netdev - Re: [PATCH v2] netfilter: nf_tables: prevent OOB access in nft_byteorder

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Message-ID: <20230705212929.GI3751@breakpoint.cc>
Date: Wed, 5 Jul 2023 23:29:29 +0200
From: Florian Westphal <fw@...len.de>
To: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Cc: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Florian Westphal <fw@...len.de>
Subject: Re: [PATCH v2] netfilter: nf_tables: prevent OOB access in
 nft_byteorder_eval

Thadeu Lima de Souza Cascardo <cascardo@...onical.com> wrote:
> When evaluating byteorder expressions with size 2, a union with 32-bit and
> 16-bit members is used. Since the 16-bit members are aligned to 32-bit,
> the array accesses will be out-of-bounds.
> 
> It may lead to a stack-out-of-bounds access like the one below:

Reviewed-by: Florian Westphal <fw@...len.de>