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Are we going to use "emergency stack" for SYSENTER?

hi,

I just found the code in 2.6.17 under function enable_sep_cpu, which
is going to setup the esp1 as "tss->esp1 = sizeof(struct tss_struct) +
(unsigned long) tss;", which will be used as a privilege stack when
calling sysenter.

I noticed that there is unsigned long stack[64] at the bottom of
struct tss_struct, which works as an emergency stack. Are we just
going to use that once as the kernel stack for sysenter? If yes, will
that be a problem since the stack is only 256 bytes?

Thanks,
Neo

--
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!

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