From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Florian Westphal <fw@strlen.de>
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 12:52:32 +0200 [thread overview]
Message-ID: <asd18Ow3-mYwVQMS@chamomile> (raw)
In-Reply-To: <asc5Bsrgv_w7lVOq@strlen.de>
On Thu, Oct 08, 2026 at 08:32:54AM +0200, Florian Westphal wrote:
> 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?
I suspect this is a strange combination which cannot be reached from
userspace.
next prev parent reply other threads:[~2026-10-08 10:52 UTC|newest]
Thread overview: 5+ 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
2026-10-08 10:52 ` Pablo Neira Ayuso [this message]
2026-10-08 10:52 ` Pablo Neira Ayuso
2026-10-10 8:46 ` Florian Westphal
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=asd18Ow3-mYwVQMS@chamomile \
--to=pablo@netfilter.org \
--cc=Jeremy.Jean@oss.cyber.gouv.fr \
--cc=fw@strlen.de \
--cc=netfilter-devel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox