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1/*
2 * build-id.c
3 *
4 * build-id support
5 *
6 * Copyright (C) 2009, 2010 Red Hat Inc.
7 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
8 */
9#include "util.h"
10#include <stdio.h>
11#include "build-id.h"
12#include "event.h"
13#include "symbol.h"
14#include <linux/kernel.h>
15#include "debug.h"
16#include "session.h"
17#include "tool.h"
18#include "header.h"
19#include "vdso.h"
20
21
22static bool no_buildid_cache;
23
24int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
25 union perf_event *event,
26 struct perf_sample *sample,
27 struct perf_evsel *evsel __maybe_unused,
28 struct machine *machine)
29{
30 struct addr_location al;
31 struct thread *thread = machine__findnew_thread(machine, sample->pid,
32 sample->tid);
33
34 if (thread == NULL) {
35 pr_err("problem processing %d event, skipping it.\n",
36 event->header.type);
37 return -1;
38 }
39
40 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, &al);
41
42 if (al.map != NULL)
43 al.map->dso->hit = 1;
44
45 thread__put(thread);
46 return 0;
47}
48
49static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
50 union perf_event *event,
51 struct perf_sample *sample
52 __maybe_unused,
53 struct machine *machine)
54{
55 struct thread *thread = machine__findnew_thread(machine,
56 event->fork.pid,
57 event->fork.tid);
58
59 dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
60 event->fork.ppid, event->fork.ptid);
61
62 if (thread) {
63 machine__remove_thread(machine, thread);
64 thread__put(thread);
65 }
66
67 return 0;
68}
69
70struct perf_tool build_id__mark_dso_hit_ops = {
71 .sample = build_id__mark_dso_hit,
72 .mmap = perf_event__process_mmap,
73 .mmap2 = perf_event__process_mmap2,
74 .fork = perf_event__process_fork,
75 .exit = perf_event__exit_del_thread,
76 .attr = perf_event__process_attr,
77 .build_id = perf_event__process_build_id,
78 .ordered_events = true,
79};
80
81int build_id__sprintf(const u8 *build_id, int len, char *bf)
82{
83 char *bid = bf;
84 const u8 *raw = build_id;
85 int i;
86
87 for (i = 0; i < len; ++i) {
88 sprintf(bid, "%02x", *raw);
89 ++raw;
90 bid += 2;
91 }
92
93 return (bid - bf) + 1;
94}
95
96int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
97{
98 char notes[PATH_MAX];
99 u8 build_id[BUILD_ID_SIZE];
100 int ret;
101
102 if (!root_dir)
103 root_dir = "";
104
105 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
106
107 ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
108 if (ret < 0)
109 return ret;
110
111 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
112}
113
114int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
115{
116 u8 build_id[BUILD_ID_SIZE];
117 int ret;
118
119 ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
120 if (ret < 0)
121 return ret;
122 else if (ret != sizeof(build_id))
123 return -EINVAL;
124
125 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
126}
127
128/* asnprintf consolidates asprintf and snprintf */
129static int asnprintf(char **strp, size_t size, const char *fmt, ...)
130{
131 va_list ap;
132 int ret;
133
134 if (!strp)
135 return -EINVAL;
136
137 va_start(ap, fmt);
138 if (*strp)
139 ret = vsnprintf(*strp, size, fmt, ap);
140 else
141 ret = vasprintf(strp, fmt, ap);
142 va_end(ap);
143
144 return ret;
145}
146
147static char *build_id__filename(const char *sbuild_id, char *bf, size_t size)
148{
149 char *tmp = bf;
150 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
151 sbuild_id, sbuild_id + 2);
152 if (ret < 0 || (tmp && size < (unsigned int)ret))
153 return NULL;
154 return bf;
155}
156
157char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
158{
159 char build_id_hex[SBUILD_ID_SIZE];
160
161 if (!dso->has_build_id)
162 return NULL;
163
164 build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex);
165 return build_id__filename(build_id_hex, bf, size);
166}
167
168bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size)
169{
170 char *id_name, *ch;
171 struct stat sb;
172
173 id_name = dso__build_id_filename(dso, bf, size);
174 if (!id_name)
175 goto err;
176 if (access(id_name, F_OK))
177 goto err;
178 if (lstat(id_name, &sb) == -1)
179 goto err;
180 if ((size_t)sb.st_size > size - 1)
181 goto err;
182 if (readlink(id_name, bf, size - 1) < 0)
183 goto err;
184
185 bf[sb.st_size] = '\0';
186
187 /*
188 * link should be:
189 * ../../lib/modules/4.4.0-rc4/kernel/net/ipv4/netfilter/nf_nat_ipv4.ko/a09fe3eb3147dafa4e3b31dbd6257e4d696bdc92
190 */
191 ch = strrchr(bf, '/');
192 if (!ch)
193 goto err;
194 if (ch - 3 < bf)
195 goto err;
196
197 return strncmp(".ko", ch - 3, 3) == 0;
198err:
199 /*
200 * If dso__build_id_filename work, get id_name again,
201 * because id_name points to bf and is broken.
202 */
203 if (id_name)
204 id_name = dso__build_id_filename(dso, bf, size);
205 pr_err("Invalid build id: %s\n", id_name ? :
206 dso->long_name ? :
207 dso->short_name ? :
208 "[unknown]");
209 return false;
210}
211
212#define dsos__for_each_with_build_id(pos, head) \
213 list_for_each_entry(pos, head, node) \
214 if (!pos->has_build_id) \
215 continue; \
216 else
217
218static int write_buildid(const char *name, size_t name_len, u8 *build_id,
219 pid_t pid, u16 misc, int fd)
220{
221 int err;
222 struct build_id_event b;
223 size_t len;
224
225 len = name_len + 1;
226 len = PERF_ALIGN(len, NAME_ALIGN);
227
228 memset(&b, 0, sizeof(b));
229 memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
230 b.pid = pid;
231 b.header.misc = misc;
232 b.header.size = sizeof(b) + len;
233
234 err = writen(fd, &b, sizeof(b));
235 if (err < 0)
236 return err;
237
238 return write_padded(fd, name, name_len + 1, len);
239}
240
241static int machine__write_buildid_table(struct machine *machine, int fd)
242{
243 int err = 0;
244 char nm[PATH_MAX];
245 struct dso *pos;
246 u16 kmisc = PERF_RECORD_MISC_KERNEL,
247 umisc = PERF_RECORD_MISC_USER;
248
249 if (!machine__is_host(machine)) {
250 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
251 umisc = PERF_RECORD_MISC_GUEST_USER;
252 }
253
254 dsos__for_each_with_build_id(pos, &machine->dsos.head) {
255 const char *name;
256 size_t name_len;
257 bool in_kernel = false;
258
259 if (!pos->hit)
260 continue;
261
262 if (dso__is_vdso(pos)) {
263 name = pos->short_name;
264 name_len = pos->short_name_len + 1;
265 } else if (dso__is_kcore(pos)) {
266 machine__mmap_name(machine, nm, sizeof(nm));
267 name = nm;
268 name_len = strlen(nm) + 1;
269 } else {
270 name = pos->long_name;
271 name_len = pos->long_name_len + 1;
272 }
273
274 in_kernel = pos->kernel ||
275 is_kernel_module(name,
276 PERF_RECORD_MISC_CPUMODE_UNKNOWN);
277 err = write_buildid(name, name_len, pos->build_id, machine->pid,
278 in_kernel ? kmisc : umisc, fd);
279 if (err)
280 break;
281 }
282
283 return err;
284}
285
286int perf_session__write_buildid_table(struct perf_session *session, int fd)
287{
288 struct rb_node *nd;
289 int err = machine__write_buildid_table(&session->machines.host, fd);
290
291 if (err)
292 return err;
293
294 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
295 struct machine *pos = rb_entry(nd, struct machine, rb_node);
296 err = machine__write_buildid_table(pos, fd);
297 if (err)
298 break;
299 }
300 return err;
301}
302
303static int __dsos__hit_all(struct list_head *head)
304{
305 struct dso *pos;
306
307 list_for_each_entry(pos, head, node)
308 pos->hit = true;
309
310 return 0;
311}
312
313static int machine__hit_all_dsos(struct machine *machine)
314{
315 return __dsos__hit_all(&machine->dsos.head);
316}
317
318int dsos__hit_all(struct perf_session *session)
319{
320 struct rb_node *nd;
321 int err;
322
323 err = machine__hit_all_dsos(&session->machines.host);
324 if (err)
325 return err;
326
327 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
328 struct machine *pos = rb_entry(nd, struct machine, rb_node);
329
330 err = machine__hit_all_dsos(pos);
331 if (err)
332 return err;
333 }
334
335 return 0;
336}
337
338void disable_buildid_cache(void)
339{
340 no_buildid_cache = true;
341}
342
343static char *build_id_cache__dirname_from_path(const char *name,
344 bool is_kallsyms, bool is_vdso)
345{
346 char *realname = (char *)name, *filename;
347 bool slash = is_kallsyms || is_vdso;
348
349 if (!slash) {
350 realname = realpath(name, NULL);
351 if (!realname)
352 return NULL;
353 }
354
355 if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",
356 is_vdso ? DSO__NAME_VDSO : realname) < 0)
357 filename = NULL;
358
359 if (!slash)
360 free(realname);
361
362 return filename;
363}
364
365int build_id_cache__list_build_ids(const char *pathname,
366 struct strlist **result)
367{
368 struct strlist *list;
369 char *dir_name;
370 DIR *dir;
371 struct dirent *d;
372 int ret = 0;
373
374 list = strlist__new(NULL, NULL);
375 dir_name = build_id_cache__dirname_from_path(pathname, false, false);
376 if (!list || !dir_name) {
377 ret = -ENOMEM;
378 goto out;
379 }
380
381 /* List up all dirents */
382 dir = opendir(dir_name);
383 if (!dir) {
384 ret = -errno;
385 goto out;
386 }
387
388 while ((d = readdir(dir)) != NULL) {
389 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
390 continue;
391 strlist__add(list, d->d_name);
392 }
393 closedir(dir);
394
395out:
396 free(dir_name);
397 if (ret)
398 strlist__delete(list);
399 else
400 *result = list;
401
402 return ret;
403}
404
405int build_id_cache__add_s(const char *sbuild_id, const char *name,
406 bool is_kallsyms, bool is_vdso)
407{
408 const size_t size = PATH_MAX;
409 char *realname = NULL, *filename = NULL, *dir_name = NULL,
410 *linkname = zalloc(size), *targetname, *tmp;
411 int err = -1;
412
413 if (!is_kallsyms) {
414 realname = realpath(name, NULL);
415 if (!realname)
416 goto out_free;
417 }
418
419 dir_name = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);
420 if (!dir_name)
421 goto out_free;
422
423 if (mkdir_p(dir_name, 0755))
424 goto out_free;
425
426 if (asprintf(&filename, "%s/%s", dir_name, sbuild_id) < 0) {
427 filename = NULL;
428 goto out_free;
429 }
430
431 if (access(filename, F_OK)) {
432 if (is_kallsyms) {
433 if (copyfile("/proc/kallsyms", filename))
434 goto out_free;
435 } else if (link(realname, filename) && errno != EEXIST &&
436 copyfile(name, filename))
437 goto out_free;
438 }
439
440 if (!build_id__filename(sbuild_id, linkname, size))
441 goto out_free;
442 tmp = strrchr(linkname, '/');
443 *tmp = '\0';
444
445 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
446 goto out_free;
447
448 *tmp = '/';
449 targetname = filename + strlen(buildid_dir) - 5;
450 memcpy(targetname, "../..", 5);
451
452 if (symlink(targetname, linkname) == 0)
453 err = 0;
454out_free:
455 if (!is_kallsyms)
456 free(realname);
457 free(filename);
458 free(dir_name);
459 free(linkname);
460 return err;
461}
462
463static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
464 const char *name, bool is_kallsyms,
465 bool is_vdso)
466{
467 char sbuild_id[SBUILD_ID_SIZE];
468
469 build_id__sprintf(build_id, build_id_size, sbuild_id);
470
471 return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
472}
473
474bool build_id_cache__cached(const char *sbuild_id)
475{
476 bool ret = false;
477 char *filename = build_id__filename(sbuild_id, NULL, 0);
478
479 if (filename && !access(filename, F_OK))
480 ret = true;
481 free(filename);
482
483 return ret;
484}
485
486int build_id_cache__remove_s(const char *sbuild_id)
487{
488 const size_t size = PATH_MAX;
489 char *filename = zalloc(size),
490 *linkname = zalloc(size), *tmp;
491 int err = -1;
492
493 if (filename == NULL || linkname == NULL)
494 goto out_free;
495
496 if (!build_id__filename(sbuild_id, linkname, size))
497 goto out_free;
498
499 if (access(linkname, F_OK))
500 goto out_free;
501
502 if (readlink(linkname, filename, size - 1) < 0)
503 goto out_free;
504
505 if (unlink(linkname))
506 goto out_free;
507
508 /*
509 * Since the link is relative, we must make it absolute:
510 */
511 tmp = strrchr(linkname, '/') + 1;
512 snprintf(tmp, size - (tmp - linkname), "%s", filename);
513
514 if (unlink(linkname))
515 goto out_free;
516
517 err = 0;
518out_free:
519 free(filename);
520 free(linkname);
521 return err;
522}
523
524static int dso__cache_build_id(struct dso *dso, struct machine *machine)
525{
526 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
527 bool is_vdso = dso__is_vdso(dso);
528 const char *name = dso->long_name;
529 char nm[PATH_MAX];
530
531 if (dso__is_kcore(dso)) {
532 is_kallsyms = true;
533 machine__mmap_name(machine, nm, sizeof(nm));
534 name = nm;
535 }
536 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
537 is_kallsyms, is_vdso);
538}
539
540static int __dsos__cache_build_ids(struct list_head *head,
541 struct machine *machine)
542{
543 struct dso *pos;
544 int err = 0;
545
546 dsos__for_each_with_build_id(pos, head)
547 if (dso__cache_build_id(pos, machine))
548 err = -1;
549
550 return err;
551}
552
553static int machine__cache_build_ids(struct machine *machine)
554{
555 return __dsos__cache_build_ids(&machine->dsos.head, machine);
556}
557
558int perf_session__cache_build_ids(struct perf_session *session)
559{
560 struct rb_node *nd;
561 int ret;
562
563 if (no_buildid_cache)
564 return 0;
565
566 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
567 return -1;
568
569 ret = machine__cache_build_ids(&session->machines.host);
570
571 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
572 struct machine *pos = rb_entry(nd, struct machine, rb_node);
573 ret |= machine__cache_build_ids(pos);
574 }
575 return ret ? -1 : 0;
576}
577
578static bool machine__read_build_ids(struct machine *machine, bool with_hits)
579{
580 return __dsos__read_build_ids(&machine->dsos.head, with_hits);
581}
582
583bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
584{
585 struct rb_node *nd;
586 bool ret = machine__read_build_ids(&session->machines.host, with_hits);
587
588 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
589 struct machine *pos = rb_entry(nd, struct machine, rb_node);
590 ret |= machine__read_build_ids(pos, with_hits);
591 }
592
593 return ret;
594}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * build-id.c
4 *
5 * build-id support
6 *
7 * Copyright (C) 2009, 2010 Red Hat Inc.
8 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
9 */
10#include "util.h"
11#include <dirent.h>
12#include <errno.h>
13#include <stdio.h>
14#include <sys/stat.h>
15#include <sys/types.h>
16#include "build-id.h"
17#include "event.h"
18#include "symbol.h"
19#include "thread.h"
20#include <linux/kernel.h>
21#include "debug.h"
22#include "session.h"
23#include "tool.h"
24#include "header.h"
25#include "vdso.h"
26#include "path.h"
27#include "probe-file.h"
28#include "strlist.h"
29
30#include "sane_ctype.h"
31
32static bool no_buildid_cache;
33
34int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
35 union perf_event *event,
36 struct perf_sample *sample,
37 struct perf_evsel *evsel __maybe_unused,
38 struct machine *machine)
39{
40 struct addr_location al;
41 struct thread *thread = machine__findnew_thread(machine, sample->pid,
42 sample->tid);
43
44 if (thread == NULL) {
45 pr_err("problem processing %d event, skipping it.\n",
46 event->header.type);
47 return -1;
48 }
49
50 thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, &al);
51
52 if (al.map != NULL)
53 al.map->dso->hit = 1;
54
55 thread__put(thread);
56 return 0;
57}
58
59static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
60 union perf_event *event,
61 struct perf_sample *sample
62 __maybe_unused,
63 struct machine *machine)
64{
65 struct thread *thread = machine__findnew_thread(machine,
66 event->fork.pid,
67 event->fork.tid);
68
69 dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
70 event->fork.ppid, event->fork.ptid);
71
72 if (thread) {
73 machine__remove_thread(machine, thread);
74 thread__put(thread);
75 }
76
77 return 0;
78}
79
80struct perf_tool build_id__mark_dso_hit_ops = {
81 .sample = build_id__mark_dso_hit,
82 .mmap = perf_event__process_mmap,
83 .mmap2 = perf_event__process_mmap2,
84 .fork = perf_event__process_fork,
85 .exit = perf_event__exit_del_thread,
86 .attr = perf_event__process_attr,
87 .build_id = perf_event__process_build_id,
88 .ordered_events = true,
89};
90
91int build_id__sprintf(const u8 *build_id, int len, char *bf)
92{
93 char *bid = bf;
94 const u8 *raw = build_id;
95 int i;
96
97 for (i = 0; i < len; ++i) {
98 sprintf(bid, "%02x", *raw);
99 ++raw;
100 bid += 2;
101 }
102
103 return (bid - bf) + 1;
104}
105
106int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
107{
108 char notes[PATH_MAX];
109 u8 build_id[BUILD_ID_SIZE];
110 int ret;
111
112 if (!root_dir)
113 root_dir = "";
114
115 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
116
117 ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
118 if (ret < 0)
119 return ret;
120
121 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
122}
123
124int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
125{
126 u8 build_id[BUILD_ID_SIZE];
127 int ret;
128
129 ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
130 if (ret < 0)
131 return ret;
132 else if (ret != sizeof(build_id))
133 return -EINVAL;
134
135 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
136}
137
138/* asnprintf consolidates asprintf and snprintf */
139static int asnprintf(char **strp, size_t size, const char *fmt, ...)
140{
141 va_list ap;
142 int ret;
143
144 if (!strp)
145 return -EINVAL;
146
147 va_start(ap, fmt);
148 if (*strp)
149 ret = vsnprintf(*strp, size, fmt, ap);
150 else
151 ret = vasprintf(strp, fmt, ap);
152 va_end(ap);
153
154 return ret;
155}
156
157char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
158 size_t size)
159{
160 bool retry_old = true;
161
162 snprintf(bf, size, "%s/%s/%s/kallsyms",
163 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
164retry:
165 if (!access(bf, F_OK))
166 return bf;
167 if (retry_old) {
168 /* Try old style kallsyms cache */
169 snprintf(bf, size, "%s/%s/%s",
170 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
171 retry_old = false;
172 goto retry;
173 }
174
175 return NULL;
176}
177
178char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
179{
180 char *tmp = bf;
181 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
182 sbuild_id, sbuild_id + 2);
183 if (ret < 0 || (tmp && size < (unsigned int)ret))
184 return NULL;
185 return bf;
186}
187
188char *build_id_cache__origname(const char *sbuild_id)
189{
190 char *linkname;
191 char buf[PATH_MAX];
192 char *ret = NULL, *p;
193 size_t offs = 5; /* == strlen("../..") */
194 ssize_t len;
195
196 linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
197 if (!linkname)
198 return NULL;
199
200 len = readlink(linkname, buf, sizeof(buf) - 1);
201 if (len <= 0)
202 goto out;
203 buf[len] = '\0';
204
205 /* The link should be "../..<origpath>/<sbuild_id>" */
206 p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
207 if (p && (p > buf + offs)) {
208 *p = '\0';
209 if (buf[offs + 1] == '[')
210 offs++; /*
211 * This is a DSO name, like [kernel.kallsyms].
212 * Skip the first '/', since this is not the
213 * cache of a regular file.
214 */
215 ret = strdup(buf + offs); /* Skip "../..[/]" */
216 }
217out:
218 free(linkname);
219 return ret;
220}
221
222/* Check if the given build_id cache is valid on current running system */
223static bool build_id_cache__valid_id(char *sbuild_id)
224{
225 char real_sbuild_id[SBUILD_ID_SIZE] = "";
226 char *pathname;
227 int ret = 0;
228 bool result = false;
229
230 pathname = build_id_cache__origname(sbuild_id);
231 if (!pathname)
232 return false;
233
234 if (!strcmp(pathname, DSO__NAME_KALLSYMS))
235 ret = sysfs__sprintf_build_id("/", real_sbuild_id);
236 else if (pathname[0] == '/')
237 ret = filename__sprintf_build_id(pathname, real_sbuild_id);
238 else
239 ret = -EINVAL; /* Should we support other special DSO cache? */
240 if (ret >= 0)
241 result = (strcmp(sbuild_id, real_sbuild_id) == 0);
242 free(pathname);
243
244 return result;
245}
246
247static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,
248 bool is_debug)
249{
250 return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ?
251 "debug" : "elf"));
252}
253
254char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
255 bool is_debug)
256{
257 bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
258 bool is_vdso = dso__is_vdso((struct dso *)dso);
259 char sbuild_id[SBUILD_ID_SIZE];
260 char *linkname;
261 bool alloc = (bf == NULL);
262 int ret;
263
264 if (!dso->has_build_id)
265 return NULL;
266
267 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
268 linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
269 if (!linkname)
270 return NULL;
271
272 /* Check if old style build_id cache */
273 if (is_regular_file(linkname))
274 ret = asnprintf(&bf, size, "%s", linkname);
275 else
276 ret = asnprintf(&bf, size, "%s/%s", linkname,
277 build_id_cache__basename(is_kallsyms, is_vdso,
278 is_debug));
279 if (ret < 0 || (!alloc && size < (unsigned int)ret))
280 bf = NULL;
281 free(linkname);
282
283 return bf;
284}
285
286#define dsos__for_each_with_build_id(pos, head) \
287 list_for_each_entry(pos, head, node) \
288 if (!pos->has_build_id) \
289 continue; \
290 else
291
292static int write_buildid(const char *name, size_t name_len, u8 *build_id,
293 pid_t pid, u16 misc, struct feat_fd *fd)
294{
295 int err;
296 struct build_id_event b;
297 size_t len;
298
299 len = name_len + 1;
300 len = PERF_ALIGN(len, NAME_ALIGN);
301
302 memset(&b, 0, sizeof(b));
303 memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
304 b.pid = pid;
305 b.header.misc = misc;
306 b.header.size = sizeof(b) + len;
307
308 err = do_write(fd, &b, sizeof(b));
309 if (err < 0)
310 return err;
311
312 return write_padded(fd, name, name_len + 1, len);
313}
314
315static int machine__write_buildid_table(struct machine *machine,
316 struct feat_fd *fd)
317{
318 int err = 0;
319 struct dso *pos;
320 u16 kmisc = PERF_RECORD_MISC_KERNEL,
321 umisc = PERF_RECORD_MISC_USER;
322
323 if (!machine__is_host(machine)) {
324 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
325 umisc = PERF_RECORD_MISC_GUEST_USER;
326 }
327
328 dsos__for_each_with_build_id(pos, &machine->dsos.head) {
329 const char *name;
330 size_t name_len;
331 bool in_kernel = false;
332
333 if (!pos->hit && !dso__is_vdso(pos))
334 continue;
335
336 if (dso__is_vdso(pos)) {
337 name = pos->short_name;
338 name_len = pos->short_name_len;
339 } else if (dso__is_kcore(pos)) {
340 name = machine->mmap_name;
341 name_len = strlen(name);
342 } else {
343 name = pos->long_name;
344 name_len = pos->long_name_len;
345 }
346
347 in_kernel = pos->kernel ||
348 is_kernel_module(name,
349 PERF_RECORD_MISC_CPUMODE_UNKNOWN);
350 err = write_buildid(name, name_len, pos->build_id, machine->pid,
351 in_kernel ? kmisc : umisc, fd);
352 if (err)
353 break;
354 }
355
356 return err;
357}
358
359int perf_session__write_buildid_table(struct perf_session *session,
360 struct feat_fd *fd)
361{
362 struct rb_node *nd;
363 int err = machine__write_buildid_table(&session->machines.host, fd);
364
365 if (err)
366 return err;
367
368 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
369 struct machine *pos = rb_entry(nd, struct machine, rb_node);
370 err = machine__write_buildid_table(pos, fd);
371 if (err)
372 break;
373 }
374 return err;
375}
376
377static int __dsos__hit_all(struct list_head *head)
378{
379 struct dso *pos;
380
381 list_for_each_entry(pos, head, node)
382 pos->hit = true;
383
384 return 0;
385}
386
387static int machine__hit_all_dsos(struct machine *machine)
388{
389 return __dsos__hit_all(&machine->dsos.head);
390}
391
392int dsos__hit_all(struct perf_session *session)
393{
394 struct rb_node *nd;
395 int err;
396
397 err = machine__hit_all_dsos(&session->machines.host);
398 if (err)
399 return err;
400
401 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
402 struct machine *pos = rb_entry(nd, struct machine, rb_node);
403
404 err = machine__hit_all_dsos(pos);
405 if (err)
406 return err;
407 }
408
409 return 0;
410}
411
412void disable_buildid_cache(void)
413{
414 no_buildid_cache = true;
415}
416
417static bool lsdir_bid_head_filter(const char *name __maybe_unused,
418 struct dirent *d)
419{
420 return (strlen(d->d_name) == 2) &&
421 isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
422}
423
424static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
425 struct dirent *d)
426{
427 int i = 0;
428 while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
429 i++;
430 return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0');
431}
432
433struct strlist *build_id_cache__list_all(bool validonly)
434{
435 struct strlist *toplist, *linklist = NULL, *bidlist;
436 struct str_node *nd, *nd2;
437 char *topdir, *linkdir = NULL;
438 char sbuild_id[SBUILD_ID_SIZE];
439
440 /* for filename__ functions */
441 if (validonly)
442 symbol__init(NULL);
443
444 /* Open the top-level directory */
445 if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
446 return NULL;
447
448 bidlist = strlist__new(NULL, NULL);
449 if (!bidlist)
450 goto out;
451
452 toplist = lsdir(topdir, lsdir_bid_head_filter);
453 if (!toplist) {
454 pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
455 /* If there is no buildid cache, return an empty list */
456 if (errno == ENOENT)
457 goto out;
458 goto err_out;
459 }
460
461 strlist__for_each_entry(nd, toplist) {
462 if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
463 goto err_out;
464 /* Open the lower-level directory */
465 linklist = lsdir(linkdir, lsdir_bid_tail_filter);
466 if (!linklist) {
467 pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
468 goto err_out;
469 }
470 strlist__for_each_entry(nd2, linklist) {
471 if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
472 nd->s, nd2->s) != SBUILD_ID_SIZE - 1)
473 goto err_out;
474 if (validonly && !build_id_cache__valid_id(sbuild_id))
475 continue;
476 if (strlist__add(bidlist, sbuild_id) < 0)
477 goto err_out;
478 }
479 strlist__delete(linklist);
480 zfree(&linkdir);
481 }
482
483out_free:
484 strlist__delete(toplist);
485out:
486 free(topdir);
487
488 return bidlist;
489
490err_out:
491 strlist__delete(linklist);
492 zfree(&linkdir);
493 strlist__delete(bidlist);
494 bidlist = NULL;
495 goto out_free;
496}
497
498static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
499{
500 size_t i;
501
502 for (i = 0; i < len; i++) {
503 if (!isxdigit(maybe_sbuild_id[i]))
504 return false;
505 }
506 return true;
507}
508
509/* Return the valid complete build-id */
510char *build_id_cache__complement(const char *incomplete_sbuild_id)
511{
512 struct strlist *bidlist;
513 struct str_node *nd, *cand = NULL;
514 char *sbuild_id = NULL;
515 size_t len = strlen(incomplete_sbuild_id);
516
517 if (len >= SBUILD_ID_SIZE ||
518 !str_is_build_id(incomplete_sbuild_id, len))
519 return NULL;
520
521 bidlist = build_id_cache__list_all(true);
522 if (!bidlist)
523 return NULL;
524
525 strlist__for_each_entry(nd, bidlist) {
526 if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
527 continue;
528 if (cand) { /* Error: There are more than 2 candidates. */
529 cand = NULL;
530 break;
531 }
532 cand = nd;
533 }
534 if (cand)
535 sbuild_id = strdup(cand->s);
536 strlist__delete(bidlist);
537
538 return sbuild_id;
539}
540
541char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
542 struct nsinfo *nsi, bool is_kallsyms,
543 bool is_vdso)
544{
545 char *realname = (char *)name, *filename;
546 bool slash = is_kallsyms || is_vdso;
547
548 if (!slash) {
549 realname = nsinfo__realpath(name, nsi);
550 if (!realname)
551 return NULL;
552 }
553
554 if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
555 is_vdso ? DSO__NAME_VDSO : realname,
556 sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
557 filename = NULL;
558
559 if (!slash)
560 free(realname);
561
562 return filename;
563}
564
565int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
566 struct strlist **result)
567{
568 char *dir_name;
569 int ret = 0;
570
571 dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);
572 if (!dir_name)
573 return -ENOMEM;
574
575 *result = lsdir(dir_name, lsdir_no_dot_filter);
576 if (!*result)
577 ret = -errno;
578 free(dir_name);
579
580 return ret;
581}
582
583#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
584static int build_id_cache__add_sdt_cache(const char *sbuild_id,
585 const char *realname,
586 struct nsinfo *nsi)
587{
588 struct probe_cache *cache;
589 int ret;
590 struct nscookie nsc;
591
592 cache = probe_cache__new(sbuild_id, nsi);
593 if (!cache)
594 return -1;
595
596 nsinfo__mountns_enter(nsi, &nsc);
597 ret = probe_cache__scan_sdt(cache, realname);
598 nsinfo__mountns_exit(&nsc);
599 if (ret >= 0) {
600 pr_debug4("Found %d SDTs in %s\n", ret, realname);
601 if (probe_cache__commit(cache) < 0)
602 ret = -1;
603 }
604 probe_cache__delete(cache);
605 return ret;
606}
607#else
608#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)
609#endif
610
611static char *build_id_cache__find_debug(const char *sbuild_id,
612 struct nsinfo *nsi)
613{
614 char *realname = NULL;
615 char *debugfile;
616 struct nscookie nsc;
617 size_t len = 0;
618
619 debugfile = calloc(1, PATH_MAX);
620 if (!debugfile)
621 goto out;
622
623 len = __symbol__join_symfs(debugfile, PATH_MAX,
624 "/usr/lib/debug/.build-id/");
625 snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
626 sbuild_id + 2);
627
628 nsinfo__mountns_enter(nsi, &nsc);
629 realname = realpath(debugfile, NULL);
630 if (realname && access(realname, R_OK))
631 zfree(&realname);
632 nsinfo__mountns_exit(&nsc);
633out:
634 free(debugfile);
635 return realname;
636}
637
638int build_id_cache__add_s(const char *sbuild_id, const char *name,
639 struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
640{
641 const size_t size = PATH_MAX;
642 char *realname = NULL, *filename = NULL, *dir_name = NULL,
643 *linkname = zalloc(size), *tmp;
644 char *debugfile = NULL;
645 int err = -1;
646
647 if (!is_kallsyms) {
648 if (!is_vdso)
649 realname = nsinfo__realpath(name, nsi);
650 else
651 realname = realpath(name, NULL);
652 if (!realname)
653 goto out_free;
654 }
655
656 dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms,
657 is_vdso);
658 if (!dir_name)
659 goto out_free;
660
661 /* Remove old style build-id cache */
662 if (is_regular_file(dir_name))
663 if (unlink(dir_name))
664 goto out_free;
665
666 if (mkdir_p(dir_name, 0755))
667 goto out_free;
668
669 /* Save the allocated buildid dirname */
670 if (asprintf(&filename, "%s/%s", dir_name,
671 build_id_cache__basename(is_kallsyms, is_vdso,
672 false)) < 0) {
673 filename = NULL;
674 goto out_free;
675 }
676
677 if (access(filename, F_OK)) {
678 if (is_kallsyms) {
679 if (copyfile("/proc/kallsyms", filename))
680 goto out_free;
681 } else if (nsi && nsi->need_setns) {
682 if (copyfile_ns(name, filename, nsi))
683 goto out_free;
684 } else if (link(realname, filename) && errno != EEXIST &&
685 copyfile(name, filename))
686 goto out_free;
687 }
688
689 /* Some binaries are stripped, but have .debug files with their symbol
690 * table. Check to see if we can locate one of those, since the elf
691 * file itself may not be very useful to users of our tools without a
692 * symtab.
693 */
694 if (!is_kallsyms && !is_vdso &&
695 strncmp(".ko", name + strlen(name) - 3, 3)) {
696 debugfile = build_id_cache__find_debug(sbuild_id, nsi);
697 if (debugfile) {
698 zfree(&filename);
699 if (asprintf(&filename, "%s/%s", dir_name,
700 build_id_cache__basename(false, false, true)) < 0) {
701 filename = NULL;
702 goto out_free;
703 }
704 if (access(filename, F_OK)) {
705 if (nsi && nsi->need_setns) {
706 if (copyfile_ns(debugfile, filename,
707 nsi))
708 goto out_free;
709 } else if (link(debugfile, filename) &&
710 errno != EEXIST &&
711 copyfile(debugfile, filename))
712 goto out_free;
713 }
714 }
715 }
716
717 if (!build_id_cache__linkname(sbuild_id, linkname, size))
718 goto out_free;
719 tmp = strrchr(linkname, '/');
720 *tmp = '\0';
721
722 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
723 goto out_free;
724
725 *tmp = '/';
726 tmp = dir_name + strlen(buildid_dir) - 5;
727 memcpy(tmp, "../..", 5);
728
729 if (symlink(tmp, linkname) == 0)
730 err = 0;
731
732 /* Update SDT cache : error is just warned */
733 if (realname &&
734 build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)
735 pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
736
737out_free:
738 if (!is_kallsyms)
739 free(realname);
740 free(filename);
741 free(debugfile);
742 free(dir_name);
743 free(linkname);
744 return err;
745}
746
747static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
748 const char *name, struct nsinfo *nsi,
749 bool is_kallsyms, bool is_vdso)
750{
751 char sbuild_id[SBUILD_ID_SIZE];
752
753 build_id__sprintf(build_id, build_id_size, sbuild_id);
754
755 return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
756 is_vdso);
757}
758
759bool build_id_cache__cached(const char *sbuild_id)
760{
761 bool ret = false;
762 char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
763
764 if (filename && !access(filename, F_OK))
765 ret = true;
766 free(filename);
767
768 return ret;
769}
770
771int build_id_cache__remove_s(const char *sbuild_id)
772{
773 const size_t size = PATH_MAX;
774 char *filename = zalloc(size),
775 *linkname = zalloc(size), *tmp;
776 int err = -1;
777
778 if (filename == NULL || linkname == NULL)
779 goto out_free;
780
781 if (!build_id_cache__linkname(sbuild_id, linkname, size))
782 goto out_free;
783
784 if (access(linkname, F_OK))
785 goto out_free;
786
787 if (readlink(linkname, filename, size - 1) < 0)
788 goto out_free;
789
790 if (unlink(linkname))
791 goto out_free;
792
793 /*
794 * Since the link is relative, we must make it absolute:
795 */
796 tmp = strrchr(linkname, '/') + 1;
797 snprintf(tmp, size - (tmp - linkname), "%s", filename);
798
799 if (rm_rf(linkname))
800 goto out_free;
801
802 err = 0;
803out_free:
804 free(filename);
805 free(linkname);
806 return err;
807}
808
809static int dso__cache_build_id(struct dso *dso, struct machine *machine)
810{
811 bool is_kallsyms = dso__is_kallsyms(dso);
812 bool is_vdso = dso__is_vdso(dso);
813 const char *name = dso->long_name;
814
815 if (dso__is_kcore(dso)) {
816 is_kallsyms = true;
817 name = machine->mmap_name;
818 }
819 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
820 dso->nsinfo, is_kallsyms, is_vdso);
821}
822
823static int __dsos__cache_build_ids(struct list_head *head,
824 struct machine *machine)
825{
826 struct dso *pos;
827 int err = 0;
828
829 dsos__for_each_with_build_id(pos, head)
830 if (dso__cache_build_id(pos, machine))
831 err = -1;
832
833 return err;
834}
835
836static int machine__cache_build_ids(struct machine *machine)
837{
838 return __dsos__cache_build_ids(&machine->dsos.head, machine);
839}
840
841int perf_session__cache_build_ids(struct perf_session *session)
842{
843 struct rb_node *nd;
844 int ret;
845
846 if (no_buildid_cache)
847 return 0;
848
849 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
850 return -1;
851
852 ret = machine__cache_build_ids(&session->machines.host);
853
854 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
855 struct machine *pos = rb_entry(nd, struct machine, rb_node);
856 ret |= machine__cache_build_ids(pos);
857 }
858 return ret ? -1 : 0;
859}
860
861static bool machine__read_build_ids(struct machine *machine, bool with_hits)
862{
863 return __dsos__read_build_ids(&machine->dsos.head, with_hits);
864}
865
866bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
867{
868 struct rb_node *nd;
869 bool ret = machine__read_build_ids(&session->machines.host, with_hits);
870
871 for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
872 struct machine *pos = rb_entry(nd, struct machine, rb_node);
873 ret |= machine__read_build_ids(pos, with_hits);
874 }
875
876 return ret;
877}