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From: Arnd Bergmann <arnd@arndb.de>
To: y2038@lists.linaro.org, Pablo Neira Ayuso <pablo@netfilter.org>,
	Jozsef Kadlecsik <kadlec@netfilter.org>,
	Florian Westphal <fw@strlen.de>,
	"David S. Miller" <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
	Ander Juaristi <a@juaristi.eus>, wenxu <wenxu@ucloud.cn>,
	Thomas Gleixner <tglx@linutronix.de>, Phil Sutter <phil@nwl.cc>,
	netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
	netdev@vger.kernel.org
Subject: [PATCH 09/16] netfilter: nft_meta: use 64-bit time arithmetic
Date: Fri,  8 Nov 2019 22:32:47 +0100
Message-ID: <20191108213257.3097633-10-arnd@arndb.de> (raw)
In-Reply-To: <20191108213257.3097633-1-arnd@arndb.de>

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.

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 <arnd@arndb.de>
---
 net/netfilter/nft_meta.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index 317e3a9e8c5b..dda1e55d5801 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -33,19 +33,19 @@
 
 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
 
-static u8 nft_meta_weekday(unsigned long secs)
+static u8 nft_meta_weekday(time64_t secs)
 {
 	unsigned int dse;
 	u8 wday;
 
 	secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest;
-	dse = secs / NFT_META_SECS_PER_DAY;
+	dse = div_u64(secs, NFT_META_SECS_PER_DAY);
 	wday = (4 + dse) % NFT_META_DAYS_PER_WEEK;
 
 	return wday;
 }
 
-static u32 nft_meta_hour(unsigned long secs)
+static u32 nft_meta_hour(time64_t secs)
 {
 	struct tm tm;
 
@@ -250,10 +250,10 @@ void nft_meta_get_eval(const struct nft_expr *expr,
 		nft_reg_store64(dest, ktime_get_real_ns());
 		break;
 	case NFT_META_TIME_DAY:
-		nft_reg_store8(dest, nft_meta_weekday(get_seconds()));
+		nft_reg_store8(dest, nft_meta_weekday(ktime_get_real_seconds()));
 		break;
 	case NFT_META_TIME_HOUR:
-		*dest = nft_meta_hour(get_seconds());
+		*dest = nft_meta_hour(ktime_get_real_seconds());
 		break;
 	default:
 		WARN_ON(1);
-- 
2.20.0


  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 ` Arnd Bergmann [this message]
2019-11-09 11:20   ` [PATCH 09/16] netfilter: nft_meta: use 64-bit time arithmetic Phil Sutter
2019-11-15 22:44   ` Pablo Neira Ayuso

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