netdev - Re: [PATCH net] tipc: use a write lock for keepalive

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Date:   Wed, 30 Mar 2022 22:48:26 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jon Maloy <jmaloy@...hat.com>
Cc:     Niels Dossche <dossche.niels@...il.com>,
        tipc-discussion@...ts.sourceforge.net, netdev@...r.kernel.org,
        Ying Xue <ying.xue@...driver.com>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Hoang Le <hoang.h.le@...tech.com.au>
Subject: Re: [PATCH net] tipc: use a write lock for keepalive_intv instead
 of a read lock

On Tue, 29 Mar 2022 18:12:14 +0200 Niels Dossche wrote:
> Currently, n->keepalive_intv is written to while n is locked by a read
> lock instead of a write lock. This seems to me to break the atomicity
> against other readers.
> Change this to a write lock instead to solve the issue.
> 
> Note:
> I am currently working on a static analyser to detect missing locks
> using type-based static analysis as my master's thesis
> in order to obtain my master's degree.
> If you would like to have more details, please let me know.
> This was a reported case. I manually verified the report by looking
> at the code, so that I do not send wrong information or patches.
> After concluding that this seems to be a true positive, I created
> this patch. I have both compile-tested this patch and runtime-tested
> this patch on x86_64. The effect on a running system could be a
> potential race condition in exceptional cases.
> This issue was found on Linux v5.17.
> 
> Fixes: f5d6c3e5a359 ("tipc: fix node keep alive interval calculation")
> Signed-off-by: Niels Dossche <dossche.niels@...il.com>

Looks good, Jon?