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 | ||
3b82c4e1 | 135 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 136 | struct pt_regs *regs, long id) |
f405cfce | 137 | { |
1b7b9c65 | 138 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 139 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 140 | |
1b7b9c65 | 141 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 142 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 143 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 144 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 145 | else |
e2d5dbc7 | 146 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
147 | } |
148 | } | |
149 | ||
63aa9160 | 150 | static __always_inline |
e2d5dbc7 | 151 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 152 | void *func, unsigned int nrargs, |
63aa9160 | 153 | struct pt_regs *regs) |
259b6cb3 | 154 | { |
a67ba386 | 155 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 156 | |
63aa9160 | 157 | switch (nrargs) { |
259b6cb3 MD |
158 | case 0: |
159 | { | |
63aa9160 | 160 | void (*fptr)(void *__data) = func; |
259b6cb3 | 161 | |
e2d5dbc7 MD |
162 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
163 | fptr(event_priv->pub); | |
259b6cb3 MD |
164 | break; |
165 | } | |
166 | case 1: | |
167 | { | |
63aa9160 | 168 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 169 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 170 | |
1b7b9c65 | 171 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
172 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
173 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
174 | break; |
175 | } | |
176 | case 2: | |
177 | { | |
178 | void (*fptr)(void *__data, | |
179 | unsigned long arg0, | |
63aa9160 | 180 | unsigned long arg1) = func; |
1b7b9c65 | 181 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 182 | |
1b7b9c65 | 183 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
184 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
185 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
186 | break; |
187 | } | |
188 | case 3: | |
189 | { | |
190 | void (*fptr)(void *__data, | |
191 | unsigned long arg0, | |
192 | unsigned long arg1, | |
63aa9160 | 193 | unsigned long arg2) = func; |
1b7b9c65 | 194 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 195 | |
1b7b9c65 | 196 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
197 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
198 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
199 | break; |
200 | } | |
201 | case 4: | |
202 | { | |
203 | void (*fptr)(void *__data, | |
204 | unsigned long arg0, | |
205 | unsigned long arg1, | |
206 | unsigned long arg2, | |
63aa9160 | 207 | unsigned long arg3) = func; |
1b7b9c65 | 208 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 209 | |
1b7b9c65 | 210 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
211 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
212 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
213 | break; |
214 | } | |
215 | case 5: | |
216 | { | |
217 | void (*fptr)(void *__data, | |
218 | unsigned long arg0, | |
219 | unsigned long arg1, | |
220 | unsigned long arg2, | |
221 | unsigned long arg3, | |
63aa9160 | 222 | unsigned long arg4) = func; |
1b7b9c65 | 223 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 224 | |
1b7b9c65 | 225 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
226 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
227 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
228 | break; |
229 | } | |
230 | case 6: | |
231 | { | |
232 | void (*fptr)(void *__data, | |
233 | unsigned long arg0, | |
234 | unsigned long arg1, | |
235 | unsigned long arg2, | |
236 | unsigned long arg3, | |
237 | unsigned long arg4, | |
63aa9160 | 238 | unsigned long arg5) = func; |
1b7b9c65 | 239 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 240 | |
1b7b9c65 | 241 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
242 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
243 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 244 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
245 | break; |
246 | } | |
247 | default: | |
248 | break; | |
249 | } | |
250 | } | |
251 | ||
63aa9160 FD |
252 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
253 | { | |
0bb716a8 | 254 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 255 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
256 | const struct trace_syscall_entry *table, *entry; |
257 | size_t table_len; | |
258 | ||
259 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 260 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
261 | |
262 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 263 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
264 | /* System call filtered out. */ |
265 | return; | |
266 | } | |
ebcc64cd FD |
267 | table = compat_sc_table.table; |
268 | table_len = compat_sc_table.len; | |
0bb716a8 | 269 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 270 | } else { |
0bb716a8 | 271 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
272 | |
273 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 274 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
275 | /* System call filtered out. */ |
276 | return; | |
277 | } | |
ebcc64cd FD |
278 | table = sc_table.table; |
279 | table_len = sc_table.len; | |
0bb716a8 | 280 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
281 | } |
282 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 283 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
284 | return; |
285 | } | |
3b82c4e1 MD |
286 | |
287 | entry = &table[id]; | |
288 | if (!entry->event_func) { | |
289 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
290 | return; |
291 | } | |
3b82c4e1 MD |
292 | |
293 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 294 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 295 | } else { |
0bb716a8 | 296 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
297 | } |
298 | if (unlikely(hlist_empty(action_list))) | |
299 | return; | |
300 | ||
e2d5dbc7 | 301 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
302 | } |
303 | ||
3b82c4e1 | 304 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 305 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 306 | { |
1b7b9c65 | 307 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 308 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 309 | |
1b7b9c65 | 310 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 311 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 312 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 313 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
314 | args); |
315 | else | |
e2d5dbc7 | 316 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 317 | } |
5b7ac358 MD |
318 | } |
319 | ||
3b82c4e1 | 320 | static __always_inline |
e2d5dbc7 | 321 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
322 | void *func, unsigned int nrargs, |
323 | struct pt_regs *regs, long ret) | |
5b7ac358 | 324 | { |
a67ba386 | 325 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 326 | |
3b82c4e1 | 327 | switch (nrargs) { |
5b7ac358 MD |
328 | case 0: |
329 | { | |
3b82c4e1 | 330 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 331 | |
e2d5dbc7 MD |
332 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
333 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
334 | break; |
335 | } | |
336 | case 1: | |
337 | { | |
338 | void (*fptr)(void *__data, | |
fc4f7161 | 339 | long ret, |
3b82c4e1 | 340 | unsigned long arg0) = func; |
1b7b9c65 | 341 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 342 | |
1b7b9c65 | 343 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
344 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
345 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
346 | break; |
347 | } | |
348 | case 2: | |
349 | { | |
350 | void (*fptr)(void *__data, | |
fc4f7161 | 351 | long ret, |
5b7ac358 | 352 | unsigned long arg0, |
3b82c4e1 | 353 | unsigned long arg1) = func; |
1b7b9c65 | 354 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 355 | |
1b7b9c65 | 356 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
357 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
358 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
359 | break; |
360 | } | |
361 | case 3: | |
362 | { | |
363 | void (*fptr)(void *__data, | |
fc4f7161 | 364 | long ret, |
5b7ac358 MD |
365 | unsigned long arg0, |
366 | unsigned long arg1, | |
3b82c4e1 | 367 | unsigned long arg2) = func; |
1b7b9c65 | 368 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 369 | |
1b7b9c65 | 370 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
371 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
372 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
373 | break; |
374 | } | |
375 | case 4: | |
376 | { | |
377 | void (*fptr)(void *__data, | |
fc4f7161 | 378 | long ret, |
5b7ac358 MD |
379 | unsigned long arg0, |
380 | unsigned long arg1, | |
381 | unsigned long arg2, | |
3b82c4e1 | 382 | unsigned long arg3) = func; |
1b7b9c65 | 383 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 384 | |
1b7b9c65 | 385 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
386 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
387 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
388 | break; |
389 | } | |
390 | case 5: | |
391 | { | |
392 | void (*fptr)(void *__data, | |
fc4f7161 | 393 | long ret, |
5b7ac358 MD |
394 | unsigned long arg0, |
395 | unsigned long arg1, | |
396 | unsigned long arg2, | |
397 | unsigned long arg3, | |
3b82c4e1 | 398 | unsigned long arg4) = func; |
1b7b9c65 | 399 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 400 | |
1b7b9c65 | 401 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
402 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
403 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
404 | break; |
405 | } | |
406 | case 6: | |
407 | { | |
408 | void (*fptr)(void *__data, | |
fc4f7161 | 409 | long ret, |
5b7ac358 MD |
410 | unsigned long arg0, |
411 | unsigned long arg1, | |
412 | unsigned long arg2, | |
413 | unsigned long arg3, | |
414 | unsigned long arg4, | |
3b82c4e1 | 415 | unsigned long arg5) = func; |
1b7b9c65 | 416 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 417 | |
1b7b9c65 | 418 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
419 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
420 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 421 | args[3], args[4], args[5]); |
5b7ac358 MD |
422 | break; |
423 | } | |
424 | default: | |
425 | break; | |
426 | } | |
427 | } | |
428 | ||
3b82c4e1 MD |
429 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
430 | { | |
0bb716a8 | 431 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
432 | struct hlist_head *action_list, *unknown_action_list; |
433 | const struct trace_syscall_entry *table, *entry; | |
434 | size_t table_len; | |
435 | long id; | |
436 | ||
437 | id = syscall_get_nr(current, regs); | |
438 | ||
439 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 440 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
441 | |
442 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 443 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
444 | /* System call filtered out. */ |
445 | return; | |
446 | } | |
ebcc64cd FD |
447 | table = compat_sc_exit_table.table; |
448 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 449 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 450 | } else { |
0bb716a8 | 451 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
452 | |
453 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 454 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
455 | /* System call filtered out. */ |
456 | return; | |
457 | } | |
ebcc64cd FD |
458 | table = sc_exit_table.table; |
459 | table_len = sc_exit_table.len; | |
0bb716a8 | 460 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
461 | } |
462 | if (unlikely(id < 0 || id >= table_len)) { | |
463 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
464 | return; | |
465 | } | |
466 | ||
467 | entry = &table[id]; | |
468 | if (!entry->event_func) { | |
469 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
470 | return; | |
471 | } | |
472 | ||
473 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 474 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 475 | } else { |
0bb716a8 | 476 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
477 | } |
478 | if (unlikely(hlist_empty(action_list))) | |
479 | return; | |
480 | ||
e2d5dbc7 | 481 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
482 | regs, ret); |
483 | } | |
484 | ||
0bb716a8 MD |
485 | static |
486 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 487 | { |
0bb716a8 MD |
488 | switch (event_enabler->enabler_type) { |
489 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
490 | { | |
1ae083ba MD |
491 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
492 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 493 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 494 | } |
0bb716a8 MD |
495 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
496 | { | |
497 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
498 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
499 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 500 | } |
0bb716a8 MD |
501 | default: |
502 | return NULL; | |
8a8ac9a8 | 503 | } |
0bb716a8 | 504 | } |
8a8ac9a8 | 505 | |
0bb716a8 MD |
506 | static |
507 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
508 | { | |
509 | switch (event->type) { | |
510 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
511 | { | |
512 | struct lttng_kernel_event_recorder *event_recorder = | |
513 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
514 | return &event_recorder->chan->priv->parent.syscall_table; | |
515 | } | |
516 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
517 | { | |
518 | struct lttng_kernel_event_notifier *event_notifier = | |
519 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
520 | return &event_notifier->priv->group->syscall_table; | |
521 | } | |
522 | default: | |
523 | return NULL; | |
8a8ac9a8 | 524 | } |
8a8ac9a8 | 525 | } |
0bb716a8 | 526 | |
33a39a3c MD |
527 | /* |
528 | * noinline to diminish caller stack size. | |
529 | * Should be called with sessions lock held. | |
530 | */ | |
49c50022 | 531 | static |
3b82c4e1 | 532 | int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, |
1ae083ba | 533 | struct hlist_head *chan_table, struct lttng_event_recorder_enabler *syscall_event_enabler, |
a67ba386 | 534 | enum sc_type type) |
259b6cb3 | 535 | { |
0bb716a8 | 536 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(&syscall_event_enabler->parent); |
def1e304 | 537 | struct lttng_kernel_channel_buffer *chan = syscall_event_enabler->chan; |
f7d06400 | 538 | struct lttng_kernel_session *session = chan->parent.session; |
259b6cb3 | 539 | unsigned int i; |
49c50022 | 540 | |
3b82c4e1 | 541 | /* Allocate events for each syscall matching enabler, insert into table */ |
49c50022 | 542 | for (i = 0; i < table_len; i++) { |
437d5aa5 | 543 | const struct lttng_kernel_event_desc *desc = table[i].desc; |
1ae083ba | 544 | struct lttng_event_recorder_enabler *event_enabler; |
606828e4 | 545 | struct lttng_kernel_abi_event ev; |
a67ba386 MD |
546 | struct lttng_kernel_event_recorder_private *event_recorder_priv; |
547 | struct lttng_kernel_event_recorder *event_recorder; | |
3b82c4e1 MD |
548 | struct hlist_head *head; |
549 | bool found = false; | |
49c50022 MD |
550 | |
551 | if (!desc) { | |
552 | /* Unknown syscall */ | |
553 | continue; | |
554 | } | |
3b82c4e1 | 555 | if (lttng_desc_match_enabler(desc, |
1ae083ba | 556 | lttng_event_recorder_enabler_as_enabler(syscall_event_enabler)) <= 0) |
3b82c4e1 | 557 | continue; |
49c50022 | 558 | /* |
3b82c4e1 | 559 | * Check if already created. |
49c50022 | 560 | */ |
3b82c4e1 | 561 | head = utils_borrow_hash_table_bucket( |
8cdc1a81 | 562 | session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE, |
437d5aa5 | 563 | desc->event_name); |
a67ba386 MD |
564 | lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) { |
565 | if (event_recorder_priv->parent.desc == desc | |
0bb716a8 | 566 | && get_syscall_table_from_event(event_recorder_priv->parent.pub) == syscall_table) |
3b82c4e1 MD |
567 | found = true; |
568 | } | |
569 | if (found) | |
49c50022 | 570 | continue; |
3b82c4e1 MD |
571 | |
572 | /* We need to create an event for this syscall/enabler. */ | |
49c50022 | 573 | memset(&ev, 0, sizeof(ev)); |
5b7ac358 MD |
574 | switch (type) { |
575 | case SC_TYPE_ENTRY: | |
606828e4 MD |
576 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
577 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
578 | break; |
579 | case SC_TYPE_EXIT: | |
606828e4 MD |
580 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
581 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
5b7ac358 MD |
582 | break; |
583 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
584 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
585 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
586 | break; |
587 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
588 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
589 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
5b7ac358 MD |
590 | break; |
591 | } | |
606828e4 MD |
592 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); |
593 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
594 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
1ae083ba | 595 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); |
def1e304 MD |
596 | if (!event_enabler) { |
597 | return -ENOMEM; | |
598 | } | |
599 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 600 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 601 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 | 602 | if (IS_ERR(event_recorder)) { |
49c50022 MD |
603 | /* |
604 | * If something goes wrong in event registration | |
605 | * after the first one, we have no choice but to | |
606 | * leave the previous events in there, until | |
607 | * deleted by session teardown. | |
608 | */ | |
a67ba386 | 609 | return PTR_ERR(event_recorder); |
49c50022 | 610 | } |
a67ba386 | 611 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]); |
49c50022 MD |
612 | } |
613 | return 0; | |
614 | } | |
615 | ||
33a39a3c MD |
616 | /* |
617 | * Should be called with sessions lock held. | |
618 | */ | |
1ae083ba | 619 | int lttng_syscalls_register_event(struct lttng_event_recorder_enabler *syscall_event_enabler) |
49c50022 | 620 | { |
0bb716a8 | 621 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(&syscall_event_enabler->parent); |
606828e4 | 622 | struct lttng_kernel_abi_event ev; |
259b6cb3 MD |
623 | int ret; |
624 | ||
263b6c88 | 625 | wrapper_vmalloc_sync_mappings(); |
259b6cb3 | 626 | |
0bb716a8 | 627 | if (!syscall_table->syscall_dispatch) { |
259b6cb3 | 628 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
629 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
630 | if (!syscall_table->syscall_dispatch) | |
259b6cb3 MD |
631 | return -ENOMEM; |
632 | } | |
0bb716a8 | 633 | if (!syscall_table->syscall_exit_dispatch) { |
5b7ac358 | 634 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
635 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); |
636 | if (!syscall_table->syscall_exit_dispatch) | |
5b7ac358 MD |
637 | return -ENOMEM; |
638 | } | |
639 | ||
259b6cb3 | 640 | |
49c50022 | 641 | #ifdef CONFIG_COMPAT |
0bb716a8 | 642 | if (!syscall_table->compat_syscall_dispatch) { |
49c50022 | 643 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
644 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
645 | if (!syscall_table->compat_syscall_dispatch) | |
49c50022 MD |
646 | return -ENOMEM; |
647 | } | |
5b7ac358 | 648 | |
0bb716a8 | 649 | if (!syscall_table->compat_syscall_exit_dispatch) { |
5b7ac358 | 650 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
651 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); |
652 | if (!syscall_table->compat_syscall_exit_dispatch) | |
5b7ac358 MD |
653 | return -ENOMEM; |
654 | } | |
49c50022 | 655 | #endif |
0bb716a8 | 656 | if (hlist_empty(&syscall_table->unknown_syscall_dispatch)) { |
437d5aa5 | 657 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 658 | &__event_desc___syscall_entry_unknown; |
a67ba386 | 659 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 660 | struct lttng_event_recorder_enabler *event_enabler; |
2f804c0a | 661 | |
f405cfce | 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_NATIVE; | |
1ae083ba | 668 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, syscall_event_enabler->chan); |
def1e304 MD |
669 | if (!event_enabler) { |
670 | return -ENOMEM; | |
671 | } | |
672 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
44b1abdc | 673 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
674 | WARN_ON_ONCE(!event_recorder); |
675 | if (IS_ERR(event_recorder)) { | |
676 | return PTR_ERR(event_recorder); | |
f405cfce | 677 | } |
0bb716a8 | 678 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->unknown_syscall_dispatch); |
f405cfce MD |
679 | } |
680 | ||
0bb716a8 | 681 | if (hlist_empty(&syscall_table->compat_unknown_syscall_dispatch)) { |
437d5aa5 | 682 | const struct lttng_kernel_event_desc *desc = |
d4291869 | 683 | &__event_desc___compat_syscall_entry_unknown; |
a67ba386 | 684 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 685 | struct lttng_event_recorder_enabler *event_enabler; |
b76dc1a0 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_ENTRY; | |
692 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
1ae083ba | 693 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, syscall_event_enabler->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); | |
b76dc1a0 | 702 | } |
0bb716a8 | 703 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->compat_unknown_syscall_dispatch); |
b76dc1a0 MD |
704 | } |
705 | ||
0bb716a8 | 706 | if (hlist_empty(&syscall_table->compat_unknown_syscall_exit_dispatch)) { |
437d5aa5 | 707 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 708 | &__event_desc___compat_syscall_exit_unknown; |
a67ba386 | 709 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 710 | struct lttng_event_recorder_enabler *event_enabler; |
2f804c0a 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_COMPAT; | |
1ae083ba | 718 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, syscall_event_enabler->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); | |
5b7ac358 | 727 | } |
0bb716a8 | 728 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->compat_unknown_syscall_exit_dispatch); |
5b7ac358 MD |
729 | } |
730 | ||
0bb716a8 | 731 | if (hlist_empty(&syscall_table->unknown_syscall_exit_dispatch)) { |
437d5aa5 | 732 | const struct lttng_kernel_event_desc *desc = |
5b7ac358 | 733 | &__event_desc___syscall_exit_unknown; |
a67ba386 | 734 | struct lttng_kernel_event_recorder *event_recorder; |
1ae083ba | 735 | struct lttng_event_recorder_enabler *event_enabler; |
5b7ac358 MD |
736 | |
737 | memset(&ev, 0, sizeof(ev)); | |
606828e4 MD |
738 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); |
739 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
740 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
741 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
742 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
1ae083ba | 743 | event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, syscall_event_enabler->chan); |
def1e304 MD |
744 | if (!event_enabler) { |
745 | return -ENOMEM; | |
746 | } | |
747 | event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc); | |
a67ba386 | 748 | WARN_ON_ONCE(!event_recorder); |
44b1abdc | 749 | lttng_event_enabler_destroy(&event_enabler->parent); |
a67ba386 MD |
750 | if (IS_ERR(event_recorder)) { |
751 | return PTR_ERR(event_recorder); | |
2f804c0a | 752 | } |
0bb716a8 | 753 | hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->unknown_syscall_exit_dispatch); |
2f804c0a MD |
754 | } |
755 | ||
ebcc64cd | 756 | ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, |
0bb716a8 | 757 | syscall_table->syscall_dispatch, syscall_event_enabler, SC_TYPE_ENTRY); |
5b7ac358 MD |
758 | if (ret) |
759 | return ret; | |
ebcc64cd | 760 | ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, |
0bb716a8 | 761 | syscall_table->syscall_exit_dispatch, syscall_event_enabler, SC_TYPE_EXIT); |
49c50022 MD |
762 | if (ret) |
763 | return ret; | |
5b7ac358 | 764 | |
49c50022 | 765 | #ifdef CONFIG_COMPAT |
ebcc64cd | 766 | ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, |
0bb716a8 | 767 | syscall_table->compat_syscall_dispatch, syscall_event_enabler, SC_TYPE_COMPAT_ENTRY); |
5b7ac358 MD |
768 | if (ret) |
769 | return ret; | |
ebcc64cd | 770 | ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, |
0bb716a8 | 771 | syscall_table->compat_syscall_exit_dispatch, syscall_event_enabler, SC_TYPE_COMPAT_EXIT); |
49c50022 MD |
772 | if (ret) |
773 | return ret; | |
774 | #endif | |
badfe9f5 | 775 | |
0bb716a8 MD |
776 | if (!syscall_table->sc_filter) { |
777 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
badfe9f5 | 778 | GFP_KERNEL); |
0bb716a8 | 779 | if (!syscall_table->sc_filter) |
badfe9f5 MD |
780 | return -ENOMEM; |
781 | } | |
782 | ||
0bb716a8 | 783 | if (!syscall_table->sys_enter_registered) { |
80f87dd2 | 784 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 785 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
786 | if (ret) |
787 | return ret; | |
0bb716a8 | 788 | syscall_table->sys_enter_registered = 1; |
80f87dd2 | 789 | } |
63728b02 MD |
790 | /* |
791 | * We change the name of sys_exit tracepoint due to namespace | |
792 | * conflict with sys_exit syscall entry. | |
793 | */ | |
0bb716a8 | 794 | if (!syscall_table->sys_exit_registered) { |
80f87dd2 | 795 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 796 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
797 | if (ret) { |
798 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 799 | (void *) syscall_entry_event_probe, syscall_table)); |
80f87dd2 MD |
800 | return ret; |
801 | } | |
0bb716a8 | 802 | syscall_table->sys_exit_registered = 1; |
63728b02 | 803 | } |
259b6cb3 MD |
804 | return ret; |
805 | } | |
806 | ||
807 | /* | |
8a8ac9a8 FD |
808 | * Should be called with sessions lock held. |
809 | */ | |
810 | int lttng_syscalls_register_event_notifier( | |
a67ba386 | 811 | struct lttng_event_notifier_enabler *event_notifier_enabler) |
8a8ac9a8 FD |
812 | { |
813 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
0bb716a8 | 814 | struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table; |
8a8ac9a8 FD |
815 | int ret = 0; |
816 | ||
817 | wrapper_vmalloc_sync_mappings(); | |
818 | ||
0bb716a8 MD |
819 | if (!syscall_table->syscall_dispatch) { |
820 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); | |
821 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 822 | return -ENOMEM; |
8a8ac9a8 FD |
823 | } |
824 | ||
0bb716a8 MD |
825 | if (!syscall_table->syscall_exit_dispatch) { |
826 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); | |
827 | if (!syscall_table->syscall_exit_dispatch) | |
8a8ac9a8 | 828 | return -ENOMEM; |
8a8ac9a8 FD |
829 | } |
830 | ||
831 | #ifdef CONFIG_COMPAT | |
0bb716a8 MD |
832 | if (!syscall_table->compat_syscall_dispatch) { |
833 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); | |
834 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 835 | return -ENOMEM; |
8a8ac9a8 FD |
836 | } |
837 | ||
0bb716a8 MD |
838 | if (!syscall_table->compat_syscall_exit_dispatch) { |
839 | syscall_table->compat_syscall_exit_dispatch = | |
ebcc64cd | 840 | kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, |
8a8ac9a8 | 841 | GFP_KERNEL); |
0bb716a8 | 842 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 843 | return -ENOMEM; |
8a8ac9a8 FD |
844 | } |
845 | #endif | |
846 | ||
0bb716a8 MD |
847 | if (!syscall_table->sc_filter) { |
848 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 849 | GFP_KERNEL); |
0bb716a8 | 850 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
851 | return -ENOMEM; |
852 | } | |
853 | ||
0bb716a8 | 854 | if (!syscall_table->sys_enter_registered) { |
8a8ac9a8 | 855 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 856 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
857 | if (ret) |
858 | return ret; | |
0bb716a8 | 859 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 FD |
860 | } |
861 | ||
0bb716a8 | 862 | if (!syscall_table->sys_exit_registered) { |
8a8ac9a8 | 863 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 864 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 FD |
865 | if (ret) { |
866 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 867 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
868 | return ret; |
869 | } | |
0bb716a8 | 870 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 FD |
871 | } |
872 | ||
873 | return ret; | |
874 | } | |
875 | ||
876 | static | |
877 | int create_unknown_event_notifier( | |
878 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
879 | enum sc_type type) | |
880 | { | |
a67ba386 MD |
881 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
882 | struct lttng_kernel_event_notifier *event_notifier; | |
437d5aa5 | 883 | const struct lttng_kernel_event_desc *desc; |
8a8ac9a8 | 884 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; |
0bb716a8 | 885 | struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table; |
606828e4 | 886 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
5b9817ae | 887 | uint64_t user_token = event_notifier_enabler->parent.user_token; |
99f52fcc | 888 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8d554755 | 889 | struct lttng_event_enabler_common *base_enabler = lttng_event_notifier_enabler_as_enabler( |
8a8ac9a8 FD |
890 | event_notifier_enabler); |
891 | struct hlist_head *unknown_dispatch_list; | |
892 | int ret = 0; | |
893 | bool found = false; | |
606828e4 MD |
894 | enum lttng_kernel_abi_syscall_abi abi; |
895 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
8a8ac9a8 FD |
896 | struct hlist_head *head; |
897 | ||
898 | switch (type) { | |
899 | case SC_TYPE_ENTRY: | |
900 | desc = &__event_desc___syscall_entry_unknown; | |
0bb716a8 | 901 | unknown_dispatch_list = &syscall_table->unknown_syscall_dispatch; |
606828e4 MD |
902 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
903 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
904 | break; |
905 | case SC_TYPE_EXIT: | |
906 | desc = &__event_desc___syscall_exit_unknown; | |
0bb716a8 | 907 | unknown_dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; |
606828e4 MD |
908 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
909 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
910 | break; |
911 | case SC_TYPE_COMPAT_ENTRY: | |
912 | desc = &__event_desc___compat_syscall_entry_unknown; | |
0bb716a8 | 913 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; |
606828e4 MD |
914 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
915 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
916 | break; |
917 | case SC_TYPE_COMPAT_EXIT: | |
918 | desc = &__event_desc___compat_syscall_exit_unknown; | |
0bb716a8 | 919 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
606828e4 MD |
920 | entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
921 | abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
922 | break; |
923 | default: | |
924 | BUG_ON(1); | |
925 | } | |
926 | ||
927 | /* | |
928 | * Check if already created. | |
929 | */ | |
930 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 931 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
932 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
933 | if (event_notifier_priv->parent.desc == desc && | |
934 | event_notifier_priv->parent.user_token == base_enabler->user_token) | |
8a8ac9a8 FD |
935 | found = true; |
936 | } | |
937 | if (found) | |
938 | goto end; | |
939 | ||
940 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
437d5aa5 | 941 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 | 942 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
8a8ac9a8 | 943 | |
606828e4 | 944 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; |
8a8ac9a8 | 945 | |
606828e4 | 946 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; |
8a8ac9a8 FD |
947 | event_notifier_param.event.u.syscall.abi = abi; |
948 | event_notifier_param.event.u.syscall.entryexit = entryexit; | |
949 | ||
a67ba386 MD |
950 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
951 | error_counter_index, group, &event_notifier_param, | |
8a8ac9a8 | 952 | event_notifier_param.event.instrumentation); |
a67ba386 | 953 | if (IS_ERR(event_notifier)) { |
8a8ac9a8 | 954 | printk(KERN_INFO "Unable to create unknown notifier %s\n", |
437d5aa5 | 955 | desc->event_name); |
8a8ac9a8 FD |
956 | ret = -ENOMEM; |
957 | goto end; | |
958 | } | |
959 | ||
a67ba386 | 960 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list); |
8a8ac9a8 FD |
961 | |
962 | end: | |
963 | return ret; | |
964 | } | |
965 | ||
966 | static int create_matching_event_notifiers( | |
967 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
a67ba386 | 968 | const struct trace_syscall_entry *table, |
8a8ac9a8 FD |
969 | size_t table_len, enum sc_type type) |
970 | { | |
971 | struct lttng_event_notifier_group *group = event_notifier_enabler->group; | |
437d5aa5 | 972 | const struct lttng_kernel_event_desc *desc; |
5b9817ae | 973 | uint64_t user_token = event_notifier_enabler->parent.user_token; |
99f52fcc | 974 | uint64_t error_counter_index = event_notifier_enabler->error_counter_index; |
8a8ac9a8 FD |
975 | unsigned int i; |
976 | int ret = 0; | |
977 | ||
978 | /* iterate over all syscall and create event_notifier that match */ | |
979 | for (i = 0; i < table_len; i++) { | |
a67ba386 MD |
980 | struct lttng_kernel_event_notifier_private *event_notifier_priv; |
981 | struct lttng_kernel_event_notifier *event_notifier; | |
606828e4 | 982 | struct lttng_kernel_abi_event_notifier event_notifier_param; |
8a8ac9a8 FD |
983 | struct hlist_head *head; |
984 | int found = 0; | |
985 | ||
986 | desc = table[i].desc; | |
987 | if (!desc) { | |
988 | /* Unknown syscall */ | |
989 | continue; | |
990 | } | |
991 | ||
992 | if (!lttng_desc_match_enabler(desc, | |
993 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
994 | continue; | |
995 | ||
996 | /* | |
997 | * Check if already created. | |
998 | */ | |
999 | head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table, | |
437d5aa5 | 1000 | LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name); |
a67ba386 MD |
1001 | lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) { |
1002 | if (event_notifier_priv->parent.desc == desc | |
5b9817ae | 1003 | && event_notifier_priv->parent.user_token == event_notifier_enabler->parent.user_token) |
8a8ac9a8 FD |
1004 | found = 1; |
1005 | } | |
1006 | if (found) | |
1007 | continue; | |
1008 | ||
1009 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
1010 | switch (type) { | |
1011 | case SC_TYPE_ENTRY: | |
606828e4 MD |
1012 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1013 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1014 | break; |
1015 | case SC_TYPE_EXIT: | |
606828e4 MD |
1016 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1017 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
8a8ac9a8 FD |
1018 | break; |
1019 | case SC_TYPE_COMPAT_ENTRY: | |
606828e4 MD |
1020 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; |
1021 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1022 | break; |
1023 | case SC_TYPE_COMPAT_EXIT: | |
606828e4 MD |
1024 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; |
1025 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
8a8ac9a8 FD |
1026 | break; |
1027 | } | |
437d5aa5 | 1028 | strncat(event_notifier_param.event.name, desc->event_name, |
606828e4 MD |
1029 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); |
1030 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
1031 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
8a8ac9a8 | 1032 | |
99f52fcc FD |
1033 | event_notifier = _lttng_event_notifier_create(desc, user_token, |
1034 | error_counter_index, group, &event_notifier_param, | |
a67ba386 | 1035 | event_notifier_param.event.instrumentation); |
8a8ac9a8 FD |
1036 | if (IS_ERR(event_notifier)) { |
1037 | printk(KERN_INFO "Unable to create event_notifier %s\n", | |
437d5aa5 | 1038 | desc->event_name); |
8a8ac9a8 FD |
1039 | ret = -ENOMEM; |
1040 | goto end; | |
1041 | } | |
1042 | ||
a67ba386 | 1043 | event_notifier->priv->parent.u.syscall.syscall_id = i; |
8a8ac9a8 FD |
1044 | } |
1045 | ||
1046 | end: | |
1047 | return ret; | |
1048 | ||
1049 | } | |
1050 | ||
a67ba386 MD |
1051 | int lttng_syscalls_create_matching_event_notifiers( |
1052 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
8a8ac9a8 FD |
1053 | { |
1054 | int ret; | |
8d554755 | 1055 | struct lttng_event_enabler_common *base_enabler = |
8a8ac9a8 | 1056 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler); |
606828e4 | 1057 | enum lttng_kernel_abi_syscall_entryexit entryexit = |
8a8ac9a8 FD |
1058 | base_enabler->event_param.u.syscall.entryexit; |
1059 | ||
606828e4 | 1060 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1061 | ret = create_matching_event_notifiers(event_notifier_enabler, |
ebcc64cd | 1062 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); |
8a8ac9a8 FD |
1063 | if (ret) |
1064 | goto end; | |
1065 | ||
1066 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
ebcc64cd | 1067 | compat_sc_table.table, compat_sc_table.len, |
8a8ac9a8 FD |
1068 | SC_TYPE_COMPAT_ENTRY); |
1069 | if (ret) | |
1070 | goto end; | |
1071 | ||
1072 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1073 | SC_TYPE_ENTRY); | |
1074 | if (ret) | |
1075 | goto end; | |
1076 | ||
1077 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1078 | SC_TYPE_COMPAT_ENTRY); | |
1079 | if (ret) | |
1080 | goto end; | |
1081 | } | |
1082 | ||
606828e4 | 1083 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
8a8ac9a8 | 1084 | ret = create_matching_event_notifiers(event_notifier_enabler, |
ebcc64cd | 1085 | sc_exit_table.table, sc_exit_table.len, |
8a8ac9a8 FD |
1086 | SC_TYPE_EXIT); |
1087 | if (ret) | |
1088 | goto end; | |
1089 | ||
1090 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1091 | SC_TYPE_EXIT); | |
1092 | if (ret) | |
1093 | goto end; | |
1094 | ||
1095 | ret = create_matching_event_notifiers(event_notifier_enabler, | |
ebcc64cd | 1096 | compat_sc_exit_table.table, compat_sc_exit_table.len, |
8a8ac9a8 FD |
1097 | SC_TYPE_COMPAT_EXIT); |
1098 | if (ret) | |
1099 | goto end; | |
1100 | ||
1101 | ret = create_unknown_event_notifier(event_notifier_enabler, | |
1102 | SC_TYPE_COMPAT_EXIT); | |
1103 | if (ret) | |
1104 | goto end; | |
1105 | } | |
1106 | ||
1107 | end: | |
1108 | return ret; | |
1109 | } | |
1110 | ||
6053e75e | 1111 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
1112 | { |
1113 | int ret; | |
1114 | ||
0bb716a8 | 1115 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 1116 | return 0; |
0bb716a8 | 1117 | if (syscall_table->sys_enter_registered) { |
2d9cd7f3 | 1118 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 1119 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
1120 | if (ret) |
1121 | return ret; | |
0bb716a8 | 1122 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 1123 | } |
0bb716a8 | 1124 | if (syscall_table->sys_exit_registered) { |
2d9cd7f3 | 1125 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 1126 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
1127 | if (ret) |
1128 | return ret; | |
0bb716a8 | 1129 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 1130 | } |
badfe9f5 MD |
1131 | return 0; |
1132 | } | |
1133 | ||
6053e75e | 1134 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 1135 | { |
0bb716a8 MD |
1136 | kfree(syscall_table->syscall_dispatch); |
1137 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 1138 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
1139 | kfree(syscall_table->compat_syscall_dispatch); |
1140 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 1141 | #endif |
0bb716a8 | 1142 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
1143 | return 0; |
1144 | } | |
1145 | ||
1146 | static | |
1147 | int get_syscall_nr(const char *syscall_name) | |
1148 | { | |
1149 | int syscall_nr = -1; | |
1150 | int i; | |
1151 | ||
ebcc64cd | 1152 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 1153 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1154 | const char *it_name; |
80f87dd2 | 1155 | |
ebcc64cd | 1156 | entry = &sc_table.table[i]; |
80f87dd2 MD |
1157 | if (!entry->desc) |
1158 | continue; | |
437d5aa5 | 1159 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1160 | it_name += strlen(SYSCALL_ENTRY_STR); |
1161 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1162 | syscall_nr = i; |
1163 | break; | |
1164 | } | |
1165 | } | |
1166 | return syscall_nr; | |
1167 | } | |
1168 | ||
1169 | static | |
1170 | int get_compat_syscall_nr(const char *syscall_name) | |
1171 | { | |
1172 | int syscall_nr = -1; | |
1173 | int i; | |
1174 | ||
ebcc64cd | 1175 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 1176 | const struct trace_syscall_entry *entry; |
5b7ac358 | 1177 | const char *it_name; |
80f87dd2 | 1178 | |
ebcc64cd | 1179 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
1180 | if (!entry->desc) |
1181 | continue; | |
437d5aa5 | 1182 | it_name = entry->desc->event_name; |
5b7ac358 MD |
1183 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
1184 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
1185 | syscall_nr = i; |
1186 | break; | |
1187 | } | |
1188 | } | |
1189 | return syscall_nr; | |
1190 | } | |
1191 | ||
12e579db MD |
1192 | static |
1193 | uint32_t get_sc_tables_len(void) | |
1194 | { | |
ebcc64cd | 1195 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
1196 | } |
1197 | ||
badfe9f5 | 1198 | static |
ade8a729 FD |
1199 | const char *get_syscall_name(const char *desc_name, |
1200 | enum lttng_syscall_abi abi, | |
1201 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 1202 | { |
badfe9f5 | 1203 | size_t prefix_len = 0; |
80f87dd2 | 1204 | |
80f87dd2 | 1205 | |
ade8a729 | 1206 | switch (entryexit) { |
badfe9f5 | 1207 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1208 | switch (abi) { |
badfe9f5 MD |
1209 | case LTTNG_SYSCALL_ABI_NATIVE: |
1210 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
1211 | break; | |
1212 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1213 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
1214 | break; | |
80f87dd2 | 1215 | } |
badfe9f5 MD |
1216 | break; |
1217 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1218 | switch (abi) { |
badfe9f5 MD |
1219 | case LTTNG_SYSCALL_ABI_NATIVE: |
1220 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
1221 | break; | |
1222 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1223 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
1224 | break; | |
80f87dd2 | 1225 | } |
badfe9f5 | 1226 | break; |
80f87dd2 | 1227 | } |
badfe9f5 | 1228 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 1229 | return desc_name + prefix_len; |
badfe9f5 MD |
1230 | } |
1231 | ||
ade8a729 FD |
1232 | static |
1233 | int lttng_syscall_filter_enable( | |
1234 | struct lttng_syscall_filter *filter, | |
1235 | const char *desc_name, enum lttng_syscall_abi abi, | |
1236 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 1237 | { |
badfe9f5 MD |
1238 | const char *syscall_name; |
1239 | unsigned long *bitmap; | |
1240 | int syscall_nr; | |
1241 | ||
ade8a729 | 1242 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 1243 | |
ade8a729 | 1244 | switch (abi) { |
badfe9f5 MD |
1245 | case LTTNG_SYSCALL_ABI_NATIVE: |
1246 | syscall_nr = get_syscall_nr(syscall_name); | |
1247 | break; | |
1248 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1249 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1250 | break; | |
1251 | default: | |
1252 | return -EINVAL; | |
80f87dd2 | 1253 | } |
badfe9f5 MD |
1254 | if (syscall_nr < 0) |
1255 | return -ENOENT; | |
1256 | ||
ade8a729 | 1257 | switch (entryexit) { |
badfe9f5 | 1258 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1259 | switch (abi) { |
badfe9f5 MD |
1260 | case LTTNG_SYSCALL_ABI_NATIVE: |
1261 | bitmap = filter->sc_entry; | |
1262 | break; | |
1263 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1264 | bitmap = filter->sc_compat_entry; | |
1265 | break; | |
6d9694d8 MD |
1266 | default: |
1267 | return -EINVAL; | |
80f87dd2 | 1268 | } |
badfe9f5 MD |
1269 | break; |
1270 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1271 | switch (abi) { |
badfe9f5 MD |
1272 | case LTTNG_SYSCALL_ABI_NATIVE: |
1273 | bitmap = filter->sc_exit; | |
1274 | break; | |
1275 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1276 | bitmap = filter->sc_compat_exit; | |
1277 | break; | |
6d9694d8 MD |
1278 | default: |
1279 | return -EINVAL; | |
80f87dd2 | 1280 | } |
badfe9f5 MD |
1281 | break; |
1282 | default: | |
1283 | return -EINVAL; | |
80f87dd2 | 1284 | } |
badfe9f5 MD |
1285 | if (test_bit(syscall_nr, bitmap)) |
1286 | return -EEXIST; | |
1287 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1288 | return 0; |
80f87dd2 MD |
1289 | } |
1290 | ||
f2db8be3 | 1291 | int lttng_syscall_filter_enable_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1292 | { |
a67ba386 | 1293 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
0bb716a8 | 1294 | struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table; |
a67ba386 | 1295 | unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id; |
8a8ac9a8 FD |
1296 | struct hlist_head *dispatch_list; |
1297 | int ret = 0; | |
1298 | ||
a67ba386 | 1299 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1300 | |
0bb716a8 | 1301 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, |
a67ba386 MD |
1302 | event_notifier->priv->parent.desc->event_name, |
1303 | event_notifier->priv->parent.u.syscall.abi, | |
1304 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1305 | if (ret) { |
1306 | goto end; | |
1307 | } | |
1308 | ||
a67ba386 | 1309 | switch (event_notifier->priv->parent.u.syscall.entryexit) { |
8a8ac9a8 | 1310 | case LTTNG_SYSCALL_ENTRY: |
a67ba386 | 1311 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 | 1312 | case LTTNG_SYSCALL_ABI_NATIVE: |
0bb716a8 | 1313 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; |
8a8ac9a8 FD |
1314 | break; |
1315 | case LTTNG_SYSCALL_ABI_COMPAT: | |
0bb716a8 | 1316 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; |
8a8ac9a8 | 1317 | break; |
6866b1c7 MJ |
1318 | default: |
1319 | ret = -EINVAL; | |
1320 | goto end; | |
8a8ac9a8 FD |
1321 | } |
1322 | break; | |
1323 | case LTTNG_SYSCALL_EXIT: | |
a67ba386 | 1324 | switch (event_notifier->priv->parent.u.syscall.abi) { |
8a8ac9a8 | 1325 | case LTTNG_SYSCALL_ABI_NATIVE: |
0bb716a8 | 1326 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; |
8a8ac9a8 FD |
1327 | break; |
1328 | case LTTNG_SYSCALL_ABI_COMPAT: | |
0bb716a8 | 1329 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; |
8a8ac9a8 | 1330 | break; |
6866b1c7 MJ |
1331 | default: |
1332 | ret = -EINVAL; | |
1333 | goto end; | |
8a8ac9a8 FD |
1334 | } |
1335 | break; | |
6866b1c7 MJ |
1336 | default: |
1337 | ret = -EINVAL; | |
1338 | goto end; | |
8a8ac9a8 FD |
1339 | } |
1340 | ||
a67ba386 | 1341 | hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list); |
8a8ac9a8 FD |
1342 | |
1343 | end: | |
1344 | return ret ; | |
1345 | } | |
1346 | ||
f2db8be3 | 1347 | int lttng_syscall_filter_enable_event_recorder(struct lttng_kernel_event_recorder *event_recorder) |
80f87dd2 | 1348 | { |
f2db8be3 | 1349 | struct lttng_kernel_channel_buffer *channel = event_recorder->chan; |
0bb716a8 MD |
1350 | struct lttng_kernel_syscall_table *syscall_table = &channel->priv->parent.syscall_table; |
1351 | ||
a67ba386 | 1352 | WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
ade8a729 | 1353 | |
0bb716a8 | 1354 | return lttng_syscall_filter_enable(syscall_table->sc_filter, |
a67ba386 MD |
1355 | event_recorder->priv->parent.desc->event_name, |
1356 | event_recorder->priv->parent.u.syscall.abi, | |
1357 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1358 | } |
1359 | ||
1360 | static | |
f2db8be3 | 1361 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 FD |
1362 | const char *desc_name, enum lttng_syscall_abi abi, |
1363 | enum lttng_syscall_entryexit entryexit) | |
1364 | { | |
badfe9f5 MD |
1365 | const char *syscall_name; |
1366 | unsigned long *bitmap; | |
1367 | int syscall_nr; | |
80f87dd2 | 1368 | |
ade8a729 | 1369 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1370 | |
ade8a729 | 1371 | switch (abi) { |
badfe9f5 MD |
1372 | case LTTNG_SYSCALL_ABI_NATIVE: |
1373 | syscall_nr = get_syscall_nr(syscall_name); | |
1374 | break; | |
1375 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1376 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1377 | break; | |
1378 | default: | |
1379 | return -EINVAL; | |
80f87dd2 | 1380 | } |
badfe9f5 MD |
1381 | if (syscall_nr < 0) |
1382 | return -ENOENT; | |
80f87dd2 | 1383 | |
ade8a729 | 1384 | switch (entryexit) { |
badfe9f5 | 1385 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1386 | switch (abi) { |
badfe9f5 MD |
1387 | case LTTNG_SYSCALL_ABI_NATIVE: |
1388 | bitmap = filter->sc_entry; | |
1389 | break; | |
1390 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1391 | bitmap = filter->sc_compat_entry; | |
1392 | break; | |
6d9694d8 MD |
1393 | default: |
1394 | return -EINVAL; | |
80f87dd2 | 1395 | } |
badfe9f5 MD |
1396 | break; |
1397 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1398 | switch (abi) { |
badfe9f5 MD |
1399 | case LTTNG_SYSCALL_ABI_NATIVE: |
1400 | bitmap = filter->sc_exit; | |
1401 | break; | |
1402 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1403 | bitmap = filter->sc_compat_exit; | |
1404 | break; | |
6d9694d8 MD |
1405 | default: |
1406 | return -EINVAL; | |
80f87dd2 | 1407 | } |
badfe9f5 MD |
1408 | break; |
1409 | default: | |
1410 | return -EINVAL; | |
80f87dd2 | 1411 | } |
badfe9f5 MD |
1412 | if (!test_bit(syscall_nr, bitmap)) |
1413 | return -EEXIST; | |
1414 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1415 | |
badfe9f5 | 1416 | return 0; |
259b6cb3 | 1417 | } |
2d2464bd | 1418 | |
f2db8be3 | 1419 | int lttng_syscall_filter_disable_event_notifier(struct lttng_kernel_event_notifier *event_notifier) |
8a8ac9a8 | 1420 | { |
a67ba386 | 1421 | struct lttng_event_notifier_group *group = event_notifier->priv->group; |
0bb716a8 | 1422 | struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table; |
8a8ac9a8 FD |
1423 | int ret; |
1424 | ||
a67ba386 | 1425 | WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1426 | |
0bb716a8 | 1427 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, |
a67ba386 MD |
1428 | event_notifier->priv->parent.desc->event_name, |
1429 | event_notifier->priv->parent.u.syscall.abi, | |
1430 | event_notifier->priv->parent.u.syscall.entryexit); | |
8a8ac9a8 FD |
1431 | WARN_ON_ONCE(ret != 0); |
1432 | ||
a67ba386 | 1433 | hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node); |
8a8ac9a8 FD |
1434 | return 0; |
1435 | } | |
1436 | ||
f2db8be3 | 1437 | int lttng_syscall_filter_disable_event_recorder(struct lttng_kernel_event_recorder *event_recorder) |
ade8a729 | 1438 | { |
f2db8be3 | 1439 | struct lttng_kernel_channel_buffer *channel = event_recorder->chan; |
0bb716a8 MD |
1440 | struct lttng_kernel_syscall_table *syscall_table = &channel->priv->parent.syscall_table; |
1441 | ||
1442 | return lttng_syscall_filter_disable(syscall_table->sc_filter, | |
a67ba386 MD |
1443 | event_recorder->priv->parent.desc->event_name, |
1444 | event_recorder->priv->parent.u.syscall.abi, | |
1445 | event_recorder->priv->parent.u.syscall.entryexit); | |
ade8a729 FD |
1446 | } |
1447 | ||
2d2464bd MD |
1448 | static |
1449 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1450 | { | |
1451 | const struct trace_syscall_entry *entry; | |
1452 | int iter = 0; | |
1453 | ||
ebcc64cd FD |
1454 | for (entry = sc_table.table; |
1455 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1456 | entry++) { |
1457 | if (iter++ >= *pos) | |
1458 | return entry; | |
1459 | } | |
ebcc64cd FD |
1460 | for (entry = compat_sc_table.table; |
1461 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1462 | entry++) { |
1463 | if (iter++ >= *pos) | |
1464 | return entry; | |
1465 | } | |
1466 | /* End of list */ | |
1467 | return NULL; | |
1468 | } | |
1469 | ||
1470 | static | |
1471 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1472 | { | |
1473 | return (void *) syscall_list_get_entry(pos); | |
1474 | } | |
1475 | ||
1476 | static | |
1477 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1478 | { | |
1479 | (*ppos)++; | |
1480 | return (void *) syscall_list_get_entry(ppos); | |
1481 | } | |
1482 | ||
1483 | static | |
1484 | void syscall_list_stop(struct seq_file *m, void *p) | |
1485 | { | |
1486 | } | |
1487 | ||
12e579db MD |
1488 | static |
1489 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1490 | const struct trace_syscall_entry **table, | |
1491 | unsigned int *bitness) | |
1492 | { | |
ebcc64cd | 1493 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1494 | if (bitness) |
1495 | *bitness = BITS_PER_LONG; | |
1496 | if (table) | |
ebcc64cd | 1497 | *table = sc_table.table; |
12e579db MD |
1498 | return 0; |
1499 | } | |
ebcc64cd FD |
1500 | if (!(entry >= compat_sc_table.table |
1501 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1502 | return -EINVAL; |
1503 | } | |
1504 | if (bitness) | |
1505 | *bitness = 32; | |
1506 | if (table) | |
ebcc64cd | 1507 | *table = compat_sc_table.table; |
12e579db MD |
1508 | return 0; |
1509 | } | |
1510 | ||
2d2464bd MD |
1511 | static |
1512 | int syscall_list_show(struct seq_file *m, void *p) | |
1513 | { | |
1514 | const struct trace_syscall_entry *table, *entry = p; | |
1515 | unsigned int bitness; | |
d4291869 | 1516 | unsigned long index; |
12e579db | 1517 | int ret; |
d4291869 | 1518 | const char *name; |
2d2464bd | 1519 | |
12e579db MD |
1520 | ret = get_sc_table(entry, &table, &bitness); |
1521 | if (ret) | |
1522 | return ret; | |
f4855b46 MD |
1523 | if (!entry->desc) |
1524 | return 0; | |
ebcc64cd | 1525 | if (table == sc_table.table) { |
d4291869 | 1526 | index = entry - table; |
437d5aa5 | 1527 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1528 | } else { |
ebcc64cd | 1529 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1530 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1531 | } |
12e579db | 1532 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1533 | index, name, bitness); |
2d2464bd MD |
1534 | return 0; |
1535 | } | |
1536 | ||
1537 | static | |
1538 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1539 | .start = syscall_list_start, | |
1540 | .next = syscall_list_next, | |
1541 | .stop = syscall_list_stop, | |
1542 | .show = syscall_list_show, | |
1543 | }; | |
1544 | ||
1545 | static | |
1546 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1547 | { | |
1548 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1549 | } | |
1550 | ||
1551 | const struct file_operations lttng_syscall_list_fops = { | |
1552 | .owner = THIS_MODULE, | |
1553 | .open = lttng_syscall_list_open, | |
1554 | .read = seq_read, | |
1555 | .llseek = seq_lseek, | |
1556 | .release = seq_release, | |
1557 | }; | |
12e579db | 1558 | |
badfe9f5 MD |
1559 | /* |
1560 | * A syscall is enabled if it is traced for either entry or exit. | |
1561 | */ | |
f7d06400 | 1562 | long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer *channel, |
606828e4 | 1563 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db | 1564 | { |
0bb716a8 | 1565 | struct lttng_kernel_syscall_table *syscall_table = &channel->priv->parent.syscall_table; |
12e579db MD |
1566 | uint32_t len, sc_tables_len, bitmask_len; |
1567 | int ret = 0, bit; | |
1568 | char *tmp_mask; | |
1569 | struct lttng_syscall_filter *filter; | |
1570 | ||
1571 | ret = get_user(len, &usyscall_mask->len); | |
1572 | if (ret) | |
1573 | return ret; | |
1574 | sc_tables_len = get_sc_tables_len(); | |
1575 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1576 | if (len < sc_tables_len) { | |
1577 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1578 | } | |
1579 | /* Array is large enough, we can copy array to user-space. */ | |
1580 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1581 | if (!tmp_mask) | |
1582 | return -ENOMEM; | |
0bb716a8 | 1583 | filter = syscall_table->sc_filter; |
12e579db | 1584 | |
ebcc64cd | 1585 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1586 | char state; |
2f25059d | 1587 | |
0bb716a8 MD |
1588 | if (syscall_table->syscall_dispatch) { |
1589 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1590 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1591 | state = test_bit(bit, filter->sc_entry) |
1592 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1593 | else |
1594 | state = 1; | |
1595 | } else { | |
1596 | state = 0; | |
1597 | } | |
1598 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1599 | } |
1600 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1601 | char state; |
2f25059d | 1602 | |
0bb716a8 MD |
1603 | if (syscall_table->compat_syscall_dispatch) { |
1604 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1605 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1606 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1607 | filter->sc_compat_entry) |
ebcc64cd | 1608 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1609 | filter->sc_compat_exit); |
2f25059d MD |
1610 | else |
1611 | state = 1; | |
1612 | } else { | |
1613 | state = 0; | |
1614 | } | |
1615 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1616 | } |
1617 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1618 | ret = -EFAULT; | |
1619 | kfree(tmp_mask); | |
1620 | return ret; | |
1621 | } | |
082d4946 MD |
1622 | |
1623 | int lttng_abi_syscall_list(void) | |
1624 | { | |
1625 | struct file *syscall_list_file; | |
1626 | int file_fd, ret; | |
1627 | ||
4ac10b76 | 1628 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1629 | if (file_fd < 0) { |
1630 | ret = file_fd; | |
1631 | goto fd_error; | |
1632 | } | |
1633 | ||
1634 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1635 | <tng_syscall_list_fops, | |
1636 | NULL, O_RDWR); | |
1637 | if (IS_ERR(syscall_list_file)) { | |
1638 | ret = PTR_ERR(syscall_list_file); | |
1639 | goto file_error; | |
1640 | } | |
1641 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1642 | if (ret < 0) | |
1643 | goto open_error; | |
1644 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1645 | return file_fd; |
1646 | ||
1647 | open_error: | |
1648 | fput(syscall_list_file); | |
1649 | file_error: | |
1650 | put_unused_fd(file_fd); | |
1651 | fd_error: | |
1652 | return ret; | |
1653 | } |