On 04/13/16 at 11:02pm, Kees Cook wrote: > On Wed, Apr 13, 2016 at 7:11 AM, Kees Cook <keesc...@chromium.org> wrote: > > On Wed, Apr 13, 2016 at 3:19 AM, Ingo Molnar <mi...@kernel.org> wrote: > >> > >> * Kees Cook <keesc...@chromium.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.
Sorry, I didn't test i386 either before. I will get a i386 machine and check it now. I know it's very late in your side, you need rest. Will report update if there's any progress. > > 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
