CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2026/06/21 13:28:07
Modified files:
lib/libc/asr : gethostnamadr_async.c
Log message:
Skip aliases that are not valid hostnames in gethostbyname(3).
Consider the following CNAME chain:
chain7.narrans.de. 60 IN CNAME chain\007.tlakh.xyz.
chain\007.tlakh.xyz. 60 IN CNAME chain.sha256.net.
chain.sha256.net. 60 IN CNAME sha256.net.
sha256.net. 60 IN A 213.239.192.17
gethostbyname(3) would fail the query when it encounters
chain\007.tlakh.xyz. and tries to add it to h_aliases member of struct
hostent because it's not a valid hostname. This in turn would fail the
whole query.
With this, resolution succeeds and we get an alias list of
"chain7.narrans.de chain.sha256.net".
hostent_add_alias() can no longer fail, so make it void.
Noticed by dgl while we were working on something else.
OK deraadt
