Regression Linux 6.18.22: ipsec stops working: reason: commit 153d5520c3f9 "crypto: authencesn - Do not place hiseq at end of dst for out-of-place d.cryption"

Wolfgang Walter
2026-04-14T17:01:43Z

Hello,

with 6.12.18 ipsec stopped working for us. After reverting commit

commit 153d5520c3f9fd62e71c7e7f9e34b59cf411e555.
Author: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri Mar 27 15:04:17 2026 +0900

crypto: authencesn - Do not place hiseq at end of dst for
out-of-place decryption

[ Upstream commit e02494114ebf7c8b42777c6cd6982f113bfdbec7 ]

When decrypting data that is not in-place (src != dst), there is
no need to save the high-order sequence bits in dst as it could
simply be re-copied from the source.

However, the data to be hashed need to be rearranged accordingly.

Reported-by: Taeyang Lee <0wn@theori.io>
Fixes: 104880a6b470 ("crypto: authencesn - Convert to new AEAD
interface")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Thanks,

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

ipsec worked again. We use esn here.

Regards,
--
Wolfgang Walter
Studierendenwerk München Oberbayern
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