in consensus/state.go, when calulating metrics, retrieve address (ergo, pubkey) once prior to iterating over validatorset to ensure we do not make excessive calls to signer.
Partially closes: #4865
Closes#4926
The dump consensus state had this:
"last_commit": {
"votes": [
"Vote{0:04CBBF43CA3E 385085/00/2(Precommit) 1B73DA9FC4C8 42C97B86D89D @ 2020-05-27T06:46:51.042392895Z}",
"Vote{1:055799E028FA 385085/00/2(Precommit) 652B08AD61EA 0D507D7FA3AB @ 2020-06-28T04:57:29.20793209Z}",
"Vote{2:056024CFA910 385085/00/2(Precommit) 652B08AD61EA C8E95532A4C3 @ 2020-06-28T04:57:29.452696998Z}",
"Vote{3:0741C95814DA 385085/00/2(Precommit) 652B08AD61EA 36D567615F7C @ 2020-06-28T04:57:29.279788593Z}",
Note there's a precommit in there from the first val from May (2020-05-27) while the rest are from today (2020-06-28). It suggests there's a validator from an old instance of the network at this height (they're using the same chain-id!). Obviously a single bad validator shouldn't be an issue. But the Commit refactor work introduced a bug.
When we propose a block, we get the block.LastCommit by calling MakeCommit on the set of precommits we saw for the last height. This set may include precommits for a different block, and hence the block.LastCommit we propose may include precommits that aren't actually for the last block (but of course +2/3 will be). Before v0.33, we just skipped over these precommits during verification. But in v0.33, we expect all signatures for a blockID to be for the same block ID! Thus we end up proposing a block that we can't verify.
Since the light client work introduced in v0.33 it appears full nodes
are no longer fully verifying commit signatures during block execution -
they stop after +2/3. See in VerifyCommit:
0c7fd316eb/types/validator_set.go (L700-L703)
This means proposers can propose blocks that contain valid +2/3
signatures and then the rest of the signatures can be whatever they
want. They can claim that all the other validators signed just by
including a CommitSig with arbitrary signature data. While this doesn't
seem to impact safety of Tendermint per se, it means that Commits may
contain a lot of invalid data. This is already true of blocks, since
they can include invalid txs filled with garbage, but in that case the
application knows they they are invalid and can punish the proposer. But
since applications dont verify commit signatures directly (they trust
tendermint to do that), they won't be able to detect it.
This can impact incentivization logic in the application that depends on
the LastCommitInfo sent in BeginBlock, which includes which validators
signed. For instance, Gaia incentivizes proposers with a bonus for
including more than +2/3 of the signatures. But a proposer can now claim
that bonus just by including arbitrary data for the final -1/3 of
validators without actually waiting for their signatures. There may be
other tricks that can be played because of this.
In general, the full node should be a fully verifying machine. While
it's true that the light client can avoid verifying all signatures by
stopping after +2/3, the full node can not. Thus the light client and
full node should use distinct VerifyCommit functions if one is going to
stop after +2/3 or otherwise perform less validation (for instance light
clients can also skip verifying votes for nil while full nodes can not).
See a commit with a bad signature that verifies here: 56367fd. From what
I can tell, Tendermint will go on to think this commit is valid and
forward this data to the app, so the app will think the second validator
actually signed when it clearly did not.
Fixes#4802. The Go HTTP server has a global panic handler for requests, so it was not as severe as first thought.
This fix can still panic, since we try to send a `500` response - if that happens, the Go HTTP server will terminate the connection. Otherwise, the client will get a 200 response, which we should avoid. I'm sort of torn on whether it's even necessary to include this fix, instead of just letting the HTTP server deal with it.
* blockchain/v2: fix excessive CPU usage due to spinning on closed channels (#4761)
The event loop uses a `select` on multiple channels. However, reading from a closed channel in Go always yields the channel's zero value. The processor and scheduler close their channels when done, and since these channels are always ready to receive, the event loop keeps spinning on them.
This changes `routine.terminate()` to not close the channel, and also removes `stopDemux` and instead uses `events` channel closure to signal event loop termination.
Fixes#4687.
* blockchain/v2: respect fast_sync option (#4772)
Not thoroughly tested, but seems to work. Will do further testing as this is integrated with state sync.
Fixes#4688.
* lite: fix HTTP provider error handling
Fixes#4739, kind of. See #4740 for the proper fix.
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* adapt tests to missing pull request
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
Reduce the number of targets and make the buildsystem more
flexible by parsing the TENDERMINT_BUILD_OPTIONS command
line variable (a-la Debian, inspired by dpkg-buildpackage's
DEB_BUILD_OPTIONS), e.g:
$ make install TENDERMINT_BUILD_OPTIONS='cleveldb'
replaces the old:
$ make install_c
Options can be mix&match'd, e.g.:
$ make install TENDERMINT_BUILD_OPTIONS='cleveldb race nostrip'
Three options are available:
- nostrip: don't strip debugging symbols nor DWARF tables.
- cleveldb: use cleveldb as db backend instead of goleveldb;
it switches on the CGO_ENABLED Go environment variale.
- race: pass -race to go build and enable data race detection.
This changeset is a port of gaia pull request: cosmos/gaia#363.
Co-authored-by: Alessio Treglia <alessio@tendermint.com>
- Move core stateless validation of the Header type to a ValidateBasic method.
- Call header.ValidateBasic during a SignedHeader validation.
- Call header.ValidateBasic during a PhantomValidatorEvidence validation.
- Call header.ValidateBasic during a LunaticValidatorEvidence validation.
lite tests are skipped since the package is deprecated, no need to waste time on it
closes: #4572
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
Closes: #4695
Verify /block_results and /validators responses from an HTTP client using the light client.
Added count and total to /validators response.
Refs #3113
in TestPEXReactorDialsPeerUpToMaxAttemptsInSeedMode
Closes#4668
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## Description
move tests for abci_cli, abci_app and app_tests to github actions
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Followup from #4588. Allow the first `SaveBlock()` call in an empty block store to be at any height, to start from a truncated block history. Subsequent `SaveBlock()` calls must be for contiguous blocks.
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The service logging can be a bit unclear. For example, with state sync it would log:
```
I[2020-04-20|08:40:47.366] Starting StateSync module=statesync impl=Reactor
I[2020-04-20|08:40:47.834] Starting state sync module=statesync
```
Where the first message is the reactor service startup, and the second message is the start of the actual state sync process. This clarifies the first message by changing it to `Starting StateSync service`.
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See #4588 for original change.
I believe this is appropriate. Anything else that needs to be updated?
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## Description
ADR to address the process for proving an amnesia attack (as a form of global evidence) from `PotentialAmnesiaEvidence` detected by light clients
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## Description
The minor release process is changing in order to not have major release changes sitting in the pull request tab.
This changes from taking master and releasing from master to creating a branch that you cherry-pick commits into.
There are two options on labeling which pull requests to include in a minor release:
1. Use the label `R:minor` to know which pull requests to include then remove the label when those pull requests have been included in a release.
2. Create an Issue where pull request numbers are added. then the issue is closed when the release is done.
this process should be followed after 0.33.3
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## Description
Fixes a bug where the reactor would broadcast a base with height=0.
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