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> | |
b75b8603 | 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 | |
80f87dd2 MD |
89 | #ifdef IA32_NR_syscalls |
90 | #define NR_compat_syscalls IA32_NR_syscalls | |
91 | #else | |
92 | #define NR_compat_syscalls NR_syscalls | |
93 | #endif | |
94 | ||
259b6cb3 MD |
95 | /* |
96 | * Create LTTng tracepoint probes. | |
97 | */ | |
98 | #define LTTNG_PACKAGE_BUILD | |
99 | #define CREATE_TRACE_POINTS | |
2655f9ad | 100 | #define TP_MODULE_NOINIT |
c075712b | 101 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 102 | |
a93244f8 MD |
103 | #define PARAMS(args...) args |
104 | ||
5b7ac358 | 105 | /* Handle unknown syscalls */ |
72a52753 | 106 | #undef TRACE_SYSTEM |
5b7ac358 | 107 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 108 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
109 | #undef TRACE_SYSTEM |
110 | ||
fc4f7161 MD |
111 | #define SC_ENTER |
112 | ||
fc4f7161 MD |
113 | #undef sc_exit |
114 | #define sc_exit(...) | |
b75d00c4 MD |
115 | #undef sc_in |
116 | #define sc_in(...) __VA_ARGS__ | |
117 | #undef sc_out | |
118 | #define sc_out(...) | |
119 | #undef sc_inout | |
120 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
121 | |
122 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 123 | #undef TP_PROBE_CB |
259b6cb3 | 124 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 125 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 126 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 127 | PARAMS(_fields)) |
265822ae | 128 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 129 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
130 | PARAMS(_locvar), PARAMS(_code_pre), \ |
131 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
132 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
133 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 134 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 135 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
136 | /* Enumerations only defined at first inclusion. */ |
137 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
138 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 139 | #undef TRACE_SYSTEM |
d4291869 | 140 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 141 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 142 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 143 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 144 | #undef TRACE_SYSTEM |
d4291869 | 145 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 146 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 147 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 148 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 149 | #undef TRACE_SYSTEM |
141ddf28 | 150 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
151 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
152 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
153 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
154 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 155 | #undef TP_PROBE_CB |
3bc29f0a MD |
156 | #undef _TRACE_SYSCALLS_INTEGERS_H |
157 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
158 | |
159 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 160 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 161 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 162 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 163 | PARAMS(_fields)) |
265822ae | 164 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 165 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 166 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
167 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
168 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 169 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
170 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
171 | compat_syscall_entry_##_name) | |
141ddf28 MD |
172 | /* Enumerations only defined at inital inclusion (not here). */ |
173 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 174 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 175 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 176 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
177 | #undef TRACE_INCLUDE_FILE |
178 | #undef TRACE_SYSTEM | |
d4291869 | 179 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 180 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 181 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
182 | #undef TRACE_INCLUDE_FILE |
183 | #undef TRACE_SYSTEM | |
141ddf28 | 184 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
185 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
186 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
187 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
188 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 189 | #undef TP_PROBE_CB |
3bc29f0a MD |
190 | #undef _TRACE_SYSCALLS_INTEGERS_H |
191 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 192 | |
fc4f7161 MD |
193 | #undef SC_ENTER |
194 | ||
195 | #define SC_EXIT | |
196 | ||
fc4f7161 MD |
197 | #undef sc_exit |
198 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
199 | #undef sc_in |
200 | #define sc_in(...) | |
201 | #undef sc_out | |
202 | #define sc_out(...) __VA_ARGS__ | |
203 | #undef sc_inout | |
204 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
205 | |
206 | /* Hijack probe callback for system call exit */ | |
207 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 208 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 209 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 210 | PARAMS(_fields)) |
265822ae | 211 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 212 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 213 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
214 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
215 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
216 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
217 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 218 | syscall_exit_##_name) |
141ddf28 MD |
219 | /* Enumerations only defined at inital inclusion (not here). */ |
220 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
221 | #define TRACE_SYSTEM syscall_exit_integers |
222 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 223 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
224 | #undef TRACE_INCLUDE_FILE |
225 | #undef TRACE_SYSTEM | |
226 | #define TRACE_SYSTEM syscall_exit_pointers | |
227 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 228 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
229 | #undef TRACE_INCLUDE_FILE |
230 | #undef TRACE_SYSTEM | |
141ddf28 | 231 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
232 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
233 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
234 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
235 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 236 | #undef TP_PROBE_CB |
3bc29f0a MD |
237 | #undef _TRACE_SYSCALLS_INTEGERS_H |
238 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
239 | |
240 | ||
241 | /* Hijack probe callback for compat system call exit */ | |
242 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 243 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 244 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 245 | PARAMS(_fields)) |
265822ae | 246 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 247 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 248 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
249 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
250 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 251 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 252 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 253 | compat_syscall_exit_##_name) |
141ddf28 MD |
254 | /* Enumerations only defined at inital inclusion (not here). */ |
255 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
256 | #define TRACE_SYSTEM compat_syscall_exit_integers |
257 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 258 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 259 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 260 | #undef TRACE_SYSTEM |
5b7ac358 MD |
261 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
262 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 263 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 264 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 265 | #undef TRACE_SYSTEM |
141ddf28 | 266 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
267 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
268 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
269 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
270 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 271 | #undef TP_PROBE_CB |
3bc29f0a MD |
272 | #undef _TRACE_SYSCALLS_INTEGERS_H |
273 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 274 | |
fc4f7161 | 275 | #undef SC_EXIT |
259b6cb3 | 276 | |
2655f9ad | 277 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
278 | #undef LTTNG_PACKAGE_BUILD |
279 | #undef CREATE_TRACE_POINTS | |
280 | ||
a93244f8 MD |
281 | struct trace_syscall_entry { |
282 | void *func; | |
283 | const struct lttng_event_desc *desc; | |
284 | const struct lttng_event_field *fields; | |
285 | unsigned int nrargs; | |
286 | }; | |
287 | ||
288 | #define CREATE_SYSCALL_TABLE | |
289 | ||
fc4f7161 MD |
290 | #define SC_ENTER |
291 | ||
292 | #undef sc_exit | |
293 | #define sc_exit(...) | |
294 | ||
259b6cb3 | 295 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 296 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 297 | [ _nr ] = { \ |
d4291869 | 298 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 299 | .nrargs = (_nrargs), \ |
d4291869 MD |
300 | .fields = __event_fields___syscall_entry_##_template, \ |
301 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
302 | }, |
303 | ||
5b7ac358 | 304 | /* Syscall enter tracing table */ |
49c50022 | 305 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
306 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
307 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
308 | }; |
309 | ||
a93244f8 MD |
310 | #undef TRACE_SYSCALL_TABLE |
311 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
312 | [ _nr ] = { \ | |
d4291869 | 313 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 314 | .nrargs = (_nrargs), \ |
d4291869 MD |
315 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
316 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
317 | }, |
318 | ||
5b7ac358 | 319 | /* Compat syscall enter table */ |
a93244f8 | 320 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
321 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
322 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 323 | }; |
259b6cb3 | 324 | |
fc4f7161 MD |
325 | #undef SC_ENTER |
326 | ||
327 | #define SC_EXIT | |
328 | ||
329 | #undef sc_exit | |
330 | #define sc_exit(...) __VA_ARGS__ | |
331 | ||
5b7ac358 MD |
332 | #undef TRACE_SYSCALL_TABLE |
333 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
334 | [ _nr ] = { \ | |
335 | .func = __event_probe__syscall_exit_##_template, \ | |
336 | .nrargs = (_nrargs), \ | |
337 | .fields = __event_fields___syscall_exit_##_template, \ | |
338 | .desc = &__event_desc___syscall_exit_##_name, \ | |
339 | }, | |
340 | ||
341 | /* Syscall exit table */ | |
342 | static const struct trace_syscall_entry sc_exit_table[] = { | |
241ae9a8 MD |
343 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
344 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
345 | }; |
346 | ||
347 | #undef TRACE_SYSCALL_TABLE | |
348 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
349 | [ _nr ] = { \ | |
350 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
351 | .nrargs = (_nrargs), \ | |
352 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
353 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
354 | }, | |
355 | ||
356 | /* Compat syscall exit table */ | |
357 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
241ae9a8 MD |
358 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
359 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
360 | }; |
361 | ||
fc4f7161 MD |
362 | #undef SC_EXIT |
363 | ||
a93244f8 | 364 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 365 | |
80f87dd2 MD |
366 | struct lttng_syscall_filter { |
367 | DECLARE_BITMAP(sc, NR_syscalls); | |
368 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
369 | }; | |
370 | ||
a90917c3 | 371 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
372 | struct pt_regs *regs, unsigned int id) |
373 | { | |
b75b8603 | 374 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 375 | |
b75b8603 | 376 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 377 | if (unlikely(in_compat_syscall())) |
d4291869 | 378 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 379 | else |
d4291869 | 380 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
381 | } |
382 | ||
2faf7d1b | 383 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 384 | { |
a90917c3 MD |
385 | struct lttng_channel *chan = __data; |
386 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
387 | const struct trace_syscall_entry *table, *entry; |
388 | size_t table_len; | |
259b6cb3 | 389 | |
1aa3298b | 390 | if (unlikely(in_compat_syscall())) { |
80f87dd2 MD |
391 | struct lttng_syscall_filter *filter; |
392 | ||
49e2f4c4 | 393 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 394 | if (filter) { |
74f7b56a | 395 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
396 | || !test_bit(id, filter->sc_compat)) { |
397 | /* System call filtered out. */ | |
398 | return; | |
399 | } | |
400 | } | |
49c50022 | 401 | table = compat_sc_table; |
a93244f8 | 402 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
403 | unknown_event = chan->sc_compat_unknown; |
404 | } else { | |
80f87dd2 MD |
405 | struct lttng_syscall_filter *filter; |
406 | ||
49e2f4c4 | 407 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 408 | if (filter) { |
74f7b56a | 409 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
410 | || !test_bit(id, filter->sc)) { |
411 | /* System call filtered out. */ | |
412 | return; | |
413 | } | |
414 | } | |
49c50022 MD |
415 | table = sc_table; |
416 | table_len = ARRAY_SIZE(sc_table); | |
417 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 418 | } |
74f7b56a | 419 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 420 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 421 | return; |
f405cfce | 422 | } |
1aa3298b | 423 | if (unlikely(in_compat_syscall())) |
49c50022 MD |
424 | event = chan->compat_sc_table[id]; |
425 | else | |
426 | event = chan->sc_table[id]; | |
f405cfce | 427 | if (unlikely(!event)) { |
49c50022 | 428 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
429 | return; |
430 | } | |
49c50022 | 431 | entry = &table[id]; |
f405cfce | 432 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
433 | |
434 | switch (entry->nrargs) { | |
435 | case 0: | |
436 | { | |
437 | void (*fptr)(void *__data) = entry->func; | |
438 | ||
439 | fptr(event); | |
440 | break; | |
441 | } | |
442 | case 1: | |
443 | { | |
444 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
b75b8603 | 445 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 446 | |
b75b8603 | 447 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
448 | fptr(event, args[0]); |
449 | break; | |
450 | } | |
451 | case 2: | |
452 | { | |
453 | void (*fptr)(void *__data, | |
454 | unsigned long arg0, | |
455 | unsigned long arg1) = entry->func; | |
b75b8603 | 456 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 457 | |
b75b8603 | 458 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
459 | fptr(event, args[0], args[1]); |
460 | break; | |
461 | } | |
462 | case 3: | |
463 | { | |
464 | void (*fptr)(void *__data, | |
465 | unsigned long arg0, | |
466 | unsigned long arg1, | |
467 | unsigned long arg2) = entry->func; | |
b75b8603 | 468 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 469 | |
b75b8603 | 470 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
471 | fptr(event, args[0], args[1], args[2]); |
472 | break; | |
473 | } | |
474 | case 4: | |
475 | { | |
476 | void (*fptr)(void *__data, | |
477 | unsigned long arg0, | |
478 | unsigned long arg1, | |
479 | unsigned long arg2, | |
480 | unsigned long arg3) = entry->func; | |
b75b8603 | 481 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 482 | |
b75b8603 | 483 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
484 | fptr(event, args[0], args[1], args[2], args[3]); |
485 | break; | |
486 | } | |
487 | case 5: | |
488 | { | |
489 | void (*fptr)(void *__data, | |
490 | unsigned long arg0, | |
491 | unsigned long arg1, | |
492 | unsigned long arg2, | |
493 | unsigned long arg3, | |
494 | unsigned long arg4) = entry->func; | |
b75b8603 | 495 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 496 | |
b75b8603 | 497 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
498 | fptr(event, args[0], args[1], args[2], args[3], args[4]); |
499 | break; | |
500 | } | |
501 | case 6: | |
502 | { | |
503 | void (*fptr)(void *__data, | |
504 | unsigned long arg0, | |
505 | unsigned long arg1, | |
506 | unsigned long arg2, | |
507 | unsigned long arg3, | |
508 | unsigned long arg4, | |
509 | unsigned long arg5) = entry->func; | |
b75b8603 | 510 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 511 | |
b75b8603 | 512 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
513 | fptr(event, args[0], args[1], args[2], |
514 | args[3], args[4], args[5]); | |
515 | break; | |
516 | } | |
517 | default: | |
518 | break; | |
519 | } | |
520 | } | |
521 | ||
5b7ac358 | 522 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 523 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 524 | { |
b75b8603 | 525 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 526 | |
b75b8603 | 527 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 528 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
529 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
530 | args); | |
531 | else | |
532 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
533 | } | |
534 | ||
535 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
536 | { | |
537 | struct lttng_channel *chan = __data; | |
538 | struct lttng_event *event, *unknown_event; | |
539 | const struct trace_syscall_entry *table, *entry; | |
540 | size_t table_len; | |
541 | long id; | |
542 | ||
543 | id = syscall_get_nr(current, regs); | |
1aa3298b | 544 | if (unlikely(in_compat_syscall())) { |
5b7ac358 MD |
545 | struct lttng_syscall_filter *filter; |
546 | ||
49e2f4c4 | 547 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 548 | if (filter) { |
74f7b56a | 549 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
550 | || !test_bit(id, filter->sc_compat)) { |
551 | /* System call filtered out. */ | |
552 | return; | |
553 | } | |
554 | } | |
555 | table = compat_sc_exit_table; | |
556 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
557 | unknown_event = chan->compat_sc_exit_unknown; | |
558 | } else { | |
559 | struct lttng_syscall_filter *filter; | |
560 | ||
49e2f4c4 | 561 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 562 | if (filter) { |
74f7b56a | 563 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
564 | || !test_bit(id, filter->sc)) { |
565 | /* System call filtered out. */ | |
566 | return; | |
567 | } | |
568 | } | |
569 | table = sc_exit_table; | |
570 | table_len = ARRAY_SIZE(sc_exit_table); | |
571 | unknown_event = chan->sc_exit_unknown; | |
572 | } | |
74f7b56a | 573 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
574 | syscall_exit_unknown(unknown_event, regs, id, ret); |
575 | return; | |
576 | } | |
1aa3298b | 577 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
578 | event = chan->compat_sc_exit_table[id]; |
579 | else | |
580 | event = chan->sc_exit_table[id]; | |
581 | if (unlikely(!event)) { | |
582 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
583 | return; | |
584 | } | |
585 | entry = &table[id]; | |
586 | WARN_ON_ONCE(!entry); | |
587 | ||
588 | switch (entry->nrargs) { | |
589 | case 0: | |
590 | { | |
fc4f7161 | 591 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 592 | |
fc4f7161 | 593 | fptr(event, ret); |
5b7ac358 MD |
594 | break; |
595 | } | |
596 | case 1: | |
597 | { | |
598 | void (*fptr)(void *__data, | |
fc4f7161 | 599 | long ret, |
5b7ac358 | 600 | unsigned long arg0) = entry->func; |
b75b8603 | 601 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 602 | |
b75b8603 | 603 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 604 | fptr(event, ret, args[0]); |
5b7ac358 MD |
605 | break; |
606 | } | |
607 | case 2: | |
608 | { | |
609 | void (*fptr)(void *__data, | |
fc4f7161 | 610 | long ret, |
5b7ac358 MD |
611 | unsigned long arg0, |
612 | unsigned long arg1) = entry->func; | |
b75b8603 | 613 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 614 | |
b75b8603 | 615 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 616 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
617 | break; |
618 | } | |
619 | case 3: | |
620 | { | |
621 | void (*fptr)(void *__data, | |
fc4f7161 | 622 | long ret, |
5b7ac358 MD |
623 | unsigned long arg0, |
624 | unsigned long arg1, | |
625 | unsigned long arg2) = entry->func; | |
b75b8603 | 626 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 627 | |
b75b8603 | 628 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 629 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
630 | break; |
631 | } | |
632 | case 4: | |
633 | { | |
634 | void (*fptr)(void *__data, | |
fc4f7161 | 635 | long ret, |
5b7ac358 MD |
636 | unsigned long arg0, |
637 | unsigned long arg1, | |
638 | unsigned long arg2, | |
639 | unsigned long arg3) = entry->func; | |
b75b8603 | 640 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 641 | |
b75b8603 | 642 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 643 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
644 | break; |
645 | } | |
646 | case 5: | |
647 | { | |
648 | void (*fptr)(void *__data, | |
fc4f7161 | 649 | long ret, |
5b7ac358 MD |
650 | unsigned long arg0, |
651 | unsigned long arg1, | |
652 | unsigned long arg2, | |
653 | unsigned long arg3, | |
654 | unsigned long arg4) = entry->func; | |
b75b8603 | 655 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 656 | |
b75b8603 | 657 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 658 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
659 | break; |
660 | } | |
661 | case 6: | |
662 | { | |
663 | void (*fptr)(void *__data, | |
fc4f7161 | 664 | long ret, |
5b7ac358 MD |
665 | unsigned long arg0, |
666 | unsigned long arg1, | |
667 | unsigned long arg2, | |
668 | unsigned long arg3, | |
669 | unsigned long arg4, | |
670 | unsigned long arg5) = entry->func; | |
b75b8603 | 671 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 672 | |
b75b8603 | 673 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 674 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
675 | args[3], args[4], args[5]); |
676 | break; | |
677 | } | |
678 | default: | |
679 | break; | |
680 | } | |
681 | } | |
682 | ||
33a39a3c MD |
683 | /* |
684 | * noinline to diminish caller stack size. | |
685 | * Should be called with sessions lock held. | |
686 | */ | |
49c50022 MD |
687 | static |
688 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
689 | struct lttng_event **chan_table, struct lttng_channel *chan, |
690 | void *filter, enum sc_type type) | |
259b6cb3 | 691 | { |
2a0c4816 | 692 | const struct lttng_event_desc *desc; |
259b6cb3 | 693 | unsigned int i; |
49c50022 MD |
694 | |
695 | /* Allocate events for each syscall, insert into table */ | |
696 | for (i = 0; i < table_len; i++) { | |
697 | struct lttng_kernel_event ev; | |
2a0c4816 | 698 | desc = table[i].desc; |
49c50022 MD |
699 | |
700 | if (!desc) { | |
701 | /* Unknown syscall */ | |
702 | continue; | |
703 | } | |
704 | /* | |
705 | * Skip those already populated by previous failed | |
706 | * register for this channel. | |
707 | */ | |
708 | if (chan_table[i]) | |
709 | continue; | |
710 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
711 | switch (type) { |
712 | case SC_TYPE_ENTRY: | |
713 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
714 | LTTNG_KERNEL_SYM_NAME_LEN); | |
715 | break; | |
716 | case SC_TYPE_EXIT: | |
717 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
718 | LTTNG_KERNEL_SYM_NAME_LEN); | |
719 | break; | |
720 | case SC_TYPE_COMPAT_ENTRY: | |
721 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
722 | LTTNG_KERNEL_SYM_NAME_LEN); | |
723 | break; | |
724 | case SC_TYPE_COMPAT_EXIT: | |
725 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
726 | LTTNG_KERNEL_SYM_NAME_LEN); | |
727 | break; | |
728 | default: | |
729 | BUG_ON(1); | |
730 | break; | |
731 | } | |
732 | strncat(ev.name, desc->name, | |
733 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 734 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
735 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
736 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 737 | desc, ev.instrumentation); |
abc0446a MD |
738 | WARN_ON_ONCE(!chan_table[i]); |
739 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
740 | /* |
741 | * If something goes wrong in event registration | |
742 | * after the first one, we have no choice but to | |
743 | * leave the previous events in there, until | |
744 | * deleted by session teardown. | |
745 | */ | |
abc0446a | 746 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
747 | } |
748 | } | |
749 | return 0; | |
750 | } | |
751 | ||
33a39a3c MD |
752 | /* |
753 | * Should be called with sessions lock held. | |
754 | */ | |
a90917c3 | 755 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 756 | { |
2a0c4816 | 757 | struct lttng_kernel_event ev; |
259b6cb3 MD |
758 | int ret; |
759 | ||
760 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
761 | |
762 | if (!chan->sc_table) { | |
763 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 764 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
765 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
766 | if (!chan->sc_table) | |
767 | return -ENOMEM; | |
768 | } | |
5b7ac358 MD |
769 | if (!chan->sc_exit_table) { |
770 | /* create syscall table mapping syscall to events */ | |
771 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
772 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
773 | if (!chan->sc_exit_table) | |
774 | return -ENOMEM; | |
775 | } | |
776 | ||
259b6cb3 | 777 | |
49c50022 MD |
778 | #ifdef CONFIG_COMPAT |
779 | if (!chan->compat_sc_table) { | |
780 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 781 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 782 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
783 | if (!chan->compat_sc_table) |
784 | return -ENOMEM; | |
785 | } | |
5b7ac358 MD |
786 | |
787 | if (!chan->compat_sc_exit_table) { | |
788 | /* create syscall table mapping compat syscall to events */ | |
789 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
790 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
791 | if (!chan->compat_sc_exit_table) | |
792 | return -ENOMEM; | |
793 | } | |
49c50022 | 794 | #endif |
f405cfce | 795 | if (!chan->sc_unknown) { |
f405cfce | 796 | const struct lttng_event_desc *desc = |
d4291869 | 797 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 798 | |
f405cfce | 799 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
800 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
801 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
802 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
803 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
804 | desc, |
805 | ev.instrumentation); | |
abc0446a MD |
806 | WARN_ON_ONCE(!chan->sc_unknown); |
807 | if (IS_ERR(chan->sc_unknown)) { | |
808 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
809 | } |
810 | } | |
811 | ||
b76dc1a0 | 812 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 813 | const struct lttng_event_desc *desc = |
d4291869 | 814 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
815 | |
816 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
817 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
818 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
819 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
820 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
821 | desc, |
822 | ev.instrumentation); | |
abc0446a MD |
823 | WARN_ON_ONCE(!chan->sc_unknown); |
824 | if (IS_ERR(chan->sc_compat_unknown)) { | |
825 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
826 | } |
827 | } | |
828 | ||
5b7ac358 | 829 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 830 | const struct lttng_event_desc *desc = |
5b7ac358 | 831 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
832 | |
833 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
834 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
835 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
836 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
837 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, | |
3c997079 MD |
838 | filter, desc, |
839 | ev.instrumentation); | |
5b7ac358 MD |
840 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
841 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
842 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
843 | } | |
844 | } | |
845 | ||
846 | if (!chan->sc_exit_unknown) { | |
847 | const struct lttng_event_desc *desc = | |
848 | &__event_desc___syscall_exit_unknown; | |
849 | ||
850 | memset(&ev, 0, sizeof(ev)); | |
851 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
852 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
853 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
854 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 855 | desc, ev.instrumentation); |
5b7ac358 MD |
856 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
857 | if (IS_ERR(chan->sc_exit_unknown)) { | |
858 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
859 | } |
860 | } | |
861 | ||
49c50022 | 862 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
863 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
864 | if (ret) | |
865 | return ret; | |
866 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
867 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
868 | if (ret) |
869 | return ret; | |
5b7ac358 | 870 | |
49c50022 | 871 | #ifdef CONFIG_COMPAT |
a93244f8 | 872 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
873 | chan->compat_sc_table, chan, filter, |
874 | SC_TYPE_COMPAT_ENTRY); | |
875 | if (ret) | |
876 | return ret; | |
877 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
878 | chan->compat_sc_exit_table, chan, filter, | |
879 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
880 | if (ret) |
881 | return ret; | |
882 | #endif | |
80f87dd2 MD |
883 | if (!chan->sys_enter_registered) { |
884 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
885 | (void *) syscall_entry_probe, chan); | |
886 | if (ret) | |
887 | return ret; | |
888 | chan->sys_enter_registered = 1; | |
889 | } | |
63728b02 MD |
890 | /* |
891 | * We change the name of sys_exit tracepoint due to namespace | |
892 | * conflict with sys_exit syscall entry. | |
893 | */ | |
80f87dd2 MD |
894 | if (!chan->sys_exit_registered) { |
895 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 896 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
897 | if (ret) { |
898 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
899 | (void *) syscall_entry_probe, chan)); | |
900 | return ret; | |
901 | } | |
902 | chan->sys_exit_registered = 1; | |
63728b02 | 903 | } |
259b6cb3 MD |
904 | return ret; |
905 | } | |
906 | ||
907 | /* | |
908 | * Only called at session destruction. | |
909 | */ | |
a90917c3 | 910 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
911 | { |
912 | int ret; | |
913 | ||
914 | if (!chan->sc_table) | |
915 | return 0; | |
80f87dd2 MD |
916 | if (chan->sys_enter_registered) { |
917 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 918 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
919 | if (ret) |
920 | return ret; | |
921 | chan->sys_enter_registered = 0; | |
922 | } | |
923 | if (chan->sys_exit_registered) { | |
924 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
925 | (void *) syscall_entry_probe, chan); | |
926 | if (ret) | |
927 | return ret; | |
928 | chan->sys_exit_registered = 0; | |
929 | } | |
a90917c3 | 930 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 931 | kfree(chan->sc_table); |
5b7ac358 | 932 | kfree(chan->sc_exit_table); |
49c50022 MD |
933 | #ifdef CONFIG_COMPAT |
934 | kfree(chan->compat_sc_table); | |
5b7ac358 | 935 | kfree(chan->compat_sc_exit_table); |
49c50022 | 936 | #endif |
80f87dd2 MD |
937 | kfree(chan->sc_filter); |
938 | return 0; | |
939 | } | |
940 | ||
941 | static | |
942 | int get_syscall_nr(const char *syscall_name) | |
943 | { | |
944 | int syscall_nr = -1; | |
945 | int i; | |
946 | ||
947 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
948 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 949 | const char *it_name; |
80f87dd2 MD |
950 | |
951 | entry = &sc_table[i]; | |
952 | if (!entry->desc) | |
953 | continue; | |
5b7ac358 MD |
954 | it_name = entry->desc->name; |
955 | it_name += strlen(SYSCALL_ENTRY_STR); | |
956 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
957 | syscall_nr = i; |
958 | break; | |
959 | } | |
960 | } | |
961 | return syscall_nr; | |
962 | } | |
963 | ||
964 | static | |
965 | int get_compat_syscall_nr(const char *syscall_name) | |
966 | { | |
967 | int syscall_nr = -1; | |
968 | int i; | |
969 | ||
970 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
971 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 972 | const char *it_name; |
80f87dd2 MD |
973 | |
974 | entry = &compat_sc_table[i]; | |
975 | if (!entry->desc) | |
976 | continue; | |
5b7ac358 MD |
977 | it_name = entry->desc->name; |
978 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
979 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
980 | syscall_nr = i; |
981 | break; | |
982 | } | |
983 | } | |
984 | return syscall_nr; | |
985 | } | |
986 | ||
12e579db MD |
987 | static |
988 | uint32_t get_sc_tables_len(void) | |
989 | { | |
990 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
991 | } | |
992 | ||
80f87dd2 MD |
993 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
994 | const char *name) | |
995 | { | |
996 | int syscall_nr, compat_syscall_nr, ret; | |
997 | struct lttng_syscall_filter *filter; | |
998 | ||
999 | WARN_ON_ONCE(!chan->sc_table); | |
1000 | ||
1001 | if (!name) { | |
1002 | /* Enable all system calls by removing filter */ | |
1003 | if (chan->sc_filter) { | |
1004 | filter = chan->sc_filter; | |
1005 | rcu_assign_pointer(chan->sc_filter, NULL); | |
1006 | synchronize_trace(); | |
1007 | kfree(filter); | |
1008 | } | |
1009 | chan->syscall_all = 1; | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | if (!chan->sc_filter) { | |
1014 | if (chan->syscall_all) { | |
1015 | /* | |
1016 | * All syscalls are already enabled. | |
1017 | */ | |
1018 | return -EEXIST; | |
1019 | } | |
1020 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1021 | GFP_KERNEL); | |
1022 | if (!filter) | |
1023 | return -ENOMEM; | |
1024 | } else { | |
1025 | filter = chan->sc_filter; | |
1026 | } | |
1027 | syscall_nr = get_syscall_nr(name); | |
1028 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1029 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1030 | ret = -ENOENT; | |
1031 | goto error; | |
1032 | } | |
1033 | if (syscall_nr >= 0) { | |
1034 | if (test_bit(syscall_nr, filter->sc)) { | |
1035 | ret = -EEXIST; | |
1036 | goto error; | |
1037 | } | |
1038 | bitmap_set(filter->sc, syscall_nr, 1); | |
1039 | } | |
1040 | if (compat_syscall_nr >= 0) { | |
1041 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1042 | ret = -EEXIST; | |
1043 | goto error; | |
1044 | } | |
1045 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1046 | } | |
1047 | if (!chan->sc_filter) | |
1048 | rcu_assign_pointer(chan->sc_filter, filter); | |
1049 | return 0; | |
1050 | ||
1051 | error: | |
1052 | if (!chan->sc_filter) | |
1053 | kfree(filter); | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1058 | const char *name) | |
1059 | { | |
1060 | int syscall_nr, compat_syscall_nr, ret; | |
1061 | struct lttng_syscall_filter *filter; | |
1062 | ||
1063 | WARN_ON_ONCE(!chan->sc_table); | |
1064 | ||
1065 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1066 | if (!chan->syscall_all) |
1067 | return -EEXIST; | |
80f87dd2 MD |
1068 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1069 | GFP_KERNEL); | |
1070 | if (!filter) | |
1071 | return -ENOMEM; | |
1072 | /* Trace all system calls, then apply disable. */ | |
1073 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1074 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1075 | } else { | |
1076 | filter = chan->sc_filter; | |
1077 | } | |
1078 | ||
72814741 | 1079 | if (!name) { |
404e87bf MD |
1080 | /* Fail if all syscalls are already disabled. */ |
1081 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1082 | && bitmap_empty(filter->sc_compat, | |
1083 | NR_compat_syscalls)) { | |
1084 | ret = -EEXIST; | |
1085 | goto error; | |
1086 | } | |
1087 | ||
72814741 MD |
1088 | /* Disable all system calls */ |
1089 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1090 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1091 | goto apply_filter; | |
1092 | } | |
80f87dd2 MD |
1093 | syscall_nr = get_syscall_nr(name); |
1094 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1095 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1096 | ret = -ENOENT; | |
1097 | goto error; | |
1098 | } | |
1099 | if (syscall_nr >= 0) { | |
cecef7f8 | 1100 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1101 | ret = -EEXIST; |
1102 | goto error; | |
1103 | } | |
cecef7f8 | 1104 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1105 | } |
1106 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1107 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1108 | ret = -EEXIST; |
1109 | goto error; | |
1110 | } | |
cecef7f8 | 1111 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1112 | } |
72814741 | 1113 | apply_filter: |
80f87dd2 MD |
1114 | if (!chan->sc_filter) |
1115 | rcu_assign_pointer(chan->sc_filter, filter); | |
1116 | chan->syscall_all = 0; | |
259b6cb3 | 1117 | return 0; |
80f87dd2 MD |
1118 | |
1119 | error: | |
1120 | if (!chan->sc_filter) | |
1121 | kfree(filter); | |
1122 | return ret; | |
259b6cb3 | 1123 | } |
2d2464bd MD |
1124 | |
1125 | static | |
1126 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1127 | { | |
1128 | const struct trace_syscall_entry *entry; | |
1129 | int iter = 0; | |
1130 | ||
1131 | for (entry = sc_table; | |
1132 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1133 | entry++) { | |
1134 | if (iter++ >= *pos) | |
1135 | return entry; | |
1136 | } | |
1137 | for (entry = compat_sc_table; | |
1138 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1139 | entry++) { | |
1140 | if (iter++ >= *pos) | |
1141 | return entry; | |
1142 | } | |
1143 | /* End of list */ | |
1144 | return NULL; | |
1145 | } | |
1146 | ||
1147 | static | |
1148 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1149 | { | |
1150 | return (void *) syscall_list_get_entry(pos); | |
1151 | } | |
1152 | ||
1153 | static | |
1154 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1155 | { | |
1156 | (*ppos)++; | |
1157 | return (void *) syscall_list_get_entry(ppos); | |
1158 | } | |
1159 | ||
1160 | static | |
1161 | void syscall_list_stop(struct seq_file *m, void *p) | |
1162 | { | |
1163 | } | |
1164 | ||
12e579db MD |
1165 | static |
1166 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1167 | const struct trace_syscall_entry **table, | |
1168 | unsigned int *bitness) | |
1169 | { | |
1170 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1171 | if (bitness) | |
1172 | *bitness = BITS_PER_LONG; | |
1173 | if (table) | |
1174 | *table = sc_table; | |
1175 | return 0; | |
1176 | } | |
1177 | if (!(entry >= compat_sc_table | |
1178 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1179 | return -EINVAL; | |
1180 | } | |
1181 | if (bitness) | |
1182 | *bitness = 32; | |
1183 | if (table) | |
1184 | *table = compat_sc_table; | |
1185 | return 0; | |
1186 | } | |
1187 | ||
2d2464bd MD |
1188 | static |
1189 | int syscall_list_show(struct seq_file *m, void *p) | |
1190 | { | |
1191 | const struct trace_syscall_entry *table, *entry = p; | |
1192 | unsigned int bitness; | |
d4291869 | 1193 | unsigned long index; |
12e579db | 1194 | int ret; |
d4291869 | 1195 | const char *name; |
2d2464bd | 1196 | |
12e579db MD |
1197 | ret = get_sc_table(entry, &table, &bitness); |
1198 | if (ret) | |
1199 | return ret; | |
f4855b46 MD |
1200 | if (!entry->desc) |
1201 | return 0; | |
d4291869 MD |
1202 | if (table == sc_table) { |
1203 | index = entry - table; | |
1204 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1205 | } else { | |
1206 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1207 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1208 | } | |
12e579db | 1209 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1210 | index, name, bitness); |
2d2464bd MD |
1211 | return 0; |
1212 | } | |
1213 | ||
1214 | static | |
1215 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1216 | .start = syscall_list_start, | |
1217 | .next = syscall_list_next, | |
1218 | .stop = syscall_list_stop, | |
1219 | .show = syscall_list_show, | |
1220 | }; | |
1221 | ||
1222 | static | |
1223 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1224 | { | |
1225 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1226 | } | |
1227 | ||
1228 | const struct file_operations lttng_syscall_list_fops = { | |
1229 | .owner = THIS_MODULE, | |
1230 | .open = lttng_syscall_list_open, | |
1231 | .read = seq_read, | |
1232 | .llseek = seq_lseek, | |
1233 | .release = seq_release, | |
1234 | }; | |
12e579db MD |
1235 | |
1236 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1237 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1238 | { | |
1239 | uint32_t len, sc_tables_len, bitmask_len; | |
1240 | int ret = 0, bit; | |
1241 | char *tmp_mask; | |
1242 | struct lttng_syscall_filter *filter; | |
1243 | ||
1244 | ret = get_user(len, &usyscall_mask->len); | |
1245 | if (ret) | |
1246 | return ret; | |
1247 | sc_tables_len = get_sc_tables_len(); | |
1248 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1249 | if (len < sc_tables_len) { | |
1250 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1251 | } | |
1252 | /* Array is large enough, we can copy array to user-space. */ | |
1253 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1254 | if (!tmp_mask) | |
1255 | return -ENOMEM; | |
1256 | filter = channel->sc_filter; | |
1257 | ||
1258 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
0d2154e8 | 1259 | char state; |
2f25059d MD |
1260 | |
1261 | if (channel->sc_table) { | |
1262 | if (filter) | |
1263 | state = test_bit(bit, filter->sc); | |
1264 | else | |
1265 | state = 1; | |
1266 | } else { | |
1267 | state = 0; | |
1268 | } | |
1269 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1270 | } |
1271 | for (; bit < sc_tables_len; bit++) { | |
0d2154e8 | 1272 | char state; |
2f25059d MD |
1273 | |
1274 | if (channel->compat_sc_table) { | |
1275 | if (filter) | |
1276 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1277 | filter->sc_compat); | |
1278 | else | |
1279 | state = 1; | |
1280 | } else { | |
1281 | state = 0; | |
1282 | } | |
1283 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1284 | } |
1285 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1286 | ret = -EFAULT; | |
1287 | kfree(tmp_mask); | |
1288 | return ret; | |
1289 | } | |
082d4946 MD |
1290 | |
1291 | int lttng_abi_syscall_list(void) | |
1292 | { | |
1293 | struct file *syscall_list_file; | |
1294 | int file_fd, ret; | |
1295 | ||
4ac10b76 | 1296 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1297 | if (file_fd < 0) { |
1298 | ret = file_fd; | |
1299 | goto fd_error; | |
1300 | } | |
1301 | ||
1302 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1303 | <tng_syscall_list_fops, | |
1304 | NULL, O_RDWR); | |
1305 | if (IS_ERR(syscall_list_file)) { | |
1306 | ret = PTR_ERR(syscall_list_file); | |
1307 | goto file_error; | |
1308 | } | |
1309 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1310 | if (ret < 0) | |
1311 | goto open_error; | |
1312 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1313 | return file_fd; |
1314 | ||
1315 | open_error: | |
1316 | fput(syscall_list_file); | |
1317 | file_error: | |
1318 | put_unused_fd(file_fd); | |
1319 | fd_error: | |
1320 | return ret; | |
1321 | } |