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Diffstat (limited to 'kernel/trace/trace_syscalls.c')
-rw-r--r--kernel/trace/trace_syscalls.c195
1 files changed, 86 insertions, 109 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index ddee9c593732..57501d90096a 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -51,32 +51,6 @@ static struct syscall_metadata *syscall_nr_to_meta(int nr)
51 return syscalls_metadata[nr]; 51 return syscalls_metadata[nr];
52} 52}
53 53
54int syscall_name_to_nr(char *name)
55{
56 int i;
57
58 if (!syscalls_metadata)
59 return -1;
60
61 for (i = 0; i < NR_syscalls; i++) {
62 if (syscalls_metadata[i]) {
63 if (!strcmp(syscalls_metadata[i]->name, name))
64 return i;
65 }
66 }
67 return -1;
68}
69
70void set_syscall_enter_id(int num, int id)
71{
72 syscalls_metadata[num]->enter_id = id;
73}
74
75void set_syscall_exit_id(int num, int id)
76{
77 syscalls_metadata[num]->exit_id = id;
78}
79
80enum print_line_t 54enum print_line_t
81print_syscall_enter(struct trace_iterator *iter, int flags) 55print_syscall_enter(struct trace_iterator *iter, int flags)
82{ 56{
@@ -93,7 +67,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags)
93 if (!entry) 67 if (!entry)
94 goto end; 68 goto end;
95 69
96 if (entry->enter_id != ent->type) { 70 if (entry->enter_event->id != ent->type) {
97 WARN_ON_ONCE(1); 71 WARN_ON_ONCE(1);
98 goto end; 72 goto end;
99 } 73 }
@@ -148,7 +122,7 @@ print_syscall_exit(struct trace_iterator *iter, int flags)
148 return TRACE_TYPE_HANDLED; 122 return TRACE_TYPE_HANDLED;
149 } 123 }
150 124
151 if (entry->exit_id != ent->type) { 125 if (entry->exit_event->id != ent->type) {
152 WARN_ON_ONCE(1); 126 WARN_ON_ONCE(1);
153 return TRACE_TYPE_UNHANDLED; 127 return TRACE_TYPE_UNHANDLED;
154 } 128 }
@@ -166,24 +140,19 @@ extern char *__bad_type_size(void);
166#define SYSCALL_FIELD(type, name) \ 140#define SYSCALL_FIELD(type, name) \
167 sizeof(type) != sizeof(trace.name) ? \ 141 sizeof(type) != sizeof(trace.name) ? \
168 __bad_type_size() : \ 142 __bad_type_size() : \
169 #type, #name, offsetof(typeof(trace), name), sizeof(trace.name) 143 #type, #name, offsetof(typeof(trace), name), \
144 sizeof(trace.name), is_signed_type(type)
170 145
171int syscall_enter_format(struct ftrace_event_call *call, struct trace_seq *s) 146int syscall_enter_format(struct ftrace_event_call *call, struct trace_seq *s)
172{ 147{
173 int i; 148 int i;
174 int nr;
175 int ret; 149 int ret;
176 struct syscall_metadata *entry; 150 struct syscall_metadata *entry = call->data;
177 struct syscall_trace_enter trace; 151 struct syscall_trace_enter trace;
178 int offset = offsetof(struct syscall_trace_enter, args); 152 int offset = offsetof(struct syscall_trace_enter, args);
179 153
180 nr = syscall_name_to_nr(call->data); 154 ret = trace_seq_printf(s, "\tfield:%s %s;\toffset:%zu;\tsize:%zu;"
181 entry = syscall_nr_to_meta(nr); 155 "\tsigned:%u;\n",
182
183 if (!entry)
184 return 0;
185
186 ret = trace_seq_printf(s, "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n",
187 SYSCALL_FIELD(int, nr)); 156 SYSCALL_FIELD(int, nr));
188 if (!ret) 157 if (!ret)
189 return 0; 158 return 0;
@@ -193,8 +162,10 @@ int syscall_enter_format(struct ftrace_event_call *call, struct trace_seq *s)
193 entry->args[i]); 162 entry->args[i]);
194 if (!ret) 163 if (!ret)
195 return 0; 164 return 0;
196 ret = trace_seq_printf(s, "\toffset:%d;\tsize:%zu;\n", offset, 165 ret = trace_seq_printf(s, "\toffset:%d;\tsize:%zu;"
197 sizeof(unsigned long)); 166 "\tsigned:%u;\n", offset,
167 sizeof(unsigned long),
168 is_signed_type(unsigned long));
198 if (!ret) 169 if (!ret)
199 return 0; 170 return 0;
200 offset += sizeof(unsigned long); 171 offset += sizeof(unsigned long);
@@ -226,8 +197,10 @@ int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s)
226 struct syscall_trace_exit trace; 197 struct syscall_trace_exit trace;
227 198
228 ret = trace_seq_printf(s, 199 ret = trace_seq_printf(s,
229 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" 200 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;"
230 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n", 201 "\tsigned:%u;\n"
202 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;"
203 "\tsigned:%u;\n",
231 SYSCALL_FIELD(int, nr), 204 SYSCALL_FIELD(int, nr),
232 SYSCALL_FIELD(long, ret)); 205 SYSCALL_FIELD(long, ret));
233 if (!ret) 206 if (!ret)
@@ -239,22 +212,19 @@ int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s)
239int syscall_enter_define_fields(struct ftrace_event_call *call) 212int syscall_enter_define_fields(struct ftrace_event_call *call)
240{ 213{
241 struct syscall_trace_enter trace; 214 struct syscall_trace_enter trace;
242 struct syscall_metadata *meta; 215 struct syscall_metadata *meta = call->data;
243 int ret; 216 int ret;
244 int nr;
245 int i; 217 int i;
246 int offset = offsetof(typeof(trace), args); 218 int offset = offsetof(typeof(trace), args);
247 219
248 nr = syscall_name_to_nr(call->data);
249 meta = syscall_nr_to_meta(nr);
250
251 if (!meta)
252 return 0;
253
254 ret = trace_define_common_fields(call); 220 ret = trace_define_common_fields(call);
255 if (ret) 221 if (ret)
256 return ret; 222 return ret;
257 223
224 ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER);
225 if (ret)
226 return ret;
227
258 for (i = 0; i < meta->nb_args; i++) { 228 for (i = 0; i < meta->nb_args; i++) {
259 ret = trace_define_field(call, meta->types[i], 229 ret = trace_define_field(call, meta->types[i],
260 meta->args[i], offset, 230 meta->args[i], offset,
@@ -275,7 +245,11 @@ int syscall_exit_define_fields(struct ftrace_event_call *call)
275 if (ret) 245 if (ret)
276 return ret; 246 return ret;
277 247
278 ret = trace_define_field(call, SYSCALL_FIELD(long, ret), 0, 248 ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER);
249 if (ret)
250 return ret;
251
252 ret = trace_define_field(call, SYSCALL_FIELD(long, ret),
279 FILTER_OTHER); 253 FILTER_OTHER);
280 254
281 return ret; 255 return ret;
@@ -302,8 +276,8 @@ void ftrace_syscall_enter(struct pt_regs *regs, long id)
302 276
303 size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args; 277 size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
304 278
305 event = trace_current_buffer_lock_reserve(&buffer, sys_data->enter_id, 279 event = trace_current_buffer_lock_reserve(&buffer,
306 size, 0, 0); 280 sys_data->enter_event->id, size, 0, 0);
307 if (!event) 281 if (!event)
308 return; 282 return;
309 283
@@ -334,8 +308,8 @@ void ftrace_syscall_exit(struct pt_regs *regs, long ret)
334 if (!sys_data) 308 if (!sys_data)
335 return; 309 return;
336 310
337 event = trace_current_buffer_lock_reserve(&buffer, sys_data->exit_id, 311 event = trace_current_buffer_lock_reserve(&buffer,
338 sizeof(*entry), 0, 0); 312 sys_data->exit_event->id, sizeof(*entry), 0, 0);
339 if (!event) 313 if (!event)
340 return; 314 return;
341 315
@@ -348,14 +322,12 @@ void ftrace_syscall_exit(struct pt_regs *regs, long ret)
348 trace_current_buffer_unlock_commit(buffer, event, 0, 0); 322 trace_current_buffer_unlock_commit(buffer, event, 0, 0);
349} 323}
350 324
351int reg_event_syscall_enter(void *ptr) 325int reg_event_syscall_enter(struct ftrace_event_call *call)
352{ 326{
353 int ret = 0; 327 int ret = 0;
354 int num; 328 int num;
355 char *name;
356 329
357 name = (char *)ptr; 330 num = ((struct syscall_metadata *)call->data)->syscall_nr;
358 num = syscall_name_to_nr(name);
359 if (num < 0 || num >= NR_syscalls) 331 if (num < 0 || num >= NR_syscalls)
360 return -ENOSYS; 332 return -ENOSYS;
361 mutex_lock(&syscall_trace_lock); 333 mutex_lock(&syscall_trace_lock);
@@ -372,13 +344,11 @@ int reg_event_syscall_enter(void *ptr)
372 return ret; 344 return ret;
373} 345}
374 346
375void unreg_event_syscall_enter(void *ptr) 347void unreg_event_syscall_enter(struct ftrace_event_call *call)
376{ 348{
377 int num; 349 int num;
378 char *name;
379 350
380 name = (char *)ptr; 351 num = ((struct syscall_metadata *)call->data)->syscall_nr;
381 num = syscall_name_to_nr(name);
382 if (num < 0 || num >= NR_syscalls) 352 if (num < 0 || num >= NR_syscalls)
383 return; 353 return;
384 mutex_lock(&syscall_trace_lock); 354 mutex_lock(&syscall_trace_lock);
@@ -389,14 +359,12 @@ void unreg_event_syscall_enter(void *ptr)
389 mutex_unlock(&syscall_trace_lock); 359 mutex_unlock(&syscall_trace_lock);
390} 360}
391 361
392int reg_event_syscall_exit(void *ptr) 362int reg_event_syscall_exit(struct ftrace_event_call *call)
393{ 363{
394 int ret = 0; 364 int ret = 0;
395 int num; 365 int num;
396 char *name;
397 366
398 name = (char *)ptr; 367 num = ((struct syscall_metadata *)call->data)->syscall_nr;
399 num = syscall_name_to_nr(name);
400 if (num < 0 || num >= NR_syscalls) 368 if (num < 0 || num >= NR_syscalls)
401 return -ENOSYS; 369 return -ENOSYS;
402 mutex_lock(&syscall_trace_lock); 370 mutex_lock(&syscall_trace_lock);
@@ -413,13 +381,11 @@ int reg_event_syscall_exit(void *ptr)
413 return ret; 381 return ret;
414} 382}
415 383
416void unreg_event_syscall_exit(void *ptr) 384void unreg_event_syscall_exit(struct ftrace_event_call *call)
417{ 385{
418 int num; 386 int num;
419 char *name;
420 387
421 name = (char *)ptr; 388 num = ((struct syscall_metadata *)call->data)->syscall_nr;
422 num = syscall_name_to_nr(name);
423 if (num < 0 || num >= NR_syscalls) 389 if (num < 0 || num >= NR_syscalls)
424 return; 390 return;
425 mutex_lock(&syscall_trace_lock); 391 mutex_lock(&syscall_trace_lock);
@@ -430,13 +396,17 @@ void unreg_event_syscall_exit(void *ptr)
430 mutex_unlock(&syscall_trace_lock); 396 mutex_unlock(&syscall_trace_lock);
431} 397}
432 398
433struct trace_event event_syscall_enter = { 399int init_syscall_trace(struct ftrace_event_call *call)
434 .trace = print_syscall_enter, 400{
435}; 401 int id;
436 402
437struct trace_event event_syscall_exit = { 403 id = register_ftrace_event(call->event);
438 .trace = print_syscall_exit, 404 if (!id)
439}; 405 return -ENODEV;
406 call->id = id;
407 INIT_LIST_HEAD(&call->fields);
408 return 0;
409}
440 410
441int __init init_ftrace_syscalls(void) 411int __init init_ftrace_syscalls(void)
442{ 412{
@@ -454,6 +424,10 @@ int __init init_ftrace_syscalls(void)
454 for (i = 0; i < NR_syscalls; i++) { 424 for (i = 0; i < NR_syscalls; i++) {
455 addr = arch_syscall_addr(i); 425 addr = arch_syscall_addr(i);
456 meta = find_syscall_meta(addr); 426 meta = find_syscall_meta(addr);
427 if (!meta)
428 continue;
429
430 meta->syscall_nr = i;
457 syscalls_metadata[i] = meta; 431 syscalls_metadata[i] = meta;
458 } 432 }
459 433
@@ -473,8 +447,10 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
473 struct syscall_metadata *sys_data; 447 struct syscall_metadata *sys_data;
474 struct syscall_trace_enter *rec; 448 struct syscall_trace_enter *rec;
475 unsigned long flags; 449 unsigned long flags;
450 char *trace_buf;
476 char *raw_data; 451 char *raw_data;
477 int syscall_nr; 452 int syscall_nr;
453 int rctx;
478 int size; 454 int size;
479 int cpu; 455 int cpu;
480 456
@@ -498,41 +474,42 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
498 /* Protect the per cpu buffer, begin the rcu read side */ 474 /* Protect the per cpu buffer, begin the rcu read side */
499 local_irq_save(flags); 475 local_irq_save(flags);
500 476
477 rctx = perf_swevent_get_recursion_context();
478 if (rctx < 0)
479 goto end_recursion;
480
501 cpu = smp_processor_id(); 481 cpu = smp_processor_id();
502 482
503 if (in_nmi()) 483 trace_buf = rcu_dereference(perf_trace_buf);
504 raw_data = rcu_dereference(trace_profile_buf_nmi);
505 else
506 raw_data = rcu_dereference(trace_profile_buf);
507 484
508 if (!raw_data) 485 if (!trace_buf)
509 goto end; 486 goto end;
510 487
511 raw_data = per_cpu_ptr(raw_data, cpu); 488 raw_data = per_cpu_ptr(trace_buf, cpu);
512 489
513 /* zero the dead bytes from align to not leak stack to user */ 490 /* zero the dead bytes from align to not leak stack to user */
514 *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL; 491 *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL;
515 492
516 rec = (struct syscall_trace_enter *) raw_data; 493 rec = (struct syscall_trace_enter *) raw_data;
517 tracing_generic_entry_update(&rec->ent, 0, 0); 494 tracing_generic_entry_update(&rec->ent, 0, 0);
518 rec->ent.type = sys_data->enter_id; 495 rec->ent.type = sys_data->enter_event->id;
519 rec->nr = syscall_nr; 496 rec->nr = syscall_nr;
520 syscall_get_arguments(current, regs, 0, sys_data->nb_args, 497 syscall_get_arguments(current, regs, 0, sys_data->nb_args,
521 (unsigned long *)&rec->args); 498 (unsigned long *)&rec->args);
522 perf_tp_event(sys_data->enter_id, 0, 1, rec, size); 499 perf_tp_event(sys_data->enter_event->id, 0, 1, rec, size);
523 500
524end: 501end:
502 perf_swevent_put_recursion_context(rctx);
503end_recursion:
525 local_irq_restore(flags); 504 local_irq_restore(flags);
526} 505}
527 506
528int reg_prof_syscall_enter(char *name) 507int prof_sysenter_enable(struct ftrace_event_call *call)
529{ 508{
530 int ret = 0; 509 int ret = 0;
531 int num; 510 int num;
532 511
533 num = syscall_name_to_nr(name); 512 num = ((struct syscall_metadata *)call->data)->syscall_nr;
534 if (num < 0 || num >= NR_syscalls)
535 return -ENOSYS;
536 513
537 mutex_lock(&syscall_trace_lock); 514 mutex_lock(&syscall_trace_lock);
538 if (!sys_prof_refcount_enter) 515 if (!sys_prof_refcount_enter)
@@ -548,13 +525,11 @@ int reg_prof_syscall_enter(char *name)
548 return ret; 525 return ret;
549} 526}
550 527
551void unreg_prof_syscall_enter(char *name) 528void prof_sysenter_disable(struct ftrace_event_call *call)
552{ 529{
553 int num; 530 int num;
554 531
555 num = syscall_name_to_nr(name); 532 num = ((struct syscall_metadata *)call->data)->syscall_nr;
556 if (num < 0 || num >= NR_syscalls)
557 return;
558 533
559 mutex_lock(&syscall_trace_lock); 534 mutex_lock(&syscall_trace_lock);
560 sys_prof_refcount_enter--; 535 sys_prof_refcount_enter--;
@@ -570,7 +545,9 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
570 struct syscall_trace_exit *rec; 545 struct syscall_trace_exit *rec;
571 unsigned long flags; 546 unsigned long flags;
572 int syscall_nr; 547 int syscall_nr;
548 char *trace_buf;
573 char *raw_data; 549 char *raw_data;
550 int rctx;
574 int size; 551 int size;
575 int cpu; 552 int cpu;
576 553
@@ -596,17 +573,19 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
596 573
597 /* Protect the per cpu buffer, begin the rcu read side */ 574 /* Protect the per cpu buffer, begin the rcu read side */
598 local_irq_save(flags); 575 local_irq_save(flags);
576
577 rctx = perf_swevent_get_recursion_context();
578 if (rctx < 0)
579 goto end_recursion;
580
599 cpu = smp_processor_id(); 581 cpu = smp_processor_id();
600 582
601 if (in_nmi()) 583 trace_buf = rcu_dereference(perf_trace_buf);
602 raw_data = rcu_dereference(trace_profile_buf_nmi);
603 else
604 raw_data = rcu_dereference(trace_profile_buf);
605 584
606 if (!raw_data) 585 if (!trace_buf)
607 goto end; 586 goto end;
608 587
609 raw_data = per_cpu_ptr(raw_data, cpu); 588 raw_data = per_cpu_ptr(trace_buf, cpu);
610 589
611 /* zero the dead bytes from align to not leak stack to user */ 590 /* zero the dead bytes from align to not leak stack to user */
612 *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL; 591 *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL;
@@ -614,24 +593,24 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
614 rec = (struct syscall_trace_exit *)raw_data; 593 rec = (struct syscall_trace_exit *)raw_data;
615 594
616 tracing_generic_entry_update(&rec->ent, 0, 0); 595 tracing_generic_entry_update(&rec->ent, 0, 0);
617 rec->ent.type = sys_data->exit_id; 596 rec->ent.type = sys_data->exit_event->id;
618 rec->nr = syscall_nr; 597 rec->nr = syscall_nr;
619 rec->ret = syscall_get_return_value(current, regs); 598 rec->ret = syscall_get_return_value(current, regs);
620 599
621 perf_tp_event(sys_data->exit_id, 0, 1, rec, size); 600 perf_tp_event(sys_data->exit_event->id, 0, 1, rec, size);
622 601
623end: 602end:
603 perf_swevent_put_recursion_context(rctx);
604end_recursion:
624 local_irq_restore(flags); 605 local_irq_restore(flags);
625} 606}
626 607
627int reg_prof_syscall_exit(char *name) 608int prof_sysexit_enable(struct ftrace_event_call *call)
628{ 609{
629 int ret = 0; 610 int ret = 0;
630 int num; 611 int num;
631 612
632 num = syscall_name_to_nr(name); 613 num = ((struct syscall_metadata *)call->data)->syscall_nr;
633 if (num < 0 || num >= NR_syscalls)
634 return -ENOSYS;
635 614
636 mutex_lock(&syscall_trace_lock); 615 mutex_lock(&syscall_trace_lock);
637 if (!sys_prof_refcount_exit) 616 if (!sys_prof_refcount_exit)
@@ -647,13 +626,11 @@ int reg_prof_syscall_exit(char *name)
647 return ret; 626 return ret;
648} 627}
649 628
650void unreg_prof_syscall_exit(char *name) 629void prof_sysexit_disable(struct ftrace_event_call *call)
651{ 630{
652 int num; 631 int num;
653 632
654 num = syscall_name_to_nr(name); 633 num = ((struct syscall_metadata *)call->data)->syscall_nr;
655 if (num < 0 || num >= NR_syscalls)
656 return;
657 634
658 mutex_lock(&syscall_trace_lock); 635 mutex_lock(&syscall_trace_lock);
659 sys_prof_refcount_exit--; 636 sys_prof_refcount_exit--;
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-04 15:18:06 -0500