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> |
7c92789f 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 | ||
12e579db | 37 | #include "lib/bitfield.h" |
3a523f5b | 38 | #include "wrapper/tracepoint.h" |
14a4b602 | 39 | #include "wrapper/file.h" |
a90917c3 | 40 | #include "lttng-events.h" |
259b6cb3 | 41 | |
6333ace3 | 42 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
43 | # ifndef is_compat_task |
44 | # define is_compat_task() (0) | |
45 | # endif | |
6333ace3 MD |
46 | #endif |
47 | ||
5b7ac358 MD |
48 | enum sc_type { |
49 | SC_TYPE_ENTRY, | |
50 | SC_TYPE_EXIT, | |
51 | SC_TYPE_COMPAT_ENTRY, | |
52 | SC_TYPE_COMPAT_EXIT, | |
53 | }; | |
54 | ||
d4291869 MD |
55 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
56 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
57 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
58 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
59 | ||
60 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
61 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
62 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
63 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 64 | |
a93244f8 | 65 | static |
2faf7d1b | 66 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
67 | static |
68 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 69 | |
3a523f5b MD |
70 | /* |
71 | * Forward declarations for old kernels. | |
72 | */ | |
73 | struct mmsghdr; | |
74 | struct rlimit64; | |
75 | struct oldold_utsname; | |
76 | struct old_utsname; | |
77 | struct sel_arg_struct; | |
78 | struct mmap_arg_struct; | |
c62ab2ad | 79 | struct file_handle; |
3a523f5b | 80 | |
80f87dd2 MD |
81 | #ifdef IA32_NR_syscalls |
82 | #define NR_compat_syscalls IA32_NR_syscalls | |
83 | #else | |
84 | #define NR_compat_syscalls NR_syscalls | |
85 | #endif | |
86 | ||
259b6cb3 MD |
87 | /* |
88 | * Create LTTng tracepoint probes. | |
89 | */ | |
90 | #define LTTNG_PACKAGE_BUILD | |
91 | #define CREATE_TRACE_POINTS | |
2655f9ad | 92 | #define TP_MODULE_NOINIT |
2f804c0a | 93 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 94 | |
a93244f8 MD |
95 | #define PARAMS(args...) args |
96 | ||
5b7ac358 | 97 | /* Handle unknown syscalls */ |
72a52753 | 98 | #undef TRACE_SYSTEM |
5b7ac358 MD |
99 | #define TRACE_SYSTEM syscalls_unknown |
100 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
101 | #undef TRACE_SYSTEM | |
102 | ||
fc4f7161 MD |
103 | #define SC_ENTER |
104 | ||
fc4f7161 MD |
105 | #undef sc_exit |
106 | #define sc_exit(...) | |
b75d00c4 MD |
107 | #undef sc_in |
108 | #define sc_in(...) __VA_ARGS__ | |
109 | #undef sc_out | |
110 | #define sc_out(...) | |
111 | #undef sc_inout | |
112 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
113 | |
114 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 115 | #undef TP_PROBE_CB |
259b6cb3 | 116 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 117 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
d4291869 | 118 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 | 119 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 120 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
d4291869 | 121 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 122 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 123 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 124 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
d4291869 | 125 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 126 | PARAMS(_printk)) |
cb3ef14c | 127 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 128 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
a93244f8 | 129 | #undef TRACE_SYSTEM |
d4291869 | 130 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 131 | #define TRACE_INCLUDE_FILE syscalls_integers |
177b3692 | 132 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 133 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 134 | #undef TRACE_SYSTEM |
d4291869 | 135 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 136 | #define TRACE_INCLUDE_FILE syscalls_pointers |
177b3692 | 137 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 138 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 139 | #undef TRACE_SYSTEM |
cb3ef14c MD |
140 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
141 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
142 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
143 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 144 | #undef TP_PROBE_CB |
3bc29f0a MD |
145 | #undef _TRACE_SYSCALLS_INTEGERS_H |
146 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
147 | |
148 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 149 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 150 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
d4291869 | 151 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 152 | PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 153 | PARAMS(_printk)) |
cb3ef14c | 154 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
d4291869 | 155 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 156 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 157 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 158 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
d4291869 | 159 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_struct), \ |
5b7ac358 | 160 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 161 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
162 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
163 | compat_syscall_entry_##_name) | |
164 | #define TRACE_SYSTEM compat_syscall_entry_integers | |
5b7ac358 MD |
165 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
166 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
167 | #undef TRACE_INCLUDE_FILE | |
168 | #undef TRACE_SYSTEM | |
d4291869 | 169 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 MD |
170 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
171 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
172 | #undef TRACE_INCLUDE_FILE | |
173 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
174 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
175 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
176 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
177 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 178 | #undef TP_PROBE_CB |
3bc29f0a MD |
179 | #undef _TRACE_SYSCALLS_INTEGERS_H |
180 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 181 | |
fc4f7161 MD |
182 | #undef SC_ENTER |
183 | ||
184 | #define SC_EXIT | |
185 | ||
fc4f7161 MD |
186 | #undef sc_exit |
187 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
188 | #undef sc_in |
189 | #define sc_in(...) | |
190 | #undef sc_out | |
191 | #define sc_out(...) __VA_ARGS__ | |
192 | #undef sc_inout | |
193 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
194 | |
195 | /* Hijack probe callback for system call exit */ | |
196 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 197 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 198 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 199 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 200 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 201 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 202 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 203 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 204 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 205 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \ |
5b7ac358 | 206 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c MD |
207 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
208 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 MD |
209 | syscall_exit_##_name) |
210 | #define TRACE_SYSTEM syscall_exit_integers | |
211 | #define TRACE_INCLUDE_FILE syscalls_integers | |
212 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
213 | #undef TRACE_INCLUDE_FILE | |
214 | #undef TRACE_SYSTEM | |
215 | #define TRACE_SYSTEM syscall_exit_pointers | |
216 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
217 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
218 | #undef TRACE_INCLUDE_FILE | |
219 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
220 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
221 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
222 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
223 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 224 | #undef TP_PROBE_CB |
3bc29f0a MD |
225 | #undef _TRACE_SYSCALLS_INTEGERS_H |
226 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
227 | |
228 | ||
229 | /* Hijack probe callback for compat system call exit */ | |
230 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 231 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 232 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 233 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 234 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 235 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 236 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 237 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 238 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 239 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \ |
a93244f8 | 240 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 241 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 242 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 MD |
243 | compat_syscall_exit_##_name) |
244 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
245 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 246 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 247 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 248 | #undef TRACE_SYSTEM |
5b7ac358 MD |
249 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
250 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 251 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 252 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 253 | #undef TRACE_SYSTEM |
cb3ef14c MD |
254 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
255 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
256 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
257 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 258 | #undef TP_PROBE_CB |
3bc29f0a MD |
259 | #undef _TRACE_SYSCALLS_INTEGERS_H |
260 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 261 | |
fc4f7161 | 262 | #undef SC_EXIT |
259b6cb3 | 263 | |
2655f9ad | 264 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
265 | #undef LTTNG_PACKAGE_BUILD |
266 | #undef CREATE_TRACE_POINTS | |
267 | ||
a93244f8 MD |
268 | struct trace_syscall_entry { |
269 | void *func; | |
270 | const struct lttng_event_desc *desc; | |
271 | const struct lttng_event_field *fields; | |
272 | unsigned int nrargs; | |
273 | }; | |
274 | ||
275 | #define CREATE_SYSCALL_TABLE | |
276 | ||
fc4f7161 MD |
277 | #define SC_ENTER |
278 | ||
279 | #undef sc_exit | |
280 | #define sc_exit(...) | |
281 | ||
259b6cb3 | 282 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 283 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 284 | [ _nr ] = { \ |
d4291869 | 285 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 286 | .nrargs = (_nrargs), \ |
d4291869 MD |
287 | .fields = __event_fields___syscall_entry_##_template, \ |
288 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
289 | }, |
290 | ||
5b7ac358 | 291 | /* Syscall enter tracing table */ |
49c50022 | 292 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
293 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
294 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
295 | }; |
296 | ||
a93244f8 MD |
297 | #undef TRACE_SYSCALL_TABLE |
298 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
299 | [ _nr ] = { \ | |
d4291869 | 300 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 301 | .nrargs = (_nrargs), \ |
d4291869 MD |
302 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
303 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
304 | }, |
305 | ||
5b7ac358 | 306 | /* Compat syscall enter table */ |
a93244f8 MD |
307 | const struct trace_syscall_entry compat_sc_table[] = { |
308 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
309 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
310 | }; | |
259b6cb3 | 311 | |
fc4f7161 MD |
312 | #undef SC_ENTER |
313 | ||
314 | #define SC_EXIT | |
315 | ||
316 | #undef sc_exit | |
317 | #define sc_exit(...) __VA_ARGS__ | |
318 | ||
5b7ac358 MD |
319 | #undef TRACE_SYSCALL_TABLE |
320 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
321 | [ _nr ] = { \ | |
322 | .func = __event_probe__syscall_exit_##_template, \ | |
323 | .nrargs = (_nrargs), \ | |
324 | .fields = __event_fields___syscall_exit_##_template, \ | |
325 | .desc = &__event_desc___syscall_exit_##_name, \ | |
326 | }, | |
327 | ||
328 | /* Syscall exit table */ | |
329 | static const struct trace_syscall_entry sc_exit_table[] = { | |
330 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
331 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
332 | }; | |
333 | ||
334 | #undef TRACE_SYSCALL_TABLE | |
335 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
336 | [ _nr ] = { \ | |
337 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
338 | .nrargs = (_nrargs), \ | |
339 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
340 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
341 | }, | |
342 | ||
343 | /* Compat syscall exit table */ | |
344 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
345 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
346 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
347 | }; | |
348 | ||
fc4f7161 MD |
349 | #undef SC_EXIT |
350 | ||
a93244f8 | 351 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 352 | |
80f87dd2 MD |
353 | struct lttng_syscall_filter { |
354 | DECLARE_BITMAP(sc, NR_syscalls); | |
355 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
356 | }; | |
357 | ||
a90917c3 | 358 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
359 | struct pt_regs *regs, unsigned int id) |
360 | { | |
361 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 362 | |
f405cfce | 363 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 364 | if (unlikely(is_compat_task())) |
d4291869 | 365 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 366 | else |
d4291869 | 367 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
368 | } |
369 | ||
2faf7d1b | 370 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 371 | { |
a90917c3 MD |
372 | struct lttng_channel *chan = __data; |
373 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
374 | const struct trace_syscall_entry *table, *entry; |
375 | size_t table_len; | |
259b6cb3 | 376 | |
b76dc1a0 | 377 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
378 | struct lttng_syscall_filter *filter; |
379 | ||
380 | filter = rcu_dereference(chan->sc_filter); | |
381 | if (filter) { | |
74f7b56a | 382 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
383 | || !test_bit(id, filter->sc_compat)) { |
384 | /* System call filtered out. */ | |
385 | return; | |
386 | } | |
387 | } | |
49c50022 | 388 | table = compat_sc_table; |
a93244f8 | 389 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
390 | unknown_event = chan->sc_compat_unknown; |
391 | } else { | |
80f87dd2 MD |
392 | struct lttng_syscall_filter *filter; |
393 | ||
394 | filter = rcu_dereference(chan->sc_filter); | |
395 | if (filter) { | |
74f7b56a | 396 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
397 | || !test_bit(id, filter->sc)) { |
398 | /* System call filtered out. */ | |
399 | return; | |
400 | } | |
401 | } | |
49c50022 MD |
402 | table = sc_table; |
403 | table_len = ARRAY_SIZE(sc_table); | |
404 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 405 | } |
74f7b56a | 406 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 407 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 408 | return; |
f405cfce | 409 | } |
49c50022 MD |
410 | if (unlikely(is_compat_task())) |
411 | event = chan->compat_sc_table[id]; | |
412 | else | |
413 | event = chan->sc_table[id]; | |
f405cfce | 414 | if (unlikely(!event)) { |
49c50022 | 415 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
416 | return; |
417 | } | |
49c50022 | 418 | entry = &table[id]; |
f405cfce | 419 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
420 | |
421 | switch (entry->nrargs) { | |
422 | case 0: | |
423 | { | |
424 | void (*fptr)(void *__data) = entry->func; | |
425 | ||
426 | fptr(event); | |
427 | break; | |
428 | } | |
429 | case 1: | |
430 | { | |
431 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
432 | unsigned long args[1]; | |
433 | ||
434 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
435 | fptr(event, args[0]); | |
436 | break; | |
437 | } | |
438 | case 2: | |
439 | { | |
440 | void (*fptr)(void *__data, | |
441 | unsigned long arg0, | |
442 | unsigned long arg1) = entry->func; | |
443 | unsigned long args[2]; | |
444 | ||
445 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
446 | fptr(event, args[0], args[1]); | |
447 | break; | |
448 | } | |
449 | case 3: | |
450 | { | |
451 | void (*fptr)(void *__data, | |
452 | unsigned long arg0, | |
453 | unsigned long arg1, | |
454 | unsigned long arg2) = entry->func; | |
455 | unsigned long args[3]; | |
456 | ||
457 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
458 | fptr(event, args[0], args[1], args[2]); | |
459 | break; | |
460 | } | |
461 | case 4: | |
462 | { | |
463 | void (*fptr)(void *__data, | |
464 | unsigned long arg0, | |
465 | unsigned long arg1, | |
466 | unsigned long arg2, | |
467 | unsigned long arg3) = entry->func; | |
468 | unsigned long args[4]; | |
469 | ||
470 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
471 | fptr(event, args[0], args[1], args[2], args[3]); | |
472 | break; | |
473 | } | |
474 | case 5: | |
475 | { | |
476 | void (*fptr)(void *__data, | |
477 | unsigned long arg0, | |
478 | unsigned long arg1, | |
479 | unsigned long arg2, | |
480 | unsigned long arg3, | |
481 | unsigned long arg4) = entry->func; | |
482 | unsigned long args[5]; | |
483 | ||
484 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
485 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
486 | break; | |
487 | } | |
488 | case 6: | |
489 | { | |
490 | void (*fptr)(void *__data, | |
491 | unsigned long arg0, | |
492 | unsigned long arg1, | |
493 | unsigned long arg2, | |
494 | unsigned long arg3, | |
495 | unsigned long arg4, | |
496 | unsigned long arg5) = entry->func; | |
497 | unsigned long args[6]; | |
498 | ||
499 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
500 | fptr(event, args[0], args[1], args[2], | |
501 | args[3], args[4], args[5]); | |
502 | break; | |
503 | } | |
504 | default: | |
505 | break; | |
506 | } | |
507 | } | |
508 | ||
5b7ac358 | 509 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 510 | struct pt_regs *regs, int id, long ret) |
5b7ac358 MD |
511 | { |
512 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
513 | ||
514 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
515 | if (unlikely(is_compat_task())) | |
516 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
517 | args); | |
518 | else | |
519 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
520 | } | |
521 | ||
522 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
523 | { | |
524 | struct lttng_channel *chan = __data; | |
525 | struct lttng_event *event, *unknown_event; | |
526 | const struct trace_syscall_entry *table, *entry; | |
527 | size_t table_len; | |
528 | long id; | |
529 | ||
530 | id = syscall_get_nr(current, regs); | |
531 | if (unlikely(is_compat_task())) { | |
532 | struct lttng_syscall_filter *filter; | |
533 | ||
534 | filter = rcu_dereference(chan->sc_filter); | |
535 | if (filter) { | |
74f7b56a | 536 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
537 | || !test_bit(id, filter->sc_compat)) { |
538 | /* System call filtered out. */ | |
539 | return; | |
540 | } | |
541 | } | |
542 | table = compat_sc_exit_table; | |
543 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
544 | unknown_event = chan->compat_sc_exit_unknown; | |
545 | } else { | |
546 | struct lttng_syscall_filter *filter; | |
547 | ||
548 | filter = rcu_dereference(chan->sc_filter); | |
549 | if (filter) { | |
74f7b56a | 550 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
551 | || !test_bit(id, filter->sc)) { |
552 | /* System call filtered out. */ | |
553 | return; | |
554 | } | |
555 | } | |
556 | table = sc_exit_table; | |
557 | table_len = ARRAY_SIZE(sc_exit_table); | |
558 | unknown_event = chan->sc_exit_unknown; | |
559 | } | |
74f7b56a | 560 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
561 | syscall_exit_unknown(unknown_event, regs, id, ret); |
562 | return; | |
563 | } | |
564 | if (unlikely(is_compat_task())) | |
565 | event = chan->compat_sc_exit_table[id]; | |
566 | else | |
567 | event = chan->sc_exit_table[id]; | |
568 | if (unlikely(!event)) { | |
569 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
570 | return; | |
571 | } | |
572 | entry = &table[id]; | |
573 | WARN_ON_ONCE(!entry); | |
574 | ||
575 | switch (entry->nrargs) { | |
576 | case 0: | |
577 | { | |
fc4f7161 | 578 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 579 | |
fc4f7161 | 580 | fptr(event, ret); |
5b7ac358 MD |
581 | break; |
582 | } | |
583 | case 1: | |
584 | { | |
585 | void (*fptr)(void *__data, | |
fc4f7161 | 586 | long ret, |
5b7ac358 MD |
587 | unsigned long arg0) = entry->func; |
588 | unsigned long args[1]; | |
589 | ||
590 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 591 | fptr(event, ret, args[0]); |
5b7ac358 MD |
592 | break; |
593 | } | |
594 | case 2: | |
595 | { | |
596 | void (*fptr)(void *__data, | |
fc4f7161 | 597 | long ret, |
5b7ac358 MD |
598 | unsigned long arg0, |
599 | unsigned long arg1) = entry->func; | |
600 | unsigned long args[2]; | |
601 | ||
602 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 603 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
604 | break; |
605 | } | |
606 | case 3: | |
607 | { | |
608 | void (*fptr)(void *__data, | |
fc4f7161 | 609 | long ret, |
5b7ac358 MD |
610 | unsigned long arg0, |
611 | unsigned long arg1, | |
612 | unsigned long arg2) = entry->func; | |
613 | unsigned long args[3]; | |
614 | ||
615 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 616 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
617 | break; |
618 | } | |
619 | case 4: | |
620 | { | |
621 | void (*fptr)(void *__data, | |
fc4f7161 | 622 | long ret, |
5b7ac358 MD |
623 | unsigned long arg0, |
624 | unsigned long arg1, | |
625 | unsigned long arg2, | |
626 | unsigned long arg3) = entry->func; | |
627 | unsigned long args[4]; | |
628 | ||
629 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 630 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
631 | break; |
632 | } | |
633 | case 5: | |
634 | { | |
635 | void (*fptr)(void *__data, | |
fc4f7161 | 636 | long ret, |
5b7ac358 MD |
637 | unsigned long arg0, |
638 | unsigned long arg1, | |
639 | unsigned long arg2, | |
640 | unsigned long arg3, | |
641 | unsigned long arg4) = entry->func; | |
642 | unsigned long args[5]; | |
643 | ||
644 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 645 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
646 | break; |
647 | } | |
648 | case 6: | |
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, | |
656 | unsigned long arg4, | |
657 | unsigned long arg5) = entry->func; | |
658 | unsigned long args[6]; | |
659 | ||
660 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 661 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
662 | args[3], args[4], args[5]); |
663 | break; | |
664 | } | |
665 | default: | |
666 | break; | |
667 | } | |
668 | } | |
669 | ||
2a0c4816 | 670 | /* noinline to diminish caller stack size */ |
49c50022 MD |
671 | static |
672 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
673 | struct lttng_event **chan_table, struct lttng_channel *chan, |
674 | void *filter, enum sc_type type) | |
259b6cb3 | 675 | { |
2a0c4816 | 676 | const struct lttng_event_desc *desc; |
259b6cb3 | 677 | unsigned int i; |
49c50022 MD |
678 | |
679 | /* Allocate events for each syscall, insert into table */ | |
680 | for (i = 0; i < table_len; i++) { | |
681 | struct lttng_kernel_event ev; | |
2a0c4816 | 682 | desc = table[i].desc; |
49c50022 MD |
683 | |
684 | if (!desc) { | |
685 | /* Unknown syscall */ | |
686 | continue; | |
687 | } | |
688 | /* | |
689 | * Skip those already populated by previous failed | |
690 | * register for this channel. | |
691 | */ | |
692 | if (chan_table[i]) | |
693 | continue; | |
694 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
695 | switch (type) { |
696 | case SC_TYPE_ENTRY: | |
697 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
698 | LTTNG_KERNEL_SYM_NAME_LEN); | |
699 | break; | |
700 | case SC_TYPE_EXIT: | |
701 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
702 | LTTNG_KERNEL_SYM_NAME_LEN); | |
703 | break; | |
704 | case SC_TYPE_COMPAT_ENTRY: | |
705 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
706 | LTTNG_KERNEL_SYM_NAME_LEN); | |
707 | break; | |
708 | case SC_TYPE_COMPAT_EXIT: | |
709 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
710 | LTTNG_KERNEL_SYM_NAME_LEN); | |
711 | break; | |
712 | default: | |
713 | BUG_ON(1); | |
714 | break; | |
715 | } | |
716 | strncat(ev.name, desc->name, | |
717 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 718 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
49c50022 | 719 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 720 | chan_table[i] = lttng_event_create(chan, &ev, filter, |
49c50022 | 721 | desc); |
abc0446a MD |
722 | WARN_ON_ONCE(!chan_table[i]); |
723 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
724 | /* |
725 | * If something goes wrong in event registration | |
726 | * after the first one, we have no choice but to | |
727 | * leave the previous events in there, until | |
728 | * deleted by session teardown. | |
729 | */ | |
abc0446a | 730 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
731 | } |
732 | } | |
733 | return 0; | |
734 | } | |
735 | ||
a90917c3 | 736 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 737 | { |
2a0c4816 | 738 | struct lttng_kernel_event ev; |
259b6cb3 MD |
739 | int ret; |
740 | ||
741 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
742 | |
743 | if (!chan->sc_table) { | |
744 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 745 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
746 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
747 | if (!chan->sc_table) | |
748 | return -ENOMEM; | |
749 | } | |
5b7ac358 MD |
750 | if (!chan->sc_exit_table) { |
751 | /* create syscall table mapping syscall to events */ | |
752 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
753 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
754 | if (!chan->sc_exit_table) | |
755 | return -ENOMEM; | |
756 | } | |
757 | ||
259b6cb3 | 758 | |
49c50022 MD |
759 | #ifdef CONFIG_COMPAT |
760 | if (!chan->compat_sc_table) { | |
761 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 762 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 763 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
764 | if (!chan->compat_sc_table) |
765 | return -ENOMEM; | |
766 | } | |
5b7ac358 MD |
767 | |
768 | if (!chan->compat_sc_exit_table) { | |
769 | /* create syscall table mapping compat syscall to events */ | |
770 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
771 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
772 | if (!chan->compat_sc_exit_table) | |
773 | return -ENOMEM; | |
774 | } | |
49c50022 | 775 | #endif |
f405cfce | 776 | if (!chan->sc_unknown) { |
f405cfce | 777 | const struct lttng_event_desc *desc = |
d4291869 | 778 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 779 | |
f405cfce | 780 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
781 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
782 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f405cfce | 783 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 784 | chan->sc_unknown = lttng_event_create(chan, &ev, filter, |
f405cfce | 785 | desc); |
abc0446a MD |
786 | WARN_ON_ONCE(!chan->sc_unknown); |
787 | if (IS_ERR(chan->sc_unknown)) { | |
788 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
789 | } |
790 | } | |
791 | ||
b76dc1a0 | 792 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 793 | const struct lttng_event_desc *desc = |
d4291869 | 794 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
795 | |
796 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
797 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
798 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
b76dc1a0 | 799 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 800 | chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter, |
b76dc1a0 | 801 | desc); |
abc0446a MD |
802 | WARN_ON_ONCE(!chan->sc_unknown); |
803 | if (IS_ERR(chan->sc_compat_unknown)) { | |
804 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
805 | } |
806 | } | |
807 | ||
5b7ac358 | 808 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 809 | const struct lttng_event_desc *desc = |
5b7ac358 | 810 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
811 | |
812 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
813 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
814 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2f804c0a | 815 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
5b7ac358 MD |
816 | chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev, |
817 | filter, desc); | |
818 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); | |
819 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
820 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
821 | } | |
822 | } | |
823 | ||
824 | if (!chan->sc_exit_unknown) { | |
825 | const struct lttng_event_desc *desc = | |
826 | &__event_desc___syscall_exit_unknown; | |
827 | ||
828 | memset(&ev, 0, sizeof(ev)); | |
829 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
830 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
831 | ev.instrumentation = LTTNG_KERNEL_NOOP; | |
832 | chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter, | |
2f804c0a | 833 | desc); |
5b7ac358 MD |
834 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
835 | if (IS_ERR(chan->sc_exit_unknown)) { | |
836 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
837 | } |
838 | } | |
839 | ||
49c50022 | 840 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
841 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
842 | if (ret) | |
843 | return ret; | |
844 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
845 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
846 | if (ret) |
847 | return ret; | |
5b7ac358 | 848 | |
49c50022 | 849 | #ifdef CONFIG_COMPAT |
a93244f8 | 850 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
851 | chan->compat_sc_table, chan, filter, |
852 | SC_TYPE_COMPAT_ENTRY); | |
853 | if (ret) | |
854 | return ret; | |
855 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
856 | chan->compat_sc_exit_table, chan, filter, | |
857 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
858 | if (ret) |
859 | return ret; | |
860 | #endif | |
80f87dd2 MD |
861 | if (!chan->sys_enter_registered) { |
862 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
863 | (void *) syscall_entry_probe, chan); | |
864 | if (ret) | |
865 | return ret; | |
866 | chan->sys_enter_registered = 1; | |
867 | } | |
63728b02 MD |
868 | /* |
869 | * We change the name of sys_exit tracepoint due to namespace | |
870 | * conflict with sys_exit syscall entry. | |
871 | */ | |
80f87dd2 MD |
872 | if (!chan->sys_exit_registered) { |
873 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 874 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
875 | if (ret) { |
876 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
877 | (void *) syscall_entry_probe, chan)); | |
878 | return ret; | |
879 | } | |
880 | chan->sys_exit_registered = 1; | |
63728b02 | 881 | } |
259b6cb3 MD |
882 | return ret; |
883 | } | |
884 | ||
885 | /* | |
886 | * Only called at session destruction. | |
887 | */ | |
a90917c3 | 888 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
889 | { |
890 | int ret; | |
891 | ||
892 | if (!chan->sc_table) | |
893 | return 0; | |
80f87dd2 MD |
894 | if (chan->sys_enter_registered) { |
895 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 896 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
897 | if (ret) |
898 | return ret; | |
899 | chan->sys_enter_registered = 0; | |
900 | } | |
901 | if (chan->sys_exit_registered) { | |
902 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
903 | (void *) syscall_entry_probe, chan); | |
904 | if (ret) | |
905 | return ret; | |
906 | chan->sys_exit_registered = 0; | |
907 | } | |
a90917c3 | 908 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 909 | kfree(chan->sc_table); |
5b7ac358 | 910 | kfree(chan->sc_exit_table); |
49c50022 MD |
911 | #ifdef CONFIG_COMPAT |
912 | kfree(chan->compat_sc_table); | |
5b7ac358 | 913 | kfree(chan->compat_sc_exit_table); |
49c50022 | 914 | #endif |
80f87dd2 MD |
915 | kfree(chan->sc_filter); |
916 | return 0; | |
917 | } | |
918 | ||
919 | static | |
920 | int get_syscall_nr(const char *syscall_name) | |
921 | { | |
922 | int syscall_nr = -1; | |
923 | int i; | |
924 | ||
925 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
926 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 927 | const char *it_name; |
80f87dd2 MD |
928 | |
929 | entry = &sc_table[i]; | |
930 | if (!entry->desc) | |
931 | continue; | |
5b7ac358 MD |
932 | it_name = entry->desc->name; |
933 | it_name += strlen(SYSCALL_ENTRY_STR); | |
934 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
935 | syscall_nr = i; |
936 | break; | |
937 | } | |
938 | } | |
939 | return syscall_nr; | |
940 | } | |
941 | ||
942 | static | |
943 | int get_compat_syscall_nr(const char *syscall_name) | |
944 | { | |
945 | int syscall_nr = -1; | |
946 | int i; | |
947 | ||
948 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
949 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 950 | const char *it_name; |
80f87dd2 MD |
951 | |
952 | entry = &compat_sc_table[i]; | |
953 | if (!entry->desc) | |
954 | continue; | |
5b7ac358 MD |
955 | it_name = entry->desc->name; |
956 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
957 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
958 | syscall_nr = i; |
959 | break; | |
960 | } | |
961 | } | |
962 | return syscall_nr; | |
963 | } | |
964 | ||
12e579db MD |
965 | static |
966 | uint32_t get_sc_tables_len(void) | |
967 | { | |
968 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
969 | } | |
970 | ||
80f87dd2 MD |
971 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
972 | const char *name) | |
973 | { | |
974 | int syscall_nr, compat_syscall_nr, ret; | |
975 | struct lttng_syscall_filter *filter; | |
976 | ||
977 | WARN_ON_ONCE(!chan->sc_table); | |
978 | ||
979 | if (!name) { | |
980 | /* Enable all system calls by removing filter */ | |
981 | if (chan->sc_filter) { | |
982 | filter = chan->sc_filter; | |
983 | rcu_assign_pointer(chan->sc_filter, NULL); | |
984 | synchronize_trace(); | |
985 | kfree(filter); | |
986 | } | |
987 | chan->syscall_all = 1; | |
988 | return 0; | |
989 | } | |
990 | ||
991 | if (!chan->sc_filter) { | |
992 | if (chan->syscall_all) { | |
993 | /* | |
994 | * All syscalls are already enabled. | |
995 | */ | |
996 | return -EEXIST; | |
997 | } | |
998 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
999 | GFP_KERNEL); | |
1000 | if (!filter) | |
1001 | return -ENOMEM; | |
1002 | } else { | |
1003 | filter = chan->sc_filter; | |
1004 | } | |
1005 | syscall_nr = get_syscall_nr(name); | |
1006 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1007 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1008 | ret = -ENOENT; | |
1009 | goto error; | |
1010 | } | |
1011 | if (syscall_nr >= 0) { | |
1012 | if (test_bit(syscall_nr, filter->sc)) { | |
1013 | ret = -EEXIST; | |
1014 | goto error; | |
1015 | } | |
1016 | bitmap_set(filter->sc, syscall_nr, 1); | |
1017 | } | |
1018 | if (compat_syscall_nr >= 0) { | |
1019 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1020 | ret = -EEXIST; | |
1021 | goto error; | |
1022 | } | |
1023 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1024 | } | |
1025 | if (!chan->sc_filter) | |
1026 | rcu_assign_pointer(chan->sc_filter, filter); | |
1027 | return 0; | |
1028 | ||
1029 | error: | |
1030 | if (!chan->sc_filter) | |
1031 | kfree(filter); | |
1032 | return ret; | |
1033 | } | |
1034 | ||
1035 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1036 | const char *name) | |
1037 | { | |
1038 | int syscall_nr, compat_syscall_nr, ret; | |
1039 | struct lttng_syscall_filter *filter; | |
1040 | ||
1041 | WARN_ON_ONCE(!chan->sc_table); | |
1042 | ||
1043 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1044 | if (!chan->syscall_all) |
1045 | return -EEXIST; | |
80f87dd2 MD |
1046 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1047 | GFP_KERNEL); | |
1048 | if (!filter) | |
1049 | return -ENOMEM; | |
1050 | /* Trace all system calls, then apply disable. */ | |
1051 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1052 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1053 | } else { | |
1054 | filter = chan->sc_filter; | |
1055 | } | |
1056 | ||
72814741 | 1057 | if (!name) { |
404e87bf MD |
1058 | /* Fail if all syscalls are already disabled. */ |
1059 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1060 | && bitmap_empty(filter->sc_compat, | |
1061 | NR_compat_syscalls)) { | |
1062 | ret = -EEXIST; | |
1063 | goto error; | |
1064 | } | |
1065 | ||
72814741 MD |
1066 | /* Disable all system calls */ |
1067 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1068 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1069 | goto apply_filter; | |
1070 | } | |
80f87dd2 MD |
1071 | syscall_nr = get_syscall_nr(name); |
1072 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1073 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1074 | ret = -ENOENT; | |
1075 | goto error; | |
1076 | } | |
1077 | if (syscall_nr >= 0) { | |
cecef7f8 | 1078 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1079 | ret = -EEXIST; |
1080 | goto error; | |
1081 | } | |
cecef7f8 | 1082 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1083 | } |
1084 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1085 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1086 | ret = -EEXIST; |
1087 | goto error; | |
1088 | } | |
cecef7f8 | 1089 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1090 | } |
72814741 | 1091 | apply_filter: |
80f87dd2 MD |
1092 | if (!chan->sc_filter) |
1093 | rcu_assign_pointer(chan->sc_filter, filter); | |
1094 | chan->syscall_all = 0; | |
259b6cb3 | 1095 | return 0; |
80f87dd2 MD |
1096 | |
1097 | error: | |
1098 | if (!chan->sc_filter) | |
1099 | kfree(filter); | |
1100 | return ret; | |
259b6cb3 | 1101 | } |
2d2464bd MD |
1102 | |
1103 | static | |
1104 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1105 | { | |
1106 | const struct trace_syscall_entry *entry; | |
1107 | int iter = 0; | |
1108 | ||
1109 | for (entry = sc_table; | |
1110 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1111 | entry++) { | |
1112 | if (iter++ >= *pos) | |
1113 | return entry; | |
1114 | } | |
1115 | for (entry = compat_sc_table; | |
1116 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1117 | entry++) { | |
1118 | if (iter++ >= *pos) | |
1119 | return entry; | |
1120 | } | |
1121 | /* End of list */ | |
1122 | return NULL; | |
1123 | } | |
1124 | ||
1125 | static | |
1126 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1127 | { | |
1128 | return (void *) syscall_list_get_entry(pos); | |
1129 | } | |
1130 | ||
1131 | static | |
1132 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1133 | { | |
1134 | (*ppos)++; | |
1135 | return (void *) syscall_list_get_entry(ppos); | |
1136 | } | |
1137 | ||
1138 | static | |
1139 | void syscall_list_stop(struct seq_file *m, void *p) | |
1140 | { | |
1141 | } | |
1142 | ||
12e579db MD |
1143 | static |
1144 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1145 | const struct trace_syscall_entry **table, | |
1146 | unsigned int *bitness) | |
1147 | { | |
1148 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1149 | if (bitness) | |
1150 | *bitness = BITS_PER_LONG; | |
1151 | if (table) | |
1152 | *table = sc_table; | |
1153 | return 0; | |
1154 | } | |
1155 | if (!(entry >= compat_sc_table | |
1156 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1157 | return -EINVAL; | |
1158 | } | |
1159 | if (bitness) | |
1160 | *bitness = 32; | |
1161 | if (table) | |
1162 | *table = compat_sc_table; | |
1163 | return 0; | |
1164 | } | |
1165 | ||
2d2464bd MD |
1166 | static |
1167 | int syscall_list_show(struct seq_file *m, void *p) | |
1168 | { | |
1169 | const struct trace_syscall_entry *table, *entry = p; | |
1170 | unsigned int bitness; | |
d4291869 | 1171 | unsigned long index; |
12e579db | 1172 | int ret; |
d4291869 | 1173 | const char *name; |
2d2464bd | 1174 | |
12e579db MD |
1175 | ret = get_sc_table(entry, &table, &bitness); |
1176 | if (ret) | |
1177 | return ret; | |
f4855b46 MD |
1178 | if (!entry->desc) |
1179 | return 0; | |
d4291869 MD |
1180 | if (table == sc_table) { |
1181 | index = entry - table; | |
1182 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1183 | } else { | |
1184 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1185 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1186 | } | |
12e579db | 1187 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1188 | index, name, bitness); |
2d2464bd MD |
1189 | return 0; |
1190 | } | |
1191 | ||
1192 | static | |
1193 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1194 | .start = syscall_list_start, | |
1195 | .next = syscall_list_next, | |
1196 | .stop = syscall_list_stop, | |
1197 | .show = syscall_list_show, | |
1198 | }; | |
1199 | ||
1200 | static | |
1201 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1202 | { | |
1203 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1204 | } | |
1205 | ||
1206 | const struct file_operations lttng_syscall_list_fops = { | |
1207 | .owner = THIS_MODULE, | |
1208 | .open = lttng_syscall_list_open, | |
1209 | .read = seq_read, | |
1210 | .llseek = seq_lseek, | |
1211 | .release = seq_release, | |
1212 | }; | |
12e579db MD |
1213 | |
1214 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1215 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1216 | { | |
1217 | uint32_t len, sc_tables_len, bitmask_len; | |
1218 | int ret = 0, bit; | |
1219 | char *tmp_mask; | |
1220 | struct lttng_syscall_filter *filter; | |
1221 | ||
1222 | ret = get_user(len, &usyscall_mask->len); | |
1223 | if (ret) | |
1224 | return ret; | |
1225 | sc_tables_len = get_sc_tables_len(); | |
1226 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1227 | if (len < sc_tables_len) { | |
1228 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1229 | } | |
1230 | /* Array is large enough, we can copy array to user-space. */ | |
1231 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1232 | if (!tmp_mask) | |
1233 | return -ENOMEM; | |
1234 | filter = channel->sc_filter; | |
1235 | ||
1236 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
2f25059d MD |
1237 | bool state; |
1238 | ||
1239 | if (channel->sc_table) { | |
1240 | if (filter) | |
1241 | state = test_bit(bit, filter->sc); | |
1242 | else | |
1243 | state = 1; | |
1244 | } else { | |
1245 | state = 0; | |
1246 | } | |
1247 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1248 | } |
1249 | for (; bit < sc_tables_len; bit++) { | |
2f25059d MD |
1250 | bool state; |
1251 | ||
1252 | if (channel->compat_sc_table) { | |
1253 | if (filter) | |
1254 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1255 | filter->sc_compat); | |
1256 | else | |
1257 | state = 1; | |
1258 | } else { | |
1259 | state = 0; | |
1260 | } | |
1261 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1262 | } |
1263 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1264 | ret = -EFAULT; | |
1265 | kfree(tmp_mask); | |
1266 | return ret; | |
1267 | } | |
7c92789f MD |
1268 | |
1269 | int lttng_abi_syscall_list(void) | |
1270 | { | |
1271 | struct file *syscall_list_file; | |
1272 | int file_fd, ret; | |
1273 | ||
14a4b602 | 1274 | file_fd = lttng_get_unused_fd(); |
7c92789f MD |
1275 | if (file_fd < 0) { |
1276 | ret = file_fd; | |
1277 | goto fd_error; | |
1278 | } | |
1279 | ||
1280 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1281 | <tng_syscall_list_fops, | |
1282 | NULL, O_RDWR); | |
1283 | if (IS_ERR(syscall_list_file)) { | |
1284 | ret = PTR_ERR(syscall_list_file); | |
1285 | goto file_error; | |
1286 | } | |
1287 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1288 | if (ret < 0) | |
1289 | goto open_error; | |
1290 | fd_install(file_fd, syscall_list_file); | |
1291 | if (file_fd < 0) { | |
1292 | ret = file_fd; | |
1293 | goto fd_error; | |
1294 | } | |
1295 | return file_fd; | |
1296 | ||
1297 | open_error: | |
1298 | fput(syscall_list_file); | |
1299 | file_error: | |
1300 | put_unused_fd(file_fd); | |
1301 | fd_error: | |
1302 | return ret; | |
1303 | } |