update afl-system-config
MODIFY
afl-system-config
afl-system-config
@@ -7,7 +7,7 @@ test "$1" = "-h" -o "$1" = "-hh" && {
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 "WARNING: this reduces the security of the system!"
echo
exit 1
}
@@ -15,11 +15,14 @@ test "$1" = "-h" -o "$1" = "-hh" && {
DONE=
PLATFORM=`uname -s`
echo This reconfigures the system to have a better fuzzing performance.
+echo "WARNING: this reduces the security of the system!"
+echo
if [ '!' "$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
+sleep 1
if [ "$PLATFORM" = "Linux" ] ; then
{
sysctl -w kernel.core_uses_pid=0
@@ -38,12 +41,17 @@ if [ "$PLATFORM" = "Linux" ] ; then
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
test -e /sys/devices/system/cpu/intel_pstate/max_perf_pct && echo 100 > /sys/devices/system/cpu/intel_pstate/max_perf_pct
+ test -n "$(which auditctl)" && auditctl -a never,task >/dev/null 2>&1
} > /dev/null
echo Settings applied.
+ echo
dmesg | egrep -q 'nospectre_v2|spectre_v2=off' || {
echo It is recommended to boot the kernel with lots of security off - if you are running a machine that is in a secured network - so set this:
echo ' /etc/default/grub:GRUB_CMDLINE_LINUX_DEFAULT="ibpb=off ibrs=off kpti=0 l1tf=off mds=off mitigations=off no_stf_barrier noibpb noibrs nopcid nopti nospec_store_bypass_disable nospectre_v1 nospectre_v2 pcid=off pti=off spec_store_bypass_disable=off spectre_v2=off stf_barrier=off srbds=off noexec=off noexec32=off tsx=on tsx_async_abort=off arm64.nopauth audit=0 hardened_usercopy=off ssbd=force-off"'
+ echo
}
+ echo If you run fuzzing instances in docker, run them with \"--security-opt seccomp=unconfined\" for more speed
+ echo
DONE=1
fi
if [ "$PLATFORM" = "FreeBSD" ] ; then
@@ -52,6 +60,7 @@ if [ "$PLATFORM" = "FreeBSD" ] ; then
sysctl kern.elf64.aslr.enable=0
} > /dev/null
echo Settings applied.
+ echo
cat <<EOF
In order to suppress core file generation during fuzzing it is recommended to set
me:\\
@@ -61,11 +70,12 @@ EOF
echo It is recommended to boot the kernel with lots of security off - if you are running a machine that is in a secured network - so set this:
echo ' sysctl hw.ibrs_disable=1'
echo 'Setting kern.pmap.pg_ps_enabled=0 into /boot/loader.conf might be helpful too.'
+ echo
DONE=1
fi
if [ "$PLATFORM" = "OpenBSD" ] ; then
- echo
echo 'System security features cannot be disabled on OpenBSD.'
+ echo
DONE=1
fi
if [ "$PLATFORM" = "DragonFly" ] ; then
@@ -77,28 +87,33 @@ me:\\
:coredumpsize=0:
in the ~/.login_conf file for the user used for fuzzing.
EOF
+ echo
DONE=1
fi
if [ "$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.
+ echo
DONE=1
fi
if [ "$PLATFORM" = "Darwin" ] ; then
sysctl kern.sysv.shmmax=8388608
sysctl kern.sysv.shmseg=48
sysctl kern.sysv.shmall=98304
+ echo Settings applied.
+ echo
if [ $(launchctl list 2>/dev/null | grep -q '\.ReportCrash$') ] ; then
- echo We unload the default crash reporter here
+ echo
+ echo Unloading the default crash reporter
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.
+ launchctl unload -w ${SL}/LaunchAgents/${PL}.plist >/dev/null 2>&1
+ sudo launchctl unload -w ${SL}/LaunchDaemons/${PL}.Root.plist >/dev/null 2>&1
+ echo
fi
+ echo It is recommended to disable System Integration Protection for increased performance.
+ echo
DONE=1
fi
if [ "$PLATFORM" = "Haiku" ] ; then
@@ -108,7 +123,7 @@ if [ "$PLATFORM" = "Haiku" ] ; then
[ -r ${SETTINGS} ] && grep -qE "default_action\s+kill" ${SETTINGS} && { echo "Nothing to do"; } || { \
echo We change the debug_server default_action from user to silently kill; \
[ ! -r ${SETTINGS} ] && echo "default_action kill" >${SETTINGS} || { mv ${SETTINGS} s.tmp; sed -e "s/default_action\s\s*user/default_action kill/" s.tmp > ${SETTINGS}; rm s.tmp; }; \
- echo Settings applied.; \
+ echo Settings applied.; echo; \
}
DONE=1
fi

update afl-system-config