linux-kernel - Re: [linux-cifs-client] [RFC PATCH] CIFS posix acl permission checking

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Date:	Thu, 4 Mar 2010 09:33:45 -0800
From:	Jeremy Allison <jra@...ba.org>
To:	simo <idra@...ba.org>
Cc:	Jon Severinsson <jon@...erinsson.net>,
	linux-fsdevel@...r.kernel.org, linux-cifs-client@...ts.samba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-cifs-client] [RFC PATCH] CIFS posix acl permission
	checking

On Thu, Mar 04, 2010 at 10:51:53AM -0500, simo wrote:
> 
> Letting a different user access the mount point *is* a security
> violation in itself. The CIFS security model lies in per user sessions.
> The right way to fix the problem is multi-session mounts. Allowing a
> different user to use a user session is a violation of the security
> model of CIFS.

Multi-session mounts are the only sane fix. This is what Windows
does in their redirectory (when a process with different credentials
traverses into a mount point a new sessionsetup is done to get remote
credentials).

Jeremy.
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