linux-kernel - Re: Boot regression with bacf6b499e11 ("x86/mm: Use a struct to reduce parameters for SME PGD mapping") on top of -rc8

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CA+55aFy3Agx5ngYERyJZhLkgA1oP1e48VY4hPw0H5Yopw_GdGA@mail.gmail.com>
Date:   Fri, 19 Jan 2018 18:38:44 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Brijesh Singh <brijesh.singh@....com>, X86 ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Boot regression with bacf6b499e11 ("x86/mm: Use a struct to
 reduce parameters for SME PGD mapping") on top of -rc8

On Fri, Jan 19, 2018 at 5:23 PM, Laura Abbott <labbott@...hat.com> wrote:
>
> Fedora got multiple reports of an early bootup crash post -rc8.
> Bisection showed bacf6b499e11 ("x86/mm: Use a struct to reduce
> parameters for SME PGD mapping") . It doesn't revert cleanly
> but if I revert the few other changes in arch/x86/mm/mem_encrypt.c
> as well it boots up fine.

Odd. I've tried to read through that patch three times to find
anything it actually changes, and I can't find anything.

It looks like that patch should have absolutely no actual behavioral impact.

But clearly I'm missing something. Can anybody see what the mistake in
the conversion is?

             Linus