linux-kernel - Re: [PATCH v6 5/5] sidechannel: Linux Security Module for sidechannel

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Message-ID: <35bac572-14cc-d7c3-f788-1120c7431fb4@infradead.org>
Date:   Mon, 5 Nov 2018 11:52:08 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Casey Schaufler <casey.schaufler@...el.com>,
        kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
        dave.hansen@...el.com, deneen.t.dock@...el.com,
        kristen@...ux.intel.com, arjan@...ux.intel.com
Subject: Re: [PATCH v6 5/5] sidechannel: Linux Security Module for sidechannel

Hi:

On 11/5/18 11:05 AM, Casey Schaufler wrote:
> diff --git a/security/sidechannel/Kconfig b/security/sidechannel/Kconfig
> new file mode 100644
> index 000000000000..653033027415
> --- /dev/null
> +++ b/security/sidechannel/Kconfig
> @@ -0,0 +1,13 @@
> +config SECURITY_SIDECHANNEL
> +	bool "Sidechannel attack safety extra checks"
> +	depends on SECURITY
> +	default n

Please drop the "default n" since it is already the default value.

> +	help
> +	  Look for a variety of cases where a side-channel attack
> +	  could potentially be exploited. Instruct the switching
> +	  code to use the indirect_branch_prediction_barrier in
> +	  cases where the passed task and the current task may be
> +	  at risk.
> +
> +          If you are unsure how to answer this question, answer N.

Use tab + 2 spaces to indent the line above.
> +

thanx.
-- 
~Randy