tor

commit 83483bd4f6326b519871208b3e5af4ae01f13179
parent 9085508310ab06c2b7ed0650e77dbe86023095f3
Author: Alexander Færøy <ahf@torproject.org>
Date:   Fri, 25 Jun 2021 16:29:53 +0000

Enable deterministic RNG for address set tests.

This patch enables the deterministic RNG for address set tests,
including the tests which uses address set indirectly via the nodelist
API.

This should prevent random test failures in the highly unlikely case of
a false positive which was seen in tor#40419.

See: tpo/core/tor#40419.

Diffstat:
A
changes/ticket40419
 | 
3
+++
M
src/test/test_address_set.c
 | 
13
+++++++++++++

2 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/changes/ticket40419 b/changes/ticket40419
@@ -0,0 +1,3 @@
+  o Minor features (testing):
+    - Enable the deterministic RNG for unit tests that covers the address set
+      bloomfilter-based API's. Fixes bug 40419; bugfix on 0.3.3.2-alpha.
diff --git a/src/test/test_address_set.c b/src/test/test_address_set.c
@@ -17,6 +17,7 @@
 #include "feature/nodelist/routerstatus_st.h"
 
 #include "test/test.h"
+#include "test/rng_test_helpers.h"
 
 static networkstatus_t *dummy_ns = NULL;
 static networkstatus_t *
@@ -62,6 +63,10 @@ test_contains(void *arg)
   tor_addr_parse(&addr_v4, "42.42.42.42");
   uint32_t ipv4h = tor_addr_to_ipv4h(&addr_v4);
 
+  /* Use our deterministic RNG since the address set uses a bloom filter
+   * internally. */
+  testing_enable_deterministic_rng();
+
   /* Make it very big so the chance of failing the contain test will be
    * extremely rare. */
   set = address_set_new(1024);
@@ -89,6 +94,8 @@ test_contains(void *arg)
 
  done:
   address_set_free(set);
+
+  testing_disable_deterministic_rng();
 }
 
 static void
@@ -108,6 +115,10 @@ test_nodelist(void *arg)
   MOCK(dirlist_add_trusted_dir_addresses,
        mock_dirlist_add_trusted_dir_addresses);
 
+  /* Use our deterministic RNG since the address set, used for
+   * nodelist_probably_contains_address() uses a bloom filter internally. */
+  testing_enable_deterministic_rng();
+
   dummy_ns = tor_malloc_zero(sizeof(*dummy_ns));
   dummy_ns->flavor = FLAV_MICRODESC;
   dummy_ns->routerstatus_list = smartlist_new();
@@ -179,6 +190,8 @@ test_nodelist(void *arg)
   UNMOCK(networkstatus_get_latest_consensus_by_flavor);
   UNMOCK(get_estimated_address_per_node);
   UNMOCK(dirlist_add_trusted_dir_addresses);
+
+  testing_disable_deterministic_rng();
 }
 
 /** Test that the no-reentry exit filter works as intended */