[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v2 2/7] x86/traps: Poison unused stack pointers in the TSS

>>> On 03.05.17 at 15:29, <andrew.cooper3@xxxxxxxxxx> wrote:
> This is for additional defence-in-depth following LDT/GDT/IDT corruption.
> It causes attempted control transfers to ring 1 or 2 (via a call gate), or
> attempts to use IST 3 through 7 to yield #SS, rather than executing with a
> stack starting at the top of virtual address space.
> Express the TSS setup in terms of structure assignment, which should be less
> fragile if the IST indexes need to change, and has the useful side effect of
> zeroing the reserved fields.
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.