On 2016-03-06 11:17, Dimitry Andric wrote:
On 06 Mar 2016, at 17:00, Oliver Pinter <oliver.pin...@hardenedbsd.org>
wrote:
On 3/6/16, Dimitry Andric <d...@freebsd.org> wrote:
Author: dim
Date: Sun Mar 6 15:57:43 2016
New Revision: 296428
URL: https://svnweb.freebsd.org/changeset/base/296428
Log:
Since kernel modules can now contain sections of type
SHT_AMD64_UNWIND,
the boot loader should not skip over these anymore while loading
images.
Otherwise the kernel can still panic when it doesn't find the
.eh_frame
section belonging to the .rela.eh_frame section.
Unfortunately this will require installing boot loaders from
sys/boot
before attempting to boot with a new kernel.
Could you please add a note about this to UPDATING file?
I am a bit torn on this, because normally we always tell people to
install the kernel first, reboot, then run make installworld (which
also
installs the boot loaders).
However, in this case, people might depend on their boot loader loading
modules which are required to make the system boot at all. So if they
happened to forget updating their boot loader first, a panic might be
the result.
I wonder what a failsafe and acceptable upgrade scenario is, in this
case. Normally the procedure is something like:
make buildworld
make buildkernel (with KERNCONF=whatever, if needed)
make installkernel (again with KERNCONF, if needed)
reboot (to single user, but cheating is possible usually)
mergemaster -p
make installworld
This could maybe be modified to:
make buildworld
make buildkernel (with KERNCONF=whatever, if needed)
make installkernel (again with KERNCONF, if needed)
make -C sys/boot install
reboot (to single user, but cheating is possible usually)
mergemaster -p
make installworld
E.g. insert the step which installs the boot loaders just after (or
before) the step which installs the kernel.
Is something like this acceptable as a one-time workaround, or maybe it
is better in general, in case we ever add other new features to the
boot
loaders?
-Dimitry
In my opinion, boot *blocks* (boot1) should be updated seldomly and not
on every install.
All (?) instances of not updating these resulting in a failed boot have
an UPDATING
entry or a similar warning (like the one during "zpool upgrade").
- Nikolai Lifanov
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