Commit | Line | Data |
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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> |
8a8ac9a8 | 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 | |
8a8ac9a8 FD |
67 | static |
68 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, | |
69 | long id); | |
70 | static | |
71 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
72 | long ret); | |
73 | ||
3a523f5b MD |
74 | /* |
75 | * Forward declarations for old kernels. | |
76 | */ | |
77 | struct mmsghdr; | |
78 | struct rlimit64; | |
79 | struct oldold_utsname; | |
80 | struct old_utsname; | |
81 | struct sel_arg_struct; | |
82 | struct mmap_arg_struct; | |
c0b71117 | 83 | struct file_handle; |
a292e6f1 | 84 | struct user_msghdr; |
3a523f5b | 85 | |
9eb15e8b MJ |
86 | /* |
87 | * Forward declaration for kernels >= 5.6 | |
88 | */ | |
89 | struct timex; | |
edfdcb68 MJ |
90 | struct timeval; |
91 | struct itimerval; | |
92 | struct itimerspec; | |
93 | ||
94 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
95 | typedef __kernel_old_time_t time_t; | |
96 | #endif | |
9eb15e8b | 97 | |
80f87dd2 MD |
98 | #ifdef IA32_NR_syscalls |
99 | #define NR_compat_syscalls IA32_NR_syscalls | |
100 | #else | |
101 | #define NR_compat_syscalls NR_syscalls | |
102 | #endif | |
103 | ||
259b6cb3 MD |
104 | /* |
105 | * Create LTTng tracepoint probes. | |
106 | */ | |
107 | #define LTTNG_PACKAGE_BUILD | |
108 | #define CREATE_TRACE_POINTS | |
2655f9ad | 109 | #define TP_MODULE_NOINIT |
c075712b | 110 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 111 | |
a93244f8 MD |
112 | #define PARAMS(args...) args |
113 | ||
5b7ac358 | 114 | /* Handle unknown syscalls */ |
72a52753 | 115 | #undef TRACE_SYSTEM |
5b7ac358 | 116 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 117 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
118 | #undef TRACE_SYSTEM |
119 | ||
fc4f7161 MD |
120 | #define SC_ENTER |
121 | ||
fc4f7161 MD |
122 | #undef sc_exit |
123 | #define sc_exit(...) | |
b75d00c4 MD |
124 | #undef sc_in |
125 | #define sc_in(...) __VA_ARGS__ | |
126 | #undef sc_out | |
127 | #define sc_out(...) | |
128 | #undef sc_inout | |
129 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
130 | |
131 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 132 | #undef TP_PROBE_CB |
2d6d88c6 | 133 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
57ede728 | 134 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 135 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 136 | PARAMS(_fields)) |
265822ae | 137 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 138 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
139 | PARAMS(_locvar), PARAMS(_code_pre), \ |
140 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
141 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
142 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 143 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 144 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
145 | /* Enumerations only defined at first inclusion. */ |
146 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
147 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 148 | #undef TRACE_SYSTEM |
d4291869 | 149 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 150 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 151 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 152 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 153 | #undef TRACE_SYSTEM |
d4291869 | 154 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 155 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 156 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 157 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 158 | #undef TRACE_SYSTEM |
141ddf28 | 159 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
160 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
161 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
162 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
163 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 164 | #undef TP_PROBE_CB |
3bc29f0a MD |
165 | #undef _TRACE_SYSCALLS_INTEGERS_H |
166 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
167 | |
168 | /* Hijack probe callback for compat system call enter */ | |
2d6d88c6 | 169 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
771af27e | 170 | #define LTTNG_SC_COMPAT |
57ede728 | 171 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 172 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 173 | PARAMS(_fields)) |
265822ae | 174 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 175 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 176 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
177 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
178 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 179 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
180 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
181 | compat_syscall_entry_##_name) | |
141ddf28 MD |
182 | /* Enumerations only defined at inital inclusion (not here). */ |
183 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 184 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 185 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 186 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
187 | #undef TRACE_INCLUDE_FILE |
188 | #undef TRACE_SYSTEM | |
d4291869 | 189 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 190 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 191 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
192 | #undef TRACE_INCLUDE_FILE |
193 | #undef TRACE_SYSTEM | |
141ddf28 | 194 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
195 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
196 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
197 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
198 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 199 | #undef TP_PROBE_CB |
3bc29f0a MD |
200 | #undef _TRACE_SYSCALLS_INTEGERS_H |
201 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 202 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 203 | |
fc4f7161 MD |
204 | #undef SC_ENTER |
205 | ||
206 | #define SC_EXIT | |
207 | ||
fc4f7161 MD |
208 | #undef sc_exit |
209 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
210 | #undef sc_in |
211 | #define sc_in(...) | |
212 | #undef sc_out | |
213 | #define sc_out(...) __VA_ARGS__ | |
214 | #undef sc_inout | |
215 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
216 | |
217 | /* Hijack probe callback for system call exit */ | |
2d6d88c6 | 218 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
57ede728 | 219 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 220 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 221 | PARAMS(_fields)) |
265822ae | 222 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 223 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 224 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
225 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
226 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
227 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
228 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 229 | syscall_exit_##_name) |
141ddf28 MD |
230 | /* Enumerations only defined at inital inclusion (not here). */ |
231 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
232 | #define TRACE_SYSTEM syscall_exit_integers |
233 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 234 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
235 | #undef TRACE_INCLUDE_FILE |
236 | #undef TRACE_SYSTEM | |
237 | #define TRACE_SYSTEM syscall_exit_pointers | |
238 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 239 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
240 | #undef TRACE_INCLUDE_FILE |
241 | #undef TRACE_SYSTEM | |
141ddf28 | 242 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
243 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
244 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
245 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
246 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 247 | #undef TP_PROBE_CB |
3bc29f0a MD |
248 | #undef _TRACE_SYSCALLS_INTEGERS_H |
249 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
250 | |
251 | ||
252 | /* Hijack probe callback for compat system call exit */ | |
2d6d88c6 | 253 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
771af27e | 254 | #define LTTNG_SC_COMPAT |
57ede728 | 255 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 256 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 257 | PARAMS(_fields)) |
265822ae | 258 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 259 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 260 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
261 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
262 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 263 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 264 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 265 | compat_syscall_exit_##_name) |
141ddf28 MD |
266 | /* Enumerations only defined at inital inclusion (not here). */ |
267 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
268 | #define TRACE_SYSTEM compat_syscall_exit_integers |
269 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 270 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 271 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 272 | #undef TRACE_SYSTEM |
5b7ac358 MD |
273 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
274 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 275 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 276 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 277 | #undef TRACE_SYSTEM |
141ddf28 | 278 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
279 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
280 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
281 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
282 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 283 | #undef TP_PROBE_CB |
3bc29f0a MD |
284 | #undef _TRACE_SYSCALLS_INTEGERS_H |
285 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 286 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 287 | |
fc4f7161 | 288 | #undef SC_EXIT |
259b6cb3 | 289 | |
2655f9ad | 290 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
291 | #undef LTTNG_PACKAGE_BUILD |
292 | #undef CREATE_TRACE_POINTS | |
293 | ||
a93244f8 | 294 | struct trace_syscall_entry { |
2d6d88c6 | 295 | void *event_func; |
8a8ac9a8 | 296 | void *event_notifier_func; |
a93244f8 MD |
297 | const struct lttng_event_desc *desc; |
298 | const struct lttng_event_field *fields; | |
299 | unsigned int nrargs; | |
300 | }; | |
301 | ||
302 | #define CREATE_SYSCALL_TABLE | |
303 | ||
fc4f7161 MD |
304 | #define SC_ENTER |
305 | ||
306 | #undef sc_exit | |
307 | #define sc_exit(...) | |
308 | ||
259b6cb3 | 309 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 310 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 311 | [ _nr ] = { \ |
2d6d88c6 | 312 | .event_func = __event_probe__syscall_entry_##_template, \ |
8a8ac9a8 | 313 | .event_notifier_func = __event_notifier_probe__syscall_entry_##_template, \ |
259b6cb3 | 314 | .nrargs = (_nrargs), \ |
d4291869 MD |
315 | .fields = __event_fields___syscall_entry_##_template, \ |
316 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
317 | }, |
318 | ||
2d6d88c6 | 319 | /* Event syscall enter tracing table */ |
49c50022 | 320 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
321 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
322 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
323 | }; |
324 | ||
a93244f8 MD |
325 | #undef TRACE_SYSCALL_TABLE |
326 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
327 | [ _nr ] = { \ | |
2d6d88c6 | 328 | .event_func = __event_probe__compat_syscall_entry_##_template, \ |
8a8ac9a8 | 329 | .event_notifier_func = __event_notifier_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 330 | .nrargs = (_nrargs), \ |
d4291869 MD |
331 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
332 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
333 | }, |
334 | ||
2d6d88c6 | 335 | /* Event compat syscall enter table */ |
a93244f8 | 336 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
337 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
338 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 339 | }; |
259b6cb3 | 340 | |
fc4f7161 MD |
341 | #undef SC_ENTER |
342 | ||
343 | #define SC_EXIT | |
344 | ||
345 | #undef sc_exit | |
346 | #define sc_exit(...) __VA_ARGS__ | |
347 | ||
5b7ac358 MD |
348 | #undef TRACE_SYSCALL_TABLE |
349 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
350 | [ _nr ] = { \ | |
2d6d88c6 | 351 | .event_func = __event_probe__syscall_exit_##_template, \ |
8a8ac9a8 | 352 | .event_notifier_func = __event_notifier_probe__syscall_exit_##_template, \ |
5b7ac358 MD |
353 | .nrargs = (_nrargs), \ |
354 | .fields = __event_fields___syscall_exit_##_template, \ | |
355 | .desc = &__event_desc___syscall_exit_##_name, \ | |
356 | }, | |
357 | ||
2d6d88c6 | 358 | /* Event syscall exit table */ |
5b7ac358 | 359 | static const struct trace_syscall_entry sc_exit_table[] = { |
241ae9a8 MD |
360 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
361 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
362 | }; |
363 | ||
364 | #undef TRACE_SYSCALL_TABLE | |
365 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
366 | [ _nr ] = { \ | |
2d6d88c6 | 367 | .event_func = __event_probe__compat_syscall_exit_##_template, \ |
8a8ac9a8 | 368 | .event_notifier_func = __event_notifier_probe__compat_syscall_exit_##_template, \ |
5b7ac358 MD |
369 | .nrargs = (_nrargs), \ |
370 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
371 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
372 | }, | |
373 | ||
2d6d88c6 | 374 | /* Event compat syscall exit table */ |
5b7ac358 | 375 | const struct trace_syscall_entry compat_sc_exit_table[] = { |
241ae9a8 MD |
376 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
377 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
378 | }; |
379 | ||
fc4f7161 MD |
380 | #undef SC_EXIT |
381 | ||
a93244f8 | 382 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 383 | |
80f87dd2 | 384 | struct lttng_syscall_filter { |
badfe9f5 MD |
385 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
386 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
387 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
388 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
389 | }; |
390 | ||
3b82c4e1 | 391 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 392 | struct pt_regs *regs, long id) |
f405cfce | 393 | { |
1b7b9c65 | 394 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
3b82c4e1 | 395 | struct lttng_event *event; |
f405cfce | 396 | |
1b7b9c65 | 397 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 398 | lttng_hlist_for_each_entry_rcu(event, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 MD |
399 | if (unlikely(in_compat_syscall())) |
400 | __event_probe__compat_syscall_entry_unknown(event, id, args); | |
401 | else | |
402 | __event_probe__syscall_entry_unknown(event, id, args); | |
403 | } | |
f405cfce MD |
404 | } |
405 | ||
8a8ac9a8 FD |
406 | static void syscall_entry_event_notifier_unknown( |
407 | struct hlist_head *unknown_dispatch_list_head, | |
408 | struct pt_regs *regs, long id) | |
409 | { | |
410 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
411 | struct lttng_event_notifier *notifier; | |
412 | ||
413 | lttng_syscall_get_arguments(current, regs, args); | |
414 | lttng_hlist_for_each_entry_rcu(notifier, unknown_dispatch_list_head, u.syscall.node) { | |
415 | if (unlikely(in_compat_syscall())) | |
416 | __event_notifier_probe__compat_syscall_entry_unknown(notifier, id, args); | |
417 | else | |
418 | __event_notifier_probe__syscall_entry_unknown(notifier, id, args); | |
419 | } | |
420 | } | |
421 | ||
422 | static void syscall_exit_event_notifier_unknown( | |
423 | struct hlist_head *unknown_dispatch_list_head, | |
424 | struct pt_regs *regs, long id, long ret) | |
425 | { | |
426 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
427 | struct lttng_event_notifier *notifier; | |
428 | ||
429 | lttng_syscall_get_arguments(current, regs, args); | |
430 | lttng_hlist_for_each_entry_rcu(notifier, unknown_dispatch_list_head, u.syscall.node) { | |
431 | if (unlikely(in_compat_syscall())) | |
432 | __event_notifier_probe__compat_syscall_exit_unknown(notifier, id, ret, args); | |
433 | else | |
434 | __event_notifier_probe__syscall_exit_unknown(notifier, id, ret, args); | |
435 | } | |
436 | } | |
437 | ||
63aa9160 | 438 | static __always_inline |
3b82c4e1 MD |
439 | void syscall_entry_call_func(struct hlist_head *action_list, |
440 | void *func, unsigned int nrargs, | |
63aa9160 | 441 | struct pt_regs *regs) |
259b6cb3 | 442 | { |
3b82c4e1 MD |
443 | struct lttng_event *event; |
444 | ||
63aa9160 | 445 | switch (nrargs) { |
259b6cb3 MD |
446 | case 0: |
447 | { | |
63aa9160 | 448 | void (*fptr)(void *__data) = func; |
259b6cb3 | 449 | |
9b4791f7 | 450 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 451 | fptr(event); |
259b6cb3 MD |
452 | break; |
453 | } | |
454 | case 1: | |
455 | { | |
63aa9160 | 456 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 457 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 458 | |
1b7b9c65 | 459 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 460 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 461 | fptr(event, args[0]); |
259b6cb3 MD |
462 | break; |
463 | } | |
464 | case 2: | |
465 | { | |
466 | void (*fptr)(void *__data, | |
467 | unsigned long arg0, | |
63aa9160 | 468 | unsigned long arg1) = func; |
1b7b9c65 | 469 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 470 | |
1b7b9c65 | 471 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 472 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 473 | fptr(event, args[0], args[1]); |
259b6cb3 MD |
474 | break; |
475 | } | |
476 | case 3: | |
477 | { | |
478 | void (*fptr)(void *__data, | |
479 | unsigned long arg0, | |
480 | unsigned long arg1, | |
63aa9160 | 481 | unsigned long arg2) = func; |
1b7b9c65 | 482 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 483 | |
1b7b9c65 | 484 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 485 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 486 | fptr(event, args[0], args[1], args[2]); |
259b6cb3 MD |
487 | break; |
488 | } | |
489 | case 4: | |
490 | { | |
491 | void (*fptr)(void *__data, | |
492 | unsigned long arg0, | |
493 | unsigned long arg1, | |
494 | unsigned long arg2, | |
63aa9160 | 495 | unsigned long arg3) = func; |
1b7b9c65 | 496 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 497 | |
1b7b9c65 | 498 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 499 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 500 | fptr(event, args[0], args[1], args[2], args[3]); |
259b6cb3 MD |
501 | break; |
502 | } | |
503 | case 5: | |
504 | { | |
505 | void (*fptr)(void *__data, | |
506 | unsigned long arg0, | |
507 | unsigned long arg1, | |
508 | unsigned long arg2, | |
509 | unsigned long arg3, | |
63aa9160 | 510 | unsigned long arg4) = func; |
1b7b9c65 | 511 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 512 | |
1b7b9c65 | 513 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 514 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 515 | fptr(event, args[0], args[1], args[2], args[3], args[4]); |
259b6cb3 MD |
516 | break; |
517 | } | |
518 | case 6: | |
519 | { | |
520 | void (*fptr)(void *__data, | |
521 | unsigned long arg0, | |
522 | unsigned long arg1, | |
523 | unsigned long arg2, | |
524 | unsigned long arg3, | |
525 | unsigned long arg4, | |
63aa9160 | 526 | unsigned long arg5) = func; |
1b7b9c65 | 527 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 528 | |
1b7b9c65 | 529 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 530 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 MD |
531 | fptr(event, args[0], args[1], args[2], |
532 | args[3], args[4], args[5]); | |
259b6cb3 MD |
533 | break; |
534 | } | |
535 | default: | |
536 | break; | |
537 | } | |
538 | } | |
539 | ||
8a8ac9a8 FD |
540 | static __always_inline |
541 | void syscall_entry_event_notifier_call_func(struct hlist_head *dispatch_list, | |
542 | void *func, unsigned int nrargs, struct pt_regs *regs) | |
543 | { | |
544 | struct lttng_event_notifier *notifier; | |
545 | ||
546 | switch (nrargs) { | |
547 | case 0: | |
548 | { | |
549 | void (*fptr)(void *__data) = func; | |
550 | ||
551 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
552 | fptr(notifier); | |
553 | break; | |
554 | } | |
555 | case 1: | |
556 | { | |
557 | void (*fptr)(void *__data, unsigned long arg0) = func; | |
558 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
559 | ||
560 | lttng_syscall_get_arguments(current, regs, args); | |
561 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
562 | fptr(notifier, args[0]); | |
563 | break; | |
564 | } | |
565 | case 2: | |
566 | { | |
567 | void (*fptr)(void *__data, | |
568 | unsigned long arg0, | |
569 | unsigned long arg1) = func; | |
570 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
571 | ||
572 | lttng_syscall_get_arguments(current, regs, args); | |
573 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
574 | fptr(notifier, args[0], args[1]); | |
575 | break; | |
576 | } | |
577 | case 3: | |
578 | { | |
579 | void (*fptr)(void *__data, | |
580 | unsigned long arg0, | |
581 | unsigned long arg1, | |
582 | unsigned long arg2) = func; | |
583 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
584 | ||
585 | lttng_syscall_get_arguments(current, regs, args); | |
586 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
587 | fptr(notifier, args[0], args[1], args[2]); | |
588 | break; | |
589 | } | |
590 | case 4: | |
591 | { | |
592 | void (*fptr)(void *__data, | |
593 | unsigned long arg0, | |
594 | unsigned long arg1, | |
595 | unsigned long arg2, | |
596 | unsigned long arg3) = func; | |
597 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
598 | ||
599 | lttng_syscall_get_arguments(current, regs, args); | |
600 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
601 | fptr(notifier, args[0], args[1], args[2], args[3]); | |
602 | break; | |
603 | } | |
604 | case 5: | |
605 | { | |
606 | void (*fptr)(void *__data, | |
607 | unsigned long arg0, | |
608 | unsigned long arg1, | |
609 | unsigned long arg2, | |
610 | unsigned long arg3, | |
611 | unsigned long arg4) = func; | |
612 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
613 | ||
614 | lttng_syscall_get_arguments(current, regs, args); | |
615 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
616 | fptr(notifier, args[0], args[1], args[2], args[3], args[4]); | |
617 | break; | |
618 | } | |
619 | case 6: | |
620 | { | |
621 | void (*fptr)(void *__data, | |
622 | unsigned long arg0, | |
623 | unsigned long arg1, | |
624 | unsigned long arg2, | |
625 | unsigned long arg3, | |
626 | unsigned long arg4, | |
627 | unsigned long arg5) = func; | |
628 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
629 | ||
630 | lttng_syscall_get_arguments(current, regs, args); | |
631 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
632 | fptr(notifier, args[0], args[1], args[2], args[3], args[4], args[5]); | |
633 | break; | |
634 | } | |
635 | default: | |
636 | break; | |
637 | } | |
638 | } | |
639 | ||
63aa9160 FD |
640 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
641 | { | |
642 | struct lttng_channel *chan = __data; | |
3b82c4e1 | 643 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
644 | const struct trace_syscall_entry *table, *entry; |
645 | size_t table_len; | |
646 | ||
647 | if (unlikely(in_compat_syscall())) { | |
648 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
649 | ||
650 | if (id < 0 || id >= NR_compat_syscalls | |
3b82c4e1 | 651 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
652 | /* System call filtered out. */ |
653 | return; | |
654 | } | |
655 | table = compat_sc_table; | |
656 | table_len = ARRAY_SIZE(compat_sc_table); | |
3b82c4e1 | 657 | unknown_action_list = &chan->sc_compat_unknown; |
63aa9160 FD |
658 | } else { |
659 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
660 | ||
661 | if (id < 0 || id >= NR_syscalls | |
3b82c4e1 | 662 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
663 | /* System call filtered out. */ |
664 | return; | |
665 | } | |
666 | table = sc_table; | |
667 | table_len = ARRAY_SIZE(sc_table); | |
3b82c4e1 | 668 | unknown_action_list = &chan->sc_unknown; |
63aa9160 FD |
669 | } |
670 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 671 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
672 | return; |
673 | } | |
3b82c4e1 MD |
674 | |
675 | entry = &table[id]; | |
676 | if (!entry->event_func) { | |
677 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
678 | return; |
679 | } | |
3b82c4e1 MD |
680 | |
681 | if (unlikely(in_compat_syscall())) { | |
682 | action_list = &chan->compat_sc_table[id]; | |
683 | } else { | |
684 | action_list = &chan->sc_table[id]; | |
685 | } | |
686 | if (unlikely(hlist_empty(action_list))) | |
687 | return; | |
688 | ||
689 | syscall_entry_call_func(action_list, entry->event_func, entry->nrargs, regs); | |
63aa9160 FD |
690 | } |
691 | ||
8a8ac9a8 FD |
692 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
693 | long id) | |
694 | { | |
695 | struct lttng_event_notifier_group *group = __data; | |
696 | const struct trace_syscall_entry *table, *entry; | |
697 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
698 | size_t table_len; | |
699 | ||
700 | if (unlikely(in_compat_syscall())) { | |
701 | struct lttng_syscall_filter *filter = group->sc_filter; | |
702 | ||
703 | if (id < 0 || id >= NR_compat_syscalls | |
704 | || (!READ_ONCE(group->syscall_all_entry) && | |
705 | !test_bit(id, filter->sc_compat_entry))) { | |
706 | /* System call filtered out. */ | |
707 | return; | |
708 | } | |
709 | table = compat_sc_table; | |
710 | table_len = ARRAY_SIZE(compat_sc_table); | |
711 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
712 | } else { | |
713 | struct lttng_syscall_filter *filter = group->sc_filter; | |
714 | ||
715 | if (id < 0 || id >= NR_syscalls | |
716 | || (!READ_ONCE(group->syscall_all_entry) && | |
717 | !test_bit(id, filter->sc_entry))) { | |
718 | /* System call filtered out. */ | |
719 | return; | |
720 | } | |
721 | table = sc_table; | |
722 | table_len = ARRAY_SIZE(sc_table); | |
723 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
724 | } | |
725 | /* Check if the syscall id is out of bound. */ | |
726 | if (unlikely(id < 0 || id >= table_len)) { | |
727 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
728 | regs, id); | |
729 | return; | |
730 | } | |
731 | ||
732 | entry = &table[id]; | |
733 | if (!entry->event_notifier_func) { | |
734 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
735 | regs, id); | |
736 | return; | |
737 | } | |
738 | ||
739 | if (unlikely(in_compat_syscall())) { | |
740 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
741 | } else { | |
742 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
743 | } | |
744 | if (unlikely(hlist_empty(dispatch_list))) | |
745 | return; | |
746 | ||
747 | syscall_entry_event_notifier_call_func(dispatch_list, | |
748 | entry->event_notifier_func, entry->nrargs, regs); | |
749 | } | |
750 | ||
3b82c4e1 | 751 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 752 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 753 | { |
1b7b9c65 | 754 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
3b82c4e1 | 755 | struct lttng_event *event; |
5b7ac358 | 756 | |
1b7b9c65 | 757 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 758 | lttng_hlist_for_each_entry_rcu(event, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 MD |
759 | if (unlikely(in_compat_syscall())) |
760 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
761 | args); | |
762 | else | |
763 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
764 | } | |
5b7ac358 MD |
765 | } |
766 | ||
3b82c4e1 MD |
767 | static __always_inline |
768 | void syscall_exit_call_func(struct hlist_head *action_list, | |
769 | void *func, unsigned int nrargs, | |
770 | struct pt_regs *regs, long ret) | |
5b7ac358 | 771 | { |
3b82c4e1 | 772 | struct lttng_event *event; |
badfe9f5 | 773 | |
3b82c4e1 | 774 | switch (nrargs) { |
5b7ac358 MD |
775 | case 0: |
776 | { | |
3b82c4e1 | 777 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 778 | |
9b4791f7 | 779 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 780 | fptr(event, ret); |
5b7ac358 MD |
781 | break; |
782 | } | |
783 | case 1: | |
784 | { | |
785 | void (*fptr)(void *__data, | |
fc4f7161 | 786 | long ret, |
3b82c4e1 | 787 | unsigned long arg0) = func; |
1b7b9c65 | 788 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 789 | |
1b7b9c65 | 790 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 791 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 792 | fptr(event, ret, args[0]); |
5b7ac358 MD |
793 | break; |
794 | } | |
795 | case 2: | |
796 | { | |
797 | void (*fptr)(void *__data, | |
fc4f7161 | 798 | long ret, |
5b7ac358 | 799 | unsigned long arg0, |
3b82c4e1 | 800 | unsigned long arg1) = func; |
1b7b9c65 | 801 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 802 | |
1b7b9c65 | 803 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 804 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 805 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
806 | break; |
807 | } | |
808 | case 3: | |
809 | { | |
810 | void (*fptr)(void *__data, | |
fc4f7161 | 811 | long ret, |
5b7ac358 MD |
812 | unsigned long arg0, |
813 | unsigned long arg1, | |
3b82c4e1 | 814 | unsigned long arg2) = func; |
1b7b9c65 | 815 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 816 | |
1b7b9c65 | 817 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 818 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 819 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
820 | break; |
821 | } | |
822 | case 4: | |
823 | { | |
824 | void (*fptr)(void *__data, | |
fc4f7161 | 825 | long ret, |
5b7ac358 MD |
826 | unsigned long arg0, |
827 | unsigned long arg1, | |
828 | unsigned long arg2, | |
3b82c4e1 | 829 | unsigned long arg3) = func; |
1b7b9c65 | 830 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 831 | |
1b7b9c65 | 832 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 833 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 834 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
835 | break; |
836 | } | |
837 | case 5: | |
838 | { | |
839 | void (*fptr)(void *__data, | |
fc4f7161 | 840 | long ret, |
5b7ac358 MD |
841 | unsigned long arg0, |
842 | unsigned long arg1, | |
843 | unsigned long arg2, | |
844 | unsigned long arg3, | |
3b82c4e1 | 845 | unsigned long arg4) = func; |
1b7b9c65 | 846 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 847 | |
1b7b9c65 | 848 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 849 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 | 850 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
851 | break; |
852 | } | |
853 | case 6: | |
854 | { | |
855 | void (*fptr)(void *__data, | |
fc4f7161 | 856 | long ret, |
5b7ac358 MD |
857 | unsigned long arg0, |
858 | unsigned long arg1, | |
859 | unsigned long arg2, | |
860 | unsigned long arg3, | |
861 | unsigned long arg4, | |
3b82c4e1 | 862 | unsigned long arg5) = func; |
1b7b9c65 | 863 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 864 | |
1b7b9c65 | 865 | lttng_syscall_get_arguments(current, regs, args); |
9b4791f7 | 866 | lttng_hlist_for_each_entry_rcu(event, action_list, u.syscall.node) |
3b82c4e1 MD |
867 | fptr(event, ret, args[0], args[1], args[2], |
868 | args[3], args[4], args[5]); | |
5b7ac358 MD |
869 | break; |
870 | } | |
871 | default: | |
872 | break; | |
873 | } | |
874 | } | |
875 | ||
3b82c4e1 MD |
876 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
877 | { | |
878 | struct lttng_channel *chan = __data; | |
879 | struct hlist_head *action_list, *unknown_action_list; | |
880 | const struct trace_syscall_entry *table, *entry; | |
881 | size_t table_len; | |
882 | long id; | |
883 | ||
884 | id = syscall_get_nr(current, regs); | |
885 | ||
886 | if (unlikely(in_compat_syscall())) { | |
887 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
888 | ||
889 | if (id < 0 || id >= NR_compat_syscalls | |
890 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { | |
891 | /* System call filtered out. */ | |
892 | return; | |
893 | } | |
894 | table = compat_sc_exit_table; | |
895 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
896 | unknown_action_list = &chan->compat_sc_exit_unknown; | |
897 | } else { | |
898 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
899 | ||
900 | if (id < 0 || id >= NR_syscalls | |
901 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { | |
902 | /* System call filtered out. */ | |
903 | return; | |
904 | } | |
905 | table = sc_exit_table; | |
906 | table_len = ARRAY_SIZE(sc_exit_table); | |
907 | unknown_action_list = &chan->sc_exit_unknown; | |
908 | } | |
909 | if (unlikely(id < 0 || id >= table_len)) { | |
910 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
911 | return; | |
912 | } | |
913 | ||
914 | entry = &table[id]; | |
915 | if (!entry->event_func) { | |
916 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
917 | return; | |
918 | } | |
919 | ||
920 | if (unlikely(in_compat_syscall())) { | |
921 | action_list = &chan->compat_sc_exit_table[id]; | |
922 | } else { | |
923 | action_list = &chan->sc_exit_table[id]; | |
924 | } | |
925 | if (unlikely(hlist_empty(action_list))) | |
926 | return; | |
927 | ||
928 | syscall_exit_call_func(action_list, entry->event_func, entry->nrargs, | |
929 | regs, ret); | |
930 | } | |
931 | ||
8a8ac9a8 FD |
932 | static __always_inline |
933 | void syscall_exit_event_notifier_call_func(struct hlist_head *dispatch_list, | |
934 | void *func, unsigned int nrargs, struct pt_regs *regs, long ret) | |
935 | { | |
936 | struct lttng_event_notifier *notifier; | |
937 | ||
938 | switch (nrargs) { | |
939 | case 0: | |
940 | { | |
941 | void (*fptr)(void *__data, long ret) = func; | |
942 | ||
943 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
944 | fptr(notifier, ret); | |
945 | break; | |
946 | } | |
947 | case 1: | |
948 | { | |
949 | void (*fptr)(void *__data, long ret, unsigned long arg0) = func; | |
950 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
951 | ||
952 | lttng_syscall_get_arguments(current, regs, args); | |
953 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
954 | fptr(notifier, ret, args[0]); | |
955 | break; | |
956 | } | |
957 | case 2: | |
958 | { | |
959 | void (*fptr)(void *__data, | |
960 | long ret, | |
961 | unsigned long arg0, | |
962 | unsigned long arg1) = func; | |
963 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
964 | ||
965 | lttng_syscall_get_arguments(current, regs, args); | |
966 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
967 | fptr(notifier, ret, args[0], args[1]); | |
968 | break; | |
969 | } | |
970 | case 3: | |
971 | { | |
972 | void (*fptr)(void *__data, | |
973 | long ret, | |
974 | unsigned long arg0, | |
975 | unsigned long arg1, | |
976 | unsigned long arg2) = func; | |
977 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
978 | ||
979 | lttng_syscall_get_arguments(current, regs, args); | |
980 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
981 | fptr(notifier, ret, args[0], args[1], args[2]); | |
982 | break; | |
983 | } | |
984 | case 4: | |
985 | { | |
986 | void (*fptr)(void *__data, | |
987 | long ret, | |
988 | unsigned long arg0, | |
989 | unsigned long arg1, | |
990 | unsigned long arg2, | |
991 | unsigned long arg3) = func; | |
992 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
993 | ||
994 | lttng_syscall_get_arguments(current, regs, args); | |
995 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
996 | fptr(notifier, ret, args[0], args[1], args[2], args[3]); | |
997 | break; | |
998 | } | |
999 | case 5: | |
1000 | { | |
1001 | void (*fptr)(void *__data, | |
1002 | long ret, | |
1003 | unsigned long arg0, | |
1004 | unsigned long arg1, | |
1005 | unsigned long arg2, | |
1006 | unsigned long arg3, | |
1007 | unsigned long arg4) = func; | |
1008 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
1009 | ||
1010 | lttng_syscall_get_arguments(current, regs, args); | |
1011 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
1012 | fptr(notifier, ret, args[0], args[1], args[2], args[3], args[4]); | |
1013 | break; | |
1014 | } | |
1015 | case 6: | |
1016 | { | |
1017 | void (*fptr)(void *__data, | |
1018 | long ret, | |
1019 | unsigned long arg0, | |
1020 | unsigned long arg1, | |
1021 | unsigned long arg2, | |
1022 | unsigned long arg3, | |
1023 | unsigned long arg4, | |
1024 | unsigned long arg5) = func; | |
1025 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
1026 | ||
1027 | lttng_syscall_get_arguments(current, regs, args); | |
1028 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
1029 | fptr(notifier, ret, args[0], args[1], args[2], args[3], args[4], args[5]); | |
1030 | break; | |
1031 | } | |
1032 | default: | |
1033 | break; | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | static | |
1038 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
1039 | long ret) | |
1040 | { | |
1041 | struct lttng_event_notifier_group *group = __data; | |
1042 | const struct trace_syscall_entry *table, *entry; | |
1043 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
1044 | size_t table_len; | |
1045 | long id; | |
1046 | ||
1047 | id = syscall_get_nr(current, regs); | |
1048 | ||
1049 | if (unlikely(in_compat_syscall())) { | |
1050 | struct lttng_syscall_filter *filter = group->sc_filter; | |
1051 | ||
1052 | if (id < 0 || id >= NR_compat_syscalls | |
1053 | || (!READ_ONCE(group->syscall_all_exit) && | |
1054 | !test_bit(id, filter->sc_compat_exit))) { | |
1055 | /* System call filtered out. */ | |
1056 | return; | |
1057 | } | |
1058 | table = compat_sc_exit_table; | |
1059 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
1060 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
1061 | } else { | |
1062 | struct lttng_syscall_filter *filter = group->sc_filter; | |
1063 | ||
1064 | if (id < 0 || id >= NR_syscalls | |
1065 | || (!READ_ONCE(group->syscall_all_exit) && | |
1066 | !test_bit(id, filter->sc_exit))) { | |
1067 | /* System call filtered out. */ | |
1068 | return; | |
1069 | } | |
1070 | table = sc_exit_table; | |
1071 | table_len = ARRAY_SIZE(sc_exit_table); | |
1072 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
1073 | } | |
1074 | /* Check if the syscall id is out of bound. */ | |
1075 | if (unlikely(id < 0 || id >= table_len)) { | |
1076 | syscall_exit_event_notifier_unknown(unknown_dispatch_list, | |
1077 | regs, id, ret); | |
1078 | return; | |
1079 | } | |
1080 | ||
1081 | entry = &table[id]; | |
1082 | if (!entry->event_notifier_func) { | |
1083 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
1084 | regs, id); | |
1085 | return; | |
1086 | } | |
1087 | ||
1088 | if (unlikely(in_compat_syscall())) { | |
1089 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
1090 | } else { | |
1091 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
1092 | } | |
1093 | if (unlikely(hlist_empty(dispatch_list))) | |
1094 | return; | |
1095 | ||
1096 | syscall_exit_event_notifier_call_func(dispatch_list, | |
1097 | entry->event_notifier_func, entry->nrargs, regs, ret); | |
1098 | } | |
33a39a3c MD |
1099 | /* |
1100 | * noinline to diminish caller stack size. | |
1101 | * Should be called with sessions lock held. | |
1102 | */ | |
49c50022 | 1103 | static |
3b82c4e1 MD |
1104 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
1105 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
5b7ac358 | 1106 | void *filter, enum sc_type type) |
259b6cb3 | 1107 | { |
3b82c4e1 MD |
1108 | struct lttng_channel *chan = event_enabler->chan; |
1109 | struct lttng_session *session = chan->session; | |
259b6cb3 | 1110 | unsigned int i; |
49c50022 | 1111 | |
3b82c4e1 | 1112 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 1113 | for (i = 0; i < table_len; i++) { |
3b82c4e1 | 1114 | const struct lttng_event_desc *desc = table[i].desc; |
49c50022 | 1115 | struct lttng_kernel_event ev; |
3b82c4e1 MD |
1116 | struct lttng_event *event; |
1117 | struct hlist_head *head; | |
1118 | bool found = false; | |
49c50022 MD |
1119 | |
1120 | if (!desc) { | |
1121 | /* Unknown syscall */ | |
1122 | continue; | |
1123 | } | |
3b82c4e1 MD |
1124 | if (lttng_desc_match_enabler(desc, |
1125 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
1126 | continue; | |
49c50022 | 1127 | /* |
3b82c4e1 | 1128 | * Check if already created. |
49c50022 | 1129 | */ |
3b82c4e1 MD |
1130 | head = utils_borrow_hash_table_bucket( |
1131 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
1132 | desc->name); | |
1133 | lttng_hlist_for_each_entry(event, head, hlist) { | |
1134 | if (event->desc == desc | |
1135 | && event->chan == event_enabler->chan) | |
1136 | found = true; | |
1137 | } | |
1138 | if (found) | |
49c50022 | 1139 | continue; |
3b82c4e1 MD |
1140 | |
1141 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 1142 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
1143 | switch (type) { |
1144 | case SC_TYPE_ENTRY: | |
badfe9f5 MD |
1145 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
1146 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
1147 | break; |
1148 | case SC_TYPE_EXIT: | |
badfe9f5 MD |
1149 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
1150 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
1151 | break; |
1152 | case SC_TYPE_COMPAT_ENTRY: | |
badfe9f5 MD |
1153 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
1154 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
1155 | break; |
1156 | case SC_TYPE_COMPAT_EXIT: | |
badfe9f5 MD |
1157 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
1158 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
1159 | break; |
1160 | } | |
092ffe97 | 1161 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN - 1); |
f8695253 | 1162 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c | 1163 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
3b82c4e1 MD |
1164 | event = _lttng_event_create(chan, &ev, filter, |
1165 | desc, ev.instrumentation); | |
1166 | WARN_ON_ONCE(!event); | |
1167 | if (IS_ERR(event)) { | |
49c50022 MD |
1168 | /* |
1169 | * If something goes wrong in event registration | |
1170 | * after the first one, we have no choice but to | |
1171 | * leave the previous events in there, until | |
1172 | * deleted by session teardown. | |
1173 | */ | |
3b82c4e1 | 1174 | return PTR_ERR(event); |
49c50022 | 1175 | } |
3b82c4e1 | 1176 | hlist_add_head(&event->u.syscall.node, &chan_table[i]); |
49c50022 MD |
1177 | } |
1178 | return 0; | |
1179 | } | |
1180 | ||
33a39a3c MD |
1181 | /* |
1182 | * Should be called with sessions lock held. | |
1183 | */ | |
3b82c4e1 | 1184 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler, void *filter) |
49c50022 | 1185 | { |
3b82c4e1 | 1186 | struct lttng_channel *chan = event_enabler->chan; |
2a0c4816 | 1187 | struct lttng_kernel_event ev; |
259b6cb3 MD |
1188 | int ret; |
1189 | ||
263b6c88 | 1190 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
1191 | |
1192 | if (!chan->sc_table) { | |
1193 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 1194 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
1195 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
1196 | if (!chan->sc_table) | |
1197 | return -ENOMEM; | |
1198 | } | |
5b7ac358 MD |
1199 | if (!chan->sc_exit_table) { |
1200 | /* create syscall table mapping syscall to events */ | |
1201 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
1202 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
1203 | if (!chan->sc_exit_table) | |
1204 | return -ENOMEM; | |
1205 | } | |
1206 | ||
259b6cb3 | 1207 | |
49c50022 MD |
1208 | #ifdef CONFIG_COMPAT |
1209 | if (!chan->compat_sc_table) { | |
1210 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 1211 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 1212 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
1213 | if (!chan->compat_sc_table) |
1214 | return -ENOMEM; | |
1215 | } | |
5b7ac358 MD |
1216 | |
1217 | if (!chan->compat_sc_exit_table) { | |
1218 | /* create syscall table mapping compat syscall to events */ | |
1219 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
1220 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
1221 | if (!chan->compat_sc_exit_table) | |
1222 | return -ENOMEM; | |
1223 | } | |
49c50022 | 1224 | #endif |
3b82c4e1 | 1225 | if (hlist_empty(&chan->sc_unknown)) { |
f405cfce | 1226 | const struct lttng_event_desc *desc = |
d4291869 | 1227 | &__event_desc___syscall_entry_unknown; |
3b82c4e1 | 1228 | struct lttng_event *event; |
2f804c0a | 1229 | |
f405cfce | 1230 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
1231 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
1232 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 1233 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
1234 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
1235 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
3b82c4e1 MD |
1236 | event = _lttng_event_create(chan, &ev, filter, desc, |
1237 | ev.instrumentation); | |
1238 | WARN_ON_ONCE(!event); | |
1239 | if (IS_ERR(event)) { | |
1240 | return PTR_ERR(event); | |
f405cfce | 1241 | } |
3b82c4e1 | 1242 | hlist_add_head(&event->u.syscall.node, &chan->sc_unknown); |
f405cfce MD |
1243 | } |
1244 | ||
3b82c4e1 | 1245 | if (hlist_empty(&chan->sc_compat_unknown)) { |
b76dc1a0 | 1246 | const struct lttng_event_desc *desc = |
d4291869 | 1247 | &__event_desc___compat_syscall_entry_unknown; |
3b82c4e1 | 1248 | struct lttng_event *event; |
b76dc1a0 MD |
1249 | |
1250 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
1251 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
1252 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 1253 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
1254 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
1255 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
3b82c4e1 MD |
1256 | event = _lttng_event_create(chan, &ev, filter, desc, |
1257 | ev.instrumentation); | |
1258 | WARN_ON_ONCE(!event); | |
1259 | if (IS_ERR(event)) { | |
1260 | return PTR_ERR(event); | |
b76dc1a0 | 1261 | } |
3b82c4e1 | 1262 | hlist_add_head(&event->u.syscall.node, &chan->sc_compat_unknown); |
b76dc1a0 MD |
1263 | } |
1264 | ||
3b82c4e1 | 1265 | if (hlist_empty(&chan->compat_sc_exit_unknown)) { |
2f804c0a | 1266 | const struct lttng_event_desc *desc = |
5b7ac358 | 1267 | &__event_desc___compat_syscall_exit_unknown; |
3b82c4e1 | 1268 | struct lttng_event *event; |
2f804c0a MD |
1269 | |
1270 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
1271 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
1272 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 1273 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
1274 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
1275 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
3b82c4e1 MD |
1276 | event = _lttng_event_create(chan, &ev, filter, desc, |
1277 | ev.instrumentation); | |
1278 | WARN_ON_ONCE(!event); | |
1279 | if (IS_ERR(event)) { | |
1280 | return PTR_ERR(event); | |
5b7ac358 | 1281 | } |
3b82c4e1 | 1282 | hlist_add_head(&event->u.syscall.node, &chan->compat_sc_exit_unknown); |
5b7ac358 MD |
1283 | } |
1284 | ||
3b82c4e1 | 1285 | if (hlist_empty(&chan->sc_exit_unknown)) { |
5b7ac358 MD |
1286 | const struct lttng_event_desc *desc = |
1287 | &__event_desc___syscall_exit_unknown; | |
3b82c4e1 | 1288 | struct lttng_event *event; |
5b7ac358 MD |
1289 | |
1290 | memset(&ev, 0, sizeof(ev)); | |
1291 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
1292 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 1293 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
1294 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
1295 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
3b82c4e1 MD |
1296 | event = _lttng_event_create(chan, &ev, filter, desc, |
1297 | ev.instrumentation); | |
1298 | WARN_ON_ONCE(!event); | |
1299 | if (IS_ERR(event)) { | |
1300 | return PTR_ERR(event); | |
2f804c0a | 1301 | } |
3b82c4e1 | 1302 | hlist_add_head(&event->u.syscall.node, &chan->sc_exit_unknown); |
2f804c0a MD |
1303 | } |
1304 | ||
3b82c4e1 MD |
1305 | ret = lttng_create_syscall_event_if_missing(sc_table, ARRAY_SIZE(sc_table), |
1306 | chan->sc_table, event_enabler, filter, SC_TYPE_ENTRY); | |
5b7ac358 MD |
1307 | if (ret) |
1308 | return ret; | |
3b82c4e1 MD |
1309 | ret = lttng_create_syscall_event_if_missing(sc_exit_table, ARRAY_SIZE(sc_exit_table), |
1310 | chan->sc_exit_table, event_enabler, filter, SC_TYPE_EXIT); | |
49c50022 MD |
1311 | if (ret) |
1312 | return ret; | |
5b7ac358 | 1313 | |
49c50022 | 1314 | #ifdef CONFIG_COMPAT |
3b82c4e1 MD |
1315 | ret = lttng_create_syscall_event_if_missing(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
1316 | chan->compat_sc_table, event_enabler, filter, | |
5b7ac358 MD |
1317 | SC_TYPE_COMPAT_ENTRY); |
1318 | if (ret) | |
1319 | return ret; | |
3b82c4e1 MD |
1320 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
1321 | chan->compat_sc_exit_table, event_enabler, filter, | |
5b7ac358 | 1322 | SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
1323 | if (ret) |
1324 | return ret; | |
1325 | #endif | |
badfe9f5 MD |
1326 | |
1327 | if (!chan->sc_filter) { | |
1328 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1329 | GFP_KERNEL); | |
1330 | if (!chan->sc_filter) | |
1331 | return -ENOMEM; | |
1332 | } | |
1333 | ||
80f87dd2 MD |
1334 | if (!chan->sys_enter_registered) { |
1335 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 1336 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1337 | if (ret) |
1338 | return ret; | |
1339 | chan->sys_enter_registered = 1; | |
1340 | } | |
63728b02 MD |
1341 | /* |
1342 | * We change the name of sys_exit tracepoint due to namespace | |
1343 | * conflict with sys_exit syscall entry. | |
1344 | */ | |
80f87dd2 MD |
1345 | if (!chan->sys_exit_registered) { |
1346 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 1347 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1348 | if (ret) { |
1349 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 1350 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
1351 | return ret; |
1352 | } | |
1353 | chan->sys_exit_registered = 1; | |
63728b02 | 1354 | } |
259b6cb3 MD |
1355 | return ret; |
1356 | } | |
1357 | ||
1358 | /* | |
8a8ac9a8 FD |
1359 | * Should be called with sessions lock held. |
1360 | */ | |
1361 | int lttng_syscalls_register_event_notifier( | |
1362 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1363 | void *filter) | |
1364 | { | |
1365 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1366 | unsigned int i; | |
1367 | int ret = 0; | |
1368 | ||
1369 | wrapper_vmalloc_sync_mappings(); | |
1370 | ||
1371 | if (!group->event_notifier_syscall_dispatch) { | |
1372 | group->event_notifier_syscall_dispatch = | |
1373 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1374 | GFP_KERNEL); | |
1375 | if (!group->event_notifier_syscall_dispatch) | |
1376 | return -ENOMEM; | |
1377 | ||
1378 | /* Initialize all list_head */ | |
1379 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1380 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); | |
1381 | ||
1382 | /* Init the unknown syscall notifier list. */ | |
1383 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
1384 | } | |
1385 | ||
1386 | if (!group->event_notifier_exit_syscall_dispatch) { | |
1387 | group->event_notifier_exit_syscall_dispatch = | |
1388 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1389 | GFP_KERNEL); | |
1390 | if (!group->event_notifier_exit_syscall_dispatch) | |
1391 | return -ENOMEM; | |
1392 | ||
1393 | /* Initialize all list_head */ | |
1394 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1395 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); | |
1396 | ||
1397 | /* Init the unknown exit syscall notifier list. */ | |
1398 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
1399 | } | |
1400 | ||
1401 | #ifdef CONFIG_COMPAT | |
1402 | if (!group->event_notifier_compat_syscall_dispatch) { | |
1403 | group->event_notifier_compat_syscall_dispatch = | |
1404 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_table), | |
1405 | GFP_KERNEL); | |
1406 | if (!group->event_notifier_syscall_dispatch) | |
1407 | return -ENOMEM; | |
1408 | ||
1409 | /* Initialize all list_head */ | |
1410 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) | |
1411 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); | |
1412 | ||
1413 | /* Init the unknown syscall notifier list. */ | |
1414 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
1415 | } | |
1416 | ||
1417 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
1418 | group->event_notifier_exit_compat_syscall_dispatch = | |
1419 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_exit_table), | |
1420 | GFP_KERNEL); | |
1421 | if (!group->event_notifier_exit_syscall_dispatch) | |
1422 | return -ENOMEM; | |
1423 | ||
1424 | /* Initialize all list_head */ | |
1425 | for (i = 0; i < ARRAY_SIZE(compat_sc_exit_table); i++) | |
1426 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); | |
1427 | ||
1428 | /* Init the unknown exit syscall notifier list. */ | |
1429 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
1430 | } | |
1431 | #endif | |
1432 | ||
1433 | if (!group->sc_filter) { | |
1434 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1435 | GFP_KERNEL); | |
1436 | if (!group->sc_filter) | |
1437 | return -ENOMEM; | |
1438 | } | |
1439 | ||
1440 | if (!group->sys_enter_registered) { | |
1441 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
1442 | (void *) syscall_entry_event_notifier_probe, group); | |
1443 | if (ret) | |
1444 | return ret; | |
1445 | group->sys_enter_registered = 1; | |
1446 | } | |
1447 | ||
1448 | if (!group->sys_exit_registered) { | |
1449 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
1450 | (void *) syscall_exit_event_notifier_probe, group); | |
1451 | if (ret) { | |
1452 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1453 | (void *) syscall_entry_event_notifier_probe, group)); | |
1454 | return ret; | |
1455 | } | |
1456 | group->sys_exit_registered = 1; | |
1457 | } | |
1458 | ||
1459 | return ret; | |
1460 | } | |
1461 | ||
1462 | static | |
1463 | int create_unknown_event_notifier( | |
1464 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1465 | enum sc_type type) | |
1466 | { | |
1467 | struct lttng_event_notifier *notifier; | |
1468 | const struct lttng_event_desc *desc; | |
1469 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1470 | struct lttng_kernel_event_notifier event_notifier_param; | |
1471 | uint64_t user_token = event_notifier_enabler->base.user_token; | |
99f52fcc | 1472 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1473 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
1474 | event_notifier_enabler); | |
1475 | struct hlist_head *unknown_dispatch_list; | |
1476 | int ret = 0; | |
1477 | bool found = false; | |
1478 | enum lttng_kernel_syscall_abi abi; | |
1479 | enum lttng_kernel_syscall_entryexit entryexit; | |
1480 | struct hlist_head *head; | |
1481 | ||
1482 | switch (type) { | |
1483 | case SC_TYPE_ENTRY: | |
1484 | desc = &__event_desc___syscall_entry_unknown; | |
1485 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
1486 | entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; | |
1487 | abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
1488 | break; | |
1489 | case SC_TYPE_EXIT: | |
1490 | desc = &__event_desc___syscall_exit_unknown; | |
1491 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
1492 | entryexit = LTTNG_KERNEL_SYSCALL_EXIT; | |
1493 | abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
1494 | break; | |
1495 | case SC_TYPE_COMPAT_ENTRY: | |
1496 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1497 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
1498 | entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; | |
1499 | abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
1500 | break; | |
1501 | case SC_TYPE_COMPAT_EXIT: | |
1502 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1503 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
1504 | entryexit = LTTNG_KERNEL_SYSCALL_EXIT; | |
1505 | abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
1506 | break; | |
1507 | default: | |
1508 | BUG_ON(1); | |
1509 | } | |
1510 | ||
1511 | /* | |
1512 | * Check if already created. | |
1513 | */ | |
1514 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
1515 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1516 | lttng_hlist_for_each_entry(notifier, head, hlist) { | |
1517 | if (notifier->desc == desc && | |
1518 | notifier->user_token == base_enabler->user_token) | |
1519 | found = true; | |
1520 | } | |
1521 | if (found) | |
1522 | goto end; | |
1523 | ||
1524 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1525 | strncat(event_notifier_param.event.name, desc->name, | |
1526 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
1527 | ||
1528 | event_notifier_param.event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1529 | ||
1530 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
1531 | event_notifier_param.event.u.syscall.abi = abi; | |
1532 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1533 | ||
1534 | notifier = _lttng_event_notifier_create(desc, user_token, | |
99f52fcc | 1535 | error_counter_index, group, &event_notifier_param, NULL, |
8a8ac9a8 FD |
1536 | event_notifier_param.event.instrumentation); |
1537 | if (IS_ERR(notifier)) { | |
1538 | printk(KERN_INFO "Unable to create unknown notifier %s\n", | |
1539 | desc->name); | |
1540 | ret = -ENOMEM; | |
1541 | goto end; | |
1542 | } | |
1543 | ||
1544 | hlist_add_head_rcu(¬ifier->u.syscall.node, unknown_dispatch_list); | |
1545 | ||
1546 | end: | |
1547 | return ret; | |
1548 | } | |
1549 | ||
1550 | static int create_matching_event_notifiers( | |
1551 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1552 | void *filter, const struct trace_syscall_entry *table, | |
1553 | size_t table_len, enum sc_type type) | |
1554 | { | |
1555 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1556 | const struct lttng_event_desc *desc; | |
1557 | uint64_t user_token = event_notifier_enabler->base.user_token; | |
99f52fcc | 1558 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1559 | unsigned int i; |
1560 | int ret = 0; | |
1561 | ||
1562 | /* iterate over all syscall and create event_notifier that match */ | |
1563 | for (i = 0; i < table_len; i++) { | |
1564 | struct lttng_event_notifier *event_notifier; | |
1565 | struct lttng_kernel_event_notifier event_notifier_param; | |
1566 | struct hlist_head *head; | |
1567 | int found = 0; | |
1568 | ||
1569 | desc = table[i].desc; | |
1570 | if (!desc) { | |
1571 | /* Unknown syscall */ | |
1572 | continue; | |
1573 | } | |
1574 | ||
1575 | if (!lttng_desc_match_enabler(desc, | |
1576 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1577 | continue; | |
1578 | ||
1579 | /* | |
1580 | * Check if already created. | |
1581 | */ | |
1582 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
1583 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1584 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1585 | if (event_notifier->desc == desc | |
1586 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1587 | found = 1; | |
1588 | } | |
1589 | if (found) | |
1590 | continue; | |
1591 | ||
1592 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1593 | switch (type) { | |
1594 | case SC_TYPE_ENTRY: | |
1595 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; | |
1596 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
1597 | break; | |
1598 | case SC_TYPE_EXIT: | |
1599 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; | |
1600 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
1601 | break; | |
1602 | case SC_TYPE_COMPAT_ENTRY: | |
1603 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; | |
1604 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
1605 | break; | |
1606 | case SC_TYPE_COMPAT_EXIT: | |
1607 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; | |
1608 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
1609 | break; | |
1610 | } | |
1611 | strncat(event_notifier_param.event.name, desc->name, | |
1612 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
1613 | event_notifier_param.event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1614 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
1615 | ||
99f52fcc FD |
1616 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1617 | error_counter_index, group, &event_notifier_param, | |
1618 | filter, event_notifier_param.event.instrumentation); | |
8a8ac9a8 FD |
1619 | if (IS_ERR(event_notifier)) { |
1620 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
1621 | desc->name); | |
1622 | ret = -ENOMEM; | |
1623 | goto end; | |
1624 | } | |
1625 | ||
1626 | event_notifier->u.syscall.syscall_id = i; | |
1627 | } | |
1628 | ||
1629 | end: | |
1630 | return ret; | |
1631 | ||
1632 | } | |
1633 | ||
1634 | int lttng_syscals_create_matching_event_notifiers( | |
1635 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1636 | void *filter) | |
1637 | { | |
1638 | int ret; | |
1639 | struct lttng_enabler *base_enabler = | |
1640 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
1641 | enum lttng_kernel_syscall_entryexit entryexit = | |
1642 | base_enabler->event_param.u.syscall.entryexit; | |
1643 | ||
1644 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) { | |
1645 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
1646 | filter, sc_table, ARRAY_SIZE(sc_table), SC_TYPE_ENTRY); | |
1647 | if (ret) | |
1648 | goto end; | |
1649 | ||
1650 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
1651 | filter, compat_sc_table, ARRAY_SIZE(compat_sc_table), | |
1652 | SC_TYPE_COMPAT_ENTRY); | |
1653 | if (ret) | |
1654 | goto end; | |
1655 | ||
1656 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1657 | SC_TYPE_ENTRY); | |
1658 | if (ret) | |
1659 | goto end; | |
1660 | ||
1661 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1662 | SC_TYPE_COMPAT_ENTRY); | |
1663 | if (ret) | |
1664 | goto end; | |
1665 | } | |
1666 | ||
1667 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) { | |
1668 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
1669 | filter, sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
1670 | SC_TYPE_EXIT); | |
1671 | if (ret) | |
1672 | goto end; | |
1673 | ||
1674 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1675 | SC_TYPE_EXIT); | |
1676 | if (ret) | |
1677 | goto end; | |
1678 | ||
1679 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
1680 | filter, compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
1681 | SC_TYPE_COMPAT_EXIT); | |
1682 | if (ret) | |
1683 | goto end; | |
1684 | ||
1685 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1686 | SC_TYPE_COMPAT_EXIT); | |
1687 | if (ret) | |
1688 | goto end; | |
1689 | } | |
1690 | ||
1691 | end: | |
1692 | return ret; | |
1693 | } | |
1694 | ||
1695 | /* | |
1696 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1697 | */ |
3b82c4e1 | 1698 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1699 | struct lttng_event_notifier_group *event_notifier_group) |
1700 | { | |
1701 | int ret; | |
1702 | ||
1703 | /* | |
1704 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1705 | * At the moment, we don't think it's desirable to have one fired | |
1706 | * event_notifier for the entry and one for the exit of a syscall. | |
1707 | */ | |
1708 | if (event_notifier_group->sys_enter_registered) { | |
1709 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1710 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1711 | if (ret) | |
1712 | return ret; | |
1713 | event_notifier_group->sys_enter_registered = 0; | |
1714 | } | |
1715 | if (event_notifier_group->sys_exit_registered) { | |
1716 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1717 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1718 | if (ret) | |
1719 | return ret; | |
1720 | event_notifier_group->sys_enter_registered = 0; | |
1721 | } | |
1722 | ||
1723 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1724 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1725 | #ifdef CONFIG_COMPAT | |
1726 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1727 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1728 | #endif | |
1729 | return 0; | |
1730 | } | |
1731 | ||
3b82c4e1 | 1732 | int lttng_syscalls_unregister_channel(struct lttng_channel *chan) |
259b6cb3 MD |
1733 | { |
1734 | int ret; | |
1735 | ||
1736 | if (!chan->sc_table) | |
1737 | return 0; | |
80f87dd2 | 1738 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1739 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1740 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1741 | if (ret) |
1742 | return ret; | |
1743 | chan->sys_enter_registered = 0; | |
1744 | } | |
1745 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1746 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1747 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1748 | if (ret) |
1749 | return ret; | |
1750 | chan->sys_exit_registered = 0; | |
1751 | } | |
badfe9f5 MD |
1752 | return 0; |
1753 | } | |
1754 | ||
2d6d88c6 | 1755 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 1756 | { |
259b6cb3 | 1757 | kfree(chan->sc_table); |
5b7ac358 | 1758 | kfree(chan->sc_exit_table); |
49c50022 MD |
1759 | #ifdef CONFIG_COMPAT |
1760 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1761 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1762 | #endif |
80f87dd2 MD |
1763 | kfree(chan->sc_filter); |
1764 | return 0; | |
1765 | } | |
1766 | ||
1767 | static | |
1768 | int get_syscall_nr(const char *syscall_name) | |
1769 | { | |
1770 | int syscall_nr = -1; | |
1771 | int i; | |
1772 | ||
1773 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
1774 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1775 | const char *it_name; |
80f87dd2 MD |
1776 | |
1777 | entry = &sc_table[i]; | |
1778 | if (!entry->desc) | |
1779 | continue; | |
5b7ac358 MD |
1780 | it_name = entry->desc->name; |
1781 | it_name += strlen(SYSCALL_ENTRY_STR); | |
1782 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1783 | syscall_nr = i; |
1784 | break; | |
1785 | } | |
1786 | } | |
1787 | return syscall_nr; | |
1788 | } | |
1789 | ||
1790 | static | |
1791 | int get_compat_syscall_nr(const char *syscall_name) | |
1792 | { | |
1793 | int syscall_nr = -1; | |
1794 | int i; | |
1795 | ||
1796 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
1797 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1798 | const char *it_name; |
80f87dd2 MD |
1799 | |
1800 | entry = &compat_sc_table[i]; | |
1801 | if (!entry->desc) | |
1802 | continue; | |
5b7ac358 MD |
1803 | it_name = entry->desc->name; |
1804 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1805 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1806 | syscall_nr = i; |
1807 | break; | |
1808 | } | |
1809 | } | |
1810 | return syscall_nr; | |
1811 | } | |
1812 | ||
12e579db MD |
1813 | static |
1814 | uint32_t get_sc_tables_len(void) | |
1815 | { | |
1816 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1817 | } | |
1818 | ||
badfe9f5 | 1819 | static |
ade8a729 FD |
1820 | const char *get_syscall_name(const char *desc_name, |
1821 | enum lttng_syscall_abi abi, | |
1822 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1823 | { |
badfe9f5 | 1824 | size_t prefix_len = 0; |
80f87dd2 | 1825 | |
80f87dd2 | 1826 | |
ade8a729 | 1827 | switch (entryexit) { |
badfe9f5 | 1828 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1829 | switch (abi) { |
badfe9f5 MD |
1830 | case LTTNG_SYSCALL_ABI_NATIVE: |
1831 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1832 | break; | |
1833 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1834 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1835 | break; | |
80f87dd2 | 1836 | } |
badfe9f5 MD |
1837 | break; |
1838 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1839 | switch (abi) { |
badfe9f5 MD |
1840 | case LTTNG_SYSCALL_ABI_NATIVE: |
1841 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1842 | break; | |
1843 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1844 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1845 | break; | |
80f87dd2 | 1846 | } |
badfe9f5 | 1847 | break; |
80f87dd2 | 1848 | } |
badfe9f5 | 1849 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1850 | return desc_name + prefix_len; |
badfe9f5 MD |
1851 | } |
1852 | ||
ade8a729 FD |
1853 | static |
1854 | int lttng_syscall_filter_enable( | |
1855 | struct lttng_syscall_filter *filter, | |
1856 | const char *desc_name, enum lttng_syscall_abi abi, | |
1857 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1858 | { |
badfe9f5 MD |
1859 | const char *syscall_name; |
1860 | unsigned long *bitmap; | |
1861 | int syscall_nr; | |
1862 | ||
ade8a729 | 1863 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1864 | |
ade8a729 | 1865 | switch (abi) { |
badfe9f5 MD |
1866 | case LTTNG_SYSCALL_ABI_NATIVE: |
1867 | syscall_nr = get_syscall_nr(syscall_name); | |
1868 | break; | |
1869 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1870 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1871 | break; | |
1872 | default: | |
1873 | return -EINVAL; | |
80f87dd2 | 1874 | } |
badfe9f5 MD |
1875 | if (syscall_nr < 0) |
1876 | return -ENOENT; | |
1877 | ||
ade8a729 | 1878 | switch (entryexit) { |
badfe9f5 | 1879 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1880 | switch (abi) { |
badfe9f5 MD |
1881 | case LTTNG_SYSCALL_ABI_NATIVE: |
1882 | bitmap = filter->sc_entry; | |
1883 | break; | |
1884 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1885 | bitmap = filter->sc_compat_entry; | |
1886 | break; | |
6d9694d8 MD |
1887 | default: |
1888 | return -EINVAL; | |
80f87dd2 | 1889 | } |
badfe9f5 MD |
1890 | break; |
1891 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1892 | switch (abi) { |
badfe9f5 MD |
1893 | case LTTNG_SYSCALL_ABI_NATIVE: |
1894 | bitmap = filter->sc_exit; | |
1895 | break; | |
1896 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1897 | bitmap = filter->sc_compat_exit; | |
1898 | break; | |
6d9694d8 MD |
1899 | default: |
1900 | return -EINVAL; | |
80f87dd2 | 1901 | } |
badfe9f5 MD |
1902 | break; |
1903 | default: | |
1904 | return -EINVAL; | |
80f87dd2 | 1905 | } |
badfe9f5 MD |
1906 | if (test_bit(syscall_nr, bitmap)) |
1907 | return -EEXIST; | |
1908 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1909 | return 0; |
80f87dd2 MD |
1910 | } |
1911 | ||
8a8ac9a8 FD |
1912 | int lttng_syscall_filter_enable_event_notifier( |
1913 | struct lttng_event_notifier *notifier) | |
1914 | { | |
1915 | struct lttng_event_notifier_group *group = notifier->group; | |
1916 | unsigned int syscall_id = notifier->u.syscall.syscall_id; | |
1917 | struct hlist_head *dispatch_list; | |
1918 | int ret = 0; | |
1919 | ||
1920 | WARN_ON_ONCE(notifier->instrumentation != LTTNG_KERNEL_SYSCALL); | |
1921 | ||
1922 | ret = lttng_syscall_filter_enable(group->sc_filter, | |
1923 | notifier->desc->name, notifier->u.syscall.abi, | |
1924 | notifier->u.syscall.entryexit); | |
1925 | if (ret) { | |
1926 | goto end; | |
1927 | } | |
1928 | ||
1929 | switch (notifier->u.syscall.entryexit) { | |
1930 | case LTTNG_SYSCALL_ENTRY: | |
1931 | switch (notifier->u.syscall.abi) { | |
1932 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1933 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1934 | break; | |
1935 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1936 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1937 | break; | |
6866b1c7 MJ |
1938 | default: |
1939 | ret = -EINVAL; | |
1940 | goto end; | |
8a8ac9a8 FD |
1941 | } |
1942 | break; | |
1943 | case LTTNG_SYSCALL_EXIT: | |
1944 | switch (notifier->u.syscall.abi) { | |
1945 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1946 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1947 | break; | |
1948 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1949 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1950 | break; | |
6866b1c7 MJ |
1951 | default: |
1952 | ret = -EINVAL; | |
1953 | goto end; | |
8a8ac9a8 FD |
1954 | } |
1955 | break; | |
6866b1c7 MJ |
1956 | default: |
1957 | ret = -EINVAL; | |
1958 | goto end; | |
8a8ac9a8 FD |
1959 | } |
1960 | ||
1961 | hlist_add_head_rcu(¬ifier->u.syscall.node, dispatch_list); | |
1962 | ||
1963 | end: | |
1964 | return ret ; | |
1965 | } | |
1966 | ||
ade8a729 FD |
1967 | int lttng_syscall_filter_enable_event( |
1968 | struct lttng_channel *channel, | |
badfe9f5 | 1969 | struct lttng_event *event) |
80f87dd2 | 1970 | { |
ade8a729 FD |
1971 | WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL); |
1972 | ||
1973 | return lttng_syscall_filter_enable(channel->sc_filter, | |
1974 | event->desc->name, event->u.syscall.abi, | |
1975 | event->u.syscall.entryexit); | |
1976 | } | |
1977 | ||
1978 | static | |
1979 | int lttng_syscall_filter_disable( | |
1980 | struct lttng_syscall_filter *filter, | |
1981 | const char *desc_name, enum lttng_syscall_abi abi, | |
1982 | enum lttng_syscall_entryexit entryexit) | |
1983 | { | |
badfe9f5 MD |
1984 | const char *syscall_name; |
1985 | unsigned long *bitmap; | |
1986 | int syscall_nr; | |
80f87dd2 | 1987 | |
ade8a729 | 1988 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1989 | |
ade8a729 | 1990 | switch (abi) { |
badfe9f5 MD |
1991 | case LTTNG_SYSCALL_ABI_NATIVE: |
1992 | syscall_nr = get_syscall_nr(syscall_name); | |
1993 | break; | |
1994 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1995 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1996 | break; | |
1997 | default: | |
1998 | return -EINVAL; | |
80f87dd2 | 1999 | } |
badfe9f5 MD |
2000 | if (syscall_nr < 0) |
2001 | return -ENOENT; | |
80f87dd2 | 2002 | |
ade8a729 | 2003 | switch (entryexit) { |
badfe9f5 | 2004 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 2005 | switch (abi) { |
badfe9f5 MD |
2006 | case LTTNG_SYSCALL_ABI_NATIVE: |
2007 | bitmap = filter->sc_entry; | |
2008 | break; | |
2009 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2010 | bitmap = filter->sc_compat_entry; | |
2011 | break; | |
6d9694d8 MD |
2012 | default: |
2013 | return -EINVAL; | |
80f87dd2 | 2014 | } |
badfe9f5 MD |
2015 | break; |
2016 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 2017 | switch (abi) { |
badfe9f5 MD |
2018 | case LTTNG_SYSCALL_ABI_NATIVE: |
2019 | bitmap = filter->sc_exit; | |
2020 | break; | |
2021 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2022 | bitmap = filter->sc_compat_exit; | |
2023 | break; | |
6d9694d8 MD |
2024 | default: |
2025 | return -EINVAL; | |
80f87dd2 | 2026 | } |
badfe9f5 MD |
2027 | break; |
2028 | default: | |
2029 | return -EINVAL; | |
80f87dd2 | 2030 | } |
badfe9f5 MD |
2031 | if (!test_bit(syscall_nr, bitmap)) |
2032 | return -EEXIST; | |
2033 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 2034 | |
badfe9f5 | 2035 | return 0; |
259b6cb3 | 2036 | } |
2d2464bd | 2037 | |
8a8ac9a8 FD |
2038 | int lttng_syscall_filter_disable_event_notifier( |
2039 | struct lttng_event_notifier *notifier) | |
2040 | { | |
2041 | struct lttng_event_notifier_group *group = notifier->group; | |
2042 | int ret; | |
2043 | ||
2044 | WARN_ON_ONCE(notifier->instrumentation != LTTNG_KERNEL_SYSCALL); | |
2045 | ||
2046 | ret = lttng_syscall_filter_disable(group->sc_filter, | |
2047 | notifier->desc->name, notifier->u.syscall.abi, | |
2048 | notifier->u.syscall.entryexit); | |
2049 | WARN_ON_ONCE(ret != 0); | |
2050 | ||
2051 | hlist_del_rcu(¬ifier->u.syscall.node); | |
2052 | return 0; | |
2053 | } | |
2054 | ||
ade8a729 FD |
2055 | int lttng_syscall_filter_disable_event( |
2056 | struct lttng_channel *channel, | |
2057 | struct lttng_event *event) | |
2058 | { | |
2059 | return lttng_syscall_filter_disable(channel->sc_filter, | |
2060 | event->desc->name, event->u.syscall.abi, | |
2061 | event->u.syscall.entryexit); | |
2062 | } | |
2063 | ||
2d2464bd MD |
2064 | static |
2065 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
2066 | { | |
2067 | const struct trace_syscall_entry *entry; | |
2068 | int iter = 0; | |
2069 | ||
2070 | for (entry = sc_table; | |
2071 | entry < sc_table + ARRAY_SIZE(sc_table); | |
2072 | entry++) { | |
2073 | if (iter++ >= *pos) | |
2074 | return entry; | |
2075 | } | |
2076 | for (entry = compat_sc_table; | |
2077 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
2078 | entry++) { | |
2079 | if (iter++ >= *pos) | |
2080 | return entry; | |
2081 | } | |
2082 | /* End of list */ | |
2083 | return NULL; | |
2084 | } | |
2085 | ||
2086 | static | |
2087 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
2088 | { | |
2089 | return (void *) syscall_list_get_entry(pos); | |
2090 | } | |
2091 | ||
2092 | static | |
2093 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
2094 | { | |
2095 | (*ppos)++; | |
2096 | return (void *) syscall_list_get_entry(ppos); | |
2097 | } | |
2098 | ||
2099 | static | |
2100 | void syscall_list_stop(struct seq_file *m, void *p) | |
2101 | { | |
2102 | } | |
2103 | ||
12e579db MD |
2104 | static |
2105 | int get_sc_table(const struct trace_syscall_entry *entry, | |
2106 | const struct trace_syscall_entry **table, | |
2107 | unsigned int *bitness) | |
2108 | { | |
2109 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
2110 | if (bitness) | |
2111 | *bitness = BITS_PER_LONG; | |
2112 | if (table) | |
2113 | *table = sc_table; | |
2114 | return 0; | |
2115 | } | |
2116 | if (!(entry >= compat_sc_table | |
2117 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
2118 | return -EINVAL; | |
2119 | } | |
2120 | if (bitness) | |
2121 | *bitness = 32; | |
2122 | if (table) | |
2123 | *table = compat_sc_table; | |
2124 | return 0; | |
2125 | } | |
2126 | ||
2d2464bd MD |
2127 | static |
2128 | int syscall_list_show(struct seq_file *m, void *p) | |
2129 | { | |
2130 | const struct trace_syscall_entry *table, *entry = p; | |
2131 | unsigned int bitness; | |
d4291869 | 2132 | unsigned long index; |
12e579db | 2133 | int ret; |
d4291869 | 2134 | const char *name; |
2d2464bd | 2135 | |
12e579db MD |
2136 | ret = get_sc_table(entry, &table, &bitness); |
2137 | if (ret) | |
2138 | return ret; | |
f4855b46 MD |
2139 | if (!entry->desc) |
2140 | return 0; | |
d4291869 MD |
2141 | if (table == sc_table) { |
2142 | index = entry - table; | |
2143 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
2144 | } else { | |
2145 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
2146 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
2147 | } | |
12e579db | 2148 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 2149 | index, name, bitness); |
2d2464bd MD |
2150 | return 0; |
2151 | } | |
2152 | ||
2153 | static | |
2154 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
2155 | .start = syscall_list_start, | |
2156 | .next = syscall_list_next, | |
2157 | .stop = syscall_list_stop, | |
2158 | .show = syscall_list_show, | |
2159 | }; | |
2160 | ||
2161 | static | |
2162 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
2163 | { | |
2164 | return seq_open(file, <tng_syscall_list_seq_ops); | |
2165 | } | |
2166 | ||
2167 | const struct file_operations lttng_syscall_list_fops = { | |
2168 | .owner = THIS_MODULE, | |
2169 | .open = lttng_syscall_list_open, | |
2170 | .read = seq_read, | |
2171 | .llseek = seq_lseek, | |
2172 | .release = seq_release, | |
2173 | }; | |
12e579db | 2174 | |
badfe9f5 MD |
2175 | /* |
2176 | * A syscall is enabled if it is traced for either entry or exit. | |
2177 | */ | |
12e579db MD |
2178 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
2179 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
2180 | { | |
2181 | uint32_t len, sc_tables_len, bitmask_len; | |
2182 | int ret = 0, bit; | |
2183 | char *tmp_mask; | |
2184 | struct lttng_syscall_filter *filter; | |
2185 | ||
2186 | ret = get_user(len, &usyscall_mask->len); | |
2187 | if (ret) | |
2188 | return ret; | |
2189 | sc_tables_len = get_sc_tables_len(); | |
2190 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
2191 | if (len < sc_tables_len) { | |
2192 | return put_user(sc_tables_len, &usyscall_mask->len); | |
2193 | } | |
2194 | /* Array is large enough, we can copy array to user-space. */ | |
2195 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
2196 | if (!tmp_mask) | |
2197 | return -ENOMEM; | |
2198 | filter = channel->sc_filter; | |
2199 | ||
2200 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 2201 | char state; |
2f25059d MD |
2202 | |
2203 | if (channel->sc_table) { | |
3b82c4e1 MD |
2204 | if (!(READ_ONCE(channel->syscall_all_entry) |
2205 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
badfe9f5 MD |
2206 | state = test_bit(bit, filter->sc_entry) |
2207 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
2208 | else |
2209 | state = 1; | |
2210 | } else { | |
2211 | state = 0; | |
2212 | } | |
2213 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
2214 | } |
2215 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 2216 | char state; |
2f25059d MD |
2217 | |
2218 | if (channel->compat_sc_table) { | |
3b82c4e1 MD |
2219 | if (!(READ_ONCE(channel->syscall_all_entry) |
2220 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
2f25059d | 2221 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
badfe9f5 MD |
2222 | filter->sc_compat_entry) |
2223 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
2224 | filter->sc_compat_exit); | |
2f25059d MD |
2225 | else |
2226 | state = 1; | |
2227 | } else { | |
2228 | state = 0; | |
2229 | } | |
2230 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
2231 | } |
2232 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
2233 | ret = -EFAULT; | |
2234 | kfree(tmp_mask); | |
2235 | return ret; | |
2236 | } | |
082d4946 MD |
2237 | |
2238 | int lttng_abi_syscall_list(void) | |
2239 | { | |
2240 | struct file *syscall_list_file; | |
2241 | int file_fd, ret; | |
2242 | ||
4ac10b76 | 2243 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
2244 | if (file_fd < 0) { |
2245 | ret = file_fd; | |
2246 | goto fd_error; | |
2247 | } | |
2248 | ||
2249 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
2250 | <tng_syscall_list_fops, | |
2251 | NULL, O_RDWR); | |
2252 | if (IS_ERR(syscall_list_file)) { | |
2253 | ret = PTR_ERR(syscall_list_file); | |
2254 | goto file_error; | |
2255 | } | |
2256 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
2257 | if (ret < 0) | |
2258 | goto open_error; | |
2259 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
2260 | return file_fd; |
2261 | ||
2262 | open_error: | |
2263 | fput(syscall_list_file); | |
2264 | file_error: | |
2265 | put_unused_fd(file_fd); | |
2266 | fd_error: | |
2267 | return ret; | |
2268 | } |