Commit | Line | Data |
---|---|---|
259b6cb3 MD |
1 | /* |
2 | * lttng-syscalls.c | |
3 | * | |
2faf7d1b | 4 | * LTTng syscall probes. |
259b6cb3 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
259b6cb3 MD |
21 | */ |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/slab.h> | |
6333ace3 | 25 | #include <linux/compat.h> |
abc0446a | 26 | #include <linux/err.h> |
80f87dd2 | 27 | #include <linux/bitmap.h> |
259b6cb3 MD |
28 | #include <asm/ptrace.h> |
29 | #include <asm/syscall.h> | |
30 | ||
3a523f5b | 31 | #include "wrapper/tracepoint.h" |
a90917c3 | 32 | #include "lttng-events.h" |
259b6cb3 | 33 | |
6333ace3 | 34 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
35 | # ifndef is_compat_task |
36 | # define is_compat_task() (0) | |
37 | # endif | |
6333ace3 MD |
38 | #endif |
39 | ||
5b7ac358 MD |
40 | enum sc_type { |
41 | SC_TYPE_ENTRY, | |
42 | SC_TYPE_EXIT, | |
43 | SC_TYPE_COMPAT_ENTRY, | |
44 | SC_TYPE_COMPAT_EXIT, | |
45 | }; | |
46 | ||
47 | #define SYSCALL_ENTRY_STR "syscall_entry_" | |
48 | #define COMPAT_SYSCALL_ENTRY_STR "compat_syscall_entry_" | |
49 | #define SYSCALL_EXIT_STR "syscall_exit_" | |
50 | #define COMPAT_SYSCALL_EXIT_STR "compat_syscall_exit_" | |
51 | ||
a93244f8 | 52 | static |
2faf7d1b | 53 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
54 | static |
55 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 56 | |
3a523f5b MD |
57 | /* |
58 | * Forward declarations for old kernels. | |
59 | */ | |
60 | struct mmsghdr; | |
61 | struct rlimit64; | |
62 | struct oldold_utsname; | |
63 | struct old_utsname; | |
64 | struct sel_arg_struct; | |
65 | struct mmap_arg_struct; | |
66 | ||
80f87dd2 MD |
67 | #ifdef IA32_NR_syscalls |
68 | #define NR_compat_syscalls IA32_NR_syscalls | |
69 | #else | |
70 | #define NR_compat_syscalls NR_syscalls | |
71 | #endif | |
72 | ||
f7bdf4db MD |
73 | /* |
74 | * Take care of NOARGS not supported by mainline. | |
75 | */ | |
76 | #define DECLARE_EVENT_CLASS_NOARGS(name, tstruct, assign, print) | |
77 | #define DEFINE_EVENT_NOARGS(template, name) | |
78 | #define TRACE_EVENT_NOARGS(name, struct, assign, print) | |
79 | ||
259b6cb3 MD |
80 | /* |
81 | * Create LTTng tracepoint probes. | |
82 | */ | |
83 | #define LTTNG_PACKAGE_BUILD | |
84 | #define CREATE_TRACE_POINTS | |
2655f9ad | 85 | #define TP_MODULE_NOINIT |
2f804c0a | 86 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 87 | |
a93244f8 MD |
88 | #define PARAMS(args...) args |
89 | ||
5b7ac358 MD |
90 | /* Handle unknown syscalls */ |
91 | #define TRACE_SYSTEM syscalls_unknown | |
92 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
93 | #undef TRACE_SYSTEM | |
94 | ||
fc4f7161 MD |
95 | #define SC_ENTER |
96 | ||
97 | #undef SC_EXIT_PROTO | |
98 | #define SC_EXIT_PROTO(...) | |
99 | #undef SC_EXIT_ARGS | |
100 | #define SC_EXIT_ARGS(...) | |
101 | #undef sc_exit | |
102 | #define sc_exit(...) | |
5b7ac358 MD |
103 | |
104 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 105 | #undef TP_PROBE_CB |
259b6cb3 | 106 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
a93244f8 | 107 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
5b7ac358 | 108 | TRACE_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args),\ |
a93244f8 MD |
109 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
110 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ | |
5b7ac358 | 111 | DECLARE_EVENT_CLASS_NOARGS(syscall_enter_##_name, PARAMS(_struct), PARAMS(_assign),\ |
a93244f8 MD |
112 | PARAMS(_printk)) |
113 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
5b7ac358 | 114 | DEFINE_EVENT_NOARGS(syscall_enter_##_template, syscall_enter_##_name) |
a93244f8 | 115 | #undef TRACE_SYSTEM |
5b7ac358 MD |
116 | #define TRACE_SYSTEM syscall_enter_integers |
117 | #define TRACE_INCLUDE_FILE syscalls_integers | |
177b3692 | 118 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 119 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 120 | #undef TRACE_SYSTEM |
5b7ac358 MD |
121 | #define TRACE_SYSTEM syscall_enter_pointers |
122 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
177b3692 | 123 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 124 | #undef TRACE_INCLUDE_FILE |
a93244f8 MD |
125 | #undef TRACE_SYSTEM |
126 | #undef SC_TRACE_EVENT | |
127 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
128 | #undef SC_DEFINE_EVENT_NOARGS | |
5b7ac358 | 129 | #undef TP_PROBE_CB |
a93244f8 MD |
130 | #undef _TRACE_SYSCALLS_integers_H |
131 | #undef _TRACE_SYSCALLS_pointers_H | |
132 | ||
5b7ac358 MD |
133 | |
134 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 MD |
135 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
136 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
5b7ac358 | 137 | TRACE_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 MD |
138 | PARAMS(_struct), PARAMS(_assign), \ |
139 | PARAMS(_printk)) | |
140 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ | |
5b7ac358 MD |
141 | DECLARE_EVENT_CLASS_NOARGS(compat_syscall_enter_##_name, PARAMS(_struct), \ |
142 | PARAMS(_assign), PARAMS(_printk)) | |
143 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
144 | DEFINE_EVENT_NOARGS(compat_syscall_enter_##_template, \ | |
145 | compat_syscall_enter_##_name) | |
146 | #define TRACE_SYSTEM compat_syscall_enter_integers | |
147 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
148 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
149 | #undef TRACE_INCLUDE_FILE | |
150 | #undef TRACE_SYSTEM | |
151 | #define TRACE_SYSTEM compat_syscall_enter_pointers | |
152 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
153 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
154 | #undef TRACE_INCLUDE_FILE | |
155 | #undef TRACE_SYSTEM | |
156 | #undef SC_TRACE_EVENT | |
157 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
158 | #undef SC_DEFINE_EVENT_NOARGS | |
159 | #undef TP_PROBE_CB | |
160 | #undef _TRACE_SYSCALLS_integers_H | |
161 | #undef _TRACE_SYSCALLS_pointers_H | |
162 | ||
fc4f7161 MD |
163 | #undef SC_ENTER |
164 | ||
165 | #define SC_EXIT | |
166 | ||
167 | #undef SC_EXIT_PROTO | |
168 | #define SC_EXIT_PROTO(...) __VA_ARGS__ | |
169 | #undef SC_EXIT_ARGS | |
170 | #define SC_EXIT_ARGS(...) __VA_ARGS__ | |
171 | #undef sc_exit | |
172 | #define sc_exit(...) __VA_ARGS__ | |
5b7ac358 MD |
173 | |
174 | /* Hijack probe callback for system call exit */ | |
175 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
176 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
177 | TRACE_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args),\ | |
178 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
179 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ | |
180 | DECLARE_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \ | |
181 | PARAMS(_assign), PARAMS(_printk)) | |
182 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
183 | DEFINE_EVENT_NOARGS(syscall_exit_##_template, \ | |
184 | syscall_exit_##_name) | |
185 | #define TRACE_SYSTEM syscall_exit_integers | |
186 | #define TRACE_INCLUDE_FILE syscalls_integers | |
187 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
188 | #undef TRACE_INCLUDE_FILE | |
189 | #undef TRACE_SYSTEM | |
190 | #define TRACE_SYSTEM syscall_exit_pointers | |
191 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
192 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
193 | #undef TRACE_INCLUDE_FILE | |
194 | #undef TRACE_SYSTEM | |
195 | #undef SC_TRACE_EVENT | |
196 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
197 | #undef SC_DEFINE_EVENT_NOARGS | |
198 | #undef TP_PROBE_CB | |
199 | #undef _TRACE_SYSCALLS_integers_H | |
200 | #undef _TRACE_SYSCALLS_pointers_H | |
201 | ||
202 | ||
203 | /* Hijack probe callback for compat system call exit */ | |
204 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
205 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
206 | TRACE_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ | |
207 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
208 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ | |
209 | DECLARE_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \ | |
a93244f8 MD |
210 | PARAMS(_assign), PARAMS(_printk)) |
211 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
5b7ac358 MD |
212 | DEFINE_EVENT_NOARGS(compat_syscall_exit_##_template, \ |
213 | compat_syscall_exit_##_name) | |
214 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
215 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 216 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 217 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 218 | #undef TRACE_SYSTEM |
5b7ac358 MD |
219 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
220 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 221 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 222 | #undef TRACE_INCLUDE_FILE |
a93244f8 MD |
223 | #undef TRACE_SYSTEM |
224 | #undef SC_TRACE_EVENT | |
225 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
226 | #undef SC_DEFINE_EVENT_NOARGS | |
227 | #undef TP_PROBE_CB | |
5b7ac358 MD |
228 | #undef _TRACE_SYSCALLS_integers_H |
229 | #undef _TRACE_SYSCALLS_pointers_H | |
230 | ||
fc4f7161 | 231 | #undef SC_EXIT |
259b6cb3 | 232 | |
2655f9ad | 233 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
234 | #undef LTTNG_PACKAGE_BUILD |
235 | #undef CREATE_TRACE_POINTS | |
236 | ||
a93244f8 MD |
237 | struct trace_syscall_entry { |
238 | void *func; | |
239 | const struct lttng_event_desc *desc; | |
240 | const struct lttng_event_field *fields; | |
241 | unsigned int nrargs; | |
242 | }; | |
243 | ||
244 | #define CREATE_SYSCALL_TABLE | |
245 | ||
fc4f7161 MD |
246 | #define SC_ENTER |
247 | ||
248 | #undef sc_exit | |
249 | #define sc_exit(...) | |
250 | ||
259b6cb3 | 251 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 252 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 253 | [ _nr ] = { \ |
5b7ac358 | 254 | .func = __event_probe__syscall_enter_##_template, \ |
259b6cb3 | 255 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
256 | .fields = __event_fields___syscall_enter_##_template, \ |
257 | .desc = &__event_desc___syscall_enter_##_name, \ | |
259b6cb3 MD |
258 | }, |
259 | ||
5b7ac358 | 260 | /* Syscall enter tracing table */ |
49c50022 | 261 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
262 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
263 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
264 | }; |
265 | ||
a93244f8 MD |
266 | #undef TRACE_SYSCALL_TABLE |
267 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
268 | [ _nr ] = { \ | |
5b7ac358 | 269 | .func = __event_probe__compat_syscall_enter_##_template, \ |
a93244f8 | 270 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
271 | .fields = __event_fields___compat_syscall_enter_##_template, \ |
272 | .desc = &__event_desc___compat_syscall_enter_##_name, \ | |
a93244f8 MD |
273 | }, |
274 | ||
5b7ac358 | 275 | /* Compat syscall enter table */ |
a93244f8 MD |
276 | const struct trace_syscall_entry compat_sc_table[] = { |
277 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
278 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
279 | }; | |
259b6cb3 | 280 | |
fc4f7161 MD |
281 | #undef SC_ENTER |
282 | ||
283 | #define SC_EXIT | |
284 | ||
285 | #undef sc_exit | |
286 | #define sc_exit(...) __VA_ARGS__ | |
287 | ||
5b7ac358 MD |
288 | #undef TRACE_SYSCALL_TABLE |
289 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
290 | [ _nr ] = { \ | |
291 | .func = __event_probe__syscall_exit_##_template, \ | |
292 | .nrargs = (_nrargs), \ | |
293 | .fields = __event_fields___syscall_exit_##_template, \ | |
294 | .desc = &__event_desc___syscall_exit_##_name, \ | |
295 | }, | |
296 | ||
297 | /* Syscall exit table */ | |
298 | static const struct trace_syscall_entry sc_exit_table[] = { | |
299 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
300 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
301 | }; | |
302 | ||
303 | #undef TRACE_SYSCALL_TABLE | |
304 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
305 | [ _nr ] = { \ | |
306 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
307 | .nrargs = (_nrargs), \ | |
308 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
309 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
310 | }, | |
311 | ||
312 | /* Compat syscall exit table */ | |
313 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
314 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
315 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
316 | }; | |
317 | ||
fc4f7161 MD |
318 | #undef SC_EXIT |
319 | ||
a93244f8 | 320 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 321 | |
80f87dd2 MD |
322 | struct lttng_syscall_filter { |
323 | DECLARE_BITMAP(sc, NR_syscalls); | |
324 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
325 | }; | |
326 | ||
a90917c3 | 327 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
328 | struct pt_regs *regs, unsigned int id) |
329 | { | |
330 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 331 | |
f405cfce | 332 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 333 | if (unlikely(is_compat_task())) |
5b7ac358 | 334 | __event_probe__compat_syscall_enter_unknown(event, id, args); |
a93244f8 | 335 | else |
5b7ac358 | 336 | __event_probe__syscall_enter_unknown(event, id, args); |
f405cfce MD |
337 | } |
338 | ||
2faf7d1b | 339 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 340 | { |
a90917c3 MD |
341 | struct lttng_channel *chan = __data; |
342 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
343 | const struct trace_syscall_entry *table, *entry; |
344 | size_t table_len; | |
259b6cb3 | 345 | |
b76dc1a0 | 346 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
347 | struct lttng_syscall_filter *filter; |
348 | ||
349 | filter = rcu_dereference(chan->sc_filter); | |
350 | if (filter) { | |
351 | if (id >= NR_compat_syscalls | |
352 | || !test_bit(id, filter->sc_compat)) { | |
353 | /* System call filtered out. */ | |
354 | return; | |
355 | } | |
356 | } | |
49c50022 | 357 | table = compat_sc_table; |
a93244f8 | 358 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
359 | unknown_event = chan->sc_compat_unknown; |
360 | } else { | |
80f87dd2 MD |
361 | struct lttng_syscall_filter *filter; |
362 | ||
363 | filter = rcu_dereference(chan->sc_filter); | |
364 | if (filter) { | |
365 | if (id >= NR_syscalls | |
366 | || !test_bit(id, filter->sc)) { | |
367 | /* System call filtered out. */ | |
368 | return; | |
369 | } | |
370 | } | |
49c50022 MD |
371 | table = sc_table; |
372 | table_len = ARRAY_SIZE(sc_table); | |
373 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 374 | } |
49c50022 MD |
375 | if (unlikely(id >= table_len)) { |
376 | syscall_entry_unknown(unknown_event, regs, id); | |
259b6cb3 | 377 | return; |
f405cfce | 378 | } |
49c50022 MD |
379 | if (unlikely(is_compat_task())) |
380 | event = chan->compat_sc_table[id]; | |
381 | else | |
382 | event = chan->sc_table[id]; | |
f405cfce | 383 | if (unlikely(!event)) { |
49c50022 | 384 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
385 | return; |
386 | } | |
49c50022 | 387 | entry = &table[id]; |
f405cfce | 388 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
389 | |
390 | switch (entry->nrargs) { | |
391 | case 0: | |
392 | { | |
393 | void (*fptr)(void *__data) = entry->func; | |
394 | ||
395 | fptr(event); | |
396 | break; | |
397 | } | |
398 | case 1: | |
399 | { | |
400 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
401 | unsigned long args[1]; | |
402 | ||
403 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
404 | fptr(event, args[0]); | |
405 | break; | |
406 | } | |
407 | case 2: | |
408 | { | |
409 | void (*fptr)(void *__data, | |
410 | unsigned long arg0, | |
411 | unsigned long arg1) = entry->func; | |
412 | unsigned long args[2]; | |
413 | ||
414 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
415 | fptr(event, args[0], args[1]); | |
416 | break; | |
417 | } | |
418 | case 3: | |
419 | { | |
420 | void (*fptr)(void *__data, | |
421 | unsigned long arg0, | |
422 | unsigned long arg1, | |
423 | unsigned long arg2) = entry->func; | |
424 | unsigned long args[3]; | |
425 | ||
426 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
427 | fptr(event, args[0], args[1], args[2]); | |
428 | break; | |
429 | } | |
430 | case 4: | |
431 | { | |
432 | void (*fptr)(void *__data, | |
433 | unsigned long arg0, | |
434 | unsigned long arg1, | |
435 | unsigned long arg2, | |
436 | unsigned long arg3) = entry->func; | |
437 | unsigned long args[4]; | |
438 | ||
439 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
440 | fptr(event, args[0], args[1], args[2], args[3]); | |
441 | break; | |
442 | } | |
443 | case 5: | |
444 | { | |
445 | void (*fptr)(void *__data, | |
446 | unsigned long arg0, | |
447 | unsigned long arg1, | |
448 | unsigned long arg2, | |
449 | unsigned long arg3, | |
450 | unsigned long arg4) = entry->func; | |
451 | unsigned long args[5]; | |
452 | ||
453 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
454 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
455 | break; | |
456 | } | |
457 | case 6: | |
458 | { | |
459 | void (*fptr)(void *__data, | |
460 | unsigned long arg0, | |
461 | unsigned long arg1, | |
462 | unsigned long arg2, | |
463 | unsigned long arg3, | |
464 | unsigned long arg4, | |
465 | unsigned long arg5) = entry->func; | |
466 | unsigned long args[6]; | |
467 | ||
468 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
469 | fptr(event, args[0], args[1], args[2], | |
470 | args[3], args[4], args[5]); | |
471 | break; | |
472 | } | |
473 | default: | |
474 | break; | |
475 | } | |
476 | } | |
477 | ||
5b7ac358 MD |
478 | static void syscall_exit_unknown(struct lttng_event *event, |
479 | struct pt_regs *regs, unsigned int id, long ret) | |
480 | { | |
481 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
482 | ||
483 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
484 | if (unlikely(is_compat_task())) | |
485 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
486 | args); | |
487 | else | |
488 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
489 | } | |
490 | ||
491 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
492 | { | |
493 | struct lttng_channel *chan = __data; | |
494 | struct lttng_event *event, *unknown_event; | |
495 | const struct trace_syscall_entry *table, *entry; | |
496 | size_t table_len; | |
497 | long id; | |
498 | ||
499 | id = syscall_get_nr(current, regs); | |
500 | if (unlikely(is_compat_task())) { | |
501 | struct lttng_syscall_filter *filter; | |
502 | ||
503 | filter = rcu_dereference(chan->sc_filter); | |
504 | if (filter) { | |
505 | if (id >= NR_compat_syscalls | |
506 | || !test_bit(id, filter->sc_compat)) { | |
507 | /* System call filtered out. */ | |
508 | return; | |
509 | } | |
510 | } | |
511 | table = compat_sc_exit_table; | |
512 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
513 | unknown_event = chan->compat_sc_exit_unknown; | |
514 | } else { | |
515 | struct lttng_syscall_filter *filter; | |
516 | ||
517 | filter = rcu_dereference(chan->sc_filter); | |
518 | if (filter) { | |
519 | if (id >= NR_syscalls | |
520 | || !test_bit(id, filter->sc)) { | |
521 | /* System call filtered out. */ | |
522 | return; | |
523 | } | |
524 | } | |
525 | table = sc_exit_table; | |
526 | table_len = ARRAY_SIZE(sc_exit_table); | |
527 | unknown_event = chan->sc_exit_unknown; | |
528 | } | |
529 | if (unlikely(id >= table_len)) { | |
530 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
531 | return; | |
532 | } | |
533 | if (unlikely(is_compat_task())) | |
534 | event = chan->compat_sc_exit_table[id]; | |
535 | else | |
536 | event = chan->sc_exit_table[id]; | |
537 | if (unlikely(!event)) { | |
538 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
539 | return; | |
540 | } | |
541 | entry = &table[id]; | |
542 | WARN_ON_ONCE(!entry); | |
543 | ||
544 | switch (entry->nrargs) { | |
545 | case 0: | |
546 | { | |
fc4f7161 | 547 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 548 | |
fc4f7161 | 549 | fptr(event, ret); |
5b7ac358 MD |
550 | break; |
551 | } | |
552 | case 1: | |
553 | { | |
554 | void (*fptr)(void *__data, | |
fc4f7161 | 555 | long ret, |
5b7ac358 MD |
556 | unsigned long arg0) = entry->func; |
557 | unsigned long args[1]; | |
558 | ||
559 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 560 | fptr(event, ret, args[0]); |
5b7ac358 MD |
561 | break; |
562 | } | |
563 | case 2: | |
564 | { | |
565 | void (*fptr)(void *__data, | |
fc4f7161 | 566 | long ret, |
5b7ac358 MD |
567 | unsigned long arg0, |
568 | unsigned long arg1) = entry->func; | |
569 | unsigned long args[2]; | |
570 | ||
571 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 572 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
573 | break; |
574 | } | |
575 | case 3: | |
576 | { | |
577 | void (*fptr)(void *__data, | |
fc4f7161 | 578 | long ret, |
5b7ac358 MD |
579 | unsigned long arg0, |
580 | unsigned long arg1, | |
581 | unsigned long arg2) = entry->func; | |
582 | unsigned long args[3]; | |
583 | ||
584 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 585 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
586 | break; |
587 | } | |
588 | case 4: | |
589 | { | |
590 | void (*fptr)(void *__data, | |
fc4f7161 | 591 | long ret, |
5b7ac358 MD |
592 | unsigned long arg0, |
593 | unsigned long arg1, | |
594 | unsigned long arg2, | |
595 | unsigned long arg3) = entry->func; | |
596 | unsigned long args[4]; | |
597 | ||
598 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 599 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
600 | break; |
601 | } | |
602 | case 5: | |
603 | { | |
604 | void (*fptr)(void *__data, | |
fc4f7161 | 605 | long ret, |
5b7ac358 MD |
606 | unsigned long arg0, |
607 | unsigned long arg1, | |
608 | unsigned long arg2, | |
609 | unsigned long arg3, | |
610 | unsigned long arg4) = entry->func; | |
611 | unsigned long args[5]; | |
612 | ||
613 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 614 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
615 | break; |
616 | } | |
617 | case 6: | |
618 | { | |
619 | void (*fptr)(void *__data, | |
fc4f7161 | 620 | long ret, |
5b7ac358 MD |
621 | unsigned long arg0, |
622 | unsigned long arg1, | |
623 | unsigned long arg2, | |
624 | unsigned long arg3, | |
625 | unsigned long arg4, | |
626 | unsigned long arg5) = entry->func; | |
627 | unsigned long args[6]; | |
628 | ||
629 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 630 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
631 | args[3], args[4], args[5]); |
632 | break; | |
633 | } | |
634 | default: | |
635 | break; | |
636 | } | |
637 | } | |
638 | ||
2a0c4816 | 639 | /* noinline to diminish caller stack size */ |
49c50022 MD |
640 | static |
641 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
642 | struct lttng_event **chan_table, struct lttng_channel *chan, |
643 | void *filter, enum sc_type type) | |
259b6cb3 | 644 | { |
2a0c4816 | 645 | const struct lttng_event_desc *desc; |
259b6cb3 | 646 | unsigned int i; |
49c50022 MD |
647 | |
648 | /* Allocate events for each syscall, insert into table */ | |
649 | for (i = 0; i < table_len; i++) { | |
650 | struct lttng_kernel_event ev; | |
2a0c4816 | 651 | desc = table[i].desc; |
49c50022 MD |
652 | |
653 | if (!desc) { | |
654 | /* Unknown syscall */ | |
655 | continue; | |
656 | } | |
657 | /* | |
658 | * Skip those already populated by previous failed | |
659 | * register for this channel. | |
660 | */ | |
661 | if (chan_table[i]) | |
662 | continue; | |
663 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
664 | switch (type) { |
665 | case SC_TYPE_ENTRY: | |
666 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
667 | LTTNG_KERNEL_SYM_NAME_LEN); | |
668 | break; | |
669 | case SC_TYPE_EXIT: | |
670 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
671 | LTTNG_KERNEL_SYM_NAME_LEN); | |
672 | break; | |
673 | case SC_TYPE_COMPAT_ENTRY: | |
674 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
675 | LTTNG_KERNEL_SYM_NAME_LEN); | |
676 | break; | |
677 | case SC_TYPE_COMPAT_EXIT: | |
678 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
679 | LTTNG_KERNEL_SYM_NAME_LEN); | |
680 | break; | |
681 | default: | |
682 | BUG_ON(1); | |
683 | break; | |
684 | } | |
685 | strncat(ev.name, desc->name, | |
686 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 687 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
49c50022 | 688 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 689 | chan_table[i] = lttng_event_create(chan, &ev, filter, |
49c50022 | 690 | desc); |
abc0446a MD |
691 | WARN_ON_ONCE(!chan_table[i]); |
692 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
693 | /* |
694 | * If something goes wrong in event registration | |
695 | * after the first one, we have no choice but to | |
696 | * leave the previous events in there, until | |
697 | * deleted by session teardown. | |
698 | */ | |
abc0446a | 699 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
700 | } |
701 | } | |
702 | return 0; | |
703 | } | |
704 | ||
a90917c3 | 705 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 706 | { |
2a0c4816 | 707 | struct lttng_kernel_event ev; |
259b6cb3 MD |
708 | int ret; |
709 | ||
710 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
711 | |
712 | if (!chan->sc_table) { | |
713 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 714 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
715 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
716 | if (!chan->sc_table) | |
717 | return -ENOMEM; | |
718 | } | |
5b7ac358 MD |
719 | if (!chan->sc_exit_table) { |
720 | /* create syscall table mapping syscall to events */ | |
721 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
722 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
723 | if (!chan->sc_exit_table) | |
724 | return -ENOMEM; | |
725 | } | |
726 | ||
259b6cb3 | 727 | |
49c50022 MD |
728 | #ifdef CONFIG_COMPAT |
729 | if (!chan->compat_sc_table) { | |
730 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 731 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 732 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
733 | if (!chan->compat_sc_table) |
734 | return -ENOMEM; | |
735 | } | |
5b7ac358 MD |
736 | |
737 | if (!chan->compat_sc_exit_table) { | |
738 | /* create syscall table mapping compat syscall to events */ | |
739 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
740 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
741 | if (!chan->compat_sc_exit_table) | |
742 | return -ENOMEM; | |
743 | } | |
49c50022 | 744 | #endif |
f405cfce | 745 | if (!chan->sc_unknown) { |
f405cfce | 746 | const struct lttng_event_desc *desc = |
5b7ac358 | 747 | &__event_desc___syscall_enter_unknown; |
2f804c0a | 748 | |
f405cfce | 749 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
750 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
751 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f405cfce | 752 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 753 | chan->sc_unknown = lttng_event_create(chan, &ev, filter, |
f405cfce | 754 | desc); |
abc0446a MD |
755 | WARN_ON_ONCE(!chan->sc_unknown); |
756 | if (IS_ERR(chan->sc_unknown)) { | |
757 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
758 | } |
759 | } | |
760 | ||
b76dc1a0 | 761 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 762 | const struct lttng_event_desc *desc = |
5b7ac358 | 763 | &__event_desc___compat_syscall_enter_unknown; |
b76dc1a0 MD |
764 | |
765 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
766 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
767 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
b76dc1a0 | 768 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 769 | chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter, |
b76dc1a0 | 770 | desc); |
abc0446a MD |
771 | WARN_ON_ONCE(!chan->sc_unknown); |
772 | if (IS_ERR(chan->sc_compat_unknown)) { | |
773 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
774 | } |
775 | } | |
776 | ||
5b7ac358 | 777 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 778 | const struct lttng_event_desc *desc = |
5b7ac358 | 779 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
780 | |
781 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
782 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
783 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2f804c0a | 784 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
5b7ac358 MD |
785 | chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev, |
786 | filter, desc); | |
787 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); | |
788 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
789 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
790 | } | |
791 | } | |
792 | ||
793 | if (!chan->sc_exit_unknown) { | |
794 | const struct lttng_event_desc *desc = | |
795 | &__event_desc___syscall_exit_unknown; | |
796 | ||
797 | memset(&ev, 0, sizeof(ev)); | |
798 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
799 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
800 | ev.instrumentation = LTTNG_KERNEL_NOOP; | |
801 | chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter, | |
2f804c0a | 802 | desc); |
5b7ac358 MD |
803 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
804 | if (IS_ERR(chan->sc_exit_unknown)) { | |
805 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
806 | } |
807 | } | |
808 | ||
49c50022 | 809 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
810 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
811 | if (ret) | |
812 | return ret; | |
813 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
814 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
815 | if (ret) |
816 | return ret; | |
5b7ac358 | 817 | |
49c50022 | 818 | #ifdef CONFIG_COMPAT |
a93244f8 | 819 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
820 | chan->compat_sc_table, chan, filter, |
821 | SC_TYPE_COMPAT_ENTRY); | |
822 | if (ret) | |
823 | return ret; | |
824 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
825 | chan->compat_sc_exit_table, chan, filter, | |
826 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
827 | if (ret) |
828 | return ret; | |
829 | #endif | |
80f87dd2 MD |
830 | if (!chan->sys_enter_registered) { |
831 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
832 | (void *) syscall_entry_probe, chan); | |
833 | if (ret) | |
834 | return ret; | |
835 | chan->sys_enter_registered = 1; | |
836 | } | |
63728b02 MD |
837 | /* |
838 | * We change the name of sys_exit tracepoint due to namespace | |
839 | * conflict with sys_exit syscall entry. | |
840 | */ | |
80f87dd2 MD |
841 | if (!chan->sys_exit_registered) { |
842 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 843 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
844 | if (ret) { |
845 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
846 | (void *) syscall_entry_probe, chan)); | |
847 | return ret; | |
848 | } | |
849 | chan->sys_exit_registered = 1; | |
63728b02 | 850 | } |
259b6cb3 MD |
851 | return ret; |
852 | } | |
853 | ||
854 | /* | |
855 | * Only called at session destruction. | |
856 | */ | |
a90917c3 | 857 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
858 | { |
859 | int ret; | |
860 | ||
861 | if (!chan->sc_table) | |
862 | return 0; | |
80f87dd2 MD |
863 | if (chan->sys_enter_registered) { |
864 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 865 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
866 | if (ret) |
867 | return ret; | |
868 | chan->sys_enter_registered = 0; | |
869 | } | |
870 | if (chan->sys_exit_registered) { | |
871 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
872 | (void *) syscall_entry_probe, chan); | |
873 | if (ret) | |
874 | return ret; | |
875 | chan->sys_exit_registered = 0; | |
876 | } | |
a90917c3 | 877 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 878 | kfree(chan->sc_table); |
5b7ac358 | 879 | kfree(chan->sc_exit_table); |
49c50022 MD |
880 | #ifdef CONFIG_COMPAT |
881 | kfree(chan->compat_sc_table); | |
5b7ac358 | 882 | kfree(chan->compat_sc_exit_table); |
49c50022 | 883 | #endif |
80f87dd2 MD |
884 | kfree(chan->sc_filter); |
885 | return 0; | |
886 | } | |
887 | ||
888 | static | |
889 | int get_syscall_nr(const char *syscall_name) | |
890 | { | |
891 | int syscall_nr = -1; | |
892 | int i; | |
893 | ||
894 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
895 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 896 | const char *it_name; |
80f87dd2 MD |
897 | |
898 | entry = &sc_table[i]; | |
899 | if (!entry->desc) | |
900 | continue; | |
5b7ac358 MD |
901 | it_name = entry->desc->name; |
902 | it_name += strlen(SYSCALL_ENTRY_STR); | |
903 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
904 | syscall_nr = i; |
905 | break; | |
906 | } | |
907 | } | |
908 | return syscall_nr; | |
909 | } | |
910 | ||
911 | static | |
912 | int get_compat_syscall_nr(const char *syscall_name) | |
913 | { | |
914 | int syscall_nr = -1; | |
915 | int i; | |
916 | ||
917 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
918 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 919 | const char *it_name; |
80f87dd2 MD |
920 | |
921 | entry = &compat_sc_table[i]; | |
922 | if (!entry->desc) | |
923 | continue; | |
5b7ac358 MD |
924 | it_name = entry->desc->name; |
925 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
926 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
927 | syscall_nr = i; |
928 | break; | |
929 | } | |
930 | } | |
931 | return syscall_nr; | |
932 | } | |
933 | ||
934 | int lttng_syscall_filter_enable(struct lttng_channel *chan, | |
935 | const char *name) | |
936 | { | |
937 | int syscall_nr, compat_syscall_nr, ret; | |
938 | struct lttng_syscall_filter *filter; | |
939 | ||
940 | WARN_ON_ONCE(!chan->sc_table); | |
941 | ||
942 | if (!name) { | |
943 | /* Enable all system calls by removing filter */ | |
944 | if (chan->sc_filter) { | |
945 | filter = chan->sc_filter; | |
946 | rcu_assign_pointer(chan->sc_filter, NULL); | |
947 | synchronize_trace(); | |
948 | kfree(filter); | |
949 | } | |
950 | chan->syscall_all = 1; | |
951 | return 0; | |
952 | } | |
953 | ||
954 | if (!chan->sc_filter) { | |
955 | if (chan->syscall_all) { | |
956 | /* | |
957 | * All syscalls are already enabled. | |
958 | */ | |
959 | return -EEXIST; | |
960 | } | |
961 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
962 | GFP_KERNEL); | |
963 | if (!filter) | |
964 | return -ENOMEM; | |
965 | } else { | |
966 | filter = chan->sc_filter; | |
967 | } | |
968 | syscall_nr = get_syscall_nr(name); | |
969 | compat_syscall_nr = get_compat_syscall_nr(name); | |
970 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
971 | ret = -ENOENT; | |
972 | goto error; | |
973 | } | |
974 | if (syscall_nr >= 0) { | |
975 | if (test_bit(syscall_nr, filter->sc)) { | |
976 | ret = -EEXIST; | |
977 | goto error; | |
978 | } | |
979 | bitmap_set(filter->sc, syscall_nr, 1); | |
980 | } | |
981 | if (compat_syscall_nr >= 0) { | |
982 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
983 | ret = -EEXIST; | |
984 | goto error; | |
985 | } | |
986 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
987 | } | |
988 | if (!chan->sc_filter) | |
989 | rcu_assign_pointer(chan->sc_filter, filter); | |
990 | return 0; | |
991 | ||
992 | error: | |
993 | if (!chan->sc_filter) | |
994 | kfree(filter); | |
995 | return ret; | |
996 | } | |
997 | ||
998 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
999 | const char *name) | |
1000 | { | |
1001 | int syscall_nr, compat_syscall_nr, ret; | |
1002 | struct lttng_syscall_filter *filter; | |
1003 | ||
1004 | WARN_ON_ONCE(!chan->sc_table); | |
1005 | ||
1006 | if (!chan->sc_filter) { | |
1007 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1008 | GFP_KERNEL); | |
1009 | if (!filter) | |
1010 | return -ENOMEM; | |
1011 | /* Trace all system calls, then apply disable. */ | |
1012 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1013 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1014 | } else { | |
1015 | filter = chan->sc_filter; | |
1016 | } | |
1017 | ||
1018 | syscall_nr = get_syscall_nr(name); | |
1019 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1020 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1021 | ret = -ENOENT; | |
1022 | goto error; | |
1023 | } | |
1024 | if (syscall_nr >= 0) { | |
1025 | if (!test_bit(syscall_nr, chan->sc_filter->sc)) { | |
1026 | ret = -EEXIST; | |
1027 | goto error; | |
1028 | } | |
1029 | bitmap_clear(chan->sc_filter->sc, syscall_nr, 1); | |
1030 | } | |
1031 | if (compat_syscall_nr >= 0) { | |
1032 | if (!test_bit(compat_syscall_nr, chan->sc_filter->sc_compat)) { | |
1033 | ret = -EEXIST; | |
1034 | goto error; | |
1035 | } | |
1036 | bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1); | |
1037 | } | |
1038 | if (!chan->sc_filter) | |
1039 | rcu_assign_pointer(chan->sc_filter, filter); | |
1040 | chan->syscall_all = 0; | |
259b6cb3 | 1041 | return 0; |
80f87dd2 MD |
1042 | |
1043 | error: | |
1044 | if (!chan->sc_filter) | |
1045 | kfree(filter); | |
1046 | return ret; | |
259b6cb3 | 1047 | } |