From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH v3 35/75] x86/head/64: Build k/head64.c with
 -fno-stack-protector
Date: Wed, 3 Jun 2020 17:18:57 +0200
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To: Brian Gerst <brgerst@gmail.com>
Cc: the arch/x86 maintainers <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>, Peter Zijlstra <peterz@infradead.org>, Thomas Hellstrom <thellstrom@vmware.com>, Jiri Slaby <jslaby@suse.cz>, Dan Williams <dan.j.williams@intel.com>, Tom Lendacky <thomas.lendacky@amd.com>, Juergen Gross <jgross@suse.com>, Kees Cook <keescook@chromium.org>, David Rientjes <rientjes@google.com>, Cfir Cohen <cfir@google.com>, Erdem Aktas <erdemaktas@google.com>, Masami Hiramatsu <mhiramat@kernel.org>, Mike Stunes <mstunes@vmware.com>, Joerg Roedel <jroedel@suse.de>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, kvm list <kvm@vger.kernel.org>, Linux Virtualization <virtual>
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On Tue, May 19, 2020 at 09:58:18AM -0400, Brian Gerst wrote:
> On Tue, Apr 28, 2020 at 11:28 AM Joerg Roedel <joro@8bytes.org> wrote:

> The proper fix would be to initialize MSR_GS_BASE earlier.

That'll mean to initialize it two times during boot, as the first C
function with stack-protection is called before the kernel switches to
its high addresses (early_idt_setup call-path). But okay, I can do that.

On the other side, which value does the stack protector have in the early
boot code?


	Joerg