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TOMOYO Linux Cross Reference
Linux/kernel/trace/trace_uprobe.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * uprobes-based tracing events
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11  * GNU General Public License for more details.
 12  *
 13  * You should have received a copy of the GNU General Public License
 14  * along with this program; if not, write to the Free Software
 15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 16  *
 17  * Copyright (C) IBM Corporation, 2010-2012
 18  * Author:      Srikar Dronamraju <srikar@linux.vnet.ibm.com>
 19  */
 20 #define pr_fmt(fmt)     "trace_kprobe: " fmt
 21 
 22 #include <linux/module.h>
 23 #include <linux/uaccess.h>
 24 #include <linux/uprobes.h>
 25 #include <linux/namei.h>
 26 #include <linux/string.h>
 27 #include <linux/rculist.h>
 28 
 29 #include "trace_probe.h"
 30 
 31 #define UPROBE_EVENT_SYSTEM     "uprobes"
 32 
 33 struct uprobe_trace_entry_head {
 34         struct trace_entry      ent;
 35         unsigned long           vaddr[];
 36 };
 37 
 38 #define SIZEOF_TRACE_ENTRY(is_return)                   \
 39         (sizeof(struct uprobe_trace_entry_head) +       \
 40          sizeof(unsigned long) * (is_return ? 2 : 1))
 41 
 42 #define DATAOF_TRACE_ENTRY(entry, is_return)            \
 43         ((void*)(entry) + SIZEOF_TRACE_ENTRY(is_return))
 44 
 45 struct trace_uprobe_filter {
 46         rwlock_t                rwlock;
 47         int                     nr_systemwide;
 48         struct list_head        perf_events;
 49 };
 50 
 51 /*
 52  * uprobe event core functions
 53  */
 54 struct trace_uprobe {
 55         struct list_head                list;
 56         struct trace_uprobe_filter      filter;
 57         struct uprobe_consumer          consumer;
 58         struct inode                    *inode;
 59         char                            *filename;
 60         unsigned long                   offset;
 61         unsigned long                   nhit;
 62         struct trace_probe              tp;
 63 };
 64 
 65 #define SIZEOF_TRACE_UPROBE(n)                          \
 66         (offsetof(struct trace_uprobe, tp.args) +       \
 67         (sizeof(struct probe_arg) * (n)))
 68 
 69 static int register_uprobe_event(struct trace_uprobe *tu);
 70 static int unregister_uprobe_event(struct trace_uprobe *tu);
 71 
 72 static DEFINE_MUTEX(uprobe_lock);
 73 static LIST_HEAD(uprobe_list);
 74 
 75 struct uprobe_dispatch_data {
 76         struct trace_uprobe     *tu;
 77         unsigned long           bp_addr;
 78 };
 79 
 80 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs);
 81 static int uretprobe_dispatcher(struct uprobe_consumer *con,
 82                                 unsigned long func, struct pt_regs *regs);
 83 
 84 #ifdef CONFIG_STACK_GROWSUP
 85 static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n)
 86 {
 87         return addr - (n * sizeof(long));
 88 }
 89 #else
 90 static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n)
 91 {
 92         return addr + (n * sizeof(long));
 93 }
 94 #endif
 95 
 96 static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n)
 97 {
 98         unsigned long ret;
 99         unsigned long addr = user_stack_pointer(regs);
100 
101         addr = adjust_stack_addr(addr, n);
102 
103         if (copy_from_user(&ret, (void __force __user *) addr, sizeof(ret)))
104                 return 0;
105 
106         return ret;
107 }
108 
109 /*
110  * Uprobes-specific fetch functions
111  */
112 #define DEFINE_FETCH_stack(type)                                        \
113 static void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,          \
114                                          void *offset, void *dest)      \
115 {                                                                       \
116         *(type *)dest = (type)get_user_stack_nth(regs,                  \
117                                               ((unsigned long)offset)); \
118 }
119 DEFINE_BASIC_FETCH_FUNCS(stack)
120 /* No string on the stack entry */
121 #define fetch_stack_string      NULL
122 #define fetch_stack_string_size NULL
123 
124 #define DEFINE_FETCH_memory(type)                                       \
125 static void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,         \
126                                           void *addr, void *dest)       \
127 {                                                                       \
128         type retval;                                                    \
129         void __user *vaddr = (void __force __user *) addr;              \
130                                                                         \
131         if (copy_from_user(&retval, vaddr, sizeof(type)))               \
132                 *(type *)dest = 0;                                      \
133         else                                                            \
134                 *(type *) dest = retval;                                \
135 }
136 DEFINE_BASIC_FETCH_FUNCS(memory)
137 /*
138  * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
139  * length and relative data location.
140  */
141 static void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
142                                             void *addr, void *dest)
143 {
144         long ret;
145         u32 rloc = *(u32 *)dest;
146         int maxlen  = get_rloc_len(rloc);
147         u8 *dst = get_rloc_data(dest);
148         void __user *src = (void __force __user *) addr;
149 
150         if (!maxlen)
151                 return;
152 
153         ret = strncpy_from_user(dst, src, maxlen);
154 
155         if (ret < 0) {  /* Failed to fetch string */
156                 ((u8 *)get_rloc_data(dest))[0] = '\0';
157                 *(u32 *)dest = make_data_rloc(0, get_rloc_offs(rloc));
158         } else {
159                 *(u32 *)dest = make_data_rloc(ret, get_rloc_offs(rloc));
160         }
161 }
162 
163 static void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
164                                                  void *addr, void *dest)
165 {
166         int len;
167         void __user *vaddr = (void __force __user *) addr;
168 
169         len = strnlen_user(vaddr, MAX_STRING_SIZE);
170 
171         if (len == 0 || len > MAX_STRING_SIZE)  /* Failed to check length */
172                 *(u32 *)dest = 0;
173         else
174                 *(u32 *)dest = len;
175 }
176 
177 static unsigned long translate_user_vaddr(void *file_offset)
178 {
179         unsigned long base_addr;
180         struct uprobe_dispatch_data *udd;
181 
182         udd = (void *) current->utask->vaddr;
183 
184         base_addr = udd->bp_addr - udd->tu->offset;
185         return base_addr + (unsigned long)file_offset;
186 }
187 
188 #define DEFINE_FETCH_file_offset(type)                                  \
189 static void FETCH_FUNC_NAME(file_offset, type)(struct pt_regs *regs,    \
190                                                void *offset, void *dest)\
191 {                                                                       \
192         void *vaddr = (void *)translate_user_vaddr(offset);             \
193                                                                         \
194         FETCH_FUNC_NAME(memory, type)(regs, vaddr, dest);               \
195 }
196 DEFINE_BASIC_FETCH_FUNCS(file_offset)
197 DEFINE_FETCH_file_offset(string)
198 DEFINE_FETCH_file_offset(string_size)
199 
200 /* Fetch type information table */
201 static const struct fetch_type uprobes_fetch_type_table[] = {
202         /* Special types */
203         [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
204                                         sizeof(u32), 1, "__data_loc char[]"),
205         [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
206                                         string_size, sizeof(u32), 0, "u32"),
207         /* Basic types */
208         ASSIGN_FETCH_TYPE(u8,  u8,  0),
209         ASSIGN_FETCH_TYPE(u16, u16, 0),
210         ASSIGN_FETCH_TYPE(u32, u32, 0),
211         ASSIGN_FETCH_TYPE(u64, u64, 0),
212         ASSIGN_FETCH_TYPE(s8,  u8,  1),
213         ASSIGN_FETCH_TYPE(s16, u16, 1),
214         ASSIGN_FETCH_TYPE(s32, u32, 1),
215         ASSIGN_FETCH_TYPE(s64, u64, 1),
216         ASSIGN_FETCH_TYPE_ALIAS(x8,  u8,  u8,  0),
217         ASSIGN_FETCH_TYPE_ALIAS(x16, u16, u16, 0),
218         ASSIGN_FETCH_TYPE_ALIAS(x32, u32, u32, 0),
219         ASSIGN_FETCH_TYPE_ALIAS(x64, u64, u64, 0),
220 
221         ASSIGN_FETCH_TYPE_END
222 };
223 
224 static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter)
225 {
226         rwlock_init(&filter->rwlock);
227         filter->nr_systemwide = 0;
228         INIT_LIST_HEAD(&filter->perf_events);
229 }
230 
231 static inline bool uprobe_filter_is_empty(struct trace_uprobe_filter *filter)
232 {
233         return !filter->nr_systemwide && list_empty(&filter->perf_events);
234 }
235 
236 static inline bool is_ret_probe(struct trace_uprobe *tu)
237 {
238         return tu->consumer.ret_handler != NULL;
239 }
240 
241 /*
242  * Allocate new trace_uprobe and initialize it (including uprobes).
243  */
244 static struct trace_uprobe *
245 alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
246 {
247         struct trace_uprobe *tu;
248 
249         if (!event || !is_good_name(event))
250                 return ERR_PTR(-EINVAL);
251 
252         if (!group || !is_good_name(group))
253                 return ERR_PTR(-EINVAL);
254 
255         tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL);
256         if (!tu)
257                 return ERR_PTR(-ENOMEM);
258 
259         tu->tp.call.class = &tu->tp.class;
260         tu->tp.call.name = kstrdup(event, GFP_KERNEL);
261         if (!tu->tp.call.name)
262                 goto error;
263 
264         tu->tp.class.system = kstrdup(group, GFP_KERNEL);
265         if (!tu->tp.class.system)
266                 goto error;
267 
268         INIT_LIST_HEAD(&tu->list);
269         INIT_LIST_HEAD(&tu->tp.files);
270         tu->consumer.handler = uprobe_dispatcher;
271         if (is_ret)
272                 tu->consumer.ret_handler = uretprobe_dispatcher;
273         init_trace_uprobe_filter(&tu->filter);
274         return tu;
275 
276 error:
277         kfree(tu->tp.call.name);
278         kfree(tu);
279 
280         return ERR_PTR(-ENOMEM);
281 }
282 
283 static void free_trace_uprobe(struct trace_uprobe *tu)
284 {
285         int i;
286 
287         for (i = 0; i < tu->tp.nr_args; i++)
288                 traceprobe_free_probe_arg(&tu->tp.args[i]);
289 
290         iput(tu->inode);
291         kfree(tu->tp.call.class->system);
292         kfree(tu->tp.call.name);
293         kfree(tu->filename);
294         kfree(tu);
295 }
296 
297 static struct trace_uprobe *find_probe_event(const char *event, const char *group)
298 {
299         struct trace_uprobe *tu;
300 
301         list_for_each_entry(tu, &uprobe_list, list)
302                 if (strcmp(trace_event_name(&tu->tp.call), event) == 0 &&
303                     strcmp(tu->tp.call.class->system, group) == 0)
304                         return tu;
305 
306         return NULL;
307 }
308 
309 /* Unregister a trace_uprobe and probe_event: call with locking uprobe_lock */
310 static int unregister_trace_uprobe(struct trace_uprobe *tu)
311 {
312         int ret;
313 
314         ret = unregister_uprobe_event(tu);
315         if (ret)
316                 return ret;
317 
318         list_del(&tu->list);
319         free_trace_uprobe(tu);
320         return 0;
321 }
322 
323 /* Register a trace_uprobe and probe_event */
324 static int register_trace_uprobe(struct trace_uprobe *tu)
325 {
326         struct trace_uprobe *old_tu;
327         int ret;
328 
329         mutex_lock(&uprobe_lock);
330 
331         /* register as an event */
332         old_tu = find_probe_event(trace_event_name(&tu->tp.call),
333                         tu->tp.call.class->system);
334         if (old_tu) {
335                 /* delete old event */
336                 ret = unregister_trace_uprobe(old_tu);
337                 if (ret)
338                         goto end;
339         }
340 
341         ret = register_uprobe_event(tu);
342         if (ret) {
343                 pr_warn("Failed to register probe event(%d)\n", ret);
344                 goto end;
345         }
346 
347         list_add_tail(&tu->list, &uprobe_list);
348 
349 end:
350         mutex_unlock(&uprobe_lock);
351 
352         return ret;
353 }
354 
355 /*
356  * Argument syntax:
357  *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS]
358  *
359  *  - Remove uprobe: -:[GRP/]EVENT
360  */
361 static int create_trace_uprobe(int argc, char **argv)
362 {
363         struct trace_uprobe *tu;
364         struct inode *inode;
365         char *arg, *event, *group, *filename;
366         char buf[MAX_EVENT_NAME_LEN];
367         struct path path;
368         unsigned long offset;
369         bool is_delete, is_return;
370         int i, ret;
371 
372         inode = NULL;
373         ret = 0;
374         is_delete = false;
375         is_return = false;
376         event = NULL;
377         group = NULL;
378 
379         /* argc must be >= 1 */
380         if (argv[0][0] == '-')
381                 is_delete = true;
382         else if (argv[0][0] == 'r')
383                 is_return = true;
384         else if (argv[0][0] != 'p') {
385                 pr_info("Probe definition must be started with 'p', 'r' or '-'.\n");
386                 return -EINVAL;
387         }
388 
389         if (argv[0][1] == ':') {
390                 event = &argv[0][2];
391                 arg = strchr(event, '/');
392 
393                 if (arg) {
394                         group = event;
395                         event = arg + 1;
396                         event[-1] = '\0';
397 
398                         if (strlen(group) == 0) {
399                                 pr_info("Group name is not specified\n");
400                                 return -EINVAL;
401                         }
402                 }
403                 if (strlen(event) == 0) {
404                         pr_info("Event name is not specified\n");
405                         return -EINVAL;
406                 }
407         }
408         if (!group)
409                 group = UPROBE_EVENT_SYSTEM;
410 
411         if (is_delete) {
412                 int ret;
413 
414                 if (!event) {
415                         pr_info("Delete command needs an event name.\n");
416                         return -EINVAL;
417                 }
418                 mutex_lock(&uprobe_lock);
419                 tu = find_probe_event(event, group);
420 
421                 if (!tu) {
422                         mutex_unlock(&uprobe_lock);
423                         pr_info("Event %s/%s doesn't exist.\n", group, event);
424                         return -ENOENT;
425                 }
426                 /* delete an event */
427                 ret = unregister_trace_uprobe(tu);
428                 mutex_unlock(&uprobe_lock);
429                 return ret;
430         }
431 
432         if (argc < 2) {
433                 pr_info("Probe point is not specified.\n");
434                 return -EINVAL;
435         }
436         /* Find the last occurrence, in case the path contains ':' too. */
437         arg = strrchr(argv[1], ':');
438         if (!arg) {
439                 ret = -EINVAL;
440                 goto fail_address_parse;
441         }
442 
443         *arg++ = '\0';
444         filename = argv[1];
445         ret = kern_path(filename, LOOKUP_FOLLOW, &path);
446         if (ret)
447                 goto fail_address_parse;
448 
449         inode = igrab(d_inode(path.dentry));
450         path_put(&path);
451 
452         if (!inode || !S_ISREG(inode->i_mode)) {
453                 ret = -EINVAL;
454                 goto fail_address_parse;
455         }
456 
457         ret = kstrtoul(arg, 0, &offset);
458         if (ret)
459                 goto fail_address_parse;
460 
461         argc -= 2;
462         argv += 2;
463 
464         /* setup a probe */
465         if (!event) {
466                 char *tail;
467                 char *ptr;
468 
469                 tail = kstrdup(kbasename(filename), GFP_KERNEL);
470                 if (!tail) {
471                         ret = -ENOMEM;
472                         goto fail_address_parse;
473                 }
474 
475                 ptr = strpbrk(tail, ".-_");
476                 if (ptr)
477                         *ptr = '\0';
478 
479                 snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_0x%lx", 'p', tail, offset);
480                 event = buf;
481                 kfree(tail);
482         }
483 
484         tu = alloc_trace_uprobe(group, event, argc, is_return);
485         if (IS_ERR(tu)) {
486                 pr_info("Failed to allocate trace_uprobe.(%d)\n", (int)PTR_ERR(tu));
487                 ret = PTR_ERR(tu);
488                 goto fail_address_parse;
489         }
490         tu->offset = offset;
491         tu->inode = inode;
492         tu->filename = kstrdup(filename, GFP_KERNEL);
493 
494         if (!tu->filename) {
495                 pr_info("Failed to allocate filename.\n");
496                 ret = -ENOMEM;
497                 goto error;
498         }
499 
500         /* parse arguments */
501         ret = 0;
502         for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
503                 struct probe_arg *parg = &tu->tp.args[i];
504 
505                 /* Increment count for freeing args in error case */
506                 tu->tp.nr_args++;
507 
508                 /* Parse argument name */
509                 arg = strchr(argv[i], '=');
510                 if (arg) {
511                         *arg++ = '\0';
512                         parg->name = kstrdup(argv[i], GFP_KERNEL);
513                 } else {
514                         arg = argv[i];
515                         /* If argument name is omitted, set "argN" */
516                         snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
517                         parg->name = kstrdup(buf, GFP_KERNEL);
518                 }
519 
520                 if (!parg->name) {
521                         pr_info("Failed to allocate argument[%d] name.\n", i);
522                         ret = -ENOMEM;
523                         goto error;
524                 }
525 
526                 if (!is_good_name(parg->name)) {
527                         pr_info("Invalid argument[%d] name: %s\n", i, parg->name);
528                         ret = -EINVAL;
529                         goto error;
530                 }
531 
532                 if (traceprobe_conflict_field_name(parg->name, tu->tp.args, i)) {
533                         pr_info("Argument[%d] name '%s' conflicts with "
534                                 "another field.\n", i, argv[i]);
535                         ret = -EINVAL;
536                         goto error;
537                 }
538 
539                 /* Parse fetch argument */
540                 ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg,
541                                                  is_return, false,
542                                                  uprobes_fetch_type_table);
543                 if (ret) {
544                         pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
545                         goto error;
546                 }
547         }
548 
549         ret = register_trace_uprobe(tu);
550         if (ret)
551                 goto error;
552         return 0;
553 
554 error:
555         free_trace_uprobe(tu);
556         return ret;
557 
558 fail_address_parse:
559         iput(inode);
560 
561         pr_info("Failed to parse address or file.\n");
562 
563         return ret;
564 }
565 
566 static int cleanup_all_probes(void)
567 {
568         struct trace_uprobe *tu;
569         int ret = 0;
570 
571         mutex_lock(&uprobe_lock);
572         while (!list_empty(&uprobe_list)) {
573                 tu = list_entry(uprobe_list.next, struct trace_uprobe, list);
574                 ret = unregister_trace_uprobe(tu);
575                 if (ret)
576                         break;
577         }
578         mutex_unlock(&uprobe_lock);
579         return ret;
580 }
581 
582 /* Probes listing interfaces */
583 static void *probes_seq_start(struct seq_file *m, loff_t *pos)
584 {
585         mutex_lock(&uprobe_lock);
586         return seq_list_start(&uprobe_list, *pos);
587 }
588 
589 static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos)
590 {
591         return seq_list_next(v, &uprobe_list, pos);
592 }
593 
594 static void probes_seq_stop(struct seq_file *m, void *v)
595 {
596         mutex_unlock(&uprobe_lock);
597 }
598 
599 static int probes_seq_show(struct seq_file *m, void *v)
600 {
601         struct trace_uprobe *tu = v;
602         char c = is_ret_probe(tu) ? 'r' : 'p';
603         int i;
604 
605         seq_printf(m, "%c:%s/%s", c, tu->tp.call.class->system,
606                         trace_event_name(&tu->tp.call));
607         seq_printf(m, " %s:", tu->filename);
608 
609         /* Don't print "0x  (null)" when offset is 0 */
610         if (tu->offset) {
611                 seq_printf(m, "0x%px", (void *)tu->offset);
612         } else {
613                 switch (sizeof(void *)) {
614                 case 4:
615                         seq_printf(m, "0x00000000");
616                         break;
617                 case 8:
618                 default:
619                         seq_printf(m, "0x0000000000000000");
620                         break;
621                 }
622         }
623 
624         for (i = 0; i < tu->tp.nr_args; i++)
625                 seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm);
626 
627         seq_putc(m, '\n');
628         return 0;
629 }
630 
631 static const struct seq_operations probes_seq_op = {
632         .start  = probes_seq_start,
633         .next   = probes_seq_next,
634         .stop   = probes_seq_stop,
635         .show   = probes_seq_show
636 };
637 
638 static int probes_open(struct inode *inode, struct file *file)
639 {
640         int ret;
641 
642         if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
643                 ret = cleanup_all_probes();
644                 if (ret)
645                         return ret;
646         }
647 
648         return seq_open(file, &probes_seq_op);
649 }
650 
651 static ssize_t probes_write(struct file *file, const char __user *buffer,
652                             size_t count, loff_t *ppos)
653 {
654         return trace_parse_run_command(file, buffer, count, ppos, create_trace_uprobe);
655 }
656 
657 static const struct file_operations uprobe_events_ops = {
658         .owner          = THIS_MODULE,
659         .open           = probes_open,
660         .read           = seq_read,
661         .llseek         = seq_lseek,
662         .release        = seq_release,
663         .write          = probes_write,
664 };
665 
666 /* Probes profiling interfaces */
667 static int probes_profile_seq_show(struct seq_file *m, void *v)
668 {
669         struct trace_uprobe *tu = v;
670 
671         seq_printf(m, "  %s %-44s %15lu\n", tu->filename,
672                         trace_event_name(&tu->tp.call), tu->nhit);
673         return 0;
674 }
675 
676 static const struct seq_operations profile_seq_op = {
677         .start  = probes_seq_start,
678         .next   = probes_seq_next,
679         .stop   = probes_seq_stop,
680         .show   = probes_profile_seq_show
681 };
682 
683 static int profile_open(struct inode *inode, struct file *file)
684 {
685         return seq_open(file, &profile_seq_op);
686 }
687 
688 static const struct file_operations uprobe_profile_ops = {
689         .owner          = THIS_MODULE,
690         .open           = profile_open,
691         .read           = seq_read,
692         .llseek         = seq_lseek,
693         .release        = seq_release,
694 };
695 
696 struct uprobe_cpu_buffer {
697         struct mutex mutex;
698         void *buf;
699 };
700 static struct uprobe_cpu_buffer __percpu *uprobe_cpu_buffer;
701 static int uprobe_buffer_refcnt;
702 
703 static int uprobe_buffer_init(void)
704 {
705         int cpu, err_cpu;
706 
707         uprobe_cpu_buffer = alloc_percpu(struct uprobe_cpu_buffer);
708         if (uprobe_cpu_buffer == NULL)
709                 return -ENOMEM;
710 
711         for_each_possible_cpu(cpu) {
712                 struct page *p = alloc_pages_node(cpu_to_node(cpu),
713                                                   GFP_KERNEL, 0);
714                 if (p == NULL) {
715                         err_cpu = cpu;
716                         goto err;
717                 }
718                 per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf = page_address(p);
719                 mutex_init(&per_cpu_ptr(uprobe_cpu_buffer, cpu)->mutex);
720         }
721 
722         return 0;
723 
724 err:
725         for_each_possible_cpu(cpu) {
726                 if (cpu == err_cpu)
727                         break;
728                 free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf);
729         }
730 
731         free_percpu(uprobe_cpu_buffer);
732         return -ENOMEM;
733 }
734 
735 static int uprobe_buffer_enable(void)
736 {
737         int ret = 0;
738 
739         BUG_ON(!mutex_is_locked(&event_mutex));
740 
741         if (uprobe_buffer_refcnt++ == 0) {
742                 ret = uprobe_buffer_init();
743                 if (ret < 0)
744                         uprobe_buffer_refcnt--;
745         }
746 
747         return ret;
748 }
749 
750 static void uprobe_buffer_disable(void)
751 {
752         int cpu;
753 
754         BUG_ON(!mutex_is_locked(&event_mutex));
755 
756         if (--uprobe_buffer_refcnt == 0) {
757                 for_each_possible_cpu(cpu)
758                         free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer,
759                                                              cpu)->buf);
760 
761                 free_percpu(uprobe_cpu_buffer);
762                 uprobe_cpu_buffer = NULL;
763         }
764 }
765 
766 static struct uprobe_cpu_buffer *uprobe_buffer_get(void)
767 {
768         struct uprobe_cpu_buffer *ucb;
769         int cpu;
770 
771         cpu = raw_smp_processor_id();
772         ucb = per_cpu_ptr(uprobe_cpu_buffer, cpu);
773 
774         /*
775          * Use per-cpu buffers for fastest access, but we might migrate
776          * so the mutex makes sure we have sole access to it.
777          */
778         mutex_lock(&ucb->mutex);
779 
780         return ucb;
781 }
782 
783 static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb)
784 {
785         mutex_unlock(&ucb->mutex);
786 }
787 
788 static void __uprobe_trace_func(struct trace_uprobe *tu,
789                                 unsigned long func, struct pt_regs *regs,
790                                 struct uprobe_cpu_buffer *ucb, int dsize,
791                                 struct trace_event_file *trace_file)
792 {
793         struct uprobe_trace_entry_head *entry;
794         struct ring_buffer_event *event;
795         struct ring_buffer *buffer;
796         void *data;
797         int size, esize;
798         struct trace_event_call *call = &tu->tp.call;
799 
800         WARN_ON(call != trace_file->event_call);
801 
802         if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE))
803                 return;
804 
805         if (trace_trigger_soft_disabled(trace_file))
806                 return;
807 
808         esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
809         size = esize + tu->tp.size + dsize;
810         event = trace_event_buffer_lock_reserve(&buffer, trace_file,
811                                                 call->event.type, size, 0, 0);
812         if (!event)
813                 return;
814 
815         entry = ring_buffer_event_data(event);
816         if (is_ret_probe(tu)) {
817                 entry->vaddr[0] = func;
818                 entry->vaddr[1] = instruction_pointer(regs);
819                 data = DATAOF_TRACE_ENTRY(entry, true);
820         } else {
821                 entry->vaddr[0] = instruction_pointer(regs);
822                 data = DATAOF_TRACE_ENTRY(entry, false);
823         }
824 
825         memcpy(data, ucb->buf, tu->tp.size + dsize);
826 
827         event_trigger_unlock_commit(trace_file, buffer, event, entry, 0, 0);
828 }
829 
830 /* uprobe handler */
831 static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs,
832                              struct uprobe_cpu_buffer *ucb, int dsize)
833 {
834         struct event_file_link *link;
835 
836         if (is_ret_probe(tu))
837                 return 0;
838 
839         rcu_read_lock();
840         list_for_each_entry_rcu(link, &tu->tp.files, list)
841                 __uprobe_trace_func(tu, 0, regs, ucb, dsize, link->file);
842         rcu_read_unlock();
843 
844         return 0;
845 }
846 
847 static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func,
848                                  struct pt_regs *regs,
849                                  struct uprobe_cpu_buffer *ucb, int dsize)
850 {
851         struct event_file_link *link;
852 
853         rcu_read_lock();
854         list_for_each_entry_rcu(link, &tu->tp.files, list)
855                 __uprobe_trace_func(tu, func, regs, ucb, dsize, link->file);
856         rcu_read_unlock();
857 }
858 
859 /* Event entry printers */
860 static enum print_line_t
861 print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event)
862 {
863         struct uprobe_trace_entry_head *entry;
864         struct trace_seq *s = &iter->seq;
865         struct trace_uprobe *tu;
866         u8 *data;
867         int i;
868 
869         entry = (struct uprobe_trace_entry_head *)iter->ent;
870         tu = container_of(event, struct trace_uprobe, tp.call.event);
871 
872         if (is_ret_probe(tu)) {
873                 trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)",
874                                  trace_event_name(&tu->tp.call),
875                                  entry->vaddr[1], entry->vaddr[0]);
876                 data = DATAOF_TRACE_ENTRY(entry, true);
877         } else {
878                 trace_seq_printf(s, "%s: (0x%lx)",
879                                  trace_event_name(&tu->tp.call),
880                                  entry->vaddr[0]);
881                 data = DATAOF_TRACE_ENTRY(entry, false);
882         }
883 
884         for (i = 0; i < tu->tp.nr_args; i++) {
885                 struct probe_arg *parg = &tu->tp.args[i];
886 
887                 if (!parg->type->print(s, parg->name, data + parg->offset, entry))
888                         goto out;
889         }
890 
891         trace_seq_putc(s, '\n');
892 
893  out:
894         return trace_handle_return(s);
895 }
896 
897 typedef bool (*filter_func_t)(struct uprobe_consumer *self,
898                                 enum uprobe_filter_ctx ctx,
899                                 struct mm_struct *mm);
900 
901 static int
902 probe_event_enable(struct trace_uprobe *tu, struct trace_event_file *file,
903                    filter_func_t filter)
904 {
905         bool enabled = trace_probe_is_enabled(&tu->tp);
906         struct event_file_link *link = NULL;
907         int ret;
908 
909         if (file) {
910                 if (tu->tp.flags & TP_FLAG_PROFILE)
911                         return -EINTR;
912 
913                 link = kmalloc(sizeof(*link), GFP_KERNEL);
914                 if (!link)
915                         return -ENOMEM;
916 
917                 link->file = file;
918                 list_add_tail_rcu(&link->list, &tu->tp.files);
919 
920                 tu->tp.flags |= TP_FLAG_TRACE;
921         } else {
922                 if (tu->tp.flags & TP_FLAG_TRACE)
923                         return -EINTR;
924 
925                 tu->tp.flags |= TP_FLAG_PROFILE;
926         }
927 
928         WARN_ON(!uprobe_filter_is_empty(&tu->filter));
929 
930         if (enabled)
931                 return 0;
932 
933         ret = uprobe_buffer_enable();
934         if (ret)
935                 goto err_flags;
936 
937         tu->consumer.filter = filter;
938         ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
939         if (ret)
940                 goto err_buffer;
941 
942         return 0;
943 
944  err_buffer:
945         uprobe_buffer_disable();
946 
947  err_flags:
948         if (file) {
949                 list_del(&link->list);
950                 kfree(link);
951                 tu->tp.flags &= ~TP_FLAG_TRACE;
952         } else {
953                 tu->tp.flags &= ~TP_FLAG_PROFILE;
954         }
955         return ret;
956 }
957 
958 static void
959 probe_event_disable(struct trace_uprobe *tu, struct trace_event_file *file)
960 {
961         if (!trace_probe_is_enabled(&tu->tp))
962                 return;
963 
964         if (file) {
965                 struct event_file_link *link;
966 
967                 link = find_event_file_link(&tu->tp, file);
968                 if (!link)
969                         return;
970 
971                 list_del_rcu(&link->list);
972                 /* synchronize with u{,ret}probe_trace_func */
973                 synchronize_sched();
974                 kfree(link);
975 
976                 if (!list_empty(&tu->tp.files))
977                         return;
978         }
979 
980         WARN_ON(!uprobe_filter_is_empty(&tu->filter));
981 
982         uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
983         tu->tp.flags &= file ? ~TP_FLAG_TRACE : ~TP_FLAG_PROFILE;
984 
985         uprobe_buffer_disable();
986 }
987 
988 static int uprobe_event_define_fields(struct trace_event_call *event_call)
989 {
990         int ret, i, size;
991         struct uprobe_trace_entry_head field;
992         struct trace_uprobe *tu = event_call->data;
993 
994         if (is_ret_probe(tu)) {
995                 DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_FUNC, 0);
996                 DEFINE_FIELD(unsigned long, vaddr[1], FIELD_STRING_RETIP, 0);
997                 size = SIZEOF_TRACE_ENTRY(true);
998         } else {
999                 DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_IP, 0);
1000                 size = SIZEOF_TRACE_ENTRY(false);
1001         }
1002         /* Set argument names as fields */
1003         for (i = 0; i < tu->tp.nr_args; i++) {
1004                 struct probe_arg *parg = &tu->tp.args[i];
1005 
1006                 ret = trace_define_field(event_call, parg->type->fmttype,
1007                                          parg->name, size + parg->offset,
1008                                          parg->type->size, parg->type->is_signed,
1009                                          FILTER_OTHER);
1010 
1011                 if (ret)
1012                         return ret;
1013         }
1014         return 0;
1015 }
1016 
1017 #ifdef CONFIG_PERF_EVENTS
1018 static bool
1019 __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
1020 {
1021         struct perf_event *event;
1022 
1023         if (filter->nr_systemwide)
1024                 return true;
1025 
1026         list_for_each_entry(event, &filter->perf_events, hw.tp_list) {
1027                 if (event->hw.target->mm == mm)
1028                         return true;
1029         }
1030 
1031         return false;
1032 }
1033 
1034 static inline bool
1035 uprobe_filter_event(struct trace_uprobe *tu, struct perf_event *event)
1036 {
1037         return __uprobe_perf_filter(&tu->filter, event->hw.target->mm);
1038 }
1039 
1040 static int uprobe_perf_close(struct trace_uprobe *tu, struct perf_event *event)
1041 {
1042         bool done;
1043 
1044         write_lock(&tu->filter.rwlock);
1045         if (event->hw.target) {
1046                 list_del(&event->hw.tp_list);
1047                 done = tu->filter.nr_systemwide ||
1048                         (event->hw.target->flags & PF_EXITING) ||
1049                         uprobe_filter_event(tu, event);
1050         } else {
1051                 tu->filter.nr_systemwide--;
1052                 done = tu->filter.nr_systemwide;
1053         }
1054         write_unlock(&tu->filter.rwlock);
1055 
1056         if (!done)
1057                 return uprobe_apply(tu->inode, tu->offset, &tu->consumer, false);
1058 
1059         return 0;
1060 }
1061 
1062 static int uprobe_perf_open(struct trace_uprobe *tu, struct perf_event *event)
1063 {
1064         bool done;
1065         int err;
1066 
1067         write_lock(&tu->filter.rwlock);
1068         if (event->hw.target) {
1069                 /*
1070                  * event->parent != NULL means copy_process(), we can avoid
1071                  * uprobe_apply(). current->mm must be probed and we can rely
1072                  * on dup_mmap() which preserves the already installed bp's.
1073                  *
1074                  * attr.enable_on_exec means that exec/mmap will install the
1075                  * breakpoints we need.
1076                  */
1077                 done = tu->filter.nr_systemwide ||
1078                         event->parent || event->attr.enable_on_exec ||
1079                         uprobe_filter_event(tu, event);
1080                 list_add(&event->hw.tp_list, &tu->filter.perf_events);
1081         } else {
1082                 done = tu->filter.nr_systemwide;
1083                 tu->filter.nr_systemwide++;
1084         }
1085         write_unlock(&tu->filter.rwlock);
1086 
1087         err = 0;
1088         if (!done) {
1089                 err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true);
1090                 if (err)
1091                         uprobe_perf_close(tu, event);
1092         }
1093         return err;
1094 }
1095 
1096 static bool uprobe_perf_filter(struct uprobe_consumer *uc,
1097                                 enum uprobe_filter_ctx ctx, struct mm_struct *mm)
1098 {
1099         struct trace_uprobe *tu;
1100         int ret;
1101 
1102         tu = container_of(uc, struct trace_uprobe, consumer);
1103         read_lock(&tu->filter.rwlock);
1104         ret = __uprobe_perf_filter(&tu->filter, mm);
1105         read_unlock(&tu->filter.rwlock);
1106 
1107         return ret;
1108 }
1109 
1110 static void __uprobe_perf_func(struct trace_uprobe *tu,
1111                                unsigned long func, struct pt_regs *regs,
1112                                struct uprobe_cpu_buffer *ucb, int dsize)
1113 {
1114         struct trace_event_call *call = &tu->tp.call;
1115         struct uprobe_trace_entry_head *entry;
1116         struct hlist_head *head;
1117         void *data;
1118         int size, esize;
1119         int rctx;
1120 
1121         if (bpf_prog_array_valid(call) && !trace_call_bpf(call, regs))
1122                 return;
1123 
1124         esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
1125 
1126         size = esize + tu->tp.size + dsize;
1127         size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32);
1128         if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
1129                 return;
1130 
1131         preempt_disable();
1132         head = this_cpu_ptr(call->perf_events);
1133         if (hlist_empty(head))
1134                 goto out;
1135 
1136         entry = perf_trace_buf_alloc(size, NULL, &rctx);
1137         if (!entry)
1138                 goto out;
1139 
1140         if (is_ret_probe(tu)) {
1141                 entry->vaddr[0] = func;
1142                 entry->vaddr[1] = instruction_pointer(regs);
1143                 data = DATAOF_TRACE_ENTRY(entry, true);
1144         } else {
1145                 entry->vaddr[0] = instruction_pointer(regs);
1146                 data = DATAOF_TRACE_ENTRY(entry, false);
1147         }
1148 
1149         memcpy(data, ucb->buf, tu->tp.size + dsize);
1150 
1151         if (size - esize > tu->tp.size + dsize) {
1152                 int len = tu->tp.size + dsize;
1153 
1154                 memset(data + len, 0, size - esize - len);
1155         }
1156 
1157         perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
1158                               head, NULL);
1159  out:
1160         preempt_enable();
1161 }
1162 
1163 /* uprobe profile handler */
1164 static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs,
1165                             struct uprobe_cpu_buffer *ucb, int dsize)
1166 {
1167         if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
1168                 return UPROBE_HANDLER_REMOVE;
1169 
1170         if (!is_ret_probe(tu))
1171                 __uprobe_perf_func(tu, 0, regs, ucb, dsize);
1172         return 0;
1173 }
1174 
1175 static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
1176                                 struct pt_regs *regs,
1177                                 struct uprobe_cpu_buffer *ucb, int dsize)
1178 {
1179         __uprobe_perf_func(tu, func, regs, ucb, dsize);
1180 }
1181 #endif  /* CONFIG_PERF_EVENTS */
1182 
1183 static int
1184 trace_uprobe_register(struct trace_event_call *event, enum trace_reg type,
1185                       void *data)
1186 {
1187         struct trace_uprobe *tu = event->data;
1188         struct trace_event_file *file = data;
1189 
1190         switch (type) {
1191         case TRACE_REG_REGISTER:
1192                 return probe_event_enable(tu, file, NULL);
1193 
1194         case TRACE_REG_UNREGISTER:
1195                 probe_event_disable(tu, file);
1196                 return 0;
1197 
1198 #ifdef CONFIG_PERF_EVENTS
1199         case TRACE_REG_PERF_REGISTER:
1200                 return probe_event_enable(tu, NULL, uprobe_perf_filter);
1201 
1202         case TRACE_REG_PERF_UNREGISTER:
1203                 probe_event_disable(tu, NULL);
1204                 return 0;
1205 
1206         case TRACE_REG_PERF_OPEN:
1207                 return uprobe_perf_open(tu, data);
1208 
1209         case TRACE_REG_PERF_CLOSE:
1210                 return uprobe_perf_close(tu, data);
1211 
1212 #endif
1213         default:
1214                 return 0;
1215         }
1216         return 0;
1217 }
1218 
1219 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
1220 {
1221         struct trace_uprobe *tu;
1222         struct uprobe_dispatch_data udd;
1223         struct uprobe_cpu_buffer *ucb;
1224         int dsize, esize;
1225         int ret = 0;
1226 
1227 
1228         tu = container_of(con, struct trace_uprobe, consumer);
1229         tu->nhit++;
1230 
1231         udd.tu = tu;
1232         udd.bp_addr = instruction_pointer(regs);
1233 
1234         current->utask->vaddr = (unsigned long) &udd;
1235 
1236         if (WARN_ON_ONCE(!uprobe_cpu_buffer))
1237                 return 0;
1238 
1239         dsize = __get_data_size(&tu->tp, regs);
1240         esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
1241 
1242         ucb = uprobe_buffer_get();
1243         store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
1244 
1245         if (tu->tp.flags & TP_FLAG_TRACE)
1246                 ret |= uprobe_trace_func(tu, regs, ucb, dsize);
1247 
1248 #ifdef CONFIG_PERF_EVENTS
1249         if (tu->tp.flags & TP_FLAG_PROFILE)
1250                 ret |= uprobe_perf_func(tu, regs, ucb, dsize);
1251 #endif
1252         uprobe_buffer_put(ucb);
1253         return ret;
1254 }
1255 
1256 static int uretprobe_dispatcher(struct uprobe_consumer *con,
1257                                 unsigned long func, struct pt_regs *regs)
1258 {
1259         struct trace_uprobe *tu;
1260         struct uprobe_dispatch_data udd;
1261         struct uprobe_cpu_buffer *ucb;
1262         int dsize, esize;
1263 
1264         tu = container_of(con, struct trace_uprobe, consumer);
1265 
1266         udd.tu = tu;
1267         udd.bp_addr = func;
1268 
1269         current->utask->vaddr = (unsigned long) &udd;
1270 
1271         if (WARN_ON_ONCE(!uprobe_cpu_buffer))
1272                 return 0;
1273 
1274         dsize = __get_data_size(&tu->tp, regs);
1275         esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
1276 
1277         ucb = uprobe_buffer_get();
1278         store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
1279 
1280         if (tu->tp.flags & TP_FLAG_TRACE)
1281                 uretprobe_trace_func(tu, func, regs, ucb, dsize);
1282 
1283 #ifdef CONFIG_PERF_EVENTS
1284         if (tu->tp.flags & TP_FLAG_PROFILE)
1285                 uretprobe_perf_func(tu, func, regs, ucb, dsize);
1286 #endif
1287         uprobe_buffer_put(ucb);
1288         return 0;
1289 }
1290 
1291 static struct trace_event_functions uprobe_funcs = {
1292         .trace          = print_uprobe_event
1293 };
1294 
1295 static int register_uprobe_event(struct trace_uprobe *tu)
1296 {
1297         struct trace_event_call *call = &tu->tp.call;
1298         int ret;
1299 
1300         /* Initialize trace_event_call */
1301         INIT_LIST_HEAD(&call->class->fields);
1302         call->event.funcs = &uprobe_funcs;
1303         call->class->define_fields = uprobe_event_define_fields;
1304 
1305         if (set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0)
1306                 return -ENOMEM;
1307 
1308         ret = register_trace_event(&call->event);
1309         if (!ret) {
1310                 kfree(call->print_fmt);
1311                 return -ENODEV;
1312         }
1313 
1314         call->flags = TRACE_EVENT_FL_UPROBE;
1315         call->class->reg = trace_uprobe_register;
1316         call->data = tu;
1317         ret = trace_add_event_call(call);
1318 
1319         if (ret) {
1320                 pr_info("Failed to register uprobe event: %s\n",
1321                         trace_event_name(call));
1322                 kfree(call->print_fmt);
1323                 unregister_trace_event(&call->event);
1324         }
1325 
1326         return ret;
1327 }
1328 
1329 static int unregister_uprobe_event(struct trace_uprobe *tu)
1330 {
1331         int ret;
1332 
1333         /* tu->event is unregistered in trace_remove_event_call() */
1334         ret = trace_remove_event_call(&tu->tp.call);
1335         if (ret)
1336                 return ret;
1337         kfree(tu->tp.call.print_fmt);
1338         tu->tp.call.print_fmt = NULL;
1339         return 0;
1340 }
1341 
1342 /* Make a trace interface for controling probe points */
1343 static __init int init_uprobe_trace(void)
1344 {
1345         struct dentry *d_tracer;
1346 
1347         d_tracer = tracing_init_dentry();
1348         if (IS_ERR(d_tracer))
1349                 return 0;
1350 
1351         trace_create_file("uprobe_events", 0644, d_tracer,
1352                                     NULL, &uprobe_events_ops);
1353         /* Profile interface */
1354         trace_create_file("uprobe_profile", 0444, d_tracer,
1355                                     NULL, &uprobe_profile_ops);
1356         return 0;
1357 }
1358 
1359 fs_initcall(init_uprobe_trace);
1360 

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