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From: Phil Sutter <>
To: Arnd Bergmann <>
Cc:, Pablo Neira Ayuso <>,
	Jozsef Kadlecsik <>,
	Florian Westphal <>,
	"David S. Miller" <>,, Ander Juaristi <>,
	wenxu <>, Thomas Gleixner <>,,,
Subject: Re: [PATCH 09/16] netfilter: nft_meta: use 64-bit time arithmetic
Date: Sat, 9 Nov 2019 12:20:10 +0100
Message-ID: <> (raw)
In-Reply-To: <>

On Fri, Nov 08, 2019 at 10:32:47PM +0100, Arnd Bergmann wrote:
> On 32-bit architectures, get_seconds() returns an unsigned 32-bit
> time value, which also matches the type used in the nft_meta
> code. This will not overflow in year 2038 as a time_t would, but
> it still suffers from the overflow problem later on in year 2106.

I wonder if the assumption that people will still use nft_meta 80 years
from now is an optimistic or pessimistic one. :)

> Change this instance to use the time64_t type consistently
> and avoid the deprecated get_seconds().
> The nft_meta_weekday() calculation potentially gets a little slower
> on 32-bit architectures, but now it has the same behavior as on
> 64-bit architectures and does not overflow.
> Fixes: 63d10e12b00d ("netfilter: nft_meta: support for time matching")
> Signed-off-by: Arnd Bergmann <>

Acked-by: Phil Sutter <>

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 21:32 [PATCH 00/16] drivers: y2038 updates Arnd Bergmann
2019-11-08 21:32 ` [PATCH 09/16] netfilter: nft_meta: use 64-bit time arithmetic Arnd Bergmann
2019-11-09 11:20   ` Phil Sutter [this message]
2019-11-15 22:44   ` Pablo Neira Ayuso

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