Date: Tue, 16 Apr 2019 08:51:05 -0700 From: Conrad Meyer <cem@freebsd.org> To: Warner Losh <imp@bsdimp.com> Cc: src-committers <src-committers@freebsd.org>, svn-src-all <svn-src-all@freebsd.org>, svn-src-head <svn-src-head@freebsd.org> Subject: Re: svn commit: r346250 - in head: share/man/man4 share/man/man9 sys/dev/random sys/kern sys/libkern sys/sys Message-ID: <CAG6CVpW_Tjz_mPmMPForKAO3gLhES63TtdNyZcg0pTkb3z%2BTRw@mail.gmail.com> In-Reply-To: <CANCZdfrNsBMqKrnqVzTNVNwCcHj5ZYrKhjss_%2Bp6i=rKqwYFNA@mail.gmail.com> References: <201904151840.x3FIeaEQ009242@repo.freebsd.org> <CAPyFy2D9NQQKwVx5MhCfasQ82x7C9s6mj5kXuDE1oogrQeoJ5A@mail.gmail.com> <CAHSQbTAfwYcLenBxg4ZB13P03S%2BTYEM1-xy3BYsSWJ49hBWLZA@mail.gmail.com> <CAG6CVpXwOhSpmCT1SShvEOZAdjbQSk5xSzk%2BLk8c5fMpnhSKQw@mail.gmail.com> <CAG6CVpUqy75_iEU-OwC21LOQFrXTO7rMz3B4iHi7GBTfsqK_5w@mail.gmail.com> <20190416150352.c604a280368ccb2992a861e8@bidouilliste.com> <CANCZdfqwfdPnr3HBAw6=YdPW_0yLsS4OpJMhiqFxWSM6BVJ-Zw@mail.gmail.com> <310a420ee0b9e12249979d89dc4fa0d4cac5a8dc.camel@freebsd.org> <CANCZdfrNsBMqKrnqVzTNVNwCcHj5ZYrKhjss_%2Bp6i=rKqwYFNA@mail.gmail.com>
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Hi Warner, On Tue, Apr 16, 2019 at 8:47 AM Warner Losh <imp@bsdimp.com> wrote: > On Tue, Apr 16, 2019 at 9:16 AM Ian Lepore <ian@freebsd.org> wrote: >> Isn't a file full of data which is distributed in identical form to >> everyone the exact opposite of entropy? Ian has the right idea. > It's just to bootstrap entropy for installs. The CI stuff doesn't matter = if that's the same since the CI images aren't exposed to the internet in an= y way that would make it matter. The normal install would have the same see= ds of entropy, but diverge from there fairly quickly. The stuff that's used= early in the install is the don't care sort of things that won't matter in= the installer (which then creates it's own entropy that's different for ev= ery install). I agree that it would be safe, although potentially misleading and potentially dangerous, to create a fake entropy file for the installer images. We need to be careful *not* to embed such files in .img files which are installed by 'dd' directly to a disk or flash or VM, for example. It would be catastrophic to distribute the same entropy file to all FreeBSD AWS images. Best, Conrad
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