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> |
7ca580f8 MD |
28 | #include <linux/in.h> |
29 | #include <linux/in6.h> | |
259b6cb3 MD |
30 | #include <asm/ptrace.h> |
31 | #include <asm/syscall.h> | |
32 | ||
3a523f5b | 33 | #include "wrapper/tracepoint.h" |
a90917c3 | 34 | #include "lttng-events.h" |
259b6cb3 | 35 | |
6333ace3 | 36 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
37 | # ifndef is_compat_task |
38 | # define is_compat_task() (0) | |
39 | # endif | |
6333ace3 MD |
40 | #endif |
41 | ||
5b7ac358 MD |
42 | enum sc_type { |
43 | SC_TYPE_ENTRY, | |
44 | SC_TYPE_EXIT, | |
45 | SC_TYPE_COMPAT_ENTRY, | |
46 | SC_TYPE_COMPAT_EXIT, | |
47 | }; | |
48 | ||
49 | #define SYSCALL_ENTRY_STR "syscall_entry_" | |
50 | #define COMPAT_SYSCALL_ENTRY_STR "compat_syscall_entry_" | |
51 | #define SYSCALL_EXIT_STR "syscall_exit_" | |
52 | #define COMPAT_SYSCALL_EXIT_STR "compat_syscall_exit_" | |
53 | ||
a93244f8 | 54 | static |
2faf7d1b | 55 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
56 | static |
57 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 58 | |
3a523f5b MD |
59 | /* |
60 | * Forward declarations for old kernels. | |
61 | */ | |
62 | struct mmsghdr; | |
63 | struct rlimit64; | |
64 | struct oldold_utsname; | |
65 | struct old_utsname; | |
66 | struct sel_arg_struct; | |
67 | struct mmap_arg_struct; | |
68 | ||
80f87dd2 MD |
69 | #ifdef IA32_NR_syscalls |
70 | #define NR_compat_syscalls IA32_NR_syscalls | |
71 | #else | |
72 | #define NR_compat_syscalls NR_syscalls | |
73 | #endif | |
74 | ||
f7bdf4db MD |
75 | /* |
76 | * Take care of NOARGS not supported by mainline. | |
77 | */ | |
78 | #define DECLARE_EVENT_CLASS_NOARGS(name, tstruct, assign, print) | |
79 | #define DEFINE_EVENT_NOARGS(template, name) | |
80 | #define TRACE_EVENT_NOARGS(name, struct, assign, print) | |
81 | ||
259b6cb3 MD |
82 | /* |
83 | * Create LTTng tracepoint probes. | |
84 | */ | |
85 | #define LTTNG_PACKAGE_BUILD | |
86 | #define CREATE_TRACE_POINTS | |
2655f9ad | 87 | #define TP_MODULE_NOINIT |
2f804c0a | 88 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 89 | |
a93244f8 MD |
90 | #define PARAMS(args...) args |
91 | ||
5b7ac358 MD |
92 | /* Handle unknown syscalls */ |
93 | #define TRACE_SYSTEM syscalls_unknown | |
94 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
95 | #undef TRACE_SYSTEM | |
96 | ||
fc4f7161 MD |
97 | #define SC_ENTER |
98 | ||
fc4f7161 MD |
99 | #undef sc_exit |
100 | #define sc_exit(...) | |
b75d00c4 MD |
101 | #undef sc_in |
102 | #define sc_in(...) __VA_ARGS__ | |
103 | #undef sc_out | |
104 | #define sc_out(...) | |
105 | #undef sc_inout | |
106 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
107 | |
108 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 109 | #undef TP_PROBE_CB |
259b6cb3 | 110 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
a93244f8 | 111 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
5b7ac358 | 112 | TRACE_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args),\ |
a93244f8 | 113 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
7ca580f8 MD |
114 | #define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
115 | LTTNG_TRACE_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args),\ | |
116 | PARAMS(_locvar), PARAMS(_code),\ | |
117 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
a93244f8 | 118 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
5b7ac358 | 119 | DECLARE_EVENT_CLASS_NOARGS(syscall_enter_##_name, PARAMS(_struct), PARAMS(_assign),\ |
a93244f8 MD |
120 | PARAMS(_printk)) |
121 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
5b7ac358 | 122 | DEFINE_EVENT_NOARGS(syscall_enter_##_template, syscall_enter_##_name) |
a93244f8 | 123 | #undef TRACE_SYSTEM |
5b7ac358 MD |
124 | #define TRACE_SYSTEM syscall_enter_integers |
125 | #define TRACE_INCLUDE_FILE syscalls_integers | |
177b3692 | 126 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 127 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 128 | #undef TRACE_SYSTEM |
5b7ac358 MD |
129 | #define TRACE_SYSTEM syscall_enter_pointers |
130 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
177b3692 | 131 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 132 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 133 | #undef TRACE_SYSTEM |
7ca580f8 | 134 | #undef SC_LTTNG_TRACE_EVENT |
a93244f8 MD |
135 | #undef SC_TRACE_EVENT |
136 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
137 | #undef SC_DEFINE_EVENT_NOARGS | |
5b7ac358 | 138 | #undef TP_PROBE_CB |
a93244f8 MD |
139 | #undef _TRACE_SYSCALLS_integers_H |
140 | #undef _TRACE_SYSCALLS_pointers_H | |
141 | ||
5b7ac358 MD |
142 | |
143 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 MD |
144 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
145 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
5b7ac358 | 146 | TRACE_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 MD |
147 | PARAMS(_struct), PARAMS(_assign), \ |
148 | PARAMS(_printk)) | |
7ca580f8 MD |
149 | #define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
150 | LTTNG_TRACE_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args),\ | |
151 | PARAMS(_locvar), PARAMS(_code),\ | |
152 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
a93244f8 | 153 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
5b7ac358 MD |
154 | DECLARE_EVENT_CLASS_NOARGS(compat_syscall_enter_##_name, PARAMS(_struct), \ |
155 | PARAMS(_assign), PARAMS(_printk)) | |
156 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
157 | DEFINE_EVENT_NOARGS(compat_syscall_enter_##_template, \ | |
158 | compat_syscall_enter_##_name) | |
159 | #define TRACE_SYSTEM compat_syscall_enter_integers | |
160 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
161 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
162 | #undef TRACE_INCLUDE_FILE | |
163 | #undef TRACE_SYSTEM | |
164 | #define TRACE_SYSTEM compat_syscall_enter_pointers | |
165 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
166 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
167 | #undef TRACE_INCLUDE_FILE | |
168 | #undef TRACE_SYSTEM | |
7ca580f8 | 169 | #undef SC_LTTNG_TRACE_EVENT |
5b7ac358 MD |
170 | #undef SC_TRACE_EVENT |
171 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
172 | #undef SC_DEFINE_EVENT_NOARGS | |
173 | #undef TP_PROBE_CB | |
174 | #undef _TRACE_SYSCALLS_integers_H | |
175 | #undef _TRACE_SYSCALLS_pointers_H | |
176 | ||
fc4f7161 MD |
177 | #undef SC_ENTER |
178 | ||
179 | #define SC_EXIT | |
180 | ||
fc4f7161 MD |
181 | #undef sc_exit |
182 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
183 | #undef sc_in |
184 | #define sc_in(...) | |
185 | #undef sc_out | |
186 | #define sc_out(...) __VA_ARGS__ | |
187 | #undef sc_inout | |
188 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
189 | |
190 | /* Hijack probe callback for system call exit */ | |
191 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
192 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
193 | TRACE_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args),\ | |
194 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
7ca580f8 MD |
195 | #define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
196 | LTTNG_TRACE_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args),\ | |
197 | PARAMS(_locvar), PARAMS(_code),\ | |
198 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
5b7ac358 MD |
199 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
200 | DECLARE_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \ | |
201 | PARAMS(_assign), PARAMS(_printk)) | |
202 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
203 | DEFINE_EVENT_NOARGS(syscall_exit_##_template, \ | |
204 | syscall_exit_##_name) | |
205 | #define TRACE_SYSTEM syscall_exit_integers | |
206 | #define TRACE_INCLUDE_FILE syscalls_integers | |
207 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
208 | #undef TRACE_INCLUDE_FILE | |
209 | #undef TRACE_SYSTEM | |
210 | #define TRACE_SYSTEM syscall_exit_pointers | |
211 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
212 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
213 | #undef TRACE_INCLUDE_FILE | |
214 | #undef TRACE_SYSTEM | |
7ca580f8 | 215 | #undef SC_LTTNG_TRACE_EVENT |
5b7ac358 MD |
216 | #undef SC_TRACE_EVENT |
217 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
218 | #undef SC_DEFINE_EVENT_NOARGS | |
219 | #undef TP_PROBE_CB | |
220 | #undef _TRACE_SYSCALLS_integers_H | |
221 | #undef _TRACE_SYSCALLS_pointers_H | |
222 | ||
223 | ||
224 | /* Hijack probe callback for compat system call exit */ | |
225 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
226 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
227 | TRACE_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ | |
228 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
7ca580f8 MD |
229 | #define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
230 | LTTNG_TRACE_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args),\ | |
231 | PARAMS(_locvar), PARAMS(_code),\ | |
232 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
5b7ac358 MD |
233 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
234 | DECLARE_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \ | |
a93244f8 MD |
235 | PARAMS(_assign), PARAMS(_printk)) |
236 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
5b7ac358 MD |
237 | DEFINE_EVENT_NOARGS(compat_syscall_exit_##_template, \ |
238 | compat_syscall_exit_##_name) | |
239 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
240 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 241 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 242 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 243 | #undef TRACE_SYSTEM |
5b7ac358 MD |
244 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
245 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 246 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 247 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 248 | #undef TRACE_SYSTEM |
7ca580f8 | 249 | #undef SC_LTTNG_TRACE_EVENT |
a93244f8 MD |
250 | #undef SC_TRACE_EVENT |
251 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
252 | #undef SC_DEFINE_EVENT_NOARGS | |
253 | #undef TP_PROBE_CB | |
5b7ac358 MD |
254 | #undef _TRACE_SYSCALLS_integers_H |
255 | #undef _TRACE_SYSCALLS_pointers_H | |
256 | ||
fc4f7161 | 257 | #undef SC_EXIT |
259b6cb3 | 258 | |
2655f9ad | 259 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
260 | #undef LTTNG_PACKAGE_BUILD |
261 | #undef CREATE_TRACE_POINTS | |
262 | ||
a93244f8 MD |
263 | struct trace_syscall_entry { |
264 | void *func; | |
265 | const struct lttng_event_desc *desc; | |
266 | const struct lttng_event_field *fields; | |
267 | unsigned int nrargs; | |
268 | }; | |
269 | ||
270 | #define CREATE_SYSCALL_TABLE | |
271 | ||
fc4f7161 MD |
272 | #define SC_ENTER |
273 | ||
274 | #undef sc_exit | |
275 | #define sc_exit(...) | |
276 | ||
259b6cb3 | 277 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 278 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 279 | [ _nr ] = { \ |
5b7ac358 | 280 | .func = __event_probe__syscall_enter_##_template, \ |
259b6cb3 | 281 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
282 | .fields = __event_fields___syscall_enter_##_template, \ |
283 | .desc = &__event_desc___syscall_enter_##_name, \ | |
259b6cb3 MD |
284 | }, |
285 | ||
5b7ac358 | 286 | /* Syscall enter tracing table */ |
49c50022 | 287 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
288 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
289 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
290 | }; |
291 | ||
a93244f8 MD |
292 | #undef TRACE_SYSCALL_TABLE |
293 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
294 | [ _nr ] = { \ | |
5b7ac358 | 295 | .func = __event_probe__compat_syscall_enter_##_template, \ |
a93244f8 | 296 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
297 | .fields = __event_fields___compat_syscall_enter_##_template, \ |
298 | .desc = &__event_desc___compat_syscall_enter_##_name, \ | |
a93244f8 MD |
299 | }, |
300 | ||
5b7ac358 | 301 | /* Compat syscall enter table */ |
a93244f8 MD |
302 | const struct trace_syscall_entry compat_sc_table[] = { |
303 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
304 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
305 | }; | |
259b6cb3 | 306 | |
fc4f7161 MD |
307 | #undef SC_ENTER |
308 | ||
309 | #define SC_EXIT | |
310 | ||
311 | #undef sc_exit | |
312 | #define sc_exit(...) __VA_ARGS__ | |
313 | ||
5b7ac358 MD |
314 | #undef TRACE_SYSCALL_TABLE |
315 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
316 | [ _nr ] = { \ | |
317 | .func = __event_probe__syscall_exit_##_template, \ | |
318 | .nrargs = (_nrargs), \ | |
319 | .fields = __event_fields___syscall_exit_##_template, \ | |
320 | .desc = &__event_desc___syscall_exit_##_name, \ | |
321 | }, | |
322 | ||
323 | /* Syscall exit table */ | |
324 | static const struct trace_syscall_entry sc_exit_table[] = { | |
325 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
326 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
327 | }; | |
328 | ||
329 | #undef TRACE_SYSCALL_TABLE | |
330 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
331 | [ _nr ] = { \ | |
332 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
333 | .nrargs = (_nrargs), \ | |
334 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
335 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
336 | }, | |
337 | ||
338 | /* Compat syscall exit table */ | |
339 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
340 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
341 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
342 | }; | |
343 | ||
fc4f7161 MD |
344 | #undef SC_EXIT |
345 | ||
a93244f8 | 346 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 347 | |
80f87dd2 MD |
348 | struct lttng_syscall_filter { |
349 | DECLARE_BITMAP(sc, NR_syscalls); | |
350 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
351 | }; | |
352 | ||
a90917c3 | 353 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
354 | struct pt_regs *regs, unsigned int id) |
355 | { | |
356 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 357 | |
f405cfce | 358 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 359 | if (unlikely(is_compat_task())) |
5b7ac358 | 360 | __event_probe__compat_syscall_enter_unknown(event, id, args); |
a93244f8 | 361 | else |
5b7ac358 | 362 | __event_probe__syscall_enter_unknown(event, id, args); |
f405cfce MD |
363 | } |
364 | ||
2faf7d1b | 365 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 366 | { |
a90917c3 MD |
367 | struct lttng_channel *chan = __data; |
368 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
369 | const struct trace_syscall_entry *table, *entry; |
370 | size_t table_len; | |
259b6cb3 | 371 | |
b76dc1a0 | 372 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
373 | struct lttng_syscall_filter *filter; |
374 | ||
375 | filter = rcu_dereference(chan->sc_filter); | |
376 | if (filter) { | |
377 | if (id >= NR_compat_syscalls | |
378 | || !test_bit(id, filter->sc_compat)) { | |
379 | /* System call filtered out. */ | |
380 | return; | |
381 | } | |
382 | } | |
49c50022 | 383 | table = compat_sc_table; |
a93244f8 | 384 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
385 | unknown_event = chan->sc_compat_unknown; |
386 | } else { | |
80f87dd2 MD |
387 | struct lttng_syscall_filter *filter; |
388 | ||
389 | filter = rcu_dereference(chan->sc_filter); | |
390 | if (filter) { | |
391 | if (id >= NR_syscalls | |
392 | || !test_bit(id, filter->sc)) { | |
393 | /* System call filtered out. */ | |
394 | return; | |
395 | } | |
396 | } | |
49c50022 MD |
397 | table = sc_table; |
398 | table_len = ARRAY_SIZE(sc_table); | |
399 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 400 | } |
49c50022 MD |
401 | if (unlikely(id >= table_len)) { |
402 | syscall_entry_unknown(unknown_event, regs, id); | |
259b6cb3 | 403 | return; |
f405cfce | 404 | } |
49c50022 MD |
405 | if (unlikely(is_compat_task())) |
406 | event = chan->compat_sc_table[id]; | |
407 | else | |
408 | event = chan->sc_table[id]; | |
f405cfce | 409 | if (unlikely(!event)) { |
49c50022 | 410 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
411 | return; |
412 | } | |
49c50022 | 413 | entry = &table[id]; |
f405cfce | 414 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
415 | |
416 | switch (entry->nrargs) { | |
417 | case 0: | |
418 | { | |
419 | void (*fptr)(void *__data) = entry->func; | |
420 | ||
421 | fptr(event); | |
422 | break; | |
423 | } | |
424 | case 1: | |
425 | { | |
426 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
427 | unsigned long args[1]; | |
428 | ||
429 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
430 | fptr(event, args[0]); | |
431 | break; | |
432 | } | |
433 | case 2: | |
434 | { | |
435 | void (*fptr)(void *__data, | |
436 | unsigned long arg0, | |
437 | unsigned long arg1) = entry->func; | |
438 | unsigned long args[2]; | |
439 | ||
440 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
441 | fptr(event, args[0], args[1]); | |
442 | break; | |
443 | } | |
444 | case 3: | |
445 | { | |
446 | void (*fptr)(void *__data, | |
447 | unsigned long arg0, | |
448 | unsigned long arg1, | |
449 | unsigned long arg2) = entry->func; | |
450 | unsigned long args[3]; | |
451 | ||
452 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
453 | fptr(event, args[0], args[1], args[2]); | |
454 | break; | |
455 | } | |
456 | case 4: | |
457 | { | |
458 | void (*fptr)(void *__data, | |
459 | unsigned long arg0, | |
460 | unsigned long arg1, | |
461 | unsigned long arg2, | |
462 | unsigned long arg3) = entry->func; | |
463 | unsigned long args[4]; | |
464 | ||
465 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
466 | fptr(event, args[0], args[1], args[2], args[3]); | |
467 | break; | |
468 | } | |
469 | case 5: | |
470 | { | |
471 | void (*fptr)(void *__data, | |
472 | unsigned long arg0, | |
473 | unsigned long arg1, | |
474 | unsigned long arg2, | |
475 | unsigned long arg3, | |
476 | unsigned long arg4) = entry->func; | |
477 | unsigned long args[5]; | |
478 | ||
479 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
480 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
481 | break; | |
482 | } | |
483 | case 6: | |
484 | { | |
485 | void (*fptr)(void *__data, | |
486 | unsigned long arg0, | |
487 | unsigned long arg1, | |
488 | unsigned long arg2, | |
489 | unsigned long arg3, | |
490 | unsigned long arg4, | |
491 | unsigned long arg5) = entry->func; | |
492 | unsigned long args[6]; | |
493 | ||
494 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
495 | fptr(event, args[0], args[1], args[2], | |
496 | args[3], args[4], args[5]); | |
497 | break; | |
498 | } | |
499 | default: | |
500 | break; | |
501 | } | |
502 | } | |
503 | ||
5b7ac358 MD |
504 | static void syscall_exit_unknown(struct lttng_event *event, |
505 | struct pt_regs *regs, unsigned int id, long ret) | |
506 | { | |
507 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
508 | ||
509 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
510 | if (unlikely(is_compat_task())) | |
511 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
512 | args); | |
513 | else | |
514 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
515 | } | |
516 | ||
517 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
518 | { | |
519 | struct lttng_channel *chan = __data; | |
520 | struct lttng_event *event, *unknown_event; | |
521 | const struct trace_syscall_entry *table, *entry; | |
522 | size_t table_len; | |
523 | long id; | |
524 | ||
525 | id = syscall_get_nr(current, regs); | |
526 | if (unlikely(is_compat_task())) { | |
527 | struct lttng_syscall_filter *filter; | |
528 | ||
529 | filter = rcu_dereference(chan->sc_filter); | |
530 | if (filter) { | |
531 | if (id >= NR_compat_syscalls | |
532 | || !test_bit(id, filter->sc_compat)) { | |
533 | /* System call filtered out. */ | |
534 | return; | |
535 | } | |
536 | } | |
537 | table = compat_sc_exit_table; | |
538 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
539 | unknown_event = chan->compat_sc_exit_unknown; | |
540 | } else { | |
541 | struct lttng_syscall_filter *filter; | |
542 | ||
543 | filter = rcu_dereference(chan->sc_filter); | |
544 | if (filter) { | |
545 | if (id >= NR_syscalls | |
546 | || !test_bit(id, filter->sc)) { | |
547 | /* System call filtered out. */ | |
548 | return; | |
549 | } | |
550 | } | |
551 | table = sc_exit_table; | |
552 | table_len = ARRAY_SIZE(sc_exit_table); | |
553 | unknown_event = chan->sc_exit_unknown; | |
554 | } | |
555 | if (unlikely(id >= table_len)) { | |
556 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
557 | return; | |
558 | } | |
559 | if (unlikely(is_compat_task())) | |
560 | event = chan->compat_sc_exit_table[id]; | |
561 | else | |
562 | event = chan->sc_exit_table[id]; | |
563 | if (unlikely(!event)) { | |
564 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
565 | return; | |
566 | } | |
567 | entry = &table[id]; | |
568 | WARN_ON_ONCE(!entry); | |
569 | ||
570 | switch (entry->nrargs) { | |
571 | case 0: | |
572 | { | |
fc4f7161 | 573 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 574 | |
fc4f7161 | 575 | fptr(event, ret); |
5b7ac358 MD |
576 | break; |
577 | } | |
578 | case 1: | |
579 | { | |
580 | void (*fptr)(void *__data, | |
fc4f7161 | 581 | long ret, |
5b7ac358 MD |
582 | unsigned long arg0) = entry->func; |
583 | unsigned long args[1]; | |
584 | ||
585 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 586 | fptr(event, ret, args[0]); |
5b7ac358 MD |
587 | break; |
588 | } | |
589 | case 2: | |
590 | { | |
591 | void (*fptr)(void *__data, | |
fc4f7161 | 592 | long ret, |
5b7ac358 MD |
593 | unsigned long arg0, |
594 | unsigned long arg1) = entry->func; | |
595 | unsigned long args[2]; | |
596 | ||
597 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 598 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
599 | break; |
600 | } | |
601 | case 3: | |
602 | { | |
603 | void (*fptr)(void *__data, | |
fc4f7161 | 604 | long ret, |
5b7ac358 MD |
605 | unsigned long arg0, |
606 | unsigned long arg1, | |
607 | unsigned long arg2) = entry->func; | |
608 | unsigned long args[3]; | |
609 | ||
610 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 611 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
612 | break; |
613 | } | |
614 | case 4: | |
615 | { | |
616 | void (*fptr)(void *__data, | |
fc4f7161 | 617 | long ret, |
5b7ac358 MD |
618 | unsigned long arg0, |
619 | unsigned long arg1, | |
620 | unsigned long arg2, | |
621 | unsigned long arg3) = entry->func; | |
622 | unsigned long args[4]; | |
623 | ||
624 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 625 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
626 | break; |
627 | } | |
628 | case 5: | |
629 | { | |
630 | void (*fptr)(void *__data, | |
fc4f7161 | 631 | long ret, |
5b7ac358 MD |
632 | unsigned long arg0, |
633 | unsigned long arg1, | |
634 | unsigned long arg2, | |
635 | unsigned long arg3, | |
636 | unsigned long arg4) = entry->func; | |
637 | unsigned long args[5]; | |
638 | ||
639 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 640 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
641 | break; |
642 | } | |
643 | case 6: | |
644 | { | |
645 | void (*fptr)(void *__data, | |
fc4f7161 | 646 | long ret, |
5b7ac358 MD |
647 | unsigned long arg0, |
648 | unsigned long arg1, | |
649 | unsigned long arg2, | |
650 | unsigned long arg3, | |
651 | unsigned long arg4, | |
652 | unsigned long arg5) = entry->func; | |
653 | unsigned long args[6]; | |
654 | ||
655 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 656 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
657 | args[3], args[4], args[5]); |
658 | break; | |
659 | } | |
660 | default: | |
661 | break; | |
662 | } | |
663 | } | |
664 | ||
2a0c4816 | 665 | /* noinline to diminish caller stack size */ |
49c50022 MD |
666 | static |
667 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
668 | struct lttng_event **chan_table, struct lttng_channel *chan, |
669 | void *filter, enum sc_type type) | |
259b6cb3 | 670 | { |
2a0c4816 | 671 | const struct lttng_event_desc *desc; |
259b6cb3 | 672 | unsigned int i; |
49c50022 MD |
673 | |
674 | /* Allocate events for each syscall, insert into table */ | |
675 | for (i = 0; i < table_len; i++) { | |
676 | struct lttng_kernel_event ev; | |
2a0c4816 | 677 | desc = table[i].desc; |
49c50022 MD |
678 | |
679 | if (!desc) { | |
680 | /* Unknown syscall */ | |
681 | continue; | |
682 | } | |
683 | /* | |
684 | * Skip those already populated by previous failed | |
685 | * register for this channel. | |
686 | */ | |
687 | if (chan_table[i]) | |
688 | continue; | |
689 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
690 | switch (type) { |
691 | case SC_TYPE_ENTRY: | |
692 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
693 | LTTNG_KERNEL_SYM_NAME_LEN); | |
694 | break; | |
695 | case SC_TYPE_EXIT: | |
696 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
697 | LTTNG_KERNEL_SYM_NAME_LEN); | |
698 | break; | |
699 | case SC_TYPE_COMPAT_ENTRY: | |
700 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
701 | LTTNG_KERNEL_SYM_NAME_LEN); | |
702 | break; | |
703 | case SC_TYPE_COMPAT_EXIT: | |
704 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
705 | LTTNG_KERNEL_SYM_NAME_LEN); | |
706 | break; | |
707 | default: | |
708 | BUG_ON(1); | |
709 | break; | |
710 | } | |
711 | strncat(ev.name, desc->name, | |
712 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 713 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
49c50022 | 714 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 715 | chan_table[i] = lttng_event_create(chan, &ev, filter, |
49c50022 | 716 | desc); |
abc0446a MD |
717 | WARN_ON_ONCE(!chan_table[i]); |
718 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
719 | /* |
720 | * If something goes wrong in event registration | |
721 | * after the first one, we have no choice but to | |
722 | * leave the previous events in there, until | |
723 | * deleted by session teardown. | |
724 | */ | |
abc0446a | 725 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
726 | } |
727 | } | |
728 | return 0; | |
729 | } | |
730 | ||
a90917c3 | 731 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 732 | { |
2a0c4816 | 733 | struct lttng_kernel_event ev; |
259b6cb3 MD |
734 | int ret; |
735 | ||
736 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
737 | |
738 | if (!chan->sc_table) { | |
739 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 740 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
741 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
742 | if (!chan->sc_table) | |
743 | return -ENOMEM; | |
744 | } | |
5b7ac358 MD |
745 | if (!chan->sc_exit_table) { |
746 | /* create syscall table mapping syscall to events */ | |
747 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
748 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
749 | if (!chan->sc_exit_table) | |
750 | return -ENOMEM; | |
751 | } | |
752 | ||
259b6cb3 | 753 | |
49c50022 MD |
754 | #ifdef CONFIG_COMPAT |
755 | if (!chan->compat_sc_table) { | |
756 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 757 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 758 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
759 | if (!chan->compat_sc_table) |
760 | return -ENOMEM; | |
761 | } | |
5b7ac358 MD |
762 | |
763 | if (!chan->compat_sc_exit_table) { | |
764 | /* create syscall table mapping compat syscall to events */ | |
765 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
766 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
767 | if (!chan->compat_sc_exit_table) | |
768 | return -ENOMEM; | |
769 | } | |
49c50022 | 770 | #endif |
f405cfce | 771 | if (!chan->sc_unknown) { |
f405cfce | 772 | const struct lttng_event_desc *desc = |
5b7ac358 | 773 | &__event_desc___syscall_enter_unknown; |
2f804c0a | 774 | |
f405cfce | 775 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
776 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
777 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f405cfce | 778 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 779 | chan->sc_unknown = lttng_event_create(chan, &ev, filter, |
f405cfce | 780 | desc); |
abc0446a MD |
781 | WARN_ON_ONCE(!chan->sc_unknown); |
782 | if (IS_ERR(chan->sc_unknown)) { | |
783 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
784 | } |
785 | } | |
786 | ||
b76dc1a0 | 787 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 788 | const struct lttng_event_desc *desc = |
5b7ac358 | 789 | &__event_desc___compat_syscall_enter_unknown; |
b76dc1a0 MD |
790 | |
791 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
792 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
793 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
b76dc1a0 | 794 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 795 | chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter, |
b76dc1a0 | 796 | desc); |
abc0446a MD |
797 | WARN_ON_ONCE(!chan->sc_unknown); |
798 | if (IS_ERR(chan->sc_compat_unknown)) { | |
799 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
800 | } |
801 | } | |
802 | ||
5b7ac358 | 803 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 804 | const struct lttng_event_desc *desc = |
5b7ac358 | 805 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
806 | |
807 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
808 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
809 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2f804c0a | 810 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
5b7ac358 MD |
811 | chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev, |
812 | filter, desc); | |
813 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); | |
814 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
815 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
816 | } | |
817 | } | |
818 | ||
819 | if (!chan->sc_exit_unknown) { | |
820 | const struct lttng_event_desc *desc = | |
821 | &__event_desc___syscall_exit_unknown; | |
822 | ||
823 | memset(&ev, 0, sizeof(ev)); | |
824 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
825 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
826 | ev.instrumentation = LTTNG_KERNEL_NOOP; | |
827 | chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter, | |
2f804c0a | 828 | desc); |
5b7ac358 MD |
829 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
830 | if (IS_ERR(chan->sc_exit_unknown)) { | |
831 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
832 | } |
833 | } | |
834 | ||
49c50022 | 835 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
836 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
837 | if (ret) | |
838 | return ret; | |
839 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
840 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
841 | if (ret) |
842 | return ret; | |
5b7ac358 | 843 | |
49c50022 | 844 | #ifdef CONFIG_COMPAT |
a93244f8 | 845 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
846 | chan->compat_sc_table, chan, filter, |
847 | SC_TYPE_COMPAT_ENTRY); | |
848 | if (ret) | |
849 | return ret; | |
850 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
851 | chan->compat_sc_exit_table, chan, filter, | |
852 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
853 | if (ret) |
854 | return ret; | |
855 | #endif | |
80f87dd2 MD |
856 | if (!chan->sys_enter_registered) { |
857 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
858 | (void *) syscall_entry_probe, chan); | |
859 | if (ret) | |
860 | return ret; | |
861 | chan->sys_enter_registered = 1; | |
862 | } | |
63728b02 MD |
863 | /* |
864 | * We change the name of sys_exit tracepoint due to namespace | |
865 | * conflict with sys_exit syscall entry. | |
866 | */ | |
80f87dd2 MD |
867 | if (!chan->sys_exit_registered) { |
868 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 869 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
870 | if (ret) { |
871 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
872 | (void *) syscall_entry_probe, chan)); | |
873 | return ret; | |
874 | } | |
875 | chan->sys_exit_registered = 1; | |
63728b02 | 876 | } |
259b6cb3 MD |
877 | return ret; |
878 | } | |
879 | ||
880 | /* | |
881 | * Only called at session destruction. | |
882 | */ | |
a90917c3 | 883 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
884 | { |
885 | int ret; | |
886 | ||
887 | if (!chan->sc_table) | |
888 | return 0; | |
80f87dd2 MD |
889 | if (chan->sys_enter_registered) { |
890 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 891 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
892 | if (ret) |
893 | return ret; | |
894 | chan->sys_enter_registered = 0; | |
895 | } | |
896 | if (chan->sys_exit_registered) { | |
897 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
898 | (void *) syscall_entry_probe, chan); | |
899 | if (ret) | |
900 | return ret; | |
901 | chan->sys_exit_registered = 0; | |
902 | } | |
a90917c3 | 903 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 904 | kfree(chan->sc_table); |
5b7ac358 | 905 | kfree(chan->sc_exit_table); |
49c50022 MD |
906 | #ifdef CONFIG_COMPAT |
907 | kfree(chan->compat_sc_table); | |
5b7ac358 | 908 | kfree(chan->compat_sc_exit_table); |
49c50022 | 909 | #endif |
80f87dd2 MD |
910 | kfree(chan->sc_filter); |
911 | return 0; | |
912 | } | |
913 | ||
914 | static | |
915 | int get_syscall_nr(const char *syscall_name) | |
916 | { | |
917 | int syscall_nr = -1; | |
918 | int i; | |
919 | ||
920 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
921 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 922 | const char *it_name; |
80f87dd2 MD |
923 | |
924 | entry = &sc_table[i]; | |
925 | if (!entry->desc) | |
926 | continue; | |
5b7ac358 MD |
927 | it_name = entry->desc->name; |
928 | it_name += strlen(SYSCALL_ENTRY_STR); | |
929 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
930 | syscall_nr = i; |
931 | break; | |
932 | } | |
933 | } | |
934 | return syscall_nr; | |
935 | } | |
936 | ||
937 | static | |
938 | int get_compat_syscall_nr(const char *syscall_name) | |
939 | { | |
940 | int syscall_nr = -1; | |
941 | int i; | |
942 | ||
943 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
944 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 945 | const char *it_name; |
80f87dd2 MD |
946 | |
947 | entry = &compat_sc_table[i]; | |
948 | if (!entry->desc) | |
949 | continue; | |
5b7ac358 MD |
950 | it_name = entry->desc->name; |
951 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
952 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
953 | syscall_nr = i; |
954 | break; | |
955 | } | |
956 | } | |
957 | return syscall_nr; | |
958 | } | |
959 | ||
960 | int lttng_syscall_filter_enable(struct lttng_channel *chan, | |
961 | const char *name) | |
962 | { | |
963 | int syscall_nr, compat_syscall_nr, ret; | |
964 | struct lttng_syscall_filter *filter; | |
965 | ||
966 | WARN_ON_ONCE(!chan->sc_table); | |
967 | ||
968 | if (!name) { | |
969 | /* Enable all system calls by removing filter */ | |
970 | if (chan->sc_filter) { | |
971 | filter = chan->sc_filter; | |
972 | rcu_assign_pointer(chan->sc_filter, NULL); | |
973 | synchronize_trace(); | |
974 | kfree(filter); | |
975 | } | |
976 | chan->syscall_all = 1; | |
977 | return 0; | |
978 | } | |
979 | ||
980 | if (!chan->sc_filter) { | |
981 | if (chan->syscall_all) { | |
982 | /* | |
983 | * All syscalls are already enabled. | |
984 | */ | |
985 | return -EEXIST; | |
986 | } | |
987 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
988 | GFP_KERNEL); | |
989 | if (!filter) | |
990 | return -ENOMEM; | |
991 | } else { | |
992 | filter = chan->sc_filter; | |
993 | } | |
994 | syscall_nr = get_syscall_nr(name); | |
995 | compat_syscall_nr = get_compat_syscall_nr(name); | |
996 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
997 | ret = -ENOENT; | |
998 | goto error; | |
999 | } | |
1000 | if (syscall_nr >= 0) { | |
1001 | if (test_bit(syscall_nr, filter->sc)) { | |
1002 | ret = -EEXIST; | |
1003 | goto error; | |
1004 | } | |
1005 | bitmap_set(filter->sc, syscall_nr, 1); | |
1006 | } | |
1007 | if (compat_syscall_nr >= 0) { | |
1008 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1009 | ret = -EEXIST; | |
1010 | goto error; | |
1011 | } | |
1012 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1013 | } | |
1014 | if (!chan->sc_filter) | |
1015 | rcu_assign_pointer(chan->sc_filter, filter); | |
1016 | return 0; | |
1017 | ||
1018 | error: | |
1019 | if (!chan->sc_filter) | |
1020 | kfree(filter); | |
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1025 | const char *name) | |
1026 | { | |
1027 | int syscall_nr, compat_syscall_nr, ret; | |
1028 | struct lttng_syscall_filter *filter; | |
1029 | ||
1030 | WARN_ON_ONCE(!chan->sc_table); | |
1031 | ||
1032 | if (!chan->sc_filter) { | |
1033 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1034 | GFP_KERNEL); | |
1035 | if (!filter) | |
1036 | return -ENOMEM; | |
1037 | /* Trace all system calls, then apply disable. */ | |
1038 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1039 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1040 | } else { | |
1041 | filter = chan->sc_filter; | |
1042 | } | |
1043 | ||
1044 | syscall_nr = get_syscall_nr(name); | |
1045 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1046 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1047 | ret = -ENOENT; | |
1048 | goto error; | |
1049 | } | |
1050 | if (syscall_nr >= 0) { | |
1051 | if (!test_bit(syscall_nr, chan->sc_filter->sc)) { | |
1052 | ret = -EEXIST; | |
1053 | goto error; | |
1054 | } | |
1055 | bitmap_clear(chan->sc_filter->sc, syscall_nr, 1); | |
1056 | } | |
1057 | if (compat_syscall_nr >= 0) { | |
1058 | if (!test_bit(compat_syscall_nr, chan->sc_filter->sc_compat)) { | |
1059 | ret = -EEXIST; | |
1060 | goto error; | |
1061 | } | |
1062 | bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1); | |
1063 | } | |
1064 | if (!chan->sc_filter) | |
1065 | rcu_assign_pointer(chan->sc_filter, filter); | |
1066 | chan->syscall_all = 0; | |
259b6cb3 | 1067 | return 0; |
80f87dd2 MD |
1068 | |
1069 | error: | |
1070 | if (!chan->sc_filter) | |
1071 | kfree(filter); | |
1072 | return ret; | |
259b6cb3 | 1073 | } |