netdev - Re: [PATCH net-next] tls: don't reset prot->aad_size and prot->tail_size for TLS

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Message-ID: <20231020171448.484dcf2a@kernel.org>
Date: Fri, 20 Oct 2023 17:14:48 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Sabrina Dubroca <sd@...asysnail.net>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Boris
 Pismenny <borisp@...dia.com>, Eric Dumazet <edumazet@...gle.com>, John
 Fastabend <john.fastabend@...il.com>, Paolo Abeni <pabeni@...hat.com>,
 Simon Horman <horms@...nel.org>, Tariq Toukan <ttoukan.linux@...il.com>
Subject: Re: [PATCH net-next] tls: don't reset prot->aad_size and
 prot->tail_size for TLS_HW

On Fri, 20 Oct 2023 16:00:55 +0200 Sabrina Dubroca wrote:
> Prior to commit 1a074f7618e8 ("tls: also use init_prot_info in
> tls_set_device_offload"), setting TLS_HW on TX didn't touch
> prot->aad_size and prot->tail_size. They are set to 0 during context
> allocation (tls_prot_info is embedded in tls_context, kzalloc'd by
> tls_ctx_create).
> 
> When the RX key is configured, tls_set_sw_offload is called (for both
> TLS_SW and TLS_HW). If the TX key is configured in TLS_HW mode after
> the RX key has been installed, init_prot_info will now overwrite the
> correct values of aad_size and tail_size, breaking SW decryption and
> causing -EBADMSG errors to be returned to userspace.
> 
> Since TLS_HW doesn't use aad_size and tail_size at all (for TLS1.2,
> tail_size is always 0, and aad_size is equal to TLS_HEADER_SIZE +
> rec_seq_size), we can simply drop this hunk.
> 
> Fixes: 1a074f7618e8 ("tls: also use init_prot_info in tls_set_device_offload")
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
> ---
> Tariq, does that solve the problem you reported in
> https://lore.kernel.org/netdev/3ace1e75-c0a5-4473-848d-91f9ac0a8f9c@gmail.com/
> ?

In case Tariq replies before Monday and DaveM wants to take it, LGTM:

Acked-by: Jakub Kicinski <kuba@...nel.org>