xous-core/services/pddb
bunnie 23a31c2cf0 fix PDDB initial stack size and increase heap limit on boot
I had thought there was an issue with heap size limit increases
and multithreading but I think actually the problem is the
PDDB runs pretty close to the stack size limit. This increases
the stack size limit for the PDDB on boot and also bumps up
the heap limit so caching can work more flawlessly.
2022-06-28 19:58:20 +08:00
..
locales add basis mount/unmount to pddb shell commands, fix some UX formatting 2022-04-07 15:32:47 +08:00
src fix PDDB initial stack size and increase heap limit on boot 2022-06-28 19:58:20 +08:00
Cargo.toml partial progress on #168 2022-06-20 14:15:53 +08:00
README.md Edit minor typos 2022-02-14 19:39:12 -05:00

PDDB

Documentation for the PDDB can be found in the headers of the source files:

  • main.rs contains a glossary, project overview, threat model, auditor's notes, and goals.
  • basis.rs gives details on how the data is organized in the Basis memory space, and contains most of the code for manipulating dictionary entries stored within the basis cache.
  • dictionary.rs will contain most of the code for manipulating the keys stored in a dictionary cache entry.
  • keys.rs documents the key cache format and on-disk metadata and data formats.
  • pagetable.rs documents the page table format.
  • hw.rs contains all the glue to the SPINOR layer, TRNG, and system time, as well as low-level routines for formatting the disk.
  • fastspace.rs contains the Fast Free Space optimization, which is a partial record of known free space in the PDDB. The very nature of plausible deniability requires this quirky structure, as "free space" is the side channel for leaking information about the existence, or lack of existence, of certain data.

Why is your RustDoc so Shitty?

Unfortunately, rustdoc can't document binaries, and so the only documentation you'll see generated are for the "frontend" library portions, which are the API calls you would use to talk to the PDDB. These are deliberately uninteresting, as we've gone through great effort to make the bindings are "what you expect" (principle of least surprise).

However, you're probably looking to fix a PDDB bug, audit the code, or generally figure out what the hell is going on. This means you want to look at the PDDB as a "binary" and not a "library" -- something RustDoc can't help you with. As the issue above notes, the fallback is for you to consult this README file, and literally, read the source (or rather, the paragraphs of plaintext documentation we've embedded in the source files, waiting for the day when the rustdoc issue is fixed and these can be turned into something more user-friendly).