Commit | Line | Data |
---|---|---|
259b6cb3 MD |
1 | /* |
2 | * lttng-syscalls.c | |
3 | * | |
2faf7d1b | 4 | * LTTng syscall probes. |
259b6cb3 | 5 | * |
886d51a3 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
259b6cb3 MD |
21 | */ |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/slab.h> | |
6333ace3 | 25 | #include <linux/compat.h> |
abc0446a | 26 | #include <linux/err.h> |
80f87dd2 | 27 | #include <linux/bitmap.h> |
7ca580f8 MD |
28 | #include <linux/in.h> |
29 | #include <linux/in6.h> | |
2d2464bd | 30 | #include <linux/seq_file.h> |
d4291869 | 31 | #include <linux/stringify.h> |
082d4946 MD |
32 | #include <linux/file.h> |
33 | #include <linux/anon_inodes.h> | |
259b6cb3 MD |
34 | #include <asm/ptrace.h> |
35 | #include <asm/syscall.h> | |
36 | ||
241ae9a8 MD |
37 | #include <lib/bitfield.h> |
38 | #include <wrapper/tracepoint.h> | |
39 | #include <wrapper/file.h> | |
40 | #include <wrapper/rcu.h> | |
2230bf69 | 41 | #include <wrapper/syscall.h> |
241ae9a8 | 42 | #include <lttng-events.h> |
259b6cb3 | 43 | |
6333ace3 | 44 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
45 | # ifndef is_compat_task |
46 | # define is_compat_task() (0) | |
47 | # endif | |
6333ace3 MD |
48 | #endif |
49 | ||
1aa3298b MD |
50 | /* in_compat_syscall appears in kernel 4.6. */ |
51 | #ifndef in_compat_syscall | |
52 | #define in_compat_syscall() is_compat_task() | |
53 | #endif | |
54 | ||
5b7ac358 MD |
55 | enum sc_type { |
56 | SC_TYPE_ENTRY, | |
57 | SC_TYPE_EXIT, | |
58 | SC_TYPE_COMPAT_ENTRY, | |
59 | SC_TYPE_COMPAT_EXIT, | |
60 | }; | |
61 | ||
d4291869 MD |
62 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
63 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
64 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
65 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
66 | ||
67 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
68 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
69 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
70 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 71 | |
a93244f8 | 72 | static |
2faf7d1b | 73 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
74 | static |
75 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 76 | |
3a523f5b MD |
77 | /* |
78 | * Forward declarations for old kernels. | |
79 | */ | |
80 | struct mmsghdr; | |
81 | struct rlimit64; | |
82 | struct oldold_utsname; | |
83 | struct old_utsname; | |
84 | struct sel_arg_struct; | |
85 | struct mmap_arg_struct; | |
c0b71117 | 86 | struct file_handle; |
a292e6f1 | 87 | struct user_msghdr; |
3a523f5b | 88 | |
f90c9fdf MJ |
89 | /* |
90 | * Forward declaration for kernels >= 5.6 | |
91 | */ | |
92 | struct timex; | |
0e935eae MJ |
93 | struct timeval; |
94 | struct itimerval; | |
95 | struct itimerspec; | |
96 | ||
97 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
98 | typedef __kernel_old_time_t time_t; | |
99 | #endif | |
f90c9fdf | 100 | |
80f87dd2 MD |
101 | #ifdef IA32_NR_syscalls |
102 | #define NR_compat_syscalls IA32_NR_syscalls | |
103 | #else | |
104 | #define NR_compat_syscalls NR_syscalls | |
105 | #endif | |
106 | ||
259b6cb3 MD |
107 | /* |
108 | * Create LTTng tracepoint probes. | |
109 | */ | |
110 | #define LTTNG_PACKAGE_BUILD | |
111 | #define CREATE_TRACE_POINTS | |
2655f9ad | 112 | #define TP_MODULE_NOINIT |
c075712b | 113 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 114 | |
a93244f8 MD |
115 | #define PARAMS(args...) args |
116 | ||
5b7ac358 | 117 | /* Handle unknown syscalls */ |
72a52753 | 118 | #undef TRACE_SYSTEM |
5b7ac358 | 119 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 120 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
121 | #undef TRACE_SYSTEM |
122 | ||
fc4f7161 MD |
123 | #define SC_ENTER |
124 | ||
fc4f7161 MD |
125 | #undef sc_exit |
126 | #define sc_exit(...) | |
b75d00c4 MD |
127 | #undef sc_in |
128 | #define sc_in(...) __VA_ARGS__ | |
129 | #undef sc_out | |
130 | #define sc_out(...) | |
131 | #undef sc_inout | |
132 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
133 | |
134 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 135 | #undef TP_PROBE_CB |
259b6cb3 | 136 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 137 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 138 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 139 | PARAMS(_fields)) |
265822ae | 140 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 141 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
142 | PARAMS(_locvar), PARAMS(_code_pre), \ |
143 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
144 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
145 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 146 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 147 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
148 | /* Enumerations only defined at first inclusion. */ |
149 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
150 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 151 | #undef TRACE_SYSTEM |
d4291869 | 152 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 153 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 154 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 155 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 156 | #undef TRACE_SYSTEM |
d4291869 | 157 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 158 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 159 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 160 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 161 | #undef TRACE_SYSTEM |
141ddf28 | 162 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
163 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
164 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
165 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
166 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 167 | #undef TP_PROBE_CB |
3bc29f0a MD |
168 | #undef _TRACE_SYSCALLS_INTEGERS_H |
169 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
170 | |
171 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 172 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
771af27e | 173 | #define LTTNG_SC_COMPAT |
57ede728 | 174 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 175 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 176 | PARAMS(_fields)) |
265822ae | 177 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 178 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 179 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
180 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
181 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 182 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
183 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
184 | compat_syscall_entry_##_name) | |
141ddf28 MD |
185 | /* Enumerations only defined at inital inclusion (not here). */ |
186 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 187 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 188 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 189 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
190 | #undef TRACE_INCLUDE_FILE |
191 | #undef TRACE_SYSTEM | |
d4291869 | 192 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 193 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 194 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
195 | #undef TRACE_INCLUDE_FILE |
196 | #undef TRACE_SYSTEM | |
141ddf28 | 197 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
198 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
199 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
200 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
201 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 202 | #undef TP_PROBE_CB |
3bc29f0a MD |
203 | #undef _TRACE_SYSCALLS_INTEGERS_H |
204 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 205 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 206 | |
fc4f7161 MD |
207 | #undef SC_ENTER |
208 | ||
209 | #define SC_EXIT | |
210 | ||
fc4f7161 MD |
211 | #undef sc_exit |
212 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
213 | #undef sc_in |
214 | #define sc_in(...) | |
215 | #undef sc_out | |
216 | #define sc_out(...) __VA_ARGS__ | |
217 | #undef sc_inout | |
218 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
219 | |
220 | /* Hijack probe callback for system call exit */ | |
221 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 222 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 223 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 224 | PARAMS(_fields)) |
265822ae | 225 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 226 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 227 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
228 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
229 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
230 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
231 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 232 | syscall_exit_##_name) |
141ddf28 MD |
233 | /* Enumerations only defined at inital inclusion (not here). */ |
234 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
235 | #define TRACE_SYSTEM syscall_exit_integers |
236 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 237 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
238 | #undef TRACE_INCLUDE_FILE |
239 | #undef TRACE_SYSTEM | |
240 | #define TRACE_SYSTEM syscall_exit_pointers | |
241 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 242 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
243 | #undef TRACE_INCLUDE_FILE |
244 | #undef TRACE_SYSTEM | |
141ddf28 | 245 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
246 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
247 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
248 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
249 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 250 | #undef TP_PROBE_CB |
3bc29f0a MD |
251 | #undef _TRACE_SYSCALLS_INTEGERS_H |
252 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
253 | |
254 | ||
255 | /* Hijack probe callback for compat system call exit */ | |
256 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
771af27e | 257 | #define LTTNG_SC_COMPAT |
57ede728 | 258 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 259 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 260 | PARAMS(_fields)) |
265822ae | 261 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 262 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 263 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
264 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
265 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 266 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 267 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 268 | compat_syscall_exit_##_name) |
141ddf28 MD |
269 | /* Enumerations only defined at inital inclusion (not here). */ |
270 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
271 | #define TRACE_SYSTEM compat_syscall_exit_integers |
272 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 273 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 274 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 275 | #undef TRACE_SYSTEM |
5b7ac358 MD |
276 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
277 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 278 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 279 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 280 | #undef TRACE_SYSTEM |
141ddf28 | 281 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
282 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
283 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
284 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
285 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 286 | #undef TP_PROBE_CB |
3bc29f0a MD |
287 | #undef _TRACE_SYSCALLS_INTEGERS_H |
288 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 289 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 290 | |
fc4f7161 | 291 | #undef SC_EXIT |
259b6cb3 | 292 | |
2655f9ad | 293 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
294 | #undef LTTNG_PACKAGE_BUILD |
295 | #undef CREATE_TRACE_POINTS | |
296 | ||
a93244f8 MD |
297 | struct trace_syscall_entry { |
298 | void *func; | |
299 | const struct lttng_event_desc *desc; | |
300 | const struct lttng_event_field *fields; | |
301 | unsigned int nrargs; | |
302 | }; | |
303 | ||
304 | #define CREATE_SYSCALL_TABLE | |
305 | ||
fc4f7161 MD |
306 | #define SC_ENTER |
307 | ||
308 | #undef sc_exit | |
309 | #define sc_exit(...) | |
310 | ||
259b6cb3 | 311 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 312 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 313 | [ _nr ] = { \ |
d4291869 | 314 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 315 | .nrargs = (_nrargs), \ |
d4291869 MD |
316 | .fields = __event_fields___syscall_entry_##_template, \ |
317 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
318 | }, |
319 | ||
5b7ac358 | 320 | /* Syscall enter tracing table */ |
49c50022 | 321 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
322 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
323 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
324 | }; |
325 | ||
a93244f8 MD |
326 | #undef TRACE_SYSCALL_TABLE |
327 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
328 | [ _nr ] = { \ | |
d4291869 | 329 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 330 | .nrargs = (_nrargs), \ |
d4291869 MD |
331 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
332 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
333 | }, |
334 | ||
5b7ac358 | 335 | /* Compat syscall enter table */ |
a93244f8 | 336 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
337 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
338 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 339 | }; |
259b6cb3 | 340 | |
fc4f7161 MD |
341 | #undef SC_ENTER |
342 | ||
343 | #define SC_EXIT | |
344 | ||
345 | #undef sc_exit | |
346 | #define sc_exit(...) __VA_ARGS__ | |
347 | ||
5b7ac358 MD |
348 | #undef TRACE_SYSCALL_TABLE |
349 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
350 | [ _nr ] = { \ | |
351 | .func = __event_probe__syscall_exit_##_template, \ | |
352 | .nrargs = (_nrargs), \ | |
353 | .fields = __event_fields___syscall_exit_##_template, \ | |
354 | .desc = &__event_desc___syscall_exit_##_name, \ | |
355 | }, | |
356 | ||
357 | /* Syscall exit table */ | |
358 | static const struct trace_syscall_entry sc_exit_table[] = { | |
241ae9a8 MD |
359 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
360 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
361 | }; |
362 | ||
363 | #undef TRACE_SYSCALL_TABLE | |
364 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
365 | [ _nr ] = { \ | |
366 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
367 | .nrargs = (_nrargs), \ | |
368 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
369 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
370 | }, | |
371 | ||
372 | /* Compat syscall exit table */ | |
373 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
241ae9a8 MD |
374 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
375 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
376 | }; |
377 | ||
fc4f7161 MD |
378 | #undef SC_EXIT |
379 | ||
a93244f8 | 380 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 381 | |
80f87dd2 MD |
382 | struct lttng_syscall_filter { |
383 | DECLARE_BITMAP(sc, NR_syscalls); | |
384 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
385 | }; | |
386 | ||
a90917c3 | 387 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
388 | struct pt_regs *regs, unsigned int id) |
389 | { | |
2230bf69 | 390 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 391 | |
2230bf69 | 392 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 393 | if (unlikely(in_compat_syscall())) |
d4291869 | 394 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 395 | else |
d4291869 | 396 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
397 | } |
398 | ||
2faf7d1b | 399 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 400 | { |
a90917c3 MD |
401 | struct lttng_channel *chan = __data; |
402 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
403 | const struct trace_syscall_entry *table, *entry; |
404 | size_t table_len; | |
259b6cb3 | 405 | |
1aa3298b | 406 | if (unlikely(in_compat_syscall())) { |
80f87dd2 MD |
407 | struct lttng_syscall_filter *filter; |
408 | ||
49e2f4c4 | 409 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 410 | if (filter) { |
74f7b56a | 411 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
412 | || !test_bit(id, filter->sc_compat)) { |
413 | /* System call filtered out. */ | |
414 | return; | |
415 | } | |
416 | } | |
49c50022 | 417 | table = compat_sc_table; |
a93244f8 | 418 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
419 | unknown_event = chan->sc_compat_unknown; |
420 | } else { | |
80f87dd2 MD |
421 | struct lttng_syscall_filter *filter; |
422 | ||
49e2f4c4 | 423 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 424 | if (filter) { |
74f7b56a | 425 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
426 | || !test_bit(id, filter->sc)) { |
427 | /* System call filtered out. */ | |
428 | return; | |
429 | } | |
430 | } | |
49c50022 MD |
431 | table = sc_table; |
432 | table_len = ARRAY_SIZE(sc_table); | |
433 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 434 | } |
74f7b56a | 435 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 436 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 437 | return; |
f405cfce | 438 | } |
1aa3298b | 439 | if (unlikely(in_compat_syscall())) |
49c50022 MD |
440 | event = chan->compat_sc_table[id]; |
441 | else | |
442 | event = chan->sc_table[id]; | |
f405cfce | 443 | if (unlikely(!event)) { |
49c50022 | 444 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
445 | return; |
446 | } | |
49c50022 | 447 | entry = &table[id]; |
f405cfce | 448 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
449 | |
450 | switch (entry->nrargs) { | |
451 | case 0: | |
452 | { | |
453 | void (*fptr)(void *__data) = entry->func; | |
454 | ||
455 | fptr(event); | |
456 | break; | |
457 | } | |
458 | case 1: | |
459 | { | |
460 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
2230bf69 | 461 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 462 | |
2230bf69 | 463 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
464 | fptr(event, args[0]); |
465 | break; | |
466 | } | |
467 | case 2: | |
468 | { | |
469 | void (*fptr)(void *__data, | |
470 | unsigned long arg0, | |
471 | unsigned long arg1) = entry->func; | |
2230bf69 | 472 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 473 | |
2230bf69 | 474 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
475 | fptr(event, args[0], args[1]); |
476 | break; | |
477 | } | |
478 | case 3: | |
479 | { | |
480 | void (*fptr)(void *__data, | |
481 | unsigned long arg0, | |
482 | unsigned long arg1, | |
483 | unsigned long arg2) = entry->func; | |
2230bf69 | 484 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 485 | |
2230bf69 | 486 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
487 | fptr(event, args[0], args[1], args[2]); |
488 | break; | |
489 | } | |
490 | case 4: | |
491 | { | |
492 | void (*fptr)(void *__data, | |
493 | unsigned long arg0, | |
494 | unsigned long arg1, | |
495 | unsigned long arg2, | |
496 | unsigned long arg3) = entry->func; | |
2230bf69 | 497 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 498 | |
2230bf69 | 499 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
500 | fptr(event, args[0], args[1], args[2], args[3]); |
501 | break; | |
502 | } | |
503 | case 5: | |
504 | { | |
505 | void (*fptr)(void *__data, | |
506 | unsigned long arg0, | |
507 | unsigned long arg1, | |
508 | unsigned long arg2, | |
509 | unsigned long arg3, | |
510 | unsigned long arg4) = entry->func; | |
2230bf69 | 511 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 512 | |
2230bf69 | 513 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
514 | fptr(event, args[0], args[1], args[2], args[3], args[4]); |
515 | break; | |
516 | } | |
517 | case 6: | |
518 | { | |
519 | void (*fptr)(void *__data, | |
520 | unsigned long arg0, | |
521 | unsigned long arg1, | |
522 | unsigned long arg2, | |
523 | unsigned long arg3, | |
524 | unsigned long arg4, | |
525 | unsigned long arg5) = entry->func; | |
2230bf69 | 526 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 527 | |
2230bf69 | 528 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
529 | fptr(event, args[0], args[1], args[2], |
530 | args[3], args[4], args[5]); | |
531 | break; | |
532 | } | |
533 | default: | |
534 | break; | |
535 | } | |
536 | } | |
537 | ||
5b7ac358 | 538 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 539 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 540 | { |
2230bf69 | 541 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 542 | |
2230bf69 | 543 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 544 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
545 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
546 | args); | |
547 | else | |
548 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
549 | } | |
550 | ||
551 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
552 | { | |
553 | struct lttng_channel *chan = __data; | |
554 | struct lttng_event *event, *unknown_event; | |
555 | const struct trace_syscall_entry *table, *entry; | |
556 | size_t table_len; | |
557 | long id; | |
558 | ||
559 | id = syscall_get_nr(current, regs); | |
1aa3298b | 560 | if (unlikely(in_compat_syscall())) { |
5b7ac358 MD |
561 | struct lttng_syscall_filter *filter; |
562 | ||
49e2f4c4 | 563 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 564 | if (filter) { |
74f7b56a | 565 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
566 | || !test_bit(id, filter->sc_compat)) { |
567 | /* System call filtered out. */ | |
568 | return; | |
569 | } | |
570 | } | |
571 | table = compat_sc_exit_table; | |
572 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
573 | unknown_event = chan->compat_sc_exit_unknown; | |
574 | } else { | |
575 | struct lttng_syscall_filter *filter; | |
576 | ||
49e2f4c4 | 577 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 578 | if (filter) { |
74f7b56a | 579 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
580 | || !test_bit(id, filter->sc)) { |
581 | /* System call filtered out. */ | |
582 | return; | |
583 | } | |
584 | } | |
585 | table = sc_exit_table; | |
586 | table_len = ARRAY_SIZE(sc_exit_table); | |
587 | unknown_event = chan->sc_exit_unknown; | |
588 | } | |
74f7b56a | 589 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
590 | syscall_exit_unknown(unknown_event, regs, id, ret); |
591 | return; | |
592 | } | |
1aa3298b | 593 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
594 | event = chan->compat_sc_exit_table[id]; |
595 | else | |
596 | event = chan->sc_exit_table[id]; | |
597 | if (unlikely(!event)) { | |
598 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
599 | return; | |
600 | } | |
601 | entry = &table[id]; | |
602 | WARN_ON_ONCE(!entry); | |
603 | ||
604 | switch (entry->nrargs) { | |
605 | case 0: | |
606 | { | |
fc4f7161 | 607 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 608 | |
fc4f7161 | 609 | fptr(event, ret); |
5b7ac358 MD |
610 | break; |
611 | } | |
612 | case 1: | |
613 | { | |
614 | void (*fptr)(void *__data, | |
fc4f7161 | 615 | long ret, |
5b7ac358 | 616 | unsigned long arg0) = entry->func; |
2230bf69 | 617 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 618 | |
2230bf69 | 619 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 620 | fptr(event, ret, args[0]); |
5b7ac358 MD |
621 | break; |
622 | } | |
623 | case 2: | |
624 | { | |
625 | void (*fptr)(void *__data, | |
fc4f7161 | 626 | long ret, |
5b7ac358 MD |
627 | unsigned long arg0, |
628 | unsigned long arg1) = entry->func; | |
2230bf69 | 629 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 630 | |
2230bf69 | 631 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 632 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
633 | break; |
634 | } | |
635 | case 3: | |
636 | { | |
637 | void (*fptr)(void *__data, | |
fc4f7161 | 638 | long ret, |
5b7ac358 MD |
639 | unsigned long arg0, |
640 | unsigned long arg1, | |
641 | unsigned long arg2) = entry->func; | |
2230bf69 | 642 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 643 | |
2230bf69 | 644 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 645 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
646 | break; |
647 | } | |
648 | case 4: | |
649 | { | |
650 | void (*fptr)(void *__data, | |
fc4f7161 | 651 | long ret, |
5b7ac358 MD |
652 | unsigned long arg0, |
653 | unsigned long arg1, | |
654 | unsigned long arg2, | |
655 | unsigned long arg3) = entry->func; | |
2230bf69 | 656 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 657 | |
2230bf69 | 658 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 659 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
660 | break; |
661 | } | |
662 | case 5: | |
663 | { | |
664 | void (*fptr)(void *__data, | |
fc4f7161 | 665 | long ret, |
5b7ac358 MD |
666 | unsigned long arg0, |
667 | unsigned long arg1, | |
668 | unsigned long arg2, | |
669 | unsigned long arg3, | |
670 | unsigned long arg4) = entry->func; | |
2230bf69 | 671 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 672 | |
2230bf69 | 673 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 674 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
675 | break; |
676 | } | |
677 | case 6: | |
678 | { | |
679 | void (*fptr)(void *__data, | |
fc4f7161 | 680 | long ret, |
5b7ac358 MD |
681 | unsigned long arg0, |
682 | unsigned long arg1, | |
683 | unsigned long arg2, | |
684 | unsigned long arg3, | |
685 | unsigned long arg4, | |
686 | unsigned long arg5) = entry->func; | |
2230bf69 | 687 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 688 | |
2230bf69 | 689 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 690 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
691 | args[3], args[4], args[5]); |
692 | break; | |
693 | } | |
694 | default: | |
695 | break; | |
696 | } | |
697 | } | |
698 | ||
33a39a3c MD |
699 | /* |
700 | * noinline to diminish caller stack size. | |
701 | * Should be called with sessions lock held. | |
702 | */ | |
49c50022 MD |
703 | static |
704 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
705 | struct lttng_event **chan_table, struct lttng_channel *chan, |
706 | void *filter, enum sc_type type) | |
259b6cb3 | 707 | { |
2a0c4816 | 708 | const struct lttng_event_desc *desc; |
259b6cb3 | 709 | unsigned int i; |
49c50022 MD |
710 | |
711 | /* Allocate events for each syscall, insert into table */ | |
712 | for (i = 0; i < table_len; i++) { | |
713 | struct lttng_kernel_event ev; | |
2a0c4816 | 714 | desc = table[i].desc; |
49c50022 MD |
715 | |
716 | if (!desc) { | |
717 | /* Unknown syscall */ | |
718 | continue; | |
719 | } | |
720 | /* | |
721 | * Skip those already populated by previous failed | |
722 | * register for this channel. | |
723 | */ | |
724 | if (chan_table[i]) | |
725 | continue; | |
726 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
727 | switch (type) { |
728 | case SC_TYPE_ENTRY: | |
729 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
730 | LTTNG_KERNEL_SYM_NAME_LEN); | |
731 | break; | |
732 | case SC_TYPE_EXIT: | |
733 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
734 | LTTNG_KERNEL_SYM_NAME_LEN); | |
735 | break; | |
736 | case SC_TYPE_COMPAT_ENTRY: | |
737 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
738 | LTTNG_KERNEL_SYM_NAME_LEN); | |
739 | break; | |
740 | case SC_TYPE_COMPAT_EXIT: | |
741 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
742 | LTTNG_KERNEL_SYM_NAME_LEN); | |
743 | break; | |
744 | default: | |
745 | BUG_ON(1); | |
746 | break; | |
747 | } | |
748 | strncat(ev.name, desc->name, | |
749 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 750 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
751 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
752 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 753 | desc, ev.instrumentation); |
abc0446a MD |
754 | WARN_ON_ONCE(!chan_table[i]); |
755 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
756 | /* |
757 | * If something goes wrong in event registration | |
758 | * after the first one, we have no choice but to | |
759 | * leave the previous events in there, until | |
760 | * deleted by session teardown. | |
761 | */ | |
abc0446a | 762 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
763 | } |
764 | } | |
765 | return 0; | |
766 | } | |
767 | ||
33a39a3c MD |
768 | /* |
769 | * Should be called with sessions lock held. | |
770 | */ | |
a90917c3 | 771 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 772 | { |
2a0c4816 | 773 | struct lttng_kernel_event ev; |
259b6cb3 MD |
774 | int ret; |
775 | ||
776 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
777 | |
778 | if (!chan->sc_table) { | |
779 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 780 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
781 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
782 | if (!chan->sc_table) | |
783 | return -ENOMEM; | |
784 | } | |
5b7ac358 MD |
785 | if (!chan->sc_exit_table) { |
786 | /* create syscall table mapping syscall to events */ | |
787 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
788 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
789 | if (!chan->sc_exit_table) | |
790 | return -ENOMEM; | |
791 | } | |
792 | ||
259b6cb3 | 793 | |
49c50022 MD |
794 | #ifdef CONFIG_COMPAT |
795 | if (!chan->compat_sc_table) { | |
796 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 797 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 798 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
799 | if (!chan->compat_sc_table) |
800 | return -ENOMEM; | |
801 | } | |
5b7ac358 MD |
802 | |
803 | if (!chan->compat_sc_exit_table) { | |
804 | /* create syscall table mapping compat syscall to events */ | |
805 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
806 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
807 | if (!chan->compat_sc_exit_table) | |
808 | return -ENOMEM; | |
809 | } | |
49c50022 | 810 | #endif |
f405cfce | 811 | if (!chan->sc_unknown) { |
f405cfce | 812 | const struct lttng_event_desc *desc = |
d4291869 | 813 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 814 | |
f405cfce | 815 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
816 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
817 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
818 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
819 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
820 | desc, |
821 | ev.instrumentation); | |
abc0446a MD |
822 | WARN_ON_ONCE(!chan->sc_unknown); |
823 | if (IS_ERR(chan->sc_unknown)) { | |
824 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
825 | } |
826 | } | |
827 | ||
b76dc1a0 | 828 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 829 | const struct lttng_event_desc *desc = |
d4291869 | 830 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
831 | |
832 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
833 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
834 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
835 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
836 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
837 | desc, |
838 | ev.instrumentation); | |
abc0446a MD |
839 | WARN_ON_ONCE(!chan->sc_unknown); |
840 | if (IS_ERR(chan->sc_compat_unknown)) { | |
841 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
842 | } |
843 | } | |
844 | ||
5b7ac358 | 845 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 846 | const struct lttng_event_desc *desc = |
5b7ac358 | 847 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
848 | |
849 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
850 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
851 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
852 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
853 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, | |
3c997079 MD |
854 | filter, desc, |
855 | ev.instrumentation); | |
5b7ac358 MD |
856 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
857 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
858 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
859 | } | |
860 | } | |
861 | ||
862 | if (!chan->sc_exit_unknown) { | |
863 | const struct lttng_event_desc *desc = | |
864 | &__event_desc___syscall_exit_unknown; | |
865 | ||
866 | memset(&ev, 0, sizeof(ev)); | |
867 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
868 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
869 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
870 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 871 | desc, ev.instrumentation); |
5b7ac358 MD |
872 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
873 | if (IS_ERR(chan->sc_exit_unknown)) { | |
874 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
875 | } |
876 | } | |
877 | ||
49c50022 | 878 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
879 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
880 | if (ret) | |
881 | return ret; | |
882 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
883 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
884 | if (ret) |
885 | return ret; | |
5b7ac358 | 886 | |
49c50022 | 887 | #ifdef CONFIG_COMPAT |
a93244f8 | 888 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
889 | chan->compat_sc_table, chan, filter, |
890 | SC_TYPE_COMPAT_ENTRY); | |
891 | if (ret) | |
892 | return ret; | |
893 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
894 | chan->compat_sc_exit_table, chan, filter, | |
895 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
896 | if (ret) |
897 | return ret; | |
898 | #endif | |
80f87dd2 MD |
899 | if (!chan->sys_enter_registered) { |
900 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
901 | (void *) syscall_entry_probe, chan); | |
902 | if (ret) | |
903 | return ret; | |
904 | chan->sys_enter_registered = 1; | |
905 | } | |
63728b02 MD |
906 | /* |
907 | * We change the name of sys_exit tracepoint due to namespace | |
908 | * conflict with sys_exit syscall entry. | |
909 | */ | |
80f87dd2 MD |
910 | if (!chan->sys_exit_registered) { |
911 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 912 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
913 | if (ret) { |
914 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
915 | (void *) syscall_entry_probe, chan)); | |
916 | return ret; | |
917 | } | |
918 | chan->sys_exit_registered = 1; | |
63728b02 | 919 | } |
259b6cb3 MD |
920 | return ret; |
921 | } | |
922 | ||
923 | /* | |
924 | * Only called at session destruction. | |
925 | */ | |
a90917c3 | 926 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
927 | { |
928 | int ret; | |
929 | ||
930 | if (!chan->sc_table) | |
931 | return 0; | |
80f87dd2 | 932 | if (chan->sys_enter_registered) { |
b276cb13 FD |
933 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
934 | (void *) syscall_entry_probe, chan); | |
80f87dd2 MD |
935 | if (ret) |
936 | return ret; | |
937 | chan->sys_enter_registered = 0; | |
938 | } | |
939 | if (chan->sys_exit_registered) { | |
b276cb13 FD |
940 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
941 | (void *) syscall_exit_probe, chan); | |
80f87dd2 MD |
942 | if (ret) |
943 | return ret; | |
944 | chan->sys_exit_registered = 0; | |
945 | } | |
a90917c3 | 946 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 947 | kfree(chan->sc_table); |
5b7ac358 | 948 | kfree(chan->sc_exit_table); |
49c50022 MD |
949 | #ifdef CONFIG_COMPAT |
950 | kfree(chan->compat_sc_table); | |
5b7ac358 | 951 | kfree(chan->compat_sc_exit_table); |
49c50022 | 952 | #endif |
80f87dd2 MD |
953 | kfree(chan->sc_filter); |
954 | return 0; | |
955 | } | |
956 | ||
957 | static | |
958 | int get_syscall_nr(const char *syscall_name) | |
959 | { | |
960 | int syscall_nr = -1; | |
961 | int i; | |
962 | ||
963 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
964 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 965 | const char *it_name; |
80f87dd2 MD |
966 | |
967 | entry = &sc_table[i]; | |
968 | if (!entry->desc) | |
969 | continue; | |
5b7ac358 MD |
970 | it_name = entry->desc->name; |
971 | it_name += strlen(SYSCALL_ENTRY_STR); | |
972 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
973 | syscall_nr = i; |
974 | break; | |
975 | } | |
976 | } | |
977 | return syscall_nr; | |
978 | } | |
979 | ||
980 | static | |
981 | int get_compat_syscall_nr(const char *syscall_name) | |
982 | { | |
983 | int syscall_nr = -1; | |
984 | int i; | |
985 | ||
986 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
987 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 988 | const char *it_name; |
80f87dd2 MD |
989 | |
990 | entry = &compat_sc_table[i]; | |
991 | if (!entry->desc) | |
992 | continue; | |
5b7ac358 MD |
993 | it_name = entry->desc->name; |
994 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
995 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
996 | syscall_nr = i; |
997 | break; | |
998 | } | |
999 | } | |
1000 | return syscall_nr; | |
1001 | } | |
1002 | ||
12e579db MD |
1003 | static |
1004 | uint32_t get_sc_tables_len(void) | |
1005 | { | |
1006 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1007 | } | |
1008 | ||
80f87dd2 MD |
1009 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
1010 | const char *name) | |
1011 | { | |
1012 | int syscall_nr, compat_syscall_nr, ret; | |
1013 | struct lttng_syscall_filter *filter; | |
1014 | ||
1015 | WARN_ON_ONCE(!chan->sc_table); | |
1016 | ||
1017 | if (!name) { | |
1018 | /* Enable all system calls by removing filter */ | |
1019 | if (chan->sc_filter) { | |
1020 | filter = chan->sc_filter; | |
1021 | rcu_assign_pointer(chan->sc_filter, NULL); | |
1022 | synchronize_trace(); | |
1023 | kfree(filter); | |
1024 | } | |
1025 | chan->syscall_all = 1; | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | if (!chan->sc_filter) { | |
1030 | if (chan->syscall_all) { | |
1031 | /* | |
1032 | * All syscalls are already enabled. | |
1033 | */ | |
1034 | return -EEXIST; | |
1035 | } | |
1036 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1037 | GFP_KERNEL); | |
1038 | if (!filter) | |
1039 | return -ENOMEM; | |
1040 | } else { | |
1041 | filter = chan->sc_filter; | |
1042 | } | |
1043 | syscall_nr = get_syscall_nr(name); | |
1044 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1045 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1046 | ret = -ENOENT; | |
1047 | goto error; | |
1048 | } | |
1049 | if (syscall_nr >= 0) { | |
1050 | if (test_bit(syscall_nr, filter->sc)) { | |
1051 | ret = -EEXIST; | |
1052 | goto error; | |
1053 | } | |
1054 | bitmap_set(filter->sc, syscall_nr, 1); | |
1055 | } | |
1056 | if (compat_syscall_nr >= 0) { | |
1057 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1058 | ret = -EEXIST; | |
1059 | goto error; | |
1060 | } | |
1061 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1062 | } | |
1063 | if (!chan->sc_filter) | |
1064 | rcu_assign_pointer(chan->sc_filter, filter); | |
1065 | return 0; | |
1066 | ||
1067 | error: | |
1068 | if (!chan->sc_filter) | |
1069 | kfree(filter); | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1074 | const char *name) | |
1075 | { | |
1076 | int syscall_nr, compat_syscall_nr, ret; | |
1077 | struct lttng_syscall_filter *filter; | |
1078 | ||
1079 | WARN_ON_ONCE(!chan->sc_table); | |
1080 | ||
1081 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1082 | if (!chan->syscall_all) |
1083 | return -EEXIST; | |
80f87dd2 MD |
1084 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1085 | GFP_KERNEL); | |
1086 | if (!filter) | |
1087 | return -ENOMEM; | |
1088 | /* Trace all system calls, then apply disable. */ | |
1089 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1090 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1091 | } else { | |
1092 | filter = chan->sc_filter; | |
1093 | } | |
1094 | ||
72814741 | 1095 | if (!name) { |
404e87bf MD |
1096 | /* Fail if all syscalls are already disabled. */ |
1097 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1098 | && bitmap_empty(filter->sc_compat, | |
1099 | NR_compat_syscalls)) { | |
1100 | ret = -EEXIST; | |
1101 | goto error; | |
1102 | } | |
1103 | ||
72814741 MD |
1104 | /* Disable all system calls */ |
1105 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1106 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1107 | goto apply_filter; | |
1108 | } | |
80f87dd2 MD |
1109 | syscall_nr = get_syscall_nr(name); |
1110 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1111 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1112 | ret = -ENOENT; | |
1113 | goto error; | |
1114 | } | |
1115 | if (syscall_nr >= 0) { | |
cecef7f8 | 1116 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1117 | ret = -EEXIST; |
1118 | goto error; | |
1119 | } | |
cecef7f8 | 1120 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1121 | } |
1122 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1123 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1124 | ret = -EEXIST; |
1125 | goto error; | |
1126 | } | |
cecef7f8 | 1127 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1128 | } |
72814741 | 1129 | apply_filter: |
80f87dd2 MD |
1130 | if (!chan->sc_filter) |
1131 | rcu_assign_pointer(chan->sc_filter, filter); | |
1132 | chan->syscall_all = 0; | |
259b6cb3 | 1133 | return 0; |
80f87dd2 MD |
1134 | |
1135 | error: | |
1136 | if (!chan->sc_filter) | |
1137 | kfree(filter); | |
1138 | return ret; | |
259b6cb3 | 1139 | } |
2d2464bd MD |
1140 | |
1141 | static | |
1142 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1143 | { | |
1144 | const struct trace_syscall_entry *entry; | |
1145 | int iter = 0; | |
1146 | ||
1147 | for (entry = sc_table; | |
1148 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1149 | entry++) { | |
1150 | if (iter++ >= *pos) | |
1151 | return entry; | |
1152 | } | |
1153 | for (entry = compat_sc_table; | |
1154 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1155 | entry++) { | |
1156 | if (iter++ >= *pos) | |
1157 | return entry; | |
1158 | } | |
1159 | /* End of list */ | |
1160 | return NULL; | |
1161 | } | |
1162 | ||
1163 | static | |
1164 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1165 | { | |
1166 | return (void *) syscall_list_get_entry(pos); | |
1167 | } | |
1168 | ||
1169 | static | |
1170 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1171 | { | |
1172 | (*ppos)++; | |
1173 | return (void *) syscall_list_get_entry(ppos); | |
1174 | } | |
1175 | ||
1176 | static | |
1177 | void syscall_list_stop(struct seq_file *m, void *p) | |
1178 | { | |
1179 | } | |
1180 | ||
12e579db MD |
1181 | static |
1182 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1183 | const struct trace_syscall_entry **table, | |
1184 | unsigned int *bitness) | |
1185 | { | |
1186 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1187 | if (bitness) | |
1188 | *bitness = BITS_PER_LONG; | |
1189 | if (table) | |
1190 | *table = sc_table; | |
1191 | return 0; | |
1192 | } | |
1193 | if (!(entry >= compat_sc_table | |
1194 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1195 | return -EINVAL; | |
1196 | } | |
1197 | if (bitness) | |
1198 | *bitness = 32; | |
1199 | if (table) | |
1200 | *table = compat_sc_table; | |
1201 | return 0; | |
1202 | } | |
1203 | ||
2d2464bd MD |
1204 | static |
1205 | int syscall_list_show(struct seq_file *m, void *p) | |
1206 | { | |
1207 | const struct trace_syscall_entry *table, *entry = p; | |
1208 | unsigned int bitness; | |
d4291869 | 1209 | unsigned long index; |
12e579db | 1210 | int ret; |
d4291869 | 1211 | const char *name; |
2d2464bd | 1212 | |
12e579db MD |
1213 | ret = get_sc_table(entry, &table, &bitness); |
1214 | if (ret) | |
1215 | return ret; | |
f4855b46 MD |
1216 | if (!entry->desc) |
1217 | return 0; | |
d4291869 MD |
1218 | if (table == sc_table) { |
1219 | index = entry - table; | |
1220 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1221 | } else { | |
1222 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1223 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1224 | } | |
12e579db | 1225 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1226 | index, name, bitness); |
2d2464bd MD |
1227 | return 0; |
1228 | } | |
1229 | ||
1230 | static | |
1231 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1232 | .start = syscall_list_start, | |
1233 | .next = syscall_list_next, | |
1234 | .stop = syscall_list_stop, | |
1235 | .show = syscall_list_show, | |
1236 | }; | |
1237 | ||
1238 | static | |
1239 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1240 | { | |
1241 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1242 | } | |
1243 | ||
1244 | const struct file_operations lttng_syscall_list_fops = { | |
1245 | .owner = THIS_MODULE, | |
1246 | .open = lttng_syscall_list_open, | |
1247 | .read = seq_read, | |
1248 | .llseek = seq_lseek, | |
1249 | .release = seq_release, | |
1250 | }; | |
12e579db MD |
1251 | |
1252 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1253 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1254 | { | |
1255 | uint32_t len, sc_tables_len, bitmask_len; | |
1256 | int ret = 0, bit; | |
1257 | char *tmp_mask; | |
1258 | struct lttng_syscall_filter *filter; | |
1259 | ||
1260 | ret = get_user(len, &usyscall_mask->len); | |
1261 | if (ret) | |
1262 | return ret; | |
1263 | sc_tables_len = get_sc_tables_len(); | |
1264 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1265 | if (len < sc_tables_len) { | |
1266 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1267 | } | |
1268 | /* Array is large enough, we can copy array to user-space. */ | |
1269 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1270 | if (!tmp_mask) | |
1271 | return -ENOMEM; | |
1272 | filter = channel->sc_filter; | |
1273 | ||
1274 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
8aa41af5 | 1275 | char state; |
2f25059d MD |
1276 | |
1277 | if (channel->sc_table) { | |
1278 | if (filter) | |
1279 | state = test_bit(bit, filter->sc); | |
1280 | else | |
1281 | state = 1; | |
1282 | } else { | |
1283 | state = 0; | |
1284 | } | |
1285 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1286 | } |
1287 | for (; bit < sc_tables_len; bit++) { | |
8aa41af5 | 1288 | char state; |
2f25059d MD |
1289 | |
1290 | if (channel->compat_sc_table) { | |
1291 | if (filter) | |
1292 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1293 | filter->sc_compat); | |
1294 | else | |
1295 | state = 1; | |
1296 | } else { | |
1297 | state = 0; | |
1298 | } | |
1299 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1300 | } |
1301 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1302 | ret = -EFAULT; | |
1303 | kfree(tmp_mask); | |
1304 | return ret; | |
1305 | } | |
082d4946 MD |
1306 | |
1307 | int lttng_abi_syscall_list(void) | |
1308 | { | |
1309 | struct file *syscall_list_file; | |
1310 | int file_fd, ret; | |
1311 | ||
4ac10b76 | 1312 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1313 | if (file_fd < 0) { |
1314 | ret = file_fd; | |
1315 | goto fd_error; | |
1316 | } | |
1317 | ||
1318 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1319 | <tng_syscall_list_fops, | |
1320 | NULL, O_RDWR); | |
1321 | if (IS_ERR(syscall_list_file)) { | |
1322 | ret = PTR_ERR(syscall_list_file); | |
1323 | goto file_error; | |
1324 | } | |
1325 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1326 | if (ret < 0) | |
1327 | goto open_error; | |
1328 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1329 | return file_fd; |
1330 | ||
1331 | open_error: | |
1332 | fput(syscall_list_file); | |
1333 | file_error: | |
1334 | put_unused_fd(file_fd); | |
1335 | fd_error: | |
1336 | return ret; | |
1337 | } |