linux-kernel - Re: [AppArmor 35/45] Allow permission functions to tell between parent and leaf checks

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Message-Id: <1193401943.11953.3.camel@moss-spartans.epoch.ncsc.mil>
Date:	Fri, 26 Oct 2007 08:32:23 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	jjohansen@...e.de
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Andreas Gruenbacher <agruen@...e.de>
Subject: Re: [AppArmor 35/45] Allow permission functions to tell between
	parent and leaf checks

On Thu, 2007-10-25 at 23:40 -0700, jjohansen@...e.de wrote:
> plain text document attachment (parent-permission.diff)
> Set the LOOKUP_CONTINUE flag when checking parent permissions. This allows
> permission functions to tell between parent and leaf checks.
> 
> Signed-off-by: Andreas Gruenbacher <agruen@...e.de>
> Signed-off-by: John Johansen <jjohansen@...e.de>
> 
> ---
>  fs/namei.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -1472,6 +1472,10 @@ static int may_delete(struct inode *dir,
>  	BUG_ON(victim->d_parent->d_inode != dir);
>  	audit_inode_child(victim->d_name.name, victim, dir);
>  
> +#if 0
> +	if (nd)
> +		nd->flags |= LOOKUP_CONTINUE;
> +#endif

#if 0?

>  	error = permission(dir,MAY_WRITE | MAY_EXEC, NULL);
>  	if (error)
>  		return error;
> @@ -1509,6 +1513,8 @@ static inline int may_create(struct inod
>  		return -EEXIST;
>  	if (IS_DEADDIR(dir))
>  		return -ENOENT;
> +	if (nd)
> +		nd->flags |= LOOKUP_CONTINUE;
>  	return permission(dir,MAY_WRITE | MAY_EXEC, nd);
>  }
>  
> 
-- 
Stephen Smalley
National Security Agency

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