linux-kernel - Re: [PATCH] selinux: make mls_compute

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Date:	Thu, 24 Jan 2008 15:46:19 -0500
From:	Joshua Brindle <method@...icmethod.com>
To:	Eamon Walsh <ewalsh@...ho.nsa.gov>
CC:	SELinux List <selinux@...ho.nsa.gov>, linux-kernel@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	Stephen Smalley <sds@...ho.nsa.gov>
Subject: Re: [PATCH] selinux: make mls_compute_sid always polyinstantiate

Eamon Walsh wrote:
> This patch removes the requirement that the new and related object 
> types differ in order to polyinstantiate by MLS level.  This allows 
> MLS polyinstantiation to occur in the absence of explicit type_member 
> rules or when the type has not changed.
>
> Potential users of this support include pam_namespace.so (directory 
> polyinstantiation) and the SELinux X support (property 
> polyinstantiation).
>
> Signed-off-by: Eamon Walsh <ewalsh@...ho.nsa.gov>
> ---
>
> mls.c |   11 ++---------
> 1 file changed, 2 insertions(+), 9 deletions(-)
>
>
> diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c
> index fb5d70a..3bbcb53 100644
> --- a/security/selinux/ss/mls.c
> +++ b/security/selinux/ss/mls.c
> @@ -537,15 +537,8 @@ int mls_compute_sid(struct context *scontext,
>             /* Use the process effective MLS attributes. */
>             return mls_context_cpy_low(newcontext, scontext);
>     case AVTAB_MEMBER:
> -        /* Only polyinstantiate the MLS attributes if
> -           the type is being polyinstantiated */
> -        if (newcontext->type != tcontext->type) {
> -            /* Use the process effective MLS attributes. */
> -            return mls_context_cpy_low(newcontext, scontext);
> -        } else {
> -            /* Use the related object MLS attributes. */
> -            return mls_context_cpy(newcontext, tcontext);
> -        }
> +        /* Use the process effective MLS attributes. */
> +        return mls_context_cpy_low(newcontext, scontext);
>     default:
>         return -EINVAL;
>     }

Should there be a patch to update mls.c in libsepol as well? I hope we 
are keeping the kss and uss in sync.

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