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

Version: ~ [ linux-5.2 ] ~ [ linux-5.1.16 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.57 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.132 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.184 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.184 ] ~ [ 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-3.16.69 ] ~ [ 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-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ 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 
 21 #include <linux/module.h>
 22 #include <linux/uaccess.h>
 23 #include <linux/uprobes.h>
 24 #include <linux/namei.h>
 25 #include <linux/string.h>
 26 
 27 #include "trace_probe.h"
 28 
 29 #define UPROBE_EVENT_SYSTEM     "uprobes"
 30 
 31 struct uprobe_trace_entry_head {
 32         struct trace_entry      ent;
 33         unsigned long           vaddr[];
 34 };
 35 
 36 #define SIZEOF_TRACE_ENTRY(is_return)                   \
 37         (sizeof(struct uprobe_trace_entry_head) +       \
 38          sizeof(unsigned long) * (is_return ? 2 : 1))
 39 
 40 #define DATAOF_TRACE_ENTRY(entry, is_return)            \
 41         ((void*)(entry) + SIZEOF_TRACE_ENTRY(is_return))
 42 
 43 struct trace_uprobe_filter {
 44         rwlock_t                rwlock;
 45         int                     nr_systemwide;
 46         struct list_head        perf_events;
 47 };
 48 
 49 /*
 50  * uprobe event core functions
 51  */
 52 struct trace_uprobe {
 53         struct list_head                list;
 54         struct trace_uprobe_filter      filter;
 55         struct uprobe_consumer          consumer;
 56         struct inode                    *inode;
 57         char                            *filename;
 58         unsigned long                   offset;
 59         unsigned long                   nhit;
 60         struct trace_probe              tp;
 61 };
 62 
 63 #define SIZEOF_TRACE_UPROBE(n)                          \
 64         (offsetof(struct trace_uprobe, tp.args) +       \
 65         (sizeof(struct probe_arg) * (n)))
 66 
 67 static int register_uprobe_event(struct trace_uprobe *tu);
 68 static int unregister_uprobe_event(struct trace_uprobe *tu);
 69 
 70 static DEFINE_MUTEX(uprobe_lock);
 71 static LIST_HEAD(uprobe_list);
 72 
 73 struct uprobe_dispatch_data {
 74         struct trace_uprobe     *tu;
 75         unsigned long           bp_addr;
 76 };
 77 
 78 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs);
 79 static int uretprobe_dispatcher(struct uprobe_consumer *con,
 80                                 unsigned long func, struct pt_regs *regs);
 81 
 82 #ifdef CONFIG_STACK_GROWSUP
 83 static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n)
 84 {
 85         return addr - (n * sizeof(long));
 86 }
 87 #else
 88 static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n)
 89 {
 90         return addr + (n * sizeof(long));
 91 }
 92 #endif
 93 
 94 static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n)
 95 {
 96         unsigned long ret;
 97         unsigned long addr = user_stack_pointer(regs);
 98 
 99         addr = adjust_stack_addr(addr, n);
100 
101         if (copy_from_user(&ret, (void __force __user *) addr, sizeof(ret)))
102                 return 0;
103 
104         return ret;
105 }
106 
107 /*
108  * Uprobes-specific fetch functions
109  */
110 #define DEFINE_FETCH_stack(type)                                        \
111 static void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,          \
112                                          void *offset, void *dest)      \
113 {                                                                       \
114         *(type *)dest = (type)get_user_stack_nth(regs,                  \
115                                               ((unsigned long)offset)); \
116 }
117 DEFINE_BASIC_FETCH_FUNCS(stack)
118 /* No string on the stack entry */
119 #define fetch_stack_string      NULL
120 #define fetch_stack_string_size NULL
121 
122 #define DEFINE_FETCH_memory(type)                                       \
123 static void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,         \
124                                           void *addr, void *dest)       \
125 {                                                                       \
126         type retval;                                                    \
127         void __user *vaddr = (void __force __user *) addr;              \
128                                                                         \
129         if (copy_from_user(&retval, vaddr, sizeof(type)))               \
130                 *(type *)dest = 0;                                      \
131         else                                                            \
132                 *(type *) dest = retval;                                \
133 }
134 DEFINE_BASIC_FETCH_FUNCS(memory)
135 /*
136  * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
137  * length and relative data location.
138  */
139 static void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
140                                             void *addr, void *dest)
141 {
142         long ret;
143         u32 rloc = *(u32 *)dest;
144         int maxlen  = get_rloc_len(rloc);
145         u8 *dst = get_rloc_data(dest);
146         void __user *src = (void __force __user *) addr;
147 
148         if (!maxlen)
149                 return;
150 
151         ret = strncpy_from_user(dst, src, maxlen);
152 
153         if (ret < 0) {  /* Failed to fetch string */
154                 ((u8 *)get_rloc_data(dest))[0] = '\0';
155                 *(u32 *)dest = make_data_rloc(0, get_rloc_offs(rloc));
156         } else {
157                 *(u32 *)dest = make_data_rloc(ret, get_rloc_offs(rloc));
158         }
159 }
160 
161 static void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
162                                                  void *addr, void *dest)
163 {
164         int len;
165         void __user *vaddr = (void __force __user *) addr;
166 
167         len = strnlen_user(vaddr, MAX_STRING_SIZE);
168 
169         if (len == 0 || len > MAX_STRING_SIZE)  /* Failed to check length */
170                 *(u32 *)dest = 0;
171         else
172                 *(u32 *)dest = len;
173 }
174 
175 static unsigned long translate_user_vaddr(void *file_offset)
176 {
177         unsigned long base_addr;
178         struct uprobe_dispatch_data *udd;
179 
180         udd = (void *) current->utask->vaddr;
181 
182         base_addr = udd->bp_addr - udd->tu->offset;
183         return base_addr + (unsigned long)file_offset;
184 }
185 
186 #define DEFINE_FETCH_file_offset(type)                                  \
187 static void FETCH_FUNC_NAME(file_offset, type)(struct pt_regs *regs,    \
188                                                void *offset, void *dest)\
189 {                                                                       \
190         void *vaddr = (void *)translate_user_vaddr(offset);             \
191                                                                         \
192         FETCH_FUNC_NAME(memory, type)(regs, vaddr, dest);               \
193 }
194 DEFINE_BASIC_FETCH_FUNCS(file_offset)
195 DEFINE_FETCH_file_offset(string)
196 DEFINE_FETCH_file_offset(string_size)
197 
198 /* Fetch type information table */
199 const struct fetch_type uprobes_fetch_type_table[] = {
200         /* Special types */
201         [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
202                                         sizeof(u32), 1, "__data_loc char[]"),
203         [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
204                                         string_size, sizeof(u32), 0, "u32"),
205         /* Basic types */
206         ASSIGN_FETCH_TYPE(u8,  u8,  0),
207         ASSIGN_FETCH_TYPE(u16, u16, 0),
208         ASSIGN_FETCH_TYPE(u32, u32, 0),
209         ASSIGN_FETCH_TYPE(u64, u64, 0),
210         ASSIGN_FETCH_TYPE(s8,  u8,  1),
211         ASSIGN_FETCH_TYPE(s16, u16, 1),
212         ASSIGN_FETCH_TYPE(s32, u32, 1),
213         ASSIGN_FETCH_TYPE(s64, u64, 1),
214 
215         ASSIGN_FETCH_TYPE_END
216 };
217 
218 static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter)
219 {
220         rwlock_init(&filter->rwlock);
221         filter->nr_systemwide = 0;
222         INIT_LIST_HEAD(&filter->perf_events);
223 }
224 
225 static inline bool uprobe_filter_is_empty(struct trace_uprobe_filter *filter)
226 {
227         return !filter->nr_systemwide && list_empty(&filter->perf_events);
228 }
229 
230 static inline bool is_ret_probe(struct trace_uprobe *tu)
231 {
232         return tu->consumer.ret_handler != NULL;
233 }
234 
235 /*
236  * Allocate new trace_uprobe and initialize it (including uprobes).
237  */
238 static struct trace_uprobe *
239 alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
240 {
241         struct trace_uprobe *tu;
242 
243         if (!event || !is_good_name(event))
244                 return ERR_PTR(-EINVAL);
245 
246         if (!group || !is_good_name(group))
247                 return ERR_PTR(-EINVAL);
248 
249         tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL);
250         if (!tu)
251                 return ERR_PTR(-ENOMEM);
252 
253         tu->tp.call.class = &tu->tp.class;
254         tu->tp.call.name = kstrdup(event, GFP_KERNEL);
255         if (!tu->tp.call.name)
256                 goto error;
257 
258         tu->tp.class.system = kstrdup(group, GFP_KERNEL);
259         if (!tu->tp.class.system)
260                 goto error;
261 
262         INIT_LIST_HEAD(&tu->list);
263         INIT_LIST_HEAD(&tu->tp.files);
264         tu->consumer.handler = uprobe_dispatcher;
265         if (is_ret)
266                 tu->consumer.ret_handler = uretprobe_dispatcher;
267         init_trace_uprobe_filter(&tu->filter);
268         return tu;
269 
270 error:
271         kfree(tu->tp.call.name);
272         kfree(tu);
273 
274         return ERR_PTR(-ENOMEM);
275 }
276 
277 static void free_trace_uprobe(struct trace_uprobe *tu)
278 {
279         int i;
280 
281         for (i = 0; i < tu->tp.nr_args; i++)
282                 traceprobe_free_probe_arg(&tu->tp.args[i]);
283 
284         iput(tu->inode);
285         kfree(tu->tp.call.class->system);
286         kfree(tu->tp.call.name);
287         kfree(tu->filename);
288         kfree(tu);
289 }
290 
291 static struct trace_uprobe *find_probe_event(const char *event, const char *group)
292 {
293         struct trace_uprobe *tu;
294 
295         list_for_each_entry(tu, &uprobe_list, list)
296                 if (strcmp(ftrace_event_name(&tu->tp.call), event) == 0 &&
297                     strcmp(tu->tp.call.class->system, group) == 0)
298                         return tu;
299 
300         return NULL;
301 }
302 
303 /* Unregister a trace_uprobe and probe_event: call with locking uprobe_lock */
304 static int unregister_trace_uprobe(struct trace_uprobe *tu)
305 {
306         int ret;
307 
308         ret = unregister_uprobe_event(tu);
309         if (ret)
310                 return ret;
311 
312         list_del(&tu->list);
313         free_trace_uprobe(tu);
314         return 0;
315 }
316 
317 /* Register a trace_uprobe and probe_event */
318 static int register_trace_uprobe(struct trace_uprobe *tu)
319 {
320         struct trace_uprobe *old_tu;
321         int ret;
322 
323         mutex_lock(&uprobe_lock);
324 
325         /* register as an event */
326         old_tu = find_probe_event(ftrace_event_name(&tu->tp.call),
327                         tu->tp.call.class->system);
328         if (old_tu) {
329                 /* delete old event */
330                 ret = unregister_trace_uprobe(old_tu);
331                 if (ret)
332                         goto end;
333         }
334 
335         ret = register_uprobe_event(tu);
336         if (ret) {
337                 pr_warning("Failed to register probe event(%d)\n", ret);
338                 goto end;
339         }
340 
341         list_add_tail(&tu->list, &uprobe_list);
342 
343 end:
344         mutex_unlock(&uprobe_lock);
345 
346         return ret;
347 }
348 
349 /*
350  * Argument syntax:
351  *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS]
352  *
353  *  - Remove uprobe: -:[GRP/]EVENT
354  */
355 static int create_trace_uprobe(int argc, char **argv)
356 {
357         struct trace_uprobe *tu;
358         struct inode *inode;
359         char *arg, *event, *group, *filename;
360         char buf[MAX_EVENT_NAME_LEN];
361         struct path path;
362         unsigned long offset;
363         bool is_delete, is_return;
364         int i, ret;
365 
366         inode = NULL;
367         ret = 0;
368         is_delete = false;
369         is_return = false;
370         event = NULL;
371         group = NULL;
372 
373         /* argc must be >= 1 */
374         if (argv[0][0] == '-')
375                 is_delete = true;
376         else if (argv[0][0] == 'r')
377                 is_return = true;
378         else if (argv[0][0] != 'p') {
379                 pr_info("Probe definition must be started with 'p', 'r' or '-'.\n");
380                 return -EINVAL;
381         }
382 
383         if (argv[0][1] == ':') {
384                 event = &argv[0][2];
385                 arg = strchr(event, '/');
386 
387                 if (arg) {
388                         group = event;
389                         event = arg + 1;
390                         event[-1] = '\0';
391 
392                         if (strlen(group) == 0) {
393                                 pr_info("Group name is not specified\n");
394                                 return -EINVAL;
395                         }
396                 }
397                 if (strlen(event) == 0) {
398                         pr_info("Event name is not specified\n");
399                         return -EINVAL;
400                 }
401         }
402         if (!group)
403                 group = UPROBE_EVENT_SYSTEM;
404 
405         if (is_delete) {
406                 int ret;
407 
408                 if (!event) {
409                         pr_info("Delete command needs an event name.\n");
410                         return -EINVAL;
411                 }
412                 mutex_lock(&uprobe_lock);
413                 tu = find_probe_event(event, group);
414 
415                 if (!tu) {
416                         mutex_unlock(&uprobe_lock);
417                         pr_info("Event %s/%s doesn't exist.\n", group, event);
418                         return -ENOENT;
419                 }
420                 /* delete an event */
421                 ret = unregister_trace_uprobe(tu);
422                 mutex_unlock(&uprobe_lock);
423                 return ret;
424         }
425 
426         if (argc < 2) {
427                 pr_info("Probe point is not specified.\n");
428                 return -EINVAL;
429         }
430         if (isdigit(argv[1][0])) {
431                 pr_info("probe point must be have a filename.\n");
432                 return -EINVAL;
433         }
434         arg = strchr(argv[1], ':');
435         if (!arg) {
436                 ret = -EINVAL;
437                 goto fail_address_parse;
438         }
439 
440         *arg++ = '\0';
441         filename = argv[1];
442         ret = kern_path(filename, LOOKUP_FOLLOW, &path);
443         if (ret)
444                 goto fail_address_parse;
445 
446         inode = igrab(path.dentry->d_inode);
447         path_put(&path);
448 
449         if (!inode || !S_ISREG(inode->i_mode)) {
450                 ret = -EINVAL;
451                 goto fail_address_parse;
452         }
453 
454         ret = kstrtoul(arg, 0, &offset);
455         if (ret)
456                 goto fail_address_parse;
457 
458         argc -= 2;
459         argv += 2;
460 
461         /* setup a probe */
462         if (!event) {
463                 char *tail;
464                 char *ptr;
465 
466                 tail = kstrdup(kbasename(filename), GFP_KERNEL);
467                 if (!tail) {
468                         ret = -ENOMEM;
469                         goto fail_address_parse;
470                 }
471 
472                 ptr = strpbrk(tail, ".-_");
473                 if (ptr)
474                         *ptr = '\0';
475 
476                 snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_0x%lx", 'p', tail, offset);
477                 event = buf;
478                 kfree(tail);
479         }
480 
481         tu = alloc_trace_uprobe(group, event, argc, is_return);
482         if (IS_ERR(tu)) {
483                 pr_info("Failed to allocate trace_uprobe.(%d)\n", (int)PTR_ERR(tu));
484                 ret = PTR_ERR(tu);
485                 goto fail_address_parse;
486         }
487         tu->offset = offset;
488         tu->inode = inode;
489         tu->filename = kstrdup(filename, GFP_KERNEL);
490 
491         if (!tu->filename) {
492                 pr_info("Failed to allocate filename.\n");
493                 ret = -ENOMEM;
494                 goto error;
495         }
496 
497         /* parse arguments */
498         ret = 0;
499         for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
500                 struct probe_arg *parg = &tu->tp.args[i];
501 
502                 /* Increment count for freeing args in error case */
503                 tu->tp.nr_args++;
504 
505                 /* Parse argument name */
506                 arg = strchr(argv[i], '=');
507                 if (arg) {
508                         *arg++ = '\0';
509                         parg->name = kstrdup(argv[i], GFP_KERNEL);
510                 } else {
511                         arg = argv[i];
512                         /* If argument name is omitted, set "argN" */
513                         snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
514                         parg->name = kstrdup(buf, GFP_KERNEL);
515                 }
516 
517                 if (!parg->name) {
518                         pr_info("Failed to allocate argument[%d] name.\n", i);
519                         ret = -ENOMEM;
520                         goto error;
521                 }
522 
523                 if (!is_good_name(parg->name)) {
524                         pr_info("Invalid argument[%d] name: %s\n", i, parg->name);
525                         ret = -EINVAL;
526                         goto error;
527                 }
528 
529                 if (traceprobe_conflict_field_name(parg->name, tu->tp.args, i)) {
530                         pr_info("Argument[%d] name '%s' conflicts with "
531                                 "another field.\n", i, argv[i]);
532                         ret = -EINVAL;
533                         goto error;
534                 }
535 
536                 /* Parse fetch argument */
537                 ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg,
538                                                  is_return, false);
539                 if (ret) {
540                         pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
541                         goto error;
542                 }
543         }
544 
545         ret = register_trace_uprobe(tu);
546         if (ret)
547                 goto error;
548         return 0;
549 
550 error:
551         free_trace_uprobe(tu);
552         return ret;
553 
554 fail_address_parse:
555         iput(inode);
556 
557         pr_info("Failed to parse address or file.\n");
558 
559         return ret;
560 }
561 
562 static int cleanup_all_probes(void)
563 {
564         struct trace_uprobe *tu;
565         int ret = 0;
566 
567         mutex_lock(&uprobe_lock);
568         while (!list_empty(&uprobe_list)) {
569                 tu = list_entry(uprobe_list.next, struct trace_uprobe, list);
570                 ret = unregister_trace_uprobe(tu);
571                 if (ret)
572                         break;
573         }
574         mutex_unlock(&uprobe_lock);
575         return ret;
576 }
577 
578 /* Probes listing interfaces */
579 static void *probes_seq_start(struct seq_file *m, loff_t *pos)
580 {
581         mutex_lock(&uprobe_lock);
582         return seq_list_start(&uprobe_list, *pos);
583 }
584 
585 static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos)
586 {
587         return seq_list_next(v, &uprobe_list, pos);
588 }
589 
590 static void probes_seq_stop(struct seq_file *m, void *v)
591 {
592         mutex_unlock(&uprobe_lock);
593 }
594 
595 static int probes_seq_show(struct seq_file *m, void *v)
596 {
597         struct trace_uprobe *tu = v;
598         char c = is_ret_probe(tu) ? 'r' : 'p';
599         int i;
600 
601         seq_printf(m, "%c:%s/%s", c, tu->tp.call.class->system,
602                         ftrace_event_name(&tu->tp.call));
603         seq_printf(m, " %s:0x%p", tu->filename, (void *)tu->offset);
604 
605         for (i = 0; i < tu->tp.nr_args; i++)
606                 seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm);
607 
608         seq_putc(m, '\n');
609         return 0;
610 }
611 
612 static const struct seq_operations probes_seq_op = {
613         .start  = probes_seq_start,
614         .next   = probes_seq_next,
615         .stop   = probes_seq_stop,
616         .show   = probes_seq_show
617 };
618 
619 static int probes_open(struct inode *inode, struct file *file)
620 {
621         int ret;
622 
623         if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
624                 ret = cleanup_all_probes();
625                 if (ret)
626                         return ret;
627         }
628 
629         return seq_open(file, &probes_seq_op);
630 }
631 
632 static ssize_t probes_write(struct file *file, const char __user *buffer,
633                             size_t count, loff_t *ppos)
634 {
635         return traceprobe_probes_write(file, buffer, count, ppos, create_trace_uprobe);
636 }
637 
638 static const struct file_operations uprobe_events_ops = {
639         .owner          = THIS_MODULE,
640         .open           = probes_open,
641         .read           = seq_read,
642         .llseek         = seq_lseek,
643         .release        = seq_release,
644         .write          = probes_write,
645 };
646 
647 /* Probes profiling interfaces */
648 static int probes_profile_seq_show(struct seq_file *m, void *v)
649 {
650         struct trace_uprobe *tu = v;
651 
652         seq_printf(m, "  %s %-44s %15lu\n", tu->filename,
653                         ftrace_event_name(&tu->tp.call), tu->nhit);
654         return 0;
655 }
656 
657 static const struct seq_operations profile_seq_op = {
658         .start  = probes_seq_start,
659         .next   = probes_seq_next,
660         .stop   = probes_seq_stop,
661         .show   = probes_profile_seq_show
662 };
663 
664 static int profile_open(struct inode *inode, struct file *file)
665 {
666         return seq_open(file, &profile_seq_op);
667 }
668 
669 static const struct file_operations uprobe_profile_ops = {
670         .owner          = THIS_MODULE,
671         .open           = profile_open,
672         .read           = seq_read,
673         .llseek         = seq_lseek,
674         .release        = seq_release,
675 };
676 
677 struct uprobe_cpu_buffer {
678         struct mutex mutex;
679         void *buf;
680 };
681 static struct uprobe_cpu_buffer __percpu *uprobe_cpu_buffer;
682 static int uprobe_buffer_refcnt;
683 
684 static int uprobe_buffer_init(void)
685 {
686         int cpu, err_cpu;
687 
688         uprobe_cpu_buffer = alloc_percpu(struct uprobe_cpu_buffer);
689         if (uprobe_cpu_buffer == NULL)
690                 return -ENOMEM;
691 
692         for_each_possible_cpu(cpu) {
693                 struct page *p = alloc_pages_node(cpu_to_node(cpu),
694                                                   GFP_KERNEL, 0);
695                 if (p == NULL) {
696                         err_cpu = cpu;
697                         goto err;
698                 }
699                 per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf = page_address(p);
700                 mutex_init(&per_cpu_ptr(uprobe_cpu_buffer, cpu)->mutex);
701         }
702 
703         return 0;
704 
705 err:
706         for_each_possible_cpu(cpu) {
707                 if (cpu == err_cpu)
708                         break;
709                 free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf);
710         }
711 
712         free_percpu(uprobe_cpu_buffer);
713         return -ENOMEM;
714 }
715 
716 static int uprobe_buffer_enable(void)
717 {
718         int ret = 0;
719 
720         BUG_ON(!mutex_is_locked(&event_mutex));
721 
722         if (uprobe_buffer_refcnt++ == 0) {
723                 ret = uprobe_buffer_init();
724                 if (ret < 0)
725                         uprobe_buffer_refcnt--;
726         }
727 
728         return ret;
729 }
730 
731 static void uprobe_buffer_disable(void)
732 {
733         int cpu;
734 
735         BUG_ON(!mutex_is_locked(&event_mutex));
736 
737         if (--uprobe_buffer_refcnt == 0) {
738                 for_each_possible_cpu(cpu)
739                         free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer,
740                                                              cpu)->buf);
741 
742                 free_percpu(uprobe_cpu_buffer);
743                 uprobe_cpu_buffer = NULL;
744         }
745 }
746 
747 static struct uprobe_cpu_buffer *uprobe_buffer_get(void)
748 {
749         struct uprobe_cpu_buffer *ucb;
750         int cpu;
751 
752         cpu = raw_smp_processor_id();
753         ucb = per_cpu_ptr(uprobe_cpu_buffer, cpu);
754 
755         /*
756          * Use per-cpu buffers for fastest access, but we might migrate
757          * so the mutex makes sure we have sole access to it.
758          */
759         mutex_lock(&ucb->mutex);
760 
761         return ucb;
762 }
763 
764 static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb)
765 {
766         mutex_unlock(&ucb->mutex);
767 }
768 
769 static void __uprobe_trace_func(struct trace_uprobe *tu,
770                                 unsigned long func, struct pt_regs *regs,
771                                 struct uprobe_cpu_buffer *ucb, int dsize,
772                                 struct ftrace_event_file *ftrace_file)
773 {
774         struct uprobe_trace_entry_head *entry;
775         struct ring_buffer_event *event;
776         struct ring_buffer *buffer;
777         void *data;
778         int size, esize;
779         struct ftrace_event_call *call = &tu->tp.call;
780 
781         WARN_ON(call != ftrace_file->event_call);
782 
783         if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE))
784                 return;
785 
786         if (ftrace_trigger_soft_disabled(ftrace_file))
787                 return;
788 
789         esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
790         size = esize + tu->tp.size + dsize;
791         event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
792                                                 call->event.type, size, 0, 0);
793         if (!event)
794                 return;
795 
796         entry = ring_buffer_event_data(event);
797         if (is_ret_probe(tu)) {
798                 entry->vaddr[0] = func;
799                 entry->vaddr[1] = instruction_pointer(regs);
800                 data = DATAOF_TRACE_ENTRY(entry, true);
801         } else {
802                 entry->vaddr[0] = instruction_pointer(regs);
803                 data = DATAOF_TRACE_ENTRY(entry, false);
804         }
805 
806         memcpy(data, ucb->buf, tu->tp.size + dsize);
807 
808         event_trigger_unlock_commit(ftrace_file, buffer, event, entry, 0, 0);
809 }
810 
811 /* uprobe handler */
812 static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs,
813                              struct uprobe_cpu_buffer *ucb, int dsize)
814 {
815         struct event_file_link *link;
816 
817         if (is_ret_probe(tu))
818                 return 0;
819 
820         rcu_read_lock();
821         list_for_each_entry_rcu(link, &tu->tp.files, list)
822                 __uprobe_trace_func(tu, 0, regs, ucb, dsize, link->file);
823         rcu_read_unlock();
824 
825         return 0;
826 }
827 
828 static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func,
829                                  struct pt_regs *regs,
830                                  struct uprobe_cpu_buffer *ucb, int dsize)
831 {
832         struct event_file_link *link;
833 
834         rcu_read_lock();
835         list_for_each_entry_rcu(link, &tu->tp.files, list)
836                 __uprobe_trace_func(tu, func, regs, ucb, dsize, link->file);
837         rcu_read_unlock();
838 }
839 
840 /* Event entry printers */
841 static enum print_line_t
842 print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event)
843 {
844         struct uprobe_trace_entry_head *entry;
845         struct trace_seq *s = &iter->seq;
846         struct trace_uprobe *tu;
847         u8 *data;
848         int i;
849 
850         entry = (struct uprobe_trace_entry_head *)iter->ent;
851         tu = container_of(event, struct trace_uprobe, tp.call.event);
852 
853         if (is_ret_probe(tu)) {
854                 trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)",
855                                  ftrace_event_name(&tu->tp.call),
856                                  entry->vaddr[1], entry->vaddr[0]);
857                 data = DATAOF_TRACE_ENTRY(entry, true);
858         } else {
859                 trace_seq_printf(s, "%s: (0x%lx)",
860                                  ftrace_event_name(&tu->tp.call),
861                                  entry->vaddr[0]);
862                 data = DATAOF_TRACE_ENTRY(entry, false);
863         }
864 
865         for (i = 0; i < tu->tp.nr_args; i++) {
866                 struct probe_arg *parg = &tu->tp.args[i];
867 
868                 if (!parg->type->print(s, parg->name, data + parg->offset, entry))
869                         goto out;
870         }
871 
872         trace_seq_putc(s, '\n');
873 
874  out:
875         return trace_handle_return(s);
876 }
877 
878 typedef bool (*filter_func_t)(struct uprobe_consumer *self,
879                                 enum uprobe_filter_ctx ctx,
880                                 struct mm_struct *mm);
881 
882 static int
883 probe_event_enable(struct trace_uprobe *tu, struct ftrace_event_file *file,
884                    filter_func_t filter)
885 {
886         bool enabled = trace_probe_is_enabled(&tu->tp);
887         struct event_file_link *link = NULL;
888         int ret;
889 
890         if (file) {
891                 if (tu->tp.flags & TP_FLAG_PROFILE)
892                         return -EINTR;
893 
894                 link = kmalloc(sizeof(*link), GFP_KERNEL);
895                 if (!link)
896                         return -ENOMEM;
897 
898                 link->file = file;
899                 list_add_tail_rcu(&link->list, &tu->tp.files);
900 
901                 tu->tp.flags |= TP_FLAG_TRACE;
902         } else {
903                 if (tu->tp.flags & TP_FLAG_TRACE)
904                         return -EINTR;
905 
906                 tu->tp.flags |= TP_FLAG_PROFILE;
907         }
908 
909         WARN_ON(!uprobe_filter_is_empty(&tu->filter));
910 
911         if (enabled)
912                 return 0;
913 
914         ret = uprobe_buffer_enable();
915         if (ret)
916                 goto err_flags;
917 
918         tu->consumer.filter = filter;
919         ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
920         if (ret)
921                 goto err_buffer;
922 
923         return 0;
924 
925  err_buffer:
926         uprobe_buffer_disable();
927 
928  err_flags:
929         if (file) {
930                 list_del(&link->list);
931                 kfree(link);
932                 tu->tp.flags &= ~TP_FLAG_TRACE;
933         } else {
934                 tu->tp.flags &= ~TP_FLAG_PROFILE;
935         }
936         return ret;
937 }
938 
939 static void
940 probe_event_disable(struct trace_uprobe *tu, struct ftrace_event_file *file)
941 {
942         if (!trace_probe_is_enabled(&tu->tp))
943                 return;
944 
945         if (file) {
946                 struct event_file_link *link;
947 
948                 link = find_event_file_link(&tu->tp, file);
949                 if (!link)
950                         return;
951 
952                 list_del_rcu(&link->list);
953                 /* synchronize with u{,ret}probe_trace_func */
954                 synchronize_sched();
955                 kfree(link);
956 
957                 if (!list_empty(&tu->tp.files))
958                         return;
959         }
960 
961         WARN_ON(!uprobe_filter_is_empty(&tu->filter));
962 
963         uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
964         tu->tp.flags &= file ? ~TP_FLAG_TRACE : ~TP_FLAG_PROFILE;
965 
966         uprobe_buffer_disable();
967 }
968 
969 static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
970 {
971         int ret, i, size;
972         struct uprobe_trace_entry_head field;
973         struct trace_uprobe *tu = event_call->data;
974 
975         if (is_ret_probe(tu)) {
976                 DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_FUNC, 0);
977                 DEFINE_FIELD(unsigned long, vaddr[1], FIELD_STRING_RETIP, 0);
978                 size = SIZEOF_TRACE_ENTRY(true);
979         } else {
980                 DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_IP, 0);
981                 size = SIZEOF_TRACE_ENTRY(false);
982         }
983         /* Set argument names as fields */
984         for (i = 0; i < tu->tp.nr_args; i++) {
985                 struct probe_arg *parg = &tu->tp.args[i];
986 
987                 ret = trace_define_field(event_call, parg->type->fmttype,
988                                          parg->name, size + parg->offset,
989                                          parg->type->size, parg->type->is_signed,
990                                          FILTER_OTHER);
991 
992                 if (ret)
993                         return ret;
994         }
995         return 0;
996 }
997 
998 #ifdef CONFIG_PERF_EVENTS
999 static bool
1000 __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
1001 {
1002         struct perf_event *event;
1003 
1004         if (filter->nr_systemwide)
1005                 return true;
1006 
1007         list_for_each_entry(event, &filter->perf_events, hw.tp_list) {
1008                 if (event->hw.tp_target->mm == mm)
1009                         return true;
1010         }
1011 
1012         return false;
1013 }
1014 
1015 static inline bool
1016 uprobe_filter_event(struct trace_uprobe *tu, struct perf_event *event)
1017 {
1018         return __uprobe_perf_filter(&tu->filter, event->hw.tp_target->mm);
1019 }
1020 
1021 static int uprobe_perf_close(struct trace_uprobe *tu, struct perf_event *event)
1022 {
1023         bool done;
1024 
1025         write_lock(&tu->filter.rwlock);
1026         if (event->hw.tp_target) {
1027                 list_del(&event->hw.tp_list);
1028                 done = tu->filter.nr_systemwide ||
1029                         (event->hw.tp_target->flags & PF_EXITING) ||
1030                         uprobe_filter_event(tu, event);
1031         } else {
1032                 tu->filter.nr_systemwide--;
1033                 done = tu->filter.nr_systemwide;
1034         }
1035         write_unlock(&tu->filter.rwlock);
1036 
1037         if (!done)
1038                 return uprobe_apply(tu->inode, tu->offset, &tu->consumer, false);
1039 
1040         return 0;
1041 }
1042 
1043 static int uprobe_perf_open(struct trace_uprobe *tu, struct perf_event *event)
1044 {
1045         bool done;
1046         int err;
1047 
1048         write_lock(&tu->filter.rwlock);
1049         if (event->hw.tp_target) {
1050                 /*
1051                  * event->parent != NULL means copy_process(), we can avoid
1052                  * uprobe_apply(). current->mm must be probed and we can rely
1053                  * on dup_mmap() which preserves the already installed bp's.
1054                  *
1055                  * attr.enable_on_exec means that exec/mmap will install the
1056                  * breakpoints we need.
1057                  */
1058                 done = tu->filter.nr_systemwide ||
1059                         event->parent || event->attr.enable_on_exec ||
1060                         uprobe_filter_event(tu, event);
1061                 list_add(&event->hw.tp_list, &tu->filter.perf_events);
1062         } else {
1063                 done = tu->filter.nr_systemwide;
1064                 tu->filter.nr_systemwide++;
1065         }
1066         write_unlock(&tu->filter.rwlock);
1067 
1068         err = 0;
1069         if (!done) {
1070                 err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true);
1071                 if (err)
1072                         uprobe_perf_close(tu, event);
1073         }
1074         return err;
1075 }
1076 
1077 static bool uprobe_perf_filter(struct uprobe_consumer *uc,
1078                                 enum uprobe_filter_ctx ctx, struct mm_struct *mm)
1079 {
1080         struct trace_uprobe *tu;
1081         int ret;
1082 
1083         tu = container_of(uc, struct trace_uprobe, consumer);
1084         read_lock(&tu->filter.rwlock);
1085         ret = __uprobe_perf_filter(&tu->filter, mm);
1086         read_unlock(&tu->filter.rwlock);
1087 
1088         return ret;
1089 }
1090 
1091 static void __uprobe_perf_func(struct trace_uprobe *tu,
1092                                unsigned long func, struct pt_regs *regs,
1093                                struct uprobe_cpu_buffer *ucb, int dsize)
1094 {
1095         struct ftrace_event_call *call = &tu->tp.call;
1096         struct uprobe_trace_entry_head *entry;
1097         struct hlist_head *head;
1098         void *data;
1099         int size, esize;
1100         int rctx;
1101 
1102         esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
1103 
1104         size = esize + tu->tp.size + dsize;
1105         size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32);
1106         if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
1107                 return;
1108 
1109         preempt_disable();
1110         head = this_cpu_ptr(call->perf_events);
1111         if (hlist_empty(head))
1112                 goto out;
1113 
1114         entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
1115         if (!entry)
1116                 goto out;
1117 
1118         if (is_ret_probe(tu)) {
1119                 entry->vaddr[0] = func;
1120                 entry->vaddr[1] = instruction_pointer(regs);
1121                 data = DATAOF_TRACE_ENTRY(entry, true);
1122         } else {
1123                 entry->vaddr[0] = instruction_pointer(regs);
1124                 data = DATAOF_TRACE_ENTRY(entry, false);
1125         }
1126 
1127         memcpy(data, ucb->buf, tu->tp.size + dsize);
1128 
1129         if (size - esize > tu->tp.size + dsize) {
1130                 int len = tu->tp.size + dsize;
1131 
1132                 memset(data + len, 0, size - esize - len);
1133         }
1134 
1135         perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
1136  out:
1137         preempt_enable();
1138 }
1139 
1140 /* uprobe profile handler */
1141 static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs,
1142                             struct uprobe_cpu_buffer *ucb, int dsize)
1143 {
1144         if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
1145                 return UPROBE_HANDLER_REMOVE;
1146 
1147         if (!is_ret_probe(tu))
1148                 __uprobe_perf_func(tu, 0, regs, ucb, dsize);
1149         return 0;
1150 }
1151 
1152 static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
1153                                 struct pt_regs *regs,
1154                                 struct uprobe_cpu_buffer *ucb, int dsize)
1155 {
1156         __uprobe_perf_func(tu, func, regs, ucb, dsize);
1157 }
1158 #endif  /* CONFIG_PERF_EVENTS */
1159 
1160 static int
1161 trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type,
1162                       void *data)
1163 {
1164         struct trace_uprobe *tu = event->data;
1165         struct ftrace_event_file *file = data;
1166 
1167         switch (type) {
1168         case TRACE_REG_REGISTER:
1169                 return probe_event_enable(tu, file, NULL);
1170 
1171         case TRACE_REG_UNREGISTER:
1172                 probe_event_disable(tu, file);
1173                 return 0;
1174 
1175 #ifdef CONFIG_PERF_EVENTS
1176         case TRACE_REG_PERF_REGISTER:
1177                 return probe_event_enable(tu, NULL, uprobe_perf_filter);
1178 
1179         case TRACE_REG_PERF_UNREGISTER:
1180                 probe_event_disable(tu, NULL);
1181                 return 0;
1182 
1183         case TRACE_REG_PERF_OPEN:
1184                 return uprobe_perf_open(tu, data);
1185 
1186         case TRACE_REG_PERF_CLOSE:
1187                 return uprobe_perf_close(tu, data);
1188 
1189 #endif
1190         default:
1191                 return 0;
1192         }
1193         return 0;
1194 }
1195 
1196 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
1197 {
1198         struct trace_uprobe *tu;
1199         struct uprobe_dispatch_data udd;
1200         struct uprobe_cpu_buffer *ucb;
1201         int dsize, esize;
1202         int ret = 0;
1203 
1204 
1205         tu = container_of(con, struct trace_uprobe, consumer);
1206         tu->nhit++;
1207 
1208         udd.tu = tu;
1209         udd.bp_addr = instruction_pointer(regs);
1210 
1211         current->utask->vaddr = (unsigned long) &udd;
1212 
1213         if (WARN_ON_ONCE(!uprobe_cpu_buffer))
1214                 return 0;
1215 
1216         dsize = __get_data_size(&tu->tp, regs);
1217         esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
1218 
1219         ucb = uprobe_buffer_get();
1220         store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
1221 
1222         if (tu->tp.flags & TP_FLAG_TRACE)
1223                 ret |= uprobe_trace_func(tu, regs, ucb, dsize);
1224 
1225 #ifdef CONFIG_PERF_EVENTS
1226         if (tu->tp.flags & TP_FLAG_PROFILE)
1227                 ret |= uprobe_perf_func(tu, regs, ucb, dsize);
1228 #endif
1229         uprobe_buffer_put(ucb);
1230         return ret;
1231 }
1232 
1233 static int uretprobe_dispatcher(struct uprobe_consumer *con,
1234                                 unsigned long func, struct pt_regs *regs)
1235 {
1236         struct trace_uprobe *tu;
1237         struct uprobe_dispatch_data udd;
1238         struct uprobe_cpu_buffer *ucb;
1239         int dsize, esize;
1240 
1241         tu = container_of(con, struct trace_uprobe, consumer);
1242 
1243         udd.tu = tu;
1244         udd.bp_addr = func;
1245 
1246         current->utask->vaddr = (unsigned long) &udd;
1247 
1248         if (WARN_ON_ONCE(!uprobe_cpu_buffer))
1249                 return 0;
1250 
1251         dsize = __get_data_size(&tu->tp, regs);
1252         esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
1253 
1254         ucb = uprobe_buffer_get();
1255         store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
1256 
1257         if (tu->tp.flags & TP_FLAG_TRACE)
1258                 uretprobe_trace_func(tu, func, regs, ucb, dsize);
1259 
1260 #ifdef CONFIG_PERF_EVENTS
1261         if (tu->tp.flags & TP_FLAG_PROFILE)
1262                 uretprobe_perf_func(tu, func, regs, ucb, dsize);
1263 #endif
1264         uprobe_buffer_put(ucb);
1265         return 0;
1266 }
1267 
1268 static struct trace_event_functions uprobe_funcs = {
1269         .trace          = print_uprobe_event
1270 };
1271 
1272 static int register_uprobe_event(struct trace_uprobe *tu)
1273 {
1274         struct ftrace_event_call *call = &tu->tp.call;
1275         int ret;
1276 
1277         /* Initialize ftrace_event_call */
1278         INIT_LIST_HEAD(&call->class->fields);
1279         call->event.funcs = &uprobe_funcs;
1280         call->class->define_fields = uprobe_event_define_fields;
1281 
1282         if (set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0)
1283                 return -ENOMEM;
1284 
1285         ret = register_ftrace_event(&call->event);
1286         if (!ret) {
1287                 kfree(call->print_fmt);
1288                 return -ENODEV;
1289         }
1290 
1291         call->class->reg = trace_uprobe_register;
1292         call->data = tu;
1293         ret = trace_add_event_call(call);
1294 
1295         if (ret) {
1296                 pr_info("Failed to register uprobe event: %s\n",
1297                         ftrace_event_name(call));
1298                 kfree(call->print_fmt);
1299                 unregister_ftrace_event(&call->event);
1300         }
1301 
1302         return ret;
1303 }
1304 
1305 static int unregister_uprobe_event(struct trace_uprobe *tu)
1306 {
1307         int ret;
1308 
1309         /* tu->event is unregistered in trace_remove_event_call() */
1310         ret = trace_remove_event_call(&tu->tp.call);
1311         if (ret)
1312                 return ret;
1313         kfree(tu->tp.call.print_fmt);
1314         tu->tp.call.print_fmt = NULL;
1315         return 0;
1316 }
1317 
1318 /* Make a trace interface for controling probe points */
1319 static __init int init_uprobe_trace(void)
1320 {
1321         struct dentry *d_tracer;
1322 
1323         d_tracer = tracing_init_dentry();
1324         if (!d_tracer)
1325                 return 0;
1326 
1327         trace_create_file("uprobe_events", 0644, d_tracer,
1328                                     NULL, &uprobe_events_ops);
1329         /* Profile interface */
1330         trace_create_file("uprobe_profile", 0444, d_tracer,
1331                                     NULL, &uprobe_profile_ops);
1332         return 0;
1333 }
1334 
1335 fs_initcall(init_uprobe_trace);
1336 

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