linux-kernel - Re: [PATCHv2] arm64: Fix R/O permissions in mark_rodata

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Message-ID: <20151118121450.GF27495@e104818-lin.cambridge.arm.com>
Date:	Wed, 18 Nov 2015 12:14:50 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Laura Abbott <labbott@...oraproject.org>
Cc:	Will Deacon <will.deacon@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv2] arm64: Fix R/O permissions in mark_rodata_ro

On Thu, Nov 12, 2015 at 12:21:10PM -0800, Laura Abbott wrote:
> The permissions in mark_rodata_ro trigger a build error
> with STRICT_MM_TYPECHECKS. Fix this by introducing
> PAGE_KERNEL_ROX for the same reasons as PAGE_KERNEL_RO.
> From Ard:
> 
> "PAGE_KERNEL_EXEC has PTE_WRITE set as well, making the range
> writeable under the ARMv8.1 DBM feature, that manages the
> dirty bit in hardware (writing to a page with the PTE_RDONLY
> and PTE_WRITE bits both set will clear the PTE_RDONLY bit in that case)"
> 
> Signed-off-by: Laura Abbott <labbott@...oraproject.org>

Applied. Thanks.

-- 
Catalin
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