linux-kernel - Re: [TOMOYO #9 (2.6.27-rc7-mm1) 1/6] LSM adapter functions.

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Message-ID: <20081003130937.GF9651@us.ibm.com>
Date:	Fri, 3 Oct 2008 08:09:37 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Kentaro Takeda <takedakn@...data.co.jp>
Cc:	Valdis.Kletnieks@...edu, Casey Schaufler <casey@...aufler-ca.com>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, haradats@...data.co.jp,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [TOMOYO #9 (2.6.27-rc7-mm1) 1/6] LSM adapter functions.

Quoting Kentaro Takeda (takedakn@...data.co.jp):
> Serge E. Hallyn wrote:
> > Just keep your own hash table.
> I see, then we want one more LSM hook for clearing the hash table 
> after returing from vfs_*().
> 
> foo() {
> 	error = security_path_foo(); /* save result in the hash table */
> 	error = vfs_foo(); /* fetch from the hash table in security_inode_*() */
> 	security_path_clear(); /* clear the hash table */
> }
> 
> Is it acceptable?

Why can't you just clear the value during security_inode_foo()?

Note I'm seeing this as a way for Tomoyo to temporarily (maybe) work
around the mis-placement of the security_path_foo() hooks.  I don't want
to add security_path_clear() hooks to "legitimize" the workaround.  I'd
rather Tomoyo and Apparmor folks keep looking for a better way to get
real DAC-before-MAC.

> Regards,
> 
> 
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