mrwinstead/codeportfolio

A code portfolio.

CodePortfolio

Hello, I am Mike Winstead and I'd like to present the following repository as a sample of some of the programming work I've done in the past. If you'd like to know more about it, feel free to ask in our correspondence.

Contents

Recoverable Virtual Memory (C on Linux)

As part of my advanced operating systems course in my master's program, I needed to implement recoverable virtual memory (rvm) to make a memory region transaction-based and persistent across application crashes. This is my most complex C project at around 1000 lines to date with much work in data marshalling and self-created file formats. All my my work may be found in rvm.c.

As a security note, this rvm library is susceptible to a file format attack in which the attacker canges some of the offsets in the backing file for an application. Abuse of the blind trust in the backing file would allow an attacker to overwrite mapped-in regions of the target. The descision was taken to leave in the vulnerability as all recoverable regions of the application which are in the backing store would presumably be readable as well.

Explanation of the topic: https://cs.nyu.edu/rgrimm/teaching/sp08-os/rvm.pdf