netdev - Re: [PATCH net v3] net-timestamp: make sk_tskey more predictable in error path

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Message-ID: <65cb81133b8_2220892948a@willemb.c.googlers.com.notmuch>
Date: Tue, 13 Feb 2024 09:47:47 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Vadim Fedorenko <vadfed@...a.com>, 
 Vadim Fedorenko <vadim.fedorenko@...ux.dev>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Andy Lutomirski <luto@...capital.net>
Cc: Vadim Fedorenko <vadfed@...a.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 "David S . Miller" <davem@...emloft.net>, 
 Willem de Bruijn <willemb@...gle.com>, 
 netdev@...r.kernel.org
Subject: Re: [PATCH net v3] net-timestamp: make sk_tskey more predictable in
 error path

Vadim Fedorenko wrote:
> When SOF_TIMESTAMPING_OPT_ID is used to ambiguate timestamped datagrams,
> the sk_tskey can become unpredictable in case of any error happened
> during sendmsg(). Move increment later in the code and make decrement of
> sk_tskey in error path. This solution is still racy in case of multiple
> threads doing snedmsg() over the very same socket in parallel, but still
> makes error path much more predictable.
> 
> Fixes: 09c2d251b707 ("net-timestamp: add key to disambiguate concurrent datagrams")
> Reported-by: Andy Lutomirski <luto@...capital.net>
> Signed-off-by: Vadim Fedorenko <vadfed@...a.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>