Messages in this thread | | | Date | Mon, 27 Mar 2017 15:01:40 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v3 1/3] perf annotate: Fix a bug reading link name from a build-id file |
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Em Mon, Mar 27, 2017 at 04:10:36PM +0900, Taeung Song escreveu: > It is wrong way to read link name from a build-id file. > Because a build-id file is not symbolic link > but build-id directory of it is symbolic link, so fix it.
Ok, applied, in the past it was always a symlink, but the following cset changed that, so I added:
Fixes: 01412261d994 ("perf buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid")
Thanks,
- Arnaldo
> For example, if build-id file name gotten from > dso__build_id_filename() is as below, > > /root/.debug/.build-id/4f/75c7d197c951659d1c1b8b5fd49bcdf8f3f8b1/elf > > To correctly read link name of build-id, > use the build-id dir path that is a symbolic link, > instead of the above build-id file name like below. > > /root/.debug/.build-id/4f/75c7d197c951659d1c1b8b5fd49bcdf8f3f8b1 > > Cc: Namhyung Kim <namhyung@kernel.org> > Cc: Jiri Olsa <jolsa@redhat.com> > Signed-off-by: Taeung Song <treeze.taeung@gmail.com> > --- > tools/perf/util/annotate.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > > diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c > index 3d0263e..6dc9148 100644 > --- a/tools/perf/util/annotate.c > +++ b/tools/perf/util/annotate.c > @@ -1307,6 +1307,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil > { > char linkname[PATH_MAX]; > char *build_id_filename; > + char *build_id_path = NULL; > > if (dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS && > !dso__is_kcore(dso)) > @@ -1322,8 +1323,14 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil > goto fallback; > } > > + build_id_path = strdup(filename); > + if (!build_id_path) > + return -1; > + > + dirname(build_id_path); > + > if (dso__is_kcore(dso) || > - readlink(filename, linkname, sizeof(linkname)) < 0 || > + readlink(build_id_path, linkname, sizeof(linkname)) < 0 || > strstr(linkname, DSO__NAME_KALLSYMS) || > access(filename, R_OK)) { > fallback: > @@ -1335,6 +1342,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil > __symbol__join_symfs(filename, filename_size, dso->long_name); > } > > + free(build_id_path); > return 0; > } > > -- > 2.7.4
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