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 | ||
ae77b692 MD |
274 | #ifdef CONFIG_X86_X32_ABI |
275 | if (in_x32_syscall()) { | |
276 | /* x32 system calls are not supported. */ | |
277 | return; | |
278 | } | |
279 | #endif | |
63aa9160 | 280 | if (unlikely(in_compat_syscall())) { |
ac847066 | 281 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
63aa9160 FD |
282 | |
283 | if (id < 0 || id >= NR_compat_syscalls | |
ac847066 | 284 | || (!READ_ONCE(chan->priv->parent.syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
285 | /* System call filtered out. */ |
286 | return; | |
287 | } | |
f385fc5f FD |
288 | table = compat_sc_table.table; |
289 | table_len = compat_sc_table.len; | |
ac847066 | 290 | unknown_action_list = &chan->priv->parent.sc_compat_unknown; |
63aa9160 | 291 | } else { |
ac847066 | 292 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
63aa9160 FD |
293 | |
294 | if (id < 0 || id >= NR_syscalls | |
ac847066 | 295 | || (!READ_ONCE(chan->priv->parent.syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
296 | /* System call filtered out. */ |
297 | return; | |
298 | } | |
f385fc5f FD |
299 | table = sc_table.table; |
300 | table_len = sc_table.len; | |
ac847066 | 301 | unknown_action_list = &chan->priv->parent.sc_unknown; |
63aa9160 FD |
302 | } |
303 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 304 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
305 | return; |
306 | } | |
3b82c4e1 MD |
307 | |
308 | entry = &table[id]; | |
309 | if (!entry->event_func) { | |
310 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
311 | return; |
312 | } | |
3b82c4e1 MD |
313 | |
314 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 315 | action_list = &chan->priv->parent.compat_sc_table[id]; |
3b82c4e1 | 316 | } else { |
ac847066 | 317 | action_list = &chan->priv->parent.sc_table[id]; |
3b82c4e1 MD |
318 | } |
319 | if (unlikely(hlist_empty(action_list))) | |
320 | return; | |
321 | ||
e2d5dbc7 | 322 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
323 | } |
324 | ||
8a8ac9a8 FD |
325 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
326 | long id) | |
327 | { | |
328 | struct lttng_event_notifier_group *group = __data; | |
329 | const struct trace_syscall_entry *table, *entry; | |
330 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
331 | size_t table_len; | |
332 | ||
333 | if (unlikely(in_compat_syscall())) { | |
334 | struct lttng_syscall_filter *filter = group->sc_filter; | |
335 | ||
336 | if (id < 0 || id >= NR_compat_syscalls | |
337 | || (!READ_ONCE(group->syscall_all_entry) && | |
338 | !test_bit(id, filter->sc_compat_entry))) { | |
339 | /* System call filtered out. */ | |
340 | return; | |
341 | } | |
f385fc5f FD |
342 | table = compat_sc_table.table; |
343 | table_len = compat_sc_table.len; | |
8a8ac9a8 FD |
344 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; |
345 | } else { | |
346 | struct lttng_syscall_filter *filter = group->sc_filter; | |
347 | ||
348 | if (id < 0 || id >= NR_syscalls | |
349 | || (!READ_ONCE(group->syscall_all_entry) && | |
350 | !test_bit(id, filter->sc_entry))) { | |
351 | /* System call filtered out. */ | |
352 | return; | |
353 | } | |
f385fc5f FD |
354 | table = sc_table.table; |
355 | table_len = sc_table.len; | |
8a8ac9a8 FD |
356 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; |
357 | } | |
358 | /* Check if the syscall id is out of bound. */ | |
359 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 360 | syscall_entry_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
361 | regs, id); |
362 | return; | |
363 | } | |
364 | ||
365 | entry = &table[id]; | |
e2d5dbc7 MD |
366 | if (!entry->event_func) { |
367 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
368 | regs, id); |
369 | return; | |
370 | } | |
371 | ||
372 | if (unlikely(in_compat_syscall())) { | |
373 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
374 | } else { | |
375 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
376 | } | |
377 | if (unlikely(hlist_empty(dispatch_list))) | |
378 | return; | |
379 | ||
e2d5dbc7 MD |
380 | syscall_entry_event_call_func(dispatch_list, |
381 | entry->event_func, entry->nrargs, regs); | |
8a8ac9a8 FD |
382 | } |
383 | ||
3b82c4e1 | 384 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 385 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 386 | { |
1b7b9c65 | 387 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 388 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 389 | |
1b7b9c65 | 390 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 391 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 392 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 393 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
394 | args); |
395 | else | |
e2d5dbc7 | 396 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 397 | } |
5b7ac358 MD |
398 | } |
399 | ||
3b82c4e1 | 400 | static __always_inline |
e2d5dbc7 | 401 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
402 | void *func, unsigned int nrargs, |
403 | struct pt_regs *regs, long ret) | |
5b7ac358 | 404 | { |
a67ba386 | 405 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 406 | |
3b82c4e1 | 407 | switch (nrargs) { |
5b7ac358 MD |
408 | case 0: |
409 | { | |
3b82c4e1 | 410 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 411 | |
e2d5dbc7 MD |
412 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
413 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
414 | break; |
415 | } | |
416 | case 1: | |
417 | { | |
418 | void (*fptr)(void *__data, | |
fc4f7161 | 419 | long ret, |
3b82c4e1 | 420 | unsigned long arg0) = func; |
1b7b9c65 | 421 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 422 | |
1b7b9c65 | 423 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
424 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
425 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
426 | break; |
427 | } | |
428 | case 2: | |
429 | { | |
430 | void (*fptr)(void *__data, | |
fc4f7161 | 431 | long ret, |
5b7ac358 | 432 | unsigned long arg0, |
3b82c4e1 | 433 | unsigned long arg1) = func; |
1b7b9c65 | 434 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 435 | |
1b7b9c65 | 436 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
437 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
438 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
439 | break; |
440 | } | |
441 | case 3: | |
442 | { | |
443 | void (*fptr)(void *__data, | |
fc4f7161 | 444 | long ret, |
5b7ac358 MD |
445 | unsigned long arg0, |
446 | unsigned long arg1, | |
3b82c4e1 | 447 | unsigned long arg2) = func; |
1b7b9c65 | 448 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 449 | |
1b7b9c65 | 450 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
451 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
452 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
453 | break; |
454 | } | |
455 | case 4: | |
456 | { | |
457 | void (*fptr)(void *__data, | |
fc4f7161 | 458 | long ret, |
5b7ac358 MD |
459 | unsigned long arg0, |
460 | unsigned long arg1, | |
461 | unsigned long arg2, | |
3b82c4e1 | 462 | unsigned long arg3) = 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]); | |
5b7ac358 MD |
468 | break; |
469 | } | |
470 | case 5: | |
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, | |
3b82c4e1 | 478 | unsigned long arg4) = func; |
1b7b9c65 | 479 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 480 | |
1b7b9c65 | 481 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
482 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
483 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
484 | break; |
485 | } | |
486 | case 6: | |
487 | { | |
488 | void (*fptr)(void *__data, | |
fc4f7161 | 489 | long ret, |
5b7ac358 MD |
490 | unsigned long arg0, |
491 | unsigned long arg1, | |
492 | unsigned long arg2, | |
493 | unsigned long arg3, | |
494 | unsigned long arg4, | |
3b82c4e1 | 495 | unsigned long arg5) = func; |
1b7b9c65 | 496 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 497 | |
1b7b9c65 | 498 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
499 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
500 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 501 | args[3], args[4], args[5]); |
5b7ac358 MD |
502 | break; |
503 | } | |
504 | default: | |
505 | break; | |
506 | } | |
507 | } | |
508 | ||
3b82c4e1 MD |
509 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
510 | { | |
ac847066 | 511 | struct lttng_kernel_channel_buffer *chan = __data; |
3b82c4e1 MD |
512 | struct hlist_head *action_list, *unknown_action_list; |
513 | const struct trace_syscall_entry *table, *entry; | |
514 | size_t table_len; | |
515 | long id; | |
516 | ||
ae77b692 MD |
517 | #ifdef CONFIG_X86_X32_ABI |
518 | if (in_x32_syscall()) { | |
519 | /* x32 system calls are not supported. */ | |
520 | return; | |
521 | } | |
522 | #endif | |
3b82c4e1 MD |
523 | id = syscall_get_nr(current, regs); |
524 | ||
525 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 526 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
3b82c4e1 MD |
527 | |
528 | if (id < 0 || id >= NR_compat_syscalls | |
ac847066 | 529 | || (!READ_ONCE(chan->priv->parent.syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
530 | /* System call filtered out. */ |
531 | return; | |
532 | } | |
f385fc5f FD |
533 | table = compat_sc_exit_table.table; |
534 | table_len = compat_sc_exit_table.len; | |
ac847066 | 535 | unknown_action_list = &chan->priv->parent.compat_sc_exit_unknown; |
3b82c4e1 | 536 | } else { |
ac847066 | 537 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
3b82c4e1 MD |
538 | |
539 | if (id < 0 || id >= NR_syscalls | |
ac847066 | 540 | || (!READ_ONCE(chan->priv->parent.syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
541 | /* System call filtered out. */ |
542 | return; | |
543 | } | |
f385fc5f FD |
544 | table = sc_exit_table.table; |
545 | table_len = sc_exit_table.len; | |
ac847066 | 546 | unknown_action_list = &chan->priv->parent.sc_exit_unknown; |
3b82c4e1 MD |
547 | } |
548 | if (unlikely(id < 0 || id >= table_len)) { | |
549 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
550 | return; | |
551 | } | |
552 | ||
553 | entry = &table[id]; | |
554 | if (!entry->event_func) { | |
555 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
556 | return; | |
557 | } | |
558 | ||
559 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 560 | action_list = &chan->priv->parent.compat_sc_exit_table[id]; |
3b82c4e1 | 561 | } else { |
ac847066 | 562 | action_list = &chan->priv->parent.sc_exit_table[id]; |
3b82c4e1 MD |
563 | } |
564 | if (unlikely(hlist_empty(action_list))) | |
565 | return; | |
566 | ||
e2d5dbc7 | 567 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
568 | regs, ret); |
569 | } | |
570 | ||
8a8ac9a8 FD |
571 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, |
572 | long ret) | |
573 | { | |
574 | struct lttng_event_notifier_group *group = __data; | |
575 | const struct trace_syscall_entry *table, *entry; | |
576 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
577 | size_t table_len; | |
578 | long id; | |
579 | ||
580 | id = syscall_get_nr(current, regs); | |
581 | ||
582 | if (unlikely(in_compat_syscall())) { | |
583 | struct lttng_syscall_filter *filter = group->sc_filter; | |
584 | ||
585 | if (id < 0 || id >= NR_compat_syscalls | |
586 | || (!READ_ONCE(group->syscall_all_exit) && | |
587 | !test_bit(id, filter->sc_compat_exit))) { | |
588 | /* System call filtered out. */ | |
589 | return; | |
590 | } | |
f385fc5f FD |
591 | table = compat_sc_exit_table.table; |
592 | table_len = compat_sc_exit_table.len; | |
8a8ac9a8 FD |
593 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; |
594 | } else { | |
595 | struct lttng_syscall_filter *filter = group->sc_filter; | |
596 | ||
597 | if (id < 0 || id >= NR_syscalls | |
598 | || (!READ_ONCE(group->syscall_all_exit) && | |
599 | !test_bit(id, filter->sc_exit))) { | |
600 | /* System call filtered out. */ | |
601 | return; | |
602 | } | |
f385fc5f FD |
603 | table = sc_exit_table.table; |
604 | table_len = sc_exit_table.len; | |
8a8ac9a8 FD |
605 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; |
606 | } | |
607 | /* Check if the syscall id is out of bound. */ | |
608 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 609 | syscall_exit_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
610 | regs, id, ret); |
611 | return; | |
612 | } | |
613 | ||
614 | entry = &table[id]; | |
e2d5dbc7 MD |
615 | if (!entry->event_func) { |
616 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
617 | regs, id); |
618 | return; | |
619 | } | |
620 | ||
621 | if (unlikely(in_compat_syscall())) { | |
622 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
623 | } else { | |
624 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
625 | } | |
626 | if (unlikely(hlist_empty(dispatch_list))) | |
627 | return; | |
628 | ||
e2d5dbc7 MD |
629 | syscall_exit_event_call_func(dispatch_list, |
630 | entry->event_func, entry->nrargs, regs, ret); | |
8a8ac9a8 | 631 | } |
33a39a3c MD |
632 | /* |
633 | * noinline to diminish caller stack size. | |
634 | * Should be called with sessions lock held. | |
635 | */ | |
49c50022 | 636 | static |
3b82c4e1 MD |
637 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
638 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
a67ba386 | 639 | enum sc_type type) |
259b6cb3 | 640 | { |
ac847066 MD |
641 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
642 | struct lttng_kernel_session *session = chan->parent.session; | |
259b6cb3 | 643 | unsigned int i; |
49c50022 | 644 | |
3b82c4e1 | 645 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 646 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 647 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
606828e4 | 648 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
649 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
650 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
651 | struct hlist_head *head; |
652 | bool found = false; | |
49c50022 MD |
653 | |
654 | if (!desc) { | |
655 | /* Unknown syscall */ | |
656 | continue; | |
657 | } | |
3b82c4e1 MD |
658 | if (lttng_desc_match_enabler(desc, |
659 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
660 | continue; | |
49c50022 | 661 | /* |
3b82c4e1 | 662 | * Check if already created. |
49c50022 | 663 | */ |
3b82c4e1 | 664 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 665 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 666 | desc->event_name); |
a67ba386 MD |
667 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
668 | if (event_recorder_priv->parent.desc == desc | |
669 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3b82c4e1 MD |
670 | found = true; |
671 | } | |
672 | if (found) | |
49c50022 | 673 | continue; |
3b82c4e1 MD |
674 | |
675 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 676 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
677 | switch (type) { |
678 | case SC_TYPE_ENTRY: | |
606828e4 MD |
679 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
680 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
681 | break; |
682 | case SC_TYPE_EXIT: | |
606828e4 MD |
683 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
684 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
685 | break; |
686 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
687 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
688 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
689 | break; |
690 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
691 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
692 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
693 | break; |
694 | } | |
606828e4 MD |
695 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
696 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
697 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
a67ba386 MD |
698 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, ev.instrumentation); |
699 | WARN_ON_ONCE(!event_recorder); | |
700 | if (IS_ERR(event_recorder)) { | |
49c50022 MD |
701 | /* |
702 | * If something goes wrong in event registration | |
703 | * after the first one, we have no choice but to | |
704 | * leave the previous events in there, until | |
705 | * deleted by session teardown. | |
706 | */ | |
a67ba386 | 707 | return PTR_ERR(event_recorder); |
49c50022 | 708 | } |
a67ba386 | 709 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
710 | } |
711 | return 0; | |
712 | } | |
713 | ||
33a39a3c MD |
714 | /* |
715 | * Should be called with sessions lock held. | |
716 | */ | |
a67ba386 | 717 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler) |
49c50022 | 718 | { |
ac847066 | 719 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
606828e4 | 720 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
721 | int ret; |
722 | ||
263b6c88 | 723 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 | 724 | |
ac847066 | 725 | if (!chan->priv->parent.sc_table) { |
259b6cb3 | 726 | /* create syscall table mapping syscall to events */ |
ac847066 | 727 | chan->priv->parent.sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 728 | * sc_table.len, GFP_KERNEL); |
ac847066 | 729 | if (!chan->priv->parent.sc_table) |
259b6cb3 MD |
730 | return -ENOMEM; |
731 | } | |
ac847066 | 732 | if (!chan->priv->parent.sc_exit_table) { |
5b7ac358 | 733 | /* create syscall table mapping syscall to events */ |
ac847066 | 734 | chan->priv->parent.sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 735 | * sc_exit_table.len, GFP_KERNEL); |
ac847066 | 736 | if (!chan->priv->parent.sc_exit_table) |
5b7ac358 MD |
737 | return -ENOMEM; |
738 | } | |
739 | ||
259b6cb3 | 740 | |
49c50022 | 741 | #ifdef CONFIG_COMPAT |
ac847066 | 742 | if (!chan->priv->parent.compat_sc_table) { |
49c50022 | 743 | /* create syscall table mapping compat syscall to events */ |
ac847066 | 744 | chan->priv->parent.compat_sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 745 | * compat_sc_table.len, GFP_KERNEL); |
ac847066 | 746 | if (!chan->priv->parent.compat_sc_table) |
49c50022 MD |
747 | return -ENOMEM; |
748 | } | |
5b7ac358 | 749 | |
ac847066 | 750 | if (!chan->priv->parent.compat_sc_exit_table) { |
5b7ac358 | 751 | /* create syscall table mapping compat syscall to events */ |
ac847066 | 752 | chan->priv->parent.compat_sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 753 | * compat_sc_exit_table.len, GFP_KERNEL); |
ac847066 | 754 | if (!chan->priv->parent.compat_sc_exit_table) |
5b7ac358 MD |
755 | return -ENOMEM; |
756 | } | |
49c50022 | 757 | #endif |
ac847066 | 758 | if (hlist_empty(&chan->priv->parent.sc_unknown)) { |
437d5aa5 | 759 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 760 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 761 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a | 762 | |
f405cfce | 763 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
764 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
765 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
766 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
767 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
768 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 769 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 770 | ev.instrumentation); |
a67ba386 MD |
771 | WARN_ON_ONCE(!event_recorder); |
772 | if (IS_ERR(event_recorder)) { | |
773 | return PTR_ERR(event_recorder); | |
f405cfce | 774 | } |
ac847066 | 775 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_unknown); |
f405cfce MD |
776 | } |
777 | ||
ac847066 | 778 | if (hlist_empty(&chan->priv->parent.sc_compat_unknown)) { |
437d5aa5 | 779 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 780 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 781 | struct lttng_kernel_event_recorder *event_recorder; |
b76dc1a0 MD |
782 | |
783 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
784 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
785 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
786 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
787 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
788 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 789 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 790 | ev.instrumentation); |
a67ba386 MD |
791 | WARN_ON_ONCE(!event_recorder); |
792 | if (IS_ERR(event_recorder)) { | |
793 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 794 | } |
ac847066 | 795 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_compat_unknown); |
b76dc1a0 MD |
796 | } |
797 | ||
ac847066 | 798 | if (hlist_empty(&chan->priv->parent.compat_sc_exit_unknown)) { |
437d5aa5 | 799 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 800 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 801 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a MD |
802 | |
803 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
804 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
805 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
806 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
807 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
808 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
a67ba386 | 809 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 810 | ev.instrumentation); |
a67ba386 MD |
811 | WARN_ON_ONCE(!event_recorder); |
812 | if (IS_ERR(event_recorder)) { | |
813 | return PTR_ERR(event_recorder); | |
5b7ac358 | 814 | } |
ac847066 | 815 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.compat_sc_exit_unknown); |
5b7ac358 MD |
816 | } |
817 | ||
ac847066 | 818 | if (hlist_empty(&chan->priv->parent.sc_exit_unknown)) { |
437d5aa5 | 819 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 820 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 821 | struct lttng_kernel_event_recorder *event_recorder; |
5b7ac358 MD |
822 | |
823 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
824 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
825 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
826 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
827 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
828 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 829 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 830 | ev.instrumentation); |
a67ba386 MD |
831 | WARN_ON_ONCE(!event_recorder); |
832 | if (IS_ERR(event_recorder)) { | |
833 | return PTR_ERR(event_recorder); | |
2f804c0a | 834 | } |
ac847066 | 835 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_exit_unknown); |
2f804c0a MD |
836 | } |
837 | ||
f385fc5f | 838 | ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, |
ac847066 | 839 | chan->priv->parent.sc_table, event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
840 | if (ret) |
841 | return ret; | |
f385fc5f | 842 | ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, |
ac847066 | 843 | chan->priv->parent.sc_exit_table, event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
844 | if (ret) |
845 | return ret; | |
5b7ac358 | 846 | |
49c50022 | 847 | #ifdef CONFIG_COMPAT |
f385fc5f | 848 | ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, |
ac847066 | 849 | chan->priv->parent.compat_sc_table, event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
850 | if (ret) |
851 | return ret; | |
f385fc5f | 852 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, |
ac847066 | 853 | chan->priv->parent.compat_sc_exit_table, event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
854 | if (ret) |
855 | return ret; | |
856 | #endif | |
badfe9f5 | 857 | |
ac847066 MD |
858 | if (!chan->priv->parent.sc_filter) { |
859 | chan->priv->parent.sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
badfe9f5 | 860 | GFP_KERNEL); |
ac847066 | 861 | if (!chan->priv->parent.sc_filter) |
badfe9f5 MD |
862 | return -ENOMEM; |
863 | } | |
864 | ||
ac847066 | 865 | if (!chan->priv->parent.sys_enter_registered) { |
80f87dd2 | 866 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
2d6d88c6 | 867 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
868 | if (ret) |
869 | return ret; | |
ac847066 | 870 | chan->priv->parent.sys_enter_registered = 1; |
80f87dd2 | 871 | } |
63728b02 MD |
872 | /* |
873 | * We change the name of sys_exit tracepoint due to namespace | |
874 | * conflict with sys_exit syscall entry. | |
875 | */ | |
ac847066 | 876 | if (!chan->priv->parent.sys_exit_registered) { |
80f87dd2 | 877 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
2d6d88c6 | 878 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
879 | if (ret) { |
880 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 881 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
882 | return ret; |
883 | } | |
ac847066 | 884 | chan->priv->parent.sys_exit_registered = 1; |
63728b02 | 885 | } |
259b6cb3 MD |
886 | return ret; |
887 | } | |
888 | ||
889 | /* | |
8a8ac9a8 FD |
890 | * Should be called with sessions lock held. |
891 | */ | |
892 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 893 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
894 | { |
895 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
896 | unsigned int i; | |
897 | int ret = 0; | |
898 | ||
899 | wrapper_vmalloc_sync_mappings(); | |
900 | ||
901 | if (!group->event_notifier_syscall_dispatch) { | |
902 | group->event_notifier_syscall_dispatch = | |
f385fc5f | 903 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
904 | GFP_KERNEL); |
905 | if (!group->event_notifier_syscall_dispatch) | |
906 | return -ENOMEM; | |
907 | ||
908 | /* Initialize all list_head */ | |
f385fc5f | 909 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
910 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); |
911 | ||
912 | /* Init the unknown syscall notifier list. */ | |
913 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
914 | } | |
915 | ||
916 | if (!group->event_notifier_exit_syscall_dispatch) { | |
917 | group->event_notifier_exit_syscall_dispatch = | |
f385fc5f | 918 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
919 | GFP_KERNEL); |
920 | if (!group->event_notifier_exit_syscall_dispatch) | |
921 | return -ENOMEM; | |
922 | ||
923 | /* Initialize all list_head */ | |
f385fc5f | 924 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
925 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); |
926 | ||
927 | /* Init the unknown exit syscall notifier list. */ | |
928 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
929 | } | |
930 | ||
931 | #ifdef CONFIG_COMPAT | |
932 | if (!group->event_notifier_compat_syscall_dispatch) { | |
933 | group->event_notifier_compat_syscall_dispatch = | |
f385fc5f | 934 | kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, |
8a8ac9a8 FD |
935 | GFP_KERNEL); |
936 | if (!group->event_notifier_syscall_dispatch) | |
937 | return -ENOMEM; | |
938 | ||
939 | /* Initialize all list_head */ | |
f385fc5f | 940 | for (i = 0; i < compat_sc_table.len; i++) |
8a8ac9a8 FD |
941 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); |
942 | ||
943 | /* Init the unknown syscall notifier list. */ | |
944 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
945 | } | |
946 | ||
947 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
948 | group->event_notifier_exit_compat_syscall_dispatch = | |
f385fc5f | 949 | kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, |
8a8ac9a8 FD |
950 | GFP_KERNEL); |
951 | if (!group->event_notifier_exit_syscall_dispatch) | |
952 | return -ENOMEM; | |
953 | ||
954 | /* Initialize all list_head */ | |
f385fc5f | 955 | for (i = 0; i < compat_sc_exit_table.len; i++) |
8a8ac9a8 FD |
956 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); |
957 | ||
958 | /* Init the unknown exit syscall notifier list. */ | |
959 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
960 | } | |
961 | #endif | |
962 | ||
963 | if (!group->sc_filter) { | |
964 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
965 | GFP_KERNEL); | |
966 | if (!group->sc_filter) | |
967 | return -ENOMEM; | |
968 | } | |
969 | ||
970 | if (!group->sys_enter_registered) { | |
971 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
972 | (void *) syscall_entry_event_notifier_probe, group); | |
973 | if (ret) | |
974 | return ret; | |
975 | group->sys_enter_registered = 1; | |
976 | } | |
977 | ||
978 | if (!group->sys_exit_registered) { | |
979 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
980 | (void *) syscall_exit_event_notifier_probe, group); | |
981 | if (ret) { | |
982 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
983 | (void *) syscall_entry_event_notifier_probe, group)); | |
984 | return ret; | |
985 | } | |
986 | group->sys_exit_registered = 1; | |
987 | } | |
988 | ||
989 | return ret; | |
990 | } | |
991 | ||
992 | static | |
993 | int create_unknown_event_notifier( | |
994 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
995 | enum sc_type type) | |
996 | { | |
a67ba386 MD |
997 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
998 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 999 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1000 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
606828e4 | 1001 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 | 1002 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1003 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1004 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
1005 | event_notifier_enabler); | |
1006 | struct hlist_head *unknown_dispatch_list; | |
1007 | int ret = 0; | |
1008 | bool found = false; | |
606828e4 MD |
1009 | enum lttng_kernel_abi_syscall_abi abi; |
1010 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
1011 | struct hlist_head *head; |
1012 | ||
1013 | switch (type) { | |
1014 | case SC_TYPE_ENTRY: | |
1015 | desc = &__event_desc___syscall_entry_unknown; | |
1016 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
606828e4 MD |
1017 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1018 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1019 | break; |
1020 | case SC_TYPE_EXIT: | |
1021 | desc = &__event_desc___syscall_exit_unknown; | |
1022 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
606828e4 MD |
1023 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1024 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1025 | break; |
1026 | case SC_TYPE_COMPAT_ENTRY: | |
1027 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1028 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1029 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1030 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1031 | break; |
1032 | case SC_TYPE_COMPAT_EXIT: | |
1033 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1034 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1035 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1036 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1037 | break; |
1038 | default: | |
1039 | BUG_ON(1); | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * Check if already created. | |
1044 | */ | |
1045 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1046 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1047 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1048 | if (event_notifier_priv->parent.desc == desc && | |
1049 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
1050 | found = true; |
1051 | } | |
1052 | if (found) | |
1053 | goto end; | |
1054 | ||
1055 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 1056 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 1057 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 1058 | |
606828e4 | 1059 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 1060 | |
606828e4 | 1061 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
1062 | event_notifier_param.event.u.syscall.abi = abi; |
1063 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1064 | ||
a67ba386 MD |
1065 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1066 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 1067 | event_notifier_param.event.instrumentation); |
a67ba386 | 1068 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 1069 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 1070 | desc->event_name); |
8a8ac9a8 FD |
1071 | ret = -ENOMEM; |
1072 | goto end; | |
1073 | } | |
1074 | ||
a67ba386 | 1075 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
1076 | |
1077 | end: | |
1078 | return ret; | |
1079 | } | |
1080 | ||
1081 | static int create_matching_event_notifiers( | |
1082 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 1083 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
1084 | size_t table_len, enum sc_type type) |
1085 | { | |
1086 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 1087 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1088 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1089 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1090 | unsigned int i; |
1091 | int ret = 0; | |
1092 | ||
1093 | /* iterate over all syscall and create event_notifier that match */ | |
1094 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
1095 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1096 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 1097 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
1098 | struct hlist_head *head; |
1099 | int found = 0; | |
1100 | ||
1101 | desc = table[i].desc; | |
1102 | if (!desc) { | |
1103 | /* Unknown syscall */ | |
1104 | continue; | |
1105 | } | |
1106 | ||
1107 | if (!lttng_desc_match_enabler(desc, | |
1108 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1109 | continue; | |
1110 | ||
1111 | /* | |
1112 | * Check if already created. | |
1113 | */ | |
1114 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1115 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1116 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1117 | if (event_notifier_priv->parent.desc == desc | |
1118 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
8a8ac9a8 FD |
1119 | found = 1; |
1120 | } | |
1121 | if (found) | |
1122 | continue; | |
1123 | ||
1124 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1125 | switch (type) { | |
1126 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1127 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1128 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1129 | break; |
1130 | case SC_TYPE_EXIT: | |
606828e4 MD |
1131 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1132 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1133 | break; |
1134 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1135 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1136 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1137 | break; |
1138 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1139 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1140 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1141 | break; |
1142 | } | |
437d5aa5 | 1143 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1144 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1145 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1146 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1147 | |
99f52fcc FD |
1148 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1149 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1150 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1151 | if (IS_ERR(event_notifier)) { |
1152 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1153 | desc->event_name); |
8a8ac9a8 FD |
1154 | ret = -ENOMEM; |
1155 | goto end; | |
1156 | } | |
1157 | ||
a67ba386 | 1158 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1159 | } |
1160 | ||
1161 | end: | |
1162 | return ret; | |
1163 | ||
1164 | } | |
1165 | ||
a67ba386 MD |
1166 | int lttng_syscalls_create_matching_event_notifiers( |
1167 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1168 | { |
1169 | int ret; | |
1170 | struct lttng_enabler *base_enabler = | |
1171 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
606828e4 | 1172 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1173 | base_enabler->event_param.u.syscall.entryexit; |
1174 | ||
606828e4 | 1175 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1176 | ret = create_matching_event_notifiers(event_notifier_enabler, |
f385fc5f | 1177 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1178 | if (ret) |
1179 | goto end; | |
1180 | ||
1181 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
f385fc5f | 1182 | compat_sc_table.table, compat_sc_table.len, |
8a8ac9a8 FD |
1183 | SC_TYPE_COMPAT_ENTRY); |
1184 | if (ret) | |
1185 | goto end; | |
1186 | ||
1187 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1188 | SC_TYPE_ENTRY); | |
1189 | if (ret) | |
1190 | goto end; | |
1191 | ||
1192 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1193 | SC_TYPE_COMPAT_ENTRY); | |
1194 | if (ret) | |
1195 | goto end; | |
1196 | } | |
1197 | ||
606828e4 | 1198 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1199 | ret = create_matching_event_notifiers(event_notifier_enabler, |
f385fc5f | 1200 | sc_exit_table.table, sc_exit_table.len, |
8a8ac9a8 FD |
1201 | SC_TYPE_EXIT); |
1202 | if (ret) | |
1203 | goto end; | |
1204 | ||
1205 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1206 | SC_TYPE_EXIT); | |
1207 | if (ret) | |
1208 | goto end; | |
1209 | ||
1210 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
f385fc5f | 1211 | compat_sc_exit_table.table, compat_sc_exit_table.len, |
8a8ac9a8 FD |
1212 | SC_TYPE_COMPAT_EXIT); |
1213 | if (ret) | |
1214 | goto end; | |
1215 | ||
1216 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1217 | SC_TYPE_COMPAT_EXIT); | |
1218 | if (ret) | |
1219 | goto end; | |
1220 | } | |
1221 | ||
1222 | end: | |
1223 | return ret; | |
1224 | } | |
1225 | ||
1226 | /* | |
1227 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1228 | */ |
3b82c4e1 | 1229 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1230 | struct lttng_event_notifier_group *event_notifier_group) |
1231 | { | |
1232 | int ret; | |
1233 | ||
1234 | /* | |
1235 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1236 | * At the moment, we don't think it's desirable to have one fired | |
1237 | * event_notifier for the entry and one for the exit of a syscall. | |
1238 | */ | |
1239 | if (event_notifier_group->sys_enter_registered) { | |
1240 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1241 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1242 | if (ret) | |
1243 | return ret; | |
1244 | event_notifier_group->sys_enter_registered = 0; | |
1245 | } | |
1246 | if (event_notifier_group->sys_exit_registered) { | |
1247 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1248 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1249 | if (ret) | |
1250 | return ret; | |
1251 | event_notifier_group->sys_enter_registered = 0; | |
1252 | } | |
1253 | ||
1254 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1255 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1256 | #ifdef CONFIG_COMPAT | |
1257 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1258 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1259 | #endif | |
1260 | return 0; | |
1261 | } | |
1262 | ||
ac847066 | 1263 | int lttng_syscalls_unregister_channel(struct lttng_kernel_channel_buffer *chan) |
259b6cb3 MD |
1264 | { |
1265 | int ret; | |
1266 | ||
ac847066 | 1267 | if (!chan->priv->parent.sc_table) |
259b6cb3 | 1268 | return 0; |
ac847066 | 1269 | if (chan->priv->parent.sys_enter_registered) { |
2d9cd7f3 | 1270 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1271 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1272 | if (ret) |
1273 | return ret; | |
ac847066 | 1274 | chan->priv->parent.sys_enter_registered = 0; |
80f87dd2 | 1275 | } |
ac847066 | 1276 | if (chan->priv->parent.sys_exit_registered) { |
2d9cd7f3 | 1277 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1278 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1279 | if (ret) |
1280 | return ret; | |
ac847066 | 1281 | chan->priv->parent.sys_exit_registered = 0; |
80f87dd2 | 1282 | } |
badfe9f5 MD |
1283 | return 0; |
1284 | } | |
1285 | ||
ac847066 | 1286 | int lttng_syscalls_destroy_event(struct lttng_kernel_channel_buffer *chan) |
badfe9f5 | 1287 | { |
ac847066 MD |
1288 | kfree(chan->priv->parent.sc_table); |
1289 | kfree(chan->priv->parent.sc_exit_table); | |
49c50022 | 1290 | #ifdef CONFIG_COMPAT |
ac847066 MD |
1291 | kfree(chan->priv->parent.compat_sc_table); |
1292 | kfree(chan->priv->parent.compat_sc_exit_table); | |
49c50022 | 1293 | #endif |
ac847066 | 1294 | kfree(chan->priv->parent.sc_filter); |
80f87dd2 MD |
1295 | return 0; |
1296 | } | |
1297 | ||
1298 | static | |
1299 | int get_syscall_nr(const char *syscall_name) | |
1300 | { | |
1301 | int syscall_nr = -1; | |
1302 | int i; | |
1303 | ||
f385fc5f | 1304 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 1305 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1306 | const char *it_name; |
80f87dd2 | 1307 | |
f385fc5f | 1308 | entry = &sc_table.table[i]; |
80f87dd2 MD |
1309 | if (!entry->desc) |
1310 | continue; | |
437d5aa5 | 1311 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1312 | it_name += strlen(SYSCALL_ENTRY_STR); |
1313 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1314 | syscall_nr = i; |
1315 | break; | |
1316 | } | |
1317 | } | |
1318 | return syscall_nr; | |
1319 | } | |
1320 | ||
1321 | static | |
1322 | int get_compat_syscall_nr(const char *syscall_name) | |
1323 | { | |
1324 | int syscall_nr = -1; | |
1325 | int i; | |
1326 | ||
f385fc5f | 1327 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 1328 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1329 | const char *it_name; |
80f87dd2 | 1330 | |
f385fc5f | 1331 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
1332 | if (!entry->desc) |
1333 | continue; | |
437d5aa5 | 1334 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1335 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1336 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1337 | syscall_nr = i; |
1338 | break; | |
1339 | } | |
1340 | } | |
1341 | return syscall_nr; | |
1342 | } | |
1343 | ||
12e579db MD |
1344 | static |
1345 | uint32_t get_sc_tables_len(void) | |
1346 | { | |
f385fc5f | 1347 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
1348 | } |
1349 | ||
badfe9f5 | 1350 | static |
ade8a729 FD |
1351 | const char *get_syscall_name(const char *desc_name, |
1352 | enum lttng_syscall_abi abi, | |
1353 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1354 | { |
badfe9f5 | 1355 | size_t prefix_len = 0; |
80f87dd2 | 1356 | |
80f87dd2 | 1357 | |
ade8a729 | 1358 | switch (entryexit) { |
badfe9f5 | 1359 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1360 | switch (abi) { |
badfe9f5 MD |
1361 | case LTTNG_SYSCALL_ABI_NATIVE: |
1362 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1363 | break; | |
1364 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1365 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1366 | break; | |
80f87dd2 | 1367 | } |
badfe9f5 MD |
1368 | break; |
1369 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1370 | switch (abi) { |
badfe9f5 MD |
1371 | case LTTNG_SYSCALL_ABI_NATIVE: |
1372 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1373 | break; | |
1374 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1375 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1376 | break; | |
80f87dd2 | 1377 | } |
badfe9f5 | 1378 | break; |
80f87dd2 | 1379 | } |
badfe9f5 | 1380 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1381 | return desc_name + prefix_len; |
badfe9f5 MD |
1382 | } |
1383 | ||
ade8a729 FD |
1384 | static |
1385 | int lttng_syscall_filter_enable( | |
1386 | struct lttng_syscall_filter *filter, | |
1387 | const char *desc_name, enum lttng_syscall_abi abi, | |
1388 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1389 | { |
badfe9f5 MD |
1390 | const char *syscall_name; |
1391 | unsigned long *bitmap; | |
4fabf854 | 1392 | u32 *refcount_map; |
badfe9f5 MD |
1393 | int syscall_nr; |
1394 | ||
ade8a729 | 1395 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1396 | |
ade8a729 | 1397 | switch (abi) { |
badfe9f5 MD |
1398 | case LTTNG_SYSCALL_ABI_NATIVE: |
1399 | syscall_nr = get_syscall_nr(syscall_name); | |
1400 | break; | |
1401 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1402 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1403 | break; | |
1404 | default: | |
1405 | return -EINVAL; | |
80f87dd2 | 1406 | } |
badfe9f5 MD |
1407 | if (syscall_nr < 0) |
1408 | return -ENOENT; | |
1409 | ||
ade8a729 | 1410 | switch (entryexit) { |
badfe9f5 | 1411 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1412 | switch (abi) { |
badfe9f5 MD |
1413 | case LTTNG_SYSCALL_ABI_NATIVE: |
1414 | bitmap = filter->sc_entry; | |
4fabf854 | 1415 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1416 | break; |
1417 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1418 | bitmap = filter->sc_compat_entry; | |
4fabf854 | 1419 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1420 | break; |
6d9694d8 MD |
1421 | default: |
1422 | return -EINVAL; | |
80f87dd2 | 1423 | } |
badfe9f5 MD |
1424 | break; |
1425 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1426 | switch (abi) { |
badfe9f5 MD |
1427 | case LTTNG_SYSCALL_ABI_NATIVE: |
1428 | bitmap = filter->sc_exit; | |
4fabf854 | 1429 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1430 | break; |
1431 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1432 | bitmap = filter->sc_compat_exit; | |
4fabf854 | 1433 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1434 | break; |
6d9694d8 MD |
1435 | default: |
1436 | return -EINVAL; | |
80f87dd2 | 1437 | } |
badfe9f5 MD |
1438 | break; |
1439 | default: | |
1440 | return -EINVAL; | |
80f87dd2 | 1441 | } |
4fabf854 MD |
1442 | if (refcount_map[syscall_nr] == U32_MAX) |
1443 | return -EOVERFLOW; | |
1444 | if (refcount_map[syscall_nr]++ == 0) | |
1445 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1446 | return 0; |
80f87dd2 MD |
1447 | } |
1448 | ||
8a8ac9a8 | 1449 | int lttng_syscall_filter_enable_event_notifier( |
a67ba386 | 1450 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1451 | { |
a67ba386 MD |
1452 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
1453 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; | |
8a8ac9a8 FD |
1454 | struct hlist_head *dispatch_list; |
1455 | int ret = 0; | |
1456 | ||
a67ba386 | 1457 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1458 | |
4fabf854 MD |
1459 | /* Skip unknown syscall */ |
1460 | if (syscall_id == -1U) | |
1461 | return 0; | |
1462 | ||
8a8ac9a8 | 1463 | ret = lttng_syscall_filter_enable(group->sc_filter, |
a67ba386 MD |
1464 | event_notifier->priv->parent.desc->event_name, |
1465 | event_notifier->priv->parent.u.syscall.abi, | |
1466 | event_notifier->priv->parent.u.syscall.entryexit); | |
4fabf854 MD |
1467 | if (ret) |
1468 | return ret; | |
8a8ac9a8 | 1469 | |
a67ba386 | 1470 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 1471 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 1472 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1473 | case LTTNG_SYSCALL_ABI_NATIVE: |
1474 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1475 | break; | |
1476 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1477 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1478 | break; | |
6866b1c7 MJ |
1479 | default: |
1480 | ret = -EINVAL; | |
1481 | goto end; | |
8a8ac9a8 FD |
1482 | } |
1483 | break; | |
1484 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 1485 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1486 | case LTTNG_SYSCALL_ABI_NATIVE: |
1487 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1488 | break; | |
1489 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1490 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1491 | break; | |
6866b1c7 MJ |
1492 | default: |
1493 | ret = -EINVAL; | |
1494 | goto end; | |
8a8ac9a8 FD |
1495 | } |
1496 | break; | |
6866b1c7 MJ |
1497 | default: |
1498 | ret = -EINVAL; | |
1499 | goto end; | |
8a8ac9a8 FD |
1500 | } |
1501 | ||
a67ba386 | 1502 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
1503 | |
1504 | end: | |
4fabf854 | 1505 | return ret; |
8a8ac9a8 FD |
1506 | } |
1507 | ||
ade8a729 | 1508 | int lttng_syscall_filter_enable_event( |
ac847066 | 1509 | struct lttng_kernel_channel_buffer *channel, |
a67ba386 | 1510 | struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 1511 | { |
4fabf854 MD |
1512 | unsigned int syscall_id = event_recorder->priv->parent.u.syscall.syscall_id; |
1513 | ||
a67ba386 | 1514 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 | 1515 | |
4fabf854 MD |
1516 | /* Skip unknown syscall */ |
1517 | if (syscall_id == -1U) | |
1518 | return 0; | |
1519 | ||
ac847066 | 1520 | return lttng_syscall_filter_enable(channel->priv->parent.sc_filter, |
a67ba386 MD |
1521 | event_recorder->priv->parent.desc->event_name, |
1522 | event_recorder->priv->parent.u.syscall.abi, | |
1523 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1524 | } |
1525 | ||
1526 | static | |
1527 | int lttng_syscall_filter_disable( | |
1528 | struct lttng_syscall_filter *filter, | |
1529 | const char *desc_name, enum lttng_syscall_abi abi, | |
1530 | enum lttng_syscall_entryexit entryexit) | |
1531 | { | |
badfe9f5 MD |
1532 | const char *syscall_name; |
1533 | unsigned long *bitmap; | |
4fabf854 | 1534 | u32 *refcount_map; |
badfe9f5 | 1535 | int syscall_nr; |
80f87dd2 | 1536 | |
ade8a729 | 1537 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1538 | |
ade8a729 | 1539 | switch (abi) { |
badfe9f5 MD |
1540 | case LTTNG_SYSCALL_ABI_NATIVE: |
1541 | syscall_nr = get_syscall_nr(syscall_name); | |
1542 | break; | |
1543 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1544 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1545 | break; | |
1546 | default: | |
1547 | return -EINVAL; | |
80f87dd2 | 1548 | } |
badfe9f5 MD |
1549 | if (syscall_nr < 0) |
1550 | return -ENOENT; | |
80f87dd2 | 1551 | |
ade8a729 | 1552 | switch (entryexit) { |
badfe9f5 | 1553 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1554 | switch (abi) { |
badfe9f5 MD |
1555 | case LTTNG_SYSCALL_ABI_NATIVE: |
1556 | bitmap = filter->sc_entry; | |
4fabf854 | 1557 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1558 | break; |
1559 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1560 | bitmap = filter->sc_compat_entry; | |
4fabf854 | 1561 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1562 | break; |
6d9694d8 MD |
1563 | default: |
1564 | return -EINVAL; | |
80f87dd2 | 1565 | } |
badfe9f5 MD |
1566 | break; |
1567 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1568 | switch (abi) { |
badfe9f5 MD |
1569 | case LTTNG_SYSCALL_ABI_NATIVE: |
1570 | bitmap = filter->sc_exit; | |
4fabf854 | 1571 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1572 | break; |
1573 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1574 | bitmap = filter->sc_compat_exit; | |
4fabf854 | 1575 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1576 | break; |
6d9694d8 MD |
1577 | default: |
1578 | return -EINVAL; | |
80f87dd2 | 1579 | } |
badfe9f5 MD |
1580 | break; |
1581 | default: | |
1582 | return -EINVAL; | |
80f87dd2 | 1583 | } |
4fabf854 MD |
1584 | if (refcount_map[syscall_nr] == 0) |
1585 | return -ENOENT; | |
1586 | if (--refcount_map[syscall_nr] == 0) | |
1587 | bitmap_clear(bitmap, syscall_nr, 1); | |
badfe9f5 | 1588 | return 0; |
259b6cb3 | 1589 | } |
2d2464bd | 1590 | |
8a8ac9a8 | 1591 | int lttng_syscall_filter_disable_event_notifier( |
a67ba386 | 1592 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1593 | { |
a67ba386 | 1594 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
4fabf854 | 1595 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; |
8a8ac9a8 FD |
1596 | int ret; |
1597 | ||
a67ba386 | 1598 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1599 | |
4fabf854 MD |
1600 | /* Skip unknown syscall */ |
1601 | if (syscall_id == -1U) | |
1602 | return 0; | |
1603 | ||
8a8ac9a8 | 1604 | ret = lttng_syscall_filter_disable(group->sc_filter, |
a67ba386 MD |
1605 | event_notifier->priv->parent.desc->event_name, |
1606 | event_notifier->priv->parent.u.syscall.abi, | |
1607 | event_notifier->priv->parent.u.syscall.entryexit); | |
4fabf854 MD |
1608 | if (ret) |
1609 | return ret; | |
8a8ac9a8 | 1610 | |
a67ba386 | 1611 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
1612 | return 0; |
1613 | } | |
1614 | ||
ade8a729 | 1615 | int lttng_syscall_filter_disable_event( |
ac847066 | 1616 | struct lttng_kernel_channel_buffer *channel, |
a67ba386 | 1617 | struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 | 1618 | { |
4fabf854 MD |
1619 | unsigned int syscall_id = event_recorder->priv->parent.u.syscall.syscall_id; |
1620 | ||
1621 | /* Skip unknown syscall */ | |
1622 | if (syscall_id == -1U) | |
1623 | return 0; | |
1624 | ||
ac847066 | 1625 | return lttng_syscall_filter_disable(channel->priv->parent.sc_filter, |
a67ba386 MD |
1626 | event_recorder->priv->parent.desc->event_name, |
1627 | event_recorder->priv->parent.u.syscall.abi, | |
1628 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1629 | } |
1630 | ||
2d2464bd MD |
1631 | static |
1632 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1633 | { | |
1634 | const struct trace_syscall_entry *entry; | |
1635 | int iter = 0; | |
1636 | ||
f385fc5f FD |
1637 | for (entry = sc_table.table; |
1638 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1639 | entry++) { |
1640 | if (iter++ >= *pos) | |
1641 | return entry; | |
1642 | } | |
f385fc5f FD |
1643 | for (entry = compat_sc_table.table; |
1644 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1645 | entry++) { |
1646 | if (iter++ >= *pos) | |
1647 | return entry; | |
1648 | } | |
1649 | /* End of list */ | |
1650 | return NULL; | |
1651 | } | |
1652 | ||
1653 | static | |
1654 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1655 | { | |
1656 | return (void *) syscall_list_get_entry(pos); | |
1657 | } | |
1658 | ||
1659 | static | |
1660 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1661 | { | |
1662 | (*ppos)++; | |
1663 | return (void *) syscall_list_get_entry(ppos); | |
1664 | } | |
1665 | ||
1666 | static | |
1667 | void syscall_list_stop(struct seq_file *m, void *p) | |
1668 | { | |
1669 | } | |
1670 | ||
12e579db MD |
1671 | static |
1672 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1673 | const struct trace_syscall_entry **table, | |
1674 | unsigned int *bitness) | |
1675 | { | |
f385fc5f | 1676 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1677 | if (bitness) |
1678 | *bitness = BITS_PER_LONG; | |
1679 | if (table) | |
f385fc5f | 1680 | *table = sc_table.table; |
12e579db MD |
1681 | return 0; |
1682 | } | |
f385fc5f FD |
1683 | if (!(entry >= compat_sc_table.table |
1684 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1685 | return -EINVAL; |
1686 | } | |
1687 | if (bitness) | |
1688 | *bitness = 32; | |
1689 | if (table) | |
f385fc5f | 1690 | *table = compat_sc_table.table; |
12e579db MD |
1691 | return 0; |
1692 | } | |
1693 | ||
2d2464bd MD |
1694 | static |
1695 | int syscall_list_show(struct seq_file *m, void *p) | |
1696 | { | |
1697 | const struct trace_syscall_entry *table, *entry = p; | |
1698 | unsigned int bitness; | |
d4291869 | 1699 | unsigned long index; |
12e579db | 1700 | int ret; |
d4291869 | 1701 | const char *name; |
2d2464bd | 1702 | |
12e579db MD |
1703 | ret = get_sc_table(entry, &table, &bitness); |
1704 | if (ret) | |
1705 | return ret; | |
f4855b46 MD |
1706 | if (!entry->desc) |
1707 | return 0; | |
f385fc5f | 1708 | if (table == sc_table.table) { |
d4291869 | 1709 | index = entry - table; |
437d5aa5 | 1710 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1711 | } else { |
f385fc5f | 1712 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1713 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1714 | } |
12e579db | 1715 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1716 | index, name, bitness); |
2d2464bd MD |
1717 | return 0; |
1718 | } | |
1719 | ||
1720 | static | |
1721 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1722 | .start = syscall_list_start, | |
1723 | .next = syscall_list_next, | |
1724 | .stop = syscall_list_stop, | |
1725 | .show = syscall_list_show, | |
1726 | }; | |
1727 | ||
1728 | static | |
1729 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1730 | { | |
1731 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1732 | } | |
1733 | ||
1734 | const struct file_operations lttng_syscall_list_fops = { | |
1735 | .owner = THIS_MODULE, | |
1736 | .open = lttng_syscall_list_open, | |
1737 | .read = seq_read, | |
1738 | .llseek = seq_lseek, | |
1739 | .release = seq_release, | |
1740 | }; | |
12e579db | 1741 | |
badfe9f5 MD |
1742 | /* |
1743 | * A syscall is enabled if it is traced for either entry or exit. | |
1744 | */ | |
ac847066 | 1745 | long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer *channel, |
606828e4 | 1746 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1747 | { |
1748 | uint32_t len, sc_tables_len, bitmask_len; | |
1749 | int ret = 0, bit; | |
1750 | char *tmp_mask; | |
1751 | struct lttng_syscall_filter *filter; | |
1752 | ||
1753 | ret = get_user(len, &usyscall_mask->len); | |
1754 | if (ret) | |
1755 | return ret; | |
1756 | sc_tables_len = get_sc_tables_len(); | |
1757 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1758 | if (len < sc_tables_len) { | |
1759 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1760 | } | |
1761 | /* Array is large enough, we can copy array to user-space. */ | |
1762 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1763 | if (!tmp_mask) | |
1764 | return -ENOMEM; | |
ac847066 | 1765 | filter = channel->priv->parent.sc_filter; |
12e579db | 1766 | |
f385fc5f | 1767 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1768 | char state; |
2f25059d | 1769 | |
ac847066 MD |
1770 | if (channel->priv->parent.sc_table) { |
1771 | if (!(READ_ONCE(channel->priv->parent.syscall_all_entry) | |
1772 | || READ_ONCE(channel->priv->parent.syscall_all_exit)) && filter) | |
badfe9f5 MD |
1773 | state = test_bit(bit, filter->sc_entry) |
1774 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1775 | else |
1776 | state = 1; | |
1777 | } else { | |
1778 | state = 0; | |
1779 | } | |
1780 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1781 | } |
1782 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1783 | char state; |
2f25059d | 1784 | |
ac847066 MD |
1785 | if (channel->priv->parent.compat_sc_table) { |
1786 | if (!(READ_ONCE(channel->priv->parent.syscall_all_entry) | |
1787 | || READ_ONCE(channel->priv->parent.syscall_all_exit)) && filter) | |
f385fc5f | 1788 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1789 | filter->sc_compat_entry) |
f385fc5f | 1790 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1791 | filter->sc_compat_exit); |
2f25059d MD |
1792 | else |
1793 | state = 1; | |
1794 | } else { | |
1795 | state = 0; | |
1796 | } | |
1797 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1798 | } |
1799 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1800 | ret = -EFAULT; | |
1801 | kfree(tmp_mask); | |
1802 | return ret; | |
1803 | } | |
082d4946 MD |
1804 | |
1805 | int lttng_abi_syscall_list(void) | |
1806 | { | |
1807 | struct file *syscall_list_file; | |
1808 | int file_fd, ret; | |
1809 | ||
4ac10b76 | 1810 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1811 | if (file_fd < 0) { |
1812 | ret = file_fd; | |
1813 | goto fd_error; | |
1814 | } | |
1815 | ||
1816 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1817 | <tng_syscall_list_fops, | |
1818 | NULL, O_RDWR); | |
1819 | if (IS_ERR(syscall_list_file)) { | |
1820 | ret = PTR_ERR(syscall_list_file); | |
1821 | goto file_error; | |
1822 | } | |
1823 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1824 | if (ret < 0) | |
1825 | goto open_error; | |
1826 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1827 | return file_fd; |
1828 | ||
1829 | open_error: | |
1830 | fput(syscall_list_file); | |
1831 | file_error: | |
1832 | put_unused_fd(file_fd); | |
1833 | fd_error: | |
1834 | return ret; | |
1835 | } |