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> |
259b6cb3 | 32 | |
6333ace3 | 33 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
34 | # ifndef is_compat_task |
35 | # define is_compat_task() (0) | |
36 | # endif | |
6333ace3 MD |
37 | #endif |
38 | ||
1aa3298b MD |
39 | /* in_compat_syscall appears in kernel 4.6. */ |
40 | #ifndef in_compat_syscall | |
41 | #define in_compat_syscall() is_compat_task() | |
42 | #endif | |
43 | ||
5b7ac358 MD |
44 | enum sc_type { |
45 | SC_TYPE_ENTRY, | |
46 | SC_TYPE_EXIT, | |
47 | SC_TYPE_COMPAT_ENTRY, | |
48 | SC_TYPE_COMPAT_EXIT, | |
49 | }; | |
50 | ||
d4291869 MD |
51 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
52 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
53 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
54 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
55 | ||
56 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
57 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
58 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
59 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 60 | |
a93244f8 | 61 | static |
2faf7d1b | 62 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
63 | static |
64 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 65 | |
3a523f5b MD |
66 | /* |
67 | * Forward declarations for old kernels. | |
68 | */ | |
69 | struct mmsghdr; | |
70 | struct rlimit64; | |
71 | struct oldold_utsname; | |
72 | struct old_utsname; | |
73 | struct sel_arg_struct; | |
74 | struct mmap_arg_struct; | |
c0b71117 | 75 | struct file_handle; |
a292e6f1 | 76 | struct user_msghdr; |
3a523f5b | 77 | |
9eb15e8b MJ |
78 | /* |
79 | * Forward declaration for kernels >= 5.6 | |
80 | */ | |
81 | struct timex; | |
edfdcb68 MJ |
82 | struct timeval; |
83 | struct itimerval; | |
84 | struct itimerspec; | |
85 | ||
86 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
87 | typedef __kernel_old_time_t time_t; | |
88 | #endif | |
9eb15e8b | 89 | |
80f87dd2 MD |
90 | #ifdef IA32_NR_syscalls |
91 | #define NR_compat_syscalls IA32_NR_syscalls | |
92 | #else | |
93 | #define NR_compat_syscalls NR_syscalls | |
94 | #endif | |
95 | ||
259b6cb3 MD |
96 | /* |
97 | * Create LTTng tracepoint probes. | |
98 | */ | |
99 | #define LTTNG_PACKAGE_BUILD | |
100 | #define CREATE_TRACE_POINTS | |
2655f9ad | 101 | #define TP_MODULE_NOINIT |
c075712b | 102 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 103 | |
a93244f8 MD |
104 | #define PARAMS(args...) args |
105 | ||
5b7ac358 | 106 | /* Handle unknown syscalls */ |
72a52753 | 107 | #undef TRACE_SYSTEM |
5b7ac358 | 108 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 109 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
110 | #undef TRACE_SYSTEM |
111 | ||
fc4f7161 MD |
112 | #define SC_ENTER |
113 | ||
fc4f7161 MD |
114 | #undef sc_exit |
115 | #define sc_exit(...) | |
b75d00c4 MD |
116 | #undef sc_in |
117 | #define sc_in(...) __VA_ARGS__ | |
118 | #undef sc_out | |
119 | #define sc_out(...) | |
120 | #undef sc_inout | |
121 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
122 | |
123 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 124 | #undef TP_PROBE_CB |
259b6cb3 | 125 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 126 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 127 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 128 | PARAMS(_fields)) |
265822ae | 129 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 130 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
131 | PARAMS(_locvar), PARAMS(_code_pre), \ |
132 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
133 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
134 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 135 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 136 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
137 | /* Enumerations only defined at first inclusion. */ |
138 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
139 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 140 | #undef TRACE_SYSTEM |
d4291869 | 141 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 142 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 143 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 144 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 145 | #undef TRACE_SYSTEM |
d4291869 | 146 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 147 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 148 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 149 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 150 | #undef TRACE_SYSTEM |
141ddf28 | 151 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
152 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
153 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
154 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
155 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 156 | #undef TP_PROBE_CB |
3bc29f0a MD |
157 | #undef _TRACE_SYSCALLS_INTEGERS_H |
158 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
159 | |
160 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 161 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
771af27e | 162 | #define LTTNG_SC_COMPAT |
57ede728 | 163 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 164 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 165 | PARAMS(_fields)) |
265822ae | 166 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 167 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 168 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
169 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
170 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 171 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
172 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
173 | compat_syscall_entry_##_name) | |
141ddf28 MD |
174 | /* Enumerations only defined at inital inclusion (not here). */ |
175 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 176 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 177 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 178 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
179 | #undef TRACE_INCLUDE_FILE |
180 | #undef TRACE_SYSTEM | |
d4291869 | 181 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 182 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 183 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
184 | #undef TRACE_INCLUDE_FILE |
185 | #undef TRACE_SYSTEM | |
141ddf28 | 186 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
187 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
188 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
189 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
190 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 191 | #undef TP_PROBE_CB |
3bc29f0a MD |
192 | #undef _TRACE_SYSCALLS_INTEGERS_H |
193 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 194 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 195 | |
fc4f7161 MD |
196 | #undef SC_ENTER |
197 | ||
198 | #define SC_EXIT | |
199 | ||
fc4f7161 MD |
200 | #undef sc_exit |
201 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
202 | #undef sc_in |
203 | #define sc_in(...) | |
204 | #undef sc_out | |
205 | #define sc_out(...) __VA_ARGS__ | |
206 | #undef sc_inout | |
207 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
208 | |
209 | /* Hijack probe callback for system call exit */ | |
210 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 211 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 212 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 213 | PARAMS(_fields)) |
265822ae | 214 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 215 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 216 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
217 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
218 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
219 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
220 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 221 | syscall_exit_##_name) |
141ddf28 MD |
222 | /* Enumerations only defined at inital inclusion (not here). */ |
223 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
224 | #define TRACE_SYSTEM syscall_exit_integers |
225 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 226 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
227 | #undef TRACE_INCLUDE_FILE |
228 | #undef TRACE_SYSTEM | |
229 | #define TRACE_SYSTEM syscall_exit_pointers | |
230 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 231 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
232 | #undef TRACE_INCLUDE_FILE |
233 | #undef TRACE_SYSTEM | |
141ddf28 | 234 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
235 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
236 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
237 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
238 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 239 | #undef TP_PROBE_CB |
3bc29f0a MD |
240 | #undef _TRACE_SYSCALLS_INTEGERS_H |
241 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
242 | |
243 | ||
244 | /* Hijack probe callback for compat system call exit */ | |
245 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
771af27e | 246 | #define LTTNG_SC_COMPAT |
57ede728 | 247 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 248 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 249 | PARAMS(_fields)) |
265822ae | 250 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 251 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 252 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
253 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
254 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 255 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 256 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 257 | compat_syscall_exit_##_name) |
141ddf28 MD |
258 | /* Enumerations only defined at inital inclusion (not here). */ |
259 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
260 | #define TRACE_SYSTEM compat_syscall_exit_integers |
261 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 262 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 263 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 264 | #undef TRACE_SYSTEM |
5b7ac358 MD |
265 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
266 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 267 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 268 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 269 | #undef TRACE_SYSTEM |
141ddf28 | 270 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
271 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
272 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
273 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
274 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 275 | #undef TP_PROBE_CB |
3bc29f0a MD |
276 | #undef _TRACE_SYSCALLS_INTEGERS_H |
277 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 278 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 279 | |
fc4f7161 | 280 | #undef SC_EXIT |
259b6cb3 | 281 | |
2655f9ad | 282 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
283 | #undef LTTNG_PACKAGE_BUILD |
284 | #undef CREATE_TRACE_POINTS | |
285 | ||
a93244f8 MD |
286 | struct trace_syscall_entry { |
287 | void *func; | |
288 | const struct lttng_event_desc *desc; | |
289 | const struct lttng_event_field *fields; | |
290 | unsigned int nrargs; | |
291 | }; | |
292 | ||
293 | #define CREATE_SYSCALL_TABLE | |
294 | ||
fc4f7161 MD |
295 | #define SC_ENTER |
296 | ||
297 | #undef sc_exit | |
298 | #define sc_exit(...) | |
299 | ||
259b6cb3 | 300 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 301 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 302 | [ _nr ] = { \ |
d4291869 | 303 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 304 | .nrargs = (_nrargs), \ |
d4291869 MD |
305 | .fields = __event_fields___syscall_entry_##_template, \ |
306 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
307 | }, |
308 | ||
5b7ac358 | 309 | /* Syscall enter tracing table */ |
49c50022 | 310 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
311 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
312 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
313 | }; |
314 | ||
a93244f8 MD |
315 | #undef TRACE_SYSCALL_TABLE |
316 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
317 | [ _nr ] = { \ | |
d4291869 | 318 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 319 | .nrargs = (_nrargs), \ |
d4291869 MD |
320 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
321 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
322 | }, |
323 | ||
5b7ac358 | 324 | /* Compat syscall enter table */ |
a93244f8 | 325 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
326 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
327 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 328 | }; |
259b6cb3 | 329 | |
fc4f7161 MD |
330 | #undef SC_ENTER |
331 | ||
332 | #define SC_EXIT | |
333 | ||
334 | #undef sc_exit | |
335 | #define sc_exit(...) __VA_ARGS__ | |
336 | ||
5b7ac358 MD |
337 | #undef TRACE_SYSCALL_TABLE |
338 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
339 | [ _nr ] = { \ | |
340 | .func = __event_probe__syscall_exit_##_template, \ | |
341 | .nrargs = (_nrargs), \ | |
342 | .fields = __event_fields___syscall_exit_##_template, \ | |
343 | .desc = &__event_desc___syscall_exit_##_name, \ | |
344 | }, | |
345 | ||
346 | /* Syscall exit table */ | |
347 | static const struct trace_syscall_entry sc_exit_table[] = { | |
241ae9a8 MD |
348 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
349 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
350 | }; |
351 | ||
352 | #undef TRACE_SYSCALL_TABLE | |
353 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
354 | [ _nr ] = { \ | |
355 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
356 | .nrargs = (_nrargs), \ | |
357 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
358 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
359 | }, | |
360 | ||
361 | /* Compat syscall exit table */ | |
362 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
241ae9a8 MD |
363 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
364 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
365 | }; |
366 | ||
fc4f7161 MD |
367 | #undef SC_EXIT |
368 | ||
a93244f8 | 369 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 370 | |
80f87dd2 MD |
371 | struct lttng_syscall_filter { |
372 | DECLARE_BITMAP(sc, NR_syscalls); | |
373 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
374 | }; | |
375 | ||
a90917c3 | 376 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
377 | struct pt_regs *regs, unsigned int id) |
378 | { | |
1b7b9c65 | 379 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 380 | |
1b7b9c65 | 381 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 382 | if (unlikely(in_compat_syscall())) |
d4291869 | 383 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 384 | else |
d4291869 | 385 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
386 | } |
387 | ||
2faf7d1b | 388 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 389 | { |
a90917c3 MD |
390 | struct lttng_channel *chan = __data; |
391 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
392 | const struct trace_syscall_entry *table, *entry; |
393 | size_t table_len; | |
259b6cb3 | 394 | |
1aa3298b | 395 | if (unlikely(in_compat_syscall())) { |
80f87dd2 MD |
396 | struct lttng_syscall_filter *filter; |
397 | ||
49e2f4c4 | 398 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 399 | if (filter) { |
74f7b56a | 400 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
401 | || !test_bit(id, filter->sc_compat)) { |
402 | /* System call filtered out. */ | |
403 | return; | |
404 | } | |
405 | } | |
49c50022 | 406 | table = compat_sc_table; |
a93244f8 | 407 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
408 | unknown_event = chan->sc_compat_unknown; |
409 | } else { | |
80f87dd2 MD |
410 | struct lttng_syscall_filter *filter; |
411 | ||
49e2f4c4 | 412 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 413 | if (filter) { |
74f7b56a | 414 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
415 | || !test_bit(id, filter->sc)) { |
416 | /* System call filtered out. */ | |
417 | return; | |
418 | } | |
419 | } | |
49c50022 MD |
420 | table = sc_table; |
421 | table_len = ARRAY_SIZE(sc_table); | |
422 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 423 | } |
74f7b56a | 424 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 425 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 426 | return; |
f405cfce | 427 | } |
1aa3298b | 428 | if (unlikely(in_compat_syscall())) |
49c50022 MD |
429 | event = chan->compat_sc_table[id]; |
430 | else | |
431 | event = chan->sc_table[id]; | |
f405cfce | 432 | if (unlikely(!event)) { |
49c50022 | 433 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
434 | return; |
435 | } | |
49c50022 | 436 | entry = &table[id]; |
f405cfce | 437 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
438 | |
439 | switch (entry->nrargs) { | |
440 | case 0: | |
441 | { | |
442 | void (*fptr)(void *__data) = entry->func; | |
443 | ||
444 | fptr(event); | |
445 | break; | |
446 | } | |
447 | case 1: | |
448 | { | |
449 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
1b7b9c65 | 450 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 451 | |
1b7b9c65 | 452 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
453 | fptr(event, args[0]); |
454 | break; | |
455 | } | |
456 | case 2: | |
457 | { | |
458 | void (*fptr)(void *__data, | |
459 | unsigned long arg0, | |
460 | unsigned long arg1) = entry->func; | |
1b7b9c65 | 461 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 462 | |
1b7b9c65 | 463 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
464 | fptr(event, args[0], args[1]); |
465 | break; | |
466 | } | |
467 | case 3: | |
468 | { | |
469 | void (*fptr)(void *__data, | |
470 | unsigned long arg0, | |
471 | unsigned long arg1, | |
472 | unsigned long arg2) = entry->func; | |
1b7b9c65 | 473 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 474 | |
1b7b9c65 | 475 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
476 | fptr(event, args[0], args[1], args[2]); |
477 | break; | |
478 | } | |
479 | case 4: | |
480 | { | |
481 | void (*fptr)(void *__data, | |
482 | unsigned long arg0, | |
483 | unsigned long arg1, | |
484 | unsigned long arg2, | |
485 | unsigned long arg3) = entry->func; | |
1b7b9c65 | 486 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 487 | |
1b7b9c65 | 488 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
489 | fptr(event, args[0], args[1], args[2], args[3]); |
490 | break; | |
491 | } | |
492 | case 5: | |
493 | { | |
494 | void (*fptr)(void *__data, | |
495 | unsigned long arg0, | |
496 | unsigned long arg1, | |
497 | unsigned long arg2, | |
498 | unsigned long arg3, | |
499 | unsigned long arg4) = entry->func; | |
1b7b9c65 | 500 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 501 | |
1b7b9c65 | 502 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
503 | fptr(event, args[0], args[1], args[2], args[3], args[4]); |
504 | break; | |
505 | } | |
506 | case 6: | |
507 | { | |
508 | void (*fptr)(void *__data, | |
509 | unsigned long arg0, | |
510 | unsigned long arg1, | |
511 | unsigned long arg2, | |
512 | unsigned long arg3, | |
513 | unsigned long arg4, | |
514 | unsigned long arg5) = entry->func; | |
1b7b9c65 | 515 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 516 | |
1b7b9c65 | 517 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
518 | fptr(event, args[0], args[1], args[2], |
519 | args[3], args[4], args[5]); | |
520 | break; | |
521 | } | |
522 | default: | |
523 | break; | |
524 | } | |
525 | } | |
526 | ||
5b7ac358 | 527 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 528 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 529 | { |
1b7b9c65 | 530 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 531 | |
1b7b9c65 | 532 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 533 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
534 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
535 | args); | |
536 | else | |
537 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
538 | } | |
539 | ||
540 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
541 | { | |
542 | struct lttng_channel *chan = __data; | |
543 | struct lttng_event *event, *unknown_event; | |
544 | const struct trace_syscall_entry *table, *entry; | |
545 | size_t table_len; | |
546 | long id; | |
547 | ||
548 | id = syscall_get_nr(current, regs); | |
1aa3298b | 549 | if (unlikely(in_compat_syscall())) { |
5b7ac358 MD |
550 | struct lttng_syscall_filter *filter; |
551 | ||
49e2f4c4 | 552 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 553 | if (filter) { |
74f7b56a | 554 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
555 | || !test_bit(id, filter->sc_compat)) { |
556 | /* System call filtered out. */ | |
557 | return; | |
558 | } | |
559 | } | |
560 | table = compat_sc_exit_table; | |
561 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
562 | unknown_event = chan->compat_sc_exit_unknown; | |
563 | } else { | |
564 | struct lttng_syscall_filter *filter; | |
565 | ||
49e2f4c4 | 566 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 567 | if (filter) { |
74f7b56a | 568 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
569 | || !test_bit(id, filter->sc)) { |
570 | /* System call filtered out. */ | |
571 | return; | |
572 | } | |
573 | } | |
574 | table = sc_exit_table; | |
575 | table_len = ARRAY_SIZE(sc_exit_table); | |
576 | unknown_event = chan->sc_exit_unknown; | |
577 | } | |
74f7b56a | 578 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
579 | syscall_exit_unknown(unknown_event, regs, id, ret); |
580 | return; | |
581 | } | |
1aa3298b | 582 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
583 | event = chan->compat_sc_exit_table[id]; |
584 | else | |
585 | event = chan->sc_exit_table[id]; | |
586 | if (unlikely(!event)) { | |
587 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
588 | return; | |
589 | } | |
590 | entry = &table[id]; | |
591 | WARN_ON_ONCE(!entry); | |
592 | ||
593 | switch (entry->nrargs) { | |
594 | case 0: | |
595 | { | |
fc4f7161 | 596 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 597 | |
fc4f7161 | 598 | fptr(event, ret); |
5b7ac358 MD |
599 | break; |
600 | } | |
601 | case 1: | |
602 | { | |
603 | void (*fptr)(void *__data, | |
fc4f7161 | 604 | long ret, |
5b7ac358 | 605 | unsigned long arg0) = entry->func; |
1b7b9c65 | 606 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 607 | |
1b7b9c65 | 608 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 609 | fptr(event, ret, args[0]); |
5b7ac358 MD |
610 | break; |
611 | } | |
612 | case 2: | |
613 | { | |
614 | void (*fptr)(void *__data, | |
fc4f7161 | 615 | long ret, |
5b7ac358 MD |
616 | unsigned long arg0, |
617 | unsigned long arg1) = entry->func; | |
1b7b9c65 | 618 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 619 | |
1b7b9c65 | 620 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 621 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
622 | break; |
623 | } | |
624 | case 3: | |
625 | { | |
626 | void (*fptr)(void *__data, | |
fc4f7161 | 627 | long ret, |
5b7ac358 MD |
628 | unsigned long arg0, |
629 | unsigned long arg1, | |
630 | unsigned long arg2) = entry->func; | |
1b7b9c65 | 631 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 632 | |
1b7b9c65 | 633 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 634 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
635 | break; |
636 | } | |
637 | case 4: | |
638 | { | |
639 | void (*fptr)(void *__data, | |
fc4f7161 | 640 | long ret, |
5b7ac358 MD |
641 | unsigned long arg0, |
642 | unsigned long arg1, | |
643 | unsigned long arg2, | |
644 | unsigned long arg3) = entry->func; | |
1b7b9c65 | 645 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 646 | |
1b7b9c65 | 647 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 648 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
649 | break; |
650 | } | |
651 | case 5: | |
652 | { | |
653 | void (*fptr)(void *__data, | |
fc4f7161 | 654 | long ret, |
5b7ac358 MD |
655 | unsigned long arg0, |
656 | unsigned long arg1, | |
657 | unsigned long arg2, | |
658 | unsigned long arg3, | |
659 | unsigned long arg4) = entry->func; | |
1b7b9c65 | 660 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 661 | |
1b7b9c65 | 662 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 663 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
664 | break; |
665 | } | |
666 | case 6: | |
667 | { | |
668 | void (*fptr)(void *__data, | |
fc4f7161 | 669 | long ret, |
5b7ac358 MD |
670 | unsigned long arg0, |
671 | unsigned long arg1, | |
672 | unsigned long arg2, | |
673 | unsigned long arg3, | |
674 | unsigned long arg4, | |
675 | unsigned long arg5) = entry->func; | |
1b7b9c65 | 676 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 677 | |
1b7b9c65 | 678 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 679 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
680 | args[3], args[4], args[5]); |
681 | break; | |
682 | } | |
683 | default: | |
684 | break; | |
685 | } | |
686 | } | |
687 | ||
33a39a3c MD |
688 | /* |
689 | * noinline to diminish caller stack size. | |
690 | * Should be called with sessions lock held. | |
691 | */ | |
49c50022 MD |
692 | static |
693 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
694 | struct lttng_event **chan_table, struct lttng_channel *chan, |
695 | void *filter, enum sc_type type) | |
259b6cb3 | 696 | { |
2a0c4816 | 697 | const struct lttng_event_desc *desc; |
259b6cb3 | 698 | unsigned int i; |
49c50022 MD |
699 | |
700 | /* Allocate events for each syscall, insert into table */ | |
701 | for (i = 0; i < table_len; i++) { | |
702 | struct lttng_kernel_event ev; | |
2a0c4816 | 703 | desc = table[i].desc; |
49c50022 MD |
704 | |
705 | if (!desc) { | |
706 | /* Unknown syscall */ | |
707 | continue; | |
708 | } | |
709 | /* | |
710 | * Skip those already populated by previous failed | |
711 | * register for this channel. | |
712 | */ | |
713 | if (chan_table[i]) | |
714 | continue; | |
715 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
716 | switch (type) { |
717 | case SC_TYPE_ENTRY: | |
718 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
719 | LTTNG_KERNEL_SYM_NAME_LEN); | |
720 | break; | |
721 | case SC_TYPE_EXIT: | |
722 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
723 | LTTNG_KERNEL_SYM_NAME_LEN); | |
724 | break; | |
725 | case SC_TYPE_COMPAT_ENTRY: | |
726 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
727 | LTTNG_KERNEL_SYM_NAME_LEN); | |
728 | break; | |
729 | case SC_TYPE_COMPAT_EXIT: | |
730 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
731 | LTTNG_KERNEL_SYM_NAME_LEN); | |
732 | break; | |
733 | default: | |
734 | BUG_ON(1); | |
735 | break; | |
736 | } | |
737 | strncat(ev.name, desc->name, | |
738 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 739 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
740 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
741 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 742 | desc, ev.instrumentation); |
abc0446a MD |
743 | WARN_ON_ONCE(!chan_table[i]); |
744 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
745 | /* |
746 | * If something goes wrong in event registration | |
747 | * after the first one, we have no choice but to | |
748 | * leave the previous events in there, until | |
749 | * deleted by session teardown. | |
750 | */ | |
abc0446a | 751 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
752 | } |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
33a39a3c MD |
757 | /* |
758 | * Should be called with sessions lock held. | |
759 | */ | |
a90917c3 | 760 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 761 | { |
2a0c4816 | 762 | struct lttng_kernel_event ev; |
259b6cb3 MD |
763 | int ret; |
764 | ||
263b6c88 | 765 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
766 | |
767 | if (!chan->sc_table) { | |
768 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 769 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
770 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
771 | if (!chan->sc_table) | |
772 | return -ENOMEM; | |
773 | } | |
5b7ac358 MD |
774 | if (!chan->sc_exit_table) { |
775 | /* create syscall table mapping syscall to events */ | |
776 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
777 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
778 | if (!chan->sc_exit_table) | |
779 | return -ENOMEM; | |
780 | } | |
781 | ||
259b6cb3 | 782 | |
49c50022 MD |
783 | #ifdef CONFIG_COMPAT |
784 | if (!chan->compat_sc_table) { | |
785 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 786 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 787 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
788 | if (!chan->compat_sc_table) |
789 | return -ENOMEM; | |
790 | } | |
5b7ac358 MD |
791 | |
792 | if (!chan->compat_sc_exit_table) { | |
793 | /* create syscall table mapping compat syscall to events */ | |
794 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
795 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
796 | if (!chan->compat_sc_exit_table) | |
797 | return -ENOMEM; | |
798 | } | |
49c50022 | 799 | #endif |
f405cfce | 800 | if (!chan->sc_unknown) { |
f405cfce | 801 | const struct lttng_event_desc *desc = |
d4291869 | 802 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 803 | |
f405cfce | 804 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
805 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
806 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
807 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
808 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
809 | desc, |
810 | ev.instrumentation); | |
abc0446a MD |
811 | WARN_ON_ONCE(!chan->sc_unknown); |
812 | if (IS_ERR(chan->sc_unknown)) { | |
813 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
814 | } |
815 | } | |
816 | ||
b76dc1a0 | 817 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 818 | const struct lttng_event_desc *desc = |
d4291869 | 819 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
820 | |
821 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
822 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
823 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
824 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
825 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
826 | desc, |
827 | ev.instrumentation); | |
abc0446a MD |
828 | WARN_ON_ONCE(!chan->sc_unknown); |
829 | if (IS_ERR(chan->sc_compat_unknown)) { | |
830 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
831 | } |
832 | } | |
833 | ||
5b7ac358 | 834 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 835 | const struct lttng_event_desc *desc = |
5b7ac358 | 836 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
837 | |
838 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
839 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
840 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
841 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
842 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, | |
3c997079 MD |
843 | filter, desc, |
844 | ev.instrumentation); | |
5b7ac358 MD |
845 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
846 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
847 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
848 | } | |
849 | } | |
850 | ||
851 | if (!chan->sc_exit_unknown) { | |
852 | const struct lttng_event_desc *desc = | |
853 | &__event_desc___syscall_exit_unknown; | |
854 | ||
855 | memset(&ev, 0, sizeof(ev)); | |
856 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
857 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
858 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
859 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 860 | desc, ev.instrumentation); |
5b7ac358 MD |
861 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
862 | if (IS_ERR(chan->sc_exit_unknown)) { | |
863 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
864 | } |
865 | } | |
866 | ||
49c50022 | 867 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
868 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
869 | if (ret) | |
870 | return ret; | |
871 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
872 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
873 | if (ret) |
874 | return ret; | |
5b7ac358 | 875 | |
49c50022 | 876 | #ifdef CONFIG_COMPAT |
a93244f8 | 877 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
878 | chan->compat_sc_table, chan, filter, |
879 | SC_TYPE_COMPAT_ENTRY); | |
880 | if (ret) | |
881 | return ret; | |
882 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
883 | chan->compat_sc_exit_table, chan, filter, | |
884 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
885 | if (ret) |
886 | return ret; | |
887 | #endif | |
80f87dd2 MD |
888 | if (!chan->sys_enter_registered) { |
889 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
890 | (void *) syscall_entry_probe, chan); | |
891 | if (ret) | |
892 | return ret; | |
893 | chan->sys_enter_registered = 1; | |
894 | } | |
63728b02 MD |
895 | /* |
896 | * We change the name of sys_exit tracepoint due to namespace | |
897 | * conflict with sys_exit syscall entry. | |
898 | */ | |
80f87dd2 MD |
899 | if (!chan->sys_exit_registered) { |
900 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 901 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
902 | if (ret) { |
903 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
904 | (void *) syscall_entry_probe, chan)); | |
905 | return ret; | |
906 | } | |
907 | chan->sys_exit_registered = 1; | |
63728b02 | 908 | } |
259b6cb3 MD |
909 | return ret; |
910 | } | |
911 | ||
912 | /* | |
913 | * Only called at session destruction. | |
914 | */ | |
a90917c3 | 915 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
916 | { |
917 | int ret; | |
918 | ||
919 | if (!chan->sc_table) | |
920 | return 0; | |
80f87dd2 | 921 | if (chan->sys_enter_registered) { |
2d9cd7f3 FD |
922 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
923 | (void *) syscall_entry_probe, chan); | |
80f87dd2 MD |
924 | if (ret) |
925 | return ret; | |
926 | chan->sys_enter_registered = 0; | |
927 | } | |
928 | if (chan->sys_exit_registered) { | |
2d9cd7f3 FD |
929 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
930 | (void *) syscall_exit_probe, chan); | |
80f87dd2 MD |
931 | if (ret) |
932 | return ret; | |
933 | chan->sys_exit_registered = 0; | |
934 | } | |
a90917c3 | 935 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 936 | kfree(chan->sc_table); |
5b7ac358 | 937 | kfree(chan->sc_exit_table); |
49c50022 MD |
938 | #ifdef CONFIG_COMPAT |
939 | kfree(chan->compat_sc_table); | |
5b7ac358 | 940 | kfree(chan->compat_sc_exit_table); |
49c50022 | 941 | #endif |
80f87dd2 MD |
942 | kfree(chan->sc_filter); |
943 | return 0; | |
944 | } | |
945 | ||
946 | static | |
947 | int get_syscall_nr(const char *syscall_name) | |
948 | { | |
949 | int syscall_nr = -1; | |
950 | int i; | |
951 | ||
952 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
953 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 954 | const char *it_name; |
80f87dd2 MD |
955 | |
956 | entry = &sc_table[i]; | |
957 | if (!entry->desc) | |
958 | continue; | |
5b7ac358 MD |
959 | it_name = entry->desc->name; |
960 | it_name += strlen(SYSCALL_ENTRY_STR); | |
961 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
962 | syscall_nr = i; |
963 | break; | |
964 | } | |
965 | } | |
966 | return syscall_nr; | |
967 | } | |
968 | ||
969 | static | |
970 | int get_compat_syscall_nr(const char *syscall_name) | |
971 | { | |
972 | int syscall_nr = -1; | |
973 | int i; | |
974 | ||
975 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
976 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 977 | const char *it_name; |
80f87dd2 MD |
978 | |
979 | entry = &compat_sc_table[i]; | |
980 | if (!entry->desc) | |
981 | continue; | |
5b7ac358 MD |
982 | it_name = entry->desc->name; |
983 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
984 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
985 | syscall_nr = i; |
986 | break; | |
987 | } | |
988 | } | |
989 | return syscall_nr; | |
990 | } | |
991 | ||
12e579db MD |
992 | static |
993 | uint32_t get_sc_tables_len(void) | |
994 | { | |
995 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
996 | } | |
997 | ||
80f87dd2 MD |
998 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
999 | const char *name) | |
1000 | { | |
1001 | int syscall_nr, compat_syscall_nr, ret; | |
1002 | struct lttng_syscall_filter *filter; | |
1003 | ||
1004 | WARN_ON_ONCE(!chan->sc_table); | |
1005 | ||
1006 | if (!name) { | |
1007 | /* Enable all system calls by removing filter */ | |
1008 | if (chan->sc_filter) { | |
1009 | filter = chan->sc_filter; | |
1010 | rcu_assign_pointer(chan->sc_filter, NULL); | |
1011 | synchronize_trace(); | |
1012 | kfree(filter); | |
1013 | } | |
1014 | chan->syscall_all = 1; | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | if (!chan->sc_filter) { | |
1019 | if (chan->syscall_all) { | |
1020 | /* | |
1021 | * All syscalls are already enabled. | |
1022 | */ | |
1023 | return -EEXIST; | |
1024 | } | |
1025 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1026 | GFP_KERNEL); | |
1027 | if (!filter) | |
1028 | return -ENOMEM; | |
1029 | } else { | |
1030 | filter = chan->sc_filter; | |
1031 | } | |
1032 | syscall_nr = get_syscall_nr(name); | |
1033 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1034 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1035 | ret = -ENOENT; | |
1036 | goto error; | |
1037 | } | |
1038 | if (syscall_nr >= 0) { | |
1039 | if (test_bit(syscall_nr, filter->sc)) { | |
1040 | ret = -EEXIST; | |
1041 | goto error; | |
1042 | } | |
1043 | bitmap_set(filter->sc, syscall_nr, 1); | |
1044 | } | |
1045 | if (compat_syscall_nr >= 0) { | |
1046 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1047 | ret = -EEXIST; | |
1048 | goto error; | |
1049 | } | |
1050 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1051 | } | |
1052 | if (!chan->sc_filter) | |
1053 | rcu_assign_pointer(chan->sc_filter, filter); | |
1054 | return 0; | |
1055 | ||
1056 | error: | |
1057 | if (!chan->sc_filter) | |
1058 | kfree(filter); | |
1059 | return ret; | |
1060 | } | |
1061 | ||
1062 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1063 | const char *name) | |
1064 | { | |
1065 | int syscall_nr, compat_syscall_nr, ret; | |
1066 | struct lttng_syscall_filter *filter; | |
1067 | ||
1068 | WARN_ON_ONCE(!chan->sc_table); | |
1069 | ||
1070 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1071 | if (!chan->syscall_all) |
1072 | return -EEXIST; | |
80f87dd2 MD |
1073 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1074 | GFP_KERNEL); | |
1075 | if (!filter) | |
1076 | return -ENOMEM; | |
1077 | /* Trace all system calls, then apply disable. */ | |
1078 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1079 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1080 | } else { | |
1081 | filter = chan->sc_filter; | |
1082 | } | |
1083 | ||
72814741 | 1084 | if (!name) { |
404e87bf MD |
1085 | /* Fail if all syscalls are already disabled. */ |
1086 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1087 | && bitmap_empty(filter->sc_compat, | |
1088 | NR_compat_syscalls)) { | |
1089 | ret = -EEXIST; | |
1090 | goto error; | |
1091 | } | |
1092 | ||
72814741 MD |
1093 | /* Disable all system calls */ |
1094 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1095 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1096 | goto apply_filter; | |
1097 | } | |
80f87dd2 MD |
1098 | syscall_nr = get_syscall_nr(name); |
1099 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1100 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1101 | ret = -ENOENT; | |
1102 | goto error; | |
1103 | } | |
1104 | if (syscall_nr >= 0) { | |
cecef7f8 | 1105 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1106 | ret = -EEXIST; |
1107 | goto error; | |
1108 | } | |
cecef7f8 | 1109 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1110 | } |
1111 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1112 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1113 | ret = -EEXIST; |
1114 | goto error; | |
1115 | } | |
cecef7f8 | 1116 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1117 | } |
72814741 | 1118 | apply_filter: |
80f87dd2 MD |
1119 | if (!chan->sc_filter) |
1120 | rcu_assign_pointer(chan->sc_filter, filter); | |
1121 | chan->syscall_all = 0; | |
259b6cb3 | 1122 | return 0; |
80f87dd2 MD |
1123 | |
1124 | error: | |
1125 | if (!chan->sc_filter) | |
1126 | kfree(filter); | |
1127 | return ret; | |
259b6cb3 | 1128 | } |
2d2464bd MD |
1129 | |
1130 | static | |
1131 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1132 | { | |
1133 | const struct trace_syscall_entry *entry; | |
1134 | int iter = 0; | |
1135 | ||
1136 | for (entry = sc_table; | |
1137 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1138 | entry++) { | |
1139 | if (iter++ >= *pos) | |
1140 | return entry; | |
1141 | } | |
1142 | for (entry = compat_sc_table; | |
1143 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1144 | entry++) { | |
1145 | if (iter++ >= *pos) | |
1146 | return entry; | |
1147 | } | |
1148 | /* End of list */ | |
1149 | return NULL; | |
1150 | } | |
1151 | ||
1152 | static | |
1153 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1154 | { | |
1155 | return (void *) syscall_list_get_entry(pos); | |
1156 | } | |
1157 | ||
1158 | static | |
1159 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1160 | { | |
1161 | (*ppos)++; | |
1162 | return (void *) syscall_list_get_entry(ppos); | |
1163 | } | |
1164 | ||
1165 | static | |
1166 | void syscall_list_stop(struct seq_file *m, void *p) | |
1167 | { | |
1168 | } | |
1169 | ||
12e579db MD |
1170 | static |
1171 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1172 | const struct trace_syscall_entry **table, | |
1173 | unsigned int *bitness) | |
1174 | { | |
1175 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1176 | if (bitness) | |
1177 | *bitness = BITS_PER_LONG; | |
1178 | if (table) | |
1179 | *table = sc_table; | |
1180 | return 0; | |
1181 | } | |
1182 | if (!(entry >= compat_sc_table | |
1183 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1184 | return -EINVAL; | |
1185 | } | |
1186 | if (bitness) | |
1187 | *bitness = 32; | |
1188 | if (table) | |
1189 | *table = compat_sc_table; | |
1190 | return 0; | |
1191 | } | |
1192 | ||
2d2464bd MD |
1193 | static |
1194 | int syscall_list_show(struct seq_file *m, void *p) | |
1195 | { | |
1196 | const struct trace_syscall_entry *table, *entry = p; | |
1197 | unsigned int bitness; | |
d4291869 | 1198 | unsigned long index; |
12e579db | 1199 | int ret; |
d4291869 | 1200 | const char *name; |
2d2464bd | 1201 | |
12e579db MD |
1202 | ret = get_sc_table(entry, &table, &bitness); |
1203 | if (ret) | |
1204 | return ret; | |
f4855b46 MD |
1205 | if (!entry->desc) |
1206 | return 0; | |
d4291869 MD |
1207 | if (table == sc_table) { |
1208 | index = entry - table; | |
1209 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1210 | } else { | |
1211 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1212 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1213 | } | |
12e579db | 1214 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1215 | index, name, bitness); |
2d2464bd MD |
1216 | return 0; |
1217 | } | |
1218 | ||
1219 | static | |
1220 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1221 | .start = syscall_list_start, | |
1222 | .next = syscall_list_next, | |
1223 | .stop = syscall_list_stop, | |
1224 | .show = syscall_list_show, | |
1225 | }; | |
1226 | ||
1227 | static | |
1228 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1229 | { | |
1230 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1231 | } | |
1232 | ||
1233 | const struct file_operations lttng_syscall_list_fops = { | |
1234 | .owner = THIS_MODULE, | |
1235 | .open = lttng_syscall_list_open, | |
1236 | .read = seq_read, | |
1237 | .llseek = seq_lseek, | |
1238 | .release = seq_release, | |
1239 | }; | |
12e579db MD |
1240 | |
1241 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1242 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1243 | { | |
1244 | uint32_t len, sc_tables_len, bitmask_len; | |
1245 | int ret = 0, bit; | |
1246 | char *tmp_mask; | |
1247 | struct lttng_syscall_filter *filter; | |
1248 | ||
1249 | ret = get_user(len, &usyscall_mask->len); | |
1250 | if (ret) | |
1251 | return ret; | |
1252 | sc_tables_len = get_sc_tables_len(); | |
1253 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1254 | if (len < sc_tables_len) { | |
1255 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1256 | } | |
1257 | /* Array is large enough, we can copy array to user-space. */ | |
1258 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1259 | if (!tmp_mask) | |
1260 | return -ENOMEM; | |
1261 | filter = channel->sc_filter; | |
1262 | ||
1263 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1264 | char state; |
2f25059d MD |
1265 | |
1266 | if (channel->sc_table) { | |
1267 | if (filter) | |
1268 | state = test_bit(bit, filter->sc); | |
1269 | else | |
1270 | state = 1; | |
1271 | } else { | |
1272 | state = 0; | |
1273 | } | |
1274 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1275 | } |
1276 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1277 | char state; |
2f25059d MD |
1278 | |
1279 | if (channel->compat_sc_table) { | |
1280 | if (filter) | |
1281 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1282 | filter->sc_compat); | |
1283 | else | |
1284 | state = 1; | |
1285 | } else { | |
1286 | state = 0; | |
1287 | } | |
1288 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1289 | } |
1290 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1291 | ret = -EFAULT; | |
1292 | kfree(tmp_mask); | |
1293 | return ret; | |
1294 | } | |
082d4946 MD |
1295 | |
1296 | int lttng_abi_syscall_list(void) | |
1297 | { | |
1298 | struct file *syscall_list_file; | |
1299 | int file_fd, ret; | |
1300 | ||
4ac10b76 | 1301 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1302 | if (file_fd < 0) { |
1303 | ret = file_fd; | |
1304 | goto fd_error; | |
1305 | } | |
1306 | ||
1307 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1308 | <tng_syscall_list_fops, | |
1309 | NULL, O_RDWR); | |
1310 | if (IS_ERR(syscall_list_file)) { | |
1311 | ret = PTR_ERR(syscall_list_file); | |
1312 | goto file_error; | |
1313 | } | |
1314 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1315 | if (ret < 0) | |
1316 | goto open_error; | |
1317 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1318 | return file_fd; |
1319 | ||
1320 | open_error: | |
1321 | fput(syscall_list_file); | |
1322 | file_error: | |
1323 | put_unused_fd(file_fd); | |
1324 | fd_error: | |
1325 | return ret; | |
1326 | } |