linux-kernel - Re: [PATCH v4 net-next 5/5] net: filter: split 'struct sk

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]

Date:	Fri, 1 Aug 2014 12:12:36 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Kees Cook <keescook@...omium.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>
Subject: Re: [PATCH v4 net-next 5/5] net: filter: split 'struct sk_filter'
 into socket and bpf parts

On Fri, Aug 1, 2014 at 12:03 PM, Pablo Neira Ayuso <pablo@...filter.org> wrote:
>> > I think you can allocate the sk_filter once you get the final bpf
>> > program, then you can memcpy() it. This adds some extra overhead in
>> > the sk_attach_filter(), but that path is executed from user context
>> > and it's also a rare operation (only once to attach the filter). It's
>> > still not going to be a beauty, but IMO it's worth to focus on getting
>> > that little speed up in the packet path at the cost of adding some
>> > overhead on the socket attach path.
>>
>> memcpy of 'bpf_prog' is not just 'not a beauty', it won't work, since
>> bpf_prog is freed via work_queue due to JIT. See bpf_jit_free()
> [...]
>
> I see, in this patch you renamed sk_filter to bpf_prog in
> bpf_jit_free() so no access to sk_filter anymore and alignment needs a
> closer look.
>
> OK... let's stick to the struct bpf_prog pointer.

great. Once nft comes along we can always revisit this bit.

Dave, this patch has trivial conflict with Daniel's
("team: fix releasing uninitialized pointer to BPF prog") fix.
Let me know if you want me to respin the series or you'll patch up
the conflict yourself.

Thanks
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/