Commit 2059fc7a authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

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: default avatarBrendan Gregg <brendan.d.gregg@gmail.com>
Tested-by: default avatarBrendan 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent b7f294b5

tools/perf/builtin-report.c

+3 −3
Original line number Diff line number Diff line
@@ -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);

tools/perf/util/symbol.c

+2 −2
Original line number Diff line number Diff line
@@ -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;

		}

tools/perf/util/symbol.h

+1 −0
Original line number Diff line number Diff line
@@ -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,

CRA Git | Maintained and supported by SUSTech CRA and CCSE