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SubjectRe: [RFC PATCH 0/7] x86: introduce system calls addess space isolation
On Thu, 25 Apr 2019, Andy Lutomirski wrote:

> The benefit seems to come from making sure that the RET instruction
> actually goes somewhere that's already been faulted in.

Which doesn't seem to be really compatible with things like retpolines or
anyone using FTRACE_WITH_REGS to modify stored instruction pointer.

--
Jiri Kosina
SUSE Labs

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