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> |
0886cfd7 | 35 | #include <lttng/kernel-version.h> |
259b6cb3 | 36 | |
f385fc5f FD |
37 | #include "lttng-syscalls.h" |
38 | ||
6333ace3 | 39 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
40 | # ifndef is_compat_task |
41 | # define is_compat_task() (0) | |
42 | # endif | |
6333ace3 MD |
43 | #endif |
44 | ||
1aa3298b MD |
45 | /* in_compat_syscall appears in kernel 4.6. */ |
46 | #ifndef in_compat_syscall | |
0886cfd7 MD |
47 | # define in_compat_syscall() is_compat_task() |
48 | #endif | |
49 | ||
50 | /* in_x32_syscall appears in kernel 4.7. */ | |
51 | #if (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(4,7,0)) | |
52 | # ifdef CONFIG_X86_X32_ABI | |
53 | # define in_x32_syscall() is_x32_task() | |
54 | # endif | |
1aa3298b MD |
55 | #endif |
56 | ||
5b7ac358 MD |
57 | enum sc_type { |
58 | SC_TYPE_ENTRY, | |
59 | SC_TYPE_EXIT, | |
60 | SC_TYPE_COMPAT_ENTRY, | |
61 | SC_TYPE_COMPAT_EXIT, | |
62 | }; | |
63 | ||
d4291869 MD |
64 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
65 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
66 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
67 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
68 | ||
69 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
70 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
71 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
72 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 73 | |
2d6d88c6 | 74 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
2d6d88c6 | 75 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 76 | |
8a8ac9a8 FD |
77 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
78 | long id); | |
8a8ac9a8 FD |
79 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, |
80 | long ret); | |
81 | ||
3a523f5b MD |
82 | /* |
83 | * Forward declarations for old kernels. | |
84 | */ | |
85 | struct mmsghdr; | |
86 | struct rlimit64; | |
87 | struct oldold_utsname; | |
88 | struct old_utsname; | |
89 | struct sel_arg_struct; | |
90 | struct mmap_arg_struct; | |
c0b71117 | 91 | struct file_handle; |
a292e6f1 | 92 | struct user_msghdr; |
3a523f5b | 93 | |
9eb15e8b MJ |
94 | /* |
95 | * Forward declaration for kernels >= 5.6 | |
96 | */ | |
97 | struct timex; | |
edfdcb68 MJ |
98 | struct timeval; |
99 | struct itimerval; | |
100 | struct itimerspec; | |
101 | ||
5f4c791e | 102 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
103 | typedef __kernel_old_time_t time_t; |
104 | #endif | |
9eb15e8b | 105 | |
80f87dd2 MD |
106 | #ifdef IA32_NR_syscalls |
107 | #define NR_compat_syscalls IA32_NR_syscalls | |
108 | #else | |
109 | #define NR_compat_syscalls NR_syscalls | |
110 | #endif | |
111 | ||
259b6cb3 MD |
112 | /* |
113 | * Create LTTng tracepoint probes. | |
114 | */ | |
115 | #define LTTNG_PACKAGE_BUILD | |
116 | #define CREATE_TRACE_POINTS | |
2655f9ad | 117 | #define TP_MODULE_NOINIT |
c075712b | 118 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 119 | |
a93244f8 MD |
120 | #define PARAMS(args...) args |
121 | ||
5b7ac358 | 122 | /* Handle unknown syscalls */ |
72a52753 | 123 | #undef TRACE_SYSTEM |
5b7ac358 | 124 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 125 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
126 | #undef TRACE_SYSTEM |
127 | ||
5b7ac358 | 128 | #undef TP_PROBE_CB |
fc4f7161 | 129 | |
5bcf4dbd FD |
130 | extern const struct trace_syscall_table sc_table; |
131 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 132 | |
2d6d88c6 | 133 | /* Event syscall exit table */ |
5bcf4dbd FD |
134 | extern const struct trace_syscall_table sc_exit_table; |
135 | extern const struct trace_syscall_table compat_sc_exit_table; | |
f385fc5f FD |
136 | |
137 | ||
fc4f7161 MD |
138 | #undef SC_EXIT |
139 | ||
a93244f8 | 140 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 141 | |
80f87dd2 | 142 | struct lttng_syscall_filter { |
badfe9f5 MD |
143 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
144 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
145 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
146 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
4fabf854 MD |
147 | |
148 | /* | |
149 | * Reference counters keeping track of number of events enabled | |
150 | * for each bit. | |
151 | */ | |
152 | u32 sc_entry_refcount_map[NR_syscalls]; | |
153 | u32 sc_exit_refcount_map[NR_syscalls]; | |
154 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
155 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
156 | }; |
157 | ||
3b82c4e1 | 158 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 159 | struct pt_regs *regs, long id) |
f405cfce | 160 | { |
1b7b9c65 | 161 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 162 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 163 | |
1b7b9c65 | 164 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 165 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 166 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 167 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 168 | else |
e2d5dbc7 | 169 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
170 | } |
171 | } | |
172 | ||
63aa9160 | 173 | static __always_inline |
e2d5dbc7 | 174 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 175 | void *func, unsigned int nrargs, |
63aa9160 | 176 | struct pt_regs *regs) |
259b6cb3 | 177 | { |
a67ba386 | 178 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 179 | |
63aa9160 | 180 | switch (nrargs) { |
259b6cb3 MD |
181 | case 0: |
182 | { | |
63aa9160 | 183 | void (*fptr)(void *__data) = func; |
259b6cb3 | 184 | |
e2d5dbc7 MD |
185 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
186 | fptr(event_priv->pub); | |
259b6cb3 MD |
187 | break; |
188 | } | |
189 | case 1: | |
190 | { | |
63aa9160 | 191 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 192 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 193 | |
1b7b9c65 | 194 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
195 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
196 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
197 | break; |
198 | } | |
199 | case 2: | |
200 | { | |
201 | void (*fptr)(void *__data, | |
202 | unsigned long arg0, | |
63aa9160 | 203 | unsigned long arg1) = func; |
1b7b9c65 | 204 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 205 | |
1b7b9c65 | 206 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
207 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
208 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
209 | break; |
210 | } | |
211 | case 3: | |
212 | { | |
213 | void (*fptr)(void *__data, | |
214 | unsigned long arg0, | |
215 | unsigned long arg1, | |
63aa9160 | 216 | unsigned long arg2) = func; |
1b7b9c65 | 217 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 218 | |
1b7b9c65 | 219 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
220 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
221 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
222 | break; |
223 | } | |
224 | case 4: | |
225 | { | |
226 | void (*fptr)(void *__data, | |
227 | unsigned long arg0, | |
228 | unsigned long arg1, | |
229 | unsigned long arg2, | |
63aa9160 | 230 | unsigned long arg3) = func; |
1b7b9c65 | 231 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 232 | |
1b7b9c65 | 233 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
234 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
235 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
236 | break; |
237 | } | |
238 | case 5: | |
239 | { | |
240 | void (*fptr)(void *__data, | |
241 | unsigned long arg0, | |
242 | unsigned long arg1, | |
243 | unsigned long arg2, | |
244 | unsigned long arg3, | |
63aa9160 | 245 | unsigned long arg4) = func; |
1b7b9c65 | 246 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 247 | |
1b7b9c65 | 248 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
249 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
250 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
251 | break; |
252 | } | |
253 | case 6: | |
254 | { | |
255 | void (*fptr)(void *__data, | |
256 | unsigned long arg0, | |
257 | unsigned long arg1, | |
258 | unsigned long arg2, | |
259 | unsigned long arg3, | |
260 | unsigned long arg4, | |
63aa9160 | 261 | unsigned long arg5) = func; |
1b7b9c65 | 262 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 263 | |
1b7b9c65 | 264 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
265 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
266 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 267 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
268 | break; |
269 | } | |
270 | default: | |
271 | break; | |
272 | } | |
273 | } | |
274 | ||
63aa9160 FD |
275 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
276 | { | |
ac847066 | 277 | struct lttng_kernel_channel_buffer *chan = __data; |
3b82c4e1 | 278 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
279 | const struct trace_syscall_entry *table, *entry; |
280 | size_t table_len; | |
281 | ||
ae77b692 MD |
282 | #ifdef CONFIG_X86_X32_ABI |
283 | if (in_x32_syscall()) { | |
284 | /* x32 system calls are not supported. */ | |
285 | return; | |
286 | } | |
287 | #endif | |
63aa9160 | 288 | if (unlikely(in_compat_syscall())) { |
ac847066 | 289 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
63aa9160 FD |
290 | |
291 | if (id < 0 || id >= NR_compat_syscalls | |
ac847066 | 292 | || (!READ_ONCE(chan->priv->parent.syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
293 | /* System call filtered out. */ |
294 | return; | |
295 | } | |
f385fc5f FD |
296 | table = compat_sc_table.table; |
297 | table_len = compat_sc_table.len; | |
ac847066 | 298 | unknown_action_list = &chan->priv->parent.sc_compat_unknown; |
63aa9160 | 299 | } else { |
ac847066 | 300 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
63aa9160 FD |
301 | |
302 | if (id < 0 || id >= NR_syscalls | |
ac847066 | 303 | || (!READ_ONCE(chan->priv->parent.syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
304 | /* System call filtered out. */ |
305 | return; | |
306 | } | |
f385fc5f FD |
307 | table = sc_table.table; |
308 | table_len = sc_table.len; | |
ac847066 | 309 | unknown_action_list = &chan->priv->parent.sc_unknown; |
63aa9160 FD |
310 | } |
311 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 312 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
313 | return; |
314 | } | |
3b82c4e1 MD |
315 | |
316 | entry = &table[id]; | |
317 | if (!entry->event_func) { | |
318 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
319 | return; |
320 | } | |
3b82c4e1 MD |
321 | |
322 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 323 | action_list = &chan->priv->parent.compat_sc_table[id]; |
3b82c4e1 | 324 | } else { |
ac847066 | 325 | action_list = &chan->priv->parent.sc_table[id]; |
3b82c4e1 MD |
326 | } |
327 | if (unlikely(hlist_empty(action_list))) | |
328 | return; | |
329 | ||
e2d5dbc7 | 330 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
331 | } |
332 | ||
8a8ac9a8 FD |
333 | void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, |
334 | long id) | |
335 | { | |
336 | struct lttng_event_notifier_group *group = __data; | |
337 | const struct trace_syscall_entry *table, *entry; | |
338 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
339 | size_t table_len; | |
340 | ||
341 | if (unlikely(in_compat_syscall())) { | |
342 | struct lttng_syscall_filter *filter = group->sc_filter; | |
343 | ||
344 | if (id < 0 || id >= NR_compat_syscalls | |
345 | || (!READ_ONCE(group->syscall_all_entry) && | |
346 | !test_bit(id, filter->sc_compat_entry))) { | |
347 | /* System call filtered out. */ | |
348 | return; | |
349 | } | |
f385fc5f FD |
350 | table = compat_sc_table.table; |
351 | table_len = compat_sc_table.len; | |
8a8ac9a8 FD |
352 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; |
353 | } else { | |
354 | struct lttng_syscall_filter *filter = group->sc_filter; | |
355 | ||
356 | if (id < 0 || id >= NR_syscalls | |
357 | || (!READ_ONCE(group->syscall_all_entry) && | |
358 | !test_bit(id, filter->sc_entry))) { | |
359 | /* System call filtered out. */ | |
360 | return; | |
361 | } | |
f385fc5f FD |
362 | table = sc_table.table; |
363 | table_len = sc_table.len; | |
8a8ac9a8 FD |
364 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; |
365 | } | |
366 | /* Check if the syscall id is out of bound. */ | |
367 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 368 | syscall_entry_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
369 | regs, id); |
370 | return; | |
371 | } | |
372 | ||
373 | entry = &table[id]; | |
e2d5dbc7 MD |
374 | if (!entry->event_func) { |
375 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
376 | regs, id); |
377 | return; | |
378 | } | |
379 | ||
380 | if (unlikely(in_compat_syscall())) { | |
381 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[id]; | |
382 | } else { | |
383 | dispatch_list = &group->event_notifier_syscall_dispatch[id]; | |
384 | } | |
385 | if (unlikely(hlist_empty(dispatch_list))) | |
386 | return; | |
387 | ||
e2d5dbc7 MD |
388 | syscall_entry_event_call_func(dispatch_list, |
389 | entry->event_func, entry->nrargs, regs); | |
8a8ac9a8 FD |
390 | } |
391 | ||
3b82c4e1 | 392 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 393 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 394 | { |
1b7b9c65 | 395 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 396 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 397 | |
1b7b9c65 | 398 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 399 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 400 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 401 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
402 | args); |
403 | else | |
e2d5dbc7 | 404 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 405 | } |
5b7ac358 MD |
406 | } |
407 | ||
3b82c4e1 | 408 | static __always_inline |
e2d5dbc7 | 409 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
410 | void *func, unsigned int nrargs, |
411 | struct pt_regs *regs, long ret) | |
5b7ac358 | 412 | { |
a67ba386 | 413 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 414 | |
3b82c4e1 | 415 | switch (nrargs) { |
5b7ac358 MD |
416 | case 0: |
417 | { | |
3b82c4e1 | 418 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 419 | |
e2d5dbc7 MD |
420 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
421 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
422 | break; |
423 | } | |
424 | case 1: | |
425 | { | |
426 | void (*fptr)(void *__data, | |
fc4f7161 | 427 | long ret, |
3b82c4e1 | 428 | unsigned long arg0) = func; |
1b7b9c65 | 429 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 430 | |
1b7b9c65 | 431 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
432 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
433 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
434 | break; |
435 | } | |
436 | case 2: | |
437 | { | |
438 | void (*fptr)(void *__data, | |
fc4f7161 | 439 | long ret, |
5b7ac358 | 440 | unsigned long arg0, |
3b82c4e1 | 441 | unsigned long arg1) = 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]); | |
5b7ac358 MD |
447 | break; |
448 | } | |
449 | case 3: | |
450 | { | |
451 | void (*fptr)(void *__data, | |
fc4f7161 | 452 | long ret, |
5b7ac358 MD |
453 | unsigned long arg0, |
454 | unsigned long arg1, | |
3b82c4e1 | 455 | unsigned long arg2) = func; |
1b7b9c65 | 456 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 457 | |
1b7b9c65 | 458 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
459 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
460 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
461 | break; |
462 | } | |
463 | case 4: | |
464 | { | |
465 | void (*fptr)(void *__data, | |
fc4f7161 | 466 | long ret, |
5b7ac358 MD |
467 | unsigned long arg0, |
468 | unsigned long arg1, | |
469 | unsigned long arg2, | |
3b82c4e1 | 470 | unsigned long arg3) = func; |
1b7b9c65 | 471 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 472 | |
1b7b9c65 | 473 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
474 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
475 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
476 | break; |
477 | } | |
478 | case 5: | |
479 | { | |
480 | void (*fptr)(void *__data, | |
fc4f7161 | 481 | long ret, |
5b7ac358 MD |
482 | unsigned long arg0, |
483 | unsigned long arg1, | |
484 | unsigned long arg2, | |
485 | unsigned long arg3, | |
3b82c4e1 | 486 | unsigned long arg4) = func; |
1b7b9c65 | 487 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 488 | |
1b7b9c65 | 489 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
490 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
491 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
492 | break; |
493 | } | |
494 | case 6: | |
495 | { | |
496 | void (*fptr)(void *__data, | |
fc4f7161 | 497 | long ret, |
5b7ac358 MD |
498 | unsigned long arg0, |
499 | unsigned long arg1, | |
500 | unsigned long arg2, | |
501 | unsigned long arg3, | |
502 | unsigned long arg4, | |
3b82c4e1 | 503 | unsigned long arg5) = func; |
1b7b9c65 | 504 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 505 | |
1b7b9c65 | 506 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
507 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
508 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 509 | args[3], args[4], args[5]); |
5b7ac358 MD |
510 | break; |
511 | } | |
512 | default: | |
513 | break; | |
514 | } | |
515 | } | |
516 | ||
3b82c4e1 MD |
517 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
518 | { | |
ac847066 | 519 | struct lttng_kernel_channel_buffer *chan = __data; |
3b82c4e1 MD |
520 | struct hlist_head *action_list, *unknown_action_list; |
521 | const struct trace_syscall_entry *table, *entry; | |
522 | size_t table_len; | |
523 | long id; | |
524 | ||
ae77b692 MD |
525 | #ifdef CONFIG_X86_X32_ABI |
526 | if (in_x32_syscall()) { | |
527 | /* x32 system calls are not supported. */ | |
528 | return; | |
529 | } | |
530 | #endif | |
3b82c4e1 MD |
531 | id = syscall_get_nr(current, regs); |
532 | ||
533 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 534 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
3b82c4e1 MD |
535 | |
536 | if (id < 0 || id >= NR_compat_syscalls | |
ac847066 | 537 | || (!READ_ONCE(chan->priv->parent.syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
538 | /* System call filtered out. */ |
539 | return; | |
540 | } | |
f385fc5f FD |
541 | table = compat_sc_exit_table.table; |
542 | table_len = compat_sc_exit_table.len; | |
ac847066 | 543 | unknown_action_list = &chan->priv->parent.compat_sc_exit_unknown; |
3b82c4e1 | 544 | } else { |
ac847066 | 545 | struct lttng_syscall_filter *filter = chan->priv->parent.sc_filter; |
3b82c4e1 MD |
546 | |
547 | if (id < 0 || id >= NR_syscalls | |
ac847066 | 548 | || (!READ_ONCE(chan->priv->parent.syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
549 | /* System call filtered out. */ |
550 | return; | |
551 | } | |
f385fc5f FD |
552 | table = sc_exit_table.table; |
553 | table_len = sc_exit_table.len; | |
ac847066 | 554 | unknown_action_list = &chan->priv->parent.sc_exit_unknown; |
3b82c4e1 MD |
555 | } |
556 | if (unlikely(id < 0 || id >= table_len)) { | |
557 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
558 | return; | |
559 | } | |
560 | ||
561 | entry = &table[id]; | |
562 | if (!entry->event_func) { | |
563 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
564 | return; | |
565 | } | |
566 | ||
567 | if (unlikely(in_compat_syscall())) { | |
ac847066 | 568 | action_list = &chan->priv->parent.compat_sc_exit_table[id]; |
3b82c4e1 | 569 | } else { |
ac847066 | 570 | action_list = &chan->priv->parent.sc_exit_table[id]; |
3b82c4e1 MD |
571 | } |
572 | if (unlikely(hlist_empty(action_list))) | |
573 | return; | |
574 | ||
e2d5dbc7 | 575 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
576 | regs, ret); |
577 | } | |
578 | ||
8a8ac9a8 FD |
579 | void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs, |
580 | long ret) | |
581 | { | |
582 | struct lttng_event_notifier_group *group = __data; | |
583 | const struct trace_syscall_entry *table, *entry; | |
584 | struct hlist_head *dispatch_list, *unknown_dispatch_list; | |
585 | size_t table_len; | |
586 | long id; | |
587 | ||
588 | id = syscall_get_nr(current, regs); | |
589 | ||
590 | if (unlikely(in_compat_syscall())) { | |
591 | struct lttng_syscall_filter *filter = group->sc_filter; | |
592 | ||
593 | if (id < 0 || id >= NR_compat_syscalls | |
594 | || (!READ_ONCE(group->syscall_all_exit) && | |
595 | !test_bit(id, filter->sc_compat_exit))) { | |
596 | /* System call filtered out. */ | |
597 | return; | |
598 | } | |
f385fc5f FD |
599 | table = compat_sc_exit_table.table; |
600 | table_len = compat_sc_exit_table.len; | |
8a8ac9a8 FD |
601 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; |
602 | } else { | |
603 | struct lttng_syscall_filter *filter = group->sc_filter; | |
604 | ||
605 | if (id < 0 || id >= NR_syscalls | |
606 | || (!READ_ONCE(group->syscall_all_exit) && | |
607 | !test_bit(id, filter->sc_exit))) { | |
608 | /* System call filtered out. */ | |
609 | return; | |
610 | } | |
f385fc5f FD |
611 | table = sc_exit_table.table; |
612 | table_len = sc_exit_table.len; | |
8a8ac9a8 FD |
613 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; |
614 | } | |
615 | /* Check if the syscall id is out of bound. */ | |
616 | if (unlikely(id < 0 || id >= table_len)) { | |
e2d5dbc7 | 617 | syscall_exit_event_unknown(unknown_dispatch_list, |
8a8ac9a8 FD |
618 | regs, id, ret); |
619 | return; | |
620 | } | |
621 | ||
622 | entry = &table[id]; | |
e2d5dbc7 MD |
623 | if (!entry->event_func) { |
624 | syscall_entry_event_unknown(unknown_dispatch_list, | |
8a8ac9a8 FD |
625 | regs, id); |
626 | return; | |
627 | } | |
628 | ||
629 | if (unlikely(in_compat_syscall())) { | |
630 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id]; | |
631 | } else { | |
632 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[id]; | |
633 | } | |
634 | if (unlikely(hlist_empty(dispatch_list))) | |
635 | return; | |
636 | ||
e2d5dbc7 MD |
637 | syscall_exit_event_call_func(dispatch_list, |
638 | entry->event_func, entry->nrargs, regs, ret); | |
8a8ac9a8 | 639 | } |
33a39a3c MD |
640 | /* |
641 | * noinline to diminish caller stack size. | |
642 | * Should be called with sessions lock held. | |
643 | */ | |
49c50022 | 644 | static |
3b82c4e1 MD |
645 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
646 | struct hlist_head *chan_table, struct lttng_event_enabler *event_enabler, | |
a67ba386 | 647 | enum sc_type type) |
259b6cb3 | 648 | { |
ac847066 MD |
649 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
650 | struct lttng_kernel_session *session = chan->parent.session; | |
259b6cb3 | 651 | unsigned int i; |
49c50022 | 652 | |
3b82c4e1 | 653 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 654 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 655 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
606828e4 | 656 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
657 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
658 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
659 | struct hlist_head *head; |
660 | bool found = false; | |
49c50022 MD |
661 | |
662 | if (!desc) { | |
663 | /* Unknown syscall */ | |
664 | continue; | |
665 | } | |
3b82c4e1 MD |
666 | if (lttng_desc_match_enabler(desc, |
667 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
668 | continue; | |
49c50022 | 669 | /* |
3b82c4e1 | 670 | * Check if already created. |
49c50022 | 671 | */ |
3b82c4e1 | 672 | head = utils_borrow_hash_table_bucket( |
a40e3229 | 673 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 674 | desc->event_name); |
a67ba386 MD |
675 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
676 | if (event_recorder_priv->parent.desc == desc | |
677 | && event_recorder_priv->pub->chan == event_enabler->chan) | |
3b82c4e1 MD |
678 | found = true; |
679 | } | |
680 | if (found) | |
49c50022 | 681 | continue; |
3b82c4e1 MD |
682 | |
683 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 684 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
685 | switch (type) { |
686 | case SC_TYPE_ENTRY: | |
606828e4 MD |
687 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
688 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
689 | break; |
690 | case SC_TYPE_EXIT: | |
606828e4 MD |
691 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
692 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
693 | break; |
694 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
695 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
696 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
697 | break; |
698 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
699 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
700 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
701 | break; |
702 | } | |
606828e4 MD |
703 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
704 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
705 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
a67ba386 MD |
706 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, ev.instrumentation); |
707 | WARN_ON_ONCE(!event_recorder); | |
708 | if (IS_ERR(event_recorder)) { | |
49c50022 MD |
709 | /* |
710 | * If something goes wrong in event registration | |
711 | * after the first one, we have no choice but to | |
712 | * leave the previous events in there, until | |
713 | * deleted by session teardown. | |
714 | */ | |
a67ba386 | 715 | return PTR_ERR(event_recorder); |
49c50022 | 716 | } |
a67ba386 | 717 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
718 | } |
719 | return 0; | |
720 | } | |
721 | ||
33a39a3c MD |
722 | /* |
723 | * Should be called with sessions lock held. | |
724 | */ | |
a67ba386 | 725 | int lttng_syscalls_register_event(struct lttng_event_enabler *event_enabler) |
49c50022 | 726 | { |
ac847066 | 727 | struct lttng_kernel_channel_buffer *chan = event_enabler->chan; |
606828e4 | 728 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
729 | int ret; |
730 | ||
263b6c88 | 731 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 | 732 | |
ac847066 | 733 | if (!chan->priv->parent.sc_table) { |
259b6cb3 | 734 | /* create syscall table mapping syscall to events */ |
ac847066 | 735 | chan->priv->parent.sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 736 | * sc_table.len, GFP_KERNEL); |
ac847066 | 737 | if (!chan->priv->parent.sc_table) |
259b6cb3 MD |
738 | return -ENOMEM; |
739 | } | |
ac847066 | 740 | if (!chan->priv->parent.sc_exit_table) { |
5b7ac358 | 741 | /* create syscall table mapping syscall to events */ |
ac847066 | 742 | chan->priv->parent.sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 743 | * sc_exit_table.len, GFP_KERNEL); |
ac847066 | 744 | if (!chan->priv->parent.sc_exit_table) |
5b7ac358 MD |
745 | return -ENOMEM; |
746 | } | |
747 | ||
259b6cb3 | 748 | |
49c50022 | 749 | #ifdef CONFIG_COMPAT |
ac847066 | 750 | if (!chan->priv->parent.compat_sc_table) { |
49c50022 | 751 | /* create syscall table mapping compat syscall to events */ |
ac847066 | 752 | chan->priv->parent.compat_sc_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 753 | * compat_sc_table.len, GFP_KERNEL); |
ac847066 | 754 | if (!chan->priv->parent.compat_sc_table) |
49c50022 MD |
755 | return -ENOMEM; |
756 | } | |
5b7ac358 | 757 | |
ac847066 | 758 | if (!chan->priv->parent.compat_sc_exit_table) { |
5b7ac358 | 759 | /* create syscall table mapping compat syscall to events */ |
ac847066 | 760 | chan->priv->parent.compat_sc_exit_table = kzalloc(sizeof(struct lttng_kernel_event_recorder *) |
f385fc5f | 761 | * compat_sc_exit_table.len, GFP_KERNEL); |
ac847066 | 762 | if (!chan->priv->parent.compat_sc_exit_table) |
5b7ac358 MD |
763 | return -ENOMEM; |
764 | } | |
49c50022 | 765 | #endif |
ac847066 | 766 | if (hlist_empty(&chan->priv->parent.sc_unknown)) { |
437d5aa5 | 767 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 768 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 769 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a | 770 | |
f405cfce | 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_NATIVE; | |
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); | |
f405cfce | 782 | } |
ac847066 | 783 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_unknown); |
f405cfce MD |
784 | } |
785 | ||
ac847066 | 786 | if (hlist_empty(&chan->priv->parent.sc_compat_unknown)) { |
437d5aa5 | 787 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 788 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 789 | struct lttng_kernel_event_recorder *event_recorder; |
b76dc1a0 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_ENTRY; | |
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); | |
b76dc1a0 | 802 | } |
ac847066 | 803 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_compat_unknown); |
b76dc1a0 MD |
804 | } |
805 | ||
ac847066 | 806 | if (hlist_empty(&chan->priv->parent.compat_sc_exit_unknown)) { |
437d5aa5 | 807 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 808 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 809 | struct lttng_kernel_event_recorder *event_recorder; |
2f804c0a 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_COMPAT; | |
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); | |
5b7ac358 | 822 | } |
ac847066 | 823 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.compat_sc_exit_unknown); |
5b7ac358 MD |
824 | } |
825 | ||
ac847066 | 826 | if (hlist_empty(&chan->priv->parent.sc_exit_unknown)) { |
437d5aa5 | 827 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 828 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 829 | struct lttng_kernel_event_recorder *event_recorder; |
5b7ac358 MD |
830 | |
831 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
832 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
833 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
834 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
835 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
836 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
a67ba386 | 837 | event_recorder = _lttng_kernel_event_recorder_create(chan, &ev, desc, |
3b82c4e1 | 838 | ev.instrumentation); |
a67ba386 MD |
839 | WARN_ON_ONCE(!event_recorder); |
840 | if (IS_ERR(event_recorder)) { | |
841 | return PTR_ERR(event_recorder); | |
2f804c0a | 842 | } |
ac847066 | 843 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan->priv->parent.sc_exit_unknown); |
2f804c0a MD |
844 | } |
845 | ||
f385fc5f | 846 | ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, |
ac847066 | 847 | chan->priv->parent.sc_table, event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
848 | if (ret) |
849 | return ret; | |
f385fc5f | 850 | ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, |
ac847066 | 851 | chan->priv->parent.sc_exit_table, event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
852 | if (ret) |
853 | return ret; | |
5b7ac358 | 854 | |
49c50022 | 855 | #ifdef CONFIG_COMPAT |
f385fc5f | 856 | ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, |
ac847066 | 857 | chan->priv->parent.compat_sc_table, event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
858 | if (ret) |
859 | return ret; | |
f385fc5f | 860 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, |
ac847066 | 861 | chan->priv->parent.compat_sc_exit_table, event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
862 | if (ret) |
863 | return ret; | |
864 | #endif | |
badfe9f5 | 865 | |
ac847066 MD |
866 | if (!chan->priv->parent.sc_filter) { |
867 | chan->priv->parent.sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
badfe9f5 | 868 | GFP_KERNEL); |
ac847066 | 869 | if (!chan->priv->parent.sc_filter) |
badfe9f5 MD |
870 | return -ENOMEM; |
871 | } | |
872 | ||
ac847066 | 873 | if (!chan->priv->parent.sys_enter_registered) { |
80f87dd2 | 874 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
2d6d88c6 | 875 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
876 | if (ret) |
877 | return ret; | |
ac847066 | 878 | chan->priv->parent.sys_enter_registered = 1; |
80f87dd2 | 879 | } |
63728b02 MD |
880 | /* |
881 | * We change the name of sys_exit tracepoint due to namespace | |
882 | * conflict with sys_exit syscall entry. | |
883 | */ | |
ac847066 | 884 | if (!chan->priv->parent.sys_exit_registered) { |
80f87dd2 | 885 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
2d6d88c6 | 886 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
887 | if (ret) { |
888 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
2d6d88c6 | 889 | (void *) syscall_entry_event_probe, chan)); |
80f87dd2 MD |
890 | return ret; |
891 | } | |
ac847066 | 892 | chan->priv->parent.sys_exit_registered = 1; |
63728b02 | 893 | } |
259b6cb3 MD |
894 | return ret; |
895 | } | |
896 | ||
897 | /* | |
8a8ac9a8 FD |
898 | * Should be called with sessions lock held. |
899 | */ | |
900 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 901 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
902 | { |
903 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
904 | unsigned int i; | |
905 | int ret = 0; | |
906 | ||
907 | wrapper_vmalloc_sync_mappings(); | |
908 | ||
909 | if (!group->event_notifier_syscall_dispatch) { | |
910 | group->event_notifier_syscall_dispatch = | |
f385fc5f | 911 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
912 | GFP_KERNEL); |
913 | if (!group->event_notifier_syscall_dispatch) | |
914 | return -ENOMEM; | |
915 | ||
916 | /* Initialize all list_head */ | |
f385fc5f | 917 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
918 | INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]); |
919 | ||
920 | /* Init the unknown syscall notifier list. */ | |
921 | INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch); | |
922 | } | |
923 | ||
924 | if (!group->event_notifier_exit_syscall_dispatch) { | |
925 | group->event_notifier_exit_syscall_dispatch = | |
f385fc5f | 926 | kzalloc(sizeof(struct hlist_head) * sc_table.len, |
8a8ac9a8 FD |
927 | GFP_KERNEL); |
928 | if (!group->event_notifier_exit_syscall_dispatch) | |
929 | return -ENOMEM; | |
930 | ||
931 | /* Initialize all list_head */ | |
f385fc5f | 932 | for (i = 0; i < sc_table.len; i++) |
8a8ac9a8 FD |
933 | INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]); |
934 | ||
935 | /* Init the unknown exit syscall notifier list. */ | |
936 | INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch); | |
937 | } | |
938 | ||
939 | #ifdef CONFIG_COMPAT | |
940 | if (!group->event_notifier_compat_syscall_dispatch) { | |
941 | group->event_notifier_compat_syscall_dispatch = | |
f385fc5f | 942 | kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, |
8a8ac9a8 FD |
943 | GFP_KERNEL); |
944 | if (!group->event_notifier_syscall_dispatch) | |
945 | return -ENOMEM; | |
946 | ||
947 | /* Initialize all list_head */ | |
f385fc5f | 948 | for (i = 0; i < compat_sc_table.len; i++) |
8a8ac9a8 FD |
949 | INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]); |
950 | ||
951 | /* Init the unknown syscall notifier list. */ | |
952 | INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch); | |
953 | } | |
954 | ||
955 | if (!group->event_notifier_exit_compat_syscall_dispatch) { | |
956 | group->event_notifier_exit_compat_syscall_dispatch = | |
f385fc5f | 957 | kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, |
8a8ac9a8 FD |
958 | GFP_KERNEL); |
959 | if (!group->event_notifier_exit_syscall_dispatch) | |
960 | return -ENOMEM; | |
961 | ||
962 | /* Initialize all list_head */ | |
f385fc5f | 963 | for (i = 0; i < compat_sc_exit_table.len; i++) |
8a8ac9a8 FD |
964 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]); |
965 | ||
966 | /* Init the unknown exit syscall notifier list. */ | |
967 | INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch); | |
968 | } | |
969 | #endif | |
970 | ||
971 | if (!group->sc_filter) { | |
972 | group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
973 | GFP_KERNEL); | |
974 | if (!group->sc_filter) | |
975 | return -ENOMEM; | |
976 | } | |
977 | ||
978 | if (!group->sys_enter_registered) { | |
979 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", | |
980 | (void *) syscall_entry_event_notifier_probe, group); | |
981 | if (ret) | |
982 | return ret; | |
983 | group->sys_enter_registered = 1; | |
984 | } | |
985 | ||
986 | if (!group->sys_exit_registered) { | |
987 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", | |
988 | (void *) syscall_exit_event_notifier_probe, group); | |
989 | if (ret) { | |
990 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
991 | (void *) syscall_entry_event_notifier_probe, group)); | |
992 | return ret; | |
993 | } | |
994 | group->sys_exit_registered = 1; | |
995 | } | |
996 | ||
997 | return ret; | |
998 | } | |
999 | ||
1000 | static | |
1001 | int create_unknown_event_notifier( | |
1002 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1003 | enum sc_type type) | |
1004 | { | |
a67ba386 MD |
1005 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1006 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 1007 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1008 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
606828e4 | 1009 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 | 1010 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1011 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1012 | struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler( |
1013 | event_notifier_enabler); | |
1014 | struct hlist_head *unknown_dispatch_list; | |
1015 | int ret = 0; | |
1016 | bool found = false; | |
606828e4 MD |
1017 | enum lttng_kernel_abi_syscall_abi abi; |
1018 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
1019 | struct hlist_head *head; |
1020 | ||
1021 | switch (type) { | |
1022 | case SC_TYPE_ENTRY: | |
1023 | desc = &__event_desc___syscall_entry_unknown; | |
1024 | unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch; | |
606828e4 MD |
1025 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1026 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1027 | break; |
1028 | case SC_TYPE_EXIT: | |
1029 | desc = &__event_desc___syscall_exit_unknown; | |
1030 | unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch; | |
606828e4 MD |
1031 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1032 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1033 | break; |
1034 | case SC_TYPE_COMPAT_ENTRY: | |
1035 | desc = &__event_desc___compat_syscall_entry_unknown; | |
1036 | unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1037 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1038 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1039 | break; |
1040 | case SC_TYPE_COMPAT_EXIT: | |
1041 | desc = &__event_desc___compat_syscall_exit_unknown; | |
1042 | unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch; | |
606828e4 MD |
1043 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1044 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1045 | break; |
1046 | default: | |
1047 | BUG_ON(1); | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * Check if already created. | |
1052 | */ | |
1053 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1054 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1055 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1056 | if (event_notifier_priv->parent.desc == desc && | |
1057 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
1058 | found = true; |
1059 | } | |
1060 | if (found) | |
1061 | goto end; | |
1062 | ||
1063 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 1064 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 1065 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 1066 | |
606828e4 | 1067 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 1068 | |
606828e4 | 1069 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
1070 | event_notifier_param.event.u.syscall.abi = abi; |
1071 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1072 | ||
a67ba386 MD |
1073 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1074 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 1075 | event_notifier_param.event.instrumentation); |
a67ba386 | 1076 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 1077 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 1078 | desc->event_name); |
8a8ac9a8 FD |
1079 | ret = -ENOMEM; |
1080 | goto end; | |
1081 | } | |
1082 | ||
a67ba386 | 1083 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
1084 | |
1085 | end: | |
1086 | return ret; | |
1087 | } | |
1088 | ||
1089 | static int create_matching_event_notifiers( | |
1090 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 1091 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
1092 | size_t table_len, enum sc_type type) |
1093 | { | |
1094 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 1095 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 1096 | uint64_t user_token = event_notifier_enabler->base.user_token; |
99f52fcc | 1097 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
1098 | unsigned int i; |
1099 | int ret = 0; | |
1100 | ||
1101 | /* iterate over all syscall and create event_notifier that match */ | |
1102 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
1103 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
1104 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 1105 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
1106 | struct hlist_head *head; |
1107 | int found = 0; | |
1108 | ||
1109 | desc = table[i].desc; | |
1110 | if (!desc) { | |
1111 | /* Unknown syscall */ | |
1112 | continue; | |
1113 | } | |
1114 | ||
1115 | if (!lttng_desc_match_enabler(desc, | |
1116 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1117 | continue; | |
1118 | ||
1119 | /* | |
1120 | * Check if already created. | |
1121 | */ | |
1122 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1123 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1124 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1125 | if (event_notifier_priv->parent.desc == desc | |
1126 | && event_notifier_priv->parent.user_token == event_notifier_enabler->base.user_token) | |
8a8ac9a8 FD |
1127 | found = 1; |
1128 | } | |
1129 | if (found) | |
1130 | continue; | |
1131 | ||
1132 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1133 | switch (type) { | |
1134 | case SC_TYPE_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_NATIVE; | |
8a8ac9a8 FD |
1137 | break; |
1138 | case SC_TYPE_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_NATIVE; | |
8a8ac9a8 FD |
1141 | break; |
1142 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1143 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1144 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1145 | break; |
1146 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1147 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1148 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1149 | break; |
1150 | } | |
437d5aa5 | 1151 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1152 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1153 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1154 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1155 | |
99f52fcc FD |
1156 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1157 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1158 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1159 | if (IS_ERR(event_notifier)) { |
1160 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1161 | desc->event_name); |
8a8ac9a8 FD |
1162 | ret = -ENOMEM; |
1163 | goto end; | |
1164 | } | |
1165 | ||
a67ba386 | 1166 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1167 | } |
1168 | ||
1169 | end: | |
1170 | return ret; | |
1171 | ||
1172 | } | |
1173 | ||
a67ba386 MD |
1174 | int lttng_syscalls_create_matching_event_notifiers( |
1175 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1176 | { |
1177 | int ret; | |
1178 | struct lttng_enabler *base_enabler = | |
1179 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); | |
606828e4 | 1180 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1181 | base_enabler->event_param.u.syscall.entryexit; |
1182 | ||
606828e4 | 1183 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1184 | ret = create_matching_event_notifiers(event_notifier_enabler, |
f385fc5f | 1185 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1186 | if (ret) |
1187 | goto end; | |
1188 | ||
1189 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
f385fc5f | 1190 | compat_sc_table.table, compat_sc_table.len, |
8a8ac9a8 FD |
1191 | SC_TYPE_COMPAT_ENTRY); |
1192 | if (ret) | |
1193 | goto end; | |
1194 | ||
1195 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1196 | SC_TYPE_ENTRY); | |
1197 | if (ret) | |
1198 | goto end; | |
1199 | ||
1200 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1201 | SC_TYPE_COMPAT_ENTRY); | |
1202 | if (ret) | |
1203 | goto end; | |
1204 | } | |
1205 | ||
606828e4 | 1206 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1207 | ret = create_matching_event_notifiers(event_notifier_enabler, |
f385fc5f | 1208 | sc_exit_table.table, sc_exit_table.len, |
8a8ac9a8 FD |
1209 | SC_TYPE_EXIT); |
1210 | if (ret) | |
1211 | goto end; | |
1212 | ||
1213 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1214 | SC_TYPE_EXIT); | |
1215 | if (ret) | |
1216 | goto end; | |
1217 | ||
1218 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
f385fc5f | 1219 | compat_sc_exit_table.table, compat_sc_exit_table.len, |
8a8ac9a8 FD |
1220 | SC_TYPE_COMPAT_EXIT); |
1221 | if (ret) | |
1222 | goto end; | |
1223 | ||
1224 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1225 | SC_TYPE_COMPAT_EXIT); | |
1226 | if (ret) | |
1227 | goto end; | |
1228 | } | |
1229 | ||
1230 | end: | |
1231 | return ret; | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Unregister the syscall event_notifier probes from the callsites. | |
259b6cb3 | 1236 | */ |
3b82c4e1 | 1237 | int lttng_syscalls_unregister_event_notifier_group( |
8a8ac9a8 FD |
1238 | struct lttng_event_notifier_group *event_notifier_group) |
1239 | { | |
1240 | int ret; | |
1241 | ||
1242 | /* | |
1243 | * Only register the event_notifier probe on the `sys_enter` callsite for now. | |
1244 | * At the moment, we don't think it's desirable to have one fired | |
1245 | * event_notifier for the entry and one for the exit of a syscall. | |
1246 | */ | |
1247 | if (event_notifier_group->sys_enter_registered) { | |
1248 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
1249 | (void *) syscall_entry_event_notifier_probe, event_notifier_group); | |
1250 | if (ret) | |
1251 | return ret; | |
1252 | event_notifier_group->sys_enter_registered = 0; | |
1253 | } | |
1254 | if (event_notifier_group->sys_exit_registered) { | |
1255 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", | |
1256 | (void *) syscall_exit_event_notifier_probe, event_notifier_group); | |
1257 | if (ret) | |
1258 | return ret; | |
1259 | event_notifier_group->sys_enter_registered = 0; | |
1260 | } | |
1261 | ||
1262 | kfree(event_notifier_group->event_notifier_syscall_dispatch); | |
1263 | kfree(event_notifier_group->event_notifier_exit_syscall_dispatch); | |
1264 | #ifdef CONFIG_COMPAT | |
1265 | kfree(event_notifier_group->event_notifier_compat_syscall_dispatch); | |
1266 | kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch); | |
1267 | #endif | |
1268 | return 0; | |
1269 | } | |
1270 | ||
ac847066 | 1271 | int lttng_syscalls_unregister_channel(struct lttng_kernel_channel_buffer *chan) |
259b6cb3 MD |
1272 | { |
1273 | int ret; | |
1274 | ||
ac847066 | 1275 | if (!chan->priv->parent.sc_table) |
259b6cb3 | 1276 | return 0; |
ac847066 | 1277 | if (chan->priv->parent.sys_enter_registered) { |
2d9cd7f3 | 1278 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
2d6d88c6 | 1279 | (void *) syscall_entry_event_probe, chan); |
80f87dd2 MD |
1280 | if (ret) |
1281 | return ret; | |
ac847066 | 1282 | chan->priv->parent.sys_enter_registered = 0; |
80f87dd2 | 1283 | } |
ac847066 | 1284 | if (chan->priv->parent.sys_exit_registered) { |
2d9cd7f3 | 1285 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
2d6d88c6 | 1286 | (void *) syscall_exit_event_probe, chan); |
80f87dd2 MD |
1287 | if (ret) |
1288 | return ret; | |
ac847066 | 1289 | chan->priv->parent.sys_exit_registered = 0; |
80f87dd2 | 1290 | } |
badfe9f5 MD |
1291 | return 0; |
1292 | } | |
1293 | ||
ac847066 | 1294 | int lttng_syscalls_destroy_event(struct lttng_kernel_channel_buffer *chan) |
badfe9f5 | 1295 | { |
ac847066 MD |
1296 | kfree(chan->priv->parent.sc_table); |
1297 | kfree(chan->priv->parent.sc_exit_table); | |
49c50022 | 1298 | #ifdef CONFIG_COMPAT |
ac847066 MD |
1299 | kfree(chan->priv->parent.compat_sc_table); |
1300 | kfree(chan->priv->parent.compat_sc_exit_table); | |
49c50022 | 1301 | #endif |
ac847066 | 1302 | kfree(chan->priv->parent.sc_filter); |
80f87dd2 MD |
1303 | return 0; |
1304 | } | |
1305 | ||
1306 | static | |
1307 | int get_syscall_nr(const char *syscall_name) | |
1308 | { | |
1309 | int syscall_nr = -1; | |
1310 | int i; | |
1311 | ||
f385fc5f | 1312 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 1313 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1314 | const char *it_name; |
80f87dd2 | 1315 | |
f385fc5f | 1316 | entry = &sc_table.table[i]; |
80f87dd2 MD |
1317 | if (!entry->desc) |
1318 | continue; | |
437d5aa5 | 1319 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1320 | it_name += strlen(SYSCALL_ENTRY_STR); |
1321 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1322 | syscall_nr = i; |
1323 | break; | |
1324 | } | |
1325 | } | |
1326 | return syscall_nr; | |
1327 | } | |
1328 | ||
1329 | static | |
1330 | int get_compat_syscall_nr(const char *syscall_name) | |
1331 | { | |
1332 | int syscall_nr = -1; | |
1333 | int i; | |
1334 | ||
f385fc5f | 1335 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 1336 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1337 | const char *it_name; |
80f87dd2 | 1338 | |
f385fc5f | 1339 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
1340 | if (!entry->desc) |
1341 | continue; | |
437d5aa5 | 1342 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1343 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1344 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1345 | syscall_nr = i; |
1346 | break; | |
1347 | } | |
1348 | } | |
1349 | return syscall_nr; | |
1350 | } | |
1351 | ||
12e579db MD |
1352 | static |
1353 | uint32_t get_sc_tables_len(void) | |
1354 | { | |
f385fc5f | 1355 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
1356 | } |
1357 | ||
badfe9f5 | 1358 | static |
ade8a729 FD |
1359 | const char *get_syscall_name(const char *desc_name, |
1360 | enum lttng_syscall_abi abi, | |
1361 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1362 | { |
badfe9f5 | 1363 | size_t prefix_len = 0; |
80f87dd2 | 1364 | |
80f87dd2 | 1365 | |
ade8a729 | 1366 | switch (entryexit) { |
badfe9f5 | 1367 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1368 | switch (abi) { |
badfe9f5 MD |
1369 | case LTTNG_SYSCALL_ABI_NATIVE: |
1370 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1371 | break; | |
1372 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1373 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1374 | break; | |
80f87dd2 | 1375 | } |
badfe9f5 MD |
1376 | break; |
1377 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1378 | switch (abi) { |
badfe9f5 MD |
1379 | case LTTNG_SYSCALL_ABI_NATIVE: |
1380 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1381 | break; | |
1382 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1383 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1384 | break; | |
80f87dd2 | 1385 | } |
badfe9f5 | 1386 | break; |
80f87dd2 | 1387 | } |
badfe9f5 | 1388 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1389 | return desc_name + prefix_len; |
badfe9f5 MD |
1390 | } |
1391 | ||
ade8a729 FD |
1392 | static |
1393 | int lttng_syscall_filter_enable( | |
1394 | struct lttng_syscall_filter *filter, | |
1395 | const char *desc_name, enum lttng_syscall_abi abi, | |
1396 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1397 | { |
badfe9f5 MD |
1398 | const char *syscall_name; |
1399 | unsigned long *bitmap; | |
4fabf854 | 1400 | u32 *refcount_map; |
badfe9f5 MD |
1401 | int syscall_nr; |
1402 | ||
ade8a729 | 1403 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1404 | |
ade8a729 | 1405 | switch (abi) { |
badfe9f5 MD |
1406 | case LTTNG_SYSCALL_ABI_NATIVE: |
1407 | syscall_nr = get_syscall_nr(syscall_name); | |
1408 | break; | |
1409 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1410 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1411 | break; | |
1412 | default: | |
1413 | return -EINVAL; | |
80f87dd2 | 1414 | } |
badfe9f5 MD |
1415 | if (syscall_nr < 0) |
1416 | return -ENOENT; | |
1417 | ||
ade8a729 | 1418 | switch (entryexit) { |
badfe9f5 | 1419 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1420 | switch (abi) { |
badfe9f5 MD |
1421 | case LTTNG_SYSCALL_ABI_NATIVE: |
1422 | bitmap = filter->sc_entry; | |
4fabf854 | 1423 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1424 | break; |
1425 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1426 | bitmap = filter->sc_compat_entry; | |
4fabf854 | 1427 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1428 | break; |
6d9694d8 MD |
1429 | default: |
1430 | return -EINVAL; | |
80f87dd2 | 1431 | } |
badfe9f5 MD |
1432 | break; |
1433 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1434 | switch (abi) { |
badfe9f5 MD |
1435 | case LTTNG_SYSCALL_ABI_NATIVE: |
1436 | bitmap = filter->sc_exit; | |
4fabf854 | 1437 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1438 | break; |
1439 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1440 | bitmap = filter->sc_compat_exit; | |
4fabf854 | 1441 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1442 | break; |
6d9694d8 MD |
1443 | default: |
1444 | return -EINVAL; | |
80f87dd2 | 1445 | } |
badfe9f5 MD |
1446 | break; |
1447 | default: | |
1448 | return -EINVAL; | |
80f87dd2 | 1449 | } |
4fabf854 MD |
1450 | if (refcount_map[syscall_nr] == U32_MAX) |
1451 | return -EOVERFLOW; | |
1452 | if (refcount_map[syscall_nr]++ == 0) | |
1453 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1454 | return 0; |
80f87dd2 MD |
1455 | } |
1456 | ||
8a8ac9a8 | 1457 | int lttng_syscall_filter_enable_event_notifier( |
a67ba386 | 1458 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1459 | { |
a67ba386 MD |
1460 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
1461 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; | |
8a8ac9a8 FD |
1462 | struct hlist_head *dispatch_list; |
1463 | int ret = 0; | |
1464 | ||
a67ba386 | 1465 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1466 | |
4fabf854 MD |
1467 | /* Skip unknown syscall */ |
1468 | if (syscall_id == -1U) | |
1469 | return 0; | |
1470 | ||
8a8ac9a8 | 1471 | ret = lttng_syscall_filter_enable(group->sc_filter, |
a67ba386 MD |
1472 | event_notifier->priv->parent.desc->event_name, |
1473 | event_notifier->priv->parent.u.syscall.abi, | |
1474 | event_notifier->priv->parent.u.syscall.entryexit); | |
4fabf854 MD |
1475 | if (ret) |
1476 | return ret; | |
8a8ac9a8 | 1477 | |
a67ba386 | 1478 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 1479 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 1480 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1481 | case LTTNG_SYSCALL_ABI_NATIVE: |
1482 | dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id]; | |
1483 | break; | |
1484 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1485 | dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id]; | |
1486 | break; | |
6866b1c7 MJ |
1487 | default: |
1488 | ret = -EINVAL; | |
1489 | goto end; | |
8a8ac9a8 FD |
1490 | } |
1491 | break; | |
1492 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 1493 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 FD |
1494 | case LTTNG_SYSCALL_ABI_NATIVE: |
1495 | dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id]; | |
1496 | break; | |
1497 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1498 | dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id]; | |
1499 | break; | |
6866b1c7 MJ |
1500 | default: |
1501 | ret = -EINVAL; | |
1502 | goto end; | |
8a8ac9a8 FD |
1503 | } |
1504 | break; | |
6866b1c7 MJ |
1505 | default: |
1506 | ret = -EINVAL; | |
1507 | goto end; | |
8a8ac9a8 FD |
1508 | } |
1509 | ||
a67ba386 | 1510 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
1511 | |
1512 | end: | |
4fabf854 | 1513 | return ret; |
8a8ac9a8 FD |
1514 | } |
1515 | ||
ade8a729 | 1516 | int lttng_syscall_filter_enable_event( |
ac847066 | 1517 | struct lttng_kernel_channel_buffer *channel, |
a67ba386 | 1518 | struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 1519 | { |
4fabf854 MD |
1520 | unsigned int syscall_id = event_recorder->priv->parent.u.syscall.syscall_id; |
1521 | ||
a67ba386 | 1522 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 | 1523 | |
4fabf854 MD |
1524 | /* Skip unknown syscall */ |
1525 | if (syscall_id == -1U) | |
1526 | return 0; | |
1527 | ||
ac847066 | 1528 | return lttng_syscall_filter_enable(channel->priv->parent.sc_filter, |
a67ba386 MD |
1529 | event_recorder->priv->parent.desc->event_name, |
1530 | event_recorder->priv->parent.u.syscall.abi, | |
1531 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1532 | } |
1533 | ||
1534 | static | |
1535 | int lttng_syscall_filter_disable( | |
1536 | struct lttng_syscall_filter *filter, | |
1537 | const char *desc_name, enum lttng_syscall_abi abi, | |
1538 | enum lttng_syscall_entryexit entryexit) | |
1539 | { | |
badfe9f5 MD |
1540 | const char *syscall_name; |
1541 | unsigned long *bitmap; | |
4fabf854 | 1542 | u32 *refcount_map; |
badfe9f5 | 1543 | int syscall_nr; |
80f87dd2 | 1544 | |
ade8a729 | 1545 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1546 | |
ade8a729 | 1547 | switch (abi) { |
badfe9f5 MD |
1548 | case LTTNG_SYSCALL_ABI_NATIVE: |
1549 | syscall_nr = get_syscall_nr(syscall_name); | |
1550 | break; | |
1551 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1552 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1553 | break; | |
1554 | default: | |
1555 | return -EINVAL; | |
80f87dd2 | 1556 | } |
badfe9f5 MD |
1557 | if (syscall_nr < 0) |
1558 | return -ENOENT; | |
80f87dd2 | 1559 | |
ade8a729 | 1560 | switch (entryexit) { |
badfe9f5 | 1561 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1562 | switch (abi) { |
badfe9f5 MD |
1563 | case LTTNG_SYSCALL_ABI_NATIVE: |
1564 | bitmap = filter->sc_entry; | |
4fabf854 | 1565 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1566 | break; |
1567 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1568 | bitmap = filter->sc_compat_entry; | |
4fabf854 | 1569 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1570 | break; |
6d9694d8 MD |
1571 | default: |
1572 | return -EINVAL; | |
80f87dd2 | 1573 | } |
badfe9f5 MD |
1574 | break; |
1575 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1576 | switch (abi) { |
badfe9f5 MD |
1577 | case LTTNG_SYSCALL_ABI_NATIVE: |
1578 | bitmap = filter->sc_exit; | |
4fabf854 | 1579 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1580 | break; |
1581 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1582 | bitmap = filter->sc_compat_exit; | |
4fabf854 | 1583 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1584 | break; |
6d9694d8 MD |
1585 | default: |
1586 | return -EINVAL; | |
80f87dd2 | 1587 | } |
badfe9f5 MD |
1588 | break; |
1589 | default: | |
1590 | return -EINVAL; | |
80f87dd2 | 1591 | } |
4fabf854 MD |
1592 | if (refcount_map[syscall_nr] == 0) |
1593 | return -ENOENT; | |
1594 | if (--refcount_map[syscall_nr] == 0) | |
1595 | bitmap_clear(bitmap, syscall_nr, 1); | |
badfe9f5 | 1596 | return 0; |
259b6cb3 | 1597 | } |
2d2464bd | 1598 | |
8a8ac9a8 | 1599 | int lttng_syscall_filter_disable_event_notifier( |
a67ba386 | 1600 | struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1601 | { |
a67ba386 | 1602 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
4fabf854 | 1603 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; |
8a8ac9a8 FD |
1604 | int ret; |
1605 | ||
a67ba386 | 1606 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1607 | |
4fabf854 MD |
1608 | /* Skip unknown syscall */ |
1609 | if (syscall_id == -1U) | |
1610 | return 0; | |
1611 | ||
8a8ac9a8 | 1612 | ret = lttng_syscall_filter_disable(group->sc_filter, |
a67ba386 MD |
1613 | event_notifier->priv->parent.desc->event_name, |
1614 | event_notifier->priv->parent.u.syscall.abi, | |
1615 | event_notifier->priv->parent.u.syscall.entryexit); | |
4fabf854 MD |
1616 | if (ret) |
1617 | return ret; | |
8a8ac9a8 | 1618 | |
a67ba386 | 1619 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
1620 | return 0; |
1621 | } | |
1622 | ||
ade8a729 | 1623 | int lttng_syscall_filter_disable_event( |
ac847066 | 1624 | struct lttng_kernel_channel_buffer *channel, |
a67ba386 | 1625 | struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 | 1626 | { |
4fabf854 MD |
1627 | unsigned int syscall_id = event_recorder->priv->parent.u.syscall.syscall_id; |
1628 | ||
1629 | /* Skip unknown syscall */ | |
1630 | if (syscall_id == -1U) | |
1631 | return 0; | |
1632 | ||
ac847066 | 1633 | return lttng_syscall_filter_disable(channel->priv->parent.sc_filter, |
a67ba386 MD |
1634 | event_recorder->priv->parent.desc->event_name, |
1635 | event_recorder->priv->parent.u.syscall.abi, | |
1636 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1637 | } |
1638 | ||
2d2464bd MD |
1639 | static |
1640 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1641 | { | |
1642 | const struct trace_syscall_entry *entry; | |
1643 | int iter = 0; | |
1644 | ||
f385fc5f FD |
1645 | for (entry = sc_table.table; |
1646 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1647 | entry++) { |
1648 | if (iter++ >= *pos) | |
1649 | return entry; | |
1650 | } | |
f385fc5f FD |
1651 | for (entry = compat_sc_table.table; |
1652 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1653 | entry++) { |
1654 | if (iter++ >= *pos) | |
1655 | return entry; | |
1656 | } | |
1657 | /* End of list */ | |
1658 | return NULL; | |
1659 | } | |
1660 | ||
1661 | static | |
1662 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1663 | { | |
1664 | return (void *) syscall_list_get_entry(pos); | |
1665 | } | |
1666 | ||
1667 | static | |
1668 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1669 | { | |
1670 | (*ppos)++; | |
1671 | return (void *) syscall_list_get_entry(ppos); | |
1672 | } | |
1673 | ||
1674 | static | |
1675 | void syscall_list_stop(struct seq_file *m, void *p) | |
1676 | { | |
1677 | } | |
1678 | ||
12e579db MD |
1679 | static |
1680 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1681 | const struct trace_syscall_entry **table, | |
1682 | unsigned int *bitness) | |
1683 | { | |
f385fc5f | 1684 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1685 | if (bitness) |
1686 | *bitness = BITS_PER_LONG; | |
1687 | if (table) | |
f385fc5f | 1688 | *table = sc_table.table; |
12e579db MD |
1689 | return 0; |
1690 | } | |
f385fc5f FD |
1691 | if (!(entry >= compat_sc_table.table |
1692 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1693 | return -EINVAL; |
1694 | } | |
1695 | if (bitness) | |
1696 | *bitness = 32; | |
1697 | if (table) | |
f385fc5f | 1698 | *table = compat_sc_table.table; |
12e579db MD |
1699 | return 0; |
1700 | } | |
1701 | ||
2d2464bd MD |
1702 | static |
1703 | int syscall_list_show(struct seq_file *m, void *p) | |
1704 | { | |
1705 | const struct trace_syscall_entry *table, *entry = p; | |
1706 | unsigned int bitness; | |
d4291869 | 1707 | unsigned long index; |
12e579db | 1708 | int ret; |
d4291869 | 1709 | const char *name; |
2d2464bd | 1710 | |
12e579db MD |
1711 | ret = get_sc_table(entry, &table, &bitness); |
1712 | if (ret) | |
1713 | return ret; | |
f4855b46 MD |
1714 | if (!entry->desc) |
1715 | return 0; | |
f385fc5f | 1716 | if (table == sc_table.table) { |
d4291869 | 1717 | index = entry - table; |
437d5aa5 | 1718 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1719 | } else { |
f385fc5f | 1720 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1721 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1722 | } |
12e579db | 1723 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1724 | index, name, bitness); |
2d2464bd MD |
1725 | return 0; |
1726 | } | |
1727 | ||
1728 | static | |
1729 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1730 | .start = syscall_list_start, | |
1731 | .next = syscall_list_next, | |
1732 | .stop = syscall_list_stop, | |
1733 | .show = syscall_list_show, | |
1734 | }; | |
1735 | ||
1736 | static | |
1737 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1738 | { | |
1739 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1740 | } | |
1741 | ||
1742 | const struct file_operations lttng_syscall_list_fops = { | |
1743 | .owner = THIS_MODULE, | |
1744 | .open = lttng_syscall_list_open, | |
1745 | .read = seq_read, | |
1746 | .llseek = seq_lseek, | |
1747 | .release = seq_release, | |
1748 | }; | |
12e579db | 1749 | |
badfe9f5 MD |
1750 | /* |
1751 | * A syscall is enabled if it is traced for either entry or exit. | |
1752 | */ | |
ac847066 | 1753 | long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer *channel, |
606828e4 | 1754 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1755 | { |
1756 | uint32_t len, sc_tables_len, bitmask_len; | |
1757 | int ret = 0, bit; | |
1758 | char *tmp_mask; | |
1759 | struct lttng_syscall_filter *filter; | |
1760 | ||
1761 | ret = get_user(len, &usyscall_mask->len); | |
1762 | if (ret) | |
1763 | return ret; | |
1764 | sc_tables_len = get_sc_tables_len(); | |
1765 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1766 | if (len < sc_tables_len) { | |
1767 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1768 | } | |
1769 | /* Array is large enough, we can copy array to user-space. */ | |
1770 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1771 | if (!tmp_mask) | |
1772 | return -ENOMEM; | |
ac847066 | 1773 | filter = channel->priv->parent.sc_filter; |
12e579db | 1774 | |
f385fc5f | 1775 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1776 | char state; |
2f25059d | 1777 | |
ac847066 MD |
1778 | if (channel->priv->parent.sc_table) { |
1779 | if (!(READ_ONCE(channel->priv->parent.syscall_all_entry) | |
1780 | || READ_ONCE(channel->priv->parent.syscall_all_exit)) && filter) | |
badfe9f5 MD |
1781 | state = test_bit(bit, filter->sc_entry) |
1782 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1783 | else |
1784 | state = 1; | |
1785 | } else { | |
1786 | state = 0; | |
1787 | } | |
1788 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1789 | } |
1790 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1791 | char state; |
2f25059d | 1792 | |
ac847066 MD |
1793 | if (channel->priv->parent.compat_sc_table) { |
1794 | if (!(READ_ONCE(channel->priv->parent.syscall_all_entry) | |
1795 | || READ_ONCE(channel->priv->parent.syscall_all_exit)) && filter) | |
f385fc5f | 1796 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1797 | filter->sc_compat_entry) |
f385fc5f | 1798 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1799 | filter->sc_compat_exit); |
2f25059d MD |
1800 | else |
1801 | state = 1; | |
1802 | } else { | |
1803 | state = 0; | |
1804 | } | |
1805 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1806 | } |
1807 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1808 | ret = -EFAULT; | |
1809 | kfree(tmp_mask); | |
1810 | return ret; | |
1811 | } | |
082d4946 MD |
1812 | |
1813 | int lttng_abi_syscall_list(void) | |
1814 | { | |
1815 | struct file *syscall_list_file; | |
1816 | int file_fd, ret; | |
1817 | ||
4ac10b76 | 1818 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1819 | if (file_fd < 0) { |
1820 | ret = file_fd; | |
1821 | goto fd_error; | |
1822 | } | |
1823 | ||
1824 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1825 | <tng_syscall_list_fops, | |
1826 | NULL, O_RDWR); | |
1827 | if (IS_ERR(syscall_list_file)) { | |
1828 | ret = PTR_ERR(syscall_list_file); | |
1829 | goto file_error; | |
1830 | } | |
1831 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1832 | if (ret < 0) | |
1833 | goto open_error; | |
1834 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1835 | return file_fd; |
1836 | ||
1837 | open_error: | |
1838 | fput(syscall_list_file); | |
1839 | file_error: | |
1840 | put_unused_fd(file_fd); | |
1841 | fd_error: | |
1842 | return ret; | |
1843 | } |