linux-kernel - Re: [PATCH] detour TTY driver

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Message-ID: <20100529225908.GQ31073@ZenIV.linux.org.uk>
Date:	Sat, 29 May 2010 23:59:08 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Samo Pogacnik <samo_pogacnik@....net>,
	linux-embedded <linux-embedded@...r.kernel.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH] detour TTY driver

On Sat, May 29, 2010 at 11:54:02PM +0100, Alan Cox wrote:
> > +	/* re-register our fops write function */
> > +	detour_fops.write = detour_write;
> > +
> > +	detour_file.f_dentry = &detour_dentry;
> > +	detour_file.f_dentry->d_inode = &detour_inode;
> > +	detour_file.f_op = &detour_fops;
> > +	detour_file.f_mode |= FMODE_WRITE;
> > +	security_file_alloc(&detour_file);
> > +	INIT_LIST_HEAD(&detour_file.f_u.fu_list);
> > +
> > +	detour_inode.i_rdev = MKDEV(TTYAUX_MAJOR, 3);
> > +	security_inode_alloc(&detour_inode);
> > +	INIT_LIST_HEAD(&detour_inode.inotify_watches);
> > +
> > +	ret = detour_fops.open(&detour_inode, &detour_file);
> > +	printk(KERN_INFO "detour_fops.open() returned %ld\n", ret);
> > +	ret = detour_fops.unlocked_ioctl(&detour_file, TIOCCONS, 0);
> > +	printk(KERN_INFO "detour_fops.ioctl() returned %ld\n", ret);

That alone is enough for a NAK.  Do Not Do That.  Fake struct file/dentry/inode
and their uses are not acceptable.  Neither is modifying file_operations,
while we are at it.
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