Re: [PATCH v2] netfilter: nfacct: Fix alignment mismatch in xt_nfacct_match_info

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On Fri, Aug 16, 2019 at 05:02:22PM +0200, Juliana Rodrigueiro wrote:
> When running a 64-bit kernel with a 32-bit iptables binary, the size of
> the xt_nfacct_match_info struct diverges.
> 
>     kernel: sizeof(struct xt_nfacct_match_info) : 40
>     iptables: sizeof(struct xt_nfacct_match_info)) : 36
> 
> Trying to append nfacct related rules results in an unhelpful message.
> Although it is suggested to look for more information in dmesg, nothing
> can be found there.
> 
>     # iptables -A <chain> -m nfacct --nfacct-name <acct-object>
>     iptables: Invalid argument. Run `dmesg' for more information.
> 
> This patch fixes the memory misalignment by enforcing 8-byte alignment
> within the struct's first revision. This solution is often used in many
> other uapi netfilter headers.

Applied, thanks.

Please, send us the userspace chunk for iptables. Thanks again.



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