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
);
68 void syscall_entry_event_notifier_probe(void *__data
, struct pt_regs
*regs
,
70 void syscall_exit_event_notifier_probe(void *__data
, struct pt_regs
*regs
,
74 * Forward declarations for old kernels.
78 struct oldold_utsname
;
80 struct sel_arg_struct
;
81 struct mmap_arg_struct
;
86 * Forward declaration for kernels >= 5.6
93 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
94 typedef __kernel_old_time_t
time_t;
97 #ifdef IA32_NR_syscalls
98 #define NR_compat_syscalls IA32_NR_syscalls
100 #define NR_compat_syscalls NR_syscalls
104 * Create LTTng tracepoint probes.
106 #define LTTNG_PACKAGE_BUILD
107 #define CREATE_TRACE_POINTS
108 #define TP_MODULE_NOINIT
109 #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers
111 #define PARAMS(args...) args
113 /* Handle unknown syscalls */
115 #define TRACE_SYSTEM syscalls_unknown
116 #include <instrumentation/syscalls/headers/syscalls_unknown.h>
121 extern const struct trace_syscall_table sc_table
;
122 extern const struct trace_syscall_table compat_sc_table
;
124 /* Event syscall exit table */
125 extern const struct trace_syscall_table sc_exit_table
;
126 extern const struct trace_syscall_table compat_sc_exit_table
;
131 #undef CREATE_SYSCALL_TABLE
133 struct lttng_syscall_filter
{
134 DECLARE_BITMAP(sc_entry
, NR_syscalls
);
135 DECLARE_BITMAP(sc_exit
, NR_syscalls
);
136 DECLARE_BITMAP(sc_compat_entry
, NR_compat_syscalls
);
137 DECLARE_BITMAP(sc_compat_exit
, NR_compat_syscalls
);
140 static void syscall_entry_event_unknown(struct hlist_head
*unknown_action_list_head
,
141 struct pt_regs
*regs
, long id
)
143 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
144 struct lttng_kernel_event_common_private
*event_priv
;
146 lttng_syscall_get_arguments(current
, regs
, args
);
147 lttng_hlist_for_each_entry_rcu(event_priv
, unknown_action_list_head
, u
.syscall
.node
) {
148 if (unlikely(in_compat_syscall()))
149 __event_probe__compat_syscall_entry_unknown(event_priv
->pub
, id
, args
);
151 __event_probe__syscall_entry_unknown(event_priv
->pub
, id
, args
);
155 static __always_inline
156 void syscall_entry_event_call_func(struct hlist_head
*action_list
,
157 void *func
, unsigned int nrargs
,
158 struct pt_regs
*regs
)
160 struct lttng_kernel_event_common_private
*event_priv
;
165 void (*fptr
)(void *__data
) = func
;
167 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
168 fptr(event_priv
->pub
);
173 void (*fptr
)(void *__data
, unsigned long arg0
) = func
;
174 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
176 lttng_syscall_get_arguments(current
, regs
, args
);
177 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
178 fptr(event_priv
->pub
, args
[0]);
183 void (*fptr
)(void *__data
,
185 unsigned long arg1
) = func
;
186 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
188 lttng_syscall_get_arguments(current
, regs
, args
);
189 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
190 fptr(event_priv
->pub
, args
[0], args
[1]);
195 void (*fptr
)(void *__data
,
198 unsigned long arg2
) = func
;
199 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
201 lttng_syscall_get_arguments(current
, regs
, args
);
202 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
203 fptr(event_priv
->pub
, args
[0], args
[1], args
[2]);
208 void (*fptr
)(void *__data
,
212 unsigned long arg3
) = func
;
213 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
215 lttng_syscall_get_arguments(current
, regs
, args
);
216 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
217 fptr(event_priv
->pub
, args
[0], args
[1], args
[2], args
[3]);
222 void (*fptr
)(void *__data
,
227 unsigned long arg4
) = func
;
228 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
230 lttng_syscall_get_arguments(current
, regs
, args
);
231 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
232 fptr(event_priv
->pub
, args
[0], args
[1], args
[2], args
[3], args
[4]);
237 void (*fptr
)(void *__data
,
243 unsigned long arg5
) = func
;
244 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
246 lttng_syscall_get_arguments(current
, regs
, args
);
247 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
248 fptr(event_priv
->pub
, args
[0], args
[1], args
[2],
249 args
[3], args
[4], args
[5]);
257 void syscall_entry_event_probe(void *__data
, struct pt_regs
*regs
, long id
)
259 struct lttng_kernel_channel_buffer
*chan
= __data
;
260 struct hlist_head
*action_list
, *unknown_action_list
;
261 const struct trace_syscall_entry
*table
, *entry
;
264 if (unlikely(in_compat_syscall())) {
265 struct lttng_syscall_filter
*filter
= chan
->priv
->parent
.sc_filter
;
267 if (id
< 0 || id
>= NR_compat_syscalls
268 || (!READ_ONCE(chan
->priv
->parent
.syscall_all_entry
) && !test_bit(id
, filter
->sc_compat_entry
))) {
269 /* System call filtered out. */
272 table
= compat_sc_table
.table
;
273 table_len
= compat_sc_table
.len
;
274 unknown_action_list
= &chan
->priv
->parent
.sc_compat_unknown
;
276 struct lttng_syscall_filter
*filter
= chan
->priv
->parent
.sc_filter
;
278 if (id
< 0 || id
>= NR_syscalls
279 || (!READ_ONCE(chan
->priv
->parent
.syscall_all_entry
) && !test_bit(id
, filter
->sc_entry
))) {
280 /* System call filtered out. */
283 table
= sc_table
.table
;
284 table_len
= sc_table
.len
;
285 unknown_action_list
= &chan
->priv
->parent
.sc_unknown
;
287 if (unlikely(id
< 0 || id
>= table_len
)) {
288 syscall_entry_event_unknown(unknown_action_list
, regs
, id
);
293 if (!entry
->event_func
) {
294 syscall_entry_event_unknown(unknown_action_list
, regs
, id
);
298 if (unlikely(in_compat_syscall())) {
299 action_list
= &chan
->priv
->parent
.compat_sc_table
[id
];
301 action_list
= &chan
->priv
->parent
.sc_table
[id
];
303 if (unlikely(hlist_empty(action_list
)))
306 syscall_entry_event_call_func(action_list
, entry
->event_func
, entry
->nrargs
, regs
);
309 void syscall_entry_event_notifier_probe(void *__data
, struct pt_regs
*regs
,
312 struct lttng_event_notifier_group
*group
= __data
;
313 const struct trace_syscall_entry
*table
, *entry
;
314 struct hlist_head
*dispatch_list
, *unknown_dispatch_list
;
317 if (unlikely(in_compat_syscall())) {
318 struct lttng_syscall_filter
*filter
= group
->sc_filter
;
320 if (id
< 0 || id
>= NR_compat_syscalls
321 || (!READ_ONCE(group
->syscall_all_entry
) &&
322 !test_bit(id
, filter
->sc_compat_entry
))) {
323 /* System call filtered out. */
326 table
= compat_sc_table
.table
;
327 table_len
= compat_sc_table
.len
;
328 unknown_dispatch_list
= &group
->event_notifier_compat_unknown_syscall_dispatch
;
330 struct lttng_syscall_filter
*filter
= group
->sc_filter
;
332 if (id
< 0 || id
>= NR_syscalls
333 || (!READ_ONCE(group
->syscall_all_entry
) &&
334 !test_bit(id
, filter
->sc_entry
))) {
335 /* System call filtered out. */
338 table
= sc_table
.table
;
339 table_len
= sc_table
.len
;
340 unknown_dispatch_list
= &group
->event_notifier_unknown_syscall_dispatch
;
342 /* Check if the syscall id is out of bound. */
343 if (unlikely(id
< 0 || id
>= table_len
)) {
344 syscall_entry_event_unknown(unknown_dispatch_list
,
350 if (!entry
->event_func
) {
351 syscall_entry_event_unknown(unknown_dispatch_list
,
356 if (unlikely(in_compat_syscall())) {
357 dispatch_list
= &group
->event_notifier_compat_syscall_dispatch
[id
];
359 dispatch_list
= &group
->event_notifier_syscall_dispatch
[id
];
361 if (unlikely(hlist_empty(dispatch_list
)))
364 syscall_entry_event_call_func(dispatch_list
,
365 entry
->event_func
, entry
->nrargs
, regs
);
368 static void syscall_exit_event_unknown(struct hlist_head
*unknown_action_list_head
,
369 struct pt_regs
*regs
, long id
, long ret
)
371 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
372 struct lttng_kernel_event_common_private
*event_priv
;
374 lttng_syscall_get_arguments(current
, regs
, args
);
375 lttng_hlist_for_each_entry_rcu(event_priv
, unknown_action_list_head
, u
.syscall
.node
) {
376 if (unlikely(in_compat_syscall()))
377 __event_probe__compat_syscall_exit_unknown(event_priv
->pub
, id
, ret
,
380 __event_probe__syscall_exit_unknown(event_priv
->pub
, id
, ret
, args
);
384 static __always_inline
385 void syscall_exit_event_call_func(struct hlist_head
*action_list
,
386 void *func
, unsigned int nrargs
,
387 struct pt_regs
*regs
, long ret
)
389 struct lttng_kernel_event_common_private
*event_priv
;
394 void (*fptr
)(void *__data
, long ret
) = func
;
396 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
397 fptr(event_priv
->pub
, ret
);
402 void (*fptr
)(void *__data
,
404 unsigned long arg0
) = func
;
405 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
407 lttng_syscall_get_arguments(current
, regs
, args
);
408 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
409 fptr(event_priv
->pub
, ret
, args
[0]);
414 void (*fptr
)(void *__data
,
417 unsigned long arg1
) = func
;
418 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
420 lttng_syscall_get_arguments(current
, regs
, args
);
421 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
422 fptr(event_priv
->pub
, ret
, args
[0], args
[1]);
427 void (*fptr
)(void *__data
,
431 unsigned long arg2
) = func
;
432 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
434 lttng_syscall_get_arguments(current
, regs
, args
);
435 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
436 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2]);
441 void (*fptr
)(void *__data
,
446 unsigned long arg3
) = func
;
447 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
449 lttng_syscall_get_arguments(current
, regs
, args
);
450 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
451 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2], args
[3]);
456 void (*fptr
)(void *__data
,
462 unsigned long arg4
) = func
;
463 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
465 lttng_syscall_get_arguments(current
, regs
, args
);
466 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
467 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2], args
[3], args
[4]);
472 void (*fptr
)(void *__data
,
479 unsigned long arg5
) = func
;
480 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
482 lttng_syscall_get_arguments(current
, regs
, args
);
483 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
484 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2],
485 args
[3], args
[4], args
[5]);
493 void syscall_exit_event_probe(void *__data
, struct pt_regs
*regs
, long ret
)
495 struct lttng_kernel_channel_buffer
*chan
= __data
;
496 struct hlist_head
*action_list
, *unknown_action_list
;
497 const struct trace_syscall_entry
*table
, *entry
;
501 id
= syscall_get_nr(current
, regs
);
503 if (unlikely(in_compat_syscall())) {
504 struct lttng_syscall_filter
*filter
= chan
->priv
->parent
.sc_filter
;
506 if (id
< 0 || id
>= NR_compat_syscalls
507 || (!READ_ONCE(chan
->priv
->parent
.syscall_all_exit
) && !test_bit(id
, filter
->sc_compat_exit
))) {
508 /* System call filtered out. */
511 table
= compat_sc_exit_table
.table
;
512 table_len
= compat_sc_exit_table
.len
;
513 unknown_action_list
= &chan
->priv
->parent
.compat_sc_exit_unknown
;
515 struct lttng_syscall_filter
*filter
= chan
->priv
->parent
.sc_filter
;
517 if (id
< 0 || id
>= NR_syscalls
518 || (!READ_ONCE(chan
->priv
->parent
.syscall_all_exit
) && !test_bit(id
, filter
->sc_exit
))) {
519 /* System call filtered out. */
522 table
= sc_exit_table
.table
;
523 table_len
= sc_exit_table
.len
;
524 unknown_action_list
= &chan
->priv
->parent
.sc_exit_unknown
;
526 if (unlikely(id
< 0 || id
>= table_len
)) {
527 syscall_exit_event_unknown(unknown_action_list
, regs
, id
, ret
);
532 if (!entry
->event_func
) {
533 syscall_exit_event_unknown(unknown_action_list
, regs
, id
, ret
);
537 if (unlikely(in_compat_syscall())) {
538 action_list
= &chan
->priv
->parent
.compat_sc_exit_table
[id
];
540 action_list
= &chan
->priv
->parent
.sc_exit_table
[id
];
542 if (unlikely(hlist_empty(action_list
)))
545 syscall_exit_event_call_func(action_list
, entry
->event_func
, entry
->nrargs
,
549 void syscall_exit_event_notifier_probe(void *__data
, struct pt_regs
*regs
,
552 struct lttng_event_notifier_group
*group
= __data
;
553 const struct trace_syscall_entry
*table
, *entry
;
554 struct hlist_head
*dispatch_list
, *unknown_dispatch_list
;
558 id
= syscall_get_nr(current
, regs
);
560 if (unlikely(in_compat_syscall())) {
561 struct lttng_syscall_filter
*filter
= group
->sc_filter
;
563 if (id
< 0 || id
>= NR_compat_syscalls
564 || (!READ_ONCE(group
->syscall_all_exit
) &&
565 !test_bit(id
, filter
->sc_compat_exit
))) {
566 /* System call filtered out. */
569 table
= compat_sc_exit_table
.table
;
570 table_len
= compat_sc_exit_table
.len
;
571 unknown_dispatch_list
= &group
->event_notifier_exit_compat_unknown_syscall_dispatch
;
573 struct lttng_syscall_filter
*filter
= group
->sc_filter
;
575 if (id
< 0 || id
>= NR_syscalls
576 || (!READ_ONCE(group
->syscall_all_exit
) &&
577 !test_bit(id
, filter
->sc_exit
))) {
578 /* System call filtered out. */
581 table
= sc_exit_table
.table
;
582 table_len
= sc_exit_table
.len
;
583 unknown_dispatch_list
= &group
->event_notifier_exit_unknown_syscall_dispatch
;
585 /* Check if the syscall id is out of bound. */
586 if (unlikely(id
< 0 || id
>= table_len
)) {
587 syscall_exit_event_unknown(unknown_dispatch_list
,
593 if (!entry
->event_func
) {
594 syscall_entry_event_unknown(unknown_dispatch_list
,
599 if (unlikely(in_compat_syscall())) {
600 dispatch_list
= &group
->event_notifier_exit_compat_syscall_dispatch
[id
];
602 dispatch_list
= &group
->event_notifier_exit_syscall_dispatch
[id
];
604 if (unlikely(hlist_empty(dispatch_list
)))
607 syscall_exit_event_call_func(dispatch_list
,
608 entry
->event_func
, entry
->nrargs
, regs
, ret
);
611 * noinline to diminish caller stack size.
612 * Should be called with sessions lock held.
615 int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry
*table
, size_t table_len
,
616 struct hlist_head
*chan_table
, struct lttng_event_enabler
*event_enabler
,
619 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
620 struct lttng_kernel_session
*session
= chan
->parent
.session
;
623 /* Allocate events for each syscall matching enabler, insert into table */
624 for (i
= 0; i
< table_len
; i
++) {
625 const struct lttng_kernel_event_desc
*desc
= table
[i
].desc
;
626 struct lttng_kernel_abi_event ev
;
627 struct lttng_kernel_event_recorder_private
*event_recorder_priv
;
628 struct lttng_kernel_event_recorder
*event_recorder
;
629 struct hlist_head
*head
;
633 /* Unknown syscall */
636 if (lttng_desc_match_enabler(desc
,
637 lttng_event_enabler_as_enabler(event_enabler
)) <= 0)
640 * Check if already created.
642 head
= utils_borrow_hash_table_bucket(
643 session
->priv
->events_ht
.table
, LTTNG_EVENT_HT_SIZE
,
645 lttng_hlist_for_each_entry(event_recorder_priv
, head
, hlist
) {
646 if (event_recorder_priv
->parent
.desc
== desc
647 && event_recorder_priv
->pub
->chan
== event_enabler
->chan
)
653 /* We need to create an event for this syscall/enabler. */
654 memset(&ev
, 0, sizeof(ev
));
657 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
658 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
661 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
662 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
664 case SC_TYPE_COMPAT_ENTRY
:
665 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
666 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
668 case SC_TYPE_COMPAT_EXIT
:
669 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
670 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
673 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1);
674 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
675 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
676 event_recorder
= _lttng_kernel_event_recorder_create(chan
, &ev
, desc
, ev
.instrumentation
);
677 WARN_ON_ONCE(!event_recorder
);
678 if (IS_ERR(event_recorder
)) {
680 * If something goes wrong in event registration
681 * after the first one, we have no choice but to
682 * leave the previous events in there, until
683 * deleted by session teardown.
685 return PTR_ERR(event_recorder
);
687 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &chan_table
[i
]);
693 * Should be called with sessions lock held.
695 int lttng_syscalls_register_event(struct lttng_event_enabler
*event_enabler
)
697 struct lttng_kernel_channel_buffer
*chan
= event_enabler
->chan
;
698 struct lttng_kernel_abi_event ev
;
701 wrapper_vmalloc_sync_mappings();
703 if (!chan
->priv
->parent
.sc_table
) {
704 /* create syscall table mapping syscall to events */
705 chan
->priv
->parent
.sc_table
= kzalloc(sizeof(struct lttng_kernel_event_recorder
*)
706 * sc_table
.len
, GFP_KERNEL
);
707 if (!chan
->priv
->parent
.sc_table
)
710 if (!chan
->priv
->parent
.sc_exit_table
) {
711 /* create syscall table mapping syscall to events */
712 chan
->priv
->parent
.sc_exit_table
= kzalloc(sizeof(struct lttng_kernel_event_recorder
*)
713 * sc_exit_table
.len
, GFP_KERNEL
);
714 if (!chan
->priv
->parent
.sc_exit_table
)
720 if (!chan
->priv
->parent
.compat_sc_table
) {
721 /* create syscall table mapping compat syscall to events */
722 chan
->priv
->parent
.compat_sc_table
= kzalloc(sizeof(struct lttng_kernel_event_recorder
*)
723 * compat_sc_table
.len
, GFP_KERNEL
);
724 if (!chan
->priv
->parent
.compat_sc_table
)
728 if (!chan
->priv
->parent
.compat_sc_exit_table
) {
729 /* create syscall table mapping compat syscall to events */
730 chan
->priv
->parent
.compat_sc_exit_table
= kzalloc(sizeof(struct lttng_kernel_event_recorder
*)
731 * compat_sc_exit_table
.len
, GFP_KERNEL
);
732 if (!chan
->priv
->parent
.compat_sc_exit_table
)
736 if (hlist_empty(&chan
->priv
->parent
.sc_unknown
)) {
737 const struct lttng_kernel_event_desc
*desc
=
738 &__event_desc___syscall_entry_unknown
;
739 struct lttng_kernel_event_recorder
*event_recorder
;
741 memset(&ev
, 0, sizeof(ev
));
742 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
743 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
744 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
745 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
746 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
747 event_recorder
= _lttng_kernel_event_recorder_create(chan
, &ev
, desc
,
749 WARN_ON_ONCE(!event_recorder
);
750 if (IS_ERR(event_recorder
)) {
751 return PTR_ERR(event_recorder
);
753 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &chan
->priv
->parent
.sc_unknown
);
756 if (hlist_empty(&chan
->priv
->parent
.sc_compat_unknown
)) {
757 const struct lttng_kernel_event_desc
*desc
=
758 &__event_desc___compat_syscall_entry_unknown
;
759 struct lttng_kernel_event_recorder
*event_recorder
;
761 memset(&ev
, 0, sizeof(ev
));
762 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
763 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
764 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
765 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
766 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
767 event_recorder
= _lttng_kernel_event_recorder_create(chan
, &ev
, desc
,
769 WARN_ON_ONCE(!event_recorder
);
770 if (IS_ERR(event_recorder
)) {
771 return PTR_ERR(event_recorder
);
773 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &chan
->priv
->parent
.sc_compat_unknown
);
776 if (hlist_empty(&chan
->priv
->parent
.compat_sc_exit_unknown
)) {
777 const struct lttng_kernel_event_desc
*desc
=
778 &__event_desc___compat_syscall_exit_unknown
;
779 struct lttng_kernel_event_recorder
*event_recorder
;
781 memset(&ev
, 0, sizeof(ev
));
782 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
783 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
784 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
785 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
786 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
787 event_recorder
= _lttng_kernel_event_recorder_create(chan
, &ev
, desc
,
789 WARN_ON_ONCE(!event_recorder
);
790 if (IS_ERR(event_recorder
)) {
791 return PTR_ERR(event_recorder
);
793 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &chan
->priv
->parent
.compat_sc_exit_unknown
);
796 if (hlist_empty(&chan
->priv
->parent
.sc_exit_unknown
)) {
797 const struct lttng_kernel_event_desc
*desc
=
798 &__event_desc___syscall_exit_unknown
;
799 struct lttng_kernel_event_recorder
*event_recorder
;
801 memset(&ev
, 0, sizeof(ev
));
802 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
803 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
804 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
805 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
806 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
807 event_recorder
= _lttng_kernel_event_recorder_create(chan
, &ev
, desc
,
809 WARN_ON_ONCE(!event_recorder
);
810 if (IS_ERR(event_recorder
)) {
811 return PTR_ERR(event_recorder
);
813 hlist_add_head(&event_recorder
->priv
->parent
.u
.syscall
.node
, &chan
->priv
->parent
.sc_exit_unknown
);
816 ret
= lttng_create_syscall_event_if_missing(sc_table
.table
, sc_table
.len
,
817 chan
->priv
->parent
.sc_table
, event_enabler
, SC_TYPE_ENTRY
);
820 ret
= lttng_create_syscall_event_if_missing(sc_exit_table
.table
, sc_exit_table
.len
,
821 chan
->priv
->parent
.sc_exit_table
, event_enabler
, SC_TYPE_EXIT
);
826 ret
= lttng_create_syscall_event_if_missing(compat_sc_table
.table
, compat_sc_table
.len
,
827 chan
->priv
->parent
.compat_sc_table
, event_enabler
, SC_TYPE_COMPAT_ENTRY
);
830 ret
= lttng_create_syscall_event_if_missing(compat_sc_exit_table
.table
, compat_sc_exit_table
.len
,
831 chan
->priv
->parent
.compat_sc_exit_table
, event_enabler
, SC_TYPE_COMPAT_EXIT
);
836 if (!chan
->priv
->parent
.sc_filter
) {
837 chan
->priv
->parent
.sc_filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
839 if (!chan
->priv
->parent
.sc_filter
)
843 if (!chan
->priv
->parent
.sys_enter_registered
) {
844 ret
= lttng_wrapper_tracepoint_probe_register("sys_enter",
845 (void *) syscall_entry_event_probe
, chan
);
848 chan
->priv
->parent
.sys_enter_registered
= 1;
851 * We change the name of sys_exit tracepoint due to namespace
852 * conflict with sys_exit syscall entry.
854 if (!chan
->priv
->parent
.sys_exit_registered
) {
855 ret
= lttng_wrapper_tracepoint_probe_register("sys_exit",
856 (void *) syscall_exit_event_probe
, chan
);
858 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
859 (void *) syscall_entry_event_probe
, chan
));
862 chan
->priv
->parent
.sys_exit_registered
= 1;
868 * Should be called with sessions lock held.
870 int lttng_syscalls_register_event_notifier(
871 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
873 struct lttng_event_notifier_group
*group
= event_notifier_enabler
->group
;
877 wrapper_vmalloc_sync_mappings();
879 if (!group
->event_notifier_syscall_dispatch
) {
880 group
->event_notifier_syscall_dispatch
=
881 kzalloc(sizeof(struct hlist_head
) * sc_table
.len
,
883 if (!group
->event_notifier_syscall_dispatch
)
886 /* Initialize all list_head */
887 for (i
= 0; i
< sc_table
.len
; i
++)
888 INIT_HLIST_HEAD(&group
->event_notifier_syscall_dispatch
[i
]);
890 /* Init the unknown syscall notifier list. */
891 INIT_HLIST_HEAD(&group
->event_notifier_unknown_syscall_dispatch
);
894 if (!group
->event_notifier_exit_syscall_dispatch
) {
895 group
->event_notifier_exit_syscall_dispatch
=
896 kzalloc(sizeof(struct hlist_head
) * sc_table
.len
,
898 if (!group
->event_notifier_exit_syscall_dispatch
)
901 /* Initialize all list_head */
902 for (i
= 0; i
< sc_table
.len
; i
++)
903 INIT_HLIST_HEAD(&group
->event_notifier_exit_syscall_dispatch
[i
]);
905 /* Init the unknown exit syscall notifier list. */
906 INIT_HLIST_HEAD(&group
->event_notifier_exit_unknown_syscall_dispatch
);
910 if (!group
->event_notifier_compat_syscall_dispatch
) {
911 group
->event_notifier_compat_syscall_dispatch
=
912 kzalloc(sizeof(struct hlist_head
) * compat_sc_table
.len
,
914 if (!group
->event_notifier_syscall_dispatch
)
917 /* Initialize all list_head */
918 for (i
= 0; i
< compat_sc_table
.len
; i
++)
919 INIT_HLIST_HEAD(&group
->event_notifier_compat_syscall_dispatch
[i
]);
921 /* Init the unknown syscall notifier list. */
922 INIT_HLIST_HEAD(&group
->event_notifier_compat_unknown_syscall_dispatch
);
925 if (!group
->event_notifier_exit_compat_syscall_dispatch
) {
926 group
->event_notifier_exit_compat_syscall_dispatch
=
927 kzalloc(sizeof(struct hlist_head
) * compat_sc_exit_table
.len
,
929 if (!group
->event_notifier_exit_syscall_dispatch
)
932 /* Initialize all list_head */
933 for (i
= 0; i
< compat_sc_exit_table
.len
; i
++)
934 INIT_HLIST_HEAD(&group
->event_notifier_exit_compat_syscall_dispatch
[i
]);
936 /* Init the unknown exit syscall notifier list. */
937 INIT_HLIST_HEAD(&group
->event_notifier_exit_compat_unknown_syscall_dispatch
);
941 if (!group
->sc_filter
) {
942 group
->sc_filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
944 if (!group
->sc_filter
)
948 if (!group
->sys_enter_registered
) {
949 ret
= lttng_wrapper_tracepoint_probe_register("sys_enter",
950 (void *) syscall_entry_event_notifier_probe
, group
);
953 group
->sys_enter_registered
= 1;
956 if (!group
->sys_exit_registered
) {
957 ret
= lttng_wrapper_tracepoint_probe_register("sys_exit",
958 (void *) syscall_exit_event_notifier_probe
, group
);
960 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
961 (void *) syscall_entry_event_notifier_probe
, group
));
964 group
->sys_exit_registered
= 1;
971 int create_unknown_event_notifier(
972 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
975 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
976 struct lttng_kernel_event_notifier
*event_notifier
;
977 const struct lttng_kernel_event_desc
*desc
;
978 struct lttng_event_notifier_group
*group
= event_notifier_enabler
->group
;
979 struct lttng_kernel_abi_event_notifier event_notifier_param
;
980 uint64_t user_token
= event_notifier_enabler
->base
.user_token
;
981 uint64_t error_counter_index
= event_notifier_enabler
->error_counter_index
;
982 struct lttng_enabler
*base_enabler
= lttng_event_notifier_enabler_as_enabler(
983 event_notifier_enabler
);
984 struct hlist_head
*unknown_dispatch_list
;
987 enum lttng_kernel_abi_syscall_abi abi
;
988 enum lttng_kernel_abi_syscall_entryexit entryexit
;
989 struct hlist_head
*head
;
993 desc
= &__event_desc___syscall_entry_unknown
;
994 unknown_dispatch_list
= &group
->event_notifier_unknown_syscall_dispatch
;
995 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
996 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
999 desc
= &__event_desc___syscall_exit_unknown
;
1000 unknown_dispatch_list
= &group
->event_notifier_exit_unknown_syscall_dispatch
;
1001 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
1002 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
1004 case SC_TYPE_COMPAT_ENTRY
:
1005 desc
= &__event_desc___compat_syscall_entry_unknown
;
1006 unknown_dispatch_list
= &group
->event_notifier_compat_unknown_syscall_dispatch
;
1007 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
1008 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
1010 case SC_TYPE_COMPAT_EXIT
:
1011 desc
= &__event_desc___compat_syscall_exit_unknown
;
1012 unknown_dispatch_list
= &group
->event_notifier_exit_compat_unknown_syscall_dispatch
;
1013 entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
1014 abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
1021 * Check if already created.
1023 head
= utils_borrow_hash_table_bucket(group
->event_notifiers_ht
.table
,
1024 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
1025 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1026 if (event_notifier_priv
->parent
.desc
== desc
&&
1027 event_notifier_priv
->parent
.user_token
== base_enabler
->user_token
)
1033 memset(&event_notifier_param
, 0, sizeof(event_notifier_param
));
1034 strncat(event_notifier_param
.event
.name
, desc
->event_name
,
1035 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- strlen(event_notifier_param
.event
.name
) - 1);
1037 event_notifier_param
.event
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
1039 event_notifier_param
.event
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
1040 event_notifier_param
.event
.u
.syscall
.abi
= abi
;
1041 event_notifier_param
.event
.u
.syscall
.entryexit
= entryexit
;
1043 event_notifier
= _lttng_event_notifier_create(desc
, user_token
,
1044 error_counter_index
, group
, &event_notifier_param
,
1045 event_notifier_param
.event
.instrumentation
);
1046 if (IS_ERR(event_notifier
)) {
1047 printk(KERN_INFO
"Unable to create unknown notifier %s\n",
1053 hlist_add_head_rcu(&event_notifier
->priv
->parent
.u
.syscall
.node
, unknown_dispatch_list
);
1059 static int create_matching_event_notifiers(
1060 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1061 const struct trace_syscall_entry
*table
,
1062 size_t table_len
, enum sc_type type
)
1064 struct lttng_event_notifier_group
*group
= event_notifier_enabler
->group
;
1065 const struct lttng_kernel_event_desc
*desc
;
1066 uint64_t user_token
= event_notifier_enabler
->base
.user_token
;
1067 uint64_t error_counter_index
= event_notifier_enabler
->error_counter_index
;
1071 /* iterate over all syscall and create event_notifier that match */
1072 for (i
= 0; i
< table_len
; i
++) {
1073 struct lttng_kernel_event_notifier_private
*event_notifier_priv
;
1074 struct lttng_kernel_event_notifier
*event_notifier
;
1075 struct lttng_kernel_abi_event_notifier event_notifier_param
;
1076 struct hlist_head
*head
;
1079 desc
= table
[i
].desc
;
1081 /* Unknown syscall */
1085 if (!lttng_desc_match_enabler(desc
,
1086 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1090 * Check if already created.
1092 head
= utils_borrow_hash_table_bucket(group
->event_notifiers_ht
.table
,
1093 LTTNG_EVENT_NOTIFIER_HT_SIZE
, desc
->event_name
);
1094 lttng_hlist_for_each_entry(event_notifier_priv
, head
, hlist
) {
1095 if (event_notifier_priv
->parent
.desc
== desc
1096 && event_notifier_priv
->parent
.user_token
== event_notifier_enabler
->base
.user_token
)
1102 memset(&event_notifier_param
, 0, sizeof(event_notifier_param
));
1105 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
1106 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
1109 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
1110 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
1112 case SC_TYPE_COMPAT_ENTRY
:
1113 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
1114 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
1116 case SC_TYPE_COMPAT_EXIT
:
1117 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
1118 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
1121 strncat(event_notifier_param
.event
.name
, desc
->event_name
,
1122 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- strlen(event_notifier_param
.event
.name
) - 1);
1123 event_notifier_param
.event
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
1124 event_notifier_param
.event
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
1126 event_notifier
= _lttng_event_notifier_create(desc
, user_token
,
1127 error_counter_index
, group
, &event_notifier_param
,
1128 event_notifier_param
.event
.instrumentation
);
1129 if (IS_ERR(event_notifier
)) {
1130 printk(KERN_INFO
"Unable to create event_notifier %s\n",
1136 event_notifier
->priv
->parent
.u
.syscall
.syscall_id
= i
;
1144 int lttng_syscalls_create_matching_event_notifiers(
1145 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1148 struct lttng_enabler
*base_enabler
=
1149 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
);
1150 enum lttng_kernel_abi_syscall_entryexit entryexit
=
1151 base_enabler
->event_param
.u
.syscall
.entryexit
;
1153 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
) {
1154 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1155 sc_table
.table
, sc_table
.len
, SC_TYPE_ENTRY
);
1159 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1160 compat_sc_table
.table
, compat_sc_table
.len
,
1161 SC_TYPE_COMPAT_ENTRY
);
1165 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1170 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1171 SC_TYPE_COMPAT_ENTRY
);
1176 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
) {
1177 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1178 sc_exit_table
.table
, sc_exit_table
.len
,
1183 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1188 ret
= create_matching_event_notifiers(event_notifier_enabler
,
1189 compat_sc_exit_table
.table
, compat_sc_exit_table
.len
,
1190 SC_TYPE_COMPAT_EXIT
);
1194 ret
= create_unknown_event_notifier(event_notifier_enabler
,
1195 SC_TYPE_COMPAT_EXIT
);
1205 * Unregister the syscall event_notifier probes from the callsites.
1207 int lttng_syscalls_unregister_event_notifier_group(
1208 struct lttng_event_notifier_group
*event_notifier_group
)
1213 * Only register the event_notifier probe on the `sys_enter` callsite for now.
1214 * At the moment, we don't think it's desirable to have one fired
1215 * event_notifier for the entry and one for the exit of a syscall.
1217 if (event_notifier_group
->sys_enter_registered
) {
1218 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_enter",
1219 (void *) syscall_entry_event_notifier_probe
, event_notifier_group
);
1222 event_notifier_group
->sys_enter_registered
= 0;
1224 if (event_notifier_group
->sys_exit_registered
) {
1225 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_exit",
1226 (void *) syscall_exit_event_notifier_probe
, event_notifier_group
);
1229 event_notifier_group
->sys_enter_registered
= 0;
1232 kfree(event_notifier_group
->event_notifier_syscall_dispatch
);
1233 kfree(event_notifier_group
->event_notifier_exit_syscall_dispatch
);
1234 #ifdef CONFIG_COMPAT
1235 kfree(event_notifier_group
->event_notifier_compat_syscall_dispatch
);
1236 kfree(event_notifier_group
->event_notifier_exit_compat_syscall_dispatch
);
1241 int lttng_syscalls_unregister_channel(struct lttng_kernel_channel_buffer
*chan
)
1245 if (!chan
->priv
->parent
.sc_table
)
1247 if (chan
->priv
->parent
.sys_enter_registered
) {
1248 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_enter",
1249 (void *) syscall_entry_event_probe
, chan
);
1252 chan
->priv
->parent
.sys_enter_registered
= 0;
1254 if (chan
->priv
->parent
.sys_exit_registered
) {
1255 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_exit",
1256 (void *) syscall_exit_event_probe
, chan
);
1259 chan
->priv
->parent
.sys_exit_registered
= 0;
1264 int lttng_syscalls_destroy_event(struct lttng_kernel_channel_buffer
*chan
)
1266 kfree(chan
->priv
->parent
.sc_table
);
1267 kfree(chan
->priv
->parent
.sc_exit_table
);
1268 #ifdef CONFIG_COMPAT
1269 kfree(chan
->priv
->parent
.compat_sc_table
);
1270 kfree(chan
->priv
->parent
.compat_sc_exit_table
);
1272 kfree(chan
->priv
->parent
.sc_filter
);
1277 int get_syscall_nr(const char *syscall_name
)
1279 int syscall_nr
= -1;
1282 for (i
= 0; i
< sc_table
.len
; i
++) {
1283 const struct trace_syscall_entry
*entry
;
1284 const char *it_name
;
1286 entry
= &sc_table
.table
[i
];
1289 it_name
= entry
->desc
->event_name
;
1290 it_name
+= strlen(SYSCALL_ENTRY_STR
);
1291 if (!strcmp(syscall_name
, it_name
)) {
1300 int get_compat_syscall_nr(const char *syscall_name
)
1302 int syscall_nr
= -1;
1305 for (i
= 0; i
< compat_sc_table
.len
; i
++) {
1306 const struct trace_syscall_entry
*entry
;
1307 const char *it_name
;
1309 entry
= &compat_sc_table
.table
[i
];
1312 it_name
= entry
->desc
->event_name
;
1313 it_name
+= strlen(COMPAT_SYSCALL_ENTRY_STR
);
1314 if (!strcmp(syscall_name
, it_name
)) {
1323 uint32_t get_sc_tables_len(void)
1325 return sc_table
.len
+ compat_sc_table
.len
;
1329 const char *get_syscall_name(const char *desc_name
,
1330 enum lttng_syscall_abi abi
,
1331 enum lttng_syscall_entryexit entryexit
)
1333 size_t prefix_len
= 0;
1336 switch (entryexit
) {
1337 case LTTNG_SYSCALL_ENTRY
:
1339 case LTTNG_SYSCALL_ABI_NATIVE
:
1340 prefix_len
= strlen(SYSCALL_ENTRY_STR
);
1342 case LTTNG_SYSCALL_ABI_COMPAT
:
1343 prefix_len
= strlen(COMPAT_SYSCALL_ENTRY_STR
);
1347 case LTTNG_SYSCALL_EXIT
:
1349 case LTTNG_SYSCALL_ABI_NATIVE
:
1350 prefix_len
= strlen(SYSCALL_EXIT_STR
);
1352 case LTTNG_SYSCALL_ABI_COMPAT
:
1353 prefix_len
= strlen(COMPAT_SYSCALL_EXIT_STR
);
1358 WARN_ON_ONCE(prefix_len
== 0);
1359 return desc_name
+ prefix_len
;
1363 int lttng_syscall_filter_enable(
1364 struct lttng_syscall_filter
*filter
,
1365 const char *desc_name
, enum lttng_syscall_abi abi
,
1366 enum lttng_syscall_entryexit entryexit
)
1368 const char *syscall_name
;
1369 unsigned long *bitmap
;
1372 syscall_name
= get_syscall_name(desc_name
, abi
, entryexit
);
1375 case LTTNG_SYSCALL_ABI_NATIVE
:
1376 syscall_nr
= get_syscall_nr(syscall_name
);
1378 case LTTNG_SYSCALL_ABI_COMPAT
:
1379 syscall_nr
= get_compat_syscall_nr(syscall_name
);
1387 switch (entryexit
) {
1388 case LTTNG_SYSCALL_ENTRY
:
1390 case LTTNG_SYSCALL_ABI_NATIVE
:
1391 bitmap
= filter
->sc_entry
;
1393 case LTTNG_SYSCALL_ABI_COMPAT
:
1394 bitmap
= filter
->sc_compat_entry
;
1400 case LTTNG_SYSCALL_EXIT
:
1402 case LTTNG_SYSCALL_ABI_NATIVE
:
1403 bitmap
= filter
->sc_exit
;
1405 case LTTNG_SYSCALL_ABI_COMPAT
:
1406 bitmap
= filter
->sc_compat_exit
;
1415 if (test_bit(syscall_nr
, bitmap
))
1417 bitmap_set(bitmap
, syscall_nr
, 1);
1421 int lttng_syscall_filter_enable_event_notifier(
1422 struct lttng_kernel_event_notifier
*event_notifier
)
1424 struct lttng_event_notifier_group
*group
= event_notifier
->priv
->group
;
1425 unsigned int syscall_id
= event_notifier
->priv
->parent
.u
.syscall
.syscall_id
;
1426 struct hlist_head
*dispatch_list
;
1429 WARN_ON_ONCE(event_notifier
->priv
->parent
.instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
);
1431 ret
= lttng_syscall_filter_enable(group
->sc_filter
,
1432 event_notifier
->priv
->parent
.desc
->event_name
,
1433 event_notifier
->priv
->parent
.u
.syscall
.abi
,
1434 event_notifier
->priv
->parent
.u
.syscall
.entryexit
);
1439 switch (event_notifier
->priv
->parent
.u
.syscall
.entryexit
) {
1440 case LTTNG_SYSCALL_ENTRY
:
1441 switch (event_notifier
->priv
->parent
.u
.syscall
.abi
) {
1442 case LTTNG_SYSCALL_ABI_NATIVE
:
1443 dispatch_list
= &group
->event_notifier_syscall_dispatch
[syscall_id
];
1445 case LTTNG_SYSCALL_ABI_COMPAT
:
1446 dispatch_list
= &group
->event_notifier_compat_syscall_dispatch
[syscall_id
];
1453 case LTTNG_SYSCALL_EXIT
:
1454 switch (event_notifier
->priv
->parent
.u
.syscall
.abi
) {
1455 case LTTNG_SYSCALL_ABI_NATIVE
:
1456 dispatch_list
= &group
->event_notifier_exit_syscall_dispatch
[syscall_id
];
1458 case LTTNG_SYSCALL_ABI_COMPAT
:
1459 dispatch_list
= &group
->event_notifier_exit_compat_syscall_dispatch
[syscall_id
];
1471 hlist_add_head_rcu(&event_notifier
->priv
->parent
.u
.syscall
.node
, dispatch_list
);
1477 int lttng_syscall_filter_enable_event(
1478 struct lttng_kernel_channel_buffer
*channel
,
1479 struct lttng_kernel_event_recorder
*event_recorder
)
1481 WARN_ON_ONCE(event_recorder
->priv
->parent
.instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
);
1483 return lttng_syscall_filter_enable(channel
->priv
->parent
.sc_filter
,
1484 event_recorder
->priv
->parent
.desc
->event_name
,
1485 event_recorder
->priv
->parent
.u
.syscall
.abi
,
1486 event_recorder
->priv
->parent
.u
.syscall
.entryexit
);
1490 int lttng_syscall_filter_disable(
1491 struct lttng_syscall_filter
*filter
,
1492 const char *desc_name
, enum lttng_syscall_abi abi
,
1493 enum lttng_syscall_entryexit entryexit
)
1495 const char *syscall_name
;
1496 unsigned long *bitmap
;
1499 syscall_name
= get_syscall_name(desc_name
, abi
, entryexit
);
1502 case LTTNG_SYSCALL_ABI_NATIVE
:
1503 syscall_nr
= get_syscall_nr(syscall_name
);
1505 case LTTNG_SYSCALL_ABI_COMPAT
:
1506 syscall_nr
= get_compat_syscall_nr(syscall_name
);
1514 switch (entryexit
) {
1515 case LTTNG_SYSCALL_ENTRY
:
1517 case LTTNG_SYSCALL_ABI_NATIVE
:
1518 bitmap
= filter
->sc_entry
;
1520 case LTTNG_SYSCALL_ABI_COMPAT
:
1521 bitmap
= filter
->sc_compat_entry
;
1527 case LTTNG_SYSCALL_EXIT
:
1529 case LTTNG_SYSCALL_ABI_NATIVE
:
1530 bitmap
= filter
->sc_exit
;
1532 case LTTNG_SYSCALL_ABI_COMPAT
:
1533 bitmap
= filter
->sc_compat_exit
;
1542 if (!test_bit(syscall_nr
, bitmap
))
1544 bitmap_clear(bitmap
, syscall_nr
, 1);
1549 int lttng_syscall_filter_disable_event_notifier(
1550 struct lttng_kernel_event_notifier
*event_notifier
)
1552 struct lttng_event_notifier_group
*group
= event_notifier
->priv
->group
;
1555 WARN_ON_ONCE(event_notifier
->priv
->parent
.instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
);
1557 ret
= lttng_syscall_filter_disable(group
->sc_filter
,
1558 event_notifier
->priv
->parent
.desc
->event_name
,
1559 event_notifier
->priv
->parent
.u
.syscall
.abi
,
1560 event_notifier
->priv
->parent
.u
.syscall
.entryexit
);
1561 WARN_ON_ONCE(ret
!= 0);
1563 hlist_del_rcu(&event_notifier
->priv
->parent
.u
.syscall
.node
);
1567 int lttng_syscall_filter_disable_event(
1568 struct lttng_kernel_channel_buffer
*channel
,
1569 struct lttng_kernel_event_recorder
*event_recorder
)
1571 return lttng_syscall_filter_disable(channel
->priv
->parent
.sc_filter
,
1572 event_recorder
->priv
->parent
.desc
->event_name
,
1573 event_recorder
->priv
->parent
.u
.syscall
.abi
,
1574 event_recorder
->priv
->parent
.u
.syscall
.entryexit
);
1578 const struct trace_syscall_entry
*syscall_list_get_entry(loff_t
*pos
)
1580 const struct trace_syscall_entry
*entry
;
1583 for (entry
= sc_table
.table
;
1584 entry
< sc_table
.table
+ sc_table
.len
;
1589 for (entry
= compat_sc_table
.table
;
1590 entry
< compat_sc_table
.table
+ compat_sc_table
.len
;
1600 void *syscall_list_start(struct seq_file
*m
, loff_t
*pos
)
1602 return (void *) syscall_list_get_entry(pos
);
1606 void *syscall_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1609 return (void *) syscall_list_get_entry(ppos
);
1613 void syscall_list_stop(struct seq_file
*m
, void *p
)
1618 int get_sc_table(const struct trace_syscall_entry
*entry
,
1619 const struct trace_syscall_entry
**table
,
1620 unsigned int *bitness
)
1622 if (entry
>= sc_table
.table
&& entry
< sc_table
.table
+ sc_table
.len
) {
1624 *bitness
= BITS_PER_LONG
;
1626 *table
= sc_table
.table
;
1629 if (!(entry
>= compat_sc_table
.table
1630 && entry
< compat_sc_table
.table
+ compat_sc_table
.len
)) {
1636 *table
= compat_sc_table
.table
;
1641 int syscall_list_show(struct seq_file
*m
, void *p
)
1643 const struct trace_syscall_entry
*table
, *entry
= p
;
1644 unsigned int bitness
;
1645 unsigned long index
;
1649 ret
= get_sc_table(entry
, &table
, &bitness
);
1654 if (table
== sc_table
.table
) {
1655 index
= entry
- table
;
1656 name
= &entry
->desc
->event_name
[strlen(SYSCALL_ENTRY_STR
)];
1658 index
= (entry
- table
) + sc_table
.len
;
1659 name
= &entry
->desc
->event_name
[strlen(COMPAT_SYSCALL_ENTRY_STR
)];
1661 seq_printf(m
, "syscall { index = %lu; name = %s; bitness = %u; };\n",
1662 index
, name
, bitness
);
1667 const struct seq_operations lttng_syscall_list_seq_ops
= {
1668 .start
= syscall_list_start
,
1669 .next
= syscall_list_next
,
1670 .stop
= syscall_list_stop
,
1671 .show
= syscall_list_show
,
1675 int lttng_syscall_list_open(struct inode
*inode
, struct file
*file
)
1677 return seq_open(file
, <tng_syscall_list_seq_ops
);
1680 const struct file_operations lttng_syscall_list_fops
= {
1681 .owner
= THIS_MODULE
,
1682 .open
= lttng_syscall_list_open
,
1684 .llseek
= seq_lseek
,
1685 .release
= seq_release
,
1689 * A syscall is enabled if it is traced for either entry or exit.
1691 long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer
*channel
,
1692 struct lttng_kernel_abi_syscall_mask __user
*usyscall_mask
)
1694 uint32_t len
, sc_tables_len
, bitmask_len
;
1697 struct lttng_syscall_filter
*filter
;
1699 ret
= get_user(len
, &usyscall_mask
->len
);
1702 sc_tables_len
= get_sc_tables_len();
1703 bitmask_len
= ALIGN(sc_tables_len
, 8) >> 3;
1704 if (len
< sc_tables_len
) {
1705 return put_user(sc_tables_len
, &usyscall_mask
->len
);
1707 /* Array is large enough, we can copy array to user-space. */
1708 tmp_mask
= kzalloc(bitmask_len
, GFP_KERNEL
);
1711 filter
= channel
->priv
->parent
.sc_filter
;
1713 for (bit
= 0; bit
< sc_table
.len
; bit
++) {
1716 if (channel
->priv
->parent
.sc_table
) {
1717 if (!(READ_ONCE(channel
->priv
->parent
.syscall_all_entry
)
1718 || READ_ONCE(channel
->priv
->parent
.syscall_all_exit
)) && filter
)
1719 state
= test_bit(bit
, filter
->sc_entry
)
1720 || test_bit(bit
, filter
->sc_exit
);
1726 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1728 for (; bit
< sc_tables_len
; bit
++) {
1731 if (channel
->priv
->parent
.compat_sc_table
) {
1732 if (!(READ_ONCE(channel
->priv
->parent
.syscall_all_entry
)
1733 || READ_ONCE(channel
->priv
->parent
.syscall_all_exit
)) && filter
)
1734 state
= test_bit(bit
- sc_table
.len
,
1735 filter
->sc_compat_entry
)
1736 || test_bit(bit
- sc_table
.len
,
1737 filter
->sc_compat_exit
);
1743 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1745 if (copy_to_user(usyscall_mask
->mask
, tmp_mask
, bitmask_len
))
1751 int lttng_abi_syscall_list(void)
1753 struct file
*syscall_list_file
;
1756 file_fd
= lttng_get_unused_fd();
1762 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
1763 <tng_syscall_list_fops
,
1765 if (IS_ERR(syscall_list_file
)) {
1766 ret
= PTR_ERR(syscall_list_file
);
1769 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
1772 fd_install(file_fd
, syscall_list_file
);
1776 fput(syscall_list_file
);
1778 put_unused_fd(file_fd
);