On Wed, Oct 24, 2018 at 11:49:17AM -0700, Andy Lutomirski wrote:
> On Tue, Oct 23, 2018 at 9:32 AM Kirill A. Shutemov
> wrote:
> >
> > modify_ldt(2) leaves old LDT mapped after we switch over to the new one.
> > Memory for the old LDT gets freed and the pages can be re-used.
> >
> > Leaving the ma
On 10/23/18 9:31 AM, Kirill A. Shutemov wrote:
>
> It shouldn't be a particularly hot path anyway.
>
That's putting it mildly.
-hpa
On Tue, Oct 23, 2018 at 9:32 AM Kirill A. Shutemov
wrote:
>
> modify_ldt(2) leaves old LDT mapped after we switch over to the new one.
> Memory for the old LDT gets freed and the pages can be re-used.
>
> Leaving the mapping in place can have security implications. The mapping
> is present in user
The subject line does not parse..
modify_ldt(2) leaves old LDT mapped after we switch over to the new one.
Memory for the old LDT gets freed and the pages can be re-used.
Leaving the mapping in place can have security implications. The mapping
is present in userspace copy of page tables and Meltdown-like attack can
read these free
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