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 | 27 | #include <wrapper/tracepoint.h> |
241ae9a8 | 28 | #include <wrapper/rcu.h> |
1b7b9c65 | 29 | #include <wrapper/syscall.h> |
5987e66c | 30 | #include <wrapper/limits.h> |
2df37e95 | 31 | #include <lttng/events.h> |
6f156b09 | 32 | #include <lttng/events-internal.h> |
8a8ac9a8 | 33 | #include <lttng/utils.h> |
259b6cb3 | 34 | |
ebcc64cd FD |
35 | #include "lttng-syscalls.h" |
36 | ||
6333ace3 | 37 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
38 | # ifndef is_compat_task |
39 | # define is_compat_task() (0) | |
40 | # endif | |
6333ace3 MD |
41 | #endif |
42 | ||
1aa3298b MD |
43 | /* in_compat_syscall appears in kernel 4.6. */ |
44 | #ifndef in_compat_syscall | |
45 | #define in_compat_syscall() is_compat_task() | |
46 | #endif | |
47 | ||
5b7ac358 MD |
48 | enum sc_type { |
49 | SC_TYPE_ENTRY, | |
50 | SC_TYPE_EXIT, | |
51 | SC_TYPE_COMPAT_ENTRY, | |
52 | SC_TYPE_COMPAT_EXIT, | |
53 | }; | |
54 | ||
d4291869 MD |
55 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
56 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
57 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
58 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
59 | ||
60 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
61 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
62 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
63 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 64 | |
2d6d88c6 | 65 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
2d6d88c6 | 66 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 67 | |
80f87dd2 MD |
68 | #ifdef IA32_NR_syscalls |
69 | #define NR_compat_syscalls IA32_NR_syscalls | |
70 | #else | |
71 | #define NR_compat_syscalls NR_syscalls | |
72 | #endif | |
73 | ||
259b6cb3 MD |
74 | /* |
75 | * Create LTTng tracepoint probes. | |
76 | */ | |
77 | #define LTTNG_PACKAGE_BUILD | |
78 | #define CREATE_TRACE_POINTS | |
2655f9ad | 79 | #define TP_MODULE_NOINIT |
c075712b | 80 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 81 | |
a93244f8 MD |
82 | #define PARAMS(args...) args |
83 | ||
5b7ac358 | 84 | /* Handle unknown syscalls */ |
72a52753 | 85 | #undef TRACE_SYSTEM |
5b7ac358 | 86 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 87 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
88 | #undef TRACE_SYSTEM |
89 | ||
5b7ac358 | 90 | #undef TP_PROBE_CB |
fc4f7161 | 91 | |
e42c4f49 FD |
92 | extern const struct trace_syscall_table sc_table; |
93 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 94 | |
2d6d88c6 | 95 | /* Event syscall exit table */ |
e42c4f49 FD |
96 | extern const struct trace_syscall_table sc_exit_table; |
97 | extern const struct trace_syscall_table compat_sc_exit_table; | |
ebcc64cd FD |
98 | |
99 | ||
fc4f7161 MD |
100 | #undef SC_EXIT |
101 | ||
a93244f8 | 102 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 103 | |
80f87dd2 | 104 | struct lttng_syscall_filter { |
badfe9f5 MD |
105 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
106 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
107 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
108 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
7f52f0d4 MD |
109 | |
110 | /* | |
111 | * Reference counters keeping track of number of events enabled | |
112 | * for each bit. | |
113 | */ | |
114 | u32 sc_entry_refcount_map[NR_syscalls]; | |
115 | u32 sc_exit_refcount_map[NR_syscalls]; | |
116 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
117 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
118 | }; |
119 | ||
3b82c4e1 | 120 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 121 | struct pt_regs *regs, long id) |
f405cfce | 122 | { |
1b7b9c65 | 123 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 124 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 125 | |
1b7b9c65 | 126 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 127 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 128 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 129 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 130 | else |
e2d5dbc7 | 131 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
132 | } |
133 | } | |
134 | ||
63aa9160 | 135 | static __always_inline |
e2d5dbc7 | 136 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 137 | void *func, unsigned int nrargs, |
63aa9160 | 138 | struct pt_regs *regs) |
259b6cb3 | 139 | { |
a67ba386 | 140 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 141 | |
63aa9160 | 142 | switch (nrargs) { |
259b6cb3 MD |
143 | case 0: |
144 | { | |
63aa9160 | 145 | void (*fptr)(void *__data) = func; |
259b6cb3 | 146 | |
e2d5dbc7 MD |
147 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
148 | fptr(event_priv->pub); | |
259b6cb3 MD |
149 | break; |
150 | } | |
151 | case 1: | |
152 | { | |
63aa9160 | 153 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 154 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 155 | |
1b7b9c65 | 156 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
157 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
158 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
159 | break; |
160 | } | |
161 | case 2: | |
162 | { | |
163 | void (*fptr)(void *__data, | |
164 | unsigned long arg0, | |
63aa9160 | 165 | unsigned long arg1) = func; |
1b7b9c65 | 166 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 167 | |
1b7b9c65 | 168 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
169 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
170 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
171 | break; |
172 | } | |
173 | case 3: | |
174 | { | |
175 | void (*fptr)(void *__data, | |
176 | unsigned long arg0, | |
177 | unsigned long arg1, | |
63aa9160 | 178 | unsigned long arg2) = func; |
1b7b9c65 | 179 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 180 | |
1b7b9c65 | 181 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
182 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
183 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
184 | break; |
185 | } | |
186 | case 4: | |
187 | { | |
188 | void (*fptr)(void *__data, | |
189 | unsigned long arg0, | |
190 | unsigned long arg1, | |
191 | unsigned long arg2, | |
63aa9160 | 192 | unsigned long arg3) = func; |
1b7b9c65 | 193 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 194 | |
1b7b9c65 | 195 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
196 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
197 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
198 | break; |
199 | } | |
200 | case 5: | |
201 | { | |
202 | void (*fptr)(void *__data, | |
203 | unsigned long arg0, | |
204 | unsigned long arg1, | |
205 | unsigned long arg2, | |
206 | unsigned long arg3, | |
63aa9160 | 207 | unsigned long arg4) = func; |
1b7b9c65 | 208 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 209 | |
1b7b9c65 | 210 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
211 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
212 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
213 | break; |
214 | } | |
215 | case 6: | |
216 | { | |
217 | void (*fptr)(void *__data, | |
218 | unsigned long arg0, | |
219 | unsigned long arg1, | |
220 | unsigned long arg2, | |
221 | unsigned long arg3, | |
222 | unsigned long arg4, | |
63aa9160 | 223 | unsigned long arg5) = func; |
1b7b9c65 | 224 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 225 | |
1b7b9c65 | 226 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
227 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
228 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 229 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
230 | break; |
231 | } | |
232 | default: | |
233 | break; | |
234 | } | |
235 | } | |
236 | ||
63aa9160 FD |
237 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
238 | { | |
0bb716a8 | 239 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 240 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
241 | const struct trace_syscall_entry *table, *entry; |
242 | size_t table_len; | |
243 | ||
244 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 245 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
246 | |
247 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 248 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
249 | /* System call filtered out. */ |
250 | return; | |
251 | } | |
ebcc64cd FD |
252 | table = compat_sc_table.table; |
253 | table_len = compat_sc_table.len; | |
0bb716a8 | 254 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 255 | } else { |
0bb716a8 | 256 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
257 | |
258 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 259 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
260 | /* System call filtered out. */ |
261 | return; | |
262 | } | |
ebcc64cd FD |
263 | table = sc_table.table; |
264 | table_len = sc_table.len; | |
0bb716a8 | 265 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
266 | } |
267 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 268 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
269 | return; |
270 | } | |
3b82c4e1 MD |
271 | |
272 | entry = &table[id]; | |
273 | if (!entry->event_func) { | |
274 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
275 | return; |
276 | } | |
3b82c4e1 MD |
277 | |
278 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 279 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 280 | } else { |
0bb716a8 | 281 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
282 | } |
283 | if (unlikely(hlist_empty(action_list))) | |
284 | return; | |
285 | ||
e2d5dbc7 | 286 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
287 | } |
288 | ||
3b82c4e1 | 289 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 290 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 291 | { |
1b7b9c65 | 292 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 293 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 294 | |
1b7b9c65 | 295 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 296 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 297 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 298 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
299 | args); |
300 | else | |
e2d5dbc7 | 301 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 302 | } |
5b7ac358 MD |
303 | } |
304 | ||
3b82c4e1 | 305 | static __always_inline |
e2d5dbc7 | 306 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
307 | void *func, unsigned int nrargs, |
308 | struct pt_regs *regs, long ret) | |
5b7ac358 | 309 | { |
a67ba386 | 310 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 311 | |
3b82c4e1 | 312 | switch (nrargs) { |
5b7ac358 MD |
313 | case 0: |
314 | { | |
3b82c4e1 | 315 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 316 | |
e2d5dbc7 MD |
317 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
318 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
319 | break; |
320 | } | |
321 | case 1: | |
322 | { | |
323 | void (*fptr)(void *__data, | |
fc4f7161 | 324 | long ret, |
3b82c4e1 | 325 | unsigned long arg0) = func; |
1b7b9c65 | 326 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 327 | |
1b7b9c65 | 328 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
329 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
330 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
331 | break; |
332 | } | |
333 | case 2: | |
334 | { | |
335 | void (*fptr)(void *__data, | |
fc4f7161 | 336 | long ret, |
5b7ac358 | 337 | unsigned long arg0, |
3b82c4e1 | 338 | unsigned long arg1) = func; |
1b7b9c65 | 339 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 340 | |
1b7b9c65 | 341 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
342 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
343 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
344 | break; |
345 | } | |
346 | case 3: | |
347 | { | |
348 | void (*fptr)(void *__data, | |
fc4f7161 | 349 | long ret, |
5b7ac358 MD |
350 | unsigned long arg0, |
351 | unsigned long arg1, | |
3b82c4e1 | 352 | unsigned long arg2) = func; |
1b7b9c65 | 353 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 354 | |
1b7b9c65 | 355 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
356 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
357 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
358 | break; |
359 | } | |
360 | case 4: | |
361 | { | |
362 | void (*fptr)(void *__data, | |
fc4f7161 | 363 | long ret, |
5b7ac358 MD |
364 | unsigned long arg0, |
365 | unsigned long arg1, | |
366 | unsigned long arg2, | |
3b82c4e1 | 367 | unsigned long arg3) = func; |
1b7b9c65 | 368 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 369 | |
1b7b9c65 | 370 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
371 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
372 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
373 | break; |
374 | } | |
375 | case 5: | |
376 | { | |
377 | void (*fptr)(void *__data, | |
fc4f7161 | 378 | long ret, |
5b7ac358 MD |
379 | unsigned long arg0, |
380 | unsigned long arg1, | |
381 | unsigned long arg2, | |
382 | unsigned long arg3, | |
3b82c4e1 | 383 | unsigned long arg4) = func; |
1b7b9c65 | 384 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 385 | |
1b7b9c65 | 386 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
387 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
388 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
389 | break; |
390 | } | |
391 | case 6: | |
392 | { | |
393 | void (*fptr)(void *__data, | |
fc4f7161 | 394 | long ret, |
5b7ac358 MD |
395 | unsigned long arg0, |
396 | unsigned long arg1, | |
397 | unsigned long arg2, | |
398 | unsigned long arg3, | |
399 | unsigned long arg4, | |
3b82c4e1 | 400 | unsigned long arg5) = func; |
1b7b9c65 | 401 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 402 | |
1b7b9c65 | 403 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
404 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
405 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 406 | args[3], args[4], args[5]); |
5b7ac358 MD |
407 | break; |
408 | } | |
409 | default: | |
410 | break; | |
411 | } | |
412 | } | |
413 | ||
3b82c4e1 MD |
414 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
415 | { | |
0bb716a8 | 416 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
417 | struct hlist_head *action_list, *unknown_action_list; |
418 | const struct trace_syscall_entry *table, *entry; | |
419 | size_t table_len; | |
420 | long id; | |
421 | ||
422 | id = syscall_get_nr(current, regs); | |
423 | ||
424 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 425 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
426 | |
427 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 428 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
429 | /* System call filtered out. */ |
430 | return; | |
431 | } | |
ebcc64cd FD |
432 | table = compat_sc_exit_table.table; |
433 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 434 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 435 | } else { |
0bb716a8 | 436 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
437 | |
438 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 439 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
440 | /* System call filtered out. */ |
441 | return; | |
442 | } | |
ebcc64cd FD |
443 | table = sc_exit_table.table; |
444 | table_len = sc_exit_table.len; | |
0bb716a8 | 445 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
446 | } |
447 | if (unlikely(id < 0 || id >= table_len)) { | |
448 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
449 | return; | |
450 | } | |
451 | ||
452 | entry = &table[id]; | |
453 | if (!entry->event_func) { | |
454 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
455 | return; | |
456 | } | |
457 | ||
458 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 459 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 460 | } else { |
0bb716a8 | 461 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
462 | } |
463 | if (unlikely(hlist_empty(action_list))) | |
464 | return; | |
465 | ||
e2d5dbc7 | 466 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
467 | regs, ret); |
468 | } | |
469 | ||
0bb716a8 MD |
470 | static |
471 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 472 | { |
0bb716a8 MD |
473 | switch (event_enabler->enabler_type) { |
474 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
475 | { | |
1ae083ba MD |
476 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
477 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 478 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 479 | } |
0bb716a8 MD |
480 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
481 | { | |
482 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
483 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
484 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 485 | } |
0bb716a8 MD |
486 | default: |
487 | return NULL; | |
8a8ac9a8 | 488 | } |
0bb716a8 | 489 | } |
8a8ac9a8 | 490 | |
0bb716a8 MD |
491 | static |
492 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
493 | { | |
494 | switch (event->type) { | |
495 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
496 | { | |
497 | struct lttng_kernel_event_recorder *event_recorder = | |
498 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
499 | return &event_recorder->chan->priv->parent.syscall_table; | |
500 | } | |
501 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
502 | { | |
503 | struct lttng_kernel_event_notifier *event_notifier = | |
504 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
505 | return &event_notifier->priv->group->syscall_table; | |
506 | } | |
507 | default: | |
508 | return NULL; | |
8a8ac9a8 | 509 | } |
8a8ac9a8 | 510 | } |
0bb716a8 | 511 | |
5408b6d6 MD |
512 | static |
513 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
99903379 | 514 | const struct lttng_kernel_event_desc *desc, enum sc_type type, unsigned int syscall_nr) |
5408b6d6 MD |
515 | { |
516 | struct lttng_kernel_event_common *event; | |
517 | ||
518 | switch (syscall_event_enabler->enabler_type) { | |
519 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
520 | { | |
521 | struct lttng_event_recorder_enabler *syscall_event_recorder_enabler = | |
522 | container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
523 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
524 | struct lttng_kernel_abi_event ev; | |
525 | ||
526 | /* We need to create an event for this syscall/enabler. */ | |
527 | memset(&ev, 0, sizeof(ev)); | |
528 | switch (type) { | |
529 | case SC_TYPE_ENTRY: | |
530 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
531 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
532 | break; | |
533 | case SC_TYPE_EXIT: | |
534 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
535 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
536 | break; | |
537 | case SC_TYPE_COMPAT_ENTRY: | |
538 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
539 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
540 | break; | |
541 | case SC_TYPE_COMPAT_EXIT: | |
542 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
543 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
544 | break; | |
545 | } | |
546 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); | |
547 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
548 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
549 | event_recorder_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, | |
550 | syscall_event_recorder_enabler->chan); | |
551 | WARN_ON_ONCE(!event_recorder_enabler); | |
552 | if (!event_recorder_enabler) | |
553 | return; | |
554 | event = _lttng_kernel_event_create(&event_recorder_enabler->parent, desc); | |
c3fb484e | 555 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 556 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
c3fb484e | 557 | if (IS_ERR(event)) { |
5408b6d6 MD |
558 | printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name); |
559 | return; | |
560 | } | |
9cd106a6 | 561 | event->priv->u.syscall.syscall_id = syscall_nr; |
5408b6d6 MD |
562 | break; |
563 | } | |
564 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
565 | { | |
566 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
567 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
568 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
569 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
570 | uint64_t user_token = syscall_event_enabler->user_token; | |
571 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
572 | ||
573 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
574 | switch (type) { | |
575 | case SC_TYPE_ENTRY: | |
576 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
577 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
578 | break; | |
579 | case SC_TYPE_EXIT: | |
580 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
581 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
582 | break; | |
583 | case SC_TYPE_COMPAT_ENTRY: | |
584 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
585 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
586 | break; | |
587 | case SC_TYPE_COMPAT_EXIT: | |
588 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
589 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
590 | break; | |
591 | } | |
592 | strncat(event_notifier_param.event.name, desc->event_name, | |
593 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
594 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
595 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
596 | event_notifier_param.event.token = user_token; | |
597 | event_notifier_param.error_counter_index = error_counter_index; | |
598 | ||
599 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
600 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
601 | WARN_ON_ONCE(!event_notifier_enabler); | |
602 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); | |
c3fb484e | 603 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 604 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 605 | if (IS_ERR(event)) { |
5408b6d6 MD |
606 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
607 | return; | |
608 | } | |
609 | event->priv->u.syscall.syscall_id = syscall_nr; | |
610 | break; | |
611 | } | |
612 | default: | |
613 | break; | |
614 | } | |
615 | } | |
616 | ||
49c50022 | 617 | static |
67233a18 MD |
618 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
619 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 620 | { |
063f0825 MD |
621 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common); |
622 | const struct lttng_kernel_event_desc *desc; | |
259b6cb3 | 623 | unsigned int i; |
49c50022 | 624 | |
1d303f69 MD |
625 | #ifndef CONFIG_COMPAT |
626 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 627 | return; |
1d303f69 | 628 | #endif |
67233a18 | 629 | /* iterate over all syscall and create event that match */ |
49c50022 | 630 | for (i = 0; i < table_len; i++) { |
19bef247 | 631 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 632 | struct hlist_head *head; |
6768203a | 633 | bool found = false; |
49c50022 | 634 | |
063f0825 | 635 | desc = table[i].desc; |
49c50022 MD |
636 | if (!desc) { |
637 | /* Unknown syscall */ | |
638 | continue; | |
639 | } | |
063f0825 MD |
640 | |
641 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 642 | continue; |
063f0825 | 643 | |
49c50022 | 644 | /* |
3b82c4e1 | 645 | * Check if already created. |
49c50022 | 646 | */ |
0def9170 | 647 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 648 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
6768203a MD |
649 | if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) { |
650 | found = true; | |
651 | break; | |
652 | } | |
3b82c4e1 MD |
653 | } |
654 | if (found) | |
49c50022 | 655 | continue; |
3b82c4e1 | 656 | |
99903379 | 657 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, type, i); |
49c50022 | 658 | } |
49c50022 MD |
659 | } |
660 | ||
552f7c79 MD |
661 | static |
662 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
663 | { | |
664 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
665 | return false; | |
666 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
667 | return false; | |
668 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
669 | return false; | |
670 | if (strcmp(event_enabler->event_param.name, "*")) | |
671 | return false; | |
672 | return true; | |
673 | } | |
674 | ||
9f6f4507 MD |
675 | static |
676 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
677 | { | |
9f6f4507 MD |
678 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
679 | struct lttng_kernel_event_common_private *event_priv; | |
680 | const struct lttng_kernel_event_desc *desc; | |
9f6f4507 MD |
681 | bool found = false; |
682 | struct hlist_head *head; | |
683 | ||
1d303f69 MD |
684 | #ifndef CONFIG_COMPAT |
685 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 686 | return; |
1d303f69 | 687 | #endif |
552f7c79 MD |
688 | /* |
689 | * Considering that currently system calls can only be enabled on a per | |
690 | * name basis (or wildcard based on a name), unknown syscall events are | |
691 | * only used when matching *all* system calls, because this is the only | |
692 | * case which can be associated with an unknown system call. | |
693 | * | |
694 | * When enabling system call on a per system call number basis will be | |
695 | * supported, this will need to be revisited. | |
696 | */ | |
697 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
698 | return; | |
699 | ||
9f6f4507 MD |
700 | switch (type) { |
701 | case SC_TYPE_ENTRY: | |
702 | desc = &__event_desc___syscall_entry_unknown; | |
9f6f4507 MD |
703 | break; |
704 | case SC_TYPE_EXIT: | |
705 | desc = &__event_desc___syscall_exit_unknown; | |
9f6f4507 MD |
706 | break; |
707 | case SC_TYPE_COMPAT_ENTRY: | |
708 | desc = &__event_desc___compat_syscall_entry_unknown; | |
9f6f4507 MD |
709 | break; |
710 | case SC_TYPE_COMPAT_EXIT: | |
711 | desc = &__event_desc___compat_syscall_exit_unknown; | |
9f6f4507 MD |
712 | break; |
713 | default: | |
714 | WARN_ON_ONCE(1); | |
715 | } | |
716 | ||
717 | /* | |
718 | * Check if already created. | |
719 | */ | |
720 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); | |
721 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { | |
6768203a | 722 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
9f6f4507 | 723 | found = true; |
6768203a MD |
724 | break; |
725 | } | |
9f6f4507 MD |
726 | } |
727 | if (!found) | |
99903379 | 728 | lttng_syscall_event_enabler_create_event(event_enabler, desc, type, -1U); |
9f6f4507 MD |
729 | } |
730 | ||
d26015f6 | 731 | static |
15a00134 | 732 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 733 | { |
15a00134 | 734 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 735 | |
15a00134 MD |
736 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
737 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
738 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
739 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
740 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
741 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
742 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
743 | } | |
1ab4126a | 744 | |
15a00134 MD |
745 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
746 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
747 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
748 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
749 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
750 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
751 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
752 | } | |
259b6cb3 MD |
753 | } |
754 | ||
755 | /* | |
8a8ac9a8 FD |
756 | * Should be called with sessions lock held. |
757 | */ | |
b2f63bde | 758 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 759 | { |
d26015f6 MD |
760 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
761 | int ret; | |
8a8ac9a8 | 762 | |
0bb716a8 | 763 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 764 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
765 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
766 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 767 | return -ENOMEM; |
8a8ac9a8 | 768 | } |
0bb716a8 | 769 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
770 | /* create syscall table mapping syscall to events */ |
771 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 772 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 773 | return -ENOMEM; |
8a8ac9a8 FD |
774 | } |
775 | ||
776 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 777 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 778 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
779 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
780 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 781 | return -ENOMEM; |
8a8ac9a8 FD |
782 | } |
783 | ||
0bb716a8 | 784 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
785 | /* create syscall table mapping compat syscall to events */ |
786 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 787 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 788 | return -ENOMEM; |
8a8ac9a8 FD |
789 | } |
790 | #endif | |
0bb716a8 MD |
791 | if (!syscall_table->sc_filter) { |
792 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 793 | GFP_KERNEL); |
0bb716a8 | 794 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
795 | return -ENOMEM; |
796 | } | |
797 | ||
0bb716a8 | 798 | if (!syscall_table->sys_enter_registered) { |
a6837bed | 799 | ret = lttng_tracepoint_probe_register("sys_enter", |
0bb716a8 | 800 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
801 | if (ret) |
802 | return ret; | |
0bb716a8 | 803 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 804 | } |
0bb716a8 | 805 | if (!syscall_table->sys_exit_registered) { |
a6837bed | 806 | ret = lttng_tracepoint_probe_register("sys_exit", |
0bb716a8 | 807 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 | 808 | if (ret) { |
a6837bed | 809 | WARN_ON_ONCE(lttng_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 810 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
811 | return ret; |
812 | } | |
0bb716a8 | 813 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 814 | } |
0fab709d | 815 | |
86e12a51 MD |
816 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
817 | ||
fad51c94 | 818 | return 0; |
8a8ac9a8 FD |
819 | } |
820 | ||
6053e75e | 821 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
822 | { |
823 | int ret; | |
824 | ||
0bb716a8 | 825 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 826 | return 0; |
0bb716a8 | 827 | if (syscall_table->sys_enter_registered) { |
a6837bed | 828 | ret = lttng_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 829 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
830 | if (ret) |
831 | return ret; | |
0bb716a8 | 832 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 833 | } |
0bb716a8 | 834 | if (syscall_table->sys_exit_registered) { |
a6837bed | 835 | ret = lttng_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 836 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
837 | if (ret) |
838 | return ret; | |
0bb716a8 | 839 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 840 | } |
badfe9f5 MD |
841 | return 0; |
842 | } | |
843 | ||
6053e75e | 844 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 845 | { |
0bb716a8 MD |
846 | kfree(syscall_table->syscall_dispatch); |
847 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 848 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
849 | kfree(syscall_table->compat_syscall_dispatch); |
850 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 851 | #endif |
0bb716a8 | 852 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
853 | return 0; |
854 | } | |
855 | ||
12e579db MD |
856 | static |
857 | uint32_t get_sc_tables_len(void) | |
858 | { | |
ebcc64cd | 859 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
860 | } |
861 | ||
badfe9f5 | 862 | static |
ade8a729 FD |
863 | const char *get_syscall_name(const char *desc_name, |
864 | enum lttng_syscall_abi abi, | |
865 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 866 | { |
badfe9f5 | 867 | size_t prefix_len = 0; |
80f87dd2 | 868 | |
80f87dd2 | 869 | |
ade8a729 | 870 | switch (entryexit) { |
badfe9f5 | 871 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 872 | switch (abi) { |
badfe9f5 MD |
873 | case LTTNG_SYSCALL_ABI_NATIVE: |
874 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
875 | break; | |
876 | case LTTNG_SYSCALL_ABI_COMPAT: | |
877 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
878 | break; | |
80f87dd2 | 879 | } |
badfe9f5 MD |
880 | break; |
881 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 882 | switch (abi) { |
badfe9f5 MD |
883 | case LTTNG_SYSCALL_ABI_NATIVE: |
884 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
885 | break; | |
886 | case LTTNG_SYSCALL_ABI_COMPAT: | |
887 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
888 | break; | |
80f87dd2 | 889 | } |
badfe9f5 | 890 | break; |
80f87dd2 | 891 | } |
badfe9f5 | 892 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 893 | return desc_name + prefix_len; |
badfe9f5 MD |
894 | } |
895 | ||
ade8a729 FD |
896 | static |
897 | int lttng_syscall_filter_enable( | |
898 | struct lttng_syscall_filter *filter, | |
899 | const char *desc_name, enum lttng_syscall_abi abi, | |
99903379 MD |
900 | enum lttng_syscall_entryexit entryexit, |
901 | unsigned int syscall_id) | |
badfe9f5 | 902 | { |
badfe9f5 MD |
903 | const char *syscall_name; |
904 | unsigned long *bitmap; | |
7f52f0d4 | 905 | u32 *refcount_map; |
badfe9f5 | 906 | |
ade8a729 | 907 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 908 | |
ade8a729 | 909 | switch (entryexit) { |
badfe9f5 | 910 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 911 | switch (abi) { |
badfe9f5 MD |
912 | case LTTNG_SYSCALL_ABI_NATIVE: |
913 | bitmap = filter->sc_entry; | |
7f52f0d4 | 914 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
915 | break; |
916 | case LTTNG_SYSCALL_ABI_COMPAT: | |
917 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 918 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 919 | break; |
6d9694d8 MD |
920 | default: |
921 | return -EINVAL; | |
80f87dd2 | 922 | } |
badfe9f5 MD |
923 | break; |
924 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 925 | switch (abi) { |
badfe9f5 MD |
926 | case LTTNG_SYSCALL_ABI_NATIVE: |
927 | bitmap = filter->sc_exit; | |
7f52f0d4 | 928 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
929 | break; |
930 | case LTTNG_SYSCALL_ABI_COMPAT: | |
931 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 932 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 933 | break; |
6d9694d8 MD |
934 | default: |
935 | return -EINVAL; | |
80f87dd2 | 936 | } |
badfe9f5 MD |
937 | break; |
938 | default: | |
939 | return -EINVAL; | |
80f87dd2 | 940 | } |
99903379 | 941 | if (refcount_map[syscall_id] == U32_MAX) |
7f52f0d4 | 942 | return -EOVERFLOW; |
99903379 MD |
943 | if (refcount_map[syscall_id]++ == 0) |
944 | bitmap_set(bitmap, syscall_id, 1); | |
80f87dd2 | 945 | return 0; |
80f87dd2 MD |
946 | } |
947 | ||
9b2f1c54 | 948 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 949 | { |
9b2f1c54 | 950 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
951 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
952 | struct hlist_head *dispatch_list; | |
ca62543e | 953 | int ret = 0; |
8a8ac9a8 | 954 | |
9b2f1c54 | 955 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 956 | |
99903379 MD |
957 | /* Unknown syscall */ |
958 | if (syscall_id == -1U) { | |
959 | switch (event->priv->u.syscall.entryexit) { | |
960 | case LTTNG_SYSCALL_ENTRY: | |
961 | switch (event->priv->u.syscall.abi) { | |
962 | case LTTNG_SYSCALL_ABI_NATIVE: | |
963 | dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
964 | break; | |
965 | case LTTNG_SYSCALL_ABI_COMPAT: | |
966 | dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
967 | break; | |
968 | default: | |
969 | ret = -EINVAL; | |
970 | goto end; | |
971 | } | |
9cd106a6 | 972 | break; |
99903379 MD |
973 | case LTTNG_SYSCALL_EXIT: |
974 | switch (event->priv->u.syscall.abi) { | |
975 | case LTTNG_SYSCALL_ABI_NATIVE: | |
976 | dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
977 | break; | |
978 | case LTTNG_SYSCALL_ABI_COMPAT: | |
979 | dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
980 | break; | |
981 | default: | |
982 | ret = -EINVAL; | |
983 | goto end; | |
984 | } | |
9cd106a6 MD |
985 | break; |
986 | default: | |
987 | ret = -EINVAL; | |
988 | goto end; | |
989 | } | |
99903379 MD |
990 | } else { |
991 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, | |
992 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
993 | event->priv->u.syscall.entryexit, syscall_id); | |
994 | if (ret) | |
995 | return ret; | |
996 | ||
997 | switch (event->priv->u.syscall.entryexit) { | |
998 | case LTTNG_SYSCALL_ENTRY: | |
999 | switch (event->priv->u.syscall.abi) { | |
1000 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1001 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1002 | break; | |
1003 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1004 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1005 | break; | |
1006 | default: | |
1007 | ret = -EINVAL; | |
1008 | goto end; | |
1009 | } | |
8a8ac9a8 | 1010 | break; |
99903379 MD |
1011 | case LTTNG_SYSCALL_EXIT: |
1012 | switch (event->priv->u.syscall.abi) { | |
1013 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1014 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1015 | break; | |
1016 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1017 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1018 | break; | |
1019 | default: | |
1020 | ret = -EINVAL; | |
1021 | goto end; | |
1022 | } | |
8a8ac9a8 | 1023 | break; |
6866b1c7 MJ |
1024 | default: |
1025 | ret = -EINVAL; | |
1026 | goto end; | |
8a8ac9a8 | 1027 | } |
8a8ac9a8 | 1028 | } |
9cd106a6 MD |
1029 | |
1030 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1031 | end: |
9b2f1c54 | 1032 | return ret; |
ade8a729 FD |
1033 | } |
1034 | ||
1035 | static | |
f2db8be3 | 1036 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 | 1037 | const char *desc_name, enum lttng_syscall_abi abi, |
99903379 MD |
1038 | enum lttng_syscall_entryexit entryexit, |
1039 | unsigned int syscall_id) | |
ade8a729 | 1040 | { |
badfe9f5 MD |
1041 | const char *syscall_name; |
1042 | unsigned long *bitmap; | |
7f52f0d4 | 1043 | u32 *refcount_map; |
80f87dd2 | 1044 | |
ade8a729 | 1045 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1046 | |
ade8a729 | 1047 | switch (entryexit) { |
badfe9f5 | 1048 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1049 | switch (abi) { |
badfe9f5 MD |
1050 | case LTTNG_SYSCALL_ABI_NATIVE: |
1051 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1052 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1053 | break; |
1054 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1055 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1056 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1057 | break; |
6d9694d8 MD |
1058 | default: |
1059 | return -EINVAL; | |
80f87dd2 | 1060 | } |
badfe9f5 MD |
1061 | break; |
1062 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1063 | switch (abi) { |
badfe9f5 MD |
1064 | case LTTNG_SYSCALL_ABI_NATIVE: |
1065 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1066 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1067 | break; |
1068 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1069 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1070 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1071 | break; |
6d9694d8 MD |
1072 | default: |
1073 | return -EINVAL; | |
80f87dd2 | 1074 | } |
badfe9f5 MD |
1075 | break; |
1076 | default: | |
1077 | return -EINVAL; | |
80f87dd2 | 1078 | } |
99903379 | 1079 | if (refcount_map[syscall_id] == 0) |
7f52f0d4 | 1080 | return -ENOENT; |
99903379 MD |
1081 | if (--refcount_map[syscall_id] == 0) |
1082 | bitmap_clear(bitmap, syscall_id, 1); | |
badfe9f5 | 1083 | return 0; |
259b6cb3 | 1084 | } |
2d2464bd | 1085 | |
9b2f1c54 | 1086 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1087 | { |
9b2f1c54 | 1088 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
7f52f0d4 | 1089 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
8a8ac9a8 FD |
1090 | int ret; |
1091 | ||
99903379 MD |
1092 | /* Except for unknown syscall */ |
1093 | if (syscall_id != -1U) { | |
1094 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, | |
1095 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1096 | event->priv->u.syscall.entryexit, syscall_id); | |
1097 | if (ret) | |
1098 | return ret; | |
1099 | } | |
9cd106a6 | 1100 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1101 | return 0; |
1102 | } | |
1103 | ||
9cb5be7e MD |
1104 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1105 | { | |
1106 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1107 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1108 | int enabled = event_enabler->enabled; | |
1109 | ||
552f7c79 | 1110 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1111 | return; |
9cb5be7e MD |
1112 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1113 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1114 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1115 | ||
1116 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1117 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1118 | } | |
1119 | ||
2d2464bd MD |
1120 | static |
1121 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1122 | { | |
1123 | const struct trace_syscall_entry *entry; | |
1124 | int iter = 0; | |
1125 | ||
ebcc64cd FD |
1126 | for (entry = sc_table.table; |
1127 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1128 | entry++) { |
1129 | if (iter++ >= *pos) | |
1130 | return entry; | |
1131 | } | |
ebcc64cd FD |
1132 | for (entry = compat_sc_table.table; |
1133 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1134 | entry++) { |
1135 | if (iter++ >= *pos) | |
1136 | return entry; | |
1137 | } | |
1138 | /* End of list */ | |
1139 | return NULL; | |
1140 | } | |
1141 | ||
1142 | static | |
1143 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1144 | { | |
1145 | return (void *) syscall_list_get_entry(pos); | |
1146 | } | |
1147 | ||
1148 | static | |
1149 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1150 | { | |
1151 | (*ppos)++; | |
1152 | return (void *) syscall_list_get_entry(ppos); | |
1153 | } | |
1154 | ||
1155 | static | |
1156 | void syscall_list_stop(struct seq_file *m, void *p) | |
1157 | { | |
1158 | } | |
1159 | ||
12e579db MD |
1160 | static |
1161 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1162 | const struct trace_syscall_entry **table, | |
1163 | unsigned int *bitness) | |
1164 | { | |
ebcc64cd | 1165 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1166 | if (bitness) |
1167 | *bitness = BITS_PER_LONG; | |
1168 | if (table) | |
ebcc64cd | 1169 | *table = sc_table.table; |
12e579db MD |
1170 | return 0; |
1171 | } | |
ebcc64cd FD |
1172 | if (!(entry >= compat_sc_table.table |
1173 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1174 | return -EINVAL; |
1175 | } | |
1176 | if (bitness) | |
1177 | *bitness = 32; | |
1178 | if (table) | |
ebcc64cd | 1179 | *table = compat_sc_table.table; |
12e579db MD |
1180 | return 0; |
1181 | } | |
1182 | ||
2d2464bd MD |
1183 | static |
1184 | int syscall_list_show(struct seq_file *m, void *p) | |
1185 | { | |
1186 | const struct trace_syscall_entry *table, *entry = p; | |
1187 | unsigned int bitness; | |
d4291869 | 1188 | unsigned long index; |
12e579db | 1189 | int ret; |
d4291869 | 1190 | const char *name; |
2d2464bd | 1191 | |
12e579db MD |
1192 | ret = get_sc_table(entry, &table, &bitness); |
1193 | if (ret) | |
1194 | return ret; | |
f4855b46 MD |
1195 | if (!entry->desc) |
1196 | return 0; | |
ebcc64cd | 1197 | if (table == sc_table.table) { |
d4291869 | 1198 | index = entry - table; |
437d5aa5 | 1199 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1200 | } else { |
ebcc64cd | 1201 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1202 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1203 | } |
12e579db | 1204 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1205 | index, name, bitness); |
2d2464bd MD |
1206 | return 0; |
1207 | } | |
1208 | ||
1209 | static | |
1210 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1211 | .start = syscall_list_start, | |
1212 | .next = syscall_list_next, | |
1213 | .stop = syscall_list_stop, | |
1214 | .show = syscall_list_show, | |
1215 | }; | |
1216 | ||
1217 | static | |
1218 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1219 | { | |
1220 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1221 | } | |
1222 | ||
1223 | const struct file_operations lttng_syscall_list_fops = { | |
1224 | .owner = THIS_MODULE, | |
1225 | .open = lttng_syscall_list_open, | |
1226 | .read = seq_read, | |
1227 | .llseek = seq_lseek, | |
1228 | .release = seq_release, | |
1229 | }; | |
12e579db | 1230 | |
badfe9f5 MD |
1231 | /* |
1232 | * A syscall is enabled if it is traced for either entry or exit. | |
1233 | */ | |
c970b655 | 1234 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1235 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1236 | { |
1237 | uint32_t len, sc_tables_len, bitmask_len; | |
1238 | int ret = 0, bit; | |
1239 | char *tmp_mask; | |
1240 | struct lttng_syscall_filter *filter; | |
1241 | ||
1242 | ret = get_user(len, &usyscall_mask->len); | |
1243 | if (ret) | |
1244 | return ret; | |
1245 | sc_tables_len = get_sc_tables_len(); | |
1246 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1247 | if (len < sc_tables_len) { | |
1248 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1249 | } | |
1250 | /* Array is large enough, we can copy array to user-space. */ | |
1251 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1252 | if (!tmp_mask) | |
1253 | return -ENOMEM; | |
0bb716a8 | 1254 | filter = syscall_table->sc_filter; |
12e579db | 1255 | |
ebcc64cd | 1256 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1257 | char state; |
2f25059d | 1258 | |
0bb716a8 MD |
1259 | if (syscall_table->syscall_dispatch) { |
1260 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1261 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1262 | state = test_bit(bit, filter->sc_entry) |
1263 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1264 | else |
1265 | state = 1; | |
1266 | } else { | |
1267 | state = 0; | |
1268 | } | |
1269 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1270 | } |
1271 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1272 | char state; |
2f25059d | 1273 | |
0bb716a8 MD |
1274 | if (syscall_table->compat_syscall_dispatch) { |
1275 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1276 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1277 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1278 | filter->sc_compat_entry) |
ebcc64cd | 1279 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1280 | filter->sc_compat_exit); |
2f25059d MD |
1281 | else |
1282 | state = 1; | |
1283 | } else { | |
1284 | state = 0; | |
1285 | } | |
1286 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1287 | } |
1288 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1289 | ret = -EFAULT; | |
1290 | kfree(tmp_mask); | |
1291 | return ret; | |
1292 | } | |
082d4946 MD |
1293 | |
1294 | int lttng_abi_syscall_list(void) | |
1295 | { | |
1296 | struct file *syscall_list_file; | |
1297 | int file_fd, ret; | |
1298 | ||
2a059b14 | 1299 | file_fd = get_unused_fd_flags(0); |
082d4946 MD |
1300 | if (file_fd < 0) { |
1301 | ret = file_fd; | |
1302 | goto fd_error; | |
1303 | } | |
1304 | ||
1305 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1306 | <tng_syscall_list_fops, | |
1307 | NULL, O_RDWR); | |
1308 | if (IS_ERR(syscall_list_file)) { | |
1309 | ret = PTR_ERR(syscall_list_file); | |
1310 | goto file_error; | |
1311 | } | |
1312 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1313 | if (ret < 0) | |
1314 | goto open_error; | |
1315 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1316 | return file_fd; |
1317 | ||
1318 | open_error: | |
1319 | fput(syscall_list_file); | |
1320 | file_error: | |
1321 | put_unused_fd(file_fd); | |
1322 | fd_error: | |
1323 | return ret; | |
1324 | } |