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> |
259b6cb3 MD |
31 | #include <asm/ptrace.h> |
32 | #include <asm/syscall.h> | |
33 | ||
12e579db | 34 | #include "lib/bitfield.h" |
3a523f5b | 35 | #include "wrapper/tracepoint.h" |
a90917c3 | 36 | #include "lttng-events.h" |
259b6cb3 | 37 | |
6333ace3 | 38 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
39 | # ifndef is_compat_task |
40 | # define is_compat_task() (0) | |
41 | # endif | |
6333ace3 MD |
42 | #endif |
43 | ||
5b7ac358 MD |
44 | enum sc_type { |
45 | SC_TYPE_ENTRY, | |
46 | SC_TYPE_EXIT, | |
47 | SC_TYPE_COMPAT_ENTRY, | |
48 | SC_TYPE_COMPAT_EXIT, | |
49 | }; | |
50 | ||
51 | #define SYSCALL_ENTRY_STR "syscall_entry_" | |
52 | #define COMPAT_SYSCALL_ENTRY_STR "compat_syscall_entry_" | |
53 | #define SYSCALL_EXIT_STR "syscall_exit_" | |
54 | #define COMPAT_SYSCALL_EXIT_STR "compat_syscall_exit_" | |
55 | ||
a93244f8 | 56 | static |
2faf7d1b | 57 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
58 | static |
59 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 60 | |
3a523f5b MD |
61 | /* |
62 | * Forward declarations for old kernels. | |
63 | */ | |
64 | struct mmsghdr; | |
65 | struct rlimit64; | |
66 | struct oldold_utsname; | |
67 | struct old_utsname; | |
68 | struct sel_arg_struct; | |
69 | struct mmap_arg_struct; | |
70 | ||
80f87dd2 MD |
71 | #ifdef IA32_NR_syscalls |
72 | #define NR_compat_syscalls IA32_NR_syscalls | |
73 | #else | |
74 | #define NR_compat_syscalls NR_syscalls | |
75 | #endif | |
76 | ||
259b6cb3 MD |
77 | /* |
78 | * Create LTTng tracepoint probes. | |
79 | */ | |
80 | #define LTTNG_PACKAGE_BUILD | |
81 | #define CREATE_TRACE_POINTS | |
2655f9ad | 82 | #define TP_MODULE_NOINIT |
2f804c0a | 83 | #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers |
259b6cb3 | 84 | |
a93244f8 MD |
85 | #define PARAMS(args...) args |
86 | ||
5b7ac358 MD |
87 | /* Handle unknown syscalls */ |
88 | #define TRACE_SYSTEM syscalls_unknown | |
89 | #include "instrumentation/syscalls/headers/syscalls_unknown.h" | |
90 | #undef TRACE_SYSTEM | |
91 | ||
fc4f7161 MD |
92 | #define SC_ENTER |
93 | ||
fc4f7161 MD |
94 | #undef sc_exit |
95 | #define sc_exit(...) | |
b75d00c4 MD |
96 | #undef sc_in |
97 | #define sc_in(...) __VA_ARGS__ | |
98 | #undef sc_out | |
99 | #define sc_out(...) | |
100 | #undef sc_inout | |
101 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
102 | |
103 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 104 | #undef TP_PROBE_CB |
259b6cb3 | 105 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 106 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 107 | LTTNG_TRACEPOINT_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
a93244f8 | 108 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c MD |
109 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
110 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ | |
111 | PARAMS(_locvar), PARAMS(_code), \ | |
7ca580f8 | 112 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 113 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 114 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_enter_##_name, PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 115 | PARAMS(_printk)) |
cb3ef14c | 116 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 117 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_enter_##_template, syscall_enter_##_name) |
a93244f8 | 118 | #undef TRACE_SYSTEM |
5b7ac358 MD |
119 | #define TRACE_SYSTEM syscall_enter_integers |
120 | #define TRACE_INCLUDE_FILE syscalls_integers | |
177b3692 | 121 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
5b7ac358 | 122 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 123 | #undef TRACE_SYSTEM |
5b7ac358 MD |
124 | #define TRACE_SYSTEM syscall_enter_pointers |
125 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
177b3692 | 126 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" |
5b7ac358 | 127 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 128 | #undef TRACE_SYSTEM |
cb3ef14c MD |
129 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
130 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
131 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
132 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 133 | #undef TP_PROBE_CB |
3bc29f0a MD |
134 | #undef _TRACE_SYSCALLS_INTEGERS_H |
135 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
136 | |
137 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 138 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
cb3ef14c | 139 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 140 | LTTNG_TRACEPOINT_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 141 | PARAMS(_struct), PARAMS(_assign), \ |
a93244f8 | 142 | PARAMS(_printk)) |
cb3ef14c | 143 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 144 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 145 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 146 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 147 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 148 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_enter_##_name, PARAMS(_struct), \ |
5b7ac358 | 149 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 150 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 151 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_enter_##_template, \ |
5b7ac358 MD |
152 | compat_syscall_enter_##_name) |
153 | #define TRACE_SYSTEM compat_syscall_enter_integers | |
154 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
155 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
156 | #undef TRACE_INCLUDE_FILE | |
157 | #undef TRACE_SYSTEM | |
158 | #define TRACE_SYSTEM compat_syscall_enter_pointers | |
159 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
160 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
161 | #undef TRACE_INCLUDE_FILE | |
162 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
163 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
164 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
165 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
166 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 167 | #undef TP_PROBE_CB |
3bc29f0a MD |
168 | #undef _TRACE_SYSCALLS_INTEGERS_H |
169 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 170 | |
fc4f7161 MD |
171 | #undef SC_ENTER |
172 | ||
173 | #define SC_EXIT | |
174 | ||
fc4f7161 MD |
175 | #undef sc_exit |
176 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
177 | #undef sc_in |
178 | #define sc_in(...) | |
179 | #undef sc_out | |
180 | #define sc_out(...) __VA_ARGS__ | |
181 | #undef sc_inout | |
182 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
183 | |
184 | /* Hijack probe callback for system call exit */ | |
185 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 186 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 187 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 188 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 189 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 190 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 191 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 192 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 193 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 194 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \ |
5b7ac358 | 195 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c MD |
196 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
197 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 MD |
198 | syscall_exit_##_name) |
199 | #define TRACE_SYSTEM syscall_exit_integers | |
200 | #define TRACE_INCLUDE_FILE syscalls_integers | |
201 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
202 | #undef TRACE_INCLUDE_FILE | |
203 | #undef TRACE_SYSTEM | |
204 | #define TRACE_SYSTEM syscall_exit_pointers | |
205 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
206 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
207 | #undef TRACE_INCLUDE_FILE | |
208 | #undef TRACE_SYSTEM | |
cb3ef14c MD |
209 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
210 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
211 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
212 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 213 | #undef TP_PROBE_CB |
3bc29f0a MD |
214 | #undef _TRACE_SYSCALLS_INTEGERS_H |
215 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
216 | |
217 | ||
218 | /* Hijack probe callback for compat system call exit */ | |
219 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
cb3ef14c | 220 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \ |
3bc29f0a | 221 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
5b7ac358 | 222 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 223 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \ |
3bc29f0a | 224 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
cb3ef14c | 225 | PARAMS(_locvar), PARAMS(_code), \ |
7ca580f8 | 226 | PARAMS(_struct), PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 227 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \ |
3bc29f0a | 228 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \ |
a93244f8 | 229 | PARAMS(_assign), PARAMS(_printk)) |
cb3ef14c | 230 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 231 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 MD |
232 | compat_syscall_exit_##_name) |
233 | #define TRACE_SYSTEM compat_syscall_exit_integers | |
234 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
a93244f8 | 235 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" |
5b7ac358 | 236 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 237 | #undef TRACE_SYSTEM |
5b7ac358 MD |
238 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
239 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
a93244f8 | 240 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" |
5b7ac358 | 241 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 242 | #undef TRACE_SYSTEM |
cb3ef14c MD |
243 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
244 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
245 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
246 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 247 | #undef TP_PROBE_CB |
3bc29f0a MD |
248 | #undef _TRACE_SYSCALLS_INTEGERS_H |
249 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 | 250 | |
fc4f7161 | 251 | #undef SC_EXIT |
259b6cb3 | 252 | |
2655f9ad | 253 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
254 | #undef LTTNG_PACKAGE_BUILD |
255 | #undef CREATE_TRACE_POINTS | |
256 | ||
a93244f8 MD |
257 | struct trace_syscall_entry { |
258 | void *func; | |
259 | const struct lttng_event_desc *desc; | |
260 | const struct lttng_event_field *fields; | |
261 | unsigned int nrargs; | |
262 | }; | |
263 | ||
264 | #define CREATE_SYSCALL_TABLE | |
265 | ||
fc4f7161 MD |
266 | #define SC_ENTER |
267 | ||
268 | #undef sc_exit | |
269 | #define sc_exit(...) | |
270 | ||
259b6cb3 | 271 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 272 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 273 | [ _nr ] = { \ |
5b7ac358 | 274 | .func = __event_probe__syscall_enter_##_template, \ |
259b6cb3 | 275 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
276 | .fields = __event_fields___syscall_enter_##_template, \ |
277 | .desc = &__event_desc___syscall_enter_##_name, \ | |
259b6cb3 MD |
278 | }, |
279 | ||
5b7ac358 | 280 | /* Syscall enter tracing table */ |
49c50022 | 281 | static const struct trace_syscall_entry sc_table[] = { |
177b3692 MD |
282 | #include "instrumentation/syscalls/headers/syscalls_integers.h" |
283 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
259b6cb3 MD |
284 | }; |
285 | ||
a93244f8 MD |
286 | #undef TRACE_SYSCALL_TABLE |
287 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
288 | [ _nr ] = { \ | |
5b7ac358 | 289 | .func = __event_probe__compat_syscall_enter_##_template, \ |
a93244f8 | 290 | .nrargs = (_nrargs), \ |
5b7ac358 MD |
291 | .fields = __event_fields___compat_syscall_enter_##_template, \ |
292 | .desc = &__event_desc___compat_syscall_enter_##_name, \ | |
a93244f8 MD |
293 | }, |
294 | ||
5b7ac358 | 295 | /* Compat syscall enter table */ |
a93244f8 MD |
296 | const struct trace_syscall_entry compat_sc_table[] = { |
297 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
298 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
299 | }; | |
259b6cb3 | 300 | |
fc4f7161 MD |
301 | #undef SC_ENTER |
302 | ||
303 | #define SC_EXIT | |
304 | ||
305 | #undef sc_exit | |
306 | #define sc_exit(...) __VA_ARGS__ | |
307 | ||
5b7ac358 MD |
308 | #undef TRACE_SYSCALL_TABLE |
309 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
310 | [ _nr ] = { \ | |
311 | .func = __event_probe__syscall_exit_##_template, \ | |
312 | .nrargs = (_nrargs), \ | |
313 | .fields = __event_fields___syscall_exit_##_template, \ | |
314 | .desc = &__event_desc___syscall_exit_##_name, \ | |
315 | }, | |
316 | ||
317 | /* Syscall exit table */ | |
318 | static const struct trace_syscall_entry sc_exit_table[] = { | |
319 | #include "instrumentation/syscalls/headers/syscalls_integers.h" | |
320 | #include "instrumentation/syscalls/headers/syscalls_pointers.h" | |
321 | }; | |
322 | ||
323 | #undef TRACE_SYSCALL_TABLE | |
324 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
325 | [ _nr ] = { \ | |
326 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
327 | .nrargs = (_nrargs), \ | |
328 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
329 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
330 | }, | |
331 | ||
332 | /* Compat syscall exit table */ | |
333 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
334 | #include "instrumentation/syscalls/headers/compat_syscalls_integers.h" | |
335 | #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h" | |
336 | }; | |
337 | ||
fc4f7161 MD |
338 | #undef SC_EXIT |
339 | ||
a93244f8 | 340 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 341 | |
80f87dd2 MD |
342 | struct lttng_syscall_filter { |
343 | DECLARE_BITMAP(sc, NR_syscalls); | |
344 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
345 | }; | |
346 | ||
a90917c3 | 347 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
348 | struct pt_regs *regs, unsigned int id) |
349 | { | |
350 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 351 | |
f405cfce | 352 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
a93244f8 | 353 | if (unlikely(is_compat_task())) |
5b7ac358 | 354 | __event_probe__compat_syscall_enter_unknown(event, id, args); |
a93244f8 | 355 | else |
5b7ac358 | 356 | __event_probe__syscall_enter_unknown(event, id, args); |
f405cfce MD |
357 | } |
358 | ||
2faf7d1b | 359 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 360 | { |
a90917c3 MD |
361 | struct lttng_channel *chan = __data; |
362 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
363 | const struct trace_syscall_entry *table, *entry; |
364 | size_t table_len; | |
259b6cb3 | 365 | |
b76dc1a0 | 366 | if (unlikely(is_compat_task())) { |
80f87dd2 MD |
367 | struct lttng_syscall_filter *filter; |
368 | ||
369 | filter = rcu_dereference(chan->sc_filter); | |
370 | if (filter) { | |
371 | if (id >= NR_compat_syscalls | |
372 | || !test_bit(id, filter->sc_compat)) { | |
373 | /* System call filtered out. */ | |
374 | return; | |
375 | } | |
376 | } | |
49c50022 | 377 | table = compat_sc_table; |
a93244f8 | 378 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
379 | unknown_event = chan->sc_compat_unknown; |
380 | } else { | |
80f87dd2 MD |
381 | struct lttng_syscall_filter *filter; |
382 | ||
383 | filter = rcu_dereference(chan->sc_filter); | |
384 | if (filter) { | |
385 | if (id >= NR_syscalls | |
386 | || !test_bit(id, filter->sc)) { | |
387 | /* System call filtered out. */ | |
388 | return; | |
389 | } | |
390 | } | |
49c50022 MD |
391 | table = sc_table; |
392 | table_len = ARRAY_SIZE(sc_table); | |
393 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 394 | } |
49c50022 MD |
395 | if (unlikely(id >= table_len)) { |
396 | syscall_entry_unknown(unknown_event, regs, id); | |
259b6cb3 | 397 | return; |
f405cfce | 398 | } |
49c50022 MD |
399 | if (unlikely(is_compat_task())) |
400 | event = chan->compat_sc_table[id]; | |
401 | else | |
402 | event = chan->sc_table[id]; | |
f405cfce | 403 | if (unlikely(!event)) { |
49c50022 | 404 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
405 | return; |
406 | } | |
49c50022 | 407 | entry = &table[id]; |
f405cfce | 408 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
409 | |
410 | switch (entry->nrargs) { | |
411 | case 0: | |
412 | { | |
413 | void (*fptr)(void *__data) = entry->func; | |
414 | ||
415 | fptr(event); | |
416 | break; | |
417 | } | |
418 | case 1: | |
419 | { | |
420 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
421 | unsigned long args[1]; | |
422 | ||
423 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
424 | fptr(event, args[0]); | |
425 | break; | |
426 | } | |
427 | case 2: | |
428 | { | |
429 | void (*fptr)(void *__data, | |
430 | unsigned long arg0, | |
431 | unsigned long arg1) = entry->func; | |
432 | unsigned long args[2]; | |
433 | ||
434 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
435 | fptr(event, args[0], args[1]); | |
436 | break; | |
437 | } | |
438 | case 3: | |
439 | { | |
440 | void (*fptr)(void *__data, | |
441 | unsigned long arg0, | |
442 | unsigned long arg1, | |
443 | unsigned long arg2) = entry->func; | |
444 | unsigned long args[3]; | |
445 | ||
446 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
447 | fptr(event, args[0], args[1], args[2]); | |
448 | break; | |
449 | } | |
450 | case 4: | |
451 | { | |
452 | void (*fptr)(void *__data, | |
453 | unsigned long arg0, | |
454 | unsigned long arg1, | |
455 | unsigned long arg2, | |
456 | unsigned long arg3) = entry->func; | |
457 | unsigned long args[4]; | |
458 | ||
459 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
460 | fptr(event, args[0], args[1], args[2], args[3]); | |
461 | break; | |
462 | } | |
463 | case 5: | |
464 | { | |
465 | void (*fptr)(void *__data, | |
466 | unsigned long arg0, | |
467 | unsigned long arg1, | |
468 | unsigned long arg2, | |
469 | unsigned long arg3, | |
470 | unsigned long arg4) = entry->func; | |
471 | unsigned long args[5]; | |
472 | ||
473 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
474 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
475 | break; | |
476 | } | |
477 | case 6: | |
478 | { | |
479 | void (*fptr)(void *__data, | |
480 | unsigned long arg0, | |
481 | unsigned long arg1, | |
482 | unsigned long arg2, | |
483 | unsigned long arg3, | |
484 | unsigned long arg4, | |
485 | unsigned long arg5) = entry->func; | |
486 | unsigned long args[6]; | |
487 | ||
488 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
489 | fptr(event, args[0], args[1], args[2], | |
490 | args[3], args[4], args[5]); | |
491 | break; | |
492 | } | |
493 | default: | |
494 | break; | |
495 | } | |
496 | } | |
497 | ||
5b7ac358 MD |
498 | static void syscall_exit_unknown(struct lttng_event *event, |
499 | struct pt_regs *regs, unsigned int id, long ret) | |
500 | { | |
501 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
502 | ||
503 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
504 | if (unlikely(is_compat_task())) | |
505 | __event_probe__compat_syscall_exit_unknown(event, id, ret, | |
506 | args); | |
507 | else | |
508 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
509 | } | |
510 | ||
511 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
512 | { | |
513 | struct lttng_channel *chan = __data; | |
514 | struct lttng_event *event, *unknown_event; | |
515 | const struct trace_syscall_entry *table, *entry; | |
516 | size_t table_len; | |
517 | long id; | |
518 | ||
519 | id = syscall_get_nr(current, regs); | |
520 | if (unlikely(is_compat_task())) { | |
521 | struct lttng_syscall_filter *filter; | |
522 | ||
523 | filter = rcu_dereference(chan->sc_filter); | |
524 | if (filter) { | |
525 | if (id >= NR_compat_syscalls | |
526 | || !test_bit(id, filter->sc_compat)) { | |
527 | /* System call filtered out. */ | |
528 | return; | |
529 | } | |
530 | } | |
531 | table = compat_sc_exit_table; | |
532 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
533 | unknown_event = chan->compat_sc_exit_unknown; | |
534 | } else { | |
535 | struct lttng_syscall_filter *filter; | |
536 | ||
537 | filter = rcu_dereference(chan->sc_filter); | |
538 | if (filter) { | |
539 | if (id >= NR_syscalls | |
540 | || !test_bit(id, filter->sc)) { | |
541 | /* System call filtered out. */ | |
542 | return; | |
543 | } | |
544 | } | |
545 | table = sc_exit_table; | |
546 | table_len = ARRAY_SIZE(sc_exit_table); | |
547 | unknown_event = chan->sc_exit_unknown; | |
548 | } | |
549 | if (unlikely(id >= table_len)) { | |
550 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
551 | return; | |
552 | } | |
553 | if (unlikely(is_compat_task())) | |
554 | event = chan->compat_sc_exit_table[id]; | |
555 | else | |
556 | event = chan->sc_exit_table[id]; | |
557 | if (unlikely(!event)) { | |
558 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
559 | return; | |
560 | } | |
561 | entry = &table[id]; | |
562 | WARN_ON_ONCE(!entry); | |
563 | ||
564 | switch (entry->nrargs) { | |
565 | case 0: | |
566 | { | |
fc4f7161 | 567 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 568 | |
fc4f7161 | 569 | fptr(event, ret); |
5b7ac358 MD |
570 | break; |
571 | } | |
572 | case 1: | |
573 | { | |
574 | void (*fptr)(void *__data, | |
fc4f7161 | 575 | long ret, |
5b7ac358 MD |
576 | unsigned long arg0) = entry->func; |
577 | unsigned long args[1]; | |
578 | ||
579 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 580 | fptr(event, ret, args[0]); |
5b7ac358 MD |
581 | break; |
582 | } | |
583 | case 2: | |
584 | { | |
585 | void (*fptr)(void *__data, | |
fc4f7161 | 586 | long ret, |
5b7ac358 MD |
587 | unsigned long arg0, |
588 | unsigned long arg1) = entry->func; | |
589 | unsigned long args[2]; | |
590 | ||
591 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 592 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
593 | break; |
594 | } | |
595 | case 3: | |
596 | { | |
597 | void (*fptr)(void *__data, | |
fc4f7161 | 598 | long ret, |
5b7ac358 MD |
599 | unsigned long arg0, |
600 | unsigned long arg1, | |
601 | unsigned long arg2) = entry->func; | |
602 | unsigned long args[3]; | |
603 | ||
604 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 605 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
606 | break; |
607 | } | |
608 | case 4: | |
609 | { | |
610 | void (*fptr)(void *__data, | |
fc4f7161 | 611 | long ret, |
5b7ac358 MD |
612 | unsigned long arg0, |
613 | unsigned long arg1, | |
614 | unsigned long arg2, | |
615 | unsigned long arg3) = entry->func; | |
616 | unsigned long args[4]; | |
617 | ||
618 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 619 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
620 | break; |
621 | } | |
622 | case 5: | |
623 | { | |
624 | void (*fptr)(void *__data, | |
fc4f7161 | 625 | long ret, |
5b7ac358 MD |
626 | unsigned long arg0, |
627 | unsigned long arg1, | |
628 | unsigned long arg2, | |
629 | unsigned long arg3, | |
630 | unsigned long arg4) = entry->func; | |
631 | unsigned long args[5]; | |
632 | ||
633 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 634 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
635 | break; |
636 | } | |
637 | case 6: | |
638 | { | |
639 | void (*fptr)(void *__data, | |
fc4f7161 | 640 | long ret, |
5b7ac358 MD |
641 | unsigned long arg0, |
642 | unsigned long arg1, | |
643 | unsigned long arg2, | |
644 | unsigned long arg3, | |
645 | unsigned long arg4, | |
646 | unsigned long arg5) = entry->func; | |
647 | unsigned long args[6]; | |
648 | ||
649 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 650 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
651 | args[3], args[4], args[5]); |
652 | break; | |
653 | } | |
654 | default: | |
655 | break; | |
656 | } | |
657 | } | |
658 | ||
2a0c4816 | 659 | /* noinline to diminish caller stack size */ |
49c50022 MD |
660 | static |
661 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
662 | struct lttng_event **chan_table, struct lttng_channel *chan, |
663 | void *filter, enum sc_type type) | |
259b6cb3 | 664 | { |
2a0c4816 | 665 | const struct lttng_event_desc *desc; |
259b6cb3 | 666 | unsigned int i; |
49c50022 MD |
667 | |
668 | /* Allocate events for each syscall, insert into table */ | |
669 | for (i = 0; i < table_len; i++) { | |
670 | struct lttng_kernel_event ev; | |
2a0c4816 | 671 | desc = table[i].desc; |
49c50022 MD |
672 | |
673 | if (!desc) { | |
674 | /* Unknown syscall */ | |
675 | continue; | |
676 | } | |
677 | /* | |
678 | * Skip those already populated by previous failed | |
679 | * register for this channel. | |
680 | */ | |
681 | if (chan_table[i]) | |
682 | continue; | |
683 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
684 | switch (type) { |
685 | case SC_TYPE_ENTRY: | |
686 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
687 | LTTNG_KERNEL_SYM_NAME_LEN); | |
688 | break; | |
689 | case SC_TYPE_EXIT: | |
690 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
691 | LTTNG_KERNEL_SYM_NAME_LEN); | |
692 | break; | |
693 | case SC_TYPE_COMPAT_ENTRY: | |
694 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
695 | LTTNG_KERNEL_SYM_NAME_LEN); | |
696 | break; | |
697 | case SC_TYPE_COMPAT_EXIT: | |
698 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
699 | LTTNG_KERNEL_SYM_NAME_LEN); | |
700 | break; | |
701 | default: | |
702 | BUG_ON(1); | |
703 | break; | |
704 | } | |
705 | strncat(ev.name, desc->name, | |
706 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 707 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
49c50022 | 708 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 709 | chan_table[i] = lttng_event_create(chan, &ev, filter, |
49c50022 | 710 | desc); |
abc0446a MD |
711 | WARN_ON_ONCE(!chan_table[i]); |
712 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
713 | /* |
714 | * If something goes wrong in event registration | |
715 | * after the first one, we have no choice but to | |
716 | * leave the previous events in there, until | |
717 | * deleted by session teardown. | |
718 | */ | |
abc0446a | 719 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
720 | } |
721 | } | |
722 | return 0; | |
723 | } | |
724 | ||
a90917c3 | 725 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 726 | { |
2a0c4816 | 727 | struct lttng_kernel_event ev; |
259b6cb3 MD |
728 | int ret; |
729 | ||
730 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
731 | |
732 | if (!chan->sc_table) { | |
733 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 734 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
735 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
736 | if (!chan->sc_table) | |
737 | return -ENOMEM; | |
738 | } | |
5b7ac358 MD |
739 | if (!chan->sc_exit_table) { |
740 | /* create syscall table mapping syscall to events */ | |
741 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
742 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
743 | if (!chan->sc_exit_table) | |
744 | return -ENOMEM; | |
745 | } | |
746 | ||
259b6cb3 | 747 | |
49c50022 MD |
748 | #ifdef CONFIG_COMPAT |
749 | if (!chan->compat_sc_table) { | |
750 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 751 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 752 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
753 | if (!chan->compat_sc_table) |
754 | return -ENOMEM; | |
755 | } | |
5b7ac358 MD |
756 | |
757 | if (!chan->compat_sc_exit_table) { | |
758 | /* create syscall table mapping compat syscall to events */ | |
759 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
760 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
761 | if (!chan->compat_sc_exit_table) | |
762 | return -ENOMEM; | |
763 | } | |
49c50022 | 764 | #endif |
f405cfce | 765 | if (!chan->sc_unknown) { |
f405cfce | 766 | const struct lttng_event_desc *desc = |
5b7ac358 | 767 | &__event_desc___syscall_enter_unknown; |
2f804c0a | 768 | |
f405cfce | 769 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
770 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
771 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
f405cfce | 772 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 773 | chan->sc_unknown = lttng_event_create(chan, &ev, filter, |
f405cfce | 774 | desc); |
abc0446a MD |
775 | WARN_ON_ONCE(!chan->sc_unknown); |
776 | if (IS_ERR(chan->sc_unknown)) { | |
777 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
778 | } |
779 | } | |
780 | ||
b76dc1a0 | 781 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 782 | const struct lttng_event_desc *desc = |
5b7ac358 | 783 | &__event_desc___compat_syscall_enter_unknown; |
b76dc1a0 MD |
784 | |
785 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
786 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
787 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
b76dc1a0 | 788 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
a90917c3 | 789 | chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter, |
b76dc1a0 | 790 | desc); |
abc0446a MD |
791 | WARN_ON_ONCE(!chan->sc_unknown); |
792 | if (IS_ERR(chan->sc_compat_unknown)) { | |
793 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
794 | } |
795 | } | |
796 | ||
5b7ac358 | 797 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 798 | const struct lttng_event_desc *desc = |
5b7ac358 | 799 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
800 | |
801 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
802 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
803 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
2f804c0a | 804 | ev.instrumentation = LTTNG_KERNEL_NOOP; |
5b7ac358 MD |
805 | chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev, |
806 | filter, desc); | |
807 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); | |
808 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
809 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
810 | } | |
811 | } | |
812 | ||
813 | if (!chan->sc_exit_unknown) { | |
814 | const struct lttng_event_desc *desc = | |
815 | &__event_desc___syscall_exit_unknown; | |
816 | ||
817 | memset(&ev, 0, sizeof(ev)); | |
818 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
819 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
820 | ev.instrumentation = LTTNG_KERNEL_NOOP; | |
821 | chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter, | |
2f804c0a | 822 | desc); |
5b7ac358 MD |
823 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
824 | if (IS_ERR(chan->sc_exit_unknown)) { | |
825 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
826 | } |
827 | } | |
828 | ||
49c50022 | 829 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
830 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
831 | if (ret) | |
832 | return ret; | |
833 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
834 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
835 | if (ret) |
836 | return ret; | |
5b7ac358 | 837 | |
49c50022 | 838 | #ifdef CONFIG_COMPAT |
a93244f8 | 839 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
840 | chan->compat_sc_table, chan, filter, |
841 | SC_TYPE_COMPAT_ENTRY); | |
842 | if (ret) | |
843 | return ret; | |
844 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
845 | chan->compat_sc_exit_table, chan, filter, | |
846 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
847 | if (ret) |
848 | return ret; | |
849 | #endif | |
80f87dd2 MD |
850 | if (!chan->sys_enter_registered) { |
851 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
852 | (void *) syscall_entry_probe, chan); | |
853 | if (ret) | |
854 | return ret; | |
855 | chan->sys_enter_registered = 1; | |
856 | } | |
63728b02 MD |
857 | /* |
858 | * We change the name of sys_exit tracepoint due to namespace | |
859 | * conflict with sys_exit syscall entry. | |
860 | */ | |
80f87dd2 MD |
861 | if (!chan->sys_exit_registered) { |
862 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 863 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
864 | if (ret) { |
865 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
866 | (void *) syscall_entry_probe, chan)); | |
867 | return ret; | |
868 | } | |
869 | chan->sys_exit_registered = 1; | |
63728b02 | 870 | } |
259b6cb3 MD |
871 | return ret; |
872 | } | |
873 | ||
874 | /* | |
875 | * Only called at session destruction. | |
876 | */ | |
a90917c3 | 877 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
878 | { |
879 | int ret; | |
880 | ||
881 | if (!chan->sc_table) | |
882 | return 0; | |
80f87dd2 MD |
883 | if (chan->sys_enter_registered) { |
884 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 885 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
886 | if (ret) |
887 | return ret; | |
888 | chan->sys_enter_registered = 0; | |
889 | } | |
890 | if (chan->sys_exit_registered) { | |
891 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
892 | (void *) syscall_entry_probe, chan); | |
893 | if (ret) | |
894 | return ret; | |
895 | chan->sys_exit_registered = 0; | |
896 | } | |
a90917c3 | 897 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 898 | kfree(chan->sc_table); |
5b7ac358 | 899 | kfree(chan->sc_exit_table); |
49c50022 MD |
900 | #ifdef CONFIG_COMPAT |
901 | kfree(chan->compat_sc_table); | |
5b7ac358 | 902 | kfree(chan->compat_sc_exit_table); |
49c50022 | 903 | #endif |
80f87dd2 MD |
904 | kfree(chan->sc_filter); |
905 | return 0; | |
906 | } | |
907 | ||
908 | static | |
909 | int get_syscall_nr(const char *syscall_name) | |
910 | { | |
911 | int syscall_nr = -1; | |
912 | int i; | |
913 | ||
914 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
915 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 916 | const char *it_name; |
80f87dd2 MD |
917 | |
918 | entry = &sc_table[i]; | |
919 | if (!entry->desc) | |
920 | continue; | |
5b7ac358 MD |
921 | it_name = entry->desc->name; |
922 | it_name += strlen(SYSCALL_ENTRY_STR); | |
923 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
924 | syscall_nr = i; |
925 | break; | |
926 | } | |
927 | } | |
928 | return syscall_nr; | |
929 | } | |
930 | ||
931 | static | |
932 | int get_compat_syscall_nr(const char *syscall_name) | |
933 | { | |
934 | int syscall_nr = -1; | |
935 | int i; | |
936 | ||
937 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
938 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 939 | const char *it_name; |
80f87dd2 MD |
940 | |
941 | entry = &compat_sc_table[i]; | |
942 | if (!entry->desc) | |
943 | continue; | |
5b7ac358 MD |
944 | it_name = entry->desc->name; |
945 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
946 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
947 | syscall_nr = i; |
948 | break; | |
949 | } | |
950 | } | |
951 | return syscall_nr; | |
952 | } | |
953 | ||
12e579db MD |
954 | static |
955 | uint32_t get_sc_tables_len(void) | |
956 | { | |
957 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
958 | } | |
959 | ||
80f87dd2 MD |
960 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
961 | const char *name) | |
962 | { | |
963 | int syscall_nr, compat_syscall_nr, ret; | |
964 | struct lttng_syscall_filter *filter; | |
965 | ||
966 | WARN_ON_ONCE(!chan->sc_table); | |
967 | ||
968 | if (!name) { | |
969 | /* Enable all system calls by removing filter */ | |
970 | if (chan->sc_filter) { | |
971 | filter = chan->sc_filter; | |
972 | rcu_assign_pointer(chan->sc_filter, NULL); | |
973 | synchronize_trace(); | |
974 | kfree(filter); | |
975 | } | |
976 | chan->syscall_all = 1; | |
977 | return 0; | |
978 | } | |
979 | ||
980 | if (!chan->sc_filter) { | |
981 | if (chan->syscall_all) { | |
982 | /* | |
983 | * All syscalls are already enabled. | |
984 | */ | |
985 | return -EEXIST; | |
986 | } | |
987 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
988 | GFP_KERNEL); | |
989 | if (!filter) | |
990 | return -ENOMEM; | |
991 | } else { | |
992 | filter = chan->sc_filter; | |
993 | } | |
994 | syscall_nr = get_syscall_nr(name); | |
995 | compat_syscall_nr = get_compat_syscall_nr(name); | |
996 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
997 | ret = -ENOENT; | |
998 | goto error; | |
999 | } | |
1000 | if (syscall_nr >= 0) { | |
1001 | if (test_bit(syscall_nr, filter->sc)) { | |
1002 | ret = -EEXIST; | |
1003 | goto error; | |
1004 | } | |
1005 | bitmap_set(filter->sc, syscall_nr, 1); | |
1006 | } | |
1007 | if (compat_syscall_nr >= 0) { | |
1008 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1009 | ret = -EEXIST; | |
1010 | goto error; | |
1011 | } | |
1012 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1013 | } | |
1014 | if (!chan->sc_filter) | |
1015 | rcu_assign_pointer(chan->sc_filter, filter); | |
1016 | return 0; | |
1017 | ||
1018 | error: | |
1019 | if (!chan->sc_filter) | |
1020 | kfree(filter); | |
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1025 | const char *name) | |
1026 | { | |
1027 | int syscall_nr, compat_syscall_nr, ret; | |
1028 | struct lttng_syscall_filter *filter; | |
1029 | ||
1030 | WARN_ON_ONCE(!chan->sc_table); | |
1031 | ||
1032 | if (!chan->sc_filter) { | |
1033 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1034 | GFP_KERNEL); | |
1035 | if (!filter) | |
1036 | return -ENOMEM; | |
1037 | /* Trace all system calls, then apply disable. */ | |
1038 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1039 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1040 | } else { | |
1041 | filter = chan->sc_filter; | |
1042 | } | |
1043 | ||
72814741 MD |
1044 | if (!name) { |
1045 | /* Disable all system calls */ | |
1046 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1047 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1048 | goto apply_filter; | |
1049 | } | |
80f87dd2 MD |
1050 | syscall_nr = get_syscall_nr(name); |
1051 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1052 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1053 | ret = -ENOENT; | |
1054 | goto error; | |
1055 | } | |
1056 | if (syscall_nr >= 0) { | |
1057 | if (!test_bit(syscall_nr, chan->sc_filter->sc)) { | |
1058 | ret = -EEXIST; | |
1059 | goto error; | |
1060 | } | |
1061 | bitmap_clear(chan->sc_filter->sc, syscall_nr, 1); | |
1062 | } | |
1063 | if (compat_syscall_nr >= 0) { | |
1064 | if (!test_bit(compat_syscall_nr, chan->sc_filter->sc_compat)) { | |
1065 | ret = -EEXIST; | |
1066 | goto error; | |
1067 | } | |
1068 | bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1); | |
1069 | } | |
72814741 | 1070 | apply_filter: |
80f87dd2 MD |
1071 | if (!chan->sc_filter) |
1072 | rcu_assign_pointer(chan->sc_filter, filter); | |
1073 | chan->syscall_all = 0; | |
259b6cb3 | 1074 | return 0; |
80f87dd2 MD |
1075 | |
1076 | error: | |
1077 | if (!chan->sc_filter) | |
1078 | kfree(filter); | |
1079 | return ret; | |
259b6cb3 | 1080 | } |
2d2464bd MD |
1081 | |
1082 | static | |
1083 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1084 | { | |
1085 | const struct trace_syscall_entry *entry; | |
1086 | int iter = 0; | |
1087 | ||
1088 | for (entry = sc_table; | |
1089 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1090 | entry++) { | |
1091 | if (iter++ >= *pos) | |
1092 | return entry; | |
1093 | } | |
1094 | for (entry = compat_sc_table; | |
1095 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1096 | entry++) { | |
1097 | if (iter++ >= *pos) | |
1098 | return entry; | |
1099 | } | |
1100 | /* End of list */ | |
1101 | return NULL; | |
1102 | } | |
1103 | ||
1104 | static | |
1105 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1106 | { | |
1107 | return (void *) syscall_list_get_entry(pos); | |
1108 | } | |
1109 | ||
1110 | static | |
1111 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1112 | { | |
1113 | (*ppos)++; | |
1114 | return (void *) syscall_list_get_entry(ppos); | |
1115 | } | |
1116 | ||
1117 | static | |
1118 | void syscall_list_stop(struct seq_file *m, void *p) | |
1119 | { | |
1120 | } | |
1121 | ||
12e579db MD |
1122 | static |
1123 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1124 | const struct trace_syscall_entry **table, | |
1125 | unsigned int *bitness) | |
1126 | { | |
1127 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1128 | if (bitness) | |
1129 | *bitness = BITS_PER_LONG; | |
1130 | if (table) | |
1131 | *table = sc_table; | |
1132 | return 0; | |
1133 | } | |
1134 | if (!(entry >= compat_sc_table | |
1135 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1136 | return -EINVAL; | |
1137 | } | |
1138 | if (bitness) | |
1139 | *bitness = 32; | |
1140 | if (table) | |
1141 | *table = compat_sc_table; | |
1142 | return 0; | |
1143 | } | |
1144 | ||
2d2464bd MD |
1145 | static |
1146 | int syscall_list_show(struct seq_file *m, void *p) | |
1147 | { | |
1148 | const struct trace_syscall_entry *table, *entry = p; | |
1149 | unsigned int bitness; | |
12e579db | 1150 | int ret; |
2d2464bd | 1151 | |
12e579db MD |
1152 | ret = get_sc_table(entry, &table, &bitness); |
1153 | if (ret) | |
1154 | return ret; | |
1155 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", | |
9f5226f0 | 1156 | entry - table, |
2d2464bd MD |
1157 | entry->desc->name, |
1158 | bitness); | |
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | static | |
1163 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1164 | .start = syscall_list_start, | |
1165 | .next = syscall_list_next, | |
1166 | .stop = syscall_list_stop, | |
1167 | .show = syscall_list_show, | |
1168 | }; | |
1169 | ||
1170 | static | |
1171 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1172 | { | |
1173 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1174 | } | |
1175 | ||
1176 | const struct file_operations lttng_syscall_list_fops = { | |
1177 | .owner = THIS_MODULE, | |
1178 | .open = lttng_syscall_list_open, | |
1179 | .read = seq_read, | |
1180 | .llseek = seq_lseek, | |
1181 | .release = seq_release, | |
1182 | }; | |
12e579db MD |
1183 | |
1184 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1185 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1186 | { | |
1187 | uint32_t len, sc_tables_len, bitmask_len; | |
1188 | int ret = 0, bit; | |
1189 | char *tmp_mask; | |
1190 | struct lttng_syscall_filter *filter; | |
1191 | ||
1192 | ret = get_user(len, &usyscall_mask->len); | |
1193 | if (ret) | |
1194 | return ret; | |
1195 | sc_tables_len = get_sc_tables_len(); | |
1196 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1197 | if (len < sc_tables_len) { | |
1198 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1199 | } | |
1200 | /* Array is large enough, we can copy array to user-space. */ | |
1201 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1202 | if (!tmp_mask) | |
1203 | return -ENOMEM; | |
1204 | filter = channel->sc_filter; | |
1205 | ||
1206 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
1207 | bt_bitfield_write_be(tmp_mask, char, bit, 1, | |
1208 | test_bit(bit, filter->sc)); | |
1209 | } | |
1210 | for (; bit < sc_tables_len; bit++) { | |
1211 | bt_bitfield_write_be(tmp_mask, char, bit, 1, | |
1212 | test_bit(bit - ARRAY_SIZE(sc_table), | |
1213 | filter->sc_compat)); | |
1214 | } | |
1215 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1216 | ret = -EFAULT; | |
1217 | kfree(tmp_mask); | |
1218 | return ret; | |
1219 | } |