resolve: enable RES_TRUSTAD towards the 127.0.0.53 stub resolver

glibc 2.31 strips the AD flag, unless either the application specifies RES_TRUSTAD or the options in resolv.conf contain trust-ad. See https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=NEWS;hb=HEAD
systemd · Jun 6, 2020 · a742f98 · a742f98
1 parent 9141594
commit a742f98
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/src/resolve/resolv.conf b/src/resolve/resolv.conf
@@ -15,4 +15,4 @@
 # operation for /etc/resolv.conf.
 
 nameserver 127.0.0.53
-options edns0
+options edns0 trust-ad
diff --git a/src/resolve/resolved-resolv-conf.c b/src/resolve/resolved-resolv-conf.c
@@ -307,7 +307,7 @@ static int write_stub_resolv_conf_contents(FILE *f, OrderedSet *dns, OrderedSet
               "# operation for /etc/resolv.conf.\n"
               "\n"
               "nameserver 127.0.0.53\n"
-              "options edns0\n", f);
+              "options edns0 trust-ad\n", f);
 
         if (!ordered_set_isempty(domains))
                 write_resolv_conf_search(domains, f);