Hi! > KAISER makes it harder to defeat KASLR, but makes syscalls and > interrupts slower. These patches are based on work from a team at > Graz University of Technology posted here[1]. The major addition is > support for Intel PCIDs which builds on top of Andy Lutomorski's PCID > work merged for 4.14. PCIDs make KAISER's overhead very reasonable > for a wide variety of use cases.
Is it useful?
> Full Description:
>
> KAISER is a countermeasure against attacks on kernel address
> information. There are at least three existing, published,
> approaches using the shared user/kernel mapping and hardware features
> to defeat KASLR. One approach referenced in the paper locates the
> kernel by observing differences in page fault timing between
> present-but-inaccessable kernel pages and non-present pages.
I mean... evil userspace will still be able to determine kernel's
location using cache aliasing effects, right?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
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