Re: [PATCH v7 3/3] x86: Make the GDT remapping read-only on 64-bit

2017-03-14 Thread H. Peter Anvin
,"Luis R . Rodriguez" ,Stanislaw Gruszka ,Peter Zijlstra ,Josh Poimboeuf ,Vitaly Kuznetsov ,Tim Chen ,Joerg Roedel ,TF-8?B?UmFkaW0gS3LEjW3DocWZ?From: h...@zytor.com Message-ID: <550f6209-025a-45e2-84e2-f00a3771c...@zytor.com> On March 14, 2017 2:20:19 PM PDT, Thomas Garnier wrote: >On Tue, M

Re: [PATCH v7 3/3] x86: Make the GDT remapping read-only on 64-bit

2017-03-14 Thread Pavel Machek
On Tue 2017-03-14 10:05:08, Thomas Garnier wrote: > This patch makes the GDT remapped pages read-only to prevent corruption. > This change is done only on 64-bit. > > The native_load_tr_desc function was adapted to correctly handle a > read-only GDT. The LTR instruction always writes to the GDT TS

[PATCH v7 3/3] x86: Make the GDT remapping read-only on 64-bit

2017-03-14 Thread Thomas Garnier
This patch makes the GDT remapped pages read-only to prevent corruption. This change is done only on 64-bit. The native_load_tr_desc function was adapted to correctly handle a read-only GDT. The LTR instruction always writes to the GDT TSS entry. This generates a page fault if the GDT is read-only