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bsdinstall: add knob to set ASLR sysctls

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Reviewed by:	mw
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D28418
This commit is contained in:
Ed Maste 2021-01-29 14:15:28 -05:00
parent fbc57e2df9
commit 020f411255
1 changed files with 18 additions and 0 deletions
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18
usr.sbin/bsdinstall/scripts/hardening
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@ -28,6 +28,20 @@
: ${DIALOG_OK=0}
set_aslr_sysctls()
{
for bit in 32 64; do
if ! sysctl -Nq kern.elf$bit.aslr.enable >/dev/null; then
continue
fi
cat >> $BSDINSTALL_TMPETC/sysctl.conf.hardening <<-EOF
kern.elf$bit.aslr.enable=1
kern.elf$bit.aslr.pie_enable=1
kern.elf$bit.aslr.honor_sbrk=0
EOF
done
}
echo -n > $BSDINSTALL_TMPETC/rc.conf.hardening
echo -n > $BSDINSTALL_TMPETC/sysctl.conf.hardening
echo -n > $BSDINSTALL_TMPBOOT/loader.conf.hardening
@ -48,6 +62,7 @@ FEATURES=$( dialog --backtitle "FreeBSD Installer" \
"8 disable_sendmail" "Disable Sendmail service" ${disable_sendmail:-off} \
"9 secure_console" "Enable console password prompt" ${secure_console:-off} \
"10 disable_ddtrace" "Disallow DTrace destructive-mode" ${disable_ddtrace:-off} \
"11 enable_aslr" "Enable address layout randomization" ${enable_aslr:-off} \
2>&1 1>&3 )
exec 3>&-
@ -86,6 +101,9 @@ for feature in $FEATURES; do
disable_ddtrace)
echo 'security.bsd.allow_destructive_dtrace=0' >> $BSDINSTALL_TMPBOOT/loader.conf.hardening
;;
enable_aslr)
set_aslr_sysctls
;;
esac
done