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> |
56bc8397 | 30 | #include <lttng-kernel-version.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 | |
56bc8397 MD |
40 | # define in_compat_syscall() is_compat_task() |
41 | #endif | |
42 | ||
43 | /* in_x32_syscall appears in kernel 4.7. */ | |
44 | #if (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(4,7,0)) | |
45 | # ifdef CONFIG_X86_X32_ABI | |
46 | # define in_x32_syscall() is_x32_task() | |
47 | # endif | |
1aa3298b MD |
48 | #endif |
49 | ||
5b7ac358 MD |
50 | enum sc_type { |
51 | SC_TYPE_ENTRY, | |
52 | SC_TYPE_EXIT, | |
53 | SC_TYPE_COMPAT_ENTRY, | |
54 | SC_TYPE_COMPAT_EXIT, | |
55 | }; | |
56 | ||
d4291869 MD |
57 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
58 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
59 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
60 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
61 | ||
62 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
63 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
64 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
65 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 66 | |
a93244f8 | 67 | static |
2faf7d1b | 68 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id); |
5b7ac358 MD |
69 | static |
70 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); | |
259b6cb3 | 71 | |
3a523f5b MD |
72 | /* |
73 | * Forward declarations for old kernels. | |
74 | */ | |
75 | struct mmsghdr; | |
76 | struct rlimit64; | |
77 | struct oldold_utsname; | |
78 | struct old_utsname; | |
79 | struct sel_arg_struct; | |
80 | struct mmap_arg_struct; | |
c0b71117 | 81 | struct file_handle; |
a292e6f1 | 82 | struct user_msghdr; |
3a523f5b | 83 | |
393f0993 MJ |
84 | /* |
85 | * Forward declaration for kernels >= 5.6 | |
86 | */ | |
87 | struct timex; | |
1c846044 MJ |
88 | struct timeval; |
89 | struct itimerval; | |
90 | struct itimerspec; | |
91 | ||
2d042821 | 92 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
1c846044 MJ |
93 | typedef __kernel_old_time_t time_t; |
94 | #endif | |
393f0993 | 95 | |
80f87dd2 MD |
96 | #ifdef IA32_NR_syscalls |
97 | #define NR_compat_syscalls IA32_NR_syscalls | |
98 | #else | |
99 | #define NR_compat_syscalls NR_syscalls | |
100 | #endif | |
101 | ||
259b6cb3 MD |
102 | /* |
103 | * Create LTTng tracepoint probes. | |
104 | */ | |
105 | #define LTTNG_PACKAGE_BUILD | |
106 | #define CREATE_TRACE_POINTS | |
2655f9ad | 107 | #define TP_MODULE_NOINIT |
c075712b | 108 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 109 | |
a93244f8 MD |
110 | #define PARAMS(args...) args |
111 | ||
5b7ac358 | 112 | /* Handle unknown syscalls */ |
72a52753 | 113 | #undef TRACE_SYSTEM |
5b7ac358 | 114 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 115 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
116 | #undef TRACE_SYSTEM |
117 | ||
fc4f7161 MD |
118 | #define SC_ENTER |
119 | ||
fc4f7161 MD |
120 | #undef sc_exit |
121 | #define sc_exit(...) | |
b75d00c4 MD |
122 | #undef sc_in |
123 | #define sc_in(...) __VA_ARGS__ | |
124 | #undef sc_out | |
125 | #define sc_out(...) | |
126 | #undef sc_inout | |
127 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
128 | |
129 | /* Hijack probe callback for system call enter */ | |
a93244f8 | 130 | #undef TP_PROBE_CB |
259b6cb3 | 131 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
57ede728 | 132 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 133 | LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 134 | PARAMS(_fields)) |
265822ae | 135 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 136 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae MD |
137 | PARAMS(_locvar), PARAMS(_code_pre), \ |
138 | PARAMS(_fields), PARAMS(_code_post)) | |
57ede728 MD |
139 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
140 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 141 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 | 142 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name) |
141ddf28 MD |
143 | /* Enumerations only defined at first inclusion. */ |
144 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \ | |
145 | LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values)) | |
a93244f8 | 146 | #undef TRACE_SYSTEM |
d4291869 | 147 | #define TRACE_SYSTEM syscall_entry_integers |
5b7ac358 | 148 | #define TRACE_INCLUDE_FILE syscalls_integers |
241ae9a8 | 149 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 | 150 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 151 | #undef TRACE_SYSTEM |
d4291869 | 152 | #define TRACE_SYSTEM syscall_entry_pointers |
5b7ac358 | 153 | #define TRACE_INCLUDE_FILE syscalls_pointers |
241ae9a8 | 154 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 | 155 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 156 | #undef TRACE_SYSTEM |
141ddf28 | 157 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
158 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
159 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
160 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
161 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 162 | #undef TP_PROBE_CB |
3bc29f0a MD |
163 | #undef _TRACE_SYSCALLS_INTEGERS_H |
164 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
165 | |
166 | /* Hijack probe callback for compat system call enter */ | |
a93244f8 | 167 | #define TP_PROBE_CB(_template) &syscall_entry_probe |
771af27e | 168 | #define LTTNG_SC_COMPAT |
57ede728 | 169 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
d4291869 | 170 | LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 171 | PARAMS(_fields)) |
265822ae | 172 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
d4291869 | 173 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 174 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
175 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
176 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields)) | |
cb3ef14c | 177 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
d4291869 MD |
178 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \ |
179 | compat_syscall_entry_##_name) | |
141ddf28 MD |
180 | /* Enumerations only defined at inital inclusion (not here). */ |
181 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
d4291869 | 182 | #define TRACE_SYSTEM compat_syscall_entry_integers |
5b7ac358 | 183 | #define TRACE_INCLUDE_FILE compat_syscalls_integers |
241ae9a8 | 184 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 MD |
185 | #undef TRACE_INCLUDE_FILE |
186 | #undef TRACE_SYSTEM | |
d4291869 | 187 | #define TRACE_SYSTEM compat_syscall_entry_pointers |
5b7ac358 | 188 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers |
241ae9a8 | 189 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 MD |
190 | #undef TRACE_INCLUDE_FILE |
191 | #undef TRACE_SYSTEM | |
141ddf28 | 192 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
193 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
194 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
195 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
196 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 197 | #undef TP_PROBE_CB |
3bc29f0a MD |
198 | #undef _TRACE_SYSCALLS_INTEGERS_H |
199 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 200 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 201 | |
fc4f7161 MD |
202 | #undef SC_ENTER |
203 | ||
204 | #define SC_EXIT | |
205 | ||
fc4f7161 MD |
206 | #undef sc_exit |
207 | #define sc_exit(...) __VA_ARGS__ | |
b75d00c4 MD |
208 | #undef sc_in |
209 | #define sc_in(...) | |
210 | #undef sc_out | |
211 | #define sc_out(...) __VA_ARGS__ | |
212 | #undef sc_inout | |
213 | #define sc_inout(...) __VA_ARGS__ | |
5b7ac358 MD |
214 | |
215 | /* Hijack probe callback for system call exit */ | |
216 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
57ede728 | 217 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 218 | LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 219 | PARAMS(_fields)) |
265822ae | 220 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 221 | LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 222 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
223 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
224 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c MD |
225 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
226 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \ | |
5b7ac358 | 227 | syscall_exit_##_name) |
141ddf28 MD |
228 | /* Enumerations only defined at inital inclusion (not here). */ |
229 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
230 | #define TRACE_SYSTEM syscall_exit_integers |
231 | #define TRACE_INCLUDE_FILE syscalls_integers | |
241ae9a8 | 232 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
5b7ac358 MD |
233 | #undef TRACE_INCLUDE_FILE |
234 | #undef TRACE_SYSTEM | |
235 | #define TRACE_SYSTEM syscall_exit_pointers | |
236 | #define TRACE_INCLUDE_FILE syscalls_pointers | |
241ae9a8 | 237 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> |
5b7ac358 MD |
238 | #undef TRACE_INCLUDE_FILE |
239 | #undef TRACE_SYSTEM | |
141ddf28 | 240 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
241 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
242 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
243 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
244 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
5b7ac358 | 245 | #undef TP_PROBE_CB |
3bc29f0a MD |
246 | #undef _TRACE_SYSCALLS_INTEGERS_H |
247 | #undef _TRACE_SYSCALLS_POINTERS_H | |
5b7ac358 MD |
248 | |
249 | ||
250 | /* Hijack probe callback for compat system call exit */ | |
251 | #define TP_PROBE_CB(_template) &syscall_exit_probe | |
771af27e | 252 | #define LTTNG_SC_COMPAT |
57ede728 | 253 | #define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ |
3bc29f0a | 254 | LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
57ede728 | 255 | PARAMS(_fields)) |
265822ae | 256 | #define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \ |
3bc29f0a | 257 | LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \ |
265822ae | 258 | PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post)) |
57ede728 MD |
259 | #define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \ |
260 | LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields)) | |
cb3ef14c | 261 | #define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \ |
3bc29f0a | 262 | LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \ |
5b7ac358 | 263 | compat_syscall_exit_##_name) |
141ddf28 MD |
264 | /* Enumerations only defined at inital inclusion (not here). */ |
265 | #define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) | |
5b7ac358 MD |
266 | #define TRACE_SYSTEM compat_syscall_exit_integers |
267 | #define TRACE_INCLUDE_FILE compat_syscalls_integers | |
241ae9a8 | 268 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
5b7ac358 | 269 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 270 | #undef TRACE_SYSTEM |
5b7ac358 MD |
271 | #define TRACE_SYSTEM compat_syscall_exit_pointers |
272 | #define TRACE_INCLUDE_FILE compat_syscalls_pointers | |
241ae9a8 | 273 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> |
5b7ac358 | 274 | #undef TRACE_INCLUDE_FILE |
a93244f8 | 275 | #undef TRACE_SYSTEM |
141ddf28 | 276 | #undef SC_LTTNG_TRACEPOINT_ENUM |
cb3ef14c MD |
277 | #undef SC_LTTNG_TRACEPOINT_EVENT_CODE |
278 | #undef SC_LTTNG_TRACEPOINT_EVENT | |
279 | #undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS | |
280 | #undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS | |
a93244f8 | 281 | #undef TP_PROBE_CB |
3bc29f0a MD |
282 | #undef _TRACE_SYSCALLS_INTEGERS_H |
283 | #undef _TRACE_SYSCALLS_POINTERS_H | |
771af27e | 284 | #undef LTTNG_SC_COMPAT |
5b7ac358 | 285 | |
fc4f7161 | 286 | #undef SC_EXIT |
259b6cb3 | 287 | |
2655f9ad | 288 | #undef TP_MODULE_NOINIT |
259b6cb3 MD |
289 | #undef LTTNG_PACKAGE_BUILD |
290 | #undef CREATE_TRACE_POINTS | |
291 | ||
a93244f8 MD |
292 | struct trace_syscall_entry { |
293 | void *func; | |
294 | const struct lttng_event_desc *desc; | |
295 | const struct lttng_event_field *fields; | |
296 | unsigned int nrargs; | |
297 | }; | |
298 | ||
299 | #define CREATE_SYSCALL_TABLE | |
300 | ||
fc4f7161 MD |
301 | #define SC_ENTER |
302 | ||
303 | #undef sc_exit | |
304 | #define sc_exit(...) | |
305 | ||
259b6cb3 | 306 | #undef TRACE_SYSCALL_TABLE |
f7bdf4db | 307 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ |
259b6cb3 | 308 | [ _nr ] = { \ |
d4291869 | 309 | .func = __event_probe__syscall_entry_##_template, \ |
259b6cb3 | 310 | .nrargs = (_nrargs), \ |
d4291869 MD |
311 | .fields = __event_fields___syscall_entry_##_template, \ |
312 | .desc = &__event_desc___syscall_entry_##_name, \ | |
259b6cb3 MD |
313 | }, |
314 | ||
5b7ac358 | 315 | /* Syscall enter tracing table */ |
49c50022 | 316 | static const struct trace_syscall_entry sc_table[] = { |
241ae9a8 MD |
317 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
318 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
259b6cb3 MD |
319 | }; |
320 | ||
a93244f8 MD |
321 | #undef TRACE_SYSCALL_TABLE |
322 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
323 | [ _nr ] = { \ | |
d4291869 | 324 | .func = __event_probe__compat_syscall_entry_##_template, \ |
a93244f8 | 325 | .nrargs = (_nrargs), \ |
d4291869 MD |
326 | .fields = __event_fields___compat_syscall_entry_##_template, \ |
327 | .desc = &__event_desc___compat_syscall_entry_##_name, \ | |
a93244f8 MD |
328 | }, |
329 | ||
5b7ac358 | 330 | /* Compat syscall enter table */ |
a93244f8 | 331 | const struct trace_syscall_entry compat_sc_table[] = { |
241ae9a8 MD |
332 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
333 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
a93244f8 | 334 | }; |
259b6cb3 | 335 | |
fc4f7161 MD |
336 | #undef SC_ENTER |
337 | ||
338 | #define SC_EXIT | |
339 | ||
340 | #undef sc_exit | |
341 | #define sc_exit(...) __VA_ARGS__ | |
342 | ||
5b7ac358 MD |
343 | #undef TRACE_SYSCALL_TABLE |
344 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
345 | [ _nr ] = { \ | |
346 | .func = __event_probe__syscall_exit_##_template, \ | |
347 | .nrargs = (_nrargs), \ | |
348 | .fields = __event_fields___syscall_exit_##_template, \ | |
349 | .desc = &__event_desc___syscall_exit_##_name, \ | |
350 | }, | |
351 | ||
352 | /* Syscall exit table */ | |
353 | static const struct trace_syscall_entry sc_exit_table[] = { | |
241ae9a8 MD |
354 | #include <instrumentation/syscalls/headers/syscalls_integers.h> |
355 | #include <instrumentation/syscalls/headers/syscalls_pointers.h> | |
5b7ac358 MD |
356 | }; |
357 | ||
358 | #undef TRACE_SYSCALL_TABLE | |
359 | #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ | |
360 | [ _nr ] = { \ | |
361 | .func = __event_probe__compat_syscall_exit_##_template, \ | |
362 | .nrargs = (_nrargs), \ | |
363 | .fields = __event_fields___compat_syscall_exit_##_template, \ | |
364 | .desc = &__event_desc___compat_syscall_exit_##_name, \ | |
365 | }, | |
366 | ||
367 | /* Compat syscall exit table */ | |
368 | const struct trace_syscall_entry compat_sc_exit_table[] = { | |
241ae9a8 MD |
369 | #include <instrumentation/syscalls/headers/compat_syscalls_integers.h> |
370 | #include <instrumentation/syscalls/headers/compat_syscalls_pointers.h> | |
5b7ac358 MD |
371 | }; |
372 | ||
fc4f7161 MD |
373 | #undef SC_EXIT |
374 | ||
a93244f8 | 375 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 376 | |
80f87dd2 | 377 | struct lttng_syscall_filter { |
ad594e3a MD |
378 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
379 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
380 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
381 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
382 | }; |
383 | ||
a90917c3 | 384 | static void syscall_entry_unknown(struct lttng_event *event, |
f405cfce MD |
385 | struct pt_regs *regs, unsigned int id) |
386 | { | |
1b7b9c65 | 387 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
f405cfce | 388 | |
1b7b9c65 | 389 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 390 | if (unlikely(in_compat_syscall())) |
d4291869 | 391 | __event_probe__compat_syscall_entry_unknown(event, id, args); |
a93244f8 | 392 | else |
d4291869 | 393 | __event_probe__syscall_entry_unknown(event, id, args); |
f405cfce MD |
394 | } |
395 | ||
2faf7d1b | 396 | void syscall_entry_probe(void *__data, struct pt_regs *regs, long id) |
259b6cb3 | 397 | { |
a90917c3 MD |
398 | struct lttng_channel *chan = __data; |
399 | struct lttng_event *event, *unknown_event; | |
49c50022 MD |
400 | const struct trace_syscall_entry *table, *entry; |
401 | size_t table_len; | |
259b6cb3 | 402 | |
f75983c2 MD |
403 | #ifdef CONFIG_X86_X32_ABI |
404 | if (in_x32_syscall()) { | |
405 | /* x32 system calls are not supported. */ | |
406 | return; | |
407 | } | |
408 | #endif | |
1aa3298b | 409 | if (unlikely(in_compat_syscall())) { |
ad594e3a MD |
410 | struct lttng_syscall_filter *filter = chan->sc_filter; |
411 | ||
412 | if (id < 0 || id >= NR_compat_syscalls | |
413 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_entry))) { | |
414 | /* System call filtered out. */ | |
415 | return; | |
80f87dd2 | 416 | } |
49c50022 | 417 | table = compat_sc_table; |
a93244f8 | 418 | table_len = ARRAY_SIZE(compat_sc_table); |
49c50022 MD |
419 | unknown_event = chan->sc_compat_unknown; |
420 | } else { | |
ad594e3a MD |
421 | struct lttng_syscall_filter *filter = chan->sc_filter; |
422 | ||
423 | if (id < 0 || id >= NR_syscalls | |
424 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_entry))) { | |
425 | /* System call filtered out. */ | |
426 | return; | |
80f87dd2 | 427 | } |
49c50022 MD |
428 | table = sc_table; |
429 | table_len = ARRAY_SIZE(sc_table); | |
430 | unknown_event = chan->sc_unknown; | |
b76dc1a0 | 431 | } |
74f7b56a | 432 | if (unlikely(id < 0 || id >= table_len)) { |
49c50022 | 433 | syscall_entry_unknown(unknown_event, regs, id); |
259b6cb3 | 434 | return; |
f405cfce | 435 | } |
1aa3298b | 436 | if (unlikely(in_compat_syscall())) |
49c50022 MD |
437 | event = chan->compat_sc_table[id]; |
438 | else | |
439 | event = chan->sc_table[id]; | |
f405cfce | 440 | if (unlikely(!event)) { |
49c50022 | 441 | syscall_entry_unknown(unknown_event, regs, id); |
f405cfce MD |
442 | return; |
443 | } | |
49c50022 | 444 | entry = &table[id]; |
f405cfce | 445 | WARN_ON_ONCE(!entry); |
259b6cb3 MD |
446 | |
447 | switch (entry->nrargs) { | |
448 | case 0: | |
449 | { | |
450 | void (*fptr)(void *__data) = entry->func; | |
451 | ||
452 | fptr(event); | |
453 | break; | |
454 | } | |
455 | case 1: | |
456 | { | |
457 | void (*fptr)(void *__data, unsigned long arg0) = entry->func; | |
1b7b9c65 | 458 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 459 | |
1b7b9c65 | 460 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
461 | fptr(event, args[0]); |
462 | break; | |
463 | } | |
464 | case 2: | |
465 | { | |
466 | void (*fptr)(void *__data, | |
467 | unsigned long arg0, | |
468 | unsigned long arg1) = entry->func; | |
1b7b9c65 | 469 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 470 | |
1b7b9c65 | 471 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
472 | fptr(event, args[0], args[1]); |
473 | break; | |
474 | } | |
475 | case 3: | |
476 | { | |
477 | void (*fptr)(void *__data, | |
478 | unsigned long arg0, | |
479 | unsigned long arg1, | |
480 | unsigned long arg2) = entry->func; | |
1b7b9c65 | 481 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 482 | |
1b7b9c65 | 483 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
484 | fptr(event, args[0], args[1], args[2]); |
485 | break; | |
486 | } | |
487 | case 4: | |
488 | { | |
489 | void (*fptr)(void *__data, | |
490 | unsigned long arg0, | |
491 | unsigned long arg1, | |
492 | unsigned long arg2, | |
493 | unsigned long arg3) = entry->func; | |
1b7b9c65 | 494 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 495 | |
1b7b9c65 | 496 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
497 | fptr(event, args[0], args[1], args[2], args[3]); |
498 | break; | |
499 | } | |
500 | case 5: | |
501 | { | |
502 | void (*fptr)(void *__data, | |
503 | unsigned long arg0, | |
504 | unsigned long arg1, | |
505 | unsigned long arg2, | |
506 | unsigned long arg3, | |
507 | unsigned long arg4) = entry->func; | |
1b7b9c65 | 508 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 509 | |
1b7b9c65 | 510 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
511 | fptr(event, args[0], args[1], args[2], args[3], args[4]); |
512 | break; | |
513 | } | |
514 | case 6: | |
515 | { | |
516 | void (*fptr)(void *__data, | |
517 | unsigned long arg0, | |
518 | unsigned long arg1, | |
519 | unsigned long arg2, | |
520 | unsigned long arg3, | |
521 | unsigned long arg4, | |
522 | unsigned long arg5) = entry->func; | |
1b7b9c65 | 523 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 524 | |
1b7b9c65 | 525 | lttng_syscall_get_arguments(current, regs, args); |
259b6cb3 MD |
526 | fptr(event, args[0], args[1], args[2], |
527 | args[3], args[4], args[5]); | |
528 | break; | |
529 | } | |
530 | default: | |
531 | break; | |
532 | } | |
533 | } | |
534 | ||
5b7ac358 | 535 | static void syscall_exit_unknown(struct lttng_event *event, |
74f7b56a | 536 | struct pt_regs *regs, int id, long ret) |
5b7ac358 | 537 | { |
1b7b9c65 | 538 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 539 | |
1b7b9c65 | 540 | lttng_syscall_get_arguments(current, regs, args); |
1aa3298b | 541 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
542 | __event_probe__compat_syscall_exit_unknown(event, id, ret, |
543 | args); | |
544 | else | |
545 | __event_probe__syscall_exit_unknown(event, id, ret, args); | |
546 | } | |
547 | ||
548 | void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) | |
549 | { | |
550 | struct lttng_channel *chan = __data; | |
551 | struct lttng_event *event, *unknown_event; | |
552 | const struct trace_syscall_entry *table, *entry; | |
553 | size_t table_len; | |
554 | long id; | |
555 | ||
f75983c2 MD |
556 | #ifdef CONFIG_X86_X32_ABI |
557 | if (in_x32_syscall()) { | |
558 | /* x32 system calls are not supported. */ | |
559 | return; | |
560 | } | |
561 | #endif | |
5b7ac358 | 562 | id = syscall_get_nr(current, regs); |
1aa3298b | 563 | if (unlikely(in_compat_syscall())) { |
ad594e3a MD |
564 | struct lttng_syscall_filter *filter = chan->sc_filter; |
565 | ||
566 | if (id < 0 || id >= NR_compat_syscalls | |
567 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_exit))) { | |
568 | /* System call filtered out. */ | |
569 | return; | |
5b7ac358 MD |
570 | } |
571 | table = compat_sc_exit_table; | |
572 | table_len = ARRAY_SIZE(compat_sc_exit_table); | |
573 | unknown_event = chan->compat_sc_exit_unknown; | |
574 | } else { | |
ad594e3a MD |
575 | struct lttng_syscall_filter *filter = chan->sc_filter; |
576 | ||
577 | if (id < 0 || id >= NR_syscalls | |
578 | || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_exit))) { | |
579 | /* System call filtered out. */ | |
580 | return; | |
5b7ac358 MD |
581 | } |
582 | table = sc_exit_table; | |
583 | table_len = ARRAY_SIZE(sc_exit_table); | |
584 | unknown_event = chan->sc_exit_unknown; | |
585 | } | |
74f7b56a | 586 | if (unlikely(id < 0 || id >= table_len)) { |
5b7ac358 MD |
587 | syscall_exit_unknown(unknown_event, regs, id, ret); |
588 | return; | |
589 | } | |
1aa3298b | 590 | if (unlikely(in_compat_syscall())) |
5b7ac358 MD |
591 | event = chan->compat_sc_exit_table[id]; |
592 | else | |
593 | event = chan->sc_exit_table[id]; | |
594 | if (unlikely(!event)) { | |
595 | syscall_exit_unknown(unknown_event, regs, id, ret); | |
596 | return; | |
597 | } | |
598 | entry = &table[id]; | |
599 | WARN_ON_ONCE(!entry); | |
600 | ||
601 | switch (entry->nrargs) { | |
602 | case 0: | |
603 | { | |
fc4f7161 | 604 | void (*fptr)(void *__data, long ret) = entry->func; |
5b7ac358 | 605 | |
fc4f7161 | 606 | fptr(event, ret); |
5b7ac358 MD |
607 | break; |
608 | } | |
609 | case 1: | |
610 | { | |
611 | void (*fptr)(void *__data, | |
fc4f7161 | 612 | long ret, |
5b7ac358 | 613 | unsigned long arg0) = entry->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]); |
5b7ac358 MD |
618 | break; |
619 | } | |
620 | case 2: | |
621 | { | |
622 | void (*fptr)(void *__data, | |
fc4f7161 | 623 | long ret, |
5b7ac358 MD |
624 | unsigned long arg0, |
625 | unsigned long arg1) = entry->func; | |
1b7b9c65 | 626 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 627 | |
1b7b9c65 | 628 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 629 | fptr(event, ret, args[0], args[1]); |
5b7ac358 MD |
630 | break; |
631 | } | |
632 | case 3: | |
633 | { | |
634 | void (*fptr)(void *__data, | |
fc4f7161 | 635 | long ret, |
5b7ac358 MD |
636 | unsigned long arg0, |
637 | unsigned long arg1, | |
638 | unsigned long arg2) = entry->func; | |
1b7b9c65 | 639 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 640 | |
1b7b9c65 | 641 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 642 | fptr(event, ret, args[0], args[1], args[2]); |
5b7ac358 MD |
643 | break; |
644 | } | |
645 | case 4: | |
646 | { | |
647 | void (*fptr)(void *__data, | |
fc4f7161 | 648 | long ret, |
5b7ac358 MD |
649 | unsigned long arg0, |
650 | unsigned long arg1, | |
651 | unsigned long arg2, | |
652 | unsigned long arg3) = entry->func; | |
1b7b9c65 | 653 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 654 | |
1b7b9c65 | 655 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 656 | fptr(event, ret, args[0], args[1], args[2], args[3]); |
5b7ac358 MD |
657 | break; |
658 | } | |
659 | case 5: | |
660 | { | |
661 | void (*fptr)(void *__data, | |
fc4f7161 | 662 | long ret, |
5b7ac358 MD |
663 | unsigned long arg0, |
664 | unsigned long arg1, | |
665 | unsigned long arg2, | |
666 | unsigned long arg3, | |
667 | unsigned long arg4) = entry->func; | |
1b7b9c65 | 668 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 669 | |
1b7b9c65 | 670 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 671 | fptr(event, ret, args[0], args[1], args[2], args[3], args[4]); |
5b7ac358 MD |
672 | break; |
673 | } | |
674 | case 6: | |
675 | { | |
676 | void (*fptr)(void *__data, | |
fc4f7161 | 677 | long ret, |
5b7ac358 MD |
678 | unsigned long arg0, |
679 | unsigned long arg1, | |
680 | unsigned long arg2, | |
681 | unsigned long arg3, | |
682 | unsigned long arg4, | |
683 | unsigned long arg5) = entry->func; | |
1b7b9c65 | 684 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 685 | |
1b7b9c65 | 686 | lttng_syscall_get_arguments(current, regs, args); |
fc4f7161 | 687 | fptr(event, ret, args[0], args[1], args[2], |
5b7ac358 MD |
688 | args[3], args[4], args[5]); |
689 | break; | |
690 | } | |
691 | default: | |
692 | break; | |
693 | } | |
694 | } | |
695 | ||
33a39a3c MD |
696 | /* |
697 | * noinline to diminish caller stack size. | |
698 | * Should be called with sessions lock held. | |
699 | */ | |
49c50022 MD |
700 | static |
701 | int fill_table(const struct trace_syscall_entry *table, size_t table_len, | |
5b7ac358 MD |
702 | struct lttng_event **chan_table, struct lttng_channel *chan, |
703 | void *filter, enum sc_type type) | |
259b6cb3 | 704 | { |
2a0c4816 | 705 | const struct lttng_event_desc *desc; |
259b6cb3 | 706 | unsigned int i; |
49c50022 MD |
707 | |
708 | /* Allocate events for each syscall, insert into table */ | |
709 | for (i = 0; i < table_len; i++) { | |
710 | struct lttng_kernel_event ev; | |
2a0c4816 | 711 | desc = table[i].desc; |
49c50022 MD |
712 | |
713 | if (!desc) { | |
714 | /* Unknown syscall */ | |
715 | continue; | |
716 | } | |
717 | /* | |
718 | * Skip those already populated by previous failed | |
719 | * register for this channel. | |
720 | */ | |
721 | if (chan_table[i]) | |
722 | continue; | |
723 | memset(&ev, 0, sizeof(ev)); | |
5b7ac358 MD |
724 | switch (type) { |
725 | case SC_TYPE_ENTRY: | |
ad594e3a MD |
726 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
727 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
728 | break; |
729 | case SC_TYPE_EXIT: | |
ad594e3a MD |
730 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
731 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
732 | break; |
733 | case SC_TYPE_COMPAT_ENTRY: | |
ad594e3a MD |
734 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
735 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
736 | break; |
737 | case SC_TYPE_COMPAT_EXIT: | |
ad594e3a MD |
738 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
739 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
740 | break; |
741 | } | |
b260f699 | 742 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN - 1); |
f8695253 | 743 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
33a39a3c MD |
744 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
745 | chan_table[i] = _lttng_event_create(chan, &ev, filter, | |
3c997079 | 746 | desc, ev.instrumentation); |
abc0446a MD |
747 | WARN_ON_ONCE(!chan_table[i]); |
748 | if (IS_ERR(chan_table[i])) { | |
49c50022 MD |
749 | /* |
750 | * If something goes wrong in event registration | |
751 | * after the first one, we have no choice but to | |
752 | * leave the previous events in there, until | |
753 | * deleted by session teardown. | |
754 | */ | |
abc0446a | 755 | return PTR_ERR(chan_table[i]); |
49c50022 MD |
756 | } |
757 | } | |
758 | return 0; | |
759 | } | |
760 | ||
33a39a3c MD |
761 | /* |
762 | * Should be called with sessions lock held. | |
763 | */ | |
a90917c3 | 764 | int lttng_syscalls_register(struct lttng_channel *chan, void *filter) |
49c50022 | 765 | { |
2a0c4816 | 766 | struct lttng_kernel_event ev; |
259b6cb3 MD |
767 | int ret; |
768 | ||
ea53823c | 769 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
770 | |
771 | if (!chan->sc_table) { | |
772 | /* create syscall table mapping syscall to events */ | |
a90917c3 | 773 | chan->sc_table = kzalloc(sizeof(struct lttng_event *) |
259b6cb3 MD |
774 | * ARRAY_SIZE(sc_table), GFP_KERNEL); |
775 | if (!chan->sc_table) | |
776 | return -ENOMEM; | |
777 | } | |
5b7ac358 MD |
778 | if (!chan->sc_exit_table) { |
779 | /* create syscall table mapping syscall to events */ | |
780 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
781 | * ARRAY_SIZE(sc_exit_table), GFP_KERNEL); | |
782 | if (!chan->sc_exit_table) | |
783 | return -ENOMEM; | |
784 | } | |
785 | ||
259b6cb3 | 786 | |
49c50022 MD |
787 | #ifdef CONFIG_COMPAT |
788 | if (!chan->compat_sc_table) { | |
789 | /* create syscall table mapping compat syscall to events */ | |
a90917c3 | 790 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) |
a93244f8 | 791 | * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); |
49c50022 MD |
792 | if (!chan->compat_sc_table) |
793 | return -ENOMEM; | |
794 | } | |
5b7ac358 MD |
795 | |
796 | if (!chan->compat_sc_exit_table) { | |
797 | /* create syscall table mapping compat syscall to events */ | |
798 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) | |
799 | * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); | |
800 | if (!chan->compat_sc_exit_table) | |
801 | return -ENOMEM; | |
802 | } | |
49c50022 | 803 | #endif |
f405cfce | 804 | if (!chan->sc_unknown) { |
f405cfce | 805 | const struct lttng_event_desc *desc = |
d4291869 | 806 | &__event_desc___syscall_entry_unknown; |
2f804c0a | 807 | |
f405cfce | 808 | memset(&ev, 0, sizeof(ev)); |
f8695253 MD |
809 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
810 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 811 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
ad594e3a MD |
812 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
813 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 814 | chan->sc_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
815 | desc, |
816 | ev.instrumentation); | |
abc0446a MD |
817 | WARN_ON_ONCE(!chan->sc_unknown); |
818 | if (IS_ERR(chan->sc_unknown)) { | |
819 | return PTR_ERR(chan->sc_unknown); | |
f405cfce MD |
820 | } |
821 | } | |
822 | ||
b76dc1a0 | 823 | if (!chan->sc_compat_unknown) { |
b76dc1a0 | 824 | const struct lttng_event_desc *desc = |
d4291869 | 825 | &__event_desc___compat_syscall_entry_unknown; |
b76dc1a0 MD |
826 | |
827 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
828 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
829 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 830 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
ad594e3a MD |
831 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY; |
832 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 833 | chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 MD |
834 | desc, |
835 | ev.instrumentation); | |
abc0446a MD |
836 | WARN_ON_ONCE(!chan->sc_unknown); |
837 | if (IS_ERR(chan->sc_compat_unknown)) { | |
838 | return PTR_ERR(chan->sc_compat_unknown); | |
b76dc1a0 MD |
839 | } |
840 | } | |
841 | ||
5b7ac358 | 842 | if (!chan->compat_sc_exit_unknown) { |
2f804c0a | 843 | const struct lttng_event_desc *desc = |
5b7ac358 | 844 | &__event_desc___compat_syscall_exit_unknown; |
2f804c0a MD |
845 | |
846 | memset(&ev, 0, sizeof(ev)); | |
f8695253 MD |
847 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); |
848 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 849 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
ad594e3a MD |
850 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
851 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT; | |
33a39a3c | 852 | chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev, |
3c997079 MD |
853 | filter, desc, |
854 | ev.instrumentation); | |
5b7ac358 MD |
855 | WARN_ON_ONCE(!chan->compat_sc_exit_unknown); |
856 | if (IS_ERR(chan->compat_sc_exit_unknown)) { | |
857 | return PTR_ERR(chan->compat_sc_exit_unknown); | |
858 | } | |
859 | } | |
860 | ||
861 | if (!chan->sc_exit_unknown) { | |
862 | const struct lttng_event_desc *desc = | |
863 | &__event_desc___syscall_exit_unknown; | |
864 | ||
865 | memset(&ev, 0, sizeof(ev)); | |
866 | strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN); | |
867 | ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; | |
33a39a3c | 868 | ev.instrumentation = LTTNG_KERNEL_SYSCALL; |
ad594e3a MD |
869 | ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT; |
870 | ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE; | |
33a39a3c | 871 | chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter, |
3c997079 | 872 | desc, ev.instrumentation); |
5b7ac358 MD |
873 | WARN_ON_ONCE(!chan->sc_exit_unknown); |
874 | if (IS_ERR(chan->sc_exit_unknown)) { | |
875 | return PTR_ERR(chan->sc_exit_unknown); | |
2f804c0a MD |
876 | } |
877 | } | |
878 | ||
49c50022 | 879 | ret = fill_table(sc_table, ARRAY_SIZE(sc_table), |
5b7ac358 MD |
880 | chan->sc_table, chan, filter, SC_TYPE_ENTRY); |
881 | if (ret) | |
882 | return ret; | |
883 | ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table), | |
884 | chan->sc_exit_table, chan, filter, SC_TYPE_EXIT); | |
49c50022 MD |
885 | if (ret) |
886 | return ret; | |
5b7ac358 | 887 | |
49c50022 | 888 | #ifdef CONFIG_COMPAT |
a93244f8 | 889 | ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table), |
5b7ac358 MD |
890 | chan->compat_sc_table, chan, filter, |
891 | SC_TYPE_COMPAT_ENTRY); | |
892 | if (ret) | |
893 | return ret; | |
894 | ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table), | |
895 | chan->compat_sc_exit_table, chan, filter, | |
896 | SC_TYPE_COMPAT_EXIT); | |
49c50022 MD |
897 | if (ret) |
898 | return ret; | |
899 | #endif | |
ad594e3a MD |
900 | |
901 | if (!chan->sc_filter) { | |
902 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
903 | GFP_KERNEL); | |
904 | if (!chan->sc_filter) | |
905 | return -ENOMEM; | |
906 | } | |
907 | ||
80f87dd2 MD |
908 | if (!chan->sys_enter_registered) { |
909 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
910 | (void *) syscall_entry_probe, chan); | |
911 | if (ret) | |
912 | return ret; | |
913 | chan->sys_enter_registered = 1; | |
914 | } | |
63728b02 MD |
915 | /* |
916 | * We change the name of sys_exit tracepoint due to namespace | |
917 | * conflict with sys_exit syscall entry. | |
918 | */ | |
80f87dd2 MD |
919 | if (!chan->sys_exit_registered) { |
920 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
5b7ac358 | 921 | (void *) syscall_exit_probe, chan); |
80f87dd2 MD |
922 | if (ret) { |
923 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
924 | (void *) syscall_entry_probe, chan)); | |
925 | return ret; | |
926 | } | |
927 | chan->sys_exit_registered = 1; | |
63728b02 | 928 | } |
259b6cb3 MD |
929 | return ret; |
930 | } | |
931 | ||
932 | /* | |
933 | * Only called at session destruction. | |
934 | */ | |
a90917c3 | 935 | int lttng_syscalls_unregister(struct lttng_channel *chan) |
259b6cb3 MD |
936 | { |
937 | int ret; | |
938 | ||
939 | if (!chan->sc_table) | |
940 | return 0; | |
80f87dd2 | 941 | if (chan->sys_enter_registered) { |
2d9cd7f3 FD |
942 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
943 | (void *) syscall_entry_probe, chan); | |
80f87dd2 MD |
944 | if (ret) |
945 | return ret; | |
946 | chan->sys_enter_registered = 0; | |
947 | } | |
948 | if (chan->sys_exit_registered) { | |
2d9cd7f3 FD |
949 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
950 | (void *) syscall_exit_probe, chan); | |
80f87dd2 MD |
951 | if (ret) |
952 | return ret; | |
953 | chan->sys_exit_registered = 0; | |
954 | } | |
ad594e3a MD |
955 | return 0; |
956 | } | |
957 | ||
958 | int lttng_syscalls_destroy(struct lttng_channel *chan) | |
959 | { | |
259b6cb3 | 960 | kfree(chan->sc_table); |
5b7ac358 | 961 | kfree(chan->sc_exit_table); |
49c50022 MD |
962 | #ifdef CONFIG_COMPAT |
963 | kfree(chan->compat_sc_table); | |
5b7ac358 | 964 | kfree(chan->compat_sc_exit_table); |
49c50022 | 965 | #endif |
80f87dd2 MD |
966 | kfree(chan->sc_filter); |
967 | return 0; | |
968 | } | |
969 | ||
970 | static | |
971 | int get_syscall_nr(const char *syscall_name) | |
972 | { | |
973 | int syscall_nr = -1; | |
974 | int i; | |
975 | ||
976 | for (i = 0; i < ARRAY_SIZE(sc_table); i++) { | |
977 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 978 | const char *it_name; |
80f87dd2 MD |
979 | |
980 | entry = &sc_table[i]; | |
981 | if (!entry->desc) | |
982 | continue; | |
5b7ac358 MD |
983 | it_name = entry->desc->name; |
984 | it_name += strlen(SYSCALL_ENTRY_STR); | |
985 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
986 | syscall_nr = i; |
987 | break; | |
988 | } | |
989 | } | |
990 | return syscall_nr; | |
991 | } | |
992 | ||
993 | static | |
994 | int get_compat_syscall_nr(const char *syscall_name) | |
995 | { | |
996 | int syscall_nr = -1; | |
997 | int i; | |
998 | ||
999 | for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { | |
1000 | const struct trace_syscall_entry *entry; | |
5b7ac358 | 1001 | const char *it_name; |
80f87dd2 MD |
1002 | |
1003 | entry = &compat_sc_table[i]; | |
1004 | if (!entry->desc) | |
1005 | continue; | |
5b7ac358 MD |
1006 | it_name = entry->desc->name; |
1007 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1008 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1009 | syscall_nr = i; |
1010 | break; | |
1011 | } | |
1012 | } | |
1013 | return syscall_nr; | |
1014 | } | |
1015 | ||
12e579db MD |
1016 | static |
1017 | uint32_t get_sc_tables_len(void) | |
1018 | { | |
1019 | return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); | |
1020 | } | |
1021 | ||
ad594e3a MD |
1022 | static |
1023 | const char *get_syscall_name(struct lttng_event *event) | |
80f87dd2 | 1024 | { |
ad594e3a | 1025 | size_t prefix_len = 0; |
80f87dd2 | 1026 | |
ad594e3a | 1027 | WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL); |
80f87dd2 | 1028 | |
ad594e3a MD |
1029 | switch (event->u.syscall.entryexit) { |
1030 | case LTTNG_SYSCALL_ENTRY: | |
1031 | switch (event->u.syscall.abi) { | |
1032 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1033 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1034 | break; | |
1035 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1036 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1037 | break; | |
80f87dd2 | 1038 | } |
ad594e3a MD |
1039 | break; |
1040 | case LTTNG_SYSCALL_EXIT: | |
1041 | switch (event->u.syscall.abi) { | |
1042 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1043 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1044 | break; | |
1045 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1046 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1047 | break; | |
80f87dd2 | 1048 | } |
ad594e3a | 1049 | break; |
80f87dd2 | 1050 | } |
ad594e3a MD |
1051 | WARN_ON_ONCE(prefix_len == 0); |
1052 | return event->desc->name + prefix_len; | |
1053 | } | |
1054 | ||
1055 | int lttng_syscall_filter_enable(struct lttng_channel *chan, | |
1056 | struct lttng_event *event) | |
1057 | { | |
1058 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
1059 | const char *syscall_name; | |
1060 | unsigned long *bitmap; | |
1061 | int syscall_nr; | |
1062 | ||
1063 | WARN_ON_ONCE(!chan->sc_table); | |
1064 | ||
1065 | syscall_name = get_syscall_name(event); | |
1066 | ||
1067 | switch (event->u.syscall.abi) { | |
1068 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1069 | syscall_nr = get_syscall_nr(syscall_name); | |
1070 | break; | |
1071 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1072 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1073 | break; | |
1074 | default: | |
1075 | return -EINVAL; | |
80f87dd2 | 1076 | } |
ad594e3a MD |
1077 | if (syscall_nr < 0) |
1078 | return -ENOENT; | |
1079 | ||
ad594e3a MD |
1080 | switch (event->u.syscall.entryexit) { |
1081 | case LTTNG_SYSCALL_ENTRY: | |
1082 | switch (event->u.syscall.abi) { | |
1083 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1084 | bitmap = filter->sc_entry; | |
1085 | break; | |
1086 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1087 | bitmap = filter->sc_compat_entry; | |
1088 | break; | |
638dcfc6 MD |
1089 | default: |
1090 | return -EINVAL; | |
80f87dd2 | 1091 | } |
ad594e3a MD |
1092 | break; |
1093 | case LTTNG_SYSCALL_EXIT: | |
1094 | switch (event->u.syscall.abi) { | |
1095 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1096 | bitmap = filter->sc_exit; | |
1097 | break; | |
1098 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1099 | bitmap = filter->sc_compat_exit; | |
1100 | break; | |
638dcfc6 MD |
1101 | default: |
1102 | return -EINVAL; | |
80f87dd2 | 1103 | } |
ad594e3a MD |
1104 | break; |
1105 | default: | |
1106 | return -EINVAL; | |
80f87dd2 | 1107 | } |
ad594e3a MD |
1108 | if (test_bit(syscall_nr, bitmap)) |
1109 | return -EEXIST; | |
1110 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1111 | return 0; |
80f87dd2 MD |
1112 | } |
1113 | ||
1114 | int lttng_syscall_filter_disable(struct lttng_channel *chan, | |
ad594e3a | 1115 | struct lttng_event *event) |
80f87dd2 | 1116 | { |
ad594e3a MD |
1117 | struct lttng_syscall_filter *filter = chan->sc_filter; |
1118 | const char *syscall_name; | |
1119 | unsigned long *bitmap; | |
1120 | int syscall_nr; | |
80f87dd2 MD |
1121 | |
1122 | WARN_ON_ONCE(!chan->sc_table); | |
1123 | ||
ad594e3a MD |
1124 | syscall_name = get_syscall_name(event); |
1125 | ||
1126 | switch (event->u.syscall.abi) { | |
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 | } |
ad594e3a MD |
1136 | if (syscall_nr < 0) |
1137 | return -ENOENT; | |
80f87dd2 | 1138 | |
ad594e3a MD |
1139 | switch (event->u.syscall.entryexit) { |
1140 | case LTTNG_SYSCALL_ENTRY: | |
1141 | switch (event->u.syscall.abi) { | |
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; | |
638dcfc6 MD |
1148 | default: |
1149 | return -EINVAL; | |
80f87dd2 | 1150 | } |
ad594e3a MD |
1151 | break; |
1152 | case LTTNG_SYSCALL_EXIT: | |
1153 | switch (event->u.syscall.abi) { | |
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; | |
638dcfc6 MD |
1160 | default: |
1161 | return -EINVAL; | |
80f87dd2 | 1162 | } |
ad594e3a MD |
1163 | break; |
1164 | default: | |
1165 | return -EINVAL; | |
80f87dd2 | 1166 | } |
ad594e3a MD |
1167 | if (!test_bit(syscall_nr, bitmap)) |
1168 | return -EEXIST; | |
1169 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1170 | |
ad594e3a | 1171 | return 0; |
259b6cb3 | 1172 | } |
2d2464bd MD |
1173 | |
1174 | static | |
1175 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1176 | { | |
1177 | const struct trace_syscall_entry *entry; | |
1178 | int iter = 0; | |
1179 | ||
1180 | for (entry = sc_table; | |
1181 | entry < sc_table + ARRAY_SIZE(sc_table); | |
1182 | entry++) { | |
1183 | if (iter++ >= *pos) | |
1184 | return entry; | |
1185 | } | |
1186 | for (entry = compat_sc_table; | |
1187 | entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); | |
1188 | entry++) { | |
1189 | if (iter++ >= *pos) | |
1190 | return entry; | |
1191 | } | |
1192 | /* End of list */ | |
1193 | return NULL; | |
1194 | } | |
1195 | ||
1196 | static | |
1197 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1198 | { | |
1199 | return (void *) syscall_list_get_entry(pos); | |
1200 | } | |
1201 | ||
1202 | static | |
1203 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1204 | { | |
1205 | (*ppos)++; | |
1206 | return (void *) syscall_list_get_entry(ppos); | |
1207 | } | |
1208 | ||
1209 | static | |
1210 | void syscall_list_stop(struct seq_file *m, void *p) | |
1211 | { | |
1212 | } | |
1213 | ||
12e579db MD |
1214 | static |
1215 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1216 | const struct trace_syscall_entry **table, | |
1217 | unsigned int *bitness) | |
1218 | { | |
1219 | if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) { | |
1220 | if (bitness) | |
1221 | *bitness = BITS_PER_LONG; | |
1222 | if (table) | |
1223 | *table = sc_table; | |
1224 | return 0; | |
1225 | } | |
1226 | if (!(entry >= compat_sc_table | |
1227 | && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) { | |
1228 | return -EINVAL; | |
1229 | } | |
1230 | if (bitness) | |
1231 | *bitness = 32; | |
1232 | if (table) | |
1233 | *table = compat_sc_table; | |
1234 | return 0; | |
1235 | } | |
1236 | ||
2d2464bd MD |
1237 | static |
1238 | int syscall_list_show(struct seq_file *m, void *p) | |
1239 | { | |
1240 | const struct trace_syscall_entry *table, *entry = p; | |
1241 | unsigned int bitness; | |
d4291869 | 1242 | unsigned long index; |
12e579db | 1243 | int ret; |
d4291869 | 1244 | const char *name; |
2d2464bd | 1245 | |
12e579db MD |
1246 | ret = get_sc_table(entry, &table, &bitness); |
1247 | if (ret) | |
1248 | return ret; | |
f4855b46 MD |
1249 | if (!entry->desc) |
1250 | return 0; | |
d4291869 MD |
1251 | if (table == sc_table) { |
1252 | index = entry - table; | |
1253 | name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)]; | |
1254 | } else { | |
1255 | index = (entry - table) + ARRAY_SIZE(sc_table); | |
1256 | name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; | |
1257 | } | |
12e579db | 1258 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1259 | index, name, bitness); |
2d2464bd MD |
1260 | return 0; |
1261 | } | |
1262 | ||
1263 | static | |
1264 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1265 | .start = syscall_list_start, | |
1266 | .next = syscall_list_next, | |
1267 | .stop = syscall_list_stop, | |
1268 | .show = syscall_list_show, | |
1269 | }; | |
1270 | ||
1271 | static | |
1272 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1273 | { | |
1274 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1275 | } | |
1276 | ||
1277 | const struct file_operations lttng_syscall_list_fops = { | |
1278 | .owner = THIS_MODULE, | |
1279 | .open = lttng_syscall_list_open, | |
1280 | .read = seq_read, | |
1281 | .llseek = seq_lseek, | |
1282 | .release = seq_release, | |
1283 | }; | |
12e579db | 1284 | |
ad594e3a MD |
1285 | /* |
1286 | * A syscall is enabled if it is traced for either entry or exit. | |
1287 | */ | |
12e579db MD |
1288 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
1289 | struct lttng_kernel_syscall_mask __user *usyscall_mask) | |
1290 | { | |
1291 | uint32_t len, sc_tables_len, bitmask_len; | |
1292 | int ret = 0, bit; | |
1293 | char *tmp_mask; | |
1294 | struct lttng_syscall_filter *filter; | |
1295 | ||
1296 | ret = get_user(len, &usyscall_mask->len); | |
1297 | if (ret) | |
1298 | return ret; | |
1299 | sc_tables_len = get_sc_tables_len(); | |
1300 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1301 | if (len < sc_tables_len) { | |
1302 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1303 | } | |
1304 | /* Array is large enough, we can copy array to user-space. */ | |
1305 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1306 | if (!tmp_mask) | |
1307 | return -ENOMEM; | |
1308 | filter = channel->sc_filter; | |
1309 | ||
1310 | for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) { | |
e2129868 | 1311 | char state; |
2f25059d MD |
1312 | |
1313 | if (channel->sc_table) { | |
ad594e3a MD |
1314 | if (!READ_ONCE(channel->syscall_all) && filter) |
1315 | state = test_bit(bit, filter->sc_entry) | |
1316 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1317 | else |
1318 | state = 1; | |
1319 | } else { | |
1320 | state = 0; | |
1321 | } | |
1322 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1323 | } |
1324 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1325 | char state; |
2f25059d MD |
1326 | |
1327 | if (channel->compat_sc_table) { | |
ad594e3a | 1328 | if (!READ_ONCE(channel->syscall_all) && filter) |
2f25059d | 1329 | state = test_bit(bit - ARRAY_SIZE(sc_table), |
ad594e3a MD |
1330 | filter->sc_compat_entry) |
1331 | || test_bit(bit - ARRAY_SIZE(sc_table), | |
1332 | filter->sc_compat_exit); | |
2f25059d MD |
1333 | else |
1334 | state = 1; | |
1335 | } else { | |
1336 | state = 0; | |
1337 | } | |
1338 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1339 | } |
1340 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1341 | ret = -EFAULT; | |
1342 | kfree(tmp_mask); | |
1343 | return ret; | |
1344 | } | |
082d4946 MD |
1345 | |
1346 | int lttng_abi_syscall_list(void) | |
1347 | { | |
1348 | struct file *syscall_list_file; | |
1349 | int file_fd, ret; | |
1350 | ||
4ac10b76 | 1351 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1352 | if (file_fd < 0) { |
1353 | ret = file_fd; | |
1354 | goto fd_error; | |
1355 | } | |
1356 | ||
1357 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1358 | <tng_syscall_list_fops, | |
1359 | NULL, O_RDWR); | |
1360 | if (IS_ERR(syscall_list_file)) { | |
1361 | ret = PTR_ERR(syscall_list_file); | |
1362 | goto file_error; | |
1363 | } | |
1364 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1365 | if (ret < 0) | |
1366 | goto open_error; | |
1367 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1368 | return file_fd; |
1369 | ||
1370 | open_error: | |
1371 | fput(syscall_list_file); | |
1372 | file_error: | |
1373 | put_unused_fd(file_fd); | |
1374 | fd_error: | |
1375 | return ret; | |
1376 | } |