aaeeef5b6c
Replaces / Closes #353131 A while ago `postgresql` switched to using structured attrs[1]. In the PR it was reported that this made postgresql notably slower when importing SQL dumps[2]. After a bit of debugging it turned out that the hardening was entirely missing and the following combination of settings was the culprit: hardeningEnable = [ "pie" ]; __structuredAttrs = true; I.e. the combination of custom hardening settings and structured attrs. What happened here is that internally the default and enabled hardening flags get written into `NIX_HARDENING_ENABLE`. However, the value is a list and the setting is not in the `env` section. This means that in the structured-attrs case we get something like declare -ax NIX_HARDENING_ENABLE=([0]="bindnow" [1]="format" [2]="fortify" [3]="fortify3" [4]="pic" [5]="relro" [6]="stackprotector" [7]="strictoverflow" [8]="zerocallusedregs" [9]="pie") i.e. an actual array rather than a string with all hardening flags being space-separated which is what the hardening code of the cc-wrapper expects[3]. This only happens if `hardeningEnable` or `hardeningDisable` are explicitly set by a derivation: if none of those are set, `NIX_HARDENING_ENABLE` won't be set by `stdenv.mkDerivation` and the default hardening flags are configured by the setup hook of the cc-wrapper[4]. In other words, this _only_ applies to derivations that have both custom hardening settings _and_ `__structuredAttrs = true;`. All values of `NIX_HARDENING_ENABLE` are well-known, so we don't have to worry about escaping issues. Just forcing it to a string by concatenating the list everytime solves the issue without additional issues like eval errors when inheriting `env` from a structuredAttrs derivation[5]. The price we're paying is a full rebuild. [1] https://github.com/NixOS/nixpkgs/pull/294504 [2] https://github.com/NixOS/nixpkgs/pull/294504#issuecomment-2451482522 [3] |
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Nixpkgs is a collection of over 100,000 software packages that can be installed with the Nix package manager. It also implements NixOS, a purely-functional Linux distribution.
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