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x86 KASLR base exposed due to lack of entry trampoline (EntryBleed, CVE-2022-4543) #361

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kees opened this issue May 16, 2024 · 0 comments
Open

x86 KASLR base exposed due to lack of entry trampoline (EntryBleed, CVE-2022-4543) #361

kees opened this issue May 16, 2024 · 0 comments
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[ARCH] x86_64 Needed on the 64-bit x86 architecture (ARCH=x86) [Defense] information exposure Provide a defense for an information exposure

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kees commented May 16, 2024 •
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https://www.willsroot.io/2022/12/entrybleed.html

From v4.20 on, after KPTI was implemented, which had a fixed-location syscall entry trampoline, the trampoline was removed. This exposes the actual kernel mapping address via prefetch, etc. We need to restore this trampoline.
@kees kees added [ARCH] x86_64 Needed on the 64-bit x86 architecture (ARCH=x86) [Defense] information exposure Provide a defense for an information exposure labels May 16, 2024
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