linux-kernel - Re: [PATCH] [RFC][WIP] namespace.c: Allow some unprivileged proc mounts when not fully visible

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Date:   Wed, 4 Apr 2018 20:49:09 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     ebiederm@...ssion.com
Cc:     alban.crequy@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC][WIP] namespace.c: Allow some unprivileged proc
 mounts when not fully visible

> The only option I have seen proposed that might qualify as something
> general purpose and simple is a new filesystem that is just the process
> directories of proc.

While "mount -t pid" and "mount -t sysctl" are decades overdue, I don't
think they cover everything.

IIRC some gcc versions read /proc/meminfo on every invocation. Now
imagine such program doesn't have a fallback if /proc/ doesn't exist
(how many thousands such programs are there?) So user is going to ask
for /proc with just /proc/meminfo only. At this point it is back to
nearly full /proc.