linux-kernel - Re: [PATCH -v8 -rc3] Security: Introduce security= boot parameter

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Message-ID: <Xine.LNX.4.64.0803070159280.8501@us.intercode.com.au>
Date:	Fri, 7 Mar 2008 02:03:10 +1100 (EST)
From:	James Morris <jmorris@...ei.org>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>
cc:	Chris Wright <chrisw@...s-sol.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Eric Paris <eparis@...isplace.org>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Paul Moore <paul.moore@...com>,
	Alexey Dobriyan <adobriyan@...ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	LSM-ML <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH -v8 -rc3] Security: Introduce security= boot parameter

On Thu, 6 Mar 2008, Ahmed S. Darwish wrote:

> Would you mind answering my confusions below so I can do the change
> with good understanding ?
> 
> I see preempt_disable() before calling security and vfs_caches init,
> but what will prevent two processors/cores from executing
> security_module_enable() concurrently (thus possibly corrupting
> chosen_lsm) ?
> security_module_enable() is also now used in __init init_smk_fs().
> 
> Or the init path got executed serially ?

The init phase only runs on one cpu, see the lock_kernel() in 
kernel_init(), from which context the initcalls are eventually run in 
sequence.


- James
-- 
James Morris
<jmorris@...ei.org>
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