linux-kernel - Re: [PATCH 3/5] sysctl: Fix the selinux_sysctl_get

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Message-Id: <1171023889.11912.348.camel@moss-spartans.epoch.ncsc.mil>
Date:	Fri, 09 Feb 2007 07:24:49 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	selinux@...ho.nsa.gov, James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 3/5] sysctl:  Fix the selinux_sysctl_get_sid

On Thu, 2007-02-08 at 15:55 -0700, Eric W. Biederman wrote:
> I goofed and when reenabling the fine grained selinux labels for
> sysctls and forgot to add the "/sys" prefix before consulting
> the policy database.  When computing the same path using
> proc_dir_entries we got the "/sys" for free as it was part
> of the tree, but it isn't true for clt_table trees.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>

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

> ---
>  security/selinux/hooks.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 47fb937..de16b9f 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -1445,6 +1445,12 @@ static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid)
>  		path = end;
>  		table = table->parent;
>  	}
> +	buflen -= 4;
> +	if (buflen < 0)
> +		goto out_free;
> +	end -= 4;
> +	memcpy(end, "/sys", 4);
> +	path = end;
>  	rc = security_genfs_sid("proc", path, tclass, sid);
>  out_free:
>  	free_page((unsigned long)buffer);
-- 
Stephen Smalley
National Security Agency

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