Messages in this thread | | | Date | Tue, 7 Apr 2020 21:38:53 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 4/4] x86,module: Detect CRn and DRn manipulation |
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On Tue, Apr 07, 2020 at 11:55:21AM -0700, Nadav Amit wrote: > > On Apr 7, 2020, at 4:02 AM, Peter Zijlstra <peterz@infradead.org> wrote: > > > > Since we now have infrastructure to analyze module text, disallow > > modules that write to CRn and DRn registers. > > Assuming the kernel is built without CONFIG_PARAVIRT, what is the right way > for out-of-tree modules to write to CRs? Let’s say CR2?
Most of them there is no real justification for ever writing to. CR2 I suppose we can have an exception for given a sane rationale for why you'd need to rewrite the fault address.
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