Date: Sat, 21 Mar 2026 18:44:54 +0000 From: Shawn Webb <shawn.webb@hardenedbsd.org> To: Charlie Li <vishwin@freebsd.org> Cc: Warner Losh <imp@bsdimp.com>, A FreeBSD User <freebsd@walstatt-de.de>, Martin Matuska <mm@freebsd.org>, src-committers <src-committers@freebsd.org>, "<dev-commits-src-all@freebsd.org>" <dev-commits-src-all@freebsd.org>, "<dev-commits-src-main@freebsd.org>" <dev-commits-src-main@freebsd.org> Subject: Re: git: 8a62a2a5659d - main - zfs: merge openzfs/zfs@f8e5af53e Message-ID: <flq55iislddq5ydlcxi7ysmbfimvcnye3ka5awdzeugkhlgkle@hobplnwmptcq> In-Reply-To: <3f1bdb7c-2812-48de-a329-d34c586cad8b@freebsd.org> References: <CANCZdfpaKyzMDL0%2BMk3tSEeqsSU_C-OoWo1Dwwjg%2BG%2BrxiV2Eg@mail.gmail.com> <hqup3oiorbdgvtputen566fcajjoucurqpk7je6qchixat3i6c@zmfpxouvy7vs> <wryftbwxvsc3mhm6iglbx3ikzentaoewo3ldiw4knyqkckmhmo@hnmn3nosgawc> <becfc71c-2ea1-4a13-a3b1-3235f056badf@freebsd.org> <20260321090444.6f81da15@thor.sb211.local> <qeang5o4tlutdyxu2zfksbpljrrvf22eebf6r7b62umffzaymn@or5qwqnmbtbx> <CANCZdfq7YQuzgavRWm=DMKEvxQE9cYOFAEMpgk6faQwOL2tC2Q@mail.gmail.com> <5eaaokkdmmkcojky7362jvkandaard6eu26n77f5z5q7lqutu5@kywp5prvxozj> <CANCZdfrEppttf%2Btu%2BvpHKGd8ikSBpPJ=38cpE%2BsRzD1AjRpFhQ@mail.gmail.com> <3f1bdb7c-2812-48de-a329-d34c586cad8b@freebsd.org>
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[-- Attachment #1 --] On Sat, Mar 21, 2026 at 02:40:27PM -0400, Charlie Li wrote: > Warner Losh wrote: > > > > > > On Sat, Mar 21, 2026 at 9:23 AM Shawn Webb <shawn.webb@hardenedbsd.org > > <mailto:shawn.webb@hardenedbsd.org>> wrote: > > > > On Sat, Mar 21, 2026 at 09:18:20AM -0600, Warner Losh wrote: > > > On Sat, Mar 21, 2026, 9:08 AM Shawn Webb > > <shawn.webb@hardenedbsd.org <mailto:shawn.webb@hardenedbsd.org>> wrote: > > > > > > > On Sat, Mar 21, 2026 at 09:04:17AM +0100, A FreeBSD User wrote: > > > > > Am Tage des Herren Fri, 20 Mar 2026 23:27:20 -0400 > > > > > Charlie Li <vishwin@freebsd.org <mailto:vishwin@freebsd.org>> > > schrieb: > > > > > > > > > > > Shawn Webb wrote: > > > > > > > On Tue, Mar 17, 2026 at 04:52:16PM +0000, Shawn Webb wrote: > > > > > > >> On Tue, Mar 17, 2026 at 10:44:59AM -0600, Warner Losh wrote: > > > > > > >>> On Tue, Mar 17, 2026 at 10:36 AM Shawn Webb < > > > > shawn.webb@hardenedbsd.org <mailto:shawn.webb@hardenedbsd.org>> > > > > > > >>> wrote: > > > > > > >>> > > > > > > >>>> Hey Martin, > > > > > > >>>> > > > > > > >>>> On Sat, Mar 14, 2026 at 01:26:23PM +0000, Martin > > Matuska wrote: > > > > > > >>>>> The branch main has been updated by mm: > > > > > > >>>>> > > > > > > >>>>> URL: > > > > > > >>>> > > > > https://cgit.FreeBSD.org/src/commit/? > > id=8a62a2a5659d1839d8799b4274c04469d7f17c78 <https:// > > cgit.FreeBSD.org/src/commit/? > > id=8a62a2a5659d1839d8799b4274c04469d7f17c78> > > > > > > > > > > >>>>> > > > > > > >>>>> commit 8a62a2a5659d1839d8799b4274c04469d7f17c78 > > > > > > >>>>> Merge: f91464171d61 f8e5af53e92f > > > > > > >>>>> Author: Martin Matuska <mm@FreeBSD.org> > > > > > > >>>>> AuthorDate: 2026-03-14 12:14:56 +0000 > > > > > > >>>>> Commit: Martin Matuska <mm@FreeBSD.org> > > > > > > >>>>> CommitDate: 2026-03-14 12:14:56 +0000 > > > > > > >>>>> > > > > > > >>>>> [snip for brevity] > > > > > > >>>>> > > > > > > >>>>> Obtained from: OpenZFS > > > > > > >>>>> OpenZFS commit: > > f8e5af53e92fa7c03393fbd4922cb9c1d0c15920 > > > > > > >>>> > > > > > > >>>> This commit seems to cause issues when building boot > > loader > > > > related > > > > > > >>>> code: > > > > > > >>>> > > > > > > >>>> ==== BEGIN LOG ==== > > > > > > >>>> 114232 bytes available > > > > > > >>>> btxld -v -f aout -e 0x200000 -o loader_simp -l > > > > > > >>>> /usr/obj/usr/src/amd64.amd64/stand/i386/btx/btxldr/ > > btxldr -b > > > > > > >>>> /usr/obj/usr/src/amd64.amd64/stand/i386/btx/btx/btx > > > > loader_simp.bin > > > > > > >>>> kernel: ver=1.02 size=690 load=9000 entry=9010 map=16M > > pgctl=0:58 > > > > > > >>>> client: fmt=elf size=5e2e8 text=57930 data=514c > > bss=7470 entry=0 > > > > > > >>>> output: fmt=aout size=61000 text=1000 data=5f000 > > org=200000 > > > > entry=200000 > > > > > > >>>> ===> stand/i386/pxeldr (all) > > > > > > >>>> -560 bytes available > > > > > > >>>> *** Error code 1 > > > > > > >>>> > > > > > > >>> > > > > > > >>> What all do you have enabled? The defaults aren't even > > close to > > > > running out > > > > > > >>> of space (though I've not looked at this). > > > > > > >> > > > > > > >> Hey Warner, > > > > > > >> > > > > > > >> Thanks for reaching out! I've uploaded `make showconfig` > > here: > > > > > > >> https://hardenedbsd.org/~shawn/2026-03-17_srcconf- > > r01.txt <https://hardenedbsd.org/~shawn/2026-03-17_srcconf-r01.txt>; > > > > > > >> > > > > > > >> The following options are specific to HardenedBSD (in no > > particular > > > > > > >> order): > > > > > > >> > > > > > > >> 1. MK_HBSD_UPDATE > > > > > > >> 2. MK_HBSDCONTROL > > > > > > >> 3. MK_PIE > > > > > > >> 4. MK_RELRO > > > > > > >> 5. MK_SHLIBRANDOM > > > > > > >> 6. MK_ZERO_REGS > > > > > > >> 7. MK_SPECTREV1_FIX > > > > > > >> 8. MK_SAFESTACK > > > > > > >> 9. MK_RETPOLINE > > > > > > >> 10. MK_LTOLIB > > > > > > >> 11. MK_CFI > > > > > > > > > > > > > > MK_RETPOLINE was the culprit. Something about this ZFS > > commit causes > > > > > > > LLVM to emit more retpoline entries than before--too many > > for a > > > > little > > > > > > > bootloader. That might be something to investigate later, > > but only to > > > > > > > satisfy a curious mind, not to actuall fix anything > > (since nothing's > > > > > > > actually broken.) > > > > > > > > > > > > > > Since it doesn't really make sense to apply speculative > > execution > > > > > > > mitigations to a bootloader, I disabled retpoline for a > > components > > > > > > > in stand/. > > > > > > > > > > > > > > Good to go. > > > > > > > > > > > > > Also just got bit by this, albeit during the lua loader, > > since I have > > > > > > WITH_RETPOLINE in my src.conf. > > > > > > > > > > > > > > > > Hello, > > > > > > > > > > I do not have WITH_RETPOLINE in my /etc/src.conf, but since I > > got this > > > > mysterious error about > > > > > not enough bytes left, I use WITHOUT_LOADER_PXEBOOT= YES (due > > to issues > > > > with WITH_BEARSSL=YES > > > > > also used). > > > > > Despite not using any WITH_RETPOLINE I also catch the error ... > > > > > > > > Something about this ZFS commit causes the boot laoder to be > > too big. > > > > I guess the first sign of trouble was with retpolines, but > > there seem > > > > to now be additional signs. > > > > > > > > What's the process for filing a bug report against OpenzFS for > > > > something like this? (Not asking you directly, just a general > > question > > > > for the thread.) > > > > > > > > > > That's a good question. We are rapidly aporoaching the day we > > will have to > > > freeze the set of zfs feature that we can boot with the BIOS > > path. There's > > > only so much space. > > > > > > Right now, there's little to no bootloader testing, let alone > > analysis > > > done and that will need to change. > > > > Another question might also be: is it worth the time and effort? Are > > people really using a ZFS-enabled traditional MBR BIOS bootloader on > > FreeBSD 16-CURRENT (or eventual 16.0-RELEASE)? From my rather naive > > (and ignorant, since I don't know FreeBSD's userbase well), it seems > > like folks use either loader.efi or u-boot (or both!) > > > > > > Nobody uses MBR BIOS bootloader. It's totally unsupported. They all use the > > GPT one, which is used for all kinds of things, most recently several > > light-weight > > VM systems that don't have UEFI. BIOS is what imposes the limit, not MBR. > > > > But there's a huge number of systems that are already in the field that need > > to be upgradeable, but we will eventually need to draw a line in the > > sand for > > that. > > > The machine where I hit this error on building the lua loader is a BIOS-GPT > system. I apologize for my incorrect statements. The inclusion of MBR was erroneous. Warner's got it right. :-) I've completely forgotten about gptzfsboot. Been so long and memory's a fuzzy thing. -- Shawn Webb Cofounder / Security Engineer HardenedBSD Signal Username: shawn_webb.74 Tor-ified Signal: +1 303-901-1600 / shawn_webb_opsec.50 https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEA6TL67gupaZ9nzhT/y5nonf44foFAmm+5x4ACgkQ/y5nonf4 4fq/9Q/9GnHaL8k8sIx5QhehAo+xgDxxXXDmjBBStiiDpmKeXO59MCjCeSgHi2Rm o6FxdduPbL2cu62PiiZmS1NFpnnPg7Clnc+zkeuXEAveGDCek4lfTfDOmNdJa90+ CGo+ajjA2Q7n2O5ml0FqcK+veonzc1H+ytS3LH6LXwGac9Qq5sQy3afkDtlYRBkh eWLzJLHQnGvbJvzOUGREwzE9wzqB3/ZC+q+lJONdrBot54hPsEgVC24EkjxXCt6z C17QJALW4R1sjHW9FohfzMCvh1V6iI3a+Ah9PeWdSF72mXV7j/6xPtKB+RqXBVWE vfAB8axCteSx4x2CVxl8oRVNqNJ+VUNzAHpiiYoNvmWb3yLiFC8gklA8FeE2s9Ng nOt01y3ZTmdDG8IX5ZzGr5cw/WjVvxtUHShaPLFBh1pfCAGebUD+lKV9a290pNUq QtUJcF6K1S8HhDN5unQy2JaTvbTRIssTYN9UdwQoGQXXWARV8rVIonG16Gq8g4IN aDgNzYM+ziv2k9YIZz6UNNLVqVZurfB6gmUHtUgZp2vkOKrBiN1cBRgOZ90PSBv1 1eorv+TqTLTqyyn8UMptQ6egE+X5ZEa2Fo/Jm9gYtabppcmqo1lQA5Fq8odC8DCJ rOTJihnYyapqS7m116Wdq70dGohwp3uCJKVNYZSRwrd0bgMFIHA= =dFvN -----END PGP SIGNATURE-----home | help
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