Messages in this thread | | | Date | Wed, 8 Apr 2020 11:13:06 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 4/4] x86,module: Detect CRn and DRn manipulation |
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On Wed, Apr 08, 2020 at 10:51:38AM +0200, Peter Zijlstra wrote: > On Wed, Apr 08, 2020 at 07:58:53AM +0200, Jan Kiszka wrote: > > On 07.04.20 23:48, Steven Rostedt wrote: > > > > Hmm, wont this break jailhouse? > > Breaking it isn't a problem, it's out of tree and it should be fixable. > > > Yes, possibly. We load the hypervisor binary via request_firmware into > > executable memory and then jump into it. So most of the "suspicious" code is > > W.T.H. does the firmware loader have the ability to give executable > memory? We need to kill that too. /me goes find.
AFAICT the firmware loader only provides PAGE_KERNEL_RO, so how do you get it executable?
I'm thinking the patches Christoph has lined up will take care of this.
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