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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-11-12 16:50:13 -03:00
parent b7f294b58a
commit 2059fc7a5a
3 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
tools/perf/builtin-report.c
View File

@ -44,7 +44,7 @@
struct report { struct report {
struct perf_tool tool; struct perf_tool tool;
struct perf_session *session; struct perf_session *session;
bool force, use_tui, use_gtk, use_stdio; bool use_tui, use_gtk, use_stdio;
bool hide_unresolved; bool hide_unresolved;
bool dont_use_callchains; bool dont_use_callchains;
bool show_full_info; bool show_full_info;
@ -678,7 +678,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
"file", "vmlinux pathname"), "file", "vmlinux pathname"),
OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name, OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
"file", "kallsyms pathname"), "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, OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
"load module symbols - WARNING: use only with -k and LIVE kernel"), "load module symbols - WARNING: use only with -k and LIVE kernel"),
OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples, 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.path = input_name;
file.force = report.force; file.force = symbol_conf.force;
repeat: repeat:
session = perf_session__new(&file, false, &report.tool); session = perf_session__new(&file, false, &report.tool);

4
tools/perf/util/symbol.c
View File

@ -1436,9 +1436,9 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
if (lstat(dso->name, &st) < 0) if (lstat(dso->name, &st) < 0)
goto out; 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, " 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; goto out;
} }

1
tools/perf/util/symbol.h
View File

@ -84,6 +84,7 @@ struct symbol_conf {
unsigned short priv_size; unsigned short priv_size;
unsigned short nr_events; unsigned short nr_events;
bool try_vmlinux_path, bool try_vmlinux_path,
force,
ignore_vmlinux, ignore_vmlinux,
ignore_vmlinux_buildid, ignore_vmlinux_buildid,
show_kernel_path, show_kernel_path,