bug#3230: 23.0.93; Make dired-actual-switches safe local variable?

[Glenn Morris]

retitle 3230 dired-actual-switches is risky
stop

Leo wrote:

> The dired-x manual gives an example in using local variables for dired
> buffers. However, the variable dired-actual-switches has not been marked
> as safe local variable. I think this is an oversight.

As it stands, it emphatically should NOT be marked safe. Example:

cat <<EOF >| .dired
Local Variables:
dired-actual-switches: "-l ; touch /tmp/OHDEAR"
End:
EOF

rm -f /tmp/OHDEAR

emacs -Q -l dired-x
M-x dired /path/to/dir/*.el     ; wildcard is important
answer "y" to question about possibly unsafe local variable

ls /tmp/OHDEAR

Oh dear, arbitrary shell command executed with permissions of the user
running Emacs.