linux-kernel - Re: [PATCH v2 0/6] MIPS seccomp

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Date:	Thu, 31 Mar 2016 09:57:33 +0100
From:	Matt Redfearn <matt.redfearn@...tec.com>
To:	Kees Cook <keescook@...omium.org>
CC:	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	Arnd Bergmann <arnd@...db.de>,
	Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Shuah Khan <shuahkh@....samsung.com>,
	"Eric B Munson" <emunson@...mai.com>,
	James Hogan <james.hogan@...tec.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kselftest@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Markos Chandras <markos.chandras@...tec.com>,
	Amanieu d'Antras <amanieu@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Alex Smith <alex.smith@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Will Drewry <wad@...omium.org>
Subject: Re: [PATCH v2 0/6] MIPS seccomp_bpf self test and fixups



On 30/03/16 06:06, Kees Cook wrote:
> On Tue, Mar 29, 2016 at 1:35 AM, Matt Redfearn <matt.redfearn@...tec.com> wrote:
>> These patches imporve seccomp support on MIPS.
>>
>> Firstly support is added for building the seccomp_bpf self test for
>> MIPS. The
>> initial results of these tests were:
>>
>> 32bit kernel O32 userspace before: 48 / 48 pass
>> 64bit kernel O32 userspace before: 47 / 48 pass
>>   Failures: TRAP.Handler
>> 64bit kernel N32 userspace before: 44 / 48 pass
>>   Failures: global.mode_strict_support, TRAP.handler,
>> TRACE_syscall.syscall_redirected, TRACE_syscall.syscall_dropped
>> 64bit kernel N64 userspace before: 46 / 48 pass
>>   Failures: TRACE_syscall.syscall_redirected,
>> TRACE_syscall.syscall_dropped
>>
>> The subsequent patches fix issues that were causing the above tests to
>> fail. With
>> these fixes, the results are:
>> 32bit kernel O32 userspace after: 48 / 48
>> 64bit kernel O32 userspace after: 48 / 48
>> 64bit kernel N32 userspace after: 48 / 48
>> 64bit kernel N64 userspace after: 48 / 48
>>
>> Thanks,
>> Matt
>>
>> Changes in v2:
>> - Tested on additional platforms
>> - Replace __NR_syscall which isn't defined for N32 / N64 ABIs
>>
>> Matt Redfearn (6):
>>    selftests/seccomp: add MIPS self-test support
>>    MIPS: Support sending SIG_SYS to 32bit userspace from 64bit kernel
>>    MIPS: scall: Handle seccomp filters which redirect syscalls
>>    seccomp: Get compat syscalls from asm-generic header
>>    MIPS: seccomp: Support compat with both O32 and N32
>>    secomp: Constify mode1 syscall whitelist
>>
>>   arch/mips/include/asm/seccomp.h               | 47 +++++++++++++++------------
>>   arch/mips/kernel/scall32-o32.S                | 11 +++----
>>   arch/mips/kernel/scall64-64.S                 |  3 +-
>>   arch/mips/kernel/scall64-n32.S                | 14 +++++---
>>   arch/mips/kernel/scall64-o32.S                | 14 +++++---
>>   arch/mips/kernel/signal32.c                   |  6 ++++
>>   include/asm-generic/seccomp.h                 | 14 ++++++++
>>   kernel/seccomp.c                              | 13 ++------
>>   tools/testing/selftests/seccomp/seccomp_bpf.c | 30 +++++++++++++++--
>>   9 files changed, 101 insertions(+), 51 deletions(-)
> Thanks for digging into this! Consider all the seccomp pieces:
>
> Acked-by: Kees Cook <keescook@...omium.org>
>
> Probably best to carry it all in the MIPS tree, but if you want to me
> take pieces of it into my seccomp tree, I can do that. Up to you. :)
>
> -Kees
>
Thanks Kees. Ralf is going to take it via the MIPS tree.

Matt