linux-kernel - Re: [PATCH v10 05/11] seccomp: add system call filtering using BPF

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Message-ID: <4F448C13.1040407@zytor.com>
Date:	Tue, 21 Feb 2012 22:32:51 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Will Drewry <wad@...omium.org>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
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	keescook@...omium.org
Subject: Re: [PATCH v10 05/11] seccomp: add system call filtering using BPF

On 02/21/2012 09:30 AM, Will Drewry wrote:
> +
> +/**
> + * struct seccomp_data - the format the BPF program executes over.
> + * @args: up to 6 system call arguments.  When the calling convention is
> + *        32-bit, the arguments will still be at each args[X] offset.
> + * @instruction_pointer: at the time of the system call.
> + * @arch: indicates system call convention as an AUDIT_ARCH_* value
> + *        as defined in <linux/audit.h>.
> + * @nr: the system call number
> + */
> +struct seccomp_data {
> +	__u64 args[6];
> +	__u64 instruction_pointer;
> +	__u32 arch;
> +	int nr;
> +};
>  

This got flipped around for some reason... that is a problem if we ever
need to extend this to more than 6 arguments (I thought we had at least
one architecture which supported 7 arguments already, but I could just
be delusional.)

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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