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Date:   Mon, 25 Jun 2018 09:24:38 +0200
From:   Ingo Molnar <mingo@kernel.org>
To:     Alexey Dobriyan <adobriyan@gmail.com>
Cc:     Borislav Petkov <bp@alien8.de>, linux-crypto@vger.kernel.org,
        Mike Galbraith <efault@gmx.de>, torvalds@linux-foundation.org,
        tglx@linutronix.de, jpoimboe@redhat.com, luto@kernel.org,
        peterz@infradead.org, brgerst@gmail.com, hpa@zytor.com,
        linux-kernel@vger.kernel.org, dvlasenk@redhat.com,
        h.peter.anvin@intel.com,
        linux-tip-commits <linux-tip-commits@vger.kernel.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH] x86/crypto: Add missing RETs
Message-ID: <20180625072438.GA19063@gmail.com>
References: <tip-51bad67ffbce0aaa44579f84ef5d05597054ec6a@git.kernel.org>
 <1529235613.4572.7.camel@gmx.de>
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 <1529242717.4472.3.camel@gmx.de>
 <1529244178.4674.1.camel@gmx.de>
 <20180617194747.GA21160@zn.tnic>
 <1529289279.31745.3.camel@gmx.de>
 <20180623103622.GA2760@zn.tnic>
 <20180624071105.GA29407@gmail.com>
 <20180624104449.GA20159@avx2>
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* Alexey Dobriyan <adobriyan@gmail.com> wrote:

> On Sun, Jun 24, 2018 at 09:11:05AM +0200, Ingo Molnar wrote:
> > > Add explicit RETs to the tail calls of AEGIS and MORUS crypto algorithms
> > > otherwise they run into INT3 padding due to
> > > 
> > >   51bad67ffbce ("x86/asm: Pad assembly functions with INT3 instructions")
> > > 
> > > leading to spurious debug exceptions.
> > > 
> > > Mike Galbraith <efault@gmx.de> took care of all the remaining callsites.
> > 
> > Note that 51bad67ffbce has been zapped because it caused too many problems like 
> > this, but the explicit RETs make sense nevertheless.
> 
> So commit which found real bug(s) was zapped.
> 
> OK

No, what happened is that the commit was first moved into WIP.x86/debug showing 
its work-in-progress status, because it was incomplete and caused bugs:

   https://lore.kernel.org/lkml/20180518073644.GA8593@gmail.com/T/#u

... and finally, after weeks of inaction I zapped it because I didn't see progress 
and you didn't answer my question.

If a fixed patch with updated tooling to detect these crashes before they occur on 
live systems is submitted we'll reconsider - it didn't get NAK-ed, it's just 
incomplete in the current form.

Thanks,

	Ingo