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Description of problem:
The following BZ results in the /dev/shm filesystem being mounted with the incorrect 755 permissions:
https://bugzilla.redhat.com/show_bug.cgi?id=1246217
This has been noted in multiple different Fedora bug reports.
Version-Release number of selected component (if applicable):
dracut-network-033-463.el7.x86_64
How reproducible:
Easily
Steps to Reproduce:
1. yum install fcoe-utils lldpad
2. dracut -f -v -a fcoe
3. reboot and verify /dev/shm permissions
Actual results:
# ls -ld /dev/shm
drwxr-xr-t. 2 root root 60 Dec 15 15:09 /dev/shm
Expected results:
$ ls -ld /dev/shm
drwxrwxrwt. 2 root root 260 Dec 15 15:16 /dev/shm
Additional info:
Created attachment 1232319[details]
Patch to correct the permissions
The underlying issue is due to:
/usr/lib/dracut/modules.d/95fcoe/cleanup-fcoe.sh
#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
if [ -e /var/run/lldpad.pid ]; then
lldpad -k
mkdir -m 0755 -p /run/initramfs/state/dev/shm
cp /dev/shm/lldpad.state /run/initramfs/state/dev/shm/ > /dev/null 2>&1
echo "files /dev/shm/lldpad.state" >> /run/initramfs/rwtab
fi
The above /run/initramfs/state/dev/shm persists across the switchroot as the /dev/shm interface. By issuing the mkdir above as 777, the correct permissions are observed following boot.
That patch is not correct, it will leave a writable directory in /run which could be a security risk. In fedora we now have a fix in initscripts that we don't modify the directory permissions if the directory exists.