Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
259b6cb3 MD |
3 | * lttng-syscalls.c |
4 | * | |
2faf7d1b | 5 | * LTTng syscall probes. |
259b6cb3 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
259b6cb3 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
6333ace3 | 12 | #include <linux/compat.h> |
abc0446a | 13 | #include <linux/err.h> |
80f87dd2 | 14 | #include <linux/bitmap.h> |
7ca580f8 MD |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
2d2464bd | 17 | #include <linux/seq_file.h> |
d4291869 | 18 | #include <linux/stringify.h> |
082d4946 MD |
19 | #include <linux/file.h> |
20 | #include <linux/anon_inodes.h> | |
c8dfb724 | 21 | #include <linux/fcntl.h> |
3cf55950 | 22 | #include <linux/mman.h> |
259b6cb3 MD |
23 | #include <asm/ptrace.h> |
24 | #include <asm/syscall.h> | |
25 | ||
a071f25d | 26 | #include <lttng/bitfield.h> |
241ae9a8 MD |
27 | #include <wrapper/tracepoint.h> |
28 | #include <wrapper/file.h> | |
29 | #include <wrapper/rcu.h> | |
1b7b9c65 | 30 | #include <wrapper/syscall.h> |
2df37e95 | 31 | #include <lttng/events.h> |
1ea8aa0a | 32 | #include <lttng/events-internal.h> |
8a8ac9a8 | 33 | #include <lttng/utils.h> |
259b6cb3 | 34 | |
f385fc5f 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 | |
8a8ac9a8 FD |
68 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
69 | long id); | |
8a8ac9a8 FD |
70 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, |
71 | long ret); | |
72 | ||
3a523f5b MD |
73 | /* |
74 | * Forward declarations for old kernels. | |
75 | */ | |
76 | struct mmsghdr; | |
77 | struct rlimit64; | |
78 | struct oldold_utsname; | |
79 | struct old_utsname; | |
80 | struct sel_arg_struct; | |
81 | struct mmap_arg_struct; | |
c0b71117 | 82 | struct file_handle; |
a292e6f1 | 83 | struct user_msghdr; |
3a523f5b | 84 | |
9eb15e8b MJ |
85 | /* |
86 | * Forward declaration for kernels >= 5.6 | |
87 | */ | |
88 | struct timex; | |
edfdcb68 MJ |
89 | struct timeval; |
90 | struct itimerval; | |
91 | struct itimerspec; | |
92 | ||
5f4c791e | 93 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
94 | typedef __kernel_old_time_t time_t; |
95 | #endif | |
9eb15e8b | 96 | |
80f87dd2 MD |
97 | #ifdef IA32_NR_syscalls |
98 | #define NR_compat_syscalls IA32_NR_syscalls | |
99 | #else | |
100 | #define NR_compat_syscalls NR_syscalls | |
101 | #endif | |
102 | ||
259b6cb3 MD |
103 | /* |
104 | * Create LTTng tracepoint probes. | |
105 | */ | |
106 | #define LTTNG_PACKAGE_BUILD | |
107 | #define CREATE_TRACE_POINTS | |
2655f9ad | 108 | #define TP_MODULE_NOINIT |
c075712b | 109 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 110 | |
a93244f8 MD |
111 | #define PARAMS(args...) args |
112 | ||
5b7ac358 | 113 | /* Handle unknown syscalls */ |
72a52753 | 114 | #undef TRACE_SYSTEM |
5b7ac358 | 115 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 116 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
117 | #undef TRACE_SYSTEM |
118 | ||
5b7ac358 | 119 | #undef TP_PROBE_CB |
fc4f7161 | 120 | |
5bcf4dbd FD |
121 | extern const struct trace_syscall_table sc_table; |
122 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 123 | |
2d6d88c6 | 124 | /* Event syscall exit table */ |
5bcf4dbd FD |
125 | extern const struct trace_syscall_table sc_exit_table; |
126 | extern const struct trace_syscall_table compat_sc_exit_table; | |
f385fc5f FD |
127 | |
128 | ||
fc4f7161 MD |
129 | #undef SC_EXIT |
130 | ||
a93244f8 | 131 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 132 | |
80f87dd2 | 133 | struct lttng_syscall_filter { |
badfe9f5 MD |
134 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
135 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
136 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
137 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
138 | }; |
139 | ||
3b82c4e1 | 140 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 141 | struct pt_regs *regs, long id) |
f405cfce | 142 | { |
1b7b9c65 | 143 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 144 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 145 | |
1b7b9c65 | 146 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 147 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 148 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 149 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 150 | else |
e2d5dbc7 | 151 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
152 | } |
153 | } | |
154 | ||
63aa9160 | 155 | static __always_inline |
e2d5dbc7 | 156 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 157 | void *func, unsigned int nrargs, |
63aa9160 | 158 | struct pt_regs *regs) |
259b6cb3 | 159 | { |
a67ba386 | 160 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 161 | |
63aa9160 | 162 | switch (nrargs) { |
259b6cb3 MD |
163 | case 0: |
164 | { | |
63aa9160 | 165 | void (*fptr)(void *__data) = func; |
259b6cb3 | 166 | |
e2d5dbc7 MD |
167 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
168 | fptr(event_priv->pub); | |
259b6cb3 MD |
169 | break; |
170 | } | |
171 | case 1: | |
172 | { | |
63aa9160 | 173 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 174 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 175 | |
1b7b9c65 | 176 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
177 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
178 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
179 | break; |
180 | } | |
181 | case 2: | |
182 | { | |
183 | void (*fptr)(void *__data, | |
184 | unsigned long arg0, | |
63aa9160 | 185 | unsigned long arg1) = func; |
1b7b9c65 | 186 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 187 | |
1b7b9c65 | 188 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
189 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
190 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
191 | break; |
192 | } | |
193 | case 3: | |
194 | { | |
195 | void (*fptr)(void *__data, | |
196 | unsigned long arg0, | |
197 | unsigned long arg1, | |
63aa9160 | 198 | unsigned long arg2) = func; |
1b7b9c65 | 199 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 200 | |
1b7b9c65 | 201 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
202 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
203 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
204 | break; |
205 | } | |
206 | case 4: | |
207 | { | |
208 | void (*fptr)(void *__data, | |
209 | unsigned long arg0, | |
210 | unsigned long arg1, | |
211 | unsigned long arg2, | |
63aa9160 | 212 | unsigned long arg3) = func; |
1b7b9c65 | 213 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 214 | |
1b7b9c65 | 215 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
216 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
217 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
218 | break; |
219 | } | |
220 | case 5: | |
221 | { | |
222 | void (*fptr)(void *__data, | |
223 | unsigned long arg0, | |
224 | unsigned long arg1, | |
225 | unsigned long arg2, | |
226 | unsigned long arg3, | |
63aa9160 | 227 | unsigned long arg4) = func; |
1b7b9c65 | 228 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 229 | |
1b7b9c65 | 230 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
231 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
232 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
233 | break; |
234 | } | |
235 | case 6: | |
236 | { | |
237 | void (*fptr)(void *__data, | |
238 | unsigned long arg0, | |
239 | unsigned long arg1, | |
240 | unsigned long arg2, | |
241 | unsigned long arg3, | |
242 | unsigned long arg4, | |
63aa9160 | 243 | unsigned long arg5) = func; |
1b7b9c65 | 244 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 245 | |
1b7b9c65 | 246 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
247 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
248 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 249 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
250 | break; |
251 | } | |
252 | default: | |
253 | break; | |
254 | } | |
255 | } | |
256 | ||
63aa9160 FD |
257 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
258 | { | |
259 | struct lttng_channel *chan = __data; | |
3b82c4e1 | 260 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
261 | const struct trace_syscall_entry *table, *entry; |
262 | size_t table_len; | |
263 | ||
264 | if (unlikely(in_compat_syscall())) { | |
265 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
266 | ||
267 | if (id < 0 || id >= NR_compat_syscalls | |
3b82c4e1 | 268 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
269 | /* System call filtered out. */ |
270 | return; | |
271 | } | |
f385fc5f FD |
272 | table = compat_sc_table.table; |
273 | table_len = compat_sc_table.len; | |
3b82c4e1 | 274 | unknown_action_list = &chan->sc_compat_unknown; |
63aa9160 FD |
275 | } else { |
276 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
277 | ||
278 | if (id < 0 || id >= NR_syscalls | |
3b82c4e1 | 279 | || (!READ_ONCE(chan->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
280 | /* System call filtered out. */ |
281 | return; | |
282 | } | |
f385fc5f FD |
283 | table = sc_table.table; |
284 | table_len = sc_table.len; | |
3b82c4e1 | 285 | unknown_action_list = &chan->sc_unknown; |
63aa9160 FD |
286 | } |
287 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 288 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
289 | return; |
290 | } | |
3b82c4e1 MD |
291 | |
292 | entry = &table[id]; | |
293 | if (!entry->event_func) { | |
294 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
295 | return; |
296 | } | |
3b82c4e1 MD |
297 | |
298 | if (unlikely(in_compat_syscall())) { | |
299 | action_list = &chan->compat_sc_table[id]; | |
300 | } else { | |
301 | action_list = &chan->sc_table[id]; | |
302 | } | |
303 | if (unlikely(hlist_empty(action_list))) | |
304 | return; | |
305 | ||
e2d5dbc7 | 306 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
307 | } |
308 | ||
8a8ac9a8 FD |
309 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
310 | long id) | |
311 | { | |
312 | struct lttng_event_notifier_group *group = __data; | |
313 | const struct trace_syscall_entry *table, *entry; | |
314 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
315 | size_t table_len; | |
316 | ||
317 | if (unlikely(in_compat_syscall())) { | |
318 | struct lttng_syscall_filter *filter = group->sc_filter; | |
319 | ||
320 | if (id < 0 || id >= NR_compat_syscalls | |
321 | || (!READ_ONCE(group->syscall_all_entry) && | |
322 | !test_bit(id, filter->sc_compat_entry))) { | |
323 | /* System call filtered out. */ | |
324 | return; | |
325 | } | |
f385fc5f FD |
326 | table = compat_sc_table.table; |
327 | table_len = compat_sc_table.len; | |
8a8ac9a8 FD |
328 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; |
329 | } else { | |
330 | struct lttng_syscall_filter *filter = group->sc_filter; | |
331 | ||
332 | if (id < 0 || id >= NR_syscalls | |
333 | || (!READ_ONCE(group->syscall_all_entry) && | |
334 | !test_bit(id, filter->sc_entry))) { | |
335 | /* System call filtered out. */ | |
336 | return; | |
337 | } | |
f385fc5f FD |
338 | table = sc_table.table; |
339 | table_len = sc_table.len; | |
8a8ac9a8 FD |
340 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; |
341 | } | |
342 | /* Check if the syscall id is out of bound. */ | |
343 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 344 | syscall_entry_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
345 | regs, id); |
346 | return; | |
347 | } | |
348 | ||
349 | entry = &table[id]; | |
e2d5dbc7 MD |
350 | if (!entry->event_func) { |
351 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
352 | regs, id); |
353 | return; | |
354 | } | |
355 | ||
356 | if (unlikely(in_compat_syscall())) { | |
357 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
358 | } else { | |
359 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
360 | } | |
361 | if (unlikely(hlist_empty(dispatch_list))) | |
362 | return; | |
363 | ||
e2d5dbc7 MD |
364 | syscall_entry_event_call_func(dispatch_list, |
365 | entry->event_func, entry->nrargs, regs); | |
8a8ac9a8 FD |
366 | } |
367 | ||
3b82c4e1 | 368 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 369 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 370 | { |
1b7b9c65 | 371 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 372 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 373 | |
1b7b9c65 | 374 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 375 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 376 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 377 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
378 | args); |
379 | else | |
e2d5dbc7 | 380 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 381 | } |
5b7ac358 MD |
382 | } |
383 | ||
3b82c4e1 | 384 | static __always_inline |
e2d5dbc7 | 385 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
386 | void *func, unsigned int nrargs, |
387 | struct pt_regs *regs, long ret) | |
5b7ac358 | 388 | { |
a67ba386 | 389 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 390 | |
3b82c4e1 | 391 | switch (nrargs) { |
5b7ac358 MD |
392 | case 0: |
393 | { | |
3b82c4e1 | 394 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 395 | |
e2d5dbc7 MD |
396 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
397 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
398 | break; |
399 | } | |
400 | case 1: | |
401 | { | |
402 | void (*fptr)(void *__data, | |
fc4f7161 | 403 | long ret, |
3b82c4e1 | 404 | unsigned long arg0) = func; |
1b7b9c65 | 405 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 406 | |
1b7b9c65 | 407 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
408 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
409 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
410 | break; |
411 | } | |
412 | case 2: | |
413 | { | |
414 | void (*fptr)(void *__data, | |
fc4f7161 | 415 | long ret, |
5b7ac358 | 416 | unsigned long arg0, |
3b82c4e1 | 417 | unsigned long arg1) = func; |
1b7b9c65 | 418 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 419 | |
1b7b9c65 | 420 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
421 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
422 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
423 | break; |
424 | } | |
425 | case 3: | |
426 | { | |
427 | void (*fptr)(void *__data, | |
fc4f7161 | 428 | long ret, |
5b7ac358 MD |
429 | unsigned long arg0, |
430 | unsigned long arg1, | |
3b82c4e1 | 431 | unsigned long arg2) = func; |
1b7b9c65 | 432 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 433 | |
1b7b9c65 | 434 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
435 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
436 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
437 | break; |
438 | } | |
439 | case 4: | |
440 | { | |
441 | void (*fptr)(void *__data, | |
fc4f7161 | 442 | long ret, |
5b7ac358 MD |
443 | unsigned long arg0, |
444 | unsigned long arg1, | |
445 | unsigned long arg2, | |
3b82c4e1 | 446 | unsigned long arg3) = func; |
1b7b9c65 | 447 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 448 | |
1b7b9c65 | 449 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
450 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
451 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
452 | break; |
453 | } | |
454 | case 5: | |
455 | { | |
456 | void (*fptr)(void *__data, | |
fc4f7161 | 457 | long ret, |
5b7ac358 MD |
458 | unsigned long arg0, |
459 | unsigned long arg1, | |
460 | unsigned long arg2, | |
461 | unsigned long arg3, | |
3b82c4e1 | 462 | unsigned long arg4) = func; |
1b7b9c65 | 463 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 464 | |
1b7b9c65 | 465 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
466 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
467 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
468 | break; |
469 | } | |
470 | case 6: | |
471 | { | |
472 | void (*fptr)(void *__data, | |
fc4f7161 | 473 | long ret, |
5b7ac358 MD |
474 | unsigned long arg0, |
475 | unsigned long arg1, | |
476 | unsigned long arg2, | |
477 | unsigned long arg3, | |
478 | unsigned long arg4, | |
3b82c4e1 | 479 | unsigned long arg5) = func; |
1b7b9c65 | 480 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 481 | |
1b7b9c65 | 482 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
483 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
484 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 485 | args[3], args[4], args[5]); |
5b7ac358 MD |
486 | break; |
487 | } | |
488 | default: | |
489 | break; | |
490 | } | |
491 | } | |
492 | ||
3b82c4e1 MD |
493 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
494 | { | |
495 | struct lttng_channel *chan = __data; | |
496 | struct hlist_head *action_list, *unknown_action_list; | |
497 | const struct trace_syscall_entry *table, *entry; | |
498 | size_t table_len; | |
499 | long id; | |
500 | ||
501 | id = syscall_get_nr(current, regs); | |
502 | ||
503 | if (unlikely(in_compat_syscall())) { | |
504 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
505 | ||
506 | if (id < 0 || id >= NR_compat_syscalls | |
507 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { | |
508 | /* System call filtered out. */ | |
509 | return; | |
510 | } | |
f385fc5f FD |
511 | table = compat_sc_exit_table.table; |
512 | table_len = compat_sc_exit_table.len; | |
3b82c4e1 MD |
513 | unknown_action_list = &chan->compat_sc_exit_unknown; |
514 | } else { | |
515 | struct lttng_syscall_filter *filter = chan->sc_filter; | |
516 | ||
517 | if (id < 0 || id >= NR_syscalls | |
518 | || (!READ_ONCE(chan->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { | |
519 | /* System call filtered out. */ | |
520 | return; | |
521 | } | |
f385fc5f FD |
522 | table = sc_exit_table.table; |
523 | table_len = sc_exit_table.len; | |
3b82c4e1 MD |
524 | unknown_action_list = &chan->sc_exit_unknown; |
525 | } | |
526 | if (unlikely(id < 0 || id >= table_len)) { | |
527 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
528 | return; | |
529 | } | |
530 | ||
531 | entry = &table[id]; | |
532 | if (!entry->event_func) { | |
533 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
534 | return; | |
535 | } | |
536 | ||
537 | if (unlikely(in_compat_syscall())) { | |
538 | action_list = &chan->compat_sc_exit_table[id]; | |
539 | } else { | |
540 | action_list = &chan->sc_exit_table[id]; | |
541 | } | |
542 | if (unlikely(hlist_empty(action_list))) | |
543 | return; | |
544 | ||
e2d5dbc7 | 545 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
546 | regs, ret); |
547 | } | |
548 | ||
8a8ac9a8 FD |
549 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, |
550 | long ret) | |
551 | { | |
552 | struct lttng_event_notifier_group *group = __data; | |
553 | const struct trace_syscall_entry *table, *entry; | |
554 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
555 | size_t table_len; | |
556 | long id; | |
557 | ||
558 | id = syscall_get_nr(current, regs); | |
559 | ||
560 | if (unlikely(in_compat_syscall())) { | |
561 | struct lttng_syscall_filter *filter = group->sc_filter; | |
562 | ||
563 | if (id < 0 || id >= NR_compat_syscalls | |
564 | || (!READ_ONCE(group->syscall_all_exit) && | |
565 | !test_bit(id, filter->sc_compat_exit))) { | |
566 | /* System call filtered out. */ | |
567 | return; | |
568 | } | |
f385fc5f FD |
569 | table = compat_sc_exit_table.table; |
570 | table_len = compat_sc_exit_table.len; | |
8a8ac9a8 FD |
571 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; |
572 | } else { | |
573 | struct lttng_syscall_filter *filter = group->sc_filter; | |
574 | ||
575 | if (id < 0 || id >= NR_syscalls | |
576 | || (!READ_ONCE(group->syscall_all_exit) && | |
577 | !test_bit(id, filter->sc_exit))) { | |
578 | /* System call filtered out. */ | |
579 | return; | |
580 | } | |
f385fc5f FD |
581 | table = sc_exit_table.table; |
582 | table_len = sc_exit_table.len; | |
8a8ac9a8 FD |
583 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; |
584 | } | |
585 | /* Check if the syscall id is out of bound. */ | |
586 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 587 | syscall_exit_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
588 | regs, id, ret); |
589 | return; | |
590 | } | |
591 | ||
592 | entry = &table[id]; | |
e2d5dbc7 MD |
593 | if (!entry->event_func) { |
594 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
595 | regs, id); |
596 | return; | |
597 | } | |
598 | ||
599 | if (unlikely(in_compat_syscall())) { | |
600 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
601 | } else { | |
602 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
603 | } | |
604 | if (unlikely(hlist_empty(dispatch_list))) | |
605 | return; | |
606 | ||
e2d5dbc7 MD |
607 | syscall_exit_event_call_func(dispatch_list, |
608 | entry->event_func, entry->nrargs, regs, ret); | |
8a8ac9a8 | 609 | } |
33a39a3c MD |
610 | /* |
611 | * noinline to diminish caller stack size. | |
612 | * Should be called with sessions lock held. | |
613 | */ | |
49c50022 | 614 | static |
3b82c4e1 MD |
615 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
616 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
a67ba386 | 617 | enum sc_type type) |
259b6cb3 | 618 | { |
3b82c4e1 | 619 | struct lttng_channel *chan = event_enabler->chan; |
a40e3229 | 620 | struct lttng_kernel_session *session = chan->session; |
259b6cb3 | 621 | unsigned int i; |
49c50022 | 622 | |
3b82c4e1 | 623 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 624 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 625 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
606828e4 | 626 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
627 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
628 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
629 | struct hlist_head *head; |
630 | bool found = false; | |
49c50022 MD |
631 | |
632 | if (!desc) { | |
633 | /* Unknown syscall */ | |
634 | continue; | |
635 | } | |
3b82c4e1 MD |
636 | if (lttng_desc_match_enabler(desc, |
637 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
638 | continue; | |
49c50022 | 639 | /* |
3b82c4e1 | 640 | * Check if already created. |
49c50022 | 641 | */ |
3b82c4e1 | 642 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 643 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 644 | desc->event_name); |
a67ba386 MD |
645 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
646 | if (event_recorder_priv->parent.desc == desc | |
647 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3b82c4e1 MD |
648 | found = true; |
649 | } | |
650 | if (found) | |
49c50022 | 651 | continue; |
3b82c4e1 MD |
652 | |
653 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 654 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
655 | switch (type) { |
656 | case SC_TYPE_ENTRY: | |
606828e4 MD |
657 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
658 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
659 | break; |
660 | case SC_TYPE_EXIT: | |
606828e4 MD |
661 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
662 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
663 | break; |
664 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
665 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
666 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
667 | break; |
668 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
669 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
670 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
671 | break; |
672 | } | |
606828e4 MD |
673 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
674 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
675 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
a67ba386 MD |
676 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, ev.instrumentation); |
677 | WARN_ON_ONCE(!event_recorder); | |
678 | if (IS_ERR(event_recorder)) { | |
49c50022 MD |
679 | /* |
680 | * If something goes wrong in event registration | |
681 | * after the first one, we have no choice but to | |
682 | * leave the previous events in there, until | |
683 | * deleted by session teardown. | |
684 | */ | |
a67ba386 | 685 | return PTR_ERR(event_recorder); |
49c50022 | 686 | } |
a67ba386 | 687 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
688 | } |
689 | return 0; | |
690 | } | |
691 | ||
33a39a3c MD |
692 | /* |
693 | * Should be called with sessions lock held. | |
694 | */ | |
a67ba386 | 695 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler) |
49c50022 | 696 | { |
3b82c4e1 | 697 | struct lttng_channel *chan = event_enabler->chan; |
606828e4 | 698 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
699 | int ret; |
700 | ||
263b6c88 | 701 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 MD |
702 | |
703 | if (!chan->sc_table) { | |
704 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 705 | chan->sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 706 | * sc_table.len, GFP_KERNEL); |
259b6cb3 MD |
707 | if (!chan->sc_table) |
708 | return -ENOMEM; | |
709 | } | |
5b7ac358 MD |
710 | if (!chan->sc_exit_table) { |
711 | /* create syscall table mapping syscall to events */ | |
a67ba386 | 712 | chan->sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 713 | * sc_exit_table.len, GFP_KERNEL); |
5b7ac358 MD |
714 | if (!chan->sc_exit_table) |
715 | return -ENOMEM; | |
716 | } | |
717 | ||
259b6cb3 | 718 | |
49c50022 MD |
719 | #ifdef CONFIG_COMPAT |
720 | if (!chan->compat_sc_table) { | |
721 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 722 | chan->compat_sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 723 | * compat_sc_table.len, GFP_KERNEL); |
49c50022 MD |
724 | if (!chan->compat_sc_table) |
725 | return -ENOMEM; | |
726 | } | |
5b7ac358 MD |
727 | |
728 | if (!chan->compat_sc_exit_table) { | |
729 | /* create syscall table mapping compat syscall to events */ | |
a67ba386 | 730 | chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 731 | * compat_sc_exit_table.len, GFP_KERNEL); |
5b7ac358 MD |
732 | if (!chan->compat_sc_exit_table) |
733 | return -ENOMEM; | |
734 | } | |
49c50022 | 735 | #endif |
3b82c4e1 | 736 | if (hlist_empty(&chan->sc_unknown)) { |
437d5aa5 | 737 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 738 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 739 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a | 740 | |
f405cfce | 741 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
742 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
743 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
744 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
745 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
746 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 747 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 748 | ev.instrumentation); |
a67ba386 MD |
749 | WARN_ON_ONCE(!event_recorder); |
750 | if (IS_ERR(event_recorder)) { | |
751 | return PTR_ERR(event_recorder); | |
f405cfce | 752 | } |
a67ba386 | 753 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_unknown); |
f405cfce MD |
754 | } |
755 | ||
3b82c4e1 | 756 | if (hlist_empty(&chan->sc_compat_unknown)) { |
437d5aa5 | 757 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 758 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 759 | struct lttng_kernel_event_recorder *event_recorder; |
b76dc1a0 MD |
760 | |
761 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
762 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
763 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
764 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
765 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
766 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 767 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 768 | ev.instrumentation); |
a67ba386 MD |
769 | WARN_ON_ONCE(!event_recorder); |
770 | if (IS_ERR(event_recorder)) { | |
771 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 772 | } |
a67ba386 | 773 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_compat_unknown); |
b76dc1a0 MD |
774 | } |
775 | ||
3b82c4e1 | 776 | if (hlist_empty(&chan->compat_sc_exit_unknown)) { |
437d5aa5 | 777 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 778 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 779 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a MD |
780 | |
781 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
782 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
783 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
784 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
785 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
786 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 787 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 788 | ev.instrumentation); |
a67ba386 MD |
789 | WARN_ON_ONCE(!event_recorder); |
790 | if (IS_ERR(event_recorder)) { | |
791 | return PTR_ERR(event_recorder); | |
5b7ac358 | 792 | } |
a67ba386 | 793 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->compat_sc_exit_unknown); |
5b7ac358 MD |
794 | } |
795 | ||
3b82c4e1 | 796 | if (hlist_empty(&chan->sc_exit_unknown)) { |
437d5aa5 | 797 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 798 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 799 | struct lttng_kernel_event_recorder *event_recorder; |
5b7ac358 MD |
800 | |
801 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
802 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
803 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
804 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
805 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
806 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 807 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 808 | ev.instrumentation); |
a67ba386 MD |
809 | WARN_ON_ONCE(!event_recorder); |
810 | if (IS_ERR(event_recorder)) { | |
811 | return PTR_ERR(event_recorder); | |
2f804c0a | 812 | } |
a67ba386 | 813 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->sc_exit_unknown); |
2f804c0a MD |
814 | } |
815 | ||
f385fc5f | 816 | ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, |
a67ba386 | 817 | chan->sc_table, event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
818 | if (ret) |
819 | return ret; | |
f385fc5f | 820 | ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, |
a67ba386 | 821 | chan->sc_exit_table, event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
822 | if (ret) |
823 | return ret; | |
5b7ac358 | 824 | |
49c50022 | 825 | #ifdef CONFIG_COMPAT |
f385fc5f | 826 | ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, |
a67ba386 | 827 | chan->compat_sc_table, event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
828 | if (ret) |
829 | return ret; | |
f385fc5f | 830 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, |
a67ba386 | 831 | chan->compat_sc_exit_table, event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
832 | if (ret) |
833 | return ret; | |
834 | #endif | |
badfe9f5 MD |
835 | |
836 | if (!chan->sc_filter) { | |
837 | chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
838 | GFP_KERNEL); | |
839 | if (!chan->sc_filter) | |
840 | return -ENOMEM; | |
841 | } | |
842 | ||
80f87dd2 MD |
843 | if (!chan->sys_enter_registered) { |
844 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
2d6d88c6 | 845 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
846 | if (ret) |
847 | return ret; | |
848 | chan->sys_enter_registered = 1; | |
849 | } | |
63728b02 MD |
850 | /* |
851 | * We change the name of sys_exit tracepoint due to namespace | |
852 | * conflict with sys_exit syscall entry. | |
853 | */ | |
80f87dd2 MD |
854 | if (!chan->sys_exit_registered) { |
855 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
2d6d88c6 | 856 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
857 | if (ret) { |
858 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 859 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
860 | return ret; |
861 | } | |
862 | chan->sys_exit_registered = 1; | |
63728b02 | 863 | } |
259b6cb3 MD |
864 | return ret; |
865 | } | |
866 | ||
867 | /* | |
8a8ac9a8 FD |
868 | * Should be called with sessions lock held. |
869 | */ | |
870 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 871 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
872 | { |
873 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
874 | unsigned int i; | |
875 | int ret = 0; | |
876 | ||
877 | wrapper_vmalloc_sync_mappings(); | |
878 | ||
879 | if (!group->event_notifier_syscall_dispatch) { | |
880 | group->event_notifier_syscall_dispatch = | |
f385fc5f | 881 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
882 | GFP_KERNEL); |
883 | if (!group->event_notifier_syscall_dispatch) | |
884 | return -ENOMEM; | |
885 | ||
886 | /* Initialize all list_head */ | |
f385fc5f | 887 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
888 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); |
889 | ||
890 | /* Init the unknown syscall notifier list. */ | |
891 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
892 | } | |
893 | ||
894 | if (!group->event_notifier_exit_syscall_dispatch) { | |
895 | group->event_notifier_exit_syscall_dispatch = | |
f385fc5f | 896 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
897 | GFP_KERNEL); |
898 | if (!group->event_notifier_exit_syscall_dispatch) | |
899 | return -ENOMEM; | |
900 | ||
901 | /* Initialize all list_head */ | |
f385fc5f | 902 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
903 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); |
904 | ||
905 | /* Init the unknown exit syscall notifier list. */ | |
906 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
907 | } | |
908 | ||
909 | #ifdef CONFIG_COMPAT | |
910 | if (!group->event_notifier_compat_syscall_dispatch) { | |
911 | group->event_notifier_compat_syscall_dispatch = | |
f385fc5f | 912 | kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, |
8a8ac9a8 FD |
913 | GFP_KERNEL); |
914 | if (!group->event_notifier_syscall_dispatch) | |
915 | return -ENOMEM; | |
916 | ||
917 | /* Initialize all list_head */ | |
f385fc5f | 918 | for (i = 0; i < compat_sc_table.len; i++) |
8a8ac9a8 FD |
919 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); |
920 | ||
921 | /* Init the unknown syscall notifier list. */ | |
922 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
923 | } | |
924 | ||
925 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
926 | group->event_notifier_exit_compat_syscall_dispatch = | |
f385fc5f | 927 | kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, |
8a8ac9a8 FD |
928 | GFP_KERNEL); |
929 | if (!group->event_notifier_exit_syscall_dispatch) | |
930 | return -ENOMEM; | |
931 | ||
932 | /* Initialize all list_head */ | |
f385fc5f | 933 | for (i = 0; i < compat_sc_exit_table.len; i++) |
8a8ac9a8 FD |
934 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); |
935 | ||
936 | /* Init the unknown exit syscall notifier list. */ | |
937 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
938 | } | |
939 | #endif | |
940 | ||
941 | if (!group->sc_filter) { | |
942 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
943 | GFP_KERNEL); | |
944 | if (!group->sc_filter) | |
945 | return -ENOMEM; | |
946 | } | |
947 | ||
948 | if (!group->sys_enter_registered) { | |
949 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
950 | (void *) syscall_entry_event_notifier_probe, group); | |
951 | if (ret) | |
952 | return ret; | |
953 | group->sys_enter_registered = 1; | |
954 | } | |
955 | ||
956 | if (!group->sys_exit_registered) { | |
957 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
958 | (void *) syscall_exit_event_notifier_probe, group); | |
959 | if (ret) { | |
960 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
961 | (void *) syscall_entry_event_notifier_probe, group)); | |
962 | return ret; | |
963 | } | |
964 | group->sys_exit_registered = 1; | |
965 | } | |
966 | ||
967 | return ret; | |
968 | } | |
969 | ||
970 | static | |
971 | int create_unknown_event_notifier( | |
972 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
973 | enum sc_type type) | |
974 | { | |
a67ba386 MD |
975 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
976 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 977 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 978 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
606828e4 | 979 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 | 980 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 981 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
982 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
983 | event_notifier_enabler); | |
984 | struct hlist_head *unknown_dispatch_list; | |
985 | int ret = 0; | |
986 | bool found = false; | |
606828e4 MD |
987 | enum lttng_kernel_abi_syscall_abi abi; |
988 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
989 | struct hlist_head *head; |
990 | ||
991 | switch (type) { | |
992 | case SC_TYPE_ENTRY: | |
993 | desc = &__event_desc___syscall_entry_unknown; | |
994 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
606828e4 MD |
995 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
996 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
997 | break; |
998 | case SC_TYPE_EXIT: | |
999 | desc = &__event_desc___syscall_exit_unknown; | |
1000 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
606828e4 MD |
1001 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1002 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1003 | break; |
1004 | case SC_TYPE_COMPAT_ENTRY: | |
1005 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1006 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1007 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1008 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1009 | break; |
1010 | case SC_TYPE_COMPAT_EXIT: | |
1011 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1012 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1013 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1014 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1015 | break; |
1016 | default: | |
1017 | BUG_ON(1); | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * Check if already created. | |
1022 | */ | |
1023 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1024 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1025 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1026 | if (event_notifier_priv->parent.desc == desc && | |
1027 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
1028 | found = true; |
1029 | } | |
1030 | if (found) | |
1031 | goto end; | |
1032 | ||
1033 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 1034 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 1035 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 1036 | |
606828e4 | 1037 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 1038 | |
606828e4 | 1039 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
1040 | event_notifier_param.event.u.syscall.abi = abi; |
1041 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1042 | ||
a67ba386 MD |
1043 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1044 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 1045 | event_notifier_param.event.instrumentation); |
a67ba386 | 1046 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 1047 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 1048 | desc->event_name); |
8a8ac9a8 FD |
1049 | ret = -ENOMEM; |
1050 | goto end; | |
1051 | } | |
1052 | ||
a67ba386 | 1053 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
1054 | |
1055 | end: | |
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | static int create_matching_event_notifiers( | |
1060 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 1061 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
1062 | size_t table_len, enum sc_type type) |
1063 | { | |
1064 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 1065 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1066 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1067 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1068 | unsigned int i; |
1069 | int ret = 0; | |
1070 | ||
1071 | /* iterate over all syscall and create event_notifier that match */ | |
1072 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
1073 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1074 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 1075 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
1076 | struct hlist_head *head; |
1077 | int found = 0; | |
1078 | ||
1079 | desc = table[i].desc; | |
1080 | if (!desc) { | |
1081 | /* Unknown syscall */ | |
1082 | continue; | |
1083 | } | |
1084 | ||
1085 | if (!lttng_desc_match_enabler(desc, | |
1086 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1087 | continue; | |
1088 | ||
1089 | /* | |
1090 | * Check if already created. | |
1091 | */ | |
1092 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1093 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1094 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1095 | if (event_notifier_priv->parent.desc == desc | |
1096 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
8a8ac9a8 FD |
1097 | found = 1; |
1098 | } | |
1099 | if (found) | |
1100 | continue; | |
1101 | ||
1102 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1103 | switch (type) { | |
1104 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1105 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1106 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1107 | break; |
1108 | case SC_TYPE_EXIT: | |
606828e4 MD |
1109 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1110 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1111 | break; |
1112 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1113 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1114 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1115 | break; |
1116 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1117 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1118 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1119 | break; |
1120 | } | |
437d5aa5 | 1121 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1122 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1123 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1124 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1125 | |
99f52fcc FD |
1126 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1127 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1128 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1129 | if (IS_ERR(event_notifier)) { |
1130 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1131 | desc->event_name); |
8a8ac9a8 FD |
1132 | ret = -ENOMEM; |
1133 | goto end; | |
1134 | } | |
1135 | ||
a67ba386 | 1136 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1137 | } |
1138 | ||
1139 | end: | |
1140 | return ret; | |
1141 | ||
1142 | } | |
1143 | ||
a67ba386 MD |
1144 | int lttng_syscalls_create_matching_event_notifiers( |
1145 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1146 | { |
1147 | int ret; | |
1148 | struct lttng_enabler *base_enabler = | |
1149 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
606828e4 | 1150 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1151 | base_enabler->event_param.u.syscall.entryexit; |
1152 | ||
606828e4 | 1153 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1154 | ret = create_matching_event_notifiers(event_notifier_enabler, |
f385fc5f | 1155 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1156 | if (ret) |
1157 | goto end; | |
1158 | ||
1159 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
f385fc5f | 1160 | compat_sc_table.table, compat_sc_table.len, |
8a8ac9a8 FD |
1161 | SC_TYPE_COMPAT_ENTRY); |
1162 | if (ret) | |
1163 | goto end; | |
1164 | ||
1165 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1166 | SC_TYPE_ENTRY); | |
1167 | if (ret) | |
1168 | goto end; | |
1169 | ||
1170 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1171 | SC_TYPE_COMPAT_ENTRY); | |
1172 | if (ret) | |
1173 | goto end; | |
1174 | } | |
1175 | ||
606828e4 | 1176 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1177 | ret = create_matching_event_notifiers(event_notifier_enabler, |
f385fc5f | 1178 | sc_exit_table.table, sc_exit_table.len, |
8a8ac9a8 FD |
1179 | SC_TYPE_EXIT); |
1180 | if (ret) | |
1181 | goto end; | |
1182 | ||
1183 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1184 | SC_TYPE_EXIT); | |
1185 | if (ret) | |
1186 | goto end; | |
1187 | ||
1188 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
f385fc5f | 1189 | compat_sc_exit_table.table, compat_sc_exit_table.len, |
8a8ac9a8 FD |
1190 | SC_TYPE_COMPAT_EXIT); |
1191 | if (ret) | |
1192 | goto end; | |
1193 | ||
1194 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1195 | SC_TYPE_COMPAT_EXIT); | |
1196 | if (ret) | |
1197 | goto end; | |
1198 | } | |
1199 | ||
1200 | end: | |
1201 | return ret; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1206 | */ |
3b82c4e1 | 1207 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1208 | struct lttng_event_notifier_group *event_notifier_group) |
1209 | { | |
1210 | int ret; | |
1211 | ||
1212 | /* | |
1213 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1214 | * At the moment, we don't think it's desirable to have one fired | |
1215 | * event_notifier for the entry and one for the exit of a syscall. | |
1216 | */ | |
1217 | if (event_notifier_group->sys_enter_registered) { | |
1218 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1219 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1220 | if (ret) | |
1221 | return ret; | |
1222 | event_notifier_group->sys_enter_registered = 0; | |
1223 | } | |
1224 | if (event_notifier_group->sys_exit_registered) { | |
1225 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1226 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1227 | if (ret) | |
1228 | return ret; | |
1229 | event_notifier_group->sys_enter_registered = 0; | |
1230 | } | |
1231 | ||
1232 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1233 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1234 | #ifdef CONFIG_COMPAT | |
1235 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1236 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1237 | #endif | |
1238 | return 0; | |
1239 | } | |
1240 | ||
3b82c4e1 | 1241 | int lttng_syscalls_unregister_channel(struct lttng_channel *chan) |
259b6cb3 MD |
1242 | { |
1243 | int ret; | |
1244 | ||
1245 | if (!chan->sc_table) | |
1246 | return 0; | |
80f87dd2 | 1247 | if (chan->sys_enter_registered) { |
2d9cd7f3 | 1248 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1249 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1250 | if (ret) |
1251 | return ret; | |
1252 | chan->sys_enter_registered = 0; | |
1253 | } | |
1254 | if (chan->sys_exit_registered) { | |
2d9cd7f3 | 1255 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1256 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1257 | if (ret) |
1258 | return ret; | |
1259 | chan->sys_exit_registered = 0; | |
1260 | } | |
badfe9f5 MD |
1261 | return 0; |
1262 | } | |
1263 | ||
2d6d88c6 | 1264 | int lttng_syscalls_destroy_event(struct lttng_channel *chan) |
badfe9f5 | 1265 | { |
259b6cb3 | 1266 | kfree(chan->sc_table); |
5b7ac358 | 1267 | kfree(chan->sc_exit_table); |
49c50022 MD |
1268 | #ifdef CONFIG_COMPAT |
1269 | kfree(chan->compat_sc_table); | |
5b7ac358 | 1270 | kfree(chan->compat_sc_exit_table); |
49c50022 | 1271 | #endif |
80f87dd2 MD |
1272 | kfree(chan->sc_filter); |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | static | |
1277 | int get_syscall_nr(const char *syscall_name) | |
1278 | { | |
1279 | int syscall_nr = -1; | |
1280 | int i; | |
1281 | ||
f385fc5f | 1282 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 1283 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1284 | const char *it_name; |
80f87dd2 | 1285 | |
f385fc5f | 1286 | entry = &sc_table.table[i]; |
80f87dd2 MD |
1287 | if (!entry->desc) |
1288 | continue; | |
437d5aa5 | 1289 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1290 | it_name += strlen(SYSCALL_ENTRY_STR); |
1291 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1292 | syscall_nr = i; |
1293 | break; | |
1294 | } | |
1295 | } | |
1296 | return syscall_nr; | |
1297 | } | |
1298 | ||
1299 | static | |
1300 | int get_compat_syscall_nr(const char *syscall_name) | |
1301 | { | |
1302 | int syscall_nr = -1; | |
1303 | int i; | |
1304 | ||
f385fc5f | 1305 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 1306 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1307 | const char *it_name; |
80f87dd2 | 1308 | |
f385fc5f | 1309 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
1310 | if (!entry->desc) |
1311 | continue; | |
437d5aa5 | 1312 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1313 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1314 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1315 | syscall_nr = i; |
1316 | break; | |
1317 | } | |
1318 | } | |
1319 | return syscall_nr; | |
1320 | } | |
1321 | ||
12e579db MD |
1322 | static |
1323 | uint32_t get_sc_tables_len(void) | |
1324 | { | |
f385fc5f | 1325 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
1326 | } |
1327 | ||
badfe9f5 | 1328 | static |
ade8a729 FD |
1329 | const char *get_syscall_name(const char *desc_name, |
1330 | enum lttng_syscall_abi abi, | |
1331 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1332 | { |
badfe9f5 | 1333 | size_t prefix_len = 0; |
80f87dd2 | 1334 | |
80f87dd2 | 1335 | |
ade8a729 | 1336 | switch (entryexit) { |
badfe9f5 | 1337 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1338 | switch (abi) { |
badfe9f5 MD |
1339 | case LTTNG_SYSCALL_ABI_NATIVE: |
1340 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1341 | break; | |
1342 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1343 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1344 | break; | |
80f87dd2 | 1345 | } |
badfe9f5 MD |
1346 | break; |
1347 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1348 | switch (abi) { |
badfe9f5 MD |
1349 | case LTTNG_SYSCALL_ABI_NATIVE: |
1350 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1351 | break; | |
1352 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1353 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1354 | break; | |
80f87dd2 | 1355 | } |
badfe9f5 | 1356 | break; |
80f87dd2 | 1357 | } |
badfe9f5 | 1358 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1359 | return desc_name + prefix_len; |
badfe9f5 MD |
1360 | } |
1361 | ||
ade8a729 FD |
1362 | static |
1363 | int lttng_syscall_filter_enable( | |
1364 | struct lttng_syscall_filter *filter, | |
1365 | const char *desc_name, enum lttng_syscall_abi abi, | |
1366 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1367 | { |
badfe9f5 MD |
1368 | const char *syscall_name; |
1369 | unsigned long *bitmap; | |
1370 | int syscall_nr; | |
1371 | ||
ade8a729 | 1372 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1373 | |
ade8a729 | 1374 | switch (abi) { |
badfe9f5 MD |
1375 | case LTTNG_SYSCALL_ABI_NATIVE: |
1376 | syscall_nr = get_syscall_nr(syscall_name); | |
1377 | break; | |
1378 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1379 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1380 | break; | |
1381 | default: | |
1382 | return -EINVAL; | |
80f87dd2 | 1383 | } |
badfe9f5 MD |
1384 | if (syscall_nr < 0) |
1385 | return -ENOENT; | |
1386 | ||
ade8a729 | 1387 | switch (entryexit) { |
badfe9f5 | 1388 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1389 | switch (abi) { |
badfe9f5 MD |
1390 | case LTTNG_SYSCALL_ABI_NATIVE: |
1391 | bitmap = filter->sc_entry; | |
1392 | break; | |
1393 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1394 | bitmap = filter->sc_compat_entry; | |
1395 | break; | |
6d9694d8 MD |
1396 | default: |
1397 | return -EINVAL; | |
80f87dd2 | 1398 | } |
badfe9f5 MD |
1399 | break; |
1400 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1401 | switch (abi) { |
badfe9f5 MD |
1402 | case LTTNG_SYSCALL_ABI_NATIVE: |
1403 | bitmap = filter->sc_exit; | |
1404 | break; | |
1405 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1406 | bitmap = filter->sc_compat_exit; | |
1407 | break; | |
6d9694d8 MD |
1408 | default: |
1409 | return -EINVAL; | |
80f87dd2 | 1410 | } |
badfe9f5 MD |
1411 | break; |
1412 | default: | |
1413 | return -EINVAL; | |
80f87dd2 | 1414 | } |
badfe9f5 MD |
1415 | if (test_bit(syscall_nr, bitmap)) |
1416 | return -EEXIST; | |
1417 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1418 | return 0; |
80f87dd2 MD |
1419 | } |
1420 | ||
8a8ac9a8 | 1421 | int lttng_syscall_filter_enable_event_notifier( |
a67ba386 | 1422 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1423 | { |
a67ba386 MD |
1424 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
1425 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; | |
8a8ac9a8 FD |
1426 | struct hlist_head *dispatch_list; |
1427 | int ret = 0; | |
1428 | ||
a67ba386 | 1429 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
1430 | |
1431 | ret = lttng_syscall_filter_enable(group->sc_filter, | |
a67ba386 MD |
1432 | event_notifier->priv->parent.desc->event_name, |
1433 | event_notifier->priv->parent.u.syscall.abi, | |
1434 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1435 | if (ret) { |
1436 | goto end; | |
1437 | } | |
1438 | ||
a67ba386 | 1439 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 1440 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 1441 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1442 | case LTTNG_SYSCALL_ABI_NATIVE: |
1443 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1444 | break; | |
1445 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1446 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1447 | break; | |
6866b1c7 MJ |
1448 | default: |
1449 | ret = -EINVAL; | |
1450 | goto end; | |
8a8ac9a8 FD |
1451 | } |
1452 | break; | |
1453 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 1454 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1455 | case LTTNG_SYSCALL_ABI_NATIVE: |
1456 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1457 | break; | |
1458 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1459 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1460 | break; | |
6866b1c7 MJ |
1461 | default: |
1462 | ret = -EINVAL; | |
1463 | goto end; | |
8a8ac9a8 FD |
1464 | } |
1465 | break; | |
6866b1c7 MJ |
1466 | default: |
1467 | ret = -EINVAL; | |
1468 | goto end; | |
8a8ac9a8 FD |
1469 | } |
1470 | ||
a67ba386 | 1471 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
1472 | |
1473 | end: | |
1474 | return ret ; | |
1475 | } | |
1476 | ||
ade8a729 FD |
1477 | int lttng_syscall_filter_enable_event( |
1478 | struct lttng_channel *channel, | |
a67ba386 | 1479 | struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 1480 | { |
a67ba386 | 1481 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 FD |
1482 | |
1483 | return lttng_syscall_filter_enable(channel->sc_filter, | |
a67ba386 MD |
1484 | event_recorder->priv->parent.desc->event_name, |
1485 | event_recorder->priv->parent.u.syscall.abi, | |
1486 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1487 | } |
1488 | ||
1489 | static | |
1490 | int lttng_syscall_filter_disable( | |
1491 | struct lttng_syscall_filter *filter, | |
1492 | const char *desc_name, enum lttng_syscall_abi abi, | |
1493 | enum lttng_syscall_entryexit entryexit) | |
1494 | { | |
badfe9f5 MD |
1495 | const char *syscall_name; |
1496 | unsigned long *bitmap; | |
1497 | int syscall_nr; | |
80f87dd2 | 1498 | |
ade8a729 | 1499 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1500 | |
ade8a729 | 1501 | switch (abi) { |
badfe9f5 MD |
1502 | case LTTNG_SYSCALL_ABI_NATIVE: |
1503 | syscall_nr = get_syscall_nr(syscall_name); | |
1504 | break; | |
1505 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1506 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1507 | break; | |
1508 | default: | |
1509 | return -EINVAL; | |
80f87dd2 | 1510 | } |
badfe9f5 MD |
1511 | if (syscall_nr < 0) |
1512 | return -ENOENT; | |
80f87dd2 | 1513 | |
ade8a729 | 1514 | switch (entryexit) { |
badfe9f5 | 1515 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1516 | switch (abi) { |
badfe9f5 MD |
1517 | case LTTNG_SYSCALL_ABI_NATIVE: |
1518 | bitmap = filter->sc_entry; | |
1519 | break; | |
1520 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1521 | bitmap = filter->sc_compat_entry; | |
1522 | break; | |
6d9694d8 MD |
1523 | default: |
1524 | return -EINVAL; | |
80f87dd2 | 1525 | } |
badfe9f5 MD |
1526 | break; |
1527 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1528 | switch (abi) { |
badfe9f5 MD |
1529 | case LTTNG_SYSCALL_ABI_NATIVE: |
1530 | bitmap = filter->sc_exit; | |
1531 | break; | |
1532 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1533 | bitmap = filter->sc_compat_exit; | |
1534 | break; | |
6d9694d8 MD |
1535 | default: |
1536 | return -EINVAL; | |
80f87dd2 | 1537 | } |
badfe9f5 MD |
1538 | break; |
1539 | default: | |
1540 | return -EINVAL; | |
80f87dd2 | 1541 | } |
badfe9f5 MD |
1542 | if (!test_bit(syscall_nr, bitmap)) |
1543 | return -EEXIST; | |
1544 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1545 | |
badfe9f5 | 1546 | return 0; |
259b6cb3 | 1547 | } |
2d2464bd | 1548 | |
8a8ac9a8 | 1549 | int lttng_syscall_filter_disable_event_notifier( |
a67ba386 | 1550 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1551 | { |
a67ba386 | 1552 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
8a8ac9a8 FD |
1553 | int ret; |
1554 | ||
a67ba386 | 1555 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 FD |
1556 | |
1557 | ret = lttng_syscall_filter_disable(group->sc_filter, | |
a67ba386 MD |
1558 | event_notifier->priv->parent.desc->event_name, |
1559 | event_notifier->priv->parent.u.syscall.abi, | |
1560 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1561 | WARN_ON_ONCE(ret != 0); |
1562 | ||
a67ba386 | 1563 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
1564 | return 0; |
1565 | } | |
1566 | ||
ade8a729 FD |
1567 | int lttng_syscall_filter_disable_event( |
1568 | struct lttng_channel *channel, | |
a67ba386 | 1569 | struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 FD |
1570 | { |
1571 | return lttng_syscall_filter_disable(channel->sc_filter, | |
a67ba386 MD |
1572 | event_recorder->priv->parent.desc->event_name, |
1573 | event_recorder->priv->parent.u.syscall.abi, | |
1574 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1575 | } |
1576 | ||
2d2464bd MD |
1577 | static |
1578 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1579 | { | |
1580 | const struct trace_syscall_entry *entry; | |
1581 | int iter = 0; | |
1582 | ||
f385fc5f FD |
1583 | for (entry = sc_table.table; |
1584 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1585 | entry++) { |
1586 | if (iter++ >= *pos) | |
1587 | return entry; | |
1588 | } | |
f385fc5f FD |
1589 | for (entry = compat_sc_table.table; |
1590 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1591 | entry++) { |
1592 | if (iter++ >= *pos) | |
1593 | return entry; | |
1594 | } | |
1595 | /* End of list */ | |
1596 | return NULL; | |
1597 | } | |
1598 | ||
1599 | static | |
1600 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1601 | { | |
1602 | return (void *) syscall_list_get_entry(pos); | |
1603 | } | |
1604 | ||
1605 | static | |
1606 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1607 | { | |
1608 | (*ppos)++; | |
1609 | return (void *) syscall_list_get_entry(ppos); | |
1610 | } | |
1611 | ||
1612 | static | |
1613 | void syscall_list_stop(struct seq_file *m, void *p) | |
1614 | { | |
1615 | } | |
1616 | ||
12e579db MD |
1617 | static |
1618 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1619 | const struct trace_syscall_entry **table, | |
1620 | unsigned int *bitness) | |
1621 | { | |
f385fc5f | 1622 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1623 | if (bitness) |
1624 | *bitness = BITS_PER_LONG; | |
1625 | if (table) | |
f385fc5f | 1626 | *table = sc_table.table; |
12e579db MD |
1627 | return 0; |
1628 | } | |
f385fc5f FD |
1629 | if (!(entry >= compat_sc_table.table |
1630 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1631 | return -EINVAL; |
1632 | } | |
1633 | if (bitness) | |
1634 | *bitness = 32; | |
1635 | if (table) | |
f385fc5f | 1636 | *table = compat_sc_table.table; |
12e579db MD |
1637 | return 0; |
1638 | } | |
1639 | ||
2d2464bd MD |
1640 | static |
1641 | int syscall_list_show(struct seq_file *m, void *p) | |
1642 | { | |
1643 | const struct trace_syscall_entry *table, *entry = p; | |
1644 | unsigned int bitness; | |
d4291869 | 1645 | unsigned long index; |
12e579db | 1646 | int ret; |
d4291869 | 1647 | const char *name; |
2d2464bd | 1648 | |
12e579db MD |
1649 | ret = get_sc_table(entry, &table, &bitness); |
1650 | if (ret) | |
1651 | return ret; | |
f4855b46 MD |
1652 | if (!entry->desc) |
1653 | return 0; | |
f385fc5f | 1654 | if (table == sc_table.table) { |
d4291869 | 1655 | index = entry - table; |
437d5aa5 | 1656 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1657 | } else { |
f385fc5f | 1658 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1659 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1660 | } |
12e579db | 1661 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1662 | index, name, bitness); |
2d2464bd MD |
1663 | return 0; |
1664 | } | |
1665 | ||
1666 | static | |
1667 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1668 | .start = syscall_list_start, | |
1669 | .next = syscall_list_next, | |
1670 | .stop = syscall_list_stop, | |
1671 | .show = syscall_list_show, | |
1672 | }; | |
1673 | ||
1674 | static | |
1675 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1676 | { | |
1677 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1678 | } | |
1679 | ||
1680 | const struct file_operations lttng_syscall_list_fops = { | |
1681 | .owner = THIS_MODULE, | |
1682 | .open = lttng_syscall_list_open, | |
1683 | .read = seq_read, | |
1684 | .llseek = seq_lseek, | |
1685 | .release = seq_release, | |
1686 | }; | |
12e579db | 1687 | |
badfe9f5 MD |
1688 | /* |
1689 | * A syscall is enabled if it is traced for either entry or exit. | |
1690 | */ | |
12e579db | 1691 | long lttng_channel_syscall_mask(struct lttng_channel *channel, |
606828e4 | 1692 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1693 | { |
1694 | uint32_t len, sc_tables_len, bitmask_len; | |
1695 | int ret = 0, bit; | |
1696 | char *tmp_mask; | |
1697 | struct lttng_syscall_filter *filter; | |
1698 | ||
1699 | ret = get_user(len, &usyscall_mask->len); | |
1700 | if (ret) | |
1701 | return ret; | |
1702 | sc_tables_len = get_sc_tables_len(); | |
1703 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1704 | if (len < sc_tables_len) { | |
1705 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1706 | } | |
1707 | /* Array is large enough, we can copy array to user-space. */ | |
1708 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1709 | if (!tmp_mask) | |
1710 | return -ENOMEM; | |
1711 | filter = channel->sc_filter; | |
1712 | ||
f385fc5f | 1713 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1714 | char state; |
2f25059d MD |
1715 | |
1716 | if (channel->sc_table) { | |
3b82c4e1 MD |
1717 | if (!(READ_ONCE(channel->syscall_all_entry) |
1718 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1719 | state = test_bit(bit, filter->sc_entry) |
1720 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1721 | else |
1722 | state = 1; | |
1723 | } else { | |
1724 | state = 0; | |
1725 | } | |
1726 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1727 | } |
1728 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1729 | char state; |
2f25059d MD |
1730 | |
1731 | if (channel->compat_sc_table) { | |
3b82c4e1 MD |
1732 | if (!(READ_ONCE(channel->syscall_all_entry) |
1733 | || READ_ONCE(channel->syscall_all_exit)) && filter) | |
f385fc5f | 1734 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1735 | filter->sc_compat_entry) |
f385fc5f | 1736 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1737 | filter->sc_compat_exit); |
2f25059d MD |
1738 | else |
1739 | state = 1; | |
1740 | } else { | |
1741 | state = 0; | |
1742 | } | |
1743 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1744 | } |
1745 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1746 | ret = -EFAULT; | |
1747 | kfree(tmp_mask); | |
1748 | return ret; | |
1749 | } | |
082d4946 MD |
1750 | |
1751 | int lttng_abi_syscall_list(void) | |
1752 | { | |
1753 | struct file *syscall_list_file; | |
1754 | int file_fd, ret; | |
1755 | ||
4ac10b76 | 1756 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1757 | if (file_fd < 0) { |
1758 | ret = file_fd; | |
1759 | goto fd_error; | |
1760 | } | |
1761 | ||
1762 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1763 | <tng_syscall_list_fops, | |
1764 | NULL, O_RDWR); | |
1765 | if (IS_ERR(syscall_list_file)) { | |
1766 | ret = PTR_ERR(syscall_list_file); | |
1767 | goto file_error; | |
1768 | } | |
1769 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1770 | if (ret < 0) | |
1771 | goto open_error; | |
1772 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1773 | return file_fd; |
1774 | ||
1775 | open_error: | |
1776 | fput(syscall_list_file); | |
1777 | file_error: | |
1778 | put_unused_fd(file_fd); | |
1779 | fd_error: | |
1780 | return ret; | |
1781 | } |