On Tue, Apr 10, 2018 at 10:16 AM, Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx> wrote: > Hi, Kees, Paolo et al. > > 10.04.2018 08:53, Kees Cook wrote: >> >> Unfortunately I only had a single hang with no dumps. I haven't been >> able to reproduce it since. :( > > > For your convenience I've prepared a VM that contains a reproducer. Awesome. :) > Under the /root folder there is a reproducer script (reproducer.sh). It does > trivial things like enabling sysrq, opening LUKS device, mounting a volume, > running a background I/O (this is an important part, actually, since I > wasn't able to trigger the issue without the background I/O) and, finally, > running the smartctl in a loop. If you are lucky, within a minute or two > you'll get the first warning followed shortly by subsequent bugs and I/O > stall (htop is pre-installed for your convenience too). Yup! [ 27.729498] Bad or missing usercopy whitelist? Kernel memory exposure attempt detected from SLUB object 'scsi_sense_cache' (offset 76, size 22)! I'll see about booting with my own kernels, etc, and try to narrow this down. :) -Kees -- Kees Cook Pixel Security
