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libstore: clean up the build directory properly

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After the fix for CVE-2024-38531, this was only removing the nested
build directory, rather than the top‐level temporary directory.

Fixes: 1d3696f0fb
This commit is contained in:
Emily 2024-07-04 16:19:51 +01:00
parent b01b60f08c
commit 76e4adfaac
2 changed files with 12 additions and 5 deletions
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9
src/libstore/unix/build/local-derivation-goal.cc
View file

@ -503,12 +503,12 @@ void LocalDerivationGoal::startBuilder()
/* Create a temporary directory where the build will take
place. */
tmpDir = createTempDir(settings.buildDir.get().value_or(""), "nix-build-" + std::string(drvPath.name()), false, false, 0700);
topTmpDir = createTempDir(settings.buildDir.get().value_or(""), "nix-build-" + std::string(drvPath.name()), false, false, 0700);
if (useChroot) {
/* If sandboxing is enabled, put the actual TMPDIR underneath
an inaccessible root-owned directory, to prevent outside
access. */
tmpDir = tmpDir + "/build";
tmpDir = topTmpDir + "/build";
createDir(tmpDir, 0700);
}
chownToBuilder(tmpDir);
@ -2980,7 +2980,7 @@ void LocalDerivationGoal::checkOutputs(const std::map<std::string, ValidPathInfo
void LocalDerivationGoal::deleteTmpDir(bool force)
{
if (tmpDir != "") {
if (topTmpDir != "") {
/* Don't keep temporary directories for builtins because they
might have privileged stuff (like a copy of netrc). */
if (settings.keepFailed && !force && !drv->isBuiltin()) {
@ -2988,7 +2988,8 @@ void LocalDerivationGoal::deleteTmpDir(bool force)
chmod(tmpDir.c_str(), 0755);
}
else
deletePath(tmpDir);
deletePath(topTmpDir);
topTmpDir = "";
tmpDir = "";
}
}

8
src/libstore/unix/build/local-derivation-goal.hh
View file

@ -27,10 +27,16 @@ struct LocalDerivationGoal : public DerivationGoal
std::optional<Path> cgroup;
/**
* The temporary directory.
* The temporary directory used for the build.
*/
Path tmpDir;
/**
* The top-level temporary directory. `tmpDir` is either equal to
* or a child of this directory.
*/
Path topTmpDir;
/**
* The path of the temporary directory in the sandbox.
*/