[$] Tracking trust with Rust in the kernel

The Linux kernel has to handle many different sources of data that should notbe trusted: user space, network connections, and removable storage, to name afew. The kernel has to remain secure even if one of these sends garbled (ormalicious) data. Benno Lossin has been working on an API for kernel Rust codethat makes it harder to accidentally make decisions based on data from user space. That workis now on itsfourth revision, and Lossin has asked kernel developers to experiment withit and see where problems remain, making this a good time to look at the proposed API.