2016-03-09 11:46 GMT+01:00 Miklos Szeredi <miklos@xxxxxxxxxx>: > On Wed, Jan 13, 2016 at 11:09 PM, Robert Święcki <robert@xxxxxxxxxxx> wrote: >> Also, text/plain for the list >> >> Hi, there seems to be a bug in the overlay which causes a general page fault. >> >> To replicate I used https://github.com/google/nsjail >> >> I used kernel >> >> $ uname -a >> Linux jag 4.3.0-5-generic #16-Ubuntu SMP Wed Dec 16 23:33:25 UTC 2015 >> x86_64 x86_64 x86_64 GNU/Linux >> >> $ ./nsjail -T /tmp -Mo --chroot /chroot/ --user 0 --group 0 >> --keep_caps -- /bin/sh -i >> / # mkdir /tmp/h >> / # mkdir /tmp/h/w >> / # mkdir /tmp/h/u >> / # mkdir /tmp/h/o >> / # mount -t overlayfs -o >> lowerdir=/bin,upperdir=/tmp/h/u,workdir=/tmp/h/w overlay /tmp/h/o >> / # cd /tmp/h/o >> /tmp/h/o # mv sh uuuuu >> Killed >> >> in dmesg >> >> [176111.038478] overlayfs: ERROR - failed to whiteout '#ffff880004d9ff00' > > This seems to be a modified kernel. > > Was anything else changed? Hi, With: Linux jag 4.4.0-10-generic #25-Ubuntu SMP Wed Mar 2 14:55:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux It now doesn't induce oops $ ./nsjail -T /tmp -Mo --chroot /chroot/ --user 0 --group 0 --keep_caps -- /bin/sh -i / # mkdir /tmp/h / # mkdir /tmp/h/w / # mkdir /tmp/h/u / # mkdir /tmp/h/o / # mount -t overlayfs -o lowerdir=/bin,upperdir=/tmp/h/u,workdir=/tmp/h/w overlay /tmp/h/o / # cd /tmp/h/o /tmp/h/o # mv sh uuuuu mv: can't rename 'sh': Value too large for defined data type / # -- Robert Święcki -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
