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 | |
5408b6d6 MD |
527 | static |
528 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
529 | const struct lttng_kernel_event_desc *desc, struct hlist_head *dispatch_table, | |
530 | enum sc_type type, unsigned int syscall_nr) | |
531 | { | |
532 | struct lttng_kernel_event_common *event; | |
533 | ||
534 | switch (syscall_event_enabler->enabler_type) { | |
535 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
536 | { | |
537 | struct lttng_event_recorder_enabler *syscall_event_recorder_enabler = | |
538 | container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
539 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
540 | struct lttng_kernel_abi_event ev; | |
541 | ||
542 | /* We need to create an event for this syscall/enabler. */ | |
543 | memset(&ev, 0, sizeof(ev)); | |
544 | switch (type) { | |
545 | case SC_TYPE_ENTRY: | |
546 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
547 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
548 | break; | |
549 | case SC_TYPE_EXIT: | |
550 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
551 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
552 | break; | |
553 | case SC_TYPE_COMPAT_ENTRY: | |
554 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
555 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
556 | break; | |
557 | case SC_TYPE_COMPAT_EXIT: | |
558 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
559 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
560 | break; | |
561 | } | |
562 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); | |
563 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
564 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
565 | event_recorder_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, | |
566 | syscall_event_recorder_enabler->chan); | |
567 | WARN_ON_ONCE(!event_recorder_enabler); | |
568 | if (!event_recorder_enabler) | |
569 | return; | |
570 | event = _lttng_kernel_event_create(&event_recorder_enabler->parent, desc); | |
c3fb484e | 571 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 572 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
c3fb484e | 573 | if (IS_ERR(event)) { |
5408b6d6 MD |
574 | printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name); |
575 | return; | |
576 | } | |
9cd106a6 | 577 | event->priv->u.syscall.syscall_id = syscall_nr; |
fd70f5a5 | 578 | if (dispatch_table) |
9cd106a6 | 579 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_table); |
5408b6d6 MD |
580 | break; |
581 | } | |
582 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
583 | { | |
584 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
585 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
586 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
587 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
588 | uint64_t user_token = syscall_event_enabler->user_token; | |
589 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
590 | ||
591 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
592 | switch (type) { | |
593 | case SC_TYPE_ENTRY: | |
594 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
595 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
596 | break; | |
597 | case SC_TYPE_EXIT: | |
598 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
599 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
600 | break; | |
601 | case SC_TYPE_COMPAT_ENTRY: | |
602 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
603 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
604 | break; | |
605 | case SC_TYPE_COMPAT_EXIT: | |
606 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
607 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
608 | break; | |
609 | } | |
610 | strncat(event_notifier_param.event.name, desc->event_name, | |
611 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
612 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
613 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
614 | event_notifier_param.event.token = user_token; | |
615 | event_notifier_param.error_counter_index = error_counter_index; | |
616 | ||
617 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
618 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
619 | WARN_ON_ONCE(!event_notifier_enabler); | |
620 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); | |
c3fb484e | 621 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 622 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 623 | if (IS_ERR(event)) { |
5408b6d6 MD |
624 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
625 | return; | |
626 | } | |
627 | event->priv->u.syscall.syscall_id = syscall_nr; | |
ac07db60 MD |
628 | if (dispatch_table) |
629 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_table); | |
5408b6d6 MD |
630 | break; |
631 | } | |
632 | default: | |
633 | break; | |
634 | } | |
635 | } | |
636 | ||
49c50022 | 637 | static |
67233a18 MD |
638 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
639 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 640 | { |
063f0825 MD |
641 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common); |
642 | const struct lttng_kernel_event_desc *desc; | |
259b6cb3 | 643 | unsigned int i; |
49c50022 | 644 | |
1d303f69 MD |
645 | #ifndef CONFIG_COMPAT |
646 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 647 | return; |
1d303f69 | 648 | #endif |
67233a18 | 649 | /* iterate over all syscall and create event that match */ |
49c50022 | 650 | for (i = 0; i < table_len; i++) { |
19bef247 | 651 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 652 | struct hlist_head *head; |
6768203a | 653 | bool found = false; |
49c50022 | 654 | |
063f0825 | 655 | desc = table[i].desc; |
49c50022 MD |
656 | if (!desc) { |
657 | /* Unknown syscall */ | |
658 | continue; | |
659 | } | |
063f0825 MD |
660 | |
661 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 662 | continue; |
063f0825 | 663 | |
49c50022 | 664 | /* |
3b82c4e1 | 665 | * Check if already created. |
49c50022 | 666 | */ |
0def9170 | 667 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 668 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
6768203a MD |
669 | if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) { |
670 | found = true; | |
671 | break; | |
672 | } | |
3b82c4e1 MD |
673 | } |
674 | if (found) | |
49c50022 | 675 | continue; |
3b82c4e1 | 676 | |
ecdbbfd8 | 677 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, NULL, type, i); |
49c50022 | 678 | } |
49c50022 MD |
679 | } |
680 | ||
552f7c79 MD |
681 | static |
682 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
683 | { | |
684 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
685 | return false; | |
686 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
687 | return false; | |
688 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
689 | return false; | |
690 | if (strcmp(event_enabler->event_param.name, "*")) | |
691 | return false; | |
692 | return true; | |
693 | } | |
694 | ||
9f6f4507 MD |
695 | static |
696 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
697 | { | |
698 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
699 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); | |
700 | struct lttng_kernel_event_common_private *event_priv; | |
701 | const struct lttng_kernel_event_desc *desc; | |
702 | struct hlist_head *unknown_dispatch_list; | |
703 | bool found = false; | |
704 | struct hlist_head *head; | |
705 | ||
1d303f69 MD |
706 | #ifndef CONFIG_COMPAT |
707 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 708 | return; |
1d303f69 | 709 | #endif |
552f7c79 MD |
710 | /* |
711 | * Considering that currently system calls can only be enabled on a per | |
712 | * name basis (or wildcard based on a name), unknown syscall events are | |
713 | * only used when matching *all* system calls, because this is the only | |
714 | * case which can be associated with an unknown system call. | |
715 | * | |
716 | * When enabling system call on a per system call number basis will be | |
717 | * supported, this will need to be revisited. | |
718 | */ | |
719 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
720 | return; | |
721 | ||
9f6f4507 MD |
722 | switch (type) { |
723 | case SC_TYPE_ENTRY: | |
724 | desc = &__event_desc___syscall_entry_unknown; | |
725 | unknown_dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
726 | break; | |
727 | case SC_TYPE_EXIT: | |
728 | desc = &__event_desc___syscall_exit_unknown; | |
729 | unknown_dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
730 | break; | |
731 | case SC_TYPE_COMPAT_ENTRY: | |
732 | desc = &__event_desc___compat_syscall_entry_unknown; | |
733 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
734 | break; | |
735 | case SC_TYPE_COMPAT_EXIT: | |
736 | desc = &__event_desc___compat_syscall_exit_unknown; | |
737 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
738 | break; | |
739 | default: | |
740 | WARN_ON_ONCE(1); | |
741 | } | |
742 | ||
743 | /* | |
744 | * Check if already created. | |
745 | */ | |
746 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); | |
747 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { | |
6768203a | 748 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
9f6f4507 | 749 | found = true; |
6768203a MD |
750 | break; |
751 | } | |
9f6f4507 MD |
752 | } |
753 | if (!found) | |
754 | lttng_syscall_event_enabler_create_event(event_enabler, desc, unknown_dispatch_list, type, -1U); | |
755 | } | |
756 | ||
d26015f6 | 757 | static |
15a00134 | 758 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 759 | { |
15a00134 | 760 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 761 | |
15a00134 MD |
762 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
763 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
764 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
765 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
766 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
767 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
768 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
769 | } | |
1ab4126a | 770 | |
15a00134 MD |
771 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
772 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
773 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
774 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
775 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
776 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
777 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
778 | } | |
259b6cb3 MD |
779 | } |
780 | ||
781 | /* | |
8a8ac9a8 FD |
782 | * Should be called with sessions lock held. |
783 | */ | |
b2f63bde | 784 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 785 | { |
d26015f6 MD |
786 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
787 | int ret; | |
8a8ac9a8 | 788 | |
0bb716a8 | 789 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 790 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
791 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
792 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 793 | return -ENOMEM; |
8a8ac9a8 | 794 | } |
0bb716a8 | 795 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
796 | /* create syscall table mapping syscall to events */ |
797 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 798 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 799 | return -ENOMEM; |
8a8ac9a8 FD |
800 | } |
801 | ||
802 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 803 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 804 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
805 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
806 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 807 | return -ENOMEM; |
8a8ac9a8 FD |
808 | } |
809 | ||
0bb716a8 | 810 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
811 | /* create syscall table mapping compat syscall to events */ |
812 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 813 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 814 | return -ENOMEM; |
8a8ac9a8 FD |
815 | } |
816 | #endif | |
0bb716a8 MD |
817 | if (!syscall_table->sc_filter) { |
818 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 819 | GFP_KERNEL); |
0bb716a8 | 820 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
821 | return -ENOMEM; |
822 | } | |
823 | ||
0bb716a8 | 824 | if (!syscall_table->sys_enter_registered) { |
8a8ac9a8 | 825 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 826 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
827 | if (ret) |
828 | return ret; | |
0bb716a8 | 829 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 830 | } |
0bb716a8 | 831 | if (!syscall_table->sys_exit_registered) { |
8a8ac9a8 | 832 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 833 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 FD |
834 | if (ret) { |
835 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 836 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
837 | return ret; |
838 | } | |
0bb716a8 | 839 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 840 | } |
0fab709d | 841 | |
86e12a51 MD |
842 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
843 | ||
8a8ac9a8 FD |
844 | return ret; |
845 | } | |
846 | ||
6053e75e | 847 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
848 | { |
849 | int ret; | |
850 | ||
0bb716a8 | 851 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 852 | return 0; |
0bb716a8 | 853 | if (syscall_table->sys_enter_registered) { |
2d9cd7f3 | 854 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 855 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
856 | if (ret) |
857 | return ret; | |
0bb716a8 | 858 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 859 | } |
0bb716a8 | 860 | if (syscall_table->sys_exit_registered) { |
2d9cd7f3 | 861 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 862 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
863 | if (ret) |
864 | return ret; | |
0bb716a8 | 865 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 866 | } |
badfe9f5 MD |
867 | return 0; |
868 | } | |
869 | ||
6053e75e | 870 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 871 | { |
0bb716a8 MD |
872 | kfree(syscall_table->syscall_dispatch); |
873 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 874 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
875 | kfree(syscall_table->compat_syscall_dispatch); |
876 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 877 | #endif |
0bb716a8 | 878 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
879 | return 0; |
880 | } | |
881 | ||
882 | static | |
883 | int get_syscall_nr(const char *syscall_name) | |
884 | { | |
885 | int syscall_nr = -1; | |
886 | int i; | |
887 | ||
ebcc64cd | 888 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 889 | const struct trace_syscall_entry *entry; |
5b7ac358 | 890 | const char *it_name; |
80f87dd2 | 891 | |
ebcc64cd | 892 | entry = &sc_table.table[i]; |
80f87dd2 MD |
893 | if (!entry->desc) |
894 | continue; | |
437d5aa5 | 895 | it_name = entry->desc->event_name; |
5b7ac358 MD |
896 | it_name += strlen(SYSCALL_ENTRY_STR); |
897 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
898 | syscall_nr = i; |
899 | break; | |
900 | } | |
901 | } | |
902 | return syscall_nr; | |
903 | } | |
904 | ||
905 | static | |
906 | int get_compat_syscall_nr(const char *syscall_name) | |
907 | { | |
908 | int syscall_nr = -1; | |
909 | int i; | |
910 | ||
ebcc64cd | 911 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 912 | const struct trace_syscall_entry *entry; |
5b7ac358 | 913 | const char *it_name; |
80f87dd2 | 914 | |
ebcc64cd | 915 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
916 | if (!entry->desc) |
917 | continue; | |
437d5aa5 | 918 | it_name = entry->desc->event_name; |
5b7ac358 MD |
919 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
920 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
921 | syscall_nr = i; |
922 | break; | |
923 | } | |
924 | } | |
925 | return syscall_nr; | |
926 | } | |
927 | ||
12e579db MD |
928 | static |
929 | uint32_t get_sc_tables_len(void) | |
930 | { | |
ebcc64cd | 931 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
932 | } |
933 | ||
badfe9f5 | 934 | static |
ade8a729 FD |
935 | const char *get_syscall_name(const char *desc_name, |
936 | enum lttng_syscall_abi abi, | |
937 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 938 | { |
badfe9f5 | 939 | size_t prefix_len = 0; |
80f87dd2 | 940 | |
80f87dd2 | 941 | |
ade8a729 | 942 | switch (entryexit) { |
badfe9f5 | 943 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 944 | switch (abi) { |
badfe9f5 MD |
945 | case LTTNG_SYSCALL_ABI_NATIVE: |
946 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
947 | break; | |
948 | case LTTNG_SYSCALL_ABI_COMPAT: | |
949 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
950 | break; | |
80f87dd2 | 951 | } |
badfe9f5 MD |
952 | break; |
953 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 954 | switch (abi) { |
badfe9f5 MD |
955 | case LTTNG_SYSCALL_ABI_NATIVE: |
956 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
957 | break; | |
958 | case LTTNG_SYSCALL_ABI_COMPAT: | |
959 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
960 | break; | |
80f87dd2 | 961 | } |
badfe9f5 | 962 | break; |
80f87dd2 | 963 | } |
badfe9f5 | 964 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 965 | return desc_name + prefix_len; |
badfe9f5 MD |
966 | } |
967 | ||
ade8a729 FD |
968 | static |
969 | int lttng_syscall_filter_enable( | |
970 | struct lttng_syscall_filter *filter, | |
971 | const char *desc_name, enum lttng_syscall_abi abi, | |
972 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 973 | { |
badfe9f5 MD |
974 | const char *syscall_name; |
975 | unsigned long *bitmap; | |
976 | int syscall_nr; | |
977 | ||
ade8a729 | 978 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 979 | |
ade8a729 | 980 | switch (abi) { |
badfe9f5 MD |
981 | case LTTNG_SYSCALL_ABI_NATIVE: |
982 | syscall_nr = get_syscall_nr(syscall_name); | |
983 | break; | |
984 | case LTTNG_SYSCALL_ABI_COMPAT: | |
985 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
986 | break; | |
987 | default: | |
988 | return -EINVAL; | |
80f87dd2 | 989 | } |
badfe9f5 MD |
990 | if (syscall_nr < 0) |
991 | return -ENOENT; | |
992 | ||
ade8a729 | 993 | switch (entryexit) { |
badfe9f5 | 994 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 995 | switch (abi) { |
badfe9f5 MD |
996 | case LTTNG_SYSCALL_ABI_NATIVE: |
997 | bitmap = filter->sc_entry; | |
998 | break; | |
999 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1000 | bitmap = filter->sc_compat_entry; | |
1001 | break; | |
6d9694d8 MD |
1002 | default: |
1003 | return -EINVAL; | |
80f87dd2 | 1004 | } |
badfe9f5 MD |
1005 | break; |
1006 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1007 | switch (abi) { |
badfe9f5 MD |
1008 | case LTTNG_SYSCALL_ABI_NATIVE: |
1009 | bitmap = filter->sc_exit; | |
1010 | break; | |
1011 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1012 | bitmap = filter->sc_compat_exit; | |
1013 | break; | |
6d9694d8 MD |
1014 | default: |
1015 | return -EINVAL; | |
80f87dd2 | 1016 | } |
badfe9f5 MD |
1017 | break; |
1018 | default: | |
1019 | return -EINVAL; | |
80f87dd2 | 1020 | } |
badfe9f5 MD |
1021 | if (test_bit(syscall_nr, bitmap)) |
1022 | return -EEXIST; | |
1023 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1024 | return 0; |
80f87dd2 MD |
1025 | } |
1026 | ||
9b2f1c54 | 1027 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1028 | { |
9b2f1c54 | 1029 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
1030 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
1031 | struct hlist_head *dispatch_list; | |
9b2f1c54 | 1032 | int ret; |
8a8ac9a8 | 1033 | |
9b2f1c54 | 1034 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1035 | |
0bb716a8 | 1036 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, |
9b2f1c54 MD |
1037 | event->priv->desc->event_name, event->priv->u.syscall.abi, |
1038 | event->priv->u.syscall.entryexit); | |
1039 | if (ret) | |
1040 | return ret; | |
8a8ac9a8 | 1041 | |
9cd106a6 MD |
1042 | switch (event->priv->u.syscall.entryexit) { |
1043 | case LTTNG_SYSCALL_ENTRY: | |
1044 | switch (event->priv->u.syscall.abi) { | |
1045 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1046 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1047 | break; | |
1048 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1049 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1050 | break; | |
1051 | default: | |
1052 | ret = -EINVAL; | |
1053 | goto end; | |
1054 | } | |
8a8ac9a8 | 1055 | break; |
9cd106a6 MD |
1056 | case LTTNG_SYSCALL_EXIT: |
1057 | switch (event->priv->u.syscall.abi) { | |
1058 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1059 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
8a8ac9a8 | 1060 | break; |
9cd106a6 MD |
1061 | case LTTNG_SYSCALL_ABI_COMPAT: |
1062 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
8a8ac9a8 | 1063 | break; |
6866b1c7 MJ |
1064 | default: |
1065 | ret = -EINVAL; | |
1066 | goto end; | |
8a8ac9a8 FD |
1067 | } |
1068 | break; | |
6866b1c7 | 1069 | default: |
9cd106a6 MD |
1070 | ret = -EINVAL; |
1071 | goto end; | |
8a8ac9a8 | 1072 | } |
9cd106a6 MD |
1073 | |
1074 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1075 | end: |
9b2f1c54 | 1076 | return ret; |
ade8a729 FD |
1077 | } |
1078 | ||
1079 | static | |
f2db8be3 | 1080 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 FD |
1081 | const char *desc_name, enum lttng_syscall_abi abi, |
1082 | enum lttng_syscall_entryexit entryexit) | |
1083 | { | |
badfe9f5 MD |
1084 | const char *syscall_name; |
1085 | unsigned long *bitmap; | |
1086 | int syscall_nr; | |
80f87dd2 | 1087 | |
ade8a729 | 1088 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1089 | |
ade8a729 | 1090 | switch (abi) { |
badfe9f5 MD |
1091 | case LTTNG_SYSCALL_ABI_NATIVE: |
1092 | syscall_nr = get_syscall_nr(syscall_name); | |
1093 | break; | |
1094 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1095 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1096 | break; | |
1097 | default: | |
1098 | return -EINVAL; | |
80f87dd2 | 1099 | } |
badfe9f5 MD |
1100 | if (syscall_nr < 0) |
1101 | return -ENOENT; | |
80f87dd2 | 1102 | |
ade8a729 | 1103 | switch (entryexit) { |
badfe9f5 | 1104 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1105 | switch (abi) { |
badfe9f5 MD |
1106 | case LTTNG_SYSCALL_ABI_NATIVE: |
1107 | bitmap = filter->sc_entry; | |
1108 | break; | |
1109 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1110 | bitmap = filter->sc_compat_entry; | |
1111 | break; | |
6d9694d8 MD |
1112 | default: |
1113 | return -EINVAL; | |
80f87dd2 | 1114 | } |
badfe9f5 MD |
1115 | break; |
1116 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1117 | switch (abi) { |
badfe9f5 MD |
1118 | case LTTNG_SYSCALL_ABI_NATIVE: |
1119 | bitmap = filter->sc_exit; | |
1120 | break; | |
1121 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1122 | bitmap = filter->sc_compat_exit; | |
1123 | break; | |
6d9694d8 MD |
1124 | default: |
1125 | return -EINVAL; | |
80f87dd2 | 1126 | } |
badfe9f5 MD |
1127 | break; |
1128 | default: | |
1129 | return -EINVAL; | |
80f87dd2 | 1130 | } |
badfe9f5 MD |
1131 | if (!test_bit(syscall_nr, bitmap)) |
1132 | return -EEXIST; | |
1133 | bitmap_clear(bitmap, syscall_nr, 1); | |
80f87dd2 | 1134 | |
badfe9f5 | 1135 | return 0; |
259b6cb3 | 1136 | } |
2d2464bd | 1137 | |
9b2f1c54 | 1138 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1139 | { |
9b2f1c54 | 1140 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
8a8ac9a8 FD |
1141 | int ret; |
1142 | ||
0bb716a8 | 1143 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, |
9b2f1c54 MD |
1144 | event->priv->desc->event_name, event->priv->u.syscall.abi, |
1145 | event->priv->u.syscall.entryexit); | |
1146 | if (ret) | |
1147 | return ret; | |
9cd106a6 | 1148 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1149 | return 0; |
1150 | } | |
1151 | ||
9cb5be7e MD |
1152 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1153 | { | |
1154 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1155 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1156 | int enabled = event_enabler->enabled; | |
1157 | ||
552f7c79 | 1158 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1159 | return; |
9cb5be7e MD |
1160 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1161 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1162 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1163 | ||
1164 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1165 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1166 | } | |
1167 | ||
2d2464bd MD |
1168 | static |
1169 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1170 | { | |
1171 | const struct trace_syscall_entry *entry; | |
1172 | int iter = 0; | |
1173 | ||
ebcc64cd FD |
1174 | for (entry = sc_table.table; |
1175 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1176 | entry++) { |
1177 | if (iter++ >= *pos) | |
1178 | return entry; | |
1179 | } | |
ebcc64cd FD |
1180 | for (entry = compat_sc_table.table; |
1181 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1182 | entry++) { |
1183 | if (iter++ >= *pos) | |
1184 | return entry; | |
1185 | } | |
1186 | /* End of list */ | |
1187 | return NULL; | |
1188 | } | |
1189 | ||
1190 | static | |
1191 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1192 | { | |
1193 | return (void *) syscall_list_get_entry(pos); | |
1194 | } | |
1195 | ||
1196 | static | |
1197 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1198 | { | |
1199 | (*ppos)++; | |
1200 | return (void *) syscall_list_get_entry(ppos); | |
1201 | } | |
1202 | ||
1203 | static | |
1204 | void syscall_list_stop(struct seq_file *m, void *p) | |
1205 | { | |
1206 | } | |
1207 | ||
12e579db MD |
1208 | static |
1209 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1210 | const struct trace_syscall_entry **table, | |
1211 | unsigned int *bitness) | |
1212 | { | |
ebcc64cd | 1213 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1214 | if (bitness) |
1215 | *bitness = BITS_PER_LONG; | |
1216 | if (table) | |
ebcc64cd | 1217 | *table = sc_table.table; |
12e579db MD |
1218 | return 0; |
1219 | } | |
ebcc64cd FD |
1220 | if (!(entry >= compat_sc_table.table |
1221 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1222 | return -EINVAL; |
1223 | } | |
1224 | if (bitness) | |
1225 | *bitness = 32; | |
1226 | if (table) | |
ebcc64cd | 1227 | *table = compat_sc_table.table; |
12e579db MD |
1228 | return 0; |
1229 | } | |
1230 | ||
2d2464bd MD |
1231 | static |
1232 | int syscall_list_show(struct seq_file *m, void *p) | |
1233 | { | |
1234 | const struct trace_syscall_entry *table, *entry = p; | |
1235 | unsigned int bitness; | |
d4291869 | 1236 | unsigned long index; |
12e579db | 1237 | int ret; |
d4291869 | 1238 | const char *name; |
2d2464bd | 1239 | |
12e579db MD |
1240 | ret = get_sc_table(entry, &table, &bitness); |
1241 | if (ret) | |
1242 | return ret; | |
f4855b46 MD |
1243 | if (!entry->desc) |
1244 | return 0; | |
ebcc64cd | 1245 | if (table == sc_table.table) { |
d4291869 | 1246 | index = entry - table; |
437d5aa5 | 1247 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1248 | } else { |
ebcc64cd | 1249 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1250 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1251 | } |
12e579db | 1252 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1253 | index, name, bitness); |
2d2464bd MD |
1254 | return 0; |
1255 | } | |
1256 | ||
1257 | static | |
1258 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1259 | .start = syscall_list_start, | |
1260 | .next = syscall_list_next, | |
1261 | .stop = syscall_list_stop, | |
1262 | .show = syscall_list_show, | |
1263 | }; | |
1264 | ||
1265 | static | |
1266 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1267 | { | |
1268 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1269 | } | |
1270 | ||
1271 | const struct file_operations lttng_syscall_list_fops = { | |
1272 | .owner = THIS_MODULE, | |
1273 | .open = lttng_syscall_list_open, | |
1274 | .read = seq_read, | |
1275 | .llseek = seq_lseek, | |
1276 | .release = seq_release, | |
1277 | }; | |
12e579db | 1278 | |
badfe9f5 MD |
1279 | /* |
1280 | * A syscall is enabled if it is traced for either entry or exit. | |
1281 | */ | |
c970b655 | 1282 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1283 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1284 | { |
1285 | uint32_t len, sc_tables_len, bitmask_len; | |
1286 | int ret = 0, bit; | |
1287 | char *tmp_mask; | |
1288 | struct lttng_syscall_filter *filter; | |
1289 | ||
1290 | ret = get_user(len, &usyscall_mask->len); | |
1291 | if (ret) | |
1292 | return ret; | |
1293 | sc_tables_len = get_sc_tables_len(); | |
1294 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1295 | if (len < sc_tables_len) { | |
1296 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1297 | } | |
1298 | /* Array is large enough, we can copy array to user-space. */ | |
1299 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1300 | if (!tmp_mask) | |
1301 | return -ENOMEM; | |
0bb716a8 | 1302 | filter = syscall_table->sc_filter; |
12e579db | 1303 | |
ebcc64cd | 1304 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1305 | char state; |
2f25059d | 1306 | |
0bb716a8 MD |
1307 | if (syscall_table->syscall_dispatch) { |
1308 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1309 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1310 | state = test_bit(bit, filter->sc_entry) |
1311 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1312 | else |
1313 | state = 1; | |
1314 | } else { | |
1315 | state = 0; | |
1316 | } | |
1317 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1318 | } |
1319 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1320 | char state; |
2f25059d | 1321 | |
0bb716a8 MD |
1322 | if (syscall_table->compat_syscall_dispatch) { |
1323 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1324 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1325 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1326 | filter->sc_compat_entry) |
ebcc64cd | 1327 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1328 | filter->sc_compat_exit); |
2f25059d MD |
1329 | else |
1330 | state = 1; | |
1331 | } else { | |
1332 | state = 0; | |
1333 | } | |
1334 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1335 | } |
1336 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1337 | ret = -EFAULT; | |
1338 | kfree(tmp_mask); | |
1339 | return ret; | |
1340 | } | |
082d4946 MD |
1341 | |
1342 | int lttng_abi_syscall_list(void) | |
1343 | { | |
1344 | struct file *syscall_list_file; | |
1345 | int file_fd, ret; | |
1346 | ||
4ac10b76 | 1347 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1348 | if (file_fd < 0) { |
1349 | ret = file_fd; | |
1350 | goto fd_error; | |
1351 | } | |
1352 | ||
1353 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1354 | <tng_syscall_list_fops, | |
1355 | NULL, O_RDWR); | |
1356 | if (IS_ERR(syscall_list_file)) { | |
1357 | ret = PTR_ERR(syscall_list_file); | |
1358 | goto file_error; | |
1359 | } | |
1360 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1361 | if (ret < 0) | |
1362 | goto open_error; | |
1363 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1364 | return file_fd; |
1365 | ||
1366 | open_error: | |
1367 | fput(syscall_list_file); | |
1368 | file_error: | |
1369 | put_unused_fd(file_fd); | |
1370 | fd_error: | |
1371 | return ret; | |
1372 | } |