The entries added to /etc/security/limits.conf

*               hard    nofile          65535
*               soft    nofile          8196
*               hard    nproc           256
*               soft    nproc           128
*               hard    data            8388608
*               soft    data            4194304

have the following effects:

• 65535 maximum number of open files (hard limit).
• 8196 maximum number of open files (soft limit).
• 256 open processes for any user (hard limit).
• 128 open processes for any user (soft limit).
• 8388608 allocated memory in KB (hard limit).
• 4194304 allocated memory in KB (soft limit).

Add:

* hard core 0

to /etc/security/limits.conf

This can be done with the sysctl option:

fs.suid_dumpable = 0