netdev - Re: [PATCH net] xen-netfront: Add missing skb_mark_for

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Date: Tue, 2 Apr 2024 22:25:13 +0200
From: Arthur Borsboom <arthurborsboom@...il.com>
To: Jesper Dangaard Brouer <hawk@...nel.org>
Cc: netdev@...r.kernel.org, Ilias Apalodimas <ilias.apalodimas@...aro.org>, wei.liu@...nel.org, 
	paul@....org, Jakub Kicinski <kuba@...nel.org>, kirjanov@...il.com, dkirjanov@...e.de, 
	kernel-team@...udflare.com, security@...project.org, 
	andrew.cooper3@...rix.com, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH net] xen-netfront: Add missing skb_mark_for_recycle

After having a better look, I have found the patch in linux-next

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=0cd74ffcf4fb0536718241d59d2c124578624d83

On Tue, 2 Apr 2024 at 10:20, Arthur Borsboom <arthurborsboom@...il.com> wrote:
>
> On Fri, 29 Mar 2024 at 10:47, Arthur Borsboom <arthurborsboom@...il.com> wrote:
> >
> > On Wed, 27 Mar 2024 at 13:15, Jesper Dangaard Brouer <hawk@...nel.org> wrote:
> > >
> > > Notice that skb_mark_for_recycle() is introduced later than fixes tag in
> > > 6a5bcd84e886 ("page_pool: Allow drivers to hint on SKB recycling").
> > >
> > > It is believed that fixes tag were missing a call to page_pool_release_page()
> > > between v5.9 to v5.14, after which is should have used skb_mark_for_recycle().
> > > Since v6.6 the call page_pool_release_page() were removed (in 535b9c61bdef
> > > ("net: page_pool: hide page_pool_release_page()") and remaining callers
> > > converted (in commit 6bfef2ec0172 ("Merge branch
> > > 'net-page_pool-remove-page_pool_release_page'")).
> > >
> > > This leak became visible in v6.8 via commit dba1b8a7ab68 ("mm/page_pool: catch
> > > page_pool memory leaks").
> > >
> > > Fixes: 6c5aa6fc4def ("xen networking: add basic XDP support for xen-netfront")
> > > Reported-by: Arthur Borsboom <arthurborsboom@...il.com>
> > > Signed-off-by: Jesper Dangaard Brouer <hawk@...nel.org>
> > > ---
> > > Compile tested only, can someone please test this
> >
> > I have tested this patch on Xen 4.18.1 with VM (Arch Linux) kernel 6.9.0-rc1.
> >
> > Without the patch there are many trace traces and cloning the Linux
> > mainline git repository resulted in failures (same with kernel 6.8.1).
> > The patched kernel 6.9.0-rc1 performs as expected; cloning the git
> > repository was successful and no kernel traces observed.
> > Hereby my tested by:
> >
> > Tested-by: Arthur Borsboom <arthurborsboom@...il.com>
> >
> >
> >
> > >  drivers/net/xen-netfront.c |    1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> > > index ad29f370034e..8d2aee88526c 100644
> > > --- a/drivers/net/xen-netfront.c
> > > +++ b/drivers/net/xen-netfront.c
> > > @@ -285,6 +285,7 @@ static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue)
> > >                 return NULL;
> > >         }
> > >         skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE);
> > > +       skb_mark_for_recycle(skb);
> > >
> > >         /* Align ip header to a 16 bytes boundary */
> > >         skb_reserve(skb, NET_IP_ALIGN);
> > >
> > >
>
> I don't see this patch yet in linux-next.
>
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log
>
> Any idea in which kernel release this patch will be included?