netdev - Re: [PATCH v3 net-next 0/2] bpfilter

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Date:   Wed, 23 May 2018 19:33:51 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     David Miller <davem@...emloft.net>
Cc:     ast@...nel.org, daniel@...earbox.net,
        torvalds@...ux-foundation.org, luto@...capital.net,
        mcgrof@...nel.org, keescook@...omium.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH v3 net-next 0/2] bpfilter

On Wed, May 23, 2018 at 01:26:48PM -0400, David Miller wrote:
> From: Alexei Starovoitov <ast@...nel.org>
> Date: Mon, 21 May 2018 19:22:28 -0700
> 
> > v2->v3:
> > - followed Luis's suggestion and significantly simplied first patch
> >   with shmem_kernel_file_setup+kernel_write. Added kdoc for new helper
> > - fixed typos and race to access pipes with mutex
> > - tested with bpfilter being 'builtin'. CONFIG_BPFILTER_UMH=y|m both work.
> >   Interesting to see a usermode executable being embedded inside vmlinux.
> > - it doesn't hurt to enable bpfilter in .config.
> >   ip_setsockopt commands sent to usermode via pipes and -ENOPROTOOPT is
> >   returned from userspace, so kernel falls back to original iptables code
> > 
> > v1->v2:
> > this patch set is almost a full rewrite of the earlier umh modules approach
> > The v1 of patches and follow up discussion was covered by LWN:
> > https://lwn.net/Articles/749108/
> > 
> > I believe the v2 addresses all issues brought up by Andy and others.
> > Mainly there are zero changes to kernel/module.c
> > Instead of teaching module loading logic to recognize special
> > umh module, let normal kernel modules execute part of its own
> > .init.rodata as a new user space process (Andy's idea)
> > Patch 1 introduces this new helper:
> > int fork_usermode_blob(void *data, size_t len, struct umh_info *info);
> > Input:
> >   data + len == executable file
> > Output:
> >   struct umh_info {
> >        struct file *pipe_to_umh;
> >        struct file *pipe_from_umh;
> >        pid_t pid;
> >   };
> 
> Series applied, let the madness begin... :-)

Yeah, this is going to be fun :)