Re: [PATCH 1/3] proc: Stop reporting eip and esp in /proc/PID/stat

From: Jann Horn
Date: Sat Oct 01 2016 - 06:37:45 EST

On Fri, Sep 30, 2016 at 07:01:13PM -0700, Andy Lutomirski wrote:
> On an unrelated note, can we please lock down all the silly historical
> *userspace* info leaks in /proc? Nasty ones include: net, cmdline (at
> the very least, only argv[0] should be visible if the reader lacks
> ptrace access).
> Less nasty ones include: limits, sched, autogroup, comm, wchan,
> schedstat, cpuset, cgroup, oom_*, sessionid, coredump_filter

If that doesn't break stuff, I'm very much in favor of it.

> uid_map, gid_map, etc are just screwed up. They should be per
> *namespace* somewhere, and they should require creds on the namespace.

What do you have in mind? Something like
with jumped fake symlinks to the directory and its entries in /proc/$pid/?

> timerslack is totally fscked up -- it allows ugo to write and it
> checks the wrong creds. Jann, does your series fix that?

Nope. Never noticed that thing so far, probably because it was only
added a few months ago. :/ Will add it to my series.

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