netdev - Re: [PATCH 1/3][RFC] SELinux: correctly detect proc filesystems of the form "proc/foo"

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Date:	Fri, 19 Dec 2008 07:29:33 -0500
From:	"David P. Quigley" <dpquigl@...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>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Al Viro <viro@....linux.org.uk>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 1/3][RFC] SELinux: correctly detect proc filesystems of
	the form "proc/foo"

On Fri, 2008-12-19 at 12:05 +1100, James Morris wrote:
> From: Stephen Smalley <sds@...ho.nsa.gov>
> 
> Map all of these proc/ filesystem types to "proc" for the policy lookup at
> filesystem mount time.
> 
> Signed-off-by: James Morris <jmorris@...ei.org>
> ---
>  security/selinux/hooks.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index d337748..470763a 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -672,7 +672,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
>  		sbsec->proc = 1;
>  
>  	/* Determine the labeling behavior to use for this filesystem type. */
> -	rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
> +	rc = security_fs_use(sbsec->proc ? "proc" : sb->s_type->name, &sbsec->behavior, &sbsec->sid);
>  	if (rc) {
>  		printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
>  		       __func__, sb->s_type->name, rc);

I'm  not sure if you took the patches I sent out for condensing the
flags and adding a /proc/mount notification for label support but if you
did then your patches haven't been updated to use them. sbsec->proc
should no longer exist and instead it should be sbsec->flags &
SE_SBPROC.

Dave

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