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#!/bin/sh
test "$1" = "-h" -o "$1" = "-hh" && {
echo 'afl-system-config by Marc Heuse <mh@mh-sec.de>'
echo
echo $0
echo
echo afl-system-config has no command line options
echo
echo afl-system reconfigures the system to a high performance fuzzing state
echo WARNING: this reduces the security of the system
echo
exit 1
}
DONE=
PLATFORM=`uname -s`
echo This reconfigures the system to have a better fuzzing performance.
if [ '!' "$EUID" = 0 ] && [ '!' `id -u` = 0 ] ; then
echo "Warning: you need to be root to run this!"
# we do not exit as other mechanisms exist that allows to do this than
# being root. let the errors speak for themselves.
fi
if [ "$PLATFORM" = "Linux" ] ; then
{
sysctl -w kernel.core_pattern=core
sysctl -w kernel.randomize_va_space=0
sysctl -w kernel.sched_child_runs_first=1
sysctl -w kernel.sched_autogroup_enabled=1
sysctl -w kernel.sched_migration_cost_ns=50000000
sysctl -w kernel.sched_latency_ns=250000000
echo never > /sys/kernel/mm/transparent_hugepage/enabled
test -e /sys/devices/system/cpu/cpufreq/scaling_governor && echo performance | tee /sys/devices/system/cpu/cpufreq/scaling_governor
test -e /sys/devices/system/cpu/cpufreq/policy0/scaling_governor && echo performance | tee /sys/devices/system/cpu/cpufreq/policy*/scaling_governor
test -e /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor && echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
test -e /sys/devices/system/cpu/intel_pstate/no_turbo && echo 0 > /sys/devices/system/cpu/intel_pstate/no_turbo
test -e /sys/devices/system/cpu/cpufreq/boost && echo 1 > /sys/devices/system/cpu/cpufreq/boost
} > /dev/null
echo Settings applied.
dmesg | egrep -q 'nospectre_v2|spectre_v2=off' || {
echo It is recommended to boot the kernel with lots of security off - if you are running a machine that is in a secured network - so set this:
echo ' /etc/default/grub:GRUB_CMDLINE_LINUX_DEFAULT="ibpb=off ibrs=off kpti=off l1tf=off mds=off mitigations=off no_stf_barrier noibpb noibrs nopcid nopti nospec_store_bypass_disable nospectre_v1 nospectre_v2 pcid=off pti=off spec_store_bypass_disable=off spectre_v2=off stf_barrier=off"'
}
DONE=1
fi
if [ "$PLATFORM" = "FreeBSD" ] ; then
{
sysctl kern.elf32.aslr.enable=0
sysctl kern.elf64.aslr.enable=0
} > /dev/null
echo Settings applied.
echo It is recommended to boot the kernel with lots of security off - if you are running a machine that is in a secured network - so set this:
echo ' sysctl hw.ibrs_disable=1'
echo 'Setting kern.pmap.pg_ps_enabled=0 into /boot/loader.conf might be helpful too.'
DONE=1
fi
if [ "$PLATFORM" = "OpenBSD" ] ; then
echo
echo 'System security features cannot be disabled on OpenBSD.'
DONE=1
fi
if [ "$PLATFORM" = "NetBSD" ] ; then
{
#echo It is recommended to enable unprivileged users to set cpu affinity
#echo to be able to use afl-gotcpu meaningfully.
/sbin/sysctl -w security.models.extensions.user_set_cpu_affinity=1
} > /dev/null
echo Settings applied.
DONE=1
fi
if [ "$PLATFORM" = "Darwin" ] ; then
if [ $(launchctl list 2>/dev/null | grep -q '\.ReportCrash$') ] ; then
echo We unload the default crash reporter here
SL=/System/Library; PL=com.apple.ReportCrash
launchctl unload -w ${SL}/LaunchAgents/${PL}.plist
sudo launchctl unload -w ${SL}/LaunchDaemons/${PL}.Root.plist
echo Settings applied.
else
echo Nothing to do.
fi
DONE=1
fi
test -z "$DONE" && echo Error: Unknown platform: $PLATFORM
test -z "$AFL_TMPDIR" && echo Also use AFL_TMPDIR and point it to a tmpfs for the input file caching
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