linux-kernel - Re: [PATCH v3 07/15] commoncap: Move cap_elevated calculation into bprm_set

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Message-ID: <alpine.LRH.2.20.1707191928090.10539@namei.org>
Date:   Wed, 19 Jul 2017 19:28:31 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     Kees Cook <keescook@...omium.org>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Serge Hallyn <serge@...lyn.com>,
        Andy Lutomirski <luto@...nel.org>,
        David Howells <dhowells@...hat.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        John Johansen <john.johansen@...onical.com>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        James Morris <james.l.morris@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 07/15] commoncap: Move cap_elevated calculation into
 bprm_set_creds

On Tue, 18 Jul 2017, Kees Cook wrote:

> Instead of a separate function, open-code the cap_elevated test, which
> lets us entirely remove bprm->cap_effective (to use the local "effective"
> variable instead), and more accurately examine euid/egid changes via the
> existing local "is_setid".
> 
> Cc: Serge Hallyn <serge@...lyn.com>
> Cc: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Kees Cook <keescook@...omium.org>


Reviewed-by: James Morris <james.l.morris@...cle.com>


-- 
James Morris
<jmorris@...ei.org>