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Date: Wed, 31 Jul 2019 18:47:55 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: vdso clock_gettime and time64
* Rich Felker <dalias@...c.org> [2019-07-31 11:07:25 -0400]:
> Thinking about it more, I'm actually concerned about how vdso can
> possibly work at all with checkpoint/resume functionality. The code in
> the vdso has to match the running kernel (which will update the data
> it reads), but the suspended task could be in the middle of vdso code,
> and even if not it's already bound the function entry point addresses
> and knowledge of which ones exist. We probably need the answer to this
> to know if there's even a meaningful problem to solve here. (And if
> this somehow isn't a question with a known answer already, someone's
> going to have a really bad day...)
even if the vdso is the same, criu has issues because
the time is different at restore, so there is a time
namespace proposal to address this
https://marc.info/?l=linux-api&m=156443756221829&w=2
https://www.linuxplumbersconf.org/event/2/contributions/202/attachments/25/28/LPC2018__Time_Namespace_4.pdf
if the kernel version is different then i doubt criu
can be reliable anyway.
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