SYSCALL_TABLE
296 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
298 .func = __event_probe__compat_syscall_entry_##_template, \
299 .nrargs = (_nrargs), \
300 .fields = __event_fields___compat_syscall_entry_##_template, \
301 .desc = &__event_desc___compat_syscall_entry_##_name, \
304 /* Compat syscall enter table */
305 const struct trace_syscall_entry compat_sc_table
[] = {
306 #include "instrumentation/syscalls/headers/compat_syscalls_integers.h"
307 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
315 #define sc_exit(...) __VA_ARGS__
317 #undef TRACE_SYSCALL_TABLE
318 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
320 .func = __event_probe__syscall_exit_##_template, \
321 .nrargs = (_nrargs), \
322 .fields = __event_fields___syscall_exit_##_template, \
323 .desc = &__event_desc___syscall_exit_##_name, \
326 /* Syscall exit table */
327 static const struct trace_syscall_entry sc_exit_table
[] = {
328 #include "instrumentation/syscalls/headers/syscalls_integers.h"
329 #include "instrumentation/syscalls/headers/syscalls_pointers.h"
332 #undef TRACE_SYSCALL_TABLE
333 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
335 .func = __event_probe__compat_syscall_exit_##_template, \
336 .nrargs = (_nrargs), \
337 .fields = __event_fields___compat_syscall_exit_##_template, \
338 .desc = &__event_desc___compat_syscall_exit_##_name, \
341 /* Compat syscall exit table */
342 const struct trace_syscall_entry compat_sc_exit_table
[] = {
343 #include "instrumentation/syscalls/headers/compat_syscalls_integers.h"
344 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
349 #undef CREATE_SYSCALL_TABLE
351 struct lttng_syscall_filter
{
352 DECLARE_BITMAP(sc
, NR_syscalls
);
353 DECLARE_BITMAP(sc_compat
, NR_compat_syscalls
);
356 static void syscall_entry_unknown(struct lttng_event
*event
,
357 struct pt_regs
*regs
, unsigned int id
)
359 unsigned long args
[UNKNOWN_SYSCALL_NRARGS
];
361 syscall_get_arguments(current
, regs
, 0, UNKNOWN_SYSCALL_NRARGS
, args
);
362 if (unlikely(in_compat_syscall()))
363 __event_probe__compat_syscall_entry_unknown(event
, id
, args
);
365 __event_probe__syscall_entry_unknown(event
, id
, args
);
368 void syscall_entry_probe(void *__data
, struct pt_regs
*regs
, long id
)
370 struct lttng_channel
*chan
= __data
;
371 struct lttng_event
*event
, *unknown_event
;
372 const struct trace_syscall_entry
*table
, *entry
;
375 if (unlikely(in_compat_syscall())) {
376 struct lttng_syscall_filter
*filter
;
378 filter
= lttng_rcu_dereference(chan
->sc_filter
);
380 if (id
< 0 || id
>= NR_compat_syscalls
381 || !test_bit(id
, filter
->sc_compat
)) {
382 /* System call filtered out. */
386 table
= compat_sc_table
;
387 table_len
= ARRAY_SIZE(compat_sc_table
);
388 unknown_event
= chan
->sc_compat_unknown
;
390 struct lttng_syscall_filter
*filter
;
392 filter
= lttng_rcu_dereference(chan
->sc_filter
);
394 if (id
< 0 || id
>= NR_syscalls
395 || !test_bit(id
, filter
->sc
)) {
396 /* System call filtered out. */
401 table_len
= ARRAY_SIZE(sc_table
);
402 unknown_event
= chan
->sc_unknown
;
404 if (unlikely(id
< 0 || id
>= table_len
)) {
405 syscall_entry_unknown(unknown_event
, regs
, id
);
408 if (unlikely(in_compat_syscall()))
409 event
= chan
->compat_sc_table
[id
];
411 event
= chan
->sc_table
[id
];
412 if (unlikely(!event
)) {
413 syscall_entry_unknown(unknown_event
, regs
, id
);
417 WARN_ON_ONCE(!entry
);
419 switch (entry
->nrargs
) {
422 void (*fptr
)(void *__data
) = entry
->func
;
429 void (*fptr
)(void *__data
, unsigned long arg0
) = entry
->func
;
430 unsigned long args
[1];
432 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
433 fptr(event
, args
[0]);
438 void (*fptr
)(void *__data
,
440 unsigned long arg1
) = entry
->func
;
441 unsigned long args
[2];
443 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
444 fptr(event
, args
[0], args
[1]);
449 void (*fptr
)(void *__data
,
452 unsigned long arg2
) = entry
->func
;
453 unsigned long args
[3];
455 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
456 fptr(event
, args
[0], args
[1], args
[2]);
461 void (*fptr
)(void *__data
,
465 unsigned long arg3
) = entry
->func
;
466 unsigned long args
[4];
468 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
469 fptr(event
, args
[0], args
[1], args
[2], args
[3]);
474 void (*fptr
)(void *__data
,
479 unsigned long arg4
) = entry
->func
;
480 unsigned long args
[5];
482 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
483 fptr(event
, args
[0], args
[1], args
[2], args
[3], args
[4]);
488 void (*fptr
)(void *__data
,
494 unsigned long arg5
) = entry
->func
;
495 unsigned long args
[6];
497 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
498 fptr(event
, args
[0], args
[1], args
[2],
499 args
[3], args
[4], args
[5]);
507 static void syscall_exit_unknown(struct lttng_event
*event
,
508 struct pt_regs
*regs
, int id
, long ret
)
510 unsigned long args
[UNKNOWN_SYSCALL_NRARGS
];
512 syscall_get_arguments(current
, regs
, 0, UNKNOWN_SYSCALL_NRARGS
, args
);
513 if (unlikely(in_compat_syscall()))
514 __event_probe__compat_syscall_exit_unknown(event
, id
, ret
,
517 __event_probe__syscall_exit_unknown(event
, id
, ret
, args
);
520 void syscall_exit_probe(void *__data
, struct pt_regs
*regs
, long ret
)
522 struct lttng_channel
*chan
= __data
;
523 struct lttng_event
*event
, *unknown_event
;
524 const struct trace_syscall_entry
*table
, *entry
;
528 id
= syscall_get_nr(current
, regs
);
529 if (unlikely(in_compat_syscall())) {
530 struct lttng_syscall_filter
*filter
;
532 filter
= lttng_rcu_dereference(chan
->sc_filter
);
534 if (id
< 0 || id
>= NR_compat_syscalls
535 || !test_bit(id
, filter
->sc_compat
)) {
536 /* System call filtered out. */
540 table
= compat_sc_exit_table
;
541 table_len
= ARRAY_SIZE(compat_sc_exit_table
);
542 unknown_event
= chan
->compat_sc_exit_unknown
;
544 struct lttng_syscall_filter
*filter
;
546 filter
= lttng_rcu_dereference(chan
->sc_filter
);
548 if (id
< 0 || id
>= NR_syscalls
549 || !test_bit(id
, filter
->sc
)) {
550 /* System call filtered out. */
554 table
= sc_exit_table
;
555 table_len
= ARRAY_SIZE(sc_exit_table
);
556 unknown_event
= chan
->sc_exit_unknown
;
558 if (unlikely(id
< 0 || id
>= table_len
)) {
559 syscall_exit_unknown(unknown_event
, regs
, id
, ret
);
562 if (unlikely(in_compat_syscall()))
563 event
= chan
->compat_sc_exit_table
[id
];
565 event
= chan
->sc_exit_table
[id
];
566 if (unlikely(!event
)) {
567 syscall_exit_unknown(unknown_event
, regs
, id
, ret
);
571 WARN_ON_ONCE(!entry
);
573 switch (entry
->nrargs
) {
576 void (*fptr
)(void *__data
, long ret
) = entry
->func
;
583 void (*fptr
)(void *__data
,
585 unsigned long arg0
) = entry
->func
;
586 unsigned long args
[1];
588 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
589 fptr(event
, ret
, args
[0]);
594 void (*fptr
)(void *__data
,
597 unsigned long arg1
) = entry
->func
;
598 unsigned long args
[2];
600 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
601 fptr(event
, ret
, args
[0], args
[1]);
606 void (*fptr
)(void *__data
,
610 unsigned long arg2
) = entry
->func
;
611 unsigned long args
[3];
613 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
614 fptr(event
, ret
, args
[0], args
[1], args
[2]);
619 void (*fptr
)(void *__data
,
624 unsigned long arg3
) = entry
->func
;
625 unsigned long args
[4];
627 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
628 fptr(event
, ret
, args
[0], args
[1], args
[2], args
[3]);
633 void (*fptr
)(void *__data
,
639 unsigned long arg4
) = entry
->func
;
640 unsigned long args
[5];
642 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
643 fptr(event
, ret
, args
[0], args
[1], args
[2], args
[3], args
[4]);
648 void (*fptr
)(void *__data
,
655 unsigned long arg5
) = entry
->func
;
656 unsigned long args
[6];
658 syscall_get_arguments(current
, regs
, 0, entry
->nrargs
, args
);
659 fptr(event
, ret
, args
[0], args
[1], args
[2],
660 args
[3], args
[4], args
[5]);
669 * noinline to diminish caller stack size.
670 * Should be called with sessions lock held.
673 int fill_table(const struct trace_syscall_entry
*table
, size_t table_len
,
674 struct lttng_event
**chan_table
, struct lttng_channel
*chan
,
675 void *filter
, enum sc_type type
)
677 const struct lttng_event_desc
*desc
;
680 /* Allocate events for each syscall, insert into table */
681 for (i
= 0; i
< table_len
; i
++) {
682 struct lttng_kernel_event ev
;
683 desc
= table
[i
].desc
;
686 /* Unknown syscall */
690 * Skip those already populated by previous failed
691 * register for this channel.
695 memset(&ev
, 0, sizeof(ev
));
698 strncpy(ev
.name
, SYSCALL_ENTRY_STR
,
699 LTTNG_KERNEL_SYM_NAME_LEN
);
702 strncpy(ev
.name
, SYSCALL_EXIT_STR
,
703 LTTNG_KERNEL_SYM_NAME_LEN
);
705 case SC_TYPE_COMPAT_ENTRY
:
706 strncpy(ev
.name
, COMPAT_SYSCALL_ENTRY_STR
,
707 LTTNG_KERNEL_SYM_NAME_LEN
);
709 case SC_TYPE_COMPAT_EXIT
:
710 strncpy(ev
.name
, COMPAT_SYSCALL_EXIT_STR
,
711 LTTNG_KERNEL_SYM_NAME_LEN
);
717 strncat(ev
.name
, desc
->name
,
718 LTTNG_KERNEL_SYM_NAME_LEN
- strlen(ev
.name
) - 1);
719 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
720 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
721 chan_table
[i
] = _lttng_event_create(chan
, &ev
, filter
,
722 desc
, ev
.instrumentation
);
723 WARN_ON_ONCE(!chan_table
[i
]);
724 if (IS_ERR(chan_table
[i
])) {
726 * If something goes wrong in event registration
727 * after the first one, we have no choice but to
728 * leave the previous events in there, until
729 * deleted by session teardown.
731 return PTR_ERR(chan_table
[i
]);
738 * Should be called with sessions lock held.
740 int lttng_syscalls_register(struct lttng_channel
*chan
, void *filter
)
742 struct lttng_kernel_event ev
;
745 wrapper_vmalloc_sync_all();
747 if (!chan
->sc_table
) {
748 /* create syscall table mapping syscall to events */
749 chan
->sc_table
= kzalloc(sizeof(struct lttng_event
*)
750 * ARRAY_SIZE(sc_table
), GFP_KERNEL
);
754 if (!chan
->sc_exit_table
) {
755 /* create syscall table mapping syscall to events */
756 chan
->sc_exit_table
= kzalloc(sizeof(struct lttng_event
*)
757 * ARRAY_SIZE(sc_exit_table
), GFP_KERNEL
);
758 if (!chan
->sc_exit_table
)
764 if (!chan
->compat_sc_table
) {
765 /* create syscall table mapping compat syscall to events */
766 chan
->compat_sc_table
= kzalloc(sizeof(struct lttng_event
*)
767 * ARRAY_SIZE(compat_sc_table
), GFP_KERNEL
);
768 if (!chan
->compat_sc_table
)
772 if (!chan
->compat_sc_exit_table
) {
773 /* create syscall table mapping compat syscall to events */
774 chan
->compat_sc_exit_table
= kzalloc(sizeof(struct lttng_event
*)
775 * ARRAY_SIZE(compat_sc_exit_table
), GFP_KERNEL
);
776 if (!chan
->compat_sc_exit_table
)
780 if (!chan
->sc_unknown
) {
781 const struct lttng_event_desc
*desc
=
782 &__event_desc___syscall_entry_unknown
;
784 memset(&ev
, 0, sizeof(ev
));
785 strncpy(ev
.name
, desc
->name
, LTTNG_KERNEL_SYM_NAME_LEN
);
786 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
787 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
788 chan
->sc_unknown
= _lttng_event_create(chan
, &ev
, filter
,
791 WARN_ON_ONCE(!chan
->sc_unknown
);
792 if (IS_ERR(chan
->sc_unknown
)) {
793 return PTR_ERR(chan
->sc_unknown
);
797 if (!chan
->sc_compat_unknown
) {
798 const struct lttng_event_desc
*desc
=
799 &__event_desc___compat_syscall_entry_unknown
;
801 memset(&ev
, 0, sizeof(ev
));
802 strncpy(ev
.name
, desc
->name
, LTTNG_KERNEL_SYM_NAME_LEN
);
803 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
804 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
805 chan
->sc_compat_unknown
= _lttng_event_create(chan
, &ev
, filter
,
808 WARN_ON_ONCE(!chan
->sc_unknown
);
809 if (IS_ERR(chan
->sc_compat_unknown
)) {
810 return PTR_ERR(chan
->sc_compat_unknown
);
814 if (!chan
->compat_sc_exit_unknown
) {
815 const struct lttng_event_desc
*desc
=
816 &__event_desc___compat_syscall_exit_unknown
;
818 memset(&ev
, 0, sizeof(ev
));
819 strncpy(ev
.name
, desc
->name
, LTTNG_KERNEL_SYM_NAME_LEN
);
820 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
821 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
822 chan
->compat_sc_exit_unknown
= _lttng_event_create(chan
, &ev
,
825 WARN_ON_ONCE(!chan
->compat_sc_exit_unknown
);
826 if (IS_ERR(chan
->compat_sc_exit_unknown
)) {
827 return PTR_ERR(chan
->compat_sc_exit_unknown
);
831 if (!chan
->sc_exit_unknown
) {
832 const struct lttng_event_desc
*desc
=
833 &__event_desc___syscall_exit_unknown
;
835 memset(&ev
, 0, sizeof(ev
));
836 strncpy(ev
.name
, desc
->name
, LTTNG_KERNEL_SYM_NAME_LEN
);
837 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
838 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
839 chan
->sc_exit_unknown
= _lttng_event_create(chan
, &ev
, filter
,
840 desc
, ev
.instrumentation
);
841 WARN_ON_ONCE(!chan
->sc_exit_unknown
);
842 if (IS_ERR(chan
->sc_exit_unknown
)) {
843 return PTR_ERR(chan
->sc_exit_unknown
);
847 ret
= fill_table(sc_table
, ARRAY_SIZE(sc_table
),
848 chan
->sc_table
, chan
, filter
, SC_TYPE_ENTRY
);
851 ret
= fill_table(sc_exit_table
, ARRAY_SIZE(sc_exit_table
),
852 chan
->sc_exit_table
, chan
, filter
, SC_TYPE_EXIT
);
857 ret
= fill_table(compat_sc_table
, ARRAY_SIZE(compat_sc_table
),
858 chan
->compat_sc_table
, chan
, filter
,
859 SC_TYPE_COMPAT_ENTRY
);
862 ret
= fill_table(compat_sc_exit_table
, ARRAY_SIZE(compat_sc_exit_table
),
863 chan
->compat_sc_exit_table
, chan
, filter
,
864 SC_TYPE_COMPAT_EXIT
);
868 if (!chan
->sys_enter_registered
) {
869 ret
= lttng_wrapper_tracepoint_probe_register("sys_enter",
870 (void *) syscall_entry_probe
, chan
);
873 chan
->sys_enter_registered
= 1;
876 * We change the name of sys_exit tracepoint due to namespace
877 * conflict with sys_exit syscall entry.
879 if (!chan
->sys_exit_registered
) {
880 ret
= lttng_wrapper_tracepoint_probe_register("sys_exit",
881 (void *) syscall_exit_probe
, chan
);
883 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
884 (void *) syscall_entry_probe
, chan
));
887 chan
->sys_exit_registered
= 1;
893 * Only called at session destruction.
895 int lttng_syscalls_unregister(struct lttng_channel
*chan
)
901 if (chan
->sys_enter_registered
) {
902 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_exit",
903 (void *) syscall_exit_probe
, chan
);
906 chan
->sys_enter_registered
= 0;
908 if (chan
->sys_exit_registered
) {
909 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_enter",
910 (void *) syscall_entry_probe
, chan
);
913 chan
->sys_exit_registered
= 0;
915 /* lttng_event destroy will be performed by lttng_session_destroy() */
916 kfree(chan
->sc_table
);
917 kfree(chan
->sc_exit_table
);
919 kfree(chan
->compat_sc_table
);
920 kfree(chan
->compat_sc_exit_table
);
922 kfree(chan
->sc_filter
);
927 int get_syscall_nr(const char *syscall_name
)
932 for (i
= 0; i
< ARRAY_SIZE(sc_table
); i
++) {
933 const struct trace_syscall_entry
*entry
;
936 entry
= &sc_table
[i
];
939 it_name
= entry
->desc
->name
;
940 it_name
+= strlen(SYSCALL_ENTRY_STR
);
941 if (!strcmp(syscall_name
, it_name
)) {
950 int get_compat_syscall_nr(const char *syscall_name
)
955 for (i
= 0; i
< ARRAY_SIZE(compat_sc_table
); i
++) {
956 const struct trace_syscall_entry
*entry
;
959 entry
= &compat_sc_table
[i
];
962 it_name
= entry
->desc
->name
;
963 it_name
+= strlen(COMPAT_SYSCALL_ENTRY_STR
);
964 if (!strcmp(syscall_name
, it_name
)) {
973 uint32_t get_sc_tables_len(void)
975 return ARRAY_SIZE(sc_table
) + ARRAY_SIZE(compat_sc_table
);
978 int lttng_syscall_filter_enable(struct lttng_channel
*chan
,
981 int syscall_nr
, compat_syscall_nr
, ret
;
982 struct lttng_syscall_filter
*filter
;
984 WARN_ON_ONCE(!chan
->sc_table
);
987 /* Enable all system calls by removing filter */
988 if (chan
->sc_filter
) {
989 filter
= chan
->sc_filter
;
990 rcu_assign_pointer(chan
->sc_filter
, NULL
);
994 chan
->syscall_all
= 1;
998 if (!chan
->sc_filter
) {
999 if (chan
->syscall_all
) {
1001 * All syscalls are already enabled.
1005 filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
1010 filter
= chan
->sc_filter
;
1012 syscall_nr
= get_syscall_nr(name
);
1013 compat_syscall_nr
= get_compat_syscall_nr(name
);
1014 if (syscall_nr
< 0 && compat_syscall_nr
< 0) {
1018 if (syscall_nr
>= 0) {
1019 if (test_bit(syscall_nr
, filter
->sc
)) {
1023 bitmap_set(filter
->sc
, syscall_nr
, 1);
1025 if (compat_syscall_nr
>= 0) {
1026 if (test_bit(compat_syscall_nr
, filter
->sc_compat
)) {
1030 bitmap_set(filter
->sc_compat
, compat_syscall_nr
, 1);
1032 if (!chan
->sc_filter
)
1033 rcu_assign_pointer(chan
->sc_filter
, filter
);
1037 if (!chan
->sc_filter
)
1042 int lttng_syscall_filter_disable(struct lttng_channel
*chan
,
1045 int syscall_nr
, compat_syscall_nr
, ret
;
1046 struct lttng_syscall_filter
*filter
;
1048 WARN_ON_ONCE(!chan
->sc_table
);
1050 if (!chan
->sc_filter
) {
1051 if (!chan
->syscall_all
)
1053 filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
1057 /* Trace all system calls, then apply disable. */
1058 bitmap_set(filter
->sc
, 0, NR_syscalls
);
1059 bitmap_set(filter
->sc_compat
, 0, NR_compat_syscalls
);
1061 filter
= chan
->sc_filter
;
1065 /* Fail if all syscalls are already disabled. */
1066 if (bitmap_empty(filter
->sc
, NR_syscalls
)
1067 && bitmap_empty(filter
->sc_compat
,
1068 NR_compat_syscalls
)) {
1073 /* Disable all system calls */
1074 bitmap_clear(filter
->sc
, 0, NR_syscalls
);
1075 bitmap_clear(filter
->sc_compat
, 0, NR_compat_syscalls
);
1078 syscall_nr
= get_syscall_nr(name
);
1079 compat_syscall_nr
= get_compat_syscall_nr(name
);
1080 if (syscall_nr
< 0 && compat_syscall_nr
< 0) {
1084 if (syscall_nr
>= 0) {
1085 if (!test_bit(syscall_nr
, filter
->sc
)) {
1089 bitmap_clear(filter
->sc
, syscall_nr
, 1);
1091 if (compat_syscall_nr
>= 0) {
1092 if (!test_bit(compat_syscall_nr
, filter
->sc_compat
)) {
1096 bitmap_clear(filter
->sc_compat
, compat_syscall_nr
, 1);
1099 if (!chan
->sc_filter
)
1100 rcu_assign_pointer(chan
->sc_filter
, filter
);
1101 chan
->syscall_all
= 0;
1105 if (!chan
->sc_filter
)
1111 const struct trace_syscall_entry
*syscall_list_get_entry(loff_t
*pos
)
1113 const struct trace_syscall_entry
*entry
;
1116 for (entry
= sc_table
;
1117 entry
< sc_table
+ ARRAY_SIZE(sc_table
);
1122 for (entry
= compat_sc_table
;
1123 entry
< compat_sc_table
+ ARRAY_SIZE(compat_sc_table
);
1133 void *syscall_list_start(struct seq_file
*m
, loff_t
*pos
)
1135 return (void *) syscall_list_get_entry(pos
);
1139 void *syscall_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1142 return (void *) syscall_list_get_entry(ppos
);
1146 void syscall_list_stop(struct seq_file
*m
, void *p
)
1151 int get_sc_table(const struct trace_syscall_entry
*entry
,
1152 const struct trace_syscall_entry
**table
,
1153 unsigned int *bitness
)
1155 if (entry
>= sc_table
&& entry
< sc_table
+ ARRAY_SIZE(sc_table
)) {
1157 *bitness
= BITS_PER_LONG
;
1162 if (!(entry
>= compat_sc_table
1163 && entry
< compat_sc_table
+ ARRAY_SIZE(compat_sc_table
))) {
1169 *table
= compat_sc_table
;
1174 int syscall_list_show(struct seq_file
*m
, void *p
)
1176 const struct trace_syscall_entry
*table
, *entry
= p
;
1177 unsigned int bitness
;
1178 unsigned long index
;
1182 ret
= get_sc_table(entry
, &table
, &bitness
);
1187 if (table
== sc_table
) {
1188 index
= entry
- table
;
1189 name
= &entry
->desc
->name
[strlen(SYSCALL_ENTRY_STR
)];
1191 index
= (entry
- table
) + ARRAY_SIZE(sc_table
);
1192 name
= &entry
->desc
->name
[strlen(COMPAT_SYSCALL_ENTRY_STR
)];
1194 seq_printf(m
, "syscall { index = %lu; name = %s; bitness = %u; };\n",
1195 index
, name
, bitness
);
1200 const struct seq_operations lttng_syscall_list_seq_ops
= {
1201 .start
= syscall_list_start
,
1202 .next
= syscall_list_next
,
1203 .stop
= syscall_list_stop
,
1204 .show
= syscall_list_show
,
1208 int lttng_syscall_list_open(struct inode
*inode
, struct file
*file
)
1210 return seq_open(file
, <tng_syscall_list_seq_ops
);
1213 const struct file_operations lttng_syscall_list_fops
= {
1214 .owner
= THIS_MODULE
,
1215 .open
= lttng_syscall_list_open
,
1217 .llseek
= seq_lseek
,
1218 .release
= seq_release
,
1221 long lttng_channel_syscall_mask(struct lttng_channel
*channel
,
1222 struct lttng_kernel_syscall_mask __user
*usyscall_mask
)
1224 uint32_t len
, sc_tables_len
, bitmask_len
;
1227 struct lttng_syscall_filter
*filter
;
1229 ret
= get_user(len
, &usyscall_mask
->len
);
1232 sc_tables_len
= get_sc_tables_len();
1233 bitmask_len
= ALIGN(sc_tables_len
, 8) >> 3;
1234 if (len
< sc_tables_len
) {
1235 return put_user(sc_tables_len
, &usyscall_mask
->len
);
1237 /* Array is large enough, we can copy array to user-space. */
1238 tmp_mask
= kzalloc(bitmask_len
, GFP_KERNEL
);
1241 filter
= channel
->sc_filter
;
1243 for (bit
= 0; bit
< ARRAY_SIZE(sc_table
); bit
++) {
1246 if (channel
->sc_table
) {
1248 state
= test_bit(bit
, filter
->sc
);
1254 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1256 for (; bit
< sc_tables_len
; bit
++) {
1259 if (channel
->compat_sc_table
) {
1261 state
= test_bit(bit
- ARRAY_SIZE(sc_table
),
1268 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1270 if (copy_to_user(usyscall_mask
->mask
, tmp_mask
, bitmask_len
))
1276 int lttng_abi_syscall_list(void)
1278 struct file
*syscall_list_file
;
1281 file_fd
= lttng_get_unused_fd();
1287 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
1288 <tng_syscall_list_fops
,
1290 if (IS_ERR(syscall_list_file
)) {
1291 ret
= PTR_ERR(syscall_list_file
);
1294 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
1297 fd_install(file_fd
, syscall_list_file
);
1301 fput(syscall_list_file
);
1303 put_unused_fd(file_fd
);