linux-kernel - [PATCH 3.16 267/306] netfilter: arp_tables: fix invoking 32bit "iptable -P INPUT ACCEPT" failed in 64bit kernel

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Message-ID: <lsq.1487198500.796441073@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Florian Westphal" <fw@...len.de>,
        "Hongxu Jia" <hongxu.jia@...driver.com>,
        "Pablo Neira Ayuso" <pablo@...filter.org>
Subject: [PATCH 3.16 267/306] netfilter: arp_tables: fix invoking 32bit
 "iptable -P INPUT ACCEPT" failed in 64bit kernel

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hongxu Jia <hongxu.jia@...driver.com>

commit 17a49cd549d9dc8707dc9262210166455c612dde upstream.

Since 09d9686047db ("netfilter: x_tables: do compat validation via
translate_table"), it used compatr structure to assign newinfo
structure.  In translate_compat_table of ip_tables.c and ip6_tables.c,
it used compatr->hook_entry to replace info->hook_entry and
compatr->underflow to replace info->underflow, but not do the same
replacement in arp_tables.c.

It caused invoking 32-bit "arptbale -P INPUT ACCEPT" failed in 64bit
kernel.
--------------------------------------
root@...ux86-64:~# arptables -P INPUT ACCEPT
root@...ux86-64:~# arptables -P INPUT ACCEPT
ERROR: Policy for `INPUT' offset 448 != underflow 0
arptables: Incompatible with this kernel
--------------------------------------

Fixes: 09d9686047db ("netfilter: x_tables: do compat validation via translate_table")
Signed-off-by: Hongxu Jia <hongxu.jia@...driver.com>
Acked-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/ipv4/netfilter/arp_tables.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1332,8 +1332,8 @@ static int translate_compat_table(struct
 
 	newinfo->number = compatr->num_entries;
 	for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
-		newinfo->hook_entry[i] = info->hook_entry[i];
-		newinfo->underflow[i] = info->underflow[i];
+		newinfo->hook_entry[i] = compatr->hook_entry[i];
+		newinfo->underflow[i] = compatr->underflow[i];
 	}
 	entry1 = newinfo->entries[raw_smp_processor_id()];
 	pos = entry1;