linux-kernel - Re: [PATCH] x86/crypto: Add missing RETs

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Date:   Fri, 6 Jul 2018 16:57:35 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Borislav Petkov <bp@...en8.de>, linux-crypto@...r.kernel.org,
        Mike Galbraith <efault@....de>, torvalds@...ux-foundation.org,
        tglx@...utronix.de, luto@...nel.org, peterz@...radead.org,
        brgerst@...il.com, hpa@...or.com, linux-kernel@...r.kernel.org,
        dvlasenk@...hat.com, h.peter.anvin@...el.com,
        linux-tip-commits <linux-tip-commits@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] x86/crypto: Add missing RETs


* Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> > Great, I'd be perfectly fine with such an approach.
> > 
> > Also, if we have that then we could re-apply Alexey's patch and switch to INT3 
> > (only on 64-bit kernels) without any trouble, because objtool should detect any 
> > execution flow bugs before the INT3 could trigger, right?
> > 
> > I.e. any INT3 fault would show a combination of *both* an objtool bug and a 
> > probable code flow bug - which I suspect would warrant crashing the box ...
> 
> Sounds good to me.  I can take Alexey's patch and submit a 64-bit
> version of it, along with the relevant objtool changes (though it may
> still be a few weeks before I get the chance).

Sounds good to me, thanks!

	Ingo