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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" // lsdir(), mkdir_p(), rm_rf()
11#include <dirent.h>
12#include <errno.h>
13#include <stdio.h>
14#include <sys/stat.h>
15#include <sys/types.h>
16#include "util/copyfile.h"
17#include "dso.h"
18#include "build-id.h"
19#include "event.h"
20#include "namespaces.h"
21#include "map.h"
22#include "symbol.h"
23#include "thread.h"
24#include <linux/kernel.h>
25#include "debug.h"
26#include "session.h"
27#include "tool.h"
28#include "header.h"
29#include "vdso.h"
30#include "path.h"
31#include "probe-file.h"
32#include "strlist.h"
33
34#ifdef HAVE_DEBUGINFOD_SUPPORT
35#include <elfutils/debuginfod.h>
36#endif
37
38#include <linux/ctype.h>
39#include <linux/zalloc.h>
40
41static bool no_buildid_cache;
42
43int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
44 union perf_event *event,
45 struct perf_sample *sample,
46 struct evsel *evsel __maybe_unused,
47 struct machine *machine)
48{
49 struct addr_location al;
50 struct thread *thread = machine__findnew_thread(machine, sample->pid,
51 sample->tid);
52
53 if (thread == NULL) {
54 pr_err("problem processing %d event, skipping it.\n",
55 event->header.type);
56 return -1;
57 }
58
59 if (thread__find_map(thread, sample->cpumode, sample->ip, &al))
60 al.map->dso->hit = 1;
61
62 thread__put(thread);
63 return 0;
64}
65
66static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
67 union perf_event *event,
68 struct perf_sample *sample
69 __maybe_unused,
70 struct machine *machine)
71{
72 struct thread *thread = machine__findnew_thread(machine,
73 event->fork.pid,
74 event->fork.tid);
75
76 dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
77 event->fork.ppid, event->fork.ptid);
78
79 if (thread) {
80 machine__remove_thread(machine, thread);
81 thread__put(thread);
82 }
83
84 return 0;
85}
86
87struct perf_tool build_id__mark_dso_hit_ops = {
88 .sample = build_id__mark_dso_hit,
89 .mmap = perf_event__process_mmap,
90 .mmap2 = perf_event__process_mmap2,
91 .fork = perf_event__process_fork,
92 .exit = perf_event__exit_del_thread,
93 .attr = perf_event__process_attr,
94 .build_id = perf_event__process_build_id,
95 .ordered_events = true,
96};
97
98int build_id__sprintf(const u8 *build_id, int len, char *bf)
99{
100 char *bid = bf;
101 const u8 *raw = build_id;
102 int i;
103
104 for (i = 0; i < len; ++i) {
105 sprintf(bid, "%02x", *raw);
106 ++raw;
107 bid += 2;
108 }
109
110 return (bid - bf) + 1;
111}
112
113int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
114{
115 char notes[PATH_MAX];
116 u8 build_id[BUILD_ID_SIZE];
117 int ret;
118
119 if (!root_dir)
120 root_dir = "";
121
122 scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
123
124 ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
125 if (ret < 0)
126 return ret;
127
128 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
129}
130
131int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
132{
133 u8 build_id[BUILD_ID_SIZE];
134 int ret;
135
136 ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
137 if (ret < 0)
138 return ret;
139 else if (ret != sizeof(build_id))
140 return -EINVAL;
141
142 return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
143}
144
145/* asnprintf consolidates asprintf and snprintf */
146static int asnprintf(char **strp, size_t size, const char *fmt, ...)
147{
148 va_list ap;
149 int ret;
150
151 if (!strp)
152 return -EINVAL;
153
154 va_start(ap, fmt);
155 if (*strp)
156 ret = vsnprintf(*strp, size, fmt, ap);
157 else
158 ret = vasprintf(strp, fmt, ap);
159 va_end(ap);
160
161 return ret;
162}
163
164char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
165 size_t size)
166{
167 bool retry_old = true;
168
169 snprintf(bf, size, "%s/%s/%s/kallsyms",
170 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
171retry:
172 if (!access(bf, F_OK))
173 return bf;
174 if (retry_old) {
175 /* Try old style kallsyms cache */
176 snprintf(bf, size, "%s/%s/%s",
177 buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
178 retry_old = false;
179 goto retry;
180 }
181
182 return NULL;
183}
184
185char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
186{
187 char *tmp = bf;
188 int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
189 sbuild_id, sbuild_id + 2);
190 if (ret < 0 || (tmp && size < (unsigned int)ret))
191 return NULL;
192 return bf;
193}
194
195/* The caller is responsible to free the returned buffer. */
196char *build_id_cache__origname(const char *sbuild_id)
197{
198 char *linkname;
199 char buf[PATH_MAX];
200 char *ret = NULL, *p;
201 size_t offs = 5; /* == strlen("../..") */
202 ssize_t len;
203
204 linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
205 if (!linkname)
206 return NULL;
207
208 len = readlink(linkname, buf, sizeof(buf) - 1);
209 if (len <= 0)
210 goto out;
211 buf[len] = '\0';
212
213 /* The link should be "../..<origpath>/<sbuild_id>" */
214 p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
215 if (p && (p > buf + offs)) {
216 *p = '\0';
217 if (buf[offs + 1] == '[')
218 offs++; /*
219 * This is a DSO name, like [kernel.kallsyms].
220 * Skip the first '/', since this is not the
221 * cache of a regular file.
222 */
223 ret = strdup(buf + offs); /* Skip "../..[/]" */
224 }
225out:
226 free(linkname);
227 return ret;
228}
229
230/* Check if the given build_id cache is valid on current running system */
231static bool build_id_cache__valid_id(char *sbuild_id)
232{
233 char real_sbuild_id[SBUILD_ID_SIZE] = "";
234 char *pathname;
235 int ret = 0;
236 bool result = false;
237
238 pathname = build_id_cache__origname(sbuild_id);
239 if (!pathname)
240 return false;
241
242 if (!strcmp(pathname, DSO__NAME_KALLSYMS))
243 ret = sysfs__sprintf_build_id("/", real_sbuild_id);
244 else if (pathname[0] == '/')
245 ret = filename__sprintf_build_id(pathname, real_sbuild_id);
246 else
247 ret = -EINVAL; /* Should we support other special DSO cache? */
248 if (ret >= 0)
249 result = (strcmp(sbuild_id, real_sbuild_id) == 0);
250 free(pathname);
251
252 return result;
253}
254
255static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,
256 bool is_debug)
257{
258 return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ?
259 "debug" : "elf"));
260}
261
262char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
263 bool is_debug)
264{
265 bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
266 bool is_vdso = dso__is_vdso((struct dso *)dso);
267 char sbuild_id[SBUILD_ID_SIZE];
268 char *linkname;
269 bool alloc = (bf == NULL);
270 int ret;
271
272 if (!dso->has_build_id)
273 return NULL;
274
275 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
276 linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
277 if (!linkname)
278 return NULL;
279
280 /* Check if old style build_id cache */
281 if (is_regular_file(linkname))
282 ret = asnprintf(&bf, size, "%s", linkname);
283 else
284 ret = asnprintf(&bf, size, "%s/%s", linkname,
285 build_id_cache__basename(is_kallsyms, is_vdso,
286 is_debug));
287 if (ret < 0 || (!alloc && size < (unsigned int)ret))
288 bf = NULL;
289 free(linkname);
290
291 return bf;
292}
293
294#define dsos__for_each_with_build_id(pos, head) \
295 list_for_each_entry(pos, head, node) \
296 if (!pos->has_build_id) \
297 continue; \
298 else
299
300static int write_buildid(const char *name, size_t name_len, u8 *build_id,
301 pid_t pid, u16 misc, struct feat_fd *fd)
302{
303 int err;
304 struct perf_record_header_build_id b;
305 size_t len;
306
307 len = name_len + 1;
308 len = PERF_ALIGN(len, NAME_ALIGN);
309
310 memset(&b, 0, sizeof(b));
311 memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
312 b.pid = pid;
313 b.header.misc = misc;
314 b.header.size = sizeof(b) + len;
315
316 err = do_write(fd, &b, sizeof(b));
317 if (err < 0)
318 return err;
319
320 return write_padded(fd, name, name_len + 1, len);
321}
322
323static int machine__write_buildid_table(struct machine *machine,
324 struct feat_fd *fd)
325{
326 int err = 0;
327 struct dso *pos;
328 u16 kmisc = PERF_RECORD_MISC_KERNEL,
329 umisc = PERF_RECORD_MISC_USER;
330
331 if (!machine__is_host(machine)) {
332 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
333 umisc = PERF_RECORD_MISC_GUEST_USER;
334 }
335
336 dsos__for_each_with_build_id(pos, &machine->dsos.head) {
337 const char *name;
338 size_t name_len;
339 bool in_kernel = false;
340
341 if (!pos->hit && !dso__is_vdso(pos))
342 continue;
343
344 if (dso__is_vdso(pos)) {
345 name = pos->short_name;
346 name_len = pos->short_name_len;
347 } else if (dso__is_kcore(pos)) {
348 name = machine->mmap_name;
349 name_len = strlen(name);
350 } else {
351 name = pos->long_name;
352 name_len = pos->long_name_len;
353 }
354
355 in_kernel = pos->kernel ||
356 is_kernel_module(name,
357 PERF_RECORD_MISC_CPUMODE_UNKNOWN);
358 err = write_buildid(name, name_len, pos->build_id, machine->pid,
359 in_kernel ? kmisc : umisc, fd);
360 if (err)
361 break;
362 }
363
364 return err;
365}
366
367int perf_session__write_buildid_table(struct perf_session *session,
368 struct feat_fd *fd)
369{
370 struct rb_node *nd;
371 int err = machine__write_buildid_table(&session->machines.host, fd);
372
373 if (err)
374 return err;
375
376 for (nd = rb_first_cached(&session->machines.guests); nd;
377 nd = rb_next(nd)) {
378 struct machine *pos = rb_entry(nd, struct machine, rb_node);
379 err = machine__write_buildid_table(pos, fd);
380 if (err)
381 break;
382 }
383 return err;
384}
385
386static int __dsos__hit_all(struct list_head *head)
387{
388 struct dso *pos;
389
390 list_for_each_entry(pos, head, node)
391 pos->hit = true;
392
393 return 0;
394}
395
396static int machine__hit_all_dsos(struct machine *machine)
397{
398 return __dsos__hit_all(&machine->dsos.head);
399}
400
401int dsos__hit_all(struct perf_session *session)
402{
403 struct rb_node *nd;
404 int err;
405
406 err = machine__hit_all_dsos(&session->machines.host);
407 if (err)
408 return err;
409
410 for (nd = rb_first_cached(&session->machines.guests); nd;
411 nd = rb_next(nd)) {
412 struct machine *pos = rb_entry(nd, struct machine, rb_node);
413
414 err = machine__hit_all_dsos(pos);
415 if (err)
416 return err;
417 }
418
419 return 0;
420}
421
422void disable_buildid_cache(void)
423{
424 no_buildid_cache = true;
425}
426
427static bool lsdir_bid_head_filter(const char *name __maybe_unused,
428 struct dirent *d)
429{
430 return (strlen(d->d_name) == 2) &&
431 isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
432}
433
434static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
435 struct dirent *d)
436{
437 int i = 0;
438 while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
439 i++;
440 return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0');
441}
442
443struct strlist *build_id_cache__list_all(bool validonly)
444{
445 struct strlist *toplist, *linklist = NULL, *bidlist;
446 struct str_node *nd, *nd2;
447 char *topdir, *linkdir = NULL;
448 char sbuild_id[SBUILD_ID_SIZE];
449
450 /* for filename__ functions */
451 if (validonly)
452 symbol__init(NULL);
453
454 /* Open the top-level directory */
455 if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
456 return NULL;
457
458 bidlist = strlist__new(NULL, NULL);
459 if (!bidlist)
460 goto out;
461
462 toplist = lsdir(topdir, lsdir_bid_head_filter);
463 if (!toplist) {
464 pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
465 /* If there is no buildid cache, return an empty list */
466 if (errno == ENOENT)
467 goto out;
468 goto err_out;
469 }
470
471 strlist__for_each_entry(nd, toplist) {
472 if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
473 goto err_out;
474 /* Open the lower-level directory */
475 linklist = lsdir(linkdir, lsdir_bid_tail_filter);
476 if (!linklist) {
477 pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
478 goto err_out;
479 }
480 strlist__for_each_entry(nd2, linklist) {
481 if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
482 nd->s, nd2->s) != SBUILD_ID_SIZE - 1)
483 goto err_out;
484 if (validonly && !build_id_cache__valid_id(sbuild_id))
485 continue;
486 if (strlist__add(bidlist, sbuild_id) < 0)
487 goto err_out;
488 }
489 strlist__delete(linklist);
490 zfree(&linkdir);
491 }
492
493out_free:
494 strlist__delete(toplist);
495out:
496 free(topdir);
497
498 return bidlist;
499
500err_out:
501 strlist__delete(linklist);
502 zfree(&linkdir);
503 strlist__delete(bidlist);
504 bidlist = NULL;
505 goto out_free;
506}
507
508static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
509{
510 size_t i;
511
512 for (i = 0; i < len; i++) {
513 if (!isxdigit(maybe_sbuild_id[i]))
514 return false;
515 }
516 return true;
517}
518
519/* Return the valid complete build-id */
520char *build_id_cache__complement(const char *incomplete_sbuild_id)
521{
522 struct strlist *bidlist;
523 struct str_node *nd, *cand = NULL;
524 char *sbuild_id = NULL;
525 size_t len = strlen(incomplete_sbuild_id);
526
527 if (len >= SBUILD_ID_SIZE ||
528 !str_is_build_id(incomplete_sbuild_id, len))
529 return NULL;
530
531 bidlist = build_id_cache__list_all(true);
532 if (!bidlist)
533 return NULL;
534
535 strlist__for_each_entry(nd, bidlist) {
536 if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
537 continue;
538 if (cand) { /* Error: There are more than 2 candidates. */
539 cand = NULL;
540 break;
541 }
542 cand = nd;
543 }
544 if (cand)
545 sbuild_id = strdup(cand->s);
546 strlist__delete(bidlist);
547
548 return sbuild_id;
549}
550
551char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
552 struct nsinfo *nsi, bool is_kallsyms,
553 bool is_vdso)
554{
555 char *realname = (char *)name, *filename;
556 bool slash = is_kallsyms || is_vdso;
557
558 if (!slash) {
559 realname = nsinfo__realpath(name, nsi);
560 if (!realname)
561 return NULL;
562 }
563
564 if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
565 is_vdso ? DSO__NAME_VDSO : realname,
566 sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
567 filename = NULL;
568
569 if (!slash)
570 free(realname);
571
572 return filename;
573}
574
575int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
576 struct strlist **result)
577{
578 char *dir_name;
579 int ret = 0;
580
581 dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);
582 if (!dir_name)
583 return -ENOMEM;
584
585 *result = lsdir(dir_name, lsdir_no_dot_filter);
586 if (!*result)
587 ret = -errno;
588 free(dir_name);
589
590 return ret;
591}
592
593#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
594static int build_id_cache__add_sdt_cache(const char *sbuild_id,
595 const char *realname,
596 struct nsinfo *nsi)
597{
598 struct probe_cache *cache;
599 int ret;
600 struct nscookie nsc;
601
602 cache = probe_cache__new(sbuild_id, nsi);
603 if (!cache)
604 return -1;
605
606 nsinfo__mountns_enter(nsi, &nsc);
607 ret = probe_cache__scan_sdt(cache, realname);
608 nsinfo__mountns_exit(&nsc);
609 if (ret >= 0) {
610 pr_debug4("Found %d SDTs in %s\n", ret, realname);
611 if (probe_cache__commit(cache) < 0)
612 ret = -1;
613 }
614 probe_cache__delete(cache);
615 return ret;
616}
617#else
618#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)
619#endif
620
621static char *build_id_cache__find_debug(const char *sbuild_id,
622 struct nsinfo *nsi)
623{
624 char *realname = NULL;
625 char *debugfile;
626 struct nscookie nsc;
627 size_t len = 0;
628
629 debugfile = calloc(1, PATH_MAX);
630 if (!debugfile)
631 goto out;
632
633 len = __symbol__join_symfs(debugfile, PATH_MAX,
634 "/usr/lib/debug/.build-id/");
635 snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
636 sbuild_id + 2);
637
638 nsinfo__mountns_enter(nsi, &nsc);
639 realname = realpath(debugfile, NULL);
640 if (realname && access(realname, R_OK))
641 zfree(&realname);
642 nsinfo__mountns_exit(&nsc);
643
644#ifdef HAVE_DEBUGINFOD_SUPPORT
645 if (realname == NULL) {
646 debuginfod_client* c = debuginfod_begin();
647 if (c != NULL) {
648 int fd = debuginfod_find_debuginfo(c,
649 (const unsigned char*)sbuild_id, 0,
650 &realname);
651 if (fd >= 0)
652 close(fd); /* retaining reference by realname */
653 debuginfod_end(c);
654 }
655 }
656#endif
657
658out:
659 free(debugfile);
660 return realname;
661}
662
663int build_id_cache__add_s(const char *sbuild_id, const char *name,
664 struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
665{
666 const size_t size = PATH_MAX;
667 char *realname = NULL, *filename = NULL, *dir_name = NULL,
668 *linkname = zalloc(size), *tmp;
669 char *debugfile = NULL;
670 int err = -1;
671
672 if (!is_kallsyms) {
673 if (!is_vdso)
674 realname = nsinfo__realpath(name, nsi);
675 else
676 realname = realpath(name, NULL);
677 if (!realname)
678 goto out_free;
679 }
680
681 dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms,
682 is_vdso);
683 if (!dir_name)
684 goto out_free;
685
686 /* Remove old style build-id cache */
687 if (is_regular_file(dir_name))
688 if (unlink(dir_name))
689 goto out_free;
690
691 if (mkdir_p(dir_name, 0755))
692 goto out_free;
693
694 /* Save the allocated buildid dirname */
695 if (asprintf(&filename, "%s/%s", dir_name,
696 build_id_cache__basename(is_kallsyms, is_vdso,
697 false)) < 0) {
698 filename = NULL;
699 goto out_free;
700 }
701
702 if (access(filename, F_OK)) {
703 if (is_kallsyms) {
704 if (copyfile("/proc/kallsyms", filename))
705 goto out_free;
706 } else if (nsi && nsi->need_setns) {
707 if (copyfile_ns(name, filename, nsi))
708 goto out_free;
709 } else if (link(realname, filename) && errno != EEXIST &&
710 copyfile(name, filename))
711 goto out_free;
712 }
713
714 /* Some binaries are stripped, but have .debug files with their symbol
715 * table. Check to see if we can locate one of those, since the elf
716 * file itself may not be very useful to users of our tools without a
717 * symtab.
718 */
719 if (!is_kallsyms && !is_vdso &&
720 strncmp(".ko", name + strlen(name) - 3, 3)) {
721 debugfile = build_id_cache__find_debug(sbuild_id, nsi);
722 if (debugfile) {
723 zfree(&filename);
724 if (asprintf(&filename, "%s/%s", dir_name,
725 build_id_cache__basename(false, false, true)) < 0) {
726 filename = NULL;
727 goto out_free;
728 }
729 if (access(filename, F_OK)) {
730 if (nsi && nsi->need_setns) {
731 if (copyfile_ns(debugfile, filename,
732 nsi))
733 goto out_free;
734 } else if (link(debugfile, filename) &&
735 errno != EEXIST &&
736 copyfile(debugfile, filename))
737 goto out_free;
738 }
739 }
740 }
741
742 if (!build_id_cache__linkname(sbuild_id, linkname, size))
743 goto out_free;
744 tmp = strrchr(linkname, '/');
745 *tmp = '\0';
746
747 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
748 goto out_free;
749
750 *tmp = '/';
751 tmp = dir_name + strlen(buildid_dir) - 5;
752 memcpy(tmp, "../..", 5);
753
754 if (symlink(tmp, linkname) == 0)
755 err = 0;
756
757 /* Update SDT cache : error is just warned */
758 if (realname &&
759 build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)
760 pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
761
762out_free:
763 if (!is_kallsyms)
764 free(realname);
765 free(filename);
766 free(debugfile);
767 free(dir_name);
768 free(linkname);
769 return err;
770}
771
772static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
773 const char *name, struct nsinfo *nsi,
774 bool is_kallsyms, bool is_vdso)
775{
776 char sbuild_id[SBUILD_ID_SIZE];
777
778 build_id__sprintf(build_id, build_id_size, sbuild_id);
779
780 return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
781 is_vdso);
782}
783
784bool build_id_cache__cached(const char *sbuild_id)
785{
786 bool ret = false;
787 char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
788
789 if (filename && !access(filename, F_OK))
790 ret = true;
791 free(filename);
792
793 return ret;
794}
795
796int build_id_cache__remove_s(const char *sbuild_id)
797{
798 const size_t size = PATH_MAX;
799 char *filename = zalloc(size),
800 *linkname = zalloc(size), *tmp;
801 int err = -1;
802
803 if (filename == NULL || linkname == NULL)
804 goto out_free;
805
806 if (!build_id_cache__linkname(sbuild_id, linkname, size))
807 goto out_free;
808
809 if (access(linkname, F_OK))
810 goto out_free;
811
812 if (readlink(linkname, filename, size - 1) < 0)
813 goto out_free;
814
815 if (unlink(linkname))
816 goto out_free;
817
818 /*
819 * Since the link is relative, we must make it absolute:
820 */
821 tmp = strrchr(linkname, '/') + 1;
822 snprintf(tmp, size - (tmp - linkname), "%s", filename);
823
824 if (rm_rf(linkname))
825 goto out_free;
826
827 err = 0;
828out_free:
829 free(filename);
830 free(linkname);
831 return err;
832}
833
834static int dso__cache_build_id(struct dso *dso, struct machine *machine)
835{
836 bool is_kallsyms = dso__is_kallsyms(dso);
837 bool is_vdso = dso__is_vdso(dso);
838 const char *name = dso->long_name;
839
840 if (dso__is_kcore(dso)) {
841 is_kallsyms = true;
842 name = machine->mmap_name;
843 }
844 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
845 dso->nsinfo, is_kallsyms, is_vdso);
846}
847
848static int __dsos__cache_build_ids(struct list_head *head,
849 struct machine *machine)
850{
851 struct dso *pos;
852 int err = 0;
853
854 dsos__for_each_with_build_id(pos, head)
855 if (dso__cache_build_id(pos, machine))
856 err = -1;
857
858 return err;
859}
860
861static int machine__cache_build_ids(struct machine *machine)
862{
863 return __dsos__cache_build_ids(&machine->dsos.head, machine);
864}
865
866int perf_session__cache_build_ids(struct perf_session *session)
867{
868 struct rb_node *nd;
869 int ret;
870
871 if (no_buildid_cache)
872 return 0;
873
874 if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
875 return -1;
876
877 ret = machine__cache_build_ids(&session->machines.host);
878
879 for (nd = rb_first_cached(&session->machines.guests); nd;
880 nd = rb_next(nd)) {
881 struct machine *pos = rb_entry(nd, struct machine, rb_node);
882 ret |= machine__cache_build_ids(pos);
883 }
884 return ret ? -1 : 0;
885}
886
887static bool machine__read_build_ids(struct machine *machine, bool with_hits)
888{
889 return __dsos__read_build_ids(&machine->dsos.head, with_hits);
890}
891
892bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
893{
894 struct rb_node *nd;
895 bool ret = machine__read_build_ids(&session->machines.host, with_hits);
896
897 for (nd = rb_first_cached(&session->machines.guests); nd;
898 nd = rb_next(nd)) {
899 struct machine *pos = rb_entry(nd, struct machine, rb_node);
900 ret |= machine__read_build_ids(pos, with_hits);
901 }
902
903 return ret;
904}