linux-kernel - Re: [RFC] net: esp: fix bad handling of pages from page

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Message-ID: <20240305190427.757b92b8@kernel.org>
Date: Tue, 5 Mar 2024 19:04:27 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Dragos Tatulea <dtatulea@...dia.com>
Cc: Steffen Klassert <steffen.klassert@...unet.com>, Herbert Xu
 <herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net>,
 "David Ahern" <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, <leonro@...dia.com>, <gal@...dia.com>,
 "Anatoli N . Chechelnickiy" <Anatoli.Chechelnickiy@...nterpipe.biz>, Ian
 Kumlien <ian.kumlien@...il.com>, <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, Mina Almasry <almasrymina@...gle.com>
Subject: Re: [RFC] net: esp: fix bad handling of pages from page_pool

On Mon, 4 Mar 2024 11:48:52 +0200 Dragos Tatulea wrote:
> When the skb is reorganized during esp_output (!esp->inline), the pages
> coming from the original skb fragments are supposed to be released back
> to the system through put_page. But if the skb fragment pages are
> originating from a page_pool, calling put_page on them will trigger a
> page_pool leak which will eventually result in a crash.

So it just does: skb_shinfo(skb)->nr_frags = 1;
and assumes that's equivalent to owning a page ref on all the frags?

Fix looks more or less good, we would need a new wrapper to avoid
build issues without PAGE_POOL, but I wonder if we wouldn't be better
off changing the other side. Instead of "cutting off" the frags -
walking them and dealing with various page types. Because Mina and co.
will step onto this landmine as well.