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keys: Fix overwrite of key expiration on instantiation 

commit 9da27fb65a14c18efd4473e2e82b76b53ba60252 upstream.

The expiry time of a key is unconditionally overwritten during
instantiation, defaulting to turn it permanent. This causes a problem
for DNS resolution as the expiration set by user-space is overwritten to
TIME64_MAX, disabling further DNS updates. Fix this by restoring the
condition that key_set_expiry is only called when the pre-parser sets a
specific expiry.

Fixes: 39299bdd2546 ("keys, dns: Allow key types (eg. DNS) to be reclaimed immediately on expiry")
Signed-off-by: Silvio Gissi <sifonsec@amazon.com>
cc: David Howells <dhowells@redhat.com>
cc: Hazem Mohamed Abuelfotoh <abuehaze@amazon.com>
cc: linux-afs@lists.infradead.org
cc: linux-cifs@vger.kernel.org
cc: keyrings@vger.kernel.org
cc: netdev@vger.kernel.org
cc: stable@vger.kernel.org
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Silvio Gissi 2024-03-15 15:05:39 -04:00 committed by Greg Kroah-Hartman
parent 9fda5aed60
commit 25777f3f4e
1 changed files with 2 additions and 1 deletions
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1
security/keys/key.c
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@ -464,6 +464,7 @@ static int __key_instantiate_and_link(struct key *key,
if (authkey)
key_invalidate(authkey);
if (prep->expiry != TIME64_MAX)
key_set_expiry(key, prep->expiry);
}
}