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> |
2df37e95 | 31 | #include <lttng/events.h> |
6f156b09 | 32 | #include <lttng/events-internal.h> |
8a8ac9a8 | 33 | #include <lttng/utils.h> |
259b6cb3 | 34 | |
ebcc64cd FD |
35 | #include "lttng-syscalls.h" |
36 | ||
6333ace3 | 37 | #ifndef CONFIG_COMPAT |
bfa949bf MD |
38 | # ifndef is_compat_task |
39 | # define is_compat_task() (0) | |
40 | # endif | |
6333ace3 MD |
41 | #endif |
42 | ||
1aa3298b MD |
43 | /* in_compat_syscall appears in kernel 4.6. */ |
44 | #ifndef in_compat_syscall | |
45 | #define in_compat_syscall() is_compat_task() | |
46 | #endif | |
47 | ||
5b7ac358 MD |
48 | enum sc_type { |
49 | SC_TYPE_ENTRY, | |
50 | SC_TYPE_EXIT, | |
51 | SC_TYPE_COMPAT_ENTRY, | |
52 | SC_TYPE_COMPAT_EXIT, | |
53 | }; | |
54 | ||
d4291869 MD |
55 | #define SYSCALL_ENTRY_TOK syscall_entry_ |
56 | #define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_ | |
57 | #define SYSCALL_EXIT_TOK syscall_exit_ | |
58 | #define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_ | |
59 | ||
60 | #define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK) | |
61 | #define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK) | |
62 | #define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK) | |
63 | #define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK) | |
5b7ac358 | 64 | |
2d6d88c6 | 65 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); |
2d6d88c6 | 66 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret); |
259b6cb3 | 67 | |
3a523f5b MD |
68 | /* |
69 | * Forward declarations for old kernels. | |
70 | */ | |
71 | struct mmsghdr; | |
72 | struct rlimit64; | |
73 | struct oldold_utsname; | |
74 | struct old_utsname; | |
75 | struct sel_arg_struct; | |
76 | struct mmap_arg_struct; | |
c0b71117 | 77 | struct file_handle; |
a292e6f1 | 78 | struct user_msghdr; |
3a523f5b | 79 | |
9eb15e8b MJ |
80 | /* |
81 | * Forward declaration for kernels >= 5.6 | |
82 | */ | |
83 | struct timex; | |
edfdcb68 MJ |
84 | struct timeval; |
85 | struct itimerval; | |
86 | struct itimerspec; | |
87 | ||
5f4c791e | 88 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) |
edfdcb68 MJ |
89 | typedef __kernel_old_time_t time_t; |
90 | #endif | |
9eb15e8b | 91 | |
80f87dd2 MD |
92 | #ifdef IA32_NR_syscalls |
93 | #define NR_compat_syscalls IA32_NR_syscalls | |
94 | #else | |
95 | #define NR_compat_syscalls NR_syscalls | |
96 | #endif | |
97 | ||
259b6cb3 MD |
98 | /* |
99 | * Create LTTng tracepoint probes. | |
100 | */ | |
101 | #define LTTNG_PACKAGE_BUILD | |
102 | #define CREATE_TRACE_POINTS | |
2655f9ad | 103 | #define TP_MODULE_NOINIT |
c075712b | 104 | #define TRACE_INCLUDE_PATH instrumentation/syscalls/headers |
259b6cb3 | 105 | |
a93244f8 MD |
106 | #define PARAMS(args...) args |
107 | ||
5b7ac358 | 108 | /* Handle unknown syscalls */ |
72a52753 | 109 | #undef TRACE_SYSTEM |
5b7ac358 | 110 | #define TRACE_SYSTEM syscalls_unknown |
241ae9a8 | 111 | #include <instrumentation/syscalls/headers/syscalls_unknown.h> |
5b7ac358 MD |
112 | #undef TRACE_SYSTEM |
113 | ||
5b7ac358 | 114 | #undef TP_PROBE_CB |
fc4f7161 | 115 | |
e42c4f49 FD |
116 | extern const struct trace_syscall_table sc_table; |
117 | extern const struct trace_syscall_table compat_sc_table; | |
5b7ac358 | 118 | |
2d6d88c6 | 119 | /* Event syscall exit table */ |
e42c4f49 FD |
120 | extern const struct trace_syscall_table sc_exit_table; |
121 | extern const struct trace_syscall_table compat_sc_exit_table; | |
ebcc64cd FD |
122 | |
123 | ||
fc4f7161 MD |
124 | #undef SC_EXIT |
125 | ||
a93244f8 | 126 | #undef CREATE_SYSCALL_TABLE |
2faf7d1b | 127 | |
80f87dd2 | 128 | struct lttng_syscall_filter { |
badfe9f5 MD |
129 | DECLARE_BITMAP(sc_entry, NR_syscalls); |
130 | DECLARE_BITMAP(sc_exit, NR_syscalls); | |
131 | DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls); | |
132 | DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls); | |
7f52f0d4 MD |
133 | |
134 | /* | |
135 | * Reference counters keeping track of number of events enabled | |
136 | * for each bit. | |
137 | */ | |
138 | u32 sc_entry_refcount_map[NR_syscalls]; | |
139 | u32 sc_exit_refcount_map[NR_syscalls]; | |
140 | u32 sc_compat_entry_refcount_map[NR_compat_syscalls]; | |
141 | u32 sc_compat_exit_refcount_map[NR_compat_syscalls]; | |
80f87dd2 MD |
142 | }; |
143 | ||
3b82c4e1 | 144 | static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 145 | struct pt_regs *regs, long id) |
f405cfce | 146 | { |
1b7b9c65 | 147 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 148 | struct lttng_kernel_event_common_private *event_priv; |
f405cfce | 149 | |
1b7b9c65 | 150 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 151 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
8a8ac9a8 | 152 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 153 | __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 | 154 | else |
e2d5dbc7 | 155 | __event_probe__syscall_entry_unknown(event_priv->pub, id, args); |
8a8ac9a8 FD |
156 | } |
157 | } | |
158 | ||
63aa9160 | 159 | static __always_inline |
e2d5dbc7 | 160 | void syscall_entry_event_call_func(struct hlist_head *action_list, |
3b82c4e1 | 161 | void *func, unsigned int nrargs, |
63aa9160 | 162 | struct pt_regs *regs) |
259b6cb3 | 163 | { |
a67ba386 | 164 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 165 | |
63aa9160 | 166 | switch (nrargs) { |
259b6cb3 MD |
167 | case 0: |
168 | { | |
63aa9160 | 169 | void (*fptr)(void *__data) = func; |
259b6cb3 | 170 | |
e2d5dbc7 MD |
171 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
172 | fptr(event_priv->pub); | |
259b6cb3 MD |
173 | break; |
174 | } | |
175 | case 1: | |
176 | { | |
63aa9160 | 177 | void (*fptr)(void *__data, unsigned long arg0) = func; |
1b7b9c65 | 178 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 179 | |
1b7b9c65 | 180 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
181 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
182 | fptr(event_priv->pub, args[0]); | |
259b6cb3 MD |
183 | break; |
184 | } | |
185 | case 2: | |
186 | { | |
187 | void (*fptr)(void *__data, | |
188 | unsigned long arg0, | |
63aa9160 | 189 | unsigned long arg1) = func; |
1b7b9c65 | 190 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 191 | |
1b7b9c65 | 192 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
193 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
194 | fptr(event_priv->pub, args[0], args[1]); | |
259b6cb3 MD |
195 | break; |
196 | } | |
197 | case 3: | |
198 | { | |
199 | void (*fptr)(void *__data, | |
200 | unsigned long arg0, | |
201 | unsigned long arg1, | |
63aa9160 | 202 | unsigned long arg2) = func; |
1b7b9c65 | 203 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 204 | |
1b7b9c65 | 205 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
206 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
207 | fptr(event_priv->pub, args[0], args[1], args[2]); | |
259b6cb3 MD |
208 | break; |
209 | } | |
210 | case 4: | |
211 | { | |
212 | void (*fptr)(void *__data, | |
213 | unsigned long arg0, | |
214 | unsigned long arg1, | |
215 | unsigned long arg2, | |
63aa9160 | 216 | unsigned long arg3) = func; |
1b7b9c65 | 217 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 218 | |
1b7b9c65 | 219 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
220 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
221 | fptr(event_priv->pub, args[0], args[1], args[2], args[3]); | |
259b6cb3 MD |
222 | break; |
223 | } | |
224 | case 5: | |
225 | { | |
226 | void (*fptr)(void *__data, | |
227 | unsigned long arg0, | |
228 | unsigned long arg1, | |
229 | unsigned long arg2, | |
230 | unsigned long arg3, | |
63aa9160 | 231 | unsigned long arg4) = 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], args[3], args[4]); | |
259b6cb3 MD |
237 | break; |
238 | } | |
239 | case 6: | |
240 | { | |
241 | void (*fptr)(void *__data, | |
242 | unsigned long arg0, | |
243 | unsigned long arg1, | |
244 | unsigned long arg2, | |
245 | unsigned long arg3, | |
246 | unsigned long arg4, | |
63aa9160 | 247 | unsigned long arg5) = func; |
1b7b9c65 | 248 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
259b6cb3 | 249 | |
1b7b9c65 | 250 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
251 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
252 | fptr(event_priv->pub, args[0], args[1], args[2], | |
3b82c4e1 | 253 | args[3], args[4], args[5]); |
8a8ac9a8 FD |
254 | break; |
255 | } | |
256 | default: | |
257 | break; | |
258 | } | |
259 | } | |
260 | ||
63aa9160 FD |
261 | void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) |
262 | { | |
0bb716a8 | 263 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 | 264 | struct hlist_head *action_list, *unknown_action_list; |
63aa9160 FD |
265 | const struct trace_syscall_entry *table, *entry; |
266 | size_t table_len; | |
267 | ||
268 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 269 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
270 | |
271 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 272 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) { |
63aa9160 FD |
273 | /* System call filtered out. */ |
274 | return; | |
275 | } | |
ebcc64cd FD |
276 | table = compat_sc_table.table; |
277 | table_len = compat_sc_table.len; | |
0bb716a8 | 278 | unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch; |
63aa9160 | 279 | } else { |
0bb716a8 | 280 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
63aa9160 FD |
281 | |
282 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 283 | || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) { |
63aa9160 FD |
284 | /* System call filtered out. */ |
285 | return; | |
286 | } | |
ebcc64cd FD |
287 | table = sc_table.table; |
288 | table_len = sc_table.len; | |
0bb716a8 | 289 | unknown_action_list = &syscall_table->unknown_syscall_dispatch; |
63aa9160 FD |
290 | } |
291 | if (unlikely(id < 0 || id >= table_len)) { | |
3b82c4e1 | 292 | syscall_entry_event_unknown(unknown_action_list, regs, id); |
63aa9160 FD |
293 | return; |
294 | } | |
3b82c4e1 MD |
295 | |
296 | entry = &table[id]; | |
297 | if (!entry->event_func) { | |
298 | syscall_entry_event_unknown(unknown_action_list, regs, id); | |
63aa9160 FD |
299 | return; |
300 | } | |
3b82c4e1 MD |
301 | |
302 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 303 | action_list = &syscall_table->compat_syscall_dispatch[id]; |
3b82c4e1 | 304 | } else { |
0bb716a8 | 305 | action_list = &syscall_table->syscall_dispatch[id]; |
3b82c4e1 MD |
306 | } |
307 | if (unlikely(hlist_empty(action_list))) | |
308 | return; | |
309 | ||
e2d5dbc7 | 310 | syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs); |
63aa9160 FD |
311 | } |
312 | ||
3b82c4e1 | 313 | static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head, |
8a8ac9a8 | 314 | struct pt_regs *regs, long id, long ret) |
5b7ac358 | 315 | { |
1b7b9c65 | 316 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
a67ba386 | 317 | struct lttng_kernel_event_common_private *event_priv; |
5b7ac358 | 318 | |
1b7b9c65 | 319 | lttng_syscall_get_arguments(current, regs, args); |
a67ba386 | 320 | lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) { |
3b82c4e1 | 321 | if (unlikely(in_compat_syscall())) |
e2d5dbc7 | 322 | __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret, |
3b82c4e1 MD |
323 | args); |
324 | else | |
e2d5dbc7 | 325 | __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args); |
3b82c4e1 | 326 | } |
5b7ac358 MD |
327 | } |
328 | ||
3b82c4e1 | 329 | static __always_inline |
e2d5dbc7 | 330 | void syscall_exit_event_call_func(struct hlist_head *action_list, |
3b82c4e1 MD |
331 | void *func, unsigned int nrargs, |
332 | struct pt_regs *regs, long ret) | |
5b7ac358 | 333 | { |
a67ba386 | 334 | struct lttng_kernel_event_common_private *event_priv; |
badfe9f5 | 335 | |
3b82c4e1 | 336 | switch (nrargs) { |
5b7ac358 MD |
337 | case 0: |
338 | { | |
3b82c4e1 | 339 | void (*fptr)(void *__data, long ret) = func; |
5b7ac358 | 340 | |
e2d5dbc7 MD |
341 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
342 | fptr(event_priv->pub, ret); | |
5b7ac358 MD |
343 | break; |
344 | } | |
345 | case 1: | |
346 | { | |
347 | void (*fptr)(void *__data, | |
fc4f7161 | 348 | long ret, |
3b82c4e1 | 349 | unsigned long arg0) = func; |
1b7b9c65 | 350 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 351 | |
1b7b9c65 | 352 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
353 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
354 | fptr(event_priv->pub, ret, args[0]); | |
5b7ac358 MD |
355 | break; |
356 | } | |
357 | case 2: | |
358 | { | |
359 | void (*fptr)(void *__data, | |
fc4f7161 | 360 | long ret, |
5b7ac358 | 361 | unsigned long arg0, |
3b82c4e1 | 362 | unsigned long arg1) = func; |
1b7b9c65 | 363 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 364 | |
1b7b9c65 | 365 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
366 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
367 | fptr(event_priv->pub, ret, args[0], args[1]); | |
5b7ac358 MD |
368 | break; |
369 | } | |
370 | case 3: | |
371 | { | |
372 | void (*fptr)(void *__data, | |
fc4f7161 | 373 | long ret, |
5b7ac358 MD |
374 | unsigned long arg0, |
375 | unsigned long arg1, | |
3b82c4e1 | 376 | unsigned long arg2) = func; |
1b7b9c65 | 377 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 378 | |
1b7b9c65 | 379 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
380 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
381 | fptr(event_priv->pub, ret, args[0], args[1], args[2]); | |
5b7ac358 MD |
382 | break; |
383 | } | |
384 | case 4: | |
385 | { | |
386 | void (*fptr)(void *__data, | |
fc4f7161 | 387 | long ret, |
5b7ac358 MD |
388 | unsigned long arg0, |
389 | unsigned long arg1, | |
390 | unsigned long arg2, | |
3b82c4e1 | 391 | unsigned long arg3) = func; |
1b7b9c65 | 392 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 393 | |
1b7b9c65 | 394 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
395 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
396 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]); | |
5b7ac358 MD |
397 | break; |
398 | } | |
399 | case 5: | |
400 | { | |
401 | void (*fptr)(void *__data, | |
fc4f7161 | 402 | long ret, |
5b7ac358 MD |
403 | unsigned long arg0, |
404 | unsigned long arg1, | |
405 | unsigned long arg2, | |
406 | unsigned long arg3, | |
3b82c4e1 | 407 | unsigned long arg4) = func; |
1b7b9c65 | 408 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 409 | |
1b7b9c65 | 410 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
411 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
412 | fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]); | |
5b7ac358 MD |
413 | break; |
414 | } | |
415 | case 6: | |
416 | { | |
417 | void (*fptr)(void *__data, | |
fc4f7161 | 418 | long ret, |
5b7ac358 MD |
419 | unsigned long arg0, |
420 | unsigned long arg1, | |
421 | unsigned long arg2, | |
422 | unsigned long arg3, | |
423 | unsigned long arg4, | |
3b82c4e1 | 424 | unsigned long arg5) = func; |
1b7b9c65 | 425 | unsigned long args[LTTNG_SYSCALL_NR_ARGS]; |
5b7ac358 | 426 | |
1b7b9c65 | 427 | lttng_syscall_get_arguments(current, regs, args); |
e2d5dbc7 MD |
428 | lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node) |
429 | fptr(event_priv->pub, ret, args[0], args[1], args[2], | |
3b82c4e1 | 430 | args[3], args[4], args[5]); |
5b7ac358 MD |
431 | break; |
432 | } | |
433 | default: | |
434 | break; | |
435 | } | |
436 | } | |
437 | ||
3b82c4e1 MD |
438 | void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) |
439 | { | |
0bb716a8 | 440 | struct lttng_kernel_syscall_table *syscall_table = __data; |
3b82c4e1 MD |
441 | struct hlist_head *action_list, *unknown_action_list; |
442 | const struct trace_syscall_entry *table, *entry; | |
443 | size_t table_len; | |
444 | long id; | |
445 | ||
446 | id = syscall_get_nr(current, regs); | |
447 | ||
448 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 449 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
450 | |
451 | if (id < 0 || id >= NR_compat_syscalls | |
0bb716a8 | 452 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) { |
3b82c4e1 MD |
453 | /* System call filtered out. */ |
454 | return; | |
455 | } | |
ebcc64cd FD |
456 | table = compat_sc_exit_table.table; |
457 | table_len = compat_sc_exit_table.len; | |
0bb716a8 | 458 | unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch; |
3b82c4e1 | 459 | } else { |
0bb716a8 | 460 | struct lttng_syscall_filter *filter = syscall_table->sc_filter; |
3b82c4e1 MD |
461 | |
462 | if (id < 0 || id >= NR_syscalls | |
0bb716a8 | 463 | || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) { |
3b82c4e1 MD |
464 | /* System call filtered out. */ |
465 | return; | |
466 | } | |
ebcc64cd FD |
467 | table = sc_exit_table.table; |
468 | table_len = sc_exit_table.len; | |
0bb716a8 | 469 | unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch; |
3b82c4e1 MD |
470 | } |
471 | if (unlikely(id < 0 || id >= table_len)) { | |
472 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
473 | return; | |
474 | } | |
475 | ||
476 | entry = &table[id]; | |
477 | if (!entry->event_func) { | |
478 | syscall_exit_event_unknown(unknown_action_list, regs, id, ret); | |
479 | return; | |
480 | } | |
481 | ||
482 | if (unlikely(in_compat_syscall())) { | |
0bb716a8 | 483 | action_list = &syscall_table->compat_syscall_exit_dispatch[id]; |
3b82c4e1 | 484 | } else { |
0bb716a8 | 485 | action_list = &syscall_table->syscall_exit_dispatch[id]; |
3b82c4e1 MD |
486 | } |
487 | if (unlikely(hlist_empty(action_list))) | |
488 | return; | |
489 | ||
e2d5dbc7 | 490 | syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs, |
3b82c4e1 MD |
491 | regs, ret); |
492 | } | |
493 | ||
0bb716a8 MD |
494 | static |
495 | struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler) | |
8a8ac9a8 | 496 | { |
0bb716a8 MD |
497 | switch (event_enabler->enabler_type) { |
498 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
499 | { | |
1ae083ba MD |
500 | struct lttng_event_recorder_enabler *event_recorder_enabler = |
501 | container_of(event_enabler, struct lttng_event_recorder_enabler, parent); | |
0bb716a8 | 502 | return &event_recorder_enabler->chan->priv->parent.syscall_table; |
8a8ac9a8 | 503 | } |
0bb716a8 MD |
504 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
505 | { | |
506 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
507 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
508 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 509 | } |
0bb716a8 MD |
510 | default: |
511 | return NULL; | |
8a8ac9a8 | 512 | } |
0bb716a8 | 513 | } |
8a8ac9a8 | 514 | |
0bb716a8 MD |
515 | static |
516 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
517 | { | |
518 | switch (event->type) { | |
519 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
520 | { | |
521 | struct lttng_kernel_event_recorder *event_recorder = | |
522 | container_of(event, struct lttng_kernel_event_recorder, parent); | |
523 | return &event_recorder->chan->priv->parent.syscall_table; | |
524 | } | |
525 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
526 | { | |
527 | struct lttng_kernel_event_notifier *event_notifier = | |
528 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
529 | return &event_notifier->priv->group->syscall_table; | |
530 | } | |
531 | default: | |
532 | return NULL; | |
8a8ac9a8 | 533 | } |
8a8ac9a8 | 534 | } |
0bb716a8 | 535 | |
5408b6d6 MD |
536 | static |
537 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
538 | const struct lttng_kernel_event_desc *desc, struct hlist_head *dispatch_table, | |
539 | enum sc_type type, unsigned int syscall_nr) | |
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; |
fd70f5a5 | 587 | if (dispatch_table) |
9cd106a6 | 588 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_table); |
5408b6d6 MD |
589 | break; |
590 | } | |
591 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
592 | { | |
593 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
594 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
595 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
596 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
597 | uint64_t user_token = syscall_event_enabler->user_token; | |
598 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; | |
599 | ||
600 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
601 | switch (type) { | |
602 | case SC_TYPE_ENTRY: | |
603 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
604 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
605 | break; | |
606 | case SC_TYPE_EXIT: | |
607 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
608 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
609 | break; | |
610 | case SC_TYPE_COMPAT_ENTRY: | |
611 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
612 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
613 | break; | |
614 | case SC_TYPE_COMPAT_EXIT: | |
615 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
616 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
617 | break; | |
618 | } | |
619 | strncat(event_notifier_param.event.name, desc->event_name, | |
620 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
621 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
622 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
623 | event_notifier_param.event.token = user_token; | |
624 | event_notifier_param.error_counter_index = error_counter_index; | |
625 | ||
626 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
627 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
628 | WARN_ON_ONCE(!event_notifier_enabler); | |
629 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc); | |
c3fb484e | 630 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 631 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 632 | if (IS_ERR(event)) { |
5408b6d6 MD |
633 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
634 | return; | |
635 | } | |
636 | event->priv->u.syscall.syscall_id = syscall_nr; | |
ac07db60 MD |
637 | if (dispatch_table) |
638 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_table); | |
5408b6d6 MD |
639 | break; |
640 | } | |
641 | default: | |
642 | break; | |
643 | } | |
644 | } | |
645 | ||
49c50022 | 646 | static |
67233a18 MD |
647 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
648 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 649 | { |
063f0825 MD |
650 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common); |
651 | const struct lttng_kernel_event_desc *desc; | |
259b6cb3 | 652 | unsigned int i; |
49c50022 | 653 | |
1d303f69 MD |
654 | #ifndef CONFIG_COMPAT |
655 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 656 | return; |
1d303f69 | 657 | #endif |
67233a18 | 658 | /* iterate over all syscall and create event that match */ |
49c50022 | 659 | for (i = 0; i < table_len; i++) { |
19bef247 | 660 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 661 | struct hlist_head *head; |
6768203a | 662 | bool found = false; |
49c50022 | 663 | |
063f0825 | 664 | desc = table[i].desc; |
49c50022 MD |
665 | if (!desc) { |
666 | /* Unknown syscall */ | |
667 | continue; | |
668 | } | |
063f0825 MD |
669 | |
670 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 671 | continue; |
063f0825 | 672 | |
49c50022 | 673 | /* |
3b82c4e1 | 674 | * Check if already created. |
49c50022 | 675 | */ |
0def9170 | 676 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
19bef247 | 677 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { |
6768203a MD |
678 | if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) { |
679 | found = true; | |
680 | break; | |
681 | } | |
3b82c4e1 MD |
682 | } |
683 | if (found) | |
49c50022 | 684 | continue; |
3b82c4e1 | 685 | |
ecdbbfd8 | 686 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, NULL, type, i); |
49c50022 | 687 | } |
49c50022 MD |
688 | } |
689 | ||
552f7c79 MD |
690 | static |
691 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
692 | { | |
693 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
694 | return false; | |
695 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
696 | return false; | |
697 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
698 | return false; | |
699 | if (strcmp(event_enabler->event_param.name, "*")) | |
700 | return false; | |
701 | return true; | |
702 | } | |
703 | ||
9f6f4507 MD |
704 | static |
705 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
706 | { | |
707 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
708 | struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); | |
709 | struct lttng_kernel_event_common_private *event_priv; | |
710 | const struct lttng_kernel_event_desc *desc; | |
711 | struct hlist_head *unknown_dispatch_list; | |
712 | bool found = false; | |
713 | struct hlist_head *head; | |
714 | ||
1d303f69 MD |
715 | #ifndef CONFIG_COMPAT |
716 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 717 | return; |
1d303f69 | 718 | #endif |
552f7c79 MD |
719 | /* |
720 | * Considering that currently system calls can only be enabled on a per | |
721 | * name basis (or wildcard based on a name), unknown syscall events are | |
722 | * only used when matching *all* system calls, because this is the only | |
723 | * case which can be associated with an unknown system call. | |
724 | * | |
725 | * When enabling system call on a per system call number basis will be | |
726 | * supported, this will need to be revisited. | |
727 | */ | |
728 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
729 | return; | |
730 | ||
9f6f4507 MD |
731 | switch (type) { |
732 | case SC_TYPE_ENTRY: | |
733 | desc = &__event_desc___syscall_entry_unknown; | |
734 | unknown_dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
735 | break; | |
736 | case SC_TYPE_EXIT: | |
737 | desc = &__event_desc___syscall_exit_unknown; | |
738 | unknown_dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
739 | break; | |
740 | case SC_TYPE_COMPAT_ENTRY: | |
741 | desc = &__event_desc___compat_syscall_entry_unknown; | |
742 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
743 | break; | |
744 | case SC_TYPE_COMPAT_EXIT: | |
745 | desc = &__event_desc___compat_syscall_exit_unknown; | |
746 | unknown_dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
747 | break; | |
748 | default: | |
749 | WARN_ON_ONCE(1); | |
750 | } | |
751 | ||
752 | /* | |
753 | * Check if already created. | |
754 | */ | |
755 | head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); | |
756 | lttng_hlist_for_each_entry(event_priv, head, hlist_node) { | |
6768203a | 757 | if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) { |
9f6f4507 | 758 | found = true; |
6768203a MD |
759 | break; |
760 | } | |
9f6f4507 MD |
761 | } |
762 | if (!found) | |
763 | lttng_syscall_event_enabler_create_event(event_enabler, desc, unknown_dispatch_list, type, -1U); | |
764 | } | |
765 | ||
d26015f6 | 766 | static |
15a00134 | 767 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 768 | { |
15a00134 | 769 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 770 | |
15a00134 MD |
771 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
772 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
773 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
774 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
775 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
776 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
777 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
778 | } | |
1ab4126a | 779 | |
15a00134 MD |
780 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
781 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
782 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
783 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
784 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
785 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
786 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
787 | } | |
259b6cb3 MD |
788 | } |
789 | ||
790 | /* | |
8a8ac9a8 FD |
791 | * Should be called with sessions lock held. |
792 | */ | |
b2f63bde | 793 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 794 | { |
d26015f6 MD |
795 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
796 | int ret; | |
8a8ac9a8 | 797 | |
0bb716a8 | 798 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 799 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
800 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
801 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 802 | return -ENOMEM; |
8a8ac9a8 | 803 | } |
0bb716a8 | 804 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
805 | /* create syscall table mapping syscall to events */ |
806 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 807 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 808 | return -ENOMEM; |
8a8ac9a8 FD |
809 | } |
810 | ||
811 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 812 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 813 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
814 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
815 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 816 | return -ENOMEM; |
8a8ac9a8 FD |
817 | } |
818 | ||
0bb716a8 | 819 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
820 | /* create syscall table mapping compat syscall to events */ |
821 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 822 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 823 | return -ENOMEM; |
8a8ac9a8 FD |
824 | } |
825 | #endif | |
0bb716a8 MD |
826 | if (!syscall_table->sc_filter) { |
827 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 828 | GFP_KERNEL); |
0bb716a8 | 829 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
830 | return -ENOMEM; |
831 | } | |
832 | ||
0bb716a8 | 833 | if (!syscall_table->sys_enter_registered) { |
8a8ac9a8 | 834 | ret = lttng_wrapper_tracepoint_probe_register("sys_enter", |
0bb716a8 | 835 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
836 | if (ret) |
837 | return ret; | |
0bb716a8 | 838 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 839 | } |
0bb716a8 | 840 | if (!syscall_table->sys_exit_registered) { |
8a8ac9a8 | 841 | ret = lttng_wrapper_tracepoint_probe_register("sys_exit", |
0bb716a8 | 842 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 FD |
843 | if (ret) { |
844 | WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", | |
0bb716a8 | 845 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
846 | return ret; |
847 | } | |
0bb716a8 | 848 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 849 | } |
0fab709d | 850 | |
86e12a51 MD |
851 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
852 | ||
8a8ac9a8 FD |
853 | return ret; |
854 | } | |
855 | ||
6053e75e | 856 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
857 | { |
858 | int ret; | |
859 | ||
0bb716a8 | 860 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 861 | return 0; |
0bb716a8 | 862 | if (syscall_table->sys_enter_registered) { |
2d9cd7f3 | 863 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 864 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
865 | if (ret) |
866 | return ret; | |
0bb716a8 | 867 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 868 | } |
0bb716a8 | 869 | if (syscall_table->sys_exit_registered) { |
2d9cd7f3 | 870 | ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 871 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
872 | if (ret) |
873 | return ret; | |
0bb716a8 | 874 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 875 | } |
badfe9f5 MD |
876 | return 0; |
877 | } | |
878 | ||
6053e75e | 879 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 880 | { |
0bb716a8 MD |
881 | kfree(syscall_table->syscall_dispatch); |
882 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 883 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
884 | kfree(syscall_table->compat_syscall_dispatch); |
885 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 886 | #endif |
0bb716a8 | 887 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
888 | return 0; |
889 | } | |
890 | ||
891 | static | |
892 | int get_syscall_nr(const char *syscall_name) | |
893 | { | |
894 | int syscall_nr = -1; | |
895 | int i; | |
896 | ||
ebcc64cd | 897 | for (i = 0; i < sc_table.len; i++) { |
80f87dd2 | 898 | const struct trace_syscall_entry *entry; |
5b7ac358 | 899 | const char *it_name; |
80f87dd2 | 900 | |
ebcc64cd | 901 | entry = &sc_table.table[i]; |
80f87dd2 MD |
902 | if (!entry->desc) |
903 | continue; | |
437d5aa5 | 904 | it_name = entry->desc->event_name; |
5b7ac358 MD |
905 | it_name += strlen(SYSCALL_ENTRY_STR); |
906 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
907 | syscall_nr = i; |
908 | break; | |
909 | } | |
910 | } | |
911 | return syscall_nr; | |
912 | } | |
913 | ||
914 | static | |
915 | int get_compat_syscall_nr(const char *syscall_name) | |
916 | { | |
917 | int syscall_nr = -1; | |
918 | int i; | |
919 | ||
ebcc64cd | 920 | for (i = 0; i < compat_sc_table.len; i++) { |
80f87dd2 | 921 | const struct trace_syscall_entry *entry; |
5b7ac358 | 922 | const char *it_name; |
80f87dd2 | 923 | |
ebcc64cd | 924 | entry = &compat_sc_table.table[i]; |
80f87dd2 MD |
925 | if (!entry->desc) |
926 | continue; | |
437d5aa5 | 927 | it_name = entry->desc->event_name; |
5b7ac358 MD |
928 | it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); |
929 | if (!strcmp(syscall_name, it_name)) { | |
80f87dd2 MD |
930 | syscall_nr = i; |
931 | break; | |
932 | } | |
933 | } | |
934 | return syscall_nr; | |
935 | } | |
936 | ||
12e579db MD |
937 | static |
938 | uint32_t get_sc_tables_len(void) | |
939 | { | |
ebcc64cd | 940 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
941 | } |
942 | ||
badfe9f5 | 943 | static |
ade8a729 FD |
944 | const char *get_syscall_name(const char *desc_name, |
945 | enum lttng_syscall_abi abi, | |
946 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 947 | { |
badfe9f5 | 948 | size_t prefix_len = 0; |
80f87dd2 | 949 | |
80f87dd2 | 950 | |
ade8a729 | 951 | switch (entryexit) { |
badfe9f5 | 952 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 953 | switch (abi) { |
badfe9f5 MD |
954 | case LTTNG_SYSCALL_ABI_NATIVE: |
955 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
956 | break; | |
957 | case LTTNG_SYSCALL_ABI_COMPAT: | |
958 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
959 | break; | |
80f87dd2 | 960 | } |
badfe9f5 MD |
961 | break; |
962 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 963 | switch (abi) { |
badfe9f5 MD |
964 | case LTTNG_SYSCALL_ABI_NATIVE: |
965 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
966 | break; | |
967 | case LTTNG_SYSCALL_ABI_COMPAT: | |
968 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
969 | break; | |
80f87dd2 | 970 | } |
badfe9f5 | 971 | break; |
80f87dd2 | 972 | } |
badfe9f5 | 973 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 974 | return desc_name + prefix_len; |
badfe9f5 MD |
975 | } |
976 | ||
ade8a729 FD |
977 | static |
978 | int lttng_syscall_filter_enable( | |
979 | struct lttng_syscall_filter *filter, | |
980 | const char *desc_name, enum lttng_syscall_abi abi, | |
981 | enum lttng_syscall_entryexit entryexit) | |
badfe9f5 | 982 | { |
badfe9f5 MD |
983 | const char *syscall_name; |
984 | unsigned long *bitmap; | |
7f52f0d4 | 985 | u32 *refcount_map; |
badfe9f5 MD |
986 | int syscall_nr; |
987 | ||
ade8a729 | 988 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 989 | |
ade8a729 | 990 | switch (abi) { |
badfe9f5 MD |
991 | case LTTNG_SYSCALL_ABI_NATIVE: |
992 | syscall_nr = get_syscall_nr(syscall_name); | |
993 | break; | |
994 | case LTTNG_SYSCALL_ABI_COMPAT: | |
995 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
996 | break; | |
997 | default: | |
998 | return -EINVAL; | |
80f87dd2 | 999 | } |
badfe9f5 MD |
1000 | if (syscall_nr < 0) |
1001 | return -ENOENT; | |
1002 | ||
ade8a729 | 1003 | switch (entryexit) { |
badfe9f5 | 1004 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1005 | switch (abi) { |
badfe9f5 MD |
1006 | case LTTNG_SYSCALL_ABI_NATIVE: |
1007 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1008 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1009 | break; |
1010 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1011 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1012 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1013 | break; |
6d9694d8 MD |
1014 | default: |
1015 | return -EINVAL; | |
80f87dd2 | 1016 | } |
badfe9f5 MD |
1017 | break; |
1018 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1019 | switch (abi) { |
badfe9f5 MD |
1020 | case LTTNG_SYSCALL_ABI_NATIVE: |
1021 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1022 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1023 | break; |
1024 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1025 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1026 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1027 | break; |
6d9694d8 MD |
1028 | default: |
1029 | return -EINVAL; | |
80f87dd2 | 1030 | } |
badfe9f5 MD |
1031 | break; |
1032 | default: | |
1033 | return -EINVAL; | |
80f87dd2 | 1034 | } |
7f52f0d4 MD |
1035 | if (refcount_map[syscall_nr] == U32_MAX) |
1036 | return -EOVERFLOW; | |
1037 | if (refcount_map[syscall_nr]++ == 0) | |
1038 | bitmap_set(bitmap, syscall_nr, 1); | |
80f87dd2 | 1039 | return 0; |
80f87dd2 MD |
1040 | } |
1041 | ||
9b2f1c54 | 1042 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1043 | { |
9b2f1c54 | 1044 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
1045 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
1046 | struct hlist_head *dispatch_list; | |
9b2f1c54 | 1047 | int ret; |
8a8ac9a8 | 1048 | |
9b2f1c54 | 1049 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1050 | |
7f52f0d4 MD |
1051 | /* Skip unknown syscall */ |
1052 | if (syscall_id == -1U) | |
1053 | return 0; | |
1054 | ||
0bb716a8 | 1055 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, |
9b2f1c54 MD |
1056 | event->priv->desc->event_name, event->priv->u.syscall.abi, |
1057 | event->priv->u.syscall.entryexit); | |
1058 | if (ret) | |
1059 | return ret; | |
8a8ac9a8 | 1060 | |
9cd106a6 MD |
1061 | switch (event->priv->u.syscall.entryexit) { |
1062 | case LTTNG_SYSCALL_ENTRY: | |
1063 | switch (event->priv->u.syscall.abi) { | |
1064 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1065 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1066 | break; | |
1067 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1068 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1069 | break; | |
1070 | default: | |
1071 | ret = -EINVAL; | |
1072 | goto end; | |
1073 | } | |
8a8ac9a8 | 1074 | break; |
9cd106a6 MD |
1075 | case LTTNG_SYSCALL_EXIT: |
1076 | switch (event->priv->u.syscall.abi) { | |
1077 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1078 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
8a8ac9a8 | 1079 | break; |
9cd106a6 MD |
1080 | case LTTNG_SYSCALL_ABI_COMPAT: |
1081 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
8a8ac9a8 | 1082 | break; |
6866b1c7 MJ |
1083 | default: |
1084 | ret = -EINVAL; | |
1085 | goto end; | |
8a8ac9a8 FD |
1086 | } |
1087 | break; | |
6866b1c7 | 1088 | default: |
9cd106a6 MD |
1089 | ret = -EINVAL; |
1090 | goto end; | |
8a8ac9a8 | 1091 | } |
9cd106a6 MD |
1092 | |
1093 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1094 | end: |
9b2f1c54 | 1095 | return ret; |
ade8a729 FD |
1096 | } |
1097 | ||
1098 | static | |
f2db8be3 | 1099 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 FD |
1100 | const char *desc_name, enum lttng_syscall_abi abi, |
1101 | enum lttng_syscall_entryexit entryexit) | |
1102 | { | |
badfe9f5 MD |
1103 | const char *syscall_name; |
1104 | unsigned long *bitmap; | |
7f52f0d4 | 1105 | u32 *refcount_map; |
badfe9f5 | 1106 | int syscall_nr; |
80f87dd2 | 1107 | |
ade8a729 | 1108 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1109 | |
ade8a729 | 1110 | switch (abi) { |
badfe9f5 MD |
1111 | case LTTNG_SYSCALL_ABI_NATIVE: |
1112 | syscall_nr = get_syscall_nr(syscall_name); | |
1113 | break; | |
1114 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1115 | syscall_nr = get_compat_syscall_nr(syscall_name); | |
1116 | break; | |
1117 | default: | |
1118 | return -EINVAL; | |
80f87dd2 | 1119 | } |
badfe9f5 MD |
1120 | if (syscall_nr < 0) |
1121 | return -ENOENT; | |
80f87dd2 | 1122 | |
ade8a729 | 1123 | switch (entryexit) { |
badfe9f5 | 1124 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1125 | switch (abi) { |
badfe9f5 MD |
1126 | case LTTNG_SYSCALL_ABI_NATIVE: |
1127 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1128 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1129 | break; |
1130 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1131 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1132 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1133 | break; |
6d9694d8 MD |
1134 | default: |
1135 | return -EINVAL; | |
80f87dd2 | 1136 | } |
badfe9f5 MD |
1137 | break; |
1138 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1139 | switch (abi) { |
badfe9f5 MD |
1140 | case LTTNG_SYSCALL_ABI_NATIVE: |
1141 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1142 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1143 | break; |
1144 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1145 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1146 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1147 | break; |
6d9694d8 MD |
1148 | default: |
1149 | return -EINVAL; | |
80f87dd2 | 1150 | } |
badfe9f5 MD |
1151 | break; |
1152 | default: | |
1153 | return -EINVAL; | |
80f87dd2 | 1154 | } |
7f52f0d4 MD |
1155 | if (refcount_map[syscall_nr] == 0) |
1156 | return -ENOENT; | |
1157 | if (--refcount_map[syscall_nr] == 0) | |
1158 | bitmap_clear(bitmap, syscall_nr, 1); | |
badfe9f5 | 1159 | return 0; |
259b6cb3 | 1160 | } |
2d2464bd | 1161 | |
9b2f1c54 | 1162 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1163 | { |
9b2f1c54 | 1164 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
7f52f0d4 | 1165 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
8a8ac9a8 FD |
1166 | int ret; |
1167 | ||
7f52f0d4 MD |
1168 | /* Skip unknown syscall */ |
1169 | if (syscall_id == -1U) | |
1170 | return 0; | |
1171 | ||
0bb716a8 | 1172 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, |
9b2f1c54 MD |
1173 | event->priv->desc->event_name, event->priv->u.syscall.abi, |
1174 | event->priv->u.syscall.entryexit); | |
1175 | if (ret) | |
1176 | return ret; | |
9cd106a6 | 1177 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1178 | return 0; |
1179 | } | |
1180 | ||
9cb5be7e MD |
1181 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1182 | { | |
1183 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1184 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1185 | int enabled = event_enabler->enabled; | |
1186 | ||
552f7c79 | 1187 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1188 | return; |
9cb5be7e MD |
1189 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1190 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1191 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1192 | ||
1193 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1194 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1195 | } | |
1196 | ||
2d2464bd MD |
1197 | static |
1198 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1199 | { | |
1200 | const struct trace_syscall_entry *entry; | |
1201 | int iter = 0; | |
1202 | ||
ebcc64cd FD |
1203 | for (entry = sc_table.table; |
1204 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1205 | entry++) { |
1206 | if (iter++ >= *pos) | |
1207 | return entry; | |
1208 | } | |
ebcc64cd FD |
1209 | for (entry = compat_sc_table.table; |
1210 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1211 | entry++) { |
1212 | if (iter++ >= *pos) | |
1213 | return entry; | |
1214 | } | |
1215 | /* End of list */ | |
1216 | return NULL; | |
1217 | } | |
1218 | ||
1219 | static | |
1220 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1221 | { | |
1222 | return (void *) syscall_list_get_entry(pos); | |
1223 | } | |
1224 | ||
1225 | static | |
1226 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1227 | { | |
1228 | (*ppos)++; | |
1229 | return (void *) syscall_list_get_entry(ppos); | |
1230 | } | |
1231 | ||
1232 | static | |
1233 | void syscall_list_stop(struct seq_file *m, void *p) | |
1234 | { | |
1235 | } | |
1236 | ||
12e579db MD |
1237 | static |
1238 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1239 | const struct trace_syscall_entry **table, | |
1240 | unsigned int *bitness) | |
1241 | { | |
ebcc64cd | 1242 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1243 | if (bitness) |
1244 | *bitness = BITS_PER_LONG; | |
1245 | if (table) | |
ebcc64cd | 1246 | *table = sc_table.table; |
12e579db MD |
1247 | return 0; |
1248 | } | |
ebcc64cd FD |
1249 | if (!(entry >= compat_sc_table.table |
1250 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1251 | return -EINVAL; |
1252 | } | |
1253 | if (bitness) | |
1254 | *bitness = 32; | |
1255 | if (table) | |
ebcc64cd | 1256 | *table = compat_sc_table.table; |
12e579db MD |
1257 | return 0; |
1258 | } | |
1259 | ||
2d2464bd MD |
1260 | static |
1261 | int syscall_list_show(struct seq_file *m, void *p) | |
1262 | { | |
1263 | const struct trace_syscall_entry *table, *entry = p; | |
1264 | unsigned int bitness; | |
d4291869 | 1265 | unsigned long index; |
12e579db | 1266 | int ret; |
d4291869 | 1267 | const char *name; |
2d2464bd | 1268 | |
12e579db MD |
1269 | ret = get_sc_table(entry, &table, &bitness); |
1270 | if (ret) | |
1271 | return ret; | |
f4855b46 MD |
1272 | if (!entry->desc) |
1273 | return 0; | |
ebcc64cd | 1274 | if (table == sc_table.table) { |
d4291869 | 1275 | index = entry - table; |
437d5aa5 | 1276 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1277 | } else { |
ebcc64cd | 1278 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1279 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1280 | } |
12e579db | 1281 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1282 | index, name, bitness); |
2d2464bd MD |
1283 | return 0; |
1284 | } | |
1285 | ||
1286 | static | |
1287 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1288 | .start = syscall_list_start, | |
1289 | .next = syscall_list_next, | |
1290 | .stop = syscall_list_stop, | |
1291 | .show = syscall_list_show, | |
1292 | }; | |
1293 | ||
1294 | static | |
1295 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1296 | { | |
1297 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1298 | } | |
1299 | ||
1300 | const struct file_operations lttng_syscall_list_fops = { | |
1301 | .owner = THIS_MODULE, | |
1302 | .open = lttng_syscall_list_open, | |
1303 | .read = seq_read, | |
1304 | .llseek = seq_lseek, | |
1305 | .release = seq_release, | |
1306 | }; | |
12e579db | 1307 | |
badfe9f5 MD |
1308 | /* |
1309 | * A syscall is enabled if it is traced for either entry or exit. | |
1310 | */ | |
c970b655 | 1311 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1312 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1313 | { |
1314 | uint32_t len, sc_tables_len, bitmask_len; | |
1315 | int ret = 0, bit; | |
1316 | char *tmp_mask; | |
1317 | struct lttng_syscall_filter *filter; | |
1318 | ||
1319 | ret = get_user(len, &usyscall_mask->len); | |
1320 | if (ret) | |
1321 | return ret; | |
1322 | sc_tables_len = get_sc_tables_len(); | |
1323 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1324 | if (len < sc_tables_len) { | |
1325 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1326 | } | |
1327 | /* Array is large enough, we can copy array to user-space. */ | |
1328 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1329 | if (!tmp_mask) | |
1330 | return -ENOMEM; | |
0bb716a8 | 1331 | filter = syscall_table->sc_filter; |
12e579db | 1332 | |
ebcc64cd | 1333 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1334 | char state; |
2f25059d | 1335 | |
0bb716a8 MD |
1336 | if (syscall_table->syscall_dispatch) { |
1337 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1338 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1339 | state = test_bit(bit, filter->sc_entry) |
1340 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1341 | else |
1342 | state = 1; | |
1343 | } else { | |
1344 | state = 0; | |
1345 | } | |
1346 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1347 | } |
1348 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1349 | char state; |
2f25059d | 1350 | |
0bb716a8 MD |
1351 | if (syscall_table->compat_syscall_dispatch) { |
1352 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1353 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1354 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1355 | filter->sc_compat_entry) |
ebcc64cd | 1356 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1357 | filter->sc_compat_exit); |
2f25059d MD |
1358 | else |
1359 | state = 1; | |
1360 | } else { | |
1361 | state = 0; | |
1362 | } | |
1363 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1364 | } |
1365 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1366 | ret = -EFAULT; | |
1367 | kfree(tmp_mask); | |
1368 | return ret; | |
1369 | } | |
082d4946 MD |
1370 | |
1371 | int lttng_abi_syscall_list(void) | |
1372 | { | |
1373 | struct file *syscall_list_file; | |
1374 | int file_fd, ret; | |
1375 | ||
4ac10b76 | 1376 | file_fd = lttng_get_unused_fd(); |
082d4946 MD |
1377 | if (file_fd < 0) { |
1378 | ret = file_fd; | |
1379 | goto fd_error; | |
1380 | } | |
1381 | ||
1382 | syscall_list_file = anon_inode_getfile("[lttng_syscall_list]", | |
1383 | <tng_syscall_list_fops, | |
1384 | NULL, O_RDWR); | |
1385 | if (IS_ERR(syscall_list_file)) { | |
1386 | ret = PTR_ERR(syscall_list_file); | |
1387 | goto file_error; | |
1388 | } | |
1389 | ret = lttng_syscall_list_fops.open(NULL, syscall_list_file); | |
1390 | if (ret < 0) | |
1391 | goto open_error; | |
1392 | fd_install(file_fd, syscall_list_file); | |
082d4946 MD |
1393 | return file_fd; |
1394 | ||
1395 | open_error: | |
1396 | fput(syscall_list_file); | |
1397 | file_error: | |
1398 | put_unused_fd(file_fd); | |
1399 | fd_error: | |
1400 | return ret; | |
1401 | } |