Eric Windisch 793088ed0a Make /proc, /sys, /dev readonly for readonly containers ...

If a container is read-only, also set /proc, /sys,
& /dev to read-only. This should apply to both privileged and
unprivileged containers.

Note that when /dev is read-only, device files may still be
written to. This change will simply prevent the device paths
from being modified, or performing mknod of new devices within
the /dev path.

Tests are included for all cases. Also adds a test to ensure
that /dev/pts is always mounted read/write, even in the case of a
read-write rootfs. The kernel restricts writes here naturally and
bad things will happen if we mount it ro.

Signed-off-by: Eric Windisch <eric@windisch.us>
Upstream-commit: 5400d8873f730e6099d29af49fe45931665c3b49
Component: engine

2015-07-02 19:08:00 +00:00

components/engine

Make /proc, /sys, /dev readonly for readonly containers

2015-07-02 19:08:00 +00:00

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