Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
259b6cb3 MD |
3 | * lttng-syscalls.c |
4 | * | |
2faf7d1b | 5 | * LTTng syscall probes. |
259b6cb3 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
259b6cb3 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
6333ace3 | 12 | #include <linux/compat.h> |
abc0446a | 13 | #include <linux/err.h> |
80f87dd2 | 14 | #include <linux/bitmap.h> |
7ca580f8 MD |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
2d2464bd | 17 | #include <linux/seq_file.h> |
d4291869 | 18 | #include <linux/stringify.h> |
082d4946 MD |
19 | #include <linux/file.h> |
20 | #include <linux/anon_inodes.h> | |
c8dfb724 | 21 | #include <linux/fcntl.h> |
3cf55950 | 22 | #include <linux/mman.h> |
259b6cb3 MD |
23 | #include <asm/ptrace.h> |
24 | #include <asm/syscall.h> | |
25 | ||
a071f25d | 26 | #include <lttng/bitfield.h> |
241ae9a8 MD |
27 | #include <wrapper/tracepoint.h> |
28 | #include <wrapper/file.h> | |
29 | #include <wrapper/rcu.h> | |
1b7b9c65 | 30 | #include <wrapper/syscall.h> |
2df37e95 | 31 | #include <lttng/events.h> |
8a8ac9a8 | 32 | #include <lttng/utils.h> |
259b6cb3 | 33 | |
6333ace3 | 34 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
35 | # ifndef is_compat_task |
36 | # define is_compat_task() (0) | |
37 | # endif | |
6333ace3 MD |
38 | #endif |
39 | ||
1aa3298b MD |
40 | /* in_compat_syscall appears in kernel 4.6. */ |
41 | #ifndef in_compat_syscall | |
42 | #define in_compat_syscall() is_compat_task() | |
43 | #endif | |
44 | ||
5b7ac358 MD |
45 | enum sc_type { |
46 | SC_TYPE_ENTRY, | |
47 | SC_TYPE_EXIT, | |
48 | SC_TYPE_COMPAT_ENTRY, | |
49 | SC_TYPE_COMPAT_EXIT, | |
50 | }; | |
51 | ||
d4291869 MD |
52 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
53 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
54 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
55 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
56 | ||
57 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
58 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
59 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
60 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 61 | |
a93244f8 | 62 | static |
2d6d88c6 | 63 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 | 64 | static |
2d6d88c6 | 65 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 66 | |
8a8ac9a8 FD |
67 | static |
68 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, | |
69 | long id); | |
70 | static | |
71 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
72 | long ret); | |
73 | ||
3a523f5b MD |
74 | /* |
75 | * Forward declarations for old kernels. | |
76 | */ | |
77 | struct mmsghdr; | |
78 | struct rlimit64; | |
79 | struct oldold_utsname; | |
80 | struct old_utsname; | |
81 | struct sel_arg_struct; | |
82 | struct mmap_arg_struct; | |
c0b71117 | 83 | struct file_handle; |
a292e6f1 | 84 | struct user_msghdr; |
3a523f5b | 85 | |
9eb15e8b MJ |
86 | /* |
87 | * Forward declaration for kernels >= 5.6 | |
88 | */ | |
89 | struct timex; | |
edfdcb68 MJ |
90 | struct timeval; |
91 | struct itimerval; | |
92 | struct itimerspec; | |
93 | ||
5f4c791e | 94 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
95 | typedef __kernel_old_time_t time_t; |
96 | #endif | |
9eb15e8b | 97 | |
80f87dd2 MD |
98 | #ifdef IA32_NR_syscalls |
99 | #define NR_compat_syscalls IA32_NR_syscalls | |
100 | #else | |
101 | #define NR_compat_syscalls NR_syscalls | |
102 | #endif | |
103 | ||
259b6cb3 MD |
104 | /* |
105 | * Create LTTng tracepoint probes. | |
106 | */ | |
107 | #define LTTNG_PACKAGE_BUILD | |
108 | #define CREATE_TRACE_POINTS | |
2655f9ad | 109 | #define TP_MODULE_NOINIT |
c075712b | 110 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 111 | |
a93244f8 MD |
112 | #define PARAMS(args...) args |
113 | ||
5b7ac358 | 114 | /* Handle unknown syscalls */ |
72a52753 | 115 | #undef TRACE_SYSTEM |
5b7ac358 | 116 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 117 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
118 | #undef TRACE_SYSTEM |
119 | ||
fc4f7161 MD |
120 | #define SC_ENTER |
121 | ||
fc4f7161 MD |
122 | #undef sc_exit |
123 | #define sc_exit(...) | |
b75d00c4 MD |
124 | #undef sc_in |
125 | #define sc_in(...) __VA_ARGS__ | |
126 | #undef sc_out | |
127 | #define sc_out(...) | |
128 | #undef sc_inout | |
129 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
130 | |
131 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 132 | #undef TP_PROBE_CB |
2d6d88c6 | 133 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
57ede728 | 134 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 135 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 136 | PARAMS(_fields)) |
265822ae | 137 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 138 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
139 | PARAMS(_locvar), PARAMS(_code_pre), \ |
140 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
141 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
142 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 143 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 144 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
145 | /* Enumerations only defined at first inclusion. */ |
146 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
147 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 148 | #undef TRACE_SYSTEM |
d4291869 | 149 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 150 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 151 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 152 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 153 | #undef TRACE_SYSTEM |
d4291869 | 154 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 155 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 156 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 157 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 158 | #undef TRACE_SYSTEM |
141ddf28 | 159 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
160 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
161 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
162 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
163 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 164 | #undef TP_PROBE_CB |
3bc29f0a MD |
165 | #undef _TRACE_SYSCALLS_INTEGERS_H |
166 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
167 | |
168 | /* Hijack probe callback for compat system call enter */ | |
2d6d88c6 | 169 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
771af27e | 170 | #define LTTNG_SC_COMPAT |
57ede728 | 171 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 172 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 173 | PARAMS(_fields)) |
265822ae | 174 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 175 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 176 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
177 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
178 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 179 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
180 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
181 | compat_syscall_entry_##_name) | |
141ddf28 MD |
182 | /* Enumerations only defined at inital inclusion (not here). */ |
183 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 184 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 185 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 186 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
187 | #undef TRACE_INCLUDE_FILE |
188 | #undef TRACE_SYSTEM | |
d4291869 | 189 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 190 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 191 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
192 | #undef TRACE_INCLUDE_FILE |
193 | #undef TRACE_SYSTEM | |
141ddf28 | 194 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
195 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
196 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
197 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
198 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 199 | #undef TP_PROBE_CB |
3bc29f0a MD |
200 | #undef _TRACE_SYSCALLS_INTEGERS_H |
201 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 202 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 203 | |
fc4f7161 MD |
204 | #undef SC_ENTER |
205 | ||
206 | #define SC_EXIT | |
207 | ||
fc4f7161 MD |
208 | #undef sc_exit |
209 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
210 | #undef sc_in |
211 | #define sc_in(...) | |
212 | #undef sc_out | |
213 | #define sc_out(...) __VA_ARGS__ | |
214 | #undef sc_inout | |
215 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
216 | |
217 | /* Hijack probe callback for system call exit */ | |
2d6d88c6 | 218 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
57ede728 | 219 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 220 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 221 | PARAMS(_fields)) |
265822ae | 222 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 223 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 224 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
225 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
226 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
227 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
228 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 229 | syscall_exit_##_name) |
141ddf28 MD |
230 | /* Enumerations only defined at inital inclusion (not here). */ |
231 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
232 | #define TRACE_SYSTEM syscall_exit_integers |
233 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 234 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
235 | #undef TRACE_INCLUDE_FILE |
236 | #undef TRACE_SYSTEM | |
237 | #define TRACE_SYSTEM syscall_exit_pointers | |
238 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 239 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
240 | #undef TRACE_INCLUDE_FILE |
241 | #undef TRACE_SYSTEM | |
141ddf28 | 242 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
243 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
244 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
245 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
246 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 247 | #undef TP_PROBE_CB |
3bc29f0a MD |
248 | #undef _TRACE_SYSCALLS_INTEGERS_H |
249 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
250 | |
251 | ||
252 | /* Hijack probe callback for compat system call exit */ | |
2d6d88c6 | 253 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
771af27e | 254 | #define LTTNG_SC_COMPAT |
57ede728 | 255 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 256 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 257 | PARAMS(_fields)) |
265822ae | 258 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 259 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 260 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
261 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
262 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 263 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 264 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 265 | compat_syscall_exit_##_name) |
141ddf28 MD |
266 | /* Enumerations only defined at inital inclusion (not here). */ |
267 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
268 | #define TRACE_SYSTEM compat_syscall_exit_integers |
269 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 270 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 271 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 272 | #undef TRACE_SYSTEM |
5b7ac358 MD |
273 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
274 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 275 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 276 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 277 | #undef TRACE_SYSTEM |
141ddf28 | 278 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
279 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
280 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
281 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
282 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 283 | #undef TP_PROBE_CB |
3bc29f0a MD |
284 | #undef _TRACE_SYSCALLS_INTEGERS_H |
285 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 286 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 287 | |
fc4f7161 | 288 | #undef SC_EXIT |
259b6cb3 | 289 | |
2655f9ad | 290 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
291 | #undef LTTNG_PACKAGE_BUILD |
292 | #undef CREATE_TRACE_POINTS | |
293 | ||
a93244f8 | 294 | struct trace_syscall_entry { |
2d6d88c6 | 295 | void *event_func; |
437d5aa5 MD |
296 | const struct lttng_kernel_event_desc *desc; |
297 | const struct lttng_kernel_event_field **fields; | |
a93244f8 MD |
298 | unsigned int nrargs; |
299 | }; | |
300 | ||
301 | #define CREATE_SYSCALL_TABLE | |
302 | ||
fc4f7161 MD |
303 | #define SC_ENTER |
304 | ||
305 | #undef sc_exit | |
306 | #define sc_exit(...) | |
307 | ||
259b6cb3 | 308 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 309 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 310 | [ _nr ] = { \ |
2d6d88c6 | 311 | .event_func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 312 | .nrargs = (_nrargs), \ |
d4291869 MD |
313 | .fields = __event_fields___syscall_entry_##_template, \ |
314 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
315 | }, |
316 | ||
2d6d88c6 | 317 | /* Event syscall enter tracing table */ |
49c50022 | 318 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
319 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
320 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
321 | }; |
322 | ||
a93244f8 MD |
323 | #undef TRACE_SYSCALL_TABLE |
324 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
325 | [ _nr ] = { \ | |
2d6d88c6 | 326 | .event_func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 327 | .nrargs = (_nrargs), \ |
d4291869 MD |
328 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
329 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
330 | }, |
331 | ||
2d6d88c6 | 332 | /* Event compat syscall enter table */ |
a93244f8 | 333 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
334 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
335 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 336 | }; |
259b6cb3 | 337 | |
fc4f7161 MD |
338 | #undef SC_ENTER |
339 | ||
340 | #define SC_EXIT | |
341 | ||
342 | #undef sc_exit | |
343 | #define sc_exit(...) __VA_ARGS__ | |
344 | ||
5b7ac358 MD |
345 | #undef TRACE_SYSCALL_TABLE |
346 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
347 | [ _nr ] = { \ | |
2d6d88c6 | 348 | .event_func = __event_probe__syscall_exit_##_template, \ |
5b7ac358 MD |
349 | .nrargs = (_nrargs), \ |
350 | .fields = __event_fields___syscall_exit_##_template, \ | |
351 | .desc = &__event_desc___syscall_exit_##_name, \ | |
352 | }, | |
353 | ||
2d6d88c6 | 354 | /* Event syscall exit table */ |
5b7ac358 | 355 | static const struct trace_syscall_entry sc_exit_table[] = { |
241ae9a8 MD |
356 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
357 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
358 | }; |
359 | ||
360 | #undef TRACE_SYSCALL_TABLE | |
361 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
362 | [ _nr ] = { \ | |
2d6d88c6 | 363 | .event_func = __event_probe__compat_syscall_exit_##_template, \ |
5b7ac358 MD |
364 | .nrargs = (_nrargs), \ |
365 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
366 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
367 | }, | |
368 | ||
2d6d88c6 | 369 | /* Event compat syscall exit table */ |
5b7ac358 | 370 | const struct trace_syscall_entry compat_sc_exit_table[] = { |
241ae9a8 MD |
371 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
372 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
373 | }; |
374 | ||
fc4f7161 MD |
375 | #undef SC_EXIT |
376 | ||
a93244f8 | 377 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 378 | |
80f87dd2 | 379 | struct lttng_syscall_filter { |
badfe9f5 MD |
380 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
381 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
382 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
383 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
384 | }; |
385 | ||
3b82c4e1 | 386 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 387 | struct pt_regs *regs, long id) |
f405cfce | 388 | { |
1b7b9c65 | 389 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 390 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 391 | |
1b7b9c65 | 392 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 393 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 394 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 395 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 396 | else |
e2d5dbc7 | 397 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
398 | } |
399 | } | |
400 | ||
63aa9160 | 401 | static __always_inline |
e2d5dbc7 | 402 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 403 | void *func, unsigned int nrargs, |
63aa9160 | 404 | struct pt_regs *regs) |
259b6cb3 | 405 | { |
a67ba386 | 406 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 407 | |
63aa9160 | 408 | switch (nrargs) { |
259b6cb3 MD |
409 | case 0: |
410 | { | |
63aa9160 | 411 | void (*fptr)(void *__data) = func; |
259b6cb3 | 412 | |
e2d5dbc7 MD |
413 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
414 | fptr(event_priv->pub); | |
259b6cb3 MD |
415 | break; |
416 | } | |
417 | case 1: | |
418 | { | |
63aa9160 | 419 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 420 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 421 | |
1b7b9c65 | 422 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
423 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
424 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
425 | break; |
426 | } | |
427 | case 2: | |
428 | { | |
429 | void (*fptr)(void *__data, | |
430 | unsigned long arg0, | |
63aa9160 | 431 | unsigned long arg1) = func; |
1b7b9c65 | 432 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 433 | |
1b7b9c65 | 434 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
435 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
436 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
437 | break; |
438 | } | |
439 | case 3: | |
440 | { | |
441 | void (*fptr)(void *__data, | |
442 | unsigned long arg0, | |
443 | unsigned long arg1, | |
63aa9160 | 444 | unsigned long arg2) = func; |
1b7b9c65 | 445 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 446 | |
1b7b9c65 | 447 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
448 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
449 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
450 | break; |
451 | } | |
452 | case 4: | |
453 | { | |
454 | void (*fptr)(void *__data, | |
455 | unsigned long arg0, | |
456 | unsigned long arg1, | |
457 | unsigned long arg2, | |
63aa9160 | 458 | unsigned long arg3) = func; |
1b7b9c65 | 459 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 460 | |
1b7b9c65 | 461 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
462 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
463 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
464 | break; |
465 | } | |
466 | case 5: | |
467 | { | |
468 | void (*fptr)(void *__data, | |
469 | unsigned long arg0, | |
470 | unsigned long arg1, | |
471 | unsigned long arg2, | |
472 | unsigned long arg3, | |
63aa9160 | 473 | unsigned long arg4) = func; |
1b7b9c65 | 474 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 475 | |
1b7b9c65 | 476 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
477 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
478 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
479 | break; |
480 | } | |
481 | case 6: | |
482 | { | |
483 | void (*fptr)(void *__data, | |
484 | unsigned long arg0, | |
485 | unsigned long arg1, | |
486 | unsigned long arg2, | |
487 | unsigned long arg3, | |
488 | unsigned long arg4, | |
63aa9160 | 489 | unsigned long arg5) = func; |
1b7b9c65 | 490 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 491 | |
1b7b9c65 | 492 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
493 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
494 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 495 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
496 | break; |
497 | } | |
498 | default: | |
499 | break; | |
500 | } | |
501 | } | |
502 | ||
63aa9160 FD |
503 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
504 | { | |
505 | struct lttng_channel *chan = __data; | |
3b82c4e1 | 506 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
507 | const struct trace_syscall_entry *table, *entry; |
508 | size_t table_len; | |
509 | ||
510 | if (unlikely(in_compat_syscall())) { | |
511 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
512 | ||
513 | if (id < 0 || id >= NR_compat_syscalls | |
3b82c4e1 | 514 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
515 | /* System call filtered out. */ |
516 | return; | |
517 | } | |
518 | table = compat_sc_table; | |
519 | table_len = ARRAY_SIZE(compat_sc_table); | |
3b82c4e1 | 520 | unknown_action_list = &chan->sc_compat_unknown; |
63aa9160 FD |
521 | } else { |
522 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
523 | ||
524 | if (id < 0 || id >= NR_syscalls | |
3b82c4e1 | 525 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
526 | /* System call filtered out. */ |
527 | return; | |
528 | } | |
529 | table = sc_table; | |
530 | table_len = ARRAY_SIZE(sc_table); | |
3b82c4e1 | 531 | unknown_action_list = &chan->sc_unknown; |
63aa9160 FD |
532 | } |
533 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 534 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
535 | return; |
536 | } | |
3b82c4e1 MD |
537 | |
538 | entry = &table[id]; | |
539 | if (!entry->event_func) { | |
540 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
541 | return; |
542 | } | |
3b82c4e1 MD |
543 | |
544 | if (unlikely(in_compat_syscall())) { | |
545 | action_list = &chan->compat_sc_table[id]; | |
546 | } else { | |
547 | action_list = &chan->sc_table[id]; | |
548 | } | |
549 | if (unlikely(hlist_empty(action_list))) | |
550 | return; | |
551 | ||
e2d5dbc7 | 552 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
553 | } |
554 | ||
8a8ac9a8 FD |
555 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
556 | long id) | |
557 | { | |
558 | struct lttng_event_notifier_group *group = __data; | |
559 | const struct trace_syscall_entry *table, *entry; | |
560 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
561 | size_t table_len; | |
562 | ||
563 | if (unlikely(in_compat_syscall())) { | |
564 | struct lttng_syscall_filter *filter = group->sc_filter; | |
565 | ||
566 | if (id < 0 || id >= NR_compat_syscalls | |
567 | || (!READ_ONCE(group->syscall_all_entry) && | |
568 | !test_bit(id, filter->sc_compat_entry))) { | |
569 | /* System call filtered out. */ | |
570 | return; | |
571 | } | |
572 | table = compat_sc_table; | |
573 | table_len = ARRAY_SIZE(compat_sc_table); | |
574 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
575 | } else { | |
576 | struct lttng_syscall_filter *filter = group->sc_filter; | |
577 | ||
578 | if (id < 0 || id >= NR_syscalls | |
579 | || (!READ_ONCE(group->syscall_all_entry) && | |
580 | !test_bit(id, filter->sc_entry))) { | |
581 | /* System call filtered out. */ | |
582 | return; | |
583 | } | |
584 | table = sc_table; | |
585 | table_len = ARRAY_SIZE(sc_table); | |
586 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
587 | } | |
588 | /* Check if the syscall id is out of bound. */ | |
589 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 590 | syscall_entry_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
591 | regs, id); |
592 | return; | |
593 | } | |
594 | ||
595 | entry = &table[id]; | |
e2d5dbc7 MD |
596 | if (!entry->event_func) { |
597 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
598 | regs, id); |
599 | return; | |
600 | } | |
601 | ||
602 | if (unlikely(in_compat_syscall())) { | |
603 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
604 | } else { | |
605 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
606 | } | |
607 | if (unlikely(hlist_empty(dispatch_list))) | |
608 | return; | |
609 | ||
e2d5dbc7 MD |
610 | syscall_entry_event_call_func(dispatch_list, |
611 | entry->event_func, entry->nrargs, regs); | |
8a8ac9a8 FD |
612 | } |
613 | ||
3b82c4e1 | 614 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 615 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 616 | { |
1b7b9c65 | 617 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 618 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 619 | |
1b7b9c65 | 620 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 621 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 622 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 623 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
624 | args); |
625 | else | |
e2d5dbc7 | 626 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 627 | } |
5b7ac358 MD |
628 | } |
629 | ||
3b82c4e1 | 630 | static __always_inline |
e2d5dbc7 | 631 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
632 | void *func, unsigned int nrargs, |
633 | struct pt_regs *regs, long ret) | |
5b7ac358 | 634 | { |
a67ba386 | 635 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 636 | |
3b82c4e1 | 637 | switch (nrargs) { |
5b7ac358 MD |
638 | case 0: |
639 | { | |
3b82c4e1 | 640 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 641 | |
e2d5dbc7 MD |
642 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
643 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
644 | break; |
645 | } | |
646 | case 1: | |
647 | { | |
648 | void (*fptr)(void *__data, | |
fc4f7161 | 649 | long ret, |
3b82c4e1 | 650 | unsigned long arg0) = func; |
1b7b9c65 | 651 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 652 | |
1b7b9c65 | 653 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
654 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
655 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
656 | break; |
657 | } | |
658 | case 2: | |
659 | { | |
660 | void (*fptr)(void *__data, | |
fc4f7161 | 661 | long ret, |
5b7ac358 | 662 | unsigned long arg0, |
3b82c4e1 | 663 | unsigned long arg1) = func; |
1b7b9c65 | 664 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 665 | |
1b7b9c65 | 666 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
667 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
668 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
669 | break; |
670 | } | |
671 | case 3: | |
672 | { | |
673 | void (*fptr)(void *__data, | |
fc4f7161 | 674 | long ret, |
5b7ac358 MD |
675 | unsigned long arg0, |
676 | unsigned long arg1, | |
3b82c4e1 | 677 | unsigned long arg2) = func; |
1b7b9c65 | 678 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 679 | |
1b7b9c65 | 680 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
681 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
682 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
683 | break; |
684 | } | |
685 | case 4: | |
686 | { | |
687 | void (*fptr)(void *__data, | |
fc4f7161 | 688 | long ret, |
5b7ac358 MD |
689 | unsigned long arg0, |
690 | unsigned long arg1, | |
691 | unsigned long arg2, | |
3b82c4e1 | 692 | unsigned long arg3) = func; |
1b7b9c65 | 693 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 694 | |
1b7b9c65 | 695 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
696 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
697 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
698 | break; |
699 | } | |
700 | case 5: | |
701 | { | |
702 | void (*fptr)(void *__data, | |
fc4f7161 | 703 | long ret, |
5b7ac358 MD |
704 | unsigned long arg0, |
705 | unsigned long arg1, | |
706 | unsigned long arg2, | |
707 | unsigned long arg3, | |
3b82c4e1 | 708 | unsigned long arg4) = func; |
1b7b9c65 | 709 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 710 | |
1b7b9c65 | 711 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
712 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
713 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
714 | break; |
715 | } | |
716 | case 6: | |
717 | { | |
718 | void (*fptr)(void *__data, | |
fc4f7161 | 719 | long ret, |
5b7ac358 MD |
720 | unsigned long arg0, |
721 | unsigned long arg1, | |
722 | unsigned long arg2, | |
723 | unsigned long arg3, | |
724 | unsigned long arg4, | |
3b82c4e1 | 725 | unsigned long arg5) = func; |
1b7b9c65 | 726 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 727 | |
1b7b9c65 | 728 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
729 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
730 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 731 | args[3], args[4], args[5]); |
5b7ac358 MD |
732 | break; |
733 | } | |
734 | default: | |
735 | break; | |
736 | } | |
737 | } | |
738 | ||
3b82c4e1 MD |
739 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
740 | { | |
741 | struct lttng_channel *chan = __data; | |
742 | struct hlist_head *action_list, *unknown_action_list; | |
743 | const struct trace_syscall_entry *table, *entry; | |
744 | size_t table_len; | |
745 | long id; | |
746 | ||
747 | id = syscall_get_nr(current, regs); | |
748 | ||
749 | if (unlikely(in_compat_syscall())) { | |
750 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
751 | ||
752 | if (id < 0 || id >= NR_compat_syscalls | |
753 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { | |
754 | /* System call filtered out. */ | |
755 | return; | |
756 | } | |
757 | table = compat_sc_exit_table; | |
758 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
759 | unknown_action_list = &chan->compat_sc_exit_unknown; | |
760 | } else { | |
761 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
762 | ||
763 | if (id < 0 || id >= NR_syscalls | |
764 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { | |
765 | /* System call filtered out. */ | |
766 | return; | |
767 | } | |
768 | table = sc_exit_table; | |
769 | table_len = ARRAY_SIZE(sc_exit_table); | |
770 | unknown_action_list = &chan->sc_exit_unknown; | |
771 | } | |
772 | if (unlikely(id < 0 || id >= table_len)) { | |
773 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
774 | return; | |
775 | } | |
776 | ||
777 | entry = &table[id]; | |
778 | if (!entry->event_func) { | |
779 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
780 | return; | |
781 | } | |
782 | ||
783 | if (unlikely(in_compat_syscall())) { | |
784 | action_list = &chan->compat_sc_exit_table[id]; | |
785 | } else { | |
786 | action_list = &chan->sc_exit_table[id]; | |
787 | } | |
788 | if (unlikely(hlist_empty(action_list))) | |
789 | return; | |
790 | ||
e2d5dbc7 | 791 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
792 | regs, ret); |
793 | } | |
794 | ||
8a8ac9a8 FD |
795 | static |
796 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, | |
797 | long ret) | |
798 | { | |
799 | struct lttng_event_notifier_group *group = __data; | |
800 | const struct trace_syscall_entry *table, *entry; | |
801 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
802 | size_t table_len; | |
803 | long id; | |
804 | ||
805 | id = syscall_get_nr(current, regs); | |
806 | ||
807 | if (unlikely(in_compat_syscall())) { | |
808 | struct lttng_syscall_filter *filter = group->sc_filter; | |
809 | ||
810 | if (id < 0 || id >= NR_compat_syscalls | |
811 | || (!READ_ONCE(group->syscall_all_exit) && | |
812 | !test_bit(id, filter->sc_compat_exit))) { | |
813 | /* System call filtered out. */ | |
814 | return; | |
815 | } | |
816 | table = compat_sc_exit_table; | |
817 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
818 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
819 | } else { | |
820 | struct lttng_syscall_filter *filter = group->sc_filter; | |
821 | ||
822 | if (id < 0 || id >= NR_syscalls | |
823 | || (!READ_ONCE(group->syscall_all_exit) && | |
824 | !test_bit(id, filter->sc_exit))) { | |
825 | /* System call filtered out. */ | |
826 | return; | |
827 | } | |
828 | table = sc_exit_table; | |
829 | table_len = ARRAY_SIZE(sc_exit_table); | |
830 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
831 | } | |
832 | /* Check if the syscall id is out of bound. */ | |
833 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 834 | syscall_exit_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
835 | regs, id, ret); |
836 | return; | |
837 | } | |
838 | ||
839 | entry = &table[id]; | |
e2d5dbc7 MD |
840 | if (!entry->event_func) { |
841 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
842 | regs, id); |
843 | return; | |
844 | } | |
845 | ||
846 | if (unlikely(in_compat_syscall())) { | |
847 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
848 | } else { | |
849 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
850 | } | |
851 | if (unlikely(hlist_empty(dispatch_list))) | |
852 | return; | |
853 | ||
e2d5dbc7 MD |
854 | syscall_exit_event_call_func(dispatch_list, |
855 | entry->event_func, entry->nrargs, regs, ret); | |
8a8ac9a8 | 856 | } |
33a39a3c MD |
857 | /* |
858 | * noinline to diminish caller stack size. | |
859 | * Should be called with sessions lock held. | |
860 | */ | |
49c50022 | 861 | static |
3b82c4e1 MD |
862 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
863 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
a67ba386 | 864 | enum sc_type type) |
259b6cb3 | 865 | { |
3b82c4e1 MD |
866 | struct lttng_channel *chan = event_enabler->chan; |
867 | struct lttng_session *session = chan->session; | |
259b6cb3 | 868 | unsigned int i; |
49c50022 | 869 | |
3b82c4e1 | 870 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 871 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 872 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
606828e4 | 873 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
874 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
875 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
876 | struct hlist_head *head; |
877 | bool found = false; | |
49c50022 MD |
878 | |
879 | if (!desc) { | |
880 | /* Unknown syscall */ | |
881 | continue; | |
882 | } | |
3b82c4e1 MD |
883 | if (lttng_desc_match_enabler(desc, |
884 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
885 | continue; | |
49c50022 | 886 | /* |
3b82c4e1 | 887 | * Check if already created. |
49c50022 | 888 | */ |
3b82c4e1 MD |
889 | head = utils_borrow_hash_table_bucket( |
890 | session->events_ht.table, LTTNG_EVENT_HT_SIZE, | |
437d5aa5 | 891 | desc->event_name); |
a67ba386 MD |
892 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
893 | if (event_recorder_priv->parent.desc == desc | |
894 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3b82c4e1 MD |
895 | found = true; |
896 | } | |
897 | if (found) | |
49c50022 | 898 | continue; |
3b82c4e1 MD |
899 | |
900 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 901 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
902 | switch (type) { |
903 | case SC_TYPE_ENTRY: | |
606828e4 MD |
904 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
905 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
906 | break; |
907 | case SC_TYPE_EXIT: | |
606828e4 MD |
908 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
909 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
910 | break; |
911 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
912 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
913 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
914 | break; |
915 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
916 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
917 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
918 | break; |
919 | } | |
606828e4 MD |
920 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
921 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
922 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
a67ba386 MD |
923 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, ev.instrumentation); |
924 | WARN_ON_ONCE(!event_recorder); | |
925 | if (IS_ERR(event_recorder)) { | |
49c50022 MD |
926 | /* |
927 | * If something goes wrong in event registration | |
928 | * after the first one, we have no choice but to | |
929 | * leave the previous events in there, until | |
930 | * deleted by session teardown. | |
931 | */ | |
a67ba386 | 932 | return PTR_ERR(event_recorder); |
49c50022 | 933 | } |
a67ba386 | 934 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
935 | } |
936 | return 0; | |
937 | } | |
938 | ||
33a39a3c MD |
939 | /* |
940 | * Should be called with sessions lock held. | |
941 | */ | |
a67ba386 | 942 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler) |
49c50022 | 943 | { |
3b82c4e1 | 944 | struct lttng_channel *chan = event_enabler->chan; |
606828e4 | 945 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
946 | int ret; |
947 | ||
263b6c88 | 948 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
949 | |
950 | if (!chan->sc_table) { | |
951 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 952 | chan->sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
259b6cb3 MD |
953 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
954 | if (!chan->sc_table) | |
955 | return -ENOMEM; | |
956 | } | |
5b7ac358 MD |
957 | if (!chan->sc_exit_table) { |
958 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 959 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
5b7ac358 MD |
960 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); |
961 | if (!chan->sc_exit_table) | |
962 | return -ENOMEM; | |
963 | } | |
964 | ||
259b6cb3 | 965 | |
49c50022 MD |
966 | #ifdef CONFIG_COMPAT |
967 | if (!chan->compat_sc_table) { | |
968 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 969 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
a93244f8 | 970 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
971 | if (!chan->compat_sc_table) |
972 | return -ENOMEM; | |
973 | } | |
5b7ac358 MD |
974 | |
975 | if (!chan->compat_sc_exit_table) { | |
976 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 977 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
5b7ac358 MD |
978 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); |
979 | if (!chan->compat_sc_exit_table) | |
980 | return -ENOMEM; | |
981 | } | |
49c50022 | 982 | #endif |
3b82c4e1 | 983 | if (hlist_empty(&chan->sc_unknown)) { |
437d5aa5 | 984 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 985 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 986 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a | 987 | |
f405cfce | 988 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
989 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
990 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
991 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
992 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
993 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 994 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 995 | ev.instrumentation); |
a67ba386 MD |
996 | WARN_ON_ONCE(!event_recorder); |
997 | if (IS_ERR(event_recorder)) { | |
998 | return PTR_ERR(event_recorder); | |
f405cfce | 999 | } |
a67ba386 | 1000 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_unknown); |
f405cfce MD |
1001 | } |
1002 | ||
3b82c4e1 | 1003 | if (hlist_empty(&chan->sc_compat_unknown)) { |
437d5aa5 | 1004 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 1005 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 1006 | struct lttng_kernel_event_recorder *event_recorder; |
b76dc1a0 MD |
1007 | |
1008 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1009 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1010 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1011 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1012 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
1013 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 1014 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1015 | ev.instrumentation); |
a67ba386 MD |
1016 | WARN_ON_ONCE(!event_recorder); |
1017 | if (IS_ERR(event_recorder)) { | |
1018 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 1019 | } |
a67ba386 | 1020 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_compat_unknown); |
b76dc1a0 MD |
1021 | } |
1022 | ||
3b82c4e1 | 1023 | if (hlist_empty(&chan->compat_sc_exit_unknown)) { |
437d5aa5 | 1024 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 1025 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 1026 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a MD |
1027 | |
1028 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1029 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1030 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1031 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1032 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
1033 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 1034 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1035 | ev.instrumentation); |
a67ba386 MD |
1036 | WARN_ON_ONCE(!event_recorder); |
1037 | if (IS_ERR(event_recorder)) { | |
1038 | return PTR_ERR(event_recorder); | |
5b7ac358 | 1039 | } |
a67ba386 | 1040 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->compat_sc_exit_unknown); |
5b7ac358 MD |
1041 | } |
1042 | ||
3b82c4e1 | 1043 | if (hlist_empty(&chan->sc_exit_unknown)) { |
437d5aa5 | 1044 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 1045 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 1046 | struct lttng_kernel_event_recorder *event_recorder; |
5b7ac358 MD |
1047 | |
1048 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
1049 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
1050 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1051 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1052 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
1053 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 1054 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 1055 | ev.instrumentation); |
a67ba386 MD |
1056 | WARN_ON_ONCE(!event_recorder); |
1057 | if (IS_ERR(event_recorder)) { | |
1058 | return PTR_ERR(event_recorder); | |
2f804c0a | 1059 | } |
a67ba386 | 1060 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_exit_unknown); |
2f804c0a MD |
1061 | } |
1062 | ||
3b82c4e1 | 1063 | ret = lttng_create_syscall_event_if_missing(sc_table, ARRAY_SIZE(sc_table), |
a67ba386 | 1064 | chan->sc_table, event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
1065 | if (ret) |
1066 | return ret; | |
3b82c4e1 | 1067 | ret = lttng_create_syscall_event_if_missing(sc_exit_table, ARRAY_SIZE(sc_exit_table), |
a67ba386 | 1068 | chan->sc_exit_table, event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
1069 | if (ret) |
1070 | return ret; | |
5b7ac358 | 1071 | |
49c50022 | 1072 | #ifdef CONFIG_COMPAT |
3b82c4e1 | 1073 | ret = lttng_create_syscall_event_if_missing(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
a67ba386 | 1074 | chan->compat_sc_table, event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
1075 | if (ret) |
1076 | return ret; | |
3b82c4e1 | 1077 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
a67ba386 | 1078 | chan->compat_sc_exit_table, event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
1079 | if (ret) |
1080 | return ret; | |
1081 | #endif | |
badfe9f5 MD |
1082 | |
1083 | if (!chan->sc_filter) { | |
1084 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1085 | GFP_KERNEL); | |
1086 | if (!chan->sc_filter) | |
1087 | return -ENOMEM; | |
1088 | } | |
1089 | ||
80f87dd2 MD |
1090 | if (!chan->sys_enter_registered) { |
1091 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 1092 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1093 | if (ret) |
1094 | return ret; | |
1095 | chan->sys_enter_registered = 1; | |
1096 | } | |
63728b02 MD |
1097 | /* |
1098 | * We change the name of sys_exit tracepoint due to namespace | |
1099 | * conflict with sys_exit syscall entry. | |
1100 | */ | |
80f87dd2 MD |
1101 | if (!chan->sys_exit_registered) { |
1102 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 1103 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1104 | if (ret) { |
1105 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 1106 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
1107 | return ret; |
1108 | } | |
1109 | chan->sys_exit_registered = 1; | |
63728b02 | 1110 | } |
259b6cb3 MD |
1111 | return ret; |
1112 | } | |
1113 | ||
1114 | /* | |
8a8ac9a8 FD |
1115 | * Should be called with sessions lock held. |
1116 | */ | |
1117 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 1118 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
1119 | { |
1120 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
1121 | unsigned int i; | |
1122 | int ret = 0; | |
1123 | ||
1124 | wrapper_vmalloc_sync_mappings(); | |
1125 | ||
1126 | if (!group->event_notifier_syscall_dispatch) { | |
1127 | group->event_notifier_syscall_dispatch = | |
1128 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1129 | GFP_KERNEL); | |
1130 | if (!group->event_notifier_syscall_dispatch) | |
1131 | return -ENOMEM; | |
1132 | ||
1133 | /* Initialize all list_head */ | |
1134 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1135 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); | |
1136 | ||
1137 | /* Init the unknown syscall notifier list. */ | |
1138 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
1139 | } | |
1140 | ||
1141 | if (!group->event_notifier_exit_syscall_dispatch) { | |
1142 | group->event_notifier_exit_syscall_dispatch = | |
1143 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table), | |
1144 | GFP_KERNEL); | |
1145 | if (!group->event_notifier_exit_syscall_dispatch) | |
1146 | return -ENOMEM; | |
1147 | ||
1148 | /* Initialize all list_head */ | |
1149 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
1150 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); | |
1151 | ||
1152 | /* Init the unknown exit syscall notifier list. */ | |
1153 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
1154 | } | |
1155 | ||
1156 | #ifdef CONFIG_COMPAT | |
1157 | if (!group->event_notifier_compat_syscall_dispatch) { | |
1158 | group->event_notifier_compat_syscall_dispatch = | |
1159 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_table), | |
1160 | GFP_KERNEL); | |
1161 | if (!group->event_notifier_syscall_dispatch) | |
1162 | return -ENOMEM; | |
1163 | ||
1164 | /* Initialize all list_head */ | |
1165 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) | |
1166 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); | |
1167 | ||
1168 | /* Init the unknown syscall notifier list. */ | |
1169 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
1170 | } | |
1171 | ||
1172 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
1173 | group->event_notifier_exit_compat_syscall_dispatch = | |
1174 | kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_exit_table), | |
1175 | GFP_KERNEL); | |
1176 | if (!group->event_notifier_exit_syscall_dispatch) | |
1177 | return -ENOMEM; | |
1178 | ||
1179 | /* Initialize all list_head */ | |
1180 | for (i = 0; i < ARRAY_SIZE(compat_sc_exit_table); i++) | |
1181 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); | |
1182 | ||
1183 | /* Init the unknown exit syscall notifier list. */ | |
1184 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
1185 | } | |
1186 | #endif | |
1187 | ||
1188 | if (!group->sc_filter) { | |
1189 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1190 | GFP_KERNEL); | |
1191 | if (!group->sc_filter) | |
1192 | return -ENOMEM; | |
1193 | } | |
1194 | ||
1195 | if (!group->sys_enter_registered) { | |
1196 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
1197 | (void *) syscall_entry_event_notifier_probe, group); | |
1198 | if (ret) | |
1199 | return ret; | |
1200 | group->sys_enter_registered = 1; | |
1201 | } | |
1202 | ||
1203 | if (!group->sys_exit_registered) { | |
1204 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
1205 | (void *) syscall_exit_event_notifier_probe, group); | |
1206 | if (ret) { | |
1207 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1208 | (void *) syscall_entry_event_notifier_probe, group)); | |
1209 | return ret; | |
1210 | } | |
1211 | group->sys_exit_registered = 1; | |
1212 | } | |
1213 | ||
1214 | return ret; | |
1215 | } | |
1216 | ||
1217 | static | |
1218 | int create_unknown_event_notifier( | |
1219 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1220 | enum sc_type type) | |
1221 | { | |
a67ba386 MD |
1222 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1223 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 1224 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1225 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
606828e4 | 1226 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 | 1227 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1228 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1229 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
1230 | event_notifier_enabler); | |
1231 | struct hlist_head *unknown_dispatch_list; | |
1232 | int ret = 0; | |
1233 | bool found = false; | |
606828e4 MD |
1234 | enum lttng_kernel_abi_syscall_abi abi; |
1235 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
1236 | struct hlist_head *head; |
1237 | ||
1238 | switch (type) { | |
1239 | case SC_TYPE_ENTRY: | |
1240 | desc = &__event_desc___syscall_entry_unknown; | |
1241 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
606828e4 MD |
1242 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1243 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1244 | break; |
1245 | case SC_TYPE_EXIT: | |
1246 | desc = &__event_desc___syscall_exit_unknown; | |
1247 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
606828e4 MD |
1248 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1249 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1250 | break; |
1251 | case SC_TYPE_COMPAT_ENTRY: | |
1252 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1253 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1254 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1255 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1256 | break; |
1257 | case SC_TYPE_COMPAT_EXIT: | |
1258 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1259 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1260 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1261 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1262 | break; |
1263 | default: | |
1264 | BUG_ON(1); | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * Check if already created. | |
1269 | */ | |
1270 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1271 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1272 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1273 | if (event_notifier_priv->parent.desc == desc && | |
1274 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
1275 | found = true; |
1276 | } | |
1277 | if (found) | |
1278 | goto end; | |
1279 | ||
1280 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 1281 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 1282 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 1283 | |
606828e4 | 1284 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 1285 | |
606828e4 | 1286 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
1287 | event_notifier_param.event.u.syscall.abi = abi; |
1288 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1289 | ||
a67ba386 MD |
1290 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1291 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 1292 | event_notifier_param.event.instrumentation); |
a67ba386 | 1293 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 1294 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 1295 | desc->event_name); |
8a8ac9a8 FD |
1296 | ret = -ENOMEM; |
1297 | goto end; | |
1298 | } | |
1299 | ||
a67ba386 | 1300 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
1301 | |
1302 | end: | |
1303 | return ret; | |
1304 | } | |
1305 | ||
1306 | static int create_matching_event_notifiers( | |
1307 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 1308 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
1309 | size_t table_len, enum sc_type type) |
1310 | { | |
1311 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 1312 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1313 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1314 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1315 | unsigned int i; |
1316 | int ret = 0; | |
1317 | ||
1318 | /* iterate over all syscall and create event_notifier that match */ | |
1319 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
1320 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1321 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 1322 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
1323 | struct hlist_head *head; |
1324 | int found = 0; | |
1325 | ||
1326 | desc = table[i].desc; | |
1327 | if (!desc) { | |
1328 | /* Unknown syscall */ | |
1329 | continue; | |
1330 | } | |
1331 | ||
1332 | if (!lttng_desc_match_enabler(desc, | |
1333 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1334 | continue; | |
1335 | ||
1336 | /* | |
1337 | * Check if already created. | |
1338 | */ | |
1339 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1340 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1341 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1342 | if (event_notifier_priv->parent.desc == desc | |
1343 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
8a8ac9a8 FD |
1344 | found = 1; |
1345 | } | |
1346 | if (found) | |
1347 | continue; | |
1348 | ||
1349 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1350 | switch (type) { | |
1351 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1352 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1353 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1354 | break; |
1355 | case SC_TYPE_EXIT: | |
606828e4 MD |
1356 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1357 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1358 | break; |
1359 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1360 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1361 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1362 | break; |
1363 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1364 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1365 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1366 | break; |
1367 | } | |
437d5aa5 | 1368 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1369 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1370 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1371 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1372 | |
99f52fcc FD |
1373 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1374 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1375 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1376 | if (IS_ERR(event_notifier)) { |
1377 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1378 | desc->event_name); |
8a8ac9a8 FD |
1379 | ret = -ENOMEM; |
1380 | goto end; | |
1381 | } | |
1382 | ||
a67ba386 | 1383 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1384 | } |
1385 | ||
1386 | end: | |
1387 | return ret; | |
1388 | ||
1389 | } | |
1390 | ||
a67ba386 MD |
1391 | int lttng_syscalls_create_matching_event_notifiers( |
1392 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1393 | { |
1394 | int ret; | |
1395 | struct lttng_enabler *base_enabler = | |
1396 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
606828e4 | 1397 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1398 | base_enabler->event_param.u.syscall.entryexit; |
1399 | ||
606828e4 | 1400 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1401 | ret = create_matching_event_notifiers(event_notifier_enabler, |
a67ba386 | 1402 | sc_table, ARRAY_SIZE(sc_table), SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1403 | if (ret) |
1404 | goto end; | |
1405 | ||
1406 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
a67ba386 | 1407 | compat_sc_table, ARRAY_SIZE(compat_sc_table), |
8a8ac9a8 FD |
1408 | SC_TYPE_COMPAT_ENTRY); |
1409 | if (ret) | |
1410 | goto end; | |
1411 | ||
1412 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1413 | SC_TYPE_ENTRY); | |
1414 | if (ret) | |
1415 | goto end; | |
1416 | ||
1417 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1418 | SC_TYPE_COMPAT_ENTRY); | |
1419 | if (ret) | |
1420 | goto end; | |
1421 | } | |
1422 | ||
606828e4 | 1423 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1424 | ret = create_matching_event_notifiers(event_notifier_enabler, |
a67ba386 | 1425 | sc_exit_table, ARRAY_SIZE(sc_exit_table), |
8a8ac9a8 FD |
1426 | SC_TYPE_EXIT); |
1427 | if (ret) | |
1428 | goto end; | |
1429 | ||
1430 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1431 | SC_TYPE_EXIT); | |
1432 | if (ret) | |
1433 | goto end; | |
1434 | ||
1435 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
a67ba386 | 1436 | compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
8a8ac9a8 FD |
1437 | SC_TYPE_COMPAT_EXIT); |
1438 | if (ret) | |
1439 | goto end; | |
1440 | ||
1441 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1442 | SC_TYPE_COMPAT_EXIT); | |
1443 | if (ret) | |
1444 | goto end; | |
1445 | } | |
1446 | ||
1447 | end: | |
1448 | return ret; | |
1449 | } | |
1450 | ||
1451 | /* | |
1452 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1453 | */ |
3b82c4e1 | 1454 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1455 | struct lttng_event_notifier_group *event_notifier_group) |
1456 | { | |
1457 | int ret; | |
1458 | ||
1459 | /* | |
1460 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1461 | * At the moment, we don't think it's desirable to have one fired | |
1462 | * event_notifier for the entry and one for the exit of a syscall. | |
1463 | */ | |
1464 | if (event_notifier_group->sys_enter_registered) { | |
1465 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1466 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1467 | if (ret) | |
1468 | return ret; | |
1469 | event_notifier_group->sys_enter_registered = 0; | |
1470 | } | |
1471 | if (event_notifier_group->sys_exit_registered) { | |
1472 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1473 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1474 | if (ret) | |
1475 | return ret; | |
1476 | event_notifier_group->sys_enter_registered = 0; | |
1477 | } | |
1478 | ||
1479 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1480 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1481 | #ifdef CONFIG_COMPAT | |
1482 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1483 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1484 | #endif | |
1485 | return 0; | |
1486 | } | |
1487 | ||
3b82c4e1 | 1488 | int lttng_syscalls_unregister_channel(struct lttng_channel *chan) |
259b6cb3 MD |
1489 | { |
1490 | int ret; | |
1491 | ||
1492 | if (!chan->sc_table) | |
1493 | return 0; | |
80f87dd2 | 1494 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1495 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1496 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1497 | if (ret) |
1498 | return ret; | |
1499 | chan->sys_enter_registered = 0; | |
1500 | } | |
1501 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1502 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1503 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1504 | if (ret) |
1505 | return ret; | |
1506 | chan->sys_exit_registered = 0; | |
1507 | } | |
badfe9f5 MD |
1508 | return 0; |
1509 | } | |
1510 | ||
2d6d88c6 | 1511 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 1512 | { |
259b6cb3 | 1513 | kfree(chan->sc_table); |
5b7ac358 | 1514 | kfree(chan->sc_exit_table); |
49c50022 MD |
1515 | #ifdef CONFIG_COMPAT |
1516 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1517 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1518 | #endif |
80f87dd2 MD |
1519 | kfree(chan->sc_filter); |
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | static | |
1524 | int get_syscall_nr(const char *syscall_name) | |
1525 | { | |
1526 | int syscall_nr = -1; | |
1527 | int i; | |
1528 | ||
1529 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
1530 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1531 | const char *it_name; |
80f87dd2 MD |
1532 | |
1533 | entry = &sc_table[i]; | |
1534 | if (!entry->desc) | |
1535 | continue; | |
437d5aa5 | 1536 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1537 | it_name += strlen(SYSCALL_ENTRY_STR); |
1538 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1539 | syscall_nr = i; |
1540 | break; | |
1541 | } | |
1542 | } | |
1543 | return syscall_nr; | |
1544 | } | |
1545 | ||
1546 | static | |
1547 | int get_compat_syscall_nr(const char *syscall_name) | |
1548 | { | |
1549 | int syscall_nr = -1; | |
1550 | int i; | |
1551 | ||
1552 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
1553 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1554 | const char *it_name; |
80f87dd2 MD |
1555 | |
1556 | entry = &compat_sc_table[i]; | |
1557 | if (!entry->desc) | |
1558 | continue; | |
437d5aa5 | 1559 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1560 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1561 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1562 | syscall_nr = i; |
1563 | break; | |
1564 | } | |
1565 | } | |
1566 | return syscall_nr; | |
1567 | } | |
1568 | ||
12e579db MD |
1569 | static |
1570 | uint32_t get_sc_tables_len(void) | |
1571 | { | |
1572 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1573 | } | |
1574 | ||
badfe9f5 | 1575 | static |
ade8a729 FD |
1576 | const char *get_syscall_name(const char *desc_name, |
1577 | enum lttng_syscall_abi abi, | |
1578 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1579 | { |
badfe9f5 | 1580 | size_t prefix_len = 0; |
80f87dd2 | 1581 | |
80f87dd2 | 1582 | |
ade8a729 | 1583 | switch (entryexit) { |
badfe9f5 | 1584 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1585 | switch (abi) { |
badfe9f5 MD |
1586 | case LTTNG_SYSCALL_ABI_NATIVE: |
1587 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1588 | break; | |
1589 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1590 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1591 | break; | |
80f87dd2 | 1592 | } |
badfe9f5 MD |
1593 | break; |
1594 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1595 | switch (abi) { |
badfe9f5 MD |
1596 | case LTTNG_SYSCALL_ABI_NATIVE: |
1597 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1598 | break; | |
1599 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1600 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1601 | break; | |
80f87dd2 | 1602 | } |
badfe9f5 | 1603 | break; |
80f87dd2 | 1604 | } |
badfe9f5 | 1605 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1606 | return desc_name + prefix_len; |
badfe9f5 MD |
1607 | } |
1608 | ||
ade8a729 FD |
1609 | static |
1610 | int lttng_syscall_filter_enable( | |
1611 | struct lttng_syscall_filter *filter, | |
1612 | const char *desc_name, enum lttng_syscall_abi abi, | |
1613 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1614 | { |
badfe9f5 MD |
1615 | const char *syscall_name; |
1616 | unsigned long *bitmap; | |
1617 | int syscall_nr; | |
1618 | ||
ade8a729 | 1619 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1620 | |
ade8a729 | 1621 | switch (abi) { |
badfe9f5 MD |
1622 | case LTTNG_SYSCALL_ABI_NATIVE: |
1623 | syscall_nr = get_syscall_nr(syscall_name); | |
1624 | break; | |
1625 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1626 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1627 | break; | |
1628 | default: | |
1629 | return -EINVAL; | |
80f87dd2 | 1630 | } |
badfe9f5 MD |
1631 | if (syscall_nr < 0) |
1632 | return -ENOENT; | |
1633 | ||
ade8a729 | 1634 | switch (entryexit) { |
badfe9f5 | 1635 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1636 | switch (abi) { |
badfe9f5 MD |
1637 | case LTTNG_SYSCALL_ABI_NATIVE: |
1638 | bitmap = filter->sc_entry; | |
1639 | break; | |
1640 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1641 | bitmap = filter->sc_compat_entry; | |
1642 | break; | |
6d9694d8 MD |
1643 | default: |
1644 | return -EINVAL; | |
80f87dd2 | 1645 | } |
badfe9f5 MD |
1646 | break; |
1647 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1648 | switch (abi) { |
badfe9f5 MD |
1649 | case LTTNG_SYSCALL_ABI_NATIVE: |
1650 | bitmap = filter->sc_exit; | |
1651 | break; | |
1652 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1653 | bitmap = filter->sc_compat_exit; | |
1654 | break; | |
6d9694d8 MD |
1655 | default: |
1656 | return -EINVAL; | |
80f87dd2 | 1657 | } |
badfe9f5 MD |
1658 | break; |
1659 | default: | |
1660 | return -EINVAL; | |
80f87dd2 | 1661 | } |
badfe9f5 MD |
1662 | if (test_bit(syscall_nr, bitmap)) |
1663 | return -EEXIST; | |
1664 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1665 | return 0; |
80f87dd2 MD |
1666 | } |
1667 | ||
8a8ac9a8 | 1668 | int lttng_syscall_filter_enable_event_notifier( |
a67ba386 | 1669 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1670 | { |
a67ba386 MD |
1671 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
1672 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; | |
8a8ac9a8 FD |
1673 | struct hlist_head *dispatch_list; |
1674 | int ret = 0; | |
1675 | ||
a67ba386 | 1676 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
1677 | |
1678 | ret = lttng_syscall_filter_enable(group->sc_filter, | |
a67ba386 MD |
1679 | event_notifier->priv->parent.desc->event_name, |
1680 | event_notifier->priv->parent.u.syscall.abi, | |
1681 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1682 | if (ret) { |
1683 | goto end; | |
1684 | } | |
1685 | ||
a67ba386 | 1686 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 1687 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 1688 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1689 | case LTTNG_SYSCALL_ABI_NATIVE: |
1690 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1691 | break; | |
1692 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1693 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1694 | break; | |
6866b1c7 MJ |
1695 | default: |
1696 | ret = -EINVAL; | |
1697 | goto end; | |
8a8ac9a8 FD |
1698 | } |
1699 | break; | |
1700 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 1701 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1702 | case LTTNG_SYSCALL_ABI_NATIVE: |
1703 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1704 | break; | |
1705 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1706 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1707 | break; | |
6866b1c7 MJ |
1708 | default: |
1709 | ret = -EINVAL; | |
1710 | goto end; | |
8a8ac9a8 FD |
1711 | } |
1712 | break; | |
6866b1c7 MJ |
1713 | default: |
1714 | ret = -EINVAL; | |
1715 | goto end; | |
8a8ac9a8 FD |
1716 | } |
1717 | ||
a67ba386 | 1718 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
1719 | |
1720 | end: | |
1721 | return ret ; | |
1722 | } | |
1723 | ||
ade8a729 FD |
1724 | int lttng_syscall_filter_enable_event( |
1725 | struct lttng_channel *channel, | |
a67ba386 | 1726 | struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 1727 | { |
a67ba386 | 1728 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 FD |
1729 | |
1730 | return lttng_syscall_filter_enable(channel->sc_filter, | |
a67ba386 MD |
1731 | event_recorder->priv->parent.desc->event_name, |
1732 | event_recorder->priv->parent.u.syscall.abi, | |
1733 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1734 | } |
1735 | ||
1736 | static | |
1737 | int lttng_syscall_filter_disable( | |
1738 | struct lttng_syscall_filter *filter, | |
1739 | const char *desc_name, enum lttng_syscall_abi abi, | |
1740 | enum lttng_syscall_entryexit entryexit) | |
1741 | { | |
badfe9f5 MD |
1742 | const char *syscall_name; |
1743 | unsigned long *bitmap; | |
1744 | int syscall_nr; | |
80f87dd2 | 1745 | |
ade8a729 | 1746 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1747 | |
ade8a729 | 1748 | switch (abi) { |
badfe9f5 MD |
1749 | case LTTNG_SYSCALL_ABI_NATIVE: |
1750 | syscall_nr = get_syscall_nr(syscall_name); | |
1751 | break; | |
1752 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1753 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1754 | break; | |
1755 | default: | |
1756 | return -EINVAL; | |
80f87dd2 | 1757 | } |
badfe9f5 MD |
1758 | if (syscall_nr < 0) |
1759 | return -ENOENT; | |
80f87dd2 | 1760 | |
ade8a729 | 1761 | switch (entryexit) { |
badfe9f5 | 1762 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1763 | switch (abi) { |
badfe9f5 MD |
1764 | case LTTNG_SYSCALL_ABI_NATIVE: |
1765 | bitmap = filter->sc_entry; | |
1766 | break; | |
1767 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1768 | bitmap = filter->sc_compat_entry; | |
1769 | break; | |
6d9694d8 MD |
1770 | default: |
1771 | return -EINVAL; | |
80f87dd2 | 1772 | } |
badfe9f5 MD |
1773 | break; |
1774 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1775 | switch (abi) { |
badfe9f5 MD |
1776 | case LTTNG_SYSCALL_ABI_NATIVE: |
1777 | bitmap = filter->sc_exit; | |
1778 | break; | |
1779 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1780 | bitmap = filter->sc_compat_exit; | |
1781 | break; | |
6d9694d8 MD |
1782 | default: |
1783 | return -EINVAL; | |
80f87dd2 | 1784 | } |
badfe9f5 MD |
1785 | break; |
1786 | default: | |
1787 | return -EINVAL; | |
80f87dd2 | 1788 | } |
badfe9f5 MD |
1789 | if (!test_bit(syscall_nr, bitmap)) |
1790 | return -EEXIST; | |
1791 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1792 | |
badfe9f5 | 1793 | return 0; |
259b6cb3 | 1794 | } |
2d2464bd | 1795 | |
8a8ac9a8 | 1796 | int lttng_syscall_filter_disable_event_notifier( |
a67ba386 | 1797 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1798 | { |
a67ba386 | 1799 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
8a8ac9a8 FD |
1800 | int ret; |
1801 | ||
a67ba386 | 1802 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
1803 | |
1804 | ret = lttng_syscall_filter_disable(group->sc_filter, | |
a67ba386 MD |
1805 | event_notifier->priv->parent.desc->event_name, |
1806 | event_notifier->priv->parent.u.syscall.abi, | |
1807 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1808 | WARN_ON_ONCE(ret != 0); |
1809 | ||
a67ba386 | 1810 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
1811 | return 0; |
1812 | } | |
1813 | ||
ade8a729 FD |
1814 | int lttng_syscall_filter_disable_event( |
1815 | struct lttng_channel *channel, | |
a67ba386 | 1816 | struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 FD |
1817 | { |
1818 | return lttng_syscall_filter_disable(channel->sc_filter, | |
a67ba386 MD |
1819 | event_recorder->priv->parent.desc->event_name, |
1820 | event_recorder->priv->parent.u.syscall.abi, | |
1821 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1822 | } |
1823 | ||
2d2464bd MD |
1824 | static |
1825 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1826 | { | |
1827 | const struct trace_syscall_entry *entry; | |
1828 | int iter = 0; | |
1829 | ||
1830 | for (entry = sc_table; | |
1831 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1832 | entry++) { | |
1833 | if (iter++ >= *pos) | |
1834 | return entry; | |
1835 | } | |
1836 | for (entry = compat_sc_table; | |
1837 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1838 | entry++) { | |
1839 | if (iter++ >= *pos) | |
1840 | return entry; | |
1841 | } | |
1842 | /* End of list */ | |
1843 | return NULL; | |
1844 | } | |
1845 | ||
1846 | static | |
1847 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1848 | { | |
1849 | return (void *) syscall_list_get_entry(pos); | |
1850 | } | |
1851 | ||
1852 | static | |
1853 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1854 | { | |
1855 | (*ppos)++; | |
1856 | return (void *) syscall_list_get_entry(ppos); | |
1857 | } | |
1858 | ||
1859 | static | |
1860 | void syscall_list_stop(struct seq_file *m, void *p) | |
1861 | { | |
1862 | } | |
1863 | ||
12e579db MD |
1864 | static |
1865 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1866 | const struct trace_syscall_entry **table, | |
1867 | unsigned int *bitness) | |
1868 | { | |
1869 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1870 | if (bitness) | |
1871 | *bitness = BITS_PER_LONG; | |
1872 | if (table) | |
1873 | *table = sc_table; | |
1874 | return 0; | |
1875 | } | |
1876 | if (!(entry >= compat_sc_table | |
1877 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1878 | return -EINVAL; | |
1879 | } | |
1880 | if (bitness) | |
1881 | *bitness = 32; | |
1882 | if (table) | |
1883 | *table = compat_sc_table; | |
1884 | return 0; | |
1885 | } | |
1886 | ||
2d2464bd MD |
1887 | static |
1888 | int syscall_list_show(struct seq_file *m, void *p) | |
1889 | { | |
1890 | const struct trace_syscall_entry *table, *entry = p; | |
1891 | unsigned int bitness; | |
d4291869 | 1892 | unsigned long index; |
12e579db | 1893 | int ret; |
d4291869 | 1894 | const char *name; |
2d2464bd | 1895 | |
12e579db MD |
1896 | ret = get_sc_table(entry, &table, &bitness); |
1897 | if (ret) | |
1898 | return ret; | |
f4855b46 MD |
1899 | if (!entry->desc) |
1900 | return 0; | |
d4291869 MD |
1901 | if (table == sc_table) { |
1902 | index = entry - table; | |
437d5aa5 | 1903 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 MD |
1904 | } else { |
1905 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
437d5aa5 | 1906 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1907 | } |
12e579db | 1908 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1909 | index, name, bitness); |
2d2464bd MD |
1910 | return 0; |
1911 | } | |
1912 | ||
1913 | static | |
1914 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1915 | .start = syscall_list_start, | |
1916 | .next = syscall_list_next, | |
1917 | .stop = syscall_list_stop, | |
1918 | .show = syscall_list_show, | |
1919 | }; | |
1920 | ||
1921 | static | |
1922 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1923 | { | |
1924 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1925 | } | |
1926 | ||
1927 | const struct file_operations lttng_syscall_list_fops = { | |
1928 | .owner = THIS_MODULE, | |
1929 | .open = lttng_syscall_list_open, | |
1930 | .read = seq_read, | |
1931 | .llseek = seq_lseek, | |
1932 | .release = seq_release, | |
1933 | }; | |
12e579db | 1934 | |
badfe9f5 MD |
1935 | /* |
1936 | * A syscall is enabled if it is traced for either entry or exit. | |
1937 | */ | |
12e579db | 1938 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
606828e4 | 1939 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1940 | { |
1941 | uint32_t len, sc_tables_len, bitmask_len; | |
1942 | int ret = 0, bit; | |
1943 | char *tmp_mask; | |
1944 | struct lttng_syscall_filter *filter; | |
1945 | ||
1946 | ret = get_user(len, &usyscall_mask->len); | |
1947 | if (ret) | |
1948 | return ret; | |
1949 | sc_tables_len = get_sc_tables_len(); | |
1950 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1951 | if (len < sc_tables_len) { | |
1952 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1953 | } | |
1954 | /* Array is large enough, we can copy array to user-space. */ | |
1955 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1956 | if (!tmp_mask) | |
1957 | return -ENOMEM; | |
1958 | filter = channel->sc_filter; | |
1959 | ||
1960 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1961 | char state; |
2f25059d MD |
1962 | |
1963 | if (channel->sc_table) { | |
3b82c4e1 MD |
1964 | if (!(READ_ONCE(channel->syscall_all_entry) |
1965 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1966 | state = test_bit(bit, filter->sc_entry) |
1967 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1968 | else |
1969 | state = 1; | |
1970 | } else { | |
1971 | state = 0; | |
1972 | } | |
1973 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1974 | } |
1975 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1976 | char state; |
2f25059d MD |
1977 | |
1978 | if (channel->compat_sc_table) { | |
3b82c4e1 MD |
1979 | if (!(READ_ONCE(channel->syscall_all_entry) |
1980 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
2f25059d | 1981 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
badfe9f5 MD |
1982 | filter->sc_compat_entry) |
1983 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
1984 | filter->sc_compat_exit); | |
2f25059d MD |
1985 | else |
1986 | state = 1; | |
1987 | } else { | |
1988 | state = 0; | |
1989 | } | |
1990 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1991 | } |
1992 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1993 | ret = -EFAULT; | |
1994 | kfree(tmp_mask); | |
1995 | return ret; | |
1996 | } | |
082d4946 MD |
1997 | |
1998 | int lttng_abi_syscall_list(void) | |
1999 | { | |
2000 | struct file *syscall_list_file; | |
2001 | int file_fd, ret; | |
2002 | ||
4ac10b76 | 2003 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
2004 | if (file_fd < 0) { |
2005 | ret = file_fd; | |
2006 | goto fd_error; | |
2007 | } | |
2008 | ||
2009 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
2010 | <tng_syscall_list_fops, | |
2011 | NULL, O_RDWR); | |
2012 | if (IS_ERR(syscall_list_file)) { | |
2013 | ret = PTR_ERR(syscall_list_file); | |
2014 | goto file_error; | |
2015 | } | |
2016 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
2017 | if (ret < 0) | |
2018 | goto open_error; | |
2019 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
2020 | return file_fd; |
2021 | ||
2022 | open_error: | |
2023 | fput(syscall_list_file); | |
2024 | file_error: | |
2025 | put_unused_fd(file_fd); | |
2026 | fd_error: | |
2027 | return ret; | |
2028 | } |