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Message-ID: <20170125135124.GA20896@amd>
Date: Wed, 25 Jan 2017 14:51:24 +0100
From: Pavel Machek <pavel@....cz>
To: Laura Abbott <labbott@...hat.com>
Cc: 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>,
Heiko Carstens <heiko.carstens@...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>,
Mark Rutland <mark.rutland@....com>, 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
Subject: Re: [PATCH 1/2] security: Change name of CONFIG_DEBUG_RODATA
On Wed 2017-01-25 12:21:05, Laura Abbott wrote:
> On 01/19/2017 08:53 AM, Pavel Machek wrote:
> >On Wed 2017-01-18 17:29:05, Laura Abbott wrote:
> >>
> >>Despite the word 'debug' in CONFIG_DEBUG_RODATA, this kernel option
> >>provides key security features that are to be expected on a modern
> >>system. Change the name to CONFIG_HARDENED_PAGE_MAPPINGS which more
> >>accurately describes what this option is intended to do.
> >
> >I think this is bad change. CONFIG_DEBUG_RODATA is describing what it
> >does, CONFIG_HARDENED_PAGE_MAPPINGS is advertising.
> >
> >We don't do advertising, and we don't force people to re-answer the
> >config questions without good reason.
> >
> >CONFIG_HARDENED_RODATA might fix the first problem, but not the second
> >one.
> >
> > Pavel
> >
>
> (Apologies, my SMTP was set up incorrectly so my response didn't
> actually get sent out)
>
> CONFIG_DEBUG_RODATA isn't describing what it does though. It misses
> that this config may handle much more than just rodata. I think
> Mark Rutland's suggestion of STRICT_KERNEL_RWX might be more
> descriptive.
CONFIG_BUG=y
CONFIG_LBDAF=y
CONFIG_PM_OPP=y
..it is config option. It is not description of the feature. People
are living with that config option for a while. I'd keep it.
Maybe you can go from CONFIG_DEBUG_RODATA to CONFIG_RODATA... (but
you'll still have people re-answer config option.)
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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