linux-kernel - Re: [patch 2/8] allow unprivileged umount

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Message-ID: <4629C4F6.5070907@zytor.com>
Date:	Sat, 21 Apr 2007 01:01:58 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Miklos Szeredi <miklos@...redi.hu>, serue@...ibm.com,
	viro@....linux.org.uk, linuxram@...ibm.com, ebiederm@...ssion.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org
Subject: Re: [patch 2/8] allow unprivileged umount

Andrew Morton wrote:
> On Fri, 20 Apr 2007 12:25:34 +0200 Miklos Szeredi <miklos@...redi.hu> wrote:
> 
>> +static bool permit_umount(struct vfsmount *mnt, int flags)
>> +{
>>
>> ...
>>
>> +	return mnt->mnt_uid == current->uid;
>> +}
> 
> Yes, this seems very wrong.  I'd have thought that comparing user_struct*'s
> would get us a heck of a lot closer to being able to support aliasing of
> UIDs between different namespaces.
> 

Not to mention it should be fsuid, not uid.

	-hpa
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