sandbox: Permit access to stats/dirreq-stats

This prevents a crash when rotating logs with dirreq-stats enabled

fixes 12035; bugfix on 0.2.5.1-alpha.

changes/12032

@@ -0,0 +1,4 @@
+  o Minor bugfixes (linux syscall sandbox):
+    - Avoid crash when running with sandboxing enabled and
+      DirReqStatistics not disabled. Fixes bug 12035; bugfix on
+      0.2.5.1-alpha.

src/or/main.c

@@ -2836,6 +2836,8 @@ sandbox_init_filter(void)
         get_datadir_fname2("keys", "secret_id_key.tmp"),
         get_datadir_fname2("stats", "bridge-stats"),
         get_datadir_fname2("stats", "bridge-stats.tmp"),
+        get_datadir_fname2("stats", "dirreq-stats"),
+        get_datadir_fname2("stats", "dirreq-stats.tmp"),
         get_datadir_fname("fingerprint"),
         get_datadir_fname("fingerprint.tmp"),
         get_datadir_fname("hashed-fingerprint"),
@@ -2853,6 +2855,7 @@ sandbox_init_filter(void)
     RENAME_SUFFIX2("keys", "secret_onion_key", ".tmp");
     RENAME_SUFFIX2("keys", "secret_onion_key.old", ".tmp");
     RENAME_SUFFIX2("stats", "bridge-stats", ".tmp");
+    RENAME_SUFFIX2("stats", "dirreq-stats", ".tmp");
     RENAME_SUFFIX("hashed-fingerprint", ".tmp");
     RENAME_SUFFIX("router-stability", ".tmp");