perf symbols: Allow forcing reading of non-root owned files by root

When the root user tries to read a file owned by some other user we get:

  # ls -la perf.data
  -rw-------. 1 acme acme 20032 Nov 12 15:50 perf.data
  # perf report
  File perf.data not owned by current user or root (use -f to override)
  # perf report -f | grep -v ^# | head -2
    30.96%  ls       [kernel.vmlinux]  [k] do_set_pte
    28.24%  ls       libc-2.20.so      [.] intel_check_word
  #

That wasn't happening when the symbol code tried to read a JIT map,
where the same check was done but no forcing was possible, fix it.

Reported-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Tested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://permalink.gmane.org/gmane.linux.kernel.perf.user/2380
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 2853ad2..f256fac 100644 (file)
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -44,7 +44,7 @@
 struct report {
        struct perf_tool        tool;
        struct perf_session     *session;
-       bool                    force, use_tui, use_gtk, use_stdio;
+       bool                    use_tui, use_gtk, use_stdio;
        bool                    hide_unresolved;
        bool                    dont_use_callchains;
        bool                    show_full_info;
@@ -678,7 +678,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
                   "file", "vmlinux pathname"),
        OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
                   "file", "kallsyms pathname"),
-       OPT_BOOLEAN('f', "force", &report.force, "don't complain, do it"),
+       OPT_BOOLEAN('f', "force", &symbol_conf.force, "don't complain, do it"),
        OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
                    "load module symbols - WARNING: use only with -k and LIVE kernel"),
        OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
@@ -832,7 +832,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
        }
 
        file.path  = input_name;
-       file.force = report.force;
+       file.force = symbol_conf.force;
 
 repeat:
        session = perf_session__new(&file, false, &report.tool);

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 09343a8..cd08027 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1436,9 +1436,9 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
                if (lstat(dso->name, &st) < 0)
                        goto out;
 
-               if (st.st_uid && (st.st_uid != geteuid())) {
+               if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
                        pr_warning("File %s not owned by current user or root, "
-                               "ignoring it.\n", dso->name);
+                                  "ignoring it (use -f to override).\n", dso->name);
                        goto out;
                }
 

diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 40073c6..dcd786e 100644 (file)
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -84,6 +84,7 @@ struct symbol_conf {
        unsigned short  priv_size;
        unsigned short  nr_events;
        bool            try_vmlinux_path,
+                       force,
                        ignore_vmlinux,
                        ignore_vmlinux_buildid,
                        show_kernel_path,