linux-kernel - Re: [PATCH V2 1/1] ecryptfs: call vfs_setxattr() in ecryptfs

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Date:	Wed, 6 Oct 2010 09:42:39 +1100 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Roberto Sassu <roberto.sassu@...ito.it>
cc:	tyhicks@...ux.vnet.ibm.com, kirkland@...onical.com,
	akpm@...ux-foundation.org, linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/1] ecryptfs: call vfs_setxattr() in
 ecryptfs_setxattr()

On Tue, 5 Oct 2010, Roberto Sassu wrote:

> Ecryptfs is a stackable filesystem which relies on lower filesystems the
> ability of setting/getting extended attributes.
> 
> If there is a security module enabled on the system it updates the
> 'security' field of inodes according to the owned extended attribute set
> with the function vfs_setxattr().  When this function is performed on a
> ecryptfs filesystem the 'security' field is not updated for the lower
> filesystem since the call security_inode_post_setxattr() is missing for
> the lower inode.
> Further, the call security_inode_setxattr() is missing for the lower inode,
> leading to policy violations in the security module because specific
> checks for this hook are not performed (i. e. filesystem 
> 'associate' permission on SELinux is not checked for the lower filesystem).
> 
> This patch replaces the call of the setxattr() method of the lower inode
> in the function ecryptfs_setxattr() with vfs_setxattr().
> 
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
> Reviewed-by: Tyler Hicks <tyhicks@...ux.vnet.ibm.com>

Acked-by: James Morris <jmorris@...ei.org>

-- 
James Morris
<jmorris@...ei.org>
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