netdev - Re: [PATCH net] netlink: fix wrong subscription bitmask to group mapping in binding callbacks

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Message-Id: <20150108.200429.1274496391828010187.davem@davemloft.net>
Date:	Thu, 08 Jan 2015 20:04:29 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	pablo@...filter.org
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net] netlink: fix wrong subscription bitmask to group
 mapping in binding callbacks

From: Pablo Neira Ayuso <pablo@...filter.org>
Date: Wed,  7 Jan 2015 13:31:55 +0100

> The subscription bitmask passed via struct sockaddr_nl is converted to
> the group number when calling the netlink_bind() and netlink_unbind()
> callbacks.
> 
> The conversion is however incorrect since bitmask (1 << 0) needs to be
> mapped to group number 1. Note that you cannot specify the group number 0
> (usually known as _NONE) from setsockopt() using NETLINK_ADD_MEMBERSHIP
> since this is rejected through -EINVAL.
> 
> This problem became noticeable since 97840cb ("netfilter: nfnetlink:
> fix insufficient validation in nfnetlink_bind") when binding to bitmask
> (1 << 0) in ctnetlink.
> 
> Reported-by: Andre Tomt <andre@...t.net>
> Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>

This gets rejects when I try to apply it to 'net', please
respin.

Thanks.
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