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> |
7c92789f 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" |
a90917c3 | 39 | #include "lttng-events.h" |
259b6cb3 | 40 | |
6333ace3 | 41 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
42 | # ifndef is_compat_task |
43 | # define is_compat_task() (0) | |
44 | # endif | |
6333ace3 MD |
45 | #endif |
46 | ||
5b7ac358 MD |
47 | enum sc_type { |
48 | SC_TYPE_ENTRY, | |
49 | SC_TYPE_EXIT, | |
50 | SC_TYPE_COMPAT_ENTRY, | |
51 | SC_TYPE_COMPAT_EXIT, | |
52 | }; | |
53 | ||
d4291869 MD |
54 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
55 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
56 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
57 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
58 | ||
59 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
60 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
61 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
62 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 63 | |
a93244f8 | 64 | static |
2faf7d1b | 65 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
66 | static |
67 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 68 | |
3a523f5b MD |
69 | /* |
70 | * Forward declarations for old kernels. | |
71 | */ | |
72 | struct mmsghdr; | |
73 | struct rlimit64; | |
74 | struct oldold_utsname; | |
75 | struct old_utsname; | |
76 | struct sel_arg_struct; | |
77 | struct mmap_arg_struct; | |
78 | ||
80f87dd2 MD |
79 | #ifdef IA32_NR_syscalls |
80 | #define NR_compat_syscalls IA32_NR_syscalls | |
81 | #else | |
82 | #define NR_compat_syscalls NR_syscalls | |
83 | #endif | |
84 | ||
259b6cb3 MD |
85 | /* |
86 | * Create LTTng tracepoint probes. | |
87 | */ | |
88 | #define LTTNG_PACKAGE_BUILD | |
89 | #define CREATE_TRACE_POINTS | |
2655f9ad | 90 | #define TP_MODULE_NOINIT |
2f804c0a | 91 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 92 | |
a93244f8 MD |
93 | #define PARAMS(args...) args |
94 | ||
5b7ac358 | 95 | /* Handle unknown syscalls */ |
72a52753 | 96 | #undef TRACE_SYSTEM |
5b7ac358 MD |
97 | #define TRACE_SYSTEM syscalls_unknown |
98 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
99 | #undef TRACE_SYSTEM | |
100 | ||
fc4f7161 MD |
101 | #define SC_ENTER |
102 | ||
fc4f7161 MD |
103 | #undef sc_exit |
104 | #define sc_exit(...) | |
b75d00c4 MD |
105 | #undef sc_in |
106 | #define sc_in(...) __VA_ARGS__ | |
107 | #undef sc_out | |
108 | #define sc_out(...) | |
109 | #undef sc_inout | |
110 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
111 | |
112 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 113 | #undef TP_PROBE_CB |
259b6cb3 | 114 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 115 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
d4291869 | 116 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 | 117 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 118 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
d4291869 | 119 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 120 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 121 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 122 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
d4291869 | 123 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 124 | PARAMS(_printk)) |
cb3ef14c | 125 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 126 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
a93244f8 | 127 | #undef TRACE_SYSTEM |
d4291869 | 128 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 129 | #define TRACE_INCLUDE_FILE syscalls_integers |
177b3692 | 130 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 131 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 132 | #undef TRACE_SYSTEM |
d4291869 | 133 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 134 | #define TRACE_INCLUDE_FILE syscalls_pointers |
177b3692 | 135 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 136 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 137 | #undef TRACE_SYSTEM |
cb3ef14c MD |
138 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
139 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
140 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
141 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 142 | #undef TP_PROBE_CB |
3bc29f0a MD |
143 | #undef _TRACE_SYSCALLS_INTEGERS_H |
144 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
145 | |
146 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 147 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 148 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
d4291869 | 149 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 150 | PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 151 | PARAMS(_printk)) |
cb3ef14c | 152 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
d4291869 | 153 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 154 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 155 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 156 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
d4291869 | 157 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_struct), \ |
5b7ac358 | 158 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 159 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
160 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
161 | compat_syscall_entry_##_name) | |
162 | #define TRACE_SYSTEM compat_syscall_entry_integers | |
5b7ac358 MD |
163 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
164 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
165 | #undef TRACE_INCLUDE_FILE | |
166 | #undef TRACE_SYSTEM | |
d4291869 | 167 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 MD |
168 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
169 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
170 | #undef TRACE_INCLUDE_FILE | |
171 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
172 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
173 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
174 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
175 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 176 | #undef TP_PROBE_CB |
3bc29f0a MD |
177 | #undef _TRACE_SYSCALLS_INTEGERS_H |
178 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 179 | |
fc4f7161 MD |
180 | #undef SC_ENTER |
181 | ||
182 | #define SC_EXIT | |
183 | ||
fc4f7161 MD |
184 | #undef sc_exit |
185 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
186 | #undef sc_in |
187 | #define sc_in(...) | |
188 | #undef sc_out | |
189 | #define sc_out(...) __VA_ARGS__ | |
190 | #undef sc_inout | |
191 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
192 | |
193 | /* Hijack probe callback for system call exit */ | |
194 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 195 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 196 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 197 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 198 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 199 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 200 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 201 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 202 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 203 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \ |
5b7ac358 | 204 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c MD |
205 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
206 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 MD |
207 | syscall_exit_##_name) |
208 | #define TRACE_SYSTEM syscall_exit_integers | |
209 | #define TRACE_INCLUDE_FILE syscalls_integers | |
210 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
211 | #undef TRACE_INCLUDE_FILE | |
212 | #undef TRACE_SYSTEM | |
213 | #define TRACE_SYSTEM syscall_exit_pointers | |
214 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
215 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
216 | #undef TRACE_INCLUDE_FILE | |
217 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
218 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
219 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
220 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
221 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 222 | #undef TP_PROBE_CB |
3bc29f0a MD |
223 | #undef _TRACE_SYSCALLS_INTEGERS_H |
224 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
225 | |
226 | ||
227 | /* Hijack probe callback for compat system call exit */ | |
228 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 229 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 230 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 231 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 232 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 233 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 234 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 235 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 236 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 237 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \ |
a93244f8 | 238 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 239 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 240 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 MD |
241 | compat_syscall_exit_##_name) |
242 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
243 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 244 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 245 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 246 | #undef TRACE_SYSTEM |
5b7ac358 MD |
247 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
248 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 249 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 250 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 251 | #undef TRACE_SYSTEM |
cb3ef14c MD |
252 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
253 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
254 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
255 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 256 | #undef TP_PROBE_CB |
3bc29f0a MD |
257 | #undef _TRACE_SYSCALLS_INTEGERS_H |
258 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 259 | |
fc4f7161 | 260 | #undef SC_EXIT |
259b6cb3 | 261 | |
2655f9ad | 262 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
263 | #undef LTTNG_PACKAGE_BUILD |
264 | #undef CREATE_TRACE_POINTS | |
265 | ||
a93244f8 MD |
266 | struct trace_syscall_entry { |
267 | void *func; | |
268 | const struct lttng_event_desc *desc; | |
269 | const struct lttng_event_field *fields; | |
270 | unsigned int nrargs; | |
271 | }; | |
272 | ||
273 | #define CREATE_SYSCALL_TABLE | |
274 | ||
fc4f7161 MD |
275 | #define SC_ENTER |
276 | ||
277 | #undef sc_exit | |
278 | #define sc_exit(...) | |
279 | ||
259b6cb3 | 280 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 281 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 282 | [ _nr ] = { \ |
d4291869 | 283 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 284 | .nrargs = (_nrargs), \ |
d4291869 MD |
285 | .fields = __event_fields___syscall_entry_##_template, \ |
286 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
287 | }, |
288 | ||
5b7ac358 | 289 | /* Syscall enter tracing table */ |
49c50022 | 290 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
291 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
292 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
293 | }; |
294 | ||
a93244f8 MD |
295 | #undef TRACE_SYSCALL_TABLE |
296 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
297 | [ _nr ] = { \ | |
d4291869 | 298 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 299 | .nrargs = (_nrargs), \ |
d4291869 MD |
300 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
301 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
302 | }, |
303 | ||
5b7ac358 | 304 | /* Compat syscall enter table */ |
a93244f8 MD |
305 | const struct trace_syscall_entry compat_sc_table[] = { |
306 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
307 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
308 | }; | |
259b6cb3 | 309 | |
fc4f7161 MD |
310 | #undef SC_ENTER |
311 | ||
312 | #define SC_EXIT | |
313 | ||
314 | #undef sc_exit | |
315 | #define sc_exit(...) __VA_ARGS__ | |
316 | ||
5b7ac358 MD |
317 | #undef TRACE_SYSCALL_TABLE |
318 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
319 | [ _nr ] = { \ | |
320 | .func = __event_probe__syscall_exit_##_template, \ | |
321 | .nrargs = (_nrargs), \ | |
322 | .fields = __event_fields___syscall_exit_##_template, \ | |
323 | .desc = &__event_desc___syscall_exit_##_name, \ | |
324 | }, | |
325 | ||
326 | /* Syscall exit table */ | |
327 | static const struct trace_syscall_entry sc_exit_table[] = { | |
328 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
329 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
330 | }; | |
331 | ||
332 | #undef TRACE_SYSCALL_TABLE | |
333 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
334 | [ _nr ] = { \ | |
335 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
336 | .nrargs = (_nrargs), \ | |
337 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
338 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
339 | }, | |
340 | ||
341 | /* Compat syscall exit table */ | |
342 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
343 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
344 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
345 | }; | |
346 | ||
fc4f7161 MD |
347 | #undef SC_EXIT |
348 | ||
a93244f8 | 349 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 350 | |
80f87dd2 MD |
351 | struct lttng_syscall_filter { |
352 | DECLARE_BITMAP(sc, NR_syscalls); | |
353 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
354 | }; | |
355 | ||
a90917c3 | 356 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
357 | struct pt_regs *regs, unsigned int id) |
358 | { | |
359 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 360 | |
f405cfce | 361 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 362 | if (unlikely(is_compat_task())) |
d4291869 | 363 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 364 | else |
d4291869 | 365 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
366 | } |
367 | ||
2faf7d1b | 368 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 369 | { |
a90917c3 MD |
370 | struct lttng_channel *chan = __data; |
371 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
372 | const struct trace_syscall_entry *table, *entry; |
373 | size_t table_len; | |
259b6cb3 | 374 | |
b76dc1a0 | 375 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
376 | struct lttng_syscall_filter *filter; |
377 | ||
378 | filter = rcu_dereference(chan->sc_filter); | |
379 | if (filter) { | |
74f7b56a | 380 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
381 | || !test_bit(id, filter->sc_compat)) { |
382 | /* System call filtered out. */ | |
383 | return; | |
384 | } | |
385 | } | |
49c50022 | 386 | table = compat_sc_table; |
a93244f8 | 387 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
388 | unknown_event = chan->sc_compat_unknown; |
389 | } else { | |
80f87dd2 MD |
390 | struct lttng_syscall_filter *filter; |
391 | ||
392 | filter = rcu_dereference(chan->sc_filter); | |
393 | if (filter) { | |
74f7b56a | 394 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
395 | || !test_bit(id, filter->sc)) { |
396 | /* System call filtered out. */ | |
397 | return; | |
398 | } | |
399 | } | |
49c50022 MD |
400 | table = sc_table; |
401 | table_len = ARRAY_SIZE(sc_table); | |
402 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 403 | } |
74f7b56a | 404 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 405 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 406 | return; |
f405cfce | 407 | } |
49c50022 MD |
408 | if (unlikely(is_compat_task())) |
409 | event = chan->compat_sc_table[id]; | |
410 | else | |
411 | event = chan->sc_table[id]; | |
f405cfce | 412 | if (unlikely(!event)) { |
49c50022 | 413 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
414 | return; |
415 | } | |
49c50022 | 416 | entry = &table[id]; |
f405cfce | 417 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
418 | |
419 | switch (entry->nrargs) { | |
420 | case 0: | |
421 | { | |
422 | void (*fptr)(void *__data) = entry->func; | |
423 | ||
424 | fptr(event); | |
425 | break; | |
426 | } | |
427 | case 1: | |
428 | { | |
429 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
430 | unsigned long args[1]; | |
431 | ||
432 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
433 | fptr(event, args[0]); | |
434 | break; | |
435 | } | |
436 | case 2: | |
437 | { | |
438 | void (*fptr)(void *__data, | |
439 | unsigned long arg0, | |
440 | unsigned long arg1) = entry->func; | |
441 | unsigned long args[2]; | |
442 | ||
443 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
444 | fptr(event, args[0], args[1]); | |
445 | break; | |
446 | } | |
447 | case 3: | |
448 | { | |
449 | void (*fptr)(void *__data, | |
450 | unsigned long arg0, | |
451 | unsigned long arg1, | |
452 | unsigned long arg2) = entry->func; | |
453 | unsigned long args[3]; | |
454 | ||
455 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
456 | fptr(event, args[0], args[1], args[2]); | |
457 | break; | |
458 | } | |
459 | case 4: | |
460 | { | |
461 | void (*fptr)(void *__data, | |
462 | unsigned long arg0, | |
463 | unsigned long arg1, | |
464 | unsigned long arg2, | |
465 | unsigned long arg3) = entry->func; | |
466 | unsigned long args[4]; | |
467 | ||
468 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
469 | fptr(event, args[0], args[1], args[2], args[3]); | |
470 | break; | |
471 | } | |
472 | case 5: | |
473 | { | |
474 | void (*fptr)(void *__data, | |
475 | unsigned long arg0, | |
476 | unsigned long arg1, | |
477 | unsigned long arg2, | |
478 | unsigned long arg3, | |
479 | unsigned long arg4) = entry->func; | |
480 | unsigned long args[5]; | |
481 | ||
482 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
483 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
484 | break; | |
485 | } | |
486 | case 6: | |
487 | { | |
488 | void (*fptr)(void *__data, | |
489 | unsigned long arg0, | |
490 | unsigned long arg1, | |
491 | unsigned long arg2, | |
492 | unsigned long arg3, | |
493 | unsigned long arg4, | |
494 | unsigned long arg5) = entry->func; | |
495 | unsigned long args[6]; | |
496 | ||
497 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
498 | fptr(event, args[0], args[1], args[2], | |
499 | args[3], args[4], args[5]); | |
500 | break; | |
501 | } | |
502 | default: | |
503 | break; | |
504 | } | |
505 | } | |
506 | ||
5b7ac358 | 507 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 508 | struct pt_regs *regs, int id, long ret) |
5b7ac358 MD |
509 | { |
510 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
511 | ||
512 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
513 | if (unlikely(is_compat_task())) | |
514 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
515 | args); | |
516 | else | |
517 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
518 | } | |
519 | ||
520 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
521 | { | |
522 | struct lttng_channel *chan = __data; | |
523 | struct lttng_event *event, *unknown_event; | |
524 | const struct trace_syscall_entry *table, *entry; | |
525 | size_t table_len; | |
526 | long id; | |
527 | ||
528 | id = syscall_get_nr(current, regs); | |
529 | if (unlikely(is_compat_task())) { | |
530 | struct lttng_syscall_filter *filter; | |
531 | ||
532 | filter = rcu_dereference(chan->sc_filter); | |
533 | if (filter) { | |
74f7b56a | 534 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
535 | || !test_bit(id, filter->sc_compat)) { |
536 | /* System call filtered out. */ | |
537 | return; | |
538 | } | |
539 | } | |
540 | table = compat_sc_exit_table; | |
541 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
542 | unknown_event = chan->compat_sc_exit_unknown; | |
543 | } else { | |
544 | struct lttng_syscall_filter *filter; | |
545 | ||
546 | filter = rcu_dereference(chan->sc_filter); | |
547 | if (filter) { | |
74f7b56a | 548 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
549 | || !test_bit(id, filter->sc)) { |
550 | /* System call filtered out. */ | |
551 | return; | |
552 | } | |
553 | } | |
554 | table = sc_exit_table; | |
555 | table_len = ARRAY_SIZE(sc_exit_table); | |
556 | unknown_event = chan->sc_exit_unknown; | |
557 | } | |
74f7b56a | 558 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
559 | syscall_exit_unknown(unknown_event, regs, id, ret); |
560 | return; | |
561 | } | |
562 | if (unlikely(is_compat_task())) | |
563 | event = chan->compat_sc_exit_table[id]; | |
564 | else | |
565 | event = chan->sc_exit_table[id]; | |
566 | if (unlikely(!event)) { | |
567 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
568 | return; | |
569 | } | |
570 | entry = &table[id]; | |
571 | WARN_ON_ONCE(!entry); | |
572 | ||
573 | switch (entry->nrargs) { | |
574 | case 0: | |
575 | { | |
fc4f7161 | 576 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 577 | |
fc4f7161 | 578 | fptr(event, ret); |
5b7ac358 MD |
579 | break; |
580 | } | |
581 | case 1: | |
582 | { | |
583 | void (*fptr)(void *__data, | |
fc4f7161 | 584 | long ret, |
5b7ac358 MD |
585 | unsigned long arg0) = entry->func; |
586 | unsigned long args[1]; | |
587 | ||
588 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 589 | fptr(event, ret, args[0]); |
5b7ac358 MD |
590 | break; |
591 | } | |
592 | case 2: | |
593 | { | |
594 | void (*fptr)(void *__data, | |
fc4f7161 | 595 | long ret, |
5b7ac358 MD |
596 | unsigned long arg0, |
597 | unsigned long arg1) = entry->func; | |
598 | unsigned long args[2]; | |
599 | ||
600 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 601 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
602 | break; |
603 | } | |
604 | case 3: | |
605 | { | |
606 | void (*fptr)(void *__data, | |
fc4f7161 | 607 | long ret, |
5b7ac358 MD |
608 | unsigned long arg0, |
609 | unsigned long arg1, | |
610 | unsigned long arg2) = entry->func; | |
611 | unsigned long args[3]; | |
612 | ||
613 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 614 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
615 | break; |
616 | } | |
617 | case 4: | |
618 | { | |
619 | void (*fptr)(void *__data, | |
fc4f7161 | 620 | long ret, |
5b7ac358 MD |
621 | unsigned long arg0, |
622 | unsigned long arg1, | |
623 | unsigned long arg2, | |
624 | unsigned long arg3) = entry->func; | |
625 | unsigned long args[4]; | |
626 | ||
627 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 628 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
629 | break; |
630 | } | |
631 | case 5: | |
632 | { | |
633 | void (*fptr)(void *__data, | |
fc4f7161 | 634 | long ret, |
5b7ac358 MD |
635 | unsigned long arg0, |
636 | unsigned long arg1, | |
637 | unsigned long arg2, | |
638 | unsigned long arg3, | |
639 | unsigned long arg4) = entry->func; | |
640 | unsigned long args[5]; | |
641 | ||
642 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 643 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
644 | break; |
645 | } | |
646 | case 6: | |
647 | { | |
648 | void (*fptr)(void *__data, | |
fc4f7161 | 649 | long ret, |
5b7ac358 MD |
650 | unsigned long arg0, |
651 | unsigned long arg1, | |
652 | unsigned long arg2, | |
653 | unsigned long arg3, | |
654 | unsigned long arg4, | |
655 | unsigned long arg5) = entry->func; | |
656 | unsigned long args[6]; | |
657 | ||
658 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 659 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
660 | args[3], args[4], args[5]); |
661 | break; | |
662 | } | |
663 | default: | |
664 | break; | |
665 | } | |
666 | } | |
667 | ||
2a0c4816 | 668 | /* noinline to diminish caller stack size */ |
49c50022 MD |
669 | static |
670 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
671 | struct lttng_event **chan_table, struct lttng_channel *chan, |
672 | void *filter, enum sc_type type) | |
259b6cb3 | 673 | { |
2a0c4816 | 674 | const struct lttng_event_desc *desc; |
259b6cb3 | 675 | unsigned int i; |
49c50022 MD |
676 | |
677 | /* Allocate events for each syscall, insert into table */ | |
678 | for (i = 0; i < table_len; i++) { | |
679 | struct lttng_kernel_event ev; | |
2a0c4816 | 680 | desc = table[i].desc; |
49c50022 MD |
681 | |
682 | if (!desc) { | |
683 | /* Unknown syscall */ | |
684 | continue; | |
685 | } | |
686 | /* | |
687 | * Skip those already populated by previous failed | |
688 | * register for this channel. | |
689 | */ | |
690 | if (chan_table[i]) | |
691 | continue; | |
692 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
693 | switch (type) { |
694 | case SC_TYPE_ENTRY: | |
695 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
696 | LTTNG_KERNEL_SYM_NAME_LEN); | |
697 | break; | |
698 | case SC_TYPE_EXIT: | |
699 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
700 | LTTNG_KERNEL_SYM_NAME_LEN); | |
701 | break; | |
702 | case SC_TYPE_COMPAT_ENTRY: | |
703 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
704 | LTTNG_KERNEL_SYM_NAME_LEN); | |
705 | break; | |
706 | case SC_TYPE_COMPAT_EXIT: | |
707 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
708 | LTTNG_KERNEL_SYM_NAME_LEN); | |
709 | break; | |
710 | default: | |
711 | BUG_ON(1); | |
712 | break; | |
713 | } | |
714 | strncat(ev.name, desc->name, | |
715 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 716 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
49c50022 | 717 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 718 | chan_table[i] = lttng_event_create(chan, &ev, filter, |
49c50022 | 719 | desc); |
abc0446a MD |
720 | WARN_ON_ONCE(!chan_table[i]); |
721 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
722 | /* |
723 | * If something goes wrong in event registration | |
724 | * after the first one, we have no choice but to | |
725 | * leave the previous events in there, until | |
726 | * deleted by session teardown. | |
727 | */ | |
abc0446a | 728 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
729 | } |
730 | } | |
731 | return 0; | |
732 | } | |
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'; | |
f405cfce | 781 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 782 | chan->sc_unknown = lttng_event_create(chan, &ev, filter, |
f405cfce | 783 | desc); |
abc0446a MD |
784 | WARN_ON_ONCE(!chan->sc_unknown); |
785 | if (IS_ERR(chan->sc_unknown)) { | |
786 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
787 | } |
788 | } | |
789 | ||
b76dc1a0 | 790 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 791 | const struct lttng_event_desc *desc = |
d4291869 | 792 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
793 | |
794 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
795 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
796 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
b76dc1a0 | 797 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 798 | chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter, |
b76dc1a0 | 799 | desc); |
abc0446a MD |
800 | WARN_ON_ONCE(!chan->sc_unknown); |
801 | if (IS_ERR(chan->sc_compat_unknown)) { | |
802 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
803 | } |
804 | } | |
805 | ||
5b7ac358 | 806 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 807 | const struct lttng_event_desc *desc = |
5b7ac358 | 808 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
809 | |
810 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
811 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
812 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2f804c0a | 813 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
5b7ac358 MD |
814 | chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev, |
815 | filter, desc); | |
816 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); | |
817 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
818 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
819 | } | |
820 | } | |
821 | ||
822 | if (!chan->sc_exit_unknown) { | |
823 | const struct lttng_event_desc *desc = | |
824 | &__event_desc___syscall_exit_unknown; | |
825 | ||
826 | memset(&ev, 0, sizeof(ev)); | |
827 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
828 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
829 | ev.instrumentation = LTTNG_KERNEL_NOOP; | |
830 | chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter, | |
2f804c0a | 831 | desc); |
5b7ac358 MD |
832 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
833 | if (IS_ERR(chan->sc_exit_unknown)) { | |
834 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
835 | } |
836 | } | |
837 | ||
49c50022 | 838 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
839 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
840 | if (ret) | |
841 | return ret; | |
842 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
843 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
844 | if (ret) |
845 | return ret; | |
5b7ac358 | 846 | |
49c50022 | 847 | #ifdef CONFIG_COMPAT |
a93244f8 | 848 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
849 | chan->compat_sc_table, chan, filter, |
850 | SC_TYPE_COMPAT_ENTRY); | |
851 | if (ret) | |
852 | return ret; | |
853 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
854 | chan->compat_sc_exit_table, chan, filter, | |
855 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
856 | if (ret) |
857 | return ret; | |
858 | #endif | |
80f87dd2 MD |
859 | if (!chan->sys_enter_registered) { |
860 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
861 | (void *) syscall_entry_probe, chan); | |
862 | if (ret) | |
863 | return ret; | |
864 | chan->sys_enter_registered = 1; | |
865 | } | |
63728b02 MD |
866 | /* |
867 | * We change the name of sys_exit tracepoint due to namespace | |
868 | * conflict with sys_exit syscall entry. | |
869 | */ | |
80f87dd2 MD |
870 | if (!chan->sys_exit_registered) { |
871 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 872 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
873 | if (ret) { |
874 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
875 | (void *) syscall_entry_probe, chan)); | |
876 | return ret; | |
877 | } | |
878 | chan->sys_exit_registered = 1; | |
63728b02 | 879 | } |
259b6cb3 MD |
880 | return ret; |
881 | } | |
882 | ||
883 | /* | |
884 | * Only called at session destruction. | |
885 | */ | |
a90917c3 | 886 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
887 | { |
888 | int ret; | |
889 | ||
890 | if (!chan->sc_table) | |
891 | return 0; | |
80f87dd2 MD |
892 | if (chan->sys_enter_registered) { |
893 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 894 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
895 | if (ret) |
896 | return ret; | |
897 | chan->sys_enter_registered = 0; | |
898 | } | |
899 | if (chan->sys_exit_registered) { | |
900 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
901 | (void *) syscall_entry_probe, chan); | |
902 | if (ret) | |
903 | return ret; | |
904 | chan->sys_exit_registered = 0; | |
905 | } | |
a90917c3 | 906 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 907 | kfree(chan->sc_table); |
5b7ac358 | 908 | kfree(chan->sc_exit_table); |
49c50022 MD |
909 | #ifdef CONFIG_COMPAT |
910 | kfree(chan->compat_sc_table); | |
5b7ac358 | 911 | kfree(chan->compat_sc_exit_table); |
49c50022 | 912 | #endif |
80f87dd2 MD |
913 | kfree(chan->sc_filter); |
914 | return 0; | |
915 | } | |
916 | ||
917 | static | |
918 | int get_syscall_nr(const char *syscall_name) | |
919 | { | |
920 | int syscall_nr = -1; | |
921 | int i; | |
922 | ||
923 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
924 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 925 | const char *it_name; |
80f87dd2 MD |
926 | |
927 | entry = &sc_table[i]; | |
928 | if (!entry->desc) | |
929 | continue; | |
5b7ac358 MD |
930 | it_name = entry->desc->name; |
931 | it_name += strlen(SYSCALL_ENTRY_STR); | |
932 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
933 | syscall_nr = i; |
934 | break; | |
935 | } | |
936 | } | |
937 | return syscall_nr; | |
938 | } | |
939 | ||
940 | static | |
941 | int get_compat_syscall_nr(const char *syscall_name) | |
942 | { | |
943 | int syscall_nr = -1; | |
944 | int i; | |
945 | ||
946 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
947 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 948 | const char *it_name; |
80f87dd2 MD |
949 | |
950 | entry = &compat_sc_table[i]; | |
951 | if (!entry->desc) | |
952 | continue; | |
5b7ac358 MD |
953 | it_name = entry->desc->name; |
954 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
955 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
956 | syscall_nr = i; |
957 | break; | |
958 | } | |
959 | } | |
960 | return syscall_nr; | |
961 | } | |
962 | ||
12e579db MD |
963 | static |
964 | uint32_t get_sc_tables_len(void) | |
965 | { | |
966 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
967 | } | |
968 | ||
80f87dd2 MD |
969 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
970 | const char *name) | |
971 | { | |
972 | int syscall_nr, compat_syscall_nr, ret; | |
973 | struct lttng_syscall_filter *filter; | |
974 | ||
975 | WARN_ON_ONCE(!chan->sc_table); | |
976 | ||
977 | if (!name) { | |
978 | /* Enable all system calls by removing filter */ | |
979 | if (chan->sc_filter) { | |
980 | filter = chan->sc_filter; | |
981 | rcu_assign_pointer(chan->sc_filter, NULL); | |
982 | synchronize_trace(); | |
983 | kfree(filter); | |
984 | } | |
985 | chan->syscall_all = 1; | |
986 | return 0; | |
987 | } | |
988 | ||
989 | if (!chan->sc_filter) { | |
990 | if (chan->syscall_all) { | |
991 | /* | |
992 | * All syscalls are already enabled. | |
993 | */ | |
994 | return -EEXIST; | |
995 | } | |
996 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
997 | GFP_KERNEL); | |
998 | if (!filter) | |
999 | return -ENOMEM; | |
1000 | } else { | |
1001 | filter = chan->sc_filter; | |
1002 | } | |
1003 | syscall_nr = get_syscall_nr(name); | |
1004 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1005 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1006 | ret = -ENOENT; | |
1007 | goto error; | |
1008 | } | |
1009 | if (syscall_nr >= 0) { | |
1010 | if (test_bit(syscall_nr, filter->sc)) { | |
1011 | ret = -EEXIST; | |
1012 | goto error; | |
1013 | } | |
1014 | bitmap_set(filter->sc, syscall_nr, 1); | |
1015 | } | |
1016 | if (compat_syscall_nr >= 0) { | |
1017 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1018 | ret = -EEXIST; | |
1019 | goto error; | |
1020 | } | |
1021 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1022 | } | |
1023 | if (!chan->sc_filter) | |
1024 | rcu_assign_pointer(chan->sc_filter, filter); | |
1025 | return 0; | |
1026 | ||
1027 | error: | |
1028 | if (!chan->sc_filter) | |
1029 | kfree(filter); | |
1030 | return ret; | |
1031 | } | |
1032 | ||
1033 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1034 | const char *name) | |
1035 | { | |
1036 | int syscall_nr, compat_syscall_nr, ret; | |
1037 | struct lttng_syscall_filter *filter; | |
1038 | ||
1039 | WARN_ON_ONCE(!chan->sc_table); | |
1040 | ||
1041 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1042 | if (!chan->syscall_all) |
1043 | return -EEXIST; | |
80f87dd2 MD |
1044 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1045 | GFP_KERNEL); | |
1046 | if (!filter) | |
1047 | return -ENOMEM; | |
1048 | /* Trace all system calls, then apply disable. */ | |
1049 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1050 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1051 | } else { | |
1052 | filter = chan->sc_filter; | |
1053 | } | |
1054 | ||
72814741 | 1055 | if (!name) { |
404e87bf MD |
1056 | /* Fail if all syscalls are already disabled. */ |
1057 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1058 | && bitmap_empty(filter->sc_compat, | |
1059 | NR_compat_syscalls)) { | |
1060 | ret = -EEXIST; | |
1061 | goto error; | |
1062 | } | |
1063 | ||
72814741 MD |
1064 | /* Disable all system calls */ |
1065 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1066 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1067 | goto apply_filter; | |
1068 | } | |
80f87dd2 MD |
1069 | syscall_nr = get_syscall_nr(name); |
1070 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1071 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1072 | ret = -ENOENT; | |
1073 | goto error; | |
1074 | } | |
1075 | if (syscall_nr >= 0) { | |
cecef7f8 | 1076 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1077 | ret = -EEXIST; |
1078 | goto error; | |
1079 | } | |
cecef7f8 | 1080 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1081 | } |
1082 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1083 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1084 | ret = -EEXIST; |
1085 | goto error; | |
1086 | } | |
cecef7f8 | 1087 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1088 | } |
72814741 | 1089 | apply_filter: |
80f87dd2 MD |
1090 | if (!chan->sc_filter) |
1091 | rcu_assign_pointer(chan->sc_filter, filter); | |
1092 | chan->syscall_all = 0; | |
259b6cb3 | 1093 | return 0; |
80f87dd2 MD |
1094 | |
1095 | error: | |
1096 | if (!chan->sc_filter) | |
1097 | kfree(filter); | |
1098 | return ret; | |
259b6cb3 | 1099 | } |
2d2464bd MD |
1100 | |
1101 | static | |
1102 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1103 | { | |
1104 | const struct trace_syscall_entry *entry; | |
1105 | int iter = 0; | |
1106 | ||
1107 | for (entry = sc_table; | |
1108 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1109 | entry++) { | |
1110 | if (iter++ >= *pos) | |
1111 | return entry; | |
1112 | } | |
1113 | for (entry = compat_sc_table; | |
1114 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1115 | entry++) { | |
1116 | if (iter++ >= *pos) | |
1117 | return entry; | |
1118 | } | |
1119 | /* End of list */ | |
1120 | return NULL; | |
1121 | } | |
1122 | ||
1123 | static | |
1124 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1125 | { | |
1126 | return (void *) syscall_list_get_entry(pos); | |
1127 | } | |
1128 | ||
1129 | static | |
1130 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1131 | { | |
1132 | (*ppos)++; | |
1133 | return (void *) syscall_list_get_entry(ppos); | |
1134 | } | |
1135 | ||
1136 | static | |
1137 | void syscall_list_stop(struct seq_file *m, void *p) | |
1138 | { | |
1139 | } | |
1140 | ||
12e579db MD |
1141 | static |
1142 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1143 | const struct trace_syscall_entry **table, | |
1144 | unsigned int *bitness) | |
1145 | { | |
1146 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1147 | if (bitness) | |
1148 | *bitness = BITS_PER_LONG; | |
1149 | if (table) | |
1150 | *table = sc_table; | |
1151 | return 0; | |
1152 | } | |
1153 | if (!(entry >= compat_sc_table | |
1154 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1155 | return -EINVAL; | |
1156 | } | |
1157 | if (bitness) | |
1158 | *bitness = 32; | |
1159 | if (table) | |
1160 | *table = compat_sc_table; | |
1161 | return 0; | |
1162 | } | |
1163 | ||
2d2464bd MD |
1164 | static |
1165 | int syscall_list_show(struct seq_file *m, void *p) | |
1166 | { | |
1167 | const struct trace_syscall_entry *table, *entry = p; | |
1168 | unsigned int bitness; | |
d4291869 | 1169 | unsigned long index; |
12e579db | 1170 | int ret; |
d4291869 | 1171 | const char *name; |
2d2464bd | 1172 | |
12e579db MD |
1173 | ret = get_sc_table(entry, &table, &bitness); |
1174 | if (ret) | |
1175 | return ret; | |
f4855b46 MD |
1176 | if (!entry->desc) |
1177 | return 0; | |
d4291869 MD |
1178 | if (table == sc_table) { |
1179 | index = entry - table; | |
1180 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1181 | } else { | |
1182 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1183 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1184 | } | |
12e579db | 1185 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1186 | index, name, bitness); |
2d2464bd MD |
1187 | return 0; |
1188 | } | |
1189 | ||
1190 | static | |
1191 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1192 | .start = syscall_list_start, | |
1193 | .next = syscall_list_next, | |
1194 | .stop = syscall_list_stop, | |
1195 | .show = syscall_list_show, | |
1196 | }; | |
1197 | ||
1198 | static | |
1199 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1200 | { | |
1201 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1202 | } | |
1203 | ||
1204 | const struct file_operations lttng_syscall_list_fops = { | |
1205 | .owner = THIS_MODULE, | |
1206 | .open = lttng_syscall_list_open, | |
1207 | .read = seq_read, | |
1208 | .llseek = seq_lseek, | |
1209 | .release = seq_release, | |
1210 | }; | |
12e579db MD |
1211 | |
1212 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1213 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1214 | { | |
1215 | uint32_t len, sc_tables_len, bitmask_len; | |
1216 | int ret = 0, bit; | |
1217 | char *tmp_mask; | |
1218 | struct lttng_syscall_filter *filter; | |
1219 | ||
1220 | ret = get_user(len, &usyscall_mask->len); | |
1221 | if (ret) | |
1222 | return ret; | |
1223 | sc_tables_len = get_sc_tables_len(); | |
1224 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1225 | if (len < sc_tables_len) { | |
1226 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1227 | } | |
1228 | /* Array is large enough, we can copy array to user-space. */ | |
1229 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1230 | if (!tmp_mask) | |
1231 | return -ENOMEM; | |
1232 | filter = channel->sc_filter; | |
1233 | ||
1234 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
2f25059d MD |
1235 | bool state; |
1236 | ||
1237 | if (channel->sc_table) { | |
1238 | if (filter) | |
1239 | state = test_bit(bit, filter->sc); | |
1240 | else | |
1241 | state = 1; | |
1242 | } else { | |
1243 | state = 0; | |
1244 | } | |
1245 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1246 | } |
1247 | for (; bit < sc_tables_len; bit++) { | |
2f25059d MD |
1248 | bool state; |
1249 | ||
1250 | if (channel->compat_sc_table) { | |
1251 | if (filter) | |
1252 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1253 | filter->sc_compat); | |
1254 | else | |
1255 | state = 1; | |
1256 | } else { | |
1257 | state = 0; | |
1258 | } | |
1259 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1260 | } |
1261 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1262 | ret = -EFAULT; | |
1263 | kfree(tmp_mask); | |
1264 | return ret; | |
1265 | } | |
7c92789f MD |
1266 | |
1267 | int lttng_abi_syscall_list(void) | |
1268 | { | |
1269 | struct file *syscall_list_file; | |
1270 | int file_fd, ret; | |
1271 | ||
1272 | file_fd = get_unused_fd(); | |
1273 | if (file_fd < 0) { | |
1274 | ret = file_fd; | |
1275 | goto fd_error; | |
1276 | } | |
1277 | ||
1278 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1279 | <tng_syscall_list_fops, | |
1280 | NULL, O_RDWR); | |
1281 | if (IS_ERR(syscall_list_file)) { | |
1282 | ret = PTR_ERR(syscall_list_file); | |
1283 | goto file_error; | |
1284 | } | |
1285 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1286 | if (ret < 0) | |
1287 | goto open_error; | |
1288 | fd_install(file_fd, syscall_list_file); | |
1289 | if (file_fd < 0) { | |
1290 | ret = file_fd; | |
1291 | goto fd_error; | |
1292 | } | |
1293 | return file_fd; | |
1294 | ||
1295 | open_error: | |
1296 | fput(syscall_list_file); | |
1297 | file_error: | |
1298 | put_unused_fd(file_fd); | |
1299 | fd_error: | |
1300 | return ret; | |
1301 | } |