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