linux-kernel - Re: [PATCH v5 02/12] S.A.R.A.: create framework

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Date:   Sat, 6 Jul 2019 08:29:22 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Salvatore Mesoraca <s.mesoraca16@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     kernel-hardening@...ts.openwall.com, linux-mm@...ck.org,
        linux-security-module@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Brad Spengler <spender@...ecurity.net>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Christoph Hellwig <hch@...radead.org>,
        James Morris <james.l.morris@...cle.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        PaX Team <pageexec@...email.hu>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v5 02/12] S.A.R.A.: create framework

Hi,

On 7/6/19 3:54 AM, Salvatore Mesoraca wrote:
> diff --git a/security/sara/Kconfig b/security/sara/Kconfig
> new file mode 100644
> index 0000000..0456220
> --- /dev/null
> +++ b/security/sara/Kconfig
> @@ -0,0 +1,40 @@
> +menuconfig SECURITY_SARA
> +	bool "S.A.R.A."
> +	depends on SECURITY
> +	select SECURITYFS
> +	default n

No need for "default n".  Drop it, please.

> +	help
> +	  This selects S.A.R.A. LSM which aims to collect heterogeneous
> +	  security measures providing a common interface to manage them.
> +	  This LSM will always be stacked with the selected primary LSM and
> +	  other stacked LSMs.
> +	  Further information can be found in
> +	  Documentation/admin-guide/LSM/SARA.rst.
> +
> +	  If unsure, answer N.
> +
> +config SECURITY_SARA_DEFAULT_DISABLED
> +	bool "S.A.R.A. will be disabled at boot."
> +	depends on SECURITY_SARA
> +	default n
> +	help
> +	  If you say Y here, S.A.R.A. will not be enabled at startup. You can
> +	  override this option at boot time via "sara.enabled=[1|0]" kernel
> +	  parameter or via user-space utilities.
> +	  This option is useful for distro kernels.
> +
> +	  If unsure, answer N.
> +
> +config SECURITY_SARA_NO_RUNTIME_ENABLE
> +	bool "S.A.R.A. can be turn on only at boot time."

	               can be turned on

> +	depends on SECURITY_SARA_DEFAULT_DISABLED
> +	default y
> +	help
> +	  By enabling this option it won't be possible to turn on S.A.R.A.
> +	  at runtime via user-space utilities. However it can still be
> +	  turned on at boot time via the "sara.enabled=1" kernel parameter.
> +	  This option is functionally equivalent to "sara.enabled=0" kernel
> +	  parameter. This option is useful for distro kernels.
> +
> +	  If unsure, answer Y.
> +


-- 
~Randy