linux-kernel - Re: [PATCH 1/3] x86/hyperv: allocate the hypercall page with only read and execute bits

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Message-ID: <20200618114729.bnut7gbj2j4uhjnc@liuwe-devbox-debian-v2>
Date:   Thu, 18 Jun 2020 11:47:29 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dexuan Cui <decui@...rosoft.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Jessica Yu <jeyu@...nel.org>,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-mm@...ck.org, Wei Liu <wei.liu@...nel.org>
Subject: Re: [PATCH 1/3] x86/hyperv: allocate the hypercall page with only
 read and execute bits

On Thu, Jun 18, 2020 at 08:43:05AM +0200, Christoph Hellwig wrote:
> Avoid a W^X violation cause by the fact that PAGE_KERNEL_EXEC includes the
> writable bit.
> 
> For this resurrect the removed PAGE_KERNEL_RX definitіon, but as
> PAGE_KERNEL_ROX to match arm64 and powerpc.
> 
> Fixes: 78bb17f76edc ("x86/hyperv: use vmalloc_exec for the hypercall page")
> Reported-by: Dexuan Cui <decui@...rosoft.com>
> Signed-off-by: Christoph Hellwig <hch@....de>
> Tested-by: Vitaly Kuznetsov <vkuznets@...hat.com>

Acked-by: Wei Liu <wei.liu@...nel.org>