On 03/08/2017 02:36 PM, Kees Cook wrote: > On Wed, Mar 8, 2017 at 2:27 PM, Daniel Borkmann <dan...@iogearbox.net> wrote: >> [ 28.474232] rodata_test: test data was not read only >> [...] > > In my tests so far, I've never been able to get rodata_test to fail > (Qemu 2.5.0, Ubuntu). I'll retry with your .config and see if I can > recheck under Qemu 2.7.1. Do you see these failures on real hardware? > > -Kees >
FWIW, I'm seeing the same issue with qemu 2.6.2 and 2.8.0 on Fedora 24 and rawhide respectively. I also notice that CONFIG_X86_PAE is turned off in the defconfig. If I set CONFIG_HIGHMEM_64G which turns on CONFIG_X86_PAE the problem goes away. I can't tell if this is an indication of magically hiding the TLB problem or if there is an issue with !X86_PAE invalidation. Thanks, Laura