Public bug reported:
The Debian version of udev ships with the rule
KERNEL=="rdma_cm", GROUP="rdma"
in /etc/udev/rules.d/020_permissions.rules. This means that loading the
rdma_ucm module results in a device file like
crw-rw---- 1 root rdma 10, 60 2008-08-08 14:39
/dev/infiniband/rdma_cm
That is, the rdma_cm file is owned by group rdma, which means that
ordinary users can be given permission to use the RDMA CM by adding them
to the group "rdma". (The rdma_ucm kernel driver is designed so that
this file is safe for ordinary users to access)
Ubuntu does not include this group ownership rule, due to a different
policy about what rules are shipped as part of the udev package; the
policy is that the group ownership rule should be in the package that
uses the file, in this case librdmacm1.
This means that on Ubuntu systems, the device files end up as
crw-rw---- 1 root root 10, 59 2008-08-08 14:33 rdma_cm
and only root can use the RDMA CM.
** Affects: librdmacm (Ubuntu)
Importance: Undecided
Status: New
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Ubuntu is missing /dev/infiniband/rdma_cm group ownership udev rule
https://bugs.launchpad.net/bugs/256216
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