Add test program for BPF memory corruption bug (#5603)

* Add test program for BPF memory corruption bug

* @jackcmay feedback

programs/bpf/rust/stack_bug/.gitignore

@@ -0,0 +1,4 @@
+/target/
+
+Cargo.lock
+/farf/

programs/bpf/rust/stack_bug/Cargo.toml

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+
+# Note: This crate must be built using build.sh
+
+[package]
+name = "solana-bpf-rust-stack-bug"
+version = "0.18.0-pre2"
+description = "Solana BPF iter program written in Rust"
+authors = ["Solana Maintainers <maintainers@solana.com>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[dependencies]
+solana-sdk-bpf-utils = { path = "../../../../sdk/bpf/rust/rust-utils", version = "0.18.0-pre2" }
+solana-sdk-bpf-no-std = { path = "../../../../sdk/bpf/rust/rust-no-std", version = "0.18.0-pre2" }
+solana-bpf-rust-stack-bug-dep = { path = "../stack_bug_dep", version = "0.18.0-pre2" }
+
+[dev_dependencies]
+solana-sdk-bpf-test = { path = "../../../../sdk/bpf/rust/rust-test", version = "0.18.0-pre2" }
+
+[workspace]
+members = []
+
+[lib]
+crate-type = ["cdylib"]
+name = "solana_bpf_rust_stack_bug"

programs/bpf/rust/stack_bug/Xargo.toml

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+[dependencies.compiler_builtins]
+path = "../../../../sdk/bpf/dependencies/rust-bpf-sysroot/src/compiler-builtins"
+features = ["c", "mem"]
+
+[target.bpfel-unknown-unknown.dependencies]
+alloc = { path = "../../../../sdk/bpf/dependencies/rust-bpf-sysroot/src/liballoc" }

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

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+//! @brief Example Rust-based BPF program tests loop iteration
+
+#![no_std]
+#![allow(unused_attributes)]
+
+#[macro_use]
+extern crate alloc;
+#[cfg(not(test))]
+extern crate solana_sdk_bpf_no_std;
+extern crate solana_sdk_bpf_utils;
+
+use alloc::vec::Vec;
+use solana_sdk_bpf_utils::info;
+use solana_sdk_bpf_utils::entrypoint;
+use solana_sdk_bpf_utils::entrypoint::{SolKeyedAccount, SolClusterInfo};
+use solana_bpf_rust_stack_bug_dep::{InitPollData, PollData};
+
+entrypoint!(process_instruction);
+fn process_instruction(ka: &mut [SolKeyedAccount], _info: &SolClusterInfo, _data: &[u8]) -> bool {
+    let header = vec![1u8; 6];
+    let option_a = vec![1u8; 1];
+    let option_b = vec![1u8; 1];
+    let init_poll = InitPollData {
+        timeout: 10u32,
+        header_len: 6,
+        header: &header,
+        option_a_len: 1,
+        option_a: &option_a,
+        option_b_len: 1,
+        option_b: &option_b,
+    };
+
+    let key1 = [1u8; 32];
+    let key2 = [1u8; 32];
+    let key3 = [1u8; 32];
+    let poll_data = PollData::init(init_poll, &key1, &key2, &key3, 5000);
+    poll_data.to_bytes();
+
+    info!("Success");
+    true
+}