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 | ||
241ae9a8 MD |
37 | #include <lib/bitfield.h> |
38 | #include <wrapper/tracepoint.h> | |
39 | #include <wrapper/file.h> | |
40 | #include <wrapper/rcu.h> | |
2230bf69 | 41 | #include <wrapper/syscall.h> |
241ae9a8 | 42 | #include <lttng-events.h> |
259b6cb3 | 43 | |
6333ace3 | 44 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
45 | # ifndef is_compat_task |
46 | # define is_compat_task() (0) | |
47 | # endif | |
6333ace3 MD |
48 | #endif |
49 | ||
1aa3298b MD |
50 | /* in_compat_syscall appears in kernel 4.6. */ |
51 | #ifndef in_compat_syscall | |
52 | #define in_compat_syscall() is_compat_task() | |
53 | #endif | |
54 | ||
5b7ac358 MD |
55 | enum sc_type { |
56 | SC_TYPE_ENTRY, | |
57 | SC_TYPE_EXIT, | |
58 | SC_TYPE_COMPAT_ENTRY, | |
59 | SC_TYPE_COMPAT_EXIT, | |
60 | }; | |
61 | ||
d4291869 MD |
62 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
63 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
64 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
65 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
66 | ||
67 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
68 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
69 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
70 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 71 | |
a93244f8 | 72 | static |
2faf7d1b | 73 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
74 | static |
75 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 76 | |
3a523f5b MD |
77 | /* |
78 | * Forward declarations for old kernels. | |
79 | */ | |
80 | struct mmsghdr; | |
81 | struct rlimit64; | |
82 | struct oldold_utsname; | |
83 | struct old_utsname; | |
84 | struct sel_arg_struct; | |
85 | struct mmap_arg_struct; | |
c0b71117 | 86 | struct file_handle; |
a292e6f1 | 87 | struct user_msghdr; |
3a523f5b | 88 | |
f90c9fdf MJ |
89 | /* |
90 | * Forward declaration for kernels >= 5.6 | |
91 | */ | |
92 | struct timex; | |
93 | ||
80f87dd2 MD |
94 | #ifdef IA32_NR_syscalls |
95 | #define NR_compat_syscalls IA32_NR_syscalls | |
96 | #else | |
97 | #define NR_compat_syscalls NR_syscalls | |
98 | #endif | |
99 | ||
259b6cb3 MD |
100 | /* |
101 | * Create LTTng tracepoint probes. | |
102 | */ | |
103 | #define LTTNG_PACKAGE_BUILD | |
104 | #define CREATE_TRACE_POINTS | |
2655f9ad | 105 | #define TP_MODULE_NOINIT |
c075712b | 106 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 107 | |
a93244f8 MD |
108 | #define PARAMS(args...) args |
109 | ||
5b7ac358 | 110 | /* Handle unknown syscalls */ |
72a52753 | 111 | #undef TRACE_SYSTEM |
5b7ac358 | 112 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 113 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
114 | #undef TRACE_SYSTEM |
115 | ||
fc4f7161 MD |
116 | #define SC_ENTER |
117 | ||
fc4f7161 MD |
118 | #undef sc_exit |
119 | #define sc_exit(...) | |
b75d00c4 MD |
120 | #undef sc_in |
121 | #define sc_in(...) __VA_ARGS__ | |
122 | #undef sc_out | |
123 | #define sc_out(...) | |
124 | #undef sc_inout | |
125 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
126 | |
127 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 128 | #undef TP_PROBE_CB |
259b6cb3 | 129 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 130 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 131 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 132 | PARAMS(_fields)) |
265822ae | 133 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 134 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
135 | PARAMS(_locvar), PARAMS(_code_pre), \ |
136 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
137 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
138 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 139 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 140 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
141 | /* Enumerations only defined at first inclusion. */ |
142 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
143 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 144 | #undef TRACE_SYSTEM |
d4291869 | 145 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 146 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 147 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 148 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 149 | #undef TRACE_SYSTEM |
d4291869 | 150 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 151 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 152 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 153 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 154 | #undef TRACE_SYSTEM |
141ddf28 | 155 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
156 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
157 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
158 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
159 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 160 | #undef TP_PROBE_CB |
3bc29f0a MD |
161 | #undef _TRACE_SYSCALLS_INTEGERS_H |
162 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
163 | |
164 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 165 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
771af27e | 166 | #define LTTNG_SC_COMPAT |
57ede728 | 167 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 168 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 169 | PARAMS(_fields)) |
265822ae | 170 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 171 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 172 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
173 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
174 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 175 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
176 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
177 | compat_syscall_entry_##_name) | |
141ddf28 MD |
178 | /* Enumerations only defined at inital inclusion (not here). */ |
179 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 180 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 181 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 182 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
183 | #undef TRACE_INCLUDE_FILE |
184 | #undef TRACE_SYSTEM | |
d4291869 | 185 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 186 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 187 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
188 | #undef TRACE_INCLUDE_FILE |
189 | #undef TRACE_SYSTEM | |
141ddf28 | 190 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
191 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
192 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
193 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
194 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 195 | #undef TP_PROBE_CB |
3bc29f0a MD |
196 | #undef _TRACE_SYSCALLS_INTEGERS_H |
197 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 198 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 199 | |
fc4f7161 MD |
200 | #undef SC_ENTER |
201 | ||
202 | #define SC_EXIT | |
203 | ||
fc4f7161 MD |
204 | #undef sc_exit |
205 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
206 | #undef sc_in |
207 | #define sc_in(...) | |
208 | #undef sc_out | |
209 | #define sc_out(...) __VA_ARGS__ | |
210 | #undef sc_inout | |
211 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
212 | |
213 | /* Hijack probe callback for system call exit */ | |
214 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 215 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 216 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 217 | PARAMS(_fields)) |
265822ae | 218 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 219 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 220 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
221 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
222 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
223 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
224 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 225 | syscall_exit_##_name) |
141ddf28 MD |
226 | /* Enumerations only defined at inital inclusion (not here). */ |
227 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
228 | #define TRACE_SYSTEM syscall_exit_integers |
229 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 230 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
231 | #undef TRACE_INCLUDE_FILE |
232 | #undef TRACE_SYSTEM | |
233 | #define TRACE_SYSTEM syscall_exit_pointers | |
234 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 235 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
236 | #undef TRACE_INCLUDE_FILE |
237 | #undef TRACE_SYSTEM | |
141ddf28 | 238 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
239 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
240 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
241 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
242 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 243 | #undef TP_PROBE_CB |
3bc29f0a MD |
244 | #undef _TRACE_SYSCALLS_INTEGERS_H |
245 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
246 | |
247 | ||
248 | /* Hijack probe callback for compat system call exit */ | |
249 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
771af27e | 250 | #define LTTNG_SC_COMPAT |
57ede728 | 251 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 252 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 253 | PARAMS(_fields)) |
265822ae | 254 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 255 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 256 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
257 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
258 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 259 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 260 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 261 | compat_syscall_exit_##_name) |
141ddf28 MD |
262 | /* Enumerations only defined at inital inclusion (not here). */ |
263 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
264 | #define TRACE_SYSTEM compat_syscall_exit_integers |
265 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 266 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 267 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 268 | #undef TRACE_SYSTEM |
5b7ac358 MD |
269 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
270 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 271 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 272 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 273 | #undef TRACE_SYSTEM |
141ddf28 | 274 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
275 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
276 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
277 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
278 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 279 | #undef TP_PROBE_CB |
3bc29f0a MD |
280 | #undef _TRACE_SYSCALLS_INTEGERS_H |
281 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 282 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 283 | |
fc4f7161 | 284 | #undef SC_EXIT |
259b6cb3 | 285 | |
2655f9ad | 286 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
287 | #undef LTTNG_PACKAGE_BUILD |
288 | #undef CREATE_TRACE_POINTS | |
289 | ||
a93244f8 MD |
290 | struct trace_syscall_entry { |
291 | void *func; | |
292 | const struct lttng_event_desc *desc; | |
293 | const struct lttng_event_field *fields; | |
294 | unsigned int nrargs; | |
295 | }; | |
296 | ||
297 | #define CREATE_SYSCALL_TABLE | |
298 | ||
fc4f7161 MD |
299 | #define SC_ENTER |
300 | ||
301 | #undef sc_exit | |
302 | #define sc_exit(...) | |
303 | ||
259b6cb3 | 304 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 305 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 306 | [ _nr ] = { \ |
d4291869 | 307 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 308 | .nrargs = (_nrargs), \ |
d4291869 MD |
309 | .fields = __event_fields___syscall_entry_##_template, \ |
310 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
311 | }, |
312 | ||
5b7ac358 | 313 | /* Syscall enter tracing table */ |
49c50022 | 314 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
315 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
316 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
317 | }; |
318 | ||
a93244f8 MD |
319 | #undef TRACE_SYSCALL_TABLE |
320 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
321 | [ _nr ] = { \ | |
d4291869 | 322 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 323 | .nrargs = (_nrargs), \ |
d4291869 MD |
324 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
325 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
326 | }, |
327 | ||
5b7ac358 | 328 | /* Compat syscall enter table */ |
a93244f8 | 329 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
330 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
331 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 332 | }; |
259b6cb3 | 333 | |
fc4f7161 MD |
334 | #undef SC_ENTER |
335 | ||
336 | #define SC_EXIT | |
337 | ||
338 | #undef sc_exit | |
339 | #define sc_exit(...) __VA_ARGS__ | |
340 | ||
5b7ac358 MD |
341 | #undef TRACE_SYSCALL_TABLE |
342 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
343 | [ _nr ] = { \ | |
344 | .func = __event_probe__syscall_exit_##_template, \ | |
345 | .nrargs = (_nrargs), \ | |
346 | .fields = __event_fields___syscall_exit_##_template, \ | |
347 | .desc = &__event_desc___syscall_exit_##_name, \ | |
348 | }, | |
349 | ||
350 | /* Syscall exit table */ | |
351 | static const struct trace_syscall_entry sc_exit_table[] = { | |
241ae9a8 MD |
352 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
353 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
354 | }; |
355 | ||
356 | #undef TRACE_SYSCALL_TABLE | |
357 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
358 | [ _nr ] = { \ | |
359 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
360 | .nrargs = (_nrargs), \ | |
361 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
362 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
363 | }, | |
364 | ||
365 | /* Compat syscall exit table */ | |
366 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
241ae9a8 MD |
367 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
368 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
369 | }; |
370 | ||
fc4f7161 MD |
371 | #undef SC_EXIT |
372 | ||
a93244f8 | 373 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 374 | |
80f87dd2 MD |
375 | struct lttng_syscall_filter { |
376 | DECLARE_BITMAP(sc, NR_syscalls); | |
377 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
378 | }; | |
379 | ||
a90917c3 | 380 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
381 | struct pt_regs *regs, unsigned int id) |
382 | { | |
2230bf69 | 383 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 384 | |
2230bf69 | 385 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 386 | if (unlikely(in_compat_syscall())) |
d4291869 | 387 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 388 | else |
d4291869 | 389 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
390 | } |
391 | ||
2faf7d1b | 392 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 393 | { |
a90917c3 MD |
394 | struct lttng_channel *chan = __data; |
395 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
396 | const struct trace_syscall_entry *table, *entry; |
397 | size_t table_len; | |
259b6cb3 | 398 | |
1aa3298b | 399 | if (unlikely(in_compat_syscall())) { |
80f87dd2 MD |
400 | struct lttng_syscall_filter *filter; |
401 | ||
49e2f4c4 | 402 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 403 | if (filter) { |
74f7b56a | 404 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
405 | || !test_bit(id, filter->sc_compat)) { |
406 | /* System call filtered out. */ | |
407 | return; | |
408 | } | |
409 | } | |
49c50022 | 410 | table = compat_sc_table; |
a93244f8 | 411 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
412 | unknown_event = chan->sc_compat_unknown; |
413 | } else { | |
80f87dd2 MD |
414 | struct lttng_syscall_filter *filter; |
415 | ||
49e2f4c4 | 416 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 417 | if (filter) { |
74f7b56a | 418 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
419 | || !test_bit(id, filter->sc)) { |
420 | /* System call filtered out. */ | |
421 | return; | |
422 | } | |
423 | } | |
49c50022 MD |
424 | table = sc_table; |
425 | table_len = ARRAY_SIZE(sc_table); | |
426 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 427 | } |
74f7b56a | 428 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 429 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 430 | return; |
f405cfce | 431 | } |
1aa3298b | 432 | if (unlikely(in_compat_syscall())) |
49c50022 MD |
433 | event = chan->compat_sc_table[id]; |
434 | else | |
435 | event = chan->sc_table[id]; | |
f405cfce | 436 | if (unlikely(!event)) { |
49c50022 | 437 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
438 | return; |
439 | } | |
49c50022 | 440 | entry = &table[id]; |
f405cfce | 441 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
442 | |
443 | switch (entry->nrargs) { | |
444 | case 0: | |
445 | { | |
446 | void (*fptr)(void *__data) = entry->func; | |
447 | ||
448 | fptr(event); | |
449 | break; | |
450 | } | |
451 | case 1: | |
452 | { | |
453 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
2230bf69 | 454 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 455 | |
2230bf69 | 456 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
457 | fptr(event, args[0]); |
458 | break; | |
459 | } | |
460 | case 2: | |
461 | { | |
462 | void (*fptr)(void *__data, | |
463 | unsigned long arg0, | |
464 | unsigned long arg1) = entry->func; | |
2230bf69 | 465 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 466 | |
2230bf69 | 467 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
468 | fptr(event, args[0], args[1]); |
469 | break; | |
470 | } | |
471 | case 3: | |
472 | { | |
473 | void (*fptr)(void *__data, | |
474 | unsigned long arg0, | |
475 | unsigned long arg1, | |
476 | unsigned long arg2) = entry->func; | |
2230bf69 | 477 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 478 | |
2230bf69 | 479 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
480 | fptr(event, args[0], args[1], args[2]); |
481 | break; | |
482 | } | |
483 | case 4: | |
484 | { | |
485 | void (*fptr)(void *__data, | |
486 | unsigned long arg0, | |
487 | unsigned long arg1, | |
488 | unsigned long arg2, | |
489 | unsigned long arg3) = entry->func; | |
2230bf69 | 490 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 491 | |
2230bf69 | 492 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
493 | fptr(event, args[0], args[1], args[2], args[3]); |
494 | break; | |
495 | } | |
496 | case 5: | |
497 | { | |
498 | void (*fptr)(void *__data, | |
499 | unsigned long arg0, | |
500 | unsigned long arg1, | |
501 | unsigned long arg2, | |
502 | unsigned long arg3, | |
503 | unsigned long arg4) = entry->func; | |
2230bf69 | 504 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 505 | |
2230bf69 | 506 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
507 | fptr(event, args[0], args[1], args[2], args[3], args[4]); |
508 | break; | |
509 | } | |
510 | case 6: | |
511 | { | |
512 | void (*fptr)(void *__data, | |
513 | unsigned long arg0, | |
514 | unsigned long arg1, | |
515 | unsigned long arg2, | |
516 | unsigned long arg3, | |
517 | unsigned long arg4, | |
518 | unsigned long arg5) = entry->func; | |
2230bf69 | 519 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 520 | |
2230bf69 | 521 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
522 | fptr(event, args[0], args[1], args[2], |
523 | args[3], args[4], args[5]); | |
524 | break; | |
525 | } | |
526 | default: | |
527 | break; | |
528 | } | |
529 | } | |
530 | ||
5b7ac358 | 531 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 532 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 533 | { |
2230bf69 | 534 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 535 | |
2230bf69 | 536 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 537 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
538 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
539 | args); | |
540 | else | |
541 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
542 | } | |
543 | ||
544 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
545 | { | |
546 | struct lttng_channel *chan = __data; | |
547 | struct lttng_event *event, *unknown_event; | |
548 | const struct trace_syscall_entry *table, *entry; | |
549 | size_t table_len; | |
550 | long id; | |
551 | ||
552 | id = syscall_get_nr(current, regs); | |
1aa3298b | 553 | if (unlikely(in_compat_syscall())) { |
5b7ac358 MD |
554 | struct lttng_syscall_filter *filter; |
555 | ||
49e2f4c4 | 556 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 557 | if (filter) { |
74f7b56a | 558 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
559 | || !test_bit(id, filter->sc_compat)) { |
560 | /* System call filtered out. */ | |
561 | return; | |
562 | } | |
563 | } | |
564 | table = compat_sc_exit_table; | |
565 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
566 | unknown_event = chan->compat_sc_exit_unknown; | |
567 | } else { | |
568 | struct lttng_syscall_filter *filter; | |
569 | ||
49e2f4c4 | 570 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 571 | if (filter) { |
74f7b56a | 572 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
573 | || !test_bit(id, filter->sc)) { |
574 | /* System call filtered out. */ | |
575 | return; | |
576 | } | |
577 | } | |
578 | table = sc_exit_table; | |
579 | table_len = ARRAY_SIZE(sc_exit_table); | |
580 | unknown_event = chan->sc_exit_unknown; | |
581 | } | |
74f7b56a | 582 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
583 | syscall_exit_unknown(unknown_event, regs, id, ret); |
584 | return; | |
585 | } | |
1aa3298b | 586 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
587 | event = chan->compat_sc_exit_table[id]; |
588 | else | |
589 | event = chan->sc_exit_table[id]; | |
590 | if (unlikely(!event)) { | |
591 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
592 | return; | |
593 | } | |
594 | entry = &table[id]; | |
595 | WARN_ON_ONCE(!entry); | |
596 | ||
597 | switch (entry->nrargs) { | |
598 | case 0: | |
599 | { | |
fc4f7161 | 600 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 601 | |
fc4f7161 | 602 | fptr(event, ret); |
5b7ac358 MD |
603 | break; |
604 | } | |
605 | case 1: | |
606 | { | |
607 | void (*fptr)(void *__data, | |
fc4f7161 | 608 | long ret, |
5b7ac358 | 609 | unsigned long arg0) = entry->func; |
2230bf69 | 610 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 611 | |
2230bf69 | 612 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 613 | fptr(event, ret, args[0]); |
5b7ac358 MD |
614 | break; |
615 | } | |
616 | case 2: | |
617 | { | |
618 | void (*fptr)(void *__data, | |
fc4f7161 | 619 | long ret, |
5b7ac358 MD |
620 | unsigned long arg0, |
621 | unsigned long arg1) = entry->func; | |
2230bf69 | 622 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 623 | |
2230bf69 | 624 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 625 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
626 | break; |
627 | } | |
628 | case 3: | |
629 | { | |
630 | void (*fptr)(void *__data, | |
fc4f7161 | 631 | long ret, |
5b7ac358 MD |
632 | unsigned long arg0, |
633 | unsigned long arg1, | |
634 | unsigned long arg2) = entry->func; | |
2230bf69 | 635 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 636 | |
2230bf69 | 637 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 638 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
639 | break; |
640 | } | |
641 | case 4: | |
642 | { | |
643 | void (*fptr)(void *__data, | |
fc4f7161 | 644 | long ret, |
5b7ac358 MD |
645 | unsigned long arg0, |
646 | unsigned long arg1, | |
647 | unsigned long arg2, | |
648 | unsigned long arg3) = entry->func; | |
2230bf69 | 649 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 650 | |
2230bf69 | 651 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 652 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
653 | break; |
654 | } | |
655 | case 5: | |
656 | { | |
657 | void (*fptr)(void *__data, | |
fc4f7161 | 658 | long ret, |
5b7ac358 MD |
659 | unsigned long arg0, |
660 | unsigned long arg1, | |
661 | unsigned long arg2, | |
662 | unsigned long arg3, | |
663 | unsigned long arg4) = entry->func; | |
2230bf69 | 664 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 665 | |
2230bf69 | 666 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 667 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
668 | break; |
669 | } | |
670 | case 6: | |
671 | { | |
672 | void (*fptr)(void *__data, | |
fc4f7161 | 673 | long ret, |
5b7ac358 MD |
674 | unsigned long arg0, |
675 | unsigned long arg1, | |
676 | unsigned long arg2, | |
677 | unsigned long arg3, | |
678 | unsigned long arg4, | |
679 | unsigned long arg5) = entry->func; | |
2230bf69 | 680 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 681 | |
2230bf69 | 682 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 683 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
684 | args[3], args[4], args[5]); |
685 | break; | |
686 | } | |
687 | default: | |
688 | break; | |
689 | } | |
690 | } | |
691 | ||
33a39a3c MD |
692 | /* |
693 | * noinline to diminish caller stack size. | |
694 | * Should be called with sessions lock held. | |
695 | */ | |
49c50022 MD |
696 | static |
697 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
698 | struct lttng_event **chan_table, struct lttng_channel *chan, |
699 | void *filter, enum sc_type type) | |
259b6cb3 | 700 | { |
2a0c4816 | 701 | const struct lttng_event_desc *desc; |
259b6cb3 | 702 | unsigned int i; |
49c50022 MD |
703 | |
704 | /* Allocate events for each syscall, insert into table */ | |
705 | for (i = 0; i < table_len; i++) { | |
706 | struct lttng_kernel_event ev; | |
2a0c4816 | 707 | desc = table[i].desc; |
49c50022 MD |
708 | |
709 | if (!desc) { | |
710 | /* Unknown syscall */ | |
711 | continue; | |
712 | } | |
713 | /* | |
714 | * Skip those already populated by previous failed | |
715 | * register for this channel. | |
716 | */ | |
717 | if (chan_table[i]) | |
718 | continue; | |
719 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
720 | switch (type) { |
721 | case SC_TYPE_ENTRY: | |
722 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
723 | LTTNG_KERNEL_SYM_NAME_LEN); | |
724 | break; | |
725 | case SC_TYPE_EXIT: | |
726 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
727 | LTTNG_KERNEL_SYM_NAME_LEN); | |
728 | break; | |
729 | case SC_TYPE_COMPAT_ENTRY: | |
730 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
731 | LTTNG_KERNEL_SYM_NAME_LEN); | |
732 | break; | |
733 | case SC_TYPE_COMPAT_EXIT: | |
734 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
735 | LTTNG_KERNEL_SYM_NAME_LEN); | |
736 | break; | |
737 | default: | |
738 | BUG_ON(1); | |
739 | break; | |
740 | } | |
741 | strncat(ev.name, desc->name, | |
742 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 743 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
744 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
745 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 746 | desc, ev.instrumentation); |
abc0446a MD |
747 | WARN_ON_ONCE(!chan_table[i]); |
748 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
749 | /* |
750 | * If something goes wrong in event registration | |
751 | * after the first one, we have no choice but to | |
752 | * leave the previous events in there, until | |
753 | * deleted by session teardown. | |
754 | */ | |
abc0446a | 755 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
756 | } |
757 | } | |
758 | return 0; | |
759 | } | |
760 | ||
33a39a3c MD |
761 | /* |
762 | * Should be called with sessions lock held. | |
763 | */ | |
a90917c3 | 764 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 765 | { |
2a0c4816 | 766 | struct lttng_kernel_event ev; |
259b6cb3 MD |
767 | int ret; |
768 | ||
769 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
770 | |
771 | if (!chan->sc_table) { | |
772 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 773 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
774 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
775 | if (!chan->sc_table) | |
776 | return -ENOMEM; | |
777 | } | |
5b7ac358 MD |
778 | if (!chan->sc_exit_table) { |
779 | /* create syscall table mapping syscall to events */ | |
780 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
781 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
782 | if (!chan->sc_exit_table) | |
783 | return -ENOMEM; | |
784 | } | |
785 | ||
259b6cb3 | 786 | |
49c50022 MD |
787 | #ifdef CONFIG_COMPAT |
788 | if (!chan->compat_sc_table) { | |
789 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 790 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 791 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
792 | if (!chan->compat_sc_table) |
793 | return -ENOMEM; | |
794 | } | |
5b7ac358 MD |
795 | |
796 | if (!chan->compat_sc_exit_table) { | |
797 | /* create syscall table mapping compat syscall to events */ | |
798 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
799 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
800 | if (!chan->compat_sc_exit_table) | |
801 | return -ENOMEM; | |
802 | } | |
49c50022 | 803 | #endif |
f405cfce | 804 | if (!chan->sc_unknown) { |
f405cfce | 805 | const struct lttng_event_desc *desc = |
d4291869 | 806 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 807 | |
f405cfce | 808 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
809 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
810 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
811 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
812 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
813 | desc, |
814 | ev.instrumentation); | |
abc0446a MD |
815 | WARN_ON_ONCE(!chan->sc_unknown); |
816 | if (IS_ERR(chan->sc_unknown)) { | |
817 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
818 | } |
819 | } | |
820 | ||
b76dc1a0 | 821 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 822 | const struct lttng_event_desc *desc = |
d4291869 | 823 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
824 | |
825 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
826 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
827 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
828 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
829 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
830 | desc, |
831 | ev.instrumentation); | |
abc0446a MD |
832 | WARN_ON_ONCE(!chan->sc_unknown); |
833 | if (IS_ERR(chan->sc_compat_unknown)) { | |
834 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
835 | } |
836 | } | |
837 | ||
5b7ac358 | 838 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 839 | const struct lttng_event_desc *desc = |
5b7ac358 | 840 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
841 | |
842 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
843 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
844 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
845 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
846 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, | |
3c997079 MD |
847 | filter, desc, |
848 | ev.instrumentation); | |
5b7ac358 MD |
849 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
850 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
851 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
852 | } | |
853 | } | |
854 | ||
855 | if (!chan->sc_exit_unknown) { | |
856 | const struct lttng_event_desc *desc = | |
857 | &__event_desc___syscall_exit_unknown; | |
858 | ||
859 | memset(&ev, 0, sizeof(ev)); | |
860 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
861 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
862 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
863 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 864 | desc, ev.instrumentation); |
5b7ac358 MD |
865 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
866 | if (IS_ERR(chan->sc_exit_unknown)) { | |
867 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
868 | } |
869 | } | |
870 | ||
49c50022 | 871 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
872 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
873 | if (ret) | |
874 | return ret; | |
875 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
876 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
877 | if (ret) |
878 | return ret; | |
5b7ac358 | 879 | |
49c50022 | 880 | #ifdef CONFIG_COMPAT |
a93244f8 | 881 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
882 | chan->compat_sc_table, chan, filter, |
883 | SC_TYPE_COMPAT_ENTRY); | |
884 | if (ret) | |
885 | return ret; | |
886 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
887 | chan->compat_sc_exit_table, chan, filter, | |
888 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
889 | if (ret) |
890 | return ret; | |
891 | #endif | |
80f87dd2 MD |
892 | if (!chan->sys_enter_registered) { |
893 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
894 | (void *) syscall_entry_probe, chan); | |
895 | if (ret) | |
896 | return ret; | |
897 | chan->sys_enter_registered = 1; | |
898 | } | |
63728b02 MD |
899 | /* |
900 | * We change the name of sys_exit tracepoint due to namespace | |
901 | * conflict with sys_exit syscall entry. | |
902 | */ | |
80f87dd2 MD |
903 | if (!chan->sys_exit_registered) { |
904 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 905 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
906 | if (ret) { |
907 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
908 | (void *) syscall_entry_probe, chan)); | |
909 | return ret; | |
910 | } | |
911 | chan->sys_exit_registered = 1; | |
63728b02 | 912 | } |
259b6cb3 MD |
913 | return ret; |
914 | } | |
915 | ||
916 | /* | |
917 | * Only called at session destruction. | |
918 | */ | |
a90917c3 | 919 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
920 | { |
921 | int ret; | |
922 | ||
923 | if (!chan->sc_table) | |
924 | return 0; | |
80f87dd2 | 925 | if (chan->sys_enter_registered) { |
b276cb13 FD |
926 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
927 | (void *) syscall_entry_probe, chan); | |
80f87dd2 MD |
928 | if (ret) |
929 | return ret; | |
930 | chan->sys_enter_registered = 0; | |
931 | } | |
932 | if (chan->sys_exit_registered) { | |
b276cb13 FD |
933 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
934 | (void *) syscall_exit_probe, chan); | |
80f87dd2 MD |
935 | if (ret) |
936 | return ret; | |
937 | chan->sys_exit_registered = 0; | |
938 | } | |
a90917c3 | 939 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 940 | kfree(chan->sc_table); |
5b7ac358 | 941 | kfree(chan->sc_exit_table); |
49c50022 MD |
942 | #ifdef CONFIG_COMPAT |
943 | kfree(chan->compat_sc_table); | |
5b7ac358 | 944 | kfree(chan->compat_sc_exit_table); |
49c50022 | 945 | #endif |
80f87dd2 MD |
946 | kfree(chan->sc_filter); |
947 | return 0; | |
948 | } | |
949 | ||
950 | static | |
951 | int get_syscall_nr(const char *syscall_name) | |
952 | { | |
953 | int syscall_nr = -1; | |
954 | int i; | |
955 | ||
956 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
957 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 958 | const char *it_name; |
80f87dd2 MD |
959 | |
960 | entry = &sc_table[i]; | |
961 | if (!entry->desc) | |
962 | continue; | |
5b7ac358 MD |
963 | it_name = entry->desc->name; |
964 | it_name += strlen(SYSCALL_ENTRY_STR); | |
965 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
966 | syscall_nr = i; |
967 | break; | |
968 | } | |
969 | } | |
970 | return syscall_nr; | |
971 | } | |
972 | ||
973 | static | |
974 | int get_compat_syscall_nr(const char *syscall_name) | |
975 | { | |
976 | int syscall_nr = -1; | |
977 | int i; | |
978 | ||
979 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
980 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 981 | const char *it_name; |
80f87dd2 MD |
982 | |
983 | entry = &compat_sc_table[i]; | |
984 | if (!entry->desc) | |
985 | continue; | |
5b7ac358 MD |
986 | it_name = entry->desc->name; |
987 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
988 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
989 | syscall_nr = i; |
990 | break; | |
991 | } | |
992 | } | |
993 | return syscall_nr; | |
994 | } | |
995 | ||
12e579db MD |
996 | static |
997 | uint32_t get_sc_tables_len(void) | |
998 | { | |
999 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1000 | } | |
1001 | ||
80f87dd2 MD |
1002 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
1003 | const char *name) | |
1004 | { | |
1005 | int syscall_nr, compat_syscall_nr, ret; | |
1006 | struct lttng_syscall_filter *filter; | |
1007 | ||
1008 | WARN_ON_ONCE(!chan->sc_table); | |
1009 | ||
1010 | if (!name) { | |
1011 | /* Enable all system calls by removing filter */ | |
1012 | if (chan->sc_filter) { | |
1013 | filter = chan->sc_filter; | |
1014 | rcu_assign_pointer(chan->sc_filter, NULL); | |
1015 | synchronize_trace(); | |
1016 | kfree(filter); | |
1017 | } | |
1018 | chan->syscall_all = 1; | |
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | if (!chan->sc_filter) { | |
1023 | if (chan->syscall_all) { | |
1024 | /* | |
1025 | * All syscalls are already enabled. | |
1026 | */ | |
1027 | return -EEXIST; | |
1028 | } | |
1029 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1030 | GFP_KERNEL); | |
1031 | if (!filter) | |
1032 | return -ENOMEM; | |
1033 | } else { | |
1034 | filter = chan->sc_filter; | |
1035 | } | |
1036 | syscall_nr = get_syscall_nr(name); | |
1037 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1038 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1039 | ret = -ENOENT; | |
1040 | goto error; | |
1041 | } | |
1042 | if (syscall_nr >= 0) { | |
1043 | if (test_bit(syscall_nr, filter->sc)) { | |
1044 | ret = -EEXIST; | |
1045 | goto error; | |
1046 | } | |
1047 | bitmap_set(filter->sc, syscall_nr, 1); | |
1048 | } | |
1049 | if (compat_syscall_nr >= 0) { | |
1050 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1051 | ret = -EEXIST; | |
1052 | goto error; | |
1053 | } | |
1054 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1055 | } | |
1056 | if (!chan->sc_filter) | |
1057 | rcu_assign_pointer(chan->sc_filter, filter); | |
1058 | return 0; | |
1059 | ||
1060 | error: | |
1061 | if (!chan->sc_filter) | |
1062 | kfree(filter); | |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1067 | const char *name) | |
1068 | { | |
1069 | int syscall_nr, compat_syscall_nr, ret; | |
1070 | struct lttng_syscall_filter *filter; | |
1071 | ||
1072 | WARN_ON_ONCE(!chan->sc_table); | |
1073 | ||
1074 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1075 | if (!chan->syscall_all) |
1076 | return -EEXIST; | |
80f87dd2 MD |
1077 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1078 | GFP_KERNEL); | |
1079 | if (!filter) | |
1080 | return -ENOMEM; | |
1081 | /* Trace all system calls, then apply disable. */ | |
1082 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1083 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1084 | } else { | |
1085 | filter = chan->sc_filter; | |
1086 | } | |
1087 | ||
72814741 | 1088 | if (!name) { |
404e87bf MD |
1089 | /* Fail if all syscalls are already disabled. */ |
1090 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1091 | && bitmap_empty(filter->sc_compat, | |
1092 | NR_compat_syscalls)) { | |
1093 | ret = -EEXIST; | |
1094 | goto error; | |
1095 | } | |
1096 | ||
72814741 MD |
1097 | /* Disable all system calls */ |
1098 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1099 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1100 | goto apply_filter; | |
1101 | } | |
80f87dd2 MD |
1102 | syscall_nr = get_syscall_nr(name); |
1103 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1104 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1105 | ret = -ENOENT; | |
1106 | goto error; | |
1107 | } | |
1108 | if (syscall_nr >= 0) { | |
cecef7f8 | 1109 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1110 | ret = -EEXIST; |
1111 | goto error; | |
1112 | } | |
cecef7f8 | 1113 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1114 | } |
1115 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1116 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1117 | ret = -EEXIST; |
1118 | goto error; | |
1119 | } | |
cecef7f8 | 1120 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1121 | } |
72814741 | 1122 | apply_filter: |
80f87dd2 MD |
1123 | if (!chan->sc_filter) |
1124 | rcu_assign_pointer(chan->sc_filter, filter); | |
1125 | chan->syscall_all = 0; | |
259b6cb3 | 1126 | return 0; |
80f87dd2 MD |
1127 | |
1128 | error: | |
1129 | if (!chan->sc_filter) | |
1130 | kfree(filter); | |
1131 | return ret; | |
259b6cb3 | 1132 | } |
2d2464bd MD |
1133 | |
1134 | static | |
1135 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1136 | { | |
1137 | const struct trace_syscall_entry *entry; | |
1138 | int iter = 0; | |
1139 | ||
1140 | for (entry = sc_table; | |
1141 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1142 | entry++) { | |
1143 | if (iter++ >= *pos) | |
1144 | return entry; | |
1145 | } | |
1146 | for (entry = compat_sc_table; | |
1147 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1148 | entry++) { | |
1149 | if (iter++ >= *pos) | |
1150 | return entry; | |
1151 | } | |
1152 | /* End of list */ | |
1153 | return NULL; | |
1154 | } | |
1155 | ||
1156 | static | |
1157 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1158 | { | |
1159 | return (void *) syscall_list_get_entry(pos); | |
1160 | } | |
1161 | ||
1162 | static | |
1163 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1164 | { | |
1165 | (*ppos)++; | |
1166 | return (void *) syscall_list_get_entry(ppos); | |
1167 | } | |
1168 | ||
1169 | static | |
1170 | void syscall_list_stop(struct seq_file *m, void *p) | |
1171 | { | |
1172 | } | |
1173 | ||
12e579db MD |
1174 | static |
1175 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1176 | const struct trace_syscall_entry **table, | |
1177 | unsigned int *bitness) | |
1178 | { | |
1179 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1180 | if (bitness) | |
1181 | *bitness = BITS_PER_LONG; | |
1182 | if (table) | |
1183 | *table = sc_table; | |
1184 | return 0; | |
1185 | } | |
1186 | if (!(entry >= compat_sc_table | |
1187 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1188 | return -EINVAL; | |
1189 | } | |
1190 | if (bitness) | |
1191 | *bitness = 32; | |
1192 | if (table) | |
1193 | *table = compat_sc_table; | |
1194 | return 0; | |
1195 | } | |
1196 | ||
2d2464bd MD |
1197 | static |
1198 | int syscall_list_show(struct seq_file *m, void *p) | |
1199 | { | |
1200 | const struct trace_syscall_entry *table, *entry = p; | |
1201 | unsigned int bitness; | |
d4291869 | 1202 | unsigned long index; |
12e579db | 1203 | int ret; |
d4291869 | 1204 | const char *name; |
2d2464bd | 1205 | |
12e579db MD |
1206 | ret = get_sc_table(entry, &table, &bitness); |
1207 | if (ret) | |
1208 | return ret; | |
f4855b46 MD |
1209 | if (!entry->desc) |
1210 | return 0; | |
d4291869 MD |
1211 | if (table == sc_table) { |
1212 | index = entry - table; | |
1213 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1214 | } else { | |
1215 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1216 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1217 | } | |
12e579db | 1218 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1219 | index, name, bitness); |
2d2464bd MD |
1220 | return 0; |
1221 | } | |
1222 | ||
1223 | static | |
1224 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1225 | .start = syscall_list_start, | |
1226 | .next = syscall_list_next, | |
1227 | .stop = syscall_list_stop, | |
1228 | .show = syscall_list_show, | |
1229 | }; | |
1230 | ||
1231 | static | |
1232 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1233 | { | |
1234 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1235 | } | |
1236 | ||
1237 | const struct file_operations lttng_syscall_list_fops = { | |
1238 | .owner = THIS_MODULE, | |
1239 | .open = lttng_syscall_list_open, | |
1240 | .read = seq_read, | |
1241 | .llseek = seq_lseek, | |
1242 | .release = seq_release, | |
1243 | }; | |
12e579db MD |
1244 | |
1245 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1246 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1247 | { | |
1248 | uint32_t len, sc_tables_len, bitmask_len; | |
1249 | int ret = 0, bit; | |
1250 | char *tmp_mask; | |
1251 | struct lttng_syscall_filter *filter; | |
1252 | ||
1253 | ret = get_user(len, &usyscall_mask->len); | |
1254 | if (ret) | |
1255 | return ret; | |
1256 | sc_tables_len = get_sc_tables_len(); | |
1257 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1258 | if (len < sc_tables_len) { | |
1259 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1260 | } | |
1261 | /* Array is large enough, we can copy array to user-space. */ | |
1262 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1263 | if (!tmp_mask) | |
1264 | return -ENOMEM; | |
1265 | filter = channel->sc_filter; | |
1266 | ||
1267 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
8aa41af5 | 1268 | char state; |
2f25059d MD |
1269 | |
1270 | if (channel->sc_table) { | |
1271 | if (filter) | |
1272 | state = test_bit(bit, filter->sc); | |
1273 | else | |
1274 | state = 1; | |
1275 | } else { | |
1276 | state = 0; | |
1277 | } | |
1278 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1279 | } |
1280 | for (; bit < sc_tables_len; bit++) { | |
8aa41af5 | 1281 | char state; |
2f25059d MD |
1282 | |
1283 | if (channel->compat_sc_table) { | |
1284 | if (filter) | |
1285 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1286 | filter->sc_compat); | |
1287 | else | |
1288 | state = 1; | |
1289 | } else { | |
1290 | state = 0; | |
1291 | } | |
1292 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1293 | } |
1294 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1295 | ret = -EFAULT; | |
1296 | kfree(tmp_mask); | |
1297 | return ret; | |
1298 | } | |
082d4946 MD |
1299 | |
1300 | int lttng_abi_syscall_list(void) | |
1301 | { | |
1302 | struct file *syscall_list_file; | |
1303 | int file_fd, ret; | |
1304 | ||
4ac10b76 | 1305 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1306 | if (file_fd < 0) { |
1307 | ret = file_fd; | |
1308 | goto fd_error; | |
1309 | } | |
1310 | ||
1311 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1312 | <tng_syscall_list_fops, | |
1313 | NULL, O_RDWR); | |
1314 | if (IS_ERR(syscall_list_file)) { | |
1315 | ret = PTR_ERR(syscall_list_file); | |
1316 | goto file_error; | |
1317 | } | |
1318 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1319 | if (ret < 0) | |
1320 | goto open_error; | |
1321 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1322 | return file_fd; |
1323 | ||
1324 | open_error: | |
1325 | fput(syscall_list_file); | |
1326 | file_error: | |
1327 | put_unused_fd(file_fd); | |
1328 | fd_error: | |
1329 | return ret; | |
1330 | } |