netdev - Re: [PATCH 3/3][RFC] SELinux: don't check permissions for kernel mounts

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Date:	Fri, 19 Dec 2008 07:52:51 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	James Morris <jmorris@...ei.org>
Cc:	linux-security-module@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Miller <davem@...emloft.net>, auke-jan.h.kok@...el.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	Eric Paris <eparis@...isplace.org>,
	Al Viro <viro@....linux.org.uk>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 3/3][RFC] SELinux: don't check permissions for kernel
 mounts

On Fri, 2008-12-19 at 12:07 +1100, James Morris wrote:
> Don't bother checking permissions when the kernel performs an internal 
> mount, as this should always be allowed.
> 
> Signed-off-by: James Morris <jmorris@...ei.org>

Acked-by:  Stephen Smalley <sds@...ho.nsa.gov>

> ---
>  security/selinux/hooks.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 3897758..4a44903 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -2461,6 +2461,10 @@ static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
>  	if (rc)
>  		return rc;
>  
> +	/* Allow all mounts performed by the kernel */
> +	if (flags & MS_KERNMOUNT)
> +		return 0;
> +
>  	AVC_AUDIT_DATA_INIT(&ad, FS);
>  	ad.u.fs.path.dentry = sb->s_root;
>  	return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
-- 
Stephen Smalley
National Security Agency

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