Date: Wed, 20 Apr 2016 15:59:54 -0700 From: Kees Cook <keescook@...gle.com> To: Catalin Marinas <catalin.marinas@....com> Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: ARMv8.0 PAN emulation On Fri, Apr 15, 2016 at 1:58 AM, Catalin Marinas <catalin.marinas@....com> wrote: > Hi Kees, > > On Wed, Apr 13, 2016 at 08:34:31AM -0700, Kees Cook wrote: >> I was curious about where PAN emulation for ARMv8.0 stood? > > I guess the question is with regards to the arm64 kernel port. Yeah, in non-LPAE mode, we're covered by Domains, IIUC. >> You'd mentioned that it might be possible to rework the TTBR0 patch >> to do what's needed. Is there anyone that has cycles to work on it? > > Unfortunately, not. I can put it on our to-do list but the backlog is > pretty large already, so I can't realistically state an ETA. Okay, no worries. I'll add this to my list of "things we need someone to work on". :) >> Also, did you ever get an answer about the lowmem boundary? > > No but I looked through the arm32 kernel and couldn't find any > guarantees. IIRC, we used to have such assumption in the past until we > got the TI Keystone platform with RAM being relocated above 4GB (after > the initial boot code). Okay, good to know. -Kees -- Kees Cook Chrome OS & Brillo Security
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