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 | ||
259b6cb3 MD |
75 | /* |
76 | * Create LTTng tracepoint probes. | |
77 | */ | |
78 | #define LTTNG_PACKAGE_BUILD | |
79 | #define CREATE_TRACE_POINTS | |
2655f9ad | 80 | #define TP_MODULE_NOINIT |
2f804c0a | 81 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 82 | |
a93244f8 MD |
83 | #define PARAMS(args...) args |
84 | ||
5b7ac358 MD |
85 | /* Handle unknown syscalls */ |
86 | #define TRACE_SYSTEM syscalls_unknown | |
87 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
88 | #undef TRACE_SYSTEM | |
89 | ||
fc4f7161 MD |
90 | #define SC_ENTER |
91 | ||
fc4f7161 MD |
92 | #undef sc_exit |
93 | #define sc_exit(...) | |
b75d00c4 MD |
94 | #undef sc_in |
95 | #define sc_in(...) __VA_ARGS__ | |
96 | #undef sc_out | |
97 | #define sc_out(...) | |
98 | #undef sc_inout | |
99 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
100 | |
101 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 102 | #undef TP_PROBE_CB |
259b6cb3 | 103 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
a93244f8 | 104 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 105 | LTTNG_TRACEPOINT_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 | 106 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
7ca580f8 | 107 | #define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 108 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args),\ |
7ca580f8 MD |
109 | PARAMS(_locvar), PARAMS(_code),\ |
110 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
a93244f8 | 111 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 112 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_enter_##_name, PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 MD |
113 | PARAMS(_printk)) |
114 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
3bc29f0a | 115 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_enter_##_template, syscall_enter_##_name) |
a93244f8 | 116 | #undef TRACE_SYSTEM |
5b7ac358 MD |
117 | #define TRACE_SYSTEM syscall_enter_integers |
118 | #define TRACE_INCLUDE_FILE syscalls_integers | |
177b3692 | 119 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 120 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 121 | #undef TRACE_SYSTEM |
5b7ac358 MD |
122 | #define TRACE_SYSTEM syscall_enter_pointers |
123 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
177b3692 | 124 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 125 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 126 | #undef TRACE_SYSTEM |
7ca580f8 | 127 | #undef SC_LTTNG_TRACE_EVENT |
a93244f8 MD |
128 | #undef SC_TRACE_EVENT |
129 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
130 | #undef SC_DEFINE_EVENT_NOARGS | |
5b7ac358 | 131 | #undef TP_PROBE_CB |
3bc29f0a MD |
132 | #undef _TRACE_SYSCALLS_INTEGERS_H |
133 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
134 | |
135 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 MD |
136 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
137 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
3bc29f0a | 138 | LTTNG_TRACEPOINT_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 MD |
139 | PARAMS(_struct), PARAMS(_assign), \ |
140 | PARAMS(_printk)) | |
7ca580f8 | 141 | #define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 142 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
7ca580f8 MD |
143 | PARAMS(_locvar), PARAMS(_code),\ |
144 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) | |
a93244f8 | 145 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 146 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_enter_##_name, PARAMS(_struct), \ |
5b7ac358 MD |
147 | PARAMS(_assign), PARAMS(_printk)) |
148 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
3bc29f0a | 149 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_enter_##_template, \ |
5b7ac358 MD |
150 | compat_syscall_enter_##_name) |
151 | #define TRACE_SYSTEM compat_syscall_enter_integers | |
152 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
153 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
154 | #undef TRACE_INCLUDE_FILE | |
155 | #undef TRACE_SYSTEM | |
156 | #define TRACE_SYSTEM compat_syscall_enter_pointers | |
157 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
158 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
159 | #undef TRACE_INCLUDE_FILE | |
160 | #undef TRACE_SYSTEM | |
7ca580f8 | 161 | #undef SC_LTTNG_TRACE_EVENT |
5b7ac358 MD |
162 | #undef SC_TRACE_EVENT |
163 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
164 | #undef SC_DEFINE_EVENT_NOARGS | |
165 | #undef TP_PROBE_CB | |
3bc29f0a MD |
166 | #undef _TRACE_SYSCALLS_INTEGERS_H |
167 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 168 | |
fc4f7161 MD |
169 | #undef SC_ENTER |
170 | ||
171 | #define SC_EXIT | |
172 | ||
fc4f7161 MD |
173 | #undef sc_exit |
174 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
175 | #undef sc_in |
176 | #define sc_in(...) | |
177 | #undef sc_out | |
178 | #define sc_out(...) __VA_ARGS__ | |
179 | #undef sc_inout | |
180 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
181 | |
182 | /* Hijack probe callback for system call exit */ | |
183 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
184 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
3bc29f0a | 185 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 186 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
7ca580f8 | 187 | #define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a MD |
188 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
189 | PARAMS(_locvar), PARAMS(_code), \ | |
7ca580f8 | 190 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
5b7ac358 | 191 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 192 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \ |
5b7ac358 MD |
193 | PARAMS(_assign), PARAMS(_printk)) |
194 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
3bc29f0a | 195 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ |
5b7ac358 MD |
196 | syscall_exit_##_name) |
197 | #define TRACE_SYSTEM syscall_exit_integers | |
198 | #define TRACE_INCLUDE_FILE syscalls_integers | |
199 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
200 | #undef TRACE_INCLUDE_FILE | |
201 | #undef TRACE_SYSTEM | |
202 | #define TRACE_SYSTEM syscall_exit_pointers | |
203 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
204 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
205 | #undef TRACE_INCLUDE_FILE | |
206 | #undef TRACE_SYSTEM | |
7ca580f8 | 207 | #undef SC_LTTNG_TRACE_EVENT |
5b7ac358 MD |
208 | #undef SC_TRACE_EVENT |
209 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
210 | #undef SC_DEFINE_EVENT_NOARGS | |
211 | #undef TP_PROBE_CB | |
3bc29f0a MD |
212 | #undef _TRACE_SYSCALLS_INTEGERS_H |
213 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
214 | |
215 | ||
216 | /* Hijack probe callback for compat system call exit */ | |
217 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
218 | #define SC_TRACE_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ | |
3bc29f0a | 219 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 220 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
7ca580f8 | 221 | #define SC_LTTNG_TRACE_EVENT(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a MD |
222 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
223 | PARAMS(_locvar), PARAMS(_code), \ | |
7ca580f8 | 224 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
5b7ac358 | 225 | #define SC_DECLARE_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 226 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \ |
a93244f8 MD |
227 | PARAMS(_assign), PARAMS(_printk)) |
228 | #define SC_DEFINE_EVENT_NOARGS(_template, _name) \ | |
3bc29f0a | 229 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 MD |
230 | compat_syscall_exit_##_name) |
231 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
232 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 233 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 234 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 235 | #undef TRACE_SYSTEM |
5b7ac358 MD |
236 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
237 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 238 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 239 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 240 | #undef TRACE_SYSTEM |
7ca580f8 | 241 | #undef SC_LTTNG_TRACE_EVENT |
a93244f8 MD |
242 | #undef SC_TRACE_EVENT |
243 | #undef SC_DECLARE_EVENT_CLASS_NOARGS | |
244 | #undef SC_DEFINE_EVENT_NOARGS | |
245 | #undef TP_PROBE_CB | |
3bc29f0a MD |
246 | #undef _TRACE_SYSCALLS_INTEGERS_H |
247 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 248 | |
fc4f7161 | 249 | #undef SC_EXIT |
259b6cb3 | 250 | |
2655f9ad | 251 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
252 | #undef LTTNG_PACKAGE_BUILD |
253 | #undef CREATE_TRACE_POINTS | |
254 | ||
a93244f8 MD |
255 | struct trace_syscall_entry { |
256 | void *func; | |
257 | const struct lttng_event_desc *desc; | |
258 | const struct lttng_event_field *fields; | |
259 | unsigned int nrargs; | |
260 | }; | |
261 | ||
262 | #define CREATE_SYSCALL_TABLE | |
263 | ||
fc4f7161 MD |
264 | #define SC_ENTER |
265 | ||
266 | #undef sc_exit | |
267 | #define sc_exit(...) | |
268 | ||
259b6cb3 | 269 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 270 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 271 | [ _nr ] = { \ |
5b7ac358 | 272 | .func = __event_probe__syscall_enter_##_template, \ |
259b6cb3 | 273 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
274 | .fields = __event_fields___syscall_enter_##_template, \ |
275 | .desc = &__event_desc___syscall_enter_##_name, \ | |
259b6cb3 MD |
276 | }, |
277 | ||
5b7ac358 | 278 | /* Syscall enter tracing table */ |
49c50022 | 279 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
280 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
281 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
282 | }; |
283 | ||
a93244f8 MD |
284 | #undef TRACE_SYSCALL_TABLE |
285 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
286 | [ _nr ] = { \ | |
5b7ac358 | 287 | .func = __event_probe__compat_syscall_enter_##_template, \ |
a93244f8 | 288 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
289 | .fields = __event_fields___compat_syscall_enter_##_template, \ |
290 | .desc = &__event_desc___compat_syscall_enter_##_name, \ | |
a93244f8 MD |
291 | }, |
292 | ||
5b7ac358 | 293 | /* Compat syscall enter table */ |
a93244f8 MD |
294 | const struct trace_syscall_entry compat_sc_table[] = { |
295 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
296 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
297 | }; | |
259b6cb3 | 298 | |
fc4f7161 MD |
299 | #undef SC_ENTER |
300 | ||
301 | #define SC_EXIT | |
302 | ||
303 | #undef sc_exit | |
304 | #define sc_exit(...) __VA_ARGS__ | |
305 | ||
5b7ac358 MD |
306 | #undef TRACE_SYSCALL_TABLE |
307 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
308 | [ _nr ] = { \ | |
309 | .func = __event_probe__syscall_exit_##_template, \ | |
310 | .nrargs = (_nrargs), \ | |
311 | .fields = __event_fields___syscall_exit_##_template, \ | |
312 | .desc = &__event_desc___syscall_exit_##_name, \ | |
313 | }, | |
314 | ||
315 | /* Syscall exit table */ | |
316 | static const struct trace_syscall_entry sc_exit_table[] = { | |
317 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
318 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
319 | }; | |
320 | ||
321 | #undef TRACE_SYSCALL_TABLE | |
322 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
323 | [ _nr ] = { \ | |
324 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
325 | .nrargs = (_nrargs), \ | |
326 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
327 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
328 | }, | |
329 | ||
330 | /* Compat syscall exit table */ | |
331 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
332 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
333 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
334 | }; | |
335 | ||
fc4f7161 MD |
336 | #undef SC_EXIT |
337 | ||
a93244f8 | 338 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 339 | |
80f87dd2 MD |
340 | struct lttng_syscall_filter { |
341 | DECLARE_BITMAP(sc, NR_syscalls); | |
342 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
343 | }; | |
344 | ||
a90917c3 | 345 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
346 | struct pt_regs *regs, unsigned int id) |
347 | { | |
348 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 349 | |
f405cfce | 350 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 351 | if (unlikely(is_compat_task())) |
5b7ac358 | 352 | __event_probe__compat_syscall_enter_unknown(event, id, args); |
a93244f8 | 353 | else |
5b7ac358 | 354 | __event_probe__syscall_enter_unknown(event, id, args); |
f405cfce MD |
355 | } |
356 | ||
2faf7d1b | 357 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 358 | { |
a90917c3 MD |
359 | struct lttng_channel *chan = __data; |
360 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
361 | const struct trace_syscall_entry *table, *entry; |
362 | size_t table_len; | |
259b6cb3 | 363 | |
b76dc1a0 | 364 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
365 | struct lttng_syscall_filter *filter; |
366 | ||
367 | filter = rcu_dereference(chan->sc_filter); | |
368 | if (filter) { | |
369 | if (id >= NR_compat_syscalls | |
370 | || !test_bit(id, filter->sc_compat)) { | |
371 | /* System call filtered out. */ | |
372 | return; | |
373 | } | |
374 | } | |
49c50022 | 375 | table = compat_sc_table; |
a93244f8 | 376 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
377 | unknown_event = chan->sc_compat_unknown; |
378 | } else { | |
80f87dd2 MD |
379 | struct lttng_syscall_filter *filter; |
380 | ||
381 | filter = rcu_dereference(chan->sc_filter); | |
382 | if (filter) { | |
383 | if (id >= NR_syscalls | |
384 | || !test_bit(id, filter->sc)) { | |
385 | /* System call filtered out. */ | |
386 | return; | |
387 | } | |
388 | } | |
49c50022 MD |
389 | table = sc_table; |
390 | table_len = ARRAY_SIZE(sc_table); | |
391 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 392 | } |
49c50022 MD |
393 | if (unlikely(id >= table_len)) { |
394 | syscall_entry_unknown(unknown_event, regs, id); | |
259b6cb3 | 395 | return; |
f405cfce | 396 | } |
49c50022 MD |
397 | if (unlikely(is_compat_task())) |
398 | event = chan->compat_sc_table[id]; | |
399 | else | |
400 | event = chan->sc_table[id]; | |
f405cfce | 401 | if (unlikely(!event)) { |
49c50022 | 402 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
403 | return; |
404 | } | |
49c50022 | 405 | entry = &table[id]; |
f405cfce | 406 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
407 | |
408 | switch (entry->nrargs) { | |
409 | case 0: | |
410 | { | |
411 | void (*fptr)(void *__data) = entry->func; | |
412 | ||
413 | fptr(event); | |
414 | break; | |
415 | } | |
416 | case 1: | |
417 | { | |
418 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
419 | unsigned long args[1]; | |
420 | ||
421 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
422 | fptr(event, args[0]); | |
423 | break; | |
424 | } | |
425 | case 2: | |
426 | { | |
427 | void (*fptr)(void *__data, | |
428 | unsigned long arg0, | |
429 | unsigned long arg1) = entry->func; | |
430 | unsigned long args[2]; | |
431 | ||
432 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
433 | fptr(event, args[0], args[1]); | |
434 | break; | |
435 | } | |
436 | case 3: | |
437 | { | |
438 | void (*fptr)(void *__data, | |
439 | unsigned long arg0, | |
440 | unsigned long arg1, | |
441 | unsigned long arg2) = entry->func; | |
442 | unsigned long args[3]; | |
443 | ||
444 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
445 | fptr(event, args[0], args[1], args[2]); | |
446 | break; | |
447 | } | |
448 | case 4: | |
449 | { | |
450 | void (*fptr)(void *__data, | |
451 | unsigned long arg0, | |
452 | unsigned long arg1, | |
453 | unsigned long arg2, | |
454 | unsigned long arg3) = entry->func; | |
455 | unsigned long args[4]; | |
456 | ||
457 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
458 | fptr(event, args[0], args[1], args[2], args[3]); | |
459 | break; | |
460 | } | |
461 | case 5: | |
462 | { | |
463 | void (*fptr)(void *__data, | |
464 | unsigned long arg0, | |
465 | unsigned long arg1, | |
466 | unsigned long arg2, | |
467 | unsigned long arg3, | |
468 | unsigned long arg4) = entry->func; | |
469 | unsigned long args[5]; | |
470 | ||
471 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
472 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
473 | break; | |
474 | } | |
475 | case 6: | |
476 | { | |
477 | void (*fptr)(void *__data, | |
478 | unsigned long arg0, | |
479 | unsigned long arg1, | |
480 | unsigned long arg2, | |
481 | unsigned long arg3, | |
482 | unsigned long arg4, | |
483 | unsigned long arg5) = entry->func; | |
484 | unsigned long args[6]; | |
485 | ||
486 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
487 | fptr(event, args[0], args[1], args[2], | |
488 | args[3], args[4], args[5]); | |
489 | break; | |
490 | } | |
491 | default: | |
492 | break; | |
493 | } | |
494 | } | |
495 | ||
5b7ac358 MD |
496 | static void syscall_exit_unknown(struct lttng_event *event, |
497 | struct pt_regs *regs, unsigned int id, long ret) | |
498 | { | |
499 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
500 | ||
501 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
502 | if (unlikely(is_compat_task())) | |
503 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
504 | args); | |
505 | else | |
506 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
507 | } | |
508 | ||
509 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
510 | { | |
511 | struct lttng_channel *chan = __data; | |
512 | struct lttng_event *event, *unknown_event; | |
513 | const struct trace_syscall_entry *table, *entry; | |
514 | size_t table_len; | |
515 | long id; | |
516 | ||
517 | id = syscall_get_nr(current, regs); | |
518 | if (unlikely(is_compat_task())) { | |
519 | struct lttng_syscall_filter *filter; | |
520 | ||
521 | filter = rcu_dereference(chan->sc_filter); | |
522 | if (filter) { | |
523 | if (id >= NR_compat_syscalls | |
524 | || !test_bit(id, filter->sc_compat)) { | |
525 | /* System call filtered out. */ | |
526 | return; | |
527 | } | |
528 | } | |
529 | table = compat_sc_exit_table; | |
530 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
531 | unknown_event = chan->compat_sc_exit_unknown; | |
532 | } else { | |
533 | struct lttng_syscall_filter *filter; | |
534 | ||
535 | filter = rcu_dereference(chan->sc_filter); | |
536 | if (filter) { | |
537 | if (id >= NR_syscalls | |
538 | || !test_bit(id, filter->sc)) { | |
539 | /* System call filtered out. */ | |
540 | return; | |
541 | } | |
542 | } | |
543 | table = sc_exit_table; | |
544 | table_len = ARRAY_SIZE(sc_exit_table); | |
545 | unknown_event = chan->sc_exit_unknown; | |
546 | } | |
547 | if (unlikely(id >= table_len)) { | |
548 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
549 | return; | |
550 | } | |
551 | if (unlikely(is_compat_task())) | |
552 | event = chan->compat_sc_exit_table[id]; | |
553 | else | |
554 | event = chan->sc_exit_table[id]; | |
555 | if (unlikely(!event)) { | |
556 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
557 | return; | |
558 | } | |
559 | entry = &table[id]; | |
560 | WARN_ON_ONCE(!entry); | |
561 | ||
562 | switch (entry->nrargs) { | |
563 | case 0: | |
564 | { | |
fc4f7161 | 565 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 566 | |
fc4f7161 | 567 | fptr(event, ret); |
5b7ac358 MD |
568 | break; |
569 | } | |
570 | case 1: | |
571 | { | |
572 | void (*fptr)(void *__data, | |
fc4f7161 | 573 | long ret, |
5b7ac358 MD |
574 | unsigned long arg0) = entry->func; |
575 | unsigned long args[1]; | |
576 | ||
577 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 578 | fptr(event, ret, args[0]); |
5b7ac358 MD |
579 | break; |
580 | } | |
581 | case 2: | |
582 | { | |
583 | void (*fptr)(void *__data, | |
fc4f7161 | 584 | long ret, |
5b7ac358 MD |
585 | unsigned long arg0, |
586 | unsigned long arg1) = entry->func; | |
587 | unsigned long args[2]; | |
588 | ||
589 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 590 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
591 | break; |
592 | } | |
593 | case 3: | |
594 | { | |
595 | void (*fptr)(void *__data, | |
fc4f7161 | 596 | long ret, |
5b7ac358 MD |
597 | unsigned long arg0, |
598 | unsigned long arg1, | |
599 | unsigned long arg2) = entry->func; | |
600 | unsigned long args[3]; | |
601 | ||
602 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 603 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
604 | break; |
605 | } | |
606 | case 4: | |
607 | { | |
608 | void (*fptr)(void *__data, | |
fc4f7161 | 609 | long ret, |
5b7ac358 MD |
610 | unsigned long arg0, |
611 | unsigned long arg1, | |
612 | unsigned long arg2, | |
613 | unsigned long arg3) = entry->func; | |
614 | unsigned long args[4]; | |
615 | ||
616 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 617 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
618 | break; |
619 | } | |
620 | case 5: | |
621 | { | |
622 | void (*fptr)(void *__data, | |
fc4f7161 | 623 | long ret, |
5b7ac358 MD |
624 | unsigned long arg0, |
625 | unsigned long arg1, | |
626 | unsigned long arg2, | |
627 | unsigned long arg3, | |
628 | unsigned long arg4) = entry->func; | |
629 | unsigned long args[5]; | |
630 | ||
631 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 632 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
633 | break; |
634 | } | |
635 | case 6: | |
636 | { | |
637 | void (*fptr)(void *__data, | |
fc4f7161 | 638 | long ret, |
5b7ac358 MD |
639 | unsigned long arg0, |
640 | unsigned long arg1, | |
641 | unsigned long arg2, | |
642 | unsigned long arg3, | |
643 | unsigned long arg4, | |
644 | unsigned long arg5) = entry->func; | |
645 | unsigned long args[6]; | |
646 | ||
647 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 648 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
649 | args[3], args[4], args[5]); |
650 | break; | |
651 | } | |
652 | default: | |
653 | break; | |
654 | } | |
655 | } | |
656 | ||
2a0c4816 | 657 | /* noinline to diminish caller stack size */ |
49c50022 MD |
658 | static |
659 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
660 | struct lttng_event **chan_table, struct lttng_channel *chan, |
661 | void *filter, enum sc_type type) | |
259b6cb3 | 662 | { |
2a0c4816 | 663 | const struct lttng_event_desc *desc; |
259b6cb3 | 664 | unsigned int i; |
49c50022 MD |
665 | |
666 | /* Allocate events for each syscall, insert into table */ | |
667 | for (i = 0; i < table_len; i++) { | |
668 | struct lttng_kernel_event ev; | |
2a0c4816 | 669 | desc = table[i].desc; |
49c50022 MD |
670 | |
671 | if (!desc) { | |
672 | /* Unknown syscall */ | |
673 | continue; | |
674 | } | |
675 | /* | |
676 | * Skip those already populated by previous failed | |
677 | * register for this channel. | |
678 | */ | |
679 | if (chan_table[i]) | |
680 | continue; | |
681 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
682 | switch (type) { |
683 | case SC_TYPE_ENTRY: | |
684 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
685 | LTTNG_KERNEL_SYM_NAME_LEN); | |
686 | break; | |
687 | case SC_TYPE_EXIT: | |
688 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
689 | LTTNG_KERNEL_SYM_NAME_LEN); | |
690 | break; | |
691 | case SC_TYPE_COMPAT_ENTRY: | |
692 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
693 | LTTNG_KERNEL_SYM_NAME_LEN); | |
694 | break; | |
695 | case SC_TYPE_COMPAT_EXIT: | |
696 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
697 | LTTNG_KERNEL_SYM_NAME_LEN); | |
698 | break; | |
699 | default: | |
700 | BUG_ON(1); | |
701 | break; | |
702 | } | |
703 | strncat(ev.name, desc->name, | |
704 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 705 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
49c50022 | 706 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 707 | chan_table[i] = lttng_event_create(chan, &ev, filter, |
49c50022 | 708 | desc); |
abc0446a MD |
709 | WARN_ON_ONCE(!chan_table[i]); |
710 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
711 | /* |
712 | * If something goes wrong in event registration | |
713 | * after the first one, we have no choice but to | |
714 | * leave the previous events in there, until | |
715 | * deleted by session teardown. | |
716 | */ | |
abc0446a | 717 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
718 | } |
719 | } | |
720 | return 0; | |
721 | } | |
722 | ||
a90917c3 | 723 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 724 | { |
2a0c4816 | 725 | struct lttng_kernel_event ev; |
259b6cb3 MD |
726 | int ret; |
727 | ||
728 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
729 | |
730 | if (!chan->sc_table) { | |
731 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 732 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
733 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
734 | if (!chan->sc_table) | |
735 | return -ENOMEM; | |
736 | } | |
5b7ac358 MD |
737 | if (!chan->sc_exit_table) { |
738 | /* create syscall table mapping syscall to events */ | |
739 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
740 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
741 | if (!chan->sc_exit_table) | |
742 | return -ENOMEM; | |
743 | } | |
744 | ||
259b6cb3 | 745 | |
49c50022 MD |
746 | #ifdef CONFIG_COMPAT |
747 | if (!chan->compat_sc_table) { | |
748 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 749 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 750 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
751 | if (!chan->compat_sc_table) |
752 | return -ENOMEM; | |
753 | } | |
5b7ac358 MD |
754 | |
755 | if (!chan->compat_sc_exit_table) { | |
756 | /* create syscall table mapping compat syscall to events */ | |
757 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
758 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
759 | if (!chan->compat_sc_exit_table) | |
760 | return -ENOMEM; | |
761 | } | |
49c50022 | 762 | #endif |
f405cfce | 763 | if (!chan->sc_unknown) { |
f405cfce | 764 | const struct lttng_event_desc *desc = |
5b7ac358 | 765 | &__event_desc___syscall_enter_unknown; |
2f804c0a | 766 | |
f405cfce | 767 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
768 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
769 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f405cfce | 770 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 771 | chan->sc_unknown = lttng_event_create(chan, &ev, filter, |
f405cfce | 772 | desc); |
abc0446a MD |
773 | WARN_ON_ONCE(!chan->sc_unknown); |
774 | if (IS_ERR(chan->sc_unknown)) { | |
775 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
776 | } |
777 | } | |
778 | ||
b76dc1a0 | 779 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 780 | const struct lttng_event_desc *desc = |
5b7ac358 | 781 | &__event_desc___compat_syscall_enter_unknown; |
b76dc1a0 MD |
782 | |
783 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
784 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
785 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
b76dc1a0 | 786 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 787 | chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter, |
b76dc1a0 | 788 | desc); |
abc0446a MD |
789 | WARN_ON_ONCE(!chan->sc_unknown); |
790 | if (IS_ERR(chan->sc_compat_unknown)) { | |
791 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
792 | } |
793 | } | |
794 | ||
5b7ac358 | 795 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 796 | const struct lttng_event_desc *desc = |
5b7ac358 | 797 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
798 | |
799 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
800 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
801 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2f804c0a | 802 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
5b7ac358 MD |
803 | chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev, |
804 | filter, desc); | |
805 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); | |
806 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
807 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
808 | } | |
809 | } | |
810 | ||
811 | if (!chan->sc_exit_unknown) { | |
812 | const struct lttng_event_desc *desc = | |
813 | &__event_desc___syscall_exit_unknown; | |
814 | ||
815 | memset(&ev, 0, sizeof(ev)); | |
816 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
817 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
818 | ev.instrumentation = LTTNG_KERNEL_NOOP; | |
819 | chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter, | |
2f804c0a | 820 | desc); |
5b7ac358 MD |
821 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
822 | if (IS_ERR(chan->sc_exit_unknown)) { | |
823 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
824 | } |
825 | } | |
826 | ||
49c50022 | 827 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
828 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
829 | if (ret) | |
830 | return ret; | |
831 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
832 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
833 | if (ret) |
834 | return ret; | |
5b7ac358 | 835 | |
49c50022 | 836 | #ifdef CONFIG_COMPAT |
a93244f8 | 837 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
838 | chan->compat_sc_table, chan, filter, |
839 | SC_TYPE_COMPAT_ENTRY); | |
840 | if (ret) | |
841 | return ret; | |
842 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
843 | chan->compat_sc_exit_table, chan, filter, | |
844 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
845 | if (ret) |
846 | return ret; | |
847 | #endif | |
80f87dd2 MD |
848 | if (!chan->sys_enter_registered) { |
849 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
850 | (void *) syscall_entry_probe, chan); | |
851 | if (ret) | |
852 | return ret; | |
853 | chan->sys_enter_registered = 1; | |
854 | } | |
63728b02 MD |
855 | /* |
856 | * We change the name of sys_exit tracepoint due to namespace | |
857 | * conflict with sys_exit syscall entry. | |
858 | */ | |
80f87dd2 MD |
859 | if (!chan->sys_exit_registered) { |
860 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 861 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
862 | if (ret) { |
863 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
864 | (void *) syscall_entry_probe, chan)); | |
865 | return ret; | |
866 | } | |
867 | chan->sys_exit_registered = 1; | |
63728b02 | 868 | } |
259b6cb3 MD |
869 | return ret; |
870 | } | |
871 | ||
872 | /* | |
873 | * Only called at session destruction. | |
874 | */ | |
a90917c3 | 875 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
876 | { |
877 | int ret; | |
878 | ||
879 | if (!chan->sc_table) | |
880 | return 0; | |
80f87dd2 MD |
881 | if (chan->sys_enter_registered) { |
882 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 883 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
884 | if (ret) |
885 | return ret; | |
886 | chan->sys_enter_registered = 0; | |
887 | } | |
888 | if (chan->sys_exit_registered) { | |
889 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
890 | (void *) syscall_entry_probe, chan); | |
891 | if (ret) | |
892 | return ret; | |
893 | chan->sys_exit_registered = 0; | |
894 | } | |
a90917c3 | 895 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 896 | kfree(chan->sc_table); |
5b7ac358 | 897 | kfree(chan->sc_exit_table); |
49c50022 MD |
898 | #ifdef CONFIG_COMPAT |
899 | kfree(chan->compat_sc_table); | |
5b7ac358 | 900 | kfree(chan->compat_sc_exit_table); |
49c50022 | 901 | #endif |
80f87dd2 MD |
902 | kfree(chan->sc_filter); |
903 | return 0; | |
904 | } | |
905 | ||
906 | static | |
907 | int get_syscall_nr(const char *syscall_name) | |
908 | { | |
909 | int syscall_nr = -1; | |
910 | int i; | |
911 | ||
912 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
913 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 914 | const char *it_name; |
80f87dd2 MD |
915 | |
916 | entry = &sc_table[i]; | |
917 | if (!entry->desc) | |
918 | continue; | |
5b7ac358 MD |
919 | it_name = entry->desc->name; |
920 | it_name += strlen(SYSCALL_ENTRY_STR); | |
921 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
922 | syscall_nr = i; |
923 | break; | |
924 | } | |
925 | } | |
926 | return syscall_nr; | |
927 | } | |
928 | ||
929 | static | |
930 | int get_compat_syscall_nr(const char *syscall_name) | |
931 | { | |
932 | int syscall_nr = -1; | |
933 | int i; | |
934 | ||
935 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
936 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 937 | const char *it_name; |
80f87dd2 MD |
938 | |
939 | entry = &compat_sc_table[i]; | |
940 | if (!entry->desc) | |
941 | continue; | |
5b7ac358 MD |
942 | it_name = entry->desc->name; |
943 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
944 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
945 | syscall_nr = i; |
946 | break; | |
947 | } | |
948 | } | |
949 | return syscall_nr; | |
950 | } | |
951 | ||
952 | int lttng_syscall_filter_enable(struct lttng_channel *chan, | |
953 | const char *name) | |
954 | { | |
955 | int syscall_nr, compat_syscall_nr, ret; | |
956 | struct lttng_syscall_filter *filter; | |
957 | ||
958 | WARN_ON_ONCE(!chan->sc_table); | |
959 | ||
960 | if (!name) { | |
961 | /* Enable all system calls by removing filter */ | |
962 | if (chan->sc_filter) { | |
963 | filter = chan->sc_filter; | |
964 | rcu_assign_pointer(chan->sc_filter, NULL); | |
965 | synchronize_trace(); | |
966 | kfree(filter); | |
967 | } | |
968 | chan->syscall_all = 1; | |
969 | return 0; | |
970 | } | |
971 | ||
972 | if (!chan->sc_filter) { | |
973 | if (chan->syscall_all) { | |
974 | /* | |
975 | * All syscalls are already enabled. | |
976 | */ | |
977 | return -EEXIST; | |
978 | } | |
979 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
980 | GFP_KERNEL); | |
981 | if (!filter) | |
982 | return -ENOMEM; | |
983 | } else { | |
984 | filter = chan->sc_filter; | |
985 | } | |
986 | syscall_nr = get_syscall_nr(name); | |
987 | compat_syscall_nr = get_compat_syscall_nr(name); | |
988 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
989 | ret = -ENOENT; | |
990 | goto error; | |
991 | } | |
992 | if (syscall_nr >= 0) { | |
993 | if (test_bit(syscall_nr, filter->sc)) { | |
994 | ret = -EEXIST; | |
995 | goto error; | |
996 | } | |
997 | bitmap_set(filter->sc, syscall_nr, 1); | |
998 | } | |
999 | if (compat_syscall_nr >= 0) { | |
1000 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1001 | ret = -EEXIST; | |
1002 | goto error; | |
1003 | } | |
1004 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1005 | } | |
1006 | if (!chan->sc_filter) | |
1007 | rcu_assign_pointer(chan->sc_filter, filter); | |
1008 | return 0; | |
1009 | ||
1010 | error: | |
1011 | if (!chan->sc_filter) | |
1012 | kfree(filter); | |
1013 | return ret; | |
1014 | } | |
1015 | ||
1016 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1017 | const char *name) | |
1018 | { | |
1019 | int syscall_nr, compat_syscall_nr, ret; | |
1020 | struct lttng_syscall_filter *filter; | |
1021 | ||
1022 | WARN_ON_ONCE(!chan->sc_table); | |
1023 | ||
1024 | if (!chan->sc_filter) { | |
1025 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1026 | GFP_KERNEL); | |
1027 | if (!filter) | |
1028 | return -ENOMEM; | |
1029 | /* Trace all system calls, then apply disable. */ | |
1030 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1031 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1032 | } else { | |
1033 | filter = chan->sc_filter; | |
1034 | } | |
1035 | ||
1036 | syscall_nr = get_syscall_nr(name); | |
1037 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1038 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1039 | ret = -ENOENT; | |
1040 | goto error; | |
1041 | } | |
1042 | if (syscall_nr >= 0) { | |
1043 | if (!test_bit(syscall_nr, chan->sc_filter->sc)) { | |
1044 | ret = -EEXIST; | |
1045 | goto error; | |
1046 | } | |
1047 | bitmap_clear(chan->sc_filter->sc, syscall_nr, 1); | |
1048 | } | |
1049 | if (compat_syscall_nr >= 0) { | |
1050 | if (!test_bit(compat_syscall_nr, chan->sc_filter->sc_compat)) { | |
1051 | ret = -EEXIST; | |
1052 | goto error; | |
1053 | } | |
1054 | bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1); | |
1055 | } | |
1056 | if (!chan->sc_filter) | |
1057 | rcu_assign_pointer(chan->sc_filter, filter); | |
1058 | chan->syscall_all = 0; | |
259b6cb3 | 1059 | return 0; |
80f87dd2 MD |
1060 | |
1061 | error: | |
1062 | if (!chan->sc_filter) | |
1063 | kfree(filter); | |
1064 | return ret; | |
259b6cb3 | 1065 | } |