nicer output for afl-system-config
MODIFY
afl-system-config
afl-system-config
#!/bin/sh
test "$1" = "-h" && {
- echo afl-system-config by Marc Heuse
+ echo 'afl-system-config by Marc Heuse <mh@mh-sec.de>'
echo
echo $0
echo
@@ -12,13 +12,16 @@ test "$1" = "-h" && {
exit 1
}
+DONE=
PLATFORM=`uname -s`
-echo This reconfigures the system to have a better fuzzing performance
+echo This reconfigures the system to have a better fuzzing performance.
if [ '!' "$EUID" = 0 ] && [ '!' `id -u` = 0 ] ; then
- echo Error you need to be root to run this
- exit 1
+ 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 [ "$PLATFORM" = "Linux" ] ; then
+{
sysctl -w kernel.core_pattern=core
sysctl -w kernel.randomize_va_space=0
sysctl -w kernel.sched_child_runs_first=1
@@ -31,28 +34,38 @@ test -e /sys/devices/system/cpu/cpufreq/policy0/scaling_governor && echo perform
test -e /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor && echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
test -e /sys/devices/system/cpu/intel_pstate/no_turbo && echo 0 > /sys/devices/system/cpu/intel_pstate/no_turbo
test -e /sys/devices/system/cpu/cpufreq/boost && echo 1 > /sys/devices/system/cpu/cpufreq/boost
-echo
+} > /dev/null
+ echo Settings applied.
+ dmesg | egrep -q 'nospectre_v2|spectre_v2=off' || {
echo It is recommended to boot the kernel with lots of security off - if you are running a machine that is in a secured network - so set this:
echo ' /etc/default/grub:GRUB_CMDLINE_LINUX_DEFAULT="ibpb=off ibrs=off kpti=off l1tf=off mds=off mitigations=off no_stf_barrier noibpb noibrs nopcid nopti nospec_store_bypass_disable nospectre_v1 nospectre_v2 pcid=off pti=off spec_store_bypass_disable=off spectre_v2=off stf_barrier=off"'
+ }
+ DONE=1
fi
if [ "$PLATFORM" = "FreeBSD" ] ; then
+{
sysctl kern.elf32.aslr.enable=0
sysctl kern.elf64.aslr.enable=0
-echo
+} > /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
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
-echo It is recommended to enable unprivileged users to set cpu affinity
-echo to be able to use afl-gotcpu meaningfully.
+{
+ #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
@@ -60,7 +73,11 @@ 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
-echo
-echo Also use AFL_TMPDIR to use a tmpfs for the input file
+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

nicer output for afl-system-config