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

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Date:	Wed, 23 Jul 2014 20:40:26 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>, wad@...omium.org,
	catalin.marinas@....com, will.deacon@....com, keescook@...omium.org
CC:	dsaxena@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] asm-generic: Add generic seccomp.h for secure
 computing mode 1

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.

--Andy
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