linux-kernel - Re: [PATCH 6/6] Integrity: IMA file free imbalance

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Date:	Mon, 02 Feb 2009 20:27:54 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Morris <jmorris@...ei.org>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	"<David Safford" <safford@...son.ibm.com>,
	Serge Hallyn <serue@...ibm.com>, Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH 6/6] Integrity: IMA file free imbalance

On Mon, 2009-02-02 at 17:47 -0600, Serge E. Hallyn wrote:
> Quoting Mimi Zohar (zohar@...ux.vnet.ibm.com):
> > The number of calls to ima_path_check()/ima_file_free()
> > should be balanced.  An extra call to fput(), indicates
> > the file could have been accessed without first being
> > measured.
> > 
> > Although f_count is incremented/decremented in places other
> > than fget/fput, like fget_light/fput_light and get_file, the
> > current task must already hold a file refcnt.  The call to
> > __fput() is delayed until the refcnt becomes 0, resulting
> > in ima_file_free() flagging any changes.
> > 
> > - add hook to increment opencount for IPC shared memory(SYSV)
> >   and shmat files
> > 
> > Signed-off-by: Mimi Zohar <zohar@...ibm.com>
> 
> ...
> 
> > diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> 
> ...
> 
> > +static void opencount_get(struct file *file)
> > +{
> > +	struct inode *inode = file->f_dentry->d_inode;
> > +	struct ima_iint_cache *iint;
> > +
> > +	if (!ima_initialized || !S_ISREG(inode->i_mode))
> > +		return;
> > +	iint = ima_iint_find_insert_get(inode);
> > +	mutex_lock(&iint->mutex);
> > +	if (iint)
> 
> Hey, I think you've got those two lines above mixed
> up a bit :)

yes, thanks!

> Very neat, though.
> 
> Acked-by: Serge Hallyn <serue@...ibm.com>
> 
> once that's fixed up.
> 
> thanks,
> -serge

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