Commit | Line | Data |
---|---|---|
b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
259b6cb3 MD |
3 | * lttng-syscalls.c |
4 | * | |
2faf7d1b | 5 | * LTTng syscall probes. |
259b6cb3 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
259b6cb3 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
6333ace3 | 12 | #include <linux/compat.h> |
abc0446a | 13 | #include <linux/err.h> |
80f87dd2 | 14 | #include <linux/bitmap.h> |
7ca580f8 MD |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
2d2464bd | 17 | #include <linux/seq_file.h> |
d4291869 | 18 | #include <linux/stringify.h> |
082d4946 MD |
19 | #include <linux/file.h> |
20 | #include <linux/anon_inodes.h> | |
c8dfb724 | 21 | #include <linux/fcntl.h> |
3cf55950 | 22 | #include <linux/mman.h> |
259b6cb3 MD |
23 | #include <asm/ptrace.h> |
24 | #include <asm/syscall.h> | |
25 | ||
a071f25d | 26 | #include <lttng/bitfield.h> |
241ae9a8 MD |
27 | #include <wrapper/tracepoint.h> |
28 | #include <wrapper/file.h> | |
29 | #include <wrapper/rcu.h> | |
1b7b9c65 | 30 | #include <wrapper/syscall.h> |
2df37e95 | 31 | #include <lttng/events.h> |
8ced8896 | 32 | #include <lttng/utils.h> |
259b6cb3 | 33 | |
6333ace3 | 34 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
35 | # ifndef is_compat_task |
36 | # define is_compat_task() (0) | |
37 | # endif | |
6333ace3 MD |
38 | #endif |
39 | ||
1aa3298b MD |
40 | /* in_compat_syscall appears in kernel 4.6. */ |
41 | #ifndef in_compat_syscall | |
42 | #define in_compat_syscall() is_compat_task() | |
43 | #endif | |
44 | ||
5b7ac358 MD |
45 | enum sc_type { |
46 | SC_TYPE_ENTRY, | |
47 | SC_TYPE_EXIT, | |
48 | SC_TYPE_COMPAT_ENTRY, | |
49 | SC_TYPE_COMPAT_EXIT, | |
50 | }; | |
51 | ||
d4291869 MD |
52 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
53 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
54 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
55 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
56 | ||
57 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
58 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
59 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
60 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 61 | |
a93244f8 | 62 | static |
2d6d88c6 | 63 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 | 64 | static |
2d6d88c6 | 65 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 66 | |
8ced8896 FD |
67 | static |
68 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, | |
69 | long id); | |
70 | ||
3a523f5b MD |
71 | /* |
72 | * Forward declarations for old kernels. | |
73 | */ | |
74 | struct mmsghdr; | |
75 | struct rlimit64; | |
76 | struct oldold_utsname; | |
77 | struct old_utsname; | |
78 | struct sel_arg_struct; | |
79 | struct mmap_arg_struct; | |
c0b71117 | 80 | struct file_handle; |
a292e6f1 | 81 | struct user_msghdr; |
3a523f5b | 82 | |
9eb15e8b MJ |
83 | /* |
84 | * Forward declaration for kernels >= 5.6 | |
85 | */ | |
86 | struct timex; | |
edfdcb68 MJ |
87 | struct timeval; |
88 | struct itimerval; | |
89 | struct itimerspec; | |
90 | ||
91 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
92 | typedef __kernel_old_time_t time_t; | |
93 | #endif | |
9eb15e8b | 94 | |
80f87dd2 MD |
95 | #ifdef IA32_NR_syscalls |
96 | #define NR_compat_syscalls IA32_NR_syscalls | |
97 | #else | |
98 | #define NR_compat_syscalls NR_syscalls | |
99 | #endif | |
100 | ||
259b6cb3 MD |
101 | /* |
102 | * Create LTTng tracepoint probes. | |
103 | */ | |
104 | #define LTTNG_PACKAGE_BUILD | |
105 | #define CREATE_TRACE_POINTS | |
2655f9ad | 106 | #define TP_MODULE_NOINIT |
c075712b | 107 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 108 | |
a93244f8 MD |
109 | #define PARAMS(args...) args |
110 | ||
5b7ac358 | 111 | /* Handle unknown syscalls */ |
72a52753 | 112 | #undef TRACE_SYSTEM |
5b7ac358 | 113 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 114 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
115 | #undef TRACE_SYSTEM |
116 | ||
fc4f7161 MD |
117 | #define SC_ENTER |
118 | ||
fc4f7161 MD |
119 | #undef sc_exit |
120 | #define sc_exit(...) | |
b75d00c4 MD |
121 | #undef sc_in |
122 | #define sc_in(...) __VA_ARGS__ | |
123 | #undef sc_out | |
124 | #define sc_out(...) | |
125 | #undef sc_inout | |
126 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
127 | |
128 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 129 | #undef TP_PROBE_CB |
2d6d88c6 | 130 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
57ede728 | 131 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 132 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 133 | PARAMS(_fields)) |
265822ae | 134 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 135 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
136 | PARAMS(_locvar), PARAMS(_code_pre), \ |
137 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
138 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
139 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 140 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 141 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
142 | /* Enumerations only defined at first inclusion. */ |
143 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
144 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 145 | #undef TRACE_SYSTEM |
d4291869 | 146 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 147 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 148 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 149 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 150 | #undef TRACE_SYSTEM |
d4291869 | 151 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 152 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 153 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 154 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 155 | #undef TRACE_SYSTEM |
141ddf28 | 156 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
157 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
158 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
159 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
160 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 161 | #undef TP_PROBE_CB |
3bc29f0a MD |
162 | #undef _TRACE_SYSCALLS_INTEGERS_H |
163 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
164 | |
165 | /* Hijack probe callback for compat system call enter */ | |
2d6d88c6 | 166 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
771af27e | 167 | #define LTTNG_SC_COMPAT |
57ede728 | 168 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 169 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 170 | PARAMS(_fields)) |
265822ae | 171 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 172 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 173 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
174 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
175 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 176 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
177 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
178 | compat_syscall_entry_##_name) | |
141ddf28 MD |
179 | /* Enumerations only defined at inital inclusion (not here). */ |
180 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 181 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 182 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 183 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
184 | #undef TRACE_INCLUDE_FILE |
185 | #undef TRACE_SYSTEM | |
d4291869 | 186 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 187 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 188 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
189 | #undef TRACE_INCLUDE_FILE |
190 | #undef TRACE_SYSTEM | |
141ddf28 | 191 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
192 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
193 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
194 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
195 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 196 | #undef TP_PROBE_CB |
3bc29f0a MD |
197 | #undef _TRACE_SYSCALLS_INTEGERS_H |
198 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 199 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 200 | |
fc4f7161 MD |
201 | #undef SC_ENTER |
202 | ||
203 | #define SC_EXIT | |
204 | ||
fc4f7161 MD |
205 | #undef sc_exit |
206 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
207 | #undef sc_in |
208 | #define sc_in(...) | |
209 | #undef sc_out | |
210 | #define sc_out(...) __VA_ARGS__ | |
211 | #undef sc_inout | |
212 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
213 | |
214 | /* Hijack probe callback for system call exit */ | |
2d6d88c6 | 215 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
57ede728 | 216 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 217 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 218 | PARAMS(_fields)) |
265822ae | 219 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 220 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 221 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
222 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
223 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
224 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
225 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 226 | syscall_exit_##_name) |
141ddf28 MD |
227 | /* Enumerations only defined at inital inclusion (not here). */ |
228 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
229 | #define TRACE_SYSTEM syscall_exit_integers |
230 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 231 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
232 | #undef TRACE_INCLUDE_FILE |
233 | #undef TRACE_SYSTEM | |
234 | #define TRACE_SYSTEM syscall_exit_pointers | |
235 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 236 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
237 | #undef TRACE_INCLUDE_FILE |
238 | #undef TRACE_SYSTEM | |
141ddf28 | 239 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
240 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
241 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
242 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
243 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 244 | #undef TP_PROBE_CB |
3bc29f0a MD |
245 | #undef _TRACE_SYSCALLS_INTEGERS_H |
246 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
247 | |
248 | ||
249 | /* Hijack probe callback for compat system call exit */ | |
2d6d88c6 | 250 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
771af27e | 251 | #define LTTNG_SC_COMPAT |
57ede728 | 252 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 253 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 254 | PARAMS(_fields)) |
265822ae | 255 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 256 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 257 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
258 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
259 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 260 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 261 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 262 | compat_syscall_exit_##_name) |
141ddf28 MD |
263 | /* Enumerations only defined at inital inclusion (not here). */ |
264 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
265 | #define TRACE_SYSTEM compat_syscall_exit_integers |
266 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 267 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 268 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 269 | #undef TRACE_SYSTEM |
5b7ac358 MD |
270 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
271 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 272 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 273 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 274 | #undef TRACE_SYSTEM |
141ddf28 | 275 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
276 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
277 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
278 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
279 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 280 | #undef TP_PROBE_CB |
3bc29f0a MD |
281 | #undef _TRACE_SYSCALLS_INTEGERS_H |
282 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 283 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 284 | |
fc4f7161 | 285 | #undef SC_EXIT |
259b6cb3 | 286 | |
2655f9ad | 287 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
288 | #undef LTTNG_PACKAGE_BUILD |
289 | #undef CREATE_TRACE_POINTS | |
290 | ||
a93244f8 | 291 | struct trace_syscall_entry { |
2d6d88c6 | 292 | void *event_func; |
8ced8896 | 293 | void *event_notifier_func; |
a93244f8 MD |
294 | const struct lttng_event_desc *desc; |
295 | const struct lttng_event_field *fields; | |
296 | unsigned int nrargs; | |
297 | }; | |
298 | ||
299 | #define CREATE_SYSCALL_TABLE | |
300 | ||
fc4f7161 MD |
301 | #define SC_ENTER |
302 | ||
303 | #undef sc_exit | |
304 | #define sc_exit(...) | |
305 | ||
259b6cb3 | 306 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 307 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 308 | [ _nr ] = { \ |
2d6d88c6 | 309 | .event_func = __event_probe__syscall_entry_##_template, \ |
8ced8896 | 310 | .event_notifier_func = __event_notifier_probe__syscall_entry_##_template, \ |
259b6cb3 | 311 | .nrargs = (_nrargs), \ |
d4291869 MD |
312 | .fields = __event_fields___syscall_entry_##_template, \ |
313 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
314 | }, |
315 | ||
2d6d88c6 | 316 | /* Event syscall enter tracing table */ |
49c50022 | 317 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
318 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
319 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
320 | }; |
321 | ||
a93244f8 MD |
322 | #undef TRACE_SYSCALL_TABLE |
323 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
324 | [ _nr ] = { \ | |
2d6d88c6 | 325 | .event_func = __event_probe__compat_syscall_entry_##_template, \ |
8ced8896 | 326 | .event_notifier_func = __event_notifier_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 327 | .nrargs = (_nrargs), \ |
d4291869 MD |
328 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
329 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
330 | }, |
331 | ||
2d6d88c6 | 332 | /* Event compat syscall enter table */ |
a93244f8 | 333 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
334 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
335 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 336 | }; |
259b6cb3 | 337 | |
fc4f7161 MD |
338 | #undef SC_ENTER |
339 | ||
340 | #define SC_EXIT | |
341 | ||
342 | #undef sc_exit | |
343 | #define sc_exit(...) __VA_ARGS__ | |
344 | ||
5b7ac358 MD |
345 | #undef TRACE_SYSCALL_TABLE |
346 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
347 | [ _nr ] = { \ | |
2d6d88c6 | 348 | .event_func = __event_probe__syscall_exit_##_template, \ |
8ced8896 | 349 | .event_notifier_func = __event_notifier_probe__syscall_exit_##_template, \ |
5b7ac358 MD |
350 | .nrargs = (_nrargs), \ |
351 | .fields = __event_fields___syscall_exit_##_template, \ | |
352 | .desc = &__event_desc___syscall_exit_##_name, \ | |
353 | }, | |
354 | ||
2d6d88c6 | 355 | /* Event syscall exit table */ |
5b7ac358 | 356 | static const struct trace_syscall_entry sc_exit_table[] = { |
241ae9a8 MD |
357 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
358 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
359 | }; |
360 | ||
361 | #undef TRACE_SYSCALL_TABLE | |
362 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
363 | [ _nr ] = { \ | |
2d6d88c6 | 364 | .event_func = __event_probe__compat_syscall_exit_##_template, \ |
8ced8896 | 365 | .event_notifier_func = __event_notifier_probe__compat_syscall_exit_##_template, \ |
5b7ac358 MD |
366 | .nrargs = (_nrargs), \ |
367 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
368 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
369 | }, | |
370 | ||
2d6d88c6 | 371 | /* Event compat syscall exit table */ |
5b7ac358 | 372 | const struct trace_syscall_entry compat_sc_exit_table[] = { |
241ae9a8 MD |
373 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
374 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
375 | }; |
376 | ||
fc4f7161 MD |
377 | #undef SC_EXIT |
378 | ||
a93244f8 | 379 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 380 | |
80f87dd2 | 381 | struct lttng_syscall_filter { |
badfe9f5 MD |
382 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
383 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
384 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
385 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
386 | }; |
387 | ||
2d6d88c6 | 388 | static void syscall_entry_event_unknown(struct lttng_event *event, |
f405cfce MD |
389 | struct pt_regs *regs, unsigned int id) |
390 | { | |
1b7b9c65 | 391 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 392 | |
1b7b9c65 | 393 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 394 | if (unlikely(in_compat_syscall())) |
d4291869 | 395 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 396 | else |
d4291869 | 397 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
398 | } |
399 | ||
8ced8896 FD |
400 | static void syscall_entry_event_notifier_unknown( |
401 | struct lttng_event_notifier_group *notifier_group, | |
402 | struct pt_regs *regs, unsigned int id) | |
403 | { | |
404 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
405 | struct lttng_event *event; | |
406 | ||
407 | lttng_syscall_get_arguments(current, regs, args); | |
408 | if (unlikely(in_compat_syscall())) | |
409 | __event_probe__compat_syscall_notifier_entry_unknown(event, id, args); | |
410 | else | |
411 | __event_probe__syscall_notifier_entry_unknown(event, id, args); | |
412 | } | |
413 | ||
63aa9160 FD |
414 | static __always_inline |
415 | void syscall_entry_call_func(void *func, unsigned int nrargs, void *data, | |
416 | struct pt_regs *regs) | |
259b6cb3 | 417 | { |
63aa9160 | 418 | switch (nrargs) { |
259b6cb3 MD |
419 | case 0: |
420 | { | |
63aa9160 | 421 | void (*fptr)(void *__data) = func; |
259b6cb3 | 422 | |
63aa9160 | 423 | fptr(data); |
259b6cb3 MD |
424 | break; |
425 | } | |
426 | case 1: | |
427 | { | |
63aa9160 | 428 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 429 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 430 | |
1b7b9c65 | 431 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 432 | fptr(data, args[0]); |
259b6cb3 MD |
433 | break; |
434 | } | |
435 | case 2: | |
436 | { | |
437 | void (*fptr)(void *__data, | |
438 | unsigned long arg0, | |
63aa9160 | 439 | unsigned long arg1) = func; |
1b7b9c65 | 440 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 441 | |
1b7b9c65 | 442 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 443 | fptr(data, args[0], args[1]); |
259b6cb3 MD |
444 | break; |
445 | } | |
446 | case 3: | |
447 | { | |
448 | void (*fptr)(void *__data, | |
449 | unsigned long arg0, | |
450 | unsigned long arg1, | |
63aa9160 | 451 | unsigned long arg2) = func; |
1b7b9c65 | 452 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 453 | |
1b7b9c65 | 454 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 455 | fptr(data, args[0], args[1], args[2]); |
259b6cb3 MD |
456 | break; |
457 | } | |
458 | case 4: | |
459 | { | |
460 | void (*fptr)(void *__data, | |
461 | unsigned long arg0, | |
462 | unsigned long arg1, | |
463 | unsigned long arg2, | |
63aa9160 | 464 | unsigned long arg3) = func; |
1b7b9c65 | 465 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 466 | |
1b7b9c65 | 467 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 468 | fptr(data, args[0], args[1], args[2], args[3]); |
259b6cb3 MD |
469 | break; |
470 | } | |
471 | case 5: | |
472 | { | |
473 | void (*fptr)(void *__data, | |
474 | unsigned long arg0, | |
475 | unsigned long arg1, | |
476 | unsigned long arg2, | |
477 | unsigned long arg3, | |
63aa9160 | 478 | unsigned long arg4) = func; |
1b7b9c65 | 479 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 480 | |
1b7b9c65 | 481 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 482 | fptr(data, args[0], args[1], args[2], args[3], args[4]); |
259b6cb3 MD |
483 | break; |
484 | } | |
485 | case 6: | |
486 | { | |
487 | void (*fptr)(void *__data, | |
488 | unsigned long arg0, | |
489 | unsigned long arg1, | |
490 | unsigned long arg2, | |
491 | unsigned long arg3, | |
492 | unsigned long arg4, | |
63aa9160 | 493 | unsigned long arg5) = func; |
1b7b9c65 | 494 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 495 | |
1b7b9c65 | 496 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 497 | fptr(data, args[0], args[1], args[2], |
259b6cb3 MD |
498 | args[3], args[4], args[5]); |
499 | break; | |
500 | } | |
501 | default: | |
502 | break; | |
503 | } | |
504 | } | |
505 | ||
63aa9160 FD |
506 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
507 | { | |
508 | struct lttng_channel *chan = __data; | |
509 | struct lttng_event *event, *unknown_event; | |
510 | const struct trace_syscall_entry *table, *entry; | |
511 | size_t table_len; | |
512 | ||
513 | if (unlikely(in_compat_syscall())) { | |
514 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
515 | ||
516 | if (id < 0 || id >= NR_compat_syscalls | |
517 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_entry))) { | |
518 | /* System call filtered out. */ | |
519 | return; | |
520 | } | |
521 | table = compat_sc_table; | |
522 | table_len = ARRAY_SIZE(compat_sc_table); | |
523 | unknown_event = chan->sc_compat_unknown; | |
524 | } else { | |
525 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
526 | ||
527 | if (id < 0 || id >= NR_syscalls | |
528 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_entry))) { | |
529 | /* System call filtered out. */ | |
530 | return; | |
531 | } | |
532 | table = sc_table; | |
533 | table_len = ARRAY_SIZE(sc_table); | |
534 | unknown_event = chan->sc_unknown; | |
535 | } | |
536 | if (unlikely(id < 0 || id >= table_len)) { | |
537 | syscall_entry_event_unknown(unknown_event, regs, id); | |
538 | return; | |
539 | } | |
540 | if (unlikely(in_compat_syscall())) | |
541 | event = chan->compat_sc_table[id]; | |
542 | else | |
543 | event = chan->sc_table[id]; | |
544 | if (unlikely(!event)) { | |
545 | syscall_entry_event_unknown(unknown_event, regs, id); | |
546 | return; | |
547 | } | |
548 | entry = &table[id]; | |
549 | WARN_ON_ONCE(!entry); | |
550 | syscall_entry_call_func(entry->event_func, entry->nrargs, event, regs); | |
551 | } | |
552 | ||
8ced8896 FD |
553 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, long id) |
554 | { | |
555 | struct lttng_event_notifier_group *event_notifier_group = __data; | |
556 | const struct trace_syscall_entry *entry; | |
557 | struct list_head *dispatch_list; | |
558 | struct lttng_event_notifier *iter; | |
559 | size_t table_len; | |
560 | ||
561 | if (unlikely(in_compat_syscall())) { | |
562 | table_len = ARRAY_SIZE(compat_sc_table); | |
563 | if (unlikely(id < 0 || id >= table_len)) { | |
564 | return; | |
565 | } | |
566 | entry = &compat_sc_table[id]; | |
567 | dispatch_list = &event_notifier_group->event_notifier_compat_syscall_dispatch[id]; | |
568 | } else { | |
569 | table_len = ARRAY_SIZE(sc_table); | |
570 | if (unlikely(id < 0 || id >= table_len)) { | |
571 | return; | |
572 | } | |
573 | entry = &sc_table[id]; | |
574 | dispatch_list = &event_notifier_group->event_notifier_syscall_dispatch[id]; | |
575 | } | |
576 | ||
577 | if (unlikely(id < 0 || id >= table_len)) { | |
578 | syscall_entry_event_notifier_unknown(event_notifier_group, regs, id); | |
579 | return; | |
580 | } | |
581 | ||
582 | /* TODO handle unknown syscall */ | |
583 | ||
584 | list_for_each_entry_rcu(iter, dispatch_list, u.syscall.node) { | |
585 | BUG_ON(iter->u.syscall.syscall_id != id); | |
586 | syscall_entry_call_func(entry->event_notifier_func, | |
587 | entry->nrargs, iter, regs); | |
588 | } | |
589 | } | |
590 | ||
2d6d88c6 | 591 | static void syscall_exit_event_unknown(struct lttng_event *event, |
74f7b56a | 592 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 593 | { |
1b7b9c65 | 594 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 595 | |
1b7b9c65 | 596 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 597 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
598 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
599 | args); | |
600 | else | |
601 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
602 | } | |
603 | ||
2d6d88c6 | 604 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
5b7ac358 MD |
605 | { |
606 | struct lttng_channel *chan = __data; | |
607 | struct lttng_event *event, *unknown_event; | |
608 | const struct trace_syscall_entry *table, *entry; | |
609 | size_t table_len; | |
610 | long id; | |
611 | ||
612 | id = syscall_get_nr(current, regs); | |
1aa3298b | 613 | if (unlikely(in_compat_syscall())) { |
badfe9f5 MD |
614 | struct lttng_syscall_filter *filter = chan->sc_filter; |
615 | ||
616 | if (id < 0 || id >= NR_compat_syscalls | |
617 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_exit))) { | |
618 | /* System call filtered out. */ | |
619 | return; | |
5b7ac358 MD |
620 | } |
621 | table = compat_sc_exit_table; | |
622 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
623 | unknown_event = chan->compat_sc_exit_unknown; | |
624 | } else { | |
badfe9f5 MD |
625 | struct lttng_syscall_filter *filter = chan->sc_filter; |
626 | ||
627 | if (id < 0 || id >= NR_syscalls | |
628 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_exit))) { | |
629 | /* System call filtered out. */ | |
630 | return; | |
5b7ac358 MD |
631 | } |
632 | table = sc_exit_table; | |
633 | table_len = ARRAY_SIZE(sc_exit_table); | |
634 | unknown_event = chan->sc_exit_unknown; | |
635 | } | |
74f7b56a | 636 | if (unlikely(id < 0 || id >= table_len)) { |
2d6d88c6 | 637 | syscall_exit_event_unknown(unknown_event, regs, id, ret); |
5b7ac358 MD |
638 | return; |
639 | } | |
1aa3298b | 640 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
641 | event = chan->compat_sc_exit_table[id]; |
642 | else | |
643 | event = chan->sc_exit_table[id]; | |
644 | if (unlikely(!event)) { | |
2d6d88c6 | 645 | syscall_exit_event_unknown(unknown_event, regs, id, ret); |
5b7ac358 MD |
646 | return; |
647 | } | |
648 | entry = &table[id]; | |
649 | WARN_ON_ONCE(!entry); | |
650 | ||
651 | switch (entry->nrargs) { | |
652 | case 0: | |
653 | { | |
2d6d88c6 | 654 | void (*fptr)(void *__data, long ret) = entry->event_func; |
5b7ac358 | 655 | |
fc4f7161 | 656 | fptr(event, ret); |
5b7ac358 MD |
657 | break; |
658 | } | |
659 | case 1: | |
660 | { | |
661 | void (*fptr)(void *__data, | |
fc4f7161 | 662 | long ret, |
2d6d88c6 | 663 | unsigned long arg0) = entry->event_func; |
1b7b9c65 | 664 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 665 | |
1b7b9c65 | 666 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 667 | fptr(event, ret, args[0]); |
5b7ac358 MD |
668 | break; |
669 | } | |
670 | case 2: | |
671 | { | |
672 | void (*fptr)(void *__data, | |
fc4f7161 | 673 | long ret, |
5b7ac358 | 674 | unsigned long arg0, |
2d6d88c6 | 675 | unsigned long arg1) = entry->event_func; |
1b7b9c65 | 676 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 677 | |
1b7b9c65 | 678 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 679 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
680 | break; |
681 | } | |
682 | case 3: | |
683 | { | |
684 | void (*fptr)(void *__data, | |
fc4f7161 | 685 | long ret, |
5b7ac358 MD |
686 | unsigned long arg0, |
687 | unsigned long arg1, | |
2d6d88c6 | 688 | unsigned long arg2) = entry->event_func; |
1b7b9c65 | 689 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 690 | |
1b7b9c65 | 691 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 692 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
693 | break; |
694 | } | |
695 | case 4: | |
696 | { | |
697 | void (*fptr)(void *__data, | |
fc4f7161 | 698 | long ret, |
5b7ac358 MD |
699 | unsigned long arg0, |
700 | unsigned long arg1, | |
701 | unsigned long arg2, | |
2d6d88c6 | 702 | unsigned long arg3) = entry->event_func; |
1b7b9c65 | 703 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 704 | |
1b7b9c65 | 705 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 706 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
707 | break; |
708 | } | |
709 | case 5: | |
710 | { | |
711 | void (*fptr)(void *__data, | |
fc4f7161 | 712 | long ret, |
5b7ac358 MD |
713 | unsigned long arg0, |
714 | unsigned long arg1, | |
715 | unsigned long arg2, | |
716 | unsigned long arg3, | |
2d6d88c6 | 717 | unsigned long arg4) = entry->event_func; |
1b7b9c65 | 718 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 719 | |
1b7b9c65 | 720 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 721 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
722 | break; |
723 | } | |
724 | case 6: | |
725 | { | |
726 | void (*fptr)(void *__data, | |
fc4f7161 | 727 | long ret, |
5b7ac358 MD |
728 | unsigned long arg0, |
729 | unsigned long arg1, | |
730 | unsigned long arg2, | |
731 | unsigned long arg3, | |
732 | unsigned long arg4, | |
2d6d88c6 | 733 | unsigned long arg5) = entry->event_func; |
1b7b9c65 | 734 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 735 | |
1b7b9c65 | 736 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 737 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
738 | args[3], args[4], args[5]); |
739 | break; | |
740 | } | |
741 | default: | |
742 | break; | |
743 | } | |
744 | } | |
745 | ||
33a39a3c MD |
746 | /* |
747 | * noinline to diminish caller stack size. | |
748 | * Should be called with sessions lock held. | |
749 | */ | |
49c50022 | 750 | static |
2d6d88c6 | 751 | int fill_event_table(const struct trace_syscall_entry *table, size_t table_len, |
5b7ac358 MD |
752 | struct lttng_event **chan_table, struct lttng_channel *chan, |
753 | void *filter, enum sc_type type) | |
259b6cb3 | 754 | { |
2a0c4816 | 755 | const struct lttng_event_desc *desc; |
259b6cb3 | 756 | unsigned int i; |
49c50022 MD |
757 | |
758 | /* Allocate events for each syscall, insert into table */ | |
759 | for (i = 0; i < table_len; i++) { | |
760 | struct lttng_kernel_event ev; | |
2a0c4816 | 761 | desc = table[i].desc; |
49c50022 MD |
762 | |
763 | if (!desc) { | |
764 | /* Unknown syscall */ | |
765 | continue; | |
766 | } | |
767 | /* | |
768 | * Skip those already populated by previous failed | |
769 | * register for this channel. | |
770 | */ | |
771 | if (chan_table[i]) | |
772 | continue; | |
773 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
774 | switch (type) { |
775 | case SC_TYPE_ENTRY: | |
badfe9f5 MD |
776 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
777 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
778 | break; |
779 | case SC_TYPE_EXIT: | |
badfe9f5 MD |
780 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
781 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
782 | break; |
783 | case SC_TYPE_COMPAT_ENTRY: | |
badfe9f5 MD |
784 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
785 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
786 | break; |
787 | case SC_TYPE_COMPAT_EXIT: | |
badfe9f5 MD |
788 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
789 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
790 | break; |
791 | } | |
092ffe97 | 792 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN - 1); |
f8695253 | 793 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
794 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
795 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 796 | desc, ev.instrumentation); |
abc0446a MD |
797 | WARN_ON_ONCE(!chan_table[i]); |
798 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
799 | /* |
800 | * If something goes wrong in event registration | |
801 | * after the first one, we have no choice but to | |
802 | * leave the previous events in there, until | |
803 | * deleted by session teardown. | |
804 | */ | |
abc0446a | 805 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
806 | } |
807 | } | |
808 | return 0; | |
809 | } | |
810 | ||
33a39a3c MD |
811 | /* |
812 | * Should be called with sessions lock held. | |
813 | */ | |
2d6d88c6 | 814 | int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter) |
49c50022 | 815 | { |
2a0c4816 | 816 | struct lttng_kernel_event ev; |
259b6cb3 MD |
817 | int ret; |
818 | ||
263b6c88 | 819 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
820 | |
821 | if (!chan->sc_table) { | |
822 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 823 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
824 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
825 | if (!chan->sc_table) | |
826 | return -ENOMEM; | |
827 | } | |
5b7ac358 MD |
828 | if (!chan->sc_exit_table) { |
829 | /* create syscall table mapping syscall to events */ | |
830 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
831 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
832 | if (!chan->sc_exit_table) | |
833 | return -ENOMEM; | |
834 | } | |
835 | ||
259b6cb3 | 836 | |
49c50022 MD |
837 | #ifdef CONFIG_COMPAT |
838 | if (!chan->compat_sc_table) { | |
839 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 840 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 841 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
842 | if (!chan->compat_sc_table) |
843 | return -ENOMEM; | |
844 | } | |
5b7ac358 MD |
845 | |
846 | if (!chan->compat_sc_exit_table) { | |
847 | /* create syscall table mapping compat syscall to events */ | |
848 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
849 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
850 | if (!chan->compat_sc_exit_table) | |
851 | return -ENOMEM; | |
852 | } | |
49c50022 | 853 | #endif |
f405cfce | 854 | if (!chan->sc_unknown) { |
f405cfce | 855 | const struct lttng_event_desc *desc = |
d4291869 | 856 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 857 | |
f405cfce | 858 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
859 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
860 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 861 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
862 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
863 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 864 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
865 | desc, |
866 | ev.instrumentation); | |
abc0446a MD |
867 | WARN_ON_ONCE(!chan->sc_unknown); |
868 | if (IS_ERR(chan->sc_unknown)) { | |
869 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
870 | } |
871 | } | |
872 | ||
b76dc1a0 | 873 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 874 | const struct lttng_event_desc *desc = |
d4291869 | 875 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
876 | |
877 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
878 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
879 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 880 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
881 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
882 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 883 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
884 | desc, |
885 | ev.instrumentation); | |
abc0446a MD |
886 | WARN_ON_ONCE(!chan->sc_unknown); |
887 | if (IS_ERR(chan->sc_compat_unknown)) { | |
888 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
889 | } |
890 | } | |
891 | ||
5b7ac358 | 892 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 893 | const struct lttng_event_desc *desc = |
5b7ac358 | 894 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
895 | |
896 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
897 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
898 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 899 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
900 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
901 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 902 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, |
3c997079 MD |
903 | filter, desc, |
904 | ev.instrumentation); | |
5b7ac358 MD |
905 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
906 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
907 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
908 | } | |
909 | } | |
910 | ||
911 | if (!chan->sc_exit_unknown) { | |
912 | const struct lttng_event_desc *desc = | |
913 | &__event_desc___syscall_exit_unknown; | |
914 | ||
915 | memset(&ev, 0, sizeof(ev)); | |
916 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
917 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 918 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
919 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
920 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 921 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 | 922 | desc, ev.instrumentation); |
5b7ac358 MD |
923 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
924 | if (IS_ERR(chan->sc_exit_unknown)) { | |
925 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
926 | } |
927 | } | |
928 | ||
2d6d88c6 | 929 | ret = fill_event_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
930 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
931 | if (ret) | |
932 | return ret; | |
2d6d88c6 | 933 | ret = fill_event_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), |
5b7ac358 | 934 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); |
49c50022 MD |
935 | if (ret) |
936 | return ret; | |
5b7ac358 | 937 | |
49c50022 | 938 | #ifdef CONFIG_COMPAT |
2d6d88c6 | 939 | ret = fill_event_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
940 | chan->compat_sc_table, chan, filter, |
941 | SC_TYPE_COMPAT_ENTRY); | |
942 | if (ret) | |
943 | return ret; | |
2d6d88c6 | 944 | ret = fill_event_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
5b7ac358 MD |
945 | chan->compat_sc_exit_table, chan, filter, |
946 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
947 | if (ret) |
948 | return ret; | |
949 | #endif | |
badfe9f5 MD |
950 | |
951 | if (!chan->sc_filter) { | |
952 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
953 | GFP_KERNEL); | |
954 | if (!chan->sc_filter) | |
955 | return -ENOMEM; | |
956 | } | |
957 | ||
80f87dd2 MD |
958 | if (!chan->sys_enter_registered) { |
959 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 960 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
961 | if (ret) |
962 | return ret; | |
963 | chan->sys_enter_registered = 1; | |
964 | } | |
63728b02 MD |
965 | /* |
966 | * We change the name of sys_exit tracepoint due to namespace | |
967 | * conflict with sys_exit syscall entry. | |
968 | */ | |
80f87dd2 MD |
969 | if (!chan->sys_exit_registered) { |
970 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 971 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
972 | if (ret) { |
973 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 974 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
975 | return ret; |
976 | } | |
977 | chan->sys_exit_registered = 1; | |
63728b02 | 978 | } |
259b6cb3 MD |
979 | return ret; |
980 | } | |
981 | ||
982 | /* | |
8ced8896 | 983 | * Should be called with sessions lock held. |
259b6cb3 | 984 | */ |
8ced8896 FD |
985 | int lttng_syscalls_register_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter) |
986 | { | |
987 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
988 | unsigned int i; | |
989 | int ret = 0; | |
990 | ||
991 | wrapper_vmalloc_sync_mappings(); | |
992 | ||
993 | if (!group->event_notifier_syscall_dispatch) { | |
994 | group->event_notifier_syscall_dispatch = kzalloc(sizeof(struct list_head) | |
995 | * ARRAY_SIZE(sc_table), GFP_KERNEL); | |
996 | if (!group->event_notifier_syscall_dispatch) | |
997 | return -ENOMEM; | |
998 | ||
999 | /* Initialize all list_head */ | |
1000 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1001 | INIT_LIST_HEAD(&group->event_notifier_syscall_dispatch[i]); | |
1002 | } | |
1003 | ||
1004 | #ifdef CONFIG_COMPAT | |
1005 | if (!group->event_notifier_compat_syscall_dispatch) { | |
1006 | group->event_notifier_compat_syscall_dispatch = kzalloc(sizeof(struct list_head) | |
1007 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); | |
1008 | if (!group->event_notifier_syscall_dispatch) | |
1009 | return -ENOMEM; | |
1010 | ||
1011 | /* Initialize all list_head */ | |
1012 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) | |
1013 | INIT_LIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); | |
1014 | } | |
1015 | #endif | |
1016 | ||
1017 | if (!group->sys_enter_registered) { | |
1018 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
1019 | (void *) syscall_entry_event_notifier_probe, group); | |
1020 | if (ret) | |
1021 | return ret; | |
1022 | group->sys_enter_registered = 1; | |
1023 | } | |
1024 | ||
1025 | return ret; | |
1026 | } | |
1027 | ||
1028 | static int create_matching_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1029 | void *filter, const struct trace_syscall_entry *table, | |
1030 | size_t table_len, bool is_compat) | |
1031 | { | |
1032 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1033 | const struct lttng_event_desc *desc; | |
1034 | uint64_t user_token = event_notifier_enabler->base.user_token; | |
1035 | unsigned int i; | |
1036 | int ret = 0; | |
1037 | ||
1038 | /* iterate over all syscall and create event_notifier that match */ | |
1039 | for (i = 0; i < table_len; i++) { | |
1040 | struct lttng_event_notifier *event_notifier; | |
1041 | struct lttng_kernel_event_notifier event_notifier_param; | |
1042 | struct hlist_head *head; | |
1043 | int found = 0; | |
1044 | ||
1045 | desc = table[i].desc; | |
1046 | if (!desc) { | |
1047 | /* Unknown syscall */ | |
1048 | continue; | |
1049 | } | |
1050 | ||
1051 | if (!lttng_desc_match_enabler(desc, | |
1052 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1053 | continue; | |
1054 | ||
1055 | /* | |
1056 | * Check if already created. | |
1057 | */ | |
1058 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
1059 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1060 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1061 | if (event_notifier->desc == desc | |
1062 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1063 | found = 1; | |
1064 | } | |
1065 | if (found) | |
1066 | continue; | |
1067 | ||
1068 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1069 | strncat(event_notifier_param.event.name, desc->name, | |
1070 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
1071 | event_notifier_param.event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1072 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
1073 | ||
1074 | event_notifier = _lttng_event_notifier_create(desc, user_token, group, | |
1075 | &event_notifier_param, filter, | |
1076 | event_notifier_param.event.instrumentation); | |
1077 | if (IS_ERR(event_notifier)) { | |
1078 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
1079 | desc->name); | |
1080 | ret = -ENOMEM; | |
1081 | goto end; | |
1082 | } | |
1083 | ||
1084 | event_notifier->u.syscall.syscall_id = i; | |
1085 | event_notifier->u.syscall.is_compat = is_compat; | |
1086 | } | |
1087 | end: | |
1088 | return ret; | |
1089 | ||
1090 | } | |
1091 | ||
1092 | int lttng_syscals_create_matching_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter) | |
1093 | { | |
1094 | int ret; | |
1095 | ||
1096 | ret = create_matching_event_notifiers(event_notifier_enabler, filter, sc_table, | |
1097 | ARRAY_SIZE(sc_table), false); | |
1098 | if (ret) | |
1099 | goto end; | |
1100 | ||
1101 | ret = create_matching_event_notifiers(event_notifier_enabler, filter, compat_sc_table, | |
1102 | ARRAY_SIZE(compat_sc_table), true); | |
1103 | end: | |
1104 | return ret; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Unregister the syscall event_notifier probes from the callsites. | |
1109 | */ | |
1110 | int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *event_notifier_group) | |
1111 | { | |
1112 | int ret; | |
1113 | ||
1114 | /* | |
1115 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1116 | * At the moment, we don't think it's desirable to have one fired | |
1117 | * event_notifier for the entry and one for the exit of a syscall. | |
1118 | */ | |
1119 | if (event_notifier_group->sys_enter_registered) { | |
1120 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1121 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1122 | if (ret) | |
1123 | return ret; | |
1124 | event_notifier_group->sys_enter_registered = 0; | |
1125 | } | |
1126 | ||
1127 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1128 | #ifdef CONFIG_COMPAT | |
1129 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1130 | #endif | |
1131 | return 0; | |
1132 | } | |
1133 | ||
2d6d88c6 | 1134 | int lttng_syscalls_unregister_event(struct lttng_channel *chan) |
259b6cb3 MD |
1135 | { |
1136 | int ret; | |
1137 | ||
1138 | if (!chan->sc_table) | |
1139 | return 0; | |
80f87dd2 | 1140 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1141 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1142 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1143 | if (ret) |
1144 | return ret; | |
1145 | chan->sys_enter_registered = 0; | |
1146 | } | |
1147 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1148 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1149 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1150 | if (ret) |
1151 | return ret; | |
1152 | chan->sys_exit_registered = 0; | |
1153 | } | |
badfe9f5 MD |
1154 | return 0; |
1155 | } | |
1156 | ||
2d6d88c6 | 1157 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 1158 | { |
259b6cb3 | 1159 | kfree(chan->sc_table); |
5b7ac358 | 1160 | kfree(chan->sc_exit_table); |
49c50022 MD |
1161 | #ifdef CONFIG_COMPAT |
1162 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1163 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1164 | #endif |
80f87dd2 MD |
1165 | kfree(chan->sc_filter); |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | static | |
1170 | int get_syscall_nr(const char *syscall_name) | |
1171 | { | |
1172 | int syscall_nr = -1; | |
1173 | int i; | |
1174 | ||
1175 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
1176 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1177 | const char *it_name; |
80f87dd2 MD |
1178 | |
1179 | entry = &sc_table[i]; | |
1180 | if (!entry->desc) | |
1181 | continue; | |
5b7ac358 MD |
1182 | it_name = entry->desc->name; |
1183 | it_name += strlen(SYSCALL_ENTRY_STR); | |
1184 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1185 | syscall_nr = i; |
1186 | break; | |
1187 | } | |
1188 | } | |
1189 | return syscall_nr; | |
1190 | } | |
1191 | ||
1192 | static | |
1193 | int get_compat_syscall_nr(const char *syscall_name) | |
1194 | { | |
1195 | int syscall_nr = -1; | |
1196 | int i; | |
1197 | ||
1198 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
1199 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1200 | const char *it_name; |
80f87dd2 MD |
1201 | |
1202 | entry = &compat_sc_table[i]; | |
1203 | if (!entry->desc) | |
1204 | continue; | |
5b7ac358 MD |
1205 | it_name = entry->desc->name; |
1206 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1207 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1208 | syscall_nr = i; |
1209 | break; | |
1210 | } | |
1211 | } | |
1212 | return syscall_nr; | |
1213 | } | |
1214 | ||
12e579db MD |
1215 | static |
1216 | uint32_t get_sc_tables_len(void) | |
1217 | { | |
1218 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1219 | } | |
1220 | ||
badfe9f5 MD |
1221 | static |
1222 | const char *get_syscall_name(struct lttng_event *event) | |
80f87dd2 | 1223 | { |
badfe9f5 | 1224 | size_t prefix_len = 0; |
80f87dd2 | 1225 | |
badfe9f5 | 1226 | WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL); |
80f87dd2 | 1227 | |
badfe9f5 MD |
1228 | switch (event->u.syscall.entryexit) { |
1229 | case LTTNG_SYSCALL_ENTRY: | |
1230 | switch (event->u.syscall.abi) { | |
1231 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1232 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1233 | break; | |
1234 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1235 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1236 | break; | |
80f87dd2 | 1237 | } |
badfe9f5 MD |
1238 | break; |
1239 | case LTTNG_SYSCALL_EXIT: | |
1240 | switch (event->u.syscall.abi) { | |
1241 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1242 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1243 | break; | |
1244 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1245 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1246 | break; | |
80f87dd2 | 1247 | } |
badfe9f5 | 1248 | break; |
80f87dd2 | 1249 | } |
badfe9f5 MD |
1250 | WARN_ON_ONCE(prefix_len == 0); |
1251 | return event->desc->name + prefix_len; | |
1252 | } | |
1253 | ||
2d6d88c6 | 1254 | int lttng_syscall_filter_enable_event(struct lttng_channel *chan, |
badfe9f5 MD |
1255 | struct lttng_event *event) |
1256 | { | |
1257 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
1258 | const char *syscall_name; | |
1259 | unsigned long *bitmap; | |
1260 | int syscall_nr; | |
1261 | ||
1262 | WARN_ON_ONCE(!chan->sc_table); | |
1263 | ||
1264 | syscall_name = get_syscall_name(event); | |
1265 | ||
1266 | switch (event->u.syscall.abi) { | |
1267 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1268 | syscall_nr = get_syscall_nr(syscall_name); | |
1269 | break; | |
1270 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1271 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1272 | break; | |
1273 | default: | |
1274 | return -EINVAL; | |
80f87dd2 | 1275 | } |
badfe9f5 MD |
1276 | if (syscall_nr < 0) |
1277 | return -ENOENT; | |
1278 | ||
badfe9f5 MD |
1279 | switch (event->u.syscall.entryexit) { |
1280 | case LTTNG_SYSCALL_ENTRY: | |
1281 | switch (event->u.syscall.abi) { | |
1282 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1283 | bitmap = filter->sc_entry; | |
1284 | break; | |
1285 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1286 | bitmap = filter->sc_compat_entry; | |
1287 | break; | |
6d9694d8 MD |
1288 | default: |
1289 | return -EINVAL; | |
80f87dd2 | 1290 | } |
badfe9f5 MD |
1291 | break; |
1292 | case LTTNG_SYSCALL_EXIT: | |
1293 | switch (event->u.syscall.abi) { | |
1294 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1295 | bitmap = filter->sc_exit; | |
1296 | break; | |
1297 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1298 | bitmap = filter->sc_compat_exit; | |
1299 | break; | |
6d9694d8 MD |
1300 | default: |
1301 | return -EINVAL; | |
80f87dd2 | 1302 | } |
badfe9f5 MD |
1303 | break; |
1304 | default: | |
1305 | return -EINVAL; | |
80f87dd2 | 1306 | } |
badfe9f5 MD |
1307 | if (test_bit(syscall_nr, bitmap)) |
1308 | return -EEXIST; | |
1309 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1310 | return 0; |
80f87dd2 MD |
1311 | } |
1312 | ||
8ced8896 FD |
1313 | int lttng_syscall_filter_enable_event_notifier( |
1314 | struct lttng_event_notifier *event_notifier) | |
1315 | { | |
1316 | struct lttng_event_notifier_group *group = event_notifier->group; | |
1317 | unsigned int syscall_id = event_notifier->u.syscall.syscall_id; | |
1318 | struct list_head *dispatch_list; | |
1319 | ||
1320 | if (event_notifier->u.syscall.is_compat) | |
1321 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1322 | else | |
1323 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1324 | ||
1325 | list_add_rcu(&event_notifier->u.syscall.node, dispatch_list); | |
1326 | ||
1327 | return 0; | |
1328 | } | |
1329 | ||
2d6d88c6 | 1330 | int lttng_syscall_filter_disable_event(struct lttng_channel *chan, |
badfe9f5 | 1331 | struct lttng_event *event) |
80f87dd2 | 1332 | { |
badfe9f5 MD |
1333 | struct lttng_syscall_filter *filter = chan->sc_filter; |
1334 | const char *syscall_name; | |
1335 | unsigned long *bitmap; | |
1336 | int syscall_nr; | |
80f87dd2 MD |
1337 | |
1338 | WARN_ON_ONCE(!chan->sc_table); | |
1339 | ||
badfe9f5 MD |
1340 | syscall_name = get_syscall_name(event); |
1341 | ||
1342 | switch (event->u.syscall.abi) { | |
1343 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1344 | syscall_nr = get_syscall_nr(syscall_name); | |
1345 | break; | |
1346 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1347 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1348 | break; | |
1349 | default: | |
1350 | return -EINVAL; | |
80f87dd2 | 1351 | } |
badfe9f5 MD |
1352 | if (syscall_nr < 0) |
1353 | return -ENOENT; | |
80f87dd2 | 1354 | |
badfe9f5 MD |
1355 | switch (event->u.syscall.entryexit) { |
1356 | case LTTNG_SYSCALL_ENTRY: | |
1357 | switch (event->u.syscall.abi) { | |
1358 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1359 | bitmap = filter->sc_entry; | |
1360 | break; | |
1361 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1362 | bitmap = filter->sc_compat_entry; | |
1363 | break; | |
6d9694d8 MD |
1364 | default: |
1365 | return -EINVAL; | |
80f87dd2 | 1366 | } |
badfe9f5 MD |
1367 | break; |
1368 | case LTTNG_SYSCALL_EXIT: | |
1369 | switch (event->u.syscall.abi) { | |
1370 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1371 | bitmap = filter->sc_exit; | |
1372 | break; | |
1373 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1374 | bitmap = filter->sc_compat_exit; | |
1375 | break; | |
6d9694d8 MD |
1376 | default: |
1377 | return -EINVAL; | |
80f87dd2 | 1378 | } |
badfe9f5 MD |
1379 | break; |
1380 | default: | |
1381 | return -EINVAL; | |
80f87dd2 | 1382 | } |
badfe9f5 MD |
1383 | if (!test_bit(syscall_nr, bitmap)) |
1384 | return -EEXIST; | |
1385 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1386 | |
badfe9f5 | 1387 | return 0; |
259b6cb3 | 1388 | } |
2d2464bd | 1389 | |
8ced8896 FD |
1390 | int lttng_syscall_filter_disable_event_notifier( |
1391 | struct lttng_event_notifier *event_notifier) | |
1392 | { | |
1393 | list_del_rcu(&event_notifier->u.syscall.node); | |
1394 | return 0; | |
1395 | } | |
1396 | ||
2d2464bd MD |
1397 | static |
1398 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1399 | { | |
1400 | const struct trace_syscall_entry *entry; | |
1401 | int iter = 0; | |
1402 | ||
1403 | for (entry = sc_table; | |
1404 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1405 | entry++) { | |
1406 | if (iter++ >= *pos) | |
1407 | return entry; | |
1408 | } | |
1409 | for (entry = compat_sc_table; | |
1410 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1411 | entry++) { | |
1412 | if (iter++ >= *pos) | |
1413 | return entry; | |
1414 | } | |
1415 | /* End of list */ | |
1416 | return NULL; | |
1417 | } | |
1418 | ||
1419 | static | |
1420 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1421 | { | |
1422 | return (void *) syscall_list_get_entry(pos); | |
1423 | } | |
1424 | ||
1425 | static | |
1426 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1427 | { | |
1428 | (*ppos)++; | |
1429 | return (void *) syscall_list_get_entry(ppos); | |
1430 | } | |
1431 | ||
1432 | static | |
1433 | void syscall_list_stop(struct seq_file *m, void *p) | |
1434 | { | |
1435 | } | |
1436 | ||
12e579db MD |
1437 | static |
1438 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1439 | const struct trace_syscall_entry **table, | |
1440 | unsigned int *bitness) | |
1441 | { | |
1442 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1443 | if (bitness) | |
1444 | *bitness = BITS_PER_LONG; | |
1445 | if (table) | |
1446 | *table = sc_table; | |
1447 | return 0; | |
1448 | } | |
1449 | if (!(entry >= compat_sc_table | |
1450 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1451 | return -EINVAL; | |
1452 | } | |
1453 | if (bitness) | |
1454 | *bitness = 32; | |
1455 | if (table) | |
1456 | *table = compat_sc_table; | |
1457 | return 0; | |
1458 | } | |
1459 | ||
2d2464bd MD |
1460 | static |
1461 | int syscall_list_show(struct seq_file *m, void *p) | |
1462 | { | |
1463 | const struct trace_syscall_entry *table, *entry = p; | |
1464 | unsigned int bitness; | |
d4291869 | 1465 | unsigned long index; |
12e579db | 1466 | int ret; |
d4291869 | 1467 | const char *name; |
2d2464bd | 1468 | |
12e579db MD |
1469 | ret = get_sc_table(entry, &table, &bitness); |
1470 | if (ret) | |
1471 | return ret; | |
f4855b46 MD |
1472 | if (!entry->desc) |
1473 | return 0; | |
d4291869 MD |
1474 | if (table == sc_table) { |
1475 | index = entry - table; | |
1476 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1477 | } else { | |
1478 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1479 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1480 | } | |
12e579db | 1481 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1482 | index, name, bitness); |
2d2464bd MD |
1483 | return 0; |
1484 | } | |
1485 | ||
1486 | static | |
1487 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1488 | .start = syscall_list_start, | |
1489 | .next = syscall_list_next, | |
1490 | .stop = syscall_list_stop, | |
1491 | .show = syscall_list_show, | |
1492 | }; | |
1493 | ||
1494 | static | |
1495 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1496 | { | |
1497 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1498 | } | |
1499 | ||
1500 | const struct file_operations lttng_syscall_list_fops = { | |
1501 | .owner = THIS_MODULE, | |
1502 | .open = lttng_syscall_list_open, | |
1503 | .read = seq_read, | |
1504 | .llseek = seq_lseek, | |
1505 | .release = seq_release, | |
1506 | }; | |
12e579db | 1507 | |
badfe9f5 MD |
1508 | /* |
1509 | * A syscall is enabled if it is traced for either entry or exit. | |
1510 | */ | |
12e579db MD |
1511 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
1512 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1513 | { | |
1514 | uint32_t len, sc_tables_len, bitmask_len; | |
1515 | int ret = 0, bit; | |
1516 | char *tmp_mask; | |
1517 | struct lttng_syscall_filter *filter; | |
1518 | ||
1519 | ret = get_user(len, &usyscall_mask->len); | |
1520 | if (ret) | |
1521 | return ret; | |
1522 | sc_tables_len = get_sc_tables_len(); | |
1523 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1524 | if (len < sc_tables_len) { | |
1525 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1526 | } | |
1527 | /* Array is large enough, we can copy array to user-space. */ | |
1528 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1529 | if (!tmp_mask) | |
1530 | return -ENOMEM; | |
1531 | filter = channel->sc_filter; | |
1532 | ||
1533 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1534 | char state; |
2f25059d MD |
1535 | |
1536 | if (channel->sc_table) { | |
badfe9f5 MD |
1537 | if (!READ_ONCE(channel->syscall_all) && filter) |
1538 | state = test_bit(bit, filter->sc_entry) | |
1539 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1540 | else |
1541 | state = 1; | |
1542 | } else { | |
1543 | state = 0; | |
1544 | } | |
1545 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1546 | } |
1547 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1548 | char state; |
2f25059d MD |
1549 | |
1550 | if (channel->compat_sc_table) { | |
badfe9f5 | 1551 | if (!READ_ONCE(channel->syscall_all) && filter) |
2f25059d | 1552 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
badfe9f5 MD |
1553 | filter->sc_compat_entry) |
1554 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
1555 | filter->sc_compat_exit); | |
2f25059d MD |
1556 | else |
1557 | state = 1; | |
1558 | } else { | |
1559 | state = 0; | |
1560 | } | |
1561 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1562 | } |
1563 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1564 | ret = -EFAULT; | |
1565 | kfree(tmp_mask); | |
1566 | return ret; | |
1567 | } | |
082d4946 MD |
1568 | |
1569 | int lttng_abi_syscall_list(void) | |
1570 | { | |
1571 | struct file *syscall_list_file; | |
1572 | int file_fd, ret; | |
1573 | ||
4ac10b76 | 1574 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1575 | if (file_fd < 0) { |
1576 | ret = file_fd; | |
1577 | goto fd_error; | |
1578 | } | |
1579 | ||
1580 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1581 | <tng_syscall_list_fops, | |
1582 | NULL, O_RDWR); | |
1583 | if (IS_ERR(syscall_list_file)) { | |
1584 | ret = PTR_ERR(syscall_list_file); | |
1585 | goto file_error; | |
1586 | } | |
1587 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1588 | if (ret < 0) | |
1589 | goto open_error; | |
1590 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1591 | return file_fd; |
1592 | ||
1593 | open_error: | |
1594 | fput(syscall_list_file); | |
1595 | file_error: | |
1596 | put_unused_fd(file_fd); | |
1597 | fd_error: | |
1598 | return ret; | |
1599 | } |