Don't allow the payer to be initialized as a program account

CHANGELOG.md

@@ -38,6 +38,7 @@ The minor version will be incremented upon a breaking change and the patch versi
 - lang: Fix IDL `seed` generation for byte string literals. ([#2125](https://github.com/coral-xyz/anchor/pull/2125))
 - ts: Update seeds inference to allow nested user defined structs within the seeds ([#2198](https://github.com/coral-xyz/anchor/pull/2198))
 - event: Fix multiple event listeners with the same name. ([#2165](https://github.com/coral-xyz/anchor/pull/2165))
+- lang: Prevent the payer account from being initialized as a program account. ([#2284](https://github.com/coral-xyz/anchor/pull/2284))
 
 ### Breaking
 

lang/src/error.rs

@@ -194,6 +194,9 @@ pub enum ErrorCode {
     /// 4100 - The declared program id does not match actual program id
     #[msg("The declared program id does not match the actual program id")]
     DeclaredProgramIdMismatch = 4100,
+    /// 4101 - You cannot/should not initialize the payer account as a program account
+    #[msg("You cannot/should not initialize the payer account as a program account")]
+    TryingToInitPayerAsProgramAccount = 4101,
 
     // Deprecated
     /// 5000 - The API being used is deprecated and should no longer be used

lang/syn/src/codegen/accounts/constraints.rs

@@ -835,6 +835,7 @@ pub fn generate_create_account(
             let cpi_context = anchor_lang::context::CpiContext::new(system_program.to_account_info(), cpi_accounts);
             anchor_lang::system_program::create_account(cpi_context.with_signer(&[#seeds_with_nonce]), lamports, #space as u64, #owner)?;
         } else {
+            require_keys_neq!(payer.key(), #field.key(), anchor_lang::error::ErrorCode::TryingToInitPayerAsProgramAccount);
             // Fund the account for rent exemption.
             let required_lamports = __anchor_rent
                 .minimum_balance(#space)

tests/misc/tests/misc/misc.ts

@@ -580,6 +580,22 @@ describe("misc", () => {
     assert.strictEqual(account.data, 3);
   });
 
+  it("Should fail when trying to init the payer as a program account", async () => {
+    try {
+      await program.rpc.testInit({
+        accounts: {
+          data: provider.wallet.publicKey,
+          payer: provider.wallet.publicKey,
+          systemProgram: anchor.web3.SystemProgram.programId,
+        },
+      });
+      assert.fail("Transaction should fail");
+    } catch (e) {
+      // "Error Code: TryingToInitPayerAsProgramAccount. Error Number: 4101. Error Message: You cannot/should not initialize the payer account as a program account."
+      assert.strictEqual(e.error.errorCode.number, 4101);
+    }
+  });
+
   it("Can init a random zero copy account", async () => {
     const data = anchor.web3.Keypair.generate();
     await program.rpc.testInitZeroCopy({

tests/yarn.lock

@@ -69,7 +69,7 @@
     bn.js "^5.1.2"
     bs58 "^4.0.1"
     buffer-layout "^1.2.2"
-    camelcase "^5.3.1"
+    camelcase "^6.3.0"
     cross-fetch "^3.1.5"
     crypto-hash "^1.3.0"
     eventemitter3 "^4.0.7"
@@ -99,7 +99,7 @@
     snake-case "^3.0.4"
     toml "^3.0.0"
 
-"@project-serum/borsh@^0.2.5":
+"@project-serum/borsh@^0.2.2", "@project-serum/borsh@^0.2.5":
   version "0.2.5"
   resolved "https://registry.yarnpkg.com/@project-serum/borsh/-/borsh-0.2.5.tgz#6059287aa624ecebbfc0edd35e4c28ff987d8663"
   integrity sha512-UmeUkUoKdQ7rhx6Leve1SssMR/Ghv8qrEiyywyxSWg7ooV7StdpPBhciiy5eB3T0qU1BXvdRNC8TdrkxK7WC5Q==
@@ -175,27 +175,7 @@
     buffer-layout "^1.2.0"
     dotenv "10.0.0"
 
-"@solana/web3.js@^1.21.0":
-  version "1.30.2"
-  resolved "https://registry.yarnpkg.com/@solana/web3.js/-/web3.js-1.30.2.tgz#e85da75e0825dc64f53eb64a1ff0115b27bec135"
-  integrity sha512-hznCj+rkfvM5taRP3Z+l5lumB7IQnDrB4l55Wpsg4kDU9Zds8pE5YOH5Z9bbF/pUzZJKQjyBjnY/6kScBm3Ugg==
-  dependencies:
-    "@babel/runtime" "^7.12.5"
-    "@ethersproject/sha2" "^5.5.0"
-    "@solana/buffer-layout" "^3.0.0"
-    bn.js "^5.0.0"
-    borsh "^0.4.0"
-    bs58 "^4.0.1"
-    buffer "6.0.1"
-    cross-fetch "^3.1.4"
-    jayson "^3.4.4"
-    js-sha3 "^0.8.0"
-    rpc-websockets "^7.4.2"
-    secp256k1 "^4.0.2"
-    superstruct "^0.14.2"
-    tweetnacl "^1.0.0"
-
-"@solana/web3.js@^1.32.0":
+"@solana/web3.js@^1.17.0", "@solana/web3.js@^1.32.0":
   version "1.66.2"
   resolved "https://registry.yarnpkg.com/@solana/web3.js/-/web3.js-1.66.2.tgz#80b43c5868b846124fe3ebac7d3943930c3fa60c"
   integrity sha512-RyaHMR2jGmaesnYP045VLeBGfR/gAW3cvZHzMFGg7bkO+WOYOYp1nEllf0/la4U4qsYGKCsO9eEevR5fhHiVHg==
@@ -216,6 +196,26 @@
     rpc-websockets "^7.5.0"
     superstruct "^0.14.2"
 
+"@solana/web3.js@^1.21.0":
+  version "1.30.2"
+  resolved "https://registry.yarnpkg.com/@solana/web3.js/-/web3.js-1.30.2.tgz#e85da75e0825dc64f53eb64a1ff0115b27bec135"
+  integrity sha512-hznCj+rkfvM5taRP3Z+l5lumB7IQnDrB4l55Wpsg4kDU9Zds8pE5YOH5Z9bbF/pUzZJKQjyBjnY/6kScBm3Ugg==
+  dependencies:
+    "@babel/runtime" "^7.12.5"
+    "@ethersproject/sha2" "^5.5.0"
+    "@solana/buffer-layout" "^3.0.0"
+    bn.js "^5.0.0"
+    borsh "^0.4.0"
+    bs58 "^4.0.1"
+    buffer "6.0.1"
+    cross-fetch "^3.1.4"
+    jayson "^3.4.4"
+    js-sha3 "^0.8.0"
+    rpc-websockets "^7.4.2"
+    secp256k1 "^4.0.2"
+    superstruct "^0.14.2"
+    tweetnacl "^1.0.0"
+
 "@solana/web3.js@^1.64.0":
   version "1.64.0"
   resolved "https://registry.yarnpkg.com/@solana/web3.js/-/web3.js-1.64.0.tgz#b7f5a976976039a0161242e94d6e1224ab5d30f9"
@@ -522,6 +522,11 @@ camelcase@^6.0.0:
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-6.2.0.tgz#924af881c9d525ac9d87f40d964e5cea982a1809"
   integrity sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==
 
+camelcase@^6.3.0:
+  version "6.3.0"
+  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-6.3.0.tgz#5685b95eb209ac9c0c177467778c9c84df58ba9a"
+  integrity sha512-Gmy6FhYlCY7uOElZUSbxo2UCDH8owEk996gkbrpsgGtrJLM3J7jGxl9Ic7Qwwj4ivOE5AWZWRMecDdF7hqGjFA==
+
 chai@^4.3.4:
   version "4.3.4"
   resolved "https://registry.yarnpkg.com/chai/-/chai-4.3.4.tgz#b55e655b31e1eac7099be4c08c21964fce2e6c49"