linux-kernel - Re: [PATCH] overlayfs: Warn on copy up if a process has a R/O fd open to the lower file

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: <17649.1433952771@warthog.procyon.org.uk>
Date:	Wed, 10 Jun 2015 17:12:51 +0100
From:	David Howells <dhowells@...hat.com>
To:	Colin Walters <walters@...bum.org>
Cc:	dhowells@...hat.com, miklos@...redi.hu, viro@...IV.linux.org.uk,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-unionfs@...r.kernel.org
Subject: Re: [PATCH] overlayfs: Warn on copy up if a process has a R/O fd open to the lower file

Colin Walters <walters@...bum.org> wrote:

> On Thu, May 28, 2015, at 02:46 PM, David Howells wrote:
> > Print a warning when overlayfs copies up a file if the process that
> > triggered the copy up has a R/O fd open to the lower file being copied up.
> 
> Why not an option to make it an error?  If one's goal is to use overlayfs
> without apps potentially corrupting data, better to fail fast.

That could be added.  Note that doing this isn't *necessarily* wrong though.

David
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/