Re: [PATCH 6.12.y] net: add missing ns_capable check for peer netns

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Jul 10, 2026 at 12:49:54PM +0000, Maximilian Heyne wrote:
> Hi Greg,
> 
> On Thu, Jun 25, 2026 at 12:37:31PM +0100, Greg KH wrote:
> > On Wed, Jun 17, 2026 at 08:25:31AM +0000, Maximilian Heyne wrote:
> > > The upstream commit 7b735ef81286 ("rtnetlink: add missing
> > > netlink_ns_capable() check for peer netns") doesn't apply on older
> > > stable kernels due to refactoring. Therefore, this patch is an attempt
> > > to implement the same capability check just directly in the respective
> > > interface types.
> > 
> > Why can't we take the full series of patches instead?  Otherwise this is
> > going to be a pain over time for any other fixes/updates in this area,
> > right?
> 
> Agree that this would be a pain. The issue is that this requires to
> backport >10 patches. I think for 6.12 it would be like 15 patches so
> that each patch doesn't need to be reworked too much.

15 is trivial, we have taken hundreds in the past :)

> The reason for me submitting this was that it's easily backports to all
> stable kernels. I haven't tested for 6.6 or earlier how many patches
> would need to be backported.
> 
> I can try to post the series for 6.12 after some more testing (after my
> vacation) but I'm think I won't succeed backporting the refactoring
> patches back to, say, 5.10.

Full series is best because maintaining this over time will be easier if
you do that, not harder.

thanks,

greg k-h