2493454e13
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.
75 lines
2.7 KiB
Bash
75 lines
2.7 KiB
Bash
hardeningFlags=(fortify stackprotector pic strictoverflow format relro bindnow)
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# Intentionally word-split in case 'hardeningEnable' is defined in
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# Nix. Also, our bootstrap tools version of bash is old enough that
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# undefined arrays trip `set -u`.
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if [[ -v hardeningEnable[@] ]]; then
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hardeningFlags+=(${hardeningEnable[@]})
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fi
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hardeningCFlags=()
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hardeningLDFlags=()
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declare -A hardeningDisableMap
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# Intentionally word-split in case 'hardeningDisable' is defined in Nix.
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for flag in ${hardeningDisable[@]:-IGNORED_KEY} @hardening_unsupported_flags@
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do
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hardeningDisableMap[$flag]=1
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done
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if [[ -n "${NIX_DEBUG:-}" ]]; then
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printf 'HARDENING: disabled flags:' >&2
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(( "${#hardeningDisableMap[@]}" )) && printf ' %q' "${!hardeningDisableMap[@]}" >&2
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echo >&2
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fi
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if [[ -z "${hardeningDisableMap[all]:-}" ]]; then
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if [[ -n "${NIX_DEBUG:-}" ]]; then
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echo 'HARDENING: Is active (not completely disabled with "all" flag)' >&2;
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fi
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for flag in "${hardeningFlags[@]}"
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do
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if [[ -z "${hardeningDisableMap[$flag]:-}" ]]; then
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case $flag in
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fortify)
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling fortify >&2; fi
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hardeningCFlags+=('-O2' '-D_FORTIFY_SOURCE=2')
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;;
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stackprotector)
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling stackprotector >&2; fi
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hardeningCFlags+=('-fstack-protector-strong' '--param' 'ssp-buffer-size=4')
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;;
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pie)
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling CFlags -fPIE >&2; fi
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hardeningCFlags+=('-fPIE')
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if [[ ! ("$*" =~ " -shared " || "$*" =~ " -static ") ]]; then
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling LDFlags -pie >&2; fi
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hardeningLDFlags+=('-pie')
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fi
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;;
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pic)
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling pic >&2; fi
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hardeningCFlags+=('-fPIC')
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;;
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strictoverflow)
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling strictoverflow >&2; fi
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hardeningCFlags+=('-fno-strict-overflow')
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;;
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format)
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling format >&2; fi
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hardeningCFlags+=('-Wformat' '-Wformat-security' '-Werror=format-security')
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;;
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relro)
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling relro >&2; fi
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hardeningLDFlags+=('-z' 'relro')
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;;
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bindnow)
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if [[ -n "${NIX_DEBUG:-}" ]]; then echo HARDENING: enabling bindnow >&2; fi
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hardeningLDFlags+=('-z' 'now')
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;;
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*)
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echo "Hardening flag unknown: $flag" >&2
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;;
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esac
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fi
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done
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fi
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