bugGNU GRUB - Bugs: bug #64918, Provide random entropy for the...

 
 

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bug #64918: Provide random entropy for the OpenBSD kernel

Submitter:  Yuichiro Naito <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: 
Open/Closed:  Open Release:  2.02
Release:  Reproducibility:  Every Time
Planned Release:  None

Wed 22 Nov 2023 06:47:42 AM UTC, original submission:  

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”.

Yuichiro Naito <yuichiro>

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attached Files
file #55346:  openbsd_randomdata.patch added by yuichiro (6KiB - application/octet-stream)

 

Depends on the following items: None found

Items that depend on this one: None found

 

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  • -email is unavailable- added by yuichiro (Submitted the item)

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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2023-11-22 yuichiro Attached File- Added openbsd_randomdata.patch, #55346

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