1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * LTTng syscall probes.
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/compat.h>
13 #include <linux/err.h>
14 #include <linux/bitmap.h>
16 #include <linux/in6.h>
17 #include <linux/seq_file.h>
18 #include <linux/stringify.h>
19 #include <linux/file.h>
20 #include <linux/anon_inodes.h>
21 #include <linux/fcntl.h>
22 #include <linux/mman.h>
23 #include <asm/ptrace.h>
24 #include <asm/syscall.h>
26 #include <lttng/bitfield.h>
27 #include <wrapper/tracepoint.h>
28 #include <wrapper/file.h>
29 #include <wrapper/rcu.h>
30 #include <wrapper/syscall.h>
31 #include <lttng/events.h>
32 #include <lttng/events-internal.h>
33 #include <lttng/utils.h>
35 #include "lttng-syscalls.h"
38 # ifndef is_compat_task
39 # define is_compat_task() (0)
43 /* in_compat_syscall appears in kernel 4.6. */
44 #ifndef in_compat_syscall
45 #define in_compat_syscall() is_compat_task()
55 #define SYSCALL_ENTRY_TOK syscall_entry_
56 #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_
57 #define SYSCALL_EXIT_TOK syscall_exit_
58 #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_
60 #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK)
61 #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK)
62 #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK)
63 #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK)
65 void syscall_entry_event_probe(void *__data
, struct pt_regs
*regs
, long id
);
66 void syscall_exit_event_probe(void *__data
, struct pt_regs
*regs
, long ret
);
69 * Forward declarations for old kernels.
73 struct oldold_utsname
;
75 struct sel_arg_struct
;
76 struct mmap_arg_struct
;
81 * Forward declaration for kernels >= 5.6
88 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
89 typedef __kernel_old_time_t
time_t;
92 #ifdef IA32_NR_syscalls
93 #define NR_compat_syscalls IA32_NR_syscalls
95 #define NR_compat_syscalls NR_syscalls
99 * Create LTTng tracepoint probes.
101 #define LTTNG_PACKAGE_BUILD
102 #define CREATE_TRACE_POINTS
103 #define TP_MODULE_NOINIT
104 #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers
106 #define PARAMS(args...) args
108 /* Handle unknown syscalls */
110 #define TRACE_SYSTEM syscalls_unknown
111 #include <instrumentation/syscalls/headers/syscalls_unknown.h>
116 extern const struct trace_syscall_table sc_table
;
117 extern const struct trace_syscall_table compat_sc_table
;
119 /* Event syscall exit table */
120 extern const struct trace_syscall_table sc_exit_table
;
121 extern const struct trace_syscall_table compat_sc_exit_table
;
126 #undef CREATE_SYSCALL_TABLE
128 struct lttng_syscall_filter
{
129 DECLARE_BITMAP(sc_entry
, NR_syscalls
);
130 DECLARE_BITMAP(sc_exit
, NR_syscalls
);
131 DECLARE_BITMAP(sc_compat_entry
, NR_compat_syscalls
);
132 DECLARE_BITMAP(sc_compat_exit
, NR_compat_syscalls
);
136 int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common
*event_enabler
);
138 static void syscall_entry_event_unknown(struct hlist_head
*unknown_action_list_head
,
139 struct pt_regs
*regs
, long id
)
141 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
142 struct lttng_kernel_event_common_private
*event_priv
;
144 lttng_syscall_get_arguments(current
, regs
, args
);
145 lttng_hlist_for_each_entry_rcu(event_priv
, unknown_action_list_head
, u
.syscall
.node
) {
146 if (unlikely(in_compat_syscall()))
147 __event_probe__compat_syscall_entry_unknown(event_priv
->pub
, id
, args
);
149 __event_probe__syscall_entry_unknown(event_priv
->pub
, id
, args
);
153 static __always_inline
154 void syscall_entry_event_call_func(struct hlist_head
*action_list
,
155 void *func
, unsigned int nrargs
,
156 struct pt_regs
*regs
)
158 struct lttng_kernel_event_common_private
*event_priv
;
163 void (*fptr
)(void *__data
) = func
;
165 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
166 fptr(event_priv
->pub
);
171 void (*fptr
)(void *__data
, unsigned long arg0
) = func
;
172 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
174 lttng_syscall_get_arguments(current
, regs
, args
);
175 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
176 fptr(event_priv
->pub
, args
[0]);
181 void (*fptr
)(void *__data
,
183 unsigned long arg1
) = func
;
184 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
186 lttng_syscall_get_arguments(current
, regs
, args
);
187 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
188 fptr(event_priv
->pub
, args
[0], args
[1]);
193 void (*fptr
)(void *__data
,
196 unsigned long arg2
) = func
;
197 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
199 lttng_syscall_get_arguments(current
, regs
, args
);
200 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
201 fptr(event_priv
->pub
, args
[0], args
[1], args
[2]);
206 void (*fptr
)(void *__data
,
210 unsigned long arg3
) = func
;
211 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
213 lttng_syscall_get_arguments(current
, regs
, args
);
214 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
215 fptr(event_priv
->pub
, args
[0], args
[1], args
[2], args
[3]);
220 void (*fptr
)(void *__data
,
225 unsigned long arg4
) = func
;
226 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
228 lttng_syscall_get_arguments(current
, regs
, args
);
229 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
230 fptr(event_priv
->pub
, args
[0], args
[1], args
[2], args
[3], args
[4]);
235 void (*fptr
)(void *__data
,
241 unsigned long arg5
) = func
;
242 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
244 lttng_syscall_get_arguments(current
, regs
, args
);
245 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
246 fptr(event_priv
->pub
, args
[0], args
[1], args
[2],
247 args
[3], args
[4], args
[5]);
255 void syscall_entry_event_probe(void *__data
, struct pt_regs
*regs
, long id
)
257 struct lttng_kernel_syscall_table
*syscall_table
= __data
;
258 struct hlist_head
*action_list
, *unknown_action_list
;
259 const struct trace_syscall_entry
*table
, *entry
;
262 if (unlikely(in_compat_syscall())) {
263 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
265 if (id
< 0 || id
>= NR_compat_syscalls
266 || (!READ_ONCE(syscall_table
->syscall_all_entry
) && !test_bit(id
, filter
->sc_compat_entry
))) {
267 /* System call filtered out. */
270 table
= compat_sc_table
.table
;
271 table_len
= compat_sc_table
.len
;
272 unknown_action_list
= &syscall_table
->compat_unknown_syscall_dispatch
;
274 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
276 if (id
< 0 || id
>= NR_syscalls
277 || (!READ_ONCE(syscall_table
->syscall_all_entry
) && !test_bit(id
, filter
->sc_entry
))) {
278 /* System call filtered out. */
281 table
= sc_table
.table
;
282 table_len
= sc_table
.len
;
283 unknown_action_list
= &syscall_table
->unknown_syscall_dispatch
;
285 if (unlikely(id
< 0 || id
>= table_len
)) {
286 syscall_entry_event_unknown(unknown_action_list
, regs
, id
);
291 if (!entry
->event_func
) {
292 syscall_entry_event_unknown(unknown_action_list
, regs
, id
);
296 if (unlikely(in_compat_syscall())) {
297 action_list
= &syscall_table
->compat_syscall_dispatch
[id
];
299 action_list
= &syscall_table
->syscall_dispatch
[id
];
301 if (unlikely(hlist_empty(action_list
)))
304 syscall_entry_event_call_func(action_list
, entry
->event_func
, entry
->nrargs
, regs
);
307 static void syscall_exit_event_unknown(struct hlist_head
*unknown_action_list_head
,
308 struct pt_regs
*regs
, long id
, long ret
)
310 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
311 struct lttng_kernel_event_common_private
*event_priv
;
313 lttng_syscall_get_arguments(current
, regs
, args
);
314 lttng_hlist_for_each_entry_rcu(event_priv
, unknown_action_list_head
, u
.syscall
.node
) {
315 if (unlikely(in_compat_syscall()))
316 __event_probe__compat_syscall_exit_unknown(event_priv
->pub
, id
, ret
,
319 __event_probe__syscall_exit_unknown(event_priv
->pub
, id
, ret
, args
);
323 static __always_inline
324 void syscall_exit_event_call_func(struct hlist_head
*action_list
,
325 void *func
, unsigned int nrargs
,
326 struct pt_regs
*regs
, long ret
)
328 struct lttng_kernel_event_common_private
*event_priv
;
333 void (*fptr
)(void *__data
, long ret
) = func
;
335 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
336 fptr(event_priv
->pub
, ret
);
341 void (*fptr
)(void *__data
,
343 unsigned long arg0
) = func
;
344 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
346 lttng_syscall_get_arguments(current
, regs
, args
);
347 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
348 fptr(event_priv
->pub
, ret
, args
[0]);
353 void (*fptr
)(void *__data
,
356 unsigned long arg1
) = func
;
357 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
359 lttng_syscall_get_arguments(current
, regs
, args
);
360 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
361 fptr(event_priv
->pub
, ret
, args
[0], args
[1]);
366 void (*fptr
)(void *__data
,
370 unsigned long arg2
) = func
;
371 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
373 lttng_syscall_get_arguments(current
, regs
, args
);
374 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
375 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2]);
380 void (*fptr
)(void *__data
,
385 unsigned long arg3
) = func
;
386 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
388 lttng_syscall_get_arguments(current
, regs
, args
);
389 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
390 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2], args
[3]);
395 void (*fptr
)(void *__data
,
401 unsigned long arg4
) = func
;
402 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
404 lttng_syscall_get_arguments(current
, regs
, args
);
405 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
406 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2], args
[3], args
[4]);
411 void (*fptr
)(void *__data
,
418 unsigned long arg5
) = func
;
419 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
421 lttng_syscall_get_arguments(current
, regs
, args
);
422 lttng_hlist_for_each_entry_rcu(event_priv
, action_list
, u
.syscall
.node
)
423 fptr(event_priv
->pub
, ret
, args
[0], args
[1], args
[2],
424 args
[3], args
[4], args
[5]);
432 void syscall_exit_event_probe(void *__data
, struct pt_regs
*regs
, long ret
)
434 struct lttng_kernel_syscall_table
*syscall_table
= __data
;
435 struct hlist_head
*action_list
, *unknown_action_list
;
436 const struct trace_syscall_entry
*table
, *entry
;
440 id
= syscall_get_nr(current
, regs
);
442 if (unlikely(in_compat_syscall())) {
443 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
445 if (id
< 0 || id
>= NR_compat_syscalls
446 || (!READ_ONCE(syscall_table
->syscall_all_exit
) && !test_bit(id
, filter
->sc_compat_exit
))) {
447 /* System call filtered out. */
450 table
= compat_sc_exit_table
.table
;
451 table_len
= compat_sc_exit_table
.len
;
452 unknown_action_list
= &syscall_table
->compat_unknown_syscall_exit_dispatch
;
454 struct lttng_syscall_filter
*filter
= syscall_table
->sc_filter
;
456 if (id
< 0 || id
>= NR_syscalls
457 || (!READ_ONCE(syscall_table
->syscall_all_exit
) && !test_bit(id
, filter
->sc_exit
))) {
458 /* System call filtered out. */
461 table
= sc_exit_table
.table
;
462 table_len
= sc_exit_table
.len
;
463 unknown_action_list
= &syscall_table
->unknown_syscall_exit_dispatch
;
465 if (unlikely(id
< 0 || id
>= table_len
)) {
466 syscall_exit_event_unknown(unknown_action_list
, regs
, id
, ret
);
471 if (!entry
->event_func
) {
472 syscall_exit_event_unknown(unknown_action_list
, regs
, id
, ret
);
476 if (unlikely(in_compat_syscall())) {
477 action_list
= &syscall_table
->compat_syscall_exit_dispatch
[id
];
479 action_list
= &syscall_table
->syscall_exit_dispatch
[id
];
481 if (unlikely(hlist_empty(action_list
)))
484 syscall_exit_event_call_func(action_list
, entry
->event_func
, entry
->nrargs
,
489 struct lttng_kernel_syscall_table
*get_syscall_table_from_enabler(struct lttng_event_enabler_common
*event_enabler
)
491 switch (event_enabler
->enabler_type
) {
492 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
494 struct lttng_event_recorder_enabler
*event_recorder_enabler
=
495 container_of(event_enabler
, struct lttng_event_recorder_enabler
, parent
);
496 return &event_recorder_enabler
->chan
->priv
->parent
.syscall_table
;
498 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
500 struct lttng_event_notifier_enabler
*event_notifier_enabler
=
501 container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
502 return &event_notifier_enabler
->group
->syscall_table
;
510 struct lttng_kernel_syscall_table
*get_syscall_table_from_event(struct lttng_kernel_event_common
*event
)
512 switch (event
->type
) {
513 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
515 struct lttng_kernel_event_recorder
*event_recorder
=
516 container_of(event
, struct lttng_kernel_event_recorder
, parent
);
517 return &event_recorder
->chan
->priv
->parent
.syscall_table
;
519 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
521 struct lttng_kernel_event_notifier
*event_notifier
=
522 container_of(event
, struct lttng_kernel_event_notifier
, parent
);
523 return &event_notifier
->priv
->group
->syscall_table
;
531 void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common
*syscall_event_enabler
,
532 const struct lttng_kernel_event_desc
*desc
, struct hlist_head
*dispatch_table
,
533 enum sc_type type
, unsigned int syscall_nr
)
535 struct lttng_kernel_event_common
*event
;
537 switch (syscall_event_enabler
->enabler_type
) {
538 case LTTNG_EVENT_ENABLER_TYPE_RECORDER
:
540 struct lttng_event_recorder_enabler
*syscall_event_recorder_enabler
=
541 container_of(syscall_event_enabler
, struct lttng_event_recorder_enabler
, parent
);
542 struct lttng_event_recorder_enabler
*event_recorder_enabler
;
543 struct lttng_kernel_abi_event ev
;
545 /* We need to create an event for this syscall/enabler. */
546 memset(&ev
, 0, sizeof(ev
));
549 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
550 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
553 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
554 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
556 case SC_TYPE_COMPAT_ENTRY
:
557 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
558 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
560 case SC_TYPE_COMPAT_EXIT
:
561 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
562 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
565 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1);
566 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
567 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
568 event_recorder_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
,
569 syscall_event_recorder_enabler
->chan
);
570 WARN_ON_ONCE(!event_recorder_enabler
);
571 if (!event_recorder_enabler
)
573 event
= _lttng_kernel_event_create(&event_recorder_enabler
->parent
, desc
);
574 WARN_ON_ONCE(!event
|| IS_ERR(event
));
575 lttng_event_enabler_destroy(&event_recorder_enabler
->parent
);
576 if (!event
|| IS_ERR(event
)) {
577 printk(KERN_INFO
"Unable to create event recorder %s\n", desc
->event_name
);
580 hlist_add_head(&event
->priv
->u
.syscall
.node
, &dispatch_table
[syscall_nr
]);
583 case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
:
585 struct lttng_event_notifier_enabler
*syscall_event_notifier_enabler
=
586 container_of(syscall_event_enabler
, struct lttng_event_notifier_enabler
, parent
);
587 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
588 struct lttng_kernel_abi_event_notifier event_notifier_param
;
589 uint64_t user_token
= syscall_event_enabler
->user_token
;
590 uint64_t error_counter_index
= syscall_event_notifier_enabler
->error_counter_index
;
592 memset(&event_notifier_param
, 0, sizeof(event_notifier_param
));
595 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
596 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
599 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
600 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
602 case SC_TYPE_COMPAT_ENTRY
:
603 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
604 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
606 case SC_TYPE_COMPAT_EXIT
:
607 event_notifier_param
.event
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
608 event_notifier_param
.event
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
611 strncat(event_notifier_param
.event
.name
, desc
->event_name
,
612 LTTNG_KERNEL_ABI_SYM_NAME_LEN
- strlen(event_notifier_param
.event
.name
) - 1);
613 event_notifier_param
.event
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
614 event_notifier_param
.event
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
615 event_notifier_param
.event
.token
= user_token
;
616 event_notifier_param
.error_counter_index
= error_counter_index
;
618 event_notifier_enabler
= lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME
,
619 &event_notifier_param
, syscall_event_notifier_enabler
->group
);
620 WARN_ON_ONCE(!event_notifier_enabler
);
621 event
= _lttng_kernel_event_create(&event_notifier_enabler
->parent
, desc
);
622 WARN_ON_ONCE(!event
|| IS_ERR(event
));
623 lttng_event_enabler_destroy(&event_notifier_enabler
->parent
);
624 if (!event
|| IS_ERR(event
)) {
625 printk(KERN_INFO
"Unable to create event notifier %s\n", desc
->event_name
);
628 event
->priv
->u
.syscall
.syscall_id
= syscall_nr
;
637 * noinline to diminish caller stack size.
638 * Should be called with sessions lock held.
641 int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry
*table
, size_t table_len
,
642 struct hlist_head
*dispatch_table
, struct lttng_event_recorder_enabler
*syscall_event_enabler
,
645 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&syscall_event_enabler
->parent
);
648 /* Allocate events for each syscall matching enabler, insert into table */
649 for (i
= 0; i
< table_len
; i
++) {
650 const struct lttng_kernel_event_desc
*desc
= table
[i
].desc
;
651 struct lttng_kernel_event_common_private
*event_priv
;
652 struct hlist_head
*head
;
656 /* Unknown syscall */
659 if (!lttng_desc_match_enabler(desc
,
660 lttng_event_recorder_enabler_as_enabler(syscall_event_enabler
)))
663 * Check if already created.
665 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
666 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
667 if (lttng_event_enabler_desc_match_event(&syscall_event_enabler
->parent
, desc
, event_priv
->pub
))
673 lttng_syscall_event_enabler_create_event(&syscall_event_enabler
->parent
, desc
, dispatch_table
, type
, i
);
679 int lttng_syscalls_populate_events(struct lttng_event_enabler_common
*syscall_event_enabler
)
681 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(syscall_event_enabler
);
682 struct lttng_event_recorder_enabler
*event_recorder_enabler
;
683 struct lttng_kernel_channel_buffer
*chan
;
684 struct lttng_kernel_abi_event ev
;
687 if (syscall_event_enabler
->enabler_type
!= LTTNG_EVENT_ENABLER_TYPE_RECORDER
)
689 event_recorder_enabler
= container_of(syscall_event_enabler
, struct lttng_event_recorder_enabler
, parent
);
690 chan
= event_recorder_enabler
->chan
;
692 if (hlist_empty(&syscall_table
->unknown_syscall_dispatch
)) {
693 const struct lttng_kernel_event_desc
*desc
=
694 &__event_desc___syscall_entry_unknown
;
695 struct lttng_kernel_event_common
*event
;
696 struct lttng_event_recorder_enabler
*event_enabler
;
698 memset(&ev
, 0, sizeof(ev
));
699 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
700 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
701 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
702 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
703 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
704 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
705 if (!event_enabler
) {
708 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
709 lttng_event_enabler_destroy(&event_enabler
->parent
);
710 WARN_ON_ONCE(!event
);
712 return PTR_ERR(event
);
714 hlist_add_head(&event
->priv
->u
.syscall
.node
, &syscall_table
->unknown_syscall_dispatch
);
717 if (hlist_empty(&syscall_table
->compat_unknown_syscall_dispatch
)) {
718 const struct lttng_kernel_event_desc
*desc
=
719 &__event_desc___compat_syscall_entry_unknown
;
720 struct lttng_kernel_event_common
*event
;
721 struct lttng_event_recorder_enabler
*event_enabler
;
723 memset(&ev
, 0, sizeof(ev
));
724 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
725 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
726 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
727 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_ENTRY
;
728 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
729 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
730 if (!event_enabler
) {
733 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
734 WARN_ON_ONCE(!event
);
735 lttng_event_enabler_destroy(&event_enabler
->parent
);
737 return PTR_ERR(event
);
739 hlist_add_head(&event
->priv
->u
.syscall
.node
, &syscall_table
->compat_unknown_syscall_dispatch
);
742 if (hlist_empty(&syscall_table
->compat_unknown_syscall_exit_dispatch
)) {
743 const struct lttng_kernel_event_desc
*desc
=
744 &__event_desc___compat_syscall_exit_unknown
;
745 struct lttng_kernel_event_common
*event
;
746 struct lttng_event_recorder_enabler
*event_enabler
;
748 memset(&ev
, 0, sizeof(ev
));
749 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
750 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
751 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
752 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
753 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT
;
754 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
755 if (!event_enabler
) {
758 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
759 WARN_ON_ONCE(!event
);
760 lttng_event_enabler_destroy(&event_enabler
->parent
);
762 return PTR_ERR(event
);
764 hlist_add_head(&event
->priv
->u
.syscall
.node
, &syscall_table
->compat_unknown_syscall_exit_dispatch
);
767 if (hlist_empty(&syscall_table
->unknown_syscall_exit_dispatch
)) {
768 const struct lttng_kernel_event_desc
*desc
=
769 &__event_desc___syscall_exit_unknown
;
770 struct lttng_kernel_event_common
*event
;
771 struct lttng_event_recorder_enabler
*event_enabler
;
773 memset(&ev
, 0, sizeof(ev
));
774 strncpy(ev
.name
, desc
->event_name
, LTTNG_KERNEL_ABI_SYM_NAME_LEN
);
775 ev
.name
[LTTNG_KERNEL_ABI_SYM_NAME_LEN
- 1] = '\0';
776 ev
.instrumentation
= LTTNG_KERNEL_ABI_SYSCALL
;
777 ev
.u
.syscall
.entryexit
= LTTNG_KERNEL_ABI_SYSCALL_EXIT
;
778 ev
.u
.syscall
.abi
= LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE
;
779 event_enabler
= lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME
, &ev
, chan
);
780 if (!event_enabler
) {
783 event
= _lttng_kernel_event_create(&event_enabler
->parent
, desc
);
784 WARN_ON_ONCE(!event
);
785 lttng_event_enabler_destroy(&event_enabler
->parent
);
787 return PTR_ERR(event
);
789 hlist_add_head(&event
->priv
->u
.syscall
.node
, &syscall_table
->unknown_syscall_exit_dispatch
);
792 ret
= lttng_create_syscall_event_if_missing(sc_table
.table
, sc_table
.len
,
793 syscall_table
->syscall_dispatch
, event_recorder_enabler
, SC_TYPE_ENTRY
);
796 ret
= lttng_create_syscall_event_if_missing(sc_exit_table
.table
, sc_exit_table
.len
,
797 syscall_table
->syscall_exit_dispatch
, event_recorder_enabler
, SC_TYPE_EXIT
);
802 ret
= lttng_create_syscall_event_if_missing(compat_sc_table
.table
, compat_sc_table
.len
,
803 syscall_table
->compat_syscall_dispatch
, event_recorder_enabler
, SC_TYPE_COMPAT_ENTRY
);
806 ret
= lttng_create_syscall_event_if_missing(compat_sc_exit_table
.table
, compat_sc_exit_table
.len
,
807 syscall_table
->compat_syscall_exit_dispatch
, event_recorder_enabler
, SC_TYPE_COMPAT_EXIT
);
815 * Should be called with sessions lock held.
817 int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common
*syscall_event_enabler
)
819 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(syscall_event_enabler
);
822 if (!syscall_table
->syscall_dispatch
) {
823 /* create syscall table mapping syscall to events */
824 syscall_table
->syscall_dispatch
= kzalloc(sizeof(struct hlist_head
) * sc_table
.len
, GFP_KERNEL
);
825 if (!syscall_table
->syscall_dispatch
)
828 if (!syscall_table
->syscall_exit_dispatch
) {
829 /* create syscall table mapping syscall to events */
830 syscall_table
->syscall_exit_dispatch
= kzalloc(sizeof(struct hlist_head
) * sc_exit_table
.len
, GFP_KERNEL
);
831 if (!syscall_table
->syscall_exit_dispatch
)
837 if (!syscall_table
->compat_syscall_dispatch
) {
838 /* create syscall table mapping compat syscall to events */
839 syscall_table
->compat_syscall_dispatch
= kzalloc(sizeof(struct hlist_head
) * compat_sc_table
.len
, GFP_KERNEL
);
840 if (!syscall_table
->compat_syscall_dispatch
)
844 if (!syscall_table
->compat_syscall_exit_dispatch
) {
845 /* create syscall table mapping compat syscall to events */
846 syscall_table
->compat_syscall_exit_dispatch
= kzalloc(sizeof(struct hlist_head
) * compat_sc_exit_table
.len
, GFP_KERNEL
);
847 if (!syscall_table
->compat_syscall_exit_dispatch
)
851 if (!syscall_table
->sc_filter
) {
852 syscall_table
->sc_filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
854 if (!syscall_table
->sc_filter
)
858 ret
= lttng_syscalls_populate_events(syscall_event_enabler
);
862 ret
= lttng_syscalls_create_matching_event_notifiers(syscall_event_enabler
);
866 if (!syscall_table
->sys_enter_registered
) {
867 ret
= lttng_wrapper_tracepoint_probe_register("sys_enter",
868 (void *) syscall_entry_event_probe
, syscall_table
);
871 syscall_table
->sys_enter_registered
= 1;
873 if (!syscall_table
->sys_exit_registered
) {
874 ret
= lttng_wrapper_tracepoint_probe_register("sys_exit",
875 (void *) syscall_exit_event_probe
, syscall_table
);
877 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
878 (void *) syscall_entry_event_probe
, syscall_table
));
881 syscall_table
->sys_exit_registered
= 1;
888 void create_unknown_event_notifier(
889 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
892 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(&event_notifier_enabler
->parent
);
893 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&event_notifier_enabler
->parent
);
894 struct lttng_kernel_event_common_private
*event_priv
;
895 const struct lttng_kernel_event_desc
*desc
;
896 struct hlist_head
*unknown_dispatch_list
;
898 struct hlist_head
*head
;
902 desc
= &__event_desc___syscall_entry_unknown
;
903 unknown_dispatch_list
= &syscall_table
->unknown_syscall_dispatch
;
906 desc
= &__event_desc___syscall_exit_unknown
;
907 unknown_dispatch_list
= &syscall_table
->unknown_syscall_exit_dispatch
;
909 case SC_TYPE_COMPAT_ENTRY
:
910 desc
= &__event_desc___compat_syscall_entry_unknown
;
911 unknown_dispatch_list
= &syscall_table
->compat_unknown_syscall_dispatch
;
913 case SC_TYPE_COMPAT_EXIT
:
914 desc
= &__event_desc___compat_syscall_exit_unknown
;
915 unknown_dispatch_list
= &syscall_table
->compat_unknown_syscall_exit_dispatch
;
922 * Check if already created.
924 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
925 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
926 if (lttng_event_enabler_desc_match_event(&event_notifier_enabler
->parent
, desc
, event_priv
->pub
))
930 lttng_syscall_event_enabler_create_event(&event_notifier_enabler
->parent
, desc
, unknown_dispatch_list
, type
, -1U);
934 void create_matching_event_notifiers(
935 struct lttng_event_notifier_enabler
*syscall_event_notifier_enabler
,
936 const struct trace_syscall_entry
*table
,
937 size_t table_len
, enum sc_type type
)
939 struct lttng_event_ht
*events_ht
= lttng_get_event_ht_from_enabler(&syscall_event_notifier_enabler
->parent
);
940 const struct lttng_kernel_event_desc
*desc
;
943 /* iterate over all syscall and create event_notifier that match */
944 for (i
= 0; i
< table_len
; i
++) {
945 struct lttng_kernel_event_common_private
*event_priv
;
946 struct hlist_head
*head
;
949 desc
= table
[i
].desc
;
951 /* Unknown syscall */
955 if (!lttng_desc_match_enabler(desc
,
956 lttng_event_notifier_enabler_as_enabler(syscall_event_notifier_enabler
)))
960 * Check if already created.
962 head
= utils_borrow_hash_table_bucket(events_ht
->table
, LTTNG_EVENT_HT_SIZE
, desc
->event_name
);
963 lttng_hlist_for_each_entry(event_priv
, head
, hlist_node
) {
964 if (lttng_event_enabler_desc_match_event(&syscall_event_notifier_enabler
->parent
, desc
, event_priv
->pub
))
970 lttng_syscall_event_enabler_create_event(&syscall_event_notifier_enabler
->parent
, desc
, NULL
, type
, i
);
975 int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common
*event_enabler
)
978 enum lttng_kernel_abi_syscall_entryexit entryexit
=
979 event_enabler
->event_param
.u
.syscall
.entryexit
;
980 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
982 if (event_enabler
->enabler_type
!= LTTNG_EVENT_ENABLER_TYPE_NOTIFIER
)
984 event_notifier_enabler
= container_of(event_enabler
, struct lttng_event_notifier_enabler
, parent
);
986 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
) {
987 create_matching_event_notifiers(event_notifier_enabler
,
988 sc_table
.table
, sc_table
.len
, SC_TYPE_ENTRY
);
989 create_matching_event_notifiers(event_notifier_enabler
,
990 compat_sc_table
.table
, compat_sc_table
.len
,
991 SC_TYPE_COMPAT_ENTRY
);
992 create_unknown_event_notifier(event_notifier_enabler
, SC_TYPE_ENTRY
);
993 create_unknown_event_notifier(event_notifier_enabler
, SC_TYPE_COMPAT_ENTRY
);
996 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
) {
997 create_matching_event_notifiers(event_notifier_enabler
,
998 sc_exit_table
.table
, sc_exit_table
.len
,
1000 create_matching_event_notifiers(event_notifier_enabler
,
1001 compat_sc_exit_table
.table
, compat_sc_exit_table
.len
,
1002 SC_TYPE_COMPAT_EXIT
);
1003 create_unknown_event_notifier(event_notifier_enabler
, SC_TYPE_EXIT
);
1004 create_unknown_event_notifier(event_notifier_enabler
, SC_TYPE_COMPAT_EXIT
);
1009 int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table
*syscall_table
)
1013 if (!syscall_table
->syscall_dispatch
)
1015 if (syscall_table
->sys_enter_registered
) {
1016 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_enter",
1017 (void *) syscall_entry_event_probe
, syscall_table
);
1020 syscall_table
->sys_enter_registered
= 0;
1022 if (syscall_table
->sys_exit_registered
) {
1023 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_exit",
1024 (void *) syscall_exit_event_probe
, syscall_table
);
1027 syscall_table
->sys_exit_registered
= 0;
1032 int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table
*syscall_table
)
1034 kfree(syscall_table
->syscall_dispatch
);
1035 kfree(syscall_table
->syscall_exit_dispatch
);
1036 #ifdef CONFIG_COMPAT
1037 kfree(syscall_table
->compat_syscall_dispatch
);
1038 kfree(syscall_table
->compat_syscall_exit_dispatch
);
1040 kfree(syscall_table
->sc_filter
);
1045 int get_syscall_nr(const char *syscall_name
)
1047 int syscall_nr
= -1;
1050 for (i
= 0; i
< sc_table
.len
; i
++) {
1051 const struct trace_syscall_entry
*entry
;
1052 const char *it_name
;
1054 entry
= &sc_table
.table
[i
];
1057 it_name
= entry
->desc
->event_name
;
1058 it_name
+= strlen(SYSCALL_ENTRY_STR
);
1059 if (!strcmp(syscall_name
, it_name
)) {
1068 int get_compat_syscall_nr(const char *syscall_name
)
1070 int syscall_nr
= -1;
1073 for (i
= 0; i
< compat_sc_table
.len
; i
++) {
1074 const struct trace_syscall_entry
*entry
;
1075 const char *it_name
;
1077 entry
= &compat_sc_table
.table
[i
];
1080 it_name
= entry
->desc
->event_name
;
1081 it_name
+= strlen(COMPAT_SYSCALL_ENTRY_STR
);
1082 if (!strcmp(syscall_name
, it_name
)) {
1091 uint32_t get_sc_tables_len(void)
1093 return sc_table
.len
+ compat_sc_table
.len
;
1097 const char *get_syscall_name(const char *desc_name
,
1098 enum lttng_syscall_abi abi
,
1099 enum lttng_syscall_entryexit entryexit
)
1101 size_t prefix_len
= 0;
1104 switch (entryexit
) {
1105 case LTTNG_SYSCALL_ENTRY
:
1107 case LTTNG_SYSCALL_ABI_NATIVE
:
1108 prefix_len
= strlen(SYSCALL_ENTRY_STR
);
1110 case LTTNG_SYSCALL_ABI_COMPAT
:
1111 prefix_len
= strlen(COMPAT_SYSCALL_ENTRY_STR
);
1115 case LTTNG_SYSCALL_EXIT
:
1117 case LTTNG_SYSCALL_ABI_NATIVE
:
1118 prefix_len
= strlen(SYSCALL_EXIT_STR
);
1120 case LTTNG_SYSCALL_ABI_COMPAT
:
1121 prefix_len
= strlen(COMPAT_SYSCALL_EXIT_STR
);
1126 WARN_ON_ONCE(prefix_len
== 0);
1127 return desc_name
+ prefix_len
;
1131 int lttng_syscall_filter_enable(
1132 struct lttng_syscall_filter
*filter
,
1133 const char *desc_name
, enum lttng_syscall_abi abi
,
1134 enum lttng_syscall_entryexit entryexit
)
1136 const char *syscall_name
;
1137 unsigned long *bitmap
;
1140 syscall_name
= get_syscall_name(desc_name
, abi
, entryexit
);
1143 case LTTNG_SYSCALL_ABI_NATIVE
:
1144 syscall_nr
= get_syscall_nr(syscall_name
);
1146 case LTTNG_SYSCALL_ABI_COMPAT
:
1147 syscall_nr
= get_compat_syscall_nr(syscall_name
);
1155 switch (entryexit
) {
1156 case LTTNG_SYSCALL_ENTRY
:
1158 case LTTNG_SYSCALL_ABI_NATIVE
:
1159 bitmap
= filter
->sc_entry
;
1161 case LTTNG_SYSCALL_ABI_COMPAT
:
1162 bitmap
= filter
->sc_compat_entry
;
1168 case LTTNG_SYSCALL_EXIT
:
1170 case LTTNG_SYSCALL_ABI_NATIVE
:
1171 bitmap
= filter
->sc_exit
;
1173 case LTTNG_SYSCALL_ABI_COMPAT
:
1174 bitmap
= filter
->sc_compat_exit
;
1183 if (test_bit(syscall_nr
, bitmap
))
1185 bitmap_set(bitmap
, syscall_nr
, 1);
1189 int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common
*event
)
1191 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_event(event
);
1194 WARN_ON_ONCE(event
->priv
->instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
);
1196 ret
= lttng_syscall_filter_enable(syscall_table
->sc_filter
,
1197 event
->priv
->desc
->event_name
, event
->priv
->u
.syscall
.abi
,
1198 event
->priv
->u
.syscall
.entryexit
);
1202 switch (event
->type
) {
1203 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1205 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1207 unsigned int syscall_id
= event
->priv
->u
.syscall
.syscall_id
;
1208 struct hlist_head
*dispatch_list
;
1210 switch (event
->priv
->u
.syscall
.entryexit
) {
1211 case LTTNG_SYSCALL_ENTRY
:
1212 switch (event
->priv
->u
.syscall
.abi
) {
1213 case LTTNG_SYSCALL_ABI_NATIVE
:
1214 dispatch_list
= &syscall_table
->syscall_dispatch
[syscall_id
];
1216 case LTTNG_SYSCALL_ABI_COMPAT
:
1217 dispatch_list
= &syscall_table
->compat_syscall_dispatch
[syscall_id
];
1224 case LTTNG_SYSCALL_EXIT
:
1225 switch (event
->priv
->u
.syscall
.abi
) {
1226 case LTTNG_SYSCALL_ABI_NATIVE
:
1227 dispatch_list
= &syscall_table
->syscall_exit_dispatch
[syscall_id
];
1229 case LTTNG_SYSCALL_ABI_COMPAT
:
1230 dispatch_list
= &syscall_table
->compat_syscall_exit_dispatch
[syscall_id
];
1242 hlist_add_head_rcu(&event
->priv
->u
.syscall
.node
, dispatch_list
);
1254 int lttng_syscall_filter_disable(struct lttng_syscall_filter
*filter
,
1255 const char *desc_name
, enum lttng_syscall_abi abi
,
1256 enum lttng_syscall_entryexit entryexit
)
1258 const char *syscall_name
;
1259 unsigned long *bitmap
;
1262 syscall_name
= get_syscall_name(desc_name
, abi
, entryexit
);
1265 case LTTNG_SYSCALL_ABI_NATIVE
:
1266 syscall_nr
= get_syscall_nr(syscall_name
);
1268 case LTTNG_SYSCALL_ABI_COMPAT
:
1269 syscall_nr
= get_compat_syscall_nr(syscall_name
);
1277 switch (entryexit
) {
1278 case LTTNG_SYSCALL_ENTRY
:
1280 case LTTNG_SYSCALL_ABI_NATIVE
:
1281 bitmap
= filter
->sc_entry
;
1283 case LTTNG_SYSCALL_ABI_COMPAT
:
1284 bitmap
= filter
->sc_compat_entry
;
1290 case LTTNG_SYSCALL_EXIT
:
1292 case LTTNG_SYSCALL_ABI_NATIVE
:
1293 bitmap
= filter
->sc_exit
;
1295 case LTTNG_SYSCALL_ABI_COMPAT
:
1296 bitmap
= filter
->sc_compat_exit
;
1305 if (!test_bit(syscall_nr
, bitmap
))
1307 bitmap_clear(bitmap
, syscall_nr
, 1);
1312 int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common
*event
)
1314 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_event(event
);
1317 ret
= lttng_syscall_filter_disable(syscall_table
->sc_filter
,
1318 event
->priv
->desc
->event_name
, event
->priv
->u
.syscall
.abi
,
1319 event
->priv
->u
.syscall
.entryexit
);
1323 switch (event
->type
) {
1324 case LTTNG_KERNEL_EVENT_TYPE_RECORDER
:
1326 case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER
:
1328 hlist_del_rcu(&event
->priv
->u
.syscall
.node
);
1338 void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common
*event_enabler
)
1340 struct lttng_kernel_syscall_table
*syscall_table
= get_syscall_table_from_enabler(event_enabler
);
1341 enum lttng_kernel_abi_syscall_entryexit entryexit
;
1342 int enabled
= event_enabler
->enabled
;
1344 if (event_enabler
->event_param
.instrumentation
!= LTTNG_KERNEL_ABI_SYSCALL
)
1346 if (event_enabler
->event_param
.u
.syscall
.abi
!= LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL
)
1348 if (event_enabler
->event_param
.u
.syscall
.match
!= LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME
)
1350 if (strcmp(event_enabler
->event_param
.name
, "*"))
1353 entryexit
= event_enabler
->event_param
.u
.syscall
.entryexit
;
1354 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRY
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
1355 WRITE_ONCE(syscall_table
->syscall_all_entry
, enabled
);
1357 if (entryexit
== LTTNG_KERNEL_ABI_SYSCALL_EXIT
|| entryexit
== LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT
)
1358 WRITE_ONCE(syscall_table
->syscall_all_exit
, enabled
);
1362 const struct trace_syscall_entry
*syscall_list_get_entry(loff_t
*pos
)
1364 const struct trace_syscall_entry
*entry
;
1367 for (entry
= sc_table
.table
;
1368 entry
< sc_table
.table
+ sc_table
.len
;
1373 for (entry
= compat_sc_table
.table
;
1374 entry
< compat_sc_table
.table
+ compat_sc_table
.len
;
1384 void *syscall_list_start(struct seq_file
*m
, loff_t
*pos
)
1386 return (void *) syscall_list_get_entry(pos
);
1390 void *syscall_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1393 return (void *) syscall_list_get_entry(ppos
);
1397 void syscall_list_stop(struct seq_file
*m
, void *p
)
1402 int get_sc_table(const struct trace_syscall_entry
*entry
,
1403 const struct trace_syscall_entry
**table
,
1404 unsigned int *bitness
)
1406 if (entry
>= sc_table
.table
&& entry
< sc_table
.table
+ sc_table
.len
) {
1408 *bitness
= BITS_PER_LONG
;
1410 *table
= sc_table
.table
;
1413 if (!(entry
>= compat_sc_table
.table
1414 && entry
< compat_sc_table
.table
+ compat_sc_table
.len
)) {
1420 *table
= compat_sc_table
.table
;
1425 int syscall_list_show(struct seq_file
*m
, void *p
)
1427 const struct trace_syscall_entry
*table
, *entry
= p
;
1428 unsigned int bitness
;
1429 unsigned long index
;
1433 ret
= get_sc_table(entry
, &table
, &bitness
);
1438 if (table
== sc_table
.table
) {
1439 index
= entry
- table
;
1440 name
= &entry
->desc
->event_name
[strlen(SYSCALL_ENTRY_STR
)];
1442 index
= (entry
- table
) + sc_table
.len
;
1443 name
= &entry
->desc
->event_name
[strlen(COMPAT_SYSCALL_ENTRY_STR
)];
1445 seq_printf(m
, "syscall { index = %lu; name = %s; bitness = %u; };\n",
1446 index
, name
, bitness
);
1451 const struct seq_operations lttng_syscall_list_seq_ops
= {
1452 .start
= syscall_list_start
,
1453 .next
= syscall_list_next
,
1454 .stop
= syscall_list_stop
,
1455 .show
= syscall_list_show
,
1459 int lttng_syscall_list_open(struct inode
*inode
, struct file
*file
)
1461 return seq_open(file
, <tng_syscall_list_seq_ops
);
1464 const struct file_operations lttng_syscall_list_fops
= {
1465 .owner
= THIS_MODULE
,
1466 .open
= lttng_syscall_list_open
,
1468 .llseek
= seq_lseek
,
1469 .release
= seq_release
,
1473 * A syscall is enabled if it is traced for either entry or exit.
1475 long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table
*syscall_table
,
1476 struct lttng_kernel_abi_syscall_mask __user
*usyscall_mask
)
1478 uint32_t len
, sc_tables_len
, bitmask_len
;
1481 struct lttng_syscall_filter
*filter
;
1483 ret
= get_user(len
, &usyscall_mask
->len
);
1486 sc_tables_len
= get_sc_tables_len();
1487 bitmask_len
= ALIGN(sc_tables_len
, 8) >> 3;
1488 if (len
< sc_tables_len
) {
1489 return put_user(sc_tables_len
, &usyscall_mask
->len
);
1491 /* Array is large enough, we can copy array to user-space. */
1492 tmp_mask
= kzalloc(bitmask_len
, GFP_KERNEL
);
1495 filter
= syscall_table
->sc_filter
;
1497 for (bit
= 0; bit
< sc_table
.len
; bit
++) {
1500 if (syscall_table
->syscall_dispatch
) {
1501 if (!(READ_ONCE(syscall_table
->syscall_all_entry
)
1502 || READ_ONCE(syscall_table
->syscall_all_exit
)) && filter
)
1503 state
= test_bit(bit
, filter
->sc_entry
)
1504 || test_bit(bit
, filter
->sc_exit
);
1510 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1512 for (; bit
< sc_tables_len
; bit
++) {
1515 if (syscall_table
->compat_syscall_dispatch
) {
1516 if (!(READ_ONCE(syscall_table
->syscall_all_entry
)
1517 || READ_ONCE(syscall_table
->syscall_all_exit
)) && filter
)
1518 state
= test_bit(bit
- sc_table
.len
,
1519 filter
->sc_compat_entry
)
1520 || test_bit(bit
- sc_table
.len
,
1521 filter
->sc_compat_exit
);
1527 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1529 if (copy_to_user(usyscall_mask
->mask
, tmp_mask
, bitmask_len
))
1535 int lttng_abi_syscall_list(void)
1537 struct file
*syscall_list_file
;
1540 file_fd
= lttng_get_unused_fd();
1546 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
1547 <tng_syscall_list_fops
,
1549 if (IS_ERR(syscall_list_file
)) {
1550 ret
= PTR_ERR(syscall_list_file
);
1553 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
1556 fd_install(file_fd
, syscall_list_file
);
1560 fput(syscall_list_file
);
1562 put_unused_fd(file_fd
);