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 | 27 | #include <wrapper/tracepoint.h> |
241ae9a8 | 28 | #include <wrapper/rcu.h> |
1b7b9c65 | 29 | #include <wrapper/syscall.h> |
5987e66c | 30 | #include <wrapper/limits.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 | |
80f87dd2 MD |
68 | #ifdef IA32_NR_syscalls |
69 | #define NR_compat_syscalls IA32_NR_syscalls | |
70 | #else | |
71 | #define NR_compat_syscalls NR_syscalls | |
72 | #endif | |
73 | ||
259b6cb3 MD |
74 | /* |
75 | * Create LTTng tracepoint probes. | |
76 | */ | |
77 | #define LTTNG_PACKAGE_BUILD | |
78 | #define CREATE_TRACE_POINTS | |
2655f9ad | 79 | #define TP_MODULE_NOINIT |
c075712b | 80 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 81 | |
a93244f8 MD |
82 | #define PARAMS(args...) args |
83 | ||
5b7ac358 | 84 | /* Handle unknown syscalls */ |
72a52753 | 85 | #undef TRACE_SYSTEM |
5b7ac358 | 86 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 87 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
88 | #undef TRACE_SYSTEM |
89 | ||
5b7ac358 | 90 | #undef TP_PROBE_CB |
fc4f7161 | 91 | |
e42c4f49 FD |
92 | extern const struct trace_syscall_table sc_table; |
93 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 94 | |
2d6d88c6 | 95 | /* Event syscall exit table */ |
e42c4f49 FD |
96 | extern const struct trace_syscall_table sc_exit_table; |
97 | extern const struct trace_syscall_table compat_sc_exit_table; | |
ebcc64cd FD |
98 | |
99 | ||
fc4f7161 MD |
100 | #undef SC_EXIT |
101 | ||
a93244f8 | 102 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 103 | |
80f87dd2 | 104 | struct lttng_syscall_filter { |
badfe9f5 MD |
105 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
106 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
107 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
108 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
7f52f0d4 MD |
109 | |
110 | /* | |
111 | * Reference counters keeping track of number of events enabled | |
112 | * for each bit. | |
113 | */ | |
114 | u32 sc_entry_refcount_map[NR_syscalls]; | |
115 | u32 sc_exit_refcount_map[NR_syscalls]; | |
116 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
117 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
118 | }; |
119 | ||
3b82c4e1 | 120 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 121 | struct pt_regs *regs, long id) |
f405cfce | 122 | { |
1b7b9c65 | 123 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 124 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 125 | |
1b7b9c65 | 126 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 127 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 128 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 129 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 130 | else |
e2d5dbc7 | 131 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
132 | } |
133 | } | |
134 | ||
63aa9160 | 135 | static __always_inline |
e2d5dbc7 | 136 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 137 | void *func, unsigned int nrargs, |
63aa9160 | 138 | struct pt_regs *regs) |
259b6cb3 | 139 | { |
a67ba386 | 140 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 141 | |
63aa9160 | 142 | switch (nrargs) { |
259b6cb3 MD |
143 | case 0: |
144 | { | |
63aa9160 | 145 | void (*fptr)(void *__data) = func; |
259b6cb3 | 146 | |
e2d5dbc7 MD |
147 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
148 | fptr(event_priv->pub); | |
259b6cb3 MD |
149 | break; |
150 | } | |
151 | case 1: | |
152 | { | |
63aa9160 | 153 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 154 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 155 | |
1b7b9c65 | 156 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
157 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
158 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
159 | break; |
160 | } | |
161 | case 2: | |
162 | { | |
163 | void (*fptr)(void *__data, | |
164 | unsigned long arg0, | |
63aa9160 | 165 | unsigned long arg1) = func; |
1b7b9c65 | 166 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 167 | |
1b7b9c65 | 168 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
169 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
170 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
171 | break; |
172 | } | |
173 | case 3: | |
174 | { | |
175 | void (*fptr)(void *__data, | |
176 | unsigned long arg0, | |
177 | unsigned long arg1, | |
63aa9160 | 178 | unsigned long arg2) = func; |
1b7b9c65 | 179 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 180 | |
1b7b9c65 | 181 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
182 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
183 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
184 | break; |
185 | } | |
186 | case 4: | |
187 | { | |
188 | void (*fptr)(void *__data, | |
189 | unsigned long arg0, | |
190 | unsigned long arg1, | |
191 | unsigned long arg2, | |
63aa9160 | 192 | unsigned long arg3) = func; |
1b7b9c65 | 193 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 194 | |
1b7b9c65 | 195 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
196 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
197 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
198 | break; |
199 | } | |
200 | case 5: | |
201 | { | |
202 | void (*fptr)(void *__data, | |
203 | unsigned long arg0, | |
204 | unsigned long arg1, | |
205 | unsigned long arg2, | |
206 | unsigned long arg3, | |
63aa9160 | 207 | unsigned long arg4) = 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], args[4]); | |
259b6cb3 MD |
213 | break; |
214 | } | |
215 | case 6: | |
216 | { | |
217 | void (*fptr)(void *__data, | |
218 | unsigned long arg0, | |
219 | unsigned long arg1, | |
220 | unsigned long arg2, | |
221 | unsigned long arg3, | |
222 | unsigned long arg4, | |
63aa9160 | 223 | unsigned long arg5) = func; |
1b7b9c65 | 224 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 225 | |
1b7b9c65 | 226 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
227 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
228 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 229 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
230 | break; |
231 | } | |
232 | default: | |
233 | break; | |
234 | } | |
235 | } | |
236 | ||
63aa9160 FD |
237 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
238 | { | |
0bb716a8 | 239 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 240 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
241 | const struct trace_syscall_entry *table, *entry; |
242 | size_t table_len; | |
243 | ||
5b5778b1 MD |
244 | #ifdef CONFIG_X86_X32_ABI |
245 | if (in_x32_syscall()) { | |
246 | /* x32 system calls are not supported. */ | |
247 | return; | |
248 | } | |
249 | #endif | |
63aa9160 | 250 | if (unlikely(in_compat_syscall())) { |
0bb716a8 | 251 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
252 | |
253 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 254 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
255 | /* System call filtered out. */ |
256 | return; | |
257 | } | |
ebcc64cd FD |
258 | table = compat_sc_table.table; |
259 | table_len = compat_sc_table.len; | |
0bb716a8 | 260 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 261 | } else { |
0bb716a8 | 262 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
263 | |
264 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 265 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
266 | /* System call filtered out. */ |
267 | return; | |
268 | } | |
ebcc64cd FD |
269 | table = sc_table.table; |
270 | table_len = sc_table.len; | |
0bb716a8 | 271 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
272 | } |
273 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 274 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
275 | return; |
276 | } | |
3b82c4e1 MD |
277 | |
278 | entry = &table[id]; | |
279 | if (!entry->event_func) { | |
280 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
281 | return; |
282 | } | |
3b82c4e1 MD |
283 | |
284 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 285 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 286 | } else { |
0bb716a8 | 287 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
288 | } |
289 | if (unlikely(hlist_empty(action_list))) | |
290 | return; | |
291 | ||
e2d5dbc7 | 292 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
293 | } |
294 | ||
3b82c4e1 | 295 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 296 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 297 | { |
1b7b9c65 | 298 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 299 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 300 | |
1b7b9c65 | 301 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 302 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 303 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 304 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
305 | args); |
306 | else | |
e2d5dbc7 | 307 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 308 | } |
5b7ac358 MD |
309 | } |
310 | ||
3b82c4e1 | 311 | static __always_inline |
e2d5dbc7 | 312 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
313 | void *func, unsigned int nrargs, |
314 | struct pt_regs *regs, long ret) | |
5b7ac358 | 315 | { |
a67ba386 | 316 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 317 | |
3b82c4e1 | 318 | switch (nrargs) { |
5b7ac358 MD |
319 | case 0: |
320 | { | |
3b82c4e1 | 321 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 322 | |
e2d5dbc7 MD |
323 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
324 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
325 | break; |
326 | } | |
327 | case 1: | |
328 | { | |
329 | void (*fptr)(void *__data, | |
fc4f7161 | 330 | long ret, |
3b82c4e1 | 331 | unsigned long arg0) = func; |
1b7b9c65 | 332 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 333 | |
1b7b9c65 | 334 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
335 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
336 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
337 | break; |
338 | } | |
339 | case 2: | |
340 | { | |
341 | void (*fptr)(void *__data, | |
fc4f7161 | 342 | long ret, |
5b7ac358 | 343 | unsigned long arg0, |
3b82c4e1 | 344 | unsigned long arg1) = func; |
1b7b9c65 | 345 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 346 | |
1b7b9c65 | 347 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
348 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
349 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
350 | break; |
351 | } | |
352 | case 3: | |
353 | { | |
354 | void (*fptr)(void *__data, | |
fc4f7161 | 355 | long ret, |
5b7ac358 MD |
356 | unsigned long arg0, |
357 | unsigned long arg1, | |
3b82c4e1 | 358 | unsigned long arg2) = func; |
1b7b9c65 | 359 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 360 | |
1b7b9c65 | 361 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
362 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
363 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
364 | break; |
365 | } | |
366 | case 4: | |
367 | { | |
368 | void (*fptr)(void *__data, | |
fc4f7161 | 369 | long ret, |
5b7ac358 MD |
370 | unsigned long arg0, |
371 | unsigned long arg1, | |
372 | unsigned long arg2, | |
3b82c4e1 | 373 | unsigned long arg3) = func; |
1b7b9c65 | 374 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 375 | |
1b7b9c65 | 376 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
377 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
378 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
379 | break; |
380 | } | |
381 | case 5: | |
382 | { | |
383 | void (*fptr)(void *__data, | |
fc4f7161 | 384 | long ret, |
5b7ac358 MD |
385 | unsigned long arg0, |
386 | unsigned long arg1, | |
387 | unsigned long arg2, | |
388 | unsigned long arg3, | |
3b82c4e1 | 389 | unsigned long arg4) = func; |
1b7b9c65 | 390 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 391 | |
1b7b9c65 | 392 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
393 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
394 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
395 | break; |
396 | } | |
397 | case 6: | |
398 | { | |
399 | void (*fptr)(void *__data, | |
fc4f7161 | 400 | long ret, |
5b7ac358 MD |
401 | unsigned long arg0, |
402 | unsigned long arg1, | |
403 | unsigned long arg2, | |
404 | unsigned long arg3, | |
405 | unsigned long arg4, | |
3b82c4e1 | 406 | unsigned long arg5) = func; |
1b7b9c65 | 407 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 408 | |
1b7b9c65 | 409 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
410 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
411 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 412 | args[3], args[4], args[5]); |
5b7ac358 MD |
413 | break; |
414 | } | |
415 | default: | |
416 | break; | |
417 | } | |
418 | } | |
419 | ||
3b82c4e1 MD |
420 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
421 | { | |
0bb716a8 | 422 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
423 | struct hlist_head *action_list, *unknown_action_list; |
424 | const struct trace_syscall_entry *table, *entry; | |
425 | size_t table_len; | |
426 | long id; | |
427 | ||
5b5778b1 MD |
428 | #ifdef CONFIG_X86_X32_ABI |
429 | if (in_x32_syscall()) { | |
430 | /* x32 system calls are not supported. */ | |
431 | return; | |
432 | } | |
433 | #endif | |
3b82c4e1 MD |
434 | id = syscall_get_nr(current, regs); |
435 | ||
436 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 437 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
438 | |
439 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 440 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
441 | /* System call filtered out. */ |
442 | return; | |
443 | } | |
ebcc64cd FD |
444 | table = compat_sc_exit_table.table; |
445 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 446 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 447 | } else { |
0bb716a8 | 448 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
449 | |
450 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 451 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
452 | /* System call filtered out. */ |
453 | return; | |
454 | } | |
ebcc64cd FD |
455 | table = sc_exit_table.table; |
456 | table_len = sc_exit_table.len; | |
0bb716a8 | 457 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
458 | } |
459 | if (unlikely(id < 0 || id >= table_len)) { | |
460 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
461 | return; | |
462 | } | |
463 | ||
464 | entry = &table[id]; | |
465 | if (!entry->event_func) { | |
466 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
467 | return; | |
468 | } | |
469 | ||
470 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 471 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 472 | } else { |
0bb716a8 | 473 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
474 | } |
475 | if (unlikely(hlist_empty(action_list))) | |
476 | return; | |
477 | ||
e2d5dbc7 | 478 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
479 | regs, ret); |
480 | } | |
481 | ||
0bb716a8 MD |
482 | static |
483 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 484 | { |
0bb716a8 MD |
485 | switch (event_enabler->enabler_type) { |
486 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
487 | { | |
1ae083ba MD |
488 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
489 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 490 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 491 | } |
0bb716a8 MD |
492 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
493 | { | |
494 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
495 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
496 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 497 | } |
0bb716a8 MD |
498 | default: |
499 | return NULL; | |
8a8ac9a8 | 500 | } |
0bb716a8 | 501 | } |
8a8ac9a8 | 502 | |
0bb716a8 MD |
503 | static |
504 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
505 | { | |
506 | switch (event->type) { | |
507 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
508 | { | |
509 | struct lttng_kernel_event_recorder *event_recorder = | |
510 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
511 | return &event_recorder->chan->priv->parent.syscall_table; | |
512 | } | |
513 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
514 | { | |
515 | struct lttng_kernel_event_notifier *event_notifier = | |
516 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
517 | return &event_notifier->priv->group->syscall_table; | |
518 | } | |
519 | default: | |
520 | return NULL; | |
8a8ac9a8 | 521 | } |
8a8ac9a8 | 522 | } |
0bb716a8 | 523 | |
5408b6d6 MD |
524 | static |
525 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
99903379 | 526 | const struct lttng_kernel_event_desc *desc, enum sc_type type, unsigned int syscall_nr) |
5408b6d6 MD |
527 | { |
528 | struct lttng_kernel_event_common *event; | |
529 | ||
530 | switch (syscall_event_enabler->enabler_type) { | |
531 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
532 | { | |
533 | struct lttng_event_recorder_enabler *syscall_event_recorder_enabler = | |
534 | container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
535 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
536 | struct lttng_kernel_abi_event ev; | |
537 | ||
538 | /* We need to create an event for this syscall/enabler. */ | |
539 | memset(&ev, 0, sizeof(ev)); | |
540 | switch (type) { | |
541 | case SC_TYPE_ENTRY: | |
542 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
543 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
544 | break; | |
545 | case SC_TYPE_EXIT: | |
546 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
547 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
548 | break; | |
549 | case SC_TYPE_COMPAT_ENTRY: | |
550 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
551 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
552 | break; | |
553 | case SC_TYPE_COMPAT_EXIT: | |
554 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
555 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
556 | break; | |
557 | } | |
558 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); | |
559 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
560 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
561 | event_recorder_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, | |
562 | syscall_event_recorder_enabler->chan); | |
563 | WARN_ON_ONCE(!event_recorder_enabler); | |
564 | if (!event_recorder_enabler) | |
565 | return; | |
566 | event = _lttng_kernel_event_create(&event_recorder_enabler->parent, desc); | |
c3fb484e | 567 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 568 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
c3fb484e | 569 | if (IS_ERR(event)) { |
5408b6d6 MD |
570 | printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name); |
571 | return; | |
572 | } | |
9cd106a6 | 573 | event->priv->u.syscall.syscall_id = syscall_nr; |
5408b6d6 MD |
574 | break; |
575 | } | |
576 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
577 | { | |
578 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
579 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
580 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
581 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
582 | uint64_t user_token = syscall_event_enabler->user_token; | |
583 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
584 | ||
585 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
586 | switch (type) { | |
587 | case SC_TYPE_ENTRY: | |
588 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
589 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
590 | break; | |
591 | case SC_TYPE_EXIT: | |
592 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
593 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
594 | break; | |
595 | case SC_TYPE_COMPAT_ENTRY: | |
596 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
597 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
598 | break; | |
599 | case SC_TYPE_COMPAT_EXIT: | |
600 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
601 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
602 | break; | |
603 | } | |
604 | strncat(event_notifier_param.event.name, desc->event_name, | |
605 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
606 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
607 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
608 | event_notifier_param.event.token = user_token; | |
609 | event_notifier_param.error_counter_index = error_counter_index; | |
610 | ||
611 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
612 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
613 | WARN_ON_ONCE(!event_notifier_enabler); | |
614 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); | |
c3fb484e | 615 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 616 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 617 | if (IS_ERR(event)) { |
5408b6d6 MD |
618 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
619 | return; | |
620 | } | |
621 | event->priv->u.syscall.syscall_id = syscall_nr; | |
622 | break; | |
623 | } | |
624 | default: | |
625 | break; | |
626 | } | |
627 | } | |
628 | ||
49c50022 | 629 | static |
67233a18 MD |
630 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
631 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 632 | { |
063f0825 MD |
633 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common); |
634 | const struct lttng_kernel_event_desc *desc; | |
259b6cb3 | 635 | unsigned int i; |
49c50022 | 636 | |
1d303f69 MD |
637 | #ifndef CONFIG_COMPAT |
638 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 639 | return; |
1d303f69 | 640 | #endif |
67233a18 | 641 | /* iterate over all syscall and create event that match */ |
49c50022 | 642 | for (i = 0; i < table_len; i++) { |
19bef247 | 643 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 644 | struct hlist_head *head; |
6768203a | 645 | bool found = false; |
49c50022 | 646 | |
063f0825 | 647 | desc = table[i].desc; |
49c50022 MD |
648 | if (!desc) { |
649 | /* Unknown syscall */ | |
650 | continue; | |
651 | } | |
063f0825 MD |
652 | |
653 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 654 | continue; |
063f0825 | 655 | |
49c50022 | 656 | /* |
3b82c4e1 | 657 | * Check if already created. |
49c50022 | 658 | */ |
0def9170 | 659 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 660 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
6768203a MD |
661 | if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) { |
662 | found = true; | |
663 | break; | |
664 | } | |
3b82c4e1 MD |
665 | } |
666 | if (found) | |
49c50022 | 667 | continue; |
3b82c4e1 | 668 | |
99903379 | 669 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, type, i); |
49c50022 | 670 | } |
49c50022 MD |
671 | } |
672 | ||
552f7c79 MD |
673 | static |
674 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
675 | { | |
676 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
677 | return false; | |
678 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
679 | return false; | |
680 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
681 | return false; | |
682 | if (strcmp(event_enabler->event_param.name, "*")) | |
683 | return false; | |
684 | return true; | |
685 | } | |
686 | ||
9f6f4507 MD |
687 | static |
688 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
689 | { | |
9f6f4507 MD |
690 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
691 | struct lttng_kernel_event_common_private *event_priv; | |
692 | const struct lttng_kernel_event_desc *desc; | |
9f6f4507 MD |
693 | bool found = false; |
694 | struct hlist_head *head; | |
695 | ||
1d303f69 MD |
696 | #ifndef CONFIG_COMPAT |
697 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 698 | return; |
1d303f69 | 699 | #endif |
552f7c79 MD |
700 | /* |
701 | * Considering that currently system calls can only be enabled on a per | |
702 | * name basis (or wildcard based on a name), unknown syscall events are | |
703 | * only used when matching *all* system calls, because this is the only | |
704 | * case which can be associated with an unknown system call. | |
705 | * | |
706 | * When enabling system call on a per system call number basis will be | |
707 | * supported, this will need to be revisited. | |
708 | */ | |
709 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
710 | return; | |
711 | ||
9f6f4507 MD |
712 | switch (type) { |
713 | case SC_TYPE_ENTRY: | |
714 | desc = &__event_desc___syscall_entry_unknown; | |
9f6f4507 MD |
715 | break; |
716 | case SC_TYPE_EXIT: | |
717 | desc = &__event_desc___syscall_exit_unknown; | |
9f6f4507 MD |
718 | break; |
719 | case SC_TYPE_COMPAT_ENTRY: | |
720 | desc = &__event_desc___compat_syscall_entry_unknown; | |
9f6f4507 MD |
721 | break; |
722 | case SC_TYPE_COMPAT_EXIT: | |
723 | desc = &__event_desc___compat_syscall_exit_unknown; | |
9f6f4507 MD |
724 | break; |
725 | default: | |
726 | WARN_ON_ONCE(1); | |
727 | } | |
728 | ||
729 | /* | |
730 | * Check if already created. | |
731 | */ | |
732 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); | |
733 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { | |
6768203a | 734 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
9f6f4507 | 735 | found = true; |
6768203a MD |
736 | break; |
737 | } | |
9f6f4507 MD |
738 | } |
739 | if (!found) | |
99903379 | 740 | lttng_syscall_event_enabler_create_event(event_enabler, desc, type, -1U); |
9f6f4507 MD |
741 | } |
742 | ||
d26015f6 | 743 | static |
15a00134 | 744 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 745 | { |
15a00134 | 746 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 747 | |
15a00134 MD |
748 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
749 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
750 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
751 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
752 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
753 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
754 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
755 | } | |
1ab4126a | 756 | |
15a00134 MD |
757 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
758 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
759 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
760 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
761 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
762 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
763 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
764 | } | |
259b6cb3 MD |
765 | } |
766 | ||
767 | /* | |
8a8ac9a8 FD |
768 | * Should be called with sessions lock held. |
769 | */ | |
b2f63bde | 770 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 771 | { |
d26015f6 MD |
772 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
773 | int ret; | |
8a8ac9a8 | 774 | |
0bb716a8 | 775 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 776 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
777 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
778 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 779 | return -ENOMEM; |
8a8ac9a8 | 780 | } |
0bb716a8 | 781 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
782 | /* create syscall table mapping syscall to events */ |
783 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 784 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 785 | return -ENOMEM; |
8a8ac9a8 FD |
786 | } |
787 | ||
788 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 789 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 790 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
791 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
792 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 793 | return -ENOMEM; |
8a8ac9a8 FD |
794 | } |
795 | ||
0bb716a8 | 796 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
797 | /* create syscall table mapping compat syscall to events */ |
798 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 799 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 800 | return -ENOMEM; |
8a8ac9a8 FD |
801 | } |
802 | #endif | |
0bb716a8 MD |
803 | if (!syscall_table->sc_filter) { |
804 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 805 | GFP_KERNEL); |
0bb716a8 | 806 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
807 | return -ENOMEM; |
808 | } | |
809 | ||
0bb716a8 | 810 | if (!syscall_table->sys_enter_registered) { |
a6837bed | 811 | ret = lttng_tracepoint_probe_register("sys_enter", |
0bb716a8 | 812 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
813 | if (ret) |
814 | return ret; | |
0bb716a8 | 815 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 816 | } |
0bb716a8 | 817 | if (!syscall_table->sys_exit_registered) { |
a6837bed | 818 | ret = lttng_tracepoint_probe_register("sys_exit", |
0bb716a8 | 819 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 | 820 | if (ret) { |
a6837bed | 821 | WARN_ON_ONCE(lttng_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 822 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
823 | return ret; |
824 | } | |
0bb716a8 | 825 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 826 | } |
0fab709d | 827 | |
86e12a51 MD |
828 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
829 | ||
fad51c94 | 830 | return 0; |
8a8ac9a8 FD |
831 | } |
832 | ||
6053e75e | 833 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
834 | { |
835 | int ret; | |
836 | ||
0bb716a8 | 837 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 838 | return 0; |
0bb716a8 | 839 | if (syscall_table->sys_enter_registered) { |
a6837bed | 840 | ret = lttng_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 841 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
842 | if (ret) |
843 | return ret; | |
0bb716a8 | 844 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 845 | } |
0bb716a8 | 846 | if (syscall_table->sys_exit_registered) { |
a6837bed | 847 | ret = lttng_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 848 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
849 | if (ret) |
850 | return ret; | |
0bb716a8 | 851 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 852 | } |
badfe9f5 MD |
853 | return 0; |
854 | } | |
855 | ||
6053e75e | 856 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 857 | { |
0bb716a8 MD |
858 | kfree(syscall_table->syscall_dispatch); |
859 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 860 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
861 | kfree(syscall_table->compat_syscall_dispatch); |
862 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 863 | #endif |
0bb716a8 | 864 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
865 | return 0; |
866 | } | |
867 | ||
12e579db MD |
868 | static |
869 | uint32_t get_sc_tables_len(void) | |
870 | { | |
ebcc64cd | 871 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
872 | } |
873 | ||
badfe9f5 | 874 | static |
ade8a729 FD |
875 | const char *get_syscall_name(const char *desc_name, |
876 | enum lttng_syscall_abi abi, | |
877 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 878 | { |
badfe9f5 | 879 | size_t prefix_len = 0; |
80f87dd2 | 880 | |
80f87dd2 | 881 | |
ade8a729 | 882 | switch (entryexit) { |
badfe9f5 | 883 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 884 | switch (abi) { |
badfe9f5 MD |
885 | case LTTNG_SYSCALL_ABI_NATIVE: |
886 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
887 | break; | |
888 | case LTTNG_SYSCALL_ABI_COMPAT: | |
889 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
890 | break; | |
80f87dd2 | 891 | } |
badfe9f5 MD |
892 | break; |
893 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 894 | switch (abi) { |
badfe9f5 MD |
895 | case LTTNG_SYSCALL_ABI_NATIVE: |
896 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
897 | break; | |
898 | case LTTNG_SYSCALL_ABI_COMPAT: | |
899 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
900 | break; | |
80f87dd2 | 901 | } |
badfe9f5 | 902 | break; |
80f87dd2 | 903 | } |
badfe9f5 | 904 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 905 | return desc_name + prefix_len; |
badfe9f5 MD |
906 | } |
907 | ||
ade8a729 FD |
908 | static |
909 | int lttng_syscall_filter_enable( | |
910 | struct lttng_syscall_filter *filter, | |
911 | const char *desc_name, enum lttng_syscall_abi abi, | |
99903379 MD |
912 | enum lttng_syscall_entryexit entryexit, |
913 | unsigned int syscall_id) | |
badfe9f5 | 914 | { |
badfe9f5 MD |
915 | const char *syscall_name; |
916 | unsigned long *bitmap; | |
7f52f0d4 | 917 | u32 *refcount_map; |
badfe9f5 | 918 | |
ade8a729 | 919 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 920 | |
ade8a729 | 921 | switch (entryexit) { |
badfe9f5 | 922 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 923 | switch (abi) { |
badfe9f5 MD |
924 | case LTTNG_SYSCALL_ABI_NATIVE: |
925 | bitmap = filter->sc_entry; | |
7f52f0d4 | 926 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
927 | break; |
928 | case LTTNG_SYSCALL_ABI_COMPAT: | |
929 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 930 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 931 | break; |
6d9694d8 MD |
932 | default: |
933 | return -EINVAL; | |
80f87dd2 | 934 | } |
badfe9f5 MD |
935 | break; |
936 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 937 | switch (abi) { |
badfe9f5 MD |
938 | case LTTNG_SYSCALL_ABI_NATIVE: |
939 | bitmap = filter->sc_exit; | |
7f52f0d4 | 940 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
941 | break; |
942 | case LTTNG_SYSCALL_ABI_COMPAT: | |
943 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 944 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 945 | break; |
6d9694d8 MD |
946 | default: |
947 | return -EINVAL; | |
80f87dd2 | 948 | } |
badfe9f5 MD |
949 | break; |
950 | default: | |
951 | return -EINVAL; | |
80f87dd2 | 952 | } |
99903379 | 953 | if (refcount_map[syscall_id] == U32_MAX) |
7f52f0d4 | 954 | return -EOVERFLOW; |
99903379 MD |
955 | if (refcount_map[syscall_id]++ == 0) |
956 | bitmap_set(bitmap, syscall_id, 1); | |
80f87dd2 | 957 | return 0; |
80f87dd2 MD |
958 | } |
959 | ||
9b2f1c54 | 960 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 961 | { |
9b2f1c54 | 962 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
963 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
964 | struct hlist_head *dispatch_list; | |
ca62543e | 965 | int ret = 0; |
8a8ac9a8 | 966 | |
9b2f1c54 | 967 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 968 | |
99903379 MD |
969 | /* Unknown syscall */ |
970 | if (syscall_id == -1U) { | |
971 | switch (event->priv->u.syscall.entryexit) { | |
972 | case LTTNG_SYSCALL_ENTRY: | |
973 | switch (event->priv->u.syscall.abi) { | |
974 | case LTTNG_SYSCALL_ABI_NATIVE: | |
975 | dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
976 | break; | |
977 | case LTTNG_SYSCALL_ABI_COMPAT: | |
978 | dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
979 | break; | |
980 | default: | |
981 | ret = -EINVAL; | |
982 | goto end; | |
983 | } | |
9cd106a6 | 984 | break; |
99903379 MD |
985 | case LTTNG_SYSCALL_EXIT: |
986 | switch (event->priv->u.syscall.abi) { | |
987 | case LTTNG_SYSCALL_ABI_NATIVE: | |
988 | dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
989 | break; | |
990 | case LTTNG_SYSCALL_ABI_COMPAT: | |
991 | dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
992 | break; | |
993 | default: | |
994 | ret = -EINVAL; | |
995 | goto end; | |
996 | } | |
9cd106a6 MD |
997 | break; |
998 | default: | |
999 | ret = -EINVAL; | |
1000 | goto end; | |
1001 | } | |
99903379 MD |
1002 | } else { |
1003 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, | |
1004 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1005 | event->priv->u.syscall.entryexit, syscall_id); | |
1006 | if (ret) | |
1007 | return ret; | |
1008 | ||
1009 | switch (event->priv->u.syscall.entryexit) { | |
1010 | case LTTNG_SYSCALL_ENTRY: | |
1011 | switch (event->priv->u.syscall.abi) { | |
1012 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1013 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1014 | break; | |
1015 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1016 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1017 | break; | |
1018 | default: | |
1019 | ret = -EINVAL; | |
1020 | goto end; | |
1021 | } | |
8a8ac9a8 | 1022 | break; |
99903379 MD |
1023 | case LTTNG_SYSCALL_EXIT: |
1024 | switch (event->priv->u.syscall.abi) { | |
1025 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1026 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1027 | break; | |
1028 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1029 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1030 | break; | |
1031 | default: | |
1032 | ret = -EINVAL; | |
1033 | goto end; | |
1034 | } | |
8a8ac9a8 | 1035 | break; |
6866b1c7 MJ |
1036 | default: |
1037 | ret = -EINVAL; | |
1038 | goto end; | |
8a8ac9a8 | 1039 | } |
8a8ac9a8 | 1040 | } |
9cd106a6 MD |
1041 | |
1042 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1043 | end: |
9b2f1c54 | 1044 | return ret; |
ade8a729 FD |
1045 | } |
1046 | ||
1047 | static | |
f2db8be3 | 1048 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 | 1049 | const char *desc_name, enum lttng_syscall_abi abi, |
99903379 MD |
1050 | enum lttng_syscall_entryexit entryexit, |
1051 | unsigned int syscall_id) | |
ade8a729 | 1052 | { |
badfe9f5 MD |
1053 | const char *syscall_name; |
1054 | unsigned long *bitmap; | |
7f52f0d4 | 1055 | u32 *refcount_map; |
80f87dd2 | 1056 | |
ade8a729 | 1057 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1058 | |
ade8a729 | 1059 | switch (entryexit) { |
badfe9f5 | 1060 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1061 | switch (abi) { |
badfe9f5 MD |
1062 | case LTTNG_SYSCALL_ABI_NATIVE: |
1063 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1064 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1065 | break; |
1066 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1067 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1068 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1069 | break; |
6d9694d8 MD |
1070 | default: |
1071 | return -EINVAL; | |
80f87dd2 | 1072 | } |
badfe9f5 MD |
1073 | break; |
1074 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1075 | switch (abi) { |
badfe9f5 MD |
1076 | case LTTNG_SYSCALL_ABI_NATIVE: |
1077 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1078 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1079 | break; |
1080 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1081 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1082 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1083 | break; |
6d9694d8 MD |
1084 | default: |
1085 | return -EINVAL; | |
80f87dd2 | 1086 | } |
badfe9f5 MD |
1087 | break; |
1088 | default: | |
1089 | return -EINVAL; | |
80f87dd2 | 1090 | } |
99903379 | 1091 | if (refcount_map[syscall_id] == 0) |
7f52f0d4 | 1092 | return -ENOENT; |
99903379 MD |
1093 | if (--refcount_map[syscall_id] == 0) |
1094 | bitmap_clear(bitmap, syscall_id, 1); | |
badfe9f5 | 1095 | return 0; |
259b6cb3 | 1096 | } |
2d2464bd | 1097 | |
9b2f1c54 | 1098 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1099 | { |
9b2f1c54 | 1100 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
7f52f0d4 | 1101 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
8a8ac9a8 FD |
1102 | int ret; |
1103 | ||
99903379 MD |
1104 | /* Except for unknown syscall */ |
1105 | if (syscall_id != -1U) { | |
1106 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, | |
1107 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1108 | event->priv->u.syscall.entryexit, syscall_id); | |
1109 | if (ret) | |
1110 | return ret; | |
1111 | } | |
9cd106a6 | 1112 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1113 | return 0; |
1114 | } | |
1115 | ||
9cb5be7e MD |
1116 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1117 | { | |
1118 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1119 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1120 | int enabled = event_enabler->enabled; | |
1121 | ||
552f7c79 | 1122 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1123 | return; |
9cb5be7e MD |
1124 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1125 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1126 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1127 | ||
1128 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1129 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1130 | } | |
1131 | ||
2d2464bd MD |
1132 | static |
1133 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1134 | { | |
1135 | const struct trace_syscall_entry *entry; | |
1136 | int iter = 0; | |
1137 | ||
ebcc64cd FD |
1138 | for (entry = sc_table.table; |
1139 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1140 | entry++) { |
1141 | if (iter++ >= *pos) | |
1142 | return entry; | |
1143 | } | |
ebcc64cd FD |
1144 | for (entry = compat_sc_table.table; |
1145 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1146 | entry++) { |
1147 | if (iter++ >= *pos) | |
1148 | return entry; | |
1149 | } | |
1150 | /* End of list */ | |
1151 | return NULL; | |
1152 | } | |
1153 | ||
1154 | static | |
1155 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1156 | { | |
1157 | return (void *) syscall_list_get_entry(pos); | |
1158 | } | |
1159 | ||
1160 | static | |
1161 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1162 | { | |
1163 | (*ppos)++; | |
1164 | return (void *) syscall_list_get_entry(ppos); | |
1165 | } | |
1166 | ||
1167 | static | |
1168 | void syscall_list_stop(struct seq_file *m, void *p) | |
1169 | { | |
1170 | } | |
1171 | ||
12e579db MD |
1172 | static |
1173 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1174 | const struct trace_syscall_entry **table, | |
1175 | unsigned int *bitness) | |
1176 | { | |
ebcc64cd | 1177 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1178 | if (bitness) |
1179 | *bitness = BITS_PER_LONG; | |
1180 | if (table) | |
ebcc64cd | 1181 | *table = sc_table.table; |
12e579db MD |
1182 | return 0; |
1183 | } | |
ebcc64cd FD |
1184 | if (!(entry >= compat_sc_table.table |
1185 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1186 | return -EINVAL; |
1187 | } | |
1188 | if (bitness) | |
1189 | *bitness = 32; | |
1190 | if (table) | |
ebcc64cd | 1191 | *table = compat_sc_table.table; |
12e579db MD |
1192 | return 0; |
1193 | } | |
1194 | ||
2d2464bd MD |
1195 | static |
1196 | int syscall_list_show(struct seq_file *m, void *p) | |
1197 | { | |
1198 | const struct trace_syscall_entry *table, *entry = p; | |
1199 | unsigned int bitness; | |
d4291869 | 1200 | unsigned long index; |
12e579db | 1201 | int ret; |
d4291869 | 1202 | const char *name; |
2d2464bd | 1203 | |
12e579db MD |
1204 | ret = get_sc_table(entry, &table, &bitness); |
1205 | if (ret) | |
1206 | return ret; | |
f4855b46 MD |
1207 | if (!entry->desc) |
1208 | return 0; | |
ebcc64cd | 1209 | if (table == sc_table.table) { |
d4291869 | 1210 | index = entry - table; |
437d5aa5 | 1211 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1212 | } else { |
ebcc64cd | 1213 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1214 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1215 | } |
12e579db | 1216 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1217 | index, name, bitness); |
2d2464bd MD |
1218 | return 0; |
1219 | } | |
1220 | ||
1221 | static | |
1222 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1223 | .start = syscall_list_start, | |
1224 | .next = syscall_list_next, | |
1225 | .stop = syscall_list_stop, | |
1226 | .show = syscall_list_show, | |
1227 | }; | |
1228 | ||
1229 | static | |
1230 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1231 | { | |
1232 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1233 | } | |
1234 | ||
1235 | const struct file_operations lttng_syscall_list_fops = { | |
1236 | .owner = THIS_MODULE, | |
1237 | .open = lttng_syscall_list_open, | |
1238 | .read = seq_read, | |
1239 | .llseek = seq_lseek, | |
1240 | .release = seq_release, | |
1241 | }; | |
12e579db | 1242 | |
badfe9f5 MD |
1243 | /* |
1244 | * A syscall is enabled if it is traced for either entry or exit. | |
1245 | */ | |
c970b655 | 1246 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1247 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1248 | { |
1249 | uint32_t len, sc_tables_len, bitmask_len; | |
1250 | int ret = 0, bit; | |
1251 | char *tmp_mask; | |
1252 | struct lttng_syscall_filter *filter; | |
1253 | ||
1254 | ret = get_user(len, &usyscall_mask->len); | |
1255 | if (ret) | |
1256 | return ret; | |
1257 | sc_tables_len = get_sc_tables_len(); | |
1258 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1259 | if (len < sc_tables_len) { | |
1260 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1261 | } | |
1262 | /* Array is large enough, we can copy array to user-space. */ | |
1263 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1264 | if (!tmp_mask) | |
1265 | return -ENOMEM; | |
0bb716a8 | 1266 | filter = syscall_table->sc_filter; |
12e579db | 1267 | |
ebcc64cd | 1268 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1269 | char state; |
2f25059d | 1270 | |
0bb716a8 MD |
1271 | if (syscall_table->syscall_dispatch) { |
1272 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1273 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1274 | state = test_bit(bit, filter->sc_entry) |
1275 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1276 | else |
1277 | state = 1; | |
1278 | } else { | |
1279 | state = 0; | |
1280 | } | |
1281 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1282 | } |
1283 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1284 | char state; |
2f25059d | 1285 | |
0bb716a8 MD |
1286 | if (syscall_table->compat_syscall_dispatch) { |
1287 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1288 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1289 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1290 | filter->sc_compat_entry) |
ebcc64cd | 1291 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1292 | filter->sc_compat_exit); |
2f25059d MD |
1293 | else |
1294 | state = 1; | |
1295 | } else { | |
1296 | state = 0; | |
1297 | } | |
1298 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1299 | } |
1300 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1301 | ret = -EFAULT; | |
1302 | kfree(tmp_mask); | |
1303 | return ret; | |
1304 | } | |
082d4946 MD |
1305 | |
1306 | int lttng_abi_syscall_list(void) | |
1307 | { | |
1308 | struct file *syscall_list_file; | |
1309 | int file_fd, ret; | |
1310 | ||
2a059b14 | 1311 | file_fd = get_unused_fd_flags(0); |
082d4946 MD |
1312 | if (file_fd < 0) { |
1313 | ret = file_fd; | |
1314 | goto fd_error; | |
1315 | } | |
1316 | ||
1317 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1318 | <tng_syscall_list_fops, | |
1319 | NULL, O_RDWR); | |
1320 | if (IS_ERR(syscall_list_file)) { | |
1321 | ret = PTR_ERR(syscall_list_file); | |
1322 | goto file_error; | |
1323 | } | |
1324 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1325 | if (ret < 0) | |
1326 | goto open_error; | |
1327 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1328 | return file_fd; |
1329 | ||
1330 | open_error: | |
1331 | fput(syscall_list_file); | |
1332 | file_error: | |
1333 | put_unused_fd(file_fd); | |
1334 | fd_error: | |
1335 | return ret; | |
1336 | } |