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While in user mode, the kernel's code and data remains out of sight but present in the process's page tables.
At best, the vulnerability could be leveraged by malware and hackers to more easily exploit other security bugs.
At worst, the hole could be abused by programs and logged-in users to read the contents of the kernel's memory. The kernel's memory space is hidden from user processes and programs because it may contain all sorts of secrets, such as passwords, login keys, files cached from disk, and so on.
To make the transition from user mode to kernel mode and back to user mode as fast and efficient as possible, the kernel is present in all processes' virtual memory address spaces, although it is invisible to these programs.
When the kernel is needed, the program makes a system call, the processor switches to kernel mode and enters the kernel.
Crucially, these updates to both Linux and Windows will incur a performance hit on Intel products.
The effects are still being benchmarked, however we're looking at a ballpark figure of five to 30 per cent slow down, depending on the task and the processor model.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.Details of the vulnerability within Intel's silicon are under wraps: an embargo on the specifics is due to lift early this month, perhaps in time for Microsoft's Patch Tuesday next week.Indeed, patches for the Linux kernel are available for all to see but comments in the source code have been redacted to obfuscate the issue.Remember, 100% of your purchase fuels the fight for LGBTQ equality and makes you an active member of the Human Rights Campaign.