linux-kernel - Re: [PATCH] x86/fpu/signal: save_xstate

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Date:   Thu, 23 Sep 2021 18:49:24 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Anders Roxell <anders.roxell@...aro.org>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Remi Duraffort <remi.duraffort@...aro.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        andrew.cooper3@...rix.com,
        "kernelci-results@...ups.io" <kernelci-results@...ups.io>
Subject: Re: [PATCH] x86/fpu/signal: save_xstate_epilog: fix return polarity

On 22/09/2021 21:09, Anders Roxell wrote:
> Fix the missing return code polarity in function 'save_xstate_epilog()'.
> 
> Reported-by: Remi Duraffort <remi.duraffort@...aro.org>
> Fixes: a2a8fd9a3efd ("x86/fpu/signal: Change return code of restore_fpregs_from_user() to boolean")
> Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1461
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> Cc: andrew.cooper3@...rix.com
> ---
>  arch/x86/kernel/fpu/signal.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
> index 68f03da2012e..39c7bae97daf 100644
> --- a/arch/x86/kernel/fpu/signal.c
> +++ b/arch/x86/kernel/fpu/signal.c
> @@ -106,7 +106,7 @@ static inline bool save_xstate_epilog(void __user *buf, int ia32_frame)
>  	err = __copy_to_user(&x->i387.sw_reserved, sw_bytes, sizeof(*sw_bytes));
>  
>  	if (!use_xsave())
> -		return err;
> +		return !err;
>  
>  	err |= __put_user(FP_XSTATE_MAGIC2,
>  			  (__u32 __user *)(buf + fpu_user_xstate_size));
> 

This patch has probably been applied already, but since the issue
got bisected and then the fix was verified by KernelCI:

Tested-by: "kernelci.org bot" <bot@...nelci.org>


For the record, see more details about it here:

  https://github.com/kernelci/kernelci-project/issues/53

Best wishes,
Guillaume