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More recent Intel chips have features – such as PCID – to reduce the performance hit. Similar operating systems, such as Apple's 64-bit mac OS, will also need to be updated – the flaw is in the Intel x86-64 hardware, and it appears a microcode update can't address it.

It has to be fixed in software at the OS level, or go buy a new processor without the design blunder.

Programmers are scrambling to overhaul the open-source Linux kernel's virtual memory system.

Meanwhile, Microsoft is expected to publicly introduce the necessary changes to its Windows operating system in an upcoming Patch Tuesday: these changes were seeded to beta testers running fast-ring Windows Insider builds in November and December.

After the celebrations the newlyweds are expected to fly to America to mark their nuptials with a second gathering at the Hamptons, the exclusive seaside enclave two hours from New York where they both own homes.

Final update A fundamental design flaw in Intel's processor chips has forced a significant redesign of the Linux and Windows kernels to defang the chip-level security bug.

Two van loads of flowers, including pastel coloured roses and white hydrangeas, were delivered and bottles of champagne could be seen in a fridge next to the marquee, while more vans delivered furniture including around 100 steel chairs and ten drinks tables with mirrored glass surfaces Returning home: Paul and his new wife Nancy arrive at their north London home following their wedding at Westminster Registrer Office Showing off: Sir Paul Mc Cartney showed off his gold wedding band as he and Nancy headed into the marquee at their London home Workmen carrying tools including a spirit level arrived at the property in a van from the firm Momart, which specialises in transporting fine art.

One said they had been asked to hang paintings, including works by Picasso and some of Sir Paul's own work.

When it is done, the CPU is told to switch back to user mode, and reenter the process.

While in user mode, the kernel's code and data remains out of sight but present in the process's page tables.

These KPTI patches move the kernel into a completely separate address space, so it's not just invisible to a running process, it's not even there at all.

Really, this shouldn't be needed, but clearly there is a flaw in Intel's silicon that allows kernel access protections to be bypassed in some way.

The downside to this separation is that it is relatively expensive, time wise, to keep switching between two separate address spaces for every system call and for every interrupt from the hardware.

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