linux-kernel - Re: [TOMOYO #13 (mmotm 2008-11-19-02-19) 01/11] Introduce security_path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 01 Dec 2008 15:00:12 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kentaro Takeda <takedakn@...data.co.jp>,
	Toshiharu Harada <haradats@...data.co.jp>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@....de>,
	Crispin Cowan <crispin@...spincowan.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	James Morris <jmorris@...ei.org>
Subject: Re: [TOMOYO #13 (mmotm 2008-11-19-02-19) 01/11] Introduce
	security_path_clear() hook.

On Thu, 2008-11-20 at 20:25 +0900, Tetsuo Handa wrote:
> plain text document attachment (introduce-security_path_clear.patch)
> To perform DAC performed in vfs_foo() before MAC, we let security_path_foo()
> save a result into our own hash table and return 0, and let security_inode_foo()
> return the saved result. Since security_inode_foo() is not always called after
> security_path_foo(), we need security_path_clear() to clear the hash table.

This seems very fragile and unmaintainable to me.  The fact that you
even need a security_path_clear() hook suggests that something is wrong
with the other security_path* hooks. I'd suggest that you explicitly
pass the result of the security_path* hooks down to the security_inode*
hooks instead.  What do others think?

-- 
Stephen Smalley
National Security Agency

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/