linux-kernel - Re: [PATCH v4 03/15] binfmt: Introduce secureexec flag

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Date:   Mon, 31 Jul 2017 17:23:31 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        David Howells <dhowells@...hat.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        John Johansen <john.johansen@...onical.com>,
        "Serge E. Hallyn" <serge@...lyn.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>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 03/15] binfmt: Introduce secureexec flag

On Mon, Jul 31, 2017 at 4:51 PM, Kees Cook <keescook@...omium.org> wrote:
> diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
> index 3cd98e8bc9dc..6cfd36a27d4e 100644
> --- a/include/linux/binfmts.h
> +++ b/include/linux/binfmts.h
> @@ -34,6 +34,12 @@ struct linux_binprm {
>                 cap_effective:1;/* true if has elevated effective capabilities,
>                                  * false if not; except for init which inherits
>                                  * its parent's caps anyway */
> +               /*
> +                * Set by bprm_set_creds hook to indicate a privilege-gaining
> +                * exec has happened. Used to sanitize execution environment
> +                * and to set AT_SECURE auxv for glibc.
> +                */
> +               secureexec:1;
>  #ifdef __alpha__
>         unsigned int taso:1;
>  #endif

Grrr. git rebase messed me up. (; vs , in variable list.) I will send
a v5 and double-check the per-patch builds. Bleh.

-Kees

-- 
Kees Cook
Pixel Security