Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
259b6cb3 MD |
3 | * lttng-syscalls.c |
4 | * | |
2faf7d1b | 5 | * LTTng syscall probes. |
259b6cb3 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
259b6cb3 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
6333ace3 | 12 | #include <linux/compat.h> |
abc0446a | 13 | #include <linux/err.h> |
80f87dd2 | 14 | #include <linux/bitmap.h> |
7ca580f8 MD |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
2d2464bd | 17 | #include <linux/seq_file.h> |
d4291869 | 18 | #include <linux/stringify.h> |
082d4946 MD |
19 | #include <linux/file.h> |
20 | #include <linux/anon_inodes.h> | |
c8dfb724 | 21 | #include <linux/fcntl.h> |
3cf55950 | 22 | #include <linux/mman.h> |
259b6cb3 MD |
23 | #include <asm/ptrace.h> |
24 | #include <asm/syscall.h> | |
25 | ||
a071f25d | 26 | #include <lttng/bitfield.h> |
241ae9a8 MD |
27 | #include <wrapper/tracepoint.h> |
28 | #include <wrapper/file.h> | |
29 | #include <wrapper/rcu.h> | |
1b7b9c65 | 30 | #include <wrapper/syscall.h> |
5987e66c | 31 | #include <wrapper/limits.h> |
2df37e95 | 32 | #include <lttng/events.h> |
6f156b09 | 33 | #include <lttng/events-internal.h> |
8a8ac9a8 | 34 | #include <lttng/utils.h> |
259b6cb3 | 35 | |
ebcc64cd FD |
36 | #include "lttng-syscalls.h" |
37 | ||
6333ace3 | 38 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
39 | # ifndef is_compat_task |
40 | # define is_compat_task() (0) | |
41 | # endif | |
6333ace3 MD |
42 | #endif |
43 | ||
1aa3298b MD |
44 | /* in_compat_syscall appears in kernel 4.6. */ |
45 | #ifndef in_compat_syscall | |
46 | #define in_compat_syscall() is_compat_task() | |
47 | #endif | |
48 | ||
5b7ac358 MD |
49 | enum sc_type { |
50 | SC_TYPE_ENTRY, | |
51 | SC_TYPE_EXIT, | |
52 | SC_TYPE_COMPAT_ENTRY, | |
53 | SC_TYPE_COMPAT_EXIT, | |
54 | }; | |
55 | ||
d4291869 MD |
56 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
57 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
58 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
59 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
60 | ||
61 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
62 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
63 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
64 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 65 | |
2d6d88c6 | 66 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
2d6d88c6 | 67 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 68 | |
80f87dd2 MD |
69 | #ifdef IA32_NR_syscalls |
70 | #define NR_compat_syscalls IA32_NR_syscalls | |
71 | #else | |
72 | #define NR_compat_syscalls NR_syscalls | |
73 | #endif | |
74 | ||
259b6cb3 MD |
75 | /* |
76 | * Create LTTng tracepoint probes. | |
77 | */ | |
78 | #define LTTNG_PACKAGE_BUILD | |
79 | #define CREATE_TRACE_POINTS | |
2655f9ad | 80 | #define TP_MODULE_NOINIT |
c075712b | 81 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 82 | |
a93244f8 MD |
83 | #define PARAMS(args...) args |
84 | ||
5b7ac358 | 85 | /* Handle unknown syscalls */ |
72a52753 | 86 | #undef TRACE_SYSTEM |
5b7ac358 | 87 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 88 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
89 | #undef TRACE_SYSTEM |
90 | ||
5b7ac358 | 91 | #undef TP_PROBE_CB |
fc4f7161 | 92 | |
e42c4f49 FD |
93 | extern const struct trace_syscall_table sc_table; |
94 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 95 | |
2d6d88c6 | 96 | /* Event syscall exit table */ |
e42c4f49 FD |
97 | extern const struct trace_syscall_table sc_exit_table; |
98 | extern const struct trace_syscall_table compat_sc_exit_table; | |
ebcc64cd FD |
99 | |
100 | ||
fc4f7161 MD |
101 | #undef SC_EXIT |
102 | ||
a93244f8 | 103 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 104 | |
80f87dd2 | 105 | struct lttng_syscall_filter { |
badfe9f5 MD |
106 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
107 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
108 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
109 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
7f52f0d4 MD |
110 | |
111 | /* | |
112 | * Reference counters keeping track of number of events enabled | |
113 | * for each bit. | |
114 | */ | |
115 | u32 sc_entry_refcount_map[NR_syscalls]; | |
116 | u32 sc_exit_refcount_map[NR_syscalls]; | |
117 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
118 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
119 | }; |
120 | ||
3b82c4e1 | 121 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 122 | struct pt_regs *regs, long id) |
f405cfce | 123 | { |
1b7b9c65 | 124 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 125 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 126 | |
1b7b9c65 | 127 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 128 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 129 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 130 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 131 | else |
e2d5dbc7 | 132 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
133 | } |
134 | } | |
135 | ||
63aa9160 | 136 | static __always_inline |
e2d5dbc7 | 137 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 138 | void *func, unsigned int nrargs, |
63aa9160 | 139 | struct pt_regs *regs) |
259b6cb3 | 140 | { |
a67ba386 | 141 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 142 | |
63aa9160 | 143 | switch (nrargs) { |
259b6cb3 MD |
144 | case 0: |
145 | { | |
63aa9160 | 146 | void (*fptr)(void *__data) = func; |
259b6cb3 | 147 | |
e2d5dbc7 MD |
148 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
149 | fptr(event_priv->pub); | |
259b6cb3 MD |
150 | break; |
151 | } | |
152 | case 1: | |
153 | { | |
63aa9160 | 154 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 155 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 156 | |
1b7b9c65 | 157 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
158 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
159 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
160 | break; |
161 | } | |
162 | case 2: | |
163 | { | |
164 | void (*fptr)(void *__data, | |
165 | unsigned long arg0, | |
63aa9160 | 166 | unsigned long arg1) = func; |
1b7b9c65 | 167 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 168 | |
1b7b9c65 | 169 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
170 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
171 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
172 | break; |
173 | } | |
174 | case 3: | |
175 | { | |
176 | void (*fptr)(void *__data, | |
177 | unsigned long arg0, | |
178 | unsigned long arg1, | |
63aa9160 | 179 | unsigned long arg2) = func; |
1b7b9c65 | 180 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 181 | |
1b7b9c65 | 182 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
183 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
184 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
185 | break; |
186 | } | |
187 | case 4: | |
188 | { | |
189 | void (*fptr)(void *__data, | |
190 | unsigned long arg0, | |
191 | unsigned long arg1, | |
192 | unsigned long arg2, | |
63aa9160 | 193 | unsigned long arg3) = func; |
1b7b9c65 | 194 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 195 | |
1b7b9c65 | 196 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
197 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
198 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
199 | break; |
200 | } | |
201 | case 5: | |
202 | { | |
203 | void (*fptr)(void *__data, | |
204 | unsigned long arg0, | |
205 | unsigned long arg1, | |
206 | unsigned long arg2, | |
207 | unsigned long arg3, | |
63aa9160 | 208 | unsigned long arg4) = func; |
1b7b9c65 | 209 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 210 | |
1b7b9c65 | 211 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
212 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
213 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
214 | break; |
215 | } | |
216 | case 6: | |
217 | { | |
218 | void (*fptr)(void *__data, | |
219 | unsigned long arg0, | |
220 | unsigned long arg1, | |
221 | unsigned long arg2, | |
222 | unsigned long arg3, | |
223 | unsigned long arg4, | |
63aa9160 | 224 | unsigned long arg5) = func; |
1b7b9c65 | 225 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 226 | |
1b7b9c65 | 227 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
228 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
229 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 230 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
231 | break; |
232 | } | |
233 | default: | |
234 | break; | |
235 | } | |
236 | } | |
237 | ||
63aa9160 FD |
238 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
239 | { | |
0bb716a8 | 240 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 241 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
242 | const struct trace_syscall_entry *table, *entry; |
243 | size_t table_len; | |
244 | ||
245 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 246 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
247 | |
248 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 249 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
250 | /* System call filtered out. */ |
251 | return; | |
252 | } | |
ebcc64cd FD |
253 | table = compat_sc_table.table; |
254 | table_len = compat_sc_table.len; | |
0bb716a8 | 255 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 256 | } else { |
0bb716a8 | 257 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
258 | |
259 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 260 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
261 | /* System call filtered out. */ |
262 | return; | |
263 | } | |
ebcc64cd FD |
264 | table = sc_table.table; |
265 | table_len = sc_table.len; | |
0bb716a8 | 266 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
267 | } |
268 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 269 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
270 | return; |
271 | } | |
3b82c4e1 MD |
272 | |
273 | entry = &table[id]; | |
274 | if (!entry->event_func) { | |
275 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
276 | return; |
277 | } | |
3b82c4e1 MD |
278 | |
279 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 280 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 281 | } else { |
0bb716a8 | 282 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
283 | } |
284 | if (unlikely(hlist_empty(action_list))) | |
285 | return; | |
286 | ||
e2d5dbc7 | 287 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
288 | } |
289 | ||
3b82c4e1 | 290 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 291 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 292 | { |
1b7b9c65 | 293 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 294 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 295 | |
1b7b9c65 | 296 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 297 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 298 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 299 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
300 | args); |
301 | else | |
e2d5dbc7 | 302 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 303 | } |
5b7ac358 MD |
304 | } |
305 | ||
3b82c4e1 | 306 | static __always_inline |
e2d5dbc7 | 307 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
308 | void *func, unsigned int nrargs, |
309 | struct pt_regs *regs, long ret) | |
5b7ac358 | 310 | { |
a67ba386 | 311 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 312 | |
3b82c4e1 | 313 | switch (nrargs) { |
5b7ac358 MD |
314 | case 0: |
315 | { | |
3b82c4e1 | 316 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 317 | |
e2d5dbc7 MD |
318 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
319 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
320 | break; |
321 | } | |
322 | case 1: | |
323 | { | |
324 | void (*fptr)(void *__data, | |
fc4f7161 | 325 | long ret, |
3b82c4e1 | 326 | unsigned long arg0) = func; |
1b7b9c65 | 327 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 328 | |
1b7b9c65 | 329 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
330 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
331 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
332 | break; |
333 | } | |
334 | case 2: | |
335 | { | |
336 | void (*fptr)(void *__data, | |
fc4f7161 | 337 | long ret, |
5b7ac358 | 338 | unsigned long arg0, |
3b82c4e1 | 339 | unsigned long arg1) = func; |
1b7b9c65 | 340 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 341 | |
1b7b9c65 | 342 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
343 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
344 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
345 | break; |
346 | } | |
347 | case 3: | |
348 | { | |
349 | void (*fptr)(void *__data, | |
fc4f7161 | 350 | long ret, |
5b7ac358 MD |
351 | unsigned long arg0, |
352 | unsigned long arg1, | |
3b82c4e1 | 353 | unsigned long arg2) = func; |
1b7b9c65 | 354 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 355 | |
1b7b9c65 | 356 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
357 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
358 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
359 | break; |
360 | } | |
361 | case 4: | |
362 | { | |
363 | void (*fptr)(void *__data, | |
fc4f7161 | 364 | long ret, |
5b7ac358 MD |
365 | unsigned long arg0, |
366 | unsigned long arg1, | |
367 | unsigned long arg2, | |
3b82c4e1 | 368 | unsigned long arg3) = func; |
1b7b9c65 | 369 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 370 | |
1b7b9c65 | 371 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
372 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
373 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
374 | break; |
375 | } | |
376 | case 5: | |
377 | { | |
378 | void (*fptr)(void *__data, | |
fc4f7161 | 379 | long ret, |
5b7ac358 MD |
380 | unsigned long arg0, |
381 | unsigned long arg1, | |
382 | unsigned long arg2, | |
383 | unsigned long arg3, | |
3b82c4e1 | 384 | unsigned long arg4) = func; |
1b7b9c65 | 385 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 386 | |
1b7b9c65 | 387 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
388 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
389 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
390 | break; |
391 | } | |
392 | case 6: | |
393 | { | |
394 | void (*fptr)(void *__data, | |
fc4f7161 | 395 | long ret, |
5b7ac358 MD |
396 | unsigned long arg0, |
397 | unsigned long arg1, | |
398 | unsigned long arg2, | |
399 | unsigned long arg3, | |
400 | unsigned long arg4, | |
3b82c4e1 | 401 | unsigned long arg5) = func; |
1b7b9c65 | 402 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 403 | |
1b7b9c65 | 404 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
405 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
406 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 407 | args[3], args[4], args[5]); |
5b7ac358 MD |
408 | break; |
409 | } | |
410 | default: | |
411 | break; | |
412 | } | |
413 | } | |
414 | ||
3b82c4e1 MD |
415 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
416 | { | |
0bb716a8 | 417 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
418 | struct hlist_head *action_list, *unknown_action_list; |
419 | const struct trace_syscall_entry *table, *entry; | |
420 | size_t table_len; | |
421 | long id; | |
422 | ||
423 | id = syscall_get_nr(current, regs); | |
424 | ||
425 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 426 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
427 | |
428 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 429 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
430 | /* System call filtered out. */ |
431 | return; | |
432 | } | |
ebcc64cd FD |
433 | table = compat_sc_exit_table.table; |
434 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 435 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 436 | } else { |
0bb716a8 | 437 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
438 | |
439 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 440 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
441 | /* System call filtered out. */ |
442 | return; | |
443 | } | |
ebcc64cd FD |
444 | table = sc_exit_table.table; |
445 | table_len = sc_exit_table.len; | |
0bb716a8 | 446 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
447 | } |
448 | if (unlikely(id < 0 || id >= table_len)) { | |
449 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
450 | return; | |
451 | } | |
452 | ||
453 | entry = &table[id]; | |
454 | if (!entry->event_func) { | |
455 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
456 | return; | |
457 | } | |
458 | ||
459 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 460 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 461 | } else { |
0bb716a8 | 462 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
463 | } |
464 | if (unlikely(hlist_empty(action_list))) | |
465 | return; | |
466 | ||
e2d5dbc7 | 467 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
468 | regs, ret); |
469 | } | |
470 | ||
0bb716a8 MD |
471 | static |
472 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 473 | { |
0bb716a8 MD |
474 | switch (event_enabler->enabler_type) { |
475 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
476 | { | |
1ae083ba MD |
477 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
478 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 479 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 480 | } |
0bb716a8 MD |
481 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
482 | { | |
483 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
484 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
485 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 486 | } |
0bb716a8 MD |
487 | default: |
488 | return NULL; | |
8a8ac9a8 | 489 | } |
0bb716a8 | 490 | } |
8a8ac9a8 | 491 | |
0bb716a8 MD |
492 | static |
493 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
494 | { | |
495 | switch (event->type) { | |
496 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
497 | { | |
498 | struct lttng_kernel_event_recorder *event_recorder = | |
499 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
500 | return &event_recorder->chan->priv->parent.syscall_table; | |
501 | } | |
502 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
503 | { | |
504 | struct lttng_kernel_event_notifier *event_notifier = | |
505 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
506 | return &event_notifier->priv->group->syscall_table; | |
507 | } | |
508 | default: | |
509 | return NULL; | |
8a8ac9a8 | 510 | } |
8a8ac9a8 | 511 | } |
0bb716a8 | 512 | |
5408b6d6 MD |
513 | static |
514 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
99903379 | 515 | const struct lttng_kernel_event_desc *desc, enum sc_type type, unsigned int syscall_nr) |
5408b6d6 MD |
516 | { |
517 | struct lttng_kernel_event_common *event; | |
518 | ||
519 | switch (syscall_event_enabler->enabler_type) { | |
520 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
521 | { | |
522 | struct lttng_event_recorder_enabler *syscall_event_recorder_enabler = | |
523 | container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
524 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
525 | struct lttng_kernel_abi_event ev; | |
526 | ||
527 | /* We need to create an event for this syscall/enabler. */ | |
528 | memset(&ev, 0, sizeof(ev)); | |
529 | switch (type) { | |
530 | case SC_TYPE_ENTRY: | |
531 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
532 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
533 | break; | |
534 | case SC_TYPE_EXIT: | |
535 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
536 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
537 | break; | |
538 | case SC_TYPE_COMPAT_ENTRY: | |
539 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
540 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
541 | break; | |
542 | case SC_TYPE_COMPAT_EXIT: | |
543 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
544 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
545 | break; | |
546 | } | |
547 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); | |
548 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
549 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
550 | event_recorder_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, | |
551 | syscall_event_recorder_enabler->chan); | |
552 | WARN_ON_ONCE(!event_recorder_enabler); | |
553 | if (!event_recorder_enabler) | |
554 | return; | |
555 | event = _lttng_kernel_event_create(&event_recorder_enabler->parent, desc); | |
c3fb484e | 556 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 557 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
c3fb484e | 558 | if (IS_ERR(event)) { |
5408b6d6 MD |
559 | printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name); |
560 | return; | |
561 | } | |
9cd106a6 | 562 | event->priv->u.syscall.syscall_id = syscall_nr; |
5408b6d6 MD |
563 | break; |
564 | } | |
565 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
566 | { | |
567 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
568 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
569 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
570 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
571 | uint64_t user_token = syscall_event_enabler->user_token; | |
572 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
573 | ||
574 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
575 | switch (type) { | |
576 | case SC_TYPE_ENTRY: | |
577 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
578 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
579 | break; | |
580 | case SC_TYPE_EXIT: | |
581 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
582 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
583 | break; | |
584 | case SC_TYPE_COMPAT_ENTRY: | |
585 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
586 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
587 | break; | |
588 | case SC_TYPE_COMPAT_EXIT: | |
589 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
590 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
591 | break; | |
592 | } | |
593 | strncat(event_notifier_param.event.name, desc->event_name, | |
594 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
595 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
596 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
597 | event_notifier_param.event.token = user_token; | |
598 | event_notifier_param.error_counter_index = error_counter_index; | |
599 | ||
600 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
601 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
602 | WARN_ON_ONCE(!event_notifier_enabler); | |
603 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); | |
c3fb484e | 604 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 605 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 606 | if (IS_ERR(event)) { |
5408b6d6 MD |
607 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
608 | return; | |
609 | } | |
610 | event->priv->u.syscall.syscall_id = syscall_nr; | |
611 | break; | |
612 | } | |
613 | default: | |
614 | break; | |
615 | } | |
616 | } | |
617 | ||
49c50022 | 618 | static |
67233a18 MD |
619 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
620 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 621 | { |
063f0825 MD |
622 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common); |
623 | const struct lttng_kernel_event_desc *desc; | |
259b6cb3 | 624 | unsigned int i; |
49c50022 | 625 | |
1d303f69 MD |
626 | #ifndef CONFIG_COMPAT |
627 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 628 | return; |
1d303f69 | 629 | #endif |
67233a18 | 630 | /* iterate over all syscall and create event that match */ |
49c50022 | 631 | for (i = 0; i < table_len; i++) { |
19bef247 | 632 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 633 | struct hlist_head *head; |
6768203a | 634 | bool found = false; |
49c50022 | 635 | |
063f0825 | 636 | desc = table[i].desc; |
49c50022 MD |
637 | if (!desc) { |
638 | /* Unknown syscall */ | |
639 | continue; | |
640 | } | |
063f0825 MD |
641 | |
642 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 643 | continue; |
063f0825 | 644 | |
49c50022 | 645 | /* |
3b82c4e1 | 646 | * Check if already created. |
49c50022 | 647 | */ |
0def9170 | 648 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 649 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
6768203a MD |
650 | if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) { |
651 | found = true; | |
652 | break; | |
653 | } | |
3b82c4e1 MD |
654 | } |
655 | if (found) | |
49c50022 | 656 | continue; |
3b82c4e1 | 657 | |
99903379 | 658 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, type, i); |
49c50022 | 659 | } |
49c50022 MD |
660 | } |
661 | ||
552f7c79 MD |
662 | static |
663 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
664 | { | |
665 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
666 | return false; | |
667 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
668 | return false; | |
669 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
670 | return false; | |
671 | if (strcmp(event_enabler->event_param.name, "*")) | |
672 | return false; | |
673 | return true; | |
674 | } | |
675 | ||
9f6f4507 MD |
676 | static |
677 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
678 | { | |
9f6f4507 MD |
679 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
680 | struct lttng_kernel_event_common_private *event_priv; | |
681 | const struct lttng_kernel_event_desc *desc; | |
9f6f4507 MD |
682 | bool found = false; |
683 | struct hlist_head *head; | |
684 | ||
1d303f69 MD |
685 | #ifndef CONFIG_COMPAT |
686 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 687 | return; |
1d303f69 | 688 | #endif |
552f7c79 MD |
689 | /* |
690 | * Considering that currently system calls can only be enabled on a per | |
691 | * name basis (or wildcard based on a name), unknown syscall events are | |
692 | * only used when matching *all* system calls, because this is the only | |
693 | * case which can be associated with an unknown system call. | |
694 | * | |
695 | * When enabling system call on a per system call number basis will be | |
696 | * supported, this will need to be revisited. | |
697 | */ | |
698 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
699 | return; | |
700 | ||
9f6f4507 MD |
701 | switch (type) { |
702 | case SC_TYPE_ENTRY: | |
703 | desc = &__event_desc___syscall_entry_unknown; | |
9f6f4507 MD |
704 | break; |
705 | case SC_TYPE_EXIT: | |
706 | desc = &__event_desc___syscall_exit_unknown; | |
9f6f4507 MD |
707 | break; |
708 | case SC_TYPE_COMPAT_ENTRY: | |
709 | desc = &__event_desc___compat_syscall_entry_unknown; | |
9f6f4507 MD |
710 | break; |
711 | case SC_TYPE_COMPAT_EXIT: | |
712 | desc = &__event_desc___compat_syscall_exit_unknown; | |
9f6f4507 MD |
713 | break; |
714 | default: | |
715 | WARN_ON_ONCE(1); | |
716 | } | |
717 | ||
718 | /* | |
719 | * Check if already created. | |
720 | */ | |
721 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); | |
722 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { | |
6768203a | 723 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
9f6f4507 | 724 | found = true; |
6768203a MD |
725 | break; |
726 | } | |
9f6f4507 MD |
727 | } |
728 | if (!found) | |
99903379 | 729 | lttng_syscall_event_enabler_create_event(event_enabler, desc, type, -1U); |
9f6f4507 MD |
730 | } |
731 | ||
d26015f6 | 732 | static |
15a00134 | 733 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 734 | { |
15a00134 | 735 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 736 | |
15a00134 MD |
737 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
738 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
739 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
740 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
741 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
742 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
743 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
744 | } | |
1ab4126a | 745 | |
15a00134 MD |
746 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
747 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
748 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
749 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
750 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
751 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
752 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
753 | } | |
259b6cb3 MD |
754 | } |
755 | ||
756 | /* | |
8a8ac9a8 FD |
757 | * Should be called with sessions lock held. |
758 | */ | |
b2f63bde | 759 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 760 | { |
d26015f6 MD |
761 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
762 | int ret; | |
8a8ac9a8 | 763 | |
0bb716a8 | 764 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 765 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
766 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
767 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 768 | return -ENOMEM; |
8a8ac9a8 | 769 | } |
0bb716a8 | 770 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
771 | /* create syscall table mapping syscall to events */ |
772 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 773 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 774 | return -ENOMEM; |
8a8ac9a8 FD |
775 | } |
776 | ||
777 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 778 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 779 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
780 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
781 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 782 | return -ENOMEM; |
8a8ac9a8 FD |
783 | } |
784 | ||
0bb716a8 | 785 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
786 | /* create syscall table mapping compat syscall to events */ |
787 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 788 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 789 | return -ENOMEM; |
8a8ac9a8 FD |
790 | } |
791 | #endif | |
0bb716a8 MD |
792 | if (!syscall_table->sc_filter) { |
793 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 794 | GFP_KERNEL); |
0bb716a8 | 795 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
796 | return -ENOMEM; |
797 | } | |
798 | ||
0bb716a8 | 799 | if (!syscall_table->sys_enter_registered) { |
8a8ac9a8 | 800 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 801 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
802 | if (ret) |
803 | return ret; | |
0bb716a8 | 804 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 805 | } |
0bb716a8 | 806 | if (!syscall_table->sys_exit_registered) { |
8a8ac9a8 | 807 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 808 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 FD |
809 | if (ret) { |
810 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 811 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
812 | return ret; |
813 | } | |
0bb716a8 | 814 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 815 | } |
0fab709d | 816 | |
86e12a51 MD |
817 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
818 | ||
fad51c94 | 819 | return 0; |
8a8ac9a8 FD |
820 | } |
821 | ||
6053e75e | 822 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
823 | { |
824 | int ret; | |
825 | ||
0bb716a8 | 826 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 827 | return 0; |
0bb716a8 | 828 | if (syscall_table->sys_enter_registered) { |
2d9cd7f3 | 829 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 830 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
831 | if (ret) |
832 | return ret; | |
0bb716a8 | 833 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 834 | } |
0bb716a8 | 835 | if (syscall_table->sys_exit_registered) { |
2d9cd7f3 | 836 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 837 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
838 | if (ret) |
839 | return ret; | |
0bb716a8 | 840 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 841 | } |
badfe9f5 MD |
842 | return 0; |
843 | } | |
844 | ||
6053e75e | 845 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 846 | { |
0bb716a8 MD |
847 | kfree(syscall_table->syscall_dispatch); |
848 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 849 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
850 | kfree(syscall_table->compat_syscall_dispatch); |
851 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 852 | #endif |
0bb716a8 | 853 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
854 | return 0; |
855 | } | |
856 | ||
12e579db MD |
857 | static |
858 | uint32_t get_sc_tables_len(void) | |
859 | { | |
ebcc64cd | 860 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
861 | } |
862 | ||
badfe9f5 | 863 | static |
ade8a729 FD |
864 | const char *get_syscall_name(const char *desc_name, |
865 | enum lttng_syscall_abi abi, | |
866 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 867 | { |
badfe9f5 | 868 | size_t prefix_len = 0; |
80f87dd2 | 869 | |
80f87dd2 | 870 | |
ade8a729 | 871 | switch (entryexit) { |
badfe9f5 | 872 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 873 | switch (abi) { |
badfe9f5 MD |
874 | case LTTNG_SYSCALL_ABI_NATIVE: |
875 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
876 | break; | |
877 | case LTTNG_SYSCALL_ABI_COMPAT: | |
878 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
879 | break; | |
80f87dd2 | 880 | } |
badfe9f5 MD |
881 | break; |
882 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 883 | switch (abi) { |
badfe9f5 MD |
884 | case LTTNG_SYSCALL_ABI_NATIVE: |
885 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
886 | break; | |
887 | case LTTNG_SYSCALL_ABI_COMPAT: | |
888 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
889 | break; | |
80f87dd2 | 890 | } |
badfe9f5 | 891 | break; |
80f87dd2 | 892 | } |
badfe9f5 | 893 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 894 | return desc_name + prefix_len; |
badfe9f5 MD |
895 | } |
896 | ||
ade8a729 FD |
897 | static |
898 | int lttng_syscall_filter_enable( | |
899 | struct lttng_syscall_filter *filter, | |
900 | const char *desc_name, enum lttng_syscall_abi abi, | |
99903379 MD |
901 | enum lttng_syscall_entryexit entryexit, |
902 | unsigned int syscall_id) | |
badfe9f5 | 903 | { |
badfe9f5 MD |
904 | const char *syscall_name; |
905 | unsigned long *bitmap; | |
7f52f0d4 | 906 | u32 *refcount_map; |
badfe9f5 | 907 | |
ade8a729 | 908 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 909 | |
ade8a729 | 910 | switch (entryexit) { |
badfe9f5 | 911 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 912 | switch (abi) { |
badfe9f5 MD |
913 | case LTTNG_SYSCALL_ABI_NATIVE: |
914 | bitmap = filter->sc_entry; | |
7f52f0d4 | 915 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
916 | break; |
917 | case LTTNG_SYSCALL_ABI_COMPAT: | |
918 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 919 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 920 | break; |
6d9694d8 MD |
921 | default: |
922 | return -EINVAL; | |
80f87dd2 | 923 | } |
badfe9f5 MD |
924 | break; |
925 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 926 | switch (abi) { |
badfe9f5 MD |
927 | case LTTNG_SYSCALL_ABI_NATIVE: |
928 | bitmap = filter->sc_exit; | |
7f52f0d4 | 929 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
930 | break; |
931 | case LTTNG_SYSCALL_ABI_COMPAT: | |
932 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 933 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 934 | break; |
6d9694d8 MD |
935 | default: |
936 | return -EINVAL; | |
80f87dd2 | 937 | } |
badfe9f5 MD |
938 | break; |
939 | default: | |
940 | return -EINVAL; | |
80f87dd2 | 941 | } |
99903379 | 942 | if (refcount_map[syscall_id] == U32_MAX) |
7f52f0d4 | 943 | return -EOVERFLOW; |
99903379 MD |
944 | if (refcount_map[syscall_id]++ == 0) |
945 | bitmap_set(bitmap, syscall_id, 1); | |
80f87dd2 | 946 | return 0; |
80f87dd2 MD |
947 | } |
948 | ||
9b2f1c54 | 949 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 950 | { |
9b2f1c54 | 951 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
952 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
953 | struct hlist_head *dispatch_list; | |
ca62543e | 954 | int ret = 0; |
8a8ac9a8 | 955 | |
9b2f1c54 | 956 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 957 | |
99903379 MD |
958 | /* Unknown syscall */ |
959 | if (syscall_id == -1U) { | |
960 | switch (event->priv->u.syscall.entryexit) { | |
961 | case LTTNG_SYSCALL_ENTRY: | |
962 | switch (event->priv->u.syscall.abi) { | |
963 | case LTTNG_SYSCALL_ABI_NATIVE: | |
964 | dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
965 | break; | |
966 | case LTTNG_SYSCALL_ABI_COMPAT: | |
967 | dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
968 | break; | |
969 | default: | |
970 | ret = -EINVAL; | |
971 | goto end; | |
972 | } | |
9cd106a6 | 973 | break; |
99903379 MD |
974 | case LTTNG_SYSCALL_EXIT: |
975 | switch (event->priv->u.syscall.abi) { | |
976 | case LTTNG_SYSCALL_ABI_NATIVE: | |
977 | dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
978 | break; | |
979 | case LTTNG_SYSCALL_ABI_COMPAT: | |
980 | dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
981 | break; | |
982 | default: | |
983 | ret = -EINVAL; | |
984 | goto end; | |
985 | } | |
9cd106a6 MD |
986 | break; |
987 | default: | |
988 | ret = -EINVAL; | |
989 | goto end; | |
990 | } | |
99903379 MD |
991 | } else { |
992 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, | |
993 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
994 | event->priv->u.syscall.entryexit, syscall_id); | |
995 | if (ret) | |
996 | return ret; | |
997 | ||
998 | switch (event->priv->u.syscall.entryexit) { | |
999 | case LTTNG_SYSCALL_ENTRY: | |
1000 | switch (event->priv->u.syscall.abi) { | |
1001 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1002 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1003 | break; | |
1004 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1005 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1006 | break; | |
1007 | default: | |
1008 | ret = -EINVAL; | |
1009 | goto end; | |
1010 | } | |
8a8ac9a8 | 1011 | break; |
99903379 MD |
1012 | case LTTNG_SYSCALL_EXIT: |
1013 | switch (event->priv->u.syscall.abi) { | |
1014 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1015 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1016 | break; | |
1017 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1018 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1019 | break; | |
1020 | default: | |
1021 | ret = -EINVAL; | |
1022 | goto end; | |
1023 | } | |
8a8ac9a8 | 1024 | break; |
6866b1c7 MJ |
1025 | default: |
1026 | ret = -EINVAL; | |
1027 | goto end; | |
8a8ac9a8 | 1028 | } |
8a8ac9a8 | 1029 | } |
9cd106a6 MD |
1030 | |
1031 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1032 | end: |
9b2f1c54 | 1033 | return ret; |
ade8a729 FD |
1034 | } |
1035 | ||
1036 | static | |
f2db8be3 | 1037 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 | 1038 | const char *desc_name, enum lttng_syscall_abi abi, |
99903379 MD |
1039 | enum lttng_syscall_entryexit entryexit, |
1040 | unsigned int syscall_id) | |
ade8a729 | 1041 | { |
badfe9f5 MD |
1042 | const char *syscall_name; |
1043 | unsigned long *bitmap; | |
7f52f0d4 | 1044 | u32 *refcount_map; |
80f87dd2 | 1045 | |
ade8a729 | 1046 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1047 | |
ade8a729 | 1048 | switch (entryexit) { |
badfe9f5 | 1049 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1050 | switch (abi) { |
badfe9f5 MD |
1051 | case LTTNG_SYSCALL_ABI_NATIVE: |
1052 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1053 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1054 | break; |
1055 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1056 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1057 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1058 | break; |
6d9694d8 MD |
1059 | default: |
1060 | return -EINVAL; | |
80f87dd2 | 1061 | } |
badfe9f5 MD |
1062 | break; |
1063 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1064 | switch (abi) { |
badfe9f5 MD |
1065 | case LTTNG_SYSCALL_ABI_NATIVE: |
1066 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1067 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1068 | break; |
1069 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1070 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1071 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1072 | break; |
6d9694d8 MD |
1073 | default: |
1074 | return -EINVAL; | |
80f87dd2 | 1075 | } |
badfe9f5 MD |
1076 | break; |
1077 | default: | |
1078 | return -EINVAL; | |
80f87dd2 | 1079 | } |
99903379 | 1080 | if (refcount_map[syscall_id] == 0) |
7f52f0d4 | 1081 | return -ENOENT; |
99903379 MD |
1082 | if (--refcount_map[syscall_id] == 0) |
1083 | bitmap_clear(bitmap, syscall_id, 1); | |
badfe9f5 | 1084 | return 0; |
259b6cb3 | 1085 | } |
2d2464bd | 1086 | |
9b2f1c54 | 1087 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1088 | { |
9b2f1c54 | 1089 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
7f52f0d4 | 1090 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
8a8ac9a8 FD |
1091 | int ret; |
1092 | ||
99903379 MD |
1093 | /* Except for unknown syscall */ |
1094 | if (syscall_id != -1U) { | |
1095 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, | |
1096 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1097 | event->priv->u.syscall.entryexit, syscall_id); | |
1098 | if (ret) | |
1099 | return ret; | |
1100 | } | |
9cd106a6 | 1101 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1102 | return 0; |
1103 | } | |
1104 | ||
9cb5be7e MD |
1105 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1106 | { | |
1107 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1108 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1109 | int enabled = event_enabler->enabled; | |
1110 | ||
552f7c79 | 1111 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1112 | return; |
9cb5be7e MD |
1113 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1114 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1115 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1116 | ||
1117 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1118 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1119 | } | |
1120 | ||
2d2464bd MD |
1121 | static |
1122 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1123 | { | |
1124 | const struct trace_syscall_entry *entry; | |
1125 | int iter = 0; | |
1126 | ||
ebcc64cd FD |
1127 | for (entry = sc_table.table; |
1128 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1129 | entry++) { |
1130 | if (iter++ >= *pos) | |
1131 | return entry; | |
1132 | } | |
ebcc64cd FD |
1133 | for (entry = compat_sc_table.table; |
1134 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1135 | entry++) { |
1136 | if (iter++ >= *pos) | |
1137 | return entry; | |
1138 | } | |
1139 | /* End of list */ | |
1140 | return NULL; | |
1141 | } | |
1142 | ||
1143 | static | |
1144 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1145 | { | |
1146 | return (void *) syscall_list_get_entry(pos); | |
1147 | } | |
1148 | ||
1149 | static | |
1150 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1151 | { | |
1152 | (*ppos)++; | |
1153 | return (void *) syscall_list_get_entry(ppos); | |
1154 | } | |
1155 | ||
1156 | static | |
1157 | void syscall_list_stop(struct seq_file *m, void *p) | |
1158 | { | |
1159 | } | |
1160 | ||
12e579db MD |
1161 | static |
1162 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1163 | const struct trace_syscall_entry **table, | |
1164 | unsigned int *bitness) | |
1165 | { | |
ebcc64cd | 1166 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1167 | if (bitness) |
1168 | *bitness = BITS_PER_LONG; | |
1169 | if (table) | |
ebcc64cd | 1170 | *table = sc_table.table; |
12e579db MD |
1171 | return 0; |
1172 | } | |
ebcc64cd FD |
1173 | if (!(entry >= compat_sc_table.table |
1174 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1175 | return -EINVAL; |
1176 | } | |
1177 | if (bitness) | |
1178 | *bitness = 32; | |
1179 | if (table) | |
ebcc64cd | 1180 | *table = compat_sc_table.table; |
12e579db MD |
1181 | return 0; |
1182 | } | |
1183 | ||
2d2464bd MD |
1184 | static |
1185 | int syscall_list_show(struct seq_file *m, void *p) | |
1186 | { | |
1187 | const struct trace_syscall_entry *table, *entry = p; | |
1188 | unsigned int bitness; | |
d4291869 | 1189 | unsigned long index; |
12e579db | 1190 | int ret; |
d4291869 | 1191 | const char *name; |
2d2464bd | 1192 | |
12e579db MD |
1193 | ret = get_sc_table(entry, &table, &bitness); |
1194 | if (ret) | |
1195 | return ret; | |
f4855b46 MD |
1196 | if (!entry->desc) |
1197 | return 0; | |
ebcc64cd | 1198 | if (table == sc_table.table) { |
d4291869 | 1199 | index = entry - table; |
437d5aa5 | 1200 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1201 | } else { |
ebcc64cd | 1202 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1203 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1204 | } |
12e579db | 1205 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1206 | index, name, bitness); |
2d2464bd MD |
1207 | return 0; |
1208 | } | |
1209 | ||
1210 | static | |
1211 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1212 | .start = syscall_list_start, | |
1213 | .next = syscall_list_next, | |
1214 | .stop = syscall_list_stop, | |
1215 | .show = syscall_list_show, | |
1216 | }; | |
1217 | ||
1218 | static | |
1219 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1220 | { | |
1221 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1222 | } | |
1223 | ||
1224 | const struct file_operations lttng_syscall_list_fops = { | |
1225 | .owner = THIS_MODULE, | |
1226 | .open = lttng_syscall_list_open, | |
1227 | .read = seq_read, | |
1228 | .llseek = seq_lseek, | |
1229 | .release = seq_release, | |
1230 | }; | |
12e579db | 1231 | |
badfe9f5 MD |
1232 | /* |
1233 | * A syscall is enabled if it is traced for either entry or exit. | |
1234 | */ | |
c970b655 | 1235 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1236 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1237 | { |
1238 | uint32_t len, sc_tables_len, bitmask_len; | |
1239 | int ret = 0, bit; | |
1240 | char *tmp_mask; | |
1241 | struct lttng_syscall_filter *filter; | |
1242 | ||
1243 | ret = get_user(len, &usyscall_mask->len); | |
1244 | if (ret) | |
1245 | return ret; | |
1246 | sc_tables_len = get_sc_tables_len(); | |
1247 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1248 | if (len < sc_tables_len) { | |
1249 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1250 | } | |
1251 | /* Array is large enough, we can copy array to user-space. */ | |
1252 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1253 | if (!tmp_mask) | |
1254 | return -ENOMEM; | |
0bb716a8 | 1255 | filter = syscall_table->sc_filter; |
12e579db | 1256 | |
ebcc64cd | 1257 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1258 | char state; |
2f25059d | 1259 | |
0bb716a8 MD |
1260 | if (syscall_table->syscall_dispatch) { |
1261 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1262 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1263 | state = test_bit(bit, filter->sc_entry) |
1264 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1265 | else |
1266 | state = 1; | |
1267 | } else { | |
1268 | state = 0; | |
1269 | } | |
1270 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1271 | } |
1272 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1273 | char state; |
2f25059d | 1274 | |
0bb716a8 MD |
1275 | if (syscall_table->compat_syscall_dispatch) { |
1276 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1277 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1278 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1279 | filter->sc_compat_entry) |
ebcc64cd | 1280 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1281 | filter->sc_compat_exit); |
2f25059d MD |
1282 | else |
1283 | state = 1; | |
1284 | } else { | |
1285 | state = 0; | |
1286 | } | |
1287 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1288 | } |
1289 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1290 | ret = -EFAULT; | |
1291 | kfree(tmp_mask); | |
1292 | return ret; | |
1293 | } | |
082d4946 MD |
1294 | |
1295 | int lttng_abi_syscall_list(void) | |
1296 | { | |
1297 | struct file *syscall_list_file; | |
1298 | int file_fd, ret; | |
1299 | ||
4ac10b76 | 1300 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1301 | if (file_fd < 0) { |
1302 | ret = file_fd; | |
1303 | goto fd_error; | |
1304 | } | |
1305 | ||
1306 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1307 | <tng_syscall_list_fops, | |
1308 | NULL, O_RDWR); | |
1309 | if (IS_ERR(syscall_list_file)) { | |
1310 | ret = PTR_ERR(syscall_list_file); | |
1311 | goto file_error; | |
1312 | } | |
1313 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1314 | if (ret < 0) | |
1315 | goto open_error; | |
1316 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1317 | return file_fd; |
1318 | ||
1319 | open_error: | |
1320 | fput(syscall_list_file); | |
1321 | file_error: | |
1322 | put_unused_fd(file_fd); | |
1323 | fd_error: | |
1324 | return ret; | |
1325 | } |