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> |
6f156b09 | 32 | #include <lttng/events-internal.h> |
8a8ac9a8 | 33 | #include <lttng/utils.h> |
259b6cb3 | 34 | |
ebcc64cd FD |
35 | #include "lttng-syscalls.h" |
36 | ||
6333ace3 | 37 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
38 | # ifndef is_compat_task |
39 | # define is_compat_task() (0) | |
40 | # endif | |
6333ace3 MD |
41 | #endif |
42 | ||
1aa3298b MD |
43 | /* in_compat_syscall appears in kernel 4.6. */ |
44 | #ifndef in_compat_syscall | |
45 | #define in_compat_syscall() is_compat_task() | |
46 | #endif | |
47 | ||
5b7ac358 MD |
48 | enum sc_type { |
49 | SC_TYPE_ENTRY, | |
50 | SC_TYPE_EXIT, | |
51 | SC_TYPE_COMPAT_ENTRY, | |
52 | SC_TYPE_COMPAT_EXIT, | |
53 | }; | |
54 | ||
d4291869 MD |
55 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
56 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
57 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
58 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
59 | ||
60 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
61 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
62 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
63 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 64 | |
a93244f8 | 65 | static |
2d6d88c6 | 66 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 | 67 | static |
2d6d88c6 | 68 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 69 | |
8a8ac9a8 FD |
70 | static |
71 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, | |
72 | long id); | |
73 | static | |
74 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
75 | long ret); | |
76 | ||
3a523f5b MD |
77 | /* |
78 | * Forward declarations for old kernels. | |
79 | */ | |
80 | struct mmsghdr; | |
81 | struct rlimit64; | |
82 | struct oldold_utsname; | |
83 | struct old_utsname; | |
84 | struct sel_arg_struct; | |
85 | struct mmap_arg_struct; | |
c0b71117 | 86 | struct file_handle; |
a292e6f1 | 87 | struct user_msghdr; |
3a523f5b | 88 | |
9eb15e8b MJ |
89 | /* |
90 | * Forward declaration for kernels >= 5.6 | |
91 | */ | |
92 | struct timex; | |
edfdcb68 MJ |
93 | struct timeval; |
94 | struct itimerval; | |
95 | struct itimerspec; | |
96 | ||
5f4c791e | 97 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
98 | typedef __kernel_old_time_t time_t; |
99 | #endif | |
9eb15e8b | 100 | |
80f87dd2 MD |
101 | #ifdef IA32_NR_syscalls |
102 | #define NR_compat_syscalls IA32_NR_syscalls | |
103 | #else | |
104 | #define NR_compat_syscalls NR_syscalls | |
105 | #endif | |
106 | ||
259b6cb3 MD |
107 | /* |
108 | * Create LTTng tracepoint probes. | |
109 | */ | |
110 | #define LTTNG_PACKAGE_BUILD | |
111 | #define CREATE_TRACE_POINTS | |
2655f9ad | 112 | #define TP_MODULE_NOINIT |
c075712b | 113 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 114 | |
a93244f8 MD |
115 | #define PARAMS(args...) args |
116 | ||
5b7ac358 | 117 | /* Handle unknown syscalls */ |
72a52753 | 118 | #undef TRACE_SYSTEM |
5b7ac358 | 119 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 120 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
121 | #undef TRACE_SYSTEM |
122 | ||
fc4f7161 MD |
123 | #define SC_ENTER |
124 | ||
fc4f7161 MD |
125 | #undef sc_exit |
126 | #define sc_exit(...) | |
b75d00c4 MD |
127 | #undef sc_in |
128 | #define sc_in(...) __VA_ARGS__ | |
129 | #undef sc_out | |
130 | #define sc_out(...) | |
131 | #undef sc_inout | |
132 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
133 | |
134 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 135 | #undef TP_PROBE_CB |
2d6d88c6 | 136 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
57ede728 | 137 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 138 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 139 | PARAMS(_fields)) |
265822ae | 140 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 141 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
142 | PARAMS(_locvar), PARAMS(_code_pre), \ |
143 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
144 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
145 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 146 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 147 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
148 | /* Enumerations only defined at first inclusion. */ |
149 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
150 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 151 | #undef TRACE_SYSTEM |
d4291869 | 152 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 153 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 154 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 155 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 156 | #undef TRACE_SYSTEM |
d4291869 | 157 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 158 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 159 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 160 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 161 | #undef TRACE_SYSTEM |
141ddf28 | 162 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
163 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
164 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
165 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
166 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 167 | #undef TP_PROBE_CB |
3bc29f0a MD |
168 | #undef _TRACE_SYSCALLS_INTEGERS_H |
169 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
170 | |
171 | /* Hijack probe callback for compat system call enter */ | |
2d6d88c6 | 172 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
771af27e | 173 | #define LTTNG_SC_COMPAT |
57ede728 | 174 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 175 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 176 | PARAMS(_fields)) |
265822ae | 177 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 178 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 179 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
180 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
181 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 182 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
183 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
184 | compat_syscall_entry_##_name) | |
141ddf28 MD |
185 | /* Enumerations only defined at inital inclusion (not here). */ |
186 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 187 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 188 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 189 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
190 | #undef TRACE_INCLUDE_FILE |
191 | #undef TRACE_SYSTEM | |
d4291869 | 192 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 193 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 194 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
195 | #undef TRACE_INCLUDE_FILE |
196 | #undef TRACE_SYSTEM | |
141ddf28 | 197 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
198 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
199 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
200 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
201 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 202 | #undef TP_PROBE_CB |
3bc29f0a MD |
203 | #undef _TRACE_SYSCALLS_INTEGERS_H |
204 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 205 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 206 | |
fc4f7161 MD |
207 | #undef SC_ENTER |
208 | ||
209 | #define SC_EXIT | |
210 | ||
fc4f7161 MD |
211 | #undef sc_exit |
212 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
213 | #undef sc_in |
214 | #define sc_in(...) | |
215 | #undef sc_out | |
216 | #define sc_out(...) __VA_ARGS__ | |
217 | #undef sc_inout | |
218 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
219 | |
220 | /* Hijack probe callback for system call exit */ | |
2d6d88c6 | 221 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
57ede728 | 222 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 223 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 224 | PARAMS(_fields)) |
265822ae | 225 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 226 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 227 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
228 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
229 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
230 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
231 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 232 | syscall_exit_##_name) |
141ddf28 MD |
233 | /* Enumerations only defined at inital inclusion (not here). */ |
234 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
235 | #define TRACE_SYSTEM syscall_exit_integers |
236 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 237 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
238 | #undef TRACE_INCLUDE_FILE |
239 | #undef TRACE_SYSTEM | |
240 | #define TRACE_SYSTEM syscall_exit_pointers | |
241 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 242 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
243 | #undef TRACE_INCLUDE_FILE |
244 | #undef TRACE_SYSTEM | |
141ddf28 | 245 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
246 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
247 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
248 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
249 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 250 | #undef TP_PROBE_CB |
3bc29f0a MD |
251 | #undef _TRACE_SYSCALLS_INTEGERS_H |
252 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
253 | |
254 | ||
255 | /* Hijack probe callback for compat system call exit */ | |
2d6d88c6 | 256 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
771af27e | 257 | #define LTTNG_SC_COMPAT |
57ede728 | 258 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 259 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 260 | PARAMS(_fields)) |
265822ae | 261 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 262 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 263 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
264 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
265 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 266 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 267 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 268 | compat_syscall_exit_##_name) |
141ddf28 MD |
269 | /* Enumerations only defined at inital inclusion (not here). */ |
270 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
271 | #define TRACE_SYSTEM compat_syscall_exit_integers |
272 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 273 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 274 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 275 | #undef TRACE_SYSTEM |
5b7ac358 MD |
276 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
277 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 278 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 279 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 280 | #undef TRACE_SYSTEM |
141ddf28 | 281 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
282 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
283 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
284 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
285 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 286 | #undef TP_PROBE_CB |
3bc29f0a MD |
287 | #undef _TRACE_SYSCALLS_INTEGERS_H |
288 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 289 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 290 | |
fc4f7161 | 291 | #undef SC_EXIT |
259b6cb3 | 292 | |
2655f9ad | 293 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
294 | #undef LTTNG_PACKAGE_BUILD |
295 | #undef CREATE_TRACE_POINTS | |
296 | ||
a93244f8 MD |
297 | #define CREATE_SYSCALL_TABLE |
298 | ||
fc4f7161 MD |
299 | #define SC_ENTER |
300 | ||
301 | #undef sc_exit | |
302 | #define sc_exit(...) | |
303 | ||
259b6cb3 | 304 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 305 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 306 | [ _nr ] = { \ |
2d6d88c6 | 307 | .event_func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 308 | .nrargs = (_nrargs), \ |
d4291869 MD |
309 | .fields = __event_fields___syscall_entry_##_template, \ |
310 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
311 | }, |
312 | ||
2d6d88c6 | 313 | /* Event syscall enter tracing table */ |
ebcc64cd | 314 | static const struct trace_syscall_entry _sc_table[] = { |
241ae9a8 MD |
315 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
316 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
317 | }; |
318 | ||
ebcc64cd FD |
319 | |
320 | const struct trace_syscall_table sc_table = { | |
321 | .table = _sc_table, | |
322 | .len = ARRAY_SIZE(_sc_table), | |
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, \ |
a93244f8 | 329 | .nrargs = (_nrargs), \ |
d4291869 MD |
330 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
331 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
332 | }, |
333 | ||
2d6d88c6 | 334 | /* Event compat syscall enter table */ |
ebcc64cd | 335 | const struct trace_syscall_entry _compat_sc_table[] = { |
241ae9a8 MD |
336 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
337 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 338 | }; |
259b6cb3 | 339 | |
ebcc64cd FD |
340 | const struct trace_syscall_table compat_sc_table = { |
341 | .table = _compat_sc_table, | |
342 | .len = ARRAY_SIZE(_compat_sc_table), | |
343 | }; | |
344 | ||
fc4f7161 MD |
345 | #undef SC_ENTER |
346 | ||
347 | #define SC_EXIT | |
348 | ||
349 | #undef sc_exit | |
350 | #define sc_exit(...) __VA_ARGS__ | |
351 | ||
5b7ac358 MD |
352 | #undef TRACE_SYSCALL_TABLE |
353 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
354 | [ _nr ] = { \ | |
2d6d88c6 | 355 | .event_func = __event_probe__syscall_exit_##_template, \ |
5b7ac358 MD |
356 | .nrargs = (_nrargs), \ |
357 | .fields = __event_fields___syscall_exit_##_template, \ | |
358 | .desc = &__event_desc___syscall_exit_##_name, \ | |
359 | }, | |
360 | ||
2d6d88c6 | 361 | /* Event syscall exit table */ |
ebcc64cd | 362 | static const struct trace_syscall_entry _sc_exit_table[] = { |
241ae9a8 MD |
363 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
364 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
365 | }; |
366 | ||
ebcc64cd FD |
367 | const struct trace_syscall_table sc_exit_table = { |
368 | .table = _sc_exit_table, | |
369 | .len = ARRAY_SIZE(_sc_exit_table), | |
370 | }; | |
371 | ||
372 | ||
5b7ac358 MD |
373 | #undef TRACE_SYSCALL_TABLE |
374 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
375 | [ _nr ] = { \ | |
2d6d88c6 | 376 | .event_func = __event_probe__compat_syscall_exit_##_template, \ |
5b7ac358 MD |
377 | .nrargs = (_nrargs), \ |
378 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
379 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
380 | }, | |
381 | ||
2d6d88c6 | 382 | /* Event compat syscall exit table */ |
ebcc64cd | 383 | const struct trace_syscall_entry _compat_sc_exit_table[] = { |
241ae9a8 MD |
384 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
385 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
386 | }; |
387 | ||
ebcc64cd FD |
388 | const struct trace_syscall_table compat_sc_exit_table = { |
389 | .table = _compat_sc_exit_table, | |
390 | .len = ARRAY_SIZE(_compat_sc_exit_table), | |
391 | }; | |
392 | ||
fc4f7161 MD |
393 | #undef SC_EXIT |
394 | ||
a93244f8 | 395 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 396 | |
80f87dd2 | 397 | struct lttng_syscall_filter { |
badfe9f5 MD |
398 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
399 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
400 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
401 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
402 | }; |
403 | ||
3b82c4e1 | 404 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 405 | struct pt_regs *regs, long id) |
f405cfce | 406 | { |
1b7b9c65 | 407 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 408 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 409 | |
1b7b9c65 | 410 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 411 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 412 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 413 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 414 | else |
e2d5dbc7 | 415 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
416 | } |
417 | } | |
418 | ||
63aa9160 | 419 | static __always_inline |
e2d5dbc7 | 420 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 421 | void *func, unsigned int nrargs, |
63aa9160 | 422 | struct pt_regs *regs) |
259b6cb3 | 423 | { |
a67ba386 | 424 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 425 | |
63aa9160 | 426 | switch (nrargs) { |
259b6cb3 MD |
427 | case 0: |
428 | { | |
63aa9160 | 429 | void (*fptr)(void *__data) = func; |
259b6cb3 | 430 | |
e2d5dbc7 MD |
431 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
432 | fptr(event_priv->pub); | |
259b6cb3 MD |
433 | break; |
434 | } | |
435 | case 1: | |
436 | { | |
63aa9160 | 437 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 438 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 439 | |
1b7b9c65 | 440 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
441 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
442 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
443 | break; |
444 | } | |
445 | case 2: | |
446 | { | |
447 | void (*fptr)(void *__data, | |
448 | unsigned long arg0, | |
63aa9160 | 449 | unsigned long arg1) = func; |
1b7b9c65 | 450 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 451 | |
1b7b9c65 | 452 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
453 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
454 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
455 | break; |
456 | } | |
457 | case 3: | |
458 | { | |
459 | void (*fptr)(void *__data, | |
460 | unsigned long arg0, | |
461 | unsigned long arg1, | |
63aa9160 | 462 | unsigned long arg2) = func; |
1b7b9c65 | 463 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 464 | |
1b7b9c65 | 465 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
466 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
467 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
468 | break; |
469 | } | |
470 | case 4: | |
471 | { | |
472 | void (*fptr)(void *__data, | |
473 | unsigned long arg0, | |
474 | unsigned long arg1, | |
475 | unsigned long arg2, | |
63aa9160 | 476 | unsigned long arg3) = func; |
1b7b9c65 | 477 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 478 | |
1b7b9c65 | 479 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
480 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
481 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
482 | break; |
483 | } | |
484 | case 5: | |
485 | { | |
486 | void (*fptr)(void *__data, | |
487 | unsigned long arg0, | |
488 | unsigned long arg1, | |
489 | unsigned long arg2, | |
490 | unsigned long arg3, | |
63aa9160 | 491 | unsigned long arg4) = func; |
1b7b9c65 | 492 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 493 | |
1b7b9c65 | 494 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
495 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
496 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
497 | break; |
498 | } | |
499 | case 6: | |
500 | { | |
501 | void (*fptr)(void *__data, | |
502 | unsigned long arg0, | |
503 | unsigned long arg1, | |
504 | unsigned long arg2, | |
505 | unsigned long arg3, | |
506 | unsigned long arg4, | |
63aa9160 | 507 | unsigned long arg5) = func; |
1b7b9c65 | 508 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 509 | |
1b7b9c65 | 510 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
511 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
512 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 513 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
514 | break; |
515 | } | |
516 | default: | |
517 | break; | |
518 | } | |
519 | } | |
520 | ||
63aa9160 FD |
521 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
522 | { | |
523 | struct lttng_channel *chan = __data; | |
3b82c4e1 | 524 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
525 | const struct trace_syscall_entry *table, *entry; |
526 | size_t table_len; | |
527 | ||
528 | if (unlikely(in_compat_syscall())) { | |
529 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
530 | ||
531 | if (id < 0 || id >= NR_compat_syscalls | |
3b82c4e1 | 532 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
533 | /* System call filtered out. */ |
534 | return; | |
535 | } | |
ebcc64cd FD |
536 | table = compat_sc_table.table; |
537 | table_len = compat_sc_table.len; | |
3b82c4e1 | 538 | unknown_action_list = &chan->sc_compat_unknown; |
63aa9160 FD |
539 | } else { |
540 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
541 | ||
542 | if (id < 0 || id >= NR_syscalls | |
3b82c4e1 | 543 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
544 | /* System call filtered out. */ |
545 | return; | |
546 | } | |
ebcc64cd FD |
547 | table = sc_table.table; |
548 | table_len = sc_table.len; | |
3b82c4e1 | 549 | unknown_action_list = &chan->sc_unknown; |
63aa9160 FD |
550 | } |
551 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 552 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
553 | return; |
554 | } | |
3b82c4e1 MD |
555 | |
556 | entry = &table[id]; | |
557 | if (!entry->event_func) { | |
558 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
559 | return; |
560 | } | |
3b82c4e1 MD |
561 | |
562 | if (unlikely(in_compat_syscall())) { | |
563 | action_list = &chan->compat_sc_table[id]; | |
564 | } else { | |
565 | action_list = &chan->sc_table[id]; | |
566 | } | |
567 | if (unlikely(hlist_empty(action_list))) | |
568 | return; | |
569 | ||
e2d5dbc7 | 570 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
571 | } |
572 | ||
8a8ac9a8 FD |
573 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
574 | long id) | |
575 | { | |
576 | struct lttng_event_notifier_group *group = __data; | |
577 | const struct trace_syscall_entry *table, *entry; | |
578 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
579 | size_t table_len; | |
580 | ||
581 | if (unlikely(in_compat_syscall())) { | |
582 | struct lttng_syscall_filter *filter = group->sc_filter; | |
583 | ||
584 | if (id < 0 || id >= NR_compat_syscalls | |
585 | || (!READ_ONCE(group->syscall_all_entry) && | |
586 | !test_bit(id, filter->sc_compat_entry))) { | |
587 | /* System call filtered out. */ | |
588 | return; | |
589 | } | |
ebcc64cd FD |
590 | table = compat_sc_table.table; |
591 | table_len = compat_sc_table.len; | |
8a8ac9a8 FD |
592 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; |
593 | } else { | |
594 | struct lttng_syscall_filter *filter = group->sc_filter; | |
595 | ||
596 | if (id < 0 || id >= NR_syscalls | |
597 | || (!READ_ONCE(group->syscall_all_entry) && | |
598 | !test_bit(id, filter->sc_entry))) { | |
599 | /* System call filtered out. */ | |
600 | return; | |
601 | } | |
ebcc64cd FD |
602 | table = sc_table.table; |
603 | table_len = sc_table.len; | |
8a8ac9a8 FD |
604 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; |
605 | } | |
606 | /* Check if the syscall id is out of bound. */ | |
607 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 608 | syscall_entry_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
609 | regs, id); |
610 | return; | |
611 | } | |
612 | ||
613 | entry = &table[id]; | |
e2d5dbc7 MD |
614 | if (!entry->event_func) { |
615 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
616 | regs, id); |
617 | return; | |
618 | } | |
619 | ||
620 | if (unlikely(in_compat_syscall())) { | |
621 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
622 | } else { | |
623 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
624 | } | |
625 | if (unlikely(hlist_empty(dispatch_list))) | |
626 | return; | |
627 | ||
e2d5dbc7 MD |
628 | syscall_entry_event_call_func(dispatch_list, |
629 | entry->event_func, entry->nrargs, regs); | |
8a8ac9a8 FD |
630 | } |
631 | ||
3b82c4e1 | 632 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 633 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 634 | { |
1b7b9c65 | 635 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 636 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 637 | |
1b7b9c65 | 638 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 639 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 640 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 641 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
642 | args); |
643 | else | |
e2d5dbc7 | 644 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 645 | } |
5b7ac358 MD |
646 | } |
647 | ||
3b82c4e1 | 648 | static __always_inline |
e2d5dbc7 | 649 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
650 | void *func, unsigned int nrargs, |
651 | struct pt_regs *regs, long ret) | |
5b7ac358 | 652 | { |
a67ba386 | 653 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 654 | |
3b82c4e1 | 655 | switch (nrargs) { |
5b7ac358 MD |
656 | case 0: |
657 | { | |
3b82c4e1 | 658 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 659 | |
e2d5dbc7 MD |
660 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
661 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
662 | break; |
663 | } | |
664 | case 1: | |
665 | { | |
666 | void (*fptr)(void *__data, | |
fc4f7161 | 667 | long ret, |
3b82c4e1 | 668 | unsigned long arg0) = func; |
1b7b9c65 | 669 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 670 | |
1b7b9c65 | 671 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
672 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
673 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
674 | break; |
675 | } | |
676 | case 2: | |
677 | { | |
678 | void (*fptr)(void *__data, | |
fc4f7161 | 679 | long ret, |
5b7ac358 | 680 | unsigned long arg0, |
3b82c4e1 | 681 | unsigned long arg1) = func; |
1b7b9c65 | 682 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 683 | |
1b7b9c65 | 684 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
685 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
686 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
687 | break; |
688 | } | |
689 | case 3: | |
690 | { | |
691 | void (*fptr)(void *__data, | |
fc4f7161 | 692 | long ret, |
5b7ac358 MD |
693 | unsigned long arg0, |
694 | unsigned long arg1, | |
3b82c4e1 | 695 | unsigned long arg2) = func; |
1b7b9c65 | 696 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 697 | |
1b7b9c65 | 698 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
699 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
700 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
701 | break; |
702 | } | |
703 | case 4: | |
704 | { | |
705 | void (*fptr)(void *__data, | |
fc4f7161 | 706 | long ret, |
5b7ac358 MD |
707 | unsigned long arg0, |
708 | unsigned long arg1, | |
709 | unsigned long arg2, | |
3b82c4e1 | 710 | unsigned long arg3) = func; |
1b7b9c65 | 711 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 712 | |
1b7b9c65 | 713 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
714 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
715 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
716 | break; |
717 | } | |
718 | case 5: | |
719 | { | |
720 | void (*fptr)(void *__data, | |
fc4f7161 | 721 | long ret, |
5b7ac358 MD |
722 | unsigned long arg0, |
723 | unsigned long arg1, | |
724 | unsigned long arg2, | |
725 | unsigned long arg3, | |
3b82c4e1 | 726 | unsigned long arg4) = 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], args[3], args[4]); | |
5b7ac358 MD |
732 | break; |
733 | } | |
734 | case 6: | |
735 | { | |
736 | void (*fptr)(void *__data, | |
fc4f7161 | 737 | long ret, |
5b7ac358 MD |
738 | unsigned long arg0, |
739 | unsigned long arg1, | |
740 | unsigned long arg2, | |
741 | unsigned long arg3, | |
742 | unsigned long arg4, | |
3b82c4e1 | 743 | unsigned long arg5) = func; |
1b7b9c65 | 744 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 745 | |
1b7b9c65 | 746 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
747 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
748 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 749 | args[3], args[4], args[5]); |
5b7ac358 MD |
750 | break; |
751 | } | |
752 | default: | |
753 | break; | |
754 | } | |
755 | } | |
756 | ||
3b82c4e1 MD |
757 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
758 | { | |
759 | struct lttng_channel *chan = __data; | |
760 | struct hlist_head *action_list, *unknown_action_list; | |
761 | const struct trace_syscall_entry *table, *entry; | |
762 | size_t table_len; | |
763 | long id; | |
764 | ||
765 | id = syscall_get_nr(current, regs); | |
766 | ||
767 | if (unlikely(in_compat_syscall())) { | |
768 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
769 | ||
770 | if (id < 0 || id >= NR_compat_syscalls | |
771 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { | |
772 | /* System call filtered out. */ | |
773 | return; | |
774 | } | |
ebcc64cd FD |
775 | table = compat_sc_exit_table.table; |
776 | table_len = compat_sc_exit_table.len; | |
3b82c4e1 MD |
777 | unknown_action_list = &chan->compat_sc_exit_unknown; |
778 | } else { | |
779 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
780 | ||
781 | if (id < 0 || id >= NR_syscalls | |
782 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { | |
783 | /* System call filtered out. */ | |
784 | return; | |
785 | } | |
ebcc64cd FD |
786 | table = sc_exit_table.table; |
787 | table_len = sc_exit_table.len; | |
3b82c4e1 MD |
788 | unknown_action_list = &chan->sc_exit_unknown; |
789 | } | |
790 | if (unlikely(id < 0 || id >= table_len)) { | |
791 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
792 | return; | |
793 | } | |
794 | ||
795 | entry = &table[id]; | |
796 | if (!entry->event_func) { | |
797 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
798 | return; | |
799 | } | |
800 | ||
801 | if (unlikely(in_compat_syscall())) { | |
802 | action_list = &chan->compat_sc_exit_table[id]; | |
803 | } else { | |
804 | action_list = &chan->sc_exit_table[id]; | |
805 | } | |
806 | if (unlikely(hlist_empty(action_list))) | |
807 | return; | |
808 | ||
e2d5dbc7 | 809 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
810 | regs, ret); |
811 | } | |
812 | ||
8a8ac9a8 FD |
813 | static |
814 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
815 | long ret) | |
816 | { | |
817 | struct lttng_event_notifier_group *group = __data; | |
818 | const struct trace_syscall_entry *table, *entry; | |
819 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
820 | size_t table_len; | |
821 | long id; | |
822 | ||
823 | id = syscall_get_nr(current, regs); | |
824 | ||
825 | if (unlikely(in_compat_syscall())) { | |
826 | struct lttng_syscall_filter *filter = group->sc_filter; | |
827 | ||
828 | if (id < 0 || id >= NR_compat_syscalls | |
829 | || (!READ_ONCE(group->syscall_all_exit) && | |
830 | !test_bit(id, filter->sc_compat_exit))) { | |
831 | /* System call filtered out. */ | |
832 | return; | |
833 | } | |
ebcc64cd FD |
834 | table = compat_sc_exit_table.table; |
835 | table_len = compat_sc_exit_table.len; | |
8a8ac9a8 FD |
836 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; |
837 | } else { | |
838 | struct lttng_syscall_filter *filter = group->sc_filter; | |
839 | ||
840 | if (id < 0 || id >= NR_syscalls | |
841 | || (!READ_ONCE(group->syscall_all_exit) && | |
842 | !test_bit(id, filter->sc_exit))) { | |
843 | /* System call filtered out. */ | |
844 | return; | |
845 | } | |
ebcc64cd FD |
846 | table = sc_exit_table.table; |
847 | table_len = sc_exit_table.len; | |
8a8ac9a8 FD |
848 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; |
849 | } | |
850 | /* Check if the syscall id is out of bound. */ | |
851 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 852 | syscall_exit_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
853 | regs, id, ret); |
854 | return; | |
855 | } | |
856 | ||
857 | entry = &table[id]; | |
e2d5dbc7 MD |
858 | if (!entry->event_func) { |
859 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
860 | regs, id); |
861 | return; | |
862 | } | |
863 | ||
864 | if (unlikely(in_compat_syscall())) { | |
865 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
866 | } else { | |
867 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
868 | } | |
869 | if (unlikely(hlist_empty(dispatch_list))) | |
870 | return; | |
871 | ||
e2d5dbc7 MD |
872 | syscall_exit_event_call_func(dispatch_list, |
873 | entry->event_func, entry->nrargs, regs, ret); | |
8a8ac9a8 | 874 | } |
33a39a3c MD |
875 | /* |
876 | * noinline to diminish caller stack size. | |
877 | * Should be called with sessions lock held. | |
878 | */ | |
49c50022 | 879 | static |
3b82c4e1 MD |
880 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
881 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
a67ba386 | 882 | enum sc_type type) |
259b6cb3 | 883 | { |
3b82c4e1 | 884 | struct lttng_channel *chan = event_enabler->chan; |
8cdc1a81 | 885 | struct lttng_kernel_session *session = chan->session; |
259b6cb3 | 886 | unsigned int i; |
49c50022 | 887 | |
3b82c4e1 | 888 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 889 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 890 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
606828e4 | 891 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
892 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
893 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
894 | struct hlist_head *head; |
895 | bool found = false; | |
49c50022 MD |
896 | |
897 | if (!desc) { | |
898 | /* Unknown syscall */ | |
899 | continue; | |
900 | } | |
3b82c4e1 MD |
901 | if (lttng_desc_match_enabler(desc, |
902 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
903 | continue; | |
49c50022 | 904 | /* |
3b82c4e1 | 905 | * Check if already created. |
49c50022 | 906 | */ |
3b82c4e1 | 907 | head = utils_borrow_hash_table_bucket( |
8cdc1a81 | 908 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 909 | desc->event_name); |
a67ba386 MD |
910 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
911 | if (event_recorder_priv->parent.desc == desc | |
912 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3b82c4e1 MD |
913 | found = true; |
914 | } | |
915 | if (found) | |
49c50022 | 916 | continue; |
3b82c4e1 MD |
917 | |
918 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 919 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
920 | switch (type) { |
921 | case SC_TYPE_ENTRY: | |
606828e4 MD |
922 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
923 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
924 | break; |
925 | case SC_TYPE_EXIT: | |
606828e4 MD |
926 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
927 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
928 | break; |
929 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
930 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
931 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
932 | break; |
933 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
934 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
935 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
936 | break; |
937 | } | |
606828e4 MD |
938 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
939 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
940 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
a67ba386 MD |
941 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, ev.instrumentation); |
942 | WARN_ON_ONCE(!event_recorder); | |
943 | if (IS_ERR(event_recorder)) { | |
49c50022 MD |
944 | /* |
945 | * If something goes wrong in event registration | |
946 | * after the first one, we have no choice but to | |
947 | * leave the previous events in there, until | |
948 | * deleted by session teardown. | |
949 | */ | |
a67ba386 | 950 | return PTR_ERR(event_recorder); |
49c50022 | 951 | } |
a67ba386 | 952 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
953 | } |
954 | return 0; | |
955 | } | |
956 | ||
33a39a3c MD |
957 | /* |
958 | * Should be called with sessions lock held. | |
959 | */ | |
a67ba386 | 960 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler) |
49c50022 | 961 | { |
3b82c4e1 | 962 | struct lttng_channel *chan = event_enabler->chan; |
606828e4 | 963 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
964 | int ret; |
965 | ||
263b6c88 | 966 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
967 | |
968 | if (!chan->sc_table) { | |
969 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 970 | chan->sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
ebcc64cd | 971 | * sc_table.len, GFP_KERNEL); |
259b6cb3 MD |
972 | if (!chan->sc_table) |
973 | return -ENOMEM; | |
974 | } | |
5b7ac358 MD |
975 | if (!chan->sc_exit_table) { |
976 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 977 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
ebcc64cd | 978 | * sc_exit_table.len, GFP_KERNEL); |
5b7ac358 MD |
979 | if (!chan->sc_exit_table) |
980 | return -ENOMEM; | |
981 | } | |
982 | ||
259b6cb3 | 983 | |
49c50022 MD |
984 | #ifdef CONFIG_COMPAT |
985 | if (!chan->compat_sc_table) { | |
986 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 987 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
ebcc64cd | 988 | * compat_sc_table.len, GFP_KERNEL); |
49c50022 MD |
989 | if (!chan->compat_sc_table) |
990 | return -ENOMEM; | |
991 | } | |
5b7ac358 MD |
992 | |
993 | if (!chan->compat_sc_exit_table) { | |
994 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 995 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
ebcc64cd | 996 | * compat_sc_exit_table.len, GFP_KERNEL); |
5b7ac358 MD |
997 | if (!chan->compat_sc_exit_table) |
998 | return -ENOMEM; | |
999 | } | |
49c50022 | 1000 | #endif |
3b82c4e1 | 1001 | if (hlist_empty(&chan->sc_unknown)) { |
437d5aa5 | 1002 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 1003 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 1004 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a | 1005 | |
f405cfce | 1006 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
1007 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1008 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1009 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1010 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
1011 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 1012 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1013 | ev.instrumentation); |
a67ba386 MD |
1014 | WARN_ON_ONCE(!event_recorder); |
1015 | if (IS_ERR(event_recorder)) { | |
1016 | return PTR_ERR(event_recorder); | |
f405cfce | 1017 | } |
a67ba386 | 1018 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_unknown); |
f405cfce MD |
1019 | } |
1020 | ||
3b82c4e1 | 1021 | if (hlist_empty(&chan->sc_compat_unknown)) { |
437d5aa5 | 1022 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 1023 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 1024 | struct lttng_kernel_event_recorder *event_recorder; |
b76dc1a0 MD |
1025 | |
1026 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1027 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1028 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1029 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1030 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
1031 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 1032 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1033 | ev.instrumentation); |
a67ba386 MD |
1034 | WARN_ON_ONCE(!event_recorder); |
1035 | if (IS_ERR(event_recorder)) { | |
1036 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 1037 | } |
a67ba386 | 1038 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_compat_unknown); |
b76dc1a0 MD |
1039 | } |
1040 | ||
3b82c4e1 | 1041 | if (hlist_empty(&chan->compat_sc_exit_unknown)) { |
437d5aa5 | 1042 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 1043 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 1044 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a MD |
1045 | |
1046 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1047 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1048 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1049 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1050 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
1051 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 1052 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1053 | ev.instrumentation); |
a67ba386 MD |
1054 | WARN_ON_ONCE(!event_recorder); |
1055 | if (IS_ERR(event_recorder)) { | |
1056 | return PTR_ERR(event_recorder); | |
5b7ac358 | 1057 | } |
a67ba386 | 1058 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->compat_sc_exit_unknown); |
5b7ac358 MD |
1059 | } |
1060 | ||
3b82c4e1 | 1061 | if (hlist_empty(&chan->sc_exit_unknown)) { |
437d5aa5 | 1062 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 1063 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 1064 | struct lttng_kernel_event_recorder *event_recorder; |
5b7ac358 MD |
1065 | |
1066 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1067 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1068 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1069 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1070 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
1071 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 1072 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1073 | ev.instrumentation); |
a67ba386 MD |
1074 | WARN_ON_ONCE(!event_recorder); |
1075 | if (IS_ERR(event_recorder)) { | |
1076 | return PTR_ERR(event_recorder); | |
2f804c0a | 1077 | } |
a67ba386 | 1078 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_exit_unknown); |
2f804c0a MD |
1079 | } |
1080 | ||
ebcc64cd | 1081 | ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, |
a67ba386 | 1082 | chan->sc_table, event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
1083 | if (ret) |
1084 | return ret; | |
ebcc64cd | 1085 | ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, |
a67ba386 | 1086 | chan->sc_exit_table, event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
1087 | if (ret) |
1088 | return ret; | |
5b7ac358 | 1089 | |
49c50022 | 1090 | #ifdef CONFIG_COMPAT |
ebcc64cd | 1091 | ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, |
a67ba386 | 1092 | chan->compat_sc_table, event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
1093 | if (ret) |
1094 | return ret; | |
ebcc64cd | 1095 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, |
a67ba386 | 1096 | chan->compat_sc_exit_table, event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
1097 | if (ret) |
1098 | return ret; | |
1099 | #endif | |
badfe9f5 MD |
1100 | |
1101 | if (!chan->sc_filter) { | |
1102 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1103 | GFP_KERNEL); | |
1104 | if (!chan->sc_filter) | |
1105 | return -ENOMEM; | |
1106 | } | |
1107 | ||
80f87dd2 MD |
1108 | if (!chan->sys_enter_registered) { |
1109 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 1110 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1111 | if (ret) |
1112 | return ret; | |
1113 | chan->sys_enter_registered = 1; | |
1114 | } | |
63728b02 MD |
1115 | /* |
1116 | * We change the name of sys_exit tracepoint due to namespace | |
1117 | * conflict with sys_exit syscall entry. | |
1118 | */ | |
80f87dd2 MD |
1119 | if (!chan->sys_exit_registered) { |
1120 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 1121 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1122 | if (ret) { |
1123 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 1124 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
1125 | return ret; |
1126 | } | |
1127 | chan->sys_exit_registered = 1; | |
63728b02 | 1128 | } |
259b6cb3 MD |
1129 | return ret; |
1130 | } | |
1131 | ||
1132 | /* | |
8a8ac9a8 FD |
1133 | * Should be called with sessions lock held. |
1134 | */ | |
1135 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 1136 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
1137 | { |
1138 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1139 | unsigned int i; | |
1140 | int ret = 0; | |
1141 | ||
1142 | wrapper_vmalloc_sync_mappings(); | |
1143 | ||
1144 | if (!group->event_notifier_syscall_dispatch) { | |
1145 | group->event_notifier_syscall_dispatch = | |
ebcc64cd | 1146 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
1147 | GFP_KERNEL); |
1148 | if (!group->event_notifier_syscall_dispatch) | |
1149 | return -ENOMEM; | |
1150 | ||
1151 | /* Initialize all list_head */ | |
ebcc64cd | 1152 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
1153 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); |
1154 | ||
1155 | /* Init the unknown syscall notifier list. */ | |
1156 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
1157 | } | |
1158 | ||
1159 | if (!group->event_notifier_exit_syscall_dispatch) { | |
1160 | group->event_notifier_exit_syscall_dispatch = | |
ebcc64cd | 1161 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
1162 | GFP_KERNEL); |
1163 | if (!group->event_notifier_exit_syscall_dispatch) | |
1164 | return -ENOMEM; | |
1165 | ||
1166 | /* Initialize all list_head */ | |
ebcc64cd | 1167 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
1168 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); |
1169 | ||
1170 | /* Init the unknown exit syscall notifier list. */ | |
1171 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
1172 | } | |
1173 | ||
1174 | #ifdef CONFIG_COMPAT | |
1175 | if (!group->event_notifier_compat_syscall_dispatch) { | |
1176 | group->event_notifier_compat_syscall_dispatch = | |
ebcc64cd | 1177 | kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, |
8a8ac9a8 FD |
1178 | GFP_KERNEL); |
1179 | if (!group->event_notifier_syscall_dispatch) | |
1180 | return -ENOMEM; | |
1181 | ||
1182 | /* Initialize all list_head */ | |
ebcc64cd | 1183 | for (i = 0; i < compat_sc_table.len; i++) |
8a8ac9a8 FD |
1184 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); |
1185 | ||
1186 | /* Init the unknown syscall notifier list. */ | |
1187 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
1188 | } | |
1189 | ||
1190 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
1191 | group->event_notifier_exit_compat_syscall_dispatch = | |
ebcc64cd | 1192 | kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, |
8a8ac9a8 FD |
1193 | GFP_KERNEL); |
1194 | if (!group->event_notifier_exit_syscall_dispatch) | |
1195 | return -ENOMEM; | |
1196 | ||
1197 | /* Initialize all list_head */ | |
ebcc64cd | 1198 | for (i = 0; i < compat_sc_exit_table.len; i++) |
8a8ac9a8 FD |
1199 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); |
1200 | ||
1201 | /* Init the unknown exit syscall notifier list. */ | |
1202 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
1203 | } | |
1204 | #endif | |
1205 | ||
1206 | if (!group->sc_filter) { | |
1207 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1208 | GFP_KERNEL); | |
1209 | if (!group->sc_filter) | |
1210 | return -ENOMEM; | |
1211 | } | |
1212 | ||
1213 | if (!group->sys_enter_registered) { | |
1214 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
1215 | (void *) syscall_entry_event_notifier_probe, group); | |
1216 | if (ret) | |
1217 | return ret; | |
1218 | group->sys_enter_registered = 1; | |
1219 | } | |
1220 | ||
1221 | if (!group->sys_exit_registered) { | |
1222 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
1223 | (void *) syscall_exit_event_notifier_probe, group); | |
1224 | if (ret) { | |
1225 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1226 | (void *) syscall_entry_event_notifier_probe, group)); | |
1227 | return ret; | |
1228 | } | |
1229 | group->sys_exit_registered = 1; | |
1230 | } | |
1231 | ||
1232 | return ret; | |
1233 | } | |
1234 | ||
1235 | static | |
1236 | int create_unknown_event_notifier( | |
1237 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1238 | enum sc_type type) | |
1239 | { | |
a67ba386 MD |
1240 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1241 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 1242 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1243 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
606828e4 | 1244 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 | 1245 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1246 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1247 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
1248 | event_notifier_enabler); | |
1249 | struct hlist_head *unknown_dispatch_list; | |
1250 | int ret = 0; | |
1251 | bool found = false; | |
606828e4 MD |
1252 | enum lttng_kernel_abi_syscall_abi abi; |
1253 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
1254 | struct hlist_head *head; |
1255 | ||
1256 | switch (type) { | |
1257 | case SC_TYPE_ENTRY: | |
1258 | desc = &__event_desc___syscall_entry_unknown; | |
1259 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
606828e4 MD |
1260 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1261 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1262 | break; |
1263 | case SC_TYPE_EXIT: | |
1264 | desc = &__event_desc___syscall_exit_unknown; | |
1265 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
606828e4 MD |
1266 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1267 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1268 | break; |
1269 | case SC_TYPE_COMPAT_ENTRY: | |
1270 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1271 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1272 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1273 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1274 | break; |
1275 | case SC_TYPE_COMPAT_EXIT: | |
1276 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1277 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1278 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1279 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1280 | break; |
1281 | default: | |
1282 | BUG_ON(1); | |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | * Check if already created. | |
1287 | */ | |
1288 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1289 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1290 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1291 | if (event_notifier_priv->parent.desc == desc && | |
1292 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
1293 | found = true; |
1294 | } | |
1295 | if (found) | |
1296 | goto end; | |
1297 | ||
1298 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 1299 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 1300 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 1301 | |
606828e4 | 1302 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 1303 | |
606828e4 | 1304 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
1305 | event_notifier_param.event.u.syscall.abi = abi; |
1306 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1307 | ||
a67ba386 MD |
1308 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1309 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 1310 | event_notifier_param.event.instrumentation); |
a67ba386 | 1311 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 1312 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 1313 | desc->event_name); |
8a8ac9a8 FD |
1314 | ret = -ENOMEM; |
1315 | goto end; | |
1316 | } | |
1317 | ||
a67ba386 | 1318 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
1319 | |
1320 | end: | |
1321 | return ret; | |
1322 | } | |
1323 | ||
1324 | static int create_matching_event_notifiers( | |
1325 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 1326 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
1327 | size_t table_len, enum sc_type type) |
1328 | { | |
1329 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 1330 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1331 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1332 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1333 | unsigned int i; |
1334 | int ret = 0; | |
1335 | ||
1336 | /* iterate over all syscall and create event_notifier that match */ | |
1337 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
1338 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1339 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 1340 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
1341 | struct hlist_head *head; |
1342 | int found = 0; | |
1343 | ||
1344 | desc = table[i].desc; | |
1345 | if (!desc) { | |
1346 | /* Unknown syscall */ | |
1347 | continue; | |
1348 | } | |
1349 | ||
1350 | if (!lttng_desc_match_enabler(desc, | |
1351 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1352 | continue; | |
1353 | ||
1354 | /* | |
1355 | * Check if already created. | |
1356 | */ | |
1357 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1358 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1359 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1360 | if (event_notifier_priv->parent.desc == desc | |
1361 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
8a8ac9a8 FD |
1362 | found = 1; |
1363 | } | |
1364 | if (found) | |
1365 | continue; | |
1366 | ||
1367 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1368 | switch (type) { | |
1369 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1370 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1371 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1372 | break; |
1373 | case SC_TYPE_EXIT: | |
606828e4 MD |
1374 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1375 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1376 | break; |
1377 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1378 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1379 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1380 | break; |
1381 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1382 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1383 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1384 | break; |
1385 | } | |
437d5aa5 | 1386 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1387 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1388 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1389 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1390 | |
99f52fcc FD |
1391 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1392 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1393 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1394 | if (IS_ERR(event_notifier)) { |
1395 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1396 | desc->event_name); |
8a8ac9a8 FD |
1397 | ret = -ENOMEM; |
1398 | goto end; | |
1399 | } | |
1400 | ||
a67ba386 | 1401 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1402 | } |
1403 | ||
1404 | end: | |
1405 | return ret; | |
1406 | ||
1407 | } | |
1408 | ||
a67ba386 MD |
1409 | int lttng_syscalls_create_matching_event_notifiers( |
1410 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1411 | { |
1412 | int ret; | |
1413 | struct lttng_enabler *base_enabler = | |
1414 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
606828e4 | 1415 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1416 | base_enabler->event_param.u.syscall.entryexit; |
1417 | ||
606828e4 | 1418 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1419 | ret = create_matching_event_notifiers(event_notifier_enabler, |
ebcc64cd | 1420 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1421 | if (ret) |
1422 | goto end; | |
1423 | ||
1424 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
ebcc64cd | 1425 | compat_sc_table.table, compat_sc_table.len, |
8a8ac9a8 FD |
1426 | SC_TYPE_COMPAT_ENTRY); |
1427 | if (ret) | |
1428 | goto end; | |
1429 | ||
1430 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1431 | SC_TYPE_ENTRY); | |
1432 | if (ret) | |
1433 | goto end; | |
1434 | ||
1435 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1436 | SC_TYPE_COMPAT_ENTRY); | |
1437 | if (ret) | |
1438 | goto end; | |
1439 | } | |
1440 | ||
606828e4 | 1441 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1442 | ret = create_matching_event_notifiers(event_notifier_enabler, |
ebcc64cd | 1443 | sc_exit_table.table, sc_exit_table.len, |
8a8ac9a8 FD |
1444 | SC_TYPE_EXIT); |
1445 | if (ret) | |
1446 | goto end; | |
1447 | ||
1448 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1449 | SC_TYPE_EXIT); | |
1450 | if (ret) | |
1451 | goto end; | |
1452 | ||
1453 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
ebcc64cd | 1454 | compat_sc_exit_table.table, compat_sc_exit_table.len, |
8a8ac9a8 FD |
1455 | SC_TYPE_COMPAT_EXIT); |
1456 | if (ret) | |
1457 | goto end; | |
1458 | ||
1459 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1460 | SC_TYPE_COMPAT_EXIT); | |
1461 | if (ret) | |
1462 | goto end; | |
1463 | } | |
1464 | ||
1465 | end: | |
1466 | return ret; | |
1467 | } | |
1468 | ||
1469 | /* | |
1470 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1471 | */ |
3b82c4e1 | 1472 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1473 | struct lttng_event_notifier_group *event_notifier_group) |
1474 | { | |
1475 | int ret; | |
1476 | ||
1477 | /* | |
1478 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1479 | * At the moment, we don't think it's desirable to have one fired | |
1480 | * event_notifier for the entry and one for the exit of a syscall. | |
1481 | */ | |
1482 | if (event_notifier_group->sys_enter_registered) { | |
1483 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1484 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1485 | if (ret) | |
1486 | return ret; | |
1487 | event_notifier_group->sys_enter_registered = 0; | |
1488 | } | |
1489 | if (event_notifier_group->sys_exit_registered) { | |
1490 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1491 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1492 | if (ret) | |
1493 | return ret; | |
1494 | event_notifier_group->sys_enter_registered = 0; | |
1495 | } | |
1496 | ||
1497 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1498 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1499 | #ifdef CONFIG_COMPAT | |
1500 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1501 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1502 | #endif | |
1503 | return 0; | |
1504 | } | |
1505 | ||
3b82c4e1 | 1506 | int lttng_syscalls_unregister_channel(struct lttng_channel *chan) |
259b6cb3 MD |
1507 | { |
1508 | int ret; | |
1509 | ||
1510 | if (!chan->sc_table) | |
1511 | return 0; | |
80f87dd2 | 1512 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1513 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1514 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1515 | if (ret) |
1516 | return ret; | |
1517 | chan->sys_enter_registered = 0; | |
1518 | } | |
1519 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1520 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1521 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1522 | if (ret) |
1523 | return ret; | |
1524 | chan->sys_exit_registered = 0; | |
1525 | } | |
badfe9f5 MD |
1526 | return 0; |
1527 | } | |
1528 | ||
2d6d88c6 | 1529 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 1530 | { |
259b6cb3 | 1531 | kfree(chan->sc_table); |
5b7ac358 | 1532 | kfree(chan->sc_exit_table); |
49c50022 MD |
1533 | #ifdef CONFIG_COMPAT |
1534 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1535 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1536 | #endif |
80f87dd2 MD |
1537 | kfree(chan->sc_filter); |
1538 | return 0; | |
1539 | } | |
1540 | ||
1541 | static | |
1542 | int get_syscall_nr(const char *syscall_name) | |
1543 | { | |
1544 | int syscall_nr = -1; | |
1545 | int i; | |
1546 | ||
ebcc64cd | 1547 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 1548 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1549 | const char *it_name; |
80f87dd2 | 1550 | |
ebcc64cd | 1551 | entry = &sc_table.table[i]; |
80f87dd2 MD |
1552 | if (!entry->desc) |
1553 | continue; | |
437d5aa5 | 1554 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1555 | it_name += strlen(SYSCALL_ENTRY_STR); |
1556 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1557 | syscall_nr = i; |
1558 | break; | |
1559 | } | |
1560 | } | |
1561 | return syscall_nr; | |
1562 | } | |
1563 | ||
1564 | static | |
1565 | int get_compat_syscall_nr(const char *syscall_name) | |
1566 | { | |
1567 | int syscall_nr = -1; | |
1568 | int i; | |
1569 | ||
ebcc64cd | 1570 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 1571 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1572 | const char *it_name; |
80f87dd2 | 1573 | |
ebcc64cd | 1574 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
1575 | if (!entry->desc) |
1576 | continue; | |
437d5aa5 | 1577 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1578 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1579 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1580 | syscall_nr = i; |
1581 | break; | |
1582 | } | |
1583 | } | |
1584 | return syscall_nr; | |
1585 | } | |
1586 | ||
12e579db MD |
1587 | static |
1588 | uint32_t get_sc_tables_len(void) | |
1589 | { | |
ebcc64cd | 1590 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
1591 | } |
1592 | ||
badfe9f5 | 1593 | static |
ade8a729 FD |
1594 | const char *get_syscall_name(const char *desc_name, |
1595 | enum lttng_syscall_abi abi, | |
1596 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1597 | { |
badfe9f5 | 1598 | size_t prefix_len = 0; |
80f87dd2 | 1599 | |
80f87dd2 | 1600 | |
ade8a729 | 1601 | switch (entryexit) { |
badfe9f5 | 1602 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1603 | switch (abi) { |
badfe9f5 MD |
1604 | case LTTNG_SYSCALL_ABI_NATIVE: |
1605 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1606 | break; | |
1607 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1608 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1609 | break; | |
80f87dd2 | 1610 | } |
badfe9f5 MD |
1611 | break; |
1612 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1613 | switch (abi) { |
badfe9f5 MD |
1614 | case LTTNG_SYSCALL_ABI_NATIVE: |
1615 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1616 | break; | |
1617 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1618 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1619 | break; | |
80f87dd2 | 1620 | } |
badfe9f5 | 1621 | break; |
80f87dd2 | 1622 | } |
badfe9f5 | 1623 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1624 | return desc_name + prefix_len; |
badfe9f5 MD |
1625 | } |
1626 | ||
ade8a729 FD |
1627 | static |
1628 | int lttng_syscall_filter_enable( | |
1629 | struct lttng_syscall_filter *filter, | |
1630 | const char *desc_name, enum lttng_syscall_abi abi, | |
1631 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1632 | { |
badfe9f5 MD |
1633 | const char *syscall_name; |
1634 | unsigned long *bitmap; | |
1635 | int syscall_nr; | |
1636 | ||
ade8a729 | 1637 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1638 | |
ade8a729 | 1639 | switch (abi) { |
badfe9f5 MD |
1640 | case LTTNG_SYSCALL_ABI_NATIVE: |
1641 | syscall_nr = get_syscall_nr(syscall_name); | |
1642 | break; | |
1643 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1644 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1645 | break; | |
1646 | default: | |
1647 | return -EINVAL; | |
80f87dd2 | 1648 | } |
badfe9f5 MD |
1649 | if (syscall_nr < 0) |
1650 | return -ENOENT; | |
1651 | ||
ade8a729 | 1652 | switch (entryexit) { |
badfe9f5 | 1653 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1654 | switch (abi) { |
badfe9f5 MD |
1655 | case LTTNG_SYSCALL_ABI_NATIVE: |
1656 | bitmap = filter->sc_entry; | |
1657 | break; | |
1658 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1659 | bitmap = filter->sc_compat_entry; | |
1660 | break; | |
6d9694d8 MD |
1661 | default: |
1662 | return -EINVAL; | |
80f87dd2 | 1663 | } |
badfe9f5 MD |
1664 | break; |
1665 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1666 | switch (abi) { |
badfe9f5 MD |
1667 | case LTTNG_SYSCALL_ABI_NATIVE: |
1668 | bitmap = filter->sc_exit; | |
1669 | break; | |
1670 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1671 | bitmap = filter->sc_compat_exit; | |
1672 | break; | |
6d9694d8 MD |
1673 | default: |
1674 | return -EINVAL; | |
80f87dd2 | 1675 | } |
badfe9f5 MD |
1676 | break; |
1677 | default: | |
1678 | return -EINVAL; | |
80f87dd2 | 1679 | } |
badfe9f5 MD |
1680 | if (test_bit(syscall_nr, bitmap)) |
1681 | return -EEXIST; | |
1682 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1683 | return 0; |
80f87dd2 MD |
1684 | } |
1685 | ||
8a8ac9a8 | 1686 | int lttng_syscall_filter_enable_event_notifier( |
a67ba386 | 1687 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1688 | { |
a67ba386 MD |
1689 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
1690 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; | |
8a8ac9a8 FD |
1691 | struct hlist_head *dispatch_list; |
1692 | int ret = 0; | |
1693 | ||
a67ba386 | 1694 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
1695 | |
1696 | ret = lttng_syscall_filter_enable(group->sc_filter, | |
a67ba386 MD |
1697 | event_notifier->priv->parent.desc->event_name, |
1698 | event_notifier->priv->parent.u.syscall.abi, | |
1699 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1700 | if (ret) { |
1701 | goto end; | |
1702 | } | |
1703 | ||
a67ba386 | 1704 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 1705 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 1706 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1707 | case LTTNG_SYSCALL_ABI_NATIVE: |
1708 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1709 | break; | |
1710 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1711 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1712 | break; | |
6866b1c7 MJ |
1713 | default: |
1714 | ret = -EINVAL; | |
1715 | goto end; | |
8a8ac9a8 FD |
1716 | } |
1717 | break; | |
1718 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 1719 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1720 | case LTTNG_SYSCALL_ABI_NATIVE: |
1721 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1722 | break; | |
1723 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1724 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1725 | break; | |
6866b1c7 MJ |
1726 | default: |
1727 | ret = -EINVAL; | |
1728 | goto end; | |
8a8ac9a8 FD |
1729 | } |
1730 | break; | |
6866b1c7 MJ |
1731 | default: |
1732 | ret = -EINVAL; | |
1733 | goto end; | |
8a8ac9a8 FD |
1734 | } |
1735 | ||
a67ba386 | 1736 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
1737 | |
1738 | end: | |
1739 | return ret ; | |
1740 | } | |
1741 | ||
ade8a729 FD |
1742 | int lttng_syscall_filter_enable_event( |
1743 | struct lttng_channel *channel, | |
a67ba386 | 1744 | struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 1745 | { |
a67ba386 | 1746 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 FD |
1747 | |
1748 | return lttng_syscall_filter_enable(channel->sc_filter, | |
a67ba386 MD |
1749 | event_recorder->priv->parent.desc->event_name, |
1750 | event_recorder->priv->parent.u.syscall.abi, | |
1751 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1752 | } |
1753 | ||
1754 | static | |
1755 | int lttng_syscall_filter_disable( | |
1756 | struct lttng_syscall_filter *filter, | |
1757 | const char *desc_name, enum lttng_syscall_abi abi, | |
1758 | enum lttng_syscall_entryexit entryexit) | |
1759 | { | |
badfe9f5 MD |
1760 | const char *syscall_name; |
1761 | unsigned long *bitmap; | |
1762 | int syscall_nr; | |
80f87dd2 | 1763 | |
ade8a729 | 1764 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1765 | |
ade8a729 | 1766 | switch (abi) { |
badfe9f5 MD |
1767 | case LTTNG_SYSCALL_ABI_NATIVE: |
1768 | syscall_nr = get_syscall_nr(syscall_name); | |
1769 | break; | |
1770 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1771 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1772 | break; | |
1773 | default: | |
1774 | return -EINVAL; | |
80f87dd2 | 1775 | } |
badfe9f5 MD |
1776 | if (syscall_nr < 0) |
1777 | return -ENOENT; | |
80f87dd2 | 1778 | |
ade8a729 | 1779 | switch (entryexit) { |
badfe9f5 | 1780 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1781 | switch (abi) { |
badfe9f5 MD |
1782 | case LTTNG_SYSCALL_ABI_NATIVE: |
1783 | bitmap = filter->sc_entry; | |
1784 | break; | |
1785 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1786 | bitmap = filter->sc_compat_entry; | |
1787 | break; | |
6d9694d8 MD |
1788 | default: |
1789 | return -EINVAL; | |
80f87dd2 | 1790 | } |
badfe9f5 MD |
1791 | break; |
1792 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1793 | switch (abi) { |
badfe9f5 MD |
1794 | case LTTNG_SYSCALL_ABI_NATIVE: |
1795 | bitmap = filter->sc_exit; | |
1796 | break; | |
1797 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1798 | bitmap = filter->sc_compat_exit; | |
1799 | break; | |
6d9694d8 MD |
1800 | default: |
1801 | return -EINVAL; | |
80f87dd2 | 1802 | } |
badfe9f5 MD |
1803 | break; |
1804 | default: | |
1805 | return -EINVAL; | |
80f87dd2 | 1806 | } |
badfe9f5 MD |
1807 | if (!test_bit(syscall_nr, bitmap)) |
1808 | return -EEXIST; | |
1809 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1810 | |
badfe9f5 | 1811 | return 0; |
259b6cb3 | 1812 | } |
2d2464bd | 1813 | |
8a8ac9a8 | 1814 | int lttng_syscall_filter_disable_event_notifier( |
a67ba386 | 1815 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1816 | { |
a67ba386 | 1817 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
8a8ac9a8 FD |
1818 | int ret; |
1819 | ||
a67ba386 | 1820 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
1821 | |
1822 | ret = lttng_syscall_filter_disable(group->sc_filter, | |
a67ba386 MD |
1823 | event_notifier->priv->parent.desc->event_name, |
1824 | event_notifier->priv->parent.u.syscall.abi, | |
1825 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1826 | WARN_ON_ONCE(ret != 0); |
1827 | ||
a67ba386 | 1828 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
1829 | return 0; |
1830 | } | |
1831 | ||
ade8a729 FD |
1832 | int lttng_syscall_filter_disable_event( |
1833 | struct lttng_channel *channel, | |
a67ba386 | 1834 | struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 FD |
1835 | { |
1836 | return lttng_syscall_filter_disable(channel->sc_filter, | |
a67ba386 MD |
1837 | event_recorder->priv->parent.desc->event_name, |
1838 | event_recorder->priv->parent.u.syscall.abi, | |
1839 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1840 | } |
1841 | ||
2d2464bd MD |
1842 | static |
1843 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1844 | { | |
1845 | const struct trace_syscall_entry *entry; | |
1846 | int iter = 0; | |
1847 | ||
ebcc64cd FD |
1848 | for (entry = sc_table.table; |
1849 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1850 | entry++) { |
1851 | if (iter++ >= *pos) | |
1852 | return entry; | |
1853 | } | |
ebcc64cd FD |
1854 | for (entry = compat_sc_table.table; |
1855 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1856 | entry++) { |
1857 | if (iter++ >= *pos) | |
1858 | return entry; | |
1859 | } | |
1860 | /* End of list */ | |
1861 | return NULL; | |
1862 | } | |
1863 | ||
1864 | static | |
1865 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1866 | { | |
1867 | return (void *) syscall_list_get_entry(pos); | |
1868 | } | |
1869 | ||
1870 | static | |
1871 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1872 | { | |
1873 | (*ppos)++; | |
1874 | return (void *) syscall_list_get_entry(ppos); | |
1875 | } | |
1876 | ||
1877 | static | |
1878 | void syscall_list_stop(struct seq_file *m, void *p) | |
1879 | { | |
1880 | } | |
1881 | ||
12e579db MD |
1882 | static |
1883 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1884 | const struct trace_syscall_entry **table, | |
1885 | unsigned int *bitness) | |
1886 | { | |
ebcc64cd | 1887 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1888 | if (bitness) |
1889 | *bitness = BITS_PER_LONG; | |
1890 | if (table) | |
ebcc64cd | 1891 | *table = sc_table.table; |
12e579db MD |
1892 | return 0; |
1893 | } | |
ebcc64cd FD |
1894 | if (!(entry >= compat_sc_table.table |
1895 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1896 | return -EINVAL; |
1897 | } | |
1898 | if (bitness) | |
1899 | *bitness = 32; | |
1900 | if (table) | |
ebcc64cd | 1901 | *table = compat_sc_table.table; |
12e579db MD |
1902 | return 0; |
1903 | } | |
1904 | ||
2d2464bd MD |
1905 | static |
1906 | int syscall_list_show(struct seq_file *m, void *p) | |
1907 | { | |
1908 | const struct trace_syscall_entry *table, *entry = p; | |
1909 | unsigned int bitness; | |
d4291869 | 1910 | unsigned long index; |
12e579db | 1911 | int ret; |
d4291869 | 1912 | const char *name; |
2d2464bd | 1913 | |
12e579db MD |
1914 | ret = get_sc_table(entry, &table, &bitness); |
1915 | if (ret) | |
1916 | return ret; | |
f4855b46 MD |
1917 | if (!entry->desc) |
1918 | return 0; | |
ebcc64cd | 1919 | if (table == sc_table.table) { |
d4291869 | 1920 | index = entry - table; |
437d5aa5 | 1921 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1922 | } else { |
ebcc64cd | 1923 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1924 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1925 | } |
12e579db | 1926 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1927 | index, name, bitness); |
2d2464bd MD |
1928 | return 0; |
1929 | } | |
1930 | ||
1931 | static | |
1932 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1933 | .start = syscall_list_start, | |
1934 | .next = syscall_list_next, | |
1935 | .stop = syscall_list_stop, | |
1936 | .show = syscall_list_show, | |
1937 | }; | |
1938 | ||
1939 | static | |
1940 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1941 | { | |
1942 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1943 | } | |
1944 | ||
1945 | const struct file_operations lttng_syscall_list_fops = { | |
1946 | .owner = THIS_MODULE, | |
1947 | .open = lttng_syscall_list_open, | |
1948 | .read = seq_read, | |
1949 | .llseek = seq_lseek, | |
1950 | .release = seq_release, | |
1951 | }; | |
12e579db | 1952 | |
badfe9f5 MD |
1953 | /* |
1954 | * A syscall is enabled if it is traced for either entry or exit. | |
1955 | */ | |
12e579db | 1956 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
606828e4 | 1957 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1958 | { |
1959 | uint32_t len, sc_tables_len, bitmask_len; | |
1960 | int ret = 0, bit; | |
1961 | char *tmp_mask; | |
1962 | struct lttng_syscall_filter *filter; | |
1963 | ||
1964 | ret = get_user(len, &usyscall_mask->len); | |
1965 | if (ret) | |
1966 | return ret; | |
1967 | sc_tables_len = get_sc_tables_len(); | |
1968 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1969 | if (len < sc_tables_len) { | |
1970 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1971 | } | |
1972 | /* Array is large enough, we can copy array to user-space. */ | |
1973 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1974 | if (!tmp_mask) | |
1975 | return -ENOMEM; | |
1976 | filter = channel->sc_filter; | |
1977 | ||
ebcc64cd | 1978 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1979 | char state; |
2f25059d MD |
1980 | |
1981 | if (channel->sc_table) { | |
3b82c4e1 MD |
1982 | if (!(READ_ONCE(channel->syscall_all_entry) |
1983 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1984 | state = test_bit(bit, filter->sc_entry) |
1985 | || test_bit(bit, filter->sc_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 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1994 | char state; |
2f25059d MD |
1995 | |
1996 | if (channel->compat_sc_table) { | |
3b82c4e1 MD |
1997 | if (!(READ_ONCE(channel->syscall_all_entry) |
1998 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
ebcc64cd | 1999 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 2000 | filter->sc_compat_entry) |
ebcc64cd | 2001 | || test_bit(bit - sc_table.len, |
badfe9f5 | 2002 | filter->sc_compat_exit); |
2f25059d MD |
2003 | else |
2004 | state = 1; | |
2005 | } else { | |
2006 | state = 0; | |
2007 | } | |
2008 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
2009 | } |
2010 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
2011 | ret = -EFAULT; | |
2012 | kfree(tmp_mask); | |
2013 | return ret; | |
2014 | } | |
082d4946 MD |
2015 | |
2016 | int lttng_abi_syscall_list(void) | |
2017 | { | |
2018 | struct file *syscall_list_file; | |
2019 | int file_fd, ret; | |
2020 | ||
4ac10b76 | 2021 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
2022 | if (file_fd < 0) { |
2023 | ret = file_fd; | |
2024 | goto fd_error; | |
2025 | } | |
2026 | ||
2027 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
2028 | <tng_syscall_list_fops, | |
2029 | NULL, O_RDWR); | |
2030 | if (IS_ERR(syscall_list_file)) { | |
2031 | ret = PTR_ERR(syscall_list_file); | |
2032 | goto file_error; | |
2033 | } | |
2034 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
2035 | if (ret < 0) | |
2036 | goto open_error; | |
2037 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
2038 | return file_fd; |
2039 | ||
2040 | open_error: | |
2041 | fput(syscall_list_file); | |
2042 | file_error: | |
2043 | put_unused_fd(file_fd); | |
2044 | fd_error: | |
2045 | return ret; | |
2046 | } |