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From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>,
	Borislav Petkov <bp@alien8.de>,
	linux-crypto@vger.kernel.org, Mike Galbraith <efault@gmx.de>,
	torvalds@linux-foundation.org, tglx@linutronix.de,
	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
Date: Mon, 25 Jun 2018 08:19:32 -0500	[thread overview]
Message-ID: <20180625131932.sge43esxdb5ejoxg@treble> (raw)
In-Reply-To: <20180625072438.GA19063@gmail.com>

On Mon, Jun 25, 2018 at 09:24:38AM +0200, Ingo Molnar wrote:
> 
> * 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.

Hm, what happened to the objtool patch to detect these at build time?
Did it not work?

  https://lore.kernel.org/lkml/20180517134934.eog2fgoby5azq5a7@treble

-- 
Josh

  reply	other threads:[~2018-06-25 13:19 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-07 21:37 [PATCH] x86: pad assembly functions with INT3 Alexey Dobriyan
2018-05-07 21:41 ` hpa
2018-05-09 16:55   ` Alexey Dobriyan
2018-05-09 19:28     ` H. Peter Anvin
2018-05-10 16:39 ` David Laight
2018-05-11 18:53   ` H. Peter Anvin
2018-05-14  9:04     ` David Laight
2018-05-14 11:05       ` hpa
2018-05-15  6:54         ` Ingo Molnar
2018-05-15  6:59           ` hpa
2018-05-14 12:53 ` [tip:x86/pti] x86/asm: Pad assembly functions with INT3 instructions tip-bot for Alexey Dobriyan
2018-06-17 11:40   ` Mike Galbraith
2018-06-17 12:00     ` Borislav Petkov
2018-06-17 13:38       ` Mike Galbraith
2018-06-17 14:02         ` Mike Galbraith
2018-06-17 19:47           ` Borislav Petkov
2018-06-18  2:34             ` Mike Galbraith
2018-06-23 10:36               ` [PATCH] x86/crypto: Add missing RETs Borislav Petkov
2018-06-23 17:30                 ` Ondrej Mosnáček
2018-06-24  7:11                 ` Ingo Molnar
2018-06-24  7:12                   ` Thomas Gleixner
2018-06-24 10:15                     ` Borislav Petkov
2018-06-24 10:44                   ` Alexey Dobriyan
2018-06-25  7:24                     ` Ingo Molnar
2018-06-25 13:19                       ` Josh Poimboeuf [this message]
2018-06-26  6:49                         ` Ingo Molnar
2018-06-26 12:31                           ` Josh Poimboeuf
2018-07-05  7:58                             ` Ingo Molnar
2018-07-06 14:06                               ` Josh Poimboeuf
2018-07-06 14:57                                 ` Ingo Molnar
2018-07-01 13:19                 ` Herbert Xu
2018-07-01 15:24                   ` Ondrej Mosnáček
2018-07-01 15:45                     ` Herbert Xu
2018-06-19 11:27         ` [tip:x86/pti] x86/asm: Pad assembly functions with INT3 instructions David Laight

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