linux-kernel - Re: [PATCH] x86: Use __nostackprotect for sme_encrypt

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Message-ID: <20180121103644.GA8717@kroah.com>
Date:   Sun, 21 Jan 2018 11:36:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Gabriel C <nix.or.die@...il.com>,
        Laura Abbott <labbott@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Brijesh Singh <brijesh.singh@....com>, X86 ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] x86: Use __nostackprotect for sme_encrypt_kernel

On Sun, Jan 21, 2018 at 10:50:20AM +0100, Ingo Molnar wrote:
> 
> * Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> 
> > On Sat, Jan 20, 2018 at 08:16:31PM -0800, Linus Torvalds wrote:
> > > On Sat, Jan 20, 2018 at 5:49 PM, Gabriel C <nix.or.die@...il.com> wrote:
> > > >
> > > > Added stable to CC since the patch series this patch fixes
> > > > is in stable-queue.
> > > 
> > > Oh, it wasn't clear from the commit message. But I guess the "Fixes:"
> > > tag would have caught Greg's eye regardless.
> > 
> > Ugh, I am _so_ behind in looking at patches that only have a Fixes: tag
> > in it and not a "Cc: stable@" tag, due to the recent high-volume of the
> > latter.
> > 
> > But they will end up in a mbox that I need to dig out of eventually, but
> > it will take time, so if you know you want a patch in a stable release,
> > it's much easier to just use the "Cc: stable@" tag please.
> 
> Just to make it easier, please put this upstream fix into -stable:
> 
>   91cfc88c66bf: ("x86: Use __nostackprotect for sme_encrypt_kernel")

Thanks, now queued up.

> I believe all the prerequisite upstream commits are in -stable already:
> 
>  1303880179e6: x86/mm: Clean up register saving in the __enc_copy() assembly code
>  bacf6b499e11: x86/mm: Use a struct to reduce parameters for SME PGD mapping
>  2b5d00b6c2cd: x86/mm: Centralize PMD flags in sme_encrypt_kernel()
>  cc5f01e28d6c: x86/mm: Prepare sme_encrypt_kernel() for PAGE aligned encryption
>  107cd2532181: x86/mm: Encrypt the initrd earlier for BSP microcode update

Yes, those are all there already.

greg k-h