linux-kernel - Re: [PATCH v7 0/6] x86/fpu: Allow PKRU to be (once again) written by ptrace

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Date:   Wed, 16 Nov 2022 15:31:12 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Kyle Huey <me@...ehuey.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Robert O'Callahan <robert@...llahan.org>,
        David Manouchehri <david.manouchehri@...eup.net>
Subject: Re: [PATCH v7 0/6] x86/fpu: Allow PKRU to be (once again) written by
 ptrace

On 11/15/22 15:09, Kyle Huey wrote:
> Following last week's discussion I've reorganized this patch. The goal
> remains to restore the pre-5.14 behavior of ptrace(PTRACE_SET_REGSET,
> NT_X86_XSTATE) for the PKRU register (which was equivalent to a hardware
> XRSTOR instruction).

The new version looks great.  I've applied it.

I did remove the stable@ tags for now.  There were a couple reasons for
that.  First, most of the x86 stuff marked for stable@ goes via our
tip/urgent branch and this doesn't seem super urgent.  It also touches
code that's exposed in at least three separate UABIs, so I want a bit
more soak time than x86/urgent normally provides.

I have zero objections if anyone wants to submit it to stable@ after it
hits Linus's tree.