Re: [PATCH] Filesystem linking protections

[Valdis . Kletnieks]

On Mon, 07 Feb 2005 19:57:06 +0100, Lorenzo =?ISO-8859-1?Q?Hern=E1ndez_?= =?ISO-8859-1?Q?Garc=EDa-Hierro?= said:

> This patch adds two checks to do_follow_link() and sys_link(), for
> prevent users to follow (untrusted) symlinks owned by other users in
> world-writable +t directories (i.e. /tmp), unless the owner of the
> symlink is the owner of the directory, users will also not be able to
> hardlink to files they do not own.

This should be done using the LSM framework.  That's what it's *THERE* for.
I've previously posted an LSM that does these checks (and a few others), it
should be in the archives.

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