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Subject: Re: [PATCH v1 21/22] LSM: Multiple concurrent major security
 modules
To:     Casey Schaufler <casey@schaufler-ca.com>,
        LSM <linux-security-module@vger.kernel.org>,
        LKLM <linux-kernel@vger.kernel.org>,
        Paul Moore <paul@paul-moore.com>,
        Stephen Smalley <sds@tycho.nsa.gov>,
        SE Linux <selinux@tycho.nsa.gov>,
        "SMACK-discuss@lists.01.org" <SMACK-discuss@lists.01.org>,
        John Johansen <john.johansen@canonical.com>,
        Kees Cook <keescook@chromium.org>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        James Morris <jmorris@namei.org>
Cc:     "Schaufler, Casey" <casey.schaufler@intel.com>
Newsgroups: gmane.linux.kernel,gmane.linux.kernel.lsm,gmane.comp.security.selinux
From:   Piotr Sawicki <p.sawicki2@partner.samsung.com>
Date:   Tue, 9 Oct 2018 16:09:41 +0200
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On 07/16/2018 08:24 PM, Casey Schaufler wrote:
> LSM: Multiple concurrent major security modules

> diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h
> index c0d7ea0bf5b6..db72f2e38311 100644
> --- a/include/uapi/linux/prctl.h
> +++ b/include/uapi/linux/prctl.h
> @@ -219,4 +219,8 @@ struct prctl_mm_map {
>  # define PR_SPEC_DISABLE		(1UL << 2)
>  # define PR_SPEC_FORCE_DISABLE		(1UL << 3)
>  
> +/* Control the LSM specific peer information */
> +#define	PR_GET_DISPLAY_LSM	52
> +#define	PR_SET_DISPLAY_LSM	53
> +
>  #endif /* _LINUX_PRCTL_H */

Hi,

The above two numbers for prctl() options have been reserved by
PR_GET_SPECULATION_CTRL and PR_SET_SPECULATION_CTRL.

Take a look at this commit: "prctl: Add speculation control prctls"

Regards,
Piotr