linux-kernel - Re: [PATCH 0/3] Add O_DENY* flags to fcntl and cifs

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: <20121207213520.05dd5a3b@pyramind.ukuu.org.uk>
Date:	Fri, 7 Dec 2012 21:35:20 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Pavel Shilovsky <piastry@...rsoft.ru>
Cc:	Christoph Hellwig <hch@...radead.org>,
	<linux-cifs@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-fsdevel@...r.kernel.org>, <wine-devel@...ehq.org>,
	<linux-nfs@...r.kernel.org>
Subject: Re: [PATCH 0/3] Add O_DENY* flags to fcntl and cifs

> The problem is the possibility of denial-of-service attacks here. We 
> can try to prevent them by:
> 1) specifying an extra security bit on the file that indicates that 
> share flags are accepted (like we have for mandatory locks now) and 
> setting it for neccessary files only, or
> 2) adding a special mount option (but it it probably makes sense if we 
> decided to add this support for CIFS and NFS only).

3) making it a property that the process opts into - the same fs can have
Linux and wine users at once.

But for such a big set of changes and with the kind of potential fallout
you need to demonstrate a good practical use case IMHO, not just a "neat
idea I had".

Alan
--
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/