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