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 |
b03cf820 | 88 | #define TRACE_INCLUDE_PATH instrumentation/syscalls |
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 |
b03cf820 | 95 | #include <instrumentation/syscalls/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: | |
48c210a7 MD |
495 | lttng_fallthrough; |
496 | case LTTNG_EVENT_ENABLER_TYPE_COUNTER: | |
0bb716a8 | 497 | { |
48c210a7 MD |
498 | struct lttng_event_enabler_session_common *event_enabler_session = |
499 | container_of(event_enabler, struct lttng_event_enabler_session_common, parent); | |
500 | return &event_enabler_session->chan->priv->syscall_table; | |
8a8ac9a8 | 501 | } |
0bb716a8 MD |
502 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: |
503 | { | |
504 | struct lttng_event_notifier_enabler *event_notifier_enabler = | |
505 | container_of(event_enabler, struct lttng_event_notifier_enabler, parent); | |
506 | return &event_notifier_enabler->group->syscall_table; | |
8a8ac9a8 | 507 | } |
0bb716a8 MD |
508 | default: |
509 | return NULL; | |
8a8ac9a8 | 510 | } |
0bb716a8 | 511 | } |
8a8ac9a8 | 512 | |
0bb716a8 MD |
513 | static |
514 | struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event) | |
515 | { | |
516 | switch (event->type) { | |
517 | case LTTNG_KERNEL_EVENT_TYPE_RECORDER: | |
48c210a7 MD |
518 | lttng_fallthrough; |
519 | case LTTNG_KERNEL_EVENT_TYPE_COUNTER: | |
0bb716a8 | 520 | { |
48c210a7 MD |
521 | struct lttng_kernel_event_common_private *event_priv = event->priv; |
522 | struct lttng_kernel_event_session_common_private *event_session_priv = | |
523 | container_of(event_priv, struct lttng_kernel_event_session_common_private, parent); | |
524 | return &event_session_priv->chan->priv->syscall_table; | |
0bb716a8 MD |
525 | } |
526 | case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER: | |
527 | { | |
528 | struct lttng_kernel_event_notifier *event_notifier = | |
529 | container_of(event, struct lttng_kernel_event_notifier, parent); | |
530 | return &event_notifier->priv->group->syscall_table; | |
531 | } | |
532 | default: | |
533 | return NULL; | |
8a8ac9a8 | 534 | } |
8a8ac9a8 | 535 | } |
0bb716a8 | 536 | |
5408b6d6 MD |
537 | static |
538 | void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common *syscall_event_enabler, | |
99903379 | 539 | const struct lttng_kernel_event_desc *desc, enum sc_type type, unsigned int syscall_nr) |
5408b6d6 MD |
540 | { |
541 | struct lttng_kernel_event_common *event; | |
542 | ||
543 | switch (syscall_event_enabler->enabler_type) { | |
544 | case LTTNG_EVENT_ENABLER_TYPE_RECORDER: | |
545 | { | |
546 | struct lttng_event_recorder_enabler *syscall_event_recorder_enabler = | |
4a46ca39 | 547 | container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent.parent); |
5408b6d6 MD |
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; | |
6ef1e2f5 | 574 | ev.token = syscall_event_enabler->user_token; |
5408b6d6 MD |
575 | event_recorder_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, |
576 | syscall_event_recorder_enabler->chan); | |
577 | WARN_ON_ONCE(!event_recorder_enabler); | |
578 | if (!event_recorder_enabler) | |
579 | return; | |
44d1600b | 580 | event = _lttng_kernel_event_create(&event_recorder_enabler->parent.parent, desc, NULL); |
c3fb484e | 581 | WARN_ON_ONCE(IS_ERR(event)); |
4a46ca39 | 582 | lttng_event_enabler_destroy(&event_recorder_enabler->parent.parent); |
c3fb484e | 583 | if (IS_ERR(event)) { |
5408b6d6 MD |
584 | printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name); |
585 | return; | |
586 | } | |
9cd106a6 | 587 | event->priv->u.syscall.syscall_id = syscall_nr; |
5408b6d6 MD |
588 | break; |
589 | } | |
590 | case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER: | |
591 | { | |
592 | struct lttng_event_notifier_enabler *syscall_event_notifier_enabler = | |
593 | container_of(syscall_event_enabler, struct lttng_event_notifier_enabler, parent); | |
594 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
595 | struct lttng_kernel_abi_event_notifier event_notifier_param; | |
5408b6d6 MD |
596 | uint64_t error_counter_index = syscall_event_notifier_enabler->error_counter_index; |
597 | ||
598 | memset(&event_notifier_param, 0, sizeof(event_notifier_param)); | |
599 | switch (type) { | |
600 | case SC_TYPE_ENTRY: | |
601 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
602 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
603 | break; | |
604 | case SC_TYPE_EXIT: | |
605 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
606 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
607 | break; | |
608 | case SC_TYPE_COMPAT_ENTRY: | |
609 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
610 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
611 | break; | |
612 | case SC_TYPE_COMPAT_EXIT: | |
613 | event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
614 | event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
615 | break; | |
616 | } | |
617 | strncat(event_notifier_param.event.name, desc->event_name, | |
618 | LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1); | |
619 | event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
620 | event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
6ef1e2f5 | 621 | event_notifier_param.event.token = syscall_event_enabler->user_token; |
5408b6d6 MD |
622 | event_notifier_param.error_counter_index = error_counter_index; |
623 | ||
624 | event_notifier_enabler = lttng_event_notifier_enabler_create(LTTNG_ENABLER_FORMAT_NAME, | |
625 | &event_notifier_param, syscall_event_notifier_enabler->group); | |
626 | WARN_ON_ONCE(!event_notifier_enabler); | |
44d1600b | 627 | event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc, NULL); |
c3fb484e | 628 | WARN_ON_ONCE(IS_ERR(event)); |
5408b6d6 | 629 | lttng_event_enabler_destroy(&event_notifier_enabler->parent); |
c3fb484e | 630 | if (IS_ERR(event)) { |
5408b6d6 MD |
631 | printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name); |
632 | return; | |
633 | } | |
634 | event->priv->u.syscall.syscall_id = syscall_nr; | |
635 | break; | |
6ef1e2f5 MD |
636 | case LTTNG_EVENT_ENABLER_TYPE_COUNTER: |
637 | { | |
638 | struct lttng_event_counter_enabler *syscall_event_counter_enabler = | |
639 | container_of(syscall_event_enabler, struct lttng_event_counter_enabler, parent.parent); | |
640 | struct lttng_event_counter_enabler *event_counter_enabler; | |
641 | struct lttng_kernel_abi_event ev; | |
642 | ||
643 | /* We need to create an event for this syscall/enabler. */ | |
644 | memset(&ev, 0, sizeof(ev)); | |
645 | switch (type) { | |
646 | case SC_TYPE_ENTRY: | |
647 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
648 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
649 | break; | |
650 | case SC_TYPE_EXIT: | |
651 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
652 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; | |
653 | break; | |
654 | case SC_TYPE_COMPAT_ENTRY: | |
655 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; | |
656 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
657 | break; | |
658 | case SC_TYPE_COMPAT_EXIT: | |
659 | ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; | |
660 | ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; | |
661 | break; | |
662 | } | |
663 | strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1); | |
664 | ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; | |
665 | ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; | |
666 | ev.token = syscall_event_enabler->user_token; | |
667 | event_counter_enabler = lttng_event_counter_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, | |
7b0f1e69 | 668 | syscall_event_counter_enabler->key, syscall_event_counter_enabler->chan); |
6ef1e2f5 MD |
669 | WARN_ON_ONCE(!event_counter_enabler); |
670 | if (!event_counter_enabler) | |
671 | return; | |
44d1600b | 672 | event = _lttng_kernel_event_create(&event_counter_enabler->parent.parent, desc, NULL); |
6ef1e2f5 MD |
673 | lttng_event_enabler_destroy(&event_counter_enabler->parent.parent); |
674 | if (IS_ERR(event)) { | |
675 | if (PTR_ERR(event) != -EEXIST) | |
676 | printk(KERN_INFO "Unable to create event counter %s\n", desc->event_name); | |
677 | return; | |
678 | } | |
679 | event->priv->u.syscall.syscall_id = syscall_nr; | |
680 | break; | |
681 | } | |
682 | ||
5408b6d6 MD |
683 | } |
684 | default: | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
49c50022 | 689 | static |
67233a18 MD |
690 | void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common, |
691 | const struct trace_syscall_entry *table, size_t table_len, enum sc_type type) | |
259b6cb3 | 692 | { |
49b1a300 | 693 | struct lttng_event_ht *events_name_ht = lttng_get_events_name_ht_from_enabler(syscall_event_enabler_common); |
063f0825 | 694 | const struct lttng_kernel_event_desc *desc; |
259b6cb3 | 695 | unsigned int i; |
49c50022 | 696 | |
1d303f69 MD |
697 | #ifndef CONFIG_COMPAT |
698 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 699 | return; |
1d303f69 | 700 | #endif |
67233a18 | 701 | /* iterate over all syscall and create event that match */ |
49c50022 | 702 | for (i = 0; i < table_len; i++) { |
7b0f1e69 | 703 | char key_string[LTTNG_KERNEL_COUNTER_KEY_LEN] = { 0 }; |
19bef247 | 704 | struct lttng_kernel_event_common_private *event_priv; |
3b82c4e1 | 705 | struct hlist_head *head; |
6768203a | 706 | bool found = false; |
49c50022 | 707 | |
063f0825 | 708 | desc = table[i].desc; |
49c50022 MD |
709 | if (!desc) { |
710 | /* Unknown syscall */ | |
711 | continue; | |
712 | } | |
063f0825 MD |
713 | |
714 | if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) | |
3b82c4e1 | 715 | continue; |
063f0825 | 716 | |
d9f47662 MD |
717 | if (format_event_key(syscall_event_enabler_common, key_string, desc->event_name)) |
718 | continue; | |
719 | ||
49c50022 | 720 | /* |
3b82c4e1 | 721 | * Check if already created. |
49c50022 | 722 | */ |
49b1a300 MD |
723 | head = utils_borrow_hash_table_bucket(events_name_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
724 | lttng_hlist_for_each_entry(event_priv, head, hlist_name_node) { | |
d9f47662 | 725 | if (lttng_event_enabler_event_name_key_match_event(syscall_event_enabler_common, desc->event_name, key_string, event_priv->pub)) { |
6768203a MD |
726 | found = true; |
727 | break; | |
728 | } | |
3b82c4e1 MD |
729 | } |
730 | if (found) | |
49c50022 | 731 | continue; |
3b82c4e1 | 732 | |
99903379 | 733 | lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, type, i); |
49c50022 | 734 | } |
49c50022 MD |
735 | } |
736 | ||
552f7c79 MD |
737 | static |
738 | bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) | |
739 | { | |
740 | if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) | |
741 | return false; | |
742 | if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) | |
743 | return false; | |
744 | if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) | |
745 | return false; | |
746 | if (strcmp(event_enabler->event_param.name, "*")) | |
747 | return false; | |
748 | return true; | |
749 | } | |
750 | ||
9f6f4507 MD |
751 | static |
752 | void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) | |
753 | { | |
7b0f1e69 | 754 | char key_string[LTTNG_KERNEL_COUNTER_KEY_LEN] = { 0 }; |
49b1a300 | 755 | struct lttng_event_ht *events_name_ht = lttng_get_events_name_ht_from_enabler(event_enabler); |
9f6f4507 MD |
756 | struct lttng_kernel_event_common_private *event_priv; |
757 | const struct lttng_kernel_event_desc *desc; | |
9f6f4507 MD |
758 | bool found = false; |
759 | struct hlist_head *head; | |
760 | ||
1d303f69 MD |
761 | #ifndef CONFIG_COMPAT |
762 | if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT) | |
1ab4126a | 763 | return; |
1d303f69 | 764 | #endif |
552f7c79 MD |
765 | /* |
766 | * Considering that currently system calls can only be enabled on a per | |
767 | * name basis (or wildcard based on a name), unknown syscall events are | |
768 | * only used when matching *all* system calls, because this is the only | |
769 | * case which can be associated with an unknown system call. | |
770 | * | |
771 | * When enabling system call on a per system call number basis will be | |
772 | * supported, this will need to be revisited. | |
773 | */ | |
774 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) | |
775 | return; | |
776 | ||
9f6f4507 MD |
777 | switch (type) { |
778 | case SC_TYPE_ENTRY: | |
779 | desc = &__event_desc___syscall_entry_unknown; | |
9f6f4507 MD |
780 | break; |
781 | case SC_TYPE_EXIT: | |
782 | desc = &__event_desc___syscall_exit_unknown; | |
9f6f4507 MD |
783 | break; |
784 | case SC_TYPE_COMPAT_ENTRY: | |
785 | desc = &__event_desc___compat_syscall_entry_unknown; | |
9f6f4507 MD |
786 | break; |
787 | case SC_TYPE_COMPAT_EXIT: | |
788 | desc = &__event_desc___compat_syscall_exit_unknown; | |
9f6f4507 MD |
789 | break; |
790 | default: | |
791 | WARN_ON_ONCE(1); | |
792 | } | |
793 | ||
d9f47662 MD |
794 | if (format_event_key(event_enabler, key_string, desc->event_name)) |
795 | return; | |
796 | ||
9f6f4507 MD |
797 | /* |
798 | * Check if already created. | |
799 | */ | |
49b1a300 MD |
800 | head = utils_borrow_hash_table_bucket(events_name_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name); |
801 | lttng_hlist_for_each_entry(event_priv, head, hlist_name_node) { | |
d9f47662 | 802 | if (lttng_event_enabler_event_name_key_match_event(event_enabler, desc->event_name, key_string, event_priv->pub)) { |
9f6f4507 | 803 | found = true; |
6768203a MD |
804 | break; |
805 | } | |
9f6f4507 MD |
806 | } |
807 | if (!found) | |
99903379 | 808 | lttng_syscall_event_enabler_create_event(event_enabler, desc, type, -1U); |
9f6f4507 MD |
809 | } |
810 | ||
d26015f6 | 811 | static |
15a00134 | 812 | void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler) |
49c50022 | 813 | { |
15a00134 | 814 | enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit; |
5b7ac358 | 815 | |
15a00134 MD |
816 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
817 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
818 | sc_table.table, sc_table.len, SC_TYPE_ENTRY); | |
819 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
820 | compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY); | |
821 | create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY); | |
822 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY); | |
823 | } | |
1ab4126a | 824 | |
15a00134 MD |
825 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { |
826 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
827 | sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT); | |
828 | lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler, | |
829 | compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT); | |
830 | create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT); | |
831 | create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT); | |
832 | } | |
259b6cb3 MD |
833 | } |
834 | ||
835 | /* | |
8a8ac9a8 FD |
836 | * Should be called with sessions lock held. |
837 | */ | |
b2f63bde | 838 | int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enabler_common *syscall_event_enabler) |
8a8ac9a8 | 839 | { |
d26015f6 MD |
840 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); |
841 | int ret; | |
8a8ac9a8 | 842 | |
0bb716a8 | 843 | if (!syscall_table->syscall_dispatch) { |
d26015f6 | 844 | /* create syscall table mapping syscall to events */ |
0bb716a8 MD |
845 | syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL); |
846 | if (!syscall_table->syscall_dispatch) | |
8a8ac9a8 | 847 | return -ENOMEM; |
8a8ac9a8 | 848 | } |
0bb716a8 | 849 | if (!syscall_table->syscall_exit_dispatch) { |
d26015f6 MD |
850 | /* create syscall table mapping syscall to events */ |
851 | syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 852 | if (!syscall_table->syscall_exit_dispatch) |
8a8ac9a8 | 853 | return -ENOMEM; |
8a8ac9a8 FD |
854 | } |
855 | ||
856 | #ifdef CONFIG_COMPAT | |
0bb716a8 | 857 | if (!syscall_table->compat_syscall_dispatch) { |
d26015f6 | 858 | /* create syscall table mapping compat syscall to events */ |
0bb716a8 MD |
859 | syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL); |
860 | if (!syscall_table->compat_syscall_dispatch) | |
8a8ac9a8 | 861 | return -ENOMEM; |
8a8ac9a8 FD |
862 | } |
863 | ||
0bb716a8 | 864 | if (!syscall_table->compat_syscall_exit_dispatch) { |
d26015f6 MD |
865 | /* create syscall table mapping compat syscall to events */ |
866 | syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL); | |
0bb716a8 | 867 | if (!syscall_table->compat_syscall_exit_dispatch) |
8a8ac9a8 | 868 | return -ENOMEM; |
8a8ac9a8 FD |
869 | } |
870 | #endif | |
0bb716a8 MD |
871 | if (!syscall_table->sc_filter) { |
872 | syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter), | |
8a8ac9a8 | 873 | GFP_KERNEL); |
0bb716a8 | 874 | if (!syscall_table->sc_filter) |
8a8ac9a8 FD |
875 | return -ENOMEM; |
876 | } | |
877 | ||
0bb716a8 | 878 | if (!syscall_table->sys_enter_registered) { |
a6837bed | 879 | ret = lttng_tracepoint_probe_register("sys_enter", |
0bb716a8 | 880 | (void *) syscall_entry_event_probe, syscall_table); |
8a8ac9a8 FD |
881 | if (ret) |
882 | return ret; | |
0bb716a8 | 883 | syscall_table->sys_enter_registered = 1; |
8a8ac9a8 | 884 | } |
0bb716a8 | 885 | if (!syscall_table->sys_exit_registered) { |
a6837bed | 886 | ret = lttng_tracepoint_probe_register("sys_exit", |
0bb716a8 | 887 | (void *) syscall_exit_event_probe, syscall_table); |
8a8ac9a8 | 888 | if (ret) { |
a6837bed | 889 | WARN_ON_ONCE(lttng_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 890 | (void *) syscall_entry_event_probe, syscall_table)); |
8a8ac9a8 FD |
891 | return ret; |
892 | } | |
0bb716a8 | 893 | syscall_table->sys_exit_registered = 1; |
8a8ac9a8 | 894 | } |
0fab709d | 895 | |
86e12a51 MD |
896 | lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler); |
897 | ||
fad51c94 | 898 | return 0; |
8a8ac9a8 FD |
899 | } |
900 | ||
6053e75e | 901 | int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
259b6cb3 MD |
902 | { |
903 | int ret; | |
904 | ||
0bb716a8 | 905 | if (!syscall_table->syscall_dispatch) |
259b6cb3 | 906 | return 0; |
0bb716a8 | 907 | if (syscall_table->sys_enter_registered) { |
a6837bed | 908 | ret = lttng_tracepoint_probe_unregister("sys_enter", |
0bb716a8 | 909 | (void *) syscall_entry_event_probe, syscall_table); |
80f87dd2 MD |
910 | if (ret) |
911 | return ret; | |
0bb716a8 | 912 | syscall_table->sys_enter_registered = 0; |
80f87dd2 | 913 | } |
0bb716a8 | 914 | if (syscall_table->sys_exit_registered) { |
a6837bed | 915 | ret = lttng_tracepoint_probe_unregister("sys_exit", |
0bb716a8 | 916 | (void *) syscall_exit_event_probe, syscall_table); |
80f87dd2 MD |
917 | if (ret) |
918 | return ret; | |
0bb716a8 | 919 | syscall_table->sys_exit_registered = 0; |
80f87dd2 | 920 | } |
badfe9f5 MD |
921 | return 0; |
922 | } | |
923 | ||
6053e75e | 924 | int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table) |
badfe9f5 | 925 | { |
0bb716a8 MD |
926 | kfree(syscall_table->syscall_dispatch); |
927 | kfree(syscall_table->syscall_exit_dispatch); | |
49c50022 | 928 | #ifdef CONFIG_COMPAT |
0bb716a8 MD |
929 | kfree(syscall_table->compat_syscall_dispatch); |
930 | kfree(syscall_table->compat_syscall_exit_dispatch); | |
49c50022 | 931 | #endif |
0bb716a8 | 932 | kfree(syscall_table->sc_filter); |
80f87dd2 MD |
933 | return 0; |
934 | } | |
935 | ||
12e579db MD |
936 | static |
937 | uint32_t get_sc_tables_len(void) | |
938 | { | |
ebcc64cd | 939 | return sc_table.len + compat_sc_table.len; |
12e579db MD |
940 | } |
941 | ||
badfe9f5 | 942 | static |
ade8a729 FD |
943 | const char *get_syscall_name(const char *desc_name, |
944 | enum lttng_syscall_abi abi, | |
945 | enum lttng_syscall_entryexit entryexit) | |
80f87dd2 | 946 | { |
badfe9f5 | 947 | size_t prefix_len = 0; |
80f87dd2 | 948 | |
80f87dd2 | 949 | |
ade8a729 | 950 | switch (entryexit) { |
badfe9f5 | 951 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 952 | switch (abi) { |
badfe9f5 MD |
953 | case LTTNG_SYSCALL_ABI_NATIVE: |
954 | prefix_len = strlen(SYSCALL_ENTRY_STR); | |
955 | break; | |
956 | case LTTNG_SYSCALL_ABI_COMPAT: | |
957 | prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR); | |
958 | break; | |
80f87dd2 | 959 | } |
badfe9f5 MD |
960 | break; |
961 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 962 | switch (abi) { |
badfe9f5 MD |
963 | case LTTNG_SYSCALL_ABI_NATIVE: |
964 | prefix_len = strlen(SYSCALL_EXIT_STR); | |
965 | break; | |
966 | case LTTNG_SYSCALL_ABI_COMPAT: | |
967 | prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR); | |
968 | break; | |
80f87dd2 | 969 | } |
badfe9f5 | 970 | break; |
80f87dd2 | 971 | } |
badfe9f5 | 972 | WARN_ON_ONCE(prefix_len == 0); |
ade8a729 | 973 | return desc_name + prefix_len; |
badfe9f5 MD |
974 | } |
975 | ||
ade8a729 FD |
976 | static |
977 | int lttng_syscall_filter_enable( | |
978 | struct lttng_syscall_filter *filter, | |
979 | const char *desc_name, enum lttng_syscall_abi abi, | |
99903379 MD |
980 | enum lttng_syscall_entryexit entryexit, |
981 | unsigned int syscall_id) | |
badfe9f5 | 982 | { |
badfe9f5 MD |
983 | const char *syscall_name; |
984 | unsigned long *bitmap; | |
7f52f0d4 | 985 | u32 *refcount_map; |
badfe9f5 | 986 | |
ade8a729 | 987 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
badfe9f5 | 988 | |
ade8a729 | 989 | switch (entryexit) { |
badfe9f5 | 990 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 991 | switch (abi) { |
badfe9f5 MD |
992 | case LTTNG_SYSCALL_ABI_NATIVE: |
993 | bitmap = filter->sc_entry; | |
7f52f0d4 | 994 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
995 | break; |
996 | case LTTNG_SYSCALL_ABI_COMPAT: | |
997 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 998 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 999 | break; |
6d9694d8 MD |
1000 | default: |
1001 | return -EINVAL; | |
80f87dd2 | 1002 | } |
badfe9f5 MD |
1003 | break; |
1004 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1005 | switch (abi) { |
badfe9f5 MD |
1006 | case LTTNG_SYSCALL_ABI_NATIVE: |
1007 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1008 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1009 | break; |
1010 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1011 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1012 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1013 | break; |
6d9694d8 MD |
1014 | default: |
1015 | return -EINVAL; | |
80f87dd2 | 1016 | } |
badfe9f5 MD |
1017 | break; |
1018 | default: | |
1019 | return -EINVAL; | |
80f87dd2 | 1020 | } |
99903379 | 1021 | if (refcount_map[syscall_id] == U32_MAX) |
7f52f0d4 | 1022 | return -EOVERFLOW; |
99903379 MD |
1023 | if (refcount_map[syscall_id]++ == 0) |
1024 | bitmap_set(bitmap, syscall_id, 1); | |
80f87dd2 | 1025 | return 0; |
80f87dd2 MD |
1026 | } |
1027 | ||
9b2f1c54 | 1028 | int lttng_syscall_filter_enable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1029 | { |
9b2f1c54 | 1030 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
9cd106a6 MD |
1031 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
1032 | struct hlist_head *dispatch_list; | |
ca62543e | 1033 | int ret = 0; |
8a8ac9a8 | 1034 | |
9b2f1c54 | 1035 | WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL); |
8a8ac9a8 | 1036 | |
99903379 MD |
1037 | /* Unknown syscall */ |
1038 | if (syscall_id == -1U) { | |
1039 | switch (event->priv->u.syscall.entryexit) { | |
1040 | case LTTNG_SYSCALL_ENTRY: | |
1041 | switch (event->priv->u.syscall.abi) { | |
1042 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1043 | dispatch_list = &syscall_table->unknown_syscall_dispatch; | |
1044 | break; | |
1045 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1046 | dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; | |
1047 | break; | |
1048 | default: | |
1049 | ret = -EINVAL; | |
1050 | goto end; | |
1051 | } | |
9cd106a6 | 1052 | break; |
99903379 MD |
1053 | case LTTNG_SYSCALL_EXIT: |
1054 | switch (event->priv->u.syscall.abi) { | |
1055 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1056 | dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; | |
1057 | break; | |
1058 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1059 | dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; | |
1060 | break; | |
1061 | default: | |
1062 | ret = -EINVAL; | |
1063 | goto end; | |
1064 | } | |
9cd106a6 MD |
1065 | break; |
1066 | default: | |
1067 | ret = -EINVAL; | |
1068 | goto end; | |
1069 | } | |
99903379 MD |
1070 | } else { |
1071 | ret = lttng_syscall_filter_enable(syscall_table->sc_filter, | |
1072 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1073 | event->priv->u.syscall.entryexit, syscall_id); | |
1074 | if (ret) | |
1075 | return ret; | |
1076 | ||
1077 | switch (event->priv->u.syscall.entryexit) { | |
1078 | case LTTNG_SYSCALL_ENTRY: | |
1079 | switch (event->priv->u.syscall.abi) { | |
1080 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1081 | dispatch_list = &syscall_table->syscall_dispatch[syscall_id]; | |
1082 | break; | |
1083 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1084 | dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id]; | |
1085 | break; | |
1086 | default: | |
1087 | ret = -EINVAL; | |
1088 | goto end; | |
1089 | } | |
8a8ac9a8 | 1090 | break; |
99903379 MD |
1091 | case LTTNG_SYSCALL_EXIT: |
1092 | switch (event->priv->u.syscall.abi) { | |
1093 | case LTTNG_SYSCALL_ABI_NATIVE: | |
1094 | dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id]; | |
1095 | break; | |
1096 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1097 | dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id]; | |
1098 | break; | |
1099 | default: | |
1100 | ret = -EINVAL; | |
1101 | goto end; | |
1102 | } | |
8a8ac9a8 | 1103 | break; |
6866b1c7 MJ |
1104 | default: |
1105 | ret = -EINVAL; | |
1106 | goto end; | |
8a8ac9a8 | 1107 | } |
8a8ac9a8 | 1108 | } |
9cd106a6 MD |
1109 | |
1110 | hlist_add_head_rcu(&event->priv->u.syscall.node, dispatch_list); | |
8a8ac9a8 | 1111 | end: |
9b2f1c54 | 1112 | return ret; |
ade8a729 FD |
1113 | } |
1114 | ||
1115 | static | |
f2db8be3 | 1116 | int lttng_syscall_filter_disable(struct lttng_syscall_filter *filter, |
ade8a729 | 1117 | const char *desc_name, enum lttng_syscall_abi abi, |
99903379 MD |
1118 | enum lttng_syscall_entryexit entryexit, |
1119 | unsigned int syscall_id) | |
ade8a729 | 1120 | { |
badfe9f5 MD |
1121 | const char *syscall_name; |
1122 | unsigned long *bitmap; | |
7f52f0d4 | 1123 | u32 *refcount_map; |
80f87dd2 | 1124 | |
ade8a729 | 1125 | syscall_name = get_syscall_name(desc_name, abi, entryexit); |
80f87dd2 | 1126 | |
ade8a729 | 1127 | switch (entryexit) { |
badfe9f5 | 1128 | case LTTNG_SYSCALL_ENTRY: |
ade8a729 | 1129 | switch (abi) { |
badfe9f5 MD |
1130 | case LTTNG_SYSCALL_ABI_NATIVE: |
1131 | bitmap = filter->sc_entry; | |
7f52f0d4 | 1132 | refcount_map = filter->sc_entry_refcount_map; |
badfe9f5 MD |
1133 | break; |
1134 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1135 | bitmap = filter->sc_compat_entry; | |
7f52f0d4 | 1136 | refcount_map = filter->sc_compat_entry_refcount_map; |
badfe9f5 | 1137 | break; |
6d9694d8 MD |
1138 | default: |
1139 | return -EINVAL; | |
80f87dd2 | 1140 | } |
badfe9f5 MD |
1141 | break; |
1142 | case LTTNG_SYSCALL_EXIT: | |
ade8a729 | 1143 | switch (abi) { |
badfe9f5 MD |
1144 | case LTTNG_SYSCALL_ABI_NATIVE: |
1145 | bitmap = filter->sc_exit; | |
7f52f0d4 | 1146 | refcount_map = filter->sc_exit_refcount_map; |
badfe9f5 MD |
1147 | break; |
1148 | case LTTNG_SYSCALL_ABI_COMPAT: | |
1149 | bitmap = filter->sc_compat_exit; | |
7f52f0d4 | 1150 | refcount_map = filter->sc_compat_exit_refcount_map; |
badfe9f5 | 1151 | break; |
6d9694d8 MD |
1152 | default: |
1153 | return -EINVAL; | |
80f87dd2 | 1154 | } |
badfe9f5 MD |
1155 | break; |
1156 | default: | |
1157 | return -EINVAL; | |
80f87dd2 | 1158 | } |
99903379 | 1159 | if (refcount_map[syscall_id] == 0) |
7f52f0d4 | 1160 | return -ENOENT; |
99903379 MD |
1161 | if (--refcount_map[syscall_id] == 0) |
1162 | bitmap_clear(bitmap, syscall_id, 1); | |
badfe9f5 | 1163 | return 0; |
259b6cb3 | 1164 | } |
2d2464bd | 1165 | |
9b2f1c54 | 1166 | int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event) |
8a8ac9a8 | 1167 | { |
9b2f1c54 | 1168 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event); |
7f52f0d4 | 1169 | unsigned int syscall_id = event->priv->u.syscall.syscall_id; |
8a8ac9a8 FD |
1170 | int ret; |
1171 | ||
99903379 MD |
1172 | /* Except for unknown syscall */ |
1173 | if (syscall_id != -1U) { | |
1174 | ret = lttng_syscall_filter_disable(syscall_table->sc_filter, | |
1175 | event->priv->desc->event_name, event->priv->u.syscall.abi, | |
1176 | event->priv->u.syscall.entryexit, syscall_id); | |
1177 | if (ret) | |
1178 | return ret; | |
1179 | } | |
9cd106a6 | 1180 | hlist_del_rcu(&event->priv->u.syscall.node); |
8a8ac9a8 FD |
1181 | return 0; |
1182 | } | |
1183 | ||
9cb5be7e MD |
1184 | void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *event_enabler) |
1185 | { | |
1186 | struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); | |
1187 | enum lttng_kernel_abi_syscall_entryexit entryexit; | |
1188 | int enabled = event_enabler->enabled; | |
1189 | ||
552f7c79 | 1190 | if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) |
9cb5be7e | 1191 | return; |
9cb5be7e MD |
1192 | entryexit = event_enabler->event_param.u.syscall.entryexit; |
1193 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1194 | WRITE_ONCE(syscall_table->syscall_all_entry, enabled); | |
1195 | ||
1196 | if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) | |
1197 | WRITE_ONCE(syscall_table->syscall_all_exit, enabled); | |
1198 | } | |
1199 | ||
2d2464bd MD |
1200 | static |
1201 | const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) | |
1202 | { | |
1203 | const struct trace_syscall_entry *entry; | |
1204 | int iter = 0; | |
1205 | ||
ebcc64cd FD |
1206 | for (entry = sc_table.table; |
1207 | entry < sc_table.table + sc_table.len; | |
2d2464bd MD |
1208 | entry++) { |
1209 | if (iter++ >= *pos) | |
1210 | return entry; | |
1211 | } | |
ebcc64cd FD |
1212 | for (entry = compat_sc_table.table; |
1213 | entry < compat_sc_table.table + compat_sc_table.len; | |
2d2464bd MD |
1214 | entry++) { |
1215 | if (iter++ >= *pos) | |
1216 | return entry; | |
1217 | } | |
1218 | /* End of list */ | |
1219 | return NULL; | |
1220 | } | |
1221 | ||
1222 | static | |
1223 | void *syscall_list_start(struct seq_file *m, loff_t *pos) | |
1224 | { | |
1225 | return (void *) syscall_list_get_entry(pos); | |
1226 | } | |
1227 | ||
1228 | static | |
1229 | void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) | |
1230 | { | |
1231 | (*ppos)++; | |
1232 | return (void *) syscall_list_get_entry(ppos); | |
1233 | } | |
1234 | ||
1235 | static | |
1236 | void syscall_list_stop(struct seq_file *m, void *p) | |
1237 | { | |
1238 | } | |
1239 | ||
12e579db MD |
1240 | static |
1241 | int get_sc_table(const struct trace_syscall_entry *entry, | |
1242 | const struct trace_syscall_entry **table, | |
1243 | unsigned int *bitness) | |
1244 | { | |
ebcc64cd | 1245 | if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) { |
12e579db MD |
1246 | if (bitness) |
1247 | *bitness = BITS_PER_LONG; | |
1248 | if (table) | |
ebcc64cd | 1249 | *table = sc_table.table; |
12e579db MD |
1250 | return 0; |
1251 | } | |
ebcc64cd FD |
1252 | if (!(entry >= compat_sc_table.table |
1253 | && entry < compat_sc_table.table + compat_sc_table.len)) { | |
12e579db MD |
1254 | return -EINVAL; |
1255 | } | |
1256 | if (bitness) | |
1257 | *bitness = 32; | |
1258 | if (table) | |
ebcc64cd | 1259 | *table = compat_sc_table.table; |
12e579db MD |
1260 | return 0; |
1261 | } | |
1262 | ||
2d2464bd MD |
1263 | static |
1264 | int syscall_list_show(struct seq_file *m, void *p) | |
1265 | { | |
1266 | const struct trace_syscall_entry *table, *entry = p; | |
1267 | unsigned int bitness; | |
d4291869 | 1268 | unsigned long index; |
12e579db | 1269 | int ret; |
d4291869 | 1270 | const char *name; |
2d2464bd | 1271 | |
12e579db MD |
1272 | ret = get_sc_table(entry, &table, &bitness); |
1273 | if (ret) | |
1274 | return ret; | |
f4855b46 MD |
1275 | if (!entry->desc) |
1276 | return 0; | |
ebcc64cd | 1277 | if (table == sc_table.table) { |
d4291869 | 1278 | index = entry - table; |
437d5aa5 | 1279 | name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)]; |
d4291869 | 1280 | } else { |
ebcc64cd | 1281 | index = (entry - table) + sc_table.len; |
437d5aa5 | 1282 | name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; |
d4291869 | 1283 | } |
12e579db | 1284 | seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", |
d4291869 | 1285 | index, name, bitness); |
2d2464bd MD |
1286 | return 0; |
1287 | } | |
1288 | ||
1289 | static | |
1290 | const struct seq_operations lttng_syscall_list_seq_ops = { | |
1291 | .start = syscall_list_start, | |
1292 | .next = syscall_list_next, | |
1293 | .stop = syscall_list_stop, | |
1294 | .show = syscall_list_show, | |
1295 | }; | |
1296 | ||
1297 | static | |
1298 | int lttng_syscall_list_open(struct inode *inode, struct file *file) | |
1299 | { | |
1300 | return seq_open(file, <tng_syscall_list_seq_ops); | |
1301 | } | |
1302 | ||
1303 | const struct file_operations lttng_syscall_list_fops = { | |
1304 | .owner = THIS_MODULE, | |
1305 | .open = lttng_syscall_list_open, | |
1306 | .read = seq_read, | |
1307 | .llseek = seq_lseek, | |
1308 | .release = seq_release, | |
1309 | }; | |
12e579db | 1310 | |
badfe9f5 MD |
1311 | /* |
1312 | * A syscall is enabled if it is traced for either entry or exit. | |
1313 | */ | |
c970b655 | 1314 | long lttng_syscall_table_get_active_mask(struct lttng_kernel_syscall_table *syscall_table, |
606828e4 | 1315 | struct lttng_kernel_abi_syscall_mask __user *usyscall_mask) |
12e579db MD |
1316 | { |
1317 | uint32_t len, sc_tables_len, bitmask_len; | |
1318 | int ret = 0, bit; | |
1319 | char *tmp_mask; | |
1320 | struct lttng_syscall_filter *filter; | |
1321 | ||
1322 | ret = get_user(len, &usyscall_mask->len); | |
1323 | if (ret) | |
1324 | return ret; | |
1325 | sc_tables_len = get_sc_tables_len(); | |
1326 | bitmask_len = ALIGN(sc_tables_len, 8) >> 3; | |
1327 | if (len < sc_tables_len) { | |
1328 | return put_user(sc_tables_len, &usyscall_mask->len); | |
1329 | } | |
1330 | /* Array is large enough, we can copy array to user-space. */ | |
1331 | tmp_mask = kzalloc(bitmask_len, GFP_KERNEL); | |
1332 | if (!tmp_mask) | |
1333 | return -ENOMEM; | |
0bb716a8 | 1334 | filter = syscall_table->sc_filter; |
12e579db | 1335 | |
ebcc64cd | 1336 | for (bit = 0; bit < sc_table.len; bit++) { |
e2129868 | 1337 | char state; |
2f25059d | 1338 | |
0bb716a8 MD |
1339 | if (syscall_table->syscall_dispatch) { |
1340 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1341 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
badfe9f5 MD |
1342 | state = test_bit(bit, filter->sc_entry) |
1343 | || test_bit(bit, filter->sc_exit); | |
2f25059d MD |
1344 | else |
1345 | state = 1; | |
1346 | } else { | |
1347 | state = 0; | |
1348 | } | |
1349 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1350 | } |
1351 | for (; bit < sc_tables_len; bit++) { | |
e2129868 | 1352 | char state; |
2f25059d | 1353 | |
0bb716a8 MD |
1354 | if (syscall_table->compat_syscall_dispatch) { |
1355 | if (!(READ_ONCE(syscall_table->syscall_all_entry) | |
1356 | || READ_ONCE(syscall_table->syscall_all_exit)) && filter) | |
ebcc64cd | 1357 | state = test_bit(bit - sc_table.len, |
badfe9f5 | 1358 | filter->sc_compat_entry) |
ebcc64cd | 1359 | || test_bit(bit - sc_table.len, |
badfe9f5 | 1360 | filter->sc_compat_exit); |
2f25059d MD |
1361 | else |
1362 | state = 1; | |
1363 | } else { | |
1364 | state = 0; | |
1365 | } | |
1366 | bt_bitfield_write_be(tmp_mask, char, bit, 1, state); | |
12e579db MD |
1367 | } |
1368 | if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len)) | |
1369 | ret = -EFAULT; | |
1370 | kfree(tmp_mask); | |
1371 | return ret; | |
1372 | } |