netdev - Re: [PATCH net-next] netfilter: xt_quota: fix the behavior of xt

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Message-ID: <CANP3RGdRD5cQGRthBSx0HDVesf7aSBj0gxBwGxvuXrhZfKfYmw@mail.gmail.com>
Date:   Wed, 3 Oct 2018 02:26:05 -0700
From:   Maciej Żenczykowski <maze@...gle.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Chenbo Feng <chenbofeng.kernel@...il.com>,
        Linux NetDev <netdev@...r.kernel.org>,
        netfilter-devel@...r.kernel.org, kernel-team@...roid.com,
        Lorenzo Colitti <lorenzo@...gle.com>,
        Chenbo Feng <fengc@...gle.com>
Subject: Re: [PATCH net-next] netfilter: xt_quota: fix the behavior of
 xt_quota module

While on a 32-bit arch the tail pointer is 32 bits, the struct itself
contains (and has always contained) a 64-bit value 'quota' with a
forced 64-bit alignment which forces 64-bit alignment of the entire
struct and thus also forces tail padding to make it a multiple of
64-bits.  ie. size doesn't change - even on 32 bits.

Chenbo was testing compatibility on both 32 and 64 bit x86 VMs.