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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/perf/util/build-id.c
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@@ -7,14 +7,18 @@
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  * Copyright (C) 2009, 2010 Red Hat Inc.
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  * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
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  */
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-#include "util.h"
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+#include "util.h" // lsdir(), mkdir_p(), rm_rf()
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 #include <dirent.h>
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 #include <errno.h>
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 #include <stdio.h>
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 #include <sys/stat.h>
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 #include <sys/types.h>
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+#include "util/copyfile.h"
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+#include "dso.h"
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 #include "build-id.h"
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 #include "event.h"
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+#include "namespaces.h"
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+#include "map.h"
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 #include "symbol.h"
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 #include "thread.h"
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 #include <linux/kernel.h>
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@@ -27,14 +31,20 @@
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 #include "probe-file.h"
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 #include "strlist.h"
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-#include "sane_ctype.h"
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+#ifdef HAVE_DEBUGINFOD_SUPPORT
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+#include <elfutils/debuginfod.h>
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+#endif
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+
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+#include <linux/ctype.h>
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+#include <linux/zalloc.h>
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+#include <asm/bug.h>
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41
 
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 static bool no_buildid_cache;
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43
 
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 int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
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 			   union perf_event *event,
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 			   struct perf_sample *sample,
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-			   struct perf_evsel *evsel __maybe_unused,
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+			   struct evsel *evsel __maybe_unused,
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 			   struct machine *machine)
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 {
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 	struct addr_location al;
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@@ -86,13 +96,15 @@
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 	.ordered_events	 = true,
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 };
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-int build_id__sprintf(const u8 *build_id, int len, char *bf)
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+int build_id__sprintf(const struct build_id *build_id, char *bf)
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 {
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 	char *bid = bf;
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-	const u8 *raw = build_id;
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-	int i;
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+	const u8 *raw = build_id->data;
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+	size_t i;
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-	for (i = 0; i < len; ++i) {
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+	bf[0] = 0x0;
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+
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+	for (i = 0; i < build_id->size; ++i) {
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 		sprintf(bid, "%02x", *raw);
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 		++raw;
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 		bid += 2;
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@@ -104,7 +116,7 @@
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 int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
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 {
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 	char notes[PATH_MAX];
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-	u8 build_id[BUILD_ID_SIZE];
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+	struct build_id bid;
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 	int ret;
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 	if (!root_dir)
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@@ -112,25 +124,23 @@
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 	scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
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-	ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
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+	ret = sysfs__read_build_id(notes, &bid);
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 	if (ret < 0)
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 		return ret;
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-	return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
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+	return build_id__sprintf(&bid, sbuild_id);
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 }
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 int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
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 {
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-	u8 build_id[BUILD_ID_SIZE];
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+	struct build_id bid;
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 	int ret;
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-	ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
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+	ret = filename__read_build_id(pathname, &bid);
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 	if (ret < 0)
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 		return ret;
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-	else if (ret != sizeof(build_id))
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-		return -EINVAL;
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-	return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
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+	return build_id__sprintf(&bid, sbuild_id);
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 }
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 /* asnprintf consolidates asprintf and snprintf */
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@@ -263,7 +273,7 @@
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 	if (!dso->has_build_id)
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 		return NULL;
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-	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
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+	build_id__sprintf(&dso->bid, sbuild_id);
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 	linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
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 	if (!linkname)
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 		return NULL;
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@@ -288,18 +298,20 @@
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 			continue;		\
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 		else
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-static int write_buildid(const char *name, size_t name_len, u8 *build_id,
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+static int write_buildid(const char *name, size_t name_len, struct build_id *bid,
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 			 pid_t pid, u16 misc, struct feat_fd *fd)
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 {
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 	int err;
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-	struct build_id_event b;
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+	struct perf_record_header_build_id b;
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 	size_t len;
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 	len = name_len + 1;
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 	len = PERF_ALIGN(len, NAME_ALIGN);
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 	memset(&b, 0, sizeof(b));
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-	memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
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+	memcpy(&b.data, bid->data, bid->size);
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+	b.size = (u8) bid->size;
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+	misc |= PERF_RECORD_MISC_BUILD_ID_SIZE;
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 	b.pid = pid;
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 	b.header.misc = misc;
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 	b.header.size = sizeof(b) + len;
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@@ -346,7 +358,7 @@
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 		in_kernel = pos->kernel ||
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 				is_kernel_module(name,
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 					PERF_RECORD_MISC_CPUMODE_UNKNOWN);
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-		err = write_buildid(name, name_len, pos->build_id, machine->pid,
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+		err = write_buildid(name, name_len, &pos->bid, machine->pid,
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 				    in_kernel ? kmisc : umisc, fd);
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 		if (err)
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 			break;
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@@ -364,7 +376,8 @@
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 	if (err)
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 		return err;
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-	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
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+	for (nd = rb_first_cached(&session->machines.guests); nd;
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+	     nd = rb_next(nd)) {
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 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
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 		err = machine__write_buildid_table(pos, fd);
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 		if (err)
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@@ -397,7 +410,8 @@
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 	if (err)
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 		return err;
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-	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
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+	for (nd = rb_first_cached(&session->machines.guests); nd;
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+	     nd = rb_next(nd)) {
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 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
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 		err = machine__hit_all_dsos(pos);
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@@ -629,6 +643,21 @@
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 	if (realname && access(realname, R_OK))
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 		zfree(&realname);
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 	nsinfo__mountns_exit(&nsc);
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+
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+#ifdef HAVE_DEBUGINFOD_SUPPORT
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+        if (realname == NULL) {
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+                debuginfod_client* c = debuginfod_begin();
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+                if (c != NULL) {
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+                        int fd = debuginfod_find_debuginfo(c,
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+                                                           (const unsigned char*)sbuild_id, 0,
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+                                                           &realname);
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+                        if (fd >= 0)
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+                                close(fd); /* retaining reference by realname */
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+                        debuginfod_end(c);
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+                }
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+        }
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+#endif
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+
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 out:
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 	free(debugfile);
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 	return realname;
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@@ -743,13 +772,13 @@
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 	return err;
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 }
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-static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
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+static int build_id_cache__add_b(const struct build_id *bid,
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 				 const char *name, struct nsinfo *nsi,
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 				 bool is_kallsyms, bool is_vdso)
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 {
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 	char sbuild_id[SBUILD_ID_SIZE];
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752
-	build_id__sprintf(build_id, build_id_size, sbuild_id);
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+	build_id__sprintf(bid, sbuild_id);
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 	return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
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 				     is_vdso);
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@@ -815,8 +844,8 @@
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 		is_kallsyms = true;
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 		name = machine->mmap_name;
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 	}
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-	return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
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-				     dso->nsinfo, is_kallsyms, is_vdso);
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+	return build_id_cache__add_b(&dso->bid, name, dso->nsinfo,
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+				     is_kallsyms, is_vdso);
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 }
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850
 
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 static int __dsos__cache_build_ids(struct list_head *head,
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@@ -850,7 +879,8 @@
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 	ret = machine__cache_build_ids(&session->machines.host);
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881
 
853
-	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
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+	for (nd = rb_first_cached(&session->machines.guests); nd;
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+	     nd = rb_next(nd)) {
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 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
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 		ret |= machine__cache_build_ids(pos);
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 	}
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@@ -867,10 +897,18 @@
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 	struct rb_node *nd;
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 	bool ret = machine__read_build_ids(&session->machines.host, with_hits);
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870
-	for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
900
+	for (nd = rb_first_cached(&session->machines.guests); nd;
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+	     nd = rb_next(nd)) {
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 		struct machine *pos = rb_entry(nd, struct machine, rb_node);
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 		ret |= machine__read_build_ids(pos, with_hits);
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 	}
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875
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 	return ret;
876
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 }
908
+
909
+void build_id__init(struct build_id *bid, const u8 *data, size_t size)
910
+{
911
+	WARN_ON(size > BUILD_ID_SIZE);
912
+	memcpy(bid->data, data, size);
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+	bid->size = size;
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+}