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Merge remote-tracking branch 'tor-github/pr/1661/head' into maint-0.3.5

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This commit is contained in:
Nick Mathewson 2020-10-07 08:14:46 -04:00
commit 98e14720b5
2 changed files with 54 additions and 4 deletions
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4
changes/log_32868 Normal file
View File

@ -0,0 +1,4 @@
o Minor features (debugging, directory system):
- Don't crash when we find a non-guard with a guard-fraction value set.
Instead, log a bug warning, in an attempt to figure out how this
happened. Diagnostic for ticket 32868.

54
src/feature/nodelist/node_select.c
View File

@ -540,6 +540,51 @@ bridge_get_advertised_bandwidth_bounded(routerinfo_t *router)
return result;
}
/**
* We have found an instance of bug 32868: log our best guess about where the
* routerstatus was found.
**/
static void
log_buggy_rs_source(const routerstatus_t *rs)
{
static ratelim_t buggy_rs_ratelim = RATELIM_INIT(1200);
char *m;
if ((m = rate_limit_log(&buggy_rs_ratelim, approx_time()))) {
log_warn(LD_BUG,
"Found a routerstatus %p with has_guardfraction=%u "
" and guardfraction_percentage=%u, but is_possible_guard=%u.%s",
rs,
rs->has_guardfraction,
rs->guardfraction_percentage,
rs->is_possible_guard,
m);
tor_free(m);
networkstatus_t *ns;
int in_ns_count = 0;
if ((ns = networkstatus_get_latest_consensus_by_flavor(FLAV_NS))) {
int pos = smartlist_pos(ns->routerstatus_list, rs);
if (pos >= 0) {
++in_ns_count;
log_warn(LD_BUG, "Found the routerstatus at position %d of the "
"NS consensus.", pos);
}
}
if ((ns = networkstatus_get_latest_consensus_by_flavor(FLAV_MICRODESC))) {
int pos = smartlist_pos(ns->routerstatus_list, rs);
if (pos >= 0) {
++in_ns_count;
log_warn(LD_BUG, "Found the routerstatus at position %d of the "
"MD consensus.", pos);
}
}
if (in_ns_count == 0) {
log_warn(LD_BUG, "Could not find the routerstatus in any "
"latest consensus.");
}
tor_assert_nonfatal_unreached();
}
}
/** Given a list of routers and a weighting rule as in
* smartlist_choose_node_by_bandwidth_weights, compute weighted bandwidth
* values for each node and store them in a freshly allocated
@ -715,10 +760,11 @@ compute_weighted_bandwidths(const smartlist_t *sl,
* choose N proportionally to F*Wpf*B + (1-F)*Wpn*B.
*/
if (node->rs && node->rs->has_guardfraction && rule != WEIGHT_FOR_GUARD) {
/* XXX The assert should actually check for is_guard. However,
* that crashes dirauths because of #13297. This should be
* equivalent: */
tor_assert(node->rs->is_possible_guard);
/* We should only have guardfraction set if the node has the Guard
flag. */
if (! node->rs->is_possible_guard) {
log_buggy_rs_source(node->rs);
}
guard_get_guardfraction_bandwidth(&guardfraction_bw,
this_bw,