/etc/sysctl.d/
/etc/sysctl.d
NameSizeModeActions
10-console-messages.conf770644editdlrm
10-ipv6-privacy.conf4900644editdlrm
10-kernel-hardening.conf12290644editdlrm
10-magic-sysrq.conf11840644editdlrm
10-network-security.conf1580644editdlrm
10-ptrace.conf12920644editdlrm
10-zeropage.conf5060644editdlrm
99-cloudimg-ipv6.conf1850644editdlrm
99-sysctl.conf23550644editdlrm
README.sysctl7980644editdlrm
Edit: /etc/sysctl.d/10-zeropage.conf (506B)
# Protect the zero page of memory from userspace mmap to prevent kernel # NULL-dereference attacks against potential future kernel security # vulnerabilities. (Added in kernel 2.6.23.) # # While this default is built into the Ubuntu kernel, there is no way to # restore the kernel default if the value is changed during runtime; for # example via package removal (e.g. wine, dosemu). Therefore, this value # is reset to the secure default each time the sysctl values are loaded. vm.mmap_min_addr = 65536