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