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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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tests/functional/build-remote-trustless-should-fail-0.sh
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@ -12,7 +12,6 @@ requiresUnprivilegedUserNamespaces
[[ $busybox =~ busybox ]] || skipTest "no busybox"
unset NIX_STORE_DIR
unset NIX_STATE_DIR
# We first build a dependency of the derivation we eventually want to
# build.