Re: + fully-honor-vdso_enabled.patch added to -mm tree

[John Reiser]

Oleg Nesterov wrote:

> Still, I don't understand why we don't pass NEW_AUX_ENT(AT_SYSINFO) when
> vdso_enabled == 0. We don't need linux-gate.so to use __kernel_vsyscall,
> we have FIX_VDSO. In that case we should s/PAGE_KERNEL_RO/PAGE_READONLY/
> of course. I guess the reason is some magic in glibc.

In the past there were problems where user code could not single-step
(or even read the code of) such system calls.  Can these two operations
be performed today with what you propose, particularly if FIX_VDSO is
near 0xfffff000 ?

-- 
John Reiser, jreiser@xxxxxxxxxxxx
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