On Sat, Jun 23, 2018 at 10:57:06AM +0900, David Miller wrote:
> From: Paul Moore <pmoore@xxxxxxxxxx>
> Date: Fri, 22 Jun 2018 17:18:20 -0400
>
> > - const mm_segment_t old_fs = get_fs();
> > -
> > - set_fs(KERNEL_DS);
> > - ret_val = ipv6_renew_options(sk, opt, newtype,
> > - (struct ipv6_opt_hdr __user *)newopt,
> > - newoptlen);
> > - set_fs(old_fs);
>
> So is it really the case that the traditional construct:
>
> set_fs(KERNEL_DS);
> ... copy_{from,to}_user(...);
> set_fs(old_fs);
>
> is no longer allowed?
s/no longer allowed/best avoided/, but IMO in this case the replacement is
too ugly to live ;-/
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