linux-kernel - Re: [PATCH resend] define convenient securebits masks for prctl users

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Date:	Thu, 29 Oct 2009 13:33:06 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"Andrew G. Morgan" <morgan@...nel.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Ulrich Drepper <drepper@...hat.com>, linux-api@...r.kernel.org,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH resend] define convenient securebits masks for prctl
 users

Hi Serge,

On Wed, 28 Oct 2009 09:02:36 -0500 "Serge E. Hallyn" <serue@...ibm.com> wrote:
>
> [ Are there any objections to exporting securebits.h?  If not,
> can this patch be pushed to linux-next? ]

I am not sure which tree this belongs in?  Maybe security-testing (James
cc'd)?

> diff --git a/include/linux/securebits.h b/include/linux/securebits.h
> index d2c5ed8..9ad109e 100644
> --- a/include/linux/securebits.h
> +++ b/include/linux/securebits.h
> @@ -1,6 +1,13 @@
>  #ifndef _LINUX_SECUREBITS_H
>  #define _LINUX_SECUREBITS_H 1
>  
> +/* Each securesetting is implemented using two bits. One bit specifies
> +   whether the setting is on or off. The other bit specify whether the
> +   setting is locked or not. A setting which is locked cannot be
> +   changed from user-level. */
> +#define issecure_mask(X)	(1 << (X))
> +#define issecure(X)		(issecure_mask(X) & current_cred_xxx(securebits))

You want this second define protected by ifdef __KERNEL__ ...

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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