Commit | Line | Data |
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9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
2 | * | |
259b6cb3 MD |
3 | * lttng-syscalls.c |
4 | * | |
2faf7d1b | 5 | * LTTng syscall probes. |
259b6cb3 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
259b6cb3 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
6333ace3 | 12 | #include <linux/compat.h> |
abc0446a | 13 | #include <linux/err.h> |
80f87dd2 | 14 | #include <linux/bitmap.h> |
7ca580f8 MD |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
2d2464bd | 17 | #include <linux/seq_file.h> |
d4291869 | 18 | #include <linux/stringify.h> |
082d4946 MD |
19 | #include <linux/file.h> |
20 | #include <linux/anon_inodes.h> | |
259b6cb3 MD |
21 | #include <asm/ptrace.h> |
22 | #include <asm/syscall.h> | |
23 | ||
241ae9a8 MD |
24 | #include <lib/bitfield.h> |
25 | #include <wrapper/tracepoint.h> | |
26 | #include <wrapper/file.h> | |
27 | #include <wrapper/rcu.h> | |
28 | #include <lttng-events.h> | |
259b6cb3 | 29 | |
6333ace3 | 30 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
31 | # ifndef is_compat_task |
32 | # define is_compat_task() (0) | |
33 | # endif | |
6333ace3 MD |
34 | #endif |
35 | ||
1aa3298b MD |
36 | /* in_compat_syscall appears in kernel 4.6. */ |
37 | #ifndef in_compat_syscall | |
38 | #define in_compat_syscall() is_compat_task() | |
39 | #endif | |
40 | ||
5b7ac358 MD |
41 | enum sc_type { |
42 | SC_TYPE_ENTRY, | |
43 | SC_TYPE_EXIT, | |
44 | SC_TYPE_COMPAT_ENTRY, | |
45 | SC_TYPE_COMPAT_EXIT, | |
46 | }; | |
47 | ||
d4291869 MD |
48 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
49 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
50 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
51 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
52 | ||
53 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
54 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
55 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
56 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 57 | |
a93244f8 | 58 | static |
2faf7d1b | 59 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
60 | static |
61 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 62 | |
3a523f5b MD |
63 | /* |
64 | * Forward declarations for old kernels. | |
65 | */ | |
66 | struct mmsghdr; | |
67 | struct rlimit64; | |
68 | struct oldold_utsname; | |
69 | struct old_utsname; | |
70 | struct sel_arg_struct; | |
71 | struct mmap_arg_struct; | |
c0b71117 | 72 | struct file_handle; |
a292e6f1 | 73 | struct user_msghdr; |
3a523f5b | 74 | |
80f87dd2 MD |
75 | #ifdef IA32_NR_syscalls |
76 | #define NR_compat_syscalls IA32_NR_syscalls | |
77 | #else | |
78 | #define NR_compat_syscalls NR_syscalls | |
79 | #endif | |
80 | ||
259b6cb3 MD |
81 | /* |
82 | * Create LTTng tracepoint probes. | |
83 | */ | |
84 | #define LTTNG_PACKAGE_BUILD | |
85 | #define CREATE_TRACE_POINTS | |
2655f9ad | 86 | #define TP_MODULE_NOINIT |
c075712b | 87 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 88 | |
a93244f8 MD |
89 | #define PARAMS(args...) args |
90 | ||
5b7ac358 | 91 | /* Handle unknown syscalls */ |
72a52753 | 92 | #undef TRACE_SYSTEM |
5b7ac358 | 93 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 94 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
95 | #undef TRACE_SYSTEM |
96 | ||
fc4f7161 MD |
97 | #define SC_ENTER |
98 | ||
fc4f7161 MD |
99 | #undef sc_exit |
100 | #define sc_exit(...) | |
b75d00c4 MD |
101 | #undef sc_in |
102 | #define sc_in(...) __VA_ARGS__ | |
103 | #undef sc_out | |
104 | #define sc_out(...) | |
105 | #undef sc_inout | |
106 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
107 | |
108 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 109 | #undef TP_PROBE_CB |
259b6cb3 | 110 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 111 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 112 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 113 | PARAMS(_fields)) |
265822ae | 114 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 115 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
116 | PARAMS(_locvar), PARAMS(_code_pre), \ |
117 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
118 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
119 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 120 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 121 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
122 | /* Enumerations only defined at first inclusion. */ |
123 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
124 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 125 | #undef TRACE_SYSTEM |
d4291869 | 126 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 127 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 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 |
241ae9a8 | 133 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 134 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 135 | #undef TRACE_SYSTEM |
141ddf28 | 136 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
137 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
138 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
139 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
140 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 141 | #undef TP_PROBE_CB |
3bc29f0a MD |
142 | #undef _TRACE_SYSCALLS_INTEGERS_H |
143 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
144 | |
145 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 146 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
771af27e | 147 | #define LTTNG_SC_COMPAT |
57ede728 | 148 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 149 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 150 | PARAMS(_fields)) |
265822ae | 151 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 152 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 153 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
154 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
155 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 156 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
157 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
158 | compat_syscall_entry_##_name) | |
141ddf28 MD |
159 | /* Enumerations only defined at inital inclusion (not here). */ |
160 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 161 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 162 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 163 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
164 | #undef TRACE_INCLUDE_FILE |
165 | #undef TRACE_SYSTEM | |
d4291869 | 166 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 167 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 168 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
169 | #undef TRACE_INCLUDE_FILE |
170 | #undef TRACE_SYSTEM | |
141ddf28 | 171 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
172 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
173 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
174 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
175 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 176 | #undef TP_PROBE_CB |
3bc29f0a MD |
177 | #undef _TRACE_SYSCALLS_INTEGERS_H |
178 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 179 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 180 | |
fc4f7161 MD |
181 | #undef SC_ENTER |
182 | ||
183 | #define SC_EXIT | |
184 | ||
fc4f7161 MD |
185 | #undef sc_exit |
186 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
187 | #undef sc_in |
188 | #define sc_in(...) | |
189 | #undef sc_out | |
190 | #define sc_out(...) __VA_ARGS__ | |
191 | #undef sc_inout | |
192 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
193 | |
194 | /* Hijack probe callback for system call exit */ | |
195 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 196 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 197 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 198 | PARAMS(_fields)) |
265822ae | 199 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 200 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 201 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
202 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
203 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
204 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
205 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 206 | syscall_exit_##_name) |
141ddf28 MD |
207 | /* Enumerations only defined at inital inclusion (not here). */ |
208 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
209 | #define TRACE_SYSTEM syscall_exit_integers |
210 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 211 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
212 | #undef TRACE_INCLUDE_FILE |
213 | #undef TRACE_SYSTEM | |
214 | #define TRACE_SYSTEM syscall_exit_pointers | |
215 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 216 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
217 | #undef TRACE_INCLUDE_FILE |
218 | #undef TRACE_SYSTEM | |
141ddf28 | 219 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
220 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
221 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
222 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
223 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 224 | #undef TP_PROBE_CB |
3bc29f0a MD |
225 | #undef _TRACE_SYSCALLS_INTEGERS_H |
226 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
227 | |
228 | ||
229 | /* Hijack probe callback for compat system call exit */ | |
230 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
771af27e | 231 | #define LTTNG_SC_COMPAT |
57ede728 | 232 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 233 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 234 | PARAMS(_fields)) |
265822ae | 235 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 236 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 237 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
238 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
239 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 240 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 241 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 242 | compat_syscall_exit_##_name) |
141ddf28 MD |
243 | /* Enumerations only defined at inital inclusion (not here). */ |
244 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
245 | #define TRACE_SYSTEM compat_syscall_exit_integers |
246 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 247 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 248 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 249 | #undef TRACE_SYSTEM |
5b7ac358 MD |
250 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
251 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 252 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 253 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 254 | #undef TRACE_SYSTEM |
141ddf28 | 255 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
256 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
257 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
258 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
259 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 260 | #undef TP_PROBE_CB |
3bc29f0a MD |
261 | #undef _TRACE_SYSCALLS_INTEGERS_H |
262 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 263 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 264 | |
fc4f7161 | 265 | #undef SC_EXIT |
259b6cb3 | 266 | |
2655f9ad | 267 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
268 | #undef LTTNG_PACKAGE_BUILD |
269 | #undef CREATE_TRACE_POINTS | |
270 | ||
a93244f8 MD |
271 | struct trace_syscall_entry { |
272 | void *func; | |
273 | const struct lttng_event_desc *desc; | |
274 | const struct lttng_event_field *fields; | |
275 | unsigned int nrargs; | |
276 | }; | |
277 | ||
278 | #define CREATE_SYSCALL_TABLE | |
279 | ||
fc4f7161 MD |
280 | #define SC_ENTER |
281 | ||
282 | #undef sc_exit | |
283 | #define sc_exit(...) | |
284 | ||
259b6cb3 | 285 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 286 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 287 | [ _nr ] = { \ |
d4291869 | 288 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 289 | .nrargs = (_nrargs), \ |
d4291869 MD |
290 | .fields = __event_fields___syscall_entry_##_template, \ |
291 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
292 | }, |
293 | ||
5b7ac358 | 294 | /* Syscall enter tracing table */ |
49c50022 | 295 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
296 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
297 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
298 | }; |
299 | ||
a93244f8 MD |
300 | #undef TRACE_SYSCALL_TABLE |
301 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
302 | [ _nr ] = { \ | |
d4291869 | 303 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 304 | .nrargs = (_nrargs), \ |
d4291869 MD |
305 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
306 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
307 | }, |
308 | ||
5b7ac358 | 309 | /* Compat syscall enter table */ |
a93244f8 | 310 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
311 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
312 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 313 | }; |
259b6cb3 | 314 | |
fc4f7161 MD |
315 | #undef SC_ENTER |
316 | ||
317 | #define SC_EXIT | |
318 | ||
319 | #undef sc_exit | |
320 | #define sc_exit(...) __VA_ARGS__ | |
321 | ||
5b7ac358 MD |
322 | #undef TRACE_SYSCALL_TABLE |
323 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
324 | [ _nr ] = { \ | |
325 | .func = __event_probe__syscall_exit_##_template, \ | |
326 | .nrargs = (_nrargs), \ | |
327 | .fields = __event_fields___syscall_exit_##_template, \ | |
328 | .desc = &__event_desc___syscall_exit_##_name, \ | |
329 | }, | |
330 | ||
331 | /* Syscall exit table */ | |
332 | static const struct trace_syscall_entry sc_exit_table[] = { | |
241ae9a8 MD |
333 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
334 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
335 | }; |
336 | ||
337 | #undef TRACE_SYSCALL_TABLE | |
338 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
339 | [ _nr ] = { \ | |
340 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
341 | .nrargs = (_nrargs), \ | |
342 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
343 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
344 | }, | |
345 | ||
346 | /* Compat syscall exit table */ | |
347 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
241ae9a8 MD |
348 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
349 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
350 | }; |
351 | ||
fc4f7161 MD |
352 | #undef SC_EXIT |
353 | ||
a93244f8 | 354 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 355 | |
80f87dd2 MD |
356 | struct lttng_syscall_filter { |
357 | DECLARE_BITMAP(sc, NR_syscalls); | |
358 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
359 | }; | |
360 | ||
a90917c3 | 361 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
362 | struct pt_regs *regs, unsigned int id) |
363 | { | |
364 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
f405cfce | 365 | |
f405cfce | 366 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); |
1aa3298b | 367 | if (unlikely(in_compat_syscall())) |
d4291869 | 368 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 369 | else |
d4291869 | 370 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
371 | } |
372 | ||
2faf7d1b | 373 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 374 | { |
a90917c3 MD |
375 | struct lttng_channel *chan = __data; |
376 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
377 | const struct trace_syscall_entry *table, *entry; |
378 | size_t table_len; | |
259b6cb3 | 379 | |
1aa3298b | 380 | if (unlikely(in_compat_syscall())) { |
80f87dd2 MD |
381 | struct lttng_syscall_filter *filter; |
382 | ||
49e2f4c4 | 383 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 384 | if (filter) { |
74f7b56a | 385 | if (id < 0 || id >= NR_compat_syscalls |
80f87dd2 MD |
386 | || !test_bit(id, filter->sc_compat)) { |
387 | /* System call filtered out. */ | |
388 | return; | |
389 | } | |
390 | } | |
49c50022 | 391 | table = compat_sc_table; |
a93244f8 | 392 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
393 | unknown_event = chan->sc_compat_unknown; |
394 | } else { | |
80f87dd2 MD |
395 | struct lttng_syscall_filter *filter; |
396 | ||
49e2f4c4 | 397 | filter = lttng_rcu_dereference(chan->sc_filter); |
80f87dd2 | 398 | if (filter) { |
74f7b56a | 399 | if (id < 0 || id >= NR_syscalls |
80f87dd2 MD |
400 | || !test_bit(id, filter->sc)) { |
401 | /* System call filtered out. */ | |
402 | return; | |
403 | } | |
404 | } | |
49c50022 MD |
405 | table = sc_table; |
406 | table_len = ARRAY_SIZE(sc_table); | |
407 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 408 | } |
74f7b56a | 409 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 410 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 411 | return; |
f405cfce | 412 | } |
1aa3298b | 413 | if (unlikely(in_compat_syscall())) |
49c50022 MD |
414 | event = chan->compat_sc_table[id]; |
415 | else | |
416 | event = chan->sc_table[id]; | |
f405cfce | 417 | if (unlikely(!event)) { |
49c50022 | 418 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
419 | return; |
420 | } | |
49c50022 | 421 | entry = &table[id]; |
f405cfce | 422 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
423 | |
424 | switch (entry->nrargs) { | |
425 | case 0: | |
426 | { | |
427 | void (*fptr)(void *__data) = entry->func; | |
428 | ||
429 | fptr(event); | |
430 | break; | |
431 | } | |
432 | case 1: | |
433 | { | |
434 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
435 | unsigned long args[1]; | |
436 | ||
437 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
438 | fptr(event, args[0]); | |
439 | break; | |
440 | } | |
441 | case 2: | |
442 | { | |
443 | void (*fptr)(void *__data, | |
444 | unsigned long arg0, | |
445 | unsigned long arg1) = entry->func; | |
446 | unsigned long args[2]; | |
447 | ||
448 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
449 | fptr(event, args[0], args[1]); | |
450 | break; | |
451 | } | |
452 | case 3: | |
453 | { | |
454 | void (*fptr)(void *__data, | |
455 | unsigned long arg0, | |
456 | unsigned long arg1, | |
457 | unsigned long arg2) = entry->func; | |
458 | unsigned long args[3]; | |
459 | ||
460 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
461 | fptr(event, args[0], args[1], args[2]); | |
462 | break; | |
463 | } | |
464 | case 4: | |
465 | { | |
466 | void (*fptr)(void *__data, | |
467 | unsigned long arg0, | |
468 | unsigned long arg1, | |
469 | unsigned long arg2, | |
470 | unsigned long arg3) = entry->func; | |
471 | unsigned long args[4]; | |
472 | ||
473 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
474 | fptr(event, args[0], args[1], args[2], args[3]); | |
475 | break; | |
476 | } | |
477 | case 5: | |
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) = entry->func; | |
485 | unsigned long args[5]; | |
486 | ||
487 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
488 | fptr(event, args[0], args[1], args[2], args[3], args[4]); | |
489 | break; | |
490 | } | |
491 | case 6: | |
492 | { | |
493 | void (*fptr)(void *__data, | |
494 | unsigned long arg0, | |
495 | unsigned long arg1, | |
496 | unsigned long arg2, | |
497 | unsigned long arg3, | |
498 | unsigned long arg4, | |
499 | unsigned long arg5) = entry->func; | |
500 | unsigned long args[6]; | |
501 | ||
502 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
503 | fptr(event, args[0], args[1], args[2], | |
504 | args[3], args[4], args[5]); | |
505 | break; | |
506 | } | |
507 | default: | |
508 | break; | |
509 | } | |
510 | } | |
511 | ||
5b7ac358 | 512 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 513 | struct pt_regs *regs, int id, long ret) |
5b7ac358 MD |
514 | { |
515 | unsigned long args[UNKNOWN_SYSCALL_NRARGS]; | |
516 | ||
517 | syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args); | |
1aa3298b | 518 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
519 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
520 | args); | |
521 | else | |
522 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
523 | } | |
524 | ||
525 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
526 | { | |
527 | struct lttng_channel *chan = __data; | |
528 | struct lttng_event *event, *unknown_event; | |
529 | const struct trace_syscall_entry *table, *entry; | |
530 | size_t table_len; | |
531 | long id; | |
532 | ||
533 | id = syscall_get_nr(current, regs); | |
1aa3298b | 534 | if (unlikely(in_compat_syscall())) { |
5b7ac358 MD |
535 | struct lttng_syscall_filter *filter; |
536 | ||
49e2f4c4 | 537 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 538 | if (filter) { |
74f7b56a | 539 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
540 | || !test_bit(id, filter->sc_compat)) { |
541 | /* System call filtered out. */ | |
542 | return; | |
543 | } | |
544 | } | |
545 | table = compat_sc_exit_table; | |
546 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
547 | unknown_event = chan->compat_sc_exit_unknown; | |
548 | } else { | |
549 | struct lttng_syscall_filter *filter; | |
550 | ||
49e2f4c4 | 551 | filter = lttng_rcu_dereference(chan->sc_filter); |
5b7ac358 | 552 | if (filter) { |
74f7b56a | 553 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
554 | || !test_bit(id, filter->sc)) { |
555 | /* System call filtered out. */ | |
556 | return; | |
557 | } | |
558 | } | |
559 | table = sc_exit_table; | |
560 | table_len = ARRAY_SIZE(sc_exit_table); | |
561 | unknown_event = chan->sc_exit_unknown; | |
562 | } | |
74f7b56a | 563 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
564 | syscall_exit_unknown(unknown_event, regs, id, ret); |
565 | return; | |
566 | } | |
1aa3298b | 567 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
568 | event = chan->compat_sc_exit_table[id]; |
569 | else | |
570 | event = chan->sc_exit_table[id]; | |
571 | if (unlikely(!event)) { | |
572 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
573 | return; | |
574 | } | |
575 | entry = &table[id]; | |
576 | WARN_ON_ONCE(!entry); | |
577 | ||
578 | switch (entry->nrargs) { | |
579 | case 0: | |
580 | { | |
fc4f7161 | 581 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 582 | |
fc4f7161 | 583 | fptr(event, ret); |
5b7ac358 MD |
584 | break; |
585 | } | |
586 | case 1: | |
587 | { | |
588 | void (*fptr)(void *__data, | |
fc4f7161 | 589 | long ret, |
5b7ac358 MD |
590 | unsigned long arg0) = entry->func; |
591 | unsigned long args[1]; | |
592 | ||
593 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 594 | fptr(event, ret, args[0]); |
5b7ac358 MD |
595 | break; |
596 | } | |
597 | case 2: | |
598 | { | |
599 | void (*fptr)(void *__data, | |
fc4f7161 | 600 | long ret, |
5b7ac358 MD |
601 | unsigned long arg0, |
602 | unsigned long arg1) = entry->func; | |
603 | unsigned long args[2]; | |
604 | ||
605 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 606 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
607 | break; |
608 | } | |
609 | case 3: | |
610 | { | |
611 | void (*fptr)(void *__data, | |
fc4f7161 | 612 | long ret, |
5b7ac358 MD |
613 | unsigned long arg0, |
614 | unsigned long arg1, | |
615 | unsigned long arg2) = entry->func; | |
616 | unsigned long args[3]; | |
617 | ||
618 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 619 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
620 | break; |
621 | } | |
622 | case 4: | |
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) = entry->func; | |
630 | unsigned long args[4]; | |
631 | ||
632 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 633 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
634 | break; |
635 | } | |
636 | case 5: | |
637 | { | |
638 | void (*fptr)(void *__data, | |
fc4f7161 | 639 | long ret, |
5b7ac358 MD |
640 | unsigned long arg0, |
641 | unsigned long arg1, | |
642 | unsigned long arg2, | |
643 | unsigned long arg3, | |
644 | unsigned long arg4) = entry->func; | |
645 | unsigned long args[5]; | |
646 | ||
647 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 648 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
649 | break; |
650 | } | |
651 | case 6: | |
652 | { | |
653 | void (*fptr)(void *__data, | |
fc4f7161 | 654 | long ret, |
5b7ac358 MD |
655 | unsigned long arg0, |
656 | unsigned long arg1, | |
657 | unsigned long arg2, | |
658 | unsigned long arg3, | |
659 | unsigned long arg4, | |
660 | unsigned long arg5) = entry->func; | |
661 | unsigned long args[6]; | |
662 | ||
663 | syscall_get_arguments(current, regs, 0, entry->nrargs, args); | |
fc4f7161 | 664 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
665 | args[3], args[4], args[5]); |
666 | break; | |
667 | } | |
668 | default: | |
669 | break; | |
670 | } | |
671 | } | |
672 | ||
33a39a3c MD |
673 | /* |
674 | * noinline to diminish caller stack size. | |
675 | * Should be called with sessions lock held. | |
676 | */ | |
49c50022 MD |
677 | static |
678 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
679 | struct lttng_event **chan_table, struct lttng_channel *chan, |
680 | void *filter, enum sc_type type) | |
259b6cb3 | 681 | { |
2a0c4816 | 682 | const struct lttng_event_desc *desc; |
259b6cb3 | 683 | unsigned int i; |
49c50022 MD |
684 | |
685 | /* Allocate events for each syscall, insert into table */ | |
686 | for (i = 0; i < table_len; i++) { | |
687 | struct lttng_kernel_event ev; | |
2a0c4816 | 688 | desc = table[i].desc; |
49c50022 MD |
689 | |
690 | if (!desc) { | |
691 | /* Unknown syscall */ | |
692 | continue; | |
693 | } | |
694 | /* | |
695 | * Skip those already populated by previous failed | |
696 | * register for this channel. | |
697 | */ | |
698 | if (chan_table[i]) | |
699 | continue; | |
700 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
701 | switch (type) { |
702 | case SC_TYPE_ENTRY: | |
703 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
704 | LTTNG_KERNEL_SYM_NAME_LEN); | |
705 | break; | |
706 | case SC_TYPE_EXIT: | |
707 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
708 | LTTNG_KERNEL_SYM_NAME_LEN); | |
709 | break; | |
710 | case SC_TYPE_COMPAT_ENTRY: | |
711 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
712 | LTTNG_KERNEL_SYM_NAME_LEN); | |
713 | break; | |
714 | case SC_TYPE_COMPAT_EXIT: | |
715 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
716 | LTTNG_KERNEL_SYM_NAME_LEN); | |
717 | break; | |
718 | default: | |
719 | BUG_ON(1); | |
720 | break; | |
721 | } | |
722 | strncat(ev.name, desc->name, | |
723 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 724 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
725 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
726 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 727 | desc, ev.instrumentation); |
abc0446a MD |
728 | WARN_ON_ONCE(!chan_table[i]); |
729 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
730 | /* |
731 | * If something goes wrong in event registration | |
732 | * after the first one, we have no choice but to | |
733 | * leave the previous events in there, until | |
734 | * deleted by session teardown. | |
735 | */ | |
abc0446a | 736 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
737 | } |
738 | } | |
739 | return 0; | |
740 | } | |
741 | ||
33a39a3c MD |
742 | /* |
743 | * Should be called with sessions lock held. | |
744 | */ | |
a90917c3 | 745 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 746 | { |
2a0c4816 | 747 | struct lttng_kernel_event ev; |
259b6cb3 MD |
748 | int ret; |
749 | ||
750 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
751 | |
752 | if (!chan->sc_table) { | |
753 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 754 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
755 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
756 | if (!chan->sc_table) | |
757 | return -ENOMEM; | |
758 | } | |
5b7ac358 MD |
759 | if (!chan->sc_exit_table) { |
760 | /* create syscall table mapping syscall to events */ | |
761 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
762 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
763 | if (!chan->sc_exit_table) | |
764 | return -ENOMEM; | |
765 | } | |
766 | ||
259b6cb3 | 767 | |
49c50022 MD |
768 | #ifdef CONFIG_COMPAT |
769 | if (!chan->compat_sc_table) { | |
770 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 771 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 772 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
773 | if (!chan->compat_sc_table) |
774 | return -ENOMEM; | |
775 | } | |
5b7ac358 MD |
776 | |
777 | if (!chan->compat_sc_exit_table) { | |
778 | /* create syscall table mapping compat syscall to events */ | |
779 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
780 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
781 | if (!chan->compat_sc_exit_table) | |
782 | return -ENOMEM; | |
783 | } | |
49c50022 | 784 | #endif |
f405cfce | 785 | if (!chan->sc_unknown) { |
f405cfce | 786 | const struct lttng_event_desc *desc = |
d4291869 | 787 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 788 | |
f405cfce | 789 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
790 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
791 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
792 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
793 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
794 | desc, |
795 | ev.instrumentation); | |
abc0446a MD |
796 | WARN_ON_ONCE(!chan->sc_unknown); |
797 | if (IS_ERR(chan->sc_unknown)) { | |
798 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
799 | } |
800 | } | |
801 | ||
b76dc1a0 | 802 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 803 | const struct lttng_event_desc *desc = |
d4291869 | 804 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
805 | |
806 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
807 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
808 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
809 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
810 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
811 | desc, |
812 | ev.instrumentation); | |
abc0446a MD |
813 | WARN_ON_ONCE(!chan->sc_unknown); |
814 | if (IS_ERR(chan->sc_compat_unknown)) { | |
815 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
816 | } |
817 | } | |
818 | ||
5b7ac358 | 819 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 820 | const struct lttng_event_desc *desc = |
5b7ac358 | 821 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
822 | |
823 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
824 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
825 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
826 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
827 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, | |
3c997079 MD |
828 | filter, desc, |
829 | ev.instrumentation); | |
5b7ac358 MD |
830 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
831 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
832 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
833 | } | |
834 | } | |
835 | ||
836 | if (!chan->sc_exit_unknown) { | |
837 | const struct lttng_event_desc *desc = | |
838 | &__event_desc___syscall_exit_unknown; | |
839 | ||
840 | memset(&ev, 0, sizeof(ev)); | |
841 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
842 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
843 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
844 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 845 | desc, ev.instrumentation); |
5b7ac358 MD |
846 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
847 | if (IS_ERR(chan->sc_exit_unknown)) { | |
848 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
849 | } |
850 | } | |
851 | ||
49c50022 | 852 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
853 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
854 | if (ret) | |
855 | return ret; | |
856 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
857 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
858 | if (ret) |
859 | return ret; | |
5b7ac358 | 860 | |
49c50022 | 861 | #ifdef CONFIG_COMPAT |
a93244f8 | 862 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
863 | chan->compat_sc_table, chan, filter, |
864 | SC_TYPE_COMPAT_ENTRY); | |
865 | if (ret) | |
866 | return ret; | |
867 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
868 | chan->compat_sc_exit_table, chan, filter, | |
869 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
870 | if (ret) |
871 | return ret; | |
872 | #endif | |
80f87dd2 MD |
873 | if (!chan->sys_enter_registered) { |
874 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
875 | (void *) syscall_entry_probe, chan); | |
876 | if (ret) | |
877 | return ret; | |
878 | chan->sys_enter_registered = 1; | |
879 | } | |
63728b02 MD |
880 | /* |
881 | * We change the name of sys_exit tracepoint due to namespace | |
882 | * conflict with sys_exit syscall entry. | |
883 | */ | |
80f87dd2 MD |
884 | if (!chan->sys_exit_registered) { |
885 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 886 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
887 | if (ret) { |
888 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
889 | (void *) syscall_entry_probe, chan)); | |
890 | return ret; | |
891 | } | |
892 | chan->sys_exit_registered = 1; | |
63728b02 | 893 | } |
259b6cb3 MD |
894 | return ret; |
895 | } | |
896 | ||
897 | /* | |
898 | * Only called at session destruction. | |
899 | */ | |
a90917c3 | 900 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
901 | { |
902 | int ret; | |
903 | ||
904 | if (!chan->sc_table) | |
905 | return 0; | |
80f87dd2 MD |
906 | if (chan->sys_enter_registered) { |
907 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
5b7ac358 | 908 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
909 | if (ret) |
910 | return ret; | |
911 | chan->sys_enter_registered = 0; | |
912 | } | |
913 | if (chan->sys_exit_registered) { | |
914 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
915 | (void *) syscall_entry_probe, chan); | |
916 | if (ret) | |
917 | return ret; | |
918 | chan->sys_exit_registered = 0; | |
919 | } | |
a90917c3 | 920 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 921 | kfree(chan->sc_table); |
5b7ac358 | 922 | kfree(chan->sc_exit_table); |
49c50022 MD |
923 | #ifdef CONFIG_COMPAT |
924 | kfree(chan->compat_sc_table); | |
5b7ac358 | 925 | kfree(chan->compat_sc_exit_table); |
49c50022 | 926 | #endif |
80f87dd2 MD |
927 | kfree(chan->sc_filter); |
928 | return 0; | |
929 | } | |
930 | ||
931 | static | |
932 | int get_syscall_nr(const char *syscall_name) | |
933 | { | |
934 | int syscall_nr = -1; | |
935 | int i; | |
936 | ||
937 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
938 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 939 | const char *it_name; |
80f87dd2 MD |
940 | |
941 | entry = &sc_table[i]; | |
942 | if (!entry->desc) | |
943 | continue; | |
5b7ac358 MD |
944 | it_name = entry->desc->name; |
945 | it_name += strlen(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 | ||
954 | static | |
955 | int get_compat_syscall_nr(const char *syscall_name) | |
956 | { | |
957 | int syscall_nr = -1; | |
958 | int i; | |
959 | ||
960 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
961 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 962 | const char *it_name; |
80f87dd2 MD |
963 | |
964 | entry = &compat_sc_table[i]; | |
965 | if (!entry->desc) | |
966 | continue; | |
5b7ac358 MD |
967 | it_name = entry->desc->name; |
968 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
969 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
970 | syscall_nr = i; |
971 | break; | |
972 | } | |
973 | } | |
974 | return syscall_nr; | |
975 | } | |
976 | ||
12e579db MD |
977 | static |
978 | uint32_t get_sc_tables_len(void) | |
979 | { | |
980 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
981 | } | |
982 | ||
80f87dd2 MD |
983 | int lttng_syscall_filter_enable(struct lttng_channel *chan, |
984 | const char *name) | |
985 | { | |
986 | int syscall_nr, compat_syscall_nr, ret; | |
987 | struct lttng_syscall_filter *filter; | |
988 | ||
989 | WARN_ON_ONCE(!chan->sc_table); | |
990 | ||
991 | if (!name) { | |
992 | /* Enable all system calls by removing filter */ | |
993 | if (chan->sc_filter) { | |
994 | filter = chan->sc_filter; | |
995 | rcu_assign_pointer(chan->sc_filter, NULL); | |
996 | synchronize_trace(); | |
997 | kfree(filter); | |
998 | } | |
999 | chan->syscall_all = 1; | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | if (!chan->sc_filter) { | |
1004 | if (chan->syscall_all) { | |
1005 | /* | |
1006 | * All syscalls are already enabled. | |
1007 | */ | |
1008 | return -EEXIST; | |
1009 | } | |
1010 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1011 | GFP_KERNEL); | |
1012 | if (!filter) | |
1013 | return -ENOMEM; | |
1014 | } else { | |
1015 | filter = chan->sc_filter; | |
1016 | } | |
1017 | syscall_nr = get_syscall_nr(name); | |
1018 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1019 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1020 | ret = -ENOENT; | |
1021 | goto error; | |
1022 | } | |
1023 | if (syscall_nr >= 0) { | |
1024 | if (test_bit(syscall_nr, filter->sc)) { | |
1025 | ret = -EEXIST; | |
1026 | goto error; | |
1027 | } | |
1028 | bitmap_set(filter->sc, syscall_nr, 1); | |
1029 | } | |
1030 | if (compat_syscall_nr >= 0) { | |
1031 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1032 | ret = -EEXIST; | |
1033 | goto error; | |
1034 | } | |
1035 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1036 | } | |
1037 | if (!chan->sc_filter) | |
1038 | rcu_assign_pointer(chan->sc_filter, filter); | |
1039 | return 0; | |
1040 | ||
1041 | error: | |
1042 | if (!chan->sc_filter) | |
1043 | kfree(filter); | |
1044 | return ret; | |
1045 | } | |
1046 | ||
1047 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
1048 | const char *name) | |
1049 | { | |
1050 | int syscall_nr, compat_syscall_nr, ret; | |
1051 | struct lttng_syscall_filter *filter; | |
1052 | ||
1053 | WARN_ON_ONCE(!chan->sc_table); | |
1054 | ||
1055 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1056 | if (!chan->syscall_all) |
1057 | return -EEXIST; | |
80f87dd2 MD |
1058 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1059 | GFP_KERNEL); | |
1060 | if (!filter) | |
1061 | return -ENOMEM; | |
1062 | /* Trace all system calls, then apply disable. */ | |
1063 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1064 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1065 | } else { | |
1066 | filter = chan->sc_filter; | |
1067 | } | |
1068 | ||
72814741 | 1069 | if (!name) { |
404e87bf MD |
1070 | /* Fail if all syscalls are already disabled. */ |
1071 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1072 | && bitmap_empty(filter->sc_compat, | |
1073 | NR_compat_syscalls)) { | |
1074 | ret = -EEXIST; | |
1075 | goto error; | |
1076 | } | |
1077 | ||
72814741 MD |
1078 | /* Disable all system calls */ |
1079 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1080 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1081 | goto apply_filter; | |
1082 | } | |
80f87dd2 MD |
1083 | syscall_nr = get_syscall_nr(name); |
1084 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1085 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1086 | ret = -ENOENT; | |
1087 | goto error; | |
1088 | } | |
1089 | if (syscall_nr >= 0) { | |
cecef7f8 | 1090 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1091 | ret = -EEXIST; |
1092 | goto error; | |
1093 | } | |
cecef7f8 | 1094 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1095 | } |
1096 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1097 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1098 | ret = -EEXIST; |
1099 | goto error; | |
1100 | } | |
cecef7f8 | 1101 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1102 | } |
72814741 | 1103 | apply_filter: |
80f87dd2 MD |
1104 | if (!chan->sc_filter) |
1105 | rcu_assign_pointer(chan->sc_filter, filter); | |
1106 | chan->syscall_all = 0; | |
259b6cb3 | 1107 | return 0; |
80f87dd2 MD |
1108 | |
1109 | error: | |
1110 | if (!chan->sc_filter) | |
1111 | kfree(filter); | |
1112 | return ret; | |
259b6cb3 | 1113 | } |
2d2464bd MD |
1114 | |
1115 | static | |
1116 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1117 | { | |
1118 | const struct trace_syscall_entry *entry; | |
1119 | int iter = 0; | |
1120 | ||
1121 | for (entry = sc_table; | |
1122 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1123 | entry++) { | |
1124 | if (iter++ >= *pos) | |
1125 | return entry; | |
1126 | } | |
1127 | for (entry = compat_sc_table; | |
1128 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1129 | entry++) { | |
1130 | if (iter++ >= *pos) | |
1131 | return entry; | |
1132 | } | |
1133 | /* End of list */ | |
1134 | return NULL; | |
1135 | } | |
1136 | ||
1137 | static | |
1138 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1139 | { | |
1140 | return (void *) syscall_list_get_entry(pos); | |
1141 | } | |
1142 | ||
1143 | static | |
1144 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1145 | { | |
1146 | (*ppos)++; | |
1147 | return (void *) syscall_list_get_entry(ppos); | |
1148 | } | |
1149 | ||
1150 | static | |
1151 | void syscall_list_stop(struct seq_file *m, void *p) | |
1152 | { | |
1153 | } | |
1154 | ||
12e579db MD |
1155 | static |
1156 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1157 | const struct trace_syscall_entry **table, | |
1158 | unsigned int *bitness) | |
1159 | { | |
1160 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1161 | if (bitness) | |
1162 | *bitness = BITS_PER_LONG; | |
1163 | if (table) | |
1164 | *table = sc_table; | |
1165 | return 0; | |
1166 | } | |
1167 | if (!(entry >= compat_sc_table | |
1168 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1169 | return -EINVAL; | |
1170 | } | |
1171 | if (bitness) | |
1172 | *bitness = 32; | |
1173 | if (table) | |
1174 | *table = compat_sc_table; | |
1175 | return 0; | |
1176 | } | |
1177 | ||
2d2464bd MD |
1178 | static |
1179 | int syscall_list_show(struct seq_file *m, void *p) | |
1180 | { | |
1181 | const struct trace_syscall_entry *table, *entry = p; | |
1182 | unsigned int bitness; | |
d4291869 | 1183 | unsigned long index; |
12e579db | 1184 | int ret; |
d4291869 | 1185 | const char *name; |
2d2464bd | 1186 | |
12e579db MD |
1187 | ret = get_sc_table(entry, &table, &bitness); |
1188 | if (ret) | |
1189 | return ret; | |
f4855b46 MD |
1190 | if (!entry->desc) |
1191 | return 0; | |
d4291869 MD |
1192 | if (table == sc_table) { |
1193 | index = entry - table; | |
1194 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1195 | } else { | |
1196 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1197 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1198 | } | |
12e579db | 1199 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1200 | index, name, bitness); |
2d2464bd MD |
1201 | return 0; |
1202 | } | |
1203 | ||
1204 | static | |
1205 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1206 | .start = syscall_list_start, | |
1207 | .next = syscall_list_next, | |
1208 | .stop = syscall_list_stop, | |
1209 | .show = syscall_list_show, | |
1210 | }; | |
1211 | ||
1212 | static | |
1213 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1214 | { | |
1215 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1216 | } | |
1217 | ||
1218 | const struct file_operations lttng_syscall_list_fops = { | |
1219 | .owner = THIS_MODULE, | |
1220 | .open = lttng_syscall_list_open, | |
1221 | .read = seq_read, | |
1222 | .llseek = seq_lseek, | |
1223 | .release = seq_release, | |
1224 | }; | |
12e579db MD |
1225 | |
1226 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1227 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1228 | { | |
1229 | uint32_t len, sc_tables_len, bitmask_len; | |
1230 | int ret = 0, bit; | |
1231 | char *tmp_mask; | |
1232 | struct lttng_syscall_filter *filter; | |
1233 | ||
1234 | ret = get_user(len, &usyscall_mask->len); | |
1235 | if (ret) | |
1236 | return ret; | |
1237 | sc_tables_len = get_sc_tables_len(); | |
1238 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1239 | if (len < sc_tables_len) { | |
1240 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1241 | } | |
1242 | /* Array is large enough, we can copy array to user-space. */ | |
1243 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1244 | if (!tmp_mask) | |
1245 | return -ENOMEM; | |
1246 | filter = channel->sc_filter; | |
1247 | ||
1248 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1249 | char state; |
2f25059d MD |
1250 | |
1251 | if (channel->sc_table) { | |
1252 | if (filter) | |
1253 | state = test_bit(bit, filter->sc); | |
1254 | else | |
1255 | state = 1; | |
1256 | } else { | |
1257 | state = 0; | |
1258 | } | |
1259 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1260 | } |
1261 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1262 | char state; |
2f25059d MD |
1263 | |
1264 | if (channel->compat_sc_table) { | |
1265 | if (filter) | |
1266 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1267 | filter->sc_compat); | |
1268 | else | |
1269 | state = 1; | |
1270 | } else { | |
1271 | state = 0; | |
1272 | } | |
1273 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1274 | } |
1275 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1276 | ret = -EFAULT; | |
1277 | kfree(tmp_mask); | |
1278 | return ret; | |
1279 | } | |
082d4946 MD |
1280 | |
1281 | int lttng_abi_syscall_list(void) | |
1282 | { | |
1283 | struct file *syscall_list_file; | |
1284 | int file_fd, ret; | |
1285 | ||
4ac10b76 | 1286 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1287 | if (file_fd < 0) { |
1288 | ret = file_fd; | |
1289 | goto fd_error; | |
1290 | } | |
1291 | ||
1292 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1293 | <tng_syscall_list_fops, | |
1294 | NULL, O_RDWR); | |
1295 | if (IS_ERR(syscall_list_file)) { | |
1296 | ret = PTR_ERR(syscall_list_file); | |
1297 | goto file_error; | |
1298 | } | |
1299 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1300 | if (ret < 0) | |
1301 | goto open_error; | |
1302 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1303 | return file_fd; |
1304 | ||
1305 | open_error: | |
1306 | fput(syscall_list_file); | |
1307 | file_error: | |
1308 | put_unused_fd(file_fd); | |
1309 | fd_error: | |
1310 | return ret; | |
1311 | } |