netdev - Re: [PATCH] iptables: open eBPF programs in read only mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200326142227.fclwbiibfjym7l6m@salvia>
Date:   Thu, 26 Mar 2020 15:22:27 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Maciej Żenczykowski <zenczykowski@...il.com>
Cc:     Florian Westphal <fw@...len.de>,
        Linux Network Development Mailing List 
        <netdev@...r.kernel.org>,
        Netfilter Development Mailinglist 
        <netfilter-devel@...r.kernel.org>, Chenbo Feng <fengc@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH] iptables: open eBPF programs in read only mode

On Thu, Mar 26, 2020 at 07:16:16AM -0700, Maciej Żenczykowski wrote:
> I guess maybe we could wrap it in a
> 
> #ifdef BPF_F_RDONLY
> attr.file_flags = BPF_F_RDONLY;
> #endif
> 
> if we want to continue supporting building against pre-4.15 kernel headers...

You can probably add a cached copy of this header file to the iptables
tree via your patch like. This is done in other existing extensions to
not rely on the available kernel headers.

There is no parity between userspace iptables and kernel version, it
is good if you make sure this compiles for older kernels are still
supported.

Thank you.