netfilter: arp_tables: fix invoking 32bit "iptable -P INPUT ACCEPT" failed in 64bit...
authorHongxu Jia <hongxu.jia@windriver.com>
Wed, 30 Nov 2016 02:56:26 +0000 (21:56 -0500)
committerPablo Neira Ayuso <pablo@netfilter.org>
Wed, 30 Nov 2016 19:50:23 +0000 (20:50 +0100)
commit17a49cd549d9dc8707dc9262210166455c612dde
tree53e17f40ba58680fba0dcc8a6673dc355512b042
parent9b57da0630c9fd36ed7a20fc0f98dc82cc0777fa
netfilter: arp_tables: fix invoking 32bit "iptable -P INPUT ACCEPT" failed in 64bit kernel

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@qemux86-64:~# arptables -P INPUT ACCEPT
root@qemux86-64:~# 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@windriver.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
net/ipv4/netfilter/arp_tables.c