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Re: Permission Questions



On Mon, Aug 30, 2021 at 09:29:14PM +0000, Andy Smith wrote:
> Hello,
> 
> On Mon, Aug 30, 2021 at 05:07:16PM -0400, Greg Wooledge wrote:
> > unicorn:~$ strace bash -c 'echo stuff >> /tmp/123'
> > [...]
> > openat(AT_FDCWD, "/tmp/123", O_WRONLY|O_CREAT|O_APPEND, 0666) = -1 EACCES (Permission denied)
> > 
> > As far as I can see, this is a kernel bug.  Unless I'm overlooking
> > something...?
> 
> I think it's the sysctl fs.protected_regular:
> 
>     https://unix.stackexchange.com/a/503169

I think you're right.  The changed behavior doesn't happen in /srv (only
in /tmp), nor does it happen on a buster system.

According to <https://www.spinics.net/lists/fedora-devel/msg252453.html>
and <https://github.com/systemd/systemd/blob/main/NEWS>, the change
actually happened in... wait for it... systemd.

*sigh*


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