Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context

Cyrill Gorcunov
2015-10-14T16:57:41Z

On Wed, Oct 14, 2015 at 09:42:58AM -0700, Andy Lutomirski wrote:
>
> That's the intent.
>
> If you write __pad = 0, don't set UC_STRICT_RESTORE_SS, and leave cs
> set to a 64-bit value, then the kernel will detect that 0 is not a
> valid SS and will fix it for you.
>
> If you do write UC_STRICT_RESTORE_SS (e.g. if you saved on a new
> kernel and you restore the saved uc_flags), then you'll get a new
> signal delivered.

Yeah, I just wanna be sure I understood the patch correctly. Thanks!

> If you're restoring a 32-bit or 16-bit context, then none of the above
> applies, but I doubt that CRIU supports that anyway.

True. I didn't implemented compat mode for criu yet, it's in todo.