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Using the noexec flag

If you have the /var and /tmp paths mounted with noexec flag and restricted write for /opt, the installation of ESET Server Security for Linux fails with the following error message:

Invalid value of environment variable MODMAPDIR. Modules cannot be loaded.


The commands below are executed in a Terminal window.

1.Create a folder where exec is enabled with the following owner and permission set:

/usr/lib/efs drwxrwxr-x. root eset-efs-daemons

2.Execute the following commands:

# mkdir /usr/lib/efs
# chgrp eset-efs-daemons /usr/lib/efs
# chmod g+w /usr/lib/efs/

3.Replace /opt/eset/lib/modules with symlink:

# rmdir /opt/eset/lib/modules

# ln -s /usr/lib/efs /opt/eset/lib/modules

4.Compile the essential modules:

# /opt/eset/efs/bin/upd --compile-nups

5.Restart the efs service:

# systemctl restart efs


If a normal, unprivileged user runs efs utilities, you can get the same error when the user's home directory is mounted noexec.


a.Either allow others to use /opt/eset/lib/modules:

# chmod o+rwx /opt/eset/lib/modules

b.Or change permissions for linked folder, when used:

# chmod o+rwx /usr/lib/efs

c.Or run utility with specified MODMAPDIR variable, for example:

$ MODMAPDIR=/usr/lib/efs-user/ /opt/eset/efs/bin/lslog -s



The user needs to have permissions rwx in the folder used.