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e0d2053b87
When a response file is in use, "$*" contains the response file and not the parameters; both the linker and compiler wrappers are updated to use the response-expanded params. The compiler driver likes to pass parameters to the linker via a response file, including -shared. LLD rejects the combination of (-shared -pie), whereas other linkers silently ignore the contradiction: ``` ld.lld: error: -shared and -pie may not be used together ``` This breaks certain configurations using LLD as a linker. Changing `add-hardening.sh` results in a full rebuild. To avoid the rebuild, here is a quick test case which shows the new hardening script allows the link to succeed: ``` { pkgs ? import <nixpkgs> {} }: let # gcc silently accepts -shared -pie together, lld does not. linker = pkgs.wrapBintoolsWith { bintools = pkgs.llvmPackages.lld; }; patchWrapper = prev: prev.overrideAttrs (final: prev: let prevScript = builtins.match (".*(/nix/store/[a-z0-9]+-add-hardening.sh).*") prev.postFixup; in { postFixup = (builtins.replaceStrings prevScript ["${./new-add-hardening.sh}"] prev.postFixup); }); in pkgs.stdenv.mkDerivation { name = "nixpkgs-hardening-bug"; src = pkgs.writeText "src.c" "int main(int argc, char* argv[]) { return 0; }"; NIX_HARDENING_ENABLE = "pie"; unpackPhase = ":"; buildPhase = '' $CC -c -o src.o $src bash -x ${patchWrapper linker}/bin/ld.lld -o $out @${pkgs.writeText "responsefile" "-shared"} src.o ''; } ``` Fixes: #178162 Signed-off-by: Peter Waller <p@pwaller.net>
63 lines
1.9 KiB
Bash
63 lines
1.9 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 [[ ! (" ${params[*]} " =~ " -shared " \
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|| " ${params[*]} " =~ " -static " \
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|| " ${params[*]} " =~ " -r " \
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|| " ${params[*]} " =~ " -Ur " \
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|| " ${params[*]} " =~ " -i ") ]]; then
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if (( "${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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