linux-kernel - Re: [PATCH 2/2] security: Change name of CONFIG_DEBUG_SET_MODULE

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Date:   Thu, 19 Jan 2017 12:34:06 +0100
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Laura Abbott <labbott@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Jason Wessel <jason.wessel@...driver.com>,
        Jonathan Corbet <corbet@....net>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Rob Herring <robh@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Jessica Yu <jeyu@...hat.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-parisc@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-pm@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        "AKASHI, Takahiro" <takahiro.akashi@...aro.org>
Subject: Re: [PATCH 2/2] security: Change name of CONFIG_DEBUG_SET_MODULE_RONX

On Thu, Jan 19, 2017 at 11:11:18AM +0000, Mark Rutland wrote:
> > +config HARDENED_MODULE_MAPPINGS
> > +	bool "Mark module mappings with stricter permissions (RO/W^X)"
> > +	default y
> > +	depends on ARCH_HAS_HARDENED_MODULE_MAPPINGS
> > +	help
> > +	  If this is set, module text and rodata memory will be made read-only,
> > +	  and non-text memory will be made non-executable. This provides
> > +	  protection against certain security vulnerabilities (e.g. modifying
> > +	  code)
> > +
> > +	  Unless your system has known restrictions or performance issues, it
> > +	  is recommended to say Y here.
> > +
> 
> I was hoping that we'd make this mandatory, as we'd already done for
> DEBUG_RODATA.

Same for s390: would be good to make this mandatory.