linux-kernel - Re: [PATCH v5 08/12] S.A.R.A.: trampoline emulation

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Date:   Sat, 6 Jul 2019 08:31:58 -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 08/12] S.A.R.A.: trampoline emulation

On 7/6/19 3:54 AM, Salvatore Mesoraca wrote:
> diff --git a/security/sara/Kconfig b/security/sara/Kconfig
> index 54a96e0..458e0e8 100644
> --- a/security/sara/Kconfig
> +++ b/security/sara/Kconfig
> @@ -117,6 +117,24 @@ choice
>  		  Documentation/admin-guide/LSM/SARA.rst.
>  endchoice
>  
> +config SECURITY_SARA_WXPROT_EMUTRAMP
> +	bool "Enable emulation for some types of trampolines"
> +	depends on SECURITY_SARA_WXPROT
> +	depends on ARCH_HAS_LSM_PAGEFAULT
> +	depends on X86
> +	default y
> +	help
> +	  Some programs and libraries need to execute special small code
> +	  snippets from non-executable memory pages.
> +	  Most notable examples are the GCC and libffi trampolines.
> +	  This features make it possible to execute those trampolines even

	  This feature makes it possible

> +	  if they reside in non-executable memory pages.
> +	  This features need to be enabled on a per-executable basis

	  This feature needs to be

> +	  via user-space utilities.
> +	  See Documentation/admin-guide/LSM/SARA.rst. for further information.
> +
> +	  If unsure, answer y.
> +
>  config SECURITY_SARA_WXPROT_DISABLED
>  	bool "WX protection will be disabled at boot."
>  	depends on SECURITY_SARA_WXPROT


-- 
~Randy