Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
259b6cb3 MD |
3 | * lttng-syscalls.c |
4 | * | |
2faf7d1b | 5 | * LTTng syscall probes. |
259b6cb3 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
259b6cb3 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
6333ace3 | 12 | #include <linux/compat.h> |
abc0446a | 13 | #include <linux/err.h> |
80f87dd2 | 14 | #include <linux/bitmap.h> |
7ca580f8 MD |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
2d2464bd | 17 | #include <linux/seq_file.h> |
d4291869 | 18 | #include <linux/stringify.h> |
082d4946 MD |
19 | #include <linux/file.h> |
20 | #include <linux/anon_inodes.h> | |
c8dfb724 | 21 | #include <linux/fcntl.h> |
3cf55950 | 22 | #include <linux/mman.h> |
259b6cb3 MD |
23 | #include <asm/ptrace.h> |
24 | #include <asm/syscall.h> | |
25 | ||
a071f25d | 26 | #include <lttng/bitfield.h> |
241ae9a8 MD |
27 | #include <wrapper/tracepoint.h> |
28 | #include <wrapper/file.h> | |
29 | #include <wrapper/rcu.h> | |
1b7b9c65 | 30 | #include <wrapper/syscall.h> |
2df37e95 | 31 | #include <lttng/events.h> |
8a8ac9a8 | 32 | #include <lttng/utils.h> |
259b6cb3 | 33 | |
6333ace3 | 34 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
35 | # ifndef is_compat_task |
36 | # define is_compat_task() (0) | |
37 | # endif | |
6333ace3 MD |
38 | #endif |
39 | ||
1aa3298b MD |
40 | /* in_compat_syscall appears in kernel 4.6. */ |
41 | #ifndef in_compat_syscall | |
42 | #define in_compat_syscall() is_compat_task() | |
43 | #endif | |
44 | ||
5b7ac358 MD |
45 | enum sc_type { |
46 | SC_TYPE_ENTRY, | |
47 | SC_TYPE_EXIT, | |
48 | SC_TYPE_COMPAT_ENTRY, | |
49 | SC_TYPE_COMPAT_EXIT, | |
50 | }; | |
51 | ||
d4291869 MD |
52 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
53 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
54 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
55 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
56 | ||
57 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
58 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
59 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
60 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 61 | |
a93244f8 | 62 | static |
2d6d88c6 | 63 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 | 64 | static |
2d6d88c6 | 65 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 66 | |
8a8ac9a8 FD |
67 | static |
68 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, | |
69 | long id); | |
70 | static | |
71 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
72 | long ret); | |
73 | ||
3a523f5b MD |
74 | /* |
75 | * Forward declarations for old kernels. | |
76 | */ | |
77 | struct mmsghdr; | |
78 | struct rlimit64; | |
79 | struct oldold_utsname; | |
80 | struct old_utsname; | |
81 | struct sel_arg_struct; | |
82 | struct mmap_arg_struct; | |
c0b71117 | 83 | struct file_handle; |
a292e6f1 | 84 | struct user_msghdr; |
3a523f5b | 85 | |
9eb15e8b MJ |
86 | /* |
87 | * Forward declaration for kernels >= 5.6 | |
88 | */ | |
89 | struct timex; | |
edfdcb68 MJ |
90 | struct timeval; |
91 | struct itimerval; | |
92 | struct itimerspec; | |
93 | ||
94 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
95 | typedef __kernel_old_time_t time_t; | |
96 | #endif | |
9eb15e8b | 97 | |
80f87dd2 MD |
98 | #ifdef IA32_NR_syscalls |
99 | #define NR_compat_syscalls IA32_NR_syscalls | |
100 | #else | |
101 | #define NR_compat_syscalls NR_syscalls | |
102 | #endif | |
103 | ||
259b6cb3 MD |
104 | /* |
105 | * Create LTTng tracepoint probes. | |
106 | */ | |
107 | #define LTTNG_PACKAGE_BUILD | |
108 | #define CREATE_TRACE_POINTS | |
2655f9ad | 109 | #define TP_MODULE_NOINIT |
c075712b | 110 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 111 | |
a93244f8 MD |
112 | #define PARAMS(args...) args |
113 | ||
5b7ac358 | 114 | /* Handle unknown syscalls */ |
72a52753 | 115 | #undef TRACE_SYSTEM |
5b7ac358 | 116 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 117 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
118 | #undef TRACE_SYSTEM |
119 | ||
fc4f7161 MD |
120 | #define SC_ENTER |
121 | ||
fc4f7161 MD |
122 | #undef sc_exit |
123 | #define sc_exit(...) | |
b75d00c4 MD |
124 | #undef sc_in |
125 | #define sc_in(...) __VA_ARGS__ | |
126 | #undef sc_out | |
127 | #define sc_out(...) | |
128 | #undef sc_inout | |
129 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
130 | |
131 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 132 | #undef TP_PROBE_CB |
2d6d88c6 | 133 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
57ede728 | 134 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 135 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 136 | PARAMS(_fields)) |
265822ae | 137 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 138 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
139 | PARAMS(_locvar), PARAMS(_code_pre), \ |
140 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
141 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
142 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 143 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 144 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
145 | /* Enumerations only defined at first inclusion. */ |
146 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
147 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 148 | #undef TRACE_SYSTEM |
d4291869 | 149 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 150 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 151 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 152 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 153 | #undef TRACE_SYSTEM |
d4291869 | 154 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 155 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 156 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 157 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 158 | #undef TRACE_SYSTEM |
141ddf28 | 159 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
160 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
161 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
162 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
163 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 164 | #undef TP_PROBE_CB |
3bc29f0a MD |
165 | #undef _TRACE_SYSCALLS_INTEGERS_H |
166 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
167 | |
168 | /* Hijack probe callback for compat system call enter */ | |
2d6d88c6 | 169 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
771af27e | 170 | #define LTTNG_SC_COMPAT |
57ede728 | 171 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 172 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 173 | PARAMS(_fields)) |
265822ae | 174 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 175 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 176 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
177 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
178 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 179 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
180 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
181 | compat_syscall_entry_##_name) | |
141ddf28 MD |
182 | /* Enumerations only defined at inital inclusion (not here). */ |
183 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 184 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 185 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 186 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
187 | #undef TRACE_INCLUDE_FILE |
188 | #undef TRACE_SYSTEM | |
d4291869 | 189 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 190 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 191 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
192 | #undef TRACE_INCLUDE_FILE |
193 | #undef TRACE_SYSTEM | |
141ddf28 | 194 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
195 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
196 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
197 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
198 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 199 | #undef TP_PROBE_CB |
3bc29f0a MD |
200 | #undef _TRACE_SYSCALLS_INTEGERS_H |
201 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 202 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 203 | |
fc4f7161 MD |
204 | #undef SC_ENTER |
205 | ||
206 | #define SC_EXIT | |
207 | ||
fc4f7161 MD |
208 | #undef sc_exit |
209 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
210 | #undef sc_in |
211 | #define sc_in(...) | |
212 | #undef sc_out | |
213 | #define sc_out(...) __VA_ARGS__ | |
214 | #undef sc_inout | |
215 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
216 | |
217 | /* Hijack probe callback for system call exit */ | |
2d6d88c6 | 218 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
57ede728 | 219 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 220 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 221 | PARAMS(_fields)) |
265822ae | 222 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 223 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 224 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
225 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
226 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
227 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
228 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 229 | syscall_exit_##_name) |
141ddf28 MD |
230 | /* Enumerations only defined at inital inclusion (not here). */ |
231 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
232 | #define TRACE_SYSTEM syscall_exit_integers |
233 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 234 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
235 | #undef TRACE_INCLUDE_FILE |
236 | #undef TRACE_SYSTEM | |
237 | #define TRACE_SYSTEM syscall_exit_pointers | |
238 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 239 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
240 | #undef TRACE_INCLUDE_FILE |
241 | #undef TRACE_SYSTEM | |
141ddf28 | 242 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
243 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
244 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
245 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
246 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 247 | #undef TP_PROBE_CB |
3bc29f0a MD |
248 | #undef _TRACE_SYSCALLS_INTEGERS_H |
249 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
250 | |
251 | ||
252 | /* Hijack probe callback for compat system call exit */ | |
2d6d88c6 | 253 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
771af27e | 254 | #define LTTNG_SC_COMPAT |
57ede728 | 255 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 256 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 257 | PARAMS(_fields)) |
265822ae | 258 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 259 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 260 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
261 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
262 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 263 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 264 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 265 | compat_syscall_exit_##_name) |
141ddf28 MD |
266 | /* Enumerations only defined at inital inclusion (not here). */ |
267 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
268 | #define TRACE_SYSTEM compat_syscall_exit_integers |
269 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 270 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 271 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 272 | #undef TRACE_SYSTEM |
5b7ac358 MD |
273 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
274 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 275 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 276 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 277 | #undef TRACE_SYSTEM |
141ddf28 | 278 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
279 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
280 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
281 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
282 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 283 | #undef TP_PROBE_CB |
3bc29f0a MD |
284 | #undef _TRACE_SYSCALLS_INTEGERS_H |
285 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 286 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 287 | |
fc4f7161 | 288 | #undef SC_EXIT |
259b6cb3 | 289 | |
2655f9ad | 290 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
291 | #undef LTTNG_PACKAGE_BUILD |
292 | #undef CREATE_TRACE_POINTS | |
293 | ||
a93244f8 | 294 | struct trace_syscall_entry { |
2d6d88c6 | 295 | void *event_func; |
8a8ac9a8 | 296 | void *event_notifier_func; |
a93244f8 MD |
297 | const struct lttng_event_desc *desc; |
298 | const struct lttng_event_field *fields; | |
299 | unsigned int nrargs; | |
300 | }; | |
301 | ||
302 | #define CREATE_SYSCALL_TABLE | |
303 | ||
fc4f7161 MD |
304 | #define SC_ENTER |
305 | ||
306 | #undef sc_exit | |
307 | #define sc_exit(...) | |
308 | ||
259b6cb3 | 309 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 310 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 311 | [ _nr ] = { \ |
2d6d88c6 | 312 | .event_func = __event_probe__syscall_entry_##_template, \ |
8a8ac9a8 | 313 | .event_notifier_func = __event_notifier_probe__syscall_entry_##_template, \ |
259b6cb3 | 314 | .nrargs = (_nrargs), \ |
d4291869 MD |
315 | .fields = __event_fields___syscall_entry_##_template, \ |
316 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
317 | }, |
318 | ||
2d6d88c6 | 319 | /* Event syscall enter tracing table */ |
49c50022 | 320 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
321 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
322 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
323 | }; |
324 | ||
a93244f8 MD |
325 | #undef TRACE_SYSCALL_TABLE |
326 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
327 | [ _nr ] = { \ | |
2d6d88c6 | 328 | .event_func = __event_probe__compat_syscall_entry_##_template, \ |
8a8ac9a8 | 329 | .event_notifier_func = __event_notifier_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 330 | .nrargs = (_nrargs), \ |
d4291869 MD |
331 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
332 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
333 | }, |
334 | ||
2d6d88c6 | 335 | /* Event compat syscall enter table */ |
a93244f8 | 336 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
337 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
338 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 339 | }; |
259b6cb3 | 340 | |
fc4f7161 MD |
341 | #undef SC_ENTER |
342 | ||
343 | #define SC_EXIT | |
344 | ||
345 | #undef sc_exit | |
346 | #define sc_exit(...) __VA_ARGS__ | |
347 | ||
5b7ac358 MD |
348 | #undef TRACE_SYSCALL_TABLE |
349 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
350 | [ _nr ] = { \ | |
2d6d88c6 | 351 | .event_func = __event_probe__syscall_exit_##_template, \ |
8a8ac9a8 | 352 | .event_notifier_func = __event_notifier_probe__syscall_exit_##_template, \ |
5b7ac358 MD |
353 | .nrargs = (_nrargs), \ |
354 | .fields = __event_fields___syscall_exit_##_template, \ | |
355 | .desc = &__event_desc___syscall_exit_##_name, \ | |
356 | }, | |
357 | ||
2d6d88c6 | 358 | /* Event syscall exit table */ |
5b7ac358 | 359 | static const struct trace_syscall_entry sc_exit_table[] = { |
241ae9a8 MD |
360 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
361 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
362 | }; |
363 | ||
364 | #undef TRACE_SYSCALL_TABLE | |
365 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
366 | [ _nr ] = { \ | |
2d6d88c6 | 367 | .event_func = __event_probe__compat_syscall_exit_##_template, \ |
8a8ac9a8 | 368 | .event_notifier_func = __event_notifier_probe__compat_syscall_exit_##_template, \ |
5b7ac358 MD |
369 | .nrargs = (_nrargs), \ |
370 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
371 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
372 | }, | |
373 | ||
2d6d88c6 | 374 | /* Event compat syscall exit table */ |
5b7ac358 | 375 | const struct trace_syscall_entry compat_sc_exit_table[] = { |
241ae9a8 MD |
376 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
377 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
378 | }; |
379 | ||
fc4f7161 MD |
380 | #undef SC_EXIT |
381 | ||
a93244f8 | 382 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 383 | |
80f87dd2 | 384 | struct lttng_syscall_filter { |
badfe9f5 MD |
385 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
386 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
387 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
388 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
389 | }; |
390 | ||
2d6d88c6 | 391 | static void syscall_entry_event_unknown(struct lttng_event *event, |
8a8ac9a8 | 392 | struct pt_regs *regs, long id) |
f405cfce | 393 | { |
1b7b9c65 | 394 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 395 | |
1b7b9c65 | 396 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 397 | if (unlikely(in_compat_syscall())) |
d4291869 | 398 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 399 | else |
d4291869 | 400 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
401 | } |
402 | ||
8a8ac9a8 FD |
403 | static void syscall_entry_event_notifier_unknown( |
404 | struct hlist_head *unknown_dispatch_list_head, | |
405 | struct pt_regs *regs, long id) | |
406 | { | |
407 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
408 | struct lttng_event_notifier *notifier; | |
409 | ||
410 | lttng_syscall_get_arguments(current, regs, args); | |
411 | lttng_hlist_for_each_entry_rcu(notifier, unknown_dispatch_list_head, u.syscall.node) { | |
412 | if (unlikely(in_compat_syscall())) | |
413 | __event_notifier_probe__compat_syscall_entry_unknown(notifier, id, args); | |
414 | else | |
415 | __event_notifier_probe__syscall_entry_unknown(notifier, id, args); | |
416 | } | |
417 | } | |
418 | ||
419 | static void syscall_exit_event_notifier_unknown( | |
420 | struct hlist_head *unknown_dispatch_list_head, | |
421 | struct pt_regs *regs, long id, long ret) | |
422 | { | |
423 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
424 | struct lttng_event_notifier *notifier; | |
425 | ||
426 | lttng_syscall_get_arguments(current, regs, args); | |
427 | lttng_hlist_for_each_entry_rcu(notifier, unknown_dispatch_list_head, u.syscall.node) { | |
428 | if (unlikely(in_compat_syscall())) | |
429 | __event_notifier_probe__compat_syscall_exit_unknown(notifier, id, ret, args); | |
430 | else | |
431 | __event_notifier_probe__syscall_exit_unknown(notifier, id, ret, args); | |
432 | } | |
433 | } | |
434 | ||
63aa9160 FD |
435 | static __always_inline |
436 | void syscall_entry_call_func(void *func, unsigned int nrargs, void *data, | |
437 | struct pt_regs *regs) | |
259b6cb3 | 438 | { |
63aa9160 | 439 | switch (nrargs) { |
259b6cb3 MD |
440 | case 0: |
441 | { | |
63aa9160 | 442 | void (*fptr)(void *__data) = func; |
259b6cb3 | 443 | |
63aa9160 | 444 | fptr(data); |
259b6cb3 MD |
445 | break; |
446 | } | |
447 | case 1: | |
448 | { | |
63aa9160 | 449 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 450 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 451 | |
1b7b9c65 | 452 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 453 | fptr(data, args[0]); |
259b6cb3 MD |
454 | break; |
455 | } | |
456 | case 2: | |
457 | { | |
458 | void (*fptr)(void *__data, | |
459 | unsigned long arg0, | |
63aa9160 | 460 | unsigned long arg1) = func; |
1b7b9c65 | 461 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 462 | |
1b7b9c65 | 463 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 464 | fptr(data, args[0], args[1]); |
259b6cb3 MD |
465 | break; |
466 | } | |
467 | case 3: | |
468 | { | |
469 | void (*fptr)(void *__data, | |
470 | unsigned long arg0, | |
471 | unsigned long arg1, | |
63aa9160 | 472 | unsigned long arg2) = func; |
1b7b9c65 | 473 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 474 | |
1b7b9c65 | 475 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 476 | fptr(data, args[0], args[1], args[2]); |
259b6cb3 MD |
477 | break; |
478 | } | |
479 | case 4: | |
480 | { | |
481 | void (*fptr)(void *__data, | |
482 | unsigned long arg0, | |
483 | unsigned long arg1, | |
484 | unsigned long arg2, | |
63aa9160 | 485 | unsigned long arg3) = func; |
1b7b9c65 | 486 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 487 | |
1b7b9c65 | 488 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 489 | fptr(data, args[0], args[1], args[2], args[3]); |
259b6cb3 MD |
490 | break; |
491 | } | |
492 | case 5: | |
493 | { | |
494 | void (*fptr)(void *__data, | |
495 | unsigned long arg0, | |
496 | unsigned long arg1, | |
497 | unsigned long arg2, | |
498 | unsigned long arg3, | |
63aa9160 | 499 | unsigned long arg4) = func; |
1b7b9c65 | 500 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 501 | |
1b7b9c65 | 502 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 503 | fptr(data, args[0], args[1], args[2], args[3], args[4]); |
259b6cb3 MD |
504 | break; |
505 | } | |
506 | case 6: | |
507 | { | |
508 | void (*fptr)(void *__data, | |
509 | unsigned long arg0, | |
510 | unsigned long arg1, | |
511 | unsigned long arg2, | |
512 | unsigned long arg3, | |
513 | unsigned long arg4, | |
63aa9160 | 514 | unsigned long arg5) = func; |
1b7b9c65 | 515 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 516 | |
1b7b9c65 | 517 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 518 | fptr(data, args[0], args[1], args[2], |
259b6cb3 MD |
519 | args[3], args[4], args[5]); |
520 | break; | |
521 | } | |
522 | default: | |
523 | break; | |
524 | } | |
525 | } | |
526 | ||
8a8ac9a8 FD |
527 | static __always_inline |
528 | void syscall_entry_event_notifier_call_func(struct hlist_head *dispatch_list, | |
529 | void *func, unsigned int nrargs, struct pt_regs *regs) | |
530 | { | |
531 | struct lttng_event_notifier *notifier; | |
532 | ||
533 | switch (nrargs) { | |
534 | case 0: | |
535 | { | |
536 | void (*fptr)(void *__data) = func; | |
537 | ||
538 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
539 | fptr(notifier); | |
540 | break; | |
541 | } | |
542 | case 1: | |
543 | { | |
544 | void (*fptr)(void *__data, unsigned long arg0) = func; | |
545 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
546 | ||
547 | lttng_syscall_get_arguments(current, regs, args); | |
548 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
549 | fptr(notifier, args[0]); | |
550 | break; | |
551 | } | |
552 | case 2: | |
553 | { | |
554 | void (*fptr)(void *__data, | |
555 | unsigned long arg0, | |
556 | unsigned long arg1) = func; | |
557 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
558 | ||
559 | lttng_syscall_get_arguments(current, regs, args); | |
560 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
561 | fptr(notifier, args[0], args[1]); | |
562 | break; | |
563 | } | |
564 | case 3: | |
565 | { | |
566 | void (*fptr)(void *__data, | |
567 | unsigned long arg0, | |
568 | unsigned long arg1, | |
569 | unsigned long arg2) = func; | |
570 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
571 | ||
572 | lttng_syscall_get_arguments(current, regs, args); | |
573 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
574 | fptr(notifier, args[0], args[1], args[2]); | |
575 | break; | |
576 | } | |
577 | case 4: | |
578 | { | |
579 | void (*fptr)(void *__data, | |
580 | unsigned long arg0, | |
581 | unsigned long arg1, | |
582 | unsigned long arg2, | |
583 | unsigned long arg3) = func; | |
584 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
585 | ||
586 | lttng_syscall_get_arguments(current, regs, args); | |
587 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
588 | fptr(notifier, args[0], args[1], args[2], args[3]); | |
589 | break; | |
590 | } | |
591 | case 5: | |
592 | { | |
593 | void (*fptr)(void *__data, | |
594 | unsigned long arg0, | |
595 | unsigned long arg1, | |
596 | unsigned long arg2, | |
597 | unsigned long arg3, | |
598 | unsigned long arg4) = func; | |
599 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
600 | ||
601 | lttng_syscall_get_arguments(current, regs, args); | |
602 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
603 | fptr(notifier, args[0], args[1], args[2], args[3], args[4]); | |
604 | break; | |
605 | } | |
606 | case 6: | |
607 | { | |
608 | void (*fptr)(void *__data, | |
609 | unsigned long arg0, | |
610 | unsigned long arg1, | |
611 | unsigned long arg2, | |
612 | unsigned long arg3, | |
613 | unsigned long arg4, | |
614 | unsigned long arg5) = func; | |
615 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
616 | ||
617 | lttng_syscall_get_arguments(current, regs, args); | |
618 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
619 | fptr(notifier, args[0], args[1], args[2], args[3], args[4], args[5]); | |
620 | break; | |
621 | } | |
622 | default: | |
623 | break; | |
624 | } | |
625 | } | |
626 | ||
63aa9160 FD |
627 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
628 | { | |
629 | struct lttng_channel *chan = __data; | |
630 | struct lttng_event *event, *unknown_event; | |
631 | const struct trace_syscall_entry *table, *entry; | |
632 | size_t table_len; | |
633 | ||
634 | if (unlikely(in_compat_syscall())) { | |
635 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
636 | ||
637 | if (id < 0 || id >= NR_compat_syscalls | |
638 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_entry))) { | |
639 | /* System call filtered out. */ | |
640 | return; | |
641 | } | |
642 | table = compat_sc_table; | |
643 | table_len = ARRAY_SIZE(compat_sc_table); | |
644 | unknown_event = chan->sc_compat_unknown; | |
645 | } else { | |
646 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
647 | ||
648 | if (id < 0 || id >= NR_syscalls | |
649 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_entry))) { | |
650 | /* System call filtered out. */ | |
651 | return; | |
652 | } | |
653 | table = sc_table; | |
654 | table_len = ARRAY_SIZE(sc_table); | |
655 | unknown_event = chan->sc_unknown; | |
656 | } | |
657 | if (unlikely(id < 0 || id >= table_len)) { | |
658 | syscall_entry_event_unknown(unknown_event, regs, id); | |
659 | return; | |
660 | } | |
661 | if (unlikely(in_compat_syscall())) | |
662 | event = chan->compat_sc_table[id]; | |
663 | else | |
664 | event = chan->sc_table[id]; | |
665 | if (unlikely(!event)) { | |
666 | syscall_entry_event_unknown(unknown_event, regs, id); | |
667 | return; | |
668 | } | |
669 | entry = &table[id]; | |
d053f3ee | 670 | WARN_ON_ONCE(!entry->event_func); |
63aa9160 FD |
671 | syscall_entry_call_func(entry->event_func, entry->nrargs, event, regs); |
672 | } | |
673 | ||
8a8ac9a8 FD |
674 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
675 | long id) | |
676 | { | |
677 | struct lttng_event_notifier_group *group = __data; | |
678 | const struct trace_syscall_entry *table, *entry; | |
679 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
680 | size_t table_len; | |
681 | ||
682 | if (unlikely(in_compat_syscall())) { | |
683 | struct lttng_syscall_filter *filter = group->sc_filter; | |
684 | ||
685 | if (id < 0 || id >= NR_compat_syscalls | |
686 | || (!READ_ONCE(group->syscall_all_entry) && | |
687 | !test_bit(id, filter->sc_compat_entry))) { | |
688 | /* System call filtered out. */ | |
689 | return; | |
690 | } | |
691 | table = compat_sc_table; | |
692 | table_len = ARRAY_SIZE(compat_sc_table); | |
693 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
694 | } else { | |
695 | struct lttng_syscall_filter *filter = group->sc_filter; | |
696 | ||
697 | if (id < 0 || id >= NR_syscalls | |
698 | || (!READ_ONCE(group->syscall_all_entry) && | |
699 | !test_bit(id, filter->sc_entry))) { | |
700 | /* System call filtered out. */ | |
701 | return; | |
702 | } | |
703 | table = sc_table; | |
704 | table_len = ARRAY_SIZE(sc_table); | |
705 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
706 | } | |
707 | /* Check if the syscall id is out of bound. */ | |
708 | if (unlikely(id < 0 || id >= table_len)) { | |
709 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
710 | regs, id); | |
711 | return; | |
712 | } | |
713 | ||
714 | entry = &table[id]; | |
715 | if (!entry->event_notifier_func) { | |
716 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
717 | regs, id); | |
718 | return; | |
719 | } | |
720 | ||
721 | if (unlikely(in_compat_syscall())) { | |
722 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
723 | } else { | |
724 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
725 | } | |
726 | if (unlikely(hlist_empty(dispatch_list))) | |
727 | return; | |
728 | ||
729 | syscall_entry_event_notifier_call_func(dispatch_list, | |
730 | entry->event_notifier_func, entry->nrargs, regs); | |
731 | } | |
732 | ||
2d6d88c6 | 733 | static void syscall_exit_event_unknown(struct lttng_event *event, |
8a8ac9a8 | 734 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 735 | { |
1b7b9c65 | 736 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 737 | |
1b7b9c65 | 738 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 739 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
740 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
741 | args); | |
742 | else | |
743 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
744 | } | |
745 | ||
2d6d88c6 | 746 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
5b7ac358 MD |
747 | { |
748 | struct lttng_channel *chan = __data; | |
749 | struct lttng_event *event, *unknown_event; | |
750 | const struct trace_syscall_entry *table, *entry; | |
751 | size_t table_len; | |
752 | long id; | |
753 | ||
754 | id = syscall_get_nr(current, regs); | |
1aa3298b | 755 | if (unlikely(in_compat_syscall())) { |
badfe9f5 MD |
756 | struct lttng_syscall_filter *filter = chan->sc_filter; |
757 | ||
758 | if (id < 0 || id >= NR_compat_syscalls | |
759 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_exit))) { | |
760 | /* System call filtered out. */ | |
761 | return; | |
5b7ac358 MD |
762 | } |
763 | table = compat_sc_exit_table; | |
764 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
765 | unknown_event = chan->compat_sc_exit_unknown; | |
766 | } else { | |
badfe9f5 MD |
767 | struct lttng_syscall_filter *filter = chan->sc_filter; |
768 | ||
769 | if (id < 0 || id >= NR_syscalls | |
770 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_exit))) { | |
771 | /* System call filtered out. */ | |
772 | return; | |
5b7ac358 MD |
773 | } |
774 | table = sc_exit_table; | |
775 | table_len = ARRAY_SIZE(sc_exit_table); | |
776 | unknown_event = chan->sc_exit_unknown; | |
777 | } | |
74f7b56a | 778 | if (unlikely(id < 0 || id >= table_len)) { |
2d6d88c6 | 779 | syscall_exit_event_unknown(unknown_event, regs, id, ret); |
5b7ac358 MD |
780 | return; |
781 | } | |
1aa3298b | 782 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
783 | event = chan->compat_sc_exit_table[id]; |
784 | else | |
785 | event = chan->sc_exit_table[id]; | |
786 | if (unlikely(!event)) { | |
2d6d88c6 | 787 | syscall_exit_event_unknown(unknown_event, regs, id, ret); |
5b7ac358 MD |
788 | return; |
789 | } | |
790 | entry = &table[id]; | |
d053f3ee | 791 | WARN_ON_ONCE(!entry->event_func); |
5b7ac358 MD |
792 | |
793 | switch (entry->nrargs) { | |
794 | case 0: | |
795 | { | |
2d6d88c6 | 796 | void (*fptr)(void *__data, long ret) = entry->event_func; |
5b7ac358 | 797 | |
fc4f7161 | 798 | fptr(event, ret); |
5b7ac358 MD |
799 | break; |
800 | } | |
801 | case 1: | |
802 | { | |
803 | void (*fptr)(void *__data, | |
fc4f7161 | 804 | long ret, |
2d6d88c6 | 805 | unsigned long arg0) = entry->event_func; |
1b7b9c65 | 806 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 807 | |
1b7b9c65 | 808 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 809 | fptr(event, ret, args[0]); |
5b7ac358 MD |
810 | break; |
811 | } | |
812 | case 2: | |
813 | { | |
814 | void (*fptr)(void *__data, | |
fc4f7161 | 815 | long ret, |
5b7ac358 | 816 | unsigned long arg0, |
2d6d88c6 | 817 | unsigned long arg1) = entry->event_func; |
1b7b9c65 | 818 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 819 | |
1b7b9c65 | 820 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 821 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
822 | break; |
823 | } | |
824 | case 3: | |
825 | { | |
826 | void (*fptr)(void *__data, | |
fc4f7161 | 827 | long ret, |
5b7ac358 MD |
828 | unsigned long arg0, |
829 | unsigned long arg1, | |
2d6d88c6 | 830 | unsigned long arg2) = entry->event_func; |
1b7b9c65 | 831 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 832 | |
1b7b9c65 | 833 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 834 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
835 | break; |
836 | } | |
837 | case 4: | |
838 | { | |
839 | void (*fptr)(void *__data, | |
fc4f7161 | 840 | long ret, |
5b7ac358 MD |
841 | unsigned long arg0, |
842 | unsigned long arg1, | |
843 | unsigned long arg2, | |
2d6d88c6 | 844 | unsigned long arg3) = entry->event_func; |
1b7b9c65 | 845 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 846 | |
1b7b9c65 | 847 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 848 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
849 | break; |
850 | } | |
851 | case 5: | |
852 | { | |
853 | void (*fptr)(void *__data, | |
fc4f7161 | 854 | long ret, |
5b7ac358 MD |
855 | unsigned long arg0, |
856 | unsigned long arg1, | |
857 | unsigned long arg2, | |
858 | unsigned long arg3, | |
2d6d88c6 | 859 | unsigned long arg4) = entry->event_func; |
1b7b9c65 | 860 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 861 | |
1b7b9c65 | 862 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 863 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
864 | break; |
865 | } | |
866 | case 6: | |
867 | { | |
868 | void (*fptr)(void *__data, | |
fc4f7161 | 869 | long ret, |
5b7ac358 MD |
870 | unsigned long arg0, |
871 | unsigned long arg1, | |
872 | unsigned long arg2, | |
873 | unsigned long arg3, | |
874 | unsigned long arg4, | |
2d6d88c6 | 875 | unsigned long arg5) = entry->event_func; |
1b7b9c65 | 876 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 877 | |
1b7b9c65 | 878 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 879 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
880 | args[3], args[4], args[5]); |
881 | break; | |
882 | } | |
883 | default: | |
884 | break; | |
885 | } | |
886 | } | |
887 | ||
8a8ac9a8 FD |
888 | static __always_inline |
889 | void syscall_exit_event_notifier_call_func(struct hlist_head *dispatch_list, | |
890 | void *func, unsigned int nrargs, struct pt_regs *regs, long ret) | |
891 | { | |
892 | struct lttng_event_notifier *notifier; | |
893 | ||
894 | switch (nrargs) { | |
895 | case 0: | |
896 | { | |
897 | void (*fptr)(void *__data, long ret) = func; | |
898 | ||
899 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
900 | fptr(notifier, ret); | |
901 | break; | |
902 | } | |
903 | case 1: | |
904 | { | |
905 | void (*fptr)(void *__data, long ret, unsigned long arg0) = func; | |
906 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
907 | ||
908 | lttng_syscall_get_arguments(current, regs, args); | |
909 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
910 | fptr(notifier, ret, args[0]); | |
911 | break; | |
912 | } | |
913 | case 2: | |
914 | { | |
915 | void (*fptr)(void *__data, | |
916 | long ret, | |
917 | unsigned long arg0, | |
918 | unsigned long arg1) = func; | |
919 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
920 | ||
921 | lttng_syscall_get_arguments(current, regs, args); | |
922 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
923 | fptr(notifier, ret, args[0], args[1]); | |
924 | break; | |
925 | } | |
926 | case 3: | |
927 | { | |
928 | void (*fptr)(void *__data, | |
929 | long ret, | |
930 | unsigned long arg0, | |
931 | unsigned long arg1, | |
932 | unsigned long arg2) = func; | |
933 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
934 | ||
935 | lttng_syscall_get_arguments(current, regs, args); | |
936 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
937 | fptr(notifier, ret, args[0], args[1], args[2]); | |
938 | break; | |
939 | } | |
940 | case 4: | |
941 | { | |
942 | void (*fptr)(void *__data, | |
943 | long ret, | |
944 | unsigned long arg0, | |
945 | unsigned long arg1, | |
946 | unsigned long arg2, | |
947 | unsigned long arg3) = func; | |
948 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
949 | ||
950 | lttng_syscall_get_arguments(current, regs, args); | |
951 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
952 | fptr(notifier, ret, args[0], args[1], args[2], args[3]); | |
953 | break; | |
954 | } | |
955 | case 5: | |
956 | { | |
957 | void (*fptr)(void *__data, | |
958 | long ret, | |
959 | unsigned long arg0, | |
960 | unsigned long arg1, | |
961 | unsigned long arg2, | |
962 | unsigned long arg3, | |
963 | unsigned long arg4) = func; | |
964 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
965 | ||
966 | lttng_syscall_get_arguments(current, regs, args); | |
967 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
968 | fptr(notifier, ret, args[0], args[1], args[2], args[3], args[4]); | |
969 | break; | |
970 | } | |
971 | case 6: | |
972 | { | |
973 | void (*fptr)(void *__data, | |
974 | long ret, | |
975 | unsigned long arg0, | |
976 | unsigned long arg1, | |
977 | unsigned long arg2, | |
978 | unsigned long arg3, | |
979 | unsigned long arg4, | |
980 | unsigned long arg5) = func; | |
981 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; | |
982 | ||
983 | lttng_syscall_get_arguments(current, regs, args); | |
984 | lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node) | |
985 | fptr(notifier, ret, args[0], args[1], args[2], args[3], args[4], args[5]); | |
986 | break; | |
987 | } | |
988 | default: | |
989 | break; | |
990 | } | |
991 | } | |
992 | ||
993 | static | |
994 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
995 | long ret) | |
996 | { | |
997 | struct lttng_event_notifier_group *group = __data; | |
998 | const struct trace_syscall_entry *table, *entry; | |
999 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
1000 | size_t table_len; | |
1001 | long id; | |
1002 | ||
1003 | id = syscall_get_nr(current, regs); | |
1004 | ||
1005 | if (unlikely(in_compat_syscall())) { | |
1006 | struct lttng_syscall_filter *filter = group->sc_filter; | |
1007 | ||
1008 | if (id < 0 || id >= NR_compat_syscalls | |
1009 | || (!READ_ONCE(group->syscall_all_exit) && | |
1010 | !test_bit(id, filter->sc_compat_exit))) { | |
1011 | /* System call filtered out. */ | |
1012 | return; | |
1013 | } | |
1014 | table = compat_sc_exit_table; | |
1015 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
1016 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
1017 | } else { | |
1018 | struct lttng_syscall_filter *filter = group->sc_filter; | |
1019 | ||
1020 | if (id < 0 || id >= NR_syscalls | |
1021 | || (!READ_ONCE(group->syscall_all_exit) && | |
1022 | !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_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
1029 | } | |
1030 | /* Check if the syscall id is out of bound. */ | |
1031 | if (unlikely(id < 0 || id >= table_len)) { | |
1032 | syscall_exit_event_notifier_unknown(unknown_dispatch_list, | |
1033 | regs, id, ret); | |
1034 | return; | |
1035 | } | |
1036 | ||
1037 | entry = &table[id]; | |
1038 | if (!entry->event_notifier_func) { | |
1039 | syscall_entry_event_notifier_unknown(unknown_dispatch_list, | |
1040 | regs, id); | |
1041 | return; | |
1042 | } | |
1043 | ||
1044 | if (unlikely(in_compat_syscall())) { | |
1045 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
1046 | } else { | |
1047 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
1048 | } | |
1049 | if (unlikely(hlist_empty(dispatch_list))) | |
1050 | return; | |
1051 | ||
1052 | syscall_exit_event_notifier_call_func(dispatch_list, | |
1053 | entry->event_notifier_func, entry->nrargs, regs, ret); | |
1054 | } | |
33a39a3c MD |
1055 | /* |
1056 | * noinline to diminish caller stack size. | |
1057 | * Should be called with sessions lock held. | |
1058 | */ | |
49c50022 | 1059 | static |
2d6d88c6 | 1060 | int fill_event_table(const struct trace_syscall_entry *table, size_t table_len, |
5b7ac358 MD |
1061 | struct lttng_event **chan_table, struct lttng_channel *chan, |
1062 | void *filter, enum sc_type type) | |
259b6cb3 | 1063 | { |
2a0c4816 | 1064 | const struct lttng_event_desc *desc; |
259b6cb3 | 1065 | unsigned int i; |
49c50022 MD |
1066 | |
1067 | /* Allocate events for each syscall, insert into table */ | |
1068 | for (i = 0; i < table_len; i++) { | |
1069 | struct lttng_kernel_event ev; | |
2a0c4816 | 1070 | desc = table[i].desc; |
49c50022 MD |
1071 | |
1072 | if (!desc) { | |
1073 | /* Unknown syscall */ | |
1074 | continue; | |
1075 | } | |
1076 | /* | |
1077 | * Skip those already populated by previous failed | |
1078 | * register for this channel. | |
1079 | */ | |
1080 | if (chan_table[i]) | |
1081 | continue; | |
1082 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
1083 | switch (type) { |
1084 | case SC_TYPE_ENTRY: | |
badfe9f5 MD |
1085 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
1086 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
1087 | break; |
1088 | case SC_TYPE_EXIT: | |
badfe9f5 MD |
1089 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
1090 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
1091 | break; |
1092 | case SC_TYPE_COMPAT_ENTRY: | |
badfe9f5 MD |
1093 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
1094 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
1095 | break; |
1096 | case SC_TYPE_COMPAT_EXIT: | |
badfe9f5 MD |
1097 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
1098 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
1099 | break; |
1100 | } | |
092ffe97 | 1101 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN - 1); |
f8695253 | 1102 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
1103 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
1104 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 1105 | desc, ev.instrumentation); |
abc0446a MD |
1106 | WARN_ON_ONCE(!chan_table[i]); |
1107 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
1108 | /* |
1109 | * If something goes wrong in event registration | |
1110 | * after the first one, we have no choice but to | |
1111 | * leave the previous events in there, until | |
1112 | * deleted by session teardown. | |
1113 | */ | |
abc0446a | 1114 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
1115 | } |
1116 | } | |
1117 | return 0; | |
1118 | } | |
1119 | ||
33a39a3c MD |
1120 | /* |
1121 | * Should be called with sessions lock held. | |
1122 | */ | |
2d6d88c6 | 1123 | int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter) |
49c50022 | 1124 | { |
2a0c4816 | 1125 | struct lttng_kernel_event ev; |
259b6cb3 MD |
1126 | int ret; |
1127 | ||
263b6c88 | 1128 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
1129 | |
1130 | if (!chan->sc_table) { | |
1131 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 1132 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
1133 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
1134 | if (!chan->sc_table) | |
1135 | return -ENOMEM; | |
1136 | } | |
5b7ac358 MD |
1137 | if (!chan->sc_exit_table) { |
1138 | /* create syscall table mapping syscall to events */ | |
1139 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
1140 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
1141 | if (!chan->sc_exit_table) | |
1142 | return -ENOMEM; | |
1143 | } | |
1144 | ||
259b6cb3 | 1145 | |
49c50022 MD |
1146 | #ifdef CONFIG_COMPAT |
1147 | if (!chan->compat_sc_table) { | |
1148 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 1149 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 1150 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
1151 | if (!chan->compat_sc_table) |
1152 | return -ENOMEM; | |
1153 | } | |
5b7ac358 MD |
1154 | |
1155 | if (!chan->compat_sc_exit_table) { | |
1156 | /* create syscall table mapping compat syscall to events */ | |
1157 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
1158 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
1159 | if (!chan->compat_sc_exit_table) | |
1160 | return -ENOMEM; | |
1161 | } | |
49c50022 | 1162 | #endif |
f405cfce | 1163 | if (!chan->sc_unknown) { |
f405cfce | 1164 | const struct lttng_event_desc *desc = |
d4291869 | 1165 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 1166 | |
f405cfce | 1167 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
1168 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
1169 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 1170 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
1171 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
1172 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 1173 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
1174 | desc, |
1175 | ev.instrumentation); | |
abc0446a MD |
1176 | WARN_ON_ONCE(!chan->sc_unknown); |
1177 | if (IS_ERR(chan->sc_unknown)) { | |
1178 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
1179 | } |
1180 | } | |
1181 | ||
b76dc1a0 | 1182 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 1183 | const struct lttng_event_desc *desc = |
d4291869 | 1184 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
1185 | |
1186 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
1187 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
1188 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 1189 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
1190 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
1191 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 1192 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
1193 | desc, |
1194 | ev.instrumentation); | |
abc0446a MD |
1195 | WARN_ON_ONCE(!chan->sc_unknown); |
1196 | if (IS_ERR(chan->sc_compat_unknown)) { | |
1197 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
1198 | } |
1199 | } | |
1200 | ||
5b7ac358 | 1201 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 1202 | const struct lttng_event_desc *desc = |
5b7ac358 | 1203 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
1204 | |
1205 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
1206 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
1207 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 1208 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
1209 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
1210 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 1211 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, |
3c997079 MD |
1212 | filter, desc, |
1213 | ev.instrumentation); | |
5b7ac358 MD |
1214 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
1215 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
1216 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
1217 | } | |
1218 | } | |
1219 | ||
1220 | if (!chan->sc_exit_unknown) { | |
1221 | const struct lttng_event_desc *desc = | |
1222 | &__event_desc___syscall_exit_unknown; | |
1223 | ||
1224 | memset(&ev, 0, sizeof(ev)); | |
1225 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
1226 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 1227 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
1228 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
1229 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 1230 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 | 1231 | desc, ev.instrumentation); |
5b7ac358 MD |
1232 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
1233 | if (IS_ERR(chan->sc_exit_unknown)) { | |
1234 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
1235 | } |
1236 | } | |
1237 | ||
2d6d88c6 | 1238 | ret = fill_event_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
1239 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
1240 | if (ret) | |
1241 | return ret; | |
2d6d88c6 | 1242 | ret = fill_event_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), |
5b7ac358 | 1243 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); |
49c50022 MD |
1244 | if (ret) |
1245 | return ret; | |
5b7ac358 | 1246 | |
49c50022 | 1247 | #ifdef CONFIG_COMPAT |
2d6d88c6 | 1248 | ret = fill_event_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
1249 | chan->compat_sc_table, chan, filter, |
1250 | SC_TYPE_COMPAT_ENTRY); | |
1251 | if (ret) | |
1252 | return ret; | |
2d6d88c6 | 1253 | ret = fill_event_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
5b7ac358 MD |
1254 | chan->compat_sc_exit_table, chan, filter, |
1255 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
1256 | if (ret) |
1257 | return ret; | |
1258 | #endif | |
badfe9f5 MD |
1259 | |
1260 | if (!chan->sc_filter) { | |
1261 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1262 | GFP_KERNEL); | |
1263 | if (!chan->sc_filter) | |
1264 | return -ENOMEM; | |
1265 | } | |
1266 | ||
80f87dd2 MD |
1267 | if (!chan->sys_enter_registered) { |
1268 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 1269 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1270 | if (ret) |
1271 | return ret; | |
1272 | chan->sys_enter_registered = 1; | |
1273 | } | |
63728b02 MD |
1274 | /* |
1275 | * We change the name of sys_exit tracepoint due to namespace | |
1276 | * conflict with sys_exit syscall entry. | |
1277 | */ | |
80f87dd2 MD |
1278 | if (!chan->sys_exit_registered) { |
1279 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 1280 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1281 | if (ret) { |
1282 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 1283 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
1284 | return ret; |
1285 | } | |
1286 | chan->sys_exit_registered = 1; | |
63728b02 | 1287 | } |
259b6cb3 MD |
1288 | return ret; |
1289 | } | |
1290 | ||
1291 | /* | |
8a8ac9a8 FD |
1292 | * Should be called with sessions lock held. |
1293 | */ | |
1294 | int lttng_syscalls_register_event_notifier( | |
1295 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1296 | void *filter) | |
1297 | { | |
1298 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1299 | unsigned int i; | |
1300 | int ret = 0; | |
1301 | ||
1302 | wrapper_vmalloc_sync_mappings(); | |
1303 | ||
1304 | if (!group->event_notifier_syscall_dispatch) { | |
1305 | group->event_notifier_syscall_dispatch = | |
1306 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1307 | GFP_KERNEL); | |
1308 | if (!group->event_notifier_syscall_dispatch) | |
1309 | return -ENOMEM; | |
1310 | ||
1311 | /* Initialize all list_head */ | |
1312 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1313 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); | |
1314 | ||
1315 | /* Init the unknown syscall notifier list. */ | |
1316 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
1317 | } | |
1318 | ||
1319 | if (!group->event_notifier_exit_syscall_dispatch) { | |
1320 | group->event_notifier_exit_syscall_dispatch = | |
1321 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1322 | GFP_KERNEL); | |
1323 | if (!group->event_notifier_exit_syscall_dispatch) | |
1324 | return -ENOMEM; | |
1325 | ||
1326 | /* Initialize all list_head */ | |
1327 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1328 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); | |
1329 | ||
1330 | /* Init the unknown exit syscall notifier list. */ | |
1331 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
1332 | } | |
1333 | ||
1334 | #ifdef CONFIG_COMPAT | |
1335 | if (!group->event_notifier_compat_syscall_dispatch) { | |
1336 | group->event_notifier_compat_syscall_dispatch = | |
1337 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_table), | |
1338 | GFP_KERNEL); | |
1339 | if (!group->event_notifier_syscall_dispatch) | |
1340 | return -ENOMEM; | |
1341 | ||
1342 | /* Initialize all list_head */ | |
1343 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) | |
1344 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); | |
1345 | ||
1346 | /* Init the unknown syscall notifier list. */ | |
1347 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
1348 | } | |
1349 | ||
1350 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
1351 | group->event_notifier_exit_compat_syscall_dispatch = | |
1352 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_exit_table), | |
1353 | GFP_KERNEL); | |
1354 | if (!group->event_notifier_exit_syscall_dispatch) | |
1355 | return -ENOMEM; | |
1356 | ||
1357 | /* Initialize all list_head */ | |
1358 | for (i = 0; i < ARRAY_SIZE(compat_sc_exit_table); i++) | |
1359 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); | |
1360 | ||
1361 | /* Init the unknown exit syscall notifier list. */ | |
1362 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
1363 | } | |
1364 | #endif | |
1365 | ||
1366 | if (!group->sc_filter) { | |
1367 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1368 | GFP_KERNEL); | |
1369 | if (!group->sc_filter) | |
1370 | return -ENOMEM; | |
1371 | } | |
1372 | ||
1373 | if (!group->sys_enter_registered) { | |
1374 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
1375 | (void *) syscall_entry_event_notifier_probe, group); | |
1376 | if (ret) | |
1377 | return ret; | |
1378 | group->sys_enter_registered = 1; | |
1379 | } | |
1380 | ||
1381 | if (!group->sys_exit_registered) { | |
1382 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
1383 | (void *) syscall_exit_event_notifier_probe, group); | |
1384 | if (ret) { | |
1385 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1386 | (void *) syscall_entry_event_notifier_probe, group)); | |
1387 | return ret; | |
1388 | } | |
1389 | group->sys_exit_registered = 1; | |
1390 | } | |
1391 | ||
1392 | return ret; | |
1393 | } | |
1394 | ||
1395 | static | |
1396 | int create_unknown_event_notifier( | |
1397 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1398 | enum sc_type type) | |
1399 | { | |
1400 | struct lttng_event_notifier *notifier; | |
1401 | const struct lttng_event_desc *desc; | |
1402 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1403 | struct lttng_kernel_event_notifier event_notifier_param; | |
1404 | uint64_t user_token = event_notifier_enabler->base.user_token; | |
1405 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( | |
1406 | event_notifier_enabler); | |
1407 | struct hlist_head *unknown_dispatch_list; | |
1408 | int ret = 0; | |
1409 | bool found = false; | |
1410 | enum lttng_kernel_syscall_abi abi; | |
1411 | enum lttng_kernel_syscall_entryexit entryexit; | |
1412 | struct hlist_head *head; | |
1413 | ||
1414 | switch (type) { | |
1415 | case SC_TYPE_ENTRY: | |
1416 | desc = &__event_desc___syscall_entry_unknown; | |
1417 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
1418 | entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; | |
1419 | abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
1420 | break; | |
1421 | case SC_TYPE_EXIT: | |
1422 | desc = &__event_desc___syscall_exit_unknown; | |
1423 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
1424 | entryexit = LTTNG_KERNEL_SYSCALL_EXIT; | |
1425 | abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
1426 | break; | |
1427 | case SC_TYPE_COMPAT_ENTRY: | |
1428 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1429 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
1430 | entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; | |
1431 | abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
1432 | break; | |
1433 | case SC_TYPE_COMPAT_EXIT: | |
1434 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1435 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
1436 | entryexit = LTTNG_KERNEL_SYSCALL_EXIT; | |
1437 | abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
1438 | break; | |
1439 | default: | |
1440 | BUG_ON(1); | |
1441 | } | |
1442 | ||
1443 | /* | |
1444 | * Check if already created. | |
1445 | */ | |
1446 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
1447 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1448 | lttng_hlist_for_each_entry(notifier, head, hlist) { | |
1449 | if (notifier->desc == desc && | |
1450 | notifier->user_token == base_enabler->user_token) | |
1451 | found = true; | |
1452 | } | |
1453 | if (found) | |
1454 | goto end; | |
1455 | ||
1456 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1457 | strncat(event_notifier_param.event.name, desc->name, | |
1458 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
1459 | ||
1460 | event_notifier_param.event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1461 | ||
1462 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
1463 | event_notifier_param.event.u.syscall.abi = abi; | |
1464 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1465 | ||
1466 | notifier = _lttng_event_notifier_create(desc, user_token, | |
1467 | group, &event_notifier_param, NULL, | |
1468 | event_notifier_param.event.instrumentation); | |
1469 | if (IS_ERR(notifier)) { | |
1470 | printk(KERN_INFO "Unable to create unknown notifier %s\n", | |
1471 | desc->name); | |
1472 | ret = -ENOMEM; | |
1473 | goto end; | |
1474 | } | |
1475 | ||
1476 | hlist_add_head_rcu(¬ifier->u.syscall.node, unknown_dispatch_list); | |
1477 | ||
1478 | end: | |
1479 | return ret; | |
1480 | } | |
1481 | ||
1482 | static int create_matching_event_notifiers( | |
1483 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1484 | void *filter, const struct trace_syscall_entry *table, | |
1485 | size_t table_len, enum sc_type type) | |
1486 | { | |
1487 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1488 | const struct lttng_event_desc *desc; | |
1489 | uint64_t user_token = event_notifier_enabler->base.user_token; | |
1490 | unsigned int i; | |
1491 | int ret = 0; | |
1492 | ||
1493 | /* iterate over all syscall and create event_notifier that match */ | |
1494 | for (i = 0; i < table_len; i++) { | |
1495 | struct lttng_event_notifier *event_notifier; | |
1496 | struct lttng_kernel_event_notifier event_notifier_param; | |
1497 | struct hlist_head *head; | |
1498 | int found = 0; | |
1499 | ||
1500 | desc = table[i].desc; | |
1501 | if (!desc) { | |
1502 | /* Unknown syscall */ | |
1503 | continue; | |
1504 | } | |
1505 | ||
1506 | if (!lttng_desc_match_enabler(desc, | |
1507 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1508 | continue; | |
1509 | ||
1510 | /* | |
1511 | * Check if already created. | |
1512 | */ | |
1513 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
1514 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name); | |
1515 | lttng_hlist_for_each_entry(event_notifier, head, hlist) { | |
1516 | if (event_notifier->desc == desc | |
1517 | && event_notifier->user_token == event_notifier_enabler->base.user_token) | |
1518 | found = 1; | |
1519 | } | |
1520 | if (found) | |
1521 | continue; | |
1522 | ||
1523 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1524 | switch (type) { | |
1525 | case SC_TYPE_ENTRY: | |
1526 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; | |
1527 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
1528 | break; | |
1529 | case SC_TYPE_EXIT: | |
1530 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; | |
1531 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
1532 | break; | |
1533 | case SC_TYPE_COMPAT_ENTRY: | |
1534 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; | |
1535 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
1536 | break; | |
1537 | case SC_TYPE_COMPAT_EXIT: | |
1538 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; | |
1539 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
1540 | break; | |
1541 | } | |
1542 | strncat(event_notifier_param.event.name, desc->name, | |
1543 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
1544 | event_notifier_param.event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1545 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_SYSCALL; | |
1546 | ||
1547 | event_notifier = _lttng_event_notifier_create(desc, user_token, group, | |
1548 | &event_notifier_param, filter, | |
1549 | event_notifier_param.event.instrumentation); | |
1550 | if (IS_ERR(event_notifier)) { | |
1551 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
1552 | desc->name); | |
1553 | ret = -ENOMEM; | |
1554 | goto end; | |
1555 | } | |
1556 | ||
1557 | event_notifier->u.syscall.syscall_id = i; | |
1558 | } | |
1559 | ||
1560 | end: | |
1561 | return ret; | |
1562 | ||
1563 | } | |
1564 | ||
1565 | int lttng_syscals_create_matching_event_notifiers( | |
1566 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1567 | void *filter) | |
1568 | { | |
1569 | int ret; | |
1570 | struct lttng_enabler *base_enabler = | |
1571 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
1572 | enum lttng_kernel_syscall_entryexit entryexit = | |
1573 | base_enabler->event_param.u.syscall.entryexit; | |
1574 | ||
1575 | if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) { | |
1576 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
1577 | filter, sc_table, ARRAY_SIZE(sc_table), SC_TYPE_ENTRY); | |
1578 | if (ret) | |
1579 | goto end; | |
1580 | ||
1581 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
1582 | filter, compat_sc_table, ARRAY_SIZE(compat_sc_table), | |
1583 | SC_TYPE_COMPAT_ENTRY); | |
1584 | if (ret) | |
1585 | goto end; | |
1586 | ||
1587 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1588 | SC_TYPE_ENTRY); | |
1589 | if (ret) | |
1590 | goto end; | |
1591 | ||
1592 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1593 | SC_TYPE_COMPAT_ENTRY); | |
1594 | if (ret) | |
1595 | goto end; | |
1596 | } | |
1597 | ||
1598 | if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) { | |
1599 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
1600 | filter, sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
1601 | SC_TYPE_EXIT); | |
1602 | if (ret) | |
1603 | goto end; | |
1604 | ||
1605 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1606 | SC_TYPE_EXIT); | |
1607 | if (ret) | |
1608 | goto end; | |
1609 | ||
1610 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
1611 | filter, compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
1612 | SC_TYPE_COMPAT_EXIT); | |
1613 | if (ret) | |
1614 | goto end; | |
1615 | ||
1616 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1617 | SC_TYPE_COMPAT_EXIT); | |
1618 | if (ret) | |
1619 | goto end; | |
1620 | } | |
1621 | ||
1622 | end: | |
1623 | return ret; | |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1628 | */ |
8a8ac9a8 FD |
1629 | int lttng_syscalls_unregister_event_notifier( |
1630 | struct lttng_event_notifier_group *event_notifier_group) | |
1631 | { | |
1632 | int ret; | |
1633 | ||
1634 | /* | |
1635 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1636 | * At the moment, we don't think it's desirable to have one fired | |
1637 | * event_notifier for the entry and one for the exit of a syscall. | |
1638 | */ | |
1639 | if (event_notifier_group->sys_enter_registered) { | |
1640 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1641 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1642 | if (ret) | |
1643 | return ret; | |
1644 | event_notifier_group->sys_enter_registered = 0; | |
1645 | } | |
1646 | if (event_notifier_group->sys_exit_registered) { | |
1647 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1648 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1649 | if (ret) | |
1650 | return ret; | |
1651 | event_notifier_group->sys_enter_registered = 0; | |
1652 | } | |
1653 | ||
1654 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1655 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1656 | #ifdef CONFIG_COMPAT | |
1657 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1658 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1659 | #endif | |
1660 | return 0; | |
1661 | } | |
1662 | ||
2d6d88c6 | 1663 | int lttng_syscalls_unregister_event(struct lttng_channel *chan) |
259b6cb3 MD |
1664 | { |
1665 | int ret; | |
1666 | ||
1667 | if (!chan->sc_table) | |
1668 | return 0; | |
80f87dd2 | 1669 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1670 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1671 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1672 | if (ret) |
1673 | return ret; | |
1674 | chan->sys_enter_registered = 0; | |
1675 | } | |
1676 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1677 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1678 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1679 | if (ret) |
1680 | return ret; | |
1681 | chan->sys_exit_registered = 0; | |
1682 | } | |
badfe9f5 MD |
1683 | return 0; |
1684 | } | |
1685 | ||
2d6d88c6 | 1686 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 1687 | { |
259b6cb3 | 1688 | kfree(chan->sc_table); |
5b7ac358 | 1689 | kfree(chan->sc_exit_table); |
49c50022 MD |
1690 | #ifdef CONFIG_COMPAT |
1691 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1692 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1693 | #endif |
80f87dd2 MD |
1694 | kfree(chan->sc_filter); |
1695 | return 0; | |
1696 | } | |
1697 | ||
1698 | static | |
1699 | int get_syscall_nr(const char *syscall_name) | |
1700 | { | |
1701 | int syscall_nr = -1; | |
1702 | int i; | |
1703 | ||
1704 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
1705 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1706 | const char *it_name; |
80f87dd2 MD |
1707 | |
1708 | entry = &sc_table[i]; | |
1709 | if (!entry->desc) | |
1710 | continue; | |
5b7ac358 MD |
1711 | it_name = entry->desc->name; |
1712 | it_name += strlen(SYSCALL_ENTRY_STR); | |
1713 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1714 | syscall_nr = i; |
1715 | break; | |
1716 | } | |
1717 | } | |
1718 | return syscall_nr; | |
1719 | } | |
1720 | ||
1721 | static | |
1722 | int get_compat_syscall_nr(const char *syscall_name) | |
1723 | { | |
1724 | int syscall_nr = -1; | |
1725 | int i; | |
1726 | ||
1727 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
1728 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1729 | const char *it_name; |
80f87dd2 MD |
1730 | |
1731 | entry = &compat_sc_table[i]; | |
1732 | if (!entry->desc) | |
1733 | continue; | |
5b7ac358 MD |
1734 | it_name = entry->desc->name; |
1735 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1736 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1737 | syscall_nr = i; |
1738 | break; | |
1739 | } | |
1740 | } | |
1741 | return syscall_nr; | |
1742 | } | |
1743 | ||
12e579db MD |
1744 | static |
1745 | uint32_t get_sc_tables_len(void) | |
1746 | { | |
1747 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1748 | } | |
1749 | ||
badfe9f5 | 1750 | static |
ade8a729 FD |
1751 | const char *get_syscall_name(const char *desc_name, |
1752 | enum lttng_syscall_abi abi, | |
1753 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1754 | { |
badfe9f5 | 1755 | size_t prefix_len = 0; |
80f87dd2 | 1756 | |
80f87dd2 | 1757 | |
ade8a729 | 1758 | switch (entryexit) { |
badfe9f5 | 1759 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1760 | switch (abi) { |
badfe9f5 MD |
1761 | case LTTNG_SYSCALL_ABI_NATIVE: |
1762 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1763 | break; | |
1764 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1765 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1766 | break; | |
80f87dd2 | 1767 | } |
badfe9f5 MD |
1768 | break; |
1769 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1770 | switch (abi) { |
badfe9f5 MD |
1771 | case LTTNG_SYSCALL_ABI_NATIVE: |
1772 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1773 | break; | |
1774 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1775 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1776 | break; | |
80f87dd2 | 1777 | } |
badfe9f5 | 1778 | break; |
80f87dd2 | 1779 | } |
badfe9f5 | 1780 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1781 | return desc_name + prefix_len; |
badfe9f5 MD |
1782 | } |
1783 | ||
ade8a729 FD |
1784 | static |
1785 | int lttng_syscall_filter_enable( | |
1786 | struct lttng_syscall_filter *filter, | |
1787 | const char *desc_name, enum lttng_syscall_abi abi, | |
1788 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1789 | { |
badfe9f5 MD |
1790 | const char *syscall_name; |
1791 | unsigned long *bitmap; | |
1792 | int syscall_nr; | |
1793 | ||
ade8a729 | 1794 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1795 | |
ade8a729 | 1796 | switch (abi) { |
badfe9f5 MD |
1797 | case LTTNG_SYSCALL_ABI_NATIVE: |
1798 | syscall_nr = get_syscall_nr(syscall_name); | |
1799 | break; | |
1800 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1801 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1802 | break; | |
1803 | default: | |
1804 | return -EINVAL; | |
80f87dd2 | 1805 | } |
badfe9f5 MD |
1806 | if (syscall_nr < 0) |
1807 | return -ENOENT; | |
1808 | ||
ade8a729 | 1809 | switch (entryexit) { |
badfe9f5 | 1810 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1811 | switch (abi) { |
badfe9f5 MD |
1812 | case LTTNG_SYSCALL_ABI_NATIVE: |
1813 | bitmap = filter->sc_entry; | |
1814 | break; | |
1815 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1816 | bitmap = filter->sc_compat_entry; | |
1817 | break; | |
6d9694d8 MD |
1818 | default: |
1819 | return -EINVAL; | |
80f87dd2 | 1820 | } |
badfe9f5 MD |
1821 | break; |
1822 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1823 | switch (abi) { |
badfe9f5 MD |
1824 | case LTTNG_SYSCALL_ABI_NATIVE: |
1825 | bitmap = filter->sc_exit; | |
1826 | break; | |
1827 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1828 | bitmap = filter->sc_compat_exit; | |
1829 | break; | |
6d9694d8 MD |
1830 | default: |
1831 | return -EINVAL; | |
80f87dd2 | 1832 | } |
badfe9f5 MD |
1833 | break; |
1834 | default: | |
1835 | return -EINVAL; | |
80f87dd2 | 1836 | } |
badfe9f5 MD |
1837 | if (test_bit(syscall_nr, bitmap)) |
1838 | return -EEXIST; | |
1839 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1840 | return 0; |
80f87dd2 MD |
1841 | } |
1842 | ||
8a8ac9a8 FD |
1843 | int lttng_syscall_filter_enable_event_notifier( |
1844 | struct lttng_event_notifier *notifier) | |
1845 | { | |
1846 | struct lttng_event_notifier_group *group = notifier->group; | |
1847 | unsigned int syscall_id = notifier->u.syscall.syscall_id; | |
1848 | struct hlist_head *dispatch_list; | |
1849 | int ret = 0; | |
1850 | ||
1851 | WARN_ON_ONCE(notifier->instrumentation != LTTNG_KERNEL_SYSCALL); | |
1852 | ||
1853 | ret = lttng_syscall_filter_enable(group->sc_filter, | |
1854 | notifier->desc->name, notifier->u.syscall.abi, | |
1855 | notifier->u.syscall.entryexit); | |
1856 | if (ret) { | |
1857 | goto end; | |
1858 | } | |
1859 | ||
1860 | switch (notifier->u.syscall.entryexit) { | |
1861 | case LTTNG_SYSCALL_ENTRY: | |
1862 | switch (notifier->u.syscall.abi) { | |
1863 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1864 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1865 | break; | |
1866 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1867 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1868 | break; | |
1869 | } | |
1870 | break; | |
1871 | case LTTNG_SYSCALL_EXIT: | |
1872 | switch (notifier->u.syscall.abi) { | |
1873 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1874 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1875 | break; | |
1876 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1877 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1878 | break; | |
1879 | } | |
1880 | break; | |
1881 | } | |
1882 | ||
1883 | hlist_add_head_rcu(¬ifier->u.syscall.node, dispatch_list); | |
1884 | ||
1885 | end: | |
1886 | return ret ; | |
1887 | } | |
1888 | ||
ade8a729 FD |
1889 | int lttng_syscall_filter_enable_event( |
1890 | struct lttng_channel *channel, | |
badfe9f5 | 1891 | struct lttng_event *event) |
80f87dd2 | 1892 | { |
ade8a729 FD |
1893 | WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL); |
1894 | ||
1895 | return lttng_syscall_filter_enable(channel->sc_filter, | |
1896 | event->desc->name, event->u.syscall.abi, | |
1897 | event->u.syscall.entryexit); | |
1898 | } | |
1899 | ||
1900 | static | |
1901 | int lttng_syscall_filter_disable( | |
1902 | struct lttng_syscall_filter *filter, | |
1903 | const char *desc_name, enum lttng_syscall_abi abi, | |
1904 | enum lttng_syscall_entryexit entryexit) | |
1905 | { | |
badfe9f5 MD |
1906 | const char *syscall_name; |
1907 | unsigned long *bitmap; | |
1908 | int syscall_nr; | |
80f87dd2 | 1909 | |
ade8a729 | 1910 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1911 | |
ade8a729 | 1912 | switch (abi) { |
badfe9f5 MD |
1913 | case LTTNG_SYSCALL_ABI_NATIVE: |
1914 | syscall_nr = get_syscall_nr(syscall_name); | |
1915 | break; | |
1916 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1917 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1918 | break; | |
1919 | default: | |
1920 | return -EINVAL; | |
80f87dd2 | 1921 | } |
badfe9f5 MD |
1922 | if (syscall_nr < 0) |
1923 | return -ENOENT; | |
80f87dd2 | 1924 | |
ade8a729 | 1925 | switch (entryexit) { |
badfe9f5 | 1926 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1927 | switch (abi) { |
badfe9f5 MD |
1928 | case LTTNG_SYSCALL_ABI_NATIVE: |
1929 | bitmap = filter->sc_entry; | |
1930 | break; | |
1931 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1932 | bitmap = filter->sc_compat_entry; | |
1933 | break; | |
6d9694d8 MD |
1934 | default: |
1935 | return -EINVAL; | |
80f87dd2 | 1936 | } |
badfe9f5 MD |
1937 | break; |
1938 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1939 | switch (abi) { |
badfe9f5 MD |
1940 | case LTTNG_SYSCALL_ABI_NATIVE: |
1941 | bitmap = filter->sc_exit; | |
1942 | break; | |
1943 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1944 | bitmap = filter->sc_compat_exit; | |
1945 | break; | |
6d9694d8 MD |
1946 | default: |
1947 | return -EINVAL; | |
80f87dd2 | 1948 | } |
badfe9f5 MD |
1949 | break; |
1950 | default: | |
1951 | return -EINVAL; | |
80f87dd2 | 1952 | } |
badfe9f5 MD |
1953 | if (!test_bit(syscall_nr, bitmap)) |
1954 | return -EEXIST; | |
1955 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1956 | |
badfe9f5 | 1957 | return 0; |
259b6cb3 | 1958 | } |
2d2464bd | 1959 | |
8a8ac9a8 FD |
1960 | int lttng_syscall_filter_disable_event_notifier( |
1961 | struct lttng_event_notifier *notifier) | |
1962 | { | |
1963 | struct lttng_event_notifier_group *group = notifier->group; | |
1964 | int ret; | |
1965 | ||
1966 | WARN_ON_ONCE(notifier->instrumentation != LTTNG_KERNEL_SYSCALL); | |
1967 | ||
1968 | ret = lttng_syscall_filter_disable(group->sc_filter, | |
1969 | notifier->desc->name, notifier->u.syscall.abi, | |
1970 | notifier->u.syscall.entryexit); | |
1971 | WARN_ON_ONCE(ret != 0); | |
1972 | ||
1973 | hlist_del_rcu(¬ifier->u.syscall.node); | |
1974 | return 0; | |
1975 | } | |
1976 | ||
ade8a729 FD |
1977 | int lttng_syscall_filter_disable_event( |
1978 | struct lttng_channel *channel, | |
1979 | struct lttng_event *event) | |
1980 | { | |
1981 | return lttng_syscall_filter_disable(channel->sc_filter, | |
1982 | event->desc->name, event->u.syscall.abi, | |
1983 | event->u.syscall.entryexit); | |
1984 | } | |
1985 | ||
2d2464bd MD |
1986 | static |
1987 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1988 | { | |
1989 | const struct trace_syscall_entry *entry; | |
1990 | int iter = 0; | |
1991 | ||
1992 | for (entry = sc_table; | |
1993 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1994 | entry++) { | |
1995 | if (iter++ >= *pos) | |
1996 | return entry; | |
1997 | } | |
1998 | for (entry = compat_sc_table; | |
1999 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
2000 | entry++) { | |
2001 | if (iter++ >= *pos) | |
2002 | return entry; | |
2003 | } | |
2004 | /* End of list */ | |
2005 | return NULL; | |
2006 | } | |
2007 | ||
2008 | static | |
2009 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
2010 | { | |
2011 | return (void *) syscall_list_get_entry(pos); | |
2012 | } | |
2013 | ||
2014 | static | |
2015 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
2016 | { | |
2017 | (*ppos)++; | |
2018 | return (void *) syscall_list_get_entry(ppos); | |
2019 | } | |
2020 | ||
2021 | static | |
2022 | void syscall_list_stop(struct seq_file *m, void *p) | |
2023 | { | |
2024 | } | |
2025 | ||
12e579db MD |
2026 | static |
2027 | int get_sc_table(const struct trace_syscall_entry *entry, | |
2028 | const struct trace_syscall_entry **table, | |
2029 | unsigned int *bitness) | |
2030 | { | |
2031 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
2032 | if (bitness) | |
2033 | *bitness = BITS_PER_LONG; | |
2034 | if (table) | |
2035 | *table = sc_table; | |
2036 | return 0; | |
2037 | } | |
2038 | if (!(entry >= compat_sc_table | |
2039 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
2040 | return -EINVAL; | |
2041 | } | |
2042 | if (bitness) | |
2043 | *bitness = 32; | |
2044 | if (table) | |
2045 | *table = compat_sc_table; | |
2046 | return 0; | |
2047 | } | |
2048 | ||
2d2464bd MD |
2049 | static |
2050 | int syscall_list_show(struct seq_file *m, void *p) | |
2051 | { | |
2052 | const struct trace_syscall_entry *table, *entry = p; | |
2053 | unsigned int bitness; | |
d4291869 | 2054 | unsigned long index; |
12e579db | 2055 | int ret; |
d4291869 | 2056 | const char *name; |
2d2464bd | 2057 | |
12e579db MD |
2058 | ret = get_sc_table(entry, &table, &bitness); |
2059 | if (ret) | |
2060 | return ret; | |
f4855b46 MD |
2061 | if (!entry->desc) |
2062 | return 0; | |
d4291869 MD |
2063 | if (table == sc_table) { |
2064 | index = entry - table; | |
2065 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
2066 | } else { | |
2067 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
2068 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
2069 | } | |
12e579db | 2070 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 2071 | index, name, bitness); |
2d2464bd MD |
2072 | return 0; |
2073 | } | |
2074 | ||
2075 | static | |
2076 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
2077 | .start = syscall_list_start, | |
2078 | .next = syscall_list_next, | |
2079 | .stop = syscall_list_stop, | |
2080 | .show = syscall_list_show, | |
2081 | }; | |
2082 | ||
2083 | static | |
2084 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
2085 | { | |
2086 | return seq_open(file, <tng_syscall_list_seq_ops); | |
2087 | } | |
2088 | ||
2089 | const struct file_operations lttng_syscall_list_fops = { | |
2090 | .owner = THIS_MODULE, | |
2091 | .open = lttng_syscall_list_open, | |
2092 | .read = seq_read, | |
2093 | .llseek = seq_lseek, | |
2094 | .release = seq_release, | |
2095 | }; | |
12e579db | 2096 | |
badfe9f5 MD |
2097 | /* |
2098 | * A syscall is enabled if it is traced for either entry or exit. | |
2099 | */ | |
12e579db MD |
2100 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
2101 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
2102 | { | |
2103 | uint32_t len, sc_tables_len, bitmask_len; | |
2104 | int ret = 0, bit; | |
2105 | char *tmp_mask; | |
2106 | struct lttng_syscall_filter *filter; | |
2107 | ||
2108 | ret = get_user(len, &usyscall_mask->len); | |
2109 | if (ret) | |
2110 | return ret; | |
2111 | sc_tables_len = get_sc_tables_len(); | |
2112 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
2113 | if (len < sc_tables_len) { | |
2114 | return put_user(sc_tables_len, &usyscall_mask->len); | |
2115 | } | |
2116 | /* Array is large enough, we can copy array to user-space. */ | |
2117 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
2118 | if (!tmp_mask) | |
2119 | return -ENOMEM; | |
2120 | filter = channel->sc_filter; | |
2121 | ||
2122 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 2123 | char state; |
2f25059d MD |
2124 | |
2125 | if (channel->sc_table) { | |
badfe9f5 MD |
2126 | if (!READ_ONCE(channel->syscall_all) && filter) |
2127 | state = test_bit(bit, filter->sc_entry) | |
2128 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
2129 | else |
2130 | state = 1; | |
2131 | } else { | |
2132 | state = 0; | |
2133 | } | |
2134 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
2135 | } |
2136 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 2137 | char state; |
2f25059d MD |
2138 | |
2139 | if (channel->compat_sc_table) { | |
badfe9f5 | 2140 | if (!READ_ONCE(channel->syscall_all) && filter) |
2f25059d | 2141 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
badfe9f5 MD |
2142 | filter->sc_compat_entry) |
2143 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
2144 | filter->sc_compat_exit); | |
2f25059d MD |
2145 | else |
2146 | state = 1; | |
2147 | } else { | |
2148 | state = 0; | |
2149 | } | |
2150 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
2151 | } |
2152 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
2153 | ret = -EFAULT; | |
2154 | kfree(tmp_mask); | |
2155 | return ret; | |
2156 | } | |
082d4946 MD |
2157 | |
2158 | int lttng_abi_syscall_list(void) | |
2159 | { | |
2160 | struct file *syscall_list_file; | |
2161 | int file_fd, ret; | |
2162 | ||
4ac10b76 | 2163 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
2164 | if (file_fd < 0) { |
2165 | ret = file_fd; | |
2166 | goto fd_error; | |
2167 | } | |
2168 | ||
2169 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
2170 | <tng_syscall_list_fops, | |
2171 | NULL, O_RDWR); | |
2172 | if (IS_ERR(syscall_list_file)) { | |
2173 | ret = PTR_ERR(syscall_list_file); | |
2174 | goto file_error; | |
2175 | } | |
2176 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
2177 | if (ret < 0) | |
2178 | goto open_error; | |
2179 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
2180 | return file_fd; |
2181 | ||
2182 | open_error: | |
2183 | fput(syscall_list_file); | |
2184 | file_error: | |
2185 | put_unused_fd(file_fd); | |
2186 | fd_error: | |
2187 | return ret; | |
2188 | } |