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

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Date:	Tue, 29 Mar 2016 22:06:37 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Matt Redfearn <matt.redfearn@...tec.com>
Cc:	IMG-MIPSLinuxKerneldevelopers@...tec.com,
	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 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

-- 
Kees Cook
Chrome OS & Brillo Security