linux-kernel - Re: [patch 05/41] x86/fpu: Limit xstate copy size in xstateregs

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Date:   Fri, 11 Jun 2021 21:37:28 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     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>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [patch 05/41] x86/fpu: Limit xstate copy size in xstateregs_set()

On Fri, Jun 11 2021 at 11:37, Andy Lutomirski wrote:
> On 6/11/21 9:15 AM, Thomas Gleixner wrote:
>> If the count argument is larger than the xstate size, this will happily
>> copy beyond the end of xstate.
>
> Reviewed-by: Andy Lutomirski <luto@...nel.org>
>
> This interface is horrible.  Oh well.

It's ptrace is must be horrible :)