linux-kernel - Re: Remaining randconfig objtool warnings, linux-next-20200428

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Date:   Tue, 28 Apr 2020 12:11:48 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Peter Zijlstra <peterz@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Remaining randconfig objtool warnings, linux-next-20200428

On Tue, Apr 28, 2020 at 11:10:44AM -0500, Josh Poimboeuf wrote:
> On Tue, Apr 28, 2020 at 04:49:15PM +0200, Arnd Bergmann wrote:
> > I noticed the number of objtool warnings in randconfig kernels have gone down
> >  recently, maybe it's possible to eliminate the remaining ones?
> > 
> > Here are the ones I ran into recently, using gcc-9.3:
> > 
> > ==> build/x86/0x3D2B5D6D_defconfig/log <==
> > arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_handle_exit_irqoff()+0x24: unreachable instruction
> 
> This is a legit warning caused by CONFIG_UBSAN_TRAP +
> CONFIG_UBSAN_ALIGNMENT, I think Kees is going to do a fix.

Yup, I'm still on the hook for this; just a bit distracted. I'll get it
landed soon.

-- 
Kees Cook