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

robert-zaremba · 2023-09-18T07:59:36Z

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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robert-zaremba · 2023-09-18T08:00:41Z

NOTE: I'm adding backport to v0.50, I think it should be backported (v0.50 is not yet released).

tac0turtle

thank you for adding this, the change makes sense same with the backport

julienrbrt · 2023-09-18T08:33:25Z

x/gov/abci.go

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


There is another typo I think PANICED -> PANICKED

x/gov/abci.go

odeke-em

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

odeke-em · 2023-09-18T10:05:53Z

CHANGELOG.md

@@ -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.


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

@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.

robert-zaremba · 2023-09-18T12:46:45Z

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

lgtm!

julienrbrt · 2023-09-18T13:28:05Z

Could you run make lint-fix?

robert-zaremba · 2023-09-18T14:48:14Z

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?

(cherry picked from commit a0b39a1) # Conflicts: # CHANGELOG.md

julienrbrt · 2023-09-18T15:09:16Z

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.

) (#17790) Co-authored-by: Robert Zaremba <robert@zaremba.ch> Co-authored-by: Julien Robert <julien@rbrt.fr>

(cherry picked from commit a0b39a1) # Conflicts: # CHANGELOG.md # x/gov/abci.go

) (#17793) Co-authored-by: Robert Zaremba <robert@zaremba.ch> Co-authored-by: Julien Robert <julien@rbrt.fr>

…mos#17780) (cosmos#17793) Co-authored-by: Robert Zaremba <robert@zaremba.ch> Co-authored-by: Julien Robert <julien@rbrt.fr>

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

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robert-zaremba requested a review from a team as a code owner September 18, 2023 07:59

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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robert-zaremba added 3 commits September 18, 2023 14:38

TestSafeExecuteHandler

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update changelog

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Merge branch 'main' into robert/handle-gov-panics

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Merged via the queue into main with commit a0b39a1 Sep 18, 2023
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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

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

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(cherry picked from commit a0b39a1) # Conflicts: # CHANGELOG.md

mergify bot mentioned this pull request Sep 18, 2023

feat(gov): handle panics when executing x/gov proposals (backport #17780) #17790

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tac0turtle pushed a commit that referenced this pull request Sep 18, 2023

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

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) (#17790) Co-authored-by: Robert Zaremba <robert@zaremba.ch> Co-authored-by: Julien Robert <julien@rbrt.fr>

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

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

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(cherry picked from commit a0b39a1) # Conflicts: # CHANGELOG.md # x/gov/abci.go

mergify bot mentioned this pull request Sep 18, 2023

feat(gov): handle panics when executing x/gov proposals (backport #17780) #17793

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

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) (#17793) Co-authored-by: Robert Zaremba <robert@zaremba.ch> Co-authored-by: Julien Robert <julien@rbrt.fr>

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

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

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

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