mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 03:42:52 +00:00
b0a323c7f0
We do not store size with build ids in perf data, but there's enough space to do it. Adding misc bit PERF_RECORD_MISC_BUILD_ID_SIZE to mark build id event with size. With this fix the dso with md5 build id will have correct build id data and will be usable for debuginfod processing if needed (coming in following patches). Committer notes: Use %zu with size_t to fix this error on 32-bit arches: util/header.c: In function '__event_process_build_id': util/header.c:2105:3: error: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t' [-Werror=format=] pr_debug("build id event received for %s: %s [%lu]\n", ^ Signed-off-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/r/20201013192441.1299447-8-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
913 lines
21 KiB
C
913 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* build-id.c
|
|
*
|
|
* build-id support
|
|
*
|
|
* Copyright (C) 2009, 2010 Red Hat Inc.
|
|
* Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
*/
|
|
#include "util.h" // lsdir(), mkdir_p(), rm_rf()
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include "util/copyfile.h"
|
|
#include "dso.h"
|
|
#include "build-id.h"
|
|
#include "event.h"
|
|
#include "namespaces.h"
|
|
#include "map.h"
|
|
#include "symbol.h"
|
|
#include "thread.h"
|
|
#include <linux/kernel.h>
|
|
#include "debug.h"
|
|
#include "session.h"
|
|
#include "tool.h"
|
|
#include "header.h"
|
|
#include "vdso.h"
|
|
#include "path.h"
|
|
#include "probe-file.h"
|
|
#include "strlist.h"
|
|
|
|
#ifdef HAVE_DEBUGINFOD_SUPPORT
|
|
#include <elfutils/debuginfod.h>
|
|
#endif
|
|
|
|
#include <linux/ctype.h>
|
|
#include <linux/zalloc.h>
|
|
#include <asm/bug.h>
|
|
|
|
static bool no_buildid_cache;
|
|
|
|
int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct evsel *evsel __maybe_unused,
|
|
struct machine *machine)
|
|
{
|
|
struct addr_location al;
|
|
struct thread *thread = machine__findnew_thread(machine, sample->pid,
|
|
sample->tid);
|
|
|
|
if (thread == NULL) {
|
|
pr_err("problem processing %d event, skipping it.\n",
|
|
event->header.type);
|
|
return -1;
|
|
}
|
|
|
|
if (thread__find_map(thread, sample->cpumode, sample->ip, &al))
|
|
al.map->dso->hit = 1;
|
|
|
|
thread__put(thread);
|
|
return 0;
|
|
}
|
|
|
|
static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample
|
|
__maybe_unused,
|
|
struct machine *machine)
|
|
{
|
|
struct thread *thread = machine__findnew_thread(machine,
|
|
event->fork.pid,
|
|
event->fork.tid);
|
|
|
|
dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
|
|
event->fork.ppid, event->fork.ptid);
|
|
|
|
if (thread) {
|
|
machine__remove_thread(machine, thread);
|
|
thread__put(thread);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct perf_tool build_id__mark_dso_hit_ops = {
|
|
.sample = build_id__mark_dso_hit,
|
|
.mmap = perf_event__process_mmap,
|
|
.mmap2 = perf_event__process_mmap2,
|
|
.fork = perf_event__process_fork,
|
|
.exit = perf_event__exit_del_thread,
|
|
.attr = perf_event__process_attr,
|
|
.build_id = perf_event__process_build_id,
|
|
.ordered_events = true,
|
|
};
|
|
|
|
int build_id__sprintf(const struct build_id *build_id, char *bf)
|
|
{
|
|
char *bid = bf;
|
|
const u8 *raw = build_id->data;
|
|
size_t i;
|
|
|
|
for (i = 0; i < build_id->size; ++i) {
|
|
sprintf(bid, "%02x", *raw);
|
|
++raw;
|
|
bid += 2;
|
|
}
|
|
|
|
return (bid - bf) + 1;
|
|
}
|
|
|
|
int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
|
|
{
|
|
char notes[PATH_MAX];
|
|
struct build_id bid;
|
|
int ret;
|
|
|
|
if (!root_dir)
|
|
root_dir = "";
|
|
|
|
scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
|
|
|
|
ret = sysfs__read_build_id(notes, &bid);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return build_id__sprintf(&bid, sbuild_id);
|
|
}
|
|
|
|
int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
|
|
{
|
|
struct build_id bid;
|
|
int ret;
|
|
|
|
ret = filename__read_build_id(pathname, &bid);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return build_id__sprintf(&bid, sbuild_id);
|
|
}
|
|
|
|
/* asnprintf consolidates asprintf and snprintf */
|
|
static int asnprintf(char **strp, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
if (!strp)
|
|
return -EINVAL;
|
|
|
|
va_start(ap, fmt);
|
|
if (*strp)
|
|
ret = vsnprintf(*strp, size, fmt, ap);
|
|
else
|
|
ret = vasprintf(strp, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
|
|
size_t size)
|
|
{
|
|
bool retry_old = true;
|
|
|
|
snprintf(bf, size, "%s/%s/%s/kallsyms",
|
|
buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
|
|
retry:
|
|
if (!access(bf, F_OK))
|
|
return bf;
|
|
if (retry_old) {
|
|
/* Try old style kallsyms cache */
|
|
snprintf(bf, size, "%s/%s/%s",
|
|
buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
|
|
retry_old = false;
|
|
goto retry;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
|
|
{
|
|
char *tmp = bf;
|
|
int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
|
|
sbuild_id, sbuild_id + 2);
|
|
if (ret < 0 || (tmp && size < (unsigned int)ret))
|
|
return NULL;
|
|
return bf;
|
|
}
|
|
|
|
/* The caller is responsible to free the returned buffer. */
|
|
char *build_id_cache__origname(const char *sbuild_id)
|
|
{
|
|
char *linkname;
|
|
char buf[PATH_MAX];
|
|
char *ret = NULL, *p;
|
|
size_t offs = 5; /* == strlen("../..") */
|
|
ssize_t len;
|
|
|
|
linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
if (!linkname)
|
|
return NULL;
|
|
|
|
len = readlink(linkname, buf, sizeof(buf) - 1);
|
|
if (len <= 0)
|
|
goto out;
|
|
buf[len] = '\0';
|
|
|
|
/* The link should be "../..<origpath>/<sbuild_id>" */
|
|
p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
|
|
if (p && (p > buf + offs)) {
|
|
*p = '\0';
|
|
if (buf[offs + 1] == '[')
|
|
offs++; /*
|
|
* This is a DSO name, like [kernel.kallsyms].
|
|
* Skip the first '/', since this is not the
|
|
* cache of a regular file.
|
|
*/
|
|
ret = strdup(buf + offs); /* Skip "../..[/]" */
|
|
}
|
|
out:
|
|
free(linkname);
|
|
return ret;
|
|
}
|
|
|
|
/* Check if the given build_id cache is valid on current running system */
|
|
static bool build_id_cache__valid_id(char *sbuild_id)
|
|
{
|
|
char real_sbuild_id[SBUILD_ID_SIZE] = "";
|
|
char *pathname;
|
|
int ret = 0;
|
|
bool result = false;
|
|
|
|
pathname = build_id_cache__origname(sbuild_id);
|
|
if (!pathname)
|
|
return false;
|
|
|
|
if (!strcmp(pathname, DSO__NAME_KALLSYMS))
|
|
ret = sysfs__sprintf_build_id("/", real_sbuild_id);
|
|
else if (pathname[0] == '/')
|
|
ret = filename__sprintf_build_id(pathname, real_sbuild_id);
|
|
else
|
|
ret = -EINVAL; /* Should we support other special DSO cache? */
|
|
if (ret >= 0)
|
|
result = (strcmp(sbuild_id, real_sbuild_id) == 0);
|
|
free(pathname);
|
|
|
|
return result;
|
|
}
|
|
|
|
static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,
|
|
bool is_debug)
|
|
{
|
|
return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ?
|
|
"debug" : "elf"));
|
|
}
|
|
|
|
char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
|
|
bool is_debug)
|
|
{
|
|
bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
|
|
bool is_vdso = dso__is_vdso((struct dso *)dso);
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
char *linkname;
|
|
bool alloc = (bf == NULL);
|
|
int ret;
|
|
|
|
if (!dso->has_build_id)
|
|
return NULL;
|
|
|
|
build_id__sprintf(&dso->bid, sbuild_id);
|
|
linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
if (!linkname)
|
|
return NULL;
|
|
|
|
/* Check if old style build_id cache */
|
|
if (is_regular_file(linkname))
|
|
ret = asnprintf(&bf, size, "%s", linkname);
|
|
else
|
|
ret = asnprintf(&bf, size, "%s/%s", linkname,
|
|
build_id_cache__basename(is_kallsyms, is_vdso,
|
|
is_debug));
|
|
if (ret < 0 || (!alloc && size < (unsigned int)ret))
|
|
bf = NULL;
|
|
free(linkname);
|
|
|
|
return bf;
|
|
}
|
|
|
|
#define dsos__for_each_with_build_id(pos, head) \
|
|
list_for_each_entry(pos, head, node) \
|
|
if (!pos->has_build_id) \
|
|
continue; \
|
|
else
|
|
|
|
static int write_buildid(const char *name, size_t name_len, struct build_id *bid,
|
|
pid_t pid, u16 misc, struct feat_fd *fd)
|
|
{
|
|
int err;
|
|
struct perf_record_header_build_id b;
|
|
size_t len;
|
|
|
|
len = name_len + 1;
|
|
len = PERF_ALIGN(len, NAME_ALIGN);
|
|
|
|
memset(&b, 0, sizeof(b));
|
|
memcpy(&b.data, bid->data, bid->size);
|
|
b.size = (u8) bid->size;
|
|
misc |= PERF_RECORD_MISC_BUILD_ID_SIZE;
|
|
b.pid = pid;
|
|
b.header.misc = misc;
|
|
b.header.size = sizeof(b) + len;
|
|
|
|
err = do_write(fd, &b, sizeof(b));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return write_padded(fd, name, name_len + 1, len);
|
|
}
|
|
|
|
static int machine__write_buildid_table(struct machine *machine,
|
|
struct feat_fd *fd)
|
|
{
|
|
int err = 0;
|
|
struct dso *pos;
|
|
u16 kmisc = PERF_RECORD_MISC_KERNEL,
|
|
umisc = PERF_RECORD_MISC_USER;
|
|
|
|
if (!machine__is_host(machine)) {
|
|
kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
|
|
umisc = PERF_RECORD_MISC_GUEST_USER;
|
|
}
|
|
|
|
dsos__for_each_with_build_id(pos, &machine->dsos.head) {
|
|
const char *name;
|
|
size_t name_len;
|
|
bool in_kernel = false;
|
|
|
|
if (!pos->hit && !dso__is_vdso(pos))
|
|
continue;
|
|
|
|
if (dso__is_vdso(pos)) {
|
|
name = pos->short_name;
|
|
name_len = pos->short_name_len;
|
|
} else if (dso__is_kcore(pos)) {
|
|
name = machine->mmap_name;
|
|
name_len = strlen(name);
|
|
} else {
|
|
name = pos->long_name;
|
|
name_len = pos->long_name_len;
|
|
}
|
|
|
|
in_kernel = pos->kernel ||
|
|
is_kernel_module(name,
|
|
PERF_RECORD_MISC_CPUMODE_UNKNOWN);
|
|
err = write_buildid(name, name_len, &pos->bid, machine->pid,
|
|
in_kernel ? kmisc : umisc, fd);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int perf_session__write_buildid_table(struct perf_session *session,
|
|
struct feat_fd *fd)
|
|
{
|
|
struct rb_node *nd;
|
|
int err = machine__write_buildid_table(&session->machines.host, fd);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
err = machine__write_buildid_table(pos, fd);
|
|
if (err)
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int __dsos__hit_all(struct list_head *head)
|
|
{
|
|
struct dso *pos;
|
|
|
|
list_for_each_entry(pos, head, node)
|
|
pos->hit = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int machine__hit_all_dsos(struct machine *machine)
|
|
{
|
|
return __dsos__hit_all(&machine->dsos.head);
|
|
}
|
|
|
|
int dsos__hit_all(struct perf_session *session)
|
|
{
|
|
struct rb_node *nd;
|
|
int err;
|
|
|
|
err = machine__hit_all_dsos(&session->machines.host);
|
|
if (err)
|
|
return err;
|
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
|
|
err = machine__hit_all_dsos(pos);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void disable_buildid_cache(void)
|
|
{
|
|
no_buildid_cache = true;
|
|
}
|
|
|
|
static bool lsdir_bid_head_filter(const char *name __maybe_unused,
|
|
struct dirent *d)
|
|
{
|
|
return (strlen(d->d_name) == 2) &&
|
|
isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
|
|
}
|
|
|
|
static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
|
|
struct dirent *d)
|
|
{
|
|
int i = 0;
|
|
while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
|
|
i++;
|
|
return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0');
|
|
}
|
|
|
|
struct strlist *build_id_cache__list_all(bool validonly)
|
|
{
|
|
struct strlist *toplist, *linklist = NULL, *bidlist;
|
|
struct str_node *nd, *nd2;
|
|
char *topdir, *linkdir = NULL;
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
/* for filename__ functions */
|
|
if (validonly)
|
|
symbol__init(NULL);
|
|
|
|
/* Open the top-level directory */
|
|
if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
|
|
return NULL;
|
|
|
|
bidlist = strlist__new(NULL, NULL);
|
|
if (!bidlist)
|
|
goto out;
|
|
|
|
toplist = lsdir(topdir, lsdir_bid_head_filter);
|
|
if (!toplist) {
|
|
pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
|
|
/* If there is no buildid cache, return an empty list */
|
|
if (errno == ENOENT)
|
|
goto out;
|
|
goto err_out;
|
|
}
|
|
|
|
strlist__for_each_entry(nd, toplist) {
|
|
if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
|
|
goto err_out;
|
|
/* Open the lower-level directory */
|
|
linklist = lsdir(linkdir, lsdir_bid_tail_filter);
|
|
if (!linklist) {
|
|
pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
|
|
goto err_out;
|
|
}
|
|
strlist__for_each_entry(nd2, linklist) {
|
|
if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
|
|
nd->s, nd2->s) != SBUILD_ID_SIZE - 1)
|
|
goto err_out;
|
|
if (validonly && !build_id_cache__valid_id(sbuild_id))
|
|
continue;
|
|
if (strlist__add(bidlist, sbuild_id) < 0)
|
|
goto err_out;
|
|
}
|
|
strlist__delete(linklist);
|
|
zfree(&linkdir);
|
|
}
|
|
|
|
out_free:
|
|
strlist__delete(toplist);
|
|
out:
|
|
free(topdir);
|
|
|
|
return bidlist;
|
|
|
|
err_out:
|
|
strlist__delete(linklist);
|
|
zfree(&linkdir);
|
|
strlist__delete(bidlist);
|
|
bidlist = NULL;
|
|
goto out_free;
|
|
}
|
|
|
|
static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (!isxdigit(maybe_sbuild_id[i]))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Return the valid complete build-id */
|
|
char *build_id_cache__complement(const char *incomplete_sbuild_id)
|
|
{
|
|
struct strlist *bidlist;
|
|
struct str_node *nd, *cand = NULL;
|
|
char *sbuild_id = NULL;
|
|
size_t len = strlen(incomplete_sbuild_id);
|
|
|
|
if (len >= SBUILD_ID_SIZE ||
|
|
!str_is_build_id(incomplete_sbuild_id, len))
|
|
return NULL;
|
|
|
|
bidlist = build_id_cache__list_all(true);
|
|
if (!bidlist)
|
|
return NULL;
|
|
|
|
strlist__for_each_entry(nd, bidlist) {
|
|
if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
|
|
continue;
|
|
if (cand) { /* Error: There are more than 2 candidates. */
|
|
cand = NULL;
|
|
break;
|
|
}
|
|
cand = nd;
|
|
}
|
|
if (cand)
|
|
sbuild_id = strdup(cand->s);
|
|
strlist__delete(bidlist);
|
|
|
|
return sbuild_id;
|
|
}
|
|
|
|
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
|
|
struct nsinfo *nsi, bool is_kallsyms,
|
|
bool is_vdso)
|
|
{
|
|
char *realname = (char *)name, *filename;
|
|
bool slash = is_kallsyms || is_vdso;
|
|
|
|
if (!slash) {
|
|
realname = nsinfo__realpath(name, nsi);
|
|
if (!realname)
|
|
return NULL;
|
|
}
|
|
|
|
if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
|
|
is_vdso ? DSO__NAME_VDSO : realname,
|
|
sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
|
|
filename = NULL;
|
|
|
|
if (!slash)
|
|
free(realname);
|
|
|
|
return filename;
|
|
}
|
|
|
|
int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
|
|
struct strlist **result)
|
|
{
|
|
char *dir_name;
|
|
int ret = 0;
|
|
|
|
dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);
|
|
if (!dir_name)
|
|
return -ENOMEM;
|
|
|
|
*result = lsdir(dir_name, lsdir_no_dot_filter);
|
|
if (!*result)
|
|
ret = -errno;
|
|
free(dir_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
|
|
static int build_id_cache__add_sdt_cache(const char *sbuild_id,
|
|
const char *realname,
|
|
struct nsinfo *nsi)
|
|
{
|
|
struct probe_cache *cache;
|
|
int ret;
|
|
struct nscookie nsc;
|
|
|
|
cache = probe_cache__new(sbuild_id, nsi);
|
|
if (!cache)
|
|
return -1;
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
ret = probe_cache__scan_sdt(cache, realname);
|
|
nsinfo__mountns_exit(&nsc);
|
|
if (ret >= 0) {
|
|
pr_debug4("Found %d SDTs in %s\n", ret, realname);
|
|
if (probe_cache__commit(cache) < 0)
|
|
ret = -1;
|
|
}
|
|
probe_cache__delete(cache);
|
|
return ret;
|
|
}
|
|
#else
|
|
#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)
|
|
#endif
|
|
|
|
static char *build_id_cache__find_debug(const char *sbuild_id,
|
|
struct nsinfo *nsi)
|
|
{
|
|
char *realname = NULL;
|
|
char *debugfile;
|
|
struct nscookie nsc;
|
|
size_t len = 0;
|
|
|
|
debugfile = calloc(1, PATH_MAX);
|
|
if (!debugfile)
|
|
goto out;
|
|
|
|
len = __symbol__join_symfs(debugfile, PATH_MAX,
|
|
"/usr/lib/debug/.build-id/");
|
|
snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
|
|
sbuild_id + 2);
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
realname = realpath(debugfile, NULL);
|
|
if (realname && access(realname, R_OK))
|
|
zfree(&realname);
|
|
nsinfo__mountns_exit(&nsc);
|
|
|
|
#ifdef HAVE_DEBUGINFOD_SUPPORT
|
|
if (realname == NULL) {
|
|
debuginfod_client* c = debuginfod_begin();
|
|
if (c != NULL) {
|
|
int fd = debuginfod_find_debuginfo(c,
|
|
(const unsigned char*)sbuild_id, 0,
|
|
&realname);
|
|
if (fd >= 0)
|
|
close(fd); /* retaining reference by realname */
|
|
debuginfod_end(c);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
out:
|
|
free(debugfile);
|
|
return realname;
|
|
}
|
|
|
|
int build_id_cache__add_s(const char *sbuild_id, const char *name,
|
|
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *realname = NULL, *filename = NULL, *dir_name = NULL,
|
|
*linkname = zalloc(size), *tmp;
|
|
char *debugfile = NULL;
|
|
int err = -1;
|
|
|
|
if (!is_kallsyms) {
|
|
if (!is_vdso)
|
|
realname = nsinfo__realpath(name, nsi);
|
|
else
|
|
realname = realpath(name, NULL);
|
|
if (!realname)
|
|
goto out_free;
|
|
}
|
|
|
|
dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms,
|
|
is_vdso);
|
|
if (!dir_name)
|
|
goto out_free;
|
|
|
|
/* Remove old style build-id cache */
|
|
if (is_regular_file(dir_name))
|
|
if (unlink(dir_name))
|
|
goto out_free;
|
|
|
|
if (mkdir_p(dir_name, 0755))
|
|
goto out_free;
|
|
|
|
/* Save the allocated buildid dirname */
|
|
if (asprintf(&filename, "%s/%s", dir_name,
|
|
build_id_cache__basename(is_kallsyms, is_vdso,
|
|
false)) < 0) {
|
|
filename = NULL;
|
|
goto out_free;
|
|
}
|
|
|
|
if (access(filename, F_OK)) {
|
|
if (is_kallsyms) {
|
|
if (copyfile("/proc/kallsyms", filename))
|
|
goto out_free;
|
|
} else if (nsi && nsi->need_setns) {
|
|
if (copyfile_ns(name, filename, nsi))
|
|
goto out_free;
|
|
} else if (link(realname, filename) && errno != EEXIST &&
|
|
copyfile(name, filename))
|
|
goto out_free;
|
|
}
|
|
|
|
/* Some binaries are stripped, but have .debug files with their symbol
|
|
* table. Check to see if we can locate one of those, since the elf
|
|
* file itself may not be very useful to users of our tools without a
|
|
* symtab.
|
|
*/
|
|
if (!is_kallsyms && !is_vdso &&
|
|
strncmp(".ko", name + strlen(name) - 3, 3)) {
|
|
debugfile = build_id_cache__find_debug(sbuild_id, nsi);
|
|
if (debugfile) {
|
|
zfree(&filename);
|
|
if (asprintf(&filename, "%s/%s", dir_name,
|
|
build_id_cache__basename(false, false, true)) < 0) {
|
|
filename = NULL;
|
|
goto out_free;
|
|
}
|
|
if (access(filename, F_OK)) {
|
|
if (nsi && nsi->need_setns) {
|
|
if (copyfile_ns(debugfile, filename,
|
|
nsi))
|
|
goto out_free;
|
|
} else if (link(debugfile, filename) &&
|
|
errno != EEXIST &&
|
|
copyfile(debugfile, filename))
|
|
goto out_free;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size))
|
|
goto out_free;
|
|
tmp = strrchr(linkname, '/');
|
|
*tmp = '\0';
|
|
|
|
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
|
|
goto out_free;
|
|
|
|
*tmp = '/';
|
|
tmp = dir_name + strlen(buildid_dir) - 5;
|
|
memcpy(tmp, "../..", 5);
|
|
|
|
if (symlink(tmp, linkname) == 0)
|
|
err = 0;
|
|
|
|
/* Update SDT cache : error is just warned */
|
|
if (realname &&
|
|
build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)
|
|
pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
|
|
|
|
out_free:
|
|
if (!is_kallsyms)
|
|
free(realname);
|
|
free(filename);
|
|
free(debugfile);
|
|
free(dir_name);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
static int build_id_cache__add_b(const struct build_id *bid,
|
|
const char *name, struct nsinfo *nsi,
|
|
bool is_kallsyms, bool is_vdso)
|
|
{
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
build_id__sprintf(bid, sbuild_id);
|
|
|
|
return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
|
|
is_vdso);
|
|
}
|
|
|
|
bool build_id_cache__cached(const char *sbuild_id)
|
|
{
|
|
bool ret = false;
|
|
char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
|
|
if (filename && !access(filename, F_OK))
|
|
ret = true;
|
|
free(filename);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int build_id_cache__remove_s(const char *sbuild_id)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *filename = zalloc(size),
|
|
*linkname = zalloc(size), *tmp;
|
|
int err = -1;
|
|
|
|
if (filename == NULL || linkname == NULL)
|
|
goto out_free;
|
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size))
|
|
goto out_free;
|
|
|
|
if (access(linkname, F_OK))
|
|
goto out_free;
|
|
|
|
if (readlink(linkname, filename, size - 1) < 0)
|
|
goto out_free;
|
|
|
|
if (unlink(linkname))
|
|
goto out_free;
|
|
|
|
/*
|
|
* Since the link is relative, we must make it absolute:
|
|
*/
|
|
tmp = strrchr(linkname, '/') + 1;
|
|
snprintf(tmp, size - (tmp - linkname), "%s", filename);
|
|
|
|
if (rm_rf(linkname))
|
|
goto out_free;
|
|
|
|
err = 0;
|
|
out_free:
|
|
free(filename);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
static int dso__cache_build_id(struct dso *dso, struct machine *machine)
|
|
{
|
|
bool is_kallsyms = dso__is_kallsyms(dso);
|
|
bool is_vdso = dso__is_vdso(dso);
|
|
const char *name = dso->long_name;
|
|
|
|
if (dso__is_kcore(dso)) {
|
|
is_kallsyms = true;
|
|
name = machine->mmap_name;
|
|
}
|
|
return build_id_cache__add_b(&dso->bid, name, dso->nsinfo,
|
|
is_kallsyms, is_vdso);
|
|
}
|
|
|
|
static int __dsos__cache_build_ids(struct list_head *head,
|
|
struct machine *machine)
|
|
{
|
|
struct dso *pos;
|
|
int err = 0;
|
|
|
|
dsos__for_each_with_build_id(pos, head)
|
|
if (dso__cache_build_id(pos, machine))
|
|
err = -1;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int machine__cache_build_ids(struct machine *machine)
|
|
{
|
|
return __dsos__cache_build_ids(&machine->dsos.head, machine);
|
|
}
|
|
|
|
int perf_session__cache_build_ids(struct perf_session *session)
|
|
{
|
|
struct rb_node *nd;
|
|
int ret;
|
|
|
|
if (no_buildid_cache)
|
|
return 0;
|
|
|
|
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
|
|
return -1;
|
|
|
|
ret = machine__cache_build_ids(&session->machines.host);
|
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
ret |= machine__cache_build_ids(pos);
|
|
}
|
|
return ret ? -1 : 0;
|
|
}
|
|
|
|
static bool machine__read_build_ids(struct machine *machine, bool with_hits)
|
|
{
|
|
return __dsos__read_build_ids(&machine->dsos.head, with_hits);
|
|
}
|
|
|
|
bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
|
|
{
|
|
struct rb_node *nd;
|
|
bool ret = machine__read_build_ids(&session->machines.host, with_hits);
|
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
ret |= machine__read_build_ids(pos, with_hits);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void build_id__init(struct build_id *bid, const u8 *data, size_t size)
|
|
{
|
|
WARN_ON(size > BUILD_ID_SIZE);
|
|
memcpy(bid->data, data, size);
|
|
bid->size = size;
|
|
}
|