linux-kernel - Re: [PATCH v2 1/2] capabilities: Ambient capabilities

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Date:	Fri, 15 May 2015 13:32:03 +0200
From:	Lukasz Pawelczyk <l.pawelczyk@...sung.com>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	Serge Hallyn <serge.hallyn@...ntu.com>,
	Andrew Morton <akpm@...uxfoundation.org>,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Ted Ts'o <tytso@....edu>,
	"Andrew G. Morgan" <morgan@...nel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Aaron Jones <aaronmdjones@...il.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Markku Savela <msa@...h.iki.fi>,
	Kees Cook <keescook@...omium.org>,
	Jonathan Corbet <corbet@....net>,
	Christoph Lameter <cl@...ux.com>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH v2 1/2] capabilities: Ambient capabilities

On czw, 2015-05-14 at 23:39 -0700, Andy Lutomirski wrote:
> @@ -696,10 +729,18 @@ static inline void cap_emulate_setxuid(struct cred *new, const struct cred *old)
>  	     uid_eq(old->suid, root_uid)) &&
>  	    (!uid_eq(new->uid, root_uid) &&
>  	     !uid_eq(new->euid, root_uid) &&
> -	     !uid_eq(new->suid, root_uid)) &&
> -	    !issecure(SECURE_KEEP_CAPS)) {
> -		cap_clear(new->cap_permitted);
> -		cap_clear(new->cap_effective);
> +	     !uid_eq(new->suid, root_uid))) {
> +		if (!issecure(SECURE_KEEP_CAPS)) {
> +			cap_clear(new->cap_permitted);
> +			cap_clear(new->cap_effective);
> +		}
> +
> +		/*
> +		 * Pre-ambient programs except setresuid to nonroot followed

I think you meant "expect". This typo changes the meaning of the
sentence.

> +		 * by exec to drop capabilities.  We should make sure that
> +		 * this remains the case.
> +		 */
> +		cap_clear(new->cap_ambient);
>  	}


-- 
Lukasz Pawelczyk


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