Re: [PATCH v12 8/8] x86: Disallow vsyscall emulation when CET is enabled

From: Pavel Machek
Date: Fri Sep 18 2020 - 17:00:31 EST

On Fri 2020-09-18 12:32:57, Dave Hansen wrote:
> On 9/18/20 12:23 PM, Yu-cheng Yu wrote:
> > Emulation of the legacy vsyscall page is required by some programs
> > built before 2013. Newer programs after 2013 don't use it.
> > Disable vsyscall emulation when Control-flow Enforcement (CET) is
> > enabled to enhance security.
> How does this "enhance security"?
> What is the connection between vsyscall emulation and CET?


We don't break compatibility by default, and you should not tell
people to enable CET by default if you plan to do this.

Best regards,

(cesky, pictures)

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