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build-support: Use response-expanded params in pie test

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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>
This commit is contained in:
Peter Waller 2023-06-23 10:46:49 +01:00
parent c311c7c5cc
commit e0d2053b87
2 changed files with 6 additions and 6 deletions
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10
pkgs/build-support/bintools-wrapper/add-hardening.sh
View File

@ -37,11 +37,11 @@ fi
for flag in "${!hardeningEnableMap[@]}"; do
case $flag in
pie)
if [[ ! (" $* " =~ " -shared " \
|| " $* " =~ " -static " \
|| " $* " =~ " -r " \
|| " $* " =~ " -Ur " \
|| " $* " =~ " -i ") ]]; then
if [[ ! (" ${params[*]} " =~ " -shared " \
|| " ${params[*]} " =~ " -static " \
|| " ${params[*]} " =~ " -r " \
|| " ${params[*]} " =~ " -Ur " \
|| " ${params[*]} " =~ " -i ") ]]; then
if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling LDFlags -pie >&2; fi
hardeningLDFlags+=('-pie')
fi

2
pkgs/build-support/cc-wrapper/add-hardening.sh
View File

@ -71,7 +71,7 @@ for flag in "${!hardeningEnableMap[@]}"; do
# NB: we do not use `+=` here, because PIE flags must occur before any PIC flags
if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling CFlags -fPIE >&2; fi
hardeningCFlags=('-fPIE' "${hardeningCFlags[@]}")
if [[ ! (" $* " =~ " -shared " || " $* " =~ " -static ") ]]; then
if [[ ! (" ${params[*]} " =~ " -shared " || " ${params[*]} " =~ " -static ") ]]; then
if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling LDFlags -pie >&2; fi
hardeningCFlags=('-pie' "${hardeningCFlags[@]}")
fi