nix-super/doc/manual/src/release-notes/rl-1.4.md
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# Release 1.4 (2013-02-26)
This release fixes a security bug in multi-user operation. It was
possible for derivations to cause the mode of files outside of the Nix
store to be changed to 444 (read-only but world-readable) by creating
hard links to those files
([details](https://github.com/NixOS/nix/commit/5526a282b5b44e9296e61e07d7d2626a79141ac4)).
There are also the following improvements:
- New built-in function: `builtins.hashString`.
- Build logs are now stored in `/nix/var/log/nix/drvs/XX/`, where *XX*
is the first two characters of the derivation. This is useful on
machines that keep a lot of build logs (such as Hydra servers).
- The function `corepkgs/fetchurl` can now make the downloaded file
executable. This will allow getting rid of all bootstrap binaries in
the Nixpkgs source tree.
- Language change: The expression `"${./path}
..."` now evaluates to a string instead of a path.