Re: [PATCH v5 3/3] arm64: Add seccomp support

On Thu, Jul 24, 2014 at 04:00:03PM +0100, Andy Lutomirski wrote:

On Jul 23, 2014 10:40 PM, "AKASHI Takahiro" takahiro.akashi@linaro.org wrote:

...

when I implemented audit for arm64, the assumptions were

• If userspace is LE, then the kernel is also LE and if BE, then the kernel is BE.
• the syscall numbers and how arguments are encoded are the same btw BE and LE.

So syscall_get_arch() always return the same value.

If arm64 ever adds support for mixed-endian userspace, this could become awkward. Hmm.

I really doubt we would ever support mixed endian user space. Too many problems with translating syscalls, futexes (someone looked into this and gave up eventually).