From: Silvio Gissi sifonsec@amazon.com
stable inclusion from stable-v5.10.217 commit ad2011ea787928b2accb5134f1e423b11fe80a8a category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9TM8D CVE: CVE-2024-36031
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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 Signed-off-by: Yi Yang yiyang13@huawei.com --- security/keys/key.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/security/keys/key.c b/security/keys/key.c index 67ad0826e385..e5111ce17e25 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -464,7 +464,8 @@ static int __key_instantiate_and_link(struct key *key, if (authkey) key_invalidate(authkey);
- key_set_expiry(key, prep->expiry); + if (prep->expiry != TIME64_MAX) + key_set_expiry(key, prep->expiry); } }