# `ckb-std-ld` > Zero cost stack overflow protection for CKB-VM > This repo is forked from https://github.com/japaric/cortex-m-rt-ld and changed some hard-coded values to make it works for RISC-V VM, thanks for @japaric 's work * [ckb-std](https://github.com/nervosnetwork/ckb-std) * [capsule](https://github.com/nervosnetwork/capsule) See [this blog post](http://blog.japaric.io/stack-overflow-protection) (@japaric 's blog) for background information ## License Licensed under either of - Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) - MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) at your option. ### Contribution Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.