What to do on Warning: Tainted filename for search '/etc/exim4/virtual/some.domain?
Let’s suppose that once upon a time you had set up your aliases for virtual domains like this:
# cat /etc/exim4/conf.d/router/350_exim4-config_vdom_aliases
[...]
vdom_aliases:
driver = redirect
allow_defer
allow_fail
domains = dsearch;/etc/exim4/virtual
data = ${expand:${lookup{$local_part}lsearch*@{/etc/exim4/virtual/$domain}}}
retry_use_local_part
pipe_transport = address_pipe
file_transport = address_file
[...]
Upon upgrading your machine from Debian buster to Debian bullseye, following the upgrade release documentation you find out that this lookup will complain about tainted filename lookups:
# grep -i taint /var/log/exim4/*log
[...]
[...] Warning: Tainted filename for search '/etc/exim4/virtual/some.domain
[...]
What to do? Use the untainted variable $domain_data instead of $domain! Thus:
# cat /etc/exim4/conf.d/router/350_exim4-config_vdom_aliases
[...]
vdom_aliases:
[...]
data = ${expand:${lookup{$local_part}lsearch*@{/etc/exim4/virtual/$domain_data}}}
[...]
Voilà!