linux-kernel - Re: [PATCH v5 2/3] asm-generic: Add generic seccomp.h for secure computing mode 1

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Message-ID: <53D21AC1.8050805@linaro.org>
Date:	Fri, 25 Jul 2014 17:52:17 +0900
From:	AKASHI Takahiro <takahiro.akashi@...aro.org>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Deepak Saxena <dsaxena@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	linaro-kernel@...ts.linaro.org,
	LKML <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 2/3] asm-generic: Add generic seccomp.h for secure
 computing mode 1

On 07/24/2014 11:57 PM, Andy Lutomirski wrote:
> On Jul 23, 2014 10:17 PM, "AKASHI Takahiro" <takahiro.akashi@...aro.org> wrote:
>>
>> On 07/24/2014 01:41 PM, Kees Cook wrote:
>>>
>>> On Wed, Jul 23, 2014 at 8:40 PM, Andy Lutomirski <luto@...capital.net> wrote:
>>>>
>>>> On 07/22/2014 02:14 AM, AKASHI Takahiro wrote:
>>>>>
>>>>>
>>>>> Those values (__NR_seccomp_*) are used solely in secure_computing()
>>>>> to identify mode 1 system calls. If compat system calls have different
>>>>> syscall numbers, asm/seccomp.h may override them.
>>>>>
>>>>> Acked-by: Arnd Bergmann <arnd@...db.de>
>>>>> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
>>>>> ---
>>>>>     include/asm-generic/seccomp.h |   28 ++++++++++++++++++++++++++++
>>>>>     1 file changed, 28 insertions(+)
>>>>>     create mode 100644 include/asm-generic/seccomp.h
>>>>>
>>>>> diff --git a/include/asm-generic/seccomp.h b/include/asm-generic/seccomp.h
>>>>> new file mode 100644
>>>>> index 0000000..5e97022
>>>>> --- /dev/null
>>>>> +++ b/include/asm-generic/seccomp.h
>>>>> @@ -0,0 +1,28 @@
>>>>> +/*
>>>>> + * include/asm-generic/seccomp.h
>>>>> + *
>>>>> + * Copyright (C) 2014 Linaro Limited
>>>>> + * Author: AKASHI Takahiro <takahiro.akashi@...aro.org>
>>>>> + *
>>>>> + * This program is free software; you can redistribute it and/or modify
>>>>> + * it under the terms of the GNU General Public License version 2 as
>>>>> + * published by the Free Software Foundation.
>>>>> + */
>>>>> +#ifndef _ASM_GENERIC_SECCOMP_H
>>>>> +#define _ASM_GENERIC_SECCOMP_H
>>>>> +
>>>>> +#include <asm-generic/unistd.h>
>>>>> +
>>>>> +#if defined(CONFIG_COMPAT) && !defined(__NR_seccomp_read_32)
>>>>> +#define __NR_seccomp_read_32           __NR_read
>>>>> +#define __NR_seccomp_write_32          __NR_write
>>>>> +#define __NR_seccomp_exit_32           __NR_exit
>>>>> +#define __NR_seccomp_sigreturn_32      __NR_rt_sigreturn
>>>>> +#endif /* CONFIG_COMPAT && ! already defined */
>>>>> +
>>>>> +#define __NR_seccomp_read              __NR_read
>>>>> +#define __NR_seccomp_write             __NR_write
>>>>> +#define __NR_seccomp_exit              __NR_exit
>>>>> +#define __NR_seccomp_sigreturn         __NR_rt_sigreturn
>>>>
>>>>
>>>>
>>>> I don't like these names.  __NR_seccomp_read sounds like the number of a
>>>> syscall called seccomp_read.
>>>>
>>>> Also, shouldn't something be including this header?  I'm confused.
>>>
>>>
>>> Ah! Good catch. These names are correct (see kernel/seccomp.c's
>>> mode1_syscalls and mode1_syscalls_32 arrays), but the location of this
>>> change was unexpected. I was expecting this file to live in
>>> arch/*/include/asm/seccomp.h, not in include/asm-generic/seccomp.h.
>>>
>>> However, since it's always the same list, it might make sense to
>>> consolidate them into a single place as a default to make arch porting
>>> easier.
>>
>>
>> Yeah, that is why I put this file under include/asm-generic.
>
> It seems odd that the header would be added without any users.  I
> guess it's okay, since arm64 uses it in the followup patch.
>
>>
>>> However, I think that should be a separate patch.
>>
>>
>> Do you mean that the code for all the existing archs should also be changed
>> to use this (common) header?
>
> If that works, yes.

As is often the case, the patch itself is quite simple, but I can't
test it on other architectures.

-Takahiro AKASHI

> --Andy
>
>>
>> -Takahiro AKASHI
>>>
>>>
>>> -Kees
>>>
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