f5074933b7
* bintools: disable -pie when -r or -Ur are used ld’s -r allows you to partially link object files. When -pie is passed with -r, though, we get: ld: -r and -pie may not be used together Most build systems are intelligent enough to pass -no-pie before -r, but we might as well support those that don’t. Note: -pie is not enabled by default in Nixpkgs, but it is when you are using musl. So this solution is really only useful for musl toolchains. * bintools-wrapper: Add incremental -i check for pie
59 lines
1.8 KiB
Bash
59 lines
1.8 KiB
Bash
declare -a hardeningLDFlags=()
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declare -A hardeningEnableMap=()
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# Intentionally word-split in case 'NIX_HARDENING_ENABLE' is defined in Nix. The
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# array expansion also prevents undefined variables from causing trouble with
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# `set -u`.
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for flag in ${NIX_HARDENING_ENABLE_@suffixSalt@-}; do
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hardeningEnableMap["$flag"]=1
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done
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# Remove unsupported flags.
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for flag in @hardening_unsupported_flags@; do
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unset -v "hardeningEnableMap[$flag]"
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done
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if (( "${NIX_DEBUG:-0}" >= 1 )); then
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declare -a allHardeningFlags=(pie relro bindnow)
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declare -A hardeningDisableMap=()
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# Determine which flags were effectively disabled so we can report below.
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for flag in "${allHardeningFlags[@]}"; do
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if [[ -z "${hardeningEnableMap[$flag]-}" ]]; then
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hardeningDisableMap[$flag]=1
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fi
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done
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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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if (( "${#hardeningEnableMap[@]}" )); then
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echo 'HARDENING: Is active (not completely disabled with "all" flag)' >&2;
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fi
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fi
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for flag in "${!hardeningEnableMap[@]}"; do
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case $flag in
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pie)
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if [[ ! ("$*" =~ " -shared " || "$*" =~ " -static " || "$*" =~ " -r " || "$*" =~ " -Ur " || "$*" =~ " -i ") ]]; then
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if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling LDFlags -pie >&2; fi
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hardeningLDFlags+=('-pie')
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fi
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;;
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relro)
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if (( "${NIX_DEBUG:-0}" >= 1 )); 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 (( "${NIX_DEBUG:-0}" >= 1 )); 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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# Ignore unsupported. Checked in Nix that at least *some*
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# tool supports each flag.
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;;
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esac
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done
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