linux-kernel - Re: [patch 2/4] permission mapping for sys

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Date:	Mon, 13 Nov 2006 10:25:18 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Zack Weinberg <zackw@...ix.com>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	Stephen Smalley <sds@...ho.nsa.gov>, jmorris@...ei.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/4] permission mapping for sys_syslog operations

On Sun, 2006-11-12 at 22:40 -0800, Zack Weinberg wrote:
> plain text document attachment (map_perms.diff)
> As suggested by Stephen Smalley: map the various sys_syslog operations
> to a smaller set of privilege codes before calling security modules.
> This patch changes the security module interface!  There should be no
> change in the actual security semantics enforced by dummy, capability,
> nor SELinux (with one exception, clearly marked in sys_syslog).
> 
> zw
> 
> 
> Index: linux-2.6/include/linux/klog.h
> ===================================================================
> --- linux-2.6.orig/include/linux/klog.h	2006-11-10 13:48:52.000000000 -0800
> +++ linux-2.6/include/linux/klog.h	2006-11-10 14:08:57.000000000 -0800
> @@ -23,4 +23,16 @@
>  	KLOG_GET_SIZE        = 10  /* return size of log buffer */
>  };
>  
> +#ifdef __KERNEL__
> +
> +/*
> + * Constants passed by do_syslog to security_syslog to indicate which
> + * privilege is requested.
> + */
> +#define KLOGSEC_READ	  0  /* read current messages (klogd) */
> +#define KLOGSEC_READHIST  1  /* read message history (dmesg) */
> +#define KLOGSEC_CLEARHIST 2  /* clear message history (dmesg -c) */
> +#define KLOGSEC_CONSOLE   3  /* set console log level */
> +
> +#endif /* __KERNEL__ */

Hi,

you had such a nice userspace/kernel shared header.. and now you mix it
with kernel privates again... can you consider making this a second
header? Eg have a pure userspace clean header and a separate for-kernel
header (which #can include the user header for all I care)... that's
nicer for sure!

Greetings,
   Arjan van de Ven

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