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Message-ID: <28431b5d-c34c-a54b-acbf-70d1ae635e0d@infradead.org>
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
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