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> |
259b6cb3 MD |
32 | #include <asm/ptrace.h> |
33 | #include <asm/syscall.h> | |
34 | ||
12e579db | 35 | #include "lib/bitfield.h" |
3a523f5b | 36 | #include "wrapper/tracepoint.h" |
a90917c3 | 37 | #include "lttng-events.h" |
259b6cb3 | 38 | |
6333ace3 | 39 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
40 | # ifndef is_compat_task |
41 | # define is_compat_task() (0) | |
42 | # endif | |
6333ace3 MD |
43 | #endif |
44 | ||
5b7ac358 MD |
45 | enum sc_type { |
46 | SC_TYPE_ENTRY, | |
47 | SC_TYPE_EXIT, | |
48 | SC_TYPE_COMPAT_ENTRY, | |
49 | SC_TYPE_COMPAT_EXIT, | |
50 | }; | |
51 | ||
d4291869 MD |
52 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
53 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
54 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
55 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
56 | ||
57 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
58 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
59 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
60 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 61 | |
a93244f8 | 62 | static |
2faf7d1b | 63 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
64 | static |
65 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 66 | |
3a523f5b MD |
67 | /* |
68 | * Forward declarations for old kernels. | |
69 | */ | |
70 | struct mmsghdr; | |
71 | struct rlimit64; | |
72 | struct oldold_utsname; | |
73 | struct old_utsname; | |
74 | struct sel_arg_struct; | |
75 | struct mmap_arg_struct; | |
76 | ||
80f87dd2 MD |
77 | #ifdef IA32_NR_syscalls |
78 | #define NR_compat_syscalls IA32_NR_syscalls | |
79 | #else | |
80 | #define NR_compat_syscalls NR_syscalls | |
81 | #endif | |
82 | ||
259b6cb3 MD |
83 | /* |
84 | * Create LTTng tracepoint probes. | |
85 | */ | |
86 | #define LTTNG_PACKAGE_BUILD | |
87 | #define CREATE_TRACE_POINTS | |
2655f9ad | 88 | #define TP_MODULE_NOINIT |
2f804c0a | 89 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 90 | |
a93244f8 MD |
91 | #define PARAMS(args...) args |
92 | ||
5b7ac358 | 93 | /* Handle unknown syscalls */ |
72a52753 | 94 | #undef TRACE_SYSTEM |
5b7ac358 MD |
95 | #define TRACE_SYSTEM syscalls_unknown |
96 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
97 | #undef TRACE_SYSTEM | |
98 | ||
fc4f7161 MD |
99 | #define SC_ENTER |
100 | ||
fc4f7161 MD |
101 | #undef sc_exit |
102 | #define sc_exit(...) | |
b75d00c4 MD |
103 | #undef sc_in |
104 | #define sc_in(...) __VA_ARGS__ | |
105 | #undef sc_out | |
106 | #define sc_out(...) | |
107 | #undef sc_inout | |
108 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
109 | |
110 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 111 | #undef TP_PROBE_CB |
259b6cb3 | 112 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 113 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
d4291869 | 114 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 | 115 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 116 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
d4291869 | 117 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 118 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 119 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 120 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
d4291869 | 121 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 122 | PARAMS(_printk)) |
cb3ef14c | 123 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 124 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
a93244f8 | 125 | #undef TRACE_SYSTEM |
d4291869 | 126 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 127 | #define TRACE_INCLUDE_FILE syscalls_integers |
177b3692 | 128 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 129 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 130 | #undef TRACE_SYSTEM |
d4291869 | 131 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 132 | #define TRACE_INCLUDE_FILE syscalls_pointers |
177b3692 | 133 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 134 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 135 | #undef TRACE_SYSTEM |
cb3ef14c MD |
136 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
137 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
138 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
139 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 140 | #undef TP_PROBE_CB |
3bc29f0a MD |
141 | #undef _TRACE_SYSCALLS_INTEGERS_H |
142 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
143 | |
144 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 145 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 146 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
d4291869 | 147 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 148 | PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 149 | PARAMS(_printk)) |
cb3ef14c | 150 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
d4291869 | 151 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 152 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 153 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 154 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
d4291869 | 155 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_struct), \ |
5b7ac358 | 156 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 157 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
158 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
159 | compat_syscall_entry_##_name) | |
160 | #define TRACE_SYSTEM compat_syscall_entry_integers | |
5b7ac358 MD |
161 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
162 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
163 | #undef TRACE_INCLUDE_FILE | |
164 | #undef TRACE_SYSTEM | |
d4291869 | 165 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 MD |
166 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
167 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
168 | #undef TRACE_INCLUDE_FILE | |
169 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
170 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
171 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
172 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
173 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 174 | #undef TP_PROBE_CB |
3bc29f0a MD |
175 | #undef _TRACE_SYSCALLS_INTEGERS_H |
176 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 177 | |
fc4f7161 MD |
178 | #undef SC_ENTER |
179 | ||
180 | #define SC_EXIT | |
181 | ||
fc4f7161 MD |
182 | #undef sc_exit |
183 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
184 | #undef sc_in |
185 | #define sc_in(...) | |
186 | #undef sc_out | |
187 | #define sc_out(...) __VA_ARGS__ | |
188 | #undef sc_inout | |
189 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
190 | |
191 | /* Hijack probe callback for system call exit */ | |
192 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 193 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 194 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 195 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 196 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 197 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 198 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 199 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 200 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 201 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \ |
5b7ac358 | 202 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c MD |
203 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
204 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 MD |
205 | syscall_exit_##_name) |
206 | #define TRACE_SYSTEM syscall_exit_integers | |
207 | #define TRACE_INCLUDE_FILE syscalls_integers | |
208 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
209 | #undef TRACE_INCLUDE_FILE | |
210 | #undef TRACE_SYSTEM | |
211 | #define TRACE_SYSTEM syscall_exit_pointers | |
212 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
213 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
214 | #undef TRACE_INCLUDE_FILE | |
215 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
216 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
217 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
218 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
219 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 220 | #undef TP_PROBE_CB |
3bc29f0a MD |
221 | #undef _TRACE_SYSCALLS_INTEGERS_H |
222 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
223 | |
224 | ||
225 | /* Hijack probe callback for compat system call exit */ | |
226 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 227 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 228 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 229 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 230 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 231 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 232 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 233 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 234 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 235 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \ |
a93244f8 | 236 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 237 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 238 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 MD |
239 | compat_syscall_exit_##_name) |
240 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
241 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 242 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 243 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 244 | #undef TRACE_SYSTEM |
5b7ac358 MD |
245 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
246 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 247 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 248 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 249 | #undef TRACE_SYSTEM |
cb3ef14c MD |
250 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
251 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
252 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
253 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 254 | #undef TP_PROBE_CB |
3bc29f0a MD |
255 | #undef _TRACE_SYSCALLS_INTEGERS_H |
256 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 257 | |
fc4f7161 | 258 | #undef SC_EXIT |
259b6cb3 | 259 | |
2655f9ad | 260 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
261 | #undef LTTNG_PACKAGE_BUILD |
262 | #undef CREATE_TRACE_POINTS | |
263 | ||
a93244f8 MD |
264 | struct trace_syscall_entry { |
265 | void *func; | |
266 | const struct lttng_event_desc *desc; | |
267 | const struct lttng_event_field *fields; | |
268 | unsigned int nrargs; | |
269 | }; | |
270 | ||
271 | #define CREATE_SYSCALL_TABLE | |
272 | ||
fc4f7161 MD |
273 | #define SC_ENTER |
274 | ||
275 | #undef sc_exit | |
276 | #define sc_exit(...) | |
277 | ||
259b6cb3 | 278 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 279 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 280 | [ _nr ] = { \ |
d4291869 | 281 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 282 | .nrargs = (_nrargs), \ |
d4291869 MD |
283 | .fields = __event_fields___syscall_entry_##_template, \ |
284 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
285 | }, |
286 | ||
5b7ac358 | 287 | /* Syscall enter tracing table */ |
49c50022 | 288 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
289 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
290 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
291 | }; |
292 | ||
a93244f8 MD |
293 | #undef TRACE_SYSCALL_TABLE |
294 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
295 | [ _nr ] = { \ | |
d4291869 | 296 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 297 | .nrargs = (_nrargs), \ |
d4291869 MD |
298 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
299 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
300 | }, |
301 | ||
5b7ac358 | 302 | /* Compat syscall enter table */ |
a93244f8 MD |
303 | const struct trace_syscall_entry compat_sc_table[] = { |
304 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
305 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
306 | }; | |
259b6cb3 | 307 | |
fc4f7161 MD |
308 | #undef SC_ENTER |
309 | ||
310 | #define SC_EXIT | |
311 | ||
312 | #undef sc_exit | |
313 | #define sc_exit(...) __VA_ARGS__ | |
314 | ||
5b7ac358 MD |
315 | #undef TRACE_SYSCALL_TABLE |
316 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
317 | [ _nr ] = { \ | |
318 | .func = __event_probe__syscall_exit_##_template, \ | |
319 | .nrargs = (_nrargs), \ | |
320 | .fields = __event_fields___syscall_exit_##_template, \ | |
321 | .desc = &__event_desc___syscall_exit_##_name, \ | |
322 | }, | |
323 | ||
324 | /* Syscall exit table */ | |
325 | static const struct trace_syscall_entry sc_exit_table[] = { | |
326 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
327 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
328 | }; | |
329 | ||
330 | #undef TRACE_SYSCALL_TABLE | |
331 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
332 | [ _nr ] = { \ | |
333 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
334 | .nrargs = (_nrargs), \ | |
335 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
336 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
337 | }, | |
338 | ||
339 | /* Compat syscall exit table */ | |
340 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
341 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
342 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
343 | }; | |
344 | ||
fc4f7161 MD |
345 | #undef SC_EXIT |
346 | ||
a93244f8 | 347 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 348 | |
80f87dd2 MD |
349 | struct lttng_syscall_filter { |
350 | DECLARE_BITMAP(sc, NR_syscalls); | |
351 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
352 | }; | |
353 | ||
a90917c3 | 354 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
355 | struct pt_regs *regs, unsigned int id) |
356 | { | |
357 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 358 | |
f405cfce | 359 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 360 | if (unlikely(is_compat_task())) |
d4291869 | 361 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 362 | else |
d4291869 | 363 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
364 | } |
365 | ||
2faf7d1b | 366 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 367 | { |
a90917c3 MD |
368 | struct lttng_channel *chan = __data; |
369 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
370 | const struct trace_syscall_entry *table, *entry; |
371 | size_t table_len; | |
259b6cb3 | 372 | |
b76dc1a0 | 373 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
374 | struct lttng_syscall_filter *filter; |
375 | ||
376 | filter = rcu_dereference(chan->sc_filter); | |
377 | if (filter) { | |
74f7b56a | 378 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
379 | || !test_bit(id, filter->sc_compat)) { |
380 | /* System call filtered out. */ | |
381 | return; | |
382 | } | |
383 | } | |
49c50022 | 384 | table = compat_sc_table; |
a93244f8 | 385 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
386 | unknown_event = chan->sc_compat_unknown; |
387 | } else { | |
80f87dd2 MD |
388 | struct lttng_syscall_filter *filter; |
389 | ||
390 | filter = rcu_dereference(chan->sc_filter); | |
391 | if (filter) { | |
74f7b56a | 392 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
393 | || !test_bit(id, filter->sc)) { |
394 | /* System call filtered out. */ | |
395 | return; | |
396 | } | |
397 | } | |
49c50022 MD |
398 | table = sc_table; |
399 | table_len = ARRAY_SIZE(sc_table); | |
400 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 401 | } |
74f7b56a | 402 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 403 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 404 | return; |
f405cfce | 405 | } |
49c50022 MD |
406 | if (unlikely(is_compat_task())) |
407 | event = chan->compat_sc_table[id]; | |
408 | else | |
409 | event = chan->sc_table[id]; | |
f405cfce | 410 | if (unlikely(!event)) { |
49c50022 | 411 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
412 | return; |
413 | } | |
49c50022 | 414 | entry = &table[id]; |
f405cfce | 415 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
416 | |
417 | switch (entry->nrargs) { | |
418 | case 0: | |
419 | { | |
420 | void (*fptr)(void *__data) = entry->func; | |
421 | ||
422 | fptr(event); | |
423 | break; | |
424 | } | |
425 | case 1: | |
426 | { | |
427 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
428 | unsigned long args[1]; | |
429 | ||
430 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
431 | fptr(event, args[0]); | |
432 | break; | |
433 | } | |
434 | case 2: | |
435 | { | |
436 | void (*fptr)(void *__data, | |
437 | unsigned long arg0, | |
438 | unsigned long arg1) = entry->func; | |
439 | unsigned long args[2]; | |
440 | ||
441 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
442 | fptr(event, args[0], args[1]); | |
443 | break; | |
444 | } | |
445 | case 3: | |
446 | { | |
447 | void (*fptr)(void *__data, | |
448 | unsigned long arg0, | |
449 | unsigned long arg1, | |
450 | unsigned long arg2) = entry->func; | |
451 | unsigned long args[3]; | |
452 | ||
453 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
454 | fptr(event, args[0], args[1], args[2]); | |
455 | break; | |
456 | } | |
457 | case 4: | |
458 | { | |
459 | void (*fptr)(void *__data, | |
460 | unsigned long arg0, | |
461 | unsigned long arg1, | |
462 | unsigned long arg2, | |
463 | unsigned long arg3) = entry->func; | |
464 | unsigned long args[4]; | |
465 | ||
466 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
467 | fptr(event, args[0], args[1], args[2], args[3]); | |
468 | break; | |
469 | } | |
470 | case 5: | |
471 | { | |
472 | void (*fptr)(void *__data, | |
473 | unsigned long arg0, | |
474 | unsigned long arg1, | |
475 | unsigned long arg2, | |
476 | unsigned long arg3, | |
477 | unsigned long arg4) = entry->func; | |
478 | unsigned long args[5]; | |
479 | ||
480 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
481 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
482 | break; | |
483 | } | |
484 | case 6: | |
485 | { | |
486 | void (*fptr)(void *__data, | |
487 | unsigned long arg0, | |
488 | unsigned long arg1, | |
489 | unsigned long arg2, | |
490 | unsigned long arg3, | |
491 | unsigned long arg4, | |
492 | unsigned long arg5) = entry->func; | |
493 | unsigned long args[6]; | |
494 | ||
495 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
496 | fptr(event, args[0], args[1], args[2], | |
497 | args[3], args[4], args[5]); | |
498 | break; | |
499 | } | |
500 | default: | |
501 | break; | |
502 | } | |
503 | } | |
504 | ||
5b7ac358 | 505 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 506 | struct pt_regs *regs, int id, long ret) |
5b7ac358 MD |
507 | { |
508 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
509 | ||
510 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
511 | if (unlikely(is_compat_task())) | |
512 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
513 | args); | |
514 | else | |
515 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
516 | } | |
517 | ||
518 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
519 | { | |
520 | struct lttng_channel *chan = __data; | |
521 | struct lttng_event *event, *unknown_event; | |
522 | const struct trace_syscall_entry *table, *entry; | |
523 | size_t table_len; | |
524 | long id; | |
525 | ||
526 | id = syscall_get_nr(current, regs); | |
527 | if (unlikely(is_compat_task())) { | |
528 | struct lttng_syscall_filter *filter; | |
529 | ||
530 | filter = rcu_dereference(chan->sc_filter); | |
531 | if (filter) { | |
74f7b56a | 532 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
533 | || !test_bit(id, filter->sc_compat)) { |
534 | /* System call filtered out. */ | |
535 | return; | |
536 | } | |
537 | } | |
538 | table = compat_sc_exit_table; | |
539 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
540 | unknown_event = chan->compat_sc_exit_unknown; | |
541 | } else { | |
542 | struct lttng_syscall_filter *filter; | |
543 | ||
544 | filter = rcu_dereference(chan->sc_filter); | |
545 | if (filter) { | |
74f7b56a | 546 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
547 | || !test_bit(id, filter->sc)) { |
548 | /* System call filtered out. */ | |
549 | return; | |
550 | } | |
551 | } | |
552 | table = sc_exit_table; | |
553 | table_len = ARRAY_SIZE(sc_exit_table); | |
554 | unknown_event = chan->sc_exit_unknown; | |
555 | } | |
74f7b56a | 556 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
557 | syscall_exit_unknown(unknown_event, regs, id, ret); |
558 | return; | |
559 | } | |
560 | if (unlikely(is_compat_task())) | |
561 | event = chan->compat_sc_exit_table[id]; | |
562 | else | |
563 | event = chan->sc_exit_table[id]; | |
564 | if (unlikely(!event)) { | |
565 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
566 | return; | |
567 | } | |
568 | entry = &table[id]; | |
569 | WARN_ON_ONCE(!entry); | |
570 | ||
571 | switch (entry->nrargs) { | |
572 | case 0: | |
573 | { | |
fc4f7161 | 574 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 575 | |
fc4f7161 | 576 | fptr(event, ret); |
5b7ac358 MD |
577 | break; |
578 | } | |
579 | case 1: | |
580 | { | |
581 | void (*fptr)(void *__data, | |
fc4f7161 | 582 | long ret, |
5b7ac358 MD |
583 | unsigned long arg0) = entry->func; |
584 | unsigned long args[1]; | |
585 | ||
586 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 587 | fptr(event, ret, args[0]); |
5b7ac358 MD |
588 | break; |
589 | } | |
590 | case 2: | |
591 | { | |
592 | void (*fptr)(void *__data, | |
fc4f7161 | 593 | long ret, |
5b7ac358 MD |
594 | unsigned long arg0, |
595 | unsigned long arg1) = entry->func; | |
596 | unsigned long args[2]; | |
597 | ||
598 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 599 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
600 | break; |
601 | } | |
602 | case 3: | |
603 | { | |
604 | void (*fptr)(void *__data, | |
fc4f7161 | 605 | long ret, |
5b7ac358 MD |
606 | unsigned long arg0, |
607 | unsigned long arg1, | |
608 | unsigned long arg2) = entry->func; | |
609 | unsigned long args[3]; | |
610 | ||
611 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 612 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
613 | break; |
614 | } | |
615 | case 4: | |
616 | { | |
617 | void (*fptr)(void *__data, | |
fc4f7161 | 618 | long ret, |
5b7ac358 MD |
619 | unsigned long arg0, |
620 | unsigned long arg1, | |
621 | unsigned long arg2, | |
622 | unsigned long arg3) = entry->func; | |
623 | unsigned long args[4]; | |
624 | ||
625 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 626 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
627 | break; |
628 | } | |
629 | case 5: | |
630 | { | |
631 | void (*fptr)(void *__data, | |
fc4f7161 | 632 | long ret, |
5b7ac358 MD |
633 | unsigned long arg0, |
634 | unsigned long arg1, | |
635 | unsigned long arg2, | |
636 | unsigned long arg3, | |
637 | unsigned long arg4) = entry->func; | |
638 | unsigned long args[5]; | |
639 | ||
640 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 641 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
642 | break; |
643 | } | |
644 | case 6: | |
645 | { | |
646 | void (*fptr)(void *__data, | |
fc4f7161 | 647 | long ret, |
5b7ac358 MD |
648 | unsigned long arg0, |
649 | unsigned long arg1, | |
650 | unsigned long arg2, | |
651 | unsigned long arg3, | |
652 | unsigned long arg4, | |
653 | unsigned long arg5) = entry->func; | |
654 | unsigned long args[6]; | |
655 | ||
656 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 657 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
658 | args[3], args[4], args[5]); |
659 | break; | |
660 | } | |
661 | default: | |
662 | break; | |
663 | } | |
664 | } | |
665 | ||
2a0c4816 | 666 | /* noinline to diminish caller stack size */ |
49c50022 MD |
667 | static |
668 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
669 | struct lttng_event **chan_table, struct lttng_channel *chan, |
670 | void *filter, enum sc_type type) | |
259b6cb3 | 671 | { |
2a0c4816 | 672 | const struct lttng_event_desc *desc; |
259b6cb3 | 673 | unsigned int i; |
49c50022 MD |
674 | |
675 | /* Allocate events for each syscall, insert into table */ | |
676 | for (i = 0; i < table_len; i++) { | |
677 | struct lttng_kernel_event ev; | |
2a0c4816 | 678 | desc = table[i].desc; |
49c50022 MD |
679 | |
680 | if (!desc) { | |
681 | /* Unknown syscall */ | |
682 | continue; | |
683 | } | |
684 | /* | |
685 | * Skip those already populated by previous failed | |
686 | * register for this channel. | |
687 | */ | |
688 | if (chan_table[i]) | |
689 | continue; | |
690 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
691 | switch (type) { |
692 | case SC_TYPE_ENTRY: | |
693 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
694 | LTTNG_KERNEL_SYM_NAME_LEN); | |
695 | break; | |
696 | case SC_TYPE_EXIT: | |
697 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
698 | LTTNG_KERNEL_SYM_NAME_LEN); | |
699 | break; | |
700 | case SC_TYPE_COMPAT_ENTRY: | |
701 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
702 | LTTNG_KERNEL_SYM_NAME_LEN); | |
703 | break; | |
704 | case SC_TYPE_COMPAT_EXIT: | |
705 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
706 | LTTNG_KERNEL_SYM_NAME_LEN); | |
707 | break; | |
708 | default: | |
709 | BUG_ON(1); | |
710 | break; | |
711 | } | |
712 | strncat(ev.name, desc->name, | |
713 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 714 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
49c50022 | 715 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 716 | chan_table[i] = lttng_event_create(chan, &ev, filter, |
49c50022 | 717 | desc); |
abc0446a MD |
718 | WARN_ON_ONCE(!chan_table[i]); |
719 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
720 | /* |
721 | * If something goes wrong in event registration | |
722 | * after the first one, we have no choice but to | |
723 | * leave the previous events in there, until | |
724 | * deleted by session teardown. | |
725 | */ | |
abc0446a | 726 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
727 | } |
728 | } | |
729 | return 0; | |
730 | } | |
731 | ||
a90917c3 | 732 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 733 | { |
2a0c4816 | 734 | struct lttng_kernel_event ev; |
259b6cb3 MD |
735 | int ret; |
736 | ||
737 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
738 | |
739 | if (!chan->sc_table) { | |
740 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 741 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
742 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
743 | if (!chan->sc_table) | |
744 | return -ENOMEM; | |
745 | } | |
5b7ac358 MD |
746 | if (!chan->sc_exit_table) { |
747 | /* create syscall table mapping syscall to events */ | |
748 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
749 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
750 | if (!chan->sc_exit_table) | |
751 | return -ENOMEM; | |
752 | } | |
753 | ||
259b6cb3 | 754 | |
49c50022 MD |
755 | #ifdef CONFIG_COMPAT |
756 | if (!chan->compat_sc_table) { | |
757 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 758 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 759 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
760 | if (!chan->compat_sc_table) |
761 | return -ENOMEM; | |
762 | } | |
5b7ac358 MD |
763 | |
764 | if (!chan->compat_sc_exit_table) { | |
765 | /* create syscall table mapping compat syscall to events */ | |
766 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
767 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
768 | if (!chan->compat_sc_exit_table) | |
769 | return -ENOMEM; | |
770 | } | |
49c50022 | 771 | #endif |
f405cfce | 772 | if (!chan->sc_unknown) { |
f405cfce | 773 | const struct lttng_event_desc *desc = |
d4291869 | 774 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 775 | |
f405cfce | 776 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
777 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
778 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f405cfce | 779 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 780 | chan->sc_unknown = lttng_event_create(chan, &ev, filter, |
f405cfce | 781 | desc); |
abc0446a MD |
782 | WARN_ON_ONCE(!chan->sc_unknown); |
783 | if (IS_ERR(chan->sc_unknown)) { | |
784 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
785 | } |
786 | } | |
787 | ||
b76dc1a0 | 788 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 789 | const struct lttng_event_desc *desc = |
d4291869 | 790 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
791 | |
792 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
793 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
794 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
b76dc1a0 | 795 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 796 | chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter, |
b76dc1a0 | 797 | desc); |
abc0446a MD |
798 | WARN_ON_ONCE(!chan->sc_unknown); |
799 | if (IS_ERR(chan->sc_compat_unknown)) { | |
800 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
801 | } |
802 | } | |
803 | ||
5b7ac358 | 804 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 805 | const struct lttng_event_desc *desc = |
5b7ac358 | 806 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
807 | |
808 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
809 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
810 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2f804c0a | 811 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
5b7ac358 MD |
812 | chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev, |
813 | filter, desc); | |
814 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); | |
815 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
816 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
817 | } | |
818 | } | |
819 | ||
820 | if (!chan->sc_exit_unknown) { | |
821 | const struct lttng_event_desc *desc = | |
822 | &__event_desc___syscall_exit_unknown; | |
823 | ||
824 | memset(&ev, 0, sizeof(ev)); | |
825 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
826 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
827 | ev.instrumentation = LTTNG_KERNEL_NOOP; | |
828 | chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter, | |
2f804c0a | 829 | desc); |
5b7ac358 MD |
830 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
831 | if (IS_ERR(chan->sc_exit_unknown)) { | |
832 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
833 | } |
834 | } | |
835 | ||
49c50022 | 836 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
837 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
838 | if (ret) | |
839 | return ret; | |
840 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
841 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
842 | if (ret) |
843 | return ret; | |
5b7ac358 | 844 | |
49c50022 | 845 | #ifdef CONFIG_COMPAT |
a93244f8 | 846 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
847 | chan->compat_sc_table, chan, filter, |
848 | SC_TYPE_COMPAT_ENTRY); | |
849 | if (ret) | |
850 | return ret; | |
851 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
852 | chan->compat_sc_exit_table, chan, filter, | |
853 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
854 | if (ret) |
855 | return ret; | |
856 | #endif | |
80f87dd2 MD |
857 | if (!chan->sys_enter_registered) { |
858 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
859 | (void *) syscall_entry_probe, chan); | |
860 | if (ret) | |
861 | return ret; | |
862 | chan->sys_enter_registered = 1; | |
863 | } | |
63728b02 MD |
864 | /* |
865 | * We change the name of sys_exit tracepoint due to namespace | |
866 | * conflict with sys_exit syscall entry. | |
867 | */ | |
80f87dd2 MD |
868 | if (!chan->sys_exit_registered) { |
869 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 870 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
871 | if (ret) { |
872 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
873 | (void *) syscall_entry_probe, chan)); | |
874 | return ret; | |
875 | } | |
876 | chan->sys_exit_registered = 1; | |
63728b02 | 877 | } |
259b6cb3 MD |
878 | return ret; |
879 | } | |
880 | ||
881 | /* | |
882 | * Only called at session destruction. | |
883 | */ | |
a90917c3 | 884 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
885 | { |
886 | int ret; | |
887 | ||
888 | if (!chan->sc_table) | |
889 | return 0; | |
80f87dd2 MD |
890 | if (chan->sys_enter_registered) { |
891 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 892 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
893 | if (ret) |
894 | return ret; | |
895 | chan->sys_enter_registered = 0; | |
896 | } | |
897 | if (chan->sys_exit_registered) { | |
898 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
899 | (void *) syscall_entry_probe, chan); | |
900 | if (ret) | |
901 | return ret; | |
902 | chan->sys_exit_registered = 0; | |
903 | } | |
a90917c3 | 904 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 905 | kfree(chan->sc_table); |
5b7ac358 | 906 | kfree(chan->sc_exit_table); |
49c50022 MD |
907 | #ifdef CONFIG_COMPAT |
908 | kfree(chan->compat_sc_table); | |
5b7ac358 | 909 | kfree(chan->compat_sc_exit_table); |
49c50022 | 910 | #endif |
80f87dd2 MD |
911 | kfree(chan->sc_filter); |
912 | return 0; | |
913 | } | |
914 | ||
915 | static | |
916 | int get_syscall_nr(const char *syscall_name) | |
917 | { | |
918 | int syscall_nr = -1; | |
919 | int i; | |
920 | ||
921 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
922 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 923 | const char *it_name; |
80f87dd2 MD |
924 | |
925 | entry = &sc_table[i]; | |
926 | if (!entry->desc) | |
927 | continue; | |
5b7ac358 MD |
928 | it_name = entry->desc->name; |
929 | it_name += strlen(SYSCALL_ENTRY_STR); | |
930 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
931 | syscall_nr = i; |
932 | break; | |
933 | } | |
934 | } | |
935 | return syscall_nr; | |
936 | } | |
937 | ||
938 | static | |
939 | int get_compat_syscall_nr(const char *syscall_name) | |
940 | { | |
941 | int syscall_nr = -1; | |
942 | int i; | |
943 | ||
944 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
945 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 946 | const char *it_name; |
80f87dd2 MD |
947 | |
948 | entry = &compat_sc_table[i]; | |
949 | if (!entry->desc) | |
950 | continue; | |
5b7ac358 MD |
951 | it_name = entry->desc->name; |
952 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
953 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
954 | syscall_nr = i; |
955 | break; | |
956 | } | |
957 | } | |
958 | return syscall_nr; | |
959 | } | |
960 | ||
12e579db MD |
961 | static |
962 | uint32_t get_sc_tables_len(void) | |
963 | { | |
964 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
965 | } | |
966 | ||
80f87dd2 MD |
967 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
968 | const char *name) | |
969 | { | |
970 | int syscall_nr, compat_syscall_nr, ret; | |
971 | struct lttng_syscall_filter *filter; | |
972 | ||
973 | WARN_ON_ONCE(!chan->sc_table); | |
974 | ||
975 | if (!name) { | |
976 | /* Enable all system calls by removing filter */ | |
977 | if (chan->sc_filter) { | |
978 | filter = chan->sc_filter; | |
979 | rcu_assign_pointer(chan->sc_filter, NULL); | |
980 | synchronize_trace(); | |
981 | kfree(filter); | |
982 | } | |
983 | chan->syscall_all = 1; | |
984 | return 0; | |
985 | } | |
986 | ||
987 | if (!chan->sc_filter) { | |
988 | if (chan->syscall_all) { | |
989 | /* | |
990 | * All syscalls are already enabled. | |
991 | */ | |
992 | return -EEXIST; | |
993 | } | |
994 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
995 | GFP_KERNEL); | |
996 | if (!filter) | |
997 | return -ENOMEM; | |
998 | } else { | |
999 | filter = chan->sc_filter; | |
1000 | } | |
1001 | syscall_nr = get_syscall_nr(name); | |
1002 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1003 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1004 | ret = -ENOENT; | |
1005 | goto error; | |
1006 | } | |
1007 | if (syscall_nr >= 0) { | |
1008 | if (test_bit(syscall_nr, filter->sc)) { | |
1009 | ret = -EEXIST; | |
1010 | goto error; | |
1011 | } | |
1012 | bitmap_set(filter->sc, syscall_nr, 1); | |
1013 | } | |
1014 | if (compat_syscall_nr >= 0) { | |
1015 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1016 | ret = -EEXIST; | |
1017 | goto error; | |
1018 | } | |
1019 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1020 | } | |
1021 | if (!chan->sc_filter) | |
1022 | rcu_assign_pointer(chan->sc_filter, filter); | |
1023 | return 0; | |
1024 | ||
1025 | error: | |
1026 | if (!chan->sc_filter) | |
1027 | kfree(filter); | |
1028 | return ret; | |
1029 | } | |
1030 | ||
1031 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1032 | const char *name) | |
1033 | { | |
1034 | int syscall_nr, compat_syscall_nr, ret; | |
1035 | struct lttng_syscall_filter *filter; | |
1036 | ||
1037 | WARN_ON_ONCE(!chan->sc_table); | |
1038 | ||
1039 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1040 | if (!chan->syscall_all) |
1041 | return -EEXIST; | |
80f87dd2 MD |
1042 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1043 | GFP_KERNEL); | |
1044 | if (!filter) | |
1045 | return -ENOMEM; | |
1046 | /* Trace all system calls, then apply disable. */ | |
1047 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1048 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1049 | } else { | |
1050 | filter = chan->sc_filter; | |
1051 | } | |
1052 | ||
72814741 | 1053 | if (!name) { |
404e87bf MD |
1054 | /* Fail if all syscalls are already disabled. */ |
1055 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1056 | && bitmap_empty(filter->sc_compat, | |
1057 | NR_compat_syscalls)) { | |
1058 | ret = -EEXIST; | |
1059 | goto error; | |
1060 | } | |
1061 | ||
72814741 MD |
1062 | /* Disable all system calls */ |
1063 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1064 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1065 | goto apply_filter; | |
1066 | } | |
80f87dd2 MD |
1067 | syscall_nr = get_syscall_nr(name); |
1068 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1069 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1070 | ret = -ENOENT; | |
1071 | goto error; | |
1072 | } | |
1073 | if (syscall_nr >= 0) { | |
cecef7f8 | 1074 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1075 | ret = -EEXIST; |
1076 | goto error; | |
1077 | } | |
cecef7f8 | 1078 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1079 | } |
1080 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1081 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1082 | ret = -EEXIST; |
1083 | goto error; | |
1084 | } | |
cecef7f8 | 1085 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1086 | } |
72814741 | 1087 | apply_filter: |
80f87dd2 MD |
1088 | if (!chan->sc_filter) |
1089 | rcu_assign_pointer(chan->sc_filter, filter); | |
1090 | chan->syscall_all = 0; | |
259b6cb3 | 1091 | return 0; |
80f87dd2 MD |
1092 | |
1093 | error: | |
1094 | if (!chan->sc_filter) | |
1095 | kfree(filter); | |
1096 | return ret; | |
259b6cb3 | 1097 | } |
2d2464bd MD |
1098 | |
1099 | static | |
1100 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1101 | { | |
1102 | const struct trace_syscall_entry *entry; | |
1103 | int iter = 0; | |
1104 | ||
1105 | for (entry = sc_table; | |
1106 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1107 | entry++) { | |
1108 | if (iter++ >= *pos) | |
1109 | return entry; | |
1110 | } | |
1111 | for (entry = compat_sc_table; | |
1112 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1113 | entry++) { | |
1114 | if (iter++ >= *pos) | |
1115 | return entry; | |
1116 | } | |
1117 | /* End of list */ | |
1118 | return NULL; | |
1119 | } | |
1120 | ||
1121 | static | |
1122 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1123 | { | |
1124 | return (void *) syscall_list_get_entry(pos); | |
1125 | } | |
1126 | ||
1127 | static | |
1128 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1129 | { | |
1130 | (*ppos)++; | |
1131 | return (void *) syscall_list_get_entry(ppos); | |
1132 | } | |
1133 | ||
1134 | static | |
1135 | void syscall_list_stop(struct seq_file *m, void *p) | |
1136 | { | |
1137 | } | |
1138 | ||
12e579db MD |
1139 | static |
1140 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1141 | const struct trace_syscall_entry **table, | |
1142 | unsigned int *bitness) | |
1143 | { | |
1144 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1145 | if (bitness) | |
1146 | *bitness = BITS_PER_LONG; | |
1147 | if (table) | |
1148 | *table = sc_table; | |
1149 | return 0; | |
1150 | } | |
1151 | if (!(entry >= compat_sc_table | |
1152 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1153 | return -EINVAL; | |
1154 | } | |
1155 | if (bitness) | |
1156 | *bitness = 32; | |
1157 | if (table) | |
1158 | *table = compat_sc_table; | |
1159 | return 0; | |
1160 | } | |
1161 | ||
2d2464bd MD |
1162 | static |
1163 | int syscall_list_show(struct seq_file *m, void *p) | |
1164 | { | |
1165 | const struct trace_syscall_entry *table, *entry = p; | |
1166 | unsigned int bitness; | |
d4291869 | 1167 | unsigned long index; |
12e579db | 1168 | int ret; |
d4291869 | 1169 | const char *name; |
2d2464bd | 1170 | |
12e579db MD |
1171 | ret = get_sc_table(entry, &table, &bitness); |
1172 | if (ret) | |
1173 | return ret; | |
f4855b46 MD |
1174 | if (!entry->desc) |
1175 | return 0; | |
d4291869 MD |
1176 | if (table == sc_table) { |
1177 | index = entry - table; | |
1178 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1179 | } else { | |
1180 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1181 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1182 | } | |
12e579db | 1183 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1184 | index, name, bitness); |
2d2464bd MD |
1185 | return 0; |
1186 | } | |
1187 | ||
1188 | static | |
1189 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1190 | .start = syscall_list_start, | |
1191 | .next = syscall_list_next, | |
1192 | .stop = syscall_list_stop, | |
1193 | .show = syscall_list_show, | |
1194 | }; | |
1195 | ||
1196 | static | |
1197 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1198 | { | |
1199 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1200 | } | |
1201 | ||
1202 | const struct file_operations lttng_syscall_list_fops = { | |
1203 | .owner = THIS_MODULE, | |
1204 | .open = lttng_syscall_list_open, | |
1205 | .read = seq_read, | |
1206 | .llseek = seq_lseek, | |
1207 | .release = seq_release, | |
1208 | }; | |
12e579db MD |
1209 | |
1210 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1211 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1212 | { | |
1213 | uint32_t len, sc_tables_len, bitmask_len; | |
1214 | int ret = 0, bit; | |
1215 | char *tmp_mask; | |
1216 | struct lttng_syscall_filter *filter; | |
1217 | ||
1218 | ret = get_user(len, &usyscall_mask->len); | |
1219 | if (ret) | |
1220 | return ret; | |
1221 | sc_tables_len = get_sc_tables_len(); | |
1222 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1223 | if (len < sc_tables_len) { | |
1224 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1225 | } | |
1226 | /* Array is large enough, we can copy array to user-space. */ | |
1227 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1228 | if (!tmp_mask) | |
1229 | return -ENOMEM; | |
1230 | filter = channel->sc_filter; | |
1231 | ||
1232 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
2f25059d MD |
1233 | bool state; |
1234 | ||
1235 | if (channel->sc_table) { | |
1236 | if (filter) | |
1237 | state = test_bit(bit, filter->sc); | |
1238 | else | |
1239 | state = 1; | |
1240 | } else { | |
1241 | state = 0; | |
1242 | } | |
1243 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1244 | } |
1245 | for (; bit < sc_tables_len; bit++) { | |
2f25059d MD |
1246 | bool state; |
1247 | ||
1248 | if (channel->compat_sc_table) { | |
1249 | if (filter) | |
1250 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1251 | filter->sc_compat); | |
1252 | else | |
1253 | state = 1; | |
1254 | } else { | |
1255 | state = 0; | |
1256 | } | |
1257 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1258 | } |
1259 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1260 | ret = -EFAULT; | |
1261 | kfree(tmp_mask); | |
1262 | return ret; | |
1263 | } |