Commit | Line | Data |
---|---|---|
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 | 371 | struct lttng_syscall_filter { |
badfe9f5 MD |
372 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
373 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
374 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
375 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
376 | }; |
377 | ||
a90917c3 | 378 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
379 | struct pt_regs *regs, unsigned int id) |
380 | { | |
1b7b9c65 | 381 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 382 | |
1b7b9c65 | 383 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 384 | if (unlikely(in_compat_syscall())) |
d4291869 | 385 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 386 | else |
d4291869 | 387 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
388 | } |
389 | ||
2faf7d1b | 390 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 391 | { |
a90917c3 MD |
392 | struct lttng_channel *chan = __data; |
393 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
394 | const struct trace_syscall_entry *table, *entry; |
395 | size_t table_len; | |
259b6cb3 | 396 | |
1aa3298b | 397 | if (unlikely(in_compat_syscall())) { |
badfe9f5 MD |
398 | struct lttng_syscall_filter *filter = chan->sc_filter; |
399 | ||
400 | if (id < 0 || id >= NR_compat_syscalls | |
401 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_entry))) { | |
402 | /* System call filtered out. */ | |
403 | return; | |
80f87dd2 | 404 | } |
49c50022 | 405 | table = compat_sc_table; |
a93244f8 | 406 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
407 | unknown_event = chan->sc_compat_unknown; |
408 | } else { | |
badfe9f5 MD |
409 | struct lttng_syscall_filter *filter = chan->sc_filter; |
410 | ||
411 | if (id < 0 || id >= NR_syscalls | |
412 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_entry))) { | |
413 | /* System call filtered out. */ | |
414 | return; | |
80f87dd2 | 415 | } |
49c50022 MD |
416 | table = sc_table; |
417 | table_len = ARRAY_SIZE(sc_table); | |
418 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 419 | } |
74f7b56a | 420 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 421 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 422 | return; |
f405cfce | 423 | } |
1aa3298b | 424 | if (unlikely(in_compat_syscall())) |
49c50022 MD |
425 | event = chan->compat_sc_table[id]; |
426 | else | |
427 | event = chan->sc_table[id]; | |
f405cfce | 428 | if (unlikely(!event)) { |
49c50022 | 429 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
430 | return; |
431 | } | |
49c50022 | 432 | entry = &table[id]; |
f405cfce | 433 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
434 | |
435 | switch (entry->nrargs) { | |
436 | case 0: | |
437 | { | |
438 | void (*fptr)(void *__data) = entry->func; | |
439 | ||
440 | fptr(event); | |
441 | break; | |
442 | } | |
443 | case 1: | |
444 | { | |
445 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
1b7b9c65 | 446 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 447 | |
1b7b9c65 | 448 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
449 | fptr(event, args[0]); |
450 | break; | |
451 | } | |
452 | case 2: | |
453 | { | |
454 | void (*fptr)(void *__data, | |
455 | unsigned long arg0, | |
456 | unsigned long arg1) = entry->func; | |
1b7b9c65 | 457 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 458 | |
1b7b9c65 | 459 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
460 | fptr(event, args[0], args[1]); |
461 | break; | |
462 | } | |
463 | case 3: | |
464 | { | |
465 | void (*fptr)(void *__data, | |
466 | unsigned long arg0, | |
467 | unsigned long arg1, | |
468 | unsigned long arg2) = entry->func; | |
1b7b9c65 | 469 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 470 | |
1b7b9c65 | 471 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
472 | fptr(event, args[0], args[1], args[2]); |
473 | break; | |
474 | } | |
475 | case 4: | |
476 | { | |
477 | void (*fptr)(void *__data, | |
478 | unsigned long arg0, | |
479 | unsigned long arg1, | |
480 | unsigned long arg2, | |
481 | unsigned long arg3) = entry->func; | |
1b7b9c65 | 482 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 483 | |
1b7b9c65 | 484 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
485 | fptr(event, args[0], args[1], args[2], args[3]); |
486 | break; | |
487 | } | |
488 | case 5: | |
489 | { | |
490 | void (*fptr)(void *__data, | |
491 | unsigned long arg0, | |
492 | unsigned long arg1, | |
493 | unsigned long arg2, | |
494 | unsigned long arg3, | |
495 | unsigned long arg4) = entry->func; | |
1b7b9c65 | 496 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 497 | |
1b7b9c65 | 498 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
499 | fptr(event, args[0], args[1], args[2], args[3], args[4]); |
500 | break; | |
501 | } | |
502 | case 6: | |
503 | { | |
504 | void (*fptr)(void *__data, | |
505 | unsigned long arg0, | |
506 | unsigned long arg1, | |
507 | unsigned long arg2, | |
508 | unsigned long arg3, | |
509 | unsigned long arg4, | |
510 | unsigned long arg5) = entry->func; | |
1b7b9c65 | 511 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 512 | |
1b7b9c65 | 513 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
514 | fptr(event, args[0], args[1], args[2], |
515 | args[3], args[4], args[5]); | |
516 | break; | |
517 | } | |
518 | default: | |
519 | break; | |
520 | } | |
521 | } | |
522 | ||
5b7ac358 | 523 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 524 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 525 | { |
1b7b9c65 | 526 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 527 | |
1b7b9c65 | 528 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 529 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
530 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
531 | args); | |
532 | else | |
533 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
534 | } | |
535 | ||
536 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
537 | { | |
538 | struct lttng_channel *chan = __data; | |
539 | struct lttng_event *event, *unknown_event; | |
540 | const struct trace_syscall_entry *table, *entry; | |
541 | size_t table_len; | |
542 | long id; | |
543 | ||
544 | id = syscall_get_nr(current, regs); | |
1aa3298b | 545 | if (unlikely(in_compat_syscall())) { |
badfe9f5 MD |
546 | struct lttng_syscall_filter *filter = chan->sc_filter; |
547 | ||
548 | if (id < 0 || id >= NR_compat_syscalls | |
549 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_exit))) { | |
550 | /* System call filtered out. */ | |
551 | return; | |
5b7ac358 MD |
552 | } |
553 | table = compat_sc_exit_table; | |
554 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
555 | unknown_event = chan->compat_sc_exit_unknown; | |
556 | } else { | |
badfe9f5 MD |
557 | struct lttng_syscall_filter *filter = chan->sc_filter; |
558 | ||
559 | if (id < 0 || id >= NR_syscalls | |
560 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_exit))) { | |
561 | /* System call filtered out. */ | |
562 | return; | |
5b7ac358 MD |
563 | } |
564 | table = sc_exit_table; | |
565 | table_len = ARRAY_SIZE(sc_exit_table); | |
566 | unknown_event = chan->sc_exit_unknown; | |
567 | } | |
74f7b56a | 568 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
569 | syscall_exit_unknown(unknown_event, regs, id, ret); |
570 | return; | |
571 | } | |
1aa3298b | 572 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
573 | event = chan->compat_sc_exit_table[id]; |
574 | else | |
575 | event = chan->sc_exit_table[id]; | |
576 | if (unlikely(!event)) { | |
577 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
578 | return; | |
579 | } | |
580 | entry = &table[id]; | |
581 | WARN_ON_ONCE(!entry); | |
582 | ||
583 | switch (entry->nrargs) { | |
584 | case 0: | |
585 | { | |
fc4f7161 | 586 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 587 | |
fc4f7161 | 588 | fptr(event, ret); |
5b7ac358 MD |
589 | break; |
590 | } | |
591 | case 1: | |
592 | { | |
593 | void (*fptr)(void *__data, | |
fc4f7161 | 594 | long ret, |
5b7ac358 | 595 | unsigned long arg0) = entry->func; |
1b7b9c65 | 596 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 597 | |
1b7b9c65 | 598 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 599 | fptr(event, ret, args[0]); |
5b7ac358 MD |
600 | break; |
601 | } | |
602 | case 2: | |
603 | { | |
604 | void (*fptr)(void *__data, | |
fc4f7161 | 605 | long ret, |
5b7ac358 MD |
606 | unsigned long arg0, |
607 | unsigned long arg1) = entry->func; | |
1b7b9c65 | 608 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 609 | |
1b7b9c65 | 610 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 611 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
612 | break; |
613 | } | |
614 | case 3: | |
615 | { | |
616 | void (*fptr)(void *__data, | |
fc4f7161 | 617 | long ret, |
5b7ac358 MD |
618 | unsigned long arg0, |
619 | unsigned long arg1, | |
620 | unsigned long arg2) = entry->func; | |
1b7b9c65 | 621 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 622 | |
1b7b9c65 | 623 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 624 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
625 | break; |
626 | } | |
627 | case 4: | |
628 | { | |
629 | void (*fptr)(void *__data, | |
fc4f7161 | 630 | long ret, |
5b7ac358 MD |
631 | unsigned long arg0, |
632 | unsigned long arg1, | |
633 | unsigned long arg2, | |
634 | unsigned long arg3) = entry->func; | |
1b7b9c65 | 635 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 636 | |
1b7b9c65 | 637 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 638 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
639 | break; |
640 | } | |
641 | case 5: | |
642 | { | |
643 | void (*fptr)(void *__data, | |
fc4f7161 | 644 | long ret, |
5b7ac358 MD |
645 | unsigned long arg0, |
646 | unsigned long arg1, | |
647 | unsigned long arg2, | |
648 | unsigned long arg3, | |
649 | unsigned long arg4) = entry->func; | |
1b7b9c65 | 650 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 651 | |
1b7b9c65 | 652 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 653 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
654 | break; |
655 | } | |
656 | case 6: | |
657 | { | |
658 | void (*fptr)(void *__data, | |
fc4f7161 | 659 | long ret, |
5b7ac358 MD |
660 | unsigned long arg0, |
661 | unsigned long arg1, | |
662 | unsigned long arg2, | |
663 | unsigned long arg3, | |
664 | unsigned long arg4, | |
665 | unsigned long arg5) = entry->func; | |
1b7b9c65 | 666 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 667 | |
1b7b9c65 | 668 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 669 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
670 | args[3], args[4], args[5]); |
671 | break; | |
672 | } | |
673 | default: | |
674 | break; | |
675 | } | |
676 | } | |
677 | ||
33a39a3c MD |
678 | /* |
679 | * noinline to diminish caller stack size. | |
680 | * Should be called with sessions lock held. | |
681 | */ | |
49c50022 MD |
682 | static |
683 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
684 | struct lttng_event **chan_table, struct lttng_channel *chan, |
685 | void *filter, enum sc_type type) | |
259b6cb3 | 686 | { |
2a0c4816 | 687 | const struct lttng_event_desc *desc; |
259b6cb3 | 688 | unsigned int i; |
49c50022 MD |
689 | |
690 | /* Allocate events for each syscall, insert into table */ | |
691 | for (i = 0; i < table_len; i++) { | |
692 | struct lttng_kernel_event ev; | |
2a0c4816 | 693 | desc = table[i].desc; |
49c50022 MD |
694 | |
695 | if (!desc) { | |
696 | /* Unknown syscall */ | |
697 | continue; | |
698 | } | |
699 | /* | |
700 | * Skip those already populated by previous failed | |
701 | * register for this channel. | |
702 | */ | |
703 | if (chan_table[i]) | |
704 | continue; | |
705 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
706 | switch (type) { |
707 | case SC_TYPE_ENTRY: | |
badfe9f5 MD |
708 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
709 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
710 | break; |
711 | case SC_TYPE_EXIT: | |
badfe9f5 MD |
712 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
713 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
714 | break; |
715 | case SC_TYPE_COMPAT_ENTRY: | |
badfe9f5 MD |
716 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
717 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
718 | break; |
719 | case SC_TYPE_COMPAT_EXIT: | |
badfe9f5 MD |
720 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
721 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
722 | break; |
723 | } | |
badfe9f5 | 724 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
f8695253 | 725 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
726 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
727 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 728 | desc, ev.instrumentation); |
abc0446a MD |
729 | WARN_ON_ONCE(!chan_table[i]); |
730 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
731 | /* |
732 | * If something goes wrong in event registration | |
733 | * after the first one, we have no choice but to | |
734 | * leave the previous events in there, until | |
735 | * deleted by session teardown. | |
736 | */ | |
abc0446a | 737 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
738 | } |
739 | } | |
740 | return 0; | |
741 | } | |
742 | ||
33a39a3c MD |
743 | /* |
744 | * Should be called with sessions lock held. | |
745 | */ | |
a90917c3 | 746 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 747 | { |
2a0c4816 | 748 | struct lttng_kernel_event ev; |
259b6cb3 MD |
749 | int ret; |
750 | ||
263b6c88 | 751 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
752 | |
753 | if (!chan->sc_table) { | |
754 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 755 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
756 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
757 | if (!chan->sc_table) | |
758 | return -ENOMEM; | |
759 | } | |
5b7ac358 MD |
760 | if (!chan->sc_exit_table) { |
761 | /* create syscall table mapping syscall to events */ | |
762 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
763 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
764 | if (!chan->sc_exit_table) | |
765 | return -ENOMEM; | |
766 | } | |
767 | ||
259b6cb3 | 768 | |
49c50022 MD |
769 | #ifdef CONFIG_COMPAT |
770 | if (!chan->compat_sc_table) { | |
771 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 772 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 773 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
774 | if (!chan->compat_sc_table) |
775 | return -ENOMEM; | |
776 | } | |
5b7ac358 MD |
777 | |
778 | if (!chan->compat_sc_exit_table) { | |
779 | /* create syscall table mapping compat syscall to events */ | |
780 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
781 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
782 | if (!chan->compat_sc_exit_table) | |
783 | return -ENOMEM; | |
784 | } | |
49c50022 | 785 | #endif |
f405cfce | 786 | if (!chan->sc_unknown) { |
f405cfce | 787 | const struct lttng_event_desc *desc = |
d4291869 | 788 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 789 | |
f405cfce | 790 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
791 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
792 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 793 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
794 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
795 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 796 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
797 | desc, |
798 | ev.instrumentation); | |
abc0446a MD |
799 | WARN_ON_ONCE(!chan->sc_unknown); |
800 | if (IS_ERR(chan->sc_unknown)) { | |
801 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
802 | } |
803 | } | |
804 | ||
b76dc1a0 | 805 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 806 | const struct lttng_event_desc *desc = |
d4291869 | 807 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
808 | |
809 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
810 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
811 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 812 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
813 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
814 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 815 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
816 | desc, |
817 | ev.instrumentation); | |
abc0446a MD |
818 | WARN_ON_ONCE(!chan->sc_unknown); |
819 | if (IS_ERR(chan->sc_compat_unknown)) { | |
820 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
821 | } |
822 | } | |
823 | ||
5b7ac358 | 824 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 825 | const struct lttng_event_desc *desc = |
5b7ac358 | 826 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
827 | |
828 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
829 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
830 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 831 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
832 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
833 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 834 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, |
3c997079 MD |
835 | filter, desc, |
836 | ev.instrumentation); | |
5b7ac358 MD |
837 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
838 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
839 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
840 | } | |
841 | } | |
842 | ||
843 | if (!chan->sc_exit_unknown) { | |
844 | const struct lttng_event_desc *desc = | |
845 | &__event_desc___syscall_exit_unknown; | |
846 | ||
847 | memset(&ev, 0, sizeof(ev)); | |
848 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
849 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 850 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
851 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
852 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 853 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 | 854 | desc, ev.instrumentation); |
5b7ac358 MD |
855 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
856 | if (IS_ERR(chan->sc_exit_unknown)) { | |
857 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
858 | } |
859 | } | |
860 | ||
49c50022 | 861 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
862 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
863 | if (ret) | |
864 | return ret; | |
865 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
866 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
867 | if (ret) |
868 | return ret; | |
5b7ac358 | 869 | |
49c50022 | 870 | #ifdef CONFIG_COMPAT |
a93244f8 | 871 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
872 | chan->compat_sc_table, chan, filter, |
873 | SC_TYPE_COMPAT_ENTRY); | |
874 | if (ret) | |
875 | return ret; | |
876 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
877 | chan->compat_sc_exit_table, chan, filter, | |
878 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
879 | if (ret) |
880 | return ret; | |
881 | #endif | |
badfe9f5 MD |
882 | |
883 | if (!chan->sc_filter) { | |
884 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
885 | GFP_KERNEL); | |
886 | if (!chan->sc_filter) | |
887 | return -ENOMEM; | |
888 | } | |
889 | ||
80f87dd2 MD |
890 | if (!chan->sys_enter_registered) { |
891 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
892 | (void *) syscall_entry_probe, chan); | |
893 | if (ret) | |
894 | return ret; | |
895 | chan->sys_enter_registered = 1; | |
896 | } | |
63728b02 MD |
897 | /* |
898 | * We change the name of sys_exit tracepoint due to namespace | |
899 | * conflict with sys_exit syscall entry. | |
900 | */ | |
80f87dd2 MD |
901 | if (!chan->sys_exit_registered) { |
902 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 903 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
904 | if (ret) { |
905 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
906 | (void *) syscall_entry_probe, chan)); | |
907 | return ret; | |
908 | } | |
909 | chan->sys_exit_registered = 1; | |
63728b02 | 910 | } |
259b6cb3 MD |
911 | return ret; |
912 | } | |
913 | ||
914 | /* | |
915 | * Only called at session destruction. | |
916 | */ | |
a90917c3 | 917 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
918 | { |
919 | int ret; | |
920 | ||
921 | if (!chan->sc_table) | |
922 | return 0; | |
80f87dd2 | 923 | if (chan->sys_enter_registered) { |
2d9cd7f3 FD |
924 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
925 | (void *) syscall_entry_probe, chan); | |
80f87dd2 MD |
926 | if (ret) |
927 | return ret; | |
928 | chan->sys_enter_registered = 0; | |
929 | } | |
930 | if (chan->sys_exit_registered) { | |
2d9cd7f3 FD |
931 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
932 | (void *) syscall_exit_probe, chan); | |
80f87dd2 MD |
933 | if (ret) |
934 | return ret; | |
935 | chan->sys_exit_registered = 0; | |
936 | } | |
badfe9f5 MD |
937 | return 0; |
938 | } | |
939 | ||
940 | int lttng_syscalls_destroy(struct lttng_channel *chan) | |
941 | { | |
259b6cb3 | 942 | kfree(chan->sc_table); |
5b7ac358 | 943 | kfree(chan->sc_exit_table); |
49c50022 MD |
944 | #ifdef CONFIG_COMPAT |
945 | kfree(chan->compat_sc_table); | |
5b7ac358 | 946 | kfree(chan->compat_sc_exit_table); |
49c50022 | 947 | #endif |
80f87dd2 MD |
948 | kfree(chan->sc_filter); |
949 | return 0; | |
950 | } | |
951 | ||
952 | static | |
953 | int get_syscall_nr(const char *syscall_name) | |
954 | { | |
955 | int syscall_nr = -1; | |
956 | int i; | |
957 | ||
958 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
959 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 960 | const char *it_name; |
80f87dd2 MD |
961 | |
962 | entry = &sc_table[i]; | |
963 | if (!entry->desc) | |
964 | continue; | |
5b7ac358 MD |
965 | it_name = entry->desc->name; |
966 | it_name += strlen(SYSCALL_ENTRY_STR); | |
967 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
968 | syscall_nr = i; |
969 | break; | |
970 | } | |
971 | } | |
972 | return syscall_nr; | |
973 | } | |
974 | ||
975 | static | |
976 | int get_compat_syscall_nr(const char *syscall_name) | |
977 | { | |
978 | int syscall_nr = -1; | |
979 | int i; | |
980 | ||
981 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
982 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 983 | const char *it_name; |
80f87dd2 MD |
984 | |
985 | entry = &compat_sc_table[i]; | |
986 | if (!entry->desc) | |
987 | continue; | |
5b7ac358 MD |
988 | it_name = entry->desc->name; |
989 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
990 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
991 | syscall_nr = i; |
992 | break; | |
993 | } | |
994 | } | |
995 | return syscall_nr; | |
996 | } | |
997 | ||
12e579db MD |
998 | static |
999 | uint32_t get_sc_tables_len(void) | |
1000 | { | |
1001 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1002 | } | |
1003 | ||
badfe9f5 MD |
1004 | static |
1005 | const char *get_syscall_name(struct lttng_event *event) | |
80f87dd2 | 1006 | { |
badfe9f5 | 1007 | size_t prefix_len = 0; |
80f87dd2 | 1008 | |
badfe9f5 | 1009 | WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL); |
80f87dd2 | 1010 | |
badfe9f5 MD |
1011 | switch (event->u.syscall.entryexit) { |
1012 | case LTTNG_SYSCALL_ENTRY: | |
1013 | switch (event->u.syscall.abi) { | |
1014 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1015 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1016 | break; | |
1017 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1018 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1019 | break; | |
80f87dd2 | 1020 | } |
badfe9f5 MD |
1021 | break; |
1022 | case LTTNG_SYSCALL_EXIT: | |
1023 | switch (event->u.syscall.abi) { | |
1024 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1025 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1026 | break; | |
1027 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1028 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1029 | break; | |
80f87dd2 | 1030 | } |
badfe9f5 | 1031 | break; |
80f87dd2 | 1032 | } |
badfe9f5 MD |
1033 | WARN_ON_ONCE(prefix_len == 0); |
1034 | return event->desc->name + prefix_len; | |
1035 | } | |
1036 | ||
1037 | int lttng_syscall_filter_enable(struct lttng_channel *chan, | |
1038 | struct lttng_event *event) | |
1039 | { | |
1040 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
1041 | const char *syscall_name; | |
1042 | unsigned long *bitmap; | |
1043 | int syscall_nr; | |
1044 | ||
1045 | WARN_ON_ONCE(!chan->sc_table); | |
1046 | ||
1047 | syscall_name = get_syscall_name(event); | |
1048 | ||
1049 | switch (event->u.syscall.abi) { | |
1050 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1051 | syscall_nr = get_syscall_nr(syscall_name); | |
1052 | break; | |
1053 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1054 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1055 | break; | |
1056 | default: | |
1057 | return -EINVAL; | |
80f87dd2 | 1058 | } |
badfe9f5 MD |
1059 | if (syscall_nr < 0) |
1060 | return -ENOENT; | |
1061 | ||
badfe9f5 MD |
1062 | switch (event->u.syscall.entryexit) { |
1063 | case LTTNG_SYSCALL_ENTRY: | |
1064 | switch (event->u.syscall.abi) { | |
1065 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1066 | bitmap = filter->sc_entry; | |
1067 | break; | |
1068 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1069 | bitmap = filter->sc_compat_entry; | |
1070 | break; | |
6d9694d8 MD |
1071 | default: |
1072 | return -EINVAL; | |
80f87dd2 | 1073 | } |
badfe9f5 MD |
1074 | break; |
1075 | case LTTNG_SYSCALL_EXIT: | |
1076 | switch (event->u.syscall.abi) { | |
1077 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1078 | bitmap = filter->sc_exit; | |
1079 | break; | |
1080 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1081 | bitmap = filter->sc_compat_exit; | |
1082 | break; | |
6d9694d8 MD |
1083 | default: |
1084 | return -EINVAL; | |
80f87dd2 | 1085 | } |
badfe9f5 MD |
1086 | break; |
1087 | default: | |
1088 | return -EINVAL; | |
80f87dd2 | 1089 | } |
badfe9f5 MD |
1090 | if (test_bit(syscall_nr, bitmap)) |
1091 | return -EEXIST; | |
1092 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1093 | return 0; |
80f87dd2 MD |
1094 | } |
1095 | ||
1096 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
badfe9f5 | 1097 | struct lttng_event *event) |
80f87dd2 | 1098 | { |
badfe9f5 MD |
1099 | struct lttng_syscall_filter *filter = chan->sc_filter; |
1100 | const char *syscall_name; | |
1101 | unsigned long *bitmap; | |
1102 | int syscall_nr; | |
80f87dd2 MD |
1103 | |
1104 | WARN_ON_ONCE(!chan->sc_table); | |
1105 | ||
badfe9f5 MD |
1106 | syscall_name = get_syscall_name(event); |
1107 | ||
1108 | switch (event->u.syscall.abi) { | |
1109 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1110 | syscall_nr = get_syscall_nr(syscall_name); | |
1111 | break; | |
1112 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1113 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1114 | break; | |
1115 | default: | |
1116 | return -EINVAL; | |
80f87dd2 | 1117 | } |
badfe9f5 MD |
1118 | if (syscall_nr < 0) |
1119 | return -ENOENT; | |
80f87dd2 | 1120 | |
badfe9f5 MD |
1121 | switch (event->u.syscall.entryexit) { |
1122 | case LTTNG_SYSCALL_ENTRY: | |
1123 | switch (event->u.syscall.abi) { | |
1124 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1125 | bitmap = filter->sc_entry; | |
1126 | break; | |
1127 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1128 | bitmap = filter->sc_compat_entry; | |
1129 | break; | |
6d9694d8 MD |
1130 | default: |
1131 | return -EINVAL; | |
80f87dd2 | 1132 | } |
badfe9f5 MD |
1133 | break; |
1134 | case LTTNG_SYSCALL_EXIT: | |
1135 | switch (event->u.syscall.abi) { | |
1136 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1137 | bitmap = filter->sc_exit; | |
1138 | break; | |
1139 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1140 | bitmap = filter->sc_compat_exit; | |
1141 | break; | |
6d9694d8 MD |
1142 | default: |
1143 | return -EINVAL; | |
80f87dd2 | 1144 | } |
badfe9f5 MD |
1145 | break; |
1146 | default: | |
1147 | return -EINVAL; | |
80f87dd2 | 1148 | } |
badfe9f5 MD |
1149 | if (!test_bit(syscall_nr, bitmap)) |
1150 | return -EEXIST; | |
1151 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1152 | |
badfe9f5 | 1153 | return 0; |
259b6cb3 | 1154 | } |
2d2464bd MD |
1155 | |
1156 | static | |
1157 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1158 | { | |
1159 | const struct trace_syscall_entry *entry; | |
1160 | int iter = 0; | |
1161 | ||
1162 | for (entry = sc_table; | |
1163 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1164 | entry++) { | |
1165 | if (iter++ >= *pos) | |
1166 | return entry; | |
1167 | } | |
1168 | for (entry = compat_sc_table; | |
1169 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1170 | entry++) { | |
1171 | if (iter++ >= *pos) | |
1172 | return entry; | |
1173 | } | |
1174 | /* End of list */ | |
1175 | return NULL; | |
1176 | } | |
1177 | ||
1178 | static | |
1179 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1180 | { | |
1181 | return (void *) syscall_list_get_entry(pos); | |
1182 | } | |
1183 | ||
1184 | static | |
1185 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1186 | { | |
1187 | (*ppos)++; | |
1188 | return (void *) syscall_list_get_entry(ppos); | |
1189 | } | |
1190 | ||
1191 | static | |
1192 | void syscall_list_stop(struct seq_file *m, void *p) | |
1193 | { | |
1194 | } | |
1195 | ||
12e579db MD |
1196 | static |
1197 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1198 | const struct trace_syscall_entry **table, | |
1199 | unsigned int *bitness) | |
1200 | { | |
1201 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1202 | if (bitness) | |
1203 | *bitness = BITS_PER_LONG; | |
1204 | if (table) | |
1205 | *table = sc_table; | |
1206 | return 0; | |
1207 | } | |
1208 | if (!(entry >= compat_sc_table | |
1209 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1210 | return -EINVAL; | |
1211 | } | |
1212 | if (bitness) | |
1213 | *bitness = 32; | |
1214 | if (table) | |
1215 | *table = compat_sc_table; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
2d2464bd MD |
1219 | static |
1220 | int syscall_list_show(struct seq_file *m, void *p) | |
1221 | { | |
1222 | const struct trace_syscall_entry *table, *entry = p; | |
1223 | unsigned int bitness; | |
d4291869 | 1224 | unsigned long index; |
12e579db | 1225 | int ret; |
d4291869 | 1226 | const char *name; |
2d2464bd | 1227 | |
12e579db MD |
1228 | ret = get_sc_table(entry, &table, &bitness); |
1229 | if (ret) | |
1230 | return ret; | |
f4855b46 MD |
1231 | if (!entry->desc) |
1232 | return 0; | |
d4291869 MD |
1233 | if (table == sc_table) { |
1234 | index = entry - table; | |
1235 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1236 | } else { | |
1237 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1238 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1239 | } | |
12e579db | 1240 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1241 | index, name, bitness); |
2d2464bd MD |
1242 | return 0; |
1243 | } | |
1244 | ||
1245 | static | |
1246 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1247 | .start = syscall_list_start, | |
1248 | .next = syscall_list_next, | |
1249 | .stop = syscall_list_stop, | |
1250 | .show = syscall_list_show, | |
1251 | }; | |
1252 | ||
1253 | static | |
1254 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1255 | { | |
1256 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1257 | } | |
1258 | ||
1259 | const struct file_operations lttng_syscall_list_fops = { | |
1260 | .owner = THIS_MODULE, | |
1261 | .open = lttng_syscall_list_open, | |
1262 | .read = seq_read, | |
1263 | .llseek = seq_lseek, | |
1264 | .release = seq_release, | |
1265 | }; | |
12e579db | 1266 | |
badfe9f5 MD |
1267 | /* |
1268 | * A syscall is enabled if it is traced for either entry or exit. | |
1269 | */ | |
12e579db MD |
1270 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
1271 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1272 | { | |
1273 | uint32_t len, sc_tables_len, bitmask_len; | |
1274 | int ret = 0, bit; | |
1275 | char *tmp_mask; | |
1276 | struct lttng_syscall_filter *filter; | |
1277 | ||
1278 | ret = get_user(len, &usyscall_mask->len); | |
1279 | if (ret) | |
1280 | return ret; | |
1281 | sc_tables_len = get_sc_tables_len(); | |
1282 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1283 | if (len < sc_tables_len) { | |
1284 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1285 | } | |
1286 | /* Array is large enough, we can copy array to user-space. */ | |
1287 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1288 | if (!tmp_mask) | |
1289 | return -ENOMEM; | |
1290 | filter = channel->sc_filter; | |
1291 | ||
1292 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1293 | char state; |
2f25059d MD |
1294 | |
1295 | if (channel->sc_table) { | |
badfe9f5 MD |
1296 | if (!READ_ONCE(channel->syscall_all) && filter) |
1297 | state = test_bit(bit, filter->sc_entry) | |
1298 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1299 | else |
1300 | state = 1; | |
1301 | } else { | |
1302 | state = 0; | |
1303 | } | |
1304 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1305 | } |
1306 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1307 | char state; |
2f25059d MD |
1308 | |
1309 | if (channel->compat_sc_table) { | |
badfe9f5 | 1310 | if (!READ_ONCE(channel->syscall_all) && filter) |
2f25059d | 1311 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
badfe9f5 MD |
1312 | filter->sc_compat_entry) |
1313 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
1314 | filter->sc_compat_exit); | |
2f25059d MD |
1315 | else |
1316 | state = 1; | |
1317 | } else { | |
1318 | state = 0; | |
1319 | } | |
1320 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1321 | } |
1322 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1323 | ret = -EFAULT; | |
1324 | kfree(tmp_mask); | |
1325 | return ret; | |
1326 | } | |
082d4946 MD |
1327 | |
1328 | int lttng_abi_syscall_list(void) | |
1329 | { | |
1330 | struct file *syscall_list_file; | |
1331 | int file_fd, ret; | |
1332 | ||
4ac10b76 | 1333 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1334 | if (file_fd < 0) { |
1335 | ret = file_fd; | |
1336 | goto fd_error; | |
1337 | } | |
1338 | ||
1339 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1340 | <tng_syscall_list_fops, | |
1341 | NULL, O_RDWR); | |
1342 | if (IS_ERR(syscall_list_file)) { | |
1343 | ret = PTR_ERR(syscall_list_file); | |
1344 | goto file_error; | |
1345 | } | |
1346 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1347 | if (ret < 0) | |
1348 | goto open_error; | |
1349 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1350 | return file_fd; |
1351 | ||
1352 | open_error: | |
1353 | fput(syscall_list_file); | |
1354 | file_error: | |
1355 | put_unused_fd(file_fd); | |
1356 | fd_error: | |
1357 | return ret; | |
1358 | } |