linux-kernel - Re: [PATCH 0/8] Security: Provide unioned file support

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Date:	Fri, 19 Jun 2015 09:52:55 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	David Howells <dhowells@...hat.com>, sds@...ho.nsa.gov,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-security-module@...r.kernel.org,
	"linux-unionfs@...r.kernel.org" <linux-unionfs@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/8] Security: Provide unioned file support

On Fri, Jun 19, 2015 at 9:20 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Thu, Jun 18, 2015 at 02:32:15PM +0100, David Howells wrote:
>>
>> The attached patches provide security support for unioned files where the
>> security involves an object-label-based LSM (such as SELinux) rather than a
>> path-based LSM.
>>
>> The patches can be broken down into a number of sets:
>>
>>  (1) A small patch to drop a lock earlier in overlayfs.  The main VFS patch
>>      touches the same code, so I put this first.
>>
>>  (2) The main VFS patch that makes an open file struct referring to a union
>>      file have ->f_path point to the union/overlay file whilst ->f_inode and
>>      ->f_mapping refer to the subordinate file that does the actual work.
>
> #1 and #2 applied, will be in tomorrow vfs.git#for-next

Brave.

What's going to happen to all those f_path.dentry uses where the
filesystem thinks it's getting its own dentry?

> git grep f_path.dentry | wc -l
171

Thanks,
Miklos
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