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> |
1ea8aa0a | 32 | #include <lttng/events-internal.h> |
8a8ac9a8 | 33 | #include <lttng/utils.h> |
259b6cb3 | 34 | |
6333ace3 | 35 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
36 | # ifndef is_compat_task |
37 | # define is_compat_task() (0) | |
38 | # endif | |
6333ace3 MD |
39 | #endif |
40 | ||
1aa3298b MD |
41 | /* in_compat_syscall appears in kernel 4.6. */ |
42 | #ifndef in_compat_syscall | |
43 | #define in_compat_syscall() is_compat_task() | |
44 | #endif | |
45 | ||
5b7ac358 MD |
46 | enum sc_type { |
47 | SC_TYPE_ENTRY, | |
48 | SC_TYPE_EXIT, | |
49 | SC_TYPE_COMPAT_ENTRY, | |
50 | SC_TYPE_COMPAT_EXIT, | |
51 | }; | |
52 | ||
d4291869 MD |
53 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
54 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
55 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
56 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
57 | ||
58 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
59 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
60 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
61 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 62 | |
a93244f8 | 63 | static |
2d6d88c6 | 64 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 | 65 | static |
2d6d88c6 | 66 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 67 | |
8a8ac9a8 FD |
68 | static |
69 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, | |
70 | long id); | |
71 | static | |
72 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
73 | long ret); | |
74 | ||
3a523f5b MD |
75 | /* |
76 | * Forward declarations for old kernels. | |
77 | */ | |
78 | struct mmsghdr; | |
79 | struct rlimit64; | |
80 | struct oldold_utsname; | |
81 | struct old_utsname; | |
82 | struct sel_arg_struct; | |
83 | struct mmap_arg_struct; | |
c0b71117 | 84 | struct file_handle; |
a292e6f1 | 85 | struct user_msghdr; |
3a523f5b | 86 | |
9eb15e8b MJ |
87 | /* |
88 | * Forward declaration for kernels >= 5.6 | |
89 | */ | |
90 | struct timex; | |
edfdcb68 MJ |
91 | struct timeval; |
92 | struct itimerval; | |
93 | struct itimerspec; | |
94 | ||
5f4c791e | 95 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
96 | typedef __kernel_old_time_t time_t; |
97 | #endif | |
9eb15e8b | 98 | |
80f87dd2 MD |
99 | #ifdef IA32_NR_syscalls |
100 | #define NR_compat_syscalls IA32_NR_syscalls | |
101 | #else | |
102 | #define NR_compat_syscalls NR_syscalls | |
103 | #endif | |
104 | ||
259b6cb3 MD |
105 | /* |
106 | * Create LTTng tracepoint probes. | |
107 | */ | |
108 | #define LTTNG_PACKAGE_BUILD | |
109 | #define CREATE_TRACE_POINTS | |
2655f9ad | 110 | #define TP_MODULE_NOINIT |
c075712b | 111 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 112 | |
a93244f8 MD |
113 | #define PARAMS(args...) args |
114 | ||
5b7ac358 | 115 | /* Handle unknown syscalls */ |
72a52753 | 116 | #undef TRACE_SYSTEM |
5b7ac358 | 117 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 118 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
119 | #undef TRACE_SYSTEM |
120 | ||
fc4f7161 MD |
121 | #define SC_ENTER |
122 | ||
fc4f7161 MD |
123 | #undef sc_exit |
124 | #define sc_exit(...) | |
b75d00c4 MD |
125 | #undef sc_in |
126 | #define sc_in(...) __VA_ARGS__ | |
127 | #undef sc_out | |
128 | #define sc_out(...) | |
129 | #undef sc_inout | |
130 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
131 | |
132 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 133 | #undef TP_PROBE_CB |
2d6d88c6 | 134 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
57ede728 | 135 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 136 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 137 | PARAMS(_fields)) |
265822ae | 138 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 139 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
140 | PARAMS(_locvar), PARAMS(_code_pre), \ |
141 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
142 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
143 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 144 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 145 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
146 | /* Enumerations only defined at first inclusion. */ |
147 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
148 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 149 | #undef TRACE_SYSTEM |
d4291869 | 150 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 151 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 152 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 153 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 154 | #undef TRACE_SYSTEM |
d4291869 | 155 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 156 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 157 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 158 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 159 | #undef TRACE_SYSTEM |
141ddf28 | 160 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
161 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
162 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
163 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
164 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 165 | #undef TP_PROBE_CB |
3bc29f0a MD |
166 | #undef _TRACE_SYSCALLS_INTEGERS_H |
167 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
168 | |
169 | /* Hijack probe callback for compat system call enter */ | |
2d6d88c6 | 170 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
771af27e | 171 | #define LTTNG_SC_COMPAT |
57ede728 | 172 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 173 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 174 | PARAMS(_fields)) |
265822ae | 175 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 176 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 177 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
178 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
179 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 180 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
181 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
182 | compat_syscall_entry_##_name) | |
141ddf28 MD |
183 | /* Enumerations only defined at inital inclusion (not here). */ |
184 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 185 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 186 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 187 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
188 | #undef TRACE_INCLUDE_FILE |
189 | #undef TRACE_SYSTEM | |
d4291869 | 190 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 191 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 192 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
193 | #undef TRACE_INCLUDE_FILE |
194 | #undef TRACE_SYSTEM | |
141ddf28 | 195 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
196 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
197 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
198 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
199 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 200 | #undef TP_PROBE_CB |
3bc29f0a MD |
201 | #undef _TRACE_SYSCALLS_INTEGERS_H |
202 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 203 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 204 | |
fc4f7161 MD |
205 | #undef SC_ENTER |
206 | ||
207 | #define SC_EXIT | |
208 | ||
fc4f7161 MD |
209 | #undef sc_exit |
210 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
211 | #undef sc_in |
212 | #define sc_in(...) | |
213 | #undef sc_out | |
214 | #define sc_out(...) __VA_ARGS__ | |
215 | #undef sc_inout | |
216 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
217 | |
218 | /* Hijack probe callback for system call exit */ | |
2d6d88c6 | 219 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
57ede728 | 220 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 221 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 222 | PARAMS(_fields)) |
265822ae | 223 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 224 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 225 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
226 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
227 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
228 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
229 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 230 | syscall_exit_##_name) |
141ddf28 MD |
231 | /* Enumerations only defined at inital inclusion (not here). */ |
232 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
233 | #define TRACE_SYSTEM syscall_exit_integers |
234 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 235 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
236 | #undef TRACE_INCLUDE_FILE |
237 | #undef TRACE_SYSTEM | |
238 | #define TRACE_SYSTEM syscall_exit_pointers | |
239 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 240 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
241 | #undef TRACE_INCLUDE_FILE |
242 | #undef TRACE_SYSTEM | |
141ddf28 | 243 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
244 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
245 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
246 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
247 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 248 | #undef TP_PROBE_CB |
3bc29f0a MD |
249 | #undef _TRACE_SYSCALLS_INTEGERS_H |
250 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
251 | |
252 | ||
253 | /* Hijack probe callback for compat system call exit */ | |
2d6d88c6 | 254 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
771af27e | 255 | #define LTTNG_SC_COMPAT |
57ede728 | 256 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 257 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 258 | PARAMS(_fields)) |
265822ae | 259 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 260 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 261 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
262 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
263 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 264 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 265 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 266 | compat_syscall_exit_##_name) |
141ddf28 MD |
267 | /* Enumerations only defined at inital inclusion (not here). */ |
268 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
269 | #define TRACE_SYSTEM compat_syscall_exit_integers |
270 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 271 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 272 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 273 | #undef TRACE_SYSTEM |
5b7ac358 MD |
274 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
275 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 276 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 277 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 278 | #undef TRACE_SYSTEM |
141ddf28 | 279 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
280 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
281 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
282 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
283 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 284 | #undef TP_PROBE_CB |
3bc29f0a MD |
285 | #undef _TRACE_SYSCALLS_INTEGERS_H |
286 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 287 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 288 | |
fc4f7161 | 289 | #undef SC_EXIT |
259b6cb3 | 290 | |
2655f9ad | 291 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
292 | #undef LTTNG_PACKAGE_BUILD |
293 | #undef CREATE_TRACE_POINTS | |
294 | ||
a93244f8 | 295 | struct trace_syscall_entry { |
2d6d88c6 | 296 | void *event_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, \ |
259b6cb3 | 313 | .nrargs = (_nrargs), \ |
d4291869 MD |
314 | .fields = __event_fields___syscall_entry_##_template, \ |
315 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
316 | }, |
317 | ||
2d6d88c6 | 318 | /* Event syscall enter tracing table */ |
49c50022 | 319 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
320 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
321 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
322 | }; |
323 | ||
a93244f8 MD |
324 | #undef TRACE_SYSCALL_TABLE |
325 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
326 | [ _nr ] = { \ | |
2d6d88c6 | 327 | .event_func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 328 | .nrargs = (_nrargs), \ |
d4291869 MD |
329 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
330 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
331 | }, |
332 | ||
2d6d88c6 | 333 | /* Event compat syscall enter table */ |
a93244f8 | 334 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
335 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
336 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 337 | }; |
259b6cb3 | 338 | |
fc4f7161 MD |
339 | #undef SC_ENTER |
340 | ||
341 | #define SC_EXIT | |
342 | ||
343 | #undef sc_exit | |
344 | #define sc_exit(...) __VA_ARGS__ | |
345 | ||
5b7ac358 MD |
346 | #undef TRACE_SYSCALL_TABLE |
347 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
348 | [ _nr ] = { \ | |
2d6d88c6 | 349 | .event_func = __event_probe__syscall_exit_##_template, \ |
5b7ac358 MD |
350 | .nrargs = (_nrargs), \ |
351 | .fields = __event_fields___syscall_exit_##_template, \ | |
352 | .desc = &__event_desc___syscall_exit_##_name, \ | |
353 | }, | |
354 | ||
2d6d88c6 | 355 | /* Event syscall exit table */ |
5b7ac358 | 356 | static const struct trace_syscall_entry sc_exit_table[] = { |
241ae9a8 MD |
357 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
358 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
359 | }; |
360 | ||
361 | #undef TRACE_SYSCALL_TABLE | |
362 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
363 | [ _nr ] = { \ | |
2d6d88c6 | 364 | .event_func = __event_probe__compat_syscall_exit_##_template, \ |
5b7ac358 MD |
365 | .nrargs = (_nrargs), \ |
366 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
367 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
368 | }, | |
369 | ||
2d6d88c6 | 370 | /* Event compat syscall exit table */ |
5b7ac358 | 371 | const struct trace_syscall_entry compat_sc_exit_table[] = { |
241ae9a8 MD |
372 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
373 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
374 | }; |
375 | ||
fc4f7161 MD |
376 | #undef SC_EXIT |
377 | ||
a93244f8 | 378 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 379 | |
80f87dd2 | 380 | struct lttng_syscall_filter { |
badfe9f5 MD |
381 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
382 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
383 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
384 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
385 | }; |
386 | ||
3b82c4e1 | 387 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 388 | struct pt_regs *regs, long id) |
f405cfce | 389 | { |
1b7b9c65 | 390 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 391 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 392 | |
1b7b9c65 | 393 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 394 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 395 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 396 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 397 | else |
e2d5dbc7 | 398 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
399 | } |
400 | } | |
401 | ||
63aa9160 | 402 | static __always_inline |
e2d5dbc7 | 403 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 404 | void *func, unsigned int nrargs, |
63aa9160 | 405 | struct pt_regs *regs) |
259b6cb3 | 406 | { |
a67ba386 | 407 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 408 | |
63aa9160 | 409 | switch (nrargs) { |
259b6cb3 MD |
410 | case 0: |
411 | { | |
63aa9160 | 412 | void (*fptr)(void *__data) = func; |
259b6cb3 | 413 | |
e2d5dbc7 MD |
414 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
415 | fptr(event_priv->pub); | |
259b6cb3 MD |
416 | break; |
417 | } | |
418 | case 1: | |
419 | { | |
63aa9160 | 420 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 421 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 422 | |
1b7b9c65 | 423 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
424 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
425 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
426 | break; |
427 | } | |
428 | case 2: | |
429 | { | |
430 | void (*fptr)(void *__data, | |
431 | unsigned long arg0, | |
63aa9160 | 432 | unsigned long arg1) = func; |
1b7b9c65 | 433 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 434 | |
1b7b9c65 | 435 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
436 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
437 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
438 | break; |
439 | } | |
440 | case 3: | |
441 | { | |
442 | void (*fptr)(void *__data, | |
443 | unsigned long arg0, | |
444 | unsigned long arg1, | |
63aa9160 | 445 | unsigned long arg2) = func; |
1b7b9c65 | 446 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 447 | |
1b7b9c65 | 448 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
449 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
450 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
451 | break; |
452 | } | |
453 | case 4: | |
454 | { | |
455 | void (*fptr)(void *__data, | |
456 | unsigned long arg0, | |
457 | unsigned long arg1, | |
458 | unsigned long arg2, | |
63aa9160 | 459 | unsigned long arg3) = func; |
1b7b9c65 | 460 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 461 | |
1b7b9c65 | 462 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
463 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
464 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
465 | break; |
466 | } | |
467 | case 5: | |
468 | { | |
469 | void (*fptr)(void *__data, | |
470 | unsigned long arg0, | |
471 | unsigned long arg1, | |
472 | unsigned long arg2, | |
473 | unsigned long arg3, | |
63aa9160 | 474 | unsigned long arg4) = func; |
1b7b9c65 | 475 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 476 | |
1b7b9c65 | 477 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
478 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
479 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
480 | break; |
481 | } | |
482 | case 6: | |
483 | { | |
484 | void (*fptr)(void *__data, | |
485 | unsigned long arg0, | |
486 | unsigned long arg1, | |
487 | unsigned long arg2, | |
488 | unsigned long arg3, | |
489 | unsigned long arg4, | |
63aa9160 | 490 | unsigned long arg5) = func; |
1b7b9c65 | 491 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 492 | |
1b7b9c65 | 493 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
494 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
495 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 496 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
497 | break; |
498 | } | |
499 | default: | |
500 | break; | |
501 | } | |
502 | } | |
503 | ||
63aa9160 FD |
504 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
505 | { | |
506 | struct lttng_channel *chan = __data; | |
3b82c4e1 | 507 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
508 | const struct trace_syscall_entry *table, *entry; |
509 | size_t table_len; | |
510 | ||
511 | if (unlikely(in_compat_syscall())) { | |
512 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
513 | ||
514 | if (id < 0 || id >= NR_compat_syscalls | |
3b82c4e1 | 515 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
516 | /* System call filtered out. */ |
517 | return; | |
518 | } | |
519 | table = compat_sc_table; | |
520 | table_len = ARRAY_SIZE(compat_sc_table); | |
3b82c4e1 | 521 | unknown_action_list = &chan->sc_compat_unknown; |
63aa9160 FD |
522 | } else { |
523 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
524 | ||
525 | if (id < 0 || id >= NR_syscalls | |
3b82c4e1 | 526 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
527 | /* System call filtered out. */ |
528 | return; | |
529 | } | |
530 | table = sc_table; | |
531 | table_len = ARRAY_SIZE(sc_table); | |
3b82c4e1 | 532 | unknown_action_list = &chan->sc_unknown; |
63aa9160 FD |
533 | } |
534 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 535 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
536 | return; |
537 | } | |
3b82c4e1 MD |
538 | |
539 | entry = &table[id]; | |
540 | if (!entry->event_func) { | |
541 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
542 | return; |
543 | } | |
3b82c4e1 MD |
544 | |
545 | if (unlikely(in_compat_syscall())) { | |
546 | action_list = &chan->compat_sc_table[id]; | |
547 | } else { | |
548 | action_list = &chan->sc_table[id]; | |
549 | } | |
550 | if (unlikely(hlist_empty(action_list))) | |
551 | return; | |
552 | ||
e2d5dbc7 | 553 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
554 | } |
555 | ||
8a8ac9a8 FD |
556 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
557 | long id) | |
558 | { | |
559 | struct lttng_event_notifier_group *group = __data; | |
560 | const struct trace_syscall_entry *table, *entry; | |
561 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
562 | size_t table_len; | |
563 | ||
564 | if (unlikely(in_compat_syscall())) { | |
565 | struct lttng_syscall_filter *filter = group->sc_filter; | |
566 | ||
567 | if (id < 0 || id >= NR_compat_syscalls | |
568 | || (!READ_ONCE(group->syscall_all_entry) && | |
569 | !test_bit(id, filter->sc_compat_entry))) { | |
570 | /* System call filtered out. */ | |
571 | return; | |
572 | } | |
573 | table = compat_sc_table; | |
574 | table_len = ARRAY_SIZE(compat_sc_table); | |
575 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
576 | } else { | |
577 | struct lttng_syscall_filter *filter = group->sc_filter; | |
578 | ||
579 | if (id < 0 || id >= NR_syscalls | |
580 | || (!READ_ONCE(group->syscall_all_entry) && | |
581 | !test_bit(id, filter->sc_entry))) { | |
582 | /* System call filtered out. */ | |
583 | return; | |
584 | } | |
585 | table = sc_table; | |
586 | table_len = ARRAY_SIZE(sc_table); | |
587 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
588 | } | |
589 | /* Check if the syscall id is out of bound. */ | |
590 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 591 | syscall_entry_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
592 | regs, id); |
593 | return; | |
594 | } | |
595 | ||
596 | entry = &table[id]; | |
e2d5dbc7 MD |
597 | if (!entry->event_func) { |
598 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
599 | regs, id); |
600 | return; | |
601 | } | |
602 | ||
603 | if (unlikely(in_compat_syscall())) { | |
604 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
605 | } else { | |
606 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
607 | } | |
608 | if (unlikely(hlist_empty(dispatch_list))) | |
609 | return; | |
610 | ||
e2d5dbc7 MD |
611 | syscall_entry_event_call_func(dispatch_list, |
612 | entry->event_func, entry->nrargs, regs); | |
8a8ac9a8 FD |
613 | } |
614 | ||
3b82c4e1 | 615 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 616 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 617 | { |
1b7b9c65 | 618 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 619 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 620 | |
1b7b9c65 | 621 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 622 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 623 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 624 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
625 | args); |
626 | else | |
e2d5dbc7 | 627 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 628 | } |
5b7ac358 MD |
629 | } |
630 | ||
3b82c4e1 | 631 | static __always_inline |
e2d5dbc7 | 632 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
633 | void *func, unsigned int nrargs, |
634 | struct pt_regs *regs, long ret) | |
5b7ac358 | 635 | { |
a67ba386 | 636 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 637 | |
3b82c4e1 | 638 | switch (nrargs) { |
5b7ac358 MD |
639 | case 0: |
640 | { | |
3b82c4e1 | 641 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 642 | |
e2d5dbc7 MD |
643 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
644 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
645 | break; |
646 | } | |
647 | case 1: | |
648 | { | |
649 | void (*fptr)(void *__data, | |
fc4f7161 | 650 | long ret, |
3b82c4e1 | 651 | unsigned long arg0) = func; |
1b7b9c65 | 652 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 653 | |
1b7b9c65 | 654 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
655 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
656 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
657 | break; |
658 | } | |
659 | case 2: | |
660 | { | |
661 | void (*fptr)(void *__data, | |
fc4f7161 | 662 | long ret, |
5b7ac358 | 663 | unsigned long arg0, |
3b82c4e1 | 664 | unsigned long arg1) = func; |
1b7b9c65 | 665 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 666 | |
1b7b9c65 | 667 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
668 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
669 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
670 | break; |
671 | } | |
672 | case 3: | |
673 | { | |
674 | void (*fptr)(void *__data, | |
fc4f7161 | 675 | long ret, |
5b7ac358 MD |
676 | unsigned long arg0, |
677 | unsigned long arg1, | |
3b82c4e1 | 678 | unsigned long arg2) = func; |
1b7b9c65 | 679 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 680 | |
1b7b9c65 | 681 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
682 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
683 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
684 | break; |
685 | } | |
686 | case 4: | |
687 | { | |
688 | void (*fptr)(void *__data, | |
fc4f7161 | 689 | long ret, |
5b7ac358 MD |
690 | unsigned long arg0, |
691 | unsigned long arg1, | |
692 | unsigned long arg2, | |
3b82c4e1 | 693 | unsigned long arg3) = func; |
1b7b9c65 | 694 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 695 | |
1b7b9c65 | 696 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
697 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
698 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
699 | break; |
700 | } | |
701 | case 5: | |
702 | { | |
703 | void (*fptr)(void *__data, | |
fc4f7161 | 704 | long ret, |
5b7ac358 MD |
705 | unsigned long arg0, |
706 | unsigned long arg1, | |
707 | unsigned long arg2, | |
708 | unsigned long arg3, | |
3b82c4e1 | 709 | unsigned long arg4) = func; |
1b7b9c65 | 710 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 711 | |
1b7b9c65 | 712 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
713 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
714 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
715 | break; |
716 | } | |
717 | case 6: | |
718 | { | |
719 | void (*fptr)(void *__data, | |
fc4f7161 | 720 | long ret, |
5b7ac358 MD |
721 | unsigned long arg0, |
722 | unsigned long arg1, | |
723 | unsigned long arg2, | |
724 | unsigned long arg3, | |
725 | unsigned long arg4, | |
3b82c4e1 | 726 | unsigned long arg5) = func; |
1b7b9c65 | 727 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 728 | |
1b7b9c65 | 729 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
730 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
731 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 732 | args[3], args[4], args[5]); |
5b7ac358 MD |
733 | break; |
734 | } | |
735 | default: | |
736 | break; | |
737 | } | |
738 | } | |
739 | ||
3b82c4e1 MD |
740 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
741 | { | |
742 | struct lttng_channel *chan = __data; | |
743 | struct hlist_head *action_list, *unknown_action_list; | |
744 | const struct trace_syscall_entry *table, *entry; | |
745 | size_t table_len; | |
746 | long id; | |
747 | ||
748 | id = syscall_get_nr(current, regs); | |
749 | ||
750 | if (unlikely(in_compat_syscall())) { | |
751 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
752 | ||
753 | if (id < 0 || id >= NR_compat_syscalls | |
754 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { | |
755 | /* System call filtered out. */ | |
756 | return; | |
757 | } | |
758 | table = compat_sc_exit_table; | |
759 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
760 | unknown_action_list = &chan->compat_sc_exit_unknown; | |
761 | } else { | |
762 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
763 | ||
764 | if (id < 0 || id >= NR_syscalls | |
765 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { | |
766 | /* System call filtered out. */ | |
767 | return; | |
768 | } | |
769 | table = sc_exit_table; | |
770 | table_len = ARRAY_SIZE(sc_exit_table); | |
771 | unknown_action_list = &chan->sc_exit_unknown; | |
772 | } | |
773 | if (unlikely(id < 0 || id >= table_len)) { | |
774 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
775 | return; | |
776 | } | |
777 | ||
778 | entry = &table[id]; | |
779 | if (!entry->event_func) { | |
780 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
781 | return; | |
782 | } | |
783 | ||
784 | if (unlikely(in_compat_syscall())) { | |
785 | action_list = &chan->compat_sc_exit_table[id]; | |
786 | } else { | |
787 | action_list = &chan->sc_exit_table[id]; | |
788 | } | |
789 | if (unlikely(hlist_empty(action_list))) | |
790 | return; | |
791 | ||
e2d5dbc7 | 792 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
793 | regs, ret); |
794 | } | |
795 | ||
8a8ac9a8 FD |
796 | static |
797 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
798 | long ret) | |
799 | { | |
800 | struct lttng_event_notifier_group *group = __data; | |
801 | const struct trace_syscall_entry *table, *entry; | |
802 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
803 | size_t table_len; | |
804 | long id; | |
805 | ||
806 | id = syscall_get_nr(current, regs); | |
807 | ||
808 | if (unlikely(in_compat_syscall())) { | |
809 | struct lttng_syscall_filter *filter = group->sc_filter; | |
810 | ||
811 | if (id < 0 || id >= NR_compat_syscalls | |
812 | || (!READ_ONCE(group->syscall_all_exit) && | |
813 | !test_bit(id, filter->sc_compat_exit))) { | |
814 | /* System call filtered out. */ | |
815 | return; | |
816 | } | |
817 | table = compat_sc_exit_table; | |
818 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
819 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
820 | } else { | |
821 | struct lttng_syscall_filter *filter = group->sc_filter; | |
822 | ||
823 | if (id < 0 || id >= NR_syscalls | |
824 | || (!READ_ONCE(group->syscall_all_exit) && | |
825 | !test_bit(id, filter->sc_exit))) { | |
826 | /* System call filtered out. */ | |
827 | return; | |
828 | } | |
829 | table = sc_exit_table; | |
830 | table_len = ARRAY_SIZE(sc_exit_table); | |
831 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
832 | } | |
833 | /* Check if the syscall id is out of bound. */ | |
834 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 835 | syscall_exit_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
836 | regs, id, ret); |
837 | return; | |
838 | } | |
839 | ||
840 | entry = &table[id]; | |
e2d5dbc7 MD |
841 | if (!entry->event_func) { |
842 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
843 | regs, id); |
844 | return; | |
845 | } | |
846 | ||
847 | if (unlikely(in_compat_syscall())) { | |
848 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
849 | } else { | |
850 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
851 | } | |
852 | if (unlikely(hlist_empty(dispatch_list))) | |
853 | return; | |
854 | ||
e2d5dbc7 MD |
855 | syscall_exit_event_call_func(dispatch_list, |
856 | entry->event_func, entry->nrargs, regs, ret); | |
8a8ac9a8 | 857 | } |
33a39a3c MD |
858 | /* |
859 | * noinline to diminish caller stack size. | |
860 | * Should be called with sessions lock held. | |
861 | */ | |
49c50022 | 862 | static |
3b82c4e1 MD |
863 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
864 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
a67ba386 | 865 | enum sc_type type) |
259b6cb3 | 866 | { |
3b82c4e1 | 867 | struct lttng_channel *chan = event_enabler->chan; |
a40e3229 | 868 | struct lttng_kernel_session *session = chan->session; |
259b6cb3 | 869 | unsigned int i; |
49c50022 | 870 | |
3b82c4e1 | 871 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 872 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 873 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
606828e4 | 874 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
875 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
876 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
877 | struct hlist_head *head; |
878 | bool found = false; | |
49c50022 MD |
879 | |
880 | if (!desc) { | |
881 | /* Unknown syscall */ | |
882 | continue; | |
883 | } | |
3b82c4e1 MD |
884 | if (lttng_desc_match_enabler(desc, |
885 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
886 | continue; | |
49c50022 | 887 | /* |
3b82c4e1 | 888 | * Check if already created. |
49c50022 | 889 | */ |
3b82c4e1 | 890 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 891 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 892 | desc->event_name); |
a67ba386 MD |
893 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
894 | if (event_recorder_priv->parent.desc == desc | |
895 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3b82c4e1 MD |
896 | found = true; |
897 | } | |
898 | if (found) | |
49c50022 | 899 | continue; |
3b82c4e1 MD |
900 | |
901 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 902 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
903 | switch (type) { |
904 | case SC_TYPE_ENTRY: | |
606828e4 MD |
905 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
906 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
907 | break; |
908 | case SC_TYPE_EXIT: | |
606828e4 MD |
909 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
910 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
911 | break; |
912 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
913 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
914 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
915 | break; |
916 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
917 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
918 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
919 | break; |
920 | } | |
606828e4 MD |
921 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
922 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
923 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
a67ba386 MD |
924 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, ev.instrumentation); |
925 | WARN_ON_ONCE(!event_recorder); | |
926 | if (IS_ERR(event_recorder)) { | |
49c50022 MD |
927 | /* |
928 | * If something goes wrong in event registration | |
929 | * after the first one, we have no choice but to | |
930 | * leave the previous events in there, until | |
931 | * deleted by session teardown. | |
932 | */ | |
a67ba386 | 933 | return PTR_ERR(event_recorder); |
49c50022 | 934 | } |
a67ba386 | 935 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
936 | } |
937 | return 0; | |
938 | } | |
939 | ||
33a39a3c MD |
940 | /* |
941 | * Should be called with sessions lock held. | |
942 | */ | |
a67ba386 | 943 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler) |
49c50022 | 944 | { |
3b82c4e1 | 945 | struct lttng_channel *chan = event_enabler->chan; |
606828e4 | 946 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
947 | int ret; |
948 | ||
263b6c88 | 949 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
950 | |
951 | if (!chan->sc_table) { | |
952 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 953 | chan->sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
259b6cb3 MD |
954 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
955 | if (!chan->sc_table) | |
956 | return -ENOMEM; | |
957 | } | |
5b7ac358 MD |
958 | if (!chan->sc_exit_table) { |
959 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 960 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
5b7ac358 MD |
961 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); |
962 | if (!chan->sc_exit_table) | |
963 | return -ENOMEM; | |
964 | } | |
965 | ||
259b6cb3 | 966 | |
49c50022 MD |
967 | #ifdef CONFIG_COMPAT |
968 | if (!chan->compat_sc_table) { | |
969 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 970 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
a93244f8 | 971 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
972 | if (!chan->compat_sc_table) |
973 | return -ENOMEM; | |
974 | } | |
5b7ac358 MD |
975 | |
976 | if (!chan->compat_sc_exit_table) { | |
977 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 978 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
5b7ac358 MD |
979 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); |
980 | if (!chan->compat_sc_exit_table) | |
981 | return -ENOMEM; | |
982 | } | |
49c50022 | 983 | #endif |
3b82c4e1 | 984 | if (hlist_empty(&chan->sc_unknown)) { |
437d5aa5 | 985 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 986 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 987 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a | 988 | |
f405cfce | 989 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
990 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
991 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
992 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
993 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
994 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 995 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 996 | ev.instrumentation); |
a67ba386 MD |
997 | WARN_ON_ONCE(!event_recorder); |
998 | if (IS_ERR(event_recorder)) { | |
999 | return PTR_ERR(event_recorder); | |
f405cfce | 1000 | } |
a67ba386 | 1001 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_unknown); |
f405cfce MD |
1002 | } |
1003 | ||
3b82c4e1 | 1004 | if (hlist_empty(&chan->sc_compat_unknown)) { |
437d5aa5 | 1005 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 1006 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 1007 | struct lttng_kernel_event_recorder *event_recorder; |
b76dc1a0 MD |
1008 | |
1009 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1010 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1011 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1012 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1013 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
1014 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 1015 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1016 | ev.instrumentation); |
a67ba386 MD |
1017 | WARN_ON_ONCE(!event_recorder); |
1018 | if (IS_ERR(event_recorder)) { | |
1019 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 1020 | } |
a67ba386 | 1021 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_compat_unknown); |
b76dc1a0 MD |
1022 | } |
1023 | ||
3b82c4e1 | 1024 | if (hlist_empty(&chan->compat_sc_exit_unknown)) { |
437d5aa5 | 1025 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 1026 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 1027 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a MD |
1028 | |
1029 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1030 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1031 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1032 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1033 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
1034 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 1035 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1036 | ev.instrumentation); |
a67ba386 MD |
1037 | WARN_ON_ONCE(!event_recorder); |
1038 | if (IS_ERR(event_recorder)) { | |
1039 | return PTR_ERR(event_recorder); | |
5b7ac358 | 1040 | } |
a67ba386 | 1041 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->compat_sc_exit_unknown); |
5b7ac358 MD |
1042 | } |
1043 | ||
3b82c4e1 | 1044 | if (hlist_empty(&chan->sc_exit_unknown)) { |
437d5aa5 | 1045 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 1046 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 1047 | struct lttng_kernel_event_recorder *event_recorder; |
5b7ac358 MD |
1048 | |
1049 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1050 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1051 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1052 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1053 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
1054 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 1055 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1056 | ev.instrumentation); |
a67ba386 MD |
1057 | WARN_ON_ONCE(!event_recorder); |
1058 | if (IS_ERR(event_recorder)) { | |
1059 | return PTR_ERR(event_recorder); | |
2f804c0a | 1060 | } |
a67ba386 | 1061 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_exit_unknown); |
2f804c0a MD |
1062 | } |
1063 | ||
3b82c4e1 | 1064 | ret = lttng_create_syscall_event_if_missing(sc_table, ARRAY_SIZE(sc_table), |
a67ba386 | 1065 | chan->sc_table, event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
1066 | if (ret) |
1067 | return ret; | |
3b82c4e1 | 1068 | ret = lttng_create_syscall_event_if_missing(sc_exit_table, ARRAY_SIZE(sc_exit_table), |
a67ba386 | 1069 | chan->sc_exit_table, event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
1070 | if (ret) |
1071 | return ret; | |
5b7ac358 | 1072 | |
49c50022 | 1073 | #ifdef CONFIG_COMPAT |
3b82c4e1 | 1074 | ret = lttng_create_syscall_event_if_missing(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
a67ba386 | 1075 | chan->compat_sc_table, event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
1076 | if (ret) |
1077 | return ret; | |
3b82c4e1 | 1078 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
a67ba386 | 1079 | chan->compat_sc_exit_table, event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
1080 | if (ret) |
1081 | return ret; | |
1082 | #endif | |
badfe9f5 MD |
1083 | |
1084 | if (!chan->sc_filter) { | |
1085 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1086 | GFP_KERNEL); | |
1087 | if (!chan->sc_filter) | |
1088 | return -ENOMEM; | |
1089 | } | |
1090 | ||
80f87dd2 MD |
1091 | if (!chan->sys_enter_registered) { |
1092 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 1093 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1094 | if (ret) |
1095 | return ret; | |
1096 | chan->sys_enter_registered = 1; | |
1097 | } | |
63728b02 MD |
1098 | /* |
1099 | * We change the name of sys_exit tracepoint due to namespace | |
1100 | * conflict with sys_exit syscall entry. | |
1101 | */ | |
80f87dd2 MD |
1102 | if (!chan->sys_exit_registered) { |
1103 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 1104 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1105 | if (ret) { |
1106 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 1107 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
1108 | return ret; |
1109 | } | |
1110 | chan->sys_exit_registered = 1; | |
63728b02 | 1111 | } |
259b6cb3 MD |
1112 | return ret; |
1113 | } | |
1114 | ||
1115 | /* | |
8a8ac9a8 FD |
1116 | * Should be called with sessions lock held. |
1117 | */ | |
1118 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 1119 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
1120 | { |
1121 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1122 | unsigned int i; | |
1123 | int ret = 0; | |
1124 | ||
1125 | wrapper_vmalloc_sync_mappings(); | |
1126 | ||
1127 | if (!group->event_notifier_syscall_dispatch) { | |
1128 | group->event_notifier_syscall_dispatch = | |
1129 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1130 | GFP_KERNEL); | |
1131 | if (!group->event_notifier_syscall_dispatch) | |
1132 | return -ENOMEM; | |
1133 | ||
1134 | /* Initialize all list_head */ | |
1135 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1136 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); | |
1137 | ||
1138 | /* Init the unknown syscall notifier list. */ | |
1139 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
1140 | } | |
1141 | ||
1142 | if (!group->event_notifier_exit_syscall_dispatch) { | |
1143 | group->event_notifier_exit_syscall_dispatch = | |
1144 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1145 | GFP_KERNEL); | |
1146 | if (!group->event_notifier_exit_syscall_dispatch) | |
1147 | return -ENOMEM; | |
1148 | ||
1149 | /* Initialize all list_head */ | |
1150 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1151 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); | |
1152 | ||
1153 | /* Init the unknown exit syscall notifier list. */ | |
1154 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
1155 | } | |
1156 | ||
1157 | #ifdef CONFIG_COMPAT | |
1158 | if (!group->event_notifier_compat_syscall_dispatch) { | |
1159 | group->event_notifier_compat_syscall_dispatch = | |
1160 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_table), | |
1161 | GFP_KERNEL); | |
1162 | if (!group->event_notifier_syscall_dispatch) | |
1163 | return -ENOMEM; | |
1164 | ||
1165 | /* Initialize all list_head */ | |
1166 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) | |
1167 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); | |
1168 | ||
1169 | /* Init the unknown syscall notifier list. */ | |
1170 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
1171 | } | |
1172 | ||
1173 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
1174 | group->event_notifier_exit_compat_syscall_dispatch = | |
1175 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_exit_table), | |
1176 | GFP_KERNEL); | |
1177 | if (!group->event_notifier_exit_syscall_dispatch) | |
1178 | return -ENOMEM; | |
1179 | ||
1180 | /* Initialize all list_head */ | |
1181 | for (i = 0; i < ARRAY_SIZE(compat_sc_exit_table); i++) | |
1182 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); | |
1183 | ||
1184 | /* Init the unknown exit syscall notifier list. */ | |
1185 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
1186 | } | |
1187 | #endif | |
1188 | ||
1189 | if (!group->sc_filter) { | |
1190 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1191 | GFP_KERNEL); | |
1192 | if (!group->sc_filter) | |
1193 | return -ENOMEM; | |
1194 | } | |
1195 | ||
1196 | if (!group->sys_enter_registered) { | |
1197 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
1198 | (void *) syscall_entry_event_notifier_probe, group); | |
1199 | if (ret) | |
1200 | return ret; | |
1201 | group->sys_enter_registered = 1; | |
1202 | } | |
1203 | ||
1204 | if (!group->sys_exit_registered) { | |
1205 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
1206 | (void *) syscall_exit_event_notifier_probe, group); | |
1207 | if (ret) { | |
1208 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1209 | (void *) syscall_entry_event_notifier_probe, group)); | |
1210 | return ret; | |
1211 | } | |
1212 | group->sys_exit_registered = 1; | |
1213 | } | |
1214 | ||
1215 | return ret; | |
1216 | } | |
1217 | ||
1218 | static | |
1219 | int create_unknown_event_notifier( | |
1220 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1221 | enum sc_type type) | |
1222 | { | |
a67ba386 MD |
1223 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1224 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 1225 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1226 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
606828e4 | 1227 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 | 1228 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1229 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1230 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
1231 | event_notifier_enabler); | |
1232 | struct hlist_head *unknown_dispatch_list; | |
1233 | int ret = 0; | |
1234 | bool found = false; | |
606828e4 MD |
1235 | enum lttng_kernel_abi_syscall_abi abi; |
1236 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
1237 | struct hlist_head *head; |
1238 | ||
1239 | switch (type) { | |
1240 | case SC_TYPE_ENTRY: | |
1241 | desc = &__event_desc___syscall_entry_unknown; | |
1242 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
606828e4 MD |
1243 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1244 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1245 | break; |
1246 | case SC_TYPE_EXIT: | |
1247 | desc = &__event_desc___syscall_exit_unknown; | |
1248 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
606828e4 MD |
1249 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1250 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1251 | break; |
1252 | case SC_TYPE_COMPAT_ENTRY: | |
1253 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1254 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1255 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1256 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1257 | break; |
1258 | case SC_TYPE_COMPAT_EXIT: | |
1259 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1260 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1261 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1262 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1263 | break; |
1264 | default: | |
1265 | BUG_ON(1); | |
1266 | } | |
1267 | ||
1268 | /* | |
1269 | * Check if already created. | |
1270 | */ | |
1271 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1272 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1273 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1274 | if (event_notifier_priv->parent.desc == desc && | |
1275 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
1276 | found = true; |
1277 | } | |
1278 | if (found) | |
1279 | goto end; | |
1280 | ||
1281 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 1282 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 1283 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 1284 | |
606828e4 | 1285 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 1286 | |
606828e4 | 1287 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
1288 | event_notifier_param.event.u.syscall.abi = abi; |
1289 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1290 | ||
a67ba386 MD |
1291 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1292 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 1293 | event_notifier_param.event.instrumentation); |
a67ba386 | 1294 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 1295 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 1296 | desc->event_name); |
8a8ac9a8 FD |
1297 | ret = -ENOMEM; |
1298 | goto end; | |
1299 | } | |
1300 | ||
a67ba386 | 1301 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
1302 | |
1303 | end: | |
1304 | return ret; | |
1305 | } | |
1306 | ||
1307 | static int create_matching_event_notifiers( | |
1308 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 1309 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
1310 | size_t table_len, enum sc_type type) |
1311 | { | |
1312 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 1313 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1314 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1315 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1316 | unsigned int i; |
1317 | int ret = 0; | |
1318 | ||
1319 | /* iterate over all syscall and create event_notifier that match */ | |
1320 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
1321 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1322 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 1323 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
1324 | struct hlist_head *head; |
1325 | int found = 0; | |
1326 | ||
1327 | desc = table[i].desc; | |
1328 | if (!desc) { | |
1329 | /* Unknown syscall */ | |
1330 | continue; | |
1331 | } | |
1332 | ||
1333 | if (!lttng_desc_match_enabler(desc, | |
1334 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1335 | continue; | |
1336 | ||
1337 | /* | |
1338 | * Check if already created. | |
1339 | */ | |
1340 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1341 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1342 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1343 | if (event_notifier_priv->parent.desc == desc | |
1344 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
8a8ac9a8 FD |
1345 | found = 1; |
1346 | } | |
1347 | if (found) | |
1348 | continue; | |
1349 | ||
1350 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1351 | switch (type) { | |
1352 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1353 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1354 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1355 | break; |
1356 | case SC_TYPE_EXIT: | |
606828e4 MD |
1357 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1358 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1359 | break; |
1360 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1361 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1362 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1363 | break; |
1364 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1365 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1366 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1367 | break; |
1368 | } | |
437d5aa5 | 1369 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1370 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1371 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1372 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1373 | |
99f52fcc FD |
1374 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1375 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1376 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1377 | if (IS_ERR(event_notifier)) { |
1378 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1379 | desc->event_name); |
8a8ac9a8 FD |
1380 | ret = -ENOMEM; |
1381 | goto end; | |
1382 | } | |
1383 | ||
a67ba386 | 1384 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1385 | } |
1386 | ||
1387 | end: | |
1388 | return ret; | |
1389 | ||
1390 | } | |
1391 | ||
a67ba386 MD |
1392 | int lttng_syscalls_create_matching_event_notifiers( |
1393 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1394 | { |
1395 | int ret; | |
1396 | struct lttng_enabler *base_enabler = | |
1397 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
606828e4 | 1398 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1399 | base_enabler->event_param.u.syscall.entryexit; |
1400 | ||
606828e4 | 1401 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1402 | ret = create_matching_event_notifiers(event_notifier_enabler, |
a67ba386 | 1403 | sc_table, ARRAY_SIZE(sc_table), SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1404 | if (ret) |
1405 | goto end; | |
1406 | ||
1407 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
a67ba386 | 1408 | compat_sc_table, ARRAY_SIZE(compat_sc_table), |
8a8ac9a8 FD |
1409 | SC_TYPE_COMPAT_ENTRY); |
1410 | if (ret) | |
1411 | goto end; | |
1412 | ||
1413 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1414 | SC_TYPE_ENTRY); | |
1415 | if (ret) | |
1416 | goto end; | |
1417 | ||
1418 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1419 | SC_TYPE_COMPAT_ENTRY); | |
1420 | if (ret) | |
1421 | goto end; | |
1422 | } | |
1423 | ||
606828e4 | 1424 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1425 | ret = create_matching_event_notifiers(event_notifier_enabler, |
a67ba386 | 1426 | sc_exit_table, ARRAY_SIZE(sc_exit_table), |
8a8ac9a8 FD |
1427 | SC_TYPE_EXIT); |
1428 | if (ret) | |
1429 | goto end; | |
1430 | ||
1431 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1432 | SC_TYPE_EXIT); | |
1433 | if (ret) | |
1434 | goto end; | |
1435 | ||
1436 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
a67ba386 | 1437 | compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
8a8ac9a8 FD |
1438 | SC_TYPE_COMPAT_EXIT); |
1439 | if (ret) | |
1440 | goto end; | |
1441 | ||
1442 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1443 | SC_TYPE_COMPAT_EXIT); | |
1444 | if (ret) | |
1445 | goto end; | |
1446 | } | |
1447 | ||
1448 | end: | |
1449 | return ret; | |
1450 | } | |
1451 | ||
1452 | /* | |
1453 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1454 | */ |
3b82c4e1 | 1455 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1456 | struct lttng_event_notifier_group *event_notifier_group) |
1457 | { | |
1458 | int ret; | |
1459 | ||
1460 | /* | |
1461 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1462 | * At the moment, we don't think it's desirable to have one fired | |
1463 | * event_notifier for the entry and one for the exit of a syscall. | |
1464 | */ | |
1465 | if (event_notifier_group->sys_enter_registered) { | |
1466 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1467 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1468 | if (ret) | |
1469 | return ret; | |
1470 | event_notifier_group->sys_enter_registered = 0; | |
1471 | } | |
1472 | if (event_notifier_group->sys_exit_registered) { | |
1473 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1474 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1475 | if (ret) | |
1476 | return ret; | |
1477 | event_notifier_group->sys_enter_registered = 0; | |
1478 | } | |
1479 | ||
1480 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1481 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1482 | #ifdef CONFIG_COMPAT | |
1483 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1484 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1485 | #endif | |
1486 | return 0; | |
1487 | } | |
1488 | ||
3b82c4e1 | 1489 | int lttng_syscalls_unregister_channel(struct lttng_channel *chan) |
259b6cb3 MD |
1490 | { |
1491 | int ret; | |
1492 | ||
1493 | if (!chan->sc_table) | |
1494 | return 0; | |
80f87dd2 | 1495 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1496 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1497 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1498 | if (ret) |
1499 | return ret; | |
1500 | chan->sys_enter_registered = 0; | |
1501 | } | |
1502 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1503 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1504 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1505 | if (ret) |
1506 | return ret; | |
1507 | chan->sys_exit_registered = 0; | |
1508 | } | |
badfe9f5 MD |
1509 | return 0; |
1510 | } | |
1511 | ||
2d6d88c6 | 1512 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 1513 | { |
259b6cb3 | 1514 | kfree(chan->sc_table); |
5b7ac358 | 1515 | kfree(chan->sc_exit_table); |
49c50022 MD |
1516 | #ifdef CONFIG_COMPAT |
1517 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1518 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1519 | #endif |
80f87dd2 MD |
1520 | kfree(chan->sc_filter); |
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | static | |
1525 | int get_syscall_nr(const char *syscall_name) | |
1526 | { | |
1527 | int syscall_nr = -1; | |
1528 | int i; | |
1529 | ||
1530 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
1531 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1532 | const char *it_name; |
80f87dd2 MD |
1533 | |
1534 | entry = &sc_table[i]; | |
1535 | if (!entry->desc) | |
1536 | continue; | |
437d5aa5 | 1537 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1538 | it_name += strlen(SYSCALL_ENTRY_STR); |
1539 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1540 | syscall_nr = i; |
1541 | break; | |
1542 | } | |
1543 | } | |
1544 | return syscall_nr; | |
1545 | } | |
1546 | ||
1547 | static | |
1548 | int get_compat_syscall_nr(const char *syscall_name) | |
1549 | { | |
1550 | int syscall_nr = -1; | |
1551 | int i; | |
1552 | ||
1553 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
1554 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1555 | const char *it_name; |
80f87dd2 MD |
1556 | |
1557 | entry = &compat_sc_table[i]; | |
1558 | if (!entry->desc) | |
1559 | continue; | |
437d5aa5 | 1560 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1561 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1562 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1563 | syscall_nr = i; |
1564 | break; | |
1565 | } | |
1566 | } | |
1567 | return syscall_nr; | |
1568 | } | |
1569 | ||
12e579db MD |
1570 | static |
1571 | uint32_t get_sc_tables_len(void) | |
1572 | { | |
1573 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1574 | } | |
1575 | ||
badfe9f5 | 1576 | static |
ade8a729 FD |
1577 | const char *get_syscall_name(const char *desc_name, |
1578 | enum lttng_syscall_abi abi, | |
1579 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1580 | { |
badfe9f5 | 1581 | size_t prefix_len = 0; |
80f87dd2 | 1582 | |
80f87dd2 | 1583 | |
ade8a729 | 1584 | switch (entryexit) { |
badfe9f5 | 1585 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1586 | switch (abi) { |
badfe9f5 MD |
1587 | case LTTNG_SYSCALL_ABI_NATIVE: |
1588 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1589 | break; | |
1590 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1591 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1592 | break; | |
80f87dd2 | 1593 | } |
badfe9f5 MD |
1594 | break; |
1595 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1596 | switch (abi) { |
badfe9f5 MD |
1597 | case LTTNG_SYSCALL_ABI_NATIVE: |
1598 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1599 | break; | |
1600 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1601 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1602 | break; | |
80f87dd2 | 1603 | } |
badfe9f5 | 1604 | break; |
80f87dd2 | 1605 | } |
badfe9f5 | 1606 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1607 | return desc_name + prefix_len; |
badfe9f5 MD |
1608 | } |
1609 | ||
ade8a729 FD |
1610 | static |
1611 | int lttng_syscall_filter_enable( | |
1612 | struct lttng_syscall_filter *filter, | |
1613 | const char *desc_name, enum lttng_syscall_abi abi, | |
1614 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1615 | { |
badfe9f5 MD |
1616 | const char *syscall_name; |
1617 | unsigned long *bitmap; | |
1618 | int syscall_nr; | |
1619 | ||
ade8a729 | 1620 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1621 | |
ade8a729 | 1622 | switch (abi) { |
badfe9f5 MD |
1623 | case LTTNG_SYSCALL_ABI_NATIVE: |
1624 | syscall_nr = get_syscall_nr(syscall_name); | |
1625 | break; | |
1626 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1627 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1628 | break; | |
1629 | default: | |
1630 | return -EINVAL; | |
80f87dd2 | 1631 | } |
badfe9f5 MD |
1632 | if (syscall_nr < 0) |
1633 | return -ENOENT; | |
1634 | ||
ade8a729 | 1635 | switch (entryexit) { |
badfe9f5 | 1636 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1637 | switch (abi) { |
badfe9f5 MD |
1638 | case LTTNG_SYSCALL_ABI_NATIVE: |
1639 | bitmap = filter->sc_entry; | |
1640 | break; | |
1641 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1642 | bitmap = filter->sc_compat_entry; | |
1643 | break; | |
6d9694d8 MD |
1644 | default: |
1645 | return -EINVAL; | |
80f87dd2 | 1646 | } |
badfe9f5 MD |
1647 | break; |
1648 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1649 | switch (abi) { |
badfe9f5 MD |
1650 | case LTTNG_SYSCALL_ABI_NATIVE: |
1651 | bitmap = filter->sc_exit; | |
1652 | break; | |
1653 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1654 | bitmap = filter->sc_compat_exit; | |
1655 | break; | |
6d9694d8 MD |
1656 | default: |
1657 | return -EINVAL; | |
80f87dd2 | 1658 | } |
badfe9f5 MD |
1659 | break; |
1660 | default: | |
1661 | return -EINVAL; | |
80f87dd2 | 1662 | } |
badfe9f5 MD |
1663 | if (test_bit(syscall_nr, bitmap)) |
1664 | return -EEXIST; | |
1665 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1666 | return 0; |
80f87dd2 MD |
1667 | } |
1668 | ||
8a8ac9a8 | 1669 | int lttng_syscall_filter_enable_event_notifier( |
a67ba386 | 1670 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1671 | { |
a67ba386 MD |
1672 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
1673 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; | |
8a8ac9a8 FD |
1674 | struct hlist_head *dispatch_list; |
1675 | int ret = 0; | |
1676 | ||
a67ba386 | 1677 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
1678 | |
1679 | ret = lttng_syscall_filter_enable(group->sc_filter, | |
a67ba386 MD |
1680 | event_notifier->priv->parent.desc->event_name, |
1681 | event_notifier->priv->parent.u.syscall.abi, | |
1682 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1683 | if (ret) { |
1684 | goto end; | |
1685 | } | |
1686 | ||
a67ba386 | 1687 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 1688 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 1689 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1690 | case LTTNG_SYSCALL_ABI_NATIVE: |
1691 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1692 | break; | |
1693 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1694 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1695 | break; | |
6866b1c7 MJ |
1696 | default: |
1697 | ret = -EINVAL; | |
1698 | goto end; | |
8a8ac9a8 FD |
1699 | } |
1700 | break; | |
1701 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 1702 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1703 | case LTTNG_SYSCALL_ABI_NATIVE: |
1704 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1705 | break; | |
1706 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1707 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1708 | break; | |
6866b1c7 MJ |
1709 | default: |
1710 | ret = -EINVAL; | |
1711 | goto end; | |
8a8ac9a8 FD |
1712 | } |
1713 | break; | |
6866b1c7 MJ |
1714 | default: |
1715 | ret = -EINVAL; | |
1716 | goto end; | |
8a8ac9a8 FD |
1717 | } |
1718 | ||
a67ba386 | 1719 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
1720 | |
1721 | end: | |
1722 | return ret ; | |
1723 | } | |
1724 | ||
ade8a729 FD |
1725 | int lttng_syscall_filter_enable_event( |
1726 | struct lttng_channel *channel, | |
a67ba386 | 1727 | struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 1728 | { |
a67ba386 | 1729 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 FD |
1730 | |
1731 | return lttng_syscall_filter_enable(channel->sc_filter, | |
a67ba386 MD |
1732 | event_recorder->priv->parent.desc->event_name, |
1733 | event_recorder->priv->parent.u.syscall.abi, | |
1734 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1735 | } |
1736 | ||
1737 | static | |
1738 | int lttng_syscall_filter_disable( | |
1739 | struct lttng_syscall_filter *filter, | |
1740 | const char *desc_name, enum lttng_syscall_abi abi, | |
1741 | enum lttng_syscall_entryexit entryexit) | |
1742 | { | |
badfe9f5 MD |
1743 | const char *syscall_name; |
1744 | unsigned long *bitmap; | |
1745 | int syscall_nr; | |
80f87dd2 | 1746 | |
ade8a729 | 1747 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1748 | |
ade8a729 | 1749 | switch (abi) { |
badfe9f5 MD |
1750 | case LTTNG_SYSCALL_ABI_NATIVE: |
1751 | syscall_nr = get_syscall_nr(syscall_name); | |
1752 | break; | |
1753 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1754 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1755 | break; | |
1756 | default: | |
1757 | return -EINVAL; | |
80f87dd2 | 1758 | } |
badfe9f5 MD |
1759 | if (syscall_nr < 0) |
1760 | return -ENOENT; | |
80f87dd2 | 1761 | |
ade8a729 | 1762 | switch (entryexit) { |
badfe9f5 | 1763 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1764 | switch (abi) { |
badfe9f5 MD |
1765 | case LTTNG_SYSCALL_ABI_NATIVE: |
1766 | bitmap = filter->sc_entry; | |
1767 | break; | |
1768 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1769 | bitmap = filter->sc_compat_entry; | |
1770 | break; | |
6d9694d8 MD |
1771 | default: |
1772 | return -EINVAL; | |
80f87dd2 | 1773 | } |
badfe9f5 MD |
1774 | break; |
1775 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1776 | switch (abi) { |
badfe9f5 MD |
1777 | case LTTNG_SYSCALL_ABI_NATIVE: |
1778 | bitmap = filter->sc_exit; | |
1779 | break; | |
1780 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1781 | bitmap = filter->sc_compat_exit; | |
1782 | break; | |
6d9694d8 MD |
1783 | default: |
1784 | return -EINVAL; | |
80f87dd2 | 1785 | } |
badfe9f5 MD |
1786 | break; |
1787 | default: | |
1788 | return -EINVAL; | |
80f87dd2 | 1789 | } |
badfe9f5 MD |
1790 | if (!test_bit(syscall_nr, bitmap)) |
1791 | return -EEXIST; | |
1792 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1793 | |
badfe9f5 | 1794 | return 0; |
259b6cb3 | 1795 | } |
2d2464bd | 1796 | |
8a8ac9a8 | 1797 | int lttng_syscall_filter_disable_event_notifier( |
a67ba386 | 1798 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1799 | { |
a67ba386 | 1800 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
8a8ac9a8 FD |
1801 | int ret; |
1802 | ||
a67ba386 | 1803 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
1804 | |
1805 | ret = lttng_syscall_filter_disable(group->sc_filter, | |
a67ba386 MD |
1806 | event_notifier->priv->parent.desc->event_name, |
1807 | event_notifier->priv->parent.u.syscall.abi, | |
1808 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1809 | WARN_ON_ONCE(ret != 0); |
1810 | ||
a67ba386 | 1811 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
1812 | return 0; |
1813 | } | |
1814 | ||
ade8a729 FD |
1815 | int lttng_syscall_filter_disable_event( |
1816 | struct lttng_channel *channel, | |
a67ba386 | 1817 | struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 FD |
1818 | { |
1819 | return lttng_syscall_filter_disable(channel->sc_filter, | |
a67ba386 MD |
1820 | event_recorder->priv->parent.desc->event_name, |
1821 | event_recorder->priv->parent.u.syscall.abi, | |
1822 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1823 | } |
1824 | ||
2d2464bd MD |
1825 | static |
1826 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1827 | { | |
1828 | const struct trace_syscall_entry *entry; | |
1829 | int iter = 0; | |
1830 | ||
1831 | for (entry = sc_table; | |
1832 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1833 | entry++) { | |
1834 | if (iter++ >= *pos) | |
1835 | return entry; | |
1836 | } | |
1837 | for (entry = compat_sc_table; | |
1838 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1839 | entry++) { | |
1840 | if (iter++ >= *pos) | |
1841 | return entry; | |
1842 | } | |
1843 | /* End of list */ | |
1844 | return NULL; | |
1845 | } | |
1846 | ||
1847 | static | |
1848 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1849 | { | |
1850 | return (void *) syscall_list_get_entry(pos); | |
1851 | } | |
1852 | ||
1853 | static | |
1854 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1855 | { | |
1856 | (*ppos)++; | |
1857 | return (void *) syscall_list_get_entry(ppos); | |
1858 | } | |
1859 | ||
1860 | static | |
1861 | void syscall_list_stop(struct seq_file *m, void *p) | |
1862 | { | |
1863 | } | |
1864 | ||
12e579db MD |
1865 | static |
1866 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1867 | const struct trace_syscall_entry **table, | |
1868 | unsigned int *bitness) | |
1869 | { | |
1870 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1871 | if (bitness) | |
1872 | *bitness = BITS_PER_LONG; | |
1873 | if (table) | |
1874 | *table = sc_table; | |
1875 | return 0; | |
1876 | } | |
1877 | if (!(entry >= compat_sc_table | |
1878 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1879 | return -EINVAL; | |
1880 | } | |
1881 | if (bitness) | |
1882 | *bitness = 32; | |
1883 | if (table) | |
1884 | *table = compat_sc_table; | |
1885 | return 0; | |
1886 | } | |
1887 | ||
2d2464bd MD |
1888 | static |
1889 | int syscall_list_show(struct seq_file *m, void *p) | |
1890 | { | |
1891 | const struct trace_syscall_entry *table, *entry = p; | |
1892 | unsigned int bitness; | |
d4291869 | 1893 | unsigned long index; |
12e579db | 1894 | int ret; |
d4291869 | 1895 | const char *name; |
2d2464bd | 1896 | |
12e579db MD |
1897 | ret = get_sc_table(entry, &table, &bitness); |
1898 | if (ret) | |
1899 | return ret; | |
f4855b46 MD |
1900 | if (!entry->desc) |
1901 | return 0; | |
d4291869 MD |
1902 | if (table == sc_table) { |
1903 | index = entry - table; | |
437d5aa5 | 1904 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 MD |
1905 | } else { |
1906 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
437d5aa5 | 1907 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1908 | } |
12e579db | 1909 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1910 | index, name, bitness); |
2d2464bd MD |
1911 | return 0; |
1912 | } | |
1913 | ||
1914 | static | |
1915 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1916 | .start = syscall_list_start, | |
1917 | .next = syscall_list_next, | |
1918 | .stop = syscall_list_stop, | |
1919 | .show = syscall_list_show, | |
1920 | }; | |
1921 | ||
1922 | static | |
1923 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1924 | { | |
1925 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1926 | } | |
1927 | ||
1928 | const struct file_operations lttng_syscall_list_fops = { | |
1929 | .owner = THIS_MODULE, | |
1930 | .open = lttng_syscall_list_open, | |
1931 | .read = seq_read, | |
1932 | .llseek = seq_lseek, | |
1933 | .release = seq_release, | |
1934 | }; | |
12e579db | 1935 | |
badfe9f5 MD |
1936 | /* |
1937 | * A syscall is enabled if it is traced for either entry or exit. | |
1938 | */ | |
12e579db | 1939 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
606828e4 | 1940 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1941 | { |
1942 | uint32_t len, sc_tables_len, bitmask_len; | |
1943 | int ret = 0, bit; | |
1944 | char *tmp_mask; | |
1945 | struct lttng_syscall_filter *filter; | |
1946 | ||
1947 | ret = get_user(len, &usyscall_mask->len); | |
1948 | if (ret) | |
1949 | return ret; | |
1950 | sc_tables_len = get_sc_tables_len(); | |
1951 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1952 | if (len < sc_tables_len) { | |
1953 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1954 | } | |
1955 | /* Array is large enough, we can copy array to user-space. */ | |
1956 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1957 | if (!tmp_mask) | |
1958 | return -ENOMEM; | |
1959 | filter = channel->sc_filter; | |
1960 | ||
1961 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1962 | char state; |
2f25059d MD |
1963 | |
1964 | if (channel->sc_table) { | |
3b82c4e1 MD |
1965 | if (!(READ_ONCE(channel->syscall_all_entry) |
1966 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1967 | state = test_bit(bit, filter->sc_entry) |
1968 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1969 | else |
1970 | state = 1; | |
1971 | } else { | |
1972 | state = 0; | |
1973 | } | |
1974 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1975 | } |
1976 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1977 | char state; |
2f25059d MD |
1978 | |
1979 | if (channel->compat_sc_table) { | |
3b82c4e1 MD |
1980 | if (!(READ_ONCE(channel->syscall_all_entry) |
1981 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
2f25059d | 1982 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
badfe9f5 MD |
1983 | filter->sc_compat_entry) |
1984 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
1985 | filter->sc_compat_exit); | |
2f25059d MD |
1986 | else |
1987 | state = 1; | |
1988 | } else { | |
1989 | state = 0; | |
1990 | } | |
1991 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1992 | } |
1993 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1994 | ret = -EFAULT; | |
1995 | kfree(tmp_mask); | |
1996 | return ret; | |
1997 | } | |
082d4946 MD |
1998 | |
1999 | int lttng_abi_syscall_list(void) | |
2000 | { | |
2001 | struct file *syscall_list_file; | |
2002 | int file_fd, ret; | |
2003 | ||
4ac10b76 | 2004 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
2005 | if (file_fd < 0) { |
2006 | ret = file_fd; | |
2007 | goto fd_error; | |
2008 | } | |
2009 | ||
2010 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
2011 | <tng_syscall_list_fops, | |
2012 | NULL, O_RDWR); | |
2013 | if (IS_ERR(syscall_list_file)) { | |
2014 | ret = PTR_ERR(syscall_list_file); | |
2015 | goto file_error; | |
2016 | } | |
2017 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
2018 | if (ret < 0) | |
2019 | goto open_error; | |
2020 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
2021 | return file_fd; |
2022 | ||
2023 | open_error: | |
2024 | fput(syscall_list_file); | |
2025 | file_error: | |
2026 | put_unused_fd(file_fd); | |
2027 | fd_error: | |
2028 | return ret; | |
2029 | } |