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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id w204-v6sm9113773wmw.17.2018.07.06.07.57.37 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 06 Jul 2018 07:57:37 -0700 (PDT) Date: Fri, 6 Jul 2018 16:57:35 +0200 From: Ingo Molnar To: Josh Poimboeuf Cc: Alexey Dobriyan , Borislav Petkov , linux-crypto@vger.kernel.org, Mike Galbraith , 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 , Herbert Xu , Peter Zijlstra Subject: Re: [PATCH] x86/crypto: Add missing RETs Message-ID: <20180706145735.GA7100@gmail.com> References: <1529289279.31745.3.camel@gmx.de> <20180623103622.GA2760@zn.tnic> <20180624071105.GA29407@gmail.com> <20180624104449.GA20159@avx2> <20180625072438.GA19063@gmail.com> <20180625131932.sge43esxdb5ejoxg@treble> <20180626064930.GB25879@gmail.com> <20180626123154.unjji5glpokedwal@treble> <20180705075815.GA20903@gmail.com> <20180706140643.u2vau63nncg23hmi@treble> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180706140643.u2vau63nncg23hmi@treble> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Josh Poimboeuf 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