New mounts of /proc or /sys in usernamespaces are blocked unless unmasked
Issue
- After updating to RHEL 7.5 the kernel blocks any new mounts of
/proc
or/sys
within an unprivelaged Docker container with usernamespaces enabled.
Environment
- Red Hat Enterprise Linux 7.5+
- Docker
- namespace.unpriv_enable=1
- kernel-3.10.0-862.6.3.el7
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