linux-kernel - Re: [PATCH][Rebased for 5.16] x86/fpu/xstate: Fix the ARCH_REQ_XCOMP

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Date:   Mon, 11 Apr 2022 15:28:49 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "Chang S. Bae" <chang.seok.bae@...el.com>
Cc:     stable@...r.kernel.org, yang.zhong@...el.com, bonzini@....org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][Rebased for 5.16] x86/fpu/xstate: Fix the
 ARCH_REQ_XCOMP_PERM implementation

On Tue, Apr 05, 2022 at 04:04:56AM -0700, Chang S. Bae wrote:
> From: Yang Zhong <yang.zhong@...el.com>
> 
> This is backport for 5.16
> 
> Upstream commit 063452fd94d153d4eb38ad58f210f3d37a09cca4
> 
> ARCH_REQ_XCOMP_PERM is supposed to add the requested feature to the
> permission bitmap of thread_group_leader()->fpu. But the code overwrites
> the bitmap with the requested feature bit only rather than adding it.
> 
> Fix the code to add the requested feature bit to the master bitmask.
> 
> Fixes: db8268df0983 ("x86/arch_prctl: Add controls for dynamic XSTATE components")
> Signed-off-by: Yang Zhong <yang.zhong@...el.com>
> Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Paolo Bonzini <bonzini@....org>
> Cc: stable@...r.kernel.org
> Link: https://lore.kernel.org/r/20220129173647.27981-2-chang.seok.bae@intel.com
> [chang: Backport for 5.16]
> Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
> ---
>  arch/x86/kernel/fpu/xstate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Now queued up, thanks.

greg k-h