linux-kernel - Re: [patch v2] epoll use a single inode ...

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Message-ID: <Pine.LNX.4.64.0703051558070.3998@woody.linux-foundation.org>
Date:	Mon, 5 Mar 2007 16:00:58 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Davide Libenzi <davidel@...ilserver.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [patch v2] epoll use a single inode ...



On Mon, 5 Mar 2007, Davide Libenzi wrote:
> @@ -763,15 +767,17 @@
>  	 * using the inode number.
>  	 */
>  	error = -ENOMEM;
> -	sprintf(name, "[%lu]", inode->i_ino);
>  	this.name = name;
> -	this.len = strlen(name);
> -	this.hash = inode->i_ino;
> +	this.len = sprintf(name, "[%p]", ep);
> +	this.hash = 0;

Please don't expose kernel pointers to user space.

It's much better to do something like

	static unsigned int epoll_inode;

	this.len = sprintf(name, "[%u]", ++epoll_inode);

if you just need some pseudo-unique name to distinguish two epoll things 
from each other (vs from a dup'ed fd).

		Linus
-
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