Messages in this thread | | | Date | Wed, 22 Mar 2023 05:51:10 +0100 | From | Traian Teodorescu <> | Subject | Fwd: Linux entropy |
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Hello,
I've been redirected by the "friendly bot" to you (I've already looked into "kernelnewbies" but I didn't find a linked topic). I would want to know more about the subject below. Is there another possibility to read the value of current entropy in new versions of kernel ? Are the old services (as for instance haveged) still compatible ?
Thank you and have a nice evening,
Traian
-------- Forwarded Message -------- Subject: Linux entropy Date: Tue, 21 Mar 2023 17:03:36 +0100 From: Traian Teodorescu <traian.teodorescu@bluewin.ch> To: gregkh@linuxfoundation.org
Mr Kroah-Hartmann,
I've recently discovered that the value containing the machine's entropy (in /proc/sys/kernel/random/entropy_avail ) isn't updated anymore on one of my machines. I found some articles on the Internet about this change, but nothing very "official".
There is also an explanation at "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.15.y&id=e7e196e1ae2603a2c5f1894f1868a7a5b5a2c5e0" about keeping forward secrecy, etc, that I didn't really understood.
I began using Linux since less than 10 years and I am not what you can call an experienced user, but from my point of view this change doesn't make sense. If I understand well some basic principles, Linux kernel is the only one meant to be accessible to everybody wanting to understand deeply how a modern OS works, so what's the gain in this "obfuscation" ? From my point of view, a sysadmin should know how much entropy they have on their machines.
So, please, can you please make some comments about this change ? (of eventually send me a link to an article that I can trust ?)
I really enjoyed Linux a lot those years and I learned to appreciate it, so from this point of view I am grateful to the teams maintaining free software, so ... thank you !
Thanks for an eventual answer and have a nice evening,
Traian
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