Commit | Line | Data |
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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> |
5987e66c | 31 | #include <wrapper/limits.h> |
2df37e95 | 32 | #include <lttng/events.h> |
6f156b09 | 33 | #include <lttng/events-internal.h> |
8a8ac9a8 | 34 | #include <lttng/utils.h> |
259b6cb3 | 35 | |
ebcc64cd FD |
36 | #include "lttng-syscalls.h" |
37 | ||
6333ace3 | 38 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
39 | # ifndef is_compat_task |
40 | # define is_compat_task() (0) | |
41 | # endif | |
6333ace3 MD |
42 | #endif |
43 | ||
1aa3298b MD |
44 | /* in_compat_syscall appears in kernel 4.6. */ |
45 | #ifndef in_compat_syscall | |
46 | #define in_compat_syscall() is_compat_task() | |
47 | #endif | |
48 | ||
5b7ac358 MD |
49 | enum sc_type { |
50 | SC_TYPE_ENTRY, | |
51 | SC_TYPE_EXIT, | |
52 | SC_TYPE_COMPAT_ENTRY, | |
53 | SC_TYPE_COMPAT_EXIT, | |
54 | }; | |
55 | ||
d4291869 MD |
56 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
57 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
58 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
59 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
60 | ||
61 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
62 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
63 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
64 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 65 | |
2d6d88c6 | 66 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
2d6d88c6 | 67 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 68 | |
3a523f5b MD |
69 | /* |
70 | * Forward declarations for old kernels. | |
71 | */ | |
72 | struct mmsghdr; | |
73 | struct rlimit64; | |
74 | struct oldold_utsname; | |
75 | struct old_utsname; | |
76 | struct sel_arg_struct; | |
77 | struct mmap_arg_struct; | |
c0b71117 | 78 | struct file_handle; |
a292e6f1 | 79 | struct user_msghdr; |
3a523f5b | 80 | |
9eb15e8b MJ |
81 | /* |
82 | * Forward declaration for kernels >= 5.6 | |
83 | */ | |
84 | struct timex; | |
edfdcb68 MJ |
85 | struct timeval; |
86 | struct itimerval; | |
87 | struct itimerspec; | |
88 | ||
5f4c791e | 89 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
90 | typedef __kernel_old_time_t time_t; |
91 | #endif | |
9eb15e8b | 92 | |
80f87dd2 MD |
93 | #ifdef IA32_NR_syscalls |
94 | #define NR_compat_syscalls IA32_NR_syscalls | |
95 | #else | |
96 | #define NR_compat_syscalls NR_syscalls | |
97 | #endif | |
98 | ||
259b6cb3 MD |
99 | /* |
100 | * Create LTTng tracepoint probes. | |
101 | */ | |
102 | #define LTTNG_PACKAGE_BUILD | |
103 | #define CREATE_TRACE_POINTS | |
2655f9ad | 104 | #define TP_MODULE_NOINIT |
c075712b | 105 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 106 | |
a93244f8 MD |
107 | #define PARAMS(args...) args |
108 | ||
5b7ac358 | 109 | /* Handle unknown syscalls */ |
72a52753 | 110 | #undef TRACE_SYSTEM |
5b7ac358 | 111 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 112 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
113 | #undef TRACE_SYSTEM |
114 | ||
5b7ac358 | 115 | #undef TP_PROBE_CB |
fc4f7161 | 116 | |
e42c4f49 FD |
117 | extern const struct trace_syscall_table sc_table; |
118 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 119 | |
2d6d88c6 | 120 | /* Event syscall exit table */ |
e42c4f49 FD |
121 | extern const struct trace_syscall_table sc_exit_table; |
122 | extern const struct trace_syscall_table compat_sc_exit_table; | |
ebcc64cd FD |
123 | |
124 | ||
fc4f7161 MD |
125 | #undef SC_EXIT |
126 | ||
a93244f8 | 127 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 128 | |
80f87dd2 | 129 | struct lttng_syscall_filter { |
badfe9f5 MD |
130 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
131 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
132 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
133 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
7f52f0d4 MD |
134 | |
135 | /* | |
136 | * Reference counters keeping track of number of events enabled | |
137 | * for each bit. | |
138 | */ | |
139 | u32 sc_entry_refcount_map[NR_syscalls]; | |
140 | u32 sc_exit_refcount_map[NR_syscalls]; | |
141 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
142 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
143 | }; |
144 | ||
3b82c4e1 | 145 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 146 | struct pt_regs *regs, long id) |
f405cfce | 147 | { |
1b7b9c65 | 148 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 149 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 150 | |
1b7b9c65 | 151 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 152 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 153 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 154 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 155 | else |
e2d5dbc7 | 156 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
157 | } |
158 | } | |
159 | ||
63aa9160 | 160 | static __always_inline |
e2d5dbc7 | 161 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 162 | void *func, unsigned int nrargs, |
63aa9160 | 163 | struct pt_regs *regs) |
259b6cb3 | 164 | { |
a67ba386 | 165 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 166 | |
63aa9160 | 167 | switch (nrargs) { |
259b6cb3 MD |
168 | case 0: |
169 | { | |
63aa9160 | 170 | void (*fptr)(void *__data) = func; |
259b6cb3 | 171 | |
e2d5dbc7 MD |
172 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
173 | fptr(event_priv->pub); | |
259b6cb3 MD |
174 | break; |
175 | } | |
176 | case 1: | |
177 | { | |
63aa9160 | 178 | void (*fptr)(void *__data, unsigned long arg0) = 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]); | |
259b6cb3 MD |
184 | break; |
185 | } | |
186 | case 2: | |
187 | { | |
188 | void (*fptr)(void *__data, | |
189 | unsigned long arg0, | |
63aa9160 | 190 | unsigned long arg1) = func; |
1b7b9c65 | 191 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 192 | |
1b7b9c65 | 193 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
194 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
195 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
196 | break; |
197 | } | |
198 | case 3: | |
199 | { | |
200 | void (*fptr)(void *__data, | |
201 | unsigned long arg0, | |
202 | unsigned long arg1, | |
63aa9160 | 203 | unsigned long arg2) = func; |
1b7b9c65 | 204 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 205 | |
1b7b9c65 | 206 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
207 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
208 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
209 | break; |
210 | } | |
211 | case 4: | |
212 | { | |
213 | void (*fptr)(void *__data, | |
214 | unsigned long arg0, | |
215 | unsigned long arg1, | |
216 | unsigned long arg2, | |
63aa9160 | 217 | unsigned long arg3) = func; |
1b7b9c65 | 218 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 219 | |
1b7b9c65 | 220 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
221 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
222 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
223 | break; |
224 | } | |
225 | case 5: | |
226 | { | |
227 | void (*fptr)(void *__data, | |
228 | unsigned long arg0, | |
229 | unsigned long arg1, | |
230 | unsigned long arg2, | |
231 | unsigned long arg3, | |
63aa9160 | 232 | unsigned long arg4) = func; |
1b7b9c65 | 233 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 234 | |
1b7b9c65 | 235 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
236 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
237 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
238 | break; |
239 | } | |
240 | case 6: | |
241 | { | |
242 | void (*fptr)(void *__data, | |
243 | unsigned long arg0, | |
244 | unsigned long arg1, | |
245 | unsigned long arg2, | |
246 | unsigned long arg3, | |
247 | unsigned long arg4, | |
63aa9160 | 248 | unsigned long arg5) = func; |
1b7b9c65 | 249 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 250 | |
1b7b9c65 | 251 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
252 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
253 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 254 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
255 | break; |
256 | } | |
257 | default: | |
258 | break; | |
259 | } | |
260 | } | |
261 | ||
63aa9160 FD |
262 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
263 | { | |
0bb716a8 | 264 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 265 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
266 | const struct trace_syscall_entry *table, *entry; |
267 | size_t table_len; | |
268 | ||
269 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 270 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
271 | |
272 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 273 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
274 | /* System call filtered out. */ |
275 | return; | |
276 | } | |
ebcc64cd FD |
277 | table = compat_sc_table.table; |
278 | table_len = compat_sc_table.len; | |
0bb716a8 | 279 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 280 | } else { |
0bb716a8 | 281 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
282 | |
283 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 284 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
285 | /* System call filtered out. */ |
286 | return; | |
287 | } | |
ebcc64cd FD |
288 | table = sc_table.table; |
289 | table_len = sc_table.len; | |
0bb716a8 | 290 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
291 | } |
292 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 293 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
294 | return; |
295 | } | |
3b82c4e1 MD |
296 | |
297 | entry = &table[id]; | |
298 | if (!entry->event_func) { | |
299 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
300 | return; |
301 | } | |
3b82c4e1 MD |
302 | |
303 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 304 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 305 | } else { |
0bb716a8 | 306 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
307 | } |
308 | if (unlikely(hlist_empty(action_list))) | |
309 | return; | |
310 | ||
e2d5dbc7 | 311 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
312 | } |
313 | ||
3b82c4e1 | 314 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 315 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 316 | { |
1b7b9c65 | 317 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 318 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 319 | |
1b7b9c65 | 320 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 321 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 322 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 323 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
324 | args); |
325 | else | |
e2d5dbc7 | 326 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 327 | } |
5b7ac358 MD |
328 | } |
329 | ||
3b82c4e1 | 330 | static __always_inline |
e2d5dbc7 | 331 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
332 | void *func, unsigned int nrargs, |
333 | struct pt_regs *regs, long ret) | |
5b7ac358 | 334 | { |
a67ba386 | 335 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 336 | |
3b82c4e1 | 337 | switch (nrargs) { |
5b7ac358 MD |
338 | case 0: |
339 | { | |
3b82c4e1 | 340 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 341 | |
e2d5dbc7 MD |
342 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
343 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
344 | break; |
345 | } | |
346 | case 1: | |
347 | { | |
348 | void (*fptr)(void *__data, | |
fc4f7161 | 349 | long ret, |
3b82c4e1 | 350 | unsigned long arg0) = func; |
1b7b9c65 | 351 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 352 | |
1b7b9c65 | 353 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
354 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
355 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
356 | break; |
357 | } | |
358 | case 2: | |
359 | { | |
360 | void (*fptr)(void *__data, | |
fc4f7161 | 361 | long ret, |
5b7ac358 | 362 | unsigned long arg0, |
3b82c4e1 | 363 | unsigned long arg1) = func; |
1b7b9c65 | 364 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 365 | |
1b7b9c65 | 366 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
367 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
368 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
369 | break; |
370 | } | |
371 | case 3: | |
372 | { | |
373 | void (*fptr)(void *__data, | |
fc4f7161 | 374 | long ret, |
5b7ac358 MD |
375 | unsigned long arg0, |
376 | unsigned long arg1, | |
3b82c4e1 | 377 | unsigned long arg2) = func; |
1b7b9c65 | 378 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 379 | |
1b7b9c65 | 380 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
381 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
382 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
383 | break; |
384 | } | |
385 | case 4: | |
386 | { | |
387 | void (*fptr)(void *__data, | |
fc4f7161 | 388 | long ret, |
5b7ac358 MD |
389 | unsigned long arg0, |
390 | unsigned long arg1, | |
391 | unsigned long arg2, | |
3b82c4e1 | 392 | unsigned long arg3) = func; |
1b7b9c65 | 393 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 394 | |
1b7b9c65 | 395 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
396 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
397 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
398 | break; |
399 | } | |
400 | case 5: | |
401 | { | |
402 | void (*fptr)(void *__data, | |
fc4f7161 | 403 | long ret, |
5b7ac358 MD |
404 | unsigned long arg0, |
405 | unsigned long arg1, | |
406 | unsigned long arg2, | |
407 | unsigned long arg3, | |
3b82c4e1 | 408 | unsigned long arg4) = func; |
1b7b9c65 | 409 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 410 | |
1b7b9c65 | 411 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
412 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
413 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
414 | break; |
415 | } | |
416 | case 6: | |
417 | { | |
418 | void (*fptr)(void *__data, | |
fc4f7161 | 419 | long ret, |
5b7ac358 MD |
420 | unsigned long arg0, |
421 | unsigned long arg1, | |
422 | unsigned long arg2, | |
423 | unsigned long arg3, | |
424 | unsigned long arg4, | |
3b82c4e1 | 425 | unsigned long arg5) = func; |
1b7b9c65 | 426 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 427 | |
1b7b9c65 | 428 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
429 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
430 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 431 | args[3], args[4], args[5]); |
5b7ac358 MD |
432 | break; |
433 | } | |
434 | default: | |
435 | break; | |
436 | } | |
437 | } | |
438 | ||
3b82c4e1 MD |
439 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
440 | { | |
0bb716a8 | 441 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
442 | struct hlist_head *action_list, *unknown_action_list; |
443 | const struct trace_syscall_entry *table, *entry; | |
444 | size_t table_len; | |
445 | long id; | |
446 | ||
447 | id = syscall_get_nr(current, regs); | |
448 | ||
449 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 450 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
451 | |
452 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 453 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
454 | /* System call filtered out. */ |
455 | return; | |
456 | } | |
ebcc64cd FD |
457 | table = compat_sc_exit_table.table; |
458 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 459 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 460 | } else { |
0bb716a8 | 461 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
462 | |
463 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 464 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
465 | /* System call filtered out. */ |
466 | return; | |
467 | } | |
ebcc64cd FD |
468 | table = sc_exit_table.table; |
469 | table_len = sc_exit_table.len; | |
0bb716a8 | 470 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
471 | } |
472 | if (unlikely(id < 0 || id >= table_len)) { | |
473 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
474 | return; | |
475 | } | |
476 | ||
477 | entry = &table[id]; | |
478 | if (!entry->event_func) { | |
479 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
480 | return; | |
481 | } | |
482 | ||
483 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 484 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 485 | } else { |
0bb716a8 | 486 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
487 | } |
488 | if (unlikely(hlist_empty(action_list))) | |
489 | return; | |
490 | ||
e2d5dbc7 | 491 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
492 | regs, ret); |
493 | } | |
494 | ||
0bb716a8 MD |
495 | static |
496 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 497 | { |
0bb716a8 MD |
498 | switch (event_enabler->enabler_type) { |
499 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
500 | { | |
1ae083ba MD |
501 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
502 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 503 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 504 | } |
0bb716a8 MD |
505 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
506 | { | |
507 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
508 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
509 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 510 | } |
0bb716a8 MD |
511 | default: |
512 | return NULL; | |
8a8ac9a8 | 513 | } |
0bb716a8 | 514 | } |
8a8ac9a8 | 515 | |
0bb716a8 MD |
516 | static |
517 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
518 | { | |
519 | switch (event->type) { | |
520 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
521 | { | |
522 | struct lttng_kernel_event_recorder *event_recorder = | |
523 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
524 | return &event_recorder->chan->priv->parent.syscall_table; | |
525 | } | |
526 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
527 | { | |
528 | struct lttng_kernel_event_notifier *event_notifier = | |
529 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
530 | return &event_notifier->priv->group->syscall_table; | |
531 | } | |
532 | default: | |
533 | return NULL; | |
8a8ac9a8 | 534 | } |
8a8ac9a8 | 535 | } |
0bb716a8 | 536 | |
5408b6d6 MD |
537 | static |
538 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
99903379 | 539 | const struct lttng_kernel_event_desc *desc, enum sc_type type, unsigned int syscall_nr) |
5408b6d6 MD |
540 | { |
541 | struct lttng_kernel_event_common *event; | |
542 | ||
543 | switch (syscall_event_enabler->enabler_type) { | |
544 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
545 | { | |
546 | struct lttng_event_recorder_enabler *syscall_event_recorder_enabler = | |
547 | container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
548 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
549 | struct lttng_kernel_abi_event ev; | |
550 | ||
551 | /* We need to create an event for this syscall/enabler. */ | |
552 | memset(&ev, 0, sizeof(ev)); | |
553 | switch (type) { | |
554 | case SC_TYPE_ENTRY: | |
555 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
556 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
557 | break; | |
558 | case SC_TYPE_EXIT: | |
559 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
560 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
561 | break; | |
562 | case SC_TYPE_COMPAT_ENTRY: | |
563 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
564 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
565 | break; | |
566 | case SC_TYPE_COMPAT_EXIT: | |
567 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
568 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
569 | break; | |
570 | } | |
571 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); | |
572 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
573 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
574 | event_recorder_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, | |
575 | syscall_event_recorder_enabler->chan); | |
576 | WARN_ON_ONCE(!event_recorder_enabler); | |
577 | if (!event_recorder_enabler) | |
578 | return; | |
579 | event = _lttng_kernel_event_create(&event_recorder_enabler->parent, desc); | |
c3fb484e | 580 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 581 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
c3fb484e | 582 | if (IS_ERR(event)) { |
5408b6d6 MD |
583 | printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name); |
584 | return; | |
585 | } | |
9cd106a6 | 586 | event->priv->u.syscall.syscall_id = syscall_nr; |
5408b6d6 MD |
587 | break; |
588 | } | |
589 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
590 | { | |
591 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
592 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
593 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
594 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
595 | uint64_t user_token = syscall_event_enabler->user_token; | |
596 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
597 | ||
598 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
599 | switch (type) { | |
600 | case SC_TYPE_ENTRY: | |
601 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
602 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
603 | break; | |
604 | case SC_TYPE_EXIT: | |
605 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
606 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
607 | break; | |
608 | case SC_TYPE_COMPAT_ENTRY: | |
609 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
610 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
611 | break; | |
612 | case SC_TYPE_COMPAT_EXIT: | |
613 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
614 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
615 | break; | |
616 | } | |
617 | strncat(event_notifier_param.event.name, desc->event_name, | |
618 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
619 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
620 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
621 | event_notifier_param.event.token = user_token; | |
622 | event_notifier_param.error_counter_index = error_counter_index; | |
623 | ||
624 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
625 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
626 | WARN_ON_ONCE(!event_notifier_enabler); | |
627 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); | |
c3fb484e | 628 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 629 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 630 | if (IS_ERR(event)) { |
5408b6d6 MD |
631 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
632 | return; | |
633 | } | |
634 | event->priv->u.syscall.syscall_id = syscall_nr; | |
635 | break; | |
636 | } | |
637 | default: | |
638 | break; | |
639 | } | |
640 | } | |
641 | ||
49c50022 | 642 | static |
67233a18 MD |
643 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
644 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 645 | { |
063f0825 MD |
646 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common); |
647 | const struct lttng_kernel_event_desc *desc; | |
259b6cb3 | 648 | unsigned int i; |
49c50022 | 649 | |
1d303f69 MD |
650 | #ifndef CONFIG_COMPAT |
651 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 652 | return; |
1d303f69 | 653 | #endif |
67233a18 | 654 | /* iterate over all syscall and create event that match */ |
49c50022 | 655 | for (i = 0; i < table_len; i++) { |
19bef247 | 656 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 657 | struct hlist_head *head; |
6768203a | 658 | bool found = false; |
49c50022 | 659 | |
063f0825 | 660 | desc = table[i].desc; |
49c50022 MD |
661 | if (!desc) { |
662 | /* Unknown syscall */ | |
663 | continue; | |
664 | } | |
063f0825 MD |
665 | |
666 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 667 | continue; |
063f0825 | 668 | |
49c50022 | 669 | /* |
3b82c4e1 | 670 | * Check if already created. |
49c50022 | 671 | */ |
0def9170 | 672 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 673 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
6768203a MD |
674 | if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) { |
675 | found = true; | |
676 | break; | |
677 | } | |
3b82c4e1 MD |
678 | } |
679 | if (found) | |
49c50022 | 680 | continue; |
3b82c4e1 | 681 | |
99903379 | 682 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, type, i); |
49c50022 | 683 | } |
49c50022 MD |
684 | } |
685 | ||
552f7c79 MD |
686 | static |
687 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
688 | { | |
689 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
690 | return false; | |
691 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
692 | return false; | |
693 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
694 | return false; | |
695 | if (strcmp(event_enabler->event_param.name, "*")) | |
696 | return false; | |
697 | return true; | |
698 | } | |
699 | ||
9f6f4507 MD |
700 | static |
701 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
702 | { | |
9f6f4507 MD |
703 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
704 | struct lttng_kernel_event_common_private *event_priv; | |
705 | const struct lttng_kernel_event_desc *desc; | |
9f6f4507 MD |
706 | bool found = false; |
707 | struct hlist_head *head; | |
708 | ||
1d303f69 MD |
709 | #ifndef CONFIG_COMPAT |
710 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 711 | return; |
1d303f69 | 712 | #endif |
552f7c79 MD |
713 | /* |
714 | * Considering that currently system calls can only be enabled on a per | |
715 | * name basis (or wildcard based on a name), unknown syscall events are | |
716 | * only used when matching *all* system calls, because this is the only | |
717 | * case which can be associated with an unknown system call. | |
718 | * | |
719 | * When enabling system call on a per system call number basis will be | |
720 | * supported, this will need to be revisited. | |
721 | */ | |
722 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
723 | return; | |
724 | ||
9f6f4507 MD |
725 | switch (type) { |
726 | case SC_TYPE_ENTRY: | |
727 | desc = &__event_desc___syscall_entry_unknown; | |
9f6f4507 MD |
728 | break; |
729 | case SC_TYPE_EXIT: | |
730 | desc = &__event_desc___syscall_exit_unknown; | |
9f6f4507 MD |
731 | break; |
732 | case SC_TYPE_COMPAT_ENTRY: | |
733 | desc = &__event_desc___compat_syscall_entry_unknown; | |
9f6f4507 MD |
734 | break; |
735 | case SC_TYPE_COMPAT_EXIT: | |
736 | desc = &__event_desc___compat_syscall_exit_unknown; | |
9f6f4507 MD |
737 | break; |
738 | default: | |
739 | WARN_ON_ONCE(1); | |
740 | } | |
741 | ||
742 | /* | |
743 | * Check if already created. | |
744 | */ | |
745 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); | |
746 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { | |
6768203a | 747 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
9f6f4507 | 748 | found = true; |
6768203a MD |
749 | break; |
750 | } | |
9f6f4507 MD |
751 | } |
752 | if (!found) | |
99903379 | 753 | lttng_syscall_event_enabler_create_event(event_enabler, desc, type, -1U); |
9f6f4507 MD |
754 | } |
755 | ||
d26015f6 | 756 | static |
15a00134 | 757 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 758 | { |
15a00134 | 759 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 760 | |
15a00134 MD |
761 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
762 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
763 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
764 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
765 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
766 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
767 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
768 | } | |
1ab4126a | 769 | |
15a00134 MD |
770 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
771 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
772 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
773 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
774 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
775 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
776 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
777 | } | |
259b6cb3 MD |
778 | } |
779 | ||
780 | /* | |
8a8ac9a8 FD |
781 | * Should be called with sessions lock held. |
782 | */ | |
b2f63bde | 783 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 784 | { |
d26015f6 MD |
785 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
786 | int ret; | |
8a8ac9a8 | 787 | |
0bb716a8 | 788 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 789 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
790 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
791 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 792 | return -ENOMEM; |
8a8ac9a8 | 793 | } |
0bb716a8 | 794 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
795 | /* create syscall table mapping syscall to events */ |
796 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 797 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 798 | return -ENOMEM; |
8a8ac9a8 FD |
799 | } |
800 | ||
801 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 802 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 803 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
804 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
805 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 806 | return -ENOMEM; |
8a8ac9a8 FD |
807 | } |
808 | ||
0bb716a8 | 809 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
810 | /* create syscall table mapping compat syscall to events */ |
811 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 812 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 813 | return -ENOMEM; |
8a8ac9a8 FD |
814 | } |
815 | #endif | |
0bb716a8 MD |
816 | if (!syscall_table->sc_filter) { |
817 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 818 | GFP_KERNEL); |
0bb716a8 | 819 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
820 | return -ENOMEM; |
821 | } | |
822 | ||
0bb716a8 | 823 | if (!syscall_table->sys_enter_registered) { |
8a8ac9a8 | 824 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 825 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
826 | if (ret) |
827 | return ret; | |
0bb716a8 | 828 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 829 | } |
0bb716a8 | 830 | if (!syscall_table->sys_exit_registered) { |
8a8ac9a8 | 831 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 832 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 FD |
833 | if (ret) { |
834 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 835 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
836 | return ret; |
837 | } | |
0bb716a8 | 838 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 839 | } |
0fab709d | 840 | |
86e12a51 MD |
841 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
842 | ||
fad51c94 | 843 | return 0; |
8a8ac9a8 FD |
844 | } |
845 | ||
6053e75e | 846 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
847 | { |
848 | int ret; | |
849 | ||
0bb716a8 | 850 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 851 | return 0; |
0bb716a8 | 852 | if (syscall_table->sys_enter_registered) { |
2d9cd7f3 | 853 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 854 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
855 | if (ret) |
856 | return ret; | |
0bb716a8 | 857 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 858 | } |
0bb716a8 | 859 | if (syscall_table->sys_exit_registered) { |
2d9cd7f3 | 860 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 861 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
862 | if (ret) |
863 | return ret; | |
0bb716a8 | 864 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 865 | } |
badfe9f5 MD |
866 | return 0; |
867 | } | |
868 | ||
6053e75e | 869 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 870 | { |
0bb716a8 MD |
871 | kfree(syscall_table->syscall_dispatch); |
872 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 873 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
874 | kfree(syscall_table->compat_syscall_dispatch); |
875 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 876 | #endif |
0bb716a8 | 877 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
878 | return 0; |
879 | } | |
880 | ||
12e579db MD |
881 | static |
882 | uint32_t get_sc_tables_len(void) | |
883 | { | |
ebcc64cd | 884 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
885 | } |
886 | ||
badfe9f5 | 887 | static |
ade8a729 FD |
888 | const char *get_syscall_name(const char *desc_name, |
889 | enum lttng_syscall_abi abi, | |
890 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 891 | { |
badfe9f5 | 892 | size_t prefix_len = 0; |
80f87dd2 | 893 | |
80f87dd2 | 894 | |
ade8a729 | 895 | switch (entryexit) { |
badfe9f5 | 896 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 897 | switch (abi) { |
badfe9f5 MD |
898 | case LTTNG_SYSCALL_ABI_NATIVE: |
899 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
900 | break; | |
901 | case LTTNG_SYSCALL_ABI_COMPAT: | |
902 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
903 | break; | |
80f87dd2 | 904 | } |
badfe9f5 MD |
905 | break; |
906 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 907 | switch (abi) { |
badfe9f5 MD |
908 | case LTTNG_SYSCALL_ABI_NATIVE: |
909 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
910 | break; | |
911 | case LTTNG_SYSCALL_ABI_COMPAT: | |
912 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
913 | break; | |
80f87dd2 | 914 | } |
badfe9f5 | 915 | break; |
80f87dd2 | 916 | } |
badfe9f5 | 917 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 918 | return desc_name + prefix_len; |
badfe9f5 MD |
919 | } |
920 | ||
ade8a729 FD |
921 | static |
922 | int lttng_syscall_filter_enable( | |
923 | struct lttng_syscall_filter *filter, | |
924 | const char *desc_name, enum lttng_syscall_abi abi, | |
99903379 MD |
925 | enum lttng_syscall_entryexit entryexit, |
926 | unsigned int syscall_id) | |
badfe9f5 | 927 | { |
badfe9f5 MD |
928 | const char *syscall_name; |
929 | unsigned long *bitmap; | |
7f52f0d4 | 930 | u32 *refcount_map; |
badfe9f5 | 931 | |
ade8a729 | 932 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 933 | |
ade8a729 | 934 | switch (entryexit) { |
badfe9f5 | 935 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 936 | switch (abi) { |
badfe9f5 MD |
937 | case LTTNG_SYSCALL_ABI_NATIVE: |
938 | bitmap = filter->sc_entry; | |
7f52f0d4 | 939 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
940 | break; |
941 | case LTTNG_SYSCALL_ABI_COMPAT: | |
942 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 943 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 944 | break; |
6d9694d8 MD |
945 | default: |
946 | return -EINVAL; | |
80f87dd2 | 947 | } |
badfe9f5 MD |
948 | break; |
949 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 950 | switch (abi) { |
badfe9f5 MD |
951 | case LTTNG_SYSCALL_ABI_NATIVE: |
952 | bitmap = filter->sc_exit; | |
7f52f0d4 | 953 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
954 | break; |
955 | case LTTNG_SYSCALL_ABI_COMPAT: | |
956 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 957 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 958 | break; |
6d9694d8 MD |
959 | default: |
960 | return -EINVAL; | |
80f87dd2 | 961 | } |
badfe9f5 MD |
962 | break; |
963 | default: | |
964 | return -EINVAL; | |
80f87dd2 | 965 | } |
99903379 | 966 | if (refcount_map[syscall_id] == U32_MAX) |
7f52f0d4 | 967 | return -EOVERFLOW; |
99903379 MD |
968 | if (refcount_map[syscall_id]++ == 0) |
969 | bitmap_set(bitmap, syscall_id, 1); | |
80f87dd2 | 970 | return 0; |
80f87dd2 MD |
971 | } |
972 | ||
9b2f1c54 | 973 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 974 | { |
9b2f1c54 | 975 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
976 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
977 | struct hlist_head *dispatch_list; | |
ca62543e | 978 | int ret = 0; |
8a8ac9a8 | 979 | |
9b2f1c54 | 980 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 981 | |
99903379 MD |
982 | /* Unknown syscall */ |
983 | if (syscall_id == -1U) { | |
984 | switch (event->priv->u.syscall.entryexit) { | |
985 | case LTTNG_SYSCALL_ENTRY: | |
986 | switch (event->priv->u.syscall.abi) { | |
987 | case LTTNG_SYSCALL_ABI_NATIVE: | |
988 | dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
989 | break; | |
990 | case LTTNG_SYSCALL_ABI_COMPAT: | |
991 | dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
992 | break; | |
993 | default: | |
994 | ret = -EINVAL; | |
995 | goto end; | |
996 | } | |
9cd106a6 | 997 | break; |
99903379 MD |
998 | case LTTNG_SYSCALL_EXIT: |
999 | switch (event->priv->u.syscall.abi) { | |
1000 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1001 | dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
1002 | break; | |
1003 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1004 | dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
1005 | break; | |
1006 | default: | |
1007 | ret = -EINVAL; | |
1008 | goto end; | |
1009 | } | |
9cd106a6 MD |
1010 | break; |
1011 | default: | |
1012 | ret = -EINVAL; | |
1013 | goto end; | |
1014 | } | |
99903379 MD |
1015 | } else { |
1016 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, | |
1017 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1018 | event->priv->u.syscall.entryexit, syscall_id); | |
1019 | if (ret) | |
1020 | return ret; | |
1021 | ||
1022 | switch (event->priv->u.syscall.entryexit) { | |
1023 | case LTTNG_SYSCALL_ENTRY: | |
1024 | switch (event->priv->u.syscall.abi) { | |
1025 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1026 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1027 | break; | |
1028 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1029 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1030 | break; | |
1031 | default: | |
1032 | ret = -EINVAL; | |
1033 | goto end; | |
1034 | } | |
8a8ac9a8 | 1035 | break; |
99903379 MD |
1036 | case LTTNG_SYSCALL_EXIT: |
1037 | switch (event->priv->u.syscall.abi) { | |
1038 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1039 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1040 | break; | |
1041 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1042 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1043 | break; | |
1044 | default: | |
1045 | ret = -EINVAL; | |
1046 | goto end; | |
1047 | } | |
8a8ac9a8 | 1048 | break; |
6866b1c7 MJ |
1049 | default: |
1050 | ret = -EINVAL; | |
1051 | goto end; | |
8a8ac9a8 | 1052 | } |
8a8ac9a8 | 1053 | } |
9cd106a6 MD |
1054 | |
1055 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1056 | end: |
9b2f1c54 | 1057 | return ret; |
ade8a729 FD |
1058 | } |
1059 | ||
1060 | static | |
f2db8be3 | 1061 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 | 1062 | const char *desc_name, enum lttng_syscall_abi abi, |
99903379 MD |
1063 | enum lttng_syscall_entryexit entryexit, |
1064 | unsigned int syscall_id) | |
ade8a729 | 1065 | { |
badfe9f5 MD |
1066 | const char *syscall_name; |
1067 | unsigned long *bitmap; | |
7f52f0d4 | 1068 | u32 *refcount_map; |
80f87dd2 | 1069 | |
ade8a729 | 1070 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1071 | |
ade8a729 | 1072 | switch (entryexit) { |
badfe9f5 | 1073 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1074 | switch (abi) { |
badfe9f5 MD |
1075 | case LTTNG_SYSCALL_ABI_NATIVE: |
1076 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1077 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1078 | break; |
1079 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1080 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1081 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1082 | break; |
6d9694d8 MD |
1083 | default: |
1084 | return -EINVAL; | |
80f87dd2 | 1085 | } |
badfe9f5 MD |
1086 | break; |
1087 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1088 | switch (abi) { |
badfe9f5 MD |
1089 | case LTTNG_SYSCALL_ABI_NATIVE: |
1090 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1091 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1092 | break; |
1093 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1094 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1095 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1096 | break; |
6d9694d8 MD |
1097 | default: |
1098 | return -EINVAL; | |
80f87dd2 | 1099 | } |
badfe9f5 MD |
1100 | break; |
1101 | default: | |
1102 | return -EINVAL; | |
80f87dd2 | 1103 | } |
99903379 | 1104 | if (refcount_map[syscall_id] == 0) |
7f52f0d4 | 1105 | return -ENOENT; |
99903379 MD |
1106 | if (--refcount_map[syscall_id] == 0) |
1107 | bitmap_clear(bitmap, syscall_id, 1); | |
badfe9f5 | 1108 | return 0; |
259b6cb3 | 1109 | } |
2d2464bd | 1110 | |
9b2f1c54 | 1111 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1112 | { |
9b2f1c54 | 1113 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
7f52f0d4 | 1114 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
8a8ac9a8 FD |
1115 | int ret; |
1116 | ||
99903379 MD |
1117 | /* Except for unknown syscall */ |
1118 | if (syscall_id != -1U) { | |
1119 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, | |
1120 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1121 | event->priv->u.syscall.entryexit, syscall_id); | |
1122 | if (ret) | |
1123 | return ret; | |
1124 | } | |
9cd106a6 | 1125 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1126 | return 0; |
1127 | } | |
1128 | ||
9cb5be7e MD |
1129 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1130 | { | |
1131 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1132 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1133 | int enabled = event_enabler->enabled; | |
1134 | ||
552f7c79 | 1135 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1136 | return; |
9cb5be7e MD |
1137 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1138 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1139 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1140 | ||
1141 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1142 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1143 | } | |
1144 | ||
2d2464bd MD |
1145 | static |
1146 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1147 | { | |
1148 | const struct trace_syscall_entry *entry; | |
1149 | int iter = 0; | |
1150 | ||
ebcc64cd FD |
1151 | for (entry = sc_table.table; |
1152 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1153 | entry++) { |
1154 | if (iter++ >= *pos) | |
1155 | return entry; | |
1156 | } | |
ebcc64cd FD |
1157 | for (entry = compat_sc_table.table; |
1158 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1159 | entry++) { |
1160 | if (iter++ >= *pos) | |
1161 | return entry; | |
1162 | } | |
1163 | /* End of list */ | |
1164 | return NULL; | |
1165 | } | |
1166 | ||
1167 | static | |
1168 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1169 | { | |
1170 | return (void *) syscall_list_get_entry(pos); | |
1171 | } | |
1172 | ||
1173 | static | |
1174 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1175 | { | |
1176 | (*ppos)++; | |
1177 | return (void *) syscall_list_get_entry(ppos); | |
1178 | } | |
1179 | ||
1180 | static | |
1181 | void syscall_list_stop(struct seq_file *m, void *p) | |
1182 | { | |
1183 | } | |
1184 | ||
12e579db MD |
1185 | static |
1186 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1187 | const struct trace_syscall_entry **table, | |
1188 | unsigned int *bitness) | |
1189 | { | |
ebcc64cd | 1190 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1191 | if (bitness) |
1192 | *bitness = BITS_PER_LONG; | |
1193 | if (table) | |
ebcc64cd | 1194 | *table = sc_table.table; |
12e579db MD |
1195 | return 0; |
1196 | } | |
ebcc64cd FD |
1197 | if (!(entry >= compat_sc_table.table |
1198 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1199 | return -EINVAL; |
1200 | } | |
1201 | if (bitness) | |
1202 | *bitness = 32; | |
1203 | if (table) | |
ebcc64cd | 1204 | *table = compat_sc_table.table; |
12e579db MD |
1205 | return 0; |
1206 | } | |
1207 | ||
2d2464bd MD |
1208 | static |
1209 | int syscall_list_show(struct seq_file *m, void *p) | |
1210 | { | |
1211 | const struct trace_syscall_entry *table, *entry = p; | |
1212 | unsigned int bitness; | |
d4291869 | 1213 | unsigned long index; |
12e579db | 1214 | int ret; |
d4291869 | 1215 | const char *name; |
2d2464bd | 1216 | |
12e579db MD |
1217 | ret = get_sc_table(entry, &table, &bitness); |
1218 | if (ret) | |
1219 | return ret; | |
f4855b46 MD |
1220 | if (!entry->desc) |
1221 | return 0; | |
ebcc64cd | 1222 | if (table == sc_table.table) { |
d4291869 | 1223 | index = entry - table; |
437d5aa5 | 1224 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1225 | } else { |
ebcc64cd | 1226 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1227 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1228 | } |
12e579db | 1229 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1230 | index, name, bitness); |
2d2464bd MD |
1231 | return 0; |
1232 | } | |
1233 | ||
1234 | static | |
1235 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1236 | .start = syscall_list_start, | |
1237 | .next = syscall_list_next, | |
1238 | .stop = syscall_list_stop, | |
1239 | .show = syscall_list_show, | |
1240 | }; | |
1241 | ||
1242 | static | |
1243 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1244 | { | |
1245 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1246 | } | |
1247 | ||
1248 | const struct file_operations lttng_syscall_list_fops = { | |
1249 | .owner = THIS_MODULE, | |
1250 | .open = lttng_syscall_list_open, | |
1251 | .read = seq_read, | |
1252 | .llseek = seq_lseek, | |
1253 | .release = seq_release, | |
1254 | }; | |
12e579db | 1255 | |
badfe9f5 MD |
1256 | /* |
1257 | * A syscall is enabled if it is traced for either entry or exit. | |
1258 | */ | |
c970b655 | 1259 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1260 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1261 | { |
1262 | uint32_t len, sc_tables_len, bitmask_len; | |
1263 | int ret = 0, bit; | |
1264 | char *tmp_mask; | |
1265 | struct lttng_syscall_filter *filter; | |
1266 | ||
1267 | ret = get_user(len, &usyscall_mask->len); | |
1268 | if (ret) | |
1269 | return ret; | |
1270 | sc_tables_len = get_sc_tables_len(); | |
1271 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1272 | if (len < sc_tables_len) { | |
1273 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1274 | } | |
1275 | /* Array is large enough, we can copy array to user-space. */ | |
1276 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1277 | if (!tmp_mask) | |
1278 | return -ENOMEM; | |
0bb716a8 | 1279 | filter = syscall_table->sc_filter; |
12e579db | 1280 | |
ebcc64cd | 1281 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1282 | char state; |
2f25059d | 1283 | |
0bb716a8 MD |
1284 | if (syscall_table->syscall_dispatch) { |
1285 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1286 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1287 | state = test_bit(bit, filter->sc_entry) |
1288 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1289 | else |
1290 | state = 1; | |
1291 | } else { | |
1292 | state = 0; | |
1293 | } | |
1294 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1295 | } |
1296 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1297 | char state; |
2f25059d | 1298 | |
0bb716a8 MD |
1299 | if (syscall_table->compat_syscall_dispatch) { |
1300 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1301 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1302 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1303 | filter->sc_compat_entry) |
ebcc64cd | 1304 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1305 | filter->sc_compat_exit); |
2f25059d MD |
1306 | else |
1307 | state = 1; | |
1308 | } else { | |
1309 | state = 0; | |
1310 | } | |
1311 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1312 | } |
1313 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1314 | ret = -EFAULT; | |
1315 | kfree(tmp_mask); | |
1316 | return ret; | |
1317 | } | |
082d4946 MD |
1318 | |
1319 | int lttng_abi_syscall_list(void) | |
1320 | { | |
1321 | struct file *syscall_list_file; | |
1322 | int file_fd, ret; | |
1323 | ||
4ac10b76 | 1324 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1325 | if (file_fd < 0) { |
1326 | ret = file_fd; | |
1327 | goto fd_error; | |
1328 | } | |
1329 | ||
1330 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1331 | <tng_syscall_list_fops, | |
1332 | NULL, O_RDWR); | |
1333 | if (IS_ERR(syscall_list_file)) { | |
1334 | ret = PTR_ERR(syscall_list_file); | |
1335 | goto file_error; | |
1336 | } | |
1337 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1338 | if (ret < 0) | |
1339 | goto open_error; | |
1340 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1341 | return file_fd; |
1342 | ||
1343 | open_error: | |
1344 | fput(syscall_list_file); | |
1345 | file_error: | |
1346 | put_unused_fd(file_fd); | |
1347 | fd_error: | |
1348 | return ret; | |
1349 | } |