reject empty SetCode auth list

[codchen]

Summary

Reject SetCode transactions with nil or empty authorization lists during Sei EVM tx validation, so CheckTx no longer accepts transactions that DeliverTx later rejects through Geth's EIP-7702 stateless checks.

The same guard is mirrored in the Giga EVM tx-type copy to keep validation behavior aligned.

Root Cause

SetCodeTx.Validate() delegated to validateAuthList(), which iterated over the list but treated nil and empty lists as valid. CheckTx runs Sei's stateless validation path without Geth StateTransition.StatelessChecks(), preserving pending-nonce mempool behavior, so the empty auth-list invariant was missed before mempool admission. DeliverTx invokes the Geth stateless check and rejects the same tx with ErrEmptyAuthList, wrapped as ErrWrongSequence.

Tests

go test ./x/evm/types ./x/evm/types/ethtx ./app/ante ./giga/deps/xevm/types/ethtx

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 17, 2026, 9:25 AM

[cursor]

PR Summary

Low Risk
Tightens tx validation only; invalid SetCode txs are rejected earlier with no change to execution paths for valid transactions.

Overview
SetCode (EIP-7702) transactions with nil or empty AuthList are now rejected during Sei EVM semantic validation, with error auth list cannot be empty. The guard is added at the start of validateAuthList in both x/evm/types/ethtx and the mirrored giga/deps/xevm/types/ethtx copy, so SetCodeTx.Validate() (and thus EvmStatelessChecks on CheckTx) matches Geth’s expectation instead of admitting txs that DeliverTx later fails.

Tests cover SetCodeTx.Validate for nil/empty vs valid lists, EvmStatelessChecks for empty auth list, and a broader SetCodeTx behavior test using a non-empty auth list.

^{Reviewed by Cursor Bugbot for commit 33f7713. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.14%. Comparing base (368f6be) to head (33f7713).

Files with missing lines	Patch %	Lines
giga/deps/xevm/types/ethtx/semantic_validation.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3528      +/-   ##
==========================================
- Coverage   58.97%   58.14%   -0.83%     
==========================================
  Files        2211     2137      -74     
  Lines      182172   173629    -8543     
==========================================
- Hits       107434   100964    -6470     
+ Misses      65120    63720    -1400     
+ Partials     9618     8945     -673     

Flag	Coverage Δ
sei-chain-pr	62.57% <50.00%> (?)
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
x/evm/types/ethtx/semantic_validation.go	42.22% <100.00%> (+9.66%)	⬆️
giga/deps/xevm/types/ethtx/semantic_validation.go	31.11% <0.00%> (-1.45%)	⬇️

... and 76 files with indirect coverage changes

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