linux-kernel - Re: [PATCH 31/34] vfs: syscall: Add fspick() to select a superblock for reconfiguration [ver #12]

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: <15867.1539791153@warthog.procyon.org.uk>
Date:   Wed, 17 Oct 2018 16:45:53 +0100
From:   David Howells <dhowells@...hat.com>
To:     Alan Jenkins <alan.christopher.jenkins@...il.com>
Cc:     dhowells@...hat.com, Al Viro <viro@...IV.linux.org.uk>,
        linux-api@...r.kernel.org, torvalds@...ux-foundation.org,
        ebiederm@...ssion.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, mszeredi@...hat.com
Subject: Re: [PATCH 31/34] vfs: syscall: Add fspick() to select a superblock for reconfiguration [ver #12]

Alan Jenkins <alan.christopher.jenkins@...il.com> wrote:

> I agree.  I'm happy to see this is using the same check as do_remount().
> 
> 
> * change filesystem flags. dir should be a physical root of filesystem.
> * If you've mounted a non-root directory somewhere and want to do remount
> * on it - tough luck.
> */

Are you suggesting that it should only work at the ultimate root of a
superblock and not a bind mount somewhere within?

That's tricky to make work for NFS because s_root is a dummy dentry.

David