Merge pull request #832 from aave/feat/3.0.2

3.0.2 Upgrade

.github/workflows/certora.yml

@@ -31,7 +31,7 @@ jobs:
         with: { java-version: '11', java-package: jre }
 
       - name: Install certora cli
-        run: pip install certora-cli
+        run: pip install certora-cli==3.6.8.post3
 
       - name: Install solc
         run: |

certora/scripts/verifyAToken.sh

@@ -4,5 +4,5 @@ certoraRun certora/harness/SimpleERC20.sol \
     --link ATokenHarness:_underlyingAsset=SimpleERC20 \
     --optimistic_loop \
     --solc solc8.10 \
-    --cloud master \
+    --cloud \
     --msg "aToken spec - all rules" 

certora/scripts/verifyPool.sh

@@ -8,6 +8,6 @@ certoraRun certora/harness/PoolHarness.sol \
   --settings -mediumTimeout=700,-depth=40 \
   --optimistic_loop \
   --solc solc8.10 \
-  --cloud master \
+  --cloud \
   --rules $1 \
   --msg "Pool"

certora/scripts/verifyReserveConfiguration.sh

@@ -3,5 +3,5 @@ certoraRun certora/harness/ReserveConfigurationHarness.sol \
     --settings -useBitVectorTheory \
     --optimistic_loop \
     --solc solc8.10 \
-    --cloud master \
+    --cloud \
     --msg "ReserveConfiguration"

certora/scripts/verifyStableTokenCLI.sh

@@ -3,5 +3,5 @@ certoraRun certora/harness/StableDebtTokenHarness.sol:StableDebtTokenHarness \
     --settings -assumeUnwindCond,-b=4 \
     --cache StableToken \
     --solc solc8.10 \
-    --cloud master \
+    --cloud \
     --msg "stableTokenCLI"

certora/scripts/verifyUserConfigCLI.sh

@@ -3,5 +3,5 @@ certoraRun certora/harness/UserConfigurationHarness.sol \
     --settings -useBitVectorTheory \
     --optimistic_loop \
     --solc solc8.10 \
-    --cloud master \
+    --cloud \
     --msg "UserConfiguration All spec" 

certora/scripts/verifyVariableTokenCLI.sh

@@ -2,5 +2,5 @@ certoraRun certora/harness/VariableDebtTokenHarness.sol \
     --verify VariableDebtTokenHarness:certora/specs/VariableDebtToken.spec \
     --optimistic_loop \
     --solc solc8.10 \
-    --cloud master \
+    --cloud \
     --msg "variable debt token" 

contracts/interfaces/IL2Pool.sol

@@ -39,8 +39,9 @@ interface IL2Pool {
    * @dev the shortenedAmount is cast to 256 bits at decode time, if type(uint128).max the value will be expanded to
    * type(uint256).max
    * @dev assetId is the index of the asset in the reservesList.
+   * @return The final amount withdrawn
    */
-  function withdraw(bytes32 args) external;
+  function withdraw(bytes32 args) external returns (uint256);
 
   /**
    * @notice Calldata efficient wrapper of the borrow function, borrowing on behalf of the caller

contracts/misc/ZeroReserveInterestRateStrategy.sol

@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.0;
+
+import {DataTypes} from '../protocol/libraries/types/DataTypes.sol';
+import {IDefaultInterestRateStrategy} from '../interfaces/IDefaultInterestRateStrategy.sol';
+import {IReserveInterestRateStrategy} from '../interfaces/IReserveInterestRateStrategy.sol';
+import {IPoolAddressesProvider} from '../interfaces/IPoolAddressesProvider.sol';
+
+/**
+ * @title ZeroReserveInterestRateStrategy contract
+ * @author Aave
+ * @notice Interest Rate Strategy contract, with all parameters zeroed.
+ * @dev It returns zero liquidity and borrow rate.
+ */
+contract ZeroReserveInterestRateStrategy is IDefaultInterestRateStrategy {
+  /// @inheritdoc IDefaultInterestRateStrategy
+  uint256 public constant OPTIMAL_USAGE_RATIO = 0;
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  uint256 public constant OPTIMAL_STABLE_TO_TOTAL_DEBT_RATIO = 0;
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  uint256 public constant MAX_EXCESS_USAGE_RATIO = 0;
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  uint256 public constant MAX_EXCESS_STABLE_TO_TOTAL_DEBT_RATIO = 0;
+
+  IPoolAddressesProvider public immutable ADDRESSES_PROVIDER;
+
+  // Base variable borrow rate when usage rate = 0. Expressed in ray
+  uint256 internal constant _baseVariableBorrowRate = 0;
+
+  // Slope of the variable interest curve when usage ratio > 0 and <= OPTIMAL_USAGE_RATIO. Expressed in ray
+  uint256 internal constant _variableRateSlope1 = 0;
+
+  // Slope of the variable interest curve when usage ratio > OPTIMAL_USAGE_RATIO. Expressed in ray
+  uint256 internal constant _variableRateSlope2 = 0;
+
+  // Slope of the stable interest curve when usage ratio > 0 and <= OPTIMAL_USAGE_RATIO. Expressed in ray
+  uint256 internal constant _stableRateSlope1 = 0;
+
+  // Slope of the stable interest curve when usage ratio > OPTIMAL_USAGE_RATIO. Expressed in ray
+  uint256 internal constant _stableRateSlope2 = 0;
+
+  // Premium on top of `_variableRateSlope1` for base stable borrowing rate
+  uint256 internal constant _baseStableRateOffset = 0;
+
+  // Additional premium applied to stable rate when stable debt surpass `OPTIMAL_STABLE_TO_TOTAL_DEBT_RATIO`
+  uint256 internal constant _stableRateExcessOffset = 0;
+
+  /**
+   * @dev Constructor.
+   * @param provider The address of the PoolAddressesProvider contract
+   */
+  constructor(IPoolAddressesProvider provider) {
+    ADDRESSES_PROVIDER = provider;
+  }
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  function getVariableRateSlope1() external pure returns (uint256) {
+    return _variableRateSlope1;
+  }
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  function getVariableRateSlope2() external pure returns (uint256) {
+    return _variableRateSlope2;
+  }
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  function getStableRateSlope1() external pure returns (uint256) {
+    return _stableRateSlope1;
+  }
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  function getStableRateSlope2() external pure returns (uint256) {
+    return _stableRateSlope2;
+  }
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  function getStableRateExcessOffset() external pure returns (uint256) {
+    return _stableRateExcessOffset;
+  }
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  function getBaseStableBorrowRate() public pure returns (uint256) {
+    return _variableRateSlope1 + _baseStableRateOffset;
+  }
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  function getBaseVariableBorrowRate() external pure override returns (uint256) {
+    return _baseVariableBorrowRate;
+  }
+
+  /// @inheritdoc IDefaultInterestRateStrategy
+  function getMaxVariableBorrowRate() external pure override returns (uint256) {
+    return _baseVariableBorrowRate + _variableRateSlope1 + _variableRateSlope2;
+  }
+
+  /// @inheritdoc IReserveInterestRateStrategy
+  function calculateInterestRates(
+    DataTypes.CalculateInterestRatesParams memory
+  ) public pure override returns (uint256, uint256, uint256) {
+    return (0, 0, 0);
+  }
+}

contracts/protocol/libraries/helpers/Errors.sol

@@ -67,7 +67,7 @@ library Errors {
   string public constant PRICE_ORACLE_SENTINEL_CHECK_FAILED = '59'; // 'Price oracle sentinel validation failed'
   string public constant ASSET_NOT_BORROWABLE_IN_ISOLATION = '60'; // 'Asset is not borrowable in isolation mode'
   string public constant RESERVE_ALREADY_INITIALIZED = '61'; // 'Reserve has already been initialized'
-  string public constant USER_IN_ISOLATION_MODE = '62'; // 'User is in isolation mode'
+  string public constant USER_IN_ISOLATION_MODE_OR_LTV_ZERO = '62'; // 'User is in isolation mode or ltv is zero'
   string public constant INVALID_LTV = '63'; // 'Invalid ltv parameter for the reserve'
   string public constant INVALID_LIQ_THRESHOLD = '64'; // 'Invalid liquidity threshold parameter for the reserve'
   string public constant INVALID_LIQ_BONUS = '65'; // 'Invalid liquidity bonus parameter for the reserve'

contracts/protocol/libraries/logic/BridgeLogic.sol

@@ -86,11 +86,12 @@ library BridgeLogic {
 
     if (isFirstSupply) {
       if (
-        ValidationLogic.validateUseAsCollateral(
+        ValidationLogic.validateAutomaticUseAsCollateral(
           reservesData,
           reservesList,
           userConfig,
-          reserveCache.reserveConfiguration
+          reserveCache.reserveConfiguration,
+          reserveCache.aTokenAddress
         )
       ) {
         userConfig.setUsingAsCollateral(reserve.id, true);

contracts/protocol/libraries/logic/FlashLoanLogic.sol

@@ -91,7 +91,10 @@ library FlashLoanLogic {
 
     for (vars.i = 0; vars.i < params.assets.length; vars.i++) {
       vars.currentAmount = params.amounts[vars.i];
-      vars.totalPremiums[vars.i] = vars.currentAmount.percentMul(vars.flashloanPremiumTotal);
+      vars.totalPremiums[vars.i] = DataTypes.InterestRateMode(params.interestRateModes[vars.i]) ==
+        DataTypes.InterestRateMode.NONE
+        ? vars.currentAmount.percentMul(vars.flashloanPremiumTotal)
+        : 0;
       IAToken(reservesData[params.assets[vars.i]].aTokenAddress).transferUnderlyingTo(
         params.receiverAddress,
         vars.currentAmount

contracts/protocol/libraries/logic/LiquidationLogic.sol

@@ -300,11 +300,12 @@ library LiquidationLogic {
     if (liquidatorPreviousATokenBalance == 0) {
       DataTypes.UserConfigurationMap storage liquidatorConfig = usersConfig[msg.sender];
       if (
-        ValidationLogic.validateUseAsCollateral(
+        ValidationLogic.validateAutomaticUseAsCollateral(
           reservesData,
           reservesList,
           liquidatorConfig,
-          collateralReserve.configuration
+          collateralReserve.configuration,
+          collateralReserve.aTokenAddress
         )
       ) {
         liquidatorConfig.setUsingAsCollateral(collateralReserve.id, true);

contracts/protocol/libraries/logic/SupplyLogic.sol

@@ -75,11 +75,12 @@ library SupplyLogic {
 
     if (isFirstSupply) {
       if (
-        ValidationLogic.validateUseAsCollateral(
+        ValidationLogic.validateAutomaticUseAsCollateral(
           reservesData,
           reservesList,
           userConfig,
-          reserveCache.reserveConfiguration
+          reserveCache.reserveConfiguration,
+          reserveCache.aTokenAddress
         )
       ) {
         userConfig.setUsingAsCollateral(reserve.id, true);
@@ -212,11 +213,12 @@ library SupplyLogic {
       if (params.balanceToBefore == 0) {
         DataTypes.UserConfigurationMap storage toConfig = usersConfig[params.to];
         if (
-          ValidationLogic.validateUseAsCollateral(
+          ValidationLogic.validateAutomaticUseAsCollateral(
             reservesData,
             reservesList,
             toConfig,
-            reserve.configuration
+            reserve.configuration,
+            reserve.aTokenAddress
           )
         ) {
           toConfig.setUsingAsCollateral(reserveId, true);
@@ -270,7 +272,7 @@ library SupplyLogic {
           userConfig,
           reserveCache.reserveConfiguration
         ),
-        Errors.USER_IN_ISOLATION_MODE
+        Errors.USER_IN_ISOLATION_MODE_OR_LTV_ZERO
       );
 
       userConfig.setUsingAsCollateral(reserve.id, true);

contracts/protocol/libraries/logic/ValidationLogic.sol

@@ -10,6 +10,8 @@ import {IScaledBalanceToken} from '../../../interfaces/IScaledBalanceToken.sol';
 import {IPriceOracleGetter} from '../../../interfaces/IPriceOracleGetter.sol';
 import {IAToken} from '../../../interfaces/IAToken.sol';
 import {IPriceOracleSentinel} from '../../../interfaces/IPriceOracleSentinel.sol';
+import {IPoolAddressesProvider} from '../../../interfaces/IPoolAddressesProvider.sol';
+import {IAccessControl} from '../../../dependencies/openzeppelin/contracts/IAccessControl.sol';
 import {ReserveConfiguration} from '../configuration/ReserveConfiguration.sol';
 import {UserConfiguration} from '../configuration/UserConfiguration.sol';
 import {Errors} from '../helpers/Errors.sol';
@@ -19,6 +21,7 @@ import {DataTypes} from '../types/DataTypes.sol';
 import {ReserveLogic} from './ReserveLogic.sol';
 import {GenericLogic} from './GenericLogic.sol';
 import {SafeCast} from '../../../dependencies/openzeppelin/contracts/SafeCast.sol';
+import {IncentivizedERC20} from '../../tokenization/base/IncentivizedERC20.sol';
 
 /**
  * @title ReserveLogic library
@@ -49,6 +52,12 @@ library ValidationLogic {
    */
   uint256 public constant HEALTH_FACTOR_LIQUIDATION_THRESHOLD = 1e18;
 
+  /**
+   * @dev Role identifier for the role allowed to supply isolated reserves as collateral
+   */
+  bytes32 public constant ISOLATED_COLLATERAL_SUPPLIER_ROLE =
+    keccak256('ISOLATED_COLLATERAL_SUPPLIER');
+
   /**
    * @notice Validates a supply action.
    * @param reserveCache The cached data of the reserve
@@ -664,7 +673,7 @@ library ValidationLogic {
       Errors.INCONSISTENT_EMODE_CATEGORY
     );
 
-    //eMode can always be enabled if the user hasn't supplied anything
+    // eMode can always be enabled if the user hasn't supplied anything
     if (userConfig.isEmpty()) {
       return;
     }
@@ -688,10 +697,8 @@ library ValidationLogic {
   }
 
   /**
-   * @notice Validates if an asset can be activated as collateral in the following actions: supply, transfer,
-   * set as collateral, mint unbacked, and liquidate
-   * @dev This is used to ensure that the constraints for isolated assets are respected by all the actions that
-   * generate transfers of aTokens
+   * @notice Validates the action of activating the asset as collateral.
+   * @dev Only possible if the asset has non-zero LTV and the user is not in isolation mode
    * @param reservesData The state of all the reserves
    * @param reservesList The addresses of all the active reserves
    * @param userConfig the user configuration
@@ -704,11 +711,46 @@ library ValidationLogic {
     DataTypes.UserConfigurationMap storage userConfig,
     DataTypes.ReserveConfigurationMap memory reserveConfig
   ) internal view returns (bool) {
+    if (reserveConfig.getLtv() == 0) {
+      return false;
+    }
     if (!userConfig.isUsingAsCollateralAny()) {
       return true;
     }
     (bool isolationModeActive, , ) = userConfig.getIsolationModeState(reservesData, reservesList);
 
     return (!isolationModeActive && reserveConfig.getDebtCeiling() == 0);
   }
+
+  /**
+   * @notice Validates if an asset should be automatically activated as collateral in the following actions: supply,
+   * transfer, mint unbacked, and liquidate
+   * @dev This is used to ensure that isolated assets are not enabled as collateral automatically
+   * @param reservesData The state of all the reserves
+   * @param reservesList The addresses of all the active reserves
+   * @param userConfig the user configuration
+   * @param reserveConfig The reserve configuration
+   * @return True if the asset can be activated as collateral, false otherwise
+   */
+  function validateAutomaticUseAsCollateral(
+    mapping(address => DataTypes.ReserveData) storage reservesData,
+    mapping(uint256 => address) storage reservesList,
+    DataTypes.UserConfigurationMap storage userConfig,
+    DataTypes.ReserveConfigurationMap memory reserveConfig,
+    address aTokenAddress
+  ) internal view returns (bool) {
+    if (reserveConfig.getDebtCeiling() != 0) {
+      // ensures only the ISOLATED_COLLATERAL_SUPPLIER_ROLE can enable collateral as side-effect of an action
+      IPoolAddressesProvider addressesProvider = IncentivizedERC20(aTokenAddress)
+        .POOL()
+        .ADDRESSES_PROVIDER();
+      if (
+        !IAccessControl(addressesProvider.getACLManager()).hasRole(
+          ISOLATED_COLLATERAL_SUPPLIER_ROLE,
+          msg.sender
+        )
+      ) return false;
+    }
+    return validateUseAsCollateral(reservesData, reservesList, userConfig, reserveConfig);
+  }
 }

contracts/protocol/libraries/types/DataTypes.sol

@@ -78,11 +78,7 @@ library DataTypes {
     string label;
   }
 
-  enum InterestRateMode {
-    NONE,
-    STABLE,
-    VARIABLE
-  }
+  enum InterestRateMode {NONE, STABLE, VARIABLE}
 
   struct ReserveCache {
     uint256 currScaledVariableDebt;

contracts/protocol/pool/L2Pool.sol

@@ -40,10 +40,10 @@ contract L2Pool is Pool, IL2Pool {
   }
 
   /// @inheritdoc IL2Pool
-  function withdraw(bytes32 args) external override {
+  function withdraw(bytes32 args) external override returns (uint256) {
     (address asset, uint256 amount) = CalldataLogic.decodeWithdrawParams(_reservesList, args);
 
-    withdraw(asset, amount, msg.sender);
+    return withdraw(asset, amount, msg.sender);
   }
 
   /// @inheritdoc IL2Pool

helpers/types.ts

@@ -131,7 +131,7 @@ export enum ProtocolErrors {
   PRICE_ORACLE_SENTINEL_CHECK_FAILED = '59', // 'Price oracle sentinel validation failed'
   ASSET_NOT_BORROWABLE_IN_ISOLATION = '60', // 'Asset is not borrowable in isolation mode'
   RESERVE_ALREADY_INITIALIZED = '61', // 'Reserve has already been initialized'
-  USER_IN_ISOLATION_MODE = '62', // 'User is in isolation mode'
+  USER_IN_ISOLATION_MODE_OR_LTV_ZERO = '62', // 'User is in isolation mode or ltv is zero'
   INVALID_LTV = '63', // 'Invalid ltv parameter for the reserve'
   INVALID_LIQ_THRESHOLD = '64', // 'Invalid liquidity threshold parameter for the reserve'
   INVALID_LIQ_BONUS = '65', // 'Invalid liquidity bonus parameter for the reserve'