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Restrict the userfaultfd() syscall to root

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madaidan 2020-02-24 18:23:15 +00:00 • committed by GitHub
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6
etc/sysctl.d/30_security-misc.conf
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@ -133,3 +133,9 @@ kernel.sysrq=132
## ##
## https://lkml.org/lkml/2019/4/15/890 ## https://lkml.org/lkml/2019/4/15/890
dev.tty.ldisc_autoload=0 dev.tty.ldisc_autoload=0
## Restrict the userfaultfd() syscall to root as it can make heap sprays
## easier.
##
## https://duasynt.com/blog/linux-kernel-heap-spray
vm.unprivileged_userfaultfd=0