Commit | Line | Data |
---|---|---|
b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
259b6cb3 MD |
3 | * lttng-syscalls.c |
4 | * | |
2faf7d1b | 5 | * LTTng syscall probes. |
259b6cb3 | 6 | * |
886d51a3 | 7 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
259b6cb3 MD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
6333ace3 | 12 | #include <linux/compat.h> |
abc0446a | 13 | #include <linux/err.h> |
80f87dd2 | 14 | #include <linux/bitmap.h> |
7ca580f8 MD |
15 | #include <linux/in.h> |
16 | #include <linux/in6.h> | |
2d2464bd | 17 | #include <linux/seq_file.h> |
d4291869 | 18 | #include <linux/stringify.h> |
082d4946 MD |
19 | #include <linux/file.h> |
20 | #include <linux/anon_inodes.h> | |
c8dfb724 | 21 | #include <linux/fcntl.h> |
3cf55950 | 22 | #include <linux/mman.h> |
259b6cb3 MD |
23 | #include <asm/ptrace.h> |
24 | #include <asm/syscall.h> | |
25 | ||
a071f25d | 26 | #include <lttng/bitfield.h> |
241ae9a8 MD |
27 | #include <wrapper/tracepoint.h> |
28 | #include <wrapper/file.h> | |
29 | #include <wrapper/rcu.h> | |
1b7b9c65 | 30 | #include <wrapper/syscall.h> |
2df37e95 | 31 | #include <lttng/events.h> |
6f156b09 | 32 | #include <lttng/events-internal.h> |
8a8ac9a8 | 33 | #include <lttng/utils.h> |
259b6cb3 | 34 | |
ebcc64cd FD |
35 | #include "lttng-syscalls.h" |
36 | ||
6333ace3 | 37 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
38 | # ifndef is_compat_task |
39 | # define is_compat_task() (0) | |
40 | # endif | |
6333ace3 MD |
41 | #endif |
42 | ||
1aa3298b MD |
43 | /* in_compat_syscall appears in kernel 4.6. */ |
44 | #ifndef in_compat_syscall | |
45 | #define in_compat_syscall() is_compat_task() | |
46 | #endif | |
47 | ||
5b7ac358 MD |
48 | enum sc_type { |
49 | SC_TYPE_ENTRY, | |
50 | SC_TYPE_EXIT, | |
51 | SC_TYPE_COMPAT_ENTRY, | |
52 | SC_TYPE_COMPAT_EXIT, | |
53 | }; | |
54 | ||
d4291869 MD |
55 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
56 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
57 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
58 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
59 | ||
60 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
61 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
62 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
63 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 64 | |
2d6d88c6 | 65 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
2d6d88c6 | 66 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 67 | |
3a523f5b MD |
68 | /* |
69 | * Forward declarations for old kernels. | |
70 | */ | |
71 | struct mmsghdr; | |
72 | struct rlimit64; | |
73 | struct oldold_utsname; | |
74 | struct old_utsname; | |
75 | struct sel_arg_struct; | |
76 | struct mmap_arg_struct; | |
c0b71117 | 77 | struct file_handle; |
a292e6f1 | 78 | struct user_msghdr; |
3a523f5b | 79 | |
9eb15e8b MJ |
80 | /* |
81 | * Forward declaration for kernels >= 5.6 | |
82 | */ | |
83 | struct timex; | |
edfdcb68 MJ |
84 | struct timeval; |
85 | struct itimerval; | |
86 | struct itimerspec; | |
87 | ||
5f4c791e | 88 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
89 | typedef __kernel_old_time_t time_t; |
90 | #endif | |
9eb15e8b | 91 | |
80f87dd2 MD |
92 | #ifdef IA32_NR_syscalls |
93 | #define NR_compat_syscalls IA32_NR_syscalls | |
94 | #else | |
95 | #define NR_compat_syscalls NR_syscalls | |
96 | #endif | |
97 | ||
259b6cb3 MD |
98 | /* |
99 | * Create LTTng tracepoint probes. | |
100 | */ | |
101 | #define LTTNG_PACKAGE_BUILD | |
102 | #define CREATE_TRACE_POINTS | |
2655f9ad | 103 | #define TP_MODULE_NOINIT |
c075712b | 104 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 105 | |
a93244f8 MD |
106 | #define PARAMS(args...) args |
107 | ||
5b7ac358 | 108 | /* Handle unknown syscalls */ |
72a52753 | 109 | #undef TRACE_SYSTEM |
5b7ac358 | 110 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 111 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
112 | #undef TRACE_SYSTEM |
113 | ||
5b7ac358 | 114 | #undef TP_PROBE_CB |
fc4f7161 | 115 | |
e42c4f49 FD |
116 | extern const struct trace_syscall_table sc_table; |
117 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 118 | |
2d6d88c6 | 119 | /* Event syscall exit table */ |
e42c4f49 FD |
120 | extern const struct trace_syscall_table sc_exit_table; |
121 | extern const struct trace_syscall_table compat_sc_exit_table; | |
ebcc64cd FD |
122 | |
123 | ||
fc4f7161 MD |
124 | #undef SC_EXIT |
125 | ||
a93244f8 | 126 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 127 | |
80f87dd2 | 128 | struct lttng_syscall_filter { |
badfe9f5 MD |
129 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
130 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
131 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
132 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
80f87dd2 MD |
133 | }; |
134 | ||
0fab709d MD |
135 | static |
136 | int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common *event_enabler); | |
137 | ||
3b82c4e1 | 138 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 139 | struct pt_regs *regs, long id) |
f405cfce | 140 | { |
1b7b9c65 | 141 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 142 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 143 | |
1b7b9c65 | 144 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 145 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 146 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 147 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 148 | else |
e2d5dbc7 | 149 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
150 | } |
151 | } | |
152 | ||
63aa9160 | 153 | static __always_inline |
e2d5dbc7 | 154 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 155 | void *func, unsigned int nrargs, |
63aa9160 | 156 | struct pt_regs *regs) |
259b6cb3 | 157 | { |
a67ba386 | 158 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 159 | |
63aa9160 | 160 | switch (nrargs) { |
259b6cb3 MD |
161 | case 0: |
162 | { | |
63aa9160 | 163 | void (*fptr)(void *__data) = func; |
259b6cb3 | 164 | |
e2d5dbc7 MD |
165 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
166 | fptr(event_priv->pub); | |
259b6cb3 MD |
167 | break; |
168 | } | |
169 | case 1: | |
170 | { | |
63aa9160 | 171 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 172 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 173 | |
1b7b9c65 | 174 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
175 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
176 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
177 | break; |
178 | } | |
179 | case 2: | |
180 | { | |
181 | void (*fptr)(void *__data, | |
182 | unsigned long arg0, | |
63aa9160 | 183 | unsigned long arg1) = func; |
1b7b9c65 | 184 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 185 | |
1b7b9c65 | 186 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
187 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
188 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
189 | break; |
190 | } | |
191 | case 3: | |
192 | { | |
193 | void (*fptr)(void *__data, | |
194 | unsigned long arg0, | |
195 | unsigned long arg1, | |
63aa9160 | 196 | unsigned long arg2) = func; |
1b7b9c65 | 197 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 198 | |
1b7b9c65 | 199 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
200 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
201 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
202 | break; |
203 | } | |
204 | case 4: | |
205 | { | |
206 | void (*fptr)(void *__data, | |
207 | unsigned long arg0, | |
208 | unsigned long arg1, | |
209 | unsigned long arg2, | |
63aa9160 | 210 | unsigned long arg3) = func; |
1b7b9c65 | 211 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 212 | |
1b7b9c65 | 213 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
214 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
215 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
216 | break; |
217 | } | |
218 | case 5: | |
219 | { | |
220 | void (*fptr)(void *__data, | |
221 | unsigned long arg0, | |
222 | unsigned long arg1, | |
223 | unsigned long arg2, | |
224 | unsigned long arg3, | |
63aa9160 | 225 | unsigned long arg4) = func; |
1b7b9c65 | 226 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 227 | |
1b7b9c65 | 228 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
229 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
230 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
231 | break; |
232 | } | |
233 | case 6: | |
234 | { | |
235 | void (*fptr)(void *__data, | |
236 | unsigned long arg0, | |
237 | unsigned long arg1, | |
238 | unsigned long arg2, | |
239 | unsigned long arg3, | |
240 | unsigned long arg4, | |
63aa9160 | 241 | unsigned long arg5) = func; |
1b7b9c65 | 242 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 243 | |
1b7b9c65 | 244 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
245 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
246 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 247 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
248 | break; |
249 | } | |
250 | default: | |
251 | break; | |
252 | } | |
253 | } | |
254 | ||
63aa9160 FD |
255 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
256 | { | |
0bb716a8 | 257 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 258 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
259 | const struct trace_syscall_entry *table, *entry; |
260 | size_t table_len; | |
261 | ||
262 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 263 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
264 | |
265 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 266 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
267 | /* System call filtered out. */ |
268 | return; | |
269 | } | |
ebcc64cd FD |
270 | table = compat_sc_table.table; |
271 | table_len = compat_sc_table.len; | |
0bb716a8 | 272 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 273 | } else { |
0bb716a8 | 274 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
275 | |
276 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 277 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
278 | /* System call filtered out. */ |
279 | return; | |
280 | } | |
ebcc64cd FD |
281 | table = sc_table.table; |
282 | table_len = sc_table.len; | |
0bb716a8 | 283 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
284 | } |
285 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 286 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
287 | return; |
288 | } | |
3b82c4e1 MD |
289 | |
290 | entry = &table[id]; | |
291 | if (!entry->event_func) { | |
292 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
293 | return; |
294 | } | |
3b82c4e1 MD |
295 | |
296 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 297 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 298 | } else { |
0bb716a8 | 299 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
300 | } |
301 | if (unlikely(hlist_empty(action_list))) | |
302 | return; | |
303 | ||
e2d5dbc7 | 304 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
305 | } |
306 | ||
3b82c4e1 | 307 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 308 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 309 | { |
1b7b9c65 | 310 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 311 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 312 | |
1b7b9c65 | 313 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 314 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 315 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 316 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
317 | args); |
318 | else | |
e2d5dbc7 | 319 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 320 | } |
5b7ac358 MD |
321 | } |
322 | ||
3b82c4e1 | 323 | static __always_inline |
e2d5dbc7 | 324 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
325 | void *func, unsigned int nrargs, |
326 | struct pt_regs *regs, long ret) | |
5b7ac358 | 327 | { |
a67ba386 | 328 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 329 | |
3b82c4e1 | 330 | switch (nrargs) { |
5b7ac358 MD |
331 | case 0: |
332 | { | |
3b82c4e1 | 333 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 334 | |
e2d5dbc7 MD |
335 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
336 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
337 | break; |
338 | } | |
339 | case 1: | |
340 | { | |
341 | void (*fptr)(void *__data, | |
fc4f7161 | 342 | long ret, |
3b82c4e1 | 343 | unsigned long arg0) = func; |
1b7b9c65 | 344 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 345 | |
1b7b9c65 | 346 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
347 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
348 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
349 | break; |
350 | } | |
351 | case 2: | |
352 | { | |
353 | void (*fptr)(void *__data, | |
fc4f7161 | 354 | long ret, |
5b7ac358 | 355 | unsigned long arg0, |
3b82c4e1 | 356 | unsigned long arg1) = func; |
1b7b9c65 | 357 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 358 | |
1b7b9c65 | 359 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
360 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
361 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
362 | break; |
363 | } | |
364 | case 3: | |
365 | { | |
366 | void (*fptr)(void *__data, | |
fc4f7161 | 367 | long ret, |
5b7ac358 MD |
368 | unsigned long arg0, |
369 | unsigned long arg1, | |
3b82c4e1 | 370 | unsigned long arg2) = func; |
1b7b9c65 | 371 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 372 | |
1b7b9c65 | 373 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
374 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
375 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
376 | break; |
377 | } | |
378 | case 4: | |
379 | { | |
380 | void (*fptr)(void *__data, | |
fc4f7161 | 381 | long ret, |
5b7ac358 MD |
382 | unsigned long arg0, |
383 | unsigned long arg1, | |
384 | unsigned long arg2, | |
3b82c4e1 | 385 | unsigned long arg3) = func; |
1b7b9c65 | 386 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 387 | |
1b7b9c65 | 388 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
389 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
390 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
391 | break; |
392 | } | |
393 | case 5: | |
394 | { | |
395 | void (*fptr)(void *__data, | |
fc4f7161 | 396 | long ret, |
5b7ac358 MD |
397 | unsigned long arg0, |
398 | unsigned long arg1, | |
399 | unsigned long arg2, | |
400 | unsigned long arg3, | |
3b82c4e1 | 401 | unsigned long arg4) = func; |
1b7b9c65 | 402 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 403 | |
1b7b9c65 | 404 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
405 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
406 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
407 | break; |
408 | } | |
409 | case 6: | |
410 | { | |
411 | void (*fptr)(void *__data, | |
fc4f7161 | 412 | long ret, |
5b7ac358 MD |
413 | unsigned long arg0, |
414 | unsigned long arg1, | |
415 | unsigned long arg2, | |
416 | unsigned long arg3, | |
417 | unsigned long arg4, | |
3b82c4e1 | 418 | unsigned long arg5) = func; |
1b7b9c65 | 419 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 420 | |
1b7b9c65 | 421 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
422 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
423 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 424 | args[3], args[4], args[5]); |
5b7ac358 MD |
425 | break; |
426 | } | |
427 | default: | |
428 | break; | |
429 | } | |
430 | } | |
431 | ||
3b82c4e1 MD |
432 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
433 | { | |
0bb716a8 | 434 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
435 | struct hlist_head *action_list, *unknown_action_list; |
436 | const struct trace_syscall_entry *table, *entry; | |
437 | size_t table_len; | |
438 | long id; | |
439 | ||
440 | id = syscall_get_nr(current, regs); | |
441 | ||
442 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 443 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
444 | |
445 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 446 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
447 | /* System call filtered out. */ |
448 | return; | |
449 | } | |
ebcc64cd FD |
450 | table = compat_sc_exit_table.table; |
451 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 452 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 453 | } else { |
0bb716a8 | 454 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
455 | |
456 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 457 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
458 | /* System call filtered out. */ |
459 | return; | |
460 | } | |
ebcc64cd FD |
461 | table = sc_exit_table.table; |
462 | table_len = sc_exit_table.len; | |
0bb716a8 | 463 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
464 | } |
465 | if (unlikely(id < 0 || id >= table_len)) { | |
466 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
467 | return; | |
468 | } | |
469 | ||
470 | entry = &table[id]; | |
471 | if (!entry->event_func) { | |
472 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
473 | return; | |
474 | } | |
475 | ||
476 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 477 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 478 | } else { |
0bb716a8 | 479 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
480 | } |
481 | if (unlikely(hlist_empty(action_list))) | |
482 | return; | |
483 | ||
e2d5dbc7 | 484 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
485 | regs, ret); |
486 | } | |
487 | ||
0bb716a8 MD |
488 | static |
489 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 490 | { |
0bb716a8 MD |
491 | switch (event_enabler->enabler_type) { |
492 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
493 | { | |
1ae083ba MD |
494 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
495 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 496 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 497 | } |
0bb716a8 MD |
498 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
499 | { | |
500 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
501 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
502 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 503 | } |
0bb716a8 MD |
504 | default: |
505 | return NULL; | |
8a8ac9a8 | 506 | } |
0bb716a8 | 507 | } |
8a8ac9a8 | 508 | |
0bb716a8 MD |
509 | static |
510 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
511 | { | |
512 | switch (event->type) { | |
513 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
514 | { | |
515 | struct lttng_kernel_event_recorder *event_recorder = | |
516 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
517 | return &event_recorder->chan->priv->parent.syscall_table; | |
518 | } | |
519 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
520 | { | |
521 | struct lttng_kernel_event_notifier *event_notifier = | |
522 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
523 | return &event_notifier->priv->group->syscall_table; | |
524 | } | |
525 | default: | |
526 | return NULL; | |
8a8ac9a8 | 527 | } |
8a8ac9a8 | 528 | } |
0bb716a8 | 529 | |
33a39a3c MD |
530 | /* |
531 | * noinline to diminish caller stack size. | |
532 | * Should be called with sessions lock held. | |
533 | */ | |
49c50022 | 534 | static |
3b82c4e1 | 535 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
1ae083ba | 536 | struct hlist_head *chan_table, struct lttng_event_recorder_enabler *syscall_event_enabler, |
a67ba386 | 537 | enum sc_type type) |
259b6cb3 | 538 | { |
0bb716a8 | 539 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(&syscall_event_enabler->parent); |
def1e304 | 540 | struct lttng_kernel_channel_buffer *chan = syscall_event_enabler->chan; |
f7d06400 | 541 | struct lttng_kernel_session *session = chan->parent.session; |
259b6cb3 | 542 | unsigned int i; |
49c50022 | 543 | |
3b82c4e1 | 544 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 545 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 546 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
1ae083ba | 547 | struct lttng_event_recorder_enabler *event_enabler; |
606828e4 | 548 | struct lttng_kernel_abi_event ev; |
a67ba386 | 549 | struct lttng_kernel_event_recorder *event_recorder; |
19bef247 | 550 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 MD |
551 | struct hlist_head *head; |
552 | bool found = false; | |
49c50022 MD |
553 | |
554 | if (!desc) { | |
555 | /* Unknown syscall */ | |
556 | continue; | |
557 | } | |
3b82c4e1 | 558 | if (lttng_desc_match_enabler(desc, |
1ae083ba | 559 | lttng_event_recorder_enabler_as_enabler(syscall_event_enabler)) <= 0) |
3b82c4e1 | 560 | continue; |
49c50022 | 561 | /* |
3b82c4e1 | 562 | * Check if already created. |
49c50022 | 563 | */ |
3b82c4e1 | 564 | head = utils_borrow_hash_table_bucket( |
8cdc1a81 | 565 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 566 | desc->event_name); |
19bef247 MD |
567 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
568 | if (event_priv->desc == desc | |
569 | && get_syscall_table_from_event(event_priv->pub) == syscall_table) | |
3b82c4e1 MD |
570 | found = true; |
571 | } | |
572 | if (found) | |
49c50022 | 573 | continue; |
3b82c4e1 MD |
574 | |
575 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 576 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
577 | switch (type) { |
578 | case SC_TYPE_ENTRY: | |
606828e4 MD |
579 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
580 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
581 | break; |
582 | case SC_TYPE_EXIT: | |
606828e4 MD |
583 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
584 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
585 | break; |
586 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
587 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
588 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
589 | break; |
590 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
591 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
592 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
593 | break; |
594 | } | |
606828e4 MD |
595 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
596 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
597 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1ae083ba | 598 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
599 | if (!event_enabler) { |
600 | return -ENOMEM; | |
601 | } | |
602 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 603 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 604 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 | 605 | if (IS_ERR(event_recorder)) { |
49c50022 MD |
606 | /* |
607 | * If something goes wrong in event registration | |
608 | * after the first one, we have no choice but to | |
609 | * leave the previous events in there, until | |
610 | * deleted by session teardown. | |
611 | */ | |
a67ba386 | 612 | return PTR_ERR(event_recorder); |
49c50022 | 613 | } |
a67ba386 | 614 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
615 | } |
616 | return 0; | |
617 | } | |
618 | ||
d26015f6 MD |
619 | static |
620 | int lttng_syscalls_populate_events(struct lttng_event_enabler_common *syscall_event_enabler) | |
49c50022 | 621 | { |
d26015f6 MD |
622 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
623 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
624 | struct lttng_kernel_channel_buffer *chan; | |
606828e4 | 625 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
626 | int ret; |
627 | ||
d26015f6 MD |
628 | if (syscall_event_enabler->enabler_type != LTTNG_EVENT_ENABLER_TYPE_RECORDER) |
629 | return 0; | |
630 | event_recorder_enabler = container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
631 | chan = event_recorder_enabler->chan; | |
259b6cb3 | 632 | |
0bb716a8 | 633 | if (hlist_empty(&syscall_table->unknown_syscall_dispatch)) { |
437d5aa5 | 634 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 635 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 636 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 637 | struct lttng_event_recorder_enabler *event_enabler; |
2f804c0a | 638 | |
f405cfce | 639 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
640 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
641 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
642 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
643 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
644 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
d26015f6 | 645 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
646 | if (!event_enabler) { |
647 | return -ENOMEM; | |
648 | } | |
649 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
44b1abdc | 650 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
651 | WARN_ON_ONCE(!event_recorder); |
652 | if (IS_ERR(event_recorder)) { | |
653 | return PTR_ERR(event_recorder); | |
f405cfce | 654 | } |
0bb716a8 | 655 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->unknown_syscall_dispatch); |
f405cfce MD |
656 | } |
657 | ||
0bb716a8 | 658 | if (hlist_empty(&syscall_table->compat_unknown_syscall_dispatch)) { |
437d5aa5 | 659 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 660 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 661 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 662 | struct lttng_event_recorder_enabler *event_enabler; |
b76dc1a0 MD |
663 | |
664 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
665 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
666 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
667 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
668 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
669 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
d26015f6 | 670 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
671 | if (!event_enabler) { |
672 | return -ENOMEM; | |
673 | } | |
674 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 675 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 676 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
677 | if (IS_ERR(event_recorder)) { |
678 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 679 | } |
0bb716a8 | 680 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->compat_unknown_syscall_dispatch); |
b76dc1a0 MD |
681 | } |
682 | ||
0bb716a8 | 683 | if (hlist_empty(&syscall_table->compat_unknown_syscall_exit_dispatch)) { |
437d5aa5 | 684 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 685 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 686 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 687 | struct lttng_event_recorder_enabler *event_enabler; |
2f804c0a MD |
688 | |
689 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
690 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
691 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
692 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
693 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
694 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
d26015f6 | 695 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
696 | if (!event_enabler) { |
697 | return -ENOMEM; | |
698 | } | |
699 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 700 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 701 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
702 | if (IS_ERR(event_recorder)) { |
703 | return PTR_ERR(event_recorder); | |
5b7ac358 | 704 | } |
0bb716a8 | 705 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->compat_unknown_syscall_exit_dispatch); |
5b7ac358 MD |
706 | } |
707 | ||
0bb716a8 | 708 | if (hlist_empty(&syscall_table->unknown_syscall_exit_dispatch)) { |
437d5aa5 | 709 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 710 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 711 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 712 | struct lttng_event_recorder_enabler *event_enabler; |
5b7ac358 MD |
713 | |
714 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
715 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
716 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
717 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
718 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
719 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
d26015f6 | 720 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
721 | if (!event_enabler) { |
722 | return -ENOMEM; | |
723 | } | |
724 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 725 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 726 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
727 | if (IS_ERR(event_recorder)) { |
728 | return PTR_ERR(event_recorder); | |
2f804c0a | 729 | } |
0bb716a8 | 730 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->unknown_syscall_exit_dispatch); |
2f804c0a MD |
731 | } |
732 | ||
ebcc64cd | 733 | ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, |
d26015f6 | 734 | syscall_table->syscall_dispatch, event_recorder_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
735 | if (ret) |
736 | return ret; | |
ebcc64cd | 737 | ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, |
d26015f6 | 738 | syscall_table->syscall_exit_dispatch, event_recorder_enabler, SC_TYPE_EXIT); |
49c50022 MD |
739 | if (ret) |
740 | return ret; | |
5b7ac358 | 741 | |
49c50022 | 742 | #ifdef CONFIG_COMPAT |
ebcc64cd | 743 | ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, |
d26015f6 | 744 | syscall_table->compat_syscall_dispatch, event_recorder_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
745 | if (ret) |
746 | return ret; | |
ebcc64cd | 747 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, |
d26015f6 | 748 | syscall_table->compat_syscall_exit_dispatch, event_recorder_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
749 | if (ret) |
750 | return ret; | |
751 | #endif | |
259b6cb3 MD |
752 | return ret; |
753 | } | |
754 | ||
755 | /* | |
8a8ac9a8 FD |
756 | * Should be called with sessions lock held. |
757 | */ | |
d26015f6 | 758 | int lttng_syscalls_register_event(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 759 | { |
d26015f6 MD |
760 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
761 | int ret; | |
8a8ac9a8 | 762 | |
0bb716a8 | 763 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 764 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
765 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
766 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 767 | return -ENOMEM; |
8a8ac9a8 | 768 | } |
0bb716a8 | 769 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
770 | /* create syscall table mapping syscall to events */ |
771 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 772 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 773 | return -ENOMEM; |
8a8ac9a8 FD |
774 | } |
775 | ||
d26015f6 | 776 | |
8a8ac9a8 | 777 | #ifdef CONFIG_COMPAT |
0bb716a8 | 778 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 779 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
780 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
781 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 782 | return -ENOMEM; |
8a8ac9a8 FD |
783 | } |
784 | ||
0bb716a8 | 785 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
786 | /* create syscall table mapping compat syscall to events */ |
787 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 788 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 789 | return -ENOMEM; |
8a8ac9a8 FD |
790 | } |
791 | #endif | |
0bb716a8 MD |
792 | if (!syscall_table->sc_filter) { |
793 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 794 | GFP_KERNEL); |
0bb716a8 | 795 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
796 | return -ENOMEM; |
797 | } | |
798 | ||
d26015f6 MD |
799 | ret = lttng_syscalls_populate_events(syscall_event_enabler); |
800 | if (ret) | |
801 | return ret; | |
802 | ||
803 | wrapper_vmalloc_sync_mappings(); | |
804 | ||
0bb716a8 | 805 | if (!syscall_table->sys_enter_registered) { |
8a8ac9a8 | 806 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 807 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
808 | if (ret) |
809 | return ret; | |
0bb716a8 | 810 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 811 | } |
0bb716a8 | 812 | if (!syscall_table->sys_exit_registered) { |
8a8ac9a8 | 813 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 814 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 FD |
815 | if (ret) { |
816 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 817 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
818 | return ret; |
819 | } | |
0bb716a8 | 820 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 821 | } |
0fab709d MD |
822 | |
823 | ret = lttng_syscalls_create_matching_event_notifiers(syscall_event_enabler); | |
824 | if (ret) | |
825 | return ret; | |
826 | ||
8a8ac9a8 FD |
827 | return ret; |
828 | } | |
829 | ||
830 | static | |
831 | int create_unknown_event_notifier( | |
832 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
833 | enum sc_type type) | |
834 | { | |
19bef247 | 835 | struct lttng_kernel_event_common_private *event_priv; |
a67ba386 | 836 | struct lttng_kernel_event_notifier *event_notifier; |
437d5aa5 | 837 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 838 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
0bb716a8 | 839 | struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table; |
606828e4 | 840 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
5b9817ae | 841 | uint64_t user_token = event_notifier_enabler->parent.user_token; |
99f52fcc | 842 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8d554755 | 843 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler( |
8a8ac9a8 FD |
844 | event_notifier_enabler); |
845 | struct hlist_head *unknown_dispatch_list; | |
846 | int ret = 0; | |
847 | bool found = false; | |
606828e4 MD |
848 | enum lttng_kernel_abi_syscall_abi abi; |
849 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
850 | struct hlist_head *head; |
851 | ||
852 | switch (type) { | |
853 | case SC_TYPE_ENTRY: | |
854 | desc = &__event_desc___syscall_entry_unknown; | |
0bb716a8 | 855 | unknown_dispatch_list = &syscall_table->unknown_syscall_dispatch; |
606828e4 MD |
856 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
857 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
858 | break; |
859 | case SC_TYPE_EXIT: | |
860 | desc = &__event_desc___syscall_exit_unknown; | |
0bb716a8 | 861 | unknown_dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; |
606828e4 MD |
862 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
863 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
864 | break; |
865 | case SC_TYPE_COMPAT_ENTRY: | |
866 | desc = &__event_desc___compat_syscall_entry_unknown; | |
0bb716a8 | 867 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; |
606828e4 MD |
868 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
869 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
870 | break; |
871 | case SC_TYPE_COMPAT_EXIT: | |
872 | desc = &__event_desc___compat_syscall_exit_unknown; | |
0bb716a8 | 873 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
606828e4 MD |
874 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
875 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
876 | break; |
877 | default: | |
878 | BUG_ON(1); | |
879 | } | |
880 | ||
881 | /* | |
882 | * Check if already created. | |
883 | */ | |
33af697f MD |
884 | head = utils_borrow_hash_table_bucket(group->events_ht.table, |
885 | LTTNG_EVENT_HT_SIZE, desc->event_name); | |
19bef247 MD |
886 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
887 | if (event_priv->desc == desc && | |
888 | event_priv->user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
889 | found = true; |
890 | } | |
891 | if (found) | |
892 | goto end; | |
893 | ||
894 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 895 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 896 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 897 | |
606828e4 | 898 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 899 | |
606828e4 | 900 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
1bbb5b2d | 901 | event_notifier_param.event.token = user_token; |
8a8ac9a8 FD |
902 | event_notifier_param.event.u.syscall.abi = abi; |
903 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1bbb5b2d | 904 | event_notifier_param.error_counter_index = error_counter_index; |
8a8ac9a8 | 905 | |
1bbb5b2d MD |
906 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
907 | &event_notifier_param, group); | |
908 | WARN_ON_ONCE(!event_notifier_enabler); | |
909 | event_notifier = _lttng_event_notifier_create(event_notifier_enabler, desc); | |
910 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); | |
a67ba386 | 911 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 912 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 913 | desc->event_name); |
8a8ac9a8 FD |
914 | ret = -ENOMEM; |
915 | goto end; | |
916 | } | |
917 | ||
a67ba386 | 918 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
919 | |
920 | end: | |
921 | return ret; | |
922 | } | |
923 | ||
924 | static int create_matching_event_notifiers( | |
1bbb5b2d | 925 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler, |
a67ba386 | 926 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
927 | size_t table_len, enum sc_type type) |
928 | { | |
1bbb5b2d | 929 | struct lttng_event_notifier_group *group = syscall_event_notifier_enabler->group; |
437d5aa5 | 930 | const struct lttng_kernel_event_desc *desc; |
1bbb5b2d MD |
931 | uint64_t user_token = syscall_event_notifier_enabler->parent.user_token; |
932 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
8a8ac9a8 FD |
933 | unsigned int i; |
934 | int ret = 0; | |
935 | ||
936 | /* iterate over all syscall and create event_notifier that match */ | |
937 | for (i = 0; i < table_len; i++) { | |
1bbb5b2d | 938 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
19bef247 | 939 | struct lttng_kernel_event_common_private *event_priv; |
a67ba386 | 940 | struct lttng_kernel_event_notifier *event_notifier; |
606828e4 | 941 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
942 | struct hlist_head *head; |
943 | int found = 0; | |
944 | ||
945 | desc = table[i].desc; | |
946 | if (!desc) { | |
947 | /* Unknown syscall */ | |
948 | continue; | |
949 | } | |
950 | ||
951 | if (!lttng_desc_match_enabler(desc, | |
1bbb5b2d | 952 | lttng_event_notifier_enabler_as_enabler(syscall_event_notifier_enabler))) |
8a8ac9a8 FD |
953 | continue; |
954 | ||
955 | /* | |
956 | * Check if already created. | |
957 | */ | |
33af697f MD |
958 | head = utils_borrow_hash_table_bucket(group->events_ht.table, |
959 | LTTNG_EVENT_HT_SIZE, desc->event_name); | |
19bef247 MD |
960 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
961 | if (event_priv->desc == desc | |
962 | && event_priv->user_token == syscall_event_notifier_enabler->parent.user_token) | |
8a8ac9a8 FD |
963 | found = 1; |
964 | } | |
965 | if (found) | |
966 | continue; | |
967 | ||
968 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
969 | switch (type) { | |
970 | case SC_TYPE_ENTRY: | |
606828e4 MD |
971 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
972 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
973 | break; |
974 | case SC_TYPE_EXIT: | |
606828e4 MD |
975 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
976 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
977 | break; |
978 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
979 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
980 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
981 | break; |
982 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
983 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
984 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
985 | break; |
986 | } | |
437d5aa5 | 987 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
988 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
989 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
990 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1bbb5b2d MD |
991 | event_notifier_param.event.token = user_token; |
992 | event_notifier_param.error_counter_index = error_counter_index; | |
993 | ||
994 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
995 | &event_notifier_param, group); | |
996 | WARN_ON_ONCE(!event_notifier_enabler); | |
997 | event_notifier = _lttng_event_notifier_create(event_notifier_enabler, desc); | |
998 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); | |
8a8ac9a8 FD |
999 | if (IS_ERR(event_notifier)) { |
1000 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1001 | desc->event_name); |
8a8ac9a8 FD |
1002 | ret = -ENOMEM; |
1003 | goto end; | |
1004 | } | |
1005 | ||
a67ba386 | 1006 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1007 | } |
1008 | ||
1009 | end: | |
1010 | return ret; | |
1011 | ||
1012 | } | |
1013 | ||
0fab709d MD |
1014 | static |
1015 | int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 FD |
1016 | { |
1017 | int ret; | |
606828e4 | 1018 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
0fab709d MD |
1019 | event_enabler->event_param.u.syscall.entryexit; |
1020 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1021 | ||
1022 | if (event_enabler->enabler_type != LTTNG_EVENT_ENABLER_TYPE_NOTIFIER) | |
1023 | return 0; | |
1024 | event_notifier_enabler = container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
8a8ac9a8 | 1025 | |
606828e4 | 1026 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1027 | ret = create_matching_event_notifiers(event_notifier_enabler, |
ebcc64cd | 1028 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1029 | if (ret) |
1030 | goto end; | |
1031 | ||
1032 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
ebcc64cd | 1033 | compat_sc_table.table, compat_sc_table.len, |
8a8ac9a8 FD |
1034 | SC_TYPE_COMPAT_ENTRY); |
1035 | if (ret) | |
1036 | goto end; | |
1037 | ||
1038 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1039 | SC_TYPE_ENTRY); | |
1040 | if (ret) | |
1041 | goto end; | |
1042 | ||
1043 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1044 | SC_TYPE_COMPAT_ENTRY); | |
1045 | if (ret) | |
1046 | goto end; | |
1047 | } | |
1048 | ||
606828e4 | 1049 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1050 | ret = create_matching_event_notifiers(event_notifier_enabler, |
ebcc64cd | 1051 | sc_exit_table.table, sc_exit_table.len, |
8a8ac9a8 FD |
1052 | SC_TYPE_EXIT); |
1053 | if (ret) | |
1054 | goto end; | |
1055 | ||
1056 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1057 | SC_TYPE_EXIT); | |
1058 | if (ret) | |
1059 | goto end; | |
1060 | ||
1061 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
ebcc64cd | 1062 | compat_sc_exit_table.table, compat_sc_exit_table.len, |
8a8ac9a8 FD |
1063 | SC_TYPE_COMPAT_EXIT); |
1064 | if (ret) | |
1065 | goto end; | |
1066 | ||
1067 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1068 | SC_TYPE_COMPAT_EXIT); | |
1069 | if (ret) | |
1070 | goto end; | |
1071 | } | |
1072 | ||
1073 | end: | |
1074 | return ret; | |
1075 | } | |
1076 | ||
6053e75e | 1077 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
1078 | { |
1079 | int ret; | |
1080 | ||
0bb716a8 | 1081 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 1082 | return 0; |
0bb716a8 | 1083 | if (syscall_table->sys_enter_registered) { |
2d9cd7f3 | 1084 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 1085 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
1086 | if (ret) |
1087 | return ret; | |
0bb716a8 | 1088 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 1089 | } |
0bb716a8 | 1090 | if (syscall_table->sys_exit_registered) { |
2d9cd7f3 | 1091 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 1092 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
1093 | if (ret) |
1094 | return ret; | |
0bb716a8 | 1095 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 1096 | } |
badfe9f5 MD |
1097 | return 0; |
1098 | } | |
1099 | ||
6053e75e | 1100 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 1101 | { |
0bb716a8 MD |
1102 | kfree(syscall_table->syscall_dispatch); |
1103 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 1104 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
1105 | kfree(syscall_table->compat_syscall_dispatch); |
1106 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 1107 | #endif |
0bb716a8 | 1108 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
1109 | return 0; |
1110 | } | |
1111 | ||
1112 | static | |
1113 | int get_syscall_nr(const char *syscall_name) | |
1114 | { | |
1115 | int syscall_nr = -1; | |
1116 | int i; | |
1117 | ||
ebcc64cd | 1118 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 1119 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1120 | const char *it_name; |
80f87dd2 | 1121 | |
ebcc64cd | 1122 | entry = &sc_table.table[i]; |
80f87dd2 MD |
1123 | if (!entry->desc) |
1124 | continue; | |
437d5aa5 | 1125 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1126 | it_name += strlen(SYSCALL_ENTRY_STR); |
1127 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1128 | syscall_nr = i; |
1129 | break; | |
1130 | } | |
1131 | } | |
1132 | return syscall_nr; | |
1133 | } | |
1134 | ||
1135 | static | |
1136 | int get_compat_syscall_nr(const char *syscall_name) | |
1137 | { | |
1138 | int syscall_nr = -1; | |
1139 | int i; | |
1140 | ||
ebcc64cd | 1141 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 1142 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1143 | const char *it_name; |
80f87dd2 | 1144 | |
ebcc64cd | 1145 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
1146 | if (!entry->desc) |
1147 | continue; | |
437d5aa5 | 1148 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1149 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1150 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1151 | syscall_nr = i; |
1152 | break; | |
1153 | } | |
1154 | } | |
1155 | return syscall_nr; | |
1156 | } | |
1157 | ||
12e579db MD |
1158 | static |
1159 | uint32_t get_sc_tables_len(void) | |
1160 | { | |
ebcc64cd | 1161 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
1162 | } |
1163 | ||
badfe9f5 | 1164 | static |
ade8a729 FD |
1165 | const char *get_syscall_name(const char *desc_name, |
1166 | enum lttng_syscall_abi abi, | |
1167 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1168 | { |
badfe9f5 | 1169 | size_t prefix_len = 0; |
80f87dd2 | 1170 | |
80f87dd2 | 1171 | |
ade8a729 | 1172 | switch (entryexit) { |
badfe9f5 | 1173 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1174 | switch (abi) { |
badfe9f5 MD |
1175 | case LTTNG_SYSCALL_ABI_NATIVE: |
1176 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1177 | break; | |
1178 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1179 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1180 | break; | |
80f87dd2 | 1181 | } |
badfe9f5 MD |
1182 | break; |
1183 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1184 | switch (abi) { |
badfe9f5 MD |
1185 | case LTTNG_SYSCALL_ABI_NATIVE: |
1186 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1187 | break; | |
1188 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1189 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1190 | break; | |
80f87dd2 | 1191 | } |
badfe9f5 | 1192 | break; |
80f87dd2 | 1193 | } |
badfe9f5 | 1194 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1195 | return desc_name + prefix_len; |
badfe9f5 MD |
1196 | } |
1197 | ||
ade8a729 FD |
1198 | static |
1199 | int lttng_syscall_filter_enable( | |
1200 | struct lttng_syscall_filter *filter, | |
1201 | const char *desc_name, enum lttng_syscall_abi abi, | |
1202 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1203 | { |
badfe9f5 MD |
1204 | const char *syscall_name; |
1205 | unsigned long *bitmap; | |
1206 | int syscall_nr; | |
1207 | ||
ade8a729 | 1208 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1209 | |
ade8a729 | 1210 | switch (abi) { |
badfe9f5 MD |
1211 | case LTTNG_SYSCALL_ABI_NATIVE: |
1212 | syscall_nr = get_syscall_nr(syscall_name); | |
1213 | break; | |
1214 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1215 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1216 | break; | |
1217 | default: | |
1218 | return -EINVAL; | |
80f87dd2 | 1219 | } |
badfe9f5 MD |
1220 | if (syscall_nr < 0) |
1221 | return -ENOENT; | |
1222 | ||
ade8a729 | 1223 | switch (entryexit) { |
badfe9f5 | 1224 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1225 | switch (abi) { |
badfe9f5 MD |
1226 | case LTTNG_SYSCALL_ABI_NATIVE: |
1227 | bitmap = filter->sc_entry; | |
1228 | break; | |
1229 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1230 | bitmap = filter->sc_compat_entry; | |
1231 | break; | |
6d9694d8 MD |
1232 | default: |
1233 | return -EINVAL; | |
80f87dd2 | 1234 | } |
badfe9f5 MD |
1235 | break; |
1236 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1237 | switch (abi) { |
badfe9f5 MD |
1238 | case LTTNG_SYSCALL_ABI_NATIVE: |
1239 | bitmap = filter->sc_exit; | |
1240 | break; | |
1241 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1242 | bitmap = filter->sc_compat_exit; | |
1243 | break; | |
6d9694d8 MD |
1244 | default: |
1245 | return -EINVAL; | |
80f87dd2 | 1246 | } |
badfe9f5 MD |
1247 | break; |
1248 | default: | |
1249 | return -EINVAL; | |
80f87dd2 | 1250 | } |
badfe9f5 MD |
1251 | if (test_bit(syscall_nr, bitmap)) |
1252 | return -EEXIST; | |
1253 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1254 | return 0; |
80f87dd2 MD |
1255 | } |
1256 | ||
9b2f1c54 | 1257 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1258 | { |
9b2f1c54 MD |
1259 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
1260 | int ret; | |
8a8ac9a8 | 1261 | |
9b2f1c54 | 1262 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1263 | |
0bb716a8 | 1264 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, |
9b2f1c54 MD |
1265 | event->priv->desc->event_name, event->priv->u.syscall.abi, |
1266 | event->priv->u.syscall.entryexit); | |
1267 | if (ret) | |
1268 | return ret; | |
8a8ac9a8 | 1269 | |
9b2f1c54 MD |
1270 | switch (event->type) { |
1271 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
8a8ac9a8 | 1272 | break; |
9b2f1c54 MD |
1273 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: |
1274 | { | |
1275 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; | |
1276 | struct hlist_head *dispatch_list; | |
1277 | ||
1278 | switch (event->priv->u.syscall.entryexit) { | |
1279 | case LTTNG_SYSCALL_ENTRY: | |
1280 | switch (event->priv->u.syscall.abi) { | |
1281 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1282 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1283 | break; | |
1284 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1285 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1286 | break; | |
1287 | default: | |
1288 | ret = -EINVAL; | |
1289 | goto end; | |
1290 | } | |
8a8ac9a8 | 1291 | break; |
9b2f1c54 MD |
1292 | case LTTNG_SYSCALL_EXIT: |
1293 | switch (event->priv->u.syscall.abi) { | |
1294 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1295 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1296 | break; | |
1297 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1298 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1299 | break; | |
1300 | default: | |
1301 | ret = -EINVAL; | |
1302 | goto end; | |
1303 | } | |
8a8ac9a8 | 1304 | break; |
6866b1c7 MJ |
1305 | default: |
1306 | ret = -EINVAL; | |
1307 | goto end; | |
8a8ac9a8 | 1308 | } |
9b2f1c54 MD |
1309 | |
1310 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1311 | break; |
9b2f1c54 | 1312 | } |
6866b1c7 | 1313 | default: |
9b2f1c54 MD |
1314 | WARN_ON_ONCE(1); |
1315 | return -ENOSYS; | |
8a8ac9a8 | 1316 | } |
8a8ac9a8 | 1317 | end: |
9b2f1c54 | 1318 | return ret; |
ade8a729 FD |
1319 | } |
1320 | ||
1321 | static | |
f2db8be3 | 1322 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 FD |
1323 | const char *desc_name, enum lttng_syscall_abi abi, |
1324 | enum lttng_syscall_entryexit entryexit) | |
1325 | { | |
badfe9f5 MD |
1326 | const char *syscall_name; |
1327 | unsigned long *bitmap; | |
1328 | int syscall_nr; | |
80f87dd2 | 1329 | |
ade8a729 | 1330 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1331 | |
ade8a729 | 1332 | switch (abi) { |
badfe9f5 MD |
1333 | case LTTNG_SYSCALL_ABI_NATIVE: |
1334 | syscall_nr = get_syscall_nr(syscall_name); | |
1335 | break; | |
1336 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1337 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1338 | break; | |
1339 | default: | |
1340 | return -EINVAL; | |
80f87dd2 | 1341 | } |
badfe9f5 MD |
1342 | if (syscall_nr < 0) |
1343 | return -ENOENT; | |
80f87dd2 | 1344 | |
ade8a729 | 1345 | switch (entryexit) { |
badfe9f5 | 1346 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1347 | switch (abi) { |
badfe9f5 MD |
1348 | case LTTNG_SYSCALL_ABI_NATIVE: |
1349 | bitmap = filter->sc_entry; | |
1350 | break; | |
1351 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1352 | bitmap = filter->sc_compat_entry; | |
1353 | break; | |
6d9694d8 MD |
1354 | default: |
1355 | return -EINVAL; | |
80f87dd2 | 1356 | } |
badfe9f5 MD |
1357 | break; |
1358 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1359 | switch (abi) { |
badfe9f5 MD |
1360 | case LTTNG_SYSCALL_ABI_NATIVE: |
1361 | bitmap = filter->sc_exit; | |
1362 | break; | |
1363 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1364 | bitmap = filter->sc_compat_exit; | |
1365 | break; | |
6d9694d8 MD |
1366 | default: |
1367 | return -EINVAL; | |
80f87dd2 | 1368 | } |
badfe9f5 MD |
1369 | break; |
1370 | default: | |
1371 | return -EINVAL; | |
80f87dd2 | 1372 | } |
badfe9f5 MD |
1373 | if (!test_bit(syscall_nr, bitmap)) |
1374 | return -EEXIST; | |
1375 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1376 | |
badfe9f5 | 1377 | return 0; |
259b6cb3 | 1378 | } |
2d2464bd | 1379 | |
9b2f1c54 | 1380 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1381 | { |
9b2f1c54 | 1382 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
8a8ac9a8 FD |
1383 | int ret; |
1384 | ||
0bb716a8 | 1385 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, |
9b2f1c54 MD |
1386 | event->priv->desc->event_name, event->priv->u.syscall.abi, |
1387 | event->priv->u.syscall.entryexit); | |
1388 | if (ret) | |
1389 | return ret; | |
8a8ac9a8 | 1390 | |
9b2f1c54 MD |
1391 | switch (event->type) { |
1392 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1393 | break; | |
1394 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1395 | { | |
1396 | hlist_del_rcu(&event->priv->u.syscall.node); | |
1397 | break; | |
1398 | } | |
1399 | default: | |
1400 | WARN_ON_ONCE(1); | |
1401 | return -ENOSYS; | |
1402 | } | |
8a8ac9a8 FD |
1403 | return 0; |
1404 | } | |
1405 | ||
2d2464bd MD |
1406 | static |
1407 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1408 | { | |
1409 | const struct trace_syscall_entry *entry; | |
1410 | int iter = 0; | |
1411 | ||
ebcc64cd FD |
1412 | for (entry = sc_table.table; |
1413 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1414 | entry++) { |
1415 | if (iter++ >= *pos) | |
1416 | return entry; | |
1417 | } | |
ebcc64cd FD |
1418 | for (entry = compat_sc_table.table; |
1419 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1420 | entry++) { |
1421 | if (iter++ >= *pos) | |
1422 | return entry; | |
1423 | } | |
1424 | /* End of list */ | |
1425 | return NULL; | |
1426 | } | |
1427 | ||
1428 | static | |
1429 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1430 | { | |
1431 | return (void *) syscall_list_get_entry(pos); | |
1432 | } | |
1433 | ||
1434 | static | |
1435 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1436 | { | |
1437 | (*ppos)++; | |
1438 | return (void *) syscall_list_get_entry(ppos); | |
1439 | } | |
1440 | ||
1441 | static | |
1442 | void syscall_list_stop(struct seq_file *m, void *p) | |
1443 | { | |
1444 | } | |
1445 | ||
12e579db MD |
1446 | static |
1447 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1448 | const struct trace_syscall_entry **table, | |
1449 | unsigned int *bitness) | |
1450 | { | |
ebcc64cd | 1451 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1452 | if (bitness) |
1453 | *bitness = BITS_PER_LONG; | |
1454 | if (table) | |
ebcc64cd | 1455 | *table = sc_table.table; |
12e579db MD |
1456 | return 0; |
1457 | } | |
ebcc64cd FD |
1458 | if (!(entry >= compat_sc_table.table |
1459 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1460 | return -EINVAL; |
1461 | } | |
1462 | if (bitness) | |
1463 | *bitness = 32; | |
1464 | if (table) | |
ebcc64cd | 1465 | *table = compat_sc_table.table; |
12e579db MD |
1466 | return 0; |
1467 | } | |
1468 | ||
2d2464bd MD |
1469 | static |
1470 | int syscall_list_show(struct seq_file *m, void *p) | |
1471 | { | |
1472 | const struct trace_syscall_entry *table, *entry = p; | |
1473 | unsigned int bitness; | |
d4291869 | 1474 | unsigned long index; |
12e579db | 1475 | int ret; |
d4291869 | 1476 | const char *name; |
2d2464bd | 1477 | |
12e579db MD |
1478 | ret = get_sc_table(entry, &table, &bitness); |
1479 | if (ret) | |
1480 | return ret; | |
f4855b46 MD |
1481 | if (!entry->desc) |
1482 | return 0; | |
ebcc64cd | 1483 | if (table == sc_table.table) { |
d4291869 | 1484 | index = entry - table; |
437d5aa5 | 1485 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1486 | } else { |
ebcc64cd | 1487 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1488 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1489 | } |
12e579db | 1490 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1491 | index, name, bitness); |
2d2464bd MD |
1492 | return 0; |
1493 | } | |
1494 | ||
1495 | static | |
1496 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1497 | .start = syscall_list_start, | |
1498 | .next = syscall_list_next, | |
1499 | .stop = syscall_list_stop, | |
1500 | .show = syscall_list_show, | |
1501 | }; | |
1502 | ||
1503 | static | |
1504 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1505 | { | |
1506 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1507 | } | |
1508 | ||
1509 | const struct file_operations lttng_syscall_list_fops = { | |
1510 | .owner = THIS_MODULE, | |
1511 | .open = lttng_syscall_list_open, | |
1512 | .read = seq_read, | |
1513 | .llseek = seq_lseek, | |
1514 | .release = seq_release, | |
1515 | }; | |
12e579db | 1516 | |
badfe9f5 MD |
1517 | /* |
1518 | * A syscall is enabled if it is traced for either entry or exit. | |
1519 | */ | |
c970b655 | 1520 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1521 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1522 | { |
1523 | uint32_t len, sc_tables_len, bitmask_len; | |
1524 | int ret = 0, bit; | |
1525 | char *tmp_mask; | |
1526 | struct lttng_syscall_filter *filter; | |
1527 | ||
1528 | ret = get_user(len, &usyscall_mask->len); | |
1529 | if (ret) | |
1530 | return ret; | |
1531 | sc_tables_len = get_sc_tables_len(); | |
1532 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1533 | if (len < sc_tables_len) { | |
1534 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1535 | } | |
1536 | /* Array is large enough, we can copy array to user-space. */ | |
1537 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1538 | if (!tmp_mask) | |
1539 | return -ENOMEM; | |
0bb716a8 | 1540 | filter = syscall_table->sc_filter; |
12e579db | 1541 | |
ebcc64cd | 1542 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1543 | char state; |
2f25059d | 1544 | |
0bb716a8 MD |
1545 | if (syscall_table->syscall_dispatch) { |
1546 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1547 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1548 | state = test_bit(bit, filter->sc_entry) |
1549 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1550 | else |
1551 | state = 1; | |
1552 | } else { | |
1553 | state = 0; | |
1554 | } | |
1555 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1556 | } |
1557 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1558 | char state; |
2f25059d | 1559 | |
0bb716a8 MD |
1560 | if (syscall_table->compat_syscall_dispatch) { |
1561 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1562 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1563 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1564 | filter->sc_compat_entry) |
ebcc64cd | 1565 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1566 | filter->sc_compat_exit); |
2f25059d MD |
1567 | else |
1568 | state = 1; | |
1569 | } else { | |
1570 | state = 0; | |
1571 | } | |
1572 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1573 | } |
1574 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1575 | ret = -EFAULT; | |
1576 | kfree(tmp_mask); | |
1577 | return ret; | |
1578 | } | |
082d4946 MD |
1579 | |
1580 | int lttng_abi_syscall_list(void) | |
1581 | { | |
1582 | struct file *syscall_list_file; | |
1583 | int file_fd, ret; | |
1584 | ||
4ac10b76 | 1585 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1586 | if (file_fd < 0) { |
1587 | ret = file_fd; | |
1588 | goto fd_error; | |
1589 | } | |
1590 | ||
1591 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1592 | <tng_syscall_list_fops, | |
1593 | NULL, O_RDWR); | |
1594 | if (IS_ERR(syscall_list_file)) { | |
1595 | ret = PTR_ERR(syscall_list_file); | |
1596 | goto file_error; | |
1597 | } | |
1598 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1599 | if (ret < 0) | |
1600 | goto open_error; | |
1601 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1602 | return file_fd; |
1603 | ||
1604 | open_error: | |
1605 | fput(syscall_list_file); | |
1606 | file_error: | |
1607 | put_unused_fd(file_fd); | |
1608 | fd_error: | |
1609 | return ret; | |
1610 | } |