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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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