Date: Wed, 13 Apr 2016 23:02:38 -0700 From: Kees Cook <keescook@...omium.org> To: Ingo Molnar <mingo@...nel.org> Cc: Ingo Molnar <mingo@...hat.com>, LKML <linux-kernel@...r.kernel.org>, Baoquan He <bhe@...hat.com>, Yinghai Lu <yinghai@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>, Vivek Goyal <vgoyal@...hat.com>, Andy Lutomirski <luto@...nel.org>, lasse.collin@...aani.org, Andrew Morton <akpm@...ux-foundation.org>, Dave Young <dyoung@...hat.com>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: [PATCH v4 00/20] x86, boot: kaslr cleanup and 64bit kaslr support On Wed, Apr 13, 2016 at 7:11 AM, Kees Cook <keescook@...omium.org> wrote: > On Wed, Apr 13, 2016 at 3:19 AM, Ingo Molnar <mingo@...nel.org> wrote: >> >> * Kees Cook <keescook@...omium.org> wrote: >> >>> FWIW, I've also had this tree up in my git branches, and the 0day >>> tester hasn't complained at all about it in the last two weeks. I'd >>> really like to see this in -next to fix the >4G (mainly kexec) issues >>> and get us to feature parity with the arm64 kASLR work (randomized >>> virtual address). So, I've done this and suddenly realized I hadn't boot-tested i386. It doesn't work, unfortunately. (Which I find strange: I'd expect 0day to have noticed...) Baoquan, have you tested this on 32-bit systems? I get a variety of failures. Either it boots okay, it reboots, or I get tons of pte errors like this: [ 0.000000] clearing pte for ram above max_low_pfn: pfn: 37dcc pmd: f9144f7c pmd phys: 39144f7c pte: f9a1b730 pte phys: 39a1b730 Can you confirm? I suspect relocation problems, but ran out of time today to debug it. I have the entire series with cleaned up changelogs and various other refactorings up here now: http://git.kernel.org/cgit/linux/kernel/git/kees/linux.git/log/?h=kaslr/highmem Thanks! -Kees -- Kees Cook Chrome OS & Brillo Security
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