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> | |
1b7b9c65 | 28 | #include <wrapper/syscall.h> |
241ae9a8 | 29 | #include <lttng-events.h> |
63629d86 | 30 | #include <lttng-utils.h> |
259b6cb3 | 31 | |
6333ace3 | 32 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
33 | # ifndef is_compat_task |
34 | # define is_compat_task() (0) | |
35 | # endif | |
6333ace3 MD |
36 | #endif |
37 | ||
1aa3298b MD |
38 | /* in_compat_syscall appears in kernel 4.6. */ |
39 | #ifndef in_compat_syscall | |
40 | #define in_compat_syscall() is_compat_task() | |
41 | #endif | |
42 | ||
5b7ac358 MD |
43 | enum sc_type { |
44 | SC_TYPE_ENTRY, | |
45 | SC_TYPE_EXIT, | |
46 | SC_TYPE_COMPAT_ENTRY, | |
47 | SC_TYPE_COMPAT_EXIT, | |
48 | }; | |
49 | ||
d4291869 MD |
50 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
51 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
52 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
53 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
54 | ||
55 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
56 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
57 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
58 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 59 | |
a93244f8 | 60 | static |
63629d86 | 61 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 | 62 | static |
63629d86 | 63 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 64 | |
3a523f5b MD |
65 | /* |
66 | * Forward declarations for old kernels. | |
67 | */ | |
68 | struct mmsghdr; | |
69 | struct rlimit64; | |
70 | struct oldold_utsname; | |
71 | struct old_utsname; | |
72 | struct sel_arg_struct; | |
73 | struct mmap_arg_struct; | |
c0b71117 | 74 | struct file_handle; |
a292e6f1 | 75 | struct user_msghdr; |
3a523f5b | 76 | |
80f87dd2 MD |
77 | #ifdef IA32_NR_syscalls |
78 | #define NR_compat_syscalls IA32_NR_syscalls | |
79 | #else | |
80 | #define NR_compat_syscalls NR_syscalls | |
81 | #endif | |
82 | ||
259b6cb3 MD |
83 | /* |
84 | * Create LTTng tracepoint probes. | |
85 | */ | |
86 | #define LTTNG_PACKAGE_BUILD | |
87 | #define CREATE_TRACE_POINTS | |
2655f9ad | 88 | #define TP_MODULE_NOINIT |
c075712b | 89 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 90 | |
a93244f8 MD |
91 | #define PARAMS(args...) args |
92 | ||
5b7ac358 | 93 | /* Handle unknown syscalls */ |
72a52753 | 94 | #undef TRACE_SYSTEM |
5b7ac358 | 95 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 96 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
97 | #undef TRACE_SYSTEM |
98 | ||
fc4f7161 MD |
99 | #define SC_ENTER |
100 | ||
fc4f7161 MD |
101 | #undef sc_exit |
102 | #define sc_exit(...) | |
b75d00c4 MD |
103 | #undef sc_in |
104 | #define sc_in(...) __VA_ARGS__ | |
105 | #undef sc_out | |
106 | #define sc_out(...) | |
107 | #undef sc_inout | |
108 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
109 | |
110 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 111 | #undef TP_PROBE_CB |
63629d86 | 112 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
57ede728 | 113 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 114 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 115 | PARAMS(_fields)) |
265822ae | 116 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 117 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
118 | PARAMS(_locvar), PARAMS(_code_pre), \ |
119 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
120 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
121 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 122 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 123 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
124 | /* Enumerations only defined at first inclusion. */ |
125 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
126 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 127 | #undef TRACE_SYSTEM |
d4291869 | 128 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 129 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 130 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 131 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 132 | #undef TRACE_SYSTEM |
d4291869 | 133 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 134 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 135 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 136 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 137 | #undef TRACE_SYSTEM |
141ddf28 | 138 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
139 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
140 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
141 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
142 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 143 | #undef TP_PROBE_CB |
3bc29f0a MD |
144 | #undef _TRACE_SYSCALLS_INTEGERS_H |
145 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
146 | |
147 | /* Hijack probe callback for compat system call enter */ | |
63629d86 | 148 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
771af27e | 149 | #define LTTNG_SC_COMPAT |
57ede728 | 150 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 151 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 152 | PARAMS(_fields)) |
265822ae | 153 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 154 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 155 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
156 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
157 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 158 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
159 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
160 | compat_syscall_entry_##_name) | |
141ddf28 MD |
161 | /* Enumerations only defined at inital inclusion (not here). */ |
162 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 163 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 164 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 165 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
166 | #undef TRACE_INCLUDE_FILE |
167 | #undef TRACE_SYSTEM | |
d4291869 | 168 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 169 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 170 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
171 | #undef TRACE_INCLUDE_FILE |
172 | #undef TRACE_SYSTEM | |
141ddf28 | 173 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
174 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
175 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
176 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
177 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 178 | #undef TP_PROBE_CB |
3bc29f0a MD |
179 | #undef _TRACE_SYSCALLS_INTEGERS_H |
180 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 181 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 182 | |
fc4f7161 MD |
183 | #undef SC_ENTER |
184 | ||
185 | #define SC_EXIT | |
186 | ||
fc4f7161 MD |
187 | #undef sc_exit |
188 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
189 | #undef sc_in |
190 | #define sc_in(...) | |
191 | #undef sc_out | |
192 | #define sc_out(...) __VA_ARGS__ | |
193 | #undef sc_inout | |
194 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
195 | |
196 | /* Hijack probe callback for system call exit */ | |
63629d86 | 197 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
57ede728 | 198 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 199 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 200 | PARAMS(_fields)) |
265822ae | 201 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 202 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 203 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
204 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
205 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
206 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
207 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 208 | syscall_exit_##_name) |
141ddf28 MD |
209 | /* Enumerations only defined at inital inclusion (not here). */ |
210 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
211 | #define TRACE_SYSTEM syscall_exit_integers |
212 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 213 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
214 | #undef TRACE_INCLUDE_FILE |
215 | #undef TRACE_SYSTEM | |
216 | #define TRACE_SYSTEM syscall_exit_pointers | |
217 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 218 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
219 | #undef TRACE_INCLUDE_FILE |
220 | #undef TRACE_SYSTEM | |
141ddf28 | 221 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
222 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
223 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
224 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
225 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 226 | #undef TP_PROBE_CB |
3bc29f0a MD |
227 | #undef _TRACE_SYSCALLS_INTEGERS_H |
228 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
229 | |
230 | ||
231 | /* Hijack probe callback for compat system call exit */ | |
63629d86 | 232 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
771af27e | 233 | #define LTTNG_SC_COMPAT |
57ede728 | 234 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 235 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 236 | PARAMS(_fields)) |
265822ae | 237 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 238 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 239 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
240 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
241 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 242 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 243 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 244 | compat_syscall_exit_##_name) |
141ddf28 MD |
245 | /* Enumerations only defined at inital inclusion (not here). */ |
246 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
247 | #define TRACE_SYSTEM compat_syscall_exit_integers |
248 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 249 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 250 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 251 | #undef TRACE_SYSTEM |
5b7ac358 MD |
252 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
253 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 254 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 255 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 256 | #undef TRACE_SYSTEM |
141ddf28 | 257 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
258 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
259 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
260 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
261 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 262 | #undef TP_PROBE_CB |
3bc29f0a MD |
263 | #undef _TRACE_SYSCALLS_INTEGERS_H |
264 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 265 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 266 | |
fc4f7161 | 267 | #undef SC_EXIT |
259b6cb3 | 268 | |
2655f9ad | 269 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
270 | #undef LTTNG_PACKAGE_BUILD |
271 | #undef CREATE_TRACE_POINTS | |
272 | ||
a93244f8 | 273 | struct trace_syscall_entry { |
63629d86 FD |
274 | void *event_func; |
275 | void *trigger_func; | |
a93244f8 MD |
276 | const struct lttng_event_desc *desc; |
277 | const struct lttng_event_field *fields; | |
278 | unsigned int nrargs; | |
279 | }; | |
280 | ||
281 | #define CREATE_SYSCALL_TABLE | |
282 | ||
fc4f7161 MD |
283 | #define SC_ENTER |
284 | ||
285 | #undef sc_exit | |
286 | #define sc_exit(...) | |
287 | ||
259b6cb3 | 288 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 289 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 290 | [ _nr ] = { \ |
63629d86 FD |
291 | .event_func = __event_probe__syscall_entry_##_template, \ |
292 | .trigger_func = __trigger_probe__syscall_entry_##_template, \ | |
259b6cb3 | 293 | .nrargs = (_nrargs), \ |
d4291869 MD |
294 | .fields = __event_fields___syscall_entry_##_template, \ |
295 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
296 | }, |
297 | ||
63629d86 | 298 | /* Event syscall enter tracing table */ |
49c50022 | 299 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
300 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
301 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
302 | }; |
303 | ||
a93244f8 MD |
304 | #undef TRACE_SYSCALL_TABLE |
305 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
306 | [ _nr ] = { \ | |
63629d86 FD |
307 | .event_func = __event_probe__compat_syscall_entry_##_template, \ |
308 | .trigger_func = __trigger_probe__compat_syscall_entry_##_template, \ | |
a93244f8 | 309 | .nrargs = (_nrargs), \ |
d4291869 MD |
310 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
311 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
312 | }, |
313 | ||
63629d86 | 314 | /* Event compat syscall enter table */ |
a93244f8 | 315 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
316 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
317 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 318 | }; |
259b6cb3 | 319 | |
fc4f7161 MD |
320 | #undef SC_ENTER |
321 | ||
322 | #define SC_EXIT | |
323 | ||
324 | #undef sc_exit | |
325 | #define sc_exit(...) __VA_ARGS__ | |
326 | ||
5b7ac358 MD |
327 | #undef TRACE_SYSCALL_TABLE |
328 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
329 | [ _nr ] = { \ | |
63629d86 FD |
330 | .event_func = __event_probe__syscall_exit_##_template, \ |
331 | .trigger_func = __trigger_probe__syscall_exit_##_template, \ | |
5b7ac358 MD |
332 | .nrargs = (_nrargs), \ |
333 | .fields = __event_fields___syscall_exit_##_template, \ | |
334 | .desc = &__event_desc___syscall_exit_##_name, \ | |
335 | }, | |
336 | ||
63629d86 | 337 | /* Event syscall exit table */ |
5b7ac358 | 338 | static const struct trace_syscall_entry sc_exit_table[] = { |
241ae9a8 MD |
339 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
340 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
341 | }; |
342 | ||
343 | #undef TRACE_SYSCALL_TABLE | |
344 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
345 | [ _nr ] = { \ | |
63629d86 FD |
346 | .event_func = __event_probe__compat_syscall_exit_##_template, \ |
347 | .trigger_func = __trigger_probe__compat_syscall_exit_##_template, \ | |
5b7ac358 MD |
348 | .nrargs = (_nrargs), \ |
349 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
350 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
351 | }, | |
352 | ||
63629d86 | 353 | /* Event compat syscall exit table */ |
5b7ac358 | 354 | const struct trace_syscall_entry compat_sc_exit_table[] = { |
241ae9a8 MD |
355 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
356 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
357 | }; |
358 | ||
fc4f7161 MD |
359 | #undef SC_EXIT |
360 | ||
a93244f8 | 361 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 362 | |
80f87dd2 MD |
363 | struct lttng_syscall_filter { |
364 | DECLARE_BITMAP(sc, NR_syscalls); | |
365 | DECLARE_BITMAP(sc_compat, NR_compat_syscalls); | |
366 | }; | |
367 | ||
63629d86 | 368 | static void syscall_entry_event_unknown(struct lttng_event *event, |
f405cfce MD |
369 | struct pt_regs *regs, unsigned int id) |
370 | { | |
1b7b9c65 | 371 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 372 | |
1b7b9c65 | 373 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 374 | if (unlikely(in_compat_syscall())) |
d4291869 | 375 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 376 | else |
d4291869 | 377 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
378 | } |
379 | ||
63629d86 FD |
380 | static __always_inline |
381 | void syscall_entry_call_func(void *func, unsigned int nrargs, void *data, | |
382 | struct pt_regs *regs) | |
259b6cb3 | 383 | { |
63629d86 | 384 | switch (nrargs) { |
259b6cb3 MD |
385 | case 0: |
386 | { | |
63629d86 | 387 | void (*fptr)(void *__data) = func; |
259b6cb3 | 388 | |
63629d86 | 389 | fptr(data); |
259b6cb3 MD |
390 | break; |
391 | } | |
392 | case 1: | |
393 | { | |
63629d86 | 394 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 395 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 396 | |
1b7b9c65 | 397 | lttng_syscall_get_arguments(current, regs, args); |
63629d86 | 398 | fptr(data, args[0]); |
259b6cb3 MD |
399 | break; |
400 | } | |
401 | case 2: | |
402 | { | |
403 | void (*fptr)(void *__data, | |
404 | unsigned long arg0, | |
63629d86 | 405 | unsigned long arg1) = func; |
1b7b9c65 | 406 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 407 | |
1b7b9c65 | 408 | lttng_syscall_get_arguments(current, regs, args); |
63629d86 | 409 | fptr(data, args[0], args[1]); |
259b6cb3 MD |
410 | break; |
411 | } | |
412 | case 3: | |
413 | { | |
414 | void (*fptr)(void *__data, | |
415 | unsigned long arg0, | |
416 | unsigned long arg1, | |
63629d86 | 417 | unsigned long arg2) = func; |
1b7b9c65 | 418 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 419 | |
1b7b9c65 | 420 | lttng_syscall_get_arguments(current, regs, args); |
63629d86 | 421 | fptr(data, args[0], args[1], args[2]); |
259b6cb3 MD |
422 | break; |
423 | } | |
424 | case 4: | |
425 | { | |
426 | void (*fptr)(void *__data, | |
427 | unsigned long arg0, | |
428 | unsigned long arg1, | |
429 | unsigned long arg2, | |
63629d86 | 430 | unsigned long arg3) = func; |
1b7b9c65 | 431 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 432 | |
1b7b9c65 | 433 | lttng_syscall_get_arguments(current, regs, args); |
63629d86 | 434 | fptr(data, args[0], args[1], args[2], args[3]); |
259b6cb3 MD |
435 | break; |
436 | } | |
437 | case 5: | |
438 | { | |
439 | void (*fptr)(void *__data, | |
440 | unsigned long arg0, | |
441 | unsigned long arg1, | |
442 | unsigned long arg2, | |
443 | unsigned long arg3, | |
63629d86 | 444 | unsigned long arg4) = func; |
1b7b9c65 | 445 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 446 | |
1b7b9c65 | 447 | lttng_syscall_get_arguments(current, regs, args); |
63629d86 | 448 | fptr(data, args[0], args[1], args[2], args[3], args[4]); |
259b6cb3 MD |
449 | break; |
450 | } | |
451 | case 6: | |
452 | { | |
453 | void (*fptr)(void *__data, | |
454 | unsigned long arg0, | |
455 | unsigned long arg1, | |
456 | unsigned long arg2, | |
457 | unsigned long arg3, | |
458 | unsigned long arg4, | |
63629d86 | 459 | unsigned long arg5) = func; |
1b7b9c65 | 460 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 461 | |
1b7b9c65 | 462 | lttng_syscall_get_arguments(current, regs, args); |
63629d86 | 463 | fptr(data, args[0], args[1], args[2], |
259b6cb3 MD |
464 | args[3], args[4], args[5]); |
465 | break; | |
466 | } | |
467 | default: | |
468 | break; | |
469 | } | |
470 | } | |
471 | ||
63629d86 FD |
472 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
473 | { | |
474 | struct lttng_channel *chan = __data; | |
475 | struct lttng_syscall_filter *filter; | |
476 | struct lttng_event *event, *unknown_event; | |
477 | const struct trace_syscall_entry *table, *entry; | |
478 | size_t table_len; | |
479 | ||
480 | filter = lttng_rcu_dereference(chan->sc_filter); | |
481 | ||
482 | if (unlikely(in_compat_syscall())) { | |
483 | if (filter) { | |
484 | if (id < 0 || id >= NR_compat_syscalls | |
485 | || !test_bit(id, filter->sc_compat)) { | |
486 | /* System call filtered out. */ | |
487 | return; | |
488 | } | |
489 | } | |
490 | table = compat_sc_table; | |
491 | table_len = ARRAY_SIZE(compat_sc_table); | |
492 | unknown_event = chan->sc_compat_unknown; | |
493 | } else { | |
494 | if (filter) { | |
495 | if (id < 0 || id >= NR_syscalls | |
496 | || !test_bit(id, filter->sc)) { | |
497 | /* System call filtered out. */ | |
498 | return; | |
499 | } | |
500 | } | |
501 | table = sc_table; | |
502 | table_len = ARRAY_SIZE(sc_table); | |
503 | unknown_event = chan->sc_unknown; | |
504 | } | |
505 | if (unlikely(id < 0 || id >= table_len)) { | |
506 | syscall_entry_event_unknown(unknown_event, regs, id); | |
507 | return; | |
508 | } | |
509 | if (unlikely(in_compat_syscall())) | |
510 | event = chan->compat_sc_table[id]; | |
511 | else | |
512 | event = chan->sc_table[id]; | |
513 | if (unlikely(!event)) { | |
514 | syscall_entry_event_unknown(unknown_event, regs, id); | |
515 | return; | |
516 | } | |
517 | entry = &table[id]; | |
518 | WARN_ON_ONCE(!entry); | |
519 | ||
520 | syscall_entry_call_func(entry->event_func, entry->nrargs, event, regs); | |
521 | } | |
522 | ||
523 | void syscall_entry_trigger_probe(void *__data, struct pt_regs *regs, long id) | |
524 | { | |
525 | struct lttng_trigger_group *trigger_group = __data; | |
526 | const struct trace_syscall_entry *entry; | |
527 | struct list_head *dispatch_list; | |
528 | struct lttng_trigger *iter; | |
529 | size_t table_len; | |
530 | ||
531 | ||
532 | if (unlikely(in_compat_syscall())) { | |
533 | table_len = ARRAY_SIZE(compat_sc_table); | |
534 | if (unlikely(id < 0 || id >= table_len)) { | |
535 | return; | |
536 | } | |
537 | entry = &compat_sc_table[id]; | |
538 | dispatch_list = &trigger_group->trigger_compat_syscall_dispatch[id]; | |
539 | } else { | |
540 | table_len = ARRAY_SIZE(sc_table); | |
541 | if (unlikely(id < 0 || id >= table_len)) { | |
542 | return; | |
543 | } | |
544 | entry = &sc_table[id]; | |
545 | dispatch_list = &trigger_group->trigger_syscall_dispatch[id]; | |
546 | } | |
547 | ||
548 | /* TODO handle unknown syscall */ | |
549 | ||
550 | list_for_each_entry_rcu(iter, dispatch_list, u.syscall.node) { | |
551 | BUG_ON(iter->u.syscall.syscall_id != id); | |
552 | syscall_entry_call_func(entry->trigger_func, entry->nrargs, iter, regs); | |
553 | } | |
554 | } | |
555 | ||
556 | static void syscall_exit_event_unknown(struct lttng_event *event, | |
74f7b56a | 557 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 558 | { |
1b7b9c65 | 559 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 560 | |
1b7b9c65 | 561 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 562 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
563 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
564 | args); | |
565 | else | |
566 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
567 | } | |
568 | ||
63629d86 | 569 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
5b7ac358 MD |
570 | { |
571 | struct lttng_channel *chan = __data; | |
63629d86 | 572 | struct lttng_syscall_filter *filter; |
5b7ac358 MD |
573 | struct lttng_event *event, *unknown_event; |
574 | const struct trace_syscall_entry *table, *entry; | |
575 | size_t table_len; | |
576 | long id; | |
577 | ||
63629d86 FD |
578 | filter = lttng_rcu_dereference(chan->sc_filter); |
579 | ||
5b7ac358 | 580 | id = syscall_get_nr(current, regs); |
1aa3298b | 581 | if (unlikely(in_compat_syscall())) { |
5b7ac358 | 582 | if (filter) { |
74f7b56a | 583 | if (id < 0 || id >= NR_compat_syscalls |
5b7ac358 MD |
584 | || !test_bit(id, filter->sc_compat)) { |
585 | /* System call filtered out. */ | |
586 | return; | |
587 | } | |
588 | } | |
589 | table = compat_sc_exit_table; | |
590 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
591 | unknown_event = chan->compat_sc_exit_unknown; | |
592 | } else { | |
5b7ac358 | 593 | if (filter) { |
74f7b56a | 594 | if (id < 0 || id >= NR_syscalls |
5b7ac358 MD |
595 | || !test_bit(id, filter->sc)) { |
596 | /* System call filtered out. */ | |
597 | return; | |
598 | } | |
599 | } | |
600 | table = sc_exit_table; | |
601 | table_len = ARRAY_SIZE(sc_exit_table); | |
602 | unknown_event = chan->sc_exit_unknown; | |
603 | } | |
74f7b56a | 604 | if (unlikely(id < 0 || id >= table_len)) { |
63629d86 | 605 | syscall_exit_event_unknown(unknown_event, regs, id, ret); |
5b7ac358 MD |
606 | return; |
607 | } | |
1aa3298b | 608 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
609 | event = chan->compat_sc_exit_table[id]; |
610 | else | |
611 | event = chan->sc_exit_table[id]; | |
612 | if (unlikely(!event)) { | |
63629d86 | 613 | syscall_exit_event_unknown(unknown_event, regs, id, ret); |
5b7ac358 MD |
614 | return; |
615 | } | |
616 | entry = &table[id]; | |
617 | WARN_ON_ONCE(!entry); | |
618 | ||
619 | switch (entry->nrargs) { | |
620 | case 0: | |
621 | { | |
63629d86 | 622 | void (*fptr)(void *__data, long ret) = entry->event_func; |
5b7ac358 | 623 | |
fc4f7161 | 624 | fptr(event, ret); |
5b7ac358 MD |
625 | break; |
626 | } | |
627 | case 1: | |
628 | { | |
629 | void (*fptr)(void *__data, | |
fc4f7161 | 630 | long ret, |
63629d86 | 631 | unsigned long arg0) = entry->event_func; |
1b7b9c65 | 632 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 633 | |
1b7b9c65 | 634 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 635 | fptr(event, ret, args[0]); |
5b7ac358 MD |
636 | break; |
637 | } | |
638 | case 2: | |
639 | { | |
640 | void (*fptr)(void *__data, | |
fc4f7161 | 641 | long ret, |
5b7ac358 | 642 | unsigned long arg0, |
63629d86 | 643 | unsigned long arg1) = entry->event_func; |
1b7b9c65 | 644 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 645 | |
1b7b9c65 | 646 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 647 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
648 | break; |
649 | } | |
650 | case 3: | |
651 | { | |
652 | void (*fptr)(void *__data, | |
fc4f7161 | 653 | long ret, |
5b7ac358 MD |
654 | unsigned long arg0, |
655 | unsigned long arg1, | |
63629d86 | 656 | unsigned long arg2) = entry->event_func; |
1b7b9c65 | 657 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 658 | |
1b7b9c65 | 659 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 660 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
661 | break; |
662 | } | |
663 | case 4: | |
664 | { | |
665 | void (*fptr)(void *__data, | |
fc4f7161 | 666 | long ret, |
5b7ac358 MD |
667 | unsigned long arg0, |
668 | unsigned long arg1, | |
669 | unsigned long arg2, | |
63629d86 | 670 | unsigned long arg3) = entry->event_func; |
1b7b9c65 | 671 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 672 | |
1b7b9c65 | 673 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 674 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
675 | break; |
676 | } | |
677 | case 5: | |
678 | { | |
679 | void (*fptr)(void *__data, | |
fc4f7161 | 680 | long ret, |
5b7ac358 MD |
681 | unsigned long arg0, |
682 | unsigned long arg1, | |
683 | unsigned long arg2, | |
684 | unsigned long arg3, | |
63629d86 | 685 | unsigned long arg4) = entry->event_func; |
1b7b9c65 | 686 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 687 | |
1b7b9c65 | 688 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 689 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
690 | break; |
691 | } | |
692 | case 6: | |
693 | { | |
694 | void (*fptr)(void *__data, | |
fc4f7161 | 695 | long ret, |
5b7ac358 MD |
696 | unsigned long arg0, |
697 | unsigned long arg1, | |
698 | unsigned long arg2, | |
699 | unsigned long arg3, | |
700 | unsigned long arg4, | |
63629d86 | 701 | unsigned long arg5) = entry->event_func; |
1b7b9c65 | 702 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 703 | |
1b7b9c65 | 704 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 705 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
706 | args[3], args[4], args[5]); |
707 | break; | |
708 | } | |
709 | default: | |
710 | break; | |
711 | } | |
712 | } | |
713 | ||
33a39a3c MD |
714 | /* |
715 | * noinline to diminish caller stack size. | |
716 | * Should be called with sessions lock held. | |
717 | */ | |
49c50022 | 718 | static |
63629d86 | 719 | int fill_event_table(const struct trace_syscall_entry *table, size_t table_len, |
5b7ac358 MD |
720 | struct lttng_event **chan_table, struct lttng_channel *chan, |
721 | void *filter, enum sc_type type) | |
259b6cb3 | 722 | { |
2a0c4816 | 723 | const struct lttng_event_desc *desc; |
259b6cb3 | 724 | unsigned int i; |
49c50022 MD |
725 | |
726 | /* Allocate events for each syscall, insert into table */ | |
727 | for (i = 0; i < table_len; i++) { | |
728 | struct lttng_kernel_event ev; | |
2a0c4816 | 729 | desc = table[i].desc; |
49c50022 MD |
730 | |
731 | if (!desc) { | |
732 | /* Unknown syscall */ | |
733 | continue; | |
734 | } | |
735 | /* | |
736 | * Skip those already populated by previous failed | |
737 | * register for this channel. | |
738 | */ | |
739 | if (chan_table[i]) | |
740 | continue; | |
741 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
742 | switch (type) { |
743 | case SC_TYPE_ENTRY: | |
744 | strncpy(ev.name, SYSCALL_ENTRY_STR, | |
745 | LTTNG_KERNEL_SYM_NAME_LEN); | |
746 | break; | |
747 | case SC_TYPE_EXIT: | |
748 | strncpy(ev.name, SYSCALL_EXIT_STR, | |
749 | LTTNG_KERNEL_SYM_NAME_LEN); | |
750 | break; | |
751 | case SC_TYPE_COMPAT_ENTRY: | |
752 | strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR, | |
753 | LTTNG_KERNEL_SYM_NAME_LEN); | |
754 | break; | |
755 | case SC_TYPE_COMPAT_EXIT: | |
756 | strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR, | |
757 | LTTNG_KERNEL_SYM_NAME_LEN); | |
758 | break; | |
759 | default: | |
760 | BUG_ON(1); | |
761 | break; | |
762 | } | |
763 | strncat(ev.name, desc->name, | |
764 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1); | |
f8695253 | 765 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
766 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
767 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 768 | desc, ev.instrumentation); |
abc0446a MD |
769 | WARN_ON_ONCE(!chan_table[i]); |
770 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
771 | /* |
772 | * If something goes wrong in event registration | |
773 | * after the first one, we have no choice but to | |
774 | * leave the previous events in there, until | |
775 | * deleted by session teardown. | |
776 | */ | |
abc0446a | 777 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
778 | } |
779 | } | |
780 | return 0; | |
781 | } | |
782 | ||
33a39a3c MD |
783 | /* |
784 | * Should be called with sessions lock held. | |
785 | */ | |
63629d86 | 786 | int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter) |
49c50022 | 787 | { |
2a0c4816 | 788 | struct lttng_kernel_event ev; |
259b6cb3 MD |
789 | int ret; |
790 | ||
791 | wrapper_vmalloc_sync_all(); | |
259b6cb3 MD |
792 | |
793 | if (!chan->sc_table) { | |
794 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 795 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
796 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
797 | if (!chan->sc_table) | |
798 | return -ENOMEM; | |
799 | } | |
5b7ac358 MD |
800 | if (!chan->sc_exit_table) { |
801 | /* create syscall table mapping syscall to events */ | |
802 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
803 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
804 | if (!chan->sc_exit_table) | |
805 | return -ENOMEM; | |
806 | } | |
807 | ||
259b6cb3 | 808 | |
49c50022 MD |
809 | #ifdef CONFIG_COMPAT |
810 | if (!chan->compat_sc_table) { | |
811 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 812 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 813 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
814 | if (!chan->compat_sc_table) |
815 | return -ENOMEM; | |
816 | } | |
5b7ac358 MD |
817 | |
818 | if (!chan->compat_sc_exit_table) { | |
819 | /* create syscall table mapping compat syscall to events */ | |
820 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
821 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
822 | if (!chan->compat_sc_exit_table) | |
823 | return -ENOMEM; | |
824 | } | |
49c50022 | 825 | #endif |
f405cfce | 826 | if (!chan->sc_unknown) { |
f405cfce | 827 | const struct lttng_event_desc *desc = |
d4291869 | 828 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 829 | |
f405cfce | 830 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
831 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
832 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
833 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
834 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
835 | desc, |
836 | ev.instrumentation); | |
abc0446a MD |
837 | WARN_ON_ONCE(!chan->sc_unknown); |
838 | if (IS_ERR(chan->sc_unknown)) { | |
839 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
840 | } |
841 | } | |
842 | ||
b76dc1a0 | 843 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 844 | const struct lttng_event_desc *desc = |
d4291869 | 845 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
846 | |
847 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
848 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
849 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
850 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
851 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 MD |
852 | desc, |
853 | ev.instrumentation); | |
abc0446a MD |
854 | WARN_ON_ONCE(!chan->sc_unknown); |
855 | if (IS_ERR(chan->sc_compat_unknown)) { | |
856 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
857 | } |
858 | } | |
859 | ||
5b7ac358 | 860 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 861 | const struct lttng_event_desc *desc = |
5b7ac358 | 862 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
863 | |
864 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
865 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
866 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
867 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
868 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, | |
3c997079 MD |
869 | filter, desc, |
870 | ev.instrumentation); | |
5b7ac358 MD |
871 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
872 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
873 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
874 | } | |
875 | } | |
876 | ||
877 | if (!chan->sc_exit_unknown) { | |
878 | const struct lttng_event_desc *desc = | |
879 | &__event_desc___syscall_exit_unknown; | |
880 | ||
881 | memset(&ev, 0, sizeof(ev)); | |
882 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
883 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c MD |
884 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
885 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 886 | desc, ev.instrumentation); |
5b7ac358 MD |
887 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
888 | if (IS_ERR(chan->sc_exit_unknown)) { | |
889 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
890 | } |
891 | } | |
892 | ||
63629d86 | 893 | ret = fill_event_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
894 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
895 | if (ret) | |
896 | return ret; | |
63629d86 | 897 | ret = fill_event_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), |
5b7ac358 | 898 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); |
49c50022 MD |
899 | if (ret) |
900 | return ret; | |
5b7ac358 | 901 | |
49c50022 | 902 | #ifdef CONFIG_COMPAT |
63629d86 | 903 | ret = fill_event_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
904 | chan->compat_sc_table, chan, filter, |
905 | SC_TYPE_COMPAT_ENTRY); | |
906 | if (ret) | |
907 | return ret; | |
63629d86 | 908 | ret = fill_event_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
5b7ac358 MD |
909 | chan->compat_sc_exit_table, chan, filter, |
910 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
911 | if (ret) |
912 | return ret; | |
913 | #endif | |
80f87dd2 MD |
914 | if (!chan->sys_enter_registered) { |
915 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
63629d86 | 916 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
917 | if (ret) |
918 | return ret; | |
919 | chan->sys_enter_registered = 1; | |
920 | } | |
63728b02 MD |
921 | /* |
922 | * We change the name of sys_exit tracepoint due to namespace | |
923 | * conflict with sys_exit syscall entry. | |
924 | */ | |
80f87dd2 MD |
925 | if (!chan->sys_exit_registered) { |
926 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
63629d86 | 927 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
928 | if (ret) { |
929 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
63629d86 | 930 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
931 | return ret; |
932 | } | |
933 | chan->sys_exit_registered = 1; | |
63728b02 | 934 | } |
259b6cb3 MD |
935 | return ret; |
936 | } | |
937 | ||
938 | /* | |
63629d86 FD |
939 | * Should be called with sessions lock held. |
940 | */ | |
941 | int lttng_syscalls_register_trigger(struct lttng_trigger_enabler *trigger_enabler, void *filter) | |
942 | { | |
943 | struct lttng_trigger_group *group = trigger_enabler->group; | |
944 | unsigned int i; | |
945 | int ret = 0; | |
946 | ||
947 | wrapper_vmalloc_sync_all(); | |
948 | ||
949 | if (!group->trigger_syscall_dispatch) { | |
950 | group->trigger_syscall_dispatch = kzalloc(sizeof(struct list_head) | |
951 | * ARRAY_SIZE(sc_table), GFP_KERNEL); | |
952 | if (!group->trigger_syscall_dispatch) | |
953 | return -ENOMEM; | |
954 | ||
955 | /* Initialize all list_head */ | |
956 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) | |
957 | INIT_LIST_HEAD(&group->trigger_syscall_dispatch[i]); | |
958 | } | |
959 | ||
960 | #ifdef CONFIG_COMPAT | |
961 | if (!group->trigger_compat_syscall_dispatch) { | |
962 | group->trigger_compat_syscall_dispatch = kzalloc(sizeof(struct list_head) | |
963 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); | |
964 | if (!group->trigger_syscall_dispatch) | |
965 | return -ENOMEM; | |
966 | ||
967 | /* Initialize all list_head */ | |
968 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) | |
969 | INIT_LIST_HEAD(&group->trigger_compat_syscall_dispatch[i]); | |
970 | } | |
971 | #endif | |
972 | ||
973 | if (!group->sys_enter_registered) { | |
974 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
975 | (void *) syscall_entry_trigger_probe, group); | |
976 | if (ret) | |
977 | return ret; | |
978 | group->sys_enter_registered = 1; | |
979 | } | |
980 | ||
981 | return ret; | |
982 | } | |
983 | ||
984 | static int create_matching_triggers(struct lttng_trigger_enabler *trigger_enabler, | |
985 | void *filter, const struct trace_syscall_entry *table, | |
986 | size_t table_len, bool is_compat) | |
987 | { | |
988 | struct lttng_trigger_group *group = trigger_enabler->group; | |
989 | const struct lttng_event_desc *desc; | |
990 | uint64_t id = trigger_enabler->id; | |
991 | unsigned int i; | |
992 | int ret = 0; | |
993 | ||
994 | /* iterate over all syscall and create trigger that match */ | |
995 | for (i = 0; i < table_len; i++) { | |
996 | struct lttng_trigger *trigger; | |
997 | struct lttng_kernel_trigger trigger_param; | |
998 | struct hlist_head *head; | |
999 | int found = 0; | |
1000 | ||
1001 | desc = table[i].desc; | |
1002 | if (!desc) { | |
1003 | /* Unknown syscall */ | |
1004 | continue; | |
1005 | } | |
1006 | ||
1007 | if (!lttng_desc_match_enabler(desc, | |
1008 | lttng_trigger_enabler_as_enabler(trigger_enabler))) | |
1009 | continue; | |
1010 | ||
1011 | /* | |
1012 | * Check if already created. | |
1013 | */ | |
1014 | head = utils_borrow_hash_table_bucket(group->triggers_ht.table, | |
1015 | LTTNG_TRIGGER_HT_SIZE, desc->name); | |
1016 | lttng_hlist_for_each_entry(trigger, head, hlist) { | |
1017 | if (trigger->desc == desc | |
1018 | && trigger->id == trigger_enabler->id) | |
1019 | found = 1; | |
1020 | } | |
1021 | if (found) | |
1022 | continue; | |
1023 | ||
1024 | memset(&trigger_param, 0, sizeof(trigger_param)); | |
1025 | strncat(trigger_param.name, desc->name, | |
1026 | LTTNG_KERNEL_SYM_NAME_LEN - strlen(trigger_param.name) - 1); | |
1027 | trigger_param.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
1028 | trigger_param.instrumentation = LTTNG_KERNEL_SYSCALL; | |
1029 | ||
1030 | trigger = _lttng_trigger_create(desc, id, group, | |
1031 | &trigger_param, filter, trigger_param.instrumentation); | |
1032 | if (IS_ERR(trigger)) { | |
1033 | printk(KERN_INFO "Unable to create trigger %s\n", | |
1034 | desc->name); | |
1035 | ret = -ENOMEM; | |
1036 | goto end; | |
1037 | } | |
1038 | ||
1039 | trigger->u.syscall.syscall_id = i; | |
1040 | trigger->u.syscall.is_compat = is_compat; | |
1041 | } | |
1042 | end: | |
1043 | return ret; | |
1044 | ||
1045 | } | |
1046 | ||
1047 | int lttng_syscals_create_matching_triggers(struct lttng_trigger_enabler *trigger_enabler, void *filter) | |
1048 | { | |
1049 | int ret; | |
1050 | ||
1051 | ret = create_matching_triggers(trigger_enabler, filter, sc_table, | |
1052 | ARRAY_SIZE(sc_table), false); | |
1053 | if (ret) | |
1054 | goto end; | |
1055 | ||
1056 | ret = create_matching_triggers(trigger_enabler, filter, compat_sc_table, | |
1057 | ARRAY_SIZE(compat_sc_table), true); | |
1058 | end: | |
1059 | return ret; | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * TODO | |
259b6cb3 | 1064 | */ |
63629d86 FD |
1065 | int lttng_syscalls_unregister_trigger(struct lttng_trigger_group *trigger_group) |
1066 | { | |
1067 | int ret; | |
1068 | ||
1069 | if (trigger_group->sys_enter_registered) { | |
1070 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1071 | (void *) syscall_entry_trigger_probe, trigger_group); | |
1072 | if (ret) | |
1073 | return ret; | |
1074 | trigger_group->sys_enter_registered = 0; | |
1075 | } | |
1076 | ||
1077 | kfree(trigger_group->trigger_syscall_dispatch); | |
1078 | #ifdef CONFIG_COMPAT | |
1079 | kfree(trigger_group->trigger_compat_syscall_dispatch); | |
1080 | #endif | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | int lttng_syscalls_unregister_event(struct lttng_channel *chan) | |
259b6cb3 MD |
1085 | { |
1086 | int ret; | |
1087 | ||
1088 | if (!chan->sc_table) | |
1089 | return 0; | |
80f87dd2 | 1090 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1091 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
63629d86 | 1092 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1093 | if (ret) |
1094 | return ret; | |
1095 | chan->sys_enter_registered = 0; | |
1096 | } | |
1097 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1098 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
63629d86 | 1099 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1100 | if (ret) |
1101 | return ret; | |
1102 | chan->sys_exit_registered = 0; | |
1103 | } | |
a90917c3 | 1104 | /* lttng_event destroy will be performed by lttng_session_destroy() */ |
259b6cb3 | 1105 | kfree(chan->sc_table); |
5b7ac358 | 1106 | kfree(chan->sc_exit_table); |
49c50022 MD |
1107 | #ifdef CONFIG_COMPAT |
1108 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1109 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1110 | #endif |
80f87dd2 MD |
1111 | kfree(chan->sc_filter); |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | static | |
1116 | int get_syscall_nr(const char *syscall_name) | |
1117 | { | |
1118 | int syscall_nr = -1; | |
1119 | int i; | |
1120 | ||
1121 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
1122 | const struct trace_syscall_entry *entry; | |
1123 | ||
1124 | entry = &sc_table[i]; | |
1125 | if (!entry->desc) | |
1126 | continue; | |
63629d86 FD |
1127 | |
1128 | if (!strcmp(syscall_name, entry->desc->name)) { | |
80f87dd2 MD |
1129 | syscall_nr = i; |
1130 | break; | |
1131 | } | |
1132 | } | |
1133 | return syscall_nr; | |
1134 | } | |
1135 | ||
1136 | static | |
1137 | int get_compat_syscall_nr(const char *syscall_name) | |
1138 | { | |
1139 | int syscall_nr = -1; | |
1140 | int i; | |
1141 | ||
1142 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
1143 | const struct trace_syscall_entry *entry; | |
1144 | ||
1145 | entry = &compat_sc_table[i]; | |
1146 | if (!entry->desc) | |
1147 | continue; | |
63629d86 FD |
1148 | |
1149 | if (!strcmp(syscall_name, entry->desc->name)) { | |
80f87dd2 MD |
1150 | syscall_nr = i; |
1151 | break; | |
1152 | } | |
1153 | } | |
1154 | return syscall_nr; | |
1155 | } | |
1156 | ||
12e579db MD |
1157 | static |
1158 | uint32_t get_sc_tables_len(void) | |
1159 | { | |
1160 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1161 | } | |
1162 | ||
63629d86 | 1163 | int lttng_syscall_filter_enable_event(struct lttng_channel *chan, |
80f87dd2 MD |
1164 | const char *name) |
1165 | { | |
1166 | int syscall_nr, compat_syscall_nr, ret; | |
1167 | struct lttng_syscall_filter *filter; | |
1168 | ||
1169 | WARN_ON_ONCE(!chan->sc_table); | |
1170 | ||
1171 | if (!name) { | |
1172 | /* Enable all system calls by removing filter */ | |
1173 | if (chan->sc_filter) { | |
1174 | filter = chan->sc_filter; | |
1175 | rcu_assign_pointer(chan->sc_filter, NULL); | |
1176 | synchronize_trace(); | |
1177 | kfree(filter); | |
1178 | } | |
1179 | chan->syscall_all = 1; | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | if (!chan->sc_filter) { | |
1184 | if (chan->syscall_all) { | |
1185 | /* | |
1186 | * All syscalls are already enabled. | |
1187 | */ | |
1188 | return -EEXIST; | |
1189 | } | |
1190 | filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
1191 | GFP_KERNEL); | |
1192 | if (!filter) | |
1193 | return -ENOMEM; | |
1194 | } else { | |
1195 | filter = chan->sc_filter; | |
1196 | } | |
1197 | syscall_nr = get_syscall_nr(name); | |
1198 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1199 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1200 | ret = -ENOENT; | |
1201 | goto error; | |
1202 | } | |
1203 | if (syscall_nr >= 0) { | |
1204 | if (test_bit(syscall_nr, filter->sc)) { | |
1205 | ret = -EEXIST; | |
1206 | goto error; | |
1207 | } | |
1208 | bitmap_set(filter->sc, syscall_nr, 1); | |
1209 | } | |
1210 | if (compat_syscall_nr >= 0) { | |
1211 | if (test_bit(compat_syscall_nr, filter->sc_compat)) { | |
1212 | ret = -EEXIST; | |
1213 | goto error; | |
1214 | } | |
1215 | bitmap_set(filter->sc_compat, compat_syscall_nr, 1); | |
1216 | } | |
1217 | if (!chan->sc_filter) | |
1218 | rcu_assign_pointer(chan->sc_filter, filter); | |
1219 | return 0; | |
1220 | ||
1221 | error: | |
1222 | if (!chan->sc_filter) | |
1223 | kfree(filter); | |
1224 | return ret; | |
1225 | } | |
1226 | ||
63629d86 FD |
1227 | int lttng_syscall_filter_enable_trigger(struct lttng_trigger *trigger) |
1228 | { | |
1229 | struct lttng_trigger_group *group = trigger->group; | |
1230 | unsigned int syscall_id = trigger->u.syscall.syscall_id; | |
1231 | struct list_head *dispatch_list; | |
1232 | ||
1233 | if (trigger->u.syscall.is_compat) | |
1234 | dispatch_list = &group->trigger_compat_syscall_dispatch[syscall_id]; | |
1235 | else | |
1236 | dispatch_list = &group->trigger_syscall_dispatch[syscall_id]; | |
1237 | ||
1238 | list_add_rcu(&trigger->u.syscall.node, dispatch_list); | |
1239 | ||
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | int lttng_syscall_filter_disable_event(struct lttng_channel *chan, | |
80f87dd2 MD |
1244 | const char *name) |
1245 | { | |
1246 | int syscall_nr, compat_syscall_nr, ret; | |
1247 | struct lttng_syscall_filter *filter; | |
1248 | ||
1249 | WARN_ON_ONCE(!chan->sc_table); | |
1250 | ||
1251 | if (!chan->sc_filter) { | |
bcde0d5b MD |
1252 | if (!chan->syscall_all) |
1253 | return -EEXIST; | |
80f87dd2 MD |
1254 | filter = kzalloc(sizeof(struct lttng_syscall_filter), |
1255 | GFP_KERNEL); | |
1256 | if (!filter) | |
1257 | return -ENOMEM; | |
1258 | /* Trace all system calls, then apply disable. */ | |
1259 | bitmap_set(filter->sc, 0, NR_syscalls); | |
1260 | bitmap_set(filter->sc_compat, 0, NR_compat_syscalls); | |
1261 | } else { | |
1262 | filter = chan->sc_filter; | |
1263 | } | |
1264 | ||
72814741 | 1265 | if (!name) { |
404e87bf MD |
1266 | /* Fail if all syscalls are already disabled. */ |
1267 | if (bitmap_empty(filter->sc, NR_syscalls) | |
1268 | && bitmap_empty(filter->sc_compat, | |
1269 | NR_compat_syscalls)) { | |
1270 | ret = -EEXIST; | |
1271 | goto error; | |
1272 | } | |
1273 | ||
72814741 MD |
1274 | /* Disable all system calls */ |
1275 | bitmap_clear(filter->sc, 0, NR_syscalls); | |
1276 | bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls); | |
1277 | goto apply_filter; | |
1278 | } | |
80f87dd2 MD |
1279 | syscall_nr = get_syscall_nr(name); |
1280 | compat_syscall_nr = get_compat_syscall_nr(name); | |
1281 | if (syscall_nr < 0 && compat_syscall_nr < 0) { | |
1282 | ret = -ENOENT; | |
1283 | goto error; | |
1284 | } | |
1285 | if (syscall_nr >= 0) { | |
cecef7f8 | 1286 | if (!test_bit(syscall_nr, filter->sc)) { |
80f87dd2 MD |
1287 | ret = -EEXIST; |
1288 | goto error; | |
1289 | } | |
cecef7f8 | 1290 | bitmap_clear(filter->sc, syscall_nr, 1); |
80f87dd2 MD |
1291 | } |
1292 | if (compat_syscall_nr >= 0) { | |
cecef7f8 | 1293 | if (!test_bit(compat_syscall_nr, filter->sc_compat)) { |
80f87dd2 MD |
1294 | ret = -EEXIST; |
1295 | goto error; | |
1296 | } | |
cecef7f8 | 1297 | bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); |
80f87dd2 | 1298 | } |
72814741 | 1299 | apply_filter: |
80f87dd2 MD |
1300 | if (!chan->sc_filter) |
1301 | rcu_assign_pointer(chan->sc_filter, filter); | |
1302 | chan->syscall_all = 0; | |
259b6cb3 | 1303 | return 0; |
80f87dd2 MD |
1304 | |
1305 | error: | |
1306 | if (!chan->sc_filter) | |
1307 | kfree(filter); | |
1308 | return ret; | |
259b6cb3 | 1309 | } |
2d2464bd | 1310 | |
63629d86 FD |
1311 | int lttng_syscall_filter_disable_trigger(struct lttng_trigger *trigger) |
1312 | { | |
1313 | list_del_rcu(&trigger->u.syscall.node); | |
1314 | return 0; | |
1315 | } | |
1316 | ||
2d2464bd MD |
1317 | static |
1318 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1319 | { | |
1320 | const struct trace_syscall_entry *entry; | |
1321 | int iter = 0; | |
1322 | ||
1323 | for (entry = sc_table; | |
1324 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1325 | entry++) { | |
1326 | if (iter++ >= *pos) | |
1327 | return entry; | |
1328 | } | |
1329 | for (entry = compat_sc_table; | |
1330 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1331 | entry++) { | |
1332 | if (iter++ >= *pos) | |
1333 | return entry; | |
1334 | } | |
1335 | /* End of list */ | |
1336 | return NULL; | |
1337 | } | |
1338 | ||
1339 | static | |
1340 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1341 | { | |
1342 | return (void *) syscall_list_get_entry(pos); | |
1343 | } | |
1344 | ||
1345 | static | |
1346 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1347 | { | |
1348 | (*ppos)++; | |
1349 | return (void *) syscall_list_get_entry(ppos); | |
1350 | } | |
1351 | ||
1352 | static | |
1353 | void syscall_list_stop(struct seq_file *m, void *p) | |
1354 | { | |
1355 | } | |
1356 | ||
12e579db MD |
1357 | static |
1358 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1359 | const struct trace_syscall_entry **table, | |
1360 | unsigned int *bitness) | |
1361 | { | |
1362 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1363 | if (bitness) | |
1364 | *bitness = BITS_PER_LONG; | |
1365 | if (table) | |
1366 | *table = sc_table; | |
1367 | return 0; | |
1368 | } | |
1369 | if (!(entry >= compat_sc_table | |
1370 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1371 | return -EINVAL; | |
1372 | } | |
1373 | if (bitness) | |
1374 | *bitness = 32; | |
1375 | if (table) | |
1376 | *table = compat_sc_table; | |
1377 | return 0; | |
1378 | } | |
1379 | ||
2d2464bd MD |
1380 | static |
1381 | int syscall_list_show(struct seq_file *m, void *p) | |
1382 | { | |
1383 | const struct trace_syscall_entry *table, *entry = p; | |
1384 | unsigned int bitness; | |
d4291869 | 1385 | unsigned long index; |
12e579db | 1386 | int ret; |
d4291869 | 1387 | const char *name; |
2d2464bd | 1388 | |
12e579db MD |
1389 | ret = get_sc_table(entry, &table, &bitness); |
1390 | if (ret) | |
1391 | return ret; | |
f4855b46 MD |
1392 | if (!entry->desc) |
1393 | return 0; | |
d4291869 MD |
1394 | if (table == sc_table) { |
1395 | index = entry - table; | |
1396 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1397 | } else { | |
1398 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1399 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1400 | } | |
12e579db | 1401 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1402 | index, name, bitness); |
2d2464bd MD |
1403 | return 0; |
1404 | } | |
1405 | ||
1406 | static | |
1407 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1408 | .start = syscall_list_start, | |
1409 | .next = syscall_list_next, | |
1410 | .stop = syscall_list_stop, | |
1411 | .show = syscall_list_show, | |
1412 | }; | |
1413 | ||
1414 | static | |
1415 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1416 | { | |
1417 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1418 | } | |
1419 | ||
1420 | const struct file_operations lttng_syscall_list_fops = { | |
1421 | .owner = THIS_MODULE, | |
1422 | .open = lttng_syscall_list_open, | |
1423 | .read = seq_read, | |
1424 | .llseek = seq_lseek, | |
1425 | .release = seq_release, | |
1426 | }; | |
12e579db MD |
1427 | |
1428 | long lttng_channel_syscall_mask(struct lttng_channel *channel, | |
1429 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1430 | { | |
1431 | uint32_t len, sc_tables_len, bitmask_len; | |
1432 | int ret = 0, bit; | |
1433 | char *tmp_mask; | |
1434 | struct lttng_syscall_filter *filter; | |
1435 | ||
1436 | ret = get_user(len, &usyscall_mask->len); | |
1437 | if (ret) | |
1438 | return ret; | |
1439 | sc_tables_len = get_sc_tables_len(); | |
1440 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1441 | if (len < sc_tables_len) { | |
1442 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1443 | } | |
1444 | /* Array is large enough, we can copy array to user-space. */ | |
1445 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1446 | if (!tmp_mask) | |
1447 | return -ENOMEM; | |
1448 | filter = channel->sc_filter; | |
1449 | ||
1450 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1451 | char state; |
2f25059d MD |
1452 | |
1453 | if (channel->sc_table) { | |
1454 | if (filter) | |
1455 | state = test_bit(bit, filter->sc); | |
1456 | else | |
1457 | state = 1; | |
1458 | } else { | |
1459 | state = 0; | |
1460 | } | |
1461 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1462 | } |
1463 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1464 | char state; |
2f25059d MD |
1465 | |
1466 | if (channel->compat_sc_table) { | |
1467 | if (filter) | |
1468 | state = test_bit(bit - ARRAY_SIZE(sc_table), | |
1469 | filter->sc_compat); | |
1470 | else | |
1471 | state = 1; | |
1472 | } else { | |
1473 | state = 0; | |
1474 | } | |
1475 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1476 | } |
1477 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1478 | ret = -EFAULT; | |
1479 | kfree(tmp_mask); | |
1480 | return ret; | |
1481 | } | |
082d4946 MD |
1482 | |
1483 | int lttng_abi_syscall_list(void) | |
1484 | { | |
1485 | struct file *syscall_list_file; | |
1486 | int file_fd, ret; | |
1487 | ||
4ac10b76 | 1488 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1489 | if (file_fd < 0) { |
1490 | ret = file_fd; | |
1491 | goto fd_error; | |
1492 | } | |
1493 | ||
1494 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1495 | <tng_syscall_list_fops, | |
1496 | NULL, O_RDWR); | |
1497 | if (IS_ERR(syscall_list_file)) { | |
1498 | ret = PTR_ERR(syscall_list_file); | |
1499 | goto file_error; | |
1500 | } | |
1501 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1502 | if (ret < 0) | |
1503 | goto open_error; | |
1504 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1505 | return file_fd; |
1506 | ||
1507 | open_error: | |
1508 | fput(syscall_list_file); | |
1509 | file_error: | |
1510 | put_unused_fd(file_fd); | |
1511 | fd_error: | |
1512 | return ret; | |
1513 | } |