Commit | Line | Data |
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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
259b6cb3 MD |
3 | * lttng-syscalls.c |
4 | * | |
2faf7d1b | 5 | * LTTng syscall probes. |
259b6cb3 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
259b6cb3 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
6333ace3 | 12 | #include <linux/compat.h> |
abc0446a | 13 | #include <linux/err.h> |
80f87dd2 | 14 | #include <linux/bitmap.h> |
7ca580f8 MD |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
2d2464bd | 17 | #include <linux/seq_file.h> |
d4291869 | 18 | #include <linux/stringify.h> |
082d4946 MD |
19 | #include <linux/file.h> |
20 | #include <linux/anon_inodes.h> | |
c8dfb724 | 21 | #include <linux/fcntl.h> |
3cf55950 | 22 | #include <linux/mman.h> |
259b6cb3 MD |
23 | #include <asm/ptrace.h> |
24 | #include <asm/syscall.h> | |
25 | ||
a071f25d | 26 | #include <lttng/bitfield.h> |
241ae9a8 MD |
27 | #include <wrapper/tracepoint.h> |
28 | #include <wrapper/file.h> | |
29 | #include <wrapper/rcu.h> | |
1b7b9c65 | 30 | #include <wrapper/syscall.h> |
5987e66c | 31 | #include <wrapper/limits.h> |
2df37e95 | 32 | #include <lttng/events.h> |
6f156b09 | 33 | #include <lttng/events-internal.h> |
8a8ac9a8 | 34 | #include <lttng/utils.h> |
259b6cb3 | 35 | |
ebcc64cd FD |
36 | #include "lttng-syscalls.h" |
37 | ||
6333ace3 | 38 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
39 | # ifndef is_compat_task |
40 | # define is_compat_task() (0) | |
41 | # endif | |
6333ace3 MD |
42 | #endif |
43 | ||
1aa3298b MD |
44 | /* in_compat_syscall appears in kernel 4.6. */ |
45 | #ifndef in_compat_syscall | |
46 | #define in_compat_syscall() is_compat_task() | |
47 | #endif | |
48 | ||
5b7ac358 MD |
49 | enum sc_type { |
50 | SC_TYPE_ENTRY, | |
51 | SC_TYPE_EXIT, | |
52 | SC_TYPE_COMPAT_ENTRY, | |
53 | SC_TYPE_COMPAT_EXIT, | |
54 | }; | |
55 | ||
d4291869 MD |
56 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
57 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
58 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
59 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
60 | ||
61 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
62 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
63 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
64 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 65 | |
2d6d88c6 | 66 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
2d6d88c6 | 67 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 68 | |
3a523f5b MD |
69 | /* |
70 | * Forward declarations for old kernels. | |
71 | */ | |
72 | struct mmsghdr; | |
73 | struct rlimit64; | |
74 | struct oldold_utsname; | |
75 | struct old_utsname; | |
76 | struct sel_arg_struct; | |
77 | struct mmap_arg_struct; | |
c0b71117 | 78 | struct file_handle; |
a292e6f1 | 79 | struct user_msghdr; |
7aedbe65 MD |
80 | struct __kernel_old_itimerval; |
81 | struct open_how; | |
82 | struct mount_attr; | |
83 | struct futex_waitv; | |
3a523f5b | 84 | |
9eb15e8b MJ |
85 | /* |
86 | * Forward declaration for kernels >= 5.6 | |
87 | */ | |
88 | struct timex; | |
edfdcb68 MJ |
89 | struct timeval; |
90 | struct itimerval; | |
91 | struct itimerspec; | |
92 | ||
5f4c791e | 93 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
94 | typedef __kernel_old_time_t time_t; |
95 | #endif | |
9eb15e8b | 96 | |
80f87dd2 MD |
97 | #ifdef IA32_NR_syscalls |
98 | #define NR_compat_syscalls IA32_NR_syscalls | |
99 | #else | |
100 | #define NR_compat_syscalls NR_syscalls | |
101 | #endif | |
102 | ||
259b6cb3 MD |
103 | /* |
104 | * Create LTTng tracepoint probes. | |
105 | */ | |
106 | #define LTTNG_PACKAGE_BUILD | |
107 | #define CREATE_TRACE_POINTS | |
2655f9ad | 108 | #define TP_MODULE_NOINIT |
c075712b | 109 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 110 | |
a93244f8 MD |
111 | #define PARAMS(args...) args |
112 | ||
5b7ac358 | 113 | /* Handle unknown syscalls */ |
72a52753 | 114 | #undef TRACE_SYSTEM |
5b7ac358 | 115 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 116 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
117 | #undef TRACE_SYSTEM |
118 | ||
5b7ac358 | 119 | #undef TP_PROBE_CB |
fc4f7161 | 120 | |
e42c4f49 FD |
121 | extern const struct trace_syscall_table sc_table; |
122 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 123 | |
2d6d88c6 | 124 | /* Event syscall exit table */ |
e42c4f49 FD |
125 | extern const struct trace_syscall_table sc_exit_table; |
126 | extern const struct trace_syscall_table compat_sc_exit_table; | |
ebcc64cd FD |
127 | |
128 | ||
fc4f7161 MD |
129 | #undef SC_EXIT |
130 | ||
a93244f8 | 131 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 132 | |
80f87dd2 | 133 | struct lttng_syscall_filter { |
badfe9f5 MD |
134 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
135 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
136 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
137 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
7f52f0d4 MD |
138 | |
139 | /* | |
140 | * Reference counters keeping track of number of events enabled | |
141 | * for each bit. | |
142 | */ | |
143 | u32 sc_entry_refcount_map[NR_syscalls]; | |
144 | u32 sc_exit_refcount_map[NR_syscalls]; | |
145 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
146 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
147 | }; |
148 | ||
3b82c4e1 | 149 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 150 | struct pt_regs *regs, long id) |
f405cfce | 151 | { |
1b7b9c65 | 152 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 153 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 154 | |
1b7b9c65 | 155 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 156 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 157 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 158 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 159 | else |
e2d5dbc7 | 160 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
161 | } |
162 | } | |
163 | ||
63aa9160 | 164 | static __always_inline |
e2d5dbc7 | 165 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 166 | void *func, unsigned int nrargs, |
63aa9160 | 167 | struct pt_regs *regs) |
259b6cb3 | 168 | { |
a67ba386 | 169 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 170 | |
63aa9160 | 171 | switch (nrargs) { |
259b6cb3 MD |
172 | case 0: |
173 | { | |
63aa9160 | 174 | void (*fptr)(void *__data) = func; |
259b6cb3 | 175 | |
e2d5dbc7 MD |
176 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
177 | fptr(event_priv->pub); | |
259b6cb3 MD |
178 | break; |
179 | } | |
180 | case 1: | |
181 | { | |
63aa9160 | 182 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 183 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 184 | |
1b7b9c65 | 185 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
186 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
187 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
188 | break; |
189 | } | |
190 | case 2: | |
191 | { | |
192 | void (*fptr)(void *__data, | |
193 | unsigned long arg0, | |
63aa9160 | 194 | unsigned long arg1) = func; |
1b7b9c65 | 195 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 196 | |
1b7b9c65 | 197 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
198 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
199 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
200 | break; |
201 | } | |
202 | case 3: | |
203 | { | |
204 | void (*fptr)(void *__data, | |
205 | unsigned long arg0, | |
206 | unsigned long arg1, | |
63aa9160 | 207 | unsigned long arg2) = func; |
1b7b9c65 | 208 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 209 | |
1b7b9c65 | 210 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
211 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
212 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
213 | break; |
214 | } | |
215 | case 4: | |
216 | { | |
217 | void (*fptr)(void *__data, | |
218 | unsigned long arg0, | |
219 | unsigned long arg1, | |
220 | unsigned long arg2, | |
63aa9160 | 221 | unsigned long arg3) = func; |
1b7b9c65 | 222 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 223 | |
1b7b9c65 | 224 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
225 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
226 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
227 | break; |
228 | } | |
229 | case 5: | |
230 | { | |
231 | void (*fptr)(void *__data, | |
232 | unsigned long arg0, | |
233 | unsigned long arg1, | |
234 | unsigned long arg2, | |
235 | unsigned long arg3, | |
63aa9160 | 236 | unsigned long arg4) = func; |
1b7b9c65 | 237 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 238 | |
1b7b9c65 | 239 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
240 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
241 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
242 | break; |
243 | } | |
244 | case 6: | |
245 | { | |
246 | void (*fptr)(void *__data, | |
247 | unsigned long arg0, | |
248 | unsigned long arg1, | |
249 | unsigned long arg2, | |
250 | unsigned long arg3, | |
251 | unsigned long arg4, | |
63aa9160 | 252 | unsigned long arg5) = func; |
1b7b9c65 | 253 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 254 | |
1b7b9c65 | 255 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
256 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
257 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 258 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
259 | break; |
260 | } | |
261 | default: | |
262 | break; | |
263 | } | |
264 | } | |
265 | ||
63aa9160 FD |
266 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
267 | { | |
0bb716a8 | 268 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 269 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
270 | const struct trace_syscall_entry *table, *entry; |
271 | size_t table_len; | |
272 | ||
273 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 274 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
275 | |
276 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 277 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
278 | /* System call filtered out. */ |
279 | return; | |
280 | } | |
ebcc64cd FD |
281 | table = compat_sc_table.table; |
282 | table_len = compat_sc_table.len; | |
0bb716a8 | 283 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 284 | } else { |
0bb716a8 | 285 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
286 | |
287 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 288 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
289 | /* System call filtered out. */ |
290 | return; | |
291 | } | |
ebcc64cd FD |
292 | table = sc_table.table; |
293 | table_len = sc_table.len; | |
0bb716a8 | 294 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
295 | } |
296 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 297 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
298 | return; |
299 | } | |
3b82c4e1 MD |
300 | |
301 | entry = &table[id]; | |
302 | if (!entry->event_func) { | |
303 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
304 | return; |
305 | } | |
3b82c4e1 MD |
306 | |
307 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 308 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 309 | } else { |
0bb716a8 | 310 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
311 | } |
312 | if (unlikely(hlist_empty(action_list))) | |
313 | return; | |
314 | ||
e2d5dbc7 | 315 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
316 | } |
317 | ||
3b82c4e1 | 318 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 319 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 320 | { |
1b7b9c65 | 321 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 322 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 323 | |
1b7b9c65 | 324 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 325 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 326 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 327 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
328 | args); |
329 | else | |
e2d5dbc7 | 330 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 331 | } |
5b7ac358 MD |
332 | } |
333 | ||
3b82c4e1 | 334 | static __always_inline |
e2d5dbc7 | 335 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
336 | void *func, unsigned int nrargs, |
337 | struct pt_regs *regs, long ret) | |
5b7ac358 | 338 | { |
a67ba386 | 339 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 340 | |
3b82c4e1 | 341 | switch (nrargs) { |
5b7ac358 MD |
342 | case 0: |
343 | { | |
3b82c4e1 | 344 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 345 | |
e2d5dbc7 MD |
346 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
347 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
348 | break; |
349 | } | |
350 | case 1: | |
351 | { | |
352 | void (*fptr)(void *__data, | |
fc4f7161 | 353 | long ret, |
3b82c4e1 | 354 | unsigned long arg0) = func; |
1b7b9c65 | 355 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 356 | |
1b7b9c65 | 357 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
358 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
359 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
360 | break; |
361 | } | |
362 | case 2: | |
363 | { | |
364 | void (*fptr)(void *__data, | |
fc4f7161 | 365 | long ret, |
5b7ac358 | 366 | unsigned long arg0, |
3b82c4e1 | 367 | unsigned long arg1) = func; |
1b7b9c65 | 368 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 369 | |
1b7b9c65 | 370 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
371 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
372 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
373 | break; |
374 | } | |
375 | case 3: | |
376 | { | |
377 | void (*fptr)(void *__data, | |
fc4f7161 | 378 | long ret, |
5b7ac358 MD |
379 | unsigned long arg0, |
380 | unsigned long arg1, | |
3b82c4e1 | 381 | unsigned long arg2) = func; |
1b7b9c65 | 382 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 383 | |
1b7b9c65 | 384 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
385 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
386 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
387 | break; |
388 | } | |
389 | case 4: | |
390 | { | |
391 | void (*fptr)(void *__data, | |
fc4f7161 | 392 | long ret, |
5b7ac358 MD |
393 | unsigned long arg0, |
394 | unsigned long arg1, | |
395 | unsigned long arg2, | |
3b82c4e1 | 396 | unsigned long arg3) = func; |
1b7b9c65 | 397 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 398 | |
1b7b9c65 | 399 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
400 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
401 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
402 | break; |
403 | } | |
404 | case 5: | |
405 | { | |
406 | void (*fptr)(void *__data, | |
fc4f7161 | 407 | long ret, |
5b7ac358 MD |
408 | unsigned long arg0, |
409 | unsigned long arg1, | |
410 | unsigned long arg2, | |
411 | unsigned long arg3, | |
3b82c4e1 | 412 | unsigned long arg4) = func; |
1b7b9c65 | 413 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 414 | |
1b7b9c65 | 415 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
416 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
417 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
418 | break; |
419 | } | |
420 | case 6: | |
421 | { | |
422 | void (*fptr)(void *__data, | |
fc4f7161 | 423 | long ret, |
5b7ac358 MD |
424 | unsigned long arg0, |
425 | unsigned long arg1, | |
426 | unsigned long arg2, | |
427 | unsigned long arg3, | |
428 | unsigned long arg4, | |
3b82c4e1 | 429 | unsigned long arg5) = func; |
1b7b9c65 | 430 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 431 | |
1b7b9c65 | 432 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
433 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
434 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 435 | args[3], args[4], args[5]); |
5b7ac358 MD |
436 | break; |
437 | } | |
438 | default: | |
439 | break; | |
440 | } | |
441 | } | |
442 | ||
3b82c4e1 MD |
443 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
444 | { | |
0bb716a8 | 445 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
446 | struct hlist_head *action_list, *unknown_action_list; |
447 | const struct trace_syscall_entry *table, *entry; | |
448 | size_t table_len; | |
449 | long id; | |
450 | ||
451 | id = syscall_get_nr(current, regs); | |
452 | ||
453 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 454 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
455 | |
456 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 457 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
458 | /* System call filtered out. */ |
459 | return; | |
460 | } | |
ebcc64cd FD |
461 | table = compat_sc_exit_table.table; |
462 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 463 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 464 | } else { |
0bb716a8 | 465 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
466 | |
467 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 468 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
469 | /* System call filtered out. */ |
470 | return; | |
471 | } | |
ebcc64cd FD |
472 | table = sc_exit_table.table; |
473 | table_len = sc_exit_table.len; | |
0bb716a8 | 474 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
475 | } |
476 | if (unlikely(id < 0 || id >= table_len)) { | |
477 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
478 | return; | |
479 | } | |
480 | ||
481 | entry = &table[id]; | |
482 | if (!entry->event_func) { | |
483 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
484 | return; | |
485 | } | |
486 | ||
487 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 488 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 489 | } else { |
0bb716a8 | 490 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
491 | } |
492 | if (unlikely(hlist_empty(action_list))) | |
493 | return; | |
494 | ||
e2d5dbc7 | 495 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
496 | regs, ret); |
497 | } | |
498 | ||
0bb716a8 MD |
499 | static |
500 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 501 | { |
0bb716a8 MD |
502 | switch (event_enabler->enabler_type) { |
503 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
504 | { | |
1ae083ba MD |
505 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
506 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 507 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 508 | } |
0bb716a8 MD |
509 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
510 | { | |
511 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
512 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
513 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 514 | } |
0bb716a8 MD |
515 | default: |
516 | return NULL; | |
8a8ac9a8 | 517 | } |
0bb716a8 | 518 | } |
8a8ac9a8 | 519 | |
0bb716a8 MD |
520 | static |
521 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
522 | { | |
523 | switch (event->type) { | |
524 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
525 | { | |
526 | struct lttng_kernel_event_recorder *event_recorder = | |
527 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
528 | return &event_recorder->chan->priv->parent.syscall_table; | |
529 | } | |
530 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
531 | { | |
532 | struct lttng_kernel_event_notifier *event_notifier = | |
533 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
534 | return &event_notifier->priv->group->syscall_table; | |
535 | } | |
536 | default: | |
537 | return NULL; | |
8a8ac9a8 | 538 | } |
8a8ac9a8 | 539 | } |
0bb716a8 | 540 | |
5408b6d6 MD |
541 | static |
542 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
99903379 | 543 | const struct lttng_kernel_event_desc *desc, enum sc_type type, unsigned int syscall_nr) |
5408b6d6 MD |
544 | { |
545 | struct lttng_kernel_event_common *event; | |
546 | ||
547 | switch (syscall_event_enabler->enabler_type) { | |
548 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
549 | { | |
550 | struct lttng_event_recorder_enabler *syscall_event_recorder_enabler = | |
551 | container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
552 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
553 | struct lttng_kernel_abi_event ev; | |
554 | ||
555 | /* We need to create an event for this syscall/enabler. */ | |
556 | memset(&ev, 0, sizeof(ev)); | |
557 | switch (type) { | |
558 | case SC_TYPE_ENTRY: | |
559 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
560 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
561 | break; | |
562 | case SC_TYPE_EXIT: | |
563 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
564 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
565 | break; | |
566 | case SC_TYPE_COMPAT_ENTRY: | |
567 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
568 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
569 | break; | |
570 | case SC_TYPE_COMPAT_EXIT: | |
571 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
572 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
573 | break; | |
574 | } | |
575 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); | |
576 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
577 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
578 | event_recorder_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, | |
579 | syscall_event_recorder_enabler->chan); | |
580 | WARN_ON_ONCE(!event_recorder_enabler); | |
581 | if (!event_recorder_enabler) | |
582 | return; | |
583 | event = _lttng_kernel_event_create(&event_recorder_enabler->parent, desc); | |
c3fb484e | 584 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 585 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
c3fb484e | 586 | if (IS_ERR(event)) { |
5408b6d6 MD |
587 | printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name); |
588 | return; | |
589 | } | |
9cd106a6 | 590 | event->priv->u.syscall.syscall_id = syscall_nr; |
5408b6d6 MD |
591 | break; |
592 | } | |
593 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
594 | { | |
595 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
596 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
597 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
598 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
599 | uint64_t user_token = syscall_event_enabler->user_token; | |
600 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
601 | ||
602 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
603 | switch (type) { | |
604 | case SC_TYPE_ENTRY: | |
605 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
606 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
607 | break; | |
608 | case SC_TYPE_EXIT: | |
609 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
610 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
611 | break; | |
612 | case SC_TYPE_COMPAT_ENTRY: | |
613 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
614 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
615 | break; | |
616 | case SC_TYPE_COMPAT_EXIT: | |
617 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
618 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
619 | break; | |
620 | } | |
621 | strncat(event_notifier_param.event.name, desc->event_name, | |
622 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
623 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
624 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
625 | event_notifier_param.event.token = user_token; | |
626 | event_notifier_param.error_counter_index = error_counter_index; | |
627 | ||
628 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
629 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
630 | WARN_ON_ONCE(!event_notifier_enabler); | |
631 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); | |
c3fb484e | 632 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 633 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 634 | if (IS_ERR(event)) { |
5408b6d6 MD |
635 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
636 | return; | |
637 | } | |
638 | event->priv->u.syscall.syscall_id = syscall_nr; | |
639 | break; | |
640 | } | |
641 | default: | |
642 | break; | |
643 | } | |
644 | } | |
645 | ||
49c50022 | 646 | static |
67233a18 MD |
647 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
648 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 649 | { |
063f0825 MD |
650 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common); |
651 | const struct lttng_kernel_event_desc *desc; | |
259b6cb3 | 652 | unsigned int i; |
49c50022 | 653 | |
1d303f69 MD |
654 | #ifndef CONFIG_COMPAT |
655 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 656 | return; |
1d303f69 | 657 | #endif |
67233a18 | 658 | /* iterate over all syscall and create event that match */ |
49c50022 | 659 | for (i = 0; i < table_len; i++) { |
19bef247 | 660 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 661 | struct hlist_head *head; |
6768203a | 662 | bool found = false; |
49c50022 | 663 | |
063f0825 | 664 | desc = table[i].desc; |
49c50022 MD |
665 | if (!desc) { |
666 | /* Unknown syscall */ | |
667 | continue; | |
668 | } | |
063f0825 MD |
669 | |
670 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 671 | continue; |
063f0825 | 672 | |
49c50022 | 673 | /* |
3b82c4e1 | 674 | * Check if already created. |
49c50022 | 675 | */ |
0def9170 | 676 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 677 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
6768203a MD |
678 | if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) { |
679 | found = true; | |
680 | break; | |
681 | } | |
3b82c4e1 MD |
682 | } |
683 | if (found) | |
49c50022 | 684 | continue; |
3b82c4e1 | 685 | |
99903379 | 686 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, type, i); |
49c50022 | 687 | } |
49c50022 MD |
688 | } |
689 | ||
552f7c79 MD |
690 | static |
691 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
692 | { | |
693 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
694 | return false; | |
695 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
696 | return false; | |
697 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
698 | return false; | |
699 | if (strcmp(event_enabler->event_param.name, "*")) | |
700 | return false; | |
701 | return true; | |
702 | } | |
703 | ||
9f6f4507 MD |
704 | static |
705 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
706 | { | |
9f6f4507 MD |
707 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
708 | struct lttng_kernel_event_common_private *event_priv; | |
709 | const struct lttng_kernel_event_desc *desc; | |
9f6f4507 MD |
710 | bool found = false; |
711 | struct hlist_head *head; | |
712 | ||
1d303f69 MD |
713 | #ifndef CONFIG_COMPAT |
714 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 715 | return; |
1d303f69 | 716 | #endif |
552f7c79 MD |
717 | /* |
718 | * Considering that currently system calls can only be enabled on a per | |
719 | * name basis (or wildcard based on a name), unknown syscall events are | |
720 | * only used when matching *all* system calls, because this is the only | |
721 | * case which can be associated with an unknown system call. | |
722 | * | |
723 | * When enabling system call on a per system call number basis will be | |
724 | * supported, this will need to be revisited. | |
725 | */ | |
726 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
727 | return; | |
728 | ||
9f6f4507 MD |
729 | switch (type) { |
730 | case SC_TYPE_ENTRY: | |
731 | desc = &__event_desc___syscall_entry_unknown; | |
9f6f4507 MD |
732 | break; |
733 | case SC_TYPE_EXIT: | |
734 | desc = &__event_desc___syscall_exit_unknown; | |
9f6f4507 MD |
735 | break; |
736 | case SC_TYPE_COMPAT_ENTRY: | |
737 | desc = &__event_desc___compat_syscall_entry_unknown; | |
9f6f4507 MD |
738 | break; |
739 | case SC_TYPE_COMPAT_EXIT: | |
740 | desc = &__event_desc___compat_syscall_exit_unknown; | |
9f6f4507 MD |
741 | break; |
742 | default: | |
743 | WARN_ON_ONCE(1); | |
744 | } | |
745 | ||
746 | /* | |
747 | * Check if already created. | |
748 | */ | |
749 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); | |
750 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { | |
6768203a | 751 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
9f6f4507 | 752 | found = true; |
6768203a MD |
753 | break; |
754 | } | |
9f6f4507 MD |
755 | } |
756 | if (!found) | |
99903379 | 757 | lttng_syscall_event_enabler_create_event(event_enabler, desc, type, -1U); |
9f6f4507 MD |
758 | } |
759 | ||
d26015f6 | 760 | static |
15a00134 | 761 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 762 | { |
15a00134 | 763 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 764 | |
15a00134 MD |
765 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
766 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
767 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
768 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
769 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
770 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
771 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
772 | } | |
1ab4126a | 773 | |
15a00134 MD |
774 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
775 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
776 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
777 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
778 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
779 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
780 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
781 | } | |
259b6cb3 MD |
782 | } |
783 | ||
784 | /* | |
8a8ac9a8 FD |
785 | * Should be called with sessions lock held. |
786 | */ | |
b2f63bde | 787 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 788 | { |
d26015f6 MD |
789 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
790 | int ret; | |
8a8ac9a8 | 791 | |
0bb716a8 | 792 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 793 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
794 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
795 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 796 | return -ENOMEM; |
8a8ac9a8 | 797 | } |
0bb716a8 | 798 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
799 | /* create syscall table mapping syscall to events */ |
800 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 801 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 802 | return -ENOMEM; |
8a8ac9a8 FD |
803 | } |
804 | ||
805 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 806 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 807 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
808 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
809 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 810 | return -ENOMEM; |
8a8ac9a8 FD |
811 | } |
812 | ||
0bb716a8 | 813 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
814 | /* create syscall table mapping compat syscall to events */ |
815 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 816 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 817 | return -ENOMEM; |
8a8ac9a8 FD |
818 | } |
819 | #endif | |
0bb716a8 MD |
820 | if (!syscall_table->sc_filter) { |
821 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 822 | GFP_KERNEL); |
0bb716a8 | 823 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
824 | return -ENOMEM; |
825 | } | |
826 | ||
0bb716a8 | 827 | if (!syscall_table->sys_enter_registered) { |
8a8ac9a8 | 828 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 829 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
830 | if (ret) |
831 | return ret; | |
0bb716a8 | 832 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 833 | } |
0bb716a8 | 834 | if (!syscall_table->sys_exit_registered) { |
8a8ac9a8 | 835 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 836 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 FD |
837 | if (ret) { |
838 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 839 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
840 | return ret; |
841 | } | |
0bb716a8 | 842 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 843 | } |
0fab709d | 844 | |
86e12a51 MD |
845 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
846 | ||
fad51c94 | 847 | return 0; |
8a8ac9a8 FD |
848 | } |
849 | ||
6053e75e | 850 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
851 | { |
852 | int ret; | |
853 | ||
0bb716a8 | 854 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 855 | return 0; |
0bb716a8 | 856 | if (syscall_table->sys_enter_registered) { |
2d9cd7f3 | 857 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 858 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
859 | if (ret) |
860 | return ret; | |
0bb716a8 | 861 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 862 | } |
0bb716a8 | 863 | if (syscall_table->sys_exit_registered) { |
2d9cd7f3 | 864 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 865 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
866 | if (ret) |
867 | return ret; | |
0bb716a8 | 868 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 869 | } |
badfe9f5 MD |
870 | return 0; |
871 | } | |
872 | ||
6053e75e | 873 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 874 | { |
0bb716a8 MD |
875 | kfree(syscall_table->syscall_dispatch); |
876 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 877 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
878 | kfree(syscall_table->compat_syscall_dispatch); |
879 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 880 | #endif |
0bb716a8 | 881 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
882 | return 0; |
883 | } | |
884 | ||
12e579db MD |
885 | static |
886 | uint32_t get_sc_tables_len(void) | |
887 | { | |
ebcc64cd | 888 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
889 | } |
890 | ||
badfe9f5 | 891 | static |
ade8a729 FD |
892 | const char *get_syscall_name(const char *desc_name, |
893 | enum lttng_syscall_abi abi, | |
894 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 895 | { |
badfe9f5 | 896 | size_t prefix_len = 0; |
80f87dd2 | 897 | |
80f87dd2 | 898 | |
ade8a729 | 899 | switch (entryexit) { |
badfe9f5 | 900 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 901 | switch (abi) { |
badfe9f5 MD |
902 | case LTTNG_SYSCALL_ABI_NATIVE: |
903 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
904 | break; | |
905 | case LTTNG_SYSCALL_ABI_COMPAT: | |
906 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
907 | break; | |
80f87dd2 | 908 | } |
badfe9f5 MD |
909 | break; |
910 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 911 | switch (abi) { |
badfe9f5 MD |
912 | case LTTNG_SYSCALL_ABI_NATIVE: |
913 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
914 | break; | |
915 | case LTTNG_SYSCALL_ABI_COMPAT: | |
916 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
917 | break; | |
80f87dd2 | 918 | } |
badfe9f5 | 919 | break; |
80f87dd2 | 920 | } |
badfe9f5 | 921 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 922 | return desc_name + prefix_len; |
badfe9f5 MD |
923 | } |
924 | ||
ade8a729 FD |
925 | static |
926 | int lttng_syscall_filter_enable( | |
927 | struct lttng_syscall_filter *filter, | |
928 | const char *desc_name, enum lttng_syscall_abi abi, | |
99903379 MD |
929 | enum lttng_syscall_entryexit entryexit, |
930 | unsigned int syscall_id) | |
badfe9f5 | 931 | { |
badfe9f5 MD |
932 | const char *syscall_name; |
933 | unsigned long *bitmap; | |
7f52f0d4 | 934 | u32 *refcount_map; |
badfe9f5 | 935 | |
ade8a729 | 936 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 937 | |
ade8a729 | 938 | switch (entryexit) { |
badfe9f5 | 939 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 940 | switch (abi) { |
badfe9f5 MD |
941 | case LTTNG_SYSCALL_ABI_NATIVE: |
942 | bitmap = filter->sc_entry; | |
7f52f0d4 | 943 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
944 | break; |
945 | case LTTNG_SYSCALL_ABI_COMPAT: | |
946 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 947 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 948 | break; |
6d9694d8 MD |
949 | default: |
950 | return -EINVAL; | |
80f87dd2 | 951 | } |
badfe9f5 MD |
952 | break; |
953 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 954 | switch (abi) { |
badfe9f5 MD |
955 | case LTTNG_SYSCALL_ABI_NATIVE: |
956 | bitmap = filter->sc_exit; | |
7f52f0d4 | 957 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
958 | break; |
959 | case LTTNG_SYSCALL_ABI_COMPAT: | |
960 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 961 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 962 | break; |
6d9694d8 MD |
963 | default: |
964 | return -EINVAL; | |
80f87dd2 | 965 | } |
badfe9f5 MD |
966 | break; |
967 | default: | |
968 | return -EINVAL; | |
80f87dd2 | 969 | } |
99903379 | 970 | if (refcount_map[syscall_id] == U32_MAX) |
7f52f0d4 | 971 | return -EOVERFLOW; |
99903379 MD |
972 | if (refcount_map[syscall_id]++ == 0) |
973 | bitmap_set(bitmap, syscall_id, 1); | |
80f87dd2 | 974 | return 0; |
80f87dd2 MD |
975 | } |
976 | ||
9b2f1c54 | 977 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 978 | { |
9b2f1c54 | 979 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
980 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
981 | struct hlist_head *dispatch_list; | |
ca62543e | 982 | int ret = 0; |
8a8ac9a8 | 983 | |
9b2f1c54 | 984 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 985 | |
99903379 MD |
986 | /* Unknown syscall */ |
987 | if (syscall_id == -1U) { | |
988 | switch (event->priv->u.syscall.entryexit) { | |
989 | case LTTNG_SYSCALL_ENTRY: | |
990 | switch (event->priv->u.syscall.abi) { | |
991 | case LTTNG_SYSCALL_ABI_NATIVE: | |
992 | dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
993 | break; | |
994 | case LTTNG_SYSCALL_ABI_COMPAT: | |
995 | dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
996 | break; | |
997 | default: | |
998 | ret = -EINVAL; | |
999 | goto end; | |
1000 | } | |
9cd106a6 | 1001 | break; |
99903379 MD |
1002 | case LTTNG_SYSCALL_EXIT: |
1003 | switch (event->priv->u.syscall.abi) { | |
1004 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1005 | dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
1006 | break; | |
1007 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1008 | dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
1009 | break; | |
1010 | default: | |
1011 | ret = -EINVAL; | |
1012 | goto end; | |
1013 | } | |
9cd106a6 MD |
1014 | break; |
1015 | default: | |
1016 | ret = -EINVAL; | |
1017 | goto end; | |
1018 | } | |
99903379 MD |
1019 | } else { |
1020 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, | |
1021 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1022 | event->priv->u.syscall.entryexit, syscall_id); | |
1023 | if (ret) | |
1024 | return ret; | |
1025 | ||
1026 | switch (event->priv->u.syscall.entryexit) { | |
1027 | case LTTNG_SYSCALL_ENTRY: | |
1028 | switch (event->priv->u.syscall.abi) { | |
1029 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1030 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1031 | break; | |
1032 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1033 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1034 | break; | |
1035 | default: | |
1036 | ret = -EINVAL; | |
1037 | goto end; | |
1038 | } | |
8a8ac9a8 | 1039 | break; |
99903379 MD |
1040 | case LTTNG_SYSCALL_EXIT: |
1041 | switch (event->priv->u.syscall.abi) { | |
1042 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1043 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1044 | break; | |
1045 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1046 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1047 | break; | |
1048 | default: | |
1049 | ret = -EINVAL; | |
1050 | goto end; | |
1051 | } | |
8a8ac9a8 | 1052 | break; |
6866b1c7 MJ |
1053 | default: |
1054 | ret = -EINVAL; | |
1055 | goto end; | |
8a8ac9a8 | 1056 | } |
8a8ac9a8 | 1057 | } |
9cd106a6 MD |
1058 | |
1059 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1060 | end: |
9b2f1c54 | 1061 | return ret; |
ade8a729 FD |
1062 | } |
1063 | ||
1064 | static | |
f2db8be3 | 1065 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 | 1066 | const char *desc_name, enum lttng_syscall_abi abi, |
99903379 MD |
1067 | enum lttng_syscall_entryexit entryexit, |
1068 | unsigned int syscall_id) | |
ade8a729 | 1069 | { |
badfe9f5 MD |
1070 | const char *syscall_name; |
1071 | unsigned long *bitmap; | |
7f52f0d4 | 1072 | u32 *refcount_map; |
80f87dd2 | 1073 | |
ade8a729 | 1074 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1075 | |
ade8a729 | 1076 | switch (entryexit) { |
badfe9f5 | 1077 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1078 | switch (abi) { |
badfe9f5 MD |
1079 | case LTTNG_SYSCALL_ABI_NATIVE: |
1080 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1081 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1082 | break; |
1083 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1084 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1085 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1086 | break; |
6d9694d8 MD |
1087 | default: |
1088 | return -EINVAL; | |
80f87dd2 | 1089 | } |
badfe9f5 MD |
1090 | break; |
1091 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1092 | switch (abi) { |
badfe9f5 MD |
1093 | case LTTNG_SYSCALL_ABI_NATIVE: |
1094 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1095 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1096 | break; |
1097 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1098 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1099 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1100 | break; |
6d9694d8 MD |
1101 | default: |
1102 | return -EINVAL; | |
80f87dd2 | 1103 | } |
badfe9f5 MD |
1104 | break; |
1105 | default: | |
1106 | return -EINVAL; | |
80f87dd2 | 1107 | } |
99903379 | 1108 | if (refcount_map[syscall_id] == 0) |
7f52f0d4 | 1109 | return -ENOENT; |
99903379 MD |
1110 | if (--refcount_map[syscall_id] == 0) |
1111 | bitmap_clear(bitmap, syscall_id, 1); | |
badfe9f5 | 1112 | return 0; |
259b6cb3 | 1113 | } |
2d2464bd | 1114 | |
9b2f1c54 | 1115 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1116 | { |
9b2f1c54 | 1117 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
7f52f0d4 | 1118 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
8a8ac9a8 FD |
1119 | int ret; |
1120 | ||
99903379 MD |
1121 | /* Except for unknown syscall */ |
1122 | if (syscall_id != -1U) { | |
1123 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, | |
1124 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1125 | event->priv->u.syscall.entryexit, syscall_id); | |
1126 | if (ret) | |
1127 | return ret; | |
1128 | } | |
9cd106a6 | 1129 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1130 | return 0; |
1131 | } | |
1132 | ||
9cb5be7e MD |
1133 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1134 | { | |
1135 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1136 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1137 | int enabled = event_enabler->enabled; | |
1138 | ||
552f7c79 | 1139 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1140 | return; |
9cb5be7e MD |
1141 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1142 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1143 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1144 | ||
1145 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1146 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1147 | } | |
1148 | ||
2d2464bd MD |
1149 | static |
1150 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1151 | { | |
1152 | const struct trace_syscall_entry *entry; | |
1153 | int iter = 0; | |
1154 | ||
ebcc64cd FD |
1155 | for (entry = sc_table.table; |
1156 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1157 | entry++) { |
1158 | if (iter++ >= *pos) | |
1159 | return entry; | |
1160 | } | |
ebcc64cd FD |
1161 | for (entry = compat_sc_table.table; |
1162 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1163 | entry++) { |
1164 | if (iter++ >= *pos) | |
1165 | return entry; | |
1166 | } | |
1167 | /* End of list */ | |
1168 | return NULL; | |
1169 | } | |
1170 | ||
1171 | static | |
1172 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1173 | { | |
1174 | return (void *) syscall_list_get_entry(pos); | |
1175 | } | |
1176 | ||
1177 | static | |
1178 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1179 | { | |
1180 | (*ppos)++; | |
1181 | return (void *) syscall_list_get_entry(ppos); | |
1182 | } | |
1183 | ||
1184 | static | |
1185 | void syscall_list_stop(struct seq_file *m, void *p) | |
1186 | { | |
1187 | } | |
1188 | ||
12e579db MD |
1189 | static |
1190 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1191 | const struct trace_syscall_entry **table, | |
1192 | unsigned int *bitness) | |
1193 | { | |
ebcc64cd | 1194 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1195 | if (bitness) |
1196 | *bitness = BITS_PER_LONG; | |
1197 | if (table) | |
ebcc64cd | 1198 | *table = sc_table.table; |
12e579db MD |
1199 | return 0; |
1200 | } | |
ebcc64cd FD |
1201 | if (!(entry >= compat_sc_table.table |
1202 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1203 | return -EINVAL; |
1204 | } | |
1205 | if (bitness) | |
1206 | *bitness = 32; | |
1207 | if (table) | |
ebcc64cd | 1208 | *table = compat_sc_table.table; |
12e579db MD |
1209 | return 0; |
1210 | } | |
1211 | ||
2d2464bd MD |
1212 | static |
1213 | int syscall_list_show(struct seq_file *m, void *p) | |
1214 | { | |
1215 | const struct trace_syscall_entry *table, *entry = p; | |
1216 | unsigned int bitness; | |
d4291869 | 1217 | unsigned long index; |
12e579db | 1218 | int ret; |
d4291869 | 1219 | const char *name; |
2d2464bd | 1220 | |
12e579db MD |
1221 | ret = get_sc_table(entry, &table, &bitness); |
1222 | if (ret) | |
1223 | return ret; | |
f4855b46 MD |
1224 | if (!entry->desc) |
1225 | return 0; | |
ebcc64cd | 1226 | if (table == sc_table.table) { |
d4291869 | 1227 | index = entry - table; |
437d5aa5 | 1228 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1229 | } else { |
ebcc64cd | 1230 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1231 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1232 | } |
12e579db | 1233 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1234 | index, name, bitness); |
2d2464bd MD |
1235 | return 0; |
1236 | } | |
1237 | ||
1238 | static | |
1239 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1240 | .start = syscall_list_start, | |
1241 | .next = syscall_list_next, | |
1242 | .stop = syscall_list_stop, | |
1243 | .show = syscall_list_show, | |
1244 | }; | |
1245 | ||
1246 | static | |
1247 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1248 | { | |
1249 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1250 | } | |
1251 | ||
1252 | const struct file_operations lttng_syscall_list_fops = { | |
1253 | .owner = THIS_MODULE, | |
1254 | .open = lttng_syscall_list_open, | |
1255 | .read = seq_read, | |
1256 | .llseek = seq_lseek, | |
1257 | .release = seq_release, | |
1258 | }; | |
12e579db | 1259 | |
badfe9f5 MD |
1260 | /* |
1261 | * A syscall is enabled if it is traced for either entry or exit. | |
1262 | */ | |
c970b655 | 1263 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1264 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1265 | { |
1266 | uint32_t len, sc_tables_len, bitmask_len; | |
1267 | int ret = 0, bit; | |
1268 | char *tmp_mask; | |
1269 | struct lttng_syscall_filter *filter; | |
1270 | ||
1271 | ret = get_user(len, &usyscall_mask->len); | |
1272 | if (ret) | |
1273 | return ret; | |
1274 | sc_tables_len = get_sc_tables_len(); | |
1275 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1276 | if (len < sc_tables_len) { | |
1277 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1278 | } | |
1279 | /* Array is large enough, we can copy array to user-space. */ | |
1280 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1281 | if (!tmp_mask) | |
1282 | return -ENOMEM; | |
0bb716a8 | 1283 | filter = syscall_table->sc_filter; |
12e579db | 1284 | |
ebcc64cd | 1285 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1286 | char state; |
2f25059d | 1287 | |
0bb716a8 MD |
1288 | if (syscall_table->syscall_dispatch) { |
1289 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1290 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1291 | state = test_bit(bit, filter->sc_entry) |
1292 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1293 | else |
1294 | state = 1; | |
1295 | } else { | |
1296 | state = 0; | |
1297 | } | |
1298 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1299 | } |
1300 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1301 | char state; |
2f25059d | 1302 | |
0bb716a8 MD |
1303 | if (syscall_table->compat_syscall_dispatch) { |
1304 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1305 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1306 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1307 | filter->sc_compat_entry) |
ebcc64cd | 1308 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1309 | filter->sc_compat_exit); |
2f25059d MD |
1310 | else |
1311 | state = 1; | |
1312 | } else { | |
1313 | state = 0; | |
1314 | } | |
1315 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1316 | } |
1317 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1318 | ret = -EFAULT; | |
1319 | kfree(tmp_mask); | |
1320 | return ret; | |
1321 | } | |
082d4946 MD |
1322 | |
1323 | int lttng_abi_syscall_list(void) | |
1324 | { | |
1325 | struct file *syscall_list_file; | |
1326 | int file_fd, ret; | |
1327 | ||
4ac10b76 | 1328 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1329 | if (file_fd < 0) { |
1330 | ret = file_fd; | |
1331 | goto fd_error; | |
1332 | } | |
1333 | ||
1334 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1335 | <tng_syscall_list_fops, | |
1336 | NULL, O_RDWR); | |
1337 | if (IS_ERR(syscall_list_file)) { | |
1338 | ret = PTR_ERR(syscall_list_file); | |
1339 | goto file_error; | |
1340 | } | |
1341 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1342 | if (ret < 0) | |
1343 | goto open_error; | |
1344 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1345 | return file_fd; |
1346 | ||
1347 | open_error: | |
1348 | fput(syscall_list_file); | |
1349 | file_error: | |
1350 | put_unused_fd(file_fd); | |
1351 | fd_error: | |
1352 | return ret; | |
1353 | } |