Re: UART question

On Fri, Jul 11, 2025 at 09:11:31AM +1200, Lloyd Parkes wrote:
> On Wed, 2025-07-09 at 06:30 +0000, Vincent DEFERT wrote:
> > What's the benefit of providing accurate information on the system?
> 
> I have used BSD, Linux and many other Unixes for some decades now and I
> have never used /dev to find out what devices are present on a system.
> 
> I suspect that this is behaviour that you have learned because Linux
> makes it hard to use dmesg. On (all?) other Unixes dmesg can be run by
> an unprivileged user.

Yes, dmesg has been restricted for non-privileged users for a while,
because it is considered an information leak that could provide
useful information for local privilege escalation attacks,
but that can be disabled via sysctl kernel.dmesg_restrict=0.

> Of course, Linux is also somewhat notorious for
> not putting useful information in dmesg to start with.

How you looked at typical dmesg on Linux? There is a _lot_ of
information in there. Of course it does help if one knows
what one is looking for (e.g. device names).

Kind regards,
          Alex.
-- 
"Opportunity is missed by most people because it is dressed in overalls and
 looks like work."                                      -- Thomas A. Edison