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

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Message-ID: <5411FDE1.3060302@redhat.com>
Date:	Thu, 11 Sep 2014 21:54:09 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Alexei Starovoitov <ast@...mgrid.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 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.

> it's passed along with pointer:
>                         .log_buf = bpf_log_buf,
>                         .log_size = LOG_BUF_SIZE,
>                         .log_level = 1,
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