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ircd:Ⓜ️:vm::eval: Add coarse limit to options for array evals.

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This commit is contained in:
Jason Volk 2020-09-07 16:55:47 -07:00
parent 023e1341a1
commit 5c7007ebef
2 changed files with 8 additions and 2 deletions
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4
include/ircd/m/vm.h
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@ -328,6 +328,10 @@ struct ircd::m::vm::opts
/// reason to ever adjust this.
size_t reserve_index {1024};
/// Coarse limit for array evals. The counter is incremented for every
/// event; both accepted and faulted.
size_t limit = -1;
/// Mask of faults that are not thrown as exceptions out of eval(). If
/// masked, the fault is returned from eval(). By default, the EXISTS
/// fault is masked which means existing events won't kill eval loops.

6
matrix/vm_eval.cc
View file

@ -370,6 +370,8 @@ ircd::m::vm::eval::eval(const json::array &pdus,
:eval{opts}
{
std::vector<m::event> events(begin(pdus), end(pdus));
if(events.size() > opts.limit)
events.resize(opts.limit);
// Sort the events first to avoid complicating the evals; the events might
// be from different rooms but it doesn't matter.
@ -411,8 +413,8 @@ ircd::m::vm::eval::operator()(const vector_view<m::event> &events)
// Conduct each eval without letting any one exception ruin things for the
// others, including an interrupt. The only exception is a termination.
size_t ret(0);
for(auto it(begin(events)); it != end(events); ++it) try
size_t ret(0), i(0);
for(auto it(begin(events)); it != end(events) && i < opts->limit; ++it, ++i) try
{
const m::event &event
{