linux-kernel - Re: [patch V3 12/66] x86/fpu: Reject invalid MXCSR values in copy_kernel_to

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Date:   Mon, 21 Jun 2021 12:00:55 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [patch V3 12/66] x86/fpu: Reject invalid MXCSR values in
 copy_kernel_to_xstate()

On Fri, Jun 18, 2021 at 04:18:35PM +0200, Thomas Gleixner wrote:
> Instead of masking out reserved bits, check them and reject the provided
> state as invalid if not zero.
> 
> Suggested-by: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
> V3: Validate MXCSR when FP|SSE|YMM are set. The quirk check is only
>     correct for the copy function.
> V2: New patch
> ---
>  arch/x86/kernel/fpu/xstate.c |   19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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