nixpkgs/pkgs/build-support/cc-wrapper/add-hardening.sh
John Ericson 2493454e13 cc-wrapper: Use set -u throughout
Now is an opportune time to do this, as the infixSalt conversion in
`add-flags.sh` ensures that all the relevant `NIX_*` vars will be
defined even if empty.
2017-08-07 03:05:51 -04:00

75 lines
2.7 KiB
Bash

hardeningFlags=(fortify stackprotector pic strictoverflow format relro bindnow)
# Intentionally word-split in case 'hardeningEnable' is defined in
# Nix. Also, our bootstrap tools version of bash is old enough that
# undefined arrays trip `set -u`.
if [[ -v hardeningEnable[@] ]]; then
hardeningFlags+=(${hardeningEnable[@]})
fi
hardeningCFlags=()
hardeningLDFlags=()
declare -A hardeningDisableMap
# Intentionally word-split in case 'hardeningDisable' is defined in Nix.
for flag in ${hardeningDisable[@]:-IGNORED_KEY} @hardening_unsupported_flags@
do
hardeningDisableMap[$flag]=1
done
if [[ -n "${NIX_DEBUG:-}" ]]; then
printf 'HARDENING: disabled flags:' >&2
(( "${#hardeningDisableMap[@]}" )) && printf ' %q' "${!hardeningDisableMap[@]}" >&2
echo >&2
fi
if [[ -z "${hardeningDisableMap[all]:-}" ]]; then
if [[ -n "${NIX_DEBUG:-}" ]]; then
echo 'HARDENING: Is active (not completely disabled with "all" flag)' >&2;
fi
for flag in "${hardeningFlags[@]}"
do
if [[ -z "${hardeningDisableMap[$flag]:-}" ]]; then
case $flag in
fortify)
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling fortify >&2; fi
hardeningCFlags+=('-O2' '-D_FORTIFY_SOURCE=2')
;;
stackprotector)
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling stackprotector >&2; fi
hardeningCFlags+=('-fstack-protector-strong' '--param' 'ssp-buffer-size=4')
;;
pie)
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling CFlags -fPIE >&2; fi
hardeningCFlags+=('-fPIE')
if [[ ! ("$*" =~ " -shared " || "$*" =~ " -static ") ]]; then
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling LDFlags -pie >&2; fi
hardeningLDFlags+=('-pie')
fi
;;
pic)
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling pic >&2; fi
hardeningCFlags+=('-fPIC')
;;
strictoverflow)
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling strictoverflow >&2; fi
hardeningCFlags+=('-fno-strict-overflow')
;;
format)
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling format >&2; fi
hardeningCFlags+=('-Wformat' '-Wformat-security' '-Werror=format-security')
;;
relro)
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling relro >&2; fi
hardeningLDFlags+=('-z' 'relro')
;;
bindnow)
if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling bindnow >&2; fi
hardeningLDFlags+=('-z' 'now')
;;
*)
echo "Hardening flag unknown: $flag" >&2
;;
esac
fi
done
fi