FAILED: patch "[PATCH] perf build-id: Fix caching files with a wrong build ID" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ab66fdace8581ef3b4e7cf5381a168ed4058d779 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <[email protected]>
Date: Tue, 21 Jun 2022 15:51:44 +0300
Subject: [PATCH] perf build-id: Fix caching files with a wrong build ID

Build ID events associate a file name with a build ID. However, when using perf inject, there is no guarantee that the file on the current machine at the current time has that build ID. Fix by comparing the build IDs and skip adding to the cache if they are different.

Example:

  $ echo "int main() {return 0;}" > prog.c
  $ gcc -o prog prog.c
  $ perf record --buildid-all ./prog
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.019 MB perf.data ]
  $ file-buildid() { file $1 | awk -F= '{print $2}' | awk -F, '{print $1}' ; }
  $ file-buildid prog
  444ad9be165d8058a48ce2ffb4e9f55854a3293e
  $ file-buildid ~/.debug/$(pwd)/prog/444ad9be165d8058a48ce2ffb4e9f55854a3293e/elf
  444ad9be165d8058a48ce2ffb4e9f55854a3293e
  $ echo "int main() {return 1;}" > prog.c
  $ gcc -o prog prog.c
  $ file-buildid prog
  885524d5aaa24008a3e2b06caa3ea95d013c0fc5

Before:

  $ perf buildid-cache --purge $(pwd)/prog
  $ perf inject -i perf.data -o junk
  $ file-buildid ~/.debug/$(pwd)/prog/444ad9be165d8058a48ce2ffb4e9f55854a3293e/elf
  885524d5aaa24008a3e2b06caa3ea95d013c0fc5
  $

After:

  $ perf buildid-cache --purge $(pwd)/prog
  $ perf inject -i perf.data -o junk
  $ file-buildid ~/.debug/$(pwd)/prog/444ad9be165d8058a48ce2ffb4e9f55854a3293e/elf

$

index 82f3d46bea70..328668f38c69 100644
@@ -872,6 +872,30 @@ int build_id_cache__remove_s(const char *sbuild_id)
 	return err;
 }
 
+static int filename__read_build_id_ns(const char *filename,
+				      struct build_id *bid,
+				      struct nsinfo *nsi)
+{
+	struct nscookie nsc;
+	int ret;
+
+	nsinfo__mountns_enter(nsi, &nsc);
+	ret = filename__read_build_id(filename, bid);
+	nsinfo__mountns_exit(&nsc);
+
+	return ret;
+}
+
+static bool dso__build_id_mismatch(struct dso *dso, const char *name)
+{
+	struct build_id bid;
+
+	if (filename__read_build_id_ns(name, &bid, dso->nsinfo) < 0)
+		return false;
+
+	return !dso__build_id_equal(dso, &bid);
+}
+
 static int dso__cache_build_id(struct dso *dso, struct machine *machine,
 			       void *priv __maybe_unused)
 {

@@ -886,6 +910,10 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine,
 		is_kallsyms = true;
 		name = machine->mmap_name;
 	}
+
+	if (!is_kallsyms && dso__build_id_mismatch(dso, name))
+		return 0;
+
 	return build_id_cache__add_b(&dso->bid, name, dso->nsinfo,
 				     is_kallsyms, is_vdso);
 }