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Subject[tip:perf/urgent] perf script: Add array bound checking to list_scripts
Commit-ID:  905e4aff31382c3f9b2014d1361f4a1be4479ba2
Gitweb: https://git.kernel.org/tip/905e4aff31382c3f9b2014d1361f4a1be4479ba2
Author: Andi Kleen <ak@linux.intel.com>
AuthorDate: Mon, 11 Mar 2019 07:45:01 -0700
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 11 Mar 2019 16:33:19 -0300

perf script: Add array bound checking to list_scripts

Don't overflow array when the scripts directory is too large, or the
script file name is too long.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190311144502.15423-11-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-script.c | 8 ++++++--
tools/perf/builtin.h | 3 ++-
tools/perf/ui/browsers/scripts.c | 3 ++-
3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index b695b20ffc8a..2f93d60c5a17 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -2982,7 +2982,8 @@ static int check_ev_match(char *dir_name, char *scriptname,
* will list all statically runnable scripts, select one, execute it and
* show the output in a perf browser.
*/
-int find_scripts(char **scripts_array, char **scripts_path_array)
+int find_scripts(char **scripts_array, char **scripts_path_array, int num,
+ int pathlen)
{
struct dirent *script_dirent, *lang_dirent;
char scripts_path[MAXPATHLEN], lang_path[MAXPATHLEN];
@@ -3027,7 +3028,10 @@ int find_scripts(char **scripts_array, char **scripts_path_array)
/* Skip those real time scripts: xxxtop.p[yl] */
if (strstr(script_dirent->d_name, "top."))
continue;
- sprintf(scripts_path_array[i], "%s/%s", lang_path,
+ if (i >= num)
+ break;
+ snprintf(scripts_path_array[i], pathlen, "%s/%s",
+ lang_path,
script_dirent->d_name);
temp = strchr(script_dirent->d_name, '.');
snprintf(scripts_array[i],
diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
index 05745f3ce912..999fe9170122 100644
--- a/tools/perf/builtin.h
+++ b/tools/perf/builtin.h
@@ -40,5 +40,6 @@ int cmd_mem(int argc, const char **argv);
int cmd_data(int argc, const char **argv);
int cmd_ftrace(int argc, const char **argv);

-int find_scripts(char **scripts_array, char **scripts_path_array);
+int find_scripts(char **scripts_array, char **scripts_path_array, int num,
+ int pathlen);
#endif
diff --git a/tools/perf/ui/browsers/scripts.c b/tools/perf/ui/browsers/scripts.c
index cdba58447b85..96e5cd3b0eee 100644
--- a/tools/perf/ui/browsers/scripts.c
+++ b/tools/perf/ui/browsers/scripts.c
@@ -97,7 +97,8 @@ static int list_scripts(char *script_name, bool *custom,
paths[i] = names[i] + SCRIPT_NAMELEN;
}

- num = find_scripts(names + max_std, paths + max_std);
+ num = find_scripts(names + max_std, paths + max_std, SCRIPT_MAX_NO - max_std,
+ SCRIPT_FULLPATH_LEN);
if (num < 0)
num = 0;
choice = ui__popup_menu(num + max_std, (char * const *)names);
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