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Message-Id: <20170119113406.GC5110@osiris>
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.
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