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Fix unaligned reads

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This commit is contained in:
Nicolas Werner 2021-02-25 15:15:59 +01:00
parent c62f328590
commit 1f373479b8
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GPG key ID: 13675F31AD04A41C
1 changed files with 30 additions and 16 deletions
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46
src/Cache.cpp
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@ -102,6 +102,20 @@ namespace {
std::unique_ptr<Cache> instance_ = nullptr; std::unique_ptr<Cache> instance_ = nullptr;
} }
template<class T>
static T
to(lmdb::val &value)
{
static_assert(std::is_trivial_v<T>, "Can only convert to trivial types!");
T temp;
if (value.size() < sizeof(T))
throw lmdb::runtime_error(__func__, MDB_BAD_VALSIZE);
std::memcpy(&temp, value.data(), sizeof(T));
return temp;
}
bool bool
Cache::isHiddenEvent(lmdb::txn &txn, Cache::isHiddenEvent(lmdb::txn &txn,
mtx::events::collections::TimelineEvents e, mtx::events::collections::TimelineEvents e,
@ -1667,14 +1681,14 @@ Cache::getTimelineMessages(lmdb::txn &txn, const std::string &room_id, uint64_t
auto cursor = lmdb::cursor::open(txn, orderDb); auto cursor = lmdb::cursor::open(txn, orderDb);
if (index == std::numeric_limits<uint64_t>::max()) { if (index == std::numeric_limits<uint64_t>::max()) {
if (cursor.get(indexVal, event_id, forward ? MDB_FIRST : MDB_LAST)) { if (cursor.get(indexVal, event_id, forward ? MDB_FIRST : MDB_LAST)) {
index = *indexVal.data<uint64_t>(); index = to<uint64_t>(indexVal);
} else { } else {
messages.end_of_cache = true; messages.end_of_cache = true;
return messages; return messages;
} }
} else { } else {
if (cursor.get(indexVal, event_id, MDB_SET)) { if (cursor.get(indexVal, event_id, MDB_SET)) {
index = *indexVal.data<uint64_t>(); index = to<uint64_t>(indexVal);
} else { } else {
messages.end_of_cache = true; messages.end_of_cache = true;
return messages; return messages;
@ -1708,7 +1722,7 @@ Cache::getTimelineMessages(lmdb::txn &txn, const std::string &room_id, uint64_t
cursor.close(); cursor.close();
// std::reverse(timeline.events.begin(), timeline.events.end()); // std::reverse(timeline.events.begin(), timeline.events.end());
messages.next_index = *indexVal.data<uint64_t>(); messages.next_index = to<uint64_t>(indexVal);
messages.end_of_cache = !ret; messages.end_of_cache = !ret;
return messages; return messages;
@ -1861,12 +1875,12 @@ Cache::getTimelineRange(const std::string &room_id)
} }
TimelineRange range{}; TimelineRange range{};
range.last = *indexVal.data<uint64_t>(); range.last = to<uint64_t>(indexVal);
if (!cursor.get(indexVal, val, MDB_FIRST)) { if (!cursor.get(indexVal, val, MDB_FIRST)) {
return {}; return {};
} }
range.first = *indexVal.data<uint64_t>(); range.first = to<uint64_t>(indexVal);
return range; return range;
} }
@ -1892,7 +1906,7 @@ Cache::getTimelineIndex(const std::string &room_id, std::string_view event_id)
return {}; return {};
} }
return *val.data<uint64_t>(); return to<uint64_t>(val);
} }
std::optional<uint64_t> std::optional<uint64_t>
@ -1920,7 +1934,7 @@ Cache::getEventIndex(const std::string &room_id, std::string_view event_id)
return {}; return {};
} }
return *val.data<uint64_t>(); return to<uint64_t>(val);
} }
std::optional<std::pair<uint64_t, std::string>> std::optional<std::pair<uint64_t, std::string>>
@ -1951,7 +1965,7 @@ Cache::lastInvisibleEventAfter(const std::string &room_id, std::string_view even
if (!success) { if (!success) {
return {}; return {};
} }
uint64_t prevIdx = *indexVal.data<uint64_t>(); uint64_t prevIdx = to<uint64_t>(indexVal);
std::string prevId{eventIdVal.data(), eventIdVal.size()}; std::string prevId{eventIdVal.data(), eventIdVal.size()};
auto cursor = lmdb::cursor::open(txn, eventOrderDb); auto cursor = lmdb::cursor::open(txn, eventOrderDb);
@ -1964,7 +1978,7 @@ Cache::lastInvisibleEventAfter(const std::string &room_id, std::string_view even
if (lmdb::dbi_get(txn, timelineDb, lmdb::val(evId.data(), evId.size()), temp)) { if (lmdb::dbi_get(txn, timelineDb, lmdb::val(evId.data(), evId.size()), temp)) {
return std::pair{prevIdx, std::string(prevId)}; return std::pair{prevIdx, std::string(prevId)};
} else { } else {
prevIdx = *indexVal.data<uint64_t>(); prevIdx = to<uint64_t>(indexVal);
prevId = std::move(evId); prevId = std::move(evId);
} }
} }
@ -1994,7 +2008,7 @@ Cache::getArrivalIndex(const std::string &room_id, std::string_view event_id)
return {}; return {};
} }
return *val.data<uint64_t>(); return to<uint64_t>(val);
} }
std::optional<std::string> std::optional<std::string>
@ -2775,13 +2789,13 @@ Cache::saveTimelineMessages(lmdb::txn &txn,
uint64_t index = std::numeric_limits<uint64_t>::max() / 2; uint64_t index = std::numeric_limits<uint64_t>::max() / 2;
auto cursor = lmdb::cursor::open(txn, orderDb); auto cursor = lmdb::cursor::open(txn, orderDb);
if (cursor.get(indexVal, val, MDB_LAST)) { if (cursor.get(indexVal, val, MDB_LAST)) {
index = *indexVal.data<int64_t>(); index = to<uint64_t>(indexVal);
} }
uint64_t msgIndex = std::numeric_limits<uint64_t>::max() / 2; uint64_t msgIndex = std::numeric_limits<uint64_t>::max() / 2;
auto msgCursor = lmdb::cursor::open(txn, order2msgDb); auto msgCursor = lmdb::cursor::open(txn, order2msgDb);
if (msgCursor.get(indexVal, val, MDB_LAST)) { if (msgCursor.get(indexVal, val, MDB_LAST)) {
msgIndex = *indexVal.data<uint64_t>(); msgIndex = to<uint64_t>(indexVal);
} }
bool first = true; bool first = true;
@ -2942,7 +2956,7 @@ Cache::saveOldMessages(const std::string &room_id, const mtx::responses::Message
{ {
auto cursor = lmdb::cursor::open(txn, orderDb); auto cursor = lmdb::cursor::open(txn, orderDb);
if (cursor.get(indexVal, val, MDB_FIRST)) { if (cursor.get(indexVal, val, MDB_FIRST)) {
index = *indexVal.data<uint64_t>(); index = to<uint64_t>(indexVal);
} }
} }
@ -2950,7 +2964,7 @@ Cache::saveOldMessages(const std::string &room_id, const mtx::responses::Message
{ {
auto msgCursor = lmdb::cursor::open(txn, order2msgDb); auto msgCursor = lmdb::cursor::open(txn, order2msgDb);
if (msgCursor.get(indexVal, val, MDB_FIRST)) { if (msgCursor.get(indexVal, val, MDB_FIRST)) {
msgIndex = *indexVal.data<uint64_t>(); msgIndex = to<uint64_t>(indexVal);
} }
} }
@ -3258,12 +3272,12 @@ Cache::deleteOldMessages()
uint64_t first, last; uint64_t first, last;
if (cursor.get(indexVal, val, MDB_LAST)) { if (cursor.get(indexVal, val, MDB_LAST)) {
last = *indexVal.data<uint64_t>(); last = to<uint64_t>(indexVal);
} else { } else {
continue; continue;
} }
if (cursor.get(indexVal, val, MDB_FIRST)) { if (cursor.get(indexVal, val, MDB_FIRST)) {
first = *indexVal.data<uint64_t>(); first = to<uint64_t>(indexVal);
} else { } else {
continue; continue;
} }