linux-kernel - Re: gcc-10: kernel stack is corrupted and fails to boot

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Message-ID: <20200513225108.GA2317231@rani.riverdale.lan>
Date:   Wed, 13 May 2020 18:51:08 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Borislav Petkov <bp@...e.de>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: gcc-10: kernel stack is corrupted and fails to boot

On Thu, May 14, 2020 at 12:20:38AM +0200, Borislav Petkov wrote:
> On Wed, May 13, 2020 at 11:49:49PM +0200, Arnd Bergmann wrote:
> > Right, in particular since Linus started building with gcc-10 already and
> > would likely soon run into that problem if he hasn't already ;-)
> 
> Oh noo, we don't want Linus' kernel broken. ;-)
> 
> We will send him the fix this weekend.
> 
> Looking at that branch:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=x86/build
> 
> I think we can send the whole thing even.
> 
> Linus, shout if you'd prefer only the last three commits there:
> 
> 950a37078aa0 x86/build: Use $(CONFIG_SHELL)
> f670269a42bf x86: Fix early boot crash on gcc-10, next try
> 73da86741e7f x86/build: Check whether the compiler is sane
> 
> but the other three from Masahiro are simple cleanups:
> 
> 675a59b7dec6 x86/boot/build: Add phony targets in arch/x86/boot/Makefile to PHONY
> 30ce434e44d7 x86/boot/build: Make 'make bzlilo' not depend on vmlinux or $(obj)/bzImage
> e3c7c1052271 x86/boot/build: Add cpustr.h to targets and remove clean-files
> 
> which should be ok to take now too AFAICT.
> 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg

I notice that doesn't add it to start_kernel (init/main.c). That's not
currently affected, but I think we should it add for consistency and
future-proofing, at least for 5.8?