netdev - Re: [PATCH v1] netfilter: nf_tables: fix nft_set_elem

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Message-ID: <YsCVB2Jh8d6mM6f7@salvia>
Date:   Sat, 2 Jul 2022 20:57:11 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Hugues ANGUELKOV <hanguelkov@...dorisec.fr>
Cc:     netdev@...r.kernel.org, security@...nel.org, kadlec@...filter.org,
        fw@...len.de, davy <davy@...dorisec.fr>, amongodin@...dorisec.fr,
        kuba@...nel.org, torvalds@...uxfoundation.org,
        netfilter-devel@...r.kernel.org
Subject: Re: [PATCH v1] netfilter: nf_tables: fix nft_set_elem_init heap
 buffer overflow

On Sat, Jul 02, 2022 at 07:59:11PM +0200, Hugues ANGUELKOV wrote:
> From d91007a18140e02a1f12c9627058a019fe55b8e6 Mon Sep 17 00:00:00 2001
> From: Arthur Mongodin <amongodin@...dorisec.fr>
> Date: Sat, 2 Jul 2022 17:11:48 +0200
> Subject: [PATCH v1] netfilter: nf_tables: fix nft_set_elem_init heap buffer
>  overflow
> 
> The length used for the memcpy in nft_set_elem_init may exceed the bound
> of the allocated object due to a weak check in nft_setelem_parse_data.
> As a user can add an element with a data type NFT_DATA_VERDICT to a set
> with a data type different of NFT_DATA_VERDICT, then the comparison on the
> data type of the element allows to avoid the comparaison on the data length
> This fix forces the length comparison in nft_setelem_parse_data by removing
> the check for NFT_DATA_VERDICT type.

https://patchwork.ozlabs.org/project/netfilter-devel/patch/20220702021631.796822-1-pablo@netfilter.org/