checksecurity shows find: ‘/dev/.lxd-mounts’: Permission denied in lxd container

[Mitchell Dzurick]

in an LXD container, attempting to use checksecurity will result in the string being printed:
find: ‘/dev/.lxd-mounts’: Permission denied

repro:

$ lxc launch ubuntu-daily:noble n
$ lxc shell n
# apt install -y checksecurity
# checksecurity
...
find: ‘/dev/.lxd-mounts’: Permission denied
...

This comes from the extension check-setuid

```
root@n:~# checksecurity -debug
Checking plugin DISKFREE
Executing plugin diskfree (/usr/share/checksecurity/check-diskfree)
Checking plugin IPTABLES-LOGS
Plugin IPTABLES-LOGS Disabled
Value was
Checking plugin PASSWD
Executing plugin passwd (/usr/share/checksecurity/check-passwd)
Checking plugin SETUID
Executing plugin setuid (/usr/share/checksecurity/check-setuid)
find: ‘/dev/.lxd-mounts’: Permission denied
Checking plugin SOCKETS
Executing plugin sockets (/usr/share/checksecurity/check-sockets)
```

Debugging further:

# sed '30s/^/set -x\n/' -i /usr/share/checksecurity/check-setuid
# checksecurity
...
+ ionice -t -c3 find / /dev /dev/lxd /dev/.lxd-mounts /snap /run/snapd/ns/lxd.mnt -ignore_readdir_race -xdev ( -false ) -prune -o ( -type f -perm /06000 -o ( ( -type b -o -type c ) -a -not ( -false ) ) ) -printf %8i %5m %3n %-10u %-10g %9s %t %h/%f\n
find: ‘/dev/.lxd-mounts’: Permission denied
...

[Mitchell Dzurick (mitchdz)]

I don't have time to fix this, just reporting an issue I noticed during the noble merge.

[Sergio Durigan Junior (sergiodj)]

I believe the title and description should be adjusted to clarify that this happens in LXD containers, not LXC (which are different types of containers).

[Mitchell Dzurick (mitchdz)]

Ah my bad, I've been using those terms interchangeably. Thanks Sergio! I'll update it.