linux-kernel - Re: [PATCH 3/4] watch_queue: Implement mount topology and attribute change notifications

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <2189056.1595620785@warthog.procyon.org.uk>
Date:   Fri, 24 Jul 2020 20:59:45 +0100
From:   David Howells <dhowells@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Ian Kent <raven@...maw.net>,
        Christian Brauner <christian@...uner.io>,
        Jeff Layton <jlayton@...hat.com>, Karel Zak <kzak@...hat.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] watch_queue: Implement mount topology and attribute change notifications

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> So now you can basically allocate as much kernel memory as you want as
> a regular user, as long as you have a mounted directory you can walk
> (ie everybody).
> 
> Is there any limiting of watches anywhere? I don't see it.

That's a good point.  Any suggestions on how to do it?  An additional RLIMIT?

Or should I do it like I did with keyrings and separately manage a quota for
each user?

David