Re: NACK! Re: [PATCH 4/4] Add vsyscalls to feature-removal-schedule.txt

From: Andrew Lutomirski
Date: Fri Aug 12 2011 - 15:14:14 EST

On Fri, Aug 12, 2011 at 2:25 PM, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
> Andy Lutomirski <luto@xxxxxxx> writes:
>> In a couple years, we'll see how well we've done at eradicating vsyscall-using
>> binaries.  Hopefully we can then disable them by default.  We will probably
>> have to leave the option to enable them around forever.

It's already dropped from the version in tip/x86/vdso.

> this would break all old (old = meaning all today's) x86-64 installations.

Somewhat to my surprise, fully up-to-date Fedora 15 seems to work fine
with vsyscall=none, and I wouldn't be terribly surprised if a few of
the distributions starting making it the default sooner or later. I
might do a followup patch to make the switch betweeen vsyscall=emulate
and vsyscall=none work as a sysctl. (Switching from native to emulate
at runtime could be problematic.)

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