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> |
d4291869 | 31 | #include <linux/stringify.h> |
082d4946 MD |
32 | #include <linux/file.h> |
33 | #include <linux/anon_inodes.h> | |
259b6cb3 MD |
34 | #include <asm/ptrace.h> |
35 | #include <asm/syscall.h> | |
36 | ||
12e579db | 37 | #include "lib/bitfield.h" |
3a523f5b | 38 | #include "wrapper/tracepoint.h" |
4ac10b76 | 39 | #include "wrapper/file.h" |
49e2f4c4 | 40 | #include "wrapper/rcu.h" |
a90917c3 | 41 | #include "lttng-events.h" |
259b6cb3 | 42 | |
6333ace3 | 43 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
44 | # ifndef is_compat_task |
45 | # define is_compat_task() (0) | |
46 | # endif | |
6333ace3 MD |
47 | #endif |
48 | ||
5b7ac358 MD |
49 | enum sc_type { |
50 | SC_TYPE_ENTRY, | |
51 | SC_TYPE_EXIT, | |
52 | SC_TYPE_COMPAT_ENTRY, | |
53 | SC_TYPE_COMPAT_EXIT, | |
54 | }; | |
55 | ||
d4291869 MD |
56 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
57 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
58 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
59 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
60 | ||
61 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
62 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
63 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
64 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 65 | |
a93244f8 | 66 | static |
2faf7d1b | 67 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
68 | static |
69 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 70 | |
3a523f5b MD |
71 | /* |
72 | * Forward declarations for old kernels. | |
73 | */ | |
74 | struct mmsghdr; | |
75 | struct rlimit64; | |
76 | struct oldold_utsname; | |
77 | struct old_utsname; | |
78 | struct sel_arg_struct; | |
79 | struct mmap_arg_struct; | |
80 | ||
80f87dd2 MD |
81 | #ifdef IA32_NR_syscalls |
82 | #define NR_compat_syscalls IA32_NR_syscalls | |
83 | #else | |
84 | #define NR_compat_syscalls NR_syscalls | |
85 | #endif | |
86 | ||
259b6cb3 MD |
87 | /* |
88 | * Create LTTng tracepoint probes. | |
89 | */ | |
90 | #define LTTNG_PACKAGE_BUILD | |
91 | #define CREATE_TRACE_POINTS | |
2655f9ad | 92 | #define TP_MODULE_NOINIT |
2f804c0a | 93 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 94 | |
a93244f8 MD |
95 | #define PARAMS(args...) args |
96 | ||
5b7ac358 | 97 | /* Handle unknown syscalls */ |
72a52753 | 98 | #undef TRACE_SYSTEM |
5b7ac358 MD |
99 | #define TRACE_SYSTEM syscalls_unknown |
100 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
101 | #undef TRACE_SYSTEM | |
102 | ||
fc4f7161 MD |
103 | #define SC_ENTER |
104 | ||
fc4f7161 MD |
105 | #undef sc_exit |
106 | #define sc_exit(...) | |
b75d00c4 MD |
107 | #undef sc_in |
108 | #define sc_in(...) __VA_ARGS__ | |
109 | #undef sc_out | |
110 | #define sc_out(...) | |
111 | #undef sc_inout | |
112 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
113 | |
114 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 115 | #undef TP_PROBE_CB |
259b6cb3 | 116 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 117 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 118 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 MD |
119 | PARAMS(_fields)) |
120 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _fields) \ | |
d4291869 | 121 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 122 | PARAMS(_locvar), PARAMS(_code), \ |
57ede728 MD |
123 | PARAMS(_fields)) |
124 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ | |
125 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 126 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 127 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
a93244f8 | 128 | #undef TRACE_SYSTEM |
d4291869 | 129 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 130 | #define TRACE_INCLUDE_FILE syscalls_integers |
177b3692 | 131 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 132 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 133 | #undef TRACE_SYSTEM |
d4291869 | 134 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 135 | #define TRACE_INCLUDE_FILE syscalls_pointers |
177b3692 | 136 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 137 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 138 | #undef TRACE_SYSTEM |
cb3ef14c MD |
139 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
140 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
141 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
142 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 143 | #undef TP_PROBE_CB |
3bc29f0a MD |
144 | #undef _TRACE_SYSCALLS_INTEGERS_H |
145 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
146 | |
147 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 148 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 149 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 150 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 MD |
151 | PARAMS(_fields)) |
152 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _fields) \ | |
d4291869 | 153 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 MD |
154 | PARAMS(_locvar), PARAMS(_code), PARAMS(_fields)) |
155 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ | |
156 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 157 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
158 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
159 | compat_syscall_entry_##_name) | |
160 | #define TRACE_SYSTEM compat_syscall_entry_integers | |
5b7ac358 MD |
161 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
162 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
163 | #undef TRACE_INCLUDE_FILE | |
164 | #undef TRACE_SYSTEM | |
d4291869 | 165 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 MD |
166 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
167 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
168 | #undef TRACE_INCLUDE_FILE | |
169 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
170 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
171 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
172 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
173 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 174 | #undef TP_PROBE_CB |
3bc29f0a MD |
175 | #undef _TRACE_SYSCALLS_INTEGERS_H |
176 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 177 | |
fc4f7161 MD |
178 | #undef SC_ENTER |
179 | ||
180 | #define SC_EXIT | |
181 | ||
fc4f7161 MD |
182 | #undef sc_exit |
183 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
184 | #undef sc_in |
185 | #define sc_in(...) | |
186 | #undef sc_out | |
187 | #define sc_out(...) __VA_ARGS__ | |
188 | #undef sc_inout | |
189 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
190 | |
191 | /* Hijack probe callback for system call exit */ | |
192 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 193 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 194 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 MD |
195 | PARAMS(_fields)) |
196 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _fields) \ | |
3bc29f0a | 197 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 MD |
198 | PARAMS(_locvar), PARAMS(_code), PARAMS(_fields)) |
199 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ | |
200 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
201 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
202 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 MD |
203 | syscall_exit_##_name) |
204 | #define TRACE_SYSTEM syscall_exit_integers | |
205 | #define TRACE_INCLUDE_FILE syscalls_integers | |
206 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
207 | #undef TRACE_INCLUDE_FILE | |
208 | #undef TRACE_SYSTEM | |
209 | #define TRACE_SYSTEM syscall_exit_pointers | |
210 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
211 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
212 | #undef TRACE_INCLUDE_FILE | |
213 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
214 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
215 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
216 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
217 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 218 | #undef TP_PROBE_CB |
3bc29f0a MD |
219 | #undef _TRACE_SYSCALLS_INTEGERS_H |
220 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
221 | |
222 | ||
223 | /* Hijack probe callback for compat system call exit */ | |
224 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 225 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 226 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 MD |
227 | PARAMS(_fields)) |
228 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _fields) \ | |
3bc29f0a | 229 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 MD |
230 | PARAMS(_locvar), PARAMS(_code), PARAMS(_fields)) |
231 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ | |
232 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 233 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 234 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 MD |
235 | compat_syscall_exit_##_name) |
236 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
237 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 238 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 239 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 240 | #undef TRACE_SYSTEM |
5b7ac358 MD |
241 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
242 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 243 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 244 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 245 | #undef TRACE_SYSTEM |
cb3ef14c MD |
246 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
247 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
248 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
249 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 250 | #undef TP_PROBE_CB |
3bc29f0a MD |
251 | #undef _TRACE_SYSCALLS_INTEGERS_H |
252 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 253 | |
fc4f7161 | 254 | #undef SC_EXIT |
259b6cb3 | 255 | |
2655f9ad | 256 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
257 | #undef LTTNG_PACKAGE_BUILD |
258 | #undef CREATE_TRACE_POINTS | |
259 | ||
a93244f8 MD |
260 | struct trace_syscall_entry { |
261 | void *func; | |
262 | const struct lttng_event_desc *desc; | |
263 | const struct lttng_event_field *fields; | |
264 | unsigned int nrargs; | |
265 | }; | |
266 | ||
267 | #define CREATE_SYSCALL_TABLE | |
268 | ||
fc4f7161 MD |
269 | #define SC_ENTER |
270 | ||
271 | #undef sc_exit | |
272 | #define sc_exit(...) | |
273 | ||
259b6cb3 | 274 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 275 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 276 | [ _nr ] = { \ |
d4291869 | 277 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 278 | .nrargs = (_nrargs), \ |
d4291869 MD |
279 | .fields = __event_fields___syscall_entry_##_template, \ |
280 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
281 | }, |
282 | ||
5b7ac358 | 283 | /* Syscall enter tracing table */ |
49c50022 | 284 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
285 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
286 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
287 | }; |
288 | ||
a93244f8 MD |
289 | #undef TRACE_SYSCALL_TABLE |
290 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
291 | [ _nr ] = { \ | |
d4291869 | 292 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 293 | .nrargs = (_nrargs), \ |
d4291869 MD |
294 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
295 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
296 | }, |
297 | ||
5b7ac358 | 298 | /* Compat syscall enter table */ |
a93244f8 MD |
299 | const struct trace_syscall_entry compat_sc_table[] = { |
300 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
301 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
302 | }; | |
259b6cb3 | 303 | |
fc4f7161 MD |
304 | #undef SC_ENTER |
305 | ||
306 | #define SC_EXIT | |
307 | ||
308 | #undef sc_exit | |
309 | #define sc_exit(...) __VA_ARGS__ | |
310 | ||
5b7ac358 MD |
311 | #undef TRACE_SYSCALL_TABLE |
312 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
313 | [ _nr ] = { \ | |
314 | .func = __event_probe__syscall_exit_##_template, \ | |
315 | .nrargs = (_nrargs), \ | |
316 | .fields = __event_fields___syscall_exit_##_template, \ | |
317 | .desc = &__event_desc___syscall_exit_##_name, \ | |
318 | }, | |
319 | ||
320 | /* Syscall exit table */ | |
321 | static const struct trace_syscall_entry sc_exit_table[] = { | |
322 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
323 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
324 | }; | |
325 | ||
326 | #undef TRACE_SYSCALL_TABLE | |
327 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
328 | [ _nr ] = { \ | |
329 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
330 | .nrargs = (_nrargs), \ | |
331 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
332 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
333 | }, | |
334 | ||
335 | /* Compat syscall exit table */ | |
336 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
337 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
338 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
339 | }; | |
340 | ||
fc4f7161 MD |
341 | #undef SC_EXIT |
342 | ||
a93244f8 | 343 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 344 | |
80f87dd2 MD |
345 | struct lttng_syscall_filter { |
346 | DECLARE_BITMAP(sc, NR_syscalls); | |
347 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
348 | }; | |
349 | ||
a90917c3 | 350 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
351 | struct pt_regs *regs, unsigned int id) |
352 | { | |
353 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 354 | |
f405cfce | 355 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 356 | if (unlikely(is_compat_task())) |
d4291869 | 357 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 358 | else |
d4291869 | 359 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
360 | } |
361 | ||
2faf7d1b | 362 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 363 | { |
a90917c3 MD |
364 | struct lttng_channel *chan = __data; |
365 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
366 | const struct trace_syscall_entry *table, *entry; |
367 | size_t table_len; | |
259b6cb3 | 368 | |
b76dc1a0 | 369 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
370 | struct lttng_syscall_filter *filter; |
371 | ||
49e2f4c4 | 372 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 373 | if (filter) { |
74f7b56a | 374 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
375 | || !test_bit(id, filter->sc_compat)) { |
376 | /* System call filtered out. */ | |
377 | return; | |
378 | } | |
379 | } | |
49c50022 | 380 | table = compat_sc_table; |
a93244f8 | 381 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
382 | unknown_event = chan->sc_compat_unknown; |
383 | } else { | |
80f87dd2 MD |
384 | struct lttng_syscall_filter *filter; |
385 | ||
49e2f4c4 | 386 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 387 | if (filter) { |
74f7b56a | 388 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
389 | || !test_bit(id, filter->sc)) { |
390 | /* System call filtered out. */ | |
391 | return; | |
392 | } | |
393 | } | |
49c50022 MD |
394 | table = sc_table; |
395 | table_len = ARRAY_SIZE(sc_table); | |
396 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 397 | } |
74f7b56a | 398 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 399 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 400 | return; |
f405cfce | 401 | } |
49c50022 MD |
402 | if (unlikely(is_compat_task())) |
403 | event = chan->compat_sc_table[id]; | |
404 | else | |
405 | event = chan->sc_table[id]; | |
f405cfce | 406 | if (unlikely(!event)) { |
49c50022 | 407 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
408 | return; |
409 | } | |
49c50022 | 410 | entry = &table[id]; |
f405cfce | 411 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
412 | |
413 | switch (entry->nrargs) { | |
414 | case 0: | |
415 | { | |
416 | void (*fptr)(void *__data) = entry->func; | |
417 | ||
418 | fptr(event); | |
419 | break; | |
420 | } | |
421 | case 1: | |
422 | { | |
423 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
424 | unsigned long args[1]; | |
425 | ||
426 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
427 | fptr(event, args[0]); | |
428 | break; | |
429 | } | |
430 | case 2: | |
431 | { | |
432 | void (*fptr)(void *__data, | |
433 | unsigned long arg0, | |
434 | unsigned long arg1) = entry->func; | |
435 | unsigned long args[2]; | |
436 | ||
437 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
438 | fptr(event, args[0], args[1]); | |
439 | break; | |
440 | } | |
441 | case 3: | |
442 | { | |
443 | void (*fptr)(void *__data, | |
444 | unsigned long arg0, | |
445 | unsigned long arg1, | |
446 | unsigned long arg2) = entry->func; | |
447 | unsigned long args[3]; | |
448 | ||
449 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
450 | fptr(event, args[0], args[1], args[2]); | |
451 | break; | |
452 | } | |
453 | case 4: | |
454 | { | |
455 | void (*fptr)(void *__data, | |
456 | unsigned long arg0, | |
457 | unsigned long arg1, | |
458 | unsigned long arg2, | |
459 | unsigned long arg3) = entry->func; | |
460 | unsigned long args[4]; | |
461 | ||
462 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
463 | fptr(event, args[0], args[1], args[2], args[3]); | |
464 | break; | |
465 | } | |
466 | case 5: | |
467 | { | |
468 | void (*fptr)(void *__data, | |
469 | unsigned long arg0, | |
470 | unsigned long arg1, | |
471 | unsigned long arg2, | |
472 | unsigned long arg3, | |
473 | unsigned long arg4) = entry->func; | |
474 | unsigned long args[5]; | |
475 | ||
476 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
477 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
478 | break; | |
479 | } | |
480 | case 6: | |
481 | { | |
482 | void (*fptr)(void *__data, | |
483 | unsigned long arg0, | |
484 | unsigned long arg1, | |
485 | unsigned long arg2, | |
486 | unsigned long arg3, | |
487 | unsigned long arg4, | |
488 | unsigned long arg5) = entry->func; | |
489 | unsigned long args[6]; | |
490 | ||
491 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
492 | fptr(event, args[0], args[1], args[2], | |
493 | args[3], args[4], args[5]); | |
494 | break; | |
495 | } | |
496 | default: | |
497 | break; | |
498 | } | |
499 | } | |
500 | ||
5b7ac358 | 501 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 502 | struct pt_regs *regs, int id, long ret) |
5b7ac358 MD |
503 | { |
504 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
505 | ||
506 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
507 | if (unlikely(is_compat_task())) | |
508 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
509 | args); | |
510 | else | |
511 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
512 | } | |
513 | ||
514 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
515 | { | |
516 | struct lttng_channel *chan = __data; | |
517 | struct lttng_event *event, *unknown_event; | |
518 | const struct trace_syscall_entry *table, *entry; | |
519 | size_t table_len; | |
520 | long id; | |
521 | ||
522 | id = syscall_get_nr(current, regs); | |
523 | if (unlikely(is_compat_task())) { | |
524 | struct lttng_syscall_filter *filter; | |
525 | ||
49e2f4c4 | 526 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 527 | if (filter) { |
74f7b56a | 528 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
529 | || !test_bit(id, filter->sc_compat)) { |
530 | /* System call filtered out. */ | |
531 | return; | |
532 | } | |
533 | } | |
534 | table = compat_sc_exit_table; | |
535 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
536 | unknown_event = chan->compat_sc_exit_unknown; | |
537 | } else { | |
538 | struct lttng_syscall_filter *filter; | |
539 | ||
49e2f4c4 | 540 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 541 | if (filter) { |
74f7b56a | 542 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
543 | || !test_bit(id, filter->sc)) { |
544 | /* System call filtered out. */ | |
545 | return; | |
546 | } | |
547 | } | |
548 | table = sc_exit_table; | |
549 | table_len = ARRAY_SIZE(sc_exit_table); | |
550 | unknown_event = chan->sc_exit_unknown; | |
551 | } | |
74f7b56a | 552 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
553 | syscall_exit_unknown(unknown_event, regs, id, ret); |
554 | return; | |
555 | } | |
556 | if (unlikely(is_compat_task())) | |
557 | event = chan->compat_sc_exit_table[id]; | |
558 | else | |
559 | event = chan->sc_exit_table[id]; | |
560 | if (unlikely(!event)) { | |
561 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
562 | return; | |
563 | } | |
564 | entry = &table[id]; | |
565 | WARN_ON_ONCE(!entry); | |
566 | ||
567 | switch (entry->nrargs) { | |
568 | case 0: | |
569 | { | |
fc4f7161 | 570 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 571 | |
fc4f7161 | 572 | fptr(event, ret); |
5b7ac358 MD |
573 | break; |
574 | } | |
575 | case 1: | |
576 | { | |
577 | void (*fptr)(void *__data, | |
fc4f7161 | 578 | long ret, |
5b7ac358 MD |
579 | unsigned long arg0) = entry->func; |
580 | unsigned long args[1]; | |
581 | ||
582 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 583 | fptr(event, ret, args[0]); |
5b7ac358 MD |
584 | break; |
585 | } | |
586 | case 2: | |
587 | { | |
588 | void (*fptr)(void *__data, | |
fc4f7161 | 589 | long ret, |
5b7ac358 MD |
590 | unsigned long arg0, |
591 | unsigned long arg1) = entry->func; | |
592 | unsigned long args[2]; | |
593 | ||
594 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 595 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
596 | break; |
597 | } | |
598 | case 3: | |
599 | { | |
600 | void (*fptr)(void *__data, | |
fc4f7161 | 601 | long ret, |
5b7ac358 MD |
602 | unsigned long arg0, |
603 | unsigned long arg1, | |
604 | unsigned long arg2) = entry->func; | |
605 | unsigned long args[3]; | |
606 | ||
607 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 608 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
609 | break; |
610 | } | |
611 | case 4: | |
612 | { | |
613 | void (*fptr)(void *__data, | |
fc4f7161 | 614 | long ret, |
5b7ac358 MD |
615 | unsigned long arg0, |
616 | unsigned long arg1, | |
617 | unsigned long arg2, | |
618 | unsigned long arg3) = entry->func; | |
619 | unsigned long args[4]; | |
620 | ||
621 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 622 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
623 | break; |
624 | } | |
625 | case 5: | |
626 | { | |
627 | void (*fptr)(void *__data, | |
fc4f7161 | 628 | long ret, |
5b7ac358 MD |
629 | unsigned long arg0, |
630 | unsigned long arg1, | |
631 | unsigned long arg2, | |
632 | unsigned long arg3, | |
633 | unsigned long arg4) = entry->func; | |
634 | unsigned long args[5]; | |
635 | ||
636 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 637 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
638 | break; |
639 | } | |
640 | case 6: | |
641 | { | |
642 | void (*fptr)(void *__data, | |
fc4f7161 | 643 | long ret, |
5b7ac358 MD |
644 | unsigned long arg0, |
645 | unsigned long arg1, | |
646 | unsigned long arg2, | |
647 | unsigned long arg3, | |
648 | unsigned long arg4, | |
649 | unsigned long arg5) = entry->func; | |
650 | unsigned long args[6]; | |
651 | ||
652 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 653 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
654 | args[3], args[4], args[5]); |
655 | break; | |
656 | } | |
657 | default: | |
658 | break; | |
659 | } | |
660 | } | |
661 | ||
33a39a3c MD |
662 | /* |
663 | * noinline to diminish caller stack size. | |
664 | * Should be called with sessions lock held. | |
665 | */ | |
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'; |
33a39a3c MD |
714 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
715 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 716 | desc, ev.instrumentation); |
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 | ||
33a39a3c MD |
731 | /* |
732 | * Should be called with sessions lock held. | |
733 | */ | |
a90917c3 | 734 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 735 | { |
2a0c4816 | 736 | struct lttng_kernel_event ev; |
259b6cb3 MD |
737 | int ret; |
738 | ||
739 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
740 | |
741 | if (!chan->sc_table) { | |
742 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 743 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
744 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
745 | if (!chan->sc_table) | |
746 | return -ENOMEM; | |
747 | } | |
5b7ac358 MD |
748 | if (!chan->sc_exit_table) { |
749 | /* create syscall table mapping syscall to events */ | |
750 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
751 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
752 | if (!chan->sc_exit_table) | |
753 | return -ENOMEM; | |
754 | } | |
755 | ||
259b6cb3 | 756 | |
49c50022 MD |
757 | #ifdef CONFIG_COMPAT |
758 | if (!chan->compat_sc_table) { | |
759 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 760 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 761 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
762 | if (!chan->compat_sc_table) |
763 | return -ENOMEM; | |
764 | } | |
5b7ac358 MD |
765 | |
766 | if (!chan->compat_sc_exit_table) { | |
767 | /* create syscall table mapping compat syscall to events */ | |
768 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
769 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
770 | if (!chan->compat_sc_exit_table) | |
771 | return -ENOMEM; | |
772 | } | |
49c50022 | 773 | #endif |
f405cfce | 774 | if (!chan->sc_unknown) { |
f405cfce | 775 | const struct lttng_event_desc *desc = |
d4291869 | 776 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 777 | |
f405cfce | 778 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
779 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
780 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
781 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
782 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
783 | desc, |
784 | ev.instrumentation); | |
abc0446a MD |
785 | WARN_ON_ONCE(!chan->sc_unknown); |
786 | if (IS_ERR(chan->sc_unknown)) { | |
787 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
788 | } |
789 | } | |
790 | ||
b76dc1a0 | 791 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 792 | const struct lttng_event_desc *desc = |
d4291869 | 793 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
794 | |
795 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
796 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
797 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
798 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
799 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
800 | desc, |
801 | ev.instrumentation); | |
abc0446a MD |
802 | WARN_ON_ONCE(!chan->sc_unknown); |
803 | if (IS_ERR(chan->sc_compat_unknown)) { | |
804 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
805 | } |
806 | } | |
807 | ||
5b7ac358 | 808 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 809 | const struct lttng_event_desc *desc = |
5b7ac358 | 810 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
811 | |
812 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
813 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
814 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
815 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
816 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, | |
3c997079 MD |
817 | filter, desc, |
818 | ev.instrumentation); | |
5b7ac358 MD |
819 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
820 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
821 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
822 | } | |
823 | } | |
824 | ||
825 | if (!chan->sc_exit_unknown) { | |
826 | const struct lttng_event_desc *desc = | |
827 | &__event_desc___syscall_exit_unknown; | |
828 | ||
829 | memset(&ev, 0, sizeof(ev)); | |
830 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
831 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
832 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
833 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 834 | desc, ev.instrumentation); |
5b7ac358 MD |
835 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
836 | if (IS_ERR(chan->sc_exit_unknown)) { | |
837 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
838 | } |
839 | } | |
840 | ||
49c50022 | 841 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
842 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
843 | if (ret) | |
844 | return ret; | |
845 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
846 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
847 | if (ret) |
848 | return ret; | |
5b7ac358 | 849 | |
49c50022 | 850 | #ifdef CONFIG_COMPAT |
a93244f8 | 851 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
852 | chan->compat_sc_table, chan, filter, |
853 | SC_TYPE_COMPAT_ENTRY); | |
854 | if (ret) | |
855 | return ret; | |
856 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
857 | chan->compat_sc_exit_table, chan, filter, | |
858 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
859 | if (ret) |
860 | return ret; | |
861 | #endif | |
80f87dd2 MD |
862 | if (!chan->sys_enter_registered) { |
863 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
864 | (void *) syscall_entry_probe, chan); | |
865 | if (ret) | |
866 | return ret; | |
867 | chan->sys_enter_registered = 1; | |
868 | } | |
63728b02 MD |
869 | /* |
870 | * We change the name of sys_exit tracepoint due to namespace | |
871 | * conflict with sys_exit syscall entry. | |
872 | */ | |
80f87dd2 MD |
873 | if (!chan->sys_exit_registered) { |
874 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 875 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
876 | if (ret) { |
877 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
878 | (void *) syscall_entry_probe, chan)); | |
879 | return ret; | |
880 | } | |
881 | chan->sys_exit_registered = 1; | |
63728b02 | 882 | } |
259b6cb3 MD |
883 | return ret; |
884 | } | |
885 | ||
886 | /* | |
887 | * Only called at session destruction. | |
888 | */ | |
a90917c3 | 889 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
890 | { |
891 | int ret; | |
892 | ||
893 | if (!chan->sc_table) | |
894 | return 0; | |
80f87dd2 MD |
895 | if (chan->sys_enter_registered) { |
896 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 897 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
898 | if (ret) |
899 | return ret; | |
900 | chan->sys_enter_registered = 0; | |
901 | } | |
902 | if (chan->sys_exit_registered) { | |
903 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
904 | (void *) syscall_entry_probe, chan); | |
905 | if (ret) | |
906 | return ret; | |
907 | chan->sys_exit_registered = 0; | |
908 | } | |
a90917c3 | 909 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 910 | kfree(chan->sc_table); |
5b7ac358 | 911 | kfree(chan->sc_exit_table); |
49c50022 MD |
912 | #ifdef CONFIG_COMPAT |
913 | kfree(chan->compat_sc_table); | |
5b7ac358 | 914 | kfree(chan->compat_sc_exit_table); |
49c50022 | 915 | #endif |
80f87dd2 MD |
916 | kfree(chan->sc_filter); |
917 | return 0; | |
918 | } | |
919 | ||
920 | static | |
921 | int get_syscall_nr(const char *syscall_name) | |
922 | { | |
923 | int syscall_nr = -1; | |
924 | int i; | |
925 | ||
926 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
927 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 928 | const char *it_name; |
80f87dd2 MD |
929 | |
930 | entry = &sc_table[i]; | |
931 | if (!entry->desc) | |
932 | continue; | |
5b7ac358 MD |
933 | it_name = entry->desc->name; |
934 | it_name += strlen(SYSCALL_ENTRY_STR); | |
935 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
936 | syscall_nr = i; |
937 | break; | |
938 | } | |
939 | } | |
940 | return syscall_nr; | |
941 | } | |
942 | ||
943 | static | |
944 | int get_compat_syscall_nr(const char *syscall_name) | |
945 | { | |
946 | int syscall_nr = -1; | |
947 | int i; | |
948 | ||
949 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
950 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 951 | const char *it_name; |
80f87dd2 MD |
952 | |
953 | entry = &compat_sc_table[i]; | |
954 | if (!entry->desc) | |
955 | continue; | |
5b7ac358 MD |
956 | it_name = entry->desc->name; |
957 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
958 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
959 | syscall_nr = i; |
960 | break; | |
961 | } | |
962 | } | |
963 | return syscall_nr; | |
964 | } | |
965 | ||
12e579db MD |
966 | static |
967 | uint32_t get_sc_tables_len(void) | |
968 | { | |
969 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
970 | } | |
971 | ||
80f87dd2 MD |
972 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
973 | const char *name) | |
974 | { | |
975 | int syscall_nr, compat_syscall_nr, ret; | |
976 | struct lttng_syscall_filter *filter; | |
977 | ||
978 | WARN_ON_ONCE(!chan->sc_table); | |
979 | ||
980 | if (!name) { | |
981 | /* Enable all system calls by removing filter */ | |
982 | if (chan->sc_filter) { | |
983 | filter = chan->sc_filter; | |
984 | rcu_assign_pointer(chan->sc_filter, NULL); | |
985 | synchronize_trace(); | |
986 | kfree(filter); | |
987 | } | |
988 | chan->syscall_all = 1; | |
989 | return 0; | |
990 | } | |
991 | ||
992 | if (!chan->sc_filter) { | |
993 | if (chan->syscall_all) { | |
994 | /* | |
995 | * All syscalls are already enabled. | |
996 | */ | |
997 | return -EEXIST; | |
998 | } | |
999 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1000 | GFP_KERNEL); | |
1001 | if (!filter) | |
1002 | return -ENOMEM; | |
1003 | } else { | |
1004 | filter = chan->sc_filter; | |
1005 | } | |
1006 | syscall_nr = get_syscall_nr(name); | |
1007 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1008 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1009 | ret = -ENOENT; | |
1010 | goto error; | |
1011 | } | |
1012 | if (syscall_nr >= 0) { | |
1013 | if (test_bit(syscall_nr, filter->sc)) { | |
1014 | ret = -EEXIST; | |
1015 | goto error; | |
1016 | } | |
1017 | bitmap_set(filter->sc, syscall_nr, 1); | |
1018 | } | |
1019 | if (compat_syscall_nr >= 0) { | |
1020 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1021 | ret = -EEXIST; | |
1022 | goto error; | |
1023 | } | |
1024 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1025 | } | |
1026 | if (!chan->sc_filter) | |
1027 | rcu_assign_pointer(chan->sc_filter, filter); | |
1028 | return 0; | |
1029 | ||
1030 | error: | |
1031 | if (!chan->sc_filter) | |
1032 | kfree(filter); | |
1033 | return ret; | |
1034 | } | |
1035 | ||
1036 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1037 | const char *name) | |
1038 | { | |
1039 | int syscall_nr, compat_syscall_nr, ret; | |
1040 | struct lttng_syscall_filter *filter; | |
1041 | ||
1042 | WARN_ON_ONCE(!chan->sc_table); | |
1043 | ||
1044 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1045 | if (!chan->syscall_all) |
1046 | return -EEXIST; | |
80f87dd2 MD |
1047 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1048 | GFP_KERNEL); | |
1049 | if (!filter) | |
1050 | return -ENOMEM; | |
1051 | /* Trace all system calls, then apply disable. */ | |
1052 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1053 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1054 | } else { | |
1055 | filter = chan->sc_filter; | |
1056 | } | |
1057 | ||
72814741 | 1058 | if (!name) { |
404e87bf MD |
1059 | /* Fail if all syscalls are already disabled. */ |
1060 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1061 | && bitmap_empty(filter->sc_compat, | |
1062 | NR_compat_syscalls)) { | |
1063 | ret = -EEXIST; | |
1064 | goto error; | |
1065 | } | |
1066 | ||
72814741 MD |
1067 | /* Disable all system calls */ |
1068 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1069 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1070 | goto apply_filter; | |
1071 | } | |
80f87dd2 MD |
1072 | syscall_nr = get_syscall_nr(name); |
1073 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1074 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1075 | ret = -ENOENT; | |
1076 | goto error; | |
1077 | } | |
1078 | if (syscall_nr >= 0) { | |
cecef7f8 | 1079 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1080 | ret = -EEXIST; |
1081 | goto error; | |
1082 | } | |
cecef7f8 | 1083 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1084 | } |
1085 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1086 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1087 | ret = -EEXIST; |
1088 | goto error; | |
1089 | } | |
cecef7f8 | 1090 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1091 | } |
72814741 | 1092 | apply_filter: |
80f87dd2 MD |
1093 | if (!chan->sc_filter) |
1094 | rcu_assign_pointer(chan->sc_filter, filter); | |
1095 | chan->syscall_all = 0; | |
259b6cb3 | 1096 | return 0; |
80f87dd2 MD |
1097 | |
1098 | error: | |
1099 | if (!chan->sc_filter) | |
1100 | kfree(filter); | |
1101 | return ret; | |
259b6cb3 | 1102 | } |
2d2464bd MD |
1103 | |
1104 | static | |
1105 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1106 | { | |
1107 | const struct trace_syscall_entry *entry; | |
1108 | int iter = 0; | |
1109 | ||
1110 | for (entry = sc_table; | |
1111 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1112 | entry++) { | |
1113 | if (iter++ >= *pos) | |
1114 | return entry; | |
1115 | } | |
1116 | for (entry = compat_sc_table; | |
1117 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1118 | entry++) { | |
1119 | if (iter++ >= *pos) | |
1120 | return entry; | |
1121 | } | |
1122 | /* End of list */ | |
1123 | return NULL; | |
1124 | } | |
1125 | ||
1126 | static | |
1127 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1128 | { | |
1129 | return (void *) syscall_list_get_entry(pos); | |
1130 | } | |
1131 | ||
1132 | static | |
1133 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1134 | { | |
1135 | (*ppos)++; | |
1136 | return (void *) syscall_list_get_entry(ppos); | |
1137 | } | |
1138 | ||
1139 | static | |
1140 | void syscall_list_stop(struct seq_file *m, void *p) | |
1141 | { | |
1142 | } | |
1143 | ||
12e579db MD |
1144 | static |
1145 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1146 | const struct trace_syscall_entry **table, | |
1147 | unsigned int *bitness) | |
1148 | { | |
1149 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1150 | if (bitness) | |
1151 | *bitness = BITS_PER_LONG; | |
1152 | if (table) | |
1153 | *table = sc_table; | |
1154 | return 0; | |
1155 | } | |
1156 | if (!(entry >= compat_sc_table | |
1157 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1158 | return -EINVAL; | |
1159 | } | |
1160 | if (bitness) | |
1161 | *bitness = 32; | |
1162 | if (table) | |
1163 | *table = compat_sc_table; | |
1164 | return 0; | |
1165 | } | |
1166 | ||
2d2464bd MD |
1167 | static |
1168 | int syscall_list_show(struct seq_file *m, void *p) | |
1169 | { | |
1170 | const struct trace_syscall_entry *table, *entry = p; | |
1171 | unsigned int bitness; | |
d4291869 | 1172 | unsigned long index; |
12e579db | 1173 | int ret; |
d4291869 | 1174 | const char *name; |
2d2464bd | 1175 | |
12e579db MD |
1176 | ret = get_sc_table(entry, &table, &bitness); |
1177 | if (ret) | |
1178 | return ret; | |
f4855b46 MD |
1179 | if (!entry->desc) |
1180 | return 0; | |
d4291869 MD |
1181 | if (table == sc_table) { |
1182 | index = entry - table; | |
1183 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1184 | } else { | |
1185 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1186 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1187 | } | |
12e579db | 1188 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1189 | index, name, bitness); |
2d2464bd MD |
1190 | return 0; |
1191 | } | |
1192 | ||
1193 | static | |
1194 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1195 | .start = syscall_list_start, | |
1196 | .next = syscall_list_next, | |
1197 | .stop = syscall_list_stop, | |
1198 | .show = syscall_list_show, | |
1199 | }; | |
1200 | ||
1201 | static | |
1202 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1203 | { | |
1204 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1205 | } | |
1206 | ||
1207 | const struct file_operations lttng_syscall_list_fops = { | |
1208 | .owner = THIS_MODULE, | |
1209 | .open = lttng_syscall_list_open, | |
1210 | .read = seq_read, | |
1211 | .llseek = seq_lseek, | |
1212 | .release = seq_release, | |
1213 | }; | |
12e579db MD |
1214 | |
1215 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1216 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1217 | { | |
1218 | uint32_t len, sc_tables_len, bitmask_len; | |
1219 | int ret = 0, bit; | |
1220 | char *tmp_mask; | |
1221 | struct lttng_syscall_filter *filter; | |
1222 | ||
1223 | ret = get_user(len, &usyscall_mask->len); | |
1224 | if (ret) | |
1225 | return ret; | |
1226 | sc_tables_len = get_sc_tables_len(); | |
1227 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1228 | if (len < sc_tables_len) { | |
1229 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1230 | } | |
1231 | /* Array is large enough, we can copy array to user-space. */ | |
1232 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1233 | if (!tmp_mask) | |
1234 | return -ENOMEM; | |
1235 | filter = channel->sc_filter; | |
1236 | ||
1237 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
2f25059d MD |
1238 | bool state; |
1239 | ||
1240 | if (channel->sc_table) { | |
1241 | if (filter) | |
1242 | state = test_bit(bit, filter->sc); | |
1243 | else | |
1244 | state = 1; | |
1245 | } else { | |
1246 | state = 0; | |
1247 | } | |
1248 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1249 | } |
1250 | for (; bit < sc_tables_len; bit++) { | |
2f25059d MD |
1251 | bool state; |
1252 | ||
1253 | if (channel->compat_sc_table) { | |
1254 | if (filter) | |
1255 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1256 | filter->sc_compat); | |
1257 | else | |
1258 | state = 1; | |
1259 | } else { | |
1260 | state = 0; | |
1261 | } | |
1262 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1263 | } |
1264 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1265 | ret = -EFAULT; | |
1266 | kfree(tmp_mask); | |
1267 | return ret; | |
1268 | } | |
082d4946 MD |
1269 | |
1270 | int lttng_abi_syscall_list(void) | |
1271 | { | |
1272 | struct file *syscall_list_file; | |
1273 | int file_fd, ret; | |
1274 | ||
4ac10b76 | 1275 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1276 | if (file_fd < 0) { |
1277 | ret = file_fd; | |
1278 | goto fd_error; | |
1279 | } | |
1280 | ||
1281 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1282 | <tng_syscall_list_fops, | |
1283 | NULL, O_RDWR); | |
1284 | if (IS_ERR(syscall_list_file)) { | |
1285 | ret = PTR_ERR(syscall_list_file); | |
1286 | goto file_error; | |
1287 | } | |
1288 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1289 | if (ret < 0) | |
1290 | goto open_error; | |
1291 | fd_install(file_fd, syscall_list_file); | |
1292 | if (file_fd < 0) { | |
1293 | ret = file_fd; | |
1294 | goto fd_error; | |
1295 | } | |
1296 | return file_fd; | |
1297 | ||
1298 | open_error: | |
1299 | fput(syscall_list_file); | |
1300 | file_error: | |
1301 | put_unused_fd(file_fd); | |
1302 | fd_error: | |
1303 | return ret; | |
1304 | } |