Re: dmesg suddenly fails when run as normal user on FC39

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On Wed, 2024-03-13 at 16:47 -0700, Samuel Sieb wrote:
> On 3/13/24 16:05, Ron Flory via users wrote:
> >   does not happen on FC38, or any prior RedHat/Fedora version since
> > forever.
> > 
> >     dmesg
> >     dmesg: read kernel buffer failed: Operation not permitted
> > 
> >   Userspace scripts (such as used to read pics from cameras &
> > sdcards) 
> > and many progs often use dmesg to detect or identify things like
> > startup 
> > probe info, USB devs, partition numbers etc.
> > 
> >   I worked around this by setting the suid bit of `which dmesg`,
> > but it 
> > would be rude to force everybody to manually do this as part of 
> > post-install cleanup.
> > 
> >   Hopefully an unintended side-effect and not a new "feature" that 
> > wasn't thought through completely.  A web-search suggests
> > debian/ubuntu 
> > may have been doing this for awhile- but we really don't need to be
> > just 
> > like them...    ;)
> 
> This was intentional and there was a thread about this recently, 
> probably on devel or test.  It's considered to be a big security
> issue.
> 
> If you're in the wheel group, you can use "journalctl -k".

I think the error message is unhelpful. 'dmesg' could easily detect
that it wasn't running as root and say something more meaningful.

poc
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