Add sysvar_get lint

Author: Vara Prasad Bandaru

README.md

@@ -15,6 +15,7 @@ The current lints are:
 | [`insecure_account_close`](lints/insecure_account_close)         | lint for [9-closing-accounts](https://github.com/coral-xyz/sealevel-attacks/tree/master/programs/9-closing-accounts)                     |
 | [`missing_owner_check`](lints/missing_owner_check)               | lint for [2-owner-checks](https://github.com/coral-xyz/sealevel-attacks/tree/master/programs/2-owner-checks)                             |
 | [`missing_signer_check`](lints/missing_signer_check)             | lint for [0-signer-authorization](https://github.com/coral-xyz/sealevel-attacks/tree/master/programs/0-signer-authorization)             |
+| [`sysvar_get`](lints/sysvar_get)                                 | Reports uses of `Sysvar::from_account_info` instead of `Sysvar::get`                                                                     |
 | [`type_cosplay`](lints/type_cosplay)                             | lint for [3-type-cosplay](https://github.com/coral-xyz/sealevel-attacks/tree/master/programs/3-type-cosplay)                             |
 
 ## Usage

crate/src/paths.rs

@@ -44,3 +44,13 @@ pub const SOLANA_PROGRAM_CREATE_PROGRAM_ADDRESS: [&str; 4] = [
 ];
 
 pub const SPL_TOKEN_INSTRUCTION: [&str; 2] = ["spl_token", "instruction"];
+
+pub const SYSVAR_FROM_ACCOUNT_INFO: [&str; 4] =
+    ["solana_program", "sysvar", "Sysvar", "from_account_info"];
+pub const SYSVAR_CLOCK: [&str; 3] = ["solana_program", "clock", "Clock"];
+pub const SYSVAR_EPOCH_REWARDS: [&str; 3] = ["solana_program", "epoch_rewards", "EpochRewards"];
+pub const SYSVAR_EPOCH_SCHEDULE: [&str; 3] = ["solana_program", "epoch_schedule", "EpochSchedule"];
+pub const SYSVAR_FEES: [&str; 3] = ["solana_program", "fees", "Fees"];
+pub const SYSVAR_LAST_RESTART_SLOT: [&str; 3] =
+    ["solana_program", "last_restart_slot", "LastRestartSlot"];
+pub const SYSVAR_RENT: [&str; 3] = ["solana_program", "rent", "Rent"];

lints/sysvar_get/.cargo/config.toml

@@ -0,0 +1,14 @@
+[build]
+target-dir = "../../target"
+
+[target.aarch64-apple-darwin]
+linker = "dylint-link"
+
+[target.x86_64-apple-darwin]
+linker = "dylint-link"
+
+[target.x86_64-unknown-linux-gnu]
+linker = "dylint-link"
+
+[target.x86_64-pc-windows-msvc]
+linker = "dylint-link"