From: takahiro.akashi@linaro.org (AKASHI Takahiro)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 2/3] asm-generic: Add generic seccomp.h for secure computing mode 1
Date: Fri, 25 Jul 2014 17:52:17 +0900 [thread overview]
Message-ID: <53D21AC1.8050805@linaro.org> (raw)
In-Reply-To: <CALCETrV9zJ=0_kg7-zuPDUxf_uHmsf+avrd2-cypuLYhtEPt6g@mail.gmail.com>
On 07/24/2014 11:57 PM, Andy Lutomirski wrote:
> On Jul 23, 2014 10:17 PM, "AKASHI Takahiro" <takahiro.akashi@linaro.org> wrote:
>>
>> On 07/24/2014 01:41 PM, Kees Cook wrote:
>>>
>>> On Wed, Jul 23, 2014 at 8:40 PM, Andy Lutomirski <luto@amacapital.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@arndb.de>
>>>>> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.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@linaro.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
>>>
next prev parent reply other threads:[~2014-07-25 8:52 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-22 9:14 [PATCH v5 0/3] arm64: Add seccomp support AKASHI Takahiro
2014-07-22 9:14 ` [PATCH v5 1/3] arm64: ptrace: reload a syscall number after ptrace operations AKASHI Takahiro
2014-07-22 20:15 ` Kees Cook
2014-07-23 7:03 ` AKASHI Takahiro
2014-07-23 8:25 ` Will Deacon
2014-07-23 9:09 ` AKASHI Takahiro
2014-07-23 15:13 ` Kees Cook
2014-07-24 3:54 ` Andy Lutomirski
2014-07-24 5:57 ` AKASHI Takahiro
2014-07-24 15:01 ` Andy Lutomirski
2014-07-25 10:36 ` AKASHI Takahiro
2014-07-25 11:03 ` Will Deacon
2014-07-29 6:49 ` AKASHI Takahiro
2014-07-29 13:26 ` Will Deacon
2014-07-22 9:14 ` [PATCH v5 2/3] asm-generic: Add generic seccomp.h for secure computing mode 1 AKASHI Takahiro
2014-07-24 3:40 ` Andy Lutomirski
2014-07-24 4:41 ` Kees Cook
2014-07-24 5:17 ` AKASHI Takahiro
2014-07-24 14:57 ` Andy Lutomirski
2014-07-25 8:52 ` AKASHI Takahiro [this message]
2014-07-22 9:14 ` [PATCH v5 3/3] arm64: Add seccomp support AKASHI Takahiro
2014-07-24 3:52 ` Andy Lutomirski
2014-07-24 5:40 ` AKASHI Takahiro
2014-07-24 15:00 ` Andy Lutomirski
2014-07-24 15:16 ` Catalin Marinas
2014-07-25 9:37 ` AKASHI Takahiro
2014-08-05 15:08 ` Kees Cook
2014-08-08 7:35 ` AKASHI Takahiro
2014-08-11 9:24 ` Will Deacon
2014-08-12 6:57 ` AKASHI Takahiro
2014-08-12 9:40 ` Will Deacon
2014-08-12 11:17 ` AKASHI Takahiro
2014-08-15 14:33 ` Will Deacon
2014-07-22 20:16 ` [PATCH v5 0/3] " Kees Cook
2014-07-23 7:09 ` AKASHI Takahiro
2014-07-23 15:36 ` Kees Cook
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