Date: Mon, 27 May 2019 19:23:28 -0700 From: Enji Cooper <yaneurabeya@gmail.com> To: Warner Losh <imp@bsdimp.com> Cc: Rainer Duffner <rainer@ultra-secure.de>, "Conrad E. Meyer" <cem@freebsd.org>, voidanix@420blaze.it, freebsd-current <freebsd-current@freebsd.org>, owner-freebsd-current@freebsd.org Subject: Re: Disabling COMPAT_FREEBSD4/5/6/7/9 as a default kernel option Message-ID: <24F2196F-A5A9-4BBA-B4D4-D6721B42A7C8@gmail.com> In-Reply-To: <CANCZdfp3ORMJ%2BW6EHswn4AHQWtsRk4wWRHmZO-nn5HEvFB-SYg@mail.gmail.com> References: <ff7bfe10b7953d066e0f087b8d422b89@420blaze.it> <eaaf7d3d03dbbee0bebd2769d25fcd54@ultra-secure.de> <CAG6CVpXEixt1Y%2BLAGmKBGRzo3i%2BKYxwSLzh24eLyxtb54Fj_Tw@mail.gmail.com> <2d16a2a9ac5c090f196674d40d0cb398@ultra-secure.de> <3E7C1D63-996E-4AA0-A0A4-455B996BB9D6@gmail.com> <CANCZdfp3ORMJ%2BW6EHswn4AHQWtsRk4wWRHmZO-nn5HEvFB-SYg@mail.gmail.com>
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> On May 27, 2019, at 7:20 PM, Warner Losh <imp@bsdimp.com> wrote: >=20 > On Mon, May 27, 2019, 6:49 PM Enji Cooper <yaneurabeya@gmail.com = <mailto:yaneurabeya@gmail.com>> wrote: >=20 > > On May 27, 2019, at 08:27, rainer@ultra-secure.de = <mailto:rainer@ultra-secure.de> wrote: > >=20 > > Am 2019-05-27 17:05, schrieb Conrad Meyer: > >> Hi Rainier, > >> On Mon, May 27, 2019 at 7:47 AM <rainer@ultra-secure.de = <mailto:rainer@ultra-secure.de>> wrote: > >>> I have a 32bit FreeBSD 6 binary that I'll need for a bit until the > >>> department who is technically responsible for the service gets = around > >>> redoing that service. > >> Even if this proposal is approved, it would only affect 13+. You > >> could still run your FreeBSD 6 binary in a 32-bit 12 VM in a 13+ > >> Bhyve. But do consider lighting a fire under whatever department > >> thinks it's ok to deploy like that :-). > >> Take care, > >> Conrad > >=20 > >=20 > > I thought so, too. > >=20 > > I don't really want to run the abandonware of a RADIUS-server any = longer than necessary (as absurd as that sounds). > >=20 > > It's also running a recursive nameserver (previously also = authoritative) that is still hard-coded in CPE and computers behind = firewalls. > >=20 > > I first wanted to virtualize it (it's not a big problem) - but this = way the problem is just dragged out: "But it still works, does it and we = have no time". > >=20 > > Everybody now knows that the clock is ticking, literally. > >=20 > > Oh, I also remember George Neville-Neil talking about a - what - = FreeBSD 4 binary that a certain search-engine had lost the sources for = and was running on FreeBSD 7 with compat4. > > (We also have a client who literally begged us to leave a decade-old = Solaris box running through 2019 and half of 2020 so they could continue = to do their bookkeeping on a home-grown java-app that I suspect they, = too have lost the sources to...). It's running jdk15 and getting that = thing to run under anything semi-decent doesn't seem to have worked-out = too well. > > So, people pray for the best and don't prepare for the worst. > >=20 > >=20 > > Other stuff I can think of: > > - very old Netbackup-Clients (like 5-series), though I doubt they = still work on recent releases, because 7.71 (last official version and = intended for FreeBSD 11) stopped working on FreeBSD12, sadly) > > - certain pre-compiled VMWare Tools Modules? Pre open-source-tools = (I can never make up my mind if it's VMWare-open-Tools or = Open-VMWare-Tools or something different) > >=20 > >=20 > > What ever people do with COMPAT4-9 - it's bordering the = pathological. >=20 > I=E2=80=99ll counter the OP=E2=80=99s suggestion a bit: >=20 > It would be nice if the compat options were modularized and printed = out an EOS warning when loaded, so the user was aware that the modules = are not supported by FreeBSD, in terms of security and whatnot. >=20 > How is that relevant? They just control system calls, not any userland = libraries that might or might not have a security exposure. Plus, if not = done right you either startle the horses for no reason, or you run the = risk of a console DoS if you print something on each system call=E2=80=A6 My point was to suggest basically controlling the syscall table (like = linux does for instance). If a compat module was loaded, it would print = out the warning. Not on each syscall entry. That would be insanity as = far as performance degradation would be concerned :/. -Enji
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