linux-kernel - Re: [patch] unprivileged mounts update

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Message-ID: <Pine.LNX.4.61.0704262107130.506@yvahk01.tjqt.qr>
Date:	Thu, 26 Apr 2007 21:10:04 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	serue@...ibm.com, viro@....linux.org.uk, linuxram@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [patch] unprivileged mounts update


On Apr 25 2007 11:21, Eric W. Biederman wrote:
>>
>> Why did we want to use fsuid, exactly?
>
>- Because ruid is completely the wrong thing we want mounts owned
>  by whomever's permissions we are using to perform the mount.

Think nfs. I access some nfs file as an unprivileged user. knfsd, by
nature, would run as euid=0, uid=0, but it needs fsuid=jengelh for
most permission logic to work as expected.


Jan
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