perf tools: Fix mode setting in copyfile_mode_ns()

slow_copyfile() opens the file by name, so "write" permissions must not
be removed in copyfile_mode_ns() before calling slow_copyfile().

Example:

 Before:

  $ sudo chmod +r /proc/kcore
  $ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
  $ tools/perf/perf buildid-cache -k /proc/kcore
  Couldn't add /proc/kcore

 After:

  $ sudo chmod +r /proc/kcore
  $ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
  $ tools/perf/perf buildid-cache -v -k /proc/kcore
  kcore added to build-id cache directory /home/ahunter/.debug/[kernel.kcore]/37e340b1b5a7cf4f57ba8de2bc777359588a957f/2019100709562289

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lore.kernel.org/lkml/20191007070221.11158-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/copyfile.c b/tools/perf/util/copyfile.c
index 3fa0db1..47e03de 100644 (file)
--- a/tools/perf/util/copyfile.c
+++ b/tools/perf/util/copyfile.c
@@ -101,14 +101,16 @@ static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
        if (tofd < 0)
                goto out;
 
-       if (fchmod(tofd, mode))
-               goto out_close_to;
-
        if (st.st_size == 0) { /* /proc? do it slowly... */
                err = slow_copyfile(from, tmp, nsi);
+               if (!err && fchmod(tofd, mode))
+                       err = -1;
                goto out_close_to;
        }
 
+       if (fchmod(tofd, mode))
+               goto out_close_to;
+
        nsinfo__mountns_enter(nsi, &nsc);
        fromfd = open(from, O_RDONLY);
        nsinfo__mountns_exit(&nsc);