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>
34 # ifndef is_compat_task
35 # define is_compat_task() (0)
39 /* in_compat_syscall appears in kernel 4.6. */
40 #ifndef in_compat_syscall
41 #define in_compat_syscall() is_compat_task()
51 #define SYSCALL_ENTRY_TOK syscall_entry_
52 #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_
53 #define SYSCALL_EXIT_TOK syscall_exit_
54 #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_
56 #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK)
57 #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK)
58 #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK)
59 #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK)
62 void syscall_entry_probe(void *__data
, struct pt_regs
*regs
, long id
);
64 void syscall_exit_probe(void *__data
, struct pt_regs
*regs
, long ret
);
67 * Forward declarations for old kernels.
71 struct oldold_utsname
;
73 struct sel_arg_struct
;
74 struct mmap_arg_struct
;
79 * Forward declaration for kernels >= 5.6
86 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
87 typedef __kernel_old_time_t
time_t;
90 #ifdef IA32_NR_syscalls
91 #define NR_compat_syscalls IA32_NR_syscalls
93 #define NR_compat_syscalls NR_syscalls
97 * Create LTTng tracepoint probes.
99 #define LTTNG_PACKAGE_BUILD
100 #define CREATE_TRACE_POINTS
101 #define TP_MODULE_NOINIT
102 #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers
104 #define PARAMS(args...) args
106 /* Handle unknown syscalls */
108 #define TRACE_SYSTEM syscalls_unknown
109 #include <instrumentation/syscalls/headers/syscalls_unknown.h>
117 #define sc_in(...) __VA_ARGS__
121 #define sc_inout(...) __VA_ARGS__
123 /* Hijack probe callback for system call enter */
125 #define TP_PROBE_CB(_template) &syscall_entry_probe
126 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
127 LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
129 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
130 LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
131 PARAMS(_locvar), PARAMS(_code_pre), \
132 PARAMS(_fields), PARAMS(_code_post))
133 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
134 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields))
135 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
136 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name)
137 /* Enumerations only defined at first inclusion. */
138 #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \
139 LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values))
141 #define TRACE_SYSTEM syscall_entry_integers
142 #define TRACE_INCLUDE_FILE syscalls_integers
143 #include <instrumentation/syscalls/headers/syscalls_integers.h>
144 #undef TRACE_INCLUDE_FILE
146 #define TRACE_SYSTEM syscall_entry_pointers
147 #define TRACE_INCLUDE_FILE syscalls_pointers
148 #include <instrumentation/syscalls/headers/syscalls_pointers.h>
149 #undef TRACE_INCLUDE_FILE
151 #undef SC_LTTNG_TRACEPOINT_ENUM
152 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
153 #undef SC_LTTNG_TRACEPOINT_EVENT
154 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
155 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
157 #undef _TRACE_SYSCALLS_INTEGERS_H
158 #undef _TRACE_SYSCALLS_POINTERS_H
160 /* Hijack probe callback for compat system call enter */
161 #define TP_PROBE_CB(_template) &syscall_entry_probe
162 #define LTTNG_SC_COMPAT
163 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
164 LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
166 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
167 LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
168 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
169 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
170 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields))
171 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
172 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \
173 compat_syscall_entry_##_name)
174 /* Enumerations only defined at inital inclusion (not here). */
175 #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
176 #define TRACE_SYSTEM compat_syscall_entry_integers
177 #define TRACE_INCLUDE_FILE compat_syscalls_integers
178 #include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
179 #undef TRACE_INCLUDE_FILE
181 #define TRACE_SYSTEM compat_syscall_entry_pointers
182 #define TRACE_INCLUDE_FILE compat_syscalls_pointers
183 #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
184 #undef TRACE_INCLUDE_FILE
186 #undef SC_LTTNG_TRACEPOINT_ENUM
187 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
188 #undef SC_LTTNG_TRACEPOINT_EVENT
189 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
190 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
192 #undef _TRACE_SYSCALLS_INTEGERS_H
193 #undef _TRACE_SYSCALLS_POINTERS_H
194 #undef LTTNG_SC_COMPAT
201 #define sc_exit(...) __VA_ARGS__
205 #define sc_out(...) __VA_ARGS__
207 #define sc_inout(...) __VA_ARGS__
209 /* Hijack probe callback for system call exit */
210 #define TP_PROBE_CB(_template) &syscall_exit_probe
211 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
212 LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
214 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
215 LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
216 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
217 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
218 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields))
219 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
220 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \
221 syscall_exit_##_name)
222 /* Enumerations only defined at inital inclusion (not here). */
223 #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
224 #define TRACE_SYSTEM syscall_exit_integers
225 #define TRACE_INCLUDE_FILE syscalls_integers
226 #include <instrumentation/syscalls/headers/syscalls_integers.h>
227 #undef TRACE_INCLUDE_FILE
229 #define TRACE_SYSTEM syscall_exit_pointers
230 #define TRACE_INCLUDE_FILE syscalls_pointers
231 #include <instrumentation/syscalls/headers/syscalls_pointers.h>
232 #undef TRACE_INCLUDE_FILE
234 #undef SC_LTTNG_TRACEPOINT_ENUM
235 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
236 #undef SC_LTTNG_TRACEPOINT_EVENT
237 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
238 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
240 #undef _TRACE_SYSCALLS_INTEGERS_H
241 #undef _TRACE_SYSCALLS_POINTERS_H
244 /* Hijack probe callback for compat system call exit */
245 #define TP_PROBE_CB(_template) &syscall_exit_probe
246 #define LTTNG_SC_COMPAT
247 #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
248 LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
250 #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
251 LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
252 PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
253 #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
254 LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields))
255 #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
256 LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \
257 compat_syscall_exit_##_name)
258 /* Enumerations only defined at inital inclusion (not here). */
259 #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
260 #define TRACE_SYSTEM compat_syscall_exit_integers
261 #define TRACE_INCLUDE_FILE compat_syscalls_integers
262 #include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
263 #undef TRACE_INCLUDE_FILE
265 #define TRACE_SYSTEM compat_syscall_exit_pointers
266 #define TRACE_INCLUDE_FILE compat_syscalls_pointers
267 #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
268 #undef TRACE_INCLUDE_FILE
270 #undef SC_LTTNG_TRACEPOINT_ENUM
271 #undef SC_LTTNG_TRACEPOINT_EVENT_CODE
272 #undef SC_LTTNG_TRACEPOINT_EVENT
273 #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
274 #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
276 #undef _TRACE_SYSCALLS_INTEGERS_H
277 #undef _TRACE_SYSCALLS_POINTERS_H
278 #undef LTTNG_SC_COMPAT
282 #undef TP_MODULE_NOINIT
283 #undef LTTNG_PACKAGE_BUILD
284 #undef CREATE_TRACE_POINTS
286 struct trace_syscall_entry
{
288 const struct lttng_event_desc
*desc
;
289 const struct lttng_event_field
*fields
;
293 #define CREATE_SYSCALL_TABLE
300 #undef TRACE_SYSCALL_TABLE
301 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
303 .func = __event_probe__syscall_entry_##_template, \
304 .nrargs = (_nrargs), \
305 .fields = __event_fields___syscall_entry_##_template, \
306 .desc = &__event_desc___syscall_entry_##_name, \
309 /* Syscall enter tracing table */
310 static const struct trace_syscall_entry sc_table
[] = {
311 #include <instrumentation/syscalls/headers/syscalls_integers.h>
312 #include <instrumentation/syscalls/headers/syscalls_pointers.h>
315 #undef TRACE_SYSCALL_TABLE
316 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
318 .func = __event_probe__compat_syscall_entry_##_template, \
319 .nrargs = (_nrargs), \
320 .fields = __event_fields___compat_syscall_entry_##_template, \
321 .desc = &__event_desc___compat_syscall_entry_##_name, \
324 /* Compat syscall enter table */
325 const struct trace_syscall_entry compat_sc_table
[] = {
326 #include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
327 #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
335 #define sc_exit(...) __VA_ARGS__
337 #undef TRACE_SYSCALL_TABLE
338 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
340 .func = __event_probe__syscall_exit_##_template, \
341 .nrargs = (_nrargs), \
342 .fields = __event_fields___syscall_exit_##_template, \
343 .desc = &__event_desc___syscall_exit_##_name, \
346 /* Syscall exit table */
347 static const struct trace_syscall_entry sc_exit_table
[] = {
348 #include <instrumentation/syscalls/headers/syscalls_integers.h>
349 #include <instrumentation/syscalls/headers/syscalls_pointers.h>
352 #undef TRACE_SYSCALL_TABLE
353 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
355 .func = __event_probe__compat_syscall_exit_##_template, \
356 .nrargs = (_nrargs), \
357 .fields = __event_fields___compat_syscall_exit_##_template, \
358 .desc = &__event_desc___compat_syscall_exit_##_name, \
361 /* Compat syscall exit table */
362 const struct trace_syscall_entry compat_sc_exit_table
[] = {
363 #include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
364 #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
369 #undef CREATE_SYSCALL_TABLE
371 struct lttng_syscall_filter
{
372 DECLARE_BITMAP(sc
, NR_syscalls
);
373 DECLARE_BITMAP(sc_compat
, NR_compat_syscalls
);
376 static void syscall_entry_unknown(struct lttng_event
*event
,
377 struct pt_regs
*regs
, unsigned int id
)
379 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
381 lttng_syscall_get_arguments(current
, regs
, args
);
382 if (unlikely(in_compat_syscall()))
383 __event_probe__compat_syscall_entry_unknown(event
, id
, args
);
385 __event_probe__syscall_entry_unknown(event
, id
, args
);
388 void syscall_entry_probe(void *__data
, struct pt_regs
*regs
, long id
)
390 struct lttng_channel
*chan
= __data
;
391 struct lttng_event
*event
, *unknown_event
;
392 const struct trace_syscall_entry
*table
, *entry
;
395 if (unlikely(in_compat_syscall())) {
396 struct lttng_syscall_filter
*filter
;
398 filter
= lttng_rcu_dereference(chan
->sc_filter
);
400 if (id
< 0 || id
>= NR_compat_syscalls
401 || !test_bit(id
, filter
->sc_compat
)) {
402 /* System call filtered out. */
406 table
= compat_sc_table
;
407 table_len
= ARRAY_SIZE(compat_sc_table
);
408 unknown_event
= chan
->sc_compat_unknown
;
410 struct lttng_syscall_filter
*filter
;
412 filter
= lttng_rcu_dereference(chan
->sc_filter
);
414 if (id
< 0 || id
>= NR_syscalls
415 || !test_bit(id
, filter
->sc
)) {
416 /* System call filtered out. */
421 table_len
= ARRAY_SIZE(sc_table
);
422 unknown_event
= chan
->sc_unknown
;
424 if (unlikely(id
< 0 || id
>= table_len
)) {
425 syscall_entry_unknown(unknown_event
, regs
, id
);
428 if (unlikely(in_compat_syscall()))
429 event
= chan
->compat_sc_table
[id
];
431 event
= chan
->sc_table
[id
];
432 if (unlikely(!event
)) {
433 syscall_entry_unknown(unknown_event
, regs
, id
);
437 WARN_ON_ONCE(!entry
);
439 switch (entry
->nrargs
) {
442 void (*fptr
)(void *__data
) = entry
->func
;
449 void (*fptr
)(void *__data
, unsigned long arg0
) = entry
->func
;
450 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
452 lttng_syscall_get_arguments(current
, regs
, args
);
453 fptr(event
, args
[0]);
458 void (*fptr
)(void *__data
,
460 unsigned long arg1
) = entry
->func
;
461 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
463 lttng_syscall_get_arguments(current
, regs
, args
);
464 fptr(event
, args
[0], args
[1]);
469 void (*fptr
)(void *__data
,
472 unsigned long arg2
) = entry
->func
;
473 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
475 lttng_syscall_get_arguments(current
, regs
, args
);
476 fptr(event
, args
[0], args
[1], args
[2]);
481 void (*fptr
)(void *__data
,
485 unsigned long arg3
) = entry
->func
;
486 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
488 lttng_syscall_get_arguments(current
, regs
, args
);
489 fptr(event
, args
[0], args
[1], args
[2], args
[3]);
494 void (*fptr
)(void *__data
,
499 unsigned long arg4
) = entry
->func
;
500 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
502 lttng_syscall_get_arguments(current
, regs
, args
);
503 fptr(event
, args
[0], args
[1], args
[2], args
[3], args
[4]);
508 void (*fptr
)(void *__data
,
514 unsigned long arg5
) = entry
->func
;
515 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
517 lttng_syscall_get_arguments(current
, regs
, args
);
518 fptr(event
, args
[0], args
[1], args
[2],
519 args
[3], args
[4], args
[5]);
527 static void syscall_exit_unknown(struct lttng_event
*event
,
528 struct pt_regs
*regs
, int id
, long ret
)
530 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
532 lttng_syscall_get_arguments(current
, regs
, args
);
533 if (unlikely(in_compat_syscall()))
534 __event_probe__compat_syscall_exit_unknown(event
, id
, ret
,
537 __event_probe__syscall_exit_unknown(event
, id
, ret
, args
);
540 void syscall_exit_probe(void *__data
, struct pt_regs
*regs
, long ret
)
542 struct lttng_channel
*chan
= __data
;
543 struct lttng_event
*event
, *unknown_event
;
544 const struct trace_syscall_entry
*table
, *entry
;
548 id
= syscall_get_nr(current
, regs
);
549 if (unlikely(in_compat_syscall())) {
550 struct lttng_syscall_filter
*filter
;
552 filter
= lttng_rcu_dereference(chan
->sc_filter
);
554 if (id
< 0 || id
>= NR_compat_syscalls
555 || !test_bit(id
, filter
->sc_compat
)) {
556 /* System call filtered out. */
560 table
= compat_sc_exit_table
;
561 table_len
= ARRAY_SIZE(compat_sc_exit_table
);
562 unknown_event
= chan
->compat_sc_exit_unknown
;
564 struct lttng_syscall_filter
*filter
;
566 filter
= lttng_rcu_dereference(chan
->sc_filter
);
568 if (id
< 0 || id
>= NR_syscalls
569 || !test_bit(id
, filter
->sc
)) {
570 /* System call filtered out. */
574 table
= sc_exit_table
;
575 table_len
= ARRAY_SIZE(sc_exit_table
);
576 unknown_event
= chan
->sc_exit_unknown
;
578 if (unlikely(id
< 0 || id
>= table_len
)) {
579 syscall_exit_unknown(unknown_event
, regs
, id
, ret
);
582 if (unlikely(in_compat_syscall()))
583 event
= chan
->compat_sc_exit_table
[id
];
585 event
= chan
->sc_exit_table
[id
];
586 if (unlikely(!event
)) {
587 syscall_exit_unknown(unknown_event
, regs
, id
, ret
);
591 WARN_ON_ONCE(!entry
);
593 switch (entry
->nrargs
) {
596 void (*fptr
)(void *__data
, long ret
) = entry
->func
;
603 void (*fptr
)(void *__data
,
605 unsigned long arg0
) = entry
->func
;
606 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
608 lttng_syscall_get_arguments(current
, regs
, args
);
609 fptr(event
, ret
, args
[0]);
614 void (*fptr
)(void *__data
,
617 unsigned long arg1
) = entry
->func
;
618 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
620 lttng_syscall_get_arguments(current
, regs
, args
);
621 fptr(event
, ret
, args
[0], args
[1]);
626 void (*fptr
)(void *__data
,
630 unsigned long arg2
) = entry
->func
;
631 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
633 lttng_syscall_get_arguments(current
, regs
, args
);
634 fptr(event
, ret
, args
[0], args
[1], args
[2]);
639 void (*fptr
)(void *__data
,
644 unsigned long arg3
) = entry
->func
;
645 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
647 lttng_syscall_get_arguments(current
, regs
, args
);
648 fptr(event
, ret
, args
[0], args
[1], args
[2], args
[3]);
653 void (*fptr
)(void *__data
,
659 unsigned long arg4
) = entry
->func
;
660 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
662 lttng_syscall_get_arguments(current
, regs
, args
);
663 fptr(event
, ret
, args
[0], args
[1], args
[2], args
[3], args
[4]);
668 void (*fptr
)(void *__data
,
675 unsigned long arg5
) = entry
->func
;
676 unsigned long args
[LTTNG_SYSCALL_NR_ARGS
];
678 lttng_syscall_get_arguments(current
, regs
, args
);
679 fptr(event
, ret
, args
[0], args
[1], args
[2],
680 args
[3], args
[4], args
[5]);
689 * noinline to diminish caller stack size.
690 * Should be called with sessions lock held.
693 int fill_table(const struct trace_syscall_entry
*table
, size_t table_len
,
694 struct lttng_event
**chan_table
, struct lttng_channel
*chan
,
695 void *filter
, enum sc_type type
)
697 const struct lttng_event_desc
*desc
;
700 /* Allocate events for each syscall, insert into table */
701 for (i
= 0; i
< table_len
; i
++) {
702 struct lttng_kernel_event ev
;
703 desc
= table
[i
].desc
;
706 /* Unknown syscall */
710 * Skip those already populated by previous failed
711 * register for this channel.
715 memset(&ev
, 0, sizeof(ev
));
718 strncpy(ev
.name
, SYSCALL_ENTRY_STR
,
719 LTTNG_KERNEL_SYM_NAME_LEN
);
722 strncpy(ev
.name
, SYSCALL_EXIT_STR
,
723 LTTNG_KERNEL_SYM_NAME_LEN
);
725 case SC_TYPE_COMPAT_ENTRY
:
726 strncpy(ev
.name
, COMPAT_SYSCALL_ENTRY_STR
,
727 LTTNG_KERNEL_SYM_NAME_LEN
);
729 case SC_TYPE_COMPAT_EXIT
:
730 strncpy(ev
.name
, COMPAT_SYSCALL_EXIT_STR
,
731 LTTNG_KERNEL_SYM_NAME_LEN
);
737 strncat(ev
.name
, desc
->name
,
738 LTTNG_KERNEL_SYM_NAME_LEN
- strlen(ev
.name
) - 1);
739 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
740 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
741 chan_table
[i
] = _lttng_event_create(chan
, &ev
, filter
,
742 desc
, ev
.instrumentation
);
743 WARN_ON_ONCE(!chan_table
[i
]);
744 if (IS_ERR(chan_table
[i
])) {
746 * If something goes wrong in event registration
747 * after the first one, we have no choice but to
748 * leave the previous events in there, until
749 * deleted by session teardown.
751 return PTR_ERR(chan_table
[i
]);
758 * Should be called with sessions lock held.
760 int lttng_syscalls_register(struct lttng_channel
*chan
, void *filter
)
762 struct lttng_kernel_event ev
;
765 wrapper_vmalloc_sync_mappings();
767 if (!chan
->sc_table
) {
768 /* create syscall table mapping syscall to events */
769 chan
->sc_table
= kzalloc(sizeof(struct lttng_event
*)
770 * ARRAY_SIZE(sc_table
), GFP_KERNEL
);
774 if (!chan
->sc_exit_table
) {
775 /* create syscall table mapping syscall to events */
776 chan
->sc_exit_table
= kzalloc(sizeof(struct lttng_event
*)
777 * ARRAY_SIZE(sc_exit_table
), GFP_KERNEL
);
778 if (!chan
->sc_exit_table
)
784 if (!chan
->compat_sc_table
) {
785 /* create syscall table mapping compat syscall to events */
786 chan
->compat_sc_table
= kzalloc(sizeof(struct lttng_event
*)
787 * ARRAY_SIZE(compat_sc_table
), GFP_KERNEL
);
788 if (!chan
->compat_sc_table
)
792 if (!chan
->compat_sc_exit_table
) {
793 /* create syscall table mapping compat syscall to events */
794 chan
->compat_sc_exit_table
= kzalloc(sizeof(struct lttng_event
*)
795 * ARRAY_SIZE(compat_sc_exit_table
), GFP_KERNEL
);
796 if (!chan
->compat_sc_exit_table
)
800 if (!chan
->sc_unknown
) {
801 const struct lttng_event_desc
*desc
=
802 &__event_desc___syscall_entry_unknown
;
804 memset(&ev
, 0, sizeof(ev
));
805 strncpy(ev
.name
, desc
->name
, LTTNG_KERNEL_SYM_NAME_LEN
);
806 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
807 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
808 chan
->sc_unknown
= _lttng_event_create(chan
, &ev
, filter
,
811 WARN_ON_ONCE(!chan
->sc_unknown
);
812 if (IS_ERR(chan
->sc_unknown
)) {
813 return PTR_ERR(chan
->sc_unknown
);
817 if (!chan
->sc_compat_unknown
) {
818 const struct lttng_event_desc
*desc
=
819 &__event_desc___compat_syscall_entry_unknown
;
821 memset(&ev
, 0, sizeof(ev
));
822 strncpy(ev
.name
, desc
->name
, LTTNG_KERNEL_SYM_NAME_LEN
);
823 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
824 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
825 chan
->sc_compat_unknown
= _lttng_event_create(chan
, &ev
, filter
,
828 WARN_ON_ONCE(!chan
->sc_unknown
);
829 if (IS_ERR(chan
->sc_compat_unknown
)) {
830 return PTR_ERR(chan
->sc_compat_unknown
);
834 if (!chan
->compat_sc_exit_unknown
) {
835 const struct lttng_event_desc
*desc
=
836 &__event_desc___compat_syscall_exit_unknown
;
838 memset(&ev
, 0, sizeof(ev
));
839 strncpy(ev
.name
, desc
->name
, LTTNG_KERNEL_SYM_NAME_LEN
);
840 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
841 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
842 chan
->compat_sc_exit_unknown
= _lttng_event_create(chan
, &ev
,
845 WARN_ON_ONCE(!chan
->compat_sc_exit_unknown
);
846 if (IS_ERR(chan
->compat_sc_exit_unknown
)) {
847 return PTR_ERR(chan
->compat_sc_exit_unknown
);
851 if (!chan
->sc_exit_unknown
) {
852 const struct lttng_event_desc
*desc
=
853 &__event_desc___syscall_exit_unknown
;
855 memset(&ev
, 0, sizeof(ev
));
856 strncpy(ev
.name
, desc
->name
, LTTNG_KERNEL_SYM_NAME_LEN
);
857 ev
.name
[LTTNG_KERNEL_SYM_NAME_LEN
- 1] = '\0';
858 ev
.instrumentation
= LTTNG_KERNEL_SYSCALL
;
859 chan
->sc_exit_unknown
= _lttng_event_create(chan
, &ev
, filter
,
860 desc
, ev
.instrumentation
);
861 WARN_ON_ONCE(!chan
->sc_exit_unknown
);
862 if (IS_ERR(chan
->sc_exit_unknown
)) {
863 return PTR_ERR(chan
->sc_exit_unknown
);
867 ret
= fill_table(sc_table
, ARRAY_SIZE(sc_table
),
868 chan
->sc_table
, chan
, filter
, SC_TYPE_ENTRY
);
871 ret
= fill_table(sc_exit_table
, ARRAY_SIZE(sc_exit_table
),
872 chan
->sc_exit_table
, chan
, filter
, SC_TYPE_EXIT
);
877 ret
= fill_table(compat_sc_table
, ARRAY_SIZE(compat_sc_table
),
878 chan
->compat_sc_table
, chan
, filter
,
879 SC_TYPE_COMPAT_ENTRY
);
882 ret
= fill_table(compat_sc_exit_table
, ARRAY_SIZE(compat_sc_exit_table
),
883 chan
->compat_sc_exit_table
, chan
, filter
,
884 SC_TYPE_COMPAT_EXIT
);
888 if (!chan
->sys_enter_registered
) {
889 ret
= lttng_wrapper_tracepoint_probe_register("sys_enter",
890 (void *) syscall_entry_probe
, chan
);
893 chan
->sys_enter_registered
= 1;
896 * We change the name of sys_exit tracepoint due to namespace
897 * conflict with sys_exit syscall entry.
899 if (!chan
->sys_exit_registered
) {
900 ret
= lttng_wrapper_tracepoint_probe_register("sys_exit",
901 (void *) syscall_exit_probe
, chan
);
903 WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
904 (void *) syscall_entry_probe
, chan
));
907 chan
->sys_exit_registered
= 1;
913 * Only called at session destruction.
915 int lttng_syscalls_unregister(struct lttng_channel
*chan
)
921 if (chan
->sys_enter_registered
) {
922 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_enter",
923 (void *) syscall_entry_probe
, chan
);
926 chan
->sys_enter_registered
= 0;
928 if (chan
->sys_exit_registered
) {
929 ret
= lttng_wrapper_tracepoint_probe_unregister("sys_exit",
930 (void *) syscall_exit_probe
, chan
);
933 chan
->sys_exit_registered
= 0;
935 /* lttng_event destroy will be performed by lttng_session_destroy() */
936 kfree(chan
->sc_table
);
937 kfree(chan
->sc_exit_table
);
939 kfree(chan
->compat_sc_table
);
940 kfree(chan
->compat_sc_exit_table
);
942 kfree(chan
->sc_filter
);
947 int get_syscall_nr(const char *syscall_name
)
952 for (i
= 0; i
< ARRAY_SIZE(sc_table
); i
++) {
953 const struct trace_syscall_entry
*entry
;
956 entry
= &sc_table
[i
];
959 it_name
= entry
->desc
->name
;
960 it_name
+= strlen(SYSCALL_ENTRY_STR
);
961 if (!strcmp(syscall_name
, it_name
)) {
970 int get_compat_syscall_nr(const char *syscall_name
)
975 for (i
= 0; i
< ARRAY_SIZE(compat_sc_table
); i
++) {
976 const struct trace_syscall_entry
*entry
;
979 entry
= &compat_sc_table
[i
];
982 it_name
= entry
->desc
->name
;
983 it_name
+= strlen(COMPAT_SYSCALL_ENTRY_STR
);
984 if (!strcmp(syscall_name
, it_name
)) {
993 uint32_t get_sc_tables_len(void)
995 return ARRAY_SIZE(sc_table
) + ARRAY_SIZE(compat_sc_table
);
998 int lttng_syscall_filter_enable(struct lttng_channel
*chan
,
1001 int syscall_nr
, compat_syscall_nr
, ret
;
1002 struct lttng_syscall_filter
*filter
;
1004 WARN_ON_ONCE(!chan
->sc_table
);
1007 /* Enable all system calls by removing filter */
1008 if (chan
->sc_filter
) {
1009 filter
= chan
->sc_filter
;
1010 rcu_assign_pointer(chan
->sc_filter
, NULL
);
1011 synchronize_trace();
1014 chan
->syscall_all
= 1;
1018 if (!chan
->sc_filter
) {
1019 if (chan
->syscall_all
) {
1021 * All syscalls are already enabled.
1025 filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
1030 filter
= chan
->sc_filter
;
1032 syscall_nr
= get_syscall_nr(name
);
1033 compat_syscall_nr
= get_compat_syscall_nr(name
);
1034 if (syscall_nr
< 0 && compat_syscall_nr
< 0) {
1038 if (syscall_nr
>= 0) {
1039 if (test_bit(syscall_nr
, filter
->sc
)) {
1043 bitmap_set(filter
->sc
, syscall_nr
, 1);
1045 if (compat_syscall_nr
>= 0) {
1046 if (test_bit(compat_syscall_nr
, filter
->sc_compat
)) {
1050 bitmap_set(filter
->sc_compat
, compat_syscall_nr
, 1);
1052 if (!chan
->sc_filter
)
1053 rcu_assign_pointer(chan
->sc_filter
, filter
);
1057 if (!chan
->sc_filter
)
1062 int lttng_syscall_filter_disable(struct lttng_channel
*chan
,
1065 int syscall_nr
, compat_syscall_nr
, ret
;
1066 struct lttng_syscall_filter
*filter
;
1068 WARN_ON_ONCE(!chan
->sc_table
);
1070 if (!chan
->sc_filter
) {
1071 if (!chan
->syscall_all
)
1073 filter
= kzalloc(sizeof(struct lttng_syscall_filter
),
1077 /* Trace all system calls, then apply disable. */
1078 bitmap_set(filter
->sc
, 0, NR_syscalls
);
1079 bitmap_set(filter
->sc_compat
, 0, NR_compat_syscalls
);
1081 filter
= chan
->sc_filter
;
1085 /* Fail if all syscalls are already disabled. */
1086 if (bitmap_empty(filter
->sc
, NR_syscalls
)
1087 && bitmap_empty(filter
->sc_compat
,
1088 NR_compat_syscalls
)) {
1093 /* Disable all system calls */
1094 bitmap_clear(filter
->sc
, 0, NR_syscalls
);
1095 bitmap_clear(filter
->sc_compat
, 0, NR_compat_syscalls
);
1098 syscall_nr
= get_syscall_nr(name
);
1099 compat_syscall_nr
= get_compat_syscall_nr(name
);
1100 if (syscall_nr
< 0 && compat_syscall_nr
< 0) {
1104 if (syscall_nr
>= 0) {
1105 if (!test_bit(syscall_nr
, filter
->sc
)) {
1109 bitmap_clear(filter
->sc
, syscall_nr
, 1);
1111 if (compat_syscall_nr
>= 0) {
1112 if (!test_bit(compat_syscall_nr
, filter
->sc_compat
)) {
1116 bitmap_clear(filter
->sc_compat
, compat_syscall_nr
, 1);
1119 if (!chan
->sc_filter
)
1120 rcu_assign_pointer(chan
->sc_filter
, filter
);
1121 chan
->syscall_all
= 0;
1125 if (!chan
->sc_filter
)
1131 const struct trace_syscall_entry
*syscall_list_get_entry(loff_t
*pos
)
1133 const struct trace_syscall_entry
*entry
;
1136 for (entry
= sc_table
;
1137 entry
< sc_table
+ ARRAY_SIZE(sc_table
);
1142 for (entry
= compat_sc_table
;
1143 entry
< compat_sc_table
+ ARRAY_SIZE(compat_sc_table
);
1153 void *syscall_list_start(struct seq_file
*m
, loff_t
*pos
)
1155 return (void *) syscall_list_get_entry(pos
);
1159 void *syscall_list_next(struct seq_file
*m
, void *p
, loff_t
*ppos
)
1162 return (void *) syscall_list_get_entry(ppos
);
1166 void syscall_list_stop(struct seq_file
*m
, void *p
)
1171 int get_sc_table(const struct trace_syscall_entry
*entry
,
1172 const struct trace_syscall_entry
**table
,
1173 unsigned int *bitness
)
1175 if (entry
>= sc_table
&& entry
< sc_table
+ ARRAY_SIZE(sc_table
)) {
1177 *bitness
= BITS_PER_LONG
;
1182 if (!(entry
>= compat_sc_table
1183 && entry
< compat_sc_table
+ ARRAY_SIZE(compat_sc_table
))) {
1189 *table
= compat_sc_table
;
1194 int syscall_list_show(struct seq_file
*m
, void *p
)
1196 const struct trace_syscall_entry
*table
, *entry
= p
;
1197 unsigned int bitness
;
1198 unsigned long index
;
1202 ret
= get_sc_table(entry
, &table
, &bitness
);
1207 if (table
== sc_table
) {
1208 index
= entry
- table
;
1209 name
= &entry
->desc
->name
[strlen(SYSCALL_ENTRY_STR
)];
1211 index
= (entry
- table
) + ARRAY_SIZE(sc_table
);
1212 name
= &entry
->desc
->name
[strlen(COMPAT_SYSCALL_ENTRY_STR
)];
1214 seq_printf(m
, "syscall { index = %lu; name = %s; bitness = %u; };\n",
1215 index
, name
, bitness
);
1220 const struct seq_operations lttng_syscall_list_seq_ops
= {
1221 .start
= syscall_list_start
,
1222 .next
= syscall_list_next
,
1223 .stop
= syscall_list_stop
,
1224 .show
= syscall_list_show
,
1228 int lttng_syscall_list_open(struct inode
*inode
, struct file
*file
)
1230 return seq_open(file
, <tng_syscall_list_seq_ops
);
1233 const struct file_operations lttng_syscall_list_fops
= {
1234 .owner
= THIS_MODULE
,
1235 .open
= lttng_syscall_list_open
,
1237 .llseek
= seq_lseek
,
1238 .release
= seq_release
,
1241 long lttng_channel_syscall_mask(struct lttng_channel
*channel
,
1242 struct lttng_kernel_syscall_mask __user
*usyscall_mask
)
1244 uint32_t len
, sc_tables_len
, bitmask_len
;
1247 struct lttng_syscall_filter
*filter
;
1249 ret
= get_user(len
, &usyscall_mask
->len
);
1252 sc_tables_len
= get_sc_tables_len();
1253 bitmask_len
= ALIGN(sc_tables_len
, 8) >> 3;
1254 if (len
< sc_tables_len
) {
1255 return put_user(sc_tables_len
, &usyscall_mask
->len
);
1257 /* Array is large enough, we can copy array to user-space. */
1258 tmp_mask
= kzalloc(bitmask_len
, GFP_KERNEL
);
1261 filter
= channel
->sc_filter
;
1263 for (bit
= 0; bit
< ARRAY_SIZE(sc_table
); bit
++) {
1266 if (channel
->sc_table
) {
1268 state
= test_bit(bit
, filter
->sc
);
1274 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1276 for (; bit
< sc_tables_len
; bit
++) {
1279 if (channel
->compat_sc_table
) {
1281 state
= test_bit(bit
- ARRAY_SIZE(sc_table
),
1288 bt_bitfield_write_be(tmp_mask
, char, bit
, 1, state
);
1290 if (copy_to_user(usyscall_mask
->mask
, tmp_mask
, bitmask_len
))
1296 int lttng_abi_syscall_list(void)
1298 struct file
*syscall_list_file
;
1301 file_fd
= lttng_get_unused_fd();
1307 syscall_list_file
= anon_inode_getfile("[lttng_syscall_list]",
1308 <tng_syscall_list_fops
,
1310 if (IS_ERR(syscall_list_file
)) {
1311 ret
= PTR_ERR(syscall_list_file
);
1314 ret
= lttng_syscall_list_fops
.open(NULL
, syscall_list_file
);
1317 fd_install(file_fd
, syscall_list_file
);
1321 fput(syscall_list_file
);
1323 put_unused_fd(file_fd
);