Luoqi Chen wrote:
> > o restoring %gs is now handled in the proper sigreturn.
>
> Restoration of %gs should not be in the kernel because it comes from
> user application and maybe invalid, if you restore it inside the kernel
> it could be fatal to the whole system, and on the other hand just a core
> dump if done in the trampoline code which is still in user mode.
Hmmm... What if the application passes a (possibly handcrafted)
sigcontext to an explicit call to sigreturn. %gs should be restored in
that case too, right?
Isn't it therefore better to have %gs in the trapframe?
--
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