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> |
a029f2a3 | 31 | #include <wrapper/limits.h> |
2df37e95 | 32 | #include <lttng/events.h> |
1ea8aa0a | 33 | #include <lttng/events-internal.h> |
8a8ac9a8 | 34 | #include <lttng/utils.h> |
259b6cb3 | 35 | |
f385fc5f 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 | |
8a8ac9a8 FD |
69 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
70 | long id); | |
8a8ac9a8 FD |
71 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, |
72 | long ret); | |
73 | ||
3a523f5b MD |
74 | /* |
75 | * Forward declarations for old kernels. | |
76 | */ | |
77 | struct mmsghdr; | |
78 | struct rlimit64; | |
79 | struct oldold_utsname; | |
80 | struct old_utsname; | |
81 | struct sel_arg_struct; | |
82 | struct mmap_arg_struct; | |
c0b71117 | 83 | struct file_handle; |
a292e6f1 | 84 | struct user_msghdr; |
3a523f5b | 85 | |
9eb15e8b MJ |
86 | /* |
87 | * Forward declaration for kernels >= 5.6 | |
88 | */ | |
89 | struct timex; | |
edfdcb68 MJ |
90 | struct timeval; |
91 | struct itimerval; | |
92 | struct itimerspec; | |
93 | ||
5f4c791e | 94 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
95 | typedef __kernel_old_time_t time_t; |
96 | #endif | |
9eb15e8b | 97 | |
80f87dd2 MD |
98 | #ifdef IA32_NR_syscalls |
99 | #define NR_compat_syscalls IA32_NR_syscalls | |
100 | #else | |
101 | #define NR_compat_syscalls NR_syscalls | |
102 | #endif | |
103 | ||
259b6cb3 MD |
104 | /* |
105 | * Create LTTng tracepoint probes. | |
106 | */ | |
107 | #define LTTNG_PACKAGE_BUILD | |
108 | #define CREATE_TRACE_POINTS | |
2655f9ad | 109 | #define TP_MODULE_NOINIT |
c075712b | 110 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 111 | |
a93244f8 MD |
112 | #define PARAMS(args...) args |
113 | ||
5b7ac358 | 114 | /* Handle unknown syscalls */ |
72a52753 | 115 | #undef TRACE_SYSTEM |
5b7ac358 | 116 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 117 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
118 | #undef TRACE_SYSTEM |
119 | ||
5b7ac358 | 120 | #undef TP_PROBE_CB |
fc4f7161 | 121 | |
5bcf4dbd FD |
122 | extern const struct trace_syscall_table sc_table; |
123 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 124 | |
2d6d88c6 | 125 | /* Event syscall exit table */ |
5bcf4dbd FD |
126 | extern const struct trace_syscall_table sc_exit_table; |
127 | extern const struct trace_syscall_table compat_sc_exit_table; | |
f385fc5f FD |
128 | |
129 | ||
fc4f7161 MD |
130 | #undef SC_EXIT |
131 | ||
a93244f8 | 132 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 133 | |
80f87dd2 | 134 | struct lttng_syscall_filter { |
badfe9f5 MD |
135 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
136 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
137 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
138 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
4fabf854 MD |
139 | |
140 | /* | |
141 | * Reference counters keeping track of number of events enabled | |
142 | * for each bit. | |
143 | */ | |
144 | u32 sc_entry_refcount_map[NR_syscalls]; | |
145 | u32 sc_exit_refcount_map[NR_syscalls]; | |
146 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
147 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
148 | }; |
149 | ||
3b82c4e1 | 150 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 151 | struct pt_regs *regs, long id) |
f405cfce | 152 | { |
1b7b9c65 | 153 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 154 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 155 | |
1b7b9c65 | 156 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 157 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 158 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 159 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 160 | else |
e2d5dbc7 | 161 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
162 | } |
163 | } | |
164 | ||
63aa9160 | 165 | static __always_inline |
e2d5dbc7 | 166 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 167 | void *func, unsigned int nrargs, |
63aa9160 | 168 | struct pt_regs *regs) |
259b6cb3 | 169 | { |
a67ba386 | 170 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 171 | |
63aa9160 | 172 | switch (nrargs) { |
259b6cb3 MD |
173 | case 0: |
174 | { | |
63aa9160 | 175 | void (*fptr)(void *__data) = func; |
259b6cb3 | 176 | |
e2d5dbc7 MD |
177 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
178 | fptr(event_priv->pub); | |
259b6cb3 MD |
179 | break; |
180 | } | |
181 | case 1: | |
182 | { | |
63aa9160 | 183 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 184 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 185 | |
1b7b9c65 | 186 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
187 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
188 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
189 | break; |
190 | } | |
191 | case 2: | |
192 | { | |
193 | void (*fptr)(void *__data, | |
194 | unsigned long arg0, | |
63aa9160 | 195 | unsigned long arg1) = func; |
1b7b9c65 | 196 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 197 | |
1b7b9c65 | 198 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
199 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
200 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
201 | break; |
202 | } | |
203 | case 3: | |
204 | { | |
205 | void (*fptr)(void *__data, | |
206 | unsigned long arg0, | |
207 | unsigned long arg1, | |
63aa9160 | 208 | unsigned long arg2) = 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]); | |
259b6cb3 MD |
214 | break; |
215 | } | |
216 | case 4: | |
217 | { | |
218 | void (*fptr)(void *__data, | |
219 | unsigned long arg0, | |
220 | unsigned long arg1, | |
221 | unsigned long arg2, | |
63aa9160 | 222 | unsigned long arg3) = func; |
1b7b9c65 | 223 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 224 | |
1b7b9c65 | 225 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
226 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
227 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
228 | break; |
229 | } | |
230 | case 5: | |
231 | { | |
232 | void (*fptr)(void *__data, | |
233 | unsigned long arg0, | |
234 | unsigned long arg1, | |
235 | unsigned long arg2, | |
236 | unsigned long arg3, | |
63aa9160 | 237 | unsigned long arg4) = func; |
1b7b9c65 | 238 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 239 | |
1b7b9c65 | 240 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
241 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
242 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
243 | break; |
244 | } | |
245 | case 6: | |
246 | { | |
247 | void (*fptr)(void *__data, | |
248 | unsigned long arg0, | |
249 | unsigned long arg1, | |
250 | unsigned long arg2, | |
251 | unsigned long arg3, | |
252 | unsigned long arg4, | |
63aa9160 | 253 | unsigned long arg5) = func; |
1b7b9c65 | 254 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 255 | |
1b7b9c65 | 256 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
257 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
258 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 259 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
260 | break; |
261 | } | |
262 | default: | |
263 | break; | |
264 | } | |
265 | } | |
266 | ||
63aa9160 FD |
267 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
268 | { | |
ac847066 | 269 | struct lttng_kernel_channel_buffer *chan = __data; |
3b82c4e1 | 270 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
271 | const struct trace_syscall_entry *table, *entry; |
272 | size_t table_len; | |
273 | ||
274 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 275 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
63aa9160 FD |
276 | |
277 | if (id < 0 || id >= NR_compat_syscalls | |
ac847066 | 278 | || (!READ_ONCE(chan->priv->parent.syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
279 | /* System call filtered out. */ |
280 | return; | |
281 | } | |
f385fc5f FD |
282 | table = compat_sc_table.table; |
283 | table_len = compat_sc_table.len; | |
ac847066 | 284 | unknown_action_list = &chan->priv->parent.sc_compat_unknown; |
63aa9160 | 285 | } else { |
ac847066 | 286 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
63aa9160 FD |
287 | |
288 | if (id < 0 || id >= NR_syscalls | |
ac847066 | 289 | || (!READ_ONCE(chan->priv->parent.syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
290 | /* System call filtered out. */ |
291 | return; | |
292 | } | |
f385fc5f FD |
293 | table = sc_table.table; |
294 | table_len = sc_table.len; | |
ac847066 | 295 | unknown_action_list = &chan->priv->parent.sc_unknown; |
63aa9160 FD |
296 | } |
297 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 298 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
299 | return; |
300 | } | |
3b82c4e1 MD |
301 | |
302 | entry = &table[id]; | |
303 | if (!entry->event_func) { | |
304 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
305 | return; |
306 | } | |
3b82c4e1 MD |
307 | |
308 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 309 | action_list = &chan->priv->parent.compat_sc_table[id]; |
3b82c4e1 | 310 | } else { |
ac847066 | 311 | action_list = &chan->priv->parent.sc_table[id]; |
3b82c4e1 MD |
312 | } |
313 | if (unlikely(hlist_empty(action_list))) | |
314 | return; | |
315 | ||
e2d5dbc7 | 316 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
317 | } |
318 | ||
8a8ac9a8 FD |
319 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
320 | long id) | |
321 | { | |
322 | struct lttng_event_notifier_group *group = __data; | |
323 | const struct trace_syscall_entry *table, *entry; | |
324 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
325 | size_t table_len; | |
326 | ||
327 | if (unlikely(in_compat_syscall())) { | |
328 | struct lttng_syscall_filter *filter = group->sc_filter; | |
329 | ||
330 | if (id < 0 || id >= NR_compat_syscalls | |
331 | || (!READ_ONCE(group->syscall_all_entry) && | |
332 | !test_bit(id, filter->sc_compat_entry))) { | |
333 | /* System call filtered out. */ | |
334 | return; | |
335 | } | |
f385fc5f FD |
336 | table = compat_sc_table.table; |
337 | table_len = compat_sc_table.len; | |
8a8ac9a8 FD |
338 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; |
339 | } else { | |
340 | struct lttng_syscall_filter *filter = group->sc_filter; | |
341 | ||
342 | if (id < 0 || id >= NR_syscalls | |
343 | || (!READ_ONCE(group->syscall_all_entry) && | |
344 | !test_bit(id, filter->sc_entry))) { | |
345 | /* System call filtered out. */ | |
346 | return; | |
347 | } | |
f385fc5f FD |
348 | table = sc_table.table; |
349 | table_len = sc_table.len; | |
8a8ac9a8 FD |
350 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; |
351 | } | |
352 | /* Check if the syscall id is out of bound. */ | |
353 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 354 | syscall_entry_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
355 | regs, id); |
356 | return; | |
357 | } | |
358 | ||
359 | entry = &table[id]; | |
e2d5dbc7 MD |
360 | if (!entry->event_func) { |
361 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
362 | regs, id); |
363 | return; | |
364 | } | |
365 | ||
366 | if (unlikely(in_compat_syscall())) { | |
367 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
368 | } else { | |
369 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
370 | } | |
371 | if (unlikely(hlist_empty(dispatch_list))) | |
372 | return; | |
373 | ||
e2d5dbc7 MD |
374 | syscall_entry_event_call_func(dispatch_list, |
375 | entry->event_func, entry->nrargs, regs); | |
8a8ac9a8 FD |
376 | } |
377 | ||
3b82c4e1 | 378 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 379 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 380 | { |
1b7b9c65 | 381 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 382 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 383 | |
1b7b9c65 | 384 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 385 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 386 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 387 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
388 | args); |
389 | else | |
e2d5dbc7 | 390 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 391 | } |
5b7ac358 MD |
392 | } |
393 | ||
3b82c4e1 | 394 | static __always_inline |
e2d5dbc7 | 395 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
396 | void *func, unsigned int nrargs, |
397 | struct pt_regs *regs, long ret) | |
5b7ac358 | 398 | { |
a67ba386 | 399 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 400 | |
3b82c4e1 | 401 | switch (nrargs) { |
5b7ac358 MD |
402 | case 0: |
403 | { | |
3b82c4e1 | 404 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 405 | |
e2d5dbc7 MD |
406 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
407 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
408 | break; |
409 | } | |
410 | case 1: | |
411 | { | |
412 | void (*fptr)(void *__data, | |
fc4f7161 | 413 | long ret, |
3b82c4e1 | 414 | unsigned long arg0) = func; |
1b7b9c65 | 415 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 416 | |
1b7b9c65 | 417 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
418 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
419 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
420 | break; |
421 | } | |
422 | case 2: | |
423 | { | |
424 | void (*fptr)(void *__data, | |
fc4f7161 | 425 | long ret, |
5b7ac358 | 426 | unsigned long arg0, |
3b82c4e1 | 427 | unsigned long arg1) = func; |
1b7b9c65 | 428 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 429 | |
1b7b9c65 | 430 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
431 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
432 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
433 | break; |
434 | } | |
435 | case 3: | |
436 | { | |
437 | void (*fptr)(void *__data, | |
fc4f7161 | 438 | long ret, |
5b7ac358 MD |
439 | unsigned long arg0, |
440 | unsigned long arg1, | |
3b82c4e1 | 441 | unsigned long arg2) = func; |
1b7b9c65 | 442 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 443 | |
1b7b9c65 | 444 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
445 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
446 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
447 | break; |
448 | } | |
449 | case 4: | |
450 | { | |
451 | void (*fptr)(void *__data, | |
fc4f7161 | 452 | long ret, |
5b7ac358 MD |
453 | unsigned long arg0, |
454 | unsigned long arg1, | |
455 | unsigned long arg2, | |
3b82c4e1 | 456 | unsigned long arg3) = func; |
1b7b9c65 | 457 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 458 | |
1b7b9c65 | 459 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
460 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
461 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
462 | break; |
463 | } | |
464 | case 5: | |
465 | { | |
466 | void (*fptr)(void *__data, | |
fc4f7161 | 467 | long ret, |
5b7ac358 MD |
468 | unsigned long arg0, |
469 | unsigned long arg1, | |
470 | unsigned long arg2, | |
471 | unsigned long arg3, | |
3b82c4e1 | 472 | unsigned long arg4) = func; |
1b7b9c65 | 473 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 474 | |
1b7b9c65 | 475 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
476 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
477 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
478 | break; |
479 | } | |
480 | case 6: | |
481 | { | |
482 | void (*fptr)(void *__data, | |
fc4f7161 | 483 | long ret, |
5b7ac358 MD |
484 | unsigned long arg0, |
485 | unsigned long arg1, | |
486 | unsigned long arg2, | |
487 | unsigned long arg3, | |
488 | unsigned long arg4, | |
3b82c4e1 | 489 | unsigned long arg5) = func; |
1b7b9c65 | 490 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 491 | |
1b7b9c65 | 492 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
493 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
494 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 495 | args[3], args[4], args[5]); |
5b7ac358 MD |
496 | break; |
497 | } | |
498 | default: | |
499 | break; | |
500 | } | |
501 | } | |
502 | ||
3b82c4e1 MD |
503 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
504 | { | |
ac847066 | 505 | struct lttng_kernel_channel_buffer *chan = __data; |
3b82c4e1 MD |
506 | struct hlist_head *action_list, *unknown_action_list; |
507 | const struct trace_syscall_entry *table, *entry; | |
508 | size_t table_len; | |
509 | long id; | |
510 | ||
511 | id = syscall_get_nr(current, regs); | |
512 | ||
513 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 514 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
3b82c4e1 MD |
515 | |
516 | if (id < 0 || id >= NR_compat_syscalls | |
ac847066 | 517 | || (!READ_ONCE(chan->priv->parent.syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
518 | /* System call filtered out. */ |
519 | return; | |
520 | } | |
f385fc5f FD |
521 | table = compat_sc_exit_table.table; |
522 | table_len = compat_sc_exit_table.len; | |
ac847066 | 523 | unknown_action_list = &chan->priv->parent.compat_sc_exit_unknown; |
3b82c4e1 | 524 | } else { |
ac847066 | 525 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
3b82c4e1 MD |
526 | |
527 | if (id < 0 || id >= NR_syscalls | |
ac847066 | 528 | || (!READ_ONCE(chan->priv->parent.syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
529 | /* System call filtered out. */ |
530 | return; | |
531 | } | |
f385fc5f FD |
532 | table = sc_exit_table.table; |
533 | table_len = sc_exit_table.len; | |
ac847066 | 534 | unknown_action_list = &chan->priv->parent.sc_exit_unknown; |
3b82c4e1 MD |
535 | } |
536 | if (unlikely(id < 0 || id >= table_len)) { | |
537 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
538 | return; | |
539 | } | |
540 | ||
541 | entry = &table[id]; | |
542 | if (!entry->event_func) { | |
543 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
544 | return; | |
545 | } | |
546 | ||
547 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 548 | action_list = &chan->priv->parent.compat_sc_exit_table[id]; |
3b82c4e1 | 549 | } else { |
ac847066 | 550 | action_list = &chan->priv->parent.sc_exit_table[id]; |
3b82c4e1 MD |
551 | } |
552 | if (unlikely(hlist_empty(action_list))) | |
553 | return; | |
554 | ||
e2d5dbc7 | 555 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
556 | regs, ret); |
557 | } | |
558 | ||
8a8ac9a8 FD |
559 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, |
560 | long ret) | |
561 | { | |
562 | struct lttng_event_notifier_group *group = __data; | |
563 | const struct trace_syscall_entry *table, *entry; | |
564 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
565 | size_t table_len; | |
566 | long id; | |
567 | ||
568 | id = syscall_get_nr(current, regs); | |
569 | ||
570 | if (unlikely(in_compat_syscall())) { | |
571 | struct lttng_syscall_filter *filter = group->sc_filter; | |
572 | ||
573 | if (id < 0 || id >= NR_compat_syscalls | |
574 | || (!READ_ONCE(group->syscall_all_exit) && | |
575 | !test_bit(id, filter->sc_compat_exit))) { | |
576 | /* System call filtered out. */ | |
577 | return; | |
578 | } | |
f385fc5f FD |
579 | table = compat_sc_exit_table.table; |
580 | table_len = compat_sc_exit_table.len; | |
8a8ac9a8 FD |
581 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; |
582 | } else { | |
583 | struct lttng_syscall_filter *filter = group->sc_filter; | |
584 | ||
585 | if (id < 0 || id >= NR_syscalls | |
586 | || (!READ_ONCE(group->syscall_all_exit) && | |
587 | !test_bit(id, filter->sc_exit))) { | |
588 | /* System call filtered out. */ | |
589 | return; | |
590 | } | |
f385fc5f FD |
591 | table = sc_exit_table.table; |
592 | table_len = sc_exit_table.len; | |
8a8ac9a8 FD |
593 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; |
594 | } | |
595 | /* Check if the syscall id is out of bound. */ | |
596 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 597 | syscall_exit_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
598 | regs, id, ret); |
599 | return; | |
600 | } | |
601 | ||
602 | entry = &table[id]; | |
e2d5dbc7 MD |
603 | if (!entry->event_func) { |
604 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
605 | regs, id); |
606 | return; | |
607 | } | |
608 | ||
609 | if (unlikely(in_compat_syscall())) { | |
610 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
611 | } else { | |
612 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
613 | } | |
614 | if (unlikely(hlist_empty(dispatch_list))) | |
615 | return; | |
616 | ||
e2d5dbc7 MD |
617 | syscall_exit_event_call_func(dispatch_list, |
618 | entry->event_func, entry->nrargs, regs, ret); | |
8a8ac9a8 | 619 | } |
33a39a3c MD |
620 | /* |
621 | * noinline to diminish caller stack size. | |
622 | * Should be called with sessions lock held. | |
623 | */ | |
49c50022 | 624 | static |
3b82c4e1 MD |
625 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
626 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
a67ba386 | 627 | enum sc_type type) |
259b6cb3 | 628 | { |
ac847066 MD |
629 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
630 | struct lttng_kernel_session *session = chan->parent.session; | |
259b6cb3 | 631 | unsigned int i; |
49c50022 | 632 | |
3b82c4e1 | 633 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 634 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 635 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
606828e4 | 636 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
637 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
638 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
639 | struct hlist_head *head; |
640 | bool found = false; | |
49c50022 MD |
641 | |
642 | if (!desc) { | |
643 | /* Unknown syscall */ | |
644 | continue; | |
645 | } | |
3b82c4e1 MD |
646 | if (lttng_desc_match_enabler(desc, |
647 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
648 | continue; | |
49c50022 | 649 | /* |
3b82c4e1 | 650 | * Check if already created. |
49c50022 | 651 | */ |
3b82c4e1 | 652 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 653 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 654 | desc->event_name); |
a67ba386 MD |
655 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
656 | if (event_recorder_priv->parent.desc == desc | |
657 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3b82c4e1 MD |
658 | found = true; |
659 | } | |
660 | if (found) | |
49c50022 | 661 | continue; |
3b82c4e1 MD |
662 | |
663 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 664 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
665 | switch (type) { |
666 | case SC_TYPE_ENTRY: | |
606828e4 MD |
667 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
668 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
669 | break; |
670 | case SC_TYPE_EXIT: | |
606828e4 MD |
671 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
672 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
673 | break; |
674 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
675 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
676 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
677 | break; |
678 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
679 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
680 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
681 | break; |
682 | } | |
606828e4 MD |
683 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
684 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
685 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
a67ba386 MD |
686 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, ev.instrumentation); |
687 | WARN_ON_ONCE(!event_recorder); | |
688 | if (IS_ERR(event_recorder)) { | |
49c50022 MD |
689 | /* |
690 | * If something goes wrong in event registration | |
691 | * after the first one, we have no choice but to | |
692 | * leave the previous events in there, until | |
693 | * deleted by session teardown. | |
694 | */ | |
a67ba386 | 695 | return PTR_ERR(event_recorder); |
49c50022 | 696 | } |
a67ba386 | 697 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
698 | } |
699 | return 0; | |
700 | } | |
701 | ||
33a39a3c MD |
702 | /* |
703 | * Should be called with sessions lock held. | |
704 | */ | |
a67ba386 | 705 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler) |
49c50022 | 706 | { |
ac847066 | 707 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
606828e4 | 708 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
709 | int ret; |
710 | ||
263b6c88 | 711 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 | 712 | |
ac847066 | 713 | if (!chan->priv->parent.sc_table) { |
259b6cb3 | 714 | /* create syscall table mapping syscall to events */ |
ac847066 | 715 | chan->priv->parent.sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 716 | * sc_table.len, GFP_KERNEL); |
ac847066 | 717 | if (!chan->priv->parent.sc_table) |
259b6cb3 MD |
718 | return -ENOMEM; |
719 | } | |
ac847066 | 720 | if (!chan->priv->parent.sc_exit_table) { |
5b7ac358 | 721 | /* create syscall table mapping syscall to events */ |
ac847066 | 722 | chan->priv->parent.sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 723 | * sc_exit_table.len, GFP_KERNEL); |
ac847066 | 724 | if (!chan->priv->parent.sc_exit_table) |
5b7ac358 MD |
725 | return -ENOMEM; |
726 | } | |
727 | ||
259b6cb3 | 728 | |
49c50022 | 729 | #ifdef CONFIG_COMPAT |
ac847066 | 730 | if (!chan->priv->parent.compat_sc_table) { |
49c50022 | 731 | /* create syscall table mapping compat syscall to events */ |
ac847066 | 732 | chan->priv->parent.compat_sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 733 | * compat_sc_table.len, GFP_KERNEL); |
ac847066 | 734 | if (!chan->priv->parent.compat_sc_table) |
49c50022 MD |
735 | return -ENOMEM; |
736 | } | |
5b7ac358 | 737 | |
ac847066 | 738 | if (!chan->priv->parent.compat_sc_exit_table) { |
5b7ac358 | 739 | /* create syscall table mapping compat syscall to events */ |
ac847066 | 740 | chan->priv->parent.compat_sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 741 | * compat_sc_exit_table.len, GFP_KERNEL); |
ac847066 | 742 | if (!chan->priv->parent.compat_sc_exit_table) |
5b7ac358 MD |
743 | return -ENOMEM; |
744 | } | |
49c50022 | 745 | #endif |
ac847066 | 746 | if (hlist_empty(&chan->priv->parent.sc_unknown)) { |
437d5aa5 | 747 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 748 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 749 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a | 750 | |
f405cfce | 751 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
752 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
753 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
754 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
755 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
756 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 757 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 758 | ev.instrumentation); |
a67ba386 MD |
759 | WARN_ON_ONCE(!event_recorder); |
760 | if (IS_ERR(event_recorder)) { | |
761 | return PTR_ERR(event_recorder); | |
f405cfce | 762 | } |
ac847066 | 763 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_unknown); |
f405cfce MD |
764 | } |
765 | ||
ac847066 | 766 | if (hlist_empty(&chan->priv->parent.sc_compat_unknown)) { |
437d5aa5 | 767 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 768 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 769 | struct lttng_kernel_event_recorder *event_recorder; |
b76dc1a0 MD |
770 | |
771 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
772 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
773 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
774 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
775 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
776 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 777 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 778 | ev.instrumentation); |
a67ba386 MD |
779 | WARN_ON_ONCE(!event_recorder); |
780 | if (IS_ERR(event_recorder)) { | |
781 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 782 | } |
ac847066 | 783 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_compat_unknown); |
b76dc1a0 MD |
784 | } |
785 | ||
ac847066 | 786 | if (hlist_empty(&chan->priv->parent.compat_sc_exit_unknown)) { |
437d5aa5 | 787 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 788 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 789 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a MD |
790 | |
791 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
792 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
793 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
794 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
795 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
796 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 797 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 798 | ev.instrumentation); |
a67ba386 MD |
799 | WARN_ON_ONCE(!event_recorder); |
800 | if (IS_ERR(event_recorder)) { | |
801 | return PTR_ERR(event_recorder); | |
5b7ac358 | 802 | } |
ac847066 | 803 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.compat_sc_exit_unknown); |
5b7ac358 MD |
804 | } |
805 | ||
ac847066 | 806 | if (hlist_empty(&chan->priv->parent.sc_exit_unknown)) { |
437d5aa5 | 807 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 808 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 809 | struct lttng_kernel_event_recorder *event_recorder; |
5b7ac358 MD |
810 | |
811 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
812 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
813 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
814 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
815 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
816 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 817 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 818 | ev.instrumentation); |
a67ba386 MD |
819 | WARN_ON_ONCE(!event_recorder); |
820 | if (IS_ERR(event_recorder)) { | |
821 | return PTR_ERR(event_recorder); | |
2f804c0a | 822 | } |
ac847066 | 823 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_exit_unknown); |
2f804c0a MD |
824 | } |
825 | ||
f385fc5f | 826 | ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, |
ac847066 | 827 | chan->priv->parent.sc_table, event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
828 | if (ret) |
829 | return ret; | |
f385fc5f | 830 | ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, |
ac847066 | 831 | chan->priv->parent.sc_exit_table, event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
832 | if (ret) |
833 | return ret; | |
5b7ac358 | 834 | |
49c50022 | 835 | #ifdef CONFIG_COMPAT |
f385fc5f | 836 | ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, |
ac847066 | 837 | chan->priv->parent.compat_sc_table, event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
838 | if (ret) |
839 | return ret; | |
f385fc5f | 840 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, |
ac847066 | 841 | chan->priv->parent.compat_sc_exit_table, event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
842 | if (ret) |
843 | return ret; | |
844 | #endif | |
badfe9f5 | 845 | |
ac847066 MD |
846 | if (!chan->priv->parent.sc_filter) { |
847 | chan->priv->parent.sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
badfe9f5 | 848 | GFP_KERNEL); |
ac847066 | 849 | if (!chan->priv->parent.sc_filter) |
badfe9f5 MD |
850 | return -ENOMEM; |
851 | } | |
852 | ||
ac847066 | 853 | if (!chan->priv->parent.sys_enter_registered) { |
80f87dd2 | 854 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
2d6d88c6 | 855 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
856 | if (ret) |
857 | return ret; | |
ac847066 | 858 | chan->priv->parent.sys_enter_registered = 1; |
80f87dd2 | 859 | } |
63728b02 MD |
860 | /* |
861 | * We change the name of sys_exit tracepoint due to namespace | |
862 | * conflict with sys_exit syscall entry. | |
863 | */ | |
ac847066 | 864 | if (!chan->priv->parent.sys_exit_registered) { |
80f87dd2 | 865 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
2d6d88c6 | 866 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
867 | if (ret) { |
868 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 869 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
870 | return ret; |
871 | } | |
ac847066 | 872 | chan->priv->parent.sys_exit_registered = 1; |
63728b02 | 873 | } |
259b6cb3 MD |
874 | return ret; |
875 | } | |
876 | ||
877 | /* | |
8a8ac9a8 FD |
878 | * Should be called with sessions lock held. |
879 | */ | |
880 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 881 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
882 | { |
883 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
884 | unsigned int i; | |
885 | int ret = 0; | |
886 | ||
887 | wrapper_vmalloc_sync_mappings(); | |
888 | ||
889 | if (!group->event_notifier_syscall_dispatch) { | |
890 | group->event_notifier_syscall_dispatch = | |
f385fc5f | 891 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
892 | GFP_KERNEL); |
893 | if (!group->event_notifier_syscall_dispatch) | |
894 | return -ENOMEM; | |
895 | ||
896 | /* Initialize all list_head */ | |
f385fc5f | 897 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
898 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); |
899 | ||
900 | /* Init the unknown syscall notifier list. */ | |
901 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
902 | } | |
903 | ||
904 | if (!group->event_notifier_exit_syscall_dispatch) { | |
905 | group->event_notifier_exit_syscall_dispatch = | |
f385fc5f | 906 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
907 | GFP_KERNEL); |
908 | if (!group->event_notifier_exit_syscall_dispatch) | |
909 | return -ENOMEM; | |
910 | ||
911 | /* Initialize all list_head */ | |
f385fc5f | 912 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
913 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); |
914 | ||
915 | /* Init the unknown exit syscall notifier list. */ | |
916 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
917 | } | |
918 | ||
919 | #ifdef CONFIG_COMPAT | |
920 | if (!group->event_notifier_compat_syscall_dispatch) { | |
921 | group->event_notifier_compat_syscall_dispatch = | |
f385fc5f | 922 | kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, |
8a8ac9a8 FD |
923 | GFP_KERNEL); |
924 | if (!group->event_notifier_syscall_dispatch) | |
925 | return -ENOMEM; | |
926 | ||
927 | /* Initialize all list_head */ | |
f385fc5f | 928 | for (i = 0; i < compat_sc_table.len; i++) |
8a8ac9a8 FD |
929 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); |
930 | ||
931 | /* Init the unknown syscall notifier list. */ | |
932 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
933 | } | |
934 | ||
935 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
936 | group->event_notifier_exit_compat_syscall_dispatch = | |
f385fc5f | 937 | kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, |
8a8ac9a8 FD |
938 | GFP_KERNEL); |
939 | if (!group->event_notifier_exit_syscall_dispatch) | |
940 | return -ENOMEM; | |
941 | ||
942 | /* Initialize all list_head */ | |
f385fc5f | 943 | for (i = 0; i < compat_sc_exit_table.len; i++) |
8a8ac9a8 FD |
944 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); |
945 | ||
946 | /* Init the unknown exit syscall notifier list. */ | |
947 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
948 | } | |
949 | #endif | |
950 | ||
951 | if (!group->sc_filter) { | |
952 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
953 | GFP_KERNEL); | |
954 | if (!group->sc_filter) | |
955 | return -ENOMEM; | |
956 | } | |
957 | ||
958 | if (!group->sys_enter_registered) { | |
959 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
960 | (void *) syscall_entry_event_notifier_probe, group); | |
961 | if (ret) | |
962 | return ret; | |
963 | group->sys_enter_registered = 1; | |
964 | } | |
965 | ||
966 | if (!group->sys_exit_registered) { | |
967 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
968 | (void *) syscall_exit_event_notifier_probe, group); | |
969 | if (ret) { | |
970 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
971 | (void *) syscall_entry_event_notifier_probe, group)); | |
972 | return ret; | |
973 | } | |
974 | group->sys_exit_registered = 1; | |
975 | } | |
976 | ||
977 | return ret; | |
978 | } | |
979 | ||
980 | static | |
981 | int create_unknown_event_notifier( | |
982 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
983 | enum sc_type type) | |
984 | { | |
a67ba386 MD |
985 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
986 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 987 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 988 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
606828e4 | 989 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 | 990 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 991 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
992 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
993 | event_notifier_enabler); | |
994 | struct hlist_head *unknown_dispatch_list; | |
995 | int ret = 0; | |
996 | bool found = false; | |
606828e4 MD |
997 | enum lttng_kernel_abi_syscall_abi abi; |
998 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
999 | struct hlist_head *head; |
1000 | ||
1001 | switch (type) { | |
1002 | case SC_TYPE_ENTRY: | |
1003 | desc = &__event_desc___syscall_entry_unknown; | |
1004 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
606828e4 MD |
1005 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1006 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1007 | break; |
1008 | case SC_TYPE_EXIT: | |
1009 | desc = &__event_desc___syscall_exit_unknown; | |
1010 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
606828e4 MD |
1011 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1012 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1013 | break; |
1014 | case SC_TYPE_COMPAT_ENTRY: | |
1015 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1016 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1017 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1018 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1019 | break; |
1020 | case SC_TYPE_COMPAT_EXIT: | |
1021 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1022 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1023 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1024 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1025 | break; |
1026 | default: | |
1027 | BUG_ON(1); | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Check if already created. | |
1032 | */ | |
1033 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1034 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1035 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1036 | if (event_notifier_priv->parent.desc == desc && | |
1037 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
1038 | found = true; |
1039 | } | |
1040 | if (found) | |
1041 | goto end; | |
1042 | ||
1043 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 1044 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 1045 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 1046 | |
606828e4 | 1047 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 1048 | |
606828e4 | 1049 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
1050 | event_notifier_param.event.u.syscall.abi = abi; |
1051 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1052 | ||
a67ba386 MD |
1053 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1054 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 1055 | event_notifier_param.event.instrumentation); |
a67ba386 | 1056 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 1057 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 1058 | desc->event_name); |
8a8ac9a8 FD |
1059 | ret = -ENOMEM; |
1060 | goto end; | |
1061 | } | |
1062 | ||
a67ba386 | 1063 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
1064 | |
1065 | end: | |
1066 | return ret; | |
1067 | } | |
1068 | ||
1069 | static int create_matching_event_notifiers( | |
1070 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 1071 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
1072 | size_t table_len, enum sc_type type) |
1073 | { | |
1074 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 1075 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1076 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1077 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1078 | unsigned int i; |
1079 | int ret = 0; | |
1080 | ||
1081 | /* iterate over all syscall and create event_notifier that match */ | |
1082 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
1083 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1084 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 1085 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
1086 | struct hlist_head *head; |
1087 | int found = 0; | |
1088 | ||
1089 | desc = table[i].desc; | |
1090 | if (!desc) { | |
1091 | /* Unknown syscall */ | |
1092 | continue; | |
1093 | } | |
1094 | ||
1095 | if (!lttng_desc_match_enabler(desc, | |
1096 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1097 | continue; | |
1098 | ||
1099 | /* | |
1100 | * Check if already created. | |
1101 | */ | |
1102 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1103 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1104 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1105 | if (event_notifier_priv->parent.desc == desc | |
1106 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
8a8ac9a8 FD |
1107 | found = 1; |
1108 | } | |
1109 | if (found) | |
1110 | continue; | |
1111 | ||
1112 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1113 | switch (type) { | |
1114 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1115 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1116 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1117 | break; |
1118 | case SC_TYPE_EXIT: | |
606828e4 MD |
1119 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1120 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1121 | break; |
1122 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1123 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1124 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1125 | break; |
1126 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1127 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1128 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1129 | break; |
1130 | } | |
437d5aa5 | 1131 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1132 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1133 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1134 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1135 | |
99f52fcc FD |
1136 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1137 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1138 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1139 | if (IS_ERR(event_notifier)) { |
1140 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1141 | desc->event_name); |
8a8ac9a8 FD |
1142 | ret = -ENOMEM; |
1143 | goto end; | |
1144 | } | |
1145 | ||
a67ba386 | 1146 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1147 | } |
1148 | ||
1149 | end: | |
1150 | return ret; | |
1151 | ||
1152 | } | |
1153 | ||
a67ba386 MD |
1154 | int lttng_syscalls_create_matching_event_notifiers( |
1155 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1156 | { |
1157 | int ret; | |
1158 | struct lttng_enabler *base_enabler = | |
1159 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
606828e4 | 1160 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1161 | base_enabler->event_param.u.syscall.entryexit; |
1162 | ||
606828e4 | 1163 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1164 | ret = create_matching_event_notifiers(event_notifier_enabler, |
f385fc5f | 1165 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1166 | if (ret) |
1167 | goto end; | |
1168 | ||
1169 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
f385fc5f | 1170 | compat_sc_table.table, compat_sc_table.len, |
8a8ac9a8 FD |
1171 | SC_TYPE_COMPAT_ENTRY); |
1172 | if (ret) | |
1173 | goto end; | |
1174 | ||
1175 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1176 | SC_TYPE_ENTRY); | |
1177 | if (ret) | |
1178 | goto end; | |
1179 | ||
1180 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1181 | SC_TYPE_COMPAT_ENTRY); | |
1182 | if (ret) | |
1183 | goto end; | |
1184 | } | |
1185 | ||
606828e4 | 1186 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1187 | ret = create_matching_event_notifiers(event_notifier_enabler, |
f385fc5f | 1188 | sc_exit_table.table, sc_exit_table.len, |
8a8ac9a8 FD |
1189 | SC_TYPE_EXIT); |
1190 | if (ret) | |
1191 | goto end; | |
1192 | ||
1193 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1194 | SC_TYPE_EXIT); | |
1195 | if (ret) | |
1196 | goto end; | |
1197 | ||
1198 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
f385fc5f | 1199 | compat_sc_exit_table.table, compat_sc_exit_table.len, |
8a8ac9a8 FD |
1200 | SC_TYPE_COMPAT_EXIT); |
1201 | if (ret) | |
1202 | goto end; | |
1203 | ||
1204 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1205 | SC_TYPE_COMPAT_EXIT); | |
1206 | if (ret) | |
1207 | goto end; | |
1208 | } | |
1209 | ||
1210 | end: | |
1211 | return ret; | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1216 | */ |
3b82c4e1 | 1217 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1218 | struct lttng_event_notifier_group *event_notifier_group) |
1219 | { | |
1220 | int ret; | |
1221 | ||
1222 | /* | |
1223 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1224 | * At the moment, we don't think it's desirable to have one fired | |
1225 | * event_notifier for the entry and one for the exit of a syscall. | |
1226 | */ | |
1227 | if (event_notifier_group->sys_enter_registered) { | |
1228 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1229 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1230 | if (ret) | |
1231 | return ret; | |
1232 | event_notifier_group->sys_enter_registered = 0; | |
1233 | } | |
1234 | if (event_notifier_group->sys_exit_registered) { | |
1235 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1236 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1237 | if (ret) | |
1238 | return ret; | |
1239 | event_notifier_group->sys_enter_registered = 0; | |
1240 | } | |
1241 | ||
1242 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1243 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1244 | #ifdef CONFIG_COMPAT | |
1245 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1246 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1247 | #endif | |
1248 | return 0; | |
1249 | } | |
1250 | ||
ac847066 | 1251 | int lttng_syscalls_unregister_channel(struct lttng_kernel_channel_buffer *chan) |
259b6cb3 MD |
1252 | { |
1253 | int ret; | |
1254 | ||
ac847066 | 1255 | if (!chan->priv->parent.sc_table) |
259b6cb3 | 1256 | return 0; |
ac847066 | 1257 | if (chan->priv->parent.sys_enter_registered) { |
2d9cd7f3 | 1258 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1259 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1260 | if (ret) |
1261 | return ret; | |
ac847066 | 1262 | chan->priv->parent.sys_enter_registered = 0; |
80f87dd2 | 1263 | } |
ac847066 | 1264 | if (chan->priv->parent.sys_exit_registered) { |
2d9cd7f3 | 1265 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1266 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1267 | if (ret) |
1268 | return ret; | |
ac847066 | 1269 | chan->priv->parent.sys_exit_registered = 0; |
80f87dd2 | 1270 | } |
badfe9f5 MD |
1271 | return 0; |
1272 | } | |
1273 | ||
ac847066 | 1274 | int lttng_syscalls_destroy_event(struct lttng_kernel_channel_buffer *chan) |
badfe9f5 | 1275 | { |
ac847066 MD |
1276 | kfree(chan->priv->parent.sc_table); |
1277 | kfree(chan->priv->parent.sc_exit_table); | |
49c50022 | 1278 | #ifdef CONFIG_COMPAT |
ac847066 MD |
1279 | kfree(chan->priv->parent.compat_sc_table); |
1280 | kfree(chan->priv->parent.compat_sc_exit_table); | |
49c50022 | 1281 | #endif |
ac847066 | 1282 | kfree(chan->priv->parent.sc_filter); |
80f87dd2 MD |
1283 | return 0; |
1284 | } | |
1285 | ||
1286 | static | |
1287 | int get_syscall_nr(const char *syscall_name) | |
1288 | { | |
1289 | int syscall_nr = -1; | |
1290 | int i; | |
1291 | ||
f385fc5f | 1292 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 1293 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1294 | const char *it_name; |
80f87dd2 | 1295 | |
f385fc5f | 1296 | entry = &sc_table.table[i]; |
80f87dd2 MD |
1297 | if (!entry->desc) |
1298 | continue; | |
437d5aa5 | 1299 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1300 | it_name += strlen(SYSCALL_ENTRY_STR); |
1301 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1302 | syscall_nr = i; |
1303 | break; | |
1304 | } | |
1305 | } | |
1306 | return syscall_nr; | |
1307 | } | |
1308 | ||
1309 | static | |
1310 | int get_compat_syscall_nr(const char *syscall_name) | |
1311 | { | |
1312 | int syscall_nr = -1; | |
1313 | int i; | |
1314 | ||
f385fc5f | 1315 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 1316 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1317 | const char *it_name; |
80f87dd2 | 1318 | |
f385fc5f | 1319 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
1320 | if (!entry->desc) |
1321 | continue; | |
437d5aa5 | 1322 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1323 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1324 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1325 | syscall_nr = i; |
1326 | break; | |
1327 | } | |
1328 | } | |
1329 | return syscall_nr; | |
1330 | } | |
1331 | ||
12e579db MD |
1332 | static |
1333 | uint32_t get_sc_tables_len(void) | |
1334 | { | |
f385fc5f | 1335 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
1336 | } |
1337 | ||
badfe9f5 | 1338 | static |
ade8a729 FD |
1339 | const char *get_syscall_name(const char *desc_name, |
1340 | enum lttng_syscall_abi abi, | |
1341 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1342 | { |
badfe9f5 | 1343 | size_t prefix_len = 0; |
80f87dd2 | 1344 | |
80f87dd2 | 1345 | |
ade8a729 | 1346 | switch (entryexit) { |
badfe9f5 | 1347 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1348 | switch (abi) { |
badfe9f5 MD |
1349 | case LTTNG_SYSCALL_ABI_NATIVE: |
1350 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1351 | break; | |
1352 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1353 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1354 | break; | |
80f87dd2 | 1355 | } |
badfe9f5 MD |
1356 | break; |
1357 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1358 | switch (abi) { |
badfe9f5 MD |
1359 | case LTTNG_SYSCALL_ABI_NATIVE: |
1360 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1361 | break; | |
1362 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1363 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1364 | break; | |
80f87dd2 | 1365 | } |
badfe9f5 | 1366 | break; |
80f87dd2 | 1367 | } |
badfe9f5 | 1368 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1369 | return desc_name + prefix_len; |
badfe9f5 MD |
1370 | } |
1371 | ||
ade8a729 FD |
1372 | static |
1373 | int lttng_syscall_filter_enable( | |
1374 | struct lttng_syscall_filter *filter, | |
1375 | const char *desc_name, enum lttng_syscall_abi abi, | |
1376 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1377 | { |
badfe9f5 MD |
1378 | const char *syscall_name; |
1379 | unsigned long *bitmap; | |
4fabf854 | 1380 | u32 *refcount_map; |
badfe9f5 MD |
1381 | int syscall_nr; |
1382 | ||
ade8a729 | 1383 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1384 | |
ade8a729 | 1385 | switch (abi) { |
badfe9f5 MD |
1386 | case LTTNG_SYSCALL_ABI_NATIVE: |
1387 | syscall_nr = get_syscall_nr(syscall_name); | |
1388 | break; | |
1389 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1390 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1391 | break; | |
1392 | default: | |
1393 | return -EINVAL; | |
80f87dd2 | 1394 | } |
badfe9f5 MD |
1395 | if (syscall_nr < 0) |
1396 | return -ENOENT; | |
1397 | ||
ade8a729 | 1398 | switch (entryexit) { |
badfe9f5 | 1399 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1400 | switch (abi) { |
badfe9f5 MD |
1401 | case LTTNG_SYSCALL_ABI_NATIVE: |
1402 | bitmap = filter->sc_entry; | |
4fabf854 | 1403 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1404 | break; |
1405 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1406 | bitmap = filter->sc_compat_entry; | |
4fabf854 | 1407 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1408 | break; |
6d9694d8 MD |
1409 | default: |
1410 | return -EINVAL; | |
80f87dd2 | 1411 | } |
badfe9f5 MD |
1412 | break; |
1413 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1414 | switch (abi) { |
badfe9f5 MD |
1415 | case LTTNG_SYSCALL_ABI_NATIVE: |
1416 | bitmap = filter->sc_exit; | |
4fabf854 | 1417 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1418 | break; |
1419 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1420 | bitmap = filter->sc_compat_exit; | |
4fabf854 | 1421 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1422 | break; |
6d9694d8 MD |
1423 | default: |
1424 | return -EINVAL; | |
80f87dd2 | 1425 | } |
badfe9f5 MD |
1426 | break; |
1427 | default: | |
1428 | return -EINVAL; | |
80f87dd2 | 1429 | } |
4fabf854 MD |
1430 | if (refcount_map[syscall_nr] == U32_MAX) |
1431 | return -EOVERFLOW; | |
1432 | if (refcount_map[syscall_nr]++ == 0) | |
1433 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1434 | return 0; |
80f87dd2 MD |
1435 | } |
1436 | ||
8a8ac9a8 | 1437 | int lttng_syscall_filter_enable_event_notifier( |
a67ba386 | 1438 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1439 | { |
a67ba386 MD |
1440 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
1441 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; | |
8a8ac9a8 FD |
1442 | struct hlist_head *dispatch_list; |
1443 | int ret = 0; | |
1444 | ||
a67ba386 | 1445 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1446 | |
4fabf854 MD |
1447 | /* Skip unknown syscall */ |
1448 | if (syscall_id == -1U) | |
1449 | return 0; | |
1450 | ||
8a8ac9a8 | 1451 | ret = lttng_syscall_filter_enable(group->sc_filter, |
a67ba386 MD |
1452 | event_notifier->priv->parent.desc->event_name, |
1453 | event_notifier->priv->parent.u.syscall.abi, | |
1454 | event_notifier->priv->parent.u.syscall.entryexit); | |
4fabf854 MD |
1455 | if (ret) |
1456 | return ret; | |
8a8ac9a8 | 1457 | |
a67ba386 | 1458 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 1459 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 1460 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1461 | case LTTNG_SYSCALL_ABI_NATIVE: |
1462 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1463 | break; | |
1464 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1465 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1466 | break; | |
6866b1c7 MJ |
1467 | default: |
1468 | ret = -EINVAL; | |
1469 | goto end; | |
8a8ac9a8 FD |
1470 | } |
1471 | break; | |
1472 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 1473 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1474 | case LTTNG_SYSCALL_ABI_NATIVE: |
1475 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1476 | break; | |
1477 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1478 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1479 | break; | |
6866b1c7 MJ |
1480 | default: |
1481 | ret = -EINVAL; | |
1482 | goto end; | |
8a8ac9a8 FD |
1483 | } |
1484 | break; | |
6866b1c7 MJ |
1485 | default: |
1486 | ret = -EINVAL; | |
1487 | goto end; | |
8a8ac9a8 FD |
1488 | } |
1489 | ||
a67ba386 | 1490 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
1491 | |
1492 | end: | |
4fabf854 | 1493 | return ret; |
8a8ac9a8 FD |
1494 | } |
1495 | ||
ade8a729 | 1496 | int lttng_syscall_filter_enable_event( |
ac847066 | 1497 | struct lttng_kernel_channel_buffer *channel, |
a67ba386 | 1498 | struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 1499 | { |
4fabf854 MD |
1500 | unsigned int syscall_id = event_recorder->priv->parent.u.syscall.syscall_id; |
1501 | ||
a67ba386 | 1502 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 | 1503 | |
4fabf854 MD |
1504 | /* Skip unknown syscall */ |
1505 | if (syscall_id == -1U) | |
1506 | return 0; | |
1507 | ||
ac847066 | 1508 | return lttng_syscall_filter_enable(channel->priv->parent.sc_filter, |
a67ba386 MD |
1509 | event_recorder->priv->parent.desc->event_name, |
1510 | event_recorder->priv->parent.u.syscall.abi, | |
1511 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1512 | } |
1513 | ||
1514 | static | |
1515 | int lttng_syscall_filter_disable( | |
1516 | struct lttng_syscall_filter *filter, | |
1517 | const char *desc_name, enum lttng_syscall_abi abi, | |
1518 | enum lttng_syscall_entryexit entryexit) | |
1519 | { | |
badfe9f5 MD |
1520 | const char *syscall_name; |
1521 | unsigned long *bitmap; | |
4fabf854 | 1522 | u32 *refcount_map; |
badfe9f5 | 1523 | int syscall_nr; |
80f87dd2 | 1524 | |
ade8a729 | 1525 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1526 | |
ade8a729 | 1527 | switch (abi) { |
badfe9f5 MD |
1528 | case LTTNG_SYSCALL_ABI_NATIVE: |
1529 | syscall_nr = get_syscall_nr(syscall_name); | |
1530 | break; | |
1531 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1532 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1533 | break; | |
1534 | default: | |
1535 | return -EINVAL; | |
80f87dd2 | 1536 | } |
badfe9f5 MD |
1537 | if (syscall_nr < 0) |
1538 | return -ENOENT; | |
80f87dd2 | 1539 | |
ade8a729 | 1540 | switch (entryexit) { |
badfe9f5 | 1541 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1542 | switch (abi) { |
badfe9f5 MD |
1543 | case LTTNG_SYSCALL_ABI_NATIVE: |
1544 | bitmap = filter->sc_entry; | |
4fabf854 | 1545 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1546 | break; |
1547 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1548 | bitmap = filter->sc_compat_entry; | |
4fabf854 | 1549 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1550 | break; |
6d9694d8 MD |
1551 | default: |
1552 | return -EINVAL; | |
80f87dd2 | 1553 | } |
badfe9f5 MD |
1554 | break; |
1555 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1556 | switch (abi) { |
badfe9f5 MD |
1557 | case LTTNG_SYSCALL_ABI_NATIVE: |
1558 | bitmap = filter->sc_exit; | |
4fabf854 | 1559 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1560 | break; |
1561 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1562 | bitmap = filter->sc_compat_exit; | |
4fabf854 | 1563 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1564 | break; |
6d9694d8 MD |
1565 | default: |
1566 | return -EINVAL; | |
80f87dd2 | 1567 | } |
badfe9f5 MD |
1568 | break; |
1569 | default: | |
1570 | return -EINVAL; | |
80f87dd2 | 1571 | } |
4fabf854 MD |
1572 | if (refcount_map[syscall_nr] == 0) |
1573 | return -ENOENT; | |
1574 | if (--refcount_map[syscall_nr] == 0) | |
1575 | bitmap_clear(bitmap, syscall_nr, 1); | |
badfe9f5 | 1576 | return 0; |
259b6cb3 | 1577 | } |
2d2464bd | 1578 | |
8a8ac9a8 | 1579 | int lttng_syscall_filter_disable_event_notifier( |
a67ba386 | 1580 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1581 | { |
a67ba386 | 1582 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
4fabf854 | 1583 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; |
8a8ac9a8 FD |
1584 | int ret; |
1585 | ||
a67ba386 | 1586 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1587 | |
4fabf854 MD |
1588 | /* Skip unknown syscall */ |
1589 | if (syscall_id == -1U) | |
1590 | return 0; | |
1591 | ||
8a8ac9a8 | 1592 | ret = lttng_syscall_filter_disable(group->sc_filter, |
a67ba386 MD |
1593 | event_notifier->priv->parent.desc->event_name, |
1594 | event_notifier->priv->parent.u.syscall.abi, | |
1595 | event_notifier->priv->parent.u.syscall.entryexit); | |
4fabf854 MD |
1596 | if (ret) |
1597 | return ret; | |
8a8ac9a8 | 1598 | |
a67ba386 | 1599 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
1600 | return 0; |
1601 | } | |
1602 | ||
ade8a729 | 1603 | int lttng_syscall_filter_disable_event( |
ac847066 | 1604 | struct lttng_kernel_channel_buffer *channel, |
a67ba386 | 1605 | struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 | 1606 | { |
4fabf854 MD |
1607 | unsigned int syscall_id = event_recorder->priv->parent.u.syscall.syscall_id; |
1608 | ||
1609 | /* Skip unknown syscall */ | |
1610 | if (syscall_id == -1U) | |
1611 | return 0; | |
1612 | ||
ac847066 | 1613 | return lttng_syscall_filter_disable(channel->priv->parent.sc_filter, |
a67ba386 MD |
1614 | event_recorder->priv->parent.desc->event_name, |
1615 | event_recorder->priv->parent.u.syscall.abi, | |
1616 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1617 | } |
1618 | ||
2d2464bd MD |
1619 | static |
1620 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1621 | { | |
1622 | const struct trace_syscall_entry *entry; | |
1623 | int iter = 0; | |
1624 | ||
f385fc5f FD |
1625 | for (entry = sc_table.table; |
1626 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1627 | entry++) { |
1628 | if (iter++ >= *pos) | |
1629 | return entry; | |
1630 | } | |
f385fc5f FD |
1631 | for (entry = compat_sc_table.table; |
1632 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1633 | entry++) { |
1634 | if (iter++ >= *pos) | |
1635 | return entry; | |
1636 | } | |
1637 | /* End of list */ | |
1638 | return NULL; | |
1639 | } | |
1640 | ||
1641 | static | |
1642 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1643 | { | |
1644 | return (void *) syscall_list_get_entry(pos); | |
1645 | } | |
1646 | ||
1647 | static | |
1648 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1649 | { | |
1650 | (*ppos)++; | |
1651 | return (void *) syscall_list_get_entry(ppos); | |
1652 | } | |
1653 | ||
1654 | static | |
1655 | void syscall_list_stop(struct seq_file *m, void *p) | |
1656 | { | |
1657 | } | |
1658 | ||
12e579db MD |
1659 | static |
1660 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1661 | const struct trace_syscall_entry **table, | |
1662 | unsigned int *bitness) | |
1663 | { | |
f385fc5f | 1664 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1665 | if (bitness) |
1666 | *bitness = BITS_PER_LONG; | |
1667 | if (table) | |
f385fc5f | 1668 | *table = sc_table.table; |
12e579db MD |
1669 | return 0; |
1670 | } | |
f385fc5f FD |
1671 | if (!(entry >= compat_sc_table.table |
1672 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1673 | return -EINVAL; |
1674 | } | |
1675 | if (bitness) | |
1676 | *bitness = 32; | |
1677 | if (table) | |
f385fc5f | 1678 | *table = compat_sc_table.table; |
12e579db MD |
1679 | return 0; |
1680 | } | |
1681 | ||
2d2464bd MD |
1682 | static |
1683 | int syscall_list_show(struct seq_file *m, void *p) | |
1684 | { | |
1685 | const struct trace_syscall_entry *table, *entry = p; | |
1686 | unsigned int bitness; | |
d4291869 | 1687 | unsigned long index; |
12e579db | 1688 | int ret; |
d4291869 | 1689 | const char *name; |
2d2464bd | 1690 | |
12e579db MD |
1691 | ret = get_sc_table(entry, &table, &bitness); |
1692 | if (ret) | |
1693 | return ret; | |
f4855b46 MD |
1694 | if (!entry->desc) |
1695 | return 0; | |
f385fc5f | 1696 | if (table == sc_table.table) { |
d4291869 | 1697 | index = entry - table; |
437d5aa5 | 1698 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1699 | } else { |
f385fc5f | 1700 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1701 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1702 | } |
12e579db | 1703 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1704 | index, name, bitness); |
2d2464bd MD |
1705 | return 0; |
1706 | } | |
1707 | ||
1708 | static | |
1709 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1710 | .start = syscall_list_start, | |
1711 | .next = syscall_list_next, | |
1712 | .stop = syscall_list_stop, | |
1713 | .show = syscall_list_show, | |
1714 | }; | |
1715 | ||
1716 | static | |
1717 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1718 | { | |
1719 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1720 | } | |
1721 | ||
1722 | const struct file_operations lttng_syscall_list_fops = { | |
1723 | .owner = THIS_MODULE, | |
1724 | .open = lttng_syscall_list_open, | |
1725 | .read = seq_read, | |
1726 | .llseek = seq_lseek, | |
1727 | .release = seq_release, | |
1728 | }; | |
12e579db | 1729 | |
badfe9f5 MD |
1730 | /* |
1731 | * A syscall is enabled if it is traced for either entry or exit. | |
1732 | */ | |
ac847066 | 1733 | long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer *channel, |
606828e4 | 1734 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1735 | { |
1736 | uint32_t len, sc_tables_len, bitmask_len; | |
1737 | int ret = 0, bit; | |
1738 | char *tmp_mask; | |
1739 | struct lttng_syscall_filter *filter; | |
1740 | ||
1741 | ret = get_user(len, &usyscall_mask->len); | |
1742 | if (ret) | |
1743 | return ret; | |
1744 | sc_tables_len = get_sc_tables_len(); | |
1745 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1746 | if (len < sc_tables_len) { | |
1747 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1748 | } | |
1749 | /* Array is large enough, we can copy array to user-space. */ | |
1750 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1751 | if (!tmp_mask) | |
1752 | return -ENOMEM; | |
ac847066 | 1753 | filter = channel->priv->parent.sc_filter; |
12e579db | 1754 | |
f385fc5f | 1755 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1756 | char state; |
2f25059d | 1757 | |
ac847066 MD |
1758 | if (channel->priv->parent.sc_table) { |
1759 | if (!(READ_ONCE(channel->priv->parent.syscall_all_entry) | |
1760 | || READ_ONCE(channel->priv->parent.syscall_all_exit)) && filter) | |
badfe9f5 MD |
1761 | state = test_bit(bit, filter->sc_entry) |
1762 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1763 | else |
1764 | state = 1; | |
1765 | } else { | |
1766 | state = 0; | |
1767 | } | |
1768 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1769 | } |
1770 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1771 | char state; |
2f25059d | 1772 | |
ac847066 MD |
1773 | if (channel->priv->parent.compat_sc_table) { |
1774 | if (!(READ_ONCE(channel->priv->parent.syscall_all_entry) | |
1775 | || READ_ONCE(channel->priv->parent.syscall_all_exit)) && filter) | |
f385fc5f | 1776 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1777 | filter->sc_compat_entry) |
f385fc5f | 1778 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1779 | filter->sc_compat_exit); |
2f25059d MD |
1780 | else |
1781 | state = 1; | |
1782 | } else { | |
1783 | state = 0; | |
1784 | } | |
1785 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1786 | } |
1787 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1788 | ret = -EFAULT; | |
1789 | kfree(tmp_mask); | |
1790 | return ret; | |
1791 | } | |
082d4946 MD |
1792 | |
1793 | int lttng_abi_syscall_list(void) | |
1794 | { | |
1795 | struct file *syscall_list_file; | |
1796 | int file_fd, ret; | |
1797 | ||
4ac10b76 | 1798 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1799 | if (file_fd < 0) { |
1800 | ret = file_fd; | |
1801 | goto fd_error; | |
1802 | } | |
1803 | ||
1804 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1805 | <tng_syscall_list_fops, | |
1806 | NULL, O_RDWR); | |
1807 | if (IS_ERR(syscall_list_file)) { | |
1808 | ret = PTR_ERR(syscall_list_file); | |
1809 | goto file_error; | |
1810 | } | |
1811 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1812 | if (ret < 0) | |
1813 | goto open_error; | |
1814 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1815 | return file_fd; |
1816 | ||
1817 | open_error: | |
1818 | fput(syscall_list_file); | |
1819 | file_error: | |
1820 | put_unused_fd(file_fd); | |
1821 | fd_error: | |
1822 | return ret; | |
1823 | } |