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 | 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> |
45bf1e52 | 34 | #include <lttng/kernel-version.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 | |
45bf1e52 MD |
46 | # define in_compat_syscall() is_compat_task() |
47 | #endif | |
48 | ||
49 | /* in_x32_syscall appears in kernel 4.7. */ | |
50 | #if (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(4,7,0)) | |
51 | # ifdef CONFIG_X86_X32_ABI | |
52 | # define in_x32_syscall() is_x32_task() | |
53 | # endif | |
1aa3298b MD |
54 | #endif |
55 | ||
5b7ac358 MD |
56 | enum sc_type { |
57 | SC_TYPE_ENTRY, | |
58 | SC_TYPE_EXIT, | |
59 | SC_TYPE_COMPAT_ENTRY, | |
60 | SC_TYPE_COMPAT_EXIT, | |
61 | }; | |
62 | ||
d4291869 MD |
63 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
64 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
65 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
66 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
67 | ||
68 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
69 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
70 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
71 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 72 | |
2d6d88c6 | 73 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
2d6d88c6 | 74 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 75 | |
80f87dd2 MD |
76 | #ifdef IA32_NR_syscalls |
77 | #define NR_compat_syscalls IA32_NR_syscalls | |
78 | #else | |
79 | #define NR_compat_syscalls NR_syscalls | |
80 | #endif | |
81 | ||
259b6cb3 MD |
82 | /* |
83 | * Create LTTng tracepoint probes. | |
84 | */ | |
85 | #define LTTNG_PACKAGE_BUILD | |
86 | #define CREATE_TRACE_POINTS | |
2655f9ad | 87 | #define TP_MODULE_NOINIT |
c075712b | 88 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 89 | |
a93244f8 MD |
90 | #define PARAMS(args...) args |
91 | ||
5b7ac358 | 92 | /* Handle unknown syscalls */ |
72a52753 | 93 | #undef TRACE_SYSTEM |
5b7ac358 | 94 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 95 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
96 | #undef TRACE_SYSTEM |
97 | ||
5b7ac358 | 98 | #undef TP_PROBE_CB |
fc4f7161 | 99 | |
e42c4f49 FD |
100 | extern const struct trace_syscall_table sc_table; |
101 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 102 | |
2d6d88c6 | 103 | /* Event syscall exit table */ |
e42c4f49 FD |
104 | extern const struct trace_syscall_table sc_exit_table; |
105 | extern const struct trace_syscall_table compat_sc_exit_table; | |
ebcc64cd FD |
106 | |
107 | ||
fc4f7161 MD |
108 | #undef SC_EXIT |
109 | ||
a93244f8 | 110 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 111 | |
80f87dd2 | 112 | struct lttng_syscall_filter { |
badfe9f5 MD |
113 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
114 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
115 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
116 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
7f52f0d4 MD |
117 | |
118 | /* | |
119 | * Reference counters keeping track of number of events enabled | |
120 | * for each bit. | |
121 | */ | |
122 | u32 sc_entry_refcount_map[NR_syscalls]; | |
123 | u32 sc_exit_refcount_map[NR_syscalls]; | |
124 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
125 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
126 | }; |
127 | ||
3b82c4e1 | 128 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 129 | struct pt_regs *regs, long id) |
f405cfce | 130 | { |
1b7b9c65 | 131 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 132 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 133 | |
1b7b9c65 | 134 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 135 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 136 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 137 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 138 | else |
e2d5dbc7 | 139 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
140 | } |
141 | } | |
142 | ||
63aa9160 | 143 | static __always_inline |
e2d5dbc7 | 144 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 145 | void *func, unsigned int nrargs, |
63aa9160 | 146 | struct pt_regs *regs) |
259b6cb3 | 147 | { |
a67ba386 | 148 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 149 | |
63aa9160 | 150 | switch (nrargs) { |
259b6cb3 MD |
151 | case 0: |
152 | { | |
63aa9160 | 153 | void (*fptr)(void *__data) = func; |
259b6cb3 | 154 | |
e2d5dbc7 MD |
155 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
156 | fptr(event_priv->pub); | |
259b6cb3 MD |
157 | break; |
158 | } | |
159 | case 1: | |
160 | { | |
63aa9160 | 161 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 162 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 163 | |
1b7b9c65 | 164 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
165 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
166 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
167 | break; |
168 | } | |
169 | case 2: | |
170 | { | |
171 | void (*fptr)(void *__data, | |
172 | unsigned long arg0, | |
63aa9160 | 173 | unsigned long arg1) = func; |
1b7b9c65 | 174 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 175 | |
1b7b9c65 | 176 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
177 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
178 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
179 | break; |
180 | } | |
181 | case 3: | |
182 | { | |
183 | void (*fptr)(void *__data, | |
184 | unsigned long arg0, | |
185 | unsigned long arg1, | |
63aa9160 | 186 | unsigned long arg2) = func; |
1b7b9c65 | 187 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 188 | |
1b7b9c65 | 189 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
190 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
191 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
192 | break; |
193 | } | |
194 | case 4: | |
195 | { | |
196 | void (*fptr)(void *__data, | |
197 | unsigned long arg0, | |
198 | unsigned long arg1, | |
199 | unsigned long arg2, | |
63aa9160 | 200 | unsigned long arg3) = func; |
1b7b9c65 | 201 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 202 | |
1b7b9c65 | 203 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
204 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
205 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
206 | break; |
207 | } | |
208 | case 5: | |
209 | { | |
210 | void (*fptr)(void *__data, | |
211 | unsigned long arg0, | |
212 | unsigned long arg1, | |
213 | unsigned long arg2, | |
214 | unsigned long arg3, | |
63aa9160 | 215 | unsigned long arg4) = func; |
1b7b9c65 | 216 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 217 | |
1b7b9c65 | 218 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
219 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
220 | fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]); | |
259b6cb3 MD |
221 | break; |
222 | } | |
223 | case 6: | |
224 | { | |
225 | void (*fptr)(void *__data, | |
226 | unsigned long arg0, | |
227 | unsigned long arg1, | |
228 | unsigned long arg2, | |
229 | unsigned long arg3, | |
230 | unsigned long arg4, | |
63aa9160 | 231 | unsigned long arg5) = func; |
1b7b9c65 | 232 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 233 | |
1b7b9c65 | 234 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
235 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
236 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 237 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
238 | break; |
239 | } | |
240 | default: | |
241 | break; | |
242 | } | |
243 | } | |
244 | ||
63aa9160 FD |
245 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
246 | { | |
0bb716a8 | 247 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 248 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
249 | const struct trace_syscall_entry *table, *entry; |
250 | size_t table_len; | |
251 | ||
5b5778b1 MD |
252 | #ifdef CONFIG_X86_X32_ABI |
253 | if (in_x32_syscall()) { | |
254 | /* x32 system calls are not supported. */ | |
255 | return; | |
256 | } | |
257 | #endif | |
63aa9160 | 258 | if (unlikely(in_compat_syscall())) { |
0bb716a8 | 259 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
260 | |
261 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 262 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
263 | /* System call filtered out. */ |
264 | return; | |
265 | } | |
ebcc64cd FD |
266 | table = compat_sc_table.table; |
267 | table_len = compat_sc_table.len; | |
0bb716a8 | 268 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 269 | } else { |
0bb716a8 | 270 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
271 | |
272 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 273 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
274 | /* System call filtered out. */ |
275 | return; | |
276 | } | |
ebcc64cd FD |
277 | table = sc_table.table; |
278 | table_len = sc_table.len; | |
0bb716a8 | 279 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
280 | } |
281 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 282 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
283 | return; |
284 | } | |
3b82c4e1 MD |
285 | |
286 | entry = &table[id]; | |
287 | if (!entry->event_func) { | |
288 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
289 | return; |
290 | } | |
3b82c4e1 MD |
291 | |
292 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 293 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 294 | } else { |
0bb716a8 | 295 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
296 | } |
297 | if (unlikely(hlist_empty(action_list))) | |
298 | return; | |
299 | ||
e2d5dbc7 | 300 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
301 | } |
302 | ||
3b82c4e1 | 303 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 304 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 305 | { |
1b7b9c65 | 306 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 307 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 308 | |
1b7b9c65 | 309 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 310 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 311 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 312 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
313 | args); |
314 | else | |
e2d5dbc7 | 315 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 316 | } |
5b7ac358 MD |
317 | } |
318 | ||
3b82c4e1 | 319 | static __always_inline |
e2d5dbc7 | 320 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
321 | void *func, unsigned int nrargs, |
322 | struct pt_regs *regs, long ret) | |
5b7ac358 | 323 | { |
a67ba386 | 324 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 325 | |
3b82c4e1 | 326 | switch (nrargs) { |
5b7ac358 MD |
327 | case 0: |
328 | { | |
3b82c4e1 | 329 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 330 | |
e2d5dbc7 MD |
331 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
332 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
333 | break; |
334 | } | |
335 | case 1: | |
336 | { | |
337 | void (*fptr)(void *__data, | |
fc4f7161 | 338 | long ret, |
3b82c4e1 | 339 | unsigned long arg0) = func; |
1b7b9c65 | 340 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 341 | |
1b7b9c65 | 342 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
343 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
344 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
345 | break; |
346 | } | |
347 | case 2: | |
348 | { | |
349 | void (*fptr)(void *__data, | |
fc4f7161 | 350 | long ret, |
5b7ac358 | 351 | unsigned long arg0, |
3b82c4e1 | 352 | unsigned long arg1) = func; |
1b7b9c65 | 353 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 354 | |
1b7b9c65 | 355 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
356 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
357 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
358 | break; |
359 | } | |
360 | case 3: | |
361 | { | |
362 | void (*fptr)(void *__data, | |
fc4f7161 | 363 | long ret, |
5b7ac358 MD |
364 | unsigned long arg0, |
365 | unsigned long arg1, | |
3b82c4e1 | 366 | unsigned long arg2) = func; |
1b7b9c65 | 367 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 368 | |
1b7b9c65 | 369 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
370 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
371 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
372 | break; |
373 | } | |
374 | case 4: | |
375 | { | |
376 | void (*fptr)(void *__data, | |
fc4f7161 | 377 | long ret, |
5b7ac358 MD |
378 | unsigned long arg0, |
379 | unsigned long arg1, | |
380 | unsigned long arg2, | |
3b82c4e1 | 381 | unsigned long arg3) = func; |
1b7b9c65 | 382 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 383 | |
1b7b9c65 | 384 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
385 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
386 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
387 | break; |
388 | } | |
389 | case 5: | |
390 | { | |
391 | void (*fptr)(void *__data, | |
fc4f7161 | 392 | long ret, |
5b7ac358 MD |
393 | unsigned long arg0, |
394 | unsigned long arg1, | |
395 | unsigned long arg2, | |
396 | unsigned long arg3, | |
3b82c4e1 | 397 | unsigned long arg4) = func; |
1b7b9c65 | 398 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 399 | |
1b7b9c65 | 400 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
401 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
402 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
403 | break; |
404 | } | |
405 | case 6: | |
406 | { | |
407 | void (*fptr)(void *__data, | |
fc4f7161 | 408 | long ret, |
5b7ac358 MD |
409 | unsigned long arg0, |
410 | unsigned long arg1, | |
411 | unsigned long arg2, | |
412 | unsigned long arg3, | |
413 | unsigned long arg4, | |
3b82c4e1 | 414 | unsigned long arg5) = func; |
1b7b9c65 | 415 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 416 | |
1b7b9c65 | 417 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
418 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
419 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 420 | args[3], args[4], args[5]); |
5b7ac358 MD |
421 | break; |
422 | } | |
423 | default: | |
424 | break; | |
425 | } | |
426 | } | |
427 | ||
3b82c4e1 MD |
428 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
429 | { | |
0bb716a8 | 430 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
431 | struct hlist_head *action_list, *unknown_action_list; |
432 | const struct trace_syscall_entry *table, *entry; | |
433 | size_t table_len; | |
434 | long id; | |
435 | ||
5b5778b1 MD |
436 | #ifdef CONFIG_X86_X32_ABI |
437 | if (in_x32_syscall()) { | |
438 | /* x32 system calls are not supported. */ | |
439 | return; | |
440 | } | |
441 | #endif | |
3b82c4e1 MD |
442 | id = syscall_get_nr(current, regs); |
443 | ||
444 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 445 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
446 | |
447 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 448 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
449 | /* System call filtered out. */ |
450 | return; | |
451 | } | |
ebcc64cd FD |
452 | table = compat_sc_exit_table.table; |
453 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 454 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 455 | } else { |
0bb716a8 | 456 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
457 | |
458 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 459 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
460 | /* System call filtered out. */ |
461 | return; | |
462 | } | |
ebcc64cd FD |
463 | table = sc_exit_table.table; |
464 | table_len = sc_exit_table.len; | |
0bb716a8 | 465 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
466 | } |
467 | if (unlikely(id < 0 || id >= table_len)) { | |
468 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
469 | return; | |
470 | } | |
471 | ||
472 | entry = &table[id]; | |
473 | if (!entry->event_func) { | |
474 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
475 | return; | |
476 | } | |
477 | ||
478 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 479 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 480 | } else { |
0bb716a8 | 481 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
482 | } |
483 | if (unlikely(hlist_empty(action_list))) | |
484 | return; | |
485 | ||
e2d5dbc7 | 486 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
487 | regs, ret); |
488 | } | |
489 | ||
0bb716a8 MD |
490 | static |
491 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 492 | { |
0bb716a8 MD |
493 | switch (event_enabler->enabler_type) { |
494 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
495 | { | |
1ae083ba MD |
496 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
497 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 498 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 499 | } |
0bb716a8 MD |
500 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
501 | { | |
502 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
503 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
504 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 505 | } |
0bb716a8 MD |
506 | default: |
507 | return NULL; | |
8a8ac9a8 | 508 | } |
0bb716a8 | 509 | } |
8a8ac9a8 | 510 | |
0bb716a8 MD |
511 | static |
512 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
513 | { | |
514 | switch (event->type) { | |
515 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
516 | { | |
517 | struct lttng_kernel_event_recorder *event_recorder = | |
518 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
519 | return &event_recorder->chan->priv->parent.syscall_table; | |
520 | } | |
521 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
522 | { | |
523 | struct lttng_kernel_event_notifier *event_notifier = | |
524 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
525 | return &event_notifier->priv->group->syscall_table; | |
526 | } | |
527 | default: | |
528 | return NULL; | |
8a8ac9a8 | 529 | } |
8a8ac9a8 | 530 | } |
0bb716a8 | 531 | |
5408b6d6 MD |
532 | static |
533 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
99903379 | 534 | const struct lttng_kernel_event_desc *desc, enum sc_type type, unsigned int syscall_nr) |
5408b6d6 MD |
535 | { |
536 | struct lttng_kernel_event_common *event; | |
537 | ||
538 | switch (syscall_event_enabler->enabler_type) { | |
539 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
540 | { | |
541 | struct lttng_event_recorder_enabler *syscall_event_recorder_enabler = | |
542 | container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); | |
543 | struct lttng_event_recorder_enabler *event_recorder_enabler; | |
544 | struct lttng_kernel_abi_event ev; | |
545 | ||
546 | /* We need to create an event for this syscall/enabler. */ | |
547 | memset(&ev, 0, sizeof(ev)); | |
548 | switch (type) { | |
549 | case SC_TYPE_ENTRY: | |
550 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
551 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
552 | break; | |
553 | case SC_TYPE_EXIT: | |
554 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
555 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
556 | break; | |
557 | case SC_TYPE_COMPAT_ENTRY: | |
558 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
559 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
560 | break; | |
561 | case SC_TYPE_COMPAT_EXIT: | |
562 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
563 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
564 | break; | |
565 | } | |
566 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); | |
567 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
568 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
569 | event_recorder_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, | |
570 | syscall_event_recorder_enabler->chan); | |
571 | WARN_ON_ONCE(!event_recorder_enabler); | |
572 | if (!event_recorder_enabler) | |
573 | return; | |
574 | event = _lttng_kernel_event_create(&event_recorder_enabler->parent, desc); | |
c3fb484e | 575 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 576 | lttng_event_enabler_destroy(&event_recorder_enabler->parent); |
c3fb484e | 577 | if (IS_ERR(event)) { |
5408b6d6 MD |
578 | printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name); |
579 | return; | |
580 | } | |
9cd106a6 | 581 | event->priv->u.syscall.syscall_id = syscall_nr; |
5408b6d6 MD |
582 | break; |
583 | } | |
584 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
585 | { | |
586 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
587 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
588 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
589 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
590 | uint64_t user_token = syscall_event_enabler->user_token; | |
591 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
592 | ||
593 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
594 | switch (type) { | |
595 | case SC_TYPE_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_NATIVE; | |
598 | break; | |
599 | case SC_TYPE_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_NATIVE; | |
602 | break; | |
603 | case SC_TYPE_COMPAT_ENTRY: | |
604 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
605 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
606 | break; | |
607 | case SC_TYPE_COMPAT_EXIT: | |
608 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
609 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
610 | break; | |
611 | } | |
612 | strncat(event_notifier_param.event.name, desc->event_name, | |
613 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
614 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
615 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
616 | event_notifier_param.event.token = user_token; | |
617 | event_notifier_param.error_counter_index = error_counter_index; | |
618 | ||
619 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
620 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
621 | WARN_ON_ONCE(!event_notifier_enabler); | |
622 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); | |
c3fb484e | 623 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 624 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 625 | if (IS_ERR(event)) { |
5408b6d6 MD |
626 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
627 | return; | |
628 | } | |
629 | event->priv->u.syscall.syscall_id = syscall_nr; | |
630 | break; | |
631 | } | |
632 | default: | |
633 | break; | |
634 | } | |
635 | } | |
636 | ||
49c50022 | 637 | static |
67233a18 MD |
638 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
639 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 640 | { |
063f0825 MD |
641 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common); |
642 | const struct lttng_kernel_event_desc *desc; | |
259b6cb3 | 643 | unsigned int i; |
49c50022 | 644 | |
1d303f69 MD |
645 | #ifndef CONFIG_COMPAT |
646 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 647 | return; |
1d303f69 | 648 | #endif |
67233a18 | 649 | /* iterate over all syscall and create event that match */ |
49c50022 | 650 | for (i = 0; i < table_len; i++) { |
19bef247 | 651 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 652 | struct hlist_head *head; |
6768203a | 653 | bool found = false; |
49c50022 | 654 | |
063f0825 | 655 | desc = table[i].desc; |
49c50022 MD |
656 | if (!desc) { |
657 | /* Unknown syscall */ | |
658 | continue; | |
659 | } | |
063f0825 MD |
660 | |
661 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 662 | continue; |
063f0825 | 663 | |
49c50022 | 664 | /* |
3b82c4e1 | 665 | * Check if already created. |
49c50022 | 666 | */ |
0def9170 | 667 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 668 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
6768203a MD |
669 | if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) { |
670 | found = true; | |
671 | break; | |
672 | } | |
3b82c4e1 MD |
673 | } |
674 | if (found) | |
49c50022 | 675 | continue; |
3b82c4e1 | 676 | |
99903379 | 677 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, type, i); |
49c50022 | 678 | } |
49c50022 MD |
679 | } |
680 | ||
552f7c79 MD |
681 | static |
682 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
683 | { | |
684 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
685 | return false; | |
686 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
687 | return false; | |
688 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
689 | return false; | |
690 | if (strcmp(event_enabler->event_param.name, "*")) | |
691 | return false; | |
692 | return true; | |
693 | } | |
694 | ||
9f6f4507 MD |
695 | static |
696 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
697 | { | |
9f6f4507 MD |
698 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); |
699 | struct lttng_kernel_event_common_private *event_priv; | |
700 | const struct lttng_kernel_event_desc *desc; | |
9f6f4507 MD |
701 | bool found = false; |
702 | struct hlist_head *head; | |
703 | ||
1d303f69 MD |
704 | #ifndef CONFIG_COMPAT |
705 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 706 | return; |
1d303f69 | 707 | #endif |
552f7c79 MD |
708 | /* |
709 | * Considering that currently system calls can only be enabled on a per | |
710 | * name basis (or wildcard based on a name), unknown syscall events are | |
711 | * only used when matching *all* system calls, because this is the only | |
712 | * case which can be associated with an unknown system call. | |
713 | * | |
714 | * When enabling system call on a per system call number basis will be | |
715 | * supported, this will need to be revisited. | |
716 | */ | |
717 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
718 | return; | |
719 | ||
9f6f4507 MD |
720 | switch (type) { |
721 | case SC_TYPE_ENTRY: | |
722 | desc = &__event_desc___syscall_entry_unknown; | |
9f6f4507 MD |
723 | break; |
724 | case SC_TYPE_EXIT: | |
725 | desc = &__event_desc___syscall_exit_unknown; | |
9f6f4507 MD |
726 | break; |
727 | case SC_TYPE_COMPAT_ENTRY: | |
728 | desc = &__event_desc___compat_syscall_entry_unknown; | |
9f6f4507 MD |
729 | break; |
730 | case SC_TYPE_COMPAT_EXIT: | |
731 | desc = &__event_desc___compat_syscall_exit_unknown; | |
9f6f4507 MD |
732 | break; |
733 | default: | |
734 | WARN_ON_ONCE(1); | |
735 | } | |
736 | ||
737 | /* | |
738 | * Check if already created. | |
739 | */ | |
740 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); | |
741 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { | |
6768203a | 742 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
9f6f4507 | 743 | found = true; |
6768203a MD |
744 | break; |
745 | } | |
9f6f4507 MD |
746 | } |
747 | if (!found) | |
99903379 | 748 | lttng_syscall_event_enabler_create_event(event_enabler, desc, type, -1U); |
9f6f4507 MD |
749 | } |
750 | ||
d26015f6 | 751 | static |
15a00134 | 752 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 753 | { |
15a00134 | 754 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 755 | |
15a00134 MD |
756 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
757 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
758 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
759 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
760 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
761 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
762 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
763 | } | |
1ab4126a | 764 | |
15a00134 MD |
765 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
766 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
767 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
768 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
769 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
770 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
771 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
772 | } | |
259b6cb3 MD |
773 | } |
774 | ||
775 | /* | |
8a8ac9a8 FD |
776 | * Should be called with sessions lock held. |
777 | */ | |
b2f63bde | 778 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 779 | { |
d26015f6 MD |
780 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
781 | int ret; | |
8a8ac9a8 | 782 | |
0bb716a8 | 783 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 784 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
785 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
786 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 787 | return -ENOMEM; |
8a8ac9a8 | 788 | } |
0bb716a8 | 789 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
790 | /* create syscall table mapping syscall to events */ |
791 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 792 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 793 | return -ENOMEM; |
8a8ac9a8 FD |
794 | } |
795 | ||
796 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 797 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 798 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
799 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
800 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 801 | return -ENOMEM; |
8a8ac9a8 FD |
802 | } |
803 | ||
0bb716a8 | 804 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
805 | /* create syscall table mapping compat syscall to events */ |
806 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 807 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 808 | return -ENOMEM; |
8a8ac9a8 FD |
809 | } |
810 | #endif | |
0bb716a8 MD |
811 | if (!syscall_table->sc_filter) { |
812 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 813 | GFP_KERNEL); |
0bb716a8 | 814 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
815 | return -ENOMEM; |
816 | } | |
817 | ||
0bb716a8 | 818 | if (!syscall_table->sys_enter_registered) { |
a6837bed | 819 | ret = lttng_tracepoint_probe_register("sys_enter", |
0bb716a8 | 820 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
821 | if (ret) |
822 | return ret; | |
0bb716a8 | 823 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 824 | } |
0bb716a8 | 825 | if (!syscall_table->sys_exit_registered) { |
a6837bed | 826 | ret = lttng_tracepoint_probe_register("sys_exit", |
0bb716a8 | 827 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 | 828 | if (ret) { |
a6837bed | 829 | WARN_ON_ONCE(lttng_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 830 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
831 | return ret; |
832 | } | |
0bb716a8 | 833 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 834 | } |
0fab709d | 835 | |
86e12a51 MD |
836 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
837 | ||
fad51c94 | 838 | return 0; |
8a8ac9a8 FD |
839 | } |
840 | ||
6053e75e | 841 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
842 | { |
843 | int ret; | |
844 | ||
0bb716a8 | 845 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 846 | return 0; |
0bb716a8 | 847 | if (syscall_table->sys_enter_registered) { |
a6837bed | 848 | ret = lttng_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 849 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
850 | if (ret) |
851 | return ret; | |
0bb716a8 | 852 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 853 | } |
0bb716a8 | 854 | if (syscall_table->sys_exit_registered) { |
a6837bed | 855 | ret = lttng_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 856 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
857 | if (ret) |
858 | return ret; | |
0bb716a8 | 859 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 860 | } |
badfe9f5 MD |
861 | return 0; |
862 | } | |
863 | ||
6053e75e | 864 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 865 | { |
0bb716a8 MD |
866 | kfree(syscall_table->syscall_dispatch); |
867 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 868 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
869 | kfree(syscall_table->compat_syscall_dispatch); |
870 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 871 | #endif |
0bb716a8 | 872 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
873 | return 0; |
874 | } | |
875 | ||
12e579db MD |
876 | static |
877 | uint32_t get_sc_tables_len(void) | |
878 | { | |
ebcc64cd | 879 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
880 | } |
881 | ||
badfe9f5 | 882 | static |
ade8a729 FD |
883 | const char *get_syscall_name(const char *desc_name, |
884 | enum lttng_syscall_abi abi, | |
885 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 886 | { |
badfe9f5 | 887 | size_t prefix_len = 0; |
80f87dd2 | 888 | |
80f87dd2 | 889 | |
ade8a729 | 890 | switch (entryexit) { |
badfe9f5 | 891 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 892 | switch (abi) { |
badfe9f5 MD |
893 | case LTTNG_SYSCALL_ABI_NATIVE: |
894 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
895 | break; | |
896 | case LTTNG_SYSCALL_ABI_COMPAT: | |
897 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
898 | break; | |
80f87dd2 | 899 | } |
badfe9f5 MD |
900 | break; |
901 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 902 | switch (abi) { |
badfe9f5 MD |
903 | case LTTNG_SYSCALL_ABI_NATIVE: |
904 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
905 | break; | |
906 | case LTTNG_SYSCALL_ABI_COMPAT: | |
907 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
908 | break; | |
80f87dd2 | 909 | } |
badfe9f5 | 910 | break; |
80f87dd2 | 911 | } |
badfe9f5 | 912 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 913 | return desc_name + prefix_len; |
badfe9f5 MD |
914 | } |
915 | ||
ade8a729 FD |
916 | static |
917 | int lttng_syscall_filter_enable( | |
918 | struct lttng_syscall_filter *filter, | |
919 | const char *desc_name, enum lttng_syscall_abi abi, | |
99903379 MD |
920 | enum lttng_syscall_entryexit entryexit, |
921 | unsigned int syscall_id) | |
badfe9f5 | 922 | { |
badfe9f5 MD |
923 | const char *syscall_name; |
924 | unsigned long *bitmap; | |
7f52f0d4 | 925 | u32 *refcount_map; |
badfe9f5 | 926 | |
ade8a729 | 927 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 928 | |
ade8a729 | 929 | switch (entryexit) { |
badfe9f5 | 930 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 931 | switch (abi) { |
badfe9f5 MD |
932 | case LTTNG_SYSCALL_ABI_NATIVE: |
933 | bitmap = filter->sc_entry; | |
7f52f0d4 | 934 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
935 | break; |
936 | case LTTNG_SYSCALL_ABI_COMPAT: | |
937 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 938 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 939 | break; |
6d9694d8 MD |
940 | default: |
941 | return -EINVAL; | |
80f87dd2 | 942 | } |
badfe9f5 MD |
943 | break; |
944 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 945 | switch (abi) { |
badfe9f5 MD |
946 | case LTTNG_SYSCALL_ABI_NATIVE: |
947 | bitmap = filter->sc_exit; | |
7f52f0d4 | 948 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
949 | break; |
950 | case LTTNG_SYSCALL_ABI_COMPAT: | |
951 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 952 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 953 | break; |
6d9694d8 MD |
954 | default: |
955 | return -EINVAL; | |
80f87dd2 | 956 | } |
badfe9f5 MD |
957 | break; |
958 | default: | |
959 | return -EINVAL; | |
80f87dd2 | 960 | } |
99903379 | 961 | if (refcount_map[syscall_id] == U32_MAX) |
7f52f0d4 | 962 | return -EOVERFLOW; |
99903379 MD |
963 | if (refcount_map[syscall_id]++ == 0) |
964 | bitmap_set(bitmap, syscall_id, 1); | |
80f87dd2 | 965 | return 0; |
80f87dd2 MD |
966 | } |
967 | ||
9b2f1c54 | 968 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 969 | { |
9b2f1c54 | 970 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
971 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
972 | struct hlist_head *dispatch_list; | |
ca62543e | 973 | int ret = 0; |
8a8ac9a8 | 974 | |
9b2f1c54 | 975 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 976 | |
99903379 MD |
977 | /* Unknown syscall */ |
978 | if (syscall_id == -1U) { | |
979 | switch (event->priv->u.syscall.entryexit) { | |
980 | case LTTNG_SYSCALL_ENTRY: | |
981 | switch (event->priv->u.syscall.abi) { | |
982 | case LTTNG_SYSCALL_ABI_NATIVE: | |
983 | dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
984 | break; | |
985 | case LTTNG_SYSCALL_ABI_COMPAT: | |
986 | dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
987 | break; | |
988 | default: | |
989 | ret = -EINVAL; | |
990 | goto end; | |
991 | } | |
9cd106a6 | 992 | break; |
99903379 MD |
993 | case LTTNG_SYSCALL_EXIT: |
994 | switch (event->priv->u.syscall.abi) { | |
995 | case LTTNG_SYSCALL_ABI_NATIVE: | |
996 | dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
997 | break; | |
998 | case LTTNG_SYSCALL_ABI_COMPAT: | |
999 | dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
1000 | break; | |
1001 | default: | |
1002 | ret = -EINVAL; | |
1003 | goto end; | |
1004 | } | |
9cd106a6 MD |
1005 | break; |
1006 | default: | |
1007 | ret = -EINVAL; | |
1008 | goto end; | |
1009 | } | |
99903379 MD |
1010 | } else { |
1011 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, | |
1012 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1013 | event->priv->u.syscall.entryexit, syscall_id); | |
1014 | if (ret) | |
1015 | return ret; | |
1016 | ||
1017 | switch (event->priv->u.syscall.entryexit) { | |
1018 | case LTTNG_SYSCALL_ENTRY: | |
1019 | switch (event->priv->u.syscall.abi) { | |
1020 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1021 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1022 | break; | |
1023 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1024 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1025 | break; | |
1026 | default: | |
1027 | ret = -EINVAL; | |
1028 | goto end; | |
1029 | } | |
8a8ac9a8 | 1030 | break; |
99903379 MD |
1031 | case LTTNG_SYSCALL_EXIT: |
1032 | switch (event->priv->u.syscall.abi) { | |
1033 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1034 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1035 | break; | |
1036 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1037 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1038 | break; | |
1039 | default: | |
1040 | ret = -EINVAL; | |
1041 | goto end; | |
1042 | } | |
8a8ac9a8 | 1043 | break; |
6866b1c7 MJ |
1044 | default: |
1045 | ret = -EINVAL; | |
1046 | goto end; | |
8a8ac9a8 | 1047 | } |
8a8ac9a8 | 1048 | } |
9cd106a6 MD |
1049 | |
1050 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1051 | end: |
9b2f1c54 | 1052 | return ret; |
ade8a729 FD |
1053 | } |
1054 | ||
1055 | static | |
f2db8be3 | 1056 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 | 1057 | const char *desc_name, enum lttng_syscall_abi abi, |
99903379 MD |
1058 | enum lttng_syscall_entryexit entryexit, |
1059 | unsigned int syscall_id) | |
ade8a729 | 1060 | { |
badfe9f5 MD |
1061 | const char *syscall_name; |
1062 | unsigned long *bitmap; | |
7f52f0d4 | 1063 | u32 *refcount_map; |
80f87dd2 | 1064 | |
ade8a729 | 1065 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1066 | |
ade8a729 | 1067 | switch (entryexit) { |
badfe9f5 | 1068 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1069 | switch (abi) { |
badfe9f5 MD |
1070 | case LTTNG_SYSCALL_ABI_NATIVE: |
1071 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1072 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1073 | break; |
1074 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1075 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1076 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1077 | break; |
6d9694d8 MD |
1078 | default: |
1079 | return -EINVAL; | |
80f87dd2 | 1080 | } |
badfe9f5 MD |
1081 | break; |
1082 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1083 | switch (abi) { |
badfe9f5 MD |
1084 | case LTTNG_SYSCALL_ABI_NATIVE: |
1085 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1086 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1087 | break; |
1088 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1089 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1090 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1091 | break; |
6d9694d8 MD |
1092 | default: |
1093 | return -EINVAL; | |
80f87dd2 | 1094 | } |
badfe9f5 MD |
1095 | break; |
1096 | default: | |
1097 | return -EINVAL; | |
80f87dd2 | 1098 | } |
99903379 | 1099 | if (refcount_map[syscall_id] == 0) |
7f52f0d4 | 1100 | return -ENOENT; |
99903379 MD |
1101 | if (--refcount_map[syscall_id] == 0) |
1102 | bitmap_clear(bitmap, syscall_id, 1); | |
badfe9f5 | 1103 | return 0; |
259b6cb3 | 1104 | } |
2d2464bd | 1105 | |
9b2f1c54 | 1106 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1107 | { |
9b2f1c54 | 1108 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
7f52f0d4 | 1109 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
8a8ac9a8 FD |
1110 | int ret; |
1111 | ||
99903379 MD |
1112 | /* Except for unknown syscall */ |
1113 | if (syscall_id != -1U) { | |
1114 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, | |
1115 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1116 | event->priv->u.syscall.entryexit, syscall_id); | |
1117 | if (ret) | |
1118 | return ret; | |
1119 | } | |
9cd106a6 | 1120 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1121 | return 0; |
1122 | } | |
1123 | ||
9cb5be7e MD |
1124 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1125 | { | |
1126 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1127 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1128 | int enabled = event_enabler->enabled; | |
1129 | ||
552f7c79 | 1130 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1131 | return; |
9cb5be7e MD |
1132 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1133 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1134 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1135 | ||
1136 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1137 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1138 | } | |
1139 | ||
2d2464bd MD |
1140 | static |
1141 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1142 | { | |
1143 | const struct trace_syscall_entry *entry; | |
1144 | int iter = 0; | |
1145 | ||
ebcc64cd FD |
1146 | for (entry = sc_table.table; |
1147 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1148 | entry++) { |
1149 | if (iter++ >= *pos) | |
1150 | return entry; | |
1151 | } | |
ebcc64cd FD |
1152 | for (entry = compat_sc_table.table; |
1153 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1154 | entry++) { |
1155 | if (iter++ >= *pos) | |
1156 | return entry; | |
1157 | } | |
1158 | /* End of list */ | |
1159 | return NULL; | |
1160 | } | |
1161 | ||
1162 | static | |
1163 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1164 | { | |
1165 | return (void *) syscall_list_get_entry(pos); | |
1166 | } | |
1167 | ||
1168 | static | |
1169 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1170 | { | |
1171 | (*ppos)++; | |
1172 | return (void *) syscall_list_get_entry(ppos); | |
1173 | } | |
1174 | ||
1175 | static | |
1176 | void syscall_list_stop(struct seq_file *m, void *p) | |
1177 | { | |
1178 | } | |
1179 | ||
12e579db MD |
1180 | static |
1181 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1182 | const struct trace_syscall_entry **table, | |
1183 | unsigned int *bitness) | |
1184 | { | |
ebcc64cd | 1185 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1186 | if (bitness) |
1187 | *bitness = BITS_PER_LONG; | |
1188 | if (table) | |
ebcc64cd | 1189 | *table = sc_table.table; |
12e579db MD |
1190 | return 0; |
1191 | } | |
ebcc64cd FD |
1192 | if (!(entry >= compat_sc_table.table |
1193 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1194 | return -EINVAL; |
1195 | } | |
1196 | if (bitness) | |
1197 | *bitness = 32; | |
1198 | if (table) | |
ebcc64cd | 1199 | *table = compat_sc_table.table; |
12e579db MD |
1200 | return 0; |
1201 | } | |
1202 | ||
2d2464bd MD |
1203 | static |
1204 | int syscall_list_show(struct seq_file *m, void *p) | |
1205 | { | |
1206 | const struct trace_syscall_entry *table, *entry = p; | |
1207 | unsigned int bitness; | |
d4291869 | 1208 | unsigned long index; |
12e579db | 1209 | int ret; |
d4291869 | 1210 | const char *name; |
2d2464bd | 1211 | |
12e579db MD |
1212 | ret = get_sc_table(entry, &table, &bitness); |
1213 | if (ret) | |
1214 | return ret; | |
f4855b46 MD |
1215 | if (!entry->desc) |
1216 | return 0; | |
ebcc64cd | 1217 | if (table == sc_table.table) { |
d4291869 | 1218 | index = entry - table; |
437d5aa5 | 1219 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1220 | } else { |
ebcc64cd | 1221 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1222 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1223 | } |
12e579db | 1224 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1225 | index, name, bitness); |
2d2464bd MD |
1226 | return 0; |
1227 | } | |
1228 | ||
1229 | static | |
1230 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1231 | .start = syscall_list_start, | |
1232 | .next = syscall_list_next, | |
1233 | .stop = syscall_list_stop, | |
1234 | .show = syscall_list_show, | |
1235 | }; | |
1236 | ||
1237 | static | |
1238 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1239 | { | |
1240 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1241 | } | |
1242 | ||
1243 | const struct file_operations lttng_syscall_list_fops = { | |
1244 | .owner = THIS_MODULE, | |
1245 | .open = lttng_syscall_list_open, | |
1246 | .read = seq_read, | |
1247 | .llseek = seq_lseek, | |
1248 | .release = seq_release, | |
1249 | }; | |
12e579db | 1250 | |
badfe9f5 MD |
1251 | /* |
1252 | * A syscall is enabled if it is traced for either entry or exit. | |
1253 | */ | |
c970b655 | 1254 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1255 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1256 | { |
1257 | uint32_t len, sc_tables_len, bitmask_len; | |
1258 | int ret = 0, bit; | |
1259 | char *tmp_mask; | |
1260 | struct lttng_syscall_filter *filter; | |
1261 | ||
1262 | ret = get_user(len, &usyscall_mask->len); | |
1263 | if (ret) | |
1264 | return ret; | |
1265 | sc_tables_len = get_sc_tables_len(); | |
1266 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1267 | if (len < sc_tables_len) { | |
1268 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1269 | } | |
1270 | /* Array is large enough, we can copy array to user-space. */ | |
1271 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1272 | if (!tmp_mask) | |
1273 | return -ENOMEM; | |
0bb716a8 | 1274 | filter = syscall_table->sc_filter; |
12e579db | 1275 | |
ebcc64cd | 1276 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1277 | char state; |
2f25059d | 1278 | |
0bb716a8 MD |
1279 | if (syscall_table->syscall_dispatch) { |
1280 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1281 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1282 | state = test_bit(bit, filter->sc_entry) |
1283 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1284 | else |
1285 | state = 1; | |
1286 | } else { | |
1287 | state = 0; | |
1288 | } | |
1289 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1290 | } |
1291 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1292 | char state; |
2f25059d | 1293 | |
0bb716a8 MD |
1294 | if (syscall_table->compat_syscall_dispatch) { |
1295 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1296 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1297 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1298 | filter->sc_compat_entry) |
ebcc64cd | 1299 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1300 | filter->sc_compat_exit); |
2f25059d MD |
1301 | else |
1302 | state = 1; | |
1303 | } else { | |
1304 | state = 0; | |
1305 | } | |
1306 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1307 | } |
1308 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1309 | ret = -EFAULT; | |
1310 | kfree(tmp_mask); | |
1311 | return ret; | |
1312 | } | |
082d4946 MD |
1313 | |
1314 | int lttng_abi_syscall_list(void) | |
1315 | { | |
1316 | struct file *syscall_list_file; | |
1317 | int file_fd, ret; | |
1318 | ||
2a059b14 | 1319 | file_fd = get_unused_fd_flags(0); |
082d4946 MD |
1320 | if (file_fd < 0) { |
1321 | ret = file_fd; | |
1322 | goto fd_error; | |
1323 | } | |
1324 | ||
1325 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1326 | <tng_syscall_list_fops, | |
1327 | NULL, O_RDWR); | |
1328 | if (IS_ERR(syscall_list_file)) { | |
1329 | ret = PTR_ERR(syscall_list_file); | |
1330 | goto file_error; | |
1331 | } | |
1332 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1333 | if (ret < 0) | |
1334 | goto open_error; | |
1335 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1336 | return file_fd; |
1337 | ||
1338 | open_error: | |
1339 | fput(syscall_list_file); | |
1340 | file_error: | |
1341 | put_unused_fd(file_fd); | |
1342 | fd_error: | |
1343 | return ret; | |
1344 | } |