linux-kernel - Re: [PATCH 1/2] arch: consolidate CONFIG_STRICT

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Message-ID: <20151123101944.GA32300@e104818-lin.cambridge.arm.com>
Date:	Mon, 23 Nov 2015 10:19:45 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Arnd Bergmann <arnd@...db.de>, linux-nvdimm@...ts.01.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Will Deacon <will.deacon@....com>,
	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] arch: consolidate CONFIG_STRICT_DEVM in
 lib/Kconfig.debug

On Sat, Nov 21, 2015 at 07:57:02PM -0800, Dan Williams wrote:
> diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug
> index 04fb73b973f1..e13c4bf84d9e 100644
> --- a/arch/arm64/Kconfig.debug
> +++ b/arch/arm64/Kconfig.debug
> @@ -14,20 +14,6 @@ config ARM64_PTDUMP
>  	  kernel.
>  	  If in doubt, say "N"
>  
> -config STRICT_DEVMEM
> -	bool "Filter access to /dev/mem"
> -	depends on MMU
> -	help
> -	  If this option is disabled, you allow userspace (root) access to all
> -	  of memory, including kernel and userspace memory. Accidental
> -	  access to this is obviously disastrous, but specific access can
> -	  be used by people debugging the kernel.
> -
> -	  If this option is switched on, the /dev/mem file only allows
> -	  userspace access to memory mapped peripherals.
> -
> -	  If in doubt, say Y.
> -
>  config PID_IN_CONTEXTIDR
>  	bool "Write the current PID to the CONTEXTIDR register"
>  	help

For arm64:

Acked-by: Catalin Marinas <catalin.marinas@....com>
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