linux-kernel - Re: [RFC][PATCH 3/6] SLIM main patch

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Date:	Fri, 28 Jul 2006 12:05:31 -0700
From:	Kylene Jo Hall <kjhall@...ibm.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	LSM ML <linux-security-module@...r.kernel.org>,
	Dave Safford <safford@...ibm.com>,
	Mimi Zohar <zohar@...ibm.com>, Serge Hallyn <sergeh@...ibm.com>
Subject: Re: [RFC][PATCH 3/6] SLIM main patch

On Fri, 2006-07-28 at 06:01 +0000, Pavel Machek wrote:
> Hi!
> 
> > SLIM is an LSM module which provides an enhanced low water-mark
> > integrity and high water-mark secrecy mandatory access control
> > model.
> 
> Still no Documentation/ changes. Uses // comments to comment out code.
> 
We'll add a description similar to what was in the Patch 3 email to file
slim.txt in Documentation and make sure to remove all // comments in the
next release.

> > +static char *get_token(char *buf_start, char *buf_end, char delimiter,
> > +		       int *token_len)
> > +{
> > +	char *bufp = buf_start;
> > +	char *token = NULL;
> > +
> > +	while (!token && (bufp < buf_end)) {	/* Get start of token */
> > +		switch (*bufp) {
> > +		case ' ':
> > +		case '\n':
> > +		case '\t':
> > +			bufp++;
> > +			break;
> > +		case '#':
> > +			while ((*bufp != '\n') && (bufp++ < buf_end)) ;
> > +			bufp++;
> > +			break;
> > +		default:
> > +			token = bufp;
> > +			break;
> > +		}
> > +	}
> > +	if (!token)
> > +		return NULL;
> > +
> > +	*token_len = 0;
> > +	while ((*token_len == 0) && (bufp <= buf_end)) {
> > +		if ((*bufp == delimiter) || (*bufp == '\n'))
> > +			*token_len = bufp - token;
> > +		if (bufp == buf_end)
> > +			*token_len = bufp - token;
> > +		bufp++;
> > +	}
> > +	if (*token_len == 0)
> > +		token = NULL;
> > +	return token;
> > +}
> 
> What are these tokens and why do we want to play with strings in
> kernel?
> 
The xattrs must be parsed.  They are strings for portability and
readability.  SELinux does this as well.  Note: we are in the process of
removing the time stuff from the xattr for the next release for this
reason as well.

Thanks,
Kylie

> 							Pavel
> 

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