[release/v1.8.x] Improve path handling in source reconcilers#2055
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Bucket object keys are external input and may contain arbitrary characters. Joining them with the reconciler's working directory through `filepath.Join` applies `filepath.Clean`, which collapses parent-directory segments and can yield a destination outside the working directory. `securejoin.SecureJoin` resolves the key while keeping the result within the working directory, matching the pattern already used elsewhere in the controllers for similar joins (e.g. GitRepository include paths). Assisted-by: claude-code/opus-4.7 Signed-off-by: Hidde Beydals <hidde@hhh.computer> (cherry picked from commit 6d2d86d)
When validating that the paths listed in `spec.sparseCheckout` exist in the cloned working tree, resolve each entry with `securejoin.SecureJoin` instead of `filepath.Join`. `filepath.Join` collapses parent-directory segments via `filepath.Clean`, so a configured path like `../foo` would have been checked against a location outside the working tree, masking a missing entry behind an unrelated filesystem stat. SecureJoin keeps the resolved path inside the working tree, matching the pattern already used for include paths elsewhere in the controller. Assisted-by: claude-code/opus-4.7 Signed-off-by: Hidde Beydals <hidde@hhh.computer> (cherry picked from commit f5fe034)
hiddeco
approved these changes
May 19, 2026
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Automated backport to
release/v1.8.x, triggered by a label in #2054.