Add program id spoof tests (#13866)

programs/bpf/rust/spoof1_system/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "solana-bpf-rust-spoof1-system"
+version = "1.5.0"
+description = "Solana BPF test program written in Rust"
+authors = ["Solana Maintainers <maintainers@solana.foundation>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[dependencies]
+solana-program = { path = "../../../../sdk/program", version = "1.5.0" }
+
+[lib]
+crate-type = ["cdylib"]
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]

programs/bpf/rust/spoof1_system/Xargo.toml

@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

programs/bpf/rust/spoof1_system/src/lib.rs

@@ -0,0 +1,19 @@
+use solana_program::{
+    account_info::AccountInfo, entrypoint, entrypoint::ProgramResult, pubkey::Pubkey,
+};
+
+entrypoint!(process_instruction);
+fn process_instruction(
+    _program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    _instruction_data: &[u8],
+) -> ProgramResult {
+    let from = &accounts[0];
+    let to = &accounts[1];
+
+    let to_balance = to.lamports();
+    **to.lamports.borrow_mut() = to_balance + from.lamports();
+    **from.lamports.borrow_mut() = 0u64;
+
+    Ok(())
+}