Something more like this then.

if [ ! -f /sys/module/apparmor/parameters/path_max ] ; then
        echo "WARNING: This version of AppArmor does not support changing 
buffer size."
else
        mode=$(stat -c "%a" /sys/module/apparmor/parameters/path_max)
        if (( 8#$mode & 0222 )); then
                buf_max=2048                    #standard x86 page size/2
                old_max=`cat /sys/module/apparmor/parameters/path_max`
                echo $buf_max > /sys/module/apparmor/parameters/path_max
        else
                echo "WARNING: This version of AppArmor does not support 
changing buffer size."
        fi
fi

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https://bugs.launchpad.net/bugs/1692543

Title:
  Regression tests cannot write to apparmor path_max module parameter in
  artful/4.11

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