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libstore: ensure that temporary directory is always 0o000 before deletion

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In the case the deletion fails, we should ensure that the temporary
directory cannot be used for nefarious purposes.

Change-Id: I498a2dd0999a74195d13642f44a5de1e69d46120
Signed-off-by: Raito Bezarius <raito@lix.systems>
This commit is contained in:
Raito Bezarius 2025-03-27 12:22:26 +01:00 • committed by Jörg Thalheim
parent 5ec047f348
commit 4ea4813753
1 changed files with 9 additions and 0 deletions
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9
src/libstore/unix/build/derivation-builder.cc
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@ -2093,6 +2093,15 @@ void DerivationBuilderImpl::checkOutputs(const std::map<std::string, ValidPathIn
void DerivationBuilderImpl::deleteTmpDir(bool force)
{
if (topTmpDir != "") {
/* As an extra caution, even in the event of `deletePath` failing to
* cleaning up behind. The `tmpDir` will be chown as if we were to move
* it inside the Nix store.
*
* This hardens against an attack which smuggles a file descriptor
* to make use of the temporary directory.
*/
chmod(topTmpDir.c_str(), 0000);
/* Don't keep temporary directories for builtins because they
might have privileged stuff (like a copy of netrc). */
if (settings.keepFailed && !force && !drv.isBuiltin()) {