linux-kernel - Re: [RFC][Patch 2/6] integrity: fs hook placement

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Date:	Thu, 08 Mar 2007 13:45:42 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Dmitriy Monakhov <dmonakhov@...ru>
Cc:	linux-kernel@...r.kernel.org, safford@...son.ibm.com,
	serue@...ux.vnet.ibm.com, kjhall@...ux.vnet.ibm.com,
	zohar@...ibm.com
Subject: Re: [RFC][Patch 2/6] integrity: fs hook placement

On Thu, 2007-03-08 at 21:16 +0300, Dmitriy Monakhov wrote:
> Mimi Zohar <zohar@...ux.vnet.ibm.com> writes:
> 
> > This patch places calls to the new integrity hooks in the appropriate
> > places in the fs directory. It is not meant in any way to be viewed
> > as a complete set, but used as a basis for an initial discussion.
> >
> > Index: linux-2.6.21-rc3-mm2/fs/ext3/xattr_security.c
> > ===================================================================
> > --- linux-2.6.21-rc3-mm2.orig/fs/ext3/xattr_security.c
> > +++ linux-2.6.21-rc3-mm2/fs/ext3/xattr_security.c
> > @@ -10,6 +10,7 @@
> >  #include <linux/ext3_jbd.h>
> >  #include <linux/ext3_fs.h>
> >  #include <linux/security.h>
> > +#include <linux/integrity.h>
> >  #include "xattr.h"
> >  
> >  static size_t
> > @@ -58,12 +59,19 @@ ext3_init_security(handle_t *handle, str
> >  
> >  	err = security_inode_init_security(inode, dir, &name, &value, &len);
> >  	if (err) {
> > +		/* Even if creation of the security xattr fails, must
> > +		 * indicate this is a new inode. */
> > +		integrity_inode_init_integrity(inode, dir, NULL, NULL, NULL);
> >  		if (err == -EOPNOTSUPP)
> >  			return 0;
> >  		return err;
> >  	}
> <<<< block begin
> >  	err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
> >  				    name, value, len, 0);
> > +
> > +	integrity_inode_init_integrity(inode, dir, &name, &value, &len);
> > +	err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
> > +				    name, value, len, 0);
> <<<< block end
> May be i've missed something, but i don't get last block.
> Why you call ext3_xattr_set_handle() twise?, 
> or you just mistyped and  it has to look like this:
> <<<<block_begin

Both security_inode_init_security and integrity_inode_init_integrity
create extended attributes. The first ext3_xattr_set_handle creates the
security extended attribute and the second one creates the integrity
extended attribute.  In the case of EVM, EVM calculates an HMAC on a set
of extended attributes, possibly including the initial security extended
attribute.

Mimi Zohar

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