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 | { |
0def9170 | 539 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&syscall_event_enabler->parent); |
0bb716a8 | 540 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(&syscall_event_enabler->parent); |
def1e304 | 541 | struct lttng_kernel_channel_buffer *chan = syscall_event_enabler->chan; |
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 | */ |
0def9170 | 564 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 MD |
565 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
566 | if (event_priv->desc == desc | |
567 | && get_syscall_table_from_event(event_priv->pub) == syscall_table) | |
3b82c4e1 MD |
568 | found = true; |
569 | } | |
570 | if (found) | |
49c50022 | 571 | continue; |
3b82c4e1 MD |
572 | |
573 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 574 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
575 | switch (type) { |
576 | case SC_TYPE_ENTRY: | |
606828e4 MD |
577 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
578 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
579 | break; |
580 | case SC_TYPE_EXIT: | |
606828e4 MD |
581 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
582 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
583 | break; |
584 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
585 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
586 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
587 | break; |
588 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
589 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
590 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
591 | break; |
592 | } | |
606828e4 MD |
593 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
594 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
595 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1ae083ba | 596 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
597 | if (!event_enabler) { |
598 | return -ENOMEM; | |
599 | } | |
600 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 601 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 602 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 | 603 | if (IS_ERR(event_recorder)) { |
49c50022 MD |
604 | /* |
605 | * If something goes wrong in event registration | |
606 | * after the first one, we have no choice but to | |
607 | * leave the previous events in there, until | |
608 | * deleted by session teardown. | |
609 | */ | |
a67ba386 | 610 | return PTR_ERR(event_recorder); |
49c50022 | 611 | } |
a67ba386 | 612 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
613 | } |
614 | return 0; | |
615 | } | |
616 | ||
d26015f6 MD |
617 | static |
618 | int lttng_syscalls_populate_events(struct lttng_event_enabler_common *syscall_event_enabler) | |
49c50022 | 619 | { |
d26015f6 MD |
620 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
621 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
622 | struct lttng_kernel_channel_buffer *chan; | |
606828e4 | 623 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
624 | int ret; |
625 | ||
d26015f6 MD |
626 | if (syscall_event_enabler->enabler_type != LTTNG_EVENT_ENABLER_TYPE_RECORDER) |
627 | return 0; | |
628 | event_recorder_enabler = container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
629 | chan = event_recorder_enabler->chan; | |
259b6cb3 | 630 | |
0bb716a8 | 631 | if (hlist_empty(&syscall_table->unknown_syscall_dispatch)) { |
437d5aa5 | 632 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 633 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 634 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 635 | struct lttng_event_recorder_enabler *event_enabler; |
2f804c0a | 636 | |
f405cfce | 637 | memset(&ev, 0, sizeof(ev)); |
606828e4 MD |
638 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
639 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
640 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
641 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
642 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
d26015f6 | 643 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
644 | if (!event_enabler) { |
645 | return -ENOMEM; | |
646 | } | |
647 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
44b1abdc | 648 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
649 | WARN_ON_ONCE(!event_recorder); |
650 | if (IS_ERR(event_recorder)) { | |
651 | return PTR_ERR(event_recorder); | |
f405cfce | 652 | } |
0bb716a8 | 653 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->unknown_syscall_dispatch); |
f405cfce MD |
654 | } |
655 | ||
0bb716a8 | 656 | if (hlist_empty(&syscall_table->compat_unknown_syscall_dispatch)) { |
437d5aa5 | 657 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 658 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 659 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 660 | struct lttng_event_recorder_enabler *event_enabler; |
b76dc1a0 MD |
661 | |
662 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
663 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
664 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
665 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
666 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
667 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
d26015f6 | 668 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
669 | if (!event_enabler) { |
670 | return -ENOMEM; | |
671 | } | |
672 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 673 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 674 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
675 | if (IS_ERR(event_recorder)) { |
676 | return PTR_ERR(event_recorder); | |
b76dc1a0 | 677 | } |
0bb716a8 | 678 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->compat_unknown_syscall_dispatch); |
b76dc1a0 MD |
679 | } |
680 | ||
0bb716a8 | 681 | if (hlist_empty(&syscall_table->compat_unknown_syscall_exit_dispatch)) { |
437d5aa5 | 682 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 683 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 684 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 685 | struct lttng_event_recorder_enabler *event_enabler; |
2f804c0a MD |
686 | |
687 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
688 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
689 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
690 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
691 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
692 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
d26015f6 | 693 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
694 | if (!event_enabler) { |
695 | return -ENOMEM; | |
696 | } | |
697 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 698 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 699 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
700 | if (IS_ERR(event_recorder)) { |
701 | return PTR_ERR(event_recorder); | |
5b7ac358 | 702 | } |
0bb716a8 | 703 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->compat_unknown_syscall_exit_dispatch); |
5b7ac358 MD |
704 | } |
705 | ||
0bb716a8 | 706 | if (hlist_empty(&syscall_table->unknown_syscall_exit_dispatch)) { |
437d5aa5 | 707 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 708 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 709 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 710 | struct lttng_event_recorder_enabler *event_enabler; |
5b7ac358 MD |
711 | |
712 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
713 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
714 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
715 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
716 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
717 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
d26015f6 | 718 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
719 | if (!event_enabler) { |
720 | return -ENOMEM; | |
721 | } | |
722 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 723 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 724 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
725 | if (IS_ERR(event_recorder)) { |
726 | return PTR_ERR(event_recorder); | |
2f804c0a | 727 | } |
0bb716a8 | 728 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->unknown_syscall_exit_dispatch); |
2f804c0a MD |
729 | } |
730 | ||
ebcc64cd | 731 | ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, |
d26015f6 | 732 | syscall_table->syscall_dispatch, event_recorder_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
733 | if (ret) |
734 | return ret; | |
ebcc64cd | 735 | ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, |
d26015f6 | 736 | syscall_table->syscall_exit_dispatch, event_recorder_enabler, SC_TYPE_EXIT); |
49c50022 MD |
737 | if (ret) |
738 | return ret; | |
5b7ac358 | 739 | |
49c50022 | 740 | #ifdef CONFIG_COMPAT |
ebcc64cd | 741 | ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, |
d26015f6 | 742 | syscall_table->compat_syscall_dispatch, event_recorder_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
743 | if (ret) |
744 | return ret; | |
ebcc64cd | 745 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, |
d26015f6 | 746 | syscall_table->compat_syscall_exit_dispatch, event_recorder_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
747 | if (ret) |
748 | return ret; | |
749 | #endif | |
259b6cb3 MD |
750 | return ret; |
751 | } | |
752 | ||
753 | /* | |
8a8ac9a8 FD |
754 | * Should be called with sessions lock held. |
755 | */ | |
d26015f6 | 756 | int lttng_syscalls_register_event(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 757 | { |
d26015f6 MD |
758 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
759 | int ret; | |
8a8ac9a8 | 760 | |
0bb716a8 | 761 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 762 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
763 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
764 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 765 | return -ENOMEM; |
8a8ac9a8 | 766 | } |
0bb716a8 | 767 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
768 | /* create syscall table mapping syscall to events */ |
769 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 770 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 771 | return -ENOMEM; |
8a8ac9a8 FD |
772 | } |
773 | ||
d26015f6 | 774 | |
8a8ac9a8 | 775 | #ifdef CONFIG_COMPAT |
0bb716a8 | 776 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 777 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
778 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
779 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 780 | return -ENOMEM; |
8a8ac9a8 FD |
781 | } |
782 | ||
0bb716a8 | 783 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
784 | /* create syscall table mapping compat syscall to events */ |
785 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 786 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 787 | return -ENOMEM; |
8a8ac9a8 FD |
788 | } |
789 | #endif | |
0bb716a8 MD |
790 | if (!syscall_table->sc_filter) { |
791 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 792 | GFP_KERNEL); |
0bb716a8 | 793 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
794 | return -ENOMEM; |
795 | } | |
796 | ||
d26015f6 MD |
797 | ret = lttng_syscalls_populate_events(syscall_event_enabler); |
798 | if (ret) | |
799 | return ret; | |
800 | ||
801 | wrapper_vmalloc_sync_mappings(); | |
802 | ||
0bb716a8 | 803 | if (!syscall_table->sys_enter_registered) { |
8a8ac9a8 | 804 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 805 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
806 | if (ret) |
807 | return ret; | |
0bb716a8 | 808 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 809 | } |
0bb716a8 | 810 | if (!syscall_table->sys_exit_registered) { |
8a8ac9a8 | 811 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 812 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 FD |
813 | if (ret) { |
814 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 815 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
816 | return ret; |
817 | } | |
0bb716a8 | 818 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 819 | } |
0fab709d MD |
820 | |
821 | ret = lttng_syscalls_create_matching_event_notifiers(syscall_event_enabler); | |
822 | if (ret) | |
823 | return ret; | |
824 | ||
8a8ac9a8 FD |
825 | return ret; |
826 | } | |
827 | ||
828 | static | |
829 | int create_unknown_event_notifier( | |
830 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
831 | enum sc_type type) | |
832 | { | |
0def9170 | 833 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_notifier_enabler->parent); |
19bef247 | 834 | struct lttng_kernel_event_common_private *event_priv; |
a67ba386 | 835 | struct lttng_kernel_event_notifier *event_notifier; |
437d5aa5 | 836 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 837 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
0bb716a8 | 838 | struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table; |
606828e4 | 839 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
5b9817ae | 840 | uint64_t user_token = event_notifier_enabler->parent.user_token; |
99f52fcc | 841 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8d554755 | 842 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler( |
8a8ac9a8 FD |
843 | event_notifier_enabler); |
844 | struct hlist_head *unknown_dispatch_list; | |
845 | int ret = 0; | |
846 | bool found = false; | |
606828e4 MD |
847 | enum lttng_kernel_abi_syscall_abi abi; |
848 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
849 | struct hlist_head *head; |
850 | ||
851 | switch (type) { | |
852 | case SC_TYPE_ENTRY: | |
853 | desc = &__event_desc___syscall_entry_unknown; | |
0bb716a8 | 854 | unknown_dispatch_list = &syscall_table->unknown_syscall_dispatch; |
606828e4 MD |
855 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
856 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
857 | break; |
858 | case SC_TYPE_EXIT: | |
859 | desc = &__event_desc___syscall_exit_unknown; | |
0bb716a8 | 860 | unknown_dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; |
606828e4 MD |
861 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
862 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
863 | break; |
864 | case SC_TYPE_COMPAT_ENTRY: | |
865 | desc = &__event_desc___compat_syscall_entry_unknown; | |
0bb716a8 | 866 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; |
606828e4 MD |
867 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
868 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
869 | break; |
870 | case SC_TYPE_COMPAT_EXIT: | |
871 | desc = &__event_desc___compat_syscall_exit_unknown; | |
0bb716a8 | 872 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
606828e4 MD |
873 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
874 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
875 | break; |
876 | default: | |
877 | BUG_ON(1); | |
878 | } | |
879 | ||
880 | /* | |
881 | * Check if already created. | |
882 | */ | |
0def9170 | 883 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 MD |
884 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
885 | if (event_priv->desc == desc && | |
886 | event_priv->user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
887 | found = true; |
888 | } | |
889 | if (found) | |
890 | goto end; | |
891 | ||
892 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 893 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 894 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 895 | |
606828e4 | 896 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 897 | |
606828e4 | 898 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
1bbb5b2d | 899 | event_notifier_param.event.token = user_token; |
8a8ac9a8 FD |
900 | event_notifier_param.event.u.syscall.abi = abi; |
901 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
1bbb5b2d | 902 | event_notifier_param.error_counter_index = error_counter_index; |
8a8ac9a8 | 903 | |
1bbb5b2d MD |
904 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, |
905 | &event_notifier_param, group); | |
906 | WARN_ON_ONCE(!event_notifier_enabler); | |
907 | event_notifier = _lttng_event_notifier_create(event_notifier_enabler, desc); | |
908 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); | |
a67ba386 | 909 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 910 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 911 | desc->event_name); |
8a8ac9a8 FD |
912 | ret = -ENOMEM; |
913 | goto end; | |
914 | } | |
915 | ||
a67ba386 | 916 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
917 | |
918 | end: | |
919 | return ret; | |
920 | } | |
921 | ||
922 | static int create_matching_event_notifiers( | |
1bbb5b2d | 923 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler, |
a67ba386 | 924 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
925 | size_t table_len, enum sc_type type) |
926 | { | |
0def9170 | 927 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&syscall_event_notifier_enabler->parent); |
1bbb5b2d | 928 | struct lttng_event_notifier_group *group = syscall_event_notifier_enabler->group; |
437d5aa5 | 929 | const struct lttng_kernel_event_desc *desc; |
1bbb5b2d MD |
930 | uint64_t user_token = syscall_event_notifier_enabler->parent.user_token; |
931 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
8a8ac9a8 FD |
932 | unsigned int i; |
933 | int ret = 0; | |
934 | ||
935 | /* iterate over all syscall and create event_notifier that match */ | |
936 | for (i = 0; i < table_len; i++) { | |
1bbb5b2d | 937 | struct lttng_event_notifier_enabler *event_notifier_enabler; |
19bef247 | 938 | struct lttng_kernel_event_common_private *event_priv; |
a67ba386 | 939 | struct lttng_kernel_event_notifier *event_notifier; |
606828e4 | 940 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
941 | struct hlist_head *head; |
942 | int found = 0; | |
943 | ||
944 | desc = table[i].desc; | |
945 | if (!desc) { | |
946 | /* Unknown syscall */ | |
947 | continue; | |
948 | } | |
949 | ||
950 | if (!lttng_desc_match_enabler(desc, | |
1bbb5b2d | 951 | lttng_event_notifier_enabler_as_enabler(syscall_event_notifier_enabler))) |
8a8ac9a8 FD |
952 | continue; |
953 | ||
954 | /* | |
955 | * Check if already created. | |
956 | */ | |
0def9170 | 957 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 MD |
958 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
959 | if (event_priv->desc == desc | |
960 | && event_priv->user_token == syscall_event_notifier_enabler->parent.user_token) | |
8a8ac9a8 FD |
961 | found = 1; |
962 | } | |
963 | if (found) | |
964 | continue; | |
965 | ||
966 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
967 | switch (type) { | |
968 | case SC_TYPE_ENTRY: | |
606828e4 MD |
969 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
970 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
971 | break; |
972 | case SC_TYPE_EXIT: | |
606828e4 MD |
973 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
974 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
975 | break; |
976 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
977 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
978 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
979 | break; |
980 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
981 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
982 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
983 | break; |
984 | } | |
437d5aa5 | 985 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
986 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
987 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
988 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1bbb5b2d MD |
989 | event_notifier_param.event.token = user_token; |
990 | event_notifier_param.error_counter_index = error_counter_index; | |
991 | ||
992 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
993 | &event_notifier_param, group); | |
994 | WARN_ON_ONCE(!event_notifier_enabler); | |
995 | event_notifier = _lttng_event_notifier_create(event_notifier_enabler, desc); | |
996 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); | |
8a8ac9a8 FD |
997 | if (IS_ERR(event_notifier)) { |
998 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 999 | desc->event_name); |
8a8ac9a8 FD |
1000 | ret = -ENOMEM; |
1001 | goto end; | |
1002 | } | |
1003 | ||
a67ba386 | 1004 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1005 | } |
1006 | ||
1007 | end: | |
1008 | return ret; | |
1009 | ||
1010 | } | |
1011 | ||
0fab709d MD |
1012 | static |
1013 | int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 FD |
1014 | { |
1015 | int ret; | |
606828e4 | 1016 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
0fab709d MD |
1017 | event_enabler->event_param.u.syscall.entryexit; |
1018 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1019 | ||
1020 | if (event_enabler->enabler_type != LTTNG_EVENT_ENABLER_TYPE_NOTIFIER) | |
1021 | return 0; | |
1022 | event_notifier_enabler = container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
8a8ac9a8 | 1023 | |
606828e4 | 1024 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1025 | ret = create_matching_event_notifiers(event_notifier_enabler, |
ebcc64cd | 1026 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1027 | if (ret) |
1028 | goto end; | |
1029 | ||
1030 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
ebcc64cd | 1031 | compat_sc_table.table, compat_sc_table.len, |
8a8ac9a8 FD |
1032 | SC_TYPE_COMPAT_ENTRY); |
1033 | if (ret) | |
1034 | goto end; | |
1035 | ||
1036 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1037 | SC_TYPE_ENTRY); | |
1038 | if (ret) | |
1039 | goto end; | |
1040 | ||
1041 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1042 | SC_TYPE_COMPAT_ENTRY); | |
1043 | if (ret) | |
1044 | goto end; | |
1045 | } | |
1046 | ||
606828e4 | 1047 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1048 | ret = create_matching_event_notifiers(event_notifier_enabler, |
ebcc64cd | 1049 | sc_exit_table.table, sc_exit_table.len, |
8a8ac9a8 FD |
1050 | SC_TYPE_EXIT); |
1051 | if (ret) | |
1052 | goto end; | |
1053 | ||
1054 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1055 | SC_TYPE_EXIT); | |
1056 | if (ret) | |
1057 | goto end; | |
1058 | ||
1059 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
ebcc64cd | 1060 | compat_sc_exit_table.table, compat_sc_exit_table.len, |
8a8ac9a8 FD |
1061 | SC_TYPE_COMPAT_EXIT); |
1062 | if (ret) | |
1063 | goto end; | |
1064 | ||
1065 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1066 | SC_TYPE_COMPAT_EXIT); | |
1067 | if (ret) | |
1068 | goto end; | |
1069 | } | |
1070 | ||
1071 | end: | |
1072 | return ret; | |
1073 | } | |
1074 | ||
6053e75e | 1075 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
1076 | { |
1077 | int ret; | |
1078 | ||
0bb716a8 | 1079 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 1080 | return 0; |
0bb716a8 | 1081 | if (syscall_table->sys_enter_registered) { |
2d9cd7f3 | 1082 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 1083 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
1084 | if (ret) |
1085 | return ret; | |
0bb716a8 | 1086 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 1087 | } |
0bb716a8 | 1088 | if (syscall_table->sys_exit_registered) { |
2d9cd7f3 | 1089 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 1090 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
1091 | if (ret) |
1092 | return ret; | |
0bb716a8 | 1093 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 1094 | } |
badfe9f5 MD |
1095 | return 0; |
1096 | } | |
1097 | ||
6053e75e | 1098 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 1099 | { |
0bb716a8 MD |
1100 | kfree(syscall_table->syscall_dispatch); |
1101 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 1102 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
1103 | kfree(syscall_table->compat_syscall_dispatch); |
1104 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 1105 | #endif |
0bb716a8 | 1106 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
1107 | return 0; |
1108 | } | |
1109 | ||
1110 | static | |
1111 | int get_syscall_nr(const char *syscall_name) | |
1112 | { | |
1113 | int syscall_nr = -1; | |
1114 | int i; | |
1115 | ||
ebcc64cd | 1116 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 1117 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1118 | const char *it_name; |
80f87dd2 | 1119 | |
ebcc64cd | 1120 | entry = &sc_table.table[i]; |
80f87dd2 MD |
1121 | if (!entry->desc) |
1122 | continue; | |
437d5aa5 | 1123 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1124 | it_name += strlen(SYSCALL_ENTRY_STR); |
1125 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1126 | syscall_nr = i; |
1127 | break; | |
1128 | } | |
1129 | } | |
1130 | return syscall_nr; | |
1131 | } | |
1132 | ||
1133 | static | |
1134 | int get_compat_syscall_nr(const char *syscall_name) | |
1135 | { | |
1136 | int syscall_nr = -1; | |
1137 | int i; | |
1138 | ||
ebcc64cd | 1139 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 1140 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1141 | const char *it_name; |
80f87dd2 | 1142 | |
ebcc64cd | 1143 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
1144 | if (!entry->desc) |
1145 | continue; | |
437d5aa5 | 1146 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1147 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1148 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1149 | syscall_nr = i; |
1150 | break; | |
1151 | } | |
1152 | } | |
1153 | return syscall_nr; | |
1154 | } | |
1155 | ||
12e579db MD |
1156 | static |
1157 | uint32_t get_sc_tables_len(void) | |
1158 | { | |
ebcc64cd | 1159 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
1160 | } |
1161 | ||
badfe9f5 | 1162 | static |
ade8a729 FD |
1163 | const char *get_syscall_name(const char *desc_name, |
1164 | enum lttng_syscall_abi abi, | |
1165 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1166 | { |
badfe9f5 | 1167 | size_t prefix_len = 0; |
80f87dd2 | 1168 | |
80f87dd2 | 1169 | |
ade8a729 | 1170 | switch (entryexit) { |
badfe9f5 | 1171 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1172 | switch (abi) { |
badfe9f5 MD |
1173 | case LTTNG_SYSCALL_ABI_NATIVE: |
1174 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1175 | break; | |
1176 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1177 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1178 | break; | |
80f87dd2 | 1179 | } |
badfe9f5 MD |
1180 | break; |
1181 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1182 | switch (abi) { |
badfe9f5 MD |
1183 | case LTTNG_SYSCALL_ABI_NATIVE: |
1184 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1185 | break; | |
1186 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1187 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1188 | break; | |
80f87dd2 | 1189 | } |
badfe9f5 | 1190 | break; |
80f87dd2 | 1191 | } |
badfe9f5 | 1192 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1193 | return desc_name + prefix_len; |
badfe9f5 MD |
1194 | } |
1195 | ||
ade8a729 FD |
1196 | static |
1197 | int lttng_syscall_filter_enable( | |
1198 | struct lttng_syscall_filter *filter, | |
1199 | const char *desc_name, enum lttng_syscall_abi abi, | |
1200 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1201 | { |
badfe9f5 MD |
1202 | const char *syscall_name; |
1203 | unsigned long *bitmap; | |
1204 | int syscall_nr; | |
1205 | ||
ade8a729 | 1206 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1207 | |
ade8a729 | 1208 | switch (abi) { |
badfe9f5 MD |
1209 | case LTTNG_SYSCALL_ABI_NATIVE: |
1210 | syscall_nr = get_syscall_nr(syscall_name); | |
1211 | break; | |
1212 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1213 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1214 | break; | |
1215 | default: | |
1216 | return -EINVAL; | |
80f87dd2 | 1217 | } |
badfe9f5 MD |
1218 | if (syscall_nr < 0) |
1219 | return -ENOENT; | |
1220 | ||
ade8a729 | 1221 | switch (entryexit) { |
badfe9f5 | 1222 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1223 | switch (abi) { |
badfe9f5 MD |
1224 | case LTTNG_SYSCALL_ABI_NATIVE: |
1225 | bitmap = filter->sc_entry; | |
1226 | break; | |
1227 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1228 | bitmap = filter->sc_compat_entry; | |
1229 | break; | |
6d9694d8 MD |
1230 | default: |
1231 | return -EINVAL; | |
80f87dd2 | 1232 | } |
badfe9f5 MD |
1233 | break; |
1234 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1235 | switch (abi) { |
badfe9f5 MD |
1236 | case LTTNG_SYSCALL_ABI_NATIVE: |
1237 | bitmap = filter->sc_exit; | |
1238 | break; | |
1239 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1240 | bitmap = filter->sc_compat_exit; | |
1241 | break; | |
6d9694d8 MD |
1242 | default: |
1243 | return -EINVAL; | |
80f87dd2 | 1244 | } |
badfe9f5 MD |
1245 | break; |
1246 | default: | |
1247 | return -EINVAL; | |
80f87dd2 | 1248 | } |
badfe9f5 MD |
1249 | if (test_bit(syscall_nr, bitmap)) |
1250 | return -EEXIST; | |
1251 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1252 | return 0; |
80f87dd2 MD |
1253 | } |
1254 | ||
9b2f1c54 | 1255 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1256 | { |
9b2f1c54 MD |
1257 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
1258 | int ret; | |
8a8ac9a8 | 1259 | |
9b2f1c54 | 1260 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1261 | |
0bb716a8 | 1262 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, |
9b2f1c54 MD |
1263 | event->priv->desc->event_name, event->priv->u.syscall.abi, |
1264 | event->priv->u.syscall.entryexit); | |
1265 | if (ret) | |
1266 | return ret; | |
8a8ac9a8 | 1267 | |
9b2f1c54 MD |
1268 | switch (event->type) { |
1269 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
8a8ac9a8 | 1270 | break; |
9b2f1c54 MD |
1271 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: |
1272 | { | |
1273 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; | |
1274 | struct hlist_head *dispatch_list; | |
1275 | ||
1276 | switch (event->priv->u.syscall.entryexit) { | |
1277 | case LTTNG_SYSCALL_ENTRY: | |
1278 | switch (event->priv->u.syscall.abi) { | |
1279 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1280 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1281 | break; | |
1282 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1283 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1284 | break; | |
1285 | default: | |
1286 | ret = -EINVAL; | |
1287 | goto end; | |
1288 | } | |
8a8ac9a8 | 1289 | break; |
9b2f1c54 MD |
1290 | case LTTNG_SYSCALL_EXIT: |
1291 | switch (event->priv->u.syscall.abi) { | |
1292 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1293 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1294 | break; | |
1295 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1296 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1297 | break; | |
1298 | default: | |
1299 | ret = -EINVAL; | |
1300 | goto end; | |
1301 | } | |
8a8ac9a8 | 1302 | break; |
6866b1c7 MJ |
1303 | default: |
1304 | ret = -EINVAL; | |
1305 | goto end; | |
8a8ac9a8 | 1306 | } |
9b2f1c54 MD |
1307 | |
1308 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1309 | break; |
9b2f1c54 | 1310 | } |
6866b1c7 | 1311 | default: |
9b2f1c54 MD |
1312 | WARN_ON_ONCE(1); |
1313 | return -ENOSYS; | |
8a8ac9a8 | 1314 | } |
8a8ac9a8 | 1315 | end: |
9b2f1c54 | 1316 | return ret; |
ade8a729 FD |
1317 | } |
1318 | ||
1319 | static | |
f2db8be3 | 1320 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 FD |
1321 | const char *desc_name, enum lttng_syscall_abi abi, |
1322 | enum lttng_syscall_entryexit entryexit) | |
1323 | { | |
badfe9f5 MD |
1324 | const char *syscall_name; |
1325 | unsigned long *bitmap; | |
1326 | int syscall_nr; | |
80f87dd2 | 1327 | |
ade8a729 | 1328 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1329 | |
ade8a729 | 1330 | switch (abi) { |
badfe9f5 MD |
1331 | case LTTNG_SYSCALL_ABI_NATIVE: |
1332 | syscall_nr = get_syscall_nr(syscall_name); | |
1333 | break; | |
1334 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1335 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1336 | break; | |
1337 | default: | |
1338 | return -EINVAL; | |
80f87dd2 | 1339 | } |
badfe9f5 MD |
1340 | if (syscall_nr < 0) |
1341 | return -ENOENT; | |
80f87dd2 | 1342 | |
ade8a729 | 1343 | switch (entryexit) { |
badfe9f5 | 1344 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1345 | switch (abi) { |
badfe9f5 MD |
1346 | case LTTNG_SYSCALL_ABI_NATIVE: |
1347 | bitmap = filter->sc_entry; | |
1348 | break; | |
1349 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1350 | bitmap = filter->sc_compat_entry; | |
1351 | break; | |
6d9694d8 MD |
1352 | default: |
1353 | return -EINVAL; | |
80f87dd2 | 1354 | } |
badfe9f5 MD |
1355 | break; |
1356 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1357 | switch (abi) { |
badfe9f5 MD |
1358 | case LTTNG_SYSCALL_ABI_NATIVE: |
1359 | bitmap = filter->sc_exit; | |
1360 | break; | |
1361 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1362 | bitmap = filter->sc_compat_exit; | |
1363 | break; | |
6d9694d8 MD |
1364 | default: |
1365 | return -EINVAL; | |
80f87dd2 | 1366 | } |
badfe9f5 MD |
1367 | break; |
1368 | default: | |
1369 | return -EINVAL; | |
80f87dd2 | 1370 | } |
badfe9f5 MD |
1371 | if (!test_bit(syscall_nr, bitmap)) |
1372 | return -EEXIST; | |
1373 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1374 | |
badfe9f5 | 1375 | return 0; |
259b6cb3 | 1376 | } |
2d2464bd | 1377 | |
9b2f1c54 | 1378 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1379 | { |
9b2f1c54 | 1380 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
8a8ac9a8 FD |
1381 | int ret; |
1382 | ||
0bb716a8 | 1383 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, |
9b2f1c54 MD |
1384 | event->priv->desc->event_name, event->priv->u.syscall.abi, |
1385 | event->priv->u.syscall.entryexit); | |
1386 | if (ret) | |
1387 | return ret; | |
8a8ac9a8 | 1388 | |
9b2f1c54 MD |
1389 | switch (event->type) { |
1390 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
1391 | break; | |
1392 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
1393 | { | |
1394 | hlist_del_rcu(&event->priv->u.syscall.node); | |
1395 | break; | |
1396 | } | |
1397 | default: | |
1398 | WARN_ON_ONCE(1); | |
1399 | return -ENOSYS; | |
1400 | } | |
8a8ac9a8 FD |
1401 | return 0; |
1402 | } | |
1403 | ||
2d2464bd MD |
1404 | static |
1405 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1406 | { | |
1407 | const struct trace_syscall_entry *entry; | |
1408 | int iter = 0; | |
1409 | ||
ebcc64cd FD |
1410 | for (entry = sc_table.table; |
1411 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1412 | entry++) { |
1413 | if (iter++ >= *pos) | |
1414 | return entry; | |
1415 | } | |
ebcc64cd FD |
1416 | for (entry = compat_sc_table.table; |
1417 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1418 | entry++) { |
1419 | if (iter++ >= *pos) | |
1420 | return entry; | |
1421 | } | |
1422 | /* End of list */ | |
1423 | return NULL; | |
1424 | } | |
1425 | ||
1426 | static | |
1427 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1428 | { | |
1429 | return (void *) syscall_list_get_entry(pos); | |
1430 | } | |
1431 | ||
1432 | static | |
1433 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1434 | { | |
1435 | (*ppos)++; | |
1436 | return (void *) syscall_list_get_entry(ppos); | |
1437 | } | |
1438 | ||
1439 | static | |
1440 | void syscall_list_stop(struct seq_file *m, void *p) | |
1441 | { | |
1442 | } | |
1443 | ||
12e579db MD |
1444 | static |
1445 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1446 | const struct trace_syscall_entry **table, | |
1447 | unsigned int *bitness) | |
1448 | { | |
ebcc64cd | 1449 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1450 | if (bitness) |
1451 | *bitness = BITS_PER_LONG; | |
1452 | if (table) | |
ebcc64cd | 1453 | *table = sc_table.table; |
12e579db MD |
1454 | return 0; |
1455 | } | |
ebcc64cd FD |
1456 | if (!(entry >= compat_sc_table.table |
1457 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1458 | return -EINVAL; |
1459 | } | |
1460 | if (bitness) | |
1461 | *bitness = 32; | |
1462 | if (table) | |
ebcc64cd | 1463 | *table = compat_sc_table.table; |
12e579db MD |
1464 | return 0; |
1465 | } | |
1466 | ||
2d2464bd MD |
1467 | static |
1468 | int syscall_list_show(struct seq_file *m, void *p) | |
1469 | { | |
1470 | const struct trace_syscall_entry *table, *entry = p; | |
1471 | unsigned int bitness; | |
d4291869 | 1472 | unsigned long index; |
12e579db | 1473 | int ret; |
d4291869 | 1474 | const char *name; |
2d2464bd | 1475 | |
12e579db MD |
1476 | ret = get_sc_table(entry, &table, &bitness); |
1477 | if (ret) | |
1478 | return ret; | |
f4855b46 MD |
1479 | if (!entry->desc) |
1480 | return 0; | |
ebcc64cd | 1481 | if (table == sc_table.table) { |
d4291869 | 1482 | index = entry - table; |
437d5aa5 | 1483 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1484 | } else { |
ebcc64cd | 1485 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1486 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1487 | } |
12e579db | 1488 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1489 | index, name, bitness); |
2d2464bd MD |
1490 | return 0; |
1491 | } | |
1492 | ||
1493 | static | |
1494 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1495 | .start = syscall_list_start, | |
1496 | .next = syscall_list_next, | |
1497 | .stop = syscall_list_stop, | |
1498 | .show = syscall_list_show, | |
1499 | }; | |
1500 | ||
1501 | static | |
1502 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1503 | { | |
1504 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1505 | } | |
1506 | ||
1507 | const struct file_operations lttng_syscall_list_fops = { | |
1508 | .owner = THIS_MODULE, | |
1509 | .open = lttng_syscall_list_open, | |
1510 | .read = seq_read, | |
1511 | .llseek = seq_lseek, | |
1512 | .release = seq_release, | |
1513 | }; | |
12e579db | 1514 | |
badfe9f5 MD |
1515 | /* |
1516 | * A syscall is enabled if it is traced for either entry or exit. | |
1517 | */ | |
c970b655 | 1518 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1519 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1520 | { |
1521 | uint32_t len, sc_tables_len, bitmask_len; | |
1522 | int ret = 0, bit; | |
1523 | char *tmp_mask; | |
1524 | struct lttng_syscall_filter *filter; | |
1525 | ||
1526 | ret = get_user(len, &usyscall_mask->len); | |
1527 | if (ret) | |
1528 | return ret; | |
1529 | sc_tables_len = get_sc_tables_len(); | |
1530 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1531 | if (len < sc_tables_len) { | |
1532 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1533 | } | |
1534 | /* Array is large enough, we can copy array to user-space. */ | |
1535 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1536 | if (!tmp_mask) | |
1537 | return -ENOMEM; | |
0bb716a8 | 1538 | filter = syscall_table->sc_filter; |
12e579db | 1539 | |
ebcc64cd | 1540 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1541 | char state; |
2f25059d | 1542 | |
0bb716a8 MD |
1543 | if (syscall_table->syscall_dispatch) { |
1544 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1545 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1546 | state = test_bit(bit, filter->sc_entry) |
1547 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1548 | else |
1549 | state = 1; | |
1550 | } else { | |
1551 | state = 0; | |
1552 | } | |
1553 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1554 | } |
1555 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1556 | char state; |
2f25059d | 1557 | |
0bb716a8 MD |
1558 | if (syscall_table->compat_syscall_dispatch) { |
1559 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1560 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1561 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1562 | filter->sc_compat_entry) |
ebcc64cd | 1563 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1564 | filter->sc_compat_exit); |
2f25059d MD |
1565 | else |
1566 | state = 1; | |
1567 | } else { | |
1568 | state = 0; | |
1569 | } | |
1570 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1571 | } |
1572 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1573 | ret = -EFAULT; | |
1574 | kfree(tmp_mask); | |
1575 | return ret; | |
1576 | } | |
082d4946 MD |
1577 | |
1578 | int lttng_abi_syscall_list(void) | |
1579 | { | |
1580 | struct file *syscall_list_file; | |
1581 | int file_fd, ret; | |
1582 | ||
4ac10b76 | 1583 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1584 | if (file_fd < 0) { |
1585 | ret = file_fd; | |
1586 | goto fd_error; | |
1587 | } | |
1588 | ||
1589 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1590 | <tng_syscall_list_fops, | |
1591 | NULL, O_RDWR); | |
1592 | if (IS_ERR(syscall_list_file)) { | |
1593 | ret = PTR_ERR(syscall_list_file); | |
1594 | goto file_error; | |
1595 | } | |
1596 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1597 | if (ret < 0) | |
1598 | goto open_error; | |
1599 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1600 | return file_fd; |
1601 | ||
1602 | open_error: | |
1603 | fput(syscall_list_file); | |
1604 | file_error: | |
1605 | put_unused_fd(file_fd); | |
1606 | fd_error: | |
1607 | return ret; | |
1608 | } |