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> |
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 | ||
5f4c791e | 94 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
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; |
437d5aa5 MD |
297 | const struct lttng_kernel_event_desc *desc; |
298 | const struct lttng_kernel_event_field **fields; | |
a93244f8 MD |
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]; |
a67ba386 | 395 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 396 | |
1b7b9c65 | 397 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
398 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
399 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
400 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
401 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
402 | ||
3b82c4e1 | 403 | if (unlikely(in_compat_syscall())) |
a67ba386 | 404 | __event_probe__compat_syscall_entry_unknown(event_recorder, id, args); |
3b82c4e1 | 405 | else |
a67ba386 | 406 | __event_probe__syscall_entry_unknown(event_recorder, id, args); |
3b82c4e1 | 407 | } |
f405cfce MD |
408 | } |
409 | ||
8a8ac9a8 FD |
410 | static void syscall_entry_event_notifier_unknown( |
411 | struct hlist_head *unknown_dispatch_list_head, | |
412 | struct pt_regs *regs, long id) | |
413 | { | |
414 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
a67ba386 | 415 | struct lttng_kernel_event_common_private *event_priv; |
8a8ac9a8 FD |
416 | |
417 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
418 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_dispatch_list_head, u.syscall.node) { |
419 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
420 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
421 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
422 | ||
8a8ac9a8 | 423 | if (unlikely(in_compat_syscall())) |
a67ba386 | 424 | __event_notifier_probe__compat_syscall_entry_unknown(event_notifier, id, args); |
8a8ac9a8 | 425 | else |
a67ba386 | 426 | __event_notifier_probe__syscall_entry_unknown(event_notifier, id, args); |
8a8ac9a8 FD |
427 | } |
428 | } | |
429 | ||
430 | static void syscall_exit_event_notifier_unknown( | |
431 | struct hlist_head *unknown_dispatch_list_head, | |
432 | struct pt_regs *regs, long id, long ret) | |
433 | { | |
434 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
a67ba386 | 435 | struct lttng_kernel_event_common_private *event_priv; |
8a8ac9a8 FD |
436 | |
437 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
438 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_dispatch_list_head, u.syscall.node) { |
439 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
440 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
441 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
442 | ||
8a8ac9a8 | 443 | if (unlikely(in_compat_syscall())) |
a67ba386 | 444 | __event_notifier_probe__compat_syscall_exit_unknown(event_notifier, id, ret, args); |
8a8ac9a8 | 445 | else |
a67ba386 | 446 | __event_notifier_probe__syscall_exit_unknown(event_notifier, id, ret, args); |
8a8ac9a8 FD |
447 | } |
448 | } | |
449 | ||
63aa9160 | 450 | static __always_inline |
3b82c4e1 MD |
451 | void syscall_entry_call_func(struct hlist_head *action_list, |
452 | void *func, unsigned int nrargs, | |
63aa9160 | 453 | struct pt_regs *regs) |
259b6cb3 | 454 | { |
a67ba386 | 455 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 456 | |
63aa9160 | 457 | switch (nrargs) { |
259b6cb3 MD |
458 | case 0: |
459 | { | |
63aa9160 | 460 | void (*fptr)(void *__data) = func; |
259b6cb3 | 461 | |
a67ba386 MD |
462 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
463 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
464 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
465 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
466 | ||
467 | fptr(event_recorder); | |
468 | } | |
259b6cb3 MD |
469 | break; |
470 | } | |
471 | case 1: | |
472 | { | |
63aa9160 | 473 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 474 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 475 | |
1b7b9c65 | 476 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
477 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
478 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
479 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
480 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
481 | ||
482 | fptr(event_recorder, args[0]); | |
483 | } | |
259b6cb3 MD |
484 | break; |
485 | } | |
486 | case 2: | |
487 | { | |
488 | void (*fptr)(void *__data, | |
489 | unsigned long arg0, | |
63aa9160 | 490 | unsigned long arg1) = func; |
1b7b9c65 | 491 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 492 | |
1b7b9c65 | 493 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
494 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
495 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
496 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
497 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
498 | ||
499 | fptr(event_recorder, args[0], args[1]); | |
500 | } | |
259b6cb3 MD |
501 | break; |
502 | } | |
503 | case 3: | |
504 | { | |
505 | void (*fptr)(void *__data, | |
506 | unsigned long arg0, | |
507 | unsigned long arg1, | |
63aa9160 | 508 | unsigned long arg2) = func; |
1b7b9c65 | 509 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 510 | |
1b7b9c65 | 511 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
512 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
513 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
514 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
515 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
516 | ||
517 | fptr(event_recorder, args[0], args[1], args[2]); | |
518 | } | |
259b6cb3 MD |
519 | break; |
520 | } | |
521 | case 4: | |
522 | { | |
523 | void (*fptr)(void *__data, | |
524 | unsigned long arg0, | |
525 | unsigned long arg1, | |
526 | unsigned long arg2, | |
63aa9160 | 527 | unsigned long arg3) = func; |
1b7b9c65 | 528 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 529 | |
1b7b9c65 | 530 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
531 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
532 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
533 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
534 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
535 | ||
536 | fptr(event_recorder, args[0], args[1], args[2], args[3]); | |
537 | } | |
259b6cb3 MD |
538 | break; |
539 | } | |
540 | case 5: | |
541 | { | |
542 | void (*fptr)(void *__data, | |
543 | unsigned long arg0, | |
544 | unsigned long arg1, | |
545 | unsigned long arg2, | |
546 | unsigned long arg3, | |
63aa9160 | 547 | unsigned long arg4) = func; |
1b7b9c65 | 548 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 549 | |
1b7b9c65 | 550 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
551 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
552 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
553 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
554 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
555 | ||
556 | fptr(event_recorder, args[0], args[1], args[2], args[3], args[4]); | |
557 | } | |
259b6cb3 MD |
558 | break; |
559 | } | |
560 | case 6: | |
561 | { | |
562 | void (*fptr)(void *__data, | |
563 | unsigned long arg0, | |
564 | unsigned long arg1, | |
565 | unsigned long arg2, | |
566 | unsigned long arg3, | |
567 | unsigned long arg4, | |
63aa9160 | 568 | unsigned long arg5) = func; |
1b7b9c65 | 569 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 570 | |
1b7b9c65 | 571 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
572 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
573 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
574 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
575 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
576 | ||
577 | fptr(event_recorder, args[0], args[1], args[2], | |
3b82c4e1 | 578 | args[3], args[4], args[5]); |
a67ba386 | 579 | } |
259b6cb3 MD |
580 | break; |
581 | } | |
582 | default: | |
583 | break; | |
584 | } | |
585 | } | |
586 | ||
8a8ac9a8 FD |
587 | static __always_inline |
588 | void syscall_entry_event_notifier_call_func(struct hlist_head *dispatch_list, | |
589 | void *func, unsigned int nrargs, struct pt_regs *regs) | |
590 | { | |
a67ba386 | 591 | struct lttng_kernel_event_common_private *event_priv; |
8a8ac9a8 FD |
592 | |
593 | switch (nrargs) { | |
594 | case 0: | |
595 | { | |
596 | void (*fptr)(void *__data) = func; | |
597 | ||
a67ba386 MD |
598 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
599 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
600 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
601 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
602 | ||
603 | fptr(event_notifier); | |
604 | } | |
8a8ac9a8 FD |
605 | break; |
606 | } | |
607 | case 1: | |
608 | { | |
609 | void (*fptr)(void *__data, unsigned long arg0) = func; | |
610 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
611 | ||
612 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
613 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
614 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
615 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
616 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
617 | ||
618 | fptr(event_notifier, args[0]); | |
619 | } | |
8a8ac9a8 FD |
620 | break; |
621 | } | |
622 | case 2: | |
623 | { | |
624 | void (*fptr)(void *__data, | |
625 | unsigned long arg0, | |
626 | unsigned long arg1) = func; | |
627 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
628 | ||
629 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
630 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
631 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
632 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
633 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
634 | ||
635 | fptr(event_notifier, args[0], args[1]); | |
636 | } | |
8a8ac9a8 FD |
637 | break; |
638 | } | |
639 | case 3: | |
640 | { | |
641 | void (*fptr)(void *__data, | |
642 | unsigned long arg0, | |
643 | unsigned long arg1, | |
644 | unsigned long arg2) = func; | |
645 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
646 | ||
647 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
648 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
649 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
650 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
651 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
652 | ||
653 | fptr(event_notifier, args[0], args[1], args[2]); | |
654 | } | |
8a8ac9a8 FD |
655 | break; |
656 | } | |
657 | case 4: | |
658 | { | |
659 | void (*fptr)(void *__data, | |
660 | unsigned long arg0, | |
661 | unsigned long arg1, | |
662 | unsigned long arg2, | |
663 | unsigned long arg3) = func; | |
664 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
665 | ||
666 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
667 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
668 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
669 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
670 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
671 | ||
672 | fptr(event_notifier, args[0], args[1], args[2], args[3]); | |
673 | } | |
8a8ac9a8 FD |
674 | break; |
675 | } | |
676 | case 5: | |
677 | { | |
678 | void (*fptr)(void *__data, | |
679 | unsigned long arg0, | |
680 | unsigned long arg1, | |
681 | unsigned long arg2, | |
682 | unsigned long arg3, | |
683 | unsigned long arg4) = func; | |
684 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
685 | ||
686 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
687 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
688 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
689 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
690 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
691 | ||
692 | fptr(event_notifier, args[0], args[1], args[2], args[3], args[4]); | |
693 | } | |
8a8ac9a8 FD |
694 | break; |
695 | } | |
696 | case 6: | |
697 | { | |
698 | void (*fptr)(void *__data, | |
699 | unsigned long arg0, | |
700 | unsigned long arg1, | |
701 | unsigned long arg2, | |
702 | unsigned long arg3, | |
703 | unsigned long arg4, | |
704 | unsigned long arg5) = func; | |
705 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
706 | ||
707 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
708 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
709 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
710 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
711 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
712 | ||
713 | fptr(event_notifier, args[0], args[1], args[2], args[3], args[4], args[5]); | |
714 | } | |
8a8ac9a8 FD |
715 | break; |
716 | } | |
717 | default: | |
718 | break; | |
719 | } | |
720 | } | |
721 | ||
63aa9160 FD |
722 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
723 | { | |
724 | struct lttng_channel *chan = __data; | |
3b82c4e1 | 725 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
726 | const struct trace_syscall_entry *table, *entry; |
727 | size_t table_len; | |
728 | ||
729 | if (unlikely(in_compat_syscall())) { | |
730 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
731 | ||
732 | if (id < 0 || id >= NR_compat_syscalls | |
3b82c4e1 | 733 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
734 | /* System call filtered out. */ |
735 | return; | |
736 | } | |
737 | table = compat_sc_table; | |
738 | table_len = ARRAY_SIZE(compat_sc_table); | |
3b82c4e1 | 739 | unknown_action_list = &chan->sc_compat_unknown; |
63aa9160 FD |
740 | } else { |
741 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
742 | ||
743 | if (id < 0 || id >= NR_syscalls | |
3b82c4e1 | 744 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
745 | /* System call filtered out. */ |
746 | return; | |
747 | } | |
748 | table = sc_table; | |
749 | table_len = ARRAY_SIZE(sc_table); | |
3b82c4e1 | 750 | unknown_action_list = &chan->sc_unknown; |
63aa9160 FD |
751 | } |
752 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 753 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
754 | return; |
755 | } | |
3b82c4e1 MD |
756 | |
757 | entry = &table[id]; | |
758 | if (!entry->event_func) { | |
759 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
760 | return; |
761 | } | |
3b82c4e1 MD |
762 | |
763 | if (unlikely(in_compat_syscall())) { | |
764 | action_list = &chan->compat_sc_table[id]; | |
765 | } else { | |
766 | action_list = &chan->sc_table[id]; | |
767 | } | |
768 | if (unlikely(hlist_empty(action_list))) | |
769 | return; | |
770 | ||
771 | syscall_entry_call_func(action_list, entry->event_func, entry->nrargs, regs); | |
63aa9160 FD |
772 | } |
773 | ||
8a8ac9a8 FD |
774 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
775 | long id) | |
776 | { | |
777 | struct lttng_event_notifier_group *group = __data; | |
778 | const struct trace_syscall_entry *table, *entry; | |
779 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
780 | size_t table_len; | |
781 | ||
782 | if (unlikely(in_compat_syscall())) { | |
783 | struct lttng_syscall_filter *filter = group->sc_filter; | |
784 | ||
785 | if (id < 0 || id >= NR_compat_syscalls | |
786 | || (!READ_ONCE(group->syscall_all_entry) && | |
787 | !test_bit(id, filter->sc_compat_entry))) { | |
788 | /* System call filtered out. */ | |
789 | return; | |
790 | } | |
791 | table = compat_sc_table; | |
792 | table_len = ARRAY_SIZE(compat_sc_table); | |
793 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
794 | } else { | |
795 | struct lttng_syscall_filter *filter = group->sc_filter; | |
796 | ||
797 | if (id < 0 || id >= NR_syscalls | |
798 | || (!READ_ONCE(group->syscall_all_entry) && | |
799 | !test_bit(id, filter->sc_entry))) { | |
800 | /* System call filtered out. */ | |
801 | return; | |
802 | } | |
803 | table = sc_table; | |
804 | table_len = ARRAY_SIZE(sc_table); | |
805 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
806 | } | |
807 | /* Check if the syscall id is out of bound. */ | |
808 | if (unlikely(id < 0 || id >= table_len)) { | |
809 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
810 | regs, id); | |
811 | return; | |
812 | } | |
813 | ||
814 | entry = &table[id]; | |
815 | if (!entry->event_notifier_func) { | |
816 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
817 | regs, id); | |
818 | return; | |
819 | } | |
820 | ||
821 | if (unlikely(in_compat_syscall())) { | |
822 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
823 | } else { | |
824 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
825 | } | |
826 | if (unlikely(hlist_empty(dispatch_list))) | |
827 | return; | |
828 | ||
829 | syscall_entry_event_notifier_call_func(dispatch_list, | |
830 | entry->event_notifier_func, entry->nrargs, regs); | |
831 | } | |
832 | ||
3b82c4e1 | 833 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 834 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 835 | { |
1b7b9c65 | 836 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 837 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 838 | |
1b7b9c65 | 839 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
840 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
841 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
842 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
843 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
844 | ||
3b82c4e1 | 845 | if (unlikely(in_compat_syscall())) |
a67ba386 | 846 | __event_probe__compat_syscall_exit_unknown(event_recorder, id, ret, |
3b82c4e1 MD |
847 | args); |
848 | else | |
a67ba386 | 849 | __event_probe__syscall_exit_unknown(event_recorder, id, ret, args); |
3b82c4e1 | 850 | } |
5b7ac358 MD |
851 | } |
852 | ||
3b82c4e1 MD |
853 | static __always_inline |
854 | void syscall_exit_call_func(struct hlist_head *action_list, | |
855 | void *func, unsigned int nrargs, | |
856 | struct pt_regs *regs, long ret) | |
5b7ac358 | 857 | { |
a67ba386 | 858 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 859 | |
3b82c4e1 | 860 | switch (nrargs) { |
5b7ac358 MD |
861 | case 0: |
862 | { | |
3b82c4e1 | 863 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 864 | |
a67ba386 MD |
865 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
866 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
867 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
868 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
869 | ||
870 | fptr(event_recorder, ret); | |
871 | } | |
5b7ac358 MD |
872 | break; |
873 | } | |
874 | case 1: | |
875 | { | |
876 | void (*fptr)(void *__data, | |
fc4f7161 | 877 | long ret, |
3b82c4e1 | 878 | unsigned long arg0) = func; |
1b7b9c65 | 879 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 880 | |
1b7b9c65 | 881 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
882 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
883 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
884 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
885 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
886 | ||
887 | fptr(event_recorder, ret, args[0]); | |
888 | } | |
5b7ac358 MD |
889 | break; |
890 | } | |
891 | case 2: | |
892 | { | |
893 | void (*fptr)(void *__data, | |
fc4f7161 | 894 | long ret, |
5b7ac358 | 895 | unsigned long arg0, |
3b82c4e1 | 896 | unsigned long arg1) = func; |
1b7b9c65 | 897 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 898 | |
1b7b9c65 | 899 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
900 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
901 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
902 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
903 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
904 | ||
905 | fptr(event_recorder, ret, args[0], args[1]); | |
906 | } | |
5b7ac358 MD |
907 | break; |
908 | } | |
909 | case 3: | |
910 | { | |
911 | void (*fptr)(void *__data, | |
fc4f7161 | 912 | long ret, |
5b7ac358 MD |
913 | unsigned long arg0, |
914 | unsigned long arg1, | |
3b82c4e1 | 915 | unsigned long arg2) = func; |
1b7b9c65 | 916 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 917 | |
1b7b9c65 | 918 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
919 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
920 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
921 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
922 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
923 | ||
924 | fptr(event_recorder, ret, args[0], args[1], args[2]); | |
925 | } | |
5b7ac358 MD |
926 | break; |
927 | } | |
928 | case 4: | |
929 | { | |
930 | void (*fptr)(void *__data, | |
fc4f7161 | 931 | long ret, |
5b7ac358 MD |
932 | unsigned long arg0, |
933 | unsigned long arg1, | |
934 | unsigned long arg2, | |
3b82c4e1 | 935 | unsigned long arg3) = func; |
1b7b9c65 | 936 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 937 | |
1b7b9c65 | 938 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
939 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
940 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
941 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
942 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
943 | ||
944 | fptr(event_recorder, ret, args[0], args[1], args[2], args[3]); | |
945 | } | |
5b7ac358 MD |
946 | break; |
947 | } | |
948 | case 5: | |
949 | { | |
950 | void (*fptr)(void *__data, | |
fc4f7161 | 951 | long ret, |
5b7ac358 MD |
952 | unsigned long arg0, |
953 | unsigned long arg1, | |
954 | unsigned long arg2, | |
955 | unsigned long arg3, | |
3b82c4e1 | 956 | unsigned long arg4) = func; |
1b7b9c65 | 957 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 958 | |
1b7b9c65 | 959 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
960 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
961 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
962 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
963 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
964 | ||
965 | fptr(event_recorder, ret, args[0], args[1], args[2], args[3], args[4]); | |
966 | } | |
5b7ac358 MD |
967 | break; |
968 | } | |
969 | case 6: | |
970 | { | |
971 | void (*fptr)(void *__data, | |
fc4f7161 | 972 | long ret, |
5b7ac358 MD |
973 | unsigned long arg0, |
974 | unsigned long arg1, | |
975 | unsigned long arg2, | |
976 | unsigned long arg3, | |
977 | unsigned long arg4, | |
3b82c4e1 | 978 | unsigned long arg5) = func; |
1b7b9c65 | 979 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 980 | |
1b7b9c65 | 981 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 MD |
982 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) { |
983 | struct lttng_kernel_event_recorder_private *event_recorder_priv = | |
984 | container_of(event_priv, struct lttng_kernel_event_recorder_private, parent); | |
985 | struct lttng_kernel_event_recorder *event_recorder = event_recorder_priv->pub; | |
986 | ||
987 | fptr(event_recorder, ret, args[0], args[1], args[2], | |
3b82c4e1 | 988 | args[3], args[4], args[5]); |
a67ba386 | 989 | } |
5b7ac358 MD |
990 | break; |
991 | } | |
992 | default: | |
993 | break; | |
994 | } | |
995 | } | |
996 | ||
3b82c4e1 MD |
997 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
998 | { | |
999 | struct lttng_channel *chan = __data; | |
1000 | struct hlist_head *action_list, *unknown_action_list; | |
1001 | const struct trace_syscall_entry *table, *entry; | |
1002 | size_t table_len; | |
1003 | long id; | |
1004 | ||
1005 | id = syscall_get_nr(current, regs); | |
1006 | ||
1007 | if (unlikely(in_compat_syscall())) { | |
1008 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
1009 | ||
1010 | if (id < 0 || id >= NR_compat_syscalls | |
1011 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { | |
1012 | /* System call filtered out. */ | |
1013 | return; | |
1014 | } | |
1015 | table = compat_sc_exit_table; | |
1016 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
1017 | unknown_action_list = &chan->compat_sc_exit_unknown; | |
1018 | } else { | |
1019 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
1020 | ||
1021 | if (id < 0 || id >= NR_syscalls | |
1022 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { | |
1023 | /* System call filtered out. */ | |
1024 | return; | |
1025 | } | |
1026 | table = sc_exit_table; | |
1027 | table_len = ARRAY_SIZE(sc_exit_table); | |
1028 | unknown_action_list = &chan->sc_exit_unknown; | |
1029 | } | |
1030 | if (unlikely(id < 0 || id >= table_len)) { | |
1031 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
1032 | return; | |
1033 | } | |
1034 | ||
1035 | entry = &table[id]; | |
1036 | if (!entry->event_func) { | |
1037 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
1038 | return; | |
1039 | } | |
1040 | ||
1041 | if (unlikely(in_compat_syscall())) { | |
1042 | action_list = &chan->compat_sc_exit_table[id]; | |
1043 | } else { | |
1044 | action_list = &chan->sc_exit_table[id]; | |
1045 | } | |
1046 | if (unlikely(hlist_empty(action_list))) | |
1047 | return; | |
1048 | ||
1049 | syscall_exit_call_func(action_list, entry->event_func, entry->nrargs, | |
1050 | regs, ret); | |
1051 | } | |
1052 | ||
8a8ac9a8 FD |
1053 | static __always_inline |
1054 | void syscall_exit_event_notifier_call_func(struct hlist_head *dispatch_list, | |
1055 | void *func, unsigned int nrargs, struct pt_regs *regs, long ret) | |
1056 | { | |
a67ba386 | 1057 | struct lttng_kernel_event_common_private *event_priv; |
8a8ac9a8 FD |
1058 | |
1059 | switch (nrargs) { | |
1060 | case 0: | |
1061 | { | |
1062 | void (*fptr)(void *__data, long ret) = func; | |
1063 | ||
a67ba386 MD |
1064 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
1065 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
1066 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1067 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
1068 | ||
1069 | fptr(event_notifier, ret); | |
1070 | } | |
8a8ac9a8 FD |
1071 | break; |
1072 | } | |
1073 | case 1: | |
1074 | { | |
1075 | void (*fptr)(void *__data, long ret, unsigned long arg0) = func; | |
1076 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
1077 | ||
1078 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
1079 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
1080 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
1081 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1082 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
1083 | ||
1084 | fptr(event_notifier, ret, args[0]); | |
1085 | } | |
8a8ac9a8 FD |
1086 | break; |
1087 | } | |
1088 | case 2: | |
1089 | { | |
1090 | void (*fptr)(void *__data, | |
1091 | long ret, | |
1092 | unsigned long arg0, | |
1093 | unsigned long arg1) = func; | |
1094 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
1095 | ||
1096 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
1097 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
1098 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
1099 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1100 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
1101 | ||
1102 | fptr(event_notifier, ret, args[0], args[1]); | |
1103 | } | |
8a8ac9a8 FD |
1104 | break; |
1105 | } | |
1106 | case 3: | |
1107 | { | |
1108 | void (*fptr)(void *__data, | |
1109 | long ret, | |
1110 | unsigned long arg0, | |
1111 | unsigned long arg1, | |
1112 | unsigned long arg2) = func; | |
1113 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
1114 | ||
1115 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
1116 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
1117 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
1118 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1119 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
1120 | ||
1121 | fptr(event_notifier, ret, args[0], args[1], args[2]); | |
1122 | } | |
8a8ac9a8 FD |
1123 | break; |
1124 | } | |
1125 | case 4: | |
1126 | { | |
1127 | void (*fptr)(void *__data, | |
1128 | long ret, | |
1129 | unsigned long arg0, | |
1130 | unsigned long arg1, | |
1131 | unsigned long arg2, | |
1132 | unsigned long arg3) = func; | |
1133 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
1134 | ||
1135 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
1136 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
1137 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
1138 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1139 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
1140 | ||
1141 | fptr(event_notifier, ret, args[0], args[1], args[2], args[3]); | |
1142 | } | |
8a8ac9a8 FD |
1143 | break; |
1144 | } | |
1145 | case 5: | |
1146 | { | |
1147 | void (*fptr)(void *__data, | |
1148 | long ret, | |
1149 | unsigned long arg0, | |
1150 | unsigned long arg1, | |
1151 | unsigned long arg2, | |
1152 | unsigned long arg3, | |
1153 | unsigned long arg4) = func; | |
1154 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
1155 | ||
1156 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
1157 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
1158 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
1159 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1160 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
1161 | ||
1162 | fptr(event_notifier, ret, args[0], args[1], args[2], args[3], args[4]); | |
1163 | } | |
8a8ac9a8 FD |
1164 | break; |
1165 | } | |
1166 | case 6: | |
1167 | { | |
1168 | void (*fptr)(void *__data, | |
1169 | long ret, | |
1170 | unsigned long arg0, | |
1171 | unsigned long arg1, | |
1172 | unsigned long arg2, | |
1173 | unsigned long arg3, | |
1174 | unsigned long arg4, | |
1175 | unsigned long arg5) = func; | |
1176 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
1177 | ||
1178 | lttng_syscall_get_arguments(current, regs, args); | |
a67ba386 MD |
1179 | lttng_hlist_for_each_entry_rcu(event_priv, dispatch_list, u.syscall.node) { |
1180 | struct lttng_kernel_event_notifier_private *event_notifier_priv = | |
1181 | container_of(event_priv, struct lttng_kernel_event_notifier_private, parent); | |
1182 | struct lttng_kernel_event_notifier *event_notifier = event_notifier_priv->pub; | |
1183 | ||
1184 | fptr(event_notifier, ret, args[0], args[1], args[2], args[3], args[4], args[5]); | |
1185 | } | |
8a8ac9a8 FD |
1186 | break; |
1187 | } | |
1188 | default: | |
1189 | break; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | static | |
1194 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
1195 | long ret) | |
1196 | { | |
1197 | struct lttng_event_notifier_group *group = __data; | |
1198 | const struct trace_syscall_entry *table, *entry; | |
1199 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
1200 | size_t table_len; | |
1201 | long id; | |
1202 | ||
1203 | id = syscall_get_nr(current, regs); | |
1204 | ||
1205 | if (unlikely(in_compat_syscall())) { | |
1206 | struct lttng_syscall_filter *filter = group->sc_filter; | |
1207 | ||
1208 | if (id < 0 || id >= NR_compat_syscalls | |
1209 | || (!READ_ONCE(group->syscall_all_exit) && | |
1210 | !test_bit(id, filter->sc_compat_exit))) { | |
1211 | /* System call filtered out. */ | |
1212 | return; | |
1213 | } | |
1214 | table = compat_sc_exit_table; | |
1215 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
1216 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
1217 | } else { | |
1218 | struct lttng_syscall_filter *filter = group->sc_filter; | |
1219 | ||
1220 | if (id < 0 || id >= NR_syscalls | |
1221 | || (!READ_ONCE(group->syscall_all_exit) && | |
1222 | !test_bit(id, filter->sc_exit))) { | |
1223 | /* System call filtered out. */ | |
1224 | return; | |
1225 | } | |
1226 | table = sc_exit_table; | |
1227 | table_len = ARRAY_SIZE(sc_exit_table); | |
1228 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
1229 | } | |
1230 | /* Check if the syscall id is out of bound. */ | |
1231 | if (unlikely(id < 0 || id >= table_len)) { | |
1232 | syscall_exit_event_notifier_unknown(unknown_dispatch_list, | |
1233 | regs, id, ret); | |
1234 | return; | |
1235 | } | |
1236 | ||
1237 | entry = &table[id]; | |
1238 | if (!entry->event_notifier_func) { | |
1239 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
1240 | regs, id); | |
1241 | return; | |
1242 | } | |
1243 | ||
1244 | if (unlikely(in_compat_syscall())) { | |
1245 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
1246 | } else { | |
1247 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
1248 | } | |
1249 | if (unlikely(hlist_empty(dispatch_list))) | |
1250 | return; | |
1251 | ||
1252 | syscall_exit_event_notifier_call_func(dispatch_list, | |
1253 | entry->event_notifier_func, entry->nrargs, regs, ret); | |
1254 | } | |
33a39a3c MD |
1255 | /* |
1256 | * noinline to diminish caller stack size. | |
1257 | * Should be called with sessions lock held. | |
1258 | */ | |
49c50022 | 1259 | static |
3b82c4e1 MD |
1260 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
1261 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
a67ba386 | 1262 | enum sc_type type) |
259b6cb3 | 1263 | { |
3b82c4e1 MD |
1264 | struct lttng_channel *chan = event_enabler->chan; |
1265 | struct lttng_session *session = chan->session; | |
259b6cb3 | 1266 | unsigned int i; |
49c50022 | 1267 | |
3b82c4e1 | 1268 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 1269 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 1270 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
606828e4 | 1271 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
1272 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
1273 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
1274 | struct hlist_head *head; |
1275 | bool found = false; | |
49c50022 MD |
1276 | |
1277 | if (!desc) { | |
1278 | /* Unknown syscall */ | |
1279 | continue; | |
1280 | } | |
3b82c4e1 MD |
1281 | if (lttng_desc_match_enabler(desc, |
1282 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
1283 | continue; | |
49c50022 | 1284 | /* |
3b82c4e1 | 1285 | * Check if already created. |
49c50022 | 1286 | */ |
3b82c4e1 MD |
1287 | head = utils_borrow_hash_table_bucket( |
1288 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
437d5aa5 | 1289 | desc->event_name); |
a67ba386 MD |
1290 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
1291 | if (event_recorder_priv->parent.desc == desc | |
1292 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3b82c4e1 MD |
1293 | found = true; |
1294 | } | |
1295 | if (found) | |
49c50022 | 1296 | continue; |
3b82c4e1 MD |
1297 | |
1298 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 1299 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
1300 | switch (type) { |
1301 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1302 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1303 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
1304 | break; |
1305 | case SC_TYPE_EXIT: | |
606828e4 MD |
1306 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1307 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
1308 | break; |
1309 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1310 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1311 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
1312 | break; |
1313 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1314 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1315 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
1316 | break; |
1317 | } | |
606828e4 MD |
1318 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
1319 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1320 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
a67ba386 MD |
1321 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, ev.instrumentation); |
1322 | WARN_ON_ONCE(!event_recorder); | |
1323 | if (IS_ERR(event_recorder)) { | |
49c50022 MD |
1324 | /* |
1325 | * If something goes wrong in event registration | |
1326 | * after the first one, we have no choice but to | |
1327 | * leave the previous events in there, until | |
1328 | * deleted by session teardown. | |
1329 | */ | |
a67ba386 | 1330 | return PTR_ERR(event_recorder); |
49c50022 | 1331 | } |
a67ba386 | 1332 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
1333 | } |
1334 | return 0; | |
1335 | } | |
1336 | ||
33a39a3c MD |
1337 | /* |
1338 | * Should be called with sessions lock held. | |
1339 | */ | |
a67ba386 | 1340 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler) |
49c50022 | 1341 | { |
3b82c4e1 | 1342 | struct lttng_channel *chan = event_enabler->chan; |
606828e4 | 1343 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
1344 | int ret; |
1345 | ||
263b6c88 | 1346 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
1347 | |
1348 | if (!chan->sc_table) { | |
1349 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 1350 | chan->sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
259b6cb3 MD |
1351 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
1352 | if (!chan->sc_table) | |
1353 | return -ENOMEM; | |
1354 | } | |
5b7ac358 MD |
1355 | if (!chan->sc_exit_table) { |
1356 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 1357 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
5b7ac358 MD |
1358 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); |
1359 | if (!chan->sc_exit_table) | |
1360 | return -ENOMEM; | |
1361 | } | |
1362 | ||
259b6cb3 | 1363 | |
49c50022 MD |
1364 | #ifdef CONFIG_COMPAT |
1365 | if (!chan->compat_sc_table) { | |
1366 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 1367 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
a93244f8 | 1368 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
1369 | if (!chan->compat_sc_table) |
1370 | return -ENOMEM; | |
1371 | } | |
5b7ac358 MD |
1372 | |
1373 | if (!chan->compat_sc_exit_table) { | |
1374 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 1375 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
5b7ac358 MD |
1376 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); |
1377 | if (!chan->compat_sc_exit_table) | |
1378 | return -ENOMEM; | |
1379 | } | |
49c50022 | 1380 | #endif |
3b82c4e1 | 1381 | if (hlist_empty(&chan->sc_unknown)) { |
437d5aa5 | 1382 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 1383 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 1384 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a | 1385 | |
f405cfce | 1386 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
1387 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1388 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1389 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1390 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
1391 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 1392 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1393 | ev.instrumentation); |
a67ba386 MD |
1394 | WARN_ON_ONCE(!event_recorder); |
1395 | if (IS_ERR(event_recorder)) { | |
1396 | return PTR_ERR(event_recorder); | |
f405cfce | 1397 | } |
a67ba386 | 1398 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_unknown); |
f405cfce MD |
1399 | } |
1400 | ||
3b82c4e1 | 1401 | if (hlist_empty(&chan->sc_compat_unknown)) { |
437d5aa5 | 1402 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 1403 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 1404 | struct lttng_kernel_event_recorder *event_recorder; |
b76dc1a0 MD |
1405 | |
1406 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1407 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1408 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1409 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1410 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
1411 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 1412 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1413 | ev.instrumentation); |
a67ba386 MD |
1414 | WARN_ON_ONCE(!event_recorder); |
1415 | if (IS_ERR(event_recorder)) { | |
1416 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 1417 | } |
a67ba386 | 1418 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_compat_unknown); |
b76dc1a0 MD |
1419 | } |
1420 | ||
3b82c4e1 | 1421 | if (hlist_empty(&chan->compat_sc_exit_unknown)) { |
437d5aa5 | 1422 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 1423 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 1424 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a MD |
1425 | |
1426 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1427 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1428 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1429 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1430 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
1431 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 1432 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1433 | ev.instrumentation); |
a67ba386 MD |
1434 | WARN_ON_ONCE(!event_recorder); |
1435 | if (IS_ERR(event_recorder)) { | |
1436 | return PTR_ERR(event_recorder); | |
5b7ac358 | 1437 | } |
a67ba386 | 1438 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->compat_sc_exit_unknown); |
5b7ac358 MD |
1439 | } |
1440 | ||
3b82c4e1 | 1441 | if (hlist_empty(&chan->sc_exit_unknown)) { |
437d5aa5 | 1442 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 1443 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 1444 | struct lttng_kernel_event_recorder *event_recorder; |
5b7ac358 MD |
1445 | |
1446 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1447 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1448 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1449 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1450 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
1451 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 1452 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1453 | ev.instrumentation); |
a67ba386 MD |
1454 | WARN_ON_ONCE(!event_recorder); |
1455 | if (IS_ERR(event_recorder)) { | |
1456 | return PTR_ERR(event_recorder); | |
2f804c0a | 1457 | } |
a67ba386 | 1458 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_exit_unknown); |
2f804c0a MD |
1459 | } |
1460 | ||
3b82c4e1 | 1461 | ret = lttng_create_syscall_event_if_missing(sc_table, ARRAY_SIZE(sc_table), |
a67ba386 | 1462 | chan->sc_table, event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
1463 | if (ret) |
1464 | return ret; | |
3b82c4e1 | 1465 | ret = lttng_create_syscall_event_if_missing(sc_exit_table, ARRAY_SIZE(sc_exit_table), |
a67ba386 | 1466 | chan->sc_exit_table, event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
1467 | if (ret) |
1468 | return ret; | |
5b7ac358 | 1469 | |
49c50022 | 1470 | #ifdef CONFIG_COMPAT |
3b82c4e1 | 1471 | ret = lttng_create_syscall_event_if_missing(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
a67ba386 | 1472 | chan->compat_sc_table, event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
1473 | if (ret) |
1474 | return ret; | |
3b82c4e1 | 1475 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
a67ba386 | 1476 | chan->compat_sc_exit_table, event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
1477 | if (ret) |
1478 | return ret; | |
1479 | #endif | |
badfe9f5 MD |
1480 | |
1481 | if (!chan->sc_filter) { | |
1482 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1483 | GFP_KERNEL); | |
1484 | if (!chan->sc_filter) | |
1485 | return -ENOMEM; | |
1486 | } | |
1487 | ||
80f87dd2 MD |
1488 | if (!chan->sys_enter_registered) { |
1489 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 1490 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1491 | if (ret) |
1492 | return ret; | |
1493 | chan->sys_enter_registered = 1; | |
1494 | } | |
63728b02 MD |
1495 | /* |
1496 | * We change the name of sys_exit tracepoint due to namespace | |
1497 | * conflict with sys_exit syscall entry. | |
1498 | */ | |
80f87dd2 MD |
1499 | if (!chan->sys_exit_registered) { |
1500 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 1501 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1502 | if (ret) { |
1503 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 1504 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
1505 | return ret; |
1506 | } | |
1507 | chan->sys_exit_registered = 1; | |
63728b02 | 1508 | } |
259b6cb3 MD |
1509 | return ret; |
1510 | } | |
1511 | ||
1512 | /* | |
8a8ac9a8 FD |
1513 | * Should be called with sessions lock held. |
1514 | */ | |
1515 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 1516 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
1517 | { |
1518 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1519 | unsigned int i; | |
1520 | int ret = 0; | |
1521 | ||
1522 | wrapper_vmalloc_sync_mappings(); | |
1523 | ||
1524 | if (!group->event_notifier_syscall_dispatch) { | |
1525 | group->event_notifier_syscall_dispatch = | |
1526 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1527 | GFP_KERNEL); | |
1528 | if (!group->event_notifier_syscall_dispatch) | |
1529 | return -ENOMEM; | |
1530 | ||
1531 | /* Initialize all list_head */ | |
1532 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1533 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); | |
1534 | ||
1535 | /* Init the unknown syscall notifier list. */ | |
1536 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
1537 | } | |
1538 | ||
1539 | if (!group->event_notifier_exit_syscall_dispatch) { | |
1540 | group->event_notifier_exit_syscall_dispatch = | |
1541 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1542 | GFP_KERNEL); | |
1543 | if (!group->event_notifier_exit_syscall_dispatch) | |
1544 | return -ENOMEM; | |
1545 | ||
1546 | /* Initialize all list_head */ | |
1547 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1548 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); | |
1549 | ||
1550 | /* Init the unknown exit syscall notifier list. */ | |
1551 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
1552 | } | |
1553 | ||
1554 | #ifdef CONFIG_COMPAT | |
1555 | if (!group->event_notifier_compat_syscall_dispatch) { | |
1556 | group->event_notifier_compat_syscall_dispatch = | |
1557 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_table), | |
1558 | GFP_KERNEL); | |
1559 | if (!group->event_notifier_syscall_dispatch) | |
1560 | return -ENOMEM; | |
1561 | ||
1562 | /* Initialize all list_head */ | |
1563 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) | |
1564 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); | |
1565 | ||
1566 | /* Init the unknown syscall notifier list. */ | |
1567 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
1568 | } | |
1569 | ||
1570 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
1571 | group->event_notifier_exit_compat_syscall_dispatch = | |
1572 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_exit_table), | |
1573 | GFP_KERNEL); | |
1574 | if (!group->event_notifier_exit_syscall_dispatch) | |
1575 | return -ENOMEM; | |
1576 | ||
1577 | /* Initialize all list_head */ | |
1578 | for (i = 0; i < ARRAY_SIZE(compat_sc_exit_table); i++) | |
1579 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); | |
1580 | ||
1581 | /* Init the unknown exit syscall notifier list. */ | |
1582 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
1583 | } | |
1584 | #endif | |
1585 | ||
1586 | if (!group->sc_filter) { | |
1587 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1588 | GFP_KERNEL); | |
1589 | if (!group->sc_filter) | |
1590 | return -ENOMEM; | |
1591 | } | |
1592 | ||
1593 | if (!group->sys_enter_registered) { | |
1594 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
1595 | (void *) syscall_entry_event_notifier_probe, group); | |
1596 | if (ret) | |
1597 | return ret; | |
1598 | group->sys_enter_registered = 1; | |
1599 | } | |
1600 | ||
1601 | if (!group->sys_exit_registered) { | |
1602 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
1603 | (void *) syscall_exit_event_notifier_probe, group); | |
1604 | if (ret) { | |
1605 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1606 | (void *) syscall_entry_event_notifier_probe, group)); | |
1607 | return ret; | |
1608 | } | |
1609 | group->sys_exit_registered = 1; | |
1610 | } | |
1611 | ||
1612 | return ret; | |
1613 | } | |
1614 | ||
1615 | static | |
1616 | int create_unknown_event_notifier( | |
1617 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1618 | enum sc_type type) | |
1619 | { | |
a67ba386 MD |
1620 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1621 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 1622 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1623 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
606828e4 | 1624 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 | 1625 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1626 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1627 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
1628 | event_notifier_enabler); | |
1629 | struct hlist_head *unknown_dispatch_list; | |
1630 | int ret = 0; | |
1631 | bool found = false; | |
606828e4 MD |
1632 | enum lttng_kernel_abi_syscall_abi abi; |
1633 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
1634 | struct hlist_head *head; |
1635 | ||
1636 | switch (type) { | |
1637 | case SC_TYPE_ENTRY: | |
1638 | desc = &__event_desc___syscall_entry_unknown; | |
1639 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
606828e4 MD |
1640 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1641 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1642 | break; |
1643 | case SC_TYPE_EXIT: | |
1644 | desc = &__event_desc___syscall_exit_unknown; | |
1645 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
606828e4 MD |
1646 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1647 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1648 | break; |
1649 | case SC_TYPE_COMPAT_ENTRY: | |
1650 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1651 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1652 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1653 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1654 | break; |
1655 | case SC_TYPE_COMPAT_EXIT: | |
1656 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1657 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1658 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1659 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1660 | break; |
1661 | default: | |
1662 | BUG_ON(1); | |
1663 | } | |
1664 | ||
1665 | /* | |
1666 | * Check if already created. | |
1667 | */ | |
1668 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1669 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1670 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1671 | if (event_notifier_priv->parent.desc == desc && | |
1672 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
1673 | found = true; |
1674 | } | |
1675 | if (found) | |
1676 | goto end; | |
1677 | ||
1678 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 1679 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 1680 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 1681 | |
606828e4 | 1682 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 1683 | |
606828e4 | 1684 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
1685 | event_notifier_param.event.u.syscall.abi = abi; |
1686 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1687 | ||
a67ba386 MD |
1688 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1689 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 1690 | event_notifier_param.event.instrumentation); |
a67ba386 | 1691 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 1692 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 1693 | desc->event_name); |
8a8ac9a8 FD |
1694 | ret = -ENOMEM; |
1695 | goto end; | |
1696 | } | |
1697 | ||
a67ba386 | 1698 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
1699 | |
1700 | end: | |
1701 | return ret; | |
1702 | } | |
1703 | ||
1704 | static int create_matching_event_notifiers( | |
1705 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 1706 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
1707 | size_t table_len, enum sc_type type) |
1708 | { | |
1709 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 1710 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1711 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1712 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1713 | unsigned int i; |
1714 | int ret = 0; | |
1715 | ||
1716 | /* iterate over all syscall and create event_notifier that match */ | |
1717 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
1718 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1719 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 1720 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
1721 | struct hlist_head *head; |
1722 | int found = 0; | |
1723 | ||
1724 | desc = table[i].desc; | |
1725 | if (!desc) { | |
1726 | /* Unknown syscall */ | |
1727 | continue; | |
1728 | } | |
1729 | ||
1730 | if (!lttng_desc_match_enabler(desc, | |
1731 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1732 | continue; | |
1733 | ||
1734 | /* | |
1735 | * Check if already created. | |
1736 | */ | |
1737 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1738 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1739 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1740 | if (event_notifier_priv->parent.desc == desc | |
1741 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
8a8ac9a8 FD |
1742 | found = 1; |
1743 | } | |
1744 | if (found) | |
1745 | continue; | |
1746 | ||
1747 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1748 | switch (type) { | |
1749 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1750 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1751 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1752 | break; |
1753 | case SC_TYPE_EXIT: | |
606828e4 MD |
1754 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1755 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1756 | break; |
1757 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1758 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1759 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1760 | break; |
1761 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1762 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1763 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1764 | break; |
1765 | } | |
437d5aa5 | 1766 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1767 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1768 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1769 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1770 | |
99f52fcc FD |
1771 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1772 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1773 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1774 | if (IS_ERR(event_notifier)) { |
1775 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1776 | desc->event_name); |
8a8ac9a8 FD |
1777 | ret = -ENOMEM; |
1778 | goto end; | |
1779 | } | |
1780 | ||
a67ba386 | 1781 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1782 | } |
1783 | ||
1784 | end: | |
1785 | return ret; | |
1786 | ||
1787 | } | |
1788 | ||
a67ba386 MD |
1789 | int lttng_syscalls_create_matching_event_notifiers( |
1790 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1791 | { |
1792 | int ret; | |
1793 | struct lttng_enabler *base_enabler = | |
1794 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
606828e4 | 1795 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1796 | base_enabler->event_param.u.syscall.entryexit; |
1797 | ||
606828e4 | 1798 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1799 | ret = create_matching_event_notifiers(event_notifier_enabler, |
a67ba386 | 1800 | sc_table, ARRAY_SIZE(sc_table), SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1801 | if (ret) |
1802 | goto end; | |
1803 | ||
1804 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
a67ba386 | 1805 | compat_sc_table, ARRAY_SIZE(compat_sc_table), |
8a8ac9a8 FD |
1806 | SC_TYPE_COMPAT_ENTRY); |
1807 | if (ret) | |
1808 | goto end; | |
1809 | ||
1810 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1811 | SC_TYPE_ENTRY); | |
1812 | if (ret) | |
1813 | goto end; | |
1814 | ||
1815 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1816 | SC_TYPE_COMPAT_ENTRY); | |
1817 | if (ret) | |
1818 | goto end; | |
1819 | } | |
1820 | ||
606828e4 | 1821 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1822 | ret = create_matching_event_notifiers(event_notifier_enabler, |
a67ba386 | 1823 | sc_exit_table, ARRAY_SIZE(sc_exit_table), |
8a8ac9a8 FD |
1824 | SC_TYPE_EXIT); |
1825 | if (ret) | |
1826 | goto end; | |
1827 | ||
1828 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1829 | SC_TYPE_EXIT); | |
1830 | if (ret) | |
1831 | goto end; | |
1832 | ||
1833 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
a67ba386 | 1834 | compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
8a8ac9a8 FD |
1835 | SC_TYPE_COMPAT_EXIT); |
1836 | if (ret) | |
1837 | goto end; | |
1838 | ||
1839 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1840 | SC_TYPE_COMPAT_EXIT); | |
1841 | if (ret) | |
1842 | goto end; | |
1843 | } | |
1844 | ||
1845 | end: | |
1846 | return ret; | |
1847 | } | |
1848 | ||
1849 | /* | |
1850 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1851 | */ |
3b82c4e1 | 1852 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1853 | struct lttng_event_notifier_group *event_notifier_group) |
1854 | { | |
1855 | int ret; | |
1856 | ||
1857 | /* | |
1858 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1859 | * At the moment, we don't think it's desirable to have one fired | |
1860 | * event_notifier for the entry and one for the exit of a syscall. | |
1861 | */ | |
1862 | if (event_notifier_group->sys_enter_registered) { | |
1863 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1864 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1865 | if (ret) | |
1866 | return ret; | |
1867 | event_notifier_group->sys_enter_registered = 0; | |
1868 | } | |
1869 | if (event_notifier_group->sys_exit_registered) { | |
1870 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1871 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1872 | if (ret) | |
1873 | return ret; | |
1874 | event_notifier_group->sys_enter_registered = 0; | |
1875 | } | |
1876 | ||
1877 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1878 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1879 | #ifdef CONFIG_COMPAT | |
1880 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1881 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1882 | #endif | |
1883 | return 0; | |
1884 | } | |
1885 | ||
3b82c4e1 | 1886 | int lttng_syscalls_unregister_channel(struct lttng_channel *chan) |
259b6cb3 MD |
1887 | { |
1888 | int ret; | |
1889 | ||
1890 | if (!chan->sc_table) | |
1891 | return 0; | |
80f87dd2 | 1892 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1893 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1894 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1895 | if (ret) |
1896 | return ret; | |
1897 | chan->sys_enter_registered = 0; | |
1898 | } | |
1899 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1900 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1901 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1902 | if (ret) |
1903 | return ret; | |
1904 | chan->sys_exit_registered = 0; | |
1905 | } | |
badfe9f5 MD |
1906 | return 0; |
1907 | } | |
1908 | ||
2d6d88c6 | 1909 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 1910 | { |
259b6cb3 | 1911 | kfree(chan->sc_table); |
5b7ac358 | 1912 | kfree(chan->sc_exit_table); |
49c50022 MD |
1913 | #ifdef CONFIG_COMPAT |
1914 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1915 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1916 | #endif |
80f87dd2 MD |
1917 | kfree(chan->sc_filter); |
1918 | return 0; | |
1919 | } | |
1920 | ||
1921 | static | |
1922 | int get_syscall_nr(const char *syscall_name) | |
1923 | { | |
1924 | int syscall_nr = -1; | |
1925 | int i; | |
1926 | ||
1927 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
1928 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1929 | const char *it_name; |
80f87dd2 MD |
1930 | |
1931 | entry = &sc_table[i]; | |
1932 | if (!entry->desc) | |
1933 | continue; | |
437d5aa5 | 1934 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1935 | it_name += strlen(SYSCALL_ENTRY_STR); |
1936 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1937 | syscall_nr = i; |
1938 | break; | |
1939 | } | |
1940 | } | |
1941 | return syscall_nr; | |
1942 | } | |
1943 | ||
1944 | static | |
1945 | int get_compat_syscall_nr(const char *syscall_name) | |
1946 | { | |
1947 | int syscall_nr = -1; | |
1948 | int i; | |
1949 | ||
1950 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
1951 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1952 | const char *it_name; |
80f87dd2 MD |
1953 | |
1954 | entry = &compat_sc_table[i]; | |
1955 | if (!entry->desc) | |
1956 | continue; | |
437d5aa5 | 1957 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1958 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1959 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1960 | syscall_nr = i; |
1961 | break; | |
1962 | } | |
1963 | } | |
1964 | return syscall_nr; | |
1965 | } | |
1966 | ||
12e579db MD |
1967 | static |
1968 | uint32_t get_sc_tables_len(void) | |
1969 | { | |
1970 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1971 | } | |
1972 | ||
badfe9f5 | 1973 | static |
ade8a729 FD |
1974 | const char *get_syscall_name(const char *desc_name, |
1975 | enum lttng_syscall_abi abi, | |
1976 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1977 | { |
badfe9f5 | 1978 | size_t prefix_len = 0; |
80f87dd2 | 1979 | |
80f87dd2 | 1980 | |
ade8a729 | 1981 | switch (entryexit) { |
badfe9f5 | 1982 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1983 | switch (abi) { |
badfe9f5 MD |
1984 | case LTTNG_SYSCALL_ABI_NATIVE: |
1985 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1986 | break; | |
1987 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1988 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1989 | break; | |
80f87dd2 | 1990 | } |
badfe9f5 MD |
1991 | break; |
1992 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1993 | switch (abi) { |
badfe9f5 MD |
1994 | case LTTNG_SYSCALL_ABI_NATIVE: |
1995 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1996 | break; | |
1997 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1998 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1999 | break; | |
80f87dd2 | 2000 | } |
badfe9f5 | 2001 | break; |
80f87dd2 | 2002 | } |
badfe9f5 | 2003 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 2004 | return desc_name + prefix_len; |
badfe9f5 MD |
2005 | } |
2006 | ||
ade8a729 FD |
2007 | static |
2008 | int lttng_syscall_filter_enable( | |
2009 | struct lttng_syscall_filter *filter, | |
2010 | const char *desc_name, enum lttng_syscall_abi abi, | |
2011 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 2012 | { |
badfe9f5 MD |
2013 | const char *syscall_name; |
2014 | unsigned long *bitmap; | |
2015 | int syscall_nr; | |
2016 | ||
ade8a729 | 2017 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 2018 | |
ade8a729 | 2019 | switch (abi) { |
badfe9f5 MD |
2020 | case LTTNG_SYSCALL_ABI_NATIVE: |
2021 | syscall_nr = get_syscall_nr(syscall_name); | |
2022 | break; | |
2023 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2024 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
2025 | break; | |
2026 | default: | |
2027 | return -EINVAL; | |
80f87dd2 | 2028 | } |
badfe9f5 MD |
2029 | if (syscall_nr < 0) |
2030 | return -ENOENT; | |
2031 | ||
ade8a729 | 2032 | switch (entryexit) { |
badfe9f5 | 2033 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 2034 | switch (abi) { |
badfe9f5 MD |
2035 | case LTTNG_SYSCALL_ABI_NATIVE: |
2036 | bitmap = filter->sc_entry; | |
2037 | break; | |
2038 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2039 | bitmap = filter->sc_compat_entry; | |
2040 | break; | |
6d9694d8 MD |
2041 | default: |
2042 | return -EINVAL; | |
80f87dd2 | 2043 | } |
badfe9f5 MD |
2044 | break; |
2045 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 2046 | switch (abi) { |
badfe9f5 MD |
2047 | case LTTNG_SYSCALL_ABI_NATIVE: |
2048 | bitmap = filter->sc_exit; | |
2049 | break; | |
2050 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2051 | bitmap = filter->sc_compat_exit; | |
2052 | break; | |
6d9694d8 MD |
2053 | default: |
2054 | return -EINVAL; | |
80f87dd2 | 2055 | } |
badfe9f5 MD |
2056 | break; |
2057 | default: | |
2058 | return -EINVAL; | |
80f87dd2 | 2059 | } |
badfe9f5 MD |
2060 | if (test_bit(syscall_nr, bitmap)) |
2061 | return -EEXIST; | |
2062 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 2063 | return 0; |
80f87dd2 MD |
2064 | } |
2065 | ||
8a8ac9a8 | 2066 | int lttng_syscall_filter_enable_event_notifier( |
a67ba386 | 2067 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 2068 | { |
a67ba386 MD |
2069 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
2070 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; | |
8a8ac9a8 FD |
2071 | struct hlist_head *dispatch_list; |
2072 | int ret = 0; | |
2073 | ||
a67ba386 | 2074 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
2075 | |
2076 | ret = lttng_syscall_filter_enable(group->sc_filter, | |
a67ba386 MD |
2077 | event_notifier->priv->parent.desc->event_name, |
2078 | event_notifier->priv->parent.u.syscall.abi, | |
2079 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
2080 | if (ret) { |
2081 | goto end; | |
2082 | } | |
2083 | ||
a67ba386 | 2084 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 2085 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 2086 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
2087 | case LTTNG_SYSCALL_ABI_NATIVE: |
2088 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
2089 | break; | |
2090 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2091 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
2092 | break; | |
6866b1c7 MJ |
2093 | default: |
2094 | ret = -EINVAL; | |
2095 | goto end; | |
8a8ac9a8 FD |
2096 | } |
2097 | break; | |
2098 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 2099 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
2100 | case LTTNG_SYSCALL_ABI_NATIVE: |
2101 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
2102 | break; | |
2103 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2104 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
2105 | break; | |
6866b1c7 MJ |
2106 | default: |
2107 | ret = -EINVAL; | |
2108 | goto end; | |
8a8ac9a8 FD |
2109 | } |
2110 | break; | |
6866b1c7 MJ |
2111 | default: |
2112 | ret = -EINVAL; | |
2113 | goto end; | |
8a8ac9a8 FD |
2114 | } |
2115 | ||
a67ba386 | 2116 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
2117 | |
2118 | end: | |
2119 | return ret ; | |
2120 | } | |
2121 | ||
ade8a729 FD |
2122 | int lttng_syscall_filter_enable_event( |
2123 | struct lttng_channel *channel, | |
a67ba386 | 2124 | struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 2125 | { |
a67ba386 | 2126 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 FD |
2127 | |
2128 | return lttng_syscall_filter_enable(channel->sc_filter, | |
a67ba386 MD |
2129 | event_recorder->priv->parent.desc->event_name, |
2130 | event_recorder->priv->parent.u.syscall.abi, | |
2131 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
2132 | } |
2133 | ||
2134 | static | |
2135 | int lttng_syscall_filter_disable( | |
2136 | struct lttng_syscall_filter *filter, | |
2137 | const char *desc_name, enum lttng_syscall_abi abi, | |
2138 | enum lttng_syscall_entryexit entryexit) | |
2139 | { | |
badfe9f5 MD |
2140 | const char *syscall_name; |
2141 | unsigned long *bitmap; | |
2142 | int syscall_nr; | |
80f87dd2 | 2143 | |
ade8a729 | 2144 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 2145 | |
ade8a729 | 2146 | switch (abi) { |
badfe9f5 MD |
2147 | case LTTNG_SYSCALL_ABI_NATIVE: |
2148 | syscall_nr = get_syscall_nr(syscall_name); | |
2149 | break; | |
2150 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2151 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
2152 | break; | |
2153 | default: | |
2154 | return -EINVAL; | |
80f87dd2 | 2155 | } |
badfe9f5 MD |
2156 | if (syscall_nr < 0) |
2157 | return -ENOENT; | |
80f87dd2 | 2158 | |
ade8a729 | 2159 | switch (entryexit) { |
badfe9f5 | 2160 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 2161 | switch (abi) { |
badfe9f5 MD |
2162 | case LTTNG_SYSCALL_ABI_NATIVE: |
2163 | bitmap = filter->sc_entry; | |
2164 | break; | |
2165 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2166 | bitmap = filter->sc_compat_entry; | |
2167 | break; | |
6d9694d8 MD |
2168 | default: |
2169 | return -EINVAL; | |
80f87dd2 | 2170 | } |
badfe9f5 MD |
2171 | break; |
2172 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 2173 | switch (abi) { |
badfe9f5 MD |
2174 | case LTTNG_SYSCALL_ABI_NATIVE: |
2175 | bitmap = filter->sc_exit; | |
2176 | break; | |
2177 | case LTTNG_SYSCALL_ABI_COMPAT: | |
2178 | bitmap = filter->sc_compat_exit; | |
2179 | break; | |
6d9694d8 MD |
2180 | default: |
2181 | return -EINVAL; | |
80f87dd2 | 2182 | } |
badfe9f5 MD |
2183 | break; |
2184 | default: | |
2185 | return -EINVAL; | |
80f87dd2 | 2186 | } |
badfe9f5 MD |
2187 | if (!test_bit(syscall_nr, bitmap)) |
2188 | return -EEXIST; | |
2189 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 2190 | |
badfe9f5 | 2191 | return 0; |
259b6cb3 | 2192 | } |
2d2464bd | 2193 | |
8a8ac9a8 | 2194 | int lttng_syscall_filter_disable_event_notifier( |
a67ba386 | 2195 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 2196 | { |
a67ba386 | 2197 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
8a8ac9a8 FD |
2198 | int ret; |
2199 | ||
a67ba386 | 2200 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
2201 | |
2202 | ret = lttng_syscall_filter_disable(group->sc_filter, | |
a67ba386 MD |
2203 | event_notifier->priv->parent.desc->event_name, |
2204 | event_notifier->priv->parent.u.syscall.abi, | |
2205 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
2206 | WARN_ON_ONCE(ret != 0); |
2207 | ||
a67ba386 | 2208 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
2209 | return 0; |
2210 | } | |
2211 | ||
ade8a729 FD |
2212 | int lttng_syscall_filter_disable_event( |
2213 | struct lttng_channel *channel, | |
a67ba386 | 2214 | struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 FD |
2215 | { |
2216 | return lttng_syscall_filter_disable(channel->sc_filter, | |
a67ba386 MD |
2217 | event_recorder->priv->parent.desc->event_name, |
2218 | event_recorder->priv->parent.u.syscall.abi, | |
2219 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
2220 | } |
2221 | ||
2d2464bd MD |
2222 | static |
2223 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
2224 | { | |
2225 | const struct trace_syscall_entry *entry; | |
2226 | int iter = 0; | |
2227 | ||
2228 | for (entry = sc_table; | |
2229 | entry < sc_table + ARRAY_SIZE(sc_table); | |
2230 | entry++) { | |
2231 | if (iter++ >= *pos) | |
2232 | return entry; | |
2233 | } | |
2234 | for (entry = compat_sc_table; | |
2235 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
2236 | entry++) { | |
2237 | if (iter++ >= *pos) | |
2238 | return entry; | |
2239 | } | |
2240 | /* End of list */ | |
2241 | return NULL; | |
2242 | } | |
2243 | ||
2244 | static | |
2245 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
2246 | { | |
2247 | return (void *) syscall_list_get_entry(pos); | |
2248 | } | |
2249 | ||
2250 | static | |
2251 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
2252 | { | |
2253 | (*ppos)++; | |
2254 | return (void *) syscall_list_get_entry(ppos); | |
2255 | } | |
2256 | ||
2257 | static | |
2258 | void syscall_list_stop(struct seq_file *m, void *p) | |
2259 | { | |
2260 | } | |
2261 | ||
12e579db MD |
2262 | static |
2263 | int get_sc_table(const struct trace_syscall_entry *entry, | |
2264 | const struct trace_syscall_entry **table, | |
2265 | unsigned int *bitness) | |
2266 | { | |
2267 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
2268 | if (bitness) | |
2269 | *bitness = BITS_PER_LONG; | |
2270 | if (table) | |
2271 | *table = sc_table; | |
2272 | return 0; | |
2273 | } | |
2274 | if (!(entry >= compat_sc_table | |
2275 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
2276 | return -EINVAL; | |
2277 | } | |
2278 | if (bitness) | |
2279 | *bitness = 32; | |
2280 | if (table) | |
2281 | *table = compat_sc_table; | |
2282 | return 0; | |
2283 | } | |
2284 | ||
2d2464bd MD |
2285 | static |
2286 | int syscall_list_show(struct seq_file *m, void *p) | |
2287 | { | |
2288 | const struct trace_syscall_entry *table, *entry = p; | |
2289 | unsigned int bitness; | |
d4291869 | 2290 | unsigned long index; |
12e579db | 2291 | int ret; |
d4291869 | 2292 | const char *name; |
2d2464bd | 2293 | |
12e579db MD |
2294 | ret = get_sc_table(entry, &table, &bitness); |
2295 | if (ret) | |
2296 | return ret; | |
f4855b46 MD |
2297 | if (!entry->desc) |
2298 | return 0; | |
d4291869 MD |
2299 | if (table == sc_table) { |
2300 | index = entry - table; | |
437d5aa5 | 2301 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 MD |
2302 | } else { |
2303 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
437d5aa5 | 2304 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 2305 | } |
12e579db | 2306 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 2307 | index, name, bitness); |
2d2464bd MD |
2308 | return 0; |
2309 | } | |
2310 | ||
2311 | static | |
2312 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
2313 | .start = syscall_list_start, | |
2314 | .next = syscall_list_next, | |
2315 | .stop = syscall_list_stop, | |
2316 | .show = syscall_list_show, | |
2317 | }; | |
2318 | ||
2319 | static | |
2320 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
2321 | { | |
2322 | return seq_open(file, <tng_syscall_list_seq_ops); | |
2323 | } | |
2324 | ||
2325 | const struct file_operations lttng_syscall_list_fops = { | |
2326 | .owner = THIS_MODULE, | |
2327 | .open = lttng_syscall_list_open, | |
2328 | .read = seq_read, | |
2329 | .llseek = seq_lseek, | |
2330 | .release = seq_release, | |
2331 | }; | |
12e579db | 2332 | |
badfe9f5 MD |
2333 | /* |
2334 | * A syscall is enabled if it is traced for either entry or exit. | |
2335 | */ | |
12e579db | 2336 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
606828e4 | 2337 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
2338 | { |
2339 | uint32_t len, sc_tables_len, bitmask_len; | |
2340 | int ret = 0, bit; | |
2341 | char *tmp_mask; | |
2342 | struct lttng_syscall_filter *filter; | |
2343 | ||
2344 | ret = get_user(len, &usyscall_mask->len); | |
2345 | if (ret) | |
2346 | return ret; | |
2347 | sc_tables_len = get_sc_tables_len(); | |
2348 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
2349 | if (len < sc_tables_len) { | |
2350 | return put_user(sc_tables_len, &usyscall_mask->len); | |
2351 | } | |
2352 | /* Array is large enough, we can copy array to user-space. */ | |
2353 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
2354 | if (!tmp_mask) | |
2355 | return -ENOMEM; | |
2356 | filter = channel->sc_filter; | |
2357 | ||
2358 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 2359 | char state; |
2f25059d MD |
2360 | |
2361 | if (channel->sc_table) { | |
3b82c4e1 MD |
2362 | if (!(READ_ONCE(channel->syscall_all_entry) |
2363 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
badfe9f5 MD |
2364 | state = test_bit(bit, filter->sc_entry) |
2365 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
2366 | else |
2367 | state = 1; | |
2368 | } else { | |
2369 | state = 0; | |
2370 | } | |
2371 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
2372 | } |
2373 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 2374 | char state; |
2f25059d MD |
2375 | |
2376 | if (channel->compat_sc_table) { | |
3b82c4e1 MD |
2377 | if (!(READ_ONCE(channel->syscall_all_entry) |
2378 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
2f25059d | 2379 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
badfe9f5 MD |
2380 | filter->sc_compat_entry) |
2381 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
2382 | filter->sc_compat_exit); | |
2f25059d MD |
2383 | else |
2384 | state = 1; | |
2385 | } else { | |
2386 | state = 0; | |
2387 | } | |
2388 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
2389 | } |
2390 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
2391 | ret = -EFAULT; | |
2392 | kfree(tmp_mask); | |
2393 | return ret; | |
2394 | } | |
082d4946 MD |
2395 | |
2396 | int lttng_abi_syscall_list(void) | |
2397 | { | |
2398 | struct file *syscall_list_file; | |
2399 | int file_fd, ret; | |
2400 | ||
4ac10b76 | 2401 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
2402 | if (file_fd < 0) { |
2403 | ret = file_fd; | |
2404 | goto fd_error; | |
2405 | } | |
2406 | ||
2407 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
2408 | <tng_syscall_list_fops, | |
2409 | NULL, O_RDWR); | |
2410 | if (IS_ERR(syscall_list_file)) { | |
2411 | ret = PTR_ERR(syscall_list_file); | |
2412 | goto file_error; | |
2413 | } | |
2414 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
2415 | if (ret < 0) | |
2416 | goto open_error; | |
2417 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
2418 | return file_fd; |
2419 | ||
2420 | open_error: | |
2421 | fput(syscall_list_file); | |
2422 | file_error: | |
2423 | put_unused_fd(file_fd); | |
2424 | fd_error: | |
2425 | return ret; | |
2426 | } |