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Copy the output of fixed-output derivations before registering them

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It is possible to exfiltrate a file descriptor out of the build sandbox
of FODs, and use it to modify the store path after it has been
registered.
To avoid that issue, don't register the output of the build, but a copy
of it (that will be free of any leaked file descriptor).
This commit is contained in:
Théophane Hufschmitt 2024-02-13 08:28:02 +01:00
parent 9c0be4c156
commit 8c27eb6c1b
1 changed files with 9 additions and 2 deletions
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11
src/libstore/build.cc
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@ -3286,10 +3286,17 @@ void DerivationGoal::registerOutputs()
throw BuildError(format("suspicious ownership or permission on '%1%'; rejecting this build output") % path);
#endif
/* Apply hash rewriting if necessary. */
/* Apply hash rewriting if necessary.
*
* For FODs, we always do the dump-and-restore dance regardless to make
* sure that there's no stale file descriptor pointing to the output
* of the path.
* */
bool rewritten = false;
if (!outputRewrites.empty()) {
if (fixedOutput || !outputRewrites.empty()) {
if (!outputRewrites.empty()) {
printError(format("warning: rewriting hashes in '%1%'; cross fingers") % path);
}
/* Canonicalise first. This ensures that the path we're
rewriting doesn't contain a hard link to /etc/shadow or