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

  $

Fixes: 14e8f213492ac8d3 ("perf: add perf-inject builtin")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Link: https://lore.kernel.org/r/20220621125144.5623-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 82f3d46bea70e677b19641f77c1cdf69957d43ad..328668f38c69dfdea0dcba383726a546acea8eef 100644 (file)
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -872,6 +872,30 @@ out_free:
        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);
 }