[Bug 295463] upgrade to 15.0 p9: booting freezes with "EFI framebuffer information"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295463

--- Comment #9 from Robert William Vesterman <bob@vesterman.com> ---
(In reply to Vladlen Popolitov from comment #8)

Thanks.

I know very little about all this booting stuff, and the information I've been
able to glean about it from man pages and such is not clear to me. I am OK with
just keeping with my current workaround* until (if?) this is "really" fixed,
rather than trying to mess around with stuff I only vaguely understand (if at
all).

However, I'm concerned with something about this for the future, even if a
"real" fix is made for this current occurrence of what seems to me to be a more
general problem:

Am I understanding correctly that this "slop" area must be manually configured
by the end user in order to prevent buffer overflow at boot time? Is this not a
security issue waiting to happen?

Or, at the very least, a very non-obvious and very error-prone system
maintenance issue (i.e. whenever you get an upgrade sysutils/cpu-microcode
port, make sure to remember to once again manually check the size of the "slop"
area versus the microcode size)?

*: "my current workaround" has me up and running with p9; basically removed the
cpu_microload stuff from /boot/loader.conf and ensured that copies of
/boot/loader.efi are at /boot/efi/efi/boot/bootx64.efi and
/boot/efi/efi/freebsd/loader.efi, as was suggested on the FreeBSD Forums thread
I opened:

https://forums.freebsd.org/threads/upgrade-to-15-0-p9-booting-freezes-with-efi-framebuffer-information.102766/

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