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nix/doc/manual/rl-next/build-dir-mandatory.md
eldritch horrors 88b7db1ba4 libstore: Don't default build-dir to temp-dir, store setting 
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)
2025-06-22 16:49:44 +02:00

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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).