linux-kernel - Re: [PATCH v2] x86/hyperv: Remove hv_vtl_early

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Message-ID: <ZQ3gBk8fbHLo7Gl6@liuwe-devbox-debian-v2>
Date:   Fri, 22 Sep 2023 18:42:14 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, mikelley@...rosoft.com,
        minipli@...ecurity.net, ssengar@...rosoft.com
Subject: Re: [PATCH v2] x86/hyperv: Remove hv_vtl_early_init initcall

On Thu, Sep 21, 2023 at 09:58:40PM -0700, Saurabh Sengar wrote:
> There has been cases reported where HYPERV_VTL_MODE is enabled by mistake,
> on a non Hyper-V platforms. This causes the hv_vtl_early_init function to
> be called in an non Hyper-V/VTL platforms which results the memory
> corruption.
> 
> Remove the early_initcall for hv_vtl_early_init and call it at the end of
> hyperv_init to make sure it is never called in a non Hyper-V platform by
> mistake.
> 
> Reported-by: Mathias Krause <minipli@...ecurity.net>
> Closes: https://lore.kernel.org/lkml/40467722-f4ab-19a5-4989-308225b1f9f0@grsecurity.net/
> Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> Acked-by: Mathias Krause <minipli@...ecurity.net>

Applied to hyperv-fixes. Thanks.