From: Florian Westphal <fw@strlen.de>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: netfilter-devel@vger.kernel.org, Jeremy.Jean@oss.cyber.gouv.fr
Subject: Re: [PATCH nf] netfilter: nft_set_rbtree: narrow down range completion to anonymous sets
Date: Thu, 8 Oct 2026 08:32:54 +0200 [thread overview]
Message-ID: <asc5Bsrgv_w7lVOq@strlen.de> (raw)
In-Reply-To: <20261007220358.1140284-1-pablo@netfilter.org>
Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> For anonymous sets, when adjacent ranges are found, the end element is
> not added to the set to pack the set representation. Use next start
> element to complete this interval.
>
> Jérémy Jean says:
>
> Consider two ranges in a netfilter verdict map:
> * keys 10-19 accept packets, and
> * keys 30-39 jump to chain 'victim'.
> Now, delete the end marker at 20. The lookup array now uses element 30
> as the first range's end, so an INTERVAL_END query for key 15 returns
> element 30, including its jump verdict and chain pointer. This can make
> KASAN reports a UAF after the GC releases reference chain for 30 that
> has expired:
Dumb question: How is it possible to remove an element if the map is
anonymous?
next prev parent reply other threads:[~2026-10-08 6:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-07 22:03 [PATCH nf] netfilter: nft_set_rbtree: narrow down range completion to anonymous sets Pablo Neira Ayuso
2026-10-08 6:32 ` Florian Westphal [this message]
2026-10-08 10:52 ` Pablo Neira Ayuso
2026-10-08 10:52 ` Pablo Neira Ayuso
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