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> | |
2d2464bd | 30 | #include <linux/seq_file.h> |
259b6cb3 MD |
31 | #include <asm/ptrace.h> |
32 | #include <asm/syscall.h> | |
33 | ||
3a523f5b | 34 | #include "wrapper/tracepoint.h" |
a90917c3 | 35 | #include "lttng-events.h" |
259b6cb3 | 36 | |
6333ace3 | 37 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
38 | # ifndef is_compat_task |
39 | # define is_compat_task() (0) | |
40 | # endif | |
6333ace3 MD |
41 | #endif |
42 | ||
5b7ac358 MD |
43 | enum sc_type { |
44 | SC_TYPE_ENTRY, | |
45 | SC_TYPE_EXIT, | |
46 | SC_TYPE_COMPAT_ENTRY, | |
47 | SC_TYPE_COMPAT_EXIT, | |
48 | }; | |
49 | ||
50 | #define SYSCALL_ENTRY_STR "syscall_entry_" | |
51 | #define COMPAT_SYSCALL_ENTRY_STR "compat_syscall_entry_" | |
52 | #define SYSCALL_EXIT_STR "syscall_exit_" | |
53 | #define COMPAT_SYSCALL_EXIT_STR "compat_syscall_exit_" | |
54 | ||
a93244f8 | 55 | static |
2faf7d1b | 56 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
57 | static |
58 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 59 | |
3a523f5b MD |
60 | /* |
61 | * Forward declarations for old kernels. | |
62 | */ | |
63 | struct mmsghdr; | |
64 | struct rlimit64; | |
65 | struct oldold_utsname; | |
66 | struct old_utsname; | |
67 | struct sel_arg_struct; | |
68 | struct mmap_arg_struct; | |
69 | ||
80f87dd2 MD |
70 | #ifdef IA32_NR_syscalls |
71 | #define NR_compat_syscalls IA32_NR_syscalls | |
72 | #else | |
73 | #define NR_compat_syscalls NR_syscalls | |
74 | #endif | |
75 | ||
259b6cb3 MD |
76 | /* |
77 | * Create LTTng tracepoint probes. | |
78 | */ | |
79 | #define LTTNG_PACKAGE_BUILD | |
80 | #define CREATE_TRACE_POINTS | |
2655f9ad | 81 | #define TP_MODULE_NOINIT |
2f804c0a | 82 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 83 | |
a93244f8 MD |
84 | #define PARAMS(args...) args |
85 | ||
5b7ac358 MD |
86 | /* Handle unknown syscalls */ |
87 | #define TRACE_SYSTEM syscalls_unknown | |
88 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
89 | #undef TRACE_SYSTEM | |
90 | ||
fc4f7161 MD |
91 | #define SC_ENTER |
92 | ||
fc4f7161 MD |
93 | #undef sc_exit |
94 | #define sc_exit(...) | |
b75d00c4 MD |
95 | #undef sc_in |
96 | #define sc_in(...) __VA_ARGS__ | |
97 | #undef sc_out | |
98 | #define sc_out(...) | |
99 | #undef sc_inout | |
100 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
101 | |
102 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 103 | #undef TP_PROBE_CB |
259b6cb3 | 104 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 105 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 106 | LTTNG_TRACEPOINT_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 | 107 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c MD |
108 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
109 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ | |
110 | PARAMS(_locvar), PARAMS(_code), \ | |
7ca580f8 | 111 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 112 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 113 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_enter_##_name, PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 114 | PARAMS(_printk)) |
cb3ef14c | 115 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 116 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_enter_##_template, syscall_enter_##_name) |
a93244f8 | 117 | #undef TRACE_SYSTEM |
5b7ac358 MD |
118 | #define TRACE_SYSTEM syscall_enter_integers |
119 | #define TRACE_INCLUDE_FILE syscalls_integers | |
177b3692 | 120 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 121 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 122 | #undef TRACE_SYSTEM |
5b7ac358 MD |
123 | #define TRACE_SYSTEM syscall_enter_pointers |
124 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
177b3692 | 125 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 126 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 127 | #undef TRACE_SYSTEM |
cb3ef14c MD |
128 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
129 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
130 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
131 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 132 | #undef TP_PROBE_CB |
3bc29f0a MD |
133 | #undef _TRACE_SYSCALLS_INTEGERS_H |
134 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
135 | |
136 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 137 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 138 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 139 | LTTNG_TRACEPOINT_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 140 | PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 141 | PARAMS(_printk)) |
cb3ef14c | 142 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 143 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 144 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 145 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 146 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 147 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_enter_##_name, PARAMS(_struct), \ |
5b7ac358 | 148 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 149 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 150 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_enter_##_template, \ |
5b7ac358 MD |
151 | compat_syscall_enter_##_name) |
152 | #define TRACE_SYSTEM compat_syscall_enter_integers | |
153 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
154 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
155 | #undef TRACE_INCLUDE_FILE | |
156 | #undef TRACE_SYSTEM | |
157 | #define TRACE_SYSTEM compat_syscall_enter_pointers | |
158 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
159 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
160 | #undef TRACE_INCLUDE_FILE | |
161 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
162 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
163 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
164 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
165 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 166 | #undef TP_PROBE_CB |
3bc29f0a MD |
167 | #undef _TRACE_SYSCALLS_INTEGERS_H |
168 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 169 | |
fc4f7161 MD |
170 | #undef SC_ENTER |
171 | ||
172 | #define SC_EXIT | |
173 | ||
fc4f7161 MD |
174 | #undef sc_exit |
175 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
176 | #undef sc_in |
177 | #define sc_in(...) | |
178 | #undef sc_out | |
179 | #define sc_out(...) __VA_ARGS__ | |
180 | #undef sc_inout | |
181 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
182 | |
183 | /* Hijack probe callback for system call exit */ | |
184 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 185 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 186 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 187 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 188 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 189 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 190 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 191 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 192 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 193 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \ |
5b7ac358 | 194 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c MD |
195 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
196 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 MD |
197 | syscall_exit_##_name) |
198 | #define TRACE_SYSTEM syscall_exit_integers | |
199 | #define TRACE_INCLUDE_FILE syscalls_integers | |
200 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
201 | #undef TRACE_INCLUDE_FILE | |
202 | #undef TRACE_SYSTEM | |
203 | #define TRACE_SYSTEM syscall_exit_pointers | |
204 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
205 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
206 | #undef TRACE_INCLUDE_FILE | |
207 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
208 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
209 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
210 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
211 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 212 | #undef TP_PROBE_CB |
3bc29f0a MD |
213 | #undef _TRACE_SYSCALLS_INTEGERS_H |
214 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
215 | |
216 | ||
217 | /* Hijack probe callback for compat system call exit */ | |
218 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 219 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 220 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 221 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 222 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 223 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 224 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 225 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 226 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 227 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \ |
a93244f8 | 228 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 229 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 230 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 MD |
231 | compat_syscall_exit_##_name) |
232 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
233 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 234 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 235 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 236 | #undef TRACE_SYSTEM |
5b7ac358 MD |
237 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
238 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 239 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 240 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 241 | #undef TRACE_SYSTEM |
cb3ef14c MD |
242 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
243 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
244 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
245 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 246 | #undef TP_PROBE_CB |
3bc29f0a MD |
247 | #undef _TRACE_SYSCALLS_INTEGERS_H |
248 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 249 | |
fc4f7161 | 250 | #undef SC_EXIT |
259b6cb3 | 251 | |
2655f9ad | 252 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
253 | #undef LTTNG_PACKAGE_BUILD |
254 | #undef CREATE_TRACE_POINTS | |
255 | ||
a93244f8 MD |
256 | struct trace_syscall_entry { |
257 | void *func; | |
258 | const struct lttng_event_desc *desc; | |
259 | const struct lttng_event_field *fields; | |
260 | unsigned int nrargs; | |
261 | }; | |
262 | ||
263 | #define CREATE_SYSCALL_TABLE | |
264 | ||
fc4f7161 MD |
265 | #define SC_ENTER |
266 | ||
267 | #undef sc_exit | |
268 | #define sc_exit(...) | |
269 | ||
259b6cb3 | 270 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 271 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 272 | [ _nr ] = { \ |
5b7ac358 | 273 | .func = __event_probe__syscall_enter_##_template, \ |
259b6cb3 | 274 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
275 | .fields = __event_fields___syscall_enter_##_template, \ |
276 | .desc = &__event_desc___syscall_enter_##_name, \ | |
259b6cb3 MD |
277 | }, |
278 | ||
5b7ac358 | 279 | /* Syscall enter tracing table */ |
49c50022 | 280 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
281 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
282 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
283 | }; |
284 | ||
a93244f8 MD |
285 | #undef TRACE_SYSCALL_TABLE |
286 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
287 | [ _nr ] = { \ | |
5b7ac358 | 288 | .func = __event_probe__compat_syscall_enter_##_template, \ |
a93244f8 | 289 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
290 | .fields = __event_fields___compat_syscall_enter_##_template, \ |
291 | .desc = &__event_desc___compat_syscall_enter_##_name, \ | |
a93244f8 MD |
292 | }, |
293 | ||
5b7ac358 | 294 | /* Compat syscall enter table */ |
a93244f8 MD |
295 | const struct trace_syscall_entry compat_sc_table[] = { |
296 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
297 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
298 | }; | |
259b6cb3 | 299 | |
fc4f7161 MD |
300 | #undef SC_ENTER |
301 | ||
302 | #define SC_EXIT | |
303 | ||
304 | #undef sc_exit | |
305 | #define sc_exit(...) __VA_ARGS__ | |
306 | ||
5b7ac358 MD |
307 | #undef TRACE_SYSCALL_TABLE |
308 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
309 | [ _nr ] = { \ | |
310 | .func = __event_probe__syscall_exit_##_template, \ | |
311 | .nrargs = (_nrargs), \ | |
312 | .fields = __event_fields___syscall_exit_##_template, \ | |
313 | .desc = &__event_desc___syscall_exit_##_name, \ | |
314 | }, | |
315 | ||
316 | /* Syscall exit table */ | |
317 | static const struct trace_syscall_entry sc_exit_table[] = { | |
318 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
319 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
320 | }; | |
321 | ||
322 | #undef TRACE_SYSCALL_TABLE | |
323 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
324 | [ _nr ] = { \ | |
325 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
326 | .nrargs = (_nrargs), \ | |
327 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
328 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
329 | }, | |
330 | ||
331 | /* Compat syscall exit table */ | |
332 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
333 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
334 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
335 | }; | |
336 | ||
fc4f7161 MD |
337 | #undef SC_EXIT |
338 | ||
a93244f8 | 339 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 340 | |
80f87dd2 MD |
341 | struct lttng_syscall_filter { |
342 | DECLARE_BITMAP(sc, NR_syscalls); | |
343 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
344 | }; | |
345 | ||
a90917c3 | 346 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
347 | struct pt_regs *regs, unsigned int id) |
348 | { | |
349 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 350 | |
f405cfce | 351 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 352 | if (unlikely(is_compat_task())) |
5b7ac358 | 353 | __event_probe__compat_syscall_enter_unknown(event, id, args); |
a93244f8 | 354 | else |
5b7ac358 | 355 | __event_probe__syscall_enter_unknown(event, id, args); |
f405cfce MD |
356 | } |
357 | ||
2faf7d1b | 358 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 359 | { |
a90917c3 MD |
360 | struct lttng_channel *chan = __data; |
361 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
362 | const struct trace_syscall_entry *table, *entry; |
363 | size_t table_len; | |
259b6cb3 | 364 | |
b76dc1a0 | 365 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
366 | struct lttng_syscall_filter *filter; |
367 | ||
368 | filter = rcu_dereference(chan->sc_filter); | |
369 | if (filter) { | |
370 | if (id >= NR_compat_syscalls | |
371 | || !test_bit(id, filter->sc_compat)) { | |
372 | /* System call filtered out. */ | |
373 | return; | |
374 | } | |
375 | } | |
49c50022 | 376 | table = compat_sc_table; |
a93244f8 | 377 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
378 | unknown_event = chan->sc_compat_unknown; |
379 | } else { | |
80f87dd2 MD |
380 | struct lttng_syscall_filter *filter; |
381 | ||
382 | filter = rcu_dereference(chan->sc_filter); | |
383 | if (filter) { | |
384 | if (id >= NR_syscalls | |
385 | || !test_bit(id, filter->sc)) { | |
386 | /* System call filtered out. */ | |
387 | return; | |
388 | } | |
389 | } | |
49c50022 MD |
390 | table = sc_table; |
391 | table_len = ARRAY_SIZE(sc_table); | |
392 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 393 | } |
49c50022 MD |
394 | if (unlikely(id >= table_len)) { |
395 | syscall_entry_unknown(unknown_event, regs, id); | |
259b6cb3 | 396 | return; |
f405cfce | 397 | } |
49c50022 MD |
398 | if (unlikely(is_compat_task())) |
399 | event = chan->compat_sc_table[id]; | |
400 | else | |
401 | event = chan->sc_table[id]; | |
f405cfce | 402 | if (unlikely(!event)) { |
49c50022 | 403 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
404 | return; |
405 | } | |
49c50022 | 406 | entry = &table[id]; |
f405cfce | 407 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
408 | |
409 | switch (entry->nrargs) { | |
410 | case 0: | |
411 | { | |
412 | void (*fptr)(void *__data) = entry->func; | |
413 | ||
414 | fptr(event); | |
415 | break; | |
416 | } | |
417 | case 1: | |
418 | { | |
419 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
420 | unsigned long args[1]; | |
421 | ||
422 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
423 | fptr(event, args[0]); | |
424 | break; | |
425 | } | |
426 | case 2: | |
427 | { | |
428 | void (*fptr)(void *__data, | |
429 | unsigned long arg0, | |
430 | unsigned long arg1) = entry->func; | |
431 | unsigned long args[2]; | |
432 | ||
433 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
434 | fptr(event, args[0], args[1]); | |
435 | break; | |
436 | } | |
437 | case 3: | |
438 | { | |
439 | void (*fptr)(void *__data, | |
440 | unsigned long arg0, | |
441 | unsigned long arg1, | |
442 | unsigned long arg2) = entry->func; | |
443 | unsigned long args[3]; | |
444 | ||
445 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
446 | fptr(event, args[0], args[1], args[2]); | |
447 | break; | |
448 | } | |
449 | case 4: | |
450 | { | |
451 | void (*fptr)(void *__data, | |
452 | unsigned long arg0, | |
453 | unsigned long arg1, | |
454 | unsigned long arg2, | |
455 | unsigned long arg3) = entry->func; | |
456 | unsigned long args[4]; | |
457 | ||
458 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
459 | fptr(event, args[0], args[1], args[2], args[3]); | |
460 | break; | |
461 | } | |
462 | case 5: | |
463 | { | |
464 | void (*fptr)(void *__data, | |
465 | unsigned long arg0, | |
466 | unsigned long arg1, | |
467 | unsigned long arg2, | |
468 | unsigned long arg3, | |
469 | unsigned long arg4) = entry->func; | |
470 | unsigned long args[5]; | |
471 | ||
472 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
473 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
474 | break; | |
475 | } | |
476 | case 6: | |
477 | { | |
478 | void (*fptr)(void *__data, | |
479 | unsigned long arg0, | |
480 | unsigned long arg1, | |
481 | unsigned long arg2, | |
482 | unsigned long arg3, | |
483 | unsigned long arg4, | |
484 | unsigned long arg5) = entry->func; | |
485 | unsigned long args[6]; | |
486 | ||
487 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
488 | fptr(event, args[0], args[1], args[2], | |
489 | args[3], args[4], args[5]); | |
490 | break; | |
491 | } | |
492 | default: | |
493 | break; | |
494 | } | |
495 | } | |
496 | ||
5b7ac358 MD |
497 | static void syscall_exit_unknown(struct lttng_event *event, |
498 | struct pt_regs *regs, unsigned int id, long ret) | |
499 | { | |
500 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
501 | ||
502 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
503 | if (unlikely(is_compat_task())) | |
504 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
505 | args); | |
506 | else | |
507 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
508 | } | |
509 | ||
510 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
511 | { | |
512 | struct lttng_channel *chan = __data; | |
513 | struct lttng_event *event, *unknown_event; | |
514 | const struct trace_syscall_entry *table, *entry; | |
515 | size_t table_len; | |
516 | long id; | |
517 | ||
518 | id = syscall_get_nr(current, regs); | |
519 | if (unlikely(is_compat_task())) { | |
520 | struct lttng_syscall_filter *filter; | |
521 | ||
522 | filter = rcu_dereference(chan->sc_filter); | |
523 | if (filter) { | |
524 | if (id >= NR_compat_syscalls | |
525 | || !test_bit(id, filter->sc_compat)) { | |
526 | /* System call filtered out. */ | |
527 | return; | |
528 | } | |
529 | } | |
530 | table = compat_sc_exit_table; | |
531 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
532 | unknown_event = chan->compat_sc_exit_unknown; | |
533 | } else { | |
534 | struct lttng_syscall_filter *filter; | |
535 | ||
536 | filter = rcu_dereference(chan->sc_filter); | |
537 | if (filter) { | |
538 | if (id >= NR_syscalls | |
539 | || !test_bit(id, filter->sc)) { | |
540 | /* System call filtered out. */ | |
541 | return; | |
542 | } | |
543 | } | |
544 | table = sc_exit_table; | |
545 | table_len = ARRAY_SIZE(sc_exit_table); | |
546 | unknown_event = chan->sc_exit_unknown; | |
547 | } | |
548 | if (unlikely(id >= table_len)) { | |
549 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
550 | return; | |
551 | } | |
552 | if (unlikely(is_compat_task())) | |
553 | event = chan->compat_sc_exit_table[id]; | |
554 | else | |
555 | event = chan->sc_exit_table[id]; | |
556 | if (unlikely(!event)) { | |
557 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
558 | return; | |
559 | } | |
560 | entry = &table[id]; | |
561 | WARN_ON_ONCE(!entry); | |
562 | ||
563 | switch (entry->nrargs) { | |
564 | case 0: | |
565 | { | |
fc4f7161 | 566 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 567 | |
fc4f7161 | 568 | fptr(event, ret); |
5b7ac358 MD |
569 | break; |
570 | } | |
571 | case 1: | |
572 | { | |
573 | void (*fptr)(void *__data, | |
fc4f7161 | 574 | long ret, |
5b7ac358 MD |
575 | unsigned long arg0) = entry->func; |
576 | unsigned long args[1]; | |
577 | ||
578 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 579 | fptr(event, ret, args[0]); |
5b7ac358 MD |
580 | break; |
581 | } | |
582 | case 2: | |
583 | { | |
584 | void (*fptr)(void *__data, | |
fc4f7161 | 585 | long ret, |
5b7ac358 MD |
586 | unsigned long arg0, |
587 | unsigned long arg1) = entry->func; | |
588 | unsigned long args[2]; | |
589 | ||
590 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 591 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
592 | break; |
593 | } | |
594 | case 3: | |
595 | { | |
596 | void (*fptr)(void *__data, | |
fc4f7161 | 597 | long ret, |
5b7ac358 MD |
598 | unsigned long arg0, |
599 | unsigned long arg1, | |
600 | unsigned long arg2) = entry->func; | |
601 | unsigned long args[3]; | |
602 | ||
603 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 604 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
605 | break; |
606 | } | |
607 | case 4: | |
608 | { | |
609 | void (*fptr)(void *__data, | |
fc4f7161 | 610 | long ret, |
5b7ac358 MD |
611 | unsigned long arg0, |
612 | unsigned long arg1, | |
613 | unsigned long arg2, | |
614 | unsigned long arg3) = entry->func; | |
615 | unsigned long args[4]; | |
616 | ||
617 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 618 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
619 | break; |
620 | } | |
621 | case 5: | |
622 | { | |
623 | void (*fptr)(void *__data, | |
fc4f7161 | 624 | long ret, |
5b7ac358 MD |
625 | unsigned long arg0, |
626 | unsigned long arg1, | |
627 | unsigned long arg2, | |
628 | unsigned long arg3, | |
629 | unsigned long arg4) = entry->func; | |
630 | unsigned long args[5]; | |
631 | ||
632 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 633 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
634 | break; |
635 | } | |
636 | case 6: | |
637 | { | |
638 | void (*fptr)(void *__data, | |
fc4f7161 | 639 | long ret, |
5b7ac358 MD |
640 | unsigned long arg0, |
641 | unsigned long arg1, | |
642 | unsigned long arg2, | |
643 | unsigned long arg3, | |
644 | unsigned long arg4, | |
645 | unsigned long arg5) = entry->func; | |
646 | unsigned long args[6]; | |
647 | ||
648 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 649 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
650 | args[3], args[4], args[5]); |
651 | break; | |
652 | } | |
653 | default: | |
654 | break; | |
655 | } | |
656 | } | |
657 | ||
2a0c4816 | 658 | /* noinline to diminish caller stack size */ |
49c50022 MD |
659 | static |
660 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
661 | struct lttng_event **chan_table, struct lttng_channel *chan, |
662 | void *filter, enum sc_type type) | |
259b6cb3 | 663 | { |
2a0c4816 | 664 | const struct lttng_event_desc *desc; |
259b6cb3 | 665 | unsigned int i; |
49c50022 MD |
666 | |
667 | /* Allocate events for each syscall, insert into table */ | |
668 | for (i = 0; i < table_len; i++) { | |
669 | struct lttng_kernel_event ev; | |
2a0c4816 | 670 | desc = table[i].desc; |
49c50022 MD |
671 | |
672 | if (!desc) { | |
673 | /* Unknown syscall */ | |
674 | continue; | |
675 | } | |
676 | /* | |
677 | * Skip those already populated by previous failed | |
678 | * register for this channel. | |
679 | */ | |
680 | if (chan_table[i]) | |
681 | continue; | |
682 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
683 | switch (type) { |
684 | case SC_TYPE_ENTRY: | |
685 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
686 | LTTNG_KERNEL_SYM_NAME_LEN); | |
687 | break; | |
688 | case SC_TYPE_EXIT: | |
689 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
690 | LTTNG_KERNEL_SYM_NAME_LEN); | |
691 | break; | |
692 | case SC_TYPE_COMPAT_ENTRY: | |
693 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
694 | LTTNG_KERNEL_SYM_NAME_LEN); | |
695 | break; | |
696 | case SC_TYPE_COMPAT_EXIT: | |
697 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
698 | LTTNG_KERNEL_SYM_NAME_LEN); | |
699 | break; | |
700 | default: | |
701 | BUG_ON(1); | |
702 | break; | |
703 | } | |
704 | strncat(ev.name, desc->name, | |
705 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 706 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
49c50022 | 707 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 708 | chan_table[i] = lttng_event_create(chan, &ev, filter, |
49c50022 | 709 | desc); |
abc0446a MD |
710 | WARN_ON_ONCE(!chan_table[i]); |
711 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
712 | /* |
713 | * If something goes wrong in event registration | |
714 | * after the first one, we have no choice but to | |
715 | * leave the previous events in there, until | |
716 | * deleted by session teardown. | |
717 | */ | |
abc0446a | 718 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
719 | } |
720 | } | |
721 | return 0; | |
722 | } | |
723 | ||
a90917c3 | 724 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 725 | { |
2a0c4816 | 726 | struct lttng_kernel_event ev; |
259b6cb3 MD |
727 | int ret; |
728 | ||
729 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
730 | |
731 | if (!chan->sc_table) { | |
732 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 733 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
734 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
735 | if (!chan->sc_table) | |
736 | return -ENOMEM; | |
737 | } | |
5b7ac358 MD |
738 | if (!chan->sc_exit_table) { |
739 | /* create syscall table mapping syscall to events */ | |
740 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
741 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
742 | if (!chan->sc_exit_table) | |
743 | return -ENOMEM; | |
744 | } | |
745 | ||
259b6cb3 | 746 | |
49c50022 MD |
747 | #ifdef CONFIG_COMPAT |
748 | if (!chan->compat_sc_table) { | |
749 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 750 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 751 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
752 | if (!chan->compat_sc_table) |
753 | return -ENOMEM; | |
754 | } | |
5b7ac358 MD |
755 | |
756 | if (!chan->compat_sc_exit_table) { | |
757 | /* create syscall table mapping compat syscall to events */ | |
758 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
759 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
760 | if (!chan->compat_sc_exit_table) | |
761 | return -ENOMEM; | |
762 | } | |
49c50022 | 763 | #endif |
f405cfce | 764 | if (!chan->sc_unknown) { |
f405cfce | 765 | const struct lttng_event_desc *desc = |
5b7ac358 | 766 | &__event_desc___syscall_enter_unknown; |
2f804c0a | 767 | |
f405cfce | 768 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
769 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
770 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f405cfce | 771 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 772 | chan->sc_unknown = lttng_event_create(chan, &ev, filter, |
f405cfce | 773 | desc); |
abc0446a MD |
774 | WARN_ON_ONCE(!chan->sc_unknown); |
775 | if (IS_ERR(chan->sc_unknown)) { | |
776 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
777 | } |
778 | } | |
779 | ||
b76dc1a0 | 780 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 781 | const struct lttng_event_desc *desc = |
5b7ac358 | 782 | &__event_desc___compat_syscall_enter_unknown; |
b76dc1a0 MD |
783 | |
784 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
785 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
786 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
b76dc1a0 | 787 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 788 | chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter, |
b76dc1a0 | 789 | desc); |
abc0446a MD |
790 | WARN_ON_ONCE(!chan->sc_unknown); |
791 | if (IS_ERR(chan->sc_compat_unknown)) { | |
792 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
793 | } |
794 | } | |
795 | ||
5b7ac358 | 796 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 797 | const struct lttng_event_desc *desc = |
5b7ac358 | 798 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
799 | |
800 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
801 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
802 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2f804c0a | 803 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
5b7ac358 MD |
804 | chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev, |
805 | filter, desc); | |
806 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); | |
807 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
808 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
809 | } | |
810 | } | |
811 | ||
812 | if (!chan->sc_exit_unknown) { | |
813 | const struct lttng_event_desc *desc = | |
814 | &__event_desc___syscall_exit_unknown; | |
815 | ||
816 | memset(&ev, 0, sizeof(ev)); | |
817 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
818 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
819 | ev.instrumentation = LTTNG_KERNEL_NOOP; | |
820 | chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter, | |
2f804c0a | 821 | desc); |
5b7ac358 MD |
822 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
823 | if (IS_ERR(chan->sc_exit_unknown)) { | |
824 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
825 | } |
826 | } | |
827 | ||
49c50022 | 828 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
829 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
830 | if (ret) | |
831 | return ret; | |
832 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
833 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
834 | if (ret) |
835 | return ret; | |
5b7ac358 | 836 | |
49c50022 | 837 | #ifdef CONFIG_COMPAT |
a93244f8 | 838 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
839 | chan->compat_sc_table, chan, filter, |
840 | SC_TYPE_COMPAT_ENTRY); | |
841 | if (ret) | |
842 | return ret; | |
843 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
844 | chan->compat_sc_exit_table, chan, filter, | |
845 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
846 | if (ret) |
847 | return ret; | |
848 | #endif | |
80f87dd2 MD |
849 | if (!chan->sys_enter_registered) { |
850 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
851 | (void *) syscall_entry_probe, chan); | |
852 | if (ret) | |
853 | return ret; | |
854 | chan->sys_enter_registered = 1; | |
855 | } | |
63728b02 MD |
856 | /* |
857 | * We change the name of sys_exit tracepoint due to namespace | |
858 | * conflict with sys_exit syscall entry. | |
859 | */ | |
80f87dd2 MD |
860 | if (!chan->sys_exit_registered) { |
861 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 862 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
863 | if (ret) { |
864 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
865 | (void *) syscall_entry_probe, chan)); | |
866 | return ret; | |
867 | } | |
868 | chan->sys_exit_registered = 1; | |
63728b02 | 869 | } |
259b6cb3 MD |
870 | return ret; |
871 | } | |
872 | ||
873 | /* | |
874 | * Only called at session destruction. | |
875 | */ | |
a90917c3 | 876 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
877 | { |
878 | int ret; | |
879 | ||
880 | if (!chan->sc_table) | |
881 | return 0; | |
80f87dd2 MD |
882 | if (chan->sys_enter_registered) { |
883 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 884 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
885 | if (ret) |
886 | return ret; | |
887 | chan->sys_enter_registered = 0; | |
888 | } | |
889 | if (chan->sys_exit_registered) { | |
890 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
891 | (void *) syscall_entry_probe, chan); | |
892 | if (ret) | |
893 | return ret; | |
894 | chan->sys_exit_registered = 0; | |
895 | } | |
a90917c3 | 896 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 897 | kfree(chan->sc_table); |
5b7ac358 | 898 | kfree(chan->sc_exit_table); |
49c50022 MD |
899 | #ifdef CONFIG_COMPAT |
900 | kfree(chan->compat_sc_table); | |
5b7ac358 | 901 | kfree(chan->compat_sc_exit_table); |
49c50022 | 902 | #endif |
80f87dd2 MD |
903 | kfree(chan->sc_filter); |
904 | return 0; | |
905 | } | |
906 | ||
907 | static | |
908 | int get_syscall_nr(const char *syscall_name) | |
909 | { | |
910 | int syscall_nr = -1; | |
911 | int i; | |
912 | ||
913 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
914 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 915 | const char *it_name; |
80f87dd2 MD |
916 | |
917 | entry = &sc_table[i]; | |
918 | if (!entry->desc) | |
919 | continue; | |
5b7ac358 MD |
920 | it_name = entry->desc->name; |
921 | it_name += strlen(SYSCALL_ENTRY_STR); | |
922 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
923 | syscall_nr = i; |
924 | break; | |
925 | } | |
926 | } | |
927 | return syscall_nr; | |
928 | } | |
929 | ||
930 | static | |
931 | int get_compat_syscall_nr(const char *syscall_name) | |
932 | { | |
933 | int syscall_nr = -1; | |
934 | int i; | |
935 | ||
936 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
937 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 938 | const char *it_name; |
80f87dd2 MD |
939 | |
940 | entry = &compat_sc_table[i]; | |
941 | if (!entry->desc) | |
942 | continue; | |
5b7ac358 MD |
943 | it_name = entry->desc->name; |
944 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
945 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
946 | syscall_nr = i; |
947 | break; | |
948 | } | |
949 | } | |
950 | return syscall_nr; | |
951 | } | |
952 | ||
953 | int lttng_syscall_filter_enable(struct lttng_channel *chan, | |
954 | const char *name) | |
955 | { | |
956 | int syscall_nr, compat_syscall_nr, ret; | |
957 | struct lttng_syscall_filter *filter; | |
958 | ||
959 | WARN_ON_ONCE(!chan->sc_table); | |
960 | ||
961 | if (!name) { | |
962 | /* Enable all system calls by removing filter */ | |
963 | if (chan->sc_filter) { | |
964 | filter = chan->sc_filter; | |
965 | rcu_assign_pointer(chan->sc_filter, NULL); | |
966 | synchronize_trace(); | |
967 | kfree(filter); | |
968 | } | |
969 | chan->syscall_all = 1; | |
970 | return 0; | |
971 | } | |
972 | ||
973 | if (!chan->sc_filter) { | |
974 | if (chan->syscall_all) { | |
975 | /* | |
976 | * All syscalls are already enabled. | |
977 | */ | |
978 | return -EEXIST; | |
979 | } | |
980 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
981 | GFP_KERNEL); | |
982 | if (!filter) | |
983 | return -ENOMEM; | |
984 | } else { | |
985 | filter = chan->sc_filter; | |
986 | } | |
987 | syscall_nr = get_syscall_nr(name); | |
988 | compat_syscall_nr = get_compat_syscall_nr(name); | |
989 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
990 | ret = -ENOENT; | |
991 | goto error; | |
992 | } | |
993 | if (syscall_nr >= 0) { | |
994 | if (test_bit(syscall_nr, filter->sc)) { | |
995 | ret = -EEXIST; | |
996 | goto error; | |
997 | } | |
998 | bitmap_set(filter->sc, syscall_nr, 1); | |
999 | } | |
1000 | if (compat_syscall_nr >= 0) { | |
1001 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1002 | ret = -EEXIST; | |
1003 | goto error; | |
1004 | } | |
1005 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1006 | } | |
1007 | if (!chan->sc_filter) | |
1008 | rcu_assign_pointer(chan->sc_filter, filter); | |
1009 | return 0; | |
1010 | ||
1011 | error: | |
1012 | if (!chan->sc_filter) | |
1013 | kfree(filter); | |
1014 | return ret; | |
1015 | } | |
1016 | ||
1017 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1018 | const char *name) | |
1019 | { | |
1020 | int syscall_nr, compat_syscall_nr, ret; | |
1021 | struct lttng_syscall_filter *filter; | |
1022 | ||
1023 | WARN_ON_ONCE(!chan->sc_table); | |
1024 | ||
1025 | if (!chan->sc_filter) { | |
1026 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1027 | GFP_KERNEL); | |
1028 | if (!filter) | |
1029 | return -ENOMEM; | |
1030 | /* Trace all system calls, then apply disable. */ | |
1031 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1032 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1033 | } else { | |
1034 | filter = chan->sc_filter; | |
1035 | } | |
1036 | ||
72814741 MD |
1037 | if (!name) { |
1038 | /* Disable all system calls */ | |
1039 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1040 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1041 | goto apply_filter; | |
1042 | } | |
80f87dd2 MD |
1043 | syscall_nr = get_syscall_nr(name); |
1044 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1045 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1046 | ret = -ENOENT; | |
1047 | goto error; | |
1048 | } | |
1049 | if (syscall_nr >= 0) { | |
1050 | if (!test_bit(syscall_nr, chan->sc_filter->sc)) { | |
1051 | ret = -EEXIST; | |
1052 | goto error; | |
1053 | } | |
1054 | bitmap_clear(chan->sc_filter->sc, syscall_nr, 1); | |
1055 | } | |
1056 | if (compat_syscall_nr >= 0) { | |
1057 | if (!test_bit(compat_syscall_nr, chan->sc_filter->sc_compat)) { | |
1058 | ret = -EEXIST; | |
1059 | goto error; | |
1060 | } | |
1061 | bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1); | |
1062 | } | |
72814741 | 1063 | apply_filter: |
80f87dd2 MD |
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 | } |
2d2464bd MD |
1074 | |
1075 | static | |
1076 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1077 | { | |
1078 | const struct trace_syscall_entry *entry; | |
1079 | int iter = 0; | |
1080 | ||
1081 | for (entry = sc_table; | |
1082 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1083 | entry++) { | |
1084 | if (iter++ >= *pos) | |
1085 | return entry; | |
1086 | } | |
1087 | for (entry = compat_sc_table; | |
1088 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1089 | entry++) { | |
1090 | if (iter++ >= *pos) | |
1091 | return entry; | |
1092 | } | |
1093 | /* End of list */ | |
1094 | return NULL; | |
1095 | } | |
1096 | ||
1097 | static | |
1098 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1099 | { | |
1100 | return (void *) syscall_list_get_entry(pos); | |
1101 | } | |
1102 | ||
1103 | static | |
1104 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1105 | { | |
1106 | (*ppos)++; | |
1107 | return (void *) syscall_list_get_entry(ppos); | |
1108 | } | |
1109 | ||
1110 | static | |
1111 | void syscall_list_stop(struct seq_file *m, void *p) | |
1112 | { | |
1113 | } | |
1114 | ||
1115 | static | |
1116 | int syscall_list_show(struct seq_file *m, void *p) | |
1117 | { | |
1118 | const struct trace_syscall_entry *table, *entry = p; | |
1119 | unsigned int bitness; | |
1120 | ||
1121 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1122 | bitness = BITS_PER_LONG; | |
1123 | table = sc_table; | |
1124 | } else { | |
1125 | bitness = 32; | |
1126 | table = compat_sc_table; | |
1127 | WARN_ON_ONCE(!(entry >= compat_sc_table | |
1128 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))); | |
1129 | } | |
9f5226f0 MD |
1130 | seq_printf(m, "syscall { id = %u; name = %s; bitness = %u; };\n", |
1131 | entry - table, | |
2d2464bd MD |
1132 | entry->desc->name, |
1133 | bitness); | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | static | |
1138 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1139 | .start = syscall_list_start, | |
1140 | .next = syscall_list_next, | |
1141 | .stop = syscall_list_stop, | |
1142 | .show = syscall_list_show, | |
1143 | }; | |
1144 | ||
1145 | static | |
1146 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1147 | { | |
1148 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1149 | } | |
1150 | ||
1151 | const struct file_operations lttng_syscall_list_fops = { | |
1152 | .owner = THIS_MODULE, | |
1153 | .open = lttng_syscall_list_open, | |
1154 | .read = seq_read, | |
1155 | .llseek = seq_lseek, | |
1156 | .release = seq_release, | |
1157 | }; |