URL:
<https://savannah.gnu.org/bugs/?64918>
Summary: Provide random entropy for the OpenBSD kernel
Group: GNU GRUB
Submitter: yuichiro
Submitted: Wed 22 Nov 2023 06:47:42 AM UTC
Category: Booting
Severity: Major
Priority: 5 - Normal
Item Group: Feature Request
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Release: 2.02
Release:
Discussion Lock: Any
Reproducibility: Every Time
Planned Release: None
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Follow-up Comments:
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Date: Wed 22 Nov 2023 06:47:42 AM UTC By: Yuichiro Naito <yuichiro>
The OpenBSD kernel expects that the loader fills random entropy in the
“.openbsd.randomdata” section. The OpenBSD loader generates pseudo-random
data in the following code.
https://github.com/openbsd/src/blob/master/sys/lib/libsa/loadfile_elf.c#L100-L108
I added almost the same logic to Grub2. It filled random bytes generated by
encrypted data from the random key and initial vector. And I fixed the
“pmtimer_tsc_get_random_bit” function to use the second bit, next to LSB.
Because my PC (core i7-6700) always returns even TSC value. So the LSB of the
TSC value is always 0. It won’t be the random bit.
My patch suppresses the OpenBSD kernel warning message,
“warning: no entropy supplied by boot loader”.
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File Attachments:
-------------------------------------------------------
Date: Wed 22 Nov 2023 06:47:42 AM UTC Name: openbsd_randomdata.patch Size:
6KiB By: yuichiro
<http://savannah.gnu.org/bugs/download.php?file_id=55346>
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