From 52188a21272c9863443ad33a4cd30d4871371642 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Tue, 24 Aug 2021 16:09:25 -0300
Subject: [PATCH 01/24] Add changelog entry for 3.4.1

---
 CHANGELOG.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53b3d458026..23079afa48c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -95,6 +95,10 @@ Make sure you're using git or another version control system to be able to recov
 
 Some further changes have been done between the different beta iterations. Transitions made during this period are configured in the `migrate-imports` script. Consequently, you can upgrade from any previous 4.0-beta.x version using the same script as described in the *How to upgrade from 3.x* section.
 
+## 3.4.1 (2021-03-03)
+
+ * `ERC721`: made `_approve` an internal function (was private).
+
 ## 3.4.0 (2021-02-02)
 
  * `BeaconProxy`: added new kind of proxy that allows simultaneous atomic upgrades. ([#2411](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2411))

From cec4f2ef57495d8b1742d62846da212515d99dd5 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Tue, 24 Aug 2021 16:09:39 -0300
Subject: [PATCH 02/24] Add additional isOperationReady check in
 TimelockController

---
 CHANGELOG.md                                | 8 ++++++++
 contracts/governance/TimelockController.sol | 7 ++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 23079afa48c..99972ed62f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 4.3.1
+
+ * `TimelockController`: Add additional isOperationReady check.
+
 ## 4.3.0 (2021-08-17)
 
  * `ERC2771Context`: use private variable from storage to store the forwarder address. Fixes issues where `_msgSender()` was not callable from constructors. ([#2754](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2754))
@@ -95,6 +99,10 @@ Make sure you're using git or another version control system to be able to recov
 
 Some further changes have been done between the different beta iterations. Transitions made during this period are configured in the `migrate-imports` script. Consequently, you can upgrade from any previous 4.0-beta.x version using the same script as described in the *How to upgrade from 3.x* section.
 
+## 3.4.2
+
+ * `TimelockController`: Add additional isOperationReady check.
+
 ## 3.4.1 (2021-03-03)
 
  * `ERC721`: made `_approve` an internal function (was private).
diff --git a/contracts/governance/TimelockController.sol b/contracts/governance/TimelockController.sol
index 10aeb4ee490..e52cb0d3f5a 100644
--- a/contracts/governance/TimelockController.sol
+++ b/contracts/governance/TimelockController.sol
@@ -268,7 +268,7 @@ contract TimelockController is AccessControl {
         bytes32 salt
     ) public payable virtual onlyRoleOrOpenRole(EXECUTOR_ROLE) {
         bytes32 id = hashOperation(target, value, data, predecessor, salt);
-        _beforeCall(predecessor);
+        _beforeCall(id, predecessor);
         _call(id, 0, target, value, data);
         _afterCall(id);
     }
@@ -293,7 +293,7 @@ contract TimelockController is AccessControl {
         require(targets.length == datas.length, "TimelockController: length mismatch");
 
         bytes32 id = hashOperationBatch(targets, values, datas, predecessor, salt);
-        _beforeCall(predecessor);
+        _beforeCall(id, predecessor);
         for (uint256 i = 0; i < targets.length; ++i) {
             _call(id, i, targets[i], values[i], datas[i]);
         }
@@ -303,7 +303,8 @@ contract TimelockController is AccessControl {
     /**
      * @dev Checks before execution of an operation's calls.
      */
-    function _beforeCall(bytes32 predecessor) private view {
+    function _beforeCall(bytes32 id, bytes32 predecessor) private view {
+        require(isOperationReady(id), "TimelockController: operation is not ready");
         require(predecessor == bytes32(0) || isOperationDone(predecessor), "TimelockController: missing dependency");
     }
 

From 0ec7f4c25d60437e0ae5bb72cb4549a58e53a387 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Tue, 24 Aug 2021 16:09:39 -0300
Subject: [PATCH 03/24] Add additional isOperationReady check in
 TimelockController

(cherry picked from commit cec4f2ef57495d8b1742d62846da212515d99dd5)
---
 CHANGELOG.md                                | 4 ++++
 contracts/governance/TimelockController.sol | 7 ++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53b3d458026..7407e25ac0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 4.3.1
+
+ * `TimelockController`: Add additional isOperationReady check.
+
 ## 4.3.0 (2021-08-17)
 
  * `ERC2771Context`: use private variable from storage to store the forwarder address. Fixes issues where `_msgSender()` was not callable from constructors. ([#2754](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2754))
diff --git a/contracts/governance/TimelockController.sol b/contracts/governance/TimelockController.sol
index 10aeb4ee490..e52cb0d3f5a 100644
--- a/contracts/governance/TimelockController.sol
+++ b/contracts/governance/TimelockController.sol
@@ -268,7 +268,7 @@ contract TimelockController is AccessControl {
         bytes32 salt
     ) public payable virtual onlyRoleOrOpenRole(EXECUTOR_ROLE) {
         bytes32 id = hashOperation(target, value, data, predecessor, salt);
-        _beforeCall(predecessor);
+        _beforeCall(id, predecessor);
         _call(id, 0, target, value, data);
         _afterCall(id);
     }
@@ -293,7 +293,7 @@ contract TimelockController is AccessControl {
         require(targets.length == datas.length, "TimelockController: length mismatch");
 
         bytes32 id = hashOperationBatch(targets, values, datas, predecessor, salt);
-        _beforeCall(predecessor);
+        _beforeCall(id, predecessor);
         for (uint256 i = 0; i < targets.length; ++i) {
             _call(id, i, targets[i], values[i], datas[i]);
         }
@@ -303,7 +303,8 @@ contract TimelockController is AccessControl {
     /**
      * @dev Checks before execution of an operation's calls.
      */
-    function _beforeCall(bytes32 predecessor) private view {
+    function _beforeCall(bytes32 id, bytes32 predecessor) private view {
+        require(isOperationReady(id), "TimelockController: operation is not ready");
         require(predecessor == bytes32(0) || isOperationDone(predecessor), "TimelockController: missing dependency");
     }
 

From 6edb6dd1ca43d05a762d84c688116b3327f5e490 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Thu, 26 Aug 2021 17:59:03 -0300
Subject: [PATCH 04/24] 4.3.1

---
 CHANGELOG.md           | 2 +-
 contracts/package.json | 2 +-
 package-lock.json      | 4 ++--
 package.json           | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7407e25ac0c..a6976a94dc7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 4.3.1
+## 4.3.1 (2021-08-26)
 
  * `TimelockController`: Add additional isOperationReady check.
 
diff --git a/contracts/package.json b/contracts/package.json
index 1a4cbba9f6c..654d0f82080 100644
--- a/contracts/package.json
+++ b/contracts/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@openzeppelin/contracts",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "4.3.0",
+  "version": "4.3.1",
   "files": [
     "**/*.sol",
     "/build/contracts/*.json",
diff --git a/package-lock.json b/package-lock.json
index b378116d93c..c267c0a60ba 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "openzeppelin-solidity",
-  "version": "4.3.0",
+  "version": "4.3.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "openzeppelin-solidity",
-      "version": "4.3.0-rc.0",
+      "version": "4.3.1",
       "license": "MIT",
       "bin": {
         "openzeppelin-contracts-migrate-imports": "scripts/migrate-imports.js"
diff --git a/package.json b/package.json
index 8cd7c1b0927..b23f0a1c743 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "openzeppelin-solidity",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "4.3.0",
+  "version": "4.3.1",
   "files": [
     "/contracts/**/*.sol",
     "/build/contracts/*.json",

From 9b4326d91eb7230562f4c3c4eb77909156adc7ee Mon Sep 17 00:00:00 2001
From: Hasan Raza <49759922+hasanza@users.noreply.github.com>
Date: Mon, 30 Aug 2021 18:20:35 +0500
Subject: [PATCH 05/24] Fixed a typo (#2835)

---
 contracts/security/ReentrancyGuard.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contracts/security/ReentrancyGuard.sol b/contracts/security/ReentrancyGuard.sol
index 067a2c94ee0..0ceb97dfd8a 100644
--- a/contracts/security/ReentrancyGuard.sol
+++ b/contracts/security/ReentrancyGuard.sol
@@ -43,7 +43,7 @@ abstract contract ReentrancyGuard {
      * @dev Prevents a contract from calling itself, directly or indirectly.
      * Calling a `nonReentrant` function from another `nonReentrant`
      * function is not supported. It is possible to prevent this from happening
-     * by making the `nonReentrant` function external, and make it call a
+     * by making the `nonReentrant` function external, and making it call a
      * `private` function that does the actual work.
      */
     modifier nonReentrant() {

From fb36326a58f1bf05896014d540ba7190886e5673 Mon Sep 17 00:00:00 2001
From: Hadrien Croubois <hadrien.croubois@gmail.com>
Date: Mon, 30 Aug 2021 21:42:22 +0200
Subject: [PATCH 06/24] Support london with coverage using initialBaseFee = 0
 (#2838)

---
 hardhat.config.js | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/hardhat.config.js b/hardhat.config.js
index a5640e9e5dd..aaa1ca03606 100644
--- a/hardhat.config.js
+++ b/hardhat.config.js
@@ -1,7 +1,10 @@
 /// ENVVAR
-// - ENABLE_GAS_REPORT
-// - CI
-// - COMPILE_MODE
+// - CI:                output gas report to file instead of stdout
+// - COVERAGE:          enable coverage report
+// - ENABLE_GAS_REPORT: enable gas report
+// - COMPILE_MODE:      production modes enables optimizations (default: development)
+// - COMPILE_VERSION:   compiler version (default: 0.8.3)
+// - COINMARKETCAP:     coinmarkercat api key for USD value in gas report
 
 const fs = require('fs');
 const path = require('path');
@@ -12,6 +15,10 @@ const argv = require('yargs/yargs')()
       type: 'boolean',
       default: false,
     },
+    coverage: {
+      type: 'boolean',
+      default: false,
+    },
     gas: {
       alias: 'enableGasReport',
       type: 'boolean',
@@ -28,11 +35,14 @@ const argv = require('yargs/yargs')()
       type: 'string',
       default: '0.8.3',
     },
+    coinmarketcap: {
+      alias: 'coinmarketcapApiKey',
+      type: 'string',
+    },
   })
   .argv;
 
 require('@nomiclabs/hardhat-truffle5');
-require('solidity-coverage');
 
 if (argv.enableGasReport) {
   require('hardhat-gas-reporter');
@@ -59,7 +69,6 @@ module.exports = {
   },
   networks: {
     hardhat: {
-      hardfork: process.env.COVERAGE ? 'berlin' : 'london',
       blockGasLimit: 10000000,
       allowUnlimitedContractSize: !withOptimizations,
     },
@@ -67,5 +76,11 @@ module.exports = {
   gasReporter: {
     currency: 'USD',
     outputFile: argv.ci ? 'gas-report.txt' : undefined,
+    coinmarketcap: argv.coinmarketcap,
   },
 };
+
+if (argv.coverage) {
+  require('solidity-coverage');
+  module.exports.networks.hardhat.initialBaseFeePerGas = 0;
+}

From aefcb3e8aa4ee8da8e2b7022ffe4dcb57fbb0fdf Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Wed, 1 Sep 2021 14:28:28 +0200
Subject: [PATCH 07/24] Bump tar from 4.4.17 to 4.4.19 (#2843)

Bumps [tar](https://github.com/npm/node-tar) from 4.4.17 to 4.4.19.
- [Release notes](https://github.com/npm/node-tar/releases)
- [Changelog](https://github.com/npm/node-tar/blob/main/CHANGELOG.md)
- [Commits](https://github.com/npm/node-tar/compare/v4.4.17...v4.4.19)

---
updated-dependencies:
- dependency-name: tar
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
---
 package-lock.json | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 7c1397b58a8..519b8df9d59 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13736,9 +13736,9 @@
       "dev": true
     },
     "tar": {
-      "version": "4.4.17",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.17.tgz",
-      "integrity": "sha512-q7OwXq6NTdcYIa+k58nEMV3j1euhDhGCs/VRw9ymx/PbH0jtIM2+VTgDE/BW3rbLkrBUXs5fzEKgic5oUciu7g==",
+      "version": "4.4.19",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.19.tgz",
+      "integrity": "sha512-a20gEsvHnWe0ygBY8JbxoM4w3SJdhc7ZAuxkLqh+nvNQN2IOt0B5lLgM490X5Hl8FF0dl0tOf2ewFYAlIFgzVA==",
       "dev": true,
       "requires": {
         "chownr": "^1.1.4",

From 8a5b67fb790608cbe770d4233e6c2f70a3cdf8f0 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Mon, 13 Sep 2021 17:43:49 -0300
Subject: [PATCH 08/24] Add notice about location of funds in Governor+Timelock
 setup (#2855)

---
 docs/modules/ROOT/pages/governance.adoc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/modules/ROOT/pages/governance.adoc b/docs/modules/ROOT/pages/governance.adoc
index eb65731fdd5..c8a26f2a8f2 100644
--- a/docs/modules/ROOT/pages/governance.adoc
+++ b/docs/modules/ROOT/pages/governance.adoc
@@ -247,6 +247,8 @@ contract MyGovernor is Governor, GovernorCompatibilityBravo, GovernorVotes, Gove
 
 It is good practice to add a timelock to governance decisions. This allows users to exit the system if they disagree with a decision before it is executed. We will use OpenZeppelin’s TimelockController in combination with the GovernorTimelockControl module.
 
+IMPORTANT: When using a timelock, it is the timelock that will execute proposals and thus the timelock that should hold any funds, ownership, and access control roles. Funds in the Governor contract are not currently retrievable when using a timelock! (As of version 4.3 there is a caveat when using the Compound Timelock: ETH in the timelock is not easily usable, so it is recommended to manage ERC20 funds only in this combination until a future version resolves the issue.)
+
 TimelockController uses an AccessControl setup that we need to understand in order to set up roles. The Proposer role is in charge of queueing operations: this is the role the Governor instance should be granted, and it should likely be the only proposer in the system. The Executor role is in charge of executing already available operations: we can assign this role to the special zero address to allow anyone to execute (if operations can be particularly time sensitive, the Governor should be made Executor instead). Lastly, there is the Admin role, which can grant and revoke the two previous roles: this is a very sensitive role that will be granted automatically to both deployer and timelock itself, but should be renounced by the deployer after setup.
 
 == Proposal Lifecycle

From 38448c104aa5725bb07d35b591156cd59402c929 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Mon, 13 Sep 2021 18:07:29 -0300
Subject: [PATCH 09/24] Add recommendation to initialize all contracts that use
 Initializable

---
 contracts/proxy/utils/Initializable.sol | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/contracts/proxy/utils/Initializable.sol b/contracts/proxy/utils/Initializable.sol
index 7bd696bd891..6e6c906ea51 100644
--- a/contracts/proxy/utils/Initializable.sol
+++ b/contracts/proxy/utils/Initializable.sol
@@ -13,6 +13,22 @@ pragma solidity ^0.8.0;
  *
  * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
  * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
+ *
+ * [CAUTION]
+ * ====
+ * Avoid leaving a contract uninitialized.
+ *
+ * An uninitialized contract can be used in certain kinds of exploits since it may allow an attacker to take control of
+ * the contract. This includes the implementation contract behind a proxy. You can either invoke the initializer
+ * manually, independently of initialization of the proxy, or you can include a constructor to automatically mark it as
+ * initialized when it is deployed:
+ *
+ * [.hljs-theme-light.nopadding]
+ * ```
+ * /// @custom:oz-upgrades-unsafe-allow constructor
+ * constructor() initializer {}
+ * ```
+ * ====
  */
 abstract contract Initializable {
     /**

From 5e34a84d4a5f45fb9a50eeef2aa39f894b9ac7ad Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Mon, 13 Sep 2021 18:32:43 -0300
Subject: [PATCH 10/24] Fix ERC721URIStorage description in docs

---
 docs/modules/ROOT/pages/erc721.adoc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/modules/ROOT/pages/erc721.adoc b/docs/modules/ROOT/pages/erc721.adoc
index ec397b89b36..8d28fad2e6e 100644
--- a/docs/modules/ROOT/pages/erc721.adoc
+++ b/docs/modules/ROOT/pages/erc721.adoc
@@ -40,7 +40,7 @@ contract GameItem is ERC721URIStorage {
 }
 ----
 
-The xref:api:token/ERC721.adoc#ERC721URIStorage[`ERC721URIStorage`] contract is an implementation of ERC721 that includes all standard extensions (xref:api:token/ERC721.adoc#IERC721Metadata[`IERC721Metadata`] and xref:api:token/ERC721.adoc#IERC721Enumerable[`IERC721Enumerable`]). That's where the xref:api:token/ERC721.adoc#ERC721-_setTokenURI-uint256-string-[`_setTokenURI`] method comes from: we use it to store an item's metadata.
+The xref:api:token/ERC721.adoc#ERC721URIStorage[`ERC721URIStorage`] contract is an implementation of ERC721 that includes the metadata standard extensions (xref:api:token/ERC721.adoc#IERC721Metadata[`IERC721Metadata`]) as well as a mechanism for per-token metadata. That's where the xref:api:token/ERC721.adoc#ERC721-_setTokenURI-uint256-string-[`_setTokenURI`] method comes from: we use it to store an item's metadata.
 
 Also note that, unlike ERC20, ERC721 lacks a `decimals` field, since each token is distinct and cannot be partitioned.
 

From 7237b1672e1b20ee92ef778343c18c62a9b3cfa0 Mon Sep 17 00:00:00 2001
From: Hadrien Croubois <hadrien.croubois@gmail.com>
Date: Tue, 14 Sep 2021 09:03:47 +0200
Subject: [PATCH 11/24] Make some private functions internal to allow the
 developpement of "withSignature" functions (like permit) (#2568)

* add internal _setOwner in Ownable

* address issues raised in #2567

* updte changelog entry

* improve changelog and documentation

* rephrasing doc

* add cahngelog improvement lost in merge

* notify deprecation of _setupRole in changelog

* Demote caution to note

* Update CHANGELOG.md

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
---
 CHANGELOG.md                       |  6 ++++++
 contracts/access/AccessControl.sol | 16 ++++++++++++++--
 contracts/access/Ownable.sol       | 12 ++++++++----
 3 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 99972ed62f4..e06138d0f61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+ * `Ownable`: add an internal `_transferOwnership(address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
+ * `AccessControl`: add internal `_grantRole(bytes32,address)` and `_revokeRole(bytes32,address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
+ * `AccessControl`: mark `_setupRole(bytes32,address)` as deprecated in favor of `_grantRole(bytes32,address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
+
 ## 4.3.1
 
  * `TimelockController`: Add additional isOperationReady check.
diff --git a/contracts/access/AccessControl.sol b/contracts/access/AccessControl.sol
index 08ab65f687b..e5c359552e5 100644
--- a/contracts/access/AccessControl.sol
+++ b/contracts/access/AccessControl.sol
@@ -178,6 +178,8 @@ abstract contract AccessControl is Context, IAccessControl, ERC165 {
      * Using this function in any other way is effectively circumventing the admin
      * system imposed by {AccessControl}.
      * ====
+     *
+     * NOTE: This function is deprecated in favor of {_grantRole}.
      */
     function _setupRole(bytes32 role, address account) internal virtual {
         _grantRole(role, account);
@@ -194,14 +196,24 @@ abstract contract AccessControl is Context, IAccessControl, ERC165 {
         emit RoleAdminChanged(role, previousAdminRole, adminRole);
     }
 
-    function _grantRole(bytes32 role, address account) private {
+    /**
+     * @dev Grants `role` to `account`.
+     *
+     * Internal function without access restriction.
+     */
+    function _grantRole(bytes32 role, address account) internal virtual {
         if (!hasRole(role, account)) {
             _roles[role].members[account] = true;
             emit RoleGranted(role, account, _msgSender());
         }
     }
 
-    function _revokeRole(bytes32 role, address account) private {
+    /**
+     * @dev Revokes `role` from `account`.
+     *
+     * Internal function without access restriction.
+     */
+    function _revokeRole(bytes32 role, address account) internal virtual {
         if (hasRole(role, account)) {
             _roles[role].members[account] = false;
             emit RoleRevoked(role, account, _msgSender());
diff --git a/contracts/access/Ownable.sol b/contracts/access/Ownable.sol
index 16469d5a6bb..3aff13f876e 100644
--- a/contracts/access/Ownable.sol
+++ b/contracts/access/Ownable.sol
@@ -25,7 +25,7 @@ abstract contract Ownable is Context {
      * @dev Initializes the contract setting the deployer as the initial owner.
      */
     constructor() {
-        _setOwner(_msgSender());
+        _transferOwnership(_msgSender());
     }
 
     /**
@@ -51,7 +51,7 @@ abstract contract Ownable is Context {
      * thereby removing any functionality that is only available to the owner.
      */
     function renounceOwnership() public virtual onlyOwner {
-        _setOwner(address(0));
+        _transferOwnership(address(0));
     }
 
     /**
@@ -60,10 +60,14 @@ abstract contract Ownable is Context {
      */
     function transferOwnership(address newOwner) public virtual onlyOwner {
         require(newOwner != address(0), "Ownable: new owner is the zero address");
-        _setOwner(newOwner);
+        _transferOwnership(newOwner);
     }
 
-    function _setOwner(address newOwner) private {
+    /**
+     * @dev Transfers ownership of the contract to a new account (`newOwner`).
+     * Internal function without access restriction.
+     */
+    function _transferOwnership(address newOwner) internal virtual {
         address oldOwner = _owner;
         _owner = newOwner;
         emit OwnershipTransferred(oldOwner, newOwner);

From bc5c8e2c9cc1470a75044e5c35759bffcea0348d Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Tue, 14 Sep 2021 16:55:02 -0300
Subject: [PATCH 12/24] Improve wording of recommendation in Initializable

---
 contracts/proxy/utils/Initializable.sol | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/contracts/proxy/utils/Initializable.sol b/contracts/proxy/utils/Initializable.sol
index 6e6c906ea51..fb1391e9910 100644
--- a/contracts/proxy/utils/Initializable.sol
+++ b/contracts/proxy/utils/Initializable.sol
@@ -18,10 +18,9 @@ pragma solidity ^0.8.0;
  * ====
  * Avoid leaving a contract uninitialized.
  *
- * An uninitialized contract can be used in certain kinds of exploits since it may allow an attacker to take control of
- * the contract. This includes the implementation contract behind a proxy. You can either invoke the initializer
- * manually, independently of initialization of the proxy, or you can include a constructor to automatically mark it as
- * initialized when it is deployed:
+ * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
+ * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
+ * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
  *
  * [.hljs-theme-light.nopadding]
  * ```

From d02cc020e85e33053062f70b18ee98a0cb4be427 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Tue, 14 Sep 2021 17:29:19 -0300
Subject: [PATCH 13/24] Remove deprecated prepublish script

---
 package.json                         | 4 ++--
 scripts/prepare-contracts-package.sh | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/package.json b/package.json
index c47b3a787a2..beaf4f6d3ec 100644
--- a/package.json
+++ b/package.json
@@ -22,8 +22,8 @@
     "lint:js:fix": "eslint --ignore-path .gitignore . --fix",
     "lint:sol": "solhint 'contracts/**/*.sol' && prettier -c 'contracts/**/*.sol'",
     "lint:sol:fix": "prettier --write \"contracts/**/*.sol\"",
-    "prepublish": "rimraf build contracts/build artifacts cache",
-    "prepare": "env COMPILE_MODE=production npm run compile",
+    "clean": "hardhat clean && rimraf build contracts/build",
+    "prepare": "npm run clean && env COMPILE_MODE=production npm run compile",
     "prepack": "scripts/prepack.sh",
     "release": "scripts/release/release.sh",
     "version": "scripts/release/version.sh",
diff --git a/scripts/prepare-contracts-package.sh b/scripts/prepare-contracts-package.sh
index 66feb25a13f..3f62fd419dd 100755
--- a/scripts/prepare-contracts-package.sh
+++ b/scripts/prepare-contracts-package.sh
@@ -5,7 +5,7 @@ cd "$(git rev-parse --show-toplevel)"
 
 # avoids re-compilation during publishing of both packages
 if [[ ! -v ALREADY_COMPILED ]]; then
-  npm run prepublish
+  npm run clean
   npm run prepare
   npm run prepack
 fi

From 6241995ad323952e38f8d405103ed994a2dcde8e Mon Sep 17 00:00:00 2001
From: Hadrien Croubois <hadrien.croubois@gmail.com>
Date: Tue, 14 Sep 2021 16:50:27 -0300
Subject: [PATCH 14/24] Restrict upgrade to proxy context in UUPSUpgradeable

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
---
 CHANGELOG.md                              |  4 ++++
 contracts/proxy/utils/UUPSUpgradeable.sol | 22 +++++++++++++++++++---
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e06138d0f61..e9173c558a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@
  * `AccessControl`: add internal `_grantRole(bytes32,address)` and `_revokeRole(bytes32,address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
  * `AccessControl`: mark `_setupRole(bytes32,address)` as deprecated in favor of `_grantRole(bytes32,address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
 
+## 4.3.2
+
+ * `UUPSUpgradeable`: Add modifiers to prevent `upgradeTo` and `upgradeToAndCall` being executed on any contract that is not the active ERC1967 proxy. This prevents these functions being called on implementation contracts or minimal ERC1167 clones, in particular.
+
 ## 4.3.1
 
  * `TimelockController`: Add additional isOperationReady check.
diff --git a/contracts/proxy/utils/UUPSUpgradeable.sol b/contracts/proxy/utils/UUPSUpgradeable.sol
index eeb528967ad..a88b2c23b47 100644
--- a/contracts/proxy/utils/UUPSUpgradeable.sol
+++ b/contracts/proxy/utils/UUPSUpgradeable.sol
@@ -17,6 +17,22 @@ import "../ERC1967/ERC1967Upgrade.sol";
  * _Available since v4.1._
  */
 abstract contract UUPSUpgradeable is ERC1967Upgrade {
+    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
+    address private immutable __self = address(this);
+
+    /**
+     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
+     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
+     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
+     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
+     * fail.
+     */
+    modifier onlyProxy() {
+        require(address(this) != __self, "Function must be called through delegatecall");
+        require(_getImplementation() == __self, "Function must be called through active proxy");
+        _;
+    }
+
     /**
      * @dev Upgrade the implementation of the proxy to `newImplementation`.
      *
@@ -24,9 +40,9 @@ abstract contract UUPSUpgradeable is ERC1967Upgrade {
      *
      * Emits an {Upgraded} event.
      */
-    function upgradeTo(address newImplementation) external virtual {
+    function upgradeTo(address newImplementation) external virtual onlyProxy {
         _authorizeUpgrade(newImplementation);
-        _upgradeToAndCallSecure(newImplementation, bytes(""), false);
+        _upgradeToAndCallSecure(newImplementation, new bytes(0), false);
     }
 
     /**
@@ -37,7 +53,7 @@ abstract contract UUPSUpgradeable is ERC1967Upgrade {
      *
      * Emits an {Upgraded} event.
      */
-    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual {
+    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
         _authorizeUpgrade(newImplementation);
         _upgradeToAndCallSecure(newImplementation, data, true);
     }

From 024cc50df478d2e8f78539819749e94d6df60592 Mon Sep 17 00:00:00 2001
From: Hadrien Croubois <hadrien.croubois@gmail.com>
Date: Tue, 14 Sep 2021 16:50:27 -0300
Subject: [PATCH 15/24] Restrict upgrade to proxy context in UUPSUpgradeable

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
(cherry picked from commit 6241995ad323952e38f8d405103ed994a2dcde8e)
---
 CHANGELOG.md                              |  4 ++++
 contracts/proxy/utils/UUPSUpgradeable.sol | 22 +++++++++++++++++++---
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6976a94dc7..7fa6e4ad51d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 4.3.2
+
+ * `UUPSUpgradeable`: Add modifiers to prevent `upgradeTo` and `upgradeToAndCall` being executed on any contract that is not the active ERC1967 proxy. This prevents these functions being called on implementation contracts or minimal ERC1167 clones, in particular.
+
 ## 4.3.1 (2021-08-26)
 
  * `TimelockController`: Add additional isOperationReady check.
diff --git a/contracts/proxy/utils/UUPSUpgradeable.sol b/contracts/proxy/utils/UUPSUpgradeable.sol
index eeb528967ad..a88b2c23b47 100644
--- a/contracts/proxy/utils/UUPSUpgradeable.sol
+++ b/contracts/proxy/utils/UUPSUpgradeable.sol
@@ -17,6 +17,22 @@ import "../ERC1967/ERC1967Upgrade.sol";
  * _Available since v4.1._
  */
 abstract contract UUPSUpgradeable is ERC1967Upgrade {
+    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
+    address private immutable __self = address(this);
+
+    /**
+     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
+     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
+     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
+     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
+     * fail.
+     */
+    modifier onlyProxy() {
+        require(address(this) != __self, "Function must be called through delegatecall");
+        require(_getImplementation() == __self, "Function must be called through active proxy");
+        _;
+    }
+
     /**
      * @dev Upgrade the implementation of the proxy to `newImplementation`.
      *
@@ -24,9 +40,9 @@ abstract contract UUPSUpgradeable is ERC1967Upgrade {
      *
      * Emits an {Upgraded} event.
      */
-    function upgradeTo(address newImplementation) external virtual {
+    function upgradeTo(address newImplementation) external virtual onlyProxy {
         _authorizeUpgrade(newImplementation);
-        _upgradeToAndCallSecure(newImplementation, bytes(""), false);
+        _upgradeToAndCallSecure(newImplementation, new bytes(0), false);
     }
 
     /**
@@ -37,7 +53,7 @@ abstract contract UUPSUpgradeable is ERC1967Upgrade {
      *
      * Emits an {Upgraded} event.
      */
-    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual {
+    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
         _authorizeUpgrade(newImplementation);
         _upgradeToAndCallSecure(newImplementation, data, true);
     }

From 0c4de6721d9668d7b5b2c5a9400fd0b2a5e8de90 Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Tue, 14 Sep 2021 18:06:39 -0300
Subject: [PATCH 16/24] 4.3.2

---
 CHANGELOG.md           | 2 +-
 contracts/package.json | 2 +-
 package-lock.json      | 4 ++--
 package.json           | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fa6e4ad51d..0fdad388f22 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 4.3.2
+## 4.3.2 (2021-09-14)
 
  * `UUPSUpgradeable`: Add modifiers to prevent `upgradeTo` and `upgradeToAndCall` being executed on any contract that is not the active ERC1967 proxy. This prevents these functions being called on implementation contracts or minimal ERC1167 clones, in particular.
 
diff --git a/contracts/package.json b/contracts/package.json
index 654d0f82080..c8705f0e5ef 100644
--- a/contracts/package.json
+++ b/contracts/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@openzeppelin/contracts",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "4.3.1",
+  "version": "4.3.2",
   "files": [
     "**/*.sol",
     "/build/contracts/*.json",
diff --git a/package-lock.json b/package-lock.json
index c267c0a60ba..11b003f0238 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "openzeppelin-solidity",
-  "version": "4.3.1",
+  "version": "4.3.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "openzeppelin-solidity",
-      "version": "4.3.1",
+      "version": "4.3.2",
       "license": "MIT",
       "bin": {
         "openzeppelin-contracts-migrate-imports": "scripts/migrate-imports.js"
diff --git a/package.json b/package.json
index b23f0a1c743..ab358d22f14 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "openzeppelin-solidity",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "4.3.1",
+  "version": "4.3.2",
   "files": [
     "/contracts/**/*.sol",
     "/build/contracts/*.json",

From 01f2ff1ba1220d7d3a0642014d30543bfcbb41ee Mon Sep 17 00:00:00 2001
From: Hadrien Croubois <hadrien.croubois@gmail.com>
Date: Fri, 17 Sep 2021 16:57:00 +0200
Subject: [PATCH 17/24] Allow Governor + CompoundTimelock to manage native
 tokens (eth) in and out of the timelock contract. (#2849)

* Change GovernorTimelockCompound to support ETH in Timelock

* refactor compound timelock module

* Allow governor to receive ETH is executor == address(this)
---
 contracts/governance/Governor.sol                          | 7 +++++++
 .../governance/extensions/GovernorTimelockCompound.sol     | 3 ++-
 contracts/mocks/GovernorCompMock.sol                       | 2 --
 contracts/mocks/GovernorMock.sol                           | 2 --
 4 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/contracts/governance/Governor.sol b/contracts/governance/Governor.sol
index 1dfd0dae8a1..741e02f7d98 100644
--- a/contracts/governance/Governor.sol
+++ b/contracts/governance/Governor.sol
@@ -55,6 +55,13 @@ abstract contract Governor is Context, ERC165, EIP712, IGovernor {
         _name = name_;
     }
 
+    /**
+     * @dev Function to receive ETH that will be handled by the governor (disabled if executor is a third party contract)
+     */
+    receive() external payable virtual {
+        require(_executor() == address(this));
+    }
+
     /**
      * @dev See {IERC165-supportsInterface}.
      */
diff --git a/contracts/governance/extensions/GovernorTimelockCompound.sol b/contracts/governance/extensions/GovernorTimelockCompound.sol
index 84fc272656e..415a52b998c 100644
--- a/contracts/governance/extensions/GovernorTimelockCompound.sol
+++ b/contracts/governance/extensions/GovernorTimelockCompound.sol
@@ -177,8 +177,9 @@ abstract contract GovernorTimelockCompound is IGovernorTimelock, Governor {
     ) internal virtual override {
         uint256 eta = proposalEta(proposalId);
         require(eta > 0, "GovernorTimelockCompound: proposal not yet queued");
+        Address.sendValue(payable(_timelock), msg.value);
         for (uint256 i = 0; i < targets.length; ++i) {
-            _timelock.executeTransaction{value: values[i]}(targets[i], values[i], "", calldatas[i], eta);
+            _timelock.executeTransaction(targets[i], values[i], "", calldatas[i], eta);
         }
     }
 
diff --git a/contracts/mocks/GovernorCompMock.sol b/contracts/mocks/GovernorCompMock.sol
index a0381f2daa7..299a90ac7cb 100644
--- a/contracts/mocks/GovernorCompMock.sol
+++ b/contracts/mocks/GovernorCompMock.sol
@@ -20,8 +20,6 @@ contract GovernorCompMock is Governor, GovernorVotesComp, GovernorCountingSimple
         _votingPeriod = votingPeriod_;
     }
 
-    receive() external payable {}
-
     function votingDelay() public view override returns (uint256) {
         return _votingDelay;
     }
diff --git a/contracts/mocks/GovernorMock.sol b/contracts/mocks/GovernorMock.sol
index f31269055e6..362ce7bc495 100644
--- a/contracts/mocks/GovernorMock.sol
+++ b/contracts/mocks/GovernorMock.sol
@@ -21,8 +21,6 @@ contract GovernorMock is Governor, GovernorVotesQuorumFraction, GovernorCounting
         _votingPeriod = votingPeriod_;
     }
 
-    receive() external payable {}
-
     function votingDelay() public view override returns (uint256) {
         return _votingDelay;
     }

From 6af4ed6169ee4165ce86457f98c0a568bd9d7491 Mon Sep 17 00:00:00 2001
From: Simon Perriard <simon.perriard@epfl.ch>
Date: Tue, 21 Sep 2021 10:16:14 +0200
Subject: [PATCH 18/24] revokeRole spec mismatch (#2872)

revokeRole emits {RoleRevoked} event if `account` has been revoked `role`

Greetings from ChainSecurity!
---
 contracts/access/AccessControl.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contracts/access/AccessControl.sol b/contracts/access/AccessControl.sol
index e5c359552e5..a60d3b90fbd 100644
--- a/contracts/access/AccessControl.sol
+++ b/contracts/access/AccessControl.sol
@@ -150,7 +150,7 @@ abstract contract AccessControl is Context, IAccessControl, ERC165 {
      * purpose is to provide a mechanism for accounts to lose their privileges
      * if they are compromised (such as when a trusted device is misplaced).
      *
-     * If the calling account had been granted `role`, emits a {RoleRevoked}
+     * If the calling account had been revoked `role`, emits a {RoleRevoked}
      * event.
      *
      * Requirements:

From f77fd4667e9f0574bdcb8c7dafdc62907608ffaa Mon Sep 17 00:00:00 2001
From: Joey <31974730+Joeysantoro@users.noreply.github.com>
Date: Thu, 23 Sep 2021 01:37:02 -0700
Subject: [PATCH 19/24] fix typo in GovernorCountingSimple (#2879)

Co-authored-by: Joey Santoro <joseph.santoro@duke.edu>
---
 contracts/governance/extensions/GovernorCountingSimple.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contracts/governance/extensions/GovernorCountingSimple.sol b/contracts/governance/extensions/GovernorCountingSimple.sol
index f1cffb5b991..399f8d7fee1 100644
--- a/contracts/governance/extensions/GovernorCountingSimple.sol
+++ b/contracts/governance/extensions/GovernorCountingSimple.sol
@@ -70,7 +70,7 @@ abstract contract GovernorCountingSimple is Governor {
     }
 
     /**
-     * @dev See {Governor-_voteSucceeded}. In this module, the forVotes must be scritly over the againstVotes.
+     * @dev See {Governor-_voteSucceeded}. In this module, the forVotes must be strictly over the againstVotes.
      */
     function _voteSucceeded(uint256 proposalId) internal view virtual override returns (bool) {
         ProposalVote storage proposalvote = _proposalVotes[proposalId];

From 1b27c13096d6e4389d62e7b0766a1db53fbb3f1b Mon Sep 17 00:00:00 2001
From: Nicolas Mahe <nicolas@mahe.me>
Date: Fri, 24 Sep 2021 20:27:53 +0700
Subject: [PATCH 20/24] Fix typo in doc of SignatureChecker (#2881)

---
 contracts/utils/cryptography/SignatureChecker.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contracts/utils/cryptography/SignatureChecker.sol b/contracts/utils/cryptography/SignatureChecker.sol
index 71e30eb5b54..e02eac15275 100644
--- a/contracts/utils/cryptography/SignatureChecker.sol
+++ b/contracts/utils/cryptography/SignatureChecker.sol
@@ -8,7 +8,7 @@ import "../../interfaces/IERC1271.sol";
 
 /**
  * @dev Signature verification helper: Provide a single mechanism to verify both private-key (EOA) ECDSA signature and
- * ERC1271 contract sigantures. Using this instead of ECDSA.recover in your contract will make them compatible with
+ * ERC1271 contract signatures. Using this instead of ECDSA.recover in your contract will make them compatible with
  * smart contract wallets such as Argent and Gnosis.
  *
  * Note: unlike ECDSA signatures, contract signature's are revocable, and the outcome of this function can thus change

From 6f23efa97056e643cefceedf86fdf1206b6840fb Mon Sep 17 00:00:00 2001
From: Francisco Giordano <frangio.1@gmail.com>
Date: Tue, 5 Oct 2021 11:12:51 -0300
Subject: [PATCH 21/24] Review wording of SafeMath need in Solidity 0.8 (#2898)

---
 contracts/utils/math/SafeMath.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contracts/utils/math/SafeMath.sol b/contracts/utils/math/SafeMath.sol
index 112eed1a8e6..7dfad52551d 100644
--- a/contracts/utils/math/SafeMath.sol
+++ b/contracts/utils/math/SafeMath.sol
@@ -9,7 +9,7 @@ pragma solidity ^0.8.0;
 /**
  * @dev Wrappers over Solidity's arithmetic operations.
  *
- * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
+ * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
  * now has built in overflow checking.
  */
 library SafeMath {

From 75d422feca902d155d478b56cdf67cf1cf3e3527 Mon Sep 17 00:00:00 2001
From: "renovate[bot]" <29139614+renovate[bot]@users.noreply.github.com>
Date: Tue, 5 Oct 2021 22:36:25 -0300
Subject: [PATCH 22/24] Update lockfile (#2842)

Co-authored-by: Renovate Bot <bot@renovateapp.com>
---
 package-lock.json | 6163 ++++++++++++++++++++++++++++++---------------
 1 file changed, 4111 insertions(+), 2052 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index b9700053be9..7bdb9e54016 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -60,9 +60,9 @@
       }
     },
     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.14.9",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.9.tgz",
-      "integrity": "sha512-pQYxPY0UP6IHISRitNe8bsijHex4TWZXi2HwKVsjPiltzlhse2znVcm9Ace510VT1kxIHjGJCZZQBX2gJDbo0g==",
+      "version": "7.15.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.15.7.tgz",
+      "integrity": "sha512-K4JvCtQqad9OY2+yTU8w+E82ywk/fe+ELNlt1G8z3bVGlZfn/hOcQQsUhGhW/N+tb3fxK800wLtKOE/aM0m72w==",
       "dev": true,
       "engines": {
         "node": ">=6.9.0"
@@ -145,9 +145,9 @@
       }
     },
     "node_modules/@babel/runtime": {
-      "version": "7.15.3",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.15.3.tgz",
-      "integrity": "sha512-OvwMLqNXkCXSz1kSm58sEsNuhqOx/fKpnUnKnFB5v8uDda5bLNEHNgKPvhDN6IU0LDcnHQ90LlJ0Q6jnyBSIBA==",
+      "version": "7.15.4",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.15.4.tgz",
+      "integrity": "sha512-99catp6bHCaxr4sJ/DbTGgHS4+Rs2RVd2g7iOap6SLGPDknRK9ztKNsE/Fg6QhSeh1FGE5f6gHGQmvvn3I3xhw==",
       "dev": true,
       "dependencies": {
         "regenerator-runtime": "^0.13.4"
@@ -156,6 +156,109 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@codechecks/client": {
+      "version": "0.1.11",
+      "resolved": "https://registry.npmjs.org/@codechecks/client/-/client-0.1.11.tgz",
+      "integrity": "sha512-dSIzHnGNcXxDZtnVQEXWQHXH2v9KrpnK4mDGDxdwSu3l00rOIVwJcttj0wzx0bC0Q6gs65VsQdZH4gkanLdXOA==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "bluebird": "^3.5.3",
+        "chalk": "^2.4.2",
+        "commander": "^2.19.0",
+        "debug": "^4.1.1",
+        "execa": "^1.0.0",
+        "glob": "^7.1.3",
+        "graceful-fs": "^4.1.15",
+        "js-yaml": "^3.13.1",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.11",
+        "marked": "^0.7.0",
+        "marked-terminal": "^3.3.0",
+        "mkdirp": "^0.5.1",
+        "ms": "^2.1.1",
+        "promise": "^8.0.2",
+        "request": "^2.88.0",
+        "request-promise": "^4.2.2",
+        "ts-essentials": "^1.0.2",
+        "ts-node": "^8.0.2",
+        "url-join": "^4.0.0"
+      },
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@@ -2874,9 +3770,9 @@
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       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -35456,17 +37508,17 @@
       "dev": true
     },
     "which-typed-array": {
-      "version": "1.1.6",
-      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.6.tgz",
-      "integrity": "sha512-DdY984dGD5sQ7Tf+x1CkXzdg85b9uEel6nr4UkFg1LoE9OXv3uRuZhe5CoWdawhGACeFpEZXH8fFLQnDhbpm/Q==",
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.7.tgz",
+      "integrity": "sha512-vjxaB4nfDqwKI0ws7wZpxIlde1XrLX5uB0ZjpfshgmapJMD7jJWhZI+yToJTqaFByF0eNBcYxbjmCzoRP7CfEw==",
       "dev": true,
       "requires": {
-        "available-typed-arrays": "^1.0.4",
+        "available-typed-arrays": "^1.0.5",
         "call-bind": "^1.0.2",
         "es-abstract": "^1.18.5",
         "foreach": "^2.0.5",
         "has-tostringtag": "^1.0.0",
-        "is-typed-array": "^1.1.6"
+        "is-typed-array": "^1.1.7"
       }
     },
     "wide-align": {
@@ -35488,9 +37540,9 @@
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "5.0.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
-          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+          "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
           "dev": true
         },
         "emoji-regex": {
@@ -35506,31 +37558,31 @@
           "dev": true
         },
         "string-width": {
-          "version": "4.2.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.2.tgz",
-          "integrity": "sha512-XBJbT3N4JhVumXE0eoLU9DCjcaF92KLNqTmFCnG1pf8duUxFGwtP6AD6nkjw9a3IdiRtL3E2w3JDiE/xi3vOeA==",
+          "version": "4.2.3",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+          "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
           "dev": true,
           "requires": {
             "emoji-regex": "^8.0.0",
             "is-fullwidth-code-point": "^3.0.0",
-            "strip-ansi": "^6.0.0"
+            "strip-ansi": "^6.0.1"
           }
         },
         "strip-ansi": {
-          "version": "6.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
-          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "version": "6.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+          "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
           "dev": true,
           "requires": {
-            "ansi-regex": "^5.0.0"
+            "ansi-regex": "^5.0.1"
           }
         }
       }
     },
     "window-size": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
-      "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.2.0.tgz",
+      "integrity": "sha1-tDFbtCFKPXBY6+7okuE/ok2YsHU=",
       "dev": true
     },
     "word-wrap": {
@@ -35557,9 +37609,9 @@
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "5.0.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
-          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+          "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
           "dev": true
         },
         "emoji-regex": {
@@ -35575,23 +37627,23 @@
           "dev": true
         },
         "string-width": {
-          "version": "4.2.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.2.tgz",
-          "integrity": "sha512-XBJbT3N4JhVumXE0eoLU9DCjcaF92KLNqTmFCnG1pf8duUxFGwtP6AD6nkjw9a3IdiRtL3E2w3JDiE/xi3vOeA==",
+          "version": "4.2.3",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+          "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
           "dev": true,
           "requires": {
             "emoji-regex": "^8.0.0",
             "is-fullwidth-code-point": "^3.0.0",
-            "strip-ansi": "^6.0.0"
+            "strip-ansi": "^6.0.1"
           }
         },
         "strip-ansi": {
-          "version": "6.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
-          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "version": "6.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+          "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
           "dev": true,
           "requires": {
-            "ansi-regex": "^5.0.0"
+            "ansi-regex": "^5.0.1"
           }
         }
       }
@@ -35612,9 +37664,9 @@
       }
     },
     "ws": {
-      "version": "7.5.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.3.tgz",
-      "integrity": "sha512-kQ/dHIzuLrS6Je9+uv81ueZomEwH0qVYstcAQ4/Z93K8zeko9gtAbttJWzoC5ukqXY1PpoouV3+VSOqEAFt5wg==",
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.5.tgz",
+      "integrity": "sha512-BAkMFcAzl8as1G/hArkxOxq3G7pjUqQ3gzYbLL0/5zNkph70e+lCoxBGnm6AW1+/aiNeV4fnKqZ8m4GZewmH2w==",
       "dev": true,
       "requires": {}
     },
@@ -35709,9 +37761,9 @@
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "5.0.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
-          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+          "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
           "dev": true
         },
         "emoji-regex": {
@@ -35727,23 +37779,23 @@
           "dev": true
         },
         "string-width": {
-          "version": "4.2.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.2.tgz",
-          "integrity": "sha512-XBJbT3N4JhVumXE0eoLU9DCjcaF92KLNqTmFCnG1pf8duUxFGwtP6AD6nkjw9a3IdiRtL3E2w3JDiE/xi3vOeA==",
+          "version": "4.2.3",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+          "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
           "dev": true,
           "requires": {
             "emoji-regex": "^8.0.0",
             "is-fullwidth-code-point": "^3.0.0",
-            "strip-ansi": "^6.0.0"
+            "strip-ansi": "^6.0.1"
           }
         },
         "strip-ansi": {
-          "version": "6.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
-          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "version": "6.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+          "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
           "dev": true,
           "requires": {
-            "ansi-regex": "^5.0.0"
+            "ansi-regex": "^5.0.1"
           }
         },
         "yargs-parser": {
@@ -35920,6 +37972,13 @@
           }
         }
       }
+    },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true,
+      "peer": true
     }
   }
 }

From 29eeb2828e4d8319c5414aafef411fab166ab438 Mon Sep 17 00:00:00 2001
From: Anton Bukov <k06aaa@gmail.com>
Date: Wed, 6 Oct 2021 15:24:46 +0200
Subject: [PATCH 23/24] Fix EIP712 for delegatecalls (#2852)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
---
 CHANGELOG.md                                  | 1 +
 contracts/utils/cryptography/draft-EIP712.sol | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 607d864b75e..e7527eff477 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
  * `Ownable`: add an internal `_transferOwnership(address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
  * `AccessControl`: add internal `_grantRole(bytes32,address)` and `_revokeRole(bytes32,address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
  * `AccessControl`: mark `_setupRole(bytes32,address)` as deprecated in favor of `_grantRole(bytes32,address)`. ([#2568](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2568))
+ * `EIP712`: cache `address(this)` to immutable storage to avoid potential issues if a vanilla contract is used in a delegatecall context. ([#2852](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/#2852))
 
 ## 4.3.2 (2021-09-14)
 
diff --git a/contracts/utils/cryptography/draft-EIP712.sol b/contracts/utils/cryptography/draft-EIP712.sol
index 2d45fa4eeb2..a372b8de888 100644
--- a/contracts/utils/cryptography/draft-EIP712.sol
+++ b/contracts/utils/cryptography/draft-EIP712.sol
@@ -29,6 +29,7 @@ abstract contract EIP712 {
     // invalidate the cached domain separator if the chain id changes.
     bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
     uint256 private immutable _CACHED_CHAIN_ID;
+    address private immutable _CACHED_THIS;
 
     bytes32 private immutable _HASHED_NAME;
     bytes32 private immutable _HASHED_VERSION;
@@ -58,6 +59,7 @@ abstract contract EIP712 {
         _HASHED_VERSION = hashedVersion;
         _CACHED_CHAIN_ID = block.chainid;
         _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
+        _CACHED_THIS = address(this);
         _TYPE_HASH = typeHash;
     }
 
@@ -65,7 +67,7 @@ abstract contract EIP712 {
      * @dev Returns the domain separator for the current chain.
      */
     function _domainSeparatorV4() internal view returns (bytes32) {
-        if (block.chainid == _CACHED_CHAIN_ID) {
+        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
             return _CACHED_DOMAIN_SEPARATOR;
         } else {
             return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);

From e2fa301bfb632c622b824101eb883001639c7f0a Mon Sep 17 00:00:00 2001
From: Hadrien Croubois <hadrien.croubois@gmail.com>
Date: Wed, 6 Oct 2021 15:34:27 +0200
Subject: [PATCH 24/24] Improve parameters naming and remove unecessary returns
 (#2891)

---
 contracts/token/ERC1155/ERC1155.sol           | 52 +++++++++----------
 .../token/ERC20/extensions/ERC20Votes.sol     |  4 +-
 2 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/contracts/token/ERC1155/ERC1155.sol b/contracts/token/ERC1155/ERC1155.sol
index 634f389345d..7f2fb65405a 100644
--- a/contracts/token/ERC1155/ERC1155.sol
+++ b/contracts/token/ERC1155/ERC1155.sol
@@ -249,32 +249,32 @@ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
     }
 
     /**
-     * @dev Creates `amount` tokens of token type `id`, and assigns them to `account`.
+     * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.
      *
      * Emits a {TransferSingle} event.
      *
      * Requirements:
      *
-     * - `account` cannot be the zero address.
-     * - If `account` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
+     * - `to` cannot be the zero address.
+     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
      * acceptance magic value.
      */
     function _mint(
-        address account,
+        address to,
         uint256 id,
         uint256 amount,
         bytes memory data
     ) internal virtual {
-        require(account != address(0), "ERC1155: mint to the zero address");
+        require(to != address(0), "ERC1155: mint to the zero address");
 
         address operator = _msgSender();
 
-        _beforeTokenTransfer(operator, address(0), account, _asSingletonArray(id), _asSingletonArray(amount), data);
+        _beforeTokenTransfer(operator, address(0), to, _asSingletonArray(id), _asSingletonArray(amount), data);
 
-        _balances[id][account] += amount;
-        emit TransferSingle(operator, address(0), account, id, amount);
+        _balances[id][to] += amount;
+        emit TransferSingle(operator, address(0), to, id, amount);
 
-        _doSafeTransferAcceptanceCheck(operator, address(0), account, id, amount, data);
+        _doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
     }
 
     /**
@@ -309,31 +309,31 @@ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
     }
 
     /**
-     * @dev Destroys `amount` tokens of token type `id` from `account`
+     * @dev Destroys `amount` tokens of token type `id` from `from`
      *
      * Requirements:
      *
-     * - `account` cannot be the zero address.
-     * - `account` must have at least `amount` tokens of token type `id`.
+     * - `from` cannot be the zero address.
+     * - `from` must have at least `amount` tokens of token type `id`.
      */
     function _burn(
-        address account,
+        address from,
         uint256 id,
         uint256 amount
     ) internal virtual {
-        require(account != address(0), "ERC1155: burn from the zero address");
+        require(from != address(0), "ERC1155: burn from the zero address");
 
         address operator = _msgSender();
 
-        _beforeTokenTransfer(operator, account, address(0), _asSingletonArray(id), _asSingletonArray(amount), "");
+        _beforeTokenTransfer(operator, from, address(0), _asSingletonArray(id), _asSingletonArray(amount), "");
 
-        uint256 accountBalance = _balances[id][account];
-        require(accountBalance >= amount, "ERC1155: burn amount exceeds balance");
+        uint256 fromBalance = _balances[id][from];
+        require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
         unchecked {
-            _balances[id][account] = accountBalance - amount;
+            _balances[id][from] = fromBalance - amount;
         }
 
-        emit TransferSingle(operator, account, address(0), id, amount);
+        emit TransferSingle(operator, from, address(0), id, amount);
     }
 
     /**
@@ -344,29 +344,29 @@ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
      * - `ids` and `amounts` must have the same length.
      */
     function _burnBatch(
-        address account,
+        address from,
         uint256[] memory ids,
         uint256[] memory amounts
     ) internal virtual {
-        require(account != address(0), "ERC1155: burn from the zero address");
+        require(from != address(0), "ERC1155: burn from the zero address");
         require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
 
         address operator = _msgSender();
 
-        _beforeTokenTransfer(operator, account, address(0), ids, amounts, "");
+        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");
 
         for (uint256 i = 0; i < ids.length; i++) {
             uint256 id = ids[i];
             uint256 amount = amounts[i];
 
-            uint256 accountBalance = _balances[id][account];
-            require(accountBalance >= amount, "ERC1155: burn amount exceeds balance");
+            uint256 fromBalance = _balances[id][from];
+            require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
             unchecked {
-                _balances[id][account] = accountBalance - amount;
+                _balances[id][from] = fromBalance - amount;
             }
         }
 
-        emit TransferBatch(operator, account, address(0), ids, amounts);
+        emit TransferBatch(operator, from, address(0), ids, amounts);
     }
 
     /**
diff --git a/contracts/token/ERC20/extensions/ERC20Votes.sol b/contracts/token/ERC20/extensions/ERC20Votes.sol
index 4df8311359b..6439f14f097 100644
--- a/contracts/token/ERC20/extensions/ERC20Votes.sol
+++ b/contracts/token/ERC20/extensions/ERC20Votes.sol
@@ -134,7 +134,7 @@ abstract contract ERC20Votes is ERC20Permit {
      * @dev Delegate votes from the sender to `delegatee`.
      */
     function delegate(address delegatee) public virtual {
-        return _delegate(_msgSender(), delegatee);
+        _delegate(_msgSender(), delegatee);
     }
 
     /**
@@ -156,7 +156,7 @@ abstract contract ERC20Votes is ERC20Permit {
             s
         );
         require(nonce == _useNonce(signer), "ERC20Votes: invalid nonce");
-        return _delegate(signer, delegatee);
+        _delegate(signer, delegatee);
     }
 
     /**