linux-kernel - Re: [PATCH] ima: use full pathnames in measurement list

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Date:	Mon, 25 Jun 2012 06:45:48 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	James Morris <jmorris@...ei.org>
Cc:	linux-security-module <linux-security-module@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ima: use full pathnames in measurement list

On Mon, 2012-06-25 at 12:29 +1000, James Morris wrote:
> On Fri, 22 Jun 2012, Mimi Zohar wrote:
> 
> > The IMA measurement list contains filename hints, which can be
> > ambigious without the full pathname.  This patch replaces the
> > filename hint with the full pathname, simplifying for userspace
> > the correlating of file hash measurements with files.
> > 
> > Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
> 
> Are you posting this for review or do you want it applied to my tree?

It was posted for review, but both are good.

thanks,

Mimi 

> > ---
> >  security/integrity/ima/ima_main.c |   40 +++++++++++++++++++++++++++++++-----
> >  1 files changed, 34 insertions(+), 6 deletions(-)
> > 
> > diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> > index b17be79..91fa323 100644
> > --- a/security/integrity/ima/ima_main.c
> > +++ b/security/integrity/ima/ima_main.c
> > @@ -54,6 +54,7 @@ static void ima_rdwr_violation_check(struct file *file)
> >  	fmode_t mode = file->f_mode;
> >  	int rc;
> >  	bool send_tomtou = false, send_writers = false;
> > +	unsigned char *pathname = NULL, *pathbuf = NULL;
> >  
> >  	if (!S_ISREG(inode->i_mode) || !ima_initialized)
> >  		return;
> > @@ -75,12 +76,25 @@ static void ima_rdwr_violation_check(struct file *file)
> >  out:
> >  	mutex_unlock(&inode->i_mutex);
> >  
> > +	if (!send_tomtou && !send_writers)
> > +		return;
> > +
> > +	/* We will allow 11 spaces for ' (deleted)' to be appended */
> > +	pathbuf = kmalloc(PATH_MAX + 11, GFP_KERNEL);
> > +	if (pathbuf) {
> > +		pathname = d_path(&file->f_path, pathbuf, PATH_MAX + 11);
> > +		if (IS_ERR(pathname))
> > +			pathname = NULL;
> > +	}
> >  	if (send_tomtou)
> > -		ima_add_violation(inode, dentry->d_name.name, "invalid_pcr",
> > -				  "ToMToU");
> > +		ima_add_violation(inode,
> > +				  !pathname ? dentry->d_name.name : pathname,
> > +				  "invalid_pcr", "ToMToU");
> >  	if (send_writers)
> > -		ima_add_violation(inode, dentry->d_name.name, "invalid_pcr",
> > -				  "open_writers");
> > +		ima_add_violation(inode,
> > +				  !pathname ? dentry->d_name.name : pathname,
> > +				  "invalid_pcr", "open_writers");
> > +	kfree(pathbuf);
> >  }
> >  
> >  static void ima_check_last_writer(struct integrity_iint_cache *iint,
> > @@ -123,6 +137,7 @@ static int process_measurement(struct file *file, const unsigned char *filename,
> >  {
> >  	struct inode *inode = file->f_dentry->d_inode;
> >  	struct integrity_iint_cache *iint;
> > +	unsigned char *pathname = NULL, *pathbuf = NULL;
> >  	int rc = 0;
> >  
> >  	if (!ima_initialized || !S_ISREG(inode->i_mode))
> > @@ -147,8 +162,21 @@ retry:
> >  		goto out;
> >  
> >  	rc = ima_collect_measurement(iint, file);
> > -	if (!rc)
> > -		ima_store_measurement(iint, file, filename);
> > +	if (rc != 0)
> > +		goto out;
> > +
> > +	if (function != BPRM_CHECK) {
> > +		/* We will allow 11 spaces for ' (deleted)' to be appended */
> > +		pathbuf = kmalloc(PATH_MAX + 11, GFP_KERNEL);
> > +		if (pathbuf) {
> > +			pathname =
> > +			    d_path(&file->f_path, pathbuf, PATH_MAX + 11);
> > +			if (IS_ERR(pathname))
> > +				pathname = NULL;
> > +		}
> > +	}
> > +	ima_store_measurement(iint, file, !pathname ? filename : pathname);
> > +	kfree(pathbuf);
> >  out:
> >  	mutex_unlock(&iint->mutex);
> >  	return rc;
> > -- 
> > 1.7.7.6
> > 
> > 
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-security-module" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > 
> 


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