linux-kernel - Re: [PATCH] selftests: add seccomp suite

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Date:	Wed, 17 Jun 2015 17:25:59 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Kees Cook <keescook@...omium.org>,
	Michael Ellerman <mpe@...erman.id.au>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	"David S. Miller" <davem@...emloft.net>,
	Arnd Bergmann <arnd@...db.de>, Joe Perches <joe@...ches.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Linux API <linux-api@...r.kernel.org>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH] selftests: add seccomp suite

On 06/17/2015 12:12 PM, Kees Cook wrote:
> On Wed, Jun 17, 2015 at 12:31 AM, Michael Ellerman <mpe@...erman.id.au> wrote:
>> On Tue, 2015-06-16 at 10:54 -0700, Kees Cook wrote:
>>> This imports the existing seccomp test suite into the kernel's selftests
>>> tree. It contains extensive testing of seccomp features and corner cases.
>>> There remain additional tests to move into the kernel tree, but they have
>>> not yet been ported to all the architectures seccomp supports:
>>> https://github.com/redpig/seccomp/tree/master/tests
>>>
>>> Signed-off-by: Kees Cook <keescook@...omium.org>
>>> ---
>>>  MAINTAINERS                                    |    1 +
>>>  tools/testing/selftests/Makefile               |    1 +
>>>  tools/testing/selftests/seccomp/.gitignore     |    1 +
>>>  tools/testing/selftests/seccomp/Makefile       |   10 +
>>>  tools/testing/selftests/seccomp/seccomp_bpf.c  | 2109 ++++++++++++++++++++++++
>>>  tools/testing/selftests/seccomp/test_harness.h |  537 ++++++
>>
>>
>> Thanks very much for adding this, it would have been very helpful recently when
>> I was trying to get seccomp filter working on powerpc :)
>>
>> I get one failure in TRACE_syscall.syscall_dropped:
>>
>>   seccomp_bpf.c:1394:TRACE_syscall.syscall_dropped:Expected 1 (1) == syscall(207) (18446744073709551615)
>>
>>
>> So it looks like we're returning -1 instead of 1.
>>
>> That's probably a bug in our handling of the return value, or maybe an
>> inconsistency across the arches. I'll try and find time to dig into it.
> 
> Ah-ha! Excellent. Did you add an implementation for change_syscall()
> in seccomp_bpf.c? I don't have a powerpc method in there. I would have
> expected both TRACE_syscall.syscall_redirected and .syscall_dropped to
> fail without that.
> 
> If you did, maybe something isn't right with regs.SYSCALL_RET ? That's
> where the return value being tested on a skipped syscall is stored.
> 
> Thanks for testing!
> 

Thanks for the test. Fantastic to see so many positive responses
to this addition. Thanks Michael for testing it. It is now queued
for 4.2 in linux-kselftest next

thanks,
-- Shuah


-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
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