andreacavalli/rocksdb
0
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Fix PinSelf() read-after-free in DB::GetMergeOperands() (#9507)

Browse Source 
Summary:
**Context:**
Running the new test `DBMergeOperandTest.MergeOperandReadAfterFreeBug` prior to this fix surfaces the read-after-free bug of PinSef() as below:
```
READ of size 8 at 0x60400002529d thread T0
    https://github.com/facebook/rocksdb/issues/5 0x7f199a in rocksdb::PinnableSlice::PinSelf(rocksdb::Slice const&) include/rocksdb/slice.h:171
    https://github.com/facebook/rocksdb/issues/6 0x7f199a in rocksdb::DBImpl::GetImpl(rocksdb::ReadOptions const&, rocksdb::Slice const&, rocksdb::DBImpl::GetImplOptions&) db/db_impl/db_impl.cc:1919
    https://github.com/facebook/rocksdb/issues/7 0x540d63 in rocksdb::DBImpl::GetMergeOperands(rocksdb::ReadOptions const&, rocksdb::ColumnFamilyHandle*, rocksdb::Slice const&, rocksdb::PinnableSlice*, rocksdb::GetMergeOperandsOptions*, int*) db/db_impl/db_impl.h:203

freed by thread T0 here:
    https://github.com/facebook/rocksdb/issues/3 0x1191399 in rocksdb::cache_entry_roles_detail::RegisteredDeleter<rocksdb::Block, (rocksdb::CacheEntryRole)0>::Delete(rocksdb::Slice const&, void*) cache/cache_entry_roles.h:99
    https://github.com/facebook/rocksdb/issues/4 0x719348 in rocksdb::LRUHandle::Free() cache/lru_cache.h:205
    https://github.com/facebook/rocksdb/issues/5 0x71047f in rocksdb::LRUCacheShard::Release(rocksdb::Cache::Handle*, bool) cache/lru_cache.cc:547
    https://github.com/facebook/rocksdb/issues/6 0xa78f0a in rocksdb::Cleanable::DoCleanup() include/rocksdb/cleanable.h:60
    https://github.com/facebook/rocksdb/issues/7 0xa78f0a in rocksdb::Cleanable::Reset() include/rocksdb/cleanable.h:38
    https://github.com/facebook/rocksdb/issues/8 0xa78f0a in rocksdb::PinnedIteratorsManager::ReleasePinnedData() db/pinned_iterators_manager.h:71
    https://github.com/facebook/rocksdb/issues/9 0xd0c21b in rocksdb::PinnedIteratorsManager::~PinnedIteratorsManager() db/pinned_iterators_manager.h:24
    https://github.com/facebook/rocksdb/issues/10 0xd0c21b in rocksdb::Version::Get(rocksdb::ReadOptions const&, rocksdb::LookupKey const&, rocksdb::PinnableSlice*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, rocksdb::Status*, rocksdb::MergeContext*, unsigned long*, bool*, bool*, unsigned long*, rocksdb::ReadCallback*, bool*, bool) db/pinned_iterators_manager.h:22
    https://github.com/facebook/rocksdb/issues/11 0x7f0fdf in rocksdb::DBImpl::GetImpl(rocksdb::ReadOptions const&, rocksdb::Slice const&, rocksdb::DBImpl::GetImplOptions&) db/db_impl/db_impl.cc:1886
    https://github.com/facebook/rocksdb/issues/12 0x540d63 in rocksdb::DBImpl::GetMergeOperands(rocksdb::ReadOptions const&, rocksdb::ColumnFamilyHandle*, rocksdb::Slice const&, rocksdb::PinnableSlice*, rocksdb::GetMergeOperandsOptions*, int*) db/db_impl/db_impl.h:203

previously allocated by thread T0 here:
    https://github.com/facebook/rocksdb/issues/1 0x1239896 in rocksdb::AllocateBlock(unsigned long, **rocksdb::MemoryAllocator*)** memory/memory_allocator.h:35
    https://github.com/facebook/rocksdb/issues/2 0x1239896 in rocksdb::BlockFetcher::CopyBufferToHeapBuf() table/block_fetcher.cc:171
    https://github.com/facebook/rocksdb/issues/3 0x1239896 in rocksdb::BlockFetcher::GetBlockContents() table/block_fetcher.cc:206
    https://github.com/facebook/rocksdb/issues/4 0x122eae5 in rocksdb::BlockFetcher::ReadBlockContents() table/block_fetcher.cc:325
    https://github.com/facebook/rocksdb/issues/5 0x11b1f45 in rocksdb::Status rocksdb::BlockBasedTable::MaybeReadBlockAndLoadToCache<rocksdb::Block>(rocksdb::FilePrefetchBuffer*, rocksdb::ReadOptions const&, rocksdb::BlockHandle const&, rocksdb::UncompressionDict const&, bool, rocksdb::CachableEntry<rocksdb::Block>*, rocksdb::BlockType, rocksdb::GetContext*, rocksdb::BlockCacheLookupContext*, rocksdb::BlockContents*) const table/block_based/block_based_table_reader.cc:1503
```
Here is the analysis:
- We have [PinnedIteratorsManager](https://github.com/facebook/rocksdb/blob/6.28.fb/db/version_set.cc#L1980) with `Cleanable` capability in our `Version::Get()` path. It's responsible for managing the life-time of pinned iterator and invoking registered cleanup functions during its own destruction.
  - For example in case above, the merge operands's clean-up gets associated with this manger in [GetContext::push_operand](https://github.com/facebook/rocksdb/blob/6.28.fb/table/get_context.cc#L405). During PinnedIteratorsManager's [destruction](https://github.com/facebook/rocksdb/blob/6.28.fb/db/pinned_iterators_manager.h#L67), the release function associated with those merge operand data is invoked.
**And that's what we see in "freed by thread T955 here" in ASAN.**
- Bug 🐛: `PinnedIteratorsManager` is local to `Version::Get()`  while the data of merge operands need to outlive `Version::Get` and stay till they get [PinSelf()](https://github.com/facebook/rocksdb/blob/6.28.fb/db/db_impl/db_impl.cc#L1905), **which is the read-after-free in ASAN.**
  - This bug is likely to be an overlook of `PinnedIteratorsManager` when developing the API `DB::GetMergeOperands` cuz the current logic works fine with the existing case of getting the *merged value* where the operands do not need to live that long.
- This bug was not surfaced much (even in its unit test) due to the release function associated with the merge operands (which are actually blocks put in cache as you can see in `BlockBasedTable::MaybeReadBlockAndLoadToCache` **in "previously allocated by" in ASAN report**) is a cache entry deleter.
The deleter will call `Cache::Release()` which, for LRU cache, won't immediately deallocate the block based on LRU policy [unless the cache is full or being instructed to force erase](https://github.com/facebook/rocksdb/blob/6.28.fb/cache/lru_cache.cc#L521-L531)
  - `DBMergeOperandTest.MergeOperandReadAfterFreeBug` makes the cache extremely small to force cache full.

**Summary:**
- Fix the bug by align `PinnedIteratorsManager`'s lifetime with the merge operands

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9507

Test Plan:
- New test `DBMergeOperandTest.MergeOperandReadAfterFreeBug`
- db bench on read path
  - Setup (LSM tree with several levels, cache the whole db to avoid read IO, warm cache with readseq to avoid read IO): `TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks="fillrandom,readseq  -num=1000000 -cache_size=100000000  -write_buffer_size=10000 -statistics=1 -max_bytes_for_level_base=10000 -level0_file_num_compaction_trigger=1``TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks="readrandom" -num=1000000 -cache_size=100000000 `
  - Actual command run (run 20-run for 20 times and then average the 20-run's average micros/op)
     - `for j in {1..20}; do (for i in {1..20}; do rm -rf /dev/shm/rocksdb/ && TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks="fillrandom,readseq,readrandom" -num=1000000 -cache_size=100000000  -write_buffer_size=10000 -statistics=1 -max_bytes_for_level_base=10000 -level0_file_num_compaction_trigger=1 | egrep 'readrandom'; done > rr_output_pre.txt && (awk '{sum+=$3; sum_sqrt+=$3^2}END{print sum/20, sqrt(sum_sqrt/20-(sum/20)^2)}' rr_output_pre.txt) >> rr_output_pre_2.txt); done`
  - **Result: Pre-change: 3.79193 micros/op;   Post-change: 3.79528 micros/op (+0.09%)**

(pre-change)sorted avg micros/op of each 20-run | std of micros/op of each 20-run | (post-change) sorted avg micros/op of each 20-run | std of micros/op of each 20-run
-- | -- | -- | --
3.58355 | 0.265209 | 3.48715 | 0.382076
3.58845 | 0.519927 | 3.5832 | 0.382726
3.66415 | 0.452097 | 3.677 | 0.563831
3.68495 | 0.430897 | 3.68405 | 0.495355
3.70295 | 0.482893 | 3.68465 | 0.431438
3.719 | 0.463806 | 3.71945 | 0.457157
3.7393 | 0.453423 | 3.72795 | 0.538604
3.7806 | 0.527613 | 3.75075 | 0.444509
3.7817 | 0.426704 | 3.7683 | 0.468065
3.809 | 0.381033 | 3.8086 | 0.557378
3.80985 | 0.466011 | 3.81805 | 0.524833
3.8165 | 0.500351 | 3.83405 | 0.529339
3.8479 | 0.430326 | 3.86285 | 0.44831
3.85125 | 0.434108 | 3.8717 | 0.544098
3.8556 | 0.524602 | 3.895 | 0.411679
3.8656 | 0.476383 | 3.90965 | 0.566636
3.8911 | 0.488477 | 3.92735 | 0.608038
3.898 | 0.493978 | 3.9439 | 0.524511
3.97235 | 0.515008 | 3.9623 | 0.477416
3.9768 | 0.519993 | 3.98965 | 0.521481

- CI

Reviewed By: ajkr

Differential Revision: D34030519

Pulled By: hx235

fbshipit-source-id: a99ac585c11704c5ed93af033cb29ba0a7b16ae8
This commit is contained in:
Hui Xiao 2022-02-15 12:24:05 -08:00 committed by Andrew Kryczka
parent 82f1c1418b
commit e40bbc57db
7 changed files with 64 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
HISTORY.md
View File

@ -4,6 +4,7 @@
* Fixed a bug caused by race among flush, incoming writes and taking snapshots. Queries to snapshots created with these race condition can return incorrect result, e.g. resurfacing deleted data.
* Fix a race condition when cancel manual compaction with `DisableManualCompaction`. Also DB close can cancel the manual compaction thread.
* Fixed a data race on `versions_` between `DBImpl::ResumeImpl()` and threads waiting for recovery to complete (#9496)
* Fixed a read-after-free bug in `DB::GetMergeOperands()`.
## 6.29.3 (02/17/2022)
### Bug Fixes

21
db/db_impl/db_impl.cc
View File

@ -1912,11 +1912,12 @@ Status DBImpl::GetImpl(const ReadOptions& read_options, const Slice& key,
return s;
}
}
PinnedIteratorsManager pinned_iters_mgr;
if (!done) {
PERF_TIMER_GUARD(get_from_output_files_time);
sv->current->Get(
read_options, lkey, get_impl_options.value, timestamp, &s,
&merge_context, &max_covering_tombstone_seq,
&merge_context, &max_covering_tombstone_seq, &pinned_iters_mgr,
get_impl_options.get_value ? get_impl_options.value_found : nullptr,
nullptr, nullptr,
get_impl_options.get_value ? get_impl_options.callback : nullptr,
@ -2093,11 +2094,13 @@ std::vector<Status> DBImpl::MultiGet(
if (!done) {
PinnableSlice pinnable_val;
PERF_TIMER_GUARD(get_from_output_files_time);
super_version->current->Get(
read_options, lkey, &pinnable_val, timestamp, &s, &merge_context,
&max_covering_tombstone_seq, /*value_found=*/nullptr,
/*key_exists=*/nullptr,
/*seq=*/nullptr, read_callback);
PinnedIteratorsManager pinned_iters_mgr;
super_version->current->Get(read_options, lkey, &pinnable_val, timestamp,
&s, &merge_context,
&max_covering_tombstone_seq,
&pinned_iters_mgr, /*value_found=*/nullptr,
/*key_exists=*/nullptr,
/*seq=*/nullptr, read_callback);
value->assign(pinnable_val.data(), pinnable_val.size());
RecordTick(stats_, MEMTABLE_MISS);
}
@ -4560,10 +4563,12 @@ Status DBImpl::GetLatestSequenceForKey(
// SST files if cache_only=true?
if (!cache_only) {
// Check tables
PinnedIteratorsManager pinned_iters_mgr;
sv->current->Get(read_options, lkey, /*value=*/nullptr, timestamp, &s,
&merge_context, &max_covering_tombstone_seq,
nullptr /* value_found */, found_record_for_key, seq,
nullptr /*read_callback*/, is_blob_index);
&pinned_iters_mgr, nullptr /* value_found */,
found_record_for_key, seq, nullptr /*read_callback*/,
is_blob_index);
if (!(s.ok() || s.IsNotFound() || s.IsMergeInProgress())) {
// unexpected error reading SST files

3
db/db_impl/db_impl_readonly.cc
View File

@ -58,9 +58,10 @@ Status DBImplReadOnly::Get(const ReadOptions& read_options,
RecordTick(stats_, MEMTABLE_HIT);
} else {
PERF_TIMER_GUARD(get_from_output_files_time);
PinnedIteratorsManager pinned_iters_mgr;
super_version->current->Get(read_options, lkey, pinnable_val,
/*timestamp=*/nullptr, &s, &merge_context,
&max_covering_tombstone_seq);
&max_covering_tombstone_seq, &pinned_iters_mgr);
RecordTick(stats_, MEMTABLE_MISS);
}
RecordTick(stats_, NUMBER_KEYS_READ);

3
db/db_impl/db_impl_secondary.cc
View File

@ -377,9 +377,10 @@ Status DBImplSecondary::GetImpl(const ReadOptions& read_options,
}
if (!done) {
PERF_TIMER_GUARD(get_from_output_files_time);
PinnedIteratorsManager pinned_iters_mgr;
super_version->current->Get(read_options, lkey, pinnable_val,
/*timestamp=*/nullptr, &s, &merge_context,
&max_covering_tombstone_seq);
&max_covering_tombstone_seq, &pinned_iters_mgr);
RecordTick(stats_, MEMTABLE_MISS);
}
{

39
db/db_merge_operand_test.cc
View File

@ -47,6 +47,45 @@ class DBMergeOperandTest : public DBTestBase {
: DBTestBase("db_merge_operand_test", /*env_do_fsync=*/true) {}
};
TEST_F(DBMergeOperandTest, MergeOperandReadAfterFreeBug) {
// There was a bug of reading merge operands after they are mistakely freed
// in DB::GetMergeOperands, which is surfaced by cache full.
// See PR#9507 for more.
Options options;
options.create_if_missing = true;
options.merge_operator = MergeOperators::CreateStringAppendOperator();
options.env = env_;
BlockBasedTableOptions table_options;
// Small cache to simulate cache full
table_options.block_cache = NewLRUCache(1);
options.table_factory.reset(NewBlockBasedTableFactory(table_options));
Reopen(options);
int num_records = 4;
int number_of_operands = 0;
std::vector<PinnableSlice> values(num_records);
GetMergeOperandsOptions merge_operands_info;
merge_operands_info.expected_max_number_of_operands = num_records;
ASSERT_OK(Merge("k1", "v1"));
ASSERT_OK(Flush());
ASSERT_OK(Merge("k1", "v2"));
ASSERT_OK(Flush());
ASSERT_OK(Merge("k1", "v3"));
ASSERT_OK(Flush());
ASSERT_OK(Merge("k1", "v4"));
ASSERT_OK(db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(),
"k1", values.data(), &merge_operands_info,
&number_of_operands));
ASSERT_EQ(number_of_operands, 4);
ASSERT_EQ(values[0].ToString(), "v1");
ASSERT_EQ(values[1].ToString(), "v2");
ASSERT_EQ(values[2].ToString(), "v3");
ASSERT_EQ(values[3].ToString(), "v4");
}
TEST_F(DBMergeOperandTest, GetMergeOperandsBasic) {
Options options;
options.create_if_missing = true;

9
db/version_set.cc
View File

@ -1965,7 +1965,8 @@ void Version::MultiGetBlob(
void Version::Get(const ReadOptions& read_options, const LookupKey& k,
PinnableSlice* value, std::string* timestamp, Status* status,
MergeContext* merge_context,
SequenceNumber* max_covering_tombstone_seq, bool* value_found,
SequenceNumber* max_covering_tombstone_seq,
PinnedIteratorsManager* pinned_iters_mgr, bool* value_found,
bool* key_exists, SequenceNumber* seq, ReadCallback* callback,
bool* is_blob, bool do_merge) {
Slice ikey = k.internal_key();
@ -1978,7 +1979,6 @@ void Version::Get(const ReadOptions& read_options, const LookupKey& k,
*key_exists = true;
}
PinnedIteratorsManager pinned_iters_mgr;
uint64_t tracing_get_id = BlockCacheTraceHelper::kReservedGetId;
if (vset_ && vset_->block_cache_tracer_ &&
vset_->block_cache_tracer_->is_tracing_enabled()) {
@ -1992,17 +1992,18 @@ void Version::Get(const ReadOptions& read_options, const LookupKey& k,
bool* const is_blob_to_use = is_blob ? is_blob : &is_blob_index;
BlobFetcher blob_fetcher(this, read_options);
assert(pinned_iters_mgr);
GetContext get_context(
user_comparator(), merge_operator_, info_log_, db_statistics_,
status->ok() ? GetContext::kNotFound : GetContext::kMerge, user_key,
do_merge ? value : nullptr, do_merge ? timestamp : nullptr, value_found,
merge_context, do_merge, max_covering_tombstone_seq, clock_, seq,
merge_operator_ ? &pinned_iters_mgr : nullptr, callback, is_blob_to_use,
merge_operator_ ? pinned_iters_mgr : nullptr, callback, is_blob_to_use,
tracing_get_id, &blob_fetcher);
// Pin blocks that we read to hold merge operands
if (merge_operator_) {
pinned_iters_mgr.StartPinning();
pinned_iters_mgr->StartPinning();
}
FilePicker fp(user_key, ikey, &storage_info_.level_files_brief_,

2
db/version_set.h
View File

@ -708,9 +708,11 @@ class Version {
// If the key has any merge operands then store them in
// merge_context.operands_list and don't merge the operands
// REQUIRES: lock is not held
// REQUIRES: pinned_iters_mgr != nullptr
void Get(const ReadOptions&, const LookupKey& key, PinnableSlice* value,
std::string* timestamp, Status* status, MergeContext* merge_context,
SequenceNumber* max_covering_tombstone_seq,
PinnedIteratorsManager* pinned_iters_mgr,
bool* value_found = nullptr, bool* key_exists = nullptr,
SequenceNumber* seq = nullptr, ReadCallback* callback = nullptr,
bool* is_blob = nullptr, bool do_merge = true);