linux-kernel - Re: [PATCH 0/4] Seccomp filter JIT support on ARM.

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Message-ID: <55422564.2030106@iogearbox.net>
Date:	Thu, 30 Apr 2015 14:51:48 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Nicolas Schichan <nschichan@...ebox.fr>
CC:	Will Drewry <wad@...omium.org>, Kees Cook <keescook@...omium.org>,
	linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Mircea Gherzan <mgherzan@...il.com>,
	Russell King <linux@....linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	linux-arm-kernel@...ts.infradead.org, ast@...mgrid.com
Subject: Re: [PATCH 0/4] Seccomp filter JIT support on ARM.

On 04/30/2015 02:35 PM, Nicolas Schichan wrote:
> On 04/29/2015 06:37 PM, Daniel Borkmann wrote:
>> On 04/29/2015 03:37 PM, Nicolas Schichan wrote:
>> ...
>>> The fourth and final patch fixes a bug in the emit_udiv() function
>>> when used to convert a BPF_ALU | BPF_DIV | BPF_K instruction in the
>>> ARM BPF JIT code.
>>
>> Shouldn't that fix go separately, so it can be included into 4.1
>> resp. -stable?
>
> Sure, shall I resend that separately from the v2 of the serie or is it fine in
> its current form ?

Would be great if you could send that as an individual patch, since
it's a stand-alone fix and independent from the (feature) patch set.

>> Would be good if you also Cc Mircea, who wrote the code. Was that
>> caught by lib/test_bpf.c suite (if not, would be good to add a test
>> case for it) ?
>
> It was detected by an internal test suite we have here. I see that there are
> some BPF_ALU | BPF_DIV | BPF_K instructions so it might also be caught by
> lib/test_bpf.c as well.

If there are some additional tests that are not yet covered by lib/test_bpf.c,
I'd be happy if you could add them there. This can also be as a follow-up,
but if we can increase coverage for others as well, the better.

Thanks again,
Daniel
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