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

From: "H. Peter Anvin" <[email-masked]>
Date: Tue, 21 Feb 2012 22:32:51 -0800

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.