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Wed, 17 Apr 2019 16:05:54 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from smtp.freebsd.org (smtp.freebsd.org [96.47.72.83]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 9A25686276; Wed, 17 Apr 2019 16:05:54 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from John-Baldwins-MacBook-Pro-3.local (ralph.baldwin.cx [66.234.199.215]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) (Authenticated sender: jhb) by smtp.freebsd.org (Postfix) with ESMTPSA id 009571E6B0; Wed, 17 Apr 2019 16:05:53 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Subject: Re: svn commit: r346250 - in head: share/man/man4 share/man/man9 sys/dev/random sys/kern sys/libkern sys/sys To: cem@freebsd.org Cc: src-committers , svn-src-all , svn-src-head References: <201904162251.x3GMp2aF097103@gndrsh.dnsmgr.net> <4d6b8a14-b053-9ed1-14b2-bbc359ac9413@FreeBSD.org> From: John Baldwin Openpgp: preference=signencrypt Autocrypt: addr=jhb@FreeBSD.org; 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Intel Mac OS X 10.12; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk X-Loop: FreeBSD.org Sender: owner-src-committers@freebsd.org X-Rspamd-Queue-Id: 3918586280 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-6.98 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.98)[-0.984,0]; REPLY(-4.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0] Status: O X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Date: Tue, 03 Sep 2019 14:07:54 -0000 X-Original-Date: Wed, 17 Apr 2019 09:05:52 -0700 X-List-Received-Date: Tue, 03 Sep 2019 14:07:54 -0000 On 4/16/19 4:48 PM, Conrad Meyer wrote: > On Tue, Apr 16, 2019 at 4:31 PM John Baldwin wrote: >> bhyveload is effectively the loader in this case. It runs the normal loader >> scripts and logic and so would load the guests's /boot/entropy and pass it >> to the guest kernel as metadata just like the regular loader. > > Right, except it doesn't seem to do things like nuke /boot/nextboot.conf :-(. It just needs a disk write method I think for that to work, but I'm not sure that's currently in the userboot interface. >> In addition, bhyve also supports virtio-rng which is another way to provide >> entropy to guest OS's. That's why in my reply I focused on qemu for mips >> (or riscv) as for x86 hypervisors there are existing, somewhat-standarized >> solutions for the hypervisor to provide entropy to the guest. > > Perhaps cryptographically random stack-protector cookies are simply > inappropriate for MIPS or RISCV. Do we have any other examples of > kernel random consumers blocking after that immediate hiccup is > overcome? There may be MIPS and RISCV designs that do have suitable entropy available (especially I would expect future RISCV designs to have them), so I think blacklisting stack protector wholesale on those architectures is overboard. I think some sort of off-by-default knob (even a compile option) is fine for people who need fast and loose vs safe as you already agreed to earlier. Also, for development testing we still want coverage of using stack cookies on MIPS and RISCV even if the simulator environment gives not-very-strong cookie values. -- John Baldwin