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
);
135 static void syscall_entry_event_unknown(struct hlist_head
*unknown_action_list_head
,
136 struct pt_regs
*regs
, long id
)
138 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
139 struct lttng_kernel_event_common_private
*event_priv
;
141 lttng_syscall_get_arguments(current
, regs
, args
);
142 lttng_hlist_for_each_entry_rcu(event_priv
, unknown_action_list_head
, u
.syscall
.node
) {
143 if (unlikely(in_compat_syscall()))
144 __event_probe__compat_syscall_entry_unknown(event_priv
->pub
, id
, args
);
146 __event_probe__syscall_entry_unknown(event_priv
->pub
, id
, args
);
150 static __always_inline
151 void syscall_entry_event_call_func(struct hlist_head
*action_list
,
152 void *func
, unsigned int nrargs
,
153 struct pt_regs
*regs
)
155 struct lttng_kernel_event_common_private
*event_priv
;
160 void (*fptr
)(void *__data
) = func
;
162 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
163 fptr(event_priv
->pub
);
168 void (*fptr
)(void *__data
, unsigned long arg0
) = func
;
169 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
171 lttng_syscall_get_arguments(current
, regs
, args
);
172 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
173 fptr(event_priv
->pub
, args
[0]);
178 void (*fptr
)(void *__data
,
180 unsigned long arg1
) = func
;
181 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
183 lttng_syscall_get_arguments(current
, regs
, args
);
184 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
185 fptr(event_priv
->pub
, args
[0], args
[1]);
190 void (*fptr
)(void *__data
,
193 unsigned long arg2
) = func
;
194 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
196 lttng_syscall_get_arguments(current
, regs
, args
);
197 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
198 fptr(event_priv
->pub
, args
[0], args
[1], args
[2]);
203 void (*fptr
)(void *__data
,
207 unsigned long arg3
) = func
;
208 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
210 lttng_syscall_get_arguments(current
, regs
, args
);
211 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
212 fptr(event_priv
->pub
, args
[0], args
[1], args
[2], args
[3]);
217 void (*fptr
)(void *__data
,
222 unsigned long arg4
) = func
;
223 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
225 lttng_syscall_get_arguments(current
, regs
, args
);
226 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
227 fptr(event_priv
->pub
, args
[0], args
[1], args
[2], args
[3], args
[4]);
232 void (*fptr
)(void *__data
,
238 unsigned long arg5
) = func
;
239 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
241 lttng_syscall_get_arguments(current
, regs
, args
);
242 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
243 fptr(event_priv
->pub
, args
[0], args
[1], args
[2],
244 args
[3], args
[4], args
[5]);
252 void syscall_entry_event_probe(void *__data
, struct pt_regs
*regs
, long id
)
254 struct lttng_kernel_syscall_table
*syscall_table
= __data
;
255 struct hlist_head
*action_list
, *unknown_action_list
;
256 const struct trace_syscall_entry
*table
, *entry
;
259 if (unlikely(in_compat_syscall())) {
260 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
262 if (id
< 0 || id
>= NR_compat_syscalls
263 || (!READ_ONCE(syscall_table
->syscall_all_entry
) && !test_bit(id
, filter
->sc_compat_entry
))) {
264 /* System call filtered out. */
267 table
= compat_sc_table
.table
;
268 table_len
= compat_sc_table
.len
;
269 unknown_action_list
= &syscall_table
->compat_unknown_syscall_dispatch
;
271 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
273 if (id
< 0 || id
>= NR_syscalls
274 || (!READ_ONCE(syscall_table
->syscall_all_entry
) && !test_bit(id
, filter
->sc_entry
))) {
275 /* System call filtered out. */
278 table
= sc_table
.table
;
279 table_len
= sc_table
.len
;
280 unknown_action_list
= &syscall_table
->unknown_syscall_dispatch
;
282 if (unlikely(id
< 0 || id
>= table_len
)) {
283 syscall_entry_event_unknown(unknown_action_list
, regs
, id
);
288 if (!entry
->event_func
) {
289 syscall_entry_event_unknown(unknown_action_list
, regs
, id
);
293 if (unlikely(in_compat_syscall())) {
294 action_list
= &syscall_table
->compat_syscall_dispatch
[id
];
296 action_list
= &syscall_table
->syscall_dispatch
[id
];
298 if (unlikely(hlist_empty(action_list
)))
301 syscall_entry_event_call_func(action_list
, entry
->event_func
, entry
->nrargs
, regs
);
304 static void syscall_exit_event_unknown(struct hlist_head
*unknown_action_list_head
,
305 struct pt_regs
*regs
, long id
, long ret
)
307 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
308 struct lttng_kernel_event_common_private
*event_priv
;
310 lttng_syscall_get_arguments(current
, regs
, args
);
311 lttng_hlist_for_each_entry_rcu(event_priv
, unknown_action_list_head
, u
.syscall
.node
) {
312 if (unlikely(in_compat_syscall()))
313 __event_probe__compat_syscall_exit_unknown(event_priv
->pub
, id
, ret
,
316 __event_probe__syscall_exit_unknown(event_priv
->pub
, id
, ret
, args
);
320 static __always_inline
321 void syscall_exit_event_call_func(struct hlist_head
*action_list
,
322 void *func
, unsigned int nrargs
,
323 struct pt_regs
*regs
, long ret
)
325 struct lttng_kernel_event_common_private
*event_priv
;
330 void (*fptr
)(void *__data
, long ret
) = func
;
332 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
333 fptr(event_priv
->pub
, ret
);
338 void (*fptr
)(void *__data
,
340 unsigned long arg0
) = func
;
341 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
343 lttng_syscall_get_arguments(current
, regs
, args
);
344 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
345 fptr(event_priv
->pub
, ret
, args
[0]);
350 void (*fptr
)(void *__data
,
353 unsigned long arg1
) = func
;
354 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
356 lttng_syscall_get_arguments(current
, regs
, args
);
357 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
358 fptr(event_priv
->pub
, ret
, args
[0], args
[1]);
363 void (*fptr
)(void *__data
,
367 unsigned long arg2
) = func
;
368 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
370 lttng_syscall_get_arguments(current
, regs
, args
);
371 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
372 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2]);
377 void (*fptr
)(void *__data
,
382 unsigned long arg3
) = func
;
383 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
385 lttng_syscall_get_arguments(current
, regs
, args
);
386 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
387 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2], args
[3]);
392 void (*fptr
)(void *__data
,
398 unsigned long arg4
) = func
;
399 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
401 lttng_syscall_get_arguments(current
, regs
, args
);
402 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
403 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2], args
[3], args
[4]);
408 void (*fptr
)(void *__data
,
415 unsigned long arg5
) = func
;
416 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
418 lttng_syscall_get_arguments(current
, regs
, args
);
419 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
420 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2],
421 args
[3], args
[4], args
[5]);
429 void syscall_exit_event_probe(void *__data
, struct pt_regs
*regs
, long ret
)
431 struct lttng_kernel_syscall_table
*syscall_table
= __data
;
432 struct hlist_head
*action_list
, *unknown_action_list
;
433 const struct trace_syscall_entry
*table
, *entry
;
437 id
= syscall_get_nr(current
, regs
);
439 if (unlikely(in_compat_syscall())) {
440 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
442 if (id
< 0 || id
>= NR_compat_syscalls
443 || (!READ_ONCE(syscall_table
->syscall_all_exit
) && !test_bit(id
, filter
->sc_compat_exit
))) {
444 /* System call filtered out. */
447 table
= compat_sc_exit_table
.table
;
448 table_len
= compat_sc_exit_table
.len
;
449 unknown_action_list
= &syscall_table
->compat_unknown_syscall_exit_dispatch
;
451 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
453 if (id
< 0 || id
>= NR_syscalls
454 || (!READ_ONCE(syscall_table
->syscall_all_exit
) && !test_bit(id
, filter
->sc_exit
))) {
455 /* System call filtered out. */
458 table
= sc_exit_table
.table
;
459 table_len
= sc_exit_table
.len
;
460 unknown_action_list
= &syscall_table
->unknown_syscall_exit_dispatch
;
462 if (unlikely(id
< 0 || id
>= table_len
)) {
463 syscall_exit_event_unknown(unknown_action_list
, regs
, id
, ret
);
468 if (!entry
->event_func
) {
469 syscall_exit_event_unknown(unknown_action_list
, regs
, id
, ret
);
473 if (unlikely(in_compat_syscall())) {
474 action_list
= &syscall_table
->compat_syscall_exit_dispatch
[id
];
476 action_list
= &syscall_table
->syscall_exit_dispatch
[id
];
478 if (unlikely(hlist_empty(action_list
)))
481 syscall_exit_event_call_func(action_list
, entry
->event_func
, entry
->nrargs
,
486 struct lttng_kernel_syscall_table
*get_syscall_table_from_enabler(struct lttng_event_enabler_common
*event_enabler
)
488 switch (event_enabler
->enabler_type
) {
489 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
491 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
492 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
493 return &event_recorder_enabler
->chan
->priv
->parent
.syscall_table
;
495 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
497 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
498 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
499 return &event_notifier_enabler
->group
->syscall_table
;
507 struct lttng_kernel_syscall_table
*get_syscall_table_from_event(struct lttng_kernel_event_common
*event
)
509 switch (event
->type
) {
510 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
512 struct lttng_kernel_event_recorder
*event_recorder
=
513 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
514 return &event_recorder
->chan
->priv
->parent
.syscall_table
;
516 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
518 struct lttng_kernel_event_notifier
*event_notifier
=
519 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
520 return &event_notifier
->priv
->group
->syscall_table
;
528 * noinline to diminish caller stack size.
529 * Should be called with sessions lock held.
532 int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry
*table
, size_t table_len
,
533 struct hlist_head
*chan_table
, struct lttng_event_recorder_enabler
*syscall_event_enabler
,
536 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(&syscall_event_enabler
->parent
);
537 struct lttng_kernel_channel_buffer
*chan
= syscall_event_enabler
->chan
;
538 struct lttng_kernel_session
*session
= chan
->parent
.session
;
541 /* Allocate events for each syscall matching enabler, insert into table */
542 for (i
= 0; i
< table_len
; i
++) {
543 const struct lttng_kernel_event_desc
*desc
= table
[i
].desc
;
544 struct lttng_event_recorder_enabler
*event_enabler
;
545 struct lttng_kernel_abi_event ev
;
546 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
547 struct lttng_kernel_event_recorder
*event_recorder
;
548 struct hlist_head
*head
;
552 /* Unknown syscall */
555 if (lttng_desc_match_enabler(desc
,
556 lttng_event_recorder_enabler_as_enabler(syscall_event_enabler
)) <= 0)
559 * Check if already created.
561 head
= utils_borrow_hash_table_bucket(
562 session
->priv
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
564 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
565 if (event_recorder_priv
->parent
.desc
== desc
566 && get_syscall_table_from_event(event_recorder_priv
->parent
.pub
) == syscall_table
)
572 /* We need to create an event for this syscall/enabler. */
573 memset(&ev
, 0, sizeof(ev
));
576 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
577 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
580 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
581 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
583 case SC_TYPE_COMPAT_ENTRY
:
584 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
585 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
587 case SC_TYPE_COMPAT_EXIT
:
588 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
589 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
592 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1);
593 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
594 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
595 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
596 if (!event_enabler
) {
599 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
, desc
);
600 WARN_ON_ONCE(!event_recorder
);
601 lttng_event_enabler_destroy(&event_enabler
->parent
);
602 if (IS_ERR(event_recorder
)) {
604 * If something goes wrong in event registration
605 * after the first one, we have no choice but to
606 * leave the previous events in there, until
607 * deleted by session teardown.
609 return PTR_ERR(event_recorder
);
611 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &chan_table
[i
]);
617 * Should be called with sessions lock held.
619 int lttng_syscalls_register_event(struct lttng_event_recorder_enabler
*syscall_event_enabler
)
621 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(&syscall_event_enabler
->parent
);
622 struct lttng_kernel_abi_event ev
;
625 wrapper_vmalloc_sync_mappings();
627 if (!syscall_table
->syscall_dispatch
) {
628 /* create syscall table mapping syscall to events */
629 syscall_table
->syscall_dispatch
= kzalloc(sizeof(struct hlist_head
) * sc_table
.len
, GFP_KERNEL
);
630 if (!syscall_table
->syscall_dispatch
)
633 if (!syscall_table
->syscall_exit_dispatch
) {
634 /* create syscall table mapping syscall to events */
635 syscall_table
->syscall_exit_dispatch
= kzalloc(sizeof(struct hlist_head
) * sc_exit_table
.len
, GFP_KERNEL
);
636 if (!syscall_table
->syscall_exit_dispatch
)
642 if (!syscall_table
->compat_syscall_dispatch
) {
643 /* create syscall table mapping compat syscall to events */
644 syscall_table
->compat_syscall_dispatch
= kzalloc(sizeof(struct hlist_head
) * compat_sc_table
.len
, GFP_KERNEL
);
645 if (!syscall_table
->compat_syscall_dispatch
)
649 if (!syscall_table
->compat_syscall_exit_dispatch
) {
650 /* create syscall table mapping compat syscall to events */
651 syscall_table
->compat_syscall_exit_dispatch
= kzalloc(sizeof(struct hlist_head
) * compat_sc_exit_table
.len
, GFP_KERNEL
);
652 if (!syscall_table
->compat_syscall_exit_dispatch
)
656 if (hlist_empty(&syscall_table
->unknown_syscall_dispatch
)) {
657 const struct lttng_kernel_event_desc
*desc
=
658 &__event_desc___syscall_entry_unknown
;
659 struct lttng_kernel_event_recorder
*event_recorder
;
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_NATIVE
;
668 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, syscall_event_enabler
->chan
);
669 if (!event_enabler
) {
672 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
, desc
);
673 lttng_event_enabler_destroy(&event_enabler
->parent
);
674 WARN_ON_ONCE(!event_recorder
);
675 if (IS_ERR(event_recorder
)) {
676 return PTR_ERR(event_recorder
);
678 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &syscall_table
->unknown_syscall_dispatch
);
681 if (hlist_empty(&syscall_table
->compat_unknown_syscall_dispatch
)) {
682 const struct lttng_kernel_event_desc
*desc
=
683 &__event_desc___compat_syscall_entry_unknown
;
684 struct lttng_kernel_event_recorder
*event_recorder
;
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_ENTRY
;
692 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
693 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, syscall_event_enabler
->chan
);
694 if (!event_enabler
) {
697 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
, desc
);
698 WARN_ON_ONCE(!event_recorder
);
699 lttng_event_enabler_destroy(&event_enabler
->parent
);
700 if (IS_ERR(event_recorder
)) {
701 return PTR_ERR(event_recorder
);
703 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &syscall_table
->compat_unknown_syscall_dispatch
);
706 if (hlist_empty(&syscall_table
->compat_unknown_syscall_exit_dispatch
)) {
707 const struct lttng_kernel_event_desc
*desc
=
708 &__event_desc___compat_syscall_exit_unknown
;
709 struct lttng_kernel_event_recorder
*event_recorder
;
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_COMPAT
;
718 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, syscall_event_enabler
->chan
);
719 if (!event_enabler
) {
722 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
, desc
);
723 WARN_ON_ONCE(!event_recorder
);
724 lttng_event_enabler_destroy(&event_enabler
->parent
);
725 if (IS_ERR(event_recorder
)) {
726 return PTR_ERR(event_recorder
);
728 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &syscall_table
->compat_unknown_syscall_exit_dispatch
);
731 if (hlist_empty(&syscall_table
->unknown_syscall_exit_dispatch
)) {
732 const struct lttng_kernel_event_desc
*desc
=
733 &__event_desc___syscall_exit_unknown
;
734 struct lttng_kernel_event_recorder
*event_recorder
;
735 struct lttng_event_recorder_enabler
*event_enabler
;
737 memset(&ev
, 0, sizeof(ev
));
738 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
739 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
740 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
741 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
742 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
743 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, syscall_event_enabler
->chan
);
744 if (!event_enabler
) {
747 event_recorder
= _lttng_kernel_event_recorder_create(event_enabler
, desc
);
748 WARN_ON_ONCE(!event_recorder
);
749 lttng_event_enabler_destroy(&event_enabler
->parent
);
750 if (IS_ERR(event_recorder
)) {
751 return PTR_ERR(event_recorder
);
753 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &syscall_table
->unknown_syscall_exit_dispatch
);
756 ret
= lttng_create_syscall_event_if_missing(sc_table
.table
, sc_table
.len
,
757 syscall_table
->syscall_dispatch
, syscall_event_enabler
, SC_TYPE_ENTRY
);
760 ret
= lttng_create_syscall_event_if_missing(sc_exit_table
.table
, sc_exit_table
.len
,
761 syscall_table
->syscall_exit_dispatch
, syscall_event_enabler
, SC_TYPE_EXIT
);
766 ret
= lttng_create_syscall_event_if_missing(compat_sc_table
.table
, compat_sc_table
.len
,
767 syscall_table
->compat_syscall_dispatch
, syscall_event_enabler
, SC_TYPE_COMPAT_ENTRY
);
770 ret
= lttng_create_syscall_event_if_missing(compat_sc_exit_table
.table
, compat_sc_exit_table
.len
,
771 syscall_table
->compat_syscall_exit_dispatch
, syscall_event_enabler
, SC_TYPE_COMPAT_EXIT
);
776 if (!syscall_table
->sc_filter
) {
777 syscall_table
->sc_filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
779 if (!syscall_table
->sc_filter
)
783 if (!syscall_table
->sys_enter_registered
) {
784 ret
= lttng_wrapper_tracepoint_probe_register("sys_enter",
785 (void *) syscall_entry_event_probe
, syscall_table
);
788 syscall_table
->sys_enter_registered
= 1;
791 * We change the name of sys_exit tracepoint due to namespace
792 * conflict with sys_exit syscall entry.
794 if (!syscall_table
->sys_exit_registered
) {
795 ret
= lttng_wrapper_tracepoint_probe_register("sys_exit",
796 (void *) syscall_exit_event_probe
, syscall_table
);
798 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
799 (void *) syscall_entry_event_probe
, syscall_table
));
802 syscall_table
->sys_exit_registered
= 1;
808 * Should be called with sessions lock held.
810 int lttng_syscalls_register_event_notifier(
811 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
813 struct lttng_event_notifier_group
*group
= event_notifier_enabler
->group
;
814 struct lttng_kernel_syscall_table
*syscall_table
= &group
->syscall_table
;
817 wrapper_vmalloc_sync_mappings();
819 if (!syscall_table
->syscall_dispatch
) {
820 syscall_table
->syscall_dispatch
= kzalloc(sizeof(struct hlist_head
) * sc_table
.len
, GFP_KERNEL
);
821 if (!syscall_table
->syscall_dispatch
)
825 if (!syscall_table
->syscall_exit_dispatch
) {
826 syscall_table
->syscall_exit_dispatch
= kzalloc(sizeof(struct hlist_head
) * sc_table
.len
, GFP_KERNEL
);
827 if (!syscall_table
->syscall_exit_dispatch
)
832 if (!syscall_table
->compat_syscall_dispatch
) {
833 syscall_table
->compat_syscall_dispatch
= kzalloc(sizeof(struct hlist_head
) * compat_sc_table
.len
, GFP_KERNEL
);
834 if (!syscall_table
->compat_syscall_dispatch
)
838 if (!syscall_table
->compat_syscall_exit_dispatch
) {
839 syscall_table
->compat_syscall_exit_dispatch
=
840 kzalloc(sizeof(struct hlist_head
) * compat_sc_exit_table
.len
,
842 if (!syscall_table
->compat_syscall_exit_dispatch
)
847 if (!syscall_table
->sc_filter
) {
848 syscall_table
->sc_filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
850 if (!syscall_table
->sc_filter
)
854 if (!syscall_table
->sys_enter_registered
) {
855 ret
= lttng_wrapper_tracepoint_probe_register("sys_enter",
856 (void *) syscall_entry_event_probe
, syscall_table
);
859 syscall_table
->sys_enter_registered
= 1;
862 if (!syscall_table
->sys_exit_registered
) {
863 ret
= lttng_wrapper_tracepoint_probe_register("sys_exit",
864 (void *) syscall_exit_event_probe
, syscall_table
);
866 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
867 (void *) syscall_entry_event_probe
, syscall_table
));
870 syscall_table
->sys_exit_registered
= 1;
877 int create_unknown_event_notifier(
878 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
881 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
882 struct lttng_kernel_event_notifier
*event_notifier
;
883 const struct lttng_kernel_event_desc
*desc
;
884 struct lttng_event_notifier_group
*group
= event_notifier_enabler
->group
;
885 struct lttng_kernel_syscall_table
*syscall_table
= &group
->syscall_table
;
886 struct lttng_kernel_abi_event_notifier event_notifier_param
;
887 uint64_t user_token
= event_notifier_enabler
->parent
.user_token
;
888 uint64_t error_counter_index
= event_notifier_enabler
->error_counter_index
;
889 struct lttng_event_enabler_common
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
890 event_notifier_enabler
);
891 struct hlist_head
*unknown_dispatch_list
;
894 enum lttng_kernel_abi_syscall_abi abi
;
895 enum lttng_kernel_abi_syscall_entryexit entryexit
;
896 struct hlist_head
*head
;
900 desc
= &__event_desc___syscall_entry_unknown
;
901 unknown_dispatch_list
= &syscall_table
->unknown_syscall_dispatch
;
902 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
903 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
906 desc
= &__event_desc___syscall_exit_unknown
;
907 unknown_dispatch_list
= &syscall_table
->unknown_syscall_exit_dispatch
;
908 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
909 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
911 case SC_TYPE_COMPAT_ENTRY
:
912 desc
= &__event_desc___compat_syscall_entry_unknown
;
913 unknown_dispatch_list
= &syscall_table
->compat_unknown_syscall_dispatch
;
914 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
915 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
917 case SC_TYPE_COMPAT_EXIT
:
918 desc
= &__event_desc___compat_syscall_exit_unknown
;
919 unknown_dispatch_list
= &syscall_table
->compat_unknown_syscall_exit_dispatch
;
920 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
921 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
928 * Check if already created.
930 head
= utils_borrow_hash_table_bucket(group
->event_notifiers_ht
.table
,
931 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
932 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
933 if (event_notifier_priv
->parent
.desc
== desc
&&
934 event_notifier_priv
->parent
.user_token
== base_enabler
->user_token
)
940 memset(&event_notifier_param
, 0, sizeof(event_notifier_param
));
941 strncat(event_notifier_param
.event
.name
, desc
->event_name
,
942 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- strlen(event_notifier_param
.event
.name
) - 1);
944 event_notifier_param
.event
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
946 event_notifier_param
.event
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
947 event_notifier_param
.event
.u
.syscall
.abi
= abi
;
948 event_notifier_param
.event
.u
.syscall
.entryexit
= entryexit
;
950 event_notifier
= _lttng_event_notifier_create(desc
, user_token
,
951 error_counter_index
, group
, &event_notifier_param
,
952 event_notifier_param
.event
.instrumentation
);
953 if (IS_ERR(event_notifier
)) {
954 printk(KERN_INFO
"Unable to create unknown notifier %s\n",
960 hlist_add_head_rcu(&event_notifier
->priv
->parent
.u
.syscall
.node
, unknown_dispatch_list
);
966 static int create_matching_event_notifiers(
967 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
968 const struct trace_syscall_entry
*table
,
969 size_t table_len
, enum sc_type type
)
971 struct lttng_event_notifier_group
*group
= event_notifier_enabler
->group
;
972 const struct lttng_kernel_event_desc
*desc
;
973 uint64_t user_token
= event_notifier_enabler
->parent
.user_token
;
974 uint64_t error_counter_index
= event_notifier_enabler
->error_counter_index
;
978 /* iterate over all syscall and create event_notifier that match */
979 for (i
= 0; i
< table_len
; i
++) {
980 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
981 struct lttng_kernel_event_notifier
*event_notifier
;
982 struct lttng_kernel_abi_event_notifier event_notifier_param
;
983 struct hlist_head
*head
;
986 desc
= table
[i
].desc
;
988 /* Unknown syscall */
992 if (!lttng_desc_match_enabler(desc
,
993 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
997 * Check if already created.
999 head
= utils_borrow_hash_table_bucket(group
->event_notifiers_ht
.table
,
1000 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
1001 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1002 if (event_notifier_priv
->parent
.desc
== desc
1003 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->parent
.user_token
)
1009 memset(&event_notifier_param
, 0, sizeof(event_notifier_param
));
1012 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
1013 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
1016 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
1017 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
1019 case SC_TYPE_COMPAT_ENTRY
:
1020 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
1021 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
1023 case SC_TYPE_COMPAT_EXIT
:
1024 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
1025 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
1028 strncat(event_notifier_param
.event
.name
, desc
->event_name
,
1029 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- strlen(event_notifier_param
.event
.name
) - 1);
1030 event_notifier_param
.event
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
1031 event_notifier_param
.event
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
1033 event_notifier
= _lttng_event_notifier_create(desc
, user_token
,
1034 error_counter_index
, group
, &event_notifier_param
,
1035 event_notifier_param
.event
.instrumentation
);
1036 if (IS_ERR(event_notifier
)) {
1037 printk(KERN_INFO
"Unable to create event_notifier %s\n",
1043 event_notifier
->priv
->parent
.u
.syscall
.syscall_id
= i
;
1051 int lttng_syscalls_create_matching_event_notifiers(
1052 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1055 struct lttng_event_enabler_common
*base_enabler
=
1056 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
1057 enum lttng_kernel_abi_syscall_entryexit entryexit
=
1058 base_enabler
->event_param
.u
.syscall
.entryexit
;
1060 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
) {
1061 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1062 sc_table
.table
, sc_table
.len
, SC_TYPE_ENTRY
);
1066 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1067 compat_sc_table
.table
, compat_sc_table
.len
,
1068 SC_TYPE_COMPAT_ENTRY
);
1072 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1077 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1078 SC_TYPE_COMPAT_ENTRY
);
1083 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
) {
1084 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1085 sc_exit_table
.table
, sc_exit_table
.len
,
1090 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1095 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1096 compat_sc_exit_table
.table
, compat_sc_exit_table
.len
,
1097 SC_TYPE_COMPAT_EXIT
);
1101 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1102 SC_TYPE_COMPAT_EXIT
);
1111 int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table
*syscall_table
)
1115 if (!syscall_table
->syscall_dispatch
)
1117 if (syscall_table
->sys_enter_registered
) {
1118 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_enter",
1119 (void *) syscall_entry_event_probe
, syscall_table
);
1122 syscall_table
->sys_enter_registered
= 0;
1124 if (syscall_table
->sys_exit_registered
) {
1125 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_exit",
1126 (void *) syscall_exit_event_probe
, syscall_table
);
1129 syscall_table
->sys_exit_registered
= 0;
1134 int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table
*syscall_table
)
1136 kfree(syscall_table
->syscall_dispatch
);
1137 kfree(syscall_table
->syscall_exit_dispatch
);
1138 #ifdef CONFIG_COMPAT
1139 kfree(syscall_table
->compat_syscall_dispatch
);
1140 kfree(syscall_table
->compat_syscall_exit_dispatch
);
1142 kfree(syscall_table
->sc_filter
);
1147 int get_syscall_nr(const char *syscall_name
)
1149 int syscall_nr
= -1;
1152 for (i
= 0; i
< sc_table
.len
; i
++) {
1153 const struct trace_syscall_entry
*entry
;
1154 const char *it_name
;
1156 entry
= &sc_table
.table
[i
];
1159 it_name
= entry
->desc
->event_name
;
1160 it_name
+= strlen(SYSCALL_ENTRY_STR
);
1161 if (!strcmp(syscall_name
, it_name
)) {
1170 int get_compat_syscall_nr(const char *syscall_name
)
1172 int syscall_nr
= -1;
1175 for (i
= 0; i
< compat_sc_table
.len
; i
++) {
1176 const struct trace_syscall_entry
*entry
;
1177 const char *it_name
;
1179 entry
= &compat_sc_table
.table
[i
];
1182 it_name
= entry
->desc
->event_name
;
1183 it_name
+= strlen(COMPAT_SYSCALL_ENTRY_STR
);
1184 if (!strcmp(syscall_name
, it_name
)) {
1193 uint32_t get_sc_tables_len(void)
1195 return sc_table
.len
+ compat_sc_table
.len
;
1199 const char *get_syscall_name(const char *desc_name
,
1200 enum lttng_syscall_abi abi
,
1201 enum lttng_syscall_entryexit entryexit
)
1203 size_t prefix_len
= 0;
1206 switch (entryexit
) {
1207 case LTTNG_SYSCALL_ENTRY
:
1209 case LTTNG_SYSCALL_ABI_NATIVE
:
1210 prefix_len
= strlen(SYSCALL_ENTRY_STR
);
1212 case LTTNG_SYSCALL_ABI_COMPAT
:
1213 prefix_len
= strlen(COMPAT_SYSCALL_ENTRY_STR
);
1217 case LTTNG_SYSCALL_EXIT
:
1219 case LTTNG_SYSCALL_ABI_NATIVE
:
1220 prefix_len
= strlen(SYSCALL_EXIT_STR
);
1222 case LTTNG_SYSCALL_ABI_COMPAT
:
1223 prefix_len
= strlen(COMPAT_SYSCALL_EXIT_STR
);
1228 WARN_ON_ONCE(prefix_len
== 0);
1229 return desc_name
+ prefix_len
;
1233 int lttng_syscall_filter_enable(
1234 struct lttng_syscall_filter
*filter
,
1235 const char *desc_name
, enum lttng_syscall_abi abi
,
1236 enum lttng_syscall_entryexit entryexit
)
1238 const char *syscall_name
;
1239 unsigned long *bitmap
;
1242 syscall_name
= get_syscall_name(desc_name
, abi
, entryexit
);
1245 case LTTNG_SYSCALL_ABI_NATIVE
:
1246 syscall_nr
= get_syscall_nr(syscall_name
);
1248 case LTTNG_SYSCALL_ABI_COMPAT
:
1249 syscall_nr
= get_compat_syscall_nr(syscall_name
);
1257 switch (entryexit
) {
1258 case LTTNG_SYSCALL_ENTRY
:
1260 case LTTNG_SYSCALL_ABI_NATIVE
:
1261 bitmap
= filter
->sc_entry
;
1263 case LTTNG_SYSCALL_ABI_COMPAT
:
1264 bitmap
= filter
->sc_compat_entry
;
1270 case LTTNG_SYSCALL_EXIT
:
1272 case LTTNG_SYSCALL_ABI_NATIVE
:
1273 bitmap
= filter
->sc_exit
;
1275 case LTTNG_SYSCALL_ABI_COMPAT
:
1276 bitmap
= filter
->sc_compat_exit
;
1285 if (test_bit(syscall_nr
, bitmap
))
1287 bitmap_set(bitmap
, syscall_nr
, 1);
1291 int lttng_syscall_filter_enable_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1293 struct lttng_event_notifier_group
*group
= event_notifier
->priv
->group
;
1294 struct lttng_kernel_syscall_table
*syscall_table
= &group
->syscall_table
;
1295 unsigned int syscall_id
= event_notifier
->priv
->parent
.u
.syscall
.syscall_id
;
1296 struct hlist_head
*dispatch_list
;
1299 WARN_ON_ONCE(event_notifier
->priv
->parent
.instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
);
1301 ret
= lttng_syscall_filter_enable(syscall_table
->sc_filter
,
1302 event_notifier
->priv
->parent
.desc
->event_name
,
1303 event_notifier
->priv
->parent
.u
.syscall
.abi
,
1304 event_notifier
->priv
->parent
.u
.syscall
.entryexit
);
1309 switch (event_notifier
->priv
->parent
.u
.syscall
.entryexit
) {
1310 case LTTNG_SYSCALL_ENTRY
:
1311 switch (event_notifier
->priv
->parent
.u
.syscall
.abi
) {
1312 case LTTNG_SYSCALL_ABI_NATIVE
:
1313 dispatch_list
= &syscall_table
->syscall_dispatch
[syscall_id
];
1315 case LTTNG_SYSCALL_ABI_COMPAT
:
1316 dispatch_list
= &syscall_table
->compat_syscall_dispatch
[syscall_id
];
1323 case LTTNG_SYSCALL_EXIT
:
1324 switch (event_notifier
->priv
->parent
.u
.syscall
.abi
) {
1325 case LTTNG_SYSCALL_ABI_NATIVE
:
1326 dispatch_list
= &syscall_table
->syscall_exit_dispatch
[syscall_id
];
1328 case LTTNG_SYSCALL_ABI_COMPAT
:
1329 dispatch_list
= &syscall_table
->compat_syscall_exit_dispatch
[syscall_id
];
1341 hlist_add_head_rcu(&event_notifier
->priv
->parent
.u
.syscall
.node
, dispatch_list
);
1347 int lttng_syscall_filter_enable_event_recorder(struct lttng_kernel_event_recorder
*event_recorder
)
1349 struct lttng_kernel_channel_buffer
*channel
= event_recorder
->chan
;
1350 struct lttng_kernel_syscall_table
*syscall_table
= &channel
->priv
->parent
.syscall_table
;
1352 WARN_ON_ONCE(event_recorder
->priv
->parent
.instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
);
1354 return lttng_syscall_filter_enable(syscall_table
->sc_filter
,
1355 event_recorder
->priv
->parent
.desc
->event_name
,
1356 event_recorder
->priv
->parent
.u
.syscall
.abi
,
1357 event_recorder
->priv
->parent
.u
.syscall
.entryexit
);
1361 int lttng_syscall_filter_disable(struct lttng_syscall_filter
*filter
,
1362 const char *desc_name
, enum lttng_syscall_abi abi
,
1363 enum lttng_syscall_entryexit entryexit
)
1365 const char *syscall_name
;
1366 unsigned long *bitmap
;
1369 syscall_name
= get_syscall_name(desc_name
, abi
, entryexit
);
1372 case LTTNG_SYSCALL_ABI_NATIVE
:
1373 syscall_nr
= get_syscall_nr(syscall_name
);
1375 case LTTNG_SYSCALL_ABI_COMPAT
:
1376 syscall_nr
= get_compat_syscall_nr(syscall_name
);
1384 switch (entryexit
) {
1385 case LTTNG_SYSCALL_ENTRY
:
1387 case LTTNG_SYSCALL_ABI_NATIVE
:
1388 bitmap
= filter
->sc_entry
;
1390 case LTTNG_SYSCALL_ABI_COMPAT
:
1391 bitmap
= filter
->sc_compat_entry
;
1397 case LTTNG_SYSCALL_EXIT
:
1399 case LTTNG_SYSCALL_ABI_NATIVE
:
1400 bitmap
= filter
->sc_exit
;
1402 case LTTNG_SYSCALL_ABI_COMPAT
:
1403 bitmap
= filter
->sc_compat_exit
;
1412 if (!test_bit(syscall_nr
, bitmap
))
1414 bitmap_clear(bitmap
, syscall_nr
, 1);
1419 int lttng_syscall_filter_disable_event_notifier(struct lttng_kernel_event_notifier
*event_notifier
)
1421 struct lttng_event_notifier_group
*group
= event_notifier
->priv
->group
;
1422 struct lttng_kernel_syscall_table
*syscall_table
= &group
->syscall_table
;
1425 WARN_ON_ONCE(event_notifier
->priv
->parent
.instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
);
1427 ret
= lttng_syscall_filter_disable(syscall_table
->sc_filter
,
1428 event_notifier
->priv
->parent
.desc
->event_name
,
1429 event_notifier
->priv
->parent
.u
.syscall
.abi
,
1430 event_notifier
->priv
->parent
.u
.syscall
.entryexit
);
1431 WARN_ON_ONCE(ret
!= 0);
1433 hlist_del_rcu(&event_notifier
->priv
->parent
.u
.syscall
.node
);
1437 int lttng_syscall_filter_disable_event_recorder(struct lttng_kernel_event_recorder
*event_recorder
)
1439 struct lttng_kernel_channel_buffer
*channel
= event_recorder
->chan
;
1440 struct lttng_kernel_syscall_table
*syscall_table
= &channel
->priv
->parent
.syscall_table
;
1442 return lttng_syscall_filter_disable(syscall_table
->sc_filter
,
1443 event_recorder
->priv
->parent
.desc
->event_name
,
1444 event_recorder
->priv
->parent
.u
.syscall
.abi
,
1445 event_recorder
->priv
->parent
.u
.syscall
.entryexit
);
1449 const struct trace_syscall_entry
*syscall_list_get_entry(loff_t
*pos
)
1451 const struct trace_syscall_entry
*entry
;
1454 for (entry
= sc_table
.table
;
1455 entry
< sc_table
.table
+ sc_table
.len
;
1460 for (entry
= compat_sc_table
.table
;
1461 entry
< compat_sc_table
.table
+ compat_sc_table
.len
;
1471 void *syscall_list_start(struct seq_file
*m
, loff_t
*pos
)
1473 return (void *) syscall_list_get_entry(pos
);
1477 void *syscall_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1480 return (void *) syscall_list_get_entry(ppos
);
1484 void syscall_list_stop(struct seq_file
*m
, void *p
)
1489 int get_sc_table(const struct trace_syscall_entry
*entry
,
1490 const struct trace_syscall_entry
**table
,
1491 unsigned int *bitness
)
1493 if (entry
>= sc_table
.table
&& entry
< sc_table
.table
+ sc_table
.len
) {
1495 *bitness
= BITS_PER_LONG
;
1497 *table
= sc_table
.table
;
1500 if (!(entry
>= compat_sc_table
.table
1501 && entry
< compat_sc_table
.table
+ compat_sc_table
.len
)) {
1507 *table
= compat_sc_table
.table
;
1512 int syscall_list_show(struct seq_file
*m
, void *p
)
1514 const struct trace_syscall_entry
*table
, *entry
= p
;
1515 unsigned int bitness
;
1516 unsigned long index
;
1520 ret
= get_sc_table(entry
, &table
, &bitness
);
1525 if (table
== sc_table
.table
) {
1526 index
= entry
- table
;
1527 name
= &entry
->desc
->event_name
[strlen(SYSCALL_ENTRY_STR
)];
1529 index
= (entry
- table
) + sc_table
.len
;
1530 name
= &entry
->desc
->event_name
[strlen(COMPAT_SYSCALL_ENTRY_STR
)];
1532 seq_printf(m
, "syscall { index = %lu; name = %s; bitness = %u; };\n",
1533 index
, name
, bitness
);
1538 const struct seq_operations lttng_syscall_list_seq_ops
= {
1539 .start
= syscall_list_start
,
1540 .next
= syscall_list_next
,
1541 .stop
= syscall_list_stop
,
1542 .show
= syscall_list_show
,
1546 int lttng_syscall_list_open(struct inode
*inode
, struct file
*file
)
1548 return seq_open(file
, <tng_syscall_list_seq_ops
);
1551 const struct file_operations lttng_syscall_list_fops
= {
1552 .owner
= THIS_MODULE
,
1553 .open
= lttng_syscall_list_open
,
1555 .llseek
= seq_lseek
,
1556 .release
= seq_release
,
1560 * A syscall is enabled if it is traced for either entry or exit.
1562 long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer
*channel
,
1563 struct lttng_kernel_abi_syscall_mask __user
*usyscall_mask
)
1565 struct lttng_kernel_syscall_table
*syscall_table
= &channel
->priv
->parent
.syscall_table
;
1566 uint32_t len
, sc_tables_len
, bitmask_len
;
1569 struct lttng_syscall_filter
*filter
;
1571 ret
= get_user(len
, &usyscall_mask
->len
);
1574 sc_tables_len
= get_sc_tables_len();
1575 bitmask_len
= ALIGN(sc_tables_len
, 8) >> 3;
1576 if (len
< sc_tables_len
) {
1577 return put_user(sc_tables_len
, &usyscall_mask
->len
);
1579 /* Array is large enough, we can copy array to user-space. */
1580 tmp_mask
= kzalloc(bitmask_len
, GFP_KERNEL
);
1583 filter
= syscall_table
->sc_filter
;
1585 for (bit
= 0; bit
< sc_table
.len
; bit
++) {
1588 if (syscall_table
->syscall_dispatch
) {
1589 if (!(READ_ONCE(syscall_table
->syscall_all_entry
)
1590 || READ_ONCE(syscall_table
->syscall_all_exit
)) && filter
)
1591 state
= test_bit(bit
, filter
->sc_entry
)
1592 || test_bit(bit
, filter
->sc_exit
);
1598 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1600 for (; bit
< sc_tables_len
; bit
++) {
1603 if (syscall_table
->compat_syscall_dispatch
) {
1604 if (!(READ_ONCE(syscall_table
->syscall_all_entry
)
1605 || READ_ONCE(syscall_table
->syscall_all_exit
)) && filter
)
1606 state
= test_bit(bit
- sc_table
.len
,
1607 filter
->sc_compat_entry
)
1608 || test_bit(bit
- sc_table
.len
,
1609 filter
->sc_compat_exit
);
1615 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1617 if (copy_to_user(usyscall_mask
->mask
, tmp_mask
, bitmask_len
))
1623 int lttng_abi_syscall_list(void)
1625 struct file
*syscall_list_file
;
1628 file_fd
= lttng_get_unused_fd();
1634 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
1635 <tng_syscall_list_fops
,
1637 if (IS_ERR(syscall_list_file
)) {
1638 ret
= PTR_ERR(syscall_list_file
);
1641 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
1644 fd_install(file_fd
, syscall_list_file
);
1648 fput(syscall_list_file
);
1650 put_unused_fd(file_fd
);