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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