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libstore: Don't default build-dir to temp-dir, store setting

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If a build directory is accessible to other users it is possible to
smuggle data in and out of build directories. Usually this is only
a build purity problem, but in combination with other issues it can
be used to break out of a build sandbox. to prevent this we default
to using a subdirectory of nixStateDir (which is more restrictive).

(cherry picked from pennae Lix commit 55b416f6897fb0d8a9315a530a9b7f0914458ded)
(store setting done by roberth)
This commit is contained in:
eldritch horrors 2025-03-30 16:45:34 +02:00 • committed by Jörg Thalheim
parent 9af4c267c6
commit 88b7db1ba4
11 changed files with 62 additions and 15 deletions
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9
doc/manual/rl-next/build-dir-mandatory.md Normal file
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---
synopsis: "`build-dir` no longer defaults to `$TMPDIR`"
---
The directory in which temporary build directories are created no longer defaults
to `TMPDIR` or `/tmp`, to avoid builders making their directories
world-accessible. This behavior allowed escaping the build sandbox and can
cause build impurities even when not used maliciously. We now default to `builds`
in `NIX_STATE_DIR` (which is `/nix/var/nix/builds` in the default configuration).