CCIP-4476 remove legacy curse check in rmnRemote

contracts/.changeset/eighty-cycles-film.md

@@ -0,0 +1,10 @@
+---
+'@chainlink/contracts': patch
+---
+
+remove legacy curse check from RMNRemote isCursed() method #bugfix
+
+
+PR issue: CCIP-4476
+
+Solidity Review issue: CCIP-3966

contracts/gas-snapshots/ccip.gas-snapshot

@@ -572,7 +572,7 @@ RMNRemote_constructor:test_constructor() (gas: 8398)
 RMNRemote_curse:test_curse_AlreadyCursed_duplicateSubject_reverts() (gas: 154501)
 RMNRemote_curse:test_curse_calledByNonOwner_reverts() (gas: 18734)
 RMNRemote_curse:test_curse_success() (gas: 149475)
-RMNRemote_global_and_legacy_curses:test_global_and_legacy_curses_success() (gas: 133441)
+RMNRemote_global_curses:test_isCursed_globalCurseSubject() (gas: 71715)
 RMNRemote_isBlessed:test_isBlessed() (gas: 17588)
 RMNRemote_setConfig:test_setConfig_ZeroValueNotAllowed_revert() (gas: 37971)
 RMNRemote_setConfig:test_setConfig_addSigner_removeSigner_success() (gas: 993448)

contracts/src/v0.8/ccip/rmn/RMNRemote.sol

@@ -9,11 +9,6 @@ import {Ownable2StepMsgSender} from "../../shared/access/Ownable2StepMsgSender.s
 import {EnumerableSet} from "../../shared/enumerable/EnumerableSetWithBytes16.sol";
 import {Internal} from "../libraries/Internal.sol";
 
-/// @dev An active curse on this subject will cause isCursed() to return true. Use this subject if there is an issue
-/// with a remote chain, for which there exists a legacy lane contract deployed on the same chain as this RMN contract
-/// is deployed, relying on isCursed().
-bytes16 constant LEGACY_CURSE_SUBJECT = 0x01000000000000000000000000000000;
-
 /// @dev An active curse on this subject will cause isCursed() and isCursed(bytes16) to return true. Use this subject
 /// for issues affecting all of CCIP chains, or pertaining to the chain that this contract is deployed on, instead of
 /// using the local chain selector as a subject.
@@ -256,11 +251,11 @@ contract RMNRemote is Ownable2StepMsgSender, ITypeAndVersion, IRMNRemote, IRMN {
   /// @inheritdoc IRMNRemote
   function isCursed() external view override(IRMN, IRMNRemote) returns (bool) {
     // There are zero curses under normal circumstances, which means it's cheaper to check for the absence of curses.
-    // than to check the subject list twice, as we have to check for both the legacy and global curse subjects.
+    // than to check the subject list for the global curse subject.
     if (s_cursedSubjects.length() == 0) {
       return false;
     }
-    return s_cursedSubjects.contains(LEGACY_CURSE_SUBJECT) || s_cursedSubjects.contains(GLOBAL_CURSE_SUBJECT);
+    return s_cursedSubjects.contains(GLOBAL_CURSE_SUBJECT);
   }
 
   /// @inheritdoc IRMNRemote

contracts/src/v0.8/ccip/test/rmn/RMNRemote/RMNRemote.globalAndLegacyCurses.t.sol → contracts/src/v0.8/ccip/test/rmn/RMNRemote/RMNRemote.globalCurses.t.sol

@@ -1,11 +1,11 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity 0.8.24;
 
-import {GLOBAL_CURSE_SUBJECT, LEGACY_CURSE_SUBJECT} from "../../../rmn/RMNRemote.sol";
+import {GLOBAL_CURSE_SUBJECT} from "../../../rmn/RMNRemote.sol";
 import {RMNRemoteSetup} from "./RMNRemoteSetup.t.sol";
 
-contract RMNRemote_global_and_legacy_curses is RMNRemoteSetup {
-  function test_global_and_legacy_curses_success() public {
+contract RMNRemote_global_curses is RMNRemoteSetup {
+  function test_isCursed_globalCurseSubject() public {
     bytes16 randSubject = bytes16(keccak256("random subject"));
     assertFalse(s_rmnRemote.isCursed());
     assertFalse(s_rmnRemote.isCursed(randSubject));
@@ -17,13 +17,5 @@ contract RMNRemote_global_and_legacy_curses is RMNRemoteSetup {
     s_rmnRemote.uncurse(GLOBAL_CURSE_SUBJECT);
     assertFalse(s_rmnRemote.isCursed());
     assertFalse(s_rmnRemote.isCursed(randSubject));
-
-    s_rmnRemote.curse(LEGACY_CURSE_SUBJECT);
-    assertTrue(s_rmnRemote.isCursed());
-    assertFalse(s_rmnRemote.isCursed(randSubject)); // legacy curse doesn't affect specific subjects
-
-    s_rmnRemote.uncurse(LEGACY_CURSE_SUBJECT);
-    assertFalse(s_rmnRemote.isCursed());
-    assertFalse(s_rmnRemote.isCursed(randSubject));
   }
 }

core/gethwrappers/ccip/generation/generated-wrapper-dependency-versions-do-not-edit.txt

@@ -23,7 +23,7 @@ registry_module_owner_custom: ../../../contracts/solc/v0.8.24/RegistryModuleOwne
 report_codec: ../../../contracts/solc/v0.8.24/ReportCodec/ReportCodec.abi ../../../contracts/solc/v0.8.24/ReportCodec/ReportCodec.bin 6c943b39f003aa67c3cefa19a8ff99e846236a058e1ceae77569c3a065ffd5c7
 rmn_home: ../../../contracts/solc/v0.8.24/RMNHome/RMNHome.abi ../../../contracts/solc/v0.8.24/RMNHome/RMNHome.bin 84ca84b3d0c00949905a3d10a91255f877cf32b2a0d7f7f7ce3121ced34a8cb7
 rmn_proxy_contract: ../../../contracts/solc/v0.8.24/ARMProxy/ARMProxy.abi ../../../contracts/solc/v0.8.24/ARMProxy/ARMProxy.bin b048d8e752e3c41113ebb305c1efa06737ad36b4907b93e627fb0a3113023454
-rmn_remote: ../../../contracts/solc/v0.8.24/RMNRemote/RMNRemote.abi ../../../contracts/solc/v0.8.24/RMNRemote/RMNRemote.bin 941118dfdc6bb042c339cfe8d8e0c7a0b486afb731a785d58a64994e7a13c459
+rmn_remote: ../../../contracts/solc/v0.8.24/RMNRemote/RMNRemote.abi ../../../contracts/solc/v0.8.24/RMNRemote/RMNRemote.bin 2bf58225d1ceec21f3dd9e65b8088945c643ec527ae54b9983ec46316f5bca1f
 router: ../../../contracts/solc/v0.8.24/Router/Router.abi ../../../contracts/solc/v0.8.24/Router/Router.bin 2e4f0a7826c8abb49d882bb49fc5ff20a186dbd3137624b9097ffed903ae4888
 token_admin_registry: ../../../contracts/solc/v0.8.24/TokenAdminRegistry/TokenAdminRegistry.abi ../../../contracts/solc/v0.8.24/TokenAdminRegistry/TokenAdminRegistry.bin 397bc7be08c2848c0f4715f90b16206d6367f78ffb7cd48e2b1dfc0ccc5aea26
 token_pool: ../../../contracts/solc/v0.8.24/TokenPool/TokenPool.abi ../../../contracts/solc/v0.8.24/TokenPool/TokenPool.bin 793d65f336929becdcf8bc3f2208a5b6de93774215fe2e863bef64df419cfdb0