Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 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> | |
c8dfb724 | 21 | #include <linux/fcntl.h> |
3cf55950 | 22 | #include <linux/mman.h> |
259b6cb3 MD |
23 | #include <asm/ptrace.h> |
24 | #include <asm/syscall.h> | |
25 | ||
a071f25d | 26 | #include <lttng/bitfield.h> |
241ae9a8 MD |
27 | #include <wrapper/tracepoint.h> |
28 | #include <wrapper/file.h> | |
29 | #include <wrapper/rcu.h> | |
1b7b9c65 | 30 | #include <wrapper/syscall.h> |
2df37e95 | 31 | #include <lttng/events.h> |
259b6cb3 | 32 | |
6333ace3 | 33 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
34 | # ifndef is_compat_task |
35 | # define is_compat_task() (0) | |
36 | # endif | |
6333ace3 MD |
37 | #endif |
38 | ||
1aa3298b MD |
39 | /* in_compat_syscall appears in kernel 4.6. */ |
40 | #ifndef in_compat_syscall | |
41 | #define in_compat_syscall() is_compat_task() | |
42 | #endif | |
43 | ||
5b7ac358 MD |
44 | enum sc_type { |
45 | SC_TYPE_ENTRY, | |
46 | SC_TYPE_EXIT, | |
47 | SC_TYPE_COMPAT_ENTRY, | |
48 | SC_TYPE_COMPAT_EXIT, | |
49 | }; | |
50 | ||
d4291869 MD |
51 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
52 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
53 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
54 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
55 | ||
56 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
57 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
58 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
59 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 60 | |
a93244f8 | 61 | static |
2d6d88c6 | 62 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 | 63 | static |
2d6d88c6 | 64 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 65 | |
3a523f5b MD |
66 | /* |
67 | * Forward declarations for old kernels. | |
68 | */ | |
69 | struct mmsghdr; | |
70 | struct rlimit64; | |
71 | struct oldold_utsname; | |
72 | struct old_utsname; | |
73 | struct sel_arg_struct; | |
74 | struct mmap_arg_struct; | |
c0b71117 | 75 | struct file_handle; |
a292e6f1 | 76 | struct user_msghdr; |
3a523f5b | 77 | |
9eb15e8b MJ |
78 | /* |
79 | * Forward declaration for kernels >= 5.6 | |
80 | */ | |
81 | struct timex; | |
edfdcb68 MJ |
82 | struct timeval; |
83 | struct itimerval; | |
84 | struct itimerspec; | |
85 | ||
86 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) | |
87 | typedef __kernel_old_time_t time_t; | |
88 | #endif | |
9eb15e8b | 89 | |
80f87dd2 MD |
90 | #ifdef IA32_NR_syscalls |
91 | #define NR_compat_syscalls IA32_NR_syscalls | |
92 | #else | |
93 | #define NR_compat_syscalls NR_syscalls | |
94 | #endif | |
95 | ||
259b6cb3 MD |
96 | /* |
97 | * Create LTTng tracepoint probes. | |
98 | */ | |
99 | #define LTTNG_PACKAGE_BUILD | |
100 | #define CREATE_TRACE_POINTS | |
2655f9ad | 101 | #define TP_MODULE_NOINIT |
c075712b | 102 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 103 | |
a93244f8 MD |
104 | #define PARAMS(args...) args |
105 | ||
5b7ac358 | 106 | /* Handle unknown syscalls */ |
72a52753 | 107 | #undef TRACE_SYSTEM |
5b7ac358 | 108 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 109 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
110 | #undef TRACE_SYSTEM |
111 | ||
fc4f7161 MD |
112 | #define SC_ENTER |
113 | ||
fc4f7161 MD |
114 | #undef sc_exit |
115 | #define sc_exit(...) | |
b75d00c4 MD |
116 | #undef sc_in |
117 | #define sc_in(...) __VA_ARGS__ | |
118 | #undef sc_out | |
119 | #define sc_out(...) | |
120 | #undef sc_inout | |
121 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
122 | |
123 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 124 | #undef TP_PROBE_CB |
2d6d88c6 | 125 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
57ede728 | 126 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 127 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 128 | PARAMS(_fields)) |
265822ae | 129 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 130 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
131 | PARAMS(_locvar), PARAMS(_code_pre), \ |
132 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
133 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
134 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 135 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 136 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
137 | /* Enumerations only defined at first inclusion. */ |
138 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
139 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 140 | #undef TRACE_SYSTEM |
d4291869 | 141 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 142 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 143 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 144 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 145 | #undef TRACE_SYSTEM |
d4291869 | 146 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 147 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 148 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 149 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 150 | #undef TRACE_SYSTEM |
141ddf28 | 151 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
152 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
153 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
154 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
155 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 156 | #undef TP_PROBE_CB |
3bc29f0a MD |
157 | #undef _TRACE_SYSCALLS_INTEGERS_H |
158 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
159 | |
160 | /* Hijack probe callback for compat system call enter */ | |
2d6d88c6 | 161 | #define TP_PROBE_CB(_template) &syscall_entry_event_probe |
771af27e | 162 | #define LTTNG_SC_COMPAT |
57ede728 | 163 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 164 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 165 | PARAMS(_fields)) |
265822ae | 166 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 167 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 168 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
169 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
170 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 171 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
172 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
173 | compat_syscall_entry_##_name) | |
141ddf28 MD |
174 | /* Enumerations only defined at inital inclusion (not here). */ |
175 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 176 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 177 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 178 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
179 | #undef TRACE_INCLUDE_FILE |
180 | #undef TRACE_SYSTEM | |
d4291869 | 181 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 182 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 183 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
184 | #undef TRACE_INCLUDE_FILE |
185 | #undef TRACE_SYSTEM | |
141ddf28 | 186 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
187 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
188 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
189 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
190 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 191 | #undef TP_PROBE_CB |
3bc29f0a MD |
192 | #undef _TRACE_SYSCALLS_INTEGERS_H |
193 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 194 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 195 | |
fc4f7161 MD |
196 | #undef SC_ENTER |
197 | ||
198 | #define SC_EXIT | |
199 | ||
fc4f7161 MD |
200 | #undef sc_exit |
201 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
202 | #undef sc_in |
203 | #define sc_in(...) | |
204 | #undef sc_out | |
205 | #define sc_out(...) __VA_ARGS__ | |
206 | #undef sc_inout | |
207 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
208 | |
209 | /* Hijack probe callback for system call exit */ | |
2d6d88c6 | 210 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
57ede728 | 211 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 212 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 213 | PARAMS(_fields)) |
265822ae | 214 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 215 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 216 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
217 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
218 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
219 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
220 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 221 | syscall_exit_##_name) |
141ddf28 MD |
222 | /* Enumerations only defined at inital inclusion (not here). */ |
223 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
224 | #define TRACE_SYSTEM syscall_exit_integers |
225 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 226 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
227 | #undef TRACE_INCLUDE_FILE |
228 | #undef TRACE_SYSTEM | |
229 | #define TRACE_SYSTEM syscall_exit_pointers | |
230 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 231 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
232 | #undef TRACE_INCLUDE_FILE |
233 | #undef TRACE_SYSTEM | |
141ddf28 | 234 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
235 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
236 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
237 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
238 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 239 | #undef TP_PROBE_CB |
3bc29f0a MD |
240 | #undef _TRACE_SYSCALLS_INTEGERS_H |
241 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
242 | |
243 | ||
244 | /* Hijack probe callback for compat system call exit */ | |
2d6d88c6 | 245 | #define TP_PROBE_CB(_template) &syscall_exit_event_probe |
771af27e | 246 | #define LTTNG_SC_COMPAT |
57ede728 | 247 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 248 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 249 | PARAMS(_fields)) |
265822ae | 250 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 251 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 252 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
253 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
254 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 255 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 256 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 257 | compat_syscall_exit_##_name) |
141ddf28 MD |
258 | /* Enumerations only defined at inital inclusion (not here). */ |
259 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
260 | #define TRACE_SYSTEM compat_syscall_exit_integers |
261 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 262 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 263 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 264 | #undef TRACE_SYSTEM |
5b7ac358 MD |
265 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
266 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 267 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 268 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 269 | #undef TRACE_SYSTEM |
141ddf28 | 270 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
271 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
272 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
273 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
274 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 275 | #undef TP_PROBE_CB |
3bc29f0a MD |
276 | #undef _TRACE_SYSCALLS_INTEGERS_H |
277 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 278 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 279 | |
fc4f7161 | 280 | #undef SC_EXIT |
259b6cb3 | 281 | |
2655f9ad | 282 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
283 | #undef LTTNG_PACKAGE_BUILD |
284 | #undef CREATE_TRACE_POINTS | |
285 | ||
a93244f8 | 286 | struct trace_syscall_entry { |
2d6d88c6 | 287 | void *event_func; |
a93244f8 MD |
288 | const struct lttng_event_desc *desc; |
289 | const struct lttng_event_field *fields; | |
290 | unsigned int nrargs; | |
291 | }; | |
292 | ||
293 | #define CREATE_SYSCALL_TABLE | |
294 | ||
fc4f7161 MD |
295 | #define SC_ENTER |
296 | ||
297 | #undef sc_exit | |
298 | #define sc_exit(...) | |
299 | ||
259b6cb3 | 300 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 301 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 302 | [ _nr ] = { \ |
2d6d88c6 | 303 | .event_func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 304 | .nrargs = (_nrargs), \ |
d4291869 MD |
305 | .fields = __event_fields___syscall_entry_##_template, \ |
306 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
307 | }, |
308 | ||
2d6d88c6 | 309 | /* Event syscall enter tracing table */ |
49c50022 | 310 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
311 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
312 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
313 | }; |
314 | ||
a93244f8 MD |
315 | #undef TRACE_SYSCALL_TABLE |
316 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
317 | [ _nr ] = { \ | |
2d6d88c6 | 318 | .event_func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 319 | .nrargs = (_nrargs), \ |
d4291869 MD |
320 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
321 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
322 | }, |
323 | ||
2d6d88c6 | 324 | /* Event compat syscall enter table */ |
a93244f8 | 325 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
326 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
327 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 328 | }; |
259b6cb3 | 329 | |
fc4f7161 MD |
330 | #undef SC_ENTER |
331 | ||
332 | #define SC_EXIT | |
333 | ||
334 | #undef sc_exit | |
335 | #define sc_exit(...) __VA_ARGS__ | |
336 | ||
5b7ac358 MD |
337 | #undef TRACE_SYSCALL_TABLE |
338 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
339 | [ _nr ] = { \ | |
2d6d88c6 | 340 | .event_func = __event_probe__syscall_exit_##_template, \ |
5b7ac358 MD |
341 | .nrargs = (_nrargs), \ |
342 | .fields = __event_fields___syscall_exit_##_template, \ | |
343 | .desc = &__event_desc___syscall_exit_##_name, \ | |
344 | }, | |
345 | ||
2d6d88c6 | 346 | /* Event syscall exit table */ |
5b7ac358 | 347 | static const struct trace_syscall_entry sc_exit_table[] = { |
241ae9a8 MD |
348 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
349 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
350 | }; |
351 | ||
352 | #undef TRACE_SYSCALL_TABLE | |
353 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
354 | [ _nr ] = { \ | |
2d6d88c6 | 355 | .event_func = __event_probe__compat_syscall_exit_##_template, \ |
5b7ac358 MD |
356 | .nrargs = (_nrargs), \ |
357 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
358 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
359 | }, | |
360 | ||
2d6d88c6 | 361 | /* Event compat syscall exit table */ |
5b7ac358 | 362 | const struct trace_syscall_entry compat_sc_exit_table[] = { |
241ae9a8 MD |
363 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
364 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
365 | }; |
366 | ||
fc4f7161 MD |
367 | #undef SC_EXIT |
368 | ||
a93244f8 | 369 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 370 | |
80f87dd2 | 371 | struct lttng_syscall_filter { |
badfe9f5 MD |
372 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
373 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
374 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
375 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
376 | }; |
377 | ||
2d6d88c6 | 378 | static void syscall_entry_event_unknown(struct lttng_event *event, |
f405cfce MD |
379 | struct pt_regs *regs, unsigned int id) |
380 | { | |
1b7b9c65 | 381 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 382 | |
1b7b9c65 | 383 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 384 | if (unlikely(in_compat_syscall())) |
d4291869 | 385 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 386 | else |
d4291869 | 387 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
388 | } |
389 | ||
63aa9160 FD |
390 | static __always_inline |
391 | void syscall_entry_call_func(void *func, unsigned int nrargs, void *data, | |
392 | struct pt_regs *regs) | |
259b6cb3 | 393 | { |
63aa9160 | 394 | switch (nrargs) { |
259b6cb3 MD |
395 | case 0: |
396 | { | |
63aa9160 | 397 | void (*fptr)(void *__data) = func; |
259b6cb3 | 398 | |
63aa9160 | 399 | fptr(data); |
259b6cb3 MD |
400 | break; |
401 | } | |
402 | case 1: | |
403 | { | |
63aa9160 | 404 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 405 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 406 | |
1b7b9c65 | 407 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 408 | fptr(data, args[0]); |
259b6cb3 MD |
409 | break; |
410 | } | |
411 | case 2: | |
412 | { | |
413 | void (*fptr)(void *__data, | |
414 | unsigned long arg0, | |
63aa9160 | 415 | unsigned long arg1) = func; |
1b7b9c65 | 416 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 417 | |
1b7b9c65 | 418 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 419 | fptr(data, args[0], args[1]); |
259b6cb3 MD |
420 | break; |
421 | } | |
422 | case 3: | |
423 | { | |
424 | void (*fptr)(void *__data, | |
425 | unsigned long arg0, | |
426 | unsigned long arg1, | |
63aa9160 | 427 | unsigned long arg2) = func; |
1b7b9c65 | 428 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 429 | |
1b7b9c65 | 430 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 431 | fptr(data, args[0], args[1], args[2]); |
259b6cb3 MD |
432 | break; |
433 | } | |
434 | case 4: | |
435 | { | |
436 | void (*fptr)(void *__data, | |
437 | unsigned long arg0, | |
438 | unsigned long arg1, | |
439 | unsigned long arg2, | |
63aa9160 | 440 | unsigned long arg3) = func; |
1b7b9c65 | 441 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 442 | |
1b7b9c65 | 443 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 444 | fptr(data, args[0], args[1], args[2], args[3]); |
259b6cb3 MD |
445 | break; |
446 | } | |
447 | case 5: | |
448 | { | |
449 | void (*fptr)(void *__data, | |
450 | unsigned long arg0, | |
451 | unsigned long arg1, | |
452 | unsigned long arg2, | |
453 | unsigned long arg3, | |
63aa9160 | 454 | unsigned long arg4) = func; |
1b7b9c65 | 455 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 456 | |
1b7b9c65 | 457 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 458 | fptr(data, args[0], args[1], args[2], args[3], args[4]); |
259b6cb3 MD |
459 | break; |
460 | } | |
461 | case 6: | |
462 | { | |
463 | void (*fptr)(void *__data, | |
464 | unsigned long arg0, | |
465 | unsigned long arg1, | |
466 | unsigned long arg2, | |
467 | unsigned long arg3, | |
468 | unsigned long arg4, | |
63aa9160 | 469 | unsigned long arg5) = func; |
1b7b9c65 | 470 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 471 | |
1b7b9c65 | 472 | lttng_syscall_get_arguments(current, regs, args); |
63aa9160 | 473 | fptr(data, args[0], args[1], args[2], |
259b6cb3 MD |
474 | args[3], args[4], args[5]); |
475 | break; | |
476 | } | |
477 | default: | |
478 | break; | |
479 | } | |
480 | } | |
481 | ||
63aa9160 FD |
482 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
483 | { | |
484 | struct lttng_channel *chan = __data; | |
485 | struct lttng_event *event, *unknown_event; | |
486 | const struct trace_syscall_entry *table, *entry; | |
487 | size_t table_len; | |
488 | ||
489 | if (unlikely(in_compat_syscall())) { | |
490 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
491 | ||
492 | if (id < 0 || id >= NR_compat_syscalls | |
493 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_entry))) { | |
494 | /* System call filtered out. */ | |
495 | return; | |
496 | } | |
497 | table = compat_sc_table; | |
498 | table_len = ARRAY_SIZE(compat_sc_table); | |
499 | unknown_event = chan->sc_compat_unknown; | |
500 | } else { | |
501 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
502 | ||
503 | if (id < 0 || id >= NR_syscalls | |
504 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_entry))) { | |
505 | /* System call filtered out. */ | |
506 | return; | |
507 | } | |
508 | table = sc_table; | |
509 | table_len = ARRAY_SIZE(sc_table); | |
510 | unknown_event = chan->sc_unknown; | |
511 | } | |
512 | if (unlikely(id < 0 || id >= table_len)) { | |
513 | syscall_entry_event_unknown(unknown_event, regs, id); | |
514 | return; | |
515 | } | |
516 | if (unlikely(in_compat_syscall())) | |
517 | event = chan->compat_sc_table[id]; | |
518 | else | |
519 | event = chan->sc_table[id]; | |
520 | if (unlikely(!event)) { | |
521 | syscall_entry_event_unknown(unknown_event, regs, id); | |
522 | return; | |
523 | } | |
524 | entry = &table[id]; | |
525 | WARN_ON_ONCE(!entry); | |
526 | syscall_entry_call_func(entry->event_func, entry->nrargs, event, regs); | |
527 | } | |
528 | ||
2d6d88c6 | 529 | static void syscall_exit_event_unknown(struct lttng_event *event, |
74f7b56a | 530 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 531 | { |
1b7b9c65 | 532 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 533 | |
1b7b9c65 | 534 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 535 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
536 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
537 | args); | |
538 | else | |
539 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
540 | } | |
541 | ||
2d6d88c6 | 542 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
5b7ac358 MD |
543 | { |
544 | struct lttng_channel *chan = __data; | |
545 | struct lttng_event *event, *unknown_event; | |
546 | const struct trace_syscall_entry *table, *entry; | |
547 | size_t table_len; | |
548 | long id; | |
549 | ||
550 | id = syscall_get_nr(current, regs); | |
1aa3298b | 551 | if (unlikely(in_compat_syscall())) { |
badfe9f5 MD |
552 | struct lttng_syscall_filter *filter = chan->sc_filter; |
553 | ||
554 | if (id < 0 || id >= NR_compat_syscalls | |
555 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_exit))) { | |
556 | /* System call filtered out. */ | |
557 | return; | |
5b7ac358 MD |
558 | } |
559 | table = compat_sc_exit_table; | |
560 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
561 | unknown_event = chan->compat_sc_exit_unknown; | |
562 | } else { | |
badfe9f5 MD |
563 | struct lttng_syscall_filter *filter = chan->sc_filter; |
564 | ||
565 | if (id < 0 || id >= NR_syscalls | |
566 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_exit))) { | |
567 | /* System call filtered out. */ | |
568 | return; | |
5b7ac358 MD |
569 | } |
570 | table = sc_exit_table; | |
571 | table_len = ARRAY_SIZE(sc_exit_table); | |
572 | unknown_event = chan->sc_exit_unknown; | |
573 | } | |
74f7b56a | 574 | if (unlikely(id < 0 || id >= table_len)) { |
2d6d88c6 | 575 | syscall_exit_event_unknown(unknown_event, regs, id, ret); |
5b7ac358 MD |
576 | return; |
577 | } | |
1aa3298b | 578 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
579 | event = chan->compat_sc_exit_table[id]; |
580 | else | |
581 | event = chan->sc_exit_table[id]; | |
582 | if (unlikely(!event)) { | |
2d6d88c6 | 583 | syscall_exit_event_unknown(unknown_event, regs, id, ret); |
5b7ac358 MD |
584 | return; |
585 | } | |
586 | entry = &table[id]; | |
587 | WARN_ON_ONCE(!entry); | |
588 | ||
589 | switch (entry->nrargs) { | |
590 | case 0: | |
591 | { | |
2d6d88c6 | 592 | void (*fptr)(void *__data, long ret) = entry->event_func; |
5b7ac358 | 593 | |
fc4f7161 | 594 | fptr(event, ret); |
5b7ac358 MD |
595 | break; |
596 | } | |
597 | case 1: | |
598 | { | |
599 | void (*fptr)(void *__data, | |
fc4f7161 | 600 | long ret, |
2d6d88c6 | 601 | unsigned long arg0) = entry->event_func; |
1b7b9c65 | 602 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 603 | |
1b7b9c65 | 604 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 605 | fptr(event, ret, args[0]); |
5b7ac358 MD |
606 | break; |
607 | } | |
608 | case 2: | |
609 | { | |
610 | void (*fptr)(void *__data, | |
fc4f7161 | 611 | long ret, |
5b7ac358 | 612 | unsigned long arg0, |
2d6d88c6 | 613 | unsigned long arg1) = entry->event_func; |
1b7b9c65 | 614 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 615 | |
1b7b9c65 | 616 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 617 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
618 | break; |
619 | } | |
620 | case 3: | |
621 | { | |
622 | void (*fptr)(void *__data, | |
fc4f7161 | 623 | long ret, |
5b7ac358 MD |
624 | unsigned long arg0, |
625 | unsigned long arg1, | |
2d6d88c6 | 626 | unsigned long arg2) = entry->event_func; |
1b7b9c65 | 627 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 628 | |
1b7b9c65 | 629 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 630 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
631 | break; |
632 | } | |
633 | case 4: | |
634 | { | |
635 | void (*fptr)(void *__data, | |
fc4f7161 | 636 | long ret, |
5b7ac358 MD |
637 | unsigned long arg0, |
638 | unsigned long arg1, | |
639 | unsigned long arg2, | |
2d6d88c6 | 640 | unsigned long arg3) = entry->event_func; |
1b7b9c65 | 641 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 642 | |
1b7b9c65 | 643 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 644 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
645 | break; |
646 | } | |
647 | case 5: | |
648 | { | |
649 | void (*fptr)(void *__data, | |
fc4f7161 | 650 | long ret, |
5b7ac358 MD |
651 | unsigned long arg0, |
652 | unsigned long arg1, | |
653 | unsigned long arg2, | |
654 | unsigned long arg3, | |
2d6d88c6 | 655 | unsigned long arg4) = entry->event_func; |
1b7b9c65 | 656 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 657 | |
1b7b9c65 | 658 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 659 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
660 | break; |
661 | } | |
662 | case 6: | |
663 | { | |
664 | void (*fptr)(void *__data, | |
fc4f7161 | 665 | long ret, |
5b7ac358 MD |
666 | unsigned long arg0, |
667 | unsigned long arg1, | |
668 | unsigned long arg2, | |
669 | unsigned long arg3, | |
670 | unsigned long arg4, | |
2d6d88c6 | 671 | unsigned long arg5) = entry->event_func; |
1b7b9c65 | 672 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 673 | |
1b7b9c65 | 674 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 675 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
676 | args[3], args[4], args[5]); |
677 | break; | |
678 | } | |
679 | default: | |
680 | break; | |
681 | } | |
682 | } | |
683 | ||
33a39a3c MD |
684 | /* |
685 | * noinline to diminish caller stack size. | |
686 | * Should be called with sessions lock held. | |
687 | */ | |
49c50022 | 688 | static |
2d6d88c6 | 689 | int fill_event_table(const struct trace_syscall_entry *table, size_t table_len, |
5b7ac358 MD |
690 | struct lttng_event **chan_table, struct lttng_channel *chan, |
691 | void *filter, enum sc_type type) | |
259b6cb3 | 692 | { |
2a0c4816 | 693 | const struct lttng_event_desc *desc; |
259b6cb3 | 694 | unsigned int i; |
49c50022 MD |
695 | |
696 | /* Allocate events for each syscall, insert into table */ | |
697 | for (i = 0; i < table_len; i++) { | |
698 | struct lttng_kernel_event ev; | |
2a0c4816 | 699 | desc = table[i].desc; |
49c50022 MD |
700 | |
701 | if (!desc) { | |
702 | /* Unknown syscall */ | |
703 | continue; | |
704 | } | |
705 | /* | |
706 | * Skip those already populated by previous failed | |
707 | * register for this channel. | |
708 | */ | |
709 | if (chan_table[i]) | |
710 | continue; | |
711 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
712 | switch (type) { |
713 | case SC_TYPE_ENTRY: | |
badfe9f5 MD |
714 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
715 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
716 | break; |
717 | case SC_TYPE_EXIT: | |
badfe9f5 MD |
718 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
719 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
720 | break; |
721 | case SC_TYPE_COMPAT_ENTRY: | |
badfe9f5 MD |
722 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
723 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
724 | break; |
725 | case SC_TYPE_COMPAT_EXIT: | |
badfe9f5 MD |
726 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
727 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
728 | break; |
729 | } | |
092ffe97 | 730 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN - 1); |
f8695253 | 731 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
732 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
733 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 734 | desc, ev.instrumentation); |
abc0446a MD |
735 | WARN_ON_ONCE(!chan_table[i]); |
736 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
737 | /* |
738 | * If something goes wrong in event registration | |
739 | * after the first one, we have no choice but to | |
740 | * leave the previous events in there, until | |
741 | * deleted by session teardown. | |
742 | */ | |
abc0446a | 743 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
744 | } |
745 | } | |
746 | return 0; | |
747 | } | |
748 | ||
33a39a3c MD |
749 | /* |
750 | * Should be called with sessions lock held. | |
751 | */ | |
2d6d88c6 | 752 | int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter) |
49c50022 | 753 | { |
2a0c4816 | 754 | struct lttng_kernel_event ev; |
259b6cb3 MD |
755 | int ret; |
756 | ||
263b6c88 | 757 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
758 | |
759 | if (!chan->sc_table) { | |
760 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 761 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
762 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
763 | if (!chan->sc_table) | |
764 | return -ENOMEM; | |
765 | } | |
5b7ac358 MD |
766 | if (!chan->sc_exit_table) { |
767 | /* create syscall table mapping syscall to events */ | |
768 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
769 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
770 | if (!chan->sc_exit_table) | |
771 | return -ENOMEM; | |
772 | } | |
773 | ||
259b6cb3 | 774 | |
49c50022 MD |
775 | #ifdef CONFIG_COMPAT |
776 | if (!chan->compat_sc_table) { | |
777 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 778 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 779 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
780 | if (!chan->compat_sc_table) |
781 | return -ENOMEM; | |
782 | } | |
5b7ac358 MD |
783 | |
784 | if (!chan->compat_sc_exit_table) { | |
785 | /* create syscall table mapping compat syscall to events */ | |
786 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
787 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
788 | if (!chan->compat_sc_exit_table) | |
789 | return -ENOMEM; | |
790 | } | |
49c50022 | 791 | #endif |
f405cfce | 792 | if (!chan->sc_unknown) { |
f405cfce | 793 | const struct lttng_event_desc *desc = |
d4291869 | 794 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 795 | |
f405cfce | 796 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
797 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
798 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 799 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
800 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
801 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 802 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
803 | desc, |
804 | ev.instrumentation); | |
abc0446a MD |
805 | WARN_ON_ONCE(!chan->sc_unknown); |
806 | if (IS_ERR(chan->sc_unknown)) { | |
807 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
808 | } |
809 | } | |
810 | ||
b76dc1a0 | 811 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 812 | const struct lttng_event_desc *desc = |
d4291869 | 813 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
814 | |
815 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
816 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
817 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 818 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
819 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
820 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 821 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
822 | desc, |
823 | ev.instrumentation); | |
abc0446a MD |
824 | WARN_ON_ONCE(!chan->sc_unknown); |
825 | if (IS_ERR(chan->sc_compat_unknown)) { | |
826 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
827 | } |
828 | } | |
829 | ||
5b7ac358 | 830 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 831 | const struct lttng_event_desc *desc = |
5b7ac358 | 832 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
833 | |
834 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
835 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
836 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 837 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
838 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
839 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 840 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, |
3c997079 MD |
841 | filter, desc, |
842 | ev.instrumentation); | |
5b7ac358 MD |
843 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
844 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
845 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
846 | } | |
847 | } | |
848 | ||
849 | if (!chan->sc_exit_unknown) { | |
850 | const struct lttng_event_desc *desc = | |
851 | &__event_desc___syscall_exit_unknown; | |
852 | ||
853 | memset(&ev, 0, sizeof(ev)); | |
854 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
855 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 856 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
badfe9f5 MD |
857 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
858 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 859 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 | 860 | desc, ev.instrumentation); |
5b7ac358 MD |
861 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
862 | if (IS_ERR(chan->sc_exit_unknown)) { | |
863 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
864 | } |
865 | } | |
866 | ||
2d6d88c6 | 867 | ret = fill_event_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
868 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
869 | if (ret) | |
870 | return ret; | |
2d6d88c6 | 871 | ret = fill_event_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), |
5b7ac358 | 872 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); |
49c50022 MD |
873 | if (ret) |
874 | return ret; | |
5b7ac358 | 875 | |
49c50022 | 876 | #ifdef CONFIG_COMPAT |
2d6d88c6 | 877 | ret = fill_event_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
878 | chan->compat_sc_table, chan, filter, |
879 | SC_TYPE_COMPAT_ENTRY); | |
880 | if (ret) | |
881 | return ret; | |
2d6d88c6 | 882 | ret = fill_event_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), |
5b7ac358 MD |
883 | chan->compat_sc_exit_table, chan, filter, |
884 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
885 | if (ret) |
886 | return ret; | |
887 | #endif | |
badfe9f5 MD |
888 | |
889 | if (!chan->sc_filter) { | |
890 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
891 | GFP_KERNEL); | |
892 | if (!chan->sc_filter) | |
893 | return -ENOMEM; | |
894 | } | |
895 | ||
80f87dd2 MD |
896 | if (!chan->sys_enter_registered) { |
897 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 898 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
899 | if (ret) |
900 | return ret; | |
901 | chan->sys_enter_registered = 1; | |
902 | } | |
63728b02 MD |
903 | /* |
904 | * We change the name of sys_exit tracepoint due to namespace | |
905 | * conflict with sys_exit syscall entry. | |
906 | */ | |
80f87dd2 MD |
907 | if (!chan->sys_exit_registered) { |
908 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 909 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
910 | if (ret) { |
911 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 912 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
913 | return ret; |
914 | } | |
915 | chan->sys_exit_registered = 1; | |
63728b02 | 916 | } |
259b6cb3 MD |
917 | return ret; |
918 | } | |
919 | ||
920 | /* | |
3b783111 | 921 | * Only called at session destruction. |
259b6cb3 | 922 | */ |
2d6d88c6 | 923 | int lttng_syscalls_unregister_event(struct lttng_channel *chan) |
259b6cb3 MD |
924 | { |
925 | int ret; | |
926 | ||
927 | if (!chan->sc_table) | |
928 | return 0; | |
80f87dd2 | 929 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 930 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 931 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
932 | if (ret) |
933 | return ret; | |
934 | chan->sys_enter_registered = 0; | |
935 | } | |
936 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 937 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 938 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
939 | if (ret) |
940 | return ret; | |
941 | chan->sys_exit_registered = 0; | |
942 | } | |
badfe9f5 MD |
943 | return 0; |
944 | } | |
945 | ||
2d6d88c6 | 946 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 947 | { |
259b6cb3 | 948 | kfree(chan->sc_table); |
5b7ac358 | 949 | kfree(chan->sc_exit_table); |
49c50022 MD |
950 | #ifdef CONFIG_COMPAT |
951 | kfree(chan->compat_sc_table); | |
5b7ac358 | 952 | kfree(chan->compat_sc_exit_table); |
49c50022 | 953 | #endif |
80f87dd2 MD |
954 | kfree(chan->sc_filter); |
955 | return 0; | |
956 | } | |
957 | ||
958 | static | |
959 | int get_syscall_nr(const char *syscall_name) | |
960 | { | |
961 | int syscall_nr = -1; | |
962 | int i; | |
963 | ||
964 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
965 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 966 | const char *it_name; |
80f87dd2 MD |
967 | |
968 | entry = &sc_table[i]; | |
969 | if (!entry->desc) | |
970 | continue; | |
5b7ac358 MD |
971 | it_name = entry->desc->name; |
972 | it_name += strlen(SYSCALL_ENTRY_STR); | |
973 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
974 | syscall_nr = i; |
975 | break; | |
976 | } | |
977 | } | |
978 | return syscall_nr; | |
979 | } | |
980 | ||
981 | static | |
982 | int get_compat_syscall_nr(const char *syscall_name) | |
983 | { | |
984 | int syscall_nr = -1; | |
985 | int i; | |
986 | ||
987 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
988 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 989 | const char *it_name; |
80f87dd2 MD |
990 | |
991 | entry = &compat_sc_table[i]; | |
992 | if (!entry->desc) | |
993 | continue; | |
5b7ac358 MD |
994 | it_name = entry->desc->name; |
995 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
996 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
997 | syscall_nr = i; |
998 | break; | |
999 | } | |
1000 | } | |
1001 | return syscall_nr; | |
1002 | } | |
1003 | ||
12e579db MD |
1004 | static |
1005 | uint32_t get_sc_tables_len(void) | |
1006 | { | |
1007 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1008 | } | |
1009 | ||
badfe9f5 | 1010 | static |
ade8a729 FD |
1011 | const char *get_syscall_name(const char *desc_name, |
1012 | enum lttng_syscall_abi abi, | |
1013 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1014 | { |
badfe9f5 | 1015 | size_t prefix_len = 0; |
80f87dd2 | 1016 | |
80f87dd2 | 1017 | |
ade8a729 | 1018 | switch (entryexit) { |
badfe9f5 | 1019 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1020 | switch (abi) { |
badfe9f5 MD |
1021 | case LTTNG_SYSCALL_ABI_NATIVE: |
1022 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1023 | break; | |
1024 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1025 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1026 | break; | |
80f87dd2 | 1027 | } |
badfe9f5 MD |
1028 | break; |
1029 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1030 | switch (abi) { |
badfe9f5 MD |
1031 | case LTTNG_SYSCALL_ABI_NATIVE: |
1032 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1033 | break; | |
1034 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1035 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1036 | break; | |
80f87dd2 | 1037 | } |
badfe9f5 | 1038 | break; |
80f87dd2 | 1039 | } |
badfe9f5 | 1040 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1041 | return desc_name + prefix_len; |
badfe9f5 MD |
1042 | } |
1043 | ||
ade8a729 FD |
1044 | static |
1045 | int lttng_syscall_filter_enable( | |
1046 | struct lttng_syscall_filter *filter, | |
1047 | const char *desc_name, enum lttng_syscall_abi abi, | |
1048 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1049 | { |
badfe9f5 MD |
1050 | const char *syscall_name; |
1051 | unsigned long *bitmap; | |
1052 | int syscall_nr; | |
1053 | ||
ade8a729 | 1054 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1055 | |
ade8a729 | 1056 | switch (abi) { |
badfe9f5 MD |
1057 | case LTTNG_SYSCALL_ABI_NATIVE: |
1058 | syscall_nr = get_syscall_nr(syscall_name); | |
1059 | break; | |
1060 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1061 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1062 | break; | |
1063 | default: | |
1064 | return -EINVAL; | |
80f87dd2 | 1065 | } |
badfe9f5 MD |
1066 | if (syscall_nr < 0) |
1067 | return -ENOENT; | |
1068 | ||
ade8a729 | 1069 | switch (entryexit) { |
badfe9f5 | 1070 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1071 | switch (abi) { |
badfe9f5 MD |
1072 | case LTTNG_SYSCALL_ABI_NATIVE: |
1073 | bitmap = filter->sc_entry; | |
1074 | break; | |
1075 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1076 | bitmap = filter->sc_compat_entry; | |
1077 | break; | |
6d9694d8 MD |
1078 | default: |
1079 | return -EINVAL; | |
80f87dd2 | 1080 | } |
badfe9f5 MD |
1081 | break; |
1082 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1083 | switch (abi) { |
badfe9f5 MD |
1084 | case LTTNG_SYSCALL_ABI_NATIVE: |
1085 | bitmap = filter->sc_exit; | |
1086 | break; | |
1087 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1088 | bitmap = filter->sc_compat_exit; | |
1089 | break; | |
6d9694d8 MD |
1090 | default: |
1091 | return -EINVAL; | |
80f87dd2 | 1092 | } |
badfe9f5 MD |
1093 | break; |
1094 | default: | |
1095 | return -EINVAL; | |
80f87dd2 | 1096 | } |
badfe9f5 MD |
1097 | if (test_bit(syscall_nr, bitmap)) |
1098 | return -EEXIST; | |
1099 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1100 | return 0; |
80f87dd2 MD |
1101 | } |
1102 | ||
ade8a729 FD |
1103 | int lttng_syscall_filter_enable_event( |
1104 | struct lttng_channel *channel, | |
badfe9f5 | 1105 | struct lttng_event *event) |
80f87dd2 | 1106 | { |
ade8a729 FD |
1107 | WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL); |
1108 | ||
1109 | return lttng_syscall_filter_enable(channel->sc_filter, | |
1110 | event->desc->name, event->u.syscall.abi, | |
1111 | event->u.syscall.entryexit); | |
1112 | } | |
1113 | ||
1114 | static | |
1115 | int lttng_syscall_filter_disable( | |
1116 | struct lttng_syscall_filter *filter, | |
1117 | const char *desc_name, enum lttng_syscall_abi abi, | |
1118 | enum lttng_syscall_entryexit entryexit) | |
1119 | { | |
badfe9f5 MD |
1120 | const char *syscall_name; |
1121 | unsigned long *bitmap; | |
1122 | int syscall_nr; | |
80f87dd2 | 1123 | |
ade8a729 | 1124 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1125 | |
ade8a729 | 1126 | switch (abi) { |
badfe9f5 MD |
1127 | case LTTNG_SYSCALL_ABI_NATIVE: |
1128 | syscall_nr = get_syscall_nr(syscall_name); | |
1129 | break; | |
1130 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1131 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1132 | break; | |
1133 | default: | |
1134 | return -EINVAL; | |
80f87dd2 | 1135 | } |
badfe9f5 MD |
1136 | if (syscall_nr < 0) |
1137 | return -ENOENT; | |
80f87dd2 | 1138 | |
ade8a729 | 1139 | switch (entryexit) { |
badfe9f5 | 1140 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1141 | switch (abi) { |
badfe9f5 MD |
1142 | case LTTNG_SYSCALL_ABI_NATIVE: |
1143 | bitmap = filter->sc_entry; | |
1144 | break; | |
1145 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1146 | bitmap = filter->sc_compat_entry; | |
1147 | break; | |
6d9694d8 MD |
1148 | default: |
1149 | return -EINVAL; | |
80f87dd2 | 1150 | } |
badfe9f5 MD |
1151 | break; |
1152 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1153 | switch (abi) { |
badfe9f5 MD |
1154 | case LTTNG_SYSCALL_ABI_NATIVE: |
1155 | bitmap = filter->sc_exit; | |
1156 | break; | |
1157 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1158 | bitmap = filter->sc_compat_exit; | |
1159 | break; | |
6d9694d8 MD |
1160 | default: |
1161 | return -EINVAL; | |
80f87dd2 | 1162 | } |
badfe9f5 MD |
1163 | break; |
1164 | default: | |
1165 | return -EINVAL; | |
80f87dd2 | 1166 | } |
badfe9f5 MD |
1167 | if (!test_bit(syscall_nr, bitmap)) |
1168 | return -EEXIST; | |
1169 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1170 | |
badfe9f5 | 1171 | return 0; |
259b6cb3 | 1172 | } |
2d2464bd | 1173 | |
ade8a729 FD |
1174 | int lttng_syscall_filter_disable_event( |
1175 | struct lttng_channel *channel, | |
1176 | struct lttng_event *event) | |
1177 | { | |
1178 | return lttng_syscall_filter_disable(channel->sc_filter, | |
1179 | event->desc->name, event->u.syscall.abi, | |
1180 | event->u.syscall.entryexit); | |
1181 | } | |
1182 | ||
2d2464bd MD |
1183 | static |
1184 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1185 | { | |
1186 | const struct trace_syscall_entry *entry; | |
1187 | int iter = 0; | |
1188 | ||
1189 | for (entry = sc_table; | |
1190 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1191 | entry++) { | |
1192 | if (iter++ >= *pos) | |
1193 | return entry; | |
1194 | } | |
1195 | for (entry = compat_sc_table; | |
1196 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1197 | entry++) { | |
1198 | if (iter++ >= *pos) | |
1199 | return entry; | |
1200 | } | |
1201 | /* End of list */ | |
1202 | return NULL; | |
1203 | } | |
1204 | ||
1205 | static | |
1206 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1207 | { | |
1208 | return (void *) syscall_list_get_entry(pos); | |
1209 | } | |
1210 | ||
1211 | static | |
1212 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1213 | { | |
1214 | (*ppos)++; | |
1215 | return (void *) syscall_list_get_entry(ppos); | |
1216 | } | |
1217 | ||
1218 | static | |
1219 | void syscall_list_stop(struct seq_file *m, void *p) | |
1220 | { | |
1221 | } | |
1222 | ||
12e579db MD |
1223 | static |
1224 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1225 | const struct trace_syscall_entry **table, | |
1226 | unsigned int *bitness) | |
1227 | { | |
1228 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1229 | if (bitness) | |
1230 | *bitness = BITS_PER_LONG; | |
1231 | if (table) | |
1232 | *table = sc_table; | |
1233 | return 0; | |
1234 | } | |
1235 | if (!(entry >= compat_sc_table | |
1236 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1237 | return -EINVAL; | |
1238 | } | |
1239 | if (bitness) | |
1240 | *bitness = 32; | |
1241 | if (table) | |
1242 | *table = compat_sc_table; | |
1243 | return 0; | |
1244 | } | |
1245 | ||
2d2464bd MD |
1246 | static |
1247 | int syscall_list_show(struct seq_file *m, void *p) | |
1248 | { | |
1249 | const struct trace_syscall_entry *table, *entry = p; | |
1250 | unsigned int bitness; | |
d4291869 | 1251 | unsigned long index; |
12e579db | 1252 | int ret; |
d4291869 | 1253 | const char *name; |
2d2464bd | 1254 | |
12e579db MD |
1255 | ret = get_sc_table(entry, &table, &bitness); |
1256 | if (ret) | |
1257 | return ret; | |
f4855b46 MD |
1258 | if (!entry->desc) |
1259 | return 0; | |
d4291869 MD |
1260 | if (table == sc_table) { |
1261 | index = entry - table; | |
1262 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1263 | } else { | |
1264 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1265 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1266 | } | |
12e579db | 1267 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1268 | index, name, bitness); |
2d2464bd MD |
1269 | return 0; |
1270 | } | |
1271 | ||
1272 | static | |
1273 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1274 | .start = syscall_list_start, | |
1275 | .next = syscall_list_next, | |
1276 | .stop = syscall_list_stop, | |
1277 | .show = syscall_list_show, | |
1278 | }; | |
1279 | ||
1280 | static | |
1281 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1282 | { | |
1283 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1284 | } | |
1285 | ||
1286 | const struct file_operations lttng_syscall_list_fops = { | |
1287 | .owner = THIS_MODULE, | |
1288 | .open = lttng_syscall_list_open, | |
1289 | .read = seq_read, | |
1290 | .llseek = seq_lseek, | |
1291 | .release = seq_release, | |
1292 | }; | |
12e579db | 1293 | |
badfe9f5 MD |
1294 | /* |
1295 | * A syscall is enabled if it is traced for either entry or exit. | |
1296 | */ | |
12e579db MD |
1297 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
1298 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1299 | { | |
1300 | uint32_t len, sc_tables_len, bitmask_len; | |
1301 | int ret = 0, bit; | |
1302 | char *tmp_mask; | |
1303 | struct lttng_syscall_filter *filter; | |
1304 | ||
1305 | ret = get_user(len, &usyscall_mask->len); | |
1306 | if (ret) | |
1307 | return ret; | |
1308 | sc_tables_len = get_sc_tables_len(); | |
1309 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1310 | if (len < sc_tables_len) { | |
1311 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1312 | } | |
1313 | /* Array is large enough, we can copy array to user-space. */ | |
1314 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1315 | if (!tmp_mask) | |
1316 | return -ENOMEM; | |
1317 | filter = channel->sc_filter; | |
1318 | ||
1319 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1320 | char state; |
2f25059d MD |
1321 | |
1322 | if (channel->sc_table) { | |
badfe9f5 MD |
1323 | if (!READ_ONCE(channel->syscall_all) && filter) |
1324 | state = test_bit(bit, filter->sc_entry) | |
1325 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1326 | else |
1327 | state = 1; | |
1328 | } else { | |
1329 | state = 0; | |
1330 | } | |
1331 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1332 | } |
1333 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1334 | char state; |
2f25059d MD |
1335 | |
1336 | if (channel->compat_sc_table) { | |
badfe9f5 | 1337 | if (!READ_ONCE(channel->syscall_all) && filter) |
2f25059d | 1338 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
badfe9f5 MD |
1339 | filter->sc_compat_entry) |
1340 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
1341 | filter->sc_compat_exit); | |
2f25059d MD |
1342 | else |
1343 | state = 1; | |
1344 | } else { | |
1345 | state = 0; | |
1346 | } | |
1347 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1348 | } |
1349 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1350 | ret = -EFAULT; | |
1351 | kfree(tmp_mask); | |
1352 | return ret; | |
1353 | } | |
082d4946 MD |
1354 | |
1355 | int lttng_abi_syscall_list(void) | |
1356 | { | |
1357 | struct file *syscall_list_file; | |
1358 | int file_fd, ret; | |
1359 | ||
4ac10b76 | 1360 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1361 | if (file_fd < 0) { |
1362 | ret = file_fd; | |
1363 | goto fd_error; | |
1364 | } | |
1365 | ||
1366 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1367 | <tng_syscall_list_fops, | |
1368 | NULL, O_RDWR); | |
1369 | if (IS_ERR(syscall_list_file)) { | |
1370 | ret = PTR_ERR(syscall_list_file); | |
1371 | goto file_error; | |
1372 | } | |
1373 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1374 | if (ret < 0) | |
1375 | goto open_error; | |
1376 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1377 | return file_fd; |
1378 | ||
1379 | open_error: | |
1380 | fput(syscall_list_file); | |
1381 | file_error: | |
1382 | put_unused_fd(file_fd); | |
1383 | fd_error: | |
1384 | return ret; | |
1385 | } |