mirror of
https://github.com/Kicksecure/security-misc.git
synced 2025-11-26 00:28:28 -05:00
100 lines
3.4 KiB
Bash
Executable file
100 lines
3.4 KiB
Bash
Executable file
#!/bin/bash
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## Copyright (C) 2025 - 2025 ENCRYPTED SUPPORT LLC <adrelanos@whonix.org>
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## See the file COPYING for copying conditions.
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set -o errexit
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set -o nounset
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set -o errtrace
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set -o pipefail
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## Make sure globs sort in a predictable, reproducible fashion
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export LC_ALL=C
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in_dracut='false'
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if [ -f '/dracut-state.sh' ]; then
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in_dracut='true'
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fi
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binary_prefix='/run'
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EMERG_SHUTDOWN_KEYS=''
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root_devices[0]=''
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gcc_hardening_options=(
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"-O2" "-Wall" "-Wextra" "-Wformat" "-Wformat=2" "-Wconversion"
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"-Wimplicit-fallthrough" "-Werror=format-security" "-Werror=implicit"
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"-Werror=int-conversion" "-Werror=incompatible-pointer-types"
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"-Wformat-overflow" "-Wformat-signedness" "-Wnull-dereference" "-Winit-self"
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"-Wmissing-include-dirs" "-Wshift-negative-value" "-Wshift-overflow"
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"-Wswitch-default" "-Wuninitialized" "-Walloca" "-Warray-bounds"
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"-Wfloat-equal" "-Wshadow" "-Wpointer-arith" "-Wundef" "-Wunused-macros"
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"-Wbad-function-cast" "-Wcast-qual" "-Wcast-align" "-Wwrite-strings"
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"-Wdate-time" "-Wstrict-prototypes" "-Wold-style-definition"
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"-Wredundant-decls" "-Winvalid-utf8" "-Wvla" "-Wdisabled-optimization"
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"-Wstack-protector" "-Wdeclaration-after-statement" "-Wtrampolines"
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"-Wbidi-chars=any,ucn" "-Wformat-overflow=2" "-Wformat-truncation=2"
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"-Wshift-overflow=2" "-Wtrivial-auto-var-init" "-Wstringop-overflow=3"
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"-Wstrict-flex-arrays" "-Walloc-zero" "-Warray-bounds=2"
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"-Wattribute-alias=2" "-Wduplicated-branches" "-Wduplicated-cond"
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"-Wcast-align=strict" "-Wjump-misses-init" "-Wlogical-op" "-U_FORTIFY_SOURCE"
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"-D_FORTIFY_SOURCE=3" "-fstack-clash-protection" "-fstack-protector-all"
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"-fno-delete-null-pointer-checks" "-fno-strict-aliasing"
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"-fstrict-flex-arrays=3" "-ftrivial-auto-var-init=pattern" "-fPIE"
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)
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gcc_machine="$(gcc -dumpmachine)"
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if [ "${gcc_machine}" = 'x86_64-linux-gnu' ]; then
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gcc_hardening_options+=( '-fcf-protection=full' )
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elif [ "${gcc_machine}" = 'aarch64-linux-gnu' ]; then
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gcc_hardening_options+=( '-mbranch-protection=standard' )
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fi
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gcc_hardening_options+=(
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"-Wl,-z,nodlopen" "-Wl,-z,noexecstack" "-Wl,-z,relro" "-Wl,-z,now"
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"-Wl,--as-needed" "-Wl,--no-copy-dt-needed-entries" "-pie"
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)
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## Read emergency shutdown key configuration
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for config_file in /etc/security-misc/emerg-shutdown/*.conf /usr/local/etc/security-misc/emerg-shutdown/*.conf; do
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if [ -f "${config_file}" ]; then
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bash -n "${config_file}"
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source "${config_file}"
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fi
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done
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if [ "${in_dracut}" = 'true' ]; then
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binary_prefix=''
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modprobe evdev || {
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printf '%s\n' 'Failed to load evdev driver!'
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exit 1
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}
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## modules may not work immediately after loaded, give them time to
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## initialize
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sleep 0.1
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else
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## Find the devices that make up the root device
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readarray -t root_devices < <(/usr/libexec/helper-scripts/get-backing-devices-for-mountpoint '/') || true;
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## Build the actual emerg-shutdown executable
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if [ ! -f '/run/emerg-shutdown' ]; then
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gcc \
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-g \
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/usr/src/security-misc/emerg-shutdown.c \
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-o \
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/run/emerg-shutdown \
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-static \
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"${gcc_hardening_options[@]}" \
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|| {
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printf "%s\n" 'Could not compile force-shutdown executable!'
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exit 1
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}
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fi
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## memlockd daemonizes itself, so no need to background it.
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memlockd -c /usr/share/security-misc/security-misc-memlockd.cfg || true
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fi
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systemd-notify --ready
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## Launch emerg-shutdown
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IFS=','
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"${binary_prefix}/emerg-shutdown" "--devices=${root_devices[*]}" "--keys=${EMERG_SHUTDOWN_KEYS}"
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