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

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Message-ID: <45ECD3D4.5020305@zytor.com>
Date:	Mon, 05 Mar 2007 18:37:08 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Davide Libenzi <davidel@...ilserver.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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 ...

Davide Libenzi wrote:
> 
> Right now is using:
> 
> 	this.len = sprintf(name, "[%u.%d]", current->pid, fd);
> 
> That should be unique and not have the wraparound problem. Ack?
> 

NAK, very much NAK.

File descriptors aren't file structures, they're *pointers* to file 
structures.

It's perfectly possible -- downright common -- for a file descriptor to 
be inherited by another process, and then the pid is recycled -- collision.

	-hpa
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