1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * LTTng syscall probes.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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>
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 <linux/fcntl.h>
22 #include <linux/mman.h>
23 #include <asm/ptrace.h>
24 #include <asm/syscall.h>
26 #include <lttng/bitfield.h>
27 #include <wrapper/tracepoint.h>
28 #include <wrapper/file.h>
29 #include <wrapper/rcu.h>
30 #include <wrapper/syscall.h>
31 #include <lttng/events.h>
32 #include <lttng/events-internal.h>
33 #include <lttng/utils.h>
35 #include "lttng-syscalls.h"
38 # ifndef is_compat_task
39 # define is_compat_task() (0)
43 /* in_compat_syscall appears in kernel 4.6. */
44 #ifndef in_compat_syscall
45 #define in_compat_syscall() is_compat_task()
55 #define SYSCALL_ENTRY_TOK syscall_entry_
56 #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_
57 #define SYSCALL_EXIT_TOK syscall_exit_
58 #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_
60 #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK)
61 #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK)
62 #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK)
63 #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK)
65 void syscall_entry_event_probe(void *__data
, struct pt_regs
*regs
, long id
);
66 void syscall_exit_event_probe(void *__data
, struct pt_regs
*regs
, long ret
);
69 * Forward declarations for old kernels.
73 struct oldold_utsname
;
75 struct sel_arg_struct
;
76 struct mmap_arg_struct
;
81 * Forward declaration for kernels >= 5.6
88 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
89 typedef __kernel_old_time_t
time_t;
92 #ifdef IA32_NR_syscalls
93 #define NR_compat_syscalls IA32_NR_syscalls
95 #define NR_compat_syscalls NR_syscalls
99 * Create LTTng tracepoint probes.
101 #define LTTNG_PACKAGE_BUILD
102 #define CREATE_TRACE_POINTS
103 #define TP_MODULE_NOINIT
104 #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers
106 #define PARAMS(args...) args
108 /* Handle unknown syscalls */
110 #define TRACE_SYSTEM syscalls_unknown
111 #include <instrumentation/syscalls/headers/syscalls_unknown.h>
116 extern const struct trace_syscall_table sc_table
;
117 extern const struct trace_syscall_table compat_sc_table
;
119 /* Event syscall exit table */
120 extern const struct trace_syscall_table sc_exit_table
;
121 extern const struct trace_syscall_table compat_sc_exit_table
;
126 #undef CREATE_SYSCALL_TABLE
128 struct lttng_syscall_filter
{
129 DECLARE_BITMAP(sc_entry
, NR_syscalls
);
130 DECLARE_BITMAP(sc_exit
, NR_syscalls
);
131 DECLARE_BITMAP(sc_compat_entry
, NR_compat_syscalls
);
132 DECLARE_BITMAP(sc_compat_exit
, NR_compat_syscalls
);
136 int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common
*event_enabler
);
138 static void syscall_entry_event_unknown(struct hlist_head
*unknown_action_list_head
,
139 struct pt_regs
*regs
, long id
)
141 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
142 struct lttng_kernel_event_common_private
*event_priv
;
144 lttng_syscall_get_arguments(current
, regs
, args
);
145 lttng_hlist_for_each_entry_rcu(event_priv
, unknown_action_list_head
, u
.syscall
.node
) {
146 if (unlikely(in_compat_syscall()))
147 __event_probe__compat_syscall_entry_unknown(event_priv
->pub
, id
, args
);
149 __event_probe__syscall_entry_unknown(event_priv
->pub
, id
, args
);
153 static __always_inline
154 void syscall_entry_event_call_func(struct hlist_head
*action_list
,
155 void *func
, unsigned int nrargs
,
156 struct pt_regs
*regs
)
158 struct lttng_kernel_event_common_private
*event_priv
;
163 void (*fptr
)(void *__data
) = func
;
165 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
166 fptr(event_priv
->pub
);
171 void (*fptr
)(void *__data
, unsigned long arg0
) = func
;
172 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
174 lttng_syscall_get_arguments(current
, regs
, args
);
175 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
176 fptr(event_priv
->pub
, args
[0]);
181 void (*fptr
)(void *__data
,
183 unsigned long arg1
) = func
;
184 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
186 lttng_syscall_get_arguments(current
, regs
, args
);
187 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
188 fptr(event_priv
->pub
, args
[0], args
[1]);
193 void (*fptr
)(void *__data
,
196 unsigned long arg2
) = func
;
197 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
199 lttng_syscall_get_arguments(current
, regs
, args
);
200 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
201 fptr(event_priv
->pub
, args
[0], args
[1], args
[2]);
206 void (*fptr
)(void *__data
,
210 unsigned long arg3
) = func
;
211 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
213 lttng_syscall_get_arguments(current
, regs
, args
);
214 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
215 fptr(event_priv
->pub
, args
[0], args
[1], args
[2], args
[3]);
220 void (*fptr
)(void *__data
,
225 unsigned long arg4
) = func
;
226 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
228 lttng_syscall_get_arguments(current
, regs
, args
);
229 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
230 fptr(event_priv
->pub
, args
[0], args
[1], args
[2], args
[3], args
[4]);
235 void (*fptr
)(void *__data
,
241 unsigned long arg5
) = func
;
242 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
244 lttng_syscall_get_arguments(current
, regs
, args
);
245 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
246 fptr(event_priv
->pub
, args
[0], args
[1], args
[2],
247 args
[3], args
[4], args
[5]);
255 void syscall_entry_event_probe(void *__data
, struct pt_regs
*regs
, long id
)
257 struct lttng_kernel_syscall_table
*syscall_table
= __data
;
258 struct hlist_head
*action_list
, *unknown_action_list
;
259 const struct trace_syscall_entry
*table
, *entry
;
262 if (unlikely(in_compat_syscall())) {
263 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
265 if (id
< 0 || id
>= NR_compat_syscalls
266 || (!READ_ONCE(syscall_table
->syscall_all_entry
) && !test_bit(id
, filter
->sc_compat_entry
))) {
267 /* System call filtered out. */
270 table
= compat_sc_table
.table
;
271 table_len
= compat_sc_table
.len
;
272 unknown_action_list
= &syscall_table
->compat_unknown_syscall_dispatch
;
274 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
276 if (id
< 0 || id
>= NR_syscalls
277 || (!READ_ONCE(syscall_table
->syscall_all_entry
) && !test_bit(id
, filter
->sc_entry
))) {
278 /* System call filtered out. */
281 table
= sc_table
.table
;
282 table_len
= sc_table
.len
;
283 unknown_action_list
= &syscall_table
->unknown_syscall_dispatch
;
285 if (unlikely(id
< 0 || id
>= table_len
)) {
286 syscall_entry_event_unknown(unknown_action_list
, regs
, id
);
291 if (!entry
->event_func
) {
292 syscall_entry_event_unknown(unknown_action_list
, regs
, id
);
296 if (unlikely(in_compat_syscall())) {
297 action_list
= &syscall_table
->compat_syscall_dispatch
[id
];
299 action_list
= &syscall_table
->syscall_dispatch
[id
];
301 if (unlikely(hlist_empty(action_list
)))
304 syscall_entry_event_call_func(action_list
, entry
->event_func
, entry
->nrargs
, regs
);
307 static void syscall_exit_event_unknown(struct hlist_head
*unknown_action_list_head
,
308 struct pt_regs
*regs
, long id
, long ret
)
310 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
311 struct lttng_kernel_event_common_private
*event_priv
;
313 lttng_syscall_get_arguments(current
, regs
, args
);
314 lttng_hlist_for_each_entry_rcu(event_priv
, unknown_action_list_head
, u
.syscall
.node
) {
315 if (unlikely(in_compat_syscall()))
316 __event_probe__compat_syscall_exit_unknown(event_priv
->pub
, id
, ret
,
319 __event_probe__syscall_exit_unknown(event_priv
->pub
, id
, ret
, args
);
323 static __always_inline
324 void syscall_exit_event_call_func(struct hlist_head
*action_list
,
325 void *func
, unsigned int nrargs
,
326 struct pt_regs
*regs
, long ret
)
328 struct lttng_kernel_event_common_private
*event_priv
;
333 void (*fptr
)(void *__data
, long ret
) = func
;
335 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
336 fptr(event_priv
->pub
, ret
);
341 void (*fptr
)(void *__data
,
343 unsigned long arg0
) = func
;
344 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
346 lttng_syscall_get_arguments(current
, regs
, args
);
347 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
348 fptr(event_priv
->pub
, ret
, args
[0]);
353 void (*fptr
)(void *__data
,
356 unsigned long arg1
) = func
;
357 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
359 lttng_syscall_get_arguments(current
, regs
, args
);
360 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
361 fptr(event_priv
->pub
, ret
, args
[0], args
[1]);
366 void (*fptr
)(void *__data
,
370 unsigned long arg2
) = func
;
371 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
373 lttng_syscall_get_arguments(current
, regs
, args
);
374 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
375 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2]);
380 void (*fptr
)(void *__data
,
385 unsigned long arg3
) = func
;
386 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
388 lttng_syscall_get_arguments(current
, regs
, args
);
389 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
390 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2], args
[3]);
395 void (*fptr
)(void *__data
,
401 unsigned long arg4
) = func
;
402 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
404 lttng_syscall_get_arguments(current
, regs
, args
);
405 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
406 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2], args
[3], args
[4]);
411 void (*fptr
)(void *__data
,
418 unsigned long arg5
) = func
;
419 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
421 lttng_syscall_get_arguments(current
, regs
, args
);
422 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
423 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2],
424 args
[3], args
[4], args
[5]);
432 void syscall_exit_event_probe(void *__data
, struct pt_regs
*regs
, long ret
)
434 struct lttng_kernel_syscall_table
*syscall_table
= __data
;
435 struct hlist_head
*action_list
, *unknown_action_list
;
436 const struct trace_syscall_entry
*table
, *entry
;
440 id
= syscall_get_nr(current
, regs
);
442 if (unlikely(in_compat_syscall())) {
443 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
445 if (id
< 0 || id
>= NR_compat_syscalls
446 || (!READ_ONCE(syscall_table
->syscall_all_exit
) && !test_bit(id
, filter
->sc_compat_exit
))) {
447 /* System call filtered out. */
450 table
= compat_sc_exit_table
.table
;
451 table_len
= compat_sc_exit_table
.len
;
452 unknown_action_list
= &syscall_table
->compat_unknown_syscall_exit_dispatch
;
454 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
456 if (id
< 0 || id
>= NR_syscalls
457 || (!READ_ONCE(syscall_table
->syscall_all_exit
) && !test_bit(id
, filter
->sc_exit
))) {
458 /* System call filtered out. */
461 table
= sc_exit_table
.table
;
462 table_len
= sc_exit_table
.len
;
463 unknown_action_list
= &syscall_table
->unknown_syscall_exit_dispatch
;
465 if (unlikely(id
< 0 || id
>= table_len
)) {
466 syscall_exit_event_unknown(unknown_action_list
, regs
, id
, ret
);
471 if (!entry
->event_func
) {
472 syscall_exit_event_unknown(unknown_action_list
, regs
, id
, ret
);
476 if (unlikely(in_compat_syscall())) {
477 action_list
= &syscall_table
->compat_syscall_exit_dispatch
[id
];
479 action_list
= &syscall_table
->syscall_exit_dispatch
[id
];
481 if (unlikely(hlist_empty(action_list
)))
484 syscall_exit_event_call_func(action_list
, entry
->event_func
, entry
->nrargs
,
489 struct lttng_kernel_syscall_table
*get_syscall_table_from_enabler(struct lttng_event_enabler_common
*event_enabler
)
491 switch (event_enabler
->enabler_type
) {
492 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
494 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
495 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
496 return &event_recorder_enabler
->chan
->priv
->parent
.syscall_table
;
498 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
500 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
501 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
502 return &event_notifier_enabler
->group
->syscall_table
;
510 struct lttng_kernel_syscall_table
*get_syscall_table_from_event(struct lttng_kernel_event_common
*event
)
512 switch (event
->type
) {
513 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
515 struct lttng_kernel_event_recorder
*event_recorder
=
516 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
517 return &event_recorder
->chan
->priv
->parent
.syscall_table
;
519 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
521 struct lttng_kernel_event_notifier
*event_notifier
=
522 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
523 return &event_notifier
->priv
->group
->syscall_table
;
531 * noinline to diminish caller stack size.
532 * Should be called with sessions lock held.
535 int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry
*table
, size_t table_len
,
536 struct hlist_head
*chan_table
, struct lttng_event_recorder_enabler
*syscall_event_enabler
,
539 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&syscall_event_enabler
->parent
);
540 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(&syscall_event_enabler
->parent
);
541 struct lttng_kernel_channel_buffer
*chan
= syscall_event_enabler
->chan
;
544 /* Allocate events for each syscall matching enabler, insert into table */
545 for (i
= 0; i
< table_len
; i
++) {
546 const struct lttng_kernel_event_desc
*desc
= table
[i
].desc
;
547 struct lttng_event_recorder_enabler
*event_enabler
;
548 struct lttng_kernel_abi_event ev
;
549 struct lttng_kernel_event_common
*event
;
550 struct lttng_kernel_event_common_private
*event_priv
;
551 struct hlist_head
*head
;
555 /* Unknown syscall */
558 if (lttng_desc_match_enabler(desc
,
559 lttng_event_recorder_enabler_as_enabler(syscall_event_enabler
)) <= 0)
562 * Check if already created.
564 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
565 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
566 if (event_priv
->desc
== desc
567 && get_syscall_table_from_event(event_priv
->pub
) == syscall_table
)
573 /* We need to create an event for this syscall/enabler. */
574 memset(&ev
, 0, sizeof(ev
));
577 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
578 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
581 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
582 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
584 case SC_TYPE_COMPAT_ENTRY
:
585 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
586 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
588 case SC_TYPE_COMPAT_EXIT
:
589 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
590 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
593 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1);
594 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
595 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
596 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
597 if (!event_enabler
) {
600 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
601 WARN_ON_ONCE(!event
);
602 lttng_event_enabler_destroy(&event_enabler
->parent
);
605 * If something goes wrong in event registration
606 * after the first one, we have no choice but to
607 * leave the previous events in there, until
608 * deleted by session teardown.
610 return PTR_ERR(event
);
612 hlist_add_head(&event
->priv
->u
.syscall
.node
, &chan_table
[i
]);
618 int lttng_syscalls_populate_events(struct lttng_event_enabler_common
*syscall_event_enabler
)
620 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(syscall_event_enabler
);
621 struct lttng_event_recorder_enabler
*event_recorder_enabler
;
622 struct lttng_kernel_channel_buffer
*chan
;
623 struct lttng_kernel_abi_event ev
;
626 if (syscall_event_enabler
->enabler_type
!= LTTNG_EVENT_ENABLER_TYPE_RECORDER
)
628 event_recorder_enabler
= container_of(syscall_event_enabler
, struct lttng_event_recorder_enabler
, parent
);
629 chan
= event_recorder_enabler
->chan
;
631 if (hlist_empty(&syscall_table
->unknown_syscall_dispatch
)) {
632 const struct lttng_kernel_event_desc
*desc
=
633 &__event_desc___syscall_entry_unknown
;
634 struct lttng_kernel_event_common
*event
;
635 struct lttng_event_recorder_enabler
*event_enabler
;
637 memset(&ev
, 0, sizeof(ev
));
638 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
639 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
640 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
641 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
642 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
643 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
644 if (!event_enabler
) {
647 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
648 lttng_event_enabler_destroy(&event_enabler
->parent
);
649 WARN_ON_ONCE(!event
);
651 return PTR_ERR(event
);
653 hlist_add_head(&event
->priv
->u
.syscall
.node
, &syscall_table
->unknown_syscall_dispatch
);
656 if (hlist_empty(&syscall_table
->compat_unknown_syscall_dispatch
)) {
657 const struct lttng_kernel_event_desc
*desc
=
658 &__event_desc___compat_syscall_entry_unknown
;
659 struct lttng_kernel_event_common
*event
;
660 struct lttng_event_recorder_enabler
*event_enabler
;
662 memset(&ev
, 0, sizeof(ev
));
663 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
664 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
665 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
666 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
667 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
668 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
669 if (!event_enabler
) {
672 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
673 WARN_ON_ONCE(!event
);
674 lttng_event_enabler_destroy(&event_enabler
->parent
);
676 return PTR_ERR(event
);
678 hlist_add_head(&event
->priv
->u
.syscall
.node
, &syscall_table
->compat_unknown_syscall_dispatch
);
681 if (hlist_empty(&syscall_table
->compat_unknown_syscall_exit_dispatch
)) {
682 const struct lttng_kernel_event_desc
*desc
=
683 &__event_desc___compat_syscall_exit_unknown
;
684 struct lttng_kernel_event_common
*event
;
685 struct lttng_event_recorder_enabler
*event_enabler
;
687 memset(&ev
, 0, sizeof(ev
));
688 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
689 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
690 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
691 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
692 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
693 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
694 if (!event_enabler
) {
697 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
698 WARN_ON_ONCE(!event
);
699 lttng_event_enabler_destroy(&event_enabler
->parent
);
701 return PTR_ERR(event
);
703 hlist_add_head(&event
->priv
->u
.syscall
.node
, &syscall_table
->compat_unknown_syscall_exit_dispatch
);
706 if (hlist_empty(&syscall_table
->unknown_syscall_exit_dispatch
)) {
707 const struct lttng_kernel_event_desc
*desc
=
708 &__event_desc___syscall_exit_unknown
;
709 struct lttng_kernel_event_common
*event
;
710 struct lttng_event_recorder_enabler
*event_enabler
;
712 memset(&ev
, 0, sizeof(ev
));
713 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
714 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
715 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
716 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
717 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
718 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
719 if (!event_enabler
) {
722 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
723 WARN_ON_ONCE(!event
);
724 lttng_event_enabler_destroy(&event_enabler
->parent
);
726 return PTR_ERR(event
);
728 hlist_add_head(&event
->priv
->u
.syscall
.node
, &syscall_table
->unknown_syscall_exit_dispatch
);
731 ret
= lttng_create_syscall_event_if_missing(sc_table
.table
, sc_table
.len
,
732 syscall_table
->syscall_dispatch
, event_recorder_enabler
, SC_TYPE_ENTRY
);
735 ret
= lttng_create_syscall_event_if_missing(sc_exit_table
.table
, sc_exit_table
.len
,
736 syscall_table
->syscall_exit_dispatch
, event_recorder_enabler
, SC_TYPE_EXIT
);
741 ret
= lttng_create_syscall_event_if_missing(compat_sc_table
.table
, compat_sc_table
.len
,
742 syscall_table
->compat_syscall_dispatch
, event_recorder_enabler
, SC_TYPE_COMPAT_ENTRY
);
745 ret
= lttng_create_syscall_event_if_missing(compat_sc_exit_table
.table
, compat_sc_exit_table
.len
,
746 syscall_table
->compat_syscall_exit_dispatch
, event_recorder_enabler
, SC_TYPE_COMPAT_EXIT
);
754 * Should be called with sessions lock held.
756 int lttng_syscalls_register_event(struct lttng_event_enabler_common
*syscall_event_enabler
)
758 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(syscall_event_enabler
);
761 if (!syscall_table
->syscall_dispatch
) {
762 /* create syscall table mapping syscall to events */
763 syscall_table
->syscall_dispatch
= kzalloc(sizeof(struct hlist_head
) * sc_table
.len
, GFP_KERNEL
);
764 if (!syscall_table
->syscall_dispatch
)
767 if (!syscall_table
->syscall_exit_dispatch
) {
768 /* create syscall table mapping syscall to events */
769 syscall_table
->syscall_exit_dispatch
= kzalloc(sizeof(struct hlist_head
) * sc_exit_table
.len
, GFP_KERNEL
);
770 if (!syscall_table
->syscall_exit_dispatch
)
776 if (!syscall_table
->compat_syscall_dispatch
) {
777 /* create syscall table mapping compat syscall to events */
778 syscall_table
->compat_syscall_dispatch
= kzalloc(sizeof(struct hlist_head
) * compat_sc_table
.len
, GFP_KERNEL
);
779 if (!syscall_table
->compat_syscall_dispatch
)
783 if (!syscall_table
->compat_syscall_exit_dispatch
) {
784 /* create syscall table mapping compat syscall to events */
785 syscall_table
->compat_syscall_exit_dispatch
= kzalloc(sizeof(struct hlist_head
) * compat_sc_exit_table
.len
, GFP_KERNEL
);
786 if (!syscall_table
->compat_syscall_exit_dispatch
)
790 if (!syscall_table
->sc_filter
) {
791 syscall_table
->sc_filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
793 if (!syscall_table
->sc_filter
)
797 ret
= lttng_syscalls_populate_events(syscall_event_enabler
);
801 wrapper_vmalloc_sync_mappings();
803 if (!syscall_table
->sys_enter_registered
) {
804 ret
= lttng_wrapper_tracepoint_probe_register("sys_enter",
805 (void *) syscall_entry_event_probe
, syscall_table
);
808 syscall_table
->sys_enter_registered
= 1;
810 if (!syscall_table
->sys_exit_registered
) {
811 ret
= lttng_wrapper_tracepoint_probe_register("sys_exit",
812 (void *) syscall_exit_event_probe
, syscall_table
);
814 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
815 (void *) syscall_entry_event_probe
, syscall_table
));
818 syscall_table
->sys_exit_registered
= 1;
821 ret
= lttng_syscalls_create_matching_event_notifiers(syscall_event_enabler
);
829 int create_unknown_event_notifier(
830 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
833 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_notifier_enabler
->parent
);
834 struct lttng_kernel_event_common_private
*event_priv
;
835 struct lttng_kernel_event_common
*event
;
836 const struct lttng_kernel_event_desc
*desc
;
837 struct lttng_event_notifier_group
*group
= event_notifier_enabler
->group
;
838 struct lttng_kernel_syscall_table
*syscall_table
= &group
->syscall_table
;
839 struct lttng_kernel_abi_event_notifier event_notifier_param
;
840 uint64_t user_token
= event_notifier_enabler
->parent
.user_token
;
841 uint64_t error_counter_index
= event_notifier_enabler
->error_counter_index
;
842 struct lttng_event_enabler_common
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
843 event_notifier_enabler
);
844 struct hlist_head
*unknown_dispatch_list
;
847 enum lttng_kernel_abi_syscall_abi abi
;
848 enum lttng_kernel_abi_syscall_entryexit entryexit
;
849 struct hlist_head
*head
;
853 desc
= &__event_desc___syscall_entry_unknown
;
854 unknown_dispatch_list
= &syscall_table
->unknown_syscall_dispatch
;
855 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
856 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
859 desc
= &__event_desc___syscall_exit_unknown
;
860 unknown_dispatch_list
= &syscall_table
->unknown_syscall_exit_dispatch
;
861 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
862 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
864 case SC_TYPE_COMPAT_ENTRY
:
865 desc
= &__event_desc___compat_syscall_entry_unknown
;
866 unknown_dispatch_list
= &syscall_table
->compat_unknown_syscall_dispatch
;
867 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
868 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
870 case SC_TYPE_COMPAT_EXIT
:
871 desc
= &__event_desc___compat_syscall_exit_unknown
;
872 unknown_dispatch_list
= &syscall_table
->compat_unknown_syscall_exit_dispatch
;
873 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
874 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
881 * Check if already created.
883 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
884 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
885 if (event_priv
->desc
== desc
&&
886 event_priv
->user_token
== base_enabler
->user_token
)
892 memset(&event_notifier_param
, 0, sizeof(event_notifier_param
));
893 strncat(event_notifier_param
.event
.name
, desc
->event_name
,
894 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- strlen(event_notifier_param
.event
.name
) - 1);
896 event_notifier_param
.event
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
898 event_notifier_param
.event
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
899 event_notifier_param
.event
.token
= user_token
;
900 event_notifier_param
.event
.u
.syscall
.abi
= abi
;
901 event_notifier_param
.event
.u
.syscall
.entryexit
= entryexit
;
902 event_notifier_param
.error_counter_index
= error_counter_index
;
904 event_notifier_enabler
= lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME
,
905 &event_notifier_param
, group
);
906 WARN_ON_ONCE(!event_notifier_enabler
);
907 event
= _lttng_kernel_event_create(&event_notifier_enabler
->parent
, desc
);
908 lttng_event_enabler_destroy(&event_notifier_enabler
->parent
);
910 printk(KERN_INFO
"Unable to create unknown notifier %s\n",
916 hlist_add_head_rcu(&event
->priv
->u
.syscall
.node
, unknown_dispatch_list
);
922 static int create_matching_event_notifiers(
923 struct lttng_event_notifier_enabler
*syscall_event_notifier_enabler
,
924 const struct trace_syscall_entry
*table
,
925 size_t table_len
, enum sc_type type
)
927 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&syscall_event_notifier_enabler
->parent
);
928 struct lttng_event_notifier_group
*group
= syscall_event_notifier_enabler
->group
;
929 const struct lttng_kernel_event_desc
*desc
;
930 uint64_t user_token
= syscall_event_notifier_enabler
->parent
.user_token
;
931 uint64_t error_counter_index
= syscall_event_notifier_enabler
->error_counter_index
;
935 /* iterate over all syscall and create event_notifier that match */
936 for (i
= 0; i
< table_len
; i
++) {
937 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
938 struct lttng_kernel_event_common_private
*event_priv
;
939 struct lttng_kernel_event_common
*event
;
940 struct lttng_kernel_abi_event_notifier event_notifier_param
;
941 struct hlist_head
*head
;
944 desc
= table
[i
].desc
;
946 /* Unknown syscall */
950 if (!lttng_desc_match_enabler(desc
,
951 lttng_event_notifier_enabler_as_enabler(syscall_event_notifier_enabler
)))
955 * Check if already created.
957 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
958 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
959 if (event_priv
->desc
== desc
960 && event_priv
->user_token
== syscall_event_notifier_enabler
->parent
.user_token
)
966 memset(&event_notifier_param
, 0, sizeof(event_notifier_param
));
969 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
970 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
973 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
974 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
976 case SC_TYPE_COMPAT_ENTRY
:
977 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
978 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
980 case SC_TYPE_COMPAT_EXIT
:
981 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
982 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
985 strncat(event_notifier_param
.event
.name
, desc
->event_name
,
986 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- strlen(event_notifier_param
.event
.name
) - 1);
987 event_notifier_param
.event
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
988 event_notifier_param
.event
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
989 event_notifier_param
.event
.token
= user_token
;
990 event_notifier_param
.error_counter_index
= error_counter_index
;
992 event_notifier_enabler
= lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME
,
993 &event_notifier_param
, group
);
994 WARN_ON_ONCE(!event_notifier_enabler
);
995 event
= _lttng_kernel_event_create(&event_notifier_enabler
->parent
, desc
);
996 lttng_event_enabler_destroy(&event_notifier_enabler
->parent
);
998 printk(KERN_INFO
"Unable to create event_notifier %s\n",
1004 event
->priv
->u
.syscall
.syscall_id
= i
;
1013 int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common
*event_enabler
)
1016 enum lttng_kernel_abi_syscall_entryexit entryexit
=
1017 event_enabler
->event_param
.u
.syscall
.entryexit
;
1018 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1020 if (event_enabler
->enabler_type
!= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
)
1022 event_notifier_enabler
= container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
1024 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
) {
1025 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1026 sc_table
.table
, sc_table
.len
, SC_TYPE_ENTRY
);
1030 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1031 compat_sc_table
.table
, compat_sc_table
.len
,
1032 SC_TYPE_COMPAT_ENTRY
);
1036 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1041 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1042 SC_TYPE_COMPAT_ENTRY
);
1047 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
) {
1048 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1049 sc_exit_table
.table
, sc_exit_table
.len
,
1054 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1059 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1060 compat_sc_exit_table
.table
, compat_sc_exit_table
.len
,
1061 SC_TYPE_COMPAT_EXIT
);
1065 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1066 SC_TYPE_COMPAT_EXIT
);
1075 int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table
*syscall_table
)
1079 if (!syscall_table
->syscall_dispatch
)
1081 if (syscall_table
->sys_enter_registered
) {
1082 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_enter",
1083 (void *) syscall_entry_event_probe
, syscall_table
);
1086 syscall_table
->sys_enter_registered
= 0;
1088 if (syscall_table
->sys_exit_registered
) {
1089 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_exit",
1090 (void *) syscall_exit_event_probe
, syscall_table
);
1093 syscall_table
->sys_exit_registered
= 0;
1098 int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table
*syscall_table
)
1100 kfree(syscall_table
->syscall_dispatch
);
1101 kfree(syscall_table
->syscall_exit_dispatch
);
1102 #ifdef CONFIG_COMPAT
1103 kfree(syscall_table
->compat_syscall_dispatch
);
1104 kfree(syscall_table
->compat_syscall_exit_dispatch
);
1106 kfree(syscall_table
->sc_filter
);
1111 int get_syscall_nr(const char *syscall_name
)
1113 int syscall_nr
= -1;
1116 for (i
= 0; i
< sc_table
.len
; i
++) {
1117 const struct trace_syscall_entry
*entry
;
1118 const char *it_name
;
1120 entry
= &sc_table
.table
[i
];
1123 it_name
= entry
->desc
->event_name
;
1124 it_name
+= strlen(SYSCALL_ENTRY_STR
);
1125 if (!strcmp(syscall_name
, it_name
)) {
1134 int get_compat_syscall_nr(const char *syscall_name
)
1136 int syscall_nr
= -1;
1139 for (i
= 0; i
< compat_sc_table
.len
; i
++) {
1140 const struct trace_syscall_entry
*entry
;
1141 const char *it_name
;
1143 entry
= &compat_sc_table
.table
[i
];
1146 it_name
= entry
->desc
->event_name
;
1147 it_name
+= strlen(COMPAT_SYSCALL_ENTRY_STR
);
1148 if (!strcmp(syscall_name
, it_name
)) {
1157 uint32_t get_sc_tables_len(void)
1159 return sc_table
.len
+ compat_sc_table
.len
;
1163 const char *get_syscall_name(const char *desc_name
,
1164 enum lttng_syscall_abi abi
,
1165 enum lttng_syscall_entryexit entryexit
)
1167 size_t prefix_len
= 0;
1170 switch (entryexit
) {
1171 case LTTNG_SYSCALL_ENTRY
:
1173 case LTTNG_SYSCALL_ABI_NATIVE
:
1174 prefix_len
= strlen(SYSCALL_ENTRY_STR
);
1176 case LTTNG_SYSCALL_ABI_COMPAT
:
1177 prefix_len
= strlen(COMPAT_SYSCALL_ENTRY_STR
);
1181 case LTTNG_SYSCALL_EXIT
:
1183 case LTTNG_SYSCALL_ABI_NATIVE
:
1184 prefix_len
= strlen(SYSCALL_EXIT_STR
);
1186 case LTTNG_SYSCALL_ABI_COMPAT
:
1187 prefix_len
= strlen(COMPAT_SYSCALL_EXIT_STR
);
1192 WARN_ON_ONCE(prefix_len
== 0);
1193 return desc_name
+ prefix_len
;
1197 int lttng_syscall_filter_enable(
1198 struct lttng_syscall_filter
*filter
,
1199 const char *desc_name
, enum lttng_syscall_abi abi
,
1200 enum lttng_syscall_entryexit entryexit
)
1202 const char *syscall_name
;
1203 unsigned long *bitmap
;
1206 syscall_name
= get_syscall_name(desc_name
, abi
, entryexit
);
1209 case LTTNG_SYSCALL_ABI_NATIVE
:
1210 syscall_nr
= get_syscall_nr(syscall_name
);
1212 case LTTNG_SYSCALL_ABI_COMPAT
:
1213 syscall_nr
= get_compat_syscall_nr(syscall_name
);
1221 switch (entryexit
) {
1222 case LTTNG_SYSCALL_ENTRY
:
1224 case LTTNG_SYSCALL_ABI_NATIVE
:
1225 bitmap
= filter
->sc_entry
;
1227 case LTTNG_SYSCALL_ABI_COMPAT
:
1228 bitmap
= filter
->sc_compat_entry
;
1234 case LTTNG_SYSCALL_EXIT
:
1236 case LTTNG_SYSCALL_ABI_NATIVE
:
1237 bitmap
= filter
->sc_exit
;
1239 case LTTNG_SYSCALL_ABI_COMPAT
:
1240 bitmap
= filter
->sc_compat_exit
;
1249 if (test_bit(syscall_nr
, bitmap
))
1251 bitmap_set(bitmap
, syscall_nr
, 1);
1255 int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common
*event
)
1257 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_event(event
);
1260 WARN_ON_ONCE(event
->priv
->instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
);
1262 ret
= lttng_syscall_filter_enable(syscall_table
->sc_filter
,
1263 event
->priv
->desc
->event_name
, event
->priv
->u
.syscall
.abi
,
1264 event
->priv
->u
.syscall
.entryexit
);
1268 switch (event
->type
) {
1269 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1271 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1273 unsigned int syscall_id
= event
->priv
->u
.syscall
.syscall_id
;
1274 struct hlist_head
*dispatch_list
;
1276 switch (event
->priv
->u
.syscall
.entryexit
) {
1277 case LTTNG_SYSCALL_ENTRY
:
1278 switch (event
->priv
->u
.syscall
.abi
) {
1279 case LTTNG_SYSCALL_ABI_NATIVE
:
1280 dispatch_list
= &syscall_table
->syscall_dispatch
[syscall_id
];
1282 case LTTNG_SYSCALL_ABI_COMPAT
:
1283 dispatch_list
= &syscall_table
->compat_syscall_dispatch
[syscall_id
];
1290 case LTTNG_SYSCALL_EXIT
:
1291 switch (event
->priv
->u
.syscall
.abi
) {
1292 case LTTNG_SYSCALL_ABI_NATIVE
:
1293 dispatch_list
= &syscall_table
->syscall_exit_dispatch
[syscall_id
];
1295 case LTTNG_SYSCALL_ABI_COMPAT
:
1296 dispatch_list
= &syscall_table
->compat_syscall_exit_dispatch
[syscall_id
];
1308 hlist_add_head_rcu(&event
->priv
->u
.syscall
.node
, dispatch_list
);
1320 int lttng_syscall_filter_disable(struct lttng_syscall_filter
*filter
,
1321 const char *desc_name
, enum lttng_syscall_abi abi
,
1322 enum lttng_syscall_entryexit entryexit
)
1324 const char *syscall_name
;
1325 unsigned long *bitmap
;
1328 syscall_name
= get_syscall_name(desc_name
, abi
, entryexit
);
1331 case LTTNG_SYSCALL_ABI_NATIVE
:
1332 syscall_nr
= get_syscall_nr(syscall_name
);
1334 case LTTNG_SYSCALL_ABI_COMPAT
:
1335 syscall_nr
= get_compat_syscall_nr(syscall_name
);
1343 switch (entryexit
) {
1344 case LTTNG_SYSCALL_ENTRY
:
1346 case LTTNG_SYSCALL_ABI_NATIVE
:
1347 bitmap
= filter
->sc_entry
;
1349 case LTTNG_SYSCALL_ABI_COMPAT
:
1350 bitmap
= filter
->sc_compat_entry
;
1356 case LTTNG_SYSCALL_EXIT
:
1358 case LTTNG_SYSCALL_ABI_NATIVE
:
1359 bitmap
= filter
->sc_exit
;
1361 case LTTNG_SYSCALL_ABI_COMPAT
:
1362 bitmap
= filter
->sc_compat_exit
;
1371 if (!test_bit(syscall_nr
, bitmap
))
1373 bitmap_clear(bitmap
, syscall_nr
, 1);
1378 int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common
*event
)
1380 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_event(event
);
1383 ret
= lttng_syscall_filter_disable(syscall_table
->sc_filter
,
1384 event
->priv
->desc
->event_name
, event
->priv
->u
.syscall
.abi
,
1385 event
->priv
->u
.syscall
.entryexit
);
1389 switch (event
->type
) {
1390 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1392 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1394 hlist_del_rcu(&event
->priv
->u
.syscall
.node
);
1405 const struct trace_syscall_entry
*syscall_list_get_entry(loff_t
*pos
)
1407 const struct trace_syscall_entry
*entry
;
1410 for (entry
= sc_table
.table
;
1411 entry
< sc_table
.table
+ sc_table
.len
;
1416 for (entry
= compat_sc_table
.table
;
1417 entry
< compat_sc_table
.table
+ compat_sc_table
.len
;
1427 void *syscall_list_start(struct seq_file
*m
, loff_t
*pos
)
1429 return (void *) syscall_list_get_entry(pos
);
1433 void *syscall_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1436 return (void *) syscall_list_get_entry(ppos
);
1440 void syscall_list_stop(struct seq_file
*m
, void *p
)
1445 int get_sc_table(const struct trace_syscall_entry
*entry
,
1446 const struct trace_syscall_entry
**table
,
1447 unsigned int *bitness
)
1449 if (entry
>= sc_table
.table
&& entry
< sc_table
.table
+ sc_table
.len
) {
1451 *bitness
= BITS_PER_LONG
;
1453 *table
= sc_table
.table
;
1456 if (!(entry
>= compat_sc_table
.table
1457 && entry
< compat_sc_table
.table
+ compat_sc_table
.len
)) {
1463 *table
= compat_sc_table
.table
;
1468 int syscall_list_show(struct seq_file
*m
, void *p
)
1470 const struct trace_syscall_entry
*table
, *entry
= p
;
1471 unsigned int bitness
;
1472 unsigned long index
;
1476 ret
= get_sc_table(entry
, &table
, &bitness
);
1481 if (table
== sc_table
.table
) {
1482 index
= entry
- table
;
1483 name
= &entry
->desc
->event_name
[strlen(SYSCALL_ENTRY_STR
)];
1485 index
= (entry
- table
) + sc_table
.len
;
1486 name
= &entry
->desc
->event_name
[strlen(COMPAT_SYSCALL_ENTRY_STR
)];
1488 seq_printf(m
, "syscall { index = %lu; name = %s; bitness = %u; };\n",
1489 index
, name
, bitness
);
1494 const struct seq_operations lttng_syscall_list_seq_ops
= {
1495 .start
= syscall_list_start
,
1496 .next
= syscall_list_next
,
1497 .stop
= syscall_list_stop
,
1498 .show
= syscall_list_show
,
1502 int lttng_syscall_list_open(struct inode
*inode
, struct file
*file
)
1504 return seq_open(file
, <tng_syscall_list_seq_ops
);
1507 const struct file_operations lttng_syscall_list_fops
= {
1508 .owner
= THIS_MODULE
,
1509 .open
= lttng_syscall_list_open
,
1511 .llseek
= seq_lseek
,
1512 .release
= seq_release
,
1516 * A syscall is enabled if it is traced for either entry or exit.
1518 long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table
*syscall_table
,
1519 struct lttng_kernel_abi_syscall_mask __user
*usyscall_mask
)
1521 uint32_t len
, sc_tables_len
, bitmask_len
;
1524 struct lttng_syscall_filter
*filter
;
1526 ret
= get_user(len
, &usyscall_mask
->len
);
1529 sc_tables_len
= get_sc_tables_len();
1530 bitmask_len
= ALIGN(sc_tables_len
, 8) >> 3;
1531 if (len
< sc_tables_len
) {
1532 return put_user(sc_tables_len
, &usyscall_mask
->len
);
1534 /* Array is large enough, we can copy array to user-space. */
1535 tmp_mask
= kzalloc(bitmask_len
, GFP_KERNEL
);
1538 filter
= syscall_table
->sc_filter
;
1540 for (bit
= 0; bit
< sc_table
.len
; bit
++) {
1543 if (syscall_table
->syscall_dispatch
) {
1544 if (!(READ_ONCE(syscall_table
->syscall_all_entry
)
1545 || READ_ONCE(syscall_table
->syscall_all_exit
)) && filter
)
1546 state
= test_bit(bit
, filter
->sc_entry
)
1547 || test_bit(bit
, filter
->sc_exit
);
1553 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1555 for (; bit
< sc_tables_len
; bit
++) {
1558 if (syscall_table
->compat_syscall_dispatch
) {
1559 if (!(READ_ONCE(syscall_table
->syscall_all_entry
)
1560 || READ_ONCE(syscall_table
->syscall_all_exit
)) && filter
)
1561 state
= test_bit(bit
- sc_table
.len
,
1562 filter
->sc_compat_entry
)
1563 || test_bit(bit
- sc_table
.len
,
1564 filter
->sc_compat_exit
);
1570 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1572 if (copy_to_user(usyscall_mask
->mask
, tmp_mask
, bitmask_len
))
1578 int lttng_abi_syscall_list(void)
1580 struct file
*syscall_list_file
;
1583 file_fd
= lttng_get_unused_fd();
1589 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
1590 <tng_syscall_list_fops
,
1592 if (IS_ERR(syscall_list_file
)) {
1593 ret
= PTR_ERR(syscall_list_file
);
1596 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
1599 fd_install(file_fd
, syscall_list_file
);
1603 fput(syscall_list_file
);
1605 put_unused_fd(file_fd
);