bugtraq - Re: hard links on Linux create local DoS vulnerability and security problems

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Message-ID: <Pine.LNX.4.58.0311241354310.10019@shishi.roaringpenguin.com>
Date: Mon, 24 Nov 2003 13:57:12 -0500 (EST)
From: "David F. Skoll" <dfs@...ringpenguin.com>
To: Bruno Lustosa <bruno@...tosa.net>
Cc: bugtraq@...urityfocus.com
Subject: Re: hard links on Linux create local DoS vulnerability and security
 problems

On Mon, 24 Nov 2003, Bruno Lustosa wrote:

> Just checked this on 2.6.0-test9, and it will not work.

[Keeping SUID bits by making a hard link.]

This is true even on ancient version of Linux and UNIX.

A hard link just contains a name and an inode number.  The permissions
are stored in the inode, so all hard links share the same permissions,
owner, etc.

--
David.