linux-kernel - Re: [PATCH v11 net-next 00/12] eBPF syscall, verifier, testsuite

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Message-ID: <CAMEtUuyTfRwZi1-yOyrAOkubWLDLC6YZXUq8OFpqXpHPjKRYhw@mail.gmail.com>
Date:	Thu, 11 Sep 2014 13:35:31 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...uxfoundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 net-next 00/12] eBPF syscall, verifier, testsuite

On Thu, Sep 11, 2014 at 12:54 PM, Daniel Borkmann <dborkman@...hat.com> wrote:
> On 09/10/2014 10:21 PM, Alexei Starovoitov wrote:
> ...
>>>>
>>>>                char bpf_log_buf[LOG_BUF_SIZE];
>>>
>>>
>>> What happens if the size isn't LOG_BUF_SIZE?
>>
>>
>> would do you mean?
>> LOG_BUF_SIZE is just a user defined macro.
>> Can be anything.
>
> I believe, Andy means, what would happen if log_level > 0 but
> the log_size is not big enough so that the human-readable error
> text string from the verifier will fit into it? I presume that
> will be truncated then ... hm.

Correct. It will be truncated and ENOSPC returned from syscall.
Just noticed that I didn't mention that in the manpage... will do.
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