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feat(gov): handle panics when executing x/gov proposals #17780

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merged 10 commits into from
Sep 18, 2023
Merged

feat(gov): handle panics when executing x/gov proposals #17780

merged 10 commits into from
Sep 18, 2023

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robert-zaremba
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Description

x/gov proposal execution is done in ABCI EndBlock. Proposals contain a custom, potentially untrusted code, which can panic, and putting the whole chain down.

Today, the proposal handler execution is not recoverable, making the chain halt rather than erroring the proposal executing.

In this PR I propose to guard the Msg handler executing in a recoverable block, safely failing the proposal if the panics occurs.

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  • added a changelog entry to CHANGELOG.md
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@robert-zaremba robert-zaremba requested a review from a team as a code owner September 18, 2023 07:59
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NOTE: I'm adding backport to v0.50, I think it should be backported (v0.50 is not yet released).

@robert-zaremba robert-zaremba added C:x/gov T:tech debt Tech debt that should be cleaned up backport/v0.50.x PR scheduled for inclusion in the v0.50's next stable release labels Sep 18, 2023
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tac0turtle
tac0turtle approved these changes Sep 18, 2023
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thank you for adding this, the change makes sense same with the backport

julienrbrt
julienrbrt reviewed Sep 18, 2023
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x/gov/abci.go Outdated

defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("handling x/gov poposal msg [%s] PANICED: %v", msg, r)
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Typo here?

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updated

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There is another typo I think PANICED -> PANICKED

x/gov/abci.go Show resolved Hide resolved
odeke-em
odeke-em requested changes Sep 18, 2023
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Thanks for the PR @robert-zaremba and nice to catch you here after a very long time!

For the commit message and change log entries, please use this

Recover panics and turn them into errors when executing x/gov proposals

Otherwise LGTM. Thank you

x/gov/abci.go Outdated Show resolved Hide resolved
CHANGELOG.md Outdated
@@ -46,6 +46,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
* (x/bank) [#17569](https://github.com/cosmos/cosmos-sdk/pull/17569) Introduce a new message type, `MsgBurn `, to burn coins.
* (genutil) [#17571](https://github.com/cosmos/cosmos-sdk/pull/17571) Allow creation of `AppGenesis` without a file lookup.
* (server) [#17094](https://github.com/cosmos/cosmos-sdk/pull/17094) Add duration `shutdown-grace` for resource clean up (closing database handles) before exit.
* (x/gov) [#17780](https://github.com/cosmos/cosmos-sdk/pull/17780) Handle panics when executing x/gov proposals.
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Recover panics and turn them into errors when executing x/gov proposals

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@odeke-em thanks for suggestion. I will update the changelog. However I don't think this kind of comment should be blocking, because now we need to wait for you to unblock.

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I'm thinking more about the backports. What do you think about backporting to 0.47? I think it won't break consensus, because nodes which won't upgrade will halt, without submitting any change, and nodes which will update will continue. So we won't have hash missmatch. Nodes which failed, after update will continue safely.

julienrbrt
julienrbrt approved these changes Sep 18, 2023
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lgtm!

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Could you run make lint-fix?

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I'm thinking more about the backports. What do you think about backporting to 0.47? I think it won't break consensus, because nodes which won't upgrade will halt, without submitting any change, and nodes which will update will continue. So we won't have hash missmatch. Nodes which failed, after update will continue safely.

@julienrbrt , @tac0turtle could you 👍 about the proposal to backport to v0.47 as well?

@robert-zaremba robert-zaremba added this pull request to the merge queue Sep 18, 2023
Merged via the queue into main with commit a0b39a1 Sep 18, 2023
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@robert-zaremba robert-zaremba deleted the robert/handle-gov-panics branch September 18, 2023 15:07
mergify bot pushed a commit that referenced this pull request Sep 18, 2023
@robert-zaremba @mergify
feat(gov): handle panics when executing x/gov proposals (#17780)
00a55ad 
(cherry picked from commit a0b39a1)

# Conflicts:
#	CHANGELOG.md
@mergify mergify bot mentioned this pull request Sep 18, 2023
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Your reasoning makes sense, this behavior change would not be consensus breaking, unless I am missing something (cc @alexanderbez). So that would make sense to backport to v0.47.

tac0turtle pushed a commit that referenced this pull request Sep 18, 2023
@mergify @robert-zaremba @julienrbrt
feat(gov): handle panics when executing x/gov proposals (backport #17780
87ba5a6 
) (#17790)

Co-authored-by: Robert Zaremba <robert@zaremba.ch>
Co-authored-by: Julien Robert <julien@rbrt.fr>
@robert-zaremba robert-zaremba added the backport/v0.47.x PR scheduled for inclusion in the v0.47's next stable release label Sep 18, 2023
mergify bot pushed a commit that referenced this pull request Sep 18, 2023
@robert-zaremba @mergify
feat(gov): handle panics when executing x/gov proposals (#17780)
43e0ebb 
(cherry picked from commit a0b39a1)

# Conflicts:
#	CHANGELOG.md
#	x/gov/abci.go
@mergify mergify bot mentioned this pull request Sep 18, 2023
Merged
julienrbrt added a commit that referenced this pull request Sep 18, 2023
@mergify @robert-zaremba @julienrbrt
feat(gov): handle panics when executing x/gov proposals (backport #17780
80705f7 
) (#17793)

Co-authored-by: Robert Zaremba <robert@zaremba.ch>
Co-authored-by: Julien Robert <julien@rbrt.fr>
mmsqe pushed a commit to mmsqe/cosmos-sdk that referenced this pull request Oct 9, 2023
@mergify @robert-zaremba
@julienrbrt @mmsqe
feat(gov): handle panics when executing x/gov proposals (backport cos…
26ea71b 
…mos#17780) (cosmos#17793)

Co-authored-by: Robert Zaremba <robert@zaremba.ch>
Co-authored-by: Julien Robert <julien@rbrt.fr>
@faddat faddat mentioned this pull request Mar 20, 2024
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@odeke-em odeke-em odeke-em approved these changes

@tac0turtle tac0turtle tac0turtle approved these changes

@julienrbrt julienrbrt julienrbrt approved these changes

@facundomedica facundomedica Awaiting requested review from facundomedica

@samricotta samricotta Awaiting requested review from samricotta

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backport/v0.47.x PR scheduled for inclusion in the v0.47's next stable release backport/v0.50.x PR scheduled for inclusion in the v0.50's next stable release C:x/gov T:tech debt Tech debt that should be cleaned up
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