Rust does not allow a `fn`-pointer to be null. This fixes that, while
luckily doing it in a way that leaves system calls
backwards-compatible :)

Ptrace memory reading and floating point registers support

See merge request !104

Since even a very basic ptrace can be nice to have, I thought I would split
the, perhaps rather big, ptrace project up in multiple PRs to make as few
changes as necessary in each. This PR contains the initial registry modifying
bits and only a very basic security measure. Letting this out to the community
should be good for spotting bugs and maybe getting some hype ;)

This reverts merge request !103

Bare-bones ptracing functionality

See merge request !103

jD91mZM2 authored 5 years ago and Jeremy Soller committed 5 years ago

I'm guessing it's some issue after a rebase or something...

Switch to 2018 edition

See merge request !102

Most of this was generated by the absolutely extraordinary `cargo fix`
subcommand. There were still 2 errors and a few warnings to patch up,
but compared to the normal 600+ errors, I'd say the fixer did a damn
good job! I'm also amazed that I could still start the VM after this,
I half expected some kinds of runtime failure...

Fix dropping grants without unmapping if they have no file descriptor (such as those from anonymous maps)