On Thu, Jul 30, 2015 at 3:50 PM, Andrew Cooper
wrote:
> On 30/07/2015 22:31, Andy Lutomirski wrote:
>> Note to -stable maintainers: by itself, this patch makes a
>> pre-existing Xen bug much easier to trigger; on a 32-bit Xen guest,
>> the new ldt_gdt selftest is likely to OOPS. Even without this
On 30/07/2015 22:31, Andy Lutomirski wrote:
> Note to -stable maintainers: by itself, this patch makes a
> pre-existing Xen bug much easier to trigger; on a 32-bit Xen guest,
> the new ldt_gdt selftest is likely to OOPS. Even without this
> patch, the test can OOPS, but it's much less likely to ha
modify_ldt has questionable locking and does not synchronize
threads. Improve it: redesign the locking and synchronize all
threads' LDTs using an IPI on all modifications.
This will dramatically slow down modify_ldt in multithreaded
programs, but there shouldn't be any multithreaded programs that
