netdev - Re: [PATCH v11 net-next 12/12] bpf: mini eBPF library, test stubs and verifier testsuite

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Date:	Wed, 10 Sep 2014 13:35:18 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	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@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 net-next 12/12] bpf: mini eBPF library, test stubs
 and verifier testsuite

On 09/10/2014 07:10 AM, Alexei Starovoitov wrote:
> 1.
> the library includes a trivial set of BPF syscall wrappers:
> int bpf_create_map(int key_size, int value_size, int max_entries);
> int bpf_update_elem(int fd, void *key, void *value);
> int bpf_lookup_elem(int fd, void *key, void *value);
> int bpf_delete_elem(int fd, void *key);
> int bpf_get_next_key(int fd, void *key, void *next_key);
> int bpf_prog_load(enum bpf_prog_type prog_type,
> 		  const struct sock_filter_int *insns, int insn_len,
> 		  const char *license);
> bpf_prog_load() stores verifier log into global bpf_log_buf[] array
>
> 2.
> test stubs configure eBPF infra with 'unspec' map and program types.
> These are fake types used by user space testsuite only.
>
> 3.
> verifier tests valid and invalid programs and expects predefined
> error log messages from kernel.
> 40 tests so far.
>
> $ sudo ./test_verifier
>   #0 add+sub+mul OK
>   #1 unreachable OK
>   #2 unreachable2 OK
>   #3 out of range jump OK
>   #4 out of range jump2 OK
>   #5 test1 ld_imm64 OK
>   ...
>
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>

Since we already have an extensive BPF test suite, that is, lib/test_bpf.c,
which currently also does sanity checks for the classic BPF verifier, is
there a reason these verifier test cases cannot be extended/integrated there
as well but have to go to kernel/bpf/test_stub.c resp. samples/bpf/test_verifier.c ?
I don't like that we put testing code into kernel/bpf/ whereas we already
have a BPF test infrastructure in the kernel elsewhere.
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