On Sunday, January 30, 2022, 2:26:08 AM PST, Roman Mamedov <r...@romanrm.net> 
wrote:
 
 On Fri, 28 Jan 2022 19:58:49 -0700
David Fifield <da...@bamsoftware.com> wrote:

>> But a slight variation does work: make secret_onion_key.old and 
>> secret_onion_key_ntor.old *directories*, so that tor_rename cannot rename a 
>> file over them. It does result in an hourly `BUG` stack trace, but otherwise 
>> it seems effective.

>> I did a test with two tor instances. The rot1 instance had the directory 
>> hack to prevent onion key rotation. The rot2 had nothing to prevent onion 
>> key rotation.

> I did not follow the thread closely, but if you want a file or directory
contents unchangeable, and not allowed to rename/delete even by root, there's
the "immutable" attribute (chattr +i).

I like the immutable attribute approach. It can be applied to the original 
secret_onion_key and secret_onion_key_ntor files.
Appreciate the input.
Respectfully,

Gary—
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