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SubjectRe: [PATCH v17 07/15] asm/syscall.h: add syscall_get_arch
On Thu, 29 Mar 2012 15:01:52 -0500
Will Drewry <wad@chromium.org> wrote:

> Adds a stub for a function that will return the AUDIT_ARCH_*
> value appropriate to the supplied task based on the system
> call convention.
>
> For audit's use, the value can generally be hard-coded at the
> audit-site. However, for other functionality not inlined into
> syscall entry/exit, this makes that information available.
> seccomp_filter is the first planned consumer and, as such,
> the comment indicates a tie to HAVE_ARCH_SECCOMP_FILTER. That

Should be "CONFIG_HAVE_ARCH_SECCOMP_FILTER", I hope.

> is probably an unneeded detail.
>
> ...
>
> --- a/include/asm-generic/syscall.h
> +++ b/include/asm-generic/syscall.h
> @@ -142,4 +142,18 @@ void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
> unsigned int i, unsigned int n,
> const unsigned long *args);
>
> +/**
> + * syscall_get_arch - return the AUDIT_ARCH for the current system call
> + * @task: task of interest, must be in system call entry tracing
> + * @regs: task_pt_regs() of @task
> + *
> + * Returns the AUDIT_ARCH_* based on the system call convention in use.
> + *
> + * It's only valid to call this when @task is stopped on entry to a system
> + * call, due to %TIF_SYSCALL_TRACE, %TIF_SYSCALL_AUDIT, or %TIF_SECCOMP.
> + *
> + * Note, at present this function is only required with
> + * CONFIG_HAVE_ARCH_SECCOMP_FILTER.
> + */
> +int syscall_get_arch(struct task_struct *task, struct pt_regs *regs);
> #endif /* _ASM_SYSCALL_H */

So architectures which permit CONFIG_HAVE_ARCH_SECCOMP_FILTER must
provide an implementation of this.



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