pvf-precheck: update configuration module #4420

pepyakin · 2021-11-30T15:48:39Z

This PR is a part of #3211.

This PR adds three new fields into the HostConfiguration structure.
The fields are going to be used in PRs down the stack.

This change requires migration, so this PR performs runtime storage
migration for configuration module from version 1 to version 2. Migration was performed in very similar manner to #3575.

This PR closes #4010 and subsumes #4177.

There are several TODOs:

Fill in the PR number for the reference in migration code
Decide what weight use for set_pvf_checking_enabled. It seems
that u32 will be close enough, but maybe we still want to add weight
for boolean parameters (prolly a followup)
Test the upgrade (tested it manually by running a local polkadot-launch node and slapping an upgrade)

skip check-dependent-cumulus

pepyakin · 2021-11-30T15:48:44Z

Current dependencies on/for this PR:

master
- PR pvf-precheck: update configuration module #4420 (this PR)
  - PR pvf-precheck: Integrate PVF pre-checking into paras module #4457
    - PR paras: add log target #4478
    - PR pvf-precheck: update rustdoc for paras module #4459

This comment was auto-generated by Graphite and will continue to be automatically updated while this PR remains open.

KiChjang

Feel like we should have something similar to database migration files a la Ruby on Rails, removing old migration code sounds kind of wrong to me but can understand why it makes sense in the blockchain world. Anyway, it's a larger discussion and shouldn't block this PR from landing.

KiChjang · 2021-11-30T21:25:19Z

runtime/parachains/src/configuration.rs

+
+		/// Enable or disable PVF pre-checking. Consult the field documentation prior executing.
+		#[pallet::weight((
+			T::WeightInfo::set_config_with_u32(), // TODO: should we change that to bool?


This should be fine, the code for setting a u32 vs setting a boolean is pretty much identical, aside from the fact that they're different data types... perhaps we could rename the weighing function into something else to make it more clear? I just don't really have a good name, uhh maybe set_config_with_primitive_type?

Hm, looking at the trait WeightInfo I see that there are several items that could have the name set_config_with_primitive_type. E.g. I don't think that there is a really big difference between with_option_u32 and with_u32. I do not see a weights.rs file, it would be interesting to see the actual numbers there.

Right now I just removed this todo and added a comment that it should be fine. I think this could be addressed in a follow-up. We can continue the discussion here though.

rphmeier · 2021-11-30T21:49:26Z

runtime/parachains/src/configuration.rs

@@ -222,6 +247,9 @@ impl<BlockNumber: Default + From<u32>> Default for HostConfiguration<BlockNumber
 			hrmp_max_parathread_outbound_channels: Default::default(),
 			hrmp_max_message_num_per_candidate: Default::default(),
 			ump_max_individual_weight: 20 * WEIGHT_PER_MILLIS,
+			pvf_checking_enabled: false,
+			pvf_voting_ttl: 2u32.into(),
+			minimum_validation_upgrade_delay: 0.into(),


#4248

Affected by this?

I think it may be related, but not completely: the paras changes (to be submitted in the next diff) will actually behave the same way at it does now with this configuration defaults.

Closes #4009 This is the most of the runtime-side change needed for #3211. Here is how it works. The PVF pre-checking can be triggered either by an upgrade or by onboarding (i.e. calling `schedule_para_initialize`). The PVF pre-checking process is identified by the PVF code hash that is being voted on. If there is already PVF pre-checking process running, then no new PVF pre-checking process will be started. Instead, we just subscribe to the existing one. If there is no PVF pre-checking process running but the PVF code hash was already saved in the storage, that necessarily means (I invite the reviewers to double-check this invariant) that the PVF already passed pre-checking. This is equivalent to instant approving of the PVF. The pre-checking process can be concluded either by obtaining a supermajority or if it expires. Each validator checks the list of PVFs available for voting. The vote is binary, i.e. accept or reject a given PVF. As soon as the supermajority of votes are collected for one of the sides of the vote, the voting is concluded in that direction and the effects of the voting are enacted. Only validators from the active set can participate in the vote. The set of active validators can change each session. That's why we reset the votes each session. A voting that observed a certain number of sessions will be rejected. The effects of the PVF accepting depend on the operations requested it: 1. All onboardings subscribed to the approved PVF pre-checking process will get scheduled and after passing 2 session boundaries they will be onboarded. 2. All upgrades subscribed to the approved PVF pre-checking process will get scheduled very similarly to the existing process. Upgrades with pre-checking are really the same process that is just delayed by the time required for pre-checking voting. In case of instant approval the mechanism is exactly the same. This is important from parachains compatibility standpoint since following the delayed upgrade requires the parachain to implement paritytech/cumulus#517. In case, PVF pre-checking process was concluded with rejection, then all the requesting operations get cancelled. For onboarding it means it gets without movement: the lifecycle of such parachain is terminated on the `Onboarding` state and after rejection the lifecycle is none. That in turn means that the caller can attempt registering the parachain once more. For upgrading it means that the upgrade process is aborted: that flashes go-ahead signal with `Abort` flag. Rejection leads to removing the allegedly bad validation code from the chain storage. Among other things, this implies that the operation can be re-requested. That allows for retrying an operation in case there was some bug. At the same time it does not look as a DoS vector due to the caching performed by the nodes. PVF pre-checking can be enabled and disabled. Initially, according to the changes in #4420, this mechanism is disabled. Triggering the PVF pre-checking when it is disabled just means that we insta approve the requesting operation. This should lead to the behavior being unchanged. Follow-ups: - expose runtime APIs

This PR is a part of #3211. This PR adds three new fields into the `HostConfiguration` structure. The fields are going to be used in PRs down the stack. This change requires migration, so this PR performs runtime storage migration for configuration module from version 1 to version 2. This PR closes #4010 and subsumes #4177.

Closes #4009 This is the most of the runtime-side change needed for #3211. Here is how it works. The PVF pre-checking can be triggered either by an upgrade or by onboarding (i.e. calling `schedule_para_initialize`). The PVF pre-checking process is identified by the PVF code hash that is being voted on. If there is already PVF pre-checking process running, then no new PVF pre-checking process will be started. Instead, we just subscribe to the existing one. If there is no PVF pre-checking process running but the PVF code hash was already saved in the storage, that necessarily means (I invite the reviewers to double-check this invariant) that the PVF already passed pre-checking. This is equivalent to instant approving of the PVF. The pre-checking process can be concluded either by obtaining a supermajority or if it expires. Each validator checks the list of PVFs available for voting. The vote is binary, i.e. accept or reject a given PVF. As soon as the supermajority of votes are collected for one of the sides of the vote, the voting is concluded in that direction and the effects of the voting are enacted. Only validators from the active set can participate in the vote. The set of active validators can change each session. That's why we reset the votes each session. A voting that observed a certain number of sessions will be rejected. The effects of the PVF accepting depend on the operations requested it: 1. All onboardings subscribed to the approved PVF pre-checking process will get scheduled and after passing 2 session boundaries they will be onboarded. 2. All upgrades subscribed to the approved PVF pre-checking process will get scheduled very similarly to the existing process. Upgrades with pre-checking are really the same process that is just delayed by the time required for pre-checking voting. In case of instant approval the mechanism is exactly the same. This is important from parachains compatibility standpoint since following the delayed upgrade requires the parachain to implement paritytech/cumulus#517. In case, PVF pre-checking process was concluded with rejection, then all the requesting operations get cancelled. For onboarding it means it gets without movement: the lifecycle of such parachain is terminated on the `Onboarding` state and after rejection the lifecycle is none. That in turn means that the caller can attempt registering the parachain once more. For upgrading it means that the upgrade process is aborted: that flashes go-ahead signal with `Abort` flag. Rejection leads to removing the allegedly bad validation code from the chain storage. Among other things, this implies that the operation can be re-requested. That allows for retrying an operation in case there was some bug. At the same time it does not look as a DoS vector due to the caching performed by the nodes. PVF pre-checking can be enabled and disabled. Initially, according to the changes in #4420, this mechanism is disabled. Triggering the PVF pre-checking when it is disabled just means that we insta approve the requesting operation. This should lead to the behavior being unchanged. Follow-ups: - expose runtime APIs

pepyakin · 2021-12-08T14:49:57Z

bot merge

Closes #4009 This is the most of the runtime-side change needed for #3211. Here is how it works. The PVF pre-checking can be triggered either by an upgrade or by onboarding (i.e. calling `schedule_para_initialize`). The PVF pre-checking process is identified by the PVF code hash that is being voted on. If there is already PVF pre-checking process running, then no new PVF pre-checking process will be started. Instead, we just subscribe to the existing one. If there is no PVF pre-checking process running but the PVF code hash was already saved in the storage, that necessarily means (I invite the reviewers to double-check this invariant) that the PVF already passed pre-checking. This is equivalent to instant approving of the PVF. The pre-checking process can be concluded either by obtaining a supermajority or if it expires. Each validator checks the list of PVFs available for voting. The vote is binary, i.e. accept or reject a given PVF. As soon as the supermajority of votes are collected for one of the sides of the vote, the voting is concluded in that direction and the effects of the voting are enacted. Only validators from the active set can participate in the vote. The set of active validators can change each session. That's why we reset the votes each session. A voting that observed a certain number of sessions will be rejected. The effects of the PVF accepting depend on the operations requested it: 1. All onboardings subscribed to the approved PVF pre-checking process will get scheduled and after passing 2 session boundaries they will be onboarded. 2. All upgrades subscribed to the approved PVF pre-checking process will get scheduled very similarly to the existing process. Upgrades with pre-checking are really the same process that is just delayed by the time required for pre-checking voting. In case of instant approval the mechanism is exactly the same. This is important from parachains compatibility standpoint since following the delayed upgrade requires the parachain to implement paritytech/cumulus#517. In case, PVF pre-checking process was concluded with rejection, then all the requesting operations get cancelled. For onboarding it means it gets without movement: the lifecycle of such parachain is terminated on the `Onboarding` state and after rejection the lifecycle is none. That in turn means that the caller can attempt registering the parachain once more. For upgrading it means that the upgrade process is aborted: that flashes go-ahead signal with `Abort` flag. Rejection leads to removing the allegedly bad validation code from the chain storage. Among other things, this implies that the operation can be re-requested. That allows for retrying an operation in case there was some bug. At the same time it does not look as a DoS vector due to the caching performed by the nodes. PVF pre-checking can be enabled and disabled. Initially, according to the changes in #4420, this mechanism is disabled. Triggering the PVF pre-checking when it is disabled just means that we insta approve the requesting operation. This should lead to the behavior being unchanged. Follow-ups: - expose runtime APIs

* pvf-precheck: Integrate PVF pre-checking into paras module Closes #4009 This is the most of the runtime-side change needed for #3211. Here is how it works. The PVF pre-checking can be triggered either by an upgrade or by onboarding (i.e. calling `schedule_para_initialize`). The PVF pre-checking process is identified by the PVF code hash that is being voted on. If there is already PVF pre-checking process running, then no new PVF pre-checking process will be started. Instead, we just subscribe to the existing one. If there is no PVF pre-checking process running but the PVF code hash was already saved in the storage, that necessarily means (I invite the reviewers to double-check this invariant) that the PVF already passed pre-checking. This is equivalent to instant approving of the PVF. The pre-checking process can be concluded either by obtaining a supermajority or if it expires. Each validator checks the list of PVFs available for voting. The vote is binary, i.e. accept or reject a given PVF. As soon as the supermajority of votes are collected for one of the sides of the vote, the voting is concluded in that direction and the effects of the voting are enacted. Only validators from the active set can participate in the vote. The set of active validators can change each session. That's why we reset the votes each session. A voting that observed a certain number of sessions will be rejected. The effects of the PVF accepting depend on the operations requested it: 1. All onboardings subscribed to the approved PVF pre-checking process will get scheduled and after passing 2 session boundaries they will be onboarded. 2. All upgrades subscribed to the approved PVF pre-checking process will get scheduled very similarly to the existing process. Upgrades with pre-checking are really the same process that is just delayed by the time required for pre-checking voting. In case of instant approval the mechanism is exactly the same. This is important from parachains compatibility standpoint since following the delayed upgrade requires the parachain to implement paritytech/cumulus#517. In case, PVF pre-checking process was concluded with rejection, then all the requesting operations get cancelled. For onboarding it means it gets without movement: the lifecycle of such parachain is terminated on the `Onboarding` state and after rejection the lifecycle is none. That in turn means that the caller can attempt registering the parachain once more. For upgrading it means that the upgrade process is aborted: that flashes go-ahead signal with `Abort` flag. Rejection leads to removing the allegedly bad validation code from the chain storage. Among other things, this implies that the operation can be re-requested. That allows for retrying an operation in case there was some bug. At the same time it does not look as a DoS vector due to the caching performed by the nodes. PVF pre-checking can be enabled and disabled. Initially, according to the changes in #4420, this mechanism is disabled. Triggering the PVF pre-checking when it is disabled just means that we insta approve the requesting operation. This should lead to the behavior being unchanged. Follow-ups: - expose runtime APIs * cargo run --quiet --release --features=runtime-benchmarks -- benchmark --chain=polkadot-dev --steps=50 --repeat=20 --pallet=runtime_parachains::paras --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --header=./file_header.txt --output=./runtime/polkadot/src/weights/runtime_parachains_paras.rs * cargo run --quiet --release --features=runtime-benchmarks -- benchmark --chain=westend-dev --steps=50 --repeat=20 --pallet=runtime_parachains::paras --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --header=./file_header.txt --output=./runtime/westend/src/weights/runtime_parachains_paras.rs * cargo run --quiet --release --features=runtime-benchmarks -- benchmark --chain=kusama-dev --steps=50 --repeat=20 --pallet=runtime_parachains::paras --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --header=./file_header.txt --output=./runtime/kusama/src/weights/runtime_parachains_paras.rs * cargo run --quiet --release --features runtime-benchmarks -- benchmark --chain=rococo-dev --steps=50 --repeat=20 --pallet=runtime_parachains::paras --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --header=./file_header.txt --output=./runtime/rococo/src/weights/runtime_parachains_paras.rs * Review fixes Co-authored-by: Parity Bot <admin@parity.io>

As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: #4420 (comment)

* pvf-precheck: Integrate PVF pre-checking into paras module Closes #4009 This is the most of the runtime-side change needed for #3211. Here is how it works. The PVF pre-checking can be triggered either by an upgrade or by onboarding (i.e. calling `schedule_para_initialize`). The PVF pre-checking process is identified by the PVF code hash that is being voted on. If there is already PVF pre-checking process running, then no new PVF pre-checking process will be started. Instead, we just subscribe to the existing one. If there is no PVF pre-checking process running but the PVF code hash was already saved in the storage, that necessarily means (I invite the reviewers to double-check this invariant) that the PVF already passed pre-checking. This is equivalent to instant approving of the PVF. The pre-checking process can be concluded either by obtaining a supermajority or if it expires. Each validator checks the list of PVFs available for voting. The vote is binary, i.e. accept or reject a given PVF. As soon as the supermajority of votes are collected for one of the sides of the vote, the voting is concluded in that direction and the effects of the voting are enacted. Only validators from the active set can participate in the vote. The set of active validators can change each session. That's why we reset the votes each session. A voting that observed a certain number of sessions will be rejected. The effects of the PVF accepting depend on the operations requested it: 1. All onboardings subscribed to the approved PVF pre-checking process will get scheduled and after passing 2 session boundaries they will be onboarded. 2. All upgrades subscribed to the approved PVF pre-checking process will get scheduled very similarly to the existing process. Upgrades with pre-checking are really the same process that is just delayed by the time required for pre-checking voting. In case of instant approval the mechanism is exactly the same. This is important from parachains compatibility standpoint since following the delayed upgrade requires the parachain to implement paritytech/cumulus#517. In case, PVF pre-checking process was concluded with rejection, then all the requesting operations get cancelled. For onboarding it means it gets without movement: the lifecycle of such parachain is terminated on the `Onboarding` state and after rejection the lifecycle is none. That in turn means that the caller can attempt registering the parachain once more. For upgrading it means that the upgrade process is aborted: that flashes go-ahead signal with `Abort` flag. Rejection leads to removing the allegedly bad validation code from the chain storage. Among other things, this implies that the operation can be re-requested. That allows for retrying an operation in case there was some bug. At the same time it does not look as a DoS vector due to the caching performed by the nodes. PVF pre-checking can be enabled and disabled. Initially, according to the changes in #4420, this mechanism is disabled. Triggering the PVF pre-checking when it is disabled just means that we insta approve the requesting operation. This should lead to the behavior being unchanged. Follow-ups: - expose runtime APIs * cargo run --quiet --release --features=runtime-benchmarks -- benchmark --chain=polkadot-dev --steps=50 --repeat=20 --pallet=runtime_parachains::paras --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --header=./file_header.txt --output=./runtime/polkadot/src/weights/runtime_parachains_paras.rs * cargo run --quiet --release --features=runtime-benchmarks -- benchmark --chain=westend-dev --steps=50 --repeat=20 --pallet=runtime_parachains::paras --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --header=./file_header.txt --output=./runtime/westend/src/weights/runtime_parachains_paras.rs * cargo run --quiet --release --features=runtime-benchmarks -- benchmark --chain=kusama-dev --steps=50 --repeat=20 --pallet=runtime_parachains::paras --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --header=./file_header.txt --output=./runtime/kusama/src/weights/runtime_parachains_paras.rs * cargo run --quiet --release --features runtime-benchmarks -- benchmark --chain=rococo-dev --steps=50 --repeat=20 --pallet=runtime_parachains::paras --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --header=./file_header.txt --output=./runtime/rococo/src/weights/runtime_parachains_paras.rs * Review fixes Co-authored-by: Parity Bot <admin@parity.io>

As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: #4420 (comment)

As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: paritytech#4420 (comment)

As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: paritytech/polkadot#4420 (comment)

This was referenced Nov 30, 2021

pvf-precheck: Candidate Validation Changes #4409

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pvf-precheck: Strip PastCodeMeta #4408

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Add pre-checking into the configuration runtime module #4010

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pvf-precheck: Integrate PVF pre-checking into paras module #4457

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pvf-precheck: update rustdoc for paras module #4459

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pepyakin added this to the v0.9.16 milestone Dec 21, 2021

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parachains: Fix configuration module #4540

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configuration: Consistency checks for PVF pre-checking

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As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: #4420 (comment)

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configuration: Consistency checks for PVF pre-checking #4580

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configuration: Consistency checks for PVF pre-checking

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As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: #4420 (comment)

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configuration: Consistency checks for PVF pre-checking

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As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: #4420 (comment)

pepyakin added a commit that referenced this pull request Dec 27, 2021

configuration: Consistency checks for PVF pre-checking

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As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: #4420 (comment)

pepyakin added a commit that referenced this pull request Dec 28, 2021

configuration: Consistency checks for PVF pre-checking (#4580)

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As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: #4420 (comment)

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configuration: Consistency checks for PVF pre-checking (#4580)

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As was suggested by Alexander Popiak [here][comment], this commit checks the consistency of the configuration. [comment]: #4420 (comment)

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Update substrate/polkadot/cumulus from v0.9.15 to v0.9.16 moonbeam-foundation/moonbeam#1259

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